/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h

Bug Summary

File:	tools/clang/include/clang/Sema/Sema.h
Warning:	line 826, column 7 Passed-by-value struct argument contains uninitialized data (e.g., field: 'SavedInNonInstantiationSFINAEContext')

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaDeclCXX.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-9/lib/clang/9.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-9~svn360410/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include -I /build/llvm-toolchain-snapshot-9~svn360410/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-9~svn360410/build-llvm/include -I /build/llvm-toolchain-snapshot-9~svn360410/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/include/clang/9.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-9/lib/clang/9.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-9~svn360410/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-9~svn360410=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2019-05-11-053245-11877-1 -x c++ /build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp -faddrsig

/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp

→

1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file implements semantic analysis for C++ declarations.
10//
11//===----------------------------------------------------------------------===//

13#include "clang/AST/ASTConsumer.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/ASTLambda.h"
16#include "clang/AST/ASTMutationListener.h"
17#include "clang/AST/CXXInheritance.h"
18#include "clang/AST/CharUnits.h"
19#include "clang/AST/ComparisonCategories.h"
20#include "clang/AST/EvaluatedExprVisitor.h"
21#include "clang/AST/ExprCXX.h"
22#include "clang/AST/RecordLayout.h"
23#include "clang/AST/RecursiveASTVisitor.h"
24#include "clang/AST/StmtVisitor.h"
25#include "clang/AST/TypeLoc.h"
26#include "clang/AST/TypeOrdering.h"
27#include "clang/Basic/PartialDiagnostic.h"
28#include "clang/Basic/TargetInfo.h"
29#include "clang/Lex/LiteralSupport.h"
30#include "clang/Lex/Preprocessor.h"
31#include "clang/Sema/CXXFieldCollector.h"
32#include "clang/Sema/DeclSpec.h"
33#include "clang/Sema/Initialization.h"
34#include "clang/Sema/Lookup.h"
35#include "clang/Sema/ParsedTemplate.h"
36#include "clang/Sema/Scope.h"
37#include "clang/Sema/ScopeInfo.h"
38#include "clang/Sema/SemaInternal.h"
39#include "clang/Sema/Template.h"
40#include "llvm/ADT/STLExtras.h"
41#include "llvm/ADT/SmallString.h"
42#include "llvm/ADT/StringExtras.h"
43#include <map>
44#include <set>

46using namespace clang;

48//===----------------------------------------------------------------------===//
49// CheckDefaultArgumentVisitor
50//===----------------------------------------------------------------------===//

52namespace {
/// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
/// the default argument of a parameter to determine whether it
/// contains any ill-formed subexpressions. For example, this will
/// diagnose the use of local variables or parameters within the
/// default argument expression.
class CheckDefaultArgumentVisitor
  : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
  Expr *DefaultArg;
  Sema *S;

public:
  CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
    : DefaultArg(defarg), S(s) {}

  bool VisitExpr(Expr *Node);
  bool VisitDeclRefExpr(DeclRefExpr *DRE);
  bool VisitCXXThisExpr(CXXThisExpr *ThisE);
  bool VisitLambdaExpr(LambdaExpr *Lambda);
  bool VisitPseudoObjectExpr(PseudoObjectExpr *POE);
};

/// VisitExpr - Visit all of the children of this expression.
bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
  bool IsInvalid = false;
  for (Stmt *SubStmt : Node->children())
    IsInvalid |= Visit(SubStmt);
  return IsInvalid;
}

/// VisitDeclRefExpr - Visit a reference to a declaration, to
/// determine whether this declaration can be used in the default
/// argument expression.
bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
  NamedDecl *Decl = DRE->getDecl();
  if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
    // C++ [dcl.fct.default]p9
    //   Default arguments are evaluated each time the function is
    //   called. The order of evaluation of function arguments is
    //   unspecified. Consequently, parameters of a function shall not
    //   be used in default argument expressions, even if they are not
    //   evaluated. Parameters of a function declared before a default
    //   argument expression are in scope and can hide namespace and
    //   class member names.
    return S->Diag(DRE->getBeginLoc(),
                   diag::err_param_default_argument_references_param)
           << Param->getDeclName() << DefaultArg->getSourceRange();
  } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
    // C++ [dcl.fct.default]p7
    //   Local variables shall not be used in default argument
    //   expressions.
    if (VDecl->isLocalVarDecl())
      return S->Diag(DRE->getBeginLoc(),
                     diag::err_param_default_argument_references_local)
             << VDecl->getDeclName() << DefaultArg->getSourceRange();
  }

  return false;
}

/// VisitCXXThisExpr - Visit a C++ "this" expression.
bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
  // C++ [dcl.fct.default]p8:
  //   The keyword this shall not be used in a default argument of a
  //   member function.
  return S->Diag(ThisE->getBeginLoc(),
                 diag::err_param_default_argument_references_this)
         << ThisE->getSourceRange();
}

bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
  bool Invalid = false;
  for (PseudoObjectExpr::semantics_iterator
         i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) {
    Expr *E = *i;

    // Look through bindings.
    if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
      E = OVE->getSourceExpr();
      assert(E && "pseudo-object binding without source expression?")((E && "pseudo-object binding without source expression?"
) ? static_cast<void> (0) : __assert_fail ("E && \"pseudo-object binding without source expression?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 131, __PRETTY_FUNCTION__));
    }

    Invalid |= Visit(E);
  }
  return Invalid;
}

bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
  // C++11 [expr.lambda.prim]p13:
  //   A lambda-expression appearing in a default argument shall not
  //   implicitly or explicitly capture any entity.
  if (Lambda->capture_begin() == Lambda->capture_end())
    return false;

  return S->Diag(Lambda->getBeginLoc(), diag::err_lambda_capture_default_arg);
}
148}

150void
151Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc,
                                               const CXXMethodDecl *Method) {
// If we have an MSAny spec already, don't bother.
if (!Method || ComputedEST == EST_MSAny)
  return;

const FunctionProtoType *Proto
  = Method->getType()->getAs<FunctionProtoType>();
Proto = Self->ResolveExceptionSpec(CallLoc, Proto);
if (!Proto)
  return;

ExceptionSpecificationType EST = Proto->getExceptionSpecType();

// If we have a throw-all spec at this point, ignore the function.
if (ComputedEST == EST_None)
  return;

if (EST == EST_None && Method->hasAttr<NoThrowAttr>())
  EST = EST_BasicNoexcept;

switch (EST) {
case EST_Unparsed:
case EST_Uninstantiated:
case EST_Unevaluated:
  llvm_unreachable("should not see unresolved exception specs here")::llvm::llvm_unreachable_internal("should not see unresolved exception specs here"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 176);

// If this function can throw any exceptions, make a note of that.
case EST_MSAny:
case EST_None:
  // FIXME: Whichever we see last of MSAny and None determines our result.
  // We should make a consistent, order-independent choice here.
  ClearExceptions();
  ComputedEST = EST;
  return;
case EST_NoexceptFalse:
  ClearExceptions();
  ComputedEST = EST_None;
  return;
// FIXME: If the call to this decl is using any of its default arguments, we
// need to search them for potentially-throwing calls.
// If this function has a basic noexcept, it doesn't affect the outcome.
case EST_BasicNoexcept:
case EST_NoexceptTrue:
  return;
// If we're still at noexcept(true) and there's a throw() callee,
// change to that specification.
case EST_DynamicNone:
  if (ComputedEST == EST_BasicNoexcept)
    ComputedEST = EST_DynamicNone;
  return;
case EST_DependentNoexcept:
  llvm_unreachable(::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 204)
      "should not generate implicit declarations for dependent cases")::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 204);
case EST_Dynamic:
  break;
}
assert(EST == EST_Dynamic && "EST case not considered earlier.")((EST == EST_Dynamic && "EST case not considered earlier."
) ? static_cast<void> (0) : __assert_fail ("EST == EST_Dynamic && \"EST case not considered earlier.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 208, __PRETTY_FUNCTION__));
assert(ComputedEST != EST_None &&((ComputedEST != EST_None && "Shouldn't collect exceptions when throw-all is guaranteed."
) ? static_cast<void> (0) : __assert_fail ("ComputedEST != EST_None && \"Shouldn't collect exceptions when throw-all is guaranteed.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 210, __PRETTY_FUNCTION__))
       "Shouldn't collect exceptions when throw-all is guaranteed.")((ComputedEST != EST_None && "Shouldn't collect exceptions when throw-all is guaranteed."
) ? static_cast<void> (0) : __assert_fail ("ComputedEST != EST_None && \"Shouldn't collect exceptions when throw-all is guaranteed.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 210, __PRETTY_FUNCTION__));
ComputedEST = EST_Dynamic;
// Record the exceptions in this function's exception specification.
for (const auto &E : Proto->exceptions())
  if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second)
    Exceptions.push_back(E);
216}

218void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) {
if (!E || ComputedEST == EST_MSAny)
  return;

// FIXME:
//
// C++0x [except.spec]p14:
//   [An] implicit exception-specification specifies the type-id T if and
// only if T is allowed by the exception-specification of a function directly
// invoked by f's implicit definition; f shall allow all exceptions if any
// function it directly invokes allows all exceptions, and f shall allow no
// exceptions if every function it directly invokes allows no exceptions.
//
// Note in particular that if an implicit exception-specification is generated
// for a function containing a throw-expression, that specification can still
// be noexcept(true).
//
// Note also that 'directly invoked' is not defined in the standard, and there
// is no indication that we should only consider potentially-evaluated calls.
//
// Ultimately we should implement the intent of the standard: the exception
// specification should be the set of exceptions which can be thrown by the
// implicit definition. For now, we assume that any non-nothrow expression can
// throw any exception.

if (Self->canThrow(E))
  ComputedEST = EST_None;
245}

247bool
248Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
                            SourceLocation EqualLoc) {
if (RequireCompleteType(Param->getLocation(), Param->getType(),
                        diag::err_typecheck_decl_incomplete_type)) {
  Param->setInvalidDecl();
  return true;
}

// C++ [dcl.fct.default]p5
//   A default argument expression is implicitly converted (clause
//   4) to the parameter type. The default argument expression has
//   the same semantic constraints as the initializer expression in
//   a declaration of a variable of the parameter type, using the
//   copy-initialization semantics (8.5).
InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
                                                                  Param);
InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
                                                         EqualLoc);
InitializationSequence InitSeq(*this, Entity, Kind, Arg);
ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg);
if (Result.isInvalid())
  return true;
Arg = Result.getAs<Expr>();

CheckCompletedExpr(Arg, EqualLoc);
Arg = MaybeCreateExprWithCleanups(Arg);

// Okay: add the default argument to the parameter
Param->setDefaultArg(Arg);

// We have already instantiated this parameter; provide each of the
// instantiations with the uninstantiated default argument.
UnparsedDefaultArgInstantiationsMap::iterator InstPos
  = UnparsedDefaultArgInstantiations.find(Param);
if (InstPos != UnparsedDefaultArgInstantiations.end()) {
  for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I)
    InstPos->second[I]->setUninstantiatedDefaultArg(Arg);

  // We're done tracking this parameter's instantiations.
  UnparsedDefaultArgInstantiations.erase(InstPos);
}

return false;
291}

293/// ActOnParamDefaultArgument - Check whether the default argument
294/// provided for a function parameter is well-formed. If so, attach it
295/// to the parameter declaration.
296void
297Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc,
                              Expr *DefaultArg) {
if (!param || !DefaultArg)
  return;

ParmVarDecl *Param = cast<ParmVarDecl>(param);
UnparsedDefaultArgLocs.erase(Param);

// Default arguments are only permitted in C++
if (!getLangOpts().CPlusPlus) {
  Diag(EqualLoc, diag::err_param_default_argument)
    << DefaultArg->getSourceRange();
  Param->setInvalidDecl();
  return;
}

// Check for unexpanded parameter packs.
if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) {
  Param->setInvalidDecl();
  return;
}

// C++11 [dcl.fct.default]p3
//   A default argument expression [...] shall not be specified for a
//   parameter pack.
if (Param->isParameterPack()) {
  Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack)
      << DefaultArg->getSourceRange();
  return;
}

// Check that the default argument is well-formed
CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this);
if (DefaultArgChecker.Visit(DefaultArg)) {
  Param->setInvalidDecl();
  return;
}

SetParamDefaultArgument(Param, DefaultArg, EqualLoc);
336}

338/// ActOnParamUnparsedDefaultArgument - We've seen a default
339/// argument for a function parameter, but we can't parse it yet
340/// because we're inside a class definition. Note that this default
341/// argument will be parsed later.
342void Sema::ActOnParamUnparsedDefaultArgument(Decl *param,
                                           SourceLocation EqualLoc,
                                           SourceLocation ArgLoc) {
if (!param)
  return;

ParmVarDecl *Param = cast<ParmVarDecl>(param);
Param->setUnparsedDefaultArg();
UnparsedDefaultArgLocs[Param] = ArgLoc;
351}

353/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
354/// the default argument for the parameter param failed.
355void Sema::ActOnParamDefaultArgumentError(Decl *param,
                                        SourceLocation EqualLoc) {
if (!param)
  return;

ParmVarDecl *Param = cast<ParmVarDecl>(param);
Param->setInvalidDecl();
UnparsedDefaultArgLocs.erase(Param);
Param->setDefaultArg(new(Context)
                     OpaqueValueExpr(EqualLoc,
                                     Param->getType().getNonReferenceType(),
                                     VK_RValue));
367}

369/// CheckExtraCXXDefaultArguments - Check for any extra default
370/// arguments in the declarator, which is not a function declaration
371/// or definition and therefore is not permitted to have default
372/// arguments. This routine should be invoked for every declarator
373/// that is not a function declaration or definition.
374void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
// C++ [dcl.fct.default]p3
//   A default argument expression shall be specified only in the
//   parameter-declaration-clause of a function declaration or in a
//   template-parameter (14.1). It shall not be specified for a
//   parameter pack. If it is specified in a
//   parameter-declaration-clause, it shall not occur within a
//   declarator or abstract-declarator of a parameter-declaration.
bool MightBeFunction = D.isFunctionDeclarationContext();
for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
  DeclaratorChunk &chunk = D.getTypeObject(i);
  if (chunk.Kind == DeclaratorChunk::Function) {
    if (MightBeFunction) {
      // This is a function declaration. It can have default arguments, but
      // keep looking in case its return type is a function type with default
      // arguments.
      MightBeFunction = false;
      continue;
    }
    for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e;
         ++argIdx) {
      ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param);
      if (Param->hasUnparsedDefaultArg()) {
        std::unique_ptr<CachedTokens> Toks =
            std::move(chunk.Fun.Params[argIdx].DefaultArgTokens);
        SourceRange SR;
        if (Toks->size() > 1)
          SR = SourceRange((*Toks)[1].getLocation(),
                           Toks->back().getLocation());
        else
          SR = UnparsedDefaultArgLocs[Param];
        Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
          << SR;
      } else if (Param->getDefaultArg()) {
        Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
          << Param->getDefaultArg()->getSourceRange();
        Param->setDefaultArg(nullptr);
      }
    }
  } else if (chunk.Kind != DeclaratorChunk::Paren) {
    MightBeFunction = false;
  }
}
417}

419static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) {
for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) {
  const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1);
  if (!PVD->hasDefaultArg())
    return false;
  if (!PVD->hasInheritedDefaultArg())
    return true;
}
return false;
428}

430/// MergeCXXFunctionDecl - Merge two declarations of the same C++
431/// function, once we already know that they have the same
432/// type. Subroutine of MergeFunctionDecl. Returns true if there was an
433/// error, false otherwise.
434bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old,
                              Scope *S) {
bool Invalid = false;

// The declaration context corresponding to the scope is the semantic
// parent, unless this is a local function declaration, in which case
// it is that surrounding function.
DeclContext *ScopeDC = New->isLocalExternDecl()
                           ? New->getLexicalDeclContext()
                           : New->getDeclContext();

// Find the previous declaration for the purpose of default arguments.
FunctionDecl *PrevForDefaultArgs = Old;
for (/**/; PrevForDefaultArgs;
     // Don't bother looking back past the latest decl if this is a local
     // extern declaration; nothing else could work.
     PrevForDefaultArgs = New->isLocalExternDecl()
                              ? nullptr
                              : PrevForDefaultArgs->getPreviousDecl()) {
  // Ignore hidden declarations.
  if (!LookupResult::isVisible(*this, PrevForDefaultArgs))
    continue;

  if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) &&
      !New->isCXXClassMember()) {
    // Ignore default arguments of old decl if they are not in
    // the same scope and this is not an out-of-line definition of
    // a member function.
    continue;
  }

  if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) {
    // If only one of these is a local function declaration, then they are
    // declared in different scopes, even though isDeclInScope may think
    // they're in the same scope. (If both are local, the scope check is
    // sufficient, and if neither is local, then they are in the same scope.)
    continue;
  }

  // We found the right previous declaration.
  break;
}

// C++ [dcl.fct.default]p4:
//   For non-template functions, default arguments can be added in
//   later declarations of a function in the same
//   scope. Declarations in different scopes have completely
//   distinct sets of default arguments. That is, declarations in
//   inner scopes do not acquire default arguments from
//   declarations in outer scopes, and vice versa. In a given
//   function declaration, all parameters subsequent to a
//   parameter with a default argument shall have default
//   arguments supplied in this or previous declarations. A
//   default argument shall not be redefined by a later
//   declaration (not even to the same value).
//
// C++ [dcl.fct.default]p6:
//   Except for member functions of class templates, the default arguments
//   in a member function definition that appears outside of the class
//   definition are added to the set of default arguments provided by the
//   member function declaration in the class definition.
for (unsigned p = 0, NumParams = PrevForDefaultArgs
                                     ? PrevForDefaultArgs->getNumParams()
                                     : 0;
     p < NumParams; ++p) {
  ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p);
  ParmVarDecl *NewParam = New->getParamDecl(p);

  bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false;
  bool NewParamHasDfl = NewParam->hasDefaultArg();

  if (OldParamHasDfl && NewParamHasDfl) {
    unsigned DiagDefaultParamID =
      diag::err_param_default_argument_redefinition;

    // MSVC accepts that default parameters be redefined for member functions
    // of template class. The new default parameter's value is ignored.
    Invalid = true;
    if (getLangOpts().MicrosoftExt) {
      CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New);
      if (MD && MD->getParent()->getDescribedClassTemplate()) {
        // Merge the old default argument into the new parameter.
        NewParam->setHasInheritedDefaultArg();
        if (OldParam->hasUninstantiatedDefaultArg())
          NewParam->setUninstantiatedDefaultArg(
                                    OldParam->getUninstantiatedDefaultArg());
        else
          NewParam->setDefaultArg(OldParam->getInit());
        DiagDefaultParamID = diag::ext_param_default_argument_redefinition;
        Invalid = false;
      }
    }

    // FIXME: If we knew where the '=' was, we could easily provide a fix-it
    // hint here. Alternatively, we could walk the type-source information
    // for NewParam to find the last source location in the type... but it
    // isn't worth the effort right now. This is the kind of test case that
    // is hard to get right:
    //   int f(int);
    //   void g(int (*fp)(int) = f);
    //   void g(int (*fp)(int) = &f);
    Diag(NewParam->getLocation(), DiagDefaultParamID)
      << NewParam->getDefaultArgRange();

    // Look for the function declaration where the default argument was
    // actually written, which may be a declaration prior to Old.
    for (auto Older = PrevForDefaultArgs;
         OldParam->hasInheritedDefaultArg(); /**/) {
      Older = Older->getPreviousDecl();
      OldParam = Older->getParamDecl(p);
    }

    Diag(OldParam->getLocation(), diag::note_previous_definition)
      << OldParam->getDefaultArgRange();
  } else if (OldParamHasDfl) {
    // Merge the old default argument into the new parameter unless the new
    // function is a friend declaration in a template class. In the latter
    // case the default arguments will be inherited when the friend
    // declaration will be instantiated.
    if (New->getFriendObjectKind() == Decl::FOK_None ||
        !New->getLexicalDeclContext()->isDependentContext()) {
      // It's important to use getInit() here;  getDefaultArg()
      // strips off any top-level ExprWithCleanups.
      NewParam->setHasInheritedDefaultArg();
      if (OldParam->hasUnparsedDefaultArg())
        NewParam->setUnparsedDefaultArg();
      else if (OldParam->hasUninstantiatedDefaultArg())
        NewParam->setUninstantiatedDefaultArg(
                                     OldParam->getUninstantiatedDefaultArg());
      else
        NewParam->setDefaultArg(OldParam->getInit());
    }
  } else if (NewParamHasDfl) {
    if (New->getDescribedFunctionTemplate()) {
      // Paragraph 4, quoted above, only applies to non-template functions.
      Diag(NewParam->getLocation(),
           diag::err_param_default_argument_template_redecl)
        << NewParam->getDefaultArgRange();
      Diag(PrevForDefaultArgs->getLocation(),
           diag::note_template_prev_declaration)
          << false;
    } else if (New->getTemplateSpecializationKind()
                 != TSK_ImplicitInstantiation &&
               New->getTemplateSpecializationKind() != TSK_Undeclared) {
      // C++ [temp.expr.spec]p21:
      //   Default function arguments shall not be specified in a declaration
      //   or a definition for one of the following explicit specializations:
      //     - the explicit specialization of a function template;
      //     - the explicit specialization of a member function template;
      //     - the explicit specialization of a member function of a class
      //       template where the class template specialization to which the
      //       member function specialization belongs is implicitly
      //       instantiated.
      Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
        << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
        << New->getDeclName()
        << NewParam->getDefaultArgRange();
    } else if (New->getDeclContext()->isDependentContext()) {
      // C++ [dcl.fct.default]p6 (DR217):
      //   Default arguments for a member function of a class template shall
      //   be specified on the initial declaration of the member function
      //   within the class template.
      //
      // Reading the tea leaves a bit in DR217 and its reference to DR205
      // leads me to the conclusion that one cannot add default function
      // arguments for an out-of-line definition of a member function of a
      // dependent type.
      int WhichKind = 2;
      if (CXXRecordDecl *Record
            = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
        if (Record->getDescribedClassTemplate())
          WhichKind = 0;
        else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
          WhichKind = 1;
        else
          WhichKind = 2;
      }

      Diag(NewParam->getLocation(),
           diag::err_param_default_argument_member_template_redecl)
        << WhichKind
        << NewParam->getDefaultArgRange();
    }
  }
}

// DR1344: If a default argument is added outside a class definition and that
// default argument makes the function a special member function, the program
// is ill-formed. This can only happen for constructors.
if (isa<CXXConstructorDecl>(New) &&
    New->getMinRequiredArguments() < Old->getMinRequiredArguments()) {
  CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)),
                   OldSM = getSpecialMember(cast<CXXMethodDecl>(Old));
  if (NewSM != OldSM) {
    ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments());
    assert(NewParam->hasDefaultArg())((NewParam->hasDefaultArg()) ? static_cast<void> (0)
 : __assert_fail ("NewParam->hasDefaultArg()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 629, __PRETTY_FUNCTION__));
    Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special)
      << NewParam->getDefaultArgRange() << NewSM;
    Diag(Old->getLocation(), diag::note_previous_declaration);
  }
}

const FunctionDecl *Def;
// C++11 [dcl.constexpr]p1: If any declaration of a function or function
// template has a constexpr specifier then all its declarations shall
// contain the constexpr specifier.
if (New->isConstexpr() != Old->isConstexpr()) {
  Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch)
    << New << New->isConstexpr();
  Diag(Old->getLocation(), diag::note_previous_declaration);
  Invalid = true;
} else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() &&
           Old->isDefined(Def) &&
           // If a friend function is inlined but does not have 'inline'
           // specifier, it is a definition. Do not report attribute conflict
           // in this case, redefinition will be diagnosed later.
           (New->isInlineSpecified() ||
            New->getFriendObjectKind() == Decl::FOK_None)) {
  // C++11 [dcl.fcn.spec]p4:
  //   If the definition of a function appears in a translation unit before its
  //   first declaration as inline, the program is ill-formed.
  Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New;
  Diag(Def->getLocation(), diag::note_previous_definition);
  Invalid = true;
}

// C++17 [temp.deduct.guide]p3:
//   Two deduction guide declarations in the same translation unit
//   for the same class template shall not have equivalent
//   parameter-declaration-clauses.
if (isa<CXXDeductionGuideDecl>(New) &&
    !New->isFunctionTemplateSpecialization()) {
  Diag(New->getLocation(), diag::err_deduction_guide_redeclared);
  Diag(Old->getLocation(), diag::note_previous_declaration);
}

// C++11 [dcl.fct.default]p4: If a friend declaration specifies a default
// argument expression, that declaration shall be a definition and shall be
// the only declaration of the function or function template in the
// translation unit.
if (Old->getFriendObjectKind() == Decl::FOK_Undeclared &&
    functionDeclHasDefaultArgument(Old)) {
  Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
  Diag(Old->getLocation(), diag::note_previous_declaration);
  Invalid = true;
}

return Invalid;
682}

684NamedDecl *
685Sema::ActOnDecompositionDeclarator(Scope *S, Declarator &D,
                                 MultiTemplateParamsArg TemplateParamLists) {
assert(D.isDecompositionDeclarator())((D.isDecompositionDeclarator()) ? static_cast<void> (0
) : __assert_fail ("D.isDecompositionDeclarator()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 687, __PRETTY_FUNCTION__));
const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator();

// The syntax only allows a decomposition declarator as a simple-declaration,
// a for-range-declaration, or a condition in Clang, but we parse it in more
// cases than that.
if (!D.mayHaveDecompositionDeclarator()) {
  Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context)
    << Decomp.getSourceRange();
  return nullptr;
}

if (!TemplateParamLists.empty()) {
  // FIXME: There's no rule against this, but there are also no rules that
  // would actually make it usable, so we reject it for now.
  Diag(TemplateParamLists.front()->getTemplateLoc(),
       diag::err_decomp_decl_template);
  return nullptr;
}

Diag(Decomp.getLSquareLoc(),
     !getLangOpts().CPlusPlus17
         ? diag::ext_decomp_decl
         : D.getContext() == DeclaratorContext::ConditionContext
               ? diag::ext_decomp_decl_cond
               : diag::warn_cxx14_compat_decomp_decl)
    << Decomp.getSourceRange();

// The semantic context is always just the current context.
DeclContext *const DC = CurContext;

// C++1z [dcl.dcl]/8:
//   The decl-specifier-seq shall contain only the type-specifier auto
//   and cv-qualifiers.
auto &DS = D.getDeclSpec();
{
  SmallVector<StringRef, 8> BadSpecifiers;
  SmallVector<SourceLocation, 8> BadSpecifierLocs;
  if (auto SCS = DS.getStorageClassSpec()) {
    BadSpecifiers.push_back(DeclSpec::getSpecifierName(SCS));
    BadSpecifierLocs.push_back(DS.getStorageClassSpecLoc());
  }
  if (auto TSCS = DS.getThreadStorageClassSpec()) {
    BadSpecifiers.push_back(DeclSpec::getSpecifierName(TSCS));
    BadSpecifierLocs.push_back(DS.getThreadStorageClassSpecLoc());
  }
  if (DS.isConstexprSpecified()) {
    BadSpecifiers.push_back("constexpr");
    BadSpecifierLocs.push_back(DS.getConstexprSpecLoc());
  }
  if (DS.isInlineSpecified()) {
    BadSpecifiers.push_back("inline");
    BadSpecifierLocs.push_back(DS.getInlineSpecLoc());
  }
  if (!BadSpecifiers.empty()) {
    auto &&Err = Diag(BadSpecifierLocs.front(), diag::err_decomp_decl_spec);
    Err << (int)BadSpecifiers.size()
        << llvm::join(BadSpecifiers.begin(), BadSpecifiers.end(), " ");
    // Don't add FixItHints to remove the specifiers; we do still respect
    // them when building the underlying variable.
    for (auto Loc : BadSpecifierLocs)
      Err << SourceRange(Loc, Loc);
  }
  // We can't recover from it being declared as a typedef.
  if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef)
    return nullptr;
}

TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
QualType R = TInfo->getType();

if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
                                    UPPC_DeclarationType))
  D.setInvalidType();

// The syntax only allows a single ref-qualifier prior to the decomposition
// declarator. No other declarator chunks are permitted. Also check the type
// specifier here.
if (DS.getTypeSpecType() != DeclSpec::TST_auto ||
    D.hasGroupingParens() || D.getNumTypeObjects() > 1 ||
    (D.getNumTypeObjects() == 1 &&
     D.getTypeObject(0).Kind != DeclaratorChunk::Reference)) {
  Diag(Decomp.getLSquareLoc(),
       (D.hasGroupingParens() ||
        (D.getNumTypeObjects() &&
         D.getTypeObject(0).Kind == DeclaratorChunk::Paren))
           ? diag::err_decomp_decl_parens
           : diag::err_decomp_decl_type)
      << R;

  // In most cases, there's no actual problem with an explicitly-specified
  // type, but a function type won't work here, and ActOnVariableDeclarator
  // shouldn't be called for such a type.
  if (R->isFunctionType())
    D.setInvalidType();
}

// Build the BindingDecls.
SmallVector<BindingDecl*, 8> Bindings;

// Build the BindingDecls.
for (auto &B : D.getDecompositionDeclarator().bindings()) {
  // Check for name conflicts.
  DeclarationNameInfo NameInfo(B.Name, B.NameLoc);
  LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
                        ForVisibleRedeclaration);
  LookupName(Previous, S,
             /*CreateBuiltins*/DC->getRedeclContext()->isTranslationUnit());

  // It's not permitted to shadow a template parameter name.
  if (Previous.isSingleResult() &&
      Previous.getFoundDecl()->isTemplateParameter()) {
    DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
                                    Previous.getFoundDecl());
    Previous.clear();
  }

  bool ConsiderLinkage = DC->isFunctionOrMethod() &&
                         DS.getStorageClassSpec() == DeclSpec::SCS_extern;
  FilterLookupForScope(Previous, DC, S, ConsiderLinkage,
                       /*AllowInlineNamespace*/false);
  if (!Previous.empty()) {
    auto *Old = Previous.getRepresentativeDecl();
    Diag(B.NameLoc, diag::err_redefinition) << B.Name;
    Diag(Old->getLocation(), diag::note_previous_definition);
  }

  auto *BD = BindingDecl::Create(Context, DC, B.NameLoc, B.Name);
  PushOnScopeChains(BD, S, true);
  Bindings.push_back(BD);
  ParsingInitForAutoVars.insert(BD);
}

// There are no prior lookup results for the variable itself, because it
// is unnamed.
DeclarationNameInfo NameInfo((IdentifierInfo *)nullptr,
                             Decomp.getLSquareLoc());
LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
                      ForVisibleRedeclaration);

// Build the variable that holds the non-decomposed object.
bool AddToScope = true;
NamedDecl *New =
    ActOnVariableDeclarator(S, D, DC, TInfo, Previous,
                            MultiTemplateParamsArg(), AddToScope, Bindings);
if (AddToScope) {
  S->AddDecl(New);
  CurContext->addHiddenDecl(New);
}

if (isInOpenMPDeclareTargetContext())
  checkDeclIsAllowedInOpenMPTarget(nullptr, New);

return New;
841}

843static bool checkSimpleDecomposition(
  Sema &S, ArrayRef<BindingDecl *> Bindings, ValueDecl *Src,
  QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType,
  llvm::function_ref<ExprResult(SourceLocation, Expr *, unsigned)> GetInit) {
if ((int64_t)Bindings.size() != NumElems) {
  S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
      << DecompType << (unsigned)Bindings.size() << NumElems.toString(10)
      << (NumElems < Bindings.size());
  return true;
}

unsigned I = 0;
for (auto *B : Bindings) {
  SourceLocation Loc = B->getLocation();
  ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
  if (E.isInvalid())
    return true;
  E = GetInit(Loc, E.get(), I++);
  if (E.isInvalid())
    return true;
  B->setBinding(ElemType, E.get());
}

return false;
867}

869static bool checkArrayLikeDecomposition(Sema &S,
                                      ArrayRef<BindingDecl *> Bindings,
                                      ValueDecl *Src, QualType DecompType,
                                      const llvm::APSInt &NumElems,
                                      QualType ElemType) {
return checkSimpleDecomposition(
    S, Bindings, Src, DecompType, NumElems, ElemType,
    [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult {
      ExprResult E = S.ActOnIntegerConstant(Loc, I);
      if (E.isInvalid())
        return ExprError();
      return S.CreateBuiltinArraySubscriptExpr(Base, Loc, E.get(), Loc);
    });
882}

884static bool checkArrayDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
                                  ValueDecl *Src, QualType DecompType,
                                  const ConstantArrayType *CAT) {
return checkArrayLikeDecomposition(S, Bindings, Src, DecompType,
                                   llvm::APSInt(CAT->getSize()),
                                   CAT->getElementType());
890}

892static bool checkVectorDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
                                   ValueDecl *Src, QualType DecompType,
                                   const VectorType *VT) {
return checkArrayLikeDecomposition(
    S, Bindings, Src, DecompType, llvm::APSInt::get(VT->getNumElements()),
    S.Context.getQualifiedType(VT->getElementType(),
                               DecompType.getQualifiers()));
899}

901static bool checkComplexDecomposition(Sema &S,
                                    ArrayRef<BindingDecl *> Bindings,
                                    ValueDecl *Src, QualType DecompType,
                                    const ComplexType *CT) {
return checkSimpleDecomposition(
    S, Bindings, Src, DecompType, llvm::APSInt::get(2),
    S.Context.getQualifiedType(CT->getElementType(),
                               DecompType.getQualifiers()),
    [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult {
      return S.CreateBuiltinUnaryOp(Loc, I ? UO_Imag : UO_Real, Base);
    });
912}

914static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy,
                                   TemplateArgumentListInfo &Args) {
SmallString<128> SS;
llvm::raw_svector_ostream OS(SS);
bool First = true;
for (auto &Arg : Args.arguments()) {
  if (!First)
    OS << ", ";
  Arg.getArgument().print(PrintingPolicy, OS);
  First = false;
}
return OS.str();
926}

928static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup,
                                   SourceLocation Loc, StringRef Trait,
                                   TemplateArgumentListInfo &Args,
                                   unsigned DiagID) {
auto DiagnoseMissing = [&] {
  if (DiagID)
    S.Diag(Loc, DiagID) << printTemplateArgs(S.Context.getPrintingPolicy(),
                                             Args);
  return true;
};

// FIXME: Factor out duplication with lookupPromiseType in SemaCoroutine.
NamespaceDecl *Std = S.getStdNamespace();
if (!Std)
  return DiagnoseMissing();

// Look up the trait itself, within namespace std. We can diagnose various
// problems with this lookup even if we've been asked to not diagnose a
// missing specialization, because this can only fail if the user has been
// declaring their own names in namespace std or we don't support the
// standard library implementation in use.
LookupResult Result(S, &S.PP.getIdentifierTable().get(Trait),
                    Loc, Sema::LookupOrdinaryName);
if (!S.LookupQualifiedName(Result, Std))
  return DiagnoseMissing();
if (Result.isAmbiguous())
  return true;

ClassTemplateDecl *TraitTD = Result.getAsSingle<ClassTemplateDecl>();
if (!TraitTD) {
  Result.suppressDiagnostics();
  NamedDecl *Found = *Result.begin();
  S.Diag(Loc, diag::err_std_type_trait_not_class_template) << Trait;
  S.Diag(Found->getLocation(), diag::note_declared_at);
  return true;
}

// Build the template-id.
QualType TraitTy = S.CheckTemplateIdType(TemplateName(TraitTD), Loc, Args);
if (TraitTy.isNull())
  return true;
if (!S.isCompleteType(Loc, TraitTy)) {
  if (DiagID)
    S.RequireCompleteType(
        Loc, TraitTy, DiagID,
        printTemplateArgs(S.Context.getPrintingPolicy(), Args));
  return true;
}

CXXRecordDecl *RD = TraitTy->getAsCXXRecordDecl();
assert(RD && "specialization of class template is not a class?")((RD && "specialization of class template is not a class?"
) ? static_cast<void> (0) : __assert_fail ("RD && \"specialization of class template is not a class?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 978, __PRETTY_FUNCTION__));

// Look up the member of the trait type.
S.LookupQualifiedName(TraitMemberLookup, RD);
return TraitMemberLookup.isAmbiguous();
983}

985static TemplateArgumentLoc
986getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T,
                                 uint64_t I) {
TemplateArgument Arg(S.Context, S.Context.MakeIntValue(I, T), T);
return S.getTrivialTemplateArgumentLoc(Arg, T, Loc);
990}

992static TemplateArgumentLoc
993getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T) {
return S.getTrivialTemplateArgumentLoc(TemplateArgument(T), QualType(), Loc);
995}

997namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; }

999static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T,
                             llvm::APSInt &Size) {
EnterExpressionEvaluationContext ContextRAII(
    S, Sema::ExpressionEvaluationContext::ConstantEvaluated);

DeclarationName Value = S.PP.getIdentifierInfo("value");
LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName);

// Form template argument list for tuple_size<T>.
TemplateArgumentListInfo Args(Loc, Loc);
Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T));

// If there's no tuple_size specialization, it's not tuple-like.
if (lookupStdTypeTraitMember(S, R, Loc, "tuple_size", Args, /*DiagID*/0))
  return IsTupleLike::NotTupleLike;

// If we get this far, we've committed to the tuple interpretation, but
// we can still fail if there actually isn't a usable ::value.

struct ICEDiagnoser : Sema::VerifyICEDiagnoser {
  LookupResult &R;
  TemplateArgumentListInfo &Args;
  ICEDiagnoser(LookupResult &R, TemplateArgumentListInfo &Args)
      : R(R), Args(Args) {}
  void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) {
    S.Diag(Loc, diag::err_decomp_decl_std_tuple_size_not_constant)
        << printTemplateArgs(S.Context.getPrintingPolicy(), Args);
  }
} Diagnoser(R, Args);

if (R.empty()) {
  Diagnoser.diagnoseNotICE(S, Loc, SourceRange());
  return IsTupleLike::Error;
}

ExprResult E =
    S.BuildDeclarationNameExpr(CXXScopeSpec(), R, /*NeedsADL*/false);
if (E.isInvalid())
  return IsTupleLike::Error;

E = S.VerifyIntegerConstantExpression(E.get(), &Size, Diagnoser, false);
if (E.isInvalid())
  return IsTupleLike::Error;

return IsTupleLike::TupleLike;
1044}

1046/// \return std::tuple_element<I, T>::type.
1047static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc,
                                      unsigned I, QualType T) {
// Form template argument list for tuple_element<I, T>.
TemplateArgumentListInfo Args(Loc, Loc);
Args.addArgument(
    getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I));
Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T));

DeclarationName TypeDN = S.PP.getIdentifierInfo("type");
LookupResult R(S, TypeDN, Loc, Sema::LookupOrdinaryName);
if (lookupStdTypeTraitMember(
        S, R, Loc, "tuple_element", Args,
        diag::err_decomp_decl_std_tuple_element_not_specialized))
  return QualType();

auto *TD = R.getAsSingle<TypeDecl>();
if (!TD) {
  R.suppressDiagnostics();
  S.Diag(Loc, diag::err_decomp_decl_std_tuple_element_not_specialized)
    << printTemplateArgs(S.Context.getPrintingPolicy(), Args);
  if (!R.empty())
    S.Diag(R.getRepresentativeDecl()->getLocation(), diag::note_declared_at);
  return QualType();
}

return S.Context.getTypeDeclType(TD);
1073}

1075namespace {
1076struct BindingDiagnosticTrap {
Sema &S;
DiagnosticErrorTrap Trap;
BindingDecl *BD;

BindingDiagnosticTrap(Sema &S, BindingDecl *BD)
    : S(S), Trap(S.Diags), BD(BD) {}
~BindingDiagnosticTrap() {
  if (Trap.hasErrorOccurred())
    S.Diag(BD->getLocation(), diag::note_in_binding_decl_init) << BD;
}
1087};
1088}

1090static bool checkTupleLikeDecomposition(Sema &S,
                                      ArrayRef<BindingDecl *> Bindings,
                                      VarDecl *Src, QualType DecompType,
                                      const llvm::APSInt &TupleSize) {
if ((int64_t)Bindings.size() != TupleSize) {
  S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
      << DecompType << (unsigned)Bindings.size() << TupleSize.toString(10)
      << (TupleSize < Bindings.size());
  return true;
}

if (Bindings.empty())
  return false;

DeclarationName GetDN = S.PP.getIdentifierInfo("get");

// [dcl.decomp]p3:
//   The unqualified-id get is looked up in the scope of E by class member
//   access lookup ...
LookupResult MemberGet(S, GetDN, Src->getLocation(), Sema::LookupMemberName);
bool UseMemberGet = false;
if (S.isCompleteType(Src->getLocation(), DecompType)) {
  if (auto *RD = DecompType->getAsCXXRecordDecl())
    S.LookupQualifiedName(MemberGet, RD);
  if (MemberGet.isAmbiguous())
    return true;
  //   ... and if that finds at least one declaration that is a function
  //   template whose first template parameter is a non-type parameter ...
  for (NamedDecl *D : MemberGet) {
    if (FunctionTemplateDecl *FTD =
            dyn_cast<FunctionTemplateDecl>(D->getUnderlyingDecl())) {
      TemplateParameterList *TPL = FTD->getTemplateParameters();
      if (TPL->size() != 0 &&
          isa<NonTypeTemplateParmDecl>(TPL->getParam(0))) {
        //   ... the initializer is e.get<i>().
        UseMemberGet = true;
        break;
      }
    }
  }
}

unsigned I = 0;
for (auto *B : Bindings) {
  BindingDiagnosticTrap Trap(S, B);
  SourceLocation Loc = B->getLocation();

  ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
  if (E.isInvalid())
    return true;

  //   e is an lvalue if the type of the entity is an lvalue reference and
  //   an xvalue otherwise
  if (!Src->getType()->isLValueReferenceType())
    E = ImplicitCastExpr::Create(S.Context, E.get()->getType(), CK_NoOp,
                                 E.get(), nullptr, VK_XValue);

  TemplateArgumentListInfo Args(Loc, Loc);
  Args.addArgument(
      getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I));

  if (UseMemberGet) {
    //   if [lookup of member get] finds at least one declaration, the
    //   initializer is e.get<i-1>().
    E = S.BuildMemberReferenceExpr(E.get(), DecompType, Loc, false,
                                   CXXScopeSpec(), SourceLocation(), nullptr,
                                   MemberGet, &Args, nullptr);
    if (E.isInvalid())
      return true;

    E = S.BuildCallExpr(nullptr, E.get(), Loc, None, Loc);
  } else {
    //   Otherwise, the initializer is get<i-1>(e), where get is looked up
    //   in the associated namespaces.
    Expr *Get = UnresolvedLookupExpr::Create(
        S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(),
        DeclarationNameInfo(GetDN, Loc), /*RequiresADL*/true, &Args,
        UnresolvedSetIterator(), UnresolvedSetIterator());

    Expr *Arg = E.get();
    E = S.BuildCallExpr(nullptr, Get, Loc, Arg, Loc);
  }
  if (E.isInvalid())
    return true;
  Expr *Init = E.get();

  //   Given the type T designated by std::tuple_element<i - 1, E>::type,
  QualType T = getTupleLikeElementType(S, Loc, I, DecompType);
  if (T.isNull())
    return true;

  //   each vi is a variable of type "reference to T" initialized with the
  //   initializer, where the reference is an lvalue reference if the
  //   initializer is an lvalue and an rvalue reference otherwise
  QualType RefType =
      S.BuildReferenceType(T, E.get()->isLValue(), Loc, B->getDeclName());
  if (RefType.isNull())
    return true;
  auto *RefVD = VarDecl::Create(
      S.Context, Src->getDeclContext(), Loc, Loc,
      B->getDeclName().getAsIdentifierInfo(), RefType,
      S.Context.getTrivialTypeSourceInfo(T, Loc), Src->getStorageClass());
  RefVD->setLexicalDeclContext(Src->getLexicalDeclContext());
  RefVD->setTSCSpec(Src->getTSCSpec());
  RefVD->setImplicit();
  if (Src->isInlineSpecified())
    RefVD->setInlineSpecified();
  RefVD->getLexicalDeclContext()->addHiddenDecl(RefVD);

  InitializedEntity Entity = InitializedEntity::InitializeBinding(RefVD);
  InitializationKind Kind = InitializationKind::CreateCopy(Loc, Loc);
  InitializationSequence Seq(S, Entity, Kind, Init);
  E = Seq.Perform(S, Entity, Kind, Init);
  if (E.isInvalid())
    return true;
  E = S.ActOnFinishFullExpr(E.get(), Loc, /*DiscardedValue*/ false);
  if (E.isInvalid())
    return true;
  RefVD->setInit(E.get());
  RefVD->checkInitIsICE();

  E = S.BuildDeclarationNameExpr(CXXScopeSpec(),
                                 DeclarationNameInfo(B->getDeclName(), Loc),
                                 RefVD);
  if (E.isInvalid())
    return true;

  B->setBinding(T, E.get());
  I++;
}

return false;
1222}

1224/// Find the base class to decompose in a built-in decomposition of a class type.
1225/// This base class search is, unfortunately, not quite like any other that we
1226/// perform anywhere else in C++.
1227static DeclAccessPair findDecomposableBaseClass(Sema &S, SourceLocation Loc,
                                              const CXXRecordDecl *RD,
                                              CXXCastPath &BasePath) {
auto BaseHasFields = [](const CXXBaseSpecifier *Specifier,
                        CXXBasePath &Path) {
  return Specifier->getType()->getAsCXXRecordDecl()->hasDirectFields();
};

const CXXRecordDecl *ClassWithFields = nullptr;
AccessSpecifier AS = AS_public;
if (RD->hasDirectFields())
  // [dcl.decomp]p4:
  //   Otherwise, all of E's non-static data members shall be public direct
  //   members of E ...
  ClassWithFields = RD;
else {
  //   ... or of ...
  CXXBasePaths Paths;
  Paths.setOrigin(const_cast<CXXRecordDecl*>(RD));
  if (!RD->lookupInBases(BaseHasFields, Paths)) {
    // If no classes have fields, just decompose RD itself. (This will work
    // if and only if zero bindings were provided.)
    return DeclAccessPair::make(const_cast<CXXRecordDecl*>(RD), AS_public);
  }

  CXXBasePath *BestPath = nullptr;
  for (auto &P : Paths) {
    if (!BestPath)
      BestPath = &P;
    else if (!S.Context.hasSameType(P.back().Base->getType(),
                                    BestPath->back().Base->getType())) {
      //   ... the same ...
      S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members)
        << false << RD << BestPath->back().Base->getType()
        << P.back().Base->getType();
      return DeclAccessPair();
    } else if (P.Access < BestPath->Access) {
      BestPath = &P;
    }
  }

  //   ... unambiguous ...
  QualType BaseType = BestPath->back().Base->getType();
  if (Paths.isAmbiguous(S.Context.getCanonicalType(BaseType))) {
    S.Diag(Loc, diag::err_decomp_decl_ambiguous_base)
      << RD << BaseType << S.getAmbiguousPathsDisplayString(Paths);
    return DeclAccessPair();
  }

  //   ... [accessible, implied by other rules] base class of E.
  S.CheckBaseClassAccess(Loc, BaseType, S.Context.getRecordType(RD),
                         *BestPath, diag::err_decomp_decl_inaccessible_base);
  AS = BestPath->Access;

  ClassWithFields = BaseType->getAsCXXRecordDecl();
  S.BuildBasePathArray(Paths, BasePath);
}

// The above search did not check whether the selected class itself has base
// classes with fields, so check that now.
CXXBasePaths Paths;
if (ClassWithFields->lookupInBases(BaseHasFields, Paths)) {
  S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members)
    << (ClassWithFields == RD) << RD << ClassWithFields
    << Paths.front().back().Base->getType();
  return DeclAccessPair();
}

return DeclAccessPair::make(const_cast<CXXRecordDecl*>(ClassWithFields), AS);
1296}

1298static bool checkMemberDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
                                   ValueDecl *Src, QualType DecompType,
                                   const CXXRecordDecl *OrigRD) {
if (S.RequireCompleteType(Src->getLocation(), DecompType,
                          diag::err_incomplete_type))
  return true;

CXXCastPath BasePath;
DeclAccessPair BasePair =
    findDecomposableBaseClass(S, Src->getLocation(), OrigRD, BasePath);
const CXXRecordDecl *RD = cast_or_null<CXXRecordDecl>(BasePair.getDecl());
if (!RD)
  return true;
QualType BaseType = S.Context.getQualifiedType(S.Context.getRecordType(RD),
                                               DecompType.getQualifiers());

auto DiagnoseBadNumberOfBindings = [&]() -> bool {
  unsigned NumFields =
      std::count_if(RD->field_begin(), RD->field_end(),
                    [](FieldDecl *FD) { return !FD->isUnnamedBitfield(); });
  assert(Bindings.size() != NumFields)((Bindings.size() != NumFields) ? static_cast<void> (0)
 : __assert_fail ("Bindings.size() != NumFields", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 1318, __PRETTY_FUNCTION__));
  S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
      << DecompType << (unsigned)Bindings.size() << NumFields
      << (NumFields < Bindings.size());
  return true;
};

//   all of E's non-static data members shall be [...] well-formed
//   when named as e.name in the context of the structured binding,
//   E shall not have an anonymous union member, ...
unsigned I = 0;
for (auto *FD : RD->fields()) {
  if (FD->isUnnamedBitfield())
    continue;

  if (FD->isAnonymousStructOrUnion()) {
    S.Diag(Src->getLocation(), diag::err_decomp_decl_anon_union_member)
      << DecompType << FD->getType()->isUnionType();
    S.Diag(FD->getLocation(), diag::note_declared_at);
    return true;
  }

  // We have a real field to bind.
  if (I >= Bindings.size())
    return DiagnoseBadNumberOfBindings();
  auto *B = Bindings[I++];
  SourceLocation Loc = B->getLocation();

  // The field must be accessible in the context of the structured binding.
  // We already checked that the base class is accessible.
  // FIXME: Add 'const' to AccessedEntity's classes so we can remove the
  // const_cast here.
  S.CheckStructuredBindingMemberAccess(
      Loc, const_cast<CXXRecordDecl *>(OrigRD),
      DeclAccessPair::make(FD, CXXRecordDecl::MergeAccess(
                                   BasePair.getAccess(), FD->getAccess())));

  // Initialize the binding to Src.FD.
  ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
  if (E.isInvalid())
    return true;
  E = S.ImpCastExprToType(E.get(), BaseType, CK_UncheckedDerivedToBase,
                          VK_LValue, &BasePath);
  if (E.isInvalid())
    return true;
  E = S.BuildFieldReferenceExpr(E.get(), /*IsArrow*/ false, Loc,
                                CXXScopeSpec(), FD,
                                DeclAccessPair::make(FD, FD->getAccess()),
                                DeclarationNameInfo(FD->getDeclName(), Loc));
  if (E.isInvalid())
    return true;

  // If the type of the member is T, the referenced type is cv T, where cv is
  // the cv-qualification of the decomposition expression.
  //
  // FIXME: We resolve a defect here: if the field is mutable, we do not add
  // 'const' to the type of the field.
  Qualifiers Q = DecompType.getQualifiers();
  if (FD->isMutable())
    Q.removeConst();
  B->setBinding(S.BuildQualifiedType(FD->getType(), Loc, Q), E.get());
}

if (I != Bindings.size())
  return DiagnoseBadNumberOfBindings();

return false;
1385}

1387void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) {
QualType DecompType = DD->getType();

// If the type of the decomposition is dependent, then so is the type of
// each binding.
if (DecompType->isDependentType()) {
  for (auto *B : DD->bindings())
    B->setType(Context.DependentTy);
  return;
}

DecompType = DecompType.getNonReferenceType();
ArrayRef<BindingDecl*> Bindings = DD->bindings();

// C++1z [dcl.decomp]/2:
//   If E is an array type [...]
// As an extension, we also support decomposition of built-in complex and
// vector types.
if (auto *CAT = Context.getAsConstantArrayType(DecompType)) {
  if (checkArrayDecomposition(*this, Bindings, DD, DecompType, CAT))
    DD->setInvalidDecl();
  return;
}
if (auto *VT = DecompType->getAs<VectorType>()) {
  if (checkVectorDecomposition(*this, Bindings, DD, DecompType, VT))
    DD->setInvalidDecl();
  return;
}
if (auto *CT = DecompType->getAs<ComplexType>()) {
  if (checkComplexDecomposition(*this, Bindings, DD, DecompType, CT))
    DD->setInvalidDecl();
  return;
}

// C++1z [dcl.decomp]/3:
//   if the expression std::tuple_size<E>::value is a well-formed integral
//   constant expression, [...]
llvm::APSInt TupleSize(32);
switch (isTupleLike(*this, DD->getLocation(), DecompType, TupleSize)) {
case IsTupleLike::Error:
  DD->setInvalidDecl();
  return;

case IsTupleLike::TupleLike:
  if (checkTupleLikeDecomposition(*this, Bindings, DD, DecompType, TupleSize))
    DD->setInvalidDecl();
  return;

case IsTupleLike::NotTupleLike:
  break;
}

// C++1z [dcl.dcl]/8:
//   [E shall be of array or non-union class type]
CXXRecordDecl *RD = DecompType->getAsCXXRecordDecl();
if (!RD || RD->isUnion()) {
  Diag(DD->getLocation(), diag::err_decomp_decl_unbindable_type)
      << DD << !RD << DecompType;
  DD->setInvalidDecl();
  return;
}

// C++1z [dcl.decomp]/4:
//   all of E's non-static data members shall be [...] direct members of
//   E or of the same unambiguous public base class of E, ...
if (checkMemberDecomposition(*this, Bindings, DD, DecompType, RD))
  DD->setInvalidDecl();
1454}

1456/// Merge the exception specifications of two variable declarations.
1457///
1458/// This is called when there's a redeclaration of a VarDecl. The function
1459/// checks if the redeclaration might have an exception specification and
1460/// validates compatibility and merges the specs if necessary.
1461void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) {
// Shortcut if exceptions are disabled.
if (!getLangOpts().CXXExceptions)
  return;

assert(Context.hasSameType(New->getType(), Old->getType()) &&((Context.hasSameType(New->getType(), Old->getType()) &&
 "Should only be called if types are otherwise the same.") ? static_cast
<void> (0) : __assert_fail ("Context.hasSameType(New->getType(), Old->getType()) && \"Should only be called if types are otherwise the same.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 1467, __PRETTY_FUNCTION__))
       "Should only be called if types are otherwise the same.")((Context.hasSameType(New->getType(), Old->getType()) &&
 "Should only be called if types are otherwise the same.") ? static_cast
<void> (0) : __assert_fail ("Context.hasSameType(New->getType(), Old->getType()) && \"Should only be called if types are otherwise the same.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 1467, __PRETTY_FUNCTION__));

QualType NewType = New->getType();
QualType OldType = Old->getType();

// We're only interested in pointers and references to functions, as well
// as pointers to member functions.
if (const ReferenceType *R = NewType->getAs<ReferenceType>()) {
  NewType = R->getPointeeType();
  OldType = OldType->getAs<ReferenceType>()->getPointeeType();
} else if (const PointerType *P = NewType->getAs<PointerType>()) {
  NewType = P->getPointeeType();
  OldType = OldType->getAs<PointerType>()->getPointeeType();
} else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) {
  NewType = M->getPointeeType();
  OldType = OldType->getAs<MemberPointerType>()->getPointeeType();
}

if (!NewType->isFunctionProtoType())
  return;

// There's lots of special cases for functions. For function pointers, system
// libraries are hopefully not as broken so that we don't need these
// workarounds.
if (CheckEquivalentExceptionSpec(
      OldType->getAs<FunctionProtoType>(), Old->getLocation(),
      NewType->getAs<FunctionProtoType>(), New->getLocation())) {
  New->setInvalidDecl();
}
1496}

1498/// CheckCXXDefaultArguments - Verify that the default arguments for a
1499/// function declaration are well-formed according to C++
1500/// [dcl.fct.default].
1501void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
unsigned NumParams = FD->getNumParams();
unsigned p;

// Find first parameter with a default argument
for (p = 0; p < NumParams; ++p) {
  ParmVarDecl *Param = FD->getParamDecl(p);
  if (Param->hasDefaultArg())
    break;
}

// C++11 [dcl.fct.default]p4:
//   In a given function declaration, each parameter subsequent to a parameter
//   with a default argument shall have a default argument supplied in this or
//   a previous declaration or shall be a function parameter pack. A default
//   argument shall not be redefined by a later declaration (not even to the
//   same value).
unsigned LastMissingDefaultArg = 0;
for (; p < NumParams; ++p) {
  ParmVarDecl *Param = FD->getParamDecl(p);
  if (!Param->hasDefaultArg() && !Param->isParameterPack()) {
    if (Param->isInvalidDecl())
      /* We already complained about this parameter. */;
    else if (Param->getIdentifier())
      Diag(Param->getLocation(),
           diag::err_param_default_argument_missing_name)
        << Param->getIdentifier();
    else
      Diag(Param->getLocation(),
           diag::err_param_default_argument_missing);

    LastMissingDefaultArg = p;
  }
}

if (LastMissingDefaultArg > 0) {
  // Some default arguments were missing. Clear out all of the
  // default arguments up to (and including) the last missing
  // default argument, so that we leave the function parameters
  // in a semantically valid state.
  for (p = 0; p <= LastMissingDefaultArg; ++p) {
    ParmVarDecl *Param = FD->getParamDecl(p);
    if (Param->hasDefaultArg()) {
      Param->setDefaultArg(nullptr);
    }
  }
}
1548}

1550// CheckConstexprParameterTypes - Check whether a function's parameter types
1551// are all literal types. If so, return true. If not, produce a suitable
1552// diagnostic and return false.
1553static bool CheckConstexprParameterTypes(Sema &SemaRef,
                                       const FunctionDecl *FD) {
unsigned ArgIndex = 0;
const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>();
for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(),
                                            e = FT->param_type_end();
     i != e; ++i, ++ArgIndex) {
  const ParmVarDecl *PD = FD->getParamDecl(ArgIndex);
  SourceLocation ParamLoc = PD->getLocation();
  if (!(*i)->isDependentType() &&
      SemaRef.RequireLiteralType(ParamLoc, *i,
                                 diag::err_constexpr_non_literal_param,
                                 ArgIndex+1, PD->getSourceRange(),
                                 isa<CXXConstructorDecl>(FD)))
    return false;
}
return true;
1570}

1572/// Get diagnostic %select index for tag kind for
1573/// record diagnostic message.
1574/// WARNING: Indexes apply to particular diagnostics only!
1575///
1576/// \returns diagnostic %select index.
1577static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) {
switch (Tag) {
case TTK_Struct: return 0;
case TTK_Interface: return 1;
case TTK_Class:  return 2;
default: llvm_unreachable("Invalid tag kind for record diagnostic!")::llvm::llvm_unreachable_internal("Invalid tag kind for record diagnostic!"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 1582);
}
1584}

1586// CheckConstexprFunctionDecl - Check whether a function declaration satisfies
1587// the requirements of a constexpr function definition or a constexpr
1588// constructor definition. If so, return true. If not, produce appropriate
1589// diagnostics and return false.
1590//
1591// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360.
1592bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) {
const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
if (MD && MD->isInstance()) {
  // C++11 [dcl.constexpr]p4:
  //  The definition of a constexpr constructor shall satisfy the following
  //  constraints:
  //  - the class shall not have any virtual base classes;
  const CXXRecordDecl *RD = MD->getParent();
  if (RD->getNumVBases()) {
    Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base)
      << isa<CXXConstructorDecl>(NewFD)
      << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
    for (const auto &I : RD->vbases())
      Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here)
          << I.getSourceRange();
    return false;
  }
}

if (!isa<CXXConstructorDecl>(NewFD)) {
  // C++11 [dcl.constexpr]p3:
  //  The definition of a constexpr function shall satisfy the following
  //  constraints:
  // - it shall not be virtual;
  const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD);
  if (Method && Method->isVirtual()) {
    Method = Method->getCanonicalDecl();
    Diag(Method->getLocation(), diag::err_constexpr_virtual);

    // If it's not obvious why this function is virtual, find an overridden
    // function which uses the 'virtual' keyword.
    const CXXMethodDecl *WrittenVirtual = Method;
    while (!WrittenVirtual->isVirtualAsWritten())
      WrittenVirtual = *WrittenVirtual->begin_overridden_methods();
    if (WrittenVirtual != Method)
      Diag(WrittenVirtual->getLocation(),
           diag::note_overridden_virtual_function);
    return false;
  }

  // - its return type shall be a literal type;
  QualType RT = NewFD->getReturnType();
  if (!RT->isDependentType() &&
      RequireLiteralType(NewFD->getLocation(), RT,
                         diag::err_constexpr_non_literal_return))
    return false;
}

// - each of its parameter types shall be a literal type;
if (!CheckConstexprParameterTypes(*this, NewFD))
  return false;

return true;
1645}

1647/// Check the given declaration statement is legal within a constexpr function
1648/// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3.
1649///
1650/// \return true if the body is OK (maybe only as an extension), false if we
1651///         have diagnosed a problem.
1652static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl,
                                 DeclStmt *DS, SourceLocation &Cxx1yLoc) {
// C++11 [dcl.constexpr]p3 and p4:
//  The definition of a constexpr function(p3) or constructor(p4) [...] shall
//  contain only
for (const auto *DclIt : DS->decls()) {
  switch (DclIt->getKind()) {
  case Decl::StaticAssert:
  case Decl::Using:
  case Decl::UsingShadow:
  case Decl::UsingDirective:
  case Decl::UnresolvedUsingTypename:
  case Decl::UnresolvedUsingValue:
    //   - static_assert-declarations
    //   - using-declarations,
    //   - using-directives,
    continue;

  case Decl::Typedef:
  case Decl::TypeAlias: {
    //   - typedef declarations and alias-declarations that do not define
    //     classes or enumerations,
    const auto *TN = cast<TypedefNameDecl>(DclIt);
    if (TN->getUnderlyingType()->isVariablyModifiedType()) {
      // Don't allow variably-modified types in constexpr functions.
      TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc();
      SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla)
        << TL.getSourceRange() << TL.getType()
        << isa<CXXConstructorDecl>(Dcl);
      return false;
    }
    continue;
  }

  case Decl::Enum:
  case Decl::CXXRecord:
    // C++1y allows types to be defined, not just declared.
    if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition())
      SemaRef.Diag(DS->getBeginLoc(),
                   SemaRef.getLangOpts().CPlusPlus14
                       ? diag::warn_cxx11_compat_constexpr_type_definition
                       : diag::ext_constexpr_type_definition)
          << isa<CXXConstructorDecl>(Dcl);
    continue;

  case Decl::EnumConstant:
  case Decl::IndirectField:
  case Decl::ParmVar:
    // These can only appear with other declarations which are banned in
    // C++11 and permitted in C++1y, so ignore them.
    continue;

  case Decl::Var:
  case Decl::Decomposition: {
    // C++1y [dcl.constexpr]p3 allows anything except:
    //   a definition of a variable of non-literal type or of static or
    //   thread storage duration or for which no initialization is performed.
    const auto *VD = cast<VarDecl>(DclIt);
    if (VD->isThisDeclarationADefinition()) {
      if (VD->isStaticLocal()) {
        SemaRef.Diag(VD->getLocation(),
                     diag::err_constexpr_local_var_static)
          << isa<CXXConstructorDecl>(Dcl)
          << (VD->getTLSKind() == VarDecl::TLS_Dynamic);
        return false;
      }
      if (!VD->getType()->isDependentType() &&
          SemaRef.RequireLiteralType(
            VD->getLocation(), VD->getType(),
            diag::err_constexpr_local_var_non_literal_type,
            isa<CXXConstructorDecl>(Dcl)))
        return false;
      if (!VD->getType()->isDependentType() &&
          !VD->hasInit() && !VD->isCXXForRangeDecl()) {
        SemaRef.Diag(VD->getLocation(),
                     diag::err_constexpr_local_var_no_init)
          << isa<CXXConstructorDecl>(Dcl);
        return false;
      }
    }
    SemaRef.Diag(VD->getLocation(),
                 SemaRef.getLangOpts().CPlusPlus14
                  ? diag::warn_cxx11_compat_constexpr_local_var
                  : diag::ext_constexpr_local_var)
      << isa<CXXConstructorDecl>(Dcl);
    continue;
  }

  case Decl::NamespaceAlias:
  case Decl::Function:
    // These are disallowed in C++11 and permitted in C++1y. Allow them
    // everywhere as an extension.
    if (!Cxx1yLoc.isValid())
      Cxx1yLoc = DS->getBeginLoc();
    continue;

  default:
    SemaRef.Diag(DS->getBeginLoc(), diag::err_constexpr_body_invalid_stmt)
        << isa<CXXConstructorDecl>(Dcl);
    return false;
  }
}

return true;
1756}

1758/// Check that the given field is initialized within a constexpr constructor.
1759///
1760/// \param Dcl The constexpr constructor being checked.
1761/// \param Field The field being checked. This may be a member of an anonymous
1762///        struct or union nested within the class being checked.
1763/// \param Inits All declarations, including anonymous struct/union members and
1764///        indirect members, for which any initialization was provided.
1765/// \param Diagnosed Set to true if an error is produced.
1766static void CheckConstexprCtorInitializer(Sema &SemaRef,
                                        const FunctionDecl *Dcl,
                                        FieldDecl *Field,
                                        llvm::SmallSet<Decl*, 16> &Inits,
                                        bool &Diagnosed) {
if (Field->isInvalidDecl())
  return;

if (Field->isUnnamedBitfield())
  return;

// Anonymous unions with no variant members and empty anonymous structs do not
// need to be explicitly initialized. FIXME: Anonymous structs that contain no
// indirect fields don't need initializing.
if (Field->isAnonymousStructOrUnion() &&
    (Field->getType()->isUnionType()
         ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers()
         : Field->getType()->getAsCXXRecordDecl()->isEmpty()))
  return;

if (!Inits.count(Field)) {
  if (!Diagnosed) {
    SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init);
    Diagnosed = true;
  }
  SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init);
} else if (Field->isAnonymousStructOrUnion()) {
  const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl();
  for (auto *I : RD->fields())
    // If an anonymous union contains an anonymous struct of which any member
    // is initialized, all members must be initialized.
    if (!RD->isUnion() || Inits.count(I))
      CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed);
}
1800}

1802/// Check the provided statement is allowed in a constexpr function
1803/// definition.
1804static bool
1805CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S,
                         SmallVectorImpl<SourceLocation> &ReturnStmts,
                         SourceLocation &Cxx1yLoc, SourceLocation &Cxx2aLoc) {
// - its function-body shall be [...] a compound-statement that contains only
switch (S->getStmtClass()) {
case Stmt::NullStmtClass:
  //   - null statements,
  return true;

case Stmt::DeclStmtClass:
  //   - static_assert-declarations
  //   - using-declarations,
  //   - using-directives,
  //   - typedef declarations and alias-declarations that do not define
  //     classes or enumerations,
  if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc))
    return false;
  return true;

case Stmt::ReturnStmtClass:
  //   - and exactly one return statement;
  if (isa<CXXConstructorDecl>(Dcl)) {
    // C++1y allows return statements in constexpr constructors.
    if (!Cxx1yLoc.isValid())
      Cxx1yLoc = S->getBeginLoc();
    return true;
  }

  ReturnStmts.push_back(S->getBeginLoc());
  return true;

case Stmt::CompoundStmtClass: {
  // C++1y allows compound-statements.
  if (!Cxx1yLoc.isValid())
    Cxx1yLoc = S->getBeginLoc();

  CompoundStmt *CompStmt = cast<CompoundStmt>(S);
  for (auto *BodyIt : CompStmt->body()) {
    if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts,
                                    Cxx1yLoc, Cxx2aLoc))
      return false;
  }
  return true;
}

case Stmt::AttributedStmtClass:
  if (!Cxx1yLoc.isValid())
    Cxx1yLoc = S->getBeginLoc();
  return true;

case Stmt::IfStmtClass: {
  // C++1y allows if-statements.
  if (!Cxx1yLoc.isValid())
    Cxx1yLoc = S->getBeginLoc();

  IfStmt *If = cast<IfStmt>(S);
  if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts,
                                  Cxx1yLoc, Cxx2aLoc))
    return false;
  if (If->getElse() &&
      !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts,
                                  Cxx1yLoc, Cxx2aLoc))
    return false;
  return true;
}

case Stmt::WhileStmtClass:
case Stmt::DoStmtClass:
case Stmt::ForStmtClass:
case Stmt::CXXForRangeStmtClass:
case Stmt::ContinueStmtClass:
  // C++1y allows all of these. We don't allow them as extensions in C++11,
  // because they don't make sense without variable mutation.
  if (!SemaRef.getLangOpts().CPlusPlus14)
    break;
  if (!Cxx1yLoc.isValid())
    Cxx1yLoc = S->getBeginLoc();
  for (Stmt *SubStmt : S->children())
    if (SubStmt &&
        !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
                                    Cxx1yLoc, Cxx2aLoc))
      return false;
  return true;

case Stmt::SwitchStmtClass:
case Stmt::CaseStmtClass:
case Stmt::DefaultStmtClass:
case Stmt::BreakStmtClass:
  // C++1y allows switch-statements, and since they don't need variable
  // mutation, we can reasonably allow them in C++11 as an extension.
  if (!Cxx1yLoc.isValid())
    Cxx1yLoc = S->getBeginLoc();
  for (Stmt *SubStmt : S->children())
    if (SubStmt &&
        !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
                                    Cxx1yLoc, Cxx2aLoc))
      return false;
  return true;

case Stmt::CXXTryStmtClass:
  if (Cxx2aLoc.isInvalid())
    Cxx2aLoc = S->getBeginLoc();
  for (Stmt *SubStmt : S->children()) {
    if (SubStmt &&
        !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
                                    Cxx1yLoc, Cxx2aLoc))
      return false;
  }
  return true;

case Stmt::CXXCatchStmtClass:
  // Do not bother checking the language mode (already covered by the
  // try block check).
  if (!CheckConstexprFunctionStmt(SemaRef, Dcl,
                                  cast<CXXCatchStmt>(S)->getHandlerBlock(),
                                  ReturnStmts, Cxx1yLoc, Cxx2aLoc))
    return false;
  return true;

default:
  if (!isa<Expr>(S))
    break;

  // C++1y allows expression-statements.
  if (!Cxx1yLoc.isValid())
    Cxx1yLoc = S->getBeginLoc();
  return true;
}

SemaRef.Diag(S->getBeginLoc(), diag::err_constexpr_body_invalid_stmt)
    << isa<CXXConstructorDecl>(Dcl);
return false;
1937}

1939/// Check the body for the given constexpr function declaration only contains
1940/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4.
1941///
1942/// \return true if the body is OK, false if we have diagnosed a problem.
1943bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) {
SmallVector<SourceLocation, 4> ReturnStmts;

if (isa<CXXTryStmt>(Body)) {
  // C++11 [dcl.constexpr]p3:
  //  The definition of a constexpr function shall satisfy the following
  //  constraints: [...]
  // - its function-body shall be = delete, = default, or a
  //   compound-statement
  //
  // C++11 [dcl.constexpr]p4:
  //  In the definition of a constexpr constructor, [...]
  // - its function-body shall not be a function-try-block;
  //
  // This restriction is lifted in C++2a, as long as inner statements also
  // apply the general constexpr rules.
  Diag(Body->getBeginLoc(),
       !getLangOpts().CPlusPlus2a
           ? diag::ext_constexpr_function_try_block_cxx2a
           : diag::warn_cxx17_compat_constexpr_function_try_block)
      << isa<CXXConstructorDecl>(Dcl);
}

// - its function-body shall be [...] a compound-statement that contains only
//   [... list of cases ...]
//
// Note that walking the children here is enough to properly check for
// CompoundStmt and CXXTryStmt body.
SourceLocation Cxx1yLoc, Cxx2aLoc;
for (Stmt *SubStmt : Body->children()) {
  if (SubStmt &&
      !CheckConstexprFunctionStmt(*this, Dcl, SubStmt, ReturnStmts,
                                  Cxx1yLoc, Cxx2aLoc))
    return false;
}

if (Cxx2aLoc.isValid())
  Diag(Cxx2aLoc,
       getLangOpts().CPlusPlus2a
         ? diag::warn_cxx17_compat_constexpr_body_invalid_stmt
         : diag::ext_constexpr_body_invalid_stmt_cxx2a)
    << isa<CXXConstructorDecl>(Dcl);
if (Cxx1yLoc.isValid())
  Diag(Cxx1yLoc,
       getLangOpts().CPlusPlus14
         ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt
         : diag::ext_constexpr_body_invalid_stmt)
    << isa<CXXConstructorDecl>(Dcl);

if (const CXXConstructorDecl *Constructor
      = dyn_cast<CXXConstructorDecl>(Dcl)) {
  const CXXRecordDecl *RD = Constructor->getParent();
  // DR1359:
  // - every non-variant non-static data member and base class sub-object
  //   shall be initialized;
  // DR1460:
  // - if the class is a union having variant members, exactly one of them
  //   shall be initialized;
  if (RD->isUnion()) {
    if (Constructor->getNumCtorInitializers() == 0 &&
        RD->hasVariantMembers()) {
      Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init);
      return false;
    }
  } else if (!Constructor->isDependentContext() &&
             !Constructor->isDelegatingConstructor()) {
    assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases")((RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"
) ? static_cast<void> (0) : __assert_fail ("RD->getNumVBases() == 0 && \"constexpr ctor with virtual bases\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2009, __PRETTY_FUNCTION__));

    // Skip detailed checking if we have enough initializers, and we would
    // allow at most one initializer per member.
    bool AnyAnonStructUnionMembers = false;
    unsigned Fields = 0;
    for (CXXRecordDecl::field_iterator I = RD->field_begin(),
         E = RD->field_end(); I != E; ++I, ++Fields) {
      if (I->isAnonymousStructOrUnion()) {
        AnyAnonStructUnionMembers = true;
        break;
      }
    }
    // DR1460:
    // - if the class is a union-like class, but is not a union, for each of
    //   its anonymous union members having variant members, exactly one of
    //   them shall be initialized;
    if (AnyAnonStructUnionMembers ||
        Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) {
      // Check initialization of non-static data members. Base classes are
      // always initialized so do not need to be checked. Dependent bases
      // might not have initializers in the member initializer list.
      llvm::SmallSet<Decl*, 16> Inits;
      for (const auto *I: Constructor->inits()) {
        if (FieldDecl *FD = I->getMember())
          Inits.insert(FD);
        else if (IndirectFieldDecl *ID = I->getIndirectMember())
          Inits.insert(ID->chain_begin(), ID->chain_end());
      }

      bool Diagnosed = false;
      for (auto *I : RD->fields())
        CheckConstexprCtorInitializer(*this, Dcl, I, Inits, Diagnosed);
      if (Diagnosed)
        return false;
    }
  }
} else {
  if (ReturnStmts.empty()) {
    // C++1y doesn't require constexpr functions to contain a 'return'
    // statement. We still do, unless the return type might be void, because
    // otherwise if there's no return statement, the function cannot
    // be used in a core constant expression.
    bool OK = getLangOpts().CPlusPlus14 &&
              (Dcl->getReturnType()->isVoidType() ||
               Dcl->getReturnType()->isDependentType());
    Diag(Dcl->getLocation(),
         OK ? diag::warn_cxx11_compat_constexpr_body_no_return
            : diag::err_constexpr_body_no_return);
    if (!OK)
      return false;
  } else if (ReturnStmts.size() > 1) {
    Diag(ReturnStmts.back(),
         getLangOpts().CPlusPlus14
           ? diag::warn_cxx11_compat_constexpr_body_multiple_return
           : diag::ext_constexpr_body_multiple_return);
    for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I)
      Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return);
  }
}

// C++11 [dcl.constexpr]p5:
//   if no function argument values exist such that the function invocation
//   substitution would produce a constant expression, the program is
//   ill-formed; no diagnostic required.
// C++11 [dcl.constexpr]p3:
//   - every constructor call and implicit conversion used in initializing the
//     return value shall be one of those allowed in a constant expression.
// C++11 [dcl.constexpr]p4:
//   - every constructor involved in initializing non-static data members and
//     base class sub-objects shall be a constexpr constructor.
SmallVector<PartialDiagnosticAt, 8> Diags;
if (!Expr::isPotentialConstantExpr(Dcl, Diags)) {
  Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr)
    << isa<CXXConstructorDecl>(Dcl);
  for (size_t I = 0, N = Diags.size(); I != N; ++I)
    Diag(Diags[I].first, Diags[I].second);
  // Don't return false here: we allow this for compatibility in
  // system headers.
}

return true;
2091}

2093/// Get the class that is directly named by the current context. This is the
2094/// class for which an unqualified-id in this scope could name a constructor
2095/// or destructor.
2096///
2097/// If the scope specifier denotes a class, this will be that class.
2098/// If the scope specifier is empty, this will be the class whose
2099/// member-specification we are currently within. Otherwise, there
2100/// is no such class.
2101CXXRecordDecl *Sema::getCurrentClass(Scope *, const CXXScopeSpec *SS) {
assert(getLangOpts().CPlusPlus && "No class names in C!")((getLangOpts().CPlusPlus && "No class names in C!") ?
 static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No class names in C!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2102, __PRETTY_FUNCTION__));

if (SS && SS->isInvalid())
  return nullptr;

if (SS && SS->isNotEmpty()) {
  DeclContext *DC = computeDeclContext(*SS, true);
  return dyn_cast_or_null<CXXRecordDecl>(DC);
}

return dyn_cast_or_null<CXXRecordDecl>(CurContext);
2113}

2115/// isCurrentClassName - Determine whether the identifier II is the
2116/// name of the class type currently being defined. In the case of
2117/// nested classes, this will only return true if II is the name of
2118/// the innermost class.
2119bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *S,
                            const CXXScopeSpec *SS) {
CXXRecordDecl *CurDecl = getCurrentClass(S, SS);
return CurDecl && &II == CurDecl->getIdentifier();
2123}

2125/// Determine whether the identifier II is a typo for the name of
2126/// the class type currently being defined. If so, update it to the identifier
2127/// that should have been used.
2128bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) {
assert(getLangOpts().CPlusPlus && "No class names in C!")((getLangOpts().CPlusPlus && "No class names in C!") ?
 static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No class names in C!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2129, __PRETTY_FUNCTION__));

if (!getLangOpts().SpellChecking)
  return false;

CXXRecordDecl *CurDecl;
if (SS && SS->isSet() && !SS->isInvalid()) {
  DeclContext *DC = computeDeclContext(*SS, true);
  CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
} else
  CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);

if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() &&
    3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName())
        < II->getLength()) {
  II = CurDecl->getIdentifier();
  return true;
}

return false;
2149}

2151/// Determine whether the given class is a base class of the given
2152/// class, including looking at dependent bases.
2153static bool findCircularInheritance(const CXXRecordDecl *Class,
                                  const CXXRecordDecl *Current) {
SmallVector<const CXXRecordDecl*, 8> Queue;

Class = Class->getCanonicalDecl();
while (true) {
  for (const auto &I : Current->bases()) {
    CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl();
    if (!Base)
      continue;

    Base = Base->getDefinition();
    if (!Base)
      continue;

    if (Base->getCanonicalDecl() == Class)
      return true;

    Queue.push_back(Base);
  }

  if (Queue.empty())
    return false;

  Current = Queue.pop_back_val();
}

return false;
2181}

2183/// Check the validity of a C++ base class specifier.
2184///
2185/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
2186/// and returns NULL otherwise.
2187CXXBaseSpecifier *
2188Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
                       SourceRange SpecifierRange,
                       bool Virtual, AccessSpecifier Access,
                       TypeSourceInfo *TInfo,
                       SourceLocation EllipsisLoc) {
QualType BaseType = TInfo->getType();

// C++ [class.union]p1:
//   A union shall not have base classes.
if (Class->isUnion()) {
  Diag(Class->getLocation(), diag::err_base_clause_on_union)
    << SpecifierRange;
  return nullptr;
}

if (EllipsisLoc.isValid() &&
    !TInfo->getType()->containsUnexpandedParameterPack()) {
  Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
    << TInfo->getTypeLoc().getSourceRange();
  EllipsisLoc = SourceLocation();
}

SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();

if (BaseType->isDependentType()) {
  // Make sure that we don't have circular inheritance among our dependent
  // bases. For non-dependent bases, the check for completeness below handles
  // this.
  if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) {
    if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() ||
        ((BaseDecl = BaseDecl->getDefinition()) &&
         findCircularInheritance(Class, BaseDecl))) {
      Diag(BaseLoc, diag::err_circular_inheritance)
        << BaseType << Context.getTypeDeclType(Class);

      if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl())
        Diag(BaseDecl->getLocation(), diag::note_previous_decl)
          << BaseType;

      return nullptr;
    }
  }

  return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
                                        Class->getTagKind() == TTK_Class,
                                        Access, TInfo, EllipsisLoc);
}

// Base specifiers must be record types.
if (!BaseType->isRecordType()) {
  Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
  return nullptr;
}

// C++ [class.union]p1:
//   A union shall not be used as a base class.
if (BaseType->isUnionType()) {
  Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
  return nullptr;
}

// For the MS ABI, propagate DLL attributes to base class templates.
if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
  if (Attr *ClassAttr = getDLLAttr(Class)) {
    if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>(
            BaseType->getAsCXXRecordDecl())) {
      propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate,
                                          BaseLoc);
    }
  }
}

// C++ [class.derived]p2:
//   The class-name in a base-specifier shall not be an incompletely
//   defined class.
if (RequireCompleteType(BaseLoc, BaseType,
                        diag::err_incomplete_base_class, SpecifierRange)) {
  Class->setInvalidDecl();
  return nullptr;
}

// If the base class is polymorphic or isn't empty, the new one is/isn't, too.
RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
assert(BaseDecl && "Record type has no declaration")((BaseDecl && "Record type has no declaration") ? static_cast
<void> (0) : __assert_fail ("BaseDecl && \"Record type has no declaration\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2271, __PRETTY_FUNCTION__));
BaseDecl = BaseDecl->getDefinition();
assert(BaseDecl && "Base type is not incomplete, but has no definition")((BaseDecl && "Base type is not incomplete, but has no definition"
) ? static_cast<void> (0) : __assert_fail ("BaseDecl && \"Base type is not incomplete, but has no definition\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2273, __PRETTY_FUNCTION__));
CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
assert(CXXBaseDecl && "Base type is not a C++ type")((CXXBaseDecl && "Base type is not a C++ type") ? static_cast
<void> (0) : __assert_fail ("CXXBaseDecl && \"Base type is not a C++ type\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2275, __PRETTY_FUNCTION__));

// Microsoft docs say:
// "If a base-class has a code_seg attribute, derived classes must have the
// same attribute."
const auto *BaseCSA = CXXBaseDecl->getAttr<CodeSegAttr>();
const auto *DerivedCSA = Class->getAttr<CodeSegAttr>();
if ((DerivedCSA || BaseCSA) &&
    (!BaseCSA || !DerivedCSA || BaseCSA->getName() != DerivedCSA->getName())) {
  Diag(Class->getLocation(), diag::err_mismatched_code_seg_base);
  Diag(CXXBaseDecl->getLocation(), diag::note_base_class_specified_here)
    << CXXBaseDecl;
  return nullptr;
}

// A class which contains a flexible array member is not suitable for use as a
// base class:
//   - If the layout determines that a base comes before another base,
//     the flexible array member would index into the subsequent base.
//   - If the layout determines that base comes before the derived class,
//     the flexible array member would index into the derived class.
if (CXXBaseDecl->hasFlexibleArrayMember()) {
  Diag(BaseLoc, diag::err_base_class_has_flexible_array_member)
    << CXXBaseDecl->getDeclName();
  return nullptr;
}

// C++ [class]p3:
//   If a class is marked final and it appears as a base-type-specifier in
//   base-clause, the program is ill-formed.
if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) {
  Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
    << CXXBaseDecl->getDeclName()
    << FA->isSpelledAsSealed();
  Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at)
      << CXXBaseDecl->getDeclName() << FA->getRange();
  return nullptr;
}

if (BaseDecl->isInvalidDecl())
  Class->setInvalidDecl();

// Create the base specifier.
return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
                                      Class->getTagKind() == TTK_Class,
                                      Access, TInfo, EllipsisLoc);
2321}

2323/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
2324/// one entry in the base class list of a class specifier, for
2325/// example:
2326///    class foo : public bar, virtual private baz {
2327/// 'public bar' and 'virtual private baz' are each base-specifiers.
2328BaseResult
2329Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
                       ParsedAttributes &Attributes,
                       bool Virtual, AccessSpecifier Access,
                       ParsedType basetype, SourceLocation BaseLoc,
                       SourceLocation EllipsisLoc) {
if (!classdecl)
  return true;

AdjustDeclIfTemplate(classdecl);
CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
if (!Class)
  return true;

// We haven't yet attached the base specifiers.
Class->setIsParsingBaseSpecifiers();

// We do not support any C++11 attributes on base-specifiers yet.
// Diagnose any attributes we see.
for (const ParsedAttr &AL : Attributes) {
  if (AL.isInvalid() || AL.getKind() == ParsedAttr::IgnoredAttribute)
    continue;
  Diag(AL.getLoc(), AL.getKind() == ParsedAttr::UnknownAttribute
                        ? (unsigned)diag::warn_unknown_attribute_ignored
                        : (unsigned)diag::err_base_specifier_attribute)
      << AL.getName();
}

TypeSourceInfo *TInfo = nullptr;
GetTypeFromParser(basetype, &TInfo);

if (EllipsisLoc.isInvalid() &&
    DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
                                    UPPC_BaseType))
  return true;

if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
                                                    Virtual, Access, TInfo,
                                                    EllipsisLoc))
  return BaseSpec;
else
  Class->setInvalidDecl();

return true;
2372}

2374/// Use small set to collect indirect bases.  As this is only used
2375/// locally, there's no need to abstract the small size parameter.
2376typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet;

2378/// Recursively add the bases of Type.  Don't add Type itself.
2379static void
2380NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set,
                const QualType &Type)
2382{
// Even though the incoming type is a base, it might not be
// a class -- it could be a template parm, for instance.
if (auto Rec = Type->getAs<RecordType>()) {
  auto Decl = Rec->getAsCXXRecordDecl();

  // Iterate over its bases.
  for (const auto &BaseSpec : Decl->bases()) {
    QualType Base = Context.getCanonicalType(BaseSpec.getType())
      .getUnqualifiedType();
    if (Set.insert(Base).second)
      // If we've not already seen it, recurse.
      NoteIndirectBases(Context, Set, Base);
  }
}
2397}

2399/// Performs the actual work of attaching the given base class
2400/// specifiers to a C++ class.
2401bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class,
                              MutableArrayRef<CXXBaseSpecifier *> Bases) {
if (Bases.empty())
  return false;

// Used to keep track of which base types we have already seen, so
// that we can properly diagnose redundant direct base types. Note
// that the key is always the unqualified canonical type of the base
// class.
std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;

// Used to track indirect bases so we can see if a direct base is
// ambiguous.
IndirectBaseSet IndirectBaseTypes;

// Copy non-redundant base specifiers into permanent storage.
unsigned NumGoodBases = 0;
bool Invalid = false;
for (unsigned idx = 0; idx < Bases.size(); ++idx) {
  QualType NewBaseType
    = Context.getCanonicalType(Bases[idx]->getType());
  NewBaseType = NewBaseType.getLocalUnqualifiedType();

  CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType];
  if (KnownBase) {
    // C++ [class.mi]p3:
    //   A class shall not be specified as a direct base class of a
    //   derived class more than once.
    Diag(Bases[idx]->getBeginLoc(), diag::err_duplicate_base_class)
        << KnownBase->getType() << Bases[idx]->getSourceRange();

    // Delete the duplicate base class specifier; we're going to
    // overwrite its pointer later.
    Context.Deallocate(Bases[idx]);

    Invalid = true;
  } else {
    // Okay, add this new base class.
    KnownBase = Bases[idx];
    Bases[NumGoodBases++] = Bases[idx];

    // Note this base's direct & indirect bases, if there could be ambiguity.
    if (Bases.size() > 1)
      NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType);

    if (const RecordType *Record = NewBaseType->getAs<RecordType>()) {
      const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
      if (Class->isInterface() &&
            (!RD->isInterfaceLike() ||
             KnownBase->getAccessSpecifier() != AS_public)) {
        // The Microsoft extension __interface does not permit bases that
        // are not themselves public interfaces.
        Diag(KnownBase->getBeginLoc(), diag::err_invalid_base_in_interface)
            << getRecordDiagFromTagKind(RD->getTagKind()) << RD
            << RD->getSourceRange();
        Invalid = true;
      }
      if (RD->hasAttr<WeakAttr>())
        Class->addAttr(WeakAttr::CreateImplicit(Context));
    }
  }
}

// Attach the remaining base class specifiers to the derived class.
Class->setBases(Bases.data(), NumGoodBases);

// Check that the only base classes that are duplicate are virtual.
for (unsigned idx = 0; idx < NumGoodBases; ++idx) {
  // Check whether this direct base is inaccessible due to ambiguity.
  QualType BaseType = Bases[idx]->getType();

  // Skip all dependent types in templates being used as base specifiers.
  // Checks below assume that the base specifier is a CXXRecord.
  if (BaseType->isDependentType())
    continue;

  CanQualType CanonicalBase = Context.getCanonicalType(BaseType)
    .getUnqualifiedType();

  if (IndirectBaseTypes.count(CanonicalBase)) {
    CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
                       /*DetectVirtual=*/true);
    bool found
      = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths);
    assert(found)((found) ? static_cast<void> (0) : __assert_fail ("found"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2485, __PRETTY_FUNCTION__));
    (void)found;

    if (Paths.isAmbiguous(CanonicalBase))
      Diag(Bases[idx]->getBeginLoc(), diag::warn_inaccessible_base_class)
          << BaseType << getAmbiguousPathsDisplayString(Paths)
          << Bases[idx]->getSourceRange();
    else
      assert(Bases[idx]->isVirtual())((Bases[idx]->isVirtual()) ? static_cast<void> (0) :
 __assert_fail ("Bases[idx]->isVirtual()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2493, __PRETTY_FUNCTION__));
  }

  // Delete the base class specifier, since its data has been copied
  // into the CXXRecordDecl.
  Context.Deallocate(Bases[idx]);
}

return Invalid;
2502}

2504/// ActOnBaseSpecifiers - Attach the given base specifiers to the
2505/// class, after checking whether there are any duplicate base
2506/// classes.
2507void Sema::ActOnBaseSpecifiers(Decl *ClassDecl,
                             MutableArrayRef<CXXBaseSpecifier *> Bases) {
if (!ClassDecl || Bases.empty())
  return;

AdjustDeclIfTemplate(ClassDecl);
AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases);
2514}

2516/// Determine whether the type \p Derived is a C++ class that is
2517/// derived from the type \p Base.
2518bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) {
if (!getLangOpts().CPlusPlus)
  return false;

CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
if (!DerivedRD)
  return false;

CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
if (!BaseRD)
  return false;

// If either the base or the derived type is invalid, don't try to
// check whether one is derived from the other.
if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl())
  return false;

// FIXME: In a modules build, do we need the entire path to be visible for us
// to be able to use the inheritance relationship?
if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
  return false;

return DerivedRD->isDerivedFrom(BaseRD);
2541}

2543/// Determine whether the type \p Derived is a C++ class that is
2544/// derived from the type \p Base.
2545bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base,
                       CXXBasePaths &Paths) {
if (!getLangOpts().CPlusPlus)
  return false;

CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
if (!DerivedRD)
  return false;

CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
if (!BaseRD)
  return false;

if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
  return false;

return DerivedRD->isDerivedFrom(BaseRD, Paths);
2562}

2564static void BuildBasePathArray(const CXXBasePath &Path,
                             CXXCastPath &BasePathArray) {
// We first go backward and check if we have a virtual base.
// FIXME: It would be better if CXXBasePath had the base specifier for
// the nearest virtual base.
unsigned Start = 0;
for (unsigned I = Path.size(); I != 0; --I) {
  if (Path[I - 1].Base->isVirtual()) {
    Start = I - 1;
    break;
  }
}

// Now add all bases.
for (unsigned I = Start, E = Path.size(); I != E; ++I)
  BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
2580}


2583void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
                            CXXCastPath &BasePathArray) {
assert(BasePathArray.empty() && "Base path array must be empty!")((BasePathArray.empty() && "Base path array must be empty!"
) ? static_cast<void> (0) : __assert_fail ("BasePathArray.empty() && \"Base path array must be empty!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2585, __PRETTY_FUNCTION__));
assert(Paths.isRecordingPaths() && "Must record paths!")((Paths.isRecordingPaths() && "Must record paths!") ?
 static_cast<void> (0) : __assert_fail ("Paths.isRecordingPaths() && \"Must record paths!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2586, __PRETTY_FUNCTION__));
return ::BuildBasePathArray(Paths.front(), BasePathArray);
2588}
2589/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
2590/// conversion (where Derived and Base are class types) is
2591/// well-formed, meaning that the conversion is unambiguous (and
2592/// that all of the base classes are accessible). Returns true
2593/// and emits a diagnostic if the code is ill-formed, returns false
2594/// otherwise. Loc is the location where this routine should point to
2595/// if there is an error, and Range is the source range to highlight
2596/// if there is an error.
2597///
2598/// If either InaccessibleBaseID or AmbigiousBaseConvID are 0, then the
2599/// diagnostic for the respective type of error will be suppressed, but the
2600/// check for ill-formed code will still be performed.
2601bool
2602Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
                                 unsigned InaccessibleBaseID,
                                 unsigned AmbigiousBaseConvID,
                                 SourceLocation Loc, SourceRange Range,
                                 DeclarationName Name,
                                 CXXCastPath *BasePath,
                                 bool IgnoreAccess) {
// First, determine whether the path from Derived to Base is
// ambiguous. This is slightly more expensive than checking whether
// the Derived to Base conversion exists, because here we need to
// explore multiple paths to determine if there is an ambiguity.
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
                   /*DetectVirtual=*/false);
bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
if (!DerivationOkay)
  return true;

const CXXBasePath *Path = nullptr;
if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType()))
  Path = &Paths.front();

// For MSVC compatibility, check if Derived directly inherits from Base. Clang
// warns about this hierarchy under -Winaccessible-base, but MSVC allows the
// user to access such bases.
if (!Path && getLangOpts().MSVCCompat) {
  for (const CXXBasePath &PossiblePath : Paths) {
    if (PossiblePath.size() == 1) {
      Path = &PossiblePath;
      if (AmbigiousBaseConvID)
        Diag(Loc, diag::ext_ms_ambiguous_direct_base)
            << Base << Derived << Range;
      break;
    }
  }
}

if (Path) {
  if (!IgnoreAccess) {
    // Check that the base class can be accessed.
    switch (
        CheckBaseClassAccess(Loc, Base, Derived, *Path, InaccessibleBaseID)) {
    case AR_inaccessible:
      return true;
    case AR_accessible:
    case AR_dependent:
    case AR_delayed:
      break;
    }
  }

  // Build a base path if necessary.
  if (BasePath)
    ::BuildBasePathArray(*Path, *BasePath);
  return false;
}

if (AmbigiousBaseConvID) {
  // We know that the derived-to-base conversion is ambiguous, and
  // we're going to produce a diagnostic. Perform the derived-to-base
  // search just one more time to compute all of the possible paths so
  // that we can print them out. This is more expensive than any of
  // the previous derived-to-base checks we've done, but at this point
  // performance isn't as much of an issue.
  Paths.clear();
  Paths.setRecordingPaths(true);
  bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
  assert(StillOkay && "Can only be used with a derived-to-base conversion")((StillOkay && "Can only be used with a derived-to-base conversion"
) ? static_cast<void> (0) : __assert_fail ("StillOkay && \"Can only be used with a derived-to-base conversion\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2668, __PRETTY_FUNCTION__));
  (void)StillOkay;

  // Build up a textual representation of the ambiguous paths, e.g.,
  // D -> B -> A, that will be used to illustrate the ambiguous
  // conversions in the diagnostic. We only print one of the paths
  // to each base class subobject.
  std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);

  Diag(Loc, AmbigiousBaseConvID)
  << Derived << Base << PathDisplayStr << Range << Name;
}
return true;
2681}

2683bool
2684Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
                                 SourceLocation Loc, SourceRange Range,
                                 CXXCastPath *BasePath,
                                 bool IgnoreAccess) {
return CheckDerivedToBaseConversion(
    Derived, Base, diag::err_upcast_to_inaccessible_base,
    diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(),
    BasePath, IgnoreAccess);
2692}


2695/// Builds a string representing ambiguous paths from a
2696/// specific derived class to different subobjects of the same base
2697/// class.
2698///
2699/// This function builds a string that can be used in error messages
2700/// to show the different paths that one can take through the
2701/// inheritance hierarchy to go from the derived class to different
2702/// subobjects of a base class. The result looks something like this:
2703/// @code
2704/// struct D -> struct B -> struct A
2705/// struct D -> struct C -> struct A
2706/// @endcode
2707std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
std::string PathDisplayStr;
std::set<unsigned> DisplayedPaths;
for (CXXBasePaths::paths_iterator Path = Paths.begin();
     Path != Paths.end(); ++Path) {
  if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
    // We haven't displayed a path to this particular base
    // class subobject yet.
    PathDisplayStr += "\n    ";
    PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
    for (CXXBasePath::const_iterator Element = Path->begin();
         Element != Path->end(); ++Element)
      PathDisplayStr += " -> " + Element->Base->getType().getAsString();
  }
}

return PathDisplayStr;
2724}

2726//===----------------------------------------------------------------------===//
2727// C++ class member Handling
2728//===----------------------------------------------------------------------===//

2730/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
2731bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc,
                              SourceLocation ColonLoc,
                              const ParsedAttributesView &Attrs) {
assert(Access != AS_none && "Invalid kind for syntactic access specifier!")((Access != AS_none && "Invalid kind for syntactic access specifier!"
) ? static_cast<void> (0) : __assert_fail ("Access != AS_none && \"Invalid kind for syntactic access specifier!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2734, __PRETTY_FUNCTION__));
AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
                                                ASLoc, ColonLoc);
CurContext->addHiddenDecl(ASDecl);
return ProcessAccessDeclAttributeList(ASDecl, Attrs);
2739}

2741/// CheckOverrideControl - Check C++11 override control semantics.
2742void Sema::CheckOverrideControl(NamedDecl *D) {
if (D->isInvalidDecl())
  return;

// We only care about "override" and "final" declarations.
if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>())
  return;

CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);

// We can't check dependent instance methods.
if (MD && MD->isInstance() &&
    (MD->getParent()->hasAnyDependentBases() ||
     MD->getType()->isDependentType()))
  return;

if (MD && !MD->isVirtual()) {
  // If we have a non-virtual method, check if if hides a virtual method.
  // (In that case, it's most likely the method has the wrong type.)
  SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
  FindHiddenVirtualMethods(MD, OverloadedMethods);

  if (!OverloadedMethods.empty()) {
    if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
      Diag(OA->getLocation(),
           diag::override_keyword_hides_virtual_member_function)
        << "override" << (OverloadedMethods.size() > 1);
    } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
      Diag(FA->getLocation(),
           diag::override_keyword_hides_virtual_member_function)
        << (FA->isSpelledAsSealed() ? "sealed" : "final")
        << (OverloadedMethods.size() > 1);
    }
    NoteHiddenVirtualMethods(MD, OverloadedMethods);
    MD->setInvalidDecl();
    return;
  }
  // Fall through into the general case diagnostic.
  // FIXME: We might want to attempt typo correction here.
}

if (!MD || !MD->isVirtual()) {
  if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
    Diag(OA->getLocation(),
         diag::override_keyword_only_allowed_on_virtual_member_functions)
      << "override" << FixItHint::CreateRemoval(OA->getLocation());
    D->dropAttr<OverrideAttr>();
  }
  if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
    Diag(FA->getLocation(),
         diag::override_keyword_only_allowed_on_virtual_member_functions)
      << (FA->isSpelledAsSealed() ? "sealed" : "final")
      << FixItHint::CreateRemoval(FA->getLocation());
    D->dropAttr<FinalAttr>();
  }
  return;
}

// C++11 [class.virtual]p5:
//   If a function is marked with the virt-specifier override and
//   does not override a member function of a base class, the program is
//   ill-formed.
bool HasOverriddenMethods = MD->size_overridden_methods() != 0;
if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods)
  Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding)
    << MD->getDeclName();
2808}

2810void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D) {
if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>())
  return;
CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>())
  return;

SourceLocation Loc = MD->getLocation();
SourceLocation SpellingLoc = Loc;
if (getSourceManager().isMacroArgExpansion(Loc))
  SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).getBegin();
SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc);
if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc))
    return;

if (MD->size_overridden_methods() > 0) {
  unsigned DiagID = isa<CXXDestructorDecl>(MD)
                        ? diag::warn_destructor_marked_not_override_overriding
                        : diag::warn_function_marked_not_override_overriding;
  Diag(MD->getLocation(), DiagID) << MD->getDeclName();
  const CXXMethodDecl *OMD = *MD->begin_overridden_methods();
  Diag(OMD->getLocation(), diag::note_overridden_virtual_function);
}
2833}

2835/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
2836/// function overrides a virtual member function marked 'final', according to
2837/// C++11 [class.virtual]p4.
2838bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
                                                const CXXMethodDecl *Old) {
FinalAttr *FA = Old->getAttr<FinalAttr>();
if (!FA)
  return false;

Diag(New->getLocation(), diag::err_final_function_overridden)
  << New->getDeclName()
  << FA->isSpelledAsSealed();
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
2849}

2851static bool InitializationHasSideEffects(const FieldDecl &FD) {
const Type *T = FD.getType()->getBaseElementTypeUnsafe();
// FIXME: Destruction of ObjC lifetime types has side-effects.
if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
  return !RD->isCompleteDefinition() ||
         !RD->hasTrivialDefaultConstructor() ||
         !RD->hasTrivialDestructor();
return false;
2859}

2861static const ParsedAttr *getMSPropertyAttr(const ParsedAttributesView &list) {
ParsedAttributesView::const_iterator Itr =
    llvm::find_if(list, [](const ParsedAttr &AL) {
      return AL.isDeclspecPropertyAttribute();
    });
if (Itr != list.end())
  return &*Itr;
return nullptr;
2869}

2871// Check if there is a field shadowing.
2872void Sema::CheckShadowInheritedFields(const SourceLocation &Loc,
                                    DeclarationName FieldName,
                                    const CXXRecordDecl *RD,
                                    bool DeclIsField) {
if (Diags.isIgnored(diag::warn_shadow_field, Loc))
  return;

// To record a shadowed field in a base
std::map<CXXRecordDecl*, NamedDecl*> Bases;
auto FieldShadowed = [&](const CXXBaseSpecifier *Specifier,
                         CXXBasePath &Path) {
  const auto Base = Specifier->getType()->getAsCXXRecordDecl();
  // Record an ambiguous path directly
  if (Bases.find(Base) != Bases.end())
    return true;
  for (const auto Field : Base->lookup(FieldName)) {
    if ((isa<FieldDecl>(Field) || isa<IndirectFieldDecl>(Field)) &&
        Field->getAccess() != AS_private) {
      assert(Field->getAccess() != AS_none)((Field->getAccess() != AS_none) ? static_cast<void>
 (0) : __assert_fail ("Field->getAccess() != AS_none", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2890, __PRETTY_FUNCTION__));
      assert(Bases.find(Base) == Bases.end())((Bases.find(Base) == Bases.end()) ? static_cast<void> (
0) : __assert_fail ("Bases.find(Base) == Bases.end()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2891, __PRETTY_FUNCTION__));
      Bases[Base] = Field;
      return true;
    }
  }
  return false;
};

CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
                   /*DetectVirtual=*/true);
if (!RD->lookupInBases(FieldShadowed, Paths))
  return;

for (const auto &P : Paths) {
  auto Base = P.back().Base->getType()->getAsCXXRecordDecl();
  auto It = Bases.find(Base);
  // Skip duplicated bases
  if (It == Bases.end())
    continue;
  auto BaseField = It->second;
  assert(BaseField->getAccess() != AS_private)((BaseField->getAccess() != AS_private) ? static_cast<void
> (0) : __assert_fail ("BaseField->getAccess() != AS_private"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2911, __PRETTY_FUNCTION__));
  if (AS_none !=
      CXXRecordDecl::MergeAccess(P.Access, BaseField->getAccess())) {
    Diag(Loc, diag::warn_shadow_field)
      << FieldName << RD << Base << DeclIsField;
    Diag(BaseField->getLocation(), diag::note_shadow_field);
    Bases.erase(It);
  }
}
2920}

2922/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
2923/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
2924/// bitfield width if there is one, 'InitExpr' specifies the initializer if
2925/// one has been parsed, and 'InitStyle' is set if an in-class initializer is
2926/// present (but parsing it has been deferred).
2927NamedDecl *
2928Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
                             MultiTemplateParamsArg TemplateParameterLists,
                             Expr *BW, const VirtSpecifiers &VS,
                             InClassInitStyle InitStyle) {
const DeclSpec &DS = D.getDeclSpec();
DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
DeclarationName Name = NameInfo.getName();
SourceLocation Loc = NameInfo.getLoc();

// For anonymous bitfields, the location should point to the type.
if (Loc.isInvalid())
  Loc = D.getBeginLoc();

Expr *BitWidth = static_cast<Expr*>(BW);

assert(isa<CXXRecordDecl>(CurContext))((isa<CXXRecordDecl>(CurContext)) ? static_cast<void
> (0) : __assert_fail ("isa<CXXRecordDecl>(CurContext)"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2943, __PRETTY_FUNCTION__));
assert(!DS.isFriendSpecified())((!DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail
 ("!DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2944, __PRETTY_FUNCTION__));

bool isFunc = D.isDeclarationOfFunction();
const ParsedAttr *MSPropertyAttr =
    getMSPropertyAttr(D.getDeclSpec().getAttributes());

if (cast<CXXRecordDecl>(CurContext)->isInterface()) {
  // The Microsoft extension __interface only permits public member functions
  // and prohibits constructors, destructors, operators, non-public member
  // functions, static methods and data members.
  unsigned InvalidDecl;
  bool ShowDeclName = true;
  if (!isFunc &&
      (DS.getStorageClassSpec() == DeclSpec::SCS_typedef || MSPropertyAttr))
    InvalidDecl = 0;
  else if (!isFunc)
    InvalidDecl = 1;
  else if (AS != AS_public)
    InvalidDecl = 2;
  else if (DS.getStorageClassSpec() == DeclSpec::SCS_static)
    InvalidDecl = 3;
  else switch (Name.getNameKind()) {
    case DeclarationName::CXXConstructorName:
      InvalidDecl = 4;
      ShowDeclName = false;
      break;

    case DeclarationName::CXXDestructorName:
      InvalidDecl = 5;
      ShowDeclName = false;
      break;

    case DeclarationName::CXXOperatorName:
    case DeclarationName::CXXConversionFunctionName:
      InvalidDecl = 6;
      break;

    default:
      InvalidDecl = 0;
      break;
  }

  if (InvalidDecl) {
    if (ShowDeclName)
      Diag(Loc, diag::err_invalid_member_in_interface)
        << (InvalidDecl-1) << Name;
    else
      Diag(Loc, diag::err_invalid_member_in_interface)
        << (InvalidDecl-1) << "";
    return nullptr;
  }
}

// C++ 9.2p6: A member shall not be declared to have automatic storage
// duration (auto, register) or with the extern storage-class-specifier.
// C++ 7.1.1p8: The mutable specifier can be applied only to names of class
// data members and cannot be applied to names declared const or static,
// and cannot be applied to reference members.
switch (DS.getStorageClassSpec()) {
case DeclSpec::SCS_unspecified:
case DeclSpec::SCS_typedef:
case DeclSpec::SCS_static:
  break;
case DeclSpec::SCS_mutable:
  if (isFunc) {
    Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);

    // FIXME: It would be nicer if the keyword was ignored only for this
    // declarator. Otherwise we could get follow-up errors.
    D.getMutableDeclSpec().ClearStorageClassSpecs();
  }
  break;
default:
  Diag(DS.getStorageClassSpecLoc(),
       diag::err_storageclass_invalid_for_member);
  D.getMutableDeclSpec().ClearStorageClassSpecs();
  break;
}

bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
                     DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
                    !isFunc);

if (DS.isConstexprSpecified() && isInstField) {
  SemaDiagnosticBuilder B =
      Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member);
  SourceLocation ConstexprLoc = DS.getConstexprSpecLoc();
  if (InitStyle == ICIS_NoInit) {
    B << 0 << 0;
    if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const)
      B << FixItHint::CreateRemoval(ConstexprLoc);
    else {
      B << FixItHint::CreateReplacement(ConstexprLoc, "const");
      D.getMutableDeclSpec().ClearConstexprSpec();
      const char *PrevSpec;
      unsigned DiagID;
      bool Failed = D.getMutableDeclSpec().SetTypeQual(
          DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts());
      (void)Failed;
      assert(!Failed && "Making a constexpr member const shouldn't fail")((!Failed && "Making a constexpr member const shouldn't fail"
) ? static_cast<void> (0) : __assert_fail ("!Failed && \"Making a constexpr member const shouldn't fail\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3043, __PRETTY_FUNCTION__));
    }
  } else {
    B << 1;
    const char *PrevSpec;
    unsigned DiagID;
    if (D.getMutableDeclSpec().SetStorageClassSpec(
        *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID,
        Context.getPrintingPolicy())) {
      assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&((DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&
 "This is the only DeclSpec that should fail to be applied") ?
 static_cast<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_mutable && \"This is the only DeclSpec that should fail to be applied\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3053, __PRETTY_FUNCTION__))
             "This is the only DeclSpec that should fail to be applied")((DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&
 "This is the only DeclSpec that should fail to be applied") ?
 static_cast<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_mutable && \"This is the only DeclSpec that should fail to be applied\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3053, __PRETTY_FUNCTION__));
      B << 1;
    } else {
      B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static ");
      isInstField = false;
    }
  }
}

NamedDecl *Member;
if (isInstField) {
  CXXScopeSpec &SS = D.getCXXScopeSpec();

  // Data members must have identifiers for names.
  if (!Name.isIdentifier()) {
    Diag(Loc, diag::err_bad_variable_name)
      << Name;
    return nullptr;
  }

  IdentifierInfo *II = Name.getAsIdentifierInfo();

  // Member field could not be with "template" keyword.
  // So TemplateParameterLists should be empty in this case.
  if (TemplateParameterLists.size()) {
    TemplateParameterList* TemplateParams = TemplateParameterLists[0];
    if (TemplateParams->size()) {
      // There is no such thing as a member field template.
      Diag(D.getIdentifierLoc(), diag::err_template_member)
          << II
          << SourceRange(TemplateParams->getTemplateLoc(),
              TemplateParams->getRAngleLoc());
    } else {
      // There is an extraneous 'template<>' for this member.
      Diag(TemplateParams->getTemplateLoc(),
          diag::err_template_member_noparams)
          << II
          << SourceRange(TemplateParams->getTemplateLoc(),
              TemplateParams->getRAngleLoc());
    }
    return nullptr;
  }

  if (SS.isSet() && !SS.isInvalid()) {
    // The user provided a superfluous scope specifier inside a class
    // definition:
    //
    // class X {
    //   int X::member;
    // };
    if (DeclContext *DC = computeDeclContext(SS, false))
      diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc(),
                                   D.getName().getKind() ==
                                       UnqualifiedIdKind::IK_TemplateId);
    else
      Diag(D.getIdentifierLoc(), diag::err_member_qualification)
        << Name << SS.getRange();

    SS.clear();
  }

  if (MSPropertyAttr) {
    Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D,
                              BitWidth, InitStyle, AS, *MSPropertyAttr);
    if (!Member)
      return nullptr;
    isInstField = false;
  } else {
    Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D,
                              BitWidth, InitStyle, AS);
    if (!Member)
      return nullptr;
  }

  CheckShadowInheritedFields(Loc, Name, cast<CXXRecordDecl>(CurContext));
} else {
  Member = HandleDeclarator(S, D, TemplateParameterLists);
  if (!Member)
    return nullptr;

  // Non-instance-fields can't have a bitfield.
  if (BitWidth) {
    if (Member->isInvalidDecl()) {
      // don't emit another diagnostic.
    } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) {
      // C++ 9.6p3: A bit-field shall not be a static member.
      // "static member 'A' cannot be a bit-field"
      Diag(Loc, diag::err_static_not_bitfield)
        << Name << BitWidth->getSourceRange();
    } else if (isa<TypedefDecl>(Member)) {
      // "typedef member 'x' cannot be a bit-field"
      Diag(Loc, diag::err_typedef_not_bitfield)
        << Name << BitWidth->getSourceRange();
    } else {
      // A function typedef ("typedef int f(); f a;").
      // C++ 9.6p3: A bit-field shall have integral or enumeration type.
      Diag(Loc, diag::err_not_integral_type_bitfield)
        << Name << cast<ValueDecl>(Member)->getType()
        << BitWidth->getSourceRange();
    }

    BitWidth = nullptr;
    Member->setInvalidDecl();
  }

  NamedDecl *NonTemplateMember = Member;
  if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
    NonTemplateMember = FunTmpl->getTemplatedDecl();
  else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member))
    NonTemplateMember = VarTmpl->getTemplatedDecl();

  Member->setAccess(AS);

  // If we have declared a member function template or static data member
  // template, set the access of the templated declaration as well.
  if (NonTemplateMember != Member)
    NonTemplateMember->setAccess(AS);

  // C++ [temp.deduct.guide]p3:
  //   A deduction guide [...] for a member class template [shall be
  //   declared] with the same access [as the template].
  if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) {
    auto *TD = DG->getDeducedTemplate();
    // Access specifiers are only meaningful if both the template and the
    // deduction guide are from the same scope.
    if (AS != TD->getAccess() &&
        TD->getDeclContext()->getRedeclContext()->Equals(
            DG->getDeclContext()->getRedeclContext())) {
      Diag(DG->getBeginLoc(), diag::err_deduction_guide_wrong_access);
      Diag(TD->getBeginLoc(), diag::note_deduction_guide_template_access)
          << TD->getAccess();
      const AccessSpecDecl *LastAccessSpec = nullptr;
      for (const auto *D : cast<CXXRecordDecl>(CurContext)->decls()) {
        if (const auto *AccessSpec = dyn_cast<AccessSpecDecl>(D))
          LastAccessSpec = AccessSpec;
      }
      assert(LastAccessSpec && "differing access with no access specifier")((LastAccessSpec && "differing access with no access specifier"
) ? static_cast<void> (0) : __assert_fail ("LastAccessSpec && \"differing access with no access specifier\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3189, __PRETTY_FUNCTION__));
      Diag(LastAccessSpec->getBeginLoc(), diag::note_deduction_guide_access)
          << AS;
    }
  }
}

if (VS.isOverrideSpecified())
  Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context, 0));
if (VS.isFinalSpecified())
  Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context,
                                          VS.isFinalSpelledSealed()));

if (VS.getLastLocation().isValid()) {
  // Update the end location of a method that has a virt-specifiers.
  if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
    MD->setRangeEnd(VS.getLastLocation());
}

CheckOverrideControl(Member);

assert((Name || isInstField) && "No identifier for non-field ?")(((Name || isInstField) && "No identifier for non-field ?"
) ? static_cast<void> (0) : __assert_fail ("(Name || isInstField) && \"No identifier for non-field ?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3210, __PRETTY_FUNCTION__));

if (isInstField) {
  FieldDecl *FD = cast<FieldDecl>(Member);
  FieldCollector->Add(FD);

  if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) {
    // Remember all explicit private FieldDecls that have a name, no side
    // effects and are not part of a dependent type declaration.
    if (!FD->isImplicit() && FD->getDeclName() &&
        FD->getAccess() == AS_private &&
        !FD->hasAttr<UnusedAttr>() &&
        !FD->getParent()->isDependentContext() &&
        !InitializationHasSideEffects(*FD))
      UnusedPrivateFields.insert(FD);
  }
}

return Member;
3229}

3231namespace {
class UninitializedFieldVisitor
    : public EvaluatedExprVisitor<UninitializedFieldVisitor> {
  Sema &S;
  // List of Decls to generate a warning on.  Also remove Decls that become
  // initialized.
  llvm::SmallPtrSetImpl<ValueDecl*> &Decls;
  // List of base classes of the record.  Classes are removed after their
  // initializers.
  llvm::SmallPtrSetImpl<QualType> &BaseClasses;
  // Vector of decls to be removed from the Decl set prior to visiting the
  // nodes.  These Decls may have been initialized in the prior initializer.
  llvm::SmallVector<ValueDecl*, 4> DeclsToRemove;
  // If non-null, add a note to the warning pointing back to the constructor.
  const CXXConstructorDecl *Constructor;
  // Variables to hold state when processing an initializer list.  When
  // InitList is true, special case initialization of FieldDecls matching
  // InitListFieldDecl.
  bool InitList;
  FieldDecl *InitListFieldDecl;
  llvm::SmallVector<unsigned, 4> InitFieldIndex;

public:
  typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited;
  UninitializedFieldVisitor(Sema &S,
                            llvm::SmallPtrSetImpl<ValueDecl*> &Decls,
                            llvm::SmallPtrSetImpl<QualType> &BaseClasses)
    : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses),
      Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {}

  // Returns true if the use of ME is not an uninitialized use.
  bool IsInitListMemberExprInitialized(MemberExpr *ME,
                                       bool CheckReferenceOnly) {
    llvm::SmallVector<FieldDecl*, 4> Fields;
    bool ReferenceField = false;
    while (ME) {
      FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
      if (!FD)
        return false;
      Fields.push_back(FD);
      if (FD->getType()->isReferenceType())
        ReferenceField = true;
      ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts());
    }

    // Binding a reference to an uninitialized field is not an
    // uninitialized use.
    if (CheckReferenceOnly && !ReferenceField)
      return true;

    llvm::SmallVector<unsigned, 4> UsedFieldIndex;
    // Discard the first field since it is the field decl that is being
    // initialized.
    for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) {
      UsedFieldIndex.push_back((*I)->getFieldIndex());
    }

    for (auto UsedIter = UsedFieldIndex.begin(),
              UsedEnd = UsedFieldIndex.end(),
              OrigIter = InitFieldIndex.begin(),
              OrigEnd = InitFieldIndex.end();
         UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) {
      if (*UsedIter < *OrigIter)
        return true;
      if (*UsedIter > *OrigIter)
        break;
    }

    return false;
  }

  void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly,
                        bool AddressOf) {
    if (isa<EnumConstantDecl>(ME->getMemberDecl()))
      return;

    // FieldME is the inner-most MemberExpr that is not an anonymous struct
    // or union.
    MemberExpr *FieldME = ME;

    bool AllPODFields = FieldME->getType().isPODType(S.Context);

    Expr *Base = ME;
    while (MemberExpr *SubME =
               dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) {

      if (isa<VarDecl>(SubME->getMemberDecl()))
        return;

      if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl()))
        if (!FD->isAnonymousStructOrUnion())
          FieldME = SubME;

      if (!FieldME->getType().isPODType(S.Context))
        AllPODFields = false;

      Base = SubME->getBase();
    }

    if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts()))
      return;

    if (AddressOf && AllPODFields)
      return;

    ValueDecl* FoundVD = FieldME->getMemberDecl();

    if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) {
      while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) {
        BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr());
      }

      if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) {
        QualType T = BaseCast->getType();
        if (T->isPointerType() &&
            BaseClasses.count(T->getPointeeType())) {
          S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit)
              << T->getPointeeType() << FoundVD;
        }
      }
    }

    if (!Decls.count(FoundVD))
      return;

    const bool IsReference = FoundVD->getType()->isReferenceType();

    if (InitList && !AddressOf && FoundVD == InitListFieldDecl) {
      // Special checking for initializer lists.
      if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) {
        return;
      }
    } else {
      // Prevent double warnings on use of unbounded references.
      if (CheckReferenceOnly && !IsReference)
        return;
    }

    unsigned diag = IsReference
        ? diag::warn_reference_field_is_uninit
        : diag::warn_field_is_uninit;
    S.Diag(FieldME->getExprLoc(), diag) << FoundVD;
    if (Constructor)
      S.Diag(Constructor->getLocation(),
             diag::note_uninit_in_this_constructor)
        << (Constructor->isDefaultConstructor() && Constructor->isImplicit());

  }

  void HandleValue(Expr *E, bool AddressOf) {
    E = E->IgnoreParens();

    if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
      HandleMemberExpr(ME, false /*CheckReferenceOnly*/,
                       AddressOf /*AddressOf*/);
      return;
    }

    if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
      Visit(CO->getCond());
      HandleValue(CO->getTrueExpr(), AddressOf);
      HandleValue(CO->getFalseExpr(), AddressOf);
      return;
    }

    if (BinaryConditionalOperator *BCO =
            dyn_cast<BinaryConditionalOperator>(E)) {
      Visit(BCO->getCond());
      HandleValue(BCO->getFalseExpr(), AddressOf);
      return;
    }

    if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
      HandleValue(OVE->getSourceExpr(), AddressOf);
      return;
    }

    if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
      switch (BO->getOpcode()) {
      default:
        break;
      case(BO_PtrMemD):
      case(BO_PtrMemI):
        HandleValue(BO->getLHS(), AddressOf);
        Visit(BO->getRHS());
        return;
      case(BO_Comma):
        Visit(BO->getLHS());
        HandleValue(BO->getRHS(), AddressOf);
        return;
      }
    }

    Visit(E);
  }

  void CheckInitListExpr(InitListExpr *ILE) {
    InitFieldIndex.push_back(0);
    for (auto Child : ILE->children()) {
      if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) {
        CheckInitListExpr(SubList);
      } else {
        Visit(Child);
      }
      ++InitFieldIndex.back();
    }
    InitFieldIndex.pop_back();
  }

  void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor,
                        FieldDecl *Field, const Type *BaseClass) {
    // Remove Decls that may have been initialized in the previous
    // initializer.
    for (ValueDecl* VD : DeclsToRemove)
      Decls.erase(VD);
    DeclsToRemove.clear();

    Constructor = FieldConstructor;
    InitListExpr *ILE = dyn_cast<InitListExpr>(E);

    if (ILE && Field) {
      InitList = true;
      InitListFieldDecl = Field;
      InitFieldIndex.clear();
      CheckInitListExpr(ILE);
    } else {
      InitList = false;
      Visit(E);
    }

    if (Field)
      Decls.erase(Field);
    if (BaseClass)
      BaseClasses.erase(BaseClass->getCanonicalTypeInternal());
  }

  void VisitMemberExpr(MemberExpr *ME) {
    // All uses of unbounded reference fields will warn.
    HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/);
  }

  void VisitImplicitCastExpr(ImplicitCastExpr *E) {
    if (E->getCastKind() == CK_LValueToRValue) {
      HandleValue(E->getSubExpr(), false /*AddressOf*/);
      return;
    }

    Inherited::VisitImplicitCastExpr(E);
  }

  void VisitCXXConstructExpr(CXXConstructExpr *E) {
    if (E->getConstructor()->isCopyConstructor()) {
      Expr *ArgExpr = E->getArg(0);
      if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr))
        if (ILE->getNumInits() == 1)
          ArgExpr = ILE->getInit(0);
      if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
        if (ICE->getCastKind() == CK_NoOp)
          ArgExpr = ICE->getSubExpr();
      HandleValue(ArgExpr, false /*AddressOf*/);
      return;
    }
    Inherited::VisitCXXConstructExpr(E);
  }

  void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
    Expr *Callee = E->getCallee();
    if (isa<MemberExpr>(Callee)) {
      HandleValue(Callee, false /*AddressOf*/);
      for (auto Arg : E->arguments())
        Visit(Arg);
      return;
    }

    Inherited::VisitCXXMemberCallExpr(E);
  }

  void VisitCallExpr(CallExpr *E) {
    // Treat std::move as a use.
    if (E->isCallToStdMove()) {
      HandleValue(E->getArg(0), /*AddressOf=*/false);
      return;
    }

    Inherited::VisitCallExpr(E);
  }

  void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
    Expr *Callee = E->getCallee();

    if (isa<UnresolvedLookupExpr>(Callee))
      return Inherited::VisitCXXOperatorCallExpr(E);

    Visit(Callee);
    for (auto Arg : E->arguments())
      HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/);
  }

  void VisitBinaryOperator(BinaryOperator *E) {
    // If a field assignment is detected, remove the field from the
    // uninitiailized field set.
    if (E->getOpcode() == BO_Assign)
      if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS()))
        if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
          if (!FD->getType()->isReferenceType())
            DeclsToRemove.push_back(FD);

    if (E->isCompoundAssignmentOp()) {
      HandleValue(E->getLHS(), false /*AddressOf*/);
      Visit(E->getRHS());
      return;
    }

    Inherited::VisitBinaryOperator(E);
  }

  void VisitUnaryOperator(UnaryOperator *E) {
    if (E->isIncrementDecrementOp()) {
      HandleValue(E->getSubExpr(), false /*AddressOf*/);
      return;
    }
    if (E->getOpcode() == UO_AddrOf) {
      if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) {
        HandleValue(ME->getBase(), true /*AddressOf*/);
        return;
      }
    }

    Inherited::VisitUnaryOperator(E);
  }
};

// Diagnose value-uses of fields to initialize themselves, e.g.
//   foo(foo)
// where foo is not also a parameter to the constructor.
// Also diagnose across field uninitialized use such as
//   x(y), y(x)
// TODO: implement -Wuninitialized and fold this into that framework.
static void DiagnoseUninitializedFields(
    Sema &SemaRef, const CXXConstructorDecl *Constructor) {

  if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit,
                                         Constructor->getLocation())) {
    return;
  }

  if (Constructor->isInvalidDecl())
    return;

  const CXXRecordDecl *RD = Constructor->getParent();

  if (RD->getDescribedClassTemplate())
    return;

  // Holds fields that are uninitialized.
  llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields;

  // At the beginning, all fields are uninitialized.
  for (auto *I : RD->decls()) {
    if (auto *FD = dyn_cast<FieldDecl>(I)) {
      UninitializedFields.insert(FD);
    } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) {
      UninitializedFields.insert(IFD->getAnonField());
    }
  }

  llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses;
  for (auto I : RD->bases())
    UninitializedBaseClasses.insert(I.getType().getCanonicalType());

  if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
    return;

  UninitializedFieldVisitor UninitializedChecker(SemaRef,
                                                 UninitializedFields,
                                                 UninitializedBaseClasses);

  for (const auto *FieldInit : Constructor->inits()) {
    if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
      break;

    Expr *InitExpr = FieldInit->getInit();
    if (!InitExpr)
      continue;

    if (CXXDefaultInitExpr *Default =
            dyn_cast<CXXDefaultInitExpr>(InitExpr)) {
      InitExpr = Default->getExpr();
      if (!InitExpr)
        continue;
      // In class initializers will point to the constructor.
      UninitializedChecker.CheckInitializer(InitExpr, Constructor,
                                            FieldInit->getAnyMember(),
                                            FieldInit->getBaseClass());
    } else {
      UninitializedChecker.CheckInitializer(InitExpr, nullptr,
                                            FieldInit->getAnyMember(),
                                            FieldInit->getBaseClass());
    }
  }
}
3632} // namespace

3634/// Enter a new C++ default initializer scope. After calling this, the
3635/// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if
3636/// parsing or instantiating the initializer failed.
3637void Sema::ActOnStartCXXInClassMemberInitializer() {
// Create a synthetic function scope to represent the call to the constructor
// that notionally surrounds a use of this initializer.
PushFunctionScope();
3641}

3643/// This is invoked after parsing an in-class initializer for a
3644/// non-static C++ class member, and after instantiating an in-class initializer
3645/// in a class template. Such actions are deferred until the class is complete.
3646void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D,
                                                SourceLocation InitLoc,
                                                Expr *InitExpr) {
// Pop the notional constructor scope we created earlier.
PopFunctionScopeInfo(nullptr, D);

FieldDecl *FD = dyn_cast<FieldDecl>(D);
assert((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) &&(((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle
() != ICIS_NoInit) && "must set init style when field is created"
) ? static_cast<void> (0) : __assert_fail ("(isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) && \"must set init style when field is created\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3654, __PRETTY_FUNCTION__))
       "must set init style when field is created")(((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle
() != ICIS_NoInit) && "must set init style when field is created"
) ? static_cast<void> (0) : __assert_fail ("(isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) && \"must set init style when field is created\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3654, __PRETTY_FUNCTION__));

if (!InitExpr) {
  D->setInvalidDecl();
  if (FD)
    FD->removeInClassInitializer();
  return;
}

if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) {
  FD->setInvalidDecl();
  FD->removeInClassInitializer();
  return;
}

ExprResult Init = InitExpr;
if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
  InitializedEntity Entity =
      InitializedEntity::InitializeMemberFromDefaultMemberInitializer(FD);
  InitializationKind Kind =
      FD->getInClassInitStyle() == ICIS_ListInit
          ? InitializationKind::CreateDirectList(InitExpr->getBeginLoc(),
                                                 InitExpr->getBeginLoc(),
                                                 InitExpr->getEndLoc())
          : InitializationKind::CreateCopy(InitExpr->getBeginLoc(), InitLoc);
  InitializationSequence Seq(*this, Entity, Kind, InitExpr);
  Init = Seq.Perform(*this, Entity, Kind, InitExpr);
  if (Init.isInvalid()) {
    FD->setInvalidDecl();
    return;
  }
}

// C++11 [class.base.init]p7:
//   The initialization of each base and member constitutes a
//   full-expression.
Init = ActOnFinishFullExpr(Init.get(), InitLoc, /*DiscardedValue*/ false);
if (Init.isInvalid()) {
  FD->setInvalidDecl();
  return;
}

InitExpr = Init.get();

FD->setInClassInitializer(InitExpr);
3699}

3701/// Find the direct and/or virtual base specifiers that
3702/// correspond to the given base type, for use in base initialization
3703/// within a constructor.
3704static bool FindBaseInitializer(Sema &SemaRef,
                              CXXRecordDecl *ClassDecl,
                              QualType BaseType,
                              const CXXBaseSpecifier *&DirectBaseSpec,
                              const CXXBaseSpecifier *&VirtualBaseSpec) {
// First, check for a direct base class.
DirectBaseSpec = nullptr;
for (const auto &Base : ClassDecl->bases()) {
  if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) {
    // We found a direct base of this type. That's what we're
    // initializing.
    DirectBaseSpec = &Base;
    break;
  }
}

// Check for a virtual base class.
// FIXME: We might be able to short-circuit this if we know in advance that
// there are no virtual bases.
VirtualBaseSpec = nullptr;
if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
  // We haven't found a base yet; search the class hierarchy for a
  // virtual base class.
  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
                     /*DetectVirtual=*/false);
  if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(),
                            SemaRef.Context.getTypeDeclType(ClassDecl),
                            BaseType, Paths)) {
    for (CXXBasePaths::paths_iterator Path = Paths.begin();
         Path != Paths.end(); ++Path) {
      if (Path->back().Base->isVirtual()) {
        VirtualBaseSpec = Path->back().Base;
        break;
      }
    }
  }
}

return DirectBaseSpec || VirtualBaseSpec;
3743}

3745/// Handle a C++ member initializer using braced-init-list syntax.
3746MemInitResult
3747Sema::ActOnMemInitializer(Decl *ConstructorD,
                        Scope *S,
                        CXXScopeSpec &SS,
                        IdentifierInfo *MemberOrBase,
                        ParsedType TemplateTypeTy,
                        const DeclSpec &DS,
                        SourceLocation IdLoc,
                        Expr *InitList,
                        SourceLocation EllipsisLoc) {
return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
                           DS, IdLoc, InitList,
                           EllipsisLoc);
3759}

3761/// Handle a C++ member initializer using parentheses syntax.
3762MemInitResult
3763Sema::ActOnMemInitializer(Decl *ConstructorD,
                        Scope *S,
                        CXXScopeSpec &SS,
                        IdentifierInfo *MemberOrBase,
                        ParsedType TemplateTypeTy,
                        const DeclSpec &DS,
                        SourceLocation IdLoc,
                        SourceLocation LParenLoc,
                        ArrayRef<Expr *> Args,
                        SourceLocation RParenLoc,
                        SourceLocation EllipsisLoc) {
Expr *List = ParenListExpr::Create(Context, LParenLoc, Args, RParenLoc);
return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
                           DS, IdLoc, List, EllipsisLoc);
3777}

3779namespace {

3781// Callback to only accept typo corrections that can be a valid C++ member
3782// intializer: either a non-static field member or a base class.
3783class MemInitializerValidatorCCC final : public CorrectionCandidateCallback {
3784public:
explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl)
    : ClassDecl(ClassDecl) {}

bool ValidateCandidate(const TypoCorrection &candidate) override {
  if (NamedDecl *ND = candidate.getCorrectionDecl()) {
    if (FieldDecl *Member = dyn_cast<FieldDecl>(ND))
      return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl);
    return isa<TypeDecl>(ND);
  }
  return false;
}

std::unique_ptr<CorrectionCandidateCallback> clone() override {
  return llvm::make_unique<MemInitializerValidatorCCC>(*this);
}

3801private:
CXXRecordDecl *ClassDecl;
3803};

3805}

3807ValueDecl *Sema::tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl,
                                           CXXScopeSpec &SS,
                                           ParsedType TemplateTypeTy,
                                           IdentifierInfo *MemberOrBase) {
if (SS.getScopeRep() || TemplateTypeTy)
  return nullptr;
DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
if (Result.empty())
  return nullptr;
ValueDecl *Member;
if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
    (Member = dyn_cast<IndirectFieldDecl>(Result.front())))
  return Member;
return nullptr;
3821}

3823/// Handle a C++ member initializer.
3824MemInitResult
3825Sema::BuildMemInitializer(Decl *ConstructorD,
                        Scope *S,
                        CXXScopeSpec &SS,
                        IdentifierInfo *MemberOrBase,
                        ParsedType TemplateTypeTy,
                        const DeclSpec &DS,
                        SourceLocation IdLoc,
                        Expr *Init,
                        SourceLocation EllipsisLoc) {
ExprResult Res = CorrectDelayedTyposInExpr(Init);
if (!Res.isUsable())
  return true;
Init = Res.get();

if (!ConstructorD)
  return true;

AdjustDeclIfTemplate(ConstructorD);

CXXConstructorDecl *Constructor
  = dyn_cast<CXXConstructorDecl>(ConstructorD);
if (!Constructor) {
  // The user wrote a constructor initializer on a function that is
  // not a C++ constructor. Ignore the error for now, because we may
  // have more member initializers coming; we'll diagnose it just
  // once in ActOnMemInitializers.
  return true;
}

CXXRecordDecl *ClassDecl = Constructor->getParent();

// C++ [class.base.init]p2:
//   Names in a mem-initializer-id are looked up in the scope of the
//   constructor's class and, if not found in that scope, are looked
//   up in the scope containing the constructor's definition.
//   [Note: if the constructor's class contains a member with the
//   same name as a direct or virtual base class of the class, a
//   mem-initializer-id naming the member or base class and composed
//   of a single identifier refers to the class member. A
//   mem-initializer-id for the hidden base class may be specified
//   using a qualified name. ]

// Look for a member, first.
if (ValueDecl *Member = tryLookupCtorInitMemberDecl(
        ClassDecl, SS, TemplateTypeTy, MemberOrBase)) {
  if (EllipsisLoc.isValid())
    Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
        << MemberOrBase
        << SourceRange(IdLoc, Init->getSourceRange().getEnd());

  return BuildMemberInitializer(Member, Init, IdLoc);
}
// It didn't name a member, so see if it names a class.
QualType BaseType;
TypeSourceInfo *TInfo = nullptr;

if (TemplateTypeTy) {
  BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
  if (BaseType.isNull())
    return true;
} else if (DS.getTypeSpecType() == TST_decltype) {
  BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
} else if (DS.getTypeSpecType() == TST_decltype_auto) {
  Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid);
  return true;
} else {
  LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
  LookupParsedName(R, S, &SS);

  TypeDecl *TyD = R.getAsSingle<TypeDecl>();
  if (!TyD) {
    if (R.isAmbiguous()) return true;

    // We don't want access-control diagnostics here.
    R.suppressDiagnostics();

    if (SS.isSet() && isDependentScopeSpecifier(SS)) {
      bool NotUnknownSpecialization = false;
      DeclContext *DC = computeDeclContext(SS, false);
      if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
        NotUnknownSpecialization = !Record->hasAnyDependentBases();

      if (!NotUnknownSpecialization) {
        // When the scope specifier can refer to a member of an unknown
        // specialization, we take it as a type name.
        BaseType = CheckTypenameType(ETK_None, SourceLocation(),
                                     SS.getWithLocInContext(Context),
                                     *MemberOrBase, IdLoc);
        if (BaseType.isNull())
          return true;

        TInfo = Context.CreateTypeSourceInfo(BaseType);
        DependentNameTypeLoc TL =
            TInfo->getTypeLoc().castAs<DependentNameTypeLoc>();
        if (!TL.isNull()) {
          TL.setNameLoc(IdLoc);
          TL.setElaboratedKeywordLoc(SourceLocation());
          TL.setQualifierLoc(SS.getWithLocInContext(Context));
        }

        R.clear();
        R.setLookupName(MemberOrBase);
      }
    }

    // If no results were found, try to correct typos.
    TypoCorrection Corr;
    MemInitializerValidatorCCC CCC(ClassDecl);
    if (R.empty() && BaseType.isNull() &&
        (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
                            CCC, CTK_ErrorRecovery, ClassDecl))) {
      if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
        // We have found a non-static data member with a similar
        // name to what was typed; complain and initialize that
        // member.
        diagnoseTypo(Corr,
                     PDiag(diag::err_mem_init_not_member_or_class_suggest)
                       << MemberOrBase << true);
        return BuildMemberInitializer(Member, Init, IdLoc);
      } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
        const CXXBaseSpecifier *DirectBaseSpec;
        const CXXBaseSpecifier *VirtualBaseSpec;
        if (FindBaseInitializer(*this, ClassDecl,
                                Context.getTypeDeclType(Type),
                                DirectBaseSpec, VirtualBaseSpec)) {
          // We have found a direct or virtual base class with a
          // similar name to what was typed; complain and initialize
          // that base class.
          diagnoseTypo(Corr,
                       PDiag(diag::err_mem_init_not_member_or_class_suggest)
                         << MemberOrBase << false,
                       PDiag() /*Suppress note, we provide our own.*/);

          const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec
                                                            : VirtualBaseSpec;
          Diag(BaseSpec->getBeginLoc(), diag::note_base_class_specified_here)
              << BaseSpec->getType() << BaseSpec->getSourceRange();

          TyD = Type;
        }
      }
    }

    if (!TyD && BaseType.isNull()) {
      Diag(IdLoc, diag::err_mem_init_not_member_or_class)
        << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd());
      return true;
    }
  }

  if (BaseType.isNull()) {
    BaseType = Context.getTypeDeclType(TyD);
    MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false);
    if (SS.isSet()) {
      BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(),
                                           BaseType);
      TInfo = Context.CreateTypeSourceInfo(BaseType);
      ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>();
      TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc);
      TL.setElaboratedKeywordLoc(SourceLocation());
      TL.setQualifierLoc(SS.getWithLocInContext(Context));
    }
  }
}

if (!TInfo)
  TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);

return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc);
3994}

3996MemInitResult
3997Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init,
                           SourceLocation IdLoc) {
FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
assert((DirectMember || IndirectMember) &&(((DirectMember || IndirectMember) && "Member must be a FieldDecl or IndirectFieldDecl"
) ? static_cast<void> (0) : __assert_fail ("(DirectMember || IndirectMember) && \"Member must be a FieldDecl or IndirectFieldDecl\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4002, __PRETTY_FUNCTION__))
       "Member must be a FieldDecl or IndirectFieldDecl")(((DirectMember || IndirectMember) && "Member must be a FieldDecl or IndirectFieldDecl"
) ? static_cast<void> (0) : __assert_fail ("(DirectMember || IndirectMember) && \"Member must be a FieldDecl or IndirectFieldDecl\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4002, __PRETTY_FUNCTION__));

if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
  return true;

if (Member->isInvalidDecl())
  return true;

MultiExprArg Args;
if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
  Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
} else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
  Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
} else {
  // Template instantiation doesn't reconstruct ParenListExprs for us.
  Args = Init;
}

SourceRange InitRange = Init->getSourceRange();

if (Member->getType()->isDependentType() || Init->isTypeDependent()) {
  // Can't check initialization for a member of dependent type or when
  // any of the arguments are type-dependent expressions.
  DiscardCleanupsInEvaluationContext();
} else {
  bool InitList = false;
  if (isa<InitListExpr>(Init)) {
    InitList = true;
    Args = Init;
  }

  // Initialize the member.
  InitializedEntity MemberEntity =
    DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr)
                 : InitializedEntity::InitializeMember(IndirectMember,
                                                       nullptr);
  InitializationKind Kind =
      InitList ? InitializationKind::CreateDirectList(
                     IdLoc, Init->getBeginLoc(), Init->getEndLoc())
               : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(),
                                                  InitRange.getEnd());

  InitializationSequence InitSeq(*this, MemberEntity, Kind, Args);
  ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args,
                                          nullptr);
  if (MemberInit.isInvalid())
    return true;

  // C++11 [class.base.init]p7:
  //   The initialization of each base and member constitutes a
  //   full-expression.
  MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin(),
                                   /*DiscardedValue*/ false);
  if (MemberInit.isInvalid())
    return true;

  Init = MemberInit.get();
}

if (DirectMember) {
  return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc,
                                          InitRange.getBegin(), Init,
                                          InitRange.getEnd());
} else {
  return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc,
                                          InitRange.getBegin(), Init,
                                          InitRange.getEnd());
}
4070}

4072MemInitResult
4073Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init,
                               CXXRecordDecl *ClassDecl) {
SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
if (!LangOpts.CPlusPlus11)
  return Diag(NameLoc, diag::err_delegating_ctor)
    << TInfo->getTypeLoc().getLocalSourceRange();
Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor);

bool InitList = true;
MultiExprArg Args = Init;
if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
  InitList = false;
  Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
}

SourceRange InitRange = Init->getSourceRange();
// Initialize the object.
InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
                                   QualType(ClassDecl->getTypeForDecl(), 0));
InitializationKind Kind =
    InitList ? InitializationKind::CreateDirectList(
                   NameLoc, Init->getBeginLoc(), Init->getEndLoc())
             : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(),
                                                InitRange.getEnd());
InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args);
ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind,
                                            Args, nullptr);
if (DelegationInit.isInvalid())
  return true;

assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&((cast<CXXConstructExpr>(DelegationInit.get())->getConstructor
() && "Delegating constructor with no target?") ? static_cast
<void> (0) : __assert_fail ("cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && \"Delegating constructor with no target?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4104, __PRETTY_FUNCTION__))
       "Delegating constructor with no target?")((cast<CXXConstructExpr>(DelegationInit.get())->getConstructor
() && "Delegating constructor with no target?") ? static_cast
<void> (0) : __assert_fail ("cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && \"Delegating constructor with no target?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4104, __PRETTY_FUNCTION__));

// C++11 [class.base.init]p7:
//   The initialization of each base and member constitutes a
//   full-expression.
DelegationInit = ActOnFinishFullExpr(
    DelegationInit.get(), InitRange.getBegin(), /*DiscardedValue*/ false);
if (DelegationInit.isInvalid())
  return true;

// If we are in a dependent context, template instantiation will
// perform this type-checking again. Just save the arguments that we
// received in a ParenListExpr.
// FIXME: This isn't quite ideal, since our ASTs don't capture all
// of the information that we have about the base
// initializer. However, deconstructing the ASTs is a dicey process,
// and this approach is far more likely to get the corner cases right.
if (CurContext->isDependentContext())
  DelegationInit = Init;

return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(),
                                        DelegationInit.getAs<Expr>(),
                                        InitRange.getEnd());
4127}

4129MemInitResult
4130Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
                         Expr *Init, CXXRecordDecl *ClassDecl,
                         SourceLocation EllipsisLoc) {
SourceLocation BaseLoc
  = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();

if (!BaseType->isDependentType() && !BaseType->isRecordType())
  return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
           << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();

// C++ [class.base.init]p2:
//   [...] Unless the mem-initializer-id names a nonstatic data
//   member of the constructor's class or a direct or virtual base
//   of that class, the mem-initializer is ill-formed. A
//   mem-initializer-list can initialize a base class using any
//   name that denotes that base class type.
bool Dependent = BaseType->isDependentType() || Init->isTypeDependent();

SourceRange InitRange = Init->getSourceRange();
if (EllipsisLoc.isValid()) {
  // This is a pack expansion.
  if (!BaseType->containsUnexpandedParameterPack())  {
    Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
      << SourceRange(BaseLoc, InitRange.getEnd());

    EllipsisLoc = SourceLocation();
  }
} else {
  // Check for any unexpanded parameter packs.
  if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
    return true;

  if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
    return true;
}

// Check for direct and virtual base classes.
const CXXBaseSpecifier *DirectBaseSpec = nullptr;
const CXXBaseSpecifier *VirtualBaseSpec = nullptr;
if (!Dependent) {
  if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
                                     BaseType))
    return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl);

  FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
                      VirtualBaseSpec);

  // C++ [base.class.init]p2:
  // Unless the mem-initializer-id names a nonstatic data member of the
  // constructor's class or a direct or virtual base of that class, the
  // mem-initializer is ill-formed.
  if (!DirectBaseSpec && !VirtualBaseSpec) {
    // If the class has any dependent bases, then it's possible that
    // one of those types will resolve to the same type as
    // BaseType. Therefore, just treat this as a dependent base
    // class initialization.  FIXME: Should we try to check the
    // initialization anyway? It seems odd.
    if (ClassDecl->hasAnyDependentBases())
      Dependent = true;
    else
      return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
        << BaseType << Context.getTypeDeclType(ClassDecl)
        << BaseTInfo->getTypeLoc().getLocalSourceRange();
  }
}

if (Dependent) {
  DiscardCleanupsInEvaluationContext();

  return new (Context) CXXCtorInitializer(Context, BaseTInfo,
                                          /*IsVirtual=*/false,
                                          InitRange.getBegin(), Init,
                                          InitRange.getEnd(), EllipsisLoc);
}

// C++ [base.class.init]p2:
//   If a mem-initializer-id is ambiguous because it designates both
//   a direct non-virtual base class and an inherited virtual base
//   class, the mem-initializer is ill-formed.
if (DirectBaseSpec && VirtualBaseSpec)
  return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
    << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();

const CXXBaseSpecifier *BaseSpec = DirectBaseSpec;
if (!BaseSpec)
  BaseSpec = VirtualBaseSpec;

// Initialize the base.
bool InitList = true;
MultiExprArg Args = Init;
if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
  InitList = false;
  Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
}

InitializedEntity BaseEntity =
  InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
InitializationKind Kind =
    InitList ? InitializationKind::CreateDirectList(BaseLoc)
             : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(),
                                                InitRange.getEnd());
InitializationSequence InitSeq(*this, BaseEntity, Kind, Args);
ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr);
if (BaseInit.isInvalid())
  return true;

// C++11 [class.base.init]p7:
//   The initialization of each base and member constitutes a
//   full-expression.
BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin(),
                               /*DiscardedValue*/ false);
if (BaseInit.isInvalid())
  return true;

// If we are in a dependent context, template instantiation will
// perform this type-checking again. Just save the arguments that we
// received in a ParenListExpr.
// FIXME: This isn't quite ideal, since our ASTs don't capture all
// of the information that we have about the base
// initializer. However, deconstructing the ASTs is a dicey process,
// and this approach is far more likely to get the corner cases right.
if (CurContext->isDependentContext())
  BaseInit = Init;

return new (Context) CXXCtorInitializer(Context, BaseTInfo,
                                        BaseSpec->isVirtual(),
                                        InitRange.getBegin(),
                                        BaseInit.getAs<Expr>(),
                                        InitRange.getEnd(), EllipsisLoc);
4259}

4261// Create a static_cast\<T&&>(expr).
4262static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) {
if (T.isNull()) T = E->getType();
QualType TargetType = SemaRef.BuildReferenceType(
    T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName());
SourceLocation ExprLoc = E->getBeginLoc();
TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo(
    TargetType, ExprLoc);

return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
                                 SourceRange(ExprLoc, ExprLoc),
                                 E->getSourceRange()).get();
4273}

4275/// ImplicitInitializerKind - How an implicit base or member initializer should
4276/// initialize its base or member.
4277enum ImplicitInitializerKind {
IIK_Default,
IIK_Copy,
IIK_Move,
IIK_Inherit
4282};

4284static bool
4285BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
                           ImplicitInitializerKind ImplicitInitKind,
                           CXXBaseSpecifier *BaseSpec,
                           bool IsInheritedVirtualBase,
                           CXXCtorInitializer *&CXXBaseInit) {
InitializedEntity InitEntity
  = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
                                      IsInheritedVirtualBase);

ExprResult BaseInit;

switch (ImplicitInitKind) {
case IIK_Inherit:
case IIK_Default: {
  InitializationKind InitKind
    = InitializationKind::CreateDefault(Constructor->getLocation());
  InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
  BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
  break;
}

case IIK_Move:
case IIK_Copy: {
  bool Moving = ImplicitInitKind == IIK_Move;
  ParmVarDecl *Param = Constructor->getParamDecl(0);
  QualType ParamType = Param->getType().getNonReferenceType();

  Expr *CopyCtorArg =
    DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
                        SourceLocation(), Param, false,
                        Constructor->getLocation(), ParamType,
                        VK_LValue, nullptr);

  SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg));

  // Cast to the base class to avoid ambiguities.
  QualType ArgTy =
    SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
                                     ParamType.getQualifiers());

  if (Moving) {
    CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg);
  }

  CXXCastPath BasePath;
  BasePath.push_back(BaseSpec);
  CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
                                          CK_UncheckedDerivedToBase,
                                          Moving ? VK_XValue : VK_LValue,
                                          &BasePath).get();

  InitializationKind InitKind
    = InitializationKind::CreateDirect(Constructor->getLocation(),
                                       SourceLocation(), SourceLocation());
  InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg);
  BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg);
  break;
}
}

BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
if (BaseInit.isInvalid())
  return true;

CXXBaseInit =
  new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
             SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
                                                      SourceLocation()),
                                           BaseSpec->isVirtual(),
                                           SourceLocation(),
                                           BaseInit.getAs<Expr>(),
                                           SourceLocation(),
                                           SourceLocation());

return false;
4360}

4362static bool RefersToRValueRef(Expr *MemRef) {
ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl();
return Referenced->getType()->isRValueReferenceType();
4365}

4367static bool
4368BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
                             ImplicitInitializerKind ImplicitInitKind,
                             FieldDecl *Field, IndirectFieldDecl *Indirect,
                             CXXCtorInitializer *&CXXMemberInit) {
if (Field->isInvalidDecl())
  return true;

SourceLocation Loc = Constructor->getLocation();

if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) {
  bool Moving = ImplicitInitKind == IIK_Move;
  ParmVarDecl *Param = Constructor->getParamDecl(0);
  QualType ParamType = Param->getType().getNonReferenceType();

  // Suppress copying zero-width bitfields.
  if (Field->isZeroLengthBitField(SemaRef.Context))
    return false;

  Expr *MemberExprBase =
    DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
                        SourceLocation(), Param, false,
                        Loc, ParamType, VK_LValue, nullptr);

  SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase));

  if (Moving) {
    MemberExprBase = CastForMoving(SemaRef, MemberExprBase);
  }

  // Build a reference to this field within the parameter.
  CXXScopeSpec SS;
  LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
                            Sema::LookupMemberName);
  MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect)
                                : cast<ValueDecl>(Field), AS_public);
  MemberLookup.resolveKind();
  ExprResult CtorArg
    = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
                                       ParamType, Loc,
                                       /*IsArrow=*/false,
                                       SS,
                                       /*TemplateKWLoc=*/SourceLocation(),
                                       /*FirstQualifierInScope=*/nullptr,
                                       MemberLookup,
                                       /*TemplateArgs=*/nullptr,
                                       /*S*/nullptr);
  if (CtorArg.isInvalid())
    return true;

  // C++11 [class.copy]p15:
  //   - if a member m has rvalue reference type T&&, it is direct-initialized
  //     with static_cast<T&&>(x.m);
  if (RefersToRValueRef(CtorArg.get())) {
    CtorArg = CastForMoving(SemaRef, CtorArg.get());
  }

  InitializedEntity Entity =
      Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr,
                                                     /*Implicit*/ true)
               : InitializedEntity::InitializeMember(Field, nullptr,
                                                     /*Implicit*/ true);

  // Direct-initialize to use the copy constructor.
  InitializationKind InitKind =
    InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());

  Expr *CtorArgE = CtorArg.getAs<Expr>();
  InitializationSequence InitSeq(SemaRef, Entity, InitKind, CtorArgE);
  ExprResult MemberInit =
      InitSeq.Perform(SemaRef, Entity, InitKind, MultiExprArg(&CtorArgE, 1));
  MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
  if (MemberInit.isInvalid())
    return true;

  if (Indirect)
    CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(
        SemaRef.Context, Indirect, Loc, Loc, MemberInit.getAs<Expr>(), Loc);
  else
    CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(
        SemaRef.Context, Field, Loc, Loc, MemberInit.getAs<Expr>(), Loc);
  return false;
}

assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) &&(((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit
) && "Unhandled implicit init kind!") ? static_cast<
void> (0) : __assert_fail ("(ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && \"Unhandled implicit init kind!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4452, __PRETTY_FUNCTION__))
       "Unhandled implicit init kind!")(((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit
) && "Unhandled implicit init kind!") ? static_cast<
void> (0) : __assert_fail ("(ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && \"Unhandled implicit init kind!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4452, __PRETTY_FUNCTION__));

QualType FieldBaseElementType =
  SemaRef.Context.getBaseElementType(Field->getType());

if (FieldBaseElementType->isRecordType()) {
  InitializedEntity InitEntity =
      Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr,
                                                     /*Implicit*/ true)
               : InitializedEntity::InitializeMember(Field, nullptr,
                                                     /*Implicit*/ true);
  InitializationKind InitKind =
    InitializationKind::CreateDefault(Loc);

  InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
  ExprResult MemberInit =
    InitSeq.Perform(SemaRef, InitEntity, InitKind, None);

  MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
  if (MemberInit.isInvalid())
    return true;

  if (Indirect)
    CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
                                                             Indirect, Loc,
                                                             Loc,
                                                             MemberInit.get(),
                                                             Loc);
  else
    CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
                                                             Field, Loc, Loc,
                                                             MemberInit.get(),
                                                             Loc);
  return false;
}

if (!Field->getParent()->isUnion()) {
  if (FieldBaseElementType->isReferenceType()) {
    SemaRef.Diag(Constructor->getLocation(),
                 diag::err_uninitialized_member_in_ctor)
    << (int)Constructor->isImplicit()
    << SemaRef.Context.getTagDeclType(Constructor->getParent())
    << 0 << Field->getDeclName();
    SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
    return true;
  }

  if (FieldBaseElementType.isConstQualified()) {
    SemaRef.Diag(Constructor->getLocation(),
                 diag::err_uninitialized_member_in_ctor)
    << (int)Constructor->isImplicit()
    << SemaRef.Context.getTagDeclType(Constructor->getParent())
    << 1 << Field->getDeclName();
    SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
    return true;
  }
}

if (FieldBaseElementType.hasNonTrivialObjCLifetime()) {
  // ARC and Weak:
  //   Default-initialize Objective-C pointers to NULL.
  CXXMemberInit
    = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
                                               Loc, Loc,
               new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
                                               Loc);
  return false;
}

// Nothing to initialize.
CXXMemberInit = nullptr;
return false;
4524}

4526namespace {
4527struct BaseAndFieldInfo {
Sema &S;
CXXConstructorDecl *Ctor;
bool AnyErrorsInInits;
ImplicitInitializerKind IIK;
llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
SmallVector<CXXCtorInitializer*, 8> AllToInit;
llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember;

BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
  : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
  bool Generated = Ctor->isImplicit() || Ctor->isDefaulted();
  if (Ctor->getInheritedConstructor())
    IIK = IIK_Inherit;
  else if (Generated && Ctor->isCopyConstructor())
    IIK = IIK_Copy;
  else if (Generated && Ctor->isMoveConstructor())
    IIK = IIK_Move;
  else
    IIK = IIK_Default;
}

bool isImplicitCopyOrMove() const {
  switch (IIK) {
  case IIK_Copy:
  case IIK_Move:
    return true;

  case IIK_Default:
  case IIK_Inherit:
    return false;
  }

  llvm_unreachable("Invalid ImplicitInitializerKind!")::llvm::llvm_unreachable_internal("Invalid ImplicitInitializerKind!"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4560);
}

bool addFieldInitializer(CXXCtorInitializer *Init) {
  AllToInit.push_back(Init);

  // Check whether this initializer makes the field "used".
  if (Init->getInit()->HasSideEffects(S.Context))
    S.UnusedPrivateFields.remove(Init->getAnyMember());

  return false;
}

bool isInactiveUnionMember(FieldDecl *Field) {
  RecordDecl *Record = Field->getParent();
  if (!Record->isUnion())
    return false;

  if (FieldDecl *Active =
          ActiveUnionMember.lookup(Record->getCanonicalDecl()))
    return Active != Field->getCanonicalDecl();

  // In an implicit copy or move constructor, ignore any in-class initializer.
  if (isImplicitCopyOrMove())
    return true;

  // If there's no explicit initialization, the field is active only if it
  // has an in-class initializer...
  if (Field->hasInClassInitializer())
    return false;
  // ... or it's an anonymous struct or union whose class has an in-class
  // initializer.
  if (!Field->isAnonymousStructOrUnion())
    return true;
  CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl();
  return !FieldRD->hasInClassInitializer();
}

/// Determine whether the given field is, or is within, a union member
/// that is inactive (because there was an initializer given for a different
/// member of the union, or because the union was not initialized at all).
bool isWithinInactiveUnionMember(FieldDecl *Field,
                                 IndirectFieldDecl *Indirect) {
  if (!Indirect)
    return isInactiveUnionMember(Field);

  for (auto *C : Indirect->chain()) {
    FieldDecl *Field = dyn_cast<FieldDecl>(C);
    if (Field && isInactiveUnionMember(Field))
      return true;
  }
  return false;
}
4613};
4614}

4616/// Determine whether the given type is an incomplete or zero-lenfgth
4617/// array type.
4618static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) {
if (T->isIncompleteArrayType())
  return true;

while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) {
  if (!ArrayT->getSize())
    return true;

  T = ArrayT->getElementType();
}

return false;
4630}

4632static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
                                  FieldDecl *Field,
                                  IndirectFieldDecl *Indirect = nullptr) {
if (Field->isInvalidDecl())
  return false;

// Overwhelmingly common case: we have a direct initializer for this field.
if (CXXCtorInitializer *Init =
        Info.AllBaseFields.lookup(Field->getCanonicalDecl()))
  return Info.addFieldInitializer(Init);

// C++11 [class.base.init]p8:
//   if the entity is a non-static data member that has a
//   brace-or-equal-initializer and either
//   -- the constructor's class is a union and no other variant member of that
//      union is designated by a mem-initializer-id or
//   -- the constructor's class is not a union, and, if the entity is a member
//      of an anonymous union, no other member of that union is designated by
//      a mem-initializer-id,
//   the entity is initialized as specified in [dcl.init].
//
// We also apply the same rules to handle anonymous structs within anonymous
// unions.
if (Info.isWithinInactiveUnionMember(Field, Indirect))
  return false;

if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) {
  ExprResult DIE =
      SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field);
  if (DIE.isInvalid())
    return true;

  auto Entity = InitializedEntity::InitializeMember(Field, nullptr, true);
  SemaRef.checkInitializerLifetime(Entity, DIE.get());

  CXXCtorInitializer *Init;
  if (Indirect)
    Init = new (SemaRef.Context)
        CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(),
                           SourceLocation(), DIE.get(), SourceLocation());
  else
    Init = new (SemaRef.Context)
        CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(),
                           SourceLocation(), DIE.get(), SourceLocation());
  return Info.addFieldInitializer(Init);
}

// Don't initialize incomplete or zero-length arrays.
if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType()))
  return false;

// Don't try to build an implicit initializer if there were semantic
// errors in any of the initializers (and therefore we might be
// missing some that the user actually wrote).
if (Info.AnyErrorsInInits)
  return false;

CXXCtorInitializer *Init = nullptr;
if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field,
                                   Indirect, Init))
  return true;

if (!Init)
  return false;

return Info.addFieldInitializer(Init);
4698}

4700bool
4701Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
                             CXXCtorInitializer *Initializer) {
assert(Initializer->isDelegatingInitializer())((Initializer->isDelegatingInitializer()) ? static_cast<
void> (0) : __assert_fail ("Initializer->isDelegatingInitializer()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4703, __PRETTY_FUNCTION__));
Constructor->setNumCtorInitializers(1);
CXXCtorInitializer **initializer =
  new (Context) CXXCtorInitializer*[1];
memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
Constructor->setCtorInitializers(initializer);

if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
  MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor);
  DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
}

DelegatingCtorDecls.push_back(Constructor);

DiagnoseUninitializedFields(*this, Constructor);

return false;
4720}

4722bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
                             ArrayRef<CXXCtorInitializer *> Initializers) {
if (Constructor->isDependentContext()) {
  // Just store the initializers as written, they will be checked during
  // instantiation.
  if (!Initializers.empty()) {
    Constructor->setNumCtorInitializers(Initializers.size());
    CXXCtorInitializer **baseOrMemberInitializers =
      new (Context) CXXCtorInitializer*[Initializers.size()];
    memcpy(baseOrMemberInitializers, Initializers.data(),
           Initializers.size() * sizeof(CXXCtorInitializer*));
    Constructor->setCtorInitializers(baseOrMemberInitializers);
  }

  // Let template instantiation know whether we had errors.
  if (AnyErrors)
    Constructor->setInvalidDecl();

  return false;
}

BaseAndFieldInfo Info(*this, Constructor, AnyErrors);

// We need to build the initializer AST according to order of construction
// and not what user specified in the Initializers list.
CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
if (!ClassDecl)
  return true;

bool HadError = false;

for (unsigned i = 0; i < Initializers.size(); i++) {
  CXXCtorInitializer *Member = Initializers[i];

  if (Member->isBaseInitializer())
    Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
  else {
    Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member;

    if (IndirectFieldDecl *F = Member->getIndirectMember()) {
      for (auto *C : F->chain()) {
        FieldDecl *FD = dyn_cast<FieldDecl>(C);
        if (FD && FD->getParent()->isUnion())
          Info.ActiveUnionMember.insert(std::make_pair(
              FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
      }
    } else if (FieldDecl *FD = Member->getMember()) {
      if (FD->getParent()->isUnion())
        Info.ActiveUnionMember.insert(std::make_pair(
            FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
    }
  }
}

// Keep track of the direct virtual bases.
llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
for (auto &I : ClassDecl->bases()) {
  if (I.isVirtual())
    DirectVBases.insert(&I);
}

// Push virtual bases before others.
for (auto &VBase : ClassDecl->vbases()) {
  if (CXXCtorInitializer *Value
      = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) {
    // [class.base.init]p7, per DR257:
    //   A mem-initializer where the mem-initializer-id names a virtual base
    //   class is ignored during execution of a constructor of any class that
    //   is not the most derived class.
    if (ClassDecl->isAbstract()) {
      // FIXME: Provide a fixit to remove the base specifier. This requires
      // tracking the location of the associated comma for a base specifier.
      Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored)
        << VBase.getType() << ClassDecl;
      DiagnoseAbstractType(ClassDecl);
    }

    Info.AllToInit.push_back(Value);
  } else if (!AnyErrors && !ClassDecl->isAbstract()) {
    // [class.base.init]p8, per DR257:
    //   If a given [...] base class is not named by a mem-initializer-id
    //   [...] and the entity is not a virtual base class of an abstract
    //   class, then [...] the entity is default-initialized.
    bool IsInheritedVirtualBase = !DirectVBases.count(&VBase);
    CXXCtorInitializer *CXXBaseInit;
    if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
                                     &VBase, IsInheritedVirtualBase,
                                     CXXBaseInit)) {
      HadError = true;
      continue;
    }

    Info.AllToInit.push_back(CXXBaseInit);
  }
}

// Non-virtual bases.
for (auto &Base : ClassDecl->bases()) {
  // Virtuals are in the virtual base list and already constructed.
  if (Base.isVirtual())
    continue;

  if (CXXCtorInitializer *Value
        = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) {
    Info.AllToInit.push_back(Value);
  } else if (!AnyErrors) {
    CXXCtorInitializer *CXXBaseInit;
    if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
                                     &Base, /*IsInheritedVirtualBase=*/false,
                                     CXXBaseInit)) {
      HadError = true;
      continue;
    }

    Info.AllToInit.push_back(CXXBaseInit);
  }
}

// Fields.
for (auto *Mem : ClassDecl->decls()) {
  if (auto *F = dyn_cast<FieldDecl>(Mem)) {
    // C++ [class.bit]p2:
    //   A declaration for a bit-field that omits the identifier declares an
    //   unnamed bit-field. Unnamed bit-fields are not members and cannot be
    //   initialized.
    if (F->isUnnamedBitfield())
      continue;

    // If we're not generating the implicit copy/move constructor, then we'll
    // handle anonymous struct/union fields based on their individual
    // indirect fields.
    if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove())
      continue;

    if (CollectFieldInitializer(*this, Info, F))
      HadError = true;
    continue;
  }

  // Beyond this point, we only consider default initialization.
  if (Info.isImplicitCopyOrMove())
    continue;

  if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) {
    if (F->getType()->isIncompleteArrayType()) {
      assert(ClassDecl->hasFlexibleArrayMember() &&((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4868, __PRETTY_FUNCTION__))
             "Incomplete array type is not valid")((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4868, __PRETTY_FUNCTION__));
      continue;
    }

    // Initialize each field of an anonymous struct individually.
    if (CollectFieldInitializer(*this, Info, F->getAnonField(), F))
      HadError = true;

    continue;
  }
}

unsigned NumInitializers = Info.AllToInit.size();
if (NumInitializers > 0) {
  Constructor->setNumCtorInitializers(NumInitializers);
  CXXCtorInitializer **baseOrMemberInitializers =
    new (Context) CXXCtorInitializer*[NumInitializers];
  memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
         NumInitializers * sizeof(CXXCtorInitializer*));
  Constructor->setCtorInitializers(baseOrMemberInitializers);

  // Constructors implicitly reference the base and member
  // destructors.
  MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
                                         Constructor->getParent());
}

return HadError;
4896}

4898static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) {
if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
  const RecordDecl *RD = RT->getDecl();
  if (RD->isAnonymousStructOrUnion()) {
    for (auto *Field : RD->fields())
      PopulateKeysForFields(Field, IdealInits);
    return;
  }
}
IdealInits.push_back(Field->getCanonicalDecl());
4908}

4910static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
return Context.getCanonicalType(BaseType).getTypePtr();
4912}

4914static const void *GetKeyForMember(ASTContext &Context,
                                 CXXCtorInitializer *Member) {
if (!Member->isAnyMemberInitializer())
  return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));

return Member->getAnyMember()->getCanonicalDecl();
4920}

4922static void DiagnoseBaseOrMemInitializerOrder(
  Sema &SemaRef, const CXXConstructorDecl *Constructor,
  ArrayRef<CXXCtorInitializer *> Inits) {
if (Constructor->getDeclContext()->isDependentContext())
  return;

// Don't check initializers order unless the warning is enabled at the
// location of at least one initializer.
bool ShouldCheckOrder = false;
for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
  CXXCtorInitializer *Init = Inits[InitIndex];
  if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order,
                               Init->getSourceLocation())) {
    ShouldCheckOrder = true;
    break;
  }
}
if (!ShouldCheckOrder)
  return;

// Build the list of bases and members in the order that they'll
// actually be initialized.  The explicit initializers should be in
// this same order but may be missing things.
SmallVector<const void*, 32> IdealInitKeys;

const CXXRecordDecl *ClassDecl = Constructor->getParent();

// 1. Virtual bases.
for (const auto &VBase : ClassDecl->vbases())
  IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType()));

// 2. Non-virtual bases.
for (const auto &Base : ClassDecl->bases()) {
  if (Base.isVirtual())
    continue;
  IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType()));
}

// 3. Direct fields.
for (auto *Field : ClassDecl->fields()) {
  if (Field->isUnnamedBitfield())
    continue;

  PopulateKeysForFields(Field, IdealInitKeys);
}

unsigned NumIdealInits = IdealInitKeys.size();
unsigned IdealIndex = 0;

CXXCtorInitializer *PrevInit = nullptr;
for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
  CXXCtorInitializer *Init = Inits[InitIndex];
  const void *InitKey = GetKeyForMember(SemaRef.Context, Init);

  // Scan forward to try to find this initializer in the idealized
  // initializers list.
  for (; IdealIndex != NumIdealInits; ++IdealIndex)
    if (InitKey == IdealInitKeys[IdealIndex])
      break;

  // If we didn't find this initializer, it must be because we
  // scanned past it on a previous iteration.  That can only
  // happen if we're out of order;  emit a warning.
  if (IdealIndex == NumIdealInits && PrevInit) {
    Sema::SemaDiagnosticBuilder D =
      SemaRef.Diag(PrevInit->getSourceLocation(),
                   diag::warn_initializer_out_of_order);

    if (PrevInit->isAnyMemberInitializer())
      D << 0 << PrevInit->getAnyMember()->getDeclName();
    else
      D << 1 << PrevInit->getTypeSourceInfo()->getType();

    if (Init->isAnyMemberInitializer())
      D << 0 << Init->getAnyMember()->getDeclName();
    else
      D << 1 << Init->getTypeSourceInfo()->getType();

    // Move back to the initializer's location in the ideal list.
    for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
      if (InitKey == IdealInitKeys[IdealIndex])
        break;

    assert(IdealIndex < NumIdealInits &&((IdealIndex < NumIdealInits && "initializer not found in initializer list"
) ? static_cast<void> (0) : __assert_fail ("IdealIndex < NumIdealInits && \"initializer not found in initializer list\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5006, __PRETTY_FUNCTION__))
           "initializer not found in initializer list")((IdealIndex < NumIdealInits && "initializer not found in initializer list"
) ? static_cast<void> (0) : __assert_fail ("IdealIndex < NumIdealInits && \"initializer not found in initializer list\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5006, __PRETTY_FUNCTION__));
  }

  PrevInit = Init;
}
5011}

5013namespace {
5014bool CheckRedundantInit(Sema &S,
                      CXXCtorInitializer *Init,
                      CXXCtorInitializer *&PrevInit) {
if (!PrevInit) {
  PrevInit = Init;
  return false;
}

if (FieldDecl *Field = Init->getAnyMember())
  S.Diag(Init->getSourceLocation(),
         diag::err_multiple_mem_initialization)
    << Field->getDeclName()
    << Init->getSourceRange();
else {
  const Type *BaseClass = Init->getBaseClass();
  assert(BaseClass && "neither field nor base")((BaseClass && "neither field nor base") ? static_cast
<void> (0) : __assert_fail ("BaseClass && \"neither field nor base\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5029, __PRETTY_FUNCTION__));
  S.Diag(Init->getSourceLocation(),
         diag::err_multiple_base_initialization)
    << QualType(BaseClass, 0)
    << Init->getSourceRange();
}
S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
  << 0 << PrevInit->getSourceRange();

return true;
5039}

5041typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
5042typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;

5044bool CheckRedundantUnionInit(Sema &S,
                           CXXCtorInitializer *Init,
                           RedundantUnionMap &Unions) {
FieldDecl *Field = Init->getAnyMember();
RecordDecl *Parent = Field->getParent();
NamedDecl *Child = Field;

while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) {
  if (Parent->isUnion()) {
    UnionEntry &En = Unions[Parent];
    if (En.first && En.first != Child) {
      S.Diag(Init->getSourceLocation(),
             diag::err_multiple_mem_union_initialization)
        << Field->getDeclName()
        << Init->getSourceRange();
      S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
        << 0 << En.second->getSourceRange();
      return true;
    }
    if (!En.first) {
      En.first = Child;
      En.second = Init;
    }
    if (!Parent->isAnonymousStructOrUnion())
      return false;
  }

  Child = Parent;
  Parent = cast<RecordDecl>(Parent->getDeclContext());
}

return false;
5076}
5077}

5079/// ActOnMemInitializers - Handle the member initializers for a constructor.
5080void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
                              SourceLocation ColonLoc,
                              ArrayRef<CXXCtorInitializer*> MemInits,
                              bool AnyErrors) {
if (!ConstructorDecl)
  return;

AdjustDeclIfTemplate(ConstructorDecl);

CXXConstructorDecl *Constructor
  = dyn_cast<CXXConstructorDecl>(ConstructorDecl);

if (!Constructor) {
  Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
  return;
}

// Mapping for the duplicate initializers check.
// For member initializers, this is keyed with a FieldDecl*.
// For base initializers, this is keyed with a Type*.
llvm::DenseMap<const void *, CXXCtorInitializer *> Members;

// Mapping for the inconsistent anonymous-union initializers check.
RedundantUnionMap MemberUnions;

bool HadError = false;
for (unsigned i = 0; i < MemInits.size(); i++) {
  CXXCtorInitializer *Init = MemInits[i];

  // Set the source order index.
  Init->setSourceOrder(i);

  if (Init->isAnyMemberInitializer()) {
    const void *Key = GetKeyForMember(Context, Init);
    if (CheckRedundantInit(*this, Init, Members[Key]) ||
        CheckRedundantUnionInit(*this, Init, MemberUnions))
      HadError = true;
  } else if (Init->isBaseInitializer()) {
    const void *Key = GetKeyForMember(Context, Init);
    if (CheckRedundantInit(*this, Init, Members[Key]))
      HadError = true;
  } else {
    assert(Init->isDelegatingInitializer())((Init->isDelegatingInitializer()) ? static_cast<void>
 (0) : __assert_fail ("Init->isDelegatingInitializer()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5122, __PRETTY_FUNCTION__));
    // This must be the only initializer
    if (MemInits.size() != 1) {
      Diag(Init->getSourceLocation(),
           diag::err_delegating_initializer_alone)
        << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange();
      // We will treat this as being the only initializer.
    }
    SetDelegatingInitializer(Constructor, MemInits[i]);
    // Return immediately as the initializer is set.
    return;
  }
}

if (HadError)
  return;

DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits);

SetCtorInitializers(Constructor, AnyErrors, MemInits);

DiagnoseUninitializedFields(*this, Constructor);
5144}

5146void
5147Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
                                           CXXRecordDecl *ClassDecl) {
// Ignore dependent contexts. Also ignore unions, since their members never
// have destructors implicitly called.
if (ClassDecl->isDependentContext() || ClassDecl->isUnion())
  return;

// FIXME: all the access-control diagnostics are positioned on the
// field/base declaration.  That's probably good; that said, the
// user might reasonably want to know why the destructor is being
// emitted, and we currently don't say.

// Non-static data members.
for (auto *Field : ClassDecl->fields()) {
  if (Field->isInvalidDecl())
    continue;

  // Don't destroy incomplete or zero-length arrays.
  if (isIncompleteOrZeroLengthArrayType(Context, Field->getType()))
    continue;

  QualType FieldType = Context.getBaseElementType(Field->getType());

  const RecordType* RT = FieldType->getAs<RecordType>();
  if (!RT)
    continue;

  CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
  if (FieldClassDecl->isInvalidDecl())
    continue;
  if (FieldClassDecl->hasIrrelevantDestructor())
    continue;
  // The destructor for an implicit anonymous union member is never invoked.
  if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
    continue;

  CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
  assert(Dtor && "No dtor found for FieldClassDecl!")((Dtor && "No dtor found for FieldClassDecl!") ? static_cast
<void> (0) : __assert_fail ("Dtor && \"No dtor found for FieldClassDecl!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5184, __PRETTY_FUNCTION__));
  CheckDestructorAccess(Field->getLocation(), Dtor,
                        PDiag(diag::err_access_dtor_field)
                          << Field->getDeclName()
                          << FieldType);

  MarkFunctionReferenced(Location, Dtor);
  DiagnoseUseOfDecl(Dtor, Location);
}

// We only potentially invoke the destructors of potentially constructed
// subobjects.
bool VisitVirtualBases = !ClassDecl->isAbstract();

llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;

// Bases.
for (const auto &Base : ClassDecl->bases()) {
  // Bases are always records in a well-formed non-dependent class.
  const RecordType *RT = Base.getType()->getAs<RecordType>();

  // Remember direct virtual bases.
  if (Base.isVirtual()) {
    if (!VisitVirtualBases)
      continue;
    DirectVirtualBases.insert(RT);
  }

  CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
  // If our base class is invalid, we probably can't get its dtor anyway.
  if (BaseClassDecl->isInvalidDecl())
    continue;
  if (BaseClassDecl->hasIrrelevantDestructor())
    continue;

  CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
  assert(Dtor && "No dtor found for BaseClassDecl!")((Dtor && "No dtor found for BaseClassDecl!") ? static_cast
<void> (0) : __assert_fail ("Dtor && \"No dtor found for BaseClassDecl!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5220, __PRETTY_FUNCTION__));

  // FIXME: caret should be on the start of the class name
  CheckDestructorAccess(Base.getBeginLoc(), Dtor,
                        PDiag(diag::err_access_dtor_base)
                            << Base.getType() << Base.getSourceRange(),
                        Context.getTypeDeclType(ClassDecl));

  MarkFunctionReferenced(Location, Dtor);
  DiagnoseUseOfDecl(Dtor, Location);
}

if (!VisitVirtualBases)
  return;

// Virtual bases.
for (const auto &VBase : ClassDecl->vbases()) {
  // Bases are always records in a well-formed non-dependent class.
  const RecordType *RT = VBase.getType()->castAs<RecordType>();

  // Ignore direct virtual bases.
  if (DirectVirtualBases.count(RT))
    continue;

  CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
  // If our base class is invalid, we probably can't get its dtor anyway.
  if (BaseClassDecl->isInvalidDecl())
    continue;
  if (BaseClassDecl->hasIrrelevantDestructor())
    continue;

  CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
  assert(Dtor && "No dtor found for BaseClassDecl!")((Dtor && "No dtor found for BaseClassDecl!") ? static_cast
<void> (0) : __assert_fail ("Dtor && \"No dtor found for BaseClassDecl!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5252, __PRETTY_FUNCTION__));
  if (CheckDestructorAccess(
          ClassDecl->getLocation(), Dtor,
          PDiag(diag::err_access_dtor_vbase)
              << Context.getTypeDeclType(ClassDecl) << VBase.getType(),
          Context.getTypeDeclType(ClassDecl)) ==
      AR_accessible) {
    CheckDerivedToBaseConversion(
        Context.getTypeDeclType(ClassDecl), VBase.getType(),
        diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(),
        SourceRange(), DeclarationName(), nullptr);
  }

  MarkFunctionReferenced(Location, Dtor);
  DiagnoseUseOfDecl(Dtor, Location);
}
5268}

5270void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
if (!CDtorDecl)
  return;

if (CXXConstructorDecl *Constructor
    = dyn_cast<CXXConstructorDecl>(CDtorDecl)) {
  SetCtorInitializers(Constructor, /*AnyErrors=*/false);
  DiagnoseUninitializedFields(*this, Constructor);
}
5279}

5281bool Sema::isAbstractType(SourceLocation Loc, QualType T) {
if (!getLangOpts().CPlusPlus)
  return false;

const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl();
if (!RD)
  return false;

// FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a
// class template specialization here, but doing so breaks a lot of code.

// We can't answer whether something is abstract until it has a
// definition. If it's currently being defined, we'll walk back
// over all the declarations when we have a full definition.
const CXXRecordDecl *Def = RD->getDefinition();
if (!Def || Def->isBeingDefined())
  return false;

return RD->isAbstract();
5300}

5302bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
                                TypeDiagnoser &Diagnoser) {
if (!isAbstractType(Loc, T))
  return false;

T = Context.getBaseElementType(T);
Diagnoser.diagnose(*this, Loc, T);
DiagnoseAbstractType(T->getAsCXXRecordDecl());
return true;
5311}

5313void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
// Check if we've already emitted the list of pure virtual functions
// for this class.
if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
  return;

// If the diagnostic is suppressed, don't emit the notes. We're only
// going to emit them once, so try to attach them to a diagnostic we're
// actually going to show.
if (Diags.isLastDiagnosticIgnored())
  return;

CXXFinalOverriderMap FinalOverriders;
RD->getFinalOverriders(FinalOverriders);

// Keep a set of seen pure methods so we won't diagnose the same method
// more than once.
llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;

for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
                                 MEnd = FinalOverriders.end();
     M != MEnd;
     ++M) {
  for (OverridingMethods::iterator SO = M->second.begin(),
                                SOEnd = M->second.end();
       SO != SOEnd; ++SO) {
    // C++ [class.abstract]p4:
    //   A class is abstract if it contains or inherits at least one
    //   pure virtual function for which the final overrider is pure
    //   virtual.

    //
    if (SO->second.size() != 1)
      continue;

    if (!SO->second.front().Method->isPure())
      continue;

    if (!SeenPureMethods.insert(SO->second.front().Method).second)
      continue;

    Diag(SO->second.front().Method->getLocation(),
         diag::note_pure_virtual_function)
      << SO->second.front().Method->getDeclName() << RD->getDeclName();
  }
}

if (!PureVirtualClassDiagSet)
  PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
PureVirtualClassDiagSet->insert(RD);
5363}

5365namespace {
5366struct AbstractUsageInfo {
Sema &S;
CXXRecordDecl *Record;
CanQualType AbstractType;
bool Invalid;

AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
  : S(S), Record(Record),
    AbstractType(S.Context.getCanonicalType(
                 S.Context.getTypeDeclType(Record))),
    Invalid(false) {}

void DiagnoseAbstractType() {
  if (Invalid) return;
  S.DiagnoseAbstractType(Record);
  Invalid = true;
}

void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
5385};

5387struct CheckAbstractUsage {
AbstractUsageInfo &Info;
const NamedDecl *Ctx;

CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
  : Info(Info), Ctx(Ctx) {}

void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
  switch (TL.getTypeLocClass()) {
5396#define ABSTRACT_TYPELOC(CLASS, PARENT)
5397#define TYPELOC(CLASS, PARENT) \
  case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break;
5399#include "clang/AST/TypeLocNodes.def"
  }
}

void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
  Visit(TL.getReturnLoc(), Sema::AbstractReturnType);
  for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) {
    if (!TL.getParam(I))
      continue;

    TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo();
    if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
  }
}

void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
  Visit(TL.getElementLoc(), Sema::AbstractArrayType);
}

void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
  // Visit the type parameters from a permissive context.
  for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
    TemplateArgumentLoc TAL = TL.getArgLoc(I);
    if (TAL.getArgument().getKind() == TemplateArgument::Type)
      if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
        Visit(TSI->getTypeLoc(), Sema::AbstractNone);
    // TODO: other template argument types?
  }
}

// Visit pointee types from a permissive context.
5430#define CheckPolymorphic(Type)void Check(Type TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc
(), Sema::AbstractNone); } \
void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
  Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
}
CheckPolymorphic(PointerTypeLoc)void Check(PointerTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit
(TL.getNextTypeLoc(), Sema::AbstractNone); }
CheckPolymorphic(ReferenceTypeLoc)void Check(ReferenceTypeLoc TL, Sema::AbstractDiagSelID Sel) {
 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); }
CheckPolymorphic(MemberPointerTypeLoc)void Check(MemberPointerTypeLoc TL, Sema::AbstractDiagSelID Sel
) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); }
CheckPolymorphic(BlockPointerTypeLoc)void Check(BlockPointerTypeLoc TL, Sema::AbstractDiagSelID Sel
) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); }
CheckPolymorphic(AtomicTypeLoc)void Check(AtomicTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit
(TL.getNextTypeLoc(), Sema::AbstractNone); }

/// Handle all the types we haven't given a more specific
/// implementation for above.
void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
  // Every other kind of type that we haven't called out already
  // that has an inner type is either (1) sugar or (2) contains that
  // inner type in some way as a subobject.
  if (TypeLoc Next = TL.getNextTypeLoc())
    return Visit(Next, Sel);

  // If there's no inner type and we're in a permissive context,
  // don't diagnose.
  if (Sel == Sema::AbstractNone) return;

  // Check whether the type matches the abstract type.
  QualType T = TL.getType();
  if (T->isArrayType()) {
    Sel = Sema::AbstractArrayType;
    T = Info.S.Context.getBaseElementType(T);
  }
  CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
  if (CT != Info.AbstractType) return;

  // It matched; do some magic.
  if (Sel == Sema::AbstractArrayType) {
    Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
      << T << TL.getSourceRange();
  } else {
    Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
      << Sel << T << TL.getSourceRange();
  }
  Info.DiagnoseAbstractType();
}
5472};

5474void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
                                Sema::AbstractDiagSelID Sel) {
CheckAbstractUsage(*this, D).Visit(TL, Sel);
5477}

5479}

5481/// Check for invalid uses of an abstract type in a method declaration.
5482static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
                                  CXXMethodDecl *MD) {
// No need to do the check on definitions, which require that
// the return/param types be complete.
if (MD->doesThisDeclarationHaveABody())
  return;

// For safety's sake, just ignore it if we don't have type source
// information.  This should never happen for non-implicit methods,
// but...
if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
  Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
5494}

5496/// Check for invalid uses of an abstract type within a class definition.
5497static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
                                  CXXRecordDecl *RD) {
for (auto *D : RD->decls()) {
  if (D->isImplicit()) continue;

  // Methods and method templates.
  if (isa<CXXMethodDecl>(D)) {
    CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
  } else if (isa<FunctionTemplateDecl>(D)) {
    FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
    CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));

  // Fields and static variables.
  } else if (isa<FieldDecl>(D)) {
    FieldDecl *FD = cast<FieldDecl>(D);
    if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
      Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
  } else if (isa<VarDecl>(D)) {
    VarDecl *VD = cast<VarDecl>(D);
    if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
      Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);

  // Nested classes and class templates.
  } else if (isa<CXXRecordDecl>(D)) {
    CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
  } else if (isa<ClassTemplateDecl>(D)) {
    CheckAbstractClassUsage(Info,
                           cast<ClassTemplateDecl>(D)->getTemplatedDecl());
  }
}
5527}

5529static void ReferenceDllExportedMembers(Sema &S, CXXRecordDecl *Class) {
Attr *ClassAttr = getDLLAttr(Class);
if (!ClassAttr)
  return;

assert(ClassAttr->getKind() == attr::DLLExport)((ClassAttr->getKind() == attr::DLLExport) ? static_cast<
void> (0) : __assert_fail ("ClassAttr->getKind() == attr::DLLExport"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5534, __PRETTY_FUNCTION__));

TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();

if (TSK == TSK_ExplicitInstantiationDeclaration)
  // Don't go any further if this is just an explicit instantiation
  // declaration.
  return;

if (S.Context.getTargetInfo().getTriple().isWindowsGNUEnvironment())
  S.MarkVTableUsed(Class->getLocation(), Class, true);

for (Decl *Member : Class->decls()) {
  // Defined static variables that are members of an exported base
  // class must be marked export too.
  auto *VD = dyn_cast<VarDecl>(Member);
  if (VD && Member->getAttr<DLLExportAttr>() &&
      VD->getStorageClass() == SC_Static &&
      TSK == TSK_ImplicitInstantiation)
    S.MarkVariableReferenced(VD->getLocation(), VD);

  auto *MD = dyn_cast<CXXMethodDecl>(Member);
  if (!MD)
    continue;

  if (Member->getAttr<DLLExportAttr>()) {
    if (MD->isUserProvided()) {
      // Instantiate non-default class member functions ...

      // .. except for certain kinds of template specializations.
      if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited())
        continue;

      S.MarkFunctionReferenced(Class->getLocation(), MD);

      // The function will be passed to the consumer when its definition is
      // encountered.
    } else if (!MD->isTrivial() || MD->isExplicitlyDefaulted() ||
               MD->isCopyAssignmentOperator() ||
               MD->isMoveAssignmentOperator()) {
      // Synthesize and instantiate non-trivial implicit methods, explicitly
      // defaulted methods, and the copy and move assignment operators. The
      // latter are exported even if they are trivial, because the address of
      // an operator can be taken and should compare equal across libraries.
      DiagnosticErrorTrap Trap(S.Diags);
      S.MarkFunctionReferenced(Class->getLocation(), MD);
      if (Trap.hasErrorOccurred()) {
        S.Diag(ClassAttr->getLocation(), diag::note_due_to_dllexported_class)
            << Class << !S.getLangOpts().CPlusPlus11;
        break;
      }

      // There is no later point when we will see the definition of this
      // function, so pass it to the consumer now.
      S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD));
    }
  }
}
5592}

5594static void checkForMultipleExportedDefaultConstructors(Sema &S,
                                                      CXXRecordDecl *Class) {
// Only the MS ABI has default constructor closures, so we don't need to do
// this semantic checking anywhere else.
if (!S.Context.getTargetInfo().getCXXABI().isMicrosoft())
  return;

CXXConstructorDecl *LastExportedDefaultCtor = nullptr;
for (Decl *Member : Class->decls()) {
  // Look for exported default constructors.
  auto *CD = dyn_cast<CXXConstructorDecl>(Member);
  if (!CD || !CD->isDefaultConstructor())
    continue;
  auto *Attr = CD->getAttr<DLLExportAttr>();
  if (!Attr)
    continue;

  // If the class is non-dependent, mark the default arguments as ODR-used so
  // that we can properly codegen the constructor closure.
  if (!Class->isDependentContext()) {
    for (ParmVarDecl *PD : CD->parameters()) {
      (void)S.CheckCXXDefaultArgExpr(Attr->getLocation(), CD, PD);
      S.DiscardCleanupsInEvaluationContext();
    }
  }

  if (LastExportedDefaultCtor) {
    S.Diag(LastExportedDefaultCtor->getLocation(),
           diag::err_attribute_dll_ambiguous_default_ctor)
        << Class;
    S.Diag(CD->getLocation(), diag::note_entity_declared_at)
        << CD->getDeclName();
    return;
  }
  LastExportedDefaultCtor = CD;
}
5630}

5632void Sema::checkClassLevelCodeSegAttribute(CXXRecordDecl *Class) {
// Mark any compiler-generated routines with the implicit code_seg attribute.
for (auto *Method : Class->methods()) {
  if (Method->isUserProvided())
    continue;
  if (Attr *A = getImplicitCodeSegOrSectionAttrForFunction(Method, /*IsDefinition=*/true))
    Method->addAttr(A);
}
5640}

5642/// Check class-level dllimport/dllexport attribute.
5643void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) {
Attr *ClassAttr = getDLLAttr(Class);

// MSVC inherits DLL attributes to partial class template specializations.
if (Context.getTargetInfo().getCXXABI().isMicrosoft() && !ClassAttr) {
  if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) {
    if (Attr *TemplateAttr =
            getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) {
      auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext()));
      A->setInherited(true);
      ClassAttr = A;
    }
  }
}

if (!ClassAttr)
  return;

if (!Class->isExternallyVisible()) {
  Diag(Class->getLocation(), diag::err_attribute_dll_not_extern)
      << Class << ClassAttr;
  return;
}

if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
    !ClassAttr->isInherited()) {
  // Diagnose dll attributes on members of class with dll attribute.
  for (Decl *Member : Class->decls()) {
    if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member))
      continue;
    InheritableAttr *MemberAttr = getDLLAttr(Member);
    if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl())
      continue;

    Diag(MemberAttr->getLocation(),
           diag::err_attribute_dll_member_of_dll_class)
        << MemberAttr << ClassAttr;
    Diag(ClassAttr->getLocation(), diag::note_previous_attribute);
    Member->setInvalidDecl();
  }
}

if (Class->getDescribedClassTemplate())
  // Don't inherit dll attribute until the template is instantiated.
  return;

// The class is either imported or exported.
const bool ClassExported = ClassAttr->getKind() == attr::DLLExport;

// Check if this was a dllimport attribute propagated from a derived class to
// a base class template specialization. We don't apply these attributes to
// static data members.
const bool PropagatedImport =
    !ClassExported &&
    cast<DLLImportAttr>(ClassAttr)->wasPropagatedToBaseTemplate();

TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();

// Ignore explicit dllexport on explicit class template instantiation
// declarations, except in MinGW mode.
if (ClassExported && !ClassAttr->isInherited() &&
    TSK == TSK_ExplicitInstantiationDeclaration &&
    !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) {
  Class->dropAttr<DLLExportAttr>();
  return;
}

// Force declaration of implicit members so they can inherit the attribute.
ForceDeclarationOfImplicitMembers(Class);

// FIXME: MSVC's docs say all bases must be exportable, but this doesn't
// seem to be true in practice?

for (Decl *Member : Class->decls()) {
  VarDecl *VD = dyn_cast<VarDecl>(Member);
  CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member);

  // Only methods and static fields inherit the attributes.
  if (!VD && !MD)
    continue;

  if (MD) {
    // Don't process deleted methods.
    if (MD->isDeleted())
      continue;

    if (MD->isInlined()) {
      // MinGW does not import or export inline methods. But do it for
      // template instantiations.
      if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
          !Context.getTargetInfo().getTriple().isWindowsItaniumEnvironment() &&
          TSK != TSK_ExplicitInstantiationDeclaration &&
          TSK != TSK_ExplicitInstantiationDefinition)
        continue;

      // MSVC versions before 2015 don't export the move assignment operators
      // and move constructor, so don't attempt to import/export them if
      // we have a definition.
      auto *Ctor = dyn_cast<CXXConstructorDecl>(MD);
      if ((MD->isMoveAssignmentOperator() ||
           (Ctor && Ctor->isMoveConstructor())) &&
          !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015))
        continue;

      // MSVC2015 doesn't export trivial defaulted x-tor but copy assign
      // operator is exported anyway.
      if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
          (Ctor || isa<CXXDestructorDecl>(MD)) && MD->isTrivial())
        continue;
    }
  }

  // Don't apply dllimport attributes to static data members of class template
  // instantiations when the attribute is propagated from a derived class.
  if (VD && PropagatedImport)
    continue;

  if (!cast<NamedDecl>(Member)->isExternallyVisible())
    continue;

  if (!getDLLAttr(Member)) {
    InheritableAttr *NewAttr = nullptr;

    // Do not export/import inline function when -fno-dllexport-inlines is
    // passed. But add attribute for later local static var check.
    if (!getLangOpts().DllExportInlines && MD && MD->isInlined() &&
        TSK != TSK_ExplicitInstantiationDeclaration &&
        TSK != TSK_ExplicitInstantiationDefinition) {
      if (ClassExported) {
        NewAttr = ::new (getASTContext())
          DLLExportStaticLocalAttr(ClassAttr->getRange(),
                                   getASTContext(),
                                   ClassAttr->getSpellingListIndex());
      } else {
        NewAttr = ::new (getASTContext())
          DLLImportStaticLocalAttr(ClassAttr->getRange(),
                                   getASTContext(),
                                   ClassAttr->getSpellingListIndex());
      }
    } else {
      NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
    }

    NewAttr->setInherited(true);
    Member->addAttr(NewAttr);

    if (MD) {
      // Propagate DLLAttr to friend re-declarations of MD that have already
      // been constructed.
      for (FunctionDecl *FD = MD->getMostRecentDecl(); FD;
           FD = FD->getPreviousDecl()) {
        if (FD->getFriendObjectKind() == Decl::FOK_None)
          continue;
        assert(!getDLLAttr(FD) &&((!getDLLAttr(FD) && "friend re-decl should not already have a DLLAttr"
) ? static_cast<void> (0) : __assert_fail ("!getDLLAttr(FD) && \"friend re-decl should not already have a DLLAttr\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5797, __PRETTY_FUNCTION__))
               "friend re-decl should not already have a DLLAttr")((!getDLLAttr(FD) && "friend re-decl should not already have a DLLAttr"
) ? static_cast<void> (0) : __assert_fail ("!getDLLAttr(FD) && \"friend re-decl should not already have a DLLAttr\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5797, __PRETTY_FUNCTION__));
        NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
        NewAttr->setInherited(true);
        FD->addAttr(NewAttr);
      }
    }
  }
}

if (ClassExported)
  DelayedDllExportClasses.push_back(Class);
5808}

5810/// Perform propagation of DLL attributes from a derived class to a
5811/// templated base class for MS compatibility.
5812void Sema::propagateDLLAttrToBaseClassTemplate(
  CXXRecordDecl *Class, Attr *ClassAttr,
  ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc) {
if (getDLLAttr(
        BaseTemplateSpec->getSpecializedTemplate()->getTemplatedDecl())) {
  // If the base class template has a DLL attribute, don't try to change it.
  return;
}

auto TSK = BaseTemplateSpec->getSpecializationKind();
if (!getDLLAttr(BaseTemplateSpec) &&
    (TSK == TSK_Undeclared || TSK == TSK_ExplicitInstantiationDeclaration ||
     TSK == TSK_ImplicitInstantiation)) {
  // The template hasn't been instantiated yet (or it has, but only as an
  // explicit instantiation declaration or implicit instantiation, which means
  // we haven't codegenned any members yet), so propagate the attribute.
  auto *NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
  NewAttr->setInherited(true);
  BaseTemplateSpec->addAttr(NewAttr);

  // If this was an import, mark that we propagated it from a derived class to
  // a base class template specialization.
  if (auto *ImportAttr = dyn_cast<DLLImportAttr>(NewAttr))
    ImportAttr->setPropagatedToBaseTemplate();

  // If the template is already instantiated, checkDLLAttributeRedeclaration()
  // needs to be run again to work see the new attribute. Otherwise this will
  // get run whenever the template is instantiated.
  if (TSK != TSK_Undeclared)
    checkClassLevelDLLAttribute(BaseTemplateSpec);

  return;
}

if (getDLLAttr(BaseTemplateSpec)) {
  // The template has already been specialized or instantiated with an
  // attribute, explicitly or through propagation. We should not try to change
  // it.
  return;
}

// The template was previously instantiated or explicitly specialized without
// a dll attribute, It's too late for us to add an attribute, so warn that
// this is unsupported.
Diag(BaseLoc, diag::warn_attribute_dll_instantiated_base_class)
    << BaseTemplateSpec->isExplicitSpecialization();
Diag(ClassAttr->getLocation(), diag::note_attribute);
if (BaseTemplateSpec->isExplicitSpecialization()) {
  Diag(BaseTemplateSpec->getLocation(),
         diag::note_template_class_explicit_specialization_was_here)
      << BaseTemplateSpec;
} else {
  Diag(BaseTemplateSpec->getPointOfInstantiation(),
         diag::note_template_class_instantiation_was_here)
      << BaseTemplateSpec;
}
5868}

5870static void DefineImplicitSpecialMember(Sema &S, CXXMethodDecl *MD,
                                      SourceLocation DefaultLoc) {
switch (S.getSpecialMember(MD)) {
case Sema::CXXDefaultConstructor:
  S.DefineImplicitDefaultConstructor(DefaultLoc,
                                     cast<CXXConstructorDecl>(MD));
  break;
case Sema::CXXCopyConstructor:
  S.DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
  break;
case Sema::CXXCopyAssignment:
  S.DefineImplicitCopyAssignment(DefaultLoc, MD);
  break;
case Sema::CXXDestructor:
  S.DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD));
  break;
case Sema::CXXMoveConstructor:
  S.DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
  break;
case Sema::CXXMoveAssignment:
  S.DefineImplicitMoveAssignment(DefaultLoc, MD);
  break;
case Sema::CXXInvalid:
  llvm_unreachable("Invalid special member.")::llvm::llvm_unreachable_internal("Invalid special member.", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5893);
}
5895}

5897/// Determine whether a type is permitted to be passed or returned in
5898/// registers, per C++ [class.temporary]p3.
5899static bool canPassInRegisters(Sema &S, CXXRecordDecl *D,
                             TargetInfo::CallingConvKind CCK) {
if (D->isDependentType() || D->isInvalidDecl())
  return false;

// Clang <= 4 used the pre-C++11 rule, which ignores move operations.
// The PS4 platform ABI follows the behavior of Clang 3.2.
if (CCK == TargetInfo::CCK_ClangABI4OrPS4)
  return !D->hasNonTrivialDestructorForCall() &&
         !D->hasNonTrivialCopyConstructorForCall();

if (CCK == TargetInfo::CCK_MicrosoftWin64) {
  bool CopyCtorIsTrivial = false, CopyCtorIsTrivialForCall = false;
  bool DtorIsTrivialForCall = false;

  // If a class has at least one non-deleted, trivial copy constructor, it
  // is passed according to the C ABI. Otherwise, it is passed indirectly.
  //
  // Note: This permits classes with non-trivial copy or move ctors to be
  // passed in registers, so long as they *also* have a trivial copy ctor,
  // which is non-conforming.
  if (D->needsImplicitCopyConstructor()) {
    if (!D->defaultedCopyConstructorIsDeleted()) {
      if (D->hasTrivialCopyConstructor())
        CopyCtorIsTrivial = true;
      if (D->hasTrivialCopyConstructorForCall())
        CopyCtorIsTrivialForCall = true;
    }
  } else {
    for (const CXXConstructorDecl *CD : D->ctors()) {
      if (CD->isCopyConstructor() && !CD->isDeleted()) {
        if (CD->isTrivial())
          CopyCtorIsTrivial = true;
        if (CD->isTrivialForCall())
          CopyCtorIsTrivialForCall = true;
      }
    }
  }

  if (D->needsImplicitDestructor()) {
    if (!D->defaultedDestructorIsDeleted() &&
        D->hasTrivialDestructorForCall())
      DtorIsTrivialForCall = true;
  } else if (const auto *DD = D->getDestructor()) {
    if (!DD->isDeleted() && DD->isTrivialForCall())
      DtorIsTrivialForCall = true;
  }

  // If the copy ctor and dtor are both trivial-for-calls, pass direct.
  if (CopyCtorIsTrivialForCall && DtorIsTrivialForCall)
    return true;

  // If a class has a destructor, we'd really like to pass it indirectly
  // because it allows us to elide copies.  Unfortunately, MSVC makes that
  // impossible for small types, which it will pass in a single register or
  // stack slot. Most objects with dtors are large-ish, so handle that early.
  // We can't call out all large objects as being indirect because there are
  // multiple x64 calling conventions and the C++ ABI code shouldn't dictate
  // how we pass large POD types.

  // Note: This permits small classes with nontrivial destructors to be
  // passed in registers, which is non-conforming.
  bool isAArch64 = S.Context.getTargetInfo().getTriple().isAArch64();
  uint64_t TypeSize = isAArch64 ? 128 : 64;

  if (CopyCtorIsTrivial &&
      S.getASTContext().getTypeSize(D->getTypeForDecl()) <= TypeSize)
    return true;
  return false;
}

// Per C++ [class.temporary]p3, the relevant condition is:
//   each copy constructor, move constructor, and destructor of X is
//   either trivial or deleted, and X has at least one non-deleted copy
//   or move constructor
bool HasNonDeletedCopyOrMove = false;

if (D->needsImplicitCopyConstructor() &&
    !D->defaultedCopyConstructorIsDeleted()) {
  if (!D->hasTrivialCopyConstructorForCall())
    return false;
  HasNonDeletedCopyOrMove = true;
}

if (S.getLangOpts().CPlusPlus11 && D->needsImplicitMoveConstructor() &&
    !D->defaultedMoveConstructorIsDeleted()) {
  if (!D->hasTrivialMoveConstructorForCall())
    return false;
  HasNonDeletedCopyOrMove = true;
}

if (D->needsImplicitDestructor() && !D->defaultedDestructorIsDeleted() &&
    !D->hasTrivialDestructorForCall())
  return false;

for (const CXXMethodDecl *MD : D->methods()) {
  if (MD->isDeleted())
    continue;

  auto *CD = dyn_cast<CXXConstructorDecl>(MD);
  if (CD && CD->isCopyOrMoveConstructor())
    HasNonDeletedCopyOrMove = true;
  else if (!isa<CXXDestructorDecl>(MD))
    continue;

  if (!MD->isTrivialForCall())
    return false;
}

return HasNonDeletedCopyOrMove;
6009}

6011/// Perform semantic checks on a class definition that has been
6012/// completing, introducing implicitly-declared members, checking for
6013/// abstract types, etc.
6014void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
if (!Record)
  return;

if (Record->isAbstract() && !Record->isInvalidDecl()) {
  AbstractUsageInfo Info(*this, Record);
  CheckAbstractClassUsage(Info, Record);
}

// If this is not an aggregate type and has no user-declared constructor,
// complain about any non-static data members of reference or const scalar
// type, since they will never get initializers.
if (!Record->isInvalidDecl() && !Record->isDependentType() &&
    !Record->isAggregate() && !Record->hasUserDeclaredConstructor() &&
    !Record->isLambda()) {
  bool Complained = false;
  for (const auto *F : Record->fields()) {
    if (F->hasInClassInitializer() || F->isUnnamedBitfield())
      continue;

    if (F->getType()->isReferenceType() ||
        (F->getType().isConstQualified() && F->getType()->isScalarType())) {
      if (!Complained) {
        Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
          << Record->getTagKind() << Record;
        Complained = true;
      }

      Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
        << F->getType()->isReferenceType()
        << F->getDeclName();
    }
  }
}

if (Record->getIdentifier()) {
  // C++ [class.mem]p13:
  //   If T is the name of a class, then each of the following shall have a
  //   name different from T:
  //     - every member of every anonymous union that is a member of class T.
  //
  // C++ [class.mem]p14:
  //   In addition, if class T has a user-declared constructor (12.1), every
  //   non-static data member of class T shall have a name different from T.
  DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
  for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
       ++I) {
    NamedDecl *D = (*I)->getUnderlyingDecl();
    if (((isa<FieldDecl>(D) || isa<UnresolvedUsingValueDecl>(D)) &&
         Record->hasUserDeclaredConstructor()) ||
        isa<IndirectFieldDecl>(D)) {
      Diag((*I)->getLocation(), diag::err_member_name_of_class)
        << D->getDeclName();
      break;
    }
  }
}

// Warn if the class has virtual methods but non-virtual public destructor.
if (Record->isPolymorphic() && !Record->isDependentType()) {
  CXXDestructorDecl *dtor = Record->getDestructor();
  if ((!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) &&
      !Record->hasAttr<FinalAttr>())
    Diag(dtor ? dtor->getLocation() : Record->getLocation(),
         diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
}

if (Record->isAbstract()) {
  if (FinalAttr *FA = Record->getAttr<FinalAttr>()) {
    Diag(Record->getLocation(), diag::warn_abstract_final_class)
      << FA->isSpelledAsSealed();
    DiagnoseAbstractType(Record);
  }
}

// See if trivial_abi has to be dropped.
if (Record->hasAttr<TrivialABIAttr>())
  checkIllFormedTrivialABIStruct(*Record);

// Set HasTrivialSpecialMemberForCall if the record has attribute
// "trivial_abi".
bool HasTrivialABI = Record->hasAttr<TrivialABIAttr>();

if (HasTrivialABI)
  Record->setHasTrivialSpecialMemberForCall();

bool HasMethodWithOverrideControl = false,
     HasOverridingMethodWithoutOverrideControl = false;
if (!Record->isDependentType()) {
  for (auto *M : Record->methods()) {
    // See if a method overloads virtual methods in a base
    // class without overriding any.
    if (!M->isStatic())
      DiagnoseHiddenVirtualMethods(M);
    if (M->hasAttr<OverrideAttr>())
      HasMethodWithOverrideControl = true;
    else if (M->size_overridden_methods() > 0)
      HasOverridingMethodWithoutOverrideControl = true;
    // Check whether the explicitly-defaulted special members are valid.
    if (!M->isInvalidDecl() && M->isExplicitlyDefaulted())
      CheckExplicitlyDefaultedSpecialMember(M);

    // For an explicitly defaulted or deleted special member, we defer
    // determining triviality until the class is complete. That time is now!
    CXXSpecialMember CSM = getSpecialMember(M);
    if (!M->isImplicit() && !M->isUserProvided()) {
      if (CSM != CXXInvalid) {
        M->setTrivial(SpecialMemberIsTrivial(M, CSM));
        // Inform the class that we've finished declaring this member.
        Record->finishedDefaultedOrDeletedMember(M);
        M->setTrivialForCall(
            HasTrivialABI ||
            SpecialMemberIsTrivial(M, CSM, TAH_ConsiderTrivialABI));
        Record->setTrivialForCallFlags(M);
      }
    }

    // Set triviality for the purpose of calls if this is a user-provided
    // copy/move constructor or destructor.
    if ((CSM == CXXCopyConstructor || CSM == CXXMoveConstructor ||
         CSM == CXXDestructor) && M->isUserProvided()) {
      M->setTrivialForCall(HasTrivialABI);
      Record->setTrivialForCallFlags(M);
    }

    if (!M->isInvalidDecl() && M->isExplicitlyDefaulted() &&
        M->hasAttr<DLLExportAttr>()) {
      if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
          M->isTrivial() &&
          (CSM == CXXDefaultConstructor || CSM == CXXCopyConstructor ||
           CSM == CXXDestructor))
        M->dropAttr<DLLExportAttr>();

      if (M->hasAttr<DLLExportAttr>()) {
        DefineImplicitSpecialMember(*this, M, M->getLocation());
        ActOnFinishInlineFunctionDef(M);
      }
    }
  }
}

if (HasMethodWithOverrideControl &&
    HasOverridingMethodWithoutOverrideControl) {
  // At least one method has the 'override' control declared.
  // Diagnose all other overridden methods which do not have 'override' specified on them.
  for (auto *M : Record->methods())
    DiagnoseAbsenceOfOverrideControl(M);
}

// ms_struct is a request to use the same ABI rules as MSVC.  Check
// whether this class uses any C++ features that are implemented
// completely differently in MSVC, and if so, emit a diagnostic.
// That diagnostic defaults to an error, but we allow projects to
// map it down to a warning (or ignore it).  It's a fairly common
// practice among users of the ms_struct pragma to mass-annotate
// headers, sweeping up a bunch of types that the project doesn't
// really rely on MSVC-compatible layout for.  We must therefore
// support "ms_struct except for C++ stuff" as a secondary ABI.
if (Record->isMsStruct(Context) &&
    (Record->isPolymorphic() || Record->getNumBases())) {
  Diag(Record->getLocation(), diag::warn_cxx_ms_struct);
}

checkClassLevelDLLAttribute(Record);
checkClassLevelCodeSegAttribute(Record);

bool ClangABICompat4 =
    Context.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver4;
TargetInfo::CallingConvKind CCK =
    Context.getTargetInfo().getCallingConvKind(ClangABICompat4);
bool CanPass = canPassInRegisters(*this, Record, CCK);

// Do not change ArgPassingRestrictions if it has already been set to
// APK_CanNeverPassInRegs.
if (Record->getArgPassingRestrictions() != RecordDecl::APK_CanNeverPassInRegs)
  Record->setArgPassingRestrictions(CanPass
                                        ? RecordDecl::APK_CanPassInRegs
                                        : RecordDecl::APK_CannotPassInRegs);

// If canPassInRegisters returns true despite the record having a non-trivial
// destructor, the record is destructed in the callee. This happens only when
// the record or one of its subobjects has a field annotated with trivial_abi
// or a field qualified with ObjC __strong/__weak.
if (Context.getTargetInfo().getCXXABI().areArgsDestroyedLeftToRightInCallee())
  Record->setParamDestroyedInCallee(true);
else if (Record->hasNonTrivialDestructor())
  Record->setParamDestroyedInCallee(CanPass);

if (getLangOpts().ForceEmitVTables) {
  // If we want to emit all the vtables, we need to mark it as used.  This
  // is especially required for cases like vtable assumption loads.
  MarkVTableUsed(Record->getInnerLocStart(), Record);
}
6207}

6209/// Look up the special member function that would be called by a special
6210/// member function for a subobject of class type.
6211///
6212/// \param Class The class type of the subobject.
6213/// \param CSM The kind of special member function.
6214/// \param FieldQuals If the subobject is a field, its cv-qualifiers.
6215/// \param ConstRHS True if this is a copy operation with a const object
6216///        on its RHS, that is, if the argument to the outer special member
6217///        function is 'const' and this is not a field marked 'mutable'.
6218static Sema::SpecialMemberOverloadResult lookupCallFromSpecialMember(
  Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM,
  unsigned FieldQuals, bool ConstRHS) {
unsigned LHSQuals = 0;
if (CSM == Sema::CXXCopyAssignment || CSM == Sema::CXXMoveAssignment)
  LHSQuals = FieldQuals;

unsigned RHSQuals = FieldQuals;
if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor)
  RHSQuals = 0;
else if (ConstRHS)
  RHSQuals |= Qualifiers::Const;

return S.LookupSpecialMember(Class, CSM,
                             RHSQuals & Qualifiers::Const,
                             RHSQuals & Qualifiers::Volatile,
                             false,
                             LHSQuals & Qualifiers::Const,
                             LHSQuals & Qualifiers::Volatile);
6237}

6239class Sema::InheritedConstructorInfo {
Sema &S;
SourceLocation UseLoc;

/// A mapping from the base classes through which the constructor was
/// inherited to the using shadow declaration in that base class (or a null
/// pointer if the constructor was declared in that base class).
llvm::DenseMap<CXXRecordDecl *, ConstructorUsingShadowDecl *>
    InheritedFromBases;

6249public:
InheritedConstructorInfo(Sema &S, SourceLocation UseLoc,
                         ConstructorUsingShadowDecl *Shadow)
    : S(S), UseLoc(UseLoc) {
  bool DiagnosedMultipleConstructedBases = false;
  CXXRecordDecl *ConstructedBase = nullptr;
  UsingDecl *ConstructedBaseUsing = nullptr;

  // Find the set of such base class subobjects and check that there's a
  // unique constructed subobject.
  for (auto *D : Shadow->redecls()) {
    auto *DShadow = cast<ConstructorUsingShadowDecl>(D);
    auto *DNominatedBase = DShadow->getNominatedBaseClass();
    auto *DConstructedBase = DShadow->getConstructedBaseClass();

    InheritedFromBases.insert(
        std::make_pair(DNominatedBase->getCanonicalDecl(),
                       DShadow->getNominatedBaseClassShadowDecl()));
    if (DShadow->constructsVirtualBase())
      InheritedFromBases.insert(
          std::make_pair(DConstructedBase->getCanonicalDecl(),
                         DShadow->getConstructedBaseClassShadowDecl()));
    else
      assert(DNominatedBase == DConstructedBase)((DNominatedBase == DConstructedBase) ? static_cast<void>
 (0) : __assert_fail ("DNominatedBase == DConstructedBase", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6272, __PRETTY_FUNCTION__));

    // [class.inhctor.init]p2:
    //   If the constructor was inherited from multiple base class subobjects
    //   of type B, the program is ill-formed.
    if (!ConstructedBase) {
      ConstructedBase = DConstructedBase;
      ConstructedBaseUsing = D->getUsingDecl();
    } else if (ConstructedBase != DConstructedBase &&
               !Shadow->isInvalidDecl()) {
      if (!DiagnosedMultipleConstructedBases) {
        S.Diag(UseLoc, diag::err_ambiguous_inherited_constructor)
            << Shadow->getTargetDecl();
        S.Diag(ConstructedBaseUsing->getLocation(),
             diag::note_ambiguous_inherited_constructor_using)
            << ConstructedBase;
        DiagnosedMultipleConstructedBases = true;
      }
      S.Diag(D->getUsingDecl()->getLocation(),
             diag::note_ambiguous_inherited_constructor_using)
          << DConstructedBase;
    }
  }

  if (DiagnosedMultipleConstructedBases)
    Shadow->setInvalidDecl();
}

/// Find the constructor to use for inherited construction of a base class,
/// and whether that base class constructor inherits the constructor from a
/// virtual base class (in which case it won't actually invoke it).
std::pair<CXXConstructorDecl *, bool>
findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const {
  auto It = InheritedFromBases.find(Base->getCanonicalDecl());
  if (It == InheritedFromBases.end())
    return std::make_pair(nullptr, false);

  // This is an intermediary class.
  if (It->second)
    return std::make_pair(
        S.findInheritingConstructor(UseLoc, Ctor, It->second),
        It->second->constructsVirtualBase());

  // This is the base class from which the constructor was inherited.
  return std::make_pair(Ctor, false);
}
6318};

6320/// Is the special member function which would be selected to perform the
6321/// specified operation on the specified class type a constexpr constructor?
6322static bool
6323specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
                       Sema::CXXSpecialMember CSM, unsigned Quals,
                       bool ConstRHS,
                       CXXConstructorDecl *InheritedCtor = nullptr,
                       Sema::InheritedConstructorInfo *Inherited = nullptr) {
// If we're inheriting a constructor, see if we need to call it for this base
// class.
if (InheritedCtor) {
  assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void>
 (0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6331, __PRETTY_FUNCTION__));
  auto BaseCtor =
      Inherited->findConstructorForBase(ClassDecl, InheritedCtor).first;
  if (BaseCtor)
    return BaseCtor->isConstexpr();
}

if (CSM == Sema::CXXDefaultConstructor)
  return ClassDecl->hasConstexprDefaultConstructor();

Sema::SpecialMemberOverloadResult SMOR =
    lookupCallFromSpecialMember(S, ClassDecl, CSM, Quals, ConstRHS);
if (!SMOR.getMethod())
  // A constructor we wouldn't select can't be "involved in initializing"
  // anything.
  return true;
return SMOR.getMethod()->isConstexpr();
6348}

6350/// Determine whether the specified special member function would be constexpr
6351/// if it were implicitly defined.
6352static bool defaultedSpecialMemberIsConstexpr(
  Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM,
  bool ConstArg, CXXConstructorDecl *InheritedCtor = nullptr,
  Sema::InheritedConstructorInfo *Inherited = nullptr) {
if (!S.getLangOpts().CPlusPlus11)
  return false;

// C++11 [dcl.constexpr]p4:
// In the definition of a constexpr constructor [...]
bool Ctor = true;
switch (CSM) {
case Sema::CXXDefaultConstructor:
  if (Inherited)
    break;
  // Since default constructor lookup is essentially trivial (and cannot
  // involve, for instance, template instantiation), we compute whether a
  // defaulted default constructor is constexpr directly within CXXRecordDecl.
  //
  // This is important for performance; we need to know whether the default
  // constructor is constexpr to determine whether the type is a literal type.
  return ClassDecl->defaultedDefaultConstructorIsConstexpr();

case Sema::CXXCopyConstructor:
case Sema::CXXMoveConstructor:
  // For copy or move constructors, we need to perform overload resolution.
  break;

case Sema::CXXCopyAssignment:
case Sema::CXXMoveAssignment:
  if (!S.getLangOpts().CPlusPlus14)
    return false;
  // In C++1y, we need to perform overload resolution.
  Ctor = false;
  break;

case Sema::CXXDestructor:
case Sema::CXXInvalid:
  return false;
}

//   -- if the class is a non-empty union, or for each non-empty anonymous
//      union member of a non-union class, exactly one non-static data member
//      shall be initialized; [DR1359]
//
// If we squint, this is guaranteed, since exactly one non-static data member
// will be initialized (if the constructor isn't deleted), we just don't know
// which one.
if (Ctor && ClassDecl->isUnion())
  return CSM == Sema::CXXDefaultConstructor
             ? ClassDecl->hasInClassInitializer() ||
                   !ClassDecl->hasVariantMembers()
             : true;

//   -- the class shall not have any virtual base classes;
if (Ctor && ClassDecl->getNumVBases())
  return false;

// C++1y [class.copy]p26:
//   -- [the class] is a literal type, and
if (!Ctor && !ClassDecl->isLiteral())
  return false;

//   -- every constructor involved in initializing [...] base class
//      sub-objects shall be a constexpr constructor;
//   -- the assignment operator selected to copy/move each direct base
//      class is a constexpr function, and
for (const auto &B : ClassDecl->bases()) {
  const RecordType *BaseType = B.getType()->getAs<RecordType>();
  if (!BaseType) continue;

  CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
  if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, 0, ConstArg,
                                InheritedCtor, Inherited))
    return false;
}

//   -- every constructor involved in initializing non-static data members
//      [...] shall be a constexpr constructor;
//   -- every non-static data member and base class sub-object shall be
//      initialized
//   -- for each non-static data member of X that is of class type (or array
//      thereof), the assignment operator selected to copy/move that member is
//      a constexpr function
for (const auto *F : ClassDecl->fields()) {
  if (F->isInvalidDecl())
    continue;
  if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer())
    continue;
  QualType BaseType = S.Context.getBaseElementType(F->getType());
  if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) {
    CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
    if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM,
                                  BaseType.getCVRQualifiers(),
                                  ConstArg && !F->isMutable()))
      return false;
  } else if (CSM == Sema::CXXDefaultConstructor) {
    return false;
  }
}

// All OK, it's constexpr!
return true;
6454}

6456static Sema::ImplicitExceptionSpecification
6457ComputeDefaultedSpecialMemberExceptionSpec(
  Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM,
  Sema::InheritedConstructorInfo *ICI);

6461static Sema::ImplicitExceptionSpecification
6462computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) {
auto CSM = S.getSpecialMember(MD);
if (CSM != Sema::CXXInvalid)
  return ComputeDefaultedSpecialMemberExceptionSpec(S, Loc, MD, CSM, nullptr);

auto *CD = cast<CXXConstructorDecl>(MD);
assert(CD->getInheritedConstructor() &&((CD->getInheritedConstructor() && "only special members have implicit exception specs"
) ? static_cast<void> (0) : __assert_fail ("CD->getInheritedConstructor() && \"only special members have implicit exception specs\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6469, __PRETTY_FUNCTION__))
       "only special members have implicit exception specs")((CD->getInheritedConstructor() && "only special members have implicit exception specs"
) ? static_cast<void> (0) : __assert_fail ("CD->getInheritedConstructor() && \"only special members have implicit exception specs\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6469, __PRETTY_FUNCTION__));
Sema::InheritedConstructorInfo ICI(
    S, Loc, CD->getInheritedConstructor().getShadowDecl());
return ComputeDefaultedSpecialMemberExceptionSpec(
    S, Loc, CD, Sema::CXXDefaultConstructor, &ICI);
6474}

6476static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S,
                                                          CXXMethodDecl *MD) {
FunctionProtoType::ExtProtoInfo EPI;

// Build an exception specification pointing back at this member.
EPI.ExceptionSpec.Type = EST_Unevaluated;
EPI.ExceptionSpec.SourceDecl = MD;

// Set the calling convention to the default for C++ instance methods.
EPI.ExtInfo = EPI.ExtInfo.withCallingConv(
    S.Context.getDefaultCallingConvention(/*IsVariadic=*/false,
                                          /*IsCXXMethod=*/true));
return EPI;
6489}

6491void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) {
const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
if (FPT->getExceptionSpecType() != EST_Unevaluated)
  return;

// Evaluate the exception specification.
auto IES = computeImplicitExceptionSpec(*this, Loc, MD);
auto ESI = IES.getExceptionSpec();

// Update the type of the special member to use it.
UpdateExceptionSpec(MD, ESI);

// A user-provided destructor can be defined outside the class. When that
// happens, be sure to update the exception specification on both
// declarations.
const FunctionProtoType *CanonicalFPT =
  MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>();
if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated)
  UpdateExceptionSpec(MD->getCanonicalDecl(), ESI);
6510}

6512void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) {
CXXRecordDecl *RD = MD->getParent();
CXXSpecialMember CSM = getSpecialMember(MD);

assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid &&((MD->isExplicitlyDefaulted() && CSM != CXXInvalid
 && "not an explicitly-defaulted special member") ? static_cast
<void> (0) : __assert_fail ("MD->isExplicitlyDefaulted() && CSM != CXXInvalid && \"not an explicitly-defaulted special member\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6517, __PRETTY_FUNCTION__))
       "not an explicitly-defaulted special member")((MD->isExplicitlyDefaulted() && CSM != CXXInvalid
 && "not an explicitly-defaulted special member") ? static_cast
<void> (0) : __assert_fail ("MD->isExplicitlyDefaulted() && CSM != CXXInvalid && \"not an explicitly-defaulted special member\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6517, __PRETTY_FUNCTION__));

// Whether this was the first-declared instance of the constructor.
// This affects whether we implicitly add an exception spec and constexpr.
bool First = MD == MD->getCanonicalDecl();

bool HadError = false;

// C++11 [dcl.fct.def.default]p1:
//   A function that is explicitly defaulted shall
//     -- be a special member function (checked elsewhere),
//     -- have the same type (except for ref-qualifiers, and except that a
//        copy operation can take a non-const reference) as an implicit
//        declaration, and
//     -- not have default arguments.
// C++2a changes the second bullet to instead delete the function if it's
// defaulted on its first declaration, unless it's "an assignment operator,
// and its return type differs or its parameter type is not a reference".
bool DeleteOnTypeMismatch = getLangOpts().CPlusPlus2a && First;
bool ShouldDeleteForTypeMismatch = false;
unsigned ExpectedParams = 1;
if (CSM == CXXDefaultConstructor || CSM == CXXDestructor)
  ExpectedParams = 0;
if (MD->getNumParams() != ExpectedParams) {
  // This checks for default arguments: a copy or move constructor with a
  // default argument is classified as a default constructor, and assignment
  // operations and destructors can't have default arguments.
  Diag(MD->getLocation(), diag::err_defaulted_special_member_params)
    << CSM << MD->getSourceRange();
  HadError = true;
} else if (MD->isVariadic()) {
  if (DeleteOnTypeMismatch)
    ShouldDeleteForTypeMismatch = true;
  else {
    Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic)
      << CSM << MD->getSourceRange();
    HadError = true;
  }
}

const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>();

bool CanHaveConstParam = false;
if (CSM == CXXCopyConstructor)
  CanHaveConstParam = RD->implicitCopyConstructorHasConstParam();
else if (CSM == CXXCopyAssignment)
  CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam();

QualType ReturnType = Context.VoidTy;
if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) {
  // Check for return type matching.
  ReturnType = Type->getReturnType();

  QualType DeclType = Context.getTypeDeclType(RD);
  DeclType = Context.getAddrSpaceQualType(DeclType, MD->getMethodQualifiers().getAddressSpace());
  QualType ExpectedReturnType = Context.getLValueReferenceType(DeclType);

  if (!Context.hasSameType(ReturnType, ExpectedReturnType)) {
    Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type)
      << (CSM == CXXMoveAssignment) << ExpectedReturnType;
    HadError = true;
  }

  // A defaulted special member cannot have cv-qualifiers.
  if (Type->getMethodQuals().hasConst() || Type->getMethodQuals().hasVolatile()) {
    if (DeleteOnTypeMismatch)
      ShouldDeleteForTypeMismatch = true;
    else {
      Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
        << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14;
      HadError = true;
    }
  }
}

// Check for parameter type matching.
QualType ArgType = ExpectedParams ? Type->getParamType(0) : QualType();
bool HasConstParam = false;
if (ExpectedParams && ArgType->isReferenceType()) {
  // Argument must be reference to possibly-const T.
  QualType ReferentType = ArgType->getPointeeType();
  HasConstParam = ReferentType.isConstQualified();

  if (ReferentType.isVolatileQualified()) {
    if (DeleteOnTypeMismatch)
      ShouldDeleteForTypeMismatch = true;
    else {
      Diag(MD->getLocation(),
           diag::err_defaulted_special_member_volatile_param) << CSM;
      HadError = true;
    }
  }

  if (HasConstParam && !CanHaveConstParam) {
    if (DeleteOnTypeMismatch)
      ShouldDeleteForTypeMismatch = true;
    else if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
      Diag(MD->getLocation(),
           diag::err_defaulted_special_member_copy_const_param)
        << (CSM == CXXCopyAssignment);
      // FIXME: Explain why this special member can't be const.
      HadError = true;
    } else {
      Diag(MD->getLocation(),
           diag::err_defaulted_special_member_move_const_param)
        << (CSM == CXXMoveAssignment);
      HadError = true;
    }
  }
} else if (ExpectedParams) {
  // A copy assignment operator can take its argument by value, but a
  // defaulted one cannot.
  assert(CSM == CXXCopyAssignment && "unexpected non-ref argument")((CSM == CXXCopyAssignment && "unexpected non-ref argument"
) ? static_cast<void> (0) : __assert_fail ("CSM == CXXCopyAssignment && \"unexpected non-ref argument\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6629, __PRETTY_FUNCTION__));
  Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
  HadError = true;
}

// C++11 [dcl.fct.def.default]p2:
//   An explicitly-defaulted function may be declared constexpr only if it
//   would have been implicitly declared as constexpr,
// Do not apply this rule to members of class templates, since core issue 1358
// makes such functions always instantiate to constexpr functions. For
// functions which cannot be constexpr (for non-constructors in C++11 and for
// destructors in C++1y), this is checked elsewhere.
//
// FIXME: This should not apply if the member is deleted.
bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM,
                                                   HasConstParam);
if ((getLangOpts().CPlusPlus14 ? !isa<CXXDestructorDecl>(MD)
                               : isa<CXXConstructorDecl>(MD)) &&
    MD->isConstexpr() && !Constexpr &&
    MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
  Diag(MD->getBeginLoc(), diag::err_incorrect_defaulted_constexpr) << CSM;
  // FIXME: Explain why the special member can't be constexpr.
  HadError = true;
}

if (First) {
  // C++2a [dcl.fct.def.default]p3:
  //   If a function is explicitly defaulted on its first declaration, it is
  //   implicitly considered to be constexpr if the implicit declaration
  //   would be.
  MD->setConstexpr(Constexpr);

  if (!Type->hasExceptionSpec()) {
    // C++2a [except.spec]p3:
    //   If a declaration of a function does not have a noexcept-specifier
    //   [and] is defaulted on its first declaration, [...] the exception
    //   specification is as specified below
    FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo();
    EPI.ExceptionSpec.Type = EST_Unevaluated;
    EPI.ExceptionSpec.SourceDecl = MD;
    MD->setType(Context.getFunctionType(ReturnType,
                                        llvm::makeArrayRef(&ArgType,
                                                           ExpectedParams),
                                        EPI));
  }
}

if (ShouldDeleteForTypeMismatch || ShouldDeleteSpecialMember(MD, CSM)) {
  if (First) {
    SetDeclDeleted(MD, MD->getLocation());
    if (!inTemplateInstantiation() && !HadError) {
      Diag(MD->getLocation(), diag::warn_defaulted_method_deleted) << CSM;
      if (ShouldDeleteForTypeMismatch) {
        Diag(MD->getLocation(), diag::note_deleted_type_mismatch) << CSM;
      } else {
        ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
      }
    }
    if (ShouldDeleteForTypeMismatch && !HadError) {
      Diag(MD->getLocation(),
           diag::warn_cxx17_compat_defaulted_method_type_mismatch) << CSM;
    }
  } else {
    // C++11 [dcl.fct.def.default]p4:
    //   [For a] user-provided explicitly-defaulted function [...] if such a
    //   function is implicitly defined as deleted, the program is ill-formed.
    Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM;
    assert(!ShouldDeleteForTypeMismatch && "deleted non-first decl")((!ShouldDeleteForTypeMismatch && "deleted non-first decl"
) ? static_cast<void> (0) : __assert_fail ("!ShouldDeleteForTypeMismatch && \"deleted non-first decl\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6696, __PRETTY_FUNCTION__));
    ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
    HadError = true;
  }
}

if (HadError)
  MD->setInvalidDecl();
6704}

6706void Sema::CheckDelayedMemberExceptionSpecs() {
decltype(DelayedOverridingExceptionSpecChecks) Overriding;
decltype(DelayedEquivalentExceptionSpecChecks) Equivalent;

std::swap(Overriding, DelayedOverridingExceptionSpecChecks);
std::swap(Equivalent, DelayedEquivalentExceptionSpecChecks);

// Perform any deferred checking of exception specifications for virtual
// destructors.
for (auto &Check : Overriding)
  CheckOverridingFunctionExceptionSpec(Check.first, Check.second);

// Perform any deferred checking of exception specifications for befriended
// special members.
for (auto &Check : Equivalent)
  CheckEquivalentExceptionSpec(Check.second, Check.first);
6722}

6724namespace {
6725/// CRTP base class for visiting operations performed by a special member
6726/// function (or inherited constructor).
6727template<typename Derived>
6728struct SpecialMemberVisitor {
Sema &S;
CXXMethodDecl *MD;
Sema::CXXSpecialMember CSM;
Sema::InheritedConstructorInfo *ICI;

// Properties of the special member, computed for convenience.
bool IsConstructor = false, IsAssignment = false, ConstArg = false;

SpecialMemberVisitor(Sema &S, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM,
                     Sema::InheritedConstructorInfo *ICI)
    : S(S), MD(MD), CSM(CSM), ICI(ICI) {
  switch (CSM) {
  case Sema::CXXDefaultConstructor:
  case Sema::CXXCopyConstructor:
  case Sema::CXXMoveConstructor:
    IsConstructor = true;
    break;
  case Sema::CXXCopyAssignment:
  case Sema::CXXMoveAssignment:
    IsAssignment = true;
    break;
  case Sema::CXXDestructor:
    break;
  case Sema::CXXInvalid:
    llvm_unreachable("invalid special member kind")::llvm::llvm_unreachable_internal("invalid special member kind"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6753);
  }

  if (MD->getNumParams()) {
    if (const ReferenceType *RT =
            MD->getParamDecl(0)->getType()->getAs<ReferenceType>())
      ConstArg = RT->getPointeeType().isConstQualified();
  }
}

Derived &getDerived() { return static_cast<Derived&>(*this); }

/// Is this a "move" special member?
bool isMove() const {
  return CSM == Sema::CXXMoveConstructor || CSM == Sema::CXXMoveAssignment;
}

/// Look up the corresponding special member in the given class.
Sema::SpecialMemberOverloadResult lookupIn(CXXRecordDecl *Class,
                                           unsigned Quals, bool IsMutable) {
  return lookupCallFromSpecialMember(S, Class, CSM, Quals,
                                     ConstArg && !IsMutable);
}

/// Look up the constructor for the specified base class to see if it's
/// overridden due to this being an inherited constructor.
Sema::SpecialMemberOverloadResult lookupInheritedCtor(CXXRecordDecl *Class) {
  if (!ICI)
    return {};
  assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void>
 (0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6782, __PRETTY_FUNCTION__));
  auto *BaseCtor =
    cast<CXXConstructorDecl>(MD)->getInheritedConstructor().getConstructor();
  if (auto *MD = ICI->findConstructorForBase(Class, BaseCtor).first)
    return MD;
  return {};
}

/// A base or member subobject.
typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject;

/// Get the location to use for a subobject in diagnostics.
static SourceLocation getSubobjectLoc(Subobject Subobj) {
  // FIXME: For an indirect virtual base, the direct base leading to
  // the indirect virtual base would be a more useful choice.
  if (auto *B = Subobj.dyn_cast<CXXBaseSpecifier*>())
    return B->getBaseTypeLoc();
  else
    return Subobj.get<FieldDecl*>()->getLocation();
}

enum BasesToVisit {
  /// Visit all non-virtual (direct) bases.
  VisitNonVirtualBases,
  /// Visit all direct bases, virtual or not.
  VisitDirectBases,
  /// Visit all non-virtual bases, and all virtual bases if the class
  /// is not abstract.
  VisitPotentiallyConstructedBases,
  /// Visit all direct or virtual bases.
  VisitAllBases
};

// Visit the bases and members of the class.
bool visit(BasesToVisit Bases) {
  CXXRecordDecl *RD = MD->getParent();

  if (Bases == VisitPotentiallyConstructedBases)
    Bases = RD->isAbstract() ? VisitNonVirtualBases : VisitAllBases;

  for (auto &B : RD->bases())
    if ((Bases == VisitDirectBases || !B.isVirtual()) &&
        getDerived().visitBase(&B))
      return true;

  if (Bases == VisitAllBases)
    for (auto &B : RD->vbases())
      if (getDerived().visitBase(&B))
        return true;

  for (auto *F : RD->fields())
    if (!F->isInvalidDecl() && !F->isUnnamedBitfield() &&
        getDerived().visitField(F))
      return true;

  return false;
}
6839};
6840}

6842namespace {
6843struct SpecialMemberDeletionInfo
  : SpecialMemberVisitor<SpecialMemberDeletionInfo> {
bool Diagnose;

SourceLocation Loc;

bool AllFieldsAreConst;

SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD,
                          Sema::CXXSpecialMember CSM,
                          Sema::InheritedConstructorInfo *ICI, bool Diagnose)
    : SpecialMemberVisitor(S, MD, CSM, ICI), Diagnose(Diagnose),
      Loc(MD->getLocation()), AllFieldsAreConst(true) {}

bool inUnion() const { return MD->getParent()->isUnion(); }

Sema::CXXSpecialMember getEffectiveCSM() {
  return ICI ? Sema::CXXInvalid : CSM;
}

bool shouldDeleteForVariantObjCPtrMember(FieldDecl *FD, QualType FieldType);

bool visitBase(CXXBaseSpecifier *Base) { return shouldDeleteForBase(Base); }
bool visitField(FieldDecl *Field) { return shouldDeleteForField(Field); }

bool shouldDeleteForBase(CXXBaseSpecifier *Base);
bool shouldDeleteForField(FieldDecl *FD);
bool shouldDeleteForAllConstMembers();

bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
                                   unsigned Quals);
bool shouldDeleteForSubobjectCall(Subobject Subobj,
                                  Sema::SpecialMemberOverloadResult SMOR,
                                  bool IsDtorCallInCtor);

bool isAccessible(Subobject Subobj, CXXMethodDecl *D);
6879};
6880}

6882/// Is the given special member inaccessible when used on the given
6883/// sub-object.
6884bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj,
                                           CXXMethodDecl *target) {
/// If we're operating on a base class, the object type is the
/// type of this special member.
QualType objectTy;
AccessSpecifier access = target->getAccess();
if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) {
  objectTy = S.Context.getTypeDeclType(MD->getParent());
  access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access);

// If we're operating on a field, the object type is the type of the field.
} else {
  objectTy = S.Context.getTypeDeclType(target->getParent());
}

return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy);
6900}

6902/// Check whether we should delete a special member due to the implicit
6903/// definition containing a call to a special member of a subobject.
6904bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
  Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR,
  bool IsDtorCallInCtor) {
CXXMethodDecl *Decl = SMOR.getMethod();
FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();

int DiagKind = -1;

if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
  DiagKind = !Decl ? 0 : 1;
else if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
  DiagKind = 2;
else if (!isAccessible(Subobj, Decl))
  DiagKind = 3;
else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() &&
         !Decl->isTrivial()) {
  // A member of a union must have a trivial corresponding special member.
  // As a weird special case, a destructor call from a union's constructor
  // must be accessible and non-deleted, but need not be trivial. Such a
  // destructor is never actually called, but is semantically checked as
  // if it were.
  DiagKind = 4;
}

if (DiagKind == -1)
  return false;

if (Diagnose) {
  if (Field) {
    S.Diag(Field->getLocation(),
           diag::note_deleted_special_member_class_subobject)
      << getEffectiveCSM() << MD->getParent() << /*IsField*/true
      << Field << DiagKind << IsDtorCallInCtor << /*IsObjCPtr*/false;
  } else {
    CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>();
    S.Diag(Base->getBeginLoc(),
           diag::note_deleted_special_member_class_subobject)
        << getEffectiveCSM() << MD->getParent() << /*IsField*/ false
        << Base->getType() << DiagKind << IsDtorCallInCtor
        << /*IsObjCPtr*/false;
  }

  if (DiagKind == 1)
    S.NoteDeletedFunction(Decl);
  // FIXME: Explain inaccessibility if DiagKind == 3.
}

return true;
6952}

6954/// Check whether we should delete a special member function due to having a
6955/// direct or virtual base class or non-static data member of class type M.
6956bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject(
  CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) {
FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
bool IsMutable = Field && Field->isMutable();

// C++11 [class.ctor]p5:
// -- any direct or virtual base class, or non-static data member with no
//    brace-or-equal-initializer, has class type M (or array thereof) and
//    either M has no default constructor or overload resolution as applied
//    to M's default constructor results in an ambiguity or in a function
//    that is deleted or inaccessible
// C++11 [class.copy]p11, C++11 [class.copy]p23:
// -- a direct or virtual base class B that cannot be copied/moved because
//    overload resolution, as applied to B's corresponding special member,
//    results in an ambiguity or a function that is deleted or inaccessible
//    from the defaulted special member
// C++11 [class.dtor]p5:
// -- any direct or virtual base class [...] has a type with a destructor
//    that is deleted or inaccessible
if (!(CSM == Sema::CXXDefaultConstructor &&
      Field && Field->hasInClassInitializer()) &&
    shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable),
                                 false))
  return true;

// C++11 [class.ctor]p5, C++11 [class.copy]p11:
// -- any direct or virtual base class or non-static data member has a
//    type with a destructor that is deleted or inaccessible
if (IsConstructor) {
  Sema::SpecialMemberOverloadResult SMOR =
      S.LookupSpecialMember(Class, Sema::CXXDestructor,
                            false, false, false, false, false);
  if (shouldDeleteForSubobjectCall(Subobj, SMOR, true))
    return true;
}

return false;
6993}

6995bool SpecialMemberDeletionInfo::shouldDeleteForVariantObjCPtrMember(
  FieldDecl *FD, QualType FieldType) {
// The defaulted special functions are defined as deleted if this is a variant
// member with a non-trivial ownership type, e.g., ObjC __strong or __weak
// type under ARC.
if (!FieldType.hasNonTrivialObjCLifetime())
  return false;

// Don't make the defaulted default constructor defined as deleted if the
// member has an in-class initializer.
if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())
  return false;

if (Diagnose) {
  auto *ParentClass = cast<CXXRecordDecl>(FD->getParent());
  S.Diag(FD->getLocation(),
         diag::note_deleted_special_member_class_subobject)
      << getEffectiveCSM() << ParentClass << /*IsField*/true
      << FD << 4 << /*IsDtorCallInCtor*/false << /*IsObjCPtr*/true;
}

return true;
7017}

7019/// Check whether we should delete a special member function due to the class
7020/// having a particular direct or virtual base class.
7021bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) {
CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl();
// If program is correct, BaseClass cannot be null, but if it is, the error
// must be reported elsewhere.
if (!BaseClass)
  return false;
// If we have an inheriting constructor, check whether we're calling an
// inherited constructor instead of a default constructor.
Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass);
if (auto *BaseCtor = SMOR.getMethod()) {
  // Note that we do not check access along this path; other than that,
  // this is the same as shouldDeleteForSubobjectCall(Base, BaseCtor, false);
  // FIXME: Check that the base has a usable destructor! Sink this into
  // shouldDeleteForClassSubobject.
  if (BaseCtor->isDeleted() && Diagnose) {
    S.Diag(Base->getBeginLoc(),
           diag::note_deleted_special_member_class_subobject)
        << getEffectiveCSM() << MD->getParent() << /*IsField*/ false
        << Base->getType() << /*Deleted*/ 1 << /*IsDtorCallInCtor*/ false
        << /*IsObjCPtr*/false;
    S.NoteDeletedFunction(BaseCtor);
  }
  return BaseCtor->isDeleted();
}
return shouldDeleteForClassSubobject(BaseClass, Base, 0);
7046}

7048/// Check whether we should delete a special member function due to the class
7049/// having a particular non-static data member.
7050bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) {
QualType FieldType = S.Context.getBaseElementType(FD->getType());
CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();

if (inUnion() && shouldDeleteForVariantObjCPtrMember(FD, FieldType))
  return true;

if (CSM == Sema::CXXDefaultConstructor) {
  // For a default constructor, all references must be initialized in-class
  // and, if a union, it must have a non-const member.
  if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) {
    if (Diagnose)
      S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
        << !!ICI << MD->getParent() << FD << FieldType << /*Reference*/0;
    return true;
  }
  // C++11 [class.ctor]p5: any non-variant non-static data member of
  // const-qualified type (or array thereof) with no
  // brace-or-equal-initializer does not have a user-provided default
  // constructor.
  if (!inUnion() && FieldType.isConstQualified() &&
      !FD->hasInClassInitializer() &&
      (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) {
    if (Diagnose)
      S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
        << !!ICI << MD->getParent() << FD << FD->getType() << /*Const*/1;
    return true;
  }

  if (inUnion() && !FieldType.isConstQualified())
    AllFieldsAreConst = false;
} else if (CSM == Sema::CXXCopyConstructor) {
  // For a copy constructor, data members must not be of rvalue reference
  // type.
  if (FieldType->isRValueReferenceType()) {
    if (Diagnose)
      S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference)
        << MD->getParent() << FD << FieldType;
    return true;
  }
} else if (IsAssignment) {
  // For an assignment operator, data members must not be of reference type.
  if (FieldType->isReferenceType()) {
    if (Diagnose)
      S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
        << isMove() << MD->getParent() << FD << FieldType << /*Reference*/0;
    return true;
  }
  if (!FieldRecord && FieldType.isConstQualified()) {
    // C++11 [class.copy]p23:
    // -- a non-static data member of const non-class type (or array thereof)
    if (Diagnose)
      S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
        << isMove() << MD->getParent() << FD << FD->getType() << /*Const*/1;
    return true;
  }
}

if (FieldRecord) {
  // Some additional restrictions exist on the variant members.
  if (!inUnion() && FieldRecord->isUnion() &&
      FieldRecord->isAnonymousStructOrUnion()) {
    bool AllVariantFieldsAreConst = true;

    // FIXME: Handle anonymous unions declared within anonymous unions.
    for (auto *UI : FieldRecord->fields()) {
      QualType UnionFieldType = S.Context.getBaseElementType(UI->getType());

      if (shouldDeleteForVariantObjCPtrMember(&*UI, UnionFieldType))
        return true;

      if (!UnionFieldType.isConstQualified())
        AllVariantFieldsAreConst = false;

      CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl();
      if (UnionFieldRecord &&
          shouldDeleteForClassSubobject(UnionFieldRecord, UI,
                                        UnionFieldType.getCVRQualifiers()))
        return true;
    }

    // At least one member in each anonymous union must be non-const
    if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst &&
        !FieldRecord->field_empty()) {
      if (Diagnose)
        S.Diag(FieldRecord->getLocation(),
               diag::note_deleted_default_ctor_all_const)
          << !!ICI << MD->getParent() << /*anonymous union*/1;
      return true;
    }

    // Don't check the implicit member of the anonymous union type.
    // This is technically non-conformant, but sanity demands it.
    return false;
  }

  if (shouldDeleteForClassSubobject(FieldRecord, FD,
                                    FieldType.getCVRQualifiers()))
    return true;
}

return false;
7152}

7154/// C++11 [class.ctor] p5:
7155///   A defaulted default constructor for a class X is defined as deleted if
7156/// X is a union and all of its variant members are of const-qualified type.
7157bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() {
// This is a silly definition, because it gives an empty union a deleted
// default constructor. Don't do that.
if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst) {
  bool AnyFields = false;
  for (auto *F : MD->getParent()->fields())
    if ((AnyFields = !F->isUnnamedBitfield()))
      break;
  if (!AnyFields)
    return false;
  if (Diagnose)
    S.Diag(MD->getParent()->getLocation(),
           diag::note_deleted_default_ctor_all_const)
      << !!ICI << MD->getParent() << /*not anonymous union*/0;
  return true;
}
return false;
7174}

7176/// Determine whether a defaulted special member function should be defined as
7177/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11,
7178/// C++11 [class.copy]p23, and C++11 [class.dtor]p5.
7179bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
                                   InheritedConstructorInfo *ICI,
                                   bool Diagnose) {
if (MD->isInvalidDecl())
  return false;
CXXRecordDecl *RD = MD->getParent();
assert(!RD->isDependentType() && "do deletion after instantiation")((!RD->isDependentType() && "do deletion after instantiation"
) ? static_cast<void> (0) : __assert_fail ("!RD->isDependentType() && \"do deletion after instantiation\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7185, __PRETTY_FUNCTION__));
if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl())
  return false;

// C++11 [expr.lambda.prim]p19:
//   The closure type associated with a lambda-expression has a
//   deleted (8.4.3) default constructor and a deleted copy
//   assignment operator.
// C++2a adds back these operators if the lambda has no capture-default.
if (RD->isLambda() && !RD->lambdaIsDefaultConstructibleAndAssignable() &&
    (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) {
  if (Diagnose)
    Diag(RD->getLocation(), diag::note_lambda_decl);
  return true;
}

// For an anonymous struct or union, the copy and assignment special members
// will never be used, so skip the check. For an anonymous union declared at
// namespace scope, the constructor and destructor are used.
if (CSM != CXXDefaultConstructor && CSM != CXXDestructor &&
    RD->isAnonymousStructOrUnion())
  return false;

// C++11 [class.copy]p7, p18:
//   If the class definition declares a move constructor or move assignment
//   operator, an implicitly declared copy constructor or copy assignment
//   operator is defined as deleted.
if (MD->isImplicit() &&
    (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) {
  CXXMethodDecl *UserDeclaredMove = nullptr;

  // In Microsoft mode up to MSVC 2013, a user-declared move only causes the
  // deletion of the corresponding copy operation, not both copy operations.
  // MSVC 2015 has adopted the standards conforming behavior.
  bool DeletesOnlyMatchingCopy =
      getLangOpts().MSVCCompat &&
      !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015);

  if (RD->hasUserDeclaredMoveConstructor() &&
      (!DeletesOnlyMatchingCopy || CSM == CXXCopyConstructor)) {
    if (!Diagnose) return true;

    // Find any user-declared move constructor.
    for (auto *I : RD->ctors()) {
      if (I->isMoveConstructor()) {
        UserDeclaredMove = I;
        break;
      }
    }
    assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail
 ("UserDeclaredMove", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7234, __PRETTY_FUNCTION__));
  } else if (RD->hasUserDeclaredMoveAssignment() &&
             (!DeletesOnlyMatchingCopy || CSM == CXXCopyAssignment)) {
    if (!Diagnose) return true;

    // Find any user-declared move assignment operator.
    for (auto *I : RD->methods()) {
      if (I->isMoveAssignmentOperator()) {
        UserDeclaredMove = I;
        break;
      }
    }
    assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail
 ("UserDeclaredMove", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7246, __PRETTY_FUNCTION__));
  }

  if (UserDeclaredMove) {
    Diag(UserDeclaredMove->getLocation(),
         diag::note_deleted_copy_user_declared_move)
      << (CSM == CXXCopyAssignment) << RD
      << UserDeclaredMove->isMoveAssignmentOperator();
    return true;
  }
}

// Do access control from the special member function
ContextRAII MethodContext(*this, MD);

// C++11 [class.dtor]p5:
// -- for a virtual destructor, lookup of the non-array deallocation function
//    results in an ambiguity or in a function that is deleted or inaccessible
if (CSM == CXXDestructor && MD->isVirtual()) {
  FunctionDecl *OperatorDelete = nullptr;
  DeclarationName Name =
    Context.DeclarationNames.getCXXOperatorName(OO_Delete);
  if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name,
                               OperatorDelete, /*Diagnose*/false)) {
    if (Diagnose)
      Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete);
    return true;
  }
}

SpecialMemberDeletionInfo SMI(*this, MD, CSM, ICI, Diagnose);

// Per DR1611, do not consider virtual bases of constructors of abstract
// classes, since we are not going to construct them.
// Per DR1658, do not consider virtual bases of destructors of abstract
// classes either.
// Per DR2180, for assignment operators we only assign (and thus only
// consider) direct bases.
if (SMI.visit(SMI.IsAssignment ? SMI.VisitDirectBases
                               : SMI.VisitPotentiallyConstructedBases))
  return true;

if (SMI.shouldDeleteForAllConstMembers())
  return true;

if (getLangOpts().CUDA) {
  // We should delete the special member in CUDA mode if target inference
  // failed.
  // For inherited constructors (non-null ICI), CSM may be passed so that MD
  // is treated as certain special member, which may not reflect what special
  // member MD really is. However inferCUDATargetForImplicitSpecialMember
  // expects CSM to match MD, therefore recalculate CSM.
  assert(ICI || CSM == getSpecialMember(MD))((ICI || CSM == getSpecialMember(MD)) ? static_cast<void>
 (0) : __assert_fail ("ICI || CSM == getSpecialMember(MD)", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7298, __PRETTY_FUNCTION__));
  auto RealCSM = CSM;
  if (ICI)
    RealCSM = getSpecialMember(MD);

  return inferCUDATargetForImplicitSpecialMember(RD, RealCSM, MD,
                                                 SMI.ConstArg, Diagnose);
}

return false;
7308}

7310/// Perform lookup for a special member of the specified kind, and determine
7311/// whether it is trivial. If the triviality can be determined without the
7312/// lookup, skip it. This is intended for use when determining whether a
7313/// special member of a containing object is trivial, and thus does not ever
7314/// perform overload resolution for default constructors.
7315///
7316/// If \p Selected is not \c NULL, \c *Selected will be filled in with the
7317/// member that was most likely to be intended to be trivial, if any.
7318///
7319/// If \p ForCall is true, look at CXXRecord::HasTrivialSpecialMembersForCall to
7320/// determine whether the special member is trivial.
7321static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD,
                                   Sema::CXXSpecialMember CSM, unsigned Quals,
                                   bool ConstRHS,
                                   Sema::TrivialABIHandling TAH,
                                   CXXMethodDecl **Selected) {
if (Selected)
  *Selected = nullptr;

switch (CSM) {
case Sema::CXXInvalid:
  llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7331);

case Sema::CXXDefaultConstructor:
  // C++11 [class.ctor]p5:
  //   A default constructor is trivial if:
  //    - all the [direct subobjects] have trivial default constructors
  //
  // Note, no overload resolution is performed in this case.
  if (RD->hasTrivialDefaultConstructor())
    return true;

  if (Selected) {
    // If there's a default constructor which could have been trivial, dig it
    // out. Otherwise, if there's any user-provided default constructor, point
    // to that as an example of why there's not a trivial one.
    CXXConstructorDecl *DefCtor = nullptr;
    if (RD->needsImplicitDefaultConstructor())
      S.DeclareImplicitDefaultConstructor(RD);
    for (auto *CI : RD->ctors()) {
      if (!CI->isDefaultConstructor())
        continue;
      DefCtor = CI;
      if (!DefCtor->isUserProvided())
        break;
    }

    *Selected = DefCtor;
  }

  return false;

case Sema::CXXDestructor:
  // C++11 [class.dtor]p5:
  //   A destructor is trivial if:
  //    - all the direct [subobjects] have trivial destructors
  if (RD->hasTrivialDestructor() ||
      (TAH == Sema::TAH_ConsiderTrivialABI &&
       RD->hasTrivialDestructorForCall()))
    return true;

  if (Selected) {
    if (RD->needsImplicitDestructor())
      S.DeclareImplicitDestructor(RD);
    *Selected = RD->getDestructor();
  }

  return false;

case Sema::CXXCopyConstructor:
  // C++11 [class.copy]p12:
  //   A copy constructor is trivial if:
  //    - the constructor selected to copy each direct [subobject] is trivial
  if (RD->hasTrivialCopyConstructor() ||
      (TAH == Sema::TAH_ConsiderTrivialABI &&
       RD->hasTrivialCopyConstructorForCall())) {
    if (Quals == Qualifiers::Const)
      // We must either select the trivial copy constructor or reach an
      // ambiguity; no need to actually perform overload resolution.
      return true;
  } else if (!Selected) {
    return false;
  }
  // In C++98, we are not supposed to perform overload resolution here, but we
  // treat that as a language defect, as suggested on cxx-abi-dev, to treat
  // cases like B as having a non-trivial copy constructor:
  //   struct A { template<typename T> A(T&); };
  //   struct B { mutable A a; };
  goto NeedOverloadResolution;

case Sema::CXXCopyAssignment:
  // C++11 [class.copy]p25:
  //   A copy assignment operator is trivial if:
  //    - the assignment operator selected to copy each direct [subobject] is
  //      trivial
  if (RD->hasTrivialCopyAssignment()) {
    if (Quals == Qualifiers::Const)
      return true;
  } else if (!Selected) {
    return false;
  }
  // In C++98, we are not supposed to perform overload resolution here, but we
  // treat that as a language defect.
  goto NeedOverloadResolution;

case Sema::CXXMoveConstructor:
case Sema::CXXMoveAssignment:
NeedOverloadResolution:
  Sema::SpecialMemberOverloadResult SMOR =
      lookupCallFromSpecialMember(S, RD, CSM, Quals, ConstRHS);

  // The standard doesn't describe how to behave if the lookup is ambiguous.
  // We treat it as not making the member non-trivial, just like the standard
  // mandates for the default constructor. This should rarely matter, because
  // the member will also be deleted.
  if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
    return true;

  if (!SMOR.getMethod()) {
    assert(SMOR.getKind() ==((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted
) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7430, __PRETTY_FUNCTION__))
           Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted
) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7430, __PRETTY_FUNCTION__));
    return false;
  }

  // We deliberately don't check if we found a deleted special member. We're
  // not supposed to!
  if (Selected)
    *Selected = SMOR.getMethod();

  if (TAH == Sema::TAH_ConsiderTrivialABI &&
      (CSM == Sema::CXXCopyConstructor || CSM == Sema::CXXMoveConstructor))
    return SMOR.getMethod()->isTrivialForCall();
  return SMOR.getMethod()->isTrivial();
}

llvm_unreachable("unknown special method kind")::llvm::llvm_unreachable_internal("unknown special method kind"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7445);
7446}

7448static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) {
for (auto *CI : RD->ctors())
  if (!CI->isImplicit())
    return CI;

// Look for constructor templates.
typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter;
for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) {
  if (CXXConstructorDecl *CD =
        dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()))
    return CD;
}

return nullptr;
7462}

7464/// The kind of subobject we are checking for triviality. The values of this
7465/// enumeration are used in diagnostics.
7466enum TrivialSubobjectKind {
/// The subobject is a base class.
TSK_BaseClass,
/// The subobject is a non-static data member.
TSK_Field,
/// The object is actually the complete object.
TSK_CompleteObject
7473};

7475/// Check whether the special member selected for a given type would be trivial.
7476static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc,
                                    QualType SubType, bool ConstRHS,
                                    Sema::CXXSpecialMember CSM,
                                    TrivialSubobjectKind Kind,
                                    Sema::TrivialABIHandling TAH, bool Diagnose) {
CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl();
if (!SubRD)
  return true;

CXXMethodDecl *Selected;
if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(),
                             ConstRHS, TAH, Diagnose ? &Selected : nullptr))
  return true;

if (Diagnose) {
  if (ConstRHS)
    SubType.addConst();

  if (!Selected && CSM == Sema::CXXDefaultConstructor) {
    S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor)
      << Kind << SubType.getUnqualifiedType();
    if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD))
      S.Diag(CD->getLocation(), diag::note_user_declared_ctor);
  } else if (!Selected)
    S.Diag(SubobjLoc, diag::note_nontrivial_no_copy)
      << Kind << SubType.getUnqualifiedType() << CSM << SubType;
  else if (Selected->isUserProvided()) {
    if (Kind == TSK_CompleteObject)
      S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided)
        << Kind << SubType.getUnqualifiedType() << CSM;
    else {
      S.Diag(SubobjLoc, diag::note_nontrivial_user_provided)
        << Kind << SubType.getUnqualifiedType() << CSM;
      S.Diag(Selected->getLocation(), diag::note_declared_at);
    }
  } else {
    if (Kind != TSK_CompleteObject)
      S.Diag(SubobjLoc, diag::note_nontrivial_subobject)
        << Kind << SubType.getUnqualifiedType() << CSM;

    // Explain why the defaulted or deleted special member isn't trivial.
    S.SpecialMemberIsTrivial(Selected, CSM, Sema::TAH_IgnoreTrivialABI,
                             Diagnose);
  }
}

return false;
7523}

7525/// Check whether the members of a class type allow a special member to be
7526/// trivial.
7527static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD,
                                   Sema::CXXSpecialMember CSM,
                                   bool ConstArg,
                                   Sema::TrivialABIHandling TAH,
                                   bool Diagnose) {
for (const auto *FI : RD->fields()) {
  if (FI->isInvalidDecl() || FI->isUnnamedBitfield())
    continue;

  QualType FieldType = S.Context.getBaseElementType(FI->getType());

  // Pretend anonymous struct or union members are members of this class.
  if (FI->isAnonymousStructOrUnion()) {
    if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(),
                                  CSM, ConstArg, TAH, Diagnose))
      return false;
    continue;
  }

  // C++11 [class.ctor]p5:
  //   A default constructor is trivial if [...]
  //    -- no non-static data member of its class has a
  //       brace-or-equal-initializer
  if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) {
    if (Diagnose)
      S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << FI;
    return false;
  }

  // Objective C ARC 4.3.5:
  //   [...] nontrivally ownership-qualified types are [...] not trivially
  //   default constructible, copy constructible, move constructible, copy
  //   assignable, move assignable, or destructible [...]
  if (FieldType.hasNonTrivialObjCLifetime()) {
    if (Diagnose)
      S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership)
        << RD << FieldType.getObjCLifetime();
    return false;
  }

  bool ConstRHS = ConstArg && !FI->isMutable();
  if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, ConstRHS,
                                 CSM, TSK_Field, TAH, Diagnose))
    return false;
}

return true;
7574}

7576/// Diagnose why the specified class does not have a trivial special member of
7577/// the given kind.
7578void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) {
QualType Ty = Context.getRecordType(RD);

bool ConstArg = (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment);
checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, ConstArg, CSM,
                          TSK_CompleteObject, TAH_IgnoreTrivialABI,
                          /*Diagnose*/true);
7585}

7587/// Determine whether a defaulted or deleted special member function is trivial,
7588/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12,
7589/// C++11 [class.copy]p25, and C++11 [class.dtor]p5.
7590bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
                                TrivialABIHandling TAH, bool Diagnose) {
assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough")((!MD->isUserProvided() && CSM != CXXInvalid &&
 "not special enough") ? static_cast<void> (0) : __assert_fail
 ("!MD->isUserProvided() && CSM != CXXInvalid && \"not special enough\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7592, __PRETTY_FUNCTION__));

CXXRecordDecl *RD = MD->getParent();

bool ConstArg = false;

// C++11 [class.copy]p12, p25: [DR1593]
//   A [special member] is trivial if [...] its parameter-type-list is
//   equivalent to the parameter-type-list of an implicit declaration [...]
switch (CSM) {
case CXXDefaultConstructor:
case CXXDestructor:
  // Trivial default constructors and destructors cannot have parameters.
  break;

case CXXCopyConstructor:
case CXXCopyAssignment: {
  // Trivial copy operations always have const, non-volatile parameter types.
  ConstArg = true;
  const ParmVarDecl *Param0 = MD->getParamDecl(0);
  const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>();
  if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) {
    if (Diagnose)
      Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
        << Param0->getSourceRange() << Param0->getType()
        << Context.getLValueReferenceType(
             Context.getRecordType(RD).withConst());
    return false;
  }
  break;
}

case CXXMoveConstructor:
case CXXMoveAssignment: {
  // Trivial move operations always have non-cv-qualified parameters.
  const ParmVarDecl *Param0 = MD->getParamDecl(0);
  const RValueReferenceType *RT =
    Param0->getType()->getAs<RValueReferenceType>();
  if (!RT || RT->getPointeeType().getCVRQualifiers()) {
    if (Diagnose)
      Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
        << Param0->getSourceRange() << Param0->getType()
        << Context.getRValueReferenceType(Context.getRecordType(RD));
    return false;
  }
  break;
}

case CXXInvalid:
  llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7641);
}

if (MD->getMinRequiredArguments() < MD->getNumParams()) {
  if (Diagnose)
    Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(),
         diag::note_nontrivial_default_arg)
      << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange();
  return false;
}
if (MD->isVariadic()) {
  if (Diagnose)
    Diag(MD->getLocation(), diag::note_nontrivial_variadic);
  return false;
}

// C++11 [class.ctor]p5, C++11 [class.dtor]p5:
//   A copy/move [constructor or assignment operator] is trivial if
//    -- the [member] selected to copy/move each direct base class subobject
//       is trivial
//
// C++11 [class.copy]p12, C++11 [class.copy]p25:
//   A [default constructor or destructor] is trivial if
//    -- all the direct base classes have trivial [default constructors or
//       destructors]
for (const auto &BI : RD->bases())
  if (!checkTrivialSubobjectCall(*this, BI.getBeginLoc(), BI.getType(),
                                 ConstArg, CSM, TSK_BaseClass, TAH, Diagnose))
    return false;

// C++11 [class.ctor]p5, C++11 [class.dtor]p5:
//   A copy/move [constructor or assignment operator] for a class X is
//   trivial if
//    -- for each non-static data member of X that is of class type (or array
//       thereof), the constructor selected to copy/move that member is
//       trivial
//
// C++11 [class.copy]p12, C++11 [class.copy]p25:
//   A [default constructor or destructor] is trivial if
//    -- for all of the non-static data members of its class that are of class
//       type (or array thereof), each such class has a trivial [default
//       constructor or destructor]
if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, TAH, Diagnose))
  return false;

// C++11 [class.dtor]p5:
//   A destructor is trivial if [...]
//    -- the destructor is not virtual
if (CSM == CXXDestructor && MD->isVirtual()) {
  if (Diagnose)
    Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD;
  return false;
}

// C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
//   A [special member] for class X is trivial if [...]
//    -- class X has no virtual functions and no virtual base classes
if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) {
  if (!Diagnose)
    return false;

  if (RD->getNumVBases()) {
    // Check for virtual bases. We already know that the corresponding
    // member in all bases is trivial, so vbases must all be direct.
    CXXBaseSpecifier &BS = *RD->vbases_begin();
    assert(BS.isVirtual())((BS.isVirtual()) ? static_cast<void> (0) : __assert_fail
 ("BS.isVirtual()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7706, __PRETTY_FUNCTION__));
    Diag(BS.getBeginLoc(), diag::note_nontrivial_has_virtual) << RD << 1;
    return false;
  }

  // Must have a virtual method.
  for (const auto *MI : RD->methods()) {
    if (MI->isVirtual()) {
      SourceLocation MLoc = MI->getBeginLoc();
      Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0;
      return false;
    }
  }

  llvm_unreachable("dynamic class with no vbases and no virtual functions")::llvm::llvm_unreachable_internal("dynamic class with no vbases and no virtual functions"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7720);
}

// Looks like it's trivial!
return true;
7725}

7727namespace {
7728struct FindHiddenVirtualMethod {
Sema *S;
CXXMethodDecl *Method;
llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
SmallVector<CXXMethodDecl *, 8> OverloadedMethods;

7734private:
/// Check whether any most overridden method from MD in Methods
static bool CheckMostOverridenMethods(
    const CXXMethodDecl *MD,
    const llvm::SmallPtrSetImpl<const CXXMethodDecl *> &Methods) {
  if (MD->size_overridden_methods() == 0)
    return Methods.count(MD->getCanonicalDecl());
  for (const CXXMethodDecl *O : MD->overridden_methods())
    if (CheckMostOverridenMethods(O, Methods))
      return true;
  return false;
}

7747public:
/// Member lookup function that determines whether a given C++
/// method overloads virtual methods in a base class without overriding any,
/// to be used with CXXRecordDecl::lookupInBases().
bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) {
  RecordDecl *BaseRecord =
      Specifier->getType()->getAs<RecordType>()->getDecl();

  DeclarationName Name = Method->getDeclName();
  assert(Name.getNameKind() == DeclarationName::Identifier)((Name.getNameKind() == DeclarationName::Identifier) ? static_cast
<void> (0) : __assert_fail ("Name.getNameKind() == DeclarationName::Identifier"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7756, __PRETTY_FUNCTION__));

  bool foundSameNameMethod = false;
  SmallVector<CXXMethodDecl *, 8> overloadedMethods;
  for (Path.Decls = BaseRecord->lookup(Name); !Path.Decls.empty();
       Path.Decls = Path.Decls.slice(1)) {
    NamedDecl *D = Path.Decls.front();
    if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
      MD = MD->getCanonicalDecl();
      foundSameNameMethod = true;
      // Interested only in hidden virtual methods.
      if (!MD->isVirtual())
        continue;
      // If the method we are checking overrides a method from its base
      // don't warn about the other overloaded methods. Clang deviates from
      // GCC by only diagnosing overloads of inherited virtual functions that
      // do not override any other virtual functions in the base. GCC's
      // -Woverloaded-virtual diagnoses any derived function hiding a virtual
      // function from a base class. These cases may be better served by a
      // warning (not specific to virtual functions) on call sites when the
      // call would select a different function from the base class, were it
      // visible.
      // See FIXME in test/SemaCXX/warn-overload-virtual.cpp for an example.
      if (!S->IsOverload(Method, MD, false))
        return true;
      // Collect the overload only if its hidden.
      if (!CheckMostOverridenMethods(MD, OverridenAndUsingBaseMethods))
        overloadedMethods.push_back(MD);
    }
  }

  if (foundSameNameMethod)
    OverloadedMethods.append(overloadedMethods.begin(),
                             overloadedMethods.end());
  return foundSameNameMethod;
}
7792};
7793} // end anonymous namespace

7795/// Add the most overriden methods from MD to Methods
7796static void AddMostOverridenMethods(const CXXMethodDecl *MD,
                      llvm::SmallPtrSetImpl<const CXXMethodDecl *>& Methods) {
if (MD->size_overridden_methods() == 0)
  Methods.insert(MD->getCanonicalDecl());
else
  for (const CXXMethodDecl *O : MD->overridden_methods())
    AddMostOverridenMethods(O, Methods);
7803}

7805/// Check if a method overloads virtual methods in a base class without
7806/// overriding any.
7807void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD,
                        SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
if (!MD->getDeclName().isIdentifier())
  return;

CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
                   /*bool RecordPaths=*/false,
                   /*bool DetectVirtual=*/false);
FindHiddenVirtualMethod FHVM;
FHVM.Method = MD;
FHVM.S = this;

// Keep the base methods that were overridden or introduced in the subclass
// by 'using' in a set. A base method not in this set is hidden.
CXXRecordDecl *DC = MD->getParent();
DeclContext::lookup_result R = DC->lookup(MD->getDeclName());
for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) {
  NamedDecl *ND = *I;
  if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I))
    ND = shad->getTargetDecl();
  if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
    AddMostOverridenMethods(MD, FHVM.OverridenAndUsingBaseMethods);
}

if (DC->lookupInBases(FHVM, Paths))
  OverloadedMethods = FHVM.OverloadedMethods;
7833}

7835void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD,
                        SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) {
  CXXMethodDecl *overloadedMD = OverloadedMethods[i];
  PartialDiagnostic PD = PDiag(
       diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
  HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType());
  Diag(overloadedMD->getLocation(), PD);
}
7844}

7846/// Diagnose methods which overload virtual methods in a base class
7847/// without overriding any.
7848void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) {
if (MD->isInvalidDecl())
  return;

if (Diags.isIgnored(diag::warn_overloaded_virtual, MD->getLocation()))
  return;

SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
FindHiddenVirtualMethods(MD, OverloadedMethods);
if (!OverloadedMethods.empty()) {
  Diag(MD->getLocation(), diag::warn_overloaded_virtual)
    << MD << (OverloadedMethods.size() > 1);

  NoteHiddenVirtualMethods(MD, OverloadedMethods);
}
7863}

7865void Sema::checkIllFormedTrivialABIStruct(CXXRecordDecl &RD) {
auto PrintDiagAndRemoveAttr = [&]() {
  // No diagnostics if this is a template instantiation.
  if (!isTemplateInstantiation(RD.getTemplateSpecializationKind()))
    Diag(RD.getAttr<TrivialABIAttr>()->getLocation(),
         diag::ext_cannot_use_trivial_abi) << &RD;
  RD.dropAttr<TrivialABIAttr>();
};

// Ill-formed if the struct has virtual functions.
if (RD.isPolymorphic()) {
  PrintDiagAndRemoveAttr();
  return;
}

for (const auto &B : RD.bases()) {
  // Ill-formed if the base class is non-trivial for the purpose of calls or a
  // virtual base.
  if ((!B.getType()->isDependentType() &&
       !B.getType()->getAsCXXRecordDecl()->canPassInRegisters()) ||
      B.isVirtual()) {
    PrintDiagAndRemoveAttr();
    return;
  }
}

for (const auto *FD : RD.fields()) {
  // Ill-formed if the field is an ObjectiveC pointer or of a type that is
  // non-trivial for the purpose of calls.
  QualType FT = FD->getType();
  if (FT.getObjCLifetime() == Qualifiers::OCL_Weak) {
    PrintDiagAndRemoveAttr();
    return;
  }

  if (const auto *RT = FT->getBaseElementTypeUnsafe()->getAs<RecordType>())
    if (!RT->isDependentType() &&
        !cast<CXXRecordDecl>(RT->getDecl())->canPassInRegisters()) {
      PrintDiagAndRemoveAttr();
      return;
    }
}
7907}

7909void Sema::ActOnFinishCXXMemberSpecification(
  Scope *S, SourceLocation RLoc, Decl *TagDecl, SourceLocation LBrac,
  SourceLocation RBrac, const ParsedAttributesView &AttrList) {
if (!TagDecl)
  return;

AdjustDeclIfTemplate(TagDecl);

for (const ParsedAttr &AL : AttrList) {
  if (AL.getKind() != ParsedAttr::AT_Visibility)
    continue;
  AL.setInvalid();
  Diag(AL.getLoc(), diag::warn_attribute_after_definition_ignored)
      << AL.getName();
}

ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
            // strict aliasing violation!
            reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
            FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);

CheckCompletedCXXClass(cast<CXXRecordDecl>(TagDecl));
7931}

7933/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
7934/// special functions, such as the default constructor, copy
7935/// constructor, or destructor, to the given C++ class (C++
7936/// [special]p1).  This routine can only be executed just before the
7937/// definition of the class is complete.
7938void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
if (ClassDecl->needsImplicitDefaultConstructor()) {
  ++getASTContext().NumImplicitDefaultConstructors;

  if (ClassDecl->hasInheritedConstructor())
    DeclareImplicitDefaultConstructor(ClassDecl);
}

if (ClassDecl->needsImplicitCopyConstructor()) {
  ++getASTContext().NumImplicitCopyConstructors;

  // If the properties or semantics of the copy constructor couldn't be
  // determined while the class was being declared, force a declaration
  // of it now.
  if (ClassDecl->needsOverloadResolutionForCopyConstructor() ||
      ClassDecl->hasInheritedConstructor())
    DeclareImplicitCopyConstructor(ClassDecl);
  // For the MS ABI we need to know whether the copy ctor is deleted. A
  // prerequisite for deleting the implicit copy ctor is that the class has a
  // move ctor or move assignment that is either user-declared or whose
  // semantics are inherited from a subobject. FIXME: We should provide a more
  // direct way for CodeGen to ask whether the constructor was deleted.
  else if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
           (ClassDecl->hasUserDeclaredMoveConstructor() ||
            ClassDecl->needsOverloadResolutionForMoveConstructor() ||
            ClassDecl->hasUserDeclaredMoveAssignment() ||
            ClassDecl->needsOverloadResolutionForMoveAssignment()))
    DeclareImplicitCopyConstructor(ClassDecl);
}

if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) {
  ++getASTContext().NumImplicitMoveConstructors;

  if (ClassDecl->needsOverloadResolutionForMoveConstructor() ||
      ClassDecl->hasInheritedConstructor())
    DeclareImplicitMoveConstructor(ClassDecl);
}

if (ClassDecl->needsImplicitCopyAssignment()) {
  ++getASTContext().NumImplicitCopyAssignmentOperators;

  // If we have a dynamic class, then the copy assignment operator may be
  // virtual, so we have to declare it immediately. This ensures that, e.g.,
  // it shows up in the right place in the vtable and that we diagnose
  // problems with the implicit exception specification.
  if (ClassDecl->isDynamicClass() ||
      ClassDecl->needsOverloadResolutionForCopyAssignment() ||
      ClassDecl->hasInheritedAssignment())
    DeclareImplicitCopyAssignment(ClassDecl);
}

if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) {
  ++getASTContext().NumImplicitMoveAssignmentOperators;

  // Likewise for the move assignment operator.
  if (ClassDecl->isDynamicClass() ||
      ClassDecl->needsOverloadResolutionForMoveAssignment() ||
      ClassDecl->hasInheritedAssignment())
    DeclareImplicitMoveAssignment(ClassDecl);
}

if (ClassDecl->needsImplicitDestructor()) {
  ++getASTContext().NumImplicitDestructors;

  // If we have a dynamic class, then the destructor may be virtual, so we
  // have to declare the destructor immediately. This ensures that, e.g., it
  // shows up in the right place in the vtable and that we diagnose problems
  // with the implicit exception specification.
  if (ClassDecl->isDynamicClass() ||
      ClassDecl->needsOverloadResolutionForDestructor())
    DeclareImplicitDestructor(ClassDecl);
}
8010}

8012unsigned Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
if (!D)
  return 0;

// The order of template parameters is not important here. All names
// get added to the same scope.
SmallVector<TemplateParameterList *, 4> ParameterLists;

if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
  D = TD->getTemplatedDecl();

if (auto *PSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
  ParameterLists.push_back(PSD->getTemplateParameters());

if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
  for (unsigned i = 0; i < DD->getNumTemplateParameterLists(); ++i)
    ParameterLists.push_back(DD->getTemplateParameterList(i));

  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
    if (FunctionTemplateDecl *FTD = FD->getDescribedFunctionTemplate())
      ParameterLists.push_back(FTD->getTemplateParameters());
  }
}

if (TagDecl *TD = dyn_cast<TagDecl>(D)) {
  for (unsigned i = 0; i < TD->getNumTemplateParameterLists(); ++i)
    ParameterLists.push_back(TD->getTemplateParameterList(i));

  if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) {
    if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate())
      ParameterLists.push_back(CTD->getTemplateParameters());
  }
}

unsigned Count = 0;
for (TemplateParameterList *Params : ParameterLists) {
  if (Params->size() > 0)
    // Ignore explicit specializations; they don't contribute to the template
    // depth.
    ++Count;
  for (NamedDecl *Param : *Params) {
    if (Param->getDeclName()) {
      S->AddDecl(Param);
      IdResolver.AddDecl(Param);
    }
  }
}

return Count;
8061}

8063void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
if (!RecordD) return;
AdjustDeclIfTemplate(RecordD);
CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
PushDeclContext(S, Record);
8068}

8070void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
if (!RecordD) return;
PopDeclContext();
8073}

8075/// This is used to implement the constant expression evaluation part of the
8076/// attribute enable_if extension. There is nothing in standard C++ which would
8077/// require reentering parameters.
8078void Sema::ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param) {
if (!Param)
  return;

S->AddDecl(Param);
if (Param->getDeclName())
  IdResolver.AddDecl(Param);
8085}

8087/// ActOnStartDelayedCXXMethodDeclaration - We have completed
8088/// parsing a top-level (non-nested) C++ class, and we are now
8089/// parsing those parts of the given Method declaration that could
8090/// not be parsed earlier (C++ [class.mem]p2), such as default
8091/// arguments. This action should enter the scope of the given
8092/// Method declaration as if we had just parsed the qualified method
8093/// name. However, it should not bring the parameters into scope;
8094/// that will be performed by ActOnDelayedCXXMethodParameter.
8095void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
8096}

8098/// ActOnDelayedCXXMethodParameter - We've already started a delayed
8099/// C++ method declaration. We're (re-)introducing the given
8100/// function parameter into scope for use in parsing later parts of
8101/// the method declaration. For example, we could see an
8102/// ActOnParamDefaultArgument event for this parameter.
8103void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
if (!ParamD)
  return;

ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);

// If this parameter has an unparsed default argument, clear it out
// to make way for the parsed default argument.
if (Param->hasUnparsedDefaultArg())
  Param->setDefaultArg(nullptr);

S->AddDecl(Param);
if (Param->getDeclName())
  IdResolver.AddDecl(Param);
8117}

8119/// ActOnFinishDelayedCXXMethodDeclaration - We have finished
8120/// processing the delayed method declaration for Method. The method
8121/// declaration is now considered finished. There may be a separate
8122/// ActOnStartOfFunctionDef action later (not necessarily
8123/// immediately!) for this method, if it was also defined inside the
8124/// class body.
8125void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
if (!MethodD)
  return;

AdjustDeclIfTemplate(MethodD);

FunctionDecl *Method = cast<FunctionDecl>(MethodD);

// Now that we have our default arguments, check the constructor
// again. It could produce additional diagnostics or affect whether
// the class has implicitly-declared destructors, among other
// things.
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
  CheckConstructor(Constructor);

// Check the default arguments, which we may have added.
if (!Method->isInvalidDecl())
  CheckCXXDefaultArguments(Method);
8143}

8145/// CheckConstructorDeclarator - Called by ActOnDeclarator to check
8146/// the well-formedness of the constructor declarator @p D with type @p
8147/// R. If there are any errors in the declarator, this routine will
8148/// emit diagnostics and set the invalid bit to true.  In any case, the type
8149/// will be updated to reflect a well-formed type for the constructor and
8150/// returned.
8151QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
                                        StorageClass &SC) {
bool isVirtual = D.getDeclSpec().isVirtualSpecified();

// C++ [class.ctor]p3:
//   A constructor shall not be virtual (10.3) or static (9.4). A
//   constructor can be invoked for a const, volatile or const
//   volatile object. A constructor shall not be declared const,
//   volatile, or const volatile (9.3.2).
if (isVirtual) {
  if (!D.isInvalidType())
    Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
      << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
      << SourceRange(D.getIdentifierLoc());
  D.setInvalidType();
}
if (SC == SC_Static) {
  if (!D.isInvalidType())
    Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
      << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
      << SourceRange(D.getIdentifierLoc());
  D.setInvalidType();
  SC = SC_None;
}

if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
  diagnoseIgnoredQualifiers(
      diag::err_constructor_return_type, TypeQuals, SourceLocation(),
      D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(),
      D.getDeclSpec().getRestrictSpecLoc(),
      D.getDeclSpec().getAtomicSpecLoc());
  D.setInvalidType();
}

DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
if (FTI.hasMethodTypeQualifiers()) {
  FTI.MethodQualifiers->forEachQualifier(
      [&](DeclSpec::TQ TypeQual, StringRef QualName, SourceLocation SL) {
        Diag(SL, diag::err_invalid_qualified_constructor)
            << QualName << SourceRange(SL);
      });
  D.setInvalidType();
}

// C++0x [class.ctor]p4:
//   A constructor shall not be declared with a ref-qualifier.
if (FTI.hasRefQualifier()) {
  Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
    << FTI.RefQualifierIsLValueRef
    << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
  D.setInvalidType();
}

// Rebuild the function type "R" without any type qualifiers (in
// case any of the errors above fired) and with "void" as the
// return type, since constructors don't have return types.
const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
if (Proto->getReturnType() == Context.VoidTy && !D.isInvalidType())
  return R;

FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
EPI.TypeQuals = Qualifiers();
EPI.RefQualifier = RQ_None;

return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI);
8216}

8218/// CheckConstructor - Checks a fully-formed constructor for
8219/// well-formedness, issuing any diagnostics required. Returns true if
8220/// the constructor declarator is invalid.
8221void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
CXXRecordDecl *ClassDecl
  = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
if (!ClassDecl)
  return Constructor->setInvalidDecl();

// C++ [class.copy]p3:
//   A declaration of a constructor for a class X is ill-formed if
//   its first parameter is of type (optionally cv-qualified) X and
//   either there are no other parameters or else all other
//   parameters have default arguments.
if (!Constructor->isInvalidDecl() &&
    ((Constructor->getNumParams() == 1) ||
     (Constructor->getNumParams() > 1 &&
      Constructor->getParamDecl(1)->hasDefaultArg())) &&
    Constructor->getTemplateSpecializationKind()
                                            != TSK_ImplicitInstantiation) {
  QualType ParamType = Constructor->getParamDecl(0)->getType();
  QualType ClassTy = Context.getTagDeclType(ClassDecl);
  if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
    SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
    const char *ConstRef
      = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
                                                      : " const &";
    Diag(ParamLoc, diag::err_constructor_byvalue_arg)
      << FixItHint::CreateInsertion(ParamLoc, ConstRef);

    // FIXME: Rather that making the constructor invalid, we should endeavor
    // to fix the type.
    Constructor->setInvalidDecl();
  }
}
8253}

8255/// CheckDestructor - Checks a fully-formed destructor definition for
8256/// well-formedness, issuing any diagnostics required.  Returns true
8257/// on error.
8258bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
CXXRecordDecl *RD = Destructor->getParent();

if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) {
  SourceLocation Loc;

  if (!Destructor->isImplicit())
    Loc = Destructor->getLocation();
  else
    Loc = RD->getLocation();

  // If we have a virtual destructor, look up the deallocation function
  if (FunctionDecl *OperatorDelete =
          FindDeallocationFunctionForDestructor(Loc, RD)) {
    Expr *ThisArg = nullptr;

    // If the notional 'delete this' expression requires a non-trivial
    // conversion from 'this' to the type of a destroying operator delete's
    // first parameter, perform that conversion now.
    if (OperatorDelete->isDestroyingOperatorDelete()) {
      QualType ParamType = OperatorDelete->getParamDecl(0)->getType();
      if (!declaresSameEntity(ParamType->getAsCXXRecordDecl(), RD)) {
        // C++ [class.dtor]p13:
        //   ... as if for the expression 'delete this' appearing in a
        //   non-virtual destructor of the destructor's class.
        ContextRAII SwitchContext(*this, Destructor);
        ExprResult This =
            ActOnCXXThis(OperatorDelete->getParamDecl(0)->getLocation());
        assert(!This.isInvalid() && "couldn't form 'this' expr in dtor?")((!This.isInvalid() && "couldn't form 'this' expr in dtor?"
) ? static_cast<void> (0) : __assert_fail ("!This.isInvalid() && \"couldn't form 'this' expr in dtor?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 8286, __PRETTY_FUNCTION__));
        This = PerformImplicitConversion(This.get(), ParamType, AA_Passing);
        if (This.isInvalid()) {
          // FIXME: Register this as a context note so that it comes out
          // in the right order.
          Diag(Loc, diag::note_implicit_delete_this_in_destructor_here);
          return true;
        }
        ThisArg = This.get();
      }
    }

    DiagnoseUseOfDecl(OperatorDelete, Loc);
    MarkFunctionReferenced(Loc, OperatorDelete);
    Destructor->setOperatorDelete(OperatorDelete, ThisArg);
  }
}

return false;
8305}

8307/// CheckDestructorDeclarator - Called by ActOnDeclarator to check
8308/// the well-formednes of the destructor declarator @p D with type @p
8309/// R. If there are any errors in the declarator, this routine will
8310/// emit diagnostics and set the declarator to invalid.  Even if this happens,
8311/// will be updated to reflect a well-formed type for the destructor and
8312/// returned.
8313QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
                                       StorageClass& SC) {
// C++ [class.dtor]p1:
//   [...] A typedef-name that names a class is a class-name
//   (7.1.3); however, a typedef-name that names a class shall not
//   be used as the identifier in the declarator for a destructor
//   declaration.
QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
  Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
    << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
else if (const TemplateSpecializationType *TST =
           DeclaratorType->getAs<TemplateSpecializationType>())
  if (TST->isTypeAlias())
    Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
      << DeclaratorType << 1;

// C++ [class.dtor]p2:
//   A destructor is used to destroy objects of its class type. A
//   destructor takes no parameters, and no return type can be
//   specified for it (not even void). The address of a destructor
//   shall not be taken. A destructor shall not be static. A
//   destructor can be invoked for a const, volatile or const
//   volatile object. A destructor shall not be declared const,
//   volatile or const volatile (9.3.2).
if (SC == SC_Static) {
  if (!D.isInvalidType())
    Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
      << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
      << SourceRange(D.getIdentifierLoc())
      << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());

  SC = SC_None;
}
if (!D.isInvalidType()) {
  // Destructors don't have return types, but the parser will
  // happily parse something like:
  //
  //   class X {
  //     float ~X();
  //   };
  //
  // The return type will be eliminated later.
  if (D.getDeclSpec().hasTypeSpecifier())
    Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
      << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
      << SourceRange(D.getIdentifierLoc());
  else if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
    diagnoseIgnoredQualifiers(diag::err_destructor_return_type, TypeQuals,
                              SourceLocation(),
                              D.getDeclSpec().getConstSpecLoc(),
                              D.getDeclSpec().getVolatileSpecLoc(),
                              D.getDeclSpec().getRestrictSpecLoc(),
                              D.getDeclSpec().getAtomicSpecLoc());
    D.setInvalidType();
  }
}

DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
if (FTI.hasMethodTypeQualifiers() && !D.isInvalidType()) {
  FTI.MethodQualifiers->forEachQualifier(
      [&](DeclSpec::TQ TypeQual, StringRef QualName, SourceLocation SL) {
        Diag(SL, diag::err_invalid_qualified_destructor)
            << QualName << SourceRange(SL);
      });
  D.setInvalidType();
}

// C++0x [class.dtor]p2:
//   A destructor shall not be declared with a ref-qualifier.
if (FTI.hasRefQualifier()) {
  Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
    << FTI.RefQualifierIsLValueRef
    << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
  D.setInvalidType();
}

// Make sure we don't have any parameters.
if (FTIHasNonVoidParameters(FTI)) {
  Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);

  // Delete the parameters.
  FTI.freeParams();
  D.setInvalidType();
}

// Make sure the destructor isn't variadic.
if (FTI.isVariadic) {
  Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
  D.setInvalidType();
}

// Rebuild the function type "R" without any type qualifiers or
// parameters (in case any of the errors above fired) and with
// "void" as the return type, since destructors don't have return
// types.
if (!D.isInvalidType())
  return R;

const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
EPI.Variadic = false;
EPI.TypeQuals = Qualifiers();
EPI.RefQualifier = RQ_None;
return Context.getFunctionType(Context.VoidTy, None, EPI);
8418}

8420static void extendLeft(SourceRange &R, SourceRange Before) {
if (Before.isInvalid())
  return;
R.setBegin(Before.getBegin());
if (R.getEnd().isInvalid())
  R.setEnd(Before.getEnd());
8426}

8428static void extendRight(SourceRange &R, SourceRange After) {
if (After.isInvalid())
  return;
if (R.getBegin().isInvalid())
  R.setBegin(After.getBegin());
R.setEnd(After.getEnd());
8434}

8436/// CheckConversionDeclarator - Called by ActOnDeclarator to check the
8437/// well-formednes of the conversion function declarator @p D with
8438/// type @p R. If there are any errors in the declarator, this routine
8439/// will emit diagnostics and return true. Otherwise, it will return
8440/// false. Either way, the type @p R will be updated to reflect a
8441/// well-formed type for the conversion operator.
8442void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
                                   StorageClass& SC) {
// C++ [class.conv.fct]p1:
//   Neither parameter types nor return type can be specified. The
//   type of a conversion function (8.3.5) is "function taking no
//   parameter returning conversion-type-id."
if (SC == SC_Static) {
  if (!D.isInvalidType())
    Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
      << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
      << D.getName().getSourceRange();
  D.setInvalidType();
  SC = SC_None;
}

TypeSourceInfo *ConvTSI = nullptr;
QualType ConvType =
    GetTypeFromParser(D.getName().ConversionFunctionId, &ConvTSI);

const DeclSpec &DS = D.getDeclSpec();
if (DS.hasTypeSpecifier() && !D.isInvalidType()) {
  // Conversion functions don't have return types, but the parser will
  // happily parse something like:
  //
  //   class X {
  //     float operator bool();
  //   };
  //
  // The return type will be changed later anyway.
  Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
    << SourceRange(DS.getTypeSpecTypeLoc())
    << SourceRange(D.getIdentifierLoc());
  D.setInvalidType();
} else if (DS.getTypeQualifiers() && !D.isInvalidType()) {
  // It's also plausible that the user writes type qualifiers in the wrong
  // place, such as:
  //   struct S { const operator int(); };
  // FIXME: we could provide a fixit to move the qualifiers onto the
  // conversion type.
  Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl)
      << SourceRange(D.getIdentifierLoc()) << 0;
  D.setInvalidType();
}

const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();

// Make sure we don't have any parameters.
if (Proto->getNumParams() > 0) {
  Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);

  // Delete the parameters.
  D.getFunctionTypeInfo().freeParams();
  D.setInvalidType();
} else if (Proto->isVariadic()) {
  Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
  D.setInvalidType();
}

// Diagnose "&operator bool()" and other such nonsense.  This
// is actually a gcc extension which we don't support.
if (Proto->getReturnType() != ConvType) {
  bool NeedsTypedef = false;
  SourceRange Before, After;

  // Walk the chunks and extract information on them for our diagnostic.
  bool PastFunctionChunk = false;
  for (auto &Chunk : D.type_objects()) {
    switch (Chunk.Kind) {
    case DeclaratorChunk::Function:
      if (!PastFunctionChunk) {
        if (Chunk.Fun.HasTrailingReturnType) {
          TypeSourceInfo *TRT = nullptr;
          GetTypeFromParser(Chunk.Fun.getTrailingReturnType(), &TRT);
          if (TRT) extendRight(After, TRT->getTypeLoc().getSourceRange());
        }
        PastFunctionChunk = true;
        break;
      }
      LLVM_FALLTHROUGH[[clang::fallthrough]];
    case DeclaratorChunk::Array:
      NeedsTypedef = true;
      extendRight(After, Chunk.getSourceRange());
      break;

    case DeclaratorChunk::Pointer:
    case DeclaratorChunk::BlockPointer:
    case DeclaratorChunk::Reference:
    case DeclaratorChunk::MemberPointer:
    case DeclaratorChunk::Pipe:
      extendLeft(Before, Chunk.getSourceRange());
      break;

    case DeclaratorChunk::Paren:
      extendLeft(Before, Chunk.Loc);
      extendRight(After, Chunk.EndLoc);
      break;
    }
  }

  SourceLocation Loc = Before.isValid() ? Before.getBegin() :
                       After.isValid()  ? After.getBegin() :
                                          D.getIdentifierLoc();
  auto &&DB = Diag(Loc, diag::err_conv_function_with_complex_decl);
  DB << Before << After;

  if (!NeedsTypedef) {
    DB << /*don't need a typedef*/0;

    // If we can provide a correct fix-it hint, do so.
    if (After.isInvalid() && ConvTSI) {
      SourceLocation InsertLoc =
          getLocForEndOfToken(ConvTSI->getTypeLoc().getEndLoc());
      DB << FixItHint::CreateInsertion(InsertLoc, " ")
         << FixItHint::CreateInsertionFromRange(
                InsertLoc, CharSourceRange::getTokenRange(Before))
         << FixItHint::CreateRemoval(Before);
    }
  } else if (!Proto->getReturnType()->isDependentType()) {
    DB << /*typedef*/1 << Proto->getReturnType();
  } else if (getLangOpts().CPlusPlus11) {
    DB << /*alias template*/2 << Proto->getReturnType();
  } else {
    DB << /*might not be fixable*/3;
  }

  // Recover by incorporating the other type chunks into the result type.
  // Note, this does *not* change the name of the function. This is compatible
  // with the GCC extension:
  //   struct S { &operator int(); } s;
  //   int &r = s.operator int(); // ok in GCC
  //   S::operator int&() {} // error in GCC, function name is 'operator int'.
  ConvType = Proto->getReturnType();
}

// C++ [class.conv.fct]p4:
//   The conversion-type-id shall not represent a function type nor
//   an array type.
if (ConvType->isArrayType()) {
  Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
  ConvType = Context.getPointerType(ConvType);
  D.setInvalidType();
} else if (ConvType->isFunctionType()) {
  Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
  ConvType = Context.getPointerType(ConvType);
  D.setInvalidType();
}

// Rebuild the function type "R" without any parameters (in case any
// of the errors above fired) and with the conversion type as the
// return type.
if (D.isInvalidType())
  R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo());

// C++0x explicit conversion operators.
if (DS.hasExplicitSpecifier() && !getLangOpts().CPlusPlus2a)
  Diag(DS.getExplicitSpecLoc(),
       getLangOpts().CPlusPlus11
           ? diag::warn_cxx98_compat_explicit_conversion_functions
           : diag::ext_explicit_conversion_functions)
      << SourceRange(DS.getExplicitSpecRange());
8602}

8604/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
8605/// the declaration of the given C++ conversion function. This routine
8606/// is responsible for recording the conversion function in the C++
8607/// class, if possible.
8608Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
assert(Conversion && "Expected to receive a conversion function declaration")((Conversion && "Expected to receive a conversion function declaration"
) ? static_cast<void> (0) : __assert_fail ("Conversion && \"Expected to receive a conversion function declaration\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 8609, __PRETTY_FUNCTION__));

CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());

// Make sure we aren't redeclaring the conversion function.
QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());

// C++ [class.conv.fct]p1:
//   [...] A conversion function is never used to convert a
//   (possibly cv-qualified) object to the (possibly cv-qualified)
//   same object type (or a reference to it), to a (possibly
//   cv-qualified) base class of that type (or a reference to it),
//   or to (possibly cv-qualified) void.
// FIXME: Suppress this warning if the conversion function ends up being a
// virtual function that overrides a virtual function in a base class.
QualType ClassType
  = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
  ConvType = ConvTypeRef->getPointeeType();
if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
    Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
  /* Suppress diagnostics for instantiations. */;
else if (ConvType->isRecordType()) {
  ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
  if (ConvType == ClassType)
    Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
      << ClassType;
  else if (IsDerivedFrom(Conversion->getLocation(), ClassType, ConvType))
    Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
      <<  ClassType << ConvType;
} else if (ConvType->isVoidType()) {
  Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
    << ClassType << ConvType;
}

if (FunctionTemplateDecl *ConversionTemplate
                              = Conversion->getDescribedFunctionTemplate())
  return ConversionTemplate;

return Conversion;
8649}

8651namespace {
8652/// Utility class to accumulate and print a diagnostic listing the invalid
8653/// specifier(s) on a declaration.
8654struct BadSpecifierDiagnoser {
BadSpecifierDiagnoser(Sema &S, SourceLocation Loc, unsigned DiagID)
    : S(S), Diagnostic(S.Diag(Loc, DiagID)) {}
~BadSpecifierDiagnoser() {
  Diagnostic << Specifiers;
}

template<typename T> void check(SourceLocation SpecLoc, T Spec) {
  return check(SpecLoc, DeclSpec::getSpecifierName(Spec));
}
void check(SourceLocation SpecLoc, DeclSpec::TST Spec) {
  return check(SpecLoc,
               DeclSpec::getSpecifierName(Spec, S.getPrintingPolicy()));
}
void check(SourceLocation SpecLoc, const char *Spec) {
  if (SpecLoc.isInvalid()) return;
  Diagnostic << SourceRange(SpecLoc, SpecLoc);
  if (!Specifiers.empty()) Specifiers += " ";
  Specifiers += Spec;
}

Sema &S;
Sema::SemaDiagnosticBuilder Diagnostic;
std::string Specifiers;
8678};
8679}

8681/// Check the validity of a declarator that we parsed for a deduction-guide.
8682/// These aren't actually declarators in the grammar, so we need to check that
8683/// the user didn't specify any pieces that are not part of the deduction-guide
8684/// grammar.
8685void Sema::CheckDeductionGuideDeclarator(Declarator &D, QualType &R,
                                       StorageClass &SC) {
TemplateName GuidedTemplate = D.getName().TemplateName.get().get();
TemplateDecl *GuidedTemplateDecl = GuidedTemplate.getAsTemplateDecl();
assert(GuidedTemplateDecl && "missing template decl for deduction guide")((GuidedTemplateDecl && "missing template decl for deduction guide"
) ? static_cast<void> (0) : __assert_fail ("GuidedTemplateDecl && \"missing template decl for deduction guide\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 8689, __PRETTY_FUNCTION__));

// C++ [temp.deduct.guide]p3:
//   A deduction-gide shall be declared in the same scope as the
//   corresponding class template.
if (!CurContext->getRedeclContext()->Equals(
        GuidedTemplateDecl->getDeclContext()->getRedeclContext())) {
  Diag(D.getIdentifierLoc(), diag::err_deduction_guide_wrong_scope)
    << GuidedTemplateDecl;
  Diag(GuidedTemplateDecl->getLocation(), diag::note_template_decl_here);
}

auto &DS = D.getMutableDeclSpec();
// We leave 'friend' and 'virtual' to be rejected in the normal way.
if (DS.hasTypeSpecifier() || DS.getTypeQualifiers() ||
    DS.getStorageClassSpecLoc().isValid() || DS.isInlineSpecified() ||
    DS.isNoreturnSpecified() || DS.isConstexprSpecified()) {
  BadSpecifierDiagnoser Diagnoser(
      *this, D.getIdentifierLoc(),
      diag::err_deduction_guide_invalid_specifier);

  Diagnoser.check(DS.getStorageClassSpecLoc(), DS.getStorageClassSpec());
  DS.ClearStorageClassSpecs();
  SC = SC_None;

  // 'explicit' is permitted.
  Diagnoser.check(DS.getInlineSpecLoc(), "inline");
  Diagnoser.check(DS.getNoreturnSpecLoc(), "_Noreturn");
  Diagnoser.check(DS.getConstexprSpecLoc(), "constexpr");
  DS.ClearConstexprSpec();

  Diagnoser.check(DS.getConstSpecLoc(), "const");
  Diagnoser.check(DS.getRestrictSpecLoc(), "__restrict");
  Diagnoser.check(DS.getVolatileSpecLoc(), "volatile");
  Diagnoser.check(DS.getAtomicSpecLoc(), "_Atomic");
  Diagnoser.check(DS.getUnalignedSpecLoc(), "__unaligned");
  DS.ClearTypeQualifiers();

  Diagnoser.check(DS.getTypeSpecComplexLoc(), DS.getTypeSpecComplex());
  Diagnoser.check(DS.getTypeSpecSignLoc(), DS.getTypeSpecSign());
  Diagnoser.check(DS.getTypeSpecWidthLoc(), DS.getTypeSpecWidth());
  Diagnoser.check(DS.getTypeSpecTypeLoc(), DS.getTypeSpecType());
  DS.ClearTypeSpecType();
}

if (D.isInvalidType())
  return;

// Check the declarator is simple enough.
bool FoundFunction = false;
for (const DeclaratorChunk &Chunk : llvm::reverse(D.type_objects())) {
  if (Chunk.Kind == DeclaratorChunk::Paren)
    continue;
  if (Chunk.Kind != DeclaratorChunk::Function || FoundFunction) {
    Diag(D.getDeclSpec().getBeginLoc(),
         diag::err_deduction_guide_with_complex_decl)
        << D.getSourceRange();
    break;
  }
  if (!Chunk.Fun.hasTrailingReturnType()) {
    Diag(D.getName().getBeginLoc(),
         diag::err_deduction_guide_no_trailing_return_type);
    break;
  }

  // Check that the return type is written as a specialization of
  // the template specified as the deduction-guide's name.
  ParsedType TrailingReturnType = Chunk.Fun.getTrailingReturnType();
  TypeSourceInfo *TSI = nullptr;
  QualType RetTy = GetTypeFromParser(TrailingReturnType, &TSI);
  assert(TSI && "deduction guide has valid type but invalid return type?")((TSI && "deduction guide has valid type but invalid return type?"
) ? static_cast<void> (0) : __assert_fail ("TSI && \"deduction guide has valid type but invalid return type?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 8759, __PRETTY_FUNCTION__));
  bool AcceptableReturnType = false;
  bool MightInstantiateToSpecialization = false;
  if (auto RetTST =
          TSI->getTypeLoc().getAs<TemplateSpecializationTypeLoc>()) {
    TemplateName SpecifiedName = RetTST.getTypePtr()->getTemplateName();
    bool TemplateMatches =
        Context.hasSameTemplateName(SpecifiedName, GuidedTemplate);
    if (SpecifiedName.getKind() == TemplateName::Template && TemplateMatches)
      AcceptableReturnType = true;
    else {
      // This could still instantiate to the right type, unless we know it
      // names the wrong class template.
      auto *TD = SpecifiedName.getAsTemplateDecl();
      MightInstantiateToSpecialization = !(TD && isa<ClassTemplateDecl>(TD) &&
                                           !TemplateMatches);
    }
  } else if (!RetTy.hasQualifiers() && RetTy->isDependentType()) {
    MightInstantiateToSpecialization = true;
  }

  if (!AcceptableReturnType) {
    Diag(TSI->getTypeLoc().getBeginLoc(),
         diag::err_deduction_guide_bad_trailing_return_type)
        << GuidedTemplate << TSI->getType()
        << MightInstantiateToSpecialization
        << TSI->getTypeLoc().getSourceRange();
  }

  // Keep going to check that we don't have any inner declarator pieces (we
  // could still have a function returning a pointer to a function).
  FoundFunction = true;
}

if (D.isFunctionDefinition())
  Diag(D.getIdentifierLoc(), diag::err_deduction_guide_defines_function);
8795}

8797//===----------------------------------------------------------------------===//
8798// Namespace Handling
8799//===----------------------------------------------------------------------===//

8801/// Diagnose a mismatch in 'inline' qualifiers when a namespace is
8802/// reopened.
8803static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc,
                                          SourceLocation Loc,
                                          IdentifierInfo *II, bool *IsInline,
                                          NamespaceDecl *PrevNS) {
assert(*IsInline != PrevNS->isInline())((*IsInline != PrevNS->isInline()) ? static_cast<void>
 (0) : __assert_fail ("*IsInline != PrevNS->isInline()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 8807, __PRETTY_FUNCTION__));

// HACK: Work around a bug in libstdc++4.6's <atomic>, where
// std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as
// inline namespaces, with the intention of bringing names into namespace std.
//
// We support this just well enough to get that case working; this is not
// sufficient to support reopening namespaces as inline in general.
if (*IsInline && II && II->getName().startswith("__atomic") &&
    S.getSourceManager().isInSystemHeader(Loc)) {
  // Mark all prior declarations of the namespace as inline.
  for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS;
       NS = NS->getPreviousDecl())
    NS->setInline(*IsInline);
  // Patch up the lookup table for the containing namespace. This isn't really
  // correct, but it's good enough for this particular case.
  for (auto *I : PrevNS->decls())
    if (auto *ND = dyn_cast<NamedDecl>(I))
      PrevNS->getParent()->makeDeclVisibleInContext(ND);
  return;
}

if (PrevNS->isInline())
  // The user probably just forgot the 'inline', so suggest that it
  // be added back.
  S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline)
    << FixItHint::CreateInsertion(KeywordLoc, "inline ");
else
  S.Diag(Loc, diag::err_inline_namespace_mismatch);

S.Diag(PrevNS->getLocation(), diag::note_previous_definition);
*IsInline = PrevNS->isInline();
8839}

8841/// ActOnStartNamespaceDef - This is called at the start of a namespace
8842/// definition.
8843Decl *Sema::ActOnStartNamespaceDef(
  Scope *NamespcScope, SourceLocation InlineLoc, SourceLocation NamespaceLoc,
  SourceLocation IdentLoc, IdentifierInfo *II, SourceLocation LBrace,
  const ParsedAttributesView &AttrList, UsingDirectiveDecl *&UD) {
SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
// For anonymous namespace, take the location of the left brace.
SourceLocation Loc = II ? IdentLoc : LBrace;
bool IsInline = InlineLoc.isValid();
bool IsInvalid = false;
bool IsStd = false;
bool AddToKnown = false;
Scope *DeclRegionScope = NamespcScope->getParent();

NamespaceDecl *PrevNS = nullptr;
if (II) {
  // C++ [namespace.def]p2:
  //   The identifier in an original-namespace-definition shall not
  //   have been previously defined in the declarative region in
  //   which the original-namespace-definition appears. The
  //   identifier in an original-namespace-definition is the name of
  //   the namespace. Subsequently in that declarative region, it is
  //   treated as an original-namespace-name.
  //
  // Since namespace names are unique in their scope, and we don't
  // look through using directives, just look for any ordinary names
  // as if by qualified name lookup.
  LookupResult R(*this, II, IdentLoc, LookupOrdinaryName,
                 ForExternalRedeclaration);
  LookupQualifiedName(R, CurContext->getRedeclContext());
  NamedDecl *PrevDecl =
      R.isSingleResult() ? R.getRepresentativeDecl() : nullptr;
  PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl);

  if (PrevNS) {
    // This is an extended namespace definition.
    if (IsInline != PrevNS->isInline())
      DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II,
                                      &IsInline, PrevNS);
  } else if (PrevDecl) {
    // This is an invalid name redefinition.
    Diag(Loc, diag::err_redefinition_different_kind)
      << II;
    Diag(PrevDecl->getLocation(), diag::note_previous_definition);
    IsInvalid = true;
    // Continue on to push Namespc as current DeclContext and return it.
  } else if (II->isStr("std") &&
             CurContext->getRedeclContext()->isTranslationUnit()) {
    // This is the first "real" definition of the namespace "std", so update
    // our cache of the "std" namespace to point at this definition.
    PrevNS = getStdNamespace();
    IsStd = true;
    AddToKnown = !IsInline;
  } else {
    // We've seen this namespace for the first time.
    AddToKnown = !IsInline;
  }
} else {
  // Anonymous namespaces.

  // Determine whether the parent already has an anonymous namespace.
  DeclContext *Parent = CurContext->getRedeclContext();
  if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
    PrevNS = TU->getAnonymousNamespace();
  } else {
    NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
    PrevNS = ND->getAnonymousNamespace();
  }

  if (PrevNS && IsInline != PrevNS->isInline())
    DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II,
                                    &IsInline, PrevNS);
}

NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline,
                                               StartLoc, Loc, II, PrevNS);
if (IsInvalid)
  Namespc->setInvalidDecl();

ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList);
AddPragmaAttributes(DeclRegionScope, Namespc);

// FIXME: Should we be merging attributes?
if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>())
  PushNamespaceVisibilityAttr(Attr, Loc);

if (IsStd)
  StdNamespace = Namespc;
if (AddToKnown)
  KnownNamespaces[Namespc] = false;

if (II) {
  PushOnScopeChains(Namespc, DeclRegionScope);
} else {
  // Link the anonymous namespace into its parent.
  DeclContext *Parent = CurContext->getRedeclContext();
  if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
    TU->setAnonymousNamespace(Namespc);
  } else {
    cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc);
  }

  CurContext->addDecl(Namespc);

  // C++ [namespace.unnamed]p1.  An unnamed-namespace-definition
  //   behaves as if it were replaced by
  //     namespace unique { /* empty body */ }
  //     using namespace unique;
  //     namespace unique { namespace-body }
  //   where all occurrences of 'unique' in a translation unit are
  //   replaced by the same identifier and this identifier differs
  //   from all other identifiers in the entire program.

  // We just create the namespace with an empty name and then add an
  // implicit using declaration, just like the standard suggests.
  //
  // CodeGen enforces the "universally unique" aspect by giving all
  // declarations semantically contained within an anonymous
  // namespace internal linkage.

  if (!PrevNS) {
    UD = UsingDirectiveDecl::Create(Context, Parent,
                                    /* 'using' */ LBrace,
                                    /* 'namespace' */ SourceLocation(),
                                    /* qualifier */ NestedNameSpecifierLoc(),
                                    /* identifier */ SourceLocation(),
                                    Namespc,
                                    /* Ancestor */ Parent);
    UD->setImplicit();
    Parent->addDecl(UD);
  }
}

ActOnDocumentableDecl(Namespc);

// Although we could have an invalid decl (i.e. the namespace name is a
// redefinition), push it as current DeclContext and try to continue parsing.
// FIXME: We should be able to push Namespc here, so that the each DeclContext
// for the namespace has the declarations that showed up in that particular
// namespace definition.
PushDeclContext(NamespcScope, Namespc);
return Namespc;
8984}

8986/// getNamespaceDecl - Returns the namespace a decl represents. If the decl
8987/// is a namespace alias, returns the namespace it points to.
8988static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
  return AD->getNamespace();
return dyn_cast_or_null<NamespaceDecl>(D);
8992}

8994/// ActOnFinishNamespaceDef - This callback is called after a namespace is
8995/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
8996void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) {
NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
assert(Namespc && "Invalid parameter, expected NamespaceDecl")((Namespc && "Invalid parameter, expected NamespaceDecl"
) ? static_cast<void> (0) : __assert_fail ("Namespc && \"Invalid parameter, expected NamespaceDecl\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 8998, __PRETTY_FUNCTION__));
Namespc->setRBraceLoc(RBrace);
PopDeclContext();
if (Namespc->hasAttr<VisibilityAttr>())
  PopPragmaVisibility(true, RBrace);
// If this namespace contains an export-declaration, export it now.
if (DeferredExportedNamespaces.erase(Namespc))
  Dcl->setModuleOwnershipKind(Decl::ModuleOwnershipKind::VisibleWhenImported);
9006}

9008CXXRecordDecl *Sema::getStdBadAlloc() const {
return cast_or_null<CXXRecordDecl>(
                                StdBadAlloc.get(Context.getExternalSource()));
9011}

9013EnumDecl *Sema::getStdAlignValT() const {
return cast_or_null<EnumDecl>(StdAlignValT.get(Context.getExternalSource()));
9015}

9017NamespaceDecl *Sema::getStdNamespace() const {
return cast_or_null<NamespaceDecl>(
                               StdNamespace.get(Context.getExternalSource()));
9020}

9022NamespaceDecl *Sema::lookupStdExperimentalNamespace() {
if (!StdExperimentalNamespaceCache) {
  if (auto Std = getStdNamespace()) {
    LookupResult Result(*this, &PP.getIdentifierTable().get("experimental"),
                        SourceLocation(), LookupNamespaceName);
    if (!LookupQualifiedName(Result, Std) ||
        !(StdExperimentalNamespaceCache =
              Result.getAsSingle<NamespaceDecl>()))
      Result.suppressDiagnostics();
  }
}
return StdExperimentalNamespaceCache;
9034}

9036namespace {

9038enum UnsupportedSTLSelect {
USS_InvalidMember,
USS_MissingMember,
USS_NonTrivial,
USS_Other
9043};

9045struct InvalidSTLDiagnoser {
Sema &S;
SourceLocation Loc;
QualType TyForDiags;

QualType operator()(UnsupportedSTLSelect Sel = USS_Other, StringRef Name = "",
                    const VarDecl *VD = nullptr) {
  {
    auto D = S.Diag(Loc, diag::err_std_compare_type_not_supported)
             << TyForDiags << ((int)Sel);
    if (Sel == USS_InvalidMember || Sel == USS_MissingMember) {
      assert(!Name.empty())((!Name.empty()) ? static_cast<void> (0) : __assert_fail
 ("!Name.empty()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9056, __PRETTY_FUNCTION__));
      D << Name;
    }
  }
  if (Sel == USS_InvalidMember) {
    S.Diag(VD->getLocation(), diag::note_var_declared_here)
        << VD << VD->getSourceRange();
  }
  return QualType();
}
9066};
9067} // namespace

9069QualType Sema::CheckComparisonCategoryType(ComparisonCategoryType Kind,
                                         SourceLocation Loc) {
assert(getLangOpts().CPlusPlus &&((getLangOpts().CPlusPlus && "Looking for comparison category type outside of C++."
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for comparison category type outside of C++.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9072, __PRETTY_FUNCTION__))
       "Looking for comparison category type outside of C++.")((getLangOpts().CPlusPlus && "Looking for comparison category type outside of C++."
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for comparison category type outside of C++.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9072, __PRETTY_FUNCTION__));

// Check if we've already successfully checked the comparison category type
// before. If so, skip checking it again.
ComparisonCategoryInfo *Info = Context.CompCategories.lookupInfo(Kind);
if (Info && FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)])
  return Info->getType();

// If lookup failed
if (!Info) {
  std::string NameForDiags = "std::";
  NameForDiags += ComparisonCategories::getCategoryString(Kind);
  Diag(Loc, diag::err_implied_comparison_category_type_not_found)
      << NameForDiags;
  return QualType();
}

assert(Info->Kind == Kind)((Info->Kind == Kind) ? static_cast<void> (0) : __assert_fail
 ("Info->Kind == Kind", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9089, __PRETTY_FUNCTION__));
assert(Info->Record)((Info->Record) ? static_cast<void> (0) : __assert_fail
 ("Info->Record", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9090, __PRETTY_FUNCTION__));

// Update the Record decl in case we encountered a forward declaration on our
// first pass. FIXME: This is a bit of a hack.
if (Info->Record->hasDefinition())
  Info->Record = Info->Record->getDefinition();

// Use an elaborated type for diagnostics which has a name containing the
// prepended 'std' namespace but not any inline namespace names.
QualType TyForDiags = [&]() {
  auto *NNS =
      NestedNameSpecifier::Create(Context, nullptr, getStdNamespace());
  return Context.getElaboratedType(ETK_None, NNS, Info->getType());
}();

if (RequireCompleteType(Loc, TyForDiags, diag::err_incomplete_type))
  return QualType();

InvalidSTLDiagnoser UnsupportedSTLError{*this, Loc, TyForDiags};

if (!Info->Record->isTriviallyCopyable())
  return UnsupportedSTLError(USS_NonTrivial);

for (const CXXBaseSpecifier &BaseSpec : Info->Record->bases()) {
  CXXRecordDecl *Base = BaseSpec.getType()->getAsCXXRecordDecl();
  // Tolerate empty base classes.
  if (Base->isEmpty())
    continue;
  // Reject STL implementations which have at least one non-empty base.
  return UnsupportedSTLError();
}

// Check that the STL has implemented the types using a single integer field.
// This expectation allows better codegen for builtin operators. We require:
//   (1) The class has exactly one field.
//   (2) The field is an integral or enumeration type.
auto FIt = Info->Record->field_begin(), FEnd = Info->Record->field_end();
if (std::distance(FIt, FEnd) != 1 ||
    !FIt->getType()->isIntegralOrEnumerationType()) {
  return UnsupportedSTLError();
}

// Build each of the require values and store them in Info.
for (ComparisonCategoryResult CCR :
     ComparisonCategories::getPossibleResultsForType(Kind)) {
  StringRef MemName = ComparisonCategories::getResultString(CCR);
  ComparisonCategoryInfo::ValueInfo *ValInfo = Info->lookupValueInfo(CCR);

  if (!ValInfo)
    return UnsupportedSTLError(USS_MissingMember, MemName);

  VarDecl *VD = ValInfo->VD;
  assert(VD && "should not be null!")((VD && "should not be null!") ? static_cast<void>
 (0) : __assert_fail ("VD && \"should not be null!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9142, __PRETTY_FUNCTION__));

  // Attempt to diagnose reasons why the STL definition of this type
  // might be foobar, including it failing to be a constant expression.
  // TODO Handle more ways the lookup or result can be invalid.
  if (!VD->isStaticDataMember() || !VD->isConstexpr() || !VD->hasInit() ||
      !VD->checkInitIsICE())
    return UnsupportedSTLError(USS_InvalidMember, MemName, VD);

  // Attempt to evaluate the var decl as a constant expression and extract
  // the value of its first field as a ICE. If this fails, the STL
  // implementation is not supported.
  if (!ValInfo->hasValidIntValue())
    return UnsupportedSTLError();

  MarkVariableReferenced(Loc, VD);
}

// We've successfully built the required types and expressions. Update
// the cache and return the newly cached value.
FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)] = true;
return Info->getType();
9164}

9166/// Retrieve the special "std" namespace, which may require us to
9167/// implicitly define the namespace.
9168NamespaceDecl *Sema::getOrCreateStdNamespace() {
if (!StdNamespace) {
  // The "std" namespace has not yet been defined, so build one implicitly.
  StdNamespace = NamespaceDecl::Create(Context,
                                       Context.getTranslationUnitDecl(),
                                       /*Inline=*/false,
                                       SourceLocation(), SourceLocation(),
                                       &PP.getIdentifierTable().get("std"),
                                       /*PrevDecl=*/nullptr);
  getStdNamespace()->setImplicit(true);
}

return getStdNamespace();
9181}

9183bool Sema::isStdInitializerList(QualType Ty, QualType *Element) {
assert(getLangOpts().CPlusPlus &&((getLangOpts().CPlusPlus && "Looking for std::initializer_list outside of C++."
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for std::initializer_list outside of C++.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9185, __PRETTY_FUNCTION__))
       "Looking for std::initializer_list outside of C++.")((getLangOpts().CPlusPlus && "Looking for std::initializer_list outside of C++."
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for std::initializer_list outside of C++.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9185, __PRETTY_FUNCTION__));

// We're looking for implicit instantiations of
// template <typename E> class std::initializer_list.

if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it.
  return false;

ClassTemplateDecl *Template = nullptr;
const TemplateArgument *Arguments = nullptr;

if (const RecordType *RT = Ty->getAs<RecordType>()) {

  ClassTemplateSpecializationDecl *Specialization =
      dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
  if (!Specialization)
    return false;

  Template = Specialization->getSpecializedTemplate();
  Arguments = Specialization->getTemplateArgs().data();
} else if (const TemplateSpecializationType *TST =
               Ty->getAs<TemplateSpecializationType>()) {
  Template = dyn_cast_or_null<ClassTemplateDecl>(
      TST->getTemplateName().getAsTemplateDecl());
  Arguments = TST->getArgs();
}
if (!Template)
  return false;

if (!StdInitializerList) {
  // Haven't recognized std::initializer_list yet, maybe this is it.
  CXXRecordDecl *TemplateClass = Template->getTemplatedDecl();
  if (TemplateClass->getIdentifier() !=
          &PP.getIdentifierTable().get("initializer_list") ||
      !getStdNamespace()->InEnclosingNamespaceSetOf(
          TemplateClass->getDeclContext()))
    return false;
  // This is a template called std::initializer_list, but is it the right
  // template?
  TemplateParameterList *Params = Template->getTemplateParameters();
  if (Params->getMinRequiredArguments() != 1)
    return false;
  if (!isa<TemplateTypeParmDecl>(Params->getParam(0)))
    return false;

  // It's the right template.
  StdInitializerList = Template;
}

if (Template->getCanonicalDecl() != StdInitializerList->getCanonicalDecl())
  return false;

// This is an instance of std::initializer_list. Find the argument type.
if (Element)
  *Element = Arguments[0].getAsType();
return true;
9241}

9243static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){
NamespaceDecl *Std = S.getStdNamespace();
if (!Std) {
  S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
  return nullptr;
}

LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"),
                    Loc, Sema::LookupOrdinaryName);
if (!S.LookupQualifiedName(Result, Std)) {
  S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
  return nullptr;
}
ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>();
if (!Template) {
  Result.suppressDiagnostics();
  // We found something weird. Complain about the first thing we found.
  NamedDecl *Found = *Result.begin();
  S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list);
  return nullptr;
}

// We found some template called std::initializer_list. Now verify that it's
// correct.
TemplateParameterList *Params = Template->getTemplateParameters();
if (Params->getMinRequiredArguments() != 1 ||
    !isa<TemplateTypeParmDecl>(Params->getParam(0))) {
  S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list);
  return nullptr;
}

return Template;
9275}

9277QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) {
if (!StdInitializerList) {
  StdInitializerList = LookupStdInitializerList(*this, Loc);
  if (!StdInitializerList)
    return QualType();
}

TemplateArgumentListInfo Args(Loc, Loc);
Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element),
                                     Context.getTrivialTypeSourceInfo(Element,
                                                                      Loc)));
return Context.getCanonicalType(
    CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args));
9290}

9292bool Sema::isInitListConstructor(const FunctionDecl *Ctor) {
// C++ [dcl.init.list]p2:
//   A constructor is an initializer-list constructor if its first parameter
//   is of type std::initializer_list<E> or reference to possibly cv-qualified
//   std::initializer_list<E> for some type E, and either there are no other
//   parameters or else all other parameters have default arguments.
if (Ctor->getNumParams() < 1 ||
    (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg()))
  return false;

QualType ArgType = Ctor->getParamDecl(0)->getType();
if (const ReferenceType *RT = ArgType->getAs<ReferenceType>())
  ArgType = RT->getPointeeType().getUnqualifiedType();

return isStdInitializerList(ArgType, nullptr);
9307}

9309/// Determine whether a using statement is in a context where it will be
9310/// apply in all contexts.
9311static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) {
switch (CurContext->getDeclKind()) {
  case Decl::TranslationUnit:
    return true;
  case Decl::LinkageSpec:
    return IsUsingDirectiveInToplevelContext(CurContext->getParent());
  default:
    return false;
}
9320}

9322namespace {

9324// Callback to only accept typo corrections that are namespaces.
9325class NamespaceValidatorCCC final : public CorrectionCandidateCallback {
9326public:
bool ValidateCandidate(const TypoCorrection &candidate) override {
  if (NamedDecl *ND = candidate.getCorrectionDecl())
    return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
  return false;
}

std::unique_ptr<CorrectionCandidateCallback> clone() override {
  return llvm::make_unique<NamespaceValidatorCCC>(*this);
}
9336};

9338}

9340static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc,
                                     CXXScopeSpec &SS,
                                     SourceLocation IdentLoc,
                                     IdentifierInfo *Ident) {
R.clear();
NamespaceValidatorCCC CCC{};
if (TypoCorrection Corrected =
        S.CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), Sc, &SS, CCC,
                      Sema::CTK_ErrorRecovery)) {
  if (DeclContext *DC = S.computeDeclContext(SS, false)) {
    std::string CorrectedStr(Corrected.getAsString(S.getLangOpts()));
    bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
                            Ident->getName().equals(CorrectedStr);
    S.diagnoseTypo(Corrected,
                   S.PDiag(diag::err_using_directive_member_suggest)
                     << Ident << DC << DroppedSpecifier << SS.getRange(),
                   S.PDiag(diag::note_namespace_defined_here));
  } else {
    S.diagnoseTypo(Corrected,
                   S.PDiag(diag::err_using_directive_suggest) << Ident,
                   S.PDiag(diag::note_namespace_defined_here));
  }
  R.addDecl(Corrected.getFoundDecl());
  return true;
}
return false;
9366}

9368Decl *Sema::ActOnUsingDirective(Scope *S, SourceLocation UsingLoc,
                              SourceLocation NamespcLoc, CXXScopeSpec &SS,
                              SourceLocation IdentLoc,
                              IdentifierInfo *NamespcName,
                              const ParsedAttributesView &AttrList) {
assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast
<void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9373, __PRETTY_FUNCTION__));
assert(NamespcName && "Invalid NamespcName.")((NamespcName && "Invalid NamespcName.") ? static_cast
<void> (0) : __assert_fail ("NamespcName && \"Invalid NamespcName.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9374, __PRETTY_FUNCTION__));
assert(IdentLoc.isValid() && "Invalid NamespceName location.")((IdentLoc.isValid() && "Invalid NamespceName location."
) ? static_cast<void> (0) : __assert_fail ("IdentLoc.isValid() && \"Invalid NamespceName location.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9375, __PRETTY_FUNCTION__));

// This can only happen along a recovery path.
while (S->isTemplateParamScope())
  S = S->getParent();
assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.")((S->getFlags() & Scope::DeclScope && "Invalid Scope."
) ? static_cast<void> (0) : __assert_fail ("S->getFlags() & Scope::DeclScope && \"Invalid Scope.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9380, __PRETTY_FUNCTION__));

UsingDirectiveDecl *UDir = nullptr;
NestedNameSpecifier *Qualifier = nullptr;
if (SS.isSet())
  Qualifier = SS.getScopeRep();

// Lookup namespace name.
LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
LookupParsedName(R, S, &SS);
if (R.isAmbiguous())
  return nullptr;

if (R.empty()) {
  R.clear();
  // Allow "using namespace std;" or "using namespace ::std;" even if
  // "std" hasn't been defined yet, for GCC compatibility.
  if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
      NamespcName->isStr("std")) {
    Diag(IdentLoc, diag::ext_using_undefined_std);
    R.addDecl(getOrCreateStdNamespace());
    R.resolveKind();
  }
  // Otherwise, attempt typo correction.
  else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName);
}

if (!R.empty()) {
  NamedDecl *Named = R.getRepresentativeDecl();
  NamespaceDecl *NS = R.getAsSingle<NamespaceDecl>();
  assert(NS && "expected namespace decl")((NS && "expected namespace decl") ? static_cast<void
> (0) : __assert_fail ("NS && \"expected namespace decl\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9410, __PRETTY_FUNCTION__));

  // The use of a nested name specifier may trigger deprecation warnings.
  DiagnoseUseOfDecl(Named, IdentLoc);

  // C++ [namespace.udir]p1:
  //   A using-directive specifies that the names in the nominated
  //   namespace can be used in the scope in which the
  //   using-directive appears after the using-directive. During
  //   unqualified name lookup (3.4.1), the names appear as if they
  //   were declared in the nearest enclosing namespace which
  //   contains both the using-directive and the nominated
  //   namespace. [Note: in this context, "contains" means "contains
  //   directly or indirectly". ]

  // Find enclosing context containing both using-directive and
  // nominated namespace.
  DeclContext *CommonAncestor = NS;
  while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
    CommonAncestor = CommonAncestor->getParent();

  UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
                                    SS.getWithLocInContext(Context),
                                    IdentLoc, Named, CommonAncestor);

  if (IsUsingDirectiveInToplevelContext(CurContext) &&
      !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) {
    Diag(IdentLoc, diag::warn_using_directive_in_header);
  }

  PushUsingDirective(S, UDir);
} else {
  Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
}

if (UDir)
  ProcessDeclAttributeList(S, UDir, AttrList);

return UDir;
9449}

9451void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
// If the scope has an associated entity and the using directive is at
// namespace or translation unit scope, add the UsingDirectiveDecl into
// its lookup structure so qualified name lookup can find it.
DeclContext *Ctx = S->getEntity();
if (Ctx && !Ctx->isFunctionOrMethod())
  Ctx->addDecl(UDir);
else
  // Otherwise, it is at block scope. The using-directives will affect lookup
  // only to the end of the scope.
  S->PushUsingDirective(UDir);
9462}

9464Decl *Sema::ActOnUsingDeclaration(Scope *S, AccessSpecifier AS,
                                SourceLocation UsingLoc,
                                SourceLocation TypenameLoc, CXXScopeSpec &SS,
                                UnqualifiedId &Name,
                                SourceLocation EllipsisLoc,
                                const ParsedAttributesView &AttrList) {
assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.")((S->getFlags() & Scope::DeclScope && "Invalid Scope."
) ? static_cast<void> (0) : __assert_fail ("S->getFlags() & Scope::DeclScope && \"Invalid Scope.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9470, __PRETTY_FUNCTION__));

if (SS.isEmpty()) {
  Diag(Name.getBeginLoc(), diag::err_using_requires_qualname);
  return nullptr;
}

switch (Name.getKind()) {
case UnqualifiedIdKind::IK_ImplicitSelfParam:
case UnqualifiedIdKind::IK_Identifier:
case UnqualifiedIdKind::IK_OperatorFunctionId:
case UnqualifiedIdKind::IK_LiteralOperatorId:
case UnqualifiedIdKind::IK_ConversionFunctionId:
  break;

case UnqualifiedIdKind::IK_ConstructorName:
case UnqualifiedIdKind::IK_ConstructorTemplateId:
  // C++11 inheriting constructors.
  Diag(Name.getBeginLoc(),
       getLangOpts().CPlusPlus11
           ? diag::warn_cxx98_compat_using_decl_constructor
           : diag::err_using_decl_constructor)
      << SS.getRange();

  if (getLangOpts().CPlusPlus11) break;

  return nullptr;

case UnqualifiedIdKind::IK_DestructorName:
  Diag(Name.getBeginLoc(), diag::err_using_decl_destructor) << SS.getRange();
  return nullptr;

case UnqualifiedIdKind::IK_TemplateId:
  Diag(Name.getBeginLoc(), diag::err_using_decl_template_id)
      << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
  return nullptr;

case UnqualifiedIdKind::IK_DeductionGuideName:
  llvm_unreachable("cannot parse qualified deduction guide name")::llvm::llvm_unreachable_internal("cannot parse qualified deduction guide name"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9508);
}

DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
DeclarationName TargetName = TargetNameInfo.getName();
if (!TargetName)
  return nullptr;

// Warn about access declarations.
if (UsingLoc.isInvalid()) {
  Diag(Name.getBeginLoc(), getLangOpts().CPlusPlus11
                               ? diag::err_access_decl
                               : diag::warn_access_decl_deprecated)
      << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using ");
}

if (EllipsisLoc.isInvalid()) {
  if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) ||
      DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration))
    return nullptr;
} else {
  if (!SS.getScopeRep()->containsUnexpandedParameterPack() &&
      !TargetNameInfo.containsUnexpandedParameterPack()) {
    Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
      << SourceRange(SS.getBeginLoc(), TargetNameInfo.getEndLoc());
    EllipsisLoc = SourceLocation();
  }
}

NamedDecl *UD =
    BuildUsingDeclaration(S, AS, UsingLoc, TypenameLoc.isValid(), TypenameLoc,
                          SS, TargetNameInfo, EllipsisLoc, AttrList,
                          /*IsInstantiation*/false);
if (UD)
  PushOnScopeChains(UD, S, /*AddToContext*/ false);

return UD;
9545}

9547/// Determine whether a using declaration considers the given
9548/// declarations as "equivalent", e.g., if they are redeclarations of
9549/// the same entity or are both typedefs of the same type.
9550static bool
9551IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) {
if (D1->getCanonicalDecl() == D2->getCanonicalDecl())
  return true;

if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1))
  if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2))
    return Context.hasSameType(TD1->getUnderlyingType(),
                               TD2->getUnderlyingType());

return false;
9561}


9564/// Determines whether to create a using shadow decl for a particular
9565/// decl, given the set of decls existing prior to this using lookup.
9566bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
                              const LookupResult &Previous,
                              UsingShadowDecl *&PrevShadow) {
// Diagnose finding a decl which is not from a base class of the
// current class.  We do this now because there are cases where this
// function will silently decide not to build a shadow decl, which
// will pre-empt further diagnostics.
//
// We don't need to do this in C++11 because we do the check once on
// the qualifier.
//
// FIXME: diagnose the following if we care enough:
//   struct A { int foo; };
//   struct B : A { using A::foo; };
//   template <class T> struct C : A {};
//   template <class T> struct D : C<T> { using B::foo; } // <---
// This is invalid (during instantiation) in C++03 because B::foo
// resolves to the using decl in B, which is not a base class of D<T>.
// We can't diagnose it immediately because C<T> is an unknown
// specialization.  The UsingShadowDecl in D<T> then points directly
// to A::foo, which will look well-formed when we instantiate.
// The right solution is to not collapse the shadow-decl chain.
if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) {
  DeclContext *OrigDC = Orig->getDeclContext();

  // Handle enums and anonymous structs.
  if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
  CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
  while (OrigRec->isAnonymousStructOrUnion())
    OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());

  if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
    if (OrigDC == CurContext) {
      Diag(Using->getLocation(),
           diag::err_using_decl_nested_name_specifier_is_current_class)
        << Using->getQualifierLoc().getSourceRange();
      Diag(Orig->getLocation(), diag::note_using_decl_target);
      Using->setInvalidDecl();
      return true;
    }

    Diag(Using->getQualifierLoc().getBeginLoc(),
         diag::err_using_decl_nested_name_specifier_is_not_base_class)
      << Using->getQualifier()
      << cast<CXXRecordDecl>(CurContext)
      << Using->getQualifierLoc().getSourceRange();
    Diag(Orig->getLocation(), diag::note_using_decl_target);
    Using->setInvalidDecl();
    return true;
  }
}

if (Previous.empty()) return false;

NamedDecl *Target = Orig;
if (isa<UsingShadowDecl>(Target))
  Target = cast<UsingShadowDecl>(Target)->getTargetDecl();

// If the target happens to be one of the previous declarations, we
// don't have a conflict.
//
// FIXME: but we might be increasing its access, in which case we
// should redeclare it.
NamedDecl *NonTag = nullptr, *Tag = nullptr;
bool FoundEquivalentDecl = false;
for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
       I != E; ++I) {
  NamedDecl *D = (*I)->getUnderlyingDecl();
  // We can have UsingDecls in our Previous results because we use the same
  // LookupResult for checking whether the UsingDecl itself is a valid
  // redeclaration.
  if (isa<UsingDecl>(D) || isa<UsingPackDecl>(D))
    continue;

  if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
    // C++ [class.mem]p19:
    //   If T is the name of a class, then [every named member other than
    //   a non-static data member] shall have a name different from T
    if (RD->isInjectedClassName() && !isa<FieldDecl>(Target) &&
        !isa<IndirectFieldDecl>(Target) &&
        !isa<UnresolvedUsingValueDecl>(Target) &&
        DiagnoseClassNameShadow(
            CurContext,
            DeclarationNameInfo(Using->getDeclName(), Using->getLocation())))
      return true;
  }

  if (IsEquivalentForUsingDecl(Context, D, Target)) {
    if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I))
      PrevShadow = Shadow;
    FoundEquivalentDecl = true;
  } else if (isEquivalentInternalLinkageDeclaration(D, Target)) {
    // We don't conflict with an existing using shadow decl of an equivalent
    // declaration, but we're not a redeclaration of it.
    FoundEquivalentDecl = true;
  }

  if (isVisible(D))
    (isa<TagDecl>(D) ? Tag : NonTag) = D;
}

if (FoundEquivalentDecl)
  return false;

if (FunctionDecl *FD = Target->getAsFunction()) {
  NamedDecl *OldDecl = nullptr;
  switch (CheckOverload(nullptr, FD, Previous, OldDecl,
                        /*IsForUsingDecl*/ true)) {
  case Ovl_Overload:
    return false;

  case Ovl_NonFunction:
    Diag(Using->getLocation(), diag::err_using_decl_conflict);
    break;

  // We found a decl with the exact signature.
  case Ovl_Match:
    // If we're in a record, we want to hide the target, so we
    // return true (without a diagnostic) to tell the caller not to
    // build a shadow decl.
    if (CurContext->isRecord())
      return true;

    // If we're not in a record, this is an error.
    Diag(Using->getLocation(), diag::err_using_decl_conflict);
    break;
  }

  Diag(Target->getLocation(), diag::note_using_decl_target);
  Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
  Using->setInvalidDecl();
  return true;
}

// Target is not a function.

if (isa<TagDecl>(Target)) {
  // No conflict between a tag and a non-tag.
  if (!Tag) return false;

  Diag(Using->getLocation(), diag::err_using_decl_conflict);
  Diag(Target->getLocation(), diag::note_using_decl_target);
  Diag(Tag->getLocation(), diag::note_using_decl_conflict);
  Using->setInvalidDecl();
  return true;
}

// No conflict between a tag and a non-tag.
if (!NonTag) return false;

Diag(Using->getLocation(), diag::err_using_decl_conflict);
Diag(Target->getLocation(), diag::note_using_decl_target);
Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
Using->setInvalidDecl();
return true;
9721}

9723/// Determine whether a direct base class is a virtual base class.
9724static bool isVirtualDirectBase(CXXRecordDecl *Derived, CXXRecordDecl *Base) {
if (!Derived->getNumVBases())
  return false;
for (auto &B : Derived->bases())
  if (B.getType()->getAsCXXRecordDecl() == Base)
    return B.isVirtual();
llvm_unreachable("not a direct base class")::llvm::llvm_unreachable_internal("not a direct base class", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9730);
9731}

9733/// Builds a shadow declaration corresponding to a 'using' declaration.
9734UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
                                          UsingDecl *UD,
                                          NamedDecl *Orig,
                                          UsingShadowDecl *PrevDecl) {
// If we resolved to another shadow declaration, just coalesce them.
NamedDecl *Target = Orig;
if (isa<UsingShadowDecl>(Target)) {
  Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
  assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration")((!isa<UsingShadowDecl>(Target) && "nested shadow declaration"
) ? static_cast<void> (0) : __assert_fail ("!isa<UsingShadowDecl>(Target) && \"nested shadow declaration\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9742, __PRETTY_FUNCTION__));
}

NamedDecl *NonTemplateTarget = Target;
if (auto *TargetTD = dyn_cast<TemplateDecl>(Target))
  NonTemplateTarget = TargetTD->getTemplatedDecl();

UsingShadowDecl *Shadow;
if (isa<CXXConstructorDecl>(NonTemplateTarget)) {
  bool IsVirtualBase =
      isVirtualDirectBase(cast<CXXRecordDecl>(CurContext),
                          UD->getQualifier()->getAsRecordDecl());
  Shadow = ConstructorUsingShadowDecl::Create(
      Context, CurContext, UD->getLocation(), UD, Orig, IsVirtualBase);
} else {
  Shadow = UsingShadowDecl::Create(Context, CurContext, UD->getLocation(), UD,
                                   Target);
}
UD->addShadowDecl(Shadow);

Shadow->setAccess(UD->getAccess());
if (Orig->isInvalidDecl() || UD->isInvalidDecl())
  Shadow->setInvalidDecl();

Shadow->setPreviousDecl(PrevDecl);

if (S)
  PushOnScopeChains(Shadow, S);
else
  CurContext->addDecl(Shadow);


return Shadow;
9775}

9777/// Hides a using shadow declaration.  This is required by the current
9778/// using-decl implementation when a resolvable using declaration in a
9779/// class is followed by a declaration which would hide or override
9780/// one or more of the using decl's targets; for example:
9781///
9782///   struct Base { void foo(int); };
9783///   struct Derived : Base {
9784///     using Base::foo;
9785///     void foo(int);
9786///   };
9787///
9788/// The governing language is C++03 [namespace.udecl]p12:
9789///
9790///   When a using-declaration brings names from a base class into a
9791///   derived class scope, member functions in the derived class
9792///   override and/or hide member functions with the same name and
9793///   parameter types in a base class (rather than conflicting).
9794///
9795/// There are two ways to implement this:
9796///   (1) optimistically create shadow decls when they're not hidden
9797///       by existing declarations, or
9798///   (2) don't create any shadow decls (or at least don't make them
9799///       visible) until we've fully parsed/instantiated the class.
9800/// The problem with (1) is that we might have to retroactively remove
9801/// a shadow decl, which requires several O(n) operations because the
9802/// decl structures are (very reasonably) not designed for removal.
9803/// (2) avoids this but is very fiddly and phase-dependent.
9804void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
if (Shadow->getDeclName().getNameKind() ==
      DeclarationName::CXXConversionFunctionName)
  cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow);

// Remove it from the DeclContext...
Shadow->getDeclContext()->removeDecl(Shadow);

// ...and the scope, if applicable...
if (S) {
  S->RemoveDecl(Shadow);
  IdResolver.RemoveDecl(Shadow);
}

// ...and the using decl.
Shadow->getUsingDecl()->removeShadowDecl(Shadow);

// TODO: complain somehow if Shadow was used.  It shouldn't
// be possible for this to happen, because...?
9823}

9825/// Find the base specifier for a base class with the given type.
9826static CXXBaseSpecifier *findDirectBaseWithType(CXXRecordDecl *Derived,
                                              QualType DesiredBase,
                                              bool &AnyDependentBases) {
// Check whether the named type is a direct base class.
CanQualType CanonicalDesiredBase = DesiredBase->getCanonicalTypeUnqualified();
for (auto &Base : Derived->bases()) {
  CanQualType BaseType = Base.getType()->getCanonicalTypeUnqualified();
  if (CanonicalDesiredBase == BaseType)
    return &Base;
  if (BaseType->isDependentType())
    AnyDependentBases = true;
}
return nullptr;
9839}

9841namespace {
9842class UsingValidatorCCC final : public CorrectionCandidateCallback {
9843public:
UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation,
                  NestedNameSpecifier *NNS, CXXRecordDecl *RequireMemberOf)
    : HasTypenameKeyword(HasTypenameKeyword),
      IsInstantiation(IsInstantiation), OldNNS(NNS),
      RequireMemberOf(RequireMemberOf) {}

bool ValidateCandidate(const TypoCorrection &Candidate) override {
  NamedDecl *ND = Candidate.getCorrectionDecl();

  // Keywords are not valid here.
  if (!ND || isa<NamespaceDecl>(ND))
    return false;

  // Completely unqualified names are invalid for a 'using' declaration.
  if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier())
    return false;

  // FIXME: Don't correct to a name that CheckUsingDeclRedeclaration would
  // reject.

  if (RequireMemberOf) {
    auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND);
    if (FoundRecord && FoundRecord->isInjectedClassName()) {
      // No-one ever wants a using-declaration to name an injected-class-name
      // of a base class, unless they're declaring an inheriting constructor.
      ASTContext &Ctx = ND->getASTContext();
      if (!Ctx.getLangOpts().CPlusPlus11)
        return false;
      QualType FoundType = Ctx.getRecordType(FoundRecord);

      // Check that the injected-class-name is named as a member of its own
      // type; we don't want to suggest 'using Derived::Base;', since that
      // means something else.
      NestedNameSpecifier *Specifier =
          Candidate.WillReplaceSpecifier()
              ? Candidate.getCorrectionSpecifier()
              : OldNNS;
      if (!Specifier->getAsType() ||
          !Ctx.hasSameType(QualType(Specifier->getAsType(), 0), FoundType))
        return false;

      // Check that this inheriting constructor declaration actually names a
      // direct base class of the current class.
      bool AnyDependentBases = false;
      if (!findDirectBaseWithType(RequireMemberOf,
                                  Ctx.getRecordType(FoundRecord),
                                  AnyDependentBases) &&
          !AnyDependentBases)
        return false;
    } else {
      auto *RD = dyn_cast<CXXRecordDecl>(ND->getDeclContext());
      if (!RD || RequireMemberOf->isProvablyNotDerivedFrom(RD))
        return false;

      // FIXME: Check that the base class member is accessible?
    }
  } else {
    auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND);
    if (FoundRecord && FoundRecord->isInjectedClassName())
      return false;
  }

  if (isa<TypeDecl>(ND))
    return HasTypenameKeyword || !IsInstantiation;

  return !HasTypenameKeyword;
}

std::unique_ptr<CorrectionCandidateCallback> clone() override {
  return llvm::make_unique<UsingValidatorCCC>(*this);
}

9916private:
bool HasTypenameKeyword;
bool IsInstantiation;
NestedNameSpecifier *OldNNS;
CXXRecordDecl *RequireMemberOf;
9921};
9922} // end anonymous namespace

9924/// Builds a using declaration.
9925///
9926/// \param IsInstantiation - Whether this call arises from an
9927///   instantiation of an unresolved using declaration.  We treat
9928///   the lookup differently for these declarations.
9929NamedDecl *Sema::BuildUsingDeclaration(
  Scope *S, AccessSpecifier AS, SourceLocation UsingLoc,
  bool HasTypenameKeyword, SourceLocation TypenameLoc, CXXScopeSpec &SS,
  DeclarationNameInfo NameInfo, SourceLocation EllipsisLoc,
  const ParsedAttributesView &AttrList, bool IsInstantiation) {
assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast
<void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9934, __PRETTY_FUNCTION__));
SourceLocation IdentLoc = NameInfo.getLoc();
assert(IdentLoc.isValid() && "Invalid TargetName location.")((IdentLoc.isValid() && "Invalid TargetName location."
) ? static_cast<void> (0) : __assert_fail ("IdentLoc.isValid() && \"Invalid TargetName location.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9936, __PRETTY_FUNCTION__));

// FIXME: We ignore attributes for now.

// For an inheriting constructor declaration, the name of the using
// declaration is the name of a constructor in this class, not in the
// base class.
DeclarationNameInfo UsingName = NameInfo;
if (UsingName.getName().getNameKind() == DeclarationName::CXXConstructorName)
  if (auto *RD = dyn_cast<CXXRecordDecl>(CurContext))
    UsingName.setName(Context.DeclarationNames.getCXXConstructorName(
        Context.getCanonicalType(Context.getRecordType(RD))));

// Do the redeclaration lookup in the current scope.
LookupResult Previous(*this, UsingName, LookupUsingDeclName,
                      ForVisibleRedeclaration);
Previous.setHideTags(false);
if (S) {
  LookupName(Previous, S);

  // It is really dumb that we have to do this.
  LookupResult::Filter F = Previous.makeFilter();
  while (F.hasNext()) {
    NamedDecl *D = F.next();
    if (!isDeclInScope(D, CurContext, S))
      F.erase();
    // If we found a local extern declaration that's not ordinarily visible,
    // and this declaration is being added to a non-block scope, ignore it.
    // We're only checking for scope conflicts here, not also for violations
    // of the linkage rules.
    else if (!CurContext->isFunctionOrMethod() && D->isLocalExternDecl() &&
             !(D->getIdentifierNamespace() & Decl::IDNS_Ordinary))
      F.erase();
  }
  F.done();
} else {
  assert(IsInstantiation && "no scope in non-instantiation")((IsInstantiation && "no scope in non-instantiation")
 ? static_cast<void> (0) : __assert_fail ("IsInstantiation && \"no scope in non-instantiation\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 9972, __PRETTY_FUNCTION__));
  if (CurContext->isRecord())
    LookupQualifiedName(Previous, CurContext);
  else {
    // No redeclaration check is needed here; in non-member contexts we
    // diagnosed all possible conflicts with other using-declarations when
    // building the template:
    //
    // For a dependent non-type using declaration, the only valid case is
    // if we instantiate to a single enumerator. We check for conflicts
    // between shadow declarations we introduce, and we check in the template
    // definition for conflicts between a non-type using declaration and any
    // other declaration, which together covers all cases.
    //
    // A dependent typename using declaration will never successfully
    // instantiate, since it will always name a class member, so we reject
    // that in the template definition.
  }
}

// Check for invalid redeclarations.
if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword,
                                SS, IdentLoc, Previous))
  return nullptr;

// Check for bad qualifiers.
if (CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, SS, NameInfo,
                            IdentLoc))
  return nullptr;

DeclContext *LookupContext = computeDeclContext(SS);
NamedDecl *D;
NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
if (!LookupContext || EllipsisLoc.isValid()) {
  if (HasTypenameKeyword) {
    // FIXME: not all declaration name kinds are legal here
    D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
                                            UsingLoc, TypenameLoc,
                                            QualifierLoc,
                                            IdentLoc, NameInfo.getName(),
                                            EllipsisLoc);
  } else {
    D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc,
                                         QualifierLoc, NameInfo, EllipsisLoc);
  }
  D->setAccess(AS);
  CurContext->addDecl(D);
  return D;
}

auto Build = [&](bool Invalid) {
  UsingDecl *UD =
      UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc,
                        UsingName, HasTypenameKeyword);
  UD->setAccess(AS);
  CurContext->addDecl(UD);
  UD->setInvalidDecl(Invalid);
  return UD;
};
auto BuildInvalid = [&]{ return Build(true); };
auto BuildValid = [&]{ return Build(false); };

if (RequireCompleteDeclContext(SS, LookupContext))
  return BuildInvalid();

// Look up the target name.
LookupResult R(*this, NameInfo, LookupOrdinaryName);

// Unlike most lookups, we don't always want to hide tag
// declarations: tag names are visible through the using declaration
// even if hidden by ordinary names, *except* in a dependent context
// where it's important for the sanity of two-phase lookup.
if (!IsInstantiation)
  R.setHideTags(false);

// For the purposes of this lookup, we have a base object type
// equal to that of the current context.
if (CurContext->isRecord()) {
  R.setBaseObjectType(
                 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)));
}

LookupQualifiedName(R, LookupContext);

// Try to correct typos if possible. If constructor name lookup finds no
// results, that means the named class has no explicit constructors, and we
// suppressed declaring implicit ones (probably because it's dependent or
// invalid).
if (R.empty() &&
    NameInfo.getName().getNameKind() != DeclarationName::CXXConstructorName) {
  // HACK: Work around a bug in libstdc++'s detection of ::gets. Sometimes
  // it will believe that glibc provides a ::gets in cases where it does not,
  // and will try to pull it into namespace std with a using-declaration.
  // Just ignore the using-declaration in that case.
  auto *II = NameInfo.getName().getAsIdentifierInfo();
  if (getLangOpts().CPlusPlus14 && II && II->isStr("gets") &&
      CurContext->isStdNamespace() &&
      isa<TranslationUnitDecl>(LookupContext) &&
      getSourceManager().isInSystemHeader(UsingLoc))
    return nullptr;
  UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation, SS.getScopeRep(),
                        dyn_cast<CXXRecordDecl>(CurContext));
  if (TypoCorrection Corrected =
          CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC,
                      CTK_ErrorRecovery)) {
    // We reject candidates where DroppedSpecifier == true, hence the
    // literal '0' below.
    diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
                              << NameInfo.getName() << LookupContext << 0
                              << SS.getRange());

    // If we picked a correction with no attached Decl we can't do anything
    // useful with it, bail out.
    NamedDecl *ND = Corrected.getCorrectionDecl();
    if (!ND)
      return BuildInvalid();

    // If we corrected to an inheriting constructor, handle it as one.
    auto *RD = dyn_cast<CXXRecordDecl>(ND);
    if (RD && RD->isInjectedClassName()) {
      // The parent of the injected class name is the class itself.
      RD = cast<CXXRecordDecl>(RD->getParent());

      // Fix up the information we'll use to build the using declaration.
      if (Corrected.WillReplaceSpecifier()) {
        NestedNameSpecifierLocBuilder Builder;
        Builder.MakeTrivial(Context, Corrected.getCorrectionSpecifier(),
                            QualifierLoc.getSourceRange());
        QualifierLoc = Builder.getWithLocInContext(Context);
      }

      // In this case, the name we introduce is the name of a derived class
      // constructor.
      auto *CurClass = cast<CXXRecordDecl>(CurContext);
      UsingName.setName(Context.DeclarationNames.getCXXConstructorName(
          Context.getCanonicalType(Context.getRecordType(CurClass))));
      UsingName.setNamedTypeInfo(nullptr);
      for (auto *Ctor : LookupConstructors(RD))
        R.addDecl(Ctor);
      R.resolveKind();
    } else {
      // FIXME: Pick up all the declarations if we found an overloaded
      // function.
      UsingName.setName(ND->getDeclName());
      R.addDecl(ND);
    }
  } else {
    Diag(IdentLoc, diag::err_no_member)
      << NameInfo.getName() << LookupContext << SS.getRange();
    return BuildInvalid();
  }
}

if (R.isAmbiguous())
  return BuildInvalid();

if (HasTypenameKeyword) {
  // If we asked for a typename and got a non-type decl, error out.
  if (!R.getAsSingle<TypeDecl>()) {
    Diag(IdentLoc, diag::err_using_typename_non_type);
    for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
      Diag((*I)->getUnderlyingDecl()->getLocation(),
           diag::note_using_decl_target);
    return BuildInvalid();
  }
} else {
  // If we asked for a non-typename and we got a type, error out,
  // but only if this is an instantiation of an unresolved using
  // decl.  Otherwise just silently find the type name.
  if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
    Diag(IdentLoc, diag::err_using_dependent_value_is_type);
    Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
    return BuildInvalid();
  }
}

// C++14 [namespace.udecl]p6:
// A using-declaration shall not name a namespace.
if (R.getAsSingle<NamespaceDecl>()) {
  Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
    << SS.getRange();
  return BuildInvalid();
}

// C++14 [namespace.udecl]p7:
// A using-declaration shall not name a scoped enumerator.
if (auto *ED = R.getAsSingle<EnumConstantDecl>()) {
  if (cast<EnumDecl>(ED->getDeclContext())->isScoped()) {
    Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_scoped_enum)
      << SS.getRange();
    return BuildInvalid();
  }
}

UsingDecl *UD = BuildValid();

// Some additional rules apply to inheriting constructors.
if (UsingName.getName().getNameKind() ==
      DeclarationName::CXXConstructorName) {
  // Suppress access diagnostics; the access check is instead performed at the
  // point of use for an inheriting constructor.
  R.suppressDiagnostics();
  if (CheckInheritingConstructorUsingDecl(UD))
    return UD;
}

for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
  UsingShadowDecl *PrevDecl = nullptr;
  if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl))
    BuildUsingShadowDecl(S, UD, *I, PrevDecl);
}

return UD;
10185}

10187NamedDecl *Sema::BuildUsingPackDecl(NamedDecl *InstantiatedFrom,
                                  ArrayRef<NamedDecl *> Expansions) {
assert(isa<UnresolvedUsingValueDecl>(InstantiatedFrom) ||((isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa
<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<
UsingPackDecl>(InstantiatedFrom)) ? static_cast<void>
 (0) : __assert_fail ("isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<UsingPackDecl>(InstantiatedFrom)"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10191, __PRETTY_FUNCTION__))
       isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) ||((isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa
<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<
UsingPackDecl>(InstantiatedFrom)) ? static_cast<void>
 (0) : __assert_fail ("isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<UsingPackDecl>(InstantiatedFrom)"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10191, __PRETTY_FUNCTION__))
       isa<UsingPackDecl>(InstantiatedFrom))((isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa
<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<
UsingPackDecl>(InstantiatedFrom)) ? static_cast<void>
 (0) : __assert_fail ("isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<UsingPackDecl>(InstantiatedFrom)"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10191, __PRETTY_FUNCTION__));

auto *UPD =
    UsingPackDecl::Create(Context, CurContext, InstantiatedFrom, Expansions);
UPD->setAccess(InstantiatedFrom->getAccess());
CurContext->addDecl(UPD);
return UPD;
10198}

10200/// Additional checks for a using declaration referring to a constructor name.
10201bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) {
assert(!UD->hasTypename() && "expecting a constructor name")((!UD->hasTypename() && "expecting a constructor name"
) ? static_cast<void> (0) : __assert_fail ("!UD->hasTypename() && \"expecting a constructor name\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10202, __PRETTY_FUNCTION__));

const Type *SourceType = UD->getQualifier()->getAsType();
assert(SourceType &&((SourceType && "Using decl naming constructor doesn't have type in scope spec."
) ? static_cast<void> (0) : __assert_fail ("SourceType && \"Using decl naming constructor doesn't have type in scope spec.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10206, __PRETTY_FUNCTION__))
       "Using decl naming constructor doesn't have type in scope spec.")((SourceType && "Using decl naming constructor doesn't have type in scope spec."
) ? static_cast<void> (0) : __assert_fail ("SourceType && \"Using decl naming constructor doesn't have type in scope spec.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10206, __PRETTY_FUNCTION__));
CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext);

// Check whether the named type is a direct base class.
bool AnyDependentBases = false;
auto *Base = findDirectBaseWithType(TargetClass, QualType(SourceType, 0),
                                    AnyDependentBases);
if (!Base && !AnyDependentBases) {
  Diag(UD->getUsingLoc(),
       diag::err_using_decl_constructor_not_in_direct_base)
    << UD->getNameInfo().getSourceRange()
    << QualType(SourceType, 0) << TargetClass;
  UD->setInvalidDecl();
  return true;
}

if (Base)
  Base->setInheritConstructors();

return false;
10226}

10228/// Checks that the given using declaration is not an invalid
10229/// redeclaration.  Note that this is checking only for the using decl
10230/// itself, not for any ill-formedness among the UsingShadowDecls.
10231bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
                                     bool HasTypenameKeyword,
                                     const CXXScopeSpec &SS,
                                     SourceLocation NameLoc,
                                     const LookupResult &Prev) {
NestedNameSpecifier *Qual = SS.getScopeRep();

// C++03 [namespace.udecl]p8:
// C++0x [namespace.udecl]p10:
//   A using-declaration is a declaration and can therefore be used
//   repeatedly where (and only where) multiple declarations are
//   allowed.
//
// That's in non-member contexts.
if (!CurContext->getRedeclContext()->isRecord()) {
  // A dependent qualifier outside a class can only ever resolve to an
  // enumeration type. Therefore it conflicts with any other non-type
  // declaration in the same scope.
  // FIXME: How should we check for dependent type-type conflicts at block
  // scope?
  if (Qual->isDependent() && !HasTypenameKeyword) {
    for (auto *D : Prev) {
      if (!isa<TypeDecl>(D) && !isa<UsingDecl>(D) && !isa<UsingPackDecl>(D)) {
        bool OldCouldBeEnumerator =
            isa<UnresolvedUsingValueDecl>(D) || isa<EnumConstantDecl>(D);
        Diag(NameLoc,
             OldCouldBeEnumerator ? diag::err_redefinition
                                  : diag::err_redefinition_different_kind)
            << Prev.getLookupName();
        Diag(D->getLocation(), diag::note_previous_definition);
        return true;
      }
    }
  }
  return false;
}

for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
  NamedDecl *D = *I;

  bool DTypename;
  NestedNameSpecifier *DQual;
  if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
    DTypename = UD->hasTypename();
    DQual = UD->getQualifier();
  } else if (UnresolvedUsingValueDecl *UD
               = dyn_cast<UnresolvedUsingValueDecl>(D)) {
    DTypename = false;
    DQual = UD->getQualifier();
  } else if (UnresolvedUsingTypenameDecl *UD
               = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
    DTypename = true;
    DQual = UD->getQualifier();
  } else continue;

  // using decls differ if one says 'typename' and the other doesn't.
  // FIXME: non-dependent using decls?
  if (HasTypenameKeyword != DTypename) continue;

  // using decls differ if they name different scopes (but note that
  // template instantiation can cause this check to trigger when it
  // didn't before instantiation).
  if (Context.getCanonicalNestedNameSpecifier(Qual) !=
      Context.getCanonicalNestedNameSpecifier(DQual))
    continue;

  Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
  Diag(D->getLocation(), diag::note_using_decl) << 1;
  return true;
}

return false;
10303}


10306/// Checks that the given nested-name qualifier used in a using decl
10307/// in the current context is appropriately related to the current
10308/// scope.  If an error is found, diagnoses it and returns true.
10309bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
                                 bool HasTypename,
                                 const CXXScopeSpec &SS,
                                 const DeclarationNameInfo &NameInfo,
                                 SourceLocation NameLoc) {
DeclContext *NamedContext = computeDeclContext(SS);

if (!CurContext->isRecord()) {
  // C++03 [namespace.udecl]p3:
  // C++0x [namespace.udecl]p8:
  //   A using-declaration for a class member shall be a member-declaration.

  // If we weren't able to compute a valid scope, it might validly be a
  // dependent class scope or a dependent enumeration unscoped scope. If
  // we have a 'typename' keyword, the scope must resolve to a class type.
  if ((HasTypename && !NamedContext) ||
      (NamedContext && NamedContext->getRedeclContext()->isRecord())) {
    auto *RD = NamedContext
                   ? cast<CXXRecordDecl>(NamedContext->getRedeclContext())
                   : nullptr;
    if (RD && RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), RD))
      RD = nullptr;

    Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
      << SS.getRange();

    // If we have a complete, non-dependent source type, try to suggest a
    // way to get the same effect.
    if (!RD)
      return true;

    // Find what this using-declaration was referring to.
    LookupResult R(*this, NameInfo, LookupOrdinaryName);
    R.setHideTags(false);
    R.suppressDiagnostics();
    LookupQualifiedName(R, RD);

    if (R.getAsSingle<TypeDecl>()) {
      if (getLangOpts().CPlusPlus11) {
        // Convert 'using X::Y;' to 'using Y = X::Y;'.
        Diag(SS.getBeginLoc(), diag::note_using_decl_class_member_workaround)
          << 0 // alias declaration
          << FixItHint::CreateInsertion(SS.getBeginLoc(),
                                        NameInfo.getName().getAsString() +
                                            " = ");
      } else {
        // Convert 'using X::Y;' to 'typedef X::Y Y;'.
        SourceLocation InsertLoc = getLocForEndOfToken(NameInfo.getEndLoc());
        Diag(InsertLoc, diag::note_using_decl_class_member_workaround)
          << 1 // typedef declaration
          << FixItHint::CreateReplacement(UsingLoc, "typedef")
          << FixItHint::CreateInsertion(
                 InsertLoc, " " + NameInfo.getName().getAsString());
      }
    } else if (R.getAsSingle<VarDecl>()) {
      // Don't provide a fixit outside C++11 mode; we don't want to suggest
      // repeating the type of the static data member here.
      FixItHint FixIt;
      if (getLangOpts().CPlusPlus11) {
        // Convert 'using X::Y;' to 'auto &Y = X::Y;'.
        FixIt = FixItHint::CreateReplacement(
            UsingLoc, "auto &" + NameInfo.getName().getAsString() + " = ");
      }

      Diag(UsingLoc, diag::note_using_decl_class_member_workaround)
        << 2 // reference declaration
        << FixIt;
    } else if (R.getAsSingle<EnumConstantDecl>()) {
      // Don't provide a fixit outside C++11 mode; we don't want to suggest
      // repeating the type of the enumeration here, and we can't do so if
      // the type is anonymous.
      FixItHint FixIt;
      if (getLangOpts().CPlusPlus11) {
        // Convert 'using X::Y;' to 'auto &Y = X::Y;'.
        FixIt = FixItHint::CreateReplacement(
            UsingLoc,
            "constexpr auto " + NameInfo.getName().getAsString() + " = ");
      }

      Diag(UsingLoc, diag::note_using_decl_class_member_workaround)
        << (getLangOpts().CPlusPlus11 ? 4 : 3) // const[expr] variable
        << FixIt;
    }
    return true;
  }

  // Otherwise, this might be valid.
  return false;
}

// The current scope is a record.

// If the named context is dependent, we can't decide much.
if (!NamedContext) {
  // FIXME: in C++0x, we can diagnose if we can prove that the
  // nested-name-specifier does not refer to a base class, which is
  // still possible in some cases.

  // Otherwise we have to conservatively report that things might be
  // okay.
  return false;
}

if (!NamedContext->isRecord()) {
  // Ideally this would point at the last name in the specifier,
  // but we don't have that level of source info.
  Diag(SS.getRange().getBegin(),
       diag::err_using_decl_nested_name_specifier_is_not_class)
    << SS.getScopeRep() << SS.getRange();
  return true;
}

if (!NamedContext->isDependentContext() &&
    RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext))
  return true;

if (getLangOpts().CPlusPlus11) {
  // C++11 [namespace.udecl]p3:
  //   In a using-declaration used as a member-declaration, the
  //   nested-name-specifier shall name a base class of the class
  //   being defined.

  if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
                               cast<CXXRecordDecl>(NamedContext))) {
    if (CurContext == NamedContext) {
      Diag(NameLoc,
           diag::err_using_decl_nested_name_specifier_is_current_class)
        << SS.getRange();
      return true;
    }

    if (!cast<CXXRecordDecl>(NamedContext)->isInvalidDecl()) {
      Diag(SS.getRange().getBegin(),
           diag::err_using_decl_nested_name_specifier_is_not_base_class)
        << SS.getScopeRep()
        << cast<CXXRecordDecl>(CurContext)
        << SS.getRange();
    }
    return true;
  }

  return false;
}

// C++03 [namespace.udecl]p4:
//   A using-declaration used as a member-declaration shall refer
//   to a member of a base class of the class being defined [etc.].

// Salient point: SS doesn't have to name a base class as long as
// lookup only finds members from base classes.  Therefore we can
// diagnose here only if we can prove that that can't happen,
// i.e. if the class hierarchies provably don't intersect.

// TODO: it would be nice if "definitely valid" results were cached
// in the UsingDecl and UsingShadowDecl so that these checks didn't
// need to be repeated.

llvm::SmallPtrSet<const CXXRecordDecl *, 4> Bases;
auto Collect = [&Bases](const CXXRecordDecl *Base) {
  Bases.insert(Base);
  return true;
};

// Collect all bases. Return false if we find a dependent base.
if (!cast<CXXRecordDecl>(CurContext)->forallBases(Collect))
  return false;

// Returns true if the base is dependent or is one of the accumulated base
// classes.
auto IsNotBase = [&Bases](const CXXRecordDecl *Base) {
  return !Bases.count(Base);
};

// Return false if the class has a dependent base or if it or one
// of its bases is present in the base set of the current context.
if (Bases.count(cast<CXXRecordDecl>(NamedContext)) ||
    !cast<CXXRecordDecl>(NamedContext)->forallBases(IsNotBase))
  return false;

Diag(SS.getRange().getBegin(),
     diag::err_using_decl_nested_name_specifier_is_not_base_class)
  << SS.getScopeRep()
  << cast<CXXRecordDecl>(CurContext)
  << SS.getRange();

return true;
10495}

10497Decl *Sema::ActOnAliasDeclaration(Scope *S, AccessSpecifier AS,
                                MultiTemplateParamsArg TemplateParamLists,
                                SourceLocation UsingLoc, UnqualifiedId &Name,
                                const ParsedAttributesView &AttrList,
                                TypeResult Type, Decl *DeclFromDeclSpec) {
// Skip up to the relevant declaration scope.
while (S->isTemplateParamScope())
  S = S->getParent();
assert((S->getFlags() & Scope::DeclScope) &&(((S->getFlags() & Scope::DeclScope) && "got alias-declaration outside of declaration scope"
) ? static_cast<void> (0) : __assert_fail ("(S->getFlags() & Scope::DeclScope) && \"got alias-declaration outside of declaration scope\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10506, __PRETTY_FUNCTION__))
       "got alias-declaration outside of declaration scope")(((S->getFlags() & Scope::DeclScope) && "got alias-declaration outside of declaration scope"
) ? static_cast<void> (0) : __assert_fail ("(S->getFlags() & Scope::DeclScope) && \"got alias-declaration outside of declaration scope\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10506, __PRETTY_FUNCTION__));

if (Type.isInvalid())
  return nullptr;

bool Invalid = false;
DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name);
TypeSourceInfo *TInfo = nullptr;
GetTypeFromParser(Type.get(), &TInfo);

if (DiagnoseClassNameShadow(CurContext, NameInfo))
  return nullptr;

if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo,
                                    UPPC_DeclarationType)) {
  Invalid = true;
  TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
                                           TInfo->getTypeLoc().getBeginLoc());
}

LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
                      TemplateParamLists.size()
                          ? forRedeclarationInCurContext()
                          : ForVisibleRedeclaration);
LookupName(Previous, S);

// Warn about shadowing the name of a template parameter.
if (Previous.isSingleResult() &&
    Previous.getFoundDecl()->isTemplateParameter()) {
  DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl());
  Previous.clear();
}

assert(Name.Kind == UnqualifiedIdKind::IK_Identifier &&((Name.Kind == UnqualifiedIdKind::IK_Identifier && "name in alias declaration must be an identifier"
) ? static_cast<void> (0) : __assert_fail ("Name.Kind == UnqualifiedIdKind::IK_Identifier && \"name in alias declaration must be an identifier\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10540, __PRETTY_FUNCTION__))
       "name in alias declaration must be an identifier")((Name.Kind == UnqualifiedIdKind::IK_Identifier && "name in alias declaration must be an identifier"
) ? static_cast<void> (0) : __assert_fail ("Name.Kind == UnqualifiedIdKind::IK_Identifier && \"name in alias declaration must be an identifier\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10540, __PRETTY_FUNCTION__));
TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc,
                                             Name.StartLocation,
                                             Name.Identifier, TInfo);

NewTD->setAccess(AS);

if (Invalid)
  NewTD->setInvalidDecl();

ProcessDeclAttributeList(S, NewTD, AttrList);
AddPragmaAttributes(S, NewTD);

CheckTypedefForVariablyModifiedType(S, NewTD);
Invalid |= NewTD->isInvalidDecl();

bool Redeclaration = false;

NamedDecl *NewND;
if (TemplateParamLists.size()) {
  TypeAliasTemplateDecl *OldDecl = nullptr;
  TemplateParameterList *OldTemplateParams = nullptr;

  if (TemplateParamLists.size() != 1) {
    Diag(UsingLoc, diag::err_alias_template_extra_headers)
      << SourceRange(TemplateParamLists[1]->getTemplateLoc(),
       TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc());
  }
  TemplateParameterList *TemplateParams = TemplateParamLists[0];

  // Check that we can declare a template here.
  if (CheckTemplateDeclScope(S, TemplateParams))
    return nullptr;

  // Only consider previous declarations in the same scope.
  FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false,
                       /*ExplicitInstantiationOrSpecialization*/false);
  if (!Previous.empty()) {
    Redeclaration = true;

    OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>();
    if (!OldDecl && !Invalid) {
      Diag(UsingLoc, diag::err_redefinition_different_kind)
        << Name.Identifier;

      NamedDecl *OldD = Previous.getRepresentativeDecl();
      if (OldD->getLocation().isValid())
        Diag(OldD->getLocation(), diag::note_previous_definition);

      Invalid = true;
    }

    if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) {
      if (TemplateParameterListsAreEqual(TemplateParams,
                                         OldDecl->getTemplateParameters(),
                                         /*Complain=*/true,
                                         TPL_TemplateMatch))
        OldTemplateParams =
            OldDecl->getMostRecentDecl()->getTemplateParameters();
      else
        Invalid = true;

      TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl();
      if (!Invalid &&
          !Context.hasSameType(OldTD->getUnderlyingType(),
                               NewTD->getUnderlyingType())) {
        // FIXME: The C++0x standard does not clearly say this is ill-formed,
        // but we can't reasonably accept it.
        Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef)
          << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType();
        if (OldTD->getLocation().isValid())
          Diag(OldTD->getLocation(), diag::note_previous_definition);
        Invalid = true;
      }
    }
  }

  // Merge any previous default template arguments into our parameters,
  // and check the parameter list.
  if (CheckTemplateParameterList(TemplateParams, OldTemplateParams,
                                 TPC_TypeAliasTemplate))
    return nullptr;

  TypeAliasTemplateDecl *NewDecl =
    TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc,
                                  Name.Identifier, TemplateParams,
                                  NewTD);
  NewTD->setDescribedAliasTemplate(NewDecl);

  NewDecl->setAccess(AS);

  if (Invalid)
    NewDecl->setInvalidDecl();
  else if (OldDecl) {
    NewDecl->setPreviousDecl(OldDecl);
    CheckRedeclarationModuleOwnership(NewDecl, OldDecl);
  }

  NewND = NewDecl;
} else {
  if (auto *TD = dyn_cast_or_null<TagDecl>(DeclFromDeclSpec)) {
    setTagNameForLinkagePurposes(TD, NewTD);
    handleTagNumbering(TD, S);
  }
  ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration);
  NewND = NewTD;
}

PushOnScopeChains(NewND, S);
ActOnDocumentableDecl(NewND);
return NewND;
10651}

10653Decl *Sema::ActOnNamespaceAliasDef(Scope *S, SourceLocation NamespaceLoc,
                                 SourceLocation AliasLoc,
                                 IdentifierInfo *Alias, CXXScopeSpec &SS,
                                 SourceLocation IdentLoc,
                                 IdentifierInfo *Ident) {

// Lookup the namespace name.
LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
LookupParsedName(R, S, &SS);

if (R.isAmbiguous())
  return nullptr;

if (R.empty()) {
  if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) {
    Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
    return nullptr;
  }
}
assert(!R.isAmbiguous() && !R.empty())((!R.isAmbiguous() && !R.empty()) ? static_cast<void
> (0) : __assert_fail ("!R.isAmbiguous() && !R.empty()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10672, __PRETTY_FUNCTION__));
NamedDecl *ND = R.getRepresentativeDecl();

// Check if we have a previous declaration with the same name.
LookupResult PrevR(*this, Alias, AliasLoc, LookupOrdinaryName,
                   ForVisibleRedeclaration);
LookupName(PrevR, S);

// Check we're not shadowing a template parameter.
if (PrevR.isSingleResult() && PrevR.getFoundDecl()->isTemplateParameter()) {
  DiagnoseTemplateParameterShadow(AliasLoc, PrevR.getFoundDecl());
  PrevR.clear();
}

// Filter out any other lookup result from an enclosing scope.
FilterLookupForScope(PrevR, CurContext, S, /*ConsiderLinkage*/false,
                     /*AllowInlineNamespace*/false);

// Find the previous declaration and check that we can redeclare it.
NamespaceAliasDecl *Prev = nullptr;
if (PrevR.isSingleResult()) {
  NamedDecl *PrevDecl = PrevR.getRepresentativeDecl();
  if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
    // We already have an alias with the same name that points to the same
    // namespace; check that it matches.
    if (AD->getNamespace()->Equals(getNamespaceDecl(ND))) {
      Prev = AD;
    } else if (isVisible(PrevDecl)) {
      Diag(AliasLoc, diag::err_redefinition_different_namespace_alias)
        << Alias;
      Diag(AD->getLocation(), diag::note_previous_namespace_alias)
        << AD->getNamespace();
      return nullptr;
    }
  } else if (isVisible(PrevDecl)) {
    unsigned DiagID = isa<NamespaceDecl>(PrevDecl->getUnderlyingDecl())
                          ? diag::err_redefinition
                          : diag::err_redefinition_different_kind;
    Diag(AliasLoc, DiagID) << Alias;
    Diag(PrevDecl->getLocation(), diag::note_previous_definition);
    return nullptr;
  }
}

// The use of a nested name specifier may trigger deprecation warnings.
DiagnoseUseOfDecl(ND, IdentLoc);

NamespaceAliasDecl *AliasDecl =
  NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
                             Alias, SS.getWithLocInContext(Context),
                             IdentLoc, ND);
if (Prev)
  AliasDecl->setPreviousDecl(Prev);

PushOnScopeChains(AliasDecl, S);
return AliasDecl;
10728}

10730namespace {
10731struct SpecialMemberExceptionSpecInfo
  : SpecialMemberVisitor<SpecialMemberExceptionSpecInfo> {
SourceLocation Loc;
Sema::ImplicitExceptionSpecification ExceptSpec;

SpecialMemberExceptionSpecInfo(Sema &S, CXXMethodDecl *MD,
                               Sema::CXXSpecialMember CSM,
                               Sema::InheritedConstructorInfo *ICI,
                               SourceLocation Loc)
    : SpecialMemberVisitor(S, MD, CSM, ICI), Loc(Loc), ExceptSpec(S) {}

bool visitBase(CXXBaseSpecifier *Base);
bool visitField(FieldDecl *FD);

void visitClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
                         unsigned Quals);

void visitSubobjectCall(Subobject Subobj,
                        Sema::SpecialMemberOverloadResult SMOR);
10750};
10751}

10753bool SpecialMemberExceptionSpecInfo::visitBase(CXXBaseSpecifier *Base) {
auto *RT = Base->getType()->getAs<RecordType>();
if (!RT)
  return false;

auto *BaseClass = cast<CXXRecordDecl>(RT->getDecl());
Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass);
if (auto *BaseCtor = SMOR.getMethod()) {
  visitSubobjectCall(Base, BaseCtor);
  return false;
}

visitClassSubobject(BaseClass, Base, 0);
return false;
10767}

10769bool SpecialMemberExceptionSpecInfo::visitField(FieldDecl *FD) {
if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) {
  Expr *E = FD->getInClassInitializer();
  if (!E)
    // FIXME: It's a little wasteful to build and throw away a
    // CXXDefaultInitExpr here.
    // FIXME: We should have a single context note pointing at Loc, and
    // this location should be MD->getLocation() instead, since that's
    // the location where we actually use the default init expression.
    E = S.BuildCXXDefaultInitExpr(Loc, FD).get();
  if (E)
    ExceptSpec.CalledExpr(E);
} else if (auto *RT = S.Context.getBaseElementType(FD->getType())
                          ->getAs<RecordType>()) {
  visitClassSubobject(cast<CXXRecordDecl>(RT->getDecl()), FD,
                      FD->getType().getCVRQualifiers());
}
return false;
10787}

10789void SpecialMemberExceptionSpecInfo::visitClassSubobject(CXXRecordDecl *Class,
                                                       Subobject Subobj,
                                                       unsigned Quals) {
FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
bool IsMutable = Field && Field->isMutable();
visitSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable));
10795}

10797void SpecialMemberExceptionSpecInfo::visitSubobjectCall(
  Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR) {
// Note, if lookup fails, it doesn't matter what exception specification we
// choose because the special member will be deleted.
if (CXXMethodDecl *MD = SMOR.getMethod())
  ExceptSpec.CalledDecl(getSubobjectLoc(Subobj), MD);
10803}

10805namespace {
10806/// RAII object to register a special member as being currently declared.
10807struct ComputingExceptionSpec {
Sema &S;

ComputingExceptionSpec(Sema &S, CXXMethodDecl *MD, SourceLocation Loc)
    : S(S) {
  Sema::CodeSynthesisContext Ctx;
  Ctx.Kind = Sema::CodeSynthesisContext::ExceptionSpecEvaluation;
  Ctx.PointOfInstantiation = Loc;
  Ctx.Entity = MD;
  S.pushCodeSynthesisContext(Ctx);
}
~ComputingExceptionSpec() {
  S.popCodeSynthesisContext();
}
10821};
10822}

10824bool Sema::tryResolveExplicitSpecifier(ExplicitSpecifier &ExplicitSpec) {
llvm::APSInt Result;
ExprResult Converted = CheckConvertedConstantExpression(
    ExplicitSpec.getExpr(), Context.BoolTy, Result, CCEK_ExplicitBool);
ExplicitSpec.setExpr(Converted.get());
if (Converted.isUsable() && !Converted.get()->isValueDependent()) {
  ExplicitSpec.setKind(Result.getBoolValue()
                           ? ExplicitSpecKind::ResolvedTrue
                           : ExplicitSpecKind::ResolvedFalse);
  return true;
}
ExplicitSpec.setKind(ExplicitSpecKind::Unresolved);
return false;
10837}

10839ExplicitSpecifier Sema::ActOnExplicitBoolSpecifier(Expr *ExplicitExpr) {
ExplicitSpecifier ES(ExplicitExpr, ExplicitSpecKind::Unresolved);
if (!ExplicitExpr->isTypeDependent())
  tryResolveExplicitSpecifier(ES);
return ES;
10844}

10846static Sema::ImplicitExceptionSpecification
10847ComputeDefaultedSpecialMemberExceptionSpec(
  Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM,
  Sema::InheritedConstructorInfo *ICI) {
ComputingExceptionSpec CES(S, MD, Loc);

CXXRecordDecl *ClassDecl = MD->getParent();

// C++ [except.spec]p14:
//   An implicitly declared special member function (Clause 12) shall have an
//   exception-specification. [...]
SpecialMemberExceptionSpecInfo Info(S, MD, CSM, ICI, MD->getLocation());
if (ClassDecl->isInvalidDecl())
  return Info.ExceptSpec;

// FIXME: If this diagnostic fires, we're probably missing a check for
// attempting to resolve an exception specification before it's known
// at a higher level.
if (S.RequireCompleteType(MD->getLocation(),
                          S.Context.getRecordType(ClassDecl),
                          diag::err_exception_spec_incomplete_type))
  return Info.ExceptSpec;

// C++1z [except.spec]p7:
//   [Look for exceptions thrown by] a constructor selected [...] to
//   initialize a potentially constructed subobject,
// C++1z [except.spec]p8:
//   The exception specification for an implicitly-declared destructor, or a
//   destructor without a noexcept-specifier, is potentially-throwing if and
//   only if any of the destructors for any of its potentially constructed
//   subojects is potentially throwing.
// FIXME: We respect the first rule but ignore the "potentially constructed"
// in the second rule to resolve a core issue (no number yet) that would have
// us reject:
//   struct A { virtual void f() = 0; virtual ~A() noexcept(false) = 0; };
//   struct B : A {};
//   struct C : B { void f(); };
// ... due to giving B::~B() a non-throwing exception specification.
Info.visit(Info.IsConstructor ? Info.VisitPotentiallyConstructedBases
                              : Info.VisitAllBases);

return Info.ExceptSpec;
10888}

10890namespace {
10891/// RAII object to register a special member as being currently declared.
10892struct DeclaringSpecialMember {
Sema &S;
Sema::SpecialMemberDecl D;
Sema::ContextRAII SavedContext;
bool WasAlreadyBeingDeclared;

DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM)
    : S(S), D(RD, CSM), SavedContext(S, RD) {
  WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D).second;
  if (WasAlreadyBeingDeclared)
    // This almost never happens, but if it does, ensure that our cache
    // doesn't contain a stale result.
    S.SpecialMemberCache.clear();
  else {
    // Register a note to be produced if we encounter an error while
    // declaring the special member.
    Sema::CodeSynthesisContext Ctx;
    Ctx.Kind = Sema::CodeSynthesisContext::DeclaringSpecialMember;
    // FIXME: We don't have a location to use here. Using the class's
    // location maintains the fiction that we declare all special members
    // with the class, but (1) it's not clear that lying about that helps our
    // users understand what's going on, and (2) there may be outer contexts
    // on the stack (some of which are relevant) and printing them exposes
    // our lies.
    Ctx.PointOfInstantiation = RD->getLocation();
    Ctx.Entity = RD;
    Ctx.SpecialMember = CSM;
    S.pushCodeSynthesisContext(Ctx);
  }
}
~DeclaringSpecialMember() {
  if (!WasAlreadyBeingDeclared) {
    S.SpecialMembersBeingDeclared.erase(D);
    S.popCodeSynthesisContext();
  }
}

/// Are we already trying to declare this special member?
bool isAlreadyBeingDeclared() const {
  return WasAlreadyBeingDeclared;
}
10933};
10934}

10936void Sema::CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD) {
// Look up any existing declarations, but don't trigger declaration of all
// implicit special members with this name.
DeclarationName Name = FD->getDeclName();
LookupResult R(*this, Name, SourceLocation(), LookupOrdinaryName,
               ForExternalRedeclaration);
for (auto *D : FD->getParent()->lookup(Name))
  if (auto *Acceptable = R.getAcceptableDecl(D))
    R.addDecl(Acceptable);
R.resolveKind();
R.suppressDiagnostics();

CheckFunctionDeclaration(S, FD, R, /*IsMemberSpecialization*/false);
10949}

10951void Sema::setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem,
                                        QualType ResultTy,
                                        ArrayRef<QualType> Args) {
// Build an exception specification pointing back at this constructor.
FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, SpecialMem);

if (getLangOpts().OpenCLCPlusPlus) {
  // OpenCL: Implicitly defaulted special member are of the generic address
  // space.
  EPI.TypeQuals.addAddressSpace(LangAS::opencl_generic);
}

auto QT = Context.getFunctionType(ResultTy, Args, EPI);
SpecialMem->setType(QT);
10965}

10967CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor(
                                                   CXXRecordDecl *ClassDecl) {
// C++ [class.ctor]p5:
//   A default constructor for a class X is a constructor of class X
//   that can be called without an argument. If there is no
//   user-declared constructor for class X, a default constructor is
//   implicitly declared. An implicitly-declared default constructor
//   is an inline public member of its class.
assert(ClassDecl->needsImplicitDefaultConstructor() &&((ClassDecl->needsImplicitDefaultConstructor() && "Should not build implicit default constructor!"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->needsImplicitDefaultConstructor() && \"Should not build implicit default constructor!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10976, __PRETTY_FUNCTION__))
       "Should not build implicit default constructor!")((ClassDecl->needsImplicitDefaultConstructor() && "Should not build implicit default constructor!"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->needsImplicitDefaultConstructor() && \"Should not build implicit default constructor!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 10976, __PRETTY_FUNCTION__));

DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor);
if (DSM.isAlreadyBeingDeclared())
  return nullptr;

bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
                                                   CXXDefaultConstructor,
                                                   false);

// Create the actual constructor declaration.
CanQualType ClassType
  = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
SourceLocation ClassLoc = ClassDecl->getLocation();
DeclarationName Name
  = Context.DeclarationNames.getCXXConstructorName(ClassType);
DeclarationNameInfo NameInfo(Name, ClassLoc);
CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create(
    Context, ClassDecl, ClassLoc, NameInfo, /*Type*/ QualType(),
    /*TInfo=*/nullptr, ExplicitSpecifier(),
    /*isInline=*/true, /*isImplicitlyDeclared=*/true, Constexpr);
DefaultCon->setAccess(AS_public);
DefaultCon->setDefaulted();

if (getLangOpts().CUDA) {
  inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDefaultConstructor,
                                          DefaultCon,
                                          /* ConstRHS */ false,
                                          /* Diagnose */ false);
}

setupImplicitSpecialMemberType(DefaultCon, Context.VoidTy, None);

// We don't need to use SpecialMemberIsTrivial here; triviality for default
// constructors is easy to compute.
DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor());

// Note that we have declared this constructor.
++getASTContext().NumImplicitDefaultConstructorsDeclared;

Scope *S = getScopeForContext(ClassDecl);
CheckImplicitSpecialMemberDeclaration(S, DefaultCon);

if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor))
  SetDeclDeleted(DefaultCon, ClassLoc);

if (S)
  PushOnScopeChains(DefaultCon, S, false);
ClassDecl->addDecl(DefaultCon);

return DefaultCon;
11027}

11029void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
                                          CXXConstructorDecl *Constructor) {
assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&(((Constructor->isDefaulted() && Constructor->isDefaultConstructor
() && !Constructor->doesThisDeclarationHaveABody()
 && !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor"
) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11034, __PRETTY_FUNCTION__))
        !Constructor->doesThisDeclarationHaveABody() &&(((Constructor->isDefaulted() && Constructor->isDefaultConstructor
() && !Constructor->doesThisDeclarationHaveABody()
 && !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor"
) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11034, __PRETTY_FUNCTION__))
        !Constructor->isDeleted()) &&(((Constructor->isDefaulted() && Constructor->isDefaultConstructor
() && !Constructor->doesThisDeclarationHaveABody()
 && !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor"
) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11034, __PRETTY_FUNCTION__))
  "DefineImplicitDefaultConstructor - call it for implicit default ctor")(((Constructor->isDefaulted() && Constructor->isDefaultConstructor
() && !Constructor->doesThisDeclarationHaveABody()
 && !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor"
) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11034, __PRETTY_FUNCTION__));
if (Constructor->willHaveBody() || Constructor->isInvalidDecl())
  return;

CXXRecordDecl *ClassDecl = Constructor->getParent();
assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor")((ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDefaultConstructor - invalid constructor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11039, __PRETTY_FUNCTION__));

SynthesizedFunctionScope Scope(*this, Constructor);

// The exception specification is needed because we are defining the
// function.
ResolveExceptionSpec(CurrentLocation,
                     Constructor->getType()->castAs<FunctionProtoType>());
MarkVTableUsed(CurrentLocation, ClassDecl);

// Add a context note for diagnostics produced after this point.
Scope.addContextNote(CurrentLocation);

if (SetCtorInitializers(Constructor, /*AnyErrors=*/false)) {
  Constructor->setInvalidDecl();
  return;
}

SourceLocation Loc = Constructor->getEndLoc().isValid()
                         ? Constructor->getEndLoc()
                         : Constructor->getLocation();
Constructor->setBody(new (Context) CompoundStmt(Loc));
Constructor->markUsed(Context);

if (ASTMutationListener *L = getASTMutationListener()) {
  L->CompletedImplicitDefinition(Constructor);
}

DiagnoseUninitializedFields(*this, Constructor);
11068}

11070void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) {
// Perform any delayed checks on exception specifications.
CheckDelayedMemberExceptionSpecs();
11073}

11075/// Find or create the fake constructor we synthesize to model constructing an
11076/// object of a derived class via a constructor of a base class.
11077CXXConstructorDecl *
11078Sema::findInheritingConstructor(SourceLocation Loc,
                              CXXConstructorDecl *BaseCtor,
                              ConstructorUsingShadowDecl *Shadow) {
CXXRecordDecl *Derived = Shadow->getParent();
SourceLocation UsingLoc = Shadow->getLocation();

// FIXME: Add a new kind of DeclarationName for an inherited constructor.
// For now we use the name of the base class constructor as a member of the
// derived class to indicate a (fake) inherited constructor name.
DeclarationName Name = BaseCtor->getDeclName();

// Check to see if we already have a fake constructor for this inherited
// constructor call.
for (NamedDecl *Ctor : Derived->lookup(Name))
  if (declaresSameEntity(cast<CXXConstructorDecl>(Ctor)
                             ->getInheritedConstructor()
                             .getConstructor(),
                         BaseCtor))
    return cast<CXXConstructorDecl>(Ctor);

DeclarationNameInfo NameInfo(Name, UsingLoc);
TypeSourceInfo *TInfo =
    Context.getTrivialTypeSourceInfo(BaseCtor->getType(), UsingLoc);
FunctionProtoTypeLoc ProtoLoc =
    TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>();

// Check the inherited constructor is valid and find the list of base classes
// from which it was inherited.
InheritedConstructorInfo ICI(*this, Loc, Shadow);

bool Constexpr =
    BaseCtor->isConstexpr() &&
    defaultedSpecialMemberIsConstexpr(*this, Derived, CXXDefaultConstructor,
                                      false, BaseCtor, &ICI);

CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create(
    Context, Derived, UsingLoc, NameInfo, TInfo->getType(), TInfo,
    BaseCtor->getExplicitSpecifier(), /*Inline=*/true,
    /*ImplicitlyDeclared=*/true, Constexpr,
    InheritedConstructor(Shadow, BaseCtor));
if (Shadow->isInvalidDecl())
  DerivedCtor->setInvalidDecl();

// Build an unevaluated exception specification for this fake constructor.
const FunctionProtoType *FPT = TInfo->getType()->castAs<FunctionProtoType>();
FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
EPI.ExceptionSpec.Type = EST_Unevaluated;
EPI.ExceptionSpec.SourceDecl = DerivedCtor;
DerivedCtor->setType(Context.getFunctionType(FPT->getReturnType(),
                                             FPT->getParamTypes(), EPI));

// Build the parameter declarations.
SmallVector<ParmVarDecl *, 16> ParamDecls;
for (unsigned I = 0, N = FPT->getNumParams(); I != N; ++I) {
  TypeSourceInfo *TInfo =
      Context.getTrivialTypeSourceInfo(FPT->getParamType(I), UsingLoc);
  ParmVarDecl *PD = ParmVarDecl::Create(
      Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/nullptr,
      FPT->getParamType(I), TInfo, SC_None, /*DefaultArg=*/nullptr);
  PD->setScopeInfo(0, I);
  PD->setImplicit();
  // Ensure attributes are propagated onto parameters (this matters for
  // format, pass_object_size, ...).
  mergeDeclAttributes(PD, BaseCtor->getParamDecl(I));
  ParamDecls.push_back(PD);
  ProtoLoc.setParam(I, PD);
}

// Set up the new constructor.
assert(!BaseCtor->isDeleted() && "should not use deleted constructor")((!BaseCtor->isDeleted() && "should not use deleted constructor"
) ? static_cast<void> (0) : __assert_fail ("!BaseCtor->isDeleted() && \"should not use deleted constructor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11147, __PRETTY_FUNCTION__));
DerivedCtor->setAccess(BaseCtor->getAccess());
DerivedCtor->setParams(ParamDecls);
Derived->addDecl(DerivedCtor);

if (ShouldDeleteSpecialMember(DerivedCtor, CXXDefaultConstructor, &ICI))
  SetDeclDeleted(DerivedCtor, UsingLoc);

return DerivedCtor;
11156}

11158void Sema::NoteDeletedInheritingConstructor(CXXConstructorDecl *Ctor) {
InheritedConstructorInfo ICI(*this, Ctor->getLocation(),
                             Ctor->getInheritedConstructor().getShadowDecl());
ShouldDeleteSpecialMember(Ctor, CXXDefaultConstructor, &ICI,
                          /*Diagnose*/true);
11163}

11165void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation,
                                     CXXConstructorDecl *Constructor) {
CXXRecordDecl *ClassDecl = Constructor->getParent();
assert(Constructor->getInheritedConstructor() &&((Constructor->getInheritedConstructor() && !Constructor
->doesThisDeclarationHaveABody() && !Constructor->
isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11170, __PRETTY_FUNCTION__))
1
Assuming the condition is true→
2
←
Assuming the condition is true→
3
←
Assuming the condition is true→
4
←
'?' condition is true→
       !Constructor->doesThisDeclarationHaveABody() &&((Constructor->getInheritedConstructor() && !Constructor
->doesThisDeclarationHaveABody() && !Constructor->
isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11170, __PRETTY_FUNCTION__))
       !Constructor->isDeleted())((Constructor->getInheritedConstructor() && !Constructor
->doesThisDeclarationHaveABody() && !Constructor->
isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11170, __PRETTY_FUNCTION__));
if (Constructor->willHaveBody() || Constructor->isInvalidDecl())
5
←
Assuming the condition is false→
6
←
Assuming the condition is false→
7
←
Taking false branch→
  return;

// Initializations are performed "as if by a defaulted default constructor",
// so enter the appropriate scope.
SynthesizedFunctionScope Scope(*this, Constructor);

// The exception specification is needed because we are defining the
// function.
ResolveExceptionSpec(CurrentLocation,
                     Constructor->getType()->castAs<FunctionProtoType>());
MarkVTableUsed(CurrentLocation, ClassDecl);

// Add a context note for diagnostics produced after this point.
Scope.addContextNote(CurrentLocation);
8
←
Calling 'SynthesizedFunctionScope::addContextNote'→

ConstructorUsingShadowDecl *Shadow =
    Constructor->getInheritedConstructor().getShadowDecl();
CXXConstructorDecl *InheritedCtor =
    Constructor->getInheritedConstructor().getConstructor();

// [class.inhctor.init]p1:
//   initialization proceeds as if a defaulted default constructor is used to
//   initialize the D object and each base class subobject from which the
//   constructor was inherited

InheritedConstructorInfo ICI(*this, CurrentLocation, Shadow);
CXXRecordDecl *RD = Shadow->getParent();
SourceLocation InitLoc = Shadow->getLocation();

// Build explicit initializers for all base classes from which the
// constructor was inherited.
SmallVector<CXXCtorInitializer*, 8> Inits;
for (bool VBase : {false, true}) {
  for (CXXBaseSpecifier &B : VBase ? RD->vbases() : RD->bases()) {
    if (B.isVirtual() != VBase)
      continue;

    auto *BaseRD = B.getType()->getAsCXXRecordDecl();
    if (!BaseRD)
      continue;

    auto BaseCtor = ICI.findConstructorForBase(BaseRD, InheritedCtor);
    if (!BaseCtor.first)
      continue;

    MarkFunctionReferenced(CurrentLocation, BaseCtor.first);
    ExprResult Init = new (Context) CXXInheritedCtorInitExpr(
        InitLoc, B.getType(), BaseCtor.first, VBase, BaseCtor.second);

    auto *TInfo = Context.getTrivialTypeSourceInfo(B.getType(), InitLoc);
    Inits.push_back(new (Context) CXXCtorInitializer(
        Context, TInfo, VBase, InitLoc, Init.get(), InitLoc,
        SourceLocation()));
  }
}

// We now proceed as if for a defaulted default constructor, with the relevant
// initializers replaced.

if (SetCtorInitializers(Constructor, /*AnyErrors*/false, Inits)) {
  Constructor->setInvalidDecl();
  return;
}

Constructor->setBody(new (Context) CompoundStmt(InitLoc));
Constructor->markUsed(Context);

if (ASTMutationListener *L = getASTMutationListener()) {
  L->CompletedImplicitDefinition(Constructor);
}

DiagnoseUninitializedFields(*this, Constructor);
11244}

11246CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) {
// C++ [class.dtor]p2:
//   If a class has no user-declared destructor, a destructor is
//   declared implicitly. An implicitly-declared destructor is an
//   inline public member of its class.
assert(ClassDecl->needsImplicitDestructor())((ClassDecl->needsImplicitDestructor()) ? static_cast<void
> (0) : __assert_fail ("ClassDecl->needsImplicitDestructor()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11251, __PRETTY_FUNCTION__));

DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor);
if (DSM.isAlreadyBeingDeclared())
  return nullptr;

// Create the actual destructor declaration.
CanQualType ClassType
  = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
SourceLocation ClassLoc = ClassDecl->getLocation();
DeclarationName Name
  = Context.DeclarationNames.getCXXDestructorName(ClassType);
DeclarationNameInfo NameInfo(Name, ClassLoc);
CXXDestructorDecl *Destructor
    = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
                                QualType(), nullptr, /*isInline=*/true,
                                /*isImplicitlyDeclared=*/true);
Destructor->setAccess(AS_public);
Destructor->setDefaulted();

if (getLangOpts().CUDA) {
  inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDestructor,
                                          Destructor,
                                          /* ConstRHS */ false,
                                          /* Diagnose */ false);
}

setupImplicitSpecialMemberType(Destructor, Context.VoidTy, None);

// We don't need to use SpecialMemberIsTrivial here; triviality for
// destructors is easy to compute.
Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
Destructor->setTrivialForCall(ClassDecl->hasAttr<TrivialABIAttr>() ||
                              ClassDecl->hasTrivialDestructorForCall());

// Note that we have declared this destructor.
++getASTContext().NumImplicitDestructorsDeclared;

Scope *S = getScopeForContext(ClassDecl);
CheckImplicitSpecialMemberDeclaration(S, Destructor);

// We can't check whether an implicit destructor is deleted before we complete
// the definition of the class, because its validity depends on the alignment
// of the class. We'll check this from ActOnFields once the class is complete.
if (ClassDecl->isCompleteDefinition() &&
    ShouldDeleteSpecialMember(Destructor, CXXDestructor))
  SetDeclDeleted(Destructor, ClassLoc);

// Introduce this destructor into its scope.
if (S)
  PushOnScopeChains(Destructor, S, false);
ClassDecl->addDecl(Destructor);

return Destructor;
11305}

11307void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
                                  CXXDestructorDecl *Destructor) {
assert((Destructor->isDefaulted() &&(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody
() && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor"
) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11312, __PRETTY_FUNCTION__))
        !Destructor->doesThisDeclarationHaveABody() &&(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody
() && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor"
) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11312, __PRETTY_FUNCTION__))
        !Destructor->isDeleted()) &&(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody
() && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor"
) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11312, __PRETTY_FUNCTION__))
       "DefineImplicitDestructor - call it for implicit default dtor")(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody
() && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor"
) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11312, __PRETTY_FUNCTION__));
if (Destructor->willHaveBody() || Destructor->isInvalidDecl())
  return;

CXXRecordDecl *ClassDecl = Destructor->getParent();
assert(ClassDecl && "DefineImplicitDestructor - invalid destructor")((ClassDecl && "DefineImplicitDestructor - invalid destructor"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDestructor - invalid destructor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11317, __PRETTY_FUNCTION__));

SynthesizedFunctionScope Scope(*this, Destructor);

// The exception specification is needed because we are defining the
// function.
ResolveExceptionSpec(CurrentLocation,
                     Destructor->getType()->castAs<FunctionProtoType>());
MarkVTableUsed(CurrentLocation, ClassDecl);

// Add a context note for diagnostics produced after this point.
Scope.addContextNote(CurrentLocation);

MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
                                       Destructor->getParent());

if (CheckDestructor(Destructor)) {
  Destructor->setInvalidDecl();
  return;
}

SourceLocation Loc = Destructor->getEndLoc().isValid()
                         ? Destructor->getEndLoc()
                         : Destructor->getLocation();
Destructor->setBody(new (Context) CompoundStmt(Loc));
Destructor->markUsed(Context);

if (ASTMutationListener *L = getASTMutationListener()) {
  L->CompletedImplicitDefinition(Destructor);
}
11347}

11349/// Perform any semantic analysis which needs to be delayed until all
11350/// pending class member declarations have been parsed.
11351void Sema::ActOnFinishCXXMemberDecls() {
// If the context is an invalid C++ class, just suppress these checks.
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) {
  if (Record->isInvalidDecl()) {
    DelayedOverridingExceptionSpecChecks.clear();
    DelayedEquivalentExceptionSpecChecks.clear();
    return;
  }
  checkForMultipleExportedDefaultConstructors(*this, Record);
}
11361}

11363void Sema::ActOnFinishCXXNonNestedClass(Decl *D) {
referenceDLLExportedClassMethods();
11365}

11367void Sema::referenceDLLExportedClassMethods() {
if (!DelayedDllExportClasses.empty()) {
  // Calling ReferenceDllExportedMembers might cause the current function to
  // be called again, so use a local copy of DelayedDllExportClasses.
  SmallVector<CXXRecordDecl *, 4> WorkList;
  std::swap(DelayedDllExportClasses, WorkList);
  for (CXXRecordDecl *Class : WorkList)
    ReferenceDllExportedMembers(*this, Class);
}
11376}

11378void Sema::AdjustDestructorExceptionSpec(CXXDestructorDecl *Destructor) {
assert(getLangOpts().CPlusPlus11 &&((getLangOpts().CPlusPlus11 && "adjusting dtor exception specs was introduced in c++11"
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus11 && \"adjusting dtor exception specs was introduced in c++11\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11380, __PRETTY_FUNCTION__))
       "adjusting dtor exception specs was introduced in c++11")((getLangOpts().CPlusPlus11 && "adjusting dtor exception specs was introduced in c++11"
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus11 && \"adjusting dtor exception specs was introduced in c++11\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11380, __PRETTY_FUNCTION__));

if (Destructor->isDependentContext())
  return;

// C++11 [class.dtor]p3:
//   A declaration of a destructor that does not have an exception-
//   specification is implicitly considered to have the same exception-
//   specification as an implicit declaration.
const FunctionProtoType *DtorType = Destructor->getType()->
                                      getAs<FunctionProtoType>();
if (DtorType->hasExceptionSpec())
  return;

// Replace the destructor's type, building off the existing one. Fortunately,
// the only thing of interest in the destructor type is its extended info.
// The return and arguments are fixed.
FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo();
EPI.ExceptionSpec.Type = EST_Unevaluated;
EPI.ExceptionSpec.SourceDecl = Destructor;
Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI));

// FIXME: If the destructor has a body that could throw, and the newly created
// spec doesn't allow exceptions, we should emit a warning, because this
// change in behavior can break conforming C++03 programs at runtime.
// However, we don't have a body or an exception specification yet, so it
// needs to be done somewhere else.
11407}

11409namespace {
11410/// An abstract base class for all helper classes used in building the
11411//  copy/move operators. These classes serve as factory functions and help us
11412//  avoid using the same Expr* in the AST twice.
11413class ExprBuilder {
ExprBuilder(const ExprBuilder&) = delete;
ExprBuilder &operator=(const ExprBuilder&) = delete;

11417protected:
static Expr *assertNotNull(Expr *E) {
  assert(E && "Expression construction must not fail.")((E && "Expression construction must not fail.") ? static_cast
<void> (0) : __assert_fail ("E && \"Expression construction must not fail.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11419, __PRETTY_FUNCTION__));
  return E;
}

11423public:
ExprBuilder() {}
virtual ~ExprBuilder() {}

virtual Expr *build(Sema &S, SourceLocation Loc) const = 0;
11428};

11430class RefBuilder: public ExprBuilder {
VarDecl *Var;
QualType VarType;

11434public:
Expr *build(Sema &S, SourceLocation Loc) const override {
  return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc).get());
}

RefBuilder(VarDecl *Var, QualType VarType)
    : Var(Var), VarType(VarType) {}
11441};

11443class ThisBuilder: public ExprBuilder {
11444public:
Expr *build(Sema &S, SourceLocation Loc) const override {
  return assertNotNull(S.ActOnCXXThis(Loc).getAs<Expr>());
}
11448};

11450class CastBuilder: public ExprBuilder {
const ExprBuilder &Builder;
QualType Type;
ExprValueKind Kind;
const CXXCastPath &Path;

11456public:
Expr *build(Sema &S, SourceLocation Loc) const override {
  return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type,
                                           CK_UncheckedDerivedToBase, Kind,
                                           &Path).get());
}

CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind,
            const CXXCastPath &Path)
    : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {}
11466};

11468class DerefBuilder: public ExprBuilder {
const ExprBuilder &Builder;

11471public:
Expr *build(Sema &S, SourceLocation Loc) const override {
  return assertNotNull(
      S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).get());
}

DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
11478};

11480class MemberBuilder: public ExprBuilder {
const ExprBuilder &Builder;
QualType Type;
CXXScopeSpec SS;
bool IsArrow;
LookupResult &MemberLookup;

11487public:
Expr *build(Sema &S, SourceLocation Loc) const override {
  return assertNotNull(S.BuildMemberReferenceExpr(
      Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(),
      nullptr, MemberLookup, nullptr, nullptr).get());
}

MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow,
              LookupResult &MemberLookup)
    : Builder(Builder), Type(Type), IsArrow(IsArrow),
      MemberLookup(MemberLookup) {}
11498};

11500class MoveCastBuilder: public ExprBuilder {
const ExprBuilder &Builder;

11503public:
Expr *build(Sema &S, SourceLocation Loc) const override {
  return assertNotNull(CastForMoving(S, Builder.build(S, Loc)));
}

MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
11509};

11511class LvalueConvBuilder: public ExprBuilder {
const ExprBuilder &Builder;

11514public:
Expr *build(Sema &S, SourceLocation Loc) const override {
  return assertNotNull(
      S.DefaultLvalueConversion(Builder.build(S, Loc)).get());
}

LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
11521};

11523class SubscriptBuilder: public ExprBuilder {
const ExprBuilder &Base;
const ExprBuilder &Index;

11527public:
Expr *build(Sema &S, SourceLocation Loc) const override {
  return assertNotNull(S.CreateBuiltinArraySubscriptExpr(
      Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).get());
}

SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index)
    : Base(Base), Index(Index) {}
11535};

11537} // end anonymous namespace

11539/// When generating a defaulted copy or move assignment operator, if a field
11540/// should be copied with __builtin_memcpy rather than via explicit assignments,
11541/// do so. This optimization only applies for arrays of scalars, and for arrays
11542/// of class type where the selected copy/move-assignment operator is trivial.
11543static StmtResult
11544buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T,
                         const ExprBuilder &ToB, const ExprBuilder &FromB) {
// Compute the size of the memory buffer to be copied.
QualType SizeType = S.Context.getSizeType();
llvm::APInt Size(S.Context.getTypeSize(SizeType),
                 S.Context.getTypeSizeInChars(T).getQuantity());

// Take the address of the field references for "from" and "to". We
// directly construct UnaryOperators here because semantic analysis
// does not permit us to take the address of an xvalue.
Expr *From = FromB.build(S, Loc);
From = new (S.Context) UnaryOperator(From, UO_AddrOf,
                       S.Context.getPointerType(From->getType()),
                       VK_RValue, OK_Ordinary, Loc, false);
Expr *To = ToB.build(S, Loc);
To = new (S.Context) UnaryOperator(To, UO_AddrOf,
                     S.Context.getPointerType(To->getType()),
                     VK_RValue, OK_Ordinary, Loc, false);

const Type *E = T->getBaseElementTypeUnsafe();
bool NeedsCollectableMemCpy =
  E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember();

// Create a reference to the __builtin_objc_memmove_collectable function
StringRef MemCpyName = NeedsCollectableMemCpy ?
  "__builtin_objc_memmove_collectable" :
  "__builtin_memcpy";
LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc,
               Sema::LookupOrdinaryName);
S.LookupName(R, S.TUScope, true);

FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>();
if (!MemCpy)
  // Something went horribly wrong earlier, and we will have complained
  // about it.
  return StmtError();

ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy,
                                          VK_RValue, Loc, nullptr);
assert(MemCpyRef.isUsable() && "Builtin reference cannot fail")((MemCpyRef.isUsable() && "Builtin reference cannot fail"
) ? static_cast<void> (0) : __assert_fail ("MemCpyRef.isUsable() && \"Builtin reference cannot fail\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11583, __PRETTY_FUNCTION__));

Expr *CallArgs[] = {
  To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc)
};
ExprResult Call = S.BuildCallExpr(/*Scope=*/nullptr, MemCpyRef.get(),
                                  Loc, CallArgs, Loc);

assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!")((!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"
) ? static_cast<void> (0) : __assert_fail ("!Call.isInvalid() && \"Call to __builtin_memcpy cannot fail!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11591, __PRETTY_FUNCTION__));
return Call.getAs<Stmt>();
11593}

11595/// Builds a statement that copies/moves the given entity from \p From to
11596/// \c To.
11597///
11598/// This routine is used to copy/move the members of a class with an
11599/// implicitly-declared copy/move assignment operator. When the entities being
11600/// copied are arrays, this routine builds for loops to copy them.
11601///
11602/// \param S The Sema object used for type-checking.
11603///
11604/// \param Loc The location where the implicit copy/move is being generated.
11605///
11606/// \param T The type of the expressions being copied/moved. Both expressions
11607/// must have this type.
11608///
11609/// \param To The expression we are copying/moving to.
11610///
11611/// \param From The expression we are copying/moving from.
11612///
11613/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject.
11614/// Otherwise, it's a non-static member subobject.
11615///
11616/// \param Copying Whether we're copying or moving.
11617///
11618/// \param Depth Internal parameter recording the depth of the recursion.
11619///
11620/// \returns A statement or a loop that copies the expressions, or StmtResult(0)
11621/// if a memcpy should be used instead.
11622static StmtResult
11623buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T,
                               const ExprBuilder &To, const ExprBuilder &From,
                               bool CopyingBaseSubobject, bool Copying,
                               unsigned Depth = 0) {
// C++11 [class.copy]p28:
//   Each subobject is assigned in the manner appropriate to its type:
//
//     - if the subobject is of class type, as if by a call to operator= with
//       the subobject as the object expression and the corresponding
//       subobject of x as a single function argument (as if by explicit
//       qualification; that is, ignoring any possible virtual overriding
//       functions in more derived classes);
//
// C++03 [class.copy]p13:
//     - if the subobject is of class type, the copy assignment operator for
//       the class is used (as if by explicit qualification; that is,
//       ignoring any possible virtual overriding functions in more derived
//       classes);
if (const RecordType *RecordTy = T->getAs<RecordType>()) {
  CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl());

  // Look for operator=.
  DeclarationName Name
    = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal);
  LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName);
  S.LookupQualifiedName(OpLookup, ClassDecl, false);

  // Prior to C++11, filter out any result that isn't a copy/move-assignment
  // operator.
  if (!S.getLangOpts().CPlusPlus11) {
    LookupResult::Filter F = OpLookup.makeFilter();
    while (F.hasNext()) {
      NamedDecl *D = F.next();
      if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
        if (Method->isCopyAssignmentOperator() ||
            (!Copying && Method->isMoveAssignmentOperator()))
          continue;

      F.erase();
    }
    F.done();
  }

  // Suppress the protected check (C++ [class.protected]) for each of the
  // assignment operators we found. This strange dance is required when
  // we're assigning via a base classes's copy-assignment operator. To
  // ensure that we're getting the right base class subobject (without
  // ambiguities), we need to cast "this" to that subobject type; to
  // ensure that we don't go through the virtual call mechanism, we need
  // to qualify the operator= name with the base class (see below). However,
  // this means that if the base class has a protected copy assignment
  // operator, the protected member access check will fail. So, we
  // rewrite "protected" access to "public" access in this case, since we
  // know by construction that we're calling from a derived class.
  if (CopyingBaseSubobject) {
    for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end();
         L != LEnd; ++L) {
      if (L.getAccess() == AS_protected)
        L.setAccess(AS_public);
    }
  }

  // Create the nested-name-specifier that will be used to qualify the
  // reference to operator=; this is required to suppress the virtual
  // call mechanism.
  CXXScopeSpec SS;
  const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr());
  SS.MakeTrivial(S.Context,
                 NestedNameSpecifier::Create(S.Context, nullptr, false,
                                             CanonicalT),
                 Loc);

  // Create the reference to operator=.
  ExprResult OpEqualRef
    = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*isArrow=*/false,
                                 SS, /*TemplateKWLoc=*/SourceLocation(),
                                 /*FirstQualifierInScope=*/nullptr,
                                 OpLookup,
                                 /*TemplateArgs=*/nullptr, /*S*/nullptr,
                                 /*SuppressQualifierCheck=*/true);
  if (OpEqualRef.isInvalid())
    return StmtError();

  // Build the call to the assignment operator.

  Expr *FromInst = From.build(S, Loc);
  ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/nullptr,
                                                OpEqualRef.getAs<Expr>(),
                                                Loc, FromInst, Loc);
  if (Call.isInvalid())
    return StmtError();

  // If we built a call to a trivial 'operator=' while copying an array,
  // bail out. We'll replace the whole shebang with a memcpy.
  CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get());
  if (CE && CE->getMethodDecl()->isTrivial() && Depth)
    return StmtResult((Stmt*)nullptr);

  // Convert to an expression-statement, and clean up any produced
  // temporaries.
  return S.ActOnExprStmt(Call);
}

//     - if the subobject is of scalar type, the built-in assignment
//       operator is used.
const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T);
if (!ArrayTy) {
  ExprResult Assignment = S.CreateBuiltinBinOp(
      Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc));
  if (Assignment.isInvalid())
    return StmtError();
  return S.ActOnExprStmt(Assignment);
}

//     - if the subobject is an array, each element is assigned, in the
//       manner appropriate to the element type;

// Construct a loop over the array bounds, e.g.,
//
//   for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0)
//
// that will copy each of the array elements.
QualType SizeType = S.Context.getSizeType();

// Create the iteration variable.
IdentifierInfo *IterationVarName = nullptr;
{
  SmallString<8> Str;
  llvm::raw_svector_ostream OS(Str);
  OS << "__i" << Depth;
  IterationVarName = &S.Context.Idents.get(OS.str());
}
VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
                                        IterationVarName, SizeType,
                          S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
                                        SC_None);

// Initialize the iteration variable to zero.
llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));

// Creates a reference to the iteration variable.
RefBuilder IterationVarRef(IterationVar, SizeType);
LvalueConvBuilder IterationVarRefRVal(IterationVarRef);

// Create the DeclStmt that holds the iteration variable.
Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc);

// Subscript the "from" and "to" expressions with the iteration variable.
SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal);
MoveCastBuilder FromIndexMove(FromIndexCopy);
const ExprBuilder *FromIndex;
if (Copying)
  FromIndex = &FromIndexCopy;
else
  FromIndex = &FromIndexMove;

SubscriptBuilder ToIndex(To, IterationVarRefRVal);

// Build the copy/move for an individual element of the array.
StmtResult Copy =
  buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(),
                                   ToIndex, *FromIndex, CopyingBaseSubobject,
                                   Copying, Depth + 1);
// Bail out if copying fails or if we determined that we should use memcpy.
if (Copy.isInvalid() || !Copy.get())
  return Copy;

// Create the comparison against the array bound.
llvm::APInt Upper
  = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType));
Expr *Comparison
  = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc),
                   IntegerLiteral::Create(S.Context, Upper, SizeType, Loc),
                                   BO_NE, S.Context.BoolTy,
                                   VK_RValue, OK_Ordinary, Loc, FPOptions());

// Create the pre-increment of the iteration variable. We can determine
// whether the increment will overflow based on the value of the array
// bound.
Expr *Increment = new (S.Context)
    UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc, SizeType,
                  VK_LValue, OK_Ordinary, Loc, Upper.isMaxValue());

// Construct the loop that copies all elements of this array.
return S.ActOnForStmt(
    Loc, Loc, InitStmt,
    S.ActOnCondition(nullptr, Loc, Comparison, Sema::ConditionKind::Boolean),
    S.MakeFullDiscardedValueExpr(Increment), Loc, Copy.get());
11812}

11814static StmtResult
11815buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T,
                    const ExprBuilder &To, const ExprBuilder &From,
                    bool CopyingBaseSubobject, bool Copying) {
// Maybe we should use a memcpy?
if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() &&
    T.isTriviallyCopyableType(S.Context))
  return buildMemcpyForAssignmentOp(S, Loc, T, To, From);

StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From,
                                                   CopyingBaseSubobject,
                                                   Copying, 0));

// If we ended up picking a trivial assignment operator for an array of a
// non-trivially-copyable class type, just emit a memcpy.
if (!Result.isInvalid() && !Result.get())
  return buildMemcpyForAssignmentOp(S, Loc, T, To, From);

return Result;
11833}

11835CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) {
// Note: The following rules are largely analoguous to the copy
// constructor rules. Note that virtual bases are not taken into account
// for determining the argument type of the operator. Note also that
// operators taking an object instead of a reference are allowed.
assert(ClassDecl->needsImplicitCopyAssignment())((ClassDecl->needsImplicitCopyAssignment()) ? static_cast<
void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyAssignment()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11840, __PRETTY_FUNCTION__));

DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment);
if (DSM.isAlreadyBeingDeclared())
  return nullptr;

QualType ArgType = Context.getTypeDeclType(ClassDecl);
if (Context.getLangOpts().OpenCLCPlusPlus)
  ArgType = Context.getAddrSpaceQualType(ArgType, LangAS::opencl_generic);
QualType RetType = Context.getLValueReferenceType(ArgType);
bool Const = ClassDecl->implicitCopyAssignmentHasConstParam();
if (Const)
  ArgType = ArgType.withConst();

ArgType = Context.getLValueReferenceType(ArgType);

bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
                                                   CXXCopyAssignment,
                                                   Const);

//   An implicitly-declared copy assignment operator is an inline public
//   member of its class.
DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
SourceLocation ClassLoc = ClassDecl->getLocation();
DeclarationNameInfo NameInfo(Name, ClassLoc);
CXXMethodDecl *CopyAssignment =
    CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
                          /*TInfo=*/nullptr, /*StorageClass=*/SC_None,
                          /*isInline=*/true, Constexpr, SourceLocation());
CopyAssignment->setAccess(AS_public);
CopyAssignment->setDefaulted();
CopyAssignment->setImplicit();

if (getLangOpts().CUDA) {
  inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyAssignment,
                                          CopyAssignment,
                                          /* ConstRHS */ Const,
                                          /* Diagnose */ false);
}

setupImplicitSpecialMemberType(CopyAssignment, RetType, ArgType);

// Add the parameter to the operator.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
                                             ClassLoc, ClassLoc,
                                             /*Id=*/nullptr, ArgType,
                                             /*TInfo=*/nullptr, SC_None,
                                             nullptr);
CopyAssignment->setParams(FromParam);

CopyAssignment->setTrivial(
  ClassDecl->needsOverloadResolutionForCopyAssignment()
    ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment)
    : ClassDecl->hasTrivialCopyAssignment());

// Note that we have added this copy-assignment operator.
++getASTContext().NumImplicitCopyAssignmentOperatorsDeclared;

Scope *S = getScopeForContext(ClassDecl);
CheckImplicitSpecialMemberDeclaration(S, CopyAssignment);

if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment))
  SetDeclDeleted(CopyAssignment, ClassLoc);

if (S)
  PushOnScopeChains(CopyAssignment, S, false);
ClassDecl->addDecl(CopyAssignment);

return CopyAssignment;
11909}

11911/// Diagnose an implicit copy operation for a class which is odr-used, but
11912/// which is deprecated because the class has a user-declared copy constructor,
11913/// copy assignment operator, or destructor.
11914static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp) {
assert(CopyOp->isImplicit())((CopyOp->isImplicit()) ? static_cast<void> (0) : __assert_fail
 ("CopyOp->isImplicit()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11915, __PRETTY_FUNCTION__));

CXXRecordDecl *RD = CopyOp->getParent();
CXXMethodDecl *UserDeclaredOperation = nullptr;

// In Microsoft mode, assignment operations don't affect constructors and
// vice versa.
if (RD->hasUserDeclaredDestructor()) {
  UserDeclaredOperation = RD->getDestructor();
} else if (!isa<CXXConstructorDecl>(CopyOp) &&
           RD->hasUserDeclaredCopyConstructor() &&
           !S.getLangOpts().MSVCCompat) {
  // Find any user-declared copy constructor.
  for (auto *I : RD->ctors()) {
    if (I->isCopyConstructor()) {
      UserDeclaredOperation = I;
      break;
    }
  }
  assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail
 ("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11934, __PRETTY_FUNCTION__));
} else if (isa<CXXConstructorDecl>(CopyOp) &&
           RD->hasUserDeclaredCopyAssignment() &&
           !S.getLangOpts().MSVCCompat) {
  // Find any user-declared move assignment operator.
  for (auto *I : RD->methods()) {
    if (I->isCopyAssignmentOperator()) {
      UserDeclaredOperation = I;
      break;
    }
  }
  assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail
 ("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11945, __PRETTY_FUNCTION__));
}

if (UserDeclaredOperation) {
  S.Diag(UserDeclaredOperation->getLocation(),
       diag::warn_deprecated_copy_operation)
    << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp)
    << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation);
}
11954}

11956void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
                                      CXXMethodDecl *CopyAssignOperator) {
assert((CopyAssignOperator->isDefaulted() &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11963, __PRETTY_FUNCTION__))
        CopyAssignOperator->isOverloadedOperator() &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11963, __PRETTY_FUNCTION__))
        CopyAssignOperator->getOverloadedOperator() == OO_Equal &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11963, __PRETTY_FUNCTION__))
        !CopyAssignOperator->doesThisDeclarationHaveABody() &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11963, __PRETTY_FUNCTION__))
        !CopyAssignOperator->isDeleted()) &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11963, __PRETTY_FUNCTION__))
       "DefineImplicitCopyAssignment called for wrong function")(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 11963, __PRETTY_FUNCTION__));
if (CopyAssignOperator->willHaveBody() || CopyAssignOperator->isInvalidDecl())
  return;

CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent();
if (ClassDecl->isInvalidDecl()) {
  CopyAssignOperator->setInvalidDecl();
  return;
}

SynthesizedFunctionScope Scope(*this, CopyAssignOperator);

// The exception specification is needed because we are defining the
// function.
ResolveExceptionSpec(CurrentLocation,
                     CopyAssignOperator->getType()->castAs<FunctionProtoType>());

// Add a context note for diagnostics produced after this point.
Scope.addContextNote(CurrentLocation);

// C++11 [class.copy]p18:
//   The [definition of an implicitly declared copy assignment operator] is
//   deprecated if the class has a user-declared copy constructor or a
//   user-declared destructor.
if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit())
  diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator);

// C++0x [class.copy]p30:
//   The implicitly-defined or explicitly-defaulted copy assignment operator
//   for a non-union class X performs memberwise copy assignment of its
//   subobjects. The direct base classes of X are assigned first, in the
//   order of their declaration in the base-specifier-list, and then the
//   immediate non-static data members of X are assigned, in the order in
//   which they were declared in the class definition.

// The statements that form the synthesized function body.
SmallVector<Stmt*, 8> Statements;

// The parameter for the "other" object, which we are copying from.
ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0);
Qualifiers OtherQuals = Other->getType().getQualifiers();
QualType OtherRefType = Other->getType();
if (const LValueReferenceType *OtherRef
                              = OtherRefType->getAs<LValueReferenceType>()) {
  OtherRefType = OtherRef->getPointeeType();
  OtherQuals = OtherRefType.getQualifiers();
}

// Our location for everything implicitly-generated.
SourceLocation Loc = CopyAssignOperator->getEndLoc().isValid()
                         ? CopyAssignOperator->getEndLoc()
                         : CopyAssignOperator->getLocation();

// Builds a DeclRefExpr for the "other" object.
RefBuilder OtherRef(Other, OtherRefType);

// Builds the "this" pointer.
ThisBuilder This;

// Assign base classes.
bool Invalid = false;
for (auto &Base : ClassDecl->bases()) {
  // Form the assignment:
  //   static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other));
  QualType BaseType = Base.getType().getUnqualifiedType();
  if (!BaseType->isRecordType()) {
    Invalid = true;
    continue;
  }

  CXXCastPath BasePath;
  BasePath.push_back(&Base);

  // Construct the "from" expression, which is an implicit cast to the
  // appropriately-qualified base type.
  CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals),
                   VK_LValue, BasePath);

  // Dereference "this".
  DerefBuilder DerefThis(This);
  CastBuilder To(DerefThis,
                 Context.getQualifiedType(
                     BaseType, CopyAssignOperator->getMethodQualifiers()),
                 VK_LValue, BasePath);

  // Build the copy.
  StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType,
                                          To, From,
                                          /*CopyingBaseSubobject=*/true,
                                          /*Copying=*/true);
  if (Copy.isInvalid()) {
    CopyAssignOperator->setInvalidDecl();
    return;
  }

  // Success! Record the copy.
  Statements.push_back(Copy.getAs<Expr>());
}

// Assign non-static members.
for (auto *Field : ClassDecl->fields()) {
  // FIXME: We should form some kind of AST representation for the implied
  // memcpy in a union copy operation.
  if (Field->isUnnamedBitfield() || Field->getParent()->isUnion())
    continue;

  if (Field->isInvalidDecl()) {
    Invalid = true;
    continue;
  }

  // Check for members of reference type; we can't copy those.
  if (Field->getType()->isReferenceType()) {
    Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
      << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
    Diag(Field->getLocation(), diag::note_declared_at);
    Invalid = true;
    continue;
  }

  // Check for members of const-qualified, non-class type.
  QualType BaseType = Context.getBaseElementType(Field->getType());
  if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
    Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
      << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
    Diag(Field->getLocation(), diag::note_declared_at);
    Invalid = true;
    continue;
  }

  // Suppress assigning zero-width bitfields.
  if (Field->isZeroLengthBitField(Context))
    continue;

  QualType FieldType = Field->getType().getNonReferenceType();
  if (FieldType->isIncompleteArrayType()) {
    assert(ClassDecl->hasFlexibleArrayMember() &&((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12100, __PRETTY_FUNCTION__))
           "Incomplete array type is not valid")((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12100, __PRETTY_FUNCTION__));
    continue;
  }

  // Build references to the field in the object we're copying from and to.
  CXXScopeSpec SS; // Intentionally empty
  LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
                            LookupMemberName);
  MemberLookup.addDecl(Field);
  MemberLookup.resolveKind();

  MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup);

  MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup);

  // Build the copy of this field.
  StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType,
                                          To, From,
                                          /*CopyingBaseSubobject=*/false,
                                          /*Copying=*/true);
  if (Copy.isInvalid()) {
    CopyAssignOperator->setInvalidDecl();
    return;
  }

  // Success! Record the copy.
  Statements.push_back(Copy.getAs<Stmt>());
}

if (!Invalid) {
  // Add a "return *this;"
  ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));

  StmtResult Return = BuildReturnStmt(Loc, ThisObj.get());
  if (Return.isInvalid())
    Invalid = true;
  else
    Statements.push_back(Return.getAs<Stmt>());
}

if (Invalid) {
  CopyAssignOperator->setInvalidDecl();
  return;
}

StmtResult Body;
{
  CompoundScopeRAII CompoundScope(*this);
  Body = ActOnCompoundStmt(Loc, Loc, Statements,
                           /*isStmtExpr=*/false);
  assert(!Body.isInvalid() && "Compound statement creation cannot fail")((!Body.isInvalid() && "Compound statement creation cannot fail"
) ? static_cast<void> (0) : __assert_fail ("!Body.isInvalid() && \"Compound statement creation cannot fail\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12150, __PRETTY_FUNCTION__));
}
CopyAssignOperator->setBody(Body.getAs<Stmt>());
CopyAssignOperator->markUsed(Context);

if (ASTMutationListener *L = getASTMutationListener()) {
  L->CompletedImplicitDefinition(CopyAssignOperator);
}
12158}

12160CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) {
assert(ClassDecl->needsImplicitMoveAssignment())((ClassDecl->needsImplicitMoveAssignment()) ? static_cast<
void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveAssignment()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12161, __PRETTY_FUNCTION__));

DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment);
if (DSM.isAlreadyBeingDeclared())
  return nullptr;

// Note: The following rules are largely analoguous to the move
// constructor rules.

QualType ArgType = Context.getTypeDeclType(ClassDecl);
if (Context.getLangOpts().OpenCLCPlusPlus)
  ArgType = Context.getAddrSpaceQualType(ArgType, LangAS::opencl_generic);
QualType RetType = Context.getLValueReferenceType(ArgType);
ArgType = Context.getRValueReferenceType(ArgType);

bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
                                                   CXXMoveAssignment,
                                                   false);

//   An implicitly-declared move assignment operator is an inline public
//   member of its class.
DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
SourceLocation ClassLoc = ClassDecl->getLocation();
DeclarationNameInfo NameInfo(Name, ClassLoc);
CXXMethodDecl *MoveAssignment =
    CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
                          /*TInfo=*/nullptr, /*StorageClass=*/SC_None,
                          /*isInline=*/true, Constexpr, SourceLocation());
MoveAssignment->setAccess(AS_public);
MoveAssignment->setDefaulted();
MoveAssignment->setImplicit();

if (getLangOpts().CUDA) {
  inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveAssignment,
                                          MoveAssignment,
                                          /* ConstRHS */ false,
                                          /* Diagnose */ false);
}

// Build an exception specification pointing back at this member.
FunctionProtoType::ExtProtoInfo EPI =
    getImplicitMethodEPI(*this, MoveAssignment);
MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI));

// Add the parameter to the operator.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment,
                                             ClassLoc, ClassLoc,
                                             /*Id=*/nullptr, ArgType,
                                             /*TInfo=*/nullptr, SC_None,
                                             nullptr);
MoveAssignment->setParams(FromParam);

MoveAssignment->setTrivial(
  ClassDecl->needsOverloadResolutionForMoveAssignment()
    ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment)
    : ClassDecl->hasTrivialMoveAssignment());

// Note that we have added this copy-assignment operator.
++getASTContext().NumImplicitMoveAssignmentOperatorsDeclared;

Scope *S = getScopeForContext(ClassDecl);
CheckImplicitSpecialMemberDeclaration(S, MoveAssignment);

if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) {
  ClassDecl->setImplicitMoveAssignmentIsDeleted();
  SetDeclDeleted(MoveAssignment, ClassLoc);
}

if (S)
  PushOnScopeChains(MoveAssignment, S, false);
ClassDecl->addDecl(MoveAssignment);

return MoveAssignment;
12234}

12236/// Check if we're implicitly defining a move assignment operator for a class
12237/// with virtual bases. Such a move assignment might move-assign the virtual
12238/// base multiple times.
12239static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class,
                                             SourceLocation CurrentLocation) {
assert(!Class->isDependentContext() && "should not define dependent move")((!Class->isDependentContext() && "should not define dependent move"
) ? static_cast<void> (0) : __assert_fail ("!Class->isDependentContext() && \"should not define dependent move\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12241, __PRETTY_FUNCTION__));

// Only a virtual base could get implicitly move-assigned multiple times.
// Only a non-trivial move assignment can observe this. We only want to
// diagnose if we implicitly define an assignment operator that assigns
// two base classes, both of which move-assign the same virtual base.
if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() ||
    Class->getNumBases() < 2)
  return;

llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist;
typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap;
VBaseMap VBases;

for (auto &BI : Class->bases()) {
  Worklist.push_back(&BI);
  while (!Worklist.empty()) {
    CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val();
    CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl();

    // If the base has no non-trivial move assignment operators,
    // we don't care about moves from it.
    if (!Base->hasNonTrivialMoveAssignment())
      continue;

    // If there's nothing virtual here, skip it.
    if (!BaseSpec->isVirtual() && !Base->getNumVBases())
      continue;

    // If we're not actually going to call a move assignment for this base,
    // or the selected move assignment is trivial, skip it.
    Sema::SpecialMemberOverloadResult SMOR =
      S.LookupSpecialMember(Base, Sema::CXXMoveAssignment,
                            /*ConstArg*/false, /*VolatileArg*/false,
                            /*RValueThis*/true, /*ConstThis*/false,
                            /*VolatileThis*/false);
    if (!SMOR.getMethod() || SMOR.getMethod()->isTrivial() ||
        !SMOR.getMethod()->isMoveAssignmentOperator())
      continue;

    if (BaseSpec->isVirtual()) {
      // We're going to move-assign this virtual base, and its move
      // assignment operator is not trivial. If this can happen for
      // multiple distinct direct bases of Class, diagnose it. (If it
      // only happens in one base, we'll diagnose it when synthesizing
      // that base class's move assignment operator.)
      CXXBaseSpecifier *&Existing =
          VBases.insert(std::make_pair(Base->getCanonicalDecl(), &BI))
              .first->second;
      if (Existing && Existing != &BI) {
        S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times)
          << Class << Base;
        S.Diag(Existing->getBeginLoc(), diag::note_vbase_moved_here)
            << (Base->getCanonicalDecl() ==
                Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl())
            << Base << Existing->getType() << Existing->getSourceRange();
        S.Diag(BI.getBeginLoc(), diag::note_vbase_moved_here)
            << (Base->getCanonicalDecl() ==
                BI.getType()->getAsCXXRecordDecl()->getCanonicalDecl())
            << Base << BI.getType() << BaseSpec->getSourceRange();

        // Only diagnose each vbase once.
        Existing = nullptr;
      }
    } else {
      // Only walk over bases that have defaulted move assignment operators.
      // We assume that any user-provided move assignment operator handles
      // the multiple-moves-of-vbase case itself somehow.
      if (!SMOR.getMethod()->isDefaulted())
        continue;

      // We're going to move the base classes of Base. Add them to the list.
      for (auto &BI : Base->bases())
        Worklist.push_back(&BI);
    }
  }
}
12318}

12320void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
                                      CXXMethodDecl *MoveAssignOperator) {
assert((MoveAssignOperator->isDefaulted() &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12327, __PRETTY_FUNCTION__))
        MoveAssignOperator->isOverloadedOperator() &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12327, __PRETTY_FUNCTION__))
        MoveAssignOperator->getOverloadedOperator() == OO_Equal &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12327, __PRETTY_FUNCTION__))
        !MoveAssignOperator->doesThisDeclarationHaveABody() &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12327, __PRETTY_FUNCTION__))
        !MoveAssignOperator->isDeleted()) &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12327, __PRETTY_FUNCTION__))
       "DefineImplicitMoveAssignment called for wrong function")(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12327, __PRETTY_FUNCTION__));
if (MoveAssignOperator->willHaveBody() || MoveAssignOperator->isInvalidDecl())
  return;

CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent();
if (ClassDecl->isInvalidDecl()) {
  MoveAssignOperator->setInvalidDecl();
  return;
}

// C++0x [class.copy]p28:
//   The implicitly-defined or move assignment operator for a non-union class
//   X performs memberwise move assignment of its subobjects. The direct base
//   classes of X are assigned first, in the order of their declaration in the
//   base-specifier-list, and then the immediate non-static data members of X
//   are assigned, in the order in which they were declared in the class
//   definition.

// Issue a warning if our implicit move assignment operator will move
// from a virtual base more than once.
checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation);

SynthesizedFunctionScope Scope(*this, MoveAssignOperator);

// The exception specification is needed because we are defining the
// function.
ResolveExceptionSpec(CurrentLocation,
                     MoveAssignOperator->getType()->castAs<FunctionProtoType>());

// Add a context note for diagnostics produced after this point.
Scope.addContextNote(CurrentLocation);

// The statements that form the synthesized function body.
SmallVector<Stmt*, 8> Statements;

// The parameter for the "other" object, which we are move from.
ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0);
QualType OtherRefType = Other->getType()->
    getAs<RValueReferenceType>()->getPointeeType();

// Our location for everything implicitly-generated.
SourceLocation Loc = MoveAssignOperator->getEndLoc().isValid()
                         ? MoveAssignOperator->getEndLoc()
                         : MoveAssignOperator->getLocation();

// Builds a reference to the "other" object.
RefBuilder OtherRef(Other, OtherRefType);
// Cast to rvalue.
MoveCastBuilder MoveOther(OtherRef);

// Builds the "this" pointer.
ThisBuilder This;

// Assign base classes.
bool Invalid = false;
for (auto &Base : ClassDecl->bases()) {
  // C++11 [class.copy]p28:
  //   It is unspecified whether subobjects representing virtual base classes
  //   are assigned more than once by the implicitly-defined copy assignment
  //   operator.
  // FIXME: Do not assign to a vbase that will be assigned by some other base
  // class. For a move-assignment, this can result in the vbase being moved
  // multiple times.

  // Form the assignment:
  //   static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other));
  QualType BaseType = Base.getType().getUnqualifiedType();
  if (!BaseType->isRecordType()) {
    Invalid = true;
    continue;
  }

  CXXCastPath BasePath;
  BasePath.push_back(&Base);

  // Construct the "from" expression, which is an implicit cast to the
  // appropriately-qualified base type.
  CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath);

  // Dereference "this".
  DerefBuilder DerefThis(This);

  // Implicitly cast "this" to the appropriately-qualified base type.
  CastBuilder To(DerefThis,
                 Context.getQualifiedType(
                     BaseType, MoveAssignOperator->getMethodQualifiers()),
                 VK_LValue, BasePath);

  // Build the move.
  StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType,
                                          To, From,
                                          /*CopyingBaseSubobject=*/true,
                                          /*Copying=*/false);
  if (Move.isInvalid()) {
    MoveAssignOperator->setInvalidDecl();
    return;
  }

  // Success! Record the move.
  Statements.push_back(Move.getAs<Expr>());
}

// Assign non-static members.
for (auto *Field : ClassDecl->fields()) {
  // FIXME: We should form some kind of AST representation for the implied
  // memcpy in a union copy operation.
  if (Field->isUnnamedBitfield() || Field->getParent()->isUnion())
    continue;

  if (Field->isInvalidDecl()) {
    Invalid = true;
    continue;
  }

  // Check for members of reference type; we can't move those.
  if (Field->getType()->isReferenceType()) {
    Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
      << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
    Diag(Field->getLocation(), diag::note_declared_at);
    Invalid = true;
    continue;
  }

  // Check for members of const-qualified, non-class type.
  QualType BaseType = Context.getBaseElementType(Field->getType());
  if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
    Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
      << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
    Diag(Field->getLocation(), diag::note_declared_at);
    Invalid = true;
    continue;
  }

  // Suppress assigning zero-width bitfields.
  if (Field->isZeroLengthBitField(Context))
    continue;

  QualType FieldType = Field->getType().getNonReferenceType();
  if (FieldType->isIncompleteArrayType()) {
    assert(ClassDecl->hasFlexibleArrayMember() &&((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12467, __PRETTY_FUNCTION__))
           "Incomplete array type is not valid")((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12467, __PRETTY_FUNCTION__));
    continue;
  }

  // Build references to the field in the object we're copying from and to.
  LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
                            LookupMemberName);
  MemberLookup.addDecl(Field);
  MemberLookup.resolveKind();
  MemberBuilder From(MoveOther, OtherRefType,
                     /*IsArrow=*/false, MemberLookup);
  MemberBuilder To(This, getCurrentThisType(),
                   /*IsArrow=*/true, MemberLookup);

  assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue((!From.build(*this, Loc)->isLValue() && "Member reference with rvalue base must be rvalue except for reference "
 "members, which aren't allowed for move assignment.") ? static_cast
<void> (0) : __assert_fail ("!From.build(*this, Loc)->isLValue() && \"Member reference with rvalue base must be rvalue except for reference \" \"members, which aren't allowed for move assignment.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12483, __PRETTY_FUNCTION__))
      "Member reference with rvalue base must be rvalue except for reference "((!From.build(*this, Loc)->isLValue() && "Member reference with rvalue base must be rvalue except for reference "
 "members, which aren't allowed for move assignment.") ? static_cast
<void> (0) : __assert_fail ("!From.build(*this, Loc)->isLValue() && \"Member reference with rvalue base must be rvalue except for reference \" \"members, which aren't allowed for move assignment.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12483, __PRETTY_FUNCTION__))
      "members, which aren't allowed for move assignment.")((!From.build(*this, Loc)->isLValue() && "Member reference with rvalue base must be rvalue except for reference "
 "members, which aren't allowed for move assignment.") ? static_cast
<void> (0) : __assert_fail ("!From.build(*this, Loc)->isLValue() && \"Member reference with rvalue base must be rvalue except for reference \" \"members, which aren't allowed for move assignment.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12483, __PRETTY_FUNCTION__));

  // Build the move of this field.
  StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType,
                                          To, From,
                                          /*CopyingBaseSubobject=*/false,
                                          /*Copying=*/false);
  if (Move.isInvalid()) {
    MoveAssignOperator->setInvalidDecl();
    return;
  }

  // Success! Record the copy.
  Statements.push_back(Move.getAs<Stmt>());
}

if (!Invalid) {
  // Add a "return *this;"
  ExprResult ThisObj =
      CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));

  StmtResult Return = BuildReturnStmt(Loc, ThisObj.get());
  if (Return.isInvalid())
    Invalid = true;
  else
    Statements.push_back(Return.getAs<Stmt>());
}

if (Invalid) {
  MoveAssignOperator->setInvalidDecl();
  return;
}

StmtResult Body;
{
  CompoundScopeRAII CompoundScope(*this);
  Body = ActOnCompoundStmt(Loc, Loc, Statements,
                           /*isStmtExpr=*/false);
  assert(!Body.isInvalid() && "Compound statement creation cannot fail")((!Body.isInvalid() && "Compound statement creation cannot fail"
) ? static_cast<void> (0) : __assert_fail ("!Body.isInvalid() && \"Compound statement creation cannot fail\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12521, __PRETTY_FUNCTION__));
}
MoveAssignOperator->setBody(Body.getAs<Stmt>());
MoveAssignOperator->markUsed(Context);

if (ASTMutationListener *L = getASTMutationListener()) {
  L->CompletedImplicitDefinition(MoveAssignOperator);
}
12529}

12531CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(
                                                  CXXRecordDecl *ClassDecl) {
// C++ [class.copy]p4:
//   If the class definition does not explicitly declare a copy
//   constructor, one is declared implicitly.
assert(ClassDecl->needsImplicitCopyConstructor())((ClassDecl->needsImplicitCopyConstructor()) ? static_cast
<void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyConstructor()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12536, __PRETTY_FUNCTION__));

DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor);
if (DSM.isAlreadyBeingDeclared())
  return nullptr;

QualType ClassType = Context.getTypeDeclType(ClassDecl);
QualType ArgType = ClassType;
bool Const = ClassDecl->implicitCopyConstructorHasConstParam();
if (Const)
  ArgType = ArgType.withConst();

if (Context.getLangOpts().OpenCLCPlusPlus)
  ArgType = Context.getAddrSpaceQualType(ArgType, LangAS::opencl_generic);

ArgType = Context.getLValueReferenceType(ArgType);

bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
                                                   CXXCopyConstructor,
                                                   Const);

DeclarationName Name
  = Context.DeclarationNames.getCXXConstructorName(
                                         Context.getCanonicalType(ClassType));
SourceLocation ClassLoc = ClassDecl->getLocation();
DeclarationNameInfo NameInfo(Name, ClassLoc);

//   An implicitly-declared copy constructor is an inline public
//   member of its class.
CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create(
    Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr,
    ExplicitSpecifier(),
    /*isInline=*/true,
    /*isImplicitlyDeclared=*/true, Constexpr);
CopyConstructor->setAccess(AS_public);
CopyConstructor->setDefaulted();

if (getLangOpts().CUDA) {
  inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyConstructor,
                                          CopyConstructor,
                                          /* ConstRHS */ Const,
                                          /* Diagnose */ false);
}

setupImplicitSpecialMemberType(CopyConstructor, Context.VoidTy, ArgType);

// Add the parameter to the constructor.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
                                             ClassLoc, ClassLoc,
                                             /*IdentifierInfo=*/nullptr,
                                             ArgType, /*TInfo=*/nullptr,
                                             SC_None, nullptr);
CopyConstructor->setParams(FromParam);

CopyConstructor->setTrivial(
    ClassDecl->needsOverloadResolutionForCopyConstructor()
        ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor)
        : ClassDecl->hasTrivialCopyConstructor());

CopyConstructor->setTrivialForCall(
    ClassDecl->hasAttr<TrivialABIAttr>() ||
    (ClassDecl->needsOverloadResolutionForCopyConstructor()
         ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor,
           TAH_ConsiderTrivialABI)
         : ClassDecl->hasTrivialCopyConstructorForCall()));

// Note that we have declared this constructor.
++getASTContext().NumImplicitCopyConstructorsDeclared;

Scope *S = getScopeForContext(ClassDecl);
CheckImplicitSpecialMemberDeclaration(S, CopyConstructor);

if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) {
  ClassDecl->setImplicitCopyConstructorIsDeleted();
  SetDeclDeleted(CopyConstructor, ClassLoc);
}

if (S)
  PushOnScopeChains(CopyConstructor, S, false);
ClassDecl->addDecl(CopyConstructor);

return CopyConstructor;
12618}

12620void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
                                       CXXConstructorDecl *CopyConstructor) {
assert((CopyConstructor->isDefaulted() &&(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12626, __PRETTY_FUNCTION__))
        CopyConstructor->isCopyConstructor() &&(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12626, __PRETTY_FUNCTION__))
        !CopyConstructor->doesThisDeclarationHaveABody() &&(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12626, __PRETTY_FUNCTION__))
        !CopyConstructor->isDeleted()) &&(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12626, __PRETTY_FUNCTION__))
       "DefineImplicitCopyConstructor - call it for implicit copy ctor")(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12626, __PRETTY_FUNCTION__));
if (CopyConstructor->willHaveBody() || CopyConstructor->isInvalidDecl())
  return;

CXXRecordDecl *ClassDecl = CopyConstructor->getParent();
assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor")((ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitCopyConstructor - invalid constructor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12631, __PRETTY_FUNCTION__));

SynthesizedFunctionScope Scope(*this, CopyConstructor);

// The exception specification is needed because we are defining the
// function.
ResolveExceptionSpec(CurrentLocation,
                     CopyConstructor->getType()->castAs<FunctionProtoType>());
MarkVTableUsed(CurrentLocation, ClassDecl);

// Add a context note for diagnostics produced after this point.
Scope.addContextNote(CurrentLocation);

// C++11 [class.copy]p7:
//   The [definition of an implicitly declared copy constructor] is
//   deprecated if the class has a user-declared copy assignment operator
//   or a user-declared destructor.
if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit())
  diagnoseDeprecatedCopyOperation(*this, CopyConstructor);

if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false)) {
  CopyConstructor->setInvalidDecl();
}  else {
  SourceLocation Loc = CopyConstructor->getEndLoc().isValid()
                           ? CopyConstructor->getEndLoc()
                           : CopyConstructor->getLocation();
  Sema::CompoundScopeRAII CompoundScope(*this);
  CopyConstructor->setBody(
      ActOnCompoundStmt(Loc, Loc, None, /*isStmtExpr=*/false).getAs<Stmt>());
  CopyConstructor->markUsed(Context);
}

if (ASTMutationListener *L = getASTMutationListener()) {
  L->CompletedImplicitDefinition(CopyConstructor);
}
12666}

12668CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor(
                                                  CXXRecordDecl *ClassDecl) {
assert(ClassDecl->needsImplicitMoveConstructor())((ClassDecl->needsImplicitMoveConstructor()) ? static_cast
<void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveConstructor()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12670, __PRETTY_FUNCTION__));

DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor);
if (DSM.isAlreadyBeingDeclared())
  return nullptr;

QualType ClassType = Context.getTypeDeclType(ClassDecl);

QualType ArgType = ClassType;
if (Context.getLangOpts().OpenCLCPlusPlus)
  ArgType = Context.getAddrSpaceQualType(ClassType, LangAS::opencl_generic);
ArgType = Context.getRValueReferenceType(ArgType);

bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
                                                   CXXMoveConstructor,
                                                   false);

DeclarationName Name
  = Context.DeclarationNames.getCXXConstructorName(
                                         Context.getCanonicalType(ClassType));
SourceLocation ClassLoc = ClassDecl->getLocation();
DeclarationNameInfo NameInfo(Name, ClassLoc);

// C++11 [class.copy]p11:
//   An implicitly-declared copy/move constructor is an inline public
//   member of its class.
CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create(
    Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr,
    ExplicitSpecifier(),
    /*isInline=*/true,
    /*isImplicitlyDeclared=*/true, Constexpr);
MoveConstructor->setAccess(AS_public);
MoveConstructor->setDefaulted();

if (getLangOpts().CUDA) {
  inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveConstructor,
                                          MoveConstructor,
                                          /* ConstRHS */ false,
                                          /* Diagnose */ false);
}

setupImplicitSpecialMemberType(MoveConstructor, Context.VoidTy, ArgType);

// Add the parameter to the constructor.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor,
                                             ClassLoc, ClassLoc,
                                             /*IdentifierInfo=*/nullptr,
                                             ArgType, /*TInfo=*/nullptr,
                                             SC_None, nullptr);
MoveConstructor->setParams(FromParam);

MoveConstructor->setTrivial(
    ClassDecl->needsOverloadResolutionForMoveConstructor()
        ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor)
        : ClassDecl->hasTrivialMoveConstructor());

MoveConstructor->setTrivialForCall(
    ClassDecl->hasAttr<TrivialABIAttr>() ||
    (ClassDecl->needsOverloadResolutionForMoveConstructor()
         ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor,
                                  TAH_ConsiderTrivialABI)
         : ClassDecl->hasTrivialMoveConstructorForCall()));

// Note that we have declared this constructor.
++getASTContext().NumImplicitMoveConstructorsDeclared;

Scope *S = getScopeForContext(ClassDecl);
CheckImplicitSpecialMemberDeclaration(S, MoveConstructor);

if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) {
  ClassDecl->setImplicitMoveConstructorIsDeleted();
  SetDeclDeleted(MoveConstructor, ClassLoc);
}

if (S)
  PushOnScopeChains(MoveConstructor, S, false);
ClassDecl->addDecl(MoveConstructor);

return MoveConstructor;
12749}

12751void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
                                       CXXConstructorDecl *MoveConstructor) {
assert((MoveConstructor->isDefaulted() &&(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12757, __PRETTY_FUNCTION__))
        MoveConstructor->isMoveConstructor() &&(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12757, __PRETTY_FUNCTION__))
        !MoveConstructor->doesThisDeclarationHaveABody() &&(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12757, __PRETTY_FUNCTION__))
        !MoveConstructor->isDeleted()) &&(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12757, __PRETTY_FUNCTION__))
       "DefineImplicitMoveConstructor - call it for implicit move ctor")(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12757, __PRETTY_FUNCTION__));
if (MoveConstructor->willHaveBody() || MoveConstructor->isInvalidDecl())
  return;

CXXRecordDecl *ClassDecl = MoveConstructor->getParent();
assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor")((ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitMoveConstructor - invalid constructor\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12762, __PRETTY_FUNCTION__));

SynthesizedFunctionScope Scope(*this, MoveConstructor);

// The exception specification is needed because we are defining the
// function.
ResolveExceptionSpec(CurrentLocation,
                     MoveConstructor->getType()->castAs<FunctionProtoType>());
MarkVTableUsed(CurrentLocation, ClassDecl);

// Add a context note for diagnostics produced after this point.
Scope.addContextNote(CurrentLocation);

if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false)) {
  MoveConstructor->setInvalidDecl();
} else {
  SourceLocation Loc = MoveConstructor->getEndLoc().isValid()
                           ? MoveConstructor->getEndLoc()
                           : MoveConstructor->getLocation();
  Sema::CompoundScopeRAII CompoundScope(*this);
  MoveConstructor->setBody(ActOnCompoundStmt(
      Loc, Loc, None, /*isStmtExpr=*/ false).getAs<Stmt>());
  MoveConstructor->markUsed(Context);
}

if (ASTMutationListener *L = getASTMutationListener()) {
  L->CompletedImplicitDefinition(MoveConstructor);
}
12790}

12792bool Sema::isImplicitlyDeleted(FunctionDecl *FD) {
return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD);
12794}

12796void Sema::DefineImplicitLambdaToFunctionPointerConversion(
                          SourceLocation CurrentLocation,
                          CXXConversionDecl *Conv) {
SynthesizedFunctionScope Scope(*this, Conv);
assert(!Conv->getReturnType()->isUndeducedType())((!Conv->getReturnType()->isUndeducedType()) ? static_cast
<void> (0) : __assert_fail ("!Conv->getReturnType()->isUndeducedType()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12800, __PRETTY_FUNCTION__));

CXXRecordDecl *Lambda = Conv->getParent();
FunctionDecl *CallOp = Lambda->getLambdaCallOperator();
FunctionDecl *Invoker = Lambda->getLambdaStaticInvoker();

if (auto *TemplateArgs = Conv->getTemplateSpecializationArgs()) {
  CallOp = InstantiateFunctionDeclaration(
      CallOp->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation);
  if (!CallOp)
    return;

  Invoker = InstantiateFunctionDeclaration(
      Invoker->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation);
  if (!Invoker)
    return;
}

if (CallOp->isInvalidDecl())
  return;

// Mark the call operator referenced (and add to pending instantiations
// if necessary).
// For both the conversion and static-invoker template specializations
// we construct their body's in this function, so no need to add them
// to the PendingInstantiations.
MarkFunctionReferenced(CurrentLocation, CallOp);

// Fill in the __invoke function with a dummy implementation. IR generation
// will fill in the actual details. Update its type in case it contained
// an 'auto'.
Invoker->markUsed(Context);
Invoker->setReferenced();
Invoker->setType(Conv->getReturnType()->getPointeeType());
Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation()));

// Construct the body of the conversion function { return __invoke; }.
Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(),
                                     VK_LValue, Conv->getLocation()).get();
assert(FunctionRef && "Can't refer to __invoke function?")((FunctionRef && "Can't refer to __invoke function?")
 ? static_cast<void> (0) : __assert_fail ("FunctionRef && \"Can't refer to __invoke function?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12839, __PRETTY_FUNCTION__));
Stmt *Return = BuildReturnStmt(Conv->getLocation(), FunctionRef).get();
Conv->setBody(CompoundStmt::Create(Context, Return, Conv->getLocation(),
                                   Conv->getLocation()));
Conv->markUsed(Context);
Conv->setReferenced();

if (ASTMutationListener *L = getASTMutationListener()) {
  L->CompletedImplicitDefinition(Conv);
  L->CompletedImplicitDefinition(Invoker);
}
12850}



12854void Sema::DefineImplicitLambdaToBlockPointerConversion(
     SourceLocation CurrentLocation,
     CXXConversionDecl *Conv)
12857{
assert(!Conv->getParent()->isGenericLambda())((!Conv->getParent()->isGenericLambda()) ? static_cast<
void> (0) : __assert_fail ("!Conv->getParent()->isGenericLambda()"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 12858, __PRETTY_FUNCTION__));

SynthesizedFunctionScope Scope(*this, Conv);

// Copy-initialize the lambda object as needed to capture it.
Expr *This = ActOnCXXThis(CurrentLocation).get();
Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).get();

ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation,
                                                      Conv->getLocation(),
                                                      Conv, DerefThis);

// If we're not under ARC, make sure we still get the _Block_copy/autorelease
// behavior.  Note that only the general conversion function does this
// (since it's unusable otherwise); in the case where we inline the
// block literal, it has block literal lifetime semantics.
if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount)
  BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(),
                                        CK_CopyAndAutoreleaseBlockObject,
                                        BuildBlock.get(), nullptr, VK_RValue);

if (BuildBlock.isInvalid()) {
  Diag(CurrentLocation, diag::note_lambda_to_block_conv);
  Conv->setInvalidDecl();
  return;
}

// Create the return statement that returns the block from the conversion
// function.
StmtResult Return = BuildReturnStmt(Conv->getLocation(), BuildBlock.get());
if (Return.isInvalid()) {
  Diag(CurrentLocation, diag::note_lambda_to_block_conv);
  Conv->setInvalidDecl();
  return;
}

// Set the body of the conversion function.
Stmt *ReturnS = Return.get();
Conv->setBody(CompoundStmt::Create(Context, ReturnS, Conv->getLocation(),
                                   Conv->getLocation()));
Conv->markUsed(Context);

// We're done; notify the mutation listener, if any.
if (ASTMutationListener *L = getASTMutationListener()) {
  L->CompletedImplicitDefinition(Conv);
}
12904}

12906/// Determine whether the given list arguments contains exactly one
12907/// "real" (non-default) argument.
12908static bool hasOneRealArgument(MultiExprArg Args) {
switch (Args.size()) {
case 0:
  return false;

default:
  if (!Args[1]->isDefaultArgument())
    return false;

  LLVM_FALLTHROUGH[[clang::fallthrough]];
case 1:
  return !Args[0]->isDefaultArgument();
}

return false;
12923}

12925ExprResult
12926Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                          NamedDecl *FoundDecl,
                          CXXConstructorDecl *Constructor,
                          MultiExprArg ExprArgs,
                          bool HadMultipleCandidates,
                          bool IsListInitialization,
                          bool IsStdInitListInitialization,
                          bool RequiresZeroInit,
                          unsigned ConstructKind,
                          SourceRange ParenRange) {
bool Elidable = false;

// C++0x [class.copy]p34:
//   When certain criteria are met, an implementation is allowed to
//   omit the copy/move construction of a class object, even if the
//   copy/move constructor and/or destructor for the object have
//   side effects. [...]
//     - when a temporary class object that has not been bound to a
//       reference (12.2) would be copied/moved to a class object
//       with the same cv-unqualified type, the copy/move operation
//       can be omitted by constructing the temporary object
//       directly into the target of the omitted copy/move
if (ConstructKind == CXXConstructExpr::CK_Complete && Constructor &&
    Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) {
  Expr *SubExpr = ExprArgs[0];
  Elidable = SubExpr->isTemporaryObject(
      Context, cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
}

return BuildCXXConstructExpr(ConstructLoc, DeclInitType,
                             FoundDecl, Constructor,
                             Elidable, ExprArgs, HadMultipleCandidates,
                             IsListInitialization,
                             IsStdInitListInitialization, RequiresZeroInit,
                             ConstructKind, ParenRange);
12961}

12963ExprResult
12964Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                          NamedDecl *FoundDecl,
                          CXXConstructorDecl *Constructor,
                          bool Elidable,
                          MultiExprArg ExprArgs,
                          bool HadMultipleCandidates,
                          bool IsListInitialization,
                          bool IsStdInitListInitialization,
                          bool RequiresZeroInit,
                          unsigned ConstructKind,
                          SourceRange ParenRange) {
if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl)) {
  Constructor = findInheritingConstructor(ConstructLoc, Constructor, Shadow);
  if (DiagnoseUseOfDecl(Constructor, ConstructLoc))
    return ExprError();
}

return BuildCXXConstructExpr(
    ConstructLoc, DeclInitType, Constructor, Elidable, ExprArgs,
    HadMultipleCandidates, IsListInitialization, IsStdInitListInitialization,
    RequiresZeroInit, ConstructKind, ParenRange);
12985}

12987/// BuildCXXConstructExpr - Creates a complete call to a constructor,
12988/// including handling of its default argument expressions.
12989ExprResult
12990Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                          CXXConstructorDecl *Constructor,
                          bool Elidable,
                          MultiExprArg ExprArgs,
                          bool HadMultipleCandidates,
                          bool IsListInitialization,
                          bool IsStdInitListInitialization,
                          bool RequiresZeroInit,
                          unsigned ConstructKind,
                          SourceRange ParenRange) {
assert(declaresSameEntity(((declaresSameEntity( Constructor->getParent(), DeclInitType
->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
 "given constructor for wrong type") ? static_cast<void>
 (0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13003, __PRETTY_FUNCTION__))
           Constructor->getParent(),((declaresSameEntity( Constructor->getParent(), DeclInitType
->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
 "given constructor for wrong type") ? static_cast<void>
 (0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13003, __PRETTY_FUNCTION__))
           DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&((declaresSameEntity( Constructor->getParent(), DeclInitType
->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
 "given constructor for wrong type") ? static_cast<void>
 (0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13003, __PRETTY_FUNCTION__))
       "given constructor for wrong type")((declaresSameEntity( Constructor->getParent(), DeclInitType
->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
 "given constructor for wrong type") ? static_cast<void>
 (0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13003, __PRETTY_FUNCTION__));
MarkFunctionReferenced(ConstructLoc, Constructor);
if (getLangOpts().CUDA && !CheckCUDACall(ConstructLoc, Constructor))
  return ExprError();

return CXXConstructExpr::Create(
    Context, DeclInitType, ConstructLoc, Constructor, Elidable,
    ExprArgs, HadMultipleCandidates, IsListInitialization,
    IsStdInitListInitialization, RequiresZeroInit,
    static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind),
    ParenRange);
13014}

13016ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
assert(Field->hasInClassInitializer())((Field->hasInClassInitializer()) ? static_cast<void>
 (0) : __assert_fail ("Field->hasInClassInitializer()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13017, __PRETTY_FUNCTION__));

// If we already have the in-class initializer nothing needs to be done.
if (Field->getInClassInitializer())
  return CXXDefaultInitExpr::Create(Context, Loc, Field);

// If we might have already tried and failed to instantiate, don't try again.
if (Field->isInvalidDecl())
  return ExprError();

// Maybe we haven't instantiated the in-class initializer. Go check the
// pattern FieldDecl to see if it has one.
CXXRecordDecl *ParentRD = cast<CXXRecordDecl>(Field->getParent());

if (isTemplateInstantiation(ParentRD->getTemplateSpecializationKind())) {
  CXXRecordDecl *ClassPattern = ParentRD->getTemplateInstantiationPattern();
  DeclContext::lookup_result Lookup =
      ClassPattern->lookup(Field->getDeclName());

  // Lookup can return at most two results: the pattern for the field, or the
  // injected class name of the parent record. No other member can have the
  // same name as the field.
  // In modules mode, lookup can return multiple results (coming from
  // different modules).
  assert((getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) &&(((getLangOpts().Modules || (!Lookup.empty() && Lookup
.size() <= 2)) && "more than two lookup results for field name"
) ? static_cast<void> (0) : __assert_fail ("(getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) && \"more than two lookup results for field name\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13042, __PRETTY_FUNCTION__))
         "more than two lookup results for field name")(((getLangOpts().Modules || (!Lookup.empty() && Lookup
.size() <= 2)) && "more than two lookup results for field name"
) ? static_cast<void> (0) : __assert_fail ("(getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) && \"more than two lookup results for field name\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13042, __PRETTY_FUNCTION__));
  FieldDecl *Pattern = dyn_cast<FieldDecl>(Lookup[0]);
  if (!Pattern) {
    assert(isa<CXXRecordDecl>(Lookup[0]) &&((isa<CXXRecordDecl>(Lookup[0]) && "cannot have other non-field member with same name"
) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(Lookup[0]) && \"cannot have other non-field member with same name\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13046, __PRETTY_FUNCTION__))
           "cannot have other non-field member with same name")((isa<CXXRecordDecl>(Lookup[0]) && "cannot have other non-field member with same name"
) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(Lookup[0]) && \"cannot have other non-field member with same name\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13046, __PRETTY_FUNCTION__));
    for (auto L : Lookup)
      if (isa<FieldDecl>(L)) {
        Pattern = cast<FieldDecl>(L);
        break;
      }
    assert(Pattern && "We must have set the Pattern!")((Pattern && "We must have set the Pattern!") ? static_cast
<void> (0) : __assert_fail ("Pattern && \"We must have set the Pattern!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13052, __PRETTY_FUNCTION__));
  }

  if (!Pattern->hasInClassInitializer() ||
      InstantiateInClassInitializer(Loc, Field, Pattern,
                                    getTemplateInstantiationArgs(Field))) {
    // Don't diagnose this again.
    Field->setInvalidDecl();
    return ExprError();
  }
  return CXXDefaultInitExpr::Create(Context, Loc, Field);
}

// DR1351:
//   If the brace-or-equal-initializer of a non-static data member
//   invokes a defaulted default constructor of its class or of an
//   enclosing class in a potentially evaluated subexpression, the
//   program is ill-formed.
//
// This resolution is unworkable: the exception specification of the
// default constructor can be needed in an unevaluated context, in
// particular, in the operand of a noexcept-expression, and we can be
// unable to compute an exception specification for an enclosed class.
//
// Any attempt to resolve the exception specification of a defaulted default
// constructor before the initializer is lexically complete will ultimately
// come here at which point we can diagnose it.
RecordDecl *OutermostClass = ParentRD->getOuterLexicalRecordContext();
Diag(Loc, diag::err_in_class_initializer_not_yet_parsed)
    << OutermostClass << Field;
Diag(Field->getEndLoc(), diag::note_in_class_initializer_not_yet_parsed);
// Recover by marking the field invalid, unless we're in a SFINAE context.
if (!isSFINAEContext())
  Field->setInvalidDecl();
return ExprError();
13087}

13089void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) {
if (VD->isInvalidDecl()) return;

CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl());
if (ClassDecl->isInvalidDecl()) return;
if (ClassDecl->hasIrrelevantDestructor()) return;
if (ClassDecl->isDependentContext()) return;

if (VD->isNoDestroy(getASTContext()))
  return;

CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
MarkFunctionReferenced(VD->getLocation(), Destructor);
CheckDestructorAccess(VD->getLocation(), Destructor,
                      PDiag(diag::err_access_dtor_var)
                      << VD->getDeclName()
                      << VD->getType());
DiagnoseUseOfDecl(Destructor, VD->getLocation());

if (Destructor->isTrivial()) return;
if (!VD->hasGlobalStorage()) return;

// Emit warning for non-trivial dtor in global scope (a real global,
// class-static, function-static).
Diag(VD->getLocation(), diag::warn_exit_time_destructor);

// TODO: this should be re-enabled for static locals by !CXAAtExit
if (!VD->isStaticLocal())
  Diag(VD->getLocation(), diag::warn_global_destructor);
13118}

13120/// Given a constructor and the set of arguments provided for the
13121/// constructor, convert the arguments and add any required default arguments
13122/// to form a proper call to this constructor.
13123///
13124/// \returns true if an error occurred, false otherwise.
13125bool
13126Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
                            MultiExprArg ArgsPtr,
                            SourceLocation Loc,
                            SmallVectorImpl<Expr*> &ConvertedArgs,
                            bool AllowExplicit,
                            bool IsListInitialization) {
// FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
unsigned NumArgs = ArgsPtr.size();
Expr **Args = ArgsPtr.data();

const FunctionProtoType *Proto
  = Constructor->getType()->getAs<FunctionProtoType>();
assert(Proto && "Constructor without a prototype?")((Proto && "Constructor without a prototype?") ? static_cast
<void> (0) : __assert_fail ("Proto && \"Constructor without a prototype?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13138, __PRETTY_FUNCTION__));
unsigned NumParams = Proto->getNumParams();

// If too few arguments are available, we'll fill in the rest with defaults.
if (NumArgs < NumParams)
  ConvertedArgs.reserve(NumParams);
else
  ConvertedArgs.reserve(NumArgs);

VariadicCallType CallType =
  Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
SmallVector<Expr *, 8> AllArgs;
bool Invalid = GatherArgumentsForCall(Loc, Constructor,
                                      Proto, 0,
                                      llvm::makeArrayRef(Args, NumArgs),
                                      AllArgs,
                                      CallType, AllowExplicit,
                                      IsListInitialization);
ConvertedArgs.append(AllArgs.begin(), AllArgs.end());

DiagnoseSentinelCalls(Constructor, Loc, AllArgs);

CheckConstructorCall(Constructor,
                     llvm::makeArrayRef(AllArgs.data(), AllArgs.size()),
                     Proto, Loc);

return Invalid;
13165}

13167static inline bool
13168CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
                                     const FunctionDecl *FnDecl) {
const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext();
if (isa<NamespaceDecl>(DC)) {
  return SemaRef.Diag(FnDecl->getLocation(),
                      diag::err_operator_new_delete_declared_in_namespace)
    << FnDecl->getDeclName();
}

if (isa<TranslationUnitDecl>(DC) &&
    FnDecl->getStorageClass() == SC_Static) {
  return SemaRef.Diag(FnDecl->getLocation(),
                      diag::err_operator_new_delete_declared_static)
    << FnDecl->getDeclName();
}

return false;
13185}

13187static QualType
13188RemoveAddressSpaceFromPtr(Sema &SemaRef, const PointerType *PtrTy) {
QualType QTy = PtrTy->getPointeeType();
QTy = SemaRef.Context.removeAddrSpaceQualType(QTy);
return SemaRef.Context.getPointerType(QTy);
13192}

13194static inline bool
13195CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
                          CanQualType ExpectedResultType,
                          CanQualType ExpectedFirstParamType,
                          unsigned DependentParamTypeDiag,
                          unsigned InvalidParamTypeDiag) {
QualType ResultType =
    FnDecl->getType()->getAs<FunctionType>()->getReturnType();

// Check that the result type is not dependent.
if (ResultType->isDependentType())
  return SemaRef.Diag(FnDecl->getLocation(),
                      diag::err_operator_new_delete_dependent_result_type)
  << FnDecl->getDeclName() << ExpectedResultType;

// OpenCL C++: the operator is valid on any address space.
if (SemaRef.getLangOpts().OpenCLCPlusPlus) {
  if (auto *PtrTy = ResultType->getAs<PointerType>()) {
    ResultType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy);
  }
}

// Check that the result type is what we expect.
if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
  return SemaRef.Diag(FnDecl->getLocation(),
                      diag::err_operator_new_delete_invalid_result_type)
  << FnDecl->getDeclName() << ExpectedResultType;

// A function template must have at least 2 parameters.
if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
  return SemaRef.Diag(FnDecl->getLocation(),
                    diag::err_operator_new_delete_template_too_few_parameters)
      << FnDecl->getDeclName();

// The function decl must have at least 1 parameter.
if (FnDecl->getNumParams() == 0)
  return SemaRef.Diag(FnDecl->getLocation(),
                      diag::err_operator_new_delete_too_few_parameters)
    << FnDecl->getDeclName();

// Check the first parameter type is not dependent.
QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
if (FirstParamType->isDependentType())
  return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
    << FnDecl->getDeclName() << ExpectedFirstParamType;

// Check that the first parameter type is what we expect.
if (SemaRef.getLangOpts().OpenCLCPlusPlus) {
  // OpenCL C++: the operator is valid on any address space.
  if (auto *PtrTy =
          FnDecl->getParamDecl(0)->getType()->getAs<PointerType>()) {
    FirstParamType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy);
  }
}
if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
    ExpectedFirstParamType)
  return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
  << FnDecl->getDeclName() << ExpectedFirstParamType;

return false;
13254}

13256static bool
13257CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
// C++ [basic.stc.dynamic.allocation]p1:
//   A program is ill-formed if an allocation function is declared in a
//   namespace scope other than global scope or declared static in global
//   scope.
if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
  return true;

CanQualType SizeTy =
  SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());

// C++ [basic.stc.dynamic.allocation]p1:
//  The return type shall be void*. The first parameter shall have type
//  std::size_t.
if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
                                SizeTy,
                                diag::err_operator_new_dependent_param_type,
                                diag::err_operator_new_param_type))
  return true;

// C++ [basic.stc.dynamic.allocation]p1:
//  The first parameter shall not have an associated default argument.
if (FnDecl->getParamDecl(0)->hasDefaultArg())
  return SemaRef.Diag(FnDecl->getLocation(),
                      diag::err_operator_new_default_arg)
    << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();

return false;
13285}

13287static bool
13288CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) {
// C++ [basic.stc.dynamic.deallocation]p1:
//   A program is ill-formed if deallocation functions are declared in a
//   namespace scope other than global scope or declared static in global
//   scope.
if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
  return true;

auto *MD = dyn_cast<CXXMethodDecl>(FnDecl);

// C++ P0722:
//   Within a class C, the first parameter of a destroying operator delete
//   shall be of type C *. The first parameter of any other deallocation
//   function shall be of type void *.
CanQualType ExpectedFirstParamType =
    MD && MD->isDestroyingOperatorDelete()
        ? SemaRef.Context.getCanonicalType(SemaRef.Context.getPointerType(
              SemaRef.Context.getRecordType(MD->getParent())))
        : SemaRef.Context.VoidPtrTy;

// C++ [basic.stc.dynamic.deallocation]p2:
//   Each deallocation function shall return void
if (CheckOperatorNewDeleteTypes(
        SemaRef, FnDecl, SemaRef.Context.VoidTy, ExpectedFirstParamType,
        diag::err_operator_delete_dependent_param_type,
        diag::err_operator_delete_param_type))
  return true;

// C++ P0722:
//   A destroying operator delete shall be a usual deallocation function.
if (MD && !MD->getParent()->isDependentContext() &&
    MD->isDestroyingOperatorDelete() &&
    !SemaRef.isUsualDeallocationFunction(MD)) {
  SemaRef.Diag(MD->getLocation(),
               diag::err_destroying_operator_delete_not_usual);
  return true;
}

return false;
13327}

13329/// CheckOverloadedOperatorDeclaration - Check whether the declaration
13330/// of this overloaded operator is well-formed. If so, returns false;
13331/// otherwise, emits appropriate diagnostics and returns true.
13332bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
assert(FnDecl && FnDecl->isOverloadedOperator() &&((FnDecl && FnDecl->isOverloadedOperator() &&
 "Expected an overloaded operator declaration") ? static_cast
<void> (0) : __assert_fail ("FnDecl && FnDecl->isOverloadedOperator() && \"Expected an overloaded operator declaration\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13334, __PRETTY_FUNCTION__))
       "Expected an overloaded operator declaration")((FnDecl && FnDecl->isOverloadedOperator() &&
 "Expected an overloaded operator declaration") ? static_cast
<void> (0) : __assert_fail ("FnDecl && FnDecl->isOverloadedOperator() && \"Expected an overloaded operator declaration\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13334, __PRETTY_FUNCTION__));

OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();

// C++ [over.oper]p5:
//   The allocation and deallocation functions, operator new,
//   operator new[], operator delete and operator delete[], are
//   described completely in 3.7.3. The attributes and restrictions
//   found in the rest of this subclause do not apply to them unless
//   explicitly stated in 3.7.3.
if (Op == OO_Delete || Op == OO_Array_Delete)
  return CheckOperatorDeleteDeclaration(*this, FnDecl);

if (Op == OO_New || Op == OO_Array_New)
  return CheckOperatorNewDeclaration(*this, FnDecl);

// C++ [over.oper]p6:
//   An operator function shall either be a non-static member
//   function or be a non-member function and have at least one
//   parameter whose type is a class, a reference to a class, an
//   enumeration, or a reference to an enumeration.
if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
  if (MethodDecl->isStatic())
    return Diag(FnDecl->getLocation(),
                diag::err_operator_overload_static) << FnDecl->getDeclName();
} else {
  bool ClassOrEnumParam = false;
  for (auto Param : FnDecl->parameters()) {
    QualType ParamType = Param->getType().getNonReferenceType();
    if (ParamType->isDependentType() || ParamType->isRecordType() ||
        ParamType->isEnumeralType()) {
      ClassOrEnumParam = true;
      break;
    }
  }

  if (!ClassOrEnumParam)
    return Diag(FnDecl->getLocation(),
                diag::err_operator_overload_needs_class_or_enum)
      << FnDecl->getDeclName();
}

// C++ [over.oper]p8:
//   An operator function cannot have default arguments (8.3.6),
//   except where explicitly stated below.
//
// Only the function-call operator allows default arguments
// (C++ [over.call]p1).
if (Op != OO_Call) {
  for (auto Param : FnDecl->parameters()) {
    if (Param->hasDefaultArg())
      return Diag(Param->getLocation(),
                  diag::err_operator_overload_default_arg)
        << FnDecl->getDeclName() << Param->getDefaultArgRange();
  }
}

static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
  { false, false, false }
13393#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
  , { Unary, Binary, MemberOnly }
13395#include "clang/Basic/OperatorKinds.def"
};

bool CanBeUnaryOperator = OperatorUses[Op][0];
bool CanBeBinaryOperator = OperatorUses[Op][1];
bool MustBeMemberOperator = OperatorUses[Op][2];

// C++ [over.oper]p8:
//   [...] Operator functions cannot have more or fewer parameters
//   than the number required for the corresponding operator, as
//   described in the rest of this subclause.
unsigned NumParams = FnDecl->getNumParams()
                   + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
if (Op != OO_Call &&
    ((NumParams == 1 && !CanBeUnaryOperator) ||
     (NumParams == 2 && !CanBeBinaryOperator) ||
     (NumParams < 1) || (NumParams > 2))) {
  // We have the wrong number of parameters.
  unsigned ErrorKind;
  if (CanBeUnaryOperator && CanBeBinaryOperator) {
    ErrorKind = 2;  // 2 -> unary or binary.
  } else if (CanBeUnaryOperator) {
    ErrorKind = 0;  // 0 -> unary
  } else {
    assert(CanBeBinaryOperator &&((CanBeBinaryOperator && "All non-call overloaded operators are unary or binary!"
) ? static_cast<void> (0) : __assert_fail ("CanBeBinaryOperator && \"All non-call overloaded operators are unary or binary!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13420, __PRETTY_FUNCTION__))
           "All non-call overloaded operators are unary or binary!")((CanBeBinaryOperator && "All non-call overloaded operators are unary or binary!"
) ? static_cast<void> (0) : __assert_fail ("CanBeBinaryOperator && \"All non-call overloaded operators are unary or binary!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13420, __PRETTY_FUNCTION__));
    ErrorKind = 1;  // 1 -> binary
  }

  return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
    << FnDecl->getDeclName() << NumParams << ErrorKind;
}

// Overloaded operators other than operator() cannot be variadic.
if (Op != OO_Call &&
    FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
  return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
    << FnDecl->getDeclName();
}

// Some operators must be non-static member functions.
if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
  return Diag(FnDecl->getLocation(),
              diag::err_operator_overload_must_be_member)
    << FnDecl->getDeclName();
}

// C++ [over.inc]p1:
//   The user-defined function called operator++ implements the
//   prefix and postfix ++ operator. If this function is a member
//   function with no parameters, or a non-member function with one
//   parameter of class or enumeration type, it defines the prefix
//   increment operator ++ for objects of that type. If the function
//   is a member function with one parameter (which shall be of type
//   int) or a non-member function with two parameters (the second
//   of which shall be of type int), it defines the postfix
//   increment operator ++ for objects of that type.
if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
  ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
  QualType ParamType = LastParam->getType();

  if (!ParamType->isSpecificBuiltinType(BuiltinType::Int) &&
      !ParamType->isDependentType())
    return Diag(LastParam->getLocation(),
                diag::err_operator_overload_post_incdec_must_be_int)
      << LastParam->getType() << (Op == OO_MinusMinus);
}

return false;
13464}

13466static bool
13467checkLiteralOperatorTemplateParameterList(Sema &SemaRef,
                                        FunctionTemplateDecl *TpDecl) {
TemplateParameterList *TemplateParams = TpDecl->getTemplateParameters();

// Must have one or two template parameters.
if (TemplateParams->size() == 1) {
  NonTypeTemplateParmDecl *PmDecl =
      dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(0));

  // The template parameter must be a char parameter pack.
  if (PmDecl && PmDecl->isTemplateParameterPack() &&
      SemaRef.Context.hasSameType(PmDecl->getType(), SemaRef.Context.CharTy))
    return false;

} else if (TemplateParams->size() == 2) {
  TemplateTypeParmDecl *PmType =
      dyn_cast<TemplateTypeParmDecl>(TemplateParams->getParam(0));
  NonTypeTemplateParmDecl *PmArgs =
      dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(1));

  // The second template parameter must be a parameter pack with the
  // first template parameter as its type.
  if (PmType && PmArgs && !PmType->isTemplateParameterPack() &&
      PmArgs->isTemplateParameterPack()) {
    const TemplateTypeParmType *TArgs =
        PmArgs->getType()->getAs<TemplateTypeParmType>();
    if (TArgs && TArgs->getDepth() == PmType->getDepth() &&
        TArgs->getIndex() == PmType->getIndex()) {
      if (!SemaRef.inTemplateInstantiation())
        SemaRef.Diag(TpDecl->getLocation(),
                     diag::ext_string_literal_operator_template);
      return false;
    }
  }
}

SemaRef.Diag(TpDecl->getTemplateParameters()->getSourceRange().getBegin(),
             diag::err_literal_operator_template)
    << TpDecl->getTemplateParameters()->getSourceRange();
return true;
13507}

13509/// CheckLiteralOperatorDeclaration - Check whether the declaration
13510/// of this literal operator function is well-formed. If so, returns
13511/// false; otherwise, emits appropriate diagnostics and returns true.
13512bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) {
if (isa<CXXMethodDecl>(FnDecl)) {
  Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace)
    << FnDecl->getDeclName();
  return true;
}

if (FnDecl->isExternC()) {
  Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c);
  if (const LinkageSpecDecl *LSD =
          FnDecl->getDeclContext()->getExternCContext())
    Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here);
  return true;
}

// This might be the definition of a literal operator template.
FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate();

// This might be a specialization of a literal operator template.
if (!TpDecl)
  TpDecl = FnDecl->getPrimaryTemplate();

// template <char...> type operator "" name() and
// template <class T, T...> type operator "" name() are the only valid
// template signatures, and the only valid signatures with no parameters.
if (TpDecl) {
  if (FnDecl->param_size() != 0) {
    Diag(FnDecl->getLocation(),
         diag::err_literal_operator_template_with_params);
    return true;
  }

  if (checkLiteralOperatorTemplateParameterList(*this, TpDecl))
    return true;

} else if (FnDecl->param_size() == 1) {
  const ParmVarDecl *Param = FnDecl->getParamDecl(0);

  QualType ParamType = Param->getType().getUnqualifiedType();

  // Only unsigned long long int, long double, any character type, and const
  // char * are allowed as the only parameters.
  if (ParamType->isSpecificBuiltinType(BuiltinType::ULongLong) ||
      ParamType->isSpecificBuiltinType(BuiltinType::LongDouble) ||
      Context.hasSameType(ParamType, Context.CharTy) ||
      Context.hasSameType(ParamType, Context.WideCharTy) ||
      Context.hasSameType(ParamType, Context.Char8Ty) ||
      Context.hasSameType(ParamType, Context.Char16Ty) ||
      Context.hasSameType(ParamType, Context.Char32Ty)) {
  } else if (const PointerType *Ptr = ParamType->getAs<PointerType>()) {
    QualType InnerType = Ptr->getPointeeType();

    // Pointer parameter must be a const char *.
    if (!(Context.hasSameType(InnerType.getUnqualifiedType(),
                              Context.CharTy) &&
          InnerType.isConstQualified() && !InnerType.isVolatileQualified())) {
      Diag(Param->getSourceRange().getBegin(),
           diag::err_literal_operator_param)
          << ParamType << "'const char *'" << Param->getSourceRange();
      return true;
    }

  } else if (ParamType->isRealFloatingType()) {
    Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param)
        << ParamType << Context.LongDoubleTy << Param->getSourceRange();
    return true;

  } else if (ParamType->isIntegerType()) {
    Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param)
        << ParamType << Context.UnsignedLongLongTy << Param->getSourceRange();
    return true;

  } else {
    Diag(Param->getSourceRange().getBegin(),
         diag::err_literal_operator_invalid_param)
        << ParamType << Param->getSourceRange();
    return true;
  }

} else if (FnDecl->param_size() == 2) {
  FunctionDecl::param_iterator Param = FnDecl->param_begin();

  // First, verify that the first parameter is correct.

  QualType FirstParamType = (*Param)->getType().getUnqualifiedType();

  // Two parameter function must have a pointer to const as a
  // first parameter; let's strip those qualifiers.
  const PointerType *PT = FirstParamType->getAs<PointerType>();

  if (!PT) {
    Diag((*Param)->getSourceRange().getBegin(),
         diag::err_literal_operator_param)
        << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
    return true;
  }

  QualType PointeeType = PT->getPointeeType();
  // First parameter must be const
  if (!PointeeType.isConstQualified() || PointeeType.isVolatileQualified()) {
    Diag((*Param)->getSourceRange().getBegin(),
         diag::err_literal_operator_param)
        << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
    return true;
  }

  QualType InnerType = PointeeType.getUnqualifiedType();
  // Only const char *, const wchar_t*, const char8_t*, const char16_t*, and
  // const char32_t* are allowed as the first parameter to a two-parameter
  // function
  if (!(Context.hasSameType(InnerType, Context.CharTy) ||
        Context.hasSameType(InnerType, Context.WideCharTy) ||
        Context.hasSameType(InnerType, Context.Char8Ty) ||
        Context.hasSameType(InnerType, Context.Char16Ty) ||
        Context.hasSameType(InnerType, Context.Char32Ty))) {
    Diag((*Param)->getSourceRange().getBegin(),
         diag::err_literal_operator_param)
        << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
    return true;
  }

  // Move on to the second and final parameter.
  ++Param;

  // The second parameter must be a std::size_t.
  QualType SecondParamType = (*Param)->getType().getUnqualifiedType();
  if (!Context.hasSameType(SecondParamType, Context.getSizeType())) {
    Diag((*Param)->getSourceRange().getBegin(),
         diag::err_literal_operator_param)
        << SecondParamType << Context.getSizeType()
        << (*Param)->getSourceRange();
    return true;
  }
} else {
  Diag(FnDecl->getLocation(), diag::err_literal_operator_bad_param_count);
  return true;
}

// Parameters are good.

// A parameter-declaration-clause containing a default argument is not
// equivalent to any of the permitted forms.
for (auto Param : FnDecl->parameters()) {
  if (Param->hasDefaultArg()) {
    Diag(Param->getDefaultArgRange().getBegin(),
         diag::err_literal_operator_default_argument)
      << Param->getDefaultArgRange();
    break;
  }
}

StringRef LiteralName
  = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName();
if (LiteralName[0] != '_' &&
    !getSourceManager().isInSystemHeader(FnDecl->getLocation())) {
  // C++11 [usrlit.suffix]p1:
  //   Literal suffix identifiers that do not start with an underscore
  //   are reserved for future standardization.
  Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved)
    << StringLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName);
}

return false;
13675}

13677/// ActOnStartLinkageSpecification - Parsed the beginning of a C++
13678/// linkage specification, including the language and (if present)
13679/// the '{'. ExternLoc is the location of the 'extern', Lang is the
13680/// language string literal. LBraceLoc, if valid, provides the location of
13681/// the '{' brace. Otherwise, this linkage specification does not
13682/// have any braces.
13683Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc,
                                         Expr *LangStr,
                                         SourceLocation LBraceLoc) {
StringLiteral *Lit = cast<StringLiteral>(LangStr);
if (!Lit->isAscii()) {
  Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_not_ascii)
    << LangStr->getSourceRange();
  return nullptr;
}

StringRef Lang = Lit->getString();
LinkageSpecDecl::LanguageIDs Language;
if (Lang == "C")
  Language = LinkageSpecDecl::lang_c;
else if (Lang == "C++")
  Language = LinkageSpecDecl::lang_cxx;
else {
  Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_unknown)
    << LangStr->getSourceRange();
  return nullptr;
}

// FIXME: Add all the various semantics of linkage specifications

LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, ExternLoc,
                                             LangStr->getExprLoc(), Language,
                                             LBraceLoc.isValid());
CurContext->addDecl(D);
PushDeclContext(S, D);
return D;
13713}

13715/// ActOnFinishLinkageSpecification - Complete the definition of
13716/// the C++ linkage specification LinkageSpec. If RBraceLoc is
13717/// valid, it's the position of the closing '}' brace in a linkage
13718/// specification that uses braces.
13719Decl *Sema::ActOnFinishLinkageSpecification(Scope *S,
                                          Decl *LinkageSpec,
                                          SourceLocation RBraceLoc) {
if (RBraceLoc.isValid()) {
  LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec);
  LSDecl->setRBraceLoc(RBraceLoc);
}
PopDeclContext();
return LinkageSpec;
13728}

13730Decl *Sema::ActOnEmptyDeclaration(Scope *S,
                                const ParsedAttributesView &AttrList,
                                SourceLocation SemiLoc) {
Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc);
// Attribute declarations appertain to empty declaration so we handle
// them here.
ProcessDeclAttributeList(S, ED, AttrList);

CurContext->addDecl(ED);
return ED;
13740}

13742/// Perform semantic analysis for the variable declaration that
13743/// occurs within a C++ catch clause, returning the newly-created
13744/// variable.
13745VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
                                       TypeSourceInfo *TInfo,
                                       SourceLocation StartLoc,
                                       SourceLocation Loc,
                                       IdentifierInfo *Name) {
bool Invalid = false;
QualType ExDeclType = TInfo->getType();

// Arrays and functions decay.
if (ExDeclType->isArrayType())
  ExDeclType = Context.getArrayDecayedType(ExDeclType);
else if (ExDeclType->isFunctionType())
  ExDeclType = Context.getPointerType(ExDeclType);

// C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
// The exception-declaration shall not denote a pointer or reference to an
// incomplete type, other than [cv] void*.
// N2844 forbids rvalue references.
if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
  Diag(Loc, diag::err_catch_rvalue_ref);
  Invalid = true;
}

if (ExDeclType->isVariablyModifiedType()) {
  Diag(Loc, diag::err_catch_variably_modified) << ExDeclType;
  Invalid = true;
}

QualType BaseType = ExDeclType;
int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
unsigned DK = diag::err_catch_incomplete;
if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
  BaseType = Ptr->getPointeeType();
  Mode = 1;
  DK = diag::err_catch_incomplete_ptr;
} else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
  // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
  BaseType = Ref->getPointeeType();
  Mode = 2;
  DK = diag::err_catch_incomplete_ref;
}
if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
    !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
  Invalid = true;

if (!Invalid && !ExDeclType->isDependentType() &&
    RequireNonAbstractType(Loc, ExDeclType,
                           diag::err_abstract_type_in_decl,
                           AbstractVariableType))
  Invalid = true;

// Only the non-fragile NeXT runtime currently supports C++ catches
// of ObjC types, and no runtime supports catching ObjC types by value.
if (!Invalid && getLangOpts().ObjC) {
  QualType T = ExDeclType;
  if (const ReferenceType *RT = T->getAs<ReferenceType>())
    T = RT->getPointeeType();

  if (T->isObjCObjectType()) {
    Diag(Loc, diag::err_objc_object_catch);
    Invalid = true;
  } else if (T->isObjCObjectPointerType()) {
    // FIXME: should this be a test for macosx-fragile specifically?
    if (getLangOpts().ObjCRuntime.isFragile())
      Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile);
  }
}

VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name,
                                  ExDeclType, TInfo, SC_None);
ExDecl->setExceptionVariable(true);

// In ARC, infer 'retaining' for variables of retainable type.
if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl))
  Invalid = true;

if (!Invalid && !ExDeclType->isDependentType()) {
  if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
    // Insulate this from anything else we might currently be parsing.
    EnterExpressionEvaluationContext scope(
        *this, ExpressionEvaluationContext::PotentiallyEvaluated);

    // C++ [except.handle]p16:
    //   The object declared in an exception-declaration or, if the
    //   exception-declaration does not specify a name, a temporary (12.2) is
    //   copy-initialized (8.5) from the exception object. [...]
    //   The object is destroyed when the handler exits, after the destruction
    //   of any automatic objects initialized within the handler.
    //
    // We just pretend to initialize the object with itself, then make sure
    // it can be destroyed later.
    QualType initType = Context.getExceptionObjectType(ExDeclType);

    InitializedEntity entity =
      InitializedEntity::InitializeVariable(ExDecl);
    InitializationKind initKind =
      InitializationKind::CreateCopy(Loc, SourceLocation());

    Expr *opaqueValue =
      new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary);
    InitializationSequence sequence(*this, entity, initKind, opaqueValue);
    ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue);
    if (result.isInvalid())
      Invalid = true;
    else {
      // If the constructor used was non-trivial, set this as the
      // "initializer".
      CXXConstructExpr *construct = result.getAs<CXXConstructExpr>();
      if (!construct->getConstructor()->isTrivial()) {
        Expr *init = MaybeCreateExprWithCleanups(construct);
        ExDecl->setInit(init);
      }

      // And make sure it's destructable.
      FinalizeVarWithDestructor(ExDecl, recordType);
    }
  }
}

if (Invalid)
  ExDecl->setInvalidDecl();

return ExDecl;
13868}

13870/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
13871/// handler.
13872Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
bool Invalid = D.isInvalidType();

// Check for unexpanded parameter packs.
if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
                                    UPPC_ExceptionType)) {
  TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
                                           D.getIdentifierLoc());
  Invalid = true;
}

IdentifierInfo *II = D.getIdentifier();
if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(),
                                           LookupOrdinaryName,
                                           ForVisibleRedeclaration)) {
  // The scope should be freshly made just for us. There is just no way
  // it contains any previous declaration, except for function parameters in
  // a function-try-block's catch statement.
  assert(!S->isDeclScope(PrevDecl))((!S->isDeclScope(PrevDecl)) ? static_cast<void> (0)
 : __assert_fail ("!S->isDeclScope(PrevDecl)", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13891, __PRETTY_FUNCTION__));
  if (isDeclInScope(PrevDecl, CurContext, S)) {
    Diag(D.getIdentifierLoc(), diag::err_redefinition)
      << D.getIdentifier();
    Diag(PrevDecl->getLocation(), diag::note_previous_definition);
    Invalid = true;
  } else if (PrevDecl->isTemplateParameter())
    // Maybe we will complain about the shadowed template parameter.
    DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
}

if (D.getCXXScopeSpec().isSet() && !Invalid) {
  Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
    << D.getCXXScopeSpec().getRange();
  Invalid = true;
}

VarDecl *ExDecl = BuildExceptionDeclaration(
    S, TInfo, D.getBeginLoc(), D.getIdentifierLoc(), D.getIdentifier());
if (Invalid)
  ExDecl->setInvalidDecl();

// Add the exception declaration into this scope.
if (II)
  PushOnScopeChains(ExDecl, S);
else
  CurContext->addDecl(ExDecl);

ProcessDeclAttributes(S, ExDecl, D);
return ExDecl;
13921}

13923Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
                                       Expr *AssertExpr,
                                       Expr *AssertMessageExpr,
                                       SourceLocation RParenLoc) {
StringLiteral *AssertMessage =
    AssertMessageExpr ? cast<StringLiteral>(AssertMessageExpr) : nullptr;

if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression))
  return nullptr;

return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr,
                                    AssertMessage, RParenLoc, false);
13935}

13937Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
                                       Expr *AssertExpr,
                                       StringLiteral *AssertMessage,
                                       SourceLocation RParenLoc,
                                       bool Failed) {
assert(AssertExpr != nullptr && "Expected non-null condition")((AssertExpr != nullptr && "Expected non-null condition"
) ? static_cast<void> (0) : __assert_fail ("AssertExpr != nullptr && \"Expected non-null condition\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 13942, __PRETTY_FUNCTION__));
if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() &&
    !Failed) {
  // In a static_assert-declaration, the constant-expression shall be a
  // constant expression that can be contextually converted to bool.
  ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr);
  if (Converted.isInvalid())
    Failed = true;
  else
    Converted = ConstantExpr::Create(Context, Converted.get());

  llvm::APSInt Cond;
  if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond,
        diag::err_static_assert_expression_is_not_constant,
        /*AllowFold=*/false).isInvalid())
    Failed = true;

  if (!Failed && !Cond) {
    SmallString<256> MsgBuffer;
    llvm::raw_svector_ostream Msg(MsgBuffer);
    if (AssertMessage)
      AssertMessage->printPretty(Msg, nullptr, getPrintingPolicy());

    Expr *InnerCond = nullptr;
    std::string InnerCondDescription;
    std::tie(InnerCond, InnerCondDescription) =
      findFailedBooleanCondition(Converted.get());
    if (InnerCond && !isa<CXXBoolLiteralExpr>(InnerCond)
                  && !isa<IntegerLiteral>(InnerCond)) {
      Diag(StaticAssertLoc, diag::err_static_assert_requirement_failed)
        << InnerCondDescription << !AssertMessage
        << Msg.str() << InnerCond->getSourceRange();
    } else {
      Diag(StaticAssertLoc, diag::err_static_assert_failed)
        << !AssertMessage << Msg.str() << AssertExpr->getSourceRange();
    }
    Failed = true;
  }
}

ExprResult FullAssertExpr = ActOnFinishFullExpr(AssertExpr, StaticAssertLoc,
                                                /*DiscardedValue*/false,
                                                /*IsConstexpr*/true);
if (FullAssertExpr.isInvalid())
  Failed = true;
else
  AssertExpr = FullAssertExpr.get();

Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc,
                                      AssertExpr, AssertMessage, RParenLoc,
                                      Failed);

CurContext->addDecl(Decl);
return Decl;
13996}

13998/// Perform semantic analysis of the given friend type declaration.
13999///
14000/// \returns A friend declaration that.
14001FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart,
                                    SourceLocation FriendLoc,
                                    TypeSourceInfo *TSInfo) {
assert(TSInfo && "NULL TypeSourceInfo for friend type declaration")((TSInfo && "NULL TypeSourceInfo for friend type declaration"
) ? static_cast<void> (0) : __assert_fail ("TSInfo && \"NULL TypeSourceInfo for friend type declaration\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14004, __PRETTY_FUNCTION__));

QualType T = TSInfo->getType();
SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange();

// C++03 [class.friend]p2:
//   An elaborated-type-specifier shall be used in a friend declaration
//   for a class.*
//
//   * The class-key of the elaborated-type-specifier is required.
if (!CodeSynthesisContexts.empty()) {
  // Do not complain about the form of friend template types during any kind
  // of code synthesis. For template instantiation, we will have complained
  // when the template was defined.
} else {
  if (!T->isElaboratedTypeSpecifier()) {
    // If we evaluated the type to a record type, suggest putting
    // a tag in front.
    if (const RecordType *RT = T->getAs<RecordType>()) {
      RecordDecl *RD = RT->getDecl();

      SmallString<16> InsertionText(" ");
      InsertionText += RD->getKindName();

      Diag(TypeRange.getBegin(),
           getLangOpts().CPlusPlus11 ?
             diag::warn_cxx98_compat_unelaborated_friend_type :
             diag::ext_unelaborated_friend_type)
        << (unsigned) RD->getTagKind()
        << T
        << FixItHint::CreateInsertion(getLocForEndOfToken(FriendLoc),
                                      InsertionText);
    } else {
      Diag(FriendLoc,
           getLangOpts().CPlusPlus11 ?
             diag::warn_cxx98_compat_nonclass_type_friend :
             diag::ext_nonclass_type_friend)
        << T
        << TypeRange;
    }
  } else if (T->getAs<EnumType>()) {
    Diag(FriendLoc,
         getLangOpts().CPlusPlus11 ?
           diag::warn_cxx98_compat_enum_friend :
           diag::ext_enum_friend)
      << T
      << TypeRange;
  }

  // C++11 [class.friend]p3:
  //   A friend declaration that does not declare a function shall have one
  //   of the following forms:
  //     friend elaborated-type-specifier ;
  //     friend simple-type-specifier ;
  //     friend typename-specifier ;
  if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc)
    Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T;
}

//   If the type specifier in a friend declaration designates a (possibly
//   cv-qualified) class type, that class is declared as a friend; otherwise,
//   the friend declaration is ignored.
return FriendDecl::Create(Context, CurContext,
                          TSInfo->getTypeLoc().getBeginLoc(), TSInfo,
                          FriendLoc);
14069}

14071/// Handle a friend tag declaration where the scope specifier was
14072/// templated.
14073Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
                                  unsigned TagSpec, SourceLocation TagLoc,
                                  CXXScopeSpec &SS, IdentifierInfo *Name,
                                  SourceLocation NameLoc,
                                  const ParsedAttributesView &Attr,
                                  MultiTemplateParamsArg TempParamLists) {
TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);

bool IsMemberSpecialization = false;
bool Invalid = false;

if (TemplateParameterList *TemplateParams =
        MatchTemplateParametersToScopeSpecifier(
            TagLoc, NameLoc, SS, nullptr, TempParamLists, /*friend*/ true,
            IsMemberSpecialization, Invalid)) {
  if (TemplateParams->size() > 0) {
    // This is a declaration of a class template.
    if (Invalid)
      return nullptr;

    return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, SS, Name,
                              NameLoc, Attr, TemplateParams, AS_public,
                              /*ModulePrivateLoc=*/SourceLocation(),
                              FriendLoc, TempParamLists.size() - 1,
                              TempParamLists.data()).get();
  } else {
    // The "template<>" header is extraneous.
    Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
      << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
    IsMemberSpecialization = true;
  }
}

if (Invalid) return nullptr;

bool isAllExplicitSpecializations = true;
for (unsigned I = TempParamLists.size(); I-- > 0; ) {
  if (TempParamLists[I]->size()) {
    isAllExplicitSpecializations = false;
    break;
  }
}

// FIXME: don't ignore attributes.

// If it's explicit specializations all the way down, just forget
// about the template header and build an appropriate non-templated
// friend.  TODO: for source fidelity, remember the headers.
if (isAllExplicitSpecializations) {
  if (SS.isEmpty()) {
    bool Owned = false;
    bool IsDependent = false;
    return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc,
                    Attr, AS_public,
                    /*ModulePrivateLoc=*/SourceLocation(),
                    MultiTemplateParamsArg(), Owned, IsDependent,
                    /*ScopedEnumKWLoc=*/SourceLocation(),
                    /*ScopedEnumUsesClassTag=*/false,
                    /*UnderlyingType=*/TypeResult(),
                    /*IsTypeSpecifier=*/false,
                    /*IsTemplateParamOrArg=*/false);
  }

  NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
  ElaboratedTypeKeyword Keyword
    = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
  QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc,
                                 *Name, NameLoc);
  if (T.isNull())
    return nullptr;

  TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
  if (isa<DependentNameType>(T)) {
    DependentNameTypeLoc TL =
        TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
    TL.setElaboratedKeywordLoc(TagLoc);
    TL.setQualifierLoc(QualifierLoc);
    TL.setNameLoc(NameLoc);
  } else {
    ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>();
    TL.setElaboratedKeywordLoc(TagLoc);
    TL.setQualifierLoc(QualifierLoc);
    TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc);
  }

  FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
                                          TSI, FriendLoc, TempParamLists);
  Friend->setAccess(AS_public);
  CurContext->addDecl(Friend);
  return Friend;
}

assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?")((SS.isNotEmpty() && "valid templated tag with no SS and no direct?"
) ? static_cast<void> (0) : __assert_fail ("SS.isNotEmpty() && \"valid templated tag with no SS and no direct?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14165, __PRETTY_FUNCTION__));



// Handle the case of a templated-scope friend class.  e.g.
//   template <class T> class A<T>::B;
// FIXME: we don't support these right now.
Diag(NameLoc, diag::warn_template_qualified_friend_unsupported)
  << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext);
ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name);
TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
TL.setElaboratedKeywordLoc(TagLoc);
TL.setQualifierLoc(SS.getWithLocInContext(Context));
TL.setNameLoc(NameLoc);

FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
                                        TSI, FriendLoc, TempParamLists);
Friend->setAccess(AS_public);
Friend->setUnsupportedFriend(true);
CurContext->addDecl(Friend);
return Friend;
14188}

14190/// Handle a friend type declaration.  This works in tandem with
14191/// ActOnTag.
14192///
14193/// Notes on friend class templates:
14194///
14195/// We generally treat friend class declarations as if they were
14196/// declaring a class.  So, for example, the elaborated type specifier
14197/// in a friend declaration is required to obey the restrictions of a
14198/// class-head (i.e. no typedefs in the scope chain), template
14199/// parameters are required to match up with simple template-ids, &c.
14200/// However, unlike when declaring a template specialization, it's
14201/// okay to refer to a template specialization without an empty
14202/// template parameter declaration, e.g.
14203///   friend class A<T>::B<unsigned>;
14204/// We permit this as a special case; if there are any template
14205/// parameters present at all, require proper matching, i.e.
14206///   template <> template \<class T> friend class A<int>::B;
14207Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
                              MultiTemplateParamsArg TempParams) {
SourceLocation Loc = DS.getBeginLoc();

assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail
 ("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14211, __PRETTY_FUNCTION__));
assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified)((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) ? static_cast
<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_unspecified"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14212, __PRETTY_FUNCTION__));

// C++ [class.friend]p3:
// A friend declaration that does not declare a function shall have one of
// the following forms:
//     friend elaborated-type-specifier ;
//     friend simple-type-specifier ;
//     friend typename-specifier ;
//
// Any declaration with a type qualifier does not have that form. (It's
// legal to specify a qualified type as a friend, you just can't write the
// keywords.)
if (DS.getTypeQualifiers()) {
  if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
    Diag(DS.getConstSpecLoc(), diag::err_friend_decl_spec) << "const";
  if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
    Diag(DS.getVolatileSpecLoc(), diag::err_friend_decl_spec) << "volatile";
  if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
    Diag(DS.getRestrictSpecLoc(), diag::err_friend_decl_spec) << "restrict";
  if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
    Diag(DS.getAtomicSpecLoc(), diag::err_friend_decl_spec) << "_Atomic";
  if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned)
    Diag(DS.getUnalignedSpecLoc(), diag::err_friend_decl_spec) << "__unaligned";
}

// Try to convert the decl specifier to a type.  This works for
// friend templates because ActOnTag never produces a ClassTemplateDecl
// for a TUK_Friend.
Declarator TheDeclarator(DS, DeclaratorContext::MemberContext);
TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S);
QualType T = TSI->getType();
if (TheDeclarator.isInvalidType())
  return nullptr;

if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration))
  return nullptr;

// This is definitely an error in C++98.  It's probably meant to
// be forbidden in C++0x, too, but the specification is just
// poorly written.
//
// The problem is with declarations like the following:
//   template <T> friend A<T>::foo;
// where deciding whether a class C is a friend or not now hinges
// on whether there exists an instantiation of A that causes
// 'foo' to equal C.  There are restrictions on class-heads
// (which we declare (by fiat) elaborated friend declarations to
// be) that makes this tractable.
//
// FIXME: handle "template <> friend class A<T>;", which
// is possibly well-formed?  Who even knows?
if (TempParams.size() && !T->isElaboratedTypeSpecifier()) {
  Diag(Loc, diag::err_tagless_friend_type_template)
    << DS.getSourceRange();
  return nullptr;
}

// C++98 [class.friend]p1: A friend of a class is a function
//   or class that is not a member of the class . . .
// This is fixed in DR77, which just barely didn't make the C++03
// deadline.  It's also a very silly restriction that seriously
// affects inner classes and which nobody else seems to implement;
// thus we never diagnose it, not even in -pedantic.
//
// But note that we could warn about it: it's always useless to
// friend one of your own members (it's not, however, worthless to
// friend a member of an arbitrary specialization of your template).

Decl *D;
if (!TempParams.empty())
  D = FriendTemplateDecl::Create(Context, CurContext, Loc,
                                 TempParams,
                                 TSI,
                                 DS.getFriendSpecLoc());
else
  D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI);

if (!D)
  return nullptr;

D->setAccess(AS_public);
CurContext->addDecl(D);

return D;
14296}

14298NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D,
                                      MultiTemplateParamsArg TemplateParams) {
const DeclSpec &DS = D.getDeclSpec();

assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail
 ("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14302, __PRETTY_FUNCTION__));
assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified)((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) ? static_cast
<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_unspecified"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14303, __PRETTY_FUNCTION__));

SourceLocation Loc = D.getIdentifierLoc();
TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);

// C++ [class.friend]p1
//   A friend of a class is a function or class....
// Note that this sees through typedefs, which is intended.
// It *doesn't* see through dependent types, which is correct
// according to [temp.arg.type]p3:
//   If a declaration acquires a function type through a
//   type dependent on a template-parameter and this causes
//   a declaration that does not use the syntactic form of a
//   function declarator to have a function type, the program
//   is ill-formed.
if (!TInfo->getType()->isFunctionType()) {
  Diag(Loc, diag::err_unexpected_friend);

  // It might be worthwhile to try to recover by creating an
  // appropriate declaration.
  return nullptr;
}

// C++ [namespace.memdef]p3
//  - If a friend declaration in a non-local class first declares a
//    class or function, the friend class or function is a member
//    of the innermost enclosing namespace.
//  - The name of the friend is not found by simple name lookup
//    until a matching declaration is provided in that namespace
//    scope (either before or after the class declaration granting
//    friendship).
//  - If a friend function is called, its name may be found by the
//    name lookup that considers functions from namespaces and
//    classes associated with the types of the function arguments.
//  - When looking for a prior declaration of a class or a function
//    declared as a friend, scopes outside the innermost enclosing
//    namespace scope are not considered.

CXXScopeSpec &SS = D.getCXXScopeSpec();
DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
assert(NameInfo.getName())((NameInfo.getName()) ? static_cast<void> (0) : __assert_fail
 ("NameInfo.getName()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14343, __PRETTY_FUNCTION__));

// Check for unexpanded parameter packs.
if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) ||
    DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) ||
    DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration))
  return nullptr;

// The context we found the declaration in, or in which we should
// create the declaration.
DeclContext *DC;
Scope *DCScope = S;
LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
                      ForExternalRedeclaration);

// There are five cases here.
//   - There's no scope specifier and we're in a local class. Only look
//     for functions declared in the immediately-enclosing block scope.
// We recover from invalid scope qualifiers as if they just weren't there.
FunctionDecl *FunctionContainingLocalClass = nullptr;
if ((SS.isInvalid() || !SS.isSet()) &&
    (FunctionContainingLocalClass =
         cast<CXXRecordDecl>(CurContext)->isLocalClass())) {
  // C++11 [class.friend]p11:
  //   If a friend declaration appears in a local class and the name
  //   specified is an unqualified name, a prior declaration is
  //   looked up without considering scopes that are outside the
  //   innermost enclosing non-class scope. For a friend function
  //   declaration, if there is no prior declaration, the program is
  //   ill-formed.

  // Find the innermost enclosing non-class scope. This is the block
  // scope containing the local class definition (or for a nested class,
  // the outer local class).
  DCScope = S->getFnParent();

  // Look up the function name in the scope.
  Previous.clear(LookupLocalFriendName);
  LookupName(Previous, S, /*AllowBuiltinCreation*/false);

  if (!Previous.empty()) {
    // All possible previous declarations must have the same context:
    // either they were declared at block scope or they are members of
    // one of the enclosing local classes.
    DC = Previous.getRepresentativeDecl()->getDeclContext();
  } else {
    // This is ill-formed, but provide the context that we would have
    // declared the function in, if we were permitted to, for error recovery.
    DC = FunctionContainingLocalClass;
  }
  adjustContextForLocalExternDecl(DC);

  // C++ [class.friend]p6:
  //   A function can be defined in a friend declaration of a class if and
  //   only if the class is a non-local class (9.8), the function name is
  //   unqualified, and the function has namespace scope.
  if (D.isFunctionDefinition()) {
    Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class);
  }

//   - There's no scope specifier, in which case we just go to the
//     appropriate scope and look for a function or function template
//     there as appropriate.
} else if (SS.isInvalid() || !SS.isSet()) {
  // C++11 [namespace.memdef]p3:
  //   If the name in a friend declaration is neither qualified nor
  //   a template-id and the declaration is a function or an
  //   elaborated-type-specifier, the lookup to determine whether
  //   the entity has been previously declared shall not consider
  //   any scopes outside the innermost enclosing namespace.
  bool isTemplateId =
      D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId;

  // Find the appropriate context according to the above.
  DC = CurContext;

  // Skip class contexts.  If someone can cite chapter and verse
  // for this behavior, that would be nice --- it's what GCC and
  // EDG do, and it seems like a reasonable intent, but the spec
  // really only says that checks for unqualified existing
  // declarations should stop at the nearest enclosing namespace,
  // not that they should only consider the nearest enclosing
  // namespace.
  while (DC->isRecord())
    DC = DC->getParent();

  DeclContext *LookupDC = DC;
  while (LookupDC->isTransparentContext())
    LookupDC = LookupDC->getParent();

  while (true) {
    LookupQualifiedName(Previous, LookupDC);

    if (!Previous.empty()) {
      DC = LookupDC;
      break;
    }

    if (isTemplateId) {
      if (isa<TranslationUnitDecl>(LookupDC)) break;
    } else {
      if (LookupDC->isFileContext()) break;
    }
    LookupDC = LookupDC->getParent();
  }

  DCScope = getScopeForDeclContext(S, DC);

//   - There's a non-dependent scope specifier, in which case we
//     compute it and do a previous lookup there for a function
//     or function template.
} else if (!SS.getScopeRep()->isDependent()) {
  DC = computeDeclContext(SS);
  if (!DC) return nullptr;

  if (RequireCompleteDeclContext(SS, DC)) return nullptr;

  LookupQualifiedName(Previous, DC);

  // C++ [class.friend]p1: A friend of a class is a function or
  //   class that is not a member of the class . . .
  if (DC->Equals(CurContext))
    Diag(DS.getFriendSpecLoc(),
         getLangOpts().CPlusPlus11 ?
           diag::warn_cxx98_compat_friend_is_member :
           diag::err_friend_is_member);

  if (D.isFunctionDefinition()) {
    // C++ [class.friend]p6:
    //   A function can be defined in a friend declaration of a class if and
    //   only if the class is a non-local class (9.8), the function name is
    //   unqualified, and the function has namespace scope.
    //
    // FIXME: We should only do this if the scope specifier names the
    // innermost enclosing namespace; otherwise the fixit changes the
    // meaning of the code.
    SemaDiagnosticBuilder DB
      = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def);

    DB << SS.getScopeRep();
    if (DC->isFileContext())
      DB << FixItHint::CreateRemoval(SS.getRange());
    SS.clear();
  }

//   - There's a scope specifier that does not match any template
//     parameter lists, in which case we use some arbitrary context,
//     create a method or method template, and wait for instantiation.
//   - There's a scope specifier that does match some template
//     parameter lists, which we don't handle right now.
} else {
  if (D.isFunctionDefinition()) {
    // C++ [class.friend]p6:
    //   A function can be defined in a friend declaration of a class if and
    //   only if the class is a non-local class (9.8), the function name is
    //   unqualified, and the function has namespace scope.
    Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def)
      << SS.getScopeRep();
  }

  DC = CurContext;
  assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?")((isa<CXXRecordDecl>(DC) && "friend declaration not in class?"
) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(DC) && \"friend declaration not in class?\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14504, __PRETTY_FUNCTION__));
}

if (!DC->isRecord()) {
  int DiagArg = -1;
  switch (D.getName().getKind()) {
  case UnqualifiedIdKind::IK_ConstructorTemplateId:
  case UnqualifiedIdKind::IK_ConstructorName:
    DiagArg = 0;
    break;
  case UnqualifiedIdKind::IK_DestructorName:
    DiagArg = 1;
    break;
  case UnqualifiedIdKind::IK_ConversionFunctionId:
    DiagArg = 2;
    break;
  case UnqualifiedIdKind::IK_DeductionGuideName:
    DiagArg = 3;
    break;
  case UnqualifiedIdKind::IK_Identifier:
  case UnqualifiedIdKind::IK_ImplicitSelfParam:
  case UnqualifiedIdKind::IK_LiteralOperatorId:
  case UnqualifiedIdKind::IK_OperatorFunctionId:
  case UnqualifiedIdKind::IK_TemplateId:
    break;
  }
  // This implies that it has to be an operator or function.
  if (DiagArg >= 0) {
    Diag(Loc, diag::err_introducing_special_friend) << DiagArg;
    return nullptr;
  }
}

// FIXME: This is an egregious hack to cope with cases where the scope stack
// does not contain the declaration context, i.e., in an out-of-line
// definition of a class.
Scope FakeDCScope(S, Scope::DeclScope, Diags);
if (!DCScope) {
  FakeDCScope.setEntity(DC);
  DCScope = &FakeDCScope;
}

bool AddToScope = true;
NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous,
                                        TemplateParams, AddToScope);
if (!ND) return nullptr;

assert(ND->getLexicalDeclContext() == CurContext)((ND->getLexicalDeclContext() == CurContext) ? static_cast
<void> (0) : __assert_fail ("ND->getLexicalDeclContext() == CurContext"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14551, __PRETTY_FUNCTION__));

// If we performed typo correction, we might have added a scope specifier
// and changed the decl context.
DC = ND->getDeclContext();

// Add the function declaration to the appropriate lookup tables,
// adjusting the redeclarations list as necessary.  We don't
// want to do this yet if the friending class is dependent.
//
// Also update the scope-based lookup if the target context's
// lookup context is in lexical scope.
if (!CurContext->isDependentContext()) {
  DC = DC->getRedeclContext();
  DC->makeDeclVisibleInContext(ND);
  if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
    PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
}

FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
                                     D.getIdentifierLoc(), ND,
                                     DS.getFriendSpecLoc());
FrD->setAccess(AS_public);
CurContext->addDecl(FrD);

if (ND->isInvalidDecl()) {
  FrD->setInvalidDecl();
} else {
  if (DC->isRecord()) CheckFriendAccess(ND);

  FunctionDecl *FD;
  if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
    FD = FTD->getTemplatedDecl();
  else
    FD = cast<FunctionDecl>(ND);

  // C++11 [dcl.fct.default]p4: If a friend declaration specifies a
  // default argument expression, that declaration shall be a definition
  // and shall be the only declaration of the function or function
  // template in the translation unit.
  if (functionDeclHasDefaultArgument(FD)) {
    // We can't look at FD->getPreviousDecl() because it may not have been set
    // if we're in a dependent context. If the function is known to be a
    // redeclaration, we will have narrowed Previous down to the right decl.
    if (D.isRedeclaration()) {
      Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
      Diag(Previous.getRepresentativeDecl()->getLocation(),
           diag::note_previous_declaration);
    } else if (!D.isFunctionDefinition())
      Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def);
  }

  // Mark templated-scope function declarations as unsupported.
  if (FD->getNumTemplateParameterLists() && SS.isValid()) {
    Diag(FD->getLocation(), diag::warn_template_qualified_friend_unsupported)
      << SS.getScopeRep() << SS.getRange()
      << cast<CXXRecordDecl>(CurContext);
    FrD->setUnsupportedFriend(true);
  }
}

return ND;
14613}

14615void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
AdjustDeclIfTemplate(Dcl);

FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl);
if (!Fn) {
  Diag(DelLoc, diag::err_deleted_non_function);
  return;
}

// Deleted function does not have a body.
Fn->setWillHaveBody(false);

if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
  // Don't consider the implicit declaration we generate for explicit
  // specializations. FIXME: Do not generate these implicit declarations.
  if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization ||
       Prev->getPreviousDecl()) &&
      !Prev->isDefined()) {
    Diag(DelLoc, diag::err_deleted_decl_not_first);
    Diag(Prev->getLocation().isInvalid() ? DelLoc : Prev->getLocation(),
         Prev->isImplicit() ? diag::note_previous_implicit_declaration
                            : diag::note_previous_declaration);
  }
  // If the declaration wasn't the first, we delete the function anyway for
  // recovery.
  Fn = Fn->getCanonicalDecl();
}

// dllimport/dllexport cannot be deleted.
if (const InheritableAttr *DLLAttr = getDLLAttr(Fn)) {
  Diag(Fn->getLocation(), diag::err_attribute_dll_deleted) << DLLAttr;
  Fn->setInvalidDecl();
}

if (Fn->isDeleted())
  return;

// See if we're deleting a function which is already known to override a
// non-deleted virtual function.
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) {
  bool IssuedDiagnostic = false;
  for (const CXXMethodDecl *O : MD->overridden_methods()) {
    if (!(*MD->begin_overridden_methods())->isDeleted()) {
      if (!IssuedDiagnostic) {
        Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName();
        IssuedDiagnostic = true;
      }
      Diag(O->getLocation(), diag::note_overridden_virtual_function);
    }
  }
  // If this function was implicitly deleted because it was defaulted,
  // explain why it was deleted.
  if (IssuedDiagnostic && MD->isDefaulted())
    ShouldDeleteSpecialMember(MD, getSpecialMember(MD), nullptr,
                              /*Diagnose*/true);
}

// C++11 [basic.start.main]p3:
//   A program that defines main as deleted [...] is ill-formed.
if (Fn->isMain())
  Diag(DelLoc, diag::err_deleted_main);

// C++11 [dcl.fct.def.delete]p4:
//  A deleted function is implicitly inline.
Fn->setImplicitlyInline();
Fn->setDeletedAsWritten();
14681}

14683void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl);

if (MD) {
  if (MD->getParent()->isDependentType()) {
    MD->setDefaulted();
    MD->setExplicitlyDefaulted();
    return;
  }

  CXXSpecialMember Member = getSpecialMember(MD);
  if (Member == CXXInvalid) {
    if (!MD->isInvalidDecl())
      Diag(DefaultLoc, diag::err_default_special_members);
    return;
  }

  MD->setDefaulted();
  MD->setExplicitlyDefaulted();

  // Unset that we will have a body for this function. We might not,
  // if it turns out to be trivial, and we don't need this marking now
  // that we've marked it as defaulted.
  MD->setWillHaveBody(false);

  // If this definition appears within the record, do the checking when
  // the record is complete.
  const FunctionDecl *Primary = MD;
  if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern())
    // Ask the template instantiation pattern that actually had the
    // '= default' on it.
    Primary = Pattern;

  // If the method was defaulted on its first declaration, we will have
  // already performed the checking in CheckCompletedCXXClass. Such a
  // declaration doesn't trigger an implicit definition.
  if (Primary->getCanonicalDecl()->isDefaulted())
    return;

  CheckExplicitlyDefaultedSpecialMember(MD);

  if (!MD->isInvalidDecl())
    DefineImplicitSpecialMember(*this, MD, DefaultLoc);
} else {
  Diag(DefaultLoc, diag::err_default_special_members);
}
14729}

14731static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
for (Stmt *SubStmt : S->children()) {
  if (!SubStmt)
    continue;
  if (isa<ReturnStmt>(SubStmt))
    Self.Diag(SubStmt->getBeginLoc(),
              diag::err_return_in_constructor_handler);
  if (!isa<Expr>(SubStmt))
    SearchForReturnInStmt(Self, SubStmt);
}
14741}

14743void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
  CXXCatchStmt *Handler = TryBlock->getHandler(I);
  SearchForReturnInStmt(*this, Handler);
}
14748}

14750bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
                                           const CXXMethodDecl *Old) {
const auto *NewFT = New->getType()->getAs<FunctionProtoType>();
const auto *OldFT = Old->getType()->getAs<FunctionProtoType>();

if (OldFT->hasExtParameterInfos()) {
  for (unsigned I = 0, E = OldFT->getNumParams(); I != E; ++I)
    // A parameter of the overriding method should be annotated with noescape
    // if the corresponding parameter of the overridden method is annotated.
    if (OldFT->getExtParameterInfo(I).isNoEscape() &&
        !NewFT->getExtParameterInfo(I).isNoEscape()) {
      Diag(New->getParamDecl(I)->getLocation(),
           diag::warn_overriding_method_missing_noescape);
      Diag(Old->getParamDecl(I)->getLocation(),
           diag::note_overridden_marked_noescape);
    }
}

// Virtual overrides must have the same code_seg.
const auto *OldCSA = Old->getAttr<CodeSegAttr>();
const auto *NewCSA = New->getAttr<CodeSegAttr>();
if ((NewCSA || OldCSA) &&
    (!OldCSA || !NewCSA || NewCSA->getName() != OldCSA->getName())) {
  Diag(New->getLocation(), diag::err_mismatched_code_seg_override);
  Diag(Old->getLocation(), diag::note_previous_declaration);
  return true;
}

CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv();

// If the calling conventions match, everything is fine
if (NewCC == OldCC)
  return false;

// If the calling conventions mismatch because the new function is static,
// suppress the calling convention mismatch error; the error about static
// function override (err_static_overrides_virtual from
// Sema::CheckFunctionDeclaration) is more clear.
if (New->getStorageClass() == SC_Static)
  return false;

Diag(New->getLocation(),
     diag::err_conflicting_overriding_cc_attributes)
  << New->getDeclName() << New->getType() << Old->getType();
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
14796}

14798bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
                                           const CXXMethodDecl *Old) {
QualType NewTy = New->getType()->getAs<FunctionType>()->getReturnType();
QualType OldTy = Old->getType()->getAs<FunctionType>()->getReturnType();

if (Context.hasSameType(NewTy, OldTy) ||
    NewTy->isDependentType() || OldTy->isDependentType())
  return false;

// Check if the return types are covariant
QualType NewClassTy, OldClassTy;

/// Both types must be pointers or references to classes.
if (const PointerType *NewPT = NewTy->getAs<PointerType>()) {
  if (const PointerType *OldPT = OldTy->getAs<PointerType>()) {
    NewClassTy = NewPT->getPointeeType();
    OldClassTy = OldPT->getPointeeType();
  }
} else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) {
  if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) {
    if (NewRT->getTypeClass() == OldRT->getTypeClass()) {
      NewClassTy = NewRT->getPointeeType();
      OldClassTy = OldRT->getPointeeType();
    }
  }
}

// The return types aren't either both pointers or references to a class type.
if (NewClassTy.isNull()) {
  Diag(New->getLocation(),
       diag::err_different_return_type_for_overriding_virtual_function)
      << New->getDeclName() << NewTy << OldTy
      << New->getReturnTypeSourceRange();
  Diag(Old->getLocation(), diag::note_overridden_virtual_function)
      << Old->getReturnTypeSourceRange();

  return true;
}

if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
  // C++14 [class.virtual]p8:
  //   If the class type in the covariant return type of D::f differs from
  //   that of B::f, the class type in the return type of D::f shall be
  //   complete at the point of declaration of D::f or shall be the class
  //   type D.
  if (const RecordType *RT = NewClassTy->getAs<RecordType>()) {
    if (!RT->isBeingDefined() &&
        RequireCompleteType(New->getLocation(), NewClassTy,
                            diag::err_covariant_return_incomplete,
                            New->getDeclName()))
      return true;
  }

  // Check if the new class derives from the old class.
  if (!IsDerivedFrom(New->getLocation(), NewClassTy, OldClassTy)) {
    Diag(New->getLocation(), diag::err_covariant_return_not_derived)
        << New->getDeclName() << NewTy << OldTy
        << New->getReturnTypeSourceRange();
    Diag(Old->getLocation(), diag::note_overridden_virtual_function)
        << Old->getReturnTypeSourceRange();
    return true;
  }

  // Check if we the conversion from derived to base is valid.
  if (CheckDerivedToBaseConversion(
          NewClassTy, OldClassTy,
          diag::err_covariant_return_inaccessible_base,
          diag::err_covariant_return_ambiguous_derived_to_base_conv,
          New->getLocation(), New->getReturnTypeSourceRange(),
          New->getDeclName(), nullptr)) {
    // FIXME: this note won't trigger for delayed access control
    // diagnostics, and it's impossible to get an undelayed error
    // here from access control during the original parse because
    // the ParsingDeclSpec/ParsingDeclarator are still in scope.
    Diag(Old->getLocation(), diag::note_overridden_virtual_function)
        << Old->getReturnTypeSourceRange();
    return true;
  }
}

// The qualifiers of the return types must be the same.
if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) {
  Diag(New->getLocation(),
       diag::err_covariant_return_type_different_qualifications)
      << New->getDeclName() << NewTy << OldTy
      << New->getReturnTypeSourceRange();
  Diag(Old->getLocation(), diag::note_overridden_virtual_function)
      << Old->getReturnTypeSourceRange();
  return true;
}


// The new class type must have the same or less qualifiers as the old type.
if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
  Diag(New->getLocation(),
       diag::err_covariant_return_type_class_type_more_qualified)
      << New->getDeclName() << NewTy << OldTy
      << New->getReturnTypeSourceRange();
  Diag(Old->getLocation(), diag::note_overridden_virtual_function)
      << Old->getReturnTypeSourceRange();
  return true;
}

return false;
14902}

14904/// Mark the given method pure.
14905///
14906/// \param Method the method to be marked pure.
14907///
14908/// \param InitRange the source range that covers the "0" initializer.
14909bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
SourceLocation EndLoc = InitRange.getEnd();
if (EndLoc.isValid())
  Method->setRangeEnd(EndLoc);

if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
  Method->setPure();
  return false;
}

if (!Method->isInvalidDecl())
  Diag(Method->getLocation(), diag::err_non_virtual_pure)
    << Method->getDeclName() << InitRange;
return true;
14923}

14925void Sema::ActOnPureSpecifier(Decl *D, SourceLocation ZeroLoc) {
if (D->getFriendObjectKind())
  Diag(D->getLocation(), diag::err_pure_friend);
else if (auto *M = dyn_cast<CXXMethodDecl>(D))
  CheckPureMethod(M, ZeroLoc);
else
  Diag(D->getLocation(), diag::err_illegal_initializer);
14932}

14934/// Determine whether the given declaration is a global variable or
14935/// static data member.
14936static bool isNonlocalVariable(const Decl *D) {
if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D))
  return Var->hasGlobalStorage();

return false;
14941}

14943/// Invoked when we are about to parse an initializer for the declaration
14944/// 'Dcl'.
14945///
14946/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
14947/// static data member of class X, names should be looked up in the scope of
14948/// class X. If the declaration had a scope specifier, a scope will have
14949/// been created and passed in for this purpose. Otherwise, S will be null.
14950void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
// If there is no declaration, there was an error parsing it.
if (!D || D->isInvalidDecl())
  return;

// We will always have a nested name specifier here, but this declaration
// might not be out of line if the specifier names the current namespace:
//   extern int n;
//   int ::n = 0;
if (S && D->isOutOfLine())
  EnterDeclaratorContext(S, D->getDeclContext());

// If we are parsing the initializer for a static data member, push a
// new expression evaluation context that is associated with this static
// data member.
if (isNonlocalVariable(D))
  PushExpressionEvaluationContext(
      ExpressionEvaluationContext::PotentiallyEvaluated, D);
14968}

14970/// Invoked after we are finished parsing an initializer for the declaration D.
14971void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) {
// If there is no declaration, there was an error parsing it.
if (!D || D->isInvalidDecl())
  return;

if (isNonlocalVariable(D))
  PopExpressionEvaluationContext();

if (S && D->isOutOfLine())
  ExitDeclaratorContext(S);
14981}

14983/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
14984/// C++ if/switch/while/for statement.
14985/// e.g: "if (int x = f()) {...}"
14986DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
// C++ 6.4p2:
// The declarator shall not specify a function or an array.
// The type-specifier-seq shall not contain typedef and shall not declare a
// new class or enumeration.
assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&((D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef
 && "Parser allowed 'typedef' as storage class of condition decl."
) ? static_cast<void> (0) : __assert_fail ("D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && \"Parser allowed 'typedef' as storage class of condition decl.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14992, __PRETTY_FUNCTION__))
       "Parser allowed 'typedef' as storage class of condition decl.")((D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef
 && "Parser allowed 'typedef' as storage class of condition decl."
) ? static_cast<void> (0) : __assert_fail ("D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && \"Parser allowed 'typedef' as storage class of condition decl.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 14992, __PRETTY_FUNCTION__));

Decl *Dcl = ActOnDeclarator(S, D);
if (!Dcl)
  return true;

if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function.
  Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type)
    << D.getSourceRange();
  return true;
}

return Dcl;
15005}

15007void Sema::LoadExternalVTableUses() {
if (!ExternalSource)
  return;

SmallVector<ExternalVTableUse, 4> VTables;
ExternalSource->ReadUsedVTables(VTables);
SmallVector<VTableUse, 4> NewUses;
for (unsigned I = 0, N = VTables.size(); I != N; ++I) {
  llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos
    = VTablesUsed.find(VTables[I].Record);
  // Even if a definition wasn't required before, it may be required now.
  if (Pos != VTablesUsed.end()) {
    if (!Pos->second && VTables[I].DefinitionRequired)
      Pos->second = true;
    continue;
  }

  VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired;
  NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location));
}

VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end());
15029}

15031void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
                        bool DefinitionRequired) {
// Ignore any vtable uses in unevaluated operands or for classes that do
// not have a vtable.
if (!Class->isDynamicClass() || Class->isDependentContext() ||
    CurContext->isDependentContext() || isUnevaluatedContext())
  return;
// Do not mark as used if compiling for the device outside of the target
// region.
if (LangOpts.OpenMP && LangOpts.OpenMPIsDevice &&
    !isInOpenMPDeclareTargetContext() &&
    !isInOpenMPTargetExecutionDirective()) {
  if (!DefinitionRequired)
    MarkVirtualMembersReferenced(Loc, Class);
  return;
}

// Try to insert this class into the map.
LoadExternalVTableUses();
Class = Class->getCanonicalDecl();
std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool>
  Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired));
if (!Pos.second) {
  // If we already had an entry, check to see if we are promoting this vtable
  // to require a definition. If so, we need to reappend to the VTableUses
  // list, since we may have already processed the first entry.
  if (DefinitionRequired && !Pos.first->second) {
    Pos.first->second = true;
  } else {
    // Otherwise, we can early exit.
    return;
  }
} else {
  // The Microsoft ABI requires that we perform the destructor body
  // checks (i.e. operator delete() lookup) when the vtable is marked used, as
  // the deleting destructor is emitted with the vtable, not with the
  // destructor definition as in the Itanium ABI.
  if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
    CXXDestructorDecl *DD = Class->getDestructor();
    if (DD && DD->isVirtual() && !DD->isDeleted()) {
      if (Class->hasUserDeclaredDestructor() && !DD->isDefined()) {
        // If this is an out-of-line declaration, marking it referenced will
        // not do anything. Manually call CheckDestructor to look up operator
        // delete().
        ContextRAII SavedContext(*this, DD);
        CheckDestructor(DD);
      } else {
        MarkFunctionReferenced(Loc, Class->getDestructor());
      }
    }
  }
}

// Local classes need to have their virtual members marked
// immediately. For all other classes, we mark their virtual members
// at the end of the translation unit.
if (Class->isLocalClass())
  MarkVirtualMembersReferenced(Loc, Class);
else
  VTableUses.push_back(std::make_pair(Class, Loc));
15091}

15093bool Sema::DefineUsedVTables() {
LoadExternalVTableUses();
if (VTableUses.empty())
  return false;

// Note: The VTableUses vector could grow as a result of marking
// the members of a class as "used", so we check the size each
// time through the loop and prefer indices (which are stable) to
// iterators (which are not).
bool DefinedAnything = false;
for (unsigned I = 0; I != VTableUses.size(); ++I) {
  CXXRecordDecl *Class = VTableUses[I].first->getDefinition();
  if (!Class)
    continue;
  TemplateSpecializationKind ClassTSK =
      Class->getTemplateSpecializationKind();

  SourceLocation Loc = VTableUses[I].second;

  bool DefineVTable = true;

  // If this class has a key function, but that key function is
  // defined in another translation unit, we don't need to emit the
  // vtable even though we're using it.
  const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class);
  if (KeyFunction && !KeyFunction->hasBody()) {
    // The key function is in another translation unit.
    DefineVTable = false;
    TemplateSpecializationKind TSK =
        KeyFunction->getTemplateSpecializationKind();
    assert(TSK != TSK_ExplicitInstantiationDefinition &&((TSK != TSK_ExplicitInstantiationDefinition && TSK !=
 TSK_ImplicitInstantiation && "Instantiations don't have key functions"
) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && \"Instantiations don't have key functions\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 15125, __PRETTY_FUNCTION__))
           TSK != TSK_ImplicitInstantiation &&((TSK != TSK_ExplicitInstantiationDefinition && TSK !=
 TSK_ImplicitInstantiation && "Instantiations don't have key functions"
) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && \"Instantiations don't have key functions\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 15125, __PRETTY_FUNCTION__))
           "Instantiations don't have key functions")((TSK != TSK_ExplicitInstantiationDefinition && TSK !=
 TSK_ImplicitInstantiation && "Instantiations don't have key functions"
) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && \"Instantiations don't have key functions\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 15125, __PRETTY_FUNCTION__));
    (void)TSK;
  } else if (!KeyFunction) {
    // If we have a class with no key function that is the subject
    // of an explicit instantiation declaration, suppress the
    // vtable; it will live with the explicit instantiation
    // definition.
    bool IsExplicitInstantiationDeclaration =
        ClassTSK == TSK_ExplicitInstantiationDeclaration;
    for (auto R : Class->redecls()) {
      TemplateSpecializationKind TSK
        = cast<CXXRecordDecl>(R)->getTemplateSpecializationKind();
      if (TSK == TSK_ExplicitInstantiationDeclaration)
        IsExplicitInstantiationDeclaration = true;
      else if (TSK == TSK_ExplicitInstantiationDefinition) {
        IsExplicitInstantiationDeclaration = false;
        break;
      }
    }

    if (IsExplicitInstantiationDeclaration)
      DefineVTable = false;
  }

  // The exception specifications for all virtual members may be needed even
  // if we are not providing an authoritative form of the vtable in this TU.
  // We may choose to emit it available_externally anyway.
  if (!DefineVTable) {
    MarkVirtualMemberExceptionSpecsNeeded(Loc, Class);
    continue;
  }

  // Mark all of the virtual members of this class as referenced, so
  // that we can build a vtable. Then, tell the AST consumer that a
  // vtable for this class is required.
  DefinedAnything = true;
  MarkVirtualMembersReferenced(Loc, Class);
  CXXRecordDecl *Canonical = Class->getCanonicalDecl();
  if (VTablesUsed[Canonical])
    Consumer.HandleVTable(Class);

  // Warn if we're emitting a weak vtable. The vtable will be weak if there is
  // no key function or the key function is inlined. Don't warn in C++ ABIs
  // that lack key functions, since the user won't be able to make one.
  if (Context.getTargetInfo().getCXXABI().hasKeyFunctions() &&
      Class->isExternallyVisible() && ClassTSK != TSK_ImplicitInstantiation) {
    const FunctionDecl *KeyFunctionDef = nullptr;
    if (!KeyFunction || (KeyFunction->hasBody(KeyFunctionDef) &&
                         KeyFunctionDef->isInlined())) {
      Diag(Class->getLocation(),
           ClassTSK == TSK_ExplicitInstantiationDefinition
               ? diag::warn_weak_template_vtable
               : diag::warn_weak_vtable)
          << Class;
    }
  }
}
VTableUses.clear();

return DefinedAnything;
15185}

15187void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
                                               const CXXRecordDecl *RD) {
for (const auto *I : RD->methods())
  if (I->isVirtual() && !I->isPure())
    ResolveExceptionSpec(Loc, I->getType()->castAs<FunctionProtoType>());
15192}

15194void Sema::MarkVirtualMembersReferenced(SourceLocation Loc,
                                      const CXXRecordDecl *RD) {
// Mark all functions which will appear in RD's vtable as used.
CXXFinalOverriderMap FinalOverriders;
RD->getFinalOverriders(FinalOverriders);
for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(),
                                          E = FinalOverriders.end();
     I != E; ++I) {
  for (OverridingMethods::const_iterator OI = I->second.begin(),
                                         OE = I->second.end();
       OI != OE; ++OI) {
    assert(OI->second.size() > 0 && "no final overrider")((OI->second.size() > 0 && "no final overrider"
) ? static_cast<void> (0) : __assert_fail ("OI->second.size() > 0 && \"no final overrider\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 15205, __PRETTY_FUNCTION__));
    CXXMethodDecl *Overrider = OI->second.front().Method;

    // C++ [basic.def.odr]p2:
    //   [...] A virtual member function is used if it is not pure. [...]
    if (!Overrider->isPure())
      MarkFunctionReferenced(Loc, Overrider);
  }
}

// Only classes that have virtual bases need a VTT.
if (RD->getNumVBases() == 0)
  return;

for (const auto &I : RD->bases()) {
  const CXXRecordDecl *Base =
      cast<CXXRecordDecl>(I.getType()->getAs<RecordType>()->getDecl());
  if (Base->getNumVBases() == 0)
    continue;
  MarkVirtualMembersReferenced(Loc, Base);
}
15226}

15228/// SetIvarInitializers - This routine builds initialization ASTs for the
15229/// Objective-C implementation whose ivars need be initialized.
15230void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) {
if (!getLangOpts().CPlusPlus)
  return;
if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) {
  SmallVector<ObjCIvarDecl*, 8> ivars;
  CollectIvarsToConstructOrDestruct(OID, ivars);
  if (ivars.empty())
    return;
  SmallVector<CXXCtorInitializer*, 32> AllToInit;
  for (unsigned i = 0; i < ivars.size(); i++) {
    FieldDecl *Field = ivars[i];
    if (Field->isInvalidDecl())
      continue;

    CXXCtorInitializer *Member;
    InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
    InitializationKind InitKind =
      InitializationKind::CreateDefault(ObjCImplementation->getLocation());

    InitializationSequence InitSeq(*this, InitEntity, InitKind, None);
    ExprResult MemberInit =
      InitSeq.Perform(*this, InitEntity, InitKind, None);
    MemberInit = MaybeCreateExprWithCleanups(MemberInit);
    // Note, MemberInit could actually come back empty if no initialization
    // is required (e.g., because it would call a trivial default constructor)
    if (!MemberInit.get() || MemberInit.isInvalid())
      continue;

    Member =
      new (Context) CXXCtorInitializer(Context, Field, SourceLocation(),
                                       SourceLocation(),
                                       MemberInit.getAs<Expr>(),
                                       SourceLocation());
    AllToInit.push_back(Member);

    // Be sure that the destructor is accessible and is marked as referenced.
    if (const RecordType *RecordTy =
            Context.getBaseElementType(Field->getType())
                ->getAs<RecordType>()) {
      CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
      if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
        MarkFunctionReferenced(Field->getLocation(), Destructor);
        CheckDestructorAccess(Field->getLocation(), Destructor,
                          PDiag(diag::err_access_dtor_ivar)
                            << Context.getBaseElementType(Field->getType()));
      }
    }
  }
  ObjCImplementation->setIvarInitializers(Context,
                                          AllToInit.data(), AllToInit.size());
}
15281}

15283static
15284void DelegatingCycleHelper(CXXConstructorDecl* Ctor,
                         llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Valid,
                         llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Invalid,
                         llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Current,
                         Sema &S) {
if (Ctor->isInvalidDecl())
  return;

CXXConstructorDecl *Target = Ctor->getTargetConstructor();

// Target may not be determinable yet, for instance if this is a dependent
// call in an uninstantiated template.
if (Target) {
  const FunctionDecl *FNTarget = nullptr;
  (void)Target->hasBody(FNTarget);
  Target = const_cast<CXXConstructorDecl*>(
    cast_or_null<CXXConstructorDecl>(FNTarget));
}

CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(),
                   // Avoid dereferencing a null pointer here.
                   *TCanonical = Target? Target->getCanonicalDecl() : nullptr;

if (!Current.insert(Canonical).second)
  return;

// We know that beyond here, we aren't chaining into a cycle.
if (!Target || !Target->isDelegatingConstructor() ||
    Target->isInvalidDecl() || Valid.count(TCanonical)) {
  Valid.insert(Current.begin(), Current.end());
  Current.clear();
// We've hit a cycle.
} else if (TCanonical == Canonical || Invalid.count(TCanonical) ||
           Current.count(TCanonical)) {
  // If we haven't diagnosed this cycle yet, do so now.
  if (!Invalid.count(TCanonical)) {
    S.Diag((*Ctor->init_begin())->getSourceLocation(),
           diag::warn_delegating_ctor_cycle)
      << Ctor;

    // Don't add a note for a function delegating directly to itself.
    if (TCanonical != Canonical)
      S.Diag(Target->getLocation(), diag::note_it_delegates_to);

    CXXConstructorDecl *C = Target;
    while (C->getCanonicalDecl() != Canonical) {
      const FunctionDecl *FNTarget = nullptr;
      (void)C->getTargetConstructor()->hasBody(FNTarget);
      assert(FNTarget && "Ctor cycle through bodiless function")((FNTarget && "Ctor cycle through bodiless function")
 ? static_cast<void> (0) : __assert_fail ("FNTarget && \"Ctor cycle through bodiless function\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 15332, __PRETTY_FUNCTION__));

      C = const_cast<CXXConstructorDecl*>(
        cast<CXXConstructorDecl>(FNTarget));
      S.Diag(C->getLocation(), diag::note_which_delegates_to);
    }
  }

  Invalid.insert(Current.begin(), Current.end());
  Current.clear();
} else {
  DelegatingCycleHelper(Target, Valid, Invalid, Current, S);
}
15345}


15348void Sema::CheckDelegatingCtorCycles() {
llvm::SmallPtrSet<CXXConstructorDecl*, 4> Valid, Invalid, Current;

for (DelegatingCtorDeclsType::iterator
       I = DelegatingCtorDecls.begin(ExternalSource),
       E = DelegatingCtorDecls.end();
     I != E; ++I)
  DelegatingCycleHelper(*I, Valid, Invalid, Current, *this);

for (auto CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI)
  (*CI)->setInvalidDecl();
15359}

15361namespace {
/// AST visitor that finds references to the 'this' expression.
class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> {
  Sema &S;

public:
  explicit FindCXXThisExpr(Sema &S) : S(S) { }

  bool VisitCXXThisExpr(CXXThisExpr *E) {
    S.Diag(E->getLocation(), diag::err_this_static_member_func)
      << E->isImplicit();
    return false;
  }
};
15375}

15377bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) {
TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
if (!TSInfo)
  return false;

TypeLoc TL = TSInfo->getTypeLoc();
FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
if (!ProtoTL)
  return false;

// C++11 [expr.prim.general]p3:
//   [The expression this] shall not appear before the optional
//   cv-qualifier-seq and it shall not appear within the declaration of a
//   static member function (although its type and value category are defined
//   within a static member function as they are within a non-static member
//   function). [ Note: this is because declaration matching does not occur
//  until the complete declarator is known. - end note ]
const FunctionProtoType *Proto = ProtoTL.getTypePtr();
FindCXXThisExpr Finder(*this);

// If the return type came after the cv-qualifier-seq, check it now.
if (Proto->hasTrailingReturn() &&
    !Finder.TraverseTypeLoc(ProtoTL.getReturnLoc()))
  return true;

// Check the exception specification.
if (checkThisInStaticMemberFunctionExceptionSpec(Method))
  return true;

return checkThisInStaticMemberFunctionAttributes(Method);
15407}

15409bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) {
TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
if (!TSInfo)
  return false;

TypeLoc TL = TSInfo->getTypeLoc();
FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
if (!ProtoTL)
  return false;

const FunctionProtoType *Proto = ProtoTL.getTypePtr();
FindCXXThisExpr Finder(*this);

switch (Proto->getExceptionSpecType()) {
case EST_Unparsed:
case EST_Uninstantiated:
case EST_Unevaluated:
case EST_BasicNoexcept:
case EST_DynamicNone:
case EST_MSAny:
case EST_None:
  break;

case EST_DependentNoexcept:
case EST_NoexceptFalse:
case EST_NoexceptTrue:
  if (!Finder.TraverseStmt(Proto->getNoexceptExpr()))
    return true;
  LLVM_FALLTHROUGH[[clang::fallthrough]];

case EST_Dynamic:
  for (const auto &E : Proto->exceptions()) {
    if (!Finder.TraverseType(E))
      return true;
  }
  break;
}

return false;
15448}

15450bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) {
FindCXXThisExpr Finder(*this);

// Check attributes.
for (const auto *A : Method->attrs()) {
  // FIXME: This should be emitted by tblgen.
  Expr *Arg = nullptr;
  ArrayRef<Expr *> Args;
  if (const auto *G = dyn_cast<GuardedByAttr>(A))
    Arg = G->getArg();
  else if (const auto *G = dyn_cast<PtGuardedByAttr>(A))
    Arg = G->getArg();
  else if (const auto *AA = dyn_cast<AcquiredAfterAttr>(A))
    Args = llvm::makeArrayRef(AA->args_begin(), AA->args_size());
  else if (const auto *AB = dyn_cast<AcquiredBeforeAttr>(A))
    Args = llvm::makeArrayRef(AB->args_begin(), AB->args_size());
  else if (const auto *ETLF = dyn_cast<ExclusiveTrylockFunctionAttr>(A)) {
    Arg = ETLF->getSuccessValue();
    Args = llvm::makeArrayRef(ETLF->args_begin(), ETLF->args_size());
  } else if (const auto *STLF = dyn_cast<SharedTrylockFunctionAttr>(A)) {
    Arg = STLF->getSuccessValue();
    Args = llvm::makeArrayRef(STLF->args_begin(), STLF->args_size());
  } else if (const auto *LR = dyn_cast<LockReturnedAttr>(A))
    Arg = LR->getArg();
  else if (const auto *LE = dyn_cast<LocksExcludedAttr>(A))
    Args = llvm::makeArrayRef(LE->args_begin(), LE->args_size());
  else if (const auto *RC = dyn_cast<RequiresCapabilityAttr>(A))
    Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size());
  else if (const auto *AC = dyn_cast<AcquireCapabilityAttr>(A))
    Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size());
  else if (const auto *AC = dyn_cast<TryAcquireCapabilityAttr>(A))
    Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size());
  else if (const auto *RC = dyn_cast<ReleaseCapabilityAttr>(A))
    Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size());

  if (Arg && !Finder.TraverseStmt(Arg))
    return true;

  for (unsigned I = 0, N = Args.size(); I != N; ++I) {
    if (!Finder.TraverseStmt(Args[I]))
      return true;
  }
}

return false;
15495}

15497void Sema::checkExceptionSpecification(
  bool IsTopLevel, ExceptionSpecificationType EST,
  ArrayRef<ParsedType> DynamicExceptions,
  ArrayRef<SourceRange> DynamicExceptionRanges, Expr *NoexceptExpr,
  SmallVectorImpl<QualType> &Exceptions,
  FunctionProtoType::ExceptionSpecInfo &ESI) {
Exceptions.clear();
ESI.Type = EST;
if (EST == EST_Dynamic) {
  Exceptions.reserve(DynamicExceptions.size());
  for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) {
    // FIXME: Preserve type source info.
    QualType ET = GetTypeFromParser(DynamicExceptions[ei]);

    if (IsTopLevel) {
      SmallVector<UnexpandedParameterPack, 2> Unexpanded;
      collectUnexpandedParameterPacks(ET, Unexpanded);
      if (!Unexpanded.empty()) {
        DiagnoseUnexpandedParameterPacks(
            DynamicExceptionRanges[ei].getBegin(), UPPC_ExceptionType,
            Unexpanded);
        continue;
      }
    }

    // Check that the type is valid for an exception spec, and
    // drop it if not.
    if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei]))
      Exceptions.push_back(ET);
  }
  ESI.Exceptions = Exceptions;
  return;
}

if (isComputedNoexcept(EST)) {
  assert((NoexceptExpr->isTypeDependent() ||(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType
()->getCanonicalTypeUnqualified() == Context.BoolTy) &&
 "Parser should have made sure that the expression is boolean"
) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 15535, __PRETTY_FUNCTION__))
          NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType
()->getCanonicalTypeUnqualified() == Context.BoolTy) &&
 "Parser should have made sure that the expression is boolean"
) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 15535, __PRETTY_FUNCTION__))
          Context.BoolTy) &&(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType
()->getCanonicalTypeUnqualified() == Context.BoolTy) &&
 "Parser should have made sure that the expression is boolean"
) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 15535, __PRETTY_FUNCTION__))
         "Parser should have made sure that the expression is boolean")(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType
()->getCanonicalTypeUnqualified() == Context.BoolTy) &&
 "Parser should have made sure that the expression is boolean"
) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 15535, __PRETTY_FUNCTION__));
  if (IsTopLevel && DiagnoseUnexpandedParameterPack(NoexceptExpr)) {
    ESI.Type = EST_BasicNoexcept;
    return;
  }

  ESI.NoexceptExpr = NoexceptExpr;
  return;
}
15544}

15546void Sema::actOnDelayedExceptionSpecification(Decl *MethodD,
           ExceptionSpecificationType EST,
           SourceRange SpecificationRange,
           ArrayRef<ParsedType> DynamicExceptions,
           ArrayRef<SourceRange> DynamicExceptionRanges,
           Expr *NoexceptExpr) {
if (!MethodD)
  return;

// Dig out the method we're referring to.
if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD))
  MethodD = FunTmpl->getTemplatedDecl();

CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(MethodD);
if (!Method)
  return;

// Check the exception specification.
llvm::SmallVector<QualType, 4> Exceptions;
FunctionProtoType::ExceptionSpecInfo ESI;
checkExceptionSpecification(/*IsTopLevel*/true, EST, DynamicExceptions,
                            DynamicExceptionRanges, NoexceptExpr, Exceptions,
                            ESI);

// Update the exception specification on the function type.
Context.adjustExceptionSpec(Method, ESI, /*AsWritten*/true);

if (Method->isStatic())
  checkThisInStaticMemberFunctionExceptionSpec(Method);

if (Method->isVirtual()) {
  // Check overrides, which we previously had to delay.
  for (const CXXMethodDecl *O : Method->overridden_methods())
    CheckOverridingFunctionExceptionSpec(Method, O);
}
15581}

15583/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class.
15584///
15585MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record,
                                     SourceLocation DeclStart, Declarator &D,
                                     Expr *BitWidth,
                                     InClassInitStyle InitStyle,
                                     AccessSpecifier AS,
                                     const ParsedAttr &MSPropertyAttr) {
IdentifierInfo *II = D.getIdentifier();
if (!II) {
  Diag(DeclStart, diag::err_anonymous_property);
  return nullptr;
}
SourceLocation Loc = D.getIdentifierLoc();

TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
QualType T = TInfo->getType();
if (getLangOpts().CPlusPlus) {
  CheckExtraCXXDefaultArguments(D);

  if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
                                      UPPC_DataMemberType)) {
    D.setInvalidType();
    T = Context.IntTy;
    TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
  }
}

DiagnoseFunctionSpecifiers(D.getDeclSpec());

if (D.getDeclSpec().isInlineSpecified())
  Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function)
      << getLangOpts().CPlusPlus17;
if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
  Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
       diag::err_invalid_thread)
    << DeclSpec::getSpecifierName(TSCS);

// Check to see if this name was declared as a member previously
NamedDecl *PrevDecl = nullptr;
LookupResult Previous(*this, II, Loc, LookupMemberName,
                      ForVisibleRedeclaration);
LookupName(Previous, S);
switch (Previous.getResultKind()) {
case LookupResult::Found:
case LookupResult::FoundUnresolvedValue:
  PrevDecl = Previous.getAsSingle<NamedDecl>();
  break;

case LookupResult::FoundOverloaded:
  PrevDecl = Previous.getRepresentativeDecl();
  break;

case LookupResult::NotFound:
case LookupResult::NotFoundInCurrentInstantiation:
case LookupResult::Ambiguous:
  break;
}

if (PrevDecl && PrevDecl->isTemplateParameter()) {
  // Maybe we will complain about the shadowed template parameter.
  DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
  // Just pretend that we didn't see the previous declaration.
  PrevDecl = nullptr;
}

if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
  PrevDecl = nullptr;

SourceLocation TSSL = D.getBeginLoc();
MSPropertyDecl *NewPD =
    MSPropertyDecl::Create(Context, Record, Loc, II, T, TInfo, TSSL,
                           MSPropertyAttr.getPropertyDataGetter(),
                           MSPropertyAttr.getPropertyDataSetter());
ProcessDeclAttributes(TUScope, NewPD, D);
NewPD->setAccess(AS);

if (NewPD->isInvalidDecl())
  Record->setInvalidDecl();

if (D.getDeclSpec().isModulePrivateSpecified())
  NewPD->setModulePrivate();

if (NewPD->isInvalidDecl() && PrevDecl) {
  // Don't introduce NewFD into scope; there's already something
  // with the same name in the same scope.
} else if (II) {
  PushOnScopeChains(NewPD, S);
} else
  Record->addDecl(NewPD);

return NewPD;
15675}

←

/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h

1//===--- Sema.h - Semantic Analysis & AST Building --------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the Sema class, which performs semantic analysis and
10// builds ASTs.
11//
12//===----------------------------------------------------------------------===//

14#ifndef LLVM_CLANG_SEMA_SEMA_H
15#define LLVM_CLANG_SEMA_SEMA_H

17#include "clang/AST/Attr.h"
18#include "clang/AST/Availability.h"
19#include "clang/AST/ComparisonCategories.h"
20#include "clang/AST/DeclTemplate.h"
21#include "clang/AST/DeclarationName.h"
22#include "clang/AST/Expr.h"
23#include "clang/AST/ExprCXX.h"
24#include "clang/AST/ExprObjC.h"
25#include "clang/AST/ExternalASTSource.h"
26#include "clang/AST/LocInfoType.h"
27#include "clang/AST/MangleNumberingContext.h"
28#include "clang/AST/NSAPI.h"
29#include "clang/AST/PrettyPrinter.h"
30#include "clang/AST/StmtCXX.h"
31#include "clang/AST/TypeLoc.h"
32#include "clang/AST/TypeOrdering.h"
33#include "clang/Basic/ExpressionTraits.h"
34#include "clang/Basic/Module.h"
35#include "clang/Basic/OpenMPKinds.h"
36#include "clang/Basic/PragmaKinds.h"
37#include "clang/Basic/Specifiers.h"
38#include "clang/Basic/TemplateKinds.h"
39#include "clang/Basic/TypeTraits.h"
40#include "clang/Sema/AnalysisBasedWarnings.h"
41#include "clang/Sema/CleanupInfo.h"
42#include "clang/Sema/DeclSpec.h"
43#include "clang/Sema/ExternalSemaSource.h"
44#include "clang/Sema/IdentifierResolver.h"
45#include "clang/Sema/ObjCMethodList.h"
46#include "clang/Sema/Ownership.h"
47#include "clang/Sema/Scope.h"
48#include "clang/Sema/TypoCorrection.h"
49#include "clang/Sema/Weak.h"
50#include "llvm/ADT/ArrayRef.h"
51#include "llvm/ADT/Optional.h"
52#include "llvm/ADT/SetVector.h"
53#include "llvm/ADT/SmallBitVector.h"
54#include "llvm/ADT/SmallPtrSet.h"
55#include "llvm/ADT/SmallVector.h"
56#include "llvm/ADT/TinyPtrVector.h"
57#include <deque>
58#include <memory>
59#include <string>
60#include <vector>

62namespace llvm {
class APSInt;
template <typename ValueT> struct DenseMapInfo;
template <typename ValueT, typename ValueInfoT> class DenseSet;
class SmallBitVector;
struct InlineAsmIdentifierInfo;
68}

70namespace clang {
class ADLResult;
class ASTConsumer;
class ASTContext;
class ASTMutationListener;
class ASTReader;
class ASTWriter;
class ArrayType;
class ParsedAttr;
class BindingDecl;
class BlockDecl;
class CapturedDecl;
class CXXBasePath;
class CXXBasePaths;
class CXXBindTemporaryExpr;
typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
class CXXConstructorDecl;
class CXXConversionDecl;
class CXXDeleteExpr;
class CXXDestructorDecl;
class CXXFieldCollector;
class CXXMemberCallExpr;
class CXXMethodDecl;
class CXXScopeSpec;
class CXXTemporary;
class CXXTryStmt;
class CallExpr;
class ClassTemplateDecl;
class ClassTemplatePartialSpecializationDecl;
class ClassTemplateSpecializationDecl;
class VarTemplatePartialSpecializationDecl;
class CodeCompleteConsumer;
class CodeCompletionAllocator;
class CodeCompletionTUInfo;
class CodeCompletionResult;
class CoroutineBodyStmt;
class Decl;
class DeclAccessPair;
class DeclContext;
class DeclRefExpr;
class DeclaratorDecl;
class DeducedTemplateArgument;
class DependentDiagnostic;
class DesignatedInitExpr;
class Designation;
class EnableIfAttr;
class EnumConstantDecl;
class Expr;
class ExtVectorType;
class FormatAttr;
class FriendDecl;
class FunctionDecl;
class FunctionProtoType;
class FunctionTemplateDecl;
class ImplicitConversionSequence;
typedef MutableArrayRef<ImplicitConversionSequence> ConversionSequenceList;
class InitListExpr;
class InitializationKind;
class InitializationSequence;
class InitializedEntity;
class IntegerLiteral;
class LabelStmt;
class LambdaExpr;
class LangOptions;
class LocalInstantiationScope;
class LookupResult;
class MacroInfo;
typedef ArrayRef<std::pair<IdentifierInfo *, SourceLocation>> ModuleIdPath;
class ModuleLoader;
class MultiLevelTemplateArgumentList;
class NamedDecl;
class ObjCCategoryDecl;
class ObjCCategoryImplDecl;
class ObjCCompatibleAliasDecl;
class ObjCContainerDecl;
class ObjCImplDecl;
class ObjCImplementationDecl;
class ObjCInterfaceDecl;
class ObjCIvarDecl;
template <class T> class ObjCList;
class ObjCMessageExpr;
class ObjCMethodDecl;
class ObjCPropertyDecl;
class ObjCProtocolDecl;
class OMPThreadPrivateDecl;
class OMPRequiresDecl;
class OMPDeclareReductionDecl;
class OMPDeclareSimdDecl;
class OMPClause;
struct OMPVarListLocTy;
struct OverloadCandidate;
class OverloadCandidateSet;
class OverloadExpr;
class ParenListExpr;
class ParmVarDecl;
class Preprocessor;
class PseudoDestructorTypeStorage;
class PseudoObjectExpr;
class QualType;
class StandardConversionSequence;
class Stmt;
class StringLiteral;
class SwitchStmt;
class TemplateArgument;
class TemplateArgumentList;
class TemplateArgumentLoc;
class TemplateDecl;
class TemplateInstantiationCallback;
class TemplateParameterList;
class TemplatePartialOrderingContext;
class TemplateTemplateParmDecl;
class Token;
class TypeAliasDecl;
class TypedefDecl;
class TypedefNameDecl;
class TypeLoc;
class TypoCorrectionConsumer;
class UnqualifiedId;
class UnresolvedLookupExpr;
class UnresolvedMemberExpr;
class UnresolvedSetImpl;
class UnresolvedSetIterator;
class UsingDecl;
class UsingShadowDecl;
class ValueDecl;
class VarDecl;
class VarTemplateSpecializationDecl;
class VisibilityAttr;
class VisibleDeclConsumer;
class IndirectFieldDecl;
struct DeductionFailureInfo;
class TemplateSpecCandidateSet;

203namespace sema {
class AccessedEntity;
class BlockScopeInfo;
class Capture;
class CapturedRegionScopeInfo;
class CapturingScopeInfo;
class CompoundScopeInfo;
class DelayedDiagnostic;
class DelayedDiagnosticPool;
class FunctionScopeInfo;
class LambdaScopeInfo;
class PossiblyUnreachableDiag;
class SemaPPCallbacks;
class TemplateDeductionInfo;
217}

219namespace threadSafety {
class BeforeSet;
void threadSafetyCleanup(BeforeSet* Cache);
222}

224// FIXME: No way to easily map from TemplateTypeParmTypes to
225// TemplateTypeParmDecls, so we have this horrible PointerUnion.
226typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType*, NamedDecl*>,
                SourceLocation> UnexpandedParameterPack;

229/// Describes whether we've seen any nullability information for the given
230/// file.
231struct FileNullability {
/// The first pointer declarator (of any pointer kind) in the file that does
/// not have a corresponding nullability annotation.
SourceLocation PointerLoc;

/// The end location for the first pointer declarator in the file. Used for
/// placing fix-its.
SourceLocation PointerEndLoc;

/// Which kind of pointer declarator we saw.
uint8_t PointerKind;

/// Whether we saw any type nullability annotations in the given file.
bool SawTypeNullability = false;
245};

247/// A mapping from file IDs to a record of whether we've seen nullability
248/// information in that file.
249class FileNullabilityMap {
/// A mapping from file IDs to the nullability information for each file ID.
llvm::DenseMap<FileID, FileNullability> Map;

/// A single-element cache based on the file ID.
struct {
  FileID File;
  FileNullability Nullability;
} Cache;

259public:
FileNullability &operator[](FileID file) {
  // Check the single-element cache.
  if (file == Cache.File)
    return Cache.Nullability;

  // It's not in the single-element cache; flush the cache if we have one.
  if (!Cache.File.isInvalid()) {
    Map[Cache.File] = Cache.Nullability;
  }

  // Pull this entry into the cache.
  Cache.File = file;
  Cache.Nullability = Map[file];
  return Cache.Nullability;
}
275};

277/// Keeps track of expected type during expression parsing. The type is tied to
278/// a particular token, all functions that update or consume the type take a
279/// start location of the token they are looking at as a parameter. This allows
280/// to avoid updating the type on hot paths in the parser.
281class PreferredTypeBuilder {
282public:
PreferredTypeBuilder() = default;
explicit PreferredTypeBuilder(QualType Type) : Type(Type) {}

void enterCondition(Sema &S, SourceLocation Tok);
void enterReturn(Sema &S, SourceLocation Tok);
void enterVariableInit(SourceLocation Tok, Decl *D);
/// Computing a type for the function argument may require running
/// overloading, so we postpone its computation until it is actually needed.
///
/// Clients should be very careful when using this funciton, as it stores a
/// function_ref, clients should make sure all calls to get() with the same
/// location happen while function_ref is alive.
void enterFunctionArgument(SourceLocation Tok,
                           llvm::function_ref<QualType()> ComputeType);

void enterParenExpr(SourceLocation Tok, SourceLocation LParLoc);
void enterUnary(Sema &S, SourceLocation Tok, tok::TokenKind OpKind,
                SourceLocation OpLoc);
void enterBinary(Sema &S, SourceLocation Tok, Expr *LHS, tok::TokenKind Op);
void enterMemAccess(Sema &S, SourceLocation Tok, Expr *Base);
void enterSubscript(Sema &S, SourceLocation Tok, Expr *LHS);
/// Handles all type casts, including C-style cast, C++ casts, etc.
void enterTypeCast(SourceLocation Tok, QualType CastType);

QualType get(SourceLocation Tok) const {
  if (Tok != ExpectedLoc)
    return QualType();
  if (!Type.isNull())
    return Type;
  if (ComputeType)
    return ComputeType();
  return QualType();
}

317private:
/// Start position of a token for which we store expected type.
SourceLocation ExpectedLoc;
/// Expected type for a token starting at ExpectedLoc.
QualType Type;
/// A function to compute expected type at ExpectedLoc. It is only considered
/// if Type is null.
llvm::function_ref<QualType()> ComputeType;
325};

327/// Sema - This implements semantic analysis and AST building for C.
328class Sema {
Sema(const Sema &) = delete;
void operator=(const Sema &) = delete;

///Source of additional semantic information.
ExternalSemaSource *ExternalSource;

///Whether Sema has generated a multiplexer and has to delete it.
bool isMultiplexExternalSource;

static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);

bool isVisibleSlow(const NamedDecl *D);

/// Determine whether two declarations should be linked together, given that
/// the old declaration might not be visible and the new declaration might
/// not have external linkage.
bool shouldLinkPossiblyHiddenDecl(const NamedDecl *Old,
                                  const NamedDecl *New) {
  if (isVisible(Old))
   return true;
  // See comment in below overload for why it's safe to compute the linkage
  // of the new declaration here.
  if (New->isExternallyDeclarable()) {
    assert(Old->isExternallyDeclarable() &&((Old->isExternallyDeclarable() && "should not have found a non-externally-declarable previous decl"
) ? static_cast<void> (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 353, __PRETTY_FUNCTION__))
           "should not have found a non-externally-declarable previous decl")((Old->isExternallyDeclarable() && "should not have found a non-externally-declarable previous decl"
) ? static_cast<void> (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 353, __PRETTY_FUNCTION__));
    return true;
  }
  return false;
}
bool shouldLinkPossiblyHiddenDecl(LookupResult &Old, const NamedDecl *New);

void setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem,
                                    QualType ResultTy,
                                    ArrayRef<QualType> Args);

364public:
typedef OpaquePtr<DeclGroupRef> DeclGroupPtrTy;
typedef OpaquePtr<TemplateName> TemplateTy;
typedef OpaquePtr<QualType> TypeTy;

OpenCLOptions OpenCLFeatures;
FPOptions FPFeatures;

const LangOptions &LangOpts;
Preprocessor &PP;
ASTContext &Context;
ASTConsumer &Consumer;
DiagnosticsEngine &Diags;
SourceManager &SourceMgr;

/// Flag indicating whether or not to collect detailed statistics.
bool CollectStats;

/// Code-completion consumer.
CodeCompleteConsumer *CodeCompleter;

/// CurContext - This is the current declaration context of parsing.
DeclContext *CurContext;

/// Generally null except when we temporarily switch decl contexts,
/// like in \see ActOnObjCTemporaryExitContainerContext.
DeclContext *OriginalLexicalContext;

/// VAListTagName - The declaration name corresponding to __va_list_tag.
/// This is used as part of a hack to omit that class from ADL results.
DeclarationName VAListTagName;

bool MSStructPragmaOn; // True when \#pragma ms_struct on

/// Controls member pointer representation format under the MS ABI.
LangOptions::PragmaMSPointersToMembersKind
    MSPointerToMemberRepresentationMethod;

/// Stack of active SEH __finally scopes.  Can be empty.
SmallVector<Scope*, 2> CurrentSEHFinally;

/// Source location for newly created implicit MSInheritanceAttrs
SourceLocation ImplicitMSInheritanceAttrLoc;

/// pragma clang section kind
enum PragmaClangSectionKind {
  PCSK_Invalid      = 0,
  PCSK_BSS          = 1,
  PCSK_Data         = 2,
  PCSK_Rodata       = 3,
  PCSK_Text         = 4
 };

enum PragmaClangSectionAction {
  PCSA_Set     = 0,
  PCSA_Clear   = 1
};

struct PragmaClangSection {
  std::string SectionName;
  bool Valid = false;
  SourceLocation PragmaLocation;

  void Act(SourceLocation PragmaLocation,
           PragmaClangSectionAction Action,
           StringLiteral* Name);
 };

 PragmaClangSection PragmaClangBSSSection;
 PragmaClangSection PragmaClangDataSection;
 PragmaClangSection PragmaClangRodataSection;
 PragmaClangSection PragmaClangTextSection;

enum PragmaMsStackAction {
  PSK_Reset     = 0x0,                // #pragma ()
  PSK_Set       = 0x1,                // #pragma (value)
  PSK_Push      = 0x2,                // #pragma (push[, id])
  PSK_Pop       = 0x4,                // #pragma (pop[, id])
  PSK_Show      = 0x8,                // #pragma (show) -- only for "pack"!
  PSK_Push_Set  = PSK_Push | PSK_Set, // #pragma (push[, id], value)
  PSK_Pop_Set   = PSK_Pop | PSK_Set,  // #pragma (pop[, id], value)
};

template<typename ValueType>
struct PragmaStack {
  struct Slot {
    llvm::StringRef StackSlotLabel;
    ValueType Value;
    SourceLocation PragmaLocation;
    SourceLocation PragmaPushLocation;
    Slot(llvm::StringRef StackSlotLabel, ValueType Value,
         SourceLocation PragmaLocation, SourceLocation PragmaPushLocation)
        : StackSlotLabel(StackSlotLabel), Value(Value),
          PragmaLocation(PragmaLocation),
          PragmaPushLocation(PragmaPushLocation) {}
  };
  void Act(SourceLocation PragmaLocation,
           PragmaMsStackAction Action,
           llvm::StringRef StackSlotLabel,
           ValueType Value);

  // MSVC seems to add artificial slots to #pragma stacks on entering a C++
  // method body to restore the stacks on exit, so it works like this:
  //
  //   struct S {
  //     #pragma <name>(push, InternalPragmaSlot, <current_pragma_value>)
  //     void Method {}
  //     #pragma <name>(pop, InternalPragmaSlot)
  //   };
  //
  // It works even with #pragma vtordisp, although MSVC doesn't support
  //   #pragma vtordisp(push [, id], n)
  // syntax.
  //
  // Push / pop a named sentinel slot.
  void SentinelAction(PragmaMsStackAction Action, StringRef Label) {
    assert((Action == PSK_Push || Action == PSK_Pop) &&(((Action == PSK_Push || Action == PSK_Pop) && "Can only push / pop #pragma stack sentinels!"
) ? static_cast<void> (0) : __assert_fail ("(Action == PSK_Push || Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 481, __PRETTY_FUNCTION__))
           "Can only push / pop #pragma stack sentinels!")(((Action == PSK_Push || Action == PSK_Pop) && "Can only push / pop #pragma stack sentinels!"
) ? static_cast<void> (0) : __assert_fail ("(Action == PSK_Push || Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 481, __PRETTY_FUNCTION__));
    Act(CurrentPragmaLocation, Action, Label, CurrentValue);
  }

  // Constructors.
  explicit PragmaStack(const ValueType &Default)
      : DefaultValue(Default), CurrentValue(Default) {}

  bool hasValue() const { return CurrentValue != DefaultValue; }

  SmallVector<Slot, 2> Stack;
  ValueType DefaultValue; // Value used for PSK_Reset action.
  ValueType CurrentValue;
  SourceLocation CurrentPragmaLocation;
};
// FIXME: We should serialize / deserialize these if they occur in a PCH (but
// we shouldn't do so if they're in a module).

/// Whether to insert vtordisps prior to virtual bases in the Microsoft
/// C++ ABI.  Possible values are 0, 1, and 2, which mean:
///
/// 0: Suppress all vtordisps
/// 1: Insert vtordisps in the presence of vbase overrides and non-trivial
///    structors
/// 2: Always insert vtordisps to support RTTI on partially constructed
///    objects
PragmaStack<MSVtorDispAttr::Mode> VtorDispStack;
// #pragma pack.
// Sentinel to represent when the stack is set to mac68k alignment.
static const unsigned kMac68kAlignmentSentinel = ~0U;
PragmaStack<unsigned> PackStack;
// The current #pragma pack values and locations at each #include.
struct PackIncludeState {
  unsigned CurrentValue;
  SourceLocation CurrentPragmaLocation;
  bool HasNonDefaultValue, ShouldWarnOnInclude;
};
SmallVector<PackIncludeState, 8> PackIncludeStack;
// Segment #pragmas.
PragmaStack<StringLiteral *> DataSegStack;
PragmaStack<StringLiteral *> BSSSegStack;
PragmaStack<StringLiteral *> ConstSegStack;
PragmaStack<StringLiteral *> CodeSegStack;

// RAII object to push / pop sentinel slots for all MS #pragma stacks.
// Actions should be performed only if we enter / exit a C++ method body.
class PragmaStackSentinelRAII {
public:
  PragmaStackSentinelRAII(Sema &S, StringRef SlotLabel, bool ShouldAct);
  ~PragmaStackSentinelRAII();

private:
  Sema &S;
  StringRef SlotLabel;
  bool ShouldAct;
};

/// A mapping that describes the nullability we've seen in each header file.
FileNullabilityMap NullabilityMap;

/// Last section used with #pragma init_seg.
StringLiteral *CurInitSeg;
SourceLocation CurInitSegLoc;

/// VisContext - Manages the stack for \#pragma GCC visibility.
void *VisContext; // Really a "PragmaVisStack*"

/// This an attribute introduced by \#pragma clang attribute.
struct PragmaAttributeEntry {
  SourceLocation Loc;
  ParsedAttr *Attribute;
  SmallVector<attr::SubjectMatchRule, 4> MatchRules;
  bool IsUsed;
};

/// A push'd group of PragmaAttributeEntries.
struct PragmaAttributeGroup {
  /// The location of the push attribute.
  SourceLocation Loc;
  /// The namespace of this push group.
  const IdentifierInfo *Namespace;
  SmallVector<PragmaAttributeEntry, 2> Entries;
};

SmallVector<PragmaAttributeGroup, 2> PragmaAttributeStack;

/// The declaration that is currently receiving an attribute from the
/// #pragma attribute stack.
const Decl *PragmaAttributeCurrentTargetDecl;

/// This represents the last location of a "#pragma clang optimize off"
/// directive if such a directive has not been closed by an "on" yet. If
/// optimizations are currently "on", this is set to an invalid location.
SourceLocation OptimizeOffPragmaLocation;

/// Flag indicating if Sema is building a recovery call expression.
///
/// This flag is used to avoid building recovery call expressions
/// if Sema is already doing so, which would cause infinite recursions.
bool IsBuildingRecoveryCallExpr;

/// Used to control the generation of ExprWithCleanups.
CleanupInfo Cleanup;

/// ExprCleanupObjects - This is the stack of objects requiring
/// cleanup that are created by the current full expression.  The
/// element type here is ExprWithCleanups::Object.
SmallVector<BlockDecl*, 8> ExprCleanupObjects;

/// Store a set of either DeclRefExprs or MemberExprs that contain a reference
/// to a variable (constant) that may or may not be odr-used in this Expr, and
/// we won't know until all lvalue-to-rvalue and discarded value conversions
/// have been applied to all subexpressions of the enclosing full expression.
/// This is cleared at the end of each full expression.
using MaybeODRUseExprSet = llvm::SmallPtrSet<Expr *, 2>;
MaybeODRUseExprSet MaybeODRUseExprs;

std::unique_ptr<sema::FunctionScopeInfo> PreallocatedFunctionScope;

/// Stack containing information about each of the nested
/// function, block, and method scopes that are currently active.
SmallVector<sema::FunctionScopeInfo *, 4> FunctionScopes;

typedef LazyVector<TypedefNameDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadExtVectorDecls, 2, 2>
  ExtVectorDeclsType;

/// ExtVectorDecls - This is a list all the extended vector types. This allows
/// us to associate a raw vector type with one of the ext_vector type names.
/// This is only necessary for issuing pretty diagnostics.
ExtVectorDeclsType ExtVectorDecls;

/// FieldCollector - Collects CXXFieldDecls during parsing of C++ classes.
std::unique_ptr<CXXFieldCollector> FieldCollector;

typedef llvm::SmallSetVector<NamedDecl *, 16> NamedDeclSetType;

/// Set containing all declared private fields that are not used.
NamedDeclSetType UnusedPrivateFields;

/// Set containing all typedefs that are likely unused.
llvm::SmallSetVector<const TypedefNameDecl *, 4>
    UnusedLocalTypedefNameCandidates;

/// Delete-expressions to be analyzed at the end of translation unit
///
/// This list contains class members, and locations of delete-expressions
/// that could not be proven as to whether they mismatch with new-expression
/// used in initializer of the field.
typedef std::pair<SourceLocation, bool> DeleteExprLoc;
typedef llvm::SmallVector<DeleteExprLoc, 4> DeleteLocs;
llvm::MapVector<FieldDecl *, DeleteLocs> DeleteExprs;

typedef llvm::SmallPtrSet<const CXXRecordDecl*, 8> RecordDeclSetTy;

/// PureVirtualClassDiagSet - a set of class declarations which we have
/// emitted a list of pure virtual functions. Used to prevent emitting the
/// same list more than once.
std::unique_ptr<RecordDeclSetTy> PureVirtualClassDiagSet;

/// ParsingInitForAutoVars - a set of declarations with auto types for which
/// we are currently parsing the initializer.
llvm::SmallPtrSet<const Decl*, 4> ParsingInitForAutoVars;

/// Look for a locally scoped extern "C" declaration by the given name.
NamedDecl *findLocallyScopedExternCDecl(DeclarationName Name);

typedef LazyVector<VarDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadTentativeDefinitions, 2, 2>
  TentativeDefinitionsType;

/// All the tentative definitions encountered in the TU.
TentativeDefinitionsType TentativeDefinitions;

typedef LazyVector<const DeclaratorDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadUnusedFileScopedDecls, 2, 2>
  UnusedFileScopedDeclsType;

/// The set of file scoped decls seen so far that have not been used
/// and must warn if not used. Only contains the first declaration.
UnusedFileScopedDeclsType UnusedFileScopedDecls;

typedef LazyVector<CXXConstructorDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadDelegatingConstructors, 2, 2>
  DelegatingCtorDeclsType;

/// All the delegating constructors seen so far in the file, used for
/// cycle detection at the end of the TU.
DelegatingCtorDeclsType DelegatingCtorDecls;

/// All the overriding functions seen during a class definition
/// that had their exception spec checks delayed, plus the overridden
/// function.
SmallVector<std::pair<const CXXMethodDecl*, const CXXMethodDecl*>, 2>
  DelayedOverridingExceptionSpecChecks;

/// All the function redeclarations seen during a class definition that had
/// their exception spec checks delayed, plus the prior declaration they
/// should be checked against. Except during error recovery, the new decl
/// should always be a friend declaration, as that's the only valid way to
/// redeclare a special member before its class is complete.
SmallVector<std::pair<FunctionDecl*, FunctionDecl*>, 2>
  DelayedEquivalentExceptionSpecChecks;

typedef llvm::MapVector<const FunctionDecl *,
                        std::unique_ptr<LateParsedTemplate>>
    LateParsedTemplateMapT;
LateParsedTemplateMapT LateParsedTemplateMap;

/// Callback to the parser to parse templated functions when needed.
typedef void LateTemplateParserCB(void *P, LateParsedTemplate &LPT);
typedef void LateTemplateParserCleanupCB(void *P);
LateTemplateParserCB *LateTemplateParser;
LateTemplateParserCleanupCB *LateTemplateParserCleanup;
void *OpaqueParser;

void SetLateTemplateParser(LateTemplateParserCB *LTP,
                           LateTemplateParserCleanupCB *LTPCleanup,
                           void *P) {
  LateTemplateParser = LTP;
  LateTemplateParserCleanup = LTPCleanup;
  OpaqueParser = P;
}

class DelayedDiagnostics;

class DelayedDiagnosticsState {
  sema::DelayedDiagnosticPool *SavedPool;
  friend class Sema::DelayedDiagnostics;
};
typedef DelayedDiagnosticsState ParsingDeclState;
typedef DelayedDiagnosticsState ProcessingContextState;

/// A class which encapsulates the logic for delaying diagnostics
/// during parsing and other processing.
class DelayedDiagnostics {
  /// The current pool of diagnostics into which delayed
  /// diagnostics should go.
  sema::DelayedDiagnosticPool *CurPool;

public:
  DelayedDiagnostics() : CurPool(nullptr) {}

  /// Adds a delayed diagnostic.
  void add(const sema::DelayedDiagnostic &diag); // in DelayedDiagnostic.h

  /// Determines whether diagnostics should be delayed.
  bool shouldDelayDiagnostics() { return CurPool != nullptr; }

  /// Returns the current delayed-diagnostics pool.
  sema::DelayedDiagnosticPool *getCurrentPool() const {
    return CurPool;
  }

  /// Enter a new scope.  Access and deprecation diagnostics will be
  /// collected in this pool.
  DelayedDiagnosticsState push(sema::DelayedDiagnosticPool &pool) {
    DelayedDiagnosticsState state;
    state.SavedPool = CurPool;
    CurPool = &pool;
    return state;
  }

  /// Leave a delayed-diagnostic state that was previously pushed.
  /// Do not emit any of the diagnostics.  This is performed as part
  /// of the bookkeeping of popping a pool "properly".
  void popWithoutEmitting(DelayedDiagnosticsState state) {
    CurPool = state.SavedPool;
  }

  /// Enter a new scope where access and deprecation diagnostics are
  /// not delayed.
  DelayedDiagnosticsState pushUndelayed() {
    DelayedDiagnosticsState state;
    state.SavedPool = CurPool;
    CurPool = nullptr;
    return state;
  }

  /// Undo a previous pushUndelayed().
  void popUndelayed(DelayedDiagnosticsState state) {
    assert(CurPool == nullptr)((CurPool == nullptr) ? static_cast<void> (0) : __assert_fail
 ("CurPool == nullptr", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 762, __PRETTY_FUNCTION__));
    CurPool = state.SavedPool;
  }
} DelayedDiagnostics;

/// A RAII object to temporarily push a declaration context.
class ContextRAII {
private:
  Sema &S;
  DeclContext *SavedContext;
  ProcessingContextState SavedContextState;
  QualType SavedCXXThisTypeOverride;

public:
  ContextRAII(Sema &S, DeclContext *ContextToPush, bool NewThisContext = true)
    : S(S), SavedContext(S.CurContext),
      SavedContextState(S.DelayedDiagnostics.pushUndelayed()),
      SavedCXXThisTypeOverride(S.CXXThisTypeOverride)
  {
    assert(ContextToPush && "pushing null context")((ContextToPush && "pushing null context") ? static_cast
<void> (0) : __assert_fail ("ContextToPush && \"pushing null context\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 781, __PRETTY_FUNCTION__));
    S.CurContext = ContextToPush;
    if (NewThisContext)
      S.CXXThisTypeOverride = QualType();
  }

  void pop() {
    if (!SavedContext) return;
    S.CurContext = SavedContext;
    S.DelayedDiagnostics.popUndelayed(SavedContextState);
    S.CXXThisTypeOverride = SavedCXXThisTypeOverride;
    SavedContext = nullptr;
  }

  ~ContextRAII() {
    pop();
  }
};

/// RAII object to handle the state changes required to synthesize
/// a function body.
class SynthesizedFunctionScope {
  Sema &S;
  Sema::ContextRAII SavedContext;
  bool PushedCodeSynthesisContext = false;

public:
  SynthesizedFunctionScope(Sema &S, DeclContext *DC)
      : S(S), SavedContext(S, DC) {
    S.PushFunctionScope();
    S.PushExpressionEvaluationContext(
        Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
    if (auto *FD = dyn_cast<FunctionDecl>(DC))
      FD->setWillHaveBody(true);
    else
      assert(isa<ObjCMethodDecl>(DC))((isa<ObjCMethodDecl>(DC)) ? static_cast<void> (0
) : __assert_fail ("isa<ObjCMethodDecl>(DC)", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 816, __PRETTY_FUNCTION__));
  }

  void addContextNote(SourceLocation UseLoc) {
    assert(!PushedCodeSynthesisContext)((!PushedCodeSynthesisContext) ? static_cast<void> (0) :
 __assert_fail ("!PushedCodeSynthesisContext", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 820, __PRETTY_FUNCTION__));
9
←
'?' condition is true→

    Sema::CodeSynthesisContext Ctx;
    Ctx.Kind = Sema::CodeSynthesisContext::DefiningSynthesizedFunction;
    Ctx.PointOfInstantiation = UseLoc;
    Ctx.Entity = cast<Decl>(S.CurContext);
    S.pushCodeSynthesisContext(Ctx);
10
←
Passed-by-value struct argument contains uninitialized data (e.g., field: 'SavedInNonInstantiationSFINAEContext')

    PushedCodeSynthesisContext = true;
  }

  ~SynthesizedFunctionScope() {
    if (PushedCodeSynthesisContext)
      S.popCodeSynthesisContext();
    if (auto *FD = dyn_cast<FunctionDecl>(S.CurContext))
      FD->setWillHaveBody(false);
    S.PopExpressionEvaluationContext();
    S.PopFunctionScopeInfo();
  }
};

/// WeakUndeclaredIdentifiers - Identifiers contained in
/// \#pragma weak before declared. rare. may alias another
/// identifier, declared or undeclared
llvm::MapVector<IdentifierInfo *, WeakInfo> WeakUndeclaredIdentifiers;

/// ExtnameUndeclaredIdentifiers - Identifiers contained in
/// \#pragma redefine_extname before declared.  Used in Solaris system headers
/// to define functions that occur in multiple standards to call the version
/// in the currently selected standard.
llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*> ExtnameUndeclaredIdentifiers;


/// Load weak undeclared identifiers from the external source.
void LoadExternalWeakUndeclaredIdentifiers();

/// WeakTopLevelDecl - Translation-unit scoped declarations generated by
/// \#pragma weak during processing of other Decls.
/// I couldn't figure out a clean way to generate these in-line, so
/// we store them here and handle separately -- which is a hack.
/// It would be best to refactor this.
SmallVector<Decl*,2> WeakTopLevelDecl;

IdentifierResolver IdResolver;

/// Translation Unit Scope - useful to Objective-C actions that need
/// to lookup file scope declarations in the "ordinary" C decl namespace.
/// For example, user-defined classes, built-in "id" type, etc.
Scope *TUScope;

/// The C++ "std" namespace, where the standard library resides.
LazyDeclPtr StdNamespace;

/// The C++ "std::bad_alloc" class, which is defined by the C++
/// standard library.
LazyDeclPtr StdBadAlloc;

/// The C++ "std::align_val_t" enum class, which is defined by the C++
/// standard library.
LazyDeclPtr StdAlignValT;

/// The C++ "std::experimental" namespace, where the experimental parts
/// of the standard library resides.
NamespaceDecl *StdExperimentalNamespaceCache;

/// The C++ "std::initializer_list" template, which is defined in
/// \<initializer_list>.
ClassTemplateDecl *StdInitializerList;

/// The C++ "std::coroutine_traits" template, which is defined in
/// \<coroutine_traits>
ClassTemplateDecl *StdCoroutineTraitsCache;

/// The C++ "type_info" declaration, which is defined in \<typeinfo>.
RecordDecl *CXXTypeInfoDecl;

/// The MSVC "_GUID" struct, which is defined in MSVC header files.
RecordDecl *MSVCGuidDecl;

/// Caches identifiers/selectors for NSFoundation APIs.
std::unique_ptr<NSAPI> NSAPIObj;

/// The declaration of the Objective-C NSNumber class.
ObjCInterfaceDecl *NSNumberDecl;

/// The declaration of the Objective-C NSValue class.
ObjCInterfaceDecl *NSValueDecl;

/// Pointer to NSNumber type (NSNumber *).
QualType NSNumberPointer;

/// Pointer to NSValue type (NSValue *).
QualType NSValuePointer;

/// The Objective-C NSNumber methods used to create NSNumber literals.
ObjCMethodDecl *NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods];

/// The declaration of the Objective-C NSString class.
ObjCInterfaceDecl *NSStringDecl;

/// Pointer to NSString type (NSString *).
QualType NSStringPointer;

/// The declaration of the stringWithUTF8String: method.
ObjCMethodDecl *StringWithUTF8StringMethod;

/// The declaration of the valueWithBytes:objCType: method.
ObjCMethodDecl *ValueWithBytesObjCTypeMethod;

/// The declaration of the Objective-C NSArray class.
ObjCInterfaceDecl *NSArrayDecl;

/// The declaration of the arrayWithObjects:count: method.
ObjCMethodDecl *ArrayWithObjectsMethod;

/// The declaration of the Objective-C NSDictionary class.
ObjCInterfaceDecl *NSDictionaryDecl;

/// The declaration of the dictionaryWithObjects:forKeys:count: method.
ObjCMethodDecl *DictionaryWithObjectsMethod;

/// id<NSCopying> type.
QualType QIDNSCopying;

/// will hold 'respondsToSelector:'
Selector RespondsToSelectorSel;

/// A flag to remember whether the implicit forms of operator new and delete
/// have been declared.
bool GlobalNewDeleteDeclared;

/// A flag to indicate that we're in a context that permits abstract
/// references to fields.  This is really a
bool AllowAbstractFieldReference;

/// Describes how the expressions currently being parsed are
/// evaluated at run-time, if at all.
enum class ExpressionEvaluationContext {
  /// The current expression and its subexpressions occur within an
  /// unevaluated operand (C++11 [expr]p7), such as the subexpression of
  /// \c sizeof, where the type of the expression may be significant but
  /// no code will be generated to evaluate the value of the expression at
  /// run time.
  Unevaluated,

  /// The current expression occurs within a braced-init-list within
  /// an unevaluated operand. This is mostly like a regular unevaluated
  /// context, except that we still instantiate constexpr functions that are
  /// referenced here so that we can perform narrowing checks correctly.
  UnevaluatedList,

  /// The current expression occurs within a discarded statement.
  /// This behaves largely similarly to an unevaluated operand in preventing
  /// definitions from being required, but not in other ways.
  DiscardedStatement,

  /// The current expression occurs within an unevaluated
  /// operand that unconditionally permits abstract references to
  /// fields, such as a SIZE operator in MS-style inline assembly.
  UnevaluatedAbstract,

  /// The current context is "potentially evaluated" in C++11 terms,
  /// but the expression is evaluated at compile-time (like the values of
  /// cases in a switch statement).
  ConstantEvaluated,

  /// The current expression is potentially evaluated at run time,
  /// which means that code may be generated to evaluate the value of the
  /// expression at run time.
  PotentiallyEvaluated,

  /// The current expression is potentially evaluated, but any
  /// declarations referenced inside that expression are only used if
  /// in fact the current expression is used.
  ///
  /// This value is used when parsing default function arguments, for which
  /// we would like to provide diagnostics (e.g., passing non-POD arguments
  /// through varargs) but do not want to mark declarations as "referenced"
  /// until the default argument is used.
  PotentiallyEvaluatedIfUsed
};

/// Data structure used to record current or nested
/// expression evaluation contexts.
struct ExpressionEvaluationContextRecord {
  /// The expression evaluation context.
  ExpressionEvaluationContext Context;

  /// Whether the enclosing context needed a cleanup.
  CleanupInfo ParentCleanup;

  /// Whether we are in a decltype expression.
  bool IsDecltype;

  /// The number of active cleanup objects when we entered
  /// this expression evaluation context.
  unsigned NumCleanupObjects;

  /// The number of typos encountered during this expression evaluation
  /// context (i.e. the number of TypoExprs created).
  unsigned NumTypos;

  MaybeODRUseExprSet SavedMaybeODRUseExprs;

  /// The lambdas that are present within this context, if it
  /// is indeed an unevaluated context.
  SmallVector<LambdaExpr *, 2> Lambdas;

  /// The declaration that provides context for lambda expressions
  /// and block literals if the normal declaration context does not
  /// suffice, e.g., in a default function argument.
  Decl *ManglingContextDecl;

  /// The context information used to mangle lambda expressions
  /// and block literals within this context.
  ///
  /// This mangling information is allocated lazily, since most contexts
  /// do not have lambda expressions or block literals.
  std::unique_ptr<MangleNumberingContext> MangleNumbering;

  /// If we are processing a decltype type, a set of call expressions
  /// for which we have deferred checking the completeness of the return type.
  SmallVector<CallExpr *, 8> DelayedDecltypeCalls;

  /// If we are processing a decltype type, a set of temporary binding
  /// expressions for which we have deferred checking the destructor.
  SmallVector<CXXBindTemporaryExpr *, 8> DelayedDecltypeBinds;

  llvm::SmallPtrSet<const Expr *, 8> PossibleDerefs;

  /// \brief Describes whether we are in an expression constext which we have
  /// to handle differently.
  enum ExpressionKind {
    EK_Decltype, EK_TemplateArgument, EK_Other
  } ExprContext;

  ExpressionEvaluationContextRecord(ExpressionEvaluationContext Context,
                                    unsigned NumCleanupObjects,
                                    CleanupInfo ParentCleanup,
                                    Decl *ManglingContextDecl,
                                    ExpressionKind ExprContext)
      : Context(Context), ParentCleanup(ParentCleanup),
        NumCleanupObjects(NumCleanupObjects), NumTypos(0),
        ManglingContextDecl(ManglingContextDecl), MangleNumbering(),
        ExprContext(ExprContext) {}

  /// Retrieve the mangling numbering context, used to consistently
  /// number constructs like lambdas for mangling.
  MangleNumberingContext &getMangleNumberingContext(ASTContext &Ctx);

  bool isUnevaluated() const {
    return Context == ExpressionEvaluationContext::Unevaluated ||
           Context == ExpressionEvaluationContext::UnevaluatedAbstract ||
           Context == ExpressionEvaluationContext::UnevaluatedList;
  }
  bool isConstantEvaluated() const {
    return Context == ExpressionEvaluationContext::ConstantEvaluated;
  }
};

/// A stack of expression evaluation contexts.
SmallVector<ExpressionEvaluationContextRecord, 8> ExprEvalContexts;

/// Emit a warning for all pending noderef expressions that we recorded.
void WarnOnPendingNoDerefs(ExpressionEvaluationContextRecord &Rec);

/// Compute the mangling number context for a lambda expression or
/// block literal.
///
/// \param DC - The DeclContext containing the lambda expression or
/// block literal.
/// \param[out] ManglingContextDecl - Returns the ManglingContextDecl
/// associated with the context, if relevant.
MangleNumberingContext *getCurrentMangleNumberContext(
  const DeclContext *DC,
  Decl *&ManglingContextDecl);


/// SpecialMemberOverloadResult - The overloading result for a special member
/// function.
///
/// This is basically a wrapper around PointerIntPair. The lowest bits of the
/// integer are used to determine whether overload resolution succeeded.
class SpecialMemberOverloadResult {
public:
  enum Kind {
    NoMemberOrDeleted,
    Ambiguous,
    Success
  };

private:
  llvm::PointerIntPair<CXXMethodDecl*, 2> Pair;

public:
  SpecialMemberOverloadResult() : Pair() {}
  SpecialMemberOverloadResult(CXXMethodDecl *MD)
      : Pair(MD, MD->isDeleted() ? NoMemberOrDeleted : Success) {}

  CXXMethodDecl *getMethod() const { return Pair.getPointer(); }
  void setMethod(CXXMethodDecl *MD) { Pair.setPointer(MD); }

  Kind getKind() const { return static_cast<Kind>(Pair.getInt()); }
  void setKind(Kind K) { Pair.setInt(K); }
};

class SpecialMemberOverloadResultEntry
    : public llvm::FastFoldingSetNode,
      public SpecialMemberOverloadResult {
public:
  SpecialMemberOverloadResultEntry(const llvm::FoldingSetNodeID &ID)
    : FastFoldingSetNode(ID)
  {}
};

/// A cache of special member function overload resolution results
/// for C++ records.
llvm::FoldingSet<SpecialMemberOverloadResultEntry> SpecialMemberCache;

/// A cache of the flags available in enumerations with the flag_bits
/// attribute.
mutable llvm::DenseMap<const EnumDecl*, llvm::APInt> FlagBitsCache;

/// The kind of translation unit we are processing.
///
/// When we're processing a complete translation unit, Sema will perform
/// end-of-translation-unit semantic tasks (such as creating
/// initializers for tentative definitions in C) once parsing has
/// completed. Modules and precompiled headers perform different kinds of
/// checks.
TranslationUnitKind TUKind;

llvm::BumpPtrAllocator BumpAlloc;

/// The number of SFINAE diagnostics that have been trapped.
unsigned NumSFINAEErrors;

typedef llvm::DenseMap<ParmVarDecl *, llvm::TinyPtrVector<ParmVarDecl *>>
  UnparsedDefaultArgInstantiationsMap;

/// A mapping from parameters with unparsed default arguments to the
/// set of instantiations of each parameter.
///
/// This mapping is a temporary data structure used when parsing
/// nested class templates or nested classes of class templates,
/// where we might end up instantiating an inner class before the
/// default arguments of its methods have been parsed.
UnparsedDefaultArgInstantiationsMap UnparsedDefaultArgInstantiations;

// Contains the locations of the beginning of unparsed default
// argument locations.
llvm::DenseMap<ParmVarDecl *, SourceLocation> UnparsedDefaultArgLocs;

/// UndefinedInternals - all the used, undefined objects which require a
/// definition in this translation unit.
llvm::MapVector<NamedDecl *, SourceLocation> UndefinedButUsed;

/// Determine if VD, which must be a variable or function, is an external
/// symbol that nonetheless can't be referenced from outside this translation
/// unit because its type has no linkage and it's not extern "C".
bool isExternalWithNoLinkageType(ValueDecl *VD);

/// Obtain a sorted list of functions that are undefined but ODR-used.
void getUndefinedButUsed(
    SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined);

/// Retrieves list of suspicious delete-expressions that will be checked at
/// the end of translation unit.
const llvm::MapVector<FieldDecl *, DeleteLocs> &
getMismatchingDeleteExpressions() const;

typedef std::pair<ObjCMethodList, ObjCMethodList> GlobalMethods;
typedef llvm::DenseMap<Selector, GlobalMethods> GlobalMethodPool;

/// Method Pool - allows efficient lookup when typechecking messages to "id".
/// We need to maintain a list, since selectors can have differing signatures
/// across classes. In Cocoa, this happens to be extremely uncommon (only 1%
/// of selectors are "overloaded").
/// At the head of the list it is recorded whether there were 0, 1, or >= 2
/// methods inside categories with a particular selector.
GlobalMethodPool MethodPool;

/// Method selectors used in a \@selector expression. Used for implementation
/// of -Wselector.
llvm::MapVector<Selector, SourceLocation> ReferencedSelectors;

/// List of SourceLocations where 'self' is implicitly retained inside a
/// block.
llvm::SmallVector<std::pair<SourceLocation, const BlockDecl *>, 1>
    ImplicitlyRetainedSelfLocs;

/// Kinds of C++ special members.
enum CXXSpecialMember {
  CXXDefaultConstructor,
  CXXCopyConstructor,
  CXXMoveConstructor,
  CXXCopyAssignment,
  CXXMoveAssignment,
  CXXDestructor,
  CXXInvalid
};

typedef llvm::PointerIntPair<CXXRecordDecl *, 3, CXXSpecialMember>
    SpecialMemberDecl;

/// The C++ special members which we are currently in the process of
/// declaring. If this process recursively triggers the declaration of the
/// same special member, we should act as if it is not yet declared.
llvm::SmallPtrSet<SpecialMemberDecl, 4> SpecialMembersBeingDeclared;

/// The function definitions which were renamed as part of typo-correction
/// to match their respective declarations. We want to keep track of them
/// to ensure that we don't emit a "redefinition" error if we encounter a
/// correctly named definition after the renamed definition.
llvm::SmallPtrSet<const NamedDecl *, 4> TypoCorrectedFunctionDefinitions;

/// Stack of types that correspond to the parameter entities that are
/// currently being copy-initialized. Can be empty.
llvm::SmallVector<QualType, 4> CurrentParameterCopyTypes;

void ReadMethodPool(Selector Sel);
void updateOutOfDateSelector(Selector Sel);

/// Private Helper predicate to check for 'self'.
bool isSelfExpr(Expr *RExpr);
bool isSelfExpr(Expr *RExpr, const ObjCMethodDecl *Method);

/// Cause the active diagnostic on the DiagosticsEngine to be
/// emitted. This is closely coupled to the SemaDiagnosticBuilder class and
/// should not be used elsewhere.
void EmitCurrentDiagnostic(unsigned DiagID);

/// Records and restores the FP_CONTRACT state on entry/exit of compound
/// statements.
class FPContractStateRAII {
public:
  FPContractStateRAII(Sema &S) : S(S), OldFPFeaturesState(S.FPFeatures) {}
  ~FPContractStateRAII() { S.FPFeatures = OldFPFeaturesState; }

private:
  Sema& S;
  FPOptions OldFPFeaturesState;
};

void addImplicitTypedef(StringRef Name, QualType T);

1266public:
Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
     TranslationUnitKind TUKind = TU_Complete,
     CodeCompleteConsumer *CompletionConsumer = nullptr);
~Sema();

/// Perform initialization that occurs after the parser has been
/// initialized but before it parses anything.
void Initialize();

const LangOptions &getLangOpts() const { return LangOpts; }
OpenCLOptions &getOpenCLOptions() { return OpenCLFeatures; }
FPOptions     &getFPOptions() { return FPFeatures; }

DiagnosticsEngine &getDiagnostics() const { return Diags; }
SourceManager &getSourceManager() const { return SourceMgr; }
Preprocessor &getPreprocessor() const { return PP; }
ASTContext &getASTContext() const { return Context; }
ASTConsumer &getASTConsumer() const { return Consumer; }
ASTMutationListener *getASTMutationListener() const;
ExternalSemaSource* getExternalSource() const { return ExternalSource; }

///Registers an external source. If an external source already exists,
/// creates a multiplex external source and appends to it.
///
///\param[in] E - A non-null external sema source.
///
void addExternalSource(ExternalSemaSource *E);

void PrintStats() const;

/// Helper class that creates diagnostics with optional
/// template instantiation stacks.
///
/// This class provides a wrapper around the basic DiagnosticBuilder
/// class that emits diagnostics. SemaDiagnosticBuilder is
/// responsible for emitting the diagnostic (as DiagnosticBuilder
/// does) and, if the diagnostic comes from inside a template
/// instantiation, printing the template instantiation stack as
/// well.
class SemaDiagnosticBuilder : public DiagnosticBuilder {
  Sema &SemaRef;
  unsigned DiagID;

public:
  SemaDiagnosticBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
    : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) { }

  // This is a cunning lie. DiagnosticBuilder actually performs move
  // construction in its copy constructor (but due to varied uses, it's not
  // possible to conveniently express this as actual move construction). So
  // the default copy ctor here is fine, because the base class disables the
  // source anyway, so the user-defined ~SemaDiagnosticBuilder is a safe no-op
  // in that case anwyay.
  SemaDiagnosticBuilder(const SemaDiagnosticBuilder&) = default;

  ~SemaDiagnosticBuilder() {
    // If we aren't active, there is nothing to do.
    if (!isActive()) return;

    // Otherwise, we need to emit the diagnostic. First flush the underlying
    // DiagnosticBuilder data, and clear the diagnostic builder itself so it
    // won't emit the diagnostic in its own destructor.
    //
    // This seems wasteful, in that as written the DiagnosticBuilder dtor will
    // do its own needless checks to see if the diagnostic needs to be
    // emitted. However, because we take care to ensure that the builder
    // objects never escape, a sufficiently smart compiler will be able to
    // eliminate that code.
    FlushCounts();
    Clear();

    // Dispatch to Sema to emit the diagnostic.
    SemaRef.EmitCurrentDiagnostic(DiagID);
  }

  /// Teach operator<< to produce an object of the correct type.
  template<typename T>
  friend const SemaDiagnosticBuilder &operator<<(
      const SemaDiagnosticBuilder &Diag, const T &Value) {
    const DiagnosticBuilder &BaseDiag = Diag;
    BaseDiag << Value;
    return Diag;
  }
};

/// Emit a diagnostic.
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID) {
  DiagnosticBuilder DB = Diags.Report(Loc, DiagID);
  return SemaDiagnosticBuilder(DB, *this, DiagID);
}

/// Emit a partial diagnostic.
SemaDiagnosticBuilder Diag(SourceLocation Loc, const PartialDiagnostic& PD);

/// Build a partial diagnostic.
PartialDiagnostic PDiag(unsigned DiagID = 0); // in SemaInternal.h

bool findMacroSpelling(SourceLocation &loc, StringRef name);

/// Get a string to suggest for zero-initialization of a type.
std::string
getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const;
std::string getFixItZeroLiteralForType(QualType T, SourceLocation Loc) const;

/// Calls \c Lexer::getLocForEndOfToken()
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset = 0);

/// Retrieve the module loader associated with the preprocessor.
ModuleLoader &getModuleLoader() const;

void emitAndClearUnusedLocalTypedefWarnings();

enum TUFragmentKind {
  /// The global module fragment, between 'module;' and a module-declaration.
  Global,
  /// A normal translation unit fragment. For a non-module unit, this is the
  /// entire translation unit. Otherwise, it runs from the module-declaration
  /// to the private-module-fragment (if any) or the end of the TU (if not).
  Normal,
  /// The private module fragment, between 'module :private;' and the end of
  /// the translation unit.
  Private
};

void ActOnStartOfTranslationUnit();
void ActOnEndOfTranslationUnit();
void ActOnEndOfTranslationUnitFragment(TUFragmentKind Kind);

void CheckDelegatingCtorCycles();

Scope *getScopeForContext(DeclContext *Ctx);

void PushFunctionScope();
void PushBlockScope(Scope *BlockScope, BlockDecl *Block);
sema::LambdaScopeInfo *PushLambdaScope();

/// This is used to inform Sema what the current TemplateParameterDepth
/// is during Parsing.  Currently it is used to pass on the depth
/// when parsing generic lambda 'auto' parameters.
void RecordParsingTemplateParameterDepth(unsigned Depth);

void PushCapturedRegionScope(Scope *RegionScope, CapturedDecl *CD,
                             RecordDecl *RD,
                             CapturedRegionKind K);
void
PopFunctionScopeInfo(const sema::AnalysisBasedWarnings::Policy *WP = nullptr,
                     const Decl *D = nullptr,
                     const BlockExpr *blkExpr = nullptr);

sema::FunctionScopeInfo *getCurFunction() const {
  return FunctionScopes.empty() ? nullptr : FunctionScopes.back();
}

sema::FunctionScopeInfo *getEnclosingFunction() const;

void setFunctionHasBranchIntoScope();
void setFunctionHasBranchProtectedScope();
void setFunctionHasIndirectGoto();

void PushCompoundScope(bool IsStmtExpr);
void PopCompoundScope();

sema::CompoundScopeInfo &getCurCompoundScope() const;

bool hasAnyUnrecoverableErrorsInThisFunction() const;

/// Retrieve the current block, if any.
sema::BlockScopeInfo *getCurBlock();

/// Retrieve the current lambda scope info, if any.
/// \param IgnoreNonLambdaCapturingScope true if should find the top-most
/// lambda scope info ignoring all inner capturing scopes that are not
/// lambda scopes.
sema::LambdaScopeInfo *
getCurLambda(bool IgnoreNonLambdaCapturingScope = false);

/// Retrieve the current generic lambda info, if any.
sema::LambdaScopeInfo *getCurGenericLambda();

/// Retrieve the current captured region, if any.
sema::CapturedRegionScopeInfo *getCurCapturedRegion();

/// WeakTopLevelDeclDecls - access to \#pragma weak-generated Decls
SmallVectorImpl<Decl *> &WeakTopLevelDecls() { return WeakTopLevelDecl; }

void ActOnComment(SourceRange Comment);

//===--------------------------------------------------------------------===//
// Type Analysis / Processing: SemaType.cpp.
//

QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs,
                            const DeclSpec *DS = nullptr);
QualType BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVRA,
                            const DeclSpec *DS = nullptr);
QualType BuildPointerType(QualType T,
                          SourceLocation Loc, DeclarationName Entity);
QualType BuildReferenceType(QualType T, bool LValueRef,
                            SourceLocation Loc, DeclarationName Entity);
QualType BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
                        Expr *ArraySize, unsigned Quals,
                        SourceRange Brackets, DeclarationName Entity);
QualType BuildVectorType(QualType T, Expr *VecSize, SourceLocation AttrLoc);
QualType BuildExtVectorType(QualType T, Expr *ArraySize,
                            SourceLocation AttrLoc);
QualType BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace,
                               SourceLocation AttrLoc);

/// Same as above, but constructs the AddressSpace index if not provided.
QualType BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
                               SourceLocation AttrLoc);

bool CheckFunctionReturnType(QualType T, SourceLocation Loc);

/// Build a function type.
///
/// This routine checks the function type according to C++ rules and
/// under the assumption that the result type and parameter types have
/// just been instantiated from a template. It therefore duplicates
/// some of the behavior of GetTypeForDeclarator, but in a much
/// simpler form that is only suitable for this narrow use case.
///
/// \param T The return type of the function.
///
/// \param ParamTypes The parameter types of the function. This array
/// will be modified to account for adjustments to the types of the
/// function parameters.
///
/// \param Loc The location of the entity whose type involves this
/// function type or, if there is no such entity, the location of the
/// type that will have function type.
///
/// \param Entity The name of the entity that involves the function
/// type, if known.
///
/// \param EPI Extra information about the function type. Usually this will
/// be taken from an existing function with the same prototype.
///
/// \returns A suitable function type, if there are no errors. The
/// unqualified type will always be a FunctionProtoType.
/// Otherwise, returns a NULL type.
QualType BuildFunctionType(QualType T,
                           MutableArrayRef<QualType> ParamTypes,
                           SourceLocation Loc, DeclarationName Entity,
                           const FunctionProtoType::ExtProtoInfo &EPI);

QualType BuildMemberPointerType(QualType T, QualType Class,
                                SourceLocation Loc,
                                DeclarationName Entity);
QualType BuildBlockPointerType(QualType T,
                               SourceLocation Loc, DeclarationName Entity);
QualType BuildParenType(QualType T);
QualType BuildAtomicType(QualType T, SourceLocation Loc);
QualType BuildReadPipeType(QualType T,
                       SourceLocation Loc);
QualType BuildWritePipeType(QualType T,
                       SourceLocation Loc);

TypeSourceInfo *GetTypeForDeclarator(Declarator &D, Scope *S);
TypeSourceInfo *GetTypeForDeclaratorCast(Declarator &D, QualType FromTy);

/// Package the given type and TSI into a ParsedType.
ParsedType CreateParsedType(QualType T, TypeSourceInfo *TInfo);
DeclarationNameInfo GetNameForDeclarator(Declarator &D);
DeclarationNameInfo GetNameFromUnqualifiedId(const UnqualifiedId &Name);
static QualType GetTypeFromParser(ParsedType Ty,
                                  TypeSourceInfo **TInfo = nullptr);
CanThrowResult canThrow(const Expr *E);
const FunctionProtoType *ResolveExceptionSpec(SourceLocation Loc,
                                              const FunctionProtoType *FPT);
void UpdateExceptionSpec(FunctionDecl *FD,
                         const FunctionProtoType::ExceptionSpecInfo &ESI);
bool CheckSpecifiedExceptionType(QualType &T, SourceRange Range);
bool CheckDistantExceptionSpec(QualType T);
bool CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New);
bool CheckEquivalentExceptionSpec(
    const FunctionProtoType *Old, SourceLocation OldLoc,
    const FunctionProtoType *New, SourceLocation NewLoc);
bool CheckEquivalentExceptionSpec(
    const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
    const FunctionProtoType *Old, SourceLocation OldLoc,
    const FunctionProtoType *New, SourceLocation NewLoc);
bool handlerCanCatch(QualType HandlerType, QualType ExceptionType);
bool CheckExceptionSpecSubset(const PartialDiagnostic &DiagID,
                              const PartialDiagnostic &NestedDiagID,
                              const PartialDiagnostic &NoteID,
                              const FunctionProtoType *Superset,
                              SourceLocation SuperLoc,
                              const FunctionProtoType *Subset,
                              SourceLocation SubLoc);
bool CheckParamExceptionSpec(const PartialDiagnostic &NestedDiagID,
                             const PartialDiagnostic &NoteID,
                             const FunctionProtoType *Target,
                             SourceLocation TargetLoc,
                             const FunctionProtoType *Source,
                             SourceLocation SourceLoc);

TypeResult ActOnTypeName(Scope *S, Declarator &D);

/// The parser has parsed the context-sensitive type 'instancetype'
/// in an Objective-C message declaration. Return the appropriate type.
ParsedType ActOnObjCInstanceType(SourceLocation Loc);

/// Abstract class used to diagnose incomplete types.
struct TypeDiagnoser {
  TypeDiagnoser() {}

  virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) = 0;
  virtual ~TypeDiagnoser() {}
};

static int getPrintable(int I) { return I; }
static unsigned getPrintable(unsigned I) { return I; }
static bool getPrintable(bool B) { return B; }
static const char * getPrintable(const char *S) { return S; }
static StringRef getPrintable(StringRef S) { return S; }
static const std::string &getPrintable(const std::string &S) { return S; }
static const IdentifierInfo *getPrintable(const IdentifierInfo *II) {
  return II;
}
static DeclarationName getPrintable(DeclarationName N) { return N; }
static QualType getPrintable(QualType T) { return T; }
static SourceRange getPrintable(SourceRange R) { return R; }
static SourceRange getPrintable(SourceLocation L) { return L; }
static SourceRange getPrintable(const Expr *E) { return E->getSourceRange(); }
static SourceRange getPrintable(TypeLoc TL) { return TL.getSourceRange();}

template <typename... Ts> class BoundTypeDiagnoser : public TypeDiagnoser {
  unsigned DiagID;
  std::tuple<const Ts &...> Args;

  template <std::size_t... Is>
  void emit(const SemaDiagnosticBuilder &DB,
            llvm::index_sequence<Is...>) const {
    // Apply all tuple elements to the builder in order.
    bool Dummy[] = {false, (DB << getPrintable(std::get<Is>(Args)))...};
    (void)Dummy;
  }

public:
  BoundTypeDiagnoser(unsigned DiagID, const Ts &...Args)
      : TypeDiagnoser(), DiagID(DiagID), Args(Args...) {
    assert(DiagID != 0 && "no diagnostic for type diagnoser")((DiagID != 0 && "no diagnostic for type diagnoser") ?
 static_cast<void> (0) : __assert_fail ("DiagID != 0 && \"no diagnostic for type diagnoser\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 1609, __PRETTY_FUNCTION__));
  }

  void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
    const SemaDiagnosticBuilder &DB = S.Diag(Loc, DiagID);
    emit(DB, llvm::index_sequence_for<Ts...>());
    DB << T;
  }
};

1619private:
/// Methods for marking which expressions involve dereferencing a pointer
/// marked with the 'noderef' attribute. Expressions are checked bottom up as
/// they are parsed, meaning that a noderef pointer may not be accessed. For
/// example, in `&*p` where `p` is a noderef pointer, we will first parse the
/// `*p`, but need to check that `address of` is called on it. This requires
/// keeping a container of all pending expressions and checking if the address
/// of them are eventually taken.
void CheckSubscriptAccessOfNoDeref(const ArraySubscriptExpr *E);
void CheckAddressOfNoDeref(const Expr *E);
void CheckMemberAccessOfNoDeref(const MemberExpr *E);

bool RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
                             TypeDiagnoser *Diagnoser);

struct ModuleScope {
  SourceLocation BeginLoc;
  clang::Module *Module = nullptr;
  bool ModuleInterface = false;
  bool ImplicitGlobalModuleFragment = false;
  VisibleModuleSet OuterVisibleModules;
};
/// The modules we're currently parsing.
llvm::SmallVector<ModuleScope, 16> ModuleScopes;

/// Namespace definitions that we will export when they finish.
llvm::SmallPtrSet<const NamespaceDecl*, 8> DeferredExportedNamespaces;

/// Get the module whose scope we are currently within.
Module *getCurrentModule() const {
  return ModuleScopes.empty() ? nullptr : ModuleScopes.back().Module;
}

VisibleModuleSet VisibleModules;

1654public:
/// Get the module owning an entity.
Module *getOwningModule(Decl *Entity) { return Entity->getOwningModule(); }

/// Make a merged definition of an existing hidden definition \p ND
/// visible at the specified location.
void makeMergedDefinitionVisible(NamedDecl *ND);

bool isModuleVisible(const Module *M, bool ModulePrivate = false);

/// Determine whether a declaration is visible to name lookup.
bool isVisible(const NamedDecl *D) {
  return !D->isHidden() || isVisibleSlow(D);
}

/// Determine whether any declaration of an entity is visible.
bool
hasVisibleDeclaration(const NamedDecl *D,
                      llvm::SmallVectorImpl<Module *> *Modules = nullptr) {
  return isVisible(D) || hasVisibleDeclarationSlow(D, Modules);
}
bool hasVisibleDeclarationSlow(const NamedDecl *D,
                               llvm::SmallVectorImpl<Module *> *Modules);

bool hasVisibleMergedDefinition(NamedDecl *Def);
bool hasMergedDefinitionInCurrentModule(NamedDecl *Def);

/// Determine if \p D and \p Suggested have a structurally compatible
/// layout as described in C11 6.2.7/1.
bool hasStructuralCompatLayout(Decl *D, Decl *Suggested);

/// Determine if \p D has a visible definition. If not, suggest a declaration
/// that should be made visible to expose the definition.
bool hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
                          bool OnlyNeedComplete = false);
bool hasVisibleDefinition(const NamedDecl *D) {
  NamedDecl *Hidden;
  return hasVisibleDefinition(const_cast<NamedDecl*>(D), &Hidden);
}

/// Determine if the template parameter \p D has a visible default argument.
bool
hasVisibleDefaultArgument(const NamedDecl *D,
                          llvm::SmallVectorImpl<Module *> *Modules = nullptr);

/// Determine if there is a visible declaration of \p D that is an explicit
/// specialization declaration for a specialization of a template. (For a
/// member specialization, use hasVisibleMemberSpecialization.)
bool hasVisibleExplicitSpecialization(
    const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);

/// Determine if there is a visible declaration of \p D that is a member
/// specialization declaration (as opposed to an instantiated declaration).
bool hasVisibleMemberSpecialization(
    const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);

/// Determine if \p A and \p B are equivalent internal linkage declarations
/// from different modules, and thus an ambiguity error can be downgraded to
/// an extension warning.
bool isEquivalentInternalLinkageDeclaration(const NamedDecl *A,
                                            const NamedDecl *B);
void diagnoseEquivalentInternalLinkageDeclarations(
    SourceLocation Loc, const NamedDecl *D,
    ArrayRef<const NamedDecl *> Equiv);

bool isUsualDeallocationFunction(const CXXMethodDecl *FD);

bool isCompleteType(SourceLocation Loc, QualType T) {
  return !RequireCompleteTypeImpl(Loc, T, nullptr);
}
bool RequireCompleteType(SourceLocation Loc, QualType T,
                         TypeDiagnoser &Diagnoser);
bool RequireCompleteType(SourceLocation Loc, QualType T,
                         unsigned DiagID);

template <typename... Ts>
bool RequireCompleteType(SourceLocation Loc, QualType T, unsigned DiagID,
                         const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireCompleteType(Loc, T, Diagnoser);
}

void completeExprArrayBound(Expr *E);
bool RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser);
bool RequireCompleteExprType(Expr *E, unsigned DiagID);

template <typename... Ts>
bool RequireCompleteExprType(Expr *E, unsigned DiagID, const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireCompleteExprType(E, Diagnoser);
}

bool RequireLiteralType(SourceLocation Loc, QualType T,
                        TypeDiagnoser &Diagnoser);
bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID);

template <typename... Ts>
bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID,
                        const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireLiteralType(Loc, T, Diagnoser);
}

QualType getElaboratedType(ElaboratedTypeKeyword Keyword,
                           const CXXScopeSpec &SS, QualType T,
                           TagDecl *OwnedTagDecl = nullptr);

QualType BuildTypeofExprType(Expr *E, SourceLocation Loc);
/// If AsUnevaluated is false, E is treated as though it were an evaluated
/// context, such as when building a type for decltype(auto).
QualType BuildDecltypeType(Expr *E, SourceLocation Loc,
                           bool AsUnevaluated = true);
QualType BuildUnaryTransformType(QualType BaseType,
                                 UnaryTransformType::UTTKind UKind,
                                 SourceLocation Loc);

//===--------------------------------------------------------------------===//
// Symbol table / Decl tracking callbacks: SemaDecl.cpp.
//

struct SkipBodyInfo {
  SkipBodyInfo()
      : ShouldSkip(false), CheckSameAsPrevious(false), Previous(nullptr),
        New(nullptr) {}
  bool ShouldSkip;
  bool CheckSameAsPrevious;
  NamedDecl *Previous;
  NamedDecl *New;
};

DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType = nullptr);

void DiagnoseUseOfUnimplementedSelectors();

bool isSimpleTypeSpecifier(tok::TokenKind Kind) const;

ParsedType getTypeName(const IdentifierInfo &II, SourceLocation NameLoc,
                       Scope *S, CXXScopeSpec *SS = nullptr,
                       bool isClassName = false, bool HasTrailingDot = false,
                       ParsedType ObjectType = nullptr,
                       bool IsCtorOrDtorName = false,
                       bool WantNontrivialTypeSourceInfo = false,
                       bool IsClassTemplateDeductionContext = true,
                       IdentifierInfo **CorrectedII = nullptr);
TypeSpecifierType isTagName(IdentifierInfo &II, Scope *S);
bool isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S);
void DiagnoseUnknownTypeName(IdentifierInfo *&II,
                             SourceLocation IILoc,
                             Scope *S,
                             CXXScopeSpec *SS,
                             ParsedType &SuggestedType,
                             bool IsTemplateName = false);

/// Attempt to behave like MSVC in situations where lookup of an unqualified
/// type name has failed in a dependent context. In these situations, we
/// automatically form a DependentTypeName that will retry lookup in a related
/// scope during instantiation.
ParsedType ActOnMSVCUnknownTypeName(const IdentifierInfo &II,
                                    SourceLocation NameLoc,
                                    bool IsTemplateTypeArg);

/// Describes the result of the name lookup and resolution performed
/// by \c ClassifyName().
enum NameClassificationKind {
  NC_Unknown,
  NC_Error,
  NC_Keyword,
  NC_Type,
  NC_Expression,
  NC_NestedNameSpecifier,
  NC_TypeTemplate,
  NC_VarTemplate,
  NC_FunctionTemplate,
  NC_UndeclaredTemplate,
};

class NameClassification {
  NameClassificationKind Kind;
  ExprResult Expr;
  TemplateName Template;
  ParsedType Type;

  explicit NameClassification(NameClassificationKind Kind) : Kind(Kind) {}

public:
  NameClassification(ExprResult Expr) : Kind(NC_Expression), Expr(Expr) {}

  NameClassification(ParsedType Type) : Kind(NC_Type), Type(Type) {}

  NameClassification(const IdentifierInfo *Keyword) : Kind(NC_Keyword) {}

  static NameClassification Error() {
    return NameClassification(NC_Error);
  }

  static NameClassification Unknown() {
    return NameClassification(NC_Unknown);
  }

  static NameClassification NestedNameSpecifier() {
    return NameClassification(NC_NestedNameSpecifier);
  }

  static NameClassification TypeTemplate(TemplateName Name) {
    NameClassification Result(NC_TypeTemplate);
    Result.Template = Name;
    return Result;
  }

  static NameClassification VarTemplate(TemplateName Name) {
    NameClassification Result(NC_VarTemplate);
    Result.Template = Name;
    return Result;
  }

  static NameClassification FunctionTemplate(TemplateName Name) {
    NameClassification Result(NC_FunctionTemplate);
    Result.Template = Name;
    return Result;
  }

  static NameClassification UndeclaredTemplate(TemplateName Name) {
    NameClassification Result(NC_UndeclaredTemplate);
    Result.Template = Name;
    return Result;
  }

  NameClassificationKind getKind() const { return Kind; }

  ParsedType getType() const {
    assert(Kind == NC_Type)((Kind == NC_Type) ? static_cast<void> (0) : __assert_fail
 ("Kind == NC_Type", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 1884, __PRETTY_FUNCTION__));
    return Type;
  }

  ExprResult getExpression() const {
    assert(Kind == NC_Expression)((Kind == NC_Expression) ? static_cast<void> (0) : __assert_fail
 ("Kind == NC_Expression", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 1889, __PRETTY_FUNCTION__));
    return Expr;
  }

  TemplateName getTemplateName() const {
    assert(Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate ||((Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind
 == NC_VarTemplate || Kind == NC_UndeclaredTemplate) ? static_cast
<void> (0) : __assert_fail ("Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind == NC_VarTemplate || Kind == NC_UndeclaredTemplate"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 1895, __PRETTY_FUNCTION__))
           Kind == NC_VarTemplate || Kind == NC_UndeclaredTemplate)((Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind
 == NC_VarTemplate || Kind == NC_UndeclaredTemplate) ? static_cast
<void> (0) : __assert_fail ("Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind == NC_VarTemplate || Kind == NC_UndeclaredTemplate"
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 1895, __PRETTY_FUNCTION__));
    return Template;
  }

  TemplateNameKind getTemplateNameKind() const {
    switch (Kind) {
    case NC_TypeTemplate:
      return TNK_Type_template;
    case NC_FunctionTemplate:
      return TNK_Function_template;
    case NC_VarTemplate:
      return TNK_Var_template;
    case NC_UndeclaredTemplate:
      return TNK_Undeclared_template;
    default:
      llvm_unreachable("unsupported name classification.")::llvm::llvm_unreachable_internal("unsupported name classification."
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 1910);
    }
  }
};

/// Perform name lookup on the given name, classifying it based on
/// the results of name lookup and the following token.
///
/// This routine is used by the parser to resolve identifiers and help direct
/// parsing. When the identifier cannot be found, this routine will attempt
/// to correct the typo and classify based on the resulting name.
///
/// \param S The scope in which we're performing name lookup.
///
/// \param SS The nested-name-specifier that precedes the name.
///
/// \param Name The identifier. If typo correction finds an alternative name,
/// this pointer parameter will be updated accordingly.
///
/// \param NameLoc The location of the identifier.
///
/// \param NextToken The token following the identifier. Used to help
/// disambiguate the name.
///
/// \param IsAddressOfOperand True if this name is the operand of a unary
///        address of ('&') expression, assuming it is classified as an
///        expression.
///
/// \param CCC The correction callback, if typo correction is desired.
NameClassification ClassifyName(Scope *S, CXXScopeSpec &SS,
                                IdentifierInfo *&Name, SourceLocation NameLoc,
                                const Token &NextToken,
                                bool IsAddressOfOperand,
                                CorrectionCandidateCallback *CCC = nullptr);

/// Describes the detailed kind of a template name. Used in diagnostics.
enum class TemplateNameKindForDiagnostics {
  ClassTemplate,
  FunctionTemplate,
  VarTemplate,
  AliasTemplate,
  TemplateTemplateParam,
  DependentTemplate
};
TemplateNameKindForDiagnostics
getTemplateNameKindForDiagnostics(TemplateName Name);

/// Determine whether it's plausible that E was intended to be a
/// template-name.
bool mightBeIntendedToBeTemplateName(ExprResult E, bool &Dependent) {
  if (!getLangOpts().CPlusPlus || E.isInvalid())
    return false;
  Dependent = false;
  if (auto *DRE = dyn_cast<DeclRefExpr>(E.get()))
    return !DRE->hasExplicitTemplateArgs();
  if (auto *ME = dyn_cast<MemberExpr>(E.get()))
    return !ME->hasExplicitTemplateArgs();
  Dependent = true;
  if (auto *DSDRE = dyn_cast<DependentScopeDeclRefExpr>(E.get()))
    return !DSDRE->hasExplicitTemplateArgs();
  if (auto *DSME = dyn_cast<CXXDependentScopeMemberExpr>(E.get()))
    return !DSME->hasExplicitTemplateArgs();
  // Any additional cases recognized here should also be handled by
  // diagnoseExprIntendedAsTemplateName.
  return false;
}
void diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName,
                                        SourceLocation Less,
                                        SourceLocation Greater);

Decl *ActOnDeclarator(Scope *S, Declarator &D);

NamedDecl *HandleDeclarator(Scope *S, Declarator &D,
                            MultiTemplateParamsArg TemplateParameterLists);
void RegisterLocallyScopedExternCDecl(NamedDecl *ND, Scope *S);
bool DiagnoseClassNameShadow(DeclContext *DC, DeclarationNameInfo Info);
bool diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
                                  DeclarationName Name, SourceLocation Loc,
                                  bool IsTemplateId);
void
diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
                          SourceLocation FallbackLoc,
                          SourceLocation ConstQualLoc = SourceLocation(),
                          SourceLocation VolatileQualLoc = SourceLocation(),
                          SourceLocation RestrictQualLoc = SourceLocation(),
                          SourceLocation AtomicQualLoc = SourceLocation(),
                          SourceLocation UnalignedQualLoc = SourceLocation());

static bool adjustContextForLocalExternDecl(DeclContext *&DC);
void DiagnoseFunctionSpecifiers(const DeclSpec &DS);
NamedDecl *getShadowedDeclaration(const TypedefNameDecl *D,
                                  const LookupResult &R);
NamedDecl *getShadowedDeclaration(const VarDecl *D, const LookupResult &R);
void CheckShadow(NamedDecl *D, NamedDecl *ShadowedDecl,
                 const LookupResult &R);
void CheckShadow(Scope *S, VarDecl *D);

/// Warn if 'E', which is an expression that is about to be modified, refers
/// to a shadowing declaration.
void CheckShadowingDeclModification(Expr *E, SourceLocation Loc);

void DiagnoseShadowingLambdaDecls(const sema::LambdaScopeInfo *LSI);

2013private:
/// Map of current shadowing declarations to shadowed declarations. Warn if
/// it looks like the user is trying to modify the shadowing declaration.
llvm::DenseMap<const NamedDecl *, const NamedDecl *> ShadowingDecls;

2018public:
void CheckCastAlign(Expr *Op, QualType T, SourceRange TRange);
void handleTagNumbering(const TagDecl *Tag, Scope *TagScope);
void setTagNameForLinkagePurposes(TagDecl *TagFromDeclSpec,
                                  TypedefNameDecl *NewTD);
void CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *D);
NamedDecl* ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
                                  TypeSourceInfo *TInfo,
                                  LookupResult &Previous);
NamedDecl* ActOnTypedefNameDecl(Scope* S, DeclContext* DC, TypedefNameDecl *D,
                                LookupResult &Previous, bool &Redeclaration);
NamedDecl *ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
                                   TypeSourceInfo *TInfo,
                                   LookupResult &Previous,
                                   MultiTemplateParamsArg TemplateParamLists,
                                   bool &AddToScope,
                                   ArrayRef<BindingDecl *> Bindings = None);
NamedDecl *
ActOnDecompositionDeclarator(Scope *S, Declarator &D,
                             MultiTemplateParamsArg TemplateParamLists);
// Returns true if the variable declaration is a redeclaration
bool CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous);
void CheckVariableDeclarationType(VarDecl *NewVD);
bool DeduceVariableDeclarationType(VarDecl *VDecl, bool DirectInit,
                                   Expr *Init);
void CheckCompleteVariableDeclaration(VarDecl *VD);
void CheckCompleteDecompositionDeclaration(DecompositionDecl *DD);
void MaybeSuggestAddingStaticToDecl(const FunctionDecl *D);

NamedDecl* ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
                                   TypeSourceInfo *TInfo,
                                   LookupResult &Previous,
                                   MultiTemplateParamsArg TemplateParamLists,
                                   bool &AddToScope);
bool AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD);

bool CheckConstexprFunctionDecl(const FunctionDecl *FD);
bool CheckConstexprFunctionBody(const FunctionDecl *FD, Stmt *Body);

void DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD);
void FindHiddenVirtualMethods(CXXMethodDecl *MD,
                        SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
void NoteHiddenVirtualMethods(CXXMethodDecl *MD,
                        SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
// Returns true if the function declaration is a redeclaration
bool CheckFunctionDeclaration(Scope *S,
                              FunctionDecl *NewFD, LookupResult &Previous,
                              bool IsMemberSpecialization);
bool shouldLinkDependentDeclWithPrevious(Decl *D, Decl *OldDecl);
bool canFullyTypeCheckRedeclaration(ValueDecl *NewD, ValueDecl *OldD,
                                    QualType NewT, QualType OldT);
void CheckMain(FunctionDecl *FD, const DeclSpec &D);
void CheckMSVCRTEntryPoint(FunctionDecl *FD);
Attr *getImplicitCodeSegOrSectionAttrForFunction(const FunctionDecl *FD, bool IsDefinition);
Decl *ActOnParamDeclarator(Scope *S, Declarator &D);
ParmVarDecl *BuildParmVarDeclForTypedef(DeclContext *DC,
                                        SourceLocation Loc,
                                        QualType T);
ParmVarDecl *CheckParameter(DeclContext *DC, SourceLocation StartLoc,
                            SourceLocation NameLoc, IdentifierInfo *Name,
                            QualType T, TypeSourceInfo *TSInfo,
                            StorageClass SC);
void ActOnParamDefaultArgument(Decl *param,
                               SourceLocation EqualLoc,
                               Expr *defarg);
void ActOnParamUnparsedDefaultArgument(Decl *param,
                                       SourceLocation EqualLoc,
                                       SourceLocation ArgLoc);
void ActOnParamDefaultArgumentError(Decl *param, SourceLocation EqualLoc);
bool SetParamDefaultArgument(ParmVarDecl *Param, Expr *DefaultArg,
                             SourceLocation EqualLoc);

void AddInitializerToDecl(Decl *dcl, Expr *init, bool DirectInit);
void ActOnUninitializedDecl(Decl *dcl);
void ActOnInitializerError(Decl *Dcl);

void ActOnPureSpecifier(Decl *D, SourceLocation PureSpecLoc);
void ActOnCXXForRangeDecl(Decl *D);
StmtResult ActOnCXXForRangeIdentifier(Scope *S, SourceLocation IdentLoc,
                                      IdentifierInfo *Ident,
                                      ParsedAttributes &Attrs,
                                      SourceLocation AttrEnd);
void SetDeclDeleted(Decl *dcl, SourceLocation DelLoc);
void SetDeclDefaulted(Decl *dcl, SourceLocation DefaultLoc);
void CheckStaticLocalForDllExport(VarDecl *VD);
void FinalizeDeclaration(Decl *D);
DeclGroupPtrTy FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
                                       ArrayRef<Decl *> Group);
DeclGroupPtrTy BuildDeclaratorGroup(MutableArrayRef<Decl *> Group);

/// Should be called on all declarations that might have attached
/// documentation comments.
void ActOnDocumentableDecl(Decl *D);
void ActOnDocumentableDecls(ArrayRef<Decl *> Group);

void ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
                                     SourceLocation LocAfterDecls);
void CheckForFunctionRedefinition(
    FunctionDecl *FD, const FunctionDecl *EffectiveDefinition = nullptr,
    SkipBodyInfo *SkipBody = nullptr);
Decl *ActOnStartOfFunctionDef(Scope *S, Declarator &D,
                              MultiTemplateParamsArg TemplateParamLists,
                              SkipBodyInfo *SkipBody = nullptr);
Decl *ActOnStartOfFunctionDef(Scope *S, Decl *D,
                              SkipBodyInfo *SkipBody = nullptr);
void ActOnStartOfObjCMethodDef(Scope *S, Decl *D);
bool isObjCMethodDecl(Decl *D) {
  return D && isa<ObjCMethodDecl>(D);
}

/// Determine whether we can delay parsing the body of a function or
/// function template until it is used, assuming we don't care about emitting
/// code for that function.
///
/// This will be \c false if we may need the body of the function in the
/// middle of parsing an expression (where it's impractical to switch to
/// parsing a different function), for instance, if it's constexpr in C++11
/// or has an 'auto' return type in C++14. These cases are essentially bugs.
bool canDelayFunctionBody(const Declarator &D);

/// Determine whether we can skip parsing the body of a function
/// definition, assuming we don't care about analyzing its body or emitting
/// code for that function.
///
/// This will be \c false only if we may need the body of the function in
/// order to parse the rest of the program (for instance, if it is
/// \c constexpr in C++11 or has an 'auto' return type in C++14).
bool canSkipFunctionBody(Decl *D);

void computeNRVO(Stmt *Body, sema::FunctionScopeInfo *Scope);
Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body);
Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body, bool IsInstantiation);
Decl *ActOnSkippedFunctionBody(Decl *Decl);
void ActOnFinishInlineFunctionDef(FunctionDecl *D);

/// ActOnFinishDelayedAttribute - Invoked when we have finished parsing an
/// attribute for which parsing is delayed.
void ActOnFinishDelayedAttribute(Scope *S, Decl *D, ParsedAttributes &Attrs);

/// Diagnose any unused parameters in the given sequence of
/// ParmVarDecl pointers.
void DiagnoseUnusedParameters(ArrayRef<ParmVarDecl *> Parameters);

/// Diagnose whether the size of parameters or return value of a
/// function or obj-c method definition is pass-by-value and larger than a
/// specified threshold.
void
DiagnoseSizeOfParametersAndReturnValue(ArrayRef<ParmVarDecl *> Parameters,
                                       QualType ReturnTy, NamedDecl *D);

void DiagnoseInvalidJumps(Stmt *Body);
Decl *ActOnFileScopeAsmDecl(Expr *expr,
                            SourceLocation AsmLoc,
                            SourceLocation RParenLoc);

/// Handle a C++11 empty-declaration and attribute-declaration.
Decl *ActOnEmptyDeclaration(Scope *S, const ParsedAttributesView &AttrList,
                            SourceLocation SemiLoc);

enum class ModuleDeclKind {
  Interface,      ///< 'export module X;'
  Implementation, ///< 'module X;'
};

/// The parser has processed a module-declaration that begins the definition
/// of a module interface or implementation.
DeclGroupPtrTy ActOnModuleDecl(SourceLocation StartLoc,
                               SourceLocation ModuleLoc, ModuleDeclKind MDK,
                               ModuleIdPath Path, bool IsFirstDecl);

/// The parser has processed a global-module-fragment declaration that begins
/// the definition of the global module fragment of the current module unit.
/// \param ModuleLoc The location of the 'module' keyword.
DeclGroupPtrTy ActOnGlobalModuleFragmentDecl(SourceLocation ModuleLoc);

/// The parser has processed a private-module-fragment declaration that begins
/// the definition of the private module fragment of the current module unit.
/// \param ModuleLoc The location of the 'module' keyword.
/// \param PrivateLoc The location of the 'private' keyword.
DeclGroupPtrTy ActOnPrivateModuleFragmentDecl(SourceLocation ModuleLoc,
                                              SourceLocation PrivateLoc);

/// The parser has processed a module import declaration.
///
/// \param StartLoc The location of the first token in the declaration. This
///        could be the location of an '@', 'export', or 'import'.
/// \param ExportLoc The location of the 'export' keyword, if any.
/// \param ImportLoc The location of the 'import' keyword.
/// \param Path The module access path.
DeclResult ActOnModuleImport(SourceLocation StartLoc,
                             SourceLocation ExportLoc,
                             SourceLocation ImportLoc, ModuleIdPath Path);
DeclResult ActOnModuleImport(SourceLocation StartLoc,
                             SourceLocation ExportLoc,
                             SourceLocation ImportLoc, Module *M,
                             ModuleIdPath Path = {});

/// The parser has processed a module import translated from a
/// #include or similar preprocessing directive.
void ActOnModuleInclude(SourceLocation DirectiveLoc, Module *Mod);
void BuildModuleInclude(SourceLocation DirectiveLoc, Module *Mod);

/// The parsed has entered a submodule.
void ActOnModuleBegin(SourceLocation DirectiveLoc, Module *Mod);
/// The parser has left a submodule.
void ActOnModuleEnd(SourceLocation DirectiveLoc, Module *Mod);

/// Create an implicit import of the given module at the given
/// source location, for error recovery, if possible.
///
/// This routine is typically used when an entity found by name lookup
/// is actually hidden within a module that we know about but the user
/// has forgotten to import.
void createImplicitModuleImportForErrorRecovery(SourceLocation Loc,
                                                Module *Mod);

/// Kinds of missing import. Note, the values of these enumerators correspond
/// to %select values in diagnostics.
enum class MissingImportKind {
  Declaration,
  Definition,
  DefaultArgument,
  ExplicitSpecialization,
  PartialSpecialization
};

/// Diagnose that the specified declaration needs to be visible but
/// isn't, and suggest a module import that would resolve the problem.
void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
                           MissingImportKind MIK, bool Recover = true);
void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
                           SourceLocation DeclLoc, ArrayRef<Module *> Modules,
                           MissingImportKind MIK, bool Recover);

Decl *ActOnStartExportDecl(Scope *S, SourceLocation ExportLoc,
                           SourceLocation LBraceLoc);
Decl *ActOnFinishExportDecl(Scope *S, Decl *ExportDecl,
                            SourceLocation RBraceLoc);

/// We've found a use of a templated declaration that would trigger an
/// implicit instantiation. Check that any relevant explicit specializations
/// and partial specializations are visible, and diagnose if not.
void checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec);

/// We've found a use of a template specialization that would select a
/// partial specialization. Check that the partial specialization is visible,
/// and diagnose if not.
void checkPartialSpecializationVisibility(SourceLocation Loc,
                                          NamedDecl *Spec);

/// Retrieve a suitable printing policy for diagnostics.
PrintingPolicy getPrintingPolicy() const {
  return getPrintingPolicy(Context, PP);
}

/// Retrieve a suitable printing policy for diagnostics.
static PrintingPolicy getPrintingPolicy(const ASTContext &Ctx,
                                        const Preprocessor &PP);

/// Scope actions.
void ActOnPopScope(SourceLocation Loc, Scope *S);
void ActOnTranslationUnitScope(Scope *S);

Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
                                 RecordDecl *&AnonRecord);
Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
                                 MultiTemplateParamsArg TemplateParams,
                                 bool IsExplicitInstantiation,
                                 RecordDecl *&AnonRecord);

Decl *BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
                                  AccessSpecifier AS,
                                  RecordDecl *Record,
                                  const PrintingPolicy &Policy);

Decl *BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
                                     RecordDecl *Record);

/// Common ways to introduce type names without a tag for use in diagnostics.
/// Keep in sync with err_tag_reference_non_tag.
enum NonTagKind {
  NTK_NonStruct,
  NTK_NonClass,
  NTK_NonUnion,
  NTK_NonEnum,
  NTK_Typedef,
  NTK_TypeAlias,
  NTK_Template,
  NTK_TypeAliasTemplate,
  NTK_TemplateTemplateArgument,
};

/// Given a non-tag type declaration, returns an enum useful for indicating
/// what kind of non-tag type this is.
NonTagKind getNonTagTypeDeclKind(const Decl *D, TagTypeKind TTK);

bool isAcceptableTagRedeclaration(const TagDecl *Previous,
                                  TagTypeKind NewTag, bool isDefinition,
                                  SourceLocation NewTagLoc,
                                  const IdentifierInfo *Name);

enum TagUseKind {
  TUK_Reference,   // Reference to a tag:  'struct foo *X;'
  TUK_Declaration, // Fwd decl of a tag:   'struct foo;'
  TUK_Definition,  // Definition of a tag: 'struct foo { int X; } Y;'
  TUK_Friend       // Friend declaration:  'friend struct foo;'
};

Decl *ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
               SourceLocation KWLoc, CXXScopeSpec &SS, IdentifierInfo *Name,
               SourceLocation NameLoc, const ParsedAttributesView &Attr,
               AccessSpecifier AS, SourceLocation ModulePrivateLoc,
               MultiTemplateParamsArg TemplateParameterLists, bool &OwnedDecl,
               bool &IsDependent, SourceLocation ScopedEnumKWLoc,
               bool ScopedEnumUsesClassTag, TypeResult UnderlyingType,
               bool IsTypeSpecifier, bool IsTemplateParamOrArg,
               SkipBodyInfo *SkipBody = nullptr);

Decl *ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
                              unsigned TagSpec, SourceLocation TagLoc,
                              CXXScopeSpec &SS, IdentifierInfo *Name,
                              SourceLocation NameLoc,
                              const ParsedAttributesView &Attr,
                              MultiTemplateParamsArg TempParamLists);

TypeResult ActOnDependentTag(Scope *S,
                             unsigned TagSpec,
                             TagUseKind TUK,
                             const CXXScopeSpec &SS,
                             IdentifierInfo *Name,
                             SourceLocation TagLoc,
                             SourceLocation NameLoc);

void ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart,
               IdentifierInfo *ClassName,
               SmallVectorImpl<Decl *> &Decls);
Decl *ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
                 Declarator &D, Expr *BitfieldWidth);

FieldDecl *HandleField(Scope *S, RecordDecl *TagD, SourceLocation DeclStart,
                       Declarator &D, Expr *BitfieldWidth,
                       InClassInitStyle InitStyle,
                       AccessSpecifier AS);
MSPropertyDecl *HandleMSProperty(Scope *S, RecordDecl *TagD,
                                 SourceLocation DeclStart, Declarator &D,
                                 Expr *BitfieldWidth,
                                 InClassInitStyle InitStyle,
                                 AccessSpecifier AS,
                                 const ParsedAttr &MSPropertyAttr);

FieldDecl *CheckFieldDecl(DeclarationName Name, QualType T,
                          TypeSourceInfo *TInfo,
                          RecordDecl *Record, SourceLocation Loc,
                          bool Mutable, Expr *BitfieldWidth,
                          InClassInitStyle InitStyle,
                          SourceLocation TSSL,
                          AccessSpecifier AS, NamedDecl *PrevDecl,
                          Declarator *D = nullptr);

bool CheckNontrivialField(FieldDecl *FD);
void DiagnoseNontrivial(const CXXRecordDecl *Record, CXXSpecialMember CSM);

enum TrivialABIHandling {
  /// The triviality of a method unaffected by "trivial_abi".
  TAH_IgnoreTrivialABI,

  /// The triviality of a method affected by "trivial_abi".
  TAH_ConsiderTrivialABI
};

bool SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
                            TrivialABIHandling TAH = TAH_IgnoreTrivialABI,
                            bool Diagnose = false);
CXXSpecialMember getSpecialMember(const CXXMethodDecl *MD);
void ActOnLastBitfield(SourceLocation DeclStart,
                       SmallVectorImpl<Decl *> &AllIvarDecls);
Decl *ActOnIvar(Scope *S, SourceLocation DeclStart,
                Declarator &D, Expr *BitfieldWidth,
                tok::ObjCKeywordKind visibility);

// This is used for both record definitions and ObjC interface declarations.
void ActOnFields(Scope *S, SourceLocation RecLoc, Decl *TagDecl,
                 ArrayRef<Decl *> Fields, SourceLocation LBrac,
                 SourceLocation RBrac, const ParsedAttributesView &AttrList);

/// ActOnTagStartDefinition - Invoked when we have entered the
/// scope of a tag's definition (e.g., for an enumeration, class,
/// struct, or union).
void ActOnTagStartDefinition(Scope *S, Decl *TagDecl);

/// Perform ODR-like check for C/ObjC when merging tag types from modules.
/// Differently from C++, actually parse the body and reject / error out
/// in case of a structural mismatch.
bool ActOnDuplicateDefinition(DeclSpec &DS, Decl *Prev,
                              SkipBodyInfo &SkipBody);

typedef void *SkippedDefinitionContext;

/// Invoked when we enter a tag definition that we're skipping.
SkippedDefinitionContext ActOnTagStartSkippedDefinition(Scope *S, Decl *TD);

Decl *ActOnObjCContainerStartDefinition(Decl *IDecl);

/// ActOnStartCXXMemberDeclarations - Invoked when we have parsed a
/// C++ record definition's base-specifiers clause and are starting its
/// member declarations.
void ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagDecl,
                                     SourceLocation FinalLoc,
                                     bool IsFinalSpelledSealed,
                                     SourceLocation LBraceLoc);

/// ActOnTagFinishDefinition - Invoked once we have finished parsing
/// the definition of a tag (enumeration, class, struct, or union).
void ActOnTagFinishDefinition(Scope *S, Decl *TagDecl,
                              SourceRange BraceRange);

void ActOnTagFinishSkippedDefinition(SkippedDefinitionContext Context);

void ActOnObjCContainerFinishDefinition();

/// Invoked when we must temporarily exit the objective-c container
/// scope for parsing/looking-up C constructs.
///
/// Must be followed by a call to \see ActOnObjCReenterContainerContext
void ActOnObjCTemporaryExitContainerContext(DeclContext *DC);
void ActOnObjCReenterContainerContext(DeclContext *DC);

/// ActOnTagDefinitionError - Invoked when there was an unrecoverable
/// error parsing the definition of a tag.
void ActOnTagDefinitionError(Scope *S, Decl *TagDecl);

EnumConstantDecl *CheckEnumConstant(EnumDecl *Enum,
                                    EnumConstantDecl *LastEnumConst,
                                    SourceLocation IdLoc,
                                    IdentifierInfo *Id,
                                    Expr *val);
bool CheckEnumUnderlyingType(TypeSourceInfo *TI);
bool CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
                            QualType EnumUnderlyingTy, bool IsFixed,
                            const EnumDecl *Prev);

/// Determine whether the body of an anonymous enumeration should be skipped.
/// \param II The name of the first enumerator.
SkipBodyInfo shouldSkipAnonEnumBody(Scope *S, IdentifierInfo *II,
                                    SourceLocation IILoc);

Decl *ActOnEnumConstant(Scope *S, Decl *EnumDecl, Decl *LastEnumConstant,
                        SourceLocation IdLoc, IdentifierInfo *Id,
                        const ParsedAttributesView &Attrs,
                        SourceLocation EqualLoc, Expr *Val);
void ActOnEnumBody(SourceLocation EnumLoc, SourceRange BraceRange,
                   Decl *EnumDecl, ArrayRef<Decl *> Elements, Scope *S,
                   const ParsedAttributesView &Attr);

DeclContext *getContainingDC(DeclContext *DC);

/// Set the current declaration context until it gets popped.
void PushDeclContext(Scope *S, DeclContext *DC);
void PopDeclContext();

/// EnterDeclaratorContext - Used when we must lookup names in the context
/// of a declarator's nested name specifier.
void EnterDeclaratorContext(Scope *S, DeclContext *DC);
void ExitDeclaratorContext(Scope *S);

/// Push the parameters of D, which must be a function, into scope.
void ActOnReenterFunctionContext(Scope* S, Decl* D);
void ActOnExitFunctionContext();

DeclContext *getFunctionLevelDeclContext();

/// getCurFunctionDecl - If inside of a function body, this returns a pointer
/// to the function decl for the function being parsed.  If we're currently
/// in a 'block', this returns the containing context.
FunctionDecl *getCurFunctionDecl();

/// getCurMethodDecl - If inside of a method body, this returns a pointer to
/// the method decl for the method being parsed.  If we're currently
/// in a 'block', this returns the containing context.
ObjCMethodDecl *getCurMethodDecl();

/// getCurFunctionOrMethodDecl - Return the Decl for the current ObjC method
/// or C function we're in, otherwise return null.  If we're currently
/// in a 'block', this returns the containing context.
NamedDecl *getCurFunctionOrMethodDecl();

/// Add this decl to the scope shadowed decl chains.
void PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext = true);

/// isDeclInScope - If 'Ctx' is a function/method, isDeclInScope returns true
/// if 'D' is in Scope 'S', otherwise 'S' is ignored and isDeclInScope returns
/// true if 'D' belongs to the given declaration context.
///
/// \param AllowInlineNamespace If \c true, allow the declaration to be in the
///        enclosing namespace set of the context, rather than contained
///        directly within it.
bool isDeclInScope(NamedDecl *D, DeclContext *Ctx, Scope *S = nullptr,
                   bool AllowInlineNamespace = false);

/// Finds the scope corresponding to the given decl context, if it
/// happens to be an enclosing scope.  Otherwise return NULL.
static Scope *getScopeForDeclContext(Scope *S, DeclContext *DC);

/// Subroutines of ActOnDeclarator().
TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
                              TypeSourceInfo *TInfo);
bool isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New);

/// Describes the kind of merge to perform for availability
/// attributes (including "deprecated", "unavailable", and "availability").
enum AvailabilityMergeKind {
  /// Don't merge availability attributes at all.
  AMK_None,
  /// Merge availability attributes for a redeclaration, which requires
  /// an exact match.
  AMK_Redeclaration,
  /// Merge availability attributes for an override, which requires
  /// an exact match or a weakening of constraints.
  AMK_Override,
  /// Merge availability attributes for an implementation of
  /// a protocol requirement.
  AMK_ProtocolImplementation,
};

/// Describes the kind of priority given to an availability attribute.
///
/// The sum of priorities deteremines the final priority of the attribute.
/// The final priority determines how the attribute will be merged.
/// An attribute with a lower priority will always remove higher priority
/// attributes for the specified platform when it is being applied. An
/// attribute with a higher priority will not be applied if the declaration
/// already has an availability attribute with a lower priority for the
/// specified platform. The final prirority values are not expected to match
/// the values in this enumeration, but instead should be treated as a plain
/// integer value. This enumeration just names the priority weights that are
/// used to calculate that final vaue.
enum AvailabilityPriority : int {
  /// The availability attribute was specified explicitly next to the
  /// declaration.
  AP_Explicit = 0,

  /// The availability attribute was applied using '#pragma clang attribute'.
  AP_PragmaClangAttribute = 1,

  /// The availability attribute for a specific platform was inferred from
  /// an availability attribute for another platform.
  AP_InferredFromOtherPlatform = 2
};

/// Attribute merging methods. Return true if a new attribute was added.
AvailabilityAttr *mergeAvailabilityAttr(
    NamedDecl *D, SourceRange Range, IdentifierInfo *Platform, bool Implicit,
    VersionTuple Introduced, VersionTuple Deprecated, VersionTuple Obsoleted,
    bool IsUnavailable, StringRef Message, bool IsStrict,
    StringRef Replacement, AvailabilityMergeKind AMK, int Priority,
    unsigned AttrSpellingListIndex);
TypeVisibilityAttr *mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
                                     TypeVisibilityAttr::VisibilityType Vis,
                                            unsigned AttrSpellingListIndex);
VisibilityAttr *mergeVisibilityAttr(Decl *D, SourceRange Range,
                                    VisibilityAttr::VisibilityType Vis,
                                    unsigned AttrSpellingListIndex);
UuidAttr *mergeUuidAttr(Decl *D, SourceRange Range,
                        unsigned AttrSpellingListIndex, StringRef Uuid);
DLLImportAttr *mergeDLLImportAttr(Decl *D, SourceRange Range,
                                  unsigned AttrSpellingListIndex);
DLLExportAttr *mergeDLLExportAttr(Decl *D, SourceRange Range,
                                  unsigned AttrSpellingListIndex);
MSInheritanceAttr *
mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
                       unsigned AttrSpellingListIndex,
                       MSInheritanceAttr::Spelling SemanticSpelling);
FormatAttr *mergeFormatAttr(Decl *D, SourceRange Range,
                            IdentifierInfo *Format, int FormatIdx,
                            int FirstArg, unsigned AttrSpellingListIndex);
SectionAttr *mergeSectionAttr(Decl *D, SourceRange Range, StringRef Name,
                              unsigned AttrSpellingListIndex);
CodeSegAttr *mergeCodeSegAttr(Decl *D, SourceRange Range, StringRef Name,
                              unsigned AttrSpellingListIndex);
AlwaysInlineAttr *mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
                                        IdentifierInfo *Ident,
                                        unsigned AttrSpellingListIndex);
MinSizeAttr *mergeMinSizeAttr(Decl *D, SourceRange Range,
                              unsigned AttrSpellingListIndex);
NoSpeculativeLoadHardeningAttr *
mergeNoSpeculativeLoadHardeningAttr(Decl *D,
                                    const NoSpeculativeLoadHardeningAttr &AL);
SpeculativeLoadHardeningAttr *
mergeSpeculativeLoadHardeningAttr(Decl *D,
                                  const SpeculativeLoadHardeningAttr &AL);
OptimizeNoneAttr *mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
                                        unsigned AttrSpellingListIndex);
InternalLinkageAttr *mergeInternalLinkageAttr(Decl *D, const ParsedAttr &AL);
InternalLinkageAttr *mergeInternalLinkageAttr(Decl *D,
                                              const InternalLinkageAttr &AL);
CommonAttr *mergeCommonAttr(Decl *D, const ParsedAttr &AL);
CommonAttr *mergeCommonAttr(Decl *D, const CommonAttr &AL);

void mergeDeclAttributes(NamedDecl *New, Decl *Old,
                         AvailabilityMergeKind AMK = AMK_Redeclaration);
void MergeTypedefNameDecl(Scope *S, TypedefNameDecl *New,
                          LookupResult &OldDecls);
bool MergeFunctionDecl(FunctionDecl *New, NamedDecl *&Old, Scope *S,
                       bool MergeTypeWithOld);
bool MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
                                  Scope *S, bool MergeTypeWithOld);
void mergeObjCMethodDecls(ObjCMethodDecl *New, ObjCMethodDecl *Old);
void MergeVarDecl(VarDecl *New, LookupResult &Previous);
void MergeVarDeclTypes(VarDecl *New, VarDecl *Old, bool MergeTypeWithOld);
void MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old);
bool checkVarDeclRedefinition(VarDecl *OldDefn, VarDecl *NewDefn);
void notePreviousDefinition(const NamedDecl *Old, SourceLocation New);
bool MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, Scope *S);

// AssignmentAction - This is used by all the assignment diagnostic functions
// to represent what is actually causing the operation
enum AssignmentAction {
  AA_Assigning,
  AA_Passing,
  AA_Returning,
  AA_Converting,
  AA_Initializing,
  AA_Sending,
  AA_Casting,
  AA_Passing_CFAudited
};

/// C++ Overloading.
enum OverloadKind {
  /// This is a legitimate overload: the existing declarations are
  /// functions or function templates with different signatures.
  Ovl_Overload,

  /// This is not an overload because the signature exactly matches
  /// an existing declaration.
  Ovl_Match,

  /// This is not an overload because the lookup results contain a
  /// non-function.
  Ovl_NonFunction
};
OverloadKind CheckOverload(Scope *S,
                           FunctionDecl *New,
                           const LookupResult &OldDecls,
                           NamedDecl *&OldDecl,
                           bool IsForUsingDecl);
bool IsOverload(FunctionDecl *New, FunctionDecl *Old, bool IsForUsingDecl,
                bool ConsiderCudaAttrs = true);

ImplicitConversionSequence
TryImplicitConversion(Expr *From, QualType ToType,
                      bool SuppressUserConversions,
                      bool AllowExplicit,
                      bool InOverloadResolution,
                      bool CStyle,
                      bool AllowObjCWritebackConversion);

bool IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType);
bool IsFloatingPointPromotion(QualType FromType, QualType ToType);
bool IsComplexPromotion(QualType FromType, QualType ToType);
bool IsPointerConversion(Expr *From, QualType FromType, QualType ToType,
                         bool InOverloadResolution,
                         QualType& ConvertedType, bool &IncompatibleObjC);
bool isObjCPointerConversion(QualType FromType, QualType ToType,
                             QualType& ConvertedType, bool &IncompatibleObjC);
bool isObjCWritebackConversion(QualType FromType, QualType ToType,
                               QualType &ConvertedType);
bool IsBlockPointerConversion(QualType FromType, QualType ToType,
                              QualType& ConvertedType);
bool FunctionParamTypesAreEqual(const FunctionProtoType *OldType,
                                const FunctionProtoType *NewType,
                                unsigned *ArgPos = nullptr);
void HandleFunctionTypeMismatch(PartialDiagnostic &PDiag,
                                QualType FromType, QualType ToType);

void maybeExtendBlockObject(ExprResult &E);
CastKind PrepareCastToObjCObjectPointer(ExprResult &E);
bool CheckPointerConversion(Expr *From, QualType ToType,
                            CastKind &Kind,
                            CXXCastPath& BasePath,
                            bool IgnoreBaseAccess,
                            bool Diagnose = true);
bool IsMemberPointerConversion(Expr *From, QualType FromType, QualType ToType,
                               bool InOverloadResolution,
                               QualType &ConvertedType);
bool CheckMemberPointerConversion(Expr *From, QualType ToType,
                                  CastKind &Kind,
                                  CXXCastPath &BasePath,
                                  bool IgnoreBaseAccess);
bool IsQualificationConversion(QualType FromType, QualType ToType,
                               bool CStyle, bool &ObjCLifetimeConversion);
bool IsFunctionConversion(QualType FromType, QualType ToType,
                          QualType &ResultTy);
bool DiagnoseMultipleUserDefinedConversion(Expr *From, QualType ToType);
bool isSameOrCompatibleFunctionType(CanQualType Param, CanQualType Arg);

ExprResult PerformMoveOrCopyInitialization(const InitializedEntity &Entity,
                                           const VarDecl *NRVOCandidate,
                                           QualType ResultType,
                                           Expr *Value,
                                           bool AllowNRVO = true);

bool CanPerformCopyInitialization(const InitializedEntity &Entity,
                                  ExprResult Init);
ExprResult PerformCopyInitialization(const InitializedEntity &Entity,
                                     SourceLocation EqualLoc,
                                     ExprResult Init,
                                     bool TopLevelOfInitList = false,
                                     bool AllowExplicit = false);
ExprResult PerformObjectArgumentInitialization(Expr *From,
                                               NestedNameSpecifier *Qualifier,
                                               NamedDecl *FoundDecl,
                                               CXXMethodDecl *Method);

/// Check that the lifetime of the initializer (and its subobjects) is
/// sufficient for initializing the entity, and perform lifetime extension
/// (when permitted) if not.
void checkInitializerLifetime(const InitializedEntity &Entity, Expr *Init);

ExprResult PerformContextuallyConvertToBool(Expr *From);
ExprResult PerformContextuallyConvertToObjCPointer(Expr *From);

/// Contexts in which a converted constant expression is required.
enum CCEKind {
  CCEK_CaseValue,   ///< Expression in a case label.
  CCEK_Enumerator,  ///< Enumerator value with fixed underlying type.
  CCEK_TemplateArg, ///< Value of a non-type template parameter.
  CCEK_NewExpr,     ///< Constant expression in a noptr-new-declarator.
  CCEK_ConstexprIf, ///< Condition in a constexpr if statement.
  CCEK_ExplicitBool ///< Condition in an explicit(bool) specifier.
};
ExprResult CheckConvertedConstantExpression(Expr *From, QualType T,
                                            llvm::APSInt &Value, CCEKind CCE);
ExprResult CheckConvertedConstantExpression(Expr *From, QualType T,
                                            APValue &Value, CCEKind CCE);

/// Abstract base class used to perform a contextual implicit
/// conversion from an expression to any type passing a filter.
class ContextualImplicitConverter {
public:
  bool Suppress;
  bool SuppressConversion;

  ContextualImplicitConverter(bool Suppress = false,
                              bool SuppressConversion = false)
      : Suppress(Suppress), SuppressConversion(SuppressConversion) {}

  /// Determine whether the specified type is a valid destination type
  /// for this conversion.
  virtual bool match(QualType T) = 0;

  /// Emits a diagnostic complaining that the expression does not have
  /// integral or enumeration type.
  virtual SemaDiagnosticBuilder
  diagnoseNoMatch(Sema &S, SourceLocation Loc, QualType T) = 0;

  /// Emits a diagnostic when the expression has incomplete class type.
  virtual SemaDiagnosticBuilder
  diagnoseIncomplete(Sema &S, SourceLocation Loc, QualType T) = 0;

  /// Emits a diagnostic when the only matching conversion function
  /// is explicit.
  virtual SemaDiagnosticBuilder diagnoseExplicitConv(
      Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;

  /// Emits a note for the explicit conversion function.
  virtual SemaDiagnosticBuilder
  noteExplicitConv(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;

  /// Emits a diagnostic when there are multiple possible conversion
  /// functions.
  virtual SemaDiagnosticBuilder
  diagnoseAmbiguous(Sema &S, SourceLocation Loc, QualType T) = 0;

  /// Emits a note for one of the candidate conversions.
  virtual SemaDiagnosticBuilder
  noteAmbiguous(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;

  /// Emits a diagnostic when we picked a conversion function
  /// (for cases when we are not allowed to pick a conversion function).
  virtual SemaDiagnosticBuilder diagnoseConversion(
      Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;

  virtual ~ContextualImplicitConverter() {}
};

class ICEConvertDiagnoser : public ContextualImplicitConverter {
  bool AllowScopedEnumerations;

public:
  ICEConvertDiagnoser(bool AllowScopedEnumerations,
                      bool Suppress, bool SuppressConversion)
      : ContextualImplicitConverter(Suppress, SuppressConversion),
        AllowScopedEnumerations(AllowScopedEnumerations) {}

  /// Match an integral or (possibly scoped) enumeration type.
  bool match(QualType T) override;

  SemaDiagnosticBuilder
  diagnoseNoMatch(Sema &S, SourceLocation Loc, QualType T) override {
    return diagnoseNotInt(S, Loc, T);
  }

  /// Emits a diagnostic complaining that the expression does not have
  /// integral or enumeration type.
  virtual SemaDiagnosticBuilder
  diagnoseNotInt(Sema &S, SourceLocation Loc, QualType T) = 0;
};

/// Perform a contextual implicit conversion.
ExprResult PerformContextualImplicitConversion(
    SourceLocation Loc, Expr *FromE, ContextualImplicitConverter &Converter);


enum ObjCSubscriptKind {
  OS_Array,
  OS_Dictionary,
  OS_Error
};
ObjCSubscriptKind CheckSubscriptingKind(Expr *FromE);

// Note that LK_String is intentionally after the other literals, as
// this is used for diagnostics logic.
enum ObjCLiteralKind {
  LK_Array,
  LK_Dictionary,
  LK_Numeric,
  LK_Boxed,
  LK_String,
  LK_Block,
  LK_None
};
ObjCLiteralKind CheckLiteralKind(Expr *FromE);

ExprResult PerformObjectMemberConversion(Expr *From,
                                         NestedNameSpecifier *Qualifier,
                                         NamedDecl *FoundDecl,
                                         NamedDecl *Member);

// Members have to be NamespaceDecl* or TranslationUnitDecl*.
// TODO: make this is a typesafe union.
typedef llvm::SmallSetVector<DeclContext   *, 16> AssociatedNamespaceSet;
typedef llvm::SmallSetVector<CXXRecordDecl *, 16> AssociatedClassSet;

using ADLCallKind = CallExpr::ADLCallKind;

void AddOverloadCandidate(FunctionDecl *Function, DeclAccessPair FoundDecl,
                          ArrayRef<Expr *> Args,
                          OverloadCandidateSet &CandidateSet,
                          bool SuppressUserConversions = false,
                          bool PartialOverloading = false,
                          bool AllowExplicit = true,
                          bool AllowExplicitConversion = false,
                          ADLCallKind IsADLCandidate = ADLCallKind::NotADL,
                          ConversionSequenceList EarlyConversions = None);
void AddFunctionCandidates(const UnresolvedSetImpl &Functions,
                    ArrayRef<Expr *> Args,
                    OverloadCandidateSet &CandidateSet,
                    TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
                    bool SuppressUserConversions = false,
                    bool PartialOverloading = false,
                    bool FirstArgumentIsBase = false);
void AddMethodCandidate(DeclAccessPair FoundDecl,
                        QualType ObjectType,
                        Expr::Classification ObjectClassification,
                        ArrayRef<Expr *> Args,
                        OverloadCandidateSet& CandidateSet,
                        bool SuppressUserConversion = false);
void AddMethodCandidate(CXXMethodDecl *Method,
                        DeclAccessPair FoundDecl,
                        CXXRecordDecl *ActingContext, QualType ObjectType,
                        Expr::Classification ObjectClassification,
                        ArrayRef<Expr *> Args,
                        OverloadCandidateSet& CandidateSet,
                        bool SuppressUserConversions = false,
                        bool PartialOverloading = false,
                        ConversionSequenceList EarlyConversions = None);
void AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
                                DeclAccessPair FoundDecl,
                                CXXRecordDecl *ActingContext,
                               TemplateArgumentListInfo *ExplicitTemplateArgs,
                                QualType ObjectType,
                                Expr::Classification ObjectClassification,
                                ArrayRef<Expr *> Args,
                                OverloadCandidateSet& CandidateSet,
                                bool SuppressUserConversions = false,
                                bool PartialOverloading = false);
void AddTemplateOverloadCandidate(
    FunctionTemplateDecl *FunctionTemplate, DeclAccessPair FoundDecl,
    TemplateArgumentListInfo *ExplicitTemplateArgs, ArrayRef<Expr *> Args,
    OverloadCandidateSet &CandidateSet, bool SuppressUserConversions = false,
    bool PartialOverloading = false, bool AllowExplicit = true,
    ADLCallKind IsADLCandidate = ADLCallKind::NotADL);
bool CheckNonDependentConversions(FunctionTemplateDecl *FunctionTemplate,
                                  ArrayRef<QualType> ParamTypes,
                                  ArrayRef<Expr *> Args,
                                  OverloadCandidateSet &CandidateSet,
                                  ConversionSequenceList &Conversions,
                                  bool SuppressUserConversions,
                                  CXXRecordDecl *ActingContext = nullptr,
                                  QualType ObjectType = QualType(),
                                  Expr::Classification
                                      ObjectClassification = {});
void AddConversionCandidate(
    CXXConversionDecl *Conversion, DeclAccessPair FoundDecl,
    CXXRecordDecl *ActingContext, Expr *From, QualType ToType,
    OverloadCandidateSet &CandidateSet, bool AllowObjCConversionOnExplicit,
    bool AllowExplicit, bool AllowResultConversion = true);
void AddTemplateConversionCandidate(
    FunctionTemplateDecl *FunctionTemplate, DeclAccessPair FoundDecl,
    CXXRecordDecl *ActingContext, Expr *From, QualType ToType,
    OverloadCandidateSet &CandidateSet, bool AllowObjCConversionOnExplicit,
    bool AllowExplicit, bool AllowResultConversion = true);
void AddSurrogateCandidate(CXXConversionDecl *Conversion,
                           DeclAccessPair FoundDecl,
                           CXXRecordDecl *ActingContext,
                           const FunctionProtoType *Proto,
                           Expr *Object, ArrayRef<Expr *> Args,
                           OverloadCandidateSet& CandidateSet);
void AddMemberOperatorCandidates(OverloadedOperatorKind Op,
                                 SourceLocation OpLoc, ArrayRef<Expr *> Args,
                                 OverloadCandidateSet& CandidateSet,
                                 SourceRange OpRange = SourceRange());
void AddBuiltinCandidate(QualType *ParamTys, ArrayRef<Expr *> Args,
                         OverloadCandidateSet& CandidateSet,
                         bool IsAssignmentOperator = false,
                         unsigned NumContextualBoolArguments = 0);
void AddBuiltinOperatorCandidates(OverloadedOperatorKind Op,
                                  SourceLocation OpLoc, ArrayRef<Expr *> Args,
                                  OverloadCandidateSet& CandidateSet);
void AddArgumentDependentLookupCandidates(DeclarationName Name,
                                          SourceLocation Loc,
                                          ArrayRef<Expr *> Args,
                              TemplateArgumentListInfo *ExplicitTemplateArgs,
                                          OverloadCandidateSet& CandidateSet,
                                          bool PartialOverloading = false);

// Emit as a 'note' the specific overload candidate
void NoteOverloadCandidate(NamedDecl *Found, FunctionDecl *Fn,
                           QualType DestType = QualType(),
                           bool TakingAddress = false);

// Emit as a series of 'note's all template and non-templates identified by
// the expression Expr
void NoteAllOverloadCandidates(Expr *E, QualType DestType = QualType(),
                               bool TakingAddress = false);

/// Check the enable_if expressions on the given function. Returns the first
/// failing attribute, or NULL if they were all successful.
EnableIfAttr *CheckEnableIf(FunctionDecl *Function, ArrayRef<Expr *> Args,
                            bool MissingImplicitThis = false);

/// Find the failed Boolean condition within a given Boolean
/// constant expression, and describe it with a string.
std::pair<Expr *, std::string> findFailedBooleanCondition(Expr *Cond);

/// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
/// non-ArgDependent DiagnoseIfAttrs.
///
/// Argument-dependent diagnose_if attributes should be checked each time a
/// function is used as a direct callee of a function call.
///
/// Returns true if any errors were emitted.
bool diagnoseArgDependentDiagnoseIfAttrs(const FunctionDecl *Function,
                                         const Expr *ThisArg,
                                         ArrayRef<const Expr *> Args,
                                         SourceLocation Loc);

/// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
/// ArgDependent DiagnoseIfAttrs.
///
/// Argument-independent diagnose_if attributes should be checked on every use
/// of a function.
///
/// Returns true if any errors were emitted.
bool diagnoseArgIndependentDiagnoseIfAttrs(const NamedDecl *ND,
                                           SourceLocation Loc);

/// Returns whether the given function's address can be taken or not,
/// optionally emitting a diagnostic if the address can't be taken.
///
/// Returns false if taking the address of the function is illegal.
bool checkAddressOfFunctionIsAvailable(const FunctionDecl *Function,
                                       bool Complain = false,
                                       SourceLocation Loc = SourceLocation());

// [PossiblyAFunctionType]  -->   [Return]
// NonFunctionType --> NonFunctionType
// R (A) --> R(A)
// R (*)(A) --> R (A)
// R (&)(A) --> R (A)
// R (S::*)(A) --> R (A)
QualType ExtractUnqualifiedFunctionType(QualType PossiblyAFunctionType);

FunctionDecl *
ResolveAddressOfOverloadedFunction(Expr *AddressOfExpr,
                                   QualType TargetType,
                                   bool Complain,
                                   DeclAccessPair &Found,
                                   bool *pHadMultipleCandidates = nullptr);

FunctionDecl *
resolveAddressOfOnlyViableOverloadCandidate(Expr *E,
                                            DeclAccessPair &FoundResult);

bool resolveAndFixAddressOfOnlyViableOverloadCandidate(
    ExprResult &SrcExpr, bool DoFunctionPointerConversion = false);

FunctionDecl *
ResolveSingleFunctionTemplateSpecialization(OverloadExpr *ovl,
                                            bool Complain = false,
                                            DeclAccessPair *Found = nullptr);

bool ResolveAndFixSingleFunctionTemplateSpecialization(
                    ExprResult &SrcExpr,
                    bool DoFunctionPointerConverion = false,
                    bool Complain = false,
                    SourceRange OpRangeForComplaining = SourceRange(),
                    QualType DestTypeForComplaining = QualType(),
                    unsigned DiagIDForComplaining = 0);


Expr *FixOverloadedFunctionReference(Expr *E,
                                     DeclAccessPair FoundDecl,
                                     FunctionDecl *Fn);
ExprResult FixOverloadedFunctionReference(ExprResult,
                                          DeclAccessPair FoundDecl,
                                          FunctionDecl *Fn);

void AddOverloadedCallCandidates(UnresolvedLookupExpr *ULE,
                                 ArrayRef<Expr *> Args,
                                 OverloadCandidateSet &CandidateSet,
                                 bool PartialOverloading = false);

// An enum used to represent the different possible results of building a
// range-based for loop.
enum ForRangeStatus {
  FRS_Success,
  FRS_NoViableFunction,
  FRS_DiagnosticIssued
};

ForRangeStatus BuildForRangeBeginEndCall(SourceLocation Loc,
                                         SourceLocation RangeLoc,
                                         const DeclarationNameInfo &NameInfo,
                                         LookupResult &MemberLookup,
                                         OverloadCandidateSet *CandidateSet,
                                         Expr *Range, ExprResult *CallExpr);

ExprResult BuildOverloadedCallExpr(Scope *S, Expr *Fn,
                                   UnresolvedLookupExpr *ULE,
                                   SourceLocation LParenLoc,
                                   MultiExprArg Args,
                                   SourceLocation RParenLoc,
                                   Expr *ExecConfig,
                                   bool AllowTypoCorrection=true,
                                   bool CalleesAddressIsTaken=false);

bool buildOverloadedCallSet(Scope *S, Expr *Fn, UnresolvedLookupExpr *ULE,
                            MultiExprArg Args, SourceLocation RParenLoc,
                            OverloadCandidateSet *CandidateSet,
                            ExprResult *Result);

ExprResult CreateOverloadedUnaryOp(SourceLocation OpLoc,
                                   UnaryOperatorKind Opc,
                                   const UnresolvedSetImpl &Fns,
                                   Expr *input, bool RequiresADL = true);

ExprResult CreateOverloadedBinOp(SourceLocation OpLoc,
                                 BinaryOperatorKind Opc,
                                 const UnresolvedSetImpl &Fns,
                                 Expr *LHS, Expr *RHS,
                                 bool RequiresADL = true);

ExprResult CreateOverloadedArraySubscriptExpr(SourceLocation LLoc,
                                              SourceLocation RLoc,
                                              Expr *Base,Expr *Idx);

ExprResult
BuildCallToMemberFunction(Scope *S, Expr *MemExpr,
                          SourceLocation LParenLoc,
                          MultiExprArg Args,
                          SourceLocation RParenLoc);
ExprResult
BuildCallToObjectOfClassType(Scope *S, Expr *Object, SourceLocation LParenLoc,
                             MultiExprArg Args,
                             SourceLocation RParenLoc);

ExprResult BuildOverloadedArrowExpr(Scope *S, Expr *Base,
                                    SourceLocation OpLoc,
                                    bool *NoArrowOperatorFound = nullptr);

/// CheckCallReturnType - Checks that a call expression's return type is
/// complete. Returns true on failure. The location passed in is the location
/// that best represents the call.
bool CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
                         CallExpr *CE, FunctionDecl *FD);

/// Helpers for dealing with blocks and functions.
bool CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
                              bool CheckParameterNames);
void CheckCXXDefaultArguments(FunctionDecl *FD);
void CheckExtraCXXDefaultArguments(Declarator &D);
Scope *getNonFieldDeclScope(Scope *S);

/// \name Name lookup
///
/// These routines provide name lookup that is used during semantic
/// analysis to resolve the various kinds of names (identifiers,
/// overloaded operator names, constructor names, etc.) into zero or
/// more declarations within a particular scope. The major entry
/// points are LookupName, which performs unqualified name lookup,
/// and LookupQualifiedName, which performs qualified name lookup.
///
/// All name lookup is performed based on some specific criteria,
/// which specify what names will be visible to name lookup and how
/// far name lookup should work. These criteria are important both
/// for capturing language semantics (certain lookups will ignore
/// certain names, for example) and for performance, since name
/// lookup is often a bottleneck in the compilation of C++. Name
/// lookup criteria is specified via the LookupCriteria enumeration.
///
/// The results of name lookup can vary based on the kind of name
/// lookup performed, the current language, and the translation
/// unit. In C, for example, name lookup will either return nothing
/// (no entity found) or a single declaration. In C++, name lookup
/// can additionally refer to a set of overloaded functions or
/// result in an ambiguity. All of the possible results of name
/// lookup are captured by the LookupResult class, which provides
/// the ability to distinguish among them.
//@{

/// Describes the kind of name lookup to perform.
enum LookupNameKind {
  /// Ordinary name lookup, which finds ordinary names (functions,
  /// variables, typedefs, etc.) in C and most kinds of names
  /// (functions, variables, members, types, etc.) in C++.
  LookupOrdinaryName = 0,
  /// Tag name lookup, which finds the names of enums, classes,
  /// structs, and unions.
  LookupTagName,
  /// Label name lookup.
  LookupLabel,
  /// Member name lookup, which finds the names of
  /// class/struct/union members.
  LookupMemberName,
  /// Look up of an operator name (e.g., operator+) for use with
  /// operator overloading. This lookup is similar to ordinary name
  /// lookup, but will ignore any declarations that are class members.
  LookupOperatorName,
  /// Look up of a name that precedes the '::' scope resolution
  /// operator in C++. This lookup completely ignores operator, object,
  /// function, and enumerator names (C++ [basic.lookup.qual]p1).
  LookupNestedNameSpecifierName,
  /// Look up a namespace name within a C++ using directive or
  /// namespace alias definition, ignoring non-namespace names (C++
  /// [basic.lookup.udir]p1).
  LookupNamespaceName,
  /// Look up all declarations in a scope with the given name,
  /// including resolved using declarations.  This is appropriate
  /// for checking redeclarations for a using declaration.
  LookupUsingDeclName,
  /// Look up an ordinary name that is going to be redeclared as a
  /// name with linkage. This lookup ignores any declarations that
  /// are outside of the current scope unless they have linkage. See
  /// C99 6.2.2p4-5 and C++ [basic.link]p6.
  LookupRedeclarationWithLinkage,
  /// Look up a friend of a local class. This lookup does not look
  /// outside the innermost non-class scope. See C++11 [class.friend]p11.
  LookupLocalFriendName,
  /// Look up the name of an Objective-C protocol.
  LookupObjCProtocolName,
  /// Look up implicit 'self' parameter of an objective-c method.
  LookupObjCImplicitSelfParam,
  /// Look up the name of an OpenMP user-defined reduction operation.
  LookupOMPReductionName,
  /// Look up the name of an OpenMP user-defined mapper.
  LookupOMPMapperName,
  /// Look up any declaration with any name.
  LookupAnyName
};

/// Specifies whether (or how) name lookup is being performed for a
/// redeclaration (vs. a reference).
enum RedeclarationKind {
  /// The lookup is a reference to this name that is not for the
  /// purpose of redeclaring the name.
  NotForRedeclaration = 0,
  /// The lookup results will be used for redeclaration of a name,
  /// if an entity by that name already exists and is visible.
  ForVisibleRedeclaration,
  /// The lookup results will be used for redeclaration of a name
  /// with external linkage; non-visible lookup results with external linkage
  /// may also be found.
  ForExternalRedeclaration
};

RedeclarationKind forRedeclarationInCurContext() {
  // A declaration with an owning module for linkage can never link against
  // anything that is not visible. We don't need to check linkage here; if
  // the context has internal linkage, redeclaration lookup won't find things
  // from other TUs, and we can't safely compute linkage yet in general.
  if (cast<Decl>(CurContext)
          ->getOwningModuleForLinkage(/*IgnoreLinkage*/true))
    return ForVisibleRedeclaration;
  return ForExternalRedeclaration;
}

/// The possible outcomes of name lookup for a literal operator.
enum LiteralOperatorLookupResult {
  /// The lookup resulted in an error.
  LOLR_Error,
  /// The lookup found no match but no diagnostic was issued.
  LOLR_ErrorNoDiagnostic,
  /// The lookup found a single 'cooked' literal operator, which
  /// expects a normal literal to be built and passed to it.
  LOLR_Cooked,
  /// The lookup found a single 'raw' literal operator, which expects
  /// a string literal containing the spelling of the literal token.
  LOLR_Raw,
  /// The lookup found an overload set of literal operator templates,
  /// which expect the characters of the spelling of the literal token to be
  /// passed as a non-type template argument pack.
  LOLR_Template,
  /// The lookup found an overload set of literal operator templates,
  /// which expect the character type and characters of the spelling of the
  /// string literal token to be passed as template arguments.
  LOLR_StringTemplate
};

SpecialMemberOverloadResult LookupSpecialMember(CXXRecordDecl *D,
                                                CXXSpecialMember SM,
                                                bool ConstArg,
                                                bool VolatileArg,
                                                bool RValueThis,
                                                bool ConstThis,
                                                bool VolatileThis);

typedef std::function<void(const TypoCorrection &)> TypoDiagnosticGenerator;
typedef std::function<ExprResult(Sema &, TypoExpr *, TypoCorrection)>
    TypoRecoveryCallback;

3260private:
bool CppLookupName(LookupResult &R, Scope *S);

struct TypoExprState {
  std::unique_ptr<TypoCorrectionConsumer> Consumer;
  TypoDiagnosticGenerator DiagHandler;
  TypoRecoveryCallback RecoveryHandler;
  TypoExprState();
  TypoExprState(TypoExprState &&other) noexcept;
  TypoExprState &operator=(TypoExprState &&other) noexcept;
};

/// The set of unhandled TypoExprs and their associated state.
llvm::MapVector<TypoExpr *, TypoExprState> DelayedTypos;

/// Creates a new TypoExpr AST node.
TypoExpr *createDelayedTypo(std::unique_ptr<TypoCorrectionConsumer> TCC,
                            TypoDiagnosticGenerator TDG,
                            TypoRecoveryCallback TRC);

// The set of known/encountered (unique, canonicalized) NamespaceDecls.
//
// The boolean value will be true to indicate that the namespace was loaded
// from an AST/PCH file, or false otherwise.
llvm::MapVector<NamespaceDecl*, bool> KnownNamespaces;

/// Whether we have already loaded known namespaces from an extenal
/// source.
bool LoadedExternalKnownNamespaces;

/// Helper for CorrectTypo and CorrectTypoDelayed used to create and
/// populate a new TypoCorrectionConsumer. Returns nullptr if typo correction
/// should be skipped entirely.
std::unique_ptr<TypoCorrectionConsumer>
makeTypoCorrectionConsumer(const DeclarationNameInfo &Typo,
                           Sema::LookupNameKind LookupKind, Scope *S,
                           CXXScopeSpec *SS,
                           CorrectionCandidateCallback &CCC,
                           DeclContext *MemberContext, bool EnteringContext,
                           const ObjCObjectPointerType *OPT,
                           bool ErrorRecovery);

3302public:
const TypoExprState &getTypoExprState(TypoExpr *TE) const;

/// Clears the state of the given TypoExpr.
void clearDelayedTypo(TypoExpr *TE);

/// Look up a name, looking for a single declaration.  Return
/// null if the results were absent, ambiguous, or overloaded.
///
/// It is preferable to use the elaborated form and explicitly handle
/// ambiguity and overloaded.
NamedDecl *LookupSingleName(Scope *S, DeclarationName Name,
                            SourceLocation Loc,
                            LookupNameKind NameKind,
                            RedeclarationKind Redecl
                              = NotForRedeclaration);
bool LookupName(LookupResult &R, Scope *S,
                bool AllowBuiltinCreation = false);
bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
                         bool InUnqualifiedLookup = false);
bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
                         CXXScopeSpec &SS);
bool LookupParsedName(LookupResult &R, Scope *S, CXXScopeSpec *SS,
                      bool AllowBuiltinCreation = false,
                      bool EnteringContext = false);
ObjCProtocolDecl *LookupProtocol(IdentifierInfo *II, SourceLocation IdLoc,
                                 RedeclarationKind Redecl
                                   = NotForRedeclaration);
bool LookupInSuper(LookupResult &R, CXXRecordDecl *Class);

void LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S,
                                  QualType T1, QualType T2,
                                  UnresolvedSetImpl &Functions);

LabelDecl *LookupOrCreateLabel(IdentifierInfo *II, SourceLocation IdentLoc,
                               SourceLocation GnuLabelLoc = SourceLocation());

DeclContextLookupResult LookupConstructors(CXXRecordDecl *Class);
CXXConstructorDecl *LookupDefaultConstructor(CXXRecordDecl *Class);
CXXConstructorDecl *LookupCopyingConstructor(CXXRecordDecl *Class,
                                             unsigned Quals);
CXXMethodDecl *LookupCopyingAssignment(CXXRecordDecl *Class, unsigned Quals,
                                       bool RValueThis, unsigned ThisQuals);
CXXConstructorDecl *LookupMovingConstructor(CXXRecordDecl *Class,
                                            unsigned Quals);
CXXMethodDecl *LookupMovingAssignment(CXXRecordDecl *Class, unsigned Quals,
                                      bool RValueThis, unsigned ThisQuals);
CXXDestructorDecl *LookupDestructor(CXXRecordDecl *Class);

bool checkLiteralOperatorId(const CXXScopeSpec &SS, const UnqualifiedId &Id);
LiteralOperatorLookupResult LookupLiteralOperator(Scope *S, LookupResult &R,
                                                  ArrayRef<QualType> ArgTys,
                                                  bool AllowRaw,
                                                  bool AllowTemplate,
                                                  bool AllowStringTemplate,
                                                  bool DiagnoseMissing);
bool isKnownName(StringRef name);

void ArgumentDependentLookup(DeclarationName Name, SourceLocation Loc,
                             ArrayRef<Expr *> Args, ADLResult &Functions);

void LookupVisibleDecls(Scope *S, LookupNameKind Kind,
                        VisibleDeclConsumer &Consumer,
                        bool IncludeGlobalScope = true,
                        bool LoadExternal = true);
void LookupVisibleDecls(DeclContext *Ctx, LookupNameKind Kind,
                        VisibleDeclConsumer &Consumer,
                        bool IncludeGlobalScope = true,
                        bool IncludeDependentBases = false,
                        bool LoadExternal = true);

enum CorrectTypoKind {
  CTK_NonError,     // CorrectTypo used in a non error recovery situation.
  CTK_ErrorRecovery // CorrectTypo used in normal error recovery.
};

TypoCorrection CorrectTypo(const DeclarationNameInfo &Typo,
                           Sema::LookupNameKind LookupKind,
                           Scope *S, CXXScopeSpec *SS,
                           CorrectionCandidateCallback &CCC,
                           CorrectTypoKind Mode,
                           DeclContext *MemberContext = nullptr,
                           bool EnteringContext = false,
                           const ObjCObjectPointerType *OPT = nullptr,
                           bool RecordFailure = true);

TypoExpr *CorrectTypoDelayed(const DeclarationNameInfo &Typo,
                             Sema::LookupNameKind LookupKind, Scope *S,
                             CXXScopeSpec *SS,
                             CorrectionCandidateCallback &CCC,
                             TypoDiagnosticGenerator TDG,
                             TypoRecoveryCallback TRC, CorrectTypoKind Mode,
                             DeclContext *MemberContext = nullptr,
                             bool EnteringContext = false,
                             const ObjCObjectPointerType *OPT = nullptr);

/// Process any TypoExprs in the given Expr and its children,
/// generating diagnostics as appropriate and returning a new Expr if there
/// were typos that were all successfully corrected and ExprError if one or
/// more typos could not be corrected.
///
/// \param E The Expr to check for TypoExprs.
///
/// \param InitDecl A VarDecl to avoid because the Expr being corrected is its
/// initializer.
///
/// \param Filter A function applied to a newly rebuilt Expr to determine if
/// it is an acceptable/usable result from a single combination of typo
/// corrections. As long as the filter returns ExprError, different
/// combinations of corrections will be tried until all are exhausted.
ExprResult
CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl = nullptr,
                          llvm::function_ref<ExprResult(Expr *)> Filter =
                              [](Expr *E) -> ExprResult { return E; });

ExprResult
CorrectDelayedTyposInExpr(Expr *E,
                          llvm::function_ref<ExprResult(Expr *)> Filter) {
  return CorrectDelayedTyposInExpr(E, nullptr, Filter);
}

ExprResult
CorrectDelayedTyposInExpr(ExprResult ER, VarDecl *InitDecl = nullptr,
                          llvm::function_ref<ExprResult(Expr *)> Filter =
                              [](Expr *E) -> ExprResult { return E; }) {
  return ER.isInvalid() ? ER : CorrectDelayedTyposInExpr(ER.get(), Filter);
}

ExprResult
CorrectDelayedTyposInExpr(ExprResult ER,
                          llvm::function_ref<ExprResult(Expr *)> Filter) {
  return CorrectDelayedTyposInExpr(ER, nullptr, Filter);
}

void diagnoseTypo(const TypoCorrection &Correction,
                  const PartialDiagnostic &TypoDiag,
                  bool ErrorRecovery = true);

void diagnoseTypo(const TypoCorrection &Correction,
                  const PartialDiagnostic &TypoDiag,
                  const PartialDiagnostic &PrevNote,
                  bool ErrorRecovery = true);

void MarkTypoCorrectedFunctionDefinition(const NamedDecl *F);

void FindAssociatedClassesAndNamespaces(SourceLocation InstantiationLoc,
                                        ArrayRef<Expr *> Args,
                                 AssociatedNamespaceSet &AssociatedNamespaces,
                                 AssociatedClassSet &AssociatedClasses);

void FilterLookupForScope(LookupResult &R, DeclContext *Ctx, Scope *S,
                          bool ConsiderLinkage, bool AllowInlineNamespace);

bool CheckRedeclarationModuleOwnership(NamedDecl *New, NamedDecl *Old);

void DiagnoseAmbiguousLookup(LookupResult &Result);
//@}

ObjCInterfaceDecl *getObjCInterfaceDecl(IdentifierInfo *&Id,
                                        SourceLocation IdLoc,
                                        bool TypoCorrection = false);
NamedDecl *LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID,
                               Scope *S, bool ForRedeclaration,
                               SourceLocation Loc);
NamedDecl *ImplicitlyDefineFunction(SourceLocation Loc, IdentifierInfo &II,
                                    Scope *S);
void AddKnownFunctionAttributes(FunctionDecl *FD);

// More parsing and symbol table subroutines.

void ProcessPragmaWeak(Scope *S, Decl *D);
// Decl attributes - this routine is the top level dispatcher.
void ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD);
// Helper for delayed processing of attributes.
void ProcessDeclAttributeDelayed(Decl *D,
                                 const ParsedAttributesView &AttrList);
void ProcessDeclAttributeList(Scope *S, Decl *D, const ParsedAttributesView &AL,
                           bool IncludeCXX11Attributes = true);
bool ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
                                 const ParsedAttributesView &AttrList);

void checkUnusedDeclAttributes(Declarator &D);

/// Determine if type T is a valid subject for a nonnull and similar
/// attributes. By default, we look through references (the behavior used by
/// nonnull), but if the second parameter is true, then we treat a reference
/// type as valid.
bool isValidPointerAttrType(QualType T, bool RefOkay = false);

bool CheckRegparmAttr(const ParsedAttr &attr, unsigned &value);
bool CheckCallingConvAttr(const ParsedAttr &attr, CallingConv &CC,
                          const FunctionDecl *FD = nullptr);
bool CheckAttrTarget(const ParsedAttr &CurrAttr);
bool CheckAttrNoArgs(const ParsedAttr &CurrAttr);
bool checkStringLiteralArgumentAttr(const ParsedAttr &Attr, unsigned ArgNum,
                                    StringRef &Str,
                                    SourceLocation *ArgLocation = nullptr);
bool checkSectionName(SourceLocation LiteralLoc, StringRef Str);
bool checkTargetAttr(SourceLocation LiteralLoc, StringRef Str);
bool checkMSInheritanceAttrOnDefinition(
    CXXRecordDecl *RD, SourceRange Range, bool BestCase,
    MSInheritanceAttr::Spelling SemanticSpelling);

void CheckAlignasUnderalignment(Decl *D);

/// Adjust the calling convention of a method to be the ABI default if it
/// wasn't specified explicitly.  This handles method types formed from
/// function type typedefs and typename template arguments.
void adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor,
                            SourceLocation Loc);

// Check if there is an explicit attribute, but only look through parens.
// The intent is to look for an attribute on the current declarator, but not
// one that came from a typedef.
bool hasExplicitCallingConv(QualType T);

/// Get the outermost AttributedType node that sets a calling convention.
/// Valid types should not have multiple attributes with different CCs.
const AttributedType *getCallingConvAttributedType(QualType T) const;

/// Stmt attributes - this routine is the top level dispatcher.
StmtResult ProcessStmtAttributes(Stmt *Stmt,
                                 const ParsedAttributesView &Attrs,
                                 SourceRange Range);

void WarnConflictingTypedMethods(ObjCMethodDecl *Method,
                                 ObjCMethodDecl *MethodDecl,
                                 bool IsProtocolMethodDecl);

void CheckConflictingOverridingMethod(ObjCMethodDecl *Method,
                                 ObjCMethodDecl *Overridden,
                                 bool IsProtocolMethodDecl);

/// WarnExactTypedMethods - This routine issues a warning if method
/// implementation declaration matches exactly that of its declaration.
void WarnExactTypedMethods(ObjCMethodDecl *Method,
                           ObjCMethodDecl *MethodDecl,
                           bool IsProtocolMethodDecl);

typedef llvm::SmallPtrSet<Selector, 8> SelectorSet;

/// CheckImplementationIvars - This routine checks if the instance variables
/// listed in the implelementation match those listed in the interface.
void CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
                              ObjCIvarDecl **Fields, unsigned nIvars,
                              SourceLocation Loc);

/// ImplMethodsVsClassMethods - This is main routine to warn if any method
/// remains unimplemented in the class or category \@implementation.
void ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl,
                               ObjCContainerDecl* IDecl,
                               bool IncompleteImpl = false);

/// DiagnoseUnimplementedProperties - This routine warns on those properties
/// which must be implemented by this implementation.
void DiagnoseUnimplementedProperties(Scope *S, ObjCImplDecl* IMPDecl,
                                     ObjCContainerDecl *CDecl,
                                     bool SynthesizeProperties);

/// Diagnose any null-resettable synthesized setters.
void diagnoseNullResettableSynthesizedSetters(const ObjCImplDecl *impDecl);

/// DefaultSynthesizeProperties - This routine default synthesizes all
/// properties which must be synthesized in the class's \@implementation.
void DefaultSynthesizeProperties(Scope *S, ObjCImplDecl *IMPDecl,
                                 ObjCInterfaceDecl *IDecl,
                                 SourceLocation AtEnd);
void DefaultSynthesizeProperties(Scope *S, Decl *D, SourceLocation AtEnd);

/// IvarBacksCurrentMethodAccessor - This routine returns 'true' if 'IV' is
/// an ivar synthesized for 'Method' and 'Method' is a property accessor
/// declared in class 'IFace'.
bool IvarBacksCurrentMethodAccessor(ObjCInterfaceDecl *IFace,
                                    ObjCMethodDecl *Method, ObjCIvarDecl *IV);

/// DiagnoseUnusedBackingIvarInAccessor - Issue an 'unused' warning if ivar which
/// backs the property is not used in the property's accessor.
void DiagnoseUnusedBackingIvarInAccessor(Scope *S,
                                         const ObjCImplementationDecl *ImplD);

/// GetIvarBackingPropertyAccessor - If method is a property setter/getter and
/// it property has a backing ivar, returns this ivar; otherwise, returns NULL.
/// It also returns ivar's property on success.
ObjCIvarDecl *GetIvarBackingPropertyAccessor(const ObjCMethodDecl *Method,
                                             const ObjCPropertyDecl *&PDecl) const;

/// Called by ActOnProperty to handle \@property declarations in
/// class extensions.
ObjCPropertyDecl *HandlePropertyInClassExtension(Scope *S,
                    SourceLocation AtLoc,
                    SourceLocation LParenLoc,
                    FieldDeclarator &FD,
                    Selector GetterSel,
                    SourceLocation GetterNameLoc,
                    Selector SetterSel,
                    SourceLocation SetterNameLoc,
                    const bool isReadWrite,
                    unsigned &Attributes,
                    const unsigned AttributesAsWritten,
                    QualType T,
                    TypeSourceInfo *TSI,
                    tok::ObjCKeywordKind MethodImplKind);

/// Called by ActOnProperty and HandlePropertyInClassExtension to
/// handle creating the ObjcPropertyDecl for a category or \@interface.
ObjCPropertyDecl *CreatePropertyDecl(Scope *S,
                                     ObjCContainerDecl *CDecl,
                                     SourceLocation AtLoc,
                                     SourceLocation LParenLoc,
                                     FieldDeclarator &FD,
                                     Selector GetterSel,
                                     SourceLocation GetterNameLoc,
                                     Selector SetterSel,
                                     SourceLocation SetterNameLoc,
                                     const bool isReadWrite,
                                     const unsigned Attributes,
                                     const unsigned AttributesAsWritten,
                                     QualType T,
                                     TypeSourceInfo *TSI,
                                     tok::ObjCKeywordKind MethodImplKind,
                                     DeclContext *lexicalDC = nullptr);

/// AtomicPropertySetterGetterRules - This routine enforces the rule (via
/// warning) when atomic property has one but not the other user-declared
/// setter or getter.
void AtomicPropertySetterGetterRules(ObjCImplDecl* IMPDecl,
                                     ObjCInterfaceDecl* IDecl);

void DiagnoseOwningPropertyGetterSynthesis(const ObjCImplementationDecl *D);

void DiagnoseMissingDesignatedInitOverrides(
                                        const ObjCImplementationDecl *ImplD,
                                        const ObjCInterfaceDecl *IFD);

void DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, ObjCInterfaceDecl *SID);

enum MethodMatchStrategy {
  MMS_loose,
  MMS_strict
};

/// MatchTwoMethodDeclarations - Checks if two methods' type match and returns
/// true, or false, accordingly.
bool MatchTwoMethodDeclarations(const ObjCMethodDecl *Method,
                                const ObjCMethodDecl *PrevMethod,
                                MethodMatchStrategy strategy = MMS_strict);

/// MatchAllMethodDeclarations - Check methods declaraed in interface or
/// or protocol against those declared in their implementations.
void MatchAllMethodDeclarations(const SelectorSet &InsMap,
                                const SelectorSet &ClsMap,
                                SelectorSet &InsMapSeen,
                                SelectorSet &ClsMapSeen,
                                ObjCImplDecl* IMPDecl,
                                ObjCContainerDecl* IDecl,
                                bool &IncompleteImpl,
                                bool ImmediateClass,
                                bool WarnCategoryMethodImpl=false);

/// CheckCategoryVsClassMethodMatches - Checks that methods implemented in
/// category matches with those implemented in its primary class and
/// warns each time an exact match is found.
void CheckCategoryVsClassMethodMatches(ObjCCategoryImplDecl *CatIMP);

/// Add the given method to the list of globally-known methods.
void addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method);

3669private:
/// AddMethodToGlobalPool - Add an instance or factory method to the global
/// pool. See descriptoin of AddInstanceMethodToGlobalPool.
void AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, bool instance);

/// LookupMethodInGlobalPool - Returns the instance or factory method and
/// optionally warns if there are multiple signatures.
ObjCMethodDecl *LookupMethodInGlobalPool(Selector Sel, SourceRange R,
                                         bool receiverIdOrClass,
                                         bool instance);

3680public:
/// - Returns instance or factory methods in global method pool for
/// given selector. It checks the desired kind first, if none is found, and
/// parameter checkTheOther is set, it then checks the other kind. If no such
/// method or only one method is found, function returns false; otherwise, it
/// returns true.
bool
CollectMultipleMethodsInGlobalPool(Selector Sel,
                                   SmallVectorImpl<ObjCMethodDecl*>& Methods,
                                   bool InstanceFirst, bool CheckTheOther,
                                   const ObjCObjectType *TypeBound = nullptr);

bool
AreMultipleMethodsInGlobalPool(Selector Sel, ObjCMethodDecl *BestMethod,
                               SourceRange R, bool receiverIdOrClass,
                               SmallVectorImpl<ObjCMethodDecl*>& Methods);

void
DiagnoseMultipleMethodInGlobalPool(SmallVectorImpl<ObjCMethodDecl*> &Methods,
                                   Selector Sel, SourceRange R,
                                   bool receiverIdOrClass);

3702private:
/// - Returns a selector which best matches given argument list or
/// nullptr if none could be found
ObjCMethodDecl *SelectBestMethod(Selector Sel, MultiExprArg Args,
                                 bool IsInstance,
                                 SmallVectorImpl<ObjCMethodDecl*>& Methods);


/// Record the typo correction failure and return an empty correction.
TypoCorrection FailedCorrection(IdentifierInfo *Typo, SourceLocation TypoLoc,
                                bool RecordFailure = true) {
  if (RecordFailure)
    TypoCorrectionFailures[Typo].insert(TypoLoc);
  return TypoCorrection();
}

3718public:
/// AddInstanceMethodToGlobalPool - All instance methods in a translation
/// unit are added to a global pool. This allows us to efficiently associate
/// a selector with a method declaraation for purposes of typechecking
/// messages sent to "id" (where the class of the object is unknown).
void AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
  AddMethodToGlobalPool(Method, impl, /*instance*/true);
}

/// AddFactoryMethodToGlobalPool - Same as above, but for factory methods.
void AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
  AddMethodToGlobalPool(Method, impl, /*instance*/false);
}

/// AddAnyMethodToGlobalPool - Add any method, instance or factory to global
/// pool.
void AddAnyMethodToGlobalPool(Decl *D);

/// LookupInstanceMethodInGlobalPool - Returns the method and warns if
/// there are multiple signatures.
ObjCMethodDecl *LookupInstanceMethodInGlobalPool(Selector Sel, SourceRange R,
                                                 bool receiverIdOrClass=false) {
  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
                                  /*instance*/true);
}

/// LookupFactoryMethodInGlobalPool - Returns the method and warns if
/// there are multiple signatures.
ObjCMethodDecl *LookupFactoryMethodInGlobalPool(Selector Sel, SourceRange R,
                                                bool receiverIdOrClass=false) {
  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
                                  /*instance*/false);
}

const ObjCMethodDecl *SelectorsForTypoCorrection(Selector Sel,
                            QualType ObjectType=QualType());
/// LookupImplementedMethodInGlobalPool - Returns the method which has an
/// implementation.
ObjCMethodDecl *LookupImplementedMethodInGlobalPool(Selector Sel);

/// CollectIvarsToConstructOrDestruct - Collect those ivars which require
/// initialization.
void CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI,
                                SmallVectorImpl<ObjCIvarDecl*> &Ivars);

//===--------------------------------------------------------------------===//
// Statement Parsing Callbacks: SemaStmt.cpp.
3765public:
class FullExprArg {
public:
  FullExprArg() : E(nullptr) { }
  FullExprArg(Sema &actions) : E(nullptr) { }

  ExprResult release() {
    return E;
  }

  Expr *get() const { return E; }

  Expr *operator->() {
    return E;
  }

private:
  // FIXME: No need to make the entire Sema class a friend when it's just
  // Sema::MakeFullExpr that needs access to the constructor below.
  friend class Sema;

  explicit FullExprArg(Expr *expr) : E(expr) {}

  Expr *E;
};

FullExprArg MakeFullExpr(Expr *Arg) {
  return MakeFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation());
}
FullExprArg MakeFullExpr(Expr *Arg, SourceLocation CC) {
  return FullExprArg(
      ActOnFinishFullExpr(Arg, CC, /*DiscardedValue*/ false).get());
}
FullExprArg MakeFullDiscardedValueExpr(Expr *Arg) {
  ExprResult FE =
      ActOnFinishFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation(),
                          /*DiscardedValue*/ true);
  return FullExprArg(FE.get());
}

StmtResult ActOnExprStmt(ExprResult Arg, bool DiscardedValue = true);
StmtResult ActOnExprStmtError();

StmtResult ActOnNullStmt(SourceLocation SemiLoc,
                         bool HasLeadingEmptyMacro = false);

void ActOnStartOfCompoundStmt(bool IsStmtExpr);
void ActOnFinishOfCompoundStmt();
StmtResult ActOnCompoundStmt(SourceLocation L, SourceLocation R,
                             ArrayRef<Stmt *> Elts, bool isStmtExpr);

/// A RAII object to enter scope of a compound statement.
class CompoundScopeRAII {
public:
  CompoundScopeRAII(Sema &S, bool IsStmtExpr = false) : S(S) {
    S.ActOnStartOfCompoundStmt(IsStmtExpr);
  }

  ~CompoundScopeRAII() {
    S.ActOnFinishOfCompoundStmt();
  }

private:
  Sema &S;
};

/// An RAII helper that pops function a function scope on exit.
struct FunctionScopeRAII {
  Sema &S;
  bool Active;
  FunctionScopeRAII(Sema &S) : S(S), Active(true) {}
  ~FunctionScopeRAII() {
    if (Active)
      S.PopFunctionScopeInfo();
  }
  void disable() { Active = false; }
};

StmtResult ActOnDeclStmt(DeclGroupPtrTy Decl,
                                 SourceLocation StartLoc,
                                 SourceLocation EndLoc);
void ActOnForEachDeclStmt(DeclGroupPtrTy Decl);
StmtResult ActOnForEachLValueExpr(Expr *E);
ExprResult ActOnCaseExpr(SourceLocation CaseLoc, ExprResult Val);
StmtResult ActOnCaseStmt(SourceLocation CaseLoc, ExprResult LHS,
                         SourceLocation DotDotDotLoc, ExprResult RHS,
                         SourceLocation ColonLoc);
void ActOnCaseStmtBody(Stmt *CaseStmt, Stmt *SubStmt);

StmtResult ActOnDefaultStmt(SourceLocation DefaultLoc,
                                    SourceLocation ColonLoc,
                                    Stmt *SubStmt, Scope *CurScope);
StmtResult ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl,
                          SourceLocation ColonLoc, Stmt *SubStmt);

StmtResult ActOnAttributedStmt(SourceLocation AttrLoc,
                               ArrayRef<const Attr*> Attrs,
                               Stmt *SubStmt);

class ConditionResult;
StmtResult ActOnIfStmt(SourceLocation IfLoc, bool IsConstexpr,
                       Stmt *InitStmt,
                       ConditionResult Cond, Stmt *ThenVal,
                       SourceLocation ElseLoc, Stmt *ElseVal);
StmtResult BuildIfStmt(SourceLocation IfLoc, bool IsConstexpr,
                       Stmt *InitStmt,
                       ConditionResult Cond, Stmt *ThenVal,
                       SourceLocation ElseLoc, Stmt *ElseVal);
StmtResult ActOnStartOfSwitchStmt(SourceLocation SwitchLoc,
                                  Stmt *InitStmt,
                                  ConditionResult Cond);
StmtResult ActOnFinishSwitchStmt(SourceLocation SwitchLoc,
                                         Stmt *Switch, Stmt *Body);
StmtResult ActOnWhileStmt(SourceLocation WhileLoc, ConditionResult Cond,
                          Stmt *Body);
StmtResult ActOnDoStmt(SourceLocation DoLoc, Stmt *Body,
                       SourceLocation WhileLoc, SourceLocation CondLParen,
                       Expr *Cond, SourceLocation CondRParen);

StmtResult ActOnForStmt(SourceLocation ForLoc,
                        SourceLocation LParenLoc,
                        Stmt *First,
                        ConditionResult Second,
                        FullExprArg Third,
                        SourceLocation RParenLoc,
                        Stmt *Body);
ExprResult CheckObjCForCollectionOperand(SourceLocation forLoc,
                                         Expr *collection);
StmtResult ActOnObjCForCollectionStmt(SourceLocation ForColLoc,
                                      Stmt *First, Expr *collection,
                                      SourceLocation RParenLoc);
StmtResult FinishObjCForCollectionStmt(Stmt *ForCollection, Stmt *Body);

enum BuildForRangeKind {
  /// Initial building of a for-range statement.
  BFRK_Build,
  /// Instantiation or recovery rebuild of a for-range statement. Don't
  /// attempt any typo-correction.
  BFRK_Rebuild,
  /// Determining whether a for-range statement could be built. Avoid any
  /// unnecessary or irreversible actions.
  BFRK_Check
};

StmtResult ActOnCXXForRangeStmt(Scope *S, SourceLocation ForLoc,
                                SourceLocation CoawaitLoc,
                                Stmt *InitStmt,
                                Stmt *LoopVar,
                                SourceLocation ColonLoc, Expr *Collection,
                                SourceLocation RParenLoc,
                                BuildForRangeKind Kind);
StmtResult BuildCXXForRangeStmt(SourceLocation ForLoc,
                                SourceLocation CoawaitLoc,
                                Stmt *InitStmt,
                                SourceLocation ColonLoc,
                                Stmt *RangeDecl, Stmt *Begin, Stmt *End,
                                Expr *Cond, Expr *Inc,
                                Stmt *LoopVarDecl,
                                SourceLocation RParenLoc,
                                BuildForRangeKind Kind);
StmtResult FinishCXXForRangeStmt(Stmt *ForRange, Stmt *Body);

StmtResult ActOnGotoStmt(SourceLocation GotoLoc,
                         SourceLocation LabelLoc,
                         LabelDecl *TheDecl);
StmtResult ActOnIndirectGotoStmt(SourceLocation GotoLoc,
                                 SourceLocation StarLoc,
                                 Expr *DestExp);
StmtResult ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope);
StmtResult ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope);

void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
                              CapturedRegionKind Kind, unsigned NumParams);
typedef std::pair<StringRef, QualType> CapturedParamNameType;
void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
                              CapturedRegionKind Kind,
                              ArrayRef<CapturedParamNameType> Params);
StmtResult ActOnCapturedRegionEnd(Stmt *S);
void ActOnCapturedRegionError();
RecordDecl *CreateCapturedStmtRecordDecl(CapturedDecl *&CD,
                                         SourceLocation Loc,
                                         unsigned NumParams);

enum CopyElisionSemanticsKind {
  CES_Strict = 0,
  CES_AllowParameters = 1,
  CES_AllowDifferentTypes = 2,
  CES_AllowExceptionVariables = 4,
  CES_FormerDefault = (CES_AllowParameters),
  CES_Default = (CES_AllowParameters | CES_AllowDifferentTypes),
  CES_AsIfByStdMove = (CES_AllowParameters | CES_AllowDifferentTypes |
                       CES_AllowExceptionVariables),
};

VarDecl *getCopyElisionCandidate(QualType ReturnType, Expr *E,
                                 CopyElisionSemanticsKind CESK);
bool isCopyElisionCandidate(QualType ReturnType, const VarDecl *VD,
                            CopyElisionSemanticsKind CESK);

StmtResult ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp,
                           Scope *CurScope);
StmtResult BuildReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);
StmtResult ActOnCapScopeReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);

StmtResult ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
                           bool IsVolatile, unsigned NumOutputs,
                           unsigned NumInputs, IdentifierInfo **Names,
                           MultiExprArg Constraints, MultiExprArg Exprs,
                           Expr *AsmString, MultiExprArg Clobbers,
                           SourceLocation RParenLoc);

void FillInlineAsmIdentifierInfo(Expr *Res,
                                 llvm::InlineAsmIdentifierInfo &Info);
ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS,
                                     SourceLocation TemplateKWLoc,
                                     UnqualifiedId &Id,
                                     bool IsUnevaluatedContext);
bool LookupInlineAsmField(StringRef Base, StringRef Member,
                          unsigned &Offset, SourceLocation AsmLoc);
ExprResult LookupInlineAsmVarDeclField(Expr *RefExpr, StringRef Member,
                                       SourceLocation AsmLoc);
StmtResult ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
                          ArrayRef<Token> AsmToks,
                          StringRef AsmString,
                          unsigned NumOutputs, unsigned NumInputs,
                          ArrayRef<StringRef> Constraints,
                          ArrayRef<StringRef> Clobbers,
                          ArrayRef<Expr*> Exprs,
                          SourceLocation EndLoc);
LabelDecl *GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
                                 SourceLocation Location,
                                 bool AlwaysCreate);

VarDecl *BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType ExceptionType,
                                SourceLocation StartLoc,
                                SourceLocation IdLoc, IdentifierInfo *Id,
                                bool Invalid = false);

Decl *ActOnObjCExceptionDecl(Scope *S, Declarator &D);

StmtResult ActOnObjCAtCatchStmt(SourceLocation AtLoc, SourceLocation RParen,
                                Decl *Parm, Stmt *Body);

StmtResult ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body);

StmtResult ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try,
                              MultiStmtArg Catch, Stmt *Finally);

StmtResult BuildObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw);
StmtResult ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw,
                                Scope *CurScope);
ExprResult ActOnObjCAtSynchronizedOperand(SourceLocation atLoc,
                                          Expr *operand);
StmtResult ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc,
                                       Expr *SynchExpr,
                                       Stmt *SynchBody);

StmtResult ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body);

VarDecl *BuildExceptionDeclaration(Scope *S, TypeSourceInfo *TInfo,
                                   SourceLocation StartLoc,
                                   SourceLocation IdLoc,
                                   IdentifierInfo *Id);

Decl *ActOnExceptionDeclarator(Scope *S, Declarator &D);

StmtResult ActOnCXXCatchBlock(SourceLocation CatchLoc,
                              Decl *ExDecl, Stmt *HandlerBlock);
StmtResult ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock,
                            ArrayRef<Stmt *> Handlers);

StmtResult ActOnSEHTryBlock(bool IsCXXTry, // try (true) or __try (false) ?
                            SourceLocation TryLoc, Stmt *TryBlock,
                            Stmt *Handler);
StmtResult ActOnSEHExceptBlock(SourceLocation Loc,
                               Expr *FilterExpr,
                               Stmt *Block);
void ActOnStartSEHFinallyBlock();
void ActOnAbortSEHFinallyBlock();
StmtResult ActOnFinishSEHFinallyBlock(SourceLocation Loc, Stmt *Block);
StmtResult ActOnSEHLeaveStmt(SourceLocation Loc, Scope *CurScope);

void DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock);

bool ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const;

/// If it's a file scoped decl that must warn if not used, keep track
/// of it.
void MarkUnusedFileScopedDecl(const DeclaratorDecl *D);

/// DiagnoseUnusedExprResult - If the statement passed in is an expression
/// whose result is unused, warn.
void DiagnoseUnusedExprResult(const Stmt *S);
void DiagnoseUnusedNestedTypedefs(const RecordDecl *D);
void DiagnoseUnusedDecl(const NamedDecl *ND);

/// Emit \p DiagID if statement located on \p StmtLoc has a suspicious null
/// statement as a \p Body, and it is located on the same line.
///
/// This helps prevent bugs due to typos, such as:
///     if (condition);
///       do_stuff();
void DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
                           const Stmt *Body,
                           unsigned DiagID);

/// Warn if a for/while loop statement \p S, which is followed by
/// \p PossibleBody, has a suspicious null statement as a body.
void DiagnoseEmptyLoopBody(const Stmt *S,
                           const Stmt *PossibleBody);

/// Warn if a value is moved to itself.
void DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
                      SourceLocation OpLoc);

/// Warn if we're implicitly casting from a _Nullable pointer type to a
/// _Nonnull one.
void diagnoseNullableToNonnullConversion(QualType DstType, QualType SrcType,
                                         SourceLocation Loc);

/// Warn when implicitly casting 0 to nullptr.
void diagnoseZeroToNullptrConversion(CastKind Kind, const Expr *E);

ParsingDeclState PushParsingDeclaration(sema::DelayedDiagnosticPool &pool) {
  return DelayedDiagnostics.push(pool);
}
void PopParsingDeclaration(ParsingDeclState state, Decl *decl);

typedef ProcessingContextState ParsingClassState;
ParsingClassState PushParsingClass() {
  return DelayedDiagnostics.pushUndelayed();
}
void PopParsingClass(ParsingClassState state) {
  DelayedDiagnostics.popUndelayed(state);
}

void redelayDiagnostics(sema::DelayedDiagnosticPool &pool);

void DiagnoseAvailabilityOfDecl(NamedDecl *D, ArrayRef<SourceLocation> Locs,
                                const ObjCInterfaceDecl *UnknownObjCClass,
                                bool ObjCPropertyAccess,
                                bool AvoidPartialAvailabilityChecks = false,
                                ObjCInterfaceDecl *ClassReceiver = nullptr);

bool makeUnavailableInSystemHeader(SourceLocation loc,
                                   UnavailableAttr::ImplicitReason reason);

/// Issue any -Wunguarded-availability warnings in \c FD
void DiagnoseUnguardedAvailabilityViolations(Decl *FD);

//===--------------------------------------------------------------------===//
// Expression Parsing Callbacks: SemaExpr.cpp.

bool CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid);
bool DiagnoseUseOfDecl(NamedDecl *D, ArrayRef<SourceLocation> Locs,
                       const ObjCInterfaceDecl *UnknownObjCClass = nullptr,
                       bool ObjCPropertyAccess = false,
                       bool AvoidPartialAvailabilityChecks = false,
                       ObjCInterfaceDecl *ClassReciever = nullptr);
void NoteDeletedFunction(FunctionDecl *FD);
void NoteDeletedInheritingConstructor(CXXConstructorDecl *CD);
bool DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *PD,
                                      ObjCMethodDecl *Getter,
                                      SourceLocation Loc);
void DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
                           ArrayRef<Expr *> Args);

void PushExpressionEvaluationContext(
    ExpressionEvaluationContext NewContext, Decl *LambdaContextDecl = nullptr,
    ExpressionEvaluationContextRecord::ExpressionKind Type =
        ExpressionEvaluationContextRecord::EK_Other);
enum ReuseLambdaContextDecl_t { ReuseLambdaContextDecl };
void PushExpressionEvaluationContext(
    ExpressionEvaluationContext NewContext, ReuseLambdaContextDecl_t,
    ExpressionEvaluationContextRecord::ExpressionKind Type =
        ExpressionEvaluationContextRecord::EK_Other);
void PopExpressionEvaluationContext();

void DiscardCleanupsInEvaluationContext();

ExprResult TransformToPotentiallyEvaluated(Expr *E);
ExprResult HandleExprEvaluationContextForTypeof(Expr *E);

ExprResult ActOnConstantExpression(ExprResult Res);

// Functions for marking a declaration referenced.  These functions also
// contain the relevant logic for marking if a reference to a function or
// variable is an odr-use (in the C++11 sense).  There are separate variants
// for expressions referring to a decl; these exist because odr-use marking
// needs to be delayed for some constant variables when we build one of the
// named expressions.
//
// MightBeOdrUse indicates whether the use could possibly be an odr-use, and
// should usually be true. This only needs to be set to false if the lack of
// odr-use cannot be determined from the current context (for instance,
// because the name denotes a virtual function and was written without an
// explicit nested-name-specifier).
void MarkAnyDeclReferenced(SourceLocation Loc, Decl *D, bool MightBeOdrUse);
void MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
                            bool MightBeOdrUse = true);
void MarkVariableReferenced(SourceLocation Loc, VarDecl *Var);
void MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base = nullptr);
void MarkMemberReferenced(MemberExpr *E);

void UpdateMarkingForLValueToRValue(Expr *E);
void CleanupVarDeclMarking();

enum TryCaptureKind {
  TryCapture_Implicit, TryCapture_ExplicitByVal, TryCapture_ExplicitByRef
};

/// Try to capture the given variable.
///
/// \param Var The variable to capture.
///
/// \param Loc The location at which the capture occurs.
///
/// \param Kind The kind of capture, which may be implicit (for either a
/// block or a lambda), or explicit by-value or by-reference (for a lambda).
///
/// \param EllipsisLoc The location of the ellipsis, if one is provided in
/// an explicit lambda capture.
///
/// \param BuildAndDiagnose Whether we are actually supposed to add the
/// captures or diagnose errors. If false, this routine merely check whether
/// the capture can occur without performing the capture itself or complaining
/// if the variable cannot be captured.
///
/// \param CaptureType Will be set to the type of the field used to capture
/// this variable in the innermost block or lambda. Only valid when the
/// variable can be captured.
///
/// \param DeclRefType Will be set to the type of a reference to the capture
/// from within the current scope. Only valid when the variable can be
/// captured.
///
/// \param FunctionScopeIndexToStopAt If non-null, it points to the index
/// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
/// This is useful when enclosing lambdas must speculatively capture
/// variables that may or may not be used in certain specializations of
/// a nested generic lambda.
///
/// \returns true if an error occurred (i.e., the variable cannot be
/// captured) and false if the capture succeeded.
bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc, TryCaptureKind Kind,
                        SourceLocation EllipsisLoc, bool BuildAndDiagnose,
                        QualType &CaptureType,
                        QualType &DeclRefType,
                        const unsigned *const FunctionScopeIndexToStopAt);

/// Try to capture the given variable.
bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
                        TryCaptureKind Kind = TryCapture_Implicit,
                        SourceLocation EllipsisLoc = SourceLocation());

/// Checks if the variable must be captured.
bool NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc);

/// Given a variable, determine the type that a reference to that
/// variable will have in the given scope.
QualType getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc);

/// Mark all of the declarations referenced within a particular AST node as
/// referenced. Used when template instantiation instantiates a non-dependent
/// type -- entities referenced by the type are now referenced.
void MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T);
void MarkDeclarationsReferencedInExpr(Expr *E,
                                      bool SkipLocalVariables = false);

/// Try to recover by turning the given expression into a
/// call.  Returns true if recovery was attempted or an error was
/// emitted; this may also leave the ExprResult invalid.
bool tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
                          bool ForceComplain = false,
                          bool (*IsPlausibleResult)(QualType) = nullptr);

/// Figure out if an expression could be turned into a call.
bool tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
                   UnresolvedSetImpl &NonTemplateOverloads);

/// Conditionally issue a diagnostic based on the current
/// evaluation context.
///
/// \param Statement If Statement is non-null, delay reporting the
/// diagnostic until the function body is parsed, and then do a basic
/// reachability analysis to determine if the statement is reachable.
/// If it is unreachable, the diagnostic will not be emitted.
bool DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
                         const PartialDiagnostic &PD);
/// Similar, but diagnostic is only produced if all the specified statements
/// are reachable.
bool DiagRuntimeBehavior(SourceLocation Loc, ArrayRef<const Stmt*> Stmts,
                         const PartialDiagnostic &PD);

// Primary Expressions.
SourceRange getExprRange(Expr *E) const;

ExprResult ActOnIdExpression(
    Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
    UnqualifiedId &Id, bool HasTrailingLParen, bool IsAddressOfOperand,
    CorrectionCandidateCallback *CCC = nullptr,
    bool IsInlineAsmIdentifier = false, Token *KeywordReplacement = nullptr);

void DecomposeUnqualifiedId(const UnqualifiedId &Id,
                            TemplateArgumentListInfo &Buffer,
                            DeclarationNameInfo &NameInfo,
                            const TemplateArgumentListInfo *&TemplateArgs);

bool
DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
                    CorrectionCandidateCallback &CCC,
                    TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
                    ArrayRef<Expr *> Args = None, TypoExpr **Out = nullptr);

ExprResult LookupInObjCMethod(LookupResult &LookUp, Scope *S,
                              IdentifierInfo *II,
                              bool AllowBuiltinCreation=false);

ExprResult ActOnDependentIdExpression(const CXXScopeSpec &SS,
                                      SourceLocation TemplateKWLoc,
                                      const DeclarationNameInfo &NameInfo,
                                      bool isAddressOfOperand,
                              const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildDeclRefExpr(ValueDecl *D, QualType Ty,
                            ExprValueKind VK,
                            SourceLocation Loc,
                            const CXXScopeSpec *SS = nullptr);
ExprResult
BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
                 const DeclarationNameInfo &NameInfo,
                 const CXXScopeSpec *SS = nullptr,
                 NamedDecl *FoundD = nullptr,
                 const TemplateArgumentListInfo *TemplateArgs = nullptr);
ExprResult
BuildAnonymousStructUnionMemberReference(
    const CXXScopeSpec &SS,
    SourceLocation nameLoc,
    IndirectFieldDecl *indirectField,
    DeclAccessPair FoundDecl = DeclAccessPair::make(nullptr, AS_none),
    Expr *baseObjectExpr = nullptr,
    SourceLocation opLoc = SourceLocation());

ExprResult BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
                                           SourceLocation TemplateKWLoc,
                                           LookupResult &R,
                              const TemplateArgumentListInfo *TemplateArgs,
                                           const Scope *S);
ExprResult BuildImplicitMemberExpr(const CXXScopeSpec &SS,
                                   SourceLocation TemplateKWLoc,
                                   LookupResult &R,
                              const TemplateArgumentListInfo *TemplateArgs,
                                   bool IsDefiniteInstance,
                                   const Scope *S);
bool UseArgumentDependentLookup(const CXXScopeSpec &SS,
                                const LookupResult &R,
                                bool HasTrailingLParen);

ExprResult
BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
                                  const DeclarationNameInfo &NameInfo,
                                  bool IsAddressOfOperand, const Scope *S,
                                  TypeSourceInfo **RecoveryTSI = nullptr);

ExprResult BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
                                     SourceLocation TemplateKWLoc,
                              const DeclarationNameInfo &NameInfo,
                              const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS,
                                    LookupResult &R,
                                    bool NeedsADL,
                                    bool AcceptInvalidDecl = false);
ExprResult BuildDeclarationNameExpr(
    const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D,
    NamedDecl *FoundD = nullptr,
    const TemplateArgumentListInfo *TemplateArgs = nullptr,
    bool AcceptInvalidDecl = false);

ExprResult BuildLiteralOperatorCall(LookupResult &R,
                    DeclarationNameInfo &SuffixInfo,
                    ArrayRef<Expr *> Args,
                    SourceLocation LitEndLoc,
                    TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr);

ExprResult BuildPredefinedExpr(SourceLocation Loc,
                               PredefinedExpr::IdentKind IK);
ExprResult ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind);
ExprResult ActOnIntegerConstant(SourceLocation Loc, uint64_t Val);

bool CheckLoopHintExpr(Expr *E, SourceLocation Loc);

ExprResult ActOnNumericConstant(const Token &Tok, Scope *UDLScope = nullptr);
ExprResult ActOnCharacterConstant(const Token &Tok,
                                  Scope *UDLScope = nullptr);
ExprResult ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E);
ExprResult ActOnParenListExpr(SourceLocation L,
                              SourceLocation R,
                              MultiExprArg Val);

/// ActOnStringLiteral - The specified tokens were lexed as pasted string
/// fragments (e.g. "foo" "bar" L"baz").
ExprResult ActOnStringLiteral(ArrayRef<Token> StringToks,
                              Scope *UDLScope = nullptr);

ExprResult ActOnGenericSelectionExpr(SourceLocation KeyLoc,
                                     SourceLocation DefaultLoc,
                                     SourceLocation RParenLoc,
                                     Expr *ControllingExpr,
                                     ArrayRef<ParsedType> ArgTypes,
                                     ArrayRef<Expr *> ArgExprs);
ExprResult CreateGenericSelectionExpr(SourceLocation KeyLoc,
                                      SourceLocation DefaultLoc,
                                      SourceLocation RParenLoc,
                                      Expr *ControllingExpr,
                                      ArrayRef<TypeSourceInfo *> Types,
                                      ArrayRef<Expr *> Exprs);

// Binary/Unary Operators.  'Tok' is the token for the operator.
ExprResult CreateBuiltinUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc,
                                Expr *InputExpr);
ExprResult BuildUnaryOp(Scope *S, SourceLocation OpLoc,
                        UnaryOperatorKind Opc, Expr *Input);
ExprResult ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
                        tok::TokenKind Op, Expr *Input);

bool isQualifiedMemberAccess(Expr *E);
QualType CheckAddressOfOperand(ExprResult &Operand, SourceLocation OpLoc);

ExprResult CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
                                          SourceLocation OpLoc,
                                          UnaryExprOrTypeTrait ExprKind,
                                          SourceRange R);
ExprResult CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
                                          UnaryExprOrTypeTrait ExprKind);
ExprResult
  ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
                                UnaryExprOrTypeTrait ExprKind,
                                bool IsType, void *TyOrEx,
                                SourceRange ArgRange);

ExprResult CheckPlaceholderExpr(Expr *E);
bool CheckVecStepExpr(Expr *E);

bool CheckUnaryExprOrTypeTraitOperand(Expr *E, UnaryExprOrTypeTrait ExprKind);
bool CheckUnaryExprOrTypeTraitOperand(QualType ExprType, SourceLocation OpLoc,
                                      SourceRange ExprRange,
                                      UnaryExprOrTypeTrait ExprKind);
ExprResult ActOnSizeofParameterPackExpr(Scope *S,
                                        SourceLocation OpLoc,
                                        IdentifierInfo &Name,
                                        SourceLocation NameLoc,
                                        SourceLocation RParenLoc);
ExprResult ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
                               tok::TokenKind Kind, Expr *Input);

ExprResult ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
                                   Expr *Idx, SourceLocation RLoc);
ExprResult CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
                                           Expr *Idx, SourceLocation RLoc);
ExprResult ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc,
                                    Expr *LowerBound, SourceLocation ColonLoc,
                                    Expr *Length, SourceLocation RBLoc);

// This struct is for use by ActOnMemberAccess to allow
// BuildMemberReferenceExpr to be able to reinvoke ActOnMemberAccess after
// changing the access operator from a '.' to a '->' (to see if that is the
// change needed to fix an error about an unknown member, e.g. when the class
// defines a custom operator->).
struct ActOnMemberAccessExtraArgs {
  Scope *S;
  UnqualifiedId &Id;
  Decl *ObjCImpDecl;
};

ExprResult BuildMemberReferenceExpr(
    Expr *Base, QualType BaseType, SourceLocation OpLoc, bool IsArrow,
    CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
    NamedDecl *FirstQualifierInScope, const DeclarationNameInfo &NameInfo,
    const TemplateArgumentListInfo *TemplateArgs,
    const Scope *S,
    ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);

ExprResult
BuildMemberReferenceExpr(Expr *Base, QualType BaseType, SourceLocation OpLoc,
                         bool IsArrow, const CXXScopeSpec &SS,
                         SourceLocation TemplateKWLoc,
                         NamedDecl *FirstQualifierInScope, LookupResult &R,
                         const TemplateArgumentListInfo *TemplateArgs,
                         const Scope *S,
                         bool SuppressQualifierCheck = false,
                         ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);

ExprResult BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow,
                                   SourceLocation OpLoc,
                                   const CXXScopeSpec &SS, FieldDecl *Field,
                                   DeclAccessPair FoundDecl,
                                   const DeclarationNameInfo &MemberNameInfo);

ExprResult PerformMemberExprBaseConversion(Expr *Base, bool IsArrow);

bool CheckQualifiedMemberReference(Expr *BaseExpr, QualType BaseType,
                                   const CXXScopeSpec &SS,
                                   const LookupResult &R);

ExprResult ActOnDependentMemberExpr(Expr *Base, QualType BaseType,
                                    bool IsArrow, SourceLocation OpLoc,
                                    const CXXScopeSpec &SS,
                                    SourceLocation TemplateKWLoc,
                                    NamedDecl *FirstQualifierInScope,
                             const DeclarationNameInfo &NameInfo,
                             const TemplateArgumentListInfo *TemplateArgs);

ExprResult ActOnMemberAccessExpr(Scope *S, Expr *Base,
                                 SourceLocation OpLoc,
                                 tok::TokenKind OpKind,
                                 CXXScopeSpec &SS,
                                 SourceLocation TemplateKWLoc,
                                 UnqualifiedId &Member,
                                 Decl *ObjCImpDecl);

void ActOnDefaultCtorInitializers(Decl *CDtorDecl);
bool ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
                             FunctionDecl *FDecl,
                             const FunctionProtoType *Proto,
                             ArrayRef<Expr *> Args,
                             SourceLocation RParenLoc,
                             bool ExecConfig = false);
void CheckStaticArrayArgument(SourceLocation CallLoc,
                              ParmVarDecl *Param,
                              const Expr *ArgExpr);

/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
/// This provides the location of the left/right parens and a list of comma
/// locations.
ExprResult ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
                         MultiExprArg ArgExprs, SourceLocation RParenLoc,
                         Expr *ExecConfig = nullptr);
ExprResult BuildCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
                         MultiExprArg ArgExprs, SourceLocation RParenLoc,
                         Expr *ExecConfig = nullptr,
                         bool IsExecConfig = false);
ExprResult
BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl, SourceLocation LParenLoc,
                      ArrayRef<Expr *> Arg, SourceLocation RParenLoc,
                      Expr *Config = nullptr, bool IsExecConfig = false,
                      ADLCallKind UsesADL = ADLCallKind::NotADL);

ExprResult ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
                                   MultiExprArg ExecConfig,
                                   SourceLocation GGGLoc);

ExprResult ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
                         Declarator &D, ParsedType &Ty,
                         SourceLocation RParenLoc, Expr *CastExpr);
ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc,
                               TypeSourceInfo *Ty,
                               SourceLocation RParenLoc,
                               Expr *Op);
CastKind PrepareScalarCast(ExprResult &src, QualType destType);

/// Build an altivec or OpenCL literal.
ExprResult BuildVectorLiteral(SourceLocation LParenLoc,
                              SourceLocation RParenLoc, Expr *E,
                              TypeSourceInfo *TInfo);

ExprResult MaybeConvertParenListExprToParenExpr(Scope *S, Expr *ME);

ExprResult ActOnCompoundLiteral(SourceLocation LParenLoc,
                                ParsedType Ty,
                                SourceLocation RParenLoc,
                                Expr *InitExpr);

ExprResult BuildCompoundLiteralExpr(SourceLocation LParenLoc,
                                    TypeSourceInfo *TInfo,
                                    SourceLocation RParenLoc,
                                    Expr *LiteralExpr);

ExprResult ActOnInitList(SourceLocation LBraceLoc,
                         MultiExprArg InitArgList,
                         SourceLocation RBraceLoc);

ExprResult ActOnDesignatedInitializer(Designation &Desig,
                                      SourceLocation Loc,
                                      bool GNUSyntax,
                                      ExprResult Init);

4552private:
static BinaryOperatorKind ConvertTokenKindToBinaryOpcode(tok::TokenKind Kind);

4555public:
ExprResult ActOnBinOp(Scope *S, SourceLocation TokLoc,
                      tok::TokenKind Kind, Expr *LHSExpr, Expr *RHSExpr);
ExprResult BuildBinOp(Scope *S, SourceLocation OpLoc,
                      BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr);
ExprResult CreateBuiltinBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc,
                              Expr *LHSExpr, Expr *RHSExpr);

void DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc);

/// ActOnConditionalOp - Parse a ?: operation.  Note that 'LHS' may be null
/// in the case of a the GNU conditional expr extension.
ExprResult ActOnConditionalOp(SourceLocation QuestionLoc,
                              SourceLocation ColonLoc,
                              Expr *CondExpr, Expr *LHSExpr, Expr *RHSExpr);

/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
ExprResult ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
                          LabelDecl *TheDecl);

void ActOnStartStmtExpr();
ExprResult ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
                         SourceLocation RPLoc); // "({..})"
// Handle the final expression in a statement expression.
ExprResult ActOnStmtExprResult(ExprResult E);
void ActOnStmtExprError();

// __builtin_offsetof(type, identifier(.identifier|[expr])*)
struct OffsetOfComponent {
  SourceLocation LocStart, LocEnd;
  bool isBrackets;  // true if [expr], false if .ident
  union {
    IdentifierInfo *IdentInfo;
    Expr *E;
  } U;
};

/// __builtin_offsetof(type, a.b[123][456].c)
ExprResult BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
                                TypeSourceInfo *TInfo,
                                ArrayRef<OffsetOfComponent> Components,
                                SourceLocation RParenLoc);
ExprResult ActOnBuiltinOffsetOf(Scope *S,
                                SourceLocation BuiltinLoc,
                                SourceLocation TypeLoc,
                                ParsedType ParsedArgTy,
                                ArrayRef<OffsetOfComponent> Components,
                                SourceLocation RParenLoc);

// __builtin_choose_expr(constExpr, expr1, expr2)
ExprResult ActOnChooseExpr(SourceLocation BuiltinLoc,
                           Expr *CondExpr, Expr *LHSExpr,
                           Expr *RHSExpr, SourceLocation RPLoc);

// __builtin_va_arg(expr, type)
ExprResult ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
                      SourceLocation RPLoc);
ExprResult BuildVAArgExpr(SourceLocation BuiltinLoc, Expr *E,
                          TypeSourceInfo *TInfo, SourceLocation RPLoc);

// __null
ExprResult ActOnGNUNullExpr(SourceLocation TokenLoc);

bool CheckCaseExpression(Expr *E);

/// Describes the result of an "if-exists" condition check.
enum IfExistsResult {
  /// The symbol exists.
  IER_Exists,

  /// The symbol does not exist.
  IER_DoesNotExist,

  /// The name is a dependent name, so the results will differ
  /// from one instantiation to the next.
  IER_Dependent,

  /// An error occurred.
  IER_Error
};

IfExistsResult
CheckMicrosoftIfExistsSymbol(Scope *S, CXXScopeSpec &SS,
                             const DeclarationNameInfo &TargetNameInfo);

IfExistsResult
CheckMicrosoftIfExistsSymbol(Scope *S, SourceLocation KeywordLoc,
                             bool IsIfExists, CXXScopeSpec &SS,
                             UnqualifiedId &Name);

StmtResult BuildMSDependentExistsStmt(SourceLocation KeywordLoc,
                                      bool IsIfExists,
                                      NestedNameSpecifierLoc QualifierLoc,
                                      DeclarationNameInfo NameInfo,
                                      Stmt *Nested);
StmtResult ActOnMSDependentExistsStmt(SourceLocation KeywordLoc,
                                      bool IsIfExists,
                                      CXXScopeSpec &SS, UnqualifiedId &Name,
                                      Stmt *Nested);

//===------------------------- "Block" Extension ------------------------===//

/// ActOnBlockStart - This callback is invoked when a block literal is
/// started.
void ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope);

/// ActOnBlockArguments - This callback allows processing of block arguments.
/// If there are no arguments, this is still invoked.
void ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
                         Scope *CurScope);

/// ActOnBlockError - If there is an error parsing a block, this callback
/// is invoked to pop the information about the block from the action impl.
void ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope);

/// ActOnBlockStmtExpr - This is called when the body of a block statement
/// literal was successfully completed.  ^(int x){...}
ExprResult ActOnBlockStmtExpr(SourceLocation CaretLoc, Stmt *Body,
                              Scope *CurScope);

//===---------------------------- Clang Extensions ----------------------===//

/// __builtin_convertvector(...)
ExprResult ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy,
                                  SourceLocation BuiltinLoc,
                                  SourceLocation RParenLoc);

//===---------------------------- OpenCL Features -----------------------===//

/// __builtin_astype(...)
ExprResult ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
                           SourceLocation BuiltinLoc,
                           SourceLocation RParenLoc);

//===---------------------------- C++ Features --------------------------===//

// Act on C++ namespaces
Decl *ActOnStartNamespaceDef(Scope *S, SourceLocation InlineLoc,
                             SourceLocation NamespaceLoc,
                             SourceLocation IdentLoc, IdentifierInfo *Ident,
                             SourceLocation LBrace,
                             const ParsedAttributesView &AttrList,
                             UsingDirectiveDecl *&UsingDecl);
void ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace);

NamespaceDecl *getStdNamespace() const;
NamespaceDecl *getOrCreateStdNamespace();

NamespaceDecl *lookupStdExperimentalNamespace();

CXXRecordDecl *getStdBadAlloc() const;
EnumDecl *getStdAlignValT() const;

4708private:
// A cache representing if we've fully checked the various comparison category
// types stored in ASTContext. The bit-index corresponds to the integer value
// of a ComparisonCategoryType enumerator.
llvm::SmallBitVector FullyCheckedComparisonCategories;

ValueDecl *tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl,
                                       CXXScopeSpec &SS,
                                       ParsedType TemplateTypeTy,
                                       IdentifierInfo *MemberOrBase);

4719public:
/// Lookup the specified comparison category types in the standard
///   library, an check the VarDecls possibly returned by the operator<=>
///   builtins for that type.
///
/// \return The type of the comparison category type corresponding to the
///   specified Kind, or a null type if an error occurs
QualType CheckComparisonCategoryType(ComparisonCategoryType Kind,
                                     SourceLocation Loc);

/// Tests whether Ty is an instance of std::initializer_list and, if
/// it is and Element is not NULL, assigns the element type to Element.
bool isStdInitializerList(QualType Ty, QualType *Element);

/// Looks for the std::initializer_list template and instantiates it
/// with Element, or emits an error if it's not found.
///
/// \returns The instantiated template, or null on error.
QualType BuildStdInitializerList(QualType Element, SourceLocation Loc);

/// Determine whether Ctor is an initializer-list constructor, as
/// defined in [dcl.init.list]p2.
bool isInitListConstructor(const FunctionDecl *Ctor);

Decl *ActOnUsingDirective(Scope *CurScope, SourceLocation UsingLoc,
                          SourceLocation NamespcLoc, CXXScopeSpec &SS,
                          SourceLocation IdentLoc,
                          IdentifierInfo *NamespcName,
                          const ParsedAttributesView &AttrList);

void PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir);

Decl *ActOnNamespaceAliasDef(Scope *CurScope,
                             SourceLocation NamespaceLoc,
                             SourceLocation AliasLoc,
                             IdentifierInfo *Alias,
                             CXXScopeSpec &SS,
                             SourceLocation IdentLoc,
                             IdentifierInfo *Ident);

void HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow);
bool CheckUsingShadowDecl(UsingDecl *UD, NamedDecl *Target,
                          const LookupResult &PreviousDecls,
                          UsingShadowDecl *&PrevShadow);
UsingShadowDecl *BuildUsingShadowDecl(Scope *S, UsingDecl *UD,
                                      NamedDecl *Target,
                                      UsingShadowDecl *PrevDecl);

bool CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
                                 bool HasTypenameKeyword,
                                 const CXXScopeSpec &SS,
                                 SourceLocation NameLoc,
                                 const LookupResult &Previous);
bool CheckUsingDeclQualifier(SourceLocation UsingLoc,
                             bool HasTypename,
                             const CXXScopeSpec &SS,
                             const DeclarationNameInfo &NameInfo,
                             SourceLocation NameLoc);

NamedDecl *BuildUsingDeclaration(
    Scope *S, AccessSpecifier AS, SourceLocation UsingLoc,
    bool HasTypenameKeyword, SourceLocation TypenameLoc, CXXScopeSpec &SS,
    DeclarationNameInfo NameInfo, SourceLocation EllipsisLoc,
    const ParsedAttributesView &AttrList, bool IsInstantiation);
NamedDecl *BuildUsingPackDecl(NamedDecl *InstantiatedFrom,
                              ArrayRef<NamedDecl *> Expansions);

bool CheckInheritingConstructorUsingDecl(UsingDecl *UD);

/// Given a derived-class using shadow declaration for a constructor and the
/// correspnding base class constructor, find or create the implicit
/// synthesized derived class constructor to use for this initialization.
CXXConstructorDecl *
findInheritingConstructor(SourceLocation Loc, CXXConstructorDecl *BaseCtor,
                          ConstructorUsingShadowDecl *DerivedShadow);

Decl *ActOnUsingDeclaration(Scope *CurScope, AccessSpecifier AS,
                            SourceLocation UsingLoc,
                            SourceLocation TypenameLoc, CXXScopeSpec &SS,
                            UnqualifiedId &Name, SourceLocation EllipsisLoc,
                            const ParsedAttributesView &AttrList);
Decl *ActOnAliasDeclaration(Scope *CurScope, AccessSpecifier AS,
                            MultiTemplateParamsArg TemplateParams,
                            SourceLocation UsingLoc, UnqualifiedId &Name,
                            const ParsedAttributesView &AttrList,
                            TypeResult Type, Decl *DeclFromDeclSpec);

/// BuildCXXConstructExpr - Creates a complete call to a constructor,
/// including handling of its default argument expressions.
///
/// \param ConstructKind - a CXXConstructExpr::ConstructionKind
ExprResult
BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                      NamedDecl *FoundDecl,
                      CXXConstructorDecl *Constructor, MultiExprArg Exprs,
                      bool HadMultipleCandidates, bool IsListInitialization,
                      bool IsStdInitListInitialization,
                      bool RequiresZeroInit, unsigned ConstructKind,
                      SourceRange ParenRange);

/// Build a CXXConstructExpr whose constructor has already been resolved if
/// it denotes an inherited constructor.
ExprResult
BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                      CXXConstructorDecl *Constructor, bool Elidable,
                      MultiExprArg Exprs,
                      bool HadMultipleCandidates, bool IsListInitialization,
                      bool IsStdInitListInitialization,
                      bool RequiresZeroInit, unsigned ConstructKind,
                      SourceRange ParenRange);

// FIXME: Can we remove this and have the above BuildCXXConstructExpr check if
// the constructor can be elidable?
ExprResult
BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                      NamedDecl *FoundDecl,
                      CXXConstructorDecl *Constructor, bool Elidable,
                      MultiExprArg Exprs, bool HadMultipleCandidates,
                      bool IsListInitialization,
                      bool IsStdInitListInitialization, bool RequiresZeroInit,
                      unsigned ConstructKind, SourceRange ParenRange);

ExprResult BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field);


/// Instantiate or parse a C++ default argument expression as necessary.
/// Return true on error.
bool CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD,
                            ParmVarDecl *Param);

/// BuildCXXDefaultArgExpr - Creates a CXXDefaultArgExpr, instantiating
/// the default expr if needed.
ExprResult BuildCXXDefaultArgExpr(SourceLocation CallLoc,
                                  FunctionDecl *FD,
                                  ParmVarDecl *Param);

/// FinalizeVarWithDestructor - Prepare for calling destructor on the
/// constructed variable.
void FinalizeVarWithDestructor(VarDecl *VD, const RecordType *DeclInitType);

/// Helper class that collects exception specifications for
/// implicitly-declared special member functions.
class ImplicitExceptionSpecification {
  // Pointer to allow copying
  Sema *Self;
  // We order exception specifications thus:
  // noexcept is the most restrictive, but is only used in C++11.
  // throw() comes next.
  // Then a throw(collected exceptions)
  // Finally no specification, which is expressed as noexcept(false).
  // throw(...) is used instead if any called function uses it.
  ExceptionSpecificationType ComputedEST;
  llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen;
  SmallVector<QualType, 4> Exceptions;

  void ClearExceptions() {
    ExceptionsSeen.clear();
    Exceptions.clear();
  }

public:
  explicit ImplicitExceptionSpecification(Sema &Self)
    : Self(&Self), ComputedEST(EST_BasicNoexcept) {
    if (!Self.getLangOpts().CPlusPlus11)
      ComputedEST = EST_DynamicNone;
  }

  /// Get the computed exception specification type.
  ExceptionSpecificationType getExceptionSpecType() const {
    assert(!isComputedNoexcept(ComputedEST) &&((!isComputedNoexcept(ComputedEST) && "noexcept(expr) should not be a possible result"
) ? static_cast<void> (0) : __assert_fail ("!isComputedNoexcept(ComputedEST) && \"noexcept(expr) should not be a possible result\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 4889, __PRETTY_FUNCTION__))
           "noexcept(expr) should not be a possible result")((!isComputedNoexcept(ComputedEST) && "noexcept(expr) should not be a possible result"
) ? static_cast<void> (0) : __assert_fail ("!isComputedNoexcept(ComputedEST) && \"noexcept(expr) should not be a possible result\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 4889, __PRETTY_FUNCTION__));
    return ComputedEST;
  }

  /// The number of exceptions in the exception specification.
  unsigned size() const { return Exceptions.size(); }

  /// The set of exceptions in the exception specification.
  const QualType *data() const { return Exceptions.data(); }

  /// Integrate another called method into the collected data.
  void CalledDecl(SourceLocation CallLoc, const CXXMethodDecl *Method);

  /// Integrate an invoked expression into the collected data.
  void CalledExpr(Expr *E);

  /// Overwrite an EPI's exception specification with this
  /// computed exception specification.
  FunctionProtoType::ExceptionSpecInfo getExceptionSpec() const {
    FunctionProtoType::ExceptionSpecInfo ESI;
    ESI.Type = getExceptionSpecType();
    if (ESI.Type == EST_Dynamic) {
      ESI.Exceptions = Exceptions;
    } else if (ESI.Type == EST_None) {
      /// C++11 [except.spec]p14:
      ///   The exception-specification is noexcept(false) if the set of
      ///   potential exceptions of the special member function contains "any"
      ESI.Type = EST_NoexceptFalse;
      ESI.NoexceptExpr = Self->ActOnCXXBoolLiteral(SourceLocation(),
                                                   tok::kw_false).get();
    }
    return ESI;
  }
};

/// Determine what sort of exception specification a defaulted
/// copy constructor of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc,
                                         CXXMethodDecl *MD);

/// Determine what sort of exception specification a defaulted
/// default constructor of a class will have, and whether the parameter
/// will be const.
ImplicitExceptionSpecification
ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD);

/// Determine what sort of exception specification a defaulted
/// copy assignment operator of a class will have, and whether the
/// parameter will be const.
ImplicitExceptionSpecification
ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD);

/// Determine what sort of exception specification a defaulted move
/// constructor of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD);

/// Determine what sort of exception specification a defaulted move
/// assignment operator of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD);

/// Determine what sort of exception specification a defaulted
/// destructor of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD);

/// Determine what sort of exception specification an inheriting
/// constructor of a class will have.
ImplicitExceptionSpecification
ComputeInheritingCtorExceptionSpec(SourceLocation Loc,
                                   CXXConstructorDecl *CD);

/// Evaluate the implicit exception specification for a defaulted
/// special member function.
void EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD);

/// Check the given noexcept-specifier, convert its expression, and compute
/// the appropriate ExceptionSpecificationType.
ExprResult ActOnNoexceptSpec(SourceLocation NoexceptLoc, Expr *NoexceptExpr,
                             ExceptionSpecificationType &EST);

/// Check the given exception-specification and update the
/// exception specification information with the results.
void checkExceptionSpecification(bool IsTopLevel,
                                 ExceptionSpecificationType EST,
                                 ArrayRef<ParsedType> DynamicExceptions,
                                 ArrayRef<SourceRange> DynamicExceptionRanges,
                                 Expr *NoexceptExpr,
                                 SmallVectorImpl<QualType> &Exceptions,
                                 FunctionProtoType::ExceptionSpecInfo &ESI);

/// Determine if we're in a case where we need to (incorrectly) eagerly
/// parse an exception specification to work around a libstdc++ bug.
bool isLibstdcxxEagerExceptionSpecHack(const Declarator &D);

/// Add an exception-specification to the given member function
/// (or member function template). The exception-specification was parsed
/// after the method itself was declared.
void actOnDelayedExceptionSpecification(Decl *Method,
       ExceptionSpecificationType EST,
       SourceRange SpecificationRange,
       ArrayRef<ParsedType> DynamicExceptions,
       ArrayRef<SourceRange> DynamicExceptionRanges,
       Expr *NoexceptExpr);

class InheritedConstructorInfo;

/// Determine if a special member function should have a deleted
/// definition when it is defaulted.
bool ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
                               InheritedConstructorInfo *ICI = nullptr,
                               bool Diagnose = false);

/// Declare the implicit default constructor for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// default constructor will be added.
///
/// \returns The implicitly-declared default constructor.
CXXConstructorDecl *DeclareImplicitDefaultConstructor(
                                                   CXXRecordDecl *ClassDecl);

/// DefineImplicitDefaultConstructor - Checks for feasibility of
/// defining this constructor as the default constructor.
void DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
                                      CXXConstructorDecl *Constructor);

/// Declare the implicit destructor for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// destructor will be added.
///
/// \returns The implicitly-declared destructor.
CXXDestructorDecl *DeclareImplicitDestructor(CXXRecordDecl *ClassDecl);

/// DefineImplicitDestructor - Checks for feasibility of
/// defining this destructor as the default destructor.
void DefineImplicitDestructor(SourceLocation CurrentLocation,
                              CXXDestructorDecl *Destructor);

/// Build an exception spec for destructors that don't have one.
///
/// C++11 says that user-defined destructors with no exception spec get one
/// that looks as if the destructor was implicitly declared.
void AdjustDestructorExceptionSpec(CXXDestructorDecl *Destructor);

/// Define the specified inheriting constructor.
void DefineInheritingConstructor(SourceLocation UseLoc,
                                 CXXConstructorDecl *Constructor);

/// Declare the implicit copy constructor for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// copy constructor will be added.
///
/// \returns The implicitly-declared copy constructor.
CXXConstructorDecl *DeclareImplicitCopyConstructor(CXXRecordDecl *ClassDecl);

/// DefineImplicitCopyConstructor - Checks for feasibility of
/// defining this constructor as the copy constructor.
void DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
                                   CXXConstructorDecl *Constructor);

/// Declare the implicit move constructor for the given class.
///
/// \param ClassDecl The Class declaration into which the implicit
/// move constructor will be added.
///
/// \returns The implicitly-declared move constructor, or NULL if it wasn't
/// declared.
CXXConstructorDecl *DeclareImplicitMoveConstructor(CXXRecordDecl *ClassDecl);

/// DefineImplicitMoveConstructor - Checks for feasibility of
/// defining this constructor as the move constructor.
void DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
                                   CXXConstructorDecl *Constructor);

/// Declare the implicit copy assignment operator for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// copy assignment operator will be added.
///
/// \returns The implicitly-declared copy assignment operator.
CXXMethodDecl *DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl);

/// Defines an implicitly-declared copy assignment operator.
void DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
                                  CXXMethodDecl *MethodDecl);

/// Declare the implicit move assignment operator for the given class.
///
/// \param ClassDecl The Class declaration into which the implicit
/// move assignment operator will be added.
///
/// \returns The implicitly-declared move assignment operator, or NULL if it
/// wasn't declared.
CXXMethodDecl *DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl);

/// Defines an implicitly-declared move assignment operator.
void DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
                                  CXXMethodDecl *MethodDecl);

/// Force the declaration of any implicitly-declared members of this
/// class.
void ForceDeclarationOfImplicitMembers(CXXRecordDecl *Class);

/// Check a completed declaration of an implicit special member.
void CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD);

/// Determine whether the given function is an implicitly-deleted
/// special member function.
bool isImplicitlyDeleted(FunctionDecl *FD);

/// Check whether 'this' shows up in the type of a static member
/// function after the (naturally empty) cv-qualifier-seq would be.
///
/// \returns true if an error occurred.
bool checkThisInStaticMemberFunctionType(CXXMethodDecl *Method);

/// Whether this' shows up in the exception specification of a static
/// member function.
bool checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method);

/// Check whether 'this' shows up in the attributes of the given
/// static member function.
///
/// \returns true if an error occurred.
bool checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method);

/// MaybeBindToTemporary - If the passed in expression has a record type with
/// a non-trivial destructor, this will return CXXBindTemporaryExpr. Otherwise
/// it simply returns the passed in expression.
ExprResult MaybeBindToTemporary(Expr *E);

bool CompleteConstructorCall(CXXConstructorDecl *Constructor,
                             MultiExprArg ArgsPtr,
                             SourceLocation Loc,
                             SmallVectorImpl<Expr*> &ConvertedArgs,
                             bool AllowExplicit = false,
                             bool IsListInitialization = false);

ParsedType getInheritingConstructorName(CXXScopeSpec &SS,
                                        SourceLocation NameLoc,
                                        IdentifierInfo &Name);

ParsedType getConstructorName(IdentifierInfo &II, SourceLocation NameLoc,
                              Scope *S, CXXScopeSpec &SS,
                              bool EnteringContext);
ParsedType getDestructorName(SourceLocation TildeLoc,
                             IdentifierInfo &II, SourceLocation NameLoc,
                             Scope *S, CXXScopeSpec &SS,
                             ParsedType ObjectType,
                             bool EnteringContext);

ParsedType getDestructorTypeForDecltype(const DeclSpec &DS,
                                        ParsedType ObjectType);

// Checks that reinterpret casts don't have undefined behavior.
void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType,
                                    bool IsDereference, SourceRange Range);

/// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
ExprResult ActOnCXXNamedCast(SourceLocation OpLoc,
                             tok::TokenKind Kind,
                             SourceLocation LAngleBracketLoc,
                             Declarator &D,
                             SourceLocation RAngleBracketLoc,
                             SourceLocation LParenLoc,
                             Expr *E,
                             SourceLocation RParenLoc);

ExprResult BuildCXXNamedCast(SourceLocation OpLoc,
                             tok::TokenKind Kind,
                             TypeSourceInfo *Ty,
                             Expr *E,
                             SourceRange AngleBrackets,
                             SourceRange Parens);

ExprResult BuildCXXTypeId(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          TypeSourceInfo *Operand,
                          SourceLocation RParenLoc);
ExprResult BuildCXXTypeId(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          Expr *Operand,
                          SourceLocation RParenLoc);

/// ActOnCXXTypeid - Parse typeid( something ).
ExprResult ActOnCXXTypeid(SourceLocation OpLoc,
                          SourceLocation LParenLoc, bool isType,
                          void *TyOrExpr,
                          SourceLocation RParenLoc);

ExprResult BuildCXXUuidof(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          TypeSourceInfo *Operand,
                          SourceLocation RParenLoc);
ExprResult BuildCXXUuidof(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          Expr *Operand,
                          SourceLocation RParenLoc);

/// ActOnCXXUuidof - Parse __uuidof( something ).
ExprResult ActOnCXXUuidof(SourceLocation OpLoc,
                          SourceLocation LParenLoc, bool isType,
                          void *TyOrExpr,
                          SourceLocation RParenLoc);

/// Handle a C++1z fold-expression: ( expr op ... op expr ).
ExprResult ActOnCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
                            tok::TokenKind Operator,
                            SourceLocation EllipsisLoc, Expr *RHS,
                            SourceLocation RParenLoc);
ExprResult BuildCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
                            BinaryOperatorKind Operator,
                            SourceLocation EllipsisLoc, Expr *RHS,
                            SourceLocation RParenLoc);
ExprResult BuildEmptyCXXFoldExpr(SourceLocation EllipsisLoc,
                                 BinaryOperatorKind Operator);

//// ActOnCXXThis -  Parse 'this' pointer.
ExprResult ActOnCXXThis(SourceLocation loc);

/// Try to retrieve the type of the 'this' pointer.
///
/// \returns The type of 'this', if possible. Otherwise, returns a NULL type.
QualType getCurrentThisType();

/// When non-NULL, the C++ 'this' expression is allowed despite the
/// current context not being a non-static member function. In such cases,
/// this provides the type used for 'this'.
QualType CXXThisTypeOverride;

/// RAII object used to temporarily allow the C++ 'this' expression
/// to be used, with the given qualifiers on the current class type.
class CXXThisScopeRAII {
  Sema &S;
  QualType OldCXXThisTypeOverride;
  bool Enabled;

public:
  /// Introduce a new scope where 'this' may be allowed (when enabled),
  /// using the given declaration (which is either a class template or a
  /// class) along with the given qualifiers.
  /// along with the qualifiers placed on '*this'.
  CXXThisScopeRAII(Sema &S, Decl *ContextDecl, Qualifiers CXXThisTypeQuals,
                   bool Enabled = true);

  ~CXXThisScopeRAII();
};

/// Make sure the value of 'this' is actually available in the current
/// context, if it is a potentially evaluated context.
///
/// \param Loc The location at which the capture of 'this' occurs.
///
/// \param Explicit Whether 'this' is explicitly captured in a lambda
/// capture list.
///
/// \param FunctionScopeIndexToStopAt If non-null, it points to the index
/// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
/// This is useful when enclosing lambdas must speculatively capture
/// 'this' that may or may not be used in certain specializations of
/// a nested generic lambda (depending on whether the name resolves to
/// a non-static member function or a static function).
/// \return returns 'true' if failed, 'false' if success.
bool CheckCXXThisCapture(SourceLocation Loc, bool Explicit = false,
    bool BuildAndDiagnose = true,
    const unsigned *const FunctionScopeIndexToStopAt = nullptr,
    bool ByCopy = false);

/// Determine whether the given type is the type of *this that is used
/// outside of the body of a member function for a type that is currently
/// being defined.
bool isThisOutsideMemberFunctionBody(QualType BaseType);

/// ActOnCXXBoolLiteral - Parse {true,false} literals.
ExprResult ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);


/// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
ExprResult ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);

ExprResult
ActOnObjCAvailabilityCheckExpr(llvm::ArrayRef<AvailabilitySpec> AvailSpecs,
                               SourceLocation AtLoc, SourceLocation RParen);

/// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
ExprResult ActOnCXXNullPtrLiteral(SourceLocation Loc);

//// ActOnCXXThrow -  Parse throw expressions.
ExprResult ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *expr);
ExprResult BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
                         bool IsThrownVarInScope);
bool CheckCXXThrowOperand(SourceLocation ThrowLoc, QualType ThrowTy, Expr *E);

/// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
/// Can be interpreted either as function-style casting ("int(x)")
/// or class type construction ("ClassType(x,y,z)")
/// or creation of a value-initialized type ("int()").
ExprResult ActOnCXXTypeConstructExpr(ParsedType TypeRep,
                                     SourceLocation LParenOrBraceLoc,
                                     MultiExprArg Exprs,
                                     SourceLocation RParenOrBraceLoc,
                                     bool ListInitialization);

ExprResult BuildCXXTypeConstructExpr(TypeSourceInfo *Type,
                                     SourceLocation LParenLoc,
                                     MultiExprArg Exprs,
                                     SourceLocation RParenLoc,
                                     bool ListInitialization);

/// ActOnCXXNew - Parsed a C++ 'new' expression.
ExprResult ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
                       SourceLocation PlacementLParen,
                       MultiExprArg PlacementArgs,
                       SourceLocation PlacementRParen,
                       SourceRange TypeIdParens, Declarator &D,
                       Expr *Initializer);
ExprResult BuildCXXNew(SourceRange Range, bool UseGlobal,
                       SourceLocation PlacementLParen,
                       MultiExprArg PlacementArgs,
                       SourceLocation PlacementRParen,
                       SourceRange TypeIdParens,
                       QualType AllocType,
                       TypeSourceInfo *AllocTypeInfo,
                       Optional<Expr *> ArraySize,
                       SourceRange DirectInitRange,
                       Expr *Initializer);

/// Determine whether \p FD is an aligned allocation or deallocation
/// function that is unavailable.
bool isUnavailableAlignedAllocationFunction(const FunctionDecl &FD) const;

/// Produce diagnostics if \p FD is an aligned allocation or deallocation
/// function that is unavailable.
void diagnoseUnavailableAlignedAllocation(const FunctionDecl &FD,
                                          SourceLocation Loc);

bool CheckAllocatedType(QualType AllocType, SourceLocation Loc,
                        SourceRange R);

/// The scope in which to find allocation functions.
enum AllocationFunctionScope {
  /// Only look for allocation functions in the global scope.
  AFS_Global,
  /// Only look for allocation functions in the scope of the
  /// allocated class.
  AFS_Class,
  /// Look for allocation functions in both the global scope
  /// and in the scope of the allocated class.
  AFS_Both
};

/// Finds the overloads of operator new and delete that are appropriate
/// for the allocation.
bool FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
                             AllocationFunctionScope NewScope,
                             AllocationFunctionScope DeleteScope,
                             QualType AllocType, bool IsArray,
                             bool &PassAlignment, MultiExprArg PlaceArgs,
                             FunctionDecl *&OperatorNew,
                             FunctionDecl *&OperatorDelete,
                             bool Diagnose = true);
void DeclareGlobalNewDelete();
void DeclareGlobalAllocationFunction(DeclarationName Name, QualType Return,
                                     ArrayRef<QualType> Params);

bool FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
                              DeclarationName Name, FunctionDecl* &Operator,
                              bool Diagnose = true);
FunctionDecl *FindUsualDeallocationFunction(SourceLocation StartLoc,
                                            bool CanProvideSize,
                                            bool Overaligned,
                                            DeclarationName Name);
FunctionDecl *FindDeallocationFunctionForDestructor(SourceLocation StartLoc,
                                                    CXXRecordDecl *RD);

/// ActOnCXXDelete - Parsed a C++ 'delete' expression
ExprResult ActOnCXXDelete(SourceLocation StartLoc,
                          bool UseGlobal, bool ArrayForm,
                          Expr *Operand);
void CheckVirtualDtorCall(CXXDestructorDecl *dtor, SourceLocation Loc,
                          bool IsDelete, bool CallCanBeVirtual,
                          bool WarnOnNonAbstractTypes,
                          SourceLocation DtorLoc);

ExprResult ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation LParen,
                             Expr *Operand, SourceLocation RParen);
ExprResult BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
                                SourceLocation RParen);

/// Parsed one of the type trait support pseudo-functions.
ExprResult ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
                          ArrayRef<ParsedType> Args,
                          SourceLocation RParenLoc);
ExprResult BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
                          ArrayRef<TypeSourceInfo *> Args,
                          SourceLocation RParenLoc);

/// ActOnArrayTypeTrait - Parsed one of the binary type trait support
/// pseudo-functions.
ExprResult ActOnArrayTypeTrait(ArrayTypeTrait ATT,
                               SourceLocation KWLoc,
                               ParsedType LhsTy,
                               Expr *DimExpr,
                               SourceLocation RParen);

ExprResult BuildArrayTypeTrait(ArrayTypeTrait ATT,
                               SourceLocation KWLoc,
                               TypeSourceInfo *TSInfo,
                               Expr *DimExpr,
                               SourceLocation RParen);

/// ActOnExpressionTrait - Parsed one of the unary type trait support
/// pseudo-functions.
ExprResult ActOnExpressionTrait(ExpressionTrait OET,
                                SourceLocation KWLoc,
                                Expr *Queried,
                                SourceLocation RParen);

ExprResult BuildExpressionTrait(ExpressionTrait OET,
                                SourceLocation KWLoc,
                                Expr *Queried,
                                SourceLocation RParen);

ExprResult ActOnStartCXXMemberReference(Scope *S,
                                        Expr *Base,
                                        SourceLocation OpLoc,
                                        tok::TokenKind OpKind,
                                        ParsedType &ObjectType,
                                        bool &MayBePseudoDestructor);

ExprResult BuildPseudoDestructorExpr(Expr *Base,
                                     SourceLocation OpLoc,
                                     tok::TokenKind OpKind,
                                     const CXXScopeSpec &SS,
                                     TypeSourceInfo *ScopeType,
                                     SourceLocation CCLoc,
                                     SourceLocation TildeLoc,
                                   PseudoDestructorTypeStorage DestroyedType);

ExprResult ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
                                     SourceLocation OpLoc,
                                     tok::TokenKind OpKind,
                                     CXXScopeSpec &SS,
                                     UnqualifiedId &FirstTypeName,
                                     SourceLocation CCLoc,
                                     SourceLocation TildeLoc,
                                     UnqualifiedId &SecondTypeName);

ExprResult ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
                                     SourceLocation OpLoc,
                                     tok::TokenKind OpKind,
                                     SourceLocation TildeLoc,
                                     const DeclSpec& DS);

/// MaybeCreateExprWithCleanups - If the current full-expression
/// requires any cleanups, surround it with a ExprWithCleanups node.
/// Otherwise, just returns the passed-in expression.
Expr *MaybeCreateExprWithCleanups(Expr *SubExpr);
Stmt *MaybeCreateStmtWithCleanups(Stmt *SubStmt);
ExprResult MaybeCreateExprWithCleanups(ExprResult SubExpr);

MaterializeTemporaryExpr *
CreateMaterializeTemporaryExpr(QualType T, Expr *Temporary,
                               bool BoundToLvalueReference);

ExprResult ActOnFinishFullExpr(Expr *Expr, bool DiscardedValue) {
  return ActOnFinishFullExpr(
      Expr, Expr ? Expr->getExprLoc() : SourceLocation(), DiscardedValue);
}
ExprResult ActOnFinishFullExpr(Expr *Expr, SourceLocation CC,
                               bool DiscardedValue, bool IsConstexpr = false);
StmtResult ActOnFinishFullStmt(Stmt *Stmt);

// Marks SS invalid if it represents an incomplete type.
bool RequireCompleteDeclContext(CXXScopeSpec &SS, DeclContext *DC);

DeclContext *computeDeclContext(QualType T);
DeclContext *computeDeclContext(const CXXScopeSpec &SS,
                                bool EnteringContext = false);
bool isDependentScopeSpecifier(const CXXScopeSpec &SS);
CXXRecordDecl *getCurrentInstantiationOf(NestedNameSpecifier *NNS);

/// The parser has parsed a global nested-name-specifier '::'.
///
/// \param CCLoc The location of the '::'.
///
/// \param SS The nested-name-specifier, which will be updated in-place
/// to reflect the parsed nested-name-specifier.
///
/// \returns true if an error occurred, false otherwise.
bool ActOnCXXGlobalScopeSpecifier(SourceLocation CCLoc, CXXScopeSpec &SS);

/// The parser has parsed a '__super' nested-name-specifier.
///
/// \param SuperLoc The location of the '__super' keyword.
///
/// \param ColonColonLoc The location of the '::'.
///
/// \param SS The nested-name-specifier, which will be updated in-place
/// to reflect the parsed nested-name-specifier.
///
/// \returns true if an error occurred, false otherwise.
bool ActOnSuperScopeSpecifier(SourceLocation SuperLoc,
                              SourceLocation ColonColonLoc, CXXScopeSpec &SS);

bool isAcceptableNestedNameSpecifier(const NamedDecl *SD,
                                     bool *CanCorrect = nullptr);
NamedDecl *FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS);

/// Keeps information about an identifier in a nested-name-spec.
///
struct NestedNameSpecInfo {
  /// The type of the object, if we're parsing nested-name-specifier in
  /// a member access expression.
  ParsedType ObjectType;

  /// The identifier preceding the '::'.
  IdentifierInfo *Identifier;

  /// The location of the identifier.
  SourceLocation IdentifierLoc;

  /// The location of the '::'.
  SourceLocation CCLoc;

  /// Creates info object for the most typical case.
  NestedNameSpecInfo(IdentifierInfo *II, SourceLocation IdLoc,
           SourceLocation ColonColonLoc, ParsedType ObjectType = ParsedType())
    : ObjectType(ObjectType), Identifier(II), IdentifierLoc(IdLoc),
      CCLoc(ColonColonLoc) {
  }

  NestedNameSpecInfo(IdentifierInfo *II, SourceLocation IdLoc,
                     SourceLocation ColonColonLoc, QualType ObjectType)
    : ObjectType(ParsedType::make(ObjectType)), Identifier(II),
      IdentifierLoc(IdLoc), CCLoc(ColonColonLoc) {
  }
};

bool isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS,
                                  NestedNameSpecInfo &IdInfo);

bool BuildCXXNestedNameSpecifier(Scope *S,
                                 NestedNameSpecInfo &IdInfo,
                                 bool EnteringContext,
                                 CXXScopeSpec &SS,
                                 NamedDecl *ScopeLookupResult,
                                 bool ErrorRecoveryLookup,
                                 bool *IsCorrectedToColon = nullptr,
                                 bool OnlyNamespace = false);

/// The parser has parsed a nested-name-specifier 'identifier::'.
///
/// \param S The scope in which this nested-name-specifier occurs.
///
/// \param IdInfo Parser information about an identifier in the
/// nested-name-spec.
///
/// \param EnteringContext Whether we're entering the context nominated by
/// this nested-name-specifier.
///
/// \param SS The nested-name-specifier, which is both an input
/// parameter (the nested-name-specifier before this type) and an
/// output parameter (containing the full nested-name-specifier,
/// including this new type).
///
/// \param ErrorRecoveryLookup If true, then this method is called to improve
/// error recovery. In this case do not emit error message.
///
/// \param IsCorrectedToColon If not null, suggestions to replace '::' -> ':'
/// are allowed.  The bool value pointed by this parameter is set to 'true'
/// if the identifier is treated as if it was followed by ':', not '::'.
///
/// \param OnlyNamespace If true, only considers namespaces in lookup.
///
/// \returns true if an error occurred, false otherwise.
bool ActOnCXXNestedNameSpecifier(Scope *S,
                                 NestedNameSpecInfo &IdInfo,
                                 bool EnteringContext,
                                 CXXScopeSpec &SS,
                                 bool ErrorRecoveryLookup = false,
                                 bool *IsCorrectedToColon = nullptr,
                                 bool OnlyNamespace = false);

ExprResult ActOnDecltypeExpression(Expr *E);

bool ActOnCXXNestedNameSpecifierDecltype(CXXScopeSpec &SS,
                                         const DeclSpec &DS,
                                         SourceLocation ColonColonLoc);

bool IsInvalidUnlessNestedName(Scope *S, CXXScopeSpec &SS,
                               NestedNameSpecInfo &IdInfo,
                               bool EnteringContext);

/// The parser has parsed a nested-name-specifier
/// 'template[opt] template-name < template-args >::'.
///
/// \param S The scope in which this nested-name-specifier occurs.
///
/// \param SS The nested-name-specifier, which is both an input
/// parameter (the nested-name-specifier before this type) and an
/// output parameter (containing the full nested-name-specifier,
/// including this new type).
///
/// \param TemplateKWLoc the location of the 'template' keyword, if any.
/// \param TemplateName the template name.
/// \param TemplateNameLoc The location of the template name.
/// \param LAngleLoc The location of the opening angle bracket  ('<').
/// \param TemplateArgs The template arguments.
/// \param RAngleLoc The location of the closing angle bracket  ('>').
/// \param CCLoc The location of the '::'.
///
/// \param EnteringContext Whether we're entering the context of the
/// nested-name-specifier.
///
///
/// \returns true if an error occurred, false otherwise.
bool ActOnCXXNestedNameSpecifier(Scope *S,
                                 CXXScopeSpec &SS,
                                 SourceLocation TemplateKWLoc,
                                 TemplateTy TemplateName,
                                 SourceLocation TemplateNameLoc,
                                 SourceLocation LAngleLoc,
                                 ASTTemplateArgsPtr TemplateArgs,
                                 SourceLocation RAngleLoc,
                                 SourceLocation CCLoc,
                                 bool EnteringContext);

/// Given a C++ nested-name-specifier, produce an annotation value
/// that the parser can use later to reconstruct the given
/// nested-name-specifier.
///
/// \param SS A nested-name-specifier.
///
/// \returns A pointer containing all of the information in the
/// nested-name-specifier \p SS.
void *SaveNestedNameSpecifierAnnotation(CXXScopeSpec &SS);

/// Given an annotation pointer for a nested-name-specifier, restore
/// the nested-name-specifier structure.
///
/// \param Annotation The annotation pointer, produced by
/// \c SaveNestedNameSpecifierAnnotation().
///
/// \param AnnotationRange The source range corresponding to the annotation.
///
/// \param SS The nested-name-specifier that will be updated with the contents
/// of the annotation pointer.
void RestoreNestedNameSpecifierAnnotation(void *Annotation,
                                          SourceRange AnnotationRange,
                                          CXXScopeSpec &SS);

bool ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS);

/// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global
/// scope or nested-name-specifier) is parsed, part of a declarator-id.
/// After this method is called, according to [C++ 3.4.3p3], names should be
/// looked up in the declarator-id's scope, until the declarator is parsed and
/// ActOnCXXExitDeclaratorScope is called.
/// The 'SS' should be a non-empty valid CXXScopeSpec.
bool ActOnCXXEnterDeclaratorScope(Scope *S, CXXScopeSpec &SS);

/// ActOnCXXExitDeclaratorScope - Called when a declarator that previously
/// invoked ActOnCXXEnterDeclaratorScope(), is finished. 'SS' is the same
/// CXXScopeSpec that was passed to ActOnCXXEnterDeclaratorScope as well.
/// Used to indicate that names should revert to being looked up in the
/// defining scope.
void ActOnCXXExitDeclaratorScope(Scope *S, const CXXScopeSpec &SS);

/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an
/// initializer for the declaration 'Dcl'.
/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
/// static data member of class X, names should be looked up in the scope of
/// class X.
void ActOnCXXEnterDeclInitializer(Scope *S, Decl *Dcl);

/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
/// initializer for the declaration 'Dcl'.
void ActOnCXXExitDeclInitializer(Scope *S, Decl *Dcl);

/// Create a new lambda closure type.
CXXRecordDecl *createLambdaClosureType(SourceRange IntroducerRange,
                                       TypeSourceInfo *Info,
                                       bool KnownDependent,
                                       LambdaCaptureDefault CaptureDefault);

/// Start the definition of a lambda expression.
CXXMethodDecl *startLambdaDefinition(CXXRecordDecl *Class,
                                     SourceRange IntroducerRange,
                                     TypeSourceInfo *MethodType,
                                     SourceLocation EndLoc,
                                     ArrayRef<ParmVarDecl *> Params,
                                     bool IsConstexprSpecified);

/// Endow the lambda scope info with the relevant properties.
void buildLambdaScope(sema::LambdaScopeInfo *LSI,
                      CXXMethodDecl *CallOperator,
                      SourceRange IntroducerRange,
                      LambdaCaptureDefault CaptureDefault,
                      SourceLocation CaptureDefaultLoc,
                      bool ExplicitParams,
                      bool ExplicitResultType,
                      bool Mutable);

/// Perform initialization analysis of the init-capture and perform
/// any implicit conversions such as an lvalue-to-rvalue conversion if
/// not being used to initialize a reference.
ParsedType actOnLambdaInitCaptureInitialization(
    SourceLocation Loc, bool ByRef, IdentifierInfo *Id,
    LambdaCaptureInitKind InitKind, Expr *&Init) {
  return ParsedType::make(buildLambdaInitCaptureInitialization(
      Loc, ByRef, Id, InitKind != LambdaCaptureInitKind::CopyInit, Init));
}
QualType buildLambdaInitCaptureInitialization(SourceLocation Loc, bool ByRef,
                                              IdentifierInfo *Id,
                                              bool DirectInit, Expr *&Init);

/// Create a dummy variable within the declcontext of the lambda's
///  call operator, for name lookup purposes for a lambda init capture.
///
///  CodeGen handles emission of lambda captures, ignoring these dummy
///  variables appropriately.
VarDecl *createLambdaInitCaptureVarDecl(SourceLocation Loc,
                                        QualType InitCaptureType,
                                        IdentifierInfo *Id,
                                        unsigned InitStyle, Expr *Init);

/// Build the implicit field for an init-capture.
FieldDecl *buildInitCaptureField(sema::LambdaScopeInfo *LSI, VarDecl *Var);

/// Note that we have finished the explicit captures for the
/// given lambda.
void finishLambdaExplicitCaptures(sema::LambdaScopeInfo *LSI);

/// \brief This is called after parsing the explicit template parameter list
/// on a lambda (if it exists) in C++2a.
void ActOnLambdaExplicitTemplateParameterList(SourceLocation LAngleLoc,
                                              ArrayRef<NamedDecl *> TParams,
                                              SourceLocation RAngleLoc);

/// Introduce the lambda parameters into scope.
void addLambdaParameters(
    ArrayRef<LambdaIntroducer::LambdaCapture> Captures,
    CXXMethodDecl *CallOperator, Scope *CurScope);

/// Deduce a block or lambda's return type based on the return
/// statements present in the body.
void deduceClosureReturnType(sema::CapturingScopeInfo &CSI);

/// ActOnStartOfLambdaDefinition - This is called just before we start
/// parsing the body of a lambda; it analyzes the explicit captures and
/// arguments, and sets up various data-structures for the body of the
/// lambda.
void ActOnStartOfLambdaDefinition(LambdaIntroducer &Intro,
                                  Declarator &ParamInfo, Scope *CurScope);

/// ActOnLambdaError - If there is an error parsing a lambda, this callback
/// is invoked to pop the information about the lambda.
void ActOnLambdaError(SourceLocation StartLoc, Scope *CurScope,
                      bool IsInstantiation = false);

/// ActOnLambdaExpr - This is called when the body of a lambda expression
/// was successfully completed.
ExprResult ActOnLambdaExpr(SourceLocation StartLoc, Stmt *Body,
                           Scope *CurScope);

/// Does copying/destroying the captured variable have side effects?
bool CaptureHasSideEffects(const sema::Capture &From);

/// Diagnose if an explicit lambda capture is unused. Returns true if a
/// diagnostic is emitted.
bool DiagnoseUnusedLambdaCapture(SourceRange CaptureRange,
                                 const sema::Capture &From);

/// Complete a lambda-expression having processed and attached the
/// lambda body.
ExprResult BuildLambdaExpr(SourceLocation StartLoc, SourceLocation EndLoc,
                           sema::LambdaScopeInfo *LSI);

/// Get the return type to use for a lambda's conversion function(s) to
/// function pointer type, given the type of the call operator.
QualType
getLambdaConversionFunctionResultType(const FunctionProtoType *CallOpType);

/// Define the "body" of the conversion from a lambda object to a
/// function pointer.
///
/// This routine doesn't actually define a sensible body; rather, it fills
/// in the initialization expression needed to copy the lambda object into
/// the block, and IR generation actually generates the real body of the
/// block pointer conversion.
void DefineImplicitLambdaToFunctionPointerConversion(
       SourceLocation CurrentLoc, CXXConversionDecl *Conv);

/// Define the "body" of the conversion from a lambda object to a
/// block pointer.
///
/// This routine doesn't actually define a sensible body; rather, it fills
/// in the initialization expression needed to copy the lambda object into
/// the block, and IR generation actually generates the real body of the
/// block pointer conversion.
void DefineImplicitLambdaToBlockPointerConversion(SourceLocation CurrentLoc,
                                                  CXXConversionDecl *Conv);

ExprResult BuildBlockForLambdaConversion(SourceLocation CurrentLocation,
                                         SourceLocation ConvLocation,
                                         CXXConversionDecl *Conv,
                                         Expr *Src);

// ParseObjCStringLiteral - Parse Objective-C string literals.
ExprResult ParseObjCStringLiteral(SourceLocation *AtLocs,
                                  ArrayRef<Expr *> Strings);

ExprResult BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S);

/// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
/// numeric literal expression. Type of the expression will be "NSNumber *"
/// or "id" if NSNumber is unavailable.
ExprResult BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number);
ExprResult ActOnObjCBoolLiteral(SourceLocation AtLoc, SourceLocation ValueLoc,
                                bool Value);
ExprResult BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements);

/// BuildObjCBoxedExpr - builds an ObjCBoxedExpr AST node for the
/// '@' prefixed parenthesized expression. The type of the expression will
/// either be "NSNumber *", "NSString *" or "NSValue *" depending on the type
/// of ValueType, which is allowed to be a built-in numeric type, "char *",
/// "const char *" or C structure with attribute 'objc_boxable'.
ExprResult BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr);

ExprResult BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
                                        Expr *IndexExpr,
                                        ObjCMethodDecl *getterMethod,
                                        ObjCMethodDecl *setterMethod);

ExprResult BuildObjCDictionaryLiteral(SourceRange SR,
                             MutableArrayRef<ObjCDictionaryElement> Elements);

ExprResult BuildObjCEncodeExpression(SourceLocation AtLoc,
                                TypeSourceInfo *EncodedTypeInfo,
                                SourceLocation RParenLoc);
ExprResult BuildCXXMemberCallExpr(Expr *Exp, NamedDecl *FoundDecl,
                                  CXXConversionDecl *Method,
                                  bool HadMultipleCandidates);

ExprResult ParseObjCEncodeExpression(SourceLocation AtLoc,
                                     SourceLocation EncodeLoc,
                                     SourceLocation LParenLoc,
                                     ParsedType Ty,
                                     SourceLocation RParenLoc);

/// ParseObjCSelectorExpression - Build selector expression for \@selector
ExprResult ParseObjCSelectorExpression(Selector Sel,
                                       SourceLocation AtLoc,
                                       SourceLocation SelLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation RParenLoc,
                                       bool WarnMultipleSelectors);

/// ParseObjCProtocolExpression - Build protocol expression for \@protocol
ExprResult ParseObjCProtocolExpression(IdentifierInfo * ProtocolName,
                                       SourceLocation AtLoc,
                                       SourceLocation ProtoLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation ProtoIdLoc,
                                       SourceLocation RParenLoc);

//===--------------------------------------------------------------------===//
// C++ Declarations
//
Decl *ActOnStartLinkageSpecification(Scope *S,
                                     SourceLocation ExternLoc,
                                     Expr *LangStr,
                                     SourceLocation LBraceLoc);
Decl *ActOnFinishLinkageSpecification(Scope *S,
                                      Decl *LinkageSpec,
                                      SourceLocation RBraceLoc);


//===--------------------------------------------------------------------===//
// C++ Classes
//
CXXRecordDecl *getCurrentClass(Scope *S, const CXXScopeSpec *SS);
bool isCurrentClassName(const IdentifierInfo &II, Scope *S,
                        const CXXScopeSpec *SS = nullptr);
bool isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS);

bool ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc,
                          SourceLocation ColonLoc,
                          const ParsedAttributesView &Attrs);

NamedDecl *ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS,
                               Declarator &D,
                               MultiTemplateParamsArg TemplateParameterLists,
                               Expr *BitfieldWidth, const VirtSpecifiers &VS,
                               InClassInitStyle InitStyle);

void ActOnStartCXXInClassMemberInitializer();
void ActOnFinishCXXInClassMemberInitializer(Decl *VarDecl,
                                            SourceLocation EqualLoc,
                                            Expr *Init);

MemInitResult ActOnMemInitializer(Decl *ConstructorD,
                                  Scope *S,
                                  CXXScopeSpec &SS,
                                  IdentifierInfo *MemberOrBase,
                                  ParsedType TemplateTypeTy,
                                  const DeclSpec &DS,
                                  SourceLocation IdLoc,
                                  SourceLocation LParenLoc,
                                  ArrayRef<Expr *> Args,
                                  SourceLocation RParenLoc,
                                  SourceLocation EllipsisLoc);

MemInitResult ActOnMemInitializer(Decl *ConstructorD,
                                  Scope *S,
                                  CXXScopeSpec &SS,
                                  IdentifierInfo *MemberOrBase,
                                  ParsedType TemplateTypeTy,
                                  const DeclSpec &DS,
                                  SourceLocation IdLoc,
                                  Expr *InitList,
                                  SourceLocation EllipsisLoc);

MemInitResult BuildMemInitializer(Decl *ConstructorD,
                                  Scope *S,
                                  CXXScopeSpec &SS,
                                  IdentifierInfo *MemberOrBase,
                                  ParsedType TemplateTypeTy,
                                  const DeclSpec &DS,
                                  SourceLocation IdLoc,
                                  Expr *Init,
                                  SourceLocation EllipsisLoc);

MemInitResult BuildMemberInitializer(ValueDecl *Member,
                                     Expr *Init,
                                     SourceLocation IdLoc);

MemInitResult BuildBaseInitializer(QualType BaseType,
                                   TypeSourceInfo *BaseTInfo,
                                   Expr *Init,
                                   CXXRecordDecl *ClassDecl,
                                   SourceLocation EllipsisLoc);

MemInitResult BuildDelegatingInitializer(TypeSourceInfo *TInfo,
                                         Expr *Init,
                                         CXXRecordDecl *ClassDecl);

bool SetDelegatingInitializer(CXXConstructorDecl *Constructor,
                              CXXCtorInitializer *Initializer);

bool SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
                         ArrayRef<CXXCtorInitializer *> Initializers = None);

void SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation);


/// MarkBaseAndMemberDestructorsReferenced - Given a record decl,
/// mark all the non-trivial destructors of its members and bases as
/// referenced.
void MarkBaseAndMemberDestructorsReferenced(SourceLocation Loc,
                                            CXXRecordDecl *Record);

/// The list of classes whose vtables have been used within
/// this translation unit, and the source locations at which the
/// first use occurred.
typedef std::pair<CXXRecordDecl*, SourceLocation> VTableUse;

/// The list of vtables that are required but have not yet been
/// materialized.
SmallVector<VTableUse, 16> VTableUses;

/// The set of classes whose vtables have been used within
/// this translation unit, and a bit that will be true if the vtable is
/// required to be emitted (otherwise, it should be emitted only if needed
/// by code generation).
llvm::DenseMap<CXXRecordDecl *, bool> VTablesUsed;

/// Load any externally-stored vtable uses.
void LoadExternalVTableUses();

/// Note that the vtable for the given class was used at the
/// given location.
void MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
                    bool DefinitionRequired = false);

/// Mark the exception specifications of all virtual member functions
/// in the given class as needed.
void MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
                                           const CXXRecordDecl *RD);

/// MarkVirtualMembersReferenced - Will mark all members of the given
/// CXXRecordDecl referenced.
void MarkVirtualMembersReferenced(SourceLocation Loc,
                                  const CXXRecordDecl *RD);

/// Define all of the vtables that have been used in this
/// translation unit and reference any virtual members used by those
/// vtables.
///
/// \returns true if any work was done, false otherwise.
bool DefineUsedVTables();

void AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl);

void ActOnMemInitializers(Decl *ConstructorDecl,
                          SourceLocation ColonLoc,
                          ArrayRef<CXXCtorInitializer*> MemInits,
                          bool AnyErrors);

/// Check class-level dllimport/dllexport attribute. The caller must
/// ensure that referenceDLLExportedClassMethods is called some point later
/// when all outer classes of Class are complete.
void checkClassLevelDLLAttribute(CXXRecordDecl *Class);
void checkClassLevelCodeSegAttribute(CXXRecordDecl *Class);

void referenceDLLExportedClassMethods();

void propagateDLLAttrToBaseClassTemplate(
    CXXRecordDecl *Class, Attr *ClassAttr,
    ClassTemplateSpecializationDecl *BaseTemplateSpec,
    SourceLocation BaseLoc);

void CheckCompletedCXXClass(CXXRecordDecl *Record);

/// Check that the C++ class annoated with "trivial_abi" satisfies all the
/// conditions that are needed for the attribute to have an effect.
void checkIllFormedTrivialABIStruct(CXXRecordDecl &RD);

void ActOnFinishCXXMemberSpecification(Scope *S, SourceLocation RLoc,
                                       Decl *TagDecl, SourceLocation LBrac,
                                       SourceLocation RBrac,
                                       const ParsedAttributesView &AttrList);
void ActOnFinishCXXMemberDecls();
void ActOnFinishCXXNonNestedClass(Decl *D);

void ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param);
unsigned ActOnReenterTemplateScope(Scope *S, Decl *Template);
void ActOnStartDelayedMemberDeclarations(Scope *S, Decl *Record);
void ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *Method);
void ActOnDelayedCXXMethodParameter(Scope *S, Decl *Param);
void ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *Record);
void ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *Method);
void ActOnFinishDelayedMemberInitializers(Decl *Record);
void MarkAsLateParsedTemplate(FunctionDecl *FD, Decl *FnD,
                              CachedTokens &Toks);
void UnmarkAsLateParsedTemplate(FunctionDecl *FD);
bool IsInsideALocalClassWithinATemplateFunction();

Decl *ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
                                   Expr *AssertExpr,
                                   Expr *AssertMessageExpr,
                                   SourceLocation RParenLoc);
Decl *BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
                                   Expr *AssertExpr,
                                   StringLiteral *AssertMessageExpr,
                                   SourceLocation RParenLoc,
                                   bool Failed);

FriendDecl *CheckFriendTypeDecl(SourceLocation LocStart,
                                SourceLocation FriendLoc,
                                TypeSourceInfo *TSInfo);
Decl *ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
                          MultiTemplateParamsArg TemplateParams);
NamedDecl *ActOnFriendFunctionDecl(Scope *S, Declarator &D,
                                   MultiTemplateParamsArg TemplateParams);

QualType CheckConstructorDeclarator(Declarator &D, QualType R,
                                    StorageClass& SC);
void CheckConstructor(CXXConstructorDecl *Constructor);
QualType CheckDestructorDeclarator(Declarator &D, QualType R,
                                   StorageClass& SC);
bool CheckDestructor(CXXDestructorDecl *Destructor);
void CheckConversionDeclarator(Declarator &D, QualType &R,
                               StorageClass& SC);
Decl *ActOnConversionDeclarator(CXXConversionDecl *Conversion);
void CheckDeductionGuideDeclarator(Declarator &D, QualType &R,
                                   StorageClass &SC);
void CheckDeductionGuideTemplate(FunctionTemplateDecl *TD);

void CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD);
void CheckDelayedMemberExceptionSpecs();

//===--------------------------------------------------------------------===//
// C++ Derived Classes
//

/// ActOnBaseSpecifier - Parsed a base specifier
CXXBaseSpecifier *CheckBaseSpecifier(CXXRecordDecl *Class,
                                     SourceRange SpecifierRange,
                                     bool Virtual, AccessSpecifier Access,
                                     TypeSourceInfo *TInfo,
                                     SourceLocation EllipsisLoc);

BaseResult ActOnBaseSpecifier(Decl *classdecl,
                              SourceRange SpecifierRange,
                              ParsedAttributes &Attrs,
                              bool Virtual, AccessSpecifier Access,
                              ParsedType basetype,
                              SourceLocation BaseLoc,
                              SourceLocation EllipsisLoc);

bool AttachBaseSpecifiers(CXXRecordDecl *Class,
                          MutableArrayRef<CXXBaseSpecifier *> Bases);
void ActOnBaseSpecifiers(Decl *ClassDecl,
                         MutableArrayRef<CXXBaseSpecifier *> Bases);

bool IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base);
bool IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base,
                   CXXBasePaths &Paths);

// FIXME: I don't like this name.
void BuildBasePathArray(const CXXBasePaths &Paths, CXXCastPath &BasePath);

bool CheckDerivedToBaseConversion(QualType Derived, QualType Base,
                                  SourceLocation Loc, SourceRange Range,
                                  CXXCastPath *BasePath = nullptr,
                                  bool IgnoreAccess = false);
bool CheckDerivedToBaseConversion(QualType Derived, QualType Base,
                                  unsigned InaccessibleBaseID,
                                  unsigned AmbigiousBaseConvID,
                                  SourceLocation Loc, SourceRange Range,
                                  DeclarationName Name,
                                  CXXCastPath *BasePath,
                                  bool IgnoreAccess = false);

std::string getAmbiguousPathsDisplayString(CXXBasePaths &Paths);

bool CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
                                       const CXXMethodDecl *Old);

/// CheckOverridingFunctionReturnType - Checks whether the return types are
/// covariant, according to C++ [class.virtual]p5.
bool CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
                                       const CXXMethodDecl *Old);

/// CheckOverridingFunctionExceptionSpec - Checks whether the exception
/// spec is a subset of base spec.
bool CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New,
                                          const CXXMethodDecl *Old);

bool CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange);

/// CheckOverrideControl - Check C++11 override control semantics.
void CheckOverrideControl(NamedDecl *D);

/// DiagnoseAbsenceOfOverrideControl - Diagnose if 'override' keyword was
/// not used in the declaration of an overriding method.
void DiagnoseAbsenceOfOverrideControl(NamedDecl *D);

/// CheckForFunctionMarkedFinal - Checks whether a virtual member function
/// overrides a virtual member function marked 'final', according to
/// C++11 [class.virtual]p4.
bool CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
                                            const CXXMethodDecl *Old);


//===--------------------------------------------------------------------===//
// C++ Access Control
//

enum AccessResult {
  AR_accessible,
  AR_inaccessible,
  AR_dependent,
  AR_delayed
};

bool SetMemberAccessSpecifier(NamedDecl *MemberDecl,
                              NamedDecl *PrevMemberDecl,
                              AccessSpecifier LexicalAS);

AccessResult CheckUnresolvedMemberAccess(UnresolvedMemberExpr *E,
                                         DeclAccessPair FoundDecl);
AccessResult CheckUnresolvedLookupAccess(UnresolvedLookupExpr *E,
                                         DeclAccessPair FoundDecl);
AccessResult CheckAllocationAccess(SourceLocation OperatorLoc,
                                   SourceRange PlacementRange,
                                   CXXRecordDecl *NamingClass,
                                   DeclAccessPair FoundDecl,
                                   bool Diagnose = true);
AccessResult CheckConstructorAccess(SourceLocation Loc,
                                    CXXConstructorDecl *D,
                                    DeclAccessPair FoundDecl,
                                    const InitializedEntity &Entity,
                                    bool IsCopyBindingRefToTemp = false);
AccessResult CheckConstructorAccess(SourceLocation Loc,
                                    CXXConstructorDecl *D,
                                    DeclAccessPair FoundDecl,
                                    const InitializedEntity &Entity,
                                    const PartialDiagnostic &PDiag);
AccessResult CheckDestructorAccess(SourceLocation Loc,
                                   CXXDestructorDecl *Dtor,
                                   const PartialDiagnostic &PDiag,
                                   QualType objectType = QualType());
AccessResult CheckFriendAccess(NamedDecl *D);
AccessResult CheckMemberAccess(SourceLocation UseLoc,
                               CXXRecordDecl *NamingClass,
                               DeclAccessPair Found);
AccessResult
CheckStructuredBindingMemberAccess(SourceLocation UseLoc,
                                   CXXRecordDecl *DecomposedClass,
                                   DeclAccessPair Field);
AccessResult CheckMemberOperatorAccess(SourceLocation Loc,
                                       Expr *ObjectExpr,
                                       Expr *ArgExpr,
                                       DeclAccessPair FoundDecl);
AccessResult CheckAddressOfMemberAccess(Expr *OvlExpr,
                                        DeclAccessPair FoundDecl);
AccessResult CheckBaseClassAccess(SourceLocation AccessLoc,
                                  QualType Base, QualType Derived,
                                  const CXXBasePath &Path,
                                  unsigned DiagID,
                                  bool ForceCheck = false,
                                  bool ForceUnprivileged = false);
void CheckLookupAccess(const LookupResult &R);
bool IsSimplyAccessible(NamedDecl *Decl, CXXRecordDecl *NamingClass,
                        QualType BaseType);
bool isSpecialMemberAccessibleForDeletion(CXXMethodDecl *decl,
                                          AccessSpecifier access,
                                          QualType objectType);

void HandleDependentAccessCheck(const DependentDiagnostic &DD,
                       const MultiLevelTemplateArgumentList &TemplateArgs);
void PerformDependentDiagnostics(const DeclContext *Pattern,
                      const MultiLevelTemplateArgumentList &TemplateArgs);

void HandleDelayedAccessCheck(sema::DelayedDiagnostic &DD, Decl *Ctx);

/// When true, access checking violations are treated as SFINAE
/// failures rather than hard errors.
bool AccessCheckingSFINAE;

enum AbstractDiagSelID {
  AbstractNone = -1,
  AbstractReturnType,
  AbstractParamType,
  AbstractVariableType,
  AbstractFieldType,
  AbstractIvarType,
  AbstractSynthesizedIvarType,
  AbstractArrayType
};

bool isAbstractType(SourceLocation Loc, QualType T);
bool RequireNonAbstractType(SourceLocation Loc, QualType T,
                            TypeDiagnoser &Diagnoser);
template <typename... Ts>
bool RequireNonAbstractType(SourceLocation Loc, QualType T, unsigned DiagID,
                            const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireNonAbstractType(Loc, T, Diagnoser);
}

void DiagnoseAbstractType(const CXXRecordDecl *RD);

//===--------------------------------------------------------------------===//
// C++ Overloaded Operators [C++ 13.5]
//

bool CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl);

bool CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl);

//===--------------------------------------------------------------------===//
// C++ Templates [C++ 14]
//
void FilterAcceptableTemplateNames(LookupResult &R,
                                   bool AllowFunctionTemplates = true,
                                   bool AllowDependent = true);
bool hasAnyAcceptableTemplateNames(LookupResult &R,
                                   bool AllowFunctionTemplates = true,
                                   bool AllowDependent = true,
                                   bool AllowNonTemplateFunctions = false);
/// Try to interpret the lookup result D as a template-name.
///
/// \param D A declaration found by name lookup.
/// \param AllowFunctionTemplates Whether function templates should be
///        considered valid results.
/// \param AllowDependent Whether unresolved using declarations (that might
///        name templates) should be considered valid results.
NamedDecl *getAsTemplateNameDecl(NamedDecl *D,
                                 bool AllowFunctionTemplates = true,
                                 bool AllowDependent = true);

enum class AssumedTemplateKind {
  /// This is not assumed to be a template name.
  None,
  /// This is assumed to be a template name because lookup found nothing.
  FoundNothing,
  /// This is assumed to be a template name because lookup found one or more
  /// functions (but no function templates).
  FoundFunctions,
};
bool LookupTemplateName(LookupResult &R, Scope *S, CXXScopeSpec &SS,
                        QualType ObjectType, bool EnteringContext,
                        bool &MemberOfUnknownSpecialization,
                        SourceLocation TemplateKWLoc = SourceLocation(),
                        AssumedTemplateKind *ATK = nullptr);

TemplateNameKind isTemplateName(Scope *S,
                                CXXScopeSpec &SS,
                                bool hasTemplateKeyword,
                                const UnqualifiedId &Name,
                                ParsedType ObjectType,
                                bool EnteringContext,
                                TemplateTy &Template,
                                bool &MemberOfUnknownSpecialization);

/// Try to resolve an undeclared template name as a type template.
///
/// Sets II to the identifier corresponding to the template name, and updates
/// Name to a corresponding (typo-corrected) type template name and TNK to
/// the corresponding kind, if possible.
void ActOnUndeclaredTypeTemplateName(Scope *S, TemplateTy &Name,
                                     TemplateNameKind &TNK,
                                     SourceLocation NameLoc,
                                     IdentifierInfo *&II);

bool resolveAssumedTemplateNameAsType(Scope *S, TemplateName &Name,
                                      SourceLocation NameLoc,
                                      bool Diagnose = true);

/// Determine whether a particular identifier might be the name in a C++1z
/// deduction-guide declaration.
bool isDeductionGuideName(Scope *S, const IdentifierInfo &Name,
                          SourceLocation NameLoc,
                          ParsedTemplateTy *Template = nullptr);

bool DiagnoseUnknownTemplateName(const IdentifierInfo &II,
                                 SourceLocation IILoc,
                                 Scope *S,
                                 const CXXScopeSpec *SS,
                                 TemplateTy &SuggestedTemplate,
                                 TemplateNameKind &SuggestedKind);

bool DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
                                    NamedDecl *Instantiation,
                                    bool InstantiatedFromMember,
                                    const NamedDecl *Pattern,
                                    const NamedDecl *PatternDef,
                                    TemplateSpecializationKind TSK,
                                    bool Complain = true);

void DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl);
TemplateDecl *AdjustDeclIfTemplate(Decl *&Decl);

NamedDecl *ActOnTypeParameter(Scope *S, bool Typename,
                         SourceLocation EllipsisLoc,
                         SourceLocation KeyLoc,
                         IdentifierInfo *ParamName,
                         SourceLocation ParamNameLoc,
                         unsigned Depth, unsigned Position,
                         SourceLocation EqualLoc,
                         ParsedType DefaultArg);

QualType CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI,
                                           SourceLocation Loc);
QualType CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc);

NamedDecl *ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
                                    unsigned Depth,
                                    unsigned Position,
                                    SourceLocation EqualLoc,
                                    Expr *DefaultArg);
NamedDecl *ActOnTemplateTemplateParameter(Scope *S,
                                     SourceLocation TmpLoc,
                                     TemplateParameterList *Params,
                                     SourceLocation EllipsisLoc,
                                     IdentifierInfo *ParamName,
                                     SourceLocation ParamNameLoc,
                                     unsigned Depth,
                                     unsigned Position,
                                     SourceLocation EqualLoc,
                                     ParsedTemplateArgument DefaultArg);

TemplateParameterList *
ActOnTemplateParameterList(unsigned Depth,
                           SourceLocation ExportLoc,
                           SourceLocation TemplateLoc,
                           SourceLocation LAngleLoc,
                           ArrayRef<NamedDecl *> Params,
                           SourceLocation RAngleLoc,
                           Expr *RequiresClause);

/// The context in which we are checking a template parameter list.
enum TemplateParamListContext {
  TPC_ClassTemplate,
  TPC_VarTemplate,
  TPC_FunctionTemplate,
  TPC_ClassTemplateMember,
  TPC_FriendClassTemplate,
  TPC_FriendFunctionTemplate,
  TPC_FriendFunctionTemplateDefinition,
  TPC_TypeAliasTemplate
};

bool CheckTemplateParameterList(TemplateParameterList *NewParams,
                                TemplateParameterList *OldParams,
                                TemplateParamListContext TPC,
                                SkipBodyInfo *SkipBody = nullptr);
TemplateParameterList *MatchTemplateParametersToScopeSpecifier(
    SourceLocation DeclStartLoc, SourceLocation DeclLoc,
    const CXXScopeSpec &SS, TemplateIdAnnotation *TemplateId,
    ArrayRef<TemplateParameterList *> ParamLists,
    bool IsFriend, bool &IsMemberSpecialization, bool &Invalid);

DeclResult CheckClassTemplate(
    Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc,
    CXXScopeSpec &SS, IdentifierInfo *Name, SourceLocation NameLoc,
    const ParsedAttributesView &Attr, TemplateParameterList *TemplateParams,
    AccessSpecifier AS, SourceLocation ModulePrivateLoc,
    SourceLocation FriendLoc, unsigned NumOuterTemplateParamLists,
    TemplateParameterList **OuterTemplateParamLists,
    SkipBodyInfo *SkipBody = nullptr);

TemplateArgumentLoc getTrivialTemplateArgumentLoc(const TemplateArgument &Arg,
                                                  QualType NTTPType,
                                                  SourceLocation Loc);

void translateTemplateArguments(const ASTTemplateArgsPtr &In,
                                TemplateArgumentListInfo &Out);

ParsedTemplateArgument ActOnTemplateTypeArgument(TypeResult ParsedType);

void NoteAllFoundTemplates(TemplateName Name);

QualType CheckTemplateIdType(TemplateName Template,
                             SourceLocation TemplateLoc,
                            TemplateArgumentListInfo &TemplateArgs);

TypeResult
ActOnTemplateIdType(Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
                    TemplateTy Template, IdentifierInfo *TemplateII,
                    SourceLocation TemplateIILoc, SourceLocation LAngleLoc,
                    ASTTemplateArgsPtr TemplateArgs, SourceLocation RAngleLoc,
                    bool IsCtorOrDtorName = false, bool IsClassName = false);

/// Parsed an elaborated-type-specifier that refers to a template-id,
/// such as \c class T::template apply<U>.
TypeResult ActOnTagTemplateIdType(TagUseKind TUK,
                                  TypeSpecifierType TagSpec,
                                  SourceLocation TagLoc,
                                  CXXScopeSpec &SS,
                                  SourceLocation TemplateKWLoc,
                                  TemplateTy TemplateD,
                                  SourceLocation TemplateLoc,
                                  SourceLocation LAngleLoc,
                                  ASTTemplateArgsPtr TemplateArgsIn,
                                  SourceLocation RAngleLoc);

DeclResult ActOnVarTemplateSpecialization(
    Scope *S, Declarator &D, TypeSourceInfo *DI,
    SourceLocation TemplateKWLoc, TemplateParameterList *TemplateParams,
    StorageClass SC, bool IsPartialSpecialization);

DeclResult CheckVarTemplateId(VarTemplateDecl *Template,
                              SourceLocation TemplateLoc,
                              SourceLocation TemplateNameLoc,
                              const TemplateArgumentListInfo &TemplateArgs);

ExprResult CheckVarTemplateId(const CXXScopeSpec &SS,
                              const DeclarationNameInfo &NameInfo,
                              VarTemplateDecl *Template,
                              SourceLocation TemplateLoc,
                              const TemplateArgumentListInfo *TemplateArgs);

void diagnoseMissingTemplateArguments(TemplateName Name, SourceLocation Loc);

ExprResult BuildTemplateIdExpr(const CXXScopeSpec &SS,
                               SourceLocation TemplateKWLoc,
                               LookupResult &R,
                               bool RequiresADL,
                             const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
                                        SourceLocation TemplateKWLoc,
                             const DeclarationNameInfo &NameInfo,
                             const TemplateArgumentListInfo *TemplateArgs);

TemplateNameKind ActOnDependentTemplateName(
    Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
    const UnqualifiedId &Name, ParsedType ObjectType, bool EnteringContext,
    TemplateTy &Template, bool AllowInjectedClassName = false);

DeclResult ActOnClassTemplateSpecialization(
    Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc,
    SourceLocation ModulePrivateLoc, TemplateIdAnnotation &TemplateId,
    const ParsedAttributesView &Attr,
    MultiTemplateParamsArg TemplateParameterLists,
    SkipBodyInfo *SkipBody = nullptr);

bool CheckTemplatePartialSpecializationArgs(SourceLocation Loc,
                                            TemplateDecl *PrimaryTemplate,
                                            unsigned NumExplicitArgs,
                                            ArrayRef<TemplateArgument> Args);
void CheckTemplatePartialSpecialization(
    ClassTemplatePartialSpecializationDecl *Partial);
void CheckTemplatePartialSpecialization(
    VarTemplatePartialSpecializationDecl *Partial);

Decl *ActOnTemplateDeclarator(Scope *S,
                              MultiTemplateParamsArg TemplateParameterLists,
                              Declarator &D);

bool
CheckSpecializationInstantiationRedecl(SourceLocation NewLoc,
                                       TemplateSpecializationKind NewTSK,
                                       NamedDecl *PrevDecl,
                                       TemplateSpecializationKind PrevTSK,
                                       SourceLocation PrevPtOfInstantiation,
                                       bool &SuppressNew);

bool CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD,
                  const TemplateArgumentListInfo &ExplicitTemplateArgs,
                                                  LookupResult &Previous);

bool CheckFunctionTemplateSpecialization(
    FunctionDecl *FD, TemplateArgumentListInfo *ExplicitTemplateArgs,
    LookupResult &Previous, bool QualifiedFriend = false);
bool CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous);
void CompleteMemberSpecialization(NamedDecl *Member, LookupResult &Previous);

DeclResult ActOnExplicitInstantiation(
    Scope *S, SourceLocation ExternLoc, SourceLocation TemplateLoc,
    unsigned TagSpec, SourceLocation KWLoc, const CXXScopeSpec &SS,
    TemplateTy Template, SourceLocation TemplateNameLoc,
    SourceLocation LAngleLoc, ASTTemplateArgsPtr TemplateArgs,
    SourceLocation RAngleLoc, const ParsedAttributesView &Attr);

DeclResult ActOnExplicitInstantiation(Scope *S, SourceLocation ExternLoc,
                                      SourceLocation TemplateLoc,
                                      unsigned TagSpec, SourceLocation KWLoc,
                                      CXXScopeSpec &SS, IdentifierInfo *Name,
                                      SourceLocation NameLoc,
                                      const ParsedAttributesView &Attr);

DeclResult ActOnExplicitInstantiation(Scope *S,
                                      SourceLocation ExternLoc,
                                      SourceLocation TemplateLoc,
                                      Declarator &D);

TemplateArgumentLoc
SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
                                        SourceLocation TemplateLoc,
                                        SourceLocation RAngleLoc,
                                        Decl *Param,
                                        SmallVectorImpl<TemplateArgument>
                                          &Converted,
                                        bool &HasDefaultArg);

/// Specifies the context in which a particular template
/// argument is being checked.
enum CheckTemplateArgumentKind {
  /// The template argument was specified in the code or was
  /// instantiated with some deduced template arguments.
  CTAK_Specified,

  /// The template argument was deduced via template argument
  /// deduction.
  CTAK_Deduced,

  /// The template argument was deduced from an array bound
  /// via template argument deduction.
  CTAK_DeducedFromArrayBound
};

bool CheckTemplateArgument(NamedDecl *Param,
                           TemplateArgumentLoc &Arg,
                           NamedDecl *Template,
                           SourceLocation TemplateLoc,
                           SourceLocation RAngleLoc,
                           unsigned ArgumentPackIndex,
                         SmallVectorImpl<TemplateArgument> &Converted,
                           CheckTemplateArgumentKind CTAK = CTAK_Specified);

/// Check that the given template arguments can be be provided to
/// the given template, converting the arguments along the way.
///
/// \param Template The template to which the template arguments are being
/// provided.
///
/// \param TemplateLoc The location of the template name in the source.
///
/// \param TemplateArgs The list of template arguments. If the template is
/// a template template parameter, this function may extend the set of
/// template arguments to also include substituted, defaulted template
/// arguments.
///
/// \param PartialTemplateArgs True if the list of template arguments is
/// intentionally partial, e.g., because we're checking just the initial
/// set of template arguments.
///
/// \param Converted Will receive the converted, canonicalized template
/// arguments.
///
/// \param UpdateArgsWithConversions If \c true, update \p TemplateArgs to
/// contain the converted forms of the template arguments as written.
/// Otherwise, \p TemplateArgs will not be modified.
///
/// \returns true if an error occurred, false otherwise.
bool CheckTemplateArgumentList(TemplateDecl *Template,
                               SourceLocation TemplateLoc,
                               TemplateArgumentListInfo &TemplateArgs,
                               bool PartialTemplateArgs,
                               SmallVectorImpl<TemplateArgument> &Converted,
                               bool UpdateArgsWithConversions = true);

bool CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
                               TemplateArgumentLoc &Arg,
                         SmallVectorImpl<TemplateArgument> &Converted);

bool CheckTemplateArgument(TemplateTypeParmDecl *Param,
                           TypeSourceInfo *Arg);
ExprResult CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
                                 QualType InstantiatedParamType, Expr *Arg,
                                 TemplateArgument &Converted,
                             CheckTemplateArgumentKind CTAK = CTAK_Specified);
bool CheckTemplateTemplateArgument(TemplateParameterList *Params,
                                   TemplateArgumentLoc &Arg);

ExprResult
BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg,
                                        QualType ParamType,
                                        SourceLocation Loc);
ExprResult
BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg,
                                            SourceLocation Loc);

/// Enumeration describing how template parameter lists are compared
/// for equality.
enum TemplateParameterListEqualKind {
  /// We are matching the template parameter lists of two templates
  /// that might be redeclarations.
  ///
  /// \code
  /// template<typename T> struct X;
  /// template<typename T> struct X;
  /// \endcode
  TPL_TemplateMatch,

  /// We are matching the template parameter lists of two template
  /// template parameters as part of matching the template parameter lists
  /// of two templates that might be redeclarations.
  ///
  /// \code
  /// template<template<int I> class TT> struct X;
  /// template<template<int Value> class Other> struct X;
  /// \endcode
  TPL_TemplateTemplateParmMatch,

  /// We are matching the template parameter lists of a template
  /// template argument against the template parameter lists of a template
  /// template parameter.
  ///
  /// \code
  /// template<template<int Value> class Metafun> struct X;
  /// template<int Value> struct integer_c;
  /// X<integer_c> xic;
  /// \endcode
  TPL_TemplateTemplateArgumentMatch
};

bool TemplateParameterListsAreEqual(TemplateParameterList *New,
                                    TemplateParameterList *Old,
                                    bool Complain,
                                    TemplateParameterListEqualKind Kind,
                                    SourceLocation TemplateArgLoc
                                      = SourceLocation());

bool CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams);

/// Called when the parser has parsed a C++ typename
/// specifier, e.g., "typename T::type".
///
/// \param S The scope in which this typename type occurs.
/// \param TypenameLoc the location of the 'typename' keyword
/// \param SS the nested-name-specifier following the typename (e.g., 'T::').
/// \param II the identifier we're retrieving (e.g., 'type' in the example).
/// \param IdLoc the location of the identifier.
TypeResult
ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
                  const CXXScopeSpec &SS, const IdentifierInfo &II,
                  SourceLocation IdLoc);

/// Called when the parser has parsed a C++ typename
/// specifier that ends in a template-id, e.g.,
/// "typename MetaFun::template apply<T1, T2>".
///
/// \param S The scope in which this typename type occurs.
/// \param TypenameLoc the location of the 'typename' keyword
/// \param SS the nested-name-specifier following the typename (e.g., 'T::').
/// \param TemplateLoc the location of the 'template' keyword, if any.
/// \param TemplateName The template name.
/// \param TemplateII The identifier used to name the template.
/// \param TemplateIILoc The location of the template name.
/// \param LAngleLoc The location of the opening angle bracket  ('<').
/// \param TemplateArgs The template arguments.
/// \param RAngleLoc The location of the closing angle bracket  ('>').
TypeResult
ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
                  const CXXScopeSpec &SS,
                  SourceLocation TemplateLoc,
                  TemplateTy TemplateName,
                  IdentifierInfo *TemplateII,
                  SourceLocation TemplateIILoc,
                  SourceLocation LAngleLoc,
                  ASTTemplateArgsPtr TemplateArgs,
                  SourceLocation RAngleLoc);

QualType CheckTypenameType(ElaboratedTypeKeyword Keyword,
                           SourceLocation KeywordLoc,
                           NestedNameSpecifierLoc QualifierLoc,
                           const IdentifierInfo &II,
                           SourceLocation IILoc);

TypeSourceInfo *RebuildTypeInCurrentInstantiation(TypeSourceInfo *T,
                                                  SourceLocation Loc,
                                                  DeclarationName Name);
bool RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS);

ExprResult RebuildExprInCurrentInstantiation(Expr *E);
bool RebuildTemplateParamsInCurrentInstantiation(
                                              TemplateParameterList *Params);

std::string
getTemplateArgumentBindingsText(const TemplateParameterList *Params,
                                const TemplateArgumentList &Args);

std::string
getTemplateArgumentBindingsText(const TemplateParameterList *Params,
                                const TemplateArgument *Args,
                                unsigned NumArgs);

//===--------------------------------------------------------------------===//
// C++ Variadic Templates (C++0x [temp.variadic])
//===--------------------------------------------------------------------===//

/// Determine whether an unexpanded parameter pack might be permitted in this
/// location. Useful for error recovery.
bool isUnexpandedParameterPackPermitted();

/// The context in which an unexpanded parameter pack is
/// being diagnosed.
///
/// Note that the values of this enumeration line up with the first
/// argument to the \c err_unexpanded_parameter_pack diagnostic.
enum UnexpandedParameterPackContext {
  /// An arbitrary expression.
  UPPC_Expression = 0,

  /// The base type of a class type.
  UPPC_BaseType,

  /// The type of an arbitrary declaration.
  UPPC_DeclarationType,

  /// The type of a data member.
  UPPC_DataMemberType,

  /// The size of a bit-field.
  UPPC_BitFieldWidth,

  /// The expression in a static assertion.
  UPPC_StaticAssertExpression,

  /// The fixed underlying type of an enumeration.
  UPPC_FixedUnderlyingType,

  /// The enumerator value.
  UPPC_EnumeratorValue,

  /// A using declaration.
  UPPC_UsingDeclaration,

  /// A friend declaration.
  UPPC_FriendDeclaration,

  /// A declaration qualifier.
  UPPC_DeclarationQualifier,

  /// An initializer.
  UPPC_Initializer,

  /// A default argument.
  UPPC_DefaultArgument,

  /// The type of a non-type template parameter.
  UPPC_NonTypeTemplateParameterType,

  /// The type of an exception.
  UPPC_ExceptionType,

  /// Partial specialization.
  UPPC_PartialSpecialization,

  /// Microsoft __if_exists.
  UPPC_IfExists,

  /// Microsoft __if_not_exists.
  UPPC_IfNotExists,

  /// Lambda expression.
  UPPC_Lambda,

  /// Block expression,
  UPPC_Block
};

/// Diagnose unexpanded parameter packs.
///
/// \param Loc The location at which we should emit the diagnostic.
///
/// \param UPPC The context in which we are diagnosing unexpanded
/// parameter packs.
///
/// \param Unexpanded the set of unexpanded parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPacks(SourceLocation Loc,
                                      UnexpandedParameterPackContext UPPC,
                                ArrayRef<UnexpandedParameterPack> Unexpanded);

/// If the given type contains an unexpanded parameter pack,
/// diagnose the error.
///
/// \param Loc The source location where a diagnostc should be emitted.
///
/// \param T The type that is being checked for unexpanded parameter
/// packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(SourceLocation Loc, TypeSourceInfo *T,
                                     UnexpandedParameterPackContext UPPC);

/// If the given expression contains an unexpanded parameter
/// pack, diagnose the error.
///
/// \param E The expression that is being checked for unexpanded
/// parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(Expr *E,
                     UnexpandedParameterPackContext UPPC = UPPC_Expression);

/// If the given nested-name-specifier contains an unexpanded
/// parameter pack, diagnose the error.
///
/// \param SS The nested-name-specifier that is being checked for
/// unexpanded parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(const CXXScopeSpec &SS,
                                     UnexpandedParameterPackContext UPPC);

/// If the given name contains an unexpanded parameter pack,
/// diagnose the error.
///
/// \param NameInfo The name (with source location information) that
/// is being checked for unexpanded parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(const DeclarationNameInfo &NameInfo,
                                     UnexpandedParameterPackContext UPPC);

/// If the given template name contains an unexpanded parameter pack,
/// diagnose the error.
///
/// \param Loc The location of the template name.
///
/// \param Template The template name that is being checked for unexpanded
/// parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(SourceLocation Loc,
                                     TemplateName Template,
                                     UnexpandedParameterPackContext UPPC);

/// If the given template argument contains an unexpanded parameter
/// pack, diagnose the error.
///
/// \param Arg The template argument that is being checked for unexpanded
/// parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(TemplateArgumentLoc Arg,
                                     UnexpandedParameterPackContext UPPC);

/// Collect the set of unexpanded parameter packs within the given
/// template argument.
///
/// \param Arg The template argument that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(TemplateArgument Arg,
                 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// Collect the set of unexpanded parameter packs within the given
/// template argument.
///
/// \param Arg The template argument that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(TemplateArgumentLoc Arg,
                  SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// Collect the set of unexpanded parameter packs within the given
/// type.
///
/// \param T The type that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(QualType T,
                 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// Collect the set of unexpanded parameter packs within the given
/// type.
///
/// \param TL The type that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(TypeLoc TL,
                 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// Collect the set of unexpanded parameter packs within the given
/// nested-name-specifier.
///
/// \param NNS The nested-name-specifier that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(NestedNameSpecifierLoc NNS,
                       SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// Collect the set of unexpanded parameter packs within the given
/// name.
///
/// \param NameInfo The name that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(const DeclarationNameInfo &NameInfo,
                       SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// Invoked when parsing a template argument followed by an
/// ellipsis, which creates a pack expansion.
///
/// \param Arg The template argument preceding the ellipsis, which
/// may already be invalid.
///
/// \param EllipsisLoc The location of the ellipsis.
ParsedTemplateArgument ActOnPackExpansion(const ParsedTemplateArgument &Arg,
                                          SourceLocation EllipsisLoc);

/// Invoked when parsing a type followed by an ellipsis, which
/// creates a pack expansion.
///
/// \param Type The type preceding the ellipsis, which will become
/// the pattern of the pack expansion.
///
/// \param EllipsisLoc The location of the ellipsis.
TypeResult ActOnPackExpansion(ParsedType Type, SourceLocation EllipsisLoc);

/// Construct a pack expansion type from the pattern of the pack
/// expansion.
TypeSourceInfo *CheckPackExpansion(TypeSourceInfo *Pattern,
                                   SourceLocation EllipsisLoc,
                                   Optional<unsigned> NumExpansions);

/// Construct a pack expansion type from the pattern of the pack
/// expansion.
QualType CheckPackExpansion(QualType Pattern,
                            SourceRange PatternRange,
                            SourceLocation EllipsisLoc,
                            Optional<unsigned> NumExpansions);

/// Invoked when parsing an expression followed by an ellipsis, which
/// creates a pack expansion.
///
/// \param Pattern The expression preceding the ellipsis, which will become
/// the pattern of the pack expansion.
///
/// \param EllipsisLoc The location of the ellipsis.
ExprResult ActOnPackExpansion(Expr *Pattern, SourceLocation EllipsisLoc);

/// Invoked when parsing an expression followed by an ellipsis, which
/// creates a pack expansion.
///
/// \param Pattern The expression preceding the ellipsis, which will become
/// the pattern of the pack expansion.
///
/// \param EllipsisLoc The location of the ellipsis.
ExprResult CheckPackExpansion(Expr *Pattern, SourceLocation EllipsisLoc,
                              Optional<unsigned> NumExpansions);

/// Determine whether we could expand a pack expansion with the
/// given set of parameter packs into separate arguments by repeatedly
/// transforming the pattern.
///
/// \param EllipsisLoc The location of the ellipsis that identifies the
/// pack expansion.
///
/// \param PatternRange The source range that covers the entire pattern of
/// the pack expansion.
///
/// \param Unexpanded The set of unexpanded parameter packs within the
/// pattern.
///
/// \param ShouldExpand Will be set to \c true if the transformer should
/// expand the corresponding pack expansions into separate arguments. When
/// set, \c NumExpansions must also be set.
///
/// \param RetainExpansion Whether the caller should add an unexpanded
/// pack expansion after all of the expanded arguments. This is used
/// when extending explicitly-specified template argument packs per
/// C++0x [temp.arg.explicit]p9.
///
/// \param NumExpansions The number of separate arguments that will be in
/// the expanded form of the corresponding pack expansion. This is both an
/// input and an output parameter, which can be set by the caller if the
/// number of expansions is known a priori (e.g., due to a prior substitution)
/// and will be set by the callee when the number of expansions is known.
/// The callee must set this value when \c ShouldExpand is \c true; it may
/// set this value in other cases.
///
/// \returns true if an error occurred (e.g., because the parameter packs
/// are to be instantiated with arguments of different lengths), false
/// otherwise. If false, \c ShouldExpand (and possibly \c NumExpansions)
/// must be set.
bool CheckParameterPacksForExpansion(SourceLocation EllipsisLoc,
                                     SourceRange PatternRange,
                           ArrayRef<UnexpandedParameterPack> Unexpanded,
                           const MultiLevelTemplateArgumentList &TemplateArgs,
                                     bool &ShouldExpand,
                                     bool &RetainExpansion,
                                     Optional<unsigned> &NumExpansions);

/// Determine the number of arguments in the given pack expansion
/// type.
///
/// This routine assumes that the number of arguments in the expansion is
/// consistent across all of the unexpanded parameter packs in its pattern.
///
/// Returns an empty Optional if the type can't be expanded.
Optional<unsigned> getNumArgumentsInExpansion(QualType T,
    const MultiLevelTemplateArgumentList &TemplateArgs);

/// Determine whether the given declarator contains any unexpanded
/// parameter packs.
///
/// This routine is used by the parser to disambiguate function declarators
/// with an ellipsis prior to the ')', e.g.,
///
/// \code
///   void f(T...);
/// \endcode
///
/// To determine whether we have an (unnamed) function parameter pack or
/// a variadic function.
///
/// \returns true if the declarator contains any unexpanded parameter packs,
/// false otherwise.
bool containsUnexpandedParameterPacks(Declarator &D);

/// Returns the pattern of the pack expansion for a template argument.
///
/// \param OrigLoc The template argument to expand.
///
/// \param Ellipsis Will be set to the location of the ellipsis.
///
/// \param NumExpansions Will be set to the number of expansions that will
/// be generated from this pack expansion, if known a priori.
TemplateArgumentLoc getTemplateArgumentPackExpansionPattern(
    TemplateArgumentLoc OrigLoc,
    SourceLocation &Ellipsis,
    Optional<unsigned> &NumExpansions) const;

/// Given a template argument that contains an unexpanded parameter pack, but
/// which has already been substituted, attempt to determine the number of
/// elements that will be produced once this argument is fully-expanded.
///
/// This is intended for use when transforming 'sizeof...(Arg)' in order to
/// avoid actually expanding the pack where possible.
Optional<unsigned> getFullyPackExpandedSize(TemplateArgument Arg);

//===--------------------------------------------------------------------===//
// C++ Template Argument Deduction (C++ [temp.deduct])
//===--------------------------------------------------------------------===//

/// Adjust the type \p ArgFunctionType to match the calling convention,
/// noreturn, and optionally the exception specification of \p FunctionType.
/// Deduction often wants to ignore these properties when matching function
/// types.
QualType adjustCCAndNoReturn(QualType ArgFunctionType, QualType FunctionType,
                             bool AdjustExceptionSpec = false);

/// Describes the result of template argument deduction.
///
/// The TemplateDeductionResult enumeration describes the result of
/// template argument deduction, as returned from
/// DeduceTemplateArguments(). The separate TemplateDeductionInfo
/// structure provides additional information about the results of
/// template argument deduction, e.g., the deduced template argument
/// list (if successful) or the specific template parameters or
/// deduced arguments that were involved in the failure.
enum TemplateDeductionResult {
  /// Template argument deduction was successful.
  TDK_Success = 0,
  /// The declaration was invalid; do nothing.
  TDK_Invalid,
  /// Template argument deduction exceeded the maximum template
  /// instantiation depth (which has already been diagnosed).
  TDK_InstantiationDepth,
  /// Template argument deduction did not deduce a value
  /// for every template parameter.
  TDK_Incomplete,
  /// Template argument deduction did not deduce a value for every
  /// expansion of an expanded template parameter pack.
  TDK_IncompletePack,
  /// Template argument deduction produced inconsistent
  /// deduced values for the given template parameter.
  TDK_Inconsistent,
  /// Template argument deduction failed due to inconsistent
  /// cv-qualifiers on a template parameter type that would
  /// otherwise be deduced, e.g., we tried to deduce T in "const T"
  /// but were given a non-const "X".
  TDK_Underqualified,
  /// Substitution of the deduced template argument values
  /// resulted in an error.
  TDK_SubstitutionFailure,
  /// After substituting deduced template arguments, a dependent
  /// parameter type did not match the corresponding argument.
  TDK_DeducedMismatch,
  /// After substituting deduced template arguments, an element of
  /// a dependent parameter type did not match the corresponding element
  /// of the corresponding argument (when deducing from an initializer list).
  TDK_DeducedMismatchNested,
  /// A non-depnedent component of the parameter did not match the
  /// corresponding component of the argument.
  TDK_NonDeducedMismatch,
  /// When performing template argument deduction for a function
  /// template, there were too many call arguments.
  TDK_TooManyArguments,
  /// When performing template argument deduction for a function
  /// template, there were too few call arguments.
  TDK_TooFewArguments,
  /// The explicitly-specified template arguments were not valid
  /// template arguments for the given template.
  TDK_InvalidExplicitArguments,
  /// Checking non-dependent argument conversions failed.
  TDK_NonDependentConversionFailure,
  /// Deduction failed; that's all we know.
  TDK_MiscellaneousDeductionFailure,
  /// CUDA Target attributes do not match.
  TDK_CUDATargetMismatch
};

TemplateDeductionResult
DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial,
                        const TemplateArgumentList &TemplateArgs,
                        sema::TemplateDeductionInfo &Info);

TemplateDeductionResult
DeduceTemplateArguments(VarTemplatePartialSpecializationDecl *Partial,
                        const TemplateArgumentList &TemplateArgs,
                        sema::TemplateDeductionInfo &Info);

TemplateDeductionResult SubstituteExplicitTemplateArguments(
    FunctionTemplateDecl *FunctionTemplate,
    TemplateArgumentListInfo &ExplicitTemplateArgs,
    SmallVectorImpl<DeducedTemplateArgument> &Deduced,
    SmallVectorImpl<QualType> &ParamTypes, QualType *FunctionType,
    sema::TemplateDeductionInfo &Info);

/// brief A function argument from which we performed template argument
// deduction for a call.
struct OriginalCallArg {
  OriginalCallArg(QualType OriginalParamType, bool DecomposedParam,
                  unsigned ArgIdx, QualType OriginalArgType)
      : OriginalParamType(OriginalParamType),
        DecomposedParam(DecomposedParam), ArgIdx(ArgIdx),
        OriginalArgType(OriginalArgType) {}

  QualType OriginalParamType;
  bool DecomposedParam;
  unsigned ArgIdx;
  QualType OriginalArgType;
};

TemplateDeductionResult FinishTemplateArgumentDeduction(
    FunctionTemplateDecl *FunctionTemplate,
    SmallVectorImpl<DeducedTemplateArgument> &Deduced,
    unsigned NumExplicitlySpecified, FunctionDecl *&Specialization,
    sema::TemplateDeductionInfo &Info,
    SmallVectorImpl<OriginalCallArg> const *OriginalCallArgs = nullptr,
    bool PartialOverloading = false,
    llvm::function_ref<bool()> CheckNonDependent = []{ return false; });

TemplateDeductionResult DeduceTemplateArguments(
    FunctionTemplateDecl *FunctionTemplate,
    TemplateArgumentListInfo *ExplicitTemplateArgs, ArrayRef<Expr *> Args,
    FunctionDecl *&Specialization, sema::TemplateDeductionInfo &Info,
    bool PartialOverloading,
    llvm::function_ref<bool(ArrayRef<QualType>)> CheckNonDependent);

TemplateDeductionResult
DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
                        TemplateArgumentListInfo *ExplicitTemplateArgs,
                        QualType ArgFunctionType,
                        FunctionDecl *&Specialization,
                        sema::TemplateDeductionInfo &Info,
                        bool IsAddressOfFunction = false);

TemplateDeductionResult
DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
                        QualType ToType,
                        CXXConversionDecl *&Specialization,
                        sema::TemplateDeductionInfo &Info);

TemplateDeductionResult
DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
                        TemplateArgumentListInfo *ExplicitTemplateArgs,
                        FunctionDecl *&Specialization,
                        sema::TemplateDeductionInfo &Info,
                        bool IsAddressOfFunction = false);

/// Substitute Replacement for \p auto in \p TypeWithAuto
QualType SubstAutoType(QualType TypeWithAuto, QualType Replacement);
/// Substitute Replacement for auto in TypeWithAuto
TypeSourceInfo* SubstAutoTypeSourceInfo(TypeSourceInfo *TypeWithAuto,
                                        QualType Replacement);
/// Completely replace the \c auto in \p TypeWithAuto by
/// \p Replacement. This does not retain any \c auto type sugar.
QualType ReplaceAutoType(QualType TypeWithAuto, QualType Replacement);

/// Result type of DeduceAutoType.
enum DeduceAutoResult {
  DAR_Succeeded,
  DAR_Failed,
  DAR_FailedAlreadyDiagnosed
};

DeduceAutoResult
DeduceAutoType(TypeSourceInfo *AutoType, Expr *&Initializer, QualType &Result,
               Optional<unsigned> DependentDeductionDepth = None);
DeduceAutoResult
DeduceAutoType(TypeLoc AutoTypeLoc, Expr *&Initializer, QualType &Result,
               Optional<unsigned> DependentDeductionDepth = None);
void DiagnoseAutoDeductionFailure(VarDecl *VDecl, Expr *Init);
bool DeduceReturnType(FunctionDecl *FD, SourceLocation Loc,
                      bool Diagnose = true);

/// Declare implicit deduction guides for a class template if we've
/// not already done so.
void DeclareImplicitDeductionGuides(TemplateDecl *Template,
                                    SourceLocation Loc);

QualType DeduceTemplateSpecializationFromInitializer(
    TypeSourceInfo *TInfo, const InitializedEntity &Entity,
    const InitializationKind &Kind, MultiExprArg Init);

QualType deduceVarTypeFromInitializer(VarDecl *VDecl, DeclarationName Name,
                                      QualType Type, TypeSourceInfo *TSI,
                                      SourceRange Range, bool DirectInit,
                                      Expr *Init);

TypeLoc getReturnTypeLoc(FunctionDecl *FD) const;

bool DeduceFunctionTypeFromReturnExpr(FunctionDecl *FD,
                                      SourceLocation ReturnLoc,
                                      Expr *&RetExpr, AutoType *AT);

FunctionTemplateDecl *getMoreSpecializedTemplate(FunctionTemplateDecl *FT1,
                                                 FunctionTemplateDecl *FT2,
                                                 SourceLocation Loc,
                                         TemplatePartialOrderingContext TPOC,
                                                 unsigned NumCallArguments1,
                                                 unsigned NumCallArguments2);
UnresolvedSetIterator
getMostSpecialized(UnresolvedSetIterator SBegin, UnresolvedSetIterator SEnd,
                   TemplateSpecCandidateSet &FailedCandidates,
                   SourceLocation Loc,
                   const PartialDiagnostic &NoneDiag,
                   const PartialDiagnostic &AmbigDiag,
                   const PartialDiagnostic &CandidateDiag,
                   bool Complain = true, QualType TargetType = QualType());

ClassTemplatePartialSpecializationDecl *
getMoreSpecializedPartialSpecialization(
                                ClassTemplatePartialSpecializationDecl *PS1,
                                ClassTemplatePartialSpecializationDecl *PS2,
                                SourceLocation Loc);

bool isMoreSpecializedThanPrimary(ClassTemplatePartialSpecializationDecl *T,
                                  sema::TemplateDeductionInfo &Info);

VarTemplatePartialSpecializationDecl *getMoreSpecializedPartialSpecialization(
    VarTemplatePartialSpecializationDecl *PS1,
    VarTemplatePartialSpecializationDecl *PS2, SourceLocation Loc);

bool isMoreSpecializedThanPrimary(VarTemplatePartialSpecializationDecl *T,
                                  sema::TemplateDeductionInfo &Info);

bool isTemplateTemplateParameterAtLeastAsSpecializedAs(
    TemplateParameterList *P, TemplateDecl *AArg, SourceLocation Loc);

void MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs,
                                bool OnlyDeduced,
                                unsigned Depth,
                                llvm::SmallBitVector &Used);
void MarkDeducedTemplateParameters(
                                const FunctionTemplateDecl *FunctionTemplate,
                                llvm::SmallBitVector &Deduced) {
  return MarkDeducedTemplateParameters(Context, FunctionTemplate, Deduced);
}
static void MarkDeducedTemplateParameters(ASTContext &Ctx,
                                const FunctionTemplateDecl *FunctionTemplate,
                                llvm::SmallBitVector &Deduced);

//===--------------------------------------------------------------------===//
// C++ Template Instantiation
//

MultiLevelTemplateArgumentList
getTemplateInstantiationArgs(NamedDecl *D,
                             const TemplateArgumentList *Innermost = nullptr,
                             bool RelativeToPrimary = false,
                             const FunctionDecl *Pattern = nullptr);

/// A context in which code is being synthesized (where a source location
/// alone is not sufficient to identify the context). This covers template
/// instantiation and various forms of implicitly-generated functions.
struct CodeSynthesisContext {
  /// The kind of template instantiation we are performing
  enum SynthesisKind {
    /// We are instantiating a template declaration. The entity is
    /// the declaration we're instantiating (e.g., a CXXRecordDecl).
    TemplateInstantiation,

    /// We are instantiating a default argument for a template
    /// parameter. The Entity is the template parameter whose argument is
    /// being instantiated, the Template is the template, and the
    /// TemplateArgs/NumTemplateArguments provide the template arguments as
    /// specified.
    DefaultTemplateArgumentInstantiation,

    /// We are instantiating a default argument for a function.
    /// The Entity is the ParmVarDecl, and TemplateArgs/NumTemplateArgs
    /// provides the template arguments as specified.
    DefaultFunctionArgumentInstantiation,

    /// We are substituting explicit template arguments provided for
    /// a function template. The entity is a FunctionTemplateDecl.
    ExplicitTemplateArgumentSubstitution,

    /// We are substituting template argument determined as part of
    /// template argument deduction for either a class template
    /// partial specialization or a function template. The
    /// Entity is either a {Class|Var}TemplatePartialSpecializationDecl or
    /// a TemplateDecl.
    DeducedTemplateArgumentSubstitution,

    /// We are substituting prior template arguments into a new
    /// template parameter. The template parameter itself is either a
    /// NonTypeTemplateParmDecl or a TemplateTemplateParmDecl.
    PriorTemplateArgumentSubstitution,

    /// We are checking the validity of a default template argument that
    /// has been used when naming a template-id.
    DefaultTemplateArgumentChecking,

    /// We are computing the exception specification for a defaulted special
    /// member function.
    ExceptionSpecEvaluation,

    /// We are instantiating the exception specification for a function
    /// template which was deferred until it was needed.
    ExceptionSpecInstantiation,

    /// We are declaring an implicit special member function.
    DeclaringSpecialMember,

    /// We are defining a synthesized function (such as a defaulted special
    /// member).
    DefiningSynthesizedFunction,

    /// Added for Template instantiation observation.
    /// Memoization means we are _not_ instantiating a template because
    /// it is already instantiated (but we entered a context where we
    /// would have had to if it was not already instantiated).
    Memoization
  } Kind;

  /// Was the enclosing context a non-instantiation SFINAE context?
  bool SavedInNonInstantiationSFINAEContext;

  /// The point of instantiation or synthesis within the source code.
  SourceLocation PointOfInstantiation;

  /// The entity that is being synthesized.
  Decl *Entity;

  /// The template (or partial specialization) in which we are
  /// performing the instantiation, for substitutions of prior template
  /// arguments.
  NamedDecl *Template;

  /// The list of template arguments we are substituting, if they
  /// are not part of the entity.
  const TemplateArgument *TemplateArgs;

  // FIXME: Wrap this union around more members, or perhaps store the
  // kind-specific members in the RAII object owning the context.
  union {
    /// The number of template arguments in TemplateArgs.
    unsigned NumTemplateArgs;

    /// The special member being declared or defined.
    CXXSpecialMember SpecialMember;
  };

  ArrayRef<TemplateArgument> template_arguments() const {
    assert(Kind != DeclaringSpecialMember)((Kind != DeclaringSpecialMember) ? static_cast<void> (
0) : __assert_fail ("Kind != DeclaringSpecialMember", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7408, __PRETTY_FUNCTION__));
    return {TemplateArgs, NumTemplateArgs};
  }

  /// The template deduction info object associated with the
  /// substitution or checking of explicit or deduced template arguments.
  sema::TemplateDeductionInfo *DeductionInfo;

  /// The source range that covers the construct that cause
  /// the instantiation, e.g., the template-id that causes a class
  /// template instantiation.
  SourceRange InstantiationRange;

  CodeSynthesisContext()
    : Kind(TemplateInstantiation), Entity(nullptr), Template(nullptr),
      TemplateArgs(nullptr), NumTemplateArgs(0), DeductionInfo(nullptr) {}

  /// Determines whether this template is an actual instantiation
  /// that should be counted toward the maximum instantiation depth.
  bool isInstantiationRecord() const;
};

/// List of active code synthesis contexts.
///
/// This vector is treated as a stack. As synthesis of one entity requires
/// synthesis of another, additional contexts are pushed onto the stack.
SmallVector<CodeSynthesisContext, 16> CodeSynthesisContexts;

/// Specializations whose definitions are currently being instantiated.
llvm::DenseSet<std::pair<Decl *, unsigned>> InstantiatingSpecializations;

/// Non-dependent types used in templates that have already been instantiated
/// by some template instantiation.
llvm::DenseSet<QualType> InstantiatedNonDependentTypes;

/// Extra modules inspected when performing a lookup during a template
/// instantiation. Computed lazily.
SmallVector<Module*, 16> CodeSynthesisContextLookupModules;

/// Cache of additional modules that should be used for name lookup
/// within the current template instantiation. Computed lazily; use
/// getLookupModules() to get a complete set.
llvm::DenseSet<Module*> LookupModulesCache;

/// Get the set of additional modules that should be checked during
/// name lookup. A module and its imports become visible when instanting a
/// template defined within it.
llvm::DenseSet<Module*> &getLookupModules();

/// Map from the most recent declaration of a namespace to the most
/// recent visible declaration of that namespace.
llvm::DenseMap<NamedDecl*, NamedDecl*> VisibleNamespaceCache;

/// Whether we are in a SFINAE context that is not associated with
/// template instantiation.
///
/// This is used when setting up a SFINAE trap (\c see SFINAETrap) outside
/// of a template instantiation or template argument deduction.
bool InNonInstantiationSFINAEContext;

/// The number of \p CodeSynthesisContexts that are not template
/// instantiations and, therefore, should not be counted as part of the
/// instantiation depth.
///
/// When the instantiation depth reaches the user-configurable limit
/// \p LangOptions::InstantiationDepth we will abort instantiation.
// FIXME: Should we have a similar limit for other forms of synthesis?
unsigned NonInstantiationEntries;

/// The depth of the context stack at the point when the most recent
/// error or warning was produced.
///
/// This value is used to suppress printing of redundant context stacks
/// when there are multiple errors or warnings in the same instantiation.
// FIXME: Does this belong in Sema? It's tough to implement it anywhere else.
unsigned LastEmittedCodeSynthesisContextDepth = 0;

/// The template instantiation callbacks to trace or track
/// instantiations (objects can be chained).
///
/// This callbacks is used to print, trace or track template
/// instantiations as they are being constructed.
std::vector<std::unique_ptr<TemplateInstantiationCallback>>
    TemplateInstCallbacks;

/// The current index into pack expansion arguments that will be
/// used for substitution of parameter packs.
///
/// The pack expansion index will be -1 to indicate that parameter packs
/// should be instantiated as themselves. Otherwise, the index specifies
/// which argument within the parameter pack will be used for substitution.
int ArgumentPackSubstitutionIndex;

/// RAII object used to change the argument pack substitution index
/// within a \c Sema object.
///
/// See \c ArgumentPackSubstitutionIndex for more information.
class ArgumentPackSubstitutionIndexRAII {
  Sema &Self;
  int OldSubstitutionIndex;

public:
  ArgumentPackSubstitutionIndexRAII(Sema &Self, int NewSubstitutionIndex)
    : Self(Self), OldSubstitutionIndex(Self.ArgumentPackSubstitutionIndex) {
    Self.ArgumentPackSubstitutionIndex = NewSubstitutionIndex;
  }

  ~ArgumentPackSubstitutionIndexRAII() {
    Self.ArgumentPackSubstitutionIndex = OldSubstitutionIndex;
  }
};

friend class ArgumentPackSubstitutionRAII;

/// For each declaration that involved template argument deduction, the
/// set of diagnostics that were suppressed during that template argument
/// deduction.
///
/// FIXME: Serialize this structure to the AST file.
typedef llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >
  SuppressedDiagnosticsMap;
SuppressedDiagnosticsMap SuppressedDiagnostics;

/// A stack object to be created when performing template
/// instantiation.
///
/// Construction of an object of type \c InstantiatingTemplate
/// pushes the current instantiation onto the stack of active
/// instantiations. If the size of this stack exceeds the maximum
/// number of recursive template instantiations, construction
/// produces an error and evaluates true.
///
/// Destruction of this object will pop the named instantiation off
/// the stack.
struct InstantiatingTemplate {
  /// Note that we are instantiating a class template,
  /// function template, variable template, alias template,
  /// or a member thereof.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        Decl *Entity,
                        SourceRange InstantiationRange = SourceRange());

  struct ExceptionSpecification {};
  /// Note that we are instantiating an exception specification
  /// of a function template.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        FunctionDecl *Entity, ExceptionSpecification,
                        SourceRange InstantiationRange = SourceRange());

  /// Note that we are instantiating a default argument in a
  /// template-id.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        TemplateParameter Param, TemplateDecl *Template,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange = SourceRange());

  /// Note that we are substituting either explicitly-specified or
  /// deduced template arguments during function template argument deduction.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        FunctionTemplateDecl *FunctionTemplate,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        CodeSynthesisContext::SynthesisKind Kind,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// Note that we are instantiating as part of template
  /// argument deduction for a class template declaration.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        TemplateDecl *Template,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// Note that we are instantiating as part of template
  /// argument deduction for a class template partial
  /// specialization.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        ClassTemplatePartialSpecializationDecl *PartialSpec,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// Note that we are instantiating as part of template
  /// argument deduction for a variable template partial
  /// specialization.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        VarTemplatePartialSpecializationDecl *PartialSpec,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// Note that we are instantiating a default argument for a function
  /// parameter.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        ParmVarDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange = SourceRange());

  /// Note that we are substituting prior template arguments into a
  /// non-type parameter.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        NamedDecl *Template,
                        NonTypeTemplateParmDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange);

  /// Note that we are substituting prior template arguments into a
  /// template template parameter.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        NamedDecl *Template,
                        TemplateTemplateParmDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange);

  /// Note that we are checking the default template argument
  /// against the template parameter for a given template-id.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        TemplateDecl *Template,
                        NamedDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange);


  /// Note that we have finished instantiating this template.
  void Clear();

  ~InstantiatingTemplate() { Clear(); }

  /// Determines whether we have exceeded the maximum
  /// recursive template instantiations.
  bool isInvalid() const { return Invalid; }

  /// Determine whether we are already instantiating this
  /// specialization in some surrounding active instantiation.
  bool isAlreadyInstantiating() const { return AlreadyInstantiating; }

private:
  Sema &SemaRef;
  bool Invalid;
  bool AlreadyInstantiating;
  bool CheckInstantiationDepth(SourceLocation PointOfInstantiation,
                               SourceRange InstantiationRange);

  InstantiatingTemplate(
      Sema &SemaRef, CodeSynthesisContext::SynthesisKind Kind,
      SourceLocation PointOfInstantiation, SourceRange InstantiationRange,
      Decl *Entity, NamedDecl *Template = nullptr,
      ArrayRef<TemplateArgument> TemplateArgs = None,
      sema::TemplateDeductionInfo *DeductionInfo = nullptr);

  InstantiatingTemplate(const InstantiatingTemplate&) = delete;

  InstantiatingTemplate&
  operator=(const InstantiatingTemplate&) = delete;
};

void pushCodeSynthesisContext(CodeSynthesisContext Ctx);
void popCodeSynthesisContext();

/// Determine whether we are currently performing template instantiation.
bool inTemplateInstantiation() const {
  return CodeSynthesisContexts.size() > NonInstantiationEntries;
}

void PrintContextStack() {
  if (!CodeSynthesisContexts.empty() &&
      CodeSynthesisContexts.size() != LastEmittedCodeSynthesisContextDepth) {
    PrintInstantiationStack();
    LastEmittedCodeSynthesisContextDepth = CodeSynthesisContexts.size();
  }
  if (PragmaAttributeCurrentTargetDecl)
    PrintPragmaAttributeInstantiationPoint();
}
void PrintInstantiationStack();

void PrintPragmaAttributeInstantiationPoint();

/// Determines whether we are currently in a context where
/// template argument substitution failures are not considered
/// errors.
///
/// \returns An empty \c Optional if we're not in a SFINAE context.
/// Otherwise, contains a pointer that, if non-NULL, contains the nearest
/// template-deduction context object, which can be used to capture
/// diagnostics that will be suppressed.
Optional<sema::TemplateDeductionInfo *> isSFINAEContext() const;

/// Determines whether we are currently in a context that
/// is not evaluated as per C++ [expr] p5.
bool isUnevaluatedContext() const {
  assert(!ExprEvalContexts.empty() &&((!ExprEvalContexts.empty() && "Must be in an expression evaluation context"
) ? static_cast<void> (0) : __assert_fail ("!ExprEvalContexts.empty() && \"Must be in an expression evaluation context\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7699, __PRETTY_FUNCTION__))
         "Must be in an expression evaluation context")((!ExprEvalContexts.empty() && "Must be in an expression evaluation context"
) ? static_cast<void> (0) : __assert_fail ("!ExprEvalContexts.empty() && \"Must be in an expression evaluation context\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7699, __PRETTY_FUNCTION__));
  return ExprEvalContexts.back().isUnevaluated();
}

/// RAII class used to determine whether SFINAE has
/// trapped any errors that occur during template argument
/// deduction.
class SFINAETrap {
  Sema &SemaRef;
  unsigned PrevSFINAEErrors;
  bool PrevInNonInstantiationSFINAEContext;
  bool PrevAccessCheckingSFINAE;
  bool PrevLastDiagnosticIgnored;

public:
  explicit SFINAETrap(Sema &SemaRef, bool AccessCheckingSFINAE = false)
    : SemaRef(SemaRef), PrevSFINAEErrors(SemaRef.NumSFINAEErrors),
      PrevInNonInstantiationSFINAEContext(
                                    SemaRef.InNonInstantiationSFINAEContext),
      PrevAccessCheckingSFINAE(SemaRef.AccessCheckingSFINAE),
      PrevLastDiagnosticIgnored(
          SemaRef.getDiagnostics().isLastDiagnosticIgnored())
  {
    if (!SemaRef.isSFINAEContext())
      SemaRef.InNonInstantiationSFINAEContext = true;
    SemaRef.AccessCheckingSFINAE = AccessCheckingSFINAE;
  }

  ~SFINAETrap() {
    SemaRef.NumSFINAEErrors = PrevSFINAEErrors;
    SemaRef.InNonInstantiationSFINAEContext
      = PrevInNonInstantiationSFINAEContext;
    SemaRef.AccessCheckingSFINAE = PrevAccessCheckingSFINAE;
    SemaRef.getDiagnostics().setLastDiagnosticIgnored(
        PrevLastDiagnosticIgnored);
  }

  /// Determine whether any SFINAE errors have been trapped.
  bool hasErrorOccurred() const {
    return SemaRef.NumSFINAEErrors > PrevSFINAEErrors;
  }
};

/// RAII class used to indicate that we are performing provisional
/// semantic analysis to determine the validity of a construct, so
/// typo-correction and diagnostics in the immediate context (not within
/// implicitly-instantiated templates) should be suppressed.
class TentativeAnalysisScope {
  Sema &SemaRef;
  // FIXME: Using a SFINAETrap for this is a hack.
  SFINAETrap Trap;
  bool PrevDisableTypoCorrection;
public:
  explicit TentativeAnalysisScope(Sema &SemaRef)
      : SemaRef(SemaRef), Trap(SemaRef, true),
        PrevDisableTypoCorrection(SemaRef.DisableTypoCorrection) {
    SemaRef.DisableTypoCorrection = true;
  }
  ~TentativeAnalysisScope() {
    SemaRef.DisableTypoCorrection = PrevDisableTypoCorrection;
  }
};

/// The current instantiation scope used to store local
/// variables.
LocalInstantiationScope *CurrentInstantiationScope;

/// Tracks whether we are in a context where typo correction is
/// disabled.
bool DisableTypoCorrection;

/// The number of typos corrected by CorrectTypo.
unsigned TyposCorrected;

typedef llvm::SmallSet<SourceLocation, 2> SrcLocSet;
typedef llvm::DenseMap<IdentifierInfo *, SrcLocSet> IdentifierSourceLocations;

/// A cache containing identifiers for which typo correction failed and
/// their locations, so that repeated attempts to correct an identifier in a
/// given location are ignored if typo correction already failed for it.
IdentifierSourceLocations TypoCorrectionFailures;

/// Worker object for performing CFG-based warnings.
sema::AnalysisBasedWarnings AnalysisWarnings;
threadSafety::BeforeSet *ThreadSafetyDeclCache;

/// An entity for which implicit template instantiation is required.
///
/// The source location associated with the declaration is the first place in
/// the source code where the declaration was "used". It is not necessarily
/// the point of instantiation (which will be either before or after the
/// namespace-scope declaration that triggered this implicit instantiation),
/// However, it is the location that diagnostics should generally refer to,
/// because users will need to know what code triggered the instantiation.
typedef std::pair<ValueDecl *, SourceLocation> PendingImplicitInstantiation;

/// The queue of implicit template instantiations that are required
/// but have not yet been performed.
std::deque<PendingImplicitInstantiation> PendingInstantiations;

/// Queue of implicit template instantiations that cannot be performed
/// eagerly.
SmallVector<PendingImplicitInstantiation, 1> LateParsedInstantiations;

class GlobalEagerInstantiationScope {
public:
  GlobalEagerInstantiationScope(Sema &S, bool Enabled)
      : S(S), Enabled(Enabled) {
    if (!Enabled) return;

    SavedPendingInstantiations.swap(S.PendingInstantiations);
    SavedVTableUses.swap(S.VTableUses);
  }

  void perform() {
    if (Enabled) {
      S.DefineUsedVTables();
      S.PerformPendingInstantiations();
    }
  }

  ~GlobalEagerInstantiationScope() {
    if (!Enabled) return;

    // Restore the set of pending vtables.
    assert(S.VTableUses.empty() &&((S.VTableUses.empty() && "VTableUses should be empty before it is discarded."
) ? static_cast<void> (0) : __assert_fail ("S.VTableUses.empty() && \"VTableUses should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7825, __PRETTY_FUNCTION__))
           "VTableUses should be empty before it is discarded.")((S.VTableUses.empty() && "VTableUses should be empty before it is discarded."
) ? static_cast<void> (0) : __assert_fail ("S.VTableUses.empty() && \"VTableUses should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7825, __PRETTY_FUNCTION__));
    S.VTableUses.swap(SavedVTableUses);

    // Restore the set of pending implicit instantiations.
    assert(S.PendingInstantiations.empty() &&((S.PendingInstantiations.empty() && "PendingInstantiations should be empty before it is discarded."
) ? static_cast<void> (0) : __assert_fail ("S.PendingInstantiations.empty() && \"PendingInstantiations should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7830, __PRETTY_FUNCTION__))
           "PendingInstantiations should be empty before it is discarded.")((S.PendingInstantiations.empty() && "PendingInstantiations should be empty before it is discarded."
) ? static_cast<void> (0) : __assert_fail ("S.PendingInstantiations.empty() && \"PendingInstantiations should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7830, __PRETTY_FUNCTION__));
    S.PendingInstantiations.swap(SavedPendingInstantiations);
  }

private:
  Sema &S;
  SmallVector<VTableUse, 16> SavedVTableUses;
  std::deque<PendingImplicitInstantiation> SavedPendingInstantiations;
  bool Enabled;
};

/// The queue of implicit template instantiations that are required
/// and must be performed within the current local scope.
///
/// This queue is only used for member functions of local classes in
/// templates, which must be instantiated in the same scope as their
/// enclosing function, so that they can reference function-local
/// types, static variables, enumerators, etc.
std::deque<PendingImplicitInstantiation> PendingLocalImplicitInstantiations;

class LocalEagerInstantiationScope {
public:
  LocalEagerInstantiationScope(Sema &S) : S(S) {
    SavedPendingLocalImplicitInstantiations.swap(
        S.PendingLocalImplicitInstantiations);
  }

  void perform() { S.PerformPendingInstantiations(/*LocalOnly=*/true); }

  ~LocalEagerInstantiationScope() {
    assert(S.PendingLocalImplicitInstantiations.empty() &&((S.PendingLocalImplicitInstantiations.empty() && "there shouldn't be any pending local implicit instantiations"
) ? static_cast<void> (0) : __assert_fail ("S.PendingLocalImplicitInstantiations.empty() && \"there shouldn't be any pending local implicit instantiations\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7861, __PRETTY_FUNCTION__))
           "there shouldn't be any pending local implicit instantiations")((S.PendingLocalImplicitInstantiations.empty() && "there shouldn't be any pending local implicit instantiations"
) ? static_cast<void> (0) : __assert_fail ("S.PendingLocalImplicitInstantiations.empty() && \"there shouldn't be any pending local implicit instantiations\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7861, __PRETTY_FUNCTION__));
    SavedPendingLocalImplicitInstantiations.swap(
        S.PendingLocalImplicitInstantiations);
  }

private:
  Sema &S;
  std::deque<PendingImplicitInstantiation>
      SavedPendingLocalImplicitInstantiations;
};

/// A helper class for building up ExtParameterInfos.
class ExtParameterInfoBuilder {
  SmallVector<FunctionProtoType::ExtParameterInfo, 16> Infos;
  bool HasInteresting = false;

public:
  /// Set the ExtParameterInfo for the parameter at the given index,
  ///
  void set(unsigned index, FunctionProtoType::ExtParameterInfo info) {
    assert(Infos.size() <= index)((Infos.size() <= index) ? static_cast<void> (0) : __assert_fail
 ("Infos.size() <= index", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 7881, __PRETTY_FUNCTION__));
    Infos.resize(index);
    Infos.push_back(info);

    if (!HasInteresting)
      HasInteresting = (info != FunctionProtoType::ExtParameterInfo());
  }

  /// Return a pointer (suitable for setting in an ExtProtoInfo) to the
  /// ExtParameterInfo array we've built up.
  const FunctionProtoType::ExtParameterInfo *
  getPointerOrNull(unsigned numParams) {
    if (!HasInteresting) return nullptr;
    Infos.resize(numParams);
    return Infos.data();
  }
};

void PerformPendingInstantiations(bool LocalOnly = false);

TypeSourceInfo *SubstType(TypeSourceInfo *T,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                          SourceLocation Loc, DeclarationName Entity,
                          bool AllowDeducedTST = false);

QualType SubstType(QualType T,
                   const MultiLevelTemplateArgumentList &TemplateArgs,
                   SourceLocation Loc, DeclarationName Entity);

TypeSourceInfo *SubstType(TypeLoc TL,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                          SourceLocation Loc, DeclarationName Entity);

TypeSourceInfo *SubstFunctionDeclType(TypeSourceInfo *T,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                                      SourceLocation Loc,
                                      DeclarationName Entity,
                                      CXXRecordDecl *ThisContext,
                                      Qualifiers ThisTypeQuals);
void SubstExceptionSpec(FunctionDecl *New, const FunctionProtoType *Proto,
                        const MultiLevelTemplateArgumentList &Args);
bool SubstExceptionSpec(SourceLocation Loc,
                        FunctionProtoType::ExceptionSpecInfo &ESI,
                        SmallVectorImpl<QualType> &ExceptionStorage,
                        const MultiLevelTemplateArgumentList &Args);
ParmVarDecl *SubstParmVarDecl(ParmVarDecl *D,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                              int indexAdjustment,
                              Optional<unsigned> NumExpansions,
                              bool ExpectParameterPack);
bool SubstParmTypes(SourceLocation Loc, ArrayRef<ParmVarDecl *> Params,
                    const FunctionProtoType::ExtParameterInfo *ExtParamInfos,
                    const MultiLevelTemplateArgumentList &TemplateArgs,
                    SmallVectorImpl<QualType> &ParamTypes,
                    SmallVectorImpl<ParmVarDecl *> *OutParams,
                    ExtParameterInfoBuilder &ParamInfos);
ExprResult SubstExpr(Expr *E,
                     const MultiLevelTemplateArgumentList &TemplateArgs);

/// Substitute the given template arguments into a list of
/// expressions, expanding pack expansions if required.
///
/// \param Exprs The list of expressions to substitute into.
///
/// \param IsCall Whether this is some form of call, in which case
/// default arguments will be dropped.
///
/// \param TemplateArgs The set of template arguments to substitute.
///
/// \param Outputs Will receive all of the substituted arguments.
///
/// \returns true if an error occurred, false otherwise.
bool SubstExprs(ArrayRef<Expr *> Exprs, bool IsCall,
                const MultiLevelTemplateArgumentList &TemplateArgs,
                SmallVectorImpl<Expr *> &Outputs);

StmtResult SubstStmt(Stmt *S,
                     const MultiLevelTemplateArgumentList &TemplateArgs);

TemplateParameterList *
SubstTemplateParams(TemplateParameterList *Params, DeclContext *Owner,
                    const MultiLevelTemplateArgumentList &TemplateArgs);

Decl *SubstDecl(Decl *D, DeclContext *Owner,
                const MultiLevelTemplateArgumentList &TemplateArgs);

ExprResult SubstInitializer(Expr *E,
                     const MultiLevelTemplateArgumentList &TemplateArgs,
                     bool CXXDirectInit);

bool
SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
                    CXXRecordDecl *Pattern,
                    const MultiLevelTemplateArgumentList &TemplateArgs);

bool
InstantiateClass(SourceLocation PointOfInstantiation,
                 CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern,
                 const MultiLevelTemplateArgumentList &TemplateArgs,
                 TemplateSpecializationKind TSK,
                 bool Complain = true);

bool InstantiateEnum(SourceLocation PointOfInstantiation,
                     EnumDecl *Instantiation, EnumDecl *Pattern,
                     const MultiLevelTemplateArgumentList &TemplateArgs,
                     TemplateSpecializationKind TSK);

bool InstantiateInClassInitializer(
    SourceLocation PointOfInstantiation, FieldDecl *Instantiation,
    FieldDecl *Pattern, const MultiLevelTemplateArgumentList &TemplateArgs);

struct LateInstantiatedAttribute {
  const Attr *TmplAttr;
  LocalInstantiationScope *Scope;
  Decl *NewDecl;

  LateInstantiatedAttribute(const Attr *A, LocalInstantiationScope *S,
                            Decl *D)
    : TmplAttr(A), Scope(S), NewDecl(D)
  { }
};
typedef SmallVector<LateInstantiatedAttribute, 16> LateInstantiatedAttrVec;

void InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
                      const Decl *Pattern, Decl *Inst,
                      LateInstantiatedAttrVec *LateAttrs = nullptr,
                      LocalInstantiationScope *OuterMostScope = nullptr);

void
InstantiateAttrsForDecl(const MultiLevelTemplateArgumentList &TemplateArgs,
                        const Decl *Pattern, Decl *Inst,
                        LateInstantiatedAttrVec *LateAttrs = nullptr,
                        LocalInstantiationScope *OuterMostScope = nullptr);

bool usesPartialOrExplicitSpecialization(
    SourceLocation Loc, ClassTemplateSpecializationDecl *ClassTemplateSpec);

bool
InstantiateClassTemplateSpecialization(SourceLocation PointOfInstantiation,
                         ClassTemplateSpecializationDecl *ClassTemplateSpec,
                         TemplateSpecializationKind TSK,
                         bool Complain = true);

void InstantiateClassMembers(SourceLocation PointOfInstantiation,
                             CXXRecordDecl *Instantiation,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                             TemplateSpecializationKind TSK);

void InstantiateClassTemplateSpecializationMembers(
                                        SourceLocation PointOfInstantiation,
                         ClassTemplateSpecializationDecl *ClassTemplateSpec,
                                              TemplateSpecializationKind TSK);

NestedNameSpecifierLoc
SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS,
                         const MultiLevelTemplateArgumentList &TemplateArgs);

DeclarationNameInfo
SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo,
                         const MultiLevelTemplateArgumentList &TemplateArgs);
TemplateName
SubstTemplateName(NestedNameSpecifierLoc QualifierLoc, TemplateName Name,
                  SourceLocation Loc,
                  const MultiLevelTemplateArgumentList &TemplateArgs);
bool Subst(const TemplateArgumentLoc *Args, unsigned NumArgs,
           TemplateArgumentListInfo &Result,
           const MultiLevelTemplateArgumentList &TemplateArgs);

void InstantiateExceptionSpec(SourceLocation PointOfInstantiation,
                              FunctionDecl *Function);
FunctionDecl *InstantiateFunctionDeclaration(FunctionTemplateDecl *FTD,
                                             const TemplateArgumentList *Args,
                                             SourceLocation Loc);
void InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
                                   FunctionDecl *Function,
                                   bool Recursive = false,
                                   bool DefinitionRequired = false,
                                   bool AtEndOfTU = false);
VarTemplateSpecializationDecl *BuildVarTemplateInstantiation(
    VarTemplateDecl *VarTemplate, VarDecl *FromVar,
    const TemplateArgumentList &TemplateArgList,
    const TemplateArgumentListInfo &TemplateArgsInfo,
    SmallVectorImpl<TemplateArgument> &Converted,
    SourceLocation PointOfInstantiation, void *InsertPos,
    LateInstantiatedAttrVec *LateAttrs = nullptr,
    LocalInstantiationScope *StartingScope = nullptr);
VarTemplateSpecializationDecl *CompleteVarTemplateSpecializationDecl(
    VarTemplateSpecializationDecl *VarSpec, VarDecl *PatternDecl,
    const MultiLevelTemplateArgumentList &TemplateArgs);
void
BuildVariableInstantiation(VarDecl *NewVar, VarDecl *OldVar,
                           const MultiLevelTemplateArgumentList &TemplateArgs,
                           LateInstantiatedAttrVec *LateAttrs,
                           DeclContext *Owner,
                           LocalInstantiationScope *StartingScope,
                           bool InstantiatingVarTemplate = false,
                           VarTemplateSpecializationDecl *PrevVTSD = nullptr);
void InstantiateVariableInitializer(
    VarDecl *Var, VarDecl *OldVar,
    const MultiLevelTemplateArgumentList &TemplateArgs);
void InstantiateVariableDefinition(SourceLocation PointOfInstantiation,
                                   VarDecl *Var, bool Recursive = false,
                                   bool DefinitionRequired = false,
                                   bool AtEndOfTU = false);

void InstantiateMemInitializers(CXXConstructorDecl *New,
                                const CXXConstructorDecl *Tmpl,
                          const MultiLevelTemplateArgumentList &TemplateArgs);

NamedDecl *FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
                        const MultiLevelTemplateArgumentList &TemplateArgs,
                        bool FindingInstantiatedContext = false);
DeclContext *FindInstantiatedContext(SourceLocation Loc, DeclContext *DC,
                        const MultiLevelTemplateArgumentList &TemplateArgs);

// Objective-C declarations.
enum ObjCContainerKind {
  OCK_None = -1,
  OCK_Interface = 0,
  OCK_Protocol,
  OCK_Category,
  OCK_ClassExtension,
  OCK_Implementation,
  OCK_CategoryImplementation
};
ObjCContainerKind getObjCContainerKind() const;

DeclResult actOnObjCTypeParam(Scope *S,
                              ObjCTypeParamVariance variance,
                              SourceLocation varianceLoc,
                              unsigned index,
                              IdentifierInfo *paramName,
                              SourceLocation paramLoc,
                              SourceLocation colonLoc,
                              ParsedType typeBound);

ObjCTypeParamList *actOnObjCTypeParamList(Scope *S, SourceLocation lAngleLoc,
                                          ArrayRef<Decl *> typeParams,
                                          SourceLocation rAngleLoc);
void popObjCTypeParamList(Scope *S, ObjCTypeParamList *typeParamList);

Decl *ActOnStartClassInterface(
    Scope *S, SourceLocation AtInterfaceLoc, IdentifierInfo *ClassName,
    SourceLocation ClassLoc, ObjCTypeParamList *typeParamList,
    IdentifierInfo *SuperName, SourceLocation SuperLoc,
    ArrayRef<ParsedType> SuperTypeArgs, SourceRange SuperTypeArgsRange,
    Decl *const *ProtoRefs, unsigned NumProtoRefs,
    const SourceLocation *ProtoLocs, SourceLocation EndProtoLoc,
    const ParsedAttributesView &AttrList);

void ActOnSuperClassOfClassInterface(Scope *S,
                                     SourceLocation AtInterfaceLoc,
                                     ObjCInterfaceDecl *IDecl,
                                     IdentifierInfo *ClassName,
                                     SourceLocation ClassLoc,
                                     IdentifierInfo *SuperName,
                                     SourceLocation SuperLoc,
                                     ArrayRef<ParsedType> SuperTypeArgs,
                                     SourceRange SuperTypeArgsRange);

void ActOnTypedefedProtocols(SmallVectorImpl<Decl *> &ProtocolRefs,
                             SmallVectorImpl<SourceLocation> &ProtocolLocs,
                             IdentifierInfo *SuperName,
                             SourceLocation SuperLoc);

Decl *ActOnCompatibilityAlias(
                  SourceLocation AtCompatibilityAliasLoc,
                  IdentifierInfo *AliasName,  SourceLocation AliasLocation,
                  IdentifierInfo *ClassName, SourceLocation ClassLocation);

bool CheckForwardProtocolDeclarationForCircularDependency(
  IdentifierInfo *PName,
  SourceLocation &PLoc, SourceLocation PrevLoc,
  const ObjCList<ObjCProtocolDecl> &PList);

Decl *ActOnStartProtocolInterface(
    SourceLocation AtProtoInterfaceLoc, IdentifierInfo *ProtocolName,
    SourceLocation ProtocolLoc, Decl *const *ProtoRefNames,
    unsigned NumProtoRefs, const SourceLocation *ProtoLocs,
    SourceLocation EndProtoLoc, const ParsedAttributesView &AttrList);

Decl *ActOnStartCategoryInterface(
    SourceLocation AtInterfaceLoc, IdentifierInfo *ClassName,
    SourceLocation ClassLoc, ObjCTypeParamList *typeParamList,
    IdentifierInfo *CategoryName, SourceLocation CategoryLoc,
    Decl *const *ProtoRefs, unsigned NumProtoRefs,
    const SourceLocation *ProtoLocs, SourceLocation EndProtoLoc,
    const ParsedAttributesView &AttrList);

Decl *ActOnStartClassImplementation(SourceLocation AtClassImplLoc,
                                    IdentifierInfo *ClassName,
                                    SourceLocation ClassLoc,
                                    IdentifierInfo *SuperClassname,
                                    SourceLocation SuperClassLoc,
                                    const ParsedAttributesView &AttrList);

Decl *ActOnStartCategoryImplementation(SourceLocation AtCatImplLoc,
                                       IdentifierInfo *ClassName,
                                       SourceLocation ClassLoc,
                                       IdentifierInfo *CatName,
                                       SourceLocation CatLoc,
                                       const ParsedAttributesView &AttrList);

DeclGroupPtrTy ActOnFinishObjCImplementation(Decl *ObjCImpDecl,
                                             ArrayRef<Decl *> Decls);

DeclGroupPtrTy ActOnForwardClassDeclaration(SourceLocation Loc,
                 IdentifierInfo **IdentList,
                 SourceLocation *IdentLocs,
                 ArrayRef<ObjCTypeParamList *> TypeParamLists,
                 unsigned NumElts);

DeclGroupPtrTy
ActOnForwardProtocolDeclaration(SourceLocation AtProtoclLoc,
                                ArrayRef<IdentifierLocPair> IdentList,
                                const ParsedAttributesView &attrList);

void FindProtocolDeclaration(bool WarnOnDeclarations, bool ForObjCContainer,
                             ArrayRef<IdentifierLocPair> ProtocolId,
                             SmallVectorImpl<Decl *> &Protocols);

void DiagnoseTypeArgsAndProtocols(IdentifierInfo *ProtocolId,
                                  SourceLocation ProtocolLoc,
                                  IdentifierInfo *TypeArgId,
                                  SourceLocation TypeArgLoc,
                                  bool SelectProtocolFirst = false);

/// Given a list of identifiers (and their locations), resolve the
/// names to either Objective-C protocol qualifiers or type
/// arguments, as appropriate.
void actOnObjCTypeArgsOrProtocolQualifiers(
       Scope *S,
       ParsedType baseType,
       SourceLocation lAngleLoc,
       ArrayRef<IdentifierInfo *> identifiers,
       ArrayRef<SourceLocation> identifierLocs,
       SourceLocation rAngleLoc,
       SourceLocation &typeArgsLAngleLoc,
       SmallVectorImpl<ParsedType> &typeArgs,
       SourceLocation &typeArgsRAngleLoc,
       SourceLocation &protocolLAngleLoc,
       SmallVectorImpl<Decl *> &protocols,
       SourceLocation &protocolRAngleLoc,
       bool warnOnIncompleteProtocols);

/// Build a an Objective-C protocol-qualified 'id' type where no
/// base type was specified.
TypeResult actOnObjCProtocolQualifierType(
             SourceLocation lAngleLoc,
             ArrayRef<Decl *> protocols,
             ArrayRef<SourceLocation> protocolLocs,
             SourceLocation rAngleLoc);

/// Build a specialized and/or protocol-qualified Objective-C type.
TypeResult actOnObjCTypeArgsAndProtocolQualifiers(
             Scope *S,
             SourceLocation Loc,
             ParsedType BaseType,
             SourceLocation TypeArgsLAngleLoc,
             ArrayRef<ParsedType> TypeArgs,
             SourceLocation TypeArgsRAngleLoc,
             SourceLocation ProtocolLAngleLoc,
             ArrayRef<Decl *> Protocols,
             ArrayRef<SourceLocation> ProtocolLocs,
             SourceLocation ProtocolRAngleLoc);

/// Build an Objective-C type parameter type.
QualType BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
                                SourceLocation ProtocolLAngleLoc,
                                ArrayRef<ObjCProtocolDecl *> Protocols,
                                ArrayRef<SourceLocation> ProtocolLocs,
                                SourceLocation ProtocolRAngleLoc,
                                bool FailOnError = false);

/// Build an Objective-C object pointer type.
QualType BuildObjCObjectType(QualType BaseType,
                             SourceLocation Loc,
                             SourceLocation TypeArgsLAngleLoc,
                             ArrayRef<TypeSourceInfo *> TypeArgs,
                             SourceLocation TypeArgsRAngleLoc,
                             SourceLocation ProtocolLAngleLoc,
                             ArrayRef<ObjCProtocolDecl *> Protocols,
                             ArrayRef<SourceLocation> ProtocolLocs,
                             SourceLocation ProtocolRAngleLoc,
                             bool FailOnError = false);

/// Ensure attributes are consistent with type.
/// \param [in, out] Attributes The attributes to check; they will
/// be modified to be consistent with \p PropertyTy.
void CheckObjCPropertyAttributes(Decl *PropertyPtrTy,
                                 SourceLocation Loc,
                                 unsigned &Attributes,
                                 bool propertyInPrimaryClass);

/// Process the specified property declaration and create decls for the
/// setters and getters as needed.
/// \param property The property declaration being processed
void ProcessPropertyDecl(ObjCPropertyDecl *property);


void DiagnosePropertyMismatch(ObjCPropertyDecl *Property,
                              ObjCPropertyDecl *SuperProperty,
                              const IdentifierInfo *Name,
                              bool OverridingProtocolProperty);

void DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT,
                                      ObjCInterfaceDecl *ID);

Decl *ActOnAtEnd(Scope *S, SourceRange AtEnd,
                 ArrayRef<Decl *> allMethods = None,
                 ArrayRef<DeclGroupPtrTy> allTUVars = None);

Decl *ActOnProperty(Scope *S, SourceLocation AtLoc,
                    SourceLocation LParenLoc,
                    FieldDeclarator &FD, ObjCDeclSpec &ODS,
                    Selector GetterSel, Selector SetterSel,
                    tok::ObjCKeywordKind MethodImplKind,
                    DeclContext *lexicalDC = nullptr);

Decl *ActOnPropertyImplDecl(Scope *S,
                            SourceLocation AtLoc,
                            SourceLocation PropertyLoc,
                            bool ImplKind,
                            IdentifierInfo *PropertyId,
                            IdentifierInfo *PropertyIvar,
                            SourceLocation PropertyIvarLoc,
                            ObjCPropertyQueryKind QueryKind);

enum ObjCSpecialMethodKind {
  OSMK_None,
  OSMK_Alloc,
  OSMK_New,
  OSMK_Copy,
  OSMK_RetainingInit,
  OSMK_NonRetainingInit
};

struct ObjCArgInfo {
  IdentifierInfo *Name;
  SourceLocation NameLoc;
  // The Type is null if no type was specified, and the DeclSpec is invalid
  // in this case.
  ParsedType Type;
  ObjCDeclSpec DeclSpec;

  /// ArgAttrs - Attribute list for this argument.
  ParsedAttributesView ArgAttrs;
};

Decl *ActOnMethodDeclaration(
    Scope *S,
    SourceLocation BeginLoc, // location of the + or -.
    SourceLocation EndLoc,   // location of the ; or {.
    tok::TokenKind MethodType, ObjCDeclSpec &ReturnQT, ParsedType ReturnType,
    ArrayRef<SourceLocation> SelectorLocs, Selector Sel,
    // optional arguments. The number of types/arguments is obtained
    // from the Sel.getNumArgs().
    ObjCArgInfo *ArgInfo, DeclaratorChunk::ParamInfo *CParamInfo,
    unsigned CNumArgs, // c-style args
    const ParsedAttributesView &AttrList, tok::ObjCKeywordKind MethodImplKind,
    bool isVariadic, bool MethodDefinition);

ObjCMethodDecl *LookupMethodInQualifiedType(Selector Sel,
                                            const ObjCObjectPointerType *OPT,
                                            bool IsInstance);
ObjCMethodDecl *LookupMethodInObjectType(Selector Sel, QualType Ty,
                                         bool IsInstance);

bool CheckARCMethodDecl(ObjCMethodDecl *method);
bool inferObjCARCLifetime(ValueDecl *decl);

ExprResult
HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
                          Expr *BaseExpr,
                          SourceLocation OpLoc,
                          DeclarationName MemberName,
                          SourceLocation MemberLoc,
                          SourceLocation SuperLoc, QualType SuperType,
                          bool Super);

ExprResult
ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
                          IdentifierInfo &propertyName,
                          SourceLocation receiverNameLoc,
                          SourceLocation propertyNameLoc);

ObjCMethodDecl *tryCaptureObjCSelf(SourceLocation Loc);

/// Describes the kind of message expression indicated by a message
/// send that starts with an identifier.
enum ObjCMessageKind {
  /// The message is sent to 'super'.
  ObjCSuperMessage,
  /// The message is an instance message.
  ObjCInstanceMessage,
  /// The message is a class message, and the identifier is a type
  /// name.
  ObjCClassMessage
};

ObjCMessageKind getObjCMessageKind(Scope *S,
                                   IdentifierInfo *Name,
                                   SourceLocation NameLoc,
                                   bool IsSuper,
                                   bool HasTrailingDot,
                                   ParsedType &ReceiverType);

ExprResult ActOnSuperMessage(Scope *S, SourceLocation SuperLoc,
                             Selector Sel,
                             SourceLocation LBracLoc,
                             ArrayRef<SourceLocation> SelectorLocs,
                             SourceLocation RBracLoc,
                             MultiExprArg Args);

ExprResult BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
                             QualType ReceiverType,
                             SourceLocation SuperLoc,
                             Selector Sel,
                             ObjCMethodDecl *Method,
                             SourceLocation LBracLoc,
                             ArrayRef<SourceLocation> SelectorLocs,
                             SourceLocation RBracLoc,
                             MultiExprArg Args,
                             bool isImplicit = false);

ExprResult BuildClassMessageImplicit(QualType ReceiverType,
                                     bool isSuperReceiver,
                                     SourceLocation Loc,
                                     Selector Sel,
                                     ObjCMethodDecl *Method,
                                     MultiExprArg Args);

ExprResult ActOnClassMessage(Scope *S,
                             ParsedType Receiver,
                             Selector Sel,
                             SourceLocation LBracLoc,
                             ArrayRef<SourceLocation> SelectorLocs,
                             SourceLocation RBracLoc,
                             MultiExprArg Args);

ExprResult BuildInstanceMessage(Expr *Receiver,
                                QualType ReceiverType,
                                SourceLocation SuperLoc,
                                Selector Sel,
                                ObjCMethodDecl *Method,
                                SourceLocation LBracLoc,
                                ArrayRef<SourceLocation> SelectorLocs,
                                SourceLocation RBracLoc,
                                MultiExprArg Args,
                                bool isImplicit = false);

ExprResult BuildInstanceMessageImplicit(Expr *Receiver,
                                        QualType ReceiverType,
                                        SourceLocation Loc,
                                        Selector Sel,
                                        ObjCMethodDecl *Method,
                                        MultiExprArg Args);

ExprResult ActOnInstanceMessage(Scope *S,
                                Expr *Receiver,
                                Selector Sel,
                                SourceLocation LBracLoc,
                                ArrayRef<SourceLocation> SelectorLocs,
                                SourceLocation RBracLoc,
                                MultiExprArg Args);

ExprResult BuildObjCBridgedCast(SourceLocation LParenLoc,
                                ObjCBridgeCastKind Kind,
                                SourceLocation BridgeKeywordLoc,
                                TypeSourceInfo *TSInfo,
                                Expr *SubExpr);

ExprResult ActOnObjCBridgedCast(Scope *S,
                                SourceLocation LParenLoc,
                                ObjCBridgeCastKind Kind,
                                SourceLocation BridgeKeywordLoc,
                                ParsedType Type,
                                SourceLocation RParenLoc,
                                Expr *SubExpr);

void CheckTollFreeBridgeCast(QualType castType, Expr *castExpr);

void CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr);

bool CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
                                   CastKind &Kind);

bool checkObjCBridgeRelatedComponents(SourceLocation Loc,
                                      QualType DestType, QualType SrcType,
                                      ObjCInterfaceDecl *&RelatedClass,
                                      ObjCMethodDecl *&ClassMethod,
                                      ObjCMethodDecl *&InstanceMethod,
                                      TypedefNameDecl *&TDNDecl,
                                      bool CfToNs, bool Diagnose = true);

bool CheckObjCBridgeRelatedConversions(SourceLocation Loc,
                                       QualType DestType, QualType SrcType,
                                       Expr *&SrcExpr, bool Diagnose = true);

bool ConversionToObjCStringLiteralCheck(QualType DstType, Expr *&SrcExpr,
                                        bool Diagnose = true);

bool checkInitMethod(ObjCMethodDecl *method, QualType receiverTypeIfCall);

/// Check whether the given new method is a valid override of the
/// given overridden method, and set any properties that should be inherited.
void CheckObjCMethodOverride(ObjCMethodDecl *NewMethod,
                             const ObjCMethodDecl *Overridden);

/// Describes the compatibility of a result type with its method.
enum ResultTypeCompatibilityKind {
  RTC_Compatible,
  RTC_Incompatible,
  RTC_Unknown
};

void CheckObjCMethodOverrides(ObjCMethodDecl *ObjCMethod,
                              ObjCInterfaceDecl *CurrentClass,
                              ResultTypeCompatibilityKind RTC);

enum PragmaOptionsAlignKind {
  POAK_Native,  // #pragma options align=native
  POAK_Natural, // #pragma options align=natural
  POAK_Packed,  // #pragma options align=packed
  POAK_Power,   // #pragma options align=power
  POAK_Mac68k,  // #pragma options align=mac68k
  POAK_Reset    // #pragma options align=reset
};

/// ActOnPragmaClangSection - Called on well formed \#pragma clang section
void ActOnPragmaClangSection(SourceLocation PragmaLoc,
                             PragmaClangSectionAction Action,
                             PragmaClangSectionKind SecKind, StringRef SecName);

/// ActOnPragmaOptionsAlign - Called on well formed \#pragma options align.
void ActOnPragmaOptionsAlign(PragmaOptionsAlignKind Kind,
                             SourceLocation PragmaLoc);

/// ActOnPragmaPack - Called on well formed \#pragma pack(...).
void ActOnPragmaPack(SourceLocation PragmaLoc, PragmaMsStackAction Action,
                     StringRef SlotLabel, Expr *Alignment);

enum class PragmaPackDiagnoseKind {
  NonDefaultStateAtInclude,
  ChangedStateAtExit
};

void DiagnoseNonDefaultPragmaPack(PragmaPackDiagnoseKind Kind,
                                  SourceLocation IncludeLoc);
void DiagnoseUnterminatedPragmaPack();

/// ActOnPragmaMSStruct - Called on well formed \#pragma ms_struct [on|off].
void ActOnPragmaMSStruct(PragmaMSStructKind Kind);

/// ActOnPragmaMSComment - Called on well formed
/// \#pragma comment(kind, "arg").
void ActOnPragmaMSComment(SourceLocation CommentLoc, PragmaMSCommentKind Kind,
                          StringRef Arg);

/// ActOnPragmaMSPointersToMembers - called on well formed \#pragma
/// pointers_to_members(representation method[, general purpose
/// representation]).
void ActOnPragmaMSPointersToMembers(
    LangOptions::PragmaMSPointersToMembersKind Kind,
    SourceLocation PragmaLoc);

/// Called on well formed \#pragma vtordisp().
void ActOnPragmaMSVtorDisp(PragmaMsStackAction Action,
                           SourceLocation PragmaLoc,
                           MSVtorDispAttr::Mode Value);

enum PragmaSectionKind {
  PSK_DataSeg,
  PSK_BSSSeg,
  PSK_ConstSeg,
  PSK_CodeSeg,
};

bool UnifySection(StringRef SectionName,
                  int SectionFlags,
                  DeclaratorDecl *TheDecl);
bool UnifySection(StringRef SectionName,
                  int SectionFlags,
                  SourceLocation PragmaSectionLocation);

/// Called on well formed \#pragma bss_seg/data_seg/const_seg/code_seg.
void ActOnPragmaMSSeg(SourceLocation PragmaLocation,
                      PragmaMsStackAction Action,
                      llvm::StringRef StackSlotLabel,
                      StringLiteral *SegmentName,
                      llvm::StringRef PragmaName);

/// Called on well formed \#pragma section().
void ActOnPragmaMSSection(SourceLocation PragmaLocation,
                          int SectionFlags, StringLiteral *SegmentName);

/// Called on well-formed \#pragma init_seg().
void ActOnPragmaMSInitSeg(SourceLocation PragmaLocation,
                          StringLiteral *SegmentName);

/// Called on #pragma clang __debug dump II
void ActOnPragmaDump(Scope *S, SourceLocation Loc, IdentifierInfo *II);

/// ActOnPragmaDetectMismatch - Call on well-formed \#pragma detect_mismatch
void ActOnPragmaDetectMismatch(SourceLocation Loc, StringRef Name,
                               StringRef Value);

/// ActOnPragmaUnused - Called on well-formed '\#pragma unused'.
void ActOnPragmaUnused(const Token &Identifier,
                       Scope *curScope,
                       SourceLocation PragmaLoc);

/// ActOnPragmaVisibility - Called on well formed \#pragma GCC visibility... .
void ActOnPragmaVisibility(const IdentifierInfo* VisType,
                           SourceLocation PragmaLoc);

NamedDecl *DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II,
                               SourceLocation Loc);
void DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W);

/// ActOnPragmaWeakID - Called on well formed \#pragma weak ident.
void ActOnPragmaWeakID(IdentifierInfo* WeakName,
                       SourceLocation PragmaLoc,
                       SourceLocation WeakNameLoc);

/// ActOnPragmaRedefineExtname - Called on well formed
/// \#pragma redefine_extname oldname newname.
void ActOnPragmaRedefineExtname(IdentifierInfo* WeakName,
                                IdentifierInfo* AliasName,
                                SourceLocation PragmaLoc,
                                SourceLocation WeakNameLoc,
                                SourceLocation AliasNameLoc);

/// ActOnPragmaWeakAlias - Called on well formed \#pragma weak ident = ident.
void ActOnPragmaWeakAlias(IdentifierInfo* WeakName,
                          IdentifierInfo* AliasName,
                          SourceLocation PragmaLoc,
                          SourceLocation WeakNameLoc,
                          SourceLocation AliasNameLoc);

/// ActOnPragmaFPContract - Called on well formed
/// \#pragma {STDC,OPENCL} FP_CONTRACT and
/// \#pragma clang fp contract
void ActOnPragmaFPContract(LangOptions::FPContractModeKind FPC);

/// ActOnPragmaFenvAccess - Called on well formed
/// \#pragma STDC FENV_ACCESS
void ActOnPragmaFEnvAccess(LangOptions::FEnvAccessModeKind FPC);

/// AddAlignmentAttributesForRecord - Adds any needed alignment attributes to
/// a the record decl, to handle '\#pragma pack' and '\#pragma options align'.
void AddAlignmentAttributesForRecord(RecordDecl *RD);

/// AddMsStructLayoutForRecord - Adds ms_struct layout attribute to record.
void AddMsStructLayoutForRecord(RecordDecl *RD);

/// FreePackedContext - Deallocate and null out PackContext.
void FreePackedContext();

/// PushNamespaceVisibilityAttr - Note that we've entered a
/// namespace with a visibility attribute.
void PushNamespaceVisibilityAttr(const VisibilityAttr *Attr,
                                 SourceLocation Loc);

/// AddPushedVisibilityAttribute - If '\#pragma GCC visibility' was used,
/// add an appropriate visibility attribute.
void AddPushedVisibilityAttribute(Decl *RD);

/// PopPragmaVisibility - Pop the top element of the visibility stack; used
/// for '\#pragma GCC visibility' and visibility attributes on namespaces.
void PopPragmaVisibility(bool IsNamespaceEnd, SourceLocation EndLoc);

/// FreeVisContext - Deallocate and null out VisContext.
void FreeVisContext();

/// AddCFAuditedAttribute - Check whether we're currently within
/// '\#pragma clang arc_cf_code_audited' and, if so, consider adding
/// the appropriate attribute.
void AddCFAuditedAttribute(Decl *D);

void ActOnPragmaAttributeAttribute(ParsedAttr &Attribute,
                                   SourceLocation PragmaLoc,
                                   attr::ParsedSubjectMatchRuleSet Rules);
void ActOnPragmaAttributeEmptyPush(SourceLocation PragmaLoc,
                                   const IdentifierInfo *Namespace);

/// Called on well-formed '\#pragma clang attribute pop'.
void ActOnPragmaAttributePop(SourceLocation PragmaLoc,
                             const IdentifierInfo *Namespace);

/// Adds the attributes that have been specified using the
/// '\#pragma clang attribute push' directives to the given declaration.
void AddPragmaAttributes(Scope *S, Decl *D);

void DiagnoseUnterminatedPragmaAttribute();

/// Called on well formed \#pragma clang optimize.
void ActOnPragmaOptimize(bool On, SourceLocation PragmaLoc);

/// Get the location for the currently active "\#pragma clang optimize
/// off". If this location is invalid, then the state of the pragma is "on".
SourceLocation getOptimizeOffPragmaLocation() const {
  return OptimizeOffPragmaLocation;
}

/// Only called on function definitions; if there is a pragma in scope
/// with the effect of a range-based optnone, consider marking the function
/// with attribute optnone.
void AddRangeBasedOptnone(FunctionDecl *FD);

/// Adds the 'optnone' attribute to the function declaration if there
/// are no conflicts; Loc represents the location causing the 'optnone'
/// attribute to be added (usually because of a pragma).
void AddOptnoneAttributeIfNoConflicts(FunctionDecl *FD, SourceLocation Loc);

/// AddAlignedAttr - Adds an aligned attribute to a particular declaration.
void AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
                    unsigned SpellingListIndex, bool IsPackExpansion);
void AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *T,
                    unsigned SpellingListIndex, bool IsPackExpansion);

/// AddAssumeAlignedAttr - Adds an assume_aligned attribute to a particular
/// declaration.
void AddAssumeAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E, Expr *OE,
                          unsigned SpellingListIndex);

/// AddAllocAlignAttr - Adds an alloc_align attribute to a particular
/// declaration.
void AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
                       unsigned SpellingListIndex);

/// AddAlignValueAttr - Adds an align_value attribute to a particular
/// declaration.
void AddAlignValueAttr(SourceRange AttrRange, Decl *D, Expr *E,
                       unsigned SpellingListIndex);

/// AddLaunchBoundsAttr - Adds a launch_bounds attribute to a particular
/// declaration.
void AddLaunchBoundsAttr(SourceRange AttrRange, Decl *D, Expr *MaxThreads,
                         Expr *MinBlocks, unsigned SpellingListIndex);

/// AddModeAttr - Adds a mode attribute to a particular declaration.
void AddModeAttr(SourceRange AttrRange, Decl *D, IdentifierInfo *Name,
                 unsigned SpellingListIndex, bool InInstantiation = false);

void AddParameterABIAttr(SourceRange AttrRange, Decl *D,
                         ParameterABI ABI, unsigned SpellingListIndex);

enum class RetainOwnershipKind {NS, CF, OS};
void AddXConsumedAttr(Decl *D, SourceRange SR, unsigned SpellingIndex,
                      RetainOwnershipKind K, bool IsTemplateInstantiation);

/// addAMDGPUFlatWorkGroupSizeAttr - Adds an amdgpu_flat_work_group_size
/// attribute to a particular declaration.
void addAMDGPUFlatWorkGroupSizeAttr(SourceRange AttrRange, Decl *D, Expr *Min,
                                    Expr *Max, unsigned SpellingListIndex);

/// addAMDGPUWavePersEUAttr - Adds an amdgpu_waves_per_eu attribute to a
/// particular declaration.
void addAMDGPUWavesPerEUAttr(SourceRange AttrRange, Decl *D, Expr *Min,
                             Expr *Max, unsigned SpellingListIndex);

bool checkNSReturnsRetainedReturnType(SourceLocation loc, QualType type);

//===--------------------------------------------------------------------===//
// C++ Coroutines TS
//
bool ActOnCoroutineBodyStart(Scope *S, SourceLocation KwLoc,
                             StringRef Keyword);
ExprResult ActOnCoawaitExpr(Scope *S, SourceLocation KwLoc, Expr *E);
ExprResult ActOnCoyieldExpr(Scope *S, SourceLocation KwLoc, Expr *E);
StmtResult ActOnCoreturnStmt(Scope *S, SourceLocation KwLoc, Expr *E);

ExprResult BuildResolvedCoawaitExpr(SourceLocation KwLoc, Expr *E,
                                    bool IsImplicit = false);
ExprResult BuildUnresolvedCoawaitExpr(SourceLocation KwLoc, Expr *E,
                                      UnresolvedLookupExpr* Lookup);
ExprResult BuildCoyieldExpr(SourceLocation KwLoc, Expr *E);
StmtResult BuildCoreturnStmt(SourceLocation KwLoc, Expr *E,
                             bool IsImplicit = false);
StmtResult BuildCoroutineBodyStmt(CoroutineBodyStmt::CtorArgs);
bool buildCoroutineParameterMoves(SourceLocation Loc);
VarDecl *buildCoroutinePromise(SourceLocation Loc);
void CheckCompletedCoroutineBody(FunctionDecl *FD, Stmt *&Body);
ClassTemplateDecl *lookupCoroutineTraits(SourceLocation KwLoc,
                                         SourceLocation FuncLoc);

//===--------------------------------------------------------------------===//
// OpenCL extensions.
//
8771private:
std::string CurrOpenCLExtension;
/// Extensions required by an OpenCL type.
llvm::DenseMap<const Type*, std::set<std::string>> OpenCLTypeExtMap;
/// Extensions required by an OpenCL declaration.
llvm::DenseMap<const Decl*, std::set<std::string>> OpenCLDeclExtMap;
8777public:
llvm::StringRef getCurrentOpenCLExtension() const {
  return CurrOpenCLExtension;
}

/// Check if a function declaration \p FD associates with any
/// extensions present in OpenCLDeclExtMap and if so return the
/// extension(s) name(s).
std::string getOpenCLExtensionsFromDeclExtMap(FunctionDecl *FD);

/// Check if a function type \p FT associates with any
/// extensions present in OpenCLTypeExtMap and if so return the
/// extension(s) name(s).
std::string getOpenCLExtensionsFromTypeExtMap(FunctionType *FT);

/// Find an extension in an appropriate extension map and return its name
template<typename T, typename MapT>
std::string getOpenCLExtensionsFromExtMap(T* FT, MapT &Map);

void setCurrentOpenCLExtension(llvm::StringRef Ext) {
  CurrOpenCLExtension = Ext;
}

/// Set OpenCL extensions for a type which can only be used when these
/// OpenCL extensions are enabled. If \p Exts is empty, do nothing.
/// \param Exts A space separated list of OpenCL extensions.
void setOpenCLExtensionForType(QualType T, llvm::StringRef Exts);

/// Set OpenCL extensions for a declaration which can only be
/// used when these OpenCL extensions are enabled. If \p Exts is empty, do
/// nothing.
/// \param Exts A space separated list of OpenCL extensions.
void setOpenCLExtensionForDecl(Decl *FD, llvm::StringRef Exts);

/// Set current OpenCL extensions for a type which can only be used
/// when these OpenCL extensions are enabled. If current OpenCL extension is
/// empty, do nothing.
void setCurrentOpenCLExtensionForType(QualType T);

/// Set current OpenCL extensions for a declaration which
/// can only be used when these OpenCL extensions are enabled. If current
/// OpenCL extension is empty, do nothing.
void setCurrentOpenCLExtensionForDecl(Decl *FD);

bool isOpenCLDisabledDecl(Decl *FD);

/// Check if type \p T corresponding to declaration specifier \p DS
/// is disabled due to required OpenCL extensions being disabled. If so,
/// emit diagnostics.
/// \return true if type is disabled.
bool checkOpenCLDisabledTypeDeclSpec(const DeclSpec &DS, QualType T);

/// Check if declaration \p D used by expression \p E
/// is disabled due to required OpenCL extensions being disabled. If so,
/// emit diagnostics.
/// \return true if type is disabled.
bool checkOpenCLDisabledDecl(const NamedDecl &D, const Expr &E);

//===--------------------------------------------------------------------===//
// OpenMP directives and clauses.
//
8838private:
void *VarDataSharingAttributesStack;
/// Number of nested '#pragma omp declare target' directives.
unsigned DeclareTargetNestingLevel = 0;
/// Initialization of data-sharing attributes stack.
void InitDataSharingAttributesStack();
void DestroyDataSharingAttributesStack();
ExprResult
VerifyPositiveIntegerConstantInClause(Expr *Op, OpenMPClauseKind CKind,
                                      bool StrictlyPositive = true);
/// Returns OpenMP nesting level for current directive.
unsigned getOpenMPNestingLevel() const;

/// Adjusts the function scopes index for the target-based regions.
void adjustOpenMPTargetScopeIndex(unsigned &FunctionScopesIndex,
                                  unsigned Level) const;

/// Push new OpenMP function region for non-capturing function.
void pushOpenMPFunctionRegion();

/// Pop OpenMP function region for non-capturing function.
void popOpenMPFunctionRegion(const sema::FunctionScopeInfo *OldFSI);

/// Check whether we're allowed to call Callee from the current function.
void checkOpenMPDeviceFunction(SourceLocation Loc, FunctionDecl *Callee);

/// Check if the expression is allowed to be used in expressions for the
/// OpenMP devices.
void checkOpenMPDeviceExpr(const Expr *E);

/// Checks if a type or a declaration is disabled due to the owning extension
/// being disabled, and emits diagnostic messages if it is disabled.
/// \param D type or declaration to be checked.
/// \param DiagLoc source location for the diagnostic message.
/// \param DiagInfo information to be emitted for the diagnostic message.
/// \param SrcRange source range of the declaration.
/// \param Map maps type or declaration to the extensions.
/// \param Selector selects diagnostic message: 0 for type and 1 for
///        declaration.
/// \return true if the type or declaration is disabled.
template <typename T, typename DiagLocT, typename DiagInfoT, typename MapT>
bool checkOpenCLDisabledTypeOrDecl(T D, DiagLocT DiagLoc, DiagInfoT DiagInfo,
                                   MapT &Map, unsigned Selector = 0,
                                   SourceRange SrcRange = SourceRange());

8883public:
/// Return true if the provided declaration \a VD should be captured by
/// reference.
/// \param Level Relative level of nested OpenMP construct for that the check
/// is performed.
bool isOpenMPCapturedByRef(const ValueDecl *D, unsigned Level) const;

/// Check if the specified variable is used in one of the private
/// clauses (private, firstprivate, lastprivate, reduction etc.) in OpenMP
/// constructs.
VarDecl *isOpenMPCapturedDecl(ValueDecl *D, bool CheckScopeInfo = false,
                              unsigned StopAt = 0);
ExprResult getOpenMPCapturedExpr(VarDecl *Capture, ExprValueKind VK,
                                 ExprObjectKind OK, SourceLocation Loc);

/// If the current region is a loop-based region, mark the start of the loop
/// construct.
void startOpenMPLoop();

/// Check if the specified variable is used in 'private' clause.
/// \param Level Relative level of nested OpenMP construct for that the check
/// is performed.
bool isOpenMPPrivateDecl(const ValueDecl *D, unsigned Level) const;

/// Sets OpenMP capture kind (OMPC_private, OMPC_firstprivate, OMPC_map etc.)
/// for \p FD based on DSA for the provided corresponding captured declaration
/// \p D.
void setOpenMPCaptureKind(FieldDecl *FD, const ValueDecl *D, unsigned Level);

/// Check if the specified variable is captured  by 'target' directive.
/// \param Level Relative level of nested OpenMP construct for that the check
/// is performed.
bool isOpenMPTargetCapturedDecl(const ValueDecl *D, unsigned Level) const;

ExprResult PerformOpenMPImplicitIntegerConversion(SourceLocation OpLoc,
                                                  Expr *Op);
/// Called on start of new data sharing attribute block.
void StartOpenMPDSABlock(OpenMPDirectiveKind K,
                         const DeclarationNameInfo &DirName, Scope *CurScope,
                         SourceLocation Loc);
/// Start analysis of clauses.
void StartOpenMPClause(OpenMPClauseKind K);
/// End analysis of clauses.
void EndOpenMPClause();
/// Called on end of data sharing attribute block.
void EndOpenMPDSABlock(Stmt *CurDirective);

/// Check if the current region is an OpenMP loop region and if it is,
/// mark loop control variable, used in \p Init for loop initialization, as
/// private by default.
/// \param Init First part of the for loop.
void ActOnOpenMPLoopInitialization(SourceLocation ForLoc, Stmt *Init);

// OpenMP directives and clauses.
/// Called on correct id-expression from the '#pragma omp
/// threadprivate'.
ExprResult ActOnOpenMPIdExpression(Scope *CurScope, CXXScopeSpec &ScopeSpec,
                                   const DeclarationNameInfo &Id,
                                   OpenMPDirectiveKind Kind);
/// Called on well-formed '#pragma omp threadprivate'.
DeclGroupPtrTy ActOnOpenMPThreadprivateDirective(
                                   SourceLocation Loc,
                                   ArrayRef<Expr *> VarList);
/// Builds a new OpenMPThreadPrivateDecl and checks its correctness.
OMPThreadPrivateDecl *CheckOMPThreadPrivateDecl(SourceLocation Loc,
                                                ArrayRef<Expr *> VarList);
/// Called on well-formed '#pragma omp allocate'.
DeclGroupPtrTy ActOnOpenMPAllocateDirective(SourceLocation Loc,
                                            ArrayRef<Expr *> VarList,
                                            ArrayRef<OMPClause *> Clauses,
                                            DeclContext *Owner = nullptr);
/// Called on well-formed '#pragma omp requires'.
DeclGroupPtrTy ActOnOpenMPRequiresDirective(SourceLocation Loc,
                                            ArrayRef<OMPClause *> ClauseList);
/// Check restrictions on Requires directive
OMPRequiresDecl *CheckOMPRequiresDecl(SourceLocation Loc,
                                      ArrayRef<OMPClause *> Clauses);
/// Check if the specified type is allowed to be used in 'omp declare
/// reduction' construct.
QualType ActOnOpenMPDeclareReductionType(SourceLocation TyLoc,
                                         TypeResult ParsedType);
/// Called on start of '#pragma omp declare reduction'.
DeclGroupPtrTy ActOnOpenMPDeclareReductionDirectiveStart(
    Scope *S, DeclContext *DC, DeclarationName Name,
    ArrayRef<std::pair<QualType, SourceLocation>> ReductionTypes,
    AccessSpecifier AS, Decl *PrevDeclInScope = nullptr);
/// Initialize declare reduction construct initializer.
void ActOnOpenMPDeclareReductionCombinerStart(Scope *S, Decl *D);
/// Finish current declare reduction construct initializer.
void ActOnOpenMPDeclareReductionCombinerEnd(Decl *D, Expr *Combiner);
/// Initialize declare reduction construct initializer.
/// \return omp_priv variable.
VarDecl *ActOnOpenMPDeclareReductionInitializerStart(Scope *S, Decl *D);
/// Finish current declare reduction construct initializer.
void ActOnOpenMPDeclareReductionInitializerEnd(Decl *D, Expr *Initializer,
                                               VarDecl *OmpPrivParm);
/// Called at the end of '#pragma omp declare reduction'.
DeclGroupPtrTy ActOnOpenMPDeclareReductionDirectiveEnd(
    Scope *S, DeclGroupPtrTy DeclReductions, bool IsValid);

/// Check variable declaration in 'omp declare mapper' construct.
TypeResult ActOnOpenMPDeclareMapperVarDecl(Scope *S, Declarator &D);
/// Check if the specified type is allowed to be used in 'omp declare
/// mapper' construct.
QualType ActOnOpenMPDeclareMapperType(SourceLocation TyLoc,
                                      TypeResult ParsedType);
/// Called on start of '#pragma omp declare mapper'.
OMPDeclareMapperDecl *ActOnOpenMPDeclareMapperDirectiveStart(
    Scope *S, DeclContext *DC, DeclarationName Name, QualType MapperType,
    SourceLocation StartLoc, DeclarationName VN, AccessSpecifier AS,
    Decl *PrevDeclInScope = nullptr);
/// Build the mapper variable of '#pragma omp declare mapper'.
void ActOnOpenMPDeclareMapperDirectiveVarDecl(OMPDeclareMapperDecl *DMD,
                                              Scope *S, QualType MapperType,
                                              SourceLocation StartLoc,
                                              DeclarationName VN);
/// Called at the end of '#pragma omp declare mapper'.
DeclGroupPtrTy
ActOnOpenMPDeclareMapperDirectiveEnd(OMPDeclareMapperDecl *D, Scope *S,
                                     ArrayRef<OMPClause *> ClauseList);

/// Called on the start of target region i.e. '#pragma omp declare target'.
bool ActOnStartOpenMPDeclareTargetDirective(SourceLocation Loc);
/// Called at the end of target region i.e. '#pragme omp end declare target'.
void ActOnFinishOpenMPDeclareTargetDirective();
/// Called on correct id-expression from the '#pragma omp declare target'.
void ActOnOpenMPDeclareTargetName(Scope *CurScope, CXXScopeSpec &ScopeSpec,
                                  const DeclarationNameInfo &Id,
                                  OMPDeclareTargetDeclAttr::MapTypeTy MT,
                                  NamedDeclSetType &SameDirectiveDecls);
/// Check declaration inside target region.
void
checkDeclIsAllowedInOpenMPTarget(Expr *E, Decl *D,
                                 SourceLocation IdLoc = SourceLocation());
/// Return true inside OpenMP declare target region.
bool isInOpenMPDeclareTargetContext() const {
  return DeclareTargetNestingLevel > 0;
}
/// Return true inside OpenMP target region.
bool isInOpenMPTargetExecutionDirective() const;
/// Return true if (un)supported features for the current target should be
/// diagnosed if OpenMP (offloading) is enabled.
bool shouldDiagnoseTargetSupportFromOpenMP() const {
  return !getLangOpts().OpenMPIsDevice || isInOpenMPDeclareTargetContext() ||
    isInOpenMPTargetExecutionDirective();
}

/// Return the number of captured regions created for an OpenMP directive.
static int getOpenMPCaptureLevels(OpenMPDirectiveKind Kind);

/// Initialization of captured region for OpenMP region.
void ActOnOpenMPRegionStart(OpenMPDirectiveKind DKind, Scope *CurScope);
/// End of OpenMP region.
///
/// \param S Statement associated with the current OpenMP region.
/// \param Clauses List of clauses for the current OpenMP region.
///
/// \returns Statement for finished OpenMP region.
StmtResult ActOnOpenMPRegionEnd(StmtResult S, ArrayRef<OMPClause *> Clauses);
StmtResult ActOnOpenMPExecutableDirective(
    OpenMPDirectiveKind Kind, const DeclarationNameInfo &DirName,
    OpenMPDirectiveKind CancelRegion, ArrayRef<OMPClause *> Clauses,
    Stmt *AStmt, SourceLocation StartLoc, SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp parallel' after parsing
/// of the  associated statement.
StmtResult ActOnOpenMPParallelDirective(ArrayRef<OMPClause *> Clauses,
                                        Stmt *AStmt,
                                        SourceLocation StartLoc,
                                        SourceLocation EndLoc);
using VarsWithInheritedDSAType =
    llvm::SmallDenseMap<const ValueDecl *, const Expr *, 4>;
/// Called on well-formed '\#pragma omp simd' after parsing
/// of the associated statement.
StmtResult
ActOnOpenMPSimdDirective(ArrayRef<OMPClause *> Clauses, Stmt *AStmt,
                         SourceLocation StartLoc, SourceLocation EndLoc,
                         VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp for' after parsing
/// of the associated statement.
StmtResult
ActOnOpenMPForDirective(ArrayRef<OMPClause *> Clauses, Stmt *AStmt,
                        SourceLocation StartLoc, SourceLocation EndLoc,
                        VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp for simd' after parsing
/// of the associated statement.
StmtResult
ActOnOpenMPForSimdDirective(ArrayRef<OMPClause *> Clauses, Stmt *AStmt,
                            SourceLocation StartLoc, SourceLocation EndLoc,
                            VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp sections' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPSectionsDirective(ArrayRef<OMPClause *> Clauses,
                                        Stmt *AStmt, SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp section' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPSectionDirective(Stmt *AStmt, SourceLocation StartLoc,
                                       SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp single' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPSingleDirective(ArrayRef<OMPClause *> Clauses,
                                      Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp master' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPMasterDirective(Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp critical' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPCriticalDirective(const DeclarationNameInfo &DirName,
                                        ArrayRef<OMPClause *> Clauses,
                                        Stmt *AStmt, SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp parallel for' after parsing
/// of the  associated statement.
StmtResult ActOnOpenMPParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp parallel for simd' after
/// parsing of the  associated statement.
StmtResult ActOnOpenMPParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp parallel sections' after
/// parsing of the  associated statement.
StmtResult ActOnOpenMPParallelSectionsDirective(ArrayRef<OMPClause *> Clauses,
                                                Stmt *AStmt,
                                                SourceLocation StartLoc,
                                                SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp task' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTaskDirective(ArrayRef<OMPClause *> Clauses,
                                    Stmt *AStmt, SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp taskyield'.
StmtResult ActOnOpenMPTaskyieldDirective(SourceLocation StartLoc,
                                         SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp barrier'.
StmtResult ActOnOpenMPBarrierDirective(SourceLocation StartLoc,
                                       SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp taskwait'.
StmtResult ActOnOpenMPTaskwaitDirective(SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp taskgroup'.
StmtResult ActOnOpenMPTaskgroupDirective(ArrayRef<OMPClause *> Clauses,
                                         Stmt *AStmt, SourceLocation StartLoc,
                                         SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp flush'.
StmtResult ActOnOpenMPFlushDirective(ArrayRef<OMPClause *> Clauses,
                                     SourceLocation StartLoc,
                                     SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp ordered' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPOrderedDirective(ArrayRef<OMPClause *> Clauses,
                                       Stmt *AStmt, SourceLocation StartLoc,
                                       SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp atomic' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPAtomicDirective(ArrayRef<OMPClause *> Clauses,
                                      Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp target' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTargetDirective(ArrayRef<OMPClause *> Clauses,
                                      Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp target data' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTargetDataDirective(ArrayRef<OMPClause *> Clauses,
                                          Stmt *AStmt, SourceLocation StartLoc,
                                          SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp target enter data' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetEnterDataDirective(ArrayRef<OMPClause *> Clauses,
                                               SourceLocation StartLoc,
                                               SourceLocation EndLoc,
                                               Stmt *AStmt);
/// Called on well-formed '\#pragma omp target exit data' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetExitDataDirective(ArrayRef<OMPClause *> Clauses,
                                              SourceLocation StartLoc,
                                              SourceLocation EndLoc,
                                              Stmt *AStmt);
/// Called on well-formed '\#pragma omp target parallel' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetParallelDirective(ArrayRef<OMPClause *> Clauses,
                                              Stmt *AStmt,
                                              SourceLocation StartLoc,
                                              SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp target parallel for' after
/// parsing of the  associated statement.
StmtResult ActOnOpenMPTargetParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTeamsDirective(ArrayRef<OMPClause *> Clauses,
                                     Stmt *AStmt, SourceLocation StartLoc,
                                     SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp cancellation point'.
StmtResult
ActOnOpenMPCancellationPointDirective(SourceLocation StartLoc,
                                      SourceLocation EndLoc,
                                      OpenMPDirectiveKind CancelRegion);
/// Called on well-formed '\#pragma omp cancel'.
StmtResult ActOnOpenMPCancelDirective(ArrayRef<OMPClause *> Clauses,
                                      SourceLocation StartLoc,
                                      SourceLocation EndLoc,
                                      OpenMPDirectiveKind CancelRegion);
/// Called on well-formed '\#pragma omp taskloop' after parsing of the
/// associated statement.
StmtResult
ActOnOpenMPTaskLoopDirective(ArrayRef<OMPClause *> Clauses, Stmt *AStmt,
                             SourceLocation StartLoc, SourceLocation EndLoc,
                             VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp taskloop simd' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTaskLoopSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp distribute' after parsing
/// of the associated statement.
StmtResult
ActOnOpenMPDistributeDirective(ArrayRef<OMPClause *> Clauses, Stmt *AStmt,
                               SourceLocation StartLoc, SourceLocation EndLoc,
                               VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target update'.
StmtResult ActOnOpenMPTargetUpdateDirective(ArrayRef<OMPClause *> Clauses,
                                            SourceLocation StartLoc,
                                            SourceLocation EndLoc,
                                            Stmt *AStmt);
/// Called on well-formed '\#pragma omp distribute parallel for' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPDistributeParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp distribute parallel for simd'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPDistributeParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp distribute simd' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPDistributeSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target parallel for simd' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target simd' after parsing of
/// the associated statement.
StmtResult
ActOnOpenMPTargetSimdDirective(ArrayRef<OMPClause *> Clauses, Stmt *AStmt,
                               SourceLocation StartLoc, SourceLocation EndLoc,
                               VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTeamsDistributeDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute simd' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPTeamsDistributeSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute parallel for simd'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPTeamsDistributeParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute parallel for'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPTeamsDistributeParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTargetTeamsDirective(ArrayRef<OMPClause *> Clauses,
                                           Stmt *AStmt,
                                           SourceLocation StartLoc,
                                           SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp target teams distribute' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams distribute parallel for'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams distribute parallel for
/// simd' after parsing of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams distribute simd' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);

/// Checks correctness of linear modifiers.
bool CheckOpenMPLinearModifier(OpenMPLinearClauseKind LinKind,
                               SourceLocation LinLoc);
/// Checks that the specified declaration matches requirements for the linear
/// decls.
bool CheckOpenMPLinearDecl(const ValueDecl *D, SourceLocation ELoc,
                           OpenMPLinearClauseKind LinKind, QualType Type);

/// Called on well-formed '\#pragma omp declare simd' after parsing of
/// the associated method/function.
DeclGroupPtrTy ActOnOpenMPDeclareSimdDirective(
    DeclGroupPtrTy DG, OMPDeclareSimdDeclAttr::BranchStateTy BS,
    Expr *Simdlen, ArrayRef<Expr *> Uniforms, ArrayRef<Expr *> Aligneds,
    ArrayRef<Expr *> Alignments, ArrayRef<Expr *> Linears,
    ArrayRef<unsigned> LinModifiers, ArrayRef<Expr *> Steps, SourceRange SR);

OMPClause *ActOnOpenMPSingleExprClause(OpenMPClauseKind Kind,
                                       Expr *Expr,
                                       SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc);
/// Called on well-formed 'allocator' clause.
OMPClause *ActOnOpenMPAllocatorClause(Expr *Allocator,
                                      SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation EndLoc);
/// Called on well-formed 'if' clause.
OMPClause *ActOnOpenMPIfClause(OpenMPDirectiveKind NameModifier,
                               Expr *Condition, SourceLocation StartLoc,
                               SourceLocation LParenLoc,
                               SourceLocation NameModifierLoc,
                               SourceLocation ColonLoc,
                               SourceLocation EndLoc);
/// Called on well-formed 'final' clause.
OMPClause *ActOnOpenMPFinalClause(Expr *Condition, SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc);
/// Called on well-formed 'num_threads' clause.
OMPClause *ActOnOpenMPNumThreadsClause(Expr *NumThreads,
                                       SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc);
/// Called on well-formed 'safelen' clause.
OMPClause *ActOnOpenMPSafelenClause(Expr *Length,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// Called on well-formed 'simdlen' clause.
OMPClause *ActOnOpenMPSimdlenClause(Expr *Length, SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// Called on well-formed 'collapse' clause.
OMPClause *ActOnOpenMPCollapseClause(Expr *NumForLoops,
                                     SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// Called on well-formed 'ordered' clause.
OMPClause *
ActOnOpenMPOrderedClause(SourceLocation StartLoc, SourceLocation EndLoc,
                         SourceLocation LParenLoc = SourceLocation(),
                         Expr *NumForLoops = nullptr);
/// Called on well-formed 'grainsize' clause.
OMPClause *ActOnOpenMPGrainsizeClause(Expr *Size, SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation EndLoc);
/// Called on well-formed 'num_tasks' clause.
OMPClause *ActOnOpenMPNumTasksClause(Expr *NumTasks, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// Called on well-formed 'hint' clause.
OMPClause *ActOnOpenMPHintClause(Expr *Hint, SourceLocation StartLoc,
                                 SourceLocation LParenLoc,
                                 SourceLocation EndLoc);

OMPClause *ActOnOpenMPSimpleClause(OpenMPClauseKind Kind,
                                   unsigned Argument,
                                   SourceLocation ArgumentLoc,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// Called on well-formed 'default' clause.
OMPClause *ActOnOpenMPDefaultClause(OpenMPDefaultClauseKind Kind,
                                    SourceLocation KindLoc,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// Called on well-formed 'proc_bind' clause.
OMPClause *ActOnOpenMPProcBindClause(OpenMPProcBindClauseKind Kind,
                                     SourceLocation KindLoc,
                                     SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);

OMPClause *ActOnOpenMPSingleExprWithArgClause(
    OpenMPClauseKind Kind, ArrayRef<unsigned> Arguments, Expr *Expr,
    SourceLocation StartLoc, SourceLocation LParenLoc,
    ArrayRef<SourceLocation> ArgumentsLoc, SourceLocation DelimLoc,
    SourceLocation EndLoc);
/// Called on well-formed 'schedule' clause.
OMPClause *ActOnOpenMPScheduleClause(
    OpenMPScheduleClauseModifier M1, OpenMPScheduleClauseModifier M2,
    OpenMPScheduleClauseKind Kind, Expr *ChunkSize, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation M1Loc, SourceLocation M2Loc,
    SourceLocation KindLoc, SourceLocation CommaLoc, SourceLocation EndLoc);

OMPClause *ActOnOpenMPClause(OpenMPClauseKind Kind, SourceLocation StartLoc,
                             SourceLocation EndLoc);
/// Called on well-formed 'nowait' clause.
OMPClause *ActOnOpenMPNowaitClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// Called on well-formed 'untied' clause.
OMPClause *ActOnOpenMPUntiedClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// Called on well-formed 'mergeable' clause.
OMPClause *ActOnOpenMPMergeableClause(SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// Called on well-formed 'read' clause.
OMPClause *ActOnOpenMPReadClause(SourceLocation StartLoc,
                                 SourceLocation EndLoc);
/// Called on well-formed 'write' clause.
OMPClause *ActOnOpenMPWriteClause(SourceLocation StartLoc,
                                  SourceLocation EndLoc);
/// Called on well-formed 'update' clause.
OMPClause *ActOnOpenMPUpdateClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// Called on well-formed 'capture' clause.
OMPClause *ActOnOpenMPCaptureClause(SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// Called on well-formed 'seq_cst' clause.
OMPClause *ActOnOpenMPSeqCstClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// Called on well-formed 'threads' clause.
OMPClause *ActOnOpenMPThreadsClause(SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// Called on well-formed 'simd' clause.
OMPClause *ActOnOpenMPSIMDClause(SourceLocation StartLoc,
                                 SourceLocation EndLoc);
/// Called on well-formed 'nogroup' clause.
OMPClause *ActOnOpenMPNogroupClause(SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// Called on well-formed 'unified_address' clause.
OMPClause *ActOnOpenMPUnifiedAddressClause(SourceLocation StartLoc,
                                           SourceLocation EndLoc);

/// Called on well-formed 'unified_address' clause.
OMPClause *ActOnOpenMPUnifiedSharedMemoryClause(SourceLocation StartLoc,
                                                SourceLocation EndLoc);

/// Called on well-formed 'reverse_offload' clause.
OMPClause *ActOnOpenMPReverseOffloadClause(SourceLocation StartLoc,
                                           SourceLocation EndLoc);

/// Called on well-formed 'dynamic_allocators' clause.
OMPClause *ActOnOpenMPDynamicAllocatorsClause(SourceLocation StartLoc,
                                              SourceLocation EndLoc);

/// Called on well-formed 'atomic_default_mem_order' clause.
OMPClause *ActOnOpenMPAtomicDefaultMemOrderClause(
    OpenMPAtomicDefaultMemOrderClauseKind Kind, SourceLocation KindLoc,
    SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation EndLoc);

OMPClause *ActOnOpenMPVarListClause(
    OpenMPClauseKind Kind, ArrayRef<Expr *> Vars, Expr *TailExpr,
    const OMPVarListLocTy &Locs, SourceLocation ColonLoc,
    CXXScopeSpec &ReductionOrMapperIdScopeSpec,
    DeclarationNameInfo &ReductionOrMapperId, OpenMPDependClauseKind DepKind,
    OpenMPLinearClauseKind LinKind,
    ArrayRef<OpenMPMapModifierKind> MapTypeModifiers,
    ArrayRef<SourceLocation> MapTypeModifiersLoc, OpenMPMapClauseKind MapType,
    bool IsMapTypeImplicit, SourceLocation DepLinMapLoc);
/// Called on well-formed 'allocate' clause.
OMPClause *
ActOnOpenMPAllocateClause(Expr *Allocator, ArrayRef<Expr *> VarList,
                          SourceLocation StartLoc, SourceLocation ColonLoc,
                          SourceLocation LParenLoc, SourceLocation EndLoc);
/// Called on well-formed 'private' clause.
OMPClause *ActOnOpenMPPrivateClause(ArrayRef<Expr *> VarList,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// Called on well-formed 'firstprivate' clause.
OMPClause *ActOnOpenMPFirstprivateClause(ArrayRef<Expr *> VarList,
                                         SourceLocation StartLoc,
                                         SourceLocation LParenLoc,
                                         SourceLocation EndLoc);
/// Called on well-formed 'lastprivate' clause.
OMPClause *ActOnOpenMPLastprivateClause(ArrayRef<Expr *> VarList,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);
/// Called on well-formed 'shared' clause.
OMPClause *ActOnOpenMPSharedClause(ArrayRef<Expr *> VarList,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// Called on well-formed 'reduction' clause.
OMPClause *ActOnOpenMPReductionClause(
    ArrayRef<Expr *> VarList, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId,
    ArrayRef<Expr *> UnresolvedReductions = llvm::None);
/// Called on well-formed 'task_reduction' clause.
OMPClause *ActOnOpenMPTaskReductionClause(
    ArrayRef<Expr *> VarList, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId,
    ArrayRef<Expr *> UnresolvedReductions = llvm::None);
/// Called on well-formed 'in_reduction' clause.
OMPClause *ActOnOpenMPInReductionClause(
    ArrayRef<Expr *> VarList, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId,
    ArrayRef<Expr *> UnresolvedReductions = llvm::None);
/// Called on well-formed 'linear' clause.
OMPClause *
ActOnOpenMPLinearClause(ArrayRef<Expr *> VarList, Expr *Step,
                        SourceLocation StartLoc, SourceLocation LParenLoc,
                        OpenMPLinearClauseKind LinKind, SourceLocation LinLoc,
                        SourceLocation ColonLoc, SourceLocation EndLoc);
/// Called on well-formed 'aligned' clause.
OMPClause *ActOnOpenMPAlignedClause(ArrayRef<Expr *> VarList,
                                    Expr *Alignment,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation ColonLoc,
                                    SourceLocation EndLoc);
/// Called on well-formed 'copyin' clause.
OMPClause *ActOnOpenMPCopyinClause(ArrayRef<Expr *> VarList,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// Called on well-formed 'copyprivate' clause.
OMPClause *ActOnOpenMPCopyprivateClause(ArrayRef<Expr *> VarList,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);
/// Called on well-formed 'flush' pseudo clause.
OMPClause *ActOnOpenMPFlushClause(ArrayRef<Expr *> VarList,
                                  SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc);
/// Called on well-formed 'depend' clause.
OMPClause *
ActOnOpenMPDependClause(OpenMPDependClauseKind DepKind, SourceLocation DepLoc,
                        SourceLocation ColonLoc, ArrayRef<Expr *> VarList,
                        SourceLocation StartLoc, SourceLocation LParenLoc,
                        SourceLocation EndLoc);
/// Called on well-formed 'device' clause.
OMPClause *ActOnOpenMPDeviceClause(Expr *Device, SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// Called on well-formed 'map' clause.
OMPClause *
ActOnOpenMPMapClause(ArrayRef<OpenMPMapModifierKind> MapTypeModifiers,
                     ArrayRef<SourceLocation> MapTypeModifiersLoc,
                     CXXScopeSpec &MapperIdScopeSpec,
                     DeclarationNameInfo &MapperId,
                     OpenMPMapClauseKind MapType, bool IsMapTypeImplicit,
                     SourceLocation MapLoc, SourceLocation ColonLoc,
                     ArrayRef<Expr *> VarList, const OMPVarListLocTy &Locs,
                     ArrayRef<Expr *> UnresolvedMappers = llvm::None);
/// Called on well-formed 'num_teams' clause.
OMPClause *ActOnOpenMPNumTeamsClause(Expr *NumTeams, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// Called on well-formed 'thread_limit' clause.
OMPClause *ActOnOpenMPThreadLimitClause(Expr *ThreadLimit,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);
/// Called on well-formed 'priority' clause.
OMPClause *ActOnOpenMPPriorityClause(Expr *Priority, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// Called on well-formed 'dist_schedule' clause.
OMPClause *ActOnOpenMPDistScheduleClause(
    OpenMPDistScheduleClauseKind Kind, Expr *ChunkSize,
    SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation KindLoc,
    SourceLocation CommaLoc, SourceLocation EndLoc);
/// Called on well-formed 'defaultmap' clause.
OMPClause *ActOnOpenMPDefaultmapClause(
    OpenMPDefaultmapClauseModifier M, OpenMPDefaultmapClauseKind Kind,
    SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation MLoc,
    SourceLocation KindLoc, SourceLocation EndLoc);
/// Called on well-formed 'to' clause.
OMPClause *
ActOnOpenMPToClause(ArrayRef<Expr *> VarList, CXXScopeSpec &MapperIdScopeSpec,
                    DeclarationNameInfo &MapperId,
                    const OMPVarListLocTy &Locs,
                    ArrayRef<Expr *> UnresolvedMappers = llvm::None);
/// Called on well-formed 'from' clause.
OMPClause *ActOnOpenMPFromClause(
    ArrayRef<Expr *> VarList, CXXScopeSpec &MapperIdScopeSpec,
    DeclarationNameInfo &MapperId, const OMPVarListLocTy &Locs,
    ArrayRef<Expr *> UnresolvedMappers = llvm::None);
/// Called on well-formed 'use_device_ptr' clause.
OMPClause *ActOnOpenMPUseDevicePtrClause(ArrayRef<Expr *> VarList,
                                         const OMPVarListLocTy &Locs);
/// Called on well-formed 'is_device_ptr' clause.
OMPClause *ActOnOpenMPIsDevicePtrClause(ArrayRef<Expr *> VarList,
                                        const OMPVarListLocTy &Locs);

/// The kind of conversion being performed.
enum CheckedConversionKind {
  /// An implicit conversion.
  CCK_ImplicitConversion,
  /// A C-style cast.
  CCK_CStyleCast,
  /// A functional-style cast.
  CCK_FunctionalCast,
  /// A cast other than a C-style cast.
  CCK_OtherCast,
  /// A conversion for an operand of a builtin overloaded operator.
  CCK_ForBuiltinOverloadedOp
};

static bool isCast(CheckedConversionKind CCK) {
  return CCK == CCK_CStyleCast || CCK == CCK_FunctionalCast ||
         CCK == CCK_OtherCast;
}

/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit
/// cast.  If there is already an implicit cast, merge into the existing one.
/// If isLvalue, the result of the cast is an lvalue.
ExprResult ImpCastExprToType(Expr *E, QualType Type, CastKind CK,
                             ExprValueKind VK = VK_RValue,
                             const CXXCastPath *BasePath = nullptr,
                             CheckedConversionKind CCK
                                = CCK_ImplicitConversion);

/// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
/// to the conversion from scalar type ScalarTy to the Boolean type.
static CastKind ScalarTypeToBooleanCastKind(QualType ScalarTy);

/// IgnoredValueConversions - Given that an expression's result is
/// syntactically ignored, perform any conversions that are
/// required.
ExprResult IgnoredValueConversions(Expr *E);

// UsualUnaryConversions - promotes integers (C99 6.3.1.1p2) and converts
// functions and arrays to their respective pointers (C99 6.3.2.1).
ExprResult UsualUnaryConversions(Expr *E);

/// CallExprUnaryConversions - a special case of an unary conversion
/// performed on a function designator of a call expression.
ExprResult CallExprUnaryConversions(Expr *E);

// DefaultFunctionArrayConversion - converts functions and arrays
// to their respective pointers (C99 6.3.2.1).
ExprResult DefaultFunctionArrayConversion(Expr *E, bool Diagnose = true);

// DefaultFunctionArrayLvalueConversion - converts functions and
// arrays to their respective pointers and performs the
// lvalue-to-rvalue conversion.
ExprResult DefaultFunctionArrayLvalueConversion(Expr *E,
                                                bool Diagnose = true);

// DefaultLvalueConversion - performs lvalue-to-rvalue conversion on
// the operand.  This is DefaultFunctionArrayLvalueConversion,
// except that it assumes the operand isn't of function or array
// type.
ExprResult DefaultLvalueConversion(Expr *E);

// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
// do not have a prototype. Integer promotions are performed on each
// argument, and arguments that have type float are promoted to double.
ExprResult DefaultArgumentPromotion(Expr *E);

/// If \p E is a prvalue denoting an unmaterialized temporary, materialize
/// it as an xvalue. In C++98, the result will still be a prvalue, because
/// we don't have xvalues there.
ExprResult TemporaryMaterializationConversion(Expr *E);

// Used for emitting the right warning by DefaultVariadicArgumentPromotion
enum VariadicCallType {
  VariadicFunction,
  VariadicBlock,
  VariadicMethod,
  VariadicConstructor,
  VariadicDoesNotApply
};

VariadicCallType getVariadicCallType(FunctionDecl *FDecl,
                                     const FunctionProtoType *Proto,
                                     Expr *Fn);

// Used for determining in which context a type is allowed to be passed to a
// vararg function.
enum VarArgKind {
  VAK_Valid,
  VAK_ValidInCXX11,
  VAK_Undefined,
  VAK_MSVCUndefined,
  VAK_Invalid
};

// Determines which VarArgKind fits an expression.
VarArgKind isValidVarArgType(const QualType &Ty);

/// Check to see if the given expression is a valid argument to a variadic
/// function, issuing a diagnostic if not.
void checkVariadicArgument(const Expr *E, VariadicCallType CT);

/// Check to see if a given expression could have '.c_str()' called on it.
bool hasCStrMethod(const Expr *E);

/// GatherArgumentsForCall - Collector argument expressions for various
/// form of call prototypes.
bool GatherArgumentsForCall(SourceLocation CallLoc, FunctionDecl *FDecl,
                            const FunctionProtoType *Proto,
                            unsigned FirstParam, ArrayRef<Expr *> Args,
                            SmallVectorImpl<Expr *> &AllArgs,
                            VariadicCallType CallType = VariadicDoesNotApply,
                            bool AllowExplicit = false,
                            bool IsListInitialization = false);

// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
// will create a runtime trap if the resulting type is not a POD type.
ExprResult DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
                                            FunctionDecl *FDecl);

// UsualArithmeticConversions - performs the UsualUnaryConversions on it's
// operands and then handles various conversions that are common to binary
// operators (C99 6.3.1.8). If both operands aren't arithmetic, this
// routine returns the first non-arithmetic type found. The client is
// responsible for emitting appropriate error diagnostics.
QualType UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
                                    bool IsCompAssign = false);

/// AssignConvertType - All of the 'assignment' semantic checks return this
/// enum to indicate whether the assignment was allowed.  These checks are
/// done for simple assignments, as well as initialization, return from
/// function, argument passing, etc.  The query is phrased in terms of a
/// source and destination type.
enum AssignConvertType {
  /// Compatible - the types are compatible according to the standard.
  Compatible,

  /// PointerToInt - The assignment converts a pointer to an int, which we
  /// accept as an extension.
  PointerToInt,

  /// IntToPointer - The assignment converts an int to a pointer, which we
  /// accept as an extension.
  IntToPointer,

  /// FunctionVoidPointer - The assignment is between a function pointer and
  /// void*, which the standard doesn't allow, but we accept as an extension.
  FunctionVoidPointer,

  /// IncompatiblePointer - The assignment is between two pointers types that
  /// are not compatible, but we accept them as an extension.
  IncompatiblePointer,

  /// IncompatiblePointerSign - The assignment is between two pointers types
  /// which point to integers which have a different sign, but are otherwise
  /// identical. This is a subset of the above, but broken out because it's by
  /// far the most common case of incompatible pointers.
  IncompatiblePointerSign,

  /// CompatiblePointerDiscardsQualifiers - The assignment discards
  /// c/v/r qualifiers, which we accept as an extension.
  CompatiblePointerDiscardsQualifiers,

  /// IncompatiblePointerDiscardsQualifiers - The assignment
  /// discards qualifiers that we don't permit to be discarded,
  /// like address spaces.
  IncompatiblePointerDiscardsQualifiers,

  /// IncompatibleNestedPointerAddressSpaceMismatch - The assignment
  /// changes address spaces in nested pointer types which is not allowed.
  /// For instance, converting __private int ** to __generic int ** is
  /// illegal even though __private could be converted to __generic.
  IncompatibleNestedPointerAddressSpaceMismatch,

  /// IncompatibleNestedPointerQualifiers - The assignment is between two
  /// nested pointer types, and the qualifiers other than the first two
  /// levels differ e.g. char ** -> const char **, but we accept them as an
  /// extension.
  IncompatibleNestedPointerQualifiers,

  /// IncompatibleVectors - The assignment is between two vector types that
  /// have the same size, which we accept as an extension.
  IncompatibleVectors,

  /// IntToBlockPointer - The assignment converts an int to a block
  /// pointer. We disallow this.
  IntToBlockPointer,

  /// IncompatibleBlockPointer - The assignment is between two block
  /// pointers types that are not compatible.
  IncompatibleBlockPointer,

  /// IncompatibleObjCQualifiedId - The assignment is between a qualified
  /// id type and something else (that is incompatible with it). For example,
  /// "id <XXX>" = "Foo *", where "Foo *" doesn't implement the XXX protocol.
  IncompatibleObjCQualifiedId,

  /// IncompatibleObjCWeakRef - Assigning a weak-unavailable object to an
  /// object with __weak qualifier.
  IncompatibleObjCWeakRef,

  /// Incompatible - We reject this conversion outright, it is invalid to
  /// represent it in the AST.
  Incompatible
};

/// DiagnoseAssignmentResult - Emit a diagnostic, if required, for the
/// assignment conversion type specified by ConvTy.  This returns true if the
/// conversion was invalid or false if the conversion was accepted.
bool DiagnoseAssignmentResult(AssignConvertType ConvTy,
                              SourceLocation Loc,
                              QualType DstType, QualType SrcType,
                              Expr *SrcExpr, AssignmentAction Action,
                              bool *Complained = nullptr);

/// IsValueInFlagEnum - Determine if a value is allowed as part of a flag
/// enum. If AllowMask is true, then we also allow the complement of a valid
/// value, to be used as a mask.
bool IsValueInFlagEnum(const EnumDecl *ED, const llvm::APInt &Val,
                       bool AllowMask) const;

/// DiagnoseAssignmentEnum - Warn if assignment to enum is a constant
/// integer not in the range of enum values.
void DiagnoseAssignmentEnum(QualType DstType, QualType SrcType,
                            Expr *SrcExpr);

/// CheckAssignmentConstraints - Perform type checking for assignment,
/// argument passing, variable initialization, and function return values.
/// C99 6.5.16.
AssignConvertType CheckAssignmentConstraints(SourceLocation Loc,
                                             QualType LHSType,
                                             QualType RHSType);

/// Check assignment constraints and optionally prepare for a conversion of
/// the RHS to the LHS type. The conversion is prepared for if ConvertRHS
/// is true.
AssignConvertType CheckAssignmentConstraints(QualType LHSType,
                                             ExprResult &RHS,
                                             CastKind &Kind,
                                             bool ConvertRHS = true);

/// Check assignment constraints for an assignment of RHS to LHSType.
///
/// \param LHSType The destination type for the assignment.
/// \param RHS The source expression for the assignment.
/// \param Diagnose If \c true, diagnostics may be produced when checking
///        for assignability. If a diagnostic is produced, \p RHS will be
///        set to ExprError(). Note that this function may still return
///        without producing a diagnostic, even for an invalid assignment.
/// \param DiagnoseCFAudited If \c true, the target is a function parameter
///        in an audited Core Foundation API and does not need to be checked
///        for ARC retain issues.
/// \param ConvertRHS If \c true, \p RHS will be updated to model the
///        conversions necessary to perform the assignment. If \c false,
///        \p Diagnose must also be \c false.
AssignConvertType CheckSingleAssignmentConstraints(
    QualType LHSType, ExprResult &RHS, bool Diagnose = true,
    bool DiagnoseCFAudited = false, bool ConvertRHS = true);

// If the lhs type is a transparent union, check whether we
// can initialize the transparent union with the given expression.
AssignConvertType CheckTransparentUnionArgumentConstraints(QualType ArgType,
                                                           ExprResult &RHS);

bool IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType);

bool CheckExceptionSpecCompatibility(Expr *From, QualType ToType);

ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     AssignmentAction Action,
                                     bool AllowExplicit = false);
ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     AssignmentAction Action,
                                     bool AllowExplicit,
                                     ImplicitConversionSequence& ICS);
ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     const ImplicitConversionSequence& ICS,
                                     AssignmentAction Action,
                                     CheckedConversionKind CCK
                                        = CCK_ImplicitConversion);
ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     const StandardConversionSequence& SCS,
                                     AssignmentAction Action,
                                     CheckedConversionKind CCK);

ExprResult PerformQualificationConversion(
    Expr *E, QualType Ty, ExprValueKind VK = VK_RValue,
    CheckedConversionKind CCK = CCK_ImplicitConversion);

/// the following "Check" methods will return a valid/converted QualType
/// or a null QualType (indicating an error diagnostic was issued).

/// type checking binary operators (subroutines of CreateBuiltinBinOp).
QualType InvalidOperands(SourceLocation Loc, ExprResult &LHS,
                         ExprResult &RHS);
QualType InvalidLogicalVectorOperands(SourceLocation Loc, ExprResult &LHS,
                               ExprResult &RHS);
QualType CheckPointerToMemberOperands( // C++ 5.5
  ExprResult &LHS, ExprResult &RHS, ExprValueKind &VK,
  SourceLocation OpLoc, bool isIndirect);
QualType CheckMultiplyDivideOperands( // C99 6.5.5
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign,
  bool IsDivide);
QualType CheckRemainderOperands( // C99 6.5.5
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  bool IsCompAssign = false);
QualType CheckAdditionOperands( // C99 6.5.6
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc, QualType* CompLHSTy = nullptr);
QualType CheckSubtractionOperands( // C99 6.5.6
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  QualType* CompLHSTy = nullptr);
QualType CheckShiftOperands( // C99 6.5.7
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc, bool IsCompAssign = false);
QualType CheckCompareOperands( // C99 6.5.8/9
    ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
    BinaryOperatorKind Opc);
QualType CheckBitwiseOperands( // C99 6.5.[10...12]
    ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
    BinaryOperatorKind Opc);
QualType CheckLogicalOperands( // C99 6.5.[13,14]
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc);
// CheckAssignmentOperands is used for both simple and compound assignment.
// For simple assignment, pass both expressions and a null converted type.
// For compound assignment, pass both expressions and the converted type.
QualType CheckAssignmentOperands( // C99 6.5.16.[1,2]
  Expr *LHSExpr, ExprResult &RHS, SourceLocation Loc, QualType CompoundType);

ExprResult checkPseudoObjectIncDec(Scope *S, SourceLocation OpLoc,
                                   UnaryOperatorKind Opcode, Expr *Op);
ExprResult checkPseudoObjectAssignment(Scope *S, SourceLocation OpLoc,
                                       BinaryOperatorKind Opcode,
                                       Expr *LHS, Expr *RHS);
ExprResult checkPseudoObjectRValue(Expr *E);
Expr *recreateSyntacticForm(PseudoObjectExpr *E);

QualType CheckConditionalOperands( // C99 6.5.15
  ExprResult &Cond, ExprResult &LHS, ExprResult &RHS,
  ExprValueKind &VK, ExprObjectKind &OK, SourceLocation QuestionLoc);
QualType CXXCheckConditionalOperands( // C++ 5.16
  ExprResult &cond, ExprResult &lhs, ExprResult &rhs,
  ExprValueKind &VK, ExprObjectKind &OK, SourceLocation questionLoc);
QualType FindCompositePointerType(SourceLocation Loc, Expr *&E1, Expr *&E2,
                                  bool ConvertArgs = true);
QualType FindCompositePointerType(SourceLocation Loc,
                                  ExprResult &E1, ExprResult &E2,
                                  bool ConvertArgs = true) {
  Expr *E1Tmp = E1.get(), *E2Tmp = E2.get();
  QualType Composite =
      FindCompositePointerType(Loc, E1Tmp, E2Tmp, ConvertArgs);
  E1 = E1Tmp;
  E2 = E2Tmp;
  return Composite;
}

QualType FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
                                      SourceLocation QuestionLoc);

bool DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
                                SourceLocation QuestionLoc);

void DiagnoseAlwaysNonNullPointer(Expr *E,
                                  Expr::NullPointerConstantKind NullType,
                                  bool IsEqual, SourceRange Range);

/// type checking for vector binary operators.
QualType CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
                             SourceLocation Loc, bool IsCompAssign,
                             bool AllowBothBool, bool AllowBoolConversion);
QualType GetSignedVectorType(QualType V);
QualType CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
                                    SourceLocation Loc,
                                    BinaryOperatorKind Opc);
QualType CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS,
                                    SourceLocation Loc);

bool areLaxCompatibleVectorTypes(QualType srcType, QualType destType);
bool isLaxVectorConversion(QualType srcType, QualType destType);

/// type checking declaration initializers (C99 6.7.8)
bool CheckForConstantInitializer(Expr *e, QualType t);

// type checking C++ declaration initializers (C++ [dcl.init]).

/// ReferenceCompareResult - Expresses the result of comparing two
/// types (cv1 T1 and cv2 T2) to determine their compatibility for the
/// purposes of initialization by reference (C++ [dcl.init.ref]p4).
enum ReferenceCompareResult {
  /// Ref_Incompatible - The two types are incompatible, so direct
  /// reference binding is not possible.
  Ref_Incompatible = 0,
  /// Ref_Related - The two types are reference-related, which means
  /// that their unqualified forms (T1 and T2) are either the same
  /// or T1 is a base class of T2.
  Ref_Related,
  /// Ref_Compatible - The two types are reference-compatible.
  Ref_Compatible
};

ReferenceCompareResult CompareReferenceRelationship(SourceLocation Loc,
                                                    QualType T1, QualType T2,
                                                    bool &DerivedToBase,
                                                    bool &ObjCConversion,
                                              bool &ObjCLifetimeConversion);

ExprResult checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
                               Expr *CastExpr, CastKind &CastKind,
                               ExprValueKind &VK, CXXCastPath &Path);

/// Force an expression with unknown-type to an expression of the
/// given type.
ExprResult forceUnknownAnyToType(Expr *E, QualType ToType);

/// Type-check an expression that's being passed to an
/// __unknown_anytype parameter.
ExprResult checkUnknownAnyArg(SourceLocation callLoc,
                              Expr *result, QualType &paramType);

// CheckVectorCast - check type constraints for vectors.
// Since vectors are an extension, there are no C standard reference for this.
// We allow casting between vectors and integer datatypes of the same size.
// returns true if the cast is invalid
bool CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
                     CastKind &Kind);

/// Prepare `SplattedExpr` for a vector splat operation, adding
/// implicit casts if necessary.
ExprResult prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr);

// CheckExtVectorCast - check type constraints for extended vectors.
// Since vectors are an extension, there are no C standard reference for this.
// We allow casting between vectors and integer datatypes of the same size,
// or vectors and the element type of that vector.
// returns the cast expr
ExprResult CheckExtVectorCast(SourceRange R, QualType DestTy, Expr *CastExpr,
                              CastKind &Kind);

ExprResult BuildCXXFunctionalCastExpr(TypeSourceInfo *TInfo, QualType Type,
                                      SourceLocation LParenLoc,
                                      Expr *CastExpr,
                                      SourceLocation RParenLoc);

enum ARCConversionResult { ACR_okay, ACR_unbridged, ACR_error };

/// Checks for invalid conversions and casts between
/// retainable pointers and other pointer kinds for ARC and Weak.
ARCConversionResult CheckObjCConversion(SourceRange castRange,
                                        QualType castType, Expr *&op,
                                        CheckedConversionKind CCK,
                                        bool Diagnose = true,
                                        bool DiagnoseCFAudited = false,
                                        BinaryOperatorKind Opc = BO_PtrMemD
                                        );

Expr *stripARCUnbridgedCast(Expr *e);
void diagnoseARCUnbridgedCast(Expr *e);

bool CheckObjCARCUnavailableWeakConversion(QualType castType,
                                           QualType ExprType);

/// checkRetainCycles - Check whether an Objective-C message send
/// might create an obvious retain cycle.
void checkRetainCycles(ObjCMessageExpr *msg);
void checkRetainCycles(Expr *receiver, Expr *argument);
void checkRetainCycles(VarDecl *Var, Expr *Init);

/// checkUnsafeAssigns - Check whether +1 expr is being assigned
/// to weak/__unsafe_unretained type.
bool checkUnsafeAssigns(SourceLocation Loc, QualType LHS, Expr *RHS);

/// checkUnsafeExprAssigns - Check whether +1 expr is being assigned
/// to weak/__unsafe_unretained expression.
void checkUnsafeExprAssigns(SourceLocation Loc, Expr *LHS, Expr *RHS);

/// CheckMessageArgumentTypes - Check types in an Obj-C message send.
/// \param Method - May be null.
/// \param [out] ReturnType - The return type of the send.
/// \return true iff there were any incompatible types.
bool CheckMessageArgumentTypes(const Expr *Receiver, QualType ReceiverType,
                               MultiExprArg Args, Selector Sel,
                               ArrayRef<SourceLocation> SelectorLocs,
                               ObjCMethodDecl *Method, bool isClassMessage,
                               bool isSuperMessage, SourceLocation lbrac,
                               SourceLocation rbrac, SourceRange RecRange,
                               QualType &ReturnType, ExprValueKind &VK);

/// Determine the result of a message send expression based on
/// the type of the receiver, the method expected to receive the message,
/// and the form of the message send.
QualType getMessageSendResultType(const Expr *Receiver, QualType ReceiverType,
                                  ObjCMethodDecl *Method, bool isClassMessage,
                                  bool isSuperMessage);

/// If the given expression involves a message send to a method
/// with a related result type, emit a note describing what happened.
void EmitRelatedResultTypeNote(const Expr *E);

/// Given that we had incompatible pointer types in a return
/// statement, check whether we're in a method with a related result
/// type, and if so, emit a note describing what happened.
void EmitRelatedResultTypeNoteForReturn(QualType destType);

class ConditionResult {
  Decl *ConditionVar;
  FullExprArg Condition;
  bool Invalid;
  bool HasKnownValue;
  bool KnownValue;

  friend class Sema;
  ConditionResult(Sema &S, Decl *ConditionVar, FullExprArg Condition,
                  bool IsConstexpr)
      : ConditionVar(ConditionVar), Condition(Condition), Invalid(false),
        HasKnownValue(IsConstexpr && Condition.get() &&
                      !Condition.get()->isValueDependent()),
        KnownValue(HasKnownValue &&
                   !!Condition.get()->EvaluateKnownConstInt(S.Context)) {}
  explicit ConditionResult(bool Invalid)
      : ConditionVar(nullptr), Condition(nullptr), Invalid(Invalid),
        HasKnownValue(false), KnownValue(false) {}

public:
  ConditionResult() : ConditionResult(false) {}
  bool isInvalid() const { return Invalid; }
  std::pair<VarDecl *, Expr *> get() const {
    return std::make_pair(cast_or_null<VarDecl>(ConditionVar),
                          Condition.get());
  }
  llvm::Optional<bool> getKnownValue() const {
    if (!HasKnownValue)
      return None;
    return KnownValue;
  }
};
static ConditionResult ConditionError() { return ConditionResult(true); }

enum class ConditionKind {
  Boolean,     ///< A boolean condition, from 'if', 'while', 'for', or 'do'.
  ConstexprIf, ///< A constant boolean condition from 'if constexpr'.
  Switch       ///< An integral condition for a 'switch' statement.
};

ConditionResult ActOnCondition(Scope *S, SourceLocation Loc,
                               Expr *SubExpr, ConditionKind CK);

ConditionResult ActOnConditionVariable(Decl *ConditionVar,
                                       SourceLocation StmtLoc,
                                       ConditionKind CK);

DeclResult ActOnCXXConditionDeclaration(Scope *S, Declarator &D);

ExprResult CheckConditionVariable(VarDecl *ConditionVar,
                                  SourceLocation StmtLoc,
                                  ConditionKind CK);
ExprResult CheckSwitchCondition(SourceLocation SwitchLoc, Expr *Cond);

/// CheckBooleanCondition - Diagnose problems involving the use of
/// the given expression as a boolean condition (e.g. in an if
/// statement).  Also performs the standard function and array
/// decays, possibly changing the input variable.
///
/// \param Loc - A location associated with the condition, e.g. the
/// 'if' keyword.
/// \return true iff there were any errors
ExprResult CheckBooleanCondition(SourceLocation Loc, Expr *E,
                                 bool IsConstexpr = false);

/// ActOnExplicitBoolSpecifier - Build an ExplicitSpecifier from an expression
/// found in an explicit(bool) specifier.
ExplicitSpecifier ActOnExplicitBoolSpecifier(Expr *E);

/// tryResolveExplicitSpecifier - Attempt to resolve the explict specifier.
/// Returns true if the explicit specifier is now resolved.
bool tryResolveExplicitSpecifier(ExplicitSpecifier &ExplicitSpec);

/// DiagnoseAssignmentAsCondition - Given that an expression is
/// being used as a boolean condition, warn if it's an assignment.
void DiagnoseAssignmentAsCondition(Expr *E);

/// Redundant parentheses over an equality comparison can indicate
/// that the user intended an assignment used as condition.
void DiagnoseEqualityWithExtraParens(ParenExpr *ParenE);

/// CheckCXXBooleanCondition - Returns true if conversion to bool is invalid.
ExprResult CheckCXXBooleanCondition(Expr *CondExpr, bool IsConstexpr = false);

/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have
/// the specified width and sign.  If an overflow occurs, detect it and emit
/// the specified diagnostic.
void ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &OldVal,
                                        unsigned NewWidth, bool NewSign,
                                        SourceLocation Loc, unsigned DiagID);

/// Checks that the Objective-C declaration is declared in the global scope.
/// Emits an error and marks the declaration as invalid if it's not declared
/// in the global scope.
bool CheckObjCDeclScope(Decl *D);

/// Abstract base class used for diagnosing integer constant
/// expression violations.
class VerifyICEDiagnoser {
public:
  bool Suppress;

  VerifyICEDiagnoser(bool Suppress = false) : Suppress(Suppress) { }

  virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) =0;
  virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR);
  virtual ~VerifyICEDiagnoser() { }
};

/// VerifyIntegerConstantExpression - Verifies that an expression is an ICE,
/// and reports the appropriate diagnostics. Returns false on success.
/// Can optionally return the value of the expression.
ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
                                           VerifyICEDiagnoser &Diagnoser,
                                           bool AllowFold = true);
ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
                                           unsigned DiagID,
                                           bool AllowFold = true);
ExprResult VerifyIntegerConstantExpression(Expr *E,
                                           llvm::APSInt *Result = nullptr);

/// VerifyBitField - verifies that a bit field expression is an ICE and has
/// the correct width, and that the field type is valid.
/// Returns false on success.
/// Can optionally return whether the bit-field is of width 0
ExprResult VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
                          QualType FieldTy, bool IsMsStruct,
                          Expr *BitWidth, bool *ZeroWidth = nullptr);

10224private:
unsigned ForceCUDAHostDeviceDepth = 0;

10227public:
/// Increments our count of the number of times we've seen a pragma forcing
/// functions to be __host__ __device__.  So long as this count is greater
/// than zero, all functions encountered will be __host__ __device__.
void PushForceCUDAHostDevice();

/// Decrements our count of the number of times we've seen a pragma forcing
/// functions to be __host__ __device__.  Returns false if the count is 0
/// before incrementing, so you can emit an error.
bool PopForceCUDAHostDevice();

/// Diagnostics that are emitted only if we discover that the given function
/// must be codegen'ed.  Because handling these correctly adds overhead to
/// compilation, this is currently only enabled for CUDA compilations.
llvm::DenseMap<CanonicalDeclPtr<FunctionDecl>,
               std::vector<PartialDiagnosticAt>>
    DeviceDeferredDiags;

/// A pair of a canonical FunctionDecl and a SourceLocation.  When used as the
/// key in a hashtable, both the FD and location are hashed.
struct FunctionDeclAndLoc {
  CanonicalDeclPtr<FunctionDecl> FD;
  SourceLocation Loc;
};

/// FunctionDecls and SourceLocations for which CheckCUDACall has emitted a
/// (maybe deferred) "bad call" diagnostic.  We use this to avoid emitting the
/// same deferred diag twice.
llvm::DenseSet<FunctionDeclAndLoc> LocsWithCUDACallDiags;

/// An inverse call graph, mapping known-emitted functions to one of their
/// known-emitted callers (plus the location of the call).
///
/// Functions that we can tell a priori must be emitted aren't added to this
/// map.
llvm::DenseMap</* Callee = */ CanonicalDeclPtr<FunctionDecl>,
               /* Caller = */ FunctionDeclAndLoc>
    DeviceKnownEmittedFns;

/// A partial call graph maintained during CUDA/OpenMP device code compilation
/// to support deferred diagnostics.
///
/// Functions are only added here if, at the time they're considered, they are
/// not known-emitted.  As soon as we discover that a function is
/// known-emitted, we remove it and everything it transitively calls from this
/// set and add those functions to DeviceKnownEmittedFns.
llvm::DenseMap</* Caller = */ CanonicalDeclPtr<FunctionDecl>,
               /* Callees = */ llvm::MapVector<CanonicalDeclPtr<FunctionDecl>,
                                               SourceLocation>>
    DeviceCallGraph;

/// Diagnostic builder for CUDA/OpenMP devices errors which may or may not be
/// deferred.
///
/// In CUDA, there exist constructs (e.g. variable-length arrays, try/catch)
/// which are not allowed to appear inside __device__ functions and are
/// allowed to appear in __host__ __device__ functions only if the host+device
/// function is never codegen'ed.
///
/// To handle this, we use the notion of "deferred diagnostics", where we
/// attach a diagnostic to a FunctionDecl that's emitted iff it's codegen'ed.
///
/// This class lets you emit either a regular diagnostic, a deferred
/// diagnostic, or no diagnostic at all, according to an argument you pass to
/// its constructor, thus simplifying the process of creating these "maybe
/// deferred" diagnostics.
class DeviceDiagBuilder {
public:
  enum Kind {
    /// Emit no diagnostics.
    K_Nop,
    /// Emit the diagnostic immediately (i.e., behave like Sema::Diag()).
    K_Immediate,
    /// Emit the diagnostic immediately, and, if it's a warning or error, also
    /// emit a call stack showing how this function can be reached by an a
    /// priori known-emitted function.
    K_ImmediateWithCallStack,
    /// Create a deferred diagnostic, which is emitted only if the function
    /// it's attached to is codegen'ed.  Also emit a call stack as with
    /// K_ImmediateWithCallStack.
    K_Deferred
  };

  DeviceDiagBuilder(Kind K, SourceLocation Loc, unsigned DiagID,
                    FunctionDecl *Fn, Sema &S);
  DeviceDiagBuilder(DeviceDiagBuilder &&D);
  DeviceDiagBuilder(const DeviceDiagBuilder &) = default;
  ~DeviceDiagBuilder();

  /// Convertible to bool: True if we immediately emitted an error, false if
  /// we didn't emit an error or we created a deferred error.
  ///
  /// Example usage:
  ///
  ///   if (DeviceDiagBuilder(...) << foo << bar)
  ///     return ExprError();
  ///
  /// But see CUDADiagIfDeviceCode() and CUDADiagIfHostCode() -- you probably
  /// want to use these instead of creating a DeviceDiagBuilder yourself.
  operator bool() const { return ImmediateDiag.hasValue(); }

  template <typename T>
  friend const DeviceDiagBuilder &operator<<(const DeviceDiagBuilder &Diag,
                                             const T &Value) {
    if (Diag.ImmediateDiag.hasValue())
      *Diag.ImmediateDiag << Value;
    else if (Diag.PartialDiagId.hasValue())
      Diag.S.DeviceDeferredDiags[Diag.Fn][*Diag.PartialDiagId].second
          << Value;
    return Diag;
  }

private:
  Sema &S;
  SourceLocation Loc;
  unsigned DiagID;
  FunctionDecl *Fn;
  bool ShowCallStack;

  // Invariant: At most one of these Optionals has a value.
  // FIXME: Switch these to a Variant once that exists.
  llvm::Optional<SemaDiagnosticBuilder> ImmediateDiag;
  llvm::Optional<unsigned> PartialDiagId;
};

/// Indicate that this function (and thus everything it transtively calls)
/// will be codegen'ed, and emit any deferred diagnostics on this function and
/// its (transitive) callees.
void markKnownEmitted(
    Sema &S, FunctionDecl *OrigCaller, FunctionDecl *OrigCallee,
    SourceLocation OrigLoc,
    const llvm::function_ref<bool(Sema &, FunctionDecl *)> IsKnownEmitted);

/// Creates a DeviceDiagBuilder that emits the diagnostic if the current context
/// is "used as device code".
///
/// - If CurContext is a __host__ function, does not emit any diagnostics.
/// - If CurContext is a __device__ or __global__ function, emits the
///   diagnostics immediately.
/// - If CurContext is a __host__ __device__ function and we are compiling for
///   the device, creates a diagnostic which is emitted if and when we realize
///   that the function will be codegen'ed.
///
/// Example usage:
///
///  // Variable-length arrays are not allowed in CUDA device code.
///  if (CUDADiagIfDeviceCode(Loc, diag::err_cuda_vla) << CurrentCUDATarget())
///    return ExprError();
///  // Otherwise, continue parsing as normal.
DeviceDiagBuilder CUDADiagIfDeviceCode(SourceLocation Loc, unsigned DiagID);

/// Creates a DeviceDiagBuilder that emits the diagnostic if the current context
/// is "used as host code".
///
/// Same as CUDADiagIfDeviceCode, with "host" and "device" switched.
DeviceDiagBuilder CUDADiagIfHostCode(SourceLocation Loc, unsigned DiagID);

/// Creates a DeviceDiagBuilder that emits the diagnostic if the current
/// context is "used as device code".
///
/// - If CurContext is a `declare target` function or it is known that the
/// function is emitted for the device, emits the diagnostics immediately.
/// - If CurContext is a non-`declare target` function and we are compiling
///   for the device, creates a diagnostic which is emitted if and when we
///   realize that the function will be codegen'ed.
///
/// Example usage:
///
///  // Variable-length arrays are not allowed in NVPTX device code.
///  if (diagIfOpenMPDeviceCode(Loc, diag::err_vla_unsupported))
///    return ExprError();
///  // Otherwise, continue parsing as normal.
DeviceDiagBuilder diagIfOpenMPDeviceCode(SourceLocation Loc, unsigned DiagID);

DeviceDiagBuilder targetDiag(SourceLocation Loc, unsigned DiagID);

enum CUDAFunctionTarget {
  CFT_Device,
  CFT_Global,
  CFT_Host,
  CFT_HostDevice,
  CFT_InvalidTarget
};

/// Determines whether the given function is a CUDA device/host/kernel/etc.
/// function.
///
/// Use this rather than examining the function's attributes yourself -- you
/// will get it wrong.  Returns CFT_Host if D is null.
CUDAFunctionTarget IdentifyCUDATarget(const FunctionDecl *D,
                                      bool IgnoreImplicitHDAttr = false);
CUDAFunctionTarget IdentifyCUDATarget(const ParsedAttributesView &Attrs);

/// Gets the CUDA target for the current context.
CUDAFunctionTarget CurrentCUDATarget() {
  return IdentifyCUDATarget(dyn_cast<FunctionDecl>(CurContext));
}

// CUDA function call preference. Must be ordered numerically from
// worst to best.
enum CUDAFunctionPreference {
  CFP_Never,      // Invalid caller/callee combination.
  CFP_WrongSide,  // Calls from host-device to host or device
                  // function that do not match current compilation
                  // mode.
  CFP_HostDevice, // Any calls to host/device functions.
  CFP_SameSide,   // Calls from host-device to host or device
                  // function matching current compilation mode.
  CFP_Native,     // host-to-host or device-to-device calls.
};

/// Identifies relative preference of a given Caller/Callee
/// combination, based on their host/device attributes.
/// \param Caller function which needs address of \p Callee.
///               nullptr in case of global context.
/// \param Callee target function
///
/// \returns preference value for particular Caller/Callee combination.
CUDAFunctionPreference IdentifyCUDAPreference(const FunctionDecl *Caller,
                                              const FunctionDecl *Callee);

/// Determines whether Caller may invoke Callee, based on their CUDA
/// host/device attributes.  Returns false if the call is not allowed.
///
/// Note: Will return true for CFP_WrongSide calls.  These may appear in
/// semantically correct CUDA programs, but only if they're never codegen'ed.
bool IsAllowedCUDACall(const FunctionDecl *Caller,
                       const FunctionDecl *Callee) {
  return IdentifyCUDAPreference(Caller, Callee) != CFP_Never;
}

/// May add implicit CUDAHostAttr and CUDADeviceAttr attributes to FD,
/// depending on FD and the current compilation settings.
void maybeAddCUDAHostDeviceAttrs(FunctionDecl *FD,
                                 const LookupResult &Previous);

10463public:
/// Check whether we're allowed to call Callee from the current context.
///
/// - If the call is never allowed in a semantically-correct program
///   (CFP_Never), emits an error and returns false.
///
/// - If the call is allowed in semantically-correct programs, but only if
///   it's never codegen'ed (CFP_WrongSide), creates a deferred diagnostic to
///   be emitted if and when the caller is codegen'ed, and returns true.
///
///   Will only create deferred diagnostics for a given SourceLocation once,
///   so you can safely call this multiple times without generating duplicate
///   deferred errors.
///
/// - Otherwise, returns true without emitting any diagnostics.
bool CheckCUDACall(SourceLocation Loc, FunctionDecl *Callee);

/// Set __device__ or __host__ __device__ attributes on the given lambda
/// operator() method.
///
/// CUDA lambdas declared inside __device__ or __global__ functions inherit
/// the __device__ attribute.  Similarly, lambdas inside __host__ __device__
/// functions become __host__ __device__ themselves.
void CUDASetLambdaAttrs(CXXMethodDecl *Method);

/// Finds a function in \p Matches with highest calling priority
/// from \p Caller context and erases all functions with lower
/// calling priority.
void EraseUnwantedCUDAMatches(
    const FunctionDecl *Caller,
    SmallVectorImpl<std::pair<DeclAccessPair, FunctionDecl *>> &Matches);

/// Given a implicit special member, infer its CUDA target from the
/// calls it needs to make to underlying base/field special members.
/// \param ClassDecl the class for which the member is being created.
/// \param CSM the kind of special member.
/// \param MemberDecl the special member itself.
/// \param ConstRHS true if this is a copy operation with a const object on
///        its RHS.
/// \param Diagnose true if this call should emit diagnostics.
/// \return true if there was an error inferring.
/// The result of this call is implicit CUDA target attribute(s) attached to
/// the member declaration.
bool inferCUDATargetForImplicitSpecialMember(CXXRecordDecl *ClassDecl,
                                             CXXSpecialMember CSM,
                                             CXXMethodDecl *MemberDecl,
                                             bool ConstRHS,
                                             bool Diagnose);

/// \return true if \p CD can be considered empty according to CUDA
/// (E.2.3.1 in CUDA 7.5 Programming guide).
bool isEmptyCudaConstructor(SourceLocation Loc, CXXConstructorDecl *CD);
bool isEmptyCudaDestructor(SourceLocation Loc, CXXDestructorDecl *CD);

// \brief Checks that initializers of \p Var satisfy CUDA restrictions. In
// case of error emits appropriate diagnostic and invalidates \p Var.
//
// \details CUDA allows only empty constructors as initializers for global
// variables (see E.2.3.1, CUDA 7.5). The same restriction also applies to all
// __shared__ variables whether they are local or not (they all are implicitly
// static in CUDA). One exception is that CUDA allows constant initializers
// for __constant__ and __device__ variables.
void checkAllowedCUDAInitializer(VarDecl *VD);

/// Check whether NewFD is a valid overload for CUDA. Emits
/// diagnostics and invalidates NewFD if not.
void checkCUDATargetOverload(FunctionDecl *NewFD,
                             const LookupResult &Previous);
/// Copies target attributes from the template TD to the function FD.
void inheritCUDATargetAttrs(FunctionDecl *FD, const FunctionTemplateDecl &TD);

/// Returns the name of the launch configuration function.  This is the name
/// of the function that will be called to configure kernel call, with the
/// parameters specified via <<<>>>.
std::string getCudaConfigureFuncName() const;

/// \name Code completion
//@{
/// Describes the context in which code completion occurs.
enum ParserCompletionContext {
  /// Code completion occurs at top-level or namespace context.
  PCC_Namespace,
  /// Code completion occurs within a class, struct, or union.
  PCC_Class,
  /// Code completion occurs within an Objective-C interface, protocol,
  /// or category.
  PCC_ObjCInterface,
  /// Code completion occurs within an Objective-C implementation or
  /// category implementation
  PCC_ObjCImplementation,
  /// Code completion occurs within the list of instance variables
  /// in an Objective-C interface, protocol, category, or implementation.
  PCC_ObjCInstanceVariableList,
  /// Code completion occurs following one or more template
  /// headers.
  PCC_Template,
  /// Code completion occurs following one or more template
  /// headers within a class.
  PCC_MemberTemplate,
  /// Code completion occurs within an expression.
  PCC_Expression,
  /// Code completion occurs within a statement, which may
  /// also be an expression or a declaration.
  PCC_Statement,
  /// Code completion occurs at the beginning of the
  /// initialization statement (or expression) in a for loop.
  PCC_ForInit,
  /// Code completion occurs within the condition of an if,
  /// while, switch, or for statement.
  PCC_Condition,
  /// Code completion occurs within the body of a function on a
  /// recovery path, where we do not have a specific handle on our position
  /// in the grammar.
  PCC_RecoveryInFunction,
  /// Code completion occurs where only a type is permitted.
  PCC_Type,
  /// Code completion occurs in a parenthesized expression, which
  /// might also be a type cast.
  PCC_ParenthesizedExpression,
  /// Code completion occurs within a sequence of declaration
  /// specifiers within a function, method, or block.
  PCC_LocalDeclarationSpecifiers
};

void CodeCompleteModuleImport(SourceLocation ImportLoc, ModuleIdPath Path);
void CodeCompleteOrdinaryName(Scope *S,
                              ParserCompletionContext CompletionContext);
void CodeCompleteDeclSpec(Scope *S, DeclSpec &DS,
                          bool AllowNonIdentifiers,
                          bool AllowNestedNameSpecifiers);

struct CodeCompleteExpressionData;
void CodeCompleteExpression(Scope *S,
                            const CodeCompleteExpressionData &Data);
void CodeCompleteExpression(Scope *S, QualType PreferredType,
                            bool IsParenthesized = false);
void CodeCompleteMemberReferenceExpr(Scope *S, Expr *Base, Expr *OtherOpBase,
                                     SourceLocation OpLoc, bool IsArrow,
                                     bool IsBaseExprStatement,
                                     QualType PreferredType);
void CodeCompletePostfixExpression(Scope *S, ExprResult LHS,
                                   QualType PreferredType);
void CodeCompleteTag(Scope *S, unsigned TagSpec);
void CodeCompleteTypeQualifiers(DeclSpec &DS);
void CodeCompleteFunctionQualifiers(DeclSpec &DS, Declarator &D,
                                    const VirtSpecifiers *VS = nullptr);
void CodeCompleteBracketDeclarator(Scope *S);
void CodeCompleteCase(Scope *S);
/// Reports signatures for a call to CodeCompleteConsumer and returns the
/// preferred type for the current argument. Returned type can be null.
QualType ProduceCallSignatureHelp(Scope *S, Expr *Fn, ArrayRef<Expr *> Args,
                                  SourceLocation OpenParLoc);
QualType ProduceConstructorSignatureHelp(Scope *S, QualType Type,
                                         SourceLocation Loc,
                                         ArrayRef<Expr *> Args,
                                         SourceLocation OpenParLoc);
QualType ProduceCtorInitMemberSignatureHelp(Scope *S, Decl *ConstructorDecl,
                                            CXXScopeSpec SS,
                                            ParsedType TemplateTypeTy,
                                            ArrayRef<Expr *> ArgExprs,
                                            IdentifierInfo *II,
                                            SourceLocation OpenParLoc);
void CodeCompleteInitializer(Scope *S, Decl *D);
void CodeCompleteAfterIf(Scope *S);

void CodeCompleteQualifiedId(Scope *S, CXXScopeSpec &SS,
                             bool EnteringContext, QualType BaseType);
void CodeCompleteUsing(Scope *S);
void CodeCompleteUsingDirective(Scope *S);
void CodeCompleteNamespaceDecl(Scope *S);
void CodeCompleteNamespaceAliasDecl(Scope *S);
void CodeCompleteOperatorName(Scope *S);
void CodeCompleteConstructorInitializer(
                              Decl *Constructor,
                              ArrayRef<CXXCtorInitializer *> Initializers);

void CodeCompleteLambdaIntroducer(Scope *S, LambdaIntroducer &Intro,
                                  bool AfterAmpersand);

void CodeCompleteObjCAtDirective(Scope *S);
void CodeCompleteObjCAtVisibility(Scope *S);
void CodeCompleteObjCAtStatement(Scope *S);
void CodeCompleteObjCAtExpression(Scope *S);
void CodeCompleteObjCPropertyFlags(Scope *S, ObjCDeclSpec &ODS);
void CodeCompleteObjCPropertyGetter(Scope *S);
void CodeCompleteObjCPropertySetter(Scope *S);
void CodeCompleteObjCPassingType(Scope *S, ObjCDeclSpec &DS,
                                 bool IsParameter);
void CodeCompleteObjCMessageReceiver(Scope *S);
void CodeCompleteObjCSuperMessage(Scope *S, SourceLocation SuperLoc,
                                  ArrayRef<IdentifierInfo *> SelIdents,
                                  bool AtArgumentExpression);
void CodeCompleteObjCClassMessage(Scope *S, ParsedType Receiver,
                                  ArrayRef<IdentifierInfo *> SelIdents,
                                  bool AtArgumentExpression,
                                  bool IsSuper = false);
void CodeCompleteObjCInstanceMessage(Scope *S, Expr *Receiver,
                                     ArrayRef<IdentifierInfo *> SelIdents,
                                     bool AtArgumentExpression,
                                     ObjCInterfaceDecl *Super = nullptr);
void CodeCompleteObjCForCollection(Scope *S,
                                   DeclGroupPtrTy IterationVar);
void CodeCompleteObjCSelector(Scope *S,
                              ArrayRef<IdentifierInfo *> SelIdents);
void CodeCompleteObjCProtocolReferences(
                                       ArrayRef<IdentifierLocPair> Protocols);
void CodeCompleteObjCProtocolDecl(Scope *S);
void CodeCompleteObjCInterfaceDecl(Scope *S);
void CodeCompleteObjCSuperclass(Scope *S,
                                IdentifierInfo *ClassName,
                                SourceLocation ClassNameLoc);
void CodeCompleteObjCImplementationDecl(Scope *S);
void CodeCompleteObjCInterfaceCategory(Scope *S,
                                       IdentifierInfo *ClassName,
                                       SourceLocation ClassNameLoc);
void CodeCompleteObjCImplementationCategory(Scope *S,
                                            IdentifierInfo *ClassName,
                                            SourceLocation ClassNameLoc);
void CodeCompleteObjCPropertyDefinition(Scope *S);
void CodeCompleteObjCPropertySynthesizeIvar(Scope *S,
                                            IdentifierInfo *PropertyName);
void CodeCompleteObjCMethodDecl(Scope *S, Optional<bool> IsInstanceMethod,
                                ParsedType ReturnType);
void CodeCompleteObjCMethodDeclSelector(Scope *S,
                                        bool IsInstanceMethod,
                                        bool AtParameterName,
                                        ParsedType ReturnType,
                                        ArrayRef<IdentifierInfo *> SelIdents);
void CodeCompleteObjCClassPropertyRefExpr(Scope *S, IdentifierInfo &ClassName,
                                          SourceLocation ClassNameLoc,
                                          bool IsBaseExprStatement);
void CodeCompletePreprocessorDirective(bool InConditional);
void CodeCompleteInPreprocessorConditionalExclusion(Scope *S);
void CodeCompletePreprocessorMacroName(bool IsDefinition);
void CodeCompletePreprocessorExpression();
void CodeCompletePreprocessorMacroArgument(Scope *S,
                                           IdentifierInfo *Macro,
                                           MacroInfo *MacroInfo,
                                           unsigned Argument);
void CodeCompleteIncludedFile(llvm::StringRef Dir, bool IsAngled);
void CodeCompleteNaturalLanguage();
void CodeCompleteAvailabilityPlatformName();
void GatherGlobalCodeCompletions(CodeCompletionAllocator &Allocator,
                                 CodeCompletionTUInfo &CCTUInfo,
                SmallVectorImpl<CodeCompletionResult> &Results);
//@}

//===--------------------------------------------------------------------===//
// Extra semantic analysis beyond the C type system

10713public:
SourceLocation getLocationOfStringLiteralByte(const StringLiteral *SL,
                                              unsigned ByteNo) const;

10717private:
void CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
                      const ArraySubscriptExpr *ASE=nullptr,
                      bool AllowOnePastEnd=true, bool IndexNegated=false);
void CheckArrayAccess(const Expr *E);
// Used to grab the relevant information from a FormatAttr and a
// FunctionDeclaration.
struct FormatStringInfo {
  unsigned FormatIdx;
  unsigned FirstDataArg;
  bool HasVAListArg;
};

static bool getFormatStringInfo(const FormatAttr *Format, bool IsCXXMember,
                                FormatStringInfo *FSI);
bool CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall,
                       const FunctionProtoType *Proto);
bool CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation loc,
                         ArrayRef<const Expr *> Args);
bool CheckPointerCall(NamedDecl *NDecl, CallExpr *TheCall,
                      const FunctionProtoType *Proto);
bool CheckOtherCall(CallExpr *TheCall, const FunctionProtoType *Proto);
void CheckConstructorCall(FunctionDecl *FDecl,
                          ArrayRef<const Expr *> Args,
                          const FunctionProtoType *Proto,
                          SourceLocation Loc);

void checkCall(NamedDecl *FDecl, const FunctionProtoType *Proto,
               const Expr *ThisArg, ArrayRef<const Expr *> Args,
               bool IsMemberFunction, SourceLocation Loc, SourceRange Range,
               VariadicCallType CallType);

bool CheckObjCString(Expr *Arg);
ExprResult CheckOSLogFormatStringArg(Expr *Arg);

ExprResult CheckBuiltinFunctionCall(FunctionDecl *FDecl,
                                    unsigned BuiltinID, CallExpr *TheCall);
void checkFortifiedBuiltinMemoryFunction(FunctionDecl *FD, CallExpr *TheCall);

bool CheckARMBuiltinExclusiveCall(unsigned BuiltinID, CallExpr *TheCall,
                                  unsigned MaxWidth);
bool CheckNeonBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckARMBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);

bool CheckAArch64BuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckHexagonBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckHexagonBuiltinCpu(unsigned BuiltinID, CallExpr *TheCall);
bool CheckHexagonBuiltinArgument(unsigned BuiltinID, CallExpr *TheCall);
bool CheckMipsBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckSystemZBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckX86BuiltinRoundingOrSAE(unsigned BuiltinID, CallExpr *TheCall);
bool CheckX86BuiltinGatherScatterScale(unsigned BuiltinID, CallExpr *TheCall);
bool CheckX86BuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckPPCBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);

bool SemaBuiltinVAStart(unsigned BuiltinID, CallExpr *TheCall);
bool SemaBuiltinVAStartARMMicrosoft(CallExpr *Call);
bool SemaBuiltinUnorderedCompare(CallExpr *TheCall);
bool SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs);
bool SemaBuiltinVSX(CallExpr *TheCall);
bool SemaBuiltinOSLogFormat(CallExpr *TheCall);

10779public:
// Used by C++ template instantiation.
ExprResult SemaBuiltinShuffleVector(CallExpr *TheCall);
ExprResult SemaConvertVectorExpr(Expr *E, TypeSourceInfo *TInfo,
                                 SourceLocation BuiltinLoc,
                                 SourceLocation RParenLoc);

10786private:
bool SemaBuiltinPrefetch(CallExpr *TheCall);
bool SemaBuiltinAllocaWithAlign(CallExpr *TheCall);
bool SemaBuiltinAssume(CallExpr *TheCall);
bool SemaBuiltinAssumeAligned(CallExpr *TheCall);
bool SemaBuiltinLongjmp(CallExpr *TheCall);
bool SemaBuiltinSetjmp(CallExpr *TheCall);
ExprResult SemaBuiltinAtomicOverloaded(ExprResult TheCallResult);
ExprResult SemaBuiltinNontemporalOverloaded(ExprResult TheCallResult);
ExprResult SemaAtomicOpsOverloaded(ExprResult TheCallResult,
                                   AtomicExpr::AtomicOp Op);
ExprResult SemaBuiltinOperatorNewDeleteOverloaded(ExprResult TheCallResult,
                                                  bool IsDelete);
bool SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum,
                            llvm::APSInt &Result);
bool SemaBuiltinConstantArgRange(CallExpr *TheCall, int ArgNum, int Low,
                                 int High, bool RangeIsError = true);
bool SemaBuiltinConstantArgMultiple(CallExpr *TheCall, int ArgNum,
                                    unsigned Multiple);
bool SemaBuiltinARMSpecialReg(unsigned BuiltinID, CallExpr *TheCall,
                              int ArgNum, unsigned ExpectedFieldNum,
                              bool AllowName);
bool SemaBuiltinARMMemoryTaggingCall(unsigned BuiltinID, CallExpr *TheCall);
10809public:
enum FormatStringType {
  FST_Scanf,
  FST_Printf,
  FST_NSString,
  FST_Strftime,
  FST_Strfmon,
  FST_Kprintf,
  FST_FreeBSDKPrintf,
  FST_OSTrace,
  FST_OSLog,
  FST_Unknown
};
static FormatStringType GetFormatStringType(const FormatAttr *Format);

bool FormatStringHasSArg(const StringLiteral *FExpr);

static bool GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx);

10828private:
bool CheckFormatArguments(const FormatAttr *Format,
                          ArrayRef<const Expr *> Args,
                          bool IsCXXMember,
                          VariadicCallType CallType,
                          SourceLocation Loc, SourceRange Range,
                          llvm::SmallBitVector &CheckedVarArgs);
bool CheckFormatArguments(ArrayRef<const Expr *> Args,
                          bool HasVAListArg, unsigned format_idx,
                          unsigned firstDataArg, FormatStringType Type,
                          VariadicCallType CallType,
                          SourceLocation Loc, SourceRange range,
                          llvm::SmallBitVector &CheckedVarArgs);

void CheckAbsoluteValueFunction(const CallExpr *Call,
                                const FunctionDecl *FDecl);

void CheckMaxUnsignedZero(const CallExpr *Call, const FunctionDecl *FDecl);

void CheckMemaccessArguments(const CallExpr *Call,
                             unsigned BId,
                             IdentifierInfo *FnName);

void CheckStrlcpycatArguments(const CallExpr *Call,
                              IdentifierInfo *FnName);

void CheckStrncatArguments(const CallExpr *Call,
                           IdentifierInfo *FnName);

void CheckReturnValExpr(Expr *RetValExp, QualType lhsType,
                        SourceLocation ReturnLoc,
                        bool isObjCMethod = false,
                        const AttrVec *Attrs = nullptr,
                        const FunctionDecl *FD = nullptr);

10863public:
void CheckFloatComparison(SourceLocation Loc, Expr *LHS, Expr *RHS);

10866private:
void CheckImplicitConversions(Expr *E, SourceLocation CC = SourceLocation());
void CheckBoolLikeConversion(Expr *E, SourceLocation CC);
void CheckForIntOverflow(Expr *E);
void CheckUnsequencedOperations(Expr *E);

/// Perform semantic checks on a completed expression. This will either
/// be a full-expression or a default argument expression.
void CheckCompletedExpr(Expr *E, SourceLocation CheckLoc = SourceLocation(),
                        bool IsConstexpr = false);

void CheckBitFieldInitialization(SourceLocation InitLoc, FieldDecl *Field,
                                 Expr *Init);

/// Check if there is a field shadowing.
void CheckShadowInheritedFields(const SourceLocation &Loc,
                                DeclarationName FieldName,
                                const CXXRecordDecl *RD,
                                bool DeclIsField = true);

/// Check if the given expression contains 'break' or 'continue'
/// statement that produces control flow different from GCC.
void CheckBreakContinueBinding(Expr *E);

/// Check whether receiver is mutable ObjC container which
/// attempts to add itself into the container
void CheckObjCCircularContainer(ObjCMessageExpr *Message);

void AnalyzeDeleteExprMismatch(const CXXDeleteExpr *DE);
void AnalyzeDeleteExprMismatch(FieldDecl *Field, SourceLocation DeleteLoc,
                               bool DeleteWasArrayForm);
10897public:
/// Register a magic integral constant to be used as a type tag.
void RegisterTypeTagForDatatype(const IdentifierInfo *ArgumentKind,
                                uint64_t MagicValue, QualType Type,
                                bool LayoutCompatible, bool MustBeNull);

struct TypeTagData {
  TypeTagData() {}

  TypeTagData(QualType Type, bool LayoutCompatible, bool MustBeNull) :
      Type(Type), LayoutCompatible(LayoutCompatible),
      MustBeNull(MustBeNull)
  {}

  QualType Type;

  /// If true, \c Type should be compared with other expression's types for
  /// layout-compatibility.
  unsigned LayoutCompatible : 1;
  unsigned MustBeNull : 1;
};

/// A pair of ArgumentKind identifier and magic value.  This uniquely
/// identifies the magic value.
typedef std::pair<const IdentifierInfo *, uint64_t> TypeTagMagicValue;

10923private:
/// A map from magic value to type information.
std::unique_ptr<llvm::DenseMap<TypeTagMagicValue, TypeTagData>>
    TypeTagForDatatypeMagicValues;

/// Peform checks on a call of a function with argument_with_type_tag
/// or pointer_with_type_tag attributes.
void CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
                              const ArrayRef<const Expr *> ExprArgs,
                              SourceLocation CallSiteLoc);

/// Check if we are taking the address of a packed field
/// as this may be a problem if the pointer value is dereferenced.
void CheckAddressOfPackedMember(Expr *rhs);

/// The parser's current scope.
///
/// The parser maintains this state here.
Scope *CurScope;

mutable IdentifierInfo *Ident_super;
mutable IdentifierInfo *Ident___float128;

/// Nullability type specifiers.
IdentifierInfo *Ident__Nonnull = nullptr;
IdentifierInfo *Ident__Nullable = nullptr;
IdentifierInfo *Ident__Null_unspecified = nullptr;

IdentifierInfo *Ident_NSError = nullptr;

/// The handler for the FileChanged preprocessor events.
///
/// Used for diagnostics that implement custom semantic analysis for #include
/// directives, like -Wpragma-pack.
sema::SemaPPCallbacks *SemaPPCallbackHandler;

10959protected:
friend class Parser;
friend class InitializationSequence;
friend class ASTReader;
friend class ASTDeclReader;
friend class ASTWriter;

10966public:
/// Retrieve the keyword associated
IdentifierInfo *getNullabilityKeyword(NullabilityKind nullability);

/// The struct behind the CFErrorRef pointer.
RecordDecl *CFError = nullptr;

/// Retrieve the identifier "NSError".
IdentifierInfo *getNSErrorIdent();

/// Retrieve the parser's current scope.
///
/// This routine must only be used when it is certain that semantic analysis
/// and the parser are in precisely the same context, which is not the case
/// when, e.g., we are performing any kind of template instantiation.
/// Therefore, the only safe places to use this scope are in the parser
/// itself and in routines directly invoked from the parser and *never* from
/// template substitution or instantiation.
Scope *getCurScope() const { return CurScope; }

void incrementMSManglingNumber() const {
  return CurScope->incrementMSManglingNumber();
}

IdentifierInfo *getSuperIdentifier() const;
IdentifierInfo *getFloat128Identifier() const;

Decl *getObjCDeclContext() const;

DeclContext *getCurLexicalContext() const {
  return OriginalLexicalContext ? OriginalLexicalContext : CurContext;
}

const DeclContext *getCurObjCLexicalContext() const {
  const DeclContext *DC = getCurLexicalContext();
  // A category implicitly has the attribute of the interface.
  if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(DC))
    DC = CatD->getClassInterface();
  return DC;
}

/// To be used for checking whether the arguments being passed to
/// function exceeds the number of parameters expected for it.
static bool TooManyArguments(size_t NumParams, size_t NumArgs,
                             bool PartialOverloading = false) {
  // We check whether we're just after a comma in code-completion.
  if (NumArgs > 0 && PartialOverloading)
    return NumArgs + 1 > NumParams; // If so, we view as an extra argument.
  return NumArgs > NumParams;
}

// Emitting members of dllexported classes is delayed until the class
// (including field initializers) is fully parsed.
SmallVector<CXXRecordDecl*, 4> DelayedDllExportClasses;

11021private:
class SavePendingParsedClassStateRAII {
public:
  SavePendingParsedClassStateRAII(Sema &S) : S(S) { swapSavedState(); }

  ~SavePendingParsedClassStateRAII() {
    assert(S.DelayedOverridingExceptionSpecChecks.empty() &&((S.DelayedOverridingExceptionSpecChecks.empty() && "there shouldn't be any pending delayed exception spec checks"
) ? static_cast<void> (0) : __assert_fail ("S.DelayedOverridingExceptionSpecChecks.empty() && \"there shouldn't be any pending delayed exception spec checks\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 11028, __PRETTY_FUNCTION__))
           "there shouldn't be any pending delayed exception spec checks")((S.DelayedOverridingExceptionSpecChecks.empty() && "there shouldn't be any pending delayed exception spec checks"
) ? static_cast<void> (0) : __assert_fail ("S.DelayedOverridingExceptionSpecChecks.empty() && \"there shouldn't be any pending delayed exception spec checks\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 11028, __PRETTY_FUNCTION__));
    assert(S.DelayedEquivalentExceptionSpecChecks.empty() &&((S.DelayedEquivalentExceptionSpecChecks.empty() && "there shouldn't be any pending delayed exception spec checks"
) ? static_cast<void> (0) : __assert_fail ("S.DelayedEquivalentExceptionSpecChecks.empty() && \"there shouldn't be any pending delayed exception spec checks\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 11030, __PRETTY_FUNCTION__))
           "there shouldn't be any pending delayed exception spec checks")((S.DelayedEquivalentExceptionSpecChecks.empty() && "there shouldn't be any pending delayed exception spec checks"
) ? static_cast<void> (0) : __assert_fail ("S.DelayedEquivalentExceptionSpecChecks.empty() && \"there shouldn't be any pending delayed exception spec checks\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 11030, __PRETTY_FUNCTION__));
    assert(S.DelayedDllExportClasses.empty() &&((S.DelayedDllExportClasses.empty() && "there shouldn't be any pending delayed DLL export classes"
) ? static_cast<void> (0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"there shouldn't be any pending delayed DLL export classes\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 11032, __PRETTY_FUNCTION__))
           "there shouldn't be any pending delayed DLL export classes")((S.DelayedDllExportClasses.empty() && "there shouldn't be any pending delayed DLL export classes"
) ? static_cast<void> (0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"there shouldn't be any pending delayed DLL export classes\""
, "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/include/clang/Sema/Sema.h"
, 11032, __PRETTY_FUNCTION__));
    swapSavedState();
  }

private:
  Sema &S;
  decltype(DelayedOverridingExceptionSpecChecks)
      SavedOverridingExceptionSpecChecks;
  decltype(DelayedEquivalentExceptionSpecChecks)
      SavedEquivalentExceptionSpecChecks;
  decltype(DelayedDllExportClasses) SavedDllExportClasses;

  void swapSavedState() {
    SavedOverridingExceptionSpecChecks.swap(
        S.DelayedOverridingExceptionSpecChecks);
    SavedEquivalentExceptionSpecChecks.swap(
        S.DelayedEquivalentExceptionSpecChecks);
    SavedDllExportClasses.swap(S.DelayedDllExportClasses);
  }
};

/// Helper class that collects misaligned member designations and
/// their location info for delayed diagnostics.
struct MisalignedMember {
  Expr *E;
  RecordDecl *RD;
  ValueDecl *MD;
  CharUnits Alignment;

  MisalignedMember() : E(), RD(), MD(), Alignment() {}
  MisalignedMember(Expr *E, RecordDecl *RD, ValueDecl *MD,
                   CharUnits Alignment)
      : E(E), RD(RD), MD(MD), Alignment(Alignment) {}
  explicit MisalignedMember(Expr *E)
      : MisalignedMember(E, nullptr, nullptr, CharUnits()) {}

  bool operator==(const MisalignedMember &m) { return this->E == m.E; }
};
/// Small set of gathered accesses to potentially misaligned members
/// due to the packed attribute.
SmallVector<MisalignedMember, 4> MisalignedMembers;

/// Adds an expression to the set of gathered misaligned members.
void AddPotentialMisalignedMembers(Expr *E, RecordDecl *RD, ValueDecl *MD,
                                   CharUnits Alignment);

11078public:
/// Diagnoses the current set of gathered accesses. This typically
/// happens at full expression level. The set is cleared after emitting the
/// diagnostics.
void DiagnoseMisalignedMembers();

/// This function checks if the expression is in the sef of potentially
/// misaligned members and it is converted to some pointer type T with lower
/// or equal alignment requirements. If so it removes it. This is used when
/// we do not want to diagnose such misaligned access (e.g. in conversions to
/// void*).
void DiscardMisalignedMemberAddress(const Type *T, Expr *E);

/// This function calls Action when it determines that E designates a
/// misaligned member due to the packed attribute. This is used to emit
/// local diagnostics like in reference binding.
void RefersToMemberWithReducedAlignment(
    Expr *E,
    llvm::function_ref<void(Expr *, RecordDecl *, FieldDecl *, CharUnits)>
        Action);

/// Describes the reason a calling convention specification was ignored, used
/// for diagnostics.
enum class CallingConventionIgnoredReason {
  ForThisTarget = 0,
  VariadicFunction,
  ConstructorDestructor,
  BuiltinFunction
};
11107};

11109/// RAII object that enters a new expression evaluation context.
11110class EnterExpressionEvaluationContext {
Sema &Actions;
bool Entered = true;

11114public:
EnterExpressionEvaluationContext(
    Sema &Actions, Sema::ExpressionEvaluationContext NewContext,
    Decl *LambdaContextDecl = nullptr,
    Sema::ExpressionEvaluationContextRecord::ExpressionKind ExprContext =
        Sema::ExpressionEvaluationContextRecord::EK_Other,
    bool ShouldEnter = true)
    : Actions(Actions), Entered(ShouldEnter) {
  if (Entered)
    Actions.PushExpressionEvaluationContext(NewContext, LambdaContextDecl,
                                            ExprContext);
}
EnterExpressionEvaluationContext(
    Sema &Actions, Sema::ExpressionEvaluationContext NewContext,
    Sema::ReuseLambdaContextDecl_t,
    Sema::ExpressionEvaluationContextRecord::ExpressionKind ExprContext =
        Sema::ExpressionEvaluationContextRecord::EK_Other)
    : Actions(Actions) {
  Actions.PushExpressionEvaluationContext(
      NewContext, Sema::ReuseLambdaContextDecl, ExprContext);
}

enum InitListTag { InitList };
EnterExpressionEvaluationContext(Sema &Actions, InitListTag,
                                 bool ShouldEnter = true)
    : Actions(Actions), Entered(false) {
  // In C++11 onwards, narrowing checks are performed on the contents of
  // braced-init-lists, even when they occur within unevaluated operands.
  // Therefore we still need to instantiate constexpr functions used in such
  // a context.
  if (ShouldEnter && Actions.isUnevaluatedContext() &&
      Actions.getLangOpts().CPlusPlus11) {
    Actions.PushExpressionEvaluationContext(
        Sema::ExpressionEvaluationContext::UnevaluatedList);
    Entered = true;
  }
}

~EnterExpressionEvaluationContext() {
  if (Entered)
    Actions.PopExpressionEvaluationContext();
}
11156};

11158DeductionFailureInfo
11159MakeDeductionFailureInfo(ASTContext &Context, Sema::TemplateDeductionResult TDK,
                       sema::TemplateDeductionInfo &Info);

11162/// Contains a late templated function.
11163/// Will be parsed at the end of the translation unit, used by Sema & Parser.
11164struct LateParsedTemplate {
CachedTokens Toks;
/// The template function declaration to be late parsed.
Decl *D;
11168};
11169} // end namespace clang

11171namespace llvm {
11172// Hash a FunctionDeclAndLoc by looking at both its FunctionDecl and its
11173// SourceLocation.
11174template <> struct DenseMapInfo<clang::Sema::FunctionDeclAndLoc> {
using FunctionDeclAndLoc = clang::Sema::FunctionDeclAndLoc;
using FDBaseInfo = DenseMapInfo<clang::CanonicalDeclPtr<clang::FunctionDecl>>;

static FunctionDeclAndLoc getEmptyKey() {
  return {FDBaseInfo::getEmptyKey(), clang::SourceLocation()};
}

static FunctionDeclAndLoc getTombstoneKey() {
  return {FDBaseInfo::getTombstoneKey(), clang::SourceLocation()};
}

static unsigned getHashValue(const FunctionDeclAndLoc &FDL) {
  return hash_combine(FDBaseInfo::getHashValue(FDL.FD),
                      FDL.Loc.getRawEncoding());
}

static bool isEqual(const FunctionDeclAndLoc &LHS,
                    const FunctionDeclAndLoc &RHS) {
  return LHS.FD == RHS.FD && LHS.Loc == RHS.Loc;
}
11195};
11196} // namespace llvm

11198#endif