ASTContext.cpp revision 81148e9c24687564b3dd13bcb5e5e9f5100c0c95
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/RecordLayout.h" 24#include "clang/Basic/Builtins.h" 25#include "clang/Basic/SourceManager.h" 26#include "clang/Basic/TargetInfo.h" 27#include "llvm/ADT/SmallString.h" 28#include "llvm/ADT/StringExtras.h" 29#include "llvm/Support/MathExtras.h" 30#include "llvm/Support/raw_ostream.h" 31 32using namespace clang; 33 34enum FloatingRank { 35 FloatRank, DoubleRank, LongDoubleRank 36}; 37 38ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 39 const TargetInfo &t, 40 IdentifierTable &idents, SelectorTable &sels, 41 Builtin::Context &builtins, 42 bool FreeMem, unsigned size_reserve) : 43 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 44 NSConstantStringTypeDecl(0), 45 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 46 sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0), 47 SourceMgr(SM), LangOpts(LOpts), FreeMemory(FreeMem), Target(t), 48 Idents(idents), Selectors(sels), 49 BuiltinInfo(builtins), 50 DeclarationNames(*this), 51 ExternalSource(0), PrintingPolicy(LOpts), 52 LastSDM(0, 0) { 53 ObjCIdRedefinitionType = QualType(); 54 ObjCClassRedefinitionType = QualType(); 55 ObjCSelRedefinitionType = QualType(); 56 if (size_reserve > 0) Types.reserve(size_reserve); 57 TUDecl = TranslationUnitDecl::Create(*this); 58 InitBuiltinTypes(); 59} 60 61ASTContext::~ASTContext() { 62 // Release the DenseMaps associated with DeclContext objects. 63 // FIXME: Is this the ideal solution? 64 ReleaseDeclContextMaps(); 65 66 if (!FreeMemory) { 67 // Call all of the deallocation functions. 68 for (unsigned I = 0, N = Deallocations.size(); I != N; ++I) 69 Deallocations[I].first(Deallocations[I].second); 70 } 71 72 // Release all of the memory associated with overridden C++ methods. 73 for (llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::iterator 74 OM = OverriddenMethods.begin(), OMEnd = OverriddenMethods.end(); 75 OM != OMEnd; ++OM) 76 OM->second.Destroy(); 77 78 if (FreeMemory) { 79 // Deallocate all the types. 80 while (!Types.empty()) { 81 Types.back()->Destroy(*this); 82 Types.pop_back(); 83 } 84 85 for (llvm::FoldingSet<ExtQuals>::iterator 86 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); I != E; ) { 87 // Increment in loop to prevent using deallocated memory. 88 Deallocate(&*I++); 89 } 90 91 for (llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 92 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); I != E; ) { 93 // Increment in loop to prevent using deallocated memory. 94 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 95 R->Destroy(*this); 96 } 97 98 for (llvm::DenseMap<const ObjCContainerDecl*, 99 const ASTRecordLayout*>::iterator 100 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); I != E; ) { 101 // Increment in loop to prevent using deallocated memory. 102 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 103 R->Destroy(*this); 104 } 105 } 106 107 // Destroy nested-name-specifiers. 108 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 109 NNS = NestedNameSpecifiers.begin(), 110 NNSEnd = NestedNameSpecifiers.end(); 111 NNS != NNSEnd; ) { 112 // Increment in loop to prevent using deallocated memory. 113 (*NNS++).Destroy(*this); 114 } 115 116 if (GlobalNestedNameSpecifier) 117 GlobalNestedNameSpecifier->Destroy(*this); 118 119 TUDecl->Destroy(*this); 120} 121 122void ASTContext::AddDeallocation(void (*Callback)(void*), void *Data) { 123 Deallocations.push_back(std::make_pair(Callback, Data)); 124} 125 126void 127ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 128 ExternalSource.reset(Source.take()); 129} 130 131void ASTContext::PrintStats() const { 132 fprintf(stderr, "*** AST Context Stats:\n"); 133 fprintf(stderr, " %d types total.\n", (int)Types.size()); 134 135 unsigned counts[] = { 136#define TYPE(Name, Parent) 0, 137#define ABSTRACT_TYPE(Name, Parent) 138#include "clang/AST/TypeNodes.def" 139 0 // Extra 140 }; 141 142 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 143 Type *T = Types[i]; 144 counts[(unsigned)T->getTypeClass()]++; 145 } 146 147 unsigned Idx = 0; 148 unsigned TotalBytes = 0; 149#define TYPE(Name, Parent) \ 150 if (counts[Idx]) \ 151 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 152 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 153 ++Idx; 154#define ABSTRACT_TYPE(Name, Parent) 155#include "clang/AST/TypeNodes.def" 156 157 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 158 159 if (ExternalSource.get()) { 160 fprintf(stderr, "\n"); 161 ExternalSource->PrintStats(); 162 } 163} 164 165 166void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 167 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 168 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 169 Types.push_back(Ty); 170} 171 172void ASTContext::InitBuiltinTypes() { 173 assert(VoidTy.isNull() && "Context reinitialized?"); 174 175 // C99 6.2.5p19. 176 InitBuiltinType(VoidTy, BuiltinType::Void); 177 178 // C99 6.2.5p2. 179 InitBuiltinType(BoolTy, BuiltinType::Bool); 180 // C99 6.2.5p3. 181 if (LangOpts.CharIsSigned) 182 InitBuiltinType(CharTy, BuiltinType::Char_S); 183 else 184 InitBuiltinType(CharTy, BuiltinType::Char_U); 185 // C99 6.2.5p4. 186 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 187 InitBuiltinType(ShortTy, BuiltinType::Short); 188 InitBuiltinType(IntTy, BuiltinType::Int); 189 InitBuiltinType(LongTy, BuiltinType::Long); 190 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 191 192 // C99 6.2.5p6. 193 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 194 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 195 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 196 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 197 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 198 199 // C99 6.2.5p10. 200 InitBuiltinType(FloatTy, BuiltinType::Float); 201 InitBuiltinType(DoubleTy, BuiltinType::Double); 202 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 203 204 // GNU extension, 128-bit integers. 205 InitBuiltinType(Int128Ty, BuiltinType::Int128); 206 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 207 208 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 209 InitBuiltinType(WCharTy, BuiltinType::WChar); 210 else // C99 211 WCharTy = getFromTargetType(Target.getWCharType()); 212 213 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 214 InitBuiltinType(Char16Ty, BuiltinType::Char16); 215 else // C99 216 Char16Ty = getFromTargetType(Target.getChar16Type()); 217 218 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 219 InitBuiltinType(Char32Ty, BuiltinType::Char32); 220 else // C99 221 Char32Ty = getFromTargetType(Target.getChar32Type()); 222 223 // Placeholder type for functions. 224 InitBuiltinType(OverloadTy, BuiltinType::Overload); 225 226 // Placeholder type for type-dependent expressions whose type is 227 // completely unknown. No code should ever check a type against 228 // DependentTy and users should never see it; however, it is here to 229 // help diagnose failures to properly check for type-dependent 230 // expressions. 231 InitBuiltinType(DependentTy, BuiltinType::Dependent); 232 233 // Placeholder type for C++0x auto declarations whose real type has 234 // not yet been deduced. 235 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 236 237 // C99 6.2.5p11. 238 FloatComplexTy = getComplexType(FloatTy); 239 DoubleComplexTy = getComplexType(DoubleTy); 240 LongDoubleComplexTy = getComplexType(LongDoubleTy); 241 242 BuiltinVaListType = QualType(); 243 244 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 245 ObjCIdTypedefType = QualType(); 246 ObjCClassTypedefType = QualType(); 247 ObjCSelTypedefType = QualType(); 248 249 // Builtin types for 'id', 'Class', and 'SEL'. 250 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 251 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 252 InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel); 253 254 ObjCConstantStringType = QualType(); 255 256 // void * type 257 VoidPtrTy = getPointerType(VoidTy); 258 259 // nullptr type (C++0x 2.14.7) 260 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 261} 262 263MemberSpecializationInfo * 264ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 265 assert(Var->isStaticDataMember() && "Not a static data member"); 266 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 267 = InstantiatedFromStaticDataMember.find(Var); 268 if (Pos == InstantiatedFromStaticDataMember.end()) 269 return 0; 270 271 return Pos->second; 272} 273 274void 275ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 276 TemplateSpecializationKind TSK) { 277 assert(Inst->isStaticDataMember() && "Not a static data member"); 278 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 279 assert(!InstantiatedFromStaticDataMember[Inst] && 280 "Already noted what static data member was instantiated from"); 281 InstantiatedFromStaticDataMember[Inst] 282 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 283} 284 285NamedDecl * 286ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) { 287 llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos 288 = InstantiatedFromUsingDecl.find(UUD); 289 if (Pos == InstantiatedFromUsingDecl.end()) 290 return 0; 291 292 return Pos->second; 293} 294 295void 296ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) { 297 assert((isa<UsingDecl>(Pattern) || 298 isa<UnresolvedUsingValueDecl>(Pattern) || 299 isa<UnresolvedUsingTypenameDecl>(Pattern)) && 300 "pattern decl is not a using decl"); 301 assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists"); 302 InstantiatedFromUsingDecl[Inst] = Pattern; 303} 304 305UsingShadowDecl * 306ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) { 307 llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos 308 = InstantiatedFromUsingShadowDecl.find(Inst); 309 if (Pos == InstantiatedFromUsingShadowDecl.end()) 310 return 0; 311 312 return Pos->second; 313} 314 315void 316ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst, 317 UsingShadowDecl *Pattern) { 318 assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists"); 319 InstantiatedFromUsingShadowDecl[Inst] = Pattern; 320} 321 322FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 323 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 324 = InstantiatedFromUnnamedFieldDecl.find(Field); 325 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 326 return 0; 327 328 return Pos->second; 329} 330 331void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 332 FieldDecl *Tmpl) { 333 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 334 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 335 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 336 "Already noted what unnamed field was instantiated from"); 337 338 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 339} 340 341ASTContext::overridden_cxx_method_iterator 342ASTContext::overridden_methods_begin(const CXXMethodDecl *Method) const { 343 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 344 = OverriddenMethods.find(Method); 345 if (Pos == OverriddenMethods.end()) 346 return 0; 347 348 return Pos->second.begin(); 349} 350 351ASTContext::overridden_cxx_method_iterator 352ASTContext::overridden_methods_end(const CXXMethodDecl *Method) const { 353 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 354 = OverriddenMethods.find(Method); 355 if (Pos == OverriddenMethods.end()) 356 return 0; 357 358 return Pos->second.end(); 359} 360 361void ASTContext::addOverriddenMethod(const CXXMethodDecl *Method, 362 const CXXMethodDecl *Overridden) { 363 OverriddenMethods[Method].push_back(Overridden); 364} 365 366namespace { 367 class BeforeInTranslationUnit 368 : std::binary_function<SourceRange, SourceRange, bool> { 369 SourceManager *SourceMgr; 370 371 public: 372 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 373 374 bool operator()(SourceRange X, SourceRange Y) { 375 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 376 } 377 }; 378} 379 380//===----------------------------------------------------------------------===// 381// Type Sizing and Analysis 382//===----------------------------------------------------------------------===// 383 384/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 385/// scalar floating point type. 386const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 387 const BuiltinType *BT = T->getAs<BuiltinType>(); 388 assert(BT && "Not a floating point type!"); 389 switch (BT->getKind()) { 390 default: assert(0 && "Not a floating point type!"); 391 case BuiltinType::Float: return Target.getFloatFormat(); 392 case BuiltinType::Double: return Target.getDoubleFormat(); 393 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 394 } 395} 396 397/// getDeclAlign - Return a conservative estimate of the alignment of the 398/// specified decl. Note that bitfields do not have a valid alignment, so 399/// this method will assert on them. 400/// If @p RefAsPointee, references are treated like their underlying type 401/// (for alignof), else they're treated like pointers (for CodeGen). 402CharUnits ASTContext::getDeclAlign(const Decl *D, bool RefAsPointee) { 403 unsigned Align = Target.getCharWidth(); 404 405 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 406 Align = std::max(Align, AA->getMaxAlignment()); 407 408 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 409 QualType T = VD->getType(); 410 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 411 if (RefAsPointee) 412 T = RT->getPointeeType(); 413 else 414 T = getPointerType(RT->getPointeeType()); 415 } 416 if (!T->isIncompleteType() && !T->isFunctionType()) { 417 // Incomplete or function types default to 1. 418 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 419 T = cast<ArrayType>(T)->getElementType(); 420 421 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 422 } 423 if (const FieldDecl *FD = dyn_cast<FieldDecl>(VD)) { 424 // In the case of a field in a packed struct, we want the minimum 425 // of the alignment of the field and the alignment of the struct. 426 Align = std::min(Align, 427 getPreferredTypeAlign(FD->getParent()->getTypeForDecl())); 428 } 429 } 430 431 return CharUnits::fromQuantity(Align / Target.getCharWidth()); 432} 433 434std::pair<CharUnits, CharUnits> 435ASTContext::getTypeInfoInChars(const Type *T) { 436 std::pair<uint64_t, unsigned> Info = getTypeInfo(T); 437 return std::make_pair(CharUnits::fromQuantity(Info.first / getCharWidth()), 438 CharUnits::fromQuantity(Info.second / getCharWidth())); 439} 440 441std::pair<CharUnits, CharUnits> 442ASTContext::getTypeInfoInChars(QualType T) { 443 return getTypeInfoInChars(T.getTypePtr()); 444} 445 446/// getTypeSize - Return the size of the specified type, in bits. This method 447/// does not work on incomplete types. 448/// 449/// FIXME: Pointers into different addr spaces could have different sizes and 450/// alignment requirements: getPointerInfo should take an AddrSpace, this 451/// should take a QualType, &c. 452std::pair<uint64_t, unsigned> 453ASTContext::getTypeInfo(const Type *T) { 454 uint64_t Width=0; 455 unsigned Align=8; 456 switch (T->getTypeClass()) { 457#define TYPE(Class, Base) 458#define ABSTRACT_TYPE(Class, Base) 459#define NON_CANONICAL_TYPE(Class, Base) 460#define DEPENDENT_TYPE(Class, Base) case Type::Class: 461#include "clang/AST/TypeNodes.def" 462 assert(false && "Should not see dependent types"); 463 break; 464 465 case Type::FunctionNoProto: 466 case Type::FunctionProto: 467 // GCC extension: alignof(function) = 32 bits 468 Width = 0; 469 Align = 32; 470 break; 471 472 case Type::IncompleteArray: 473 case Type::VariableArray: 474 Width = 0; 475 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 476 break; 477 478 case Type::ConstantArray: { 479 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 480 481 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 482 Width = EltInfo.first*CAT->getSize().getZExtValue(); 483 Align = EltInfo.second; 484 break; 485 } 486 case Type::ExtVector: 487 case Type::Vector: { 488 const VectorType *VT = cast<VectorType>(T); 489 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 490 Width = EltInfo.first*VT->getNumElements(); 491 Align = Width; 492 // If the alignment is not a power of 2, round up to the next power of 2. 493 // This happens for non-power-of-2 length vectors. 494 if (Align & (Align-1)) { 495 Align = llvm::NextPowerOf2(Align); 496 Width = llvm::RoundUpToAlignment(Width, Align); 497 } 498 break; 499 } 500 501 case Type::Builtin: 502 switch (cast<BuiltinType>(T)->getKind()) { 503 default: assert(0 && "Unknown builtin type!"); 504 case BuiltinType::Void: 505 // GCC extension: alignof(void) = 8 bits. 506 Width = 0; 507 Align = 8; 508 break; 509 510 case BuiltinType::Bool: 511 Width = Target.getBoolWidth(); 512 Align = Target.getBoolAlign(); 513 break; 514 case BuiltinType::Char_S: 515 case BuiltinType::Char_U: 516 case BuiltinType::UChar: 517 case BuiltinType::SChar: 518 Width = Target.getCharWidth(); 519 Align = Target.getCharAlign(); 520 break; 521 case BuiltinType::WChar: 522 Width = Target.getWCharWidth(); 523 Align = Target.getWCharAlign(); 524 break; 525 case BuiltinType::Char16: 526 Width = Target.getChar16Width(); 527 Align = Target.getChar16Align(); 528 break; 529 case BuiltinType::Char32: 530 Width = Target.getChar32Width(); 531 Align = Target.getChar32Align(); 532 break; 533 case BuiltinType::UShort: 534 case BuiltinType::Short: 535 Width = Target.getShortWidth(); 536 Align = Target.getShortAlign(); 537 break; 538 case BuiltinType::UInt: 539 case BuiltinType::Int: 540 Width = Target.getIntWidth(); 541 Align = Target.getIntAlign(); 542 break; 543 case BuiltinType::ULong: 544 case BuiltinType::Long: 545 Width = Target.getLongWidth(); 546 Align = Target.getLongAlign(); 547 break; 548 case BuiltinType::ULongLong: 549 case BuiltinType::LongLong: 550 Width = Target.getLongLongWidth(); 551 Align = Target.getLongLongAlign(); 552 break; 553 case BuiltinType::Int128: 554 case BuiltinType::UInt128: 555 Width = 128; 556 Align = 128; // int128_t is 128-bit aligned on all targets. 557 break; 558 case BuiltinType::Float: 559 Width = Target.getFloatWidth(); 560 Align = Target.getFloatAlign(); 561 break; 562 case BuiltinType::Double: 563 Width = Target.getDoubleWidth(); 564 Align = Target.getDoubleAlign(); 565 break; 566 case BuiltinType::LongDouble: 567 Width = Target.getLongDoubleWidth(); 568 Align = Target.getLongDoubleAlign(); 569 break; 570 case BuiltinType::NullPtr: 571 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 572 Align = Target.getPointerAlign(0); // == sizeof(void*) 573 break; 574 } 575 break; 576 case Type::ObjCObjectPointer: 577 Width = Target.getPointerWidth(0); 578 Align = Target.getPointerAlign(0); 579 break; 580 case Type::BlockPointer: { 581 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 582 Width = Target.getPointerWidth(AS); 583 Align = Target.getPointerAlign(AS); 584 break; 585 } 586 case Type::LValueReference: 587 case Type::RValueReference: { 588 // alignof and sizeof should never enter this code path here, so we go 589 // the pointer route. 590 unsigned AS = cast<ReferenceType>(T)->getPointeeType().getAddressSpace(); 591 Width = Target.getPointerWidth(AS); 592 Align = Target.getPointerAlign(AS); 593 break; 594 } 595 case Type::Pointer: { 596 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 597 Width = Target.getPointerWidth(AS); 598 Align = Target.getPointerAlign(AS); 599 break; 600 } 601 case Type::MemberPointer: { 602 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 603 std::pair<uint64_t, unsigned> PtrDiffInfo = 604 getTypeInfo(getPointerDiffType()); 605 Width = PtrDiffInfo.first; 606 if (Pointee->isFunctionType()) 607 Width *= 2; 608 Align = PtrDiffInfo.second; 609 break; 610 } 611 case Type::Complex: { 612 // Complex types have the same alignment as their elements, but twice the 613 // size. 614 std::pair<uint64_t, unsigned> EltInfo = 615 getTypeInfo(cast<ComplexType>(T)->getElementType()); 616 Width = EltInfo.first*2; 617 Align = EltInfo.second; 618 break; 619 } 620 case Type::ObjCObject: 621 return getTypeInfo(cast<ObjCObjectType>(T)->getBaseType().getTypePtr()); 622 case Type::ObjCInterface: { 623 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 624 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 625 Width = Layout.getSize(); 626 Align = Layout.getAlignment(); 627 break; 628 } 629 case Type::Record: 630 case Type::Enum: { 631 const TagType *TT = cast<TagType>(T); 632 633 if (TT->getDecl()->isInvalidDecl()) { 634 Width = 1; 635 Align = 1; 636 break; 637 } 638 639 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 640 return getTypeInfo(ET->getDecl()->getIntegerType()); 641 642 const RecordType *RT = cast<RecordType>(TT); 643 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 644 Width = Layout.getSize(); 645 Align = Layout.getAlignment(); 646 break; 647 } 648 649 case Type::SubstTemplateTypeParm: 650 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 651 getReplacementType().getTypePtr()); 652 653 case Type::Typedef: { 654 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 655 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 656 Align = std::max(Aligned->getMaxAlignment(), 657 getTypeAlign(Typedef->getUnderlyingType().getTypePtr())); 658 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 659 } else 660 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 661 break; 662 } 663 664 case Type::TypeOfExpr: 665 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 666 .getTypePtr()); 667 668 case Type::TypeOf: 669 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 670 671 case Type::Decltype: 672 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 673 .getTypePtr()); 674 675 case Type::Elaborated: 676 return getTypeInfo(cast<ElaboratedType>(T)->getNamedType().getTypePtr()); 677 678 case Type::TemplateSpecialization: 679 assert(getCanonicalType(T) != T && 680 "Cannot request the size of a dependent type"); 681 // FIXME: this is likely to be wrong once we support template 682 // aliases, since a template alias could refer to a typedef that 683 // has an __aligned__ attribute on it. 684 return getTypeInfo(getCanonicalType(T)); 685 } 686 687 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 688 return std::make_pair(Width, Align); 689} 690 691/// getTypeSizeInChars - Return the size of the specified type, in characters. 692/// This method does not work on incomplete types. 693CharUnits ASTContext::getTypeSizeInChars(QualType T) { 694 return CharUnits::fromQuantity(getTypeSize(T) / getCharWidth()); 695} 696CharUnits ASTContext::getTypeSizeInChars(const Type *T) { 697 return CharUnits::fromQuantity(getTypeSize(T) / getCharWidth()); 698} 699 700/// getTypeAlignInChars - Return the ABI-specified alignment of a type, in 701/// characters. This method does not work on incomplete types. 702CharUnits ASTContext::getTypeAlignInChars(QualType T) { 703 return CharUnits::fromQuantity(getTypeAlign(T) / getCharWidth()); 704} 705CharUnits ASTContext::getTypeAlignInChars(const Type *T) { 706 return CharUnits::fromQuantity(getTypeAlign(T) / getCharWidth()); 707} 708 709/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 710/// type for the current target in bits. This can be different than the ABI 711/// alignment in cases where it is beneficial for performance to overalign 712/// a data type. 713unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 714 unsigned ABIAlign = getTypeAlign(T); 715 716 // Double and long long should be naturally aligned if possible. 717 if (const ComplexType* CT = T->getAs<ComplexType>()) 718 T = CT->getElementType().getTypePtr(); 719 if (T->isSpecificBuiltinType(BuiltinType::Double) || 720 T->isSpecificBuiltinType(BuiltinType::LongLong)) 721 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 722 723 return ABIAlign; 724} 725 726static void CollectLocalObjCIvars(ASTContext *Ctx, 727 const ObjCInterfaceDecl *OI, 728 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 729 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 730 E = OI->ivar_end(); I != E; ++I) { 731 ObjCIvarDecl *IVDecl = *I; 732 if (!IVDecl->isInvalidDecl()) 733 Fields.push_back(cast<FieldDecl>(IVDecl)); 734 } 735} 736 737void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 738 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 739 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 740 CollectObjCIvars(SuperClass, Fields); 741 CollectLocalObjCIvars(this, OI, Fields); 742} 743 744/// ShallowCollectObjCIvars - 745/// Collect all ivars, including those synthesized, in the current class. 746/// 747void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 748 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 749 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 750 E = OI->ivar_end(); I != E; ++I) { 751 Ivars.push_back(*I); 752 } 753 754 CollectNonClassIvars(OI, Ivars); 755} 756 757/// CollectNonClassIvars - 758/// This routine collects all other ivars which are not declared in the class. 759/// This includes synthesized ivars (via @synthesize) and those in 760// class's @implementation. 761/// 762void ASTContext::CollectNonClassIvars(const ObjCInterfaceDecl *OI, 763 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 764 // Find ivars declared in class extension. 765 if (const ObjCCategoryDecl *CDecl = OI->getClassExtension()) { 766 for (ObjCCategoryDecl::ivar_iterator I = CDecl->ivar_begin(), 767 E = CDecl->ivar_end(); I != E; ++I) { 768 Ivars.push_back(*I); 769 } 770 } 771 772 // Also add any ivar defined in this class's implementation. This 773 // includes synthesized ivars. 774 if (ObjCImplementationDecl *ImplDecl = OI->getImplementation()) { 775 for (ObjCImplementationDecl::ivar_iterator I = ImplDecl->ivar_begin(), 776 E = ImplDecl->ivar_end(); I != E; ++I) 777 Ivars.push_back(*I); 778 } 779} 780 781/// CollectInheritedProtocols - Collect all protocols in current class and 782/// those inherited by it. 783void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 784 llvm::SmallPtrSet<ObjCProtocolDecl*, 8> &Protocols) { 785 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 786 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 787 PE = OI->protocol_end(); P != PE; ++P) { 788 ObjCProtocolDecl *Proto = (*P); 789 Protocols.insert(Proto); 790 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 791 PE = Proto->protocol_end(); P != PE; ++P) { 792 Protocols.insert(*P); 793 CollectInheritedProtocols(*P, Protocols); 794 } 795 } 796 797 // Categories of this Interface. 798 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 799 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 800 CollectInheritedProtocols(CDeclChain, Protocols); 801 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 802 while (SD) { 803 CollectInheritedProtocols(SD, Protocols); 804 SD = SD->getSuperClass(); 805 } 806 } else if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 807 for (ObjCInterfaceDecl::protocol_iterator P = OC->protocol_begin(), 808 PE = OC->protocol_end(); P != PE; ++P) { 809 ObjCProtocolDecl *Proto = (*P); 810 Protocols.insert(Proto); 811 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 812 PE = Proto->protocol_end(); P != PE; ++P) 813 CollectInheritedProtocols(*P, Protocols); 814 } 815 } else if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 816 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 817 PE = OP->protocol_end(); P != PE; ++P) { 818 ObjCProtocolDecl *Proto = (*P); 819 Protocols.insert(Proto); 820 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 821 PE = Proto->protocol_end(); P != PE; ++P) 822 CollectInheritedProtocols(*P, Protocols); 823 } 824 } 825} 826 827unsigned ASTContext::CountNonClassIvars(const ObjCInterfaceDecl *OI) { 828 unsigned count = 0; 829 // Count ivars declared in class extension. 830 if (const ObjCCategoryDecl *CDecl = OI->getClassExtension()) 831 count += CDecl->ivar_size(); 832 833 // Count ivar defined in this class's implementation. This 834 // includes synthesized ivars. 835 if (ObjCImplementationDecl *ImplDecl = OI->getImplementation()) 836 count += ImplDecl->ivar_size(); 837 838 return count; 839} 840 841/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 842ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 843 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 844 I = ObjCImpls.find(D); 845 if (I != ObjCImpls.end()) 846 return cast<ObjCImplementationDecl>(I->second); 847 return 0; 848} 849/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 850ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 851 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 852 I = ObjCImpls.find(D); 853 if (I != ObjCImpls.end()) 854 return cast<ObjCCategoryImplDecl>(I->second); 855 return 0; 856} 857 858/// \brief Set the implementation of ObjCInterfaceDecl. 859void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 860 ObjCImplementationDecl *ImplD) { 861 assert(IFaceD && ImplD && "Passed null params"); 862 ObjCImpls[IFaceD] = ImplD; 863} 864/// \brief Set the implementation of ObjCCategoryDecl. 865void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 866 ObjCCategoryImplDecl *ImplD) { 867 assert(CatD && ImplD && "Passed null params"); 868 ObjCImpls[CatD] = ImplD; 869} 870 871/// \brief Allocate an uninitialized TypeSourceInfo. 872/// 873/// The caller should initialize the memory held by TypeSourceInfo using 874/// the TypeLoc wrappers. 875/// 876/// \param T the type that will be the basis for type source info. This type 877/// should refer to how the declarator was written in source code, not to 878/// what type semantic analysis resolved the declarator to. 879TypeSourceInfo *ASTContext::CreateTypeSourceInfo(QualType T, 880 unsigned DataSize) { 881 if (!DataSize) 882 DataSize = TypeLoc::getFullDataSizeForType(T); 883 else 884 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 885 "incorrect data size provided to CreateTypeSourceInfo!"); 886 887 TypeSourceInfo *TInfo = 888 (TypeSourceInfo*)BumpAlloc.Allocate(sizeof(TypeSourceInfo) + DataSize, 8); 889 new (TInfo) TypeSourceInfo(T); 890 return TInfo; 891} 892 893TypeSourceInfo *ASTContext::getTrivialTypeSourceInfo(QualType T, 894 SourceLocation L) { 895 TypeSourceInfo *DI = CreateTypeSourceInfo(T); 896 DI->getTypeLoc().initialize(L); 897 return DI; 898} 899 900const ASTRecordLayout & 901ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 902 return getObjCLayout(D, 0); 903} 904 905const ASTRecordLayout & 906ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 907 return getObjCLayout(D->getClassInterface(), D); 908} 909 910//===----------------------------------------------------------------------===// 911// Type creation/memoization methods 912//===----------------------------------------------------------------------===// 913 914QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 915 unsigned Fast = Quals.getFastQualifiers(); 916 Quals.removeFastQualifiers(); 917 918 // Check if we've already instantiated this type. 919 llvm::FoldingSetNodeID ID; 920 ExtQuals::Profile(ID, TypeNode, Quals); 921 void *InsertPos = 0; 922 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 923 assert(EQ->getQualifiers() == Quals); 924 QualType T = QualType(EQ, Fast); 925 return T; 926 } 927 928 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 929 ExtQualNodes.InsertNode(New, InsertPos); 930 QualType T = QualType(New, Fast); 931 return T; 932} 933 934QualType ASTContext::getVolatileType(QualType T) { 935 QualType CanT = getCanonicalType(T); 936 if (CanT.isVolatileQualified()) return T; 937 938 QualifierCollector Quals; 939 const Type *TypeNode = Quals.strip(T); 940 Quals.addVolatile(); 941 942 return getExtQualType(TypeNode, Quals); 943} 944 945QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 946 QualType CanT = getCanonicalType(T); 947 if (CanT.getAddressSpace() == AddressSpace) 948 return T; 949 950 // If we are composing extended qualifiers together, merge together 951 // into one ExtQuals node. 952 QualifierCollector Quals; 953 const Type *TypeNode = Quals.strip(T); 954 955 // If this type already has an address space specified, it cannot get 956 // another one. 957 assert(!Quals.hasAddressSpace() && 958 "Type cannot be in multiple addr spaces!"); 959 Quals.addAddressSpace(AddressSpace); 960 961 return getExtQualType(TypeNode, Quals); 962} 963 964QualType ASTContext::getObjCGCQualType(QualType T, 965 Qualifiers::GC GCAttr) { 966 QualType CanT = getCanonicalType(T); 967 if (CanT.getObjCGCAttr() == GCAttr) 968 return T; 969 970 if (T->isPointerType()) { 971 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 972 if (Pointee->isAnyPointerType()) { 973 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 974 return getPointerType(ResultType); 975 } 976 } 977 978 // If we are composing extended qualifiers together, merge together 979 // into one ExtQuals node. 980 QualifierCollector Quals; 981 const Type *TypeNode = Quals.strip(T); 982 983 // If this type already has an ObjCGC specified, it cannot get 984 // another one. 985 assert(!Quals.hasObjCGCAttr() && 986 "Type cannot have multiple ObjCGCs!"); 987 Quals.addObjCGCAttr(GCAttr); 988 989 return getExtQualType(TypeNode, Quals); 990} 991 992static QualType getExtFunctionType(ASTContext& Context, QualType T, 993 const FunctionType::ExtInfo &Info) { 994 QualType ResultType; 995 if (const PointerType *Pointer = T->getAs<PointerType>()) { 996 QualType Pointee = Pointer->getPointeeType(); 997 ResultType = getExtFunctionType(Context, Pointee, Info); 998 if (ResultType == Pointee) 999 return T; 1000 1001 ResultType = Context.getPointerType(ResultType); 1002 } else if (const BlockPointerType *BlockPointer 1003 = T->getAs<BlockPointerType>()) { 1004 QualType Pointee = BlockPointer->getPointeeType(); 1005 ResultType = getExtFunctionType(Context, Pointee, Info); 1006 if (ResultType == Pointee) 1007 return T; 1008 1009 ResultType = Context.getBlockPointerType(ResultType); 1010 } else if (const FunctionType *F = T->getAs<FunctionType>()) { 1011 if (F->getExtInfo() == Info) 1012 return T; 1013 1014 if (const FunctionNoProtoType *FNPT = dyn_cast<FunctionNoProtoType>(F)) { 1015 ResultType = Context.getFunctionNoProtoType(FNPT->getResultType(), 1016 Info); 1017 } else { 1018 const FunctionProtoType *FPT = cast<FunctionProtoType>(F); 1019 ResultType 1020 = Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 1021 FPT->getNumArgs(), FPT->isVariadic(), 1022 FPT->getTypeQuals(), 1023 FPT->hasExceptionSpec(), 1024 FPT->hasAnyExceptionSpec(), 1025 FPT->getNumExceptions(), 1026 FPT->exception_begin(), 1027 Info); 1028 } 1029 } else 1030 return T; 1031 1032 return Context.getQualifiedType(ResultType, T.getLocalQualifiers()); 1033} 1034 1035QualType ASTContext::getNoReturnType(QualType T, bool AddNoReturn) { 1036 FunctionType::ExtInfo Info = getFunctionExtInfo(T); 1037 return getExtFunctionType(*this, T, 1038 Info.withNoReturn(AddNoReturn)); 1039} 1040 1041QualType ASTContext::getCallConvType(QualType T, CallingConv CallConv) { 1042 FunctionType::ExtInfo Info = getFunctionExtInfo(T); 1043 return getExtFunctionType(*this, T, 1044 Info.withCallingConv(CallConv)); 1045} 1046 1047QualType ASTContext::getRegParmType(QualType T, unsigned RegParm) { 1048 FunctionType::ExtInfo Info = getFunctionExtInfo(T); 1049 return getExtFunctionType(*this, T, 1050 Info.withRegParm(RegParm)); 1051} 1052 1053/// getComplexType - Return the uniqued reference to the type for a complex 1054/// number with the specified element type. 1055QualType ASTContext::getComplexType(QualType T) { 1056 // Unique pointers, to guarantee there is only one pointer of a particular 1057 // structure. 1058 llvm::FoldingSetNodeID ID; 1059 ComplexType::Profile(ID, T); 1060 1061 void *InsertPos = 0; 1062 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1063 return QualType(CT, 0); 1064 1065 // If the pointee type isn't canonical, this won't be a canonical type either, 1066 // so fill in the canonical type field. 1067 QualType Canonical; 1068 if (!T.isCanonical()) { 1069 Canonical = getComplexType(getCanonicalType(T)); 1070 1071 // Get the new insert position for the node we care about. 1072 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1073 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1074 } 1075 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1076 Types.push_back(New); 1077 ComplexTypes.InsertNode(New, InsertPos); 1078 return QualType(New, 0); 1079} 1080 1081/// getPointerType - Return the uniqued reference to the type for a pointer to 1082/// the specified type. 1083QualType ASTContext::getPointerType(QualType T) { 1084 // Unique pointers, to guarantee there is only one pointer of a particular 1085 // structure. 1086 llvm::FoldingSetNodeID ID; 1087 PointerType::Profile(ID, T); 1088 1089 void *InsertPos = 0; 1090 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1091 return QualType(PT, 0); 1092 1093 // If the pointee type isn't canonical, this won't be a canonical type either, 1094 // so fill in the canonical type field. 1095 QualType Canonical; 1096 if (!T.isCanonical()) { 1097 Canonical = getPointerType(getCanonicalType(T)); 1098 1099 // Get the new insert position for the node we care about. 1100 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1101 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1102 } 1103 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1104 Types.push_back(New); 1105 PointerTypes.InsertNode(New, InsertPos); 1106 return QualType(New, 0); 1107} 1108 1109/// getBlockPointerType - Return the uniqued reference to the type for 1110/// a pointer to the specified block. 1111QualType ASTContext::getBlockPointerType(QualType T) { 1112 assert(T->isFunctionType() && "block of function types only"); 1113 // Unique pointers, to guarantee there is only one block of a particular 1114 // structure. 1115 llvm::FoldingSetNodeID ID; 1116 BlockPointerType::Profile(ID, T); 1117 1118 void *InsertPos = 0; 1119 if (BlockPointerType *PT = 1120 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1121 return QualType(PT, 0); 1122 1123 // If the block pointee type isn't canonical, this won't be a canonical 1124 // type either so fill in the canonical type field. 1125 QualType Canonical; 1126 if (!T.isCanonical()) { 1127 Canonical = getBlockPointerType(getCanonicalType(T)); 1128 1129 // Get the new insert position for the node we care about. 1130 BlockPointerType *NewIP = 1131 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1132 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1133 } 1134 BlockPointerType *New 1135 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1136 Types.push_back(New); 1137 BlockPointerTypes.InsertNode(New, InsertPos); 1138 return QualType(New, 0); 1139} 1140 1141/// getLValueReferenceType - Return the uniqued reference to the type for an 1142/// lvalue reference to the specified type. 1143QualType ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) { 1144 // Unique pointers, to guarantee there is only one pointer of a particular 1145 // structure. 1146 llvm::FoldingSetNodeID ID; 1147 ReferenceType::Profile(ID, T, SpelledAsLValue); 1148 1149 void *InsertPos = 0; 1150 if (LValueReferenceType *RT = 1151 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1152 return QualType(RT, 0); 1153 1154 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1155 1156 // If the referencee type isn't canonical, this won't be a canonical type 1157 // either, so fill in the canonical type field. 1158 QualType Canonical; 1159 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1160 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1161 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1162 1163 // Get the new insert position for the node we care about. 1164 LValueReferenceType *NewIP = 1165 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1166 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1167 } 1168 1169 LValueReferenceType *New 1170 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1171 SpelledAsLValue); 1172 Types.push_back(New); 1173 LValueReferenceTypes.InsertNode(New, InsertPos); 1174 1175 return QualType(New, 0); 1176} 1177 1178/// getRValueReferenceType - Return the uniqued reference to the type for an 1179/// rvalue reference to the specified type. 1180QualType ASTContext::getRValueReferenceType(QualType T) { 1181 // Unique pointers, to guarantee there is only one pointer of a particular 1182 // structure. 1183 llvm::FoldingSetNodeID ID; 1184 ReferenceType::Profile(ID, T, false); 1185 1186 void *InsertPos = 0; 1187 if (RValueReferenceType *RT = 1188 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1189 return QualType(RT, 0); 1190 1191 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1192 1193 // If the referencee type isn't canonical, this won't be a canonical type 1194 // either, so fill in the canonical type field. 1195 QualType Canonical; 1196 if (InnerRef || !T.isCanonical()) { 1197 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1198 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1199 1200 // Get the new insert position for the node we care about. 1201 RValueReferenceType *NewIP = 1202 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1203 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1204 } 1205 1206 RValueReferenceType *New 1207 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1208 Types.push_back(New); 1209 RValueReferenceTypes.InsertNode(New, InsertPos); 1210 return QualType(New, 0); 1211} 1212 1213/// getMemberPointerType - Return the uniqued reference to the type for a 1214/// member pointer to the specified type, in the specified class. 1215QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1216 // Unique pointers, to guarantee there is only one pointer of a particular 1217 // structure. 1218 llvm::FoldingSetNodeID ID; 1219 MemberPointerType::Profile(ID, T, Cls); 1220 1221 void *InsertPos = 0; 1222 if (MemberPointerType *PT = 1223 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1224 return QualType(PT, 0); 1225 1226 // If the pointee or class type isn't canonical, this won't be a canonical 1227 // type either, so fill in the canonical type field. 1228 QualType Canonical; 1229 if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) { 1230 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1231 1232 // Get the new insert position for the node we care about. 1233 MemberPointerType *NewIP = 1234 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1235 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1236 } 1237 MemberPointerType *New 1238 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1239 Types.push_back(New); 1240 MemberPointerTypes.InsertNode(New, InsertPos); 1241 return QualType(New, 0); 1242} 1243 1244/// getConstantArrayType - Return the unique reference to the type for an 1245/// array of the specified element type. 1246QualType ASTContext::getConstantArrayType(QualType EltTy, 1247 const llvm::APInt &ArySizeIn, 1248 ArrayType::ArraySizeModifier ASM, 1249 unsigned EltTypeQuals) { 1250 assert((EltTy->isDependentType() || 1251 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1252 "Constant array of VLAs is illegal!"); 1253 1254 // Convert the array size into a canonical width matching the pointer size for 1255 // the target. 1256 llvm::APInt ArySize(ArySizeIn); 1257 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1258 1259 llvm::FoldingSetNodeID ID; 1260 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1261 1262 void *InsertPos = 0; 1263 if (ConstantArrayType *ATP = 1264 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1265 return QualType(ATP, 0); 1266 1267 // If the element type isn't canonical, this won't be a canonical type either, 1268 // so fill in the canonical type field. 1269 QualType Canonical; 1270 if (!EltTy.isCanonical()) { 1271 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1272 ASM, EltTypeQuals); 1273 // Get the new insert position for the node we care about. 1274 ConstantArrayType *NewIP = 1275 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1276 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1277 } 1278 1279 ConstantArrayType *New = new(*this,TypeAlignment) 1280 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1281 ConstantArrayTypes.InsertNode(New, InsertPos); 1282 Types.push_back(New); 1283 return QualType(New, 0); 1284} 1285 1286/// getVariableArrayType - Returns a non-unique reference to the type for a 1287/// variable array of the specified element type. 1288QualType ASTContext::getVariableArrayType(QualType EltTy, 1289 Expr *NumElts, 1290 ArrayType::ArraySizeModifier ASM, 1291 unsigned EltTypeQuals, 1292 SourceRange Brackets) { 1293 // Since we don't unique expressions, it isn't possible to unique VLA's 1294 // that have an expression provided for their size. 1295 QualType CanonType; 1296 1297 if (!EltTy.isCanonical()) { 1298 if (NumElts) 1299 NumElts->Retain(); 1300 CanonType = getVariableArrayType(getCanonicalType(EltTy), NumElts, ASM, 1301 EltTypeQuals, Brackets); 1302 } 1303 1304 VariableArrayType *New = new(*this, TypeAlignment) 1305 VariableArrayType(EltTy, CanonType, NumElts, ASM, EltTypeQuals, Brackets); 1306 1307 VariableArrayTypes.push_back(New); 1308 Types.push_back(New); 1309 return QualType(New, 0); 1310} 1311 1312/// getDependentSizedArrayType - Returns a non-unique reference to 1313/// the type for a dependently-sized array of the specified element 1314/// type. 1315QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1316 Expr *NumElts, 1317 ArrayType::ArraySizeModifier ASM, 1318 unsigned EltTypeQuals, 1319 SourceRange Brackets) { 1320 assert((!NumElts || NumElts->isTypeDependent() || 1321 NumElts->isValueDependent()) && 1322 "Size must be type- or value-dependent!"); 1323 1324 void *InsertPos = 0; 1325 DependentSizedArrayType *Canon = 0; 1326 llvm::FoldingSetNodeID ID; 1327 1328 if (NumElts) { 1329 // Dependently-sized array types that do not have a specified 1330 // number of elements will have their sizes deduced from an 1331 // initializer. 1332 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1333 EltTypeQuals, NumElts); 1334 1335 Canon = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1336 } 1337 1338 DependentSizedArrayType *New; 1339 if (Canon) { 1340 // We already have a canonical version of this array type; use it as 1341 // the canonical type for a newly-built type. 1342 New = new (*this, TypeAlignment) 1343 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1344 NumElts, ASM, EltTypeQuals, Brackets); 1345 } else { 1346 QualType CanonEltTy = getCanonicalType(EltTy); 1347 if (CanonEltTy == EltTy) { 1348 New = new (*this, TypeAlignment) 1349 DependentSizedArrayType(*this, EltTy, QualType(), 1350 NumElts, ASM, EltTypeQuals, Brackets); 1351 1352 if (NumElts) { 1353 DependentSizedArrayType *CanonCheck 1354 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1355 assert(!CanonCheck && "Dependent-sized canonical array type broken"); 1356 (void)CanonCheck; 1357 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1358 } 1359 } else { 1360 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1361 ASM, EltTypeQuals, 1362 SourceRange()); 1363 New = new (*this, TypeAlignment) 1364 DependentSizedArrayType(*this, EltTy, Canon, 1365 NumElts, ASM, EltTypeQuals, Brackets); 1366 } 1367 } 1368 1369 Types.push_back(New); 1370 return QualType(New, 0); 1371} 1372 1373QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1374 ArrayType::ArraySizeModifier ASM, 1375 unsigned EltTypeQuals) { 1376 llvm::FoldingSetNodeID ID; 1377 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1378 1379 void *InsertPos = 0; 1380 if (IncompleteArrayType *ATP = 1381 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1382 return QualType(ATP, 0); 1383 1384 // If the element type isn't canonical, this won't be a canonical type 1385 // either, so fill in the canonical type field. 1386 QualType Canonical; 1387 1388 if (!EltTy.isCanonical()) { 1389 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1390 ASM, EltTypeQuals); 1391 1392 // Get the new insert position for the node we care about. 1393 IncompleteArrayType *NewIP = 1394 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1395 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1396 } 1397 1398 IncompleteArrayType *New = new (*this, TypeAlignment) 1399 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1400 1401 IncompleteArrayTypes.InsertNode(New, InsertPos); 1402 Types.push_back(New); 1403 return QualType(New, 0); 1404} 1405 1406/// getVectorType - Return the unique reference to a vector type of 1407/// the specified element type and size. VectorType must be a built-in type. 1408QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts, 1409 bool IsAltiVec, bool IsPixel) { 1410 BuiltinType *baseType; 1411 1412 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1413 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1414 1415 // Check if we've already instantiated a vector of this type. 1416 llvm::FoldingSetNodeID ID; 1417 VectorType::Profile(ID, vecType, NumElts, Type::Vector, 1418 IsAltiVec, IsPixel); 1419 void *InsertPos = 0; 1420 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1421 return QualType(VTP, 0); 1422 1423 // If the element type isn't canonical, this won't be a canonical type either, 1424 // so fill in the canonical type field. 1425 QualType Canonical; 1426 if (!vecType.isCanonical() || IsAltiVec || IsPixel) { 1427 Canonical = getVectorType(getCanonicalType(vecType), 1428 NumElts, false, false); 1429 1430 // Get the new insert position for the node we care about. 1431 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1432 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1433 } 1434 VectorType *New = new (*this, TypeAlignment) 1435 VectorType(vecType, NumElts, Canonical, IsAltiVec, IsPixel); 1436 VectorTypes.InsertNode(New, InsertPos); 1437 Types.push_back(New); 1438 return QualType(New, 0); 1439} 1440 1441/// getExtVectorType - Return the unique reference to an extended vector type of 1442/// the specified element type and size. VectorType must be a built-in type. 1443QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1444 BuiltinType *baseType; 1445 1446 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1447 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1448 1449 // Check if we've already instantiated a vector of this type. 1450 llvm::FoldingSetNodeID ID; 1451 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector, false, false); 1452 void *InsertPos = 0; 1453 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1454 return QualType(VTP, 0); 1455 1456 // If the element type isn't canonical, this won't be a canonical type either, 1457 // so fill in the canonical type field. 1458 QualType Canonical; 1459 if (!vecType.isCanonical()) { 1460 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1461 1462 // Get the new insert position for the node we care about. 1463 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1464 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1465 } 1466 ExtVectorType *New = new (*this, TypeAlignment) 1467 ExtVectorType(vecType, NumElts, Canonical); 1468 VectorTypes.InsertNode(New, InsertPos); 1469 Types.push_back(New); 1470 return QualType(New, 0); 1471} 1472 1473QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1474 Expr *SizeExpr, 1475 SourceLocation AttrLoc) { 1476 llvm::FoldingSetNodeID ID; 1477 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1478 SizeExpr); 1479 1480 void *InsertPos = 0; 1481 DependentSizedExtVectorType *Canon 1482 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1483 DependentSizedExtVectorType *New; 1484 if (Canon) { 1485 // We already have a canonical version of this array type; use it as 1486 // the canonical type for a newly-built type. 1487 New = new (*this, TypeAlignment) 1488 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1489 SizeExpr, AttrLoc); 1490 } else { 1491 QualType CanonVecTy = getCanonicalType(vecType); 1492 if (CanonVecTy == vecType) { 1493 New = new (*this, TypeAlignment) 1494 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1495 AttrLoc); 1496 1497 DependentSizedExtVectorType *CanonCheck 1498 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1499 assert(!CanonCheck && "Dependent-sized ext_vector canonical type broken"); 1500 (void)CanonCheck; 1501 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1502 } else { 1503 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1504 SourceLocation()); 1505 New = new (*this, TypeAlignment) 1506 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1507 } 1508 } 1509 1510 Types.push_back(New); 1511 return QualType(New, 0); 1512} 1513 1514/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1515/// 1516QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, 1517 const FunctionType::ExtInfo &Info) { 1518 const CallingConv CallConv = Info.getCC(); 1519 // Unique functions, to guarantee there is only one function of a particular 1520 // structure. 1521 llvm::FoldingSetNodeID ID; 1522 FunctionNoProtoType::Profile(ID, ResultTy, Info); 1523 1524 void *InsertPos = 0; 1525 if (FunctionNoProtoType *FT = 1526 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1527 return QualType(FT, 0); 1528 1529 QualType Canonical; 1530 if (!ResultTy.isCanonical() || 1531 getCanonicalCallConv(CallConv) != CallConv) { 1532 Canonical = 1533 getFunctionNoProtoType(getCanonicalType(ResultTy), 1534 Info.withCallingConv(getCanonicalCallConv(CallConv))); 1535 1536 // Get the new insert position for the node we care about. 1537 FunctionNoProtoType *NewIP = 1538 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1539 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1540 } 1541 1542 FunctionNoProtoType *New = new (*this, TypeAlignment) 1543 FunctionNoProtoType(ResultTy, Canonical, Info); 1544 Types.push_back(New); 1545 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1546 return QualType(New, 0); 1547} 1548 1549/// getFunctionType - Return a normal function type with a typed argument 1550/// list. isVariadic indicates whether the argument list includes '...'. 1551QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1552 unsigned NumArgs, bool isVariadic, 1553 unsigned TypeQuals, bool hasExceptionSpec, 1554 bool hasAnyExceptionSpec, unsigned NumExs, 1555 const QualType *ExArray, 1556 const FunctionType::ExtInfo &Info) { 1557 const CallingConv CallConv= Info.getCC(); 1558 // Unique functions, to guarantee there is only one function of a particular 1559 // structure. 1560 llvm::FoldingSetNodeID ID; 1561 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1562 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1563 NumExs, ExArray, Info); 1564 1565 void *InsertPos = 0; 1566 if (FunctionProtoType *FTP = 1567 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1568 return QualType(FTP, 0); 1569 1570 // Determine whether the type being created is already canonical or not. 1571 bool isCanonical = !hasExceptionSpec && ResultTy.isCanonical(); 1572 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1573 if (!ArgArray[i].isCanonicalAsParam()) 1574 isCanonical = false; 1575 1576 // If this type isn't canonical, get the canonical version of it. 1577 // The exception spec is not part of the canonical type. 1578 QualType Canonical; 1579 if (!isCanonical || getCanonicalCallConv(CallConv) != CallConv) { 1580 llvm::SmallVector<QualType, 16> CanonicalArgs; 1581 CanonicalArgs.reserve(NumArgs); 1582 for (unsigned i = 0; i != NumArgs; ++i) 1583 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1584 1585 Canonical = getFunctionType(getCanonicalType(ResultTy), 1586 CanonicalArgs.data(), NumArgs, 1587 isVariadic, TypeQuals, false, 1588 false, 0, 0, 1589 Info.withCallingConv(getCanonicalCallConv(CallConv))); 1590 1591 // Get the new insert position for the node we care about. 1592 FunctionProtoType *NewIP = 1593 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1594 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1595 } 1596 1597 // FunctionProtoType objects are allocated with extra bytes after them 1598 // for two variable size arrays (for parameter and exception types) at the 1599 // end of them. 1600 FunctionProtoType *FTP = 1601 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1602 NumArgs*sizeof(QualType) + 1603 NumExs*sizeof(QualType), TypeAlignment); 1604 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1605 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1606 ExArray, NumExs, Canonical, Info); 1607 Types.push_back(FTP); 1608 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1609 return QualType(FTP, 0); 1610} 1611 1612#ifndef NDEBUG 1613static bool NeedsInjectedClassNameType(const RecordDecl *D) { 1614 if (!isa<CXXRecordDecl>(D)) return false; 1615 const CXXRecordDecl *RD = cast<CXXRecordDecl>(D); 1616 if (isa<ClassTemplatePartialSpecializationDecl>(RD)) 1617 return true; 1618 if (RD->getDescribedClassTemplate() && 1619 !isa<ClassTemplateSpecializationDecl>(RD)) 1620 return true; 1621 return false; 1622} 1623#endif 1624 1625/// getInjectedClassNameType - Return the unique reference to the 1626/// injected class name type for the specified templated declaration. 1627QualType ASTContext::getInjectedClassNameType(CXXRecordDecl *Decl, 1628 QualType TST) { 1629 assert(NeedsInjectedClassNameType(Decl)); 1630 if (Decl->TypeForDecl) { 1631 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1632 } else if (CXXRecordDecl *PrevDecl 1633 = cast_or_null<CXXRecordDecl>(Decl->getPreviousDeclaration())) { 1634 assert(PrevDecl->TypeForDecl && "previous declaration has no type"); 1635 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1636 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1637 } else { 1638 Decl->TypeForDecl = 1639 new (*this, TypeAlignment) InjectedClassNameType(Decl, TST); 1640 Types.push_back(Decl->TypeForDecl); 1641 } 1642 return QualType(Decl->TypeForDecl, 0); 1643} 1644 1645/// getTypeDeclType - Return the unique reference to the type for the 1646/// specified type declaration. 1647QualType ASTContext::getTypeDeclTypeSlow(const TypeDecl *Decl) { 1648 assert(Decl && "Passed null for Decl param"); 1649 assert(!Decl->TypeForDecl && "TypeForDecl present in slow case"); 1650 1651 if (const TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1652 return getTypedefType(Typedef); 1653 1654 assert(!isa<TemplateTypeParmDecl>(Decl) && 1655 "Template type parameter types are always available."); 1656 1657 if (const RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1658 assert(!Record->getPreviousDeclaration() && 1659 "struct/union has previous declaration"); 1660 assert(!NeedsInjectedClassNameType(Record)); 1661 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1662 } else if (const EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1663 assert(!Enum->getPreviousDeclaration() && 1664 "enum has previous declaration"); 1665 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1666 } else if (const UnresolvedUsingTypenameDecl *Using = 1667 dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) { 1668 Decl->TypeForDecl = new (*this, TypeAlignment) UnresolvedUsingType(Using); 1669 } else 1670 llvm_unreachable("TypeDecl without a type?"); 1671 1672 Types.push_back(Decl->TypeForDecl); 1673 return QualType(Decl->TypeForDecl, 0); 1674} 1675 1676/// getTypedefType - Return the unique reference to the type for the 1677/// specified typename decl. 1678QualType ASTContext::getTypedefType(const TypedefDecl *Decl) { 1679 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1680 1681 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1682 Decl->TypeForDecl = new(*this, TypeAlignment) 1683 TypedefType(Type::Typedef, Decl, Canonical); 1684 Types.push_back(Decl->TypeForDecl); 1685 return QualType(Decl->TypeForDecl, 0); 1686} 1687 1688/// \brief Retrieve a substitution-result type. 1689QualType 1690ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1691 QualType Replacement) { 1692 assert(Replacement.isCanonical() 1693 && "replacement types must always be canonical"); 1694 1695 llvm::FoldingSetNodeID ID; 1696 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1697 void *InsertPos = 0; 1698 SubstTemplateTypeParmType *SubstParm 1699 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1700 1701 if (!SubstParm) { 1702 SubstParm = new (*this, TypeAlignment) 1703 SubstTemplateTypeParmType(Parm, Replacement); 1704 Types.push_back(SubstParm); 1705 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1706 } 1707 1708 return QualType(SubstParm, 0); 1709} 1710 1711/// \brief Retrieve the template type parameter type for a template 1712/// parameter or parameter pack with the given depth, index, and (optionally) 1713/// name. 1714QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1715 bool ParameterPack, 1716 IdentifierInfo *Name) { 1717 llvm::FoldingSetNodeID ID; 1718 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1719 void *InsertPos = 0; 1720 TemplateTypeParmType *TypeParm 1721 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1722 1723 if (TypeParm) 1724 return QualType(TypeParm, 0); 1725 1726 if (Name) { 1727 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1728 TypeParm = new (*this, TypeAlignment) 1729 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1730 1731 TemplateTypeParmType *TypeCheck 1732 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1733 assert(!TypeCheck && "Template type parameter canonical type broken"); 1734 (void)TypeCheck; 1735 } else 1736 TypeParm = new (*this, TypeAlignment) 1737 TemplateTypeParmType(Depth, Index, ParameterPack); 1738 1739 Types.push_back(TypeParm); 1740 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1741 1742 return QualType(TypeParm, 0); 1743} 1744 1745TypeSourceInfo * 1746ASTContext::getTemplateSpecializationTypeInfo(TemplateName Name, 1747 SourceLocation NameLoc, 1748 const TemplateArgumentListInfo &Args, 1749 QualType CanonType) { 1750 QualType TST = getTemplateSpecializationType(Name, Args, CanonType); 1751 1752 TypeSourceInfo *DI = CreateTypeSourceInfo(TST); 1753 TemplateSpecializationTypeLoc TL 1754 = cast<TemplateSpecializationTypeLoc>(DI->getTypeLoc()); 1755 TL.setTemplateNameLoc(NameLoc); 1756 TL.setLAngleLoc(Args.getLAngleLoc()); 1757 TL.setRAngleLoc(Args.getRAngleLoc()); 1758 for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i) 1759 TL.setArgLocInfo(i, Args[i].getLocInfo()); 1760 return DI; 1761} 1762 1763QualType 1764ASTContext::getTemplateSpecializationType(TemplateName Template, 1765 const TemplateArgumentListInfo &Args, 1766 QualType Canon, 1767 bool IsCurrentInstantiation) { 1768 unsigned NumArgs = Args.size(); 1769 1770 llvm::SmallVector<TemplateArgument, 4> ArgVec; 1771 ArgVec.reserve(NumArgs); 1772 for (unsigned i = 0; i != NumArgs; ++i) 1773 ArgVec.push_back(Args[i].getArgument()); 1774 1775 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, 1776 Canon, IsCurrentInstantiation); 1777} 1778 1779QualType 1780ASTContext::getTemplateSpecializationType(TemplateName Template, 1781 const TemplateArgument *Args, 1782 unsigned NumArgs, 1783 QualType Canon, 1784 bool IsCurrentInstantiation) { 1785 if (!Canon.isNull()) 1786 Canon = getCanonicalType(Canon); 1787 else { 1788 assert(!IsCurrentInstantiation && 1789 "current-instantiation specializations should always " 1790 "have a canonical type"); 1791 1792 // Build the canonical template specialization type. 1793 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1794 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1795 CanonArgs.reserve(NumArgs); 1796 for (unsigned I = 0; I != NumArgs; ++I) 1797 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1798 1799 // Determine whether this canonical template specialization type already 1800 // exists. 1801 llvm::FoldingSetNodeID ID; 1802 TemplateSpecializationType::Profile(ID, CanonTemplate, false, 1803 CanonArgs.data(), NumArgs, *this); 1804 1805 void *InsertPos = 0; 1806 TemplateSpecializationType *Spec 1807 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1808 1809 if (!Spec) { 1810 // Allocate a new canonical template specialization type. 1811 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1812 sizeof(TemplateArgument) * NumArgs), 1813 TypeAlignment); 1814 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, false, 1815 CanonArgs.data(), NumArgs, 1816 Canon); 1817 Types.push_back(Spec); 1818 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1819 } 1820 1821 if (Canon.isNull()) 1822 Canon = QualType(Spec, 0); 1823 assert(Canon->isDependentType() && 1824 "Non-dependent template-id type must have a canonical type"); 1825 } 1826 1827 // Allocate the (non-canonical) template specialization type, but don't 1828 // try to unique it: these types typically have location information that 1829 // we don't unique and don't want to lose. 1830 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1831 sizeof(TemplateArgument) * NumArgs), 1832 TypeAlignment); 1833 TemplateSpecializationType *Spec 1834 = new (Mem) TemplateSpecializationType(*this, Template, 1835 IsCurrentInstantiation, 1836 Args, NumArgs, 1837 Canon); 1838 1839 Types.push_back(Spec); 1840 return QualType(Spec, 0); 1841} 1842 1843QualType 1844ASTContext::getElaboratedType(ElaboratedTypeKeyword Keyword, 1845 NestedNameSpecifier *NNS, 1846 QualType NamedType) { 1847 llvm::FoldingSetNodeID ID; 1848 ElaboratedType::Profile(ID, Keyword, NNS, NamedType); 1849 1850 void *InsertPos = 0; 1851 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 1852 if (T) 1853 return QualType(T, 0); 1854 1855 QualType Canon = NamedType; 1856 if (!Canon.isCanonical()) { 1857 Canon = getCanonicalType(NamedType); 1858 ElaboratedType *CheckT = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 1859 assert(!CheckT && "Elaborated canonical type broken"); 1860 (void)CheckT; 1861 } 1862 1863 T = new (*this) ElaboratedType(Keyword, NNS, NamedType, Canon); 1864 Types.push_back(T); 1865 ElaboratedTypes.InsertNode(T, InsertPos); 1866 return QualType(T, 0); 1867} 1868 1869QualType ASTContext::getDependentNameType(ElaboratedTypeKeyword Keyword, 1870 NestedNameSpecifier *NNS, 1871 const IdentifierInfo *Name, 1872 QualType Canon) { 1873 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1874 1875 if (Canon.isNull()) { 1876 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1877 ElaboratedTypeKeyword CanonKeyword = Keyword; 1878 if (Keyword == ETK_None) 1879 CanonKeyword = ETK_Typename; 1880 1881 if (CanonNNS != NNS || CanonKeyword != Keyword) 1882 Canon = getDependentNameType(CanonKeyword, CanonNNS, Name); 1883 } 1884 1885 llvm::FoldingSetNodeID ID; 1886 DependentNameType::Profile(ID, Keyword, NNS, Name); 1887 1888 void *InsertPos = 0; 1889 DependentNameType *T 1890 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1891 if (T) 1892 return QualType(T, 0); 1893 1894 T = new (*this) DependentNameType(Keyword, NNS, Name, Canon); 1895 Types.push_back(T); 1896 DependentNameTypes.InsertNode(T, InsertPos); 1897 return QualType(T, 0); 1898} 1899 1900QualType 1901ASTContext::getDependentNameType(ElaboratedTypeKeyword Keyword, 1902 NestedNameSpecifier *NNS, 1903 const TemplateSpecializationType *TemplateId, 1904 QualType Canon) { 1905 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1906 1907 llvm::FoldingSetNodeID ID; 1908 DependentNameType::Profile(ID, Keyword, NNS, TemplateId); 1909 1910 void *InsertPos = 0; 1911 DependentNameType *T 1912 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1913 if (T) 1914 return QualType(T, 0); 1915 1916 if (Canon.isNull()) { 1917 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1918 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1919 ElaboratedTypeKeyword CanonKeyword = Keyword; 1920 if (Keyword == ETK_None) 1921 CanonKeyword = ETK_Typename; 1922 if (CanonNNS != NNS || CanonKeyword != Keyword || 1923 CanonType != QualType(TemplateId, 0)) { 1924 const TemplateSpecializationType *CanonTemplateId 1925 = CanonType->getAs<TemplateSpecializationType>(); 1926 assert(CanonTemplateId && 1927 "Canonical type must also be a template specialization type"); 1928 Canon = getDependentNameType(CanonKeyword, CanonNNS, CanonTemplateId); 1929 } 1930 1931 DependentNameType *CheckT 1932 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1933 assert(!CheckT && "Typename canonical type is broken"); (void)CheckT; 1934 } 1935 1936 T = new (*this) DependentNameType(Keyword, NNS, TemplateId, Canon); 1937 Types.push_back(T); 1938 DependentNameTypes.InsertNode(T, InsertPos); 1939 return QualType(T, 0); 1940} 1941 1942/// CmpProtocolNames - Comparison predicate for sorting protocols 1943/// alphabetically. 1944static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1945 const ObjCProtocolDecl *RHS) { 1946 return LHS->getDeclName() < RHS->getDeclName(); 1947} 1948 1949static bool areSortedAndUniqued(ObjCProtocolDecl * const *Protocols, 1950 unsigned NumProtocols) { 1951 if (NumProtocols == 0) return true; 1952 1953 for (unsigned i = 1; i != NumProtocols; ++i) 1954 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 1955 return false; 1956 return true; 1957} 1958 1959static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 1960 unsigned &NumProtocols) { 1961 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1962 1963 // Sort protocols, keyed by name. 1964 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1965 1966 // Remove duplicates. 1967 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1968 NumProtocols = ProtocolsEnd-Protocols; 1969} 1970 1971QualType ASTContext::getObjCObjectType(QualType BaseType, 1972 ObjCProtocolDecl * const *Protocols, 1973 unsigned NumProtocols) { 1974 // If the base type is an interface and there aren't any protocols 1975 // to add, then the interface type will do just fine. 1976 if (!NumProtocols && isa<ObjCInterfaceType>(BaseType)) 1977 return BaseType; 1978 1979 // Look in the folding set for an existing type. 1980 llvm::FoldingSetNodeID ID; 1981 ObjCObjectTypeImpl::Profile(ID, BaseType, Protocols, NumProtocols); 1982 void *InsertPos = 0; 1983 if (ObjCObjectType *QT = ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos)) 1984 return QualType(QT, 0); 1985 1986 // Build the canonical type, which has the canonical base type and 1987 // a sorted-and-uniqued list of protocols. 1988 QualType Canonical; 1989 bool ProtocolsSorted = areSortedAndUniqued(Protocols, NumProtocols); 1990 if (!ProtocolsSorted || !BaseType.isCanonical()) { 1991 if (!ProtocolsSorted) { 1992 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(Protocols, 1993 Protocols + NumProtocols); 1994 unsigned UniqueCount = NumProtocols; 1995 1996 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 1997 Canonical = getObjCObjectType(getCanonicalType(BaseType), 1998 &Sorted[0], UniqueCount); 1999 } else { 2000 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2001 Protocols, NumProtocols); 2002 } 2003 2004 // Regenerate InsertPos. 2005 ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos); 2006 } 2007 2008 unsigned Size = sizeof(ObjCObjectTypeImpl); 2009 Size += NumProtocols * sizeof(ObjCProtocolDecl *); 2010 void *Mem = Allocate(Size, TypeAlignment); 2011 ObjCObjectTypeImpl *T = 2012 new (Mem) ObjCObjectTypeImpl(Canonical, BaseType, Protocols, NumProtocols); 2013 2014 Types.push_back(T); 2015 ObjCObjectTypes.InsertNode(T, InsertPos); 2016 return QualType(T, 0); 2017} 2018 2019/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2020/// the given object type. 2021QualType ASTContext::getObjCObjectPointerType(QualType ObjectT) { 2022 llvm::FoldingSetNodeID ID; 2023 ObjCObjectPointerType::Profile(ID, ObjectT); 2024 2025 void *InsertPos = 0; 2026 if (ObjCObjectPointerType *QT = 2027 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2028 return QualType(QT, 0); 2029 2030 // Find the canonical object type. 2031 QualType Canonical; 2032 if (!ObjectT.isCanonical()) { 2033 Canonical = getObjCObjectPointerType(getCanonicalType(ObjectT)); 2034 2035 // Regenerate InsertPos. 2036 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2037 } 2038 2039 // No match. 2040 void *Mem = Allocate(sizeof(ObjCObjectPointerType), TypeAlignment); 2041 ObjCObjectPointerType *QType = 2042 new (Mem) ObjCObjectPointerType(Canonical, ObjectT); 2043 2044 Types.push_back(QType); 2045 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2046 return QualType(QType, 0); 2047} 2048 2049/// getObjCInterfaceType - Return the unique reference to the type for the 2050/// specified ObjC interface decl. The list of protocols is optional. 2051QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) { 2052 if (Decl->TypeForDecl) 2053 return QualType(Decl->TypeForDecl, 0); 2054 2055 // FIXME: redeclarations? 2056 void *Mem = Allocate(sizeof(ObjCInterfaceType), TypeAlignment); 2057 ObjCInterfaceType *T = new (Mem) ObjCInterfaceType(Decl); 2058 Decl->TypeForDecl = T; 2059 Types.push_back(T); 2060 return QualType(T, 0); 2061} 2062 2063/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2064/// TypeOfExprType AST's (since expression's are never shared). For example, 2065/// multiple declarations that refer to "typeof(x)" all contain different 2066/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2067/// on canonical type's (which are always unique). 2068QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2069 TypeOfExprType *toe; 2070 if (tofExpr->isTypeDependent()) { 2071 llvm::FoldingSetNodeID ID; 2072 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2073 2074 void *InsertPos = 0; 2075 DependentTypeOfExprType *Canon 2076 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2077 if (Canon) { 2078 // We already have a "canonical" version of an identical, dependent 2079 // typeof(expr) type. Use that as our canonical type. 2080 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2081 QualType((TypeOfExprType*)Canon, 0)); 2082 } 2083 else { 2084 // Build a new, canonical typeof(expr) type. 2085 Canon 2086 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2087 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2088 toe = Canon; 2089 } 2090 } else { 2091 QualType Canonical = getCanonicalType(tofExpr->getType()); 2092 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2093 } 2094 Types.push_back(toe); 2095 return QualType(toe, 0); 2096} 2097 2098/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2099/// TypeOfType AST's. The only motivation to unique these nodes would be 2100/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2101/// an issue. This doesn't effect the type checker, since it operates 2102/// on canonical type's (which are always unique). 2103QualType ASTContext::getTypeOfType(QualType tofType) { 2104 QualType Canonical = getCanonicalType(tofType); 2105 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2106 Types.push_back(tot); 2107 return QualType(tot, 0); 2108} 2109 2110/// getDecltypeForExpr - Given an expr, will return the decltype for that 2111/// expression, according to the rules in C++0x [dcl.type.simple]p4 2112static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2113 if (e->isTypeDependent()) 2114 return Context.DependentTy; 2115 2116 // If e is an id expression or a class member access, decltype(e) is defined 2117 // as the type of the entity named by e. 2118 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2119 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2120 return VD->getType(); 2121 } 2122 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2123 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2124 return FD->getType(); 2125 } 2126 // If e is a function call or an invocation of an overloaded operator, 2127 // (parentheses around e are ignored), decltype(e) is defined as the 2128 // return type of that function. 2129 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2130 return CE->getCallReturnType(); 2131 2132 QualType T = e->getType(); 2133 2134 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2135 // defined as T&, otherwise decltype(e) is defined as T. 2136 if (e->isLvalue(Context) == Expr::LV_Valid) 2137 T = Context.getLValueReferenceType(T); 2138 2139 return T; 2140} 2141 2142/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2143/// DecltypeType AST's. The only motivation to unique these nodes would be 2144/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2145/// an issue. This doesn't effect the type checker, since it operates 2146/// on canonical type's (which are always unique). 2147QualType ASTContext::getDecltypeType(Expr *e) { 2148 DecltypeType *dt; 2149 if (e->isTypeDependent()) { 2150 llvm::FoldingSetNodeID ID; 2151 DependentDecltypeType::Profile(ID, *this, e); 2152 2153 void *InsertPos = 0; 2154 DependentDecltypeType *Canon 2155 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2156 if (Canon) { 2157 // We already have a "canonical" version of an equivalent, dependent 2158 // decltype type. Use that as our canonical type. 2159 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2160 QualType((DecltypeType*)Canon, 0)); 2161 } 2162 else { 2163 // Build a new, canonical typeof(expr) type. 2164 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2165 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2166 dt = Canon; 2167 } 2168 } else { 2169 QualType T = getDecltypeForExpr(e, *this); 2170 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2171 } 2172 Types.push_back(dt); 2173 return QualType(dt, 0); 2174} 2175 2176/// getTagDeclType - Return the unique reference to the type for the 2177/// specified TagDecl (struct/union/class/enum) decl. 2178QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2179 assert (Decl); 2180 // FIXME: What is the design on getTagDeclType when it requires casting 2181 // away const? mutable? 2182 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2183} 2184 2185/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2186/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2187/// needs to agree with the definition in <stddef.h>. 2188CanQualType ASTContext::getSizeType() const { 2189 return getFromTargetType(Target.getSizeType()); 2190} 2191 2192/// getSignedWCharType - Return the type of "signed wchar_t". 2193/// Used when in C++, as a GCC extension. 2194QualType ASTContext::getSignedWCharType() const { 2195 // FIXME: derive from "Target" ? 2196 return WCharTy; 2197} 2198 2199/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2200/// Used when in C++, as a GCC extension. 2201QualType ASTContext::getUnsignedWCharType() const { 2202 // FIXME: derive from "Target" ? 2203 return UnsignedIntTy; 2204} 2205 2206/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2207/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2208QualType ASTContext::getPointerDiffType() const { 2209 return getFromTargetType(Target.getPtrDiffType(0)); 2210} 2211 2212//===----------------------------------------------------------------------===// 2213// Type Operators 2214//===----------------------------------------------------------------------===// 2215 2216CanQualType ASTContext::getCanonicalParamType(QualType T) { 2217 // Push qualifiers into arrays, and then discard any remaining 2218 // qualifiers. 2219 T = getCanonicalType(T); 2220 const Type *Ty = T.getTypePtr(); 2221 2222 QualType Result; 2223 if (isa<ArrayType>(Ty)) { 2224 Result = getArrayDecayedType(QualType(Ty,0)); 2225 } else if (isa<FunctionType>(Ty)) { 2226 Result = getPointerType(QualType(Ty, 0)); 2227 } else { 2228 Result = QualType(Ty, 0); 2229 } 2230 2231 return CanQualType::CreateUnsafe(Result); 2232} 2233 2234/// getCanonicalType - Return the canonical (structural) type corresponding to 2235/// the specified potentially non-canonical type. The non-canonical version 2236/// of a type may have many "decorated" versions of types. Decorators can 2237/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2238/// to be free of any of these, allowing two canonical types to be compared 2239/// for exact equality with a simple pointer comparison. 2240CanQualType ASTContext::getCanonicalType(QualType T) { 2241 QualifierCollector Quals; 2242 const Type *Ptr = Quals.strip(T); 2243 QualType CanType = Ptr->getCanonicalTypeInternal(); 2244 2245 // The canonical internal type will be the canonical type *except* 2246 // that we push type qualifiers down through array types. 2247 2248 // If there are no new qualifiers to push down, stop here. 2249 if (!Quals.hasQualifiers()) 2250 return CanQualType::CreateUnsafe(CanType); 2251 2252 // If the type qualifiers are on an array type, get the canonical 2253 // type of the array with the qualifiers applied to the element 2254 // type. 2255 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2256 if (!AT) 2257 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2258 2259 // Get the canonical version of the element with the extra qualifiers on it. 2260 // This can recursively sink qualifiers through multiple levels of arrays. 2261 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2262 NewEltTy = getCanonicalType(NewEltTy); 2263 2264 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2265 return CanQualType::CreateUnsafe( 2266 getConstantArrayType(NewEltTy, CAT->getSize(), 2267 CAT->getSizeModifier(), 2268 CAT->getIndexTypeCVRQualifiers())); 2269 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2270 return CanQualType::CreateUnsafe( 2271 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2272 IAT->getIndexTypeCVRQualifiers())); 2273 2274 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2275 return CanQualType::CreateUnsafe( 2276 getDependentSizedArrayType(NewEltTy, 2277 DSAT->getSizeExpr() ? 2278 DSAT->getSizeExpr()->Retain() : 0, 2279 DSAT->getSizeModifier(), 2280 DSAT->getIndexTypeCVRQualifiers(), 2281 DSAT->getBracketsRange())->getCanonicalTypeInternal()); 2282 2283 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2284 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2285 VAT->getSizeExpr() ? 2286 VAT->getSizeExpr()->Retain() : 0, 2287 VAT->getSizeModifier(), 2288 VAT->getIndexTypeCVRQualifiers(), 2289 VAT->getBracketsRange())); 2290} 2291 2292QualType ASTContext::getUnqualifiedArrayType(QualType T, 2293 Qualifiers &Quals) { 2294 Quals = T.getQualifiers(); 2295 const ArrayType *AT = getAsArrayType(T); 2296 if (!AT) { 2297 return T.getUnqualifiedType(); 2298 } 2299 2300 QualType Elt = AT->getElementType(); 2301 QualType UnqualElt = getUnqualifiedArrayType(Elt, Quals); 2302 if (Elt == UnqualElt) 2303 return T; 2304 2305 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) { 2306 return getConstantArrayType(UnqualElt, CAT->getSize(), 2307 CAT->getSizeModifier(), 0); 2308 } 2309 2310 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 2311 return getIncompleteArrayType(UnqualElt, IAT->getSizeModifier(), 0); 2312 } 2313 2314 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(AT)) { 2315 return getVariableArrayType(UnqualElt, 2316 VAT->getSizeExpr() ? 2317 VAT->getSizeExpr()->Retain() : 0, 2318 VAT->getSizeModifier(), 2319 VAT->getIndexTypeCVRQualifiers(), 2320 VAT->getBracketsRange()); 2321 } 2322 2323 const DependentSizedArrayType *DSAT = cast<DependentSizedArrayType>(AT); 2324 return getDependentSizedArrayType(UnqualElt, DSAT->getSizeExpr()->Retain(), 2325 DSAT->getSizeModifier(), 0, 2326 SourceRange()); 2327} 2328 2329DeclarationName ASTContext::getNameForTemplate(TemplateName Name) { 2330 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2331 return TD->getDeclName(); 2332 2333 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2334 if (DTN->isIdentifier()) { 2335 return DeclarationNames.getIdentifier(DTN->getIdentifier()); 2336 } else { 2337 return DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2338 } 2339 } 2340 2341 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2342 assert(Storage); 2343 return (*Storage->begin())->getDeclName(); 2344} 2345 2346TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2347 // If this template name refers to a template, the canonical 2348 // template name merely stores the template itself. 2349 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2350 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2351 2352 assert(!Name.getAsOverloadedTemplate()); 2353 2354 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2355 assert(DTN && "Non-dependent template names must refer to template decls."); 2356 return DTN->CanonicalTemplateName; 2357} 2358 2359bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2360 X = getCanonicalTemplateName(X); 2361 Y = getCanonicalTemplateName(Y); 2362 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2363} 2364 2365TemplateArgument 2366ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2367 switch (Arg.getKind()) { 2368 case TemplateArgument::Null: 2369 return Arg; 2370 2371 case TemplateArgument::Expression: 2372 return Arg; 2373 2374 case TemplateArgument::Declaration: 2375 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2376 2377 case TemplateArgument::Template: 2378 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2379 2380 case TemplateArgument::Integral: 2381 return TemplateArgument(*Arg.getAsIntegral(), 2382 getCanonicalType(Arg.getIntegralType())); 2383 2384 case TemplateArgument::Type: 2385 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2386 2387 case TemplateArgument::Pack: { 2388 // FIXME: Allocate in ASTContext 2389 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2390 unsigned Idx = 0; 2391 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2392 AEnd = Arg.pack_end(); 2393 A != AEnd; (void)++A, ++Idx) 2394 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2395 2396 TemplateArgument Result; 2397 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2398 return Result; 2399 } 2400 } 2401 2402 // Silence GCC warning 2403 assert(false && "Unhandled template argument kind"); 2404 return TemplateArgument(); 2405} 2406 2407NestedNameSpecifier * 2408ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2409 if (!NNS) 2410 return 0; 2411 2412 switch (NNS->getKind()) { 2413 case NestedNameSpecifier::Identifier: 2414 // Canonicalize the prefix but keep the identifier the same. 2415 return NestedNameSpecifier::Create(*this, 2416 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2417 NNS->getAsIdentifier()); 2418 2419 case NestedNameSpecifier::Namespace: 2420 // A namespace is canonical; build a nested-name-specifier with 2421 // this namespace and no prefix. 2422 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2423 2424 case NestedNameSpecifier::TypeSpec: 2425 case NestedNameSpecifier::TypeSpecWithTemplate: { 2426 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2427 return NestedNameSpecifier::Create(*this, 0, 2428 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2429 T.getTypePtr()); 2430 } 2431 2432 case NestedNameSpecifier::Global: 2433 // The global specifier is canonical and unique. 2434 return NNS; 2435 } 2436 2437 // Required to silence a GCC warning 2438 return 0; 2439} 2440 2441 2442const ArrayType *ASTContext::getAsArrayType(QualType T) { 2443 // Handle the non-qualified case efficiently. 2444 if (!T.hasLocalQualifiers()) { 2445 // Handle the common positive case fast. 2446 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2447 return AT; 2448 } 2449 2450 // Handle the common negative case fast. 2451 QualType CType = T->getCanonicalTypeInternal(); 2452 if (!isa<ArrayType>(CType)) 2453 return 0; 2454 2455 // Apply any qualifiers from the array type to the element type. This 2456 // implements C99 6.7.3p8: "If the specification of an array type includes 2457 // any type qualifiers, the element type is so qualified, not the array type." 2458 2459 // If we get here, we either have type qualifiers on the type, or we have 2460 // sugar such as a typedef in the way. If we have type qualifiers on the type 2461 // we must propagate them down into the element type. 2462 2463 QualifierCollector Qs; 2464 const Type *Ty = Qs.strip(T.getDesugaredType()); 2465 2466 // If we have a simple case, just return now. 2467 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2468 if (ATy == 0 || Qs.empty()) 2469 return ATy; 2470 2471 // Otherwise, we have an array and we have qualifiers on it. Push the 2472 // qualifiers into the array element type and return a new array type. 2473 // Get the canonical version of the element with the extra qualifiers on it. 2474 // This can recursively sink qualifiers through multiple levels of arrays. 2475 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2476 2477 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2478 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2479 CAT->getSizeModifier(), 2480 CAT->getIndexTypeCVRQualifiers())); 2481 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2482 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2483 IAT->getSizeModifier(), 2484 IAT->getIndexTypeCVRQualifiers())); 2485 2486 if (const DependentSizedArrayType *DSAT 2487 = dyn_cast<DependentSizedArrayType>(ATy)) 2488 return cast<ArrayType>( 2489 getDependentSizedArrayType(NewEltTy, 2490 DSAT->getSizeExpr() ? 2491 DSAT->getSizeExpr()->Retain() : 0, 2492 DSAT->getSizeModifier(), 2493 DSAT->getIndexTypeCVRQualifiers(), 2494 DSAT->getBracketsRange())); 2495 2496 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2497 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2498 VAT->getSizeExpr() ? 2499 VAT->getSizeExpr()->Retain() : 0, 2500 VAT->getSizeModifier(), 2501 VAT->getIndexTypeCVRQualifiers(), 2502 VAT->getBracketsRange())); 2503} 2504 2505 2506/// getArrayDecayedType - Return the properly qualified result of decaying the 2507/// specified array type to a pointer. This operation is non-trivial when 2508/// handling typedefs etc. The canonical type of "T" must be an array type, 2509/// this returns a pointer to a properly qualified element of the array. 2510/// 2511/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2512QualType ASTContext::getArrayDecayedType(QualType Ty) { 2513 // Get the element type with 'getAsArrayType' so that we don't lose any 2514 // typedefs in the element type of the array. This also handles propagation 2515 // of type qualifiers from the array type into the element type if present 2516 // (C99 6.7.3p8). 2517 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2518 assert(PrettyArrayType && "Not an array type!"); 2519 2520 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2521 2522 // int x[restrict 4] -> int *restrict 2523 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2524} 2525 2526QualType ASTContext::getBaseElementType(QualType QT) { 2527 QualifierCollector Qs; 2528 while (const ArrayType *AT = getAsArrayType(QualType(Qs.strip(QT), 0))) 2529 QT = AT->getElementType(); 2530 return Qs.apply(QT); 2531} 2532 2533QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2534 QualType ElemTy = AT->getElementType(); 2535 2536 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2537 return getBaseElementType(AT); 2538 2539 return ElemTy; 2540} 2541 2542/// getConstantArrayElementCount - Returns number of constant array elements. 2543uint64_t 2544ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2545 uint64_t ElementCount = 1; 2546 do { 2547 ElementCount *= CA->getSize().getZExtValue(); 2548 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2549 } while (CA); 2550 return ElementCount; 2551} 2552 2553/// getFloatingRank - Return a relative rank for floating point types. 2554/// This routine will assert if passed a built-in type that isn't a float. 2555static FloatingRank getFloatingRank(QualType T) { 2556 if (const ComplexType *CT = T->getAs<ComplexType>()) 2557 return getFloatingRank(CT->getElementType()); 2558 2559 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2560 switch (T->getAs<BuiltinType>()->getKind()) { 2561 default: assert(0 && "getFloatingRank(): not a floating type"); 2562 case BuiltinType::Float: return FloatRank; 2563 case BuiltinType::Double: return DoubleRank; 2564 case BuiltinType::LongDouble: return LongDoubleRank; 2565 } 2566} 2567 2568/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2569/// point or a complex type (based on typeDomain/typeSize). 2570/// 'typeDomain' is a real floating point or complex type. 2571/// 'typeSize' is a real floating point or complex type. 2572QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2573 QualType Domain) const { 2574 FloatingRank EltRank = getFloatingRank(Size); 2575 if (Domain->isComplexType()) { 2576 switch (EltRank) { 2577 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2578 case FloatRank: return FloatComplexTy; 2579 case DoubleRank: return DoubleComplexTy; 2580 case LongDoubleRank: return LongDoubleComplexTy; 2581 } 2582 } 2583 2584 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2585 switch (EltRank) { 2586 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2587 case FloatRank: return FloatTy; 2588 case DoubleRank: return DoubleTy; 2589 case LongDoubleRank: return LongDoubleTy; 2590 } 2591} 2592 2593/// getFloatingTypeOrder - Compare the rank of the two specified floating 2594/// point types, ignoring the domain of the type (i.e. 'double' == 2595/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2596/// LHS < RHS, return -1. 2597int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2598 FloatingRank LHSR = getFloatingRank(LHS); 2599 FloatingRank RHSR = getFloatingRank(RHS); 2600 2601 if (LHSR == RHSR) 2602 return 0; 2603 if (LHSR > RHSR) 2604 return 1; 2605 return -1; 2606} 2607 2608/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2609/// routine will assert if passed a built-in type that isn't an integer or enum, 2610/// or if it is not canonicalized. 2611unsigned ASTContext::getIntegerRank(Type *T) { 2612 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 2613 if (EnumType* ET = dyn_cast<EnumType>(T)) 2614 T = ET->getDecl()->getPromotionType().getTypePtr(); 2615 2616 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2617 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2618 2619 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2620 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2621 2622 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2623 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2624 2625 switch (cast<BuiltinType>(T)->getKind()) { 2626 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2627 case BuiltinType::Bool: 2628 return 1 + (getIntWidth(BoolTy) << 3); 2629 case BuiltinType::Char_S: 2630 case BuiltinType::Char_U: 2631 case BuiltinType::SChar: 2632 case BuiltinType::UChar: 2633 return 2 + (getIntWidth(CharTy) << 3); 2634 case BuiltinType::Short: 2635 case BuiltinType::UShort: 2636 return 3 + (getIntWidth(ShortTy) << 3); 2637 case BuiltinType::Int: 2638 case BuiltinType::UInt: 2639 return 4 + (getIntWidth(IntTy) << 3); 2640 case BuiltinType::Long: 2641 case BuiltinType::ULong: 2642 return 5 + (getIntWidth(LongTy) << 3); 2643 case BuiltinType::LongLong: 2644 case BuiltinType::ULongLong: 2645 return 6 + (getIntWidth(LongLongTy) << 3); 2646 case BuiltinType::Int128: 2647 case BuiltinType::UInt128: 2648 return 7 + (getIntWidth(Int128Ty) << 3); 2649 } 2650} 2651 2652/// \brief Whether this is a promotable bitfield reference according 2653/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2654/// 2655/// \returns the type this bit-field will promote to, or NULL if no 2656/// promotion occurs. 2657QualType ASTContext::isPromotableBitField(Expr *E) { 2658 if (E->isTypeDependent() || E->isValueDependent()) 2659 return QualType(); 2660 2661 FieldDecl *Field = E->getBitField(); 2662 if (!Field) 2663 return QualType(); 2664 2665 QualType FT = Field->getType(); 2666 2667 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2668 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2669 uint64_t IntSize = getTypeSize(IntTy); 2670 // GCC extension compatibility: if the bit-field size is less than or equal 2671 // to the size of int, it gets promoted no matter what its type is. 2672 // For instance, unsigned long bf : 4 gets promoted to signed int. 2673 if (BitWidth < IntSize) 2674 return IntTy; 2675 2676 if (BitWidth == IntSize) 2677 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2678 2679 // Types bigger than int are not subject to promotions, and therefore act 2680 // like the base type. 2681 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2682 // is ridiculous. 2683 return QualType(); 2684} 2685 2686/// getPromotedIntegerType - Returns the type that Promotable will 2687/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2688/// integer type. 2689QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2690 assert(!Promotable.isNull()); 2691 assert(Promotable->isPromotableIntegerType()); 2692 if (const EnumType *ET = Promotable->getAs<EnumType>()) 2693 return ET->getDecl()->getPromotionType(); 2694 if (Promotable->isSignedIntegerType()) 2695 return IntTy; 2696 uint64_t PromotableSize = getTypeSize(Promotable); 2697 uint64_t IntSize = getTypeSize(IntTy); 2698 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2699 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2700} 2701 2702/// getIntegerTypeOrder - Returns the highest ranked integer type: 2703/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2704/// LHS < RHS, return -1. 2705int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2706 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2707 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2708 if (LHSC == RHSC) return 0; 2709 2710 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2711 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2712 2713 unsigned LHSRank = getIntegerRank(LHSC); 2714 unsigned RHSRank = getIntegerRank(RHSC); 2715 2716 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2717 if (LHSRank == RHSRank) return 0; 2718 return LHSRank > RHSRank ? 1 : -1; 2719 } 2720 2721 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2722 if (LHSUnsigned) { 2723 // If the unsigned [LHS] type is larger, return it. 2724 if (LHSRank >= RHSRank) 2725 return 1; 2726 2727 // If the signed type can represent all values of the unsigned type, it 2728 // wins. Because we are dealing with 2's complement and types that are 2729 // powers of two larger than each other, this is always safe. 2730 return -1; 2731 } 2732 2733 // If the unsigned [RHS] type is larger, return it. 2734 if (RHSRank >= LHSRank) 2735 return -1; 2736 2737 // If the signed type can represent all values of the unsigned type, it 2738 // wins. Because we are dealing with 2's complement and types that are 2739 // powers of two larger than each other, this is always safe. 2740 return 1; 2741} 2742 2743static RecordDecl * 2744CreateRecordDecl(ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 2745 SourceLocation L, IdentifierInfo *Id) { 2746 if (Ctx.getLangOptions().CPlusPlus) 2747 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 2748 else 2749 return RecordDecl::Create(Ctx, TK, DC, L, Id); 2750} 2751 2752// getCFConstantStringType - Return the type used for constant CFStrings. 2753QualType ASTContext::getCFConstantStringType() { 2754 if (!CFConstantStringTypeDecl) { 2755 CFConstantStringTypeDecl = 2756 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 2757 &Idents.get("NSConstantString")); 2758 CFConstantStringTypeDecl->startDefinition(); 2759 2760 QualType FieldTypes[4]; 2761 2762 // const int *isa; 2763 FieldTypes[0] = getPointerType(IntTy.withConst()); 2764 // int flags; 2765 FieldTypes[1] = IntTy; 2766 // const char *str; 2767 FieldTypes[2] = getPointerType(CharTy.withConst()); 2768 // long length; 2769 FieldTypes[3] = LongTy; 2770 2771 // Create fields 2772 for (unsigned i = 0; i < 4; ++i) { 2773 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2774 SourceLocation(), 0, 2775 FieldTypes[i], /*TInfo=*/0, 2776 /*BitWidth=*/0, 2777 /*Mutable=*/false); 2778 Field->setAccess(AS_public); 2779 CFConstantStringTypeDecl->addDecl(Field); 2780 } 2781 2782 CFConstantStringTypeDecl->completeDefinition(); 2783 } 2784 2785 return getTagDeclType(CFConstantStringTypeDecl); 2786} 2787 2788void ASTContext::setCFConstantStringType(QualType T) { 2789 const RecordType *Rec = T->getAs<RecordType>(); 2790 assert(Rec && "Invalid CFConstantStringType"); 2791 CFConstantStringTypeDecl = Rec->getDecl(); 2792} 2793 2794// getNSConstantStringType - Return the type used for constant NSStrings. 2795QualType ASTContext::getNSConstantStringType() { 2796 if (!NSConstantStringTypeDecl) { 2797 NSConstantStringTypeDecl = 2798 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 2799 &Idents.get("__builtin_NSString")); 2800 NSConstantStringTypeDecl->startDefinition(); 2801 2802 QualType FieldTypes[3]; 2803 2804 // const int *isa; 2805 FieldTypes[0] = getPointerType(IntTy.withConst()); 2806 // const char *str; 2807 FieldTypes[1] = getPointerType(CharTy.withConst()); 2808 // unsigned int length; 2809 FieldTypes[2] = UnsignedIntTy; 2810 2811 // Create fields 2812 for (unsigned i = 0; i < 3; ++i) { 2813 FieldDecl *Field = FieldDecl::Create(*this, NSConstantStringTypeDecl, 2814 SourceLocation(), 0, 2815 FieldTypes[i], /*TInfo=*/0, 2816 /*BitWidth=*/0, 2817 /*Mutable=*/false); 2818 Field->setAccess(AS_public); 2819 NSConstantStringTypeDecl->addDecl(Field); 2820 } 2821 2822 NSConstantStringTypeDecl->completeDefinition(); 2823 } 2824 2825 return getTagDeclType(NSConstantStringTypeDecl); 2826} 2827 2828void ASTContext::setNSConstantStringType(QualType T) { 2829 const RecordType *Rec = T->getAs<RecordType>(); 2830 assert(Rec && "Invalid NSConstantStringType"); 2831 NSConstantStringTypeDecl = Rec->getDecl(); 2832} 2833 2834QualType ASTContext::getObjCFastEnumerationStateType() { 2835 if (!ObjCFastEnumerationStateTypeDecl) { 2836 ObjCFastEnumerationStateTypeDecl = 2837 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 2838 &Idents.get("__objcFastEnumerationState")); 2839 ObjCFastEnumerationStateTypeDecl->startDefinition(); 2840 2841 QualType FieldTypes[] = { 2842 UnsignedLongTy, 2843 getPointerType(ObjCIdTypedefType), 2844 getPointerType(UnsignedLongTy), 2845 getConstantArrayType(UnsignedLongTy, 2846 llvm::APInt(32, 5), ArrayType::Normal, 0) 2847 }; 2848 2849 for (size_t i = 0; i < 4; ++i) { 2850 FieldDecl *Field = FieldDecl::Create(*this, 2851 ObjCFastEnumerationStateTypeDecl, 2852 SourceLocation(), 0, 2853 FieldTypes[i], /*TInfo=*/0, 2854 /*BitWidth=*/0, 2855 /*Mutable=*/false); 2856 Field->setAccess(AS_public); 2857 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2858 } 2859 if (getLangOptions().CPlusPlus) 2860 if (CXXRecordDecl *CXXRD = 2861 dyn_cast<CXXRecordDecl>(ObjCFastEnumerationStateTypeDecl)) 2862 CXXRD->setEmpty(false); 2863 2864 ObjCFastEnumerationStateTypeDecl->completeDefinition(); 2865 } 2866 2867 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2868} 2869 2870QualType ASTContext::getBlockDescriptorType() { 2871 if (BlockDescriptorType) 2872 return getTagDeclType(BlockDescriptorType); 2873 2874 RecordDecl *T; 2875 // FIXME: Needs the FlagAppleBlock bit. 2876 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 2877 &Idents.get("__block_descriptor")); 2878 T->startDefinition(); 2879 2880 QualType FieldTypes[] = { 2881 UnsignedLongTy, 2882 UnsignedLongTy, 2883 }; 2884 2885 const char *FieldNames[] = { 2886 "reserved", 2887 "Size" 2888 }; 2889 2890 for (size_t i = 0; i < 2; ++i) { 2891 FieldDecl *Field = FieldDecl::Create(*this, 2892 T, 2893 SourceLocation(), 2894 &Idents.get(FieldNames[i]), 2895 FieldTypes[i], /*TInfo=*/0, 2896 /*BitWidth=*/0, 2897 /*Mutable=*/false); 2898 Field->setAccess(AS_public); 2899 T->addDecl(Field); 2900 } 2901 2902 T->completeDefinition(); 2903 2904 BlockDescriptorType = T; 2905 2906 return getTagDeclType(BlockDescriptorType); 2907} 2908 2909void ASTContext::setBlockDescriptorType(QualType T) { 2910 const RecordType *Rec = T->getAs<RecordType>(); 2911 assert(Rec && "Invalid BlockDescriptorType"); 2912 BlockDescriptorType = Rec->getDecl(); 2913} 2914 2915QualType ASTContext::getBlockDescriptorExtendedType() { 2916 if (BlockDescriptorExtendedType) 2917 return getTagDeclType(BlockDescriptorExtendedType); 2918 2919 RecordDecl *T; 2920 // FIXME: Needs the FlagAppleBlock bit. 2921 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 2922 &Idents.get("__block_descriptor_withcopydispose")); 2923 T->startDefinition(); 2924 2925 QualType FieldTypes[] = { 2926 UnsignedLongTy, 2927 UnsignedLongTy, 2928 getPointerType(VoidPtrTy), 2929 getPointerType(VoidPtrTy) 2930 }; 2931 2932 const char *FieldNames[] = { 2933 "reserved", 2934 "Size", 2935 "CopyFuncPtr", 2936 "DestroyFuncPtr" 2937 }; 2938 2939 for (size_t i = 0; i < 4; ++i) { 2940 FieldDecl *Field = FieldDecl::Create(*this, 2941 T, 2942 SourceLocation(), 2943 &Idents.get(FieldNames[i]), 2944 FieldTypes[i], /*TInfo=*/0, 2945 /*BitWidth=*/0, 2946 /*Mutable=*/false); 2947 Field->setAccess(AS_public); 2948 T->addDecl(Field); 2949 } 2950 2951 T->completeDefinition(); 2952 2953 BlockDescriptorExtendedType = T; 2954 2955 return getTagDeclType(BlockDescriptorExtendedType); 2956} 2957 2958void ASTContext::setBlockDescriptorExtendedType(QualType T) { 2959 const RecordType *Rec = T->getAs<RecordType>(); 2960 assert(Rec && "Invalid BlockDescriptorType"); 2961 BlockDescriptorExtendedType = Rec->getDecl(); 2962} 2963 2964bool ASTContext::BlockRequiresCopying(QualType Ty) { 2965 if (Ty->isBlockPointerType()) 2966 return true; 2967 if (isObjCNSObjectType(Ty)) 2968 return true; 2969 if (Ty->isObjCObjectPointerType()) 2970 return true; 2971 return false; 2972} 2973 2974QualType ASTContext::BuildByRefType(const char *DeclName, QualType Ty) { 2975 // type = struct __Block_byref_1_X { 2976 // void *__isa; 2977 // struct __Block_byref_1_X *__forwarding; 2978 // unsigned int __flags; 2979 // unsigned int __size; 2980 // void *__copy_helper; // as needed 2981 // void *__destroy_help // as needed 2982 // int X; 2983 // } * 2984 2985 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 2986 2987 // FIXME: Move up 2988 static unsigned int UniqueBlockByRefTypeID = 0; 2989 llvm::SmallString<36> Name; 2990 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 2991 ++UniqueBlockByRefTypeID << '_' << DeclName; 2992 RecordDecl *T; 2993 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 2994 &Idents.get(Name.str())); 2995 T->startDefinition(); 2996 QualType Int32Ty = IntTy; 2997 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 2998 QualType FieldTypes[] = { 2999 getPointerType(VoidPtrTy), 3000 getPointerType(getTagDeclType(T)), 3001 Int32Ty, 3002 Int32Ty, 3003 getPointerType(VoidPtrTy), 3004 getPointerType(VoidPtrTy), 3005 Ty 3006 }; 3007 3008 const char *FieldNames[] = { 3009 "__isa", 3010 "__forwarding", 3011 "__flags", 3012 "__size", 3013 "__copy_helper", 3014 "__destroy_helper", 3015 DeclName, 3016 }; 3017 3018 for (size_t i = 0; i < 7; ++i) { 3019 if (!HasCopyAndDispose && i >=4 && i <= 5) 3020 continue; 3021 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3022 &Idents.get(FieldNames[i]), 3023 FieldTypes[i], /*TInfo=*/0, 3024 /*BitWidth=*/0, /*Mutable=*/false); 3025 Field->setAccess(AS_public); 3026 T->addDecl(Field); 3027 } 3028 3029 T->completeDefinition(); 3030 3031 return getPointerType(getTagDeclType(T)); 3032} 3033 3034 3035QualType ASTContext::getBlockParmType( 3036 bool BlockHasCopyDispose, 3037 llvm::SmallVectorImpl<const Expr *> &Layout) { 3038 3039 // FIXME: Move up 3040 static unsigned int UniqueBlockParmTypeID = 0; 3041 llvm::SmallString<36> Name; 3042 llvm::raw_svector_ostream(Name) << "__block_literal_" 3043 << ++UniqueBlockParmTypeID; 3044 RecordDecl *T; 3045 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3046 &Idents.get(Name.str())); 3047 T->startDefinition(); 3048 QualType FieldTypes[] = { 3049 getPointerType(VoidPtrTy), 3050 IntTy, 3051 IntTy, 3052 getPointerType(VoidPtrTy), 3053 (BlockHasCopyDispose ? 3054 getPointerType(getBlockDescriptorExtendedType()) : 3055 getPointerType(getBlockDescriptorType())) 3056 }; 3057 3058 const char *FieldNames[] = { 3059 "__isa", 3060 "__flags", 3061 "__reserved", 3062 "__FuncPtr", 3063 "__descriptor" 3064 }; 3065 3066 for (size_t i = 0; i < 5; ++i) { 3067 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3068 &Idents.get(FieldNames[i]), 3069 FieldTypes[i], /*TInfo=*/0, 3070 /*BitWidth=*/0, /*Mutable=*/false); 3071 Field->setAccess(AS_public); 3072 T->addDecl(Field); 3073 } 3074 3075 for (unsigned i = 0; i < Layout.size(); ++i) { 3076 const Expr *E = Layout[i]; 3077 3078 QualType FieldType = E->getType(); 3079 IdentifierInfo *FieldName = 0; 3080 if (isa<CXXThisExpr>(E)) { 3081 FieldName = &Idents.get("this"); 3082 } else if (const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E)) { 3083 const ValueDecl *D = BDRE->getDecl(); 3084 FieldName = D->getIdentifier(); 3085 if (BDRE->isByRef()) 3086 FieldType = BuildByRefType(D->getNameAsCString(), FieldType); 3087 } else { 3088 // Padding. 3089 assert(isa<ConstantArrayType>(FieldType) && 3090 isa<DeclRefExpr>(E) && 3091 !cast<DeclRefExpr>(E)->getDecl()->getDeclName() && 3092 "doesn't match characteristics of padding decl"); 3093 } 3094 3095 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3096 FieldName, FieldType, /*TInfo=*/0, 3097 /*BitWidth=*/0, /*Mutable=*/false); 3098 Field->setAccess(AS_public); 3099 T->addDecl(Field); 3100 } 3101 3102 T->completeDefinition(); 3103 3104 return getPointerType(getTagDeclType(T)); 3105} 3106 3107void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3108 const RecordType *Rec = T->getAs<RecordType>(); 3109 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3110 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3111} 3112 3113// This returns true if a type has been typedefed to BOOL: 3114// typedef <type> BOOL; 3115static bool isTypeTypedefedAsBOOL(QualType T) { 3116 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3117 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3118 return II->isStr("BOOL"); 3119 3120 return false; 3121} 3122 3123/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3124/// purpose. 3125CharUnits ASTContext::getObjCEncodingTypeSize(QualType type) { 3126 CharUnits sz = getTypeSizeInChars(type); 3127 3128 // Make all integer and enum types at least as large as an int 3129 if (sz.isPositive() && type->isIntegralType()) 3130 sz = std::max(sz, getTypeSizeInChars(IntTy)); 3131 // Treat arrays as pointers, since that's how they're passed in. 3132 else if (type->isArrayType()) 3133 sz = getTypeSizeInChars(VoidPtrTy); 3134 return sz; 3135} 3136 3137static inline 3138std::string charUnitsToString(const CharUnits &CU) { 3139 return llvm::itostr(CU.getQuantity()); 3140} 3141 3142/// getObjCEncodingForBlockDecl - Return the encoded type for this block 3143/// declaration. 3144void ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr, 3145 std::string& S) { 3146 const BlockDecl *Decl = Expr->getBlockDecl(); 3147 QualType BlockTy = 3148 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3149 // Encode result type. 3150 getObjCEncodingForType(cast<FunctionType>(BlockTy)->getResultType(), S); 3151 // Compute size of all parameters. 3152 // Start with computing size of a pointer in number of bytes. 3153 // FIXME: There might(should) be a better way of doing this computation! 3154 SourceLocation Loc; 3155 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3156 CharUnits ParmOffset = PtrSize; 3157 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), 3158 E = Decl->param_end(); PI != E; ++PI) { 3159 QualType PType = (*PI)->getType(); 3160 CharUnits sz = getObjCEncodingTypeSize(PType); 3161 assert (sz.isPositive() && "BlockExpr - Incomplete param type"); 3162 ParmOffset += sz; 3163 } 3164 // Size of the argument frame 3165 S += charUnitsToString(ParmOffset); 3166 // Block pointer and offset. 3167 S += "@?0"; 3168 ParmOffset = PtrSize; 3169 3170 // Argument types. 3171 ParmOffset = PtrSize; 3172 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3173 Decl->param_end(); PI != E; ++PI) { 3174 ParmVarDecl *PVDecl = *PI; 3175 QualType PType = PVDecl->getOriginalType(); 3176 if (const ArrayType *AT = 3177 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3178 // Use array's original type only if it has known number of 3179 // elements. 3180 if (!isa<ConstantArrayType>(AT)) 3181 PType = PVDecl->getType(); 3182 } else if (PType->isFunctionType()) 3183 PType = PVDecl->getType(); 3184 getObjCEncodingForType(PType, S); 3185 S += charUnitsToString(ParmOffset); 3186 ParmOffset += getObjCEncodingTypeSize(PType); 3187 } 3188} 3189 3190/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3191/// declaration. 3192void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3193 std::string& S) { 3194 // FIXME: This is not very efficient. 3195 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3196 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3197 // Encode result type. 3198 getObjCEncodingForType(Decl->getResultType(), S); 3199 // Compute size of all parameters. 3200 // Start with computing size of a pointer in number of bytes. 3201 // FIXME: There might(should) be a better way of doing this computation! 3202 SourceLocation Loc; 3203 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3204 // The first two arguments (self and _cmd) are pointers; account for 3205 // their size. 3206 CharUnits ParmOffset = 2 * PtrSize; 3207 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3208 E = Decl->sel_param_end(); PI != E; ++PI) { 3209 QualType PType = (*PI)->getType(); 3210 CharUnits sz = getObjCEncodingTypeSize(PType); 3211 assert (sz.isPositive() && 3212 "getObjCEncodingForMethodDecl - Incomplete param type"); 3213 ParmOffset += sz; 3214 } 3215 S += charUnitsToString(ParmOffset); 3216 S += "@0:"; 3217 S += charUnitsToString(PtrSize); 3218 3219 // Argument types. 3220 ParmOffset = 2 * PtrSize; 3221 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3222 E = Decl->sel_param_end(); PI != E; ++PI) { 3223 ParmVarDecl *PVDecl = *PI; 3224 QualType PType = PVDecl->getOriginalType(); 3225 if (const ArrayType *AT = 3226 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3227 // Use array's original type only if it has known number of 3228 // elements. 3229 if (!isa<ConstantArrayType>(AT)) 3230 PType = PVDecl->getType(); 3231 } else if (PType->isFunctionType()) 3232 PType = PVDecl->getType(); 3233 // Process argument qualifiers for user supplied arguments; such as, 3234 // 'in', 'inout', etc. 3235 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3236 getObjCEncodingForType(PType, S); 3237 S += charUnitsToString(ParmOffset); 3238 ParmOffset += getObjCEncodingTypeSize(PType); 3239 } 3240} 3241 3242/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3243/// property declaration. If non-NULL, Container must be either an 3244/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3245/// NULL when getting encodings for protocol properties. 3246/// Property attributes are stored as a comma-delimited C string. The simple 3247/// attributes readonly and bycopy are encoded as single characters. The 3248/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3249/// encoded as single characters, followed by an identifier. Property types 3250/// are also encoded as a parametrized attribute. The characters used to encode 3251/// these attributes are defined by the following enumeration: 3252/// @code 3253/// enum PropertyAttributes { 3254/// kPropertyReadOnly = 'R', // property is read-only. 3255/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3256/// kPropertyByref = '&', // property is a reference to the value last assigned 3257/// kPropertyDynamic = 'D', // property is dynamic 3258/// kPropertyGetter = 'G', // followed by getter selector name 3259/// kPropertySetter = 'S', // followed by setter selector name 3260/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3261/// kPropertyType = 't' // followed by old-style type encoding. 3262/// kPropertyWeak = 'W' // 'weak' property 3263/// kPropertyStrong = 'P' // property GC'able 3264/// kPropertyNonAtomic = 'N' // property non-atomic 3265/// }; 3266/// @endcode 3267void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3268 const Decl *Container, 3269 std::string& S) { 3270 // Collect information from the property implementation decl(s). 3271 bool Dynamic = false; 3272 ObjCPropertyImplDecl *SynthesizePID = 0; 3273 3274 // FIXME: Duplicated code due to poor abstraction. 3275 if (Container) { 3276 if (const ObjCCategoryImplDecl *CID = 3277 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3278 for (ObjCCategoryImplDecl::propimpl_iterator 3279 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3280 i != e; ++i) { 3281 ObjCPropertyImplDecl *PID = *i; 3282 if (PID->getPropertyDecl() == PD) { 3283 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3284 Dynamic = true; 3285 } else { 3286 SynthesizePID = PID; 3287 } 3288 } 3289 } 3290 } else { 3291 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3292 for (ObjCCategoryImplDecl::propimpl_iterator 3293 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3294 i != e; ++i) { 3295 ObjCPropertyImplDecl *PID = *i; 3296 if (PID->getPropertyDecl() == PD) { 3297 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3298 Dynamic = true; 3299 } else { 3300 SynthesizePID = PID; 3301 } 3302 } 3303 } 3304 } 3305 } 3306 3307 // FIXME: This is not very efficient. 3308 S = "T"; 3309 3310 // Encode result type. 3311 // GCC has some special rules regarding encoding of properties which 3312 // closely resembles encoding of ivars. 3313 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3314 true /* outermost type */, 3315 true /* encoding for property */); 3316 3317 if (PD->isReadOnly()) { 3318 S += ",R"; 3319 } else { 3320 switch (PD->getSetterKind()) { 3321 case ObjCPropertyDecl::Assign: break; 3322 case ObjCPropertyDecl::Copy: S += ",C"; break; 3323 case ObjCPropertyDecl::Retain: S += ",&"; break; 3324 } 3325 } 3326 3327 // It really isn't clear at all what this means, since properties 3328 // are "dynamic by default". 3329 if (Dynamic) 3330 S += ",D"; 3331 3332 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3333 S += ",N"; 3334 3335 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3336 S += ",G"; 3337 S += PD->getGetterName().getAsString(); 3338 } 3339 3340 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3341 S += ",S"; 3342 S += PD->getSetterName().getAsString(); 3343 } 3344 3345 if (SynthesizePID) { 3346 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3347 S += ",V"; 3348 S += OID->getNameAsString(); 3349 } 3350 3351 // FIXME: OBJCGC: weak & strong 3352} 3353 3354/// getLegacyIntegralTypeEncoding - 3355/// Another legacy compatibility encoding: 32-bit longs are encoded as 3356/// 'l' or 'L' , but not always. For typedefs, we need to use 3357/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3358/// 3359void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3360 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3361 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3362 if (BT->getKind() == BuiltinType::ULong && 3363 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3364 PointeeTy = UnsignedIntTy; 3365 else 3366 if (BT->getKind() == BuiltinType::Long && 3367 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3368 PointeeTy = IntTy; 3369 } 3370 } 3371} 3372 3373void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3374 const FieldDecl *Field) { 3375 // We follow the behavior of gcc, expanding structures which are 3376 // directly pointed to, and expanding embedded structures. Note that 3377 // these rules are sufficient to prevent recursive encoding of the 3378 // same type. 3379 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3380 true /* outermost type */); 3381} 3382 3383static void EncodeBitField(const ASTContext *Context, std::string& S, 3384 const FieldDecl *FD) { 3385 const Expr *E = FD->getBitWidth(); 3386 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3387 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3388 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3389 S += 'b'; 3390 S += llvm::utostr(N); 3391} 3392 3393// FIXME: Use SmallString for accumulating string. 3394void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3395 bool ExpandPointedToStructures, 3396 bool ExpandStructures, 3397 const FieldDecl *FD, 3398 bool OutermostType, 3399 bool EncodingProperty) { 3400 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3401 if (FD && FD->isBitField()) 3402 return EncodeBitField(this, S, FD); 3403 char encoding; 3404 switch (BT->getKind()) { 3405 default: assert(0 && "Unhandled builtin type kind"); 3406 case BuiltinType::Void: encoding = 'v'; break; 3407 case BuiltinType::Bool: encoding = 'B'; break; 3408 case BuiltinType::Char_U: 3409 case BuiltinType::UChar: encoding = 'C'; break; 3410 case BuiltinType::UShort: encoding = 'S'; break; 3411 case BuiltinType::UInt: encoding = 'I'; break; 3412 case BuiltinType::ULong: 3413 encoding = 3414 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3415 break; 3416 case BuiltinType::UInt128: encoding = 'T'; break; 3417 case BuiltinType::ULongLong: encoding = 'Q'; break; 3418 case BuiltinType::Char_S: 3419 case BuiltinType::SChar: encoding = 'c'; break; 3420 case BuiltinType::Short: encoding = 's'; break; 3421 case BuiltinType::Int: encoding = 'i'; break; 3422 case BuiltinType::Long: 3423 encoding = 3424 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3425 break; 3426 case BuiltinType::LongLong: encoding = 'q'; break; 3427 case BuiltinType::Int128: encoding = 't'; break; 3428 case BuiltinType::Float: encoding = 'f'; break; 3429 case BuiltinType::Double: encoding = 'd'; break; 3430 case BuiltinType::LongDouble: encoding = 'd'; break; 3431 } 3432 3433 S += encoding; 3434 return; 3435 } 3436 3437 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3438 S += 'j'; 3439 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3440 false); 3441 return; 3442 } 3443 3444 // encoding for pointer or r3eference types. 3445 QualType PointeeTy; 3446 if (const PointerType *PT = T->getAs<PointerType>()) { 3447 if (PT->isObjCSelType()) { 3448 S += ':'; 3449 return; 3450 } 3451 PointeeTy = PT->getPointeeType(); 3452 } 3453 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 3454 PointeeTy = RT->getPointeeType(); 3455 if (!PointeeTy.isNull()) { 3456 bool isReadOnly = false; 3457 // For historical/compatibility reasons, the read-only qualifier of the 3458 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3459 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3460 // Also, do not emit the 'r' for anything but the outermost type! 3461 if (isa<TypedefType>(T.getTypePtr())) { 3462 if (OutermostType && T.isConstQualified()) { 3463 isReadOnly = true; 3464 S += 'r'; 3465 } 3466 } else if (OutermostType) { 3467 QualType P = PointeeTy; 3468 while (P->getAs<PointerType>()) 3469 P = P->getAs<PointerType>()->getPointeeType(); 3470 if (P.isConstQualified()) { 3471 isReadOnly = true; 3472 S += 'r'; 3473 } 3474 } 3475 if (isReadOnly) { 3476 // Another legacy compatibility encoding. Some ObjC qualifier and type 3477 // combinations need to be rearranged. 3478 // Rewrite "in const" from "nr" to "rn" 3479 if (llvm::StringRef(S).endswith("nr")) 3480 S.replace(S.end()-2, S.end(), "rn"); 3481 } 3482 3483 if (PointeeTy->isCharType()) { 3484 // char pointer types should be encoded as '*' unless it is a 3485 // type that has been typedef'd to 'BOOL'. 3486 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3487 S += '*'; 3488 return; 3489 } 3490 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3491 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3492 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3493 S += '#'; 3494 return; 3495 } 3496 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3497 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3498 S += '@'; 3499 return; 3500 } 3501 // fall through... 3502 } 3503 S += '^'; 3504 getLegacyIntegralTypeEncoding(PointeeTy); 3505 3506 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3507 NULL); 3508 return; 3509 } 3510 3511 if (const ArrayType *AT = 3512 // Ignore type qualifiers etc. 3513 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3514 if (isa<IncompleteArrayType>(AT)) { 3515 // Incomplete arrays are encoded as a pointer to the array element. 3516 S += '^'; 3517 3518 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3519 false, ExpandStructures, FD); 3520 } else { 3521 S += '['; 3522 3523 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3524 S += llvm::utostr(CAT->getSize().getZExtValue()); 3525 else { 3526 //Variable length arrays are encoded as a regular array with 0 elements. 3527 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3528 S += '0'; 3529 } 3530 3531 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3532 false, ExpandStructures, FD); 3533 S += ']'; 3534 } 3535 return; 3536 } 3537 3538 if (T->getAs<FunctionType>()) { 3539 S += '?'; 3540 return; 3541 } 3542 3543 if (const RecordType *RTy = T->getAs<RecordType>()) { 3544 RecordDecl *RDecl = RTy->getDecl(); 3545 S += RDecl->isUnion() ? '(' : '{'; 3546 // Anonymous structures print as '?' 3547 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3548 S += II->getName(); 3549 if (ClassTemplateSpecializationDecl *Spec 3550 = dyn_cast<ClassTemplateSpecializationDecl>(RDecl)) { 3551 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 3552 std::string TemplateArgsStr 3553 = TemplateSpecializationType::PrintTemplateArgumentList( 3554 TemplateArgs.getFlatArgumentList(), 3555 TemplateArgs.flat_size(), 3556 (*this).PrintingPolicy); 3557 3558 S += TemplateArgsStr; 3559 } 3560 } else { 3561 S += '?'; 3562 } 3563 if (ExpandStructures) { 3564 S += '='; 3565 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3566 FieldEnd = RDecl->field_end(); 3567 Field != FieldEnd; ++Field) { 3568 if (FD) { 3569 S += '"'; 3570 S += Field->getNameAsString(); 3571 S += '"'; 3572 } 3573 3574 // Special case bit-fields. 3575 if (Field->isBitField()) { 3576 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3577 (*Field)); 3578 } else { 3579 QualType qt = Field->getType(); 3580 getLegacyIntegralTypeEncoding(qt); 3581 getObjCEncodingForTypeImpl(qt, S, false, true, 3582 FD); 3583 } 3584 } 3585 } 3586 S += RDecl->isUnion() ? ')' : '}'; 3587 return; 3588 } 3589 3590 if (T->isEnumeralType()) { 3591 if (FD && FD->isBitField()) 3592 EncodeBitField(this, S, FD); 3593 else 3594 S += 'i'; 3595 return; 3596 } 3597 3598 if (T->isBlockPointerType()) { 3599 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3600 return; 3601 } 3602 3603 // Ignore protocol qualifiers when mangling at this level. 3604 if (const ObjCObjectType *OT = T->getAs<ObjCObjectType>()) 3605 T = OT->getBaseType(); 3606 3607 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3608 // @encode(class_name) 3609 ObjCInterfaceDecl *OI = OIT->getDecl(); 3610 S += '{'; 3611 const IdentifierInfo *II = OI->getIdentifier(); 3612 S += II->getName(); 3613 S += '='; 3614 llvm::SmallVector<FieldDecl*, 32> RecFields; 3615 CollectObjCIvars(OI, RecFields); 3616 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3617 if (RecFields[i]->isBitField()) 3618 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3619 RecFields[i]); 3620 else 3621 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3622 FD); 3623 } 3624 S += '}'; 3625 return; 3626 } 3627 3628 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3629 if (OPT->isObjCIdType()) { 3630 S += '@'; 3631 return; 3632 } 3633 3634 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 3635 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 3636 // Since this is a binary compatibility issue, need to consult with runtime 3637 // folks. Fortunately, this is a *very* obsure construct. 3638 S += '#'; 3639 return; 3640 } 3641 3642 if (OPT->isObjCQualifiedIdType()) { 3643 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3644 ExpandPointedToStructures, 3645 ExpandStructures, FD); 3646 if (FD || EncodingProperty) { 3647 // Note that we do extended encoding of protocol qualifer list 3648 // Only when doing ivar or property encoding. 3649 S += '"'; 3650 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3651 E = OPT->qual_end(); I != E; ++I) { 3652 S += '<'; 3653 S += (*I)->getNameAsString(); 3654 S += '>'; 3655 } 3656 S += '"'; 3657 } 3658 return; 3659 } 3660 3661 QualType PointeeTy = OPT->getPointeeType(); 3662 if (!EncodingProperty && 3663 isa<TypedefType>(PointeeTy.getTypePtr())) { 3664 // Another historical/compatibility reason. 3665 // We encode the underlying type which comes out as 3666 // {...}; 3667 S += '^'; 3668 getObjCEncodingForTypeImpl(PointeeTy, S, 3669 false, ExpandPointedToStructures, 3670 NULL); 3671 return; 3672 } 3673 3674 S += '@'; 3675 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 3676 S += '"'; 3677 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 3678 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3679 E = OPT->qual_end(); I != E; ++I) { 3680 S += '<'; 3681 S += (*I)->getNameAsString(); 3682 S += '>'; 3683 } 3684 S += '"'; 3685 } 3686 return; 3687 } 3688 3689 // gcc just blithely ignores member pointers. 3690 // TODO: maybe there should be a mangling for these 3691 if (T->getAs<MemberPointerType>()) 3692 return; 3693 3694 assert(0 && "@encode for type not implemented!"); 3695} 3696 3697void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3698 std::string& S) const { 3699 if (QT & Decl::OBJC_TQ_In) 3700 S += 'n'; 3701 if (QT & Decl::OBJC_TQ_Inout) 3702 S += 'N'; 3703 if (QT & Decl::OBJC_TQ_Out) 3704 S += 'o'; 3705 if (QT & Decl::OBJC_TQ_Bycopy) 3706 S += 'O'; 3707 if (QT & Decl::OBJC_TQ_Byref) 3708 S += 'R'; 3709 if (QT & Decl::OBJC_TQ_Oneway) 3710 S += 'V'; 3711} 3712 3713void ASTContext::setBuiltinVaListType(QualType T) { 3714 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3715 3716 BuiltinVaListType = T; 3717} 3718 3719void ASTContext::setObjCIdType(QualType T) { 3720 ObjCIdTypedefType = T; 3721} 3722 3723void ASTContext::setObjCSelType(QualType T) { 3724 ObjCSelTypedefType = T; 3725} 3726 3727void ASTContext::setObjCProtoType(QualType QT) { 3728 ObjCProtoType = QT; 3729} 3730 3731void ASTContext::setObjCClassType(QualType T) { 3732 ObjCClassTypedefType = T; 3733} 3734 3735void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3736 assert(ObjCConstantStringType.isNull() && 3737 "'NSConstantString' type already set!"); 3738 3739 ObjCConstantStringType = getObjCInterfaceType(Decl); 3740} 3741 3742/// \brief Retrieve the template name that corresponds to a non-empty 3743/// lookup. 3744TemplateName ASTContext::getOverloadedTemplateName(UnresolvedSetIterator Begin, 3745 UnresolvedSetIterator End) { 3746 unsigned size = End - Begin; 3747 assert(size > 1 && "set is not overloaded!"); 3748 3749 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 3750 size * sizeof(FunctionTemplateDecl*)); 3751 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 3752 3753 NamedDecl **Storage = OT->getStorage(); 3754 for (UnresolvedSetIterator I = Begin; I != End; ++I) { 3755 NamedDecl *D = *I; 3756 assert(isa<FunctionTemplateDecl>(D) || 3757 (isa<UsingShadowDecl>(D) && 3758 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 3759 *Storage++ = D; 3760 } 3761 3762 return TemplateName(OT); 3763} 3764 3765/// \brief Retrieve the template name that represents a qualified 3766/// template name such as \c std::vector. 3767TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3768 bool TemplateKeyword, 3769 TemplateDecl *Template) { 3770 // FIXME: Canonicalization? 3771 llvm::FoldingSetNodeID ID; 3772 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3773 3774 void *InsertPos = 0; 3775 QualifiedTemplateName *QTN = 3776 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3777 if (!QTN) { 3778 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3779 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3780 } 3781 3782 return TemplateName(QTN); 3783} 3784 3785/// \brief Retrieve the template name that represents a dependent 3786/// template name such as \c MetaFun::template apply. 3787TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3788 const IdentifierInfo *Name) { 3789 assert((!NNS || NNS->isDependent()) && 3790 "Nested name specifier must be dependent"); 3791 3792 llvm::FoldingSetNodeID ID; 3793 DependentTemplateName::Profile(ID, NNS, Name); 3794 3795 void *InsertPos = 0; 3796 DependentTemplateName *QTN = 3797 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3798 3799 if (QTN) 3800 return TemplateName(QTN); 3801 3802 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3803 if (CanonNNS == NNS) { 3804 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3805 } else { 3806 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3807 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3808 DependentTemplateName *CheckQTN = 3809 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3810 assert(!CheckQTN && "Dependent type name canonicalization broken"); 3811 (void)CheckQTN; 3812 } 3813 3814 DependentTemplateNames.InsertNode(QTN, InsertPos); 3815 return TemplateName(QTN); 3816} 3817 3818/// \brief Retrieve the template name that represents a dependent 3819/// template name such as \c MetaFun::template operator+. 3820TemplateName 3821ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3822 OverloadedOperatorKind Operator) { 3823 assert((!NNS || NNS->isDependent()) && 3824 "Nested name specifier must be dependent"); 3825 3826 llvm::FoldingSetNodeID ID; 3827 DependentTemplateName::Profile(ID, NNS, Operator); 3828 3829 void *InsertPos = 0; 3830 DependentTemplateName *QTN 3831 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3832 3833 if (QTN) 3834 return TemplateName(QTN); 3835 3836 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3837 if (CanonNNS == NNS) { 3838 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 3839 } else { 3840 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 3841 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 3842 3843 DependentTemplateName *CheckQTN 3844 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3845 assert(!CheckQTN && "Dependent template name canonicalization broken"); 3846 (void)CheckQTN; 3847 } 3848 3849 DependentTemplateNames.InsertNode(QTN, InsertPos); 3850 return TemplateName(QTN); 3851} 3852 3853/// getFromTargetType - Given one of the integer types provided by 3854/// TargetInfo, produce the corresponding type. The unsigned @p Type 3855/// is actually a value of type @c TargetInfo::IntType. 3856CanQualType ASTContext::getFromTargetType(unsigned Type) const { 3857 switch (Type) { 3858 case TargetInfo::NoInt: return CanQualType(); 3859 case TargetInfo::SignedShort: return ShortTy; 3860 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3861 case TargetInfo::SignedInt: return IntTy; 3862 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3863 case TargetInfo::SignedLong: return LongTy; 3864 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3865 case TargetInfo::SignedLongLong: return LongLongTy; 3866 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3867 } 3868 3869 assert(false && "Unhandled TargetInfo::IntType value"); 3870 return CanQualType(); 3871} 3872 3873//===----------------------------------------------------------------------===// 3874// Type Predicates. 3875//===----------------------------------------------------------------------===// 3876 3877/// isObjCNSObjectType - Return true if this is an NSObject object using 3878/// NSObject attribute on a c-style pointer type. 3879/// FIXME - Make it work directly on types. 3880/// FIXME: Move to Type. 3881/// 3882bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3883 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3884 if (TypedefDecl *TD = TDT->getDecl()) 3885 if (TD->getAttr<ObjCNSObjectAttr>()) 3886 return true; 3887 } 3888 return false; 3889} 3890 3891/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3892/// garbage collection attribute. 3893/// 3894Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3895 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3896 if (getLangOptions().ObjC1 && 3897 getLangOptions().getGCMode() != LangOptions::NonGC) { 3898 GCAttrs = Ty.getObjCGCAttr(); 3899 // Default behavious under objective-c's gc is for objective-c pointers 3900 // (or pointers to them) be treated as though they were declared 3901 // as __strong. 3902 if (GCAttrs == Qualifiers::GCNone) { 3903 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3904 GCAttrs = Qualifiers::Strong; 3905 else if (Ty->isPointerType()) 3906 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3907 } 3908 // Non-pointers have none gc'able attribute regardless of the attribute 3909 // set on them. 3910 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3911 return Qualifiers::GCNone; 3912 } 3913 return GCAttrs; 3914} 3915 3916//===----------------------------------------------------------------------===// 3917// Type Compatibility Testing 3918//===----------------------------------------------------------------------===// 3919 3920/// areCompatVectorTypes - Return true if the two specified vector types are 3921/// compatible. 3922static bool areCompatVectorTypes(const VectorType *LHS, 3923 const VectorType *RHS) { 3924 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 3925 return LHS->getElementType() == RHS->getElementType() && 3926 LHS->getNumElements() == RHS->getNumElements(); 3927} 3928 3929//===----------------------------------------------------------------------===// 3930// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3931//===----------------------------------------------------------------------===// 3932 3933/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3934/// inheritance hierarchy of 'rProto'. 3935bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3936 ObjCProtocolDecl *rProto) { 3937 if (lProto == rProto) 3938 return true; 3939 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3940 E = rProto->protocol_end(); PI != E; ++PI) 3941 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3942 return true; 3943 return false; 3944} 3945 3946/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3947/// return true if lhs's protocols conform to rhs's protocol; false 3948/// otherwise. 3949bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3950 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3951 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3952 return false; 3953} 3954 3955/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3956/// ObjCQualifiedIDType. 3957bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3958 bool compare) { 3959 // Allow id<P..> and an 'id' or void* type in all cases. 3960 if (lhs->isVoidPointerType() || 3961 lhs->isObjCIdType() || lhs->isObjCClassType()) 3962 return true; 3963 else if (rhs->isVoidPointerType() || 3964 rhs->isObjCIdType() || rhs->isObjCClassType()) 3965 return true; 3966 3967 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3968 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3969 3970 if (!rhsOPT) return false; 3971 3972 if (rhsOPT->qual_empty()) { 3973 // If the RHS is a unqualified interface pointer "NSString*", 3974 // make sure we check the class hierarchy. 3975 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3976 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3977 E = lhsQID->qual_end(); I != E; ++I) { 3978 // when comparing an id<P> on lhs with a static type on rhs, 3979 // see if static class implements all of id's protocols, directly or 3980 // through its super class and categories. 3981 if (!rhsID->ClassImplementsProtocol(*I, true)) 3982 return false; 3983 } 3984 } 3985 // If there are no qualifiers and no interface, we have an 'id'. 3986 return true; 3987 } 3988 // Both the right and left sides have qualifiers. 3989 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3990 E = lhsQID->qual_end(); I != E; ++I) { 3991 ObjCProtocolDecl *lhsProto = *I; 3992 bool match = false; 3993 3994 // when comparing an id<P> on lhs with a static type on rhs, 3995 // see if static class implements all of id's protocols, directly or 3996 // through its super class and categories. 3997 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3998 E = rhsOPT->qual_end(); J != E; ++J) { 3999 ObjCProtocolDecl *rhsProto = *J; 4000 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4001 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4002 match = true; 4003 break; 4004 } 4005 } 4006 // If the RHS is a qualified interface pointer "NSString<P>*", 4007 // make sure we check the class hierarchy. 4008 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4009 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4010 E = lhsQID->qual_end(); I != E; ++I) { 4011 // when comparing an id<P> on lhs with a static type on rhs, 4012 // see if static class implements all of id's protocols, directly or 4013 // through its super class and categories. 4014 if (rhsID->ClassImplementsProtocol(*I, true)) { 4015 match = true; 4016 break; 4017 } 4018 } 4019 } 4020 if (!match) 4021 return false; 4022 } 4023 4024 return true; 4025 } 4026 4027 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 4028 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 4029 4030 if (const ObjCObjectPointerType *lhsOPT = 4031 lhs->getAsObjCInterfacePointerType()) { 4032 if (lhsOPT->qual_empty()) { 4033 bool match = false; 4034 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 4035 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 4036 E = rhsQID->qual_end(); I != E; ++I) { 4037 // when comparing an id<P> on lhs with a static type on rhs, 4038 // see if static class implements all of id's protocols, directly or 4039 // through its super class and categories. 4040 if (lhsID->ClassImplementsProtocol(*I, true)) { 4041 match = true; 4042 break; 4043 } 4044 } 4045 if (!match) 4046 return false; 4047 } 4048 return true; 4049 } 4050 // Both the right and left sides have qualifiers. 4051 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 4052 E = lhsOPT->qual_end(); I != E; ++I) { 4053 ObjCProtocolDecl *lhsProto = *I; 4054 bool match = false; 4055 4056 // when comparing an id<P> on lhs with a static type on rhs, 4057 // see if static class implements all of id's protocols, directly or 4058 // through its super class and categories. 4059 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4060 E = rhsQID->qual_end(); J != E; ++J) { 4061 ObjCProtocolDecl *rhsProto = *J; 4062 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4063 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4064 match = true; 4065 break; 4066 } 4067 } 4068 if (!match) 4069 return false; 4070 } 4071 return true; 4072 } 4073 return false; 4074} 4075 4076/// canAssignObjCInterfaces - Return true if the two interface types are 4077/// compatible for assignment from RHS to LHS. This handles validation of any 4078/// protocol qualifiers on the LHS or RHS. 4079/// 4080bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4081 const ObjCObjectPointerType *RHSOPT) { 4082 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4083 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4084 4085 // If either type represents the built-in 'id' or 'Class' types, return true. 4086 if (LHS->isObjCUnqualifiedIdOrClass() || 4087 RHS->isObjCUnqualifiedIdOrClass()) 4088 return true; 4089 4090 if (LHS->isObjCQualifiedId() || RHS->isObjCQualifiedId()) 4091 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4092 QualType(RHSOPT,0), 4093 false); 4094 4095 // If we have 2 user-defined types, fall into that path. 4096 if (LHS->getInterface() && RHS->getInterface()) 4097 return canAssignObjCInterfaces(LHS, RHS); 4098 4099 return false; 4100} 4101 4102/// canAssignObjCInterfacesInBlockPointer - This routine is specifically written 4103/// for providing type-safty for objective-c pointers used to pass/return 4104/// arguments in block literals. When passed as arguments, passing 'A*' where 4105/// 'id' is expected is not OK. Passing 'Sub *" where 'Super *" is expected is 4106/// not OK. For the return type, the opposite is not OK. 4107bool ASTContext::canAssignObjCInterfacesInBlockPointer( 4108 const ObjCObjectPointerType *LHSOPT, 4109 const ObjCObjectPointerType *RHSOPT) { 4110 if (RHSOPT->isObjCBuiltinType() || LHSOPT->isObjCIdType()) 4111 return true; 4112 4113 if (LHSOPT->isObjCBuiltinType()) { 4114 return RHSOPT->isObjCBuiltinType() || RHSOPT->isObjCQualifiedIdType(); 4115 } 4116 4117 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4118 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4119 QualType(RHSOPT,0), 4120 false); 4121 4122 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4123 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4124 if (LHS && RHS) { // We have 2 user-defined types. 4125 if (LHS != RHS) { 4126 if (LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4127 return false; 4128 if (RHS->getDecl()->isSuperClassOf(LHS->getDecl())) 4129 return true; 4130 } 4131 else 4132 return true; 4133 } 4134 return false; 4135} 4136 4137/// getIntersectionOfProtocols - This routine finds the intersection of set 4138/// of protocols inherited from two distinct objective-c pointer objects. 4139/// It is used to build composite qualifier list of the composite type of 4140/// the conditional expression involving two objective-c pointer objects. 4141static 4142void getIntersectionOfProtocols(ASTContext &Context, 4143 const ObjCObjectPointerType *LHSOPT, 4144 const ObjCObjectPointerType *RHSOPT, 4145 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4146 4147 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4148 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4149 assert(LHS->getInterface() && "LHS must have an interface base"); 4150 assert(RHS->getInterface() && "RHS must have an interface base"); 4151 4152 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4153 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4154 if (LHSNumProtocols > 0) 4155 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4156 else { 4157 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4158 Context.CollectInheritedProtocols(LHS->getInterface(), 4159 LHSInheritedProtocols); 4160 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4161 LHSInheritedProtocols.end()); 4162 } 4163 4164 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4165 if (RHSNumProtocols > 0) { 4166 ObjCProtocolDecl **RHSProtocols = 4167 const_cast<ObjCProtocolDecl **>(RHS->qual_begin()); 4168 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4169 if (InheritedProtocolSet.count(RHSProtocols[i])) 4170 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4171 } 4172 else { 4173 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4174 Context.CollectInheritedProtocols(RHS->getInterface(), 4175 RHSInheritedProtocols); 4176 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4177 RHSInheritedProtocols.begin(), 4178 E = RHSInheritedProtocols.end(); I != E; ++I) 4179 if (InheritedProtocolSet.count((*I))) 4180 IntersectionOfProtocols.push_back((*I)); 4181 } 4182} 4183 4184/// areCommonBaseCompatible - Returns common base class of the two classes if 4185/// one found. Note that this is O'2 algorithm. But it will be called as the 4186/// last type comparison in a ?-exp of ObjC pointer types before a 4187/// warning is issued. So, its invokation is extremely rare. 4188QualType ASTContext::areCommonBaseCompatible( 4189 const ObjCObjectPointerType *Lptr, 4190 const ObjCObjectPointerType *Rptr) { 4191 const ObjCObjectType *LHS = Lptr->getObjectType(); 4192 const ObjCObjectType *RHS = Rptr->getObjectType(); 4193 const ObjCInterfaceDecl* LDecl = LHS->getInterface(); 4194 const ObjCInterfaceDecl* RDecl = RHS->getInterface(); 4195 if (!LDecl || !RDecl) 4196 return QualType(); 4197 4198 while ((LDecl = LDecl->getSuperClass())) { 4199 LHS = cast<ObjCInterfaceType>(getObjCInterfaceType(LDecl)); 4200 if (canAssignObjCInterfaces(LHS, RHS)) { 4201 llvm::SmallVector<ObjCProtocolDecl *, 8> Protocols; 4202 getIntersectionOfProtocols(*this, Lptr, Rptr, Protocols); 4203 4204 QualType Result = QualType(LHS, 0); 4205 if (!Protocols.empty()) 4206 Result = getObjCObjectType(Result, Protocols.data(), Protocols.size()); 4207 Result = getObjCObjectPointerType(Result); 4208 return Result; 4209 } 4210 } 4211 4212 return QualType(); 4213} 4214 4215bool ASTContext::canAssignObjCInterfaces(const ObjCObjectType *LHS, 4216 const ObjCObjectType *RHS) { 4217 assert(LHS->getInterface() && "LHS is not an interface type"); 4218 assert(RHS->getInterface() && "RHS is not an interface type"); 4219 4220 // Verify that the base decls are compatible: the RHS must be a subclass of 4221 // the LHS. 4222 if (!LHS->getInterface()->isSuperClassOf(RHS->getInterface())) 4223 return false; 4224 4225 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4226 // protocol qualified at all, then we are good. 4227 if (LHS->getNumProtocols() == 0) 4228 return true; 4229 4230 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4231 // isn't a superset. 4232 if (RHS->getNumProtocols() == 0) 4233 return true; // FIXME: should return false! 4234 4235 for (ObjCObjectType::qual_iterator LHSPI = LHS->qual_begin(), 4236 LHSPE = LHS->qual_end(); 4237 LHSPI != LHSPE; LHSPI++) { 4238 bool RHSImplementsProtocol = false; 4239 4240 // If the RHS doesn't implement the protocol on the left, the types 4241 // are incompatible. 4242 for (ObjCObjectType::qual_iterator RHSPI = RHS->qual_begin(), 4243 RHSPE = RHS->qual_end(); 4244 RHSPI != RHSPE; RHSPI++) { 4245 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4246 RHSImplementsProtocol = true; 4247 break; 4248 } 4249 } 4250 // FIXME: For better diagnostics, consider passing back the protocol name. 4251 if (!RHSImplementsProtocol) 4252 return false; 4253 } 4254 // The RHS implements all protocols listed on the LHS. 4255 return true; 4256} 4257 4258bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4259 // get the "pointed to" types 4260 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4261 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4262 4263 if (!LHSOPT || !RHSOPT) 4264 return false; 4265 4266 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4267 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4268} 4269 4270/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4271/// both shall have the identically qualified version of a compatible type. 4272/// C99 6.2.7p1: Two types have compatible types if their types are the 4273/// same. See 6.7.[2,3,5] for additional rules. 4274bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 4275 if (getLangOptions().CPlusPlus) 4276 return hasSameType(LHS, RHS); 4277 4278 return !mergeTypes(LHS, RHS).isNull(); 4279} 4280 4281bool ASTContext::typesAreBlockPointerCompatible(QualType LHS, QualType RHS) { 4282 return !mergeTypes(LHS, RHS, true).isNull(); 4283} 4284 4285QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs, 4286 bool OfBlockPointer) { 4287 const FunctionType *lbase = lhs->getAs<FunctionType>(); 4288 const FunctionType *rbase = rhs->getAs<FunctionType>(); 4289 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 4290 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 4291 bool allLTypes = true; 4292 bool allRTypes = true; 4293 4294 // Check return type 4295 QualType retType; 4296 if (OfBlockPointer) 4297 retType = mergeTypes(rbase->getResultType(), lbase->getResultType(), true); 4298 else 4299 retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 4300 if (retType.isNull()) return QualType(); 4301 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 4302 allLTypes = false; 4303 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 4304 allRTypes = false; 4305 // FIXME: double check this 4306 // FIXME: should we error if lbase->getRegParmAttr() != 0 && 4307 // rbase->getRegParmAttr() != 0 && 4308 // lbase->getRegParmAttr() != rbase->getRegParmAttr()? 4309 FunctionType::ExtInfo lbaseInfo = lbase->getExtInfo(); 4310 FunctionType::ExtInfo rbaseInfo = rbase->getExtInfo(); 4311 unsigned RegParm = lbaseInfo.getRegParm() == 0 ? rbaseInfo.getRegParm() : 4312 lbaseInfo.getRegParm(); 4313 bool NoReturn = lbaseInfo.getNoReturn() || rbaseInfo.getNoReturn(); 4314 if (NoReturn != lbaseInfo.getNoReturn() || 4315 RegParm != lbaseInfo.getRegParm()) 4316 allLTypes = false; 4317 if (NoReturn != rbaseInfo.getNoReturn() || 4318 RegParm != rbaseInfo.getRegParm()) 4319 allRTypes = false; 4320 CallingConv lcc = lbaseInfo.getCC(); 4321 CallingConv rcc = rbaseInfo.getCC(); 4322 // Compatible functions must have compatible calling conventions 4323 if (!isSameCallConv(lcc, rcc)) 4324 return QualType(); 4325 4326 if (lproto && rproto) { // two C99 style function prototypes 4327 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 4328 "C++ shouldn't be here"); 4329 unsigned lproto_nargs = lproto->getNumArgs(); 4330 unsigned rproto_nargs = rproto->getNumArgs(); 4331 4332 // Compatible functions must have the same number of arguments 4333 if (lproto_nargs != rproto_nargs) 4334 return QualType(); 4335 4336 // Variadic and non-variadic functions aren't compatible 4337 if (lproto->isVariadic() != rproto->isVariadic()) 4338 return QualType(); 4339 4340 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 4341 return QualType(); 4342 4343 // Check argument compatibility 4344 llvm::SmallVector<QualType, 10> types; 4345 for (unsigned i = 0; i < lproto_nargs; i++) { 4346 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 4347 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 4348 QualType argtype = mergeTypes(largtype, rargtype, OfBlockPointer); 4349 if (argtype.isNull()) return QualType(); 4350 types.push_back(argtype); 4351 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 4352 allLTypes = false; 4353 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 4354 allRTypes = false; 4355 } 4356 if (allLTypes) return lhs; 4357 if (allRTypes) return rhs; 4358 return getFunctionType(retType, types.begin(), types.size(), 4359 lproto->isVariadic(), lproto->getTypeQuals(), 4360 false, false, 0, 0, 4361 FunctionType::ExtInfo(NoReturn, RegParm, lcc)); 4362 } 4363 4364 if (lproto) allRTypes = false; 4365 if (rproto) allLTypes = false; 4366 4367 const FunctionProtoType *proto = lproto ? lproto : rproto; 4368 if (proto) { 4369 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 4370 if (proto->isVariadic()) return QualType(); 4371 // Check that the types are compatible with the types that 4372 // would result from default argument promotions (C99 6.7.5.3p15). 4373 // The only types actually affected are promotable integer 4374 // types and floats, which would be passed as a different 4375 // type depending on whether the prototype is visible. 4376 unsigned proto_nargs = proto->getNumArgs(); 4377 for (unsigned i = 0; i < proto_nargs; ++i) { 4378 QualType argTy = proto->getArgType(i); 4379 4380 // Look at the promotion type of enum types, since that is the type used 4381 // to pass enum values. 4382 if (const EnumType *Enum = argTy->getAs<EnumType>()) 4383 argTy = Enum->getDecl()->getPromotionType(); 4384 4385 if (argTy->isPromotableIntegerType() || 4386 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 4387 return QualType(); 4388 } 4389 4390 if (allLTypes) return lhs; 4391 if (allRTypes) return rhs; 4392 return getFunctionType(retType, proto->arg_type_begin(), 4393 proto->getNumArgs(), proto->isVariadic(), 4394 proto->getTypeQuals(), 4395 false, false, 0, 0, 4396 FunctionType::ExtInfo(NoReturn, RegParm, lcc)); 4397 } 4398 4399 if (allLTypes) return lhs; 4400 if (allRTypes) return rhs; 4401 FunctionType::ExtInfo Info(NoReturn, RegParm, lcc); 4402 return getFunctionNoProtoType(retType, Info); 4403} 4404 4405QualType ASTContext::mergeTypes(QualType LHS, QualType RHS, 4406 bool OfBlockPointer) { 4407 // C++ [expr]: If an expression initially has the type "reference to T", the 4408 // type is adjusted to "T" prior to any further analysis, the expression 4409 // designates the object or function denoted by the reference, and the 4410 // expression is an lvalue unless the reference is an rvalue reference and 4411 // the expression is a function call (possibly inside parentheses). 4412 assert(!LHS->getAs<ReferenceType>() && "LHS is a reference type?"); 4413 assert(!RHS->getAs<ReferenceType>() && "RHS is a reference type?"); 4414 4415 QualType LHSCan = getCanonicalType(LHS), 4416 RHSCan = getCanonicalType(RHS); 4417 4418 // If two types are identical, they are compatible. 4419 if (LHSCan == RHSCan) 4420 return LHS; 4421 4422 // If the qualifiers are different, the types aren't compatible... mostly. 4423 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 4424 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 4425 if (LQuals != RQuals) { 4426 // If any of these qualifiers are different, we have a type 4427 // mismatch. 4428 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 4429 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 4430 return QualType(); 4431 4432 // Exactly one GC qualifier difference is allowed: __strong is 4433 // okay if the other type has no GC qualifier but is an Objective 4434 // C object pointer (i.e. implicitly strong by default). We fix 4435 // this by pretending that the unqualified type was actually 4436 // qualified __strong. 4437 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 4438 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 4439 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 4440 4441 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 4442 return QualType(); 4443 4444 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 4445 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 4446 } 4447 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 4448 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 4449 } 4450 return QualType(); 4451 } 4452 4453 // Okay, qualifiers are equal. 4454 4455 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 4456 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 4457 4458 // We want to consider the two function types to be the same for these 4459 // comparisons, just force one to the other. 4460 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 4461 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 4462 4463 // Same as above for arrays 4464 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 4465 LHSClass = Type::ConstantArray; 4466 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 4467 RHSClass = Type::ConstantArray; 4468 4469 // ObjCInterfaces are just specialized ObjCObjects. 4470 if (LHSClass == Type::ObjCInterface) LHSClass = Type::ObjCObject; 4471 if (RHSClass == Type::ObjCInterface) RHSClass = Type::ObjCObject; 4472 4473 // Canonicalize ExtVector -> Vector. 4474 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 4475 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 4476 4477 // If the canonical type classes don't match. 4478 if (LHSClass != RHSClass) { 4479 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 4480 // a signed integer type, or an unsigned integer type. 4481 // Compatibility is based on the underlying type, not the promotion 4482 // type. 4483 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 4484 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 4485 return RHS; 4486 } 4487 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 4488 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 4489 return LHS; 4490 } 4491 4492 return QualType(); 4493 } 4494 4495 // The canonical type classes match. 4496 switch (LHSClass) { 4497#define TYPE(Class, Base) 4498#define ABSTRACT_TYPE(Class, Base) 4499#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: 4500#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4501#define DEPENDENT_TYPE(Class, Base) case Type::Class: 4502#include "clang/AST/TypeNodes.def" 4503 assert(false && "Non-canonical and dependent types shouldn't get here"); 4504 return QualType(); 4505 4506 case Type::LValueReference: 4507 case Type::RValueReference: 4508 case Type::MemberPointer: 4509 assert(false && "C++ should never be in mergeTypes"); 4510 return QualType(); 4511 4512 case Type::ObjCInterface: 4513 case Type::IncompleteArray: 4514 case Type::VariableArray: 4515 case Type::FunctionProto: 4516 case Type::ExtVector: 4517 assert(false && "Types are eliminated above"); 4518 return QualType(); 4519 4520 case Type::Pointer: 4521 { 4522 // Merge two pointer types, while trying to preserve typedef info 4523 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 4524 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 4525 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4526 if (ResultType.isNull()) return QualType(); 4527 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4528 return LHS; 4529 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4530 return RHS; 4531 return getPointerType(ResultType); 4532 } 4533 case Type::BlockPointer: 4534 { 4535 // Merge two block pointer types, while trying to preserve typedef info 4536 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 4537 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 4538 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, OfBlockPointer); 4539 if (ResultType.isNull()) return QualType(); 4540 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4541 return LHS; 4542 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4543 return RHS; 4544 return getBlockPointerType(ResultType); 4545 } 4546 case Type::ConstantArray: 4547 { 4548 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 4549 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 4550 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 4551 return QualType(); 4552 4553 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 4554 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 4555 QualType ResultType = mergeTypes(LHSElem, RHSElem); 4556 if (ResultType.isNull()) return QualType(); 4557 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4558 return LHS; 4559 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4560 return RHS; 4561 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 4562 ArrayType::ArraySizeModifier(), 0); 4563 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 4564 ArrayType::ArraySizeModifier(), 0); 4565 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 4566 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 4567 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4568 return LHS; 4569 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4570 return RHS; 4571 if (LVAT) { 4572 // FIXME: This isn't correct! But tricky to implement because 4573 // the array's size has to be the size of LHS, but the type 4574 // has to be different. 4575 return LHS; 4576 } 4577 if (RVAT) { 4578 // FIXME: This isn't correct! But tricky to implement because 4579 // the array's size has to be the size of RHS, but the type 4580 // has to be different. 4581 return RHS; 4582 } 4583 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4584 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4585 return getIncompleteArrayType(ResultType, 4586 ArrayType::ArraySizeModifier(), 0); 4587 } 4588 case Type::FunctionNoProto: 4589 return mergeFunctionTypes(LHS, RHS, OfBlockPointer); 4590 case Type::Record: 4591 case Type::Enum: 4592 return QualType(); 4593 case Type::Builtin: 4594 // Only exactly equal builtin types are compatible, which is tested above. 4595 return QualType(); 4596 case Type::Complex: 4597 // Distinct complex types are incompatible. 4598 return QualType(); 4599 case Type::Vector: 4600 // FIXME: The merged type should be an ExtVector! 4601 if (areCompatVectorTypes(LHSCan->getAs<VectorType>(), 4602 RHSCan->getAs<VectorType>())) 4603 return LHS; 4604 return QualType(); 4605 case Type::ObjCObject: { 4606 // Check if the types are assignment compatible. 4607 // FIXME: This should be type compatibility, e.g. whether 4608 // "LHS x; RHS x;" at global scope is legal. 4609 const ObjCObjectType* LHSIface = LHS->getAs<ObjCObjectType>(); 4610 const ObjCObjectType* RHSIface = RHS->getAs<ObjCObjectType>(); 4611 if (canAssignObjCInterfaces(LHSIface, RHSIface)) 4612 return LHS; 4613 4614 return QualType(); 4615 } 4616 case Type::ObjCObjectPointer: { 4617 if (OfBlockPointer) { 4618 if (canAssignObjCInterfacesInBlockPointer( 4619 LHS->getAs<ObjCObjectPointerType>(), 4620 RHS->getAs<ObjCObjectPointerType>())) 4621 return LHS; 4622 return QualType(); 4623 } 4624 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4625 RHS->getAs<ObjCObjectPointerType>())) 4626 return LHS; 4627 4628 return QualType(); 4629 } 4630 } 4631 4632 return QualType(); 4633} 4634 4635/// mergeObjCGCQualifiers - This routine merges ObjC's GC attribute of 'LHS' and 4636/// 'RHS' attributes and returns the merged version; including for function 4637/// return types. 4638QualType ASTContext::mergeObjCGCQualifiers(QualType LHS, QualType RHS) { 4639 QualType LHSCan = getCanonicalType(LHS), 4640 RHSCan = getCanonicalType(RHS); 4641 // If two types are identical, they are compatible. 4642 if (LHSCan == RHSCan) 4643 return LHS; 4644 if (RHSCan->isFunctionType()) { 4645 if (!LHSCan->isFunctionType()) 4646 return QualType(); 4647 QualType OldReturnType = 4648 cast<FunctionType>(RHSCan.getTypePtr())->getResultType(); 4649 QualType NewReturnType = 4650 cast<FunctionType>(LHSCan.getTypePtr())->getResultType(); 4651 QualType ResReturnType = 4652 mergeObjCGCQualifiers(NewReturnType, OldReturnType); 4653 if (ResReturnType.isNull()) 4654 return QualType(); 4655 if (ResReturnType == NewReturnType || ResReturnType == OldReturnType) { 4656 // id foo(); ... __strong id foo(); or: __strong id foo(); ... id foo(); 4657 // In either case, use OldReturnType to build the new function type. 4658 const FunctionType *F = LHS->getAs<FunctionType>(); 4659 if (const FunctionProtoType *FPT = cast<FunctionProtoType>(F)) { 4660 FunctionType::ExtInfo Info = getFunctionExtInfo(LHS); 4661 QualType ResultType 4662 = getFunctionType(OldReturnType, FPT->arg_type_begin(), 4663 FPT->getNumArgs(), FPT->isVariadic(), 4664 FPT->getTypeQuals(), 4665 FPT->hasExceptionSpec(), 4666 FPT->hasAnyExceptionSpec(), 4667 FPT->getNumExceptions(), 4668 FPT->exception_begin(), 4669 Info); 4670 return ResultType; 4671 } 4672 } 4673 return QualType(); 4674 } 4675 4676 // If the qualifiers are different, the types can still be merged. 4677 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 4678 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 4679 if (LQuals != RQuals) { 4680 // If any of these qualifiers are different, we have a type mismatch. 4681 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 4682 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 4683 return QualType(); 4684 4685 // Exactly one GC qualifier difference is allowed: __strong is 4686 // okay if the other type has no GC qualifier but is an Objective 4687 // C object pointer (i.e. implicitly strong by default). We fix 4688 // this by pretending that the unqualified type was actually 4689 // qualified __strong. 4690 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 4691 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 4692 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 4693 4694 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 4695 return QualType(); 4696 4697 if (GC_L == Qualifiers::Strong) 4698 return LHS; 4699 if (GC_R == Qualifiers::Strong) 4700 return RHS; 4701 return QualType(); 4702 } 4703 4704 if (LHSCan->isObjCObjectPointerType() && RHSCan->isObjCObjectPointerType()) { 4705 QualType LHSBaseQT = LHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 4706 QualType RHSBaseQT = RHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 4707 QualType ResQT = mergeObjCGCQualifiers(LHSBaseQT, RHSBaseQT); 4708 if (ResQT == LHSBaseQT) 4709 return LHS; 4710 if (ResQT == RHSBaseQT) 4711 return RHS; 4712 } 4713 return QualType(); 4714} 4715 4716//===----------------------------------------------------------------------===// 4717// Integer Predicates 4718//===----------------------------------------------------------------------===// 4719 4720unsigned ASTContext::getIntWidth(QualType T) { 4721 if (T->isBooleanType()) 4722 return 1; 4723 if (EnumType *ET = dyn_cast<EnumType>(T)) 4724 T = ET->getDecl()->getIntegerType(); 4725 // For builtin types, just use the standard type sizing method 4726 return (unsigned)getTypeSize(T); 4727} 4728 4729QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4730 assert(T->isSignedIntegerType() && "Unexpected type"); 4731 4732 // Turn <4 x signed int> -> <4 x unsigned int> 4733 if (const VectorType *VTy = T->getAs<VectorType>()) 4734 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4735 VTy->getNumElements(), VTy->isAltiVec(), VTy->isPixel()); 4736 4737 // For enums, we return the unsigned version of the base type. 4738 if (const EnumType *ETy = T->getAs<EnumType>()) 4739 T = ETy->getDecl()->getIntegerType(); 4740 4741 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4742 assert(BTy && "Unexpected signed integer type"); 4743 switch (BTy->getKind()) { 4744 case BuiltinType::Char_S: 4745 case BuiltinType::SChar: 4746 return UnsignedCharTy; 4747 case BuiltinType::Short: 4748 return UnsignedShortTy; 4749 case BuiltinType::Int: 4750 return UnsignedIntTy; 4751 case BuiltinType::Long: 4752 return UnsignedLongTy; 4753 case BuiltinType::LongLong: 4754 return UnsignedLongLongTy; 4755 case BuiltinType::Int128: 4756 return UnsignedInt128Ty; 4757 default: 4758 assert(0 && "Unexpected signed integer type"); 4759 return QualType(); 4760 } 4761} 4762 4763ExternalASTSource::~ExternalASTSource() { } 4764 4765void ExternalASTSource::PrintStats() { } 4766 4767 4768//===----------------------------------------------------------------------===// 4769// Builtin Type Computation 4770//===----------------------------------------------------------------------===// 4771 4772/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4773/// pointer over the consumed characters. This returns the resultant type. 4774static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4775 ASTContext::GetBuiltinTypeError &Error, 4776 bool AllowTypeModifiers = true) { 4777 // Modifiers. 4778 int HowLong = 0; 4779 bool Signed = false, Unsigned = false; 4780 4781 // Read the modifiers first. 4782 bool Done = false; 4783 while (!Done) { 4784 switch (*Str++) { 4785 default: Done = true; --Str; break; 4786 case 'S': 4787 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4788 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4789 Signed = true; 4790 break; 4791 case 'U': 4792 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4793 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4794 Unsigned = true; 4795 break; 4796 case 'L': 4797 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4798 ++HowLong; 4799 break; 4800 } 4801 } 4802 4803 QualType Type; 4804 4805 // Read the base type. 4806 switch (*Str++) { 4807 default: assert(0 && "Unknown builtin type letter!"); 4808 case 'v': 4809 assert(HowLong == 0 && !Signed && !Unsigned && 4810 "Bad modifiers used with 'v'!"); 4811 Type = Context.VoidTy; 4812 break; 4813 case 'f': 4814 assert(HowLong == 0 && !Signed && !Unsigned && 4815 "Bad modifiers used with 'f'!"); 4816 Type = Context.FloatTy; 4817 break; 4818 case 'd': 4819 assert(HowLong < 2 && !Signed && !Unsigned && 4820 "Bad modifiers used with 'd'!"); 4821 if (HowLong) 4822 Type = Context.LongDoubleTy; 4823 else 4824 Type = Context.DoubleTy; 4825 break; 4826 case 's': 4827 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4828 if (Unsigned) 4829 Type = Context.UnsignedShortTy; 4830 else 4831 Type = Context.ShortTy; 4832 break; 4833 case 'i': 4834 if (HowLong == 3) 4835 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4836 else if (HowLong == 2) 4837 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4838 else if (HowLong == 1) 4839 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4840 else 4841 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4842 break; 4843 case 'c': 4844 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4845 if (Signed) 4846 Type = Context.SignedCharTy; 4847 else if (Unsigned) 4848 Type = Context.UnsignedCharTy; 4849 else 4850 Type = Context.CharTy; 4851 break; 4852 case 'b': // boolean 4853 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4854 Type = Context.BoolTy; 4855 break; 4856 case 'z': // size_t. 4857 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4858 Type = Context.getSizeType(); 4859 break; 4860 case 'F': 4861 Type = Context.getCFConstantStringType(); 4862 break; 4863 case 'a': 4864 Type = Context.getBuiltinVaListType(); 4865 assert(!Type.isNull() && "builtin va list type not initialized!"); 4866 break; 4867 case 'A': 4868 // This is a "reference" to a va_list; however, what exactly 4869 // this means depends on how va_list is defined. There are two 4870 // different kinds of va_list: ones passed by value, and ones 4871 // passed by reference. An example of a by-value va_list is 4872 // x86, where va_list is a char*. An example of by-ref va_list 4873 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4874 // we want this argument to be a char*&; for x86-64, we want 4875 // it to be a __va_list_tag*. 4876 Type = Context.getBuiltinVaListType(); 4877 assert(!Type.isNull() && "builtin va list type not initialized!"); 4878 if (Type->isArrayType()) { 4879 Type = Context.getArrayDecayedType(Type); 4880 } else { 4881 Type = Context.getLValueReferenceType(Type); 4882 } 4883 break; 4884 case 'V': { 4885 char *End; 4886 unsigned NumElements = strtoul(Str, &End, 10); 4887 assert(End != Str && "Missing vector size"); 4888 4889 Str = End; 4890 4891 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4892 // FIXME: Don't know what to do about AltiVec. 4893 Type = Context.getVectorType(ElementType, NumElements, false, false); 4894 break; 4895 } 4896 case 'X': { 4897 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4898 Type = Context.getComplexType(ElementType); 4899 break; 4900 } 4901 case 'P': 4902 Type = Context.getFILEType(); 4903 if (Type.isNull()) { 4904 Error = ASTContext::GE_Missing_stdio; 4905 return QualType(); 4906 } 4907 break; 4908 case 'J': 4909 if (Signed) 4910 Type = Context.getsigjmp_bufType(); 4911 else 4912 Type = Context.getjmp_bufType(); 4913 4914 if (Type.isNull()) { 4915 Error = ASTContext::GE_Missing_setjmp; 4916 return QualType(); 4917 } 4918 break; 4919 } 4920 4921 if (!AllowTypeModifiers) 4922 return Type; 4923 4924 Done = false; 4925 while (!Done) { 4926 switch (char c = *Str++) { 4927 default: Done = true; --Str; break; 4928 case '*': 4929 case '&': 4930 { 4931 // Both pointers and references can have their pointee types 4932 // qualified with an address space. 4933 char *End; 4934 unsigned AddrSpace = strtoul(Str, &End, 10); 4935 if (End != Str && AddrSpace != 0) { 4936 Type = Context.getAddrSpaceQualType(Type, AddrSpace); 4937 Str = End; 4938 } 4939 } 4940 if (c == '*') 4941 Type = Context.getPointerType(Type); 4942 else 4943 Type = Context.getLValueReferenceType(Type); 4944 break; 4945 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4946 case 'C': 4947 Type = Type.withConst(); 4948 break; 4949 case 'D': 4950 Type = Context.getVolatileType(Type); 4951 break; 4952 } 4953 } 4954 4955 return Type; 4956} 4957 4958/// GetBuiltinType - Return the type for the specified builtin. 4959QualType ASTContext::GetBuiltinType(unsigned id, 4960 GetBuiltinTypeError &Error) { 4961 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4962 4963 llvm::SmallVector<QualType, 8> ArgTypes; 4964 4965 Error = GE_None; 4966 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4967 if (Error != GE_None) 4968 return QualType(); 4969 while (TypeStr[0] && TypeStr[0] != '.') { 4970 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4971 if (Error != GE_None) 4972 return QualType(); 4973 4974 // Do array -> pointer decay. The builtin should use the decayed type. 4975 if (Ty->isArrayType()) 4976 Ty = getArrayDecayedType(Ty); 4977 4978 ArgTypes.push_back(Ty); 4979 } 4980 4981 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4982 "'.' should only occur at end of builtin type list!"); 4983 4984 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4985 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4986 return getFunctionNoProtoType(ResType); 4987 4988 // FIXME: Should we create noreturn types? 4989 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4990 TypeStr[0] == '.', 0, false, false, 0, 0, 4991 FunctionType::ExtInfo()); 4992} 4993 4994QualType 4995ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4996 // Perform the usual unary conversions. We do this early so that 4997 // integral promotions to "int" can allow us to exit early, in the 4998 // lhs == rhs check. Also, for conversion purposes, we ignore any 4999 // qualifiers. For example, "const float" and "float" are 5000 // equivalent. 5001 if (lhs->isPromotableIntegerType()) 5002 lhs = getPromotedIntegerType(lhs); 5003 else 5004 lhs = lhs.getUnqualifiedType(); 5005 if (rhs->isPromotableIntegerType()) 5006 rhs = getPromotedIntegerType(rhs); 5007 else 5008 rhs = rhs.getUnqualifiedType(); 5009 5010 // If both types are identical, no conversion is needed. 5011 if (lhs == rhs) 5012 return lhs; 5013 5014 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 5015 // The caller can deal with this (e.g. pointer + int). 5016 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 5017 return lhs; 5018 5019 // At this point, we have two different arithmetic types. 5020 5021 // Handle complex types first (C99 6.3.1.8p1). 5022 if (lhs->isComplexType() || rhs->isComplexType()) { 5023 // if we have an integer operand, the result is the complex type. 5024 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 5025 // convert the rhs to the lhs complex type. 5026 return lhs; 5027 } 5028 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 5029 // convert the lhs to the rhs complex type. 5030 return rhs; 5031 } 5032 // This handles complex/complex, complex/float, or float/complex. 5033 // When both operands are complex, the shorter operand is converted to the 5034 // type of the longer, and that is the type of the result. This corresponds 5035 // to what is done when combining two real floating-point operands. 5036 // The fun begins when size promotion occur across type domains. 5037 // From H&S 6.3.4: When one operand is complex and the other is a real 5038 // floating-point type, the less precise type is converted, within it's 5039 // real or complex domain, to the precision of the other type. For example, 5040 // when combining a "long double" with a "double _Complex", the 5041 // "double _Complex" is promoted to "long double _Complex". 5042 int result = getFloatingTypeOrder(lhs, rhs); 5043 5044 if (result > 0) { // The left side is bigger, convert rhs. 5045 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 5046 } else if (result < 0) { // The right side is bigger, convert lhs. 5047 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 5048 } 5049 // At this point, lhs and rhs have the same rank/size. Now, make sure the 5050 // domains match. This is a requirement for our implementation, C99 5051 // does not require this promotion. 5052 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 5053 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 5054 return rhs; 5055 } else { // handle "_Complex double, double". 5056 return lhs; 5057 } 5058 } 5059 return lhs; // The domain/size match exactly. 5060 } 5061 // Now handle "real" floating types (i.e. float, double, long double). 5062 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 5063 // if we have an integer operand, the result is the real floating type. 5064 if (rhs->isIntegerType()) { 5065 // convert rhs to the lhs floating point type. 5066 return lhs; 5067 } 5068 if (rhs->isComplexIntegerType()) { 5069 // convert rhs to the complex floating point type. 5070 return getComplexType(lhs); 5071 } 5072 if (lhs->isIntegerType()) { 5073 // convert lhs to the rhs floating point type. 5074 return rhs; 5075 } 5076 if (lhs->isComplexIntegerType()) { 5077 // convert lhs to the complex floating point type. 5078 return getComplexType(rhs); 5079 } 5080 // We have two real floating types, float/complex combos were handled above. 5081 // Convert the smaller operand to the bigger result. 5082 int result = getFloatingTypeOrder(lhs, rhs); 5083 if (result > 0) // convert the rhs 5084 return lhs; 5085 assert(result < 0 && "illegal float comparison"); 5086 return rhs; // convert the lhs 5087 } 5088 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 5089 // Handle GCC complex int extension. 5090 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 5091 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 5092 5093 if (lhsComplexInt && rhsComplexInt) { 5094 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 5095 rhsComplexInt->getElementType()) >= 0) 5096 return lhs; // convert the rhs 5097 return rhs; 5098 } else if (lhsComplexInt && rhs->isIntegerType()) { 5099 // convert the rhs to the lhs complex type. 5100 return lhs; 5101 } else if (rhsComplexInt && lhs->isIntegerType()) { 5102 // convert the lhs to the rhs complex type. 5103 return rhs; 5104 } 5105 } 5106 // Finally, we have two differing integer types. 5107 // The rules for this case are in C99 6.3.1.8 5108 int compare = getIntegerTypeOrder(lhs, rhs); 5109 bool lhsSigned = lhs->isSignedIntegerType(), 5110 rhsSigned = rhs->isSignedIntegerType(); 5111 QualType destType; 5112 if (lhsSigned == rhsSigned) { 5113 // Same signedness; use the higher-ranked type 5114 destType = compare >= 0 ? lhs : rhs; 5115 } else if (compare != (lhsSigned ? 1 : -1)) { 5116 // The unsigned type has greater than or equal rank to the 5117 // signed type, so use the unsigned type 5118 destType = lhsSigned ? rhs : lhs; 5119 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 5120 // The two types are different widths; if we are here, that 5121 // means the signed type is larger than the unsigned type, so 5122 // use the signed type. 5123 destType = lhsSigned ? lhs : rhs; 5124 } else { 5125 // The signed type is higher-ranked than the unsigned type, 5126 // but isn't actually any bigger (like unsigned int and long 5127 // on most 32-bit systems). Use the unsigned type corresponding 5128 // to the signed type. 5129 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 5130 } 5131 return destType; 5132} 5133