ASTContext.cpp revision 40b598eea1310ec9ed554d56ce3e25b34c585458
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), PrintingPolicy(LOpts) { 42 if (size_reserve > 0) Types.reserve(size_reserve); 43 InitBuiltinTypes(); 44 TUDecl = TranslationUnitDecl::Create(*this); 45} 46 47ASTContext::~ASTContext() { 48 // Deallocate all the types. 49 while (!Types.empty()) { 50 Types.back()->Destroy(*this); 51 Types.pop_back(); 52 } 53 54 { 55 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 56 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 57 while (I != E) { 58 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 59 delete R; 60 } 61 } 62 63 { 64 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 65 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 66 while (I != E) { 67 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 68 delete R; 69 } 70 } 71 72 // Destroy nested-name-specifiers. 73 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 74 NNS = NestedNameSpecifiers.begin(), 75 NNSEnd = NestedNameSpecifiers.end(); 76 NNS != NNSEnd; 77 /* Increment in loop */) 78 (*NNS++).Destroy(*this); 79 80 if (GlobalNestedNameSpecifier) 81 GlobalNestedNameSpecifier->Destroy(*this); 82 83 TUDecl->Destroy(*this); 84} 85 86void 87ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 88 ExternalSource.reset(Source.take()); 89} 90 91void ASTContext::PrintStats() const { 92 fprintf(stderr, "*** AST Context Stats:\n"); 93 fprintf(stderr, " %d types total.\n", (int)Types.size()); 94 95 unsigned counts[] = { 96#define TYPE(Name, Parent) 0, 97#define ABSTRACT_TYPE(Name, Parent) 98#include "clang/AST/TypeNodes.def" 99 0 // Extra 100 }; 101 102 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 103 Type *T = Types[i]; 104 counts[(unsigned)T->getTypeClass()]++; 105 } 106 107 unsigned Idx = 0; 108 unsigned TotalBytes = 0; 109#define TYPE(Name, Parent) \ 110 if (counts[Idx]) \ 111 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 112 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 113 ++Idx; 114#define ABSTRACT_TYPE(Name, Parent) 115#include "clang/AST/TypeNodes.def" 116 117 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 118 119 if (ExternalSource.get()) { 120 fprintf(stderr, "\n"); 121 ExternalSource->PrintStats(); 122 } 123} 124 125 126void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 127 Types.push_back((R = QualType(new (*this,8) BuiltinType(K),0)).getTypePtr()); 128} 129 130void ASTContext::InitBuiltinTypes() { 131 assert(VoidTy.isNull() && "Context reinitialized?"); 132 133 // C99 6.2.5p19. 134 InitBuiltinType(VoidTy, BuiltinType::Void); 135 136 // C99 6.2.5p2. 137 InitBuiltinType(BoolTy, BuiltinType::Bool); 138 // C99 6.2.5p3. 139 if (LangOpts.CharIsSigned) 140 InitBuiltinType(CharTy, BuiltinType::Char_S); 141 else 142 InitBuiltinType(CharTy, BuiltinType::Char_U); 143 // C99 6.2.5p4. 144 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 145 InitBuiltinType(ShortTy, BuiltinType::Short); 146 InitBuiltinType(IntTy, BuiltinType::Int); 147 InitBuiltinType(LongTy, BuiltinType::Long); 148 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 149 150 // C99 6.2.5p6. 151 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 152 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 153 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 154 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 155 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 156 157 // C99 6.2.5p10. 158 InitBuiltinType(FloatTy, BuiltinType::Float); 159 InitBuiltinType(DoubleTy, BuiltinType::Double); 160 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 161 162 // GNU extension, 128-bit integers. 163 InitBuiltinType(Int128Ty, BuiltinType::Int128); 164 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 165 166 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 167 InitBuiltinType(WCharTy, BuiltinType::WChar); 168 else // C99 169 WCharTy = getFromTargetType(Target.getWCharType()); 170 171 // Placeholder type for functions. 172 InitBuiltinType(OverloadTy, BuiltinType::Overload); 173 174 // Placeholder type for type-dependent expressions whose type is 175 // completely unknown. No code should ever check a type against 176 // DependentTy and users should never see it; however, it is here to 177 // help diagnose failures to properly check for type-dependent 178 // expressions. 179 InitBuiltinType(DependentTy, BuiltinType::Dependent); 180 181 // Placeholder type for C++0x auto declarations whose real type has 182 // not yet been deduced. 183 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 184 185 // C99 6.2.5p11. 186 FloatComplexTy = getComplexType(FloatTy); 187 DoubleComplexTy = getComplexType(DoubleTy); 188 LongDoubleComplexTy = getComplexType(LongDoubleTy); 189 190 BuiltinVaListType = QualType(); 191 ObjCIdType = QualType(); 192 IdStructType = 0; 193 ObjCClassType = QualType(); 194 ClassStructType = 0; 195 196 ObjCConstantStringType = QualType(); 197 198 // void * type 199 VoidPtrTy = getPointerType(VoidTy); 200 201 // nullptr type (C++0x 2.14.7) 202 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 203} 204 205//===----------------------------------------------------------------------===// 206// Type Sizing and Analysis 207//===----------------------------------------------------------------------===// 208 209/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 210/// scalar floating point type. 211const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 212 const BuiltinType *BT = T->getAsBuiltinType(); 213 assert(BT && "Not a floating point type!"); 214 switch (BT->getKind()) { 215 default: assert(0 && "Not a floating point type!"); 216 case BuiltinType::Float: return Target.getFloatFormat(); 217 case BuiltinType::Double: return Target.getDoubleFormat(); 218 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 219 } 220} 221 222/// getDeclAlign - Return a conservative estimate of the alignment of the 223/// specified decl. Note that bitfields do not have a valid alignment, so 224/// this method will assert on them. 225unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 226 unsigned Align = Target.getCharWidth(); 227 228 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 229 Align = std::max(Align, AA->getAlignment()); 230 231 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 232 QualType T = VD->getType(); 233 if (const ReferenceType* RT = T->getAsReferenceType()) { 234 unsigned AS = RT->getPointeeType().getAddressSpace(); 235 Align = Target.getPointerAlign(AS); 236 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 237 // Incomplete or function types default to 1. 238 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 239 T = cast<ArrayType>(T)->getElementType(); 240 241 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 242 } 243 } 244 245 return Align / Target.getCharWidth(); 246} 247 248/// getTypeSize - Return the size of the specified type, in bits. This method 249/// does not work on incomplete types. 250std::pair<uint64_t, unsigned> 251ASTContext::getTypeInfo(const Type *T) { 252 uint64_t Width=0; 253 unsigned Align=8; 254 switch (T->getTypeClass()) { 255#define TYPE(Class, Base) 256#define ABSTRACT_TYPE(Class, Base) 257#define NON_CANONICAL_TYPE(Class, Base) 258#define DEPENDENT_TYPE(Class, Base) case Type::Class: 259#include "clang/AST/TypeNodes.def" 260 assert(false && "Should not see dependent types"); 261 break; 262 263 case Type::FunctionNoProto: 264 case Type::FunctionProto: 265 // GCC extension: alignof(function) = 32 bits 266 Width = 0; 267 Align = 32; 268 break; 269 270 case Type::IncompleteArray: 271 case Type::VariableArray: 272 Width = 0; 273 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 274 break; 275 276 case Type::ConstantArray: { 277 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 278 279 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 280 Width = EltInfo.first*CAT->getSize().getZExtValue(); 281 Align = EltInfo.second; 282 break; 283 } 284 case Type::ExtVector: 285 case Type::Vector: { 286 std::pair<uint64_t, unsigned> EltInfo = 287 getTypeInfo(cast<VectorType>(T)->getElementType()); 288 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 289 Align = Width; 290 // If the alignment is not a power of 2, round up to the next power of 2. 291 // This happens for non-power-of-2 length vectors. 292 // FIXME: this should probably be a target property. 293 Align = 1 << llvm::Log2_32_Ceil(Align); 294 break; 295 } 296 297 case Type::Builtin: 298 switch (cast<BuiltinType>(T)->getKind()) { 299 default: assert(0 && "Unknown builtin type!"); 300 case BuiltinType::Void: 301 // GCC extension: alignof(void) = 8 bits. 302 Width = 0; 303 Align = 8; 304 break; 305 306 case BuiltinType::Bool: 307 Width = Target.getBoolWidth(); 308 Align = Target.getBoolAlign(); 309 break; 310 case BuiltinType::Char_S: 311 case BuiltinType::Char_U: 312 case BuiltinType::UChar: 313 case BuiltinType::SChar: 314 Width = Target.getCharWidth(); 315 Align = Target.getCharAlign(); 316 break; 317 case BuiltinType::WChar: 318 Width = Target.getWCharWidth(); 319 Align = Target.getWCharAlign(); 320 break; 321 case BuiltinType::UShort: 322 case BuiltinType::Short: 323 Width = Target.getShortWidth(); 324 Align = Target.getShortAlign(); 325 break; 326 case BuiltinType::UInt: 327 case BuiltinType::Int: 328 Width = Target.getIntWidth(); 329 Align = Target.getIntAlign(); 330 break; 331 case BuiltinType::ULong: 332 case BuiltinType::Long: 333 Width = Target.getLongWidth(); 334 Align = Target.getLongAlign(); 335 break; 336 case BuiltinType::ULongLong: 337 case BuiltinType::LongLong: 338 Width = Target.getLongLongWidth(); 339 Align = Target.getLongLongAlign(); 340 break; 341 case BuiltinType::Int128: 342 case BuiltinType::UInt128: 343 Width = 128; 344 Align = 128; // int128_t is 128-bit aligned on all targets. 345 break; 346 case BuiltinType::Float: 347 Width = Target.getFloatWidth(); 348 Align = Target.getFloatAlign(); 349 break; 350 case BuiltinType::Double: 351 Width = Target.getDoubleWidth(); 352 Align = Target.getDoubleAlign(); 353 break; 354 case BuiltinType::LongDouble: 355 Width = Target.getLongDoubleWidth(); 356 Align = Target.getLongDoubleAlign(); 357 break; 358 case BuiltinType::NullPtr: 359 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 360 Align = Target.getPointerAlign(0); // == sizeof(void*) 361 break; 362 } 363 break; 364 case Type::FixedWidthInt: 365 // FIXME: This isn't precisely correct; the width/alignment should depend 366 // on the available types for the target 367 Width = cast<FixedWidthIntType>(T)->getWidth(); 368 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 369 Align = Width; 370 break; 371 case Type::ExtQual: 372 // FIXME: Pointers into different addr spaces could have different sizes and 373 // alignment requirements: getPointerInfo should take an AddrSpace. 374 return getTypeInfo(QualType(cast<ExtQualType>(T)->getBaseType(), 0)); 375 case Type::ObjCObjectPointer: 376 case Type::ObjCQualifiedInterface: 377 Width = Target.getPointerWidth(0); 378 Align = Target.getPointerAlign(0); 379 break; 380 case Type::BlockPointer: { 381 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 382 Width = Target.getPointerWidth(AS); 383 Align = Target.getPointerAlign(AS); 384 break; 385 } 386 case Type::Pointer: { 387 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 388 Width = Target.getPointerWidth(AS); 389 Align = Target.getPointerAlign(AS); 390 break; 391 } 392 case Type::LValueReference: 393 case Type::RValueReference: 394 // "When applied to a reference or a reference type, the result is the size 395 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 396 // FIXME: This is wrong for struct layout: a reference in a struct has 397 // pointer size. 398 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 399 case Type::MemberPointer: { 400 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 401 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 402 // If we ever want to support other ABIs this needs to be abstracted. 403 404 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 405 std::pair<uint64_t, unsigned> PtrDiffInfo = 406 getTypeInfo(getPointerDiffType()); 407 Width = PtrDiffInfo.first; 408 if (Pointee->isFunctionType()) 409 Width *= 2; 410 Align = PtrDiffInfo.second; 411 break; 412 } 413 case Type::Complex: { 414 // Complex types have the same alignment as their elements, but twice the 415 // size. 416 std::pair<uint64_t, unsigned> EltInfo = 417 getTypeInfo(cast<ComplexType>(T)->getElementType()); 418 Width = EltInfo.first*2; 419 Align = EltInfo.second; 420 break; 421 } 422 case Type::ObjCInterface: { 423 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 424 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 425 Width = Layout.getSize(); 426 Align = Layout.getAlignment(); 427 break; 428 } 429 case Type::Record: 430 case Type::Enum: { 431 const TagType *TT = cast<TagType>(T); 432 433 if (TT->getDecl()->isInvalidDecl()) { 434 Width = 1; 435 Align = 1; 436 break; 437 } 438 439 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 440 return getTypeInfo(ET->getDecl()->getIntegerType()); 441 442 const RecordType *RT = cast<RecordType>(TT); 443 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 444 Width = Layout.getSize(); 445 Align = Layout.getAlignment(); 446 break; 447 } 448 449 case Type::Typedef: { 450 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 451 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 452 Align = Aligned->getAlignment(); 453 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 454 } else 455 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 456 break; 457 } 458 459 case Type::TypeOfExpr: 460 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 461 .getTypePtr()); 462 463 case Type::TypeOf: 464 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 465 466 case Type::Decltype: 467 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 468 .getTypePtr()); 469 470 case Type::QualifiedName: 471 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 472 473 case Type::TemplateSpecialization: 474 assert(getCanonicalType(T) != T && 475 "Cannot request the size of a dependent type"); 476 // FIXME: this is likely to be wrong once we support template 477 // aliases, since a template alias could refer to a typedef that 478 // has an __aligned__ attribute on it. 479 return getTypeInfo(getCanonicalType(T)); 480 } 481 482 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 483 return std::make_pair(Width, Align); 484} 485 486/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 487/// type for the current target in bits. This can be different than the ABI 488/// alignment in cases where it is beneficial for performance to overalign 489/// a data type. 490unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 491 unsigned ABIAlign = getTypeAlign(T); 492 493 // Double and long long should be naturally aligned if possible. 494 if (const ComplexType* CT = T->getAsComplexType()) 495 T = CT->getElementType().getTypePtr(); 496 if (T->isSpecificBuiltinType(BuiltinType::Double) || 497 T->isSpecificBuiltinType(BuiltinType::LongLong)) 498 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 499 500 return ABIAlign; 501} 502 503 504/// LayoutField - Field layout. 505void ASTRecordLayout::LayoutField(const FieldDecl *FD, unsigned FieldNo, 506 bool IsUnion, unsigned StructPacking, 507 ASTContext &Context) { 508 unsigned FieldPacking = StructPacking; 509 uint64_t FieldOffset = IsUnion ? 0 : Size; 510 uint64_t FieldSize; 511 unsigned FieldAlign; 512 513 // FIXME: Should this override struct packing? Probably we want to 514 // take the minimum? 515 if (const PackedAttr *PA = FD->getAttr<PackedAttr>()) 516 FieldPacking = PA->getAlignment(); 517 518 if (const Expr *BitWidthExpr = FD->getBitWidth()) { 519 // TODO: Need to check this algorithm on other targets! 520 // (tested on Linux-X86) 521 FieldSize = BitWidthExpr->EvaluateAsInt(Context).getZExtValue(); 522 523 std::pair<uint64_t, unsigned> FieldInfo = 524 Context.getTypeInfo(FD->getType()); 525 uint64_t TypeSize = FieldInfo.first; 526 527 // Determine the alignment of this bitfield. The packing 528 // attributes define a maximum and the alignment attribute defines 529 // a minimum. 530 // FIXME: What is the right behavior when the specified alignment 531 // is smaller than the specified packing? 532 FieldAlign = FieldInfo.second; 533 if (FieldPacking) 534 FieldAlign = std::min(FieldAlign, FieldPacking); 535 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 536 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 537 538 // Check if we need to add padding to give the field the correct 539 // alignment. 540 if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize) 541 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 542 543 // Padding members don't affect overall alignment 544 if (!FD->getIdentifier()) 545 FieldAlign = 1; 546 } else { 547 if (FD->getType()->isIncompleteArrayType()) { 548 // This is a flexible array member; we can't directly 549 // query getTypeInfo about these, so we figure it out here. 550 // Flexible array members don't have any size, but they 551 // have to be aligned appropriately for their element type. 552 FieldSize = 0; 553 const ArrayType* ATy = Context.getAsArrayType(FD->getType()); 554 FieldAlign = Context.getTypeAlign(ATy->getElementType()); 555 } else if (const ReferenceType *RT = FD->getType()->getAsReferenceType()) { 556 unsigned AS = RT->getPointeeType().getAddressSpace(); 557 FieldSize = Context.Target.getPointerWidth(AS); 558 FieldAlign = Context.Target.getPointerAlign(AS); 559 } else { 560 std::pair<uint64_t, unsigned> FieldInfo = 561 Context.getTypeInfo(FD->getType()); 562 FieldSize = FieldInfo.first; 563 FieldAlign = FieldInfo.second; 564 } 565 566 // Determine the alignment of this bitfield. The packing 567 // attributes define a maximum and the alignment attribute defines 568 // a minimum. Additionally, the packing alignment must be at least 569 // a byte for non-bitfields. 570 // 571 // FIXME: What is the right behavior when the specified alignment 572 // is smaller than the specified packing? 573 if (FieldPacking) 574 FieldAlign = std::min(FieldAlign, std::max(8U, FieldPacking)); 575 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 576 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 577 578 // Round up the current record size to the field's alignment boundary. 579 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 580 } 581 582 // Place this field at the current location. 583 FieldOffsets[FieldNo] = FieldOffset; 584 585 // Reserve space for this field. 586 if (IsUnion) { 587 Size = std::max(Size, FieldSize); 588 } else { 589 Size = FieldOffset + FieldSize; 590 } 591 592 // Remember the next available offset. 593 NextOffset = Size; 594 595 // Remember max struct/class alignment. 596 Alignment = std::max(Alignment, FieldAlign); 597} 598 599static void CollectLocalObjCIvars(ASTContext *Ctx, 600 const ObjCInterfaceDecl *OI, 601 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 602 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 603 E = OI->ivar_end(); I != E; ++I) { 604 ObjCIvarDecl *IVDecl = *I; 605 if (!IVDecl->isInvalidDecl()) 606 Fields.push_back(cast<FieldDecl>(IVDecl)); 607 } 608} 609 610void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 611 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 612 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 613 CollectObjCIvars(SuperClass, Fields); 614 CollectLocalObjCIvars(this, OI, Fields); 615} 616 617/// ShallowCollectObjCIvars - 618/// Collect all ivars, including those synthesized, in the current class. 619/// 620void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 621 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 622 bool CollectSynthesized) { 623 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 624 E = OI->ivar_end(); I != E; ++I) { 625 Ivars.push_back(*I); 626 } 627 if (CollectSynthesized) 628 CollectSynthesizedIvars(OI, Ivars); 629} 630 631void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 632 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 633 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(*this), 634 E = PD->prop_end(*this); I != E; ++I) 635 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 636 Ivars.push_back(Ivar); 637 638 // Also look into nested protocols. 639 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 640 E = PD->protocol_end(); P != E; ++P) 641 CollectProtocolSynthesizedIvars(*P, Ivars); 642} 643 644/// CollectSynthesizedIvars - 645/// This routine collect synthesized ivars for the designated class. 646/// 647void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 648 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 649 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(*this), 650 E = OI->prop_end(*this); I != E; ++I) { 651 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 652 Ivars.push_back(Ivar); 653 } 654 // Also look into interface's protocol list for properties declared 655 // in the protocol and whose ivars are synthesized. 656 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 657 PE = OI->protocol_end(); P != PE; ++P) { 658 ObjCProtocolDecl *PD = (*P); 659 CollectProtocolSynthesizedIvars(PD, Ivars); 660 } 661} 662 663unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 664 unsigned count = 0; 665 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(*this), 666 E = PD->prop_end(*this); I != E; ++I) 667 if ((*I)->getPropertyIvarDecl()) 668 ++count; 669 670 // Also look into nested protocols. 671 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 672 E = PD->protocol_end(); P != E; ++P) 673 count += CountProtocolSynthesizedIvars(*P); 674 return count; 675} 676 677unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) 678{ 679 unsigned count = 0; 680 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(*this), 681 E = OI->prop_end(*this); I != E; ++I) { 682 if ((*I)->getPropertyIvarDecl()) 683 ++count; 684 } 685 // Also look into interface's protocol list for properties declared 686 // in the protocol and whose ivars are synthesized. 687 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 688 PE = OI->protocol_end(); P != PE; ++P) { 689 ObjCProtocolDecl *PD = (*P); 690 count += CountProtocolSynthesizedIvars(PD); 691 } 692 return count; 693} 694 695/// getInterfaceLayoutImpl - Get or compute information about the 696/// layout of the given interface. 697/// 698/// \param Impl - If given, also include the layout of the interface's 699/// implementation. This may differ by including synthesized ivars. 700const ASTRecordLayout & 701ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 702 const ObjCImplementationDecl *Impl) { 703 assert(!D->isForwardDecl() && "Invalid interface decl!"); 704 705 // Look up this layout, if already laid out, return what we have. 706 ObjCContainerDecl *Key = 707 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 708 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 709 return *Entry; 710 711 unsigned FieldCount = D->ivar_size(); 712 // Add in synthesized ivar count if laying out an implementation. 713 if (Impl) { 714 unsigned SynthCount = CountSynthesizedIvars(D); 715 FieldCount += SynthCount; 716 // If there aren't any sythesized ivars then reuse the interface 717 // entry. Note we can't cache this because we simply free all 718 // entries later; however we shouldn't look up implementations 719 // frequently. 720 if (SynthCount == 0) 721 return getObjCLayout(D, 0); 722 } 723 724 ASTRecordLayout *NewEntry = NULL; 725 if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 726 const ASTRecordLayout &SL = getASTObjCInterfaceLayout(SD); 727 unsigned Alignment = SL.getAlignment(); 728 729 // We start laying out ivars not at the end of the superclass 730 // structure, but at the next byte following the last field. 731 uint64_t Size = llvm::RoundUpToAlignment(SL.NextOffset, 8); 732 733 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(Size, Alignment); 734 NewEntry->InitializeLayout(FieldCount); 735 } else { 736 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(); 737 NewEntry->InitializeLayout(FieldCount); 738 } 739 740 unsigned StructPacking = 0; 741 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 742 StructPacking = PA->getAlignment(); 743 744 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 745 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 746 AA->getAlignment())); 747 748 // Layout each ivar sequentially. 749 unsigned i = 0; 750 llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; 751 ShallowCollectObjCIvars(D, Ivars, Impl); 752 for (unsigned k = 0, e = Ivars.size(); k != e; ++k) 753 NewEntry->LayoutField(Ivars[k], i++, false, StructPacking, *this); 754 755 // Finally, round the size of the total struct up to the alignment of the 756 // struct itself. 757 NewEntry->FinalizeLayout(); 758 return *NewEntry; 759} 760 761const ASTRecordLayout & 762ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 763 return getObjCLayout(D, 0); 764} 765 766const ASTRecordLayout & 767ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 768 return getObjCLayout(D->getClassInterface(), D); 769} 770 771/// getASTRecordLayout - Get or compute information about the layout of the 772/// specified record (struct/union/class), which indicates its size and field 773/// position information. 774const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 775 D = D->getDefinition(*this); 776 assert(D && "Cannot get layout of forward declarations!"); 777 778 // Look up this layout, if already laid out, return what we have. 779 const ASTRecordLayout *&Entry = ASTRecordLayouts[D]; 780 if (Entry) return *Entry; 781 782 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 783 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 784 ASTRecordLayout *NewEntry = new ASTRecordLayout(); 785 Entry = NewEntry; 786 787 // FIXME: Avoid linear walk through the fields, if possible. 788 NewEntry->InitializeLayout(std::distance(D->field_begin(*this), 789 D->field_end(*this))); 790 bool IsUnion = D->isUnion(); 791 792 unsigned StructPacking = 0; 793 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 794 StructPacking = PA->getAlignment(); 795 796 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 797 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 798 AA->getAlignment())); 799 800 // Layout each field, for now, just sequentially, respecting alignment. In 801 // the future, this will need to be tweakable by targets. 802 unsigned FieldIdx = 0; 803 for (RecordDecl::field_iterator Field = D->field_begin(*this), 804 FieldEnd = D->field_end(*this); 805 Field != FieldEnd; (void)++Field, ++FieldIdx) 806 NewEntry->LayoutField(*Field, FieldIdx, IsUnion, StructPacking, *this); 807 808 // Finally, round the size of the total struct up to the alignment of the 809 // struct itself. 810 NewEntry->FinalizeLayout(getLangOptions().CPlusPlus); 811 return *NewEntry; 812} 813 814//===----------------------------------------------------------------------===// 815// Type creation/memoization methods 816//===----------------------------------------------------------------------===// 817 818QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 819 QualType CanT = getCanonicalType(T); 820 if (CanT.getAddressSpace() == AddressSpace) 821 return T; 822 823 // If we are composing extended qualifiers together, merge together into one 824 // ExtQualType node. 825 unsigned CVRQuals = T.getCVRQualifiers(); 826 QualType::GCAttrTypes GCAttr = QualType::GCNone; 827 Type *TypeNode = T.getTypePtr(); 828 829 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 830 // If this type already has an address space specified, it cannot get 831 // another one. 832 assert(EQT->getAddressSpace() == 0 && 833 "Type cannot be in multiple addr spaces!"); 834 GCAttr = EQT->getObjCGCAttr(); 835 TypeNode = EQT->getBaseType(); 836 } 837 838 // Check if we've already instantiated this type. 839 llvm::FoldingSetNodeID ID; 840 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 841 void *InsertPos = 0; 842 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 843 return QualType(EXTQy, CVRQuals); 844 845 // If the base type isn't canonical, this won't be a canonical type either, 846 // so fill in the canonical type field. 847 QualType Canonical; 848 if (!TypeNode->isCanonical()) { 849 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 850 851 // Update InsertPos, the previous call could have invalidated it. 852 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 853 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 854 } 855 ExtQualType *New = 856 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 857 ExtQualTypes.InsertNode(New, InsertPos); 858 Types.push_back(New); 859 return QualType(New, CVRQuals); 860} 861 862QualType ASTContext::getObjCGCQualType(QualType T, 863 QualType::GCAttrTypes GCAttr) { 864 QualType CanT = getCanonicalType(T); 865 if (CanT.getObjCGCAttr() == GCAttr) 866 return T; 867 868 if (T->isPointerType()) { 869 QualType Pointee = T->getAsPointerType()->getPointeeType(); 870 if (Pointee->isPointerType()) { 871 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 872 return getPointerType(ResultType); 873 } 874 } 875 // If we are composing extended qualifiers together, merge together into one 876 // ExtQualType node. 877 unsigned CVRQuals = T.getCVRQualifiers(); 878 Type *TypeNode = T.getTypePtr(); 879 unsigned AddressSpace = 0; 880 881 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 882 // If this type already has an address space specified, it cannot get 883 // another one. 884 assert(EQT->getObjCGCAttr() == QualType::GCNone && 885 "Type cannot be in multiple addr spaces!"); 886 AddressSpace = EQT->getAddressSpace(); 887 TypeNode = EQT->getBaseType(); 888 } 889 890 // Check if we've already instantiated an gc qual'd type of this type. 891 llvm::FoldingSetNodeID ID; 892 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 893 void *InsertPos = 0; 894 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 895 return QualType(EXTQy, CVRQuals); 896 897 // If the base type isn't canonical, this won't be a canonical type either, 898 // so fill in the canonical type field. 899 // FIXME: Isn't this also not canonical if the base type is a array 900 // or pointer type? I can't find any documentation for objc_gc, though... 901 QualType Canonical; 902 if (!T->isCanonical()) { 903 Canonical = getObjCGCQualType(CanT, GCAttr); 904 905 // Update InsertPos, the previous call could have invalidated it. 906 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 907 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 908 } 909 ExtQualType *New = 910 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 911 ExtQualTypes.InsertNode(New, InsertPos); 912 Types.push_back(New); 913 return QualType(New, CVRQuals); 914} 915 916/// getComplexType - Return the uniqued reference to the type for a complex 917/// number with the specified element type. 918QualType ASTContext::getComplexType(QualType T) { 919 // Unique pointers, to guarantee there is only one pointer of a particular 920 // structure. 921 llvm::FoldingSetNodeID ID; 922 ComplexType::Profile(ID, T); 923 924 void *InsertPos = 0; 925 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 926 return QualType(CT, 0); 927 928 // If the pointee type isn't canonical, this won't be a canonical type either, 929 // so fill in the canonical type field. 930 QualType Canonical; 931 if (!T->isCanonical()) { 932 Canonical = getComplexType(getCanonicalType(T)); 933 934 // Get the new insert position for the node we care about. 935 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 936 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 937 } 938 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 939 Types.push_back(New); 940 ComplexTypes.InsertNode(New, InsertPos); 941 return QualType(New, 0); 942} 943 944QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 945 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 946 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 947 FixedWidthIntType *&Entry = Map[Width]; 948 if (!Entry) 949 Entry = new FixedWidthIntType(Width, Signed); 950 return QualType(Entry, 0); 951} 952 953/// getPointerType - Return the uniqued reference to the type for a pointer to 954/// the specified type. 955QualType ASTContext::getPointerType(QualType T) { 956 // Unique pointers, to guarantee there is only one pointer of a particular 957 // structure. 958 llvm::FoldingSetNodeID ID; 959 PointerType::Profile(ID, T); 960 961 void *InsertPos = 0; 962 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 963 return QualType(PT, 0); 964 965 // If the pointee type isn't canonical, this won't be a canonical type either, 966 // so fill in the canonical type field. 967 QualType Canonical; 968 if (!T->isCanonical()) { 969 Canonical = getPointerType(getCanonicalType(T)); 970 971 // Get the new insert position for the node we care about. 972 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 973 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 974 } 975 PointerType *New = new (*this,8) PointerType(T, Canonical); 976 Types.push_back(New); 977 PointerTypes.InsertNode(New, InsertPos); 978 return QualType(New, 0); 979} 980 981/// getBlockPointerType - Return the uniqued reference to the type for 982/// a pointer to the specified block. 983QualType ASTContext::getBlockPointerType(QualType T) { 984 assert(T->isFunctionType() && "block of function types only"); 985 // Unique pointers, to guarantee there is only one block of a particular 986 // structure. 987 llvm::FoldingSetNodeID ID; 988 BlockPointerType::Profile(ID, T); 989 990 void *InsertPos = 0; 991 if (BlockPointerType *PT = 992 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 993 return QualType(PT, 0); 994 995 // If the block pointee type isn't canonical, this won't be a canonical 996 // type either so fill in the canonical type field. 997 QualType Canonical; 998 if (!T->isCanonical()) { 999 Canonical = getBlockPointerType(getCanonicalType(T)); 1000 1001 // Get the new insert position for the node we care about. 1002 BlockPointerType *NewIP = 1003 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1004 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1005 } 1006 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 1007 Types.push_back(New); 1008 BlockPointerTypes.InsertNode(New, InsertPos); 1009 return QualType(New, 0); 1010} 1011 1012/// getLValueReferenceType - Return the uniqued reference to the type for an 1013/// lvalue reference to the specified type. 1014QualType ASTContext::getLValueReferenceType(QualType T) { 1015 // Unique pointers, to guarantee there is only one pointer of a particular 1016 // structure. 1017 llvm::FoldingSetNodeID ID; 1018 ReferenceType::Profile(ID, T); 1019 1020 void *InsertPos = 0; 1021 if (LValueReferenceType *RT = 1022 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1023 return QualType(RT, 0); 1024 1025 // If the referencee type isn't canonical, this won't be a canonical type 1026 // either, so fill in the canonical type field. 1027 QualType Canonical; 1028 if (!T->isCanonical()) { 1029 Canonical = getLValueReferenceType(getCanonicalType(T)); 1030 1031 // Get the new insert position for the node we care about. 1032 LValueReferenceType *NewIP = 1033 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1034 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1035 } 1036 1037 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 1038 Types.push_back(New); 1039 LValueReferenceTypes.InsertNode(New, InsertPos); 1040 return QualType(New, 0); 1041} 1042 1043/// getRValueReferenceType - Return the uniqued reference to the type for an 1044/// rvalue reference to the specified type. 1045QualType ASTContext::getRValueReferenceType(QualType T) { 1046 // Unique pointers, to guarantee there is only one pointer of a particular 1047 // structure. 1048 llvm::FoldingSetNodeID ID; 1049 ReferenceType::Profile(ID, T); 1050 1051 void *InsertPos = 0; 1052 if (RValueReferenceType *RT = 1053 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1054 return QualType(RT, 0); 1055 1056 // If the referencee type isn't canonical, this won't be a canonical type 1057 // either, so fill in the canonical type field. 1058 QualType Canonical; 1059 if (!T->isCanonical()) { 1060 Canonical = getRValueReferenceType(getCanonicalType(T)); 1061 1062 // Get the new insert position for the node we care about. 1063 RValueReferenceType *NewIP = 1064 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1065 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1066 } 1067 1068 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 1069 Types.push_back(New); 1070 RValueReferenceTypes.InsertNode(New, InsertPos); 1071 return QualType(New, 0); 1072} 1073 1074/// getMemberPointerType - Return the uniqued reference to the type for a 1075/// member pointer to the specified type, in the specified class. 1076QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1077{ 1078 // Unique pointers, to guarantee there is only one pointer of a particular 1079 // structure. 1080 llvm::FoldingSetNodeID ID; 1081 MemberPointerType::Profile(ID, T, Cls); 1082 1083 void *InsertPos = 0; 1084 if (MemberPointerType *PT = 1085 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1086 return QualType(PT, 0); 1087 1088 // If the pointee or class type isn't canonical, this won't be a canonical 1089 // type either, so fill in the canonical type field. 1090 QualType Canonical; 1091 if (!T->isCanonical()) { 1092 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1093 1094 // Get the new insert position for the node we care about. 1095 MemberPointerType *NewIP = 1096 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1097 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1098 } 1099 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1100 Types.push_back(New); 1101 MemberPointerTypes.InsertNode(New, InsertPos); 1102 return QualType(New, 0); 1103} 1104 1105/// getConstantArrayType - Return the unique reference to the type for an 1106/// array of the specified element type. 1107QualType ASTContext::getConstantArrayType(QualType EltTy, 1108 const llvm::APInt &ArySizeIn, 1109 ArrayType::ArraySizeModifier ASM, 1110 unsigned EltTypeQuals) { 1111 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1112 "Constant array of VLAs is illegal!"); 1113 1114 // Convert the array size into a canonical width matching the pointer size for 1115 // the target. 1116 llvm::APInt ArySize(ArySizeIn); 1117 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1118 1119 llvm::FoldingSetNodeID ID; 1120 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1121 1122 void *InsertPos = 0; 1123 if (ConstantArrayType *ATP = 1124 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1125 return QualType(ATP, 0); 1126 1127 // If the element type isn't canonical, this won't be a canonical type either, 1128 // so fill in the canonical type field. 1129 QualType Canonical; 1130 if (!EltTy->isCanonical()) { 1131 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1132 ASM, EltTypeQuals); 1133 // Get the new insert position for the node we care about. 1134 ConstantArrayType *NewIP = 1135 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1136 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1137 } 1138 1139 ConstantArrayType *New = 1140 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1141 ConstantArrayTypes.InsertNode(New, InsertPos); 1142 Types.push_back(New); 1143 return QualType(New, 0); 1144} 1145 1146/// getVariableArrayType - Returns a non-unique reference to the type for a 1147/// variable array of the specified element type. 1148QualType ASTContext::getVariableArrayType(QualType EltTy, Expr *NumElts, 1149 ArrayType::ArraySizeModifier ASM, 1150 unsigned EltTypeQuals) { 1151 // Since we don't unique expressions, it isn't possible to unique VLA's 1152 // that have an expression provided for their size. 1153 1154 VariableArrayType *New = 1155 new(*this,8)VariableArrayType(EltTy,QualType(), NumElts, ASM, EltTypeQuals); 1156 1157 VariableArrayTypes.push_back(New); 1158 Types.push_back(New); 1159 return QualType(New, 0); 1160} 1161 1162/// getDependentSizedArrayType - Returns a non-unique reference to 1163/// the type for a dependently-sized array of the specified element 1164/// type. FIXME: We will need these to be uniqued, or at least 1165/// comparable, at some point. 1166QualType ASTContext::getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 1167 ArrayType::ArraySizeModifier ASM, 1168 unsigned EltTypeQuals) { 1169 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1170 "Size must be type- or value-dependent!"); 1171 1172 // Since we don't unique expressions, it isn't possible to unique 1173 // dependently-sized array types. 1174 1175 DependentSizedArrayType *New = 1176 new (*this,8) DependentSizedArrayType(EltTy, QualType(), NumElts, 1177 ASM, EltTypeQuals); 1178 1179 DependentSizedArrayTypes.push_back(New); 1180 Types.push_back(New); 1181 return QualType(New, 0); 1182} 1183 1184QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1185 ArrayType::ArraySizeModifier ASM, 1186 unsigned EltTypeQuals) { 1187 llvm::FoldingSetNodeID ID; 1188 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1189 1190 void *InsertPos = 0; 1191 if (IncompleteArrayType *ATP = 1192 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1193 return QualType(ATP, 0); 1194 1195 // If the element type isn't canonical, this won't be a canonical type 1196 // either, so fill in the canonical type field. 1197 QualType Canonical; 1198 1199 if (!EltTy->isCanonical()) { 1200 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1201 ASM, EltTypeQuals); 1202 1203 // Get the new insert position for the node we care about. 1204 IncompleteArrayType *NewIP = 1205 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1206 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1207 } 1208 1209 IncompleteArrayType *New = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1210 ASM, EltTypeQuals); 1211 1212 IncompleteArrayTypes.InsertNode(New, InsertPos); 1213 Types.push_back(New); 1214 return QualType(New, 0); 1215} 1216 1217/// getVectorType - Return the unique reference to a vector type of 1218/// the specified element type and size. VectorType must be a built-in type. 1219QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1220 BuiltinType *baseType; 1221 1222 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1223 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1224 1225 // Check if we've already instantiated a vector of this type. 1226 llvm::FoldingSetNodeID ID; 1227 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1228 void *InsertPos = 0; 1229 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1230 return QualType(VTP, 0); 1231 1232 // If the element type isn't canonical, this won't be a canonical type either, 1233 // so fill in the canonical type field. 1234 QualType Canonical; 1235 if (!vecType->isCanonical()) { 1236 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1237 1238 // Get the new insert position for the node we care about. 1239 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1240 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1241 } 1242 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1243 VectorTypes.InsertNode(New, InsertPos); 1244 Types.push_back(New); 1245 return QualType(New, 0); 1246} 1247 1248/// getExtVectorType - Return the unique reference to an extended vector type of 1249/// the specified element type and size. VectorType must be a built-in type. 1250QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1251 BuiltinType *baseType; 1252 1253 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1254 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1255 1256 // Check if we've already instantiated a vector of this type. 1257 llvm::FoldingSetNodeID ID; 1258 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1259 void *InsertPos = 0; 1260 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1261 return QualType(VTP, 0); 1262 1263 // If the element type isn't canonical, this won't be a canonical type either, 1264 // so fill in the canonical type field. 1265 QualType Canonical; 1266 if (!vecType->isCanonical()) { 1267 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1268 1269 // Get the new insert position for the node we care about. 1270 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1271 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1272 } 1273 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1274 VectorTypes.InsertNode(New, InsertPos); 1275 Types.push_back(New); 1276 return QualType(New, 0); 1277} 1278 1279QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1280 Expr *SizeExpr, 1281 SourceLocation AttrLoc) { 1282 DependentSizedExtVectorType *New = 1283 new (*this,8) DependentSizedExtVectorType(vecType, QualType(), 1284 SizeExpr, AttrLoc); 1285 1286 DependentSizedExtVectorTypes.push_back(New); 1287 Types.push_back(New); 1288 return QualType(New, 0); 1289} 1290 1291/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1292/// 1293QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) { 1294 // Unique functions, to guarantee there is only one function of a particular 1295 // structure. 1296 llvm::FoldingSetNodeID ID; 1297 FunctionNoProtoType::Profile(ID, ResultTy); 1298 1299 void *InsertPos = 0; 1300 if (FunctionNoProtoType *FT = 1301 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1302 return QualType(FT, 0); 1303 1304 QualType Canonical; 1305 if (!ResultTy->isCanonical()) { 1306 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy)); 1307 1308 // Get the new insert position for the node we care about. 1309 FunctionNoProtoType *NewIP = 1310 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1311 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1312 } 1313 1314 FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical); 1315 Types.push_back(New); 1316 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1317 return QualType(New, 0); 1318} 1319 1320/// getFunctionType - Return a normal function type with a typed argument 1321/// list. isVariadic indicates whether the argument list includes '...'. 1322QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1323 unsigned NumArgs, bool isVariadic, 1324 unsigned TypeQuals, bool hasExceptionSpec, 1325 bool hasAnyExceptionSpec, unsigned NumExs, 1326 const QualType *ExArray) { 1327 // Unique functions, to guarantee there is only one function of a particular 1328 // structure. 1329 llvm::FoldingSetNodeID ID; 1330 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1331 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1332 NumExs, ExArray); 1333 1334 void *InsertPos = 0; 1335 if (FunctionProtoType *FTP = 1336 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1337 return QualType(FTP, 0); 1338 1339 // Determine whether the type being created is already canonical or not. 1340 bool isCanonical = ResultTy->isCanonical(); 1341 if (hasExceptionSpec) 1342 isCanonical = false; 1343 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1344 if (!ArgArray[i]->isCanonical()) 1345 isCanonical = false; 1346 1347 // If this type isn't canonical, get the canonical version of it. 1348 // The exception spec is not part of the canonical type. 1349 QualType Canonical; 1350 if (!isCanonical) { 1351 llvm::SmallVector<QualType, 16> CanonicalArgs; 1352 CanonicalArgs.reserve(NumArgs); 1353 for (unsigned i = 0; i != NumArgs; ++i) 1354 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1355 1356 Canonical = getFunctionType(getCanonicalType(ResultTy), 1357 CanonicalArgs.data(), NumArgs, 1358 isVariadic, TypeQuals); 1359 1360 // Get the new insert position for the node we care about. 1361 FunctionProtoType *NewIP = 1362 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1363 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1364 } 1365 1366 // FunctionProtoType objects are allocated with extra bytes after them 1367 // for two variable size arrays (for parameter and exception types) at the 1368 // end of them. 1369 FunctionProtoType *FTP = 1370 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1371 NumArgs*sizeof(QualType) + 1372 NumExs*sizeof(QualType), 8); 1373 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1374 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1375 ExArray, NumExs, Canonical); 1376 Types.push_back(FTP); 1377 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1378 return QualType(FTP, 0); 1379} 1380 1381/// getTypeDeclType - Return the unique reference to the type for the 1382/// specified type declaration. 1383QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1384 assert(Decl && "Passed null for Decl param"); 1385 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1386 1387 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1388 return getTypedefType(Typedef); 1389 else if (isa<TemplateTypeParmDecl>(Decl)) { 1390 assert(false && "Template type parameter types are always available."); 1391 } else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1392 return getObjCInterfaceType(ObjCInterface); 1393 1394 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1395 if (PrevDecl) 1396 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1397 else 1398 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1399 } 1400 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1401 if (PrevDecl) 1402 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1403 else 1404 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1405 } 1406 else 1407 assert(false && "TypeDecl without a type?"); 1408 1409 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1410 return QualType(Decl->TypeForDecl, 0); 1411} 1412 1413/// getTypedefType - Return the unique reference to the type for the 1414/// specified typename decl. 1415QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1416 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1417 1418 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1419 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1420 Types.push_back(Decl->TypeForDecl); 1421 return QualType(Decl->TypeForDecl, 0); 1422} 1423 1424/// getObjCInterfaceType - Return the unique reference to the type for the 1425/// specified ObjC interface decl. 1426QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) { 1427 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1428 1429 ObjCInterfaceDecl *OID = const_cast<ObjCInterfaceDecl*>(Decl); 1430 Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, OID); 1431 Types.push_back(Decl->TypeForDecl); 1432 return QualType(Decl->TypeForDecl, 0); 1433} 1434 1435/// \brief Retrieve the template type parameter type for a template 1436/// parameter or parameter pack with the given depth, index, and (optionally) 1437/// name. 1438QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1439 bool ParameterPack, 1440 IdentifierInfo *Name) { 1441 llvm::FoldingSetNodeID ID; 1442 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1443 void *InsertPos = 0; 1444 TemplateTypeParmType *TypeParm 1445 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1446 1447 if (TypeParm) 1448 return QualType(TypeParm, 0); 1449 1450 if (Name) { 1451 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1452 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack, 1453 Name, Canon); 1454 } else 1455 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack); 1456 1457 Types.push_back(TypeParm); 1458 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1459 1460 return QualType(TypeParm, 0); 1461} 1462 1463QualType 1464ASTContext::getTemplateSpecializationType(TemplateName Template, 1465 const TemplateArgument *Args, 1466 unsigned NumArgs, 1467 QualType Canon) { 1468 if (!Canon.isNull()) 1469 Canon = getCanonicalType(Canon); 1470 1471 llvm::FoldingSetNodeID ID; 1472 TemplateSpecializationType::Profile(ID, Template, Args, NumArgs); 1473 1474 void *InsertPos = 0; 1475 TemplateSpecializationType *Spec 1476 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1477 1478 if (Spec) 1479 return QualType(Spec, 0); 1480 1481 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1482 sizeof(TemplateArgument) * NumArgs), 1483 8); 1484 Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon); 1485 Types.push_back(Spec); 1486 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1487 1488 return QualType(Spec, 0); 1489} 1490 1491QualType 1492ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1493 QualType NamedType) { 1494 llvm::FoldingSetNodeID ID; 1495 QualifiedNameType::Profile(ID, NNS, NamedType); 1496 1497 void *InsertPos = 0; 1498 QualifiedNameType *T 1499 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1500 if (T) 1501 return QualType(T, 0); 1502 1503 T = new (*this) QualifiedNameType(NNS, NamedType, 1504 getCanonicalType(NamedType)); 1505 Types.push_back(T); 1506 QualifiedNameTypes.InsertNode(T, InsertPos); 1507 return QualType(T, 0); 1508} 1509 1510QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1511 const IdentifierInfo *Name, 1512 QualType Canon) { 1513 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1514 1515 if (Canon.isNull()) { 1516 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1517 if (CanonNNS != NNS) 1518 Canon = getTypenameType(CanonNNS, Name); 1519 } 1520 1521 llvm::FoldingSetNodeID ID; 1522 TypenameType::Profile(ID, NNS, Name); 1523 1524 void *InsertPos = 0; 1525 TypenameType *T 1526 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1527 if (T) 1528 return QualType(T, 0); 1529 1530 T = new (*this) TypenameType(NNS, Name, Canon); 1531 Types.push_back(T); 1532 TypenameTypes.InsertNode(T, InsertPos); 1533 return QualType(T, 0); 1534} 1535 1536QualType 1537ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1538 const TemplateSpecializationType *TemplateId, 1539 QualType Canon) { 1540 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1541 1542 if (Canon.isNull()) { 1543 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1544 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1545 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1546 const TemplateSpecializationType *CanonTemplateId 1547 = CanonType->getAsTemplateSpecializationType(); 1548 assert(CanonTemplateId && 1549 "Canonical type must also be a template specialization type"); 1550 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1551 } 1552 } 1553 1554 llvm::FoldingSetNodeID ID; 1555 TypenameType::Profile(ID, NNS, TemplateId); 1556 1557 void *InsertPos = 0; 1558 TypenameType *T 1559 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1560 if (T) 1561 return QualType(T, 0); 1562 1563 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1564 Types.push_back(T); 1565 TypenameTypes.InsertNode(T, InsertPos); 1566 return QualType(T, 0); 1567} 1568 1569/// CmpProtocolNames - Comparison predicate for sorting protocols 1570/// alphabetically. 1571static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1572 const ObjCProtocolDecl *RHS) { 1573 return LHS->getDeclName() < RHS->getDeclName(); 1574} 1575 1576static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1577 unsigned &NumProtocols) { 1578 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1579 1580 // Sort protocols, keyed by name. 1581 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1582 1583 // Remove duplicates. 1584 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1585 NumProtocols = ProtocolsEnd-Protocols; 1586} 1587 1588/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1589/// the given interface decl and the conforming protocol list. 1590QualType ASTContext::getObjCObjectPointerType(ObjCInterfaceDecl *Decl, 1591 ObjCProtocolDecl **Protocols, 1592 unsigned NumProtocols) { 1593 // Sort the protocol list alphabetically to canonicalize it. 1594 if (NumProtocols) 1595 SortAndUniqueProtocols(Protocols, NumProtocols); 1596 1597 llvm::FoldingSetNodeID ID; 1598 ObjCObjectPointerType::Profile(ID, Decl, Protocols, NumProtocols); 1599 1600 void *InsertPos = 0; 1601 if (ObjCObjectPointerType *QT = 1602 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1603 return QualType(QT, 0); 1604 1605 // No Match; 1606 ObjCObjectPointerType *QType = 1607 new (*this,8) ObjCObjectPointerType(Decl, Protocols, NumProtocols); 1608 1609 Types.push_back(QType); 1610 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1611 return QualType(QType, 0); 1612} 1613 1614/// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for 1615/// the given interface decl and the conforming protocol list. 1616QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 1617 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1618 // Sort the protocol list alphabetically to canonicalize it. 1619 SortAndUniqueProtocols(Protocols, NumProtocols); 1620 1621 llvm::FoldingSetNodeID ID; 1622 ObjCQualifiedInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1623 1624 void *InsertPos = 0; 1625 if (ObjCQualifiedInterfaceType *QT = 1626 ObjCQualifiedInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1627 return QualType(QT, 0); 1628 1629 // No Match; 1630 ObjCQualifiedInterfaceType *QType = 1631 new (*this,8) ObjCQualifiedInterfaceType(Decl, Protocols, NumProtocols); 1632 1633 Types.push_back(QType); 1634 ObjCQualifiedInterfaceTypes.InsertNode(QType, InsertPos); 1635 return QualType(QType, 0); 1636} 1637 1638/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1639/// TypeOfExprType AST's (since expression's are never shared). For example, 1640/// multiple declarations that refer to "typeof(x)" all contain different 1641/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1642/// on canonical type's (which are always unique). 1643QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1644 QualType Canonical = getCanonicalType(tofExpr->getType()); 1645 TypeOfExprType *toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1646 Types.push_back(toe); 1647 return QualType(toe, 0); 1648} 1649 1650/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1651/// TypeOfType AST's. The only motivation to unique these nodes would be 1652/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1653/// an issue. This doesn't effect the type checker, since it operates 1654/// on canonical type's (which are always unique). 1655QualType ASTContext::getTypeOfType(QualType tofType) { 1656 QualType Canonical = getCanonicalType(tofType); 1657 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1658 Types.push_back(tot); 1659 return QualType(tot, 0); 1660} 1661 1662/// getDecltypeForExpr - Given an expr, will return the decltype for that 1663/// expression, according to the rules in C++0x [dcl.type.simple]p4 1664static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 1665 if (e->isTypeDependent()) 1666 return Context.DependentTy; 1667 1668 // If e is an id expression or a class member access, decltype(e) is defined 1669 // as the type of the entity named by e. 1670 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 1671 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 1672 return VD->getType(); 1673 } 1674 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 1675 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1676 return FD->getType(); 1677 } 1678 // If e is a function call or an invocation of an overloaded operator, 1679 // (parentheses around e are ignored), decltype(e) is defined as the 1680 // return type of that function. 1681 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 1682 return CE->getCallReturnType(); 1683 1684 QualType T = e->getType(); 1685 1686 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 1687 // defined as T&, otherwise decltype(e) is defined as T. 1688 if (e->isLvalue(Context) == Expr::LV_Valid) 1689 T = Context.getLValueReferenceType(T); 1690 1691 return T; 1692} 1693 1694/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 1695/// DecltypeType AST's. The only motivation to unique these nodes would be 1696/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 1697/// an issue. This doesn't effect the type checker, since it operates 1698/// on canonical type's (which are always unique). 1699QualType ASTContext::getDecltypeType(Expr *e) { 1700 QualType T = getDecltypeForExpr(e, *this); 1701 DecltypeType *dt = new (*this, 8) DecltypeType(e, getCanonicalType(T)); 1702 Types.push_back(dt); 1703 return QualType(dt, 0); 1704} 1705 1706/// getTagDeclType - Return the unique reference to the type for the 1707/// specified TagDecl (struct/union/class/enum) decl. 1708QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1709 assert (Decl); 1710 return getTypeDeclType(Decl); 1711} 1712 1713/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1714/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1715/// needs to agree with the definition in <stddef.h>. 1716QualType ASTContext::getSizeType() const { 1717 return getFromTargetType(Target.getSizeType()); 1718} 1719 1720/// getSignedWCharType - Return the type of "signed wchar_t". 1721/// Used when in C++, as a GCC extension. 1722QualType ASTContext::getSignedWCharType() const { 1723 // FIXME: derive from "Target" ? 1724 return WCharTy; 1725} 1726 1727/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1728/// Used when in C++, as a GCC extension. 1729QualType ASTContext::getUnsignedWCharType() const { 1730 // FIXME: derive from "Target" ? 1731 return UnsignedIntTy; 1732} 1733 1734/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 1735/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 1736QualType ASTContext::getPointerDiffType() const { 1737 return getFromTargetType(Target.getPtrDiffType(0)); 1738} 1739 1740//===----------------------------------------------------------------------===// 1741// Type Operators 1742//===----------------------------------------------------------------------===// 1743 1744/// getCanonicalType - Return the canonical (structural) type corresponding to 1745/// the specified potentially non-canonical type. The non-canonical version 1746/// of a type may have many "decorated" versions of types. Decorators can 1747/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 1748/// to be free of any of these, allowing two canonical types to be compared 1749/// for exact equality with a simple pointer comparison. 1750QualType ASTContext::getCanonicalType(QualType T) { 1751 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 1752 1753 // If the result has type qualifiers, make sure to canonicalize them as well. 1754 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 1755 if (TypeQuals == 0) return CanType; 1756 1757 // If the type qualifiers are on an array type, get the canonical type of the 1758 // array with the qualifiers applied to the element type. 1759 ArrayType *AT = dyn_cast<ArrayType>(CanType); 1760 if (!AT) 1761 return CanType.getQualifiedType(TypeQuals); 1762 1763 // Get the canonical version of the element with the extra qualifiers on it. 1764 // This can recursively sink qualifiers through multiple levels of arrays. 1765 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 1766 NewEltTy = getCanonicalType(NewEltTy); 1767 1768 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1769 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 1770 CAT->getIndexTypeQualifier()); 1771 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 1772 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 1773 IAT->getIndexTypeQualifier()); 1774 1775 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 1776 return getDependentSizedArrayType(NewEltTy, DSAT->getSizeExpr(), 1777 DSAT->getSizeModifier(), 1778 DSAT->getIndexTypeQualifier()); 1779 1780 VariableArrayType *VAT = cast<VariableArrayType>(AT); 1781 return getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1782 VAT->getSizeModifier(), 1783 VAT->getIndexTypeQualifier()); 1784} 1785 1786Decl *ASTContext::getCanonicalDecl(Decl *D) { 1787 if (!D) 1788 return 0; 1789 1790 if (TagDecl *Tag = dyn_cast<TagDecl>(D)) { 1791 QualType T = getTagDeclType(Tag); 1792 return cast<TagDecl>(cast<TagType>(T.getTypePtr()->CanonicalType) 1793 ->getDecl()); 1794 } 1795 1796 if (ClassTemplateDecl *Template = dyn_cast<ClassTemplateDecl>(D)) { 1797 while (Template->getPreviousDeclaration()) 1798 Template = Template->getPreviousDeclaration(); 1799 return Template; 1800 } 1801 1802 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 1803 while (Function->getPreviousDeclaration()) 1804 Function = Function->getPreviousDeclaration(); 1805 return const_cast<FunctionDecl *>(Function); 1806 } 1807 1808 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) { 1809 while (FunTmpl->getPreviousDeclaration()) 1810 FunTmpl = FunTmpl->getPreviousDeclaration(); 1811 return FunTmpl; 1812 } 1813 1814 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 1815 while (Var->getPreviousDeclaration()) 1816 Var = Var->getPreviousDeclaration(); 1817 return const_cast<VarDecl *>(Var); 1818 } 1819 1820 return D; 1821} 1822 1823TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 1824 // If this template name refers to a template, the canonical 1825 // template name merely stores the template itself. 1826 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 1827 return TemplateName(cast<TemplateDecl>(getCanonicalDecl(Template))); 1828 1829 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 1830 assert(DTN && "Non-dependent template names must refer to template decls."); 1831 return DTN->CanonicalTemplateName; 1832} 1833 1834NestedNameSpecifier * 1835ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 1836 if (!NNS) 1837 return 0; 1838 1839 switch (NNS->getKind()) { 1840 case NestedNameSpecifier::Identifier: 1841 // Canonicalize the prefix but keep the identifier the same. 1842 return NestedNameSpecifier::Create(*this, 1843 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 1844 NNS->getAsIdentifier()); 1845 1846 case NestedNameSpecifier::Namespace: 1847 // A namespace is canonical; build a nested-name-specifier with 1848 // this namespace and no prefix. 1849 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 1850 1851 case NestedNameSpecifier::TypeSpec: 1852 case NestedNameSpecifier::TypeSpecWithTemplate: { 1853 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 1854 NestedNameSpecifier *Prefix = 0; 1855 1856 // FIXME: This isn't the right check! 1857 if (T->isDependentType()) 1858 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 1859 1860 return NestedNameSpecifier::Create(*this, Prefix, 1861 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 1862 T.getTypePtr()); 1863 } 1864 1865 case NestedNameSpecifier::Global: 1866 // The global specifier is canonical and unique. 1867 return NNS; 1868 } 1869 1870 // Required to silence a GCC warning 1871 return 0; 1872} 1873 1874 1875const ArrayType *ASTContext::getAsArrayType(QualType T) { 1876 // Handle the non-qualified case efficiently. 1877 if (T.getCVRQualifiers() == 0) { 1878 // Handle the common positive case fast. 1879 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 1880 return AT; 1881 } 1882 1883 // Handle the common negative case fast, ignoring CVR qualifiers. 1884 QualType CType = T->getCanonicalTypeInternal(); 1885 1886 // Make sure to look through type qualifiers (like ExtQuals) for the negative 1887 // test. 1888 if (!isa<ArrayType>(CType) && 1889 !isa<ArrayType>(CType.getUnqualifiedType())) 1890 return 0; 1891 1892 // Apply any CVR qualifiers from the array type to the element type. This 1893 // implements C99 6.7.3p8: "If the specification of an array type includes 1894 // any type qualifiers, the element type is so qualified, not the array type." 1895 1896 // If we get here, we either have type qualifiers on the type, or we have 1897 // sugar such as a typedef in the way. If we have type qualifiers on the type 1898 // we must propagate them down into the elemeng type. 1899 unsigned CVRQuals = T.getCVRQualifiers(); 1900 unsigned AddrSpace = 0; 1901 Type *Ty = T.getTypePtr(); 1902 1903 // Rip through ExtQualType's and typedefs to get to a concrete type. 1904 while (1) { 1905 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 1906 AddrSpace = EXTQT->getAddressSpace(); 1907 Ty = EXTQT->getBaseType(); 1908 } else { 1909 T = Ty->getDesugaredType(); 1910 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 1911 break; 1912 CVRQuals |= T.getCVRQualifiers(); 1913 Ty = T.getTypePtr(); 1914 } 1915 } 1916 1917 // If we have a simple case, just return now. 1918 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 1919 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 1920 return ATy; 1921 1922 // Otherwise, we have an array and we have qualifiers on it. Push the 1923 // qualifiers into the array element type and return a new array type. 1924 // Get the canonical version of the element with the extra qualifiers on it. 1925 // This can recursively sink qualifiers through multiple levels of arrays. 1926 QualType NewEltTy = ATy->getElementType(); 1927 if (AddrSpace) 1928 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 1929 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 1930 1931 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 1932 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 1933 CAT->getSizeModifier(), 1934 CAT->getIndexTypeQualifier())); 1935 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 1936 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 1937 IAT->getSizeModifier(), 1938 IAT->getIndexTypeQualifier())); 1939 1940 if (const DependentSizedArrayType *DSAT 1941 = dyn_cast<DependentSizedArrayType>(ATy)) 1942 return cast<ArrayType>( 1943 getDependentSizedArrayType(NewEltTy, 1944 DSAT->getSizeExpr(), 1945 DSAT->getSizeModifier(), 1946 DSAT->getIndexTypeQualifier())); 1947 1948 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 1949 return cast<ArrayType>(getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1950 VAT->getSizeModifier(), 1951 VAT->getIndexTypeQualifier())); 1952} 1953 1954 1955/// getArrayDecayedType - Return the properly qualified result of decaying the 1956/// specified array type to a pointer. This operation is non-trivial when 1957/// handling typedefs etc. The canonical type of "T" must be an array type, 1958/// this returns a pointer to a properly qualified element of the array. 1959/// 1960/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 1961QualType ASTContext::getArrayDecayedType(QualType Ty) { 1962 // Get the element type with 'getAsArrayType' so that we don't lose any 1963 // typedefs in the element type of the array. This also handles propagation 1964 // of type qualifiers from the array type into the element type if present 1965 // (C99 6.7.3p8). 1966 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 1967 assert(PrettyArrayType && "Not an array type!"); 1968 1969 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 1970 1971 // int x[restrict 4] -> int *restrict 1972 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 1973} 1974 1975QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 1976 QualType ElemTy = VAT->getElementType(); 1977 1978 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 1979 return getBaseElementType(VAT); 1980 1981 return ElemTy; 1982} 1983 1984/// getFloatingRank - Return a relative rank for floating point types. 1985/// This routine will assert if passed a built-in type that isn't a float. 1986static FloatingRank getFloatingRank(QualType T) { 1987 if (const ComplexType *CT = T->getAsComplexType()) 1988 return getFloatingRank(CT->getElementType()); 1989 1990 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 1991 switch (T->getAsBuiltinType()->getKind()) { 1992 default: assert(0 && "getFloatingRank(): not a floating type"); 1993 case BuiltinType::Float: return FloatRank; 1994 case BuiltinType::Double: return DoubleRank; 1995 case BuiltinType::LongDouble: return LongDoubleRank; 1996 } 1997} 1998 1999/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2000/// point or a complex type (based on typeDomain/typeSize). 2001/// 'typeDomain' is a real floating point or complex type. 2002/// 'typeSize' is a real floating point or complex type. 2003QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2004 QualType Domain) const { 2005 FloatingRank EltRank = getFloatingRank(Size); 2006 if (Domain->isComplexType()) { 2007 switch (EltRank) { 2008 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2009 case FloatRank: return FloatComplexTy; 2010 case DoubleRank: return DoubleComplexTy; 2011 case LongDoubleRank: return LongDoubleComplexTy; 2012 } 2013 } 2014 2015 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2016 switch (EltRank) { 2017 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2018 case FloatRank: return FloatTy; 2019 case DoubleRank: return DoubleTy; 2020 case LongDoubleRank: return LongDoubleTy; 2021 } 2022} 2023 2024/// getFloatingTypeOrder - Compare the rank of the two specified floating 2025/// point types, ignoring the domain of the type (i.e. 'double' == 2026/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2027/// LHS < RHS, return -1. 2028int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2029 FloatingRank LHSR = getFloatingRank(LHS); 2030 FloatingRank RHSR = getFloatingRank(RHS); 2031 2032 if (LHSR == RHSR) 2033 return 0; 2034 if (LHSR > RHSR) 2035 return 1; 2036 return -1; 2037} 2038 2039/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2040/// routine will assert if passed a built-in type that isn't an integer or enum, 2041/// or if it is not canonicalized. 2042unsigned ASTContext::getIntegerRank(Type *T) { 2043 assert(T->isCanonical() && "T should be canonicalized"); 2044 if (EnumType* ET = dyn_cast<EnumType>(T)) 2045 T = ET->getDecl()->getIntegerType().getTypePtr(); 2046 2047 // There are two things which impact the integer rank: the width, and 2048 // the ordering of builtins. The builtin ordering is encoded in the 2049 // bottom three bits; the width is encoded in the bits above that. 2050 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2051 return FWIT->getWidth() << 3; 2052 2053 switch (cast<BuiltinType>(T)->getKind()) { 2054 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2055 case BuiltinType::Bool: 2056 return 1 + (getIntWidth(BoolTy) << 3); 2057 case BuiltinType::Char_S: 2058 case BuiltinType::Char_U: 2059 case BuiltinType::SChar: 2060 case BuiltinType::UChar: 2061 return 2 + (getIntWidth(CharTy) << 3); 2062 case BuiltinType::Short: 2063 case BuiltinType::UShort: 2064 return 3 + (getIntWidth(ShortTy) << 3); 2065 case BuiltinType::Int: 2066 case BuiltinType::UInt: 2067 return 4 + (getIntWidth(IntTy) << 3); 2068 case BuiltinType::Long: 2069 case BuiltinType::ULong: 2070 return 5 + (getIntWidth(LongTy) << 3); 2071 case BuiltinType::LongLong: 2072 case BuiltinType::ULongLong: 2073 return 6 + (getIntWidth(LongLongTy) << 3); 2074 case BuiltinType::Int128: 2075 case BuiltinType::UInt128: 2076 return 7 + (getIntWidth(Int128Ty) << 3); 2077 } 2078} 2079 2080/// getIntegerTypeOrder - Returns the highest ranked integer type: 2081/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2082/// LHS < RHS, return -1. 2083int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2084 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2085 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2086 if (LHSC == RHSC) return 0; 2087 2088 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2089 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2090 2091 unsigned LHSRank = getIntegerRank(LHSC); 2092 unsigned RHSRank = getIntegerRank(RHSC); 2093 2094 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2095 if (LHSRank == RHSRank) return 0; 2096 return LHSRank > RHSRank ? 1 : -1; 2097 } 2098 2099 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2100 if (LHSUnsigned) { 2101 // If the unsigned [LHS] type is larger, return it. 2102 if (LHSRank >= RHSRank) 2103 return 1; 2104 2105 // If the signed type can represent all values of the unsigned type, it 2106 // wins. Because we are dealing with 2's complement and types that are 2107 // powers of two larger than each other, this is always safe. 2108 return -1; 2109 } 2110 2111 // If the unsigned [RHS] type is larger, return it. 2112 if (RHSRank >= LHSRank) 2113 return -1; 2114 2115 // If the signed type can represent all values of the unsigned type, it 2116 // wins. Because we are dealing with 2's complement and types that are 2117 // powers of two larger than each other, this is always safe. 2118 return 1; 2119} 2120 2121// getCFConstantStringType - Return the type used for constant CFStrings. 2122QualType ASTContext::getCFConstantStringType() { 2123 if (!CFConstantStringTypeDecl) { 2124 CFConstantStringTypeDecl = 2125 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2126 &Idents.get("NSConstantString")); 2127 QualType FieldTypes[4]; 2128 2129 // const int *isa; 2130 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2131 // int flags; 2132 FieldTypes[1] = IntTy; 2133 // const char *str; 2134 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2135 // long length; 2136 FieldTypes[3] = LongTy; 2137 2138 // Create fields 2139 for (unsigned i = 0; i < 4; ++i) { 2140 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2141 SourceLocation(), 0, 2142 FieldTypes[i], /*BitWidth=*/0, 2143 /*Mutable=*/false); 2144 CFConstantStringTypeDecl->addDecl(*this, Field); 2145 } 2146 2147 CFConstantStringTypeDecl->completeDefinition(*this); 2148 } 2149 2150 return getTagDeclType(CFConstantStringTypeDecl); 2151} 2152 2153void ASTContext::setCFConstantStringType(QualType T) { 2154 const RecordType *Rec = T->getAsRecordType(); 2155 assert(Rec && "Invalid CFConstantStringType"); 2156 CFConstantStringTypeDecl = Rec->getDecl(); 2157} 2158 2159QualType ASTContext::getObjCFastEnumerationStateType() 2160{ 2161 if (!ObjCFastEnumerationStateTypeDecl) { 2162 ObjCFastEnumerationStateTypeDecl = 2163 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2164 &Idents.get("__objcFastEnumerationState")); 2165 2166 QualType FieldTypes[] = { 2167 UnsignedLongTy, 2168 getPointerType(ObjCIdType), 2169 getPointerType(UnsignedLongTy), 2170 getConstantArrayType(UnsignedLongTy, 2171 llvm::APInt(32, 5), ArrayType::Normal, 0) 2172 }; 2173 2174 for (size_t i = 0; i < 4; ++i) { 2175 FieldDecl *Field = FieldDecl::Create(*this, 2176 ObjCFastEnumerationStateTypeDecl, 2177 SourceLocation(), 0, 2178 FieldTypes[i], /*BitWidth=*/0, 2179 /*Mutable=*/false); 2180 ObjCFastEnumerationStateTypeDecl->addDecl(*this, Field); 2181 } 2182 2183 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2184 } 2185 2186 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2187} 2188 2189void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2190 const RecordType *Rec = T->getAsRecordType(); 2191 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2192 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2193} 2194 2195// This returns true if a type has been typedefed to BOOL: 2196// typedef <type> BOOL; 2197static bool isTypeTypedefedAsBOOL(QualType T) { 2198 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2199 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2200 return II->isStr("BOOL"); 2201 2202 return false; 2203} 2204 2205/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2206/// purpose. 2207int ASTContext::getObjCEncodingTypeSize(QualType type) { 2208 uint64_t sz = getTypeSize(type); 2209 2210 // Make all integer and enum types at least as large as an int 2211 if (sz > 0 && type->isIntegralType()) 2212 sz = std::max(sz, getTypeSize(IntTy)); 2213 // Treat arrays as pointers, since that's how they're passed in. 2214 else if (type->isArrayType()) 2215 sz = getTypeSize(VoidPtrTy); 2216 return sz / getTypeSize(CharTy); 2217} 2218 2219/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2220/// declaration. 2221void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2222 std::string& S) { 2223 // FIXME: This is not very efficient. 2224 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2225 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2226 // Encode result type. 2227 getObjCEncodingForType(Decl->getResultType(), S); 2228 // Compute size of all parameters. 2229 // Start with computing size of a pointer in number of bytes. 2230 // FIXME: There might(should) be a better way of doing this computation! 2231 SourceLocation Loc; 2232 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2233 // The first two arguments (self and _cmd) are pointers; account for 2234 // their size. 2235 int ParmOffset = 2 * PtrSize; 2236 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2237 E = Decl->param_end(); PI != E; ++PI) { 2238 QualType PType = (*PI)->getType(); 2239 int sz = getObjCEncodingTypeSize(PType); 2240 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2241 ParmOffset += sz; 2242 } 2243 S += llvm::utostr(ParmOffset); 2244 S += "@0:"; 2245 S += llvm::utostr(PtrSize); 2246 2247 // Argument types. 2248 ParmOffset = 2 * PtrSize; 2249 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2250 E = Decl->param_end(); PI != E; ++PI) { 2251 ParmVarDecl *PVDecl = *PI; 2252 QualType PType = PVDecl->getOriginalType(); 2253 if (const ArrayType *AT = 2254 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2255 // Use array's original type only if it has known number of 2256 // elements. 2257 if (!isa<ConstantArrayType>(AT)) 2258 PType = PVDecl->getType(); 2259 } else if (PType->isFunctionType()) 2260 PType = PVDecl->getType(); 2261 // Process argument qualifiers for user supplied arguments; such as, 2262 // 'in', 'inout', etc. 2263 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2264 getObjCEncodingForType(PType, S); 2265 S += llvm::utostr(ParmOffset); 2266 ParmOffset += getObjCEncodingTypeSize(PType); 2267 } 2268} 2269 2270/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2271/// property declaration. If non-NULL, Container must be either an 2272/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2273/// NULL when getting encodings for protocol properties. 2274/// Property attributes are stored as a comma-delimited C string. The simple 2275/// attributes readonly and bycopy are encoded as single characters. The 2276/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2277/// encoded as single characters, followed by an identifier. Property types 2278/// are also encoded as a parametrized attribute. The characters used to encode 2279/// these attributes are defined by the following enumeration: 2280/// @code 2281/// enum PropertyAttributes { 2282/// kPropertyReadOnly = 'R', // property is read-only. 2283/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2284/// kPropertyByref = '&', // property is a reference to the value last assigned 2285/// kPropertyDynamic = 'D', // property is dynamic 2286/// kPropertyGetter = 'G', // followed by getter selector name 2287/// kPropertySetter = 'S', // followed by setter selector name 2288/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2289/// kPropertyType = 't' // followed by old-style type encoding. 2290/// kPropertyWeak = 'W' // 'weak' property 2291/// kPropertyStrong = 'P' // property GC'able 2292/// kPropertyNonAtomic = 'N' // property non-atomic 2293/// }; 2294/// @endcode 2295void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2296 const Decl *Container, 2297 std::string& S) { 2298 // Collect information from the property implementation decl(s). 2299 bool Dynamic = false; 2300 ObjCPropertyImplDecl *SynthesizePID = 0; 2301 2302 // FIXME: Duplicated code due to poor abstraction. 2303 if (Container) { 2304 if (const ObjCCategoryImplDecl *CID = 2305 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2306 for (ObjCCategoryImplDecl::propimpl_iterator 2307 i = CID->propimpl_begin(*this), e = CID->propimpl_end(*this); 2308 i != e; ++i) { 2309 ObjCPropertyImplDecl *PID = *i; 2310 if (PID->getPropertyDecl() == PD) { 2311 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2312 Dynamic = true; 2313 } else { 2314 SynthesizePID = PID; 2315 } 2316 } 2317 } 2318 } else { 2319 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2320 for (ObjCCategoryImplDecl::propimpl_iterator 2321 i = OID->propimpl_begin(*this), e = OID->propimpl_end(*this); 2322 i != e; ++i) { 2323 ObjCPropertyImplDecl *PID = *i; 2324 if (PID->getPropertyDecl() == PD) { 2325 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2326 Dynamic = true; 2327 } else { 2328 SynthesizePID = PID; 2329 } 2330 } 2331 } 2332 } 2333 } 2334 2335 // FIXME: This is not very efficient. 2336 S = "T"; 2337 2338 // Encode result type. 2339 // GCC has some special rules regarding encoding of properties which 2340 // closely resembles encoding of ivars. 2341 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2342 true /* outermost type */, 2343 true /* encoding for property */); 2344 2345 if (PD->isReadOnly()) { 2346 S += ",R"; 2347 } else { 2348 switch (PD->getSetterKind()) { 2349 case ObjCPropertyDecl::Assign: break; 2350 case ObjCPropertyDecl::Copy: S += ",C"; break; 2351 case ObjCPropertyDecl::Retain: S += ",&"; break; 2352 } 2353 } 2354 2355 // It really isn't clear at all what this means, since properties 2356 // are "dynamic by default". 2357 if (Dynamic) 2358 S += ",D"; 2359 2360 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2361 S += ",N"; 2362 2363 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2364 S += ",G"; 2365 S += PD->getGetterName().getAsString(); 2366 } 2367 2368 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2369 S += ",S"; 2370 S += PD->getSetterName().getAsString(); 2371 } 2372 2373 if (SynthesizePID) { 2374 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2375 S += ",V"; 2376 S += OID->getNameAsString(); 2377 } 2378 2379 // FIXME: OBJCGC: weak & strong 2380} 2381 2382/// getLegacyIntegralTypeEncoding - 2383/// Another legacy compatibility encoding: 32-bit longs are encoded as 2384/// 'l' or 'L' , but not always. For typedefs, we need to use 2385/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2386/// 2387void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2388 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 2389 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2390 if (BT->getKind() == BuiltinType::ULong && 2391 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2392 PointeeTy = UnsignedIntTy; 2393 else 2394 if (BT->getKind() == BuiltinType::Long && 2395 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2396 PointeeTy = IntTy; 2397 } 2398 } 2399} 2400 2401void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2402 const FieldDecl *Field) { 2403 // We follow the behavior of gcc, expanding structures which are 2404 // directly pointed to, and expanding embedded structures. Note that 2405 // these rules are sufficient to prevent recursive encoding of the 2406 // same type. 2407 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2408 true /* outermost type */); 2409} 2410 2411static void EncodeBitField(const ASTContext *Context, std::string& S, 2412 const FieldDecl *FD) { 2413 const Expr *E = FD->getBitWidth(); 2414 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2415 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2416 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2417 S += 'b'; 2418 S += llvm::utostr(N); 2419} 2420 2421void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2422 bool ExpandPointedToStructures, 2423 bool ExpandStructures, 2424 const FieldDecl *FD, 2425 bool OutermostType, 2426 bool EncodingProperty) { 2427 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2428 if (FD && FD->isBitField()) { 2429 EncodeBitField(this, S, FD); 2430 } 2431 else { 2432 char encoding; 2433 switch (BT->getKind()) { 2434 default: assert(0 && "Unhandled builtin type kind"); 2435 case BuiltinType::Void: encoding = 'v'; break; 2436 case BuiltinType::Bool: encoding = 'B'; break; 2437 case BuiltinType::Char_U: 2438 case BuiltinType::UChar: encoding = 'C'; break; 2439 case BuiltinType::UShort: encoding = 'S'; break; 2440 case BuiltinType::UInt: encoding = 'I'; break; 2441 case BuiltinType::ULong: 2442 encoding = 2443 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2444 break; 2445 case BuiltinType::UInt128: encoding = 'T'; break; 2446 case BuiltinType::ULongLong: encoding = 'Q'; break; 2447 case BuiltinType::Char_S: 2448 case BuiltinType::SChar: encoding = 'c'; break; 2449 case BuiltinType::Short: encoding = 's'; break; 2450 case BuiltinType::Int: encoding = 'i'; break; 2451 case BuiltinType::Long: 2452 encoding = 2453 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2454 break; 2455 case BuiltinType::LongLong: encoding = 'q'; break; 2456 case BuiltinType::Int128: encoding = 't'; break; 2457 case BuiltinType::Float: encoding = 'f'; break; 2458 case BuiltinType::Double: encoding = 'd'; break; 2459 case BuiltinType::LongDouble: encoding = 'd'; break; 2460 } 2461 2462 S += encoding; 2463 } 2464 } else if (const ComplexType *CT = T->getAsComplexType()) { 2465 S += 'j'; 2466 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2467 false); 2468 } else if (T->isObjCQualifiedIdType()) { 2469 getObjCEncodingForTypeImpl(getObjCIdType(), S, 2470 ExpandPointedToStructures, 2471 ExpandStructures, FD); 2472 if (FD || EncodingProperty) { 2473 // Note that we do extended encoding of protocol qualifer list 2474 // Only when doing ivar or property encoding. 2475 const ObjCObjectPointerType *QIDT = T->getAsObjCQualifiedIdType(); 2476 S += '"'; 2477 for (ObjCObjectPointerType::qual_iterator I = QIDT->qual_begin(), 2478 E = QIDT->qual_end(); I != E; ++I) { 2479 S += '<'; 2480 S += (*I)->getNameAsString(); 2481 S += '>'; 2482 } 2483 S += '"'; 2484 } 2485 return; 2486 } 2487 else if (const PointerType *PT = T->getAsPointerType()) { 2488 QualType PointeeTy = PT->getPointeeType(); 2489 bool isReadOnly = false; 2490 // For historical/compatibility reasons, the read-only qualifier of the 2491 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2492 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2493 // Also, do not emit the 'r' for anything but the outermost type! 2494 if (dyn_cast<TypedefType>(T.getTypePtr())) { 2495 if (OutermostType && T.isConstQualified()) { 2496 isReadOnly = true; 2497 S += 'r'; 2498 } 2499 } 2500 else if (OutermostType) { 2501 QualType P = PointeeTy; 2502 while (P->getAsPointerType()) 2503 P = P->getAsPointerType()->getPointeeType(); 2504 if (P.isConstQualified()) { 2505 isReadOnly = true; 2506 S += 'r'; 2507 } 2508 } 2509 if (isReadOnly) { 2510 // Another legacy compatibility encoding. Some ObjC qualifier and type 2511 // combinations need to be rearranged. 2512 // Rewrite "in const" from "nr" to "rn" 2513 const char * s = S.c_str(); 2514 int len = S.length(); 2515 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2516 std::string replace = "rn"; 2517 S.replace(S.end()-2, S.end(), replace); 2518 } 2519 } 2520 if (isObjCIdStructType(PointeeTy)) { 2521 S += '@'; 2522 return; 2523 } 2524 else if (PointeeTy->isObjCInterfaceType()) { 2525 if (!EncodingProperty && 2526 isa<TypedefType>(PointeeTy.getTypePtr())) { 2527 // Another historical/compatibility reason. 2528 // We encode the underlying type which comes out as 2529 // {...}; 2530 S += '^'; 2531 getObjCEncodingForTypeImpl(PointeeTy, S, 2532 false, ExpandPointedToStructures, 2533 NULL); 2534 return; 2535 } 2536 S += '@'; 2537 if (FD || EncodingProperty) { 2538 const ObjCInterfaceType *OIT = 2539 PointeeTy.getUnqualifiedType()->getAsObjCInterfaceType(); 2540 ObjCInterfaceDecl *OI = OIT->getDecl(); 2541 S += '"'; 2542 S += OI->getNameAsCString(); 2543 for (ObjCInterfaceType::qual_iterator I = OIT->qual_begin(), 2544 E = OIT->qual_end(); I != E; ++I) { 2545 S += '<'; 2546 S += (*I)->getNameAsString(); 2547 S += '>'; 2548 } 2549 S += '"'; 2550 } 2551 return; 2552 } else if (isObjCClassStructType(PointeeTy)) { 2553 S += '#'; 2554 return; 2555 } else if (isObjCSelType(PointeeTy)) { 2556 S += ':'; 2557 return; 2558 } 2559 2560 if (PointeeTy->isCharType()) { 2561 // char pointer types should be encoded as '*' unless it is a 2562 // type that has been typedef'd to 'BOOL'. 2563 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2564 S += '*'; 2565 return; 2566 } 2567 } 2568 2569 S += '^'; 2570 getLegacyIntegralTypeEncoding(PointeeTy); 2571 2572 getObjCEncodingForTypeImpl(PointeeTy, S, 2573 false, ExpandPointedToStructures, 2574 NULL); 2575 } else if (const ArrayType *AT = 2576 // Ignore type qualifiers etc. 2577 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2578 if (isa<IncompleteArrayType>(AT)) { 2579 // Incomplete arrays are encoded as a pointer to the array element. 2580 S += '^'; 2581 2582 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2583 false, ExpandStructures, FD); 2584 } else { 2585 S += '['; 2586 2587 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2588 S += llvm::utostr(CAT->getSize().getZExtValue()); 2589 else { 2590 //Variable length arrays are encoded as a regular array with 0 elements. 2591 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2592 S += '0'; 2593 } 2594 2595 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2596 false, ExpandStructures, FD); 2597 S += ']'; 2598 } 2599 } else if (T->getAsFunctionType()) { 2600 S += '?'; 2601 } else if (const RecordType *RTy = T->getAsRecordType()) { 2602 RecordDecl *RDecl = RTy->getDecl(); 2603 S += RDecl->isUnion() ? '(' : '{'; 2604 // Anonymous structures print as '?' 2605 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2606 S += II->getName(); 2607 } else { 2608 S += '?'; 2609 } 2610 if (ExpandStructures) { 2611 S += '='; 2612 for (RecordDecl::field_iterator Field = RDecl->field_begin(*this), 2613 FieldEnd = RDecl->field_end(*this); 2614 Field != FieldEnd; ++Field) { 2615 if (FD) { 2616 S += '"'; 2617 S += Field->getNameAsString(); 2618 S += '"'; 2619 } 2620 2621 // Special case bit-fields. 2622 if (Field->isBitField()) { 2623 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2624 (*Field)); 2625 } else { 2626 QualType qt = Field->getType(); 2627 getLegacyIntegralTypeEncoding(qt); 2628 getObjCEncodingForTypeImpl(qt, S, false, true, 2629 FD); 2630 } 2631 } 2632 } 2633 S += RDecl->isUnion() ? ')' : '}'; 2634 } else if (T->isEnumeralType()) { 2635 if (FD && FD->isBitField()) 2636 EncodeBitField(this, S, FD); 2637 else 2638 S += 'i'; 2639 } else if (T->isBlockPointerType()) { 2640 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2641 } else if (T->isObjCInterfaceType()) { 2642 // @encode(class_name) 2643 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2644 S += '{'; 2645 const IdentifierInfo *II = OI->getIdentifier(); 2646 S += II->getName(); 2647 S += '='; 2648 llvm::SmallVector<FieldDecl*, 32> RecFields; 2649 CollectObjCIvars(OI, RecFields); 2650 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2651 if (RecFields[i]->isBitField()) 2652 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2653 RecFields[i]); 2654 else 2655 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2656 FD); 2657 } 2658 S += '}'; 2659 } 2660 else 2661 assert(0 && "@encode for type not implemented!"); 2662} 2663 2664void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2665 std::string& S) const { 2666 if (QT & Decl::OBJC_TQ_In) 2667 S += 'n'; 2668 if (QT & Decl::OBJC_TQ_Inout) 2669 S += 'N'; 2670 if (QT & Decl::OBJC_TQ_Out) 2671 S += 'o'; 2672 if (QT & Decl::OBJC_TQ_Bycopy) 2673 S += 'O'; 2674 if (QT & Decl::OBJC_TQ_Byref) 2675 S += 'R'; 2676 if (QT & Decl::OBJC_TQ_Oneway) 2677 S += 'V'; 2678} 2679 2680void ASTContext::setBuiltinVaListType(QualType T) 2681{ 2682 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2683 2684 BuiltinVaListType = T; 2685} 2686 2687void ASTContext::setObjCIdType(QualType T) 2688{ 2689 ObjCIdType = T; 2690 2691 const TypedefType *TT = T->getAsTypedefType(); 2692 if (!TT) 2693 return; 2694 2695 TypedefDecl *TD = TT->getDecl(); 2696 2697 // typedef struct objc_object *id; 2698 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2699 // User error - caller will issue diagnostics. 2700 if (!ptr) 2701 return; 2702 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2703 // User error - caller will issue diagnostics. 2704 if (!rec) 2705 return; 2706 IdStructType = rec; 2707} 2708 2709void ASTContext::setObjCSelType(QualType T) 2710{ 2711 ObjCSelType = T; 2712 2713 const TypedefType *TT = T->getAsTypedefType(); 2714 if (!TT) 2715 return; 2716 TypedefDecl *TD = TT->getDecl(); 2717 2718 // typedef struct objc_selector *SEL; 2719 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2720 if (!ptr) 2721 return; 2722 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2723 if (!rec) 2724 return; 2725 SelStructType = rec; 2726} 2727 2728void ASTContext::setObjCProtoType(QualType QT) 2729{ 2730 ObjCProtoType = QT; 2731} 2732 2733void ASTContext::setObjCClassType(QualType T) 2734{ 2735 ObjCClassType = T; 2736 2737 const TypedefType *TT = T->getAsTypedefType(); 2738 if (!TT) 2739 return; 2740 TypedefDecl *TD = TT->getDecl(); 2741 2742 // typedef struct objc_class *Class; 2743 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2744 assert(ptr && "'Class' incorrectly typed"); 2745 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2746 assert(rec && "'Class' incorrectly typed"); 2747 ClassStructType = rec; 2748} 2749 2750void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 2751 assert(ObjCConstantStringType.isNull() && 2752 "'NSConstantString' type already set!"); 2753 2754 ObjCConstantStringType = getObjCInterfaceType(Decl); 2755} 2756 2757/// \brief Retrieve the template name that represents a qualified 2758/// template name such as \c std::vector. 2759TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 2760 bool TemplateKeyword, 2761 TemplateDecl *Template) { 2762 llvm::FoldingSetNodeID ID; 2763 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 2764 2765 void *InsertPos = 0; 2766 QualifiedTemplateName *QTN = 2767 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2768 if (!QTN) { 2769 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 2770 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 2771 } 2772 2773 return TemplateName(QTN); 2774} 2775 2776/// \brief Retrieve the template name that represents a dependent 2777/// template name such as \c MetaFun::template apply. 2778TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 2779 const IdentifierInfo *Name) { 2780 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 2781 2782 llvm::FoldingSetNodeID ID; 2783 DependentTemplateName::Profile(ID, NNS, Name); 2784 2785 void *InsertPos = 0; 2786 DependentTemplateName *QTN = 2787 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2788 2789 if (QTN) 2790 return TemplateName(QTN); 2791 2792 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2793 if (CanonNNS == NNS) { 2794 QTN = new (*this,4) DependentTemplateName(NNS, Name); 2795 } else { 2796 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 2797 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 2798 } 2799 2800 DependentTemplateNames.InsertNode(QTN, InsertPos); 2801 return TemplateName(QTN); 2802} 2803 2804/// getFromTargetType - Given one of the integer types provided by 2805/// TargetInfo, produce the corresponding type. The unsigned @p Type 2806/// is actually a value of type @c TargetInfo::IntType. 2807QualType ASTContext::getFromTargetType(unsigned Type) const { 2808 switch (Type) { 2809 case TargetInfo::NoInt: return QualType(); 2810 case TargetInfo::SignedShort: return ShortTy; 2811 case TargetInfo::UnsignedShort: return UnsignedShortTy; 2812 case TargetInfo::SignedInt: return IntTy; 2813 case TargetInfo::UnsignedInt: return UnsignedIntTy; 2814 case TargetInfo::SignedLong: return LongTy; 2815 case TargetInfo::UnsignedLong: return UnsignedLongTy; 2816 case TargetInfo::SignedLongLong: return LongLongTy; 2817 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 2818 } 2819 2820 assert(false && "Unhandled TargetInfo::IntType value"); 2821 return QualType(); 2822} 2823 2824//===----------------------------------------------------------------------===// 2825// Type Predicates. 2826//===----------------------------------------------------------------------===// 2827 2828/// isObjCNSObjectType - Return true if this is an NSObject object using 2829/// NSObject attribute on a c-style pointer type. 2830/// FIXME - Make it work directly on types. 2831/// 2832bool ASTContext::isObjCNSObjectType(QualType Ty) const { 2833 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2834 if (TypedefDecl *TD = TDT->getDecl()) 2835 if (TD->getAttr<ObjCNSObjectAttr>()) 2836 return true; 2837 } 2838 return false; 2839} 2840 2841/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 2842/// to an object type. This includes "id" and "Class" (two 'special' pointers 2843/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 2844/// ID type). 2845bool ASTContext::isObjCObjectPointerType(QualType Ty) const { 2846 if (Ty->isObjCQualifiedIdType()) 2847 return true; 2848 2849 // Blocks are objects. 2850 if (Ty->isBlockPointerType()) 2851 return true; 2852 2853 // All other object types are pointers. 2854 const PointerType *PT = Ty->getAsPointerType(); 2855 if (PT == 0) 2856 return false; 2857 2858 // If this a pointer to an interface (e.g. NSString*), it is ok. 2859 if (PT->getPointeeType()->isObjCInterfaceType() || 2860 // If is has NSObject attribute, OK as well. 2861 isObjCNSObjectType(Ty)) 2862 return true; 2863 2864 // Check to see if this is 'id' or 'Class', both of which are typedefs for 2865 // pointer types. This looks for the typedef specifically, not for the 2866 // underlying type. Iteratively strip off typedefs so that we can handle 2867 // typedefs of typedefs. 2868 while (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2869 if (Ty.getUnqualifiedType() == getObjCIdType() || 2870 Ty.getUnqualifiedType() == getObjCClassType()) 2871 return true; 2872 2873 Ty = TDT->getDecl()->getUnderlyingType(); 2874 } 2875 2876 return false; 2877} 2878 2879/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 2880/// garbage collection attribute. 2881/// 2882QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 2883 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 2884 if (getLangOptions().ObjC1 && 2885 getLangOptions().getGCMode() != LangOptions::NonGC) { 2886 GCAttrs = Ty.getObjCGCAttr(); 2887 // Default behavious under objective-c's gc is for objective-c pointers 2888 // (or pointers to them) be treated as though they were declared 2889 // as __strong. 2890 if (GCAttrs == QualType::GCNone) { 2891 if (isObjCObjectPointerType(Ty)) 2892 GCAttrs = QualType::Strong; 2893 else if (Ty->isPointerType()) 2894 return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType()); 2895 } 2896 // Non-pointers have none gc'able attribute regardless of the attribute 2897 // set on them. 2898 else if (!Ty->isPointerType() && !isObjCObjectPointerType(Ty)) 2899 return QualType::GCNone; 2900 } 2901 return GCAttrs; 2902} 2903 2904//===----------------------------------------------------------------------===// 2905// Type Compatibility Testing 2906//===----------------------------------------------------------------------===// 2907 2908/// areCompatVectorTypes - Return true if the two specified vector types are 2909/// compatible. 2910static bool areCompatVectorTypes(const VectorType *LHS, 2911 const VectorType *RHS) { 2912 assert(LHS->isCanonical() && RHS->isCanonical()); 2913 return LHS->getElementType() == RHS->getElementType() && 2914 LHS->getNumElements() == RHS->getNumElements(); 2915} 2916 2917/// canAssignObjCInterfaces - Return true if the two interface types are 2918/// compatible for assignment from RHS to LHS. This handles validation of any 2919/// protocol qualifiers on the LHS or RHS. 2920/// 2921bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 2922 const ObjCInterfaceType *RHS) { 2923 // Verify that the base decls are compatible: the RHS must be a subclass of 2924 // the LHS. 2925 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 2926 return false; 2927 2928 // RHS must have a superset of the protocols in the LHS. If the LHS is not 2929 // protocol qualified at all, then we are good. 2930 if (!isa<ObjCQualifiedInterfaceType>(LHS)) 2931 return true; 2932 2933 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 2934 // isn't a superset. 2935 if (!isa<ObjCQualifiedInterfaceType>(RHS)) 2936 return true; // FIXME: should return false! 2937 2938 // Finally, we must have two protocol-qualified interfaces. 2939 const ObjCQualifiedInterfaceType *LHSP =cast<ObjCQualifiedInterfaceType>(LHS); 2940 const ObjCQualifiedInterfaceType *RHSP =cast<ObjCQualifiedInterfaceType>(RHS); 2941 2942 // All LHS protocols must have a presence on the RHS. 2943 assert(LHSP->qual_begin() != LHSP->qual_end() && "Empty LHS protocol list?"); 2944 2945 for (ObjCQualifiedInterfaceType::qual_iterator LHSPI = LHSP->qual_begin(), 2946 LHSPE = LHSP->qual_end(); 2947 LHSPI != LHSPE; LHSPI++) { 2948 bool RHSImplementsProtocol = false; 2949 2950 // If the RHS doesn't implement the protocol on the left, the types 2951 // are incompatible. 2952 for (ObjCQualifiedInterfaceType::qual_iterator RHSPI = RHSP->qual_begin(), 2953 RHSPE = RHSP->qual_end(); 2954 !RHSImplementsProtocol && (RHSPI != RHSPE); RHSPI++) { 2955 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) 2956 RHSImplementsProtocol = true; 2957 } 2958 // FIXME: For better diagnostics, consider passing back the protocol name. 2959 if (!RHSImplementsProtocol) 2960 return false; 2961 } 2962 // The RHS implements all protocols listed on the LHS. 2963 return true; 2964} 2965 2966bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 2967 // get the "pointed to" types 2968 const PointerType *LHSPT = LHS->getAsPointerType(); 2969 const PointerType *RHSPT = RHS->getAsPointerType(); 2970 2971 if (!LHSPT || !RHSPT) 2972 return false; 2973 2974 QualType lhptee = LHSPT->getPointeeType(); 2975 QualType rhptee = RHSPT->getPointeeType(); 2976 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2977 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2978 // ID acts sort of like void* for ObjC interfaces 2979 if (LHSIface && isObjCIdStructType(rhptee)) 2980 return true; 2981 if (RHSIface && isObjCIdStructType(lhptee)) 2982 return true; 2983 if (!LHSIface || !RHSIface) 2984 return false; 2985 return canAssignObjCInterfaces(LHSIface, RHSIface) || 2986 canAssignObjCInterfaces(RHSIface, LHSIface); 2987} 2988 2989/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 2990/// both shall have the identically qualified version of a compatible type. 2991/// C99 6.2.7p1: Two types have compatible types if their types are the 2992/// same. See 6.7.[2,3,5] for additional rules. 2993bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 2994 return !mergeTypes(LHS, RHS).isNull(); 2995} 2996 2997QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 2998 const FunctionType *lbase = lhs->getAsFunctionType(); 2999 const FunctionType *rbase = rhs->getAsFunctionType(); 3000 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3001 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3002 bool allLTypes = true; 3003 bool allRTypes = true; 3004 3005 // Check return type 3006 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3007 if (retType.isNull()) return QualType(); 3008 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3009 allLTypes = false; 3010 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3011 allRTypes = false; 3012 3013 if (lproto && rproto) { // two C99 style function prototypes 3014 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3015 "C++ shouldn't be here"); 3016 unsigned lproto_nargs = lproto->getNumArgs(); 3017 unsigned rproto_nargs = rproto->getNumArgs(); 3018 3019 // Compatible functions must have the same number of arguments 3020 if (lproto_nargs != rproto_nargs) 3021 return QualType(); 3022 3023 // Variadic and non-variadic functions aren't compatible 3024 if (lproto->isVariadic() != rproto->isVariadic()) 3025 return QualType(); 3026 3027 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3028 return QualType(); 3029 3030 // Check argument compatibility 3031 llvm::SmallVector<QualType, 10> types; 3032 for (unsigned i = 0; i < lproto_nargs; i++) { 3033 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3034 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3035 QualType argtype = mergeTypes(largtype, rargtype); 3036 if (argtype.isNull()) return QualType(); 3037 types.push_back(argtype); 3038 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3039 allLTypes = false; 3040 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3041 allRTypes = false; 3042 } 3043 if (allLTypes) return lhs; 3044 if (allRTypes) return rhs; 3045 return getFunctionType(retType, types.begin(), types.size(), 3046 lproto->isVariadic(), lproto->getTypeQuals()); 3047 } 3048 3049 if (lproto) allRTypes = false; 3050 if (rproto) allLTypes = false; 3051 3052 const FunctionProtoType *proto = lproto ? lproto : rproto; 3053 if (proto) { 3054 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3055 if (proto->isVariadic()) return QualType(); 3056 // Check that the types are compatible with the types that 3057 // would result from default argument promotions (C99 6.7.5.3p15). 3058 // The only types actually affected are promotable integer 3059 // types and floats, which would be passed as a different 3060 // type depending on whether the prototype is visible. 3061 unsigned proto_nargs = proto->getNumArgs(); 3062 for (unsigned i = 0; i < proto_nargs; ++i) { 3063 QualType argTy = proto->getArgType(i); 3064 if (argTy->isPromotableIntegerType() || 3065 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3066 return QualType(); 3067 } 3068 3069 if (allLTypes) return lhs; 3070 if (allRTypes) return rhs; 3071 return getFunctionType(retType, proto->arg_type_begin(), 3072 proto->getNumArgs(), lproto->isVariadic(), 3073 lproto->getTypeQuals()); 3074 } 3075 3076 if (allLTypes) return lhs; 3077 if (allRTypes) return rhs; 3078 return getFunctionNoProtoType(retType); 3079} 3080 3081QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3082 // C++ [expr]: If an expression initially has the type "reference to T", the 3083 // type is adjusted to "T" prior to any further analysis, the expression 3084 // designates the object or function denoted by the reference, and the 3085 // expression is an lvalue unless the reference is an rvalue reference and 3086 // the expression is a function call (possibly inside parentheses). 3087 // FIXME: C++ shouldn't be going through here! The rules are different 3088 // enough that they should be handled separately. 3089 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3090 // shouldn't be going through here! 3091 if (const ReferenceType *RT = LHS->getAsReferenceType()) 3092 LHS = RT->getPointeeType(); 3093 if (const ReferenceType *RT = RHS->getAsReferenceType()) 3094 RHS = RT->getPointeeType(); 3095 3096 QualType LHSCan = getCanonicalType(LHS), 3097 RHSCan = getCanonicalType(RHS); 3098 3099 // If two types are identical, they are compatible. 3100 if (LHSCan == RHSCan) 3101 return LHS; 3102 3103 // If the qualifiers are different, the types aren't compatible 3104 // Note that we handle extended qualifiers later, in the 3105 // case for ExtQualType. 3106 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3107 return QualType(); 3108 3109 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3110 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3111 3112 // We want to consider the two function types to be the same for these 3113 // comparisons, just force one to the other. 3114 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3115 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3116 3117 // Strip off objc_gc attributes off the top level so they can be merged. 3118 // This is a complete mess, but the attribute itself doesn't make much sense. 3119 if (RHSClass == Type::ExtQual) { 3120 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3121 if (GCAttr != QualType::GCNone) { 3122 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3123 // __weak attribute must appear on both declarations. 3124 // __strong attribue is redundant if other decl is an objective-c 3125 // object pointer (or decorated with __strong attribute); otherwise 3126 // issue error. 3127 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3128 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3129 LHSCan->isPointerType() && !isObjCObjectPointerType(LHSCan) && 3130 !isObjCIdStructType(LHSCan->getAsPointerType()->getPointeeType()))) 3131 return QualType(); 3132 3133 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3134 RHS.getCVRQualifiers()); 3135 QualType Result = mergeTypes(LHS, RHS); 3136 if (!Result.isNull()) { 3137 if (Result.getObjCGCAttr() == QualType::GCNone) 3138 Result = getObjCGCQualType(Result, GCAttr); 3139 else if (Result.getObjCGCAttr() != GCAttr) 3140 Result = QualType(); 3141 } 3142 return Result; 3143 } 3144 } 3145 if (LHSClass == Type::ExtQual) { 3146 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3147 if (GCAttr != QualType::GCNone) { 3148 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3149 // __weak attribute must appear on both declarations. __strong 3150 // __strong attribue is redundant if other decl is an objective-c 3151 // object pointer (or decorated with __strong attribute); otherwise 3152 // issue error. 3153 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3154 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3155 RHSCan->isPointerType() && !isObjCObjectPointerType(RHSCan) && 3156 !isObjCIdStructType(RHSCan->getAsPointerType()->getPointeeType()))) 3157 return QualType(); 3158 3159 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3160 LHS.getCVRQualifiers()); 3161 QualType Result = mergeTypes(LHS, RHS); 3162 if (!Result.isNull()) { 3163 if (Result.getObjCGCAttr() == QualType::GCNone) 3164 Result = getObjCGCQualType(Result, GCAttr); 3165 else if (Result.getObjCGCAttr() != GCAttr) 3166 Result = QualType(); 3167 } 3168 return Result; 3169 } 3170 } 3171 3172 // Same as above for arrays 3173 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3174 LHSClass = Type::ConstantArray; 3175 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3176 RHSClass = Type::ConstantArray; 3177 3178 // Canonicalize ExtVector -> Vector. 3179 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3180 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3181 3182 // Consider qualified interfaces and interfaces the same. 3183 if (LHSClass == Type::ObjCQualifiedInterface) LHSClass = Type::ObjCInterface; 3184 if (RHSClass == Type::ObjCQualifiedInterface) RHSClass = Type::ObjCInterface; 3185 3186 // If the canonical type classes don't match. 3187 if (LHSClass != RHSClass) { 3188 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3189 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3190 3191 // 'id' and 'Class' act sort of like void* for ObjC interfaces 3192 if (LHSIface && (isObjCIdStructType(RHS) || isObjCClassStructType(RHS))) 3193 return LHS; 3194 if (RHSIface && (isObjCIdStructType(LHS) || isObjCClassStructType(LHS))) 3195 return RHS; 3196 3197 // ID is compatible with all qualified id types. 3198 if (LHS->isObjCQualifiedIdType()) { 3199 if (const PointerType *PT = RHS->getAsPointerType()) { 3200 QualType pType = PT->getPointeeType(); 3201 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3202 return LHS; 3203 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3204 // Unfortunately, this API is part of Sema (which we don't have access 3205 // to. Need to refactor. The following check is insufficient, since we 3206 // need to make sure the class implements the protocol. 3207 if (pType->isObjCInterfaceType()) 3208 return LHS; 3209 } 3210 } 3211 if (RHS->isObjCQualifiedIdType()) { 3212 if (const PointerType *PT = LHS->getAsPointerType()) { 3213 QualType pType = PT->getPointeeType(); 3214 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3215 return RHS; 3216 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3217 // Unfortunately, this API is part of Sema (which we don't have access 3218 // to. Need to refactor. The following check is insufficient, since we 3219 // need to make sure the class implements the protocol. 3220 if (pType->isObjCInterfaceType()) 3221 return RHS; 3222 } 3223 } 3224 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3225 // a signed integer type, or an unsigned integer type. 3226 if (const EnumType* ETy = LHS->getAsEnumType()) { 3227 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3228 return RHS; 3229 } 3230 if (const EnumType* ETy = RHS->getAsEnumType()) { 3231 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3232 return LHS; 3233 } 3234 3235 return QualType(); 3236 } 3237 3238 // The canonical type classes match. 3239 switch (LHSClass) { 3240#define TYPE(Class, Base) 3241#define ABSTRACT_TYPE(Class, Base) 3242#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3243#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3244#include "clang/AST/TypeNodes.def" 3245 assert(false && "Non-canonical and dependent types shouldn't get here"); 3246 return QualType(); 3247 3248 case Type::LValueReference: 3249 case Type::RValueReference: 3250 case Type::MemberPointer: 3251 assert(false && "C++ should never be in mergeTypes"); 3252 return QualType(); 3253 3254 case Type::IncompleteArray: 3255 case Type::VariableArray: 3256 case Type::FunctionProto: 3257 case Type::ExtVector: 3258 case Type::ObjCQualifiedInterface: 3259 assert(false && "Types are eliminated above"); 3260 return QualType(); 3261 3262 case Type::Pointer: 3263 { 3264 // Merge two pointer types, while trying to preserve typedef info 3265 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 3266 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 3267 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3268 if (ResultType.isNull()) return QualType(); 3269 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3270 return LHS; 3271 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3272 return RHS; 3273 return getPointerType(ResultType); 3274 } 3275 case Type::BlockPointer: 3276 { 3277 // Merge two block pointer types, while trying to preserve typedef info 3278 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 3279 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 3280 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3281 if (ResultType.isNull()) return QualType(); 3282 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3283 return LHS; 3284 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3285 return RHS; 3286 return getBlockPointerType(ResultType); 3287 } 3288 case Type::ConstantArray: 3289 { 3290 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3291 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3292 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3293 return QualType(); 3294 3295 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3296 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3297 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3298 if (ResultType.isNull()) return QualType(); 3299 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3300 return LHS; 3301 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3302 return RHS; 3303 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3304 ArrayType::ArraySizeModifier(), 0); 3305 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3306 ArrayType::ArraySizeModifier(), 0); 3307 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3308 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3309 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3310 return LHS; 3311 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3312 return RHS; 3313 if (LVAT) { 3314 // FIXME: This isn't correct! But tricky to implement because 3315 // the array's size has to be the size of LHS, but the type 3316 // has to be different. 3317 return LHS; 3318 } 3319 if (RVAT) { 3320 // FIXME: This isn't correct! But tricky to implement because 3321 // the array's size has to be the size of RHS, but the type 3322 // has to be different. 3323 return RHS; 3324 } 3325 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3326 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3327 return getIncompleteArrayType(ResultType, ArrayType::ArraySizeModifier(),0); 3328 } 3329 case Type::FunctionNoProto: 3330 return mergeFunctionTypes(LHS, RHS); 3331 case Type::Record: 3332 case Type::Enum: 3333 // FIXME: Why are these compatible? 3334 if (isObjCIdStructType(LHS) && isObjCClassStructType(RHS)) return LHS; 3335 if (isObjCClassStructType(LHS) && isObjCIdStructType(RHS)) return LHS; 3336 return QualType(); 3337 case Type::Builtin: 3338 // Only exactly equal builtin types are compatible, which is tested above. 3339 return QualType(); 3340 case Type::Complex: 3341 // Distinct complex types are incompatible. 3342 return QualType(); 3343 case Type::Vector: 3344 // FIXME: The merged type should be an ExtVector! 3345 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3346 return LHS; 3347 return QualType(); 3348 case Type::ObjCInterface: { 3349 // Check if the interfaces are assignment compatible. 3350 // FIXME: This should be type compatibility, e.g. whether 3351 // "LHS x; RHS x;" at global scope is legal. 3352 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3353 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3354 if (LHSIface && RHSIface && 3355 canAssignObjCInterfaces(LHSIface, RHSIface)) 3356 return LHS; 3357 3358 return QualType(); 3359 } 3360 case Type::ObjCObjectPointer: 3361 // FIXME: finish 3362 // Distinct qualified id's are not compatible. 3363 return QualType(); 3364 case Type::FixedWidthInt: 3365 // Distinct fixed-width integers are not compatible. 3366 return QualType(); 3367 case Type::ExtQual: 3368 // FIXME: ExtQual types can be compatible even if they're not 3369 // identical! 3370 return QualType(); 3371 // First attempt at an implementation, but I'm not really sure it's 3372 // right... 3373#if 0 3374 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3375 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3376 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3377 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3378 return QualType(); 3379 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3380 LHSBase = QualType(LQual->getBaseType(), 0); 3381 RHSBase = QualType(RQual->getBaseType(), 0); 3382 ResultType = mergeTypes(LHSBase, RHSBase); 3383 if (ResultType.isNull()) return QualType(); 3384 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3385 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3386 return LHS; 3387 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3388 return RHS; 3389 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3390 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3391 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3392 return ResultType; 3393#endif 3394 3395 case Type::TemplateSpecialization: 3396 assert(false && "Dependent types have no size"); 3397 break; 3398 } 3399 3400 return QualType(); 3401} 3402 3403//===----------------------------------------------------------------------===// 3404// Integer Predicates 3405//===----------------------------------------------------------------------===// 3406 3407unsigned ASTContext::getIntWidth(QualType T) { 3408 if (T == BoolTy) 3409 return 1; 3410 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3411 return FWIT->getWidth(); 3412 } 3413 // For builtin types, just use the standard type sizing method 3414 return (unsigned)getTypeSize(T); 3415} 3416 3417QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3418 assert(T->isSignedIntegerType() && "Unexpected type"); 3419 if (const EnumType* ETy = T->getAsEnumType()) 3420 T = ETy->getDecl()->getIntegerType(); 3421 const BuiltinType* BTy = T->getAsBuiltinType(); 3422 assert (BTy && "Unexpected signed integer type"); 3423 switch (BTy->getKind()) { 3424 case BuiltinType::Char_S: 3425 case BuiltinType::SChar: 3426 return UnsignedCharTy; 3427 case BuiltinType::Short: 3428 return UnsignedShortTy; 3429 case BuiltinType::Int: 3430 return UnsignedIntTy; 3431 case BuiltinType::Long: 3432 return UnsignedLongTy; 3433 case BuiltinType::LongLong: 3434 return UnsignedLongLongTy; 3435 case BuiltinType::Int128: 3436 return UnsignedInt128Ty; 3437 default: 3438 assert(0 && "Unexpected signed integer type"); 3439 return QualType(); 3440 } 3441} 3442 3443ExternalASTSource::~ExternalASTSource() { } 3444 3445void ExternalASTSource::PrintStats() { } 3446 3447 3448//===----------------------------------------------------------------------===// 3449// Builtin Type Computation 3450//===----------------------------------------------------------------------===// 3451 3452/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3453/// pointer over the consumed characters. This returns the resultant type. 3454static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3455 ASTContext::GetBuiltinTypeError &Error, 3456 bool AllowTypeModifiers = true) { 3457 // Modifiers. 3458 int HowLong = 0; 3459 bool Signed = false, Unsigned = false; 3460 3461 // Read the modifiers first. 3462 bool Done = false; 3463 while (!Done) { 3464 switch (*Str++) { 3465 default: Done = true; --Str; break; 3466 case 'S': 3467 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3468 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3469 Signed = true; 3470 break; 3471 case 'U': 3472 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 3473 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 3474 Unsigned = true; 3475 break; 3476 case 'L': 3477 assert(HowLong <= 2 && "Can't have LLLL modifier"); 3478 ++HowLong; 3479 break; 3480 } 3481 } 3482 3483 QualType Type; 3484 3485 // Read the base type. 3486 switch (*Str++) { 3487 default: assert(0 && "Unknown builtin type letter!"); 3488 case 'v': 3489 assert(HowLong == 0 && !Signed && !Unsigned && 3490 "Bad modifiers used with 'v'!"); 3491 Type = Context.VoidTy; 3492 break; 3493 case 'f': 3494 assert(HowLong == 0 && !Signed && !Unsigned && 3495 "Bad modifiers used with 'f'!"); 3496 Type = Context.FloatTy; 3497 break; 3498 case 'd': 3499 assert(HowLong < 2 && !Signed && !Unsigned && 3500 "Bad modifiers used with 'd'!"); 3501 if (HowLong) 3502 Type = Context.LongDoubleTy; 3503 else 3504 Type = Context.DoubleTy; 3505 break; 3506 case 's': 3507 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 3508 if (Unsigned) 3509 Type = Context.UnsignedShortTy; 3510 else 3511 Type = Context.ShortTy; 3512 break; 3513 case 'i': 3514 if (HowLong == 3) 3515 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 3516 else if (HowLong == 2) 3517 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 3518 else if (HowLong == 1) 3519 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 3520 else 3521 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 3522 break; 3523 case 'c': 3524 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 3525 if (Signed) 3526 Type = Context.SignedCharTy; 3527 else if (Unsigned) 3528 Type = Context.UnsignedCharTy; 3529 else 3530 Type = Context.CharTy; 3531 break; 3532 case 'b': // boolean 3533 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 3534 Type = Context.BoolTy; 3535 break; 3536 case 'z': // size_t. 3537 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 3538 Type = Context.getSizeType(); 3539 break; 3540 case 'F': 3541 Type = Context.getCFConstantStringType(); 3542 break; 3543 case 'a': 3544 Type = Context.getBuiltinVaListType(); 3545 assert(!Type.isNull() && "builtin va list type not initialized!"); 3546 break; 3547 case 'A': 3548 // This is a "reference" to a va_list; however, what exactly 3549 // this means depends on how va_list is defined. There are two 3550 // different kinds of va_list: ones passed by value, and ones 3551 // passed by reference. An example of a by-value va_list is 3552 // x86, where va_list is a char*. An example of by-ref va_list 3553 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 3554 // we want this argument to be a char*&; for x86-64, we want 3555 // it to be a __va_list_tag*. 3556 Type = Context.getBuiltinVaListType(); 3557 assert(!Type.isNull() && "builtin va list type not initialized!"); 3558 if (Type->isArrayType()) { 3559 Type = Context.getArrayDecayedType(Type); 3560 } else { 3561 Type = Context.getLValueReferenceType(Type); 3562 } 3563 break; 3564 case 'V': { 3565 char *End; 3566 3567 unsigned NumElements = strtoul(Str, &End, 10); 3568 assert(End != Str && "Missing vector size"); 3569 3570 Str = End; 3571 3572 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 3573 Type = Context.getVectorType(ElementType, NumElements); 3574 break; 3575 } 3576 case 'P': { 3577 IdentifierInfo *II = &Context.Idents.get("FILE"); 3578 DeclContext::lookup_result Lookup 3579 = Context.getTranslationUnitDecl()->lookup(Context, II); 3580 if (Lookup.first != Lookup.second && isa<TypeDecl>(*Lookup.first)) { 3581 Type = Context.getTypeDeclType(cast<TypeDecl>(*Lookup.first)); 3582 break; 3583 } 3584 else { 3585 Error = ASTContext::GE_Missing_FILE; 3586 return QualType(); 3587 } 3588 } 3589 } 3590 3591 if (!AllowTypeModifiers) 3592 return Type; 3593 3594 Done = false; 3595 while (!Done) { 3596 switch (*Str++) { 3597 default: Done = true; --Str; break; 3598 case '*': 3599 Type = Context.getPointerType(Type); 3600 break; 3601 case '&': 3602 Type = Context.getLValueReferenceType(Type); 3603 break; 3604 // FIXME: There's no way to have a built-in with an rvalue ref arg. 3605 case 'C': 3606 Type = Type.getQualifiedType(QualType::Const); 3607 break; 3608 } 3609 } 3610 3611 return Type; 3612} 3613 3614/// GetBuiltinType - Return the type for the specified builtin. 3615QualType ASTContext::GetBuiltinType(unsigned id, 3616 GetBuiltinTypeError &Error) { 3617 const char *TypeStr = BuiltinInfo.GetTypeString(id); 3618 3619 llvm::SmallVector<QualType, 8> ArgTypes; 3620 3621 Error = GE_None; 3622 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 3623 if (Error != GE_None) 3624 return QualType(); 3625 while (TypeStr[0] && TypeStr[0] != '.') { 3626 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 3627 if (Error != GE_None) 3628 return QualType(); 3629 3630 // Do array -> pointer decay. The builtin should use the decayed type. 3631 if (Ty->isArrayType()) 3632 Ty = getArrayDecayedType(Ty); 3633 3634 ArgTypes.push_back(Ty); 3635 } 3636 3637 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 3638 "'.' should only occur at end of builtin type list!"); 3639 3640 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 3641 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 3642 return getFunctionNoProtoType(ResType); 3643 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 3644 TypeStr[0] == '.', 0); 3645} 3646