clang  3.9.0
ASTCommon.cpp
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1 //===--- ASTCommon.cpp - Common stuff for ASTReader/ASTWriter----*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines common functions that both ASTReader and ASTWriter use.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "ASTCommon.h"
15 #include "clang/AST/DeclCXX.h"
16 #include "clang/AST/DeclObjC.h"
19 #include "llvm/ADT/StringExtras.h"
20 
21 using namespace clang;
22 
23 // Give ASTDeserializationListener's VTable a home.
25 
28  unsigned ID = 0;
29  switch (BT->getKind()) {
30  case BuiltinType::Void:
32  break;
33  case BuiltinType::Bool:
35  break;
36  case BuiltinType::Char_U:
38  break;
39  case BuiltinType::UChar:
41  break;
42  case BuiltinType::UShort:
44  break;
45  case BuiltinType::UInt:
47  break;
48  case BuiltinType::ULong:
50  break;
51  case BuiltinType::ULongLong:
53  break;
54  case BuiltinType::UInt128:
56  break;
57  case BuiltinType::Char_S:
59  break;
60  case BuiltinType::SChar:
62  break;
63  case BuiltinType::WChar_S:
64  case BuiltinType::WChar_U:
66  break;
67  case BuiltinType::Short:
69  break;
70  case BuiltinType::Int:
71  ID = PREDEF_TYPE_INT_ID;
72  break;
73  case BuiltinType::Long:
75  break;
76  case BuiltinType::LongLong:
78  break;
79  case BuiltinType::Int128:
81  break;
82  case BuiltinType::Half:
84  break;
85  case BuiltinType::Float:
87  break;
88  case BuiltinType::Double:
90  break;
91  case BuiltinType::LongDouble:
93  break;
94  case BuiltinType::Float128:
96  break;
97  case BuiltinType::NullPtr:
99  break;
100  case BuiltinType::Char16:
102  break;
103  case BuiltinType::Char32:
105  break;
106  case BuiltinType::Overload:
108  break;
109  case BuiltinType::BoundMember:
111  break;
112  case BuiltinType::PseudoObject:
114  break;
115  case BuiltinType::Dependent:
117  break;
118  case BuiltinType::UnknownAny:
120  break;
121  case BuiltinType::ARCUnbridgedCast:
123  break;
124  case BuiltinType::ObjCId:
125  ID = PREDEF_TYPE_OBJC_ID;
126  break;
127  case BuiltinType::ObjCClass:
129  break;
130  case BuiltinType::ObjCSel:
132  break;
133 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
134  case BuiltinType::Id: \
135  ID = PREDEF_TYPE_##Id##_ID; \
136  break;
137 #include "clang/Basic/OpenCLImageTypes.def"
138  case BuiltinType::OCLSampler:
140  break;
141  case BuiltinType::OCLEvent:
143  break;
144  case BuiltinType::OCLClkEvent:
146  break;
147  case BuiltinType::OCLQueue:
149  break;
150  case BuiltinType::OCLNDRange:
152  break;
153  case BuiltinType::OCLReserveID:
155  break;
156  case BuiltinType::BuiltinFn:
158  break;
159  case BuiltinType::OMPArraySection:
161  break;
162  }
163 
164  return TypeIdx(ID);
165 }
166 
168  unsigned N = Sel.getNumArgs();
169  if (N == 0)
170  ++N;
171  unsigned R = 5381;
172  for (unsigned I = 0; I != N; ++I)
174  R = llvm::HashString(II->getName(), R);
175  return R;
176 }
177 
178 const DeclContext *
180  switch (DC->getDeclKind()) {
181  // These entities may have multiple definitions.
182  case Decl::TranslationUnit:
183  case Decl::ExternCContext:
184  case Decl::Namespace:
185  case Decl::LinkageSpec:
186  return nullptr;
187 
188  // C/C++ tag types can only be defined in one place.
189  case Decl::Enum:
190  case Decl::Record:
191  if (const TagDecl *Def = cast<TagDecl>(DC)->getDefinition())
192  return Def;
193  return nullptr;
194 
195  // FIXME: These can be defined in one place... except special member
196  // functions and out-of-line definitions.
197  case Decl::CXXRecord:
198  case Decl::ClassTemplateSpecialization:
199  case Decl::ClassTemplatePartialSpecialization:
200  return nullptr;
201 
202  // Each function, method, and block declaration is its own DeclContext.
203  case Decl::Function:
204  case Decl::CXXMethod:
205  case Decl::CXXConstructor:
206  case Decl::CXXDestructor:
207  case Decl::CXXConversion:
208  case Decl::ObjCMethod:
209  case Decl::Block:
210  case Decl::Captured:
211  // Objective C categories, category implementations, and class
212  // implementations can only be defined in one place.
213  case Decl::ObjCCategory:
214  case Decl::ObjCCategoryImpl:
215  case Decl::ObjCImplementation:
216  return DC;
217 
218  case Decl::ObjCProtocol:
219  if (const ObjCProtocolDecl *Def
220  = cast<ObjCProtocolDecl>(DC)->getDefinition())
221  return Def;
222  return nullptr;
223 
224  // FIXME: These are defined in one place, but properties in class extensions
225  // end up being back-patched into the main interface. See
226  // Sema::HandlePropertyInClassExtension for the offending code.
227  case Decl::ObjCInterface:
228  return nullptr;
229 
230  default:
231  llvm_unreachable("Unhandled DeclContext in AST reader");
232  }
233 
234  llvm_unreachable("Unhandled decl kind");
235 }
236 
238  switch (static_cast<Decl::Kind>(Kind)) {
239  case Decl::TranslationUnit:
240  case Decl::ExternCContext:
241  // Special case of a "merged" declaration.
242  return true;
243 
244  case Decl::Namespace:
245  case Decl::NamespaceAlias:
246  case Decl::Typedef:
247  case Decl::TypeAlias:
248  case Decl::Enum:
249  case Decl::Record:
250  case Decl::CXXRecord:
251  case Decl::ClassTemplateSpecialization:
252  case Decl::ClassTemplatePartialSpecialization:
253  case Decl::VarTemplateSpecialization:
254  case Decl::VarTemplatePartialSpecialization:
255  case Decl::Function:
256  case Decl::CXXMethod:
257  case Decl::CXXConstructor:
258  case Decl::CXXDestructor:
259  case Decl::CXXConversion:
260  case Decl::UsingShadow:
261  case Decl::ConstructorUsingShadow:
262  case Decl::Var:
263  case Decl::FunctionTemplate:
264  case Decl::ClassTemplate:
265  case Decl::VarTemplate:
266  case Decl::TypeAliasTemplate:
267  case Decl::ObjCProtocol:
268  case Decl::ObjCInterface:
269  case Decl::Empty:
270  return true;
271 
272  // Never redeclarable.
273  case Decl::UsingDirective:
274  case Decl::Label:
275  case Decl::UnresolvedUsingTypename:
276  case Decl::TemplateTypeParm:
277  case Decl::EnumConstant:
278  case Decl::UnresolvedUsingValue:
279  case Decl::IndirectField:
280  case Decl::Field:
281  case Decl::MSProperty:
282  case Decl::ObjCIvar:
283  case Decl::ObjCAtDefsField:
284  case Decl::NonTypeTemplateParm:
285  case Decl::TemplateTemplateParm:
286  case Decl::Using:
287  case Decl::ObjCMethod:
288  case Decl::ObjCCategory:
289  case Decl::ObjCCategoryImpl:
290  case Decl::ObjCImplementation:
291  case Decl::ObjCProperty:
292  case Decl::ObjCCompatibleAlias:
293  case Decl::LinkageSpec:
294  case Decl::ObjCPropertyImpl:
295  case Decl::PragmaComment:
296  case Decl::PragmaDetectMismatch:
297  case Decl::FileScopeAsm:
298  case Decl::AccessSpec:
299  case Decl::Friend:
300  case Decl::FriendTemplate:
301  case Decl::StaticAssert:
302  case Decl::Block:
303  case Decl::Captured:
304  case Decl::ClassScopeFunctionSpecialization:
305  case Decl::Import:
306  case Decl::OMPThreadPrivate:
307  case Decl::OMPCapturedExpr:
308  case Decl::OMPDeclareReduction:
309  case Decl::BuiltinTemplate:
310  return false;
311 
312  // These indirectly derive from Redeclarable<T> but are not actually
313  // redeclarable.
314  case Decl::ImplicitParam:
315  case Decl::ParmVar:
316  case Decl::ObjCTypeParam:
317  return false;
318  }
319 
320  llvm_unreachable("Unhandled declaration kind");
321 }
322 
324  // Friend declarations in dependent contexts aren't anonymous in the usual
325  // sense, but they cannot be found by name lookup in their semantic context
326  // (or indeed in any context), so we treat them as anonymous.
327  //
328  // This doesn't apply to friend tag decls; Sema makes those available to name
329  // lookup in the surrounding context.
330  if (D->getFriendObjectKind() &&
331  D->getLexicalDeclContext()->isDependentContext() && !isa<TagDecl>(D)) {
332  // For function templates and class templates, the template is numbered and
333  // not its pattern.
334  if (auto *FD = dyn_cast<FunctionDecl>(D))
335  return !FD->getDescribedFunctionTemplate();
336  if (auto *RD = dyn_cast<CXXRecordDecl>(D))
337  return !RD->getDescribedClassTemplate();
338  return true;
339  }
340 
341  // Otherwise, we only care about anonymous class members.
342  if (D->getDeclName() || !isa<CXXRecordDecl>(D->getLexicalDeclContext()))
343  return false;
344  return isa<TagDecl>(D) || isa<FieldDecl>(D);
345 }
346 
Kind getKind() const
Definition: Type.h:2060
Smart pointer class that efficiently represents Objective-C method names.
bool isRedeclarableDeclKind(unsigned Kind)
Determine whether the given declaration kind is redeclarable.
Definition: ASTCommon.cpp:237
The (signed) 'long long' type.
Definition: ASTBitCodes.h:740
The 'bool' or '_Bool' type.
Definition: ASTBitCodes.h:714
The 'unknown any' placeholder type.
Definition: ASTBitCodes.h:768
The placeholder type for builtin functions.
Definition: ASTBitCodes.h:782
ARC's unbridged-cast placeholder type.
Definition: ASTBitCodes.h:778
const DeclContext * getDefinitiveDeclContext(const DeclContext *DC)
Retrieve the "definitive" declaration that provides all of the visible entries for the given declarat...
Definition: ASTCommon.cpp:179
One of these records is kept for each identifier that is lexed.
IdentifierInfo * getIdentifierInfoForSlot(unsigned argIndex) const
Retrieve the identifier at a given position in the selector.
The 'char' type, when it is signed.
Definition: ASTBitCodes.h:728
ObjCProtocolDecl * getDefinition()
Retrieve the definition of this protocol, if any.
Definition: DeclObjC.h:2098
Represents an Objective-C protocol declaration.
Definition: DeclObjC.h:1968
detail::InMemoryDirectory::const_iterator I
The placeholder type for OpenMP array section.
Definition: ASTBitCodes.h:796
The 'char' type, when it is unsigned.
Definition: ASTBitCodes.h:716
unsigned getNumArgs() const
The placeholder type for overloaded function sets.
Definition: ASTBitCodes.h:748
The OpenCL 'half' / ARM NEON __fp16 type.
Definition: ASTBitCodes.h:776
Defines the clang::IdentifierInfo, clang::IdentifierTable, and clang::Selector interfaces.
DeclarationName getDeclName() const
getDeclName - Get the actual, stored name of the declaration, which may be a special name...
Definition: Decl.h:258
TagDecl * getDefinition() const
getDefinition - Returns the TagDecl that actually defines this struct/union/class/enum.
Definition: Decl.cpp:3567
The placeholder type for bound member functions.
Definition: ASTBitCodes.h:770
The 'unsigned long long' type.
Definition: ASTBitCodes.h:726
Kind
const std::string ID
TagDecl - Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:2727
TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT)
Definition: ASTCommon.cpp:27
unsigned ComputeHash(Selector Sel)
Definition: ASTCommon.cpp:167
unsigned TypeAlias
Whether this template specialization type is a substituted type alias.
Definition: Type.h:4171
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1135
The placeholder type for dependent types.
Definition: ASTBitCodes.h:750
Decl::Kind getDeclKind() const
Definition: DeclBase.h:1208
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
bool needsAnonymousDeclarationNumber(const NamedDecl *D)
Determine whether the given declaration needs an anonymous declaration number.
Definition: ASTCommon.cpp:323
This class is used for builtin types like 'int'.
Definition: Type.h:2039
NamedDecl - This represents a decl with a name.
Definition: Decl.h:213
A type index; the type ID with the qualifier bits removed.
Definition: ASTBitCodes.h:83
The pseudo-object placeholder type.
Definition: ASTBitCodes.h:780