ASTContext.cpp revision af8ca37a7fa45bff84831706c6d85f9e5b4e1d15
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 "CXXABI.h" 34 35using namespace clang; 36 37unsigned ASTContext::NumImplicitDefaultConstructors; 38unsigned ASTContext::NumImplicitDefaultConstructorsDeclared; 39unsigned ASTContext::NumImplicitCopyConstructors; 40unsigned ASTContext::NumImplicitCopyConstructorsDeclared; 41unsigned ASTContext::NumImplicitCopyAssignmentOperators; 42unsigned ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 43unsigned ASTContext::NumImplicitDestructors; 44unsigned ASTContext::NumImplicitDestructorsDeclared; 45 46enum FloatingRank { 47 FloatRank, DoubleRank, LongDoubleRank 48}; 49 50void 51ASTContext::CanonicalTemplateTemplateParm::Profile(llvm::FoldingSetNodeID &ID, 52 TemplateTemplateParmDecl *Parm) { 53 ID.AddInteger(Parm->getDepth()); 54 ID.AddInteger(Parm->getPosition()); 55 ID.AddBoolean(Parm->isParameterPack()); 56 57 TemplateParameterList *Params = Parm->getTemplateParameters(); 58 ID.AddInteger(Params->size()); 59 for (TemplateParameterList::const_iterator P = Params->begin(), 60 PEnd = Params->end(); 61 P != PEnd; ++P) { 62 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*P)) { 63 ID.AddInteger(0); 64 ID.AddBoolean(TTP->isParameterPack()); 65 continue; 66 } 67 68 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(*P)) { 69 ID.AddInteger(1); 70 ID.AddBoolean(NTTP->isParameterPack()); 71 ID.AddPointer(NTTP->getType().getAsOpaquePtr()); 72 if (NTTP->isExpandedParameterPack()) { 73 ID.AddBoolean(true); 74 ID.AddInteger(NTTP->getNumExpansionTypes()); 75 for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I) 76 ID.AddPointer(NTTP->getExpansionType(I).getAsOpaquePtr()); 77 } else 78 ID.AddBoolean(false); 79 continue; 80 } 81 82 TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(*P); 83 ID.AddInteger(2); 84 Profile(ID, TTP); 85 } 86} 87 88TemplateTemplateParmDecl * 89ASTContext::getCanonicalTemplateTemplateParmDecl( 90 TemplateTemplateParmDecl *TTP) const { 91 // Check if we already have a canonical template template parameter. 92 llvm::FoldingSetNodeID ID; 93 CanonicalTemplateTemplateParm::Profile(ID, TTP); 94 void *InsertPos = 0; 95 CanonicalTemplateTemplateParm *Canonical 96 = CanonTemplateTemplateParms.FindNodeOrInsertPos(ID, InsertPos); 97 if (Canonical) 98 return Canonical->getParam(); 99 100 // Build a canonical template parameter list. 101 TemplateParameterList *Params = TTP->getTemplateParameters(); 102 llvm::SmallVector<NamedDecl *, 4> CanonParams; 103 CanonParams.reserve(Params->size()); 104 for (TemplateParameterList::const_iterator P = Params->begin(), 105 PEnd = Params->end(); 106 P != PEnd; ++P) { 107 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*P)) 108 CanonParams.push_back( 109 TemplateTypeParmDecl::Create(*this, getTranslationUnitDecl(), 110 SourceLocation(), TTP->getDepth(), 111 TTP->getIndex(), 0, false, 112 TTP->isParameterPack())); 113 else if (NonTypeTemplateParmDecl *NTTP 114 = dyn_cast<NonTypeTemplateParmDecl>(*P)) { 115 QualType T = getCanonicalType(NTTP->getType()); 116 TypeSourceInfo *TInfo = getTrivialTypeSourceInfo(T); 117 NonTypeTemplateParmDecl *Param; 118 if (NTTP->isExpandedParameterPack()) { 119 llvm::SmallVector<QualType, 2> ExpandedTypes; 120 llvm::SmallVector<TypeSourceInfo *, 2> ExpandedTInfos; 121 for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I) { 122 ExpandedTypes.push_back(getCanonicalType(NTTP->getExpansionType(I))); 123 ExpandedTInfos.push_back( 124 getTrivialTypeSourceInfo(ExpandedTypes.back())); 125 } 126 127 Param = NonTypeTemplateParmDecl::Create(*this, getTranslationUnitDecl(), 128 SourceLocation(), 129 NTTP->getDepth(), 130 NTTP->getPosition(), 0, 131 T, 132 TInfo, 133 ExpandedTypes.data(), 134 ExpandedTypes.size(), 135 ExpandedTInfos.data()); 136 } else { 137 Param = NonTypeTemplateParmDecl::Create(*this, getTranslationUnitDecl(), 138 SourceLocation(), 139 NTTP->getDepth(), 140 NTTP->getPosition(), 0, 141 T, 142 NTTP->isParameterPack(), 143 TInfo); 144 } 145 CanonParams.push_back(Param); 146 147 } else 148 CanonParams.push_back(getCanonicalTemplateTemplateParmDecl( 149 cast<TemplateTemplateParmDecl>(*P))); 150 } 151 152 TemplateTemplateParmDecl *CanonTTP 153 = TemplateTemplateParmDecl::Create(*this, getTranslationUnitDecl(), 154 SourceLocation(), TTP->getDepth(), 155 TTP->getPosition(), 156 TTP->isParameterPack(), 157 0, 158 TemplateParameterList::Create(*this, SourceLocation(), 159 SourceLocation(), 160 CanonParams.data(), 161 CanonParams.size(), 162 SourceLocation())); 163 164 // Get the new insert position for the node we care about. 165 Canonical = CanonTemplateTemplateParms.FindNodeOrInsertPos(ID, InsertPos); 166 assert(Canonical == 0 && "Shouldn't be in the map!"); 167 (void)Canonical; 168 169 // Create the canonical template template parameter entry. 170 Canonical = new (*this) CanonicalTemplateTemplateParm(CanonTTP); 171 CanonTemplateTemplateParms.InsertNode(Canonical, InsertPos); 172 return CanonTTP; 173} 174 175CXXABI *ASTContext::createCXXABI(const TargetInfo &T) { 176 if (!LangOpts.CPlusPlus) return 0; 177 178 switch (T.getCXXABI()) { 179 case CXXABI_ARM: 180 return CreateARMCXXABI(*this); 181 case CXXABI_Itanium: 182 return CreateItaniumCXXABI(*this); 183 case CXXABI_Microsoft: 184 return CreateMicrosoftCXXABI(*this); 185 } 186 return 0; 187} 188 189ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 190 const TargetInfo &t, 191 IdentifierTable &idents, SelectorTable &sels, 192 Builtin::Context &builtins, 193 unsigned size_reserve) : 194 TemplateSpecializationTypes(this_()), 195 DependentTemplateSpecializationTypes(this_()), 196 GlobalNestedNameSpecifier(0), IsInt128Installed(false), 197 CFConstantStringTypeDecl(0), NSConstantStringTypeDecl(0), 198 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 199 sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0), 200 cudaConfigureCallDecl(0), 201 NullTypeSourceInfo(QualType()), 202 SourceMgr(SM), LangOpts(LOpts), ABI(createCXXABI(t)), Target(t), 203 Idents(idents), Selectors(sels), 204 BuiltinInfo(builtins), 205 DeclarationNames(*this), 206 ExternalSource(0), Listener(0), PrintingPolicy(LOpts), 207 LastSDM(0, 0), 208 UniqueBlockByRefTypeID(0), UniqueBlockParmTypeID(0) { 209 ObjCIdRedefinitionType = QualType(); 210 ObjCClassRedefinitionType = QualType(); 211 ObjCSelRedefinitionType = QualType(); 212 if (size_reserve > 0) Types.reserve(size_reserve); 213 TUDecl = TranslationUnitDecl::Create(*this); 214 InitBuiltinTypes(); 215} 216 217ASTContext::~ASTContext() { 218 // Release the DenseMaps associated with DeclContext objects. 219 // FIXME: Is this the ideal solution? 220 ReleaseDeclContextMaps(); 221 222 // Call all of the deallocation functions. 223 for (unsigned I = 0, N = Deallocations.size(); I != N; ++I) 224 Deallocations[I].first(Deallocations[I].second); 225 226 // Release all of the memory associated with overridden C++ methods. 227 for (llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::iterator 228 OM = OverriddenMethods.begin(), OMEnd = OverriddenMethods.end(); 229 OM != OMEnd; ++OM) 230 OM->second.Destroy(); 231 232 // ASTRecordLayout objects in ASTRecordLayouts must always be destroyed 233 // because they can contain DenseMaps. 234 for (llvm::DenseMap<const ObjCContainerDecl*, 235 const ASTRecordLayout*>::iterator 236 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); I != E; ) 237 // Increment in loop to prevent using deallocated memory. 238 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 239 R->Destroy(*this); 240 241 for (llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 242 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); I != E; ) { 243 // Increment in loop to prevent using deallocated memory. 244 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 245 R->Destroy(*this); 246 } 247 248 for (llvm::DenseMap<const Decl*, AttrVec*>::iterator A = DeclAttrs.begin(), 249 AEnd = DeclAttrs.end(); 250 A != AEnd; ++A) 251 A->second->~AttrVec(); 252} 253 254void ASTContext::AddDeallocation(void (*Callback)(void*), void *Data) { 255 Deallocations.push_back(std::make_pair(Callback, Data)); 256} 257 258void 259ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 260 ExternalSource.reset(Source.take()); 261} 262 263void ASTContext::PrintStats() const { 264 fprintf(stderr, "*** AST Context Stats:\n"); 265 fprintf(stderr, " %d types total.\n", (int)Types.size()); 266 267 unsigned counts[] = { 268#define TYPE(Name, Parent) 0, 269#define ABSTRACT_TYPE(Name, Parent) 270#include "clang/AST/TypeNodes.def" 271 0 // Extra 272 }; 273 274 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 275 Type *T = Types[i]; 276 counts[(unsigned)T->getTypeClass()]++; 277 } 278 279 unsigned Idx = 0; 280 unsigned TotalBytes = 0; 281#define TYPE(Name, Parent) \ 282 if (counts[Idx]) \ 283 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 284 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 285 ++Idx; 286#define ABSTRACT_TYPE(Name, Parent) 287#include "clang/AST/TypeNodes.def" 288 289 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 290 291 // Implicit special member functions. 292 fprintf(stderr, " %u/%u implicit default constructors created\n", 293 NumImplicitDefaultConstructorsDeclared, 294 NumImplicitDefaultConstructors); 295 fprintf(stderr, " %u/%u implicit copy constructors created\n", 296 NumImplicitCopyConstructorsDeclared, 297 NumImplicitCopyConstructors); 298 fprintf(stderr, " %u/%u implicit copy assignment operators created\n", 299 NumImplicitCopyAssignmentOperatorsDeclared, 300 NumImplicitCopyAssignmentOperators); 301 fprintf(stderr, " %u/%u implicit destructors created\n", 302 NumImplicitDestructorsDeclared, NumImplicitDestructors); 303 304 if (ExternalSource.get()) { 305 fprintf(stderr, "\n"); 306 ExternalSource->PrintStats(); 307 } 308 309 BumpAlloc.PrintStats(); 310} 311 312 313void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 314 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 315 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 316 Types.push_back(Ty); 317} 318 319void ASTContext::InitBuiltinTypes() { 320 assert(VoidTy.isNull() && "Context reinitialized?"); 321 322 // C99 6.2.5p19. 323 InitBuiltinType(VoidTy, BuiltinType::Void); 324 325 // C99 6.2.5p2. 326 InitBuiltinType(BoolTy, BuiltinType::Bool); 327 // C99 6.2.5p3. 328 if (LangOpts.CharIsSigned) 329 InitBuiltinType(CharTy, BuiltinType::Char_S); 330 else 331 InitBuiltinType(CharTy, BuiltinType::Char_U); 332 // C99 6.2.5p4. 333 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 334 InitBuiltinType(ShortTy, BuiltinType::Short); 335 InitBuiltinType(IntTy, BuiltinType::Int); 336 InitBuiltinType(LongTy, BuiltinType::Long); 337 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 338 339 // C99 6.2.5p6. 340 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 341 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 342 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 343 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 344 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 345 346 // C99 6.2.5p10. 347 InitBuiltinType(FloatTy, BuiltinType::Float); 348 InitBuiltinType(DoubleTy, BuiltinType::Double); 349 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 350 351 // GNU extension, 128-bit integers. 352 InitBuiltinType(Int128Ty, BuiltinType::Int128); 353 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 354 355 if (LangOpts.CPlusPlus) { // C++ 3.9.1p5 356 if (!LangOpts.ShortWChar) 357 InitBuiltinType(WCharTy, BuiltinType::WChar_S); 358 else // -fshort-wchar makes wchar_t be unsigned. 359 InitBuiltinType(WCharTy, BuiltinType::WChar_U); 360 } else // C99 361 WCharTy = getFromTargetType(Target.getWCharType()); 362 363 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 364 InitBuiltinType(Char16Ty, BuiltinType::Char16); 365 else // C99 366 Char16Ty = getFromTargetType(Target.getChar16Type()); 367 368 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 369 InitBuiltinType(Char32Ty, BuiltinType::Char32); 370 else // C99 371 Char32Ty = getFromTargetType(Target.getChar32Type()); 372 373 // Placeholder type for type-dependent expressions whose type is 374 // completely unknown. No code should ever check a type against 375 // DependentTy and users should never see it; however, it is here to 376 // help diagnose failures to properly check for type-dependent 377 // expressions. 378 InitBuiltinType(DependentTy, BuiltinType::Dependent); 379 380 // Placeholder type for functions. 381 InitBuiltinType(OverloadTy, BuiltinType::Overload); 382 383 // Placeholder type for C++0x auto declarations whose real type has 384 // not yet been deduced. 385 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 386 387 // C99 6.2.5p11. 388 FloatComplexTy = getComplexType(FloatTy); 389 DoubleComplexTy = getComplexType(DoubleTy); 390 LongDoubleComplexTy = getComplexType(LongDoubleTy); 391 392 BuiltinVaListType = QualType(); 393 394 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 395 ObjCIdTypedefType = QualType(); 396 ObjCClassTypedefType = QualType(); 397 ObjCSelTypedefType = QualType(); 398 399 // Builtin types for 'id', 'Class', and 'SEL'. 400 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 401 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 402 InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel); 403 404 ObjCConstantStringType = QualType(); 405 406 // void * type 407 VoidPtrTy = getPointerType(VoidTy); 408 409 // nullptr type (C++0x 2.14.7) 410 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 411} 412 413Diagnostic &ASTContext::getDiagnostics() const { 414 return SourceMgr.getDiagnostics(); 415} 416 417AttrVec& ASTContext::getDeclAttrs(const Decl *D) { 418 AttrVec *&Result = DeclAttrs[D]; 419 if (!Result) { 420 void *Mem = Allocate(sizeof(AttrVec)); 421 Result = new (Mem) AttrVec; 422 } 423 424 return *Result; 425} 426 427/// \brief Erase the attributes corresponding to the given declaration. 428void ASTContext::eraseDeclAttrs(const Decl *D) { 429 llvm::DenseMap<const Decl*, AttrVec*>::iterator Pos = DeclAttrs.find(D); 430 if (Pos != DeclAttrs.end()) { 431 Pos->second->~AttrVec(); 432 DeclAttrs.erase(Pos); 433 } 434} 435 436 437MemberSpecializationInfo * 438ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 439 assert(Var->isStaticDataMember() && "Not a static data member"); 440 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 441 = InstantiatedFromStaticDataMember.find(Var); 442 if (Pos == InstantiatedFromStaticDataMember.end()) 443 return 0; 444 445 return Pos->second; 446} 447 448void 449ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 450 TemplateSpecializationKind TSK, 451 SourceLocation PointOfInstantiation) { 452 assert(Inst->isStaticDataMember() && "Not a static data member"); 453 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 454 assert(!InstantiatedFromStaticDataMember[Inst] && 455 "Already noted what static data member was instantiated from"); 456 InstantiatedFromStaticDataMember[Inst] 457 = new (*this) MemberSpecializationInfo(Tmpl, TSK, PointOfInstantiation); 458} 459 460NamedDecl * 461ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) { 462 llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos 463 = InstantiatedFromUsingDecl.find(UUD); 464 if (Pos == InstantiatedFromUsingDecl.end()) 465 return 0; 466 467 return Pos->second; 468} 469 470void 471ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) { 472 assert((isa<UsingDecl>(Pattern) || 473 isa<UnresolvedUsingValueDecl>(Pattern) || 474 isa<UnresolvedUsingTypenameDecl>(Pattern)) && 475 "pattern decl is not a using decl"); 476 assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists"); 477 InstantiatedFromUsingDecl[Inst] = Pattern; 478} 479 480UsingShadowDecl * 481ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) { 482 llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos 483 = InstantiatedFromUsingShadowDecl.find(Inst); 484 if (Pos == InstantiatedFromUsingShadowDecl.end()) 485 return 0; 486 487 return Pos->second; 488} 489 490void 491ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst, 492 UsingShadowDecl *Pattern) { 493 assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists"); 494 InstantiatedFromUsingShadowDecl[Inst] = Pattern; 495} 496 497FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 498 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 499 = InstantiatedFromUnnamedFieldDecl.find(Field); 500 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 501 return 0; 502 503 return Pos->second; 504} 505 506void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 507 FieldDecl *Tmpl) { 508 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 509 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 510 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 511 "Already noted what unnamed field was instantiated from"); 512 513 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 514} 515 516ASTContext::overridden_cxx_method_iterator 517ASTContext::overridden_methods_begin(const CXXMethodDecl *Method) const { 518 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 519 = OverriddenMethods.find(Method); 520 if (Pos == OverriddenMethods.end()) 521 return 0; 522 523 return Pos->second.begin(); 524} 525 526ASTContext::overridden_cxx_method_iterator 527ASTContext::overridden_methods_end(const CXXMethodDecl *Method) const { 528 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 529 = OverriddenMethods.find(Method); 530 if (Pos == OverriddenMethods.end()) 531 return 0; 532 533 return Pos->second.end(); 534} 535 536unsigned 537ASTContext::overridden_methods_size(const CXXMethodDecl *Method) const { 538 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 539 = OverriddenMethods.find(Method); 540 if (Pos == OverriddenMethods.end()) 541 return 0; 542 543 return Pos->second.size(); 544} 545 546void ASTContext::addOverriddenMethod(const CXXMethodDecl *Method, 547 const CXXMethodDecl *Overridden) { 548 OverriddenMethods[Method].push_back(Overridden); 549} 550 551//===----------------------------------------------------------------------===// 552// Type Sizing and Analysis 553//===----------------------------------------------------------------------===// 554 555/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 556/// scalar floating point type. 557const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 558 const BuiltinType *BT = T->getAs<BuiltinType>(); 559 assert(BT && "Not a floating point type!"); 560 switch (BT->getKind()) { 561 default: assert(0 && "Not a floating point type!"); 562 case BuiltinType::Float: return Target.getFloatFormat(); 563 case BuiltinType::Double: return Target.getDoubleFormat(); 564 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 565 } 566} 567 568/// getDeclAlign - Return a conservative estimate of the alignment of the 569/// specified decl. Note that bitfields do not have a valid alignment, so 570/// this method will assert on them. 571/// If @p RefAsPointee, references are treated like their underlying type 572/// (for alignof), else they're treated like pointers (for CodeGen). 573CharUnits ASTContext::getDeclAlign(const Decl *D, bool RefAsPointee) const { 574 unsigned Align = Target.getCharWidth(); 575 576 bool UseAlignAttrOnly = false; 577 if (unsigned AlignFromAttr = D->getMaxAlignment()) { 578 Align = AlignFromAttr; 579 580 // __attribute__((aligned)) can increase or decrease alignment 581 // *except* on a struct or struct member, where it only increases 582 // alignment unless 'packed' is also specified. 583 // 584 // It is an error for [[align]] to decrease alignment, so we can 585 // ignore that possibility; Sema should diagnose it. 586 if (isa<FieldDecl>(D)) { 587 UseAlignAttrOnly = D->hasAttr<PackedAttr>() || 588 cast<FieldDecl>(D)->getParent()->hasAttr<PackedAttr>(); 589 } else { 590 UseAlignAttrOnly = true; 591 } 592 } 593 594 // If we're using the align attribute only, just ignore everything 595 // else about the declaration and its type. 596 if (UseAlignAttrOnly) { 597 // do nothing 598 599 } else if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 600 QualType T = VD->getType(); 601 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 602 if (RefAsPointee) 603 T = RT->getPointeeType(); 604 else 605 T = getPointerType(RT->getPointeeType()); 606 } 607 if (!T->isIncompleteType() && !T->isFunctionType()) { 608 // Adjust alignments of declarations with array type by the 609 // large-array alignment on the target. 610 unsigned MinWidth = Target.getLargeArrayMinWidth(); 611 const ArrayType *arrayType; 612 if (MinWidth && (arrayType = getAsArrayType(T))) { 613 if (isa<VariableArrayType>(arrayType)) 614 Align = std::max(Align, Target.getLargeArrayAlign()); 615 else if (isa<ConstantArrayType>(arrayType) && 616 MinWidth <= getTypeSize(cast<ConstantArrayType>(arrayType))) 617 Align = std::max(Align, Target.getLargeArrayAlign()); 618 619 // Walk through any array types while we're at it. 620 T = getBaseElementType(arrayType); 621 } 622 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 623 } 624 625 // Fields can be subject to extra alignment constraints, like if 626 // the field is packed, the struct is packed, or the struct has a 627 // a max-field-alignment constraint (#pragma pack). So calculate 628 // the actual alignment of the field within the struct, and then 629 // (as we're expected to) constrain that by the alignment of the type. 630 if (const FieldDecl *field = dyn_cast<FieldDecl>(VD)) { 631 // So calculate the alignment of the field. 632 const ASTRecordLayout &layout = getASTRecordLayout(field->getParent()); 633 634 // Start with the record's overall alignment. 635 unsigned fieldAlign = layout.getAlignment(); 636 637 // Use the GCD of that and the offset within the record. 638 uint64_t offset = layout.getFieldOffset(field->getFieldIndex()); 639 if (offset > 0) { 640 // Alignment is always a power of 2, so the GCD will be a power of 2, 641 // which means we get to do this crazy thing instead of Euclid's. 642 uint64_t lowBitOfOffset = offset & (~offset + 1); 643 if (lowBitOfOffset < fieldAlign) 644 fieldAlign = static_cast<unsigned>(lowBitOfOffset); 645 } 646 647 Align = std::min(Align, fieldAlign); 648 } 649 } 650 651 return toCharUnitsFromBits(Align); 652} 653 654std::pair<CharUnits, CharUnits> 655ASTContext::getTypeInfoInChars(const Type *T) { 656 std::pair<uint64_t, unsigned> Info = getTypeInfo(T); 657 return std::make_pair(toCharUnitsFromBits(Info.first), 658 toCharUnitsFromBits(Info.second)); 659} 660 661std::pair<CharUnits, CharUnits> 662ASTContext::getTypeInfoInChars(QualType T) { 663 return getTypeInfoInChars(T.getTypePtr()); 664} 665 666/// getTypeSize - Return the size of the specified type, in bits. This method 667/// does not work on incomplete types. 668/// 669/// FIXME: Pointers into different addr spaces could have different sizes and 670/// alignment requirements: getPointerInfo should take an AddrSpace, this 671/// should take a QualType, &c. 672std::pair<uint64_t, unsigned> 673ASTContext::getTypeInfo(const Type *T) const { 674 uint64_t Width=0; 675 unsigned Align=8; 676 switch (T->getTypeClass()) { 677#define TYPE(Class, Base) 678#define ABSTRACT_TYPE(Class, Base) 679#define NON_CANONICAL_TYPE(Class, Base) 680#define DEPENDENT_TYPE(Class, Base) case Type::Class: 681#include "clang/AST/TypeNodes.def" 682 assert(false && "Should not see dependent types"); 683 break; 684 685 case Type::FunctionNoProto: 686 case Type::FunctionProto: 687 // GCC extension: alignof(function) = 32 bits 688 Width = 0; 689 Align = 32; 690 break; 691 692 case Type::IncompleteArray: 693 case Type::VariableArray: 694 Width = 0; 695 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 696 break; 697 698 case Type::ConstantArray: { 699 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 700 701 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 702 Width = EltInfo.first*CAT->getSize().getZExtValue(); 703 Align = EltInfo.second; 704 break; 705 } 706 case Type::ExtVector: 707 case Type::Vector: { 708 const VectorType *VT = cast<VectorType>(T); 709 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 710 Width = EltInfo.first*VT->getNumElements(); 711 Align = Width; 712 // If the alignment is not a power of 2, round up to the next power of 2. 713 // This happens for non-power-of-2 length vectors. 714 if (Align & (Align-1)) { 715 Align = llvm::NextPowerOf2(Align); 716 Width = llvm::RoundUpToAlignment(Width, Align); 717 } 718 break; 719 } 720 721 case Type::Builtin: 722 switch (cast<BuiltinType>(T)->getKind()) { 723 default: assert(0 && "Unknown builtin type!"); 724 case BuiltinType::Void: 725 // GCC extension: alignof(void) = 8 bits. 726 Width = 0; 727 Align = 8; 728 break; 729 730 case BuiltinType::Bool: 731 Width = Target.getBoolWidth(); 732 Align = Target.getBoolAlign(); 733 break; 734 case BuiltinType::Char_S: 735 case BuiltinType::Char_U: 736 case BuiltinType::UChar: 737 case BuiltinType::SChar: 738 Width = Target.getCharWidth(); 739 Align = Target.getCharAlign(); 740 break; 741 case BuiltinType::WChar_S: 742 case BuiltinType::WChar_U: 743 Width = Target.getWCharWidth(); 744 Align = Target.getWCharAlign(); 745 break; 746 case BuiltinType::Char16: 747 Width = Target.getChar16Width(); 748 Align = Target.getChar16Align(); 749 break; 750 case BuiltinType::Char32: 751 Width = Target.getChar32Width(); 752 Align = Target.getChar32Align(); 753 break; 754 case BuiltinType::UShort: 755 case BuiltinType::Short: 756 Width = Target.getShortWidth(); 757 Align = Target.getShortAlign(); 758 break; 759 case BuiltinType::UInt: 760 case BuiltinType::Int: 761 Width = Target.getIntWidth(); 762 Align = Target.getIntAlign(); 763 break; 764 case BuiltinType::ULong: 765 case BuiltinType::Long: 766 Width = Target.getLongWidth(); 767 Align = Target.getLongAlign(); 768 break; 769 case BuiltinType::ULongLong: 770 case BuiltinType::LongLong: 771 Width = Target.getLongLongWidth(); 772 Align = Target.getLongLongAlign(); 773 break; 774 case BuiltinType::Int128: 775 case BuiltinType::UInt128: 776 Width = 128; 777 Align = 128; // int128_t is 128-bit aligned on all targets. 778 break; 779 case BuiltinType::Float: 780 Width = Target.getFloatWidth(); 781 Align = Target.getFloatAlign(); 782 break; 783 case BuiltinType::Double: 784 Width = Target.getDoubleWidth(); 785 Align = Target.getDoubleAlign(); 786 break; 787 case BuiltinType::LongDouble: 788 Width = Target.getLongDoubleWidth(); 789 Align = Target.getLongDoubleAlign(); 790 break; 791 case BuiltinType::NullPtr: 792 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 793 Align = Target.getPointerAlign(0); // == sizeof(void*) 794 break; 795 case BuiltinType::ObjCId: 796 case BuiltinType::ObjCClass: 797 case BuiltinType::ObjCSel: 798 Width = Target.getPointerWidth(0); 799 Align = Target.getPointerAlign(0); 800 break; 801 } 802 break; 803 case Type::ObjCObjectPointer: 804 Width = Target.getPointerWidth(0); 805 Align = Target.getPointerAlign(0); 806 break; 807 case Type::BlockPointer: { 808 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 809 Width = Target.getPointerWidth(AS); 810 Align = Target.getPointerAlign(AS); 811 break; 812 } 813 case Type::LValueReference: 814 case Type::RValueReference: { 815 // alignof and sizeof should never enter this code path here, so we go 816 // the pointer route. 817 unsigned AS = cast<ReferenceType>(T)->getPointeeType().getAddressSpace(); 818 Width = Target.getPointerWidth(AS); 819 Align = Target.getPointerAlign(AS); 820 break; 821 } 822 case Type::Pointer: { 823 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 824 Width = Target.getPointerWidth(AS); 825 Align = Target.getPointerAlign(AS); 826 break; 827 } 828 case Type::MemberPointer: { 829 const MemberPointerType *MPT = cast<MemberPointerType>(T); 830 std::pair<uint64_t, unsigned> PtrDiffInfo = 831 getTypeInfo(getPointerDiffType()); 832 Width = PtrDiffInfo.first * ABI->getMemberPointerSize(MPT); 833 Align = PtrDiffInfo.second; 834 break; 835 } 836 case Type::Complex: { 837 // Complex types have the same alignment as their elements, but twice the 838 // size. 839 std::pair<uint64_t, unsigned> EltInfo = 840 getTypeInfo(cast<ComplexType>(T)->getElementType()); 841 Width = EltInfo.first*2; 842 Align = EltInfo.second; 843 break; 844 } 845 case Type::ObjCObject: 846 return getTypeInfo(cast<ObjCObjectType>(T)->getBaseType().getTypePtr()); 847 case Type::ObjCInterface: { 848 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 849 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 850 Width = Layout.getSize().getQuantity() * getCharWidth(); 851 Align = Layout.getAlignment(); 852 break; 853 } 854 case Type::Record: 855 case Type::Enum: { 856 const TagType *TT = cast<TagType>(T); 857 858 if (TT->getDecl()->isInvalidDecl()) { 859 Width = 1; 860 Align = 1; 861 break; 862 } 863 864 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 865 return getTypeInfo(ET->getDecl()->getIntegerType()); 866 867 const RecordType *RT = cast<RecordType>(TT); 868 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 869 Width = Layout.getSize().getQuantity() * getCharWidth(); 870 Align = Layout.getAlignment(); 871 break; 872 } 873 874 case Type::SubstTemplateTypeParm: 875 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 876 getReplacementType().getTypePtr()); 877 878 case Type::Paren: 879 return getTypeInfo(cast<ParenType>(T)->getInnerType().getTypePtr()); 880 881 case Type::Typedef: { 882 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 883 std::pair<uint64_t, unsigned> Info 884 = getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 885 Align = std::max(Typedef->getMaxAlignment(), Info.second); 886 Width = Info.first; 887 break; 888 } 889 890 case Type::TypeOfExpr: 891 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 892 .getTypePtr()); 893 894 case Type::TypeOf: 895 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 896 897 case Type::Decltype: 898 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 899 .getTypePtr()); 900 901 case Type::Elaborated: 902 return getTypeInfo(cast<ElaboratedType>(T)->getNamedType().getTypePtr()); 903 904 case Type::Attributed: 905 return getTypeInfo( 906 cast<AttributedType>(T)->getEquivalentType().getTypePtr()); 907 908 case Type::TemplateSpecialization: 909 assert(getCanonicalType(T) != T && 910 "Cannot request the size of a dependent type"); 911 // FIXME: this is likely to be wrong once we support template 912 // aliases, since a template alias could refer to a typedef that 913 // has an __aligned__ attribute on it. 914 return getTypeInfo(getCanonicalType(T)); 915 } 916 917 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 918 return std::make_pair(Width, Align); 919} 920 921/// toCharUnitsFromBits - Convert a size in bits to a size in characters. 922CharUnits ASTContext::toCharUnitsFromBits(int64_t BitSize) const { 923 return CharUnits::fromQuantity(BitSize / getCharWidth()); 924} 925 926/// getTypeSizeInChars - Return the size of the specified type, in characters. 927/// This method does not work on incomplete types. 928CharUnits ASTContext::getTypeSizeInChars(QualType T) const { 929 return toCharUnitsFromBits(getTypeSize(T)); 930} 931CharUnits ASTContext::getTypeSizeInChars(const Type *T) const { 932 return toCharUnitsFromBits(getTypeSize(T)); 933} 934 935/// getTypeAlignInChars - Return the ABI-specified alignment of a type, in 936/// characters. This method does not work on incomplete types. 937CharUnits ASTContext::getTypeAlignInChars(QualType T) const { 938 return toCharUnitsFromBits(getTypeAlign(T)); 939} 940CharUnits ASTContext::getTypeAlignInChars(const Type *T) const { 941 return toCharUnitsFromBits(getTypeAlign(T)); 942} 943 944/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 945/// type for the current target in bits. This can be different than the ABI 946/// alignment in cases where it is beneficial for performance to overalign 947/// a data type. 948unsigned ASTContext::getPreferredTypeAlign(const Type *T) const { 949 unsigned ABIAlign = getTypeAlign(T); 950 951 // Double and long long should be naturally aligned if possible. 952 if (const ComplexType* CT = T->getAs<ComplexType>()) 953 T = CT->getElementType().getTypePtr(); 954 if (T->isSpecificBuiltinType(BuiltinType::Double) || 955 T->isSpecificBuiltinType(BuiltinType::LongLong)) 956 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 957 958 return ABIAlign; 959} 960 961/// ShallowCollectObjCIvars - 962/// Collect all ivars, including those synthesized, in the current class. 963/// 964void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 965 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) const { 966 // FIXME. This need be removed but there are two many places which 967 // assume const-ness of ObjCInterfaceDecl 968 ObjCInterfaceDecl *IDecl = const_cast<ObjCInterfaceDecl *>(OI); 969 for (ObjCIvarDecl *Iv = IDecl->all_declared_ivar_begin(); Iv; 970 Iv= Iv->getNextIvar()) 971 Ivars.push_back(Iv); 972} 973 974/// DeepCollectObjCIvars - 975/// This routine first collects all declared, but not synthesized, ivars in 976/// super class and then collects all ivars, including those synthesized for 977/// current class. This routine is used for implementation of current class 978/// when all ivars, declared and synthesized are known. 979/// 980void ASTContext::DeepCollectObjCIvars(const ObjCInterfaceDecl *OI, 981 bool leafClass, 982 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) const { 983 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 984 DeepCollectObjCIvars(SuperClass, false, Ivars); 985 if (!leafClass) { 986 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 987 E = OI->ivar_end(); I != E; ++I) 988 Ivars.push_back(*I); 989 } 990 else 991 ShallowCollectObjCIvars(OI, Ivars); 992} 993 994/// CollectInheritedProtocols - Collect all protocols in current class and 995/// those inherited by it. 996void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 997 llvm::SmallPtrSet<ObjCProtocolDecl*, 8> &Protocols) { 998 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 999 // We can use protocol_iterator here instead of 1000 // all_referenced_protocol_iterator since we are walking all categories. 1001 for (ObjCInterfaceDecl::all_protocol_iterator P = OI->all_referenced_protocol_begin(), 1002 PE = OI->all_referenced_protocol_end(); P != PE; ++P) { 1003 ObjCProtocolDecl *Proto = (*P); 1004 Protocols.insert(Proto); 1005 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1006 PE = Proto->protocol_end(); P != PE; ++P) { 1007 Protocols.insert(*P); 1008 CollectInheritedProtocols(*P, Protocols); 1009 } 1010 } 1011 1012 // Categories of this Interface. 1013 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 1014 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 1015 CollectInheritedProtocols(CDeclChain, Protocols); 1016 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 1017 while (SD) { 1018 CollectInheritedProtocols(SD, Protocols); 1019 SD = SD->getSuperClass(); 1020 } 1021 } else if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1022 for (ObjCCategoryDecl::protocol_iterator P = OC->protocol_begin(), 1023 PE = OC->protocol_end(); P != PE; ++P) { 1024 ObjCProtocolDecl *Proto = (*P); 1025 Protocols.insert(Proto); 1026 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1027 PE = Proto->protocol_end(); P != PE; ++P) 1028 CollectInheritedProtocols(*P, Protocols); 1029 } 1030 } else if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 1031 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 1032 PE = OP->protocol_end(); P != PE; ++P) { 1033 ObjCProtocolDecl *Proto = (*P); 1034 Protocols.insert(Proto); 1035 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1036 PE = Proto->protocol_end(); P != PE; ++P) 1037 CollectInheritedProtocols(*P, Protocols); 1038 } 1039 } 1040} 1041 1042unsigned ASTContext::CountNonClassIvars(const ObjCInterfaceDecl *OI) const { 1043 unsigned count = 0; 1044 // Count ivars declared in class extension. 1045 for (const ObjCCategoryDecl *CDecl = OI->getFirstClassExtension(); CDecl; 1046 CDecl = CDecl->getNextClassExtension()) 1047 count += CDecl->ivar_size(); 1048 1049 // Count ivar defined in this class's implementation. This 1050 // includes synthesized ivars. 1051 if (ObjCImplementationDecl *ImplDecl = OI->getImplementation()) 1052 count += ImplDecl->ivar_size(); 1053 1054 return count; 1055} 1056 1057/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 1058ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 1059 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 1060 I = ObjCImpls.find(D); 1061 if (I != ObjCImpls.end()) 1062 return cast<ObjCImplementationDecl>(I->second); 1063 return 0; 1064} 1065/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 1066ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 1067 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 1068 I = ObjCImpls.find(D); 1069 if (I != ObjCImpls.end()) 1070 return cast<ObjCCategoryImplDecl>(I->second); 1071 return 0; 1072} 1073 1074/// \brief Set the implementation of ObjCInterfaceDecl. 1075void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 1076 ObjCImplementationDecl *ImplD) { 1077 assert(IFaceD && ImplD && "Passed null params"); 1078 ObjCImpls[IFaceD] = ImplD; 1079} 1080/// \brief Set the implementation of ObjCCategoryDecl. 1081void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 1082 ObjCCategoryImplDecl *ImplD) { 1083 assert(CatD && ImplD && "Passed null params"); 1084 ObjCImpls[CatD] = ImplD; 1085} 1086 1087/// \brief Get the copy initialization expression of VarDecl,or NULL if 1088/// none exists. 1089Expr *ASTContext::getBlockVarCopyInits(const VarDecl*VD) { 1090 assert(VD && "Passed null params"); 1091 assert(VD->hasAttr<BlocksAttr>() && 1092 "getBlockVarCopyInits - not __block var"); 1093 llvm::DenseMap<const VarDecl*, Expr*>::iterator 1094 I = BlockVarCopyInits.find(VD); 1095 return (I != BlockVarCopyInits.end()) ? cast<Expr>(I->second) : 0; 1096} 1097 1098/// \brief Set the copy inialization expression of a block var decl. 1099void ASTContext::setBlockVarCopyInits(VarDecl*VD, Expr* Init) { 1100 assert(VD && Init && "Passed null params"); 1101 assert(VD->hasAttr<BlocksAttr>() && 1102 "setBlockVarCopyInits - not __block var"); 1103 BlockVarCopyInits[VD] = Init; 1104} 1105 1106/// \brief Allocate an uninitialized TypeSourceInfo. 1107/// 1108/// The caller should initialize the memory held by TypeSourceInfo using 1109/// the TypeLoc wrappers. 1110/// 1111/// \param T the type that will be the basis for type source info. This type 1112/// should refer to how the declarator was written in source code, not to 1113/// what type semantic analysis resolved the declarator to. 1114TypeSourceInfo *ASTContext::CreateTypeSourceInfo(QualType T, 1115 unsigned DataSize) const { 1116 if (!DataSize) 1117 DataSize = TypeLoc::getFullDataSizeForType(T); 1118 else 1119 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 1120 "incorrect data size provided to CreateTypeSourceInfo!"); 1121 1122 TypeSourceInfo *TInfo = 1123 (TypeSourceInfo*)BumpAlloc.Allocate(sizeof(TypeSourceInfo) + DataSize, 8); 1124 new (TInfo) TypeSourceInfo(T); 1125 return TInfo; 1126} 1127 1128TypeSourceInfo *ASTContext::getTrivialTypeSourceInfo(QualType T, 1129 SourceLocation L) const { 1130 TypeSourceInfo *DI = CreateTypeSourceInfo(T); 1131 DI->getTypeLoc().initialize(const_cast<ASTContext &>(*this), L); 1132 return DI; 1133} 1134 1135const ASTRecordLayout & 1136ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) const { 1137 return getObjCLayout(D, 0); 1138} 1139 1140const ASTRecordLayout & 1141ASTContext::getASTObjCImplementationLayout( 1142 const ObjCImplementationDecl *D) const { 1143 return getObjCLayout(D->getClassInterface(), D); 1144} 1145 1146//===----------------------------------------------------------------------===// 1147// Type creation/memoization methods 1148//===----------------------------------------------------------------------===// 1149 1150QualType 1151ASTContext::getExtQualType(const Type *baseType, Qualifiers quals) const { 1152 unsigned fastQuals = quals.getFastQualifiers(); 1153 quals.removeFastQualifiers(); 1154 1155 // Check if we've already instantiated this type. 1156 llvm::FoldingSetNodeID ID; 1157 ExtQuals::Profile(ID, baseType, quals); 1158 void *insertPos = 0; 1159 if (ExtQuals *eq = ExtQualNodes.FindNodeOrInsertPos(ID, insertPos)) { 1160 assert(eq->getQualifiers() == quals); 1161 return QualType(eq, fastQuals); 1162 } 1163 1164 // If the base type is not canonical, make the appropriate canonical type. 1165 QualType canon; 1166 if (!baseType->isCanonicalUnqualified()) { 1167 SplitQualType canonSplit = baseType->getCanonicalTypeInternal().split(); 1168 canonSplit.second.addConsistentQualifiers(quals); 1169 canon = getExtQualType(canonSplit.first, canonSplit.second); 1170 1171 // Re-find the insert position. 1172 (void) ExtQualNodes.FindNodeOrInsertPos(ID, insertPos); 1173 } 1174 1175 ExtQuals *eq = new (*this, TypeAlignment) ExtQuals(baseType, canon, quals); 1176 ExtQualNodes.InsertNode(eq, insertPos); 1177 return QualType(eq, fastQuals); 1178} 1179 1180QualType 1181ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) const { 1182 QualType CanT = getCanonicalType(T); 1183 if (CanT.getAddressSpace() == AddressSpace) 1184 return T; 1185 1186 // If we are composing extended qualifiers together, merge together 1187 // into one ExtQuals node. 1188 QualifierCollector Quals; 1189 const Type *TypeNode = Quals.strip(T); 1190 1191 // If this type already has an address space specified, it cannot get 1192 // another one. 1193 assert(!Quals.hasAddressSpace() && 1194 "Type cannot be in multiple addr spaces!"); 1195 Quals.addAddressSpace(AddressSpace); 1196 1197 return getExtQualType(TypeNode, Quals); 1198} 1199 1200QualType ASTContext::getObjCGCQualType(QualType T, 1201 Qualifiers::GC GCAttr) const { 1202 QualType CanT = getCanonicalType(T); 1203 if (CanT.getObjCGCAttr() == GCAttr) 1204 return T; 1205 1206 if (const PointerType *ptr = T->getAs<PointerType>()) { 1207 QualType Pointee = ptr->getPointeeType(); 1208 if (Pointee->isAnyPointerType()) { 1209 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1210 return getPointerType(ResultType); 1211 } 1212 } 1213 1214 // If we are composing extended qualifiers together, merge together 1215 // into one ExtQuals node. 1216 QualifierCollector Quals; 1217 const Type *TypeNode = Quals.strip(T); 1218 1219 // If this type already has an ObjCGC specified, it cannot get 1220 // another one. 1221 assert(!Quals.hasObjCGCAttr() && 1222 "Type cannot have multiple ObjCGCs!"); 1223 Quals.addObjCGCAttr(GCAttr); 1224 1225 return getExtQualType(TypeNode, Quals); 1226} 1227 1228const FunctionType *ASTContext::adjustFunctionType(const FunctionType *T, 1229 FunctionType::ExtInfo Info) { 1230 if (T->getExtInfo() == Info) 1231 return T; 1232 1233 QualType Result; 1234 if (const FunctionNoProtoType *FNPT = dyn_cast<FunctionNoProtoType>(T)) { 1235 Result = getFunctionNoProtoType(FNPT->getResultType(), Info); 1236 } else { 1237 const FunctionProtoType *FPT = cast<FunctionProtoType>(T); 1238 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 1239 EPI.ExtInfo = Info; 1240 Result = getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 1241 FPT->getNumArgs(), EPI); 1242 } 1243 1244 return cast<FunctionType>(Result.getTypePtr()); 1245} 1246 1247/// getComplexType - Return the uniqued reference to the type for a complex 1248/// number with the specified element type. 1249QualType ASTContext::getComplexType(QualType T) const { 1250 // Unique pointers, to guarantee there is only one pointer of a particular 1251 // structure. 1252 llvm::FoldingSetNodeID ID; 1253 ComplexType::Profile(ID, T); 1254 1255 void *InsertPos = 0; 1256 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1257 return QualType(CT, 0); 1258 1259 // If the pointee type isn't canonical, this won't be a canonical type either, 1260 // so fill in the canonical type field. 1261 QualType Canonical; 1262 if (!T.isCanonical()) { 1263 Canonical = getComplexType(getCanonicalType(T)); 1264 1265 // Get the new insert position for the node we care about. 1266 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1267 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1268 } 1269 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1270 Types.push_back(New); 1271 ComplexTypes.InsertNode(New, InsertPos); 1272 return QualType(New, 0); 1273} 1274 1275/// getPointerType - Return the uniqued reference to the type for a pointer to 1276/// the specified type. 1277QualType ASTContext::getPointerType(QualType T) const { 1278 // Unique pointers, to guarantee there is only one pointer of a particular 1279 // structure. 1280 llvm::FoldingSetNodeID ID; 1281 PointerType::Profile(ID, T); 1282 1283 void *InsertPos = 0; 1284 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1285 return QualType(PT, 0); 1286 1287 // If the pointee type isn't canonical, this won't be a canonical type either, 1288 // so fill in the canonical type field. 1289 QualType Canonical; 1290 if (!T.isCanonical()) { 1291 Canonical = getPointerType(getCanonicalType(T)); 1292 1293 // Get the new insert position for the node we care about. 1294 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1295 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1296 } 1297 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1298 Types.push_back(New); 1299 PointerTypes.InsertNode(New, InsertPos); 1300 return QualType(New, 0); 1301} 1302 1303/// getBlockPointerType - Return the uniqued reference to the type for 1304/// a pointer to the specified block. 1305QualType ASTContext::getBlockPointerType(QualType T) const { 1306 assert(T->isFunctionType() && "block of function types only"); 1307 // Unique pointers, to guarantee there is only one block of a particular 1308 // structure. 1309 llvm::FoldingSetNodeID ID; 1310 BlockPointerType::Profile(ID, T); 1311 1312 void *InsertPos = 0; 1313 if (BlockPointerType *PT = 1314 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1315 return QualType(PT, 0); 1316 1317 // If the block pointee type isn't canonical, this won't be a canonical 1318 // type either so fill in the canonical type field. 1319 QualType Canonical; 1320 if (!T.isCanonical()) { 1321 Canonical = getBlockPointerType(getCanonicalType(T)); 1322 1323 // Get the new insert position for the node we care about. 1324 BlockPointerType *NewIP = 1325 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1326 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1327 } 1328 BlockPointerType *New 1329 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1330 Types.push_back(New); 1331 BlockPointerTypes.InsertNode(New, InsertPos); 1332 return QualType(New, 0); 1333} 1334 1335/// getLValueReferenceType - Return the uniqued reference to the type for an 1336/// lvalue reference to the specified type. 1337QualType 1338ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) const { 1339 // Unique pointers, to guarantee there is only one pointer of a particular 1340 // structure. 1341 llvm::FoldingSetNodeID ID; 1342 ReferenceType::Profile(ID, T, SpelledAsLValue); 1343 1344 void *InsertPos = 0; 1345 if (LValueReferenceType *RT = 1346 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1347 return QualType(RT, 0); 1348 1349 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1350 1351 // If the referencee type isn't canonical, this won't be a canonical type 1352 // either, so fill in the canonical type field. 1353 QualType Canonical; 1354 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1355 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1356 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1357 1358 // Get the new insert position for the node we care about. 1359 LValueReferenceType *NewIP = 1360 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1361 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1362 } 1363 1364 LValueReferenceType *New 1365 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1366 SpelledAsLValue); 1367 Types.push_back(New); 1368 LValueReferenceTypes.InsertNode(New, InsertPos); 1369 1370 return QualType(New, 0); 1371} 1372 1373/// getRValueReferenceType - Return the uniqued reference to the type for an 1374/// rvalue reference to the specified type. 1375QualType ASTContext::getRValueReferenceType(QualType T) const { 1376 // Unique pointers, to guarantee there is only one pointer of a particular 1377 // structure. 1378 llvm::FoldingSetNodeID ID; 1379 ReferenceType::Profile(ID, T, false); 1380 1381 void *InsertPos = 0; 1382 if (RValueReferenceType *RT = 1383 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1384 return QualType(RT, 0); 1385 1386 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1387 1388 // If the referencee type isn't canonical, this won't be a canonical type 1389 // either, so fill in the canonical type field. 1390 QualType Canonical; 1391 if (InnerRef || !T.isCanonical()) { 1392 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1393 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1394 1395 // Get the new insert position for the node we care about. 1396 RValueReferenceType *NewIP = 1397 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1398 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1399 } 1400 1401 RValueReferenceType *New 1402 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1403 Types.push_back(New); 1404 RValueReferenceTypes.InsertNode(New, InsertPos); 1405 return QualType(New, 0); 1406} 1407 1408/// getMemberPointerType - Return the uniqued reference to the type for a 1409/// member pointer to the specified type, in the specified class. 1410QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) const { 1411 // Unique pointers, to guarantee there is only one pointer of a particular 1412 // structure. 1413 llvm::FoldingSetNodeID ID; 1414 MemberPointerType::Profile(ID, T, Cls); 1415 1416 void *InsertPos = 0; 1417 if (MemberPointerType *PT = 1418 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1419 return QualType(PT, 0); 1420 1421 // If the pointee or class type isn't canonical, this won't be a canonical 1422 // type either, so fill in the canonical type field. 1423 QualType Canonical; 1424 if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) { 1425 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1426 1427 // Get the new insert position for the node we care about. 1428 MemberPointerType *NewIP = 1429 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1430 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1431 } 1432 MemberPointerType *New 1433 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1434 Types.push_back(New); 1435 MemberPointerTypes.InsertNode(New, InsertPos); 1436 return QualType(New, 0); 1437} 1438 1439/// getConstantArrayType - Return the unique reference to the type for an 1440/// array of the specified element type. 1441QualType ASTContext::getConstantArrayType(QualType EltTy, 1442 const llvm::APInt &ArySizeIn, 1443 ArrayType::ArraySizeModifier ASM, 1444 unsigned IndexTypeQuals) const { 1445 assert((EltTy->isDependentType() || 1446 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1447 "Constant array of VLAs is illegal!"); 1448 1449 // Convert the array size into a canonical width matching the pointer size for 1450 // the target. 1451 llvm::APInt ArySize(ArySizeIn); 1452 ArySize = 1453 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1454 1455 llvm::FoldingSetNodeID ID; 1456 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, IndexTypeQuals); 1457 1458 void *InsertPos = 0; 1459 if (ConstantArrayType *ATP = 1460 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1461 return QualType(ATP, 0); 1462 1463 // If the element type isn't canonical or has qualifiers, this won't 1464 // be a canonical type either, so fill in the canonical type field. 1465 QualType Canon; 1466 if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) { 1467 SplitQualType canonSplit = getCanonicalType(EltTy).split(); 1468 Canon = getConstantArrayType(QualType(canonSplit.first, 0), ArySize, 1469 ASM, IndexTypeQuals); 1470 Canon = getQualifiedType(Canon, canonSplit.second); 1471 1472 // Get the new insert position for the node we care about. 1473 ConstantArrayType *NewIP = 1474 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1475 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1476 } 1477 1478 ConstantArrayType *New = new(*this,TypeAlignment) 1479 ConstantArrayType(EltTy, Canon, ArySize, ASM, IndexTypeQuals); 1480 ConstantArrayTypes.InsertNode(New, InsertPos); 1481 Types.push_back(New); 1482 return QualType(New, 0); 1483} 1484 1485/// getVariableArrayDecayedType - Turns the given type, which may be 1486/// variably-modified, into the corresponding type with all the known 1487/// sizes replaced with [*]. 1488QualType ASTContext::getVariableArrayDecayedType(QualType type) const { 1489 // Vastly most common case. 1490 if (!type->isVariablyModifiedType()) return type; 1491 1492 QualType result; 1493 1494 SplitQualType split = type.getSplitDesugaredType(); 1495 const Type *ty = split.first; 1496 switch (ty->getTypeClass()) { 1497#define TYPE(Class, Base) 1498#define ABSTRACT_TYPE(Class, Base) 1499#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 1500#include "clang/AST/TypeNodes.def" 1501 llvm_unreachable("didn't desugar past all non-canonical types?"); 1502 1503 // These types should never be variably-modified. 1504 case Type::Builtin: 1505 case Type::Complex: 1506 case Type::Vector: 1507 case Type::ExtVector: 1508 case Type::DependentSizedExtVector: 1509 case Type::ObjCObject: 1510 case Type::ObjCInterface: 1511 case Type::ObjCObjectPointer: 1512 case Type::Record: 1513 case Type::Enum: 1514 case Type::UnresolvedUsing: 1515 case Type::TypeOfExpr: 1516 case Type::TypeOf: 1517 case Type::Decltype: 1518 case Type::DependentName: 1519 case Type::InjectedClassName: 1520 case Type::TemplateSpecialization: 1521 case Type::DependentTemplateSpecialization: 1522 case Type::TemplateTypeParm: 1523 case Type::SubstTemplateTypeParmPack: 1524 case Type::PackExpansion: 1525 llvm_unreachable("type should never be variably-modified"); 1526 1527 // These types can be variably-modified but should never need to 1528 // further decay. 1529 case Type::FunctionNoProto: 1530 case Type::FunctionProto: 1531 case Type::BlockPointer: 1532 case Type::MemberPointer: 1533 return type; 1534 1535 // These types can be variably-modified. All these modifications 1536 // preserve structure except as noted by comments. 1537 // TODO: if we ever care about optimizing VLAs, there are no-op 1538 // optimizations available here. 1539 case Type::Pointer: 1540 result = getPointerType(getVariableArrayDecayedType( 1541 cast<PointerType>(ty)->getPointeeType())); 1542 break; 1543 1544 case Type::LValueReference: { 1545 const LValueReferenceType *lv = cast<LValueReferenceType>(ty); 1546 result = getLValueReferenceType( 1547 getVariableArrayDecayedType(lv->getPointeeType()), 1548 lv->isSpelledAsLValue()); 1549 break; 1550 } 1551 1552 case Type::RValueReference: { 1553 const RValueReferenceType *lv = cast<RValueReferenceType>(ty); 1554 result = getRValueReferenceType( 1555 getVariableArrayDecayedType(lv->getPointeeType())); 1556 break; 1557 } 1558 1559 case Type::ConstantArray: { 1560 const ConstantArrayType *cat = cast<ConstantArrayType>(ty); 1561 result = getConstantArrayType( 1562 getVariableArrayDecayedType(cat->getElementType()), 1563 cat->getSize(), 1564 cat->getSizeModifier(), 1565 cat->getIndexTypeCVRQualifiers()); 1566 break; 1567 } 1568 1569 case Type::DependentSizedArray: { 1570 const DependentSizedArrayType *dat = cast<DependentSizedArrayType>(ty); 1571 result = getDependentSizedArrayType( 1572 getVariableArrayDecayedType(dat->getElementType()), 1573 dat->getSizeExpr(), 1574 dat->getSizeModifier(), 1575 dat->getIndexTypeCVRQualifiers(), 1576 dat->getBracketsRange()); 1577 break; 1578 } 1579 1580 // Turn incomplete types into [*] types. 1581 case Type::IncompleteArray: { 1582 const IncompleteArrayType *iat = cast<IncompleteArrayType>(ty); 1583 result = getVariableArrayType( 1584 getVariableArrayDecayedType(iat->getElementType()), 1585 /*size*/ 0, 1586 ArrayType::Normal, 1587 iat->getIndexTypeCVRQualifiers(), 1588 SourceRange()); 1589 break; 1590 } 1591 1592 // Turn VLA types into [*] types. 1593 case Type::VariableArray: { 1594 const VariableArrayType *vat = cast<VariableArrayType>(ty); 1595 result = getVariableArrayType( 1596 getVariableArrayDecayedType(vat->getElementType()), 1597 /*size*/ 0, 1598 ArrayType::Star, 1599 vat->getIndexTypeCVRQualifiers(), 1600 vat->getBracketsRange()); 1601 break; 1602 } 1603 } 1604 1605 // Apply the top-level qualifiers from the original. 1606 return getQualifiedType(result, split.second); 1607} 1608 1609/// getVariableArrayType - Returns a non-unique reference to the type for a 1610/// variable array of the specified element type. 1611QualType ASTContext::getVariableArrayType(QualType EltTy, 1612 Expr *NumElts, 1613 ArrayType::ArraySizeModifier ASM, 1614 unsigned IndexTypeQuals, 1615 SourceRange Brackets) const { 1616 // Since we don't unique expressions, it isn't possible to unique VLA's 1617 // that have an expression provided for their size. 1618 QualType Canon; 1619 1620 // Be sure to pull qualifiers off the element type. 1621 if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) { 1622 SplitQualType canonSplit = getCanonicalType(EltTy).split(); 1623 Canon = getVariableArrayType(QualType(canonSplit.first, 0), NumElts, ASM, 1624 IndexTypeQuals, Brackets); 1625 Canon = getQualifiedType(Canon, canonSplit.second); 1626 } 1627 1628 VariableArrayType *New = new(*this, TypeAlignment) 1629 VariableArrayType(EltTy, Canon, NumElts, ASM, IndexTypeQuals, Brackets); 1630 1631 VariableArrayTypes.push_back(New); 1632 Types.push_back(New); 1633 return QualType(New, 0); 1634} 1635 1636/// getDependentSizedArrayType - Returns a non-unique reference to 1637/// the type for a dependently-sized array of the specified element 1638/// type. 1639QualType ASTContext::getDependentSizedArrayType(QualType elementType, 1640 Expr *numElements, 1641 ArrayType::ArraySizeModifier ASM, 1642 unsigned elementTypeQuals, 1643 SourceRange brackets) const { 1644 assert((!numElements || numElements->isTypeDependent() || 1645 numElements->isValueDependent()) && 1646 "Size must be type- or value-dependent!"); 1647 1648 // Dependently-sized array types that do not have a specified number 1649 // of elements will have their sizes deduced from a dependent 1650 // initializer. We do no canonicalization here at all, which is okay 1651 // because they can't be used in most locations. 1652 if (!numElements) { 1653 DependentSizedArrayType *newType 1654 = new (*this, TypeAlignment) 1655 DependentSizedArrayType(*this, elementType, QualType(), 1656 numElements, ASM, elementTypeQuals, 1657 brackets); 1658 Types.push_back(newType); 1659 return QualType(newType, 0); 1660 } 1661 1662 // Otherwise, we actually build a new type every time, but we 1663 // also build a canonical type. 1664 1665 SplitQualType canonElementType = getCanonicalType(elementType).split(); 1666 1667 void *insertPos = 0; 1668 llvm::FoldingSetNodeID ID; 1669 DependentSizedArrayType::Profile(ID, *this, 1670 QualType(canonElementType.first, 0), 1671 ASM, elementTypeQuals, numElements); 1672 1673 // Look for an existing type with these properties. 1674 DependentSizedArrayType *canonTy = 1675 DependentSizedArrayTypes.FindNodeOrInsertPos(ID, insertPos); 1676 1677 // If we don't have one, build one. 1678 if (!canonTy) { 1679 canonTy = new (*this, TypeAlignment) 1680 DependentSizedArrayType(*this, QualType(canonElementType.first, 0), 1681 QualType(), numElements, ASM, elementTypeQuals, 1682 brackets); 1683 DependentSizedArrayTypes.InsertNode(canonTy, insertPos); 1684 Types.push_back(canonTy); 1685 } 1686 1687 // Apply qualifiers from the element type to the array. 1688 QualType canon = getQualifiedType(QualType(canonTy,0), 1689 canonElementType.second); 1690 1691 // If we didn't need extra canonicalization for the element type, 1692 // then just use that as our result. 1693 if (QualType(canonElementType.first, 0) == elementType) 1694 return canon; 1695 1696 // Otherwise, we need to build a type which follows the spelling 1697 // of the element type. 1698 DependentSizedArrayType *sugaredType 1699 = new (*this, TypeAlignment) 1700 DependentSizedArrayType(*this, elementType, canon, numElements, 1701 ASM, elementTypeQuals, brackets); 1702 Types.push_back(sugaredType); 1703 return QualType(sugaredType, 0); 1704} 1705 1706QualType ASTContext::getIncompleteArrayType(QualType elementType, 1707 ArrayType::ArraySizeModifier ASM, 1708 unsigned elementTypeQuals) const { 1709 llvm::FoldingSetNodeID ID; 1710 IncompleteArrayType::Profile(ID, elementType, ASM, elementTypeQuals); 1711 1712 void *insertPos = 0; 1713 if (IncompleteArrayType *iat = 1714 IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos)) 1715 return QualType(iat, 0); 1716 1717 // If the element type isn't canonical, this won't be a canonical type 1718 // either, so fill in the canonical type field. We also have to pull 1719 // qualifiers off the element type. 1720 QualType canon; 1721 1722 if (!elementType.isCanonical() || elementType.hasLocalQualifiers()) { 1723 SplitQualType canonSplit = getCanonicalType(elementType).split(); 1724 canon = getIncompleteArrayType(QualType(canonSplit.first, 0), 1725 ASM, elementTypeQuals); 1726 canon = getQualifiedType(canon, canonSplit.second); 1727 1728 // Get the new insert position for the node we care about. 1729 IncompleteArrayType *existing = 1730 IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos); 1731 assert(!existing && "Shouldn't be in the map!"); (void) existing; 1732 } 1733 1734 IncompleteArrayType *newType = new (*this, TypeAlignment) 1735 IncompleteArrayType(elementType, canon, ASM, elementTypeQuals); 1736 1737 IncompleteArrayTypes.InsertNode(newType, insertPos); 1738 Types.push_back(newType); 1739 return QualType(newType, 0); 1740} 1741 1742/// getVectorType - Return the unique reference to a vector type of 1743/// the specified element type and size. VectorType must be a built-in type. 1744QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts, 1745 VectorType::VectorKind VecKind) const { 1746 assert(vecType->isBuiltinType()); 1747 1748 // Check if we've already instantiated a vector of this type. 1749 llvm::FoldingSetNodeID ID; 1750 VectorType::Profile(ID, vecType, NumElts, Type::Vector, VecKind); 1751 1752 void *InsertPos = 0; 1753 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1754 return QualType(VTP, 0); 1755 1756 // If the element type isn't canonical, this won't be a canonical type either, 1757 // so fill in the canonical type field. 1758 QualType Canonical; 1759 if (!vecType.isCanonical()) { 1760 Canonical = getVectorType(getCanonicalType(vecType), NumElts, VecKind); 1761 1762 // Get the new insert position for the node we care about. 1763 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1764 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1765 } 1766 VectorType *New = new (*this, TypeAlignment) 1767 VectorType(vecType, NumElts, Canonical, VecKind); 1768 VectorTypes.InsertNode(New, InsertPos); 1769 Types.push_back(New); 1770 return QualType(New, 0); 1771} 1772 1773/// getExtVectorType - Return the unique reference to an extended vector type of 1774/// the specified element type and size. VectorType must be a built-in type. 1775QualType 1776ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) const { 1777 assert(vecType->isBuiltinType()); 1778 1779 // Check if we've already instantiated a vector of this type. 1780 llvm::FoldingSetNodeID ID; 1781 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector, 1782 VectorType::GenericVector); 1783 void *InsertPos = 0; 1784 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1785 return QualType(VTP, 0); 1786 1787 // If the element type isn't canonical, this won't be a canonical type either, 1788 // so fill in the canonical type field. 1789 QualType Canonical; 1790 if (!vecType.isCanonical()) { 1791 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1792 1793 // Get the new insert position for the node we care about. 1794 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1795 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1796 } 1797 ExtVectorType *New = new (*this, TypeAlignment) 1798 ExtVectorType(vecType, NumElts, Canonical); 1799 VectorTypes.InsertNode(New, InsertPos); 1800 Types.push_back(New); 1801 return QualType(New, 0); 1802} 1803 1804QualType 1805ASTContext::getDependentSizedExtVectorType(QualType vecType, 1806 Expr *SizeExpr, 1807 SourceLocation AttrLoc) const { 1808 llvm::FoldingSetNodeID ID; 1809 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1810 SizeExpr); 1811 1812 void *InsertPos = 0; 1813 DependentSizedExtVectorType *Canon 1814 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1815 DependentSizedExtVectorType *New; 1816 if (Canon) { 1817 // We already have a canonical version of this array type; use it as 1818 // the canonical type for a newly-built type. 1819 New = new (*this, TypeAlignment) 1820 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1821 SizeExpr, AttrLoc); 1822 } else { 1823 QualType CanonVecTy = getCanonicalType(vecType); 1824 if (CanonVecTy == vecType) { 1825 New = new (*this, TypeAlignment) 1826 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1827 AttrLoc); 1828 1829 DependentSizedExtVectorType *CanonCheck 1830 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1831 assert(!CanonCheck && "Dependent-sized ext_vector canonical type broken"); 1832 (void)CanonCheck; 1833 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1834 } else { 1835 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1836 SourceLocation()); 1837 New = new (*this, TypeAlignment) 1838 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1839 } 1840 } 1841 1842 Types.push_back(New); 1843 return QualType(New, 0); 1844} 1845 1846/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1847/// 1848QualType 1849ASTContext::getFunctionNoProtoType(QualType ResultTy, 1850 const FunctionType::ExtInfo &Info) const { 1851 const CallingConv CallConv = Info.getCC(); 1852 // Unique functions, to guarantee there is only one function of a particular 1853 // structure. 1854 llvm::FoldingSetNodeID ID; 1855 FunctionNoProtoType::Profile(ID, ResultTy, Info); 1856 1857 void *InsertPos = 0; 1858 if (FunctionNoProtoType *FT = 1859 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1860 return QualType(FT, 0); 1861 1862 QualType Canonical; 1863 if (!ResultTy.isCanonical() || 1864 getCanonicalCallConv(CallConv) != CallConv) { 1865 Canonical = 1866 getFunctionNoProtoType(getCanonicalType(ResultTy), 1867 Info.withCallingConv(getCanonicalCallConv(CallConv))); 1868 1869 // Get the new insert position for the node we care about. 1870 FunctionNoProtoType *NewIP = 1871 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1872 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1873 } 1874 1875 FunctionNoProtoType *New = new (*this, TypeAlignment) 1876 FunctionNoProtoType(ResultTy, Canonical, Info); 1877 Types.push_back(New); 1878 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1879 return QualType(New, 0); 1880} 1881 1882/// getFunctionType - Return a normal function type with a typed argument 1883/// list. isVariadic indicates whether the argument list includes '...'. 1884QualType 1885ASTContext::getFunctionType(QualType ResultTy, 1886 const QualType *ArgArray, unsigned NumArgs, 1887 const FunctionProtoType::ExtProtoInfo &EPI) const { 1888 // Unique functions, to guarantee there is only one function of a particular 1889 // structure. 1890 llvm::FoldingSetNodeID ID; 1891 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, EPI); 1892 1893 void *InsertPos = 0; 1894 if (FunctionProtoType *FTP = 1895 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1896 return QualType(FTP, 0); 1897 1898 // Determine whether the type being created is already canonical or not. 1899 bool isCanonical = !EPI.HasExceptionSpec && ResultTy.isCanonical(); 1900 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1901 if (!ArgArray[i].isCanonicalAsParam()) 1902 isCanonical = false; 1903 1904 const CallingConv CallConv = EPI.ExtInfo.getCC(); 1905 1906 // If this type isn't canonical, get the canonical version of it. 1907 // The exception spec is not part of the canonical type. 1908 QualType Canonical; 1909 if (!isCanonical || getCanonicalCallConv(CallConv) != CallConv) { 1910 llvm::SmallVector<QualType, 16> CanonicalArgs; 1911 CanonicalArgs.reserve(NumArgs); 1912 for (unsigned i = 0; i != NumArgs; ++i) 1913 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1914 1915 FunctionProtoType::ExtProtoInfo CanonicalEPI = EPI; 1916 if (CanonicalEPI.HasExceptionSpec) { 1917 CanonicalEPI.HasExceptionSpec = false; 1918 CanonicalEPI.HasAnyExceptionSpec = false; 1919 CanonicalEPI.NumExceptions = 0; 1920 } 1921 CanonicalEPI.ExtInfo 1922 = CanonicalEPI.ExtInfo.withCallingConv(getCanonicalCallConv(CallConv)); 1923 1924 Canonical = getFunctionType(getCanonicalType(ResultTy), 1925 CanonicalArgs.data(), NumArgs, 1926 CanonicalEPI); 1927 1928 // Get the new insert position for the node we care about. 1929 FunctionProtoType *NewIP = 1930 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1931 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1932 } 1933 1934 // FunctionProtoType objects are allocated with extra bytes after them 1935 // for two variable size arrays (for parameter and exception types) at the 1936 // end of them. 1937 size_t Size = sizeof(FunctionProtoType) + 1938 NumArgs * sizeof(QualType) + 1939 EPI.NumExceptions * sizeof(QualType); 1940 FunctionProtoType *FTP = (FunctionProtoType*) Allocate(Size, TypeAlignment); 1941 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, Canonical, EPI); 1942 Types.push_back(FTP); 1943 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1944 return QualType(FTP, 0); 1945} 1946 1947#ifndef NDEBUG 1948static bool NeedsInjectedClassNameType(const RecordDecl *D) { 1949 if (!isa<CXXRecordDecl>(D)) return false; 1950 const CXXRecordDecl *RD = cast<CXXRecordDecl>(D); 1951 if (isa<ClassTemplatePartialSpecializationDecl>(RD)) 1952 return true; 1953 if (RD->getDescribedClassTemplate() && 1954 !isa<ClassTemplateSpecializationDecl>(RD)) 1955 return true; 1956 return false; 1957} 1958#endif 1959 1960/// getInjectedClassNameType - Return the unique reference to the 1961/// injected class name type for the specified templated declaration. 1962QualType ASTContext::getInjectedClassNameType(CXXRecordDecl *Decl, 1963 QualType TST) const { 1964 assert(NeedsInjectedClassNameType(Decl)); 1965 if (Decl->TypeForDecl) { 1966 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1967 } else if (CXXRecordDecl *PrevDecl = Decl->getPreviousDeclaration()) { 1968 assert(PrevDecl->TypeForDecl && "previous declaration has no type"); 1969 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1970 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1971 } else { 1972 Type *newType = 1973 new (*this, TypeAlignment) InjectedClassNameType(Decl, TST); 1974 Decl->TypeForDecl = newType; 1975 Types.push_back(newType); 1976 } 1977 return QualType(Decl->TypeForDecl, 0); 1978} 1979 1980/// getTypeDeclType - Return the unique reference to the type for the 1981/// specified type declaration. 1982QualType ASTContext::getTypeDeclTypeSlow(const TypeDecl *Decl) const { 1983 assert(Decl && "Passed null for Decl param"); 1984 assert(!Decl->TypeForDecl && "TypeForDecl present in slow case"); 1985 1986 if (const TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1987 return getTypedefType(Typedef); 1988 1989 assert(!isa<TemplateTypeParmDecl>(Decl) && 1990 "Template type parameter types are always available."); 1991 1992 if (const RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1993 assert(!Record->getPreviousDeclaration() && 1994 "struct/union has previous declaration"); 1995 assert(!NeedsInjectedClassNameType(Record)); 1996 return getRecordType(Record); 1997 } else if (const EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1998 assert(!Enum->getPreviousDeclaration() && 1999 "enum has previous declaration"); 2000 return getEnumType(Enum); 2001 } else if (const UnresolvedUsingTypenameDecl *Using = 2002 dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) { 2003 Type *newType = new (*this, TypeAlignment) UnresolvedUsingType(Using); 2004 Decl->TypeForDecl = newType; 2005 Types.push_back(newType); 2006 } else 2007 llvm_unreachable("TypeDecl without a type?"); 2008 2009 return QualType(Decl->TypeForDecl, 0); 2010} 2011 2012/// getTypedefType - Return the unique reference to the type for the 2013/// specified typename decl. 2014QualType 2015ASTContext::getTypedefType(const TypedefDecl *Decl, QualType Canonical) const { 2016 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2017 2018 if (Canonical.isNull()) 2019 Canonical = getCanonicalType(Decl->getUnderlyingType()); 2020 TypedefType *newType = new(*this, TypeAlignment) 2021 TypedefType(Type::Typedef, Decl, Canonical); 2022 Decl->TypeForDecl = newType; 2023 Types.push_back(newType); 2024 return QualType(newType, 0); 2025} 2026 2027QualType ASTContext::getRecordType(const RecordDecl *Decl) const { 2028 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2029 2030 if (const RecordDecl *PrevDecl = Decl->getPreviousDeclaration()) 2031 if (PrevDecl->TypeForDecl) 2032 return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0); 2033 2034 RecordType *newType = new (*this, TypeAlignment) RecordType(Decl); 2035 Decl->TypeForDecl = newType; 2036 Types.push_back(newType); 2037 return QualType(newType, 0); 2038} 2039 2040QualType ASTContext::getEnumType(const EnumDecl *Decl) const { 2041 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2042 2043 if (const EnumDecl *PrevDecl = Decl->getPreviousDeclaration()) 2044 if (PrevDecl->TypeForDecl) 2045 return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0); 2046 2047 EnumType *newType = new (*this, TypeAlignment) EnumType(Decl); 2048 Decl->TypeForDecl = newType; 2049 Types.push_back(newType); 2050 return QualType(newType, 0); 2051} 2052 2053QualType ASTContext::getAttributedType(AttributedType::Kind attrKind, 2054 QualType modifiedType, 2055 QualType equivalentType) { 2056 llvm::FoldingSetNodeID id; 2057 AttributedType::Profile(id, attrKind, modifiedType, equivalentType); 2058 2059 void *insertPos = 0; 2060 AttributedType *type = AttributedTypes.FindNodeOrInsertPos(id, insertPos); 2061 if (type) return QualType(type, 0); 2062 2063 QualType canon = getCanonicalType(equivalentType); 2064 type = new (*this, TypeAlignment) 2065 AttributedType(canon, attrKind, modifiedType, equivalentType); 2066 2067 Types.push_back(type); 2068 AttributedTypes.InsertNode(type, insertPos); 2069 2070 return QualType(type, 0); 2071} 2072 2073 2074/// \brief Retrieve a substitution-result type. 2075QualType 2076ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 2077 QualType Replacement) const { 2078 assert(Replacement.isCanonical() 2079 && "replacement types must always be canonical"); 2080 2081 llvm::FoldingSetNodeID ID; 2082 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 2083 void *InsertPos = 0; 2084 SubstTemplateTypeParmType *SubstParm 2085 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2086 2087 if (!SubstParm) { 2088 SubstParm = new (*this, TypeAlignment) 2089 SubstTemplateTypeParmType(Parm, Replacement); 2090 Types.push_back(SubstParm); 2091 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 2092 } 2093 2094 return QualType(SubstParm, 0); 2095} 2096 2097/// \brief Retrieve a 2098QualType ASTContext::getSubstTemplateTypeParmPackType( 2099 const TemplateTypeParmType *Parm, 2100 const TemplateArgument &ArgPack) { 2101#ifndef NDEBUG 2102 for (TemplateArgument::pack_iterator P = ArgPack.pack_begin(), 2103 PEnd = ArgPack.pack_end(); 2104 P != PEnd; ++P) { 2105 assert(P->getKind() == TemplateArgument::Type &&"Pack contains a non-type"); 2106 assert(P->getAsType().isCanonical() && "Pack contains non-canonical type"); 2107 } 2108#endif 2109 2110 llvm::FoldingSetNodeID ID; 2111 SubstTemplateTypeParmPackType::Profile(ID, Parm, ArgPack); 2112 void *InsertPos = 0; 2113 if (SubstTemplateTypeParmPackType *SubstParm 2114 = SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos)) 2115 return QualType(SubstParm, 0); 2116 2117 QualType Canon; 2118 if (!Parm->isCanonicalUnqualified()) { 2119 Canon = getCanonicalType(QualType(Parm, 0)); 2120 Canon = getSubstTemplateTypeParmPackType(cast<TemplateTypeParmType>(Canon), 2121 ArgPack); 2122 SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos); 2123 } 2124 2125 SubstTemplateTypeParmPackType *SubstParm 2126 = new (*this, TypeAlignment) SubstTemplateTypeParmPackType(Parm, Canon, 2127 ArgPack); 2128 Types.push_back(SubstParm); 2129 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 2130 return QualType(SubstParm, 0); 2131} 2132 2133/// \brief Retrieve the template type parameter type for a template 2134/// parameter or parameter pack with the given depth, index, and (optionally) 2135/// name. 2136QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 2137 bool ParameterPack, 2138 IdentifierInfo *Name) const { 2139 llvm::FoldingSetNodeID ID; 2140 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 2141 void *InsertPos = 0; 2142 TemplateTypeParmType *TypeParm 2143 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2144 2145 if (TypeParm) 2146 return QualType(TypeParm, 0); 2147 2148 if (Name) { 2149 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 2150 TypeParm = new (*this, TypeAlignment) 2151 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 2152 2153 TemplateTypeParmType *TypeCheck 2154 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2155 assert(!TypeCheck && "Template type parameter canonical type broken"); 2156 (void)TypeCheck; 2157 } else 2158 TypeParm = new (*this, TypeAlignment) 2159 TemplateTypeParmType(Depth, Index, ParameterPack); 2160 2161 Types.push_back(TypeParm); 2162 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 2163 2164 return QualType(TypeParm, 0); 2165} 2166 2167TypeSourceInfo * 2168ASTContext::getTemplateSpecializationTypeInfo(TemplateName Name, 2169 SourceLocation NameLoc, 2170 const TemplateArgumentListInfo &Args, 2171 QualType CanonType) const { 2172 QualType TST = getTemplateSpecializationType(Name, Args, CanonType); 2173 2174 TypeSourceInfo *DI = CreateTypeSourceInfo(TST); 2175 TemplateSpecializationTypeLoc TL 2176 = cast<TemplateSpecializationTypeLoc>(DI->getTypeLoc()); 2177 TL.setTemplateNameLoc(NameLoc); 2178 TL.setLAngleLoc(Args.getLAngleLoc()); 2179 TL.setRAngleLoc(Args.getRAngleLoc()); 2180 for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i) 2181 TL.setArgLocInfo(i, Args[i].getLocInfo()); 2182 return DI; 2183} 2184 2185QualType 2186ASTContext::getTemplateSpecializationType(TemplateName Template, 2187 const TemplateArgumentListInfo &Args, 2188 QualType Canon) const { 2189 unsigned NumArgs = Args.size(); 2190 2191 llvm::SmallVector<TemplateArgument, 4> ArgVec; 2192 ArgVec.reserve(NumArgs); 2193 for (unsigned i = 0; i != NumArgs; ++i) 2194 ArgVec.push_back(Args[i].getArgument()); 2195 2196 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, 2197 Canon); 2198} 2199 2200QualType 2201ASTContext::getTemplateSpecializationType(TemplateName Template, 2202 const TemplateArgument *Args, 2203 unsigned NumArgs, 2204 QualType Canon) const { 2205 if (!Canon.isNull()) 2206 Canon = getCanonicalType(Canon); 2207 else 2208 Canon = getCanonicalTemplateSpecializationType(Template, Args, NumArgs); 2209 2210 // Allocate the (non-canonical) template specialization type, but don't 2211 // try to unique it: these types typically have location information that 2212 // we don't unique and don't want to lose. 2213 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 2214 sizeof(TemplateArgument) * NumArgs), 2215 TypeAlignment); 2216 TemplateSpecializationType *Spec 2217 = new (Mem) TemplateSpecializationType(Template, 2218 Args, NumArgs, 2219 Canon); 2220 2221 Types.push_back(Spec); 2222 return QualType(Spec, 0); 2223} 2224 2225QualType 2226ASTContext::getCanonicalTemplateSpecializationType(TemplateName Template, 2227 const TemplateArgument *Args, 2228 unsigned NumArgs) const { 2229 // Build the canonical template specialization type. 2230 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 2231 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 2232 CanonArgs.reserve(NumArgs); 2233 for (unsigned I = 0; I != NumArgs; ++I) 2234 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 2235 2236 // Determine whether this canonical template specialization type already 2237 // exists. 2238 llvm::FoldingSetNodeID ID; 2239 TemplateSpecializationType::Profile(ID, CanonTemplate, 2240 CanonArgs.data(), NumArgs, *this); 2241 2242 void *InsertPos = 0; 2243 TemplateSpecializationType *Spec 2244 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2245 2246 if (!Spec) { 2247 // Allocate a new canonical template specialization type. 2248 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 2249 sizeof(TemplateArgument) * NumArgs), 2250 TypeAlignment); 2251 Spec = new (Mem) TemplateSpecializationType(CanonTemplate, 2252 CanonArgs.data(), NumArgs, 2253 QualType()); 2254 Types.push_back(Spec); 2255 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 2256 } 2257 2258 assert(Spec->isDependentType() && 2259 "Non-dependent template-id type must have a canonical type"); 2260 return QualType(Spec, 0); 2261} 2262 2263QualType 2264ASTContext::getElaboratedType(ElaboratedTypeKeyword Keyword, 2265 NestedNameSpecifier *NNS, 2266 QualType NamedType) const { 2267 llvm::FoldingSetNodeID ID; 2268 ElaboratedType::Profile(ID, Keyword, NNS, NamedType); 2269 2270 void *InsertPos = 0; 2271 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2272 if (T) 2273 return QualType(T, 0); 2274 2275 QualType Canon = NamedType; 2276 if (!Canon.isCanonical()) { 2277 Canon = getCanonicalType(NamedType); 2278 ElaboratedType *CheckT = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2279 assert(!CheckT && "Elaborated canonical type broken"); 2280 (void)CheckT; 2281 } 2282 2283 T = new (*this) ElaboratedType(Keyword, NNS, NamedType, Canon); 2284 Types.push_back(T); 2285 ElaboratedTypes.InsertNode(T, InsertPos); 2286 return QualType(T, 0); 2287} 2288 2289QualType 2290ASTContext::getParenType(QualType InnerType) const { 2291 llvm::FoldingSetNodeID ID; 2292 ParenType::Profile(ID, InnerType); 2293 2294 void *InsertPos = 0; 2295 ParenType *T = ParenTypes.FindNodeOrInsertPos(ID, InsertPos); 2296 if (T) 2297 return QualType(T, 0); 2298 2299 QualType Canon = InnerType; 2300 if (!Canon.isCanonical()) { 2301 Canon = getCanonicalType(InnerType); 2302 ParenType *CheckT = ParenTypes.FindNodeOrInsertPos(ID, InsertPos); 2303 assert(!CheckT && "Paren canonical type broken"); 2304 (void)CheckT; 2305 } 2306 2307 T = new (*this) ParenType(InnerType, Canon); 2308 Types.push_back(T); 2309 ParenTypes.InsertNode(T, InsertPos); 2310 return QualType(T, 0); 2311} 2312 2313QualType ASTContext::getDependentNameType(ElaboratedTypeKeyword Keyword, 2314 NestedNameSpecifier *NNS, 2315 const IdentifierInfo *Name, 2316 QualType Canon) const { 2317 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 2318 2319 if (Canon.isNull()) { 2320 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2321 ElaboratedTypeKeyword CanonKeyword = Keyword; 2322 if (Keyword == ETK_None) 2323 CanonKeyword = ETK_Typename; 2324 2325 if (CanonNNS != NNS || CanonKeyword != Keyword) 2326 Canon = getDependentNameType(CanonKeyword, CanonNNS, Name); 2327 } 2328 2329 llvm::FoldingSetNodeID ID; 2330 DependentNameType::Profile(ID, Keyword, NNS, Name); 2331 2332 void *InsertPos = 0; 2333 DependentNameType *T 2334 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 2335 if (T) 2336 return QualType(T, 0); 2337 2338 T = new (*this) DependentNameType(Keyword, NNS, Name, Canon); 2339 Types.push_back(T); 2340 DependentNameTypes.InsertNode(T, InsertPos); 2341 return QualType(T, 0); 2342} 2343 2344QualType 2345ASTContext::getDependentTemplateSpecializationType( 2346 ElaboratedTypeKeyword Keyword, 2347 NestedNameSpecifier *NNS, 2348 const IdentifierInfo *Name, 2349 const TemplateArgumentListInfo &Args) const { 2350 // TODO: avoid this copy 2351 llvm::SmallVector<TemplateArgument, 16> ArgCopy; 2352 for (unsigned I = 0, E = Args.size(); I != E; ++I) 2353 ArgCopy.push_back(Args[I].getArgument()); 2354 return getDependentTemplateSpecializationType(Keyword, NNS, Name, 2355 ArgCopy.size(), 2356 ArgCopy.data()); 2357} 2358 2359QualType 2360ASTContext::getDependentTemplateSpecializationType( 2361 ElaboratedTypeKeyword Keyword, 2362 NestedNameSpecifier *NNS, 2363 const IdentifierInfo *Name, 2364 unsigned NumArgs, 2365 const TemplateArgument *Args) const { 2366 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 2367 2368 llvm::FoldingSetNodeID ID; 2369 DependentTemplateSpecializationType::Profile(ID, *this, Keyword, NNS, 2370 Name, NumArgs, Args); 2371 2372 void *InsertPos = 0; 2373 DependentTemplateSpecializationType *T 2374 = DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2375 if (T) 2376 return QualType(T, 0); 2377 2378 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2379 2380 ElaboratedTypeKeyword CanonKeyword = Keyword; 2381 if (Keyword == ETK_None) CanonKeyword = ETK_Typename; 2382 2383 bool AnyNonCanonArgs = false; 2384 llvm::SmallVector<TemplateArgument, 16> CanonArgs(NumArgs); 2385 for (unsigned I = 0; I != NumArgs; ++I) { 2386 CanonArgs[I] = getCanonicalTemplateArgument(Args[I]); 2387 if (!CanonArgs[I].structurallyEquals(Args[I])) 2388 AnyNonCanonArgs = true; 2389 } 2390 2391 QualType Canon; 2392 if (AnyNonCanonArgs || CanonNNS != NNS || CanonKeyword != Keyword) { 2393 Canon = getDependentTemplateSpecializationType(CanonKeyword, CanonNNS, 2394 Name, NumArgs, 2395 CanonArgs.data()); 2396 2397 // Find the insert position again. 2398 DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2399 } 2400 2401 void *Mem = Allocate((sizeof(DependentTemplateSpecializationType) + 2402 sizeof(TemplateArgument) * NumArgs), 2403 TypeAlignment); 2404 T = new (Mem) DependentTemplateSpecializationType(Keyword, NNS, 2405 Name, NumArgs, Args, Canon); 2406 Types.push_back(T); 2407 DependentTemplateSpecializationTypes.InsertNode(T, InsertPos); 2408 return QualType(T, 0); 2409} 2410 2411QualType ASTContext::getPackExpansionType(QualType Pattern, 2412 llvm::Optional<unsigned> NumExpansions) { 2413 llvm::FoldingSetNodeID ID; 2414 PackExpansionType::Profile(ID, Pattern, NumExpansions); 2415 2416 assert(Pattern->containsUnexpandedParameterPack() && 2417 "Pack expansions must expand one or more parameter packs"); 2418 void *InsertPos = 0; 2419 PackExpansionType *T 2420 = PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2421 if (T) 2422 return QualType(T, 0); 2423 2424 QualType Canon; 2425 if (!Pattern.isCanonical()) { 2426 Canon = getPackExpansionType(getCanonicalType(Pattern), NumExpansions); 2427 2428 // Find the insert position again. 2429 PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2430 } 2431 2432 T = new (*this) PackExpansionType(Pattern, Canon, NumExpansions); 2433 Types.push_back(T); 2434 PackExpansionTypes.InsertNode(T, InsertPos); 2435 return QualType(T, 0); 2436} 2437 2438/// CmpProtocolNames - Comparison predicate for sorting protocols 2439/// alphabetically. 2440static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 2441 const ObjCProtocolDecl *RHS) { 2442 return LHS->getDeclName() < RHS->getDeclName(); 2443} 2444 2445static bool areSortedAndUniqued(ObjCProtocolDecl * const *Protocols, 2446 unsigned NumProtocols) { 2447 if (NumProtocols == 0) return true; 2448 2449 for (unsigned i = 1; i != NumProtocols; ++i) 2450 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 2451 return false; 2452 return true; 2453} 2454 2455static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2456 unsigned &NumProtocols) { 2457 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2458 2459 // Sort protocols, keyed by name. 2460 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2461 2462 // Remove duplicates. 2463 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2464 NumProtocols = ProtocolsEnd-Protocols; 2465} 2466 2467QualType ASTContext::getObjCObjectType(QualType BaseType, 2468 ObjCProtocolDecl * const *Protocols, 2469 unsigned NumProtocols) const { 2470 // If the base type is an interface and there aren't any protocols 2471 // to add, then the interface type will do just fine. 2472 if (!NumProtocols && isa<ObjCInterfaceType>(BaseType)) 2473 return BaseType; 2474 2475 // Look in the folding set for an existing type. 2476 llvm::FoldingSetNodeID ID; 2477 ObjCObjectTypeImpl::Profile(ID, BaseType, Protocols, NumProtocols); 2478 void *InsertPos = 0; 2479 if (ObjCObjectType *QT = ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos)) 2480 return QualType(QT, 0); 2481 2482 // Build the canonical type, which has the canonical base type and 2483 // a sorted-and-uniqued list of protocols. 2484 QualType Canonical; 2485 bool ProtocolsSorted = areSortedAndUniqued(Protocols, NumProtocols); 2486 if (!ProtocolsSorted || !BaseType.isCanonical()) { 2487 if (!ProtocolsSorted) { 2488 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(Protocols, 2489 Protocols + NumProtocols); 2490 unsigned UniqueCount = NumProtocols; 2491 2492 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2493 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2494 &Sorted[0], UniqueCount); 2495 } else { 2496 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2497 Protocols, NumProtocols); 2498 } 2499 2500 // Regenerate InsertPos. 2501 ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos); 2502 } 2503 2504 unsigned Size = sizeof(ObjCObjectTypeImpl); 2505 Size += NumProtocols * sizeof(ObjCProtocolDecl *); 2506 void *Mem = Allocate(Size, TypeAlignment); 2507 ObjCObjectTypeImpl *T = 2508 new (Mem) ObjCObjectTypeImpl(Canonical, BaseType, Protocols, NumProtocols); 2509 2510 Types.push_back(T); 2511 ObjCObjectTypes.InsertNode(T, InsertPos); 2512 return QualType(T, 0); 2513} 2514 2515/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2516/// the given object type. 2517QualType ASTContext::getObjCObjectPointerType(QualType ObjectT) const { 2518 llvm::FoldingSetNodeID ID; 2519 ObjCObjectPointerType::Profile(ID, ObjectT); 2520 2521 void *InsertPos = 0; 2522 if (ObjCObjectPointerType *QT = 2523 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2524 return QualType(QT, 0); 2525 2526 // Find the canonical object type. 2527 QualType Canonical; 2528 if (!ObjectT.isCanonical()) { 2529 Canonical = getObjCObjectPointerType(getCanonicalType(ObjectT)); 2530 2531 // Regenerate InsertPos. 2532 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2533 } 2534 2535 // No match. 2536 void *Mem = Allocate(sizeof(ObjCObjectPointerType), TypeAlignment); 2537 ObjCObjectPointerType *QType = 2538 new (Mem) ObjCObjectPointerType(Canonical, ObjectT); 2539 2540 Types.push_back(QType); 2541 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2542 return QualType(QType, 0); 2543} 2544 2545/// getObjCInterfaceType - Return the unique reference to the type for the 2546/// specified ObjC interface decl. The list of protocols is optional. 2547QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) const { 2548 if (Decl->TypeForDecl) 2549 return QualType(Decl->TypeForDecl, 0); 2550 2551 // FIXME: redeclarations? 2552 void *Mem = Allocate(sizeof(ObjCInterfaceType), TypeAlignment); 2553 ObjCInterfaceType *T = new (Mem) ObjCInterfaceType(Decl); 2554 Decl->TypeForDecl = T; 2555 Types.push_back(T); 2556 return QualType(T, 0); 2557} 2558 2559/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2560/// TypeOfExprType AST's (since expression's are never shared). For example, 2561/// multiple declarations that refer to "typeof(x)" all contain different 2562/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2563/// on canonical type's (which are always unique). 2564QualType ASTContext::getTypeOfExprType(Expr *tofExpr) const { 2565 TypeOfExprType *toe; 2566 if (tofExpr->isTypeDependent()) { 2567 llvm::FoldingSetNodeID ID; 2568 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2569 2570 void *InsertPos = 0; 2571 DependentTypeOfExprType *Canon 2572 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2573 if (Canon) { 2574 // We already have a "canonical" version of an identical, dependent 2575 // typeof(expr) type. Use that as our canonical type. 2576 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2577 QualType((TypeOfExprType*)Canon, 0)); 2578 } 2579 else { 2580 // Build a new, canonical typeof(expr) type. 2581 Canon 2582 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2583 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2584 toe = Canon; 2585 } 2586 } else { 2587 QualType Canonical = getCanonicalType(tofExpr->getType()); 2588 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2589 } 2590 Types.push_back(toe); 2591 return QualType(toe, 0); 2592} 2593 2594/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2595/// TypeOfType AST's. The only motivation to unique these nodes would be 2596/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2597/// an issue. This doesn't effect the type checker, since it operates 2598/// on canonical type's (which are always unique). 2599QualType ASTContext::getTypeOfType(QualType tofType) const { 2600 QualType Canonical = getCanonicalType(tofType); 2601 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2602 Types.push_back(tot); 2603 return QualType(tot, 0); 2604} 2605 2606/// getDecltypeForExpr - Given an expr, will return the decltype for that 2607/// expression, according to the rules in C++0x [dcl.type.simple]p4 2608static QualType getDecltypeForExpr(const Expr *e, const ASTContext &Context) { 2609 if (e->isTypeDependent()) 2610 return Context.DependentTy; 2611 2612 // If e is an id expression or a class member access, decltype(e) is defined 2613 // as the type of the entity named by e. 2614 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2615 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2616 return VD->getType(); 2617 } 2618 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2619 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2620 return FD->getType(); 2621 } 2622 // If e is a function call or an invocation of an overloaded operator, 2623 // (parentheses around e are ignored), decltype(e) is defined as the 2624 // return type of that function. 2625 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2626 return CE->getCallReturnType(); 2627 2628 QualType T = e->getType(); 2629 2630 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2631 // defined as T&, otherwise decltype(e) is defined as T. 2632 if (e->isLValue()) 2633 T = Context.getLValueReferenceType(T); 2634 2635 return T; 2636} 2637 2638/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2639/// DecltypeType AST's. The only motivation to unique these nodes would be 2640/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2641/// an issue. This doesn't effect the type checker, since it operates 2642/// on canonical type's (which are always unique). 2643QualType ASTContext::getDecltypeType(Expr *e) const { 2644 DecltypeType *dt; 2645 if (e->isTypeDependent()) { 2646 llvm::FoldingSetNodeID ID; 2647 DependentDecltypeType::Profile(ID, *this, e); 2648 2649 void *InsertPos = 0; 2650 DependentDecltypeType *Canon 2651 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2652 if (Canon) { 2653 // We already have a "canonical" version of an equivalent, dependent 2654 // decltype type. Use that as our canonical type. 2655 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2656 QualType((DecltypeType*)Canon, 0)); 2657 } 2658 else { 2659 // Build a new, canonical typeof(expr) type. 2660 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2661 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2662 dt = Canon; 2663 } 2664 } else { 2665 QualType T = getDecltypeForExpr(e, *this); 2666 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2667 } 2668 Types.push_back(dt); 2669 return QualType(dt, 0); 2670} 2671 2672/// getTagDeclType - Return the unique reference to the type for the 2673/// specified TagDecl (struct/union/class/enum) decl. 2674QualType ASTContext::getTagDeclType(const TagDecl *Decl) const { 2675 assert (Decl); 2676 // FIXME: What is the design on getTagDeclType when it requires casting 2677 // away const? mutable? 2678 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2679} 2680 2681/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2682/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2683/// needs to agree with the definition in <stddef.h>. 2684CanQualType ASTContext::getSizeType() const { 2685 return getFromTargetType(Target.getSizeType()); 2686} 2687 2688/// getSignedWCharType - Return the type of "signed wchar_t". 2689/// Used when in C++, as a GCC extension. 2690QualType ASTContext::getSignedWCharType() const { 2691 // FIXME: derive from "Target" ? 2692 return WCharTy; 2693} 2694 2695/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2696/// Used when in C++, as a GCC extension. 2697QualType ASTContext::getUnsignedWCharType() const { 2698 // FIXME: derive from "Target" ? 2699 return UnsignedIntTy; 2700} 2701 2702/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2703/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2704QualType ASTContext::getPointerDiffType() const { 2705 return getFromTargetType(Target.getPtrDiffType(0)); 2706} 2707 2708//===----------------------------------------------------------------------===// 2709// Type Operators 2710//===----------------------------------------------------------------------===// 2711 2712CanQualType ASTContext::getCanonicalParamType(QualType T) const { 2713 // Push qualifiers into arrays, and then discard any remaining 2714 // qualifiers. 2715 T = getCanonicalType(T); 2716 T = getVariableArrayDecayedType(T); 2717 const Type *Ty = T.getTypePtr(); 2718 QualType Result; 2719 if (isa<ArrayType>(Ty)) { 2720 Result = getArrayDecayedType(QualType(Ty,0)); 2721 } else if (isa<FunctionType>(Ty)) { 2722 Result = getPointerType(QualType(Ty, 0)); 2723 } else { 2724 Result = QualType(Ty, 0); 2725 } 2726 2727 return CanQualType::CreateUnsafe(Result); 2728} 2729 2730 2731QualType ASTContext::getUnqualifiedArrayType(QualType type, 2732 Qualifiers &quals) { 2733 SplitQualType splitType = type.getSplitUnqualifiedType(); 2734 2735 // FIXME: getSplitUnqualifiedType() actually walks all the way to 2736 // the unqualified desugared type and then drops it on the floor. 2737 // We then have to strip that sugar back off with 2738 // getUnqualifiedDesugaredType(), which is silly. 2739 const ArrayType *AT = 2740 dyn_cast<ArrayType>(splitType.first->getUnqualifiedDesugaredType()); 2741 2742 // If we don't have an array, just use the results in splitType. 2743 if (!AT) { 2744 quals = splitType.second; 2745 return QualType(splitType.first, 0); 2746 } 2747 2748 // Otherwise, recurse on the array's element type. 2749 QualType elementType = AT->getElementType(); 2750 QualType unqualElementType = getUnqualifiedArrayType(elementType, quals); 2751 2752 // If that didn't change the element type, AT has no qualifiers, so we 2753 // can just use the results in splitType. 2754 if (elementType == unqualElementType) { 2755 assert(quals.empty()); // from the recursive call 2756 quals = splitType.second; 2757 return QualType(splitType.first, 0); 2758 } 2759 2760 // Otherwise, add in the qualifiers from the outermost type, then 2761 // build the type back up. 2762 quals.addConsistentQualifiers(splitType.second); 2763 2764 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) { 2765 return getConstantArrayType(unqualElementType, CAT->getSize(), 2766 CAT->getSizeModifier(), 0); 2767 } 2768 2769 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 2770 return getIncompleteArrayType(unqualElementType, IAT->getSizeModifier(), 0); 2771 } 2772 2773 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(AT)) { 2774 return getVariableArrayType(unqualElementType, 2775 VAT->getSizeExpr(), 2776 VAT->getSizeModifier(), 2777 VAT->getIndexTypeCVRQualifiers(), 2778 VAT->getBracketsRange()); 2779 } 2780 2781 const DependentSizedArrayType *DSAT = cast<DependentSizedArrayType>(AT); 2782 return getDependentSizedArrayType(unqualElementType, DSAT->getSizeExpr(), 2783 DSAT->getSizeModifier(), 0, 2784 SourceRange()); 2785} 2786 2787/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 2788/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 2789/// they point to and return true. If T1 and T2 aren't pointer types 2790/// or pointer-to-member types, or if they are not similar at this 2791/// level, returns false and leaves T1 and T2 unchanged. Top-level 2792/// qualifiers on T1 and T2 are ignored. This function will typically 2793/// be called in a loop that successively "unwraps" pointer and 2794/// pointer-to-member types to compare them at each level. 2795bool ASTContext::UnwrapSimilarPointerTypes(QualType &T1, QualType &T2) { 2796 const PointerType *T1PtrType = T1->getAs<PointerType>(), 2797 *T2PtrType = T2->getAs<PointerType>(); 2798 if (T1PtrType && T2PtrType) { 2799 T1 = T1PtrType->getPointeeType(); 2800 T2 = T2PtrType->getPointeeType(); 2801 return true; 2802 } 2803 2804 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 2805 *T2MPType = T2->getAs<MemberPointerType>(); 2806 if (T1MPType && T2MPType && 2807 hasSameUnqualifiedType(QualType(T1MPType->getClass(), 0), 2808 QualType(T2MPType->getClass(), 0))) { 2809 T1 = T1MPType->getPointeeType(); 2810 T2 = T2MPType->getPointeeType(); 2811 return true; 2812 } 2813 2814 if (getLangOptions().ObjC1) { 2815 const ObjCObjectPointerType *T1OPType = T1->getAs<ObjCObjectPointerType>(), 2816 *T2OPType = T2->getAs<ObjCObjectPointerType>(); 2817 if (T1OPType && T2OPType) { 2818 T1 = T1OPType->getPointeeType(); 2819 T2 = T2OPType->getPointeeType(); 2820 return true; 2821 } 2822 } 2823 2824 // FIXME: Block pointers, too? 2825 2826 return false; 2827} 2828 2829DeclarationNameInfo 2830ASTContext::getNameForTemplate(TemplateName Name, 2831 SourceLocation NameLoc) const { 2832 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2833 // DNInfo work in progress: CHECKME: what about DNLoc? 2834 return DeclarationNameInfo(TD->getDeclName(), NameLoc); 2835 2836 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2837 DeclarationName DName; 2838 if (DTN->isIdentifier()) { 2839 DName = DeclarationNames.getIdentifier(DTN->getIdentifier()); 2840 return DeclarationNameInfo(DName, NameLoc); 2841 } else { 2842 DName = DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2843 // DNInfo work in progress: FIXME: source locations? 2844 DeclarationNameLoc DNLoc; 2845 DNLoc.CXXOperatorName.BeginOpNameLoc = SourceLocation().getRawEncoding(); 2846 DNLoc.CXXOperatorName.EndOpNameLoc = SourceLocation().getRawEncoding(); 2847 return DeclarationNameInfo(DName, NameLoc, DNLoc); 2848 } 2849 } 2850 2851 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2852 assert(Storage); 2853 // DNInfo work in progress: CHECKME: what about DNLoc? 2854 return DeclarationNameInfo((*Storage->begin())->getDeclName(), NameLoc); 2855} 2856 2857TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) const { 2858 if (TemplateDecl *Template = Name.getAsTemplateDecl()) { 2859 if (TemplateTemplateParmDecl *TTP 2860 = dyn_cast<TemplateTemplateParmDecl>(Template)) 2861 Template = getCanonicalTemplateTemplateParmDecl(TTP); 2862 2863 // The canonical template name is the canonical template declaration. 2864 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2865 } 2866 2867 if (SubstTemplateTemplateParmPackStorage *SubstPack 2868 = Name.getAsSubstTemplateTemplateParmPack()) { 2869 TemplateTemplateParmDecl *CanonParam 2870 = getCanonicalTemplateTemplateParmDecl(SubstPack->getParameterPack()); 2871 TemplateArgument CanonArgPack 2872 = getCanonicalTemplateArgument(SubstPack->getArgumentPack()); 2873 return getSubstTemplateTemplateParmPack(CanonParam, CanonArgPack); 2874 } 2875 2876 assert(!Name.getAsOverloadedTemplate()); 2877 2878 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2879 assert(DTN && "Non-dependent template names must refer to template decls."); 2880 return DTN->CanonicalTemplateName; 2881} 2882 2883bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2884 X = getCanonicalTemplateName(X); 2885 Y = getCanonicalTemplateName(Y); 2886 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2887} 2888 2889TemplateArgument 2890ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) const { 2891 switch (Arg.getKind()) { 2892 case TemplateArgument::Null: 2893 return Arg; 2894 2895 case TemplateArgument::Expression: 2896 return Arg; 2897 2898 case TemplateArgument::Declaration: 2899 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2900 2901 case TemplateArgument::Template: 2902 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2903 2904 case TemplateArgument::TemplateExpansion: 2905 return TemplateArgument(getCanonicalTemplateName( 2906 Arg.getAsTemplateOrTemplatePattern()), 2907 Arg.getNumTemplateExpansions()); 2908 2909 case TemplateArgument::Integral: 2910 return TemplateArgument(*Arg.getAsIntegral(), 2911 getCanonicalType(Arg.getIntegralType())); 2912 2913 case TemplateArgument::Type: 2914 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2915 2916 case TemplateArgument::Pack: { 2917 if (Arg.pack_size() == 0) 2918 return Arg; 2919 2920 TemplateArgument *CanonArgs 2921 = new (*this) TemplateArgument[Arg.pack_size()]; 2922 unsigned Idx = 0; 2923 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2924 AEnd = Arg.pack_end(); 2925 A != AEnd; (void)++A, ++Idx) 2926 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2927 2928 return TemplateArgument(CanonArgs, Arg.pack_size()); 2929 } 2930 } 2931 2932 // Silence GCC warning 2933 assert(false && "Unhandled template argument kind"); 2934 return TemplateArgument(); 2935} 2936 2937NestedNameSpecifier * 2938ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) const { 2939 if (!NNS) 2940 return 0; 2941 2942 switch (NNS->getKind()) { 2943 case NestedNameSpecifier::Identifier: 2944 // Canonicalize the prefix but keep the identifier the same. 2945 return NestedNameSpecifier::Create(*this, 2946 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2947 NNS->getAsIdentifier()); 2948 2949 case NestedNameSpecifier::Namespace: 2950 // A namespace is canonical; build a nested-name-specifier with 2951 // this namespace and no prefix. 2952 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2953 2954 case NestedNameSpecifier::TypeSpec: 2955 case NestedNameSpecifier::TypeSpecWithTemplate: { 2956 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2957 2958 // If we have some kind of dependent-named type (e.g., "typename T::type"), 2959 // break it apart into its prefix and identifier, then reconsititute those 2960 // as the canonical nested-name-specifier. This is required to canonicalize 2961 // a dependent nested-name-specifier involving typedefs of dependent-name 2962 // types, e.g., 2963 // typedef typename T::type T1; 2964 // typedef typename T1::type T2; 2965 if (const DependentNameType *DNT = T->getAs<DependentNameType>()) { 2966 NestedNameSpecifier *Prefix 2967 = getCanonicalNestedNameSpecifier(DNT->getQualifier()); 2968 return NestedNameSpecifier::Create(*this, Prefix, 2969 const_cast<IdentifierInfo *>(DNT->getIdentifier())); 2970 } 2971 2972 // Do the same thing as above, but with dependent-named specializations. 2973 if (const DependentTemplateSpecializationType *DTST 2974 = T->getAs<DependentTemplateSpecializationType>()) { 2975 NestedNameSpecifier *Prefix 2976 = getCanonicalNestedNameSpecifier(DTST->getQualifier()); 2977 TemplateName Name 2978 = getDependentTemplateName(Prefix, DTST->getIdentifier()); 2979 T = getTemplateSpecializationType(Name, 2980 DTST->getArgs(), DTST->getNumArgs()); 2981 T = getCanonicalType(T); 2982 } 2983 2984 return NestedNameSpecifier::Create(*this, 0, false, 2985 const_cast<Type*>(T.getTypePtr())); 2986 } 2987 2988 case NestedNameSpecifier::Global: 2989 // The global specifier is canonical and unique. 2990 return NNS; 2991 } 2992 2993 // Required to silence a GCC warning 2994 return 0; 2995} 2996 2997 2998const ArrayType *ASTContext::getAsArrayType(QualType T) const { 2999 // Handle the non-qualified case efficiently. 3000 if (!T.hasLocalQualifiers()) { 3001 // Handle the common positive case fast. 3002 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 3003 return AT; 3004 } 3005 3006 // Handle the common negative case fast. 3007 if (!isa<ArrayType>(T.getCanonicalType())) 3008 return 0; 3009 3010 // Apply any qualifiers from the array type to the element type. This 3011 // implements C99 6.7.3p8: "If the specification of an array type includes 3012 // any type qualifiers, the element type is so qualified, not the array type." 3013 3014 // If we get here, we either have type qualifiers on the type, or we have 3015 // sugar such as a typedef in the way. If we have type qualifiers on the type 3016 // we must propagate them down into the element type. 3017 3018 SplitQualType split = T.getSplitDesugaredType(); 3019 Qualifiers qs = split.second; 3020 3021 // If we have a simple case, just return now. 3022 const ArrayType *ATy = dyn_cast<ArrayType>(split.first); 3023 if (ATy == 0 || qs.empty()) 3024 return ATy; 3025 3026 // Otherwise, we have an array and we have qualifiers on it. Push the 3027 // qualifiers into the array element type and return a new array type. 3028 QualType NewEltTy = getQualifiedType(ATy->getElementType(), qs); 3029 3030 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 3031 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 3032 CAT->getSizeModifier(), 3033 CAT->getIndexTypeCVRQualifiers())); 3034 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 3035 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 3036 IAT->getSizeModifier(), 3037 IAT->getIndexTypeCVRQualifiers())); 3038 3039 if (const DependentSizedArrayType *DSAT 3040 = dyn_cast<DependentSizedArrayType>(ATy)) 3041 return cast<ArrayType>( 3042 getDependentSizedArrayType(NewEltTy, 3043 DSAT->getSizeExpr(), 3044 DSAT->getSizeModifier(), 3045 DSAT->getIndexTypeCVRQualifiers(), 3046 DSAT->getBracketsRange())); 3047 3048 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 3049 return cast<ArrayType>(getVariableArrayType(NewEltTy, 3050 VAT->getSizeExpr(), 3051 VAT->getSizeModifier(), 3052 VAT->getIndexTypeCVRQualifiers(), 3053 VAT->getBracketsRange())); 3054} 3055 3056/// getArrayDecayedType - Return the properly qualified result of decaying the 3057/// specified array type to a pointer. This operation is non-trivial when 3058/// handling typedefs etc. The canonical type of "T" must be an array type, 3059/// this returns a pointer to a properly qualified element of the array. 3060/// 3061/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 3062QualType ASTContext::getArrayDecayedType(QualType Ty) const { 3063 // Get the element type with 'getAsArrayType' so that we don't lose any 3064 // typedefs in the element type of the array. This also handles propagation 3065 // of type qualifiers from the array type into the element type if present 3066 // (C99 6.7.3p8). 3067 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 3068 assert(PrettyArrayType && "Not an array type!"); 3069 3070 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 3071 3072 // int x[restrict 4] -> int *restrict 3073 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 3074} 3075 3076QualType ASTContext::getBaseElementType(const ArrayType *array) const { 3077 return getBaseElementType(array->getElementType()); 3078} 3079 3080QualType ASTContext::getBaseElementType(QualType type) const { 3081 Qualifiers qs; 3082 while (true) { 3083 SplitQualType split = type.getSplitDesugaredType(); 3084 const ArrayType *array = split.first->getAsArrayTypeUnsafe(); 3085 if (!array) break; 3086 3087 type = array->getElementType(); 3088 qs.addConsistentQualifiers(split.second); 3089 } 3090 3091 return getQualifiedType(type, qs); 3092} 3093 3094/// getConstantArrayElementCount - Returns number of constant array elements. 3095uint64_t 3096ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 3097 uint64_t ElementCount = 1; 3098 do { 3099 ElementCount *= CA->getSize().getZExtValue(); 3100 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 3101 } while (CA); 3102 return ElementCount; 3103} 3104 3105/// getFloatingRank - Return a relative rank for floating point types. 3106/// This routine will assert if passed a built-in type that isn't a float. 3107static FloatingRank getFloatingRank(QualType T) { 3108 if (const ComplexType *CT = T->getAs<ComplexType>()) 3109 return getFloatingRank(CT->getElementType()); 3110 3111 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 3112 switch (T->getAs<BuiltinType>()->getKind()) { 3113 default: assert(0 && "getFloatingRank(): not a floating type"); 3114 case BuiltinType::Float: return FloatRank; 3115 case BuiltinType::Double: return DoubleRank; 3116 case BuiltinType::LongDouble: return LongDoubleRank; 3117 } 3118} 3119 3120/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 3121/// point or a complex type (based on typeDomain/typeSize). 3122/// 'typeDomain' is a real floating point or complex type. 3123/// 'typeSize' is a real floating point or complex type. 3124QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 3125 QualType Domain) const { 3126 FloatingRank EltRank = getFloatingRank(Size); 3127 if (Domain->isComplexType()) { 3128 switch (EltRank) { 3129 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3130 case FloatRank: return FloatComplexTy; 3131 case DoubleRank: return DoubleComplexTy; 3132 case LongDoubleRank: return LongDoubleComplexTy; 3133 } 3134 } 3135 3136 assert(Domain->isRealFloatingType() && "Unknown domain!"); 3137 switch (EltRank) { 3138 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3139 case FloatRank: return FloatTy; 3140 case DoubleRank: return DoubleTy; 3141 case LongDoubleRank: return LongDoubleTy; 3142 } 3143} 3144 3145/// getFloatingTypeOrder - Compare the rank of the two specified floating 3146/// point types, ignoring the domain of the type (i.e. 'double' == 3147/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 3148/// LHS < RHS, return -1. 3149int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) const { 3150 FloatingRank LHSR = getFloatingRank(LHS); 3151 FloatingRank RHSR = getFloatingRank(RHS); 3152 3153 if (LHSR == RHSR) 3154 return 0; 3155 if (LHSR > RHSR) 3156 return 1; 3157 return -1; 3158} 3159 3160/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 3161/// routine will assert if passed a built-in type that isn't an integer or enum, 3162/// or if it is not canonicalized. 3163unsigned ASTContext::getIntegerRank(const Type *T) const { 3164 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 3165 if (const EnumType* ET = dyn_cast<EnumType>(T)) 3166 T = ET->getDecl()->getPromotionType().getTypePtr(); 3167 3168 if (T->isSpecificBuiltinType(BuiltinType::WChar_S) || 3169 T->isSpecificBuiltinType(BuiltinType::WChar_U)) 3170 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 3171 3172 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 3173 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 3174 3175 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 3176 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 3177 3178 switch (cast<BuiltinType>(T)->getKind()) { 3179 default: assert(0 && "getIntegerRank(): not a built-in integer"); 3180 case BuiltinType::Bool: 3181 return 1 + (getIntWidth(BoolTy) << 3); 3182 case BuiltinType::Char_S: 3183 case BuiltinType::Char_U: 3184 case BuiltinType::SChar: 3185 case BuiltinType::UChar: 3186 return 2 + (getIntWidth(CharTy) << 3); 3187 case BuiltinType::Short: 3188 case BuiltinType::UShort: 3189 return 3 + (getIntWidth(ShortTy) << 3); 3190 case BuiltinType::Int: 3191 case BuiltinType::UInt: 3192 return 4 + (getIntWidth(IntTy) << 3); 3193 case BuiltinType::Long: 3194 case BuiltinType::ULong: 3195 return 5 + (getIntWidth(LongTy) << 3); 3196 case BuiltinType::LongLong: 3197 case BuiltinType::ULongLong: 3198 return 6 + (getIntWidth(LongLongTy) << 3); 3199 case BuiltinType::Int128: 3200 case BuiltinType::UInt128: 3201 return 7 + (getIntWidth(Int128Ty) << 3); 3202 } 3203} 3204 3205/// \brief Whether this is a promotable bitfield reference according 3206/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 3207/// 3208/// \returns the type this bit-field will promote to, or NULL if no 3209/// promotion occurs. 3210QualType ASTContext::isPromotableBitField(Expr *E) const { 3211 if (E->isTypeDependent() || E->isValueDependent()) 3212 return QualType(); 3213 3214 FieldDecl *Field = E->getBitField(); 3215 if (!Field) 3216 return QualType(); 3217 3218 QualType FT = Field->getType(); 3219 3220 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 3221 uint64_t BitWidth = BitWidthAP.getZExtValue(); 3222 uint64_t IntSize = getTypeSize(IntTy); 3223 // GCC extension compatibility: if the bit-field size is less than or equal 3224 // to the size of int, it gets promoted no matter what its type is. 3225 // For instance, unsigned long bf : 4 gets promoted to signed int. 3226 if (BitWidth < IntSize) 3227 return IntTy; 3228 3229 if (BitWidth == IntSize) 3230 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 3231 3232 // Types bigger than int are not subject to promotions, and therefore act 3233 // like the base type. 3234 // FIXME: This doesn't quite match what gcc does, but what gcc does here 3235 // is ridiculous. 3236 return QualType(); 3237} 3238 3239/// getPromotedIntegerType - Returns the type that Promotable will 3240/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 3241/// integer type. 3242QualType ASTContext::getPromotedIntegerType(QualType Promotable) const { 3243 assert(!Promotable.isNull()); 3244 assert(Promotable->isPromotableIntegerType()); 3245 if (const EnumType *ET = Promotable->getAs<EnumType>()) 3246 return ET->getDecl()->getPromotionType(); 3247 if (Promotable->isSignedIntegerType()) 3248 return IntTy; 3249 uint64_t PromotableSize = getTypeSize(Promotable); 3250 uint64_t IntSize = getTypeSize(IntTy); 3251 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 3252 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 3253} 3254 3255/// getIntegerTypeOrder - Returns the highest ranked integer type: 3256/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 3257/// LHS < RHS, return -1. 3258int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) const { 3259 const Type *LHSC = getCanonicalType(LHS).getTypePtr(); 3260 const Type *RHSC = getCanonicalType(RHS).getTypePtr(); 3261 if (LHSC == RHSC) return 0; 3262 3263 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 3264 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 3265 3266 unsigned LHSRank = getIntegerRank(LHSC); 3267 unsigned RHSRank = getIntegerRank(RHSC); 3268 3269 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 3270 if (LHSRank == RHSRank) return 0; 3271 return LHSRank > RHSRank ? 1 : -1; 3272 } 3273 3274 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 3275 if (LHSUnsigned) { 3276 // If the unsigned [LHS] type is larger, return it. 3277 if (LHSRank >= RHSRank) 3278 return 1; 3279 3280 // If the signed type can represent all values of the unsigned type, it 3281 // wins. Because we are dealing with 2's complement and types that are 3282 // powers of two larger than each other, this is always safe. 3283 return -1; 3284 } 3285 3286 // If the unsigned [RHS] type is larger, return it. 3287 if (RHSRank >= LHSRank) 3288 return -1; 3289 3290 // If the signed type can represent all values of the unsigned type, it 3291 // wins. Because we are dealing with 2's complement and types that are 3292 // powers of two larger than each other, this is always safe. 3293 return 1; 3294} 3295 3296static RecordDecl * 3297CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 3298 SourceLocation L, IdentifierInfo *Id) { 3299 if (Ctx.getLangOptions().CPlusPlus) 3300 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 3301 else 3302 return RecordDecl::Create(Ctx, TK, DC, L, Id); 3303} 3304 3305// getCFConstantStringType - Return the type used for constant CFStrings. 3306QualType ASTContext::getCFConstantStringType() const { 3307 if (!CFConstantStringTypeDecl) { 3308 CFConstantStringTypeDecl = 3309 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3310 &Idents.get("NSConstantString")); 3311 CFConstantStringTypeDecl->startDefinition(); 3312 3313 QualType FieldTypes[4]; 3314 3315 // const int *isa; 3316 FieldTypes[0] = getPointerType(IntTy.withConst()); 3317 // int flags; 3318 FieldTypes[1] = IntTy; 3319 // const char *str; 3320 FieldTypes[2] = getPointerType(CharTy.withConst()); 3321 // long length; 3322 FieldTypes[3] = LongTy; 3323 3324 // Create fields 3325 for (unsigned i = 0; i < 4; ++i) { 3326 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 3327 SourceLocation(), 0, 3328 FieldTypes[i], /*TInfo=*/0, 3329 /*BitWidth=*/0, 3330 /*Mutable=*/false); 3331 Field->setAccess(AS_public); 3332 CFConstantStringTypeDecl->addDecl(Field); 3333 } 3334 3335 CFConstantStringTypeDecl->completeDefinition(); 3336 } 3337 3338 return getTagDeclType(CFConstantStringTypeDecl); 3339} 3340 3341void ASTContext::setCFConstantStringType(QualType T) { 3342 const RecordType *Rec = T->getAs<RecordType>(); 3343 assert(Rec && "Invalid CFConstantStringType"); 3344 CFConstantStringTypeDecl = Rec->getDecl(); 3345} 3346 3347// getNSConstantStringType - Return the type used for constant NSStrings. 3348QualType ASTContext::getNSConstantStringType() const { 3349 if (!NSConstantStringTypeDecl) { 3350 NSConstantStringTypeDecl = 3351 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3352 &Idents.get("__builtin_NSString")); 3353 NSConstantStringTypeDecl->startDefinition(); 3354 3355 QualType FieldTypes[3]; 3356 3357 // const int *isa; 3358 FieldTypes[0] = getPointerType(IntTy.withConst()); 3359 // const char *str; 3360 FieldTypes[1] = getPointerType(CharTy.withConst()); 3361 // unsigned int length; 3362 FieldTypes[2] = UnsignedIntTy; 3363 3364 // Create fields 3365 for (unsigned i = 0; i < 3; ++i) { 3366 FieldDecl *Field = FieldDecl::Create(*this, NSConstantStringTypeDecl, 3367 SourceLocation(), 0, 3368 FieldTypes[i], /*TInfo=*/0, 3369 /*BitWidth=*/0, 3370 /*Mutable=*/false); 3371 Field->setAccess(AS_public); 3372 NSConstantStringTypeDecl->addDecl(Field); 3373 } 3374 3375 NSConstantStringTypeDecl->completeDefinition(); 3376 } 3377 3378 return getTagDeclType(NSConstantStringTypeDecl); 3379} 3380 3381void ASTContext::setNSConstantStringType(QualType T) { 3382 const RecordType *Rec = T->getAs<RecordType>(); 3383 assert(Rec && "Invalid NSConstantStringType"); 3384 NSConstantStringTypeDecl = Rec->getDecl(); 3385} 3386 3387QualType ASTContext::getObjCFastEnumerationStateType() const { 3388 if (!ObjCFastEnumerationStateTypeDecl) { 3389 ObjCFastEnumerationStateTypeDecl = 3390 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3391 &Idents.get("__objcFastEnumerationState")); 3392 ObjCFastEnumerationStateTypeDecl->startDefinition(); 3393 3394 QualType FieldTypes[] = { 3395 UnsignedLongTy, 3396 getPointerType(ObjCIdTypedefType), 3397 getPointerType(UnsignedLongTy), 3398 getConstantArrayType(UnsignedLongTy, 3399 llvm::APInt(32, 5), ArrayType::Normal, 0) 3400 }; 3401 3402 for (size_t i = 0; i < 4; ++i) { 3403 FieldDecl *Field = FieldDecl::Create(*this, 3404 ObjCFastEnumerationStateTypeDecl, 3405 SourceLocation(), 0, 3406 FieldTypes[i], /*TInfo=*/0, 3407 /*BitWidth=*/0, 3408 /*Mutable=*/false); 3409 Field->setAccess(AS_public); 3410 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 3411 } 3412 3413 ObjCFastEnumerationStateTypeDecl->completeDefinition(); 3414 } 3415 3416 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 3417} 3418 3419QualType ASTContext::getBlockDescriptorType() const { 3420 if (BlockDescriptorType) 3421 return getTagDeclType(BlockDescriptorType); 3422 3423 RecordDecl *T; 3424 // FIXME: Needs the FlagAppleBlock bit. 3425 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3426 &Idents.get("__block_descriptor")); 3427 T->startDefinition(); 3428 3429 QualType FieldTypes[] = { 3430 UnsignedLongTy, 3431 UnsignedLongTy, 3432 }; 3433 3434 const char *FieldNames[] = { 3435 "reserved", 3436 "Size" 3437 }; 3438 3439 for (size_t i = 0; i < 2; ++i) { 3440 FieldDecl *Field = FieldDecl::Create(*this, 3441 T, 3442 SourceLocation(), 3443 &Idents.get(FieldNames[i]), 3444 FieldTypes[i], /*TInfo=*/0, 3445 /*BitWidth=*/0, 3446 /*Mutable=*/false); 3447 Field->setAccess(AS_public); 3448 T->addDecl(Field); 3449 } 3450 3451 T->completeDefinition(); 3452 3453 BlockDescriptorType = T; 3454 3455 return getTagDeclType(BlockDescriptorType); 3456} 3457 3458void ASTContext::setBlockDescriptorType(QualType T) { 3459 const RecordType *Rec = T->getAs<RecordType>(); 3460 assert(Rec && "Invalid BlockDescriptorType"); 3461 BlockDescriptorType = Rec->getDecl(); 3462} 3463 3464QualType ASTContext::getBlockDescriptorExtendedType() const { 3465 if (BlockDescriptorExtendedType) 3466 return getTagDeclType(BlockDescriptorExtendedType); 3467 3468 RecordDecl *T; 3469 // FIXME: Needs the FlagAppleBlock bit. 3470 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3471 &Idents.get("__block_descriptor_withcopydispose")); 3472 T->startDefinition(); 3473 3474 QualType FieldTypes[] = { 3475 UnsignedLongTy, 3476 UnsignedLongTy, 3477 getPointerType(VoidPtrTy), 3478 getPointerType(VoidPtrTy) 3479 }; 3480 3481 const char *FieldNames[] = { 3482 "reserved", 3483 "Size", 3484 "CopyFuncPtr", 3485 "DestroyFuncPtr" 3486 }; 3487 3488 for (size_t i = 0; i < 4; ++i) { 3489 FieldDecl *Field = FieldDecl::Create(*this, 3490 T, 3491 SourceLocation(), 3492 &Idents.get(FieldNames[i]), 3493 FieldTypes[i], /*TInfo=*/0, 3494 /*BitWidth=*/0, 3495 /*Mutable=*/false); 3496 Field->setAccess(AS_public); 3497 T->addDecl(Field); 3498 } 3499 3500 T->completeDefinition(); 3501 3502 BlockDescriptorExtendedType = T; 3503 3504 return getTagDeclType(BlockDescriptorExtendedType); 3505} 3506 3507void ASTContext::setBlockDescriptorExtendedType(QualType T) { 3508 const RecordType *Rec = T->getAs<RecordType>(); 3509 assert(Rec && "Invalid BlockDescriptorType"); 3510 BlockDescriptorExtendedType = Rec->getDecl(); 3511} 3512 3513bool ASTContext::BlockRequiresCopying(QualType Ty) const { 3514 if (Ty->isBlockPointerType()) 3515 return true; 3516 if (isObjCNSObjectType(Ty)) 3517 return true; 3518 if (Ty->isObjCObjectPointerType()) 3519 return true; 3520 if (getLangOptions().CPlusPlus) { 3521 if (const RecordType *RT = Ty->getAs<RecordType>()) { 3522 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3523 return RD->hasConstCopyConstructor(*this); 3524 3525 } 3526 } 3527 return false; 3528} 3529 3530QualType 3531ASTContext::BuildByRefType(llvm::StringRef DeclName, QualType Ty) const { 3532 // type = struct __Block_byref_1_X { 3533 // void *__isa; 3534 // struct __Block_byref_1_X *__forwarding; 3535 // unsigned int __flags; 3536 // unsigned int __size; 3537 // void *__copy_helper; // as needed 3538 // void *__destroy_help // as needed 3539 // int X; 3540 // } * 3541 3542 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 3543 3544 // FIXME: Move up 3545 llvm::SmallString<36> Name; 3546 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 3547 ++UniqueBlockByRefTypeID << '_' << DeclName; 3548 RecordDecl *T; 3549 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3550 &Idents.get(Name.str())); 3551 T->startDefinition(); 3552 QualType Int32Ty = IntTy; 3553 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 3554 QualType FieldTypes[] = { 3555 getPointerType(VoidPtrTy), 3556 getPointerType(getTagDeclType(T)), 3557 Int32Ty, 3558 Int32Ty, 3559 getPointerType(VoidPtrTy), 3560 getPointerType(VoidPtrTy), 3561 Ty 3562 }; 3563 3564 llvm::StringRef FieldNames[] = { 3565 "__isa", 3566 "__forwarding", 3567 "__flags", 3568 "__size", 3569 "__copy_helper", 3570 "__destroy_helper", 3571 DeclName, 3572 }; 3573 3574 for (size_t i = 0; i < 7; ++i) { 3575 if (!HasCopyAndDispose && i >=4 && i <= 5) 3576 continue; 3577 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3578 &Idents.get(FieldNames[i]), 3579 FieldTypes[i], /*TInfo=*/0, 3580 /*BitWidth=*/0, /*Mutable=*/false); 3581 Field->setAccess(AS_public); 3582 T->addDecl(Field); 3583 } 3584 3585 T->completeDefinition(); 3586 3587 return getPointerType(getTagDeclType(T)); 3588} 3589 3590 3591QualType ASTContext::getBlockParmType( 3592 bool BlockHasCopyDispose, 3593 llvm::SmallVectorImpl<const Expr *> &Layout) const { 3594 3595 // FIXME: Move up 3596 llvm::SmallString<36> Name; 3597 llvm::raw_svector_ostream(Name) << "__block_literal_" 3598 << ++UniqueBlockParmTypeID; 3599 RecordDecl *T; 3600 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3601 &Idents.get(Name.str())); 3602 T->startDefinition(); 3603 QualType FieldTypes[] = { 3604 getPointerType(VoidPtrTy), 3605 IntTy, 3606 IntTy, 3607 getPointerType(VoidPtrTy), 3608 (BlockHasCopyDispose ? 3609 getPointerType(getBlockDescriptorExtendedType()) : 3610 getPointerType(getBlockDescriptorType())) 3611 }; 3612 3613 const char *FieldNames[] = { 3614 "__isa", 3615 "__flags", 3616 "__reserved", 3617 "__FuncPtr", 3618 "__descriptor" 3619 }; 3620 3621 for (size_t i = 0; i < 5; ++i) { 3622 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3623 &Idents.get(FieldNames[i]), 3624 FieldTypes[i], /*TInfo=*/0, 3625 /*BitWidth=*/0, /*Mutable=*/false); 3626 Field->setAccess(AS_public); 3627 T->addDecl(Field); 3628 } 3629 3630 for (unsigned i = 0; i < Layout.size(); ++i) { 3631 const Expr *E = Layout[i]; 3632 3633 QualType FieldType = E->getType(); 3634 IdentifierInfo *FieldName = 0; 3635 if (isa<CXXThisExpr>(E)) { 3636 FieldName = &Idents.get("this"); 3637 } else if (const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E)) { 3638 const ValueDecl *D = BDRE->getDecl(); 3639 FieldName = D->getIdentifier(); 3640 if (BDRE->isByRef()) 3641 FieldType = BuildByRefType(D->getName(), FieldType); 3642 } else { 3643 // Padding. 3644 assert(isa<ConstantArrayType>(FieldType) && 3645 isa<DeclRefExpr>(E) && 3646 !cast<DeclRefExpr>(E)->getDecl()->getDeclName() && 3647 "doesn't match characteristics of padding decl"); 3648 } 3649 3650 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3651 FieldName, FieldType, /*TInfo=*/0, 3652 /*BitWidth=*/0, /*Mutable=*/false); 3653 Field->setAccess(AS_public); 3654 T->addDecl(Field); 3655 } 3656 3657 T->completeDefinition(); 3658 3659 return getPointerType(getTagDeclType(T)); 3660} 3661 3662void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3663 const RecordType *Rec = T->getAs<RecordType>(); 3664 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3665 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3666} 3667 3668// This returns true if a type has been typedefed to BOOL: 3669// typedef <type> BOOL; 3670static bool isTypeTypedefedAsBOOL(QualType T) { 3671 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3672 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3673 return II->isStr("BOOL"); 3674 3675 return false; 3676} 3677 3678/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3679/// purpose. 3680CharUnits ASTContext::getObjCEncodingTypeSize(QualType type) const { 3681 CharUnits sz = getTypeSizeInChars(type); 3682 3683 // Make all integer and enum types at least as large as an int 3684 if (sz.isPositive() && type->isIntegralOrEnumerationType()) 3685 sz = std::max(sz, getTypeSizeInChars(IntTy)); 3686 // Treat arrays as pointers, since that's how they're passed in. 3687 else if (type->isArrayType()) 3688 sz = getTypeSizeInChars(VoidPtrTy); 3689 return sz; 3690} 3691 3692static inline 3693std::string charUnitsToString(const CharUnits &CU) { 3694 return llvm::itostr(CU.getQuantity()); 3695} 3696 3697/// getObjCEncodingForBlock - Return the encoded type for this block 3698/// declaration. 3699std::string ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr) const { 3700 std::string S; 3701 3702 const BlockDecl *Decl = Expr->getBlockDecl(); 3703 QualType BlockTy = 3704 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3705 // Encode result type. 3706 getObjCEncodingForType(BlockTy->getAs<FunctionType>()->getResultType(), S); 3707 // Compute size of all parameters. 3708 // Start with computing size of a pointer in number of bytes. 3709 // FIXME: There might(should) be a better way of doing this computation! 3710 SourceLocation Loc; 3711 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3712 CharUnits ParmOffset = PtrSize; 3713 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), 3714 E = Decl->param_end(); PI != E; ++PI) { 3715 QualType PType = (*PI)->getType(); 3716 CharUnits sz = getObjCEncodingTypeSize(PType); 3717 assert (sz.isPositive() && "BlockExpr - Incomplete param type"); 3718 ParmOffset += sz; 3719 } 3720 // Size of the argument frame 3721 S += charUnitsToString(ParmOffset); 3722 // Block pointer and offset. 3723 S += "@?0"; 3724 ParmOffset = PtrSize; 3725 3726 // Argument types. 3727 ParmOffset = PtrSize; 3728 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3729 Decl->param_end(); PI != E; ++PI) { 3730 ParmVarDecl *PVDecl = *PI; 3731 QualType PType = PVDecl->getOriginalType(); 3732 if (const ArrayType *AT = 3733 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3734 // Use array's original type only if it has known number of 3735 // elements. 3736 if (!isa<ConstantArrayType>(AT)) 3737 PType = PVDecl->getType(); 3738 } else if (PType->isFunctionType()) 3739 PType = PVDecl->getType(); 3740 getObjCEncodingForType(PType, S); 3741 S += charUnitsToString(ParmOffset); 3742 ParmOffset += getObjCEncodingTypeSize(PType); 3743 } 3744 3745 return S; 3746} 3747 3748void ASTContext::getObjCEncodingForFunctionDecl(const FunctionDecl *Decl, 3749 std::string& S) { 3750 // Encode result type. 3751 getObjCEncodingForType(Decl->getResultType(), S); 3752 CharUnits ParmOffset; 3753 // Compute size of all parameters. 3754 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3755 E = Decl->param_end(); PI != E; ++PI) { 3756 QualType PType = (*PI)->getType(); 3757 CharUnits sz = getObjCEncodingTypeSize(PType); 3758 assert (sz.isPositive() && 3759 "getObjCEncodingForMethodDecl - Incomplete param type"); 3760 ParmOffset += sz; 3761 } 3762 S += charUnitsToString(ParmOffset); 3763 ParmOffset = CharUnits::Zero(); 3764 3765 // Argument types. 3766 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3767 E = Decl->param_end(); PI != E; ++PI) { 3768 ParmVarDecl *PVDecl = *PI; 3769 QualType PType = PVDecl->getOriginalType(); 3770 if (const ArrayType *AT = 3771 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3772 // Use array's original type only if it has known number of 3773 // elements. 3774 if (!isa<ConstantArrayType>(AT)) 3775 PType = PVDecl->getType(); 3776 } else if (PType->isFunctionType()) 3777 PType = PVDecl->getType(); 3778 getObjCEncodingForType(PType, S); 3779 S += charUnitsToString(ParmOffset); 3780 ParmOffset += getObjCEncodingTypeSize(PType); 3781 } 3782} 3783 3784/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3785/// declaration. 3786void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3787 std::string& S) const { 3788 // FIXME: This is not very efficient. 3789 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3790 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3791 // Encode result type. 3792 getObjCEncodingForType(Decl->getResultType(), S); 3793 // Compute size of all parameters. 3794 // Start with computing size of a pointer in number of bytes. 3795 // FIXME: There might(should) be a better way of doing this computation! 3796 SourceLocation Loc; 3797 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3798 // The first two arguments (self and _cmd) are pointers; account for 3799 // their size. 3800 CharUnits ParmOffset = 2 * PtrSize; 3801 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3802 E = Decl->sel_param_end(); PI != E; ++PI) { 3803 QualType PType = (*PI)->getType(); 3804 CharUnits sz = getObjCEncodingTypeSize(PType); 3805 assert (sz.isPositive() && 3806 "getObjCEncodingForMethodDecl - Incomplete param type"); 3807 ParmOffset += sz; 3808 } 3809 S += charUnitsToString(ParmOffset); 3810 S += "@0:"; 3811 S += charUnitsToString(PtrSize); 3812 3813 // Argument types. 3814 ParmOffset = 2 * PtrSize; 3815 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3816 E = Decl->sel_param_end(); PI != E; ++PI) { 3817 ParmVarDecl *PVDecl = *PI; 3818 QualType PType = PVDecl->getOriginalType(); 3819 if (const ArrayType *AT = 3820 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3821 // Use array's original type only if it has known number of 3822 // elements. 3823 if (!isa<ConstantArrayType>(AT)) 3824 PType = PVDecl->getType(); 3825 } else if (PType->isFunctionType()) 3826 PType = PVDecl->getType(); 3827 // Process argument qualifiers for user supplied arguments; such as, 3828 // 'in', 'inout', etc. 3829 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3830 getObjCEncodingForType(PType, S); 3831 S += charUnitsToString(ParmOffset); 3832 ParmOffset += getObjCEncodingTypeSize(PType); 3833 } 3834} 3835 3836/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3837/// property declaration. If non-NULL, Container must be either an 3838/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3839/// NULL when getting encodings for protocol properties. 3840/// Property attributes are stored as a comma-delimited C string. The simple 3841/// attributes readonly and bycopy are encoded as single characters. The 3842/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3843/// encoded as single characters, followed by an identifier. Property types 3844/// are also encoded as a parametrized attribute. The characters used to encode 3845/// these attributes are defined by the following enumeration: 3846/// @code 3847/// enum PropertyAttributes { 3848/// kPropertyReadOnly = 'R', // property is read-only. 3849/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3850/// kPropertyByref = '&', // property is a reference to the value last assigned 3851/// kPropertyDynamic = 'D', // property is dynamic 3852/// kPropertyGetter = 'G', // followed by getter selector name 3853/// kPropertySetter = 'S', // followed by setter selector name 3854/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3855/// kPropertyType = 't' // followed by old-style type encoding. 3856/// kPropertyWeak = 'W' // 'weak' property 3857/// kPropertyStrong = 'P' // property GC'able 3858/// kPropertyNonAtomic = 'N' // property non-atomic 3859/// }; 3860/// @endcode 3861void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3862 const Decl *Container, 3863 std::string& S) const { 3864 // Collect information from the property implementation decl(s). 3865 bool Dynamic = false; 3866 ObjCPropertyImplDecl *SynthesizePID = 0; 3867 3868 // FIXME: Duplicated code due to poor abstraction. 3869 if (Container) { 3870 if (const ObjCCategoryImplDecl *CID = 3871 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3872 for (ObjCCategoryImplDecl::propimpl_iterator 3873 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3874 i != e; ++i) { 3875 ObjCPropertyImplDecl *PID = *i; 3876 if (PID->getPropertyDecl() == PD) { 3877 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3878 Dynamic = true; 3879 } else { 3880 SynthesizePID = PID; 3881 } 3882 } 3883 } 3884 } else { 3885 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3886 for (ObjCCategoryImplDecl::propimpl_iterator 3887 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3888 i != e; ++i) { 3889 ObjCPropertyImplDecl *PID = *i; 3890 if (PID->getPropertyDecl() == PD) { 3891 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3892 Dynamic = true; 3893 } else { 3894 SynthesizePID = PID; 3895 } 3896 } 3897 } 3898 } 3899 } 3900 3901 // FIXME: This is not very efficient. 3902 S = "T"; 3903 3904 // Encode result type. 3905 // GCC has some special rules regarding encoding of properties which 3906 // closely resembles encoding of ivars. 3907 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3908 true /* outermost type */, 3909 true /* encoding for property */); 3910 3911 if (PD->isReadOnly()) { 3912 S += ",R"; 3913 } else { 3914 switch (PD->getSetterKind()) { 3915 case ObjCPropertyDecl::Assign: break; 3916 case ObjCPropertyDecl::Copy: S += ",C"; break; 3917 case ObjCPropertyDecl::Retain: S += ",&"; break; 3918 } 3919 } 3920 3921 // It really isn't clear at all what this means, since properties 3922 // are "dynamic by default". 3923 if (Dynamic) 3924 S += ",D"; 3925 3926 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3927 S += ",N"; 3928 3929 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3930 S += ",G"; 3931 S += PD->getGetterName().getAsString(); 3932 } 3933 3934 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3935 S += ",S"; 3936 S += PD->getSetterName().getAsString(); 3937 } 3938 3939 if (SynthesizePID) { 3940 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3941 S += ",V"; 3942 S += OID->getNameAsString(); 3943 } 3944 3945 // FIXME: OBJCGC: weak & strong 3946} 3947 3948/// getLegacyIntegralTypeEncoding - 3949/// Another legacy compatibility encoding: 32-bit longs are encoded as 3950/// 'l' or 'L' , but not always. For typedefs, we need to use 3951/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3952/// 3953void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3954 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3955 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3956 if (BT->getKind() == BuiltinType::ULong && getIntWidth(PointeeTy) == 32) 3957 PointeeTy = UnsignedIntTy; 3958 else 3959 if (BT->getKind() == BuiltinType::Long && getIntWidth(PointeeTy) == 32) 3960 PointeeTy = IntTy; 3961 } 3962 } 3963} 3964 3965void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3966 const FieldDecl *Field) const { 3967 // We follow the behavior of gcc, expanding structures which are 3968 // directly pointed to, and expanding embedded structures. Note that 3969 // these rules are sufficient to prevent recursive encoding of the 3970 // same type. 3971 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3972 true /* outermost type */); 3973} 3974 3975static char ObjCEncodingForPrimitiveKind(const ASTContext *C, QualType T) { 3976 switch (T->getAs<BuiltinType>()->getKind()) { 3977 default: assert(0 && "Unhandled builtin type kind"); 3978 case BuiltinType::Void: return 'v'; 3979 case BuiltinType::Bool: return 'B'; 3980 case BuiltinType::Char_U: 3981 case BuiltinType::UChar: return 'C'; 3982 case BuiltinType::UShort: return 'S'; 3983 case BuiltinType::UInt: return 'I'; 3984 case BuiltinType::ULong: 3985 return C->getIntWidth(T) == 32 ? 'L' : 'Q'; 3986 case BuiltinType::UInt128: return 'T'; 3987 case BuiltinType::ULongLong: return 'Q'; 3988 case BuiltinType::Char_S: 3989 case BuiltinType::SChar: return 'c'; 3990 case BuiltinType::Short: return 's'; 3991 case BuiltinType::WChar_S: 3992 case BuiltinType::WChar_U: 3993 case BuiltinType::Int: return 'i'; 3994 case BuiltinType::Long: 3995 return C->getIntWidth(T) == 32 ? 'l' : 'q'; 3996 case BuiltinType::LongLong: return 'q'; 3997 case BuiltinType::Int128: return 't'; 3998 case BuiltinType::Float: return 'f'; 3999 case BuiltinType::Double: return 'd'; 4000 case BuiltinType::LongDouble: return 'D'; 4001 } 4002} 4003 4004static void EncodeBitField(const ASTContext *Ctx, std::string& S, 4005 QualType T, const FieldDecl *FD) { 4006 const Expr *E = FD->getBitWidth(); 4007 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 4008 S += 'b'; 4009 // The NeXT runtime encodes bit fields as b followed by the number of bits. 4010 // The GNU runtime requires more information; bitfields are encoded as b, 4011 // then the offset (in bits) of the first element, then the type of the 4012 // bitfield, then the size in bits. For example, in this structure: 4013 // 4014 // struct 4015 // { 4016 // int integer; 4017 // int flags:2; 4018 // }; 4019 // On a 32-bit system, the encoding for flags would be b2 for the NeXT 4020 // runtime, but b32i2 for the GNU runtime. The reason for this extra 4021 // information is not especially sensible, but we're stuck with it for 4022 // compatibility with GCC, although providing it breaks anything that 4023 // actually uses runtime introspection and wants to work on both runtimes... 4024 if (!Ctx->getLangOptions().NeXTRuntime) { 4025 const RecordDecl *RD = FD->getParent(); 4026 const ASTRecordLayout &RL = Ctx->getASTRecordLayout(RD); 4027 // FIXME: This same linear search is also used in ExprConstant - it might 4028 // be better if the FieldDecl stored its offset. We'd be increasing the 4029 // size of the object slightly, but saving some time every time it is used. 4030 unsigned i = 0; 4031 for (RecordDecl::field_iterator Field = RD->field_begin(), 4032 FieldEnd = RD->field_end(); 4033 Field != FieldEnd; (void)++Field, ++i) { 4034 if (*Field == FD) 4035 break; 4036 } 4037 S += llvm::utostr(RL.getFieldOffset(i)); 4038 if (T->isEnumeralType()) 4039 S += 'i'; 4040 else 4041 S += ObjCEncodingForPrimitiveKind(Ctx, T); 4042 } 4043 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 4044 S += llvm::utostr(N); 4045} 4046 4047// FIXME: Use SmallString for accumulating string. 4048void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 4049 bool ExpandPointedToStructures, 4050 bool ExpandStructures, 4051 const FieldDecl *FD, 4052 bool OutermostType, 4053 bool EncodingProperty) const { 4054 if (T->getAs<BuiltinType>()) { 4055 if (FD && FD->isBitField()) 4056 return EncodeBitField(this, S, T, FD); 4057 S += ObjCEncodingForPrimitiveKind(this, T); 4058 return; 4059 } 4060 4061 if (const ComplexType *CT = T->getAs<ComplexType>()) { 4062 S += 'j'; 4063 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 4064 false); 4065 return; 4066 } 4067 4068 // encoding for pointer or r3eference types. 4069 QualType PointeeTy; 4070 if (const PointerType *PT = T->getAs<PointerType>()) { 4071 if (PT->isObjCSelType()) { 4072 S += ':'; 4073 return; 4074 } 4075 PointeeTy = PT->getPointeeType(); 4076 } 4077 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 4078 PointeeTy = RT->getPointeeType(); 4079 if (!PointeeTy.isNull()) { 4080 bool isReadOnly = false; 4081 // For historical/compatibility reasons, the read-only qualifier of the 4082 // pointee gets emitted _before_ the '^'. The read-only qualifier of 4083 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 4084 // Also, do not emit the 'r' for anything but the outermost type! 4085 if (isa<TypedefType>(T.getTypePtr())) { 4086 if (OutermostType && T.isConstQualified()) { 4087 isReadOnly = true; 4088 S += 'r'; 4089 } 4090 } else if (OutermostType) { 4091 QualType P = PointeeTy; 4092 while (P->getAs<PointerType>()) 4093 P = P->getAs<PointerType>()->getPointeeType(); 4094 if (P.isConstQualified()) { 4095 isReadOnly = true; 4096 S += 'r'; 4097 } 4098 } 4099 if (isReadOnly) { 4100 // Another legacy compatibility encoding. Some ObjC qualifier and type 4101 // combinations need to be rearranged. 4102 // Rewrite "in const" from "nr" to "rn" 4103 if (llvm::StringRef(S).endswith("nr")) 4104 S.replace(S.end()-2, S.end(), "rn"); 4105 } 4106 4107 if (PointeeTy->isCharType()) { 4108 // char pointer types should be encoded as '*' unless it is a 4109 // type that has been typedef'd to 'BOOL'. 4110 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 4111 S += '*'; 4112 return; 4113 } 4114 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 4115 // GCC binary compat: Need to convert "struct objc_class *" to "#". 4116 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 4117 S += '#'; 4118 return; 4119 } 4120 // GCC binary compat: Need to convert "struct objc_object *" to "@". 4121 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 4122 S += '@'; 4123 return; 4124 } 4125 // fall through... 4126 } 4127 S += '^'; 4128 getLegacyIntegralTypeEncoding(PointeeTy); 4129 4130 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 4131 NULL); 4132 return; 4133 } 4134 4135 if (const ArrayType *AT = 4136 // Ignore type qualifiers etc. 4137 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 4138 if (isa<IncompleteArrayType>(AT)) { 4139 // Incomplete arrays are encoded as a pointer to the array element. 4140 S += '^'; 4141 4142 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4143 false, ExpandStructures, FD); 4144 } else { 4145 S += '['; 4146 4147 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 4148 S += llvm::utostr(CAT->getSize().getZExtValue()); 4149 else { 4150 //Variable length arrays are encoded as a regular array with 0 elements. 4151 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 4152 S += '0'; 4153 } 4154 4155 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4156 false, ExpandStructures, FD); 4157 S += ']'; 4158 } 4159 return; 4160 } 4161 4162 if (T->getAs<FunctionType>()) { 4163 S += '?'; 4164 return; 4165 } 4166 4167 if (const RecordType *RTy = T->getAs<RecordType>()) { 4168 RecordDecl *RDecl = RTy->getDecl(); 4169 S += RDecl->isUnion() ? '(' : '{'; 4170 // Anonymous structures print as '?' 4171 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 4172 S += II->getName(); 4173 if (ClassTemplateSpecializationDecl *Spec 4174 = dyn_cast<ClassTemplateSpecializationDecl>(RDecl)) { 4175 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 4176 std::string TemplateArgsStr 4177 = TemplateSpecializationType::PrintTemplateArgumentList( 4178 TemplateArgs.data(), 4179 TemplateArgs.size(), 4180 (*this).PrintingPolicy); 4181 4182 S += TemplateArgsStr; 4183 } 4184 } else { 4185 S += '?'; 4186 } 4187 if (ExpandStructures) { 4188 S += '='; 4189 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 4190 FieldEnd = RDecl->field_end(); 4191 Field != FieldEnd; ++Field) { 4192 if (FD) { 4193 S += '"'; 4194 S += Field->getNameAsString(); 4195 S += '"'; 4196 } 4197 4198 // Special case bit-fields. 4199 if (Field->isBitField()) { 4200 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 4201 (*Field)); 4202 } else { 4203 QualType qt = Field->getType(); 4204 getLegacyIntegralTypeEncoding(qt); 4205 getObjCEncodingForTypeImpl(qt, S, false, true, 4206 FD); 4207 } 4208 } 4209 } 4210 S += RDecl->isUnion() ? ')' : '}'; 4211 return; 4212 } 4213 4214 if (T->isEnumeralType()) { 4215 if (FD && FD->isBitField()) 4216 EncodeBitField(this, S, T, FD); 4217 else 4218 S += 'i'; 4219 return; 4220 } 4221 4222 if (T->isBlockPointerType()) { 4223 S += "@?"; // Unlike a pointer-to-function, which is "^?". 4224 return; 4225 } 4226 4227 // Ignore protocol qualifiers when mangling at this level. 4228 if (const ObjCObjectType *OT = T->getAs<ObjCObjectType>()) 4229 T = OT->getBaseType(); 4230 4231 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 4232 // @encode(class_name) 4233 ObjCInterfaceDecl *OI = OIT->getDecl(); 4234 S += '{'; 4235 const IdentifierInfo *II = OI->getIdentifier(); 4236 S += II->getName(); 4237 S += '='; 4238 llvm::SmallVector<ObjCIvarDecl*, 32> Ivars; 4239 DeepCollectObjCIvars(OI, true, Ivars); 4240 for (unsigned i = 0, e = Ivars.size(); i != e; ++i) { 4241 FieldDecl *Field = cast<FieldDecl>(Ivars[i]); 4242 if (Field->isBitField()) 4243 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, Field); 4244 else 4245 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, FD); 4246 } 4247 S += '}'; 4248 return; 4249 } 4250 4251 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 4252 if (OPT->isObjCIdType()) { 4253 S += '@'; 4254 return; 4255 } 4256 4257 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 4258 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 4259 // Since this is a binary compatibility issue, need to consult with runtime 4260 // folks. Fortunately, this is a *very* obsure construct. 4261 S += '#'; 4262 return; 4263 } 4264 4265 if (OPT->isObjCQualifiedIdType()) { 4266 getObjCEncodingForTypeImpl(getObjCIdType(), S, 4267 ExpandPointedToStructures, 4268 ExpandStructures, FD); 4269 if (FD || EncodingProperty) { 4270 // Note that we do extended encoding of protocol qualifer list 4271 // Only when doing ivar or property encoding. 4272 S += '"'; 4273 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4274 E = OPT->qual_end(); I != E; ++I) { 4275 S += '<'; 4276 S += (*I)->getNameAsString(); 4277 S += '>'; 4278 } 4279 S += '"'; 4280 } 4281 return; 4282 } 4283 4284 QualType PointeeTy = OPT->getPointeeType(); 4285 if (!EncodingProperty && 4286 isa<TypedefType>(PointeeTy.getTypePtr())) { 4287 // Another historical/compatibility reason. 4288 // We encode the underlying type which comes out as 4289 // {...}; 4290 S += '^'; 4291 getObjCEncodingForTypeImpl(PointeeTy, S, 4292 false, ExpandPointedToStructures, 4293 NULL); 4294 return; 4295 } 4296 4297 S += '@'; 4298 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 4299 S += '"'; 4300 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 4301 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4302 E = OPT->qual_end(); I != E; ++I) { 4303 S += '<'; 4304 S += (*I)->getNameAsString(); 4305 S += '>'; 4306 } 4307 S += '"'; 4308 } 4309 return; 4310 } 4311 4312 // gcc just blithely ignores member pointers. 4313 // TODO: maybe there should be a mangling for these 4314 if (T->getAs<MemberPointerType>()) 4315 return; 4316 4317 if (T->isVectorType()) { 4318 // This matches gcc's encoding, even though technically it is 4319 // insufficient. 4320 // FIXME. We should do a better job than gcc. 4321 return; 4322 } 4323 4324 assert(0 && "@encode for type not implemented!"); 4325} 4326 4327void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 4328 std::string& S) const { 4329 if (QT & Decl::OBJC_TQ_In) 4330 S += 'n'; 4331 if (QT & Decl::OBJC_TQ_Inout) 4332 S += 'N'; 4333 if (QT & Decl::OBJC_TQ_Out) 4334 S += 'o'; 4335 if (QT & Decl::OBJC_TQ_Bycopy) 4336 S += 'O'; 4337 if (QT & Decl::OBJC_TQ_Byref) 4338 S += 'R'; 4339 if (QT & Decl::OBJC_TQ_Oneway) 4340 S += 'V'; 4341} 4342 4343void ASTContext::setBuiltinVaListType(QualType T) { 4344 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 4345 4346 BuiltinVaListType = T; 4347} 4348 4349void ASTContext::setObjCIdType(QualType T) { 4350 ObjCIdTypedefType = T; 4351} 4352 4353void ASTContext::setObjCSelType(QualType T) { 4354 ObjCSelTypedefType = T; 4355} 4356 4357void ASTContext::setObjCProtoType(QualType QT) { 4358 ObjCProtoType = QT; 4359} 4360 4361void ASTContext::setObjCClassType(QualType T) { 4362 ObjCClassTypedefType = T; 4363} 4364 4365void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 4366 assert(ObjCConstantStringType.isNull() && 4367 "'NSConstantString' type already set!"); 4368 4369 ObjCConstantStringType = getObjCInterfaceType(Decl); 4370} 4371 4372/// \brief Retrieve the template name that corresponds to a non-empty 4373/// lookup. 4374TemplateName 4375ASTContext::getOverloadedTemplateName(UnresolvedSetIterator Begin, 4376 UnresolvedSetIterator End) const { 4377 unsigned size = End - Begin; 4378 assert(size > 1 && "set is not overloaded!"); 4379 4380 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 4381 size * sizeof(FunctionTemplateDecl*)); 4382 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 4383 4384 NamedDecl **Storage = OT->getStorage(); 4385 for (UnresolvedSetIterator I = Begin; I != End; ++I) { 4386 NamedDecl *D = *I; 4387 assert(isa<FunctionTemplateDecl>(D) || 4388 (isa<UsingShadowDecl>(D) && 4389 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 4390 *Storage++ = D; 4391 } 4392 4393 return TemplateName(OT); 4394} 4395 4396/// \brief Retrieve the template name that represents a qualified 4397/// template name such as \c std::vector. 4398TemplateName 4399ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 4400 bool TemplateKeyword, 4401 TemplateDecl *Template) const { 4402 // FIXME: Canonicalization? 4403 llvm::FoldingSetNodeID ID; 4404 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 4405 4406 void *InsertPos = 0; 4407 QualifiedTemplateName *QTN = 4408 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4409 if (!QTN) { 4410 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 4411 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 4412 } 4413 4414 return TemplateName(QTN); 4415} 4416 4417/// \brief Retrieve the template name that represents a dependent 4418/// template name such as \c MetaFun::template apply. 4419TemplateName 4420ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4421 const IdentifierInfo *Name) const { 4422 assert((!NNS || NNS->isDependent()) && 4423 "Nested name specifier must be dependent"); 4424 4425 llvm::FoldingSetNodeID ID; 4426 DependentTemplateName::Profile(ID, NNS, Name); 4427 4428 void *InsertPos = 0; 4429 DependentTemplateName *QTN = 4430 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4431 4432 if (QTN) 4433 return TemplateName(QTN); 4434 4435 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4436 if (CanonNNS == NNS) { 4437 QTN = new (*this,4) DependentTemplateName(NNS, Name); 4438 } else { 4439 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 4440 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 4441 DependentTemplateName *CheckQTN = 4442 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4443 assert(!CheckQTN && "Dependent type name canonicalization broken"); 4444 (void)CheckQTN; 4445 } 4446 4447 DependentTemplateNames.InsertNode(QTN, InsertPos); 4448 return TemplateName(QTN); 4449} 4450 4451/// \brief Retrieve the template name that represents a dependent 4452/// template name such as \c MetaFun::template operator+. 4453TemplateName 4454ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4455 OverloadedOperatorKind Operator) const { 4456 assert((!NNS || NNS->isDependent()) && 4457 "Nested name specifier must be dependent"); 4458 4459 llvm::FoldingSetNodeID ID; 4460 DependentTemplateName::Profile(ID, NNS, Operator); 4461 4462 void *InsertPos = 0; 4463 DependentTemplateName *QTN 4464 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4465 4466 if (QTN) 4467 return TemplateName(QTN); 4468 4469 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4470 if (CanonNNS == NNS) { 4471 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 4472 } else { 4473 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 4474 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 4475 4476 DependentTemplateName *CheckQTN 4477 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4478 assert(!CheckQTN && "Dependent template name canonicalization broken"); 4479 (void)CheckQTN; 4480 } 4481 4482 DependentTemplateNames.InsertNode(QTN, InsertPos); 4483 return TemplateName(QTN); 4484} 4485 4486TemplateName 4487ASTContext::getSubstTemplateTemplateParmPack(TemplateTemplateParmDecl *Param, 4488 const TemplateArgument &ArgPack) const { 4489 ASTContext &Self = const_cast<ASTContext &>(*this); 4490 llvm::FoldingSetNodeID ID; 4491 SubstTemplateTemplateParmPackStorage::Profile(ID, Self, Param, ArgPack); 4492 4493 void *InsertPos = 0; 4494 SubstTemplateTemplateParmPackStorage *Subst 4495 = SubstTemplateTemplateParmPacks.FindNodeOrInsertPos(ID, InsertPos); 4496 4497 if (!Subst) { 4498 Subst = new (*this) SubstTemplateTemplateParmPackStorage(Self, Param, 4499 ArgPack.pack_size(), 4500 ArgPack.pack_begin()); 4501 SubstTemplateTemplateParmPacks.InsertNode(Subst, InsertPos); 4502 } 4503 4504 return TemplateName(Subst); 4505} 4506 4507/// getFromTargetType - Given one of the integer types provided by 4508/// TargetInfo, produce the corresponding type. The unsigned @p Type 4509/// is actually a value of type @c TargetInfo::IntType. 4510CanQualType ASTContext::getFromTargetType(unsigned Type) const { 4511 switch (Type) { 4512 case TargetInfo::NoInt: return CanQualType(); 4513 case TargetInfo::SignedShort: return ShortTy; 4514 case TargetInfo::UnsignedShort: return UnsignedShortTy; 4515 case TargetInfo::SignedInt: return IntTy; 4516 case TargetInfo::UnsignedInt: return UnsignedIntTy; 4517 case TargetInfo::SignedLong: return LongTy; 4518 case TargetInfo::UnsignedLong: return UnsignedLongTy; 4519 case TargetInfo::SignedLongLong: return LongLongTy; 4520 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 4521 } 4522 4523 assert(false && "Unhandled TargetInfo::IntType value"); 4524 return CanQualType(); 4525} 4526 4527//===----------------------------------------------------------------------===// 4528// Type Predicates. 4529//===----------------------------------------------------------------------===// 4530 4531/// isObjCNSObjectType - Return true if this is an NSObject object using 4532/// NSObject attribute on a c-style pointer type. 4533/// FIXME - Make it work directly on types. 4534/// FIXME: Move to Type. 4535/// 4536bool ASTContext::isObjCNSObjectType(QualType Ty) const { 4537 if (const TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 4538 if (TypedefDecl *TD = TDT->getDecl()) 4539 if (TD->getAttr<ObjCNSObjectAttr>()) 4540 return true; 4541 } 4542 return false; 4543} 4544 4545/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 4546/// garbage collection attribute. 4547/// 4548Qualifiers::GC ASTContext::getObjCGCAttrKind(QualType Ty) const { 4549 if (getLangOptions().getGCMode() == LangOptions::NonGC) 4550 return Qualifiers::GCNone; 4551 4552 assert(getLangOptions().ObjC1); 4553 Qualifiers::GC GCAttrs = Ty.getObjCGCAttr(); 4554 4555 // Default behaviour under objective-C's gc is for ObjC pointers 4556 // (or pointers to them) be treated as though they were declared 4557 // as __strong. 4558 if (GCAttrs == Qualifiers::GCNone) { 4559 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 4560 return Qualifiers::Strong; 4561 else if (Ty->isPointerType()) 4562 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 4563 } else { 4564 // It's not valid to set GC attributes on anything that isn't a 4565 // pointer. 4566#ifndef NDEBUG 4567 QualType CT = Ty->getCanonicalTypeInternal(); 4568 while (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 4569 CT = AT->getElementType(); 4570 assert(CT->isAnyPointerType() || CT->isBlockPointerType()); 4571#endif 4572 } 4573 return GCAttrs; 4574} 4575 4576//===----------------------------------------------------------------------===// 4577// Type Compatibility Testing 4578//===----------------------------------------------------------------------===// 4579 4580/// areCompatVectorTypes - Return true if the two specified vector types are 4581/// compatible. 4582static bool areCompatVectorTypes(const VectorType *LHS, 4583 const VectorType *RHS) { 4584 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 4585 return LHS->getElementType() == RHS->getElementType() && 4586 LHS->getNumElements() == RHS->getNumElements(); 4587} 4588 4589bool ASTContext::areCompatibleVectorTypes(QualType FirstVec, 4590 QualType SecondVec) { 4591 assert(FirstVec->isVectorType() && "FirstVec should be a vector type"); 4592 assert(SecondVec->isVectorType() && "SecondVec should be a vector type"); 4593 4594 if (hasSameUnqualifiedType(FirstVec, SecondVec)) 4595 return true; 4596 4597 // Treat Neon vector types and most AltiVec vector types as if they are the 4598 // equivalent GCC vector types. 4599 const VectorType *First = FirstVec->getAs<VectorType>(); 4600 const VectorType *Second = SecondVec->getAs<VectorType>(); 4601 if (First->getNumElements() == Second->getNumElements() && 4602 hasSameType(First->getElementType(), Second->getElementType()) && 4603 First->getVectorKind() != VectorType::AltiVecPixel && 4604 First->getVectorKind() != VectorType::AltiVecBool && 4605 Second->getVectorKind() != VectorType::AltiVecPixel && 4606 Second->getVectorKind() != VectorType::AltiVecBool) 4607 return true; 4608 4609 return false; 4610} 4611 4612//===----------------------------------------------------------------------===// 4613// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 4614//===----------------------------------------------------------------------===// 4615 4616/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 4617/// inheritance hierarchy of 'rProto'. 4618bool 4619ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 4620 ObjCProtocolDecl *rProto) const { 4621 if (lProto == rProto) 4622 return true; 4623 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 4624 E = rProto->protocol_end(); PI != E; ++PI) 4625 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 4626 return true; 4627 return false; 4628} 4629 4630/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 4631/// return true if lhs's protocols conform to rhs's protocol; false 4632/// otherwise. 4633bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 4634 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 4635 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 4636 return false; 4637} 4638 4639/// ObjCQualifiedClassTypesAreCompatible - compare Class<p,...> and 4640/// Class<p1, ...>. 4641bool ASTContext::ObjCQualifiedClassTypesAreCompatible(QualType lhs, 4642 QualType rhs) { 4643 const ObjCObjectPointerType *lhsQID = lhs->getAs<ObjCObjectPointerType>(); 4644 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4645 assert ((lhsQID && rhsOPT) && "ObjCQualifiedClassTypesAreCompatible"); 4646 4647 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4648 E = lhsQID->qual_end(); I != E; ++I) { 4649 bool match = false; 4650 ObjCProtocolDecl *lhsProto = *I; 4651 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4652 E = rhsOPT->qual_end(); J != E; ++J) { 4653 ObjCProtocolDecl *rhsProto = *J; 4654 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto)) { 4655 match = true; 4656 break; 4657 } 4658 } 4659 if (!match) 4660 return false; 4661 } 4662 return true; 4663} 4664 4665/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 4666/// ObjCQualifiedIDType. 4667bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 4668 bool compare) { 4669 // Allow id<P..> and an 'id' or void* type in all cases. 4670 if (lhs->isVoidPointerType() || 4671 lhs->isObjCIdType() || lhs->isObjCClassType()) 4672 return true; 4673 else if (rhs->isVoidPointerType() || 4674 rhs->isObjCIdType() || rhs->isObjCClassType()) 4675 return true; 4676 4677 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 4678 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4679 4680 if (!rhsOPT) return false; 4681 4682 if (rhsOPT->qual_empty()) { 4683 // If the RHS is a unqualified interface pointer "NSString*", 4684 // make sure we check the class hierarchy. 4685 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4686 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4687 E = lhsQID->qual_end(); I != E; ++I) { 4688 // when comparing an id<P> on lhs with a static type on rhs, 4689 // see if static class implements all of id's protocols, directly or 4690 // through its super class and categories. 4691 if (!rhsID->ClassImplementsProtocol(*I, true)) 4692 return false; 4693 } 4694 } 4695 // If there are no qualifiers and no interface, we have an 'id'. 4696 return true; 4697 } 4698 // Both the right and left sides have qualifiers. 4699 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4700 E = lhsQID->qual_end(); I != E; ++I) { 4701 ObjCProtocolDecl *lhsProto = *I; 4702 bool match = false; 4703 4704 // when comparing an id<P> on lhs with a static type on rhs, 4705 // see if static class implements all of id's protocols, directly or 4706 // through its super class and categories. 4707 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4708 E = rhsOPT->qual_end(); J != E; ++J) { 4709 ObjCProtocolDecl *rhsProto = *J; 4710 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4711 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4712 match = true; 4713 break; 4714 } 4715 } 4716 // If the RHS is a qualified interface pointer "NSString<P>*", 4717 // make sure we check the class hierarchy. 4718 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4719 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4720 E = lhsQID->qual_end(); I != E; ++I) { 4721 // when comparing an id<P> on lhs with a static type on rhs, 4722 // see if static class implements all of id's protocols, directly or 4723 // through its super class and categories. 4724 if (rhsID->ClassImplementsProtocol(*I, true)) { 4725 match = true; 4726 break; 4727 } 4728 } 4729 } 4730 if (!match) 4731 return false; 4732 } 4733 4734 return true; 4735 } 4736 4737 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 4738 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 4739 4740 if (const ObjCObjectPointerType *lhsOPT = 4741 lhs->getAsObjCInterfacePointerType()) { 4742 // If both the right and left sides have qualifiers. 4743 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 4744 E = lhsOPT->qual_end(); I != E; ++I) { 4745 ObjCProtocolDecl *lhsProto = *I; 4746 bool match = false; 4747 4748 // when comparing an id<P> on rhs with a static type on lhs, 4749 // see if static class implements all of id's protocols, directly or 4750 // through its super class and categories. 4751 // First, lhs protocols in the qualifier list must be found, direct 4752 // or indirect in rhs's qualifier list or it is a mismatch. 4753 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4754 E = rhsQID->qual_end(); J != E; ++J) { 4755 ObjCProtocolDecl *rhsProto = *J; 4756 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4757 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4758 match = true; 4759 break; 4760 } 4761 } 4762 if (!match) 4763 return false; 4764 } 4765 4766 // Static class's protocols, or its super class or category protocols 4767 // must be found, direct or indirect in rhs's qualifier list or it is a mismatch. 4768 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 4769 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4770 CollectInheritedProtocols(lhsID, LHSInheritedProtocols); 4771 // This is rather dubious but matches gcc's behavior. If lhs has 4772 // no type qualifier and its class has no static protocol(s) 4773 // assume that it is mismatch. 4774 if (LHSInheritedProtocols.empty() && lhsOPT->qual_empty()) 4775 return false; 4776 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4777 LHSInheritedProtocols.begin(), 4778 E = LHSInheritedProtocols.end(); I != E; ++I) { 4779 bool match = false; 4780 ObjCProtocolDecl *lhsProto = (*I); 4781 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4782 E = rhsQID->qual_end(); J != E; ++J) { 4783 ObjCProtocolDecl *rhsProto = *J; 4784 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4785 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4786 match = true; 4787 break; 4788 } 4789 } 4790 if (!match) 4791 return false; 4792 } 4793 } 4794 return true; 4795 } 4796 return false; 4797} 4798 4799/// canAssignObjCInterfaces - Return true if the two interface types are 4800/// compatible for assignment from RHS to LHS. This handles validation of any 4801/// protocol qualifiers on the LHS or RHS. 4802/// 4803bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4804 const ObjCObjectPointerType *RHSOPT) { 4805 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4806 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4807 4808 // If either type represents the built-in 'id' or 'Class' types, return true. 4809 if (LHS->isObjCUnqualifiedIdOrClass() || 4810 RHS->isObjCUnqualifiedIdOrClass()) 4811 return true; 4812 4813 if (LHS->isObjCQualifiedId() || RHS->isObjCQualifiedId()) 4814 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4815 QualType(RHSOPT,0), 4816 false); 4817 4818 if (LHS->isObjCQualifiedClass() && RHS->isObjCQualifiedClass()) 4819 return ObjCQualifiedClassTypesAreCompatible(QualType(LHSOPT,0), 4820 QualType(RHSOPT,0)); 4821 4822 // If we have 2 user-defined types, fall into that path. 4823 if (LHS->getInterface() && RHS->getInterface()) 4824 return canAssignObjCInterfaces(LHS, RHS); 4825 4826 return false; 4827} 4828 4829/// canAssignObjCInterfacesInBlockPointer - This routine is specifically written 4830/// for providing type-safty for objective-c pointers used to pass/return 4831/// arguments in block literals. When passed as arguments, passing 'A*' where 4832/// 'id' is expected is not OK. Passing 'Sub *" where 'Super *" is expected is 4833/// not OK. For the return type, the opposite is not OK. 4834bool ASTContext::canAssignObjCInterfacesInBlockPointer( 4835 const ObjCObjectPointerType *LHSOPT, 4836 const ObjCObjectPointerType *RHSOPT) { 4837 if (RHSOPT->isObjCBuiltinType() || LHSOPT->isObjCIdType()) 4838 return true; 4839 4840 if (LHSOPT->isObjCBuiltinType()) { 4841 return RHSOPT->isObjCBuiltinType() || RHSOPT->isObjCQualifiedIdType(); 4842 } 4843 4844 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4845 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4846 QualType(RHSOPT,0), 4847 false); 4848 4849 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4850 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4851 if (LHS && RHS) { // We have 2 user-defined types. 4852 if (LHS != RHS) { 4853 if (LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4854 return false; 4855 if (RHS->getDecl()->isSuperClassOf(LHS->getDecl())) 4856 return true; 4857 } 4858 else 4859 return true; 4860 } 4861 return false; 4862} 4863 4864/// getIntersectionOfProtocols - This routine finds the intersection of set 4865/// of protocols inherited from two distinct objective-c pointer objects. 4866/// It is used to build composite qualifier list of the composite type of 4867/// the conditional expression involving two objective-c pointer objects. 4868static 4869void getIntersectionOfProtocols(ASTContext &Context, 4870 const ObjCObjectPointerType *LHSOPT, 4871 const ObjCObjectPointerType *RHSOPT, 4872 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4873 4874 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4875 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4876 assert(LHS->getInterface() && "LHS must have an interface base"); 4877 assert(RHS->getInterface() && "RHS must have an interface base"); 4878 4879 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4880 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4881 if (LHSNumProtocols > 0) 4882 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4883 else { 4884 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4885 Context.CollectInheritedProtocols(LHS->getInterface(), 4886 LHSInheritedProtocols); 4887 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4888 LHSInheritedProtocols.end()); 4889 } 4890 4891 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4892 if (RHSNumProtocols > 0) { 4893 ObjCProtocolDecl **RHSProtocols = 4894 const_cast<ObjCProtocolDecl **>(RHS->qual_begin()); 4895 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4896 if (InheritedProtocolSet.count(RHSProtocols[i])) 4897 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4898 } 4899 else { 4900 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4901 Context.CollectInheritedProtocols(RHS->getInterface(), 4902 RHSInheritedProtocols); 4903 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4904 RHSInheritedProtocols.begin(), 4905 E = RHSInheritedProtocols.end(); I != E; ++I) 4906 if (InheritedProtocolSet.count((*I))) 4907 IntersectionOfProtocols.push_back((*I)); 4908 } 4909} 4910 4911/// areCommonBaseCompatible - Returns common base class of the two classes if 4912/// one found. Note that this is O'2 algorithm. But it will be called as the 4913/// last type comparison in a ?-exp of ObjC pointer types before a 4914/// warning is issued. So, its invokation is extremely rare. 4915QualType ASTContext::areCommonBaseCompatible( 4916 const ObjCObjectPointerType *Lptr, 4917 const ObjCObjectPointerType *Rptr) { 4918 const ObjCObjectType *LHS = Lptr->getObjectType(); 4919 const ObjCObjectType *RHS = Rptr->getObjectType(); 4920 const ObjCInterfaceDecl* LDecl = LHS->getInterface(); 4921 const ObjCInterfaceDecl* RDecl = RHS->getInterface(); 4922 if (!LDecl || !RDecl) 4923 return QualType(); 4924 4925 while ((LDecl = LDecl->getSuperClass())) { 4926 LHS = cast<ObjCInterfaceType>(getObjCInterfaceType(LDecl)); 4927 if (canAssignObjCInterfaces(LHS, RHS)) { 4928 llvm::SmallVector<ObjCProtocolDecl *, 8> Protocols; 4929 getIntersectionOfProtocols(*this, Lptr, Rptr, Protocols); 4930 4931 QualType Result = QualType(LHS, 0); 4932 if (!Protocols.empty()) 4933 Result = getObjCObjectType(Result, Protocols.data(), Protocols.size()); 4934 Result = getObjCObjectPointerType(Result); 4935 return Result; 4936 } 4937 } 4938 4939 return QualType(); 4940} 4941 4942bool ASTContext::canAssignObjCInterfaces(const ObjCObjectType *LHS, 4943 const ObjCObjectType *RHS) { 4944 assert(LHS->getInterface() && "LHS is not an interface type"); 4945 assert(RHS->getInterface() && "RHS is not an interface type"); 4946 4947 // Verify that the base decls are compatible: the RHS must be a subclass of 4948 // the LHS. 4949 if (!LHS->getInterface()->isSuperClassOf(RHS->getInterface())) 4950 return false; 4951 4952 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4953 // protocol qualified at all, then we are good. 4954 if (LHS->getNumProtocols() == 0) 4955 return true; 4956 4957 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4958 // isn't a superset. 4959 if (RHS->getNumProtocols() == 0) 4960 return true; // FIXME: should return false! 4961 4962 for (ObjCObjectType::qual_iterator LHSPI = LHS->qual_begin(), 4963 LHSPE = LHS->qual_end(); 4964 LHSPI != LHSPE; LHSPI++) { 4965 bool RHSImplementsProtocol = false; 4966 4967 // If the RHS doesn't implement the protocol on the left, the types 4968 // are incompatible. 4969 for (ObjCObjectType::qual_iterator RHSPI = RHS->qual_begin(), 4970 RHSPE = RHS->qual_end(); 4971 RHSPI != RHSPE; RHSPI++) { 4972 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4973 RHSImplementsProtocol = true; 4974 break; 4975 } 4976 } 4977 // FIXME: For better diagnostics, consider passing back the protocol name. 4978 if (!RHSImplementsProtocol) 4979 return false; 4980 } 4981 // The RHS implements all protocols listed on the LHS. 4982 return true; 4983} 4984 4985bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4986 // get the "pointed to" types 4987 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4988 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4989 4990 if (!LHSOPT || !RHSOPT) 4991 return false; 4992 4993 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4994 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4995} 4996 4997bool ASTContext::canBindObjCObjectType(QualType To, QualType From) { 4998 return canAssignObjCInterfaces( 4999 getObjCObjectPointerType(To)->getAs<ObjCObjectPointerType>(), 5000 getObjCObjectPointerType(From)->getAs<ObjCObjectPointerType>()); 5001} 5002 5003/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 5004/// both shall have the identically qualified version of a compatible type. 5005/// C99 6.2.7p1: Two types have compatible types if their types are the 5006/// same. See 6.7.[2,3,5] for additional rules. 5007bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS, 5008 bool CompareUnqualified) { 5009 if (getLangOptions().CPlusPlus) 5010 return hasSameType(LHS, RHS); 5011 5012 return !mergeTypes(LHS, RHS, false, CompareUnqualified).isNull(); 5013} 5014 5015bool ASTContext::typesAreBlockPointerCompatible(QualType LHS, QualType RHS) { 5016 return !mergeTypes(LHS, RHS, true).isNull(); 5017} 5018 5019/// mergeTransparentUnionType - if T is a transparent union type and a member 5020/// of T is compatible with SubType, return the merged type, else return 5021/// QualType() 5022QualType ASTContext::mergeTransparentUnionType(QualType T, QualType SubType, 5023 bool OfBlockPointer, 5024 bool Unqualified) { 5025 if (const RecordType *UT = T->getAsUnionType()) { 5026 RecordDecl *UD = UT->getDecl(); 5027 if (UD->hasAttr<TransparentUnionAttr>()) { 5028 for (RecordDecl::field_iterator it = UD->field_begin(), 5029 itend = UD->field_end(); it != itend; ++it) { 5030 QualType ET = it->getType().getUnqualifiedType(); 5031 QualType MT = mergeTypes(ET, SubType, OfBlockPointer, Unqualified); 5032 if (!MT.isNull()) 5033 return MT; 5034 } 5035 } 5036 } 5037 5038 return QualType(); 5039} 5040 5041/// mergeFunctionArgumentTypes - merge two types which appear as function 5042/// argument types 5043QualType ASTContext::mergeFunctionArgumentTypes(QualType lhs, QualType rhs, 5044 bool OfBlockPointer, 5045 bool Unqualified) { 5046 // GNU extension: two types are compatible if they appear as a function 5047 // argument, one of the types is a transparent union type and the other 5048 // type is compatible with a union member 5049 QualType lmerge = mergeTransparentUnionType(lhs, rhs, OfBlockPointer, 5050 Unqualified); 5051 if (!lmerge.isNull()) 5052 return lmerge; 5053 5054 QualType rmerge = mergeTransparentUnionType(rhs, lhs, OfBlockPointer, 5055 Unqualified); 5056 if (!rmerge.isNull()) 5057 return rmerge; 5058 5059 return mergeTypes(lhs, rhs, OfBlockPointer, Unqualified); 5060} 5061 5062QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs, 5063 bool OfBlockPointer, 5064 bool Unqualified) { 5065 const FunctionType *lbase = lhs->getAs<FunctionType>(); 5066 const FunctionType *rbase = rhs->getAs<FunctionType>(); 5067 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 5068 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 5069 bool allLTypes = true; 5070 bool allRTypes = true; 5071 5072 // Check return type 5073 QualType retType; 5074 if (OfBlockPointer) 5075 retType = mergeTypes(rbase->getResultType(), lbase->getResultType(), true, 5076 Unqualified); 5077 else 5078 retType = mergeTypes(lbase->getResultType(), rbase->getResultType(), false, 5079 Unqualified); 5080 if (retType.isNull()) return QualType(); 5081 5082 if (Unqualified) 5083 retType = retType.getUnqualifiedType(); 5084 5085 CanQualType LRetType = getCanonicalType(lbase->getResultType()); 5086 CanQualType RRetType = getCanonicalType(rbase->getResultType()); 5087 if (Unqualified) { 5088 LRetType = LRetType.getUnqualifiedType(); 5089 RRetType = RRetType.getUnqualifiedType(); 5090 } 5091 5092 if (getCanonicalType(retType) != LRetType) 5093 allLTypes = false; 5094 if (getCanonicalType(retType) != RRetType) 5095 allRTypes = false; 5096 5097 // FIXME: double check this 5098 // FIXME: should we error if lbase->getRegParmAttr() != 0 && 5099 // rbase->getRegParmAttr() != 0 && 5100 // lbase->getRegParmAttr() != rbase->getRegParmAttr()? 5101 FunctionType::ExtInfo lbaseInfo = lbase->getExtInfo(); 5102 FunctionType::ExtInfo rbaseInfo = rbase->getExtInfo(); 5103 5104 // Compatible functions must have compatible calling conventions 5105 if (!isSameCallConv(lbaseInfo.getCC(), rbaseInfo.getCC())) 5106 return QualType(); 5107 5108 // Regparm is part of the calling convention. 5109 if (lbaseInfo.getRegParm() != rbaseInfo.getRegParm()) 5110 return QualType(); 5111 5112 // It's noreturn if either type is. 5113 // FIXME: some uses, e.g. conditional exprs, really want this to be 'both'. 5114 bool NoReturn = lbaseInfo.getNoReturn() || rbaseInfo.getNoReturn(); 5115 if (NoReturn != lbaseInfo.getNoReturn()) 5116 allLTypes = false; 5117 if (NoReturn != rbaseInfo.getNoReturn()) 5118 allRTypes = false; 5119 5120 FunctionType::ExtInfo einfo(NoReturn, 5121 lbaseInfo.getRegParm(), 5122 lbaseInfo.getCC()); 5123 5124 if (lproto && rproto) { // two C99 style function prototypes 5125 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 5126 "C++ shouldn't be here"); 5127 unsigned lproto_nargs = lproto->getNumArgs(); 5128 unsigned rproto_nargs = rproto->getNumArgs(); 5129 5130 // Compatible functions must have the same number of arguments 5131 if (lproto_nargs != rproto_nargs) 5132 return QualType(); 5133 5134 // Variadic and non-variadic functions aren't compatible 5135 if (lproto->isVariadic() != rproto->isVariadic()) 5136 return QualType(); 5137 5138 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 5139 return QualType(); 5140 5141 // Check argument compatibility 5142 llvm::SmallVector<QualType, 10> types; 5143 for (unsigned i = 0; i < lproto_nargs; i++) { 5144 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 5145 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 5146 QualType argtype = mergeFunctionArgumentTypes(largtype, rargtype, 5147 OfBlockPointer, 5148 Unqualified); 5149 if (argtype.isNull()) return QualType(); 5150 5151 if (Unqualified) 5152 argtype = argtype.getUnqualifiedType(); 5153 5154 types.push_back(argtype); 5155 if (Unqualified) { 5156 largtype = largtype.getUnqualifiedType(); 5157 rargtype = rargtype.getUnqualifiedType(); 5158 } 5159 5160 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 5161 allLTypes = false; 5162 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 5163 allRTypes = false; 5164 } 5165 if (allLTypes) return lhs; 5166 if (allRTypes) return rhs; 5167 5168 FunctionProtoType::ExtProtoInfo EPI = lproto->getExtProtoInfo(); 5169 EPI.ExtInfo = einfo; 5170 return getFunctionType(retType, types.begin(), types.size(), EPI); 5171 } 5172 5173 if (lproto) allRTypes = false; 5174 if (rproto) allLTypes = false; 5175 5176 const FunctionProtoType *proto = lproto ? lproto : rproto; 5177 if (proto) { 5178 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 5179 if (proto->isVariadic()) return QualType(); 5180 // Check that the types are compatible with the types that 5181 // would result from default argument promotions (C99 6.7.5.3p15). 5182 // The only types actually affected are promotable integer 5183 // types and floats, which would be passed as a different 5184 // type depending on whether the prototype is visible. 5185 unsigned proto_nargs = proto->getNumArgs(); 5186 for (unsigned i = 0; i < proto_nargs; ++i) { 5187 QualType argTy = proto->getArgType(i); 5188 5189 // Look at the promotion type of enum types, since that is the type used 5190 // to pass enum values. 5191 if (const EnumType *Enum = argTy->getAs<EnumType>()) 5192 argTy = Enum->getDecl()->getPromotionType(); 5193 5194 if (argTy->isPromotableIntegerType() || 5195 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 5196 return QualType(); 5197 } 5198 5199 if (allLTypes) return lhs; 5200 if (allRTypes) return rhs; 5201 5202 FunctionProtoType::ExtProtoInfo EPI = proto->getExtProtoInfo(); 5203 EPI.ExtInfo = einfo; 5204 return getFunctionType(retType, proto->arg_type_begin(), 5205 proto->getNumArgs(), EPI); 5206 } 5207 5208 if (allLTypes) return lhs; 5209 if (allRTypes) return rhs; 5210 return getFunctionNoProtoType(retType, einfo); 5211} 5212 5213QualType ASTContext::mergeTypes(QualType LHS, QualType RHS, 5214 bool OfBlockPointer, 5215 bool Unqualified) { 5216 // C++ [expr]: If an expression initially has the type "reference to T", the 5217 // type is adjusted to "T" prior to any further analysis, the expression 5218 // designates the object or function denoted by the reference, and the 5219 // expression is an lvalue unless the reference is an rvalue reference and 5220 // the expression is a function call (possibly inside parentheses). 5221 assert(!LHS->getAs<ReferenceType>() && "LHS is a reference type?"); 5222 assert(!RHS->getAs<ReferenceType>() && "RHS is a reference type?"); 5223 5224 if (Unqualified) { 5225 LHS = LHS.getUnqualifiedType(); 5226 RHS = RHS.getUnqualifiedType(); 5227 } 5228 5229 QualType LHSCan = getCanonicalType(LHS), 5230 RHSCan = getCanonicalType(RHS); 5231 5232 // If two types are identical, they are compatible. 5233 if (LHSCan == RHSCan) 5234 return LHS; 5235 5236 // If the qualifiers are different, the types aren't compatible... mostly. 5237 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5238 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5239 if (LQuals != RQuals) { 5240 // If any of these qualifiers are different, we have a type 5241 // mismatch. 5242 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5243 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5244 return QualType(); 5245 5246 // Exactly one GC qualifier difference is allowed: __strong is 5247 // okay if the other type has no GC qualifier but is an Objective 5248 // C object pointer (i.e. implicitly strong by default). We fix 5249 // this by pretending that the unqualified type was actually 5250 // qualified __strong. 5251 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5252 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5253 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5254 5255 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5256 return QualType(); 5257 5258 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 5259 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 5260 } 5261 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 5262 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 5263 } 5264 return QualType(); 5265 } 5266 5267 // Okay, qualifiers are equal. 5268 5269 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 5270 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 5271 5272 // We want to consider the two function types to be the same for these 5273 // comparisons, just force one to the other. 5274 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 5275 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 5276 5277 // Same as above for arrays 5278 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 5279 LHSClass = Type::ConstantArray; 5280 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 5281 RHSClass = Type::ConstantArray; 5282 5283 // ObjCInterfaces are just specialized ObjCObjects. 5284 if (LHSClass == Type::ObjCInterface) LHSClass = Type::ObjCObject; 5285 if (RHSClass == Type::ObjCInterface) RHSClass = Type::ObjCObject; 5286 5287 // Canonicalize ExtVector -> Vector. 5288 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 5289 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 5290 5291 // If the canonical type classes don't match. 5292 if (LHSClass != RHSClass) { 5293 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 5294 // a signed integer type, or an unsigned integer type. 5295 // Compatibility is based on the underlying type, not the promotion 5296 // type. 5297 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 5298 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 5299 return RHS; 5300 } 5301 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 5302 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 5303 return LHS; 5304 } 5305 5306 return QualType(); 5307 } 5308 5309 // The canonical type classes match. 5310 switch (LHSClass) { 5311#define TYPE(Class, Base) 5312#define ABSTRACT_TYPE(Class, Base) 5313#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: 5314#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 5315#define DEPENDENT_TYPE(Class, Base) case Type::Class: 5316#include "clang/AST/TypeNodes.def" 5317 assert(false && "Non-canonical and dependent types shouldn't get here"); 5318 return QualType(); 5319 5320 case Type::LValueReference: 5321 case Type::RValueReference: 5322 case Type::MemberPointer: 5323 assert(false && "C++ should never be in mergeTypes"); 5324 return QualType(); 5325 5326 case Type::ObjCInterface: 5327 case Type::IncompleteArray: 5328 case Type::VariableArray: 5329 case Type::FunctionProto: 5330 case Type::ExtVector: 5331 assert(false && "Types are eliminated above"); 5332 return QualType(); 5333 5334 case Type::Pointer: 5335 { 5336 // Merge two pointer types, while trying to preserve typedef info 5337 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 5338 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 5339 if (Unqualified) { 5340 LHSPointee = LHSPointee.getUnqualifiedType(); 5341 RHSPointee = RHSPointee.getUnqualifiedType(); 5342 } 5343 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, false, 5344 Unqualified); 5345 if (ResultType.isNull()) return QualType(); 5346 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5347 return LHS; 5348 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5349 return RHS; 5350 return getPointerType(ResultType); 5351 } 5352 case Type::BlockPointer: 5353 { 5354 // Merge two block pointer types, while trying to preserve typedef info 5355 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 5356 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 5357 if (Unqualified) { 5358 LHSPointee = LHSPointee.getUnqualifiedType(); 5359 RHSPointee = RHSPointee.getUnqualifiedType(); 5360 } 5361 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, OfBlockPointer, 5362 Unqualified); 5363 if (ResultType.isNull()) return QualType(); 5364 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5365 return LHS; 5366 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5367 return RHS; 5368 return getBlockPointerType(ResultType); 5369 } 5370 case Type::ConstantArray: 5371 { 5372 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 5373 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 5374 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 5375 return QualType(); 5376 5377 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 5378 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 5379 if (Unqualified) { 5380 LHSElem = LHSElem.getUnqualifiedType(); 5381 RHSElem = RHSElem.getUnqualifiedType(); 5382 } 5383 5384 QualType ResultType = mergeTypes(LHSElem, RHSElem, false, Unqualified); 5385 if (ResultType.isNull()) return QualType(); 5386 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5387 return LHS; 5388 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5389 return RHS; 5390 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 5391 ArrayType::ArraySizeModifier(), 0); 5392 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 5393 ArrayType::ArraySizeModifier(), 0); 5394 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 5395 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 5396 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5397 return LHS; 5398 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5399 return RHS; 5400 if (LVAT) { 5401 // FIXME: This isn't correct! But tricky to implement because 5402 // the array's size has to be the size of LHS, but the type 5403 // has to be different. 5404 return LHS; 5405 } 5406 if (RVAT) { 5407 // FIXME: This isn't correct! But tricky to implement because 5408 // the array's size has to be the size of RHS, but the type 5409 // has to be different. 5410 return RHS; 5411 } 5412 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 5413 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 5414 return getIncompleteArrayType(ResultType, 5415 ArrayType::ArraySizeModifier(), 0); 5416 } 5417 case Type::FunctionNoProto: 5418 return mergeFunctionTypes(LHS, RHS, OfBlockPointer, Unqualified); 5419 case Type::Record: 5420 case Type::Enum: 5421 return QualType(); 5422 case Type::Builtin: 5423 // Only exactly equal builtin types are compatible, which is tested above. 5424 return QualType(); 5425 case Type::Complex: 5426 // Distinct complex types are incompatible. 5427 return QualType(); 5428 case Type::Vector: 5429 // FIXME: The merged type should be an ExtVector! 5430 if (areCompatVectorTypes(LHSCan->getAs<VectorType>(), 5431 RHSCan->getAs<VectorType>())) 5432 return LHS; 5433 return QualType(); 5434 case Type::ObjCObject: { 5435 // Check if the types are assignment compatible. 5436 // FIXME: This should be type compatibility, e.g. whether 5437 // "LHS x; RHS x;" at global scope is legal. 5438 const ObjCObjectType* LHSIface = LHS->getAs<ObjCObjectType>(); 5439 const ObjCObjectType* RHSIface = RHS->getAs<ObjCObjectType>(); 5440 if (canAssignObjCInterfaces(LHSIface, RHSIface)) 5441 return LHS; 5442 5443 return QualType(); 5444 } 5445 case Type::ObjCObjectPointer: { 5446 if (OfBlockPointer) { 5447 if (canAssignObjCInterfacesInBlockPointer( 5448 LHS->getAs<ObjCObjectPointerType>(), 5449 RHS->getAs<ObjCObjectPointerType>())) 5450 return LHS; 5451 return QualType(); 5452 } 5453 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 5454 RHS->getAs<ObjCObjectPointerType>())) 5455 return LHS; 5456 5457 return QualType(); 5458 } 5459 } 5460 5461 return QualType(); 5462} 5463 5464/// mergeObjCGCQualifiers - This routine merges ObjC's GC attribute of 'LHS' and 5465/// 'RHS' attributes and returns the merged version; including for function 5466/// return types. 5467QualType ASTContext::mergeObjCGCQualifiers(QualType LHS, QualType RHS) { 5468 QualType LHSCan = getCanonicalType(LHS), 5469 RHSCan = getCanonicalType(RHS); 5470 // If two types are identical, they are compatible. 5471 if (LHSCan == RHSCan) 5472 return LHS; 5473 if (RHSCan->isFunctionType()) { 5474 if (!LHSCan->isFunctionType()) 5475 return QualType(); 5476 QualType OldReturnType = 5477 cast<FunctionType>(RHSCan.getTypePtr())->getResultType(); 5478 QualType NewReturnType = 5479 cast<FunctionType>(LHSCan.getTypePtr())->getResultType(); 5480 QualType ResReturnType = 5481 mergeObjCGCQualifiers(NewReturnType, OldReturnType); 5482 if (ResReturnType.isNull()) 5483 return QualType(); 5484 if (ResReturnType == NewReturnType || ResReturnType == OldReturnType) { 5485 // id foo(); ... __strong id foo(); or: __strong id foo(); ... id foo(); 5486 // In either case, use OldReturnType to build the new function type. 5487 const FunctionType *F = LHS->getAs<FunctionType>(); 5488 if (const FunctionProtoType *FPT = cast<FunctionProtoType>(F)) { 5489 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5490 EPI.ExtInfo = getFunctionExtInfo(LHS); 5491 QualType ResultType 5492 = getFunctionType(OldReturnType, FPT->arg_type_begin(), 5493 FPT->getNumArgs(), EPI); 5494 return ResultType; 5495 } 5496 } 5497 return QualType(); 5498 } 5499 5500 // If the qualifiers are different, the types can still be merged. 5501 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5502 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5503 if (LQuals != RQuals) { 5504 // If any of these qualifiers are different, we have a type mismatch. 5505 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5506 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5507 return QualType(); 5508 5509 // Exactly one GC qualifier difference is allowed: __strong is 5510 // okay if the other type has no GC qualifier but is an Objective 5511 // C object pointer (i.e. implicitly strong by default). We fix 5512 // this by pretending that the unqualified type was actually 5513 // qualified __strong. 5514 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5515 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5516 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5517 5518 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5519 return QualType(); 5520 5521 if (GC_L == Qualifiers::Strong) 5522 return LHS; 5523 if (GC_R == Qualifiers::Strong) 5524 return RHS; 5525 return QualType(); 5526 } 5527 5528 if (LHSCan->isObjCObjectPointerType() && RHSCan->isObjCObjectPointerType()) { 5529 QualType LHSBaseQT = LHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5530 QualType RHSBaseQT = RHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5531 QualType ResQT = mergeObjCGCQualifiers(LHSBaseQT, RHSBaseQT); 5532 if (ResQT == LHSBaseQT) 5533 return LHS; 5534 if (ResQT == RHSBaseQT) 5535 return RHS; 5536 } 5537 return QualType(); 5538} 5539 5540//===----------------------------------------------------------------------===// 5541// Integer Predicates 5542//===----------------------------------------------------------------------===// 5543 5544unsigned ASTContext::getIntWidth(QualType T) const { 5545 if (const EnumType *ET = dyn_cast<EnumType>(T)) 5546 T = ET->getDecl()->getIntegerType(); 5547 if (T->isBooleanType()) 5548 return 1; 5549 // For builtin types, just use the standard type sizing method 5550 return (unsigned)getTypeSize(T); 5551} 5552 5553QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 5554 assert(T->hasSignedIntegerRepresentation() && "Unexpected type"); 5555 5556 // Turn <4 x signed int> -> <4 x unsigned int> 5557 if (const VectorType *VTy = T->getAs<VectorType>()) 5558 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 5559 VTy->getNumElements(), VTy->getVectorKind()); 5560 5561 // For enums, we return the unsigned version of the base type. 5562 if (const EnumType *ETy = T->getAs<EnumType>()) 5563 T = ETy->getDecl()->getIntegerType(); 5564 5565 const BuiltinType *BTy = T->getAs<BuiltinType>(); 5566 assert(BTy && "Unexpected signed integer type"); 5567 switch (BTy->getKind()) { 5568 case BuiltinType::Char_S: 5569 case BuiltinType::SChar: 5570 return UnsignedCharTy; 5571 case BuiltinType::Short: 5572 return UnsignedShortTy; 5573 case BuiltinType::Int: 5574 return UnsignedIntTy; 5575 case BuiltinType::Long: 5576 return UnsignedLongTy; 5577 case BuiltinType::LongLong: 5578 return UnsignedLongLongTy; 5579 case BuiltinType::Int128: 5580 return UnsignedInt128Ty; 5581 default: 5582 assert(0 && "Unexpected signed integer type"); 5583 return QualType(); 5584 } 5585} 5586 5587ExternalASTSource::~ExternalASTSource() { } 5588 5589void ExternalASTSource::PrintStats() { } 5590 5591ASTMutationListener::~ASTMutationListener() { } 5592 5593 5594//===----------------------------------------------------------------------===// 5595// Builtin Type Computation 5596//===----------------------------------------------------------------------===// 5597 5598/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 5599/// pointer over the consumed characters. This returns the resultant type. If 5600/// AllowTypeModifiers is false then modifier like * are not parsed, just basic 5601/// types. This allows "v2i*" to be parsed as a pointer to a v2i instead of 5602/// a vector of "i*". 5603/// 5604/// RequiresICE is filled in on return to indicate whether the value is required 5605/// to be an Integer Constant Expression. 5606static QualType DecodeTypeFromStr(const char *&Str, const ASTContext &Context, 5607 ASTContext::GetBuiltinTypeError &Error, 5608 bool &RequiresICE, 5609 bool AllowTypeModifiers) { 5610 // Modifiers. 5611 int HowLong = 0; 5612 bool Signed = false, Unsigned = false; 5613 RequiresICE = false; 5614 5615 // Read the prefixed modifiers first. 5616 bool Done = false; 5617 while (!Done) { 5618 switch (*Str++) { 5619 default: Done = true; --Str; break; 5620 case 'I': 5621 RequiresICE = true; 5622 break; 5623 case 'S': 5624 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 5625 assert(!Signed && "Can't use 'S' modifier multiple times!"); 5626 Signed = true; 5627 break; 5628 case 'U': 5629 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 5630 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 5631 Unsigned = true; 5632 break; 5633 case 'L': 5634 assert(HowLong <= 2 && "Can't have LLLL modifier"); 5635 ++HowLong; 5636 break; 5637 } 5638 } 5639 5640 QualType Type; 5641 5642 // Read the base type. 5643 switch (*Str++) { 5644 default: assert(0 && "Unknown builtin type letter!"); 5645 case 'v': 5646 assert(HowLong == 0 && !Signed && !Unsigned && 5647 "Bad modifiers used with 'v'!"); 5648 Type = Context.VoidTy; 5649 break; 5650 case 'f': 5651 assert(HowLong == 0 && !Signed && !Unsigned && 5652 "Bad modifiers used with 'f'!"); 5653 Type = Context.FloatTy; 5654 break; 5655 case 'd': 5656 assert(HowLong < 2 && !Signed && !Unsigned && 5657 "Bad modifiers used with 'd'!"); 5658 if (HowLong) 5659 Type = Context.LongDoubleTy; 5660 else 5661 Type = Context.DoubleTy; 5662 break; 5663 case 's': 5664 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 5665 if (Unsigned) 5666 Type = Context.UnsignedShortTy; 5667 else 5668 Type = Context.ShortTy; 5669 break; 5670 case 'i': 5671 if (HowLong == 3) 5672 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 5673 else if (HowLong == 2) 5674 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 5675 else if (HowLong == 1) 5676 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 5677 else 5678 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 5679 break; 5680 case 'c': 5681 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 5682 if (Signed) 5683 Type = Context.SignedCharTy; 5684 else if (Unsigned) 5685 Type = Context.UnsignedCharTy; 5686 else 5687 Type = Context.CharTy; 5688 break; 5689 case 'b': // boolean 5690 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 5691 Type = Context.BoolTy; 5692 break; 5693 case 'z': // size_t. 5694 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 5695 Type = Context.getSizeType(); 5696 break; 5697 case 'F': 5698 Type = Context.getCFConstantStringType(); 5699 break; 5700 case 'G': 5701 Type = Context.getObjCIdType(); 5702 break; 5703 case 'H': 5704 Type = Context.getObjCSelType(); 5705 break; 5706 case 'a': 5707 Type = Context.getBuiltinVaListType(); 5708 assert(!Type.isNull() && "builtin va list type not initialized!"); 5709 break; 5710 case 'A': 5711 // This is a "reference" to a va_list; however, what exactly 5712 // this means depends on how va_list is defined. There are two 5713 // different kinds of va_list: ones passed by value, and ones 5714 // passed by reference. An example of a by-value va_list is 5715 // x86, where va_list is a char*. An example of by-ref va_list 5716 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 5717 // we want this argument to be a char*&; for x86-64, we want 5718 // it to be a __va_list_tag*. 5719 Type = Context.getBuiltinVaListType(); 5720 assert(!Type.isNull() && "builtin va list type not initialized!"); 5721 if (Type->isArrayType()) 5722 Type = Context.getArrayDecayedType(Type); 5723 else 5724 Type = Context.getLValueReferenceType(Type); 5725 break; 5726 case 'V': { 5727 char *End; 5728 unsigned NumElements = strtoul(Str, &End, 10); 5729 assert(End != Str && "Missing vector size"); 5730 Str = End; 5731 5732 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, 5733 RequiresICE, false); 5734 assert(!RequiresICE && "Can't require vector ICE"); 5735 5736 // TODO: No way to make AltiVec vectors in builtins yet. 5737 Type = Context.getVectorType(ElementType, NumElements, 5738 VectorType::GenericVector); 5739 break; 5740 } 5741 case 'X': { 5742 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, RequiresICE, 5743 false); 5744 assert(!RequiresICE && "Can't require complex ICE"); 5745 Type = Context.getComplexType(ElementType); 5746 break; 5747 } 5748 case 'P': 5749 Type = Context.getFILEType(); 5750 if (Type.isNull()) { 5751 Error = ASTContext::GE_Missing_stdio; 5752 return QualType(); 5753 } 5754 break; 5755 case 'J': 5756 if (Signed) 5757 Type = Context.getsigjmp_bufType(); 5758 else 5759 Type = Context.getjmp_bufType(); 5760 5761 if (Type.isNull()) { 5762 Error = ASTContext::GE_Missing_setjmp; 5763 return QualType(); 5764 } 5765 break; 5766 } 5767 5768 // If there are modifiers and if we're allowed to parse them, go for it. 5769 Done = !AllowTypeModifiers; 5770 while (!Done) { 5771 switch (char c = *Str++) { 5772 default: Done = true; --Str; break; 5773 case '*': 5774 case '&': { 5775 // Both pointers and references can have their pointee types 5776 // qualified with an address space. 5777 char *End; 5778 unsigned AddrSpace = strtoul(Str, &End, 10); 5779 if (End != Str && AddrSpace != 0) { 5780 Type = Context.getAddrSpaceQualType(Type, AddrSpace); 5781 Str = End; 5782 } 5783 if (c == '*') 5784 Type = Context.getPointerType(Type); 5785 else 5786 Type = Context.getLValueReferenceType(Type); 5787 break; 5788 } 5789 // FIXME: There's no way to have a built-in with an rvalue ref arg. 5790 case 'C': 5791 Type = Type.withConst(); 5792 break; 5793 case 'D': 5794 Type = Context.getVolatileType(Type); 5795 break; 5796 } 5797 } 5798 5799 assert((!RequiresICE || Type->isIntegralOrEnumerationType()) && 5800 "Integer constant 'I' type must be an integer"); 5801 5802 return Type; 5803} 5804 5805/// GetBuiltinType - Return the type for the specified builtin. 5806QualType ASTContext::GetBuiltinType(unsigned Id, 5807 GetBuiltinTypeError &Error, 5808 unsigned *IntegerConstantArgs) const { 5809 const char *TypeStr = BuiltinInfo.GetTypeString(Id); 5810 5811 llvm::SmallVector<QualType, 8> ArgTypes; 5812 5813 bool RequiresICE = false; 5814 Error = GE_None; 5815 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error, 5816 RequiresICE, true); 5817 if (Error != GE_None) 5818 return QualType(); 5819 5820 assert(!RequiresICE && "Result of intrinsic cannot be required to be an ICE"); 5821 5822 while (TypeStr[0] && TypeStr[0] != '.') { 5823 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error, RequiresICE, true); 5824 if (Error != GE_None) 5825 return QualType(); 5826 5827 // If this argument is required to be an IntegerConstantExpression and the 5828 // caller cares, fill in the bitmask we return. 5829 if (RequiresICE && IntegerConstantArgs) 5830 *IntegerConstantArgs |= 1 << ArgTypes.size(); 5831 5832 // Do array -> pointer decay. The builtin should use the decayed type. 5833 if (Ty->isArrayType()) 5834 Ty = getArrayDecayedType(Ty); 5835 5836 ArgTypes.push_back(Ty); 5837 } 5838 5839 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 5840 "'.' should only occur at end of builtin type list!"); 5841 5842 FunctionType::ExtInfo EI; 5843 if (BuiltinInfo.isNoReturn(Id)) EI = EI.withNoReturn(true); 5844 5845 bool Variadic = (TypeStr[0] == '.'); 5846 5847 // We really shouldn't be making a no-proto type here, especially in C++. 5848 if (ArgTypes.empty() && Variadic) 5849 return getFunctionNoProtoType(ResType, EI); 5850 5851 FunctionProtoType::ExtProtoInfo EPI; 5852 EPI.ExtInfo = EI; 5853 EPI.Variadic = Variadic; 5854 5855 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), EPI); 5856} 5857 5858GVALinkage ASTContext::GetGVALinkageForFunction(const FunctionDecl *FD) { 5859 GVALinkage External = GVA_StrongExternal; 5860 5861 Linkage L = FD->getLinkage(); 5862 switch (L) { 5863 case NoLinkage: 5864 case InternalLinkage: 5865 case UniqueExternalLinkage: 5866 return GVA_Internal; 5867 5868 case ExternalLinkage: 5869 switch (FD->getTemplateSpecializationKind()) { 5870 case TSK_Undeclared: 5871 case TSK_ExplicitSpecialization: 5872 External = GVA_StrongExternal; 5873 break; 5874 5875 case TSK_ExplicitInstantiationDefinition: 5876 return GVA_ExplicitTemplateInstantiation; 5877 5878 case TSK_ExplicitInstantiationDeclaration: 5879 case TSK_ImplicitInstantiation: 5880 External = GVA_TemplateInstantiation; 5881 break; 5882 } 5883 } 5884 5885 if (!FD->isInlined()) 5886 return External; 5887 5888 if (!getLangOptions().CPlusPlus || FD->hasAttr<GNUInlineAttr>()) { 5889 // GNU or C99 inline semantics. Determine whether this symbol should be 5890 // externally visible. 5891 if (FD->isInlineDefinitionExternallyVisible()) 5892 return External; 5893 5894 // C99 inline semantics, where the symbol is not externally visible. 5895 return GVA_C99Inline; 5896 } 5897 5898 // C++0x [temp.explicit]p9: 5899 // [ Note: The intent is that an inline function that is the subject of 5900 // an explicit instantiation declaration will still be implicitly 5901 // instantiated when used so that the body can be considered for 5902 // inlining, but that no out-of-line copy of the inline function would be 5903 // generated in the translation unit. -- end note ] 5904 if (FD->getTemplateSpecializationKind() 5905 == TSK_ExplicitInstantiationDeclaration) 5906 return GVA_C99Inline; 5907 5908 return GVA_CXXInline; 5909} 5910 5911GVALinkage ASTContext::GetGVALinkageForVariable(const VarDecl *VD) { 5912 // If this is a static data member, compute the kind of template 5913 // specialization. Otherwise, this variable is not part of a 5914 // template. 5915 TemplateSpecializationKind TSK = TSK_Undeclared; 5916 if (VD->isStaticDataMember()) 5917 TSK = VD->getTemplateSpecializationKind(); 5918 5919 Linkage L = VD->getLinkage(); 5920 if (L == ExternalLinkage && getLangOptions().CPlusPlus && 5921 VD->getType()->getLinkage() == UniqueExternalLinkage) 5922 L = UniqueExternalLinkage; 5923 5924 switch (L) { 5925 case NoLinkage: 5926 case InternalLinkage: 5927 case UniqueExternalLinkage: 5928 return GVA_Internal; 5929 5930 case ExternalLinkage: 5931 switch (TSK) { 5932 case TSK_Undeclared: 5933 case TSK_ExplicitSpecialization: 5934 return GVA_StrongExternal; 5935 5936 case TSK_ExplicitInstantiationDeclaration: 5937 llvm_unreachable("Variable should not be instantiated"); 5938 // Fall through to treat this like any other instantiation. 5939 5940 case TSK_ExplicitInstantiationDefinition: 5941 return GVA_ExplicitTemplateInstantiation; 5942 5943 case TSK_ImplicitInstantiation: 5944 return GVA_TemplateInstantiation; 5945 } 5946 } 5947 5948 return GVA_StrongExternal; 5949} 5950 5951bool ASTContext::DeclMustBeEmitted(const Decl *D) { 5952 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 5953 if (!VD->isFileVarDecl()) 5954 return false; 5955 } else if (!isa<FunctionDecl>(D)) 5956 return false; 5957 5958 // Weak references don't produce any output by themselves. 5959 if (D->hasAttr<WeakRefAttr>()) 5960 return false; 5961 5962 // Aliases and used decls are required. 5963 if (D->hasAttr<AliasAttr>() || D->hasAttr<UsedAttr>()) 5964 return true; 5965 5966 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 5967 // Forward declarations aren't required. 5968 if (!FD->isThisDeclarationADefinition()) 5969 return false; 5970 5971 // Constructors and destructors are required. 5972 if (FD->hasAttr<ConstructorAttr>() || FD->hasAttr<DestructorAttr>()) 5973 return true; 5974 5975 // The key function for a class is required. 5976 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 5977 const CXXRecordDecl *RD = MD->getParent(); 5978 if (MD->isOutOfLine() && RD->isDynamicClass()) { 5979 const CXXMethodDecl *KeyFunc = getKeyFunction(RD); 5980 if (KeyFunc && KeyFunc->getCanonicalDecl() == MD->getCanonicalDecl()) 5981 return true; 5982 } 5983 } 5984 5985 GVALinkage Linkage = GetGVALinkageForFunction(FD); 5986 5987 // static, static inline, always_inline, and extern inline functions can 5988 // always be deferred. Normal inline functions can be deferred in C99/C++. 5989 // Implicit template instantiations can also be deferred in C++. 5990 if (Linkage == GVA_Internal || Linkage == GVA_C99Inline || 5991 Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) 5992 return false; 5993 return true; 5994 } 5995 5996 const VarDecl *VD = cast<VarDecl>(D); 5997 assert(VD->isFileVarDecl() && "Expected file scoped var"); 5998 5999 if (VD->isThisDeclarationADefinition() == VarDecl::DeclarationOnly) 6000 return false; 6001 6002 // Structs that have non-trivial constructors or destructors are required. 6003 6004 // FIXME: Handle references. 6005 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 6006 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 6007 if (RD->hasDefinition() && 6008 (!RD->hasTrivialConstructor() || !RD->hasTrivialDestructor())) 6009 return true; 6010 } 6011 } 6012 6013 GVALinkage L = GetGVALinkageForVariable(VD); 6014 if (L == GVA_Internal || L == GVA_TemplateInstantiation) { 6015 if (!(VD->getInit() && VD->getInit()->HasSideEffects(*this))) 6016 return false; 6017 } 6018 6019 return true; 6020} 6021 6022CallingConv ASTContext::getDefaultMethodCallConv() { 6023 // Pass through to the C++ ABI object 6024 return ABI->getDefaultMethodCallConv(); 6025} 6026 6027bool ASTContext::isNearlyEmpty(const CXXRecordDecl *RD) const { 6028 // Pass through to the C++ ABI object 6029 return ABI->isNearlyEmpty(RD); 6030} 6031 6032MangleContext *ASTContext::createMangleContext() { 6033 switch (Target.getCXXABI()) { 6034 case CXXABI_ARM: 6035 case CXXABI_Itanium: 6036 return createItaniumMangleContext(*this, getDiagnostics()); 6037 case CXXABI_Microsoft: 6038 return createMicrosoftMangleContext(*this, getDiagnostics()); 6039 } 6040 assert(0 && "Unsupported ABI"); 6041 return 0; 6042} 6043 6044CXXABI::~CXXABI() {} 6045