clang  3.9.0
CodeGenTypes.cpp
Go to the documentation of this file.
1 //===--- CodeGenTypes.cpp - Type translation for LLVM CodeGen -------------===//
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 is the code that handles AST -> LLVM type lowering.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "CodeGenTypes.h"
15 #include "CGCXXABI.h"
16 #include "CGCall.h"
17 #include "CGOpenCLRuntime.h"
18 #include "CGRecordLayout.h"
19 #include "TargetInfo.h"
20 #include "clang/AST/ASTContext.h"
21 #include "clang/AST/DeclCXX.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/Expr.h"
24 #include "clang/AST/RecordLayout.h"
26 #include "llvm/IR/DataLayout.h"
27 #include "llvm/IR/DerivedTypes.h"
28 #include "llvm/IR/Module.h"
29 using namespace clang;
30 using namespace CodeGen;
31 
33  : CGM(cgm), Context(cgm.getContext()), TheModule(cgm.getModule()),
34  Target(cgm.getTarget()), TheCXXABI(cgm.getCXXABI()),
35  TheABIInfo(cgm.getTargetCodeGenInfo().getABIInfo()) {
36  SkippedLayout = false;
37 }
38 
40  llvm::DeleteContainerSeconds(CGRecordLayouts);
41 
43  I = FunctionInfos.begin(), E = FunctionInfos.end(); I != E; )
44  delete &*I++;
45 }
46 
48  llvm::StructType *Ty,
49  StringRef suffix) {
50  SmallString<256> TypeName;
51  llvm::raw_svector_ostream OS(TypeName);
52  OS << RD->getKindName() << '.';
53 
54  // Name the codegen type after the typedef name
55  // if there is no tag type name available
56  if (RD->getIdentifier()) {
57  // FIXME: We should not have to check for a null decl context here.
58  // Right now we do it because the implicit Obj-C decls don't have one.
59  if (RD->getDeclContext())
60  RD->printQualifiedName(OS);
61  else
62  RD->printName(OS);
63  } else if (const TypedefNameDecl *TDD = RD->getTypedefNameForAnonDecl()) {
64  // FIXME: We should not have to check for a null decl context here.
65  // Right now we do it because the implicit Obj-C decls don't have one.
66  if (TDD->getDeclContext())
67  TDD->printQualifiedName(OS);
68  else
69  TDD->printName(OS);
70  } else
71  OS << "anon";
72 
73  if (!suffix.empty())
74  OS << suffix;
75 
76  Ty->setName(OS.str());
77 }
78 
79 /// ConvertTypeForMem - Convert type T into a llvm::Type. This differs from
80 /// ConvertType in that it is used to convert to the memory representation for
81 /// a type. For example, the scalar representation for _Bool is i1, but the
82 /// memory representation is usually i8 or i32, depending on the target.
84  llvm::Type *R = ConvertType(T);
85 
86  // If this is a non-bool type, don't map it.
87  if (!R->isIntegerTy(1))
88  return R;
89 
90  // Otherwise, return an integer of the target-specified size.
91  return llvm::IntegerType::get(getLLVMContext(),
92  (unsigned)Context.getTypeSize(T));
93 }
94 
95 
96 /// isRecordLayoutComplete - Return true if the specified type is already
97 /// completely laid out.
99  llvm::DenseMap<const Type*, llvm::StructType *>::const_iterator I =
100  RecordDeclTypes.find(Ty);
101  return I != RecordDeclTypes.end() && !I->second->isOpaque();
102 }
103 
104 static bool
106  llvm::SmallPtrSet<const RecordDecl*, 16> &AlreadyChecked);
107 
108 
109 /// isSafeToConvert - Return true if it is safe to convert the specified record
110 /// decl to IR and lay it out, false if doing so would cause us to get into a
111 /// recursive compilation mess.
112 static bool
114  llvm::SmallPtrSet<const RecordDecl*, 16> &AlreadyChecked) {
115  // If we have already checked this type (maybe the same type is used by-value
116  // multiple times in multiple structure fields, don't check again.
117  if (!AlreadyChecked.insert(RD).second)
118  return true;
119 
120  const Type *Key = CGT.getContext().getTagDeclType(RD).getTypePtr();
121 
122  // If this type is already laid out, converting it is a noop.
123  if (CGT.isRecordLayoutComplete(Key)) return true;
124 
125  // If this type is currently being laid out, we can't recursively compile it.
126  if (CGT.isRecordBeingLaidOut(Key))
127  return false;
128 
129  // If this type would require laying out bases that are currently being laid
130  // out, don't do it. This includes virtual base classes which get laid out
131  // when a class is translated, even though they aren't embedded by-value into
132  // the class.
133  if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
134  for (const auto &I : CRD->bases())
135  if (!isSafeToConvert(I.getType()->getAs<RecordType>()->getDecl(),
136  CGT, AlreadyChecked))
137  return false;
138  }
139 
140  // If this type would require laying out members that are currently being laid
141  // out, don't do it.
142  for (const auto *I : RD->fields())
143  if (!isSafeToConvert(I->getType(), CGT, AlreadyChecked))
144  return false;
145 
146  // If there are no problems, lets do it.
147  return true;
148 }
149 
150 /// isSafeToConvert - Return true if it is safe to convert this field type,
151 /// which requires the structure elements contained by-value to all be
152 /// recursively safe to convert.
153 static bool
155  llvm::SmallPtrSet<const RecordDecl*, 16> &AlreadyChecked) {
156  // Strip off atomic type sugar.
157  if (const auto *AT = T->getAs<AtomicType>())
158  T = AT->getValueType();
159 
160  // If this is a record, check it.
161  if (const auto *RT = T->getAs<RecordType>())
162  return isSafeToConvert(RT->getDecl(), CGT, AlreadyChecked);
163 
164  // If this is an array, check the elements, which are embedded inline.
165  if (const auto *AT = CGT.getContext().getAsArrayType(T))
166  return isSafeToConvert(AT->getElementType(), CGT, AlreadyChecked);
167 
168  // Otherwise, there is no concern about transforming this. We only care about
169  // things that are contained by-value in a structure that can have another
170  // structure as a member.
171  return true;
172 }
173 
174 
175 /// isSafeToConvert - Return true if it is safe to convert the specified record
176 /// decl to IR and lay it out, false if doing so would cause us to get into a
177 /// recursive compilation mess.
178 static bool isSafeToConvert(const RecordDecl *RD, CodeGenTypes &CGT) {
179  // If no structs are being laid out, we can certainly do this one.
180  if (CGT.noRecordsBeingLaidOut()) return true;
181 
182  llvm::SmallPtrSet<const RecordDecl*, 16> AlreadyChecked;
183  return isSafeToConvert(RD, CGT, AlreadyChecked);
184 }
185 
186 /// isFuncParamTypeConvertible - Return true if the specified type in a
187 /// function parameter or result position can be converted to an IR type at this
188 /// point. This boils down to being whether it is complete, as well as whether
189 /// we've temporarily deferred expanding the type because we're in a recursive
190 /// context.
192  // Some ABIs cannot have their member pointers represented in IR unless
193  // certain circumstances have been reached.
194  if (const auto *MPT = Ty->getAs<MemberPointerType>())
196 
197  // If this isn't a tagged type, we can convert it!
198  const TagType *TT = Ty->getAs<TagType>();
199  if (!TT) return true;
200 
201  // Incomplete types cannot be converted.
202  if (TT->isIncompleteType())
203  return false;
204 
205  // If this is an enum, then it is always safe to convert.
206  const RecordType *RT = dyn_cast<RecordType>(TT);
207  if (!RT) return true;
208 
209  // Otherwise, we have to be careful. If it is a struct that we're in the
210  // process of expanding, then we can't convert the function type. That's ok
211  // though because we must be in a pointer context under the struct, so we can
212  // just convert it to a dummy type.
213  //
214  // We decide this by checking whether ConvertRecordDeclType returns us an
215  // opaque type for a struct that we know is defined.
216  return isSafeToConvert(RT->getDecl(), *this);
217 }
218 
219 
220 /// Code to verify a given function type is complete, i.e. the return type
221 /// and all of the parameter types are complete. Also check to see if we are in
222 /// a RS_StructPointer context, and if so whether any struct types have been
223 /// pended. If so, we don't want to ask the ABI lowering code to handle a type
224 /// that cannot be converted to an IR type.
227  return false;
228 
229  if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT))
230  for (unsigned i = 0, e = FPT->getNumParams(); i != e; i++)
231  if (!isFuncParamTypeConvertible(FPT->getParamType(i)))
232  return false;
233 
234  return true;
235 }
236 
237 /// UpdateCompletedType - When we find the full definition for a TagDecl,
238 /// replace the 'opaque' type we previously made for it if applicable.
240  // If this is an enum being completed, then we flush all non-struct types from
241  // the cache. This allows function types and other things that may be derived
242  // from the enum to be recomputed.
243  if (const EnumDecl *ED = dyn_cast<EnumDecl>(TD)) {
244  // Only flush the cache if we've actually already converted this type.
245  if (TypeCache.count(ED->getTypeForDecl())) {
246  // Okay, we formed some types based on this. We speculated that the enum
247  // would be lowered to i32, so we only need to flush the cache if this
248  // didn't happen.
249  if (!ConvertType(ED->getIntegerType())->isIntegerTy(32))
250  TypeCache.clear();
251  }
252  // If necessary, provide the full definition of a type only used with a
253  // declaration so far.
254  if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
255  DI->completeType(ED);
256  return;
257  }
258 
259  // If we completed a RecordDecl that we previously used and converted to an
260  // anonymous type, then go ahead and complete it now.
261  const RecordDecl *RD = cast<RecordDecl>(TD);
262  if (RD->isDependentType()) return;
263 
264  // Only complete it if we converted it already. If we haven't converted it
265  // yet, we'll just do it lazily.
266  if (RecordDeclTypes.count(Context.getTagDeclType(RD).getTypePtr()))
268 
269  // If necessary, provide the full definition of a type only used with a
270  // declaration so far.
271  if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
272  DI->completeType(RD);
273 }
274 
276  QualType T = Context.getRecordType(RD);
277  T = Context.getCanonicalType(T);
278 
279  const Type *Ty = T.getTypePtr();
280  if (RecordsWithOpaqueMemberPointers.count(Ty)) {
281  TypeCache.clear();
282  RecordsWithOpaqueMemberPointers.clear();
283  }
284 }
285 
286 static llvm::Type *getTypeForFormat(llvm::LLVMContext &VMContext,
287  const llvm::fltSemantics &format,
288  bool UseNativeHalf = false) {
289  if (&format == &llvm::APFloat::IEEEhalf) {
290  if (UseNativeHalf)
291  return llvm::Type::getHalfTy(VMContext);
292  else
293  return llvm::Type::getInt16Ty(VMContext);
294  }
295  if (&format == &llvm::APFloat::IEEEsingle)
296  return llvm::Type::getFloatTy(VMContext);
297  if (&format == &llvm::APFloat::IEEEdouble)
298  return llvm::Type::getDoubleTy(VMContext);
299  if (&format == &llvm::APFloat::IEEEquad)
300  return llvm::Type::getFP128Ty(VMContext);
301  if (&format == &llvm::APFloat::PPCDoubleDouble)
302  return llvm::Type::getPPC_FP128Ty(VMContext);
303  if (&format == &llvm::APFloat::x87DoubleExtended)
304  return llvm::Type::getX86_FP80Ty(VMContext);
305  llvm_unreachable("Unknown float format!");
306 }
307 
309  const FunctionDecl *FD) {
310  assert(QFT.isCanonical());
311  const Type *Ty = QFT.getTypePtr();
312  const FunctionType *FT = cast<FunctionType>(QFT.getTypePtr());
313  // First, check whether we can build the full function type. If the
314  // function type depends on an incomplete type (e.g. a struct or enum), we
315  // cannot lower the function type.
316  if (!isFuncTypeConvertible(FT)) {
317  // This function's type depends on an incomplete tag type.
318 
319  // Force conversion of all the relevant record types, to make sure
320  // we re-convert the FunctionType when appropriate.
321  if (const RecordType *RT = FT->getReturnType()->getAs<RecordType>())
322  ConvertRecordDeclType(RT->getDecl());
323  if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT))
324  for (unsigned i = 0, e = FPT->getNumParams(); i != e; i++)
325  if (const RecordType *RT = FPT->getParamType(i)->getAs<RecordType>())
326  ConvertRecordDeclType(RT->getDecl());
327 
328  SkippedLayout = true;
329 
330  // Return a placeholder type.
331  return llvm::StructType::get(getLLVMContext());
332  }
333 
334  // While we're converting the parameter types for a function, we don't want
335  // to recursively convert any pointed-to structs. Converting directly-used
336  // structs is ok though.
337  if (!RecordsBeingLaidOut.insert(Ty).second) {
338  SkippedLayout = true;
339  return llvm::StructType::get(getLLVMContext());
340  }
341 
342  // The function type can be built; call the appropriate routines to
343  // build it.
344  const CGFunctionInfo *FI;
345  if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT)) {
348  } else {
349  const FunctionNoProtoType *FNPT = cast<FunctionNoProtoType>(FT);
352  }
353 
354  llvm::Type *ResultType = nullptr;
355  // If there is something higher level prodding our CGFunctionInfo, then
356  // don't recurse into it again.
357  if (FunctionsBeingProcessed.count(FI)) {
358 
359  ResultType = llvm::StructType::get(getLLVMContext());
360  SkippedLayout = true;
361  } else {
362 
363  // Otherwise, we're good to go, go ahead and convert it.
364  ResultType = GetFunctionType(*FI);
365  }
366 
367  RecordsBeingLaidOut.erase(Ty);
368 
369  if (SkippedLayout)
370  TypeCache.clear();
371 
372  if (RecordsBeingLaidOut.empty())
373  while (!DeferredRecords.empty())
374  ConvertRecordDeclType(DeferredRecords.pop_back_val());
375  return ResultType;
376 }
377 
378 /// ConvertType - Convert the specified type to its LLVM form.
380  T = Context.getCanonicalType(T);
381 
382  const Type *Ty = T.getTypePtr();
383 
384  // RecordTypes are cached and processed specially.
385  if (const RecordType *RT = dyn_cast<RecordType>(Ty))
386  return ConvertRecordDeclType(RT->getDecl());
387 
388  // See if type is already cached.
390  // If type is found in map then use it. Otherwise, convert type T.
391  if (TCI != TypeCache.end())
392  return TCI->second;
393 
394  // If we don't have it in the cache, convert it now.
395  llvm::Type *ResultType = nullptr;
396  switch (Ty->getTypeClass()) {
397  case Type::Record: // Handled above.
398 #define TYPE(Class, Base)
399 #define ABSTRACT_TYPE(Class, Base)
400 #define NON_CANONICAL_TYPE(Class, Base) case Type::Class:
401 #define DEPENDENT_TYPE(Class, Base) case Type::Class:
402 #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class:
403 #include "clang/AST/TypeNodes.def"
404  llvm_unreachable("Non-canonical or dependent types aren't possible.");
405 
406  case Type::Builtin: {
407  switch (cast<BuiltinType>(Ty)->getKind()) {
408  case BuiltinType::Void:
409  case BuiltinType::ObjCId:
410  case BuiltinType::ObjCClass:
411  case BuiltinType::ObjCSel:
412  // LLVM void type can only be used as the result of a function call. Just
413  // map to the same as char.
414  ResultType = llvm::Type::getInt8Ty(getLLVMContext());
415  break;
416 
417  case BuiltinType::Bool:
418  // Note that we always return bool as i1 for use as a scalar type.
419  ResultType = llvm::Type::getInt1Ty(getLLVMContext());
420  break;
421 
422  case BuiltinType::Char_S:
423  case BuiltinType::Char_U:
424  case BuiltinType::SChar:
425  case BuiltinType::UChar:
426  case BuiltinType::Short:
427  case BuiltinType::UShort:
428  case BuiltinType::Int:
429  case BuiltinType::UInt:
430  case BuiltinType::Long:
431  case BuiltinType::ULong:
432  case BuiltinType::LongLong:
433  case BuiltinType::ULongLong:
434  case BuiltinType::WChar_S:
435  case BuiltinType::WChar_U:
436  case BuiltinType::Char16:
437  case BuiltinType::Char32:
438  ResultType = llvm::IntegerType::get(getLLVMContext(),
439  static_cast<unsigned>(Context.getTypeSize(T)));
440  break;
441 
442  case BuiltinType::Half:
443  // Half FP can either be storage-only (lowered to i16) or native.
444  ResultType =
446  Context.getLangOpts().NativeHalfType ||
447  Context.getLangOpts().HalfArgsAndReturns);
448  break;
449  case BuiltinType::Float:
450  case BuiltinType::Double:
451  case BuiltinType::LongDouble:
452  case BuiltinType::Float128:
453  ResultType = getTypeForFormat(getLLVMContext(),
454  Context.getFloatTypeSemantics(T),
455  /* UseNativeHalf = */ false);
456  break;
457 
458  case BuiltinType::NullPtr:
459  // Model std::nullptr_t as i8*
460  ResultType = llvm::Type::getInt8PtrTy(getLLVMContext());
461  break;
462 
463  case BuiltinType::UInt128:
464  case BuiltinType::Int128:
465  ResultType = llvm::IntegerType::get(getLLVMContext(), 128);
466  break;
467 
468 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
469  case BuiltinType::Id:
470 #include "clang/Basic/OpenCLImageTypes.def"
471  case BuiltinType::OCLSampler:
472  case BuiltinType::OCLEvent:
473  case BuiltinType::OCLClkEvent:
474  case BuiltinType::OCLQueue:
475  case BuiltinType::OCLNDRange:
476  case BuiltinType::OCLReserveID:
477  ResultType = CGM.getOpenCLRuntime().convertOpenCLSpecificType(Ty);
478  break;
479 
480  case BuiltinType::Dependent:
481 #define BUILTIN_TYPE(Id, SingletonId)
482 #define PLACEHOLDER_TYPE(Id, SingletonId) \
483  case BuiltinType::Id:
484 #include "clang/AST/BuiltinTypes.def"
485  llvm_unreachable("Unexpected placeholder builtin type!");
486  }
487  break;
488  }
489  case Type::Auto:
490  llvm_unreachable("Unexpected undeduced auto type!");
491  case Type::Complex: {
492  llvm::Type *EltTy = ConvertType(cast<ComplexType>(Ty)->getElementType());
493  ResultType = llvm::StructType::get(EltTy, EltTy, nullptr);
494  break;
495  }
496  case Type::LValueReference:
497  case Type::RValueReference: {
498  const ReferenceType *RTy = cast<ReferenceType>(Ty);
499  QualType ETy = RTy->getPointeeType();
500  llvm::Type *PointeeType = ConvertTypeForMem(ETy);
501  unsigned AS = Context.getTargetAddressSpace(ETy);
502  ResultType = llvm::PointerType::get(PointeeType, AS);
503  break;
504  }
505  case Type::Pointer: {
506  const PointerType *PTy = cast<PointerType>(Ty);
507  QualType ETy = PTy->getPointeeType();
508  llvm::Type *PointeeType = ConvertTypeForMem(ETy);
509  if (PointeeType->isVoidTy())
510  PointeeType = llvm::Type::getInt8Ty(getLLVMContext());
511  unsigned AS = Context.getTargetAddressSpace(ETy);
512  ResultType = llvm::PointerType::get(PointeeType, AS);
513  break;
514  }
515 
516  case Type::VariableArray: {
517  const VariableArrayType *A = cast<VariableArrayType>(Ty);
518  assert(A->getIndexTypeCVRQualifiers() == 0 &&
519  "FIXME: We only handle trivial array types so far!");
520  // VLAs resolve to the innermost element type; this matches
521  // the return of alloca, and there isn't any obviously better choice.
522  ResultType = ConvertTypeForMem(A->getElementType());
523  break;
524  }
525  case Type::IncompleteArray: {
526  const IncompleteArrayType *A = cast<IncompleteArrayType>(Ty);
527  assert(A->getIndexTypeCVRQualifiers() == 0 &&
528  "FIXME: We only handle trivial array types so far!");
529  // int X[] -> [0 x int], unless the element type is not sized. If it is
530  // unsized (e.g. an incomplete struct) just use [0 x i8].
531  ResultType = ConvertTypeForMem(A->getElementType());
532  if (!ResultType->isSized()) {
533  SkippedLayout = true;
534  ResultType = llvm::Type::getInt8Ty(getLLVMContext());
535  }
536  ResultType = llvm::ArrayType::get(ResultType, 0);
537  break;
538  }
539  case Type::ConstantArray: {
540  const ConstantArrayType *A = cast<ConstantArrayType>(Ty);
542 
543  // Lower arrays of undefined struct type to arrays of i8 just to have a
544  // concrete type.
545  if (!EltTy->isSized()) {
546  SkippedLayout = true;
547  EltTy = llvm::Type::getInt8Ty(getLLVMContext());
548  }
549 
550  ResultType = llvm::ArrayType::get(EltTy, A->getSize().getZExtValue());
551  break;
552  }
553  case Type::ExtVector:
554  case Type::Vector: {
555  const VectorType *VT = cast<VectorType>(Ty);
556  ResultType = llvm::VectorType::get(ConvertType(VT->getElementType()),
557  VT->getNumElements());
558  break;
559  }
560  case Type::FunctionNoProto:
561  case Type::FunctionProto:
562  ResultType = ConvertFunctionType(T);
563  break;
564  case Type::ObjCObject:
565  ResultType = ConvertType(cast<ObjCObjectType>(Ty)->getBaseType());
566  break;
567 
568  case Type::ObjCInterface: {
569  // Objective-C interfaces are always opaque (outside of the
570  // runtime, which can do whatever it likes); we never refine
571  // these.
572  llvm::Type *&T = InterfaceTypes[cast<ObjCInterfaceType>(Ty)];
573  if (!T)
575  ResultType = T;
576  break;
577  }
578 
579  case Type::ObjCObjectPointer: {
580  // Protocol qualifications do not influence the LLVM type, we just return a
581  // pointer to the underlying interface type. We don't need to worry about
582  // recursive conversion.
583  llvm::Type *T =
584  ConvertTypeForMem(cast<ObjCObjectPointerType>(Ty)->getPointeeType());
585  ResultType = T->getPointerTo();
586  break;
587  }
588 
589  case Type::Enum: {
590  const EnumDecl *ED = cast<EnumType>(Ty)->getDecl();
591  if (ED->isCompleteDefinition() || ED->isFixed())
592  return ConvertType(ED->getIntegerType());
593  // Return a placeholder 'i32' type. This can be changed later when the
594  // type is defined (see UpdateCompletedType), but is likely to be the
595  // "right" answer.
596  ResultType = llvm::Type::getInt32Ty(getLLVMContext());
597  break;
598  }
599 
600  case Type::BlockPointer: {
601  const QualType FTy = cast<BlockPointerType>(Ty)->getPointeeType();
602  llvm::Type *PointeeType = ConvertTypeForMem(FTy);
603  unsigned AS = Context.getTargetAddressSpace(FTy);
604  ResultType = llvm::PointerType::get(PointeeType, AS);
605  break;
606  }
607 
608  case Type::MemberPointer: {
609  auto *MPTy = cast<MemberPointerType>(Ty);
610  if (!getCXXABI().isMemberPointerConvertible(MPTy)) {
611  RecordsWithOpaqueMemberPointers.insert(MPTy->getClass());
613  } else {
614  ResultType = getCXXABI().ConvertMemberPointerType(MPTy);
615  }
616  break;
617  }
618 
619  case Type::Atomic: {
620  QualType valueType = cast<AtomicType>(Ty)->getValueType();
621  ResultType = ConvertTypeForMem(valueType);
622 
623  // Pad out to the inflated size if necessary.
624  uint64_t valueSize = Context.getTypeSize(valueType);
625  uint64_t atomicSize = Context.getTypeSize(Ty);
626  if (valueSize != atomicSize) {
627  assert(valueSize < atomicSize);
628  llvm::Type *elts[] = {
629  ResultType,
630  llvm::ArrayType::get(CGM.Int8Ty, (atomicSize - valueSize) / 8)
631  };
632  ResultType = llvm::StructType::get(getLLVMContext(),
633  llvm::makeArrayRef(elts));
634  }
635  break;
636  }
637  case Type::Pipe: {
638  ResultType = CGM.getOpenCLRuntime().getPipeType();
639  break;
640  }
641  }
642 
643  assert(ResultType && "Didn't convert a type?");
644 
645  TypeCache[Ty] = ResultType;
646  return ResultType;
647 }
648 
650  return isPaddedAtomicType(type->castAs<AtomicType>());
651 }
652 
654  return Context.getTypeSize(type) != Context.getTypeSize(type->getValueType());
655 }
656 
657 /// ConvertRecordDeclType - Lay out a tagged decl type like struct or union.
658 llvm::StructType *CodeGenTypes::ConvertRecordDeclType(const RecordDecl *RD) {
659  // TagDecl's are not necessarily unique, instead use the (clang)
660  // type connected to the decl.
661  const Type *Key = Context.getTagDeclType(RD).getTypePtr();
662 
663  llvm::StructType *&Entry = RecordDeclTypes[Key];
664 
665  // If we don't have a StructType at all yet, create the forward declaration.
666  if (!Entry) {
668  addRecordTypeName(RD, Entry, "");
669  }
670  llvm::StructType *Ty = Entry;
671 
672  // If this is still a forward declaration, or the LLVM type is already
673  // complete, there's nothing more to do.
674  RD = RD->getDefinition();
675  if (!RD || !RD->isCompleteDefinition() || !Ty->isOpaque())
676  return Ty;
677 
678  // If converting this type would cause us to infinitely loop, don't do it!
679  if (!isSafeToConvert(RD, *this)) {
680  DeferredRecords.push_back(RD);
681  return Ty;
682  }
683 
684  // Okay, this is a definition of a type. Compile the implementation now.
685  bool InsertResult = RecordsBeingLaidOut.insert(Key).second;
686  (void)InsertResult;
687  assert(InsertResult && "Recursively compiling a struct?");
688 
689  // Force conversion of non-virtual base classes recursively.
690  if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
691  for (const auto &I : CRD->bases()) {
692  if (I.isVirtual()) continue;
693 
694  ConvertRecordDeclType(I.getType()->getAs<RecordType>()->getDecl());
695  }
696  }
697 
698  // Layout fields.
699  CGRecordLayout *Layout = ComputeRecordLayout(RD, Ty);
700  CGRecordLayouts[Key] = Layout;
701 
702  // We're done laying out this struct.
703  bool EraseResult = RecordsBeingLaidOut.erase(Key); (void)EraseResult;
704  assert(EraseResult && "struct not in RecordsBeingLaidOut set?");
705 
706  // If this struct blocked a FunctionType conversion, then recompute whatever
707  // was derived from that.
708  // FIXME: This is hugely overconservative.
709  if (SkippedLayout)
710  TypeCache.clear();
711 
712  // If we're done converting the outer-most record, then convert any deferred
713  // structs as well.
714  if (RecordsBeingLaidOut.empty())
715  while (!DeferredRecords.empty())
716  ConvertRecordDeclType(DeferredRecords.pop_back_val());
717 
718  return Ty;
719 }
720 
721 /// getCGRecordLayout - Return record layout info for the given record decl.
722 const CGRecordLayout &
724  const Type *Key = Context.getTagDeclType(RD).getTypePtr();
725 
726  const CGRecordLayout *Layout = CGRecordLayouts.lookup(Key);
727  if (!Layout) {
728  // Compute the type information.
730 
731  // Now try again.
732  Layout = CGRecordLayouts.lookup(Key);
733  }
734 
735  assert(Layout && "Unable to find record layout information for type");
736  return *Layout;
737 }
738 
740  // No need to check for member pointers when not compiling C++.
741  if (!Context.getLangOpts().CPlusPlus)
742  return true;
743 
744  if (const auto *AT = Context.getAsArrayType(T)) {
745  if (isa<IncompleteArrayType>(AT))
746  return true;
747  if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
748  if (Context.getConstantArrayElementCount(CAT) == 0)
749  return true;
750  T = Context.getBaseElementType(T);
751  }
752 
753  // Records are non-zero-initializable if they contain any
754  // non-zero-initializable subobjects.
755  if (const RecordType *RT = T->getAs<RecordType>()) {
756  const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
757  return isZeroInitializable(RD);
758  }
759 
760  // We have to ask the ABI about member pointers.
761  if (const MemberPointerType *MPT = T->getAs<MemberPointerType>())
762  return getCXXABI().isZeroInitializable(MPT);
763 
764  // Everything else is okay.
765  return true;
766 }
767 
770 }
unsigned getNumElements() const
Definition: Type.h:2781
CGOpenCLRuntime & getOpenCLRuntime()
Return a reference to the configured OpenCL runtime.
Defines the clang::ASTContext interface.
FunctionDecl - An instance of this class is created to represent a function declaration or definition...
Definition: Decl.h:1561
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2179
A (possibly-)qualified type.
Definition: Type.h:598
void UpdateCompletedType(const TagDecl *TD)
UpdateCompletedType - When we find the full definition for a TagDecl, replace the 'opaque' type we pr...
CGRecordLayout - This class handles struct and union layout info while lowering AST types to LLVM typ...
IdentifierInfo * getIdentifier() const
getIdentifier - Get the identifier that names this declaration, if there is one.
Definition: Decl.h:232
static llvm::Type * getTypeForFormat(llvm::LLVMContext &VMContext, const llvm::fltSemantics &format, bool UseNativeHalf=false)
bool isFixed() const
Returns true if this is an Objective-C, C++11, or Microsoft-style enumeration with a fixed underlying...
Definition: Decl.h:3199
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:2879
const CGFunctionInfo & arrangeFreeFunctionType(CanQual< FunctionProtoType > Ty, const FunctionDecl *FD)
Arrange the argument and result information for a value of the given freestanding function type...
Definition: CGCall.cpp:160
void addRecordTypeName(const RecordDecl *RD, llvm::StructType *Ty, StringRef suffix)
addRecordTypeName - Compute a name from the given record decl with an optional suffix and name the gi...
CGCXXABI & getCXXABI() const
Definition: CodeGenTypes.h:179
ASTContext & getContext() const
Definition: CodeGenTypes.h:176
The base class of the type hierarchy.
Definition: Type.h:1281
QualType getRecordType(const RecordDecl *Decl) const
bool isFuncTypeConvertible(const FunctionType *FT)
isFuncTypeConvertible - Utility to check whether a function type can be converted to an LLVM type (i...
llvm::IntegerType * Int8Ty
i8, i16, i32, and i64
const llvm::APInt & getSize() const
Definition: Type.h:2527
CGDebugInfo * getModuleDebugInfo()
bool isCanonical() const
Definition: Type.h:5303
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:1813
This class gathers all debug information during compilation and is responsible for emitting to llvm g...
Definition: CGDebugInfo.h:52
llvm::Type * ConvertTypeForMem(QualType T)
ConvertTypeForMem - Convert type T into a llvm::Type.
RecordDecl - Represents a struct/union/class.
Definition: Decl.h:3253
unsigned getIndexTypeCVRQualifiers() const
Definition: Type.h:2497
llvm::Type * ConvertType(QualType T)
ConvertType - Convert type T into a llvm::Type.
bool isCompleteDefinition() const
isCompleteDefinition - Return true if this decl has its body fully specified.
Definition: Decl.h:2871
bool isPaddedAtomicType(QualType type)
static bool isSafeToConvert(QualType T, CodeGenTypes &CGT, llvm::SmallPtrSet< const RecordDecl *, 16 > &AlreadyChecked)
isSafeToConvert - Return true if it is safe to convert this field type, which requires the structure ...
const LangOptions & getLangOpts() const
Definition: ASTContext.h:604
QualType getReturnType() const
Definition: Type.h:3009
field_range fields() const
Definition: Decl.h:3382
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
RecordDecl * getDecl() const
Definition: Type.h:3716
TypeClass getTypeClass() const
Definition: Type.h:1533
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types...
Definition: Type.cpp:1892
detail::InMemoryDirectory::const_iterator I
virtual llvm::Type * ConvertMemberPointerType(const MemberPointerType *MPT)
Find the LLVM type used to represent the given member pointer type.
Definition: CGCXXABI.cpp:72
virtual llvm::Type * convertOpenCLSpecificType(const Type *T)
virtual bool isZeroInitializable(const MemberPointerType *MPT)
Return true if the given member pointer can be zero-initialized (in the C++ sense) with an LLVM zeroi...
Definition: CGCXXABI.cpp:151
Represents a K&R-style 'int foo()' function, which has no information available about its arguments...
Definition: Type.h:3039
QualType getValueType() const
Gets the type contained by this atomic type, i.e.
Definition: Type.h:5173
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3073
ASTContext * Context
virtual bool isMemberPointerConvertible(const MemberPointerType *MPT) const
Return whether or not a member pointers type is convertible to an IR type.
Definition: CGCXXABI.h:184
CodeGenTypes(CodeGenModule &cgm)
Represents a GCC generic vector type.
Definition: Type.h:2756
QualType getElementType() const
Definition: Type.h:2780
RecordDecl * getDefinition() const
getDefinition - Returns the RecordDecl that actually defines this struct/union/class.
Definition: Decl.h:3372
TypedefNameDecl * getTypedefNameForAnonDecl() const
Definition: Decl.h:2961
The l-value was considered opaque, so the alignment was determined from a type.
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:5259
const TemplateArgument * iterator
Definition: Type.h:4233
TagDecl - Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:2727
void printName(raw_ostream &os) const
Definition: Decl.h:254
Represents a canonical, potentially-qualified type.
Definition: CanonicalType.h:52
llvm::LLVMContext & getLLVMContext()
Definition: CodeGenTypes.h:180
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:5849
bool isDependentType() const
Whether this declaration declares a type that is dependent, i.e., a type that somehow depends on temp...
Definition: Decl.h:2901
void printQualifiedName(raw_ostream &OS) const
printQualifiedName - Returns human-readable qualified name for declaration, like A::B::i, for i being member of namespace A::B.
Definition: Decl.cpp:1405
QualType getPointeeType() const
Definition: Type.h:2193
bool isRecordBeingLaidOut(const Type *Ty) const
Definition: CodeGenTypes.h:363
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2609
CGFunctionInfo - Class to encapsulate the information about a function definition.
This class organizes the cross-function state that is used while generating LLVM code.
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Definition: ASTMatchers.h:1983
std::unique_ptr< DiagnosticConsumer > create(StringRef OutputFile, DiagnosticOptions *Diags, bool MergeChildRecords=false)
Returns a DiagnosticConsumer that serializes diagnostics to a bitcode file.
EnumDecl - Represents an enum.
Definition: Decl.h:3013
detail::InMemoryDirectory::const_iterator E
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2401
bool isZeroInitializable() const
Check whether this struct can be C++ zero-initialized with a zeroinitializer.
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:1966
llvm::StructType * ConvertRecordDeclType(const RecordDecl *TD)
ConvertRecordDeclType - Lay out a tagged decl type like struct or union.
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:3707
const T * getAs() const
Member-template getAs<specific type>'.
Definition: Type.h:5818
llvm::Type * ConvertFunctionType(QualType FT, const FunctionDecl *FD=nullptr)
Converts the GlobalDecl into an llvm::Type.
This class organizes the cross-module state that is used while lowering AST types to LLVM types...
Definition: CodeGenTypes.h:120
QualType getIntegerType() const
getIntegerType - Return the integer type this enum decl corresponds to.
Definition: Decl.h:3137
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:2319
bool isRecordLayoutComplete(const Type *Ty) const
isRecordLayoutComplete - Return true if the specified type is already completely laid out...
QualType getTagDeclType(const TagDecl *Decl) const
Return the unique reference to the type for the specified TagDecl (struct/union/class/enum) decl...
QualType getPointeeType() const
Definition: Type.h:2340
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
Represents a C++ struct/union/class.
Definition: DeclCXX.h:263
Represents a C array with an unspecified size.
Definition: Type.h:2562
bool isFuncParamTypeConvertible(QualType Ty)
isFuncParamTypeConvertible - Return true if the specified type in a function parameter or result posi...
virtual llvm::Type * getPipeType()
void RefreshTypeCacheForClass(const CXXRecordDecl *RD)
Remove stale types from the type cache when an inheritance model gets assigned to a class...
static Decl::Kind getKind(const Decl *D)
Definition: DeclBase.cpp:810
unsigned getTargetAddressSpace(QualType T) const
Definition: ASTContext.h:2200
QualType getElementType() const
Definition: Type.h:2490
uint64_t getConstantArrayElementCount(const ConstantArrayType *CA) const
Return number of constant array elements.
CGRecordLayout * ComputeRecordLayout(const RecordDecl *D, llvm::StructType *Ty)
Compute a new LLVM record layout object for the given record.
StringRef getKindName() const
Definition: Decl.h:2926
const llvm::fltSemantics & getFloatTypeSemantics(QualType T) const
Return the APFloat 'semantics' for the specified scalar floating point type.
Represents a C array with a specified size that is not an integer-constant-expression.
Definition: Type.h:2607
const CGRecordLayout & getCGRecordLayout(const RecordDecl *)
getCGRecordLayout - Return record layout info for the given record decl.
bool noRecordsBeingLaidOut() const
Definition: CodeGenTypes.h:360
Represents the canonical version of C arrays with a specified constant size.
Definition: Type.h:2512
QualType getBaseElementType(const ArrayType *VAT) const
Return the innermost element type of an array type.
bool isZeroInitializable(QualType T)
IsZeroInitializable - Return whether a type can be zero-initialized (in the C++ sense) with an LLVM z...
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1466