ASTContext.cpp revision da04639a40e01d8d2ee891c075b271fd272d3d53
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/RecordLayout.h" 20#include "clang/Basic/SourceManager.h" 21#include "clang/Basic/TargetInfo.h" 22#include "llvm/ADT/StringExtras.h" 23#include "llvm/Bitcode/Serialize.h" 24#include "llvm/Bitcode/Deserialize.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 bool FreeMem, unsigned size_reserve) : 37 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 38 ObjCFastEnumerationStateTypeDecl(0), SourceMgr(SM), LangOpts(LOpts), 39 FreeMemory(FreeMem), Target(t), Idents(idents), Selectors(sels) { 40 if (size_reserve > 0) Types.reserve(size_reserve); 41 InitBuiltinTypes(); 42 BuiltinInfo.InitializeBuiltins(idents, Target, LangOpts.NoBuiltin); 43 TUDecl = TranslationUnitDecl::Create(*this); 44} 45 46ASTContext::~ASTContext() { 47 // Deallocate all the types. 48 while (!Types.empty()) { 49 Types.back()->Destroy(*this); 50 Types.pop_back(); 51 } 52 53 { 54 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 55 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 56 while (I != E) { 57 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 58 delete R; 59 } 60 } 61 62 { 63 llvm::DenseMap<const ObjCInterfaceDecl*, const ASTRecordLayout*>::iterator 64 I = ASTObjCInterfaces.begin(), E = ASTObjCInterfaces.end(); 65 while (I != E) { 66 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 67 delete R; 68 } 69 } 70 71 { 72 llvm::DenseMap<const ObjCInterfaceDecl*, const RecordDecl*>::iterator 73 I = ASTRecordForInterface.begin(), E = ASTRecordForInterface.end(); 74 while (I != E) { 75 RecordDecl *R = const_cast<RecordDecl*>((I++)->second); 76 R->Destroy(*this); 77 } 78 } 79 80 // Destroy nested-name-specifiers. 81 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 82 NNS = NestedNameSpecifiers.begin(), 83 NNSEnd = NestedNameSpecifiers.end(); 84 NNS != NNSEnd; 85 /* Increment in loop */) 86 (*NNS++).Destroy(*this); 87 88 if (GlobalNestedNameSpecifier) 89 GlobalNestedNameSpecifier->Destroy(*this); 90 91 TUDecl->Destroy(*this); 92} 93 94void ASTContext::PrintStats() const { 95 fprintf(stderr, "*** AST Context Stats:\n"); 96 fprintf(stderr, " %d types total.\n", (int)Types.size()); 97 unsigned NumBuiltin = 0, NumPointer = 0, NumArray = 0, NumFunctionP = 0; 98 unsigned NumVector = 0, NumComplex = 0, NumBlockPointer = 0; 99 unsigned NumFunctionNP = 0, NumTypeName = 0, NumTagged = 0; 100 unsigned NumLValueReference = 0, NumRValueReference = 0, NumMemberPointer = 0; 101 102 unsigned NumTagStruct = 0, NumTagUnion = 0, NumTagEnum = 0, NumTagClass = 0; 103 unsigned NumObjCInterfaces = 0, NumObjCQualifiedInterfaces = 0; 104 unsigned NumObjCQualifiedIds = 0; 105 unsigned NumTypeOfTypes = 0, NumTypeOfExprTypes = 0; 106 107 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 108 Type *T = Types[i]; 109 if (isa<BuiltinType>(T)) 110 ++NumBuiltin; 111 else if (isa<PointerType>(T)) 112 ++NumPointer; 113 else if (isa<BlockPointerType>(T)) 114 ++NumBlockPointer; 115 else if (isa<LValueReferenceType>(T)) 116 ++NumLValueReference; 117 else if (isa<RValueReferenceType>(T)) 118 ++NumRValueReference; 119 else if (isa<MemberPointerType>(T)) 120 ++NumMemberPointer; 121 else if (isa<ComplexType>(T)) 122 ++NumComplex; 123 else if (isa<ArrayType>(T)) 124 ++NumArray; 125 else if (isa<VectorType>(T)) 126 ++NumVector; 127 else if (isa<FunctionNoProtoType>(T)) 128 ++NumFunctionNP; 129 else if (isa<FunctionProtoType>(T)) 130 ++NumFunctionP; 131 else if (isa<TypedefType>(T)) 132 ++NumTypeName; 133 else if (TagType *TT = dyn_cast<TagType>(T)) { 134 ++NumTagged; 135 switch (TT->getDecl()->getTagKind()) { 136 default: assert(0 && "Unknown tagged type!"); 137 case TagDecl::TK_struct: ++NumTagStruct; break; 138 case TagDecl::TK_union: ++NumTagUnion; break; 139 case TagDecl::TK_class: ++NumTagClass; break; 140 case TagDecl::TK_enum: ++NumTagEnum; break; 141 } 142 } else if (isa<ObjCInterfaceType>(T)) 143 ++NumObjCInterfaces; 144 else if (isa<ObjCQualifiedInterfaceType>(T)) 145 ++NumObjCQualifiedInterfaces; 146 else if (isa<ObjCQualifiedIdType>(T)) 147 ++NumObjCQualifiedIds; 148 else if (isa<TypeOfType>(T)) 149 ++NumTypeOfTypes; 150 else if (isa<TypeOfExprType>(T)) 151 ++NumTypeOfExprTypes; 152 else { 153 QualType(T, 0).dump(); 154 assert(0 && "Unknown type!"); 155 } 156 } 157 158 fprintf(stderr, " %d builtin types\n", NumBuiltin); 159 fprintf(stderr, " %d pointer types\n", NumPointer); 160 fprintf(stderr, " %d block pointer types\n", NumBlockPointer); 161 fprintf(stderr, " %d lvalue reference types\n", NumLValueReference); 162 fprintf(stderr, " %d rvalue reference types\n", NumRValueReference); 163 fprintf(stderr, " %d member pointer types\n", NumMemberPointer); 164 fprintf(stderr, " %d complex types\n", NumComplex); 165 fprintf(stderr, " %d array types\n", NumArray); 166 fprintf(stderr, " %d vector types\n", NumVector); 167 fprintf(stderr, " %d function types with proto\n", NumFunctionP); 168 fprintf(stderr, " %d function types with no proto\n", NumFunctionNP); 169 fprintf(stderr, " %d typename (typedef) types\n", NumTypeName); 170 fprintf(stderr, " %d tagged types\n", NumTagged); 171 fprintf(stderr, " %d struct types\n", NumTagStruct); 172 fprintf(stderr, " %d union types\n", NumTagUnion); 173 fprintf(stderr, " %d class types\n", NumTagClass); 174 fprintf(stderr, " %d enum types\n", NumTagEnum); 175 fprintf(stderr, " %d interface types\n", NumObjCInterfaces); 176 fprintf(stderr, " %d protocol qualified interface types\n", 177 NumObjCQualifiedInterfaces); 178 fprintf(stderr, " %d protocol qualified id types\n", 179 NumObjCQualifiedIds); 180 fprintf(stderr, " %d typeof types\n", NumTypeOfTypes); 181 fprintf(stderr, " %d typeof exprs\n", NumTypeOfExprTypes); 182 183 fprintf(stderr, "Total bytes = %d\n", int(NumBuiltin*sizeof(BuiltinType)+ 184 NumPointer*sizeof(PointerType)+NumArray*sizeof(ArrayType)+ 185 NumComplex*sizeof(ComplexType)+NumVector*sizeof(VectorType)+ 186 NumLValueReference*sizeof(LValueReferenceType)+ 187 NumRValueReference*sizeof(RValueReferenceType)+ 188 NumMemberPointer*sizeof(MemberPointerType)+ 189 NumFunctionP*sizeof(FunctionProtoType)+ 190 NumFunctionNP*sizeof(FunctionNoProtoType)+ 191 NumTypeName*sizeof(TypedefType)+NumTagged*sizeof(TagType)+ 192 NumTypeOfTypes*sizeof(TypeOfType)+NumTypeOfExprTypes*sizeof(TypeOfExprType))); 193} 194 195 196void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 197 Types.push_back((R = QualType(new (*this,8) BuiltinType(K),0)).getTypePtr()); 198} 199 200void ASTContext::InitBuiltinTypes() { 201 assert(VoidTy.isNull() && "Context reinitialized?"); 202 203 // C99 6.2.5p19. 204 InitBuiltinType(VoidTy, BuiltinType::Void); 205 206 // C99 6.2.5p2. 207 InitBuiltinType(BoolTy, BuiltinType::Bool); 208 // C99 6.2.5p3. 209 if (Target.isCharSigned()) 210 InitBuiltinType(CharTy, BuiltinType::Char_S); 211 else 212 InitBuiltinType(CharTy, BuiltinType::Char_U); 213 // C99 6.2.5p4. 214 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 215 InitBuiltinType(ShortTy, BuiltinType::Short); 216 InitBuiltinType(IntTy, BuiltinType::Int); 217 InitBuiltinType(LongTy, BuiltinType::Long); 218 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 219 220 // C99 6.2.5p6. 221 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 222 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 223 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 224 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 225 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 226 227 // C99 6.2.5p10. 228 InitBuiltinType(FloatTy, BuiltinType::Float); 229 InitBuiltinType(DoubleTy, BuiltinType::Double); 230 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 231 232 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 233 InitBuiltinType(WCharTy, BuiltinType::WChar); 234 else // C99 235 WCharTy = getFromTargetType(Target.getWCharType()); 236 237 // Placeholder type for functions. 238 InitBuiltinType(OverloadTy, BuiltinType::Overload); 239 240 // Placeholder type for type-dependent expressions whose type is 241 // completely unknown. No code should ever check a type against 242 // DependentTy and users should never see it; however, it is here to 243 // help diagnose failures to properly check for type-dependent 244 // expressions. 245 InitBuiltinType(DependentTy, BuiltinType::Dependent); 246 247 // C99 6.2.5p11. 248 FloatComplexTy = getComplexType(FloatTy); 249 DoubleComplexTy = getComplexType(DoubleTy); 250 LongDoubleComplexTy = getComplexType(LongDoubleTy); 251 252 BuiltinVaListType = QualType(); 253 ObjCIdType = QualType(); 254 IdStructType = 0; 255 ObjCClassType = QualType(); 256 ClassStructType = 0; 257 258 ObjCConstantStringType = QualType(); 259 260 // void * type 261 VoidPtrTy = getPointerType(VoidTy); 262} 263 264//===----------------------------------------------------------------------===// 265// Type Sizing and Analysis 266//===----------------------------------------------------------------------===// 267 268/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 269/// scalar floating point type. 270const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 271 const BuiltinType *BT = T->getAsBuiltinType(); 272 assert(BT && "Not a floating point type!"); 273 switch (BT->getKind()) { 274 default: assert(0 && "Not a floating point type!"); 275 case BuiltinType::Float: return Target.getFloatFormat(); 276 case BuiltinType::Double: return Target.getDoubleFormat(); 277 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 278 } 279} 280 281/// getDeclAlign - Return a conservative estimate of the alignment of the 282/// specified decl. Note that bitfields do not have a valid alignment, so 283/// this method will assert on them. 284unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 285 unsigned Align = Target.getCharWidth(); 286 287 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 288 Align = std::max(Align, AA->getAlignment()); 289 290 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 291 QualType T = VD->getType(); 292 // Incomplete or function types default to 1. 293 if (!T->isIncompleteType() && !T->isFunctionType()) { 294 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 295 T = cast<ArrayType>(T)->getElementType(); 296 297 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 298 } 299 } 300 301 return Align / Target.getCharWidth(); 302} 303 304/// getTypeSize - Return the size of the specified type, in bits. This method 305/// does not work on incomplete types. 306std::pair<uint64_t, unsigned> 307ASTContext::getTypeInfo(const Type *T) { 308 T = getCanonicalType(T); 309 uint64_t Width=0; 310 unsigned Align=8; 311 switch (T->getTypeClass()) { 312#define TYPE(Class, Base) 313#define ABSTRACT_TYPE(Class, Base) 314#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 315#define DEPENDENT_TYPE(Class, Base) case Type::Class: 316#include "clang/AST/TypeNodes.def" 317 assert(false && "Should not see non-canonical or dependent types"); 318 break; 319 320 case Type::FunctionNoProto: 321 case Type::FunctionProto: 322 case Type::IncompleteArray: 323 assert(0 && "Incomplete types have no size!"); 324 case Type::VariableArray: 325 assert(0 && "VLAs not implemented yet!"); 326 case Type::ConstantArray: { 327 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 328 329 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 330 Width = EltInfo.first*CAT->getSize().getZExtValue(); 331 Align = EltInfo.second; 332 break; 333 } 334 case Type::ExtVector: 335 case Type::Vector: { 336 std::pair<uint64_t, unsigned> EltInfo = 337 getTypeInfo(cast<VectorType>(T)->getElementType()); 338 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 339 Align = Width; 340 // If the alignment is not a power of 2, round up to the next power of 2. 341 // This happens for non-power-of-2 length vectors. 342 // FIXME: this should probably be a target property. 343 Align = 1 << llvm::Log2_32_Ceil(Align); 344 break; 345 } 346 347 case Type::Builtin: 348 switch (cast<BuiltinType>(T)->getKind()) { 349 default: assert(0 && "Unknown builtin type!"); 350 case BuiltinType::Void: 351 assert(0 && "Incomplete types have no size!"); 352 case BuiltinType::Bool: 353 Width = Target.getBoolWidth(); 354 Align = Target.getBoolAlign(); 355 break; 356 case BuiltinType::Char_S: 357 case BuiltinType::Char_U: 358 case BuiltinType::UChar: 359 case BuiltinType::SChar: 360 Width = Target.getCharWidth(); 361 Align = Target.getCharAlign(); 362 break; 363 case BuiltinType::WChar: 364 Width = Target.getWCharWidth(); 365 Align = Target.getWCharAlign(); 366 break; 367 case BuiltinType::UShort: 368 case BuiltinType::Short: 369 Width = Target.getShortWidth(); 370 Align = Target.getShortAlign(); 371 break; 372 case BuiltinType::UInt: 373 case BuiltinType::Int: 374 Width = Target.getIntWidth(); 375 Align = Target.getIntAlign(); 376 break; 377 case BuiltinType::ULong: 378 case BuiltinType::Long: 379 Width = Target.getLongWidth(); 380 Align = Target.getLongAlign(); 381 break; 382 case BuiltinType::ULongLong: 383 case BuiltinType::LongLong: 384 Width = Target.getLongLongWidth(); 385 Align = Target.getLongLongAlign(); 386 break; 387 case BuiltinType::Float: 388 Width = Target.getFloatWidth(); 389 Align = Target.getFloatAlign(); 390 break; 391 case BuiltinType::Double: 392 Width = Target.getDoubleWidth(); 393 Align = Target.getDoubleAlign(); 394 break; 395 case BuiltinType::LongDouble: 396 Width = Target.getLongDoubleWidth(); 397 Align = Target.getLongDoubleAlign(); 398 break; 399 } 400 break; 401 case Type::FixedWidthInt: 402 // FIXME: This isn't precisely correct; the width/alignment should depend 403 // on the available types for the target 404 Width = cast<FixedWidthIntType>(T)->getWidth(); 405 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 406 Align = Width; 407 break; 408 case Type::ExtQual: 409 // FIXME: Pointers into different addr spaces could have different sizes and 410 // alignment requirements: getPointerInfo should take an AddrSpace. 411 return getTypeInfo(QualType(cast<ExtQualType>(T)->getBaseType(), 0)); 412 case Type::ObjCQualifiedId: 413 case Type::ObjCQualifiedClass: 414 case Type::ObjCQualifiedInterface: 415 Width = Target.getPointerWidth(0); 416 Align = Target.getPointerAlign(0); 417 break; 418 case Type::BlockPointer: { 419 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 420 Width = Target.getPointerWidth(AS); 421 Align = Target.getPointerAlign(AS); 422 break; 423 } 424 case Type::Pointer: { 425 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 426 Width = Target.getPointerWidth(AS); 427 Align = Target.getPointerAlign(AS); 428 break; 429 } 430 case Type::LValueReference: 431 case Type::RValueReference: 432 // "When applied to a reference or a reference type, the result is the size 433 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 434 // FIXME: This is wrong for struct layout: a reference in a struct has 435 // pointer size. 436 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 437 case Type::MemberPointer: { 438 // FIXME: This is not only platform- but also ABI-dependent. We follow 439 // the GCC ABI, where pointers to data are one pointer large, pointers to 440 // functions two pointers. But if we want to support ABI compatibility with 441 // other compilers too, we need to delegate this completely to TargetInfo 442 // or some ABI abstraction layer. 443 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 444 unsigned AS = Pointee.getAddressSpace(); 445 Width = Target.getPointerWidth(AS); 446 if (Pointee->isFunctionType()) 447 Width *= 2; 448 Align = Target.getPointerAlign(AS); 449 // GCC aligns at single pointer width. 450 } 451 case Type::Complex: { 452 // Complex types have the same alignment as their elements, but twice the 453 // size. 454 std::pair<uint64_t, unsigned> EltInfo = 455 getTypeInfo(cast<ComplexType>(T)->getElementType()); 456 Width = EltInfo.first*2; 457 Align = EltInfo.second; 458 break; 459 } 460 case Type::ObjCInterface: { 461 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 462 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 463 Width = Layout.getSize(); 464 Align = Layout.getAlignment(); 465 break; 466 } 467 case Type::Record: 468 case Type::Enum: { 469 const TagType *TT = cast<TagType>(T); 470 471 if (TT->getDecl()->isInvalidDecl()) { 472 Width = 1; 473 Align = 1; 474 break; 475 } 476 477 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 478 return getTypeInfo(ET->getDecl()->getIntegerType()); 479 480 const RecordType *RT = cast<RecordType>(TT); 481 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 482 Width = Layout.getSize(); 483 Align = Layout.getAlignment(); 484 break; 485 } 486 487 case Type::TemplateSpecialization: 488 assert(false && "Dependent types have no size"); 489 break; 490 } 491 492 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 493 return std::make_pair(Width, Align); 494} 495 496/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 497/// type for the current target in bits. This can be different than the ABI 498/// alignment in cases where it is beneficial for performance to overalign 499/// a data type. 500unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 501 unsigned ABIAlign = getTypeAlign(T); 502 503 // Doubles should be naturally aligned if possible. 504 if (T->isSpecificBuiltinType(BuiltinType::Double)) 505 return std::max(ABIAlign, 64U); 506 507 return ABIAlign; 508} 509 510 511/// LayoutField - Field layout. 512void ASTRecordLayout::LayoutField(const FieldDecl *FD, unsigned FieldNo, 513 bool IsUnion, unsigned StructPacking, 514 ASTContext &Context) { 515 unsigned FieldPacking = StructPacking; 516 uint64_t FieldOffset = IsUnion ? 0 : Size; 517 uint64_t FieldSize; 518 unsigned FieldAlign; 519 520 // FIXME: Should this override struct packing? Probably we want to 521 // take the minimum? 522 if (const PackedAttr *PA = FD->getAttr<PackedAttr>()) 523 FieldPacking = PA->getAlignment(); 524 525 if (const Expr *BitWidthExpr = FD->getBitWidth()) { 526 // TODO: Need to check this algorithm on other targets! 527 // (tested on Linux-X86) 528 FieldSize = 529 BitWidthExpr->getIntegerConstantExprValue(Context).getZExtValue(); 530 531 std::pair<uint64_t, unsigned> FieldInfo = 532 Context.getTypeInfo(FD->getType()); 533 uint64_t TypeSize = FieldInfo.first; 534 535 // Determine the alignment of this bitfield. The packing 536 // attributes define a maximum and the alignment attribute defines 537 // a minimum. 538 // FIXME: What is the right behavior when the specified alignment 539 // is smaller than the specified packing? 540 FieldAlign = FieldInfo.second; 541 if (FieldPacking) 542 FieldAlign = std::min(FieldAlign, FieldPacking); 543 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 544 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 545 546 // Check if we need to add padding to give the field the correct 547 // alignment. 548 if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize) 549 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 550 551 // Padding members don't affect overall alignment 552 if (!FD->getIdentifier()) 553 FieldAlign = 1; 554 } else { 555 if (FD->getType()->isIncompleteArrayType()) { 556 // This is a flexible array member; we can't directly 557 // query getTypeInfo about these, so we figure it out here. 558 // Flexible array members don't have any size, but they 559 // have to be aligned appropriately for their element type. 560 FieldSize = 0; 561 const ArrayType* ATy = Context.getAsArrayType(FD->getType()); 562 FieldAlign = Context.getTypeAlign(ATy->getElementType()); 563 } else { 564 std::pair<uint64_t, unsigned> FieldInfo = 565 Context.getTypeInfo(FD->getType()); 566 FieldSize = FieldInfo.first; 567 FieldAlign = FieldInfo.second; 568 } 569 570 // Determine the alignment of this bitfield. The packing 571 // attributes define a maximum and the alignment attribute defines 572 // a minimum. Additionally, the packing alignment must be at least 573 // a byte for non-bitfields. 574 // 575 // FIXME: What is the right behavior when the specified alignment 576 // is smaller than the specified packing? 577 if (FieldPacking) 578 FieldAlign = std::min(FieldAlign, std::max(8U, FieldPacking)); 579 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 580 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 581 582 // Round up the current record size to the field's alignment boundary. 583 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 584 } 585 586 // Place this field at the current location. 587 FieldOffsets[FieldNo] = FieldOffset; 588 589 // Reserve space for this field. 590 if (IsUnion) { 591 Size = std::max(Size, FieldSize); 592 } else { 593 Size = FieldOffset + FieldSize; 594 } 595 596 // Remember max struct/class alignment. 597 Alignment = std::max(Alignment, FieldAlign); 598} 599 600void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 601 std::vector<FieldDecl*> &Fields) const { 602 const ObjCInterfaceDecl *SuperClass = OI->getSuperClass(); 603 if (SuperClass) 604 CollectObjCIvars(SuperClass, Fields); 605 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 606 E = OI->ivar_end(); I != E; ++I) { 607 ObjCIvarDecl *IVDecl = (*I); 608 if (!IVDecl->isInvalidDecl()) 609 Fields.push_back(cast<FieldDecl>(IVDecl)); 610 } 611 // look into properties. 612 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 613 E = OI->prop_end(); I != E; ++I) { 614 ObjCPropertyDecl *PDecl = (*I); 615 if (ObjCIvarDecl *IV = PDecl->getPropertyIvarDecl()) 616 Fields.push_back(cast<FieldDecl>(IV)); 617 } 618} 619 620/// addRecordToClass - produces record info. for the class for its 621/// ivars and all those inherited. 622/// 623const RecordDecl *ASTContext::addRecordToClass(const ObjCInterfaceDecl *D) 624{ 625 const RecordDecl *&RD = ASTRecordForInterface[D]; 626 if (RD) 627 return RD; 628 std::vector<FieldDecl*> RecFields; 629 CollectObjCIvars(D, RecFields); 630 RecordDecl *NewRD = RecordDecl::Create(*this, TagDecl::TK_struct, 0, 631 D->getLocation(), 632 D->getIdentifier()); 633 /// FIXME! Can do collection of ivars and adding to the record while 634 /// doing it. 635 for (unsigned int i = 0; i != RecFields.size(); i++) { 636 FieldDecl *Field = FieldDecl::Create(*this, NewRD, 637 RecFields[i]->getLocation(), 638 RecFields[i]->getIdentifier(), 639 RecFields[i]->getType(), 640 RecFields[i]->getBitWidth(), false); 641 NewRD->addDecl(Field); 642 } 643 NewRD->completeDefinition(*this); 644 RD = NewRD; 645 return RD; 646} 647 648/// setFieldDecl - maps a field for the given Ivar reference node. 649// 650void ASTContext::setFieldDecl(const ObjCInterfaceDecl *OI, 651 const ObjCIvarDecl *Ivar, 652 const ObjCIvarRefExpr *MRef) { 653 ASTFieldForIvarRef[MRef] = OI->lookupFieldDeclForIvar(*this, Ivar); 654} 655 656/// getASTObjcInterfaceLayout - Get or compute information about the layout of 657/// the specified Objective C, which indicates its size and ivar 658/// position information. 659const ASTRecordLayout & 660ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 661 // Look up this layout, if already laid out, return what we have. 662 const ASTRecordLayout *&Entry = ASTObjCInterfaces[D]; 663 if (Entry) return *Entry; 664 665 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 666 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 667 ASTRecordLayout *NewEntry = NULL; 668 unsigned FieldCount = D->ivar_size(); 669 if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 670 FieldCount++; 671 const ASTRecordLayout &SL = getASTObjCInterfaceLayout(SD); 672 unsigned Alignment = SL.getAlignment(); 673 uint64_t Size = SL.getSize(); 674 NewEntry = new ASTRecordLayout(Size, Alignment); 675 NewEntry->InitializeLayout(FieldCount); 676 // Super class is at the beginning of the layout. 677 NewEntry->SetFieldOffset(0, 0); 678 } else { 679 NewEntry = new ASTRecordLayout(); 680 NewEntry->InitializeLayout(FieldCount); 681 } 682 Entry = NewEntry; 683 684 unsigned StructPacking = 0; 685 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 686 StructPacking = PA->getAlignment(); 687 688 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 689 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 690 AA->getAlignment())); 691 692 // Layout each ivar sequentially. 693 unsigned i = 0; 694 for (ObjCInterfaceDecl::ivar_iterator IVI = D->ivar_begin(), 695 IVE = D->ivar_end(); IVI != IVE; ++IVI) { 696 const ObjCIvarDecl* Ivar = (*IVI); 697 NewEntry->LayoutField(Ivar, i++, false, StructPacking, *this); 698 } 699 700 // Finally, round the size of the total struct up to the alignment of the 701 // struct itself. 702 NewEntry->FinalizeLayout(); 703 return *NewEntry; 704} 705 706/// getASTRecordLayout - Get or compute information about the layout of the 707/// specified record (struct/union/class), which indicates its size and field 708/// position information. 709const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 710 D = D->getDefinition(*this); 711 assert(D && "Cannot get layout of forward declarations!"); 712 713 // Look up this layout, if already laid out, return what we have. 714 const ASTRecordLayout *&Entry = ASTRecordLayouts[D]; 715 if (Entry) return *Entry; 716 717 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 718 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 719 ASTRecordLayout *NewEntry = new ASTRecordLayout(); 720 Entry = NewEntry; 721 722 // FIXME: Avoid linear walk through the fields, if possible. 723 NewEntry->InitializeLayout(std::distance(D->field_begin(), D->field_end())); 724 bool IsUnion = D->isUnion(); 725 726 unsigned StructPacking = 0; 727 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 728 StructPacking = PA->getAlignment(); 729 730 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 731 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 732 AA->getAlignment())); 733 734 // Layout each field, for now, just sequentially, respecting alignment. In 735 // the future, this will need to be tweakable by targets. 736 unsigned FieldIdx = 0; 737 for (RecordDecl::field_iterator Field = D->field_begin(), 738 FieldEnd = D->field_end(); 739 Field != FieldEnd; (void)++Field, ++FieldIdx) 740 NewEntry->LayoutField(*Field, FieldIdx, IsUnion, StructPacking, *this); 741 742 // Finally, round the size of the total struct up to the alignment of the 743 // struct itself. 744 NewEntry->FinalizeLayout(); 745 return *NewEntry; 746} 747 748//===----------------------------------------------------------------------===// 749// Type creation/memoization methods 750//===----------------------------------------------------------------------===// 751 752QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 753 QualType CanT = getCanonicalType(T); 754 if (CanT.getAddressSpace() == AddressSpace) 755 return T; 756 757 // If we are composing extended qualifiers together, merge together into one 758 // ExtQualType node. 759 unsigned CVRQuals = T.getCVRQualifiers(); 760 QualType::GCAttrTypes GCAttr = QualType::GCNone; 761 Type *TypeNode = T.getTypePtr(); 762 763 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 764 // If this type already has an address space specified, it cannot get 765 // another one. 766 assert(EQT->getAddressSpace() == 0 && 767 "Type cannot be in multiple addr spaces!"); 768 GCAttr = EQT->getObjCGCAttr(); 769 TypeNode = EQT->getBaseType(); 770 } 771 772 // Check if we've already instantiated this type. 773 llvm::FoldingSetNodeID ID; 774 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 775 void *InsertPos = 0; 776 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 777 return QualType(EXTQy, CVRQuals); 778 779 // If the base type isn't canonical, this won't be a canonical type either, 780 // so fill in the canonical type field. 781 QualType Canonical; 782 if (!TypeNode->isCanonical()) { 783 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 784 785 // Update InsertPos, the previous call could have invalidated it. 786 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 787 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 788 } 789 ExtQualType *New = 790 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 791 ExtQualTypes.InsertNode(New, InsertPos); 792 Types.push_back(New); 793 return QualType(New, CVRQuals); 794} 795 796QualType ASTContext::getObjCGCQualType(QualType T, 797 QualType::GCAttrTypes GCAttr) { 798 QualType CanT = getCanonicalType(T); 799 if (CanT.getObjCGCAttr() == GCAttr) 800 return T; 801 802 // If we are composing extended qualifiers together, merge together into one 803 // ExtQualType node. 804 unsigned CVRQuals = T.getCVRQualifiers(); 805 Type *TypeNode = T.getTypePtr(); 806 unsigned AddressSpace = 0; 807 808 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 809 // If this type already has an address space specified, it cannot get 810 // another one. 811 assert(EQT->getObjCGCAttr() == QualType::GCNone && 812 "Type cannot be in multiple addr spaces!"); 813 AddressSpace = EQT->getAddressSpace(); 814 TypeNode = EQT->getBaseType(); 815 } 816 817 // Check if we've already instantiated an gc qual'd type of this type. 818 llvm::FoldingSetNodeID ID; 819 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 820 void *InsertPos = 0; 821 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 822 return QualType(EXTQy, CVRQuals); 823 824 // If the base type isn't canonical, this won't be a canonical type either, 825 // so fill in the canonical type field. 826 // FIXME: Isn't this also not canonical if the base type is a array 827 // or pointer type? I can't find any documentation for objc_gc, though... 828 QualType Canonical; 829 if (!T->isCanonical()) { 830 Canonical = getObjCGCQualType(CanT, GCAttr); 831 832 // Update InsertPos, the previous call could have invalidated it. 833 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 834 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 835 } 836 ExtQualType *New = 837 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 838 ExtQualTypes.InsertNode(New, InsertPos); 839 Types.push_back(New); 840 return QualType(New, CVRQuals); 841} 842 843/// getComplexType - Return the uniqued reference to the type for a complex 844/// number with the specified element type. 845QualType ASTContext::getComplexType(QualType T) { 846 // Unique pointers, to guarantee there is only one pointer of a particular 847 // structure. 848 llvm::FoldingSetNodeID ID; 849 ComplexType::Profile(ID, T); 850 851 void *InsertPos = 0; 852 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 853 return QualType(CT, 0); 854 855 // If the pointee type isn't canonical, this won't be a canonical type either, 856 // so fill in the canonical type field. 857 QualType Canonical; 858 if (!T->isCanonical()) { 859 Canonical = getComplexType(getCanonicalType(T)); 860 861 // Get the new insert position for the node we care about. 862 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 863 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 864 } 865 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 866 Types.push_back(New); 867 ComplexTypes.InsertNode(New, InsertPos); 868 return QualType(New, 0); 869} 870 871QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 872 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 873 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 874 FixedWidthIntType *&Entry = Map[Width]; 875 if (!Entry) 876 Entry = new FixedWidthIntType(Width, Signed); 877 return QualType(Entry, 0); 878} 879 880/// getPointerType - Return the uniqued reference to the type for a pointer to 881/// the specified type. 882QualType ASTContext::getPointerType(QualType T) { 883 // Unique pointers, to guarantee there is only one pointer of a particular 884 // structure. 885 llvm::FoldingSetNodeID ID; 886 PointerType::Profile(ID, T); 887 888 void *InsertPos = 0; 889 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 890 return QualType(PT, 0); 891 892 // If the pointee type isn't canonical, this won't be a canonical type either, 893 // so fill in the canonical type field. 894 QualType Canonical; 895 if (!T->isCanonical()) { 896 Canonical = getPointerType(getCanonicalType(T)); 897 898 // Get the new insert position for the node we care about. 899 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 900 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 901 } 902 PointerType *New = new (*this,8) PointerType(T, Canonical); 903 Types.push_back(New); 904 PointerTypes.InsertNode(New, InsertPos); 905 return QualType(New, 0); 906} 907 908/// getBlockPointerType - Return the uniqued reference to the type for 909/// a pointer to the specified block. 910QualType ASTContext::getBlockPointerType(QualType T) { 911 assert(T->isFunctionType() && "block of function types only"); 912 // Unique pointers, to guarantee there is only one block of a particular 913 // structure. 914 llvm::FoldingSetNodeID ID; 915 BlockPointerType::Profile(ID, T); 916 917 void *InsertPos = 0; 918 if (BlockPointerType *PT = 919 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 920 return QualType(PT, 0); 921 922 // If the block pointee type isn't canonical, this won't be a canonical 923 // type either so fill in the canonical type field. 924 QualType Canonical; 925 if (!T->isCanonical()) { 926 Canonical = getBlockPointerType(getCanonicalType(T)); 927 928 // Get the new insert position for the node we care about. 929 BlockPointerType *NewIP = 930 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 931 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 932 } 933 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 934 Types.push_back(New); 935 BlockPointerTypes.InsertNode(New, InsertPos); 936 return QualType(New, 0); 937} 938 939/// getLValueReferenceType - Return the uniqued reference to the type for an 940/// lvalue reference to the specified type. 941QualType ASTContext::getLValueReferenceType(QualType T) { 942 // Unique pointers, to guarantee there is only one pointer of a particular 943 // structure. 944 llvm::FoldingSetNodeID ID; 945 ReferenceType::Profile(ID, T); 946 947 void *InsertPos = 0; 948 if (LValueReferenceType *RT = 949 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 950 return QualType(RT, 0); 951 952 // If the referencee type isn't canonical, this won't be a canonical type 953 // either, so fill in the canonical type field. 954 QualType Canonical; 955 if (!T->isCanonical()) { 956 Canonical = getLValueReferenceType(getCanonicalType(T)); 957 958 // Get the new insert position for the node we care about. 959 LValueReferenceType *NewIP = 960 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 961 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 962 } 963 964 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 965 Types.push_back(New); 966 LValueReferenceTypes.InsertNode(New, InsertPos); 967 return QualType(New, 0); 968} 969 970/// getRValueReferenceType - Return the uniqued reference to the type for an 971/// rvalue reference to the specified type. 972QualType ASTContext::getRValueReferenceType(QualType T) { 973 // Unique pointers, to guarantee there is only one pointer of a particular 974 // structure. 975 llvm::FoldingSetNodeID ID; 976 ReferenceType::Profile(ID, T); 977 978 void *InsertPos = 0; 979 if (RValueReferenceType *RT = 980 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 981 return QualType(RT, 0); 982 983 // If the referencee type isn't canonical, this won't be a canonical type 984 // either, so fill in the canonical type field. 985 QualType Canonical; 986 if (!T->isCanonical()) { 987 Canonical = getRValueReferenceType(getCanonicalType(T)); 988 989 // Get the new insert position for the node we care about. 990 RValueReferenceType *NewIP = 991 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 992 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 993 } 994 995 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 996 Types.push_back(New); 997 RValueReferenceTypes.InsertNode(New, InsertPos); 998 return QualType(New, 0); 999} 1000 1001/// getMemberPointerType - Return the uniqued reference to the type for a 1002/// member pointer to the specified type, in the specified class. 1003QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1004{ 1005 // Unique pointers, to guarantee there is only one pointer of a particular 1006 // structure. 1007 llvm::FoldingSetNodeID ID; 1008 MemberPointerType::Profile(ID, T, Cls); 1009 1010 void *InsertPos = 0; 1011 if (MemberPointerType *PT = 1012 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1013 return QualType(PT, 0); 1014 1015 // If the pointee or class type isn't canonical, this won't be a canonical 1016 // type either, so fill in the canonical type field. 1017 QualType Canonical; 1018 if (!T->isCanonical()) { 1019 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1020 1021 // Get the new insert position for the node we care about. 1022 MemberPointerType *NewIP = 1023 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1024 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1025 } 1026 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1027 Types.push_back(New); 1028 MemberPointerTypes.InsertNode(New, InsertPos); 1029 return QualType(New, 0); 1030} 1031 1032/// getConstantArrayType - Return the unique reference to the type for an 1033/// array of the specified element type. 1034QualType ASTContext::getConstantArrayType(QualType EltTy, 1035 const llvm::APInt &ArySize, 1036 ArrayType::ArraySizeModifier ASM, 1037 unsigned EltTypeQuals) { 1038 llvm::FoldingSetNodeID ID; 1039 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1040 1041 void *InsertPos = 0; 1042 if (ConstantArrayType *ATP = 1043 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1044 return QualType(ATP, 0); 1045 1046 // If the element type isn't canonical, this won't be a canonical type either, 1047 // so fill in the canonical type field. 1048 QualType Canonical; 1049 if (!EltTy->isCanonical()) { 1050 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1051 ASM, EltTypeQuals); 1052 // Get the new insert position for the node we care about. 1053 ConstantArrayType *NewIP = 1054 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1055 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1056 } 1057 1058 ConstantArrayType *New = 1059 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1060 ConstantArrayTypes.InsertNode(New, InsertPos); 1061 Types.push_back(New); 1062 return QualType(New, 0); 1063} 1064 1065/// getVariableArrayType - Returns a non-unique reference to the type for a 1066/// variable array of the specified element type. 1067QualType ASTContext::getVariableArrayType(QualType EltTy, Expr *NumElts, 1068 ArrayType::ArraySizeModifier ASM, 1069 unsigned EltTypeQuals) { 1070 // Since we don't unique expressions, it isn't possible to unique VLA's 1071 // that have an expression provided for their size. 1072 1073 VariableArrayType *New = 1074 new(*this,8)VariableArrayType(EltTy,QualType(), NumElts, ASM, EltTypeQuals); 1075 1076 VariableArrayTypes.push_back(New); 1077 Types.push_back(New); 1078 return QualType(New, 0); 1079} 1080 1081/// getDependentSizedArrayType - Returns a non-unique reference to 1082/// the type for a dependently-sized array of the specified element 1083/// type. FIXME: We will need these to be uniqued, or at least 1084/// comparable, at some point. 1085QualType ASTContext::getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 1086 ArrayType::ArraySizeModifier ASM, 1087 unsigned EltTypeQuals) { 1088 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1089 "Size must be type- or value-dependent!"); 1090 1091 // Since we don't unique expressions, it isn't possible to unique 1092 // dependently-sized array types. 1093 1094 DependentSizedArrayType *New = 1095 new (*this,8) DependentSizedArrayType(EltTy, QualType(), NumElts, 1096 ASM, EltTypeQuals); 1097 1098 DependentSizedArrayTypes.push_back(New); 1099 Types.push_back(New); 1100 return QualType(New, 0); 1101} 1102 1103QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1104 ArrayType::ArraySizeModifier ASM, 1105 unsigned EltTypeQuals) { 1106 llvm::FoldingSetNodeID ID; 1107 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1108 1109 void *InsertPos = 0; 1110 if (IncompleteArrayType *ATP = 1111 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1112 return QualType(ATP, 0); 1113 1114 // If the element type isn't canonical, this won't be a canonical type 1115 // either, so fill in the canonical type field. 1116 QualType Canonical; 1117 1118 if (!EltTy->isCanonical()) { 1119 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1120 ASM, EltTypeQuals); 1121 1122 // Get the new insert position for the node we care about. 1123 IncompleteArrayType *NewIP = 1124 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1125 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1126 } 1127 1128 IncompleteArrayType *New = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1129 ASM, EltTypeQuals); 1130 1131 IncompleteArrayTypes.InsertNode(New, InsertPos); 1132 Types.push_back(New); 1133 return QualType(New, 0); 1134} 1135 1136/// getVectorType - Return the unique reference to a vector type of 1137/// the specified element type and size. VectorType must be a built-in type. 1138QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1139 BuiltinType *baseType; 1140 1141 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1142 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1143 1144 // Check if we've already instantiated a vector of this type. 1145 llvm::FoldingSetNodeID ID; 1146 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1147 void *InsertPos = 0; 1148 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1149 return QualType(VTP, 0); 1150 1151 // If the element type isn't canonical, this won't be a canonical type either, 1152 // so fill in the canonical type field. 1153 QualType Canonical; 1154 if (!vecType->isCanonical()) { 1155 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1156 1157 // Get the new insert position for the node we care about. 1158 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1159 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1160 } 1161 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1162 VectorTypes.InsertNode(New, InsertPos); 1163 Types.push_back(New); 1164 return QualType(New, 0); 1165} 1166 1167/// getExtVectorType - Return the unique reference to an extended vector type of 1168/// the specified element type and size. VectorType must be a built-in type. 1169QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1170 BuiltinType *baseType; 1171 1172 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1173 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1174 1175 // Check if we've already instantiated a vector of this type. 1176 llvm::FoldingSetNodeID ID; 1177 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1178 void *InsertPos = 0; 1179 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1180 return QualType(VTP, 0); 1181 1182 // If the element type isn't canonical, this won't be a canonical type either, 1183 // so fill in the canonical type field. 1184 QualType Canonical; 1185 if (!vecType->isCanonical()) { 1186 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1187 1188 // Get the new insert position for the node we care about. 1189 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1190 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1191 } 1192 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1193 VectorTypes.InsertNode(New, InsertPos); 1194 Types.push_back(New); 1195 return QualType(New, 0); 1196} 1197 1198/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1199/// 1200QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) { 1201 // Unique functions, to guarantee there is only one function of a particular 1202 // structure. 1203 llvm::FoldingSetNodeID ID; 1204 FunctionNoProtoType::Profile(ID, ResultTy); 1205 1206 void *InsertPos = 0; 1207 if (FunctionNoProtoType *FT = 1208 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1209 return QualType(FT, 0); 1210 1211 QualType Canonical; 1212 if (!ResultTy->isCanonical()) { 1213 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy)); 1214 1215 // Get the new insert position for the node we care about. 1216 FunctionNoProtoType *NewIP = 1217 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1218 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1219 } 1220 1221 FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical); 1222 Types.push_back(New); 1223 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1224 return QualType(New, 0); 1225} 1226 1227/// getFunctionType - Return a normal function type with a typed argument 1228/// list. isVariadic indicates whether the argument list includes '...'. 1229QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1230 unsigned NumArgs, bool isVariadic, 1231 unsigned TypeQuals) { 1232 // Unique functions, to guarantee there is only one function of a particular 1233 // structure. 1234 llvm::FoldingSetNodeID ID; 1235 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1236 TypeQuals); 1237 1238 void *InsertPos = 0; 1239 if (FunctionProtoType *FTP = 1240 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1241 return QualType(FTP, 0); 1242 1243 // Determine whether the type being created is already canonical or not. 1244 bool isCanonical = ResultTy->isCanonical(); 1245 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1246 if (!ArgArray[i]->isCanonical()) 1247 isCanonical = false; 1248 1249 // If this type isn't canonical, get the canonical version of it. 1250 QualType Canonical; 1251 if (!isCanonical) { 1252 llvm::SmallVector<QualType, 16> CanonicalArgs; 1253 CanonicalArgs.reserve(NumArgs); 1254 for (unsigned i = 0; i != NumArgs; ++i) 1255 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1256 1257 Canonical = getFunctionType(getCanonicalType(ResultTy), 1258 &CanonicalArgs[0], NumArgs, 1259 isVariadic, TypeQuals); 1260 1261 // Get the new insert position for the node we care about. 1262 FunctionProtoType *NewIP = 1263 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1264 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1265 } 1266 1267 // FunctionProtoType objects are allocated with extra bytes after them 1268 // for a variable size array (for parameter types) at the end of them. 1269 FunctionProtoType *FTP = 1270 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1271 NumArgs*sizeof(QualType), 8); 1272 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1273 TypeQuals, Canonical); 1274 Types.push_back(FTP); 1275 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1276 return QualType(FTP, 0); 1277} 1278 1279/// getTypeDeclType - Return the unique reference to the type for the 1280/// specified type declaration. 1281QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1282 assert(Decl && "Passed null for Decl param"); 1283 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1284 1285 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1286 return getTypedefType(Typedef); 1287 else if (isa<TemplateTypeParmDecl>(Decl)) { 1288 assert(false && "Template type parameter types are always available."); 1289 } else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1290 return getObjCInterfaceType(ObjCInterface); 1291 1292 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1293 if (PrevDecl) 1294 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1295 else 1296 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1297 } 1298 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1299 if (PrevDecl) 1300 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1301 else 1302 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1303 } 1304 else 1305 assert(false && "TypeDecl without a type?"); 1306 1307 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1308 return QualType(Decl->TypeForDecl, 0); 1309} 1310 1311/// getTypedefType - Return the unique reference to the type for the 1312/// specified typename decl. 1313QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1314 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1315 1316 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1317 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1318 Types.push_back(Decl->TypeForDecl); 1319 return QualType(Decl->TypeForDecl, 0); 1320} 1321 1322/// getObjCInterfaceType - Return the unique reference to the type for the 1323/// specified ObjC interface decl. 1324QualType ASTContext::getObjCInterfaceType(ObjCInterfaceDecl *Decl) { 1325 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1326 1327 Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, Decl); 1328 Types.push_back(Decl->TypeForDecl); 1329 return QualType(Decl->TypeForDecl, 0); 1330} 1331 1332/// buildObjCInterfaceType - Returns a new type for the interface 1333/// declaration, regardless. It also removes any previously built 1334/// record declaration so caller can rebuild it. 1335QualType ASTContext::buildObjCInterfaceType(ObjCInterfaceDecl *Decl) { 1336 const RecordDecl *&RD = ASTRecordForInterface[Decl]; 1337 if (RD) 1338 RD = 0; 1339 Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, Decl); 1340 Types.push_back(Decl->TypeForDecl); 1341 return QualType(Decl->TypeForDecl, 0); 1342} 1343 1344/// \brief Retrieve the template type parameter type for a template 1345/// parameter with the given depth, index, and (optionally) name. 1346QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1347 IdentifierInfo *Name) { 1348 llvm::FoldingSetNodeID ID; 1349 TemplateTypeParmType::Profile(ID, Depth, Index, Name); 1350 void *InsertPos = 0; 1351 TemplateTypeParmType *TypeParm 1352 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1353 1354 if (TypeParm) 1355 return QualType(TypeParm, 0); 1356 1357 if (Name) 1358 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, Name, 1359 getTemplateTypeParmType(Depth, Index)); 1360 else 1361 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index); 1362 1363 Types.push_back(TypeParm); 1364 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1365 1366 return QualType(TypeParm, 0); 1367} 1368 1369QualType 1370ASTContext::getTemplateSpecializationType(TemplateName Template, 1371 const TemplateArgument *Args, 1372 unsigned NumArgs, 1373 QualType Canon) { 1374 if (!Canon.isNull()) 1375 Canon = getCanonicalType(Canon); 1376 1377 llvm::FoldingSetNodeID ID; 1378 TemplateSpecializationType::Profile(ID, Template, Args, NumArgs); 1379 1380 void *InsertPos = 0; 1381 TemplateSpecializationType *Spec 1382 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1383 1384 if (Spec) 1385 return QualType(Spec, 0); 1386 1387 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1388 sizeof(TemplateArgument) * NumArgs), 1389 8); 1390 Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon); 1391 Types.push_back(Spec); 1392 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1393 1394 return QualType(Spec, 0); 1395} 1396 1397QualType 1398ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1399 QualType NamedType) { 1400 llvm::FoldingSetNodeID ID; 1401 QualifiedNameType::Profile(ID, NNS, NamedType); 1402 1403 void *InsertPos = 0; 1404 QualifiedNameType *T 1405 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1406 if (T) 1407 return QualType(T, 0); 1408 1409 T = new (*this) QualifiedNameType(NNS, NamedType, 1410 getCanonicalType(NamedType)); 1411 Types.push_back(T); 1412 QualifiedNameTypes.InsertNode(T, InsertPos); 1413 return QualType(T, 0); 1414} 1415 1416QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1417 const IdentifierInfo *Name, 1418 QualType Canon) { 1419 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1420 1421 if (Canon.isNull()) { 1422 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1423 if (CanonNNS != NNS) 1424 Canon = getTypenameType(CanonNNS, Name); 1425 } 1426 1427 llvm::FoldingSetNodeID ID; 1428 TypenameType::Profile(ID, NNS, Name); 1429 1430 void *InsertPos = 0; 1431 TypenameType *T 1432 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1433 if (T) 1434 return QualType(T, 0); 1435 1436 T = new (*this) TypenameType(NNS, Name, Canon); 1437 Types.push_back(T); 1438 TypenameTypes.InsertNode(T, InsertPos); 1439 return QualType(T, 0); 1440} 1441 1442/// CmpProtocolNames - Comparison predicate for sorting protocols 1443/// alphabetically. 1444static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1445 const ObjCProtocolDecl *RHS) { 1446 return LHS->getDeclName() < RHS->getDeclName(); 1447} 1448 1449static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1450 unsigned &NumProtocols) { 1451 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1452 1453 // Sort protocols, keyed by name. 1454 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1455 1456 // Remove duplicates. 1457 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1458 NumProtocols = ProtocolsEnd-Protocols; 1459} 1460 1461 1462/// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for 1463/// the given interface decl and the conforming protocol list. 1464QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 1465 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1466 // Sort the protocol list alphabetically to canonicalize it. 1467 SortAndUniqueProtocols(Protocols, NumProtocols); 1468 1469 llvm::FoldingSetNodeID ID; 1470 ObjCQualifiedInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1471 1472 void *InsertPos = 0; 1473 if (ObjCQualifiedInterfaceType *QT = 1474 ObjCQualifiedInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1475 return QualType(QT, 0); 1476 1477 // No Match; 1478 ObjCQualifiedInterfaceType *QType = 1479 new (*this,8) ObjCQualifiedInterfaceType(Decl, Protocols, NumProtocols); 1480 1481 Types.push_back(QType); 1482 ObjCQualifiedInterfaceTypes.InsertNode(QType, InsertPos); 1483 return QualType(QType, 0); 1484} 1485 1486/// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for the 'id' decl 1487/// and the conforming protocol list. 1488QualType ASTContext::getObjCQualifiedIdType(ObjCProtocolDecl **Protocols, 1489 unsigned NumProtocols) { 1490 // Sort the protocol list alphabetically to canonicalize it. 1491 SortAndUniqueProtocols(Protocols, NumProtocols); 1492 1493 llvm::FoldingSetNodeID ID; 1494 ObjCQualifiedIdType::Profile(ID, Protocols, NumProtocols); 1495 1496 void *InsertPos = 0; 1497 if (ObjCQualifiedIdType *QT = 1498 ObjCQualifiedIdTypes.FindNodeOrInsertPos(ID, InsertPos)) 1499 return QualType(QT, 0); 1500 1501 // No Match; 1502 ObjCQualifiedIdType *QType = 1503 new (*this,8) ObjCQualifiedIdType(Protocols, NumProtocols); 1504 Types.push_back(QType); 1505 ObjCQualifiedIdTypes.InsertNode(QType, InsertPos); 1506 return QualType(QType, 0); 1507} 1508 1509/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1510/// TypeOfExprType AST's (since expression's are never shared). For example, 1511/// multiple declarations that refer to "typeof(x)" all contain different 1512/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1513/// on canonical type's (which are always unique). 1514QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1515 QualType Canonical = getCanonicalType(tofExpr->getType()); 1516 TypeOfExprType *toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1517 Types.push_back(toe); 1518 return QualType(toe, 0); 1519} 1520 1521/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1522/// TypeOfType AST's. The only motivation to unique these nodes would be 1523/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1524/// an issue. This doesn't effect the type checker, since it operates 1525/// on canonical type's (which are always unique). 1526QualType ASTContext::getTypeOfType(QualType tofType) { 1527 QualType Canonical = getCanonicalType(tofType); 1528 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1529 Types.push_back(tot); 1530 return QualType(tot, 0); 1531} 1532 1533/// getTagDeclType - Return the unique reference to the type for the 1534/// specified TagDecl (struct/union/class/enum) decl. 1535QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1536 assert (Decl); 1537 return getTypeDeclType(Decl); 1538} 1539 1540/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1541/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1542/// needs to agree with the definition in <stddef.h>. 1543QualType ASTContext::getSizeType() const { 1544 return getFromTargetType(Target.getSizeType()); 1545} 1546 1547/// getSignedWCharType - Return the type of "signed wchar_t". 1548/// Used when in C++, as a GCC extension. 1549QualType ASTContext::getSignedWCharType() const { 1550 // FIXME: derive from "Target" ? 1551 return WCharTy; 1552} 1553 1554/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1555/// Used when in C++, as a GCC extension. 1556QualType ASTContext::getUnsignedWCharType() const { 1557 // FIXME: derive from "Target" ? 1558 return UnsignedIntTy; 1559} 1560 1561/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 1562/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 1563QualType ASTContext::getPointerDiffType() const { 1564 return getFromTargetType(Target.getPtrDiffType(0)); 1565} 1566 1567//===----------------------------------------------------------------------===// 1568// Type Operators 1569//===----------------------------------------------------------------------===// 1570 1571/// getCanonicalType - Return the canonical (structural) type corresponding to 1572/// the specified potentially non-canonical type. The non-canonical version 1573/// of a type may have many "decorated" versions of types. Decorators can 1574/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 1575/// to be free of any of these, allowing two canonical types to be compared 1576/// for exact equality with a simple pointer comparison. 1577QualType ASTContext::getCanonicalType(QualType T) { 1578 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 1579 1580 // If the result has type qualifiers, make sure to canonicalize them as well. 1581 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 1582 if (TypeQuals == 0) return CanType; 1583 1584 // If the type qualifiers are on an array type, get the canonical type of the 1585 // array with the qualifiers applied to the element type. 1586 ArrayType *AT = dyn_cast<ArrayType>(CanType); 1587 if (!AT) 1588 return CanType.getQualifiedType(TypeQuals); 1589 1590 // Get the canonical version of the element with the extra qualifiers on it. 1591 // This can recursively sink qualifiers through multiple levels of arrays. 1592 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 1593 NewEltTy = getCanonicalType(NewEltTy); 1594 1595 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1596 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 1597 CAT->getIndexTypeQualifier()); 1598 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 1599 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 1600 IAT->getIndexTypeQualifier()); 1601 1602 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 1603 return getDependentSizedArrayType(NewEltTy, DSAT->getSizeExpr(), 1604 DSAT->getSizeModifier(), 1605 DSAT->getIndexTypeQualifier()); 1606 1607 VariableArrayType *VAT = cast<VariableArrayType>(AT); 1608 return getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1609 VAT->getSizeModifier(), 1610 VAT->getIndexTypeQualifier()); 1611} 1612 1613NestedNameSpecifier * 1614ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 1615 if (!NNS) 1616 return 0; 1617 1618 switch (NNS->getKind()) { 1619 case NestedNameSpecifier::Identifier: 1620 // Canonicalize the prefix but keep the identifier the same. 1621 return NestedNameSpecifier::Create(*this, 1622 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 1623 NNS->getAsIdentifier()); 1624 1625 case NestedNameSpecifier::Namespace: 1626 // A namespace is canonical; build a nested-name-specifier with 1627 // this namespace and no prefix. 1628 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 1629 1630 case NestedNameSpecifier::TypeSpec: 1631 case NestedNameSpecifier::TypeSpecWithTemplate: { 1632 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 1633 NestedNameSpecifier *Prefix = 0; 1634 1635 // FIXME: This isn't the right check! 1636 if (T->isDependentType()) 1637 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 1638 1639 return NestedNameSpecifier::Create(*this, Prefix, 1640 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 1641 T.getTypePtr()); 1642 } 1643 1644 case NestedNameSpecifier::Global: 1645 // The global specifier is canonical and unique. 1646 return NNS; 1647 } 1648 1649 // Required to silence a GCC warning 1650 return 0; 1651} 1652 1653 1654const ArrayType *ASTContext::getAsArrayType(QualType T) { 1655 // Handle the non-qualified case efficiently. 1656 if (T.getCVRQualifiers() == 0) { 1657 // Handle the common positive case fast. 1658 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 1659 return AT; 1660 } 1661 1662 // Handle the common negative case fast, ignoring CVR qualifiers. 1663 QualType CType = T->getCanonicalTypeInternal(); 1664 1665 // Make sure to look through type qualifiers (like ExtQuals) for the negative 1666 // test. 1667 if (!isa<ArrayType>(CType) && 1668 !isa<ArrayType>(CType.getUnqualifiedType())) 1669 return 0; 1670 1671 // Apply any CVR qualifiers from the array type to the element type. This 1672 // implements C99 6.7.3p8: "If the specification of an array type includes 1673 // any type qualifiers, the element type is so qualified, not the array type." 1674 1675 // If we get here, we either have type qualifiers on the type, or we have 1676 // sugar such as a typedef in the way. If we have type qualifiers on the type 1677 // we must propagate them down into the elemeng type. 1678 unsigned CVRQuals = T.getCVRQualifiers(); 1679 unsigned AddrSpace = 0; 1680 Type *Ty = T.getTypePtr(); 1681 1682 // Rip through ExtQualType's and typedefs to get to a concrete type. 1683 while (1) { 1684 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 1685 AddrSpace = EXTQT->getAddressSpace(); 1686 Ty = EXTQT->getBaseType(); 1687 } else { 1688 T = Ty->getDesugaredType(); 1689 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 1690 break; 1691 CVRQuals |= T.getCVRQualifiers(); 1692 Ty = T.getTypePtr(); 1693 } 1694 } 1695 1696 // If we have a simple case, just return now. 1697 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 1698 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 1699 return ATy; 1700 1701 // Otherwise, we have an array and we have qualifiers on it. Push the 1702 // qualifiers into the array element type and return a new array type. 1703 // Get the canonical version of the element with the extra qualifiers on it. 1704 // This can recursively sink qualifiers through multiple levels of arrays. 1705 QualType NewEltTy = ATy->getElementType(); 1706 if (AddrSpace) 1707 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 1708 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 1709 1710 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 1711 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 1712 CAT->getSizeModifier(), 1713 CAT->getIndexTypeQualifier())); 1714 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 1715 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 1716 IAT->getSizeModifier(), 1717 IAT->getIndexTypeQualifier())); 1718 1719 if (const DependentSizedArrayType *DSAT 1720 = dyn_cast<DependentSizedArrayType>(ATy)) 1721 return cast<ArrayType>( 1722 getDependentSizedArrayType(NewEltTy, 1723 DSAT->getSizeExpr(), 1724 DSAT->getSizeModifier(), 1725 DSAT->getIndexTypeQualifier())); 1726 1727 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 1728 return cast<ArrayType>(getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1729 VAT->getSizeModifier(), 1730 VAT->getIndexTypeQualifier())); 1731} 1732 1733 1734/// getArrayDecayedType - Return the properly qualified result of decaying the 1735/// specified array type to a pointer. This operation is non-trivial when 1736/// handling typedefs etc. The canonical type of "T" must be an array type, 1737/// this returns a pointer to a properly qualified element of the array. 1738/// 1739/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 1740QualType ASTContext::getArrayDecayedType(QualType Ty) { 1741 // Get the element type with 'getAsArrayType' so that we don't lose any 1742 // typedefs in the element type of the array. This also handles propagation 1743 // of type qualifiers from the array type into the element type if present 1744 // (C99 6.7.3p8). 1745 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 1746 assert(PrettyArrayType && "Not an array type!"); 1747 1748 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 1749 1750 // int x[restrict 4] -> int *restrict 1751 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 1752} 1753 1754QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 1755 QualType ElemTy = VAT->getElementType(); 1756 1757 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 1758 return getBaseElementType(VAT); 1759 1760 return ElemTy; 1761} 1762 1763/// getFloatingRank - Return a relative rank for floating point types. 1764/// This routine will assert if passed a built-in type that isn't a float. 1765static FloatingRank getFloatingRank(QualType T) { 1766 if (const ComplexType *CT = T->getAsComplexType()) 1767 return getFloatingRank(CT->getElementType()); 1768 1769 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 1770 switch (T->getAsBuiltinType()->getKind()) { 1771 default: assert(0 && "getFloatingRank(): not a floating type"); 1772 case BuiltinType::Float: return FloatRank; 1773 case BuiltinType::Double: return DoubleRank; 1774 case BuiltinType::LongDouble: return LongDoubleRank; 1775 } 1776} 1777 1778/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 1779/// point or a complex type (based on typeDomain/typeSize). 1780/// 'typeDomain' is a real floating point or complex type. 1781/// 'typeSize' is a real floating point or complex type. 1782QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 1783 QualType Domain) const { 1784 FloatingRank EltRank = getFloatingRank(Size); 1785 if (Domain->isComplexType()) { 1786 switch (EltRank) { 1787 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1788 case FloatRank: return FloatComplexTy; 1789 case DoubleRank: return DoubleComplexTy; 1790 case LongDoubleRank: return LongDoubleComplexTy; 1791 } 1792 } 1793 1794 assert(Domain->isRealFloatingType() && "Unknown domain!"); 1795 switch (EltRank) { 1796 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1797 case FloatRank: return FloatTy; 1798 case DoubleRank: return DoubleTy; 1799 case LongDoubleRank: return LongDoubleTy; 1800 } 1801} 1802 1803/// getFloatingTypeOrder - Compare the rank of the two specified floating 1804/// point types, ignoring the domain of the type (i.e. 'double' == 1805/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 1806/// LHS < RHS, return -1. 1807int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 1808 FloatingRank LHSR = getFloatingRank(LHS); 1809 FloatingRank RHSR = getFloatingRank(RHS); 1810 1811 if (LHSR == RHSR) 1812 return 0; 1813 if (LHSR > RHSR) 1814 return 1; 1815 return -1; 1816} 1817 1818/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 1819/// routine will assert if passed a built-in type that isn't an integer or enum, 1820/// or if it is not canonicalized. 1821unsigned ASTContext::getIntegerRank(Type *T) { 1822 assert(T->isCanonical() && "T should be canonicalized"); 1823 if (EnumType* ET = dyn_cast<EnumType>(T)) 1824 T = ET->getDecl()->getIntegerType().getTypePtr(); 1825 1826 // There are two things which impact the integer rank: the width, and 1827 // the ordering of builtins. The builtin ordering is encoded in the 1828 // bottom three bits; the width is encoded in the bits above that. 1829 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 1830 return FWIT->getWidth() << 3; 1831 } 1832 1833 switch (cast<BuiltinType>(T)->getKind()) { 1834 default: assert(0 && "getIntegerRank(): not a built-in integer"); 1835 case BuiltinType::Bool: 1836 return 1 + (getIntWidth(BoolTy) << 3); 1837 case BuiltinType::Char_S: 1838 case BuiltinType::Char_U: 1839 case BuiltinType::SChar: 1840 case BuiltinType::UChar: 1841 return 2 + (getIntWidth(CharTy) << 3); 1842 case BuiltinType::Short: 1843 case BuiltinType::UShort: 1844 return 3 + (getIntWidth(ShortTy) << 3); 1845 case BuiltinType::Int: 1846 case BuiltinType::UInt: 1847 return 4 + (getIntWidth(IntTy) << 3); 1848 case BuiltinType::Long: 1849 case BuiltinType::ULong: 1850 return 5 + (getIntWidth(LongTy) << 3); 1851 case BuiltinType::LongLong: 1852 case BuiltinType::ULongLong: 1853 return 6 + (getIntWidth(LongLongTy) << 3); 1854 } 1855} 1856 1857/// getIntegerTypeOrder - Returns the highest ranked integer type: 1858/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 1859/// LHS < RHS, return -1. 1860int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 1861 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 1862 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 1863 if (LHSC == RHSC) return 0; 1864 1865 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 1866 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 1867 1868 unsigned LHSRank = getIntegerRank(LHSC); 1869 unsigned RHSRank = getIntegerRank(RHSC); 1870 1871 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 1872 if (LHSRank == RHSRank) return 0; 1873 return LHSRank > RHSRank ? 1 : -1; 1874 } 1875 1876 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 1877 if (LHSUnsigned) { 1878 // If the unsigned [LHS] type is larger, return it. 1879 if (LHSRank >= RHSRank) 1880 return 1; 1881 1882 // If the signed type can represent all values of the unsigned type, it 1883 // wins. Because we are dealing with 2's complement and types that are 1884 // powers of two larger than each other, this is always safe. 1885 return -1; 1886 } 1887 1888 // If the unsigned [RHS] type is larger, return it. 1889 if (RHSRank >= LHSRank) 1890 return -1; 1891 1892 // If the signed type can represent all values of the unsigned type, it 1893 // wins. Because we are dealing with 2's complement and types that are 1894 // powers of two larger than each other, this is always safe. 1895 return 1; 1896} 1897 1898// getCFConstantStringType - Return the type used for constant CFStrings. 1899QualType ASTContext::getCFConstantStringType() { 1900 if (!CFConstantStringTypeDecl) { 1901 CFConstantStringTypeDecl = 1902 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 1903 &Idents.get("NSConstantString")); 1904 QualType FieldTypes[4]; 1905 1906 // const int *isa; 1907 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 1908 // int flags; 1909 FieldTypes[1] = IntTy; 1910 // const char *str; 1911 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 1912 // long length; 1913 FieldTypes[3] = LongTy; 1914 1915 // Create fields 1916 for (unsigned i = 0; i < 4; ++i) { 1917 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 1918 SourceLocation(), 0, 1919 FieldTypes[i], /*BitWidth=*/0, 1920 /*Mutable=*/false); 1921 CFConstantStringTypeDecl->addDecl(Field); 1922 } 1923 1924 CFConstantStringTypeDecl->completeDefinition(*this); 1925 } 1926 1927 return getTagDeclType(CFConstantStringTypeDecl); 1928} 1929 1930QualType ASTContext::getObjCFastEnumerationStateType() 1931{ 1932 if (!ObjCFastEnumerationStateTypeDecl) { 1933 ObjCFastEnumerationStateTypeDecl = 1934 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 1935 &Idents.get("__objcFastEnumerationState")); 1936 1937 QualType FieldTypes[] = { 1938 UnsignedLongTy, 1939 getPointerType(ObjCIdType), 1940 getPointerType(UnsignedLongTy), 1941 getConstantArrayType(UnsignedLongTy, 1942 llvm::APInt(32, 5), ArrayType::Normal, 0) 1943 }; 1944 1945 for (size_t i = 0; i < 4; ++i) { 1946 FieldDecl *Field = FieldDecl::Create(*this, 1947 ObjCFastEnumerationStateTypeDecl, 1948 SourceLocation(), 0, 1949 FieldTypes[i], /*BitWidth=*/0, 1950 /*Mutable=*/false); 1951 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 1952 } 1953 1954 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 1955 } 1956 1957 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 1958} 1959 1960// This returns true if a type has been typedefed to BOOL: 1961// typedef <type> BOOL; 1962static bool isTypeTypedefedAsBOOL(QualType T) { 1963 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 1964 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 1965 return II->isStr("BOOL"); 1966 1967 return false; 1968} 1969 1970/// getObjCEncodingTypeSize returns size of type for objective-c encoding 1971/// purpose. 1972int ASTContext::getObjCEncodingTypeSize(QualType type) { 1973 uint64_t sz = getTypeSize(type); 1974 1975 // Make all integer and enum types at least as large as an int 1976 if (sz > 0 && type->isIntegralType()) 1977 sz = std::max(sz, getTypeSize(IntTy)); 1978 // Treat arrays as pointers, since that's how they're passed in. 1979 else if (type->isArrayType()) 1980 sz = getTypeSize(VoidPtrTy); 1981 return sz / getTypeSize(CharTy); 1982} 1983 1984/// getObjCEncodingForMethodDecl - Return the encoded type for this method 1985/// declaration. 1986void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 1987 std::string& S) { 1988 // FIXME: This is not very efficient. 1989 // Encode type qualifer, 'in', 'inout', etc. for the return type. 1990 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 1991 // Encode result type. 1992 getObjCEncodingForType(Decl->getResultType(), S); 1993 // Compute size of all parameters. 1994 // Start with computing size of a pointer in number of bytes. 1995 // FIXME: There might(should) be a better way of doing this computation! 1996 SourceLocation Loc; 1997 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 1998 // The first two arguments (self and _cmd) are pointers; account for 1999 // their size. 2000 int ParmOffset = 2 * PtrSize; 2001 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2002 E = Decl->param_end(); PI != E; ++PI) { 2003 QualType PType = (*PI)->getType(); 2004 int sz = getObjCEncodingTypeSize(PType); 2005 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2006 ParmOffset += sz; 2007 } 2008 S += llvm::utostr(ParmOffset); 2009 S += "@0:"; 2010 S += llvm::utostr(PtrSize); 2011 2012 // Argument types. 2013 ParmOffset = 2 * PtrSize; 2014 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2015 E = Decl->param_end(); PI != E; ++PI) { 2016 ParmVarDecl *PVDecl = *PI; 2017 QualType PType = PVDecl->getOriginalType(); 2018 if (const ArrayType *AT = 2019 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) 2020 // Use array's original type only if it has known number of 2021 // elements. 2022 if (!dyn_cast<ConstantArrayType>(AT)) 2023 PType = PVDecl->getType(); 2024 // Process argument qualifiers for user supplied arguments; such as, 2025 // 'in', 'inout', etc. 2026 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2027 getObjCEncodingForType(PType, S); 2028 S += llvm::utostr(ParmOffset); 2029 ParmOffset += getObjCEncodingTypeSize(PType); 2030 } 2031} 2032 2033/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2034/// property declaration. If non-NULL, Container must be either an 2035/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2036/// NULL when getting encodings for protocol properties. 2037/// Property attributes are stored as a comma-delimited C string. The simple 2038/// attributes readonly and bycopy are encoded as single characters. The 2039/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2040/// encoded as single characters, followed by an identifier. Property types 2041/// are also encoded as a parametrized attribute. The characters used to encode 2042/// these attributes are defined by the following enumeration: 2043/// @code 2044/// enum PropertyAttributes { 2045/// kPropertyReadOnly = 'R', // property is read-only. 2046/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2047/// kPropertyByref = '&', // property is a reference to the value last assigned 2048/// kPropertyDynamic = 'D', // property is dynamic 2049/// kPropertyGetter = 'G', // followed by getter selector name 2050/// kPropertySetter = 'S', // followed by setter selector name 2051/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2052/// kPropertyType = 't' // followed by old-style type encoding. 2053/// kPropertyWeak = 'W' // 'weak' property 2054/// kPropertyStrong = 'P' // property GC'able 2055/// kPropertyNonAtomic = 'N' // property non-atomic 2056/// }; 2057/// @endcode 2058void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2059 const Decl *Container, 2060 std::string& S) { 2061 // Collect information from the property implementation decl(s). 2062 bool Dynamic = false; 2063 ObjCPropertyImplDecl *SynthesizePID = 0; 2064 2065 // FIXME: Duplicated code due to poor abstraction. 2066 if (Container) { 2067 if (const ObjCCategoryImplDecl *CID = 2068 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2069 for (ObjCCategoryImplDecl::propimpl_iterator 2070 i = CID->propimpl_begin(), e = CID->propimpl_end(); i != e; ++i) { 2071 ObjCPropertyImplDecl *PID = *i; 2072 if (PID->getPropertyDecl() == PD) { 2073 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2074 Dynamic = true; 2075 } else { 2076 SynthesizePID = PID; 2077 } 2078 } 2079 } 2080 } else { 2081 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2082 for (ObjCCategoryImplDecl::propimpl_iterator 2083 i = OID->propimpl_begin(), e = OID->propimpl_end(); i != e; ++i) { 2084 ObjCPropertyImplDecl *PID = *i; 2085 if (PID->getPropertyDecl() == PD) { 2086 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2087 Dynamic = true; 2088 } else { 2089 SynthesizePID = PID; 2090 } 2091 } 2092 } 2093 } 2094 } 2095 2096 // FIXME: This is not very efficient. 2097 S = "T"; 2098 2099 // Encode result type. 2100 // GCC has some special rules regarding encoding of properties which 2101 // closely resembles encoding of ivars. 2102 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, NULL, 2103 true /* outermost type */, 2104 true /* encoding for property */); 2105 2106 if (PD->isReadOnly()) { 2107 S += ",R"; 2108 } else { 2109 switch (PD->getSetterKind()) { 2110 case ObjCPropertyDecl::Assign: break; 2111 case ObjCPropertyDecl::Copy: S += ",C"; break; 2112 case ObjCPropertyDecl::Retain: S += ",&"; break; 2113 } 2114 } 2115 2116 // It really isn't clear at all what this means, since properties 2117 // are "dynamic by default". 2118 if (Dynamic) 2119 S += ",D"; 2120 2121 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2122 S += ",N"; 2123 2124 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2125 S += ",G"; 2126 S += PD->getGetterName().getAsString(); 2127 } 2128 2129 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2130 S += ",S"; 2131 S += PD->getSetterName().getAsString(); 2132 } 2133 2134 if (SynthesizePID) { 2135 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2136 S += ",V"; 2137 S += OID->getNameAsString(); 2138 } 2139 2140 // FIXME: OBJCGC: weak & strong 2141} 2142 2143/// getLegacyIntegralTypeEncoding - 2144/// Another legacy compatibility encoding: 32-bit longs are encoded as 2145/// 'l' or 'L' , but not always. For typedefs, we need to use 2146/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2147/// 2148void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2149 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 2150 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2151 if (BT->getKind() == BuiltinType::ULong && 2152 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2153 PointeeTy = UnsignedIntTy; 2154 else 2155 if (BT->getKind() == BuiltinType::Long && 2156 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2157 PointeeTy = IntTy; 2158 } 2159 } 2160} 2161 2162void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2163 FieldDecl *Field) const { 2164 // We follow the behavior of gcc, expanding structures which are 2165 // directly pointed to, and expanding embedded structures. Note that 2166 // these rules are sufficient to prevent recursive encoding of the 2167 // same type. 2168 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2169 true /* outermost type */); 2170} 2171 2172static void EncodeBitField(const ASTContext *Context, std::string& S, 2173 FieldDecl *FD) { 2174 const Expr *E = FD->getBitWidth(); 2175 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2176 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2177 unsigned N = E->getIntegerConstantExprValue(*Ctx).getZExtValue(); 2178 S += 'b'; 2179 S += llvm::utostr(N); 2180} 2181 2182void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2183 bool ExpandPointedToStructures, 2184 bool ExpandStructures, 2185 FieldDecl *FD, 2186 bool OutermostType, 2187 bool EncodingProperty) const { 2188 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2189 if (FD && FD->isBitField()) { 2190 EncodeBitField(this, S, FD); 2191 } 2192 else { 2193 char encoding; 2194 switch (BT->getKind()) { 2195 default: assert(0 && "Unhandled builtin type kind"); 2196 case BuiltinType::Void: encoding = 'v'; break; 2197 case BuiltinType::Bool: encoding = 'B'; break; 2198 case BuiltinType::Char_U: 2199 case BuiltinType::UChar: encoding = 'C'; break; 2200 case BuiltinType::UShort: encoding = 'S'; break; 2201 case BuiltinType::UInt: encoding = 'I'; break; 2202 case BuiltinType::ULong: 2203 encoding = 2204 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2205 break; 2206 case BuiltinType::ULongLong: encoding = 'Q'; break; 2207 case BuiltinType::Char_S: 2208 case BuiltinType::SChar: encoding = 'c'; break; 2209 case BuiltinType::Short: encoding = 's'; break; 2210 case BuiltinType::Int: encoding = 'i'; break; 2211 case BuiltinType::Long: 2212 encoding = 2213 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2214 break; 2215 case BuiltinType::LongLong: encoding = 'q'; break; 2216 case BuiltinType::Float: encoding = 'f'; break; 2217 case BuiltinType::Double: encoding = 'd'; break; 2218 case BuiltinType::LongDouble: encoding = 'd'; break; 2219 } 2220 2221 S += encoding; 2222 } 2223 } 2224 else if (T->isObjCQualifiedIdType()) { 2225 getObjCEncodingForTypeImpl(getObjCIdType(), S, 2226 ExpandPointedToStructures, 2227 ExpandStructures, FD); 2228 if (FD || EncodingProperty) { 2229 // Note that we do extended encoding of protocol qualifer list 2230 // Only when doing ivar or property encoding. 2231 const ObjCQualifiedIdType *QIDT = T->getAsObjCQualifiedIdType(); 2232 S += '"'; 2233 for (unsigned i =0; i < QIDT->getNumProtocols(); i++) { 2234 ObjCProtocolDecl *Proto = QIDT->getProtocols(i); 2235 S += '<'; 2236 S += Proto->getNameAsString(); 2237 S += '>'; 2238 } 2239 S += '"'; 2240 } 2241 return; 2242 } 2243 else if (const PointerType *PT = T->getAsPointerType()) { 2244 QualType PointeeTy = PT->getPointeeType(); 2245 bool isReadOnly = false; 2246 // For historical/compatibility reasons, the read-only qualifier of the 2247 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2248 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2249 // Also, do not emit the 'r' for anything but the outermost type! 2250 if (dyn_cast<TypedefType>(T.getTypePtr())) { 2251 if (OutermostType && T.isConstQualified()) { 2252 isReadOnly = true; 2253 S += 'r'; 2254 } 2255 } 2256 else if (OutermostType) { 2257 QualType P = PointeeTy; 2258 while (P->getAsPointerType()) 2259 P = P->getAsPointerType()->getPointeeType(); 2260 if (P.isConstQualified()) { 2261 isReadOnly = true; 2262 S += 'r'; 2263 } 2264 } 2265 if (isReadOnly) { 2266 // Another legacy compatibility encoding. Some ObjC qualifier and type 2267 // combinations need to be rearranged. 2268 // Rewrite "in const" from "nr" to "rn" 2269 const char * s = S.c_str(); 2270 int len = S.length(); 2271 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2272 std::string replace = "rn"; 2273 S.replace(S.end()-2, S.end(), replace); 2274 } 2275 } 2276 if (isObjCIdStructType(PointeeTy)) { 2277 S += '@'; 2278 return; 2279 } 2280 else if (PointeeTy->isObjCInterfaceType()) { 2281 if (!EncodingProperty && 2282 isa<TypedefType>(PointeeTy.getTypePtr())) { 2283 // Another historical/compatibility reason. 2284 // We encode the underlying type which comes out as 2285 // {...}; 2286 S += '^'; 2287 getObjCEncodingForTypeImpl(PointeeTy, S, 2288 false, ExpandPointedToStructures, 2289 NULL); 2290 return; 2291 } 2292 S += '@'; 2293 if (FD || EncodingProperty) { 2294 const ObjCInterfaceType *OIT = 2295 PointeeTy.getUnqualifiedType()->getAsObjCInterfaceType(); 2296 ObjCInterfaceDecl *OI = OIT->getDecl(); 2297 S += '"'; 2298 S += OI->getNameAsCString(); 2299 for (unsigned i =0; i < OIT->getNumProtocols(); i++) { 2300 ObjCProtocolDecl *Proto = OIT->getProtocol(i); 2301 S += '<'; 2302 S += Proto->getNameAsString(); 2303 S += '>'; 2304 } 2305 S += '"'; 2306 } 2307 return; 2308 } else if (isObjCClassStructType(PointeeTy)) { 2309 S += '#'; 2310 return; 2311 } else if (isObjCSelType(PointeeTy)) { 2312 S += ':'; 2313 return; 2314 } 2315 2316 if (PointeeTy->isCharType()) { 2317 // char pointer types should be encoded as '*' unless it is a 2318 // type that has been typedef'd to 'BOOL'. 2319 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2320 S += '*'; 2321 return; 2322 } 2323 } 2324 2325 S += '^'; 2326 getLegacyIntegralTypeEncoding(PointeeTy); 2327 2328 getObjCEncodingForTypeImpl(PointeeTy, S, 2329 false, ExpandPointedToStructures, 2330 NULL); 2331 } else if (const ArrayType *AT = 2332 // Ignore type qualifiers etc. 2333 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2334 if (isa<IncompleteArrayType>(AT)) { 2335 // Incomplete arrays are encoded as a pointer to the array element. 2336 S += '^'; 2337 2338 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2339 false, ExpandStructures, FD); 2340 } else { 2341 S += '['; 2342 2343 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2344 S += llvm::utostr(CAT->getSize().getZExtValue()); 2345 else { 2346 //Variable length arrays are encoded as a regular array with 0 elements. 2347 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2348 S += '0'; 2349 } 2350 2351 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2352 false, ExpandStructures, FD); 2353 S += ']'; 2354 } 2355 } else if (T->getAsFunctionType()) { 2356 S += '?'; 2357 } else if (const RecordType *RTy = T->getAsRecordType()) { 2358 RecordDecl *RDecl = RTy->getDecl(); 2359 S += RDecl->isUnion() ? '(' : '{'; 2360 // Anonymous structures print as '?' 2361 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2362 S += II->getName(); 2363 } else { 2364 S += '?'; 2365 } 2366 if (ExpandStructures) { 2367 S += '='; 2368 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 2369 FieldEnd = RDecl->field_end(); 2370 Field != FieldEnd; ++Field) { 2371 if (FD) { 2372 S += '"'; 2373 S += Field->getNameAsString(); 2374 S += '"'; 2375 } 2376 2377 // Special case bit-fields. 2378 if (Field->isBitField()) { 2379 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2380 (*Field)); 2381 } else { 2382 QualType qt = Field->getType(); 2383 getLegacyIntegralTypeEncoding(qt); 2384 getObjCEncodingForTypeImpl(qt, S, false, true, 2385 FD); 2386 } 2387 } 2388 } 2389 S += RDecl->isUnion() ? ')' : '}'; 2390 } else if (T->isEnumeralType()) { 2391 if (FD && FD->isBitField()) 2392 EncodeBitField(this, S, FD); 2393 else 2394 S += 'i'; 2395 } else if (T->isBlockPointerType()) { 2396 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2397 } else if (T->isObjCInterfaceType()) { 2398 // @encode(class_name) 2399 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2400 S += '{'; 2401 const IdentifierInfo *II = OI->getIdentifier(); 2402 S += II->getName(); 2403 S += '='; 2404 std::vector<FieldDecl*> RecFields; 2405 CollectObjCIvars(OI, RecFields); 2406 for (unsigned int i = 0; i != RecFields.size(); i++) { 2407 if (RecFields[i]->isBitField()) 2408 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2409 RecFields[i]); 2410 else 2411 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2412 FD); 2413 } 2414 S += '}'; 2415 } 2416 else 2417 assert(0 && "@encode for type not implemented!"); 2418} 2419 2420void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2421 std::string& S) const { 2422 if (QT & Decl::OBJC_TQ_In) 2423 S += 'n'; 2424 if (QT & Decl::OBJC_TQ_Inout) 2425 S += 'N'; 2426 if (QT & Decl::OBJC_TQ_Out) 2427 S += 'o'; 2428 if (QT & Decl::OBJC_TQ_Bycopy) 2429 S += 'O'; 2430 if (QT & Decl::OBJC_TQ_Byref) 2431 S += 'R'; 2432 if (QT & Decl::OBJC_TQ_Oneway) 2433 S += 'V'; 2434} 2435 2436void ASTContext::setBuiltinVaListType(QualType T) 2437{ 2438 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2439 2440 BuiltinVaListType = T; 2441} 2442 2443void ASTContext::setObjCIdType(TypedefDecl *TD) 2444{ 2445 ObjCIdType = getTypedefType(TD); 2446 2447 // typedef struct objc_object *id; 2448 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2449 // User error - caller will issue diagnostics. 2450 if (!ptr) 2451 return; 2452 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2453 // User error - caller will issue diagnostics. 2454 if (!rec) 2455 return; 2456 IdStructType = rec; 2457} 2458 2459void ASTContext::setObjCSelType(TypedefDecl *TD) 2460{ 2461 ObjCSelType = getTypedefType(TD); 2462 2463 // typedef struct objc_selector *SEL; 2464 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2465 if (!ptr) 2466 return; 2467 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2468 if (!rec) 2469 return; 2470 SelStructType = rec; 2471} 2472 2473void ASTContext::setObjCProtoType(QualType QT) 2474{ 2475 ObjCProtoType = QT; 2476} 2477 2478void ASTContext::setObjCClassType(TypedefDecl *TD) 2479{ 2480 ObjCClassType = getTypedefType(TD); 2481 2482 // typedef struct objc_class *Class; 2483 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2484 assert(ptr && "'Class' incorrectly typed"); 2485 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2486 assert(rec && "'Class' incorrectly typed"); 2487 ClassStructType = rec; 2488} 2489 2490void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 2491 assert(ObjCConstantStringType.isNull() && 2492 "'NSConstantString' type already set!"); 2493 2494 ObjCConstantStringType = getObjCInterfaceType(Decl); 2495} 2496 2497/// \brief Retrieve the template name that represents a qualified 2498/// template name such as \c std::vector. 2499TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 2500 bool TemplateKeyword, 2501 TemplateDecl *Template) { 2502 llvm::FoldingSetNodeID ID; 2503 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 2504 2505 void *InsertPos = 0; 2506 QualifiedTemplateName *QTN = 2507 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2508 if (!QTN) { 2509 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 2510 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 2511 } 2512 2513 return TemplateName(QTN); 2514} 2515 2516/// \brief Retrieve the template name that represents a dependent 2517/// template name such as \c MetaFun::template apply. 2518TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 2519 const IdentifierInfo *Name) { 2520 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 2521 2522 llvm::FoldingSetNodeID ID; 2523 DependentTemplateName::Profile(ID, NNS, Name); 2524 2525 void *InsertPos = 0; 2526 DependentTemplateName *QTN = 2527 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2528 2529 if (QTN) 2530 return TemplateName(QTN); 2531 2532 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2533 if (CanonNNS == NNS) { 2534 QTN = new (*this,4) DependentTemplateName(NNS, Name); 2535 } else { 2536 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 2537 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 2538 } 2539 2540 DependentTemplateNames.InsertNode(QTN, InsertPos); 2541 return TemplateName(QTN); 2542} 2543 2544/// getFromTargetType - Given one of the integer types provided by 2545/// TargetInfo, produce the corresponding type. The unsigned @p Type 2546/// is actually a value of type @c TargetInfo::IntType. 2547QualType ASTContext::getFromTargetType(unsigned Type) const { 2548 switch (Type) { 2549 case TargetInfo::NoInt: return QualType(); 2550 case TargetInfo::SignedShort: return ShortTy; 2551 case TargetInfo::UnsignedShort: return UnsignedShortTy; 2552 case TargetInfo::SignedInt: return IntTy; 2553 case TargetInfo::UnsignedInt: return UnsignedIntTy; 2554 case TargetInfo::SignedLong: return LongTy; 2555 case TargetInfo::UnsignedLong: return UnsignedLongTy; 2556 case TargetInfo::SignedLongLong: return LongLongTy; 2557 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 2558 } 2559 2560 assert(false && "Unhandled TargetInfo::IntType value"); 2561 return QualType(); 2562} 2563 2564//===----------------------------------------------------------------------===// 2565// Type Predicates. 2566//===----------------------------------------------------------------------===// 2567 2568/// isObjCNSObjectType - Return true if this is an NSObject object using 2569/// NSObject attribute on a c-style pointer type. 2570/// FIXME - Make it work directly on types. 2571/// 2572bool ASTContext::isObjCNSObjectType(QualType Ty) const { 2573 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2574 if (TypedefDecl *TD = TDT->getDecl()) 2575 if (TD->getAttr<ObjCNSObjectAttr>()) 2576 return true; 2577 } 2578 return false; 2579} 2580 2581/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 2582/// to an object type. This includes "id" and "Class" (two 'special' pointers 2583/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 2584/// ID type). 2585bool ASTContext::isObjCObjectPointerType(QualType Ty) const { 2586 if (Ty->isObjCQualifiedIdType()) 2587 return true; 2588 2589 // Blocks are objects. 2590 if (Ty->isBlockPointerType()) 2591 return true; 2592 2593 // All other object types are pointers. 2594 if (!Ty->isPointerType()) 2595 return false; 2596 2597 // Check to see if this is 'id' or 'Class', both of which are typedefs for 2598 // pointer types. This looks for the typedef specifically, not for the 2599 // underlying type. 2600 if (Ty.getUnqualifiedType() == getObjCIdType() || 2601 Ty.getUnqualifiedType() == getObjCClassType()) 2602 return true; 2603 2604 // If this a pointer to an interface (e.g. NSString*), it is ok. 2605 if (Ty->getAsPointerType()->getPointeeType()->isObjCInterfaceType()) 2606 return true; 2607 2608 // If is has NSObject attribute, OK as well. 2609 return isObjCNSObjectType(Ty); 2610} 2611 2612/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 2613/// garbage collection attribute. 2614/// 2615QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 2616 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 2617 if (getLangOptions().ObjC1 && 2618 getLangOptions().getGCMode() != LangOptions::NonGC) { 2619 GCAttrs = Ty.getObjCGCAttr(); 2620 // Default behavious under objective-c's gc is for objective-c pointers 2621 // (or pointers to them) be treated as though they were declared 2622 // as __strong. 2623 if (GCAttrs == QualType::GCNone) { 2624 if (isObjCObjectPointerType(Ty)) 2625 GCAttrs = QualType::Strong; 2626 else if (Ty->isPointerType()) 2627 return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType()); 2628 } 2629 } 2630 return GCAttrs; 2631} 2632 2633//===----------------------------------------------------------------------===// 2634// Type Compatibility Testing 2635//===----------------------------------------------------------------------===// 2636 2637/// typesAreBlockCompatible - This routine is called when comparing two 2638/// block types. Types must be strictly compatible here. For example, 2639/// C unfortunately doesn't produce an error for the following: 2640/// 2641/// int (*emptyArgFunc)(); 2642/// int (*intArgList)(int) = emptyArgFunc; 2643/// 2644/// For blocks, we will produce an error for the following (similar to C++): 2645/// 2646/// int (^emptyArgBlock)(); 2647/// int (^intArgBlock)(int) = emptyArgBlock; 2648/// 2649/// FIXME: When the dust settles on this integration, fold this into mergeTypes. 2650/// 2651bool ASTContext::typesAreBlockCompatible(QualType lhs, QualType rhs) { 2652 const FunctionType *lbase = lhs->getAsFunctionType(); 2653 const FunctionType *rbase = rhs->getAsFunctionType(); 2654 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 2655 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 2656 if (lproto && rproto) 2657 return !mergeTypes(lhs, rhs).isNull(); 2658 return false; 2659} 2660 2661/// areCompatVectorTypes - Return true if the two specified vector types are 2662/// compatible. 2663static bool areCompatVectorTypes(const VectorType *LHS, 2664 const VectorType *RHS) { 2665 assert(LHS->isCanonical() && RHS->isCanonical()); 2666 return LHS->getElementType() == RHS->getElementType() && 2667 LHS->getNumElements() == RHS->getNumElements(); 2668} 2669 2670/// canAssignObjCInterfaces - Return true if the two interface types are 2671/// compatible for assignment from RHS to LHS. This handles validation of any 2672/// protocol qualifiers on the LHS or RHS. 2673/// 2674bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 2675 const ObjCInterfaceType *RHS) { 2676 // Verify that the base decls are compatible: the RHS must be a subclass of 2677 // the LHS. 2678 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 2679 return false; 2680 2681 // RHS must have a superset of the protocols in the LHS. If the LHS is not 2682 // protocol qualified at all, then we are good. 2683 if (!isa<ObjCQualifiedInterfaceType>(LHS)) 2684 return true; 2685 2686 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 2687 // isn't a superset. 2688 if (!isa<ObjCQualifiedInterfaceType>(RHS)) 2689 return true; // FIXME: should return false! 2690 2691 // Finally, we must have two protocol-qualified interfaces. 2692 const ObjCQualifiedInterfaceType *LHSP =cast<ObjCQualifiedInterfaceType>(LHS); 2693 const ObjCQualifiedInterfaceType *RHSP =cast<ObjCQualifiedInterfaceType>(RHS); 2694 2695 // All LHS protocols must have a presence on the RHS. 2696 assert(LHSP->qual_begin() != LHSP->qual_end() && "Empty LHS protocol list?"); 2697 2698 for (ObjCQualifiedInterfaceType::qual_iterator LHSPI = LHSP->qual_begin(), 2699 LHSPE = LHSP->qual_end(); 2700 LHSPI != LHSPE; LHSPI++) { 2701 bool RHSImplementsProtocol = false; 2702 2703 // If the RHS doesn't implement the protocol on the left, the types 2704 // are incompatible. 2705 for (ObjCQualifiedInterfaceType::qual_iterator RHSPI = RHSP->qual_begin(), 2706 RHSPE = RHSP->qual_end(); 2707 !RHSImplementsProtocol && (RHSPI != RHSPE); RHSPI++) { 2708 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) 2709 RHSImplementsProtocol = true; 2710 } 2711 // FIXME: For better diagnostics, consider passing back the protocol name. 2712 if (!RHSImplementsProtocol) 2713 return false; 2714 } 2715 // The RHS implements all protocols listed on the LHS. 2716 return true; 2717} 2718 2719bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 2720 // get the "pointed to" types 2721 const PointerType *LHSPT = LHS->getAsPointerType(); 2722 const PointerType *RHSPT = RHS->getAsPointerType(); 2723 2724 if (!LHSPT || !RHSPT) 2725 return false; 2726 2727 QualType lhptee = LHSPT->getPointeeType(); 2728 QualType rhptee = RHSPT->getPointeeType(); 2729 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2730 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2731 // ID acts sort of like void* for ObjC interfaces 2732 if (LHSIface && isObjCIdStructType(rhptee)) 2733 return true; 2734 if (RHSIface && isObjCIdStructType(lhptee)) 2735 return true; 2736 if (!LHSIface || !RHSIface) 2737 return false; 2738 return canAssignObjCInterfaces(LHSIface, RHSIface) || 2739 canAssignObjCInterfaces(RHSIface, LHSIface); 2740} 2741 2742/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 2743/// both shall have the identically qualified version of a compatible type. 2744/// C99 6.2.7p1: Two types have compatible types if their types are the 2745/// same. See 6.7.[2,3,5] for additional rules. 2746bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 2747 return !mergeTypes(LHS, RHS).isNull(); 2748} 2749 2750QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 2751 const FunctionType *lbase = lhs->getAsFunctionType(); 2752 const FunctionType *rbase = rhs->getAsFunctionType(); 2753 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 2754 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 2755 bool allLTypes = true; 2756 bool allRTypes = true; 2757 2758 // Check return type 2759 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 2760 if (retType.isNull()) return QualType(); 2761 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 2762 allLTypes = false; 2763 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 2764 allRTypes = false; 2765 2766 if (lproto && rproto) { // two C99 style function prototypes 2767 unsigned lproto_nargs = lproto->getNumArgs(); 2768 unsigned rproto_nargs = rproto->getNumArgs(); 2769 2770 // Compatible functions must have the same number of arguments 2771 if (lproto_nargs != rproto_nargs) 2772 return QualType(); 2773 2774 // Variadic and non-variadic functions aren't compatible 2775 if (lproto->isVariadic() != rproto->isVariadic()) 2776 return QualType(); 2777 2778 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 2779 return QualType(); 2780 2781 // Check argument compatibility 2782 llvm::SmallVector<QualType, 10> types; 2783 for (unsigned i = 0; i < lproto_nargs; i++) { 2784 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 2785 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 2786 QualType argtype = mergeTypes(largtype, rargtype); 2787 if (argtype.isNull()) return QualType(); 2788 types.push_back(argtype); 2789 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 2790 allLTypes = false; 2791 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 2792 allRTypes = false; 2793 } 2794 if (allLTypes) return lhs; 2795 if (allRTypes) return rhs; 2796 return getFunctionType(retType, types.begin(), types.size(), 2797 lproto->isVariadic(), lproto->getTypeQuals()); 2798 } 2799 2800 if (lproto) allRTypes = false; 2801 if (rproto) allLTypes = false; 2802 2803 const FunctionProtoType *proto = lproto ? lproto : rproto; 2804 if (proto) { 2805 if (proto->isVariadic()) return QualType(); 2806 // Check that the types are compatible with the types that 2807 // would result from default argument promotions (C99 6.7.5.3p15). 2808 // The only types actually affected are promotable integer 2809 // types and floats, which would be passed as a different 2810 // type depending on whether the prototype is visible. 2811 unsigned proto_nargs = proto->getNumArgs(); 2812 for (unsigned i = 0; i < proto_nargs; ++i) { 2813 QualType argTy = proto->getArgType(i); 2814 if (argTy->isPromotableIntegerType() || 2815 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 2816 return QualType(); 2817 } 2818 2819 if (allLTypes) return lhs; 2820 if (allRTypes) return rhs; 2821 return getFunctionType(retType, proto->arg_type_begin(), 2822 proto->getNumArgs(), lproto->isVariadic(), 2823 lproto->getTypeQuals()); 2824 } 2825 2826 if (allLTypes) return lhs; 2827 if (allRTypes) return rhs; 2828 return getFunctionNoProtoType(retType); 2829} 2830 2831QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 2832 // C++ [expr]: If an expression initially has the type "reference to T", the 2833 // type is adjusted to "T" prior to any further analysis, the expression 2834 // designates the object or function denoted by the reference, and the 2835 // expression is an lvalue unless the reference is an rvalue reference and 2836 // the expression is a function call (possibly inside parentheses). 2837 // FIXME: C++ shouldn't be going through here! The rules are different 2838 // enough that they should be handled separately. 2839 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 2840 // shouldn't be going through here! 2841 if (const ReferenceType *RT = LHS->getAsReferenceType()) 2842 LHS = RT->getPointeeType(); 2843 if (const ReferenceType *RT = RHS->getAsReferenceType()) 2844 RHS = RT->getPointeeType(); 2845 2846 QualType LHSCan = getCanonicalType(LHS), 2847 RHSCan = getCanonicalType(RHS); 2848 2849 // If two types are identical, they are compatible. 2850 if (LHSCan == RHSCan) 2851 return LHS; 2852 2853 // If the qualifiers are different, the types aren't compatible 2854 // Note that we handle extended qualifiers later, in the 2855 // case for ExtQualType. 2856 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 2857 return QualType(); 2858 2859 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 2860 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 2861 2862 // We want to consider the two function types to be the same for these 2863 // comparisons, just force one to the other. 2864 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 2865 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 2866 2867 // Same as above for arrays 2868 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 2869 LHSClass = Type::ConstantArray; 2870 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 2871 RHSClass = Type::ConstantArray; 2872 2873 // Canonicalize ExtVector -> Vector. 2874 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 2875 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 2876 2877 // Consider qualified interfaces and interfaces the same. 2878 if (LHSClass == Type::ObjCQualifiedInterface) LHSClass = Type::ObjCInterface; 2879 if (RHSClass == Type::ObjCQualifiedInterface) RHSClass = Type::ObjCInterface; 2880 2881 // If the canonical type classes don't match. 2882 if (LHSClass != RHSClass) { 2883 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2884 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2885 2886 // ID acts sort of like void* for ObjC interfaces 2887 if (LHSIface && isObjCIdStructType(RHS)) 2888 return LHS; 2889 if (RHSIface && isObjCIdStructType(LHS)) 2890 return RHS; 2891 2892 // ID is compatible with all qualified id types. 2893 if (LHS->isObjCQualifiedIdType()) { 2894 if (const PointerType *PT = RHS->getAsPointerType()) { 2895 QualType pType = PT->getPointeeType(); 2896 if (isObjCIdStructType(pType)) 2897 return LHS; 2898 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 2899 // Unfortunately, this API is part of Sema (which we don't have access 2900 // to. Need to refactor. The following check is insufficient, since we 2901 // need to make sure the class implements the protocol. 2902 if (pType->isObjCInterfaceType()) 2903 return LHS; 2904 } 2905 } 2906 if (RHS->isObjCQualifiedIdType()) { 2907 if (const PointerType *PT = LHS->getAsPointerType()) { 2908 QualType pType = PT->getPointeeType(); 2909 if (isObjCIdStructType(pType)) 2910 return RHS; 2911 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 2912 // Unfortunately, this API is part of Sema (which we don't have access 2913 // to. Need to refactor. The following check is insufficient, since we 2914 // need to make sure the class implements the protocol. 2915 if (pType->isObjCInterfaceType()) 2916 return RHS; 2917 } 2918 } 2919 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 2920 // a signed integer type, or an unsigned integer type. 2921 if (const EnumType* ETy = LHS->getAsEnumType()) { 2922 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 2923 return RHS; 2924 } 2925 if (const EnumType* ETy = RHS->getAsEnumType()) { 2926 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 2927 return LHS; 2928 } 2929 2930 return QualType(); 2931 } 2932 2933 // The canonical type classes match. 2934 switch (LHSClass) { 2935#define TYPE(Class, Base) 2936#define ABSTRACT_TYPE(Class, Base) 2937#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 2938#define DEPENDENT_TYPE(Class, Base) case Type::Class: 2939#include "clang/AST/TypeNodes.def" 2940 assert(false && "Non-canonical and dependent types shouldn't get here"); 2941 return QualType(); 2942 2943 case Type::LValueReference: 2944 case Type::RValueReference: 2945 case Type::MemberPointer: 2946 assert(false && "C++ should never be in mergeTypes"); 2947 return QualType(); 2948 2949 case Type::IncompleteArray: 2950 case Type::VariableArray: 2951 case Type::FunctionProto: 2952 case Type::ExtVector: 2953 case Type::ObjCQualifiedInterface: 2954 assert(false && "Types are eliminated above"); 2955 return QualType(); 2956 2957 case Type::Pointer: 2958 { 2959 // Merge two pointer types, while trying to preserve typedef info 2960 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 2961 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 2962 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 2963 if (ResultType.isNull()) return QualType(); 2964 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 2965 return LHS; 2966 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 2967 return RHS; 2968 return getPointerType(ResultType); 2969 } 2970 case Type::BlockPointer: 2971 { 2972 // Merge two block pointer types, while trying to preserve typedef info 2973 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 2974 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 2975 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 2976 if (ResultType.isNull()) return QualType(); 2977 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 2978 return LHS; 2979 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 2980 return RHS; 2981 return getBlockPointerType(ResultType); 2982 } 2983 case Type::ConstantArray: 2984 { 2985 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 2986 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 2987 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 2988 return QualType(); 2989 2990 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 2991 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 2992 QualType ResultType = mergeTypes(LHSElem, RHSElem); 2993 if (ResultType.isNull()) return QualType(); 2994 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 2995 return LHS; 2996 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 2997 return RHS; 2998 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 2999 ArrayType::ArraySizeModifier(), 0); 3000 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3001 ArrayType::ArraySizeModifier(), 0); 3002 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3003 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3004 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3005 return LHS; 3006 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3007 return RHS; 3008 if (LVAT) { 3009 // FIXME: This isn't correct! But tricky to implement because 3010 // the array's size has to be the size of LHS, but the type 3011 // has to be different. 3012 return LHS; 3013 } 3014 if (RVAT) { 3015 // FIXME: This isn't correct! But tricky to implement because 3016 // the array's size has to be the size of RHS, but the type 3017 // has to be different. 3018 return RHS; 3019 } 3020 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3021 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3022 return getIncompleteArrayType(ResultType, ArrayType::ArraySizeModifier(),0); 3023 } 3024 case Type::FunctionNoProto: 3025 return mergeFunctionTypes(LHS, RHS); 3026 case Type::Record: 3027 case Type::Enum: 3028 // FIXME: Why are these compatible? 3029 if (isObjCIdStructType(LHS) && isObjCClassStructType(RHS)) return LHS; 3030 if (isObjCClassStructType(LHS) && isObjCIdStructType(RHS)) return LHS; 3031 return QualType(); 3032 case Type::Builtin: 3033 // Only exactly equal builtin types are compatible, which is tested above. 3034 return QualType(); 3035 case Type::Complex: 3036 // Distinct complex types are incompatible. 3037 return QualType(); 3038 case Type::Vector: 3039 // FIXME: The merged type should be an ExtVector! 3040 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3041 return LHS; 3042 return QualType(); 3043 case Type::ObjCInterface: { 3044 // Check if the interfaces are assignment compatible. 3045 // FIXME: This should be type compatibility, e.g. whether 3046 // "LHS x; RHS x;" at global scope is legal. 3047 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3048 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3049 if (LHSIface && RHSIface && 3050 canAssignObjCInterfaces(LHSIface, RHSIface)) 3051 return LHS; 3052 3053 return QualType(); 3054 } 3055 case Type::ObjCQualifiedId: 3056 // Distinct qualified id's are not compatible. 3057 return QualType(); 3058 case Type::FixedWidthInt: 3059 // Distinct fixed-width integers are not compatible. 3060 return QualType(); 3061 case Type::ObjCQualifiedClass: 3062 // Distinct qualified classes are not compatible. 3063 return QualType(); 3064 case Type::ExtQual: 3065 // FIXME: ExtQual types can be compatible even if they're not 3066 // identical! 3067 return QualType(); 3068 // First attempt at an implementation, but I'm not really sure it's 3069 // right... 3070#if 0 3071 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3072 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3073 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3074 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3075 return QualType(); 3076 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3077 LHSBase = QualType(LQual->getBaseType(), 0); 3078 RHSBase = QualType(RQual->getBaseType(), 0); 3079 ResultType = mergeTypes(LHSBase, RHSBase); 3080 if (ResultType.isNull()) return QualType(); 3081 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3082 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3083 return LHS; 3084 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3085 return RHS; 3086 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3087 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3088 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3089 return ResultType; 3090#endif 3091 3092 case Type::TemplateSpecialization: 3093 assert(false && "Dependent types have no size"); 3094 break; 3095 } 3096 3097 return QualType(); 3098} 3099 3100//===----------------------------------------------------------------------===// 3101// Integer Predicates 3102//===----------------------------------------------------------------------===// 3103 3104unsigned ASTContext::getIntWidth(QualType T) { 3105 if (T == BoolTy) 3106 return 1; 3107 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3108 return FWIT->getWidth(); 3109 } 3110 // For builtin types, just use the standard type sizing method 3111 return (unsigned)getTypeSize(T); 3112} 3113 3114QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3115 assert(T->isSignedIntegerType() && "Unexpected type"); 3116 if (const EnumType* ETy = T->getAsEnumType()) 3117 T = ETy->getDecl()->getIntegerType(); 3118 const BuiltinType* BTy = T->getAsBuiltinType(); 3119 assert (BTy && "Unexpected signed integer type"); 3120 switch (BTy->getKind()) { 3121 case BuiltinType::Char_S: 3122 case BuiltinType::SChar: 3123 return UnsignedCharTy; 3124 case BuiltinType::Short: 3125 return UnsignedShortTy; 3126 case BuiltinType::Int: 3127 return UnsignedIntTy; 3128 case BuiltinType::Long: 3129 return UnsignedLongTy; 3130 case BuiltinType::LongLong: 3131 return UnsignedLongLongTy; 3132 default: 3133 assert(0 && "Unexpected signed integer type"); 3134 return QualType(); 3135 } 3136} 3137 3138 3139//===----------------------------------------------------------------------===// 3140// Serialization Support 3141//===----------------------------------------------------------------------===// 3142 3143enum { 3144 BasicMetadataBlock = 1, 3145 ASTContextBlock = 2, 3146 DeclsBlock = 3 3147}; 3148 3149void ASTContext::EmitASTBitcodeBuffer(std::vector<unsigned char> &Buffer) const{ 3150 // Create bitstream. 3151 llvm::BitstreamWriter Stream(Buffer); 3152 3153 // Emit the preamble. 3154 Stream.Emit((unsigned)'B', 8); 3155 Stream.Emit((unsigned)'C', 8); 3156 Stream.Emit(0xC, 4); 3157 Stream.Emit(0xF, 4); 3158 Stream.Emit(0xE, 4); 3159 Stream.Emit(0x0, 4); 3160 3161 // Create serializer. 3162 llvm::Serializer S(Stream); 3163 3164 // ===---------------------------------------------------===/ 3165 // Serialize the "Translation Unit" metadata. 3166 // ===---------------------------------------------------===/ 3167 3168 // Emit ASTContext. 3169 S.EnterBlock(ASTContextBlock); 3170 S.EmitOwnedPtr(this); 3171 S.ExitBlock(); // exit "ASTContextBlock" 3172 3173 S.EnterBlock(BasicMetadataBlock); 3174 3175 // Block for SourceManager and Target. Allows easy skipping 3176 // around to the block for the Selectors during deserialization. 3177 S.EnterBlock(); 3178 3179 // Emit the SourceManager. 3180 S.Emit(getSourceManager()); 3181 3182 // Emit the Target. 3183 S.EmitPtr(&Target); 3184 S.EmitCStr(Target.getTargetTriple()); 3185 3186 S.ExitBlock(); // exit "SourceManager and Target Block" 3187 3188 // Emit the Selectors. 3189 S.Emit(Selectors); 3190 3191 // Emit the Identifier Table. 3192 S.Emit(Idents); 3193 3194 S.ExitBlock(); // exit "BasicMetadataBlock" 3195} 3196 3197 3198/// Emit - Serialize an ASTContext object to Bitcode. 3199void ASTContext::Emit(llvm::Serializer& S) const { 3200 S.Emit(LangOpts); 3201 S.EmitRef(SourceMgr); 3202 S.EmitRef(Target); 3203 S.EmitRef(Idents); 3204 S.EmitRef(Selectors); 3205 3206 // Emit the size of the type vector so that we can reserve that size 3207 // when we reconstitute the ASTContext object. 3208 S.EmitInt(Types.size()); 3209 3210 for (std::vector<Type*>::const_iterator I=Types.begin(), E=Types.end(); 3211 I!=E;++I) 3212 (*I)->Emit(S); 3213 3214 S.EmitOwnedPtr(TUDecl); 3215 3216 // FIXME: S.EmitOwnedPtr(CFConstantStringTypeDecl); 3217} 3218 3219 3220ASTContext *ASTContext::ReadASTBitcodeBuffer(llvm::MemoryBuffer &Buffer, 3221 FileManager &FMgr) { 3222 // Check if the file is of the proper length. 3223 if (Buffer.getBufferSize() & 0x3) { 3224 // FIXME: Provide diagnostic: "Length should be a multiple of 4 bytes." 3225 return 0; 3226 } 3227 3228 // Create the bitstream reader. 3229 unsigned char *BufPtr = (unsigned char *)Buffer.getBufferStart(); 3230 llvm::BitstreamReader Stream(BufPtr, BufPtr+Buffer.getBufferSize()); 3231 3232 if (Stream.Read(8) != 'B' || 3233 Stream.Read(8) != 'C' || 3234 Stream.Read(4) != 0xC || 3235 Stream.Read(4) != 0xF || 3236 Stream.Read(4) != 0xE || 3237 Stream.Read(4) != 0x0) { 3238 // FIXME: Provide diagnostic. 3239 return NULL; 3240 } 3241 3242 // Create the deserializer. 3243 llvm::Deserializer Dezr(Stream); 3244 3245 // ===---------------------------------------------------===/ 3246 // Deserialize the "Translation Unit" metadata. 3247 // ===---------------------------------------------------===/ 3248 3249 // Skip to the BasicMetaDataBlock. First jump to ASTContextBlock 3250 // (which will appear earlier) and record its location. 3251 3252 bool FoundBlock = Dezr.SkipToBlock(ASTContextBlock); 3253 assert (FoundBlock); 3254 3255 llvm::Deserializer::Location ASTContextBlockLoc = 3256 Dezr.getCurrentBlockLocation(); 3257 3258 FoundBlock = Dezr.SkipToBlock(BasicMetadataBlock); 3259 assert (FoundBlock); 3260 3261 // Read the SourceManager. 3262 SourceManager::CreateAndRegister(Dezr, FMgr); 3263 3264 { // Read the TargetInfo. 3265 llvm::SerializedPtrID PtrID = Dezr.ReadPtrID(); 3266 char* triple = Dezr.ReadCStr(NULL,0,true); 3267 Dezr.RegisterPtr(PtrID, TargetInfo::CreateTargetInfo(std::string(triple))); 3268 delete [] triple; 3269 } 3270 3271 // For Selectors, we must read the identifier table first because the 3272 // SelectorTable depends on the identifiers being already deserialized. 3273 llvm::Deserializer::Location SelectorBlkLoc = Dezr.getCurrentBlockLocation(); 3274 Dezr.SkipBlock(); 3275 3276 // Read the identifier table. 3277 IdentifierTable::CreateAndRegister(Dezr); 3278 3279 // Now jump back and read the selectors. 3280 Dezr.JumpTo(SelectorBlkLoc); 3281 SelectorTable::CreateAndRegister(Dezr); 3282 3283 // Now jump back to ASTContextBlock and read the ASTContext. 3284 Dezr.JumpTo(ASTContextBlockLoc); 3285 return Dezr.ReadOwnedPtr<ASTContext>(); 3286} 3287 3288ASTContext* ASTContext::Create(llvm::Deserializer& D) { 3289 3290 // Read the language options. 3291 LangOptions LOpts; 3292 LOpts.Read(D); 3293 3294 SourceManager &SM = D.ReadRef<SourceManager>(); 3295 TargetInfo &t = D.ReadRef<TargetInfo>(); 3296 IdentifierTable &idents = D.ReadRef<IdentifierTable>(); 3297 SelectorTable &sels = D.ReadRef<SelectorTable>(); 3298 3299 unsigned size_reserve = D.ReadInt(); 3300 3301 ASTContext* A = new ASTContext(LOpts, SM, t, idents, sels, 3302 size_reserve); 3303 3304 for (unsigned i = 0; i < size_reserve; ++i) 3305 Type::Create(*A,i,D); 3306 3307 A->TUDecl = cast<TranslationUnitDecl>(D.ReadOwnedPtr<Decl>(*A)); 3308 3309 // FIXME: A->CFConstantStringTypeDecl = D.ReadOwnedPtr<RecordDecl>(); 3310 3311 return A; 3312} 3313