ASTContext.cpp revision f8af98286022f72157d84951b48fde5fb369ab29 
1//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===//
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 implements the ASTContext interface.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/CharUnits.h"
16#include "clang/AST/DeclCXX.h"
17#include "clang/AST/DeclObjC.h"
18#include "clang/AST/DeclTemplate.h"
19#include "clang/AST/TypeLoc.h"
20#include "clang/AST/Expr.h"
21#include "clang/AST/ExprCXX.h"
22#include "clang/AST/ExternalASTSource.h"
23#include "clang/AST/ASTMutationListener.h"
24#include "clang/AST/RecordLayout.h"
25#include "clang/AST/Mangle.h"
26#include "clang/Basic/Builtins.h"
27#include "clang/Basic/SourceManager.h"
28#include "clang/Basic/TargetInfo.h"
29#include "llvm/ADT/SmallString.h"
30#include "llvm/ADT/StringExtras.h"
31#include "llvm/Support/MathExtras.h"
32#include "llvm/Support/raw_ostream.h"
33#include "llvm/Support/Capacity.h"
34#include "CXXABI.h"
35#include <map>
36
37using namespace clang;
38
39unsigned ASTContext::NumImplicitDefaultConstructors;
40unsigned ASTContext::NumImplicitDefaultConstructorsDeclared;
41unsigned ASTContext::NumImplicitCopyConstructors;
42unsigned ASTContext::NumImplicitCopyConstructorsDeclared;
43unsigned ASTContext::NumImplicitMoveConstructors;
44unsigned ASTContext::NumImplicitMoveConstructorsDeclared;
45unsigned ASTContext::NumImplicitCopyAssignmentOperators;
46unsigned ASTContext::NumImplicitCopyAssignmentOperatorsDeclared;
47unsigned ASTContext::NumImplicitMoveAssignmentOperators;
48unsigned ASTContext::NumImplicitMoveAssignmentOperatorsDeclared;
49unsigned ASTContext::NumImplicitDestructors;
50unsigned ASTContext::NumImplicitDestructorsDeclared;
51
52enum FloatingRank {
53  HalfRank, FloatRank, DoubleRank, LongDoubleRank
54};
55
56void
57ASTContext::CanonicalTemplateTemplateParm::Profile(llvm::FoldingSetNodeID &ID,
58                                               TemplateTemplateParmDecl *Parm) {
59  ID.AddInteger(Parm->getDepth());
60  ID.AddInteger(Parm->getPosition());
61  ID.AddBoolean(Parm->isParameterPack());
62
63  TemplateParameterList *Params = Parm->getTemplateParameters();
64  ID.AddInteger(Params->size());
65  for (TemplateParameterList::const_iterator P = Params->begin(),
66                                          PEnd = Params->end();
67       P != PEnd; ++P) {
68    if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*P)) {
69      ID.AddInteger(0);
70      ID.AddBoolean(TTP->isParameterPack());
71      continue;
72    }
73
74    if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(*P)) {
75      ID.AddInteger(1);
76      ID.AddBoolean(NTTP->isParameterPack());
77      ID.AddPointer(NTTP->getType().getAsOpaquePtr());
78      if (NTTP->isExpandedParameterPack()) {
79        ID.AddBoolean(true);
80        ID.AddInteger(NTTP->getNumExpansionTypes());
81        for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I)
82          ID.AddPointer(NTTP->getExpansionType(I).getAsOpaquePtr());
83      } else
84        ID.AddBoolean(false);
85      continue;
86    }
87
88    TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(*P);
89    ID.AddInteger(2);
90    Profile(ID, TTP);
91  }
92}
93
94TemplateTemplateParmDecl *
95ASTContext::getCanonicalTemplateTemplateParmDecl(
96                                          TemplateTemplateParmDecl *TTP) const {
97  // Check if we already have a canonical template template parameter.
98  llvm::FoldingSetNodeID ID;
99  CanonicalTemplateTemplateParm::Profile(ID, TTP);
100  void *InsertPos = 0;
101  CanonicalTemplateTemplateParm *Canonical
102    = CanonTemplateTemplateParms.FindNodeOrInsertPos(ID, InsertPos);
103  if (Canonical)
104    return Canonical->getParam();
105
106  // Build a canonical template parameter list.
107  TemplateParameterList *Params = TTP->getTemplateParameters();
108  SmallVector<NamedDecl *, 4> CanonParams;
109  CanonParams.reserve(Params->size());
110  for (TemplateParameterList::const_iterator P = Params->begin(),
111                                          PEnd = Params->end();
112       P != PEnd; ++P) {
113    if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*P))
114      CanonParams.push_back(
115                  TemplateTypeParmDecl::Create(*this, getTranslationUnitDecl(),
116                                               SourceLocation(),
117                                               SourceLocation(),
118                                               TTP->getDepth(),
119                                               TTP->getIndex(), 0, false,
120                                               TTP->isParameterPack()));
121    else if (NonTypeTemplateParmDecl *NTTP
122             = dyn_cast<NonTypeTemplateParmDecl>(*P)) {
123      QualType T = getCanonicalType(NTTP->getType());
124      TypeSourceInfo *TInfo = getTrivialTypeSourceInfo(T);
125      NonTypeTemplateParmDecl *Param;
126      if (NTTP->isExpandedParameterPack()) {
127        SmallVector<QualType, 2> ExpandedTypes;
128        SmallVector<TypeSourceInfo *, 2> ExpandedTInfos;
129        for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I) {
130          ExpandedTypes.push_back(getCanonicalType(NTTP->getExpansionType(I)));
131          ExpandedTInfos.push_back(
132                                getTrivialTypeSourceInfo(ExpandedTypes.back()));
133        }
134
135        Param = NonTypeTemplateParmDecl::Create(*this, getTranslationUnitDecl(),
136                                                SourceLocation(),
137                                                SourceLocation(),
138                                                NTTP->getDepth(),
139                                                NTTP->getPosition(), 0,
140                                                T,
141                                                TInfo,
142                                                ExpandedTypes.data(),
143                                                ExpandedTypes.size(),
144                                                ExpandedTInfos.data());
145      } else {
146        Param = NonTypeTemplateParmDecl::Create(*this, getTranslationUnitDecl(),
147                                                SourceLocation(),
148                                                SourceLocation(),
149                                                NTTP->getDepth(),
150                                                NTTP->getPosition(), 0,
151                                                T,
152                                                NTTP->isParameterPack(),
153                                                TInfo);
154      }
155      CanonParams.push_back(Param);
156
157    } else
158      CanonParams.push_back(getCanonicalTemplateTemplateParmDecl(
159                                           cast<TemplateTemplateParmDecl>(*P)));
160  }
161
162  TemplateTemplateParmDecl *CanonTTP
163    = TemplateTemplateParmDecl::Create(*this, getTranslationUnitDecl(),
164                                       SourceLocation(), TTP->getDepth(),
165                                       TTP->getPosition(),
166                                       TTP->isParameterPack(),
167                                       0,
168                         TemplateParameterList::Create(*this, SourceLocation(),
169                                                       SourceLocation(),
170                                                       CanonParams.data(),
171                                                       CanonParams.size(),
172                                                       SourceLocation()));
173
174  // Get the new insert position for the node we care about.
175  Canonical = CanonTemplateTemplateParms.FindNodeOrInsertPos(ID, InsertPos);
176  assert(Canonical == 0 && "Shouldn't be in the map!");
177  (void)Canonical;
178
179  // Create the canonical template template parameter entry.
180  Canonical = new (*this) CanonicalTemplateTemplateParm(CanonTTP);
181  CanonTemplateTemplateParms.InsertNode(Canonical, InsertPos);
182  return CanonTTP;
183}
184
185CXXABI *ASTContext::createCXXABI(const TargetInfo &T) {
186  if (!LangOpts.CPlusPlus) return 0;
187
188  switch (T.getCXXABI()) {
189  case CXXABI_ARM:
190    return CreateARMCXXABI(*this);
191  case CXXABI_Itanium:
192    return CreateItaniumCXXABI(*this);
193  case CXXABI_Microsoft:
194    return CreateMicrosoftCXXABI(*this);
195  }
196  llvm_unreachable("Invalid CXXABI type!");
197}
198
199static const LangAS::Map *getAddressSpaceMap(const TargetInfo &T,
200                                             const LangOptions &LOpts) {
201  if (LOpts.FakeAddressSpaceMap) {
202    // The fake address space map must have a distinct entry for each
203    // language-specific address space.
204    static const unsigned FakeAddrSpaceMap[] = {
205      1, // opencl_global
206      2, // opencl_local
207      3  // opencl_constant
208    };
209    return &FakeAddrSpaceMap;
210  } else {
211    return &T.getAddressSpaceMap();
212  }
213}
214
215ASTContext::ASTContext(LangOptions& LOpts, SourceManager &SM,
216                       const TargetInfo *t,
217                       IdentifierTable &idents, SelectorTable &sels,
218                       Builtin::Context &builtins,
219                       unsigned size_reserve,
220                       bool DelayInitialization)
221  : FunctionProtoTypes(this_()),
222    TemplateSpecializationTypes(this_()),
223    DependentTemplateSpecializationTypes(this_()),
224    SubstTemplateTemplateParmPacks(this_()),
225    GlobalNestedNameSpecifier(0),
226    Int128Decl(0), UInt128Decl(0),
227    ObjCIdDecl(0), ObjCSelDecl(0), ObjCClassDecl(0), ObjCProtocolClassDecl(0),
228    CFConstantStringTypeDecl(0), ObjCInstanceTypeDecl(0),
229    FILEDecl(0),
230    jmp_bufDecl(0), sigjmp_bufDecl(0), ucontext_tDecl(0),
231    BlockDescriptorType(0), BlockDescriptorExtendedType(0),
232    cudaConfigureCallDecl(0),
233    NullTypeSourceInfo(QualType()),
234    FirstLocalImport(), LastLocalImport(),
235    SourceMgr(SM), LangOpts(LOpts),
236    AddrSpaceMap(0), Target(t), PrintingPolicy(LOpts),
237    Idents(idents), Selectors(sels),
238    BuiltinInfo(builtins),
239    DeclarationNames(*this),
240    ExternalSource(0), Listener(0),
241    LastSDM(0, 0),
242    UniqueBlockByRefTypeID(0)
243{
244  if (size_reserve > 0) Types.reserve(size_reserve);
245  TUDecl = TranslationUnitDecl::Create(*this);
246
247  if (!DelayInitialization) {
248    assert(t && "No target supplied for ASTContext initialization");
249    InitBuiltinTypes(*t);
250  }
251}
252
253ASTContext::~ASTContext() {
254  // Release the DenseMaps associated with DeclContext objects.
255  // FIXME: Is this the ideal solution?
256  ReleaseDeclContextMaps();
257
258  // Call all of the deallocation functions.
259  for (unsigned I = 0, N = Deallocations.size(); I != N; ++I)
260    Deallocations[I].first(Deallocations[I].second);
261
262  // Release all of the memory associated with overridden C++ methods.
263  for (llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::iterator
264         OM = OverriddenMethods.begin(), OMEnd = OverriddenMethods.end();
265       OM != OMEnd; ++OM)
266    OM->second.Destroy();
267
268  // ASTRecordLayout objects in ASTRecordLayouts must always be destroyed
269  // because they can contain DenseMaps.
270  for (llvm::DenseMap<const ObjCContainerDecl*,
271       const ASTRecordLayout*>::iterator
272       I = ObjCLayouts.begin(), E = ObjCLayouts.end(); I != E; )
273    // Increment in loop to prevent using deallocated memory.
274    if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second))
275      R->Destroy(*this);
276
277  for (llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator
278       I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); I != E; ) {
279    // Increment in loop to prevent using deallocated memory.
280    if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second))
281      R->Destroy(*this);
282  }
283
284  for (llvm::DenseMap<const Decl*, AttrVec*>::iterator A = DeclAttrs.begin(),
285                                                    AEnd = DeclAttrs.end();
286       A != AEnd; ++A)
287    A->second->~AttrVec();
288}
289
290void ASTContext::AddDeallocation(void (*Callback)(void*), void *Data) {
291  Deallocations.push_back(std::make_pair(Callback, Data));
292}
293
294void
295ASTContext::setExternalSource(OwningPtr<ExternalASTSource> &Source) {
296  ExternalSource.reset(Source.take());
297}
298
299void ASTContext::PrintStats() const {
300  llvm::errs() << "\n*** AST Context Stats:\n";
301  llvm::errs() << "  " << Types.size() << " types total.\n";
302
303  unsigned counts[] = {
304#define TYPE(Name, Parent) 0,
305#define ABSTRACT_TYPE(Name, Parent)
306#include "clang/AST/TypeNodes.def"
307    0 // Extra
308  };
309
310  for (unsigned i = 0, e = Types.size(); i != e; ++i) {
311    Type *T = Types[i];
312    counts[(unsigned)T->getTypeClass()]++;
313  }
314
315  unsigned Idx = 0;
316  unsigned TotalBytes = 0;
317#define TYPE(Name, Parent)                                              \
318  if (counts[Idx])                                                      \
319    llvm::errs() << "    " << counts[Idx] << " " << #Name               \
320                 << " types\n";                                         \
321  TotalBytes += counts[Idx] * sizeof(Name##Type);                       \
322  ++Idx;
323#define ABSTRACT_TYPE(Name, Parent)
324#include "clang/AST/TypeNodes.def"
325
326  llvm::errs() << "Total bytes = " << TotalBytes << "\n";
327
328  // Implicit special member functions.
329  llvm::errs() << NumImplicitDefaultConstructorsDeclared << "/"
330               << NumImplicitDefaultConstructors
331               << " implicit default constructors created\n";
332  llvm::errs() << NumImplicitCopyConstructorsDeclared << "/"
333               << NumImplicitCopyConstructors
334               << " implicit copy constructors created\n";
335  if (getLangOptions().CPlusPlus)
336    llvm::errs() << NumImplicitMoveConstructorsDeclared << "/"
337                 << NumImplicitMoveConstructors
338                 << " implicit move constructors created\n";
339  llvm::errs() << NumImplicitCopyAssignmentOperatorsDeclared << "/"
340               << NumImplicitCopyAssignmentOperators
341               << " implicit copy assignment operators created\n";
342  if (getLangOptions().CPlusPlus)
343    llvm::errs() << NumImplicitMoveAssignmentOperatorsDeclared << "/"
344                 << NumImplicitMoveAssignmentOperators
345                 << " implicit move assignment operators created\n";
346  llvm::errs() << NumImplicitDestructorsDeclared << "/"
347               << NumImplicitDestructors
348               << " implicit destructors created\n";
349
350  if (ExternalSource.get()) {
351    llvm::errs() << "\n";
352    ExternalSource->PrintStats();
353  }
354
355  BumpAlloc.PrintStats();
356}
357
358TypedefDecl *ASTContext::getInt128Decl() const {
359  if (!Int128Decl) {
360    TypeSourceInfo *TInfo = getTrivialTypeSourceInfo(Int128Ty);
361    Int128Decl = TypedefDecl::Create(const_cast<ASTContext &>(*this),
362                                     getTranslationUnitDecl(),
363                                     SourceLocation(),
364                                     SourceLocation(),
365                                     &Idents.get("__int128_t"),
366                                     TInfo);
367  }
368
369  return Int128Decl;
370}
371
372TypedefDecl *ASTContext::getUInt128Decl() const {
373  if (!UInt128Decl) {
374    TypeSourceInfo *TInfo = getTrivialTypeSourceInfo(UnsignedInt128Ty);
375    UInt128Decl = TypedefDecl::Create(const_cast<ASTContext &>(*this),
376                                     getTranslationUnitDecl(),
377                                     SourceLocation(),
378                                     SourceLocation(),
379                                     &Idents.get("__uint128_t"),
380                                     TInfo);
381  }
382
383  return UInt128Decl;
384}
385
386void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) {
387  BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K);
388  R = CanQualType::CreateUnsafe(QualType(Ty, 0));
389  Types.push_back(Ty);
390}
391
392void ASTContext::InitBuiltinTypes(const TargetInfo &Target) {
393  assert((!this->Target || this->Target == &Target) &&
394         "Incorrect target reinitialization");
395  assert(VoidTy.isNull() && "Context reinitialized?");
396
397  this->Target = &Target;
398
399  ABI.reset(createCXXABI(Target));
400  AddrSpaceMap = getAddressSpaceMap(Target, LangOpts);
401
402  // C99 6.2.5p19.
403  InitBuiltinType(VoidTy,              BuiltinType::Void);
404
405  // C99 6.2.5p2.
406  InitBuiltinType(BoolTy,              BuiltinType::Bool);
407  // C99 6.2.5p3.
408  if (LangOpts.CharIsSigned)
409    InitBuiltinType(CharTy,            BuiltinType::Char_S);
410  else
411    InitBuiltinType(CharTy,            BuiltinType::Char_U);
412  // C99 6.2.5p4.
413  InitBuiltinType(SignedCharTy,        BuiltinType::SChar);
414  InitBuiltinType(ShortTy,             BuiltinType::Short);
415  InitBuiltinType(IntTy,               BuiltinType::Int);
416  InitBuiltinType(LongTy,              BuiltinType::Long);
417  InitBuiltinType(LongLongTy,          BuiltinType::LongLong);
418
419  // C99 6.2.5p6.
420  InitBuiltinType(UnsignedCharTy,      BuiltinType::UChar);
421  InitBuiltinType(UnsignedShortTy,     BuiltinType::UShort);
422  InitBuiltinType(UnsignedIntTy,       BuiltinType::UInt);
423  InitBuiltinType(UnsignedLongTy,      BuiltinType::ULong);
424  InitBuiltinType(UnsignedLongLongTy,  BuiltinType::ULongLong);
425
426  // C99 6.2.5p10.
427  InitBuiltinType(FloatTy,             BuiltinType::Float);
428  InitBuiltinType(DoubleTy,            BuiltinType::Double);
429  InitBuiltinType(LongDoubleTy,        BuiltinType::LongDouble);
430
431  // GNU extension, 128-bit integers.
432  InitBuiltinType(Int128Ty,            BuiltinType::Int128);
433  InitBuiltinType(UnsignedInt128Ty,    BuiltinType::UInt128);
434
435  if (LangOpts.CPlusPlus) { // C++ 3.9.1p5
436    if (TargetInfo::isTypeSigned(Target.getWCharType()))
437      InitBuiltinType(WCharTy,           BuiltinType::WChar_S);
438    else  // -fshort-wchar makes wchar_t be unsigned.
439      InitBuiltinType(WCharTy,           BuiltinType::WChar_U);
440  } else // C99
441    WCharTy = getFromTargetType(Target.getWCharType());
442
443  if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++
444    InitBuiltinType(Char16Ty,           BuiltinType::Char16);
445  else // C99
446    Char16Ty = getFromTargetType(Target.getChar16Type());
447
448  if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++
449    InitBuiltinType(Char32Ty,           BuiltinType::Char32);
450  else // C99
451    Char32Ty = getFromTargetType(Target.getChar32Type());
452
453  // Placeholder type for type-dependent expressions whose type is
454  // completely unknown. No code should ever check a type against
455  // DependentTy and users should never see it; however, it is here to
456  // help diagnose failures to properly check for type-dependent
457  // expressions.
458  InitBuiltinType(DependentTy,         BuiltinType::Dependent);
459
460  // Placeholder type for functions.
461  InitBuiltinType(OverloadTy,          BuiltinType::Overload);
462
463  // Placeholder type for bound members.
464  InitBuiltinType(BoundMemberTy,       BuiltinType::BoundMember);
465
466  // Placeholder type for pseudo-objects.
467  InitBuiltinType(PseudoObjectTy,      BuiltinType::PseudoObject);
468
469  // "any" type; useful for debugger-like clients.
470  InitBuiltinType(UnknownAnyTy,        BuiltinType::UnknownAny);
471
472  // Placeholder type for unbridged ARC casts.
473  InitBuiltinType(ARCUnbridgedCastTy,  BuiltinType::ARCUnbridgedCast);
474
475  // C99 6.2.5p11.
476  FloatComplexTy      = getComplexType(FloatTy);
477  DoubleComplexTy     = getComplexType(DoubleTy);
478  LongDoubleComplexTy = getComplexType(LongDoubleTy);
479
480  BuiltinVaListType = QualType();
481
482  // Builtin types for 'id', 'Class', and 'SEL'.
483  InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId);
484  InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass);
485  InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel);
486
487  ObjCConstantStringType = QualType();
488
489  // void * type
490  VoidPtrTy = getPointerType(VoidTy);
491
492  // nullptr type (C++0x 2.14.7)
493  InitBuiltinType(NullPtrTy,           BuiltinType::NullPtr);
494
495  // half type (OpenCL 6.1.1.1) / ARM NEON __fp16
496  InitBuiltinType(HalfTy, BuiltinType::Half);
497}
498
499DiagnosticsEngine &ASTContext::getDiagnostics() const {
500  return SourceMgr.getDiagnostics();
501}
502
503AttrVec& ASTContext::getDeclAttrs(const Decl *D) {
504  AttrVec *&Result = DeclAttrs[D];
505  if (!Result) {
506    void *Mem = Allocate(sizeof(AttrVec));
507    Result = new (Mem) AttrVec;
508  }
509
510  return *Result;
511}
512
513/// \brief Erase the attributes corresponding to the given declaration.
514void ASTContext::eraseDeclAttrs(const Decl *D) {
515  llvm::DenseMap<const Decl*, AttrVec*>::iterator Pos = DeclAttrs.find(D);
516  if (Pos != DeclAttrs.end()) {
517    Pos->second->~AttrVec();
518    DeclAttrs.erase(Pos);
519  }
520}
521
522MemberSpecializationInfo *
523ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) {
524  assert(Var->isStaticDataMember() && "Not a static data member");
525  llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos
526    = InstantiatedFromStaticDataMember.find(Var);
527  if (Pos == InstantiatedFromStaticDataMember.end())
528    return 0;
529
530  return Pos->second;
531}
532
533void
534ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl,
535                                                TemplateSpecializationKind TSK,
536                                          SourceLocation PointOfInstantiation) {
537  assert(Inst->isStaticDataMember() && "Not a static data member");
538  assert(Tmpl->isStaticDataMember() && "Not a static data member");
539  assert(!InstantiatedFromStaticDataMember[Inst] &&
540         "Already noted what static data member was instantiated from");
541  InstantiatedFromStaticDataMember[Inst]
542    = new (*this) MemberSpecializationInfo(Tmpl, TSK, PointOfInstantiation);
543}
544
545FunctionDecl *ASTContext::getClassScopeSpecializationPattern(
546                                                     const FunctionDecl *FD){
547  assert(FD && "Specialization is 0");
548  llvm::DenseMap<const FunctionDecl*, FunctionDecl *>::const_iterator Pos
549    = ClassScopeSpecializationPattern.find(FD);
550  if (Pos == ClassScopeSpecializationPattern.end())
551    return 0;
552
553  return Pos->second;
554}
555
556void ASTContext::setClassScopeSpecializationPattern(FunctionDecl *FD,
557                                        FunctionDecl *Pattern) {
558  assert(FD && "Specialization is 0");
559  assert(Pattern && "Class scope specialization pattern is 0");
560  ClassScopeSpecializationPattern[FD] = Pattern;
561}
562
563NamedDecl *
564ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) {
565  llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos
566    = InstantiatedFromUsingDecl.find(UUD);
567  if (Pos == InstantiatedFromUsingDecl.end())
568    return 0;
569
570  return Pos->second;
571}
572
573void
574ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) {
575  assert((isa<UsingDecl>(Pattern) ||
576          isa<UnresolvedUsingValueDecl>(Pattern) ||
577          isa<UnresolvedUsingTypenameDecl>(Pattern)) &&
578         "pattern decl is not a using decl");
579  assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists");
580  InstantiatedFromUsingDecl[Inst] = Pattern;
581}
582
583UsingShadowDecl *
584ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) {
585  llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos
586    = InstantiatedFromUsingShadowDecl.find(Inst);
587  if (Pos == InstantiatedFromUsingShadowDecl.end())
588    return 0;
589
590  return Pos->second;
591}
592
593void
594ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst,
595                                               UsingShadowDecl *Pattern) {
596  assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists");
597  InstantiatedFromUsingShadowDecl[Inst] = Pattern;
598}
599
600FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) {
601  llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos
602    = InstantiatedFromUnnamedFieldDecl.find(Field);
603  if (Pos == InstantiatedFromUnnamedFieldDecl.end())
604    return 0;
605
606  return Pos->second;
607}
608
609void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst,
610                                                     FieldDecl *Tmpl) {
611  assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed");
612  assert(!Tmpl->getDeclName() && "Template field decl is not unnamed");
613  assert(!InstantiatedFromUnnamedFieldDecl[Inst] &&
614         "Already noted what unnamed field was instantiated from");
615
616  InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl;
617}
618
619bool ASTContext::ZeroBitfieldFollowsNonBitfield(const FieldDecl *FD,
620                                    const FieldDecl *LastFD) const {
621  return (FD->isBitField() && LastFD && !LastFD->isBitField() &&
622          FD->getBitWidthValue(*this) == 0);
623}
624
625bool ASTContext::ZeroBitfieldFollowsBitfield(const FieldDecl *FD,
626                                             const FieldDecl *LastFD) const {
627  return (FD->isBitField() && LastFD && LastFD->isBitField() &&
628          FD->getBitWidthValue(*this) == 0 &&
629          LastFD->getBitWidthValue(*this) != 0);
630}
631
632bool ASTContext::BitfieldFollowsBitfield(const FieldDecl *FD,
633                                         const FieldDecl *LastFD) const {
634  return (FD->isBitField() && LastFD && LastFD->isBitField() &&
635          FD->getBitWidthValue(*this) &&
636          LastFD->getBitWidthValue(*this));
637}
638
639bool ASTContext::NonBitfieldFollowsBitfield(const FieldDecl *FD,
640                                         const FieldDecl *LastFD) const {
641  return (!FD->isBitField() && LastFD && LastFD->isBitField() &&
642          LastFD->getBitWidthValue(*this));
643}
644
645bool ASTContext::BitfieldFollowsNonBitfield(const FieldDecl *FD,
646                                             const FieldDecl *LastFD) const {
647  return (FD->isBitField() && LastFD && !LastFD->isBitField() &&
648          FD->getBitWidthValue(*this));
649}
650
651ASTContext::overridden_cxx_method_iterator
652ASTContext::overridden_methods_begin(const CXXMethodDecl *Method) const {
653  llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos
654    = OverriddenMethods.find(Method);
655  if (Pos == OverriddenMethods.end())
656    return 0;
657
658  return Pos->second.begin();
659}
660
661ASTContext::overridden_cxx_method_iterator
662ASTContext::overridden_methods_end(const CXXMethodDecl *Method) const {
663  llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos
664    = OverriddenMethods.find(Method);
665  if (Pos == OverriddenMethods.end())
666    return 0;
667
668  return Pos->second.end();
669}
670
671unsigned
672ASTContext::overridden_methods_size(const CXXMethodDecl *Method) const {
673  llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos
674    = OverriddenMethods.find(Method);
675  if (Pos == OverriddenMethods.end())
676    return 0;
677
678  return Pos->second.size();
679}
680
681void ASTContext::addOverriddenMethod(const CXXMethodDecl *Method,
682                                     const CXXMethodDecl *Overridden) {
683  OverriddenMethods[Method].push_back(Overridden);
684}
685
686void ASTContext::addedLocalImportDecl(ImportDecl *Import) {
687  assert(!Import->NextLocalImport && "Import declaration already in the chain");
688  assert(!Import->isFromASTFile() && "Non-local import declaration");
689  if (!FirstLocalImport) {
690    FirstLocalImport = Import;
691    LastLocalImport = Import;
692    return;
693  }
694
695  LastLocalImport->NextLocalImport = Import;
696  LastLocalImport = Import;
697}
698
699//===----------------------------------------------------------------------===//
700//                         Type Sizing and Analysis
701//===----------------------------------------------------------------------===//
702
703/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified
704/// scalar floating point type.
705const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const {
706  const BuiltinType *BT = T->getAs<BuiltinType>();
707  assert(BT && "Not a floating point type!");
708  switch (BT->getKind()) {
709  default: llvm_unreachable("Not a floating point type!");
710  case BuiltinType::Half:       return Target->getHalfFormat();
711  case BuiltinType::Float:      return Target->getFloatFormat();
712  case BuiltinType::Double:     return Target->getDoubleFormat();
713  case BuiltinType::LongDouble: return Target->getLongDoubleFormat();
714  }
715}
716
717/// getDeclAlign - Return a conservative estimate of the alignment of the
718/// specified decl.  Note that bitfields do not have a valid alignment, so
719/// this method will assert on them.
720/// If @p RefAsPointee, references are treated like their underlying type
721/// (for alignof), else they're treated like pointers (for CodeGen).
722CharUnits ASTContext::getDeclAlign(const Decl *D, bool RefAsPointee) const {
723  unsigned Align = Target->getCharWidth();
724
725  bool UseAlignAttrOnly = false;
726  if (unsigned AlignFromAttr = D->getMaxAlignment()) {
727    Align = AlignFromAttr;
728
729    // __attribute__((aligned)) can increase or decrease alignment
730    // *except* on a struct or struct member, where it only increases
731    // alignment unless 'packed' is also specified.
732    //
733    // It is an error for alignas to decrease alignment, so we can
734    // ignore that possibility;  Sema should diagnose it.
735    if (isa<FieldDecl>(D)) {
736      UseAlignAttrOnly = D->hasAttr<PackedAttr>() ||
737        cast<FieldDecl>(D)->getParent()->hasAttr<PackedAttr>();
738    } else {
739      UseAlignAttrOnly = true;
740    }
741  }
742  else if (isa<FieldDecl>(D))
743      UseAlignAttrOnly =
744        D->hasAttr<PackedAttr>() ||
745        cast<FieldDecl>(D)->getParent()->hasAttr<PackedAttr>();
746
747  // If we're using the align attribute only, just ignore everything
748  // else about the declaration and its type.
749  if (UseAlignAttrOnly) {
750    // do nothing
751
752  } else if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
753    QualType T = VD->getType();
754    if (const ReferenceType* RT = T->getAs<ReferenceType>()) {
755      if (RefAsPointee)
756        T = RT->getPointeeType();
757      else
758        T = getPointerType(RT->getPointeeType());
759    }
760    if (!T->isIncompleteType() && !T->isFunctionType()) {
761      // Adjust alignments of declarations with array type by the
762      // large-array alignment on the target.
763      unsigned MinWidth = Target->getLargeArrayMinWidth();
764      const ArrayType *arrayType;
765      if (MinWidth && (arrayType = getAsArrayType(T))) {
766        if (isa<VariableArrayType>(arrayType))
767          Align = std::max(Align, Target->getLargeArrayAlign());
768        else if (isa<ConstantArrayType>(arrayType) &&
769                 MinWidth <= getTypeSize(cast<ConstantArrayType>(arrayType)))
770          Align = std::max(Align, Target->getLargeArrayAlign());
771
772        // Walk through any array types while we're at it.
773        T = getBaseElementType(arrayType);
774      }
775      Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr()));
776    }
777
778    // Fields can be subject to extra alignment constraints, like if
779    // the field is packed, the struct is packed, or the struct has a
780    // a max-field-alignment constraint (#pragma pack).  So calculate
781    // the actual alignment of the field within the struct, and then
782    // (as we're expected to) constrain that by the alignment of the type.
783    if (const FieldDecl *field = dyn_cast<FieldDecl>(VD)) {
784      // So calculate the alignment of the field.
785      const ASTRecordLayout &layout = getASTRecordLayout(field->getParent());
786
787      // Start with the record's overall alignment.
788      unsigned fieldAlign = toBits(layout.getAlignment());
789
790      // Use the GCD of that and the offset within the record.
791      uint64_t offset = layout.getFieldOffset(field->getFieldIndex());
792      if (offset > 0) {
793        // Alignment is always a power of 2, so the GCD will be a power of 2,
794        // which means we get to do this crazy thing instead of Euclid's.
795        uint64_t lowBitOfOffset = offset & (~offset + 1);
796        if (lowBitOfOffset < fieldAlign)
797          fieldAlign = static_cast<unsigned>(lowBitOfOffset);
798      }
799
800      Align = std::min(Align, fieldAlign);
801    }
802  }
803
804  return toCharUnitsFromBits(Align);
805}
806
807std::pair<CharUnits, CharUnits>
808ASTContext::getTypeInfoInChars(const Type *T) const {
809  std::pair<uint64_t, unsigned> Info = getTypeInfo(T);
810  return std::make_pair(toCharUnitsFromBits(Info.first),
811                        toCharUnitsFromBits(Info.second));
812}
813
814std::pair<CharUnits, CharUnits>
815ASTContext::getTypeInfoInChars(QualType T) const {
816  return getTypeInfoInChars(T.getTypePtr());
817}
818
819/// getTypeSize - Return the size of the specified type, in bits.  This method
820/// does not work on incomplete types.
821///
822/// FIXME: Pointers into different addr spaces could have different sizes and
823/// alignment requirements: getPointerInfo should take an AddrSpace, this
824/// should take a QualType, &c.
825std::pair<uint64_t, unsigned>
826ASTContext::getTypeInfo(const Type *T) const {
827  uint64_t Width=0;
828  unsigned Align=8;
829  switch (T->getTypeClass()) {
830#define TYPE(Class, Base)
831#define ABSTRACT_TYPE(Class, Base)
832#define NON_CANONICAL_TYPE(Class, Base)
833#define DEPENDENT_TYPE(Class, Base) case Type::Class:
834#include "clang/AST/TypeNodes.def"
835    llvm_unreachable("Should not see dependent types");
836
837  case Type::FunctionNoProto:
838  case Type::FunctionProto:
839    // GCC extension: alignof(function) = 32 bits
840    Width = 0;
841    Align = 32;
842    break;
843
844  case Type::IncompleteArray:
845  case Type::VariableArray:
846    Width = 0;
847    Align = getTypeAlign(cast<ArrayType>(T)->getElementType());
848    break;
849
850  case Type::ConstantArray: {
851    const ConstantArrayType *CAT = cast<ConstantArrayType>(T);
852
853    std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType());
854    uint64_t Size = CAT->getSize().getZExtValue();
855    assert((Size == 0 || EltInfo.first <= (uint64_t)(-1)/Size) && "Overflow in array type bit size evaluation");
856    Width = EltInfo.first*Size;
857    Align = EltInfo.second;
858    Width = llvm::RoundUpToAlignment(Width, Align);
859    break;
860  }
861  case Type::ExtVector:
862  case Type::Vector: {
863    const VectorType *VT = cast<VectorType>(T);
864    std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType());
865    Width = EltInfo.first*VT->getNumElements();
866    Align = Width;
867    // If the alignment is not a power of 2, round up to the next power of 2.
868    // This happens for non-power-of-2 length vectors.
869    if (Align & (Align-1)) {
870      Align = llvm::NextPowerOf2(Align);
871      Width = llvm::RoundUpToAlignment(Width, Align);
872    }
873    break;
874  }
875
876  case Type::Builtin:
877    switch (cast<BuiltinType>(T)->getKind()) {
878    default: llvm_unreachable("Unknown builtin type!");
879    case BuiltinType::Void:
880      // GCC extension: alignof(void) = 8 bits.
881      Width = 0;
882      Align = 8;
883      break;
884
885    case BuiltinType::Bool:
886      Width = Target->getBoolWidth();
887      Align = Target->getBoolAlign();
888      break;
889    case BuiltinType::Char_S:
890    case BuiltinType::Char_U:
891    case BuiltinType::UChar:
892    case BuiltinType::SChar:
893      Width = Target->getCharWidth();
894      Align = Target->getCharAlign();
895      break;
896    case BuiltinType::WChar_S:
897    case BuiltinType::WChar_U:
898      Width = Target->getWCharWidth();
899      Align = Target->getWCharAlign();
900      break;
901    case BuiltinType::Char16:
902      Width = Target->getChar16Width();
903      Align = Target->getChar16Align();
904      break;
905    case BuiltinType::Char32:
906      Width = Target->getChar32Width();
907      Align = Target->getChar32Align();
908      break;
909    case BuiltinType::UShort:
910    case BuiltinType::Short:
911      Width = Target->getShortWidth();
912      Align = Target->getShortAlign();
913      break;
914    case BuiltinType::UInt:
915    case BuiltinType::Int:
916      Width = Target->getIntWidth();
917      Align = Target->getIntAlign();
918      break;
919    case BuiltinType::ULong:
920    case BuiltinType::Long:
921      Width = Target->getLongWidth();
922      Align = Target->getLongAlign();
923      break;
924    case BuiltinType::ULongLong:
925    case BuiltinType::LongLong:
926      Width = Target->getLongLongWidth();
927      Align = Target->getLongLongAlign();
928      break;
929    case BuiltinType::Int128:
930    case BuiltinType::UInt128:
931      Width = 128;
932      Align = 128; // int128_t is 128-bit aligned on all targets.
933      break;
934    case BuiltinType::Half:
935      Width = Target->getHalfWidth();
936      Align = Target->getHalfAlign();
937      break;
938    case BuiltinType::Float:
939      Width = Target->getFloatWidth();
940      Align = Target->getFloatAlign();
941      break;
942    case BuiltinType::Double:
943      Width = Target->getDoubleWidth();
944      Align = Target->getDoubleAlign();
945      break;
946    case BuiltinType::LongDouble:
947      Width = Target->getLongDoubleWidth();
948      Align = Target->getLongDoubleAlign();
949      break;
950    case BuiltinType::NullPtr:
951      Width = Target->getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t)
952      Align = Target->getPointerAlign(0); //   == sizeof(void*)
953      break;
954    case BuiltinType::ObjCId:
955    case BuiltinType::ObjCClass:
956    case BuiltinType::ObjCSel:
957      Width = Target->getPointerWidth(0);
958      Align = Target->getPointerAlign(0);
959      break;
960    }
961    break;
962  case Type::ObjCObjectPointer:
963    Width = Target->getPointerWidth(0);
964    Align = Target->getPointerAlign(0);
965    break;
966  case Type::BlockPointer: {
967    unsigned AS = getTargetAddressSpace(
968        cast<BlockPointerType>(T)->getPointeeType());
969    Width = Target->getPointerWidth(AS);
970    Align = Target->getPointerAlign(AS);
971    break;
972  }
973  case Type::LValueReference:
974  case Type::RValueReference: {
975    // alignof and sizeof should never enter this code path here, so we go
976    // the pointer route.
977    unsigned AS = getTargetAddressSpace(
978        cast<ReferenceType>(T)->getPointeeType());
979    Width = Target->getPointerWidth(AS);
980    Align = Target->getPointerAlign(AS);
981    break;
982  }
983  case Type::Pointer: {
984    unsigned AS = getTargetAddressSpace(cast<PointerType>(T)->getPointeeType());
985    Width = Target->getPointerWidth(AS);
986    Align = Target->getPointerAlign(AS);
987    break;
988  }
989  case Type::MemberPointer: {
990    const MemberPointerType *MPT = cast<MemberPointerType>(T);
991    std::pair<uint64_t, unsigned> PtrDiffInfo =
992      getTypeInfo(getPointerDiffType());
993    Width = PtrDiffInfo.first * ABI->getMemberPointerSize(MPT);
994    Align = PtrDiffInfo.second;
995    break;
996  }
997  case Type::Complex: {
998    // Complex types have the same alignment as their elements, but twice the
999    // size.
1000    std::pair<uint64_t, unsigned> EltInfo =
1001      getTypeInfo(cast<ComplexType>(T)->getElementType());
1002    Width = EltInfo.first*2;
1003    Align = EltInfo.second;
1004    break;
1005  }
1006  case Type::ObjCObject:
1007    return getTypeInfo(cast<ObjCObjectType>(T)->getBaseType().getTypePtr());
1008  case Type::ObjCInterface: {
1009    const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T);
1010    const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl());
1011    Width = toBits(Layout.getSize());
1012    Align = toBits(Layout.getAlignment());
1013    break;
1014  }
1015  case Type::Record:
1016  case Type::Enum: {
1017    const TagType *TT = cast<TagType>(T);
1018
1019    if (TT->getDecl()->isInvalidDecl()) {
1020      Width = 8;
1021      Align = 8;
1022      break;
1023    }
1024
1025    if (const EnumType *ET = dyn_cast<EnumType>(TT))
1026      return getTypeInfo(ET->getDecl()->getIntegerType());
1027
1028    const RecordType *RT = cast<RecordType>(TT);
1029    const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl());
1030    Width = toBits(Layout.getSize());
1031    Align = toBits(Layout.getAlignment());
1032    break;
1033  }
1034
1035  case Type::SubstTemplateTypeParm:
1036    return getTypeInfo(cast<SubstTemplateTypeParmType>(T)->
1037                       getReplacementType().getTypePtr());
1038
1039  case Type::Auto: {
1040    const AutoType *A = cast<AutoType>(T);
1041    assert(A->isDeduced() && "Cannot request the size of a dependent type");
1042    return getTypeInfo(A->getDeducedType().getTypePtr());
1043  }
1044
1045  case Type::Paren:
1046    return getTypeInfo(cast<ParenType>(T)->getInnerType().getTypePtr());
1047
1048  case Type::Typedef: {
1049    const TypedefNameDecl *Typedef = cast<TypedefType>(T)->getDecl();
1050    std::pair<uint64_t, unsigned> Info
1051      = getTypeInfo(Typedef->getUnderlyingType().getTypePtr());
1052    // If the typedef has an aligned attribute on it, it overrides any computed
1053    // alignment we have.  This violates the GCC documentation (which says that
1054    // attribute(aligned) can only round up) but matches its implementation.
1055    if (unsigned AttrAlign = Typedef->getMaxAlignment())
1056      Align = AttrAlign;
1057    else
1058      Align = Info.second;
1059    Width = Info.first;
1060    break;
1061  }
1062
1063  case Type::TypeOfExpr:
1064    return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType()
1065                         .getTypePtr());
1066
1067  case Type::TypeOf:
1068    return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr());
1069
1070  case Type::Decltype:
1071    return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType()
1072                        .getTypePtr());
1073
1074  case Type::UnaryTransform:
1075    return getTypeInfo(cast<UnaryTransformType>(T)->getUnderlyingType());
1076
1077  case Type::Elaborated:
1078    return getTypeInfo(cast<ElaboratedType>(T)->getNamedType().getTypePtr());
1079
1080  case Type::Attributed:
1081    return getTypeInfo(
1082                  cast<AttributedType>(T)->getEquivalentType().getTypePtr());
1083
1084  case Type::TemplateSpecialization: {
1085    assert(getCanonicalType(T) != T &&
1086           "Cannot request the size of a dependent type");
1087    const TemplateSpecializationType *TST = cast<TemplateSpecializationType>(T);
1088    // A type alias template specialization may refer to a typedef with the
1089    // aligned attribute on it.
1090    if (TST->isTypeAlias())
1091      return getTypeInfo(TST->getAliasedType().getTypePtr());
1092    else
1093      return getTypeInfo(getCanonicalType(T));
1094  }
1095
1096  case Type::Atomic: {
1097    std::pair<uint64_t, unsigned> Info
1098      = getTypeInfo(cast<AtomicType>(T)->getValueType());
1099    Width = Info.first;
1100    Align = Info.second;
1101    if (Width != 0 && Width <= Target->getMaxAtomicPromoteWidth() &&
1102        llvm::isPowerOf2_64(Width)) {
1103      // We can potentially perform lock-free atomic operations for this
1104      // type; promote the alignment appropriately.
1105      // FIXME: We could potentially promote the width here as well...
1106      // is that worthwhile?  (Non-struct atomic types generally have
1107      // power-of-two size anyway, but structs might not.  Requires a bit
1108      // of implementation work to make sure we zero out the extra bits.)
1109      Align = static_cast<unsigned>(Width);
1110    }
1111  }
1112
1113  }
1114
1115  assert(llvm::isPowerOf2_32(Align) && "Alignment must be power of 2");
1116  return std::make_pair(Width, Align);
1117}
1118
1119/// toCharUnitsFromBits - Convert a size in bits to a size in characters.
1120CharUnits ASTContext::toCharUnitsFromBits(int64_t BitSize) const {
1121  return CharUnits::fromQuantity(BitSize / getCharWidth());
1122}
1123
1124/// toBits - Convert a size in characters to a size in characters.
1125int64_t ASTContext::toBits(CharUnits CharSize) const {
1126  return CharSize.getQuantity() * getCharWidth();
1127}
1128
1129/// getTypeSizeInChars - Return the size of the specified type, in characters.
1130/// This method does not work on incomplete types.
1131CharUnits ASTContext::getTypeSizeInChars(QualType T) const {
1132  return toCharUnitsFromBits(getTypeSize(T));
1133}
1134CharUnits ASTContext::getTypeSizeInChars(const Type *T) const {
1135  return toCharUnitsFromBits(getTypeSize(T));
1136}
1137
1138/// getTypeAlignInChars - Return the ABI-specified alignment of a type, in
1139/// characters. This method does not work on incomplete types.
1140CharUnits ASTContext::getTypeAlignInChars(QualType T) const {
1141  return toCharUnitsFromBits(getTypeAlign(T));
1142}
1143CharUnits ASTContext::getTypeAlignInChars(const Type *T) const {
1144  return toCharUnitsFromBits(getTypeAlign(T));
1145}
1146
1147/// getPreferredTypeAlign - Return the "preferred" alignment of the specified
1148/// type for the current target in bits.  This can be different than the ABI
1149/// alignment in cases where it is beneficial for performance to overalign
1150/// a data type.
1151unsigned ASTContext::getPreferredTypeAlign(const Type *T) const {
1152  unsigned ABIAlign = getTypeAlign(T);
1153
1154  // Double and long long should be naturally aligned if possible.
1155  if (const ComplexType* CT = T->getAs<ComplexType>())
1156    T = CT->getElementType().getTypePtr();
1157  if (T->isSpecificBuiltinType(BuiltinType::Double) ||
1158      T->isSpecificBuiltinType(BuiltinType::LongLong))
1159    return std::max(ABIAlign, (unsigned)getTypeSize(T));
1160
1161  return ABIAlign;
1162}
1163
1164/// DeepCollectObjCIvars -
1165/// This routine first collects all declared, but not synthesized, ivars in
1166/// super class and then collects all ivars, including those synthesized for
1167/// current class. This routine is used for implementation of current class
1168/// when all ivars, declared and synthesized are known.
1169///
1170void ASTContext::DeepCollectObjCIvars(const ObjCInterfaceDecl *OI,
1171                                      bool leafClass,
1172                            SmallVectorImpl<const ObjCIvarDecl*> &Ivars) const {
1173  if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass())
1174    DeepCollectObjCIvars(SuperClass, false, Ivars);
1175  if (!leafClass) {
1176    for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(),
1177         E = OI->ivar_end(); I != E; ++I)
1178      Ivars.push_back(*I);
1179  } else {
1180    ObjCInterfaceDecl *IDecl = const_cast<ObjCInterfaceDecl *>(OI);
1181    for (const ObjCIvarDecl *Iv = IDecl->all_declared_ivar_begin(); Iv;
1182         Iv= Iv->getNextIvar())
1183      Ivars.push_back(Iv);
1184  }
1185}
1186
1187/// CollectInheritedProtocols - Collect all protocols in current class and
1188/// those inherited by it.
1189void ASTContext::CollectInheritedProtocols(const Decl *CDecl,
1190                          llvm::SmallPtrSet<ObjCProtocolDecl*, 8> &Protocols) {
1191  if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) {
1192    // We can use protocol_iterator here instead of
1193    // all_referenced_protocol_iterator since we are walking all categories.
1194    for (ObjCInterfaceDecl::all_protocol_iterator P = OI->all_referenced_protocol_begin(),
1195         PE = OI->all_referenced_protocol_end(); P != PE; ++P) {
1196      ObjCProtocolDecl *Proto = (*P);
1197      Protocols.insert(Proto->getCanonicalDecl());
1198      for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(),
1199           PE = Proto->protocol_end(); P != PE; ++P) {
1200        Protocols.insert((*P)->getCanonicalDecl());
1201        CollectInheritedProtocols(*P, Protocols);
1202      }
1203    }
1204
1205    // Categories of this Interface.
1206    for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList();
1207         CDeclChain; CDeclChain = CDeclChain->getNextClassCategory())
1208      CollectInheritedProtocols(CDeclChain, Protocols);
1209    if (ObjCInterfaceDecl *SD = OI->getSuperClass())
1210      while (SD) {
1211        CollectInheritedProtocols(SD, Protocols);
1212        SD = SD->getSuperClass();
1213      }
1214  } else if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) {
1215    for (ObjCCategoryDecl::protocol_iterator P = OC->protocol_begin(),
1216         PE = OC->protocol_end(); P != PE; ++P) {
1217      ObjCProtocolDecl *Proto = (*P);
1218      Protocols.insert(Proto->getCanonicalDecl());
1219      for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(),
1220           PE = Proto->protocol_end(); P != PE; ++P)
1221        CollectInheritedProtocols(*P, Protocols);
1222    }
1223  } else if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) {
1224    for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(),
1225         PE = OP->protocol_end(); P != PE; ++P) {
1226      ObjCProtocolDecl *Proto = (*P);
1227      Protocols.insert(Proto->getCanonicalDecl());
1228      for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(),
1229           PE = Proto->protocol_end(); P != PE; ++P)
1230        CollectInheritedProtocols(*P, Protocols);
1231    }
1232  }
1233}
1234
1235unsigned ASTContext::CountNonClassIvars(const ObjCInterfaceDecl *OI) const {
1236  unsigned count = 0;
1237  // Count ivars declared in class extension.
1238  for (const ObjCCategoryDecl *CDecl = OI->getFirstClassExtension(); CDecl;
1239       CDecl = CDecl->getNextClassExtension())
1240    count += CDecl->ivar_size();
1241
1242  // Count ivar defined in this class's implementation.  This
1243  // includes synthesized ivars.
1244  if (ObjCImplementationDecl *ImplDecl = OI->getImplementation())
1245    count += ImplDecl->ivar_size();
1246
1247  return count;
1248}
1249
1250bool ASTContext::isSentinelNullExpr(const Expr *E) {
1251  if (!E)
1252    return false;
1253
1254  // nullptr_t is always treated as null.
1255  if (E->getType()->isNullPtrType()) return true;
1256
1257  if (E->getType()->isAnyPointerType() &&
1258      E->IgnoreParenCasts()->isNullPointerConstant(*this,
1259                                                Expr::NPC_ValueDependentIsNull))
1260    return true;
1261
1262  // Unfortunately, __null has type 'int'.
1263  if (isa<GNUNullExpr>(E)) return true;
1264
1265  return false;
1266}
1267
1268/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists.
1269ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) {
1270  llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator
1271    I = ObjCImpls.find(D);
1272  if (I != ObjCImpls.end())
1273    return cast<ObjCImplementationDecl>(I->second);
1274  return 0;
1275}
1276/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists.
1277ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) {
1278  llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator
1279    I = ObjCImpls.find(D);
1280  if (I != ObjCImpls.end())
1281    return cast<ObjCCategoryImplDecl>(I->second);
1282  return 0;
1283}
1284
1285/// \brief Set the implementation of ObjCInterfaceDecl.
1286void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD,
1287                           ObjCImplementationDecl *ImplD) {
1288  assert(IFaceD && ImplD && "Passed null params");
1289  ObjCImpls[IFaceD] = ImplD;
1290}
1291/// \brief Set the implementation of ObjCCategoryDecl.
1292void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD,
1293                           ObjCCategoryImplDecl *ImplD) {
1294  assert(CatD && ImplD && "Passed null params");
1295  ObjCImpls[CatD] = ImplD;
1296}
1297
1298ObjCInterfaceDecl *ASTContext::getObjContainingInterface(NamedDecl *ND) const {
1299  if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(ND->getDeclContext()))
1300    return ID;
1301  if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(ND->getDeclContext()))
1302    return CD->getClassInterface();
1303  if (ObjCImplDecl *IMD = dyn_cast<ObjCImplDecl>(ND->getDeclContext()))
1304    return IMD->getClassInterface();
1305
1306  return 0;
1307}
1308
1309/// \brief Get the copy initialization expression of VarDecl,or NULL if
1310/// none exists.
1311Expr *ASTContext::getBlockVarCopyInits(const VarDecl*VD) {
1312  assert(VD && "Passed null params");
1313  assert(VD->hasAttr<BlocksAttr>() &&
1314         "getBlockVarCopyInits - not __block var");
1315  llvm::DenseMap<const VarDecl*, Expr*>::iterator
1316    I = BlockVarCopyInits.find(VD);
1317  return (I != BlockVarCopyInits.end()) ? cast<Expr>(I->second) : 0;
1318}
1319
1320/// \brief Set the copy inialization expression of a block var decl.
1321void ASTContext::setBlockVarCopyInits(VarDecl*VD, Expr* Init) {
1322  assert(VD && Init && "Passed null params");
1323  assert(VD->hasAttr<BlocksAttr>() &&
1324         "setBlockVarCopyInits - not __block var");
1325  BlockVarCopyInits[VD] = Init;
1326}
1327
1328/// \brief Allocate an uninitialized TypeSourceInfo.
1329///
1330/// The caller should initialize the memory held by TypeSourceInfo using
1331/// the TypeLoc wrappers.
1332///
1333/// \param T the type that will be the basis for type source info. This type
1334/// should refer to how the declarator was written in source code, not to
1335/// what type semantic analysis resolved the declarator to.
1336TypeSourceInfo *ASTContext::CreateTypeSourceInfo(QualType T,
1337                                                 unsigned DataSize) const {
1338  if (!DataSize)
1339    DataSize = TypeLoc::getFullDataSizeForType(T);
1340  else
1341    assert(DataSize == TypeLoc::getFullDataSizeForType(T) &&
1342           "incorrect data size provided to CreateTypeSourceInfo!");
1343
1344  TypeSourceInfo *TInfo =
1345    (TypeSourceInfo*)BumpAlloc.Allocate(sizeof(TypeSourceInfo) + DataSize, 8);
1346  new (TInfo) TypeSourceInfo(T);
1347  return TInfo;
1348}
1349
1350TypeSourceInfo *ASTContext::getTrivialTypeSourceInfo(QualType T,
1351                                                     SourceLocation L) const {
1352  TypeSourceInfo *DI = CreateTypeSourceInfo(T);
1353  DI->getTypeLoc().initialize(const_cast<ASTContext &>(*this), L);
1354  return DI;
1355}
1356
1357const ASTRecordLayout &
1358ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) const {
1359  return getObjCLayout(D, 0);
1360}
1361
1362const ASTRecordLayout &
1363ASTContext::getASTObjCImplementationLayout(
1364                                        const ObjCImplementationDecl *D) const {
1365  return getObjCLayout(D->getClassInterface(), D);
1366}
1367
1368//===----------------------------------------------------------------------===//
1369//                   Type creation/memoization methods
1370//===----------------------------------------------------------------------===//
1371
1372QualType
1373ASTContext::getExtQualType(const Type *baseType, Qualifiers quals) const {
1374  unsigned fastQuals = quals.getFastQualifiers();
1375  quals.removeFastQualifiers();
1376
1377  // Check if we've already instantiated this type.
1378  llvm::FoldingSetNodeID ID;
1379  ExtQuals::Profile(ID, baseType, quals);
1380  void *insertPos = 0;
1381  if (ExtQuals *eq = ExtQualNodes.FindNodeOrInsertPos(ID, insertPos)) {
1382    assert(eq->getQualifiers() == quals);
1383    return QualType(eq, fastQuals);
1384  }
1385
1386  // If the base type is not canonical, make the appropriate canonical type.
1387  QualType canon;
1388  if (!baseType->isCanonicalUnqualified()) {
1389    SplitQualType canonSplit = baseType->getCanonicalTypeInternal().split();
1390    canonSplit.Quals.addConsistentQualifiers(quals);
1391    canon = getExtQualType(canonSplit.Ty, canonSplit.Quals);
1392
1393    // Re-find the insert position.
1394    (void) ExtQualNodes.FindNodeOrInsertPos(ID, insertPos);
1395  }
1396
1397  ExtQuals *eq = new (*this, TypeAlignment) ExtQuals(baseType, canon, quals);
1398  ExtQualNodes.InsertNode(eq, insertPos);
1399  return QualType(eq, fastQuals);
1400}
1401
1402QualType
1403ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) const {
1404  QualType CanT = getCanonicalType(T);
1405  if (CanT.getAddressSpace() == AddressSpace)
1406    return T;
1407
1408  // If we are composing extended qualifiers together, merge together
1409  // into one ExtQuals node.
1410  QualifierCollector Quals;
1411  const Type *TypeNode = Quals.strip(T);
1412
1413  // If this type already has an address space specified, it cannot get
1414  // another one.
1415  assert(!Quals.hasAddressSpace() &&
1416         "Type cannot be in multiple addr spaces!");
1417  Quals.addAddressSpace(AddressSpace);
1418
1419  return getExtQualType(TypeNode, Quals);
1420}
1421
1422QualType ASTContext::getObjCGCQualType(QualType T,
1423                                       Qualifiers::GC GCAttr) const {
1424  QualType CanT = getCanonicalType(T);
1425  if (CanT.getObjCGCAttr() == GCAttr)
1426    return T;
1427
1428  if (const PointerType *ptr = T->getAs<PointerType>()) {
1429    QualType Pointee = ptr->getPointeeType();
1430    if (Pointee->isAnyPointerType()) {
1431      QualType ResultType = getObjCGCQualType(Pointee, GCAttr);
1432      return getPointerType(ResultType);
1433    }
1434  }
1435
1436  // If we are composing extended qualifiers together, merge together
1437  // into one ExtQuals node.
1438  QualifierCollector Quals;
1439  const Type *TypeNode = Quals.strip(T);
1440
1441  // If this type already has an ObjCGC specified, it cannot get
1442  // another one.
1443  assert(!Quals.hasObjCGCAttr() &&
1444         "Type cannot have multiple ObjCGCs!");
1445  Quals.addObjCGCAttr(GCAttr);
1446
1447  return getExtQualType(TypeNode, Quals);
1448}
1449
1450const FunctionType *ASTContext::adjustFunctionType(const FunctionType *T,
1451                                                   FunctionType::ExtInfo Info) {
1452  if (T->getExtInfo() == Info)
1453    return T;
1454
1455  QualType Result;
1456  if (const FunctionNoProtoType *FNPT = dyn_cast<FunctionNoProtoType>(T)) {
1457    Result = getFunctionNoProtoType(FNPT->getResultType(), Info);
1458  } else {
1459    const FunctionProtoType *FPT = cast<FunctionProtoType>(T);
1460    FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
1461    EPI.ExtInfo = Info;
1462    Result = getFunctionType(FPT->getResultType(), FPT->arg_type_begin(),
1463                             FPT->getNumArgs(), EPI);
1464  }
1465
1466  return cast<FunctionType>(Result.getTypePtr());
1467}
1468
1469/// getComplexType - Return the uniqued reference to the type for a complex
1470/// number with the specified element type.
1471QualType ASTContext::getComplexType(QualType T) const {
1472  // Unique pointers, to guarantee there is only one pointer of a particular
1473  // structure.
1474  llvm::FoldingSetNodeID ID;
1475  ComplexType::Profile(ID, T);
1476
1477  void *InsertPos = 0;
1478  if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos))
1479    return QualType(CT, 0);
1480
1481  // If the pointee type isn't canonical, this won't be a canonical type either,
1482  // so fill in the canonical type field.
1483  QualType Canonical;
1484  if (!T.isCanonical()) {
1485    Canonical = getComplexType(getCanonicalType(T));
1486
1487    // Get the new insert position for the node we care about.
1488    ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos);
1489    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
1490  }
1491  ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical);
1492  Types.push_back(New);
1493  ComplexTypes.InsertNode(New, InsertPos);
1494  return QualType(New, 0);
1495}
1496
1497/// getPointerType - Return the uniqued reference to the type for a pointer to
1498/// the specified type.
1499QualType ASTContext::getPointerType(QualType T) const {
1500  // Unique pointers, to guarantee there is only one pointer of a particular
1501  // structure.
1502  llvm::FoldingSetNodeID ID;
1503  PointerType::Profile(ID, T);
1504
1505  void *InsertPos = 0;
1506  if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos))
1507    return QualType(PT, 0);
1508
1509  // If the pointee type isn't canonical, this won't be a canonical type either,
1510  // so fill in the canonical type field.
1511  QualType Canonical;
1512  if (!T.isCanonical()) {
1513    Canonical = getPointerType(getCanonicalType(T));
1514
1515    // Get the new insert position for the node we care about.
1516    PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos);
1517    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
1518  }
1519  PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical);
1520  Types.push_back(New);
1521  PointerTypes.InsertNode(New, InsertPos);
1522  return QualType(New, 0);
1523}
1524
1525/// getBlockPointerType - Return the uniqued reference to the type for
1526/// a pointer to the specified block.
1527QualType ASTContext::getBlockPointerType(QualType T) const {
1528  assert(T->isFunctionType() && "block of function types only");
1529  // Unique pointers, to guarantee there is only one block of a particular
1530  // structure.
1531  llvm::FoldingSetNodeID ID;
1532  BlockPointerType::Profile(ID, T);
1533
1534  void *InsertPos = 0;
1535  if (BlockPointerType *PT =
1536        BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos))
1537    return QualType(PT, 0);
1538
1539  // If the block pointee type isn't canonical, this won't be a canonical
1540  // type either so fill in the canonical type field.
1541  QualType Canonical;
1542  if (!T.isCanonical()) {
1543    Canonical = getBlockPointerType(getCanonicalType(T));
1544
1545    // Get the new insert position for the node we care about.
1546    BlockPointerType *NewIP =
1547      BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos);
1548    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
1549  }
1550  BlockPointerType *New
1551    = new (*this, TypeAlignment) BlockPointerType(T, Canonical);
1552  Types.push_back(New);
1553  BlockPointerTypes.InsertNode(New, InsertPos);
1554  return QualType(New, 0);
1555}
1556
1557/// getLValueReferenceType - Return the uniqued reference to the type for an
1558/// lvalue reference to the specified type.
1559QualType
1560ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) const {
1561  assert(getCanonicalType(T) != OverloadTy &&
1562         "Unresolved overloaded function type");
1563
1564  // Unique pointers, to guarantee there is only one pointer of a particular
1565  // structure.
1566  llvm::FoldingSetNodeID ID;
1567  ReferenceType::Profile(ID, T, SpelledAsLValue);
1568
1569  void *InsertPos = 0;
1570  if (LValueReferenceType *RT =
1571        LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos))
1572    return QualType(RT, 0);
1573
1574  const ReferenceType *InnerRef = T->getAs<ReferenceType>();
1575
1576  // If the referencee type isn't canonical, this won't be a canonical type
1577  // either, so fill in the canonical type field.
1578  QualType Canonical;
1579  if (!SpelledAsLValue || InnerRef || !T.isCanonical()) {
1580    QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T);
1581    Canonical = getLValueReferenceType(getCanonicalType(PointeeType));
1582
1583    // Get the new insert position for the node we care about.
1584    LValueReferenceType *NewIP =
1585      LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos);
1586    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
1587  }
1588
1589  LValueReferenceType *New
1590    = new (*this, TypeAlignment) LValueReferenceType(T, Canonical,
1591                                                     SpelledAsLValue);
1592  Types.push_back(New);
1593  LValueReferenceTypes.InsertNode(New, InsertPos);
1594
1595  return QualType(New, 0);
1596}
1597
1598/// getRValueReferenceType - Return the uniqued reference to the type for an
1599/// rvalue reference to the specified type.
1600QualType ASTContext::getRValueReferenceType(QualType T) const {
1601  // Unique pointers, to guarantee there is only one pointer of a particular
1602  // structure.
1603  llvm::FoldingSetNodeID ID;
1604  ReferenceType::Profile(ID, T, false);
1605
1606  void *InsertPos = 0;
1607  if (RValueReferenceType *RT =
1608        RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos))
1609    return QualType(RT, 0);
1610
1611  const ReferenceType *InnerRef = T->getAs<ReferenceType>();
1612
1613  // If the referencee type isn't canonical, this won't be a canonical type
1614  // either, so fill in the canonical type field.
1615  QualType Canonical;
1616  if (InnerRef || !T.isCanonical()) {
1617    QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T);
1618    Canonical = getRValueReferenceType(getCanonicalType(PointeeType));
1619
1620    // Get the new insert position for the node we care about.
1621    RValueReferenceType *NewIP =
1622      RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos);
1623    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
1624  }
1625
1626  RValueReferenceType *New
1627    = new (*this, TypeAlignment) RValueReferenceType(T, Canonical);
1628  Types.push_back(New);
1629  RValueReferenceTypes.InsertNode(New, InsertPos);
1630  return QualType(New, 0);
1631}
1632
1633/// getMemberPointerType - Return the uniqued reference to the type for a
1634/// member pointer to the specified type, in the specified class.
1635QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) const {
1636  // Unique pointers, to guarantee there is only one pointer of a particular
1637  // structure.
1638  llvm::FoldingSetNodeID ID;
1639  MemberPointerType::Profile(ID, T, Cls);
1640
1641  void *InsertPos = 0;
1642  if (MemberPointerType *PT =
1643      MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos))
1644    return QualType(PT, 0);
1645
1646  // If the pointee or class type isn't canonical, this won't be a canonical
1647  // type either, so fill in the canonical type field.
1648  QualType Canonical;
1649  if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) {
1650    Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls));
1651
1652    // Get the new insert position for the node we care about.
1653    MemberPointerType *NewIP =
1654      MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos);
1655    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
1656  }
1657  MemberPointerType *New
1658    = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical);
1659  Types.push_back(New);
1660  MemberPointerTypes.InsertNode(New, InsertPos);
1661  return QualType(New, 0);
1662}
1663
1664/// getConstantArrayType - Return the unique reference to the type for an
1665/// array of the specified element type.
1666QualType ASTContext::getConstantArrayType(QualType EltTy,
1667                                          const llvm::APInt &ArySizeIn,
1668                                          ArrayType::ArraySizeModifier ASM,
1669                                          unsigned IndexTypeQuals) const {
1670  assert((EltTy->isDependentType() ||
1671          EltTy->isIncompleteType() || EltTy->isConstantSizeType()) &&
1672         "Constant array of VLAs is illegal!");
1673
1674  // Convert the array size into a canonical width matching the pointer size for
1675  // the target.
1676  llvm::APInt ArySize(ArySizeIn);
1677  ArySize =
1678    ArySize.zextOrTrunc(Target->getPointerWidth(getTargetAddressSpace(EltTy)));
1679
1680  llvm::FoldingSetNodeID ID;
1681  ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, IndexTypeQuals);
1682
1683  void *InsertPos = 0;
1684  if (ConstantArrayType *ATP =
1685      ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos))
1686    return QualType(ATP, 0);
1687
1688  // If the element type isn't canonical or has qualifiers, this won't
1689  // be a canonical type either, so fill in the canonical type field.
1690  QualType Canon;
1691  if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) {
1692    SplitQualType canonSplit = getCanonicalType(EltTy).split();
1693    Canon = getConstantArrayType(QualType(canonSplit.Ty, 0), ArySize,
1694                                 ASM, IndexTypeQuals);
1695    Canon = getQualifiedType(Canon, canonSplit.Quals);
1696
1697    // Get the new insert position for the node we care about.
1698    ConstantArrayType *NewIP =
1699      ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos);
1700    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
1701  }
1702
1703  ConstantArrayType *New = new(*this,TypeAlignment)
1704    ConstantArrayType(EltTy, Canon, ArySize, ASM, IndexTypeQuals);
1705  ConstantArrayTypes.InsertNode(New, InsertPos);
1706  Types.push_back(New);
1707  return QualType(New, 0);
1708}
1709
1710/// getVariableArrayDecayedType - Turns the given type, which may be
1711/// variably-modified, into the corresponding type with all the known
1712/// sizes replaced with [*].
1713QualType ASTContext::getVariableArrayDecayedType(QualType type) const {
1714  // Vastly most common case.
1715  if (!type->isVariablyModifiedType()) return type;
1716
1717  QualType result;
1718
1719  SplitQualType split = type.getSplitDesugaredType();
1720  const Type *ty = split.Ty;
1721  switch (ty->getTypeClass()) {
1722#define TYPE(Class, Base)
1723#define ABSTRACT_TYPE(Class, Base)
1724#define NON_CANONICAL_TYPE(Class, Base) case Type::Class:
1725#include "clang/AST/TypeNodes.def"
1726    llvm_unreachable("didn't desugar past all non-canonical types?");
1727
1728  // These types should never be variably-modified.
1729  case Type::Builtin:
1730  case Type::Complex:
1731  case Type::Vector:
1732  case Type::ExtVector:
1733  case Type::DependentSizedExtVector:
1734  case Type::ObjCObject:
1735  case Type::ObjCInterface:
1736  case Type::ObjCObjectPointer:
1737  case Type::Record:
1738  case Type::Enum:
1739  case Type::UnresolvedUsing:
1740  case Type::TypeOfExpr:
1741  case Type::TypeOf:
1742  case Type::Decltype:
1743  case Type::UnaryTransform:
1744  case Type::DependentName:
1745  case Type::InjectedClassName:
1746  case Type::TemplateSpecialization:
1747  case Type::DependentTemplateSpecialization:
1748  case Type::TemplateTypeParm:
1749  case Type::SubstTemplateTypeParmPack:
1750  case Type::Auto:
1751  case Type::PackExpansion:
1752    llvm_unreachable("type should never be variably-modified");
1753
1754  // These types can be variably-modified but should never need to
1755  // further decay.
1756  case Type::FunctionNoProto:
1757  case Type::FunctionProto:
1758  case Type::BlockPointer:
1759  case Type::MemberPointer:
1760    return type;
1761
1762  // These types can be variably-modified.  All these modifications
1763  // preserve structure except as noted by comments.
1764  // TODO: if we ever care about optimizing VLAs, there are no-op
1765  // optimizations available here.
1766  case Type::Pointer:
1767    result = getPointerType(getVariableArrayDecayedType(
1768                              cast<PointerType>(ty)->getPointeeType()));
1769    break;
1770
1771  case Type::LValueReference: {
1772    const LValueReferenceType *lv = cast<LValueReferenceType>(ty);
1773    result = getLValueReferenceType(
1774                 getVariableArrayDecayedType(lv->getPointeeType()),
1775                                    lv->isSpelledAsLValue());
1776    break;
1777  }
1778
1779  case Type::RValueReference: {
1780    const RValueReferenceType *lv = cast<RValueReferenceType>(ty);
1781    result = getRValueReferenceType(
1782                 getVariableArrayDecayedType(lv->getPointeeType()));
1783    break;
1784  }
1785
1786  case Type::Atomic: {
1787    const AtomicType *at = cast<AtomicType>(ty);
1788    result = getAtomicType(getVariableArrayDecayedType(at->getValueType()));
1789    break;
1790  }
1791
1792  case Type::ConstantArray: {
1793    const ConstantArrayType *cat = cast<ConstantArrayType>(ty);
1794    result = getConstantArrayType(
1795                 getVariableArrayDecayedType(cat->getElementType()),
1796                                  cat->getSize(),
1797                                  cat->getSizeModifier(),
1798                                  cat->getIndexTypeCVRQualifiers());
1799    break;
1800  }
1801
1802  case Type::DependentSizedArray: {
1803    const DependentSizedArrayType *dat = cast<DependentSizedArrayType>(ty);
1804    result = getDependentSizedArrayType(
1805                 getVariableArrayDecayedType(dat->getElementType()),
1806                                        dat->getSizeExpr(),
1807                                        dat->getSizeModifier(),
1808                                        dat->getIndexTypeCVRQualifiers(),
1809                                        dat->getBracketsRange());
1810    break;
1811  }
1812
1813  // Turn incomplete types into [*] types.
1814  case Type::IncompleteArray: {
1815    const IncompleteArrayType *iat = cast<IncompleteArrayType>(ty);
1816    result = getVariableArrayType(
1817                 getVariableArrayDecayedType(iat->getElementType()),
1818                                  /*size*/ 0,
1819                                  ArrayType::Normal,
1820                                  iat->getIndexTypeCVRQualifiers(),
1821                                  SourceRange());
1822    break;
1823  }
1824
1825  // Turn VLA types into [*] types.
1826  case Type::VariableArray: {
1827    const VariableArrayType *vat = cast<VariableArrayType>(ty);
1828    result = getVariableArrayType(
1829                 getVariableArrayDecayedType(vat->getElementType()),
1830                                  /*size*/ 0,
1831                                  ArrayType::Star,
1832                                  vat->getIndexTypeCVRQualifiers(),
1833                                  vat->getBracketsRange());
1834    break;
1835  }
1836  }
1837
1838  // Apply the top-level qualifiers from the original.
1839  return getQualifiedType(result, split.Quals);
1840}
1841
1842/// getVariableArrayType - Returns a non-unique reference to the type for a
1843/// variable array of the specified element type.
1844QualType ASTContext::getVariableArrayType(QualType EltTy,
1845                                          Expr *NumElts,
1846                                          ArrayType::ArraySizeModifier ASM,
1847                                          unsigned IndexTypeQuals,
1848                                          SourceRange Brackets) const {
1849  // Since we don't unique expressions, it isn't possible to unique VLA's
1850  // that have an expression provided for their size.
1851  QualType Canon;
1852
1853  // Be sure to pull qualifiers off the element type.
1854  if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) {
1855    SplitQualType canonSplit = getCanonicalType(EltTy).split();
1856    Canon = getVariableArrayType(QualType(canonSplit.Ty, 0), NumElts, ASM,
1857                                 IndexTypeQuals, Brackets);
1858    Canon = getQualifiedType(Canon, canonSplit.Quals);
1859  }
1860
1861  VariableArrayType *New = new(*this, TypeAlignment)
1862    VariableArrayType(EltTy, Canon, NumElts, ASM, IndexTypeQuals, Brackets);
1863
1864  VariableArrayTypes.push_back(New);
1865  Types.push_back(New);
1866  return QualType(New, 0);
1867}
1868
1869/// getDependentSizedArrayType - Returns a non-unique reference to
1870/// the type for a dependently-sized array of the specified element
1871/// type.
1872QualType ASTContext::getDependentSizedArrayType(QualType elementType,
1873                                                Expr *numElements,
1874                                                ArrayType::ArraySizeModifier ASM,
1875                                                unsigned elementTypeQuals,
1876                                                SourceRange brackets) const {
1877  assert((!numElements || numElements->isTypeDependent() ||
1878          numElements->isValueDependent()) &&
1879         "Size must be type- or value-dependent!");
1880
1881  // Dependently-sized array types that do not have a specified number
1882  // of elements will have their sizes deduced from a dependent
1883  // initializer.  We do no canonicalization here at all, which is okay
1884  // because they can't be used in most locations.
1885  if (!numElements) {
1886    DependentSizedArrayType *newType
1887      = new (*this, TypeAlignment)
1888          DependentSizedArrayType(*this, elementType, QualType(),
1889                                  numElements, ASM, elementTypeQuals,
1890                                  brackets);
1891    Types.push_back(newType);
1892    return QualType(newType, 0);
1893  }
1894
1895  // Otherwise, we actually build a new type every time, but we
1896  // also build a canonical type.
1897
1898  SplitQualType canonElementType = getCanonicalType(elementType).split();
1899
1900  void *insertPos = 0;
1901  llvm::FoldingSetNodeID ID;
1902  DependentSizedArrayType::Profile(ID, *this,
1903                                   QualType(canonElementType.Ty, 0),
1904                                   ASM, elementTypeQuals, numElements);
1905
1906  // Look for an existing type with these properties.
1907  DependentSizedArrayType *canonTy =
1908    DependentSizedArrayTypes.FindNodeOrInsertPos(ID, insertPos);
1909
1910  // If we don't have one, build one.
1911  if (!canonTy) {
1912    canonTy = new (*this, TypeAlignment)
1913      DependentSizedArrayType(*this, QualType(canonElementType.Ty, 0),
1914                              QualType(), numElements, ASM, elementTypeQuals,
1915                              brackets);
1916    DependentSizedArrayTypes.InsertNode(canonTy, insertPos);
1917    Types.push_back(canonTy);
1918  }
1919
1920  // Apply qualifiers from the element type to the array.
1921  QualType canon = getQualifiedType(QualType(canonTy,0),
1922                                    canonElementType.Quals);
1923
1924  // If we didn't need extra canonicalization for the element type,
1925  // then just use that as our result.
1926  if (QualType(canonElementType.Ty, 0) == elementType)
1927    return canon;
1928
1929  // Otherwise, we need to build a type which follows the spelling
1930  // of the element type.
1931  DependentSizedArrayType *sugaredType
1932    = new (*this, TypeAlignment)
1933        DependentSizedArrayType(*this, elementType, canon, numElements,
1934                                ASM, elementTypeQuals, brackets);
1935  Types.push_back(sugaredType);
1936  return QualType(sugaredType, 0);
1937}
1938
1939QualType ASTContext::getIncompleteArrayType(QualType elementType,
1940                                            ArrayType::ArraySizeModifier ASM,
1941                                            unsigned elementTypeQuals) const {
1942  llvm::FoldingSetNodeID ID;
1943  IncompleteArrayType::Profile(ID, elementType, ASM, elementTypeQuals);
1944
1945  void *insertPos = 0;
1946  if (IncompleteArrayType *iat =
1947       IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos))
1948    return QualType(iat, 0);
1949
1950  // If the element type isn't canonical, this won't be a canonical type
1951  // either, so fill in the canonical type field.  We also have to pull
1952  // qualifiers off the element type.
1953  QualType canon;
1954
1955  if (!elementType.isCanonical() || elementType.hasLocalQualifiers()) {
1956    SplitQualType canonSplit = getCanonicalType(elementType).split();
1957    canon = getIncompleteArrayType(QualType(canonSplit.Ty, 0),
1958                                   ASM, elementTypeQuals);
1959    canon = getQualifiedType(canon, canonSplit.Quals);
1960
1961    // Get the new insert position for the node we care about.
1962    IncompleteArrayType *existing =
1963      IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos);
1964    assert(!existing && "Shouldn't be in the map!"); (void) existing;
1965  }
1966
1967  IncompleteArrayType *newType = new (*this, TypeAlignment)
1968    IncompleteArrayType(elementType, canon, ASM, elementTypeQuals);
1969
1970  IncompleteArrayTypes.InsertNode(newType, insertPos);
1971  Types.push_back(newType);
1972  return QualType(newType, 0);
1973}
1974
1975/// getVectorType - Return the unique reference to a vector type of
1976/// the specified element type and size. VectorType must be a built-in type.
1977QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts,
1978                                   VectorType::VectorKind VecKind) const {
1979  assert(vecType->isBuiltinType());
1980
1981  // Check if we've already instantiated a vector of this type.
1982  llvm::FoldingSetNodeID ID;
1983  VectorType::Profile(ID, vecType, NumElts, Type::Vector, VecKind);
1984
1985  void *InsertPos = 0;
1986  if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos))
1987    return QualType(VTP, 0);
1988
1989  // If the element type isn't canonical, this won't be a canonical type either,
1990  // so fill in the canonical type field.
1991  QualType Canonical;
1992  if (!vecType.isCanonical()) {
1993    Canonical = getVectorType(getCanonicalType(vecType), NumElts, VecKind);
1994
1995    // Get the new insert position for the node we care about.
1996    VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos);
1997    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
1998  }
1999  VectorType *New = new (*this, TypeAlignment)
2000    VectorType(vecType, NumElts, Canonical, VecKind);
2001  VectorTypes.InsertNode(New, InsertPos);
2002  Types.push_back(New);
2003  return QualType(New, 0);
2004}
2005
2006/// getExtVectorType - Return the unique reference to an extended vector type of
2007/// the specified element type and size. VectorType must be a built-in type.
2008QualType
2009ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) const {
2010  assert(vecType->isBuiltinType() || vecType->isDependentType());
2011
2012  // Check if we've already instantiated a vector of this type.
2013  llvm::FoldingSetNodeID ID;
2014  VectorType::Profile(ID, vecType, NumElts, Type::ExtVector,
2015                      VectorType::GenericVector);
2016  void *InsertPos = 0;
2017  if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos))
2018    return QualType(VTP, 0);
2019
2020  // If the element type isn't canonical, this won't be a canonical type either,
2021  // so fill in the canonical type field.
2022  QualType Canonical;
2023  if (!vecType.isCanonical()) {
2024    Canonical = getExtVectorType(getCanonicalType(vecType), NumElts);
2025
2026    // Get the new insert position for the node we care about.
2027    VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos);
2028    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
2029  }
2030  ExtVectorType *New = new (*this, TypeAlignment)
2031    ExtVectorType(vecType, NumElts, Canonical);
2032  VectorTypes.InsertNode(New, InsertPos);
2033  Types.push_back(New);
2034  return QualType(New, 0);
2035}
2036
2037QualType
2038ASTContext::getDependentSizedExtVectorType(QualType vecType,
2039                                           Expr *SizeExpr,
2040                                           SourceLocation AttrLoc) const {
2041  llvm::FoldingSetNodeID ID;
2042  DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType),
2043                                       SizeExpr);
2044
2045  void *InsertPos = 0;
2046  DependentSizedExtVectorType *Canon
2047    = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos);
2048  DependentSizedExtVectorType *New;
2049  if (Canon) {
2050    // We already have a canonical version of this array type; use it as
2051    // the canonical type for a newly-built type.
2052    New = new (*this, TypeAlignment)
2053      DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0),
2054                                  SizeExpr, AttrLoc);
2055  } else {
2056    QualType CanonVecTy = getCanonicalType(vecType);
2057    if (CanonVecTy == vecType) {
2058      New = new (*this, TypeAlignment)
2059        DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr,
2060                                    AttrLoc);
2061
2062      DependentSizedExtVectorType *CanonCheck
2063        = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos);
2064      assert(!CanonCheck && "Dependent-sized ext_vector canonical type broken");
2065      (void)CanonCheck;
2066      DependentSizedExtVectorTypes.InsertNode(New, InsertPos);
2067    } else {
2068      QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr,
2069                                                      SourceLocation());
2070      New = new (*this, TypeAlignment)
2071        DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc);
2072    }
2073  }
2074
2075  Types.push_back(New);
2076  return QualType(New, 0);
2077}
2078
2079/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'.
2080///
2081QualType
2082ASTContext::getFunctionNoProtoType(QualType ResultTy,
2083                                   const FunctionType::ExtInfo &Info) const {
2084  const CallingConv DefaultCC = Info.getCC();
2085  const CallingConv CallConv = (LangOpts.MRTD && DefaultCC == CC_Default) ?
2086                               CC_X86StdCall : DefaultCC;
2087  // Unique functions, to guarantee there is only one function of a particular
2088  // structure.
2089  llvm::FoldingSetNodeID ID;
2090  FunctionNoProtoType::Profile(ID, ResultTy, Info);
2091
2092  void *InsertPos = 0;
2093  if (FunctionNoProtoType *FT =
2094        FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos))
2095    return QualType(FT, 0);
2096
2097  QualType Canonical;
2098  if (!ResultTy.isCanonical() ||
2099      getCanonicalCallConv(CallConv) != CallConv) {
2100    Canonical =
2101      getFunctionNoProtoType(getCanonicalType(ResultTy),
2102                     Info.withCallingConv(getCanonicalCallConv(CallConv)));
2103
2104    // Get the new insert position for the node we care about.
2105    FunctionNoProtoType *NewIP =
2106      FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos);
2107    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
2108  }
2109
2110  FunctionProtoType::ExtInfo newInfo = Info.withCallingConv(CallConv);
2111  FunctionNoProtoType *New = new (*this, TypeAlignment)
2112    FunctionNoProtoType(ResultTy, Canonical, newInfo);
2113  Types.push_back(New);
2114  FunctionNoProtoTypes.InsertNode(New, InsertPos);
2115  return QualType(New, 0);
2116}
2117
2118/// getFunctionType - Return a normal function type with a typed argument
2119/// list.  isVariadic indicates whether the argument list includes '...'.
2120QualType
2121ASTContext::getFunctionType(QualType ResultTy,
2122                            const QualType *ArgArray, unsigned NumArgs,
2123                            const FunctionProtoType::ExtProtoInfo &EPI) const {
2124  // Unique functions, to guarantee there is only one function of a particular
2125  // structure.
2126  llvm::FoldingSetNodeID ID;
2127  FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, EPI, *this);
2128
2129  void *InsertPos = 0;
2130  if (FunctionProtoType *FTP =
2131        FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos))
2132    return QualType(FTP, 0);
2133
2134  // Determine whether the type being created is already canonical or not.
2135  bool isCanonical =
2136    EPI.ExceptionSpecType == EST_None && ResultTy.isCanonical() &&
2137    !EPI.HasTrailingReturn;
2138  for (unsigned i = 0; i != NumArgs && isCanonical; ++i)
2139    if (!ArgArray[i].isCanonicalAsParam())
2140      isCanonical = false;
2141
2142  const CallingConv DefaultCC = EPI.ExtInfo.getCC();
2143  const CallingConv CallConv = (LangOpts.MRTD && DefaultCC == CC_Default) ?
2144                               CC_X86StdCall : DefaultCC;
2145
2146  // If this type isn't canonical, get the canonical version of it.
2147  // The exception spec is not part of the canonical type.
2148  QualType Canonical;
2149  if (!isCanonical || getCanonicalCallConv(CallConv) != CallConv) {
2150    SmallVector<QualType, 16> CanonicalArgs;
2151    CanonicalArgs.reserve(NumArgs);
2152    for (unsigned i = 0; i != NumArgs; ++i)
2153      CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i]));
2154
2155    FunctionProtoType::ExtProtoInfo CanonicalEPI = EPI;
2156    CanonicalEPI.HasTrailingReturn = false;
2157    CanonicalEPI.ExceptionSpecType = EST_None;
2158    CanonicalEPI.NumExceptions = 0;
2159    CanonicalEPI.ExtInfo
2160      = CanonicalEPI.ExtInfo.withCallingConv(getCanonicalCallConv(CallConv));
2161
2162    Canonical = getFunctionType(getCanonicalType(ResultTy),
2163                                CanonicalArgs.data(), NumArgs,
2164                                CanonicalEPI);
2165
2166    // Get the new insert position for the node we care about.
2167    FunctionProtoType *NewIP =
2168      FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos);
2169    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
2170  }
2171
2172  // FunctionProtoType objects are allocated with extra bytes after
2173  // them for three variable size arrays at the end:
2174  //  - parameter types
2175  //  - exception types
2176  //  - consumed-arguments flags
2177  // Instead of the exception types, there could be a noexcept
2178  // expression.
2179  size_t Size = sizeof(FunctionProtoType) +
2180                NumArgs * sizeof(QualType);
2181  if (EPI.ExceptionSpecType == EST_Dynamic)
2182    Size += EPI.NumExceptions * sizeof(QualType);
2183  else if (EPI.ExceptionSpecType == EST_ComputedNoexcept) {
2184    Size += sizeof(Expr*);
2185  }
2186  if (EPI.ConsumedArguments)
2187    Size += NumArgs * sizeof(bool);
2188
2189  FunctionProtoType *FTP = (FunctionProtoType*) Allocate(Size, TypeAlignment);
2190  FunctionProtoType::ExtProtoInfo newEPI = EPI;
2191  newEPI.ExtInfo = EPI.ExtInfo.withCallingConv(CallConv);
2192  new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, Canonical, newEPI);
2193  Types.push_back(FTP);
2194  FunctionProtoTypes.InsertNode(FTP, InsertPos);
2195  return QualType(FTP, 0);
2196}
2197
2198#ifndef NDEBUG
2199static bool NeedsInjectedClassNameType(const RecordDecl *D) {
2200  if (!isa<CXXRecordDecl>(D)) return false;
2201  const CXXRecordDecl *RD = cast<CXXRecordDecl>(D);
2202  if (isa<ClassTemplatePartialSpecializationDecl>(RD))
2203    return true;
2204  if (RD->getDescribedClassTemplate() &&
2205      !isa<ClassTemplateSpecializationDecl>(RD))
2206    return true;
2207  return false;
2208}
2209#endif
2210
2211/// getInjectedClassNameType - Return the unique reference to the
2212/// injected class name type for the specified templated declaration.
2213QualType ASTContext::getInjectedClassNameType(CXXRecordDecl *Decl,
2214                                              QualType TST) const {
2215  assert(NeedsInjectedClassNameType(Decl));
2216  if (Decl->TypeForDecl) {
2217    assert(isa<InjectedClassNameType>(Decl->TypeForDecl));
2218  } else if (CXXRecordDecl *PrevDecl = Decl->getPreviousDecl()) {
2219    assert(PrevDecl->TypeForDecl && "previous declaration has no type");
2220    Decl->TypeForDecl = PrevDecl->TypeForDecl;
2221    assert(isa<InjectedClassNameType>(Decl->TypeForDecl));
2222  } else {
2223    Type *newType =
2224      new (*this, TypeAlignment) InjectedClassNameType(Decl, TST);
2225    Decl->TypeForDecl = newType;
2226    Types.push_back(newType);
2227  }
2228  return QualType(Decl->TypeForDecl, 0);
2229}
2230
2231/// getTypeDeclType - Return the unique reference to the type for the
2232/// specified type declaration.
2233QualType ASTContext::getTypeDeclTypeSlow(const TypeDecl *Decl) const {
2234  assert(Decl && "Passed null for Decl param");
2235  assert(!Decl->TypeForDecl && "TypeForDecl present in slow case");
2236
2237  if (const TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Decl))
2238    return getTypedefType(Typedef);
2239
2240  assert(!isa<TemplateTypeParmDecl>(Decl) &&
2241         "Template type parameter types are always available.");
2242
2243  if (const RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) {
2244    assert(!Record->getPreviousDecl() &&
2245           "struct/union has previous declaration");
2246    assert(!NeedsInjectedClassNameType(Record));
2247    return getRecordType(Record);
2248  } else if (const EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) {
2249    assert(!Enum->getPreviousDecl() &&
2250           "enum has previous declaration");
2251    return getEnumType(Enum);
2252  } else if (const UnresolvedUsingTypenameDecl *Using =
2253               dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) {
2254    Type *newType = new (*this, TypeAlignment) UnresolvedUsingType(Using);
2255    Decl->TypeForDecl = newType;
2256    Types.push_back(newType);
2257  } else
2258    llvm_unreachable("TypeDecl without a type?");
2259
2260  return QualType(Decl->TypeForDecl, 0);
2261}
2262
2263/// getTypedefType - Return the unique reference to the type for the
2264/// specified typedef name decl.
2265QualType
2266ASTContext::getTypedefType(const TypedefNameDecl *Decl,
2267                           QualType Canonical) const {
2268  if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0);
2269
2270  if (Canonical.isNull())
2271    Canonical = getCanonicalType(Decl->getUnderlyingType());
2272  TypedefType *newType = new(*this, TypeAlignment)
2273    TypedefType(Type::Typedef, Decl, Canonical);
2274  Decl->TypeForDecl = newType;
2275  Types.push_back(newType);
2276  return QualType(newType, 0);
2277}
2278
2279QualType ASTContext::getRecordType(const RecordDecl *Decl) const {
2280  if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0);
2281
2282  if (const RecordDecl *PrevDecl = Decl->getPreviousDecl())
2283    if (PrevDecl->TypeForDecl)
2284      return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0);
2285
2286  RecordType *newType = new (*this, TypeAlignment) RecordType(Decl);
2287  Decl->TypeForDecl = newType;
2288  Types.push_back(newType);
2289  return QualType(newType, 0);
2290}
2291
2292QualType ASTContext::getEnumType(const EnumDecl *Decl) const {
2293  if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0);
2294
2295  if (const EnumDecl *PrevDecl = Decl->getPreviousDecl())
2296    if (PrevDecl->TypeForDecl)
2297      return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0);
2298
2299  EnumType *newType = new (*this, TypeAlignment) EnumType(Decl);
2300  Decl->TypeForDecl = newType;
2301  Types.push_back(newType);
2302  return QualType(newType, 0);
2303}
2304
2305QualType ASTContext::getAttributedType(AttributedType::Kind attrKind,
2306                                       QualType modifiedType,
2307                                       QualType equivalentType) {
2308  llvm::FoldingSetNodeID id;
2309  AttributedType::Profile(id, attrKind, modifiedType, equivalentType);
2310
2311  void *insertPos = 0;
2312  AttributedType *type = AttributedTypes.FindNodeOrInsertPos(id, insertPos);
2313  if (type) return QualType(type, 0);
2314
2315  QualType canon = getCanonicalType(equivalentType);
2316  type = new (*this, TypeAlignment)
2317           AttributedType(canon, attrKind, modifiedType, equivalentType);
2318
2319  Types.push_back(type);
2320  AttributedTypes.InsertNode(type, insertPos);
2321
2322  return QualType(type, 0);
2323}
2324
2325
2326/// \brief Retrieve a substitution-result type.
2327QualType
2328ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm,
2329                                         QualType Replacement) const {
2330  assert(Replacement.isCanonical()
2331         && "replacement types must always be canonical");
2332
2333  llvm::FoldingSetNodeID ID;
2334  SubstTemplateTypeParmType::Profile(ID, Parm, Replacement);
2335  void *InsertPos = 0;
2336  SubstTemplateTypeParmType *SubstParm
2337    = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos);
2338
2339  if (!SubstParm) {
2340    SubstParm = new (*this, TypeAlignment)
2341      SubstTemplateTypeParmType(Parm, Replacement);
2342    Types.push_back(SubstParm);
2343    SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos);
2344  }
2345
2346  return QualType(SubstParm, 0);
2347}
2348
2349/// \brief Retrieve a
2350QualType ASTContext::getSubstTemplateTypeParmPackType(
2351                                          const TemplateTypeParmType *Parm,
2352                                              const TemplateArgument &ArgPack) {
2353#ifndef NDEBUG
2354  for (TemplateArgument::pack_iterator P = ArgPack.pack_begin(),
2355                                    PEnd = ArgPack.pack_end();
2356       P != PEnd; ++P) {
2357    assert(P->getKind() == TemplateArgument::Type &&"Pack contains a non-type");
2358    assert(P->getAsType().isCanonical() && "Pack contains non-canonical type");
2359  }
2360#endif
2361
2362  llvm::FoldingSetNodeID ID;
2363  SubstTemplateTypeParmPackType::Profile(ID, Parm, ArgPack);
2364  void *InsertPos = 0;
2365  if (SubstTemplateTypeParmPackType *SubstParm
2366        = SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos))
2367    return QualType(SubstParm, 0);
2368
2369  QualType Canon;
2370  if (!Parm->isCanonicalUnqualified()) {
2371    Canon = getCanonicalType(QualType(Parm, 0));
2372    Canon = getSubstTemplateTypeParmPackType(cast<TemplateTypeParmType>(Canon),
2373                                             ArgPack);
2374    SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos);
2375  }
2376
2377  SubstTemplateTypeParmPackType *SubstParm
2378    = new (*this, TypeAlignment) SubstTemplateTypeParmPackType(Parm, Canon,
2379                                                               ArgPack);
2380  Types.push_back(SubstParm);
2381  SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos);
2382  return QualType(SubstParm, 0);
2383}
2384
2385/// \brief Retrieve the template type parameter type for a template
2386/// parameter or parameter pack with the given depth, index, and (optionally)
2387/// name.
2388QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index,
2389                                             bool ParameterPack,
2390                                             TemplateTypeParmDecl *TTPDecl) const {
2391  llvm::FoldingSetNodeID ID;
2392  TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, TTPDecl);
2393  void *InsertPos = 0;
2394  TemplateTypeParmType *TypeParm
2395    = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos);
2396
2397  if (TypeParm)
2398    return QualType(TypeParm, 0);
2399
2400  if (TTPDecl) {
2401    QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack);
2402    TypeParm = new (*this, TypeAlignment) TemplateTypeParmType(TTPDecl, Canon);
2403
2404    TemplateTypeParmType *TypeCheck
2405      = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos);
2406    assert(!TypeCheck && "Template type parameter canonical type broken");
2407    (void)TypeCheck;
2408  } else
2409    TypeParm = new (*this, TypeAlignment)
2410      TemplateTypeParmType(Depth, Index, ParameterPack);
2411
2412  Types.push_back(TypeParm);
2413  TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos);
2414
2415  return QualType(TypeParm, 0);
2416}
2417
2418TypeSourceInfo *
2419ASTContext::getTemplateSpecializationTypeInfo(TemplateName Name,
2420                                              SourceLocation NameLoc,
2421                                        const TemplateArgumentListInfo &Args,
2422                                              QualType Underlying) const {
2423  assert(!Name.getAsDependentTemplateName() &&
2424         "No dependent template names here!");
2425  QualType TST = getTemplateSpecializationType(Name, Args, Underlying);
2426
2427  TypeSourceInfo *DI = CreateTypeSourceInfo(TST);
2428  TemplateSpecializationTypeLoc TL
2429    = cast<TemplateSpecializationTypeLoc>(DI->getTypeLoc());
2430  TL.setTemplateKeywordLoc(SourceLocation());
2431  TL.setTemplateNameLoc(NameLoc);
2432  TL.setLAngleLoc(Args.getLAngleLoc());
2433  TL.setRAngleLoc(Args.getRAngleLoc());
2434  for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i)
2435    TL.setArgLocInfo(i, Args[i].getLocInfo());
2436  return DI;
2437}
2438
2439QualType
2440ASTContext::getTemplateSpecializationType(TemplateName Template,
2441                                          const TemplateArgumentListInfo &Args,
2442                                          QualType Underlying) const {
2443  assert(!Template.getAsDependentTemplateName() &&
2444         "No dependent template names here!");
2445
2446  unsigned NumArgs = Args.size();
2447
2448  SmallVector<TemplateArgument, 4> ArgVec;
2449  ArgVec.reserve(NumArgs);
2450  for (unsigned i = 0; i != NumArgs; ++i)
2451    ArgVec.push_back(Args[i].getArgument());
2452
2453  return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs,
2454                                       Underlying);
2455}
2456
2457#ifndef NDEBUG
2458static bool hasAnyPackExpansions(const TemplateArgument *Args,
2459                                 unsigned NumArgs) {
2460  for (unsigned I = 0; I != NumArgs; ++I)
2461    if (Args[I].isPackExpansion())
2462      return true;
2463
2464  return true;
2465}
2466#endif
2467
2468QualType
2469ASTContext::getTemplateSpecializationType(TemplateName Template,
2470                                          const TemplateArgument *Args,
2471                                          unsigned NumArgs,
2472                                          QualType Underlying) const {
2473  assert(!Template.getAsDependentTemplateName() &&
2474         "No dependent template names here!");
2475  // Look through qualified template names.
2476  if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName())
2477    Template = TemplateName(QTN->getTemplateDecl());
2478
2479  bool IsTypeAlias =
2480    Template.getAsTemplateDecl() &&
2481    isa<TypeAliasTemplateDecl>(Template.getAsTemplateDecl());
2482  QualType CanonType;
2483  if (!Underlying.isNull())
2484    CanonType = getCanonicalType(Underlying);
2485  else {
2486    // We can get here with an alias template when the specialization contains
2487    // a pack expansion that does not match up with a parameter pack.
2488    assert((!IsTypeAlias || hasAnyPackExpansions(Args, NumArgs)) &&
2489           "Caller must compute aliased type");
2490    IsTypeAlias = false;
2491    CanonType = getCanonicalTemplateSpecializationType(Template, Args,
2492                                                       NumArgs);
2493  }
2494
2495  // Allocate the (non-canonical) template specialization type, but don't
2496  // try to unique it: these types typically have location information that
2497  // we don't unique and don't want to lose.
2498  void *Mem = Allocate(sizeof(TemplateSpecializationType) +
2499                       sizeof(TemplateArgument) * NumArgs +
2500                       (IsTypeAlias? sizeof(QualType) : 0),
2501                       TypeAlignment);
2502  TemplateSpecializationType *Spec
2503    = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, CanonType,
2504                                         IsTypeAlias ? Underlying : QualType());
2505
2506  Types.push_back(Spec);
2507  return QualType(Spec, 0);
2508}
2509
2510QualType
2511ASTContext::getCanonicalTemplateSpecializationType(TemplateName Template,
2512                                                   const TemplateArgument *Args,
2513                                                   unsigned NumArgs) const {
2514  assert(!Template.getAsDependentTemplateName() &&
2515         "No dependent template names here!");
2516
2517  // Look through qualified template names.
2518  if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName())
2519    Template = TemplateName(QTN->getTemplateDecl());
2520
2521  // Build the canonical template specialization type.
2522  TemplateName CanonTemplate = getCanonicalTemplateName(Template);
2523  SmallVector<TemplateArgument, 4> CanonArgs;
2524  CanonArgs.reserve(NumArgs);
2525  for (unsigned I = 0; I != NumArgs; ++I)
2526    CanonArgs.push_back(getCanonicalTemplateArgument(Args[I]));
2527
2528  // Determine whether this canonical template specialization type already
2529  // exists.
2530  llvm::FoldingSetNodeID ID;
2531  TemplateSpecializationType::Profile(ID, CanonTemplate,
2532                                      CanonArgs.data(), NumArgs, *this);
2533
2534  void *InsertPos = 0;
2535  TemplateSpecializationType *Spec
2536    = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos);
2537
2538  if (!Spec) {
2539    // Allocate a new canonical template specialization type.
2540    void *Mem = Allocate((sizeof(TemplateSpecializationType) +
2541                          sizeof(TemplateArgument) * NumArgs),
2542                         TypeAlignment);
2543    Spec = new (Mem) TemplateSpecializationType(CanonTemplate,
2544                                                CanonArgs.data(), NumArgs,
2545                                                QualType(), QualType());
2546    Types.push_back(Spec);
2547    TemplateSpecializationTypes.InsertNode(Spec, InsertPos);
2548  }
2549
2550  assert(Spec->isDependentType() &&
2551         "Non-dependent template-id type must have a canonical type");
2552  return QualType(Spec, 0);
2553}
2554
2555QualType
2556ASTContext::getElaboratedType(ElaboratedTypeKeyword Keyword,
2557                              NestedNameSpecifier *NNS,
2558                              QualType NamedType) const {
2559  llvm::FoldingSetNodeID ID;
2560  ElaboratedType::Profile(ID, Keyword, NNS, NamedType);
2561
2562  void *InsertPos = 0;
2563  ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos);
2564  if (T)
2565    return QualType(T, 0);
2566
2567  QualType Canon = NamedType;
2568  if (!Canon.isCanonical()) {
2569    Canon = getCanonicalType(NamedType);
2570    ElaboratedType *CheckT = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos);
2571    assert(!CheckT && "Elaborated canonical type broken");
2572    (void)CheckT;
2573  }
2574
2575  T = new (*this) ElaboratedType(Keyword, NNS, NamedType, Canon);
2576  Types.push_back(T);
2577  ElaboratedTypes.InsertNode(T, InsertPos);
2578  return QualType(T, 0);
2579}
2580
2581QualType
2582ASTContext::getParenType(QualType InnerType) const {
2583  llvm::FoldingSetNodeID ID;
2584  ParenType::Profile(ID, InnerType);
2585
2586  void *InsertPos = 0;
2587  ParenType *T = ParenTypes.FindNodeOrInsertPos(ID, InsertPos);
2588  if (T)
2589    return QualType(T, 0);
2590
2591  QualType Canon = InnerType;
2592  if (!Canon.isCanonical()) {
2593    Canon = getCanonicalType(InnerType);
2594    ParenType *CheckT = ParenTypes.FindNodeOrInsertPos(ID, InsertPos);
2595    assert(!CheckT && "Paren canonical type broken");
2596    (void)CheckT;
2597  }
2598
2599  T = new (*this) ParenType(InnerType, Canon);
2600  Types.push_back(T);
2601  ParenTypes.InsertNode(T, InsertPos);
2602  return QualType(T, 0);
2603}
2604
2605QualType ASTContext::getDependentNameType(ElaboratedTypeKeyword Keyword,
2606                                          NestedNameSpecifier *NNS,
2607                                          const IdentifierInfo *Name,
2608                                          QualType Canon) const {
2609  assert(NNS->isDependent() && "nested-name-specifier must be dependent");
2610
2611  if (Canon.isNull()) {
2612    NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS);
2613    ElaboratedTypeKeyword CanonKeyword = Keyword;
2614    if (Keyword == ETK_None)
2615      CanonKeyword = ETK_Typename;
2616
2617    if (CanonNNS != NNS || CanonKeyword != Keyword)
2618      Canon = getDependentNameType(CanonKeyword, CanonNNS, Name);
2619  }
2620
2621  llvm::FoldingSetNodeID ID;
2622  DependentNameType::Profile(ID, Keyword, NNS, Name);
2623
2624  void *InsertPos = 0;
2625  DependentNameType *T
2626    = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos);
2627  if (T)
2628    return QualType(T, 0);
2629
2630  T = new (*this) DependentNameType(Keyword, NNS, Name, Canon);
2631  Types.push_back(T);
2632  DependentNameTypes.InsertNode(T, InsertPos);
2633  return QualType(T, 0);
2634}
2635
2636QualType
2637ASTContext::getDependentTemplateSpecializationType(
2638                                 ElaboratedTypeKeyword Keyword,
2639                                 NestedNameSpecifier *NNS,
2640                                 const IdentifierInfo *Name,
2641                                 const TemplateArgumentListInfo &Args) const {
2642  // TODO: avoid this copy
2643  SmallVector<TemplateArgument, 16> ArgCopy;
2644  for (unsigned I = 0, E = Args.size(); I != E; ++I)
2645    ArgCopy.push_back(Args[I].getArgument());
2646  return getDependentTemplateSpecializationType(Keyword, NNS, Name,
2647                                                ArgCopy.size(),
2648                                                ArgCopy.data());
2649}
2650
2651QualType
2652ASTContext::getDependentTemplateSpecializationType(
2653                                 ElaboratedTypeKeyword Keyword,
2654                                 NestedNameSpecifier *NNS,
2655                                 const IdentifierInfo *Name,
2656                                 unsigned NumArgs,
2657                                 const TemplateArgument *Args) const {
2658  assert((!NNS || NNS->isDependent()) &&
2659         "nested-name-specifier must be dependent");
2660
2661  llvm::FoldingSetNodeID ID;
2662  DependentTemplateSpecializationType::Profile(ID, *this, Keyword, NNS,
2663                                               Name, NumArgs, Args);
2664
2665  void *InsertPos = 0;
2666  DependentTemplateSpecializationType *T
2667    = DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos);
2668  if (T)
2669    return QualType(T, 0);
2670
2671  NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS);
2672
2673  ElaboratedTypeKeyword CanonKeyword = Keyword;
2674  if (Keyword == ETK_None) CanonKeyword = ETK_Typename;
2675
2676  bool AnyNonCanonArgs = false;
2677  SmallVector<TemplateArgument, 16> CanonArgs(NumArgs);
2678  for (unsigned I = 0; I != NumArgs; ++I) {
2679    CanonArgs[I] = getCanonicalTemplateArgument(Args[I]);
2680    if (!CanonArgs[I].structurallyEquals(Args[I]))
2681      AnyNonCanonArgs = true;
2682  }
2683
2684  QualType Canon;
2685  if (AnyNonCanonArgs || CanonNNS != NNS || CanonKeyword != Keyword) {
2686    Canon = getDependentTemplateSpecializationType(CanonKeyword, CanonNNS,
2687                                                   Name, NumArgs,
2688                                                   CanonArgs.data());
2689
2690    // Find the insert position again.
2691    DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos);
2692  }
2693
2694  void *Mem = Allocate((sizeof(DependentTemplateSpecializationType) +
2695                        sizeof(TemplateArgument) * NumArgs),
2696                       TypeAlignment);
2697  T = new (Mem) DependentTemplateSpecializationType(Keyword, NNS,
2698                                                    Name, NumArgs, Args, Canon);
2699  Types.push_back(T);
2700  DependentTemplateSpecializationTypes.InsertNode(T, InsertPos);
2701  return QualType(T, 0);
2702}
2703
2704QualType ASTContext::getPackExpansionType(QualType Pattern,
2705                                      llvm::Optional<unsigned> NumExpansions) {
2706  llvm::FoldingSetNodeID ID;
2707  PackExpansionType::Profile(ID, Pattern, NumExpansions);
2708
2709  assert(Pattern->containsUnexpandedParameterPack() &&
2710         "Pack expansions must expand one or more parameter packs");
2711  void *InsertPos = 0;
2712  PackExpansionType *T
2713    = PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos);
2714  if (T)
2715    return QualType(T, 0);
2716
2717  QualType Canon;
2718  if (!Pattern.isCanonical()) {
2719    Canon = getPackExpansionType(getCanonicalType(Pattern), NumExpansions);
2720
2721    // Find the insert position again.
2722    PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos);
2723  }
2724
2725  T = new (*this) PackExpansionType(Pattern, Canon, NumExpansions);
2726  Types.push_back(T);
2727  PackExpansionTypes.InsertNode(T, InsertPos);
2728  return QualType(T, 0);
2729}
2730
2731/// CmpProtocolNames - Comparison predicate for sorting protocols
2732/// alphabetically.
2733static bool CmpProtocolNames(const ObjCProtocolDecl *LHS,
2734                            const ObjCProtocolDecl *RHS) {
2735  return LHS->getDeclName() < RHS->getDeclName();
2736}
2737
2738static bool areSortedAndUniqued(ObjCProtocolDecl * const *Protocols,
2739                                unsigned NumProtocols) {
2740  if (NumProtocols == 0) return true;
2741
2742  if (Protocols[0]->getCanonicalDecl() != Protocols[0])
2743    return false;
2744
2745  for (unsigned i = 1; i != NumProtocols; ++i)
2746    if (!CmpProtocolNames(Protocols[i-1], Protocols[i]) ||
2747        Protocols[i]->getCanonicalDecl() != Protocols[i])
2748      return false;
2749  return true;
2750}
2751
2752static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols,
2753                                   unsigned &NumProtocols) {
2754  ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols;
2755
2756  // Sort protocols, keyed by name.
2757  std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames);
2758
2759  // Canonicalize.
2760  for (unsigned I = 0, N = NumProtocols; I != N; ++I)
2761    Protocols[I] = Protocols[I]->getCanonicalDecl();
2762
2763  // Remove duplicates.
2764  ProtocolsEnd = std::unique(Protocols, ProtocolsEnd);
2765  NumProtocols = ProtocolsEnd-Protocols;
2766}
2767
2768QualType ASTContext::getObjCObjectType(QualType BaseType,
2769                                       ObjCProtocolDecl * const *Protocols,
2770                                       unsigned NumProtocols) const {
2771  // If the base type is an interface and there aren't any protocols
2772  // to add, then the interface type will do just fine.
2773  if (!NumProtocols && isa<ObjCInterfaceType>(BaseType))
2774    return BaseType;
2775
2776  // Look in the folding set for an existing type.
2777  llvm::FoldingSetNodeID ID;
2778  ObjCObjectTypeImpl::Profile(ID, BaseType, Protocols, NumProtocols);
2779  void *InsertPos = 0;
2780  if (ObjCObjectType *QT = ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos))
2781    return QualType(QT, 0);
2782
2783  // Build the canonical type, which has the canonical base type and
2784  // a sorted-and-uniqued list of protocols.
2785  QualType Canonical;
2786  bool ProtocolsSorted = areSortedAndUniqued(Protocols, NumProtocols);
2787  if (!ProtocolsSorted || !BaseType.isCanonical()) {
2788    if (!ProtocolsSorted) {
2789      SmallVector<ObjCProtocolDecl*, 8> Sorted(Protocols,
2790                                                     Protocols + NumProtocols);
2791      unsigned UniqueCount = NumProtocols;
2792
2793      SortAndUniqueProtocols(&Sorted[0], UniqueCount);
2794      Canonical = getObjCObjectType(getCanonicalType(BaseType),
2795                                    &Sorted[0], UniqueCount);
2796    } else {
2797      Canonical = getObjCObjectType(getCanonicalType(BaseType),
2798                                    Protocols, NumProtocols);
2799    }
2800
2801    // Regenerate InsertPos.
2802    ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos);
2803  }
2804
2805  unsigned Size = sizeof(ObjCObjectTypeImpl);
2806  Size += NumProtocols * sizeof(ObjCProtocolDecl *);
2807  void *Mem = Allocate(Size, TypeAlignment);
2808  ObjCObjectTypeImpl *T =
2809    new (Mem) ObjCObjectTypeImpl(Canonical, BaseType, Protocols, NumProtocols);
2810
2811  Types.push_back(T);
2812  ObjCObjectTypes.InsertNode(T, InsertPos);
2813  return QualType(T, 0);
2814}
2815
2816/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for
2817/// the given object type.
2818QualType ASTContext::getObjCObjectPointerType(QualType ObjectT) const {
2819  llvm::FoldingSetNodeID ID;
2820  ObjCObjectPointerType::Profile(ID, ObjectT);
2821
2822  void *InsertPos = 0;
2823  if (ObjCObjectPointerType *QT =
2824              ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos))
2825    return QualType(QT, 0);
2826
2827  // Find the canonical object type.
2828  QualType Canonical;
2829  if (!ObjectT.isCanonical()) {
2830    Canonical = getObjCObjectPointerType(getCanonicalType(ObjectT));
2831
2832    // Regenerate InsertPos.
2833    ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos);
2834  }
2835
2836  // No match.
2837  void *Mem = Allocate(sizeof(ObjCObjectPointerType), TypeAlignment);
2838  ObjCObjectPointerType *QType =
2839    new (Mem) ObjCObjectPointerType(Canonical, ObjectT);
2840
2841  Types.push_back(QType);
2842  ObjCObjectPointerTypes.InsertNode(QType, InsertPos);
2843  return QualType(QType, 0);
2844}
2845
2846/// getObjCInterfaceType - Return the unique reference to the type for the
2847/// specified ObjC interface decl. The list of protocols is optional.
2848QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl,
2849                                          ObjCInterfaceDecl *PrevDecl) const {
2850  if (Decl->TypeForDecl)
2851    return QualType(Decl->TypeForDecl, 0);
2852
2853  if (PrevDecl) {
2854    assert(PrevDecl->TypeForDecl && "previous decl has no TypeForDecl");
2855    Decl->TypeForDecl = PrevDecl->TypeForDecl;
2856    return QualType(PrevDecl->TypeForDecl, 0);
2857  }
2858
2859  // Prefer the definition, if there is one.
2860  if (const ObjCInterfaceDecl *Def = Decl->getDefinition())
2861    Decl = Def;
2862
2863  void *Mem = Allocate(sizeof(ObjCInterfaceType), TypeAlignment);
2864  ObjCInterfaceType *T = new (Mem) ObjCInterfaceType(Decl);
2865  Decl->TypeForDecl = T;
2866  Types.push_back(T);
2867  return QualType(T, 0);
2868}
2869
2870/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique
2871/// TypeOfExprType AST's (since expression's are never shared). For example,
2872/// multiple declarations that refer to "typeof(x)" all contain different
2873/// DeclRefExpr's. This doesn't effect the type checker, since it operates
2874/// on canonical type's (which are always unique).
2875QualType ASTContext::getTypeOfExprType(Expr *tofExpr) const {
2876  TypeOfExprType *toe;
2877  if (tofExpr->isTypeDependent()) {
2878    llvm::FoldingSetNodeID ID;
2879    DependentTypeOfExprType::Profile(ID, *this, tofExpr);
2880
2881    void *InsertPos = 0;
2882    DependentTypeOfExprType *Canon
2883      = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos);
2884    if (Canon) {
2885      // We already have a "canonical" version of an identical, dependent
2886      // typeof(expr) type. Use that as our canonical type.
2887      toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr,
2888                                          QualType((TypeOfExprType*)Canon, 0));
2889    } else {
2890      // Build a new, canonical typeof(expr) type.
2891      Canon
2892        = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr);
2893      DependentTypeOfExprTypes.InsertNode(Canon, InsertPos);
2894      toe = Canon;
2895    }
2896  } else {
2897    QualType Canonical = getCanonicalType(tofExpr->getType());
2898    toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical);
2899  }
2900  Types.push_back(toe);
2901  return QualType(toe, 0);
2902}
2903
2904/// getTypeOfType -  Unlike many "get<Type>" functions, we don't unique
2905/// TypeOfType AST's. The only motivation to unique these nodes would be
2906/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be
2907/// an issue. This doesn't effect the type checker, since it operates
2908/// on canonical type's (which are always unique).
2909QualType ASTContext::getTypeOfType(QualType tofType) const {
2910  QualType Canonical = getCanonicalType(tofType);
2911  TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical);
2912  Types.push_back(tot);
2913  return QualType(tot, 0);
2914}
2915
2916
2917/// getDecltypeType -  Unlike many "get<Type>" functions, we don't unique
2918/// DecltypeType AST's. The only motivation to unique these nodes would be
2919/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be
2920/// an issue. This doesn't effect the type checker, since it operates
2921/// on canonical types (which are always unique).
2922QualType ASTContext::getDecltypeType(Expr *e, QualType UnderlyingType) const {
2923  DecltypeType *dt;
2924
2925  // C++0x [temp.type]p2:
2926  //   If an expression e involves a template parameter, decltype(e) denotes a
2927  //   unique dependent type. Two such decltype-specifiers refer to the same
2928  //   type only if their expressions are equivalent (14.5.6.1).
2929  if (e->isInstantiationDependent()) {
2930    llvm::FoldingSetNodeID ID;
2931    DependentDecltypeType::Profile(ID, *this, e);
2932
2933    void *InsertPos = 0;
2934    DependentDecltypeType *Canon
2935      = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos);
2936    if (Canon) {
2937      // We already have a "canonical" version of an equivalent, dependent
2938      // decltype type. Use that as our canonical type.
2939      dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy,
2940                                       QualType((DecltypeType*)Canon, 0));
2941    } else {
2942      // Build a new, canonical typeof(expr) type.
2943      Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e);
2944      DependentDecltypeTypes.InsertNode(Canon, InsertPos);
2945      dt = Canon;
2946    }
2947  } else {
2948    dt = new (*this, TypeAlignment) DecltypeType(e, UnderlyingType,
2949                                      getCanonicalType(UnderlyingType));
2950  }
2951  Types.push_back(dt);
2952  return QualType(dt, 0);
2953}
2954
2955/// getUnaryTransformationType - We don't unique these, since the memory
2956/// savings are minimal and these are rare.
2957QualType ASTContext::getUnaryTransformType(QualType BaseType,
2958                                           QualType UnderlyingType,
2959                                           UnaryTransformType::UTTKind Kind)
2960    const {
2961  UnaryTransformType *Ty =
2962    new (*this, TypeAlignment) UnaryTransformType (BaseType, UnderlyingType,
2963                                                   Kind,
2964                                 UnderlyingType->isDependentType() ?
2965                                    QualType() : UnderlyingType);
2966  Types.push_back(Ty);
2967  return QualType(Ty, 0);
2968}
2969
2970/// getAutoType - We only unique auto types after they've been deduced.
2971QualType ASTContext::getAutoType(QualType DeducedType) const {
2972  void *InsertPos = 0;
2973  if (!DeducedType.isNull()) {
2974    // Look in the folding set for an existing type.
2975    llvm::FoldingSetNodeID ID;
2976    AutoType::Profile(ID, DeducedType);
2977    if (AutoType *AT = AutoTypes.FindNodeOrInsertPos(ID, InsertPos))
2978      return QualType(AT, 0);
2979  }
2980
2981  AutoType *AT = new (*this, TypeAlignment) AutoType(DeducedType);
2982  Types.push_back(AT);
2983  if (InsertPos)
2984    AutoTypes.InsertNode(AT, InsertPos);
2985  return QualType(AT, 0);
2986}
2987
2988/// getAtomicType - Return the uniqued reference to the atomic type for
2989/// the given value type.
2990QualType ASTContext::getAtomicType(QualType T) const {
2991  // Unique pointers, to guarantee there is only one pointer of a particular
2992  // structure.
2993  llvm::FoldingSetNodeID ID;
2994  AtomicType::Profile(ID, T);
2995
2996  void *InsertPos = 0;
2997  if (AtomicType *AT = AtomicTypes.FindNodeOrInsertPos(ID, InsertPos))
2998    return QualType(AT, 0);
2999
3000  // If the atomic value type isn't canonical, this won't be a canonical type
3001  // either, so fill in the canonical type field.
3002  QualType Canonical;
3003  if (!T.isCanonical()) {
3004    Canonical = getAtomicType(getCanonicalType(T));
3005
3006    // Get the new insert position for the node we care about.
3007    AtomicType *NewIP = AtomicTypes.FindNodeOrInsertPos(ID, InsertPos);
3008    assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP;
3009  }
3010  AtomicType *New = new (*this, TypeAlignment) AtomicType(T, Canonical);
3011  Types.push_back(New);
3012  AtomicTypes.InsertNode(New, InsertPos);
3013  return QualType(New, 0);
3014}
3015
3016/// getAutoDeductType - Get type pattern for deducing against 'auto'.
3017QualType ASTContext::getAutoDeductType() const {
3018  if (AutoDeductTy.isNull())
3019    AutoDeductTy = getAutoType(QualType());
3020  assert(!AutoDeductTy.isNull() && "can't build 'auto' pattern");
3021  return AutoDeductTy;
3022}
3023
3024/// getAutoRRefDeductType - Get type pattern for deducing against 'auto &&'.
3025QualType ASTContext::getAutoRRefDeductType() const {
3026  if (AutoRRefDeductTy.isNull())
3027    AutoRRefDeductTy = getRValueReferenceType(getAutoDeductType());
3028  assert(!AutoRRefDeductTy.isNull() && "can't build 'auto &&' pattern");
3029  return AutoRRefDeductTy;
3030}
3031
3032/// getTagDeclType - Return the unique reference to the type for the
3033/// specified TagDecl (struct/union/class/enum) decl.
3034QualType ASTContext::getTagDeclType(const TagDecl *Decl) const {
3035  assert (Decl);
3036  // FIXME: What is the design on getTagDeclType when it requires casting
3037  // away const?  mutable?
3038  return getTypeDeclType(const_cast<TagDecl*>(Decl));
3039}
3040
3041/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result
3042/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and
3043/// needs to agree with the definition in <stddef.h>.
3044CanQualType ASTContext::getSizeType() const {
3045  return getFromTargetType(Target->getSizeType());
3046}
3047
3048/// getIntMaxType - Return the unique type for "intmax_t" (C99 7.18.1.5).
3049CanQualType ASTContext::getIntMaxType() const {
3050  return getFromTargetType(Target->getIntMaxType());
3051}
3052
3053/// getUIntMaxType - Return the unique type for "uintmax_t" (C99 7.18.1.5).
3054CanQualType ASTContext::getUIntMaxType() const {
3055  return getFromTargetType(Target->getUIntMaxType());
3056}
3057
3058/// getSignedWCharType - Return the type of "signed wchar_t".
3059/// Used when in C++, as a GCC extension.
3060QualType ASTContext::getSignedWCharType() const {
3061  // FIXME: derive from "Target" ?
3062  return WCharTy;
3063}
3064
3065/// getUnsignedWCharType - Return the type of "unsigned wchar_t".
3066/// Used when in C++, as a GCC extension.
3067QualType ASTContext::getUnsignedWCharType() const {
3068  // FIXME: derive from "Target" ?
3069  return UnsignedIntTy;
3070}
3071
3072/// getPointerDiffType - Return the unique type for "ptrdiff_t" (C99 7.17)
3073/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9).
3074QualType ASTContext::getPointerDiffType() const {
3075  return getFromTargetType(Target->getPtrDiffType(0));
3076}
3077
3078//===----------------------------------------------------------------------===//
3079//                              Type Operators
3080//===----------------------------------------------------------------------===//
3081
3082CanQualType ASTContext::getCanonicalParamType(QualType T) const {
3083  // Push qualifiers into arrays, and then discard any remaining
3084  // qualifiers.
3085  T = getCanonicalType(T);
3086  T = getVariableArrayDecayedType(T);
3087  const Type *Ty = T.getTypePtr();
3088  QualType Result;
3089  if (isa<ArrayType>(Ty)) {
3090    Result = getArrayDecayedType(QualType(Ty,0));
3091  } else if (isa<FunctionType>(Ty)) {
3092    Result = getPointerType(QualType(Ty, 0));
3093  } else {
3094    Result = QualType(Ty, 0);
3095  }
3096
3097  return CanQualType::CreateUnsafe(Result);
3098}
3099
3100QualType ASTContext::getUnqualifiedArrayType(QualType type,
3101                                             Qualifiers &quals) {
3102  SplitQualType splitType = type.getSplitUnqualifiedType();
3103
3104  // FIXME: getSplitUnqualifiedType() actually walks all the way to
3105  // the unqualified desugared type and then drops it on the floor.
3106  // We then have to strip that sugar back off with
3107  // getUnqualifiedDesugaredType(), which is silly.
3108  const ArrayType *AT =
3109    dyn_cast<ArrayType>(splitType.Ty->getUnqualifiedDesugaredType());
3110
3111  // If we don't have an array, just use the results in splitType.
3112  if (!AT) {
3113    quals = splitType.Quals;
3114    return QualType(splitType.Ty, 0);
3115  }
3116
3117  // Otherwise, recurse on the array's element type.
3118  QualType elementType = AT->getElementType();
3119  QualType unqualElementType = getUnqualifiedArrayType(elementType, quals);
3120
3121  // If that didn't change the element type, AT has no qualifiers, so we
3122  // can just use the results in splitType.
3123  if (elementType == unqualElementType) {
3124    assert(quals.empty()); // from the recursive call
3125    quals = splitType.Quals;
3126    return QualType(splitType.Ty, 0);
3127  }
3128
3129  // Otherwise, add in the qualifiers from the outermost type, then
3130  // build the type back up.
3131  quals.addConsistentQualifiers(splitType.Quals);
3132
3133  if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) {
3134    return getConstantArrayType(unqualElementType, CAT->getSize(),
3135                                CAT->getSizeModifier(), 0);
3136  }
3137
3138  if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) {
3139    return getIncompleteArrayType(unqualElementType, IAT->getSizeModifier(), 0);
3140  }
3141
3142  if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(AT)) {
3143    return getVariableArrayType(unqualElementType,
3144                                VAT->getSizeExpr(),
3145                                VAT->getSizeModifier(),
3146                                VAT->getIndexTypeCVRQualifiers(),
3147                                VAT->getBracketsRange());
3148  }
3149
3150  const DependentSizedArrayType *DSAT = cast<DependentSizedArrayType>(AT);
3151  return getDependentSizedArrayType(unqualElementType, DSAT->getSizeExpr(),
3152                                    DSAT->getSizeModifier(), 0,
3153                                    SourceRange());
3154}
3155
3156/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types  that
3157/// may be similar (C++ 4.4), replaces T1 and T2 with the type that
3158/// they point to and return true. If T1 and T2 aren't pointer types
3159/// or pointer-to-member types, or if they are not similar at this
3160/// level, returns false and leaves T1 and T2 unchanged. Top-level
3161/// qualifiers on T1 and T2 are ignored. This function will typically
3162/// be called in a loop that successively "unwraps" pointer and
3163/// pointer-to-member types to compare them at each level.
3164bool ASTContext::UnwrapSimilarPointerTypes(QualType &T1, QualType &T2) {
3165  const PointerType *T1PtrType = T1->getAs<PointerType>(),
3166                    *T2PtrType = T2->getAs<PointerType>();
3167  if (T1PtrType && T2PtrType) {
3168    T1 = T1PtrType->getPointeeType();
3169    T2 = T2PtrType->getPointeeType();
3170    return true;
3171  }
3172
3173  const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(),
3174                          *T2MPType = T2->getAs<MemberPointerType>();
3175  if (T1MPType && T2MPType &&
3176      hasSameUnqualifiedType(QualType(T1MPType->getClass(), 0),
3177                             QualType(T2MPType->getClass(), 0))) {
3178    T1 = T1MPType->getPointeeType();
3179    T2 = T2MPType->getPointeeType();
3180    return true;
3181  }
3182
3183  if (getLangOptions().ObjC1) {
3184    const ObjCObjectPointerType *T1OPType = T1->getAs<ObjCObjectPointerType>(),
3185                                *T2OPType = T2->getAs<ObjCObjectPointerType>();
3186    if (T1OPType && T2OPType) {
3187      T1 = T1OPType->getPointeeType();
3188      T2 = T2OPType->getPointeeType();
3189      return true;
3190    }
3191  }
3192
3193  // FIXME: Block pointers, too?
3194
3195  return false;
3196}
3197
3198DeclarationNameInfo
3199ASTContext::getNameForTemplate(TemplateName Name,
3200                               SourceLocation NameLoc) const {
3201  switch (Name.getKind()) {
3202  case TemplateName::QualifiedTemplate:
3203  case TemplateName::Template:
3204    // DNInfo work in progress: CHECKME: what about DNLoc?
3205    return DeclarationNameInfo(Name.getAsTemplateDecl()->getDeclName(),
3206                               NameLoc);
3207
3208  case TemplateName::OverloadedTemplate: {
3209    OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate();
3210    // DNInfo work in progress: CHECKME: what about DNLoc?
3211    return DeclarationNameInfo((*Storage->begin())->getDeclName(), NameLoc);
3212  }
3213
3214  case TemplateName::DependentTemplate: {
3215    DependentTemplateName *DTN = Name.getAsDependentTemplateName();
3216    DeclarationName DName;
3217    if (DTN->isIdentifier()) {
3218      DName = DeclarationNames.getIdentifier(DTN->getIdentifier());
3219      return DeclarationNameInfo(DName, NameLoc);
3220    } else {
3221      DName = DeclarationNames.getCXXOperatorName(DTN->getOperator());
3222      // DNInfo work in progress: FIXME: source locations?
3223      DeclarationNameLoc DNLoc;
3224      DNLoc.CXXOperatorName.BeginOpNameLoc = SourceLocation().getRawEncoding();
3225      DNLoc.CXXOperatorName.EndOpNameLoc = SourceLocation().getRawEncoding();
3226      return DeclarationNameInfo(DName, NameLoc, DNLoc);
3227    }
3228  }
3229
3230  case TemplateName::SubstTemplateTemplateParm: {
3231    SubstTemplateTemplateParmStorage *subst
3232      = Name.getAsSubstTemplateTemplateParm();
3233    return DeclarationNameInfo(subst->getParameter()->getDeclName(),
3234                               NameLoc);
3235  }
3236
3237  case TemplateName::SubstTemplateTemplateParmPack: {
3238    SubstTemplateTemplateParmPackStorage *subst
3239      = Name.getAsSubstTemplateTemplateParmPack();
3240    return DeclarationNameInfo(subst->getParameterPack()->getDeclName(),
3241                               NameLoc);
3242  }
3243  }
3244
3245  llvm_unreachable("bad template name kind!");
3246}
3247
3248TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) const {
3249  switch (Name.getKind()) {
3250  case TemplateName::QualifiedTemplate:
3251  case TemplateName::Template: {
3252    TemplateDecl *Template = Name.getAsTemplateDecl();
3253    if (TemplateTemplateParmDecl *TTP
3254          = dyn_cast<TemplateTemplateParmDecl>(Template))
3255      Template = getCanonicalTemplateTemplateParmDecl(TTP);
3256
3257    // The canonical template name is the canonical template declaration.
3258    return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl()));
3259  }
3260
3261  case TemplateName::OverloadedTemplate:
3262    llvm_unreachable("cannot canonicalize overloaded template");
3263
3264  case TemplateName::DependentTemplate: {
3265    DependentTemplateName *DTN = Name.getAsDependentTemplateName();
3266    assert(DTN && "Non-dependent template names must refer to template decls.");
3267    return DTN->CanonicalTemplateName;
3268  }
3269
3270  case TemplateName::SubstTemplateTemplateParm: {
3271    SubstTemplateTemplateParmStorage *subst
3272      = Name.getAsSubstTemplateTemplateParm();
3273    return getCanonicalTemplateName(subst->getReplacement());
3274  }
3275
3276  case TemplateName::SubstTemplateTemplateParmPack: {
3277    SubstTemplateTemplateParmPackStorage *subst
3278                                  = Name.getAsSubstTemplateTemplateParmPack();
3279    TemplateTemplateParmDecl *canonParameter
3280      = getCanonicalTemplateTemplateParmDecl(subst->getParameterPack());
3281    TemplateArgument canonArgPack
3282      = getCanonicalTemplateArgument(subst->getArgumentPack());
3283    return getSubstTemplateTemplateParmPack(canonParameter, canonArgPack);
3284  }
3285  }
3286
3287  llvm_unreachable("bad template name!");
3288}
3289
3290bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) {
3291  X = getCanonicalTemplateName(X);
3292  Y = getCanonicalTemplateName(Y);
3293  return X.getAsVoidPointer() == Y.getAsVoidPointer();
3294}
3295
3296TemplateArgument
3297ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) const {
3298  switch (Arg.getKind()) {
3299    case TemplateArgument::Null:
3300      return Arg;
3301
3302    case TemplateArgument::Expression:
3303      return Arg;
3304
3305    case TemplateArgument::Declaration:
3306      return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl());
3307
3308    case TemplateArgument::Template:
3309      return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate()));
3310
3311    case TemplateArgument::TemplateExpansion:
3312      return TemplateArgument(getCanonicalTemplateName(
3313                                         Arg.getAsTemplateOrTemplatePattern()),
3314                              Arg.getNumTemplateExpansions());
3315
3316    case TemplateArgument::Integral:
3317      return TemplateArgument(*Arg.getAsIntegral(),
3318                              getCanonicalType(Arg.getIntegralType()));
3319
3320    case TemplateArgument::Type:
3321      return TemplateArgument(getCanonicalType(Arg.getAsType()));
3322
3323    case TemplateArgument::Pack: {
3324      if (Arg.pack_size() == 0)
3325        return Arg;
3326
3327      TemplateArgument *CanonArgs
3328        = new (*this) TemplateArgument[Arg.pack_size()];
3329      unsigned Idx = 0;
3330      for (TemplateArgument::pack_iterator A = Arg.pack_begin(),
3331                                        AEnd = Arg.pack_end();
3332           A != AEnd; (void)++A, ++Idx)
3333        CanonArgs[Idx] = getCanonicalTemplateArgument(*A);
3334
3335      return TemplateArgument(CanonArgs, Arg.pack_size());
3336    }
3337  }
3338
3339  // Silence GCC warning
3340  llvm_unreachable("Unhandled template argument kind");
3341}
3342
3343NestedNameSpecifier *
3344ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) const {
3345  if (!NNS)
3346    return 0;
3347
3348  switch (NNS->getKind()) {
3349  case NestedNameSpecifier::Identifier:
3350    // Canonicalize the prefix but keep the identifier the same.
3351    return NestedNameSpecifier::Create(*this,
3352                         getCanonicalNestedNameSpecifier(NNS->getPrefix()),
3353                                       NNS->getAsIdentifier());
3354
3355  case NestedNameSpecifier::Namespace:
3356    // A namespace is canonical; build a nested-name-specifier with
3357    // this namespace and no prefix.
3358    return NestedNameSpecifier::Create(*this, 0,
3359                                 NNS->getAsNamespace()->getOriginalNamespace());
3360
3361  case NestedNameSpecifier::NamespaceAlias:
3362    // A namespace is canonical; build a nested-name-specifier with
3363    // this namespace and no prefix.
3364    return NestedNameSpecifier::Create(*this, 0,
3365                                    NNS->getAsNamespaceAlias()->getNamespace()
3366                                                      ->getOriginalNamespace());
3367
3368  case NestedNameSpecifier::TypeSpec:
3369  case NestedNameSpecifier::TypeSpecWithTemplate: {
3370    QualType T = getCanonicalType(QualType(NNS->getAsType(), 0));
3371
3372    // If we have some kind of dependent-named type (e.g., "typename T::type"),
3373    // break it apart into its prefix and identifier, then reconsititute those
3374    // as the canonical nested-name-specifier. This is required to canonicalize
3375    // a dependent nested-name-specifier involving typedefs of dependent-name
3376    // types, e.g.,
3377    //   typedef typename T::type T1;
3378    //   typedef typename T1::type T2;
3379    if (const DependentNameType *DNT = T->getAs<DependentNameType>()) {
3380      NestedNameSpecifier *Prefix
3381        = getCanonicalNestedNameSpecifier(DNT->getQualifier());
3382      return NestedNameSpecifier::Create(*this, Prefix,
3383                           const_cast<IdentifierInfo *>(DNT->getIdentifier()));
3384    }
3385
3386    // Do the same thing as above, but with dependent-named specializations.
3387    if (const DependentTemplateSpecializationType *DTST
3388          = T->getAs<DependentTemplateSpecializationType>()) {
3389      NestedNameSpecifier *Prefix
3390        = getCanonicalNestedNameSpecifier(DTST->getQualifier());
3391
3392      T = getDependentTemplateSpecializationType(DTST->getKeyword(),
3393                                                 Prefix, DTST->getIdentifier(),
3394                                                 DTST->getNumArgs(),
3395                                                 DTST->getArgs());
3396      T = getCanonicalType(T);
3397    }
3398
3399    return NestedNameSpecifier::Create(*this, 0, false,
3400                                       const_cast<Type*>(T.getTypePtr()));
3401  }
3402
3403  case NestedNameSpecifier::Global:
3404    // The global specifier is canonical and unique.
3405    return NNS;
3406  }
3407
3408  llvm_unreachable("Invalid NestedNameSpecifier::Kind!");
3409}
3410
3411
3412const ArrayType *ASTContext::getAsArrayType(QualType T) const {
3413  // Handle the non-qualified case efficiently.
3414  if (!T.hasLocalQualifiers()) {
3415    // Handle the common positive case fast.
3416    if (const ArrayType *AT = dyn_cast<ArrayType>(T))
3417      return AT;
3418  }
3419
3420  // Handle the common negative case fast.
3421  if (!isa<ArrayType>(T.getCanonicalType()))
3422    return 0;
3423
3424  // Apply any qualifiers from the array type to the element type.  This
3425  // implements C99 6.7.3p8: "If the specification of an array type includes
3426  // any type qualifiers, the element type is so qualified, not the array type."
3427
3428  // If we get here, we either have type qualifiers on the type, or we have
3429  // sugar such as a typedef in the way.  If we have type qualifiers on the type
3430  // we must propagate them down into the element type.
3431
3432  SplitQualType split = T.getSplitDesugaredType();
3433  Qualifiers qs = split.Quals;
3434
3435  // If we have a simple case, just return now.
3436  const ArrayType *ATy = dyn_cast<ArrayType>(split.Ty);
3437  if (ATy == 0 || qs.empty())
3438    return ATy;
3439
3440  // Otherwise, we have an array and we have qualifiers on it.  Push the
3441  // qualifiers into the array element type and return a new array type.
3442  QualType NewEltTy = getQualifiedType(ATy->getElementType(), qs);
3443
3444  if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy))
3445    return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(),
3446                                                CAT->getSizeModifier(),
3447                                           CAT->getIndexTypeCVRQualifiers()));
3448  if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy))
3449    return cast<ArrayType>(getIncompleteArrayType(NewEltTy,
3450                                                  IAT->getSizeModifier(),
3451                                           IAT->getIndexTypeCVRQualifiers()));
3452
3453  if (const DependentSizedArrayType *DSAT
3454        = dyn_cast<DependentSizedArrayType>(ATy))
3455    return cast<ArrayType>(
3456                     getDependentSizedArrayType(NewEltTy,
3457                                                DSAT->getSizeExpr(),
3458                                                DSAT->getSizeModifier(),
3459                                              DSAT->getIndexTypeCVRQualifiers(),
3460                                                DSAT->getBracketsRange()));
3461
3462  const VariableArrayType *VAT = cast<VariableArrayType>(ATy);
3463  return cast<ArrayType>(getVariableArrayType(NewEltTy,
3464                                              VAT->getSizeExpr(),
3465                                              VAT->getSizeModifier(),
3466                                              VAT->getIndexTypeCVRQualifiers(),
3467                                              VAT->getBracketsRange()));
3468}
3469
3470QualType ASTContext::getAdjustedParameterType(QualType T) {
3471  // C99 6.7.5.3p7:
3472  //   A declaration of a parameter as "array of type" shall be
3473  //   adjusted to "qualified pointer to type", where the type
3474  //   qualifiers (if any) are those specified within the [ and ] of
3475  //   the array type derivation.
3476  if (T->isArrayType())
3477    return getArrayDecayedType(T);
3478
3479  // C99 6.7.5.3p8:
3480  //   A declaration of a parameter as "function returning type"
3481  //   shall be adjusted to "pointer to function returning type", as
3482  //   in 6.3.2.1.
3483  if (T->isFunctionType())
3484    return getPointerType(T);
3485
3486  return T;
3487}
3488
3489QualType ASTContext::getSignatureParameterType(QualType T) {
3490  T = getVariableArrayDecayedType(T);
3491  T = getAdjustedParameterType(T);
3492  return T.getUnqualifiedType();
3493}
3494
3495/// getArrayDecayedType - Return the properly qualified result of decaying the
3496/// specified array type to a pointer.  This operation is non-trivial when
3497/// handling typedefs etc.  The canonical type of "T" must be an array type,
3498/// this returns a pointer to a properly qualified element of the array.
3499///
3500/// See C99 6.7.5.3p7 and C99 6.3.2.1p3.
3501QualType ASTContext::getArrayDecayedType(QualType Ty) const {
3502  // Get the element type with 'getAsArrayType' so that we don't lose any
3503  // typedefs in the element type of the array.  This also handles propagation
3504  // of type qualifiers from the array type into the element type if present
3505  // (C99 6.7.3p8).
3506  const ArrayType *PrettyArrayType = getAsArrayType(Ty);
3507  assert(PrettyArrayType && "Not an array type!");
3508
3509  QualType PtrTy = getPointerType(PrettyArrayType->getElementType());
3510
3511  // int x[restrict 4] ->  int *restrict
3512  return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers());
3513}
3514
3515QualType ASTContext::getBaseElementType(const ArrayType *array) const {
3516  return getBaseElementType(array->getElementType());
3517}
3518
3519QualType ASTContext::getBaseElementType(QualType type) const {
3520  Qualifiers qs;
3521  while (true) {
3522    SplitQualType split = type.getSplitDesugaredType();
3523    const ArrayType *array = split.Ty->getAsArrayTypeUnsafe();
3524    if (!array) break;
3525
3526    type = array->getElementType();
3527    qs.addConsistentQualifiers(split.Quals);
3528  }
3529
3530  return getQualifiedType(type, qs);
3531}
3532
3533/// getConstantArrayElementCount - Returns number of constant array elements.
3534uint64_t
3535ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA)  const {
3536  uint64_t ElementCount = 1;
3537  do {
3538    ElementCount *= CA->getSize().getZExtValue();
3539    CA = dyn_cast<ConstantArrayType>(CA->getElementType());
3540  } while (CA);
3541  return ElementCount;
3542}
3543
3544/// getFloatingRank - Return a relative rank for floating point types.
3545/// This routine will assert if passed a built-in type that isn't a float.
3546static FloatingRank getFloatingRank(QualType T) {
3547  if (const ComplexType *CT = T->getAs<ComplexType>())
3548    return getFloatingRank(CT->getElementType());
3549
3550  assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type");
3551  switch (T->getAs<BuiltinType>()->getKind()) {
3552  default: llvm_unreachable("getFloatingRank(): not a floating type");
3553  case BuiltinType::Half:       return HalfRank;
3554  case BuiltinType::Float:      return FloatRank;
3555  case BuiltinType::Double:     return DoubleRank;
3556  case BuiltinType::LongDouble: return LongDoubleRank;
3557  }
3558}
3559
3560/// getFloatingTypeOfSizeWithinDomain - Returns a real floating
3561/// point or a complex type (based on typeDomain/typeSize).
3562/// 'typeDomain' is a real floating point or complex type.
3563/// 'typeSize' is a real floating point or complex type.
3564QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size,
3565                                                       QualType Domain) const {
3566  FloatingRank EltRank = getFloatingRank(Size);
3567  if (Domain->isComplexType()) {
3568    switch (EltRank) {
3569    case HalfRank: llvm_unreachable("Complex half is not supported");
3570    case FloatRank:      return FloatComplexTy;
3571    case DoubleRank:     return DoubleComplexTy;
3572    case LongDoubleRank: return LongDoubleComplexTy;
3573    }
3574  }
3575
3576  assert(Domain->isRealFloatingType() && "Unknown domain!");
3577  switch (EltRank) {
3578  case HalfRank: llvm_unreachable("Half ranks are not valid here");
3579  case FloatRank:      return FloatTy;
3580  case DoubleRank:     return DoubleTy;
3581  case LongDoubleRank: return LongDoubleTy;
3582  }
3583  llvm_unreachable("getFloatingRank(): illegal value for rank");
3584}
3585
3586/// getFloatingTypeOrder - Compare the rank of the two specified floating
3587/// point types, ignoring the domain of the type (i.e. 'double' ==
3588/// '_Complex double').  If LHS > RHS, return 1.  If LHS == RHS, return 0. If
3589/// LHS < RHS, return -1.
3590int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) const {
3591  FloatingRank LHSR = getFloatingRank(LHS);
3592  FloatingRank RHSR = getFloatingRank(RHS);
3593
3594  if (LHSR == RHSR)
3595    return 0;
3596  if (LHSR > RHSR)
3597    return 1;
3598  return -1;
3599}
3600
3601/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This
3602/// routine will assert if passed a built-in type that isn't an integer or enum,
3603/// or if it is not canonicalized.
3604unsigned ASTContext::getIntegerRank(const Type *T) const {
3605  assert(T->isCanonicalUnqualified() && "T should be canonicalized");
3606
3607  switch (cast<BuiltinType>(T)->getKind()) {
3608  default: llvm_unreachable("getIntegerRank(): not a built-in integer");
3609  case BuiltinType::Bool:
3610    return 1 + (getIntWidth(BoolTy) << 3);
3611  case BuiltinType::Char_S:
3612  case BuiltinType::Char_U:
3613  case BuiltinType::SChar:
3614  case BuiltinType::UChar:
3615    return 2 + (getIntWidth(CharTy) << 3);
3616  case BuiltinType::Short:
3617  case BuiltinType::UShort:
3618    return 3 + (getIntWidth(ShortTy) << 3);
3619  case BuiltinType::Int:
3620  case BuiltinType::UInt:
3621    return 4 + (getIntWidth(IntTy) << 3);
3622  case BuiltinType::Long:
3623  case BuiltinType::ULong:
3624    return 5 + (getIntWidth(LongTy) << 3);
3625  case BuiltinType::LongLong:
3626  case BuiltinType::ULongLong:
3627    return 6 + (getIntWidth(LongLongTy) << 3);
3628  case BuiltinType::Int128:
3629  case BuiltinType::UInt128:
3630    return 7 + (getIntWidth(Int128Ty) << 3);
3631  }
3632}
3633
3634/// \brief Whether this is a promotable bitfield reference according
3635/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions).
3636///
3637/// \returns the type this bit-field will promote to, or NULL if no
3638/// promotion occurs.
3639QualType ASTContext::isPromotableBitField(Expr *E) const {
3640  if (E->isTypeDependent() || E->isValueDependent())
3641    return QualType();
3642
3643  FieldDecl *Field = E->getBitField();
3644  if (!Field)
3645    return QualType();
3646
3647  QualType FT = Field->getType();
3648
3649  uint64_t BitWidth = Field->getBitWidthValue(*this);
3650  uint64_t IntSize = getTypeSize(IntTy);
3651  // GCC extension compatibility: if the bit-field size is less than or equal
3652  // to the size of int, it gets promoted no matter what its type is.
3653  // For instance, unsigned long bf : 4 gets promoted to signed int.
3654  if (BitWidth < IntSize)
3655    return IntTy;
3656
3657  if (BitWidth == IntSize)
3658    return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy;
3659
3660  // Types bigger than int are not subject to promotions, and therefore act
3661  // like the base type.
3662  // FIXME: This doesn't quite match what gcc does, but what gcc does here
3663  // is ridiculous.
3664  return QualType();
3665}
3666
3667/// getPromotedIntegerType - Returns the type that Promotable will
3668/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable
3669/// integer type.
3670QualType ASTContext::getPromotedIntegerType(QualType Promotable) const {
3671  assert(!Promotable.isNull());
3672  assert(Promotable->isPromotableIntegerType());
3673  if (const EnumType *ET = Promotable->getAs<EnumType>())
3674    return ET->getDecl()->getPromotionType();
3675
3676  if (const BuiltinType *BT = Promotable->getAs<BuiltinType>()) {
3677    // C++ [conv.prom]: A prvalue of type char16_t, char32_t, or wchar_t
3678    // (3.9.1) can be converted to a prvalue of the first of the following
3679    // types that can represent all the values of its underlying type:
3680    // int, unsigned int, long int, unsigned long int, long long int, or
3681    // unsigned long long int [...]
3682    // FIXME: Is there some better way to compute this?
3683    if (BT->getKind() == BuiltinType::WChar_S ||
3684        BT->getKind() == BuiltinType::WChar_U ||
3685        BT->getKind() == BuiltinType::Char16 ||
3686        BT->getKind() == BuiltinType::Char32) {
3687      bool FromIsSigned = BT->getKind() == BuiltinType::WChar_S;
3688      uint64_t FromSize = getTypeSize(BT);
3689      QualType PromoteTypes[] = { IntTy, UnsignedIntTy, LongTy, UnsignedLongTy,
3690                                  LongLongTy, UnsignedLongLongTy };
3691      for (size_t Idx = 0; Idx < llvm::array_lengthof(PromoteTypes); ++Idx) {
3692        uint64_t ToSize = getTypeSize(PromoteTypes[Idx]);
3693        if (FromSize < ToSize ||
3694            (FromSize == ToSize &&
3695             FromIsSigned == PromoteTypes[Idx]->isSignedIntegerType()))
3696          return PromoteTypes[Idx];
3697      }
3698      llvm_unreachable("char type should fit into long long");
3699    }
3700  }
3701
3702  // At this point, we should have a signed or unsigned integer type.
3703  if (Promotable->isSignedIntegerType())
3704    return IntTy;
3705  uint64_t PromotableSize = getTypeSize(Promotable);
3706  uint64_t IntSize = getTypeSize(IntTy);
3707  assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize);
3708  return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy;
3709}
3710
3711/// \brief Recurses in pointer/array types until it finds an objc retainable
3712/// type and returns its ownership.
3713Qualifiers::ObjCLifetime ASTContext::getInnerObjCOwnership(QualType T) const {
3714  while (!T.isNull()) {
3715    if (T.getObjCLifetime() != Qualifiers::OCL_None)
3716      return T.getObjCLifetime();
3717    if (T->isArrayType())
3718      T = getBaseElementType(T);
3719    else if (const PointerType *PT = T->getAs<PointerType>())
3720      T = PT->getPointeeType();
3721    else if (const ReferenceType *RT = T->getAs<ReferenceType>())
3722      T = RT->getPointeeType();
3723    else
3724      break;
3725  }
3726
3727  return Qualifiers::OCL_None;
3728}
3729
3730/// getIntegerTypeOrder - Returns the highest ranked integer type:
3731/// C99 6.3.1.8p1.  If LHS > RHS, return 1.  If LHS == RHS, return 0. If
3732/// LHS < RHS, return -1.
3733int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) const {
3734  const Type *LHSC = getCanonicalType(LHS).getTypePtr();
3735  const Type *RHSC = getCanonicalType(RHS).getTypePtr();
3736  if (LHSC == RHSC) return 0;
3737
3738  bool LHSUnsigned = LHSC->isUnsignedIntegerType();
3739  bool RHSUnsigned = RHSC->isUnsignedIntegerType();
3740
3741  unsigned LHSRank = getIntegerRank(LHSC);
3742  unsigned RHSRank = getIntegerRank(RHSC);
3743
3744  if (LHSUnsigned == RHSUnsigned) {  // Both signed or both unsigned.
3745    if (LHSRank == RHSRank) return 0;
3746    return LHSRank > RHSRank ? 1 : -1;
3747  }
3748
3749  // Otherwise, the LHS is signed and the RHS is unsigned or visa versa.
3750  if (LHSUnsigned) {
3751    // If the unsigned [LHS] type is larger, return it.
3752    if (LHSRank >= RHSRank)
3753      return 1;
3754
3755    // If the signed type can represent all values of the unsigned type, it
3756    // wins.  Because we are dealing with 2's complement and types that are
3757    // powers of two larger than each other, this is always safe.
3758    return -1;
3759  }
3760
3761  // If the unsigned [RHS] type is larger, return it.
3762  if (RHSRank >= LHSRank)
3763    return -1;
3764
3765  // If the signed type can represent all values of the unsigned type, it
3766  // wins.  Because we are dealing with 2's complement and types that are
3767  // powers of two larger than each other, this is always safe.
3768  return 1;
3769}
3770
3771static RecordDecl *
3772CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK,
3773                 DeclContext *DC, IdentifierInfo *Id) {
3774  SourceLocation Loc;
3775  if (Ctx.getLangOptions().CPlusPlus)
3776    return CXXRecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
3777  else
3778    return RecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
3779}
3780
3781// getCFConstantStringType - Return the type used for constant CFStrings.
3782QualType ASTContext::getCFConstantStringType() const {
3783  if (!CFConstantStringTypeDecl) {
3784    CFConstantStringTypeDecl =
3785      CreateRecordDecl(*this, TTK_Struct, TUDecl,
3786                       &Idents.get("NSConstantString"));
3787    CFConstantStringTypeDecl->startDefinition();
3788
3789    QualType FieldTypes[4];
3790
3791    // const int *isa;
3792    FieldTypes[0] = getPointerType(IntTy.withConst());
3793    // int flags;
3794    FieldTypes[1] = IntTy;
3795    // const char *str;
3796    FieldTypes[2] = getPointerType(CharTy.withConst());
3797    // long length;
3798    FieldTypes[3] = LongTy;
3799
3800    // Create fields
3801    for (unsigned i = 0; i < 4; ++i) {
3802      FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl,
3803                                           SourceLocation(),
3804                                           SourceLocation(), 0,
3805                                           FieldTypes[i], /*TInfo=*/0,
3806                                           /*BitWidth=*/0,
3807                                           /*Mutable=*/false,
3808                                           /*HasInit=*/false);
3809      Field->setAccess(AS_public);
3810      CFConstantStringTypeDecl->addDecl(Field);
3811    }
3812
3813    CFConstantStringTypeDecl->completeDefinition();
3814  }
3815
3816  return getTagDeclType(CFConstantStringTypeDecl);
3817}
3818
3819void ASTContext::setCFConstantStringType(QualType T) {
3820  const RecordType *Rec = T->getAs<RecordType>();
3821  assert(Rec && "Invalid CFConstantStringType");
3822  CFConstantStringTypeDecl = Rec->getDecl();
3823}
3824
3825QualType ASTContext::getBlockDescriptorType() const {
3826  if (BlockDescriptorType)
3827    return getTagDeclType(BlockDescriptorType);
3828
3829  RecordDecl *T;
3830  // FIXME: Needs the FlagAppleBlock bit.
3831  T = CreateRecordDecl(*this, TTK_Struct, TUDecl,
3832                       &Idents.get("__block_descriptor"));
3833  T->startDefinition();
3834
3835  QualType FieldTypes[] = {
3836    UnsignedLongTy,
3837    UnsignedLongTy,
3838  };
3839
3840  const char *FieldNames[] = {
3841    "reserved",
3842    "Size"
3843  };
3844
3845  for (size_t i = 0; i < 2; ++i) {
3846    FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(),
3847                                         SourceLocation(),
3848                                         &Idents.get(FieldNames[i]),
3849                                         FieldTypes[i], /*TInfo=*/0,
3850                                         /*BitWidth=*/0,
3851                                         /*Mutable=*/false,
3852                                         /*HasInit=*/false);
3853    Field->setAccess(AS_public);
3854    T->addDecl(Field);
3855  }
3856
3857  T->completeDefinition();
3858
3859  BlockDescriptorType = T;
3860
3861  return getTagDeclType(BlockDescriptorType);
3862}
3863
3864QualType ASTContext::getBlockDescriptorExtendedType() const {
3865  if (BlockDescriptorExtendedType)
3866    return getTagDeclType(BlockDescriptorExtendedType);
3867
3868  RecordDecl *T;
3869  // FIXME: Needs the FlagAppleBlock bit.
3870  T = CreateRecordDecl(*this, TTK_Struct, TUDecl,
3871                       &Idents.get("__block_descriptor_withcopydispose"));
3872  T->startDefinition();
3873
3874  QualType FieldTypes[] = {
3875    UnsignedLongTy,
3876    UnsignedLongTy,
3877    getPointerType(VoidPtrTy),
3878    getPointerType(VoidPtrTy)
3879  };
3880
3881  const char *FieldNames[] = {
3882    "reserved",
3883    "Size",
3884    "CopyFuncPtr",
3885    "DestroyFuncPtr"
3886  };
3887
3888  for (size_t i = 0; i < 4; ++i) {
3889    FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(),
3890                                         SourceLocation(),
3891                                         &Idents.get(FieldNames[i]),
3892                                         FieldTypes[i], /*TInfo=*/0,
3893                                         /*BitWidth=*/0,
3894                                         /*Mutable=*/false,
3895                                         /*HasInit=*/false);
3896    Field->setAccess(AS_public);
3897    T->addDecl(Field);
3898  }
3899
3900  T->completeDefinition();
3901
3902  BlockDescriptorExtendedType = T;
3903
3904  return getTagDeclType(BlockDescriptorExtendedType);
3905}
3906
3907bool ASTContext::BlockRequiresCopying(QualType Ty) const {
3908  if (Ty->isObjCRetainableType())
3909    return true;
3910  if (getLangOptions().CPlusPlus) {
3911    if (const RecordType *RT = Ty->getAs<RecordType>()) {
3912      CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
3913      return RD->hasConstCopyConstructor();
3914
3915    }
3916  }
3917  return false;
3918}
3919
3920QualType
3921ASTContext::BuildByRefType(StringRef DeclName, QualType Ty) const {
3922  //  type = struct __Block_byref_1_X {
3923  //    void *__isa;
3924  //    struct __Block_byref_1_X *__forwarding;
3925  //    unsigned int __flags;
3926  //    unsigned int __size;
3927  //    void *__copy_helper;            // as needed
3928  //    void *__destroy_help            // as needed
3929  //    int X;
3930  //  } *
3931
3932  bool HasCopyAndDispose = BlockRequiresCopying(Ty);
3933
3934  // FIXME: Move up
3935  SmallString<36> Name;
3936  llvm::raw_svector_ostream(Name) << "__Block_byref_" <<
3937                                  ++UniqueBlockByRefTypeID << '_' << DeclName;
3938  RecordDecl *T;
3939  T = CreateRecordDecl(*this, TTK_Struct, TUDecl, &Idents.get(Name.str()));
3940  T->startDefinition();
3941  QualType Int32Ty = IntTy;
3942  assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported");
3943  QualType FieldTypes[] = {
3944    getPointerType(VoidPtrTy),
3945    getPointerType(getTagDeclType(T)),
3946    Int32Ty,
3947    Int32Ty,
3948    getPointerType(VoidPtrTy),
3949    getPointerType(VoidPtrTy),
3950    Ty
3951  };
3952
3953  StringRef FieldNames[] = {
3954    "__isa",
3955    "__forwarding",
3956    "__flags",
3957    "__size",
3958    "__copy_helper",
3959    "__destroy_helper",
3960    DeclName,
3961  };
3962
3963  for (size_t i = 0; i < 7; ++i) {
3964    if (!HasCopyAndDispose && i >=4 && i <= 5)
3965      continue;
3966    FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(),
3967                                         SourceLocation(),
3968                                         &Idents.get(FieldNames[i]),
3969                                         FieldTypes[i], /*TInfo=*/0,
3970                                         /*BitWidth=*/0, /*Mutable=*/false,
3971                                         /*HasInit=*/false);
3972    Field->setAccess(AS_public);
3973    T->addDecl(Field);
3974  }
3975
3976  T->completeDefinition();
3977
3978  return getPointerType(getTagDeclType(T));
3979}
3980
3981TypedefDecl *ASTContext::getObjCInstanceTypeDecl() {
3982  if (!ObjCInstanceTypeDecl)
3983    ObjCInstanceTypeDecl = TypedefDecl::Create(*this,
3984                                               getTranslationUnitDecl(),
3985                                               SourceLocation(),
3986                                               SourceLocation(),
3987                                               &Idents.get("instancetype"),
3988                                     getTrivialTypeSourceInfo(getObjCIdType()));
3989  return ObjCInstanceTypeDecl;
3990}
3991
3992// This returns true if a type has been typedefed to BOOL:
3993// typedef <type> BOOL;
3994static bool isTypeTypedefedAsBOOL(QualType T) {
3995  if (const TypedefType *TT = dyn_cast<TypedefType>(T))
3996    if (IdentifierInfo *II = TT->getDecl()->getIdentifier())
3997      return II->isStr("BOOL");
3998
3999  return false;
4000}
4001
4002/// getObjCEncodingTypeSize returns size of type for objective-c encoding
4003/// purpose.
4004CharUnits ASTContext::getObjCEncodingTypeSize(QualType type) const {
4005  if (!type->isIncompleteArrayType() && type->isIncompleteType())
4006    return CharUnits::Zero();
4007
4008  CharUnits sz = getTypeSizeInChars(type);
4009
4010  // Make all integer and enum types at least as large as an int
4011  if (sz.isPositive() && type->isIntegralOrEnumerationType())
4012    sz = std::max(sz, getTypeSizeInChars(IntTy));
4013  // Treat arrays as pointers, since that's how they're passed in.
4014  else if (type->isArrayType())
4015    sz = getTypeSizeInChars(VoidPtrTy);
4016  return sz;
4017}
4018
4019static inline
4020std::string charUnitsToString(const CharUnits &CU) {
4021  return llvm::itostr(CU.getQuantity());
4022}
4023
4024/// getObjCEncodingForBlock - Return the encoded type for this block
4025/// declaration.
4026std::string ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr) const {
4027  std::string S;
4028
4029  const BlockDecl *Decl = Expr->getBlockDecl();
4030  QualType BlockTy =
4031      Expr->getType()->getAs<BlockPointerType>()->getPointeeType();
4032  // Encode result type.
4033  getObjCEncodingForType(BlockTy->getAs<FunctionType>()->getResultType(), S);
4034  // Compute size of all parameters.
4035  // Start with computing size of a pointer in number of bytes.
4036  // FIXME: There might(should) be a better way of doing this computation!
4037  SourceLocation Loc;
4038  CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy);
4039  CharUnits ParmOffset = PtrSize;
4040  for (BlockDecl::param_const_iterator PI = Decl->param_begin(),
4041       E = Decl->param_end(); PI != E; ++PI) {
4042    QualType PType = (*PI)->getType();
4043    CharUnits sz = getObjCEncodingTypeSize(PType);
4044    assert (sz.isPositive() && "BlockExpr - Incomplete param type");
4045    ParmOffset += sz;
4046  }
4047  // Size of the argument frame
4048  S += charUnitsToString(ParmOffset);
4049  // Block pointer and offset.
4050  S += "@?0";
4051
4052  // Argument types.
4053  ParmOffset = PtrSize;
4054  for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E =
4055       Decl->param_end(); PI != E; ++PI) {
4056    ParmVarDecl *PVDecl = *PI;
4057    QualType PType = PVDecl->getOriginalType();
4058    if (const ArrayType *AT =
4059          dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) {
4060      // Use array's original type only if it has known number of
4061      // elements.
4062      if (!isa<ConstantArrayType>(AT))
4063        PType = PVDecl->getType();
4064    } else if (PType->isFunctionType())
4065      PType = PVDecl->getType();
4066    getObjCEncodingForType(PType, S);
4067    S += charUnitsToString(ParmOffset);
4068    ParmOffset += getObjCEncodingTypeSize(PType);
4069  }
4070
4071  return S;
4072}
4073
4074bool ASTContext::getObjCEncodingForFunctionDecl(const FunctionDecl *Decl,
4075                                                std::string& S) {
4076  // Encode result type.
4077  getObjCEncodingForType(Decl->getResultType(), S);
4078  CharUnits ParmOffset;
4079  // Compute size of all parameters.
4080  for (FunctionDecl::param_const_iterator PI = Decl->param_begin(),
4081       E = Decl->param_end(); PI != E; ++PI) {
4082    QualType PType = (*PI)->getType();
4083    CharUnits sz = getObjCEncodingTypeSize(PType);
4084    if (sz.isZero())
4085      return true;
4086
4087    assert (sz.isPositive() &&
4088        "getObjCEncodingForFunctionDecl - Incomplete param type");
4089    ParmOffset += sz;
4090  }
4091  S += charUnitsToString(ParmOffset);
4092  ParmOffset = CharUnits::Zero();
4093
4094  // Argument types.
4095  for (FunctionDecl::param_const_iterator PI = Decl->param_begin(),
4096       E = Decl->param_end(); PI != E; ++PI) {
4097    ParmVarDecl *PVDecl = *PI;
4098    QualType PType = PVDecl->getOriginalType();
4099    if (const ArrayType *AT =
4100          dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) {
4101      // Use array's original type only if it has known number of
4102      // elements.
4103      if (!isa<ConstantArrayType>(AT))
4104        PType = PVDecl->getType();
4105    } else if (PType->isFunctionType())
4106      PType = PVDecl->getType();
4107    getObjCEncodingForType(PType, S);
4108    S += charUnitsToString(ParmOffset);
4109    ParmOffset += getObjCEncodingTypeSize(PType);
4110  }
4111
4112  return false;
4113}
4114
4115/// getObjCEncodingForMethodParameter - Return the encoded type for a single
4116/// method parameter or return type. If Extended, include class names and
4117/// block object types.
4118void ASTContext::getObjCEncodingForMethodParameter(Decl::ObjCDeclQualifier QT,
4119                                                   QualType T, std::string& S,
4120                                                   bool Extended) const {
4121  // Encode type qualifer, 'in', 'inout', etc. for the parameter.
4122  getObjCEncodingForTypeQualifier(QT, S);
4123  // Encode parameter type.
4124  getObjCEncodingForTypeImpl(T, S, true, true, 0,
4125                             true     /*OutermostType*/,
4126                             false    /*EncodingProperty*/,
4127                             false    /*StructField*/,
4128                             Extended /*EncodeBlockParameters*/,
4129                             Extended /*EncodeClassNames*/);
4130}
4131
4132/// getObjCEncodingForMethodDecl - Return the encoded type for this method
4133/// declaration.
4134bool ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl,
4135                                              std::string& S,
4136                                              bool Extended) const {
4137  // FIXME: This is not very efficient.
4138  // Encode return type.
4139  getObjCEncodingForMethodParameter(Decl->getObjCDeclQualifier(),
4140                                    Decl->getResultType(), S, Extended);
4141  // Compute size of all parameters.
4142  // Start with computing size of a pointer in number of bytes.
4143  // FIXME: There might(should) be a better way of doing this computation!
4144  SourceLocation Loc;
4145  CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy);
4146  // The first two arguments (self and _cmd) are pointers; account for
4147  // their size.
4148  CharUnits ParmOffset = 2 * PtrSize;
4149  for (ObjCMethodDecl::param_const_iterator PI = Decl->param_begin(),
4150       E = Decl->sel_param_end(); PI != E; ++PI) {
4151    QualType PType = (*PI)->getType();
4152    CharUnits sz = getObjCEncodingTypeSize(PType);
4153    if (sz.isZero())
4154      return true;
4155
4156    assert (sz.isPositive() &&
4157        "getObjCEncodingForMethodDecl - Incomplete param type");
4158    ParmOffset += sz;
4159  }
4160  S += charUnitsToString(ParmOffset);
4161  S += "@0:";
4162  S += charUnitsToString(PtrSize);
4163
4164  // Argument types.
4165  ParmOffset = 2 * PtrSize;
4166  for (ObjCMethodDecl::param_const_iterator PI = Decl->param_begin(),
4167       E = Decl->sel_param_end(); PI != E; ++PI) {
4168    const ParmVarDecl *PVDecl = *PI;
4169    QualType PType = PVDecl->getOriginalType();
4170    if (const ArrayType *AT =
4171          dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) {
4172      // Use array's original type only if it has known number of
4173      // elements.
4174      if (!isa<ConstantArrayType>(AT))
4175        PType = PVDecl->getType();
4176    } else if (PType->isFunctionType())
4177      PType = PVDecl->getType();
4178    getObjCEncodingForMethodParameter(PVDecl->getObjCDeclQualifier(),
4179                                      PType, S, Extended);
4180    S += charUnitsToString(ParmOffset);
4181    ParmOffset += getObjCEncodingTypeSize(PType);
4182  }
4183
4184  return false;
4185}
4186
4187/// getObjCEncodingForPropertyDecl - Return the encoded type for this
4188/// property declaration. If non-NULL, Container must be either an
4189/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be
4190/// NULL when getting encodings for protocol properties.
4191/// Property attributes are stored as a comma-delimited C string. The simple
4192/// attributes readonly and bycopy are encoded as single characters. The
4193/// parametrized attributes, getter=name, setter=name, and ivar=name, are
4194/// encoded as single characters, followed by an identifier. Property types
4195/// are also encoded as a parametrized attribute. The characters used to encode
4196/// these attributes are defined by the following enumeration:
4197/// @code
4198/// enum PropertyAttributes {
4199/// kPropertyReadOnly = 'R',   // property is read-only.
4200/// kPropertyBycopy = 'C',     // property is a copy of the value last assigned
4201/// kPropertyByref = '&',  // property is a reference to the value last assigned
4202/// kPropertyDynamic = 'D',    // property is dynamic
4203/// kPropertyGetter = 'G',     // followed by getter selector name
4204/// kPropertySetter = 'S',     // followed by setter selector name
4205/// kPropertyInstanceVariable = 'V'  // followed by instance variable  name
4206/// kPropertyType = 't'              // followed by old-style type encoding.
4207/// kPropertyWeak = 'W'              // 'weak' property
4208/// kPropertyStrong = 'P'            // property GC'able
4209/// kPropertyNonAtomic = 'N'         // property non-atomic
4210/// };
4211/// @endcode
4212void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD,
4213                                                const Decl *Container,
4214                                                std::string& S) const {
4215  // Collect information from the property implementation decl(s).
4216  bool Dynamic = false;
4217  ObjCPropertyImplDecl *SynthesizePID = 0;
4218
4219  // FIXME: Duplicated code due to poor abstraction.
4220  if (Container) {
4221    if (const ObjCCategoryImplDecl *CID =
4222        dyn_cast<ObjCCategoryImplDecl>(Container)) {
4223      for (ObjCCategoryImplDecl::propimpl_iterator
4224             i = CID->propimpl_begin(), e = CID->propimpl_end();
4225           i != e; ++i) {
4226        ObjCPropertyImplDecl *PID = *i;
4227        if (PID->getPropertyDecl() == PD) {
4228          if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) {
4229            Dynamic = true;
4230          } else {
4231            SynthesizePID = PID;
4232          }
4233        }
4234      }
4235    } else {
4236      const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container);
4237      for (ObjCCategoryImplDecl::propimpl_iterator
4238             i = OID->propimpl_begin(), e = OID->propimpl_end();
4239           i != e; ++i) {
4240        ObjCPropertyImplDecl *PID = *i;
4241        if (PID->getPropertyDecl() == PD) {
4242          if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) {
4243            Dynamic = true;
4244          } else {
4245            SynthesizePID = PID;
4246          }
4247        }
4248      }
4249    }
4250  }
4251
4252  // FIXME: This is not very efficient.
4253  S = "T";
4254
4255  // Encode result type.
4256  // GCC has some special rules regarding encoding of properties which
4257  // closely resembles encoding of ivars.
4258  getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0,
4259                             true /* outermost type */,
4260                             true /* encoding for property */);
4261
4262  if (PD->isReadOnly()) {
4263    S += ",R";
4264  } else {
4265    switch (PD->getSetterKind()) {
4266    case ObjCPropertyDecl::Assign: break;
4267    case ObjCPropertyDecl::Copy:   S += ",C"; break;
4268    case ObjCPropertyDecl::Retain: S += ",&"; break;
4269    case ObjCPropertyDecl::Weak:   S += ",W"; break;
4270    }
4271  }
4272
4273  // It really isn't clear at all what this means, since properties
4274  // are "dynamic by default".
4275  if (Dynamic)
4276    S += ",D";
4277
4278  if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic)
4279    S += ",N";
4280
4281  if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
4282    S += ",G";
4283    S += PD->getGetterName().getAsString();
4284  }
4285
4286  if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
4287    S += ",S";
4288    S += PD->getSetterName().getAsString();
4289  }
4290
4291  if (SynthesizePID) {
4292    const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl();
4293    S += ",V";
4294    S += OID->getNameAsString();
4295  }
4296
4297  // FIXME: OBJCGC: weak & strong
4298}
4299
4300/// getLegacyIntegralTypeEncoding -
4301/// Another legacy compatibility encoding: 32-bit longs are encoded as
4302/// 'l' or 'L' , but not always.  For typedefs, we need to use
4303/// 'i' or 'I' instead if encoding a struct field, or a pointer!
4304///
4305void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const {
4306  if (isa<TypedefType>(PointeeTy.getTypePtr())) {
4307    if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) {
4308      if (BT->getKind() == BuiltinType::ULong && getIntWidth(PointeeTy) == 32)
4309        PointeeTy = UnsignedIntTy;
4310      else
4311        if (BT->getKind() == BuiltinType::Long && getIntWidth(PointeeTy) == 32)
4312          PointeeTy = IntTy;
4313    }
4314  }
4315}
4316
4317void ASTContext::getObjCEncodingForType(QualType T, std::string& S,
4318                                        const FieldDecl *Field) const {
4319  // We follow the behavior of gcc, expanding structures which are
4320  // directly pointed to, and expanding embedded structures. Note that
4321  // these rules are sufficient to prevent recursive encoding of the
4322  // same type.
4323  getObjCEncodingForTypeImpl(T, S, true, true, Field,
4324                             true /* outermost type */);
4325}
4326
4327static char ObjCEncodingForPrimitiveKind(const ASTContext *C, QualType T) {
4328    switch (T->getAs<BuiltinType>()->getKind()) {
4329    default: llvm_unreachable("Unhandled builtin type kind");
4330    case BuiltinType::Void:       return 'v';
4331    case BuiltinType::Bool:       return 'B';
4332    case BuiltinType::Char_U:
4333    case BuiltinType::UChar:      return 'C';
4334    case BuiltinType::UShort:     return 'S';
4335    case BuiltinType::UInt:       return 'I';
4336    case BuiltinType::ULong:
4337        return C->getIntWidth(T) == 32 ? 'L' : 'Q';
4338    case BuiltinType::UInt128:    return 'T';
4339    case BuiltinType::ULongLong:  return 'Q';
4340    case BuiltinType::Char_S:
4341    case BuiltinType::SChar:      return 'c';
4342    case BuiltinType::Short:      return 's';
4343    case BuiltinType::WChar_S:
4344    case BuiltinType::WChar_U:
4345    case BuiltinType::Int:        return 'i';
4346    case BuiltinType::Long:
4347      return C->getIntWidth(T) == 32 ? 'l' : 'q';
4348    case BuiltinType::LongLong:   return 'q';
4349    case BuiltinType::Int128:     return 't';
4350    case BuiltinType::Float:      return 'f';
4351    case BuiltinType::Double:     return 'd';
4352    case BuiltinType::LongDouble: return 'D';
4353    }
4354}
4355
4356static char ObjCEncodingForEnumType(const ASTContext *C, const EnumType *ET) {
4357  EnumDecl *Enum = ET->getDecl();
4358
4359  // The encoding of an non-fixed enum type is always 'i', regardless of size.
4360  if (!Enum->isFixed())
4361    return 'i';
4362
4363  // The encoding of a fixed enum type matches its fixed underlying type.
4364  return ObjCEncodingForPrimitiveKind(C, Enum->getIntegerType());
4365}
4366
4367static void EncodeBitField(const ASTContext *Ctx, std::string& S,
4368                           QualType T, const FieldDecl *FD) {
4369  assert(FD->isBitField() && "not a bitfield - getObjCEncodingForTypeImpl");
4370  S += 'b';
4371  // The NeXT runtime encodes bit fields as b followed by the number of bits.
4372  // The GNU runtime requires more information; bitfields are encoded as b,
4373  // then the offset (in bits) of the first element, then the type of the
4374  // bitfield, then the size in bits.  For example, in this structure:
4375  //
4376  // struct
4377  // {
4378  //    int integer;
4379  //    int flags:2;
4380  // };
4381  // On a 32-bit system, the encoding for flags would be b2 for the NeXT
4382  // runtime, but b32i2 for the GNU runtime.  The reason for this extra
4383  // information is not especially sensible, but we're stuck with it for
4384  // compatibility with GCC, although providing it breaks anything that
4385  // actually uses runtime introspection and wants to work on both runtimes...
4386  if (!Ctx->getLangOptions().NeXTRuntime) {
4387    const RecordDecl *RD = FD->getParent();
4388    const ASTRecordLayout &RL = Ctx->getASTRecordLayout(RD);
4389    S += llvm::utostr(RL.getFieldOffset(FD->getFieldIndex()));
4390    if (const EnumType *ET = T->getAs<EnumType>())
4391      S += ObjCEncodingForEnumType(Ctx, ET);
4392    else
4393      S += ObjCEncodingForPrimitiveKind(Ctx, T);
4394  }
4395  S += llvm::utostr(FD->getBitWidthValue(*Ctx));
4396}
4397
4398// FIXME: Use SmallString for accumulating string.
4399void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S,
4400                                            bool ExpandPointedToStructures,
4401                                            bool ExpandStructures,
4402                                            const FieldDecl *FD,
4403                                            bool OutermostType,
4404                                            bool EncodingProperty,
4405                                            bool StructField,
4406                                            bool EncodeBlockParameters,
4407                                            bool EncodeClassNames) const {
4408  if (T->getAs<BuiltinType>()) {
4409    if (FD && FD->isBitField())
4410      return EncodeBitField(this, S, T, FD);
4411    S += ObjCEncodingForPrimitiveKind(this, T);
4412    return;
4413  }
4414
4415  if (const ComplexType *CT = T->getAs<ComplexType>()) {
4416    S += 'j';
4417    getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false,
4418                               false);
4419    return;
4420  }
4421
4422  // encoding for pointer or r3eference types.
4423  QualType PointeeTy;
4424  if (const PointerType *PT = T->getAs<PointerType>()) {
4425    if (PT->isObjCSelType()) {
4426      S += ':';
4427      return;
4428    }
4429    PointeeTy = PT->getPointeeType();
4430  }
4431  else if (const ReferenceType *RT = T->getAs<ReferenceType>())
4432    PointeeTy = RT->getPointeeType();
4433  if (!PointeeTy.isNull()) {
4434    bool isReadOnly = false;
4435    // For historical/compatibility reasons, the read-only qualifier of the
4436    // pointee gets emitted _before_ the '^'.  The read-only qualifier of
4437    // the pointer itself gets ignored, _unless_ we are looking at a typedef!
4438    // Also, do not emit the 'r' for anything but the outermost type!
4439    if (isa<TypedefType>(T.getTypePtr())) {
4440      if (OutermostType && T.isConstQualified()) {
4441        isReadOnly = true;
4442        S += 'r';
4443      }
4444    } else if (OutermostType) {
4445      QualType P = PointeeTy;
4446      while (P->getAs<PointerType>())
4447        P = P->getAs<PointerType>()->getPointeeType();
4448      if (P.isConstQualified()) {
4449        isReadOnly = true;
4450        S += 'r';
4451      }
4452    }
4453    if (isReadOnly) {
4454      // Another legacy compatibility encoding. Some ObjC qualifier and type
4455      // combinations need to be rearranged.
4456      // Rewrite "in const" from "nr" to "rn"
4457      if (StringRef(S).endswith("nr"))
4458        S.replace(S.end()-2, S.end(), "rn");
4459    }
4460
4461    if (PointeeTy->isCharType()) {
4462      // char pointer types should be encoded as '*' unless it is a
4463      // type that has been typedef'd to 'BOOL'.
4464      if (!isTypeTypedefedAsBOOL(PointeeTy)) {
4465        S += '*';
4466        return;
4467      }
4468    } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) {
4469      // GCC binary compat: Need to convert "struct objc_class *" to "#".
4470      if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) {
4471        S += '#';
4472        return;
4473      }
4474      // GCC binary compat: Need to convert "struct objc_object *" to "@".
4475      if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) {
4476        S += '@';
4477        return;
4478      }
4479      // fall through...
4480    }
4481    S += '^';
4482    getLegacyIntegralTypeEncoding(PointeeTy);
4483
4484    getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures,
4485                               NULL);
4486    return;
4487  }
4488
4489  if (const ArrayType *AT =
4490      // Ignore type qualifiers etc.
4491        dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) {
4492    if (isa<IncompleteArrayType>(AT) && !StructField) {
4493      // Incomplete arrays are encoded as a pointer to the array element.
4494      S += '^';
4495
4496      getObjCEncodingForTypeImpl(AT->getElementType(), S,
4497                                 false, ExpandStructures, FD);
4498    } else {
4499      S += '[';
4500
4501      if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) {
4502        if (getTypeSize(CAT->getElementType()) == 0)
4503          S += '0';
4504        else
4505          S += llvm::utostr(CAT->getSize().getZExtValue());
4506      } else {
4507        //Variable length arrays are encoded as a regular array with 0 elements.
4508        assert((isa<VariableArrayType>(AT) || isa<IncompleteArrayType>(AT)) &&
4509               "Unknown array type!");
4510        S += '0';
4511      }
4512
4513      getObjCEncodingForTypeImpl(AT->getElementType(), S,
4514                                 false, ExpandStructures, FD);
4515      S += ']';
4516    }
4517    return;
4518  }
4519
4520  if (T->getAs<FunctionType>()) {
4521    S += '?';
4522    return;
4523  }
4524
4525  if (const RecordType *RTy = T->getAs<RecordType>()) {
4526    RecordDecl *RDecl = RTy->getDecl();
4527    S += RDecl->isUnion() ? '(' : '{';
4528    // Anonymous structures print as '?'
4529    if (const IdentifierInfo *II = RDecl->getIdentifier()) {
4530      S += II->getName();
4531      if (ClassTemplateSpecializationDecl *Spec
4532          = dyn_cast<ClassTemplateSpecializationDecl>(RDecl)) {
4533        const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
4534        std::string TemplateArgsStr
4535          = TemplateSpecializationType::PrintTemplateArgumentList(
4536                                            TemplateArgs.data(),
4537                                            TemplateArgs.size(),
4538                                            (*this).getPrintingPolicy());
4539
4540        S += TemplateArgsStr;
4541      }
4542    } else {
4543      S += '?';
4544    }
4545    if (ExpandStructures) {
4546      S += '=';
4547      if (!RDecl->isUnion()) {
4548        getObjCEncodingForStructureImpl(RDecl, S, FD);
4549      } else {
4550        for (RecordDecl::field_iterator Field = RDecl->field_begin(),
4551                                     FieldEnd = RDecl->field_end();
4552             Field != FieldEnd; ++Field) {
4553          if (FD) {
4554            S += '"';
4555            S += Field->getNameAsString();
4556            S += '"';
4557          }
4558
4559          // Special case bit-fields.
4560          if (Field->isBitField()) {
4561            getObjCEncodingForTypeImpl(Field->getType(), S, false, true,
4562                                       (*Field));
4563          } else {
4564            QualType qt = Field->getType();
4565            getLegacyIntegralTypeEncoding(qt);
4566            getObjCEncodingForTypeImpl(qt, S, false, true,
4567                                       FD, /*OutermostType*/false,
4568                                       /*EncodingProperty*/false,
4569                                       /*StructField*/true);
4570          }
4571        }
4572      }
4573    }
4574    S += RDecl->isUnion() ? ')' : '}';
4575    return;
4576  }
4577
4578  if (const EnumType *ET = T->getAs<EnumType>()) {
4579    if (FD && FD->isBitField())
4580      EncodeBitField(this, S, T, FD);
4581    else
4582      S += ObjCEncodingForEnumType(this, ET);
4583    return;
4584  }
4585
4586  if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) {
4587    S += "@?"; // Unlike a pointer-to-function, which is "^?".
4588    if (EncodeBlockParameters) {
4589      const FunctionType *FT = BT->getPointeeType()->getAs<FunctionType>();
4590
4591      S += '<';
4592      // Block return type
4593      getObjCEncodingForTypeImpl(FT->getResultType(), S,
4594                                 ExpandPointedToStructures, ExpandStructures,
4595                                 FD,
4596                                 false /* OutermostType */,
4597                                 EncodingProperty,
4598                                 false /* StructField */,
4599                                 EncodeBlockParameters,
4600                                 EncodeClassNames);
4601      // Block self
4602      S += "@?";
4603      // Block parameters
4604      if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT)) {
4605        for (FunctionProtoType::arg_type_iterator I = FPT->arg_type_begin(),
4606               E = FPT->arg_type_end(); I && (I != E); ++I) {
4607          getObjCEncodingForTypeImpl(*I, S,
4608                                     ExpandPointedToStructures,
4609                                     ExpandStructures,
4610                                     FD,
4611                                     false /* OutermostType */,
4612                                     EncodingProperty,
4613                                     false /* StructField */,
4614                                     EncodeBlockParameters,
4615                                     EncodeClassNames);
4616        }
4617      }
4618      S += '>';
4619    }
4620    return;
4621  }
4622
4623  // Ignore protocol qualifiers when mangling at this level.
4624  if (const ObjCObjectType *OT = T->getAs<ObjCObjectType>())
4625    T = OT->getBaseType();
4626
4627  if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) {
4628    // @encode(class_name)
4629    ObjCInterfaceDecl *OI = OIT->getDecl();
4630    S += '{';
4631    const IdentifierInfo *II = OI->getIdentifier();
4632    S += II->getName();
4633    S += '=';
4634    SmallVector<const ObjCIvarDecl*, 32> Ivars;
4635    DeepCollectObjCIvars(OI, true, Ivars);
4636    for (unsigned i = 0, e = Ivars.size(); i != e; ++i) {
4637      const FieldDecl *Field = cast<FieldDecl>(Ivars[i]);
4638      if (Field->isBitField())
4639        getObjCEncodingForTypeImpl(Field->getType(), S, false, true, Field);
4640      else
4641        getObjCEncodingForTypeImpl(Field->getType(), S, false, true, FD);
4642    }
4643    S += '}';
4644    return;
4645  }
4646
4647  if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) {
4648    if (OPT->isObjCIdType()) {
4649      S += '@';
4650      return;
4651    }
4652
4653    if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) {
4654      // FIXME: Consider if we need to output qualifiers for 'Class<p>'.
4655      // Since this is a binary compatibility issue, need to consult with runtime
4656      // folks. Fortunately, this is a *very* obsure construct.
4657      S += '#';
4658      return;
4659    }
4660
4661    if (OPT->isObjCQualifiedIdType()) {
4662      getObjCEncodingForTypeImpl(getObjCIdType(), S,
4663                                 ExpandPointedToStructures,
4664                                 ExpandStructures, FD);
4665      if (FD || EncodingProperty || EncodeClassNames) {
4666        // Note that we do extended encoding of protocol qualifer list
4667        // Only when doing ivar or property encoding.
4668        S += '"';
4669        for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
4670             E = OPT->qual_end(); I != E; ++I) {
4671          S += '<';
4672          S += (*I)->getNameAsString();
4673          S += '>';
4674        }
4675        S += '"';
4676      }
4677      return;
4678    }
4679
4680    QualType PointeeTy = OPT->getPointeeType();
4681    if (!EncodingProperty &&
4682        isa<TypedefType>(PointeeTy.getTypePtr())) {
4683      // Another historical/compatibility reason.
4684      // We encode the underlying type which comes out as
4685      // {...};
4686      S += '^';
4687      getObjCEncodingForTypeImpl(PointeeTy, S,
4688                                 false, ExpandPointedToStructures,
4689                                 NULL);
4690      return;
4691    }
4692
4693    S += '@';
4694    if (OPT->getInterfaceDecl() &&
4695        (FD || EncodingProperty || EncodeClassNames)) {
4696      S += '"';
4697      S += OPT->getInterfaceDecl()->getIdentifier()->getName();
4698      for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
4699           E = OPT->qual_end(); I != E; ++I) {
4700        S += '<';
4701        S += (*I)->getNameAsString();
4702        S += '>';
4703      }
4704      S += '"';
4705    }
4706    return;
4707  }
4708
4709  // gcc just blithely ignores member pointers.
4710  // TODO: maybe there should be a mangling for these
4711  if (T->getAs<MemberPointerType>())
4712    return;
4713
4714  if (T->isVectorType()) {
4715    // This matches gcc's encoding, even though technically it is
4716    // insufficient.
4717    // FIXME. We should do a better job than gcc.
4718    return;
4719  }
4720
4721  llvm_unreachable("@encode for type not implemented!");
4722}
4723
4724void ASTContext::getObjCEncodingForStructureImpl(RecordDecl *RDecl,
4725                                                 std::string &S,
4726                                                 const FieldDecl *FD,
4727                                                 bool includeVBases) const {
4728  assert(RDecl && "Expected non-null RecordDecl");
4729  assert(!RDecl->isUnion() && "Should not be called for unions");
4730  if (!RDecl->getDefinition())
4731    return;
4732
4733  CXXRecordDecl *CXXRec = dyn_cast<CXXRecordDecl>(RDecl);
4734  std::multimap<uint64_t, NamedDecl *> FieldOrBaseOffsets;
4735  const ASTRecordLayout &layout = getASTRecordLayout(RDecl);
4736
4737  if (CXXRec) {
4738    for (CXXRecordDecl::base_class_iterator
4739           BI = CXXRec->bases_begin(),
4740           BE = CXXRec->bases_end(); BI != BE; ++BI) {
4741      if (!BI->isVirtual()) {
4742        CXXRecordDecl *base = BI->getType()->getAsCXXRecordDecl();
4743        if (base->isEmpty())
4744          continue;
4745        uint64_t offs = layout.getBaseClassOffsetInBits(base);
4746        FieldOrBaseOffsets.insert(FieldOrBaseOffsets.upper_bound(offs),
4747                                  std::make_pair(offs, base));
4748      }
4749    }
4750  }
4751
4752  unsigned i = 0;
4753  for (RecordDecl::field_iterator Field = RDecl->field_begin(),
4754                               FieldEnd = RDecl->field_end();
4755       Field != FieldEnd; ++Field, ++i) {
4756    uint64_t offs = layout.getFieldOffset(i);
4757    FieldOrBaseOffsets.insert(FieldOrBaseOffsets.upper_bound(offs),
4758                              std::make_pair(offs, *Field));
4759  }
4760
4761  if (CXXRec && includeVBases) {
4762    for (CXXRecordDecl::base_class_iterator
4763           BI = CXXRec->vbases_begin(),
4764           BE = CXXRec->vbases_end(); BI != BE; ++BI) {
4765      CXXRecordDecl *base = BI->getType()->getAsCXXRecordDecl();
4766      if (base->isEmpty())
4767        continue;
4768      uint64_t offs = layout.getVBaseClassOffsetInBits(base);
4769      if (FieldOrBaseOffsets.find(offs) == FieldOrBaseOffsets.end())
4770        FieldOrBaseOffsets.insert(FieldOrBaseOffsets.end(),
4771                                  std::make_pair(offs, base));
4772    }
4773  }
4774
4775  CharUnits size;
4776  if (CXXRec) {
4777    size = includeVBases ? layout.getSize() : layout.getNonVirtualSize();
4778  } else {
4779    size = layout.getSize();
4780  }
4781
4782  uint64_t CurOffs = 0;
4783  std::multimap<uint64_t, NamedDecl *>::iterator
4784    CurLayObj = FieldOrBaseOffsets.begin();
4785
4786  if ((CurLayObj != FieldOrBaseOffsets.end() && CurLayObj->first != 0) ||
4787      (CurLayObj == FieldOrBaseOffsets.end() &&
4788         CXXRec && CXXRec->isDynamicClass())) {
4789    assert(CXXRec && CXXRec->isDynamicClass() &&
4790           "Offset 0 was empty but no VTable ?");
4791    if (FD) {
4792      S += "\"_vptr$";
4793      std::string recname = CXXRec->getNameAsString();
4794      if (recname.empty()) recname = "?";
4795      S += recname;
4796      S += '"';
4797    }
4798    S += "^^?";
4799    CurOffs += getTypeSize(VoidPtrTy);
4800  }
4801
4802  if (!RDecl->hasFlexibleArrayMember()) {
4803    // Mark the end of the structure.
4804    uint64_t offs = toBits(size);
4805    FieldOrBaseOffsets.insert(FieldOrBaseOffsets.upper_bound(offs),
4806                              std::make_pair(offs, (NamedDecl*)0));
4807  }
4808
4809  for (; CurLayObj != FieldOrBaseOffsets.end(); ++CurLayObj) {
4810    assert(CurOffs <= CurLayObj->first);
4811
4812    if (CurOffs < CurLayObj->first) {
4813      uint64_t padding = CurLayObj->first - CurOffs;
4814      // FIXME: There doesn't seem to be a way to indicate in the encoding that
4815      // packing/alignment of members is different that normal, in which case
4816      // the encoding will be out-of-sync with the real layout.
4817      // If the runtime switches to just consider the size of types without
4818      // taking into account alignment, we could make padding explicit in the
4819      // encoding (e.g. using arrays of chars). The encoding strings would be
4820      // longer then though.
4821      CurOffs += padding;
4822    }
4823
4824    NamedDecl *dcl = CurLayObj->second;
4825    if (dcl == 0)
4826      break; // reached end of structure.
4827
4828    if (CXXRecordDecl *base = dyn_cast<CXXRecordDecl>(dcl)) {
4829      // We expand the bases without their virtual bases since those are going
4830      // in the initial structure. Note that this differs from gcc which
4831      // expands virtual bases each time one is encountered in the hierarchy,
4832      // making the encoding type bigger than it really is.
4833      getObjCEncodingForStructureImpl(base, S, FD, /*includeVBases*/false);
4834      assert(!base->isEmpty());
4835      CurOffs += toBits(getASTRecordLayout(base).getNonVirtualSize());
4836    } else {
4837      FieldDecl *field = cast<FieldDecl>(dcl);
4838      if (FD) {
4839        S += '"';
4840        S += field->getNameAsString();
4841        S += '"';
4842      }
4843
4844      if (field->isBitField()) {
4845        EncodeBitField(this, S, field->getType(), field);
4846        CurOffs += field->getBitWidthValue(*this);
4847      } else {
4848        QualType qt = field->getType();
4849        getLegacyIntegralTypeEncoding(qt);
4850        getObjCEncodingForTypeImpl(qt, S, false, true, FD,
4851                                   /*OutermostType*/false,
4852                                   /*EncodingProperty*/false,
4853                                   /*StructField*/true);
4854        CurOffs += getTypeSize(field->getType());
4855      }
4856    }
4857  }
4858}
4859
4860void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT,
4861                                                 std::string& S) const {
4862  if (QT & Decl::OBJC_TQ_In)
4863    S += 'n';
4864  if (QT & Decl::OBJC_TQ_Inout)
4865    S += 'N';
4866  if (QT & Decl::OBJC_TQ_Out)
4867    S += 'o';
4868  if (QT & Decl::OBJC_TQ_Bycopy)
4869    S += 'O';
4870  if (QT & Decl::OBJC_TQ_Byref)
4871    S += 'R';
4872  if (QT & Decl::OBJC_TQ_Oneway)
4873    S += 'V';
4874}
4875
4876void ASTContext::setBuiltinVaListType(QualType T) {
4877  assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!");
4878
4879  BuiltinVaListType = T;
4880}
4881
4882TypedefDecl *ASTContext::getObjCIdDecl() const {
4883  if (!ObjCIdDecl) {
4884    QualType T = getObjCObjectType(ObjCBuiltinIdTy, 0, 0);
4885    T = getObjCObjectPointerType(T);
4886    TypeSourceInfo *IdInfo = getTrivialTypeSourceInfo(T);
4887    ObjCIdDecl = TypedefDecl::Create(const_cast<ASTContext &>(*this),
4888                                     getTranslationUnitDecl(),
4889                                     SourceLocation(), SourceLocation(),
4890                                     &Idents.get("id"), IdInfo);
4891  }
4892
4893  return ObjCIdDecl;
4894}
4895
4896TypedefDecl *ASTContext::getObjCSelDecl() const {
4897  if (!ObjCSelDecl) {
4898    QualType SelT = getPointerType(ObjCBuiltinSelTy);
4899    TypeSourceInfo *SelInfo = getTrivialTypeSourceInfo(SelT);
4900    ObjCSelDecl = TypedefDecl::Create(const_cast<ASTContext &>(*this),
4901                                      getTranslationUnitDecl(),
4902                                      SourceLocation(), SourceLocation(),
4903                                      &Idents.get("SEL"), SelInfo);
4904  }
4905  return ObjCSelDecl;
4906}
4907
4908TypedefDecl *ASTContext::getObjCClassDecl() const {
4909  if (!ObjCClassDecl) {
4910    QualType T = getObjCObjectType(ObjCBuiltinClassTy, 0, 0);
4911    T = getObjCObjectPointerType(T);
4912    TypeSourceInfo *ClassInfo = getTrivialTypeSourceInfo(T);
4913    ObjCClassDecl = TypedefDecl::Create(const_cast<ASTContext &>(*this),
4914                                        getTranslationUnitDecl(),
4915                                        SourceLocation(), SourceLocation(),
4916                                        &Idents.get("Class"), ClassInfo);
4917  }
4918
4919  return ObjCClassDecl;
4920}
4921
4922ObjCInterfaceDecl *ASTContext::getObjCProtocolDecl() const {
4923  if (!ObjCProtocolClassDecl) {
4924    ObjCProtocolClassDecl
4925      = ObjCInterfaceDecl::Create(*this, getTranslationUnitDecl(),
4926                                  SourceLocation(),
4927                                  &Idents.get("Protocol"),
4928                                  /*PrevDecl=*/0,
4929                                  SourceLocation(), true);
4930  }
4931
4932  return ObjCProtocolClassDecl;
4933}
4934
4935void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) {
4936  assert(ObjCConstantStringType.isNull() &&
4937         "'NSConstantString' type already set!");
4938
4939  ObjCConstantStringType = getObjCInterfaceType(Decl);
4940}
4941
4942/// \brief Retrieve the template name that corresponds to a non-empty
4943/// lookup.
4944TemplateName
4945ASTContext::getOverloadedTemplateName(UnresolvedSetIterator Begin,
4946                                      UnresolvedSetIterator End) const {
4947  unsigned size = End - Begin;
4948  assert(size > 1 && "set is not overloaded!");
4949
4950  void *memory = Allocate(sizeof(OverloadedTemplateStorage) +
4951                          size * sizeof(FunctionTemplateDecl*));
4952  OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size);
4953
4954  NamedDecl **Storage = OT->getStorage();
4955  for (UnresolvedSetIterator I = Begin; I != End; ++I) {
4956    NamedDecl *D = *I;
4957    assert(isa<FunctionTemplateDecl>(D) ||
4958           (isa<UsingShadowDecl>(D) &&
4959            isa<FunctionTemplateDecl>(D->getUnderlyingDecl())));
4960    *Storage++ = D;
4961  }
4962
4963  return TemplateName(OT);
4964}
4965
4966/// \brief Retrieve the template name that represents a qualified
4967/// template name such as \c std::vector.
4968TemplateName
4969ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS,
4970                                     bool TemplateKeyword,
4971                                     TemplateDecl *Template) const {
4972  assert(NNS && "Missing nested-name-specifier in qualified template name");
4973
4974  // FIXME: Canonicalization?
4975  llvm::FoldingSetNodeID ID;
4976  QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template);
4977
4978  void *InsertPos = 0;
4979  QualifiedTemplateName *QTN =
4980    QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos);
4981  if (!QTN) {
4982    QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template);
4983    QualifiedTemplateNames.InsertNode(QTN, InsertPos);
4984  }
4985
4986  return TemplateName(QTN);
4987}
4988
4989/// \brief Retrieve the template name that represents a dependent
4990/// template name such as \c MetaFun::template apply.
4991TemplateName
4992ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS,
4993                                     const IdentifierInfo *Name) const {
4994  assert((!NNS || NNS->isDependent()) &&
4995         "Nested name specifier must be dependent");
4996
4997  llvm::FoldingSetNodeID ID;
4998  DependentTemplateName::Profile(ID, NNS, Name);
4999
5000  void *InsertPos = 0;
5001  DependentTemplateName *QTN =
5002    DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos);
5003
5004  if (QTN)
5005    return TemplateName(QTN);
5006
5007  NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS);
5008  if (CanonNNS == NNS) {
5009    QTN = new (*this,4) DependentTemplateName(NNS, Name);
5010  } else {
5011    TemplateName Canon = getDependentTemplateName(CanonNNS, Name);
5012    QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon);
5013    DependentTemplateName *CheckQTN =
5014      DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos);
5015    assert(!CheckQTN && "Dependent type name canonicalization broken");
5016    (void)CheckQTN;
5017  }
5018
5019  DependentTemplateNames.InsertNode(QTN, InsertPos);
5020  return TemplateName(QTN);
5021}
5022
5023/// \brief Retrieve the template name that represents a dependent
5024/// template name such as \c MetaFun::template operator+.
5025TemplateName
5026ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS,
5027                                     OverloadedOperatorKind Operator) const {
5028  assert((!NNS || NNS->isDependent()) &&
5029         "Nested name specifier must be dependent");
5030
5031  llvm::FoldingSetNodeID ID;
5032  DependentTemplateName::Profile(ID, NNS, Operator);
5033
5034  void *InsertPos = 0;
5035  DependentTemplateName *QTN
5036    = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos);
5037
5038  if (QTN)
5039    return TemplateName(QTN);
5040
5041  NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS);
5042  if (CanonNNS == NNS) {
5043    QTN = new (*this,4) DependentTemplateName(NNS, Operator);
5044  } else {
5045    TemplateName Canon = getDependentTemplateName(CanonNNS, Operator);
5046    QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon);
5047
5048    DependentTemplateName *CheckQTN
5049      = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos);
5050    assert(!CheckQTN && "Dependent template name canonicalization broken");
5051    (void)CheckQTN;
5052  }
5053
5054  DependentTemplateNames.InsertNode(QTN, InsertPos);
5055  return TemplateName(QTN);
5056}
5057
5058TemplateName
5059ASTContext::getSubstTemplateTemplateParm(TemplateTemplateParmDecl *param,
5060                                         TemplateName replacement) const {
5061  llvm::FoldingSetNodeID ID;
5062  SubstTemplateTemplateParmStorage::Profile(ID, param, replacement);
5063
5064  void *insertPos = 0;
5065  SubstTemplateTemplateParmStorage *subst
5066    = SubstTemplateTemplateParms.FindNodeOrInsertPos(ID, insertPos);
5067
5068  if (!subst) {
5069    subst = new (*this) SubstTemplateTemplateParmStorage(param, replacement);
5070    SubstTemplateTemplateParms.InsertNode(subst, insertPos);
5071  }
5072
5073  return TemplateName(subst);
5074}
5075
5076TemplateName
5077ASTContext::getSubstTemplateTemplateParmPack(TemplateTemplateParmDecl *Param,
5078                                       const TemplateArgument &ArgPack) const {
5079  ASTContext &Self = const_cast<ASTContext &>(*this);
5080  llvm::FoldingSetNodeID ID;
5081  SubstTemplateTemplateParmPackStorage::Profile(ID, Self, Param, ArgPack);
5082
5083  void *InsertPos = 0;
5084  SubstTemplateTemplateParmPackStorage *Subst
5085    = SubstTemplateTemplateParmPacks.FindNodeOrInsertPos(ID, InsertPos);
5086
5087  if (!Subst) {
5088    Subst = new (*this) SubstTemplateTemplateParmPackStorage(Param,
5089                                                           ArgPack.pack_size(),
5090                                                         ArgPack.pack_begin());
5091    SubstTemplateTemplateParmPacks.InsertNode(Subst, InsertPos);
5092  }
5093
5094  return TemplateName(Subst);
5095}
5096
5097/// getFromTargetType - Given one of the integer types provided by
5098/// TargetInfo, produce the corresponding type. The unsigned @p Type
5099/// is actually a value of type @c TargetInfo::IntType.
5100CanQualType ASTContext::getFromTargetType(unsigned Type) const {
5101  switch (Type) {
5102  case TargetInfo::NoInt: return CanQualType();
5103  case TargetInfo::SignedShort: return ShortTy;
5104  case TargetInfo::UnsignedShort: return UnsignedShortTy;
5105  case TargetInfo::SignedInt: return IntTy;
5106  case TargetInfo::UnsignedInt: return UnsignedIntTy;
5107  case TargetInfo::SignedLong: return LongTy;
5108  case TargetInfo::UnsignedLong: return UnsignedLongTy;
5109  case TargetInfo::SignedLongLong: return LongLongTy;
5110  case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy;
5111  }
5112
5113  llvm_unreachable("Unhandled TargetInfo::IntType value");
5114}
5115
5116//===----------------------------------------------------------------------===//
5117//                        Type Predicates.
5118//===----------------------------------------------------------------------===//
5119
5120/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's
5121/// garbage collection attribute.
5122///
5123Qualifiers::GC ASTContext::getObjCGCAttrKind(QualType Ty) const {
5124  if (getLangOptions().getGC() == LangOptions::NonGC)
5125    return Qualifiers::GCNone;
5126
5127  assert(getLangOptions().ObjC1);
5128  Qualifiers::GC GCAttrs = Ty.getObjCGCAttr();
5129
5130  // Default behaviour under objective-C's gc is for ObjC pointers
5131  // (or pointers to them) be treated as though they were declared
5132  // as __strong.
5133  if (GCAttrs == Qualifiers::GCNone) {
5134    if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType())
5135      return Qualifiers::Strong;
5136    else if (Ty->isPointerType())
5137      return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType());
5138  } else {
5139    // It's not valid to set GC attributes on anything that isn't a
5140    // pointer.
5141#ifndef NDEBUG
5142    QualType CT = Ty->getCanonicalTypeInternal();
5143    while (const ArrayType *AT = dyn_cast<ArrayType>(CT))
5144      CT = AT->getElementType();
5145    assert(CT->isAnyPointerType() || CT->isBlockPointerType());
5146#endif
5147  }
5148  return GCAttrs;
5149}
5150
5151//===----------------------------------------------------------------------===//
5152//                        Type Compatibility Testing
5153//===----------------------------------------------------------------------===//
5154
5155/// areCompatVectorTypes - Return true if the two specified vector types are
5156/// compatible.
5157static bool areCompatVectorTypes(const VectorType *LHS,
5158                                 const VectorType *RHS) {
5159  assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified());
5160  return LHS->getElementType() == RHS->getElementType() &&
5161         LHS->getNumElements() == RHS->getNumElements();
5162}
5163
5164bool ASTContext::areCompatibleVectorTypes(QualType FirstVec,
5165                                          QualType SecondVec) {
5166  assert(FirstVec->isVectorType() && "FirstVec should be a vector type");
5167  assert(SecondVec->isVectorType() && "SecondVec should be a vector type");
5168
5169  if (hasSameUnqualifiedType(FirstVec, SecondVec))
5170    return true;
5171
5172  // Treat Neon vector types and most AltiVec vector types as if they are the
5173  // equivalent GCC vector types.
5174  const VectorType *First = FirstVec->getAs<VectorType>();
5175  const VectorType *Second = SecondVec->getAs<VectorType>();
5176  if (First->getNumElements() == Second->getNumElements() &&
5177      hasSameType(First->getElementType(), Second->getElementType()) &&
5178      First->getVectorKind() != VectorType::AltiVecPixel &&
5179      First->getVectorKind() != VectorType::AltiVecBool &&
5180      Second->getVectorKind() != VectorType::AltiVecPixel &&
5181      Second->getVectorKind() != VectorType::AltiVecBool)
5182    return true;
5183
5184  return false;
5185}
5186
5187//===----------------------------------------------------------------------===//
5188// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's.
5189//===----------------------------------------------------------------------===//
5190
5191/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the
5192/// inheritance hierarchy of 'rProto'.
5193bool
5194ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto,
5195                                           ObjCProtocolDecl *rProto) const {
5196  if (declaresSameEntity(lProto, rProto))
5197    return true;
5198  for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(),
5199       E = rProto->protocol_end(); PI != E; ++PI)
5200    if (ProtocolCompatibleWithProtocol(lProto, *PI))
5201      return true;
5202  return false;
5203}
5204
5205/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...>
5206/// return true if lhs's protocols conform to rhs's protocol; false
5207/// otherwise.
5208bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) {
5209  if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType())
5210    return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false);
5211  return false;
5212}
5213
5214/// ObjCQualifiedClassTypesAreCompatible - compare  Class<p,...> and
5215/// Class<p1, ...>.
5216bool ASTContext::ObjCQualifiedClassTypesAreCompatible(QualType lhs,
5217                                                      QualType rhs) {
5218  const ObjCObjectPointerType *lhsQID = lhs->getAs<ObjCObjectPointerType>();
5219  const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>();
5220  assert ((lhsQID && rhsOPT) && "ObjCQualifiedClassTypesAreCompatible");
5221
5222  for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(),
5223       E = lhsQID->qual_end(); I != E; ++I) {
5224    bool match = false;
5225    ObjCProtocolDecl *lhsProto = *I;
5226    for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(),
5227         E = rhsOPT->qual_end(); J != E; ++J) {
5228      ObjCProtocolDecl *rhsProto = *J;
5229      if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto)) {
5230        match = true;
5231        break;
5232      }
5233    }
5234    if (!match)
5235      return false;
5236  }
5237  return true;
5238}
5239
5240/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an
5241/// ObjCQualifiedIDType.
5242bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs,
5243                                                   bool compare) {
5244  // Allow id<P..> and an 'id' or void* type in all cases.
5245  if (lhs->isVoidPointerType() ||
5246      lhs->isObjCIdType() || lhs->isObjCClassType())
5247    return true;
5248  else if (rhs->isVoidPointerType() ||
5249           rhs->isObjCIdType() || rhs->isObjCClassType())
5250    return true;
5251
5252  if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) {
5253    const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>();
5254
5255    if (!rhsOPT) return false;
5256
5257    if (rhsOPT->qual_empty()) {
5258      // If the RHS is a unqualified interface pointer "NSString*",
5259      // make sure we check the class hierarchy.
5260      if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) {
5261        for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(),
5262             E = lhsQID->qual_end(); I != E; ++I) {
5263          // when comparing an id<P> on lhs with a static type on rhs,
5264          // see if static class implements all of id's protocols, directly or
5265          // through its super class and categories.
5266          if (!rhsID->ClassImplementsProtocol(*I, true))
5267            return false;
5268        }
5269      }
5270      // If there are no qualifiers and no interface, we have an 'id'.
5271      return true;
5272    }
5273    // Both the right and left sides have qualifiers.
5274    for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(),
5275         E = lhsQID->qual_end(); I != E; ++I) {
5276      ObjCProtocolDecl *lhsProto = *I;
5277      bool match = false;
5278
5279      // when comparing an id<P> on lhs with a static type on rhs,
5280      // see if static class implements all of id's protocols, directly or
5281      // through its super class and categories.
5282      for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(),
5283           E = rhsOPT->qual_end(); J != E; ++J) {
5284        ObjCProtocolDecl *rhsProto = *J;
5285        if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) ||
5286            (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) {
5287          match = true;
5288          break;
5289        }
5290      }
5291      // If the RHS is a qualified interface pointer "NSString<P>*",
5292      // make sure we check the class hierarchy.
5293      if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) {
5294        for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(),
5295             E = lhsQID->qual_end(); I != E; ++I) {
5296          // when comparing an id<P> on lhs with a static type on rhs,
5297          // see if static class implements all of id's protocols, directly or
5298          // through its super class and categories.
5299          if (rhsID->ClassImplementsProtocol(*I, true)) {
5300            match = true;
5301            break;
5302          }
5303        }
5304      }
5305      if (!match)
5306        return false;
5307    }
5308
5309    return true;
5310  }
5311
5312  const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType();
5313  assert(rhsQID && "One of the LHS/RHS should be id<x>");
5314
5315  if (const ObjCObjectPointerType *lhsOPT =
5316        lhs->getAsObjCInterfacePointerType()) {
5317    // If both the right and left sides have qualifiers.
5318    for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(),
5319         E = lhsOPT->qual_end(); I != E; ++I) {
5320      ObjCProtocolDecl *lhsProto = *I;
5321      bool match = false;
5322
5323      // when comparing an id<P> on rhs with a static type on lhs,
5324      // see if static class implements all of id's protocols, directly or
5325      // through its super class and categories.
5326      // First, lhs protocols in the qualifier list must be found, direct
5327      // or indirect in rhs's qualifier list or it is a mismatch.
5328      for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(),
5329           E = rhsQID->qual_end(); J != E; ++J) {
5330        ObjCProtocolDecl *rhsProto = *J;
5331        if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) ||
5332            (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) {
5333          match = true;
5334          break;
5335        }
5336      }
5337      if (!match)
5338        return false;
5339    }
5340
5341    // Static class's protocols, or its super class or category protocols
5342    // must be found, direct or indirect in rhs's qualifier list or it is a mismatch.
5343    if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) {
5344      llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols;
5345      CollectInheritedProtocols(lhsID, LHSInheritedProtocols);
5346      // This is rather dubious but matches gcc's behavior. If lhs has
5347      // no type qualifier and its class has no static protocol(s)
5348      // assume that it is mismatch.
5349      if (LHSInheritedProtocols.empty() && lhsOPT->qual_empty())
5350        return false;
5351      for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I =
5352           LHSInheritedProtocols.begin(),
5353           E = LHSInheritedProtocols.end(); I != E; ++I) {
5354        bool match = false;
5355        ObjCProtocolDecl *lhsProto = (*I);
5356        for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(),
5357             E = rhsQID->qual_end(); J != E; ++J) {
5358          ObjCProtocolDecl *rhsProto = *J;
5359          if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) ||
5360              (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) {
5361            match = true;
5362            break;
5363          }
5364        }
5365        if (!match)
5366          return false;
5367      }
5368    }
5369    return true;
5370  }
5371  return false;
5372}
5373
5374/// canAssignObjCInterfaces - Return true if the two interface types are
5375/// compatible for assignment from RHS to LHS.  This handles validation of any
5376/// protocol qualifiers on the LHS or RHS.
5377///
5378bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT,
5379                                         const ObjCObjectPointerType *RHSOPT) {
5380  const ObjCObjectType* LHS = LHSOPT->getObjectType();
5381  const ObjCObjectType* RHS = RHSOPT->getObjectType();
5382
5383  // If either type represents the built-in 'id' or 'Class' types, return true.
5384  if (LHS->isObjCUnqualifiedIdOrClass() ||
5385      RHS->isObjCUnqualifiedIdOrClass())
5386    return true;
5387
5388  if (LHS->isObjCQualifiedId() || RHS->isObjCQualifiedId())
5389    return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0),
5390                                             QualType(RHSOPT,0),
5391                                             false);
5392
5393  if (LHS->isObjCQualifiedClass() && RHS->isObjCQualifiedClass())
5394    return ObjCQualifiedClassTypesAreCompatible(QualType(LHSOPT,0),
5395                                                QualType(RHSOPT,0));
5396
5397  // If we have 2 user-defined types, fall into that path.
5398  if (LHS->getInterface() && RHS->getInterface())
5399    return canAssignObjCInterfaces(LHS, RHS);
5400
5401  return false;
5402}
5403
5404/// canAssignObjCInterfacesInBlockPointer - This routine is specifically written
5405/// for providing type-safety for objective-c pointers used to pass/return
5406/// arguments in block literals. When passed as arguments, passing 'A*' where
5407/// 'id' is expected is not OK. Passing 'Sub *" where 'Super *" is expected is
5408/// not OK. For the return type, the opposite is not OK.
5409bool ASTContext::canAssignObjCInterfacesInBlockPointer(
5410                                         const ObjCObjectPointerType *LHSOPT,
5411                                         const ObjCObjectPointerType *RHSOPT,
5412                                         bool BlockReturnType) {
5413  if (RHSOPT->isObjCBuiltinType() || LHSOPT->isObjCIdType())
5414    return true;
5415
5416  if (LHSOPT->isObjCBuiltinType()) {
5417    return RHSOPT->isObjCBuiltinType() || RHSOPT->isObjCQualifiedIdType();
5418  }
5419
5420  if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType())
5421    return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0),
5422                                             QualType(RHSOPT,0),
5423                                             false);
5424
5425  const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType();
5426  const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType();
5427  if (LHS && RHS)  { // We have 2 user-defined types.
5428    if (LHS != RHS) {
5429      if (LHS->getDecl()->isSuperClassOf(RHS->getDecl()))
5430        return BlockReturnType;
5431      if (RHS->getDecl()->isSuperClassOf(LHS->getDecl()))
5432        return !BlockReturnType;
5433    }
5434    else
5435      return true;
5436  }
5437  return false;
5438}
5439
5440/// getIntersectionOfProtocols - This routine finds the intersection of set
5441/// of protocols inherited from two distinct objective-c pointer objects.
5442/// It is used to build composite qualifier list of the composite type of
5443/// the conditional expression involving two objective-c pointer objects.
5444static
5445void getIntersectionOfProtocols(ASTContext &Context,
5446                                const ObjCObjectPointerType *LHSOPT,
5447                                const ObjCObjectPointerType *RHSOPT,
5448      SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) {
5449
5450  const ObjCObjectType* LHS = LHSOPT->getObjectType();
5451  const ObjCObjectType* RHS = RHSOPT->getObjectType();
5452  assert(LHS->getInterface() && "LHS must have an interface base");
5453  assert(RHS->getInterface() && "RHS must have an interface base");
5454
5455  llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet;
5456  unsigned LHSNumProtocols = LHS->getNumProtocols();
5457  if (LHSNumProtocols > 0)
5458    InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end());
5459  else {
5460    llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols;
5461    Context.CollectInheritedProtocols(LHS->getInterface(),
5462                                      LHSInheritedProtocols);
5463    InheritedProtocolSet.insert(LHSInheritedProtocols.begin(),
5464                                LHSInheritedProtocols.end());
5465  }
5466
5467  unsigned RHSNumProtocols = RHS->getNumProtocols();
5468  if (RHSNumProtocols > 0) {
5469    ObjCProtocolDecl **RHSProtocols =
5470      const_cast<ObjCProtocolDecl **>(RHS->qual_begin());
5471    for (unsigned i = 0; i < RHSNumProtocols; ++i)
5472      if (InheritedProtocolSet.count(RHSProtocols[i]))
5473        IntersectionOfProtocols.push_back(RHSProtocols[i]);
5474  } else {
5475    llvm::SmallPtrSet<ObjCProtocolDecl *, 8> RHSInheritedProtocols;
5476    Context.CollectInheritedProtocols(RHS->getInterface(),
5477                                      RHSInheritedProtocols);
5478    for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I =
5479         RHSInheritedProtocols.begin(),
5480         E = RHSInheritedProtocols.end(); I != E; ++I)
5481      if (InheritedProtocolSet.count((*I)))
5482        IntersectionOfProtocols.push_back((*I));
5483  }
5484}
5485
5486/// areCommonBaseCompatible - Returns common base class of the two classes if
5487/// one found. Note that this is O'2 algorithm. But it will be called as the
5488/// last type comparison in a ?-exp of ObjC pointer types before a
5489/// warning is issued. So, its invokation is extremely rare.
5490QualType ASTContext::areCommonBaseCompatible(
5491                                          const ObjCObjectPointerType *Lptr,
5492                                          const ObjCObjectPointerType *Rptr) {
5493  const ObjCObjectType *LHS = Lptr->getObjectType();
5494  const ObjCObjectType *RHS = Rptr->getObjectType();
5495  const ObjCInterfaceDecl* LDecl = LHS->getInterface();
5496  const ObjCInterfaceDecl* RDecl = RHS->getInterface();
5497  if (!LDecl || !RDecl || (declaresSameEntity(LDecl, RDecl)))
5498    return QualType();
5499
5500  do {
5501    LHS = cast<ObjCInterfaceType>(getObjCInterfaceType(LDecl));
5502    if (canAssignObjCInterfaces(LHS, RHS)) {
5503      SmallVector<ObjCProtocolDecl *, 8> Protocols;
5504      getIntersectionOfProtocols(*this, Lptr, Rptr, Protocols);
5505
5506      QualType Result = QualType(LHS, 0);
5507      if (!Protocols.empty())
5508        Result = getObjCObjectType(Result, Protocols.data(), Protocols.size());
5509      Result = getObjCObjectPointerType(Result);
5510      return Result;
5511    }
5512  } while ((LDecl = LDecl->getSuperClass()));
5513
5514  return QualType();
5515}
5516
5517bool ASTContext::canAssignObjCInterfaces(const ObjCObjectType *LHS,
5518                                         const ObjCObjectType *RHS) {
5519  assert(LHS->getInterface() && "LHS is not an interface type");
5520  assert(RHS->getInterface() && "RHS is not an interface type");
5521
5522  // Verify that the base decls are compatible: the RHS must be a subclass of
5523  // the LHS.
5524  if (!LHS->getInterface()->isSuperClassOf(RHS->getInterface()))
5525    return false;
5526
5527  // RHS must have a superset of the protocols in the LHS.  If the LHS is not
5528  // protocol qualified at all, then we are good.
5529  if (LHS->getNumProtocols() == 0)
5530    return true;
5531
5532  // Okay, we know the LHS has protocol qualifiers.  If the RHS doesn't,
5533  // more detailed analysis is required.
5534  if (RHS->getNumProtocols() == 0) {
5535    // OK, if LHS is a superclass of RHS *and*
5536    // this superclass is assignment compatible with LHS.
5537    // false otherwise.
5538    bool IsSuperClass =
5539      LHS->getInterface()->isSuperClassOf(RHS->getInterface());
5540    if (IsSuperClass) {
5541      // OK if conversion of LHS to SuperClass results in narrowing of types
5542      // ; i.e., SuperClass may implement at least one of the protocols
5543      // in LHS's protocol list. Example, SuperObj<P1> = lhs<P1,P2> is ok.
5544      // But not SuperObj<P1,P2,P3> = lhs<P1,P2>.
5545      llvm::SmallPtrSet<ObjCProtocolDecl *, 8> SuperClassInheritedProtocols;
5546      CollectInheritedProtocols(RHS->getInterface(), SuperClassInheritedProtocols);
5547      // If super class has no protocols, it is not a match.
5548      if (SuperClassInheritedProtocols.empty())
5549        return false;
5550
5551      for (ObjCObjectType::qual_iterator LHSPI = LHS->qual_begin(),
5552           LHSPE = LHS->qual_end();
5553           LHSPI != LHSPE; LHSPI++) {
5554        bool SuperImplementsProtocol = false;
5555        ObjCProtocolDecl *LHSProto = (*LHSPI);
5556
5557        for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I =
5558             SuperClassInheritedProtocols.begin(),
5559             E = SuperClassInheritedProtocols.end(); I != E; ++I) {
5560          ObjCProtocolDecl *SuperClassProto = (*I);
5561          if (SuperClassProto->lookupProtocolNamed(LHSProto->getIdentifier())) {
5562            SuperImplementsProtocol = true;
5563            break;
5564          }
5565        }
5566        if (!SuperImplementsProtocol)
5567          return false;
5568      }
5569      return true;
5570    }
5571    return false;
5572  }
5573
5574  for (ObjCObjectType::qual_iterator LHSPI = LHS->qual_begin(),
5575                                     LHSPE = LHS->qual_end();
5576       LHSPI != LHSPE; LHSPI++) {
5577    bool RHSImplementsProtocol = false;
5578
5579    // If the RHS doesn't implement the protocol on the left, the types
5580    // are incompatible.
5581    for (ObjCObjectType::qual_iterator RHSPI = RHS->qual_begin(),
5582                                       RHSPE = RHS->qual_end();
5583         RHSPI != RHSPE; RHSPI++) {
5584      if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) {
5585        RHSImplementsProtocol = true;
5586        break;
5587      }
5588    }
5589    // FIXME: For better diagnostics, consider passing back the protocol name.
5590    if (!RHSImplementsProtocol)
5591      return false;
5592  }
5593  // The RHS implements all protocols listed on the LHS.
5594  return true;
5595}
5596
5597bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) {
5598  // get the "pointed to" types
5599  const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>();
5600  const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>();
5601
5602  if (!LHSOPT || !RHSOPT)
5603    return false;
5604
5605  return canAssignObjCInterfaces(LHSOPT, RHSOPT) ||
5606         canAssignObjCInterfaces(RHSOPT, LHSOPT);
5607}
5608
5609bool ASTContext::canBindObjCObjectType(QualType To, QualType From) {
5610  return canAssignObjCInterfaces(
5611                getObjCObjectPointerType(To)->getAs<ObjCObjectPointerType>(),
5612                getObjCObjectPointerType(From)->getAs<ObjCObjectPointerType>());
5613}
5614
5615/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible,
5616/// both shall have the identically qualified version of a compatible type.
5617/// C99 6.2.7p1: Two types have compatible types if their types are the
5618/// same. See 6.7.[2,3,5] for additional rules.
5619bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS,
5620                                    bool CompareUnqualified) {
5621  if (getLangOptions().CPlusPlus)
5622    return hasSameType(LHS, RHS);
5623
5624  return !mergeTypes(LHS, RHS, false, CompareUnqualified).isNull();
5625}
5626
5627bool ASTContext::propertyTypesAreCompatible(QualType LHS, QualType RHS) {
5628  return typesAreCompatible(LHS, RHS);
5629}
5630
5631bool ASTContext::typesAreBlockPointerCompatible(QualType LHS, QualType RHS) {
5632  return !mergeTypes(LHS, RHS, true).isNull();
5633}
5634
5635/// mergeTransparentUnionType - if T is a transparent union type and a member
5636/// of T is compatible with SubType, return the merged type, else return
5637/// QualType()
5638QualType ASTContext::mergeTransparentUnionType(QualType T, QualType SubType,
5639                                               bool OfBlockPointer,
5640                                               bool Unqualified) {
5641  if (const RecordType *UT = T->getAsUnionType()) {
5642    RecordDecl *UD = UT->getDecl();
5643    if (UD->hasAttr<TransparentUnionAttr>()) {
5644      for (RecordDecl::field_iterator it = UD->field_begin(),
5645           itend = UD->field_end(); it != itend; ++it) {
5646        QualType ET = it->getType().getUnqualifiedType();
5647        QualType MT = mergeTypes(ET, SubType, OfBlockPointer, Unqualified);
5648        if (!MT.isNull())
5649          return MT;
5650      }
5651    }
5652  }
5653
5654  return QualType();
5655}
5656
5657/// mergeFunctionArgumentTypes - merge two types which appear as function
5658/// argument types
5659QualType ASTContext::mergeFunctionArgumentTypes(QualType lhs, QualType rhs,
5660                                                bool OfBlockPointer,
5661                                                bool Unqualified) {
5662  // GNU extension: two types are compatible if they appear as a function
5663  // argument, one of the types is a transparent union type and the other
5664  // type is compatible with a union member
5665  QualType lmerge = mergeTransparentUnionType(lhs, rhs, OfBlockPointer,
5666                                              Unqualified);
5667  if (!lmerge.isNull())
5668    return lmerge;
5669
5670  QualType rmerge = mergeTransparentUnionType(rhs, lhs, OfBlockPointer,
5671                                              Unqualified);
5672  if (!rmerge.isNull())
5673    return rmerge;
5674
5675  return mergeTypes(lhs, rhs, OfBlockPointer, Unqualified);
5676}
5677
5678QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs,
5679                                        bool OfBlockPointer,
5680                                        bool Unqualified) {
5681  const FunctionType *lbase = lhs->getAs<FunctionType>();
5682  const FunctionType *rbase = rhs->getAs<FunctionType>();
5683  const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase);
5684  const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase);
5685  bool allLTypes = true;
5686  bool allRTypes = true;
5687
5688  // Check return type
5689  QualType retType;
5690  if (OfBlockPointer) {
5691    QualType RHS = rbase->getResultType();
5692    QualType LHS = lbase->getResultType();
5693    bool UnqualifiedResult = Unqualified;
5694    if (!UnqualifiedResult)
5695      UnqualifiedResult = (!RHS.hasQualifiers() && LHS.hasQualifiers());
5696    retType = mergeTypes(LHS, RHS, true, UnqualifiedResult, true);
5697  }
5698  else
5699    retType = mergeTypes(lbase->getResultType(), rbase->getResultType(), false,
5700                         Unqualified);
5701  if (retType.isNull()) return QualType();
5702
5703  if (Unqualified)
5704    retType = retType.getUnqualifiedType();
5705
5706  CanQualType LRetType = getCanonicalType(lbase->getResultType());
5707  CanQualType RRetType = getCanonicalType(rbase->getResultType());
5708  if (Unqualified) {
5709    LRetType = LRetType.getUnqualifiedType();
5710    RRetType = RRetType.getUnqualifiedType();
5711  }
5712
5713  if (getCanonicalType(retType) != LRetType)
5714    allLTypes = false;
5715  if (getCanonicalType(retType) != RRetType)
5716    allRTypes = false;
5717
5718  // FIXME: double check this
5719  // FIXME: should we error if lbase->getRegParmAttr() != 0 &&
5720  //                           rbase->getRegParmAttr() != 0 &&
5721  //                           lbase->getRegParmAttr() != rbase->getRegParmAttr()?
5722  FunctionType::ExtInfo lbaseInfo = lbase->getExtInfo();
5723  FunctionType::ExtInfo rbaseInfo = rbase->getExtInfo();
5724
5725  // Compatible functions must have compatible calling conventions
5726  if (!isSameCallConv(lbaseInfo.getCC(), rbaseInfo.getCC()))
5727    return QualType();
5728
5729  // Regparm is part of the calling convention.
5730  if (lbaseInfo.getHasRegParm() != rbaseInfo.getHasRegParm())
5731    return QualType();
5732  if (lbaseInfo.getRegParm() != rbaseInfo.getRegParm())
5733    return QualType();
5734
5735  if (lbaseInfo.getProducesResult() != rbaseInfo.getProducesResult())
5736    return QualType();
5737
5738  // functypes which return are preferred over those that do not.
5739  if (lbaseInfo.getNoReturn() && !rbaseInfo.getNoReturn())
5740    allLTypes = false;
5741  else if (!lbaseInfo.getNoReturn() && rbaseInfo.getNoReturn())
5742    allRTypes = false;
5743  // FIXME: some uses, e.g. conditional exprs, really want this to be 'both'.
5744  bool NoReturn = lbaseInfo.getNoReturn() || rbaseInfo.getNoReturn();
5745
5746  FunctionType::ExtInfo einfo = lbaseInfo.withNoReturn(NoReturn);
5747
5748  if (lproto && rproto) { // two C99 style function prototypes
5749    assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() &&
5750           "C++ shouldn't be here");
5751    unsigned lproto_nargs = lproto->getNumArgs();
5752    unsigned rproto_nargs = rproto->getNumArgs();
5753
5754    // Compatible functions must have the same number of arguments
5755    if (lproto_nargs != rproto_nargs)
5756      return QualType();
5757
5758    // Variadic and non-variadic functions aren't compatible
5759    if (lproto->isVariadic() != rproto->isVariadic())
5760      return QualType();
5761
5762    if (lproto->getTypeQuals() != rproto->getTypeQuals())
5763      return QualType();
5764
5765    if (LangOpts.ObjCAutoRefCount &&
5766        !FunctionTypesMatchOnNSConsumedAttrs(rproto, lproto))
5767      return QualType();
5768
5769    // Check argument compatibility
5770    SmallVector<QualType, 10> types;
5771    for (unsigned i = 0; i < lproto_nargs; i++) {
5772      QualType largtype = lproto->getArgType(i).getUnqualifiedType();
5773      QualType rargtype = rproto->getArgType(i).getUnqualifiedType();
5774      QualType argtype = mergeFunctionArgumentTypes(largtype, rargtype,
5775                                                    OfBlockPointer,
5776                                                    Unqualified);
5777      if (argtype.isNull()) return QualType();
5778
5779      if (Unqualified)
5780        argtype = argtype.getUnqualifiedType();
5781
5782      types.push_back(argtype);
5783      if (Unqualified) {
5784        largtype = largtype.getUnqualifiedType();
5785        rargtype = rargtype.getUnqualifiedType();
5786      }
5787
5788      if (getCanonicalType(argtype) != getCanonicalType(largtype))
5789        allLTypes = false;
5790      if (getCanonicalType(argtype) != getCanonicalType(rargtype))
5791        allRTypes = false;
5792    }
5793
5794    if (allLTypes) return lhs;
5795    if (allRTypes) return rhs;
5796
5797    FunctionProtoType::ExtProtoInfo EPI = lproto->getExtProtoInfo();
5798    EPI.ExtInfo = einfo;
5799    return getFunctionType(retType, types.begin(), types.size(), EPI);
5800  }
5801
5802  if (lproto) allRTypes = false;
5803  if (rproto) allLTypes = false;
5804
5805  const FunctionProtoType *proto = lproto ? lproto : rproto;
5806  if (proto) {
5807    assert(!proto->hasExceptionSpec() && "C++ shouldn't be here");
5808    if (proto->isVariadic()) return QualType();
5809    // Check that the types are compatible with the types that
5810    // would result from default argument promotions (C99 6.7.5.3p15).
5811    // The only types actually affected are promotable integer
5812    // types and floats, which would be passed as a different
5813    // type depending on whether the prototype is visible.
5814    unsigned proto_nargs = proto->getNumArgs();
5815    for (unsigned i = 0; i < proto_nargs; ++i) {
5816      QualType argTy = proto->getArgType(i);
5817
5818      // Look at the promotion type of enum types, since that is the type used
5819      // to pass enum values.
5820      if (const EnumType *Enum = argTy->getAs<EnumType>())
5821        argTy = Enum->getDecl()->getPromotionType();
5822
5823      if (argTy->isPromotableIntegerType() ||
5824          getCanonicalType(argTy).getUnqualifiedType() == FloatTy)
5825        return QualType();
5826    }
5827
5828    if (allLTypes) return lhs;
5829    if (allRTypes) return rhs;
5830
5831    FunctionProtoType::ExtProtoInfo EPI = proto->getExtProtoInfo();
5832    EPI.ExtInfo = einfo;
5833    return getFunctionType(retType, proto->arg_type_begin(),
5834                           proto->getNumArgs(), EPI);
5835  }
5836
5837  if (allLTypes) return lhs;
5838  if (allRTypes) return rhs;
5839  return getFunctionNoProtoType(retType, einfo);
5840}
5841
5842QualType ASTContext::mergeTypes(QualType LHS, QualType RHS,
5843                                bool OfBlockPointer,
5844                                bool Unqualified, bool BlockReturnType) {
5845  // C++ [expr]: If an expression initially has the type "reference to T", the
5846  // type is adjusted to "T" prior to any further analysis, the expression
5847  // designates the object or function denoted by the reference, and the
5848  // expression is an lvalue unless the reference is an rvalue reference and
5849  // the expression is a function call (possibly inside parentheses).
5850  assert(!LHS->getAs<ReferenceType>() && "LHS is a reference type?");
5851  assert(!RHS->getAs<ReferenceType>() && "RHS is a reference type?");
5852
5853  if (Unqualified) {
5854    LHS = LHS.getUnqualifiedType();
5855    RHS = RHS.getUnqualifiedType();
5856  }
5857
5858  QualType LHSCan = getCanonicalType(LHS),
5859           RHSCan = getCanonicalType(RHS);
5860
5861  // If two types are identical, they are compatible.
5862  if (LHSCan == RHSCan)
5863    return LHS;
5864
5865  // If the qualifiers are different, the types aren't compatible... mostly.
5866  Qualifiers LQuals = LHSCan.getLocalQualifiers();
5867  Qualifiers RQuals = RHSCan.getLocalQualifiers();
5868  if (LQuals != RQuals) {
5869    // If any of these qualifiers are different, we have a type
5870    // mismatch.
5871    if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() ||
5872        LQuals.getAddressSpace() != RQuals.getAddressSpace() ||
5873        LQuals.getObjCLifetime() != RQuals.getObjCLifetime())
5874      return QualType();
5875
5876    // Exactly one GC qualifier difference is allowed: __strong is
5877    // okay if the other type has no GC qualifier but is an Objective
5878    // C object pointer (i.e. implicitly strong by default).  We fix
5879    // this by pretending that the unqualified type was actually
5880    // qualified __strong.
5881    Qualifiers::GC GC_L = LQuals.getObjCGCAttr();
5882    Qualifiers::GC GC_R = RQuals.getObjCGCAttr();
5883    assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements");
5884
5885    if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak)
5886      return QualType();
5887
5888    if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) {
5889      return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong));
5890    }
5891    if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) {
5892      return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS);
5893    }
5894    return QualType();
5895  }
5896
5897  // Okay, qualifiers are equal.
5898
5899  Type::TypeClass LHSClass = LHSCan->getTypeClass();
5900  Type::TypeClass RHSClass = RHSCan->getTypeClass();
5901
5902  // We want to consider the two function types to be the same for these
5903  // comparisons, just force one to the other.
5904  if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto;
5905  if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto;
5906
5907  // Same as above for arrays
5908  if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray)
5909    LHSClass = Type::ConstantArray;
5910  if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray)
5911    RHSClass = Type::ConstantArray;
5912
5913  // ObjCInterfaces are just specialized ObjCObjects.
5914  if (LHSClass == Type::ObjCInterface) LHSClass = Type::ObjCObject;
5915  if (RHSClass == Type::ObjCInterface) RHSClass = Type::ObjCObject;
5916
5917  // Canonicalize ExtVector -> Vector.
5918  if (LHSClass == Type::ExtVector) LHSClass = Type::Vector;
5919  if (RHSClass == Type::ExtVector) RHSClass = Type::Vector;
5920
5921  // If the canonical type classes don't match.
5922  if (LHSClass != RHSClass) {
5923    // C99 6.7.2.2p4: Each enumerated type shall be compatible with char,
5924    // a signed integer type, or an unsigned integer type.
5925    // Compatibility is based on the underlying type, not the promotion
5926    // type.
5927    if (const EnumType* ETy = LHS->getAs<EnumType>()) {
5928      QualType TINT = ETy->getDecl()->getIntegerType();
5929      if (!TINT.isNull() && hasSameType(TINT, RHSCan.getUnqualifiedType()))
5930        return RHS;
5931    }
5932    if (const EnumType* ETy = RHS->getAs<EnumType>()) {
5933      QualType TINT = ETy->getDecl()->getIntegerType();
5934      if (!TINT.isNull() && hasSameType(TINT, LHSCan.getUnqualifiedType()))
5935        return LHS;
5936    }
5937    // allow block pointer type to match an 'id' type.
5938    if (OfBlockPointer && !BlockReturnType) {
5939       if (LHS->isObjCIdType() && RHS->isBlockPointerType())
5940         return LHS;
5941      if (RHS->isObjCIdType() && LHS->isBlockPointerType())
5942        return RHS;
5943    }
5944
5945    return QualType();
5946  }
5947
5948  // The canonical type classes match.
5949  switch (LHSClass) {
5950#define TYPE(Class, Base)
5951#define ABSTRACT_TYPE(Class, Base)
5952#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class:
5953#define NON_CANONICAL_TYPE(Class, Base) case Type::Class:
5954#define DEPENDENT_TYPE(Class, Base) case Type::Class:
5955#include "clang/AST/TypeNodes.def"
5956    llvm_unreachable("Non-canonical and dependent types shouldn't get here");
5957
5958  case Type::LValueReference:
5959  case Type::RValueReference:
5960  case Type::MemberPointer:
5961    llvm_unreachable("C++ should never be in mergeTypes");
5962
5963  case Type::ObjCInterface:
5964  case Type::IncompleteArray:
5965  case Type::VariableArray:
5966  case Type::FunctionProto:
5967  case Type::ExtVector:
5968    llvm_unreachable("Types are eliminated above");
5969
5970  case Type::Pointer:
5971  {
5972    // Merge two pointer types, while trying to preserve typedef info
5973    QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType();
5974    QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType();
5975    if (Unqualified) {
5976      LHSPointee = LHSPointee.getUnqualifiedType();
5977      RHSPointee = RHSPointee.getUnqualifiedType();
5978    }
5979    QualType ResultType = mergeTypes(LHSPointee, RHSPointee, false,
5980                                     Unqualified);
5981    if (ResultType.isNull()) return QualType();
5982    if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType))
5983      return LHS;
5984    if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType))
5985      return RHS;
5986    return getPointerType(ResultType);
5987  }
5988  case Type::BlockPointer:
5989  {
5990    // Merge two block pointer types, while trying to preserve typedef info
5991    QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType();
5992    QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType();
5993    if (Unqualified) {
5994      LHSPointee = LHSPointee.getUnqualifiedType();
5995      RHSPointee = RHSPointee.getUnqualifiedType();
5996    }
5997    QualType ResultType = mergeTypes(LHSPointee, RHSPointee, OfBlockPointer,
5998                                     Unqualified);
5999    if (ResultType.isNull()) return QualType();
6000    if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType))
6001      return LHS;
6002    if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType))
6003      return RHS;
6004    return getBlockPointerType(ResultType);
6005  }
6006  case Type::Atomic:
6007  {
6008    // Merge two pointer types, while trying to preserve typedef info
6009    QualType LHSValue = LHS->getAs<AtomicType>()->getValueType();
6010    QualType RHSValue = RHS->getAs<AtomicType>()->getValueType();
6011    if (Unqualified) {
6012      LHSValue = LHSValue.getUnqualifiedType();
6013      RHSValue = RHSValue.getUnqualifiedType();
6014    }
6015    QualType ResultType = mergeTypes(LHSValue, RHSValue, false,
6016                                     Unqualified);
6017    if (ResultType.isNull()) return QualType();
6018    if (getCanonicalType(LHSValue) == getCanonicalType(ResultType))
6019      return LHS;
6020    if (getCanonicalType(RHSValue) == getCanonicalType(ResultType))
6021      return RHS;
6022    return getAtomicType(ResultType);
6023  }
6024  case Type::ConstantArray:
6025  {
6026    const ConstantArrayType* LCAT = getAsConstantArrayType(LHS);
6027    const ConstantArrayType* RCAT = getAsConstantArrayType(RHS);
6028    if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize())
6029      return QualType();
6030
6031    QualType LHSElem = getAsArrayType(LHS)->getElementType();
6032    QualType RHSElem = getAsArrayType(RHS)->getElementType();
6033    if (Unqualified) {
6034      LHSElem = LHSElem.getUnqualifiedType();
6035      RHSElem = RHSElem.getUnqualifiedType();
6036    }
6037
6038    QualType ResultType = mergeTypes(LHSElem, RHSElem, false, Unqualified);
6039    if (ResultType.isNull()) return QualType();
6040    if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType))
6041      return LHS;
6042    if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType))
6043      return RHS;
6044    if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(),
6045                                          ArrayType::ArraySizeModifier(), 0);
6046    if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(),
6047                                          ArrayType::ArraySizeModifier(), 0);
6048    const VariableArrayType* LVAT = getAsVariableArrayType(LHS);
6049    const VariableArrayType* RVAT = getAsVariableArrayType(RHS);
6050    if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType))
6051      return LHS;
6052    if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType))
6053      return RHS;
6054    if (LVAT) {
6055      // FIXME: This isn't correct! But tricky to implement because
6056      // the array's size has to be the size of LHS, but the type
6057      // has to be different.
6058      return LHS;
6059    }
6060    if (RVAT) {
6061      // FIXME: This isn't correct! But tricky to implement because
6062      // the array's size has to be the size of RHS, but the type
6063      // has to be different.
6064      return RHS;
6065    }
6066    if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS;
6067    if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS;
6068    return getIncompleteArrayType(ResultType,
6069                                  ArrayType::ArraySizeModifier(), 0);
6070  }
6071  case Type::FunctionNoProto:
6072    return mergeFunctionTypes(LHS, RHS, OfBlockPointer, Unqualified);
6073  case Type::Record:
6074  case Type::Enum:
6075    return QualType();
6076  case Type::Builtin:
6077    // Only exactly equal builtin types are compatible, which is tested above.
6078    return QualType();
6079  case Type::Complex:
6080    // Distinct complex types are incompatible.
6081    return QualType();
6082  case Type::Vector:
6083    // FIXME: The merged type should be an ExtVector!
6084    if (areCompatVectorTypes(LHSCan->getAs<VectorType>(),
6085                             RHSCan->getAs<VectorType>()))
6086      return LHS;
6087    return QualType();
6088  case Type::ObjCObject: {
6089    // Check if the types are assignment compatible.
6090    // FIXME: This should be type compatibility, e.g. whether
6091    // "LHS x; RHS x;" at global scope is legal.
6092    const ObjCObjectType* LHSIface = LHS->getAs<ObjCObjectType>();
6093    const ObjCObjectType* RHSIface = RHS->getAs<ObjCObjectType>();
6094    if (canAssignObjCInterfaces(LHSIface, RHSIface))
6095      return LHS;
6096
6097    return QualType();
6098  }
6099  case Type::ObjCObjectPointer: {
6100    if (OfBlockPointer) {
6101      if (canAssignObjCInterfacesInBlockPointer(
6102                                          LHS->getAs<ObjCObjectPointerType>(),
6103                                          RHS->getAs<ObjCObjectPointerType>(),
6104                                          BlockReturnType))
6105        return LHS;
6106      return QualType();
6107    }
6108    if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(),
6109                                RHS->getAs<ObjCObjectPointerType>()))
6110      return LHS;
6111
6112    return QualType();
6113  }
6114  }
6115
6116  llvm_unreachable("Invalid Type::Class!");
6117}
6118
6119bool ASTContext::FunctionTypesMatchOnNSConsumedAttrs(
6120                   const FunctionProtoType *FromFunctionType,
6121                   const FunctionProtoType *ToFunctionType) {
6122  if (FromFunctionType->hasAnyConsumedArgs() !=
6123      ToFunctionType->hasAnyConsumedArgs())
6124    return false;
6125  FunctionProtoType::ExtProtoInfo FromEPI =
6126    FromFunctionType->getExtProtoInfo();
6127  FunctionProtoType::ExtProtoInfo ToEPI =
6128    ToFunctionType->getExtProtoInfo();
6129  if (FromEPI.ConsumedArguments && ToEPI.ConsumedArguments)
6130    for (unsigned ArgIdx = 0, NumArgs = FromFunctionType->getNumArgs();
6131         ArgIdx != NumArgs; ++ArgIdx)  {
6132      if (FromEPI.ConsumedArguments[ArgIdx] !=
6133          ToEPI.ConsumedArguments[ArgIdx])
6134        return false;
6135    }
6136  return true;
6137}
6138
6139/// mergeObjCGCQualifiers - This routine merges ObjC's GC attribute of 'LHS' and
6140/// 'RHS' attributes and returns the merged version; including for function
6141/// return types.
6142QualType ASTContext::mergeObjCGCQualifiers(QualType LHS, QualType RHS) {
6143  QualType LHSCan = getCanonicalType(LHS),
6144  RHSCan = getCanonicalType(RHS);
6145  // If two types are identical, they are compatible.
6146  if (LHSCan == RHSCan)
6147    return LHS;
6148  if (RHSCan->isFunctionType()) {
6149    if (!LHSCan->isFunctionType())
6150      return QualType();
6151    QualType OldReturnType =
6152      cast<FunctionType>(RHSCan.getTypePtr())->getResultType();
6153    QualType NewReturnType =
6154      cast<FunctionType>(LHSCan.getTypePtr())->getResultType();
6155    QualType ResReturnType =
6156      mergeObjCGCQualifiers(NewReturnType, OldReturnType);
6157    if (ResReturnType.isNull())
6158      return QualType();
6159    if (ResReturnType == NewReturnType || ResReturnType == OldReturnType) {
6160      // id foo(); ... __strong id foo(); or: __strong id foo(); ... id foo();
6161      // In either case, use OldReturnType to build the new function type.
6162      const FunctionType *F = LHS->getAs<FunctionType>();
6163      if (const FunctionProtoType *FPT = cast<FunctionProtoType>(F)) {
6164        FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
6165        EPI.ExtInfo = getFunctionExtInfo(LHS);
6166        QualType ResultType
6167          = getFunctionType(OldReturnType, FPT->arg_type_begin(),
6168                            FPT->getNumArgs(), EPI);
6169        return ResultType;
6170      }
6171    }
6172    return QualType();
6173  }
6174
6175  // If the qualifiers are different, the types can still be merged.
6176  Qualifiers LQuals = LHSCan.getLocalQualifiers();
6177  Qualifiers RQuals = RHSCan.getLocalQualifiers();
6178  if (LQuals != RQuals) {
6179    // If any of these qualifiers are different, we have a type mismatch.
6180    if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() ||
6181        LQuals.getAddressSpace() != RQuals.getAddressSpace())
6182      return QualType();
6183
6184    // Exactly one GC qualifier difference is allowed: __strong is
6185    // okay if the other type has no GC qualifier but is an Objective
6186    // C object pointer (i.e. implicitly strong by default).  We fix
6187    // this by pretending that the unqualified type was actually
6188    // qualified __strong.
6189    Qualifiers::GC GC_L = LQuals.getObjCGCAttr();
6190    Qualifiers::GC GC_R = RQuals.getObjCGCAttr();
6191    assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements");
6192
6193    if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak)
6194      return QualType();
6195
6196    if (GC_L == Qualifiers::Strong)
6197      return LHS;
6198    if (GC_R == Qualifiers::Strong)
6199      return RHS;
6200    return QualType();
6201  }
6202
6203  if (LHSCan->isObjCObjectPointerType() && RHSCan->isObjCObjectPointerType()) {
6204    QualType LHSBaseQT = LHS->getAs<ObjCObjectPointerType>()->getPointeeType();
6205    QualType RHSBaseQT = RHS->getAs<ObjCObjectPointerType>()->getPointeeType();
6206    QualType ResQT = mergeObjCGCQualifiers(LHSBaseQT, RHSBaseQT);
6207    if (ResQT == LHSBaseQT)
6208      return LHS;
6209    if (ResQT == RHSBaseQT)
6210      return RHS;
6211  }
6212  return QualType();
6213}
6214
6215//===----------------------------------------------------------------------===//
6216//                         Integer Predicates
6217//===----------------------------------------------------------------------===//
6218
6219unsigned ASTContext::getIntWidth(QualType T) const {
6220  if (const EnumType *ET = dyn_cast<EnumType>(T))
6221    T = ET->getDecl()->getIntegerType();
6222  if (T->isBooleanType())
6223    return 1;
6224  // For builtin types, just use the standard type sizing method
6225  return (unsigned)getTypeSize(T);
6226}
6227
6228QualType ASTContext::getCorrespondingUnsignedType(QualType T) {
6229  assert(T->hasSignedIntegerRepresentation() && "Unexpected type");
6230
6231  // Turn <4 x signed int> -> <4 x unsigned int>
6232  if (const VectorType *VTy = T->getAs<VectorType>())
6233    return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()),
6234                         VTy->getNumElements(), VTy->getVectorKind());
6235
6236  // For enums, we return the unsigned version of the base type.
6237  if (const EnumType *ETy = T->getAs<EnumType>())
6238    T = ETy->getDecl()->getIntegerType();
6239
6240  const BuiltinType *BTy = T->getAs<BuiltinType>();
6241  assert(BTy && "Unexpected signed integer type");
6242  switch (BTy->getKind()) {
6243  case BuiltinType::Char_S:
6244  case BuiltinType::SChar:
6245    return UnsignedCharTy;
6246  case BuiltinType::Short:
6247    return UnsignedShortTy;
6248  case BuiltinType::Int:
6249    return UnsignedIntTy;
6250  case BuiltinType::Long:
6251    return UnsignedLongTy;
6252  case BuiltinType::LongLong:
6253    return UnsignedLongLongTy;
6254  case BuiltinType::Int128:
6255    return UnsignedInt128Ty;
6256  default:
6257    llvm_unreachable("Unexpected signed integer type");
6258  }
6259}
6260
6261ASTMutationListener::~ASTMutationListener() { }
6262
6263
6264//===----------------------------------------------------------------------===//
6265//                          Builtin Type Computation
6266//===----------------------------------------------------------------------===//
6267
6268/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the
6269/// pointer over the consumed characters.  This returns the resultant type.  If
6270/// AllowTypeModifiers is false then modifier like * are not parsed, just basic
6271/// types.  This allows "v2i*" to be parsed as a pointer to a v2i instead of
6272/// a vector of "i*".
6273///
6274/// RequiresICE is filled in on return to indicate whether the value is required
6275/// to be an Integer Constant Expression.
6276static QualType DecodeTypeFromStr(const char *&Str, const ASTContext &Context,
6277                                  ASTContext::GetBuiltinTypeError &Error,
6278                                  bool &RequiresICE,
6279                                  bool AllowTypeModifiers) {
6280  // Modifiers.
6281  int HowLong = 0;
6282  bool Signed = false, Unsigned = false;
6283  RequiresICE = false;
6284
6285  // Read the prefixed modifiers first.
6286  bool Done = false;
6287  while (!Done) {
6288    switch (*Str++) {
6289    default: Done = true; --Str; break;
6290    case 'I':
6291      RequiresICE = true;
6292      break;
6293    case 'S':
6294      assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!");
6295      assert(!Signed && "Can't use 'S' modifier multiple times!");
6296      Signed = true;
6297      break;
6298    case 'U':
6299      assert(!Signed && "Can't use both 'S' and 'U' modifiers!");
6300      assert(!Unsigned && "Can't use 'S' modifier multiple times!");
6301      Unsigned = true;
6302      break;
6303    case 'L':
6304      assert(HowLong <= 2 && "Can't have LLLL modifier");
6305      ++HowLong;
6306      break;
6307    }
6308  }
6309
6310  QualType Type;
6311
6312  // Read the base type.
6313  switch (*Str++) {
6314  default: llvm_unreachable("Unknown builtin type letter!");
6315  case 'v':
6316    assert(HowLong == 0 && !Signed && !Unsigned &&
6317           "Bad modifiers used with 'v'!");
6318    Type = Context.VoidTy;
6319    break;
6320  case 'f':
6321    assert(HowLong == 0 && !Signed && !Unsigned &&
6322           "Bad modifiers used with 'f'!");
6323    Type = Context.FloatTy;
6324    break;
6325  case 'd':
6326    assert(HowLong < 2 && !Signed && !Unsigned &&
6327           "Bad modifiers used with 'd'!");
6328    if (HowLong)
6329      Type = Context.LongDoubleTy;
6330    else
6331      Type = Context.DoubleTy;
6332    break;
6333  case 's':
6334    assert(HowLong == 0 && "Bad modifiers used with 's'!");
6335    if (Unsigned)
6336      Type = Context.UnsignedShortTy;
6337    else
6338      Type = Context.ShortTy;
6339    break;
6340  case 'i':
6341    if (HowLong == 3)
6342      Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty;
6343    else if (HowLong == 2)
6344      Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy;
6345    else if (HowLong == 1)
6346      Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy;
6347    else
6348      Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy;
6349    break;
6350  case 'c':
6351    assert(HowLong == 0 && "Bad modifiers used with 'c'!");
6352    if (Signed)
6353      Type = Context.SignedCharTy;
6354    else if (Unsigned)
6355      Type = Context.UnsignedCharTy;
6356    else
6357      Type = Context.CharTy;
6358    break;
6359  case 'b': // boolean
6360    assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!");
6361    Type = Context.BoolTy;
6362    break;
6363  case 'z':  // size_t.
6364    assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!");
6365    Type = Context.getSizeType();
6366    break;
6367  case 'F':
6368    Type = Context.getCFConstantStringType();
6369    break;
6370  case 'G':
6371    Type = Context.getObjCIdType();
6372    break;
6373  case 'H':
6374    Type = Context.getObjCSelType();
6375    break;
6376  case 'a':
6377    Type = Context.getBuiltinVaListType();
6378    assert(!Type.isNull() && "builtin va list type not initialized!");
6379    break;
6380  case 'A':
6381    // This is a "reference" to a va_list; however, what exactly
6382    // this means depends on how va_list is defined. There are two
6383    // different kinds of va_list: ones passed by value, and ones
6384    // passed by reference.  An example of a by-value va_list is
6385    // x86, where va_list is a char*. An example of by-ref va_list
6386    // is x86-64, where va_list is a __va_list_tag[1]. For x86,
6387    // we want this argument to be a char*&; for x86-64, we want
6388    // it to be a __va_list_tag*.
6389    Type = Context.getBuiltinVaListType();
6390    assert(!Type.isNull() && "builtin va list type not initialized!");
6391    if (Type->isArrayType())
6392      Type = Context.getArrayDecayedType(Type);
6393    else
6394      Type = Context.getLValueReferenceType(Type);
6395    break;
6396  case 'V': {
6397    char *End;
6398    unsigned NumElements = strtoul(Str, &End, 10);
6399    assert(End != Str && "Missing vector size");
6400    Str = End;
6401
6402    QualType ElementType = DecodeTypeFromStr(Str, Context, Error,
6403                                             RequiresICE, false);
6404    assert(!RequiresICE && "Can't require vector ICE");
6405
6406    // TODO: No way to make AltiVec vectors in builtins yet.
6407    Type = Context.getVectorType(ElementType, NumElements,
6408                                 VectorType::GenericVector);
6409    break;
6410  }
6411  case 'X': {
6412    QualType ElementType = DecodeTypeFromStr(Str, Context, Error, RequiresICE,
6413                                             false);
6414    assert(!RequiresICE && "Can't require complex ICE");
6415    Type = Context.getComplexType(ElementType);
6416    break;
6417  }
6418  case 'Y' : {
6419    Type = Context.getPointerDiffType();
6420    break;
6421  }
6422  case 'P':
6423    Type = Context.getFILEType();
6424    if (Type.isNull()) {
6425      Error = ASTContext::GE_Missing_stdio;
6426      return QualType();
6427    }
6428    break;
6429  case 'J':
6430    if (Signed)
6431      Type = Context.getsigjmp_bufType();
6432    else
6433      Type = Context.getjmp_bufType();
6434
6435    if (Type.isNull()) {
6436      Error = ASTContext::GE_Missing_setjmp;
6437      return QualType();
6438    }
6439    break;
6440  case 'K':
6441    assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'K'!");
6442    Type = Context.getucontext_tType();
6443
6444    if (Type.isNull()) {
6445      Error = ASTContext::GE_Missing_ucontext;
6446      return QualType();
6447    }
6448    break;
6449  }
6450
6451  // If there are modifiers and if we're allowed to parse them, go for it.
6452  Done = !AllowTypeModifiers;
6453  while (!Done) {
6454    switch (char c = *Str++) {
6455    default: Done = true; --Str; break;
6456    case '*':
6457    case '&': {
6458      // Both pointers and references can have their pointee types
6459      // qualified with an address space.
6460      char *End;
6461      unsigned AddrSpace = strtoul(Str, &End, 10);
6462      if (End != Str && AddrSpace != 0) {
6463        Type = Context.getAddrSpaceQualType(Type, AddrSpace);
6464        Str = End;
6465      }
6466      if (c == '*')
6467        Type = Context.getPointerType(Type);
6468      else
6469        Type = Context.getLValueReferenceType(Type);
6470      break;
6471    }
6472    // FIXME: There's no way to have a built-in with an rvalue ref arg.
6473    case 'C':
6474      Type = Type.withConst();
6475      break;
6476    case 'D':
6477      Type = Context.getVolatileType(Type);
6478      break;
6479    case 'R':
6480      Type = Type.withRestrict();
6481      break;
6482    }
6483  }
6484
6485  assert((!RequiresICE || Type->isIntegralOrEnumerationType()) &&
6486         "Integer constant 'I' type must be an integer");
6487
6488  return Type;
6489}
6490
6491/// GetBuiltinType - Return the type for the specified builtin.
6492QualType ASTContext::GetBuiltinType(unsigned Id,
6493                                    GetBuiltinTypeError &Error,
6494                                    unsigned *IntegerConstantArgs) const {
6495  const char *TypeStr = BuiltinInfo.GetTypeString(Id);
6496
6497  SmallVector<QualType, 8> ArgTypes;
6498
6499  bool RequiresICE = false;
6500  Error = GE_None;
6501  QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error,
6502                                       RequiresICE, true);
6503  if (Error != GE_None)
6504    return QualType();
6505
6506  assert(!RequiresICE && "Result of intrinsic cannot be required to be an ICE");
6507
6508  while (TypeStr[0] && TypeStr[0] != '.') {
6509    QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error, RequiresICE, true);
6510    if (Error != GE_None)
6511      return QualType();
6512
6513    // If this argument is required to be an IntegerConstantExpression and the
6514    // caller cares, fill in the bitmask we return.
6515    if (RequiresICE && IntegerConstantArgs)
6516      *IntegerConstantArgs |= 1 << ArgTypes.size();
6517
6518    // Do array -> pointer decay.  The builtin should use the decayed type.
6519    if (Ty->isArrayType())
6520      Ty = getArrayDecayedType(Ty);
6521
6522    ArgTypes.push_back(Ty);
6523  }
6524
6525  assert((TypeStr[0] != '.' || TypeStr[1] == 0) &&
6526         "'.' should only occur at end of builtin type list!");
6527
6528  FunctionType::ExtInfo EI;
6529  if (BuiltinInfo.isNoReturn(Id)) EI = EI.withNoReturn(true);
6530
6531  bool Variadic = (TypeStr[0] == '.');
6532
6533  // We really shouldn't be making a no-proto type here, especially in C++.
6534  if (ArgTypes.empty() && Variadic)
6535    return getFunctionNoProtoType(ResType, EI);
6536
6537  FunctionProtoType::ExtProtoInfo EPI;
6538  EPI.ExtInfo = EI;
6539  EPI.Variadic = Variadic;
6540
6541  return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), EPI);
6542}
6543
6544GVALinkage ASTContext::GetGVALinkageForFunction(const FunctionDecl *FD) {
6545  GVALinkage External = GVA_StrongExternal;
6546
6547  Linkage L = FD->getLinkage();
6548  switch (L) {
6549  case NoLinkage:
6550  case InternalLinkage:
6551  case UniqueExternalLinkage:
6552    return GVA_Internal;
6553
6554  case ExternalLinkage:
6555    switch (FD->getTemplateSpecializationKind()) {
6556    case TSK_Undeclared:
6557    case TSK_ExplicitSpecialization:
6558      External = GVA_StrongExternal;
6559      break;
6560
6561    case TSK_ExplicitInstantiationDefinition:
6562      return GVA_ExplicitTemplateInstantiation;
6563
6564    case TSK_ExplicitInstantiationDeclaration:
6565    case TSK_ImplicitInstantiation:
6566      External = GVA_TemplateInstantiation;
6567      break;
6568    }
6569  }
6570
6571  if (!FD->isInlined())
6572    return External;
6573
6574  if (!getLangOptions().CPlusPlus || FD->hasAttr<GNUInlineAttr>()) {
6575    // GNU or C99 inline semantics. Determine whether this symbol should be
6576    // externally visible.
6577    if (FD->isInlineDefinitionExternallyVisible())
6578      return External;
6579
6580    // C99 inline semantics, where the symbol is not externally visible.
6581    return GVA_C99Inline;
6582  }
6583
6584  // C++0x [temp.explicit]p9:
6585  //   [ Note: The intent is that an inline function that is the subject of
6586  //   an explicit instantiation declaration will still be implicitly
6587  //   instantiated when used so that the body can be considered for
6588  //   inlining, but that no out-of-line copy of the inline function would be
6589  //   generated in the translation unit. -- end note ]
6590  if (FD->getTemplateSpecializationKind()
6591                                       == TSK_ExplicitInstantiationDeclaration)
6592    return GVA_C99Inline;
6593
6594  return GVA_CXXInline;
6595}
6596
6597GVALinkage ASTContext::GetGVALinkageForVariable(const VarDecl *VD) {
6598  // If this is a static data member, compute the kind of template
6599  // specialization. Otherwise, this variable is not part of a
6600  // template.
6601  TemplateSpecializationKind TSK = TSK_Undeclared;
6602  if (VD->isStaticDataMember())
6603    TSK = VD->getTemplateSpecializationKind();
6604
6605  Linkage L = VD->getLinkage();
6606  if (L == ExternalLinkage && getLangOptions().CPlusPlus &&
6607      VD->getType()->getLinkage() == UniqueExternalLinkage)
6608    L = UniqueExternalLinkage;
6609
6610  switch (L) {
6611  case NoLinkage:
6612  case InternalLinkage:
6613  case UniqueExternalLinkage:
6614    return GVA_Internal;
6615
6616  case ExternalLinkage:
6617    switch (TSK) {
6618    case TSK_Undeclared:
6619    case TSK_ExplicitSpecialization:
6620      return GVA_StrongExternal;
6621
6622    case TSK_ExplicitInstantiationDeclaration:
6623      llvm_unreachable("Variable should not be instantiated");
6624      // Fall through to treat this like any other instantiation.
6625
6626    case TSK_ExplicitInstantiationDefinition:
6627      return GVA_ExplicitTemplateInstantiation;
6628
6629    case TSK_ImplicitInstantiation:
6630      return GVA_TemplateInstantiation;
6631    }
6632  }
6633
6634  llvm_unreachable("Invalid Linkage!");
6635}
6636
6637bool ASTContext::DeclMustBeEmitted(const Decl *D) {
6638  if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
6639    if (!VD->isFileVarDecl())
6640      return false;
6641  } else if (!isa<FunctionDecl>(D))
6642    return false;
6643
6644  // Weak references don't produce any output by themselves.
6645  if (D->hasAttr<WeakRefAttr>())
6646    return false;
6647
6648  // Aliases and used decls are required.
6649  if (D->hasAttr<AliasAttr>() || D->hasAttr<UsedAttr>())
6650    return true;
6651
6652  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
6653    // Forward declarations aren't required.
6654    if (!FD->doesThisDeclarationHaveABody())
6655      return FD->doesDeclarationForceExternallyVisibleDefinition();
6656
6657    // Constructors and destructors are required.
6658    if (FD->hasAttr<ConstructorAttr>() || FD->hasAttr<DestructorAttr>())
6659      return true;
6660
6661    // The key function for a class is required.
6662    if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
6663      const CXXRecordDecl *RD = MD->getParent();
6664      if (MD->isOutOfLine() && RD->isDynamicClass()) {
6665        const CXXMethodDecl *KeyFunc = getKeyFunction(RD);
6666        if (KeyFunc && KeyFunc->getCanonicalDecl() == MD->getCanonicalDecl())
6667          return true;
6668      }
6669    }
6670
6671    GVALinkage Linkage = GetGVALinkageForFunction(FD);
6672
6673    // static, static inline, always_inline, and extern inline functions can
6674    // always be deferred.  Normal inline functions can be deferred in C99/C++.
6675    // Implicit template instantiations can also be deferred in C++.
6676    if (Linkage == GVA_Internal  || Linkage == GVA_C99Inline ||
6677        Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
6678      return false;
6679    return true;
6680  }
6681
6682  const VarDecl *VD = cast<VarDecl>(D);
6683  assert(VD->isFileVarDecl() && "Expected file scoped var");
6684
6685  if (VD->isThisDeclarationADefinition() == VarDecl::DeclarationOnly)
6686    return false;
6687
6688  // Structs that have non-trivial constructors or destructors are required.
6689
6690  // FIXME: Handle references.
6691  // FIXME: Be more selective about which constructors we care about.
6692  if (const RecordType *RT = VD->getType()->getAs<RecordType>()) {
6693    if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
6694      if (RD->hasDefinition() && !(RD->hasTrivialDefaultConstructor() &&
6695                                   RD->hasTrivialCopyConstructor() &&
6696                                   RD->hasTrivialMoveConstructor() &&
6697                                   RD->hasTrivialDestructor()))
6698        return true;
6699    }
6700  }
6701
6702  GVALinkage L = GetGVALinkageForVariable(VD);
6703  if (L == GVA_Internal || L == GVA_TemplateInstantiation) {
6704    if (!(VD->getInit() && VD->getInit()->HasSideEffects(*this)))
6705      return false;
6706  }
6707
6708  return true;
6709}
6710
6711CallingConv ASTContext::getDefaultMethodCallConv() {
6712  // Pass through to the C++ ABI object
6713  return ABI->getDefaultMethodCallConv();
6714}
6715
6716bool ASTContext::isNearlyEmpty(const CXXRecordDecl *RD) const {
6717  // Pass through to the C++ ABI object
6718  return ABI->isNearlyEmpty(RD);
6719}
6720
6721MangleContext *ASTContext::createMangleContext() {
6722  switch (Target->getCXXABI()) {
6723  case CXXABI_ARM:
6724  case CXXABI_Itanium:
6725    return createItaniumMangleContext(*this, getDiagnostics());
6726  case CXXABI_Microsoft:
6727    return createMicrosoftMangleContext(*this, getDiagnostics());
6728  }
6729  llvm_unreachable("Unsupported ABI");
6730}
6731
6732CXXABI::~CXXABI() {}
6733
6734size_t ASTContext::getSideTableAllocatedMemory() const {
6735  return ASTRecordLayouts.getMemorySize()
6736    + llvm::capacity_in_bytes(ObjCLayouts)
6737    + llvm::capacity_in_bytes(KeyFunctions)
6738    + llvm::capacity_in_bytes(ObjCImpls)
6739    + llvm::capacity_in_bytes(BlockVarCopyInits)
6740    + llvm::capacity_in_bytes(DeclAttrs)
6741    + llvm::capacity_in_bytes(InstantiatedFromStaticDataMember)
6742    + llvm::capacity_in_bytes(InstantiatedFromUsingDecl)
6743    + llvm::capacity_in_bytes(InstantiatedFromUsingShadowDecl)
6744    + llvm::capacity_in_bytes(InstantiatedFromUnnamedFieldDecl)
6745    + llvm::capacity_in_bytes(OverriddenMethods)
6746    + llvm::capacity_in_bytes(Types)
6747    + llvm::capacity_in_bytes(VariableArrayTypes)
6748    + llvm::capacity_in_bytes(ClassScopeSpecializationPattern);
6749}
6750
6751void ASTContext::setParameterIndex(const ParmVarDecl *D, unsigned int index) {
6752  ParamIndices[D] = index;
6753}
6754
6755unsigned ASTContext::getParameterIndex(const ParmVarDecl *D) const {
6756  ParameterIndexTable::const_iterator I = ParamIndices.find(D);
6757  assert(I != ParamIndices.end() &&
6758         "ParmIndices lacks entry set by ParmVarDecl");
6759  return I->second;
6760}
6761