ASTContext.cpp revision 127102b5196ffe04bdb70fd553fe62c265ab10a9
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/DeclCXX.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/Expr.h" 19#include "clang/AST/ExternalASTSource.h" 20#include "clang/AST/RecordLayout.h" 21#include "clang/Basic/Builtins.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "llvm/ADT/StringExtras.h" 25#include "llvm/Support/MathExtras.h" 26#include "llvm/Support/MemoryBuffer.h" 27using namespace clang; 28 29enum FloatingRank { 30 FloatRank, DoubleRank, LongDoubleRank 31}; 32 33ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 34 TargetInfo &t, 35 IdentifierTable &idents, SelectorTable &sels, 36 Builtin::Context &builtins, 37 bool FreeMem, unsigned size_reserve) : 38 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 39 ObjCFastEnumerationStateTypeDecl(0), SourceMgr(SM), LangOpts(LOpts), 40 FreeMemory(FreeMem), Target(t), Idents(idents), Selectors(sels), 41 BuiltinInfo(builtins), ExternalSource(0) { 42 if (size_reserve > 0) Types.reserve(size_reserve); 43 InitBuiltinTypes(); 44 TUDecl = TranslationUnitDecl::Create(*this); 45 PrintingPolicy.CPlusPlus = LangOpts.CPlusPlus; 46} 47 48ASTContext::~ASTContext() { 49 // Deallocate all the types. 50 while (!Types.empty()) { 51 Types.back()->Destroy(*this); 52 Types.pop_back(); 53 } 54 55 { 56 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 57 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 58 while (I != E) { 59 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 60 delete R; 61 } 62 } 63 64 { 65 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 66 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 67 while (I != E) { 68 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 69 delete R; 70 } 71 } 72 73 // Destroy nested-name-specifiers. 74 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 75 NNS = NestedNameSpecifiers.begin(), 76 NNSEnd = NestedNameSpecifiers.end(); 77 NNS != NNSEnd; 78 /* Increment in loop */) 79 (*NNS++).Destroy(*this); 80 81 if (GlobalNestedNameSpecifier) 82 GlobalNestedNameSpecifier->Destroy(*this); 83 84 TUDecl->Destroy(*this); 85} 86 87void 88ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 89 ExternalSource.reset(Source.take()); 90} 91 92void ASTContext::PrintStats() const { 93 fprintf(stderr, "*** AST Context Stats:\n"); 94 fprintf(stderr, " %d types total.\n", (int)Types.size()); 95 96 unsigned counts[] = { 97#define TYPE(Name, Parent) 0, 98#define ABSTRACT_TYPE(Name, Parent) 99#include "clang/AST/TypeNodes.def" 100 0 // Extra 101 }; 102 103 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 104 Type *T = Types[i]; 105 counts[(unsigned)T->getTypeClass()]++; 106 } 107 108 unsigned Idx = 0; 109 unsigned TotalBytes = 0; 110#define TYPE(Name, Parent) \ 111 if (counts[Idx]) \ 112 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 113 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 114 ++Idx; 115#define ABSTRACT_TYPE(Name, Parent) 116#include "clang/AST/TypeNodes.def" 117 118 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 119 120 if (ExternalSource.get()) { 121 fprintf(stderr, "\n"); 122 ExternalSource->PrintStats(); 123 } 124} 125 126 127void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 128 Types.push_back((R = QualType(new (*this,8) BuiltinType(K),0)).getTypePtr()); 129} 130 131void ASTContext::InitBuiltinTypes() { 132 assert(VoidTy.isNull() && "Context reinitialized?"); 133 134 // C99 6.2.5p19. 135 InitBuiltinType(VoidTy, BuiltinType::Void); 136 137 // C99 6.2.5p2. 138 InitBuiltinType(BoolTy, BuiltinType::Bool); 139 // C99 6.2.5p3. 140 if (LangOpts.CharIsSigned) 141 InitBuiltinType(CharTy, BuiltinType::Char_S); 142 else 143 InitBuiltinType(CharTy, BuiltinType::Char_U); 144 // C99 6.2.5p4. 145 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 146 InitBuiltinType(ShortTy, BuiltinType::Short); 147 InitBuiltinType(IntTy, BuiltinType::Int); 148 InitBuiltinType(LongTy, BuiltinType::Long); 149 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 150 151 // C99 6.2.5p6. 152 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 153 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 154 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 155 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 156 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 157 158 // C99 6.2.5p10. 159 InitBuiltinType(FloatTy, BuiltinType::Float); 160 InitBuiltinType(DoubleTy, BuiltinType::Double); 161 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 162 163 // GNU extension, 128-bit integers. 164 InitBuiltinType(Int128Ty, BuiltinType::Int128); 165 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 166 167 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 168 InitBuiltinType(WCharTy, BuiltinType::WChar); 169 else // C99 170 WCharTy = getFromTargetType(Target.getWCharType()); 171 172 // Placeholder type for functions. 173 InitBuiltinType(OverloadTy, BuiltinType::Overload); 174 175 // Placeholder type for type-dependent expressions whose type is 176 // completely unknown. No code should ever check a type against 177 // DependentTy and users should never see it; however, it is here to 178 // help diagnose failures to properly check for type-dependent 179 // expressions. 180 InitBuiltinType(DependentTy, BuiltinType::Dependent); 181 182 // Placeholder type for C++0x auto declarations whose real type has 183 // not yet been deduced. 184 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 185 186 // C99 6.2.5p11. 187 FloatComplexTy = getComplexType(FloatTy); 188 DoubleComplexTy = getComplexType(DoubleTy); 189 LongDoubleComplexTy = getComplexType(LongDoubleTy); 190 191 BuiltinVaListType = QualType(); 192 ObjCIdType = QualType(); 193 IdStructType = 0; 194 ObjCClassType = QualType(); 195 ClassStructType = 0; 196 197 ObjCConstantStringType = QualType(); 198 199 // void * type 200 VoidPtrTy = getPointerType(VoidTy); 201 202 // nullptr type (C++0x 2.14.7) 203 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 204} 205 206//===----------------------------------------------------------------------===// 207// Type Sizing and Analysis 208//===----------------------------------------------------------------------===// 209 210/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 211/// scalar floating point type. 212const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 213 const BuiltinType *BT = T->getAsBuiltinType(); 214 assert(BT && "Not a floating point type!"); 215 switch (BT->getKind()) { 216 default: assert(0 && "Not a floating point type!"); 217 case BuiltinType::Float: return Target.getFloatFormat(); 218 case BuiltinType::Double: return Target.getDoubleFormat(); 219 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 220 } 221} 222 223/// getDeclAlign - Return a conservative estimate of the alignment of the 224/// specified decl. Note that bitfields do not have a valid alignment, so 225/// this method will assert on them. 226unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 227 unsigned Align = Target.getCharWidth(); 228 229 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>(*this)) 230 Align = std::max(Align, AA->getAlignment()); 231 232 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 233 QualType T = VD->getType(); 234 if (const ReferenceType* RT = T->getAsReferenceType()) { 235 unsigned AS = RT->getPointeeType().getAddressSpace(); 236 Align = Target.getPointerAlign(AS); 237 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 238 // Incomplete or function types default to 1. 239 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 240 T = cast<ArrayType>(T)->getElementType(); 241 242 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 243 } 244 } 245 246 return Align / Target.getCharWidth(); 247} 248 249/// getTypeSize - Return the size of the specified type, in bits. This method 250/// does not work on incomplete types. 251std::pair<uint64_t, unsigned> 252ASTContext::getTypeInfo(const Type *T) { 253 uint64_t Width=0; 254 unsigned Align=8; 255 switch (T->getTypeClass()) { 256#define TYPE(Class, Base) 257#define ABSTRACT_TYPE(Class, Base) 258#define NON_CANONICAL_TYPE(Class, Base) 259#define DEPENDENT_TYPE(Class, Base) case Type::Class: 260#include "clang/AST/TypeNodes.def" 261 assert(false && "Should not see dependent types"); 262 break; 263 264 case Type::FunctionNoProto: 265 case Type::FunctionProto: 266 // GCC extension: alignof(function) = 32 bits 267 Width = 0; 268 Align = 32; 269 break; 270 271 case Type::IncompleteArray: 272 case Type::VariableArray: 273 Width = 0; 274 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 275 break; 276 277 case Type::ConstantArray: { 278 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 279 280 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 281 Width = EltInfo.first*CAT->getSize().getZExtValue(); 282 Align = EltInfo.second; 283 break; 284 } 285 case Type::ExtVector: 286 case Type::Vector: { 287 std::pair<uint64_t, unsigned> EltInfo = 288 getTypeInfo(cast<VectorType>(T)->getElementType()); 289 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 290 Align = Width; 291 // If the alignment is not a power of 2, round up to the next power of 2. 292 // This happens for non-power-of-2 length vectors. 293 // FIXME: this should probably be a target property. 294 Align = 1 << llvm::Log2_32_Ceil(Align); 295 break; 296 } 297 298 case Type::Builtin: 299 switch (cast<BuiltinType>(T)->getKind()) { 300 default: assert(0 && "Unknown builtin type!"); 301 case BuiltinType::Void: 302 // GCC extension: alignof(void) = 8 bits. 303 Width = 0; 304 Align = 8; 305 break; 306 307 case BuiltinType::Bool: 308 Width = Target.getBoolWidth(); 309 Align = Target.getBoolAlign(); 310 break; 311 case BuiltinType::Char_S: 312 case BuiltinType::Char_U: 313 case BuiltinType::UChar: 314 case BuiltinType::SChar: 315 Width = Target.getCharWidth(); 316 Align = Target.getCharAlign(); 317 break; 318 case BuiltinType::WChar: 319 Width = Target.getWCharWidth(); 320 Align = Target.getWCharAlign(); 321 break; 322 case BuiltinType::UShort: 323 case BuiltinType::Short: 324 Width = Target.getShortWidth(); 325 Align = Target.getShortAlign(); 326 break; 327 case BuiltinType::UInt: 328 case BuiltinType::Int: 329 Width = Target.getIntWidth(); 330 Align = Target.getIntAlign(); 331 break; 332 case BuiltinType::ULong: 333 case BuiltinType::Long: 334 Width = Target.getLongWidth(); 335 Align = Target.getLongAlign(); 336 break; 337 case BuiltinType::ULongLong: 338 case BuiltinType::LongLong: 339 Width = Target.getLongLongWidth(); 340 Align = Target.getLongLongAlign(); 341 break; 342 case BuiltinType::Int128: 343 case BuiltinType::UInt128: 344 Width = 128; 345 Align = 128; // int128_t is 128-bit aligned on all targets. 346 break; 347 case BuiltinType::Float: 348 Width = Target.getFloatWidth(); 349 Align = Target.getFloatAlign(); 350 break; 351 case BuiltinType::Double: 352 Width = Target.getDoubleWidth(); 353 Align = Target.getDoubleAlign(); 354 break; 355 case BuiltinType::LongDouble: 356 Width = Target.getLongDoubleWidth(); 357 Align = Target.getLongDoubleAlign(); 358 break; 359 case BuiltinType::NullPtr: 360 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 361 Align = Target.getPointerAlign(0); // == sizeof(void*) 362 break; 363 } 364 break; 365 case Type::FixedWidthInt: 366 // FIXME: This isn't precisely correct; the width/alignment should depend 367 // on the available types for the target 368 Width = cast<FixedWidthIntType>(T)->getWidth(); 369 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 370 Align = Width; 371 break; 372 case Type::ExtQual: 373 // FIXME: Pointers into different addr spaces could have different sizes and 374 // alignment requirements: getPointerInfo should take an AddrSpace. 375 return getTypeInfo(QualType(cast<ExtQualType>(T)->getBaseType(), 0)); 376 case Type::ObjCObjectPointer: 377 case Type::ObjCQualifiedInterface: 378 Width = Target.getPointerWidth(0); 379 Align = Target.getPointerAlign(0); 380 break; 381 case Type::BlockPointer: { 382 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 383 Width = Target.getPointerWidth(AS); 384 Align = Target.getPointerAlign(AS); 385 break; 386 } 387 case Type::Pointer: { 388 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 389 Width = Target.getPointerWidth(AS); 390 Align = Target.getPointerAlign(AS); 391 break; 392 } 393 case Type::LValueReference: 394 case Type::RValueReference: 395 // "When applied to a reference or a reference type, the result is the size 396 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 397 // FIXME: This is wrong for struct layout: a reference in a struct has 398 // pointer size. 399 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 400 case Type::MemberPointer: { 401 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 402 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 403 // If we ever want to support other ABIs this needs to be abstracted. 404 405 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 406 std::pair<uint64_t, unsigned> PtrDiffInfo = 407 getTypeInfo(getPointerDiffType()); 408 Width = PtrDiffInfo.first; 409 if (Pointee->isFunctionType()) 410 Width *= 2; 411 Align = PtrDiffInfo.second; 412 break; 413 } 414 case Type::Complex: { 415 // Complex types have the same alignment as their elements, but twice the 416 // size. 417 std::pair<uint64_t, unsigned> EltInfo = 418 getTypeInfo(cast<ComplexType>(T)->getElementType()); 419 Width = EltInfo.first*2; 420 Align = EltInfo.second; 421 break; 422 } 423 case Type::ObjCInterface: { 424 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 425 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 426 Width = Layout.getSize(); 427 Align = Layout.getAlignment(); 428 break; 429 } 430 case Type::Record: 431 case Type::Enum: { 432 const TagType *TT = cast<TagType>(T); 433 434 if (TT->getDecl()->isInvalidDecl()) { 435 Width = 1; 436 Align = 1; 437 break; 438 } 439 440 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 441 return getTypeInfo(ET->getDecl()->getIntegerType()); 442 443 const RecordType *RT = cast<RecordType>(TT); 444 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 445 Width = Layout.getSize(); 446 Align = Layout.getAlignment(); 447 break; 448 } 449 450 case Type::Typedef: { 451 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 452 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>(*this)) { 453 Align = Aligned->getAlignment(); 454 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 455 } else 456 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 457 break; 458 } 459 460 case Type::TypeOfExpr: 461 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 462 .getTypePtr()); 463 464 case Type::TypeOf: 465 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 466 467 case Type::Decltype: 468 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 469 .getTypePtr()); 470 471 case Type::QualifiedName: 472 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 473 474 case Type::TemplateSpecialization: 475 assert(getCanonicalType(T) != T && 476 "Cannot request the size of a dependent type"); 477 // FIXME: this is likely to be wrong once we support template 478 // aliases, since a template alias could refer to a typedef that 479 // has an __aligned__ attribute on it. 480 return getTypeInfo(getCanonicalType(T)); 481 } 482 483 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 484 return std::make_pair(Width, Align); 485} 486 487/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 488/// type for the current target in bits. This can be different than the ABI 489/// alignment in cases where it is beneficial for performance to overalign 490/// a data type. 491unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 492 unsigned ABIAlign = getTypeAlign(T); 493 494 // Double and long long should be naturally aligned if possible. 495 if (const ComplexType* CT = T->getAsComplexType()) 496 T = CT->getElementType().getTypePtr(); 497 if (T->isSpecificBuiltinType(BuiltinType::Double) || 498 T->isSpecificBuiltinType(BuiltinType::LongLong)) 499 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 500 501 return ABIAlign; 502} 503 504 505/// LayoutField - Field layout. 506void ASTRecordLayout::LayoutField(const FieldDecl *FD, unsigned FieldNo, 507 bool IsUnion, unsigned StructPacking, 508 ASTContext &Context) { 509 unsigned FieldPacking = StructPacking; 510 uint64_t FieldOffset = IsUnion ? 0 : Size; 511 uint64_t FieldSize; 512 unsigned FieldAlign; 513 514 // FIXME: Should this override struct packing? Probably we want to 515 // take the minimum? 516 if (const PackedAttr *PA = FD->getAttr<PackedAttr>(Context)) 517 FieldPacking = PA->getAlignment(); 518 519 if (const Expr *BitWidthExpr = FD->getBitWidth()) { 520 // TODO: Need to check this algorithm on other targets! 521 // (tested on Linux-X86) 522 FieldSize = BitWidthExpr->EvaluateAsInt(Context).getZExtValue(); 523 524 std::pair<uint64_t, unsigned> FieldInfo = 525 Context.getTypeInfo(FD->getType()); 526 uint64_t TypeSize = FieldInfo.first; 527 528 // Determine the alignment of this bitfield. The packing 529 // attributes define a maximum and the alignment attribute defines 530 // a minimum. 531 // FIXME: What is the right behavior when the specified alignment 532 // is smaller than the specified packing? 533 FieldAlign = FieldInfo.second; 534 if (FieldPacking) 535 FieldAlign = std::min(FieldAlign, FieldPacking); 536 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>(Context)) 537 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 538 539 // Check if we need to add padding to give the field the correct 540 // alignment. 541 if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize) 542 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 543 544 // Padding members don't affect overall alignment 545 if (!FD->getIdentifier()) 546 FieldAlign = 1; 547 } else { 548 if (FD->getType()->isIncompleteArrayType()) { 549 // This is a flexible array member; we can't directly 550 // query getTypeInfo about these, so we figure it out here. 551 // Flexible array members don't have any size, but they 552 // have to be aligned appropriately for their element type. 553 FieldSize = 0; 554 const ArrayType* ATy = Context.getAsArrayType(FD->getType()); 555 FieldAlign = Context.getTypeAlign(ATy->getElementType()); 556 } else if (const ReferenceType *RT = FD->getType()->getAsReferenceType()) { 557 unsigned AS = RT->getPointeeType().getAddressSpace(); 558 FieldSize = Context.Target.getPointerWidth(AS); 559 FieldAlign = Context.Target.getPointerAlign(AS); 560 } else { 561 std::pair<uint64_t, unsigned> FieldInfo = 562 Context.getTypeInfo(FD->getType()); 563 FieldSize = FieldInfo.first; 564 FieldAlign = FieldInfo.second; 565 } 566 567 // Determine the alignment of this bitfield. The packing 568 // attributes define a maximum and the alignment attribute defines 569 // a minimum. Additionally, the packing alignment must be at least 570 // a byte for non-bitfields. 571 // 572 // FIXME: What is the right behavior when the specified alignment 573 // is smaller than the specified packing? 574 if (FieldPacking) 575 FieldAlign = std::min(FieldAlign, std::max(8U, FieldPacking)); 576 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>(Context)) 577 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 578 579 // Round up the current record size to the field's alignment boundary. 580 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 581 } 582 583 // Place this field at the current location. 584 FieldOffsets[FieldNo] = FieldOffset; 585 586 // Reserve space for this field. 587 if (IsUnion) { 588 Size = std::max(Size, FieldSize); 589 } else { 590 Size = FieldOffset + FieldSize; 591 } 592 593 // Remember the next available offset. 594 NextOffset = Size; 595 596 // Remember max struct/class alignment. 597 Alignment = std::max(Alignment, FieldAlign); 598} 599 600static void CollectLocalObjCIvars(ASTContext *Ctx, 601 const ObjCInterfaceDecl *OI, 602 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 603 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 604 E = OI->ivar_end(); I != E; ++I) { 605 ObjCIvarDecl *IVDecl = *I; 606 if (!IVDecl->isInvalidDecl()) 607 Fields.push_back(cast<FieldDecl>(IVDecl)); 608 } 609} 610 611void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 612 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 613 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 614 CollectObjCIvars(SuperClass, Fields); 615 CollectLocalObjCIvars(this, OI, Fields); 616} 617 618/// ShallowCollectObjCIvars - 619/// Collect all ivars, including those synthesized, in the current class. 620/// 621void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 622 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 623 bool CollectSynthesized) { 624 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 625 E = OI->ivar_end(); I != E; ++I) { 626 Ivars.push_back(*I); 627 } 628 if (CollectSynthesized) 629 CollectSynthesizedIvars(OI, Ivars); 630} 631 632void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 633 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 634 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(*this), 635 E = PD->prop_end(*this); I != E; ++I) 636 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 637 Ivars.push_back(Ivar); 638 639 // Also look into nested protocols. 640 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 641 E = PD->protocol_end(); P != E; ++P) 642 CollectProtocolSynthesizedIvars(*P, Ivars); 643} 644 645/// CollectSynthesizedIvars - 646/// This routine collect synthesized ivars for the designated class. 647/// 648void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 649 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 650 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(*this), 651 E = OI->prop_end(*this); I != E; ++I) { 652 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 653 Ivars.push_back(Ivar); 654 } 655 // Also look into interface's protocol list for properties declared 656 // in the protocol and whose ivars are synthesized. 657 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 658 PE = OI->protocol_end(); P != PE; ++P) { 659 ObjCProtocolDecl *PD = (*P); 660 CollectProtocolSynthesizedIvars(PD, Ivars); 661 } 662} 663 664unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 665 unsigned count = 0; 666 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(*this), 667 E = PD->prop_end(*this); I != E; ++I) 668 if ((*I)->getPropertyIvarDecl()) 669 ++count; 670 671 // Also look into nested protocols. 672 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 673 E = PD->protocol_end(); P != E; ++P) 674 count += CountProtocolSynthesizedIvars(*P); 675 return count; 676} 677 678unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) 679{ 680 unsigned count = 0; 681 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(*this), 682 E = OI->prop_end(*this); I != E; ++I) { 683 if ((*I)->getPropertyIvarDecl()) 684 ++count; 685 } 686 // Also look into interface's protocol list for properties declared 687 // in the protocol and whose ivars are synthesized. 688 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 689 PE = OI->protocol_end(); P != PE; ++P) { 690 ObjCProtocolDecl *PD = (*P); 691 count += CountProtocolSynthesizedIvars(PD); 692 } 693 return count; 694} 695 696/// getInterfaceLayoutImpl - Get or compute information about the 697/// layout of the given interface. 698/// 699/// \param Impl - If given, also include the layout of the interface's 700/// implementation. This may differ by including synthesized ivars. 701const ASTRecordLayout & 702ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 703 const ObjCImplementationDecl *Impl) { 704 assert(!D->isForwardDecl() && "Invalid interface decl!"); 705 706 // Look up this layout, if already laid out, return what we have. 707 ObjCContainerDecl *Key = 708 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 709 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 710 return *Entry; 711 712 unsigned FieldCount = D->ivar_size(); 713 // Add in synthesized ivar count if laying out an implementation. 714 if (Impl) { 715 unsigned SynthCount = CountSynthesizedIvars(D); 716 FieldCount += SynthCount; 717 // If there aren't any sythesized ivars then reuse the interface 718 // entry. Note we can't cache this because we simply free all 719 // entries later; however we shouldn't look up implementations 720 // frequently. 721 if (SynthCount == 0) 722 return getObjCLayout(D, 0); 723 } 724 725 ASTRecordLayout *NewEntry = NULL; 726 if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 727 const ASTRecordLayout &SL = getASTObjCInterfaceLayout(SD); 728 unsigned Alignment = SL.getAlignment(); 729 730 // We start laying out ivars not at the end of the superclass 731 // structure, but at the next byte following the last field. 732 uint64_t Size = llvm::RoundUpToAlignment(SL.NextOffset, 8); 733 734 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(Size, Alignment); 735 NewEntry->InitializeLayout(FieldCount); 736 } else { 737 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(); 738 NewEntry->InitializeLayout(FieldCount); 739 } 740 741 unsigned StructPacking = 0; 742 if (const PackedAttr *PA = D->getAttr<PackedAttr>(*this)) 743 StructPacking = PA->getAlignment(); 744 745 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>(*this)) 746 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 747 AA->getAlignment())); 748 749 // Layout each ivar sequentially. 750 unsigned i = 0; 751 llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; 752 ShallowCollectObjCIvars(D, Ivars, Impl); 753 for (unsigned k = 0, e = Ivars.size(); k != e; ++k) 754 NewEntry->LayoutField(Ivars[k], i++, false, StructPacking, *this); 755 756 // Finally, round the size of the total struct up to the alignment of the 757 // struct itself. 758 NewEntry->FinalizeLayout(); 759 return *NewEntry; 760} 761 762const ASTRecordLayout & 763ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 764 return getObjCLayout(D, 0); 765} 766 767const ASTRecordLayout & 768ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 769 return getObjCLayout(D->getClassInterface(), D); 770} 771 772/// getASTRecordLayout - Get or compute information about the layout of the 773/// specified record (struct/union/class), which indicates its size and field 774/// position information. 775const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 776 D = D->getDefinition(*this); 777 assert(D && "Cannot get layout of forward declarations!"); 778 779 // Look up this layout, if already laid out, return what we have. 780 const ASTRecordLayout *&Entry = ASTRecordLayouts[D]; 781 if (Entry) return *Entry; 782 783 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 784 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 785 ASTRecordLayout *NewEntry = new ASTRecordLayout(); 786 Entry = NewEntry; 787 788 // FIXME: Avoid linear walk through the fields, if possible. 789 NewEntry->InitializeLayout(std::distance(D->field_begin(*this), 790 D->field_end(*this))); 791 bool IsUnion = D->isUnion(); 792 793 unsigned StructPacking = 0; 794 if (const PackedAttr *PA = D->getAttr<PackedAttr>(*this)) 795 StructPacking = PA->getAlignment(); 796 797 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>(*this)) 798 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 799 AA->getAlignment())); 800 801 // Layout each field, for now, just sequentially, respecting alignment. In 802 // the future, this will need to be tweakable by targets. 803 unsigned FieldIdx = 0; 804 for (RecordDecl::field_iterator Field = D->field_begin(*this), 805 FieldEnd = D->field_end(*this); 806 Field != FieldEnd; (void)++Field, ++FieldIdx) 807 NewEntry->LayoutField(*Field, FieldIdx, IsUnion, StructPacking, *this); 808 809 // Finally, round the size of the total struct up to the alignment of the 810 // struct itself. 811 NewEntry->FinalizeLayout(getLangOptions().CPlusPlus); 812 return *NewEntry; 813} 814 815//===----------------------------------------------------------------------===// 816// Type creation/memoization methods 817//===----------------------------------------------------------------------===// 818 819QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 820 QualType CanT = getCanonicalType(T); 821 if (CanT.getAddressSpace() == AddressSpace) 822 return T; 823 824 // If we are composing extended qualifiers together, merge together into one 825 // ExtQualType node. 826 unsigned CVRQuals = T.getCVRQualifiers(); 827 QualType::GCAttrTypes GCAttr = QualType::GCNone; 828 Type *TypeNode = T.getTypePtr(); 829 830 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 831 // If this type already has an address space specified, it cannot get 832 // another one. 833 assert(EQT->getAddressSpace() == 0 && 834 "Type cannot be in multiple addr spaces!"); 835 GCAttr = EQT->getObjCGCAttr(); 836 TypeNode = EQT->getBaseType(); 837 } 838 839 // Check if we've already instantiated this type. 840 llvm::FoldingSetNodeID ID; 841 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 842 void *InsertPos = 0; 843 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 844 return QualType(EXTQy, CVRQuals); 845 846 // If the base type isn't canonical, this won't be a canonical type either, 847 // so fill in the canonical type field. 848 QualType Canonical; 849 if (!TypeNode->isCanonical()) { 850 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 851 852 // Update InsertPos, the previous call could have invalidated it. 853 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 854 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 855 } 856 ExtQualType *New = 857 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 858 ExtQualTypes.InsertNode(New, InsertPos); 859 Types.push_back(New); 860 return QualType(New, CVRQuals); 861} 862 863QualType ASTContext::getObjCGCQualType(QualType T, 864 QualType::GCAttrTypes GCAttr) { 865 QualType CanT = getCanonicalType(T); 866 if (CanT.getObjCGCAttr() == GCAttr) 867 return T; 868 869 if (T->isPointerType()) { 870 QualType Pointee = T->getAsPointerType()->getPointeeType(); 871 if (Pointee->isPointerType()) { 872 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 873 return getPointerType(ResultType); 874 } 875 } 876 // If we are composing extended qualifiers together, merge together into one 877 // ExtQualType node. 878 unsigned CVRQuals = T.getCVRQualifiers(); 879 Type *TypeNode = T.getTypePtr(); 880 unsigned AddressSpace = 0; 881 882 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 883 // If this type already has an address space specified, it cannot get 884 // another one. 885 assert(EQT->getObjCGCAttr() == QualType::GCNone && 886 "Type cannot be in multiple addr spaces!"); 887 AddressSpace = EQT->getAddressSpace(); 888 TypeNode = EQT->getBaseType(); 889 } 890 891 // Check if we've already instantiated an gc qual'd type of this type. 892 llvm::FoldingSetNodeID ID; 893 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 894 void *InsertPos = 0; 895 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 896 return QualType(EXTQy, CVRQuals); 897 898 // If the base type isn't canonical, this won't be a canonical type either, 899 // so fill in the canonical type field. 900 // FIXME: Isn't this also not canonical if the base type is a array 901 // or pointer type? I can't find any documentation for objc_gc, though... 902 QualType Canonical; 903 if (!T->isCanonical()) { 904 Canonical = getObjCGCQualType(CanT, GCAttr); 905 906 // Update InsertPos, the previous call could have invalidated it. 907 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 908 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 909 } 910 ExtQualType *New = 911 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 912 ExtQualTypes.InsertNode(New, InsertPos); 913 Types.push_back(New); 914 return QualType(New, CVRQuals); 915} 916 917/// getComplexType - Return the uniqued reference to the type for a complex 918/// number with the specified element type. 919QualType ASTContext::getComplexType(QualType T) { 920 // Unique pointers, to guarantee there is only one pointer of a particular 921 // structure. 922 llvm::FoldingSetNodeID ID; 923 ComplexType::Profile(ID, T); 924 925 void *InsertPos = 0; 926 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 927 return QualType(CT, 0); 928 929 // If the pointee type isn't canonical, this won't be a canonical type either, 930 // so fill in the canonical type field. 931 QualType Canonical; 932 if (!T->isCanonical()) { 933 Canonical = getComplexType(getCanonicalType(T)); 934 935 // Get the new insert position for the node we care about. 936 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 937 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 938 } 939 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 940 Types.push_back(New); 941 ComplexTypes.InsertNode(New, InsertPos); 942 return QualType(New, 0); 943} 944 945QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 946 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 947 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 948 FixedWidthIntType *&Entry = Map[Width]; 949 if (!Entry) 950 Entry = new FixedWidthIntType(Width, Signed); 951 return QualType(Entry, 0); 952} 953 954/// getPointerType - Return the uniqued reference to the type for a pointer to 955/// the specified type. 956QualType ASTContext::getPointerType(QualType T) { 957 // Unique pointers, to guarantee there is only one pointer of a particular 958 // structure. 959 llvm::FoldingSetNodeID ID; 960 PointerType::Profile(ID, T); 961 962 void *InsertPos = 0; 963 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 964 return QualType(PT, 0); 965 966 // If the pointee type isn't canonical, this won't be a canonical type either, 967 // so fill in the canonical type field. 968 QualType Canonical; 969 if (!T->isCanonical()) { 970 Canonical = getPointerType(getCanonicalType(T)); 971 972 // Get the new insert position for the node we care about. 973 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 974 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 975 } 976 PointerType *New = new (*this,8) PointerType(T, Canonical); 977 Types.push_back(New); 978 PointerTypes.InsertNode(New, InsertPos); 979 return QualType(New, 0); 980} 981 982/// getBlockPointerType - Return the uniqued reference to the type for 983/// a pointer to the specified block. 984QualType ASTContext::getBlockPointerType(QualType T) { 985 assert(T->isFunctionType() && "block of function types only"); 986 // Unique pointers, to guarantee there is only one block of a particular 987 // structure. 988 llvm::FoldingSetNodeID ID; 989 BlockPointerType::Profile(ID, T); 990 991 void *InsertPos = 0; 992 if (BlockPointerType *PT = 993 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 994 return QualType(PT, 0); 995 996 // If the block pointee type isn't canonical, this won't be a canonical 997 // type either so fill in the canonical type field. 998 QualType Canonical; 999 if (!T->isCanonical()) { 1000 Canonical = getBlockPointerType(getCanonicalType(T)); 1001 1002 // Get the new insert position for the node we care about. 1003 BlockPointerType *NewIP = 1004 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1005 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1006 } 1007 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 1008 Types.push_back(New); 1009 BlockPointerTypes.InsertNode(New, InsertPos); 1010 return QualType(New, 0); 1011} 1012 1013/// getLValueReferenceType - Return the uniqued reference to the type for an 1014/// lvalue reference to the specified type. 1015QualType ASTContext::getLValueReferenceType(QualType T) { 1016 // Unique pointers, to guarantee there is only one pointer of a particular 1017 // structure. 1018 llvm::FoldingSetNodeID ID; 1019 ReferenceType::Profile(ID, T); 1020 1021 void *InsertPos = 0; 1022 if (LValueReferenceType *RT = 1023 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1024 return QualType(RT, 0); 1025 1026 // If the referencee type isn't canonical, this won't be a canonical type 1027 // either, so fill in the canonical type field. 1028 QualType Canonical; 1029 if (!T->isCanonical()) { 1030 Canonical = getLValueReferenceType(getCanonicalType(T)); 1031 1032 // Get the new insert position for the node we care about. 1033 LValueReferenceType *NewIP = 1034 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1035 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1036 } 1037 1038 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 1039 Types.push_back(New); 1040 LValueReferenceTypes.InsertNode(New, InsertPos); 1041 return QualType(New, 0); 1042} 1043 1044/// getRValueReferenceType - Return the uniqued reference to the type for an 1045/// rvalue reference to the specified type. 1046QualType ASTContext::getRValueReferenceType(QualType T) { 1047 // Unique pointers, to guarantee there is only one pointer of a particular 1048 // structure. 1049 llvm::FoldingSetNodeID ID; 1050 ReferenceType::Profile(ID, T); 1051 1052 void *InsertPos = 0; 1053 if (RValueReferenceType *RT = 1054 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1055 return QualType(RT, 0); 1056 1057 // If the referencee type isn't canonical, this won't be a canonical type 1058 // either, so fill in the canonical type field. 1059 QualType Canonical; 1060 if (!T->isCanonical()) { 1061 Canonical = getRValueReferenceType(getCanonicalType(T)); 1062 1063 // Get the new insert position for the node we care about. 1064 RValueReferenceType *NewIP = 1065 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1066 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1067 } 1068 1069 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 1070 Types.push_back(New); 1071 RValueReferenceTypes.InsertNode(New, InsertPos); 1072 return QualType(New, 0); 1073} 1074 1075/// getMemberPointerType - Return the uniqued reference to the type for a 1076/// member pointer to the specified type, in the specified class. 1077QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1078{ 1079 // Unique pointers, to guarantee there is only one pointer of a particular 1080 // structure. 1081 llvm::FoldingSetNodeID ID; 1082 MemberPointerType::Profile(ID, T, Cls); 1083 1084 void *InsertPos = 0; 1085 if (MemberPointerType *PT = 1086 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1087 return QualType(PT, 0); 1088 1089 // If the pointee or class type isn't canonical, this won't be a canonical 1090 // type either, so fill in the canonical type field. 1091 QualType Canonical; 1092 if (!T->isCanonical()) { 1093 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1094 1095 // Get the new insert position for the node we care about. 1096 MemberPointerType *NewIP = 1097 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1098 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1099 } 1100 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1101 Types.push_back(New); 1102 MemberPointerTypes.InsertNode(New, InsertPos); 1103 return QualType(New, 0); 1104} 1105 1106/// getConstantArrayType - Return the unique reference to the type for an 1107/// array of the specified element type. 1108QualType ASTContext::getConstantArrayType(QualType EltTy, 1109 const llvm::APInt &ArySizeIn, 1110 ArrayType::ArraySizeModifier ASM, 1111 unsigned EltTypeQuals) { 1112 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1113 "Constant array of VLAs is illegal!"); 1114 1115 // Convert the array size into a canonical width matching the pointer size for 1116 // the target. 1117 llvm::APInt ArySize(ArySizeIn); 1118 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1119 1120 llvm::FoldingSetNodeID ID; 1121 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1122 1123 void *InsertPos = 0; 1124 if (ConstantArrayType *ATP = 1125 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1126 return QualType(ATP, 0); 1127 1128 // If the element type isn't canonical, this won't be a canonical type either, 1129 // so fill in the canonical type field. 1130 QualType Canonical; 1131 if (!EltTy->isCanonical()) { 1132 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1133 ASM, EltTypeQuals); 1134 // Get the new insert position for the node we care about. 1135 ConstantArrayType *NewIP = 1136 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1137 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1138 } 1139 1140 ConstantArrayType *New = 1141 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1142 ConstantArrayTypes.InsertNode(New, InsertPos); 1143 Types.push_back(New); 1144 return QualType(New, 0); 1145} 1146 1147/// getVariableArrayType - Returns a non-unique reference to the type for a 1148/// variable array of the specified element type. 1149QualType ASTContext::getVariableArrayType(QualType EltTy, Expr *NumElts, 1150 ArrayType::ArraySizeModifier ASM, 1151 unsigned EltTypeQuals) { 1152 // Since we don't unique expressions, it isn't possible to unique VLA's 1153 // that have an expression provided for their size. 1154 1155 VariableArrayType *New = 1156 new(*this,8)VariableArrayType(EltTy,QualType(), NumElts, ASM, EltTypeQuals); 1157 1158 VariableArrayTypes.push_back(New); 1159 Types.push_back(New); 1160 return QualType(New, 0); 1161} 1162 1163/// getDependentSizedArrayType - Returns a non-unique reference to 1164/// the type for a dependently-sized array of the specified element 1165/// type. FIXME: We will need these to be uniqued, or at least 1166/// comparable, at some point. 1167QualType ASTContext::getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 1168 ArrayType::ArraySizeModifier ASM, 1169 unsigned EltTypeQuals) { 1170 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1171 "Size must be type- or value-dependent!"); 1172 1173 // Since we don't unique expressions, it isn't possible to unique 1174 // dependently-sized array types. 1175 1176 DependentSizedArrayType *New = 1177 new (*this,8) DependentSizedArrayType(EltTy, QualType(), NumElts, 1178 ASM, EltTypeQuals); 1179 1180 DependentSizedArrayTypes.push_back(New); 1181 Types.push_back(New); 1182 return QualType(New, 0); 1183} 1184 1185QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1186 ArrayType::ArraySizeModifier ASM, 1187 unsigned EltTypeQuals) { 1188 llvm::FoldingSetNodeID ID; 1189 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1190 1191 void *InsertPos = 0; 1192 if (IncompleteArrayType *ATP = 1193 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1194 return QualType(ATP, 0); 1195 1196 // If the element type isn't canonical, this won't be a canonical type 1197 // either, so fill in the canonical type field. 1198 QualType Canonical; 1199 1200 if (!EltTy->isCanonical()) { 1201 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1202 ASM, EltTypeQuals); 1203 1204 // Get the new insert position for the node we care about. 1205 IncompleteArrayType *NewIP = 1206 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1207 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1208 } 1209 1210 IncompleteArrayType *New = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1211 ASM, EltTypeQuals); 1212 1213 IncompleteArrayTypes.InsertNode(New, InsertPos); 1214 Types.push_back(New); 1215 return QualType(New, 0); 1216} 1217 1218/// getVectorType - Return the unique reference to a vector type of 1219/// the specified element type and size. VectorType must be a built-in type. 1220QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1221 BuiltinType *baseType; 1222 1223 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1224 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1225 1226 // Check if we've already instantiated a vector of this type. 1227 llvm::FoldingSetNodeID ID; 1228 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1229 void *InsertPos = 0; 1230 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1231 return QualType(VTP, 0); 1232 1233 // If the element type isn't canonical, this won't be a canonical type either, 1234 // so fill in the canonical type field. 1235 QualType Canonical; 1236 if (!vecType->isCanonical()) { 1237 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1238 1239 // Get the new insert position for the node we care about. 1240 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1241 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1242 } 1243 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1244 VectorTypes.InsertNode(New, InsertPos); 1245 Types.push_back(New); 1246 return QualType(New, 0); 1247} 1248 1249/// getExtVectorType - Return the unique reference to an extended vector type of 1250/// the specified element type and size. VectorType must be a built-in type. 1251QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1252 BuiltinType *baseType; 1253 1254 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1255 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1256 1257 // Check if we've already instantiated a vector of this type. 1258 llvm::FoldingSetNodeID ID; 1259 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1260 void *InsertPos = 0; 1261 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1262 return QualType(VTP, 0); 1263 1264 // If the element type isn't canonical, this won't be a canonical type either, 1265 // so fill in the canonical type field. 1266 QualType Canonical; 1267 if (!vecType->isCanonical()) { 1268 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1269 1270 // Get the new insert position for the node we care about. 1271 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1272 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1273 } 1274 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1275 VectorTypes.InsertNode(New, InsertPos); 1276 Types.push_back(New); 1277 return QualType(New, 0); 1278} 1279 1280QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1281 Expr *SizeExpr, 1282 SourceLocation AttrLoc) { 1283 DependentSizedExtVectorType *New = 1284 new (*this,8) DependentSizedExtVectorType(vecType, QualType(), 1285 SizeExpr, AttrLoc); 1286 1287 DependentSizedExtVectorTypes.push_back(New); 1288 Types.push_back(New); 1289 return QualType(New, 0); 1290} 1291 1292/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1293/// 1294QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) { 1295 // Unique functions, to guarantee there is only one function of a particular 1296 // structure. 1297 llvm::FoldingSetNodeID ID; 1298 FunctionNoProtoType::Profile(ID, ResultTy); 1299 1300 void *InsertPos = 0; 1301 if (FunctionNoProtoType *FT = 1302 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1303 return QualType(FT, 0); 1304 1305 QualType Canonical; 1306 if (!ResultTy->isCanonical()) { 1307 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy)); 1308 1309 // Get the new insert position for the node we care about. 1310 FunctionNoProtoType *NewIP = 1311 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1312 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1313 } 1314 1315 FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical); 1316 Types.push_back(New); 1317 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1318 return QualType(New, 0); 1319} 1320 1321/// getFunctionType - Return a normal function type with a typed argument 1322/// list. isVariadic indicates whether the argument list includes '...'. 1323QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1324 unsigned NumArgs, bool isVariadic, 1325 unsigned TypeQuals, bool hasExceptionSpec, 1326 bool hasAnyExceptionSpec, unsigned NumExs, 1327 const QualType *ExArray) { 1328 // Unique functions, to guarantee there is only one function of a particular 1329 // structure. 1330 llvm::FoldingSetNodeID ID; 1331 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1332 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1333 NumExs, ExArray); 1334 1335 void *InsertPos = 0; 1336 if (FunctionProtoType *FTP = 1337 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1338 return QualType(FTP, 0); 1339 1340 // Determine whether the type being created is already canonical or not. 1341 bool isCanonical = ResultTy->isCanonical(); 1342 if (hasExceptionSpec) 1343 isCanonical = false; 1344 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1345 if (!ArgArray[i]->isCanonical()) 1346 isCanonical = false; 1347 1348 // If this type isn't canonical, get the canonical version of it. 1349 // The exception spec is not part of the canonical type. 1350 QualType Canonical; 1351 if (!isCanonical) { 1352 llvm::SmallVector<QualType, 16> CanonicalArgs; 1353 CanonicalArgs.reserve(NumArgs); 1354 for (unsigned i = 0; i != NumArgs; ++i) 1355 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1356 1357 Canonical = getFunctionType(getCanonicalType(ResultTy), 1358 CanonicalArgs.data(), NumArgs, 1359 isVariadic, TypeQuals); 1360 1361 // Get the new insert position for the node we care about. 1362 FunctionProtoType *NewIP = 1363 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1364 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1365 } 1366 1367 // FunctionProtoType objects are allocated with extra bytes after them 1368 // for two variable size arrays (for parameter and exception types) at the 1369 // end of them. 1370 FunctionProtoType *FTP = 1371 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1372 NumArgs*sizeof(QualType) + 1373 NumExs*sizeof(QualType), 8); 1374 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1375 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1376 ExArray, NumExs, Canonical); 1377 Types.push_back(FTP); 1378 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1379 return QualType(FTP, 0); 1380} 1381 1382/// getTypeDeclType - Return the unique reference to the type for the 1383/// specified type declaration. 1384QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1385 assert(Decl && "Passed null for Decl param"); 1386 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1387 1388 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1389 return getTypedefType(Typedef); 1390 else if (isa<TemplateTypeParmDecl>(Decl)) { 1391 assert(false && "Template type parameter types are always available."); 1392 } else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1393 return getObjCInterfaceType(ObjCInterface); 1394 1395 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1396 if (PrevDecl) 1397 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1398 else 1399 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1400 } 1401 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1402 if (PrevDecl) 1403 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1404 else 1405 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1406 } 1407 else 1408 assert(false && "TypeDecl without a type?"); 1409 1410 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1411 return QualType(Decl->TypeForDecl, 0); 1412} 1413 1414/// getTypedefType - Return the unique reference to the type for the 1415/// specified typename decl. 1416QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1417 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1418 1419 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1420 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1421 Types.push_back(Decl->TypeForDecl); 1422 return QualType(Decl->TypeForDecl, 0); 1423} 1424 1425/// getObjCInterfaceType - Return the unique reference to the type for the 1426/// specified ObjC interface decl. 1427QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) { 1428 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1429 1430 ObjCInterfaceDecl *OID = const_cast<ObjCInterfaceDecl*>(Decl); 1431 Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, OID); 1432 Types.push_back(Decl->TypeForDecl); 1433 return QualType(Decl->TypeForDecl, 0); 1434} 1435 1436/// \brief Retrieve the template type parameter type for a template 1437/// parameter or parameter pack with the given depth, index, and (optionally) 1438/// name. 1439QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1440 bool ParameterPack, 1441 IdentifierInfo *Name) { 1442 llvm::FoldingSetNodeID ID; 1443 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1444 void *InsertPos = 0; 1445 TemplateTypeParmType *TypeParm 1446 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1447 1448 if (TypeParm) 1449 return QualType(TypeParm, 0); 1450 1451 if (Name) { 1452 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1453 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack, 1454 Name, Canon); 1455 } else 1456 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack); 1457 1458 Types.push_back(TypeParm); 1459 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1460 1461 return QualType(TypeParm, 0); 1462} 1463 1464QualType 1465ASTContext::getTemplateSpecializationType(TemplateName Template, 1466 const TemplateArgument *Args, 1467 unsigned NumArgs, 1468 QualType Canon) { 1469 if (!Canon.isNull()) 1470 Canon = getCanonicalType(Canon); 1471 1472 llvm::FoldingSetNodeID ID; 1473 TemplateSpecializationType::Profile(ID, Template, Args, NumArgs); 1474 1475 void *InsertPos = 0; 1476 TemplateSpecializationType *Spec 1477 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1478 1479 if (Spec) 1480 return QualType(Spec, 0); 1481 1482 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1483 sizeof(TemplateArgument) * NumArgs), 1484 8); 1485 Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon); 1486 Types.push_back(Spec); 1487 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1488 1489 return QualType(Spec, 0); 1490} 1491 1492QualType 1493ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1494 QualType NamedType) { 1495 llvm::FoldingSetNodeID ID; 1496 QualifiedNameType::Profile(ID, NNS, NamedType); 1497 1498 void *InsertPos = 0; 1499 QualifiedNameType *T 1500 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1501 if (T) 1502 return QualType(T, 0); 1503 1504 T = new (*this) QualifiedNameType(NNS, NamedType, 1505 getCanonicalType(NamedType)); 1506 Types.push_back(T); 1507 QualifiedNameTypes.InsertNode(T, InsertPos); 1508 return QualType(T, 0); 1509} 1510 1511QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1512 const IdentifierInfo *Name, 1513 QualType Canon) { 1514 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1515 1516 if (Canon.isNull()) { 1517 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1518 if (CanonNNS != NNS) 1519 Canon = getTypenameType(CanonNNS, Name); 1520 } 1521 1522 llvm::FoldingSetNodeID ID; 1523 TypenameType::Profile(ID, NNS, Name); 1524 1525 void *InsertPos = 0; 1526 TypenameType *T 1527 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1528 if (T) 1529 return QualType(T, 0); 1530 1531 T = new (*this) TypenameType(NNS, Name, Canon); 1532 Types.push_back(T); 1533 TypenameTypes.InsertNode(T, InsertPos); 1534 return QualType(T, 0); 1535} 1536 1537QualType 1538ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1539 const TemplateSpecializationType *TemplateId, 1540 QualType Canon) { 1541 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1542 1543 if (Canon.isNull()) { 1544 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1545 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1546 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1547 const TemplateSpecializationType *CanonTemplateId 1548 = CanonType->getAsTemplateSpecializationType(); 1549 assert(CanonTemplateId && 1550 "Canonical type must also be a template specialization type"); 1551 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1552 } 1553 } 1554 1555 llvm::FoldingSetNodeID ID; 1556 TypenameType::Profile(ID, NNS, TemplateId); 1557 1558 void *InsertPos = 0; 1559 TypenameType *T 1560 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1561 if (T) 1562 return QualType(T, 0); 1563 1564 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1565 Types.push_back(T); 1566 TypenameTypes.InsertNode(T, InsertPos); 1567 return QualType(T, 0); 1568} 1569 1570/// CmpProtocolNames - Comparison predicate for sorting protocols 1571/// alphabetically. 1572static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1573 const ObjCProtocolDecl *RHS) { 1574 return LHS->getDeclName() < RHS->getDeclName(); 1575} 1576 1577static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1578 unsigned &NumProtocols) { 1579 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1580 1581 // Sort protocols, keyed by name. 1582 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1583 1584 // Remove duplicates. 1585 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1586 NumProtocols = ProtocolsEnd-Protocols; 1587} 1588 1589/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1590/// the given interface decl and the conforming protocol list. 1591QualType ASTContext::getObjCObjectPointerType(ObjCInterfaceDecl *Decl, 1592 ObjCProtocolDecl **Protocols, 1593 unsigned NumProtocols) { 1594 // Sort the protocol list alphabetically to canonicalize it. 1595 if (NumProtocols) 1596 SortAndUniqueProtocols(Protocols, NumProtocols); 1597 1598 llvm::FoldingSetNodeID ID; 1599 ObjCObjectPointerType::Profile(ID, Decl, Protocols, NumProtocols); 1600 1601 void *InsertPos = 0; 1602 if (ObjCObjectPointerType *QT = 1603 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1604 return QualType(QT, 0); 1605 1606 // No Match; 1607 ObjCObjectPointerType *QType = 1608 new (*this,8) ObjCObjectPointerType(Decl, Protocols, NumProtocols); 1609 1610 Types.push_back(QType); 1611 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1612 return QualType(QType, 0); 1613} 1614 1615/// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for 1616/// the given interface decl and the conforming protocol list. 1617QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 1618 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1619 // Sort the protocol list alphabetically to canonicalize it. 1620 SortAndUniqueProtocols(Protocols, NumProtocols); 1621 1622 llvm::FoldingSetNodeID ID; 1623 ObjCQualifiedInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1624 1625 void *InsertPos = 0; 1626 if (ObjCQualifiedInterfaceType *QT = 1627 ObjCQualifiedInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1628 return QualType(QT, 0); 1629 1630 // No Match; 1631 ObjCQualifiedInterfaceType *QType = 1632 new (*this,8) ObjCQualifiedInterfaceType(Decl, Protocols, NumProtocols); 1633 1634 Types.push_back(QType); 1635 ObjCQualifiedInterfaceTypes.InsertNode(QType, InsertPos); 1636 return QualType(QType, 0); 1637} 1638 1639/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1640/// TypeOfExprType AST's (since expression's are never shared). For example, 1641/// multiple declarations that refer to "typeof(x)" all contain different 1642/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1643/// on canonical type's (which are always unique). 1644QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1645 QualType Canonical = getCanonicalType(tofExpr->getType()); 1646 TypeOfExprType *toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1647 Types.push_back(toe); 1648 return QualType(toe, 0); 1649} 1650 1651/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1652/// TypeOfType AST's. The only motivation to unique these nodes would be 1653/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1654/// an issue. This doesn't effect the type checker, since it operates 1655/// on canonical type's (which are always unique). 1656QualType ASTContext::getTypeOfType(QualType tofType) { 1657 QualType Canonical = getCanonicalType(tofType); 1658 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1659 Types.push_back(tot); 1660 return QualType(tot, 0); 1661} 1662 1663/// getDecltypeForExpr - Given an expr, will return the decltype for that 1664/// expression, according to the rules in C++0x [dcl.type.simple]p4 1665static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 1666 if (e->isTypeDependent()) 1667 return Context.DependentTy; 1668 1669 // If e is an id expression or a class member access, decltype(e) is defined 1670 // as the type of the entity named by e. 1671 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 1672 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 1673 return VD->getType(); 1674 } 1675 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 1676 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1677 return FD->getType(); 1678 } 1679 // If e is a function call or an invocation of an overloaded operator, 1680 // (parentheses around e are ignored), decltype(e) is defined as the 1681 // return type of that function. 1682 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 1683 return CE->getCallReturnType(); 1684 1685 QualType T = e->getType(); 1686 1687 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 1688 // defined as T&, otherwise decltype(e) is defined as T. 1689 if (e->isLvalue(Context) == Expr::LV_Valid) 1690 T = Context.getLValueReferenceType(T); 1691 1692 return T; 1693} 1694 1695/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 1696/// DecltypeType AST's. The only motivation to unique these nodes would be 1697/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 1698/// an issue. This doesn't effect the type checker, since it operates 1699/// on canonical type's (which are always unique). 1700QualType ASTContext::getDecltypeType(Expr *e) { 1701 QualType T = getDecltypeForExpr(e, *this); 1702 DecltypeType *dt = new (*this, 8) DecltypeType(e, getCanonicalType(T)); 1703 Types.push_back(dt); 1704 return QualType(dt, 0); 1705} 1706 1707/// getTagDeclType - Return the unique reference to the type for the 1708/// specified TagDecl (struct/union/class/enum) decl. 1709QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1710 assert (Decl); 1711 return getTypeDeclType(Decl); 1712} 1713 1714/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1715/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1716/// needs to agree with the definition in <stddef.h>. 1717QualType ASTContext::getSizeType() const { 1718 return getFromTargetType(Target.getSizeType()); 1719} 1720 1721/// getSignedWCharType - Return the type of "signed wchar_t". 1722/// Used when in C++, as a GCC extension. 1723QualType ASTContext::getSignedWCharType() const { 1724 // FIXME: derive from "Target" ? 1725 return WCharTy; 1726} 1727 1728/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1729/// Used when in C++, as a GCC extension. 1730QualType ASTContext::getUnsignedWCharType() const { 1731 // FIXME: derive from "Target" ? 1732 return UnsignedIntTy; 1733} 1734 1735/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 1736/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 1737QualType ASTContext::getPointerDiffType() const { 1738 return getFromTargetType(Target.getPtrDiffType(0)); 1739} 1740 1741//===----------------------------------------------------------------------===// 1742// Type Operators 1743//===----------------------------------------------------------------------===// 1744 1745/// getCanonicalType - Return the canonical (structural) type corresponding to 1746/// the specified potentially non-canonical type. The non-canonical version 1747/// of a type may have many "decorated" versions of types. Decorators can 1748/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 1749/// to be free of any of these, allowing two canonical types to be compared 1750/// for exact equality with a simple pointer comparison. 1751QualType ASTContext::getCanonicalType(QualType T) { 1752 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 1753 1754 // If the result has type qualifiers, make sure to canonicalize them as well. 1755 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 1756 if (TypeQuals == 0) return CanType; 1757 1758 // If the type qualifiers are on an array type, get the canonical type of the 1759 // array with the qualifiers applied to the element type. 1760 ArrayType *AT = dyn_cast<ArrayType>(CanType); 1761 if (!AT) 1762 return CanType.getQualifiedType(TypeQuals); 1763 1764 // Get the canonical version of the element with the extra qualifiers on it. 1765 // This can recursively sink qualifiers through multiple levels of arrays. 1766 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 1767 NewEltTy = getCanonicalType(NewEltTy); 1768 1769 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1770 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 1771 CAT->getIndexTypeQualifier()); 1772 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 1773 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 1774 IAT->getIndexTypeQualifier()); 1775 1776 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 1777 return getDependentSizedArrayType(NewEltTy, DSAT->getSizeExpr(), 1778 DSAT->getSizeModifier(), 1779 DSAT->getIndexTypeQualifier()); 1780 1781 VariableArrayType *VAT = cast<VariableArrayType>(AT); 1782 return getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1783 VAT->getSizeModifier(), 1784 VAT->getIndexTypeQualifier()); 1785} 1786 1787Decl *ASTContext::getCanonicalDecl(Decl *D) { 1788 if (!D) 1789 return 0; 1790 1791 if (TagDecl *Tag = dyn_cast<TagDecl>(D)) { 1792 QualType T = getTagDeclType(Tag); 1793 return cast<TagDecl>(cast<TagType>(T.getTypePtr()->CanonicalType) 1794 ->getDecl()); 1795 } 1796 1797 if (ClassTemplateDecl *Template = dyn_cast<ClassTemplateDecl>(D)) { 1798 while (Template->getPreviousDeclaration()) 1799 Template = Template->getPreviousDeclaration(); 1800 return Template; 1801 } 1802 1803 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 1804 while (Function->getPreviousDeclaration()) 1805 Function = Function->getPreviousDeclaration(); 1806 return const_cast<FunctionDecl *>(Function); 1807 } 1808 1809 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) { 1810 while (FunTmpl->getPreviousDeclaration()) 1811 FunTmpl = FunTmpl->getPreviousDeclaration(); 1812 return FunTmpl; 1813 } 1814 1815 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 1816 while (Var->getPreviousDeclaration()) 1817 Var = Var->getPreviousDeclaration(); 1818 return const_cast<VarDecl *>(Var); 1819 } 1820 1821 return D; 1822} 1823 1824TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 1825 // If this template name refers to a template, the canonical 1826 // template name merely stores the template itself. 1827 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 1828 return TemplateName(cast<TemplateDecl>(getCanonicalDecl(Template))); 1829 1830 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 1831 assert(DTN && "Non-dependent template names must refer to template decls."); 1832 return DTN->CanonicalTemplateName; 1833} 1834 1835NestedNameSpecifier * 1836ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 1837 if (!NNS) 1838 return 0; 1839 1840 switch (NNS->getKind()) { 1841 case NestedNameSpecifier::Identifier: 1842 // Canonicalize the prefix but keep the identifier the same. 1843 return NestedNameSpecifier::Create(*this, 1844 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 1845 NNS->getAsIdentifier()); 1846 1847 case NestedNameSpecifier::Namespace: 1848 // A namespace is canonical; build a nested-name-specifier with 1849 // this namespace and no prefix. 1850 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 1851 1852 case NestedNameSpecifier::TypeSpec: 1853 case NestedNameSpecifier::TypeSpecWithTemplate: { 1854 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 1855 NestedNameSpecifier *Prefix = 0; 1856 1857 // FIXME: This isn't the right check! 1858 if (T->isDependentType()) 1859 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 1860 1861 return NestedNameSpecifier::Create(*this, Prefix, 1862 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 1863 T.getTypePtr()); 1864 } 1865 1866 case NestedNameSpecifier::Global: 1867 // The global specifier is canonical and unique. 1868 return NNS; 1869 } 1870 1871 // Required to silence a GCC warning 1872 return 0; 1873} 1874 1875 1876const ArrayType *ASTContext::getAsArrayType(QualType T) { 1877 // Handle the non-qualified case efficiently. 1878 if (T.getCVRQualifiers() == 0) { 1879 // Handle the common positive case fast. 1880 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 1881 return AT; 1882 } 1883 1884 // Handle the common negative case fast, ignoring CVR qualifiers. 1885 QualType CType = T->getCanonicalTypeInternal(); 1886 1887 // Make sure to look through type qualifiers (like ExtQuals) for the negative 1888 // test. 1889 if (!isa<ArrayType>(CType) && 1890 !isa<ArrayType>(CType.getUnqualifiedType())) 1891 return 0; 1892 1893 // Apply any CVR qualifiers from the array type to the element type. This 1894 // implements C99 6.7.3p8: "If the specification of an array type includes 1895 // any type qualifiers, the element type is so qualified, not the array type." 1896 1897 // If we get here, we either have type qualifiers on the type, or we have 1898 // sugar such as a typedef in the way. If we have type qualifiers on the type 1899 // we must propagate them down into the elemeng type. 1900 unsigned CVRQuals = T.getCVRQualifiers(); 1901 unsigned AddrSpace = 0; 1902 Type *Ty = T.getTypePtr(); 1903 1904 // Rip through ExtQualType's and typedefs to get to a concrete type. 1905 while (1) { 1906 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 1907 AddrSpace = EXTQT->getAddressSpace(); 1908 Ty = EXTQT->getBaseType(); 1909 } else { 1910 T = Ty->getDesugaredType(); 1911 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 1912 break; 1913 CVRQuals |= T.getCVRQualifiers(); 1914 Ty = T.getTypePtr(); 1915 } 1916 } 1917 1918 // If we have a simple case, just return now. 1919 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 1920 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 1921 return ATy; 1922 1923 // Otherwise, we have an array and we have qualifiers on it. Push the 1924 // qualifiers into the array element type and return a new array type. 1925 // Get the canonical version of the element with the extra qualifiers on it. 1926 // This can recursively sink qualifiers through multiple levels of arrays. 1927 QualType NewEltTy = ATy->getElementType(); 1928 if (AddrSpace) 1929 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 1930 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 1931 1932 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 1933 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 1934 CAT->getSizeModifier(), 1935 CAT->getIndexTypeQualifier())); 1936 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 1937 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 1938 IAT->getSizeModifier(), 1939 IAT->getIndexTypeQualifier())); 1940 1941 if (const DependentSizedArrayType *DSAT 1942 = dyn_cast<DependentSizedArrayType>(ATy)) 1943 return cast<ArrayType>( 1944 getDependentSizedArrayType(NewEltTy, 1945 DSAT->getSizeExpr(), 1946 DSAT->getSizeModifier(), 1947 DSAT->getIndexTypeQualifier())); 1948 1949 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 1950 return cast<ArrayType>(getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1951 VAT->getSizeModifier(), 1952 VAT->getIndexTypeQualifier())); 1953} 1954 1955 1956/// getArrayDecayedType - Return the properly qualified result of decaying the 1957/// specified array type to a pointer. This operation is non-trivial when 1958/// handling typedefs etc. The canonical type of "T" must be an array type, 1959/// this returns a pointer to a properly qualified element of the array. 1960/// 1961/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 1962QualType ASTContext::getArrayDecayedType(QualType Ty) { 1963 // Get the element type with 'getAsArrayType' so that we don't lose any 1964 // typedefs in the element type of the array. This also handles propagation 1965 // of type qualifiers from the array type into the element type if present 1966 // (C99 6.7.3p8). 1967 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 1968 assert(PrettyArrayType && "Not an array type!"); 1969 1970 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 1971 1972 // int x[restrict 4] -> int *restrict 1973 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 1974} 1975 1976QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 1977 QualType ElemTy = VAT->getElementType(); 1978 1979 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 1980 return getBaseElementType(VAT); 1981 1982 return ElemTy; 1983} 1984 1985/// getFloatingRank - Return a relative rank for floating point types. 1986/// This routine will assert if passed a built-in type that isn't a float. 1987static FloatingRank getFloatingRank(QualType T) { 1988 if (const ComplexType *CT = T->getAsComplexType()) 1989 return getFloatingRank(CT->getElementType()); 1990 1991 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 1992 switch (T->getAsBuiltinType()->getKind()) { 1993 default: assert(0 && "getFloatingRank(): not a floating type"); 1994 case BuiltinType::Float: return FloatRank; 1995 case BuiltinType::Double: return DoubleRank; 1996 case BuiltinType::LongDouble: return LongDoubleRank; 1997 } 1998} 1999 2000/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2001/// point or a complex type (based on typeDomain/typeSize). 2002/// 'typeDomain' is a real floating point or complex type. 2003/// 'typeSize' is a real floating point or complex type. 2004QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2005 QualType Domain) const { 2006 FloatingRank EltRank = getFloatingRank(Size); 2007 if (Domain->isComplexType()) { 2008 switch (EltRank) { 2009 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2010 case FloatRank: return FloatComplexTy; 2011 case DoubleRank: return DoubleComplexTy; 2012 case LongDoubleRank: return LongDoubleComplexTy; 2013 } 2014 } 2015 2016 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2017 switch (EltRank) { 2018 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2019 case FloatRank: return FloatTy; 2020 case DoubleRank: return DoubleTy; 2021 case LongDoubleRank: return LongDoubleTy; 2022 } 2023} 2024 2025/// getFloatingTypeOrder - Compare the rank of the two specified floating 2026/// point types, ignoring the domain of the type (i.e. 'double' == 2027/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2028/// LHS < RHS, return -1. 2029int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2030 FloatingRank LHSR = getFloatingRank(LHS); 2031 FloatingRank RHSR = getFloatingRank(RHS); 2032 2033 if (LHSR == RHSR) 2034 return 0; 2035 if (LHSR > RHSR) 2036 return 1; 2037 return -1; 2038} 2039 2040/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2041/// routine will assert if passed a built-in type that isn't an integer or enum, 2042/// or if it is not canonicalized. 2043unsigned ASTContext::getIntegerRank(Type *T) { 2044 assert(T->isCanonical() && "T should be canonicalized"); 2045 if (EnumType* ET = dyn_cast<EnumType>(T)) 2046 T = ET->getDecl()->getIntegerType().getTypePtr(); 2047 2048 // There are two things which impact the integer rank: the width, and 2049 // the ordering of builtins. The builtin ordering is encoded in the 2050 // bottom three bits; the width is encoded in the bits above that. 2051 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2052 return FWIT->getWidth() << 3; 2053 2054 switch (cast<BuiltinType>(T)->getKind()) { 2055 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2056 case BuiltinType::Bool: 2057 return 1 + (getIntWidth(BoolTy) << 3); 2058 case BuiltinType::Char_S: 2059 case BuiltinType::Char_U: 2060 case BuiltinType::SChar: 2061 case BuiltinType::UChar: 2062 return 2 + (getIntWidth(CharTy) << 3); 2063 case BuiltinType::Short: 2064 case BuiltinType::UShort: 2065 return 3 + (getIntWidth(ShortTy) << 3); 2066 case BuiltinType::Int: 2067 case BuiltinType::UInt: 2068 return 4 + (getIntWidth(IntTy) << 3); 2069 case BuiltinType::Long: 2070 case BuiltinType::ULong: 2071 return 5 + (getIntWidth(LongTy) << 3); 2072 case BuiltinType::LongLong: 2073 case BuiltinType::ULongLong: 2074 return 6 + (getIntWidth(LongLongTy) << 3); 2075 case BuiltinType::Int128: 2076 case BuiltinType::UInt128: 2077 return 7 + (getIntWidth(Int128Ty) << 3); 2078 } 2079} 2080 2081/// getIntegerTypeOrder - Returns the highest ranked integer type: 2082/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2083/// LHS < RHS, return -1. 2084int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2085 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2086 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2087 if (LHSC == RHSC) return 0; 2088 2089 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2090 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2091 2092 unsigned LHSRank = getIntegerRank(LHSC); 2093 unsigned RHSRank = getIntegerRank(RHSC); 2094 2095 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2096 if (LHSRank == RHSRank) return 0; 2097 return LHSRank > RHSRank ? 1 : -1; 2098 } 2099 2100 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2101 if (LHSUnsigned) { 2102 // If the unsigned [LHS] type is larger, return it. 2103 if (LHSRank >= RHSRank) 2104 return 1; 2105 2106 // If the signed type can represent all values of the unsigned type, it 2107 // wins. Because we are dealing with 2's complement and types that are 2108 // powers of two larger than each other, this is always safe. 2109 return -1; 2110 } 2111 2112 // If the unsigned [RHS] type is larger, return it. 2113 if (RHSRank >= LHSRank) 2114 return -1; 2115 2116 // If the signed type can represent all values of the unsigned type, it 2117 // wins. Because we are dealing with 2's complement and types that are 2118 // powers of two larger than each other, this is always safe. 2119 return 1; 2120} 2121 2122// getCFConstantStringType - Return the type used for constant CFStrings. 2123QualType ASTContext::getCFConstantStringType() { 2124 if (!CFConstantStringTypeDecl) { 2125 CFConstantStringTypeDecl = 2126 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2127 &Idents.get("NSConstantString")); 2128 QualType FieldTypes[4]; 2129 2130 // const int *isa; 2131 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2132 // int flags; 2133 FieldTypes[1] = IntTy; 2134 // const char *str; 2135 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2136 // long length; 2137 FieldTypes[3] = LongTy; 2138 2139 // Create fields 2140 for (unsigned i = 0; i < 4; ++i) { 2141 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2142 SourceLocation(), 0, 2143 FieldTypes[i], /*BitWidth=*/0, 2144 /*Mutable=*/false); 2145 CFConstantStringTypeDecl->addDecl(*this, Field); 2146 } 2147 2148 CFConstantStringTypeDecl->completeDefinition(*this); 2149 } 2150 2151 return getTagDeclType(CFConstantStringTypeDecl); 2152} 2153 2154void ASTContext::setCFConstantStringType(QualType T) { 2155 const RecordType *Rec = T->getAsRecordType(); 2156 assert(Rec && "Invalid CFConstantStringType"); 2157 CFConstantStringTypeDecl = Rec->getDecl(); 2158} 2159 2160QualType ASTContext::getObjCFastEnumerationStateType() 2161{ 2162 if (!ObjCFastEnumerationStateTypeDecl) { 2163 ObjCFastEnumerationStateTypeDecl = 2164 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2165 &Idents.get("__objcFastEnumerationState")); 2166 2167 QualType FieldTypes[] = { 2168 UnsignedLongTy, 2169 getPointerType(ObjCIdType), 2170 getPointerType(UnsignedLongTy), 2171 getConstantArrayType(UnsignedLongTy, 2172 llvm::APInt(32, 5), ArrayType::Normal, 0) 2173 }; 2174 2175 for (size_t i = 0; i < 4; ++i) { 2176 FieldDecl *Field = FieldDecl::Create(*this, 2177 ObjCFastEnumerationStateTypeDecl, 2178 SourceLocation(), 0, 2179 FieldTypes[i], /*BitWidth=*/0, 2180 /*Mutable=*/false); 2181 ObjCFastEnumerationStateTypeDecl->addDecl(*this, Field); 2182 } 2183 2184 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2185 } 2186 2187 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2188} 2189 2190void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2191 const RecordType *Rec = T->getAsRecordType(); 2192 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2193 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2194} 2195 2196// This returns true if a type has been typedefed to BOOL: 2197// typedef <type> BOOL; 2198static bool isTypeTypedefedAsBOOL(QualType T) { 2199 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2200 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2201 return II->isStr("BOOL"); 2202 2203 return false; 2204} 2205 2206/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2207/// purpose. 2208int ASTContext::getObjCEncodingTypeSize(QualType type) { 2209 uint64_t sz = getTypeSize(type); 2210 2211 // Make all integer and enum types at least as large as an int 2212 if (sz > 0 && type->isIntegralType()) 2213 sz = std::max(sz, getTypeSize(IntTy)); 2214 // Treat arrays as pointers, since that's how they're passed in. 2215 else if (type->isArrayType()) 2216 sz = getTypeSize(VoidPtrTy); 2217 return sz / getTypeSize(CharTy); 2218} 2219 2220/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2221/// declaration. 2222void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2223 std::string& S) { 2224 // FIXME: This is not very efficient. 2225 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2226 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2227 // Encode result type. 2228 getObjCEncodingForType(Decl->getResultType(), S); 2229 // Compute size of all parameters. 2230 // Start with computing size of a pointer in number of bytes. 2231 // FIXME: There might(should) be a better way of doing this computation! 2232 SourceLocation Loc; 2233 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2234 // The first two arguments (self and _cmd) are pointers; account for 2235 // their size. 2236 int ParmOffset = 2 * PtrSize; 2237 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2238 E = Decl->param_end(); PI != E; ++PI) { 2239 QualType PType = (*PI)->getType(); 2240 int sz = getObjCEncodingTypeSize(PType); 2241 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2242 ParmOffset += sz; 2243 } 2244 S += llvm::utostr(ParmOffset); 2245 S += "@0:"; 2246 S += llvm::utostr(PtrSize); 2247 2248 // Argument types. 2249 ParmOffset = 2 * PtrSize; 2250 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2251 E = Decl->param_end(); PI != E; ++PI) { 2252 ParmVarDecl *PVDecl = *PI; 2253 QualType PType = PVDecl->getOriginalType(); 2254 if (const ArrayType *AT = 2255 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2256 // Use array's original type only if it has known number of 2257 // elements. 2258 if (!isa<ConstantArrayType>(AT)) 2259 PType = PVDecl->getType(); 2260 } else if (PType->isFunctionType()) 2261 PType = PVDecl->getType(); 2262 // Process argument qualifiers for user supplied arguments; such as, 2263 // 'in', 'inout', etc. 2264 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2265 getObjCEncodingForType(PType, S); 2266 S += llvm::utostr(ParmOffset); 2267 ParmOffset += getObjCEncodingTypeSize(PType); 2268 } 2269} 2270 2271/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2272/// property declaration. If non-NULL, Container must be either an 2273/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2274/// NULL when getting encodings for protocol properties. 2275/// Property attributes are stored as a comma-delimited C string. The simple 2276/// attributes readonly and bycopy are encoded as single characters. The 2277/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2278/// encoded as single characters, followed by an identifier. Property types 2279/// are also encoded as a parametrized attribute. The characters used to encode 2280/// these attributes are defined by the following enumeration: 2281/// @code 2282/// enum PropertyAttributes { 2283/// kPropertyReadOnly = 'R', // property is read-only. 2284/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2285/// kPropertyByref = '&', // property is a reference to the value last assigned 2286/// kPropertyDynamic = 'D', // property is dynamic 2287/// kPropertyGetter = 'G', // followed by getter selector name 2288/// kPropertySetter = 'S', // followed by setter selector name 2289/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2290/// kPropertyType = 't' // followed by old-style type encoding. 2291/// kPropertyWeak = 'W' // 'weak' property 2292/// kPropertyStrong = 'P' // property GC'able 2293/// kPropertyNonAtomic = 'N' // property non-atomic 2294/// }; 2295/// @endcode 2296void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2297 const Decl *Container, 2298 std::string& S) { 2299 // Collect information from the property implementation decl(s). 2300 bool Dynamic = false; 2301 ObjCPropertyImplDecl *SynthesizePID = 0; 2302 2303 // FIXME: Duplicated code due to poor abstraction. 2304 if (Container) { 2305 if (const ObjCCategoryImplDecl *CID = 2306 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2307 for (ObjCCategoryImplDecl::propimpl_iterator 2308 i = CID->propimpl_begin(*this), e = CID->propimpl_end(*this); 2309 i != e; ++i) { 2310 ObjCPropertyImplDecl *PID = *i; 2311 if (PID->getPropertyDecl() == PD) { 2312 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2313 Dynamic = true; 2314 } else { 2315 SynthesizePID = PID; 2316 } 2317 } 2318 } 2319 } else { 2320 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2321 for (ObjCCategoryImplDecl::propimpl_iterator 2322 i = OID->propimpl_begin(*this), e = OID->propimpl_end(*this); 2323 i != e; ++i) { 2324 ObjCPropertyImplDecl *PID = *i; 2325 if (PID->getPropertyDecl() == PD) { 2326 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2327 Dynamic = true; 2328 } else { 2329 SynthesizePID = PID; 2330 } 2331 } 2332 } 2333 } 2334 } 2335 2336 // FIXME: This is not very efficient. 2337 S = "T"; 2338 2339 // Encode result type. 2340 // GCC has some special rules regarding encoding of properties which 2341 // closely resembles encoding of ivars. 2342 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2343 true /* outermost type */, 2344 true /* encoding for property */); 2345 2346 if (PD->isReadOnly()) { 2347 S += ",R"; 2348 } else { 2349 switch (PD->getSetterKind()) { 2350 case ObjCPropertyDecl::Assign: break; 2351 case ObjCPropertyDecl::Copy: S += ",C"; break; 2352 case ObjCPropertyDecl::Retain: S += ",&"; break; 2353 } 2354 } 2355 2356 // It really isn't clear at all what this means, since properties 2357 // are "dynamic by default". 2358 if (Dynamic) 2359 S += ",D"; 2360 2361 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2362 S += ",N"; 2363 2364 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2365 S += ",G"; 2366 S += PD->getGetterName().getAsString(); 2367 } 2368 2369 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2370 S += ",S"; 2371 S += PD->getSetterName().getAsString(); 2372 } 2373 2374 if (SynthesizePID) { 2375 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2376 S += ",V"; 2377 S += OID->getNameAsString(); 2378 } 2379 2380 // FIXME: OBJCGC: weak & strong 2381} 2382 2383/// getLegacyIntegralTypeEncoding - 2384/// Another legacy compatibility encoding: 32-bit longs are encoded as 2385/// 'l' or 'L' , but not always. For typedefs, we need to use 2386/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2387/// 2388void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2389 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 2390 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2391 if (BT->getKind() == BuiltinType::ULong && 2392 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2393 PointeeTy = UnsignedIntTy; 2394 else 2395 if (BT->getKind() == BuiltinType::Long && 2396 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2397 PointeeTy = IntTy; 2398 } 2399 } 2400} 2401 2402void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2403 const FieldDecl *Field) { 2404 // We follow the behavior of gcc, expanding structures which are 2405 // directly pointed to, and expanding embedded structures. Note that 2406 // these rules are sufficient to prevent recursive encoding of the 2407 // same type. 2408 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2409 true /* outermost type */); 2410} 2411 2412static void EncodeBitField(const ASTContext *Context, std::string& S, 2413 const FieldDecl *FD) { 2414 const Expr *E = FD->getBitWidth(); 2415 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2416 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2417 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2418 S += 'b'; 2419 S += llvm::utostr(N); 2420} 2421 2422void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2423 bool ExpandPointedToStructures, 2424 bool ExpandStructures, 2425 const FieldDecl *FD, 2426 bool OutermostType, 2427 bool EncodingProperty) { 2428 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2429 if (FD && FD->isBitField()) { 2430 EncodeBitField(this, S, FD); 2431 } 2432 else { 2433 char encoding; 2434 switch (BT->getKind()) { 2435 default: assert(0 && "Unhandled builtin type kind"); 2436 case BuiltinType::Void: encoding = 'v'; break; 2437 case BuiltinType::Bool: encoding = 'B'; break; 2438 case BuiltinType::Char_U: 2439 case BuiltinType::UChar: encoding = 'C'; break; 2440 case BuiltinType::UShort: encoding = 'S'; break; 2441 case BuiltinType::UInt: encoding = 'I'; break; 2442 case BuiltinType::ULong: 2443 encoding = 2444 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2445 break; 2446 case BuiltinType::UInt128: encoding = 'T'; break; 2447 case BuiltinType::ULongLong: encoding = 'Q'; break; 2448 case BuiltinType::Char_S: 2449 case BuiltinType::SChar: encoding = 'c'; break; 2450 case BuiltinType::Short: encoding = 's'; break; 2451 case BuiltinType::Int: encoding = 'i'; break; 2452 case BuiltinType::Long: 2453 encoding = 2454 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2455 break; 2456 case BuiltinType::LongLong: encoding = 'q'; break; 2457 case BuiltinType::Int128: encoding = 't'; break; 2458 case BuiltinType::Float: encoding = 'f'; break; 2459 case BuiltinType::Double: encoding = 'd'; break; 2460 case BuiltinType::LongDouble: encoding = 'd'; break; 2461 } 2462 2463 S += encoding; 2464 } 2465 } else if (const ComplexType *CT = T->getAsComplexType()) { 2466 S += 'j'; 2467 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2468 false); 2469 } else if (T->isObjCQualifiedIdType()) { 2470 getObjCEncodingForTypeImpl(getObjCIdType(), S, 2471 ExpandPointedToStructures, 2472 ExpandStructures, FD); 2473 if (FD || EncodingProperty) { 2474 // Note that we do extended encoding of protocol qualifer list 2475 // Only when doing ivar or property encoding. 2476 const ObjCObjectPointerType *QIDT = T->getAsObjCQualifiedIdType(); 2477 S += '"'; 2478 for (ObjCObjectPointerType::qual_iterator I = QIDT->qual_begin(), 2479 E = QIDT->qual_end(); I != E; ++I) { 2480 S += '<'; 2481 S += (*I)->getNameAsString(); 2482 S += '>'; 2483 } 2484 S += '"'; 2485 } 2486 return; 2487 } 2488 else if (const PointerType *PT = T->getAsPointerType()) { 2489 QualType PointeeTy = PT->getPointeeType(); 2490 bool isReadOnly = false; 2491 // For historical/compatibility reasons, the read-only qualifier of the 2492 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2493 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2494 // Also, do not emit the 'r' for anything but the outermost type! 2495 if (dyn_cast<TypedefType>(T.getTypePtr())) { 2496 if (OutermostType && T.isConstQualified()) { 2497 isReadOnly = true; 2498 S += 'r'; 2499 } 2500 } 2501 else if (OutermostType) { 2502 QualType P = PointeeTy; 2503 while (P->getAsPointerType()) 2504 P = P->getAsPointerType()->getPointeeType(); 2505 if (P.isConstQualified()) { 2506 isReadOnly = true; 2507 S += 'r'; 2508 } 2509 } 2510 if (isReadOnly) { 2511 // Another legacy compatibility encoding. Some ObjC qualifier and type 2512 // combinations need to be rearranged. 2513 // Rewrite "in const" from "nr" to "rn" 2514 const char * s = S.c_str(); 2515 int len = S.length(); 2516 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2517 std::string replace = "rn"; 2518 S.replace(S.end()-2, S.end(), replace); 2519 } 2520 } 2521 if (isObjCIdStructType(PointeeTy)) { 2522 S += '@'; 2523 return; 2524 } 2525 else if (PointeeTy->isObjCInterfaceType()) { 2526 if (!EncodingProperty && 2527 isa<TypedefType>(PointeeTy.getTypePtr())) { 2528 // Another historical/compatibility reason. 2529 // We encode the underlying type which comes out as 2530 // {...}; 2531 S += '^'; 2532 getObjCEncodingForTypeImpl(PointeeTy, S, 2533 false, ExpandPointedToStructures, 2534 NULL); 2535 return; 2536 } 2537 S += '@'; 2538 if (FD || EncodingProperty) { 2539 const ObjCInterfaceType *OIT = 2540 PointeeTy.getUnqualifiedType()->getAsObjCInterfaceType(); 2541 ObjCInterfaceDecl *OI = OIT->getDecl(); 2542 S += '"'; 2543 S += OI->getNameAsCString(); 2544 for (ObjCInterfaceType::qual_iterator I = OIT->qual_begin(), 2545 E = OIT->qual_end(); I != E; ++I) { 2546 S += '<'; 2547 S += (*I)->getNameAsString(); 2548 S += '>'; 2549 } 2550 S += '"'; 2551 } 2552 return; 2553 } else if (isObjCClassStructType(PointeeTy)) { 2554 S += '#'; 2555 return; 2556 } else if (isObjCSelType(PointeeTy)) { 2557 S += ':'; 2558 return; 2559 } 2560 2561 if (PointeeTy->isCharType()) { 2562 // char pointer types should be encoded as '*' unless it is a 2563 // type that has been typedef'd to 'BOOL'. 2564 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2565 S += '*'; 2566 return; 2567 } 2568 } 2569 2570 S += '^'; 2571 getLegacyIntegralTypeEncoding(PointeeTy); 2572 2573 getObjCEncodingForTypeImpl(PointeeTy, S, 2574 false, ExpandPointedToStructures, 2575 NULL); 2576 } else if (const ArrayType *AT = 2577 // Ignore type qualifiers etc. 2578 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2579 if (isa<IncompleteArrayType>(AT)) { 2580 // Incomplete arrays are encoded as a pointer to the array element. 2581 S += '^'; 2582 2583 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2584 false, ExpandStructures, FD); 2585 } else { 2586 S += '['; 2587 2588 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2589 S += llvm::utostr(CAT->getSize().getZExtValue()); 2590 else { 2591 //Variable length arrays are encoded as a regular array with 0 elements. 2592 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2593 S += '0'; 2594 } 2595 2596 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2597 false, ExpandStructures, FD); 2598 S += ']'; 2599 } 2600 } else if (T->getAsFunctionType()) { 2601 S += '?'; 2602 } else if (const RecordType *RTy = T->getAsRecordType()) { 2603 RecordDecl *RDecl = RTy->getDecl(); 2604 S += RDecl->isUnion() ? '(' : '{'; 2605 // Anonymous structures print as '?' 2606 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2607 S += II->getName(); 2608 } else { 2609 S += '?'; 2610 } 2611 if (ExpandStructures) { 2612 S += '='; 2613 for (RecordDecl::field_iterator Field = RDecl->field_begin(*this), 2614 FieldEnd = RDecl->field_end(*this); 2615 Field != FieldEnd; ++Field) { 2616 if (FD) { 2617 S += '"'; 2618 S += Field->getNameAsString(); 2619 S += '"'; 2620 } 2621 2622 // Special case bit-fields. 2623 if (Field->isBitField()) { 2624 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2625 (*Field)); 2626 } else { 2627 QualType qt = Field->getType(); 2628 getLegacyIntegralTypeEncoding(qt); 2629 getObjCEncodingForTypeImpl(qt, S, false, true, 2630 FD); 2631 } 2632 } 2633 } 2634 S += RDecl->isUnion() ? ')' : '}'; 2635 } else if (T->isEnumeralType()) { 2636 if (FD && FD->isBitField()) 2637 EncodeBitField(this, S, FD); 2638 else 2639 S += 'i'; 2640 } else if (T->isBlockPointerType()) { 2641 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2642 } else if (T->isObjCInterfaceType()) { 2643 // @encode(class_name) 2644 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2645 S += '{'; 2646 const IdentifierInfo *II = OI->getIdentifier(); 2647 S += II->getName(); 2648 S += '='; 2649 llvm::SmallVector<FieldDecl*, 32> RecFields; 2650 CollectObjCIvars(OI, RecFields); 2651 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2652 if (RecFields[i]->isBitField()) 2653 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2654 RecFields[i]); 2655 else 2656 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2657 FD); 2658 } 2659 S += '}'; 2660 } 2661 else 2662 assert(0 && "@encode for type not implemented!"); 2663} 2664 2665void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2666 std::string& S) const { 2667 if (QT & Decl::OBJC_TQ_In) 2668 S += 'n'; 2669 if (QT & Decl::OBJC_TQ_Inout) 2670 S += 'N'; 2671 if (QT & Decl::OBJC_TQ_Out) 2672 S += 'o'; 2673 if (QT & Decl::OBJC_TQ_Bycopy) 2674 S += 'O'; 2675 if (QT & Decl::OBJC_TQ_Byref) 2676 S += 'R'; 2677 if (QT & Decl::OBJC_TQ_Oneway) 2678 S += 'V'; 2679} 2680 2681void ASTContext::setBuiltinVaListType(QualType T) 2682{ 2683 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2684 2685 BuiltinVaListType = T; 2686} 2687 2688void ASTContext::setObjCIdType(QualType T) 2689{ 2690 ObjCIdType = T; 2691 2692 const TypedefType *TT = T->getAsTypedefType(); 2693 if (!TT) 2694 return; 2695 2696 TypedefDecl *TD = TT->getDecl(); 2697 2698 // typedef struct objc_object *id; 2699 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2700 // User error - caller will issue diagnostics. 2701 if (!ptr) 2702 return; 2703 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2704 // User error - caller will issue diagnostics. 2705 if (!rec) 2706 return; 2707 IdStructType = rec; 2708} 2709 2710void ASTContext::setObjCSelType(QualType T) 2711{ 2712 ObjCSelType = T; 2713 2714 const TypedefType *TT = T->getAsTypedefType(); 2715 if (!TT) 2716 return; 2717 TypedefDecl *TD = TT->getDecl(); 2718 2719 // typedef struct objc_selector *SEL; 2720 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2721 if (!ptr) 2722 return; 2723 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2724 if (!rec) 2725 return; 2726 SelStructType = rec; 2727} 2728 2729void ASTContext::setObjCProtoType(QualType QT) 2730{ 2731 ObjCProtoType = QT; 2732} 2733 2734void ASTContext::setObjCClassType(QualType T) 2735{ 2736 ObjCClassType = T; 2737 2738 const TypedefType *TT = T->getAsTypedefType(); 2739 if (!TT) 2740 return; 2741 TypedefDecl *TD = TT->getDecl(); 2742 2743 // typedef struct objc_class *Class; 2744 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2745 assert(ptr && "'Class' incorrectly typed"); 2746 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2747 assert(rec && "'Class' incorrectly typed"); 2748 ClassStructType = rec; 2749} 2750 2751void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 2752 assert(ObjCConstantStringType.isNull() && 2753 "'NSConstantString' type already set!"); 2754 2755 ObjCConstantStringType = getObjCInterfaceType(Decl); 2756} 2757 2758/// \brief Retrieve the template name that represents a qualified 2759/// template name such as \c std::vector. 2760TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 2761 bool TemplateKeyword, 2762 TemplateDecl *Template) { 2763 llvm::FoldingSetNodeID ID; 2764 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 2765 2766 void *InsertPos = 0; 2767 QualifiedTemplateName *QTN = 2768 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2769 if (!QTN) { 2770 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 2771 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 2772 } 2773 2774 return TemplateName(QTN); 2775} 2776 2777/// \brief Retrieve the template name that represents a dependent 2778/// template name such as \c MetaFun::template apply. 2779TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 2780 const IdentifierInfo *Name) { 2781 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 2782 2783 llvm::FoldingSetNodeID ID; 2784 DependentTemplateName::Profile(ID, NNS, Name); 2785 2786 void *InsertPos = 0; 2787 DependentTemplateName *QTN = 2788 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2789 2790 if (QTN) 2791 return TemplateName(QTN); 2792 2793 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2794 if (CanonNNS == NNS) { 2795 QTN = new (*this,4) DependentTemplateName(NNS, Name); 2796 } else { 2797 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 2798 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 2799 } 2800 2801 DependentTemplateNames.InsertNode(QTN, InsertPos); 2802 return TemplateName(QTN); 2803} 2804 2805/// getFromTargetType - Given one of the integer types provided by 2806/// TargetInfo, produce the corresponding type. The unsigned @p Type 2807/// is actually a value of type @c TargetInfo::IntType. 2808QualType ASTContext::getFromTargetType(unsigned Type) const { 2809 switch (Type) { 2810 case TargetInfo::NoInt: return QualType(); 2811 case TargetInfo::SignedShort: return ShortTy; 2812 case TargetInfo::UnsignedShort: return UnsignedShortTy; 2813 case TargetInfo::SignedInt: return IntTy; 2814 case TargetInfo::UnsignedInt: return UnsignedIntTy; 2815 case TargetInfo::SignedLong: return LongTy; 2816 case TargetInfo::UnsignedLong: return UnsignedLongTy; 2817 case TargetInfo::SignedLongLong: return LongLongTy; 2818 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 2819 } 2820 2821 assert(false && "Unhandled TargetInfo::IntType value"); 2822 return QualType(); 2823} 2824 2825//===----------------------------------------------------------------------===// 2826// Type Predicates. 2827//===----------------------------------------------------------------------===// 2828 2829/// isObjCNSObjectType - Return true if this is an NSObject object using 2830/// NSObject attribute on a c-style pointer type. 2831/// FIXME - Make it work directly on types. 2832/// 2833bool ASTContext::isObjCNSObjectType(QualType Ty) const { 2834 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2835 if (TypedefDecl *TD = TDT->getDecl()) 2836 if (TD->getAttr<ObjCNSObjectAttr>(*const_cast<ASTContext*>(this))) 2837 return true; 2838 } 2839 return false; 2840} 2841 2842/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 2843/// to an object type. This includes "id" and "Class" (two 'special' pointers 2844/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 2845/// ID type). 2846bool ASTContext::isObjCObjectPointerType(QualType Ty) const { 2847 if (Ty->isObjCQualifiedIdType()) 2848 return true; 2849 2850 // Blocks are objects. 2851 if (Ty->isBlockPointerType()) 2852 return true; 2853 2854 // All other object types are pointers. 2855 const PointerType *PT = Ty->getAsPointerType(); 2856 if (PT == 0) 2857 return false; 2858 2859 // If this a pointer to an interface (e.g. NSString*), it is ok. 2860 if (PT->getPointeeType()->isObjCInterfaceType() || 2861 // If is has NSObject attribute, OK as well. 2862 isObjCNSObjectType(Ty)) 2863 return true; 2864 2865 // Check to see if this is 'id' or 'Class', both of which are typedefs for 2866 // pointer types. This looks for the typedef specifically, not for the 2867 // underlying type. Iteratively strip off typedefs so that we can handle 2868 // typedefs of typedefs. 2869 while (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2870 if (Ty.getUnqualifiedType() == getObjCIdType() || 2871 Ty.getUnqualifiedType() == getObjCClassType()) 2872 return true; 2873 2874 Ty = TDT->getDecl()->getUnderlyingType(); 2875 } 2876 2877 return false; 2878} 2879 2880/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 2881/// garbage collection attribute. 2882/// 2883QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 2884 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 2885 if (getLangOptions().ObjC1 && 2886 getLangOptions().getGCMode() != LangOptions::NonGC) { 2887 GCAttrs = Ty.getObjCGCAttr(); 2888 // Default behavious under objective-c's gc is for objective-c pointers 2889 // (or pointers to them) be treated as though they were declared 2890 // as __strong. 2891 if (GCAttrs == QualType::GCNone) { 2892 if (isObjCObjectPointerType(Ty)) 2893 GCAttrs = QualType::Strong; 2894 else if (Ty->isPointerType()) 2895 return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType()); 2896 } 2897 // Non-pointers have none gc'able attribute regardless of the attribute 2898 // set on them. 2899 else if (!Ty->isPointerType() && !isObjCObjectPointerType(Ty)) 2900 return QualType::GCNone; 2901 } 2902 return GCAttrs; 2903} 2904 2905//===----------------------------------------------------------------------===// 2906// Type Compatibility Testing 2907//===----------------------------------------------------------------------===// 2908 2909/// areCompatVectorTypes - Return true if the two specified vector types are 2910/// compatible. 2911static bool areCompatVectorTypes(const VectorType *LHS, 2912 const VectorType *RHS) { 2913 assert(LHS->isCanonical() && RHS->isCanonical()); 2914 return LHS->getElementType() == RHS->getElementType() && 2915 LHS->getNumElements() == RHS->getNumElements(); 2916} 2917 2918/// canAssignObjCInterfaces - Return true if the two interface types are 2919/// compatible for assignment from RHS to LHS. This handles validation of any 2920/// protocol qualifiers on the LHS or RHS. 2921/// 2922bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 2923 const ObjCInterfaceType *RHS) { 2924 // Verify that the base decls are compatible: the RHS must be a subclass of 2925 // the LHS. 2926 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 2927 return false; 2928 2929 // RHS must have a superset of the protocols in the LHS. If the LHS is not 2930 // protocol qualified at all, then we are good. 2931 if (!isa<ObjCQualifiedInterfaceType>(LHS)) 2932 return true; 2933 2934 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 2935 // isn't a superset. 2936 if (!isa<ObjCQualifiedInterfaceType>(RHS)) 2937 return true; // FIXME: should return false! 2938 2939 // Finally, we must have two protocol-qualified interfaces. 2940 const ObjCQualifiedInterfaceType *LHSP =cast<ObjCQualifiedInterfaceType>(LHS); 2941 const ObjCQualifiedInterfaceType *RHSP =cast<ObjCQualifiedInterfaceType>(RHS); 2942 2943 // All LHS protocols must have a presence on the RHS. 2944 assert(LHSP->qual_begin() != LHSP->qual_end() && "Empty LHS protocol list?"); 2945 2946 for (ObjCQualifiedInterfaceType::qual_iterator LHSPI = LHSP->qual_begin(), 2947 LHSPE = LHSP->qual_end(); 2948 LHSPI != LHSPE; LHSPI++) { 2949 bool RHSImplementsProtocol = false; 2950 2951 // If the RHS doesn't implement the protocol on the left, the types 2952 // are incompatible. 2953 for (ObjCQualifiedInterfaceType::qual_iterator RHSPI = RHSP->qual_begin(), 2954 RHSPE = RHSP->qual_end(); 2955 !RHSImplementsProtocol && (RHSPI != RHSPE); RHSPI++) { 2956 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) 2957 RHSImplementsProtocol = true; 2958 } 2959 // FIXME: For better diagnostics, consider passing back the protocol name. 2960 if (!RHSImplementsProtocol) 2961 return false; 2962 } 2963 // The RHS implements all protocols listed on the LHS. 2964 return true; 2965} 2966 2967bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 2968 // get the "pointed to" types 2969 const PointerType *LHSPT = LHS->getAsPointerType(); 2970 const PointerType *RHSPT = RHS->getAsPointerType(); 2971 2972 if (!LHSPT || !RHSPT) 2973 return false; 2974 2975 QualType lhptee = LHSPT->getPointeeType(); 2976 QualType rhptee = RHSPT->getPointeeType(); 2977 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2978 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2979 // ID acts sort of like void* for ObjC interfaces 2980 if (LHSIface && isObjCIdStructType(rhptee)) 2981 return true; 2982 if (RHSIface && isObjCIdStructType(lhptee)) 2983 return true; 2984 if (!LHSIface || !RHSIface) 2985 return false; 2986 return canAssignObjCInterfaces(LHSIface, RHSIface) || 2987 canAssignObjCInterfaces(RHSIface, LHSIface); 2988} 2989 2990/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 2991/// both shall have the identically qualified version of a compatible type. 2992/// C99 6.2.7p1: Two types have compatible types if their types are the 2993/// same. See 6.7.[2,3,5] for additional rules. 2994bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 2995 return !mergeTypes(LHS, RHS).isNull(); 2996} 2997 2998QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 2999 const FunctionType *lbase = lhs->getAsFunctionType(); 3000 const FunctionType *rbase = rhs->getAsFunctionType(); 3001 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3002 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3003 bool allLTypes = true; 3004 bool allRTypes = true; 3005 3006 // Check return type 3007 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3008 if (retType.isNull()) return QualType(); 3009 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3010 allLTypes = false; 3011 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3012 allRTypes = false; 3013 3014 if (lproto && rproto) { // two C99 style function prototypes 3015 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3016 "C++ shouldn't be here"); 3017 unsigned lproto_nargs = lproto->getNumArgs(); 3018 unsigned rproto_nargs = rproto->getNumArgs(); 3019 3020 // Compatible functions must have the same number of arguments 3021 if (lproto_nargs != rproto_nargs) 3022 return QualType(); 3023 3024 // Variadic and non-variadic functions aren't compatible 3025 if (lproto->isVariadic() != rproto->isVariadic()) 3026 return QualType(); 3027 3028 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3029 return QualType(); 3030 3031 // Check argument compatibility 3032 llvm::SmallVector<QualType, 10> types; 3033 for (unsigned i = 0; i < lproto_nargs; i++) { 3034 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3035 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3036 QualType argtype = mergeTypes(largtype, rargtype); 3037 if (argtype.isNull()) return QualType(); 3038 types.push_back(argtype); 3039 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3040 allLTypes = false; 3041 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3042 allRTypes = false; 3043 } 3044 if (allLTypes) return lhs; 3045 if (allRTypes) return rhs; 3046 return getFunctionType(retType, types.begin(), types.size(), 3047 lproto->isVariadic(), lproto->getTypeQuals()); 3048 } 3049 3050 if (lproto) allRTypes = false; 3051 if (rproto) allLTypes = false; 3052 3053 const FunctionProtoType *proto = lproto ? lproto : rproto; 3054 if (proto) { 3055 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3056 if (proto->isVariadic()) return QualType(); 3057 // Check that the types are compatible with the types that 3058 // would result from default argument promotions (C99 6.7.5.3p15). 3059 // The only types actually affected are promotable integer 3060 // types and floats, which would be passed as a different 3061 // type depending on whether the prototype is visible. 3062 unsigned proto_nargs = proto->getNumArgs(); 3063 for (unsigned i = 0; i < proto_nargs; ++i) { 3064 QualType argTy = proto->getArgType(i); 3065 if (argTy->isPromotableIntegerType() || 3066 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3067 return QualType(); 3068 } 3069 3070 if (allLTypes) return lhs; 3071 if (allRTypes) return rhs; 3072 return getFunctionType(retType, proto->arg_type_begin(), 3073 proto->getNumArgs(), lproto->isVariadic(), 3074 lproto->getTypeQuals()); 3075 } 3076 3077 if (allLTypes) return lhs; 3078 if (allRTypes) return rhs; 3079 return getFunctionNoProtoType(retType); 3080} 3081 3082QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3083 // C++ [expr]: If an expression initially has the type "reference to T", the 3084 // type is adjusted to "T" prior to any further analysis, the expression 3085 // designates the object or function denoted by the reference, and the 3086 // expression is an lvalue unless the reference is an rvalue reference and 3087 // the expression is a function call (possibly inside parentheses). 3088 // FIXME: C++ shouldn't be going through here! The rules are different 3089 // enough that they should be handled separately. 3090 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3091 // shouldn't be going through here! 3092 if (const ReferenceType *RT = LHS->getAsReferenceType()) 3093 LHS = RT->getPointeeType(); 3094 if (const ReferenceType *RT = RHS->getAsReferenceType()) 3095 RHS = RT->getPointeeType(); 3096 3097 QualType LHSCan = getCanonicalType(LHS), 3098 RHSCan = getCanonicalType(RHS); 3099 3100 // If two types are identical, they are compatible. 3101 if (LHSCan == RHSCan) 3102 return LHS; 3103 3104 // If the qualifiers are different, the types aren't compatible 3105 // Note that we handle extended qualifiers later, in the 3106 // case for ExtQualType. 3107 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3108 return QualType(); 3109 3110 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3111 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3112 3113 // We want to consider the two function types to be the same for these 3114 // comparisons, just force one to the other. 3115 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3116 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3117 3118 // Strip off objc_gc attributes off the top level so they can be merged. 3119 // This is a complete mess, but the attribute itself doesn't make much sense. 3120 if (RHSClass == Type::ExtQual) { 3121 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3122 if (GCAttr != QualType::GCNone) { 3123 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3124 // __weak attribute must appear on both declarations. 3125 // __strong attribue is redundant if other decl is an objective-c 3126 // object pointer (or decorated with __strong attribute); otherwise 3127 // issue error. 3128 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3129 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3130 LHSCan->isPointerType() && !isObjCObjectPointerType(LHSCan) && 3131 !isObjCIdStructType(LHSCan->getAsPointerType()->getPointeeType()))) 3132 return QualType(); 3133 3134 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3135 RHS.getCVRQualifiers()); 3136 QualType Result = mergeTypes(LHS, RHS); 3137 if (!Result.isNull()) { 3138 if (Result.getObjCGCAttr() == QualType::GCNone) 3139 Result = getObjCGCQualType(Result, GCAttr); 3140 else if (Result.getObjCGCAttr() != GCAttr) 3141 Result = QualType(); 3142 } 3143 return Result; 3144 } 3145 } 3146 if (LHSClass == Type::ExtQual) { 3147 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3148 if (GCAttr != QualType::GCNone) { 3149 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3150 // __weak attribute must appear on both declarations. __strong 3151 // __strong attribue is redundant if other decl is an objective-c 3152 // object pointer (or decorated with __strong attribute); otherwise 3153 // issue error. 3154 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3155 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3156 RHSCan->isPointerType() && !isObjCObjectPointerType(RHSCan) && 3157 !isObjCIdStructType(RHSCan->getAsPointerType()->getPointeeType()))) 3158 return QualType(); 3159 3160 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3161 LHS.getCVRQualifiers()); 3162 QualType Result = mergeTypes(LHS, RHS); 3163 if (!Result.isNull()) { 3164 if (Result.getObjCGCAttr() == QualType::GCNone) 3165 Result = getObjCGCQualType(Result, GCAttr); 3166 else if (Result.getObjCGCAttr() != GCAttr) 3167 Result = QualType(); 3168 } 3169 return Result; 3170 } 3171 } 3172 3173 // Same as above for arrays 3174 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3175 LHSClass = Type::ConstantArray; 3176 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3177 RHSClass = Type::ConstantArray; 3178 3179 // Canonicalize ExtVector -> Vector. 3180 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3181 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3182 3183 // Consider qualified interfaces and interfaces the same. 3184 if (LHSClass == Type::ObjCQualifiedInterface) LHSClass = Type::ObjCInterface; 3185 if (RHSClass == Type::ObjCQualifiedInterface) RHSClass = Type::ObjCInterface; 3186 3187 // If the canonical type classes don't match. 3188 if (LHSClass != RHSClass) { 3189 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3190 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3191 3192 // 'id' and 'Class' act sort of like void* for ObjC interfaces 3193 if (LHSIface && (isObjCIdStructType(RHS) || isObjCClassStructType(RHS))) 3194 return LHS; 3195 if (RHSIface && (isObjCIdStructType(LHS) || isObjCClassStructType(LHS))) 3196 return RHS; 3197 3198 // ID is compatible with all qualified id types. 3199 if (LHS->isObjCQualifiedIdType()) { 3200 if (const PointerType *PT = RHS->getAsPointerType()) { 3201 QualType pType = PT->getPointeeType(); 3202 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3203 return LHS; 3204 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3205 // Unfortunately, this API is part of Sema (which we don't have access 3206 // to. Need to refactor. The following check is insufficient, since we 3207 // need to make sure the class implements the protocol. 3208 if (pType->isObjCInterfaceType()) 3209 return LHS; 3210 } 3211 } 3212 if (RHS->isObjCQualifiedIdType()) { 3213 if (const PointerType *PT = LHS->getAsPointerType()) { 3214 QualType pType = PT->getPointeeType(); 3215 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3216 return RHS; 3217 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3218 // Unfortunately, this API is part of Sema (which we don't have access 3219 // to. Need to refactor. The following check is insufficient, since we 3220 // need to make sure the class implements the protocol. 3221 if (pType->isObjCInterfaceType()) 3222 return RHS; 3223 } 3224 } 3225 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3226 // a signed integer type, or an unsigned integer type. 3227 if (const EnumType* ETy = LHS->getAsEnumType()) { 3228 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3229 return RHS; 3230 } 3231 if (const EnumType* ETy = RHS->getAsEnumType()) { 3232 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3233 return LHS; 3234 } 3235 3236 return QualType(); 3237 } 3238 3239 // The canonical type classes match. 3240 switch (LHSClass) { 3241#define TYPE(Class, Base) 3242#define ABSTRACT_TYPE(Class, Base) 3243#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3244#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3245#include "clang/AST/TypeNodes.def" 3246 assert(false && "Non-canonical and dependent types shouldn't get here"); 3247 return QualType(); 3248 3249 case Type::LValueReference: 3250 case Type::RValueReference: 3251 case Type::MemberPointer: 3252 assert(false && "C++ should never be in mergeTypes"); 3253 return QualType(); 3254 3255 case Type::IncompleteArray: 3256 case Type::VariableArray: 3257 case Type::FunctionProto: 3258 case Type::ExtVector: 3259 case Type::ObjCQualifiedInterface: 3260 assert(false && "Types are eliminated above"); 3261 return QualType(); 3262 3263 case Type::Pointer: 3264 { 3265 // Merge two pointer types, while trying to preserve typedef info 3266 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 3267 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 3268 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3269 if (ResultType.isNull()) return QualType(); 3270 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3271 return LHS; 3272 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3273 return RHS; 3274 return getPointerType(ResultType); 3275 } 3276 case Type::BlockPointer: 3277 { 3278 // Merge two block pointer types, while trying to preserve typedef info 3279 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 3280 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 3281 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3282 if (ResultType.isNull()) return QualType(); 3283 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3284 return LHS; 3285 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3286 return RHS; 3287 return getBlockPointerType(ResultType); 3288 } 3289 case Type::ConstantArray: 3290 { 3291 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3292 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3293 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3294 return QualType(); 3295 3296 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3297 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3298 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3299 if (ResultType.isNull()) return QualType(); 3300 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3301 return LHS; 3302 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3303 return RHS; 3304 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3305 ArrayType::ArraySizeModifier(), 0); 3306 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3307 ArrayType::ArraySizeModifier(), 0); 3308 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3309 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3310 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3311 return LHS; 3312 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3313 return RHS; 3314 if (LVAT) { 3315 // FIXME: This isn't correct! But tricky to implement because 3316 // the array's size has to be the size of LHS, but the type 3317 // has to be different. 3318 return LHS; 3319 } 3320 if (RVAT) { 3321 // FIXME: This isn't correct! But tricky to implement because 3322 // the array's size has to be the size of RHS, but the type 3323 // has to be different. 3324 return RHS; 3325 } 3326 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3327 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3328 return getIncompleteArrayType(ResultType, ArrayType::ArraySizeModifier(),0); 3329 } 3330 case Type::FunctionNoProto: 3331 return mergeFunctionTypes(LHS, RHS); 3332 case Type::Record: 3333 case Type::Enum: 3334 // FIXME: Why are these compatible? 3335 if (isObjCIdStructType(LHS) && isObjCClassStructType(RHS)) return LHS; 3336 if (isObjCClassStructType(LHS) && isObjCIdStructType(RHS)) return LHS; 3337 return QualType(); 3338 case Type::Builtin: 3339 // Only exactly equal builtin types are compatible, which is tested above. 3340 return QualType(); 3341 case Type::Complex: 3342 // Distinct complex types are incompatible. 3343 return QualType(); 3344 case Type::Vector: 3345 // FIXME: The merged type should be an ExtVector! 3346 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3347 return LHS; 3348 return QualType(); 3349 case Type::ObjCInterface: { 3350 // Check if the interfaces are assignment compatible. 3351 // FIXME: This should be type compatibility, e.g. whether 3352 // "LHS x; RHS x;" at global scope is legal. 3353 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3354 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3355 if (LHSIface && RHSIface && 3356 canAssignObjCInterfaces(LHSIface, RHSIface)) 3357 return LHS; 3358 3359 return QualType(); 3360 } 3361 case Type::ObjCObjectPointer: 3362 // FIXME: finish 3363 // Distinct qualified id's are not compatible. 3364 return QualType(); 3365 case Type::FixedWidthInt: 3366 // Distinct fixed-width integers are not compatible. 3367 return QualType(); 3368 case Type::ExtQual: 3369 // FIXME: ExtQual types can be compatible even if they're not 3370 // identical! 3371 return QualType(); 3372 // First attempt at an implementation, but I'm not really sure it's 3373 // right... 3374#if 0 3375 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3376 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3377 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3378 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3379 return QualType(); 3380 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3381 LHSBase = QualType(LQual->getBaseType(), 0); 3382 RHSBase = QualType(RQual->getBaseType(), 0); 3383 ResultType = mergeTypes(LHSBase, RHSBase); 3384 if (ResultType.isNull()) return QualType(); 3385 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3386 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3387 return LHS; 3388 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3389 return RHS; 3390 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3391 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3392 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3393 return ResultType; 3394#endif 3395 3396 case Type::TemplateSpecialization: 3397 assert(false && "Dependent types have no size"); 3398 break; 3399 } 3400 3401 return QualType(); 3402} 3403 3404//===----------------------------------------------------------------------===// 3405// Integer Predicates 3406//===----------------------------------------------------------------------===// 3407 3408unsigned ASTContext::getIntWidth(QualType T) { 3409 if (T == BoolTy) 3410 return 1; 3411 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3412 return FWIT->getWidth(); 3413 } 3414 // For builtin types, just use the standard type sizing method 3415 return (unsigned)getTypeSize(T); 3416} 3417 3418QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3419 assert(T->isSignedIntegerType() && "Unexpected type"); 3420 if (const EnumType* ETy = T->getAsEnumType()) 3421 T = ETy->getDecl()->getIntegerType(); 3422 const BuiltinType* BTy = T->getAsBuiltinType(); 3423 assert (BTy && "Unexpected signed integer type"); 3424 switch (BTy->getKind()) { 3425 case BuiltinType::Char_S: 3426 case BuiltinType::SChar: 3427 return UnsignedCharTy; 3428 case BuiltinType::Short: 3429 return UnsignedShortTy; 3430 case BuiltinType::Int: 3431 return UnsignedIntTy; 3432 case BuiltinType::Long: 3433 return UnsignedLongTy; 3434 case BuiltinType::LongLong: 3435 return UnsignedLongLongTy; 3436 case BuiltinType::Int128: 3437 return UnsignedInt128Ty; 3438 default: 3439 assert(0 && "Unexpected signed integer type"); 3440 return QualType(); 3441 } 3442} 3443 3444ExternalASTSource::~ExternalASTSource() { } 3445 3446void ExternalASTSource::PrintStats() { } 3447 3448 3449//===----------------------------------------------------------------------===// 3450// Builtin Type Computation 3451//===----------------------------------------------------------------------===// 3452 3453/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3454/// pointer over the consumed characters. This returns the resultant type. 3455static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3456 ASTContext::GetBuiltinTypeError &Error, 3457 bool AllowTypeModifiers = true) { 3458 // Modifiers. 3459 int HowLong = 0; 3460 bool Signed = false, Unsigned = false; 3461 3462 // Read the modifiers first. 3463 bool Done = false; 3464 while (!Done) { 3465 switch (*Str++) { 3466 default: Done = true; --Str; break; 3467 case 'S': 3468 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3469 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3470 Signed = true; 3471 break; 3472 case 'U': 3473 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 3474 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 3475 Unsigned = true; 3476 break; 3477 case 'L': 3478 assert(HowLong <= 2 && "Can't have LLLL modifier"); 3479 ++HowLong; 3480 break; 3481 } 3482 } 3483 3484 QualType Type; 3485 3486 // Read the base type. 3487 switch (*Str++) { 3488 default: assert(0 && "Unknown builtin type letter!"); 3489 case 'v': 3490 assert(HowLong == 0 && !Signed && !Unsigned && 3491 "Bad modifiers used with 'v'!"); 3492 Type = Context.VoidTy; 3493 break; 3494 case 'f': 3495 assert(HowLong == 0 && !Signed && !Unsigned && 3496 "Bad modifiers used with 'f'!"); 3497 Type = Context.FloatTy; 3498 break; 3499 case 'd': 3500 assert(HowLong < 2 && !Signed && !Unsigned && 3501 "Bad modifiers used with 'd'!"); 3502 if (HowLong) 3503 Type = Context.LongDoubleTy; 3504 else 3505 Type = Context.DoubleTy; 3506 break; 3507 case 's': 3508 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 3509 if (Unsigned) 3510 Type = Context.UnsignedShortTy; 3511 else 3512 Type = Context.ShortTy; 3513 break; 3514 case 'i': 3515 if (HowLong == 3) 3516 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 3517 else if (HowLong == 2) 3518 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 3519 else if (HowLong == 1) 3520 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 3521 else 3522 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 3523 break; 3524 case 'c': 3525 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 3526 if (Signed) 3527 Type = Context.SignedCharTy; 3528 else if (Unsigned) 3529 Type = Context.UnsignedCharTy; 3530 else 3531 Type = Context.CharTy; 3532 break; 3533 case 'b': // boolean 3534 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 3535 Type = Context.BoolTy; 3536 break; 3537 case 'z': // size_t. 3538 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 3539 Type = Context.getSizeType(); 3540 break; 3541 case 'F': 3542 Type = Context.getCFConstantStringType(); 3543 break; 3544 case 'a': 3545 Type = Context.getBuiltinVaListType(); 3546 assert(!Type.isNull() && "builtin va list type not initialized!"); 3547 break; 3548 case 'A': 3549 // This is a "reference" to a va_list; however, what exactly 3550 // this means depends on how va_list is defined. There are two 3551 // different kinds of va_list: ones passed by value, and ones 3552 // passed by reference. An example of a by-value va_list is 3553 // x86, where va_list is a char*. An example of by-ref va_list 3554 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 3555 // we want this argument to be a char*&; for x86-64, we want 3556 // it to be a __va_list_tag*. 3557 Type = Context.getBuiltinVaListType(); 3558 assert(!Type.isNull() && "builtin va list type not initialized!"); 3559 if (Type->isArrayType()) { 3560 Type = Context.getArrayDecayedType(Type); 3561 } else { 3562 Type = Context.getLValueReferenceType(Type); 3563 } 3564 break; 3565 case 'V': { 3566 char *End; 3567 3568 unsigned NumElements = strtoul(Str, &End, 10); 3569 assert(End != Str && "Missing vector size"); 3570 3571 Str = End; 3572 3573 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 3574 Type = Context.getVectorType(ElementType, NumElements); 3575 break; 3576 } 3577 case 'P': { 3578 IdentifierInfo *II = &Context.Idents.get("FILE"); 3579 DeclContext::lookup_result Lookup 3580 = Context.getTranslationUnitDecl()->lookup(Context, II); 3581 if (Lookup.first != Lookup.second && isa<TypeDecl>(*Lookup.first)) { 3582 Type = Context.getTypeDeclType(cast<TypeDecl>(*Lookup.first)); 3583 break; 3584 } 3585 else { 3586 Error = ASTContext::GE_Missing_FILE; 3587 return QualType(); 3588 } 3589 } 3590 } 3591 3592 if (!AllowTypeModifiers) 3593 return Type; 3594 3595 Done = false; 3596 while (!Done) { 3597 switch (*Str++) { 3598 default: Done = true; --Str; break; 3599 case '*': 3600 Type = Context.getPointerType(Type); 3601 break; 3602 case '&': 3603 Type = Context.getLValueReferenceType(Type); 3604 break; 3605 // FIXME: There's no way to have a built-in with an rvalue ref arg. 3606 case 'C': 3607 Type = Type.getQualifiedType(QualType::Const); 3608 break; 3609 } 3610 } 3611 3612 return Type; 3613} 3614 3615/// GetBuiltinType - Return the type for the specified builtin. 3616QualType ASTContext::GetBuiltinType(unsigned id, 3617 GetBuiltinTypeError &Error) { 3618 const char *TypeStr = BuiltinInfo.GetTypeString(id); 3619 3620 llvm::SmallVector<QualType, 8> ArgTypes; 3621 3622 Error = GE_None; 3623 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 3624 if (Error != GE_None) 3625 return QualType(); 3626 while (TypeStr[0] && TypeStr[0] != '.') { 3627 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 3628 if (Error != GE_None) 3629 return QualType(); 3630 3631 // Do array -> pointer decay. The builtin should use the decayed type. 3632 if (Ty->isArrayType()) 3633 Ty = getArrayDecayedType(Ty); 3634 3635 ArgTypes.push_back(Ty); 3636 } 3637 3638 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 3639 "'.' should only occur at end of builtin type list!"); 3640 3641 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 3642 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 3643 return getFunctionNoProtoType(ResType); 3644 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 3645 TypeStr[0] == '.', 0); 3646} 3647