ASTContext.cpp revision 31f17ecbef57b5679c017c375db330546b7b5145
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/ExternalASTSource.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/Basic/Builtins.h" 24#include "clang/Basic/SourceManager.h" 25#include "clang/Basic/TargetInfo.h" 26#include "llvm/ADT/SmallString.h" 27#include "llvm/ADT/StringExtras.h" 28#include "llvm/Support/MathExtras.h" 29#include "llvm/Support/raw_ostream.h" 30#include "RecordLayoutBuilder.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), ExternalSource(0), PrintingPolicy(LOpts), 50 LastSDM(0, 0) { 51 ObjCIdRedefinitionType = QualType(); 52 ObjCClassRedefinitionType = QualType(); 53 ObjCSelRedefinitionType = QualType(); 54 if (size_reserve > 0) Types.reserve(size_reserve); 55 TUDecl = TranslationUnitDecl::Create(*this); 56 InitBuiltinTypes(); 57} 58 59ASTContext::~ASTContext() { 60 // Release the DenseMaps associated with DeclContext objects. 61 // FIXME: Is this the ideal solution? 62 ReleaseDeclContextMaps(); 63 64 // Release all of the memory associated with overridden C++ methods. 65 for (llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::iterator 66 OM = OverriddenMethods.begin(), OMEnd = OverriddenMethods.end(); 67 OM != OMEnd; ++OM) 68 OM->second.Destroy(); 69 70 if (FreeMemory) { 71 // Deallocate all the types. 72 while (!Types.empty()) { 73 Types.back()->Destroy(*this); 74 Types.pop_back(); 75 } 76 77 for (llvm::FoldingSet<ExtQuals>::iterator 78 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); I != E; ) { 79 // Increment in loop to prevent using deallocated memory. 80 Deallocate(&*I++); 81 } 82 83 for (llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 84 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); I != E; ) { 85 // Increment in loop to prevent using deallocated memory. 86 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 87 R->Destroy(*this); 88 } 89 90 for (llvm::DenseMap<const ObjCContainerDecl*, 91 const ASTRecordLayout*>::iterator 92 I = ObjCLayouts.begin(), E = ObjCLayouts.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 99 // Destroy nested-name-specifiers. 100 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 101 NNS = NestedNameSpecifiers.begin(), 102 NNSEnd = NestedNameSpecifiers.end(); 103 NNS != NNSEnd; ) { 104 // Increment in loop to prevent using deallocated memory. 105 (*NNS++).Destroy(*this); 106 } 107 108 if (GlobalNestedNameSpecifier) 109 GlobalNestedNameSpecifier->Destroy(*this); 110 111 TUDecl->Destroy(*this); 112} 113 114void 115ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 116 ExternalSource.reset(Source.take()); 117} 118 119void ASTContext::PrintStats() const { 120 fprintf(stderr, "*** AST Context Stats:\n"); 121 fprintf(stderr, " %d types total.\n", (int)Types.size()); 122 123 unsigned counts[] = { 124#define TYPE(Name, Parent) 0, 125#define ABSTRACT_TYPE(Name, Parent) 126#include "clang/AST/TypeNodes.def" 127 0 // Extra 128 }; 129 130 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 131 Type *T = Types[i]; 132 counts[(unsigned)T->getTypeClass()]++; 133 } 134 135 unsigned Idx = 0; 136 unsigned TotalBytes = 0; 137#define TYPE(Name, Parent) \ 138 if (counts[Idx]) \ 139 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 140 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 141 ++Idx; 142#define ABSTRACT_TYPE(Name, Parent) 143#include "clang/AST/TypeNodes.def" 144 145 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 146 147 if (ExternalSource.get()) { 148 fprintf(stderr, "\n"); 149 ExternalSource->PrintStats(); 150 } 151} 152 153 154void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 155 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 156 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 157 Types.push_back(Ty); 158} 159 160void ASTContext::InitBuiltinTypes() { 161 assert(VoidTy.isNull() && "Context reinitialized?"); 162 163 // C99 6.2.5p19. 164 InitBuiltinType(VoidTy, BuiltinType::Void); 165 166 // C99 6.2.5p2. 167 InitBuiltinType(BoolTy, BuiltinType::Bool); 168 // C99 6.2.5p3. 169 if (LangOpts.CharIsSigned) 170 InitBuiltinType(CharTy, BuiltinType::Char_S); 171 else 172 InitBuiltinType(CharTy, BuiltinType::Char_U); 173 // C99 6.2.5p4. 174 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 175 InitBuiltinType(ShortTy, BuiltinType::Short); 176 InitBuiltinType(IntTy, BuiltinType::Int); 177 InitBuiltinType(LongTy, BuiltinType::Long); 178 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 179 180 // C99 6.2.5p6. 181 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 182 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 183 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 184 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 185 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 186 187 // C99 6.2.5p10. 188 InitBuiltinType(FloatTy, BuiltinType::Float); 189 InitBuiltinType(DoubleTy, BuiltinType::Double); 190 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 191 192 // GNU extension, 128-bit integers. 193 InitBuiltinType(Int128Ty, BuiltinType::Int128); 194 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 195 196 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 197 InitBuiltinType(WCharTy, BuiltinType::WChar); 198 else // C99 199 WCharTy = getFromTargetType(Target.getWCharType()); 200 201 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 202 InitBuiltinType(Char16Ty, BuiltinType::Char16); 203 else // C99 204 Char16Ty = getFromTargetType(Target.getChar16Type()); 205 206 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 207 InitBuiltinType(Char32Ty, BuiltinType::Char32); 208 else // C99 209 Char32Ty = getFromTargetType(Target.getChar32Type()); 210 211 // Placeholder type for functions. 212 InitBuiltinType(OverloadTy, BuiltinType::Overload); 213 214 // Placeholder type for type-dependent expressions whose type is 215 // completely unknown. No code should ever check a type against 216 // DependentTy and users should never see it; however, it is here to 217 // help diagnose failures to properly check for type-dependent 218 // expressions. 219 InitBuiltinType(DependentTy, BuiltinType::Dependent); 220 221 // Placeholder type for C++0x auto declarations whose real type has 222 // not yet been deduced. 223 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 224 225 // C99 6.2.5p11. 226 FloatComplexTy = getComplexType(FloatTy); 227 DoubleComplexTy = getComplexType(DoubleTy); 228 LongDoubleComplexTy = getComplexType(LongDoubleTy); 229 230 BuiltinVaListType = QualType(); 231 232 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 233 ObjCIdTypedefType = QualType(); 234 ObjCClassTypedefType = QualType(); 235 ObjCSelTypedefType = QualType(); 236 237 // Builtin types for 'id', 'Class', and 'SEL'. 238 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 239 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 240 InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel); 241 242 ObjCConstantStringType = QualType(); 243 244 // void * type 245 VoidPtrTy = getPointerType(VoidTy); 246 247 // nullptr type (C++0x 2.14.7) 248 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 249} 250 251MemberSpecializationInfo * 252ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 253 assert(Var->isStaticDataMember() && "Not a static data member"); 254 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 255 = InstantiatedFromStaticDataMember.find(Var); 256 if (Pos == InstantiatedFromStaticDataMember.end()) 257 return 0; 258 259 return Pos->second; 260} 261 262void 263ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 264 TemplateSpecializationKind TSK) { 265 assert(Inst->isStaticDataMember() && "Not a static data member"); 266 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 267 assert(!InstantiatedFromStaticDataMember[Inst] && 268 "Already noted what static data member was instantiated from"); 269 InstantiatedFromStaticDataMember[Inst] 270 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 271} 272 273NamedDecl * 274ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) { 275 llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos 276 = InstantiatedFromUsingDecl.find(UUD); 277 if (Pos == InstantiatedFromUsingDecl.end()) 278 return 0; 279 280 return Pos->second; 281} 282 283void 284ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) { 285 assert((isa<UsingDecl>(Pattern) || 286 isa<UnresolvedUsingValueDecl>(Pattern) || 287 isa<UnresolvedUsingTypenameDecl>(Pattern)) && 288 "pattern decl is not a using decl"); 289 assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists"); 290 InstantiatedFromUsingDecl[Inst] = Pattern; 291} 292 293UsingShadowDecl * 294ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) { 295 llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos 296 = InstantiatedFromUsingShadowDecl.find(Inst); 297 if (Pos == InstantiatedFromUsingShadowDecl.end()) 298 return 0; 299 300 return Pos->second; 301} 302 303void 304ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst, 305 UsingShadowDecl *Pattern) { 306 assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists"); 307 InstantiatedFromUsingShadowDecl[Inst] = Pattern; 308} 309 310FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 311 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 312 = InstantiatedFromUnnamedFieldDecl.find(Field); 313 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 314 return 0; 315 316 return Pos->second; 317} 318 319void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 320 FieldDecl *Tmpl) { 321 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 322 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 323 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 324 "Already noted what unnamed field was instantiated from"); 325 326 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 327} 328 329ASTContext::overridden_cxx_method_iterator 330ASTContext::overridden_methods_begin(const CXXMethodDecl *Method) const { 331 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 332 = OverriddenMethods.find(Method); 333 if (Pos == OverriddenMethods.end()) 334 return 0; 335 336 return Pos->second.begin(); 337} 338 339ASTContext::overridden_cxx_method_iterator 340ASTContext::overridden_methods_end(const CXXMethodDecl *Method) const { 341 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 342 = OverriddenMethods.find(Method); 343 if (Pos == OverriddenMethods.end()) 344 return 0; 345 346 return Pos->second.end(); 347} 348 349void ASTContext::addOverriddenMethod(const CXXMethodDecl *Method, 350 const CXXMethodDecl *Overridden) { 351 OverriddenMethods[Method].push_back(Overridden); 352} 353 354namespace { 355 class BeforeInTranslationUnit 356 : std::binary_function<SourceRange, SourceRange, bool> { 357 SourceManager *SourceMgr; 358 359 public: 360 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 361 362 bool operator()(SourceRange X, SourceRange Y) { 363 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 364 } 365 }; 366} 367 368//===----------------------------------------------------------------------===// 369// Type Sizing and Analysis 370//===----------------------------------------------------------------------===// 371 372/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 373/// scalar floating point type. 374const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 375 const BuiltinType *BT = T->getAs<BuiltinType>(); 376 assert(BT && "Not a floating point type!"); 377 switch (BT->getKind()) { 378 default: assert(0 && "Not a floating point type!"); 379 case BuiltinType::Float: return Target.getFloatFormat(); 380 case BuiltinType::Double: return Target.getDoubleFormat(); 381 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 382 } 383} 384 385/// getDeclAlign - Return a conservative estimate of the alignment of the 386/// specified decl. Note that bitfields do not have a valid alignment, so 387/// this method will assert on them. 388/// If @p RefAsPointee, references are treated like their underlying type 389/// (for alignof), else they're treated like pointers (for CodeGen). 390CharUnits ASTContext::getDeclAlign(const Decl *D, bool RefAsPointee) { 391 unsigned Align = Target.getCharWidth(); 392 393 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 394 Align = std::max(Align, AA->getMaxAlignment()); 395 396 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 397 QualType T = VD->getType(); 398 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 399 if (RefAsPointee) 400 T = RT->getPointeeType(); 401 else 402 T = getPointerType(RT->getPointeeType()); 403 } 404 if (!T->isIncompleteType() && !T->isFunctionType()) { 405 // Incomplete or function types default to 1. 406 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 407 T = cast<ArrayType>(T)->getElementType(); 408 409 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 410 } 411 if (const FieldDecl *FD = dyn_cast<FieldDecl>(VD)) { 412 // In the case of a field in a packed struct, we want the minimum 413 // of the alignment of the field and the alignment of the struct. 414 Align = std::min(Align, 415 getPreferredTypeAlign(FD->getParent()->getTypeForDecl())); 416 } 417 } 418 419 return CharUnits::fromQuantity(Align / Target.getCharWidth()); 420} 421 422/// getTypeSize - Return the size of the specified type, in bits. This method 423/// does not work on incomplete types. 424/// 425/// FIXME: Pointers into different addr spaces could have different sizes and 426/// alignment requirements: getPointerInfo should take an AddrSpace, this 427/// should take a QualType, &c. 428std::pair<uint64_t, unsigned> 429ASTContext::getTypeInfo(const Type *T) { 430 uint64_t Width=0; 431 unsigned Align=8; 432 switch (T->getTypeClass()) { 433#define TYPE(Class, Base) 434#define ABSTRACT_TYPE(Class, Base) 435#define NON_CANONICAL_TYPE(Class, Base) 436#define DEPENDENT_TYPE(Class, Base) case Type::Class: 437#include "clang/AST/TypeNodes.def" 438 assert(false && "Should not see dependent types"); 439 break; 440 441 case Type::FunctionNoProto: 442 case Type::FunctionProto: 443 // GCC extension: alignof(function) = 32 bits 444 Width = 0; 445 Align = 32; 446 break; 447 448 case Type::IncompleteArray: 449 case Type::VariableArray: 450 Width = 0; 451 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 452 break; 453 454 case Type::ConstantArray: { 455 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 456 457 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 458 Width = EltInfo.first*CAT->getSize().getZExtValue(); 459 Align = EltInfo.second; 460 break; 461 } 462 case Type::ExtVector: 463 case Type::Vector: { 464 const VectorType *VT = cast<VectorType>(T); 465 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 466 Width = EltInfo.first*VT->getNumElements(); 467 Align = Width; 468 // If the alignment is not a power of 2, round up to the next power of 2. 469 // This happens for non-power-of-2 length vectors. 470 if (Align & (Align-1)) { 471 Align = llvm::NextPowerOf2(Align); 472 Width = llvm::RoundUpToAlignment(Width, Align); 473 } 474 break; 475 } 476 477 case Type::Builtin: 478 switch (cast<BuiltinType>(T)->getKind()) { 479 default: assert(0 && "Unknown builtin type!"); 480 case BuiltinType::Void: 481 // GCC extension: alignof(void) = 8 bits. 482 Width = 0; 483 Align = 8; 484 break; 485 486 case BuiltinType::Bool: 487 Width = Target.getBoolWidth(); 488 Align = Target.getBoolAlign(); 489 break; 490 case BuiltinType::Char_S: 491 case BuiltinType::Char_U: 492 case BuiltinType::UChar: 493 case BuiltinType::SChar: 494 Width = Target.getCharWidth(); 495 Align = Target.getCharAlign(); 496 break; 497 case BuiltinType::WChar: 498 Width = Target.getWCharWidth(); 499 Align = Target.getWCharAlign(); 500 break; 501 case BuiltinType::Char16: 502 Width = Target.getChar16Width(); 503 Align = Target.getChar16Align(); 504 break; 505 case BuiltinType::Char32: 506 Width = Target.getChar32Width(); 507 Align = Target.getChar32Align(); 508 break; 509 case BuiltinType::UShort: 510 case BuiltinType::Short: 511 Width = Target.getShortWidth(); 512 Align = Target.getShortAlign(); 513 break; 514 case BuiltinType::UInt: 515 case BuiltinType::Int: 516 Width = Target.getIntWidth(); 517 Align = Target.getIntAlign(); 518 break; 519 case BuiltinType::ULong: 520 case BuiltinType::Long: 521 Width = Target.getLongWidth(); 522 Align = Target.getLongAlign(); 523 break; 524 case BuiltinType::ULongLong: 525 case BuiltinType::LongLong: 526 Width = Target.getLongLongWidth(); 527 Align = Target.getLongLongAlign(); 528 break; 529 case BuiltinType::Int128: 530 case BuiltinType::UInt128: 531 Width = 128; 532 Align = 128; // int128_t is 128-bit aligned on all targets. 533 break; 534 case BuiltinType::Float: 535 Width = Target.getFloatWidth(); 536 Align = Target.getFloatAlign(); 537 break; 538 case BuiltinType::Double: 539 Width = Target.getDoubleWidth(); 540 Align = Target.getDoubleAlign(); 541 break; 542 case BuiltinType::LongDouble: 543 Width = Target.getLongDoubleWidth(); 544 Align = Target.getLongDoubleAlign(); 545 break; 546 case BuiltinType::NullPtr: 547 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 548 Align = Target.getPointerAlign(0); // == sizeof(void*) 549 break; 550 } 551 break; 552 case Type::ObjCObjectPointer: 553 Width = Target.getPointerWidth(0); 554 Align = Target.getPointerAlign(0); 555 break; 556 case Type::BlockPointer: { 557 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 558 Width = Target.getPointerWidth(AS); 559 Align = Target.getPointerAlign(AS); 560 break; 561 } 562 case Type::LValueReference: 563 case Type::RValueReference: { 564 // alignof and sizeof should never enter this code path here, so we go 565 // the pointer route. 566 unsigned AS = cast<ReferenceType>(T)->getPointeeType().getAddressSpace(); 567 Width = Target.getPointerWidth(AS); 568 Align = Target.getPointerAlign(AS); 569 break; 570 } 571 case Type::Pointer: { 572 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 573 Width = Target.getPointerWidth(AS); 574 Align = Target.getPointerAlign(AS); 575 break; 576 } 577 case Type::MemberPointer: { 578 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 579 std::pair<uint64_t, unsigned> PtrDiffInfo = 580 getTypeInfo(getPointerDiffType()); 581 Width = PtrDiffInfo.first; 582 if (Pointee->isFunctionType()) 583 Width *= 2; 584 Align = PtrDiffInfo.second; 585 break; 586 } 587 case Type::Complex: { 588 // Complex types have the same alignment as their elements, but twice the 589 // size. 590 std::pair<uint64_t, unsigned> EltInfo = 591 getTypeInfo(cast<ComplexType>(T)->getElementType()); 592 Width = EltInfo.first*2; 593 Align = EltInfo.second; 594 break; 595 } 596 case Type::ObjCInterface: { 597 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 598 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 599 Width = Layout.getSize(); 600 Align = Layout.getAlignment(); 601 break; 602 } 603 case Type::Record: 604 case Type::Enum: { 605 const TagType *TT = cast<TagType>(T); 606 607 if (TT->getDecl()->isInvalidDecl()) { 608 Width = 1; 609 Align = 1; 610 break; 611 } 612 613 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 614 return getTypeInfo(ET->getDecl()->getIntegerType()); 615 616 const RecordType *RT = cast<RecordType>(TT); 617 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 618 Width = Layout.getSize(); 619 Align = Layout.getAlignment(); 620 break; 621 } 622 623 case Type::SubstTemplateTypeParm: 624 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 625 getReplacementType().getTypePtr()); 626 627 case Type::Elaborated: 628 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType() 629 .getTypePtr()); 630 631 case Type::Typedef: { 632 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 633 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 634 Align = std::max(Aligned->getMaxAlignment(), 635 getTypeAlign(Typedef->getUnderlyingType().getTypePtr())); 636 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 637 } else 638 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 639 break; 640 } 641 642 case Type::TypeOfExpr: 643 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 644 .getTypePtr()); 645 646 case Type::TypeOf: 647 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 648 649 case Type::Decltype: 650 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 651 .getTypePtr()); 652 653 case Type::QualifiedName: 654 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 655 656 case Type::TemplateSpecialization: 657 assert(getCanonicalType(T) != T && 658 "Cannot request the size of a dependent type"); 659 // FIXME: this is likely to be wrong once we support template 660 // aliases, since a template alias could refer to a typedef that 661 // has an __aligned__ attribute on it. 662 return getTypeInfo(getCanonicalType(T)); 663 } 664 665 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 666 return std::make_pair(Width, Align); 667} 668 669/// getTypeSizeInChars - Return the size of the specified type, in characters. 670/// This method does not work on incomplete types. 671CharUnits ASTContext::getTypeSizeInChars(QualType T) { 672 return CharUnits::fromQuantity(getTypeSize(T) / getCharWidth()); 673} 674CharUnits ASTContext::getTypeSizeInChars(const Type *T) { 675 return CharUnits::fromQuantity(getTypeSize(T) / getCharWidth()); 676} 677 678/// getTypeAlignInChars - Return the ABI-specified alignment of a type, in 679/// characters. This method does not work on incomplete types. 680CharUnits ASTContext::getTypeAlignInChars(QualType T) { 681 return CharUnits::fromQuantity(getTypeAlign(T) / getCharWidth()); 682} 683CharUnits ASTContext::getTypeAlignInChars(const Type *T) { 684 return CharUnits::fromQuantity(getTypeAlign(T) / getCharWidth()); 685} 686 687/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 688/// type for the current target in bits. This can be different than the ABI 689/// alignment in cases where it is beneficial for performance to overalign 690/// a data type. 691unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 692 unsigned ABIAlign = getTypeAlign(T); 693 694 // Double and long long should be naturally aligned if possible. 695 if (const ComplexType* CT = T->getAs<ComplexType>()) 696 T = CT->getElementType().getTypePtr(); 697 if (T->isSpecificBuiltinType(BuiltinType::Double) || 698 T->isSpecificBuiltinType(BuiltinType::LongLong)) 699 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 700 701 return ABIAlign; 702} 703 704static void CollectLocalObjCIvars(ASTContext *Ctx, 705 const ObjCInterfaceDecl *OI, 706 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 707 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 708 E = OI->ivar_end(); I != E; ++I) { 709 ObjCIvarDecl *IVDecl = *I; 710 if (!IVDecl->isInvalidDecl()) 711 Fields.push_back(cast<FieldDecl>(IVDecl)); 712 } 713} 714 715void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 716 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 717 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 718 CollectObjCIvars(SuperClass, Fields); 719 CollectLocalObjCIvars(this, OI, Fields); 720} 721 722/// ShallowCollectObjCIvars - 723/// Collect all ivars, including those synthesized, in the current class. 724/// 725void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 726 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 727 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 728 E = OI->ivar_end(); I != E; ++I) { 729 Ivars.push_back(*I); 730 } 731 732 CollectNonClassIvars(OI, Ivars); 733} 734 735/// CollectNonClassIvars - 736/// This routine collects all other ivars which are not declared in the class. 737/// This includes synthesized ivars (via @synthesize) and those in 738// class's @implementation. 739/// 740void ASTContext::CollectNonClassIvars(const ObjCInterfaceDecl *OI, 741 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 742 // Find ivars declared in class extension. 743 if (const ObjCCategoryDecl *CDecl = OI->getClassExtension()) { 744 for (ObjCCategoryDecl::ivar_iterator I = CDecl->ivar_begin(), 745 E = CDecl->ivar_end(); I != E; ++I) { 746 Ivars.push_back(*I); 747 } 748 } 749 750 // Also add any ivar defined in this class's implementation. This 751 // includes synthesized ivars. 752 if (ObjCImplementationDecl *ImplDecl = OI->getImplementation()) { 753 for (ObjCImplementationDecl::ivar_iterator I = ImplDecl->ivar_begin(), 754 E = ImplDecl->ivar_end(); I != E; ++I) 755 Ivars.push_back(*I); 756 } 757} 758 759/// CollectInheritedProtocols - Collect all protocols in current class and 760/// those inherited by it. 761void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 762 llvm::SmallPtrSet<ObjCProtocolDecl*, 8> &Protocols) { 763 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 764 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 765 PE = OI->protocol_end(); P != PE; ++P) { 766 ObjCProtocolDecl *Proto = (*P); 767 Protocols.insert(Proto); 768 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 769 PE = Proto->protocol_end(); P != PE; ++P) { 770 Protocols.insert(*P); 771 CollectInheritedProtocols(*P, Protocols); 772 } 773 } 774 775 // Categories of this Interface. 776 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 777 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 778 CollectInheritedProtocols(CDeclChain, Protocols); 779 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 780 while (SD) { 781 CollectInheritedProtocols(SD, Protocols); 782 SD = SD->getSuperClass(); 783 } 784 return; 785 } 786 if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 787 for (ObjCInterfaceDecl::protocol_iterator P = OC->protocol_begin(), 788 PE = OC->protocol_end(); P != PE; ++P) { 789 ObjCProtocolDecl *Proto = (*P); 790 Protocols.insert(Proto); 791 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 792 PE = Proto->protocol_end(); P != PE; ++P) 793 CollectInheritedProtocols(*P, Protocols); 794 } 795 return; 796 } 797 if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 798 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 799 PE = OP->protocol_end(); P != PE; ++P) { 800 ObjCProtocolDecl *Proto = (*P); 801 Protocols.insert(Proto); 802 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 803 PE = Proto->protocol_end(); P != PE; ++P) 804 CollectInheritedProtocols(*P, Protocols); 805 } 806 return; 807 } 808} 809 810/// CollectIvarsToConstructOrDestruct - Collect those ivars which require 811/// construction (construct=true) or destruction (construct=false) 812/// 813void ASTContext::CollectIvarsToConstructOrDestruct(const ObjCInterfaceDecl *OI, 814 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 815 bool construct) { 816 if (!getLangOptions().CPlusPlus) 817 return; 818 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 819 E = OI->ivar_end(); I != E; ++I) { 820 ObjCIvarDecl *Iv = (*I); 821 if (const RecordType *RT = Iv->getType()->getAs<RecordType>()) { 822 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) 823 if (construct && !RD->hasTrivialConstructor() || 824 !construct && !RD->hasTrivialDestructor()) 825 Ivars.push_back(*I); 826 } 827 } 828 829 // Find ivars to construct/destruct in class extension. 830 if (const ObjCCategoryDecl *CDecl = OI->getClassExtension()) { 831 for (ObjCCategoryDecl::ivar_iterator I = CDecl->ivar_begin(), 832 E = CDecl->ivar_end(); I != E; ++I) { 833 ObjCIvarDecl *Iv = (*I); 834 if (const RecordType *RT = Iv->getType()->getAs<RecordType>()) { 835 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) 836 if (construct && !RD->hasTrivialConstructor() || 837 !construct && !RD->hasTrivialDestructor()) 838 Ivars.push_back(*I); 839 } 840 } 841 } 842 843 // Also add any ivar defined in this class's implementation. This 844 // includes synthesized ivars. 845 if (ObjCImplementationDecl *ImplDecl = OI->getImplementation()) { 846 for (ObjCImplementationDecl::ivar_iterator I = ImplDecl->ivar_begin(), 847 E = ImplDecl->ivar_end(); I != E; ++I) { 848 ObjCIvarDecl *Iv = (*I); 849 if (const RecordType *RT = Iv->getType()->getAs<RecordType>()) { 850 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) 851 if (construct && !RD->hasTrivialConstructor() || 852 !construct && !RD->hasTrivialDestructor()) 853 Ivars.push_back(*I); 854 } 855 } 856 } 857} 858 859unsigned ASTContext::CountNonClassIvars(const ObjCInterfaceDecl *OI) { 860 unsigned count = 0; 861 // Count ivars declared in class extension. 862 if (const ObjCCategoryDecl *CDecl = OI->getClassExtension()) { 863 for (ObjCCategoryDecl::ivar_iterator I = CDecl->ivar_begin(), 864 E = CDecl->ivar_end(); I != E; ++I) { 865 ++count; 866 } 867 } 868 869 // Count ivar defined in this class's implementation. This 870 // includes synthesized ivars. 871 if (ObjCImplementationDecl *ImplDecl = OI->getImplementation()) 872 for (ObjCImplementationDecl::ivar_iterator I = ImplDecl->ivar_begin(), 873 E = ImplDecl->ivar_end(); I != E; ++I) 874 ++count; 875 return count; 876} 877 878/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 879ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 880 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 881 I = ObjCImpls.find(D); 882 if (I != ObjCImpls.end()) 883 return cast<ObjCImplementationDecl>(I->second); 884 return 0; 885} 886/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 887ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 888 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 889 I = ObjCImpls.find(D); 890 if (I != ObjCImpls.end()) 891 return cast<ObjCCategoryImplDecl>(I->second); 892 return 0; 893} 894 895/// \brief Set the implementation of ObjCInterfaceDecl. 896void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 897 ObjCImplementationDecl *ImplD) { 898 assert(IFaceD && ImplD && "Passed null params"); 899 ObjCImpls[IFaceD] = ImplD; 900} 901/// \brief Set the implementation of ObjCCategoryDecl. 902void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 903 ObjCCategoryImplDecl *ImplD) { 904 assert(CatD && ImplD && "Passed null params"); 905 ObjCImpls[CatD] = ImplD; 906} 907 908/// \brief Allocate an uninitialized TypeSourceInfo. 909/// 910/// The caller should initialize the memory held by TypeSourceInfo using 911/// the TypeLoc wrappers. 912/// 913/// \param T the type that will be the basis for type source info. This type 914/// should refer to how the declarator was written in source code, not to 915/// what type semantic analysis resolved the declarator to. 916TypeSourceInfo *ASTContext::CreateTypeSourceInfo(QualType T, 917 unsigned DataSize) { 918 if (!DataSize) 919 DataSize = TypeLoc::getFullDataSizeForType(T); 920 else 921 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 922 "incorrect data size provided to CreateTypeSourceInfo!"); 923 924 TypeSourceInfo *TInfo = 925 (TypeSourceInfo*)BumpAlloc.Allocate(sizeof(TypeSourceInfo) + DataSize, 8); 926 new (TInfo) TypeSourceInfo(T); 927 return TInfo; 928} 929 930TypeSourceInfo *ASTContext::getTrivialTypeSourceInfo(QualType T, 931 SourceLocation L) { 932 TypeSourceInfo *DI = CreateTypeSourceInfo(T); 933 DI->getTypeLoc().initialize(L); 934 return DI; 935} 936 937/// getInterfaceLayoutImpl - Get or compute information about the 938/// layout of the given interface. 939/// 940/// \param Impl - If given, also include the layout of the interface's 941/// implementation. This may differ by including synthesized ivars. 942const ASTRecordLayout & 943ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 944 const ObjCImplementationDecl *Impl) { 945 assert(!D->isForwardDecl() && "Invalid interface decl!"); 946 947 // Look up this layout, if already laid out, return what we have. 948 ObjCContainerDecl *Key = 949 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 950 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 951 return *Entry; 952 953 // Add in synthesized ivar count if laying out an implementation. 954 if (Impl) { 955 unsigned SynthCount = CountNonClassIvars(D); 956 // If there aren't any sythesized ivars then reuse the interface 957 // entry. Note we can't cache this because we simply free all 958 // entries later; however we shouldn't look up implementations 959 // frequently. 960 if (SynthCount == 0) 961 return getObjCLayout(D, 0); 962 } 963 964 const ASTRecordLayout *NewEntry = 965 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 966 ObjCLayouts[Key] = NewEntry; 967 968 return *NewEntry; 969} 970 971const ASTRecordLayout & 972ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 973 return getObjCLayout(D, 0); 974} 975 976const ASTRecordLayout & 977ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 978 return getObjCLayout(D->getClassInterface(), D); 979} 980 981/// getASTRecordLayout - Get or compute information about the layout of the 982/// specified record (struct/union/class), which indicates its size and field 983/// position information. 984const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 985 D = D->getDefinition(); 986 assert(D && "Cannot get layout of forward declarations!"); 987 988 // Look up this layout, if already laid out, return what we have. 989 // Note that we can't save a reference to the entry because this function 990 // is recursive. 991 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 992 if (Entry) return *Entry; 993 994 const ASTRecordLayout *NewEntry = 995 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 996 ASTRecordLayouts[D] = NewEntry; 997 998 if (getLangOptions().DumpRecordLayouts) { 999 llvm::errs() << "\n*** Dumping AST Record Layout\n"; 1000 DumpRecordLayout(D, llvm::errs()); 1001 } 1002 1003 return *NewEntry; 1004} 1005 1006const CXXMethodDecl *ASTContext::getKeyFunction(const CXXRecordDecl *RD) { 1007 RD = cast<CXXRecordDecl>(RD->getDefinition()); 1008 assert(RD && "Cannot get key function for forward declarations!"); 1009 1010 const CXXMethodDecl *&Entry = KeyFunctions[RD]; 1011 if (!Entry) 1012 Entry = ASTRecordLayoutBuilder::ComputeKeyFunction(RD); 1013 else 1014 assert(Entry == ASTRecordLayoutBuilder::ComputeKeyFunction(RD) && 1015 "Key function changed!"); 1016 1017 return Entry; 1018} 1019 1020//===----------------------------------------------------------------------===// 1021// Type creation/memoization methods 1022//===----------------------------------------------------------------------===// 1023 1024QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1025 unsigned Fast = Quals.getFastQualifiers(); 1026 Quals.removeFastQualifiers(); 1027 1028 // Check if we've already instantiated this type. 1029 llvm::FoldingSetNodeID ID; 1030 ExtQuals::Profile(ID, TypeNode, Quals); 1031 void *InsertPos = 0; 1032 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1033 assert(EQ->getQualifiers() == Quals); 1034 QualType T = QualType(EQ, Fast); 1035 return T; 1036 } 1037 1038 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1039 ExtQualNodes.InsertNode(New, InsertPos); 1040 QualType T = QualType(New, Fast); 1041 return T; 1042} 1043 1044QualType ASTContext::getVolatileType(QualType T) { 1045 QualType CanT = getCanonicalType(T); 1046 if (CanT.isVolatileQualified()) return T; 1047 1048 QualifierCollector Quals; 1049 const Type *TypeNode = Quals.strip(T); 1050 Quals.addVolatile(); 1051 1052 return getExtQualType(TypeNode, Quals); 1053} 1054 1055QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1056 QualType CanT = getCanonicalType(T); 1057 if (CanT.getAddressSpace() == AddressSpace) 1058 return T; 1059 1060 // If we are composing extended qualifiers together, merge together 1061 // into one ExtQuals node. 1062 QualifierCollector Quals; 1063 const Type *TypeNode = Quals.strip(T); 1064 1065 // If this type already has an address space specified, it cannot get 1066 // another one. 1067 assert(!Quals.hasAddressSpace() && 1068 "Type cannot be in multiple addr spaces!"); 1069 Quals.addAddressSpace(AddressSpace); 1070 1071 return getExtQualType(TypeNode, Quals); 1072} 1073 1074QualType ASTContext::getObjCGCQualType(QualType T, 1075 Qualifiers::GC GCAttr) { 1076 QualType CanT = getCanonicalType(T); 1077 if (CanT.getObjCGCAttr() == GCAttr) 1078 return T; 1079 1080 if (T->isPointerType()) { 1081 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1082 if (Pointee->isAnyPointerType()) { 1083 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1084 return getPointerType(ResultType); 1085 } 1086 } 1087 1088 // If we are composing extended qualifiers together, merge together 1089 // into one ExtQuals node. 1090 QualifierCollector Quals; 1091 const Type *TypeNode = Quals.strip(T); 1092 1093 // If this type already has an ObjCGC specified, it cannot get 1094 // another one. 1095 assert(!Quals.hasObjCGCAttr() && 1096 "Type cannot have multiple ObjCGCs!"); 1097 Quals.addObjCGCAttr(GCAttr); 1098 1099 return getExtQualType(TypeNode, Quals); 1100} 1101 1102static QualType getExtFunctionType(ASTContext& Context, QualType T, 1103 const FunctionType::ExtInfo &Info) { 1104 QualType ResultType; 1105 if (const PointerType *Pointer = T->getAs<PointerType>()) { 1106 QualType Pointee = Pointer->getPointeeType(); 1107 ResultType = getExtFunctionType(Context, Pointee, Info); 1108 if (ResultType == Pointee) 1109 return T; 1110 1111 ResultType = Context.getPointerType(ResultType); 1112 } else if (const BlockPointerType *BlockPointer 1113 = T->getAs<BlockPointerType>()) { 1114 QualType Pointee = BlockPointer->getPointeeType(); 1115 ResultType = getExtFunctionType(Context, Pointee, Info); 1116 if (ResultType == Pointee) 1117 return T; 1118 1119 ResultType = Context.getBlockPointerType(ResultType); 1120 } else if (const FunctionType *F = T->getAs<FunctionType>()) { 1121 if (F->getExtInfo() == Info) 1122 return T; 1123 1124 if (const FunctionNoProtoType *FNPT = dyn_cast<FunctionNoProtoType>(F)) { 1125 ResultType = Context.getFunctionNoProtoType(FNPT->getResultType(), 1126 Info); 1127 } else { 1128 const FunctionProtoType *FPT = cast<FunctionProtoType>(F); 1129 ResultType 1130 = Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 1131 FPT->getNumArgs(), FPT->isVariadic(), 1132 FPT->getTypeQuals(), 1133 FPT->hasExceptionSpec(), 1134 FPT->hasAnyExceptionSpec(), 1135 FPT->getNumExceptions(), 1136 FPT->exception_begin(), 1137 Info); 1138 } 1139 } else 1140 return T; 1141 1142 return Context.getQualifiedType(ResultType, T.getLocalQualifiers()); 1143} 1144 1145QualType ASTContext::getNoReturnType(QualType T, bool AddNoReturn) { 1146 FunctionType::ExtInfo Info = getFunctionExtInfo(T); 1147 return getExtFunctionType(*this, T, 1148 Info.withNoReturn(AddNoReturn)); 1149} 1150 1151QualType ASTContext::getCallConvType(QualType T, CallingConv CallConv) { 1152 FunctionType::ExtInfo Info = getFunctionExtInfo(T); 1153 return getExtFunctionType(*this, T, 1154 Info.withCallingConv(CallConv)); 1155} 1156 1157QualType ASTContext::getRegParmType(QualType T, unsigned RegParm) { 1158 FunctionType::ExtInfo Info = getFunctionExtInfo(T); 1159 return getExtFunctionType(*this, T, 1160 Info.withRegParm(RegParm)); 1161} 1162 1163/// getComplexType - Return the uniqued reference to the type for a complex 1164/// number with the specified element type. 1165QualType ASTContext::getComplexType(QualType T) { 1166 // Unique pointers, to guarantee there is only one pointer of a particular 1167 // structure. 1168 llvm::FoldingSetNodeID ID; 1169 ComplexType::Profile(ID, T); 1170 1171 void *InsertPos = 0; 1172 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1173 return QualType(CT, 0); 1174 1175 // If the pointee type isn't canonical, this won't be a canonical type either, 1176 // so fill in the canonical type field. 1177 QualType Canonical; 1178 if (!T.isCanonical()) { 1179 Canonical = getComplexType(getCanonicalType(T)); 1180 1181 // Get the new insert position for the node we care about. 1182 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1183 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1184 } 1185 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1186 Types.push_back(New); 1187 ComplexTypes.InsertNode(New, InsertPos); 1188 return QualType(New, 0); 1189} 1190 1191/// getPointerType - Return the uniqued reference to the type for a pointer to 1192/// the specified type. 1193QualType ASTContext::getPointerType(QualType T) { 1194 // Unique pointers, to guarantee there is only one pointer of a particular 1195 // structure. 1196 llvm::FoldingSetNodeID ID; 1197 PointerType::Profile(ID, T); 1198 1199 void *InsertPos = 0; 1200 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1201 return QualType(PT, 0); 1202 1203 // If the pointee type isn't canonical, this won't be a canonical type either, 1204 // so fill in the canonical type field. 1205 QualType Canonical; 1206 if (!T.isCanonical()) { 1207 Canonical = getPointerType(getCanonicalType(T)); 1208 1209 // Get the new insert position for the node we care about. 1210 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1211 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1212 } 1213 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1214 Types.push_back(New); 1215 PointerTypes.InsertNode(New, InsertPos); 1216 return QualType(New, 0); 1217} 1218 1219/// getBlockPointerType - Return the uniqued reference to the type for 1220/// a pointer to the specified block. 1221QualType ASTContext::getBlockPointerType(QualType T) { 1222 assert(T->isFunctionType() && "block of function types only"); 1223 // Unique pointers, to guarantee there is only one block of a particular 1224 // structure. 1225 llvm::FoldingSetNodeID ID; 1226 BlockPointerType::Profile(ID, T); 1227 1228 void *InsertPos = 0; 1229 if (BlockPointerType *PT = 1230 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1231 return QualType(PT, 0); 1232 1233 // If the block pointee type isn't canonical, this won't be a canonical 1234 // type either so fill in the canonical type field. 1235 QualType Canonical; 1236 if (!T.isCanonical()) { 1237 Canonical = getBlockPointerType(getCanonicalType(T)); 1238 1239 // Get the new insert position for the node we care about. 1240 BlockPointerType *NewIP = 1241 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1242 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1243 } 1244 BlockPointerType *New 1245 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1246 Types.push_back(New); 1247 BlockPointerTypes.InsertNode(New, InsertPos); 1248 return QualType(New, 0); 1249} 1250 1251/// getLValueReferenceType - Return the uniqued reference to the type for an 1252/// lvalue reference to the specified type. 1253QualType ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) { 1254 // Unique pointers, to guarantee there is only one pointer of a particular 1255 // structure. 1256 llvm::FoldingSetNodeID ID; 1257 ReferenceType::Profile(ID, T, SpelledAsLValue); 1258 1259 void *InsertPos = 0; 1260 if (LValueReferenceType *RT = 1261 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1262 return QualType(RT, 0); 1263 1264 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1265 1266 // If the referencee type isn't canonical, this won't be a canonical type 1267 // either, so fill in the canonical type field. 1268 QualType Canonical; 1269 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1270 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1271 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1272 1273 // Get the new insert position for the node we care about. 1274 LValueReferenceType *NewIP = 1275 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1276 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1277 } 1278 1279 LValueReferenceType *New 1280 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1281 SpelledAsLValue); 1282 Types.push_back(New); 1283 LValueReferenceTypes.InsertNode(New, InsertPos); 1284 1285 return QualType(New, 0); 1286} 1287 1288/// getRValueReferenceType - Return the uniqued reference to the type for an 1289/// rvalue reference to the specified type. 1290QualType ASTContext::getRValueReferenceType(QualType T) { 1291 // Unique pointers, to guarantee there is only one pointer of a particular 1292 // structure. 1293 llvm::FoldingSetNodeID ID; 1294 ReferenceType::Profile(ID, T, false); 1295 1296 void *InsertPos = 0; 1297 if (RValueReferenceType *RT = 1298 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1299 return QualType(RT, 0); 1300 1301 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1302 1303 // If the referencee type isn't canonical, this won't be a canonical type 1304 // either, so fill in the canonical type field. 1305 QualType Canonical; 1306 if (InnerRef || !T.isCanonical()) { 1307 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1308 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1309 1310 // Get the new insert position for the node we care about. 1311 RValueReferenceType *NewIP = 1312 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1313 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1314 } 1315 1316 RValueReferenceType *New 1317 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1318 Types.push_back(New); 1319 RValueReferenceTypes.InsertNode(New, InsertPos); 1320 return QualType(New, 0); 1321} 1322 1323/// getMemberPointerType - Return the uniqued reference to the type for a 1324/// member pointer to the specified type, in the specified class. 1325QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1326 // Unique pointers, to guarantee there is only one pointer of a particular 1327 // structure. 1328 llvm::FoldingSetNodeID ID; 1329 MemberPointerType::Profile(ID, T, Cls); 1330 1331 void *InsertPos = 0; 1332 if (MemberPointerType *PT = 1333 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1334 return QualType(PT, 0); 1335 1336 // If the pointee or class type isn't canonical, this won't be a canonical 1337 // type either, so fill in the canonical type field. 1338 QualType Canonical; 1339 if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) { 1340 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1341 1342 // Get the new insert position for the node we care about. 1343 MemberPointerType *NewIP = 1344 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1345 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1346 } 1347 MemberPointerType *New 1348 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1349 Types.push_back(New); 1350 MemberPointerTypes.InsertNode(New, InsertPos); 1351 return QualType(New, 0); 1352} 1353 1354/// getConstantArrayType - Return the unique reference to the type for an 1355/// array of the specified element type. 1356QualType ASTContext::getConstantArrayType(QualType EltTy, 1357 const llvm::APInt &ArySizeIn, 1358 ArrayType::ArraySizeModifier ASM, 1359 unsigned EltTypeQuals) { 1360 assert((EltTy->isDependentType() || 1361 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1362 "Constant array of VLAs is illegal!"); 1363 1364 // Convert the array size into a canonical width matching the pointer size for 1365 // the target. 1366 llvm::APInt ArySize(ArySizeIn); 1367 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1368 1369 llvm::FoldingSetNodeID ID; 1370 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1371 1372 void *InsertPos = 0; 1373 if (ConstantArrayType *ATP = 1374 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1375 return QualType(ATP, 0); 1376 1377 // If the element type isn't canonical, this won't be a canonical type either, 1378 // so fill in the canonical type field. 1379 QualType Canonical; 1380 if (!EltTy.isCanonical()) { 1381 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1382 ASM, EltTypeQuals); 1383 // Get the new insert position for the node we care about. 1384 ConstantArrayType *NewIP = 1385 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1386 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1387 } 1388 1389 ConstantArrayType *New = new(*this,TypeAlignment) 1390 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1391 ConstantArrayTypes.InsertNode(New, InsertPos); 1392 Types.push_back(New); 1393 return QualType(New, 0); 1394} 1395 1396/// getVariableArrayType - Returns a non-unique reference to the type for a 1397/// variable array of the specified element type. 1398QualType ASTContext::getVariableArrayType(QualType EltTy, 1399 Expr *NumElts, 1400 ArrayType::ArraySizeModifier ASM, 1401 unsigned EltTypeQuals, 1402 SourceRange Brackets) { 1403 // Since we don't unique expressions, it isn't possible to unique VLA's 1404 // that have an expression provided for their size. 1405 1406 VariableArrayType *New = new(*this, TypeAlignment) 1407 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1408 1409 VariableArrayTypes.push_back(New); 1410 Types.push_back(New); 1411 return QualType(New, 0); 1412} 1413 1414/// getDependentSizedArrayType - Returns a non-unique reference to 1415/// the type for a dependently-sized array of the specified element 1416/// type. 1417QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1418 Expr *NumElts, 1419 ArrayType::ArraySizeModifier ASM, 1420 unsigned EltTypeQuals, 1421 SourceRange Brackets) { 1422 assert((!NumElts || NumElts->isTypeDependent() || 1423 NumElts->isValueDependent()) && 1424 "Size must be type- or value-dependent!"); 1425 1426 void *InsertPos = 0; 1427 DependentSizedArrayType *Canon = 0; 1428 llvm::FoldingSetNodeID ID; 1429 1430 if (NumElts) { 1431 // Dependently-sized array types that do not have a specified 1432 // number of elements will have their sizes deduced from an 1433 // initializer. 1434 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1435 EltTypeQuals, NumElts); 1436 1437 Canon = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1438 } 1439 1440 DependentSizedArrayType *New; 1441 if (Canon) { 1442 // We already have a canonical version of this array type; use it as 1443 // the canonical type for a newly-built type. 1444 New = new (*this, TypeAlignment) 1445 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1446 NumElts, ASM, EltTypeQuals, Brackets); 1447 } else { 1448 QualType CanonEltTy = getCanonicalType(EltTy); 1449 if (CanonEltTy == EltTy) { 1450 New = new (*this, TypeAlignment) 1451 DependentSizedArrayType(*this, EltTy, QualType(), 1452 NumElts, ASM, EltTypeQuals, Brackets); 1453 1454 if (NumElts) { 1455 DependentSizedArrayType *CanonCheck 1456 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1457 assert(!CanonCheck && "Dependent-sized canonical array type broken"); 1458 (void)CanonCheck; 1459 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1460 } 1461 } else { 1462 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1463 ASM, EltTypeQuals, 1464 SourceRange()); 1465 New = new (*this, TypeAlignment) 1466 DependentSizedArrayType(*this, EltTy, Canon, 1467 NumElts, ASM, EltTypeQuals, Brackets); 1468 } 1469 } 1470 1471 Types.push_back(New); 1472 return QualType(New, 0); 1473} 1474 1475QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1476 ArrayType::ArraySizeModifier ASM, 1477 unsigned EltTypeQuals) { 1478 llvm::FoldingSetNodeID ID; 1479 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1480 1481 void *InsertPos = 0; 1482 if (IncompleteArrayType *ATP = 1483 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1484 return QualType(ATP, 0); 1485 1486 // If the element type isn't canonical, this won't be a canonical type 1487 // either, so fill in the canonical type field. 1488 QualType Canonical; 1489 1490 if (!EltTy.isCanonical()) { 1491 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1492 ASM, EltTypeQuals); 1493 1494 // Get the new insert position for the node we care about. 1495 IncompleteArrayType *NewIP = 1496 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1497 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1498 } 1499 1500 IncompleteArrayType *New = new (*this, TypeAlignment) 1501 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1502 1503 IncompleteArrayTypes.InsertNode(New, InsertPos); 1504 Types.push_back(New); 1505 return QualType(New, 0); 1506} 1507 1508/// getVectorType - Return the unique reference to a vector type of 1509/// the specified element type and size. VectorType must be a built-in type. 1510QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts, 1511 bool IsAltiVec, bool IsPixel) { 1512 BuiltinType *baseType; 1513 1514 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1515 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1516 1517 // Check if we've already instantiated a vector of this type. 1518 llvm::FoldingSetNodeID ID; 1519 VectorType::Profile(ID, vecType, NumElts, Type::Vector, 1520 IsAltiVec, IsPixel); 1521 void *InsertPos = 0; 1522 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1523 return QualType(VTP, 0); 1524 1525 // If the element type isn't canonical, this won't be a canonical type either, 1526 // so fill in the canonical type field. 1527 QualType Canonical; 1528 if (!vecType.isCanonical() || IsAltiVec || IsPixel) { 1529 Canonical = getVectorType(getCanonicalType(vecType), 1530 NumElts, false, false); 1531 1532 // Get the new insert position for the node we care about. 1533 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1534 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1535 } 1536 VectorType *New = new (*this, TypeAlignment) 1537 VectorType(vecType, NumElts, Canonical, IsAltiVec, IsPixel); 1538 VectorTypes.InsertNode(New, InsertPos); 1539 Types.push_back(New); 1540 return QualType(New, 0); 1541} 1542 1543/// getExtVectorType - Return the unique reference to an extended vector type of 1544/// the specified element type and size. VectorType must be a built-in type. 1545QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1546 BuiltinType *baseType; 1547 1548 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1549 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1550 1551 // Check if we've already instantiated a vector of this type. 1552 llvm::FoldingSetNodeID ID; 1553 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector, false, false); 1554 void *InsertPos = 0; 1555 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1556 return QualType(VTP, 0); 1557 1558 // If the element type isn't canonical, this won't be a canonical type either, 1559 // so fill in the canonical type field. 1560 QualType Canonical; 1561 if (!vecType.isCanonical()) { 1562 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1563 1564 // Get the new insert position for the node we care about. 1565 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1566 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1567 } 1568 ExtVectorType *New = new (*this, TypeAlignment) 1569 ExtVectorType(vecType, NumElts, Canonical); 1570 VectorTypes.InsertNode(New, InsertPos); 1571 Types.push_back(New); 1572 return QualType(New, 0); 1573} 1574 1575QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1576 Expr *SizeExpr, 1577 SourceLocation AttrLoc) { 1578 llvm::FoldingSetNodeID ID; 1579 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1580 SizeExpr); 1581 1582 void *InsertPos = 0; 1583 DependentSizedExtVectorType *Canon 1584 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1585 DependentSizedExtVectorType *New; 1586 if (Canon) { 1587 // We already have a canonical version of this array type; use it as 1588 // the canonical type for a newly-built type. 1589 New = new (*this, TypeAlignment) 1590 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1591 SizeExpr, AttrLoc); 1592 } else { 1593 QualType CanonVecTy = getCanonicalType(vecType); 1594 if (CanonVecTy == vecType) { 1595 New = new (*this, TypeAlignment) 1596 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1597 AttrLoc); 1598 1599 DependentSizedExtVectorType *CanonCheck 1600 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1601 assert(!CanonCheck && "Dependent-sized ext_vector canonical type broken"); 1602 (void)CanonCheck; 1603 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1604 } else { 1605 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1606 SourceLocation()); 1607 New = new (*this, TypeAlignment) 1608 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1609 } 1610 } 1611 1612 Types.push_back(New); 1613 return QualType(New, 0); 1614} 1615 1616/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1617/// 1618QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, 1619 const FunctionType::ExtInfo &Info) { 1620 const CallingConv CallConv = Info.getCC(); 1621 // Unique functions, to guarantee there is only one function of a particular 1622 // structure. 1623 llvm::FoldingSetNodeID ID; 1624 FunctionNoProtoType::Profile(ID, ResultTy, Info); 1625 1626 void *InsertPos = 0; 1627 if (FunctionNoProtoType *FT = 1628 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1629 return QualType(FT, 0); 1630 1631 QualType Canonical; 1632 if (!ResultTy.isCanonical() || 1633 getCanonicalCallConv(CallConv) != CallConv) { 1634 Canonical = 1635 getFunctionNoProtoType(getCanonicalType(ResultTy), 1636 Info.withCallingConv(getCanonicalCallConv(CallConv))); 1637 1638 // Get the new insert position for the node we care about. 1639 FunctionNoProtoType *NewIP = 1640 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1641 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1642 } 1643 1644 FunctionNoProtoType *New = new (*this, TypeAlignment) 1645 FunctionNoProtoType(ResultTy, Canonical, Info); 1646 Types.push_back(New); 1647 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1648 return QualType(New, 0); 1649} 1650 1651/// getFunctionType - Return a normal function type with a typed argument 1652/// list. isVariadic indicates whether the argument list includes '...'. 1653QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1654 unsigned NumArgs, bool isVariadic, 1655 unsigned TypeQuals, bool hasExceptionSpec, 1656 bool hasAnyExceptionSpec, unsigned NumExs, 1657 const QualType *ExArray, 1658 const FunctionType::ExtInfo &Info) { 1659 const CallingConv CallConv= Info.getCC(); 1660 // Unique functions, to guarantee there is only one function of a particular 1661 // structure. 1662 llvm::FoldingSetNodeID ID; 1663 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1664 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1665 NumExs, ExArray, Info); 1666 1667 void *InsertPos = 0; 1668 if (FunctionProtoType *FTP = 1669 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1670 return QualType(FTP, 0); 1671 1672 // Determine whether the type being created is already canonical or not. 1673 bool isCanonical = !hasExceptionSpec && ResultTy.isCanonical(); 1674 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1675 if (!ArgArray[i].isCanonicalAsParam()) 1676 isCanonical = false; 1677 1678 // If this type isn't canonical, get the canonical version of it. 1679 // The exception spec is not part of the canonical type. 1680 QualType Canonical; 1681 if (!isCanonical || getCanonicalCallConv(CallConv) != CallConv) { 1682 llvm::SmallVector<QualType, 16> CanonicalArgs; 1683 CanonicalArgs.reserve(NumArgs); 1684 for (unsigned i = 0; i != NumArgs; ++i) 1685 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1686 1687 Canonical = getFunctionType(getCanonicalType(ResultTy), 1688 CanonicalArgs.data(), NumArgs, 1689 isVariadic, TypeQuals, false, 1690 false, 0, 0, 1691 Info.withCallingConv(getCanonicalCallConv(CallConv))); 1692 1693 // Get the new insert position for the node we care about. 1694 FunctionProtoType *NewIP = 1695 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1696 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1697 } 1698 1699 // FunctionProtoType objects are allocated with extra bytes after them 1700 // for two variable size arrays (for parameter and exception types) at the 1701 // end of them. 1702 FunctionProtoType *FTP = 1703 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1704 NumArgs*sizeof(QualType) + 1705 NumExs*sizeof(QualType), TypeAlignment); 1706 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1707 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1708 ExArray, NumExs, Canonical, Info); 1709 Types.push_back(FTP); 1710 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1711 return QualType(FTP, 0); 1712} 1713 1714#ifndef NDEBUG 1715static bool NeedsInjectedClassNameType(const RecordDecl *D) { 1716 if (!isa<CXXRecordDecl>(D)) return false; 1717 const CXXRecordDecl *RD = cast<CXXRecordDecl>(D); 1718 if (isa<ClassTemplatePartialSpecializationDecl>(RD)) 1719 return true; 1720 if (RD->getDescribedClassTemplate() && 1721 !isa<ClassTemplateSpecializationDecl>(RD)) 1722 return true; 1723 return false; 1724} 1725#endif 1726 1727/// getInjectedClassNameType - Return the unique reference to the 1728/// injected class name type for the specified templated declaration. 1729QualType ASTContext::getInjectedClassNameType(CXXRecordDecl *Decl, 1730 QualType TST) { 1731 assert(NeedsInjectedClassNameType(Decl)); 1732 if (Decl->TypeForDecl) { 1733 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1734 } else if (CXXRecordDecl *PrevDecl 1735 = cast_or_null<CXXRecordDecl>(Decl->getPreviousDeclaration())) { 1736 assert(PrevDecl->TypeForDecl && "previous declaration has no type"); 1737 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1738 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1739 } else { 1740 Decl->TypeForDecl = 1741 new (*this, TypeAlignment) InjectedClassNameType(Decl, TST); 1742 Types.push_back(Decl->TypeForDecl); 1743 } 1744 return QualType(Decl->TypeForDecl, 0); 1745} 1746 1747/// getTypeDeclType - Return the unique reference to the type for the 1748/// specified type declaration. 1749QualType ASTContext::getTypeDeclTypeSlow(const TypeDecl *Decl) { 1750 assert(Decl && "Passed null for Decl param"); 1751 assert(!Decl->TypeForDecl && "TypeForDecl present in slow case"); 1752 1753 if (const TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1754 return getTypedefType(Typedef); 1755 1756 if (const ObjCInterfaceDecl *ObjCInterface 1757 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1758 return getObjCInterfaceType(ObjCInterface); 1759 1760 assert(!isa<TemplateTypeParmDecl>(Decl) && 1761 "Template type parameter types are always available."); 1762 1763 if (const RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1764 assert(!Record->getPreviousDeclaration() && 1765 "struct/union has previous declaration"); 1766 assert(!NeedsInjectedClassNameType(Record)); 1767 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1768 } else if (const EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1769 assert(!Enum->getPreviousDeclaration() && 1770 "enum has previous declaration"); 1771 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1772 } else if (const UnresolvedUsingTypenameDecl *Using = 1773 dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) { 1774 Decl->TypeForDecl = new (*this, TypeAlignment) UnresolvedUsingType(Using); 1775 } else 1776 llvm_unreachable("TypeDecl without a type?"); 1777 1778 Types.push_back(Decl->TypeForDecl); 1779 return QualType(Decl->TypeForDecl, 0); 1780} 1781 1782/// getTypedefType - Return the unique reference to the type for the 1783/// specified typename decl. 1784QualType ASTContext::getTypedefType(const TypedefDecl *Decl) { 1785 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1786 1787 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1788 Decl->TypeForDecl = new(*this, TypeAlignment) 1789 TypedefType(Type::Typedef, Decl, Canonical); 1790 Types.push_back(Decl->TypeForDecl); 1791 return QualType(Decl->TypeForDecl, 0); 1792} 1793 1794/// \brief Retrieve a substitution-result type. 1795QualType 1796ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1797 QualType Replacement) { 1798 assert(Replacement.isCanonical() 1799 && "replacement types must always be canonical"); 1800 1801 llvm::FoldingSetNodeID ID; 1802 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1803 void *InsertPos = 0; 1804 SubstTemplateTypeParmType *SubstParm 1805 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1806 1807 if (!SubstParm) { 1808 SubstParm = new (*this, TypeAlignment) 1809 SubstTemplateTypeParmType(Parm, Replacement); 1810 Types.push_back(SubstParm); 1811 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1812 } 1813 1814 return QualType(SubstParm, 0); 1815} 1816 1817/// \brief Retrieve the template type parameter type for a template 1818/// parameter or parameter pack with the given depth, index, and (optionally) 1819/// name. 1820QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1821 bool ParameterPack, 1822 IdentifierInfo *Name) { 1823 llvm::FoldingSetNodeID ID; 1824 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1825 void *InsertPos = 0; 1826 TemplateTypeParmType *TypeParm 1827 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1828 1829 if (TypeParm) 1830 return QualType(TypeParm, 0); 1831 1832 if (Name) { 1833 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1834 TypeParm = new (*this, TypeAlignment) 1835 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1836 1837 TemplateTypeParmType *TypeCheck 1838 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1839 assert(!TypeCheck && "Template type parameter canonical type broken"); 1840 (void)TypeCheck; 1841 } else 1842 TypeParm = new (*this, TypeAlignment) 1843 TemplateTypeParmType(Depth, Index, ParameterPack); 1844 1845 Types.push_back(TypeParm); 1846 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1847 1848 return QualType(TypeParm, 0); 1849} 1850 1851TypeSourceInfo * 1852ASTContext::getTemplateSpecializationTypeInfo(TemplateName Name, 1853 SourceLocation NameLoc, 1854 const TemplateArgumentListInfo &Args, 1855 QualType CanonType) { 1856 QualType TST = getTemplateSpecializationType(Name, Args, CanonType); 1857 1858 TypeSourceInfo *DI = CreateTypeSourceInfo(TST); 1859 TemplateSpecializationTypeLoc TL 1860 = cast<TemplateSpecializationTypeLoc>(DI->getTypeLoc()); 1861 TL.setTemplateNameLoc(NameLoc); 1862 TL.setLAngleLoc(Args.getLAngleLoc()); 1863 TL.setRAngleLoc(Args.getRAngleLoc()); 1864 for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i) 1865 TL.setArgLocInfo(i, Args[i].getLocInfo()); 1866 return DI; 1867} 1868 1869QualType 1870ASTContext::getTemplateSpecializationType(TemplateName Template, 1871 const TemplateArgumentListInfo &Args, 1872 QualType Canon, 1873 bool IsCurrentInstantiation) { 1874 unsigned NumArgs = Args.size(); 1875 1876 llvm::SmallVector<TemplateArgument, 4> ArgVec; 1877 ArgVec.reserve(NumArgs); 1878 for (unsigned i = 0; i != NumArgs; ++i) 1879 ArgVec.push_back(Args[i].getArgument()); 1880 1881 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, 1882 Canon, IsCurrentInstantiation); 1883} 1884 1885QualType 1886ASTContext::getTemplateSpecializationType(TemplateName Template, 1887 const TemplateArgument *Args, 1888 unsigned NumArgs, 1889 QualType Canon, 1890 bool IsCurrentInstantiation) { 1891 if (!Canon.isNull()) 1892 Canon = getCanonicalType(Canon); 1893 else { 1894 assert(!IsCurrentInstantiation && 1895 "current-instantiation specializations should always " 1896 "have a canonical type"); 1897 1898 // Build the canonical template specialization type. 1899 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1900 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1901 CanonArgs.reserve(NumArgs); 1902 for (unsigned I = 0; I != NumArgs; ++I) 1903 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1904 1905 // Determine whether this canonical template specialization type already 1906 // exists. 1907 llvm::FoldingSetNodeID ID; 1908 TemplateSpecializationType::Profile(ID, CanonTemplate, false, 1909 CanonArgs.data(), NumArgs, *this); 1910 1911 void *InsertPos = 0; 1912 TemplateSpecializationType *Spec 1913 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1914 1915 if (!Spec) { 1916 // Allocate a new canonical template specialization type. 1917 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1918 sizeof(TemplateArgument) * NumArgs), 1919 TypeAlignment); 1920 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, false, 1921 CanonArgs.data(), NumArgs, 1922 Canon); 1923 Types.push_back(Spec); 1924 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1925 } 1926 1927 if (Canon.isNull()) 1928 Canon = QualType(Spec, 0); 1929 assert(Canon->isDependentType() && 1930 "Non-dependent template-id type must have a canonical type"); 1931 } 1932 1933 // Allocate the (non-canonical) template specialization type, but don't 1934 // try to unique it: these types typically have location information that 1935 // we don't unique and don't want to lose. 1936 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1937 sizeof(TemplateArgument) * NumArgs), 1938 TypeAlignment); 1939 TemplateSpecializationType *Spec 1940 = new (Mem) TemplateSpecializationType(*this, Template, 1941 IsCurrentInstantiation, 1942 Args, NumArgs, 1943 Canon); 1944 1945 Types.push_back(Spec); 1946 return QualType(Spec, 0); 1947} 1948 1949QualType 1950ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1951 QualType NamedType) { 1952 llvm::FoldingSetNodeID ID; 1953 QualifiedNameType::Profile(ID, NNS, NamedType); 1954 1955 void *InsertPos = 0; 1956 QualifiedNameType *T 1957 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1958 if (T) 1959 return QualType(T, 0); 1960 1961 QualType Canon = NamedType; 1962 if (!Canon.isCanonical()) { 1963 Canon = getCanonicalType(NamedType); 1964 QualifiedNameType *CheckT 1965 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1966 assert(!CheckT && "Qualified name canonical type broken"); 1967 (void)CheckT; 1968 } 1969 1970 T = new (*this) QualifiedNameType(NNS, NamedType, Canon); 1971 Types.push_back(T); 1972 QualifiedNameTypes.InsertNode(T, InsertPos); 1973 return QualType(T, 0); 1974} 1975 1976QualType ASTContext::getDependentNameType(ElaboratedTypeKeyword Keyword, 1977 NestedNameSpecifier *NNS, 1978 const IdentifierInfo *Name, 1979 QualType Canon) { 1980 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1981 1982 if (Canon.isNull()) { 1983 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1984 ElaboratedTypeKeyword CanonKeyword = Keyword; 1985 if (Keyword == ETK_None) 1986 CanonKeyword = ETK_Typename; 1987 1988 if (CanonNNS != NNS || CanonKeyword != Keyword) 1989 Canon = getDependentNameType(CanonKeyword, CanonNNS, Name); 1990 } 1991 1992 llvm::FoldingSetNodeID ID; 1993 DependentNameType::Profile(ID, Keyword, NNS, Name); 1994 1995 void *InsertPos = 0; 1996 DependentNameType *T 1997 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1998 if (T) 1999 return QualType(T, 0); 2000 2001 T = new (*this) DependentNameType(Keyword, NNS, Name, Canon); 2002 Types.push_back(T); 2003 DependentNameTypes.InsertNode(T, InsertPos); 2004 return QualType(T, 0); 2005} 2006 2007QualType 2008ASTContext::getDependentNameType(ElaboratedTypeKeyword Keyword, 2009 NestedNameSpecifier *NNS, 2010 const TemplateSpecializationType *TemplateId, 2011 QualType Canon) { 2012 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 2013 2014 llvm::FoldingSetNodeID ID; 2015 DependentNameType::Profile(ID, Keyword, NNS, TemplateId); 2016 2017 void *InsertPos = 0; 2018 DependentNameType *T 2019 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 2020 if (T) 2021 return QualType(T, 0); 2022 2023 if (Canon.isNull()) { 2024 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2025 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 2026 ElaboratedTypeKeyword CanonKeyword = Keyword; 2027 if (Keyword == ETK_None) 2028 CanonKeyword = ETK_Typename; 2029 if (CanonNNS != NNS || CanonKeyword != Keyword || 2030 CanonType != QualType(TemplateId, 0)) { 2031 const TemplateSpecializationType *CanonTemplateId 2032 = CanonType->getAs<TemplateSpecializationType>(); 2033 assert(CanonTemplateId && 2034 "Canonical type must also be a template specialization type"); 2035 Canon = getDependentNameType(CanonKeyword, CanonNNS, CanonTemplateId); 2036 } 2037 2038 DependentNameType *CheckT 2039 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 2040 assert(!CheckT && "Typename canonical type is broken"); (void)CheckT; 2041 } 2042 2043 T = new (*this) DependentNameType(Keyword, NNS, TemplateId, Canon); 2044 Types.push_back(T); 2045 DependentNameTypes.InsertNode(T, InsertPos); 2046 return QualType(T, 0); 2047} 2048 2049QualType 2050ASTContext::getElaboratedType(QualType UnderlyingType, 2051 ElaboratedType::TagKind Tag) { 2052 llvm::FoldingSetNodeID ID; 2053 ElaboratedType::Profile(ID, UnderlyingType, Tag); 2054 2055 void *InsertPos = 0; 2056 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2057 if (T) 2058 return QualType(T, 0); 2059 2060 QualType Canon = UnderlyingType; 2061 if (!Canon.isCanonical()) { 2062 Canon = getCanonicalType(Canon); 2063 ElaboratedType *CheckT = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2064 assert(!CheckT && "Elaborated canonical type is broken"); (void)CheckT; 2065 } 2066 2067 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 2068 Types.push_back(T); 2069 ElaboratedTypes.InsertNode(T, InsertPos); 2070 return QualType(T, 0); 2071} 2072 2073/// CmpProtocolNames - Comparison predicate for sorting protocols 2074/// alphabetically. 2075static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 2076 const ObjCProtocolDecl *RHS) { 2077 return LHS->getDeclName() < RHS->getDeclName(); 2078} 2079 2080static bool areSortedAndUniqued(ObjCProtocolDecl **Protocols, 2081 unsigned NumProtocols) { 2082 if (NumProtocols == 0) return true; 2083 2084 for (unsigned i = 1; i != NumProtocols; ++i) 2085 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 2086 return false; 2087 return true; 2088} 2089 2090static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2091 unsigned &NumProtocols) { 2092 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2093 2094 // Sort protocols, keyed by name. 2095 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2096 2097 // Remove duplicates. 2098 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2099 NumProtocols = ProtocolsEnd-Protocols; 2100} 2101 2102/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2103/// the given interface decl and the conforming protocol list. 2104QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 2105 ObjCProtocolDecl **Protocols, 2106 unsigned NumProtocols, 2107 unsigned Quals) { 2108 llvm::FoldingSetNodeID ID; 2109 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 2110 Qualifiers Qs = Qualifiers::fromCVRMask(Quals); 2111 2112 void *InsertPos = 0; 2113 if (ObjCObjectPointerType *QT = 2114 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2115 return getQualifiedType(QualType(QT, 0), Qs); 2116 2117 // Sort the protocol list alphabetically to canonicalize it. 2118 QualType Canonical; 2119 if (!InterfaceT.isCanonical() || 2120 !areSortedAndUniqued(Protocols, NumProtocols)) { 2121 if (!areSortedAndUniqued(Protocols, NumProtocols)) { 2122 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2123 unsigned UniqueCount = NumProtocols; 2124 2125 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2126 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2127 2128 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2129 &Sorted[0], UniqueCount); 2130 } else { 2131 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2132 Protocols, NumProtocols); 2133 } 2134 2135 // Regenerate InsertPos. 2136 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2137 } 2138 2139 // No match. 2140 unsigned Size = sizeof(ObjCObjectPointerType) 2141 + NumProtocols * sizeof(ObjCProtocolDecl *); 2142 void *Mem = Allocate(Size, TypeAlignment); 2143 ObjCObjectPointerType *QType = new (Mem) ObjCObjectPointerType(Canonical, 2144 InterfaceT, 2145 Protocols, 2146 NumProtocols); 2147 2148 Types.push_back(QType); 2149 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2150 return getQualifiedType(QualType(QType, 0), Qs); 2151} 2152 2153/// getObjCInterfaceType - Return the unique reference to the type for the 2154/// specified ObjC interface decl. The list of protocols is optional. 2155QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 2156 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 2157 llvm::FoldingSetNodeID ID; 2158 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 2159 2160 void *InsertPos = 0; 2161 if (ObjCInterfaceType *QT = 2162 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 2163 return QualType(QT, 0); 2164 2165 // Sort the protocol list alphabetically to canonicalize it. 2166 QualType Canonical; 2167 if (NumProtocols && !areSortedAndUniqued(Protocols, NumProtocols)) { 2168 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2169 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2170 2171 unsigned UniqueCount = NumProtocols; 2172 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2173 2174 Canonical = getObjCInterfaceType(Decl, &Sorted[0], UniqueCount); 2175 2176 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos); 2177 } 2178 2179 unsigned Size = sizeof(ObjCInterfaceType) 2180 + NumProtocols * sizeof(ObjCProtocolDecl *); 2181 void *Mem = Allocate(Size, TypeAlignment); 2182 ObjCInterfaceType *QType = new (Mem) ObjCInterfaceType(Canonical, 2183 const_cast<ObjCInterfaceDecl*>(Decl), 2184 Protocols, 2185 NumProtocols); 2186 2187 Types.push_back(QType); 2188 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 2189 return QualType(QType, 0); 2190} 2191 2192/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2193/// TypeOfExprType AST's (since expression's are never shared). For example, 2194/// multiple declarations that refer to "typeof(x)" all contain different 2195/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2196/// on canonical type's (which are always unique). 2197QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2198 TypeOfExprType *toe; 2199 if (tofExpr->isTypeDependent()) { 2200 llvm::FoldingSetNodeID ID; 2201 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2202 2203 void *InsertPos = 0; 2204 DependentTypeOfExprType *Canon 2205 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2206 if (Canon) { 2207 // We already have a "canonical" version of an identical, dependent 2208 // typeof(expr) type. Use that as our canonical type. 2209 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2210 QualType((TypeOfExprType*)Canon, 0)); 2211 } 2212 else { 2213 // Build a new, canonical typeof(expr) type. 2214 Canon 2215 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2216 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2217 toe = Canon; 2218 } 2219 } else { 2220 QualType Canonical = getCanonicalType(tofExpr->getType()); 2221 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2222 } 2223 Types.push_back(toe); 2224 return QualType(toe, 0); 2225} 2226 2227/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2228/// TypeOfType AST's. The only motivation to unique these nodes would be 2229/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2230/// an issue. This doesn't effect the type checker, since it operates 2231/// on canonical type's (which are always unique). 2232QualType ASTContext::getTypeOfType(QualType tofType) { 2233 QualType Canonical = getCanonicalType(tofType); 2234 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2235 Types.push_back(tot); 2236 return QualType(tot, 0); 2237} 2238 2239/// getDecltypeForExpr - Given an expr, will return the decltype for that 2240/// expression, according to the rules in C++0x [dcl.type.simple]p4 2241static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2242 if (e->isTypeDependent()) 2243 return Context.DependentTy; 2244 2245 // If e is an id expression or a class member access, decltype(e) is defined 2246 // as the type of the entity named by e. 2247 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2248 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2249 return VD->getType(); 2250 } 2251 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2252 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2253 return FD->getType(); 2254 } 2255 // If e is a function call or an invocation of an overloaded operator, 2256 // (parentheses around e are ignored), decltype(e) is defined as the 2257 // return type of that function. 2258 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2259 return CE->getCallReturnType(); 2260 2261 QualType T = e->getType(); 2262 2263 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2264 // defined as T&, otherwise decltype(e) is defined as T. 2265 if (e->isLvalue(Context) == Expr::LV_Valid) 2266 T = Context.getLValueReferenceType(T); 2267 2268 return T; 2269} 2270 2271/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2272/// DecltypeType AST's. The only motivation to unique these nodes would be 2273/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2274/// an issue. This doesn't effect the type checker, since it operates 2275/// on canonical type's (which are always unique). 2276QualType ASTContext::getDecltypeType(Expr *e) { 2277 DecltypeType *dt; 2278 if (e->isTypeDependent()) { 2279 llvm::FoldingSetNodeID ID; 2280 DependentDecltypeType::Profile(ID, *this, e); 2281 2282 void *InsertPos = 0; 2283 DependentDecltypeType *Canon 2284 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2285 if (Canon) { 2286 // We already have a "canonical" version of an equivalent, dependent 2287 // decltype type. Use that as our canonical type. 2288 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2289 QualType((DecltypeType*)Canon, 0)); 2290 } 2291 else { 2292 // Build a new, canonical typeof(expr) type. 2293 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2294 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2295 dt = Canon; 2296 } 2297 } else { 2298 QualType T = getDecltypeForExpr(e, *this); 2299 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2300 } 2301 Types.push_back(dt); 2302 return QualType(dt, 0); 2303} 2304 2305/// getTagDeclType - Return the unique reference to the type for the 2306/// specified TagDecl (struct/union/class/enum) decl. 2307QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2308 assert (Decl); 2309 // FIXME: What is the design on getTagDeclType when it requires casting 2310 // away const? mutable? 2311 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2312} 2313 2314/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2315/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2316/// needs to agree with the definition in <stddef.h>. 2317CanQualType ASTContext::getSizeType() const { 2318 return getFromTargetType(Target.getSizeType()); 2319} 2320 2321/// getSignedWCharType - Return the type of "signed wchar_t". 2322/// Used when in C++, as a GCC extension. 2323QualType ASTContext::getSignedWCharType() const { 2324 // FIXME: derive from "Target" ? 2325 return WCharTy; 2326} 2327 2328/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2329/// Used when in C++, as a GCC extension. 2330QualType ASTContext::getUnsignedWCharType() const { 2331 // FIXME: derive from "Target" ? 2332 return UnsignedIntTy; 2333} 2334 2335/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2336/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2337QualType ASTContext::getPointerDiffType() const { 2338 return getFromTargetType(Target.getPtrDiffType(0)); 2339} 2340 2341//===----------------------------------------------------------------------===// 2342// Type Operators 2343//===----------------------------------------------------------------------===// 2344 2345CanQualType ASTContext::getCanonicalParamType(QualType T) { 2346 // Push qualifiers into arrays, and then discard any remaining 2347 // qualifiers. 2348 T = getCanonicalType(T); 2349 const Type *Ty = T.getTypePtr(); 2350 2351 QualType Result; 2352 if (isa<ArrayType>(Ty)) { 2353 Result = getArrayDecayedType(QualType(Ty,0)); 2354 } else if (isa<FunctionType>(Ty)) { 2355 Result = getPointerType(QualType(Ty, 0)); 2356 } else { 2357 Result = QualType(Ty, 0); 2358 } 2359 2360 return CanQualType::CreateUnsafe(Result); 2361} 2362 2363/// getCanonicalType - Return the canonical (structural) type corresponding to 2364/// the specified potentially non-canonical type. The non-canonical version 2365/// of a type may have many "decorated" versions of types. Decorators can 2366/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2367/// to be free of any of these, allowing two canonical types to be compared 2368/// for exact equality with a simple pointer comparison. 2369CanQualType ASTContext::getCanonicalType(QualType T) { 2370 QualifierCollector Quals; 2371 const Type *Ptr = Quals.strip(T); 2372 QualType CanType = Ptr->getCanonicalTypeInternal(); 2373 2374 // The canonical internal type will be the canonical type *except* 2375 // that we push type qualifiers down through array types. 2376 2377 // If there are no new qualifiers to push down, stop here. 2378 if (!Quals.hasQualifiers()) 2379 return CanQualType::CreateUnsafe(CanType); 2380 2381 // If the type qualifiers are on an array type, get the canonical 2382 // type of the array with the qualifiers applied to the element 2383 // type. 2384 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2385 if (!AT) 2386 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2387 2388 // Get the canonical version of the element with the extra qualifiers on it. 2389 // This can recursively sink qualifiers through multiple levels of arrays. 2390 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2391 NewEltTy = getCanonicalType(NewEltTy); 2392 2393 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2394 return CanQualType::CreateUnsafe( 2395 getConstantArrayType(NewEltTy, CAT->getSize(), 2396 CAT->getSizeModifier(), 2397 CAT->getIndexTypeCVRQualifiers())); 2398 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2399 return CanQualType::CreateUnsafe( 2400 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2401 IAT->getIndexTypeCVRQualifiers())); 2402 2403 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2404 return CanQualType::CreateUnsafe( 2405 getDependentSizedArrayType(NewEltTy, 2406 DSAT->getSizeExpr() ? 2407 DSAT->getSizeExpr()->Retain() : 0, 2408 DSAT->getSizeModifier(), 2409 DSAT->getIndexTypeCVRQualifiers(), 2410 DSAT->getBracketsRange())->getCanonicalTypeInternal()); 2411 2412 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2413 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2414 VAT->getSizeExpr() ? 2415 VAT->getSizeExpr()->Retain() : 0, 2416 VAT->getSizeModifier(), 2417 VAT->getIndexTypeCVRQualifiers(), 2418 VAT->getBracketsRange())); 2419} 2420 2421QualType ASTContext::getUnqualifiedArrayType(QualType T, 2422 Qualifiers &Quals) { 2423 Quals = T.getQualifiers(); 2424 if (!isa<ArrayType>(T)) { 2425 return T.getUnqualifiedType(); 2426 } 2427 2428 const ArrayType *AT = cast<ArrayType>(T); 2429 QualType Elt = AT->getElementType(); 2430 QualType UnqualElt = getUnqualifiedArrayType(Elt, Quals); 2431 if (Elt == UnqualElt) 2432 return T; 2433 2434 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(T)) { 2435 return getConstantArrayType(UnqualElt, CAT->getSize(), 2436 CAT->getSizeModifier(), 0); 2437 } 2438 2439 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(T)) { 2440 return getIncompleteArrayType(UnqualElt, IAT->getSizeModifier(), 0); 2441 } 2442 2443 const DependentSizedArrayType *DSAT = cast<DependentSizedArrayType>(T); 2444 return getDependentSizedArrayType(UnqualElt, DSAT->getSizeExpr()->Retain(), 2445 DSAT->getSizeModifier(), 0, 2446 SourceRange()); 2447} 2448 2449DeclarationName ASTContext::getNameForTemplate(TemplateName Name) { 2450 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2451 return TD->getDeclName(); 2452 2453 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2454 if (DTN->isIdentifier()) { 2455 return DeclarationNames.getIdentifier(DTN->getIdentifier()); 2456 } else { 2457 return DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2458 } 2459 } 2460 2461 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2462 assert(Storage); 2463 return (*Storage->begin())->getDeclName(); 2464} 2465 2466TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2467 // If this template name refers to a template, the canonical 2468 // template name merely stores the template itself. 2469 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2470 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2471 2472 assert(!Name.getAsOverloadedTemplate()); 2473 2474 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2475 assert(DTN && "Non-dependent template names must refer to template decls."); 2476 return DTN->CanonicalTemplateName; 2477} 2478 2479bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2480 X = getCanonicalTemplateName(X); 2481 Y = getCanonicalTemplateName(Y); 2482 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2483} 2484 2485TemplateArgument 2486ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2487 switch (Arg.getKind()) { 2488 case TemplateArgument::Null: 2489 return Arg; 2490 2491 case TemplateArgument::Expression: 2492 return Arg; 2493 2494 case TemplateArgument::Declaration: 2495 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2496 2497 case TemplateArgument::Template: 2498 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2499 2500 case TemplateArgument::Integral: 2501 return TemplateArgument(*Arg.getAsIntegral(), 2502 getCanonicalType(Arg.getIntegralType())); 2503 2504 case TemplateArgument::Type: 2505 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2506 2507 case TemplateArgument::Pack: { 2508 // FIXME: Allocate in ASTContext 2509 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2510 unsigned Idx = 0; 2511 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2512 AEnd = Arg.pack_end(); 2513 A != AEnd; (void)++A, ++Idx) 2514 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2515 2516 TemplateArgument Result; 2517 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2518 return Result; 2519 } 2520 } 2521 2522 // Silence GCC warning 2523 assert(false && "Unhandled template argument kind"); 2524 return TemplateArgument(); 2525} 2526 2527NestedNameSpecifier * 2528ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2529 if (!NNS) 2530 return 0; 2531 2532 switch (NNS->getKind()) { 2533 case NestedNameSpecifier::Identifier: 2534 // Canonicalize the prefix but keep the identifier the same. 2535 return NestedNameSpecifier::Create(*this, 2536 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2537 NNS->getAsIdentifier()); 2538 2539 case NestedNameSpecifier::Namespace: 2540 // A namespace is canonical; build a nested-name-specifier with 2541 // this namespace and no prefix. 2542 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2543 2544 case NestedNameSpecifier::TypeSpec: 2545 case NestedNameSpecifier::TypeSpecWithTemplate: { 2546 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2547 return NestedNameSpecifier::Create(*this, 0, 2548 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2549 T.getTypePtr()); 2550 } 2551 2552 case NestedNameSpecifier::Global: 2553 // The global specifier is canonical and unique. 2554 return NNS; 2555 } 2556 2557 // Required to silence a GCC warning 2558 return 0; 2559} 2560 2561 2562const ArrayType *ASTContext::getAsArrayType(QualType T) { 2563 // Handle the non-qualified case efficiently. 2564 if (!T.hasLocalQualifiers()) { 2565 // Handle the common positive case fast. 2566 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2567 return AT; 2568 } 2569 2570 // Handle the common negative case fast. 2571 QualType CType = T->getCanonicalTypeInternal(); 2572 if (!isa<ArrayType>(CType)) 2573 return 0; 2574 2575 // Apply any qualifiers from the array type to the element type. This 2576 // implements C99 6.7.3p8: "If the specification of an array type includes 2577 // any type qualifiers, the element type is so qualified, not the array type." 2578 2579 // If we get here, we either have type qualifiers on the type, or we have 2580 // sugar such as a typedef in the way. If we have type qualifiers on the type 2581 // we must propagate them down into the element type. 2582 2583 QualifierCollector Qs; 2584 const Type *Ty = Qs.strip(T.getDesugaredType()); 2585 2586 // If we have a simple case, just return now. 2587 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2588 if (ATy == 0 || Qs.empty()) 2589 return ATy; 2590 2591 // Otherwise, we have an array and we have qualifiers on it. Push the 2592 // qualifiers into the array element type and return a new array type. 2593 // Get the canonical version of the element with the extra qualifiers on it. 2594 // This can recursively sink qualifiers through multiple levels of arrays. 2595 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2596 2597 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2598 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2599 CAT->getSizeModifier(), 2600 CAT->getIndexTypeCVRQualifiers())); 2601 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2602 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2603 IAT->getSizeModifier(), 2604 IAT->getIndexTypeCVRQualifiers())); 2605 2606 if (const DependentSizedArrayType *DSAT 2607 = dyn_cast<DependentSizedArrayType>(ATy)) 2608 return cast<ArrayType>( 2609 getDependentSizedArrayType(NewEltTy, 2610 DSAT->getSizeExpr() ? 2611 DSAT->getSizeExpr()->Retain() : 0, 2612 DSAT->getSizeModifier(), 2613 DSAT->getIndexTypeCVRQualifiers(), 2614 DSAT->getBracketsRange())); 2615 2616 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2617 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2618 VAT->getSizeExpr() ? 2619 VAT->getSizeExpr()->Retain() : 0, 2620 VAT->getSizeModifier(), 2621 VAT->getIndexTypeCVRQualifiers(), 2622 VAT->getBracketsRange())); 2623} 2624 2625 2626/// getArrayDecayedType - Return the properly qualified result of decaying the 2627/// specified array type to a pointer. This operation is non-trivial when 2628/// handling typedefs etc. The canonical type of "T" must be an array type, 2629/// this returns a pointer to a properly qualified element of the array. 2630/// 2631/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2632QualType ASTContext::getArrayDecayedType(QualType Ty) { 2633 // Get the element type with 'getAsArrayType' so that we don't lose any 2634 // typedefs in the element type of the array. This also handles propagation 2635 // of type qualifiers from the array type into the element type if present 2636 // (C99 6.7.3p8). 2637 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2638 assert(PrettyArrayType && "Not an array type!"); 2639 2640 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2641 2642 // int x[restrict 4] -> int *restrict 2643 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2644} 2645 2646QualType ASTContext::getBaseElementType(QualType QT) { 2647 QualifierCollector Qs; 2648 while (true) { 2649 const Type *UT = Qs.strip(QT); 2650 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2651 QT = AT->getElementType(); 2652 } else { 2653 return Qs.apply(QT); 2654 } 2655 } 2656} 2657 2658QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2659 QualType ElemTy = AT->getElementType(); 2660 2661 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2662 return getBaseElementType(AT); 2663 2664 return ElemTy; 2665} 2666 2667/// getConstantArrayElementCount - Returns number of constant array elements. 2668uint64_t 2669ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2670 uint64_t ElementCount = 1; 2671 do { 2672 ElementCount *= CA->getSize().getZExtValue(); 2673 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2674 } while (CA); 2675 return ElementCount; 2676} 2677 2678/// getFloatingRank - Return a relative rank for floating point types. 2679/// This routine will assert if passed a built-in type that isn't a float. 2680static FloatingRank getFloatingRank(QualType T) { 2681 if (const ComplexType *CT = T->getAs<ComplexType>()) 2682 return getFloatingRank(CT->getElementType()); 2683 2684 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2685 switch (T->getAs<BuiltinType>()->getKind()) { 2686 default: assert(0 && "getFloatingRank(): not a floating type"); 2687 case BuiltinType::Float: return FloatRank; 2688 case BuiltinType::Double: return DoubleRank; 2689 case BuiltinType::LongDouble: return LongDoubleRank; 2690 } 2691} 2692 2693/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2694/// point or a complex type (based on typeDomain/typeSize). 2695/// 'typeDomain' is a real floating point or complex type. 2696/// 'typeSize' is a real floating point or complex type. 2697QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2698 QualType Domain) const { 2699 FloatingRank EltRank = getFloatingRank(Size); 2700 if (Domain->isComplexType()) { 2701 switch (EltRank) { 2702 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2703 case FloatRank: return FloatComplexTy; 2704 case DoubleRank: return DoubleComplexTy; 2705 case LongDoubleRank: return LongDoubleComplexTy; 2706 } 2707 } 2708 2709 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2710 switch (EltRank) { 2711 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2712 case FloatRank: return FloatTy; 2713 case DoubleRank: return DoubleTy; 2714 case LongDoubleRank: return LongDoubleTy; 2715 } 2716} 2717 2718/// getFloatingTypeOrder - Compare the rank of the two specified floating 2719/// point types, ignoring the domain of the type (i.e. 'double' == 2720/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2721/// LHS < RHS, return -1. 2722int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2723 FloatingRank LHSR = getFloatingRank(LHS); 2724 FloatingRank RHSR = getFloatingRank(RHS); 2725 2726 if (LHSR == RHSR) 2727 return 0; 2728 if (LHSR > RHSR) 2729 return 1; 2730 return -1; 2731} 2732 2733/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2734/// routine will assert if passed a built-in type that isn't an integer or enum, 2735/// or if it is not canonicalized. 2736unsigned ASTContext::getIntegerRank(Type *T) { 2737 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 2738 if (EnumType* ET = dyn_cast<EnumType>(T)) 2739 T = ET->getDecl()->getPromotionType().getTypePtr(); 2740 2741 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2742 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2743 2744 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2745 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2746 2747 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2748 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2749 2750 switch (cast<BuiltinType>(T)->getKind()) { 2751 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2752 case BuiltinType::Bool: 2753 return 1 + (getIntWidth(BoolTy) << 3); 2754 case BuiltinType::Char_S: 2755 case BuiltinType::Char_U: 2756 case BuiltinType::SChar: 2757 case BuiltinType::UChar: 2758 return 2 + (getIntWidth(CharTy) << 3); 2759 case BuiltinType::Short: 2760 case BuiltinType::UShort: 2761 return 3 + (getIntWidth(ShortTy) << 3); 2762 case BuiltinType::Int: 2763 case BuiltinType::UInt: 2764 return 4 + (getIntWidth(IntTy) << 3); 2765 case BuiltinType::Long: 2766 case BuiltinType::ULong: 2767 return 5 + (getIntWidth(LongTy) << 3); 2768 case BuiltinType::LongLong: 2769 case BuiltinType::ULongLong: 2770 return 6 + (getIntWidth(LongLongTy) << 3); 2771 case BuiltinType::Int128: 2772 case BuiltinType::UInt128: 2773 return 7 + (getIntWidth(Int128Ty) << 3); 2774 } 2775} 2776 2777/// \brief Whether this is a promotable bitfield reference according 2778/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2779/// 2780/// \returns the type this bit-field will promote to, or NULL if no 2781/// promotion occurs. 2782QualType ASTContext::isPromotableBitField(Expr *E) { 2783 FieldDecl *Field = E->getBitField(); 2784 if (!Field) 2785 return QualType(); 2786 2787 QualType FT = Field->getType(); 2788 2789 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2790 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2791 uint64_t IntSize = getTypeSize(IntTy); 2792 // GCC extension compatibility: if the bit-field size is less than or equal 2793 // to the size of int, it gets promoted no matter what its type is. 2794 // For instance, unsigned long bf : 4 gets promoted to signed int. 2795 if (BitWidth < IntSize) 2796 return IntTy; 2797 2798 if (BitWidth == IntSize) 2799 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2800 2801 // Types bigger than int are not subject to promotions, and therefore act 2802 // like the base type. 2803 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2804 // is ridiculous. 2805 return QualType(); 2806} 2807 2808/// getPromotedIntegerType - Returns the type that Promotable will 2809/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2810/// integer type. 2811QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2812 assert(!Promotable.isNull()); 2813 assert(Promotable->isPromotableIntegerType()); 2814 if (const EnumType *ET = Promotable->getAs<EnumType>()) 2815 return ET->getDecl()->getPromotionType(); 2816 if (Promotable->isSignedIntegerType()) 2817 return IntTy; 2818 uint64_t PromotableSize = getTypeSize(Promotable); 2819 uint64_t IntSize = getTypeSize(IntTy); 2820 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2821 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2822} 2823 2824/// getIntegerTypeOrder - Returns the highest ranked integer type: 2825/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2826/// LHS < RHS, return -1. 2827int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2828 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2829 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2830 if (LHSC == RHSC) return 0; 2831 2832 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2833 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2834 2835 unsigned LHSRank = getIntegerRank(LHSC); 2836 unsigned RHSRank = getIntegerRank(RHSC); 2837 2838 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2839 if (LHSRank == RHSRank) return 0; 2840 return LHSRank > RHSRank ? 1 : -1; 2841 } 2842 2843 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2844 if (LHSUnsigned) { 2845 // If the unsigned [LHS] type is larger, return it. 2846 if (LHSRank >= RHSRank) 2847 return 1; 2848 2849 // If the signed type can represent all values of the unsigned type, it 2850 // wins. Because we are dealing with 2's complement and types that are 2851 // powers of two larger than each other, this is always safe. 2852 return -1; 2853 } 2854 2855 // If the unsigned [RHS] type is larger, return it. 2856 if (RHSRank >= LHSRank) 2857 return -1; 2858 2859 // If the signed type can represent all values of the unsigned type, it 2860 // wins. Because we are dealing with 2's complement and types that are 2861 // powers of two larger than each other, this is always safe. 2862 return 1; 2863} 2864 2865static RecordDecl * 2866CreateRecordDecl(ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 2867 SourceLocation L, IdentifierInfo *Id) { 2868 if (Ctx.getLangOptions().CPlusPlus) 2869 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 2870 else 2871 return RecordDecl::Create(Ctx, TK, DC, L, Id); 2872} 2873 2874// getCFConstantStringType - Return the type used for constant CFStrings. 2875QualType ASTContext::getCFConstantStringType() { 2876 if (!CFConstantStringTypeDecl) { 2877 CFConstantStringTypeDecl = 2878 CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2879 &Idents.get("NSConstantString")); 2880 CFConstantStringTypeDecl->startDefinition(); 2881 2882 QualType FieldTypes[4]; 2883 2884 // const int *isa; 2885 FieldTypes[0] = getPointerType(IntTy.withConst()); 2886 // int flags; 2887 FieldTypes[1] = IntTy; 2888 // const char *str; 2889 FieldTypes[2] = getPointerType(CharTy.withConst()); 2890 // long length; 2891 FieldTypes[3] = LongTy; 2892 2893 // Create fields 2894 for (unsigned i = 0; i < 4; ++i) { 2895 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2896 SourceLocation(), 0, 2897 FieldTypes[i], /*TInfo=*/0, 2898 /*BitWidth=*/0, 2899 /*Mutable=*/false); 2900 CFConstantStringTypeDecl->addDecl(Field); 2901 } 2902 2903 CFConstantStringTypeDecl->completeDefinition(); 2904 } 2905 2906 return getTagDeclType(CFConstantStringTypeDecl); 2907} 2908 2909void ASTContext::setCFConstantStringType(QualType T) { 2910 const RecordType *Rec = T->getAs<RecordType>(); 2911 assert(Rec && "Invalid CFConstantStringType"); 2912 CFConstantStringTypeDecl = Rec->getDecl(); 2913} 2914 2915// getNSConstantStringType - Return the type used for constant NSStrings. 2916QualType ASTContext::getNSConstantStringType() { 2917 if (!NSConstantStringTypeDecl) { 2918 NSConstantStringTypeDecl = 2919 CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2920 &Idents.get("__builtin_NSString")); 2921 NSConstantStringTypeDecl->startDefinition(); 2922 2923 QualType FieldTypes[3]; 2924 2925 // const int *isa; 2926 FieldTypes[0] = getPointerType(IntTy.withConst()); 2927 // const char *str; 2928 FieldTypes[1] = getPointerType(CharTy.withConst()); 2929 // unsigned int length; 2930 FieldTypes[2] = UnsignedIntTy; 2931 2932 // Create fields 2933 for (unsigned i = 0; i < 3; ++i) { 2934 FieldDecl *Field = FieldDecl::Create(*this, NSConstantStringTypeDecl, 2935 SourceLocation(), 0, 2936 FieldTypes[i], /*TInfo=*/0, 2937 /*BitWidth=*/0, 2938 /*Mutable=*/false); 2939 NSConstantStringTypeDecl->addDecl(Field); 2940 } 2941 2942 NSConstantStringTypeDecl->completeDefinition(); 2943 } 2944 2945 return getTagDeclType(NSConstantStringTypeDecl); 2946} 2947 2948void ASTContext::setNSConstantStringType(QualType T) { 2949 const RecordType *Rec = T->getAs<RecordType>(); 2950 assert(Rec && "Invalid NSConstantStringType"); 2951 NSConstantStringTypeDecl = Rec->getDecl(); 2952} 2953 2954QualType ASTContext::getObjCFastEnumerationStateType() { 2955 if (!ObjCFastEnumerationStateTypeDecl) { 2956 ObjCFastEnumerationStateTypeDecl = 2957 CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2958 &Idents.get("__objcFastEnumerationState")); 2959 ObjCFastEnumerationStateTypeDecl->startDefinition(); 2960 2961 QualType FieldTypes[] = { 2962 UnsignedLongTy, 2963 getPointerType(ObjCIdTypedefType), 2964 getPointerType(UnsignedLongTy), 2965 getConstantArrayType(UnsignedLongTy, 2966 llvm::APInt(32, 5), ArrayType::Normal, 0) 2967 }; 2968 2969 for (size_t i = 0; i < 4; ++i) { 2970 FieldDecl *Field = FieldDecl::Create(*this, 2971 ObjCFastEnumerationStateTypeDecl, 2972 SourceLocation(), 0, 2973 FieldTypes[i], /*TInfo=*/0, 2974 /*BitWidth=*/0, 2975 /*Mutable=*/false); 2976 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2977 } 2978 2979 ObjCFastEnumerationStateTypeDecl->completeDefinition(); 2980 } 2981 2982 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2983} 2984 2985QualType ASTContext::getBlockDescriptorType() { 2986 if (BlockDescriptorType) 2987 return getTagDeclType(BlockDescriptorType); 2988 2989 RecordDecl *T; 2990 // FIXME: Needs the FlagAppleBlock bit. 2991 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2992 &Idents.get("__block_descriptor")); 2993 T->startDefinition(); 2994 2995 QualType FieldTypes[] = { 2996 UnsignedLongTy, 2997 UnsignedLongTy, 2998 }; 2999 3000 const char *FieldNames[] = { 3001 "reserved", 3002 "Size" 3003 }; 3004 3005 for (size_t i = 0; i < 2; ++i) { 3006 FieldDecl *Field = FieldDecl::Create(*this, 3007 T, 3008 SourceLocation(), 3009 &Idents.get(FieldNames[i]), 3010 FieldTypes[i], /*TInfo=*/0, 3011 /*BitWidth=*/0, 3012 /*Mutable=*/false); 3013 T->addDecl(Field); 3014 } 3015 3016 T->completeDefinition(); 3017 3018 BlockDescriptorType = T; 3019 3020 return getTagDeclType(BlockDescriptorType); 3021} 3022 3023void ASTContext::setBlockDescriptorType(QualType T) { 3024 const RecordType *Rec = T->getAs<RecordType>(); 3025 assert(Rec && "Invalid BlockDescriptorType"); 3026 BlockDescriptorType = Rec->getDecl(); 3027} 3028 3029QualType ASTContext::getBlockDescriptorExtendedType() { 3030 if (BlockDescriptorExtendedType) 3031 return getTagDeclType(BlockDescriptorExtendedType); 3032 3033 RecordDecl *T; 3034 // FIXME: Needs the FlagAppleBlock bit. 3035 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 3036 &Idents.get("__block_descriptor_withcopydispose")); 3037 T->startDefinition(); 3038 3039 QualType FieldTypes[] = { 3040 UnsignedLongTy, 3041 UnsignedLongTy, 3042 getPointerType(VoidPtrTy), 3043 getPointerType(VoidPtrTy) 3044 }; 3045 3046 const char *FieldNames[] = { 3047 "reserved", 3048 "Size", 3049 "CopyFuncPtr", 3050 "DestroyFuncPtr" 3051 }; 3052 3053 for (size_t i = 0; i < 4; ++i) { 3054 FieldDecl *Field = FieldDecl::Create(*this, 3055 T, 3056 SourceLocation(), 3057 &Idents.get(FieldNames[i]), 3058 FieldTypes[i], /*TInfo=*/0, 3059 /*BitWidth=*/0, 3060 /*Mutable=*/false); 3061 T->addDecl(Field); 3062 } 3063 3064 T->completeDefinition(); 3065 3066 BlockDescriptorExtendedType = T; 3067 3068 return getTagDeclType(BlockDescriptorExtendedType); 3069} 3070 3071void ASTContext::setBlockDescriptorExtendedType(QualType T) { 3072 const RecordType *Rec = T->getAs<RecordType>(); 3073 assert(Rec && "Invalid BlockDescriptorType"); 3074 BlockDescriptorExtendedType = Rec->getDecl(); 3075} 3076 3077bool ASTContext::BlockRequiresCopying(QualType Ty) { 3078 if (Ty->isBlockPointerType()) 3079 return true; 3080 if (isObjCNSObjectType(Ty)) 3081 return true; 3082 if (Ty->isObjCObjectPointerType()) 3083 return true; 3084 return false; 3085} 3086 3087QualType ASTContext::BuildByRefType(const char *DeclName, QualType Ty) { 3088 // type = struct __Block_byref_1_X { 3089 // void *__isa; 3090 // struct __Block_byref_1_X *__forwarding; 3091 // unsigned int __flags; 3092 // unsigned int __size; 3093 // void *__copy_helper; // as needed 3094 // void *__destroy_help // as needed 3095 // int X; 3096 // } * 3097 3098 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 3099 3100 // FIXME: Move up 3101 static unsigned int UniqueBlockByRefTypeID = 0; 3102 llvm::SmallString<36> Name; 3103 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 3104 ++UniqueBlockByRefTypeID << '_' << DeclName; 3105 RecordDecl *T; 3106 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 3107 &Idents.get(Name.str())); 3108 T->startDefinition(); 3109 QualType Int32Ty = IntTy; 3110 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 3111 QualType FieldTypes[] = { 3112 getPointerType(VoidPtrTy), 3113 getPointerType(getTagDeclType(T)), 3114 Int32Ty, 3115 Int32Ty, 3116 getPointerType(VoidPtrTy), 3117 getPointerType(VoidPtrTy), 3118 Ty 3119 }; 3120 3121 const char *FieldNames[] = { 3122 "__isa", 3123 "__forwarding", 3124 "__flags", 3125 "__size", 3126 "__copy_helper", 3127 "__destroy_helper", 3128 DeclName, 3129 }; 3130 3131 for (size_t i = 0; i < 7; ++i) { 3132 if (!HasCopyAndDispose && i >=4 && i <= 5) 3133 continue; 3134 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3135 &Idents.get(FieldNames[i]), 3136 FieldTypes[i], /*TInfo=*/0, 3137 /*BitWidth=*/0, /*Mutable=*/false); 3138 T->addDecl(Field); 3139 } 3140 3141 T->completeDefinition(); 3142 3143 return getPointerType(getTagDeclType(T)); 3144} 3145 3146 3147QualType ASTContext::getBlockParmType( 3148 bool BlockHasCopyDispose, 3149 llvm::SmallVector<const Expr *, 8> &BlockDeclRefDecls) { 3150 // FIXME: Move up 3151 static unsigned int UniqueBlockParmTypeID = 0; 3152 llvm::SmallString<36> Name; 3153 llvm::raw_svector_ostream(Name) << "__block_literal_" 3154 << ++UniqueBlockParmTypeID; 3155 RecordDecl *T; 3156 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 3157 &Idents.get(Name.str())); 3158 T->startDefinition(); 3159 QualType FieldTypes[] = { 3160 getPointerType(VoidPtrTy), 3161 IntTy, 3162 IntTy, 3163 getPointerType(VoidPtrTy), 3164 (BlockHasCopyDispose ? 3165 getPointerType(getBlockDescriptorExtendedType()) : 3166 getPointerType(getBlockDescriptorType())) 3167 }; 3168 3169 const char *FieldNames[] = { 3170 "__isa", 3171 "__flags", 3172 "__reserved", 3173 "__FuncPtr", 3174 "__descriptor" 3175 }; 3176 3177 for (size_t i = 0; i < 5; ++i) { 3178 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3179 &Idents.get(FieldNames[i]), 3180 FieldTypes[i], /*TInfo=*/0, 3181 /*BitWidth=*/0, /*Mutable=*/false); 3182 T->addDecl(Field); 3183 } 3184 3185 for (size_t i = 0; i < BlockDeclRefDecls.size(); ++i) { 3186 const Expr *E = BlockDeclRefDecls[i]; 3187 const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); 3188 clang::IdentifierInfo *Name = 0; 3189 if (BDRE) { 3190 const ValueDecl *D = BDRE->getDecl(); 3191 Name = &Idents.get(D->getName()); 3192 } 3193 QualType FieldType = E->getType(); 3194 3195 if (BDRE && BDRE->isByRef()) 3196 FieldType = BuildByRefType(BDRE->getDecl()->getNameAsCString(), 3197 FieldType); 3198 3199 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3200 Name, FieldType, /*TInfo=*/0, 3201 /*BitWidth=*/0, /*Mutable=*/false); 3202 T->addDecl(Field); 3203 } 3204 3205 T->completeDefinition(); 3206 3207 return getPointerType(getTagDeclType(T)); 3208} 3209 3210void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3211 const RecordType *Rec = T->getAs<RecordType>(); 3212 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3213 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3214} 3215 3216// This returns true if a type has been typedefed to BOOL: 3217// typedef <type> BOOL; 3218static bool isTypeTypedefedAsBOOL(QualType T) { 3219 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3220 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3221 return II->isStr("BOOL"); 3222 3223 return false; 3224} 3225 3226/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3227/// purpose. 3228CharUnits ASTContext::getObjCEncodingTypeSize(QualType type) { 3229 CharUnits sz = getTypeSizeInChars(type); 3230 3231 // Make all integer and enum types at least as large as an int 3232 if (sz.isPositive() && type->isIntegralType()) 3233 sz = std::max(sz, getTypeSizeInChars(IntTy)); 3234 // Treat arrays as pointers, since that's how they're passed in. 3235 else if (type->isArrayType()) 3236 sz = getTypeSizeInChars(VoidPtrTy); 3237 return sz; 3238} 3239 3240static inline 3241std::string charUnitsToString(const CharUnits &CU) { 3242 return llvm::itostr(CU.getQuantity()); 3243} 3244 3245/// getObjCEncodingForBlockDecl - Return the encoded type for this block 3246/// declaration. 3247void ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr, 3248 std::string& S) { 3249 const BlockDecl *Decl = Expr->getBlockDecl(); 3250 QualType BlockTy = 3251 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3252 // Encode result type. 3253 getObjCEncodingForType(cast<FunctionType>(BlockTy)->getResultType(), S); 3254 // Compute size of all parameters. 3255 // Start with computing size of a pointer in number of bytes. 3256 // FIXME: There might(should) be a better way of doing this computation! 3257 SourceLocation Loc; 3258 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3259 CharUnits ParmOffset = PtrSize; 3260 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), 3261 E = Decl->param_end(); PI != E; ++PI) { 3262 QualType PType = (*PI)->getType(); 3263 CharUnits sz = getObjCEncodingTypeSize(PType); 3264 assert (sz.isPositive() && "BlockExpr - Incomplete param type"); 3265 ParmOffset += sz; 3266 } 3267 // Size of the argument frame 3268 S += charUnitsToString(ParmOffset); 3269 // Block pointer and offset. 3270 S += "@?0"; 3271 ParmOffset = PtrSize; 3272 3273 // Argument types. 3274 ParmOffset = PtrSize; 3275 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3276 Decl->param_end(); PI != E; ++PI) { 3277 ParmVarDecl *PVDecl = *PI; 3278 QualType PType = PVDecl->getOriginalType(); 3279 if (const ArrayType *AT = 3280 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3281 // Use array's original type only if it has known number of 3282 // elements. 3283 if (!isa<ConstantArrayType>(AT)) 3284 PType = PVDecl->getType(); 3285 } else if (PType->isFunctionType()) 3286 PType = PVDecl->getType(); 3287 getObjCEncodingForType(PType, S); 3288 S += charUnitsToString(ParmOffset); 3289 ParmOffset += getObjCEncodingTypeSize(PType); 3290 } 3291} 3292 3293/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3294/// declaration. 3295void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3296 std::string& S) { 3297 // FIXME: This is not very efficient. 3298 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3299 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3300 // Encode result type. 3301 getObjCEncodingForType(Decl->getResultType(), S); 3302 // Compute size of all parameters. 3303 // Start with computing size of a pointer in number of bytes. 3304 // FIXME: There might(should) be a better way of doing this computation! 3305 SourceLocation Loc; 3306 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3307 // The first two arguments (self and _cmd) are pointers; account for 3308 // their size. 3309 CharUnits ParmOffset = 2 * PtrSize; 3310 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3311 E = Decl->sel_param_end(); PI != E; ++PI) { 3312 QualType PType = (*PI)->getType(); 3313 CharUnits sz = getObjCEncodingTypeSize(PType); 3314 assert (sz.isPositive() && 3315 "getObjCEncodingForMethodDecl - Incomplete param type"); 3316 ParmOffset += sz; 3317 } 3318 S += charUnitsToString(ParmOffset); 3319 S += "@0:"; 3320 S += charUnitsToString(PtrSize); 3321 3322 // Argument types. 3323 ParmOffset = 2 * PtrSize; 3324 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3325 E = Decl->sel_param_end(); PI != E; ++PI) { 3326 ParmVarDecl *PVDecl = *PI; 3327 QualType PType = PVDecl->getOriginalType(); 3328 if (const ArrayType *AT = 3329 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3330 // Use array's original type only if it has known number of 3331 // elements. 3332 if (!isa<ConstantArrayType>(AT)) 3333 PType = PVDecl->getType(); 3334 } else if (PType->isFunctionType()) 3335 PType = PVDecl->getType(); 3336 // Process argument qualifiers for user supplied arguments; such as, 3337 // 'in', 'inout', etc. 3338 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3339 getObjCEncodingForType(PType, S); 3340 S += charUnitsToString(ParmOffset); 3341 ParmOffset += getObjCEncodingTypeSize(PType); 3342 } 3343} 3344 3345/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3346/// property declaration. If non-NULL, Container must be either an 3347/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3348/// NULL when getting encodings for protocol properties. 3349/// Property attributes are stored as a comma-delimited C string. The simple 3350/// attributes readonly and bycopy are encoded as single characters. The 3351/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3352/// encoded as single characters, followed by an identifier. Property types 3353/// are also encoded as a parametrized attribute. The characters used to encode 3354/// these attributes are defined by the following enumeration: 3355/// @code 3356/// enum PropertyAttributes { 3357/// kPropertyReadOnly = 'R', // property is read-only. 3358/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3359/// kPropertyByref = '&', // property is a reference to the value last assigned 3360/// kPropertyDynamic = 'D', // property is dynamic 3361/// kPropertyGetter = 'G', // followed by getter selector name 3362/// kPropertySetter = 'S', // followed by setter selector name 3363/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3364/// kPropertyType = 't' // followed by old-style type encoding. 3365/// kPropertyWeak = 'W' // 'weak' property 3366/// kPropertyStrong = 'P' // property GC'able 3367/// kPropertyNonAtomic = 'N' // property non-atomic 3368/// }; 3369/// @endcode 3370void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3371 const Decl *Container, 3372 std::string& S) { 3373 // Collect information from the property implementation decl(s). 3374 bool Dynamic = false; 3375 ObjCPropertyImplDecl *SynthesizePID = 0; 3376 3377 // FIXME: Duplicated code due to poor abstraction. 3378 if (Container) { 3379 if (const ObjCCategoryImplDecl *CID = 3380 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3381 for (ObjCCategoryImplDecl::propimpl_iterator 3382 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3383 i != e; ++i) { 3384 ObjCPropertyImplDecl *PID = *i; 3385 if (PID->getPropertyDecl() == PD) { 3386 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3387 Dynamic = true; 3388 } else { 3389 SynthesizePID = PID; 3390 } 3391 } 3392 } 3393 } else { 3394 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3395 for (ObjCCategoryImplDecl::propimpl_iterator 3396 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3397 i != e; ++i) { 3398 ObjCPropertyImplDecl *PID = *i; 3399 if (PID->getPropertyDecl() == PD) { 3400 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3401 Dynamic = true; 3402 } else { 3403 SynthesizePID = PID; 3404 } 3405 } 3406 } 3407 } 3408 } 3409 3410 // FIXME: This is not very efficient. 3411 S = "T"; 3412 3413 // Encode result type. 3414 // GCC has some special rules regarding encoding of properties which 3415 // closely resembles encoding of ivars. 3416 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3417 true /* outermost type */, 3418 true /* encoding for property */); 3419 3420 if (PD->isReadOnly()) { 3421 S += ",R"; 3422 } else { 3423 switch (PD->getSetterKind()) { 3424 case ObjCPropertyDecl::Assign: break; 3425 case ObjCPropertyDecl::Copy: S += ",C"; break; 3426 case ObjCPropertyDecl::Retain: S += ",&"; break; 3427 } 3428 } 3429 3430 // It really isn't clear at all what this means, since properties 3431 // are "dynamic by default". 3432 if (Dynamic) 3433 S += ",D"; 3434 3435 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3436 S += ",N"; 3437 3438 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3439 S += ",G"; 3440 S += PD->getGetterName().getAsString(); 3441 } 3442 3443 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3444 S += ",S"; 3445 S += PD->getSetterName().getAsString(); 3446 } 3447 3448 if (SynthesizePID) { 3449 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3450 S += ",V"; 3451 S += OID->getNameAsString(); 3452 } 3453 3454 // FIXME: OBJCGC: weak & strong 3455} 3456 3457/// getLegacyIntegralTypeEncoding - 3458/// Another legacy compatibility encoding: 32-bit longs are encoded as 3459/// 'l' or 'L' , but not always. For typedefs, we need to use 3460/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3461/// 3462void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3463 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3464 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3465 if (BT->getKind() == BuiltinType::ULong && 3466 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3467 PointeeTy = UnsignedIntTy; 3468 else 3469 if (BT->getKind() == BuiltinType::Long && 3470 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3471 PointeeTy = IntTy; 3472 } 3473 } 3474} 3475 3476void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3477 const FieldDecl *Field) { 3478 // We follow the behavior of gcc, expanding structures which are 3479 // directly pointed to, and expanding embedded structures. Note that 3480 // these rules are sufficient to prevent recursive encoding of the 3481 // same type. 3482 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3483 true /* outermost type */); 3484} 3485 3486static void EncodeBitField(const ASTContext *Context, std::string& S, 3487 const FieldDecl *FD) { 3488 const Expr *E = FD->getBitWidth(); 3489 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3490 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3491 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3492 S += 'b'; 3493 S += llvm::utostr(N); 3494} 3495 3496// FIXME: Use SmallString for accumulating string. 3497void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3498 bool ExpandPointedToStructures, 3499 bool ExpandStructures, 3500 const FieldDecl *FD, 3501 bool OutermostType, 3502 bool EncodingProperty) { 3503 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3504 if (FD && FD->isBitField()) 3505 return EncodeBitField(this, S, FD); 3506 char encoding; 3507 switch (BT->getKind()) { 3508 default: assert(0 && "Unhandled builtin type kind"); 3509 case BuiltinType::Void: encoding = 'v'; break; 3510 case BuiltinType::Bool: encoding = 'B'; break; 3511 case BuiltinType::Char_U: 3512 case BuiltinType::UChar: encoding = 'C'; break; 3513 case BuiltinType::UShort: encoding = 'S'; break; 3514 case BuiltinType::UInt: encoding = 'I'; break; 3515 case BuiltinType::ULong: 3516 encoding = 3517 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3518 break; 3519 case BuiltinType::UInt128: encoding = 'T'; break; 3520 case BuiltinType::ULongLong: encoding = 'Q'; break; 3521 case BuiltinType::Char_S: 3522 case BuiltinType::SChar: encoding = 'c'; break; 3523 case BuiltinType::Short: encoding = 's'; break; 3524 case BuiltinType::Int: encoding = 'i'; break; 3525 case BuiltinType::Long: 3526 encoding = 3527 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3528 break; 3529 case BuiltinType::LongLong: encoding = 'q'; break; 3530 case BuiltinType::Int128: encoding = 't'; break; 3531 case BuiltinType::Float: encoding = 'f'; break; 3532 case BuiltinType::Double: encoding = 'd'; break; 3533 case BuiltinType::LongDouble: encoding = 'd'; break; 3534 } 3535 3536 S += encoding; 3537 return; 3538 } 3539 3540 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3541 S += 'j'; 3542 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3543 false); 3544 return; 3545 } 3546 3547 // encoding for pointer or r3eference types. 3548 QualType PointeeTy; 3549 if (const PointerType *PT = T->getAs<PointerType>()) { 3550 if (PT->isObjCSelType()) { 3551 S += ':'; 3552 return; 3553 } 3554 PointeeTy = PT->getPointeeType(); 3555 } 3556 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 3557 PointeeTy = RT->getPointeeType(); 3558 if (!PointeeTy.isNull()) { 3559 bool isReadOnly = false; 3560 // For historical/compatibility reasons, the read-only qualifier of the 3561 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3562 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3563 // Also, do not emit the 'r' for anything but the outermost type! 3564 if (isa<TypedefType>(T.getTypePtr())) { 3565 if (OutermostType && T.isConstQualified()) { 3566 isReadOnly = true; 3567 S += 'r'; 3568 } 3569 } else if (OutermostType) { 3570 QualType P = PointeeTy; 3571 while (P->getAs<PointerType>()) 3572 P = P->getAs<PointerType>()->getPointeeType(); 3573 if (P.isConstQualified()) { 3574 isReadOnly = true; 3575 S += 'r'; 3576 } 3577 } 3578 if (isReadOnly) { 3579 // Another legacy compatibility encoding. Some ObjC qualifier and type 3580 // combinations need to be rearranged. 3581 // Rewrite "in const" from "nr" to "rn" 3582 const char * s = S.c_str(); 3583 int len = S.length(); 3584 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3585 std::string replace = "rn"; 3586 S.replace(S.end()-2, S.end(), replace); 3587 } 3588 } 3589 3590 if (PointeeTy->isCharType()) { 3591 // char pointer types should be encoded as '*' unless it is a 3592 // type that has been typedef'd to 'BOOL'. 3593 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3594 S += '*'; 3595 return; 3596 } 3597 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3598 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3599 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3600 S += '#'; 3601 return; 3602 } 3603 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3604 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3605 S += '@'; 3606 return; 3607 } 3608 // fall through... 3609 } 3610 S += '^'; 3611 getLegacyIntegralTypeEncoding(PointeeTy); 3612 3613 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3614 NULL); 3615 return; 3616 } 3617 3618 if (const ArrayType *AT = 3619 // Ignore type qualifiers etc. 3620 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3621 if (isa<IncompleteArrayType>(AT)) { 3622 // Incomplete arrays are encoded as a pointer to the array element. 3623 S += '^'; 3624 3625 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3626 false, ExpandStructures, FD); 3627 } else { 3628 S += '['; 3629 3630 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3631 S += llvm::utostr(CAT->getSize().getZExtValue()); 3632 else { 3633 //Variable length arrays are encoded as a regular array with 0 elements. 3634 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3635 S += '0'; 3636 } 3637 3638 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3639 false, ExpandStructures, FD); 3640 S += ']'; 3641 } 3642 return; 3643 } 3644 3645 if (T->getAs<FunctionType>()) { 3646 S += '?'; 3647 return; 3648 } 3649 3650 if (const RecordType *RTy = T->getAs<RecordType>()) { 3651 RecordDecl *RDecl = RTy->getDecl(); 3652 S += RDecl->isUnion() ? '(' : '{'; 3653 // Anonymous structures print as '?' 3654 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3655 S += II->getName(); 3656 } else { 3657 S += '?'; 3658 } 3659 if (ExpandStructures) { 3660 S += '='; 3661 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3662 FieldEnd = RDecl->field_end(); 3663 Field != FieldEnd; ++Field) { 3664 if (FD) { 3665 S += '"'; 3666 S += Field->getNameAsString(); 3667 S += '"'; 3668 } 3669 3670 // Special case bit-fields. 3671 if (Field->isBitField()) { 3672 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3673 (*Field)); 3674 } else { 3675 QualType qt = Field->getType(); 3676 getLegacyIntegralTypeEncoding(qt); 3677 getObjCEncodingForTypeImpl(qt, S, false, true, 3678 FD); 3679 } 3680 } 3681 } 3682 S += RDecl->isUnion() ? ')' : '}'; 3683 return; 3684 } 3685 3686 if (T->isEnumeralType()) { 3687 if (FD && FD->isBitField()) 3688 EncodeBitField(this, S, FD); 3689 else 3690 S += 'i'; 3691 return; 3692 } 3693 3694 if (T->isBlockPointerType()) { 3695 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3696 return; 3697 } 3698 3699 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3700 // @encode(class_name) 3701 ObjCInterfaceDecl *OI = OIT->getDecl(); 3702 S += '{'; 3703 const IdentifierInfo *II = OI->getIdentifier(); 3704 S += II->getName(); 3705 S += '='; 3706 llvm::SmallVector<FieldDecl*, 32> RecFields; 3707 CollectObjCIvars(OI, RecFields); 3708 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3709 if (RecFields[i]->isBitField()) 3710 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3711 RecFields[i]); 3712 else 3713 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3714 FD); 3715 } 3716 S += '}'; 3717 return; 3718 } 3719 3720 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3721 if (OPT->isObjCIdType()) { 3722 S += '@'; 3723 return; 3724 } 3725 3726 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 3727 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 3728 // Since this is a binary compatibility issue, need to consult with runtime 3729 // folks. Fortunately, this is a *very* obsure construct. 3730 S += '#'; 3731 return; 3732 } 3733 3734 if (OPT->isObjCQualifiedIdType()) { 3735 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3736 ExpandPointedToStructures, 3737 ExpandStructures, FD); 3738 if (FD || EncodingProperty) { 3739 // Note that we do extended encoding of protocol qualifer list 3740 // Only when doing ivar or property encoding. 3741 S += '"'; 3742 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3743 E = OPT->qual_end(); I != E; ++I) { 3744 S += '<'; 3745 S += (*I)->getNameAsString(); 3746 S += '>'; 3747 } 3748 S += '"'; 3749 } 3750 return; 3751 } 3752 3753 QualType PointeeTy = OPT->getPointeeType(); 3754 if (!EncodingProperty && 3755 isa<TypedefType>(PointeeTy.getTypePtr())) { 3756 // Another historical/compatibility reason. 3757 // We encode the underlying type which comes out as 3758 // {...}; 3759 S += '^'; 3760 getObjCEncodingForTypeImpl(PointeeTy, S, 3761 false, ExpandPointedToStructures, 3762 NULL); 3763 return; 3764 } 3765 3766 S += '@'; 3767 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 3768 S += '"'; 3769 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 3770 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3771 E = OPT->qual_end(); I != E; ++I) { 3772 S += '<'; 3773 S += (*I)->getNameAsString(); 3774 S += '>'; 3775 } 3776 S += '"'; 3777 } 3778 return; 3779 } 3780 3781 assert(0 && "@encode for type not implemented!"); 3782} 3783 3784void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3785 std::string& S) const { 3786 if (QT & Decl::OBJC_TQ_In) 3787 S += 'n'; 3788 if (QT & Decl::OBJC_TQ_Inout) 3789 S += 'N'; 3790 if (QT & Decl::OBJC_TQ_Out) 3791 S += 'o'; 3792 if (QT & Decl::OBJC_TQ_Bycopy) 3793 S += 'O'; 3794 if (QT & Decl::OBJC_TQ_Byref) 3795 S += 'R'; 3796 if (QT & Decl::OBJC_TQ_Oneway) 3797 S += 'V'; 3798} 3799 3800void ASTContext::setBuiltinVaListType(QualType T) { 3801 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3802 3803 BuiltinVaListType = T; 3804} 3805 3806void ASTContext::setObjCIdType(QualType T) { 3807 ObjCIdTypedefType = T; 3808} 3809 3810void ASTContext::setObjCSelType(QualType T) { 3811 ObjCSelTypedefType = T; 3812} 3813 3814void ASTContext::setObjCProtoType(QualType QT) { 3815 ObjCProtoType = QT; 3816} 3817 3818void ASTContext::setObjCClassType(QualType T) { 3819 ObjCClassTypedefType = T; 3820} 3821 3822void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3823 assert(ObjCConstantStringType.isNull() && 3824 "'NSConstantString' type already set!"); 3825 3826 ObjCConstantStringType = getObjCInterfaceType(Decl); 3827} 3828 3829/// \brief Retrieve the template name that corresponds to a non-empty 3830/// lookup. 3831TemplateName ASTContext::getOverloadedTemplateName(UnresolvedSetIterator Begin, 3832 UnresolvedSetIterator End) { 3833 unsigned size = End - Begin; 3834 assert(size > 1 && "set is not overloaded!"); 3835 3836 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 3837 size * sizeof(FunctionTemplateDecl*)); 3838 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 3839 3840 NamedDecl **Storage = OT->getStorage(); 3841 for (UnresolvedSetIterator I = Begin; I != End; ++I) { 3842 NamedDecl *D = *I; 3843 assert(isa<FunctionTemplateDecl>(D) || 3844 (isa<UsingShadowDecl>(D) && 3845 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 3846 *Storage++ = D; 3847 } 3848 3849 return TemplateName(OT); 3850} 3851 3852/// \brief Retrieve the template name that represents a qualified 3853/// template name such as \c std::vector. 3854TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3855 bool TemplateKeyword, 3856 TemplateDecl *Template) { 3857 // FIXME: Canonicalization? 3858 llvm::FoldingSetNodeID ID; 3859 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3860 3861 void *InsertPos = 0; 3862 QualifiedTemplateName *QTN = 3863 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3864 if (!QTN) { 3865 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3866 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3867 } 3868 3869 return TemplateName(QTN); 3870} 3871 3872/// \brief Retrieve the template name that represents a dependent 3873/// template name such as \c MetaFun::template apply. 3874TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3875 const IdentifierInfo *Name) { 3876 assert((!NNS || NNS->isDependent()) && 3877 "Nested name specifier must be dependent"); 3878 3879 llvm::FoldingSetNodeID ID; 3880 DependentTemplateName::Profile(ID, NNS, Name); 3881 3882 void *InsertPos = 0; 3883 DependentTemplateName *QTN = 3884 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3885 3886 if (QTN) 3887 return TemplateName(QTN); 3888 3889 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3890 if (CanonNNS == NNS) { 3891 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3892 } else { 3893 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3894 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3895 DependentTemplateName *CheckQTN = 3896 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3897 assert(!CheckQTN && "Dependent type name canonicalization broken"); 3898 (void)CheckQTN; 3899 } 3900 3901 DependentTemplateNames.InsertNode(QTN, InsertPos); 3902 return TemplateName(QTN); 3903} 3904 3905/// \brief Retrieve the template name that represents a dependent 3906/// template name such as \c MetaFun::template operator+. 3907TemplateName 3908ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3909 OverloadedOperatorKind Operator) { 3910 assert((!NNS || NNS->isDependent()) && 3911 "Nested name specifier must be dependent"); 3912 3913 llvm::FoldingSetNodeID ID; 3914 DependentTemplateName::Profile(ID, NNS, Operator); 3915 3916 void *InsertPos = 0; 3917 DependentTemplateName *QTN 3918 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3919 3920 if (QTN) 3921 return TemplateName(QTN); 3922 3923 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3924 if (CanonNNS == NNS) { 3925 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 3926 } else { 3927 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 3928 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 3929 3930 DependentTemplateName *CheckQTN 3931 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3932 assert(!CheckQTN && "Dependent template name canonicalization broken"); 3933 (void)CheckQTN; 3934 } 3935 3936 DependentTemplateNames.InsertNode(QTN, InsertPos); 3937 return TemplateName(QTN); 3938} 3939 3940/// getFromTargetType - Given one of the integer types provided by 3941/// TargetInfo, produce the corresponding type. The unsigned @p Type 3942/// is actually a value of type @c TargetInfo::IntType. 3943CanQualType ASTContext::getFromTargetType(unsigned Type) const { 3944 switch (Type) { 3945 case TargetInfo::NoInt: return CanQualType(); 3946 case TargetInfo::SignedShort: return ShortTy; 3947 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3948 case TargetInfo::SignedInt: return IntTy; 3949 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3950 case TargetInfo::SignedLong: return LongTy; 3951 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3952 case TargetInfo::SignedLongLong: return LongLongTy; 3953 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3954 } 3955 3956 assert(false && "Unhandled TargetInfo::IntType value"); 3957 return CanQualType(); 3958} 3959 3960//===----------------------------------------------------------------------===// 3961// Type Predicates. 3962//===----------------------------------------------------------------------===// 3963 3964/// isObjCNSObjectType - Return true if this is an NSObject object using 3965/// NSObject attribute on a c-style pointer type. 3966/// FIXME - Make it work directly on types. 3967/// FIXME: Move to Type. 3968/// 3969bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3970 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3971 if (TypedefDecl *TD = TDT->getDecl()) 3972 if (TD->getAttr<ObjCNSObjectAttr>()) 3973 return true; 3974 } 3975 return false; 3976} 3977 3978/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3979/// garbage collection attribute. 3980/// 3981Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3982 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3983 if (getLangOptions().ObjC1 && 3984 getLangOptions().getGCMode() != LangOptions::NonGC) { 3985 GCAttrs = Ty.getObjCGCAttr(); 3986 // Default behavious under objective-c's gc is for objective-c pointers 3987 // (or pointers to them) be treated as though they were declared 3988 // as __strong. 3989 if (GCAttrs == Qualifiers::GCNone) { 3990 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3991 GCAttrs = Qualifiers::Strong; 3992 else if (Ty->isPointerType()) 3993 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3994 } 3995 // Non-pointers have none gc'able attribute regardless of the attribute 3996 // set on them. 3997 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3998 return Qualifiers::GCNone; 3999 } 4000 return GCAttrs; 4001} 4002 4003//===----------------------------------------------------------------------===// 4004// Type Compatibility Testing 4005//===----------------------------------------------------------------------===// 4006 4007/// areCompatVectorTypes - Return true if the two specified vector types are 4008/// compatible. 4009static bool areCompatVectorTypes(const VectorType *LHS, 4010 const VectorType *RHS) { 4011 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 4012 return LHS->getElementType() == RHS->getElementType() && 4013 LHS->getNumElements() == RHS->getNumElements(); 4014} 4015 4016//===----------------------------------------------------------------------===// 4017// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 4018//===----------------------------------------------------------------------===// 4019 4020/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 4021/// inheritance hierarchy of 'rProto'. 4022bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 4023 ObjCProtocolDecl *rProto) { 4024 if (lProto == rProto) 4025 return true; 4026 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 4027 E = rProto->protocol_end(); PI != E; ++PI) 4028 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 4029 return true; 4030 return false; 4031} 4032 4033/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 4034/// return true if lhs's protocols conform to rhs's protocol; false 4035/// otherwise. 4036bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 4037 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 4038 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 4039 return false; 4040} 4041 4042/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 4043/// ObjCQualifiedIDType. 4044bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 4045 bool compare) { 4046 // Allow id<P..> and an 'id' or void* type in all cases. 4047 if (lhs->isVoidPointerType() || 4048 lhs->isObjCIdType() || lhs->isObjCClassType()) 4049 return true; 4050 else if (rhs->isVoidPointerType() || 4051 rhs->isObjCIdType() || rhs->isObjCClassType()) 4052 return true; 4053 4054 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 4055 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4056 4057 if (!rhsOPT) return false; 4058 4059 if (rhsOPT->qual_empty()) { 4060 // If the RHS is a unqualified interface pointer "NSString*", 4061 // make sure we check the class hierarchy. 4062 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4063 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4064 E = lhsQID->qual_end(); I != E; ++I) { 4065 // when comparing an id<P> on lhs with a static type on rhs, 4066 // see if static class implements all of id's protocols, directly or 4067 // through its super class and categories. 4068 if (!rhsID->ClassImplementsProtocol(*I, true)) 4069 return false; 4070 } 4071 } 4072 // If there are no qualifiers and no interface, we have an 'id'. 4073 return true; 4074 } 4075 // Both the right and left sides have qualifiers. 4076 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4077 E = lhsQID->qual_end(); I != E; ++I) { 4078 ObjCProtocolDecl *lhsProto = *I; 4079 bool match = false; 4080 4081 // when comparing an id<P> on lhs with a static type on rhs, 4082 // see if static class implements all of id's protocols, directly or 4083 // through its super class and categories. 4084 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4085 E = rhsOPT->qual_end(); J != E; ++J) { 4086 ObjCProtocolDecl *rhsProto = *J; 4087 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4088 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4089 match = true; 4090 break; 4091 } 4092 } 4093 // If the RHS is a qualified interface pointer "NSString<P>*", 4094 // make sure we check the class hierarchy. 4095 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4096 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4097 E = lhsQID->qual_end(); I != E; ++I) { 4098 // when comparing an id<P> on lhs with a static type on rhs, 4099 // see if static class implements all of id's protocols, directly or 4100 // through its super class and categories. 4101 if (rhsID->ClassImplementsProtocol(*I, true)) { 4102 match = true; 4103 break; 4104 } 4105 } 4106 } 4107 if (!match) 4108 return false; 4109 } 4110 4111 return true; 4112 } 4113 4114 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 4115 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 4116 4117 if (const ObjCObjectPointerType *lhsOPT = 4118 lhs->getAsObjCInterfacePointerType()) { 4119 if (lhsOPT->qual_empty()) { 4120 bool match = false; 4121 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 4122 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 4123 E = rhsQID->qual_end(); I != E; ++I) { 4124 // when comparing an id<P> on lhs with a static type on rhs, 4125 // see if static class implements all of id's protocols, directly or 4126 // through its super class and categories. 4127 if (lhsID->ClassImplementsProtocol(*I, true)) { 4128 match = true; 4129 break; 4130 } 4131 } 4132 if (!match) 4133 return false; 4134 } 4135 return true; 4136 } 4137 // Both the right and left sides have qualifiers. 4138 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 4139 E = lhsOPT->qual_end(); I != E; ++I) { 4140 ObjCProtocolDecl *lhsProto = *I; 4141 bool match = false; 4142 4143 // when comparing an id<P> on lhs with a static type on rhs, 4144 // see if static class implements all of id's protocols, directly or 4145 // through its super class and categories. 4146 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4147 E = rhsQID->qual_end(); J != E; ++J) { 4148 ObjCProtocolDecl *rhsProto = *J; 4149 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4150 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4151 match = true; 4152 break; 4153 } 4154 } 4155 if (!match) 4156 return false; 4157 } 4158 return true; 4159 } 4160 return false; 4161} 4162 4163/// canAssignObjCInterfaces - Return true if the two interface types are 4164/// compatible for assignment from RHS to LHS. This handles validation of any 4165/// protocol qualifiers on the LHS or RHS. 4166/// 4167bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4168 const ObjCObjectPointerType *RHSOPT) { 4169 // If either type represents the built-in 'id' or 'Class' types, return true. 4170 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 4171 return true; 4172 4173 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4174 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4175 QualType(RHSOPT,0), 4176 false); 4177 4178 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4179 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4180 if (LHS && RHS) // We have 2 user-defined types. 4181 return canAssignObjCInterfaces(LHS, RHS); 4182 4183 return false; 4184} 4185 4186/// canAssignObjCInterfacesInBlockPointer - This routine is specifically written 4187/// for providing type-safty for objective-c pointers used to pass/return 4188/// arguments in block literals. When passed as arguments, passing 'A*' where 4189/// 'id' is expected is not OK. Passing 'Sub *" where 'Super *" is expected is 4190/// not OK. For the return type, the opposite is not OK. 4191bool ASTContext::canAssignObjCInterfacesInBlockPointer( 4192 const ObjCObjectPointerType *LHSOPT, 4193 const ObjCObjectPointerType *RHSOPT) { 4194 if (RHSOPT->isObjCBuiltinType() || LHSOPT->isObjCIdType()) 4195 return true; 4196 4197 if (LHSOPT->isObjCBuiltinType()) { 4198 return RHSOPT->isObjCBuiltinType() || RHSOPT->isObjCQualifiedIdType(); 4199 } 4200 4201 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4202 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4203 QualType(RHSOPT,0), 4204 false); 4205 4206 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4207 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4208 if (LHS && RHS) { // We have 2 user-defined types. 4209 if (LHS != RHS) { 4210 if (LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4211 return false; 4212 if (RHS->getDecl()->isSuperClassOf(LHS->getDecl())) 4213 return true; 4214 } 4215 else 4216 return true; 4217 } 4218 return false; 4219} 4220 4221/// getIntersectionOfProtocols - This routine finds the intersection of set 4222/// of protocols inherited from two distinct objective-c pointer objects. 4223/// It is used to build composite qualifier list of the composite type of 4224/// the conditional expression involving two objective-c pointer objects. 4225static 4226void getIntersectionOfProtocols(ASTContext &Context, 4227 const ObjCObjectPointerType *LHSOPT, 4228 const ObjCObjectPointerType *RHSOPT, 4229 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4230 4231 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4232 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4233 4234 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4235 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4236 if (LHSNumProtocols > 0) 4237 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4238 else { 4239 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4240 Context.CollectInheritedProtocols(LHS->getDecl(), LHSInheritedProtocols); 4241 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4242 LHSInheritedProtocols.end()); 4243 } 4244 4245 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4246 if (RHSNumProtocols > 0) { 4247 ObjCProtocolDecl **RHSProtocols = 4248 const_cast<ObjCProtocolDecl **>(RHS->qual_begin()); 4249 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4250 if (InheritedProtocolSet.count(RHSProtocols[i])) 4251 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4252 } 4253 else { 4254 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4255 Context.CollectInheritedProtocols(RHS->getDecl(), RHSInheritedProtocols); 4256 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4257 RHSInheritedProtocols.begin(), 4258 E = RHSInheritedProtocols.end(); I != E; ++I) 4259 if (InheritedProtocolSet.count((*I))) 4260 IntersectionOfProtocols.push_back((*I)); 4261 } 4262} 4263 4264/// areCommonBaseCompatible - Returns common base class of the two classes if 4265/// one found. Note that this is O'2 algorithm. But it will be called as the 4266/// last type comparison in a ?-exp of ObjC pointer types before a 4267/// warning is issued. So, its invokation is extremely rare. 4268QualType ASTContext::areCommonBaseCompatible( 4269 const ObjCObjectPointerType *LHSOPT, 4270 const ObjCObjectPointerType *RHSOPT) { 4271 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4272 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4273 if (!LHS || !RHS) 4274 return QualType(); 4275 4276 while (const ObjCInterfaceDecl *LHSIDecl = LHS->getDecl()->getSuperClass()) { 4277 QualType LHSTy = getObjCInterfaceType(LHSIDecl); 4278 LHS = LHSTy->getAs<ObjCInterfaceType>(); 4279 if (canAssignObjCInterfaces(LHS, RHS)) { 4280 llvm::SmallVector<ObjCProtocolDecl *, 8> IntersectionOfProtocols; 4281 getIntersectionOfProtocols(*this, 4282 LHSOPT, RHSOPT, IntersectionOfProtocols); 4283 if (IntersectionOfProtocols.empty()) 4284 LHSTy = getObjCObjectPointerType(LHSTy); 4285 else 4286 LHSTy = getObjCObjectPointerType(LHSTy, &IntersectionOfProtocols[0], 4287 IntersectionOfProtocols.size()); 4288 return LHSTy; 4289 } 4290 } 4291 4292 return QualType(); 4293} 4294 4295bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 4296 const ObjCInterfaceType *RHS) { 4297 // Verify that the base decls are compatible: the RHS must be a subclass of 4298 // the LHS. 4299 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4300 return false; 4301 4302 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4303 // protocol qualified at all, then we are good. 4304 if (LHS->getNumProtocols() == 0) 4305 return true; 4306 4307 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4308 // isn't a superset. 4309 if (RHS->getNumProtocols() == 0) 4310 return true; // FIXME: should return false! 4311 4312 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 4313 LHSPE = LHS->qual_end(); 4314 LHSPI != LHSPE; LHSPI++) { 4315 bool RHSImplementsProtocol = false; 4316 4317 // If the RHS doesn't implement the protocol on the left, the types 4318 // are incompatible. 4319 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 4320 RHSPE = RHS->qual_end(); 4321 RHSPI != RHSPE; RHSPI++) { 4322 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4323 RHSImplementsProtocol = true; 4324 break; 4325 } 4326 } 4327 // FIXME: For better diagnostics, consider passing back the protocol name. 4328 if (!RHSImplementsProtocol) 4329 return false; 4330 } 4331 // The RHS implements all protocols listed on the LHS. 4332 return true; 4333} 4334 4335bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4336 // get the "pointed to" types 4337 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4338 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4339 4340 if (!LHSOPT || !RHSOPT) 4341 return false; 4342 4343 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4344 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4345} 4346 4347/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4348/// both shall have the identically qualified version of a compatible type. 4349/// C99 6.2.7p1: Two types have compatible types if their types are the 4350/// same. See 6.7.[2,3,5] for additional rules. 4351bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 4352 if (getLangOptions().CPlusPlus) 4353 return hasSameType(LHS, RHS); 4354 4355 return !mergeTypes(LHS, RHS).isNull(); 4356} 4357 4358bool ASTContext::typesAreBlockPointerCompatible(QualType LHS, QualType RHS) { 4359 return !mergeTypes(LHS, RHS, true).isNull(); 4360} 4361 4362QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs, 4363 bool OfBlockPointer) { 4364 const FunctionType *lbase = lhs->getAs<FunctionType>(); 4365 const FunctionType *rbase = rhs->getAs<FunctionType>(); 4366 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 4367 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 4368 bool allLTypes = true; 4369 bool allRTypes = true; 4370 4371 // Check return type 4372 QualType retType; 4373 if (OfBlockPointer) 4374 retType = mergeTypes(rbase->getResultType(), lbase->getResultType(), true); 4375 else 4376 retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 4377 if (retType.isNull()) return QualType(); 4378 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 4379 allLTypes = false; 4380 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 4381 allRTypes = false; 4382 // FIXME: double check this 4383 // FIXME: should we error if lbase->getRegParmAttr() != 0 && 4384 // rbase->getRegParmAttr() != 0 && 4385 // lbase->getRegParmAttr() != rbase->getRegParmAttr()? 4386 FunctionType::ExtInfo lbaseInfo = lbase->getExtInfo(); 4387 FunctionType::ExtInfo rbaseInfo = rbase->getExtInfo(); 4388 unsigned RegParm = lbaseInfo.getRegParm() == 0 ? rbaseInfo.getRegParm() : 4389 lbaseInfo.getRegParm(); 4390 bool NoReturn = lbaseInfo.getNoReturn() || rbaseInfo.getNoReturn(); 4391 if (NoReturn != lbaseInfo.getNoReturn() || 4392 RegParm != lbaseInfo.getRegParm()) 4393 allLTypes = false; 4394 if (NoReturn != rbaseInfo.getNoReturn() || 4395 RegParm != rbaseInfo.getRegParm()) 4396 allRTypes = false; 4397 CallingConv lcc = lbaseInfo.getCC(); 4398 CallingConv rcc = rbaseInfo.getCC(); 4399 // Compatible functions must have compatible calling conventions 4400 if (!isSameCallConv(lcc, rcc)) 4401 return QualType(); 4402 4403 if (lproto && rproto) { // two C99 style function prototypes 4404 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 4405 "C++ shouldn't be here"); 4406 unsigned lproto_nargs = lproto->getNumArgs(); 4407 unsigned rproto_nargs = rproto->getNumArgs(); 4408 4409 // Compatible functions must have the same number of arguments 4410 if (lproto_nargs != rproto_nargs) 4411 return QualType(); 4412 4413 // Variadic and non-variadic functions aren't compatible 4414 if (lproto->isVariadic() != rproto->isVariadic()) 4415 return QualType(); 4416 4417 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 4418 return QualType(); 4419 4420 // Check argument compatibility 4421 llvm::SmallVector<QualType, 10> types; 4422 for (unsigned i = 0; i < lproto_nargs; i++) { 4423 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 4424 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 4425 QualType argtype = mergeTypes(largtype, rargtype, OfBlockPointer); 4426 if (argtype.isNull()) return QualType(); 4427 types.push_back(argtype); 4428 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 4429 allLTypes = false; 4430 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 4431 allRTypes = false; 4432 } 4433 if (allLTypes) return lhs; 4434 if (allRTypes) return rhs; 4435 return getFunctionType(retType, types.begin(), types.size(), 4436 lproto->isVariadic(), lproto->getTypeQuals(), 4437 false, false, 0, 0, 4438 FunctionType::ExtInfo(NoReturn, RegParm, lcc)); 4439 } 4440 4441 if (lproto) allRTypes = false; 4442 if (rproto) allLTypes = false; 4443 4444 const FunctionProtoType *proto = lproto ? lproto : rproto; 4445 if (proto) { 4446 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 4447 if (proto->isVariadic()) return QualType(); 4448 // Check that the types are compatible with the types that 4449 // would result from default argument promotions (C99 6.7.5.3p15). 4450 // The only types actually affected are promotable integer 4451 // types and floats, which would be passed as a different 4452 // type depending on whether the prototype is visible. 4453 unsigned proto_nargs = proto->getNumArgs(); 4454 for (unsigned i = 0; i < proto_nargs; ++i) { 4455 QualType argTy = proto->getArgType(i); 4456 4457 // Look at the promotion type of enum types, since that is the type used 4458 // to pass enum values. 4459 if (const EnumType *Enum = argTy->getAs<EnumType>()) 4460 argTy = Enum->getDecl()->getPromotionType(); 4461 4462 if (argTy->isPromotableIntegerType() || 4463 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 4464 return QualType(); 4465 } 4466 4467 if (allLTypes) return lhs; 4468 if (allRTypes) return rhs; 4469 return getFunctionType(retType, proto->arg_type_begin(), 4470 proto->getNumArgs(), proto->isVariadic(), 4471 proto->getTypeQuals(), 4472 false, false, 0, 0, 4473 FunctionType::ExtInfo(NoReturn, RegParm, lcc)); 4474 } 4475 4476 if (allLTypes) return lhs; 4477 if (allRTypes) return rhs; 4478 FunctionType::ExtInfo Info(NoReturn, RegParm, lcc); 4479 return getFunctionNoProtoType(retType, Info); 4480} 4481 4482QualType ASTContext::mergeTypes(QualType LHS, QualType RHS, 4483 bool OfBlockPointer) { 4484 // C++ [expr]: If an expression initially has the type "reference to T", the 4485 // type is adjusted to "T" prior to any further analysis, the expression 4486 // designates the object or function denoted by the reference, and the 4487 // expression is an lvalue unless the reference is an rvalue reference and 4488 // the expression is a function call (possibly inside parentheses). 4489 assert(!LHS->getAs<ReferenceType>() && "LHS is a reference type?"); 4490 assert(!RHS->getAs<ReferenceType>() && "RHS is a reference type?"); 4491 4492 QualType LHSCan = getCanonicalType(LHS), 4493 RHSCan = getCanonicalType(RHS); 4494 4495 // If two types are identical, they are compatible. 4496 if (LHSCan == RHSCan) 4497 return LHS; 4498 4499 // If the qualifiers are different, the types aren't compatible... mostly. 4500 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 4501 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 4502 if (LQuals != RQuals) { 4503 // If any of these qualifiers are different, we have a type 4504 // mismatch. 4505 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 4506 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 4507 return QualType(); 4508 4509 // Exactly one GC qualifier difference is allowed: __strong is 4510 // okay if the other type has no GC qualifier but is an Objective 4511 // C object pointer (i.e. implicitly strong by default). We fix 4512 // this by pretending that the unqualified type was actually 4513 // qualified __strong. 4514 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 4515 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 4516 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 4517 4518 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 4519 return QualType(); 4520 4521 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 4522 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 4523 } 4524 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 4525 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 4526 } 4527 return QualType(); 4528 } 4529 4530 // Okay, qualifiers are equal. 4531 4532 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 4533 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 4534 4535 // We want to consider the two function types to be the same for these 4536 // comparisons, just force one to the other. 4537 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 4538 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 4539 4540 // Same as above for arrays 4541 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 4542 LHSClass = Type::ConstantArray; 4543 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 4544 RHSClass = Type::ConstantArray; 4545 4546 // Canonicalize ExtVector -> Vector. 4547 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 4548 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 4549 4550 // If the canonical type classes don't match. 4551 if (LHSClass != RHSClass) { 4552 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 4553 // a signed integer type, or an unsigned integer type. 4554 // Compatibility is based on the underlying type, not the promotion 4555 // type. 4556 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 4557 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 4558 return RHS; 4559 } 4560 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 4561 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 4562 return LHS; 4563 } 4564 4565 return QualType(); 4566 } 4567 4568 // The canonical type classes match. 4569 switch (LHSClass) { 4570#define TYPE(Class, Base) 4571#define ABSTRACT_TYPE(Class, Base) 4572#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: 4573#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4574#define DEPENDENT_TYPE(Class, Base) case Type::Class: 4575#include "clang/AST/TypeNodes.def" 4576 assert(false && "Non-canonical and dependent types shouldn't get here"); 4577 return QualType(); 4578 4579 case Type::LValueReference: 4580 case Type::RValueReference: 4581 case Type::MemberPointer: 4582 assert(false && "C++ should never be in mergeTypes"); 4583 return QualType(); 4584 4585 case Type::IncompleteArray: 4586 case Type::VariableArray: 4587 case Type::FunctionProto: 4588 case Type::ExtVector: 4589 assert(false && "Types are eliminated above"); 4590 return QualType(); 4591 4592 case Type::Pointer: 4593 { 4594 // Merge two pointer types, while trying to preserve typedef info 4595 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 4596 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 4597 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4598 if (ResultType.isNull()) return QualType(); 4599 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4600 return LHS; 4601 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4602 return RHS; 4603 return getPointerType(ResultType); 4604 } 4605 case Type::BlockPointer: 4606 { 4607 // Merge two block pointer types, while trying to preserve typedef info 4608 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 4609 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 4610 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, OfBlockPointer); 4611 if (ResultType.isNull()) return QualType(); 4612 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4613 return LHS; 4614 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4615 return RHS; 4616 return getBlockPointerType(ResultType); 4617 } 4618 case Type::ConstantArray: 4619 { 4620 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 4621 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 4622 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 4623 return QualType(); 4624 4625 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 4626 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 4627 QualType ResultType = mergeTypes(LHSElem, RHSElem); 4628 if (ResultType.isNull()) return QualType(); 4629 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4630 return LHS; 4631 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4632 return RHS; 4633 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 4634 ArrayType::ArraySizeModifier(), 0); 4635 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 4636 ArrayType::ArraySizeModifier(), 0); 4637 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 4638 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 4639 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4640 return LHS; 4641 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4642 return RHS; 4643 if (LVAT) { 4644 // FIXME: This isn't correct! But tricky to implement because 4645 // the array's size has to be the size of LHS, but the type 4646 // has to be different. 4647 return LHS; 4648 } 4649 if (RVAT) { 4650 // FIXME: This isn't correct! But tricky to implement because 4651 // the array's size has to be the size of RHS, but the type 4652 // has to be different. 4653 return RHS; 4654 } 4655 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4656 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4657 return getIncompleteArrayType(ResultType, 4658 ArrayType::ArraySizeModifier(), 0); 4659 } 4660 case Type::FunctionNoProto: 4661 return mergeFunctionTypes(LHS, RHS, OfBlockPointer); 4662 case Type::Record: 4663 case Type::Enum: 4664 return QualType(); 4665 case Type::Builtin: 4666 // Only exactly equal builtin types are compatible, which is tested above. 4667 return QualType(); 4668 case Type::Complex: 4669 // Distinct complex types are incompatible. 4670 return QualType(); 4671 case Type::Vector: 4672 // FIXME: The merged type should be an ExtVector! 4673 if (areCompatVectorTypes(LHSCan->getAs<VectorType>(), 4674 RHSCan->getAs<VectorType>())) 4675 return LHS; 4676 return QualType(); 4677 case Type::ObjCInterface: { 4678 // Check if the interfaces are assignment compatible. 4679 // FIXME: This should be type compatibility, e.g. whether 4680 // "LHS x; RHS x;" at global scope is legal. 4681 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 4682 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 4683 if (LHSIface && RHSIface && 4684 canAssignObjCInterfaces(LHSIface, RHSIface)) 4685 return LHS; 4686 4687 return QualType(); 4688 } 4689 case Type::ObjCObjectPointer: { 4690 if (OfBlockPointer) { 4691 if (canAssignObjCInterfacesInBlockPointer( 4692 LHS->getAs<ObjCObjectPointerType>(), 4693 RHS->getAs<ObjCObjectPointerType>())) 4694 return LHS; 4695 return QualType(); 4696 } 4697 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4698 RHS->getAs<ObjCObjectPointerType>())) 4699 return LHS; 4700 4701 return QualType(); 4702 } 4703 } 4704 4705 return QualType(); 4706} 4707 4708//===----------------------------------------------------------------------===// 4709// Integer Predicates 4710//===----------------------------------------------------------------------===// 4711 4712unsigned ASTContext::getIntWidth(QualType T) { 4713 if (T->isBooleanType()) 4714 return 1; 4715 if (EnumType *ET = dyn_cast<EnumType>(T)) 4716 T = ET->getDecl()->getIntegerType(); 4717 // For builtin types, just use the standard type sizing method 4718 return (unsigned)getTypeSize(T); 4719} 4720 4721QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4722 assert(T->isSignedIntegerType() && "Unexpected type"); 4723 4724 // Turn <4 x signed int> -> <4 x unsigned int> 4725 if (const VectorType *VTy = T->getAs<VectorType>()) 4726 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4727 VTy->getNumElements(), VTy->isAltiVec(), VTy->isPixel()); 4728 4729 // For enums, we return the unsigned version of the base type. 4730 if (const EnumType *ETy = T->getAs<EnumType>()) 4731 T = ETy->getDecl()->getIntegerType(); 4732 4733 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4734 assert(BTy && "Unexpected signed integer type"); 4735 switch (BTy->getKind()) { 4736 case BuiltinType::Char_S: 4737 case BuiltinType::SChar: 4738 return UnsignedCharTy; 4739 case BuiltinType::Short: 4740 return UnsignedShortTy; 4741 case BuiltinType::Int: 4742 return UnsignedIntTy; 4743 case BuiltinType::Long: 4744 return UnsignedLongTy; 4745 case BuiltinType::LongLong: 4746 return UnsignedLongLongTy; 4747 case BuiltinType::Int128: 4748 return UnsignedInt128Ty; 4749 default: 4750 assert(0 && "Unexpected signed integer type"); 4751 return QualType(); 4752 } 4753} 4754 4755ExternalASTSource::~ExternalASTSource() { } 4756 4757void ExternalASTSource::PrintStats() { } 4758 4759 4760//===----------------------------------------------------------------------===// 4761// Builtin Type Computation 4762//===----------------------------------------------------------------------===// 4763 4764/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4765/// pointer over the consumed characters. This returns the resultant type. 4766static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4767 ASTContext::GetBuiltinTypeError &Error, 4768 bool AllowTypeModifiers = true) { 4769 // Modifiers. 4770 int HowLong = 0; 4771 bool Signed = false, Unsigned = false; 4772 4773 // Read the modifiers first. 4774 bool Done = false; 4775 while (!Done) { 4776 switch (*Str++) { 4777 default: Done = true; --Str; break; 4778 case 'S': 4779 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4780 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4781 Signed = true; 4782 break; 4783 case 'U': 4784 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4785 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4786 Unsigned = true; 4787 break; 4788 case 'L': 4789 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4790 ++HowLong; 4791 break; 4792 } 4793 } 4794 4795 QualType Type; 4796 4797 // Read the base type. 4798 switch (*Str++) { 4799 default: assert(0 && "Unknown builtin type letter!"); 4800 case 'v': 4801 assert(HowLong == 0 && !Signed && !Unsigned && 4802 "Bad modifiers used with 'v'!"); 4803 Type = Context.VoidTy; 4804 break; 4805 case 'f': 4806 assert(HowLong == 0 && !Signed && !Unsigned && 4807 "Bad modifiers used with 'f'!"); 4808 Type = Context.FloatTy; 4809 break; 4810 case 'd': 4811 assert(HowLong < 2 && !Signed && !Unsigned && 4812 "Bad modifiers used with 'd'!"); 4813 if (HowLong) 4814 Type = Context.LongDoubleTy; 4815 else 4816 Type = Context.DoubleTy; 4817 break; 4818 case 's': 4819 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4820 if (Unsigned) 4821 Type = Context.UnsignedShortTy; 4822 else 4823 Type = Context.ShortTy; 4824 break; 4825 case 'i': 4826 if (HowLong == 3) 4827 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4828 else if (HowLong == 2) 4829 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4830 else if (HowLong == 1) 4831 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4832 else 4833 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4834 break; 4835 case 'c': 4836 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4837 if (Signed) 4838 Type = Context.SignedCharTy; 4839 else if (Unsigned) 4840 Type = Context.UnsignedCharTy; 4841 else 4842 Type = Context.CharTy; 4843 break; 4844 case 'b': // boolean 4845 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4846 Type = Context.BoolTy; 4847 break; 4848 case 'z': // size_t. 4849 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4850 Type = Context.getSizeType(); 4851 break; 4852 case 'F': 4853 Type = Context.getCFConstantStringType(); 4854 break; 4855 case 'a': 4856 Type = Context.getBuiltinVaListType(); 4857 assert(!Type.isNull() && "builtin va list type not initialized!"); 4858 break; 4859 case 'A': 4860 // This is a "reference" to a va_list; however, what exactly 4861 // this means depends on how va_list is defined. There are two 4862 // different kinds of va_list: ones passed by value, and ones 4863 // passed by reference. An example of a by-value va_list is 4864 // x86, where va_list is a char*. An example of by-ref va_list 4865 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4866 // we want this argument to be a char*&; for x86-64, we want 4867 // it to be a __va_list_tag*. 4868 Type = Context.getBuiltinVaListType(); 4869 assert(!Type.isNull() && "builtin va list type not initialized!"); 4870 if (Type->isArrayType()) { 4871 Type = Context.getArrayDecayedType(Type); 4872 } else { 4873 Type = Context.getLValueReferenceType(Type); 4874 } 4875 break; 4876 case 'V': { 4877 char *End; 4878 unsigned NumElements = strtoul(Str, &End, 10); 4879 assert(End != Str && "Missing vector size"); 4880 4881 Str = End; 4882 4883 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4884 // FIXME: Don't know what to do about AltiVec. 4885 Type = Context.getVectorType(ElementType, NumElements, false, false); 4886 break; 4887 } 4888 case 'X': { 4889 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4890 Type = Context.getComplexType(ElementType); 4891 break; 4892 } 4893 case 'P': 4894 Type = Context.getFILEType(); 4895 if (Type.isNull()) { 4896 Error = ASTContext::GE_Missing_stdio; 4897 return QualType(); 4898 } 4899 break; 4900 case 'J': 4901 if (Signed) 4902 Type = Context.getsigjmp_bufType(); 4903 else 4904 Type = Context.getjmp_bufType(); 4905 4906 if (Type.isNull()) { 4907 Error = ASTContext::GE_Missing_setjmp; 4908 return QualType(); 4909 } 4910 break; 4911 } 4912 4913 if (!AllowTypeModifiers) 4914 return Type; 4915 4916 Done = false; 4917 while (!Done) { 4918 switch (char c = *Str++) { 4919 default: Done = true; --Str; break; 4920 case '*': 4921 case '&': 4922 { 4923 // Both pointers and references can have their pointee types 4924 // qualified with an address space. 4925 char *End; 4926 unsigned AddrSpace = strtoul(Str, &End, 10); 4927 if (End != Str && AddrSpace != 0) { 4928 Type = Context.getAddrSpaceQualType(Type, AddrSpace); 4929 Str = End; 4930 } 4931 } 4932 if (c == '*') 4933 Type = Context.getPointerType(Type); 4934 else 4935 Type = Context.getLValueReferenceType(Type); 4936 break; 4937 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4938 case 'C': 4939 Type = Type.withConst(); 4940 break; 4941 case 'D': 4942 Type = Context.getVolatileType(Type); 4943 break; 4944 } 4945 } 4946 4947 return Type; 4948} 4949 4950/// GetBuiltinType - Return the type for the specified builtin. 4951QualType ASTContext::GetBuiltinType(unsigned id, 4952 GetBuiltinTypeError &Error) { 4953 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4954 4955 llvm::SmallVector<QualType, 8> ArgTypes; 4956 4957 Error = GE_None; 4958 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4959 if (Error != GE_None) 4960 return QualType(); 4961 while (TypeStr[0] && TypeStr[0] != '.') { 4962 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4963 if (Error != GE_None) 4964 return QualType(); 4965 4966 // Do array -> pointer decay. The builtin should use the decayed type. 4967 if (Ty->isArrayType()) 4968 Ty = getArrayDecayedType(Ty); 4969 4970 ArgTypes.push_back(Ty); 4971 } 4972 4973 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4974 "'.' should only occur at end of builtin type list!"); 4975 4976 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4977 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4978 return getFunctionNoProtoType(ResType); 4979 4980 // FIXME: Should we create noreturn types? 4981 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4982 TypeStr[0] == '.', 0, false, false, 0, 0, 4983 FunctionType::ExtInfo()); 4984} 4985 4986QualType 4987ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4988 // Perform the usual unary conversions. We do this early so that 4989 // integral promotions to "int" can allow us to exit early, in the 4990 // lhs == rhs check. Also, for conversion purposes, we ignore any 4991 // qualifiers. For example, "const float" and "float" are 4992 // equivalent. 4993 if (lhs->isPromotableIntegerType()) 4994 lhs = getPromotedIntegerType(lhs); 4995 else 4996 lhs = lhs.getUnqualifiedType(); 4997 if (rhs->isPromotableIntegerType()) 4998 rhs = getPromotedIntegerType(rhs); 4999 else 5000 rhs = rhs.getUnqualifiedType(); 5001 5002 // If both types are identical, no conversion is needed. 5003 if (lhs == rhs) 5004 return lhs; 5005 5006 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 5007 // The caller can deal with this (e.g. pointer + int). 5008 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 5009 return lhs; 5010 5011 // At this point, we have two different arithmetic types. 5012 5013 // Handle complex types first (C99 6.3.1.8p1). 5014 if (lhs->isComplexType() || rhs->isComplexType()) { 5015 // if we have an integer operand, the result is the complex type. 5016 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 5017 // convert the rhs to the lhs complex type. 5018 return lhs; 5019 } 5020 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 5021 // convert the lhs to the rhs complex type. 5022 return rhs; 5023 } 5024 // This handles complex/complex, complex/float, or float/complex. 5025 // When both operands are complex, the shorter operand is converted to the 5026 // type of the longer, and that is the type of the result. This corresponds 5027 // to what is done when combining two real floating-point operands. 5028 // The fun begins when size promotion occur across type domains. 5029 // From H&S 6.3.4: When one operand is complex and the other is a real 5030 // floating-point type, the less precise type is converted, within it's 5031 // real or complex domain, to the precision of the other type. For example, 5032 // when combining a "long double" with a "double _Complex", the 5033 // "double _Complex" is promoted to "long double _Complex". 5034 int result = getFloatingTypeOrder(lhs, rhs); 5035 5036 if (result > 0) { // The left side is bigger, convert rhs. 5037 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 5038 } else if (result < 0) { // The right side is bigger, convert lhs. 5039 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 5040 } 5041 // At this point, lhs and rhs have the same rank/size. Now, make sure the 5042 // domains match. This is a requirement for our implementation, C99 5043 // does not require this promotion. 5044 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 5045 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 5046 return rhs; 5047 } else { // handle "_Complex double, double". 5048 return lhs; 5049 } 5050 } 5051 return lhs; // The domain/size match exactly. 5052 } 5053 // Now handle "real" floating types (i.e. float, double, long double). 5054 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 5055 // if we have an integer operand, the result is the real floating type. 5056 if (rhs->isIntegerType()) { 5057 // convert rhs to the lhs floating point type. 5058 return lhs; 5059 } 5060 if (rhs->isComplexIntegerType()) { 5061 // convert rhs to the complex floating point type. 5062 return getComplexType(lhs); 5063 } 5064 if (lhs->isIntegerType()) { 5065 // convert lhs to the rhs floating point type. 5066 return rhs; 5067 } 5068 if (lhs->isComplexIntegerType()) { 5069 // convert lhs to the complex floating point type. 5070 return getComplexType(rhs); 5071 } 5072 // We have two real floating types, float/complex combos were handled above. 5073 // Convert the smaller operand to the bigger result. 5074 int result = getFloatingTypeOrder(lhs, rhs); 5075 if (result > 0) // convert the rhs 5076 return lhs; 5077 assert(result < 0 && "illegal float comparison"); 5078 return rhs; // convert the lhs 5079 } 5080 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 5081 // Handle GCC complex int extension. 5082 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 5083 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 5084 5085 if (lhsComplexInt && rhsComplexInt) { 5086 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 5087 rhsComplexInt->getElementType()) >= 0) 5088 return lhs; // convert the rhs 5089 return rhs; 5090 } else if (lhsComplexInt && rhs->isIntegerType()) { 5091 // convert the rhs to the lhs complex type. 5092 return lhs; 5093 } else if (rhsComplexInt && lhs->isIntegerType()) { 5094 // convert the lhs to the rhs complex type. 5095 return rhs; 5096 } 5097 } 5098 // Finally, we have two differing integer types. 5099 // The rules for this case are in C99 6.3.1.8 5100 int compare = getIntegerTypeOrder(lhs, rhs); 5101 bool lhsSigned = lhs->isSignedIntegerType(), 5102 rhsSigned = rhs->isSignedIntegerType(); 5103 QualType destType; 5104 if (lhsSigned == rhsSigned) { 5105 // Same signedness; use the higher-ranked type 5106 destType = compare >= 0 ? lhs : rhs; 5107 } else if (compare != (lhsSigned ? 1 : -1)) { 5108 // The unsigned type has greater than or equal rank to the 5109 // signed type, so use the unsigned type 5110 destType = lhsSigned ? rhs : lhs; 5111 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 5112 // The two types are different widths; if we are here, that 5113 // means the signed type is larger than the unsigned type, so 5114 // use the signed type. 5115 destType = lhsSigned ? lhs : rhs; 5116 } else { 5117 // The signed type is higher-ranked than the unsigned type, 5118 // but isn't actually any bigger (like unsigned int and long 5119 // on most 32-bit systems). Use the unsigned type corresponding 5120 // to the signed type. 5121 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 5122 } 5123 return destType; 5124} 5125