ASTContext.cpp revision 16ff705a594697f98b9473f9b7e7d378f331fe4b
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 llvm::SmallVectorImpl<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 if (ObjCIvarDecl *IV = (*I)->getPropertyIvarDecl()) 615 Fields.push_back(cast<FieldDecl>(IV)); 616 } 617} 618 619/// addRecordToClass - produces record info. for the class for its 620/// ivars and all those inherited. 621/// 622const RecordDecl *ASTContext::addRecordToClass(const ObjCInterfaceDecl *D) { 623 const RecordDecl *&RD = ASTRecordForInterface[D]; 624 if (RD) 625 return RD; 626 627 llvm::SmallVector<FieldDecl*, 32> RecFields; 628 CollectObjCIvars(D, RecFields); 629 RecordDecl *NewRD = RecordDecl::Create(*this, TagDecl::TK_struct, 0, 630 D->getLocation(), 631 D->getIdentifier()); 632 /// FIXME! Can do collection of ivars and adding to the record while 633 /// doing it. 634 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 635 NewRD->addDecl(FieldDecl::Create(*this, NewRD, 636 RecFields[i]->getLocation(), 637 RecFields[i]->getIdentifier(), 638 RecFields[i]->getType(), 639 RecFields[i]->getBitWidth(), false)); 640 } 641 642 NewRD->completeDefinition(*this); 643 RD = NewRD; 644 return RD; 645} 646 647/// setFieldDecl - maps a field for the given Ivar reference node. 648// 649void ASTContext::setFieldDecl(const ObjCInterfaceDecl *OI, 650 const ObjCIvarDecl *Ivar, 651 const ObjCIvarRefExpr *MRef) { 652 ASTFieldForIvarRef[MRef] = OI->lookupFieldDeclForIvar(*this, Ivar); 653} 654 655/// getASTObjcInterfaceLayout - Get or compute information about the layout of 656/// the specified Objective C, which indicates its size and ivar 657/// position information. 658const ASTRecordLayout & 659ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 660 // Look up this layout, if already laid out, return what we have. 661 const ASTRecordLayout *&Entry = ASTObjCInterfaces[D]; 662 if (Entry) return *Entry; 663 664 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 665 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 666 ASTRecordLayout *NewEntry = NULL; 667 unsigned FieldCount = D->ivar_size(); 668 if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 669 FieldCount++; 670 const ASTRecordLayout &SL = getASTObjCInterfaceLayout(SD); 671 unsigned Alignment = SL.getAlignment(); 672 uint64_t Size = SL.getSize(); 673 NewEntry = new ASTRecordLayout(Size, Alignment); 674 NewEntry->InitializeLayout(FieldCount); 675 // Super class is at the beginning of the layout. 676 NewEntry->SetFieldOffset(0, 0); 677 } else { 678 NewEntry = new ASTRecordLayout(); 679 NewEntry->InitializeLayout(FieldCount); 680 } 681 Entry = NewEntry; 682 683 unsigned StructPacking = 0; 684 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 685 StructPacking = PA->getAlignment(); 686 687 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 688 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 689 AA->getAlignment())); 690 691 // Layout each ivar sequentially. 692 unsigned i = 0; 693 for (ObjCInterfaceDecl::ivar_iterator IVI = D->ivar_begin(), 694 IVE = D->ivar_end(); IVI != IVE; ++IVI) { 695 const ObjCIvarDecl* Ivar = (*IVI); 696 NewEntry->LayoutField(Ivar, i++, false, StructPacking, *this); 697 } 698 699 // Finally, round the size of the total struct up to the alignment of the 700 // struct itself. 701 NewEntry->FinalizeLayout(); 702 return *NewEntry; 703} 704 705/// getASTRecordLayout - Get or compute information about the layout of the 706/// specified record (struct/union/class), which indicates its size and field 707/// position information. 708const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 709 D = D->getDefinition(*this); 710 assert(D && "Cannot get layout of forward declarations!"); 711 712 // Look up this layout, if already laid out, return what we have. 713 const ASTRecordLayout *&Entry = ASTRecordLayouts[D]; 714 if (Entry) return *Entry; 715 716 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 717 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 718 ASTRecordLayout *NewEntry = new ASTRecordLayout(); 719 Entry = NewEntry; 720 721 // FIXME: Avoid linear walk through the fields, if possible. 722 NewEntry->InitializeLayout(std::distance(D->field_begin(), D->field_end())); 723 bool IsUnion = D->isUnion(); 724 725 unsigned StructPacking = 0; 726 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 727 StructPacking = PA->getAlignment(); 728 729 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 730 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 731 AA->getAlignment())); 732 733 // Layout each field, for now, just sequentially, respecting alignment. In 734 // the future, this will need to be tweakable by targets. 735 unsigned FieldIdx = 0; 736 for (RecordDecl::field_iterator Field = D->field_begin(), 737 FieldEnd = D->field_end(); 738 Field != FieldEnd; (void)++Field, ++FieldIdx) 739 NewEntry->LayoutField(*Field, FieldIdx, IsUnion, StructPacking, *this); 740 741 // Finally, round the size of the total struct up to the alignment of the 742 // struct itself. 743 NewEntry->FinalizeLayout(); 744 return *NewEntry; 745} 746 747//===----------------------------------------------------------------------===// 748// Type creation/memoization methods 749//===----------------------------------------------------------------------===// 750 751QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 752 QualType CanT = getCanonicalType(T); 753 if (CanT.getAddressSpace() == AddressSpace) 754 return T; 755 756 // If we are composing extended qualifiers together, merge together into one 757 // ExtQualType node. 758 unsigned CVRQuals = T.getCVRQualifiers(); 759 QualType::GCAttrTypes GCAttr = QualType::GCNone; 760 Type *TypeNode = T.getTypePtr(); 761 762 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 763 // If this type already has an address space specified, it cannot get 764 // another one. 765 assert(EQT->getAddressSpace() == 0 && 766 "Type cannot be in multiple addr spaces!"); 767 GCAttr = EQT->getObjCGCAttr(); 768 TypeNode = EQT->getBaseType(); 769 } 770 771 // Check if we've already instantiated this type. 772 llvm::FoldingSetNodeID ID; 773 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 774 void *InsertPos = 0; 775 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 776 return QualType(EXTQy, CVRQuals); 777 778 // If the base type isn't canonical, this won't be a canonical type either, 779 // so fill in the canonical type field. 780 QualType Canonical; 781 if (!TypeNode->isCanonical()) { 782 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 783 784 // Update InsertPos, the previous call could have invalidated it. 785 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 786 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 787 } 788 ExtQualType *New = 789 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 790 ExtQualTypes.InsertNode(New, InsertPos); 791 Types.push_back(New); 792 return QualType(New, CVRQuals); 793} 794 795QualType ASTContext::getObjCGCQualType(QualType T, 796 QualType::GCAttrTypes GCAttr) { 797 QualType CanT = getCanonicalType(T); 798 if (CanT.getObjCGCAttr() == GCAttr) 799 return T; 800 801 // If we are composing extended qualifiers together, merge together into one 802 // ExtQualType node. 803 unsigned CVRQuals = T.getCVRQualifiers(); 804 Type *TypeNode = T.getTypePtr(); 805 unsigned AddressSpace = 0; 806 807 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 808 // If this type already has an address space specified, it cannot get 809 // another one. 810 assert(EQT->getObjCGCAttr() == QualType::GCNone && 811 "Type cannot be in multiple addr spaces!"); 812 AddressSpace = EQT->getAddressSpace(); 813 TypeNode = EQT->getBaseType(); 814 } 815 816 // Check if we've already instantiated an gc qual'd type of this type. 817 llvm::FoldingSetNodeID ID; 818 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 819 void *InsertPos = 0; 820 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 821 return QualType(EXTQy, CVRQuals); 822 823 // If the base type isn't canonical, this won't be a canonical type either, 824 // so fill in the canonical type field. 825 // FIXME: Isn't this also not canonical if the base type is a array 826 // or pointer type? I can't find any documentation for objc_gc, though... 827 QualType Canonical; 828 if (!T->isCanonical()) { 829 Canonical = getObjCGCQualType(CanT, GCAttr); 830 831 // Update InsertPos, the previous call could have invalidated it. 832 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 833 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 834 } 835 ExtQualType *New = 836 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 837 ExtQualTypes.InsertNode(New, InsertPos); 838 Types.push_back(New); 839 return QualType(New, CVRQuals); 840} 841 842/// getComplexType - Return the uniqued reference to the type for a complex 843/// number with the specified element type. 844QualType ASTContext::getComplexType(QualType T) { 845 // Unique pointers, to guarantee there is only one pointer of a particular 846 // structure. 847 llvm::FoldingSetNodeID ID; 848 ComplexType::Profile(ID, T); 849 850 void *InsertPos = 0; 851 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 852 return QualType(CT, 0); 853 854 // If the pointee type isn't canonical, this won't be a canonical type either, 855 // so fill in the canonical type field. 856 QualType Canonical; 857 if (!T->isCanonical()) { 858 Canonical = getComplexType(getCanonicalType(T)); 859 860 // Get the new insert position for the node we care about. 861 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 862 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 863 } 864 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 865 Types.push_back(New); 866 ComplexTypes.InsertNode(New, InsertPos); 867 return QualType(New, 0); 868} 869 870QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 871 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 872 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 873 FixedWidthIntType *&Entry = Map[Width]; 874 if (!Entry) 875 Entry = new FixedWidthIntType(Width, Signed); 876 return QualType(Entry, 0); 877} 878 879/// getPointerType - Return the uniqued reference to the type for a pointer to 880/// the specified type. 881QualType ASTContext::getPointerType(QualType T) { 882 // Unique pointers, to guarantee there is only one pointer of a particular 883 // structure. 884 llvm::FoldingSetNodeID ID; 885 PointerType::Profile(ID, T); 886 887 void *InsertPos = 0; 888 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 889 return QualType(PT, 0); 890 891 // If the pointee type isn't canonical, this won't be a canonical type either, 892 // so fill in the canonical type field. 893 QualType Canonical; 894 if (!T->isCanonical()) { 895 Canonical = getPointerType(getCanonicalType(T)); 896 897 // Get the new insert position for the node we care about. 898 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 899 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 900 } 901 PointerType *New = new (*this,8) PointerType(T, Canonical); 902 Types.push_back(New); 903 PointerTypes.InsertNode(New, InsertPos); 904 return QualType(New, 0); 905} 906 907/// getBlockPointerType - Return the uniqued reference to the type for 908/// a pointer to the specified block. 909QualType ASTContext::getBlockPointerType(QualType T) { 910 assert(T->isFunctionType() && "block of function types only"); 911 // Unique pointers, to guarantee there is only one block of a particular 912 // structure. 913 llvm::FoldingSetNodeID ID; 914 BlockPointerType::Profile(ID, T); 915 916 void *InsertPos = 0; 917 if (BlockPointerType *PT = 918 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 919 return QualType(PT, 0); 920 921 // If the block pointee type isn't canonical, this won't be a canonical 922 // type either so fill in the canonical type field. 923 QualType Canonical; 924 if (!T->isCanonical()) { 925 Canonical = getBlockPointerType(getCanonicalType(T)); 926 927 // Get the new insert position for the node we care about. 928 BlockPointerType *NewIP = 929 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 930 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 931 } 932 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 933 Types.push_back(New); 934 BlockPointerTypes.InsertNode(New, InsertPos); 935 return QualType(New, 0); 936} 937 938/// getLValueReferenceType - Return the uniqued reference to the type for an 939/// lvalue reference to the specified type. 940QualType ASTContext::getLValueReferenceType(QualType T) { 941 // Unique pointers, to guarantee there is only one pointer of a particular 942 // structure. 943 llvm::FoldingSetNodeID ID; 944 ReferenceType::Profile(ID, T); 945 946 void *InsertPos = 0; 947 if (LValueReferenceType *RT = 948 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 949 return QualType(RT, 0); 950 951 // If the referencee type isn't canonical, this won't be a canonical type 952 // either, so fill in the canonical type field. 953 QualType Canonical; 954 if (!T->isCanonical()) { 955 Canonical = getLValueReferenceType(getCanonicalType(T)); 956 957 // Get the new insert position for the node we care about. 958 LValueReferenceType *NewIP = 959 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 960 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 961 } 962 963 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 964 Types.push_back(New); 965 LValueReferenceTypes.InsertNode(New, InsertPos); 966 return QualType(New, 0); 967} 968 969/// getRValueReferenceType - Return the uniqued reference to the type for an 970/// rvalue reference to the specified type. 971QualType ASTContext::getRValueReferenceType(QualType T) { 972 // Unique pointers, to guarantee there is only one pointer of a particular 973 // structure. 974 llvm::FoldingSetNodeID ID; 975 ReferenceType::Profile(ID, T); 976 977 void *InsertPos = 0; 978 if (RValueReferenceType *RT = 979 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 980 return QualType(RT, 0); 981 982 // If the referencee type isn't canonical, this won't be a canonical type 983 // either, so fill in the canonical type field. 984 QualType Canonical; 985 if (!T->isCanonical()) { 986 Canonical = getRValueReferenceType(getCanonicalType(T)); 987 988 // Get the new insert position for the node we care about. 989 RValueReferenceType *NewIP = 990 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 991 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 992 } 993 994 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 995 Types.push_back(New); 996 RValueReferenceTypes.InsertNode(New, InsertPos); 997 return QualType(New, 0); 998} 999 1000/// getMemberPointerType - Return the uniqued reference to the type for a 1001/// member pointer to the specified type, in the specified class. 1002QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1003{ 1004 // Unique pointers, to guarantee there is only one pointer of a particular 1005 // structure. 1006 llvm::FoldingSetNodeID ID; 1007 MemberPointerType::Profile(ID, T, Cls); 1008 1009 void *InsertPos = 0; 1010 if (MemberPointerType *PT = 1011 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1012 return QualType(PT, 0); 1013 1014 // If the pointee or class type isn't canonical, this won't be a canonical 1015 // type either, so fill in the canonical type field. 1016 QualType Canonical; 1017 if (!T->isCanonical()) { 1018 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1019 1020 // Get the new insert position for the node we care about. 1021 MemberPointerType *NewIP = 1022 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1023 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1024 } 1025 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1026 Types.push_back(New); 1027 MemberPointerTypes.InsertNode(New, InsertPos); 1028 return QualType(New, 0); 1029} 1030 1031/// getConstantArrayType - Return the unique reference to the type for an 1032/// array of the specified element type. 1033QualType ASTContext::getConstantArrayType(QualType EltTy, 1034 const llvm::APInt &ArySize, 1035 ArrayType::ArraySizeModifier ASM, 1036 unsigned EltTypeQuals) { 1037 llvm::FoldingSetNodeID ID; 1038 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1039 1040 void *InsertPos = 0; 1041 if (ConstantArrayType *ATP = 1042 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1043 return QualType(ATP, 0); 1044 1045 // If the element type isn't canonical, this won't be a canonical type either, 1046 // so fill in the canonical type field. 1047 QualType Canonical; 1048 if (!EltTy->isCanonical()) { 1049 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1050 ASM, EltTypeQuals); 1051 // Get the new insert position for the node we care about. 1052 ConstantArrayType *NewIP = 1053 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1054 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1055 } 1056 1057 ConstantArrayType *New = 1058 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1059 ConstantArrayTypes.InsertNode(New, InsertPos); 1060 Types.push_back(New); 1061 return QualType(New, 0); 1062} 1063 1064/// getVariableArrayType - Returns a non-unique reference to the type for a 1065/// variable array of the specified element type. 1066QualType ASTContext::getVariableArrayType(QualType EltTy, Expr *NumElts, 1067 ArrayType::ArraySizeModifier ASM, 1068 unsigned EltTypeQuals) { 1069 // Since we don't unique expressions, it isn't possible to unique VLA's 1070 // that have an expression provided for their size. 1071 1072 VariableArrayType *New = 1073 new(*this,8)VariableArrayType(EltTy,QualType(), NumElts, ASM, EltTypeQuals); 1074 1075 VariableArrayTypes.push_back(New); 1076 Types.push_back(New); 1077 return QualType(New, 0); 1078} 1079 1080/// getDependentSizedArrayType - Returns a non-unique reference to 1081/// the type for a dependently-sized array of the specified element 1082/// type. FIXME: We will need these to be uniqued, or at least 1083/// comparable, at some point. 1084QualType ASTContext::getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 1085 ArrayType::ArraySizeModifier ASM, 1086 unsigned EltTypeQuals) { 1087 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1088 "Size must be type- or value-dependent!"); 1089 1090 // Since we don't unique expressions, it isn't possible to unique 1091 // dependently-sized array types. 1092 1093 DependentSizedArrayType *New = 1094 new (*this,8) DependentSizedArrayType(EltTy, QualType(), NumElts, 1095 ASM, EltTypeQuals); 1096 1097 DependentSizedArrayTypes.push_back(New); 1098 Types.push_back(New); 1099 return QualType(New, 0); 1100} 1101 1102QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1103 ArrayType::ArraySizeModifier ASM, 1104 unsigned EltTypeQuals) { 1105 llvm::FoldingSetNodeID ID; 1106 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1107 1108 void *InsertPos = 0; 1109 if (IncompleteArrayType *ATP = 1110 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1111 return QualType(ATP, 0); 1112 1113 // If the element type isn't canonical, this won't be a canonical type 1114 // either, so fill in the canonical type field. 1115 QualType Canonical; 1116 1117 if (!EltTy->isCanonical()) { 1118 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1119 ASM, EltTypeQuals); 1120 1121 // Get the new insert position for the node we care about. 1122 IncompleteArrayType *NewIP = 1123 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1124 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1125 } 1126 1127 IncompleteArrayType *New = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1128 ASM, EltTypeQuals); 1129 1130 IncompleteArrayTypes.InsertNode(New, InsertPos); 1131 Types.push_back(New); 1132 return QualType(New, 0); 1133} 1134 1135/// getVectorType - Return the unique reference to a vector type of 1136/// the specified element type and size. VectorType must be a built-in type. 1137QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1138 BuiltinType *baseType; 1139 1140 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1141 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1142 1143 // Check if we've already instantiated a vector of this type. 1144 llvm::FoldingSetNodeID ID; 1145 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1146 void *InsertPos = 0; 1147 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1148 return QualType(VTP, 0); 1149 1150 // If the element type isn't canonical, this won't be a canonical type either, 1151 // so fill in the canonical type field. 1152 QualType Canonical; 1153 if (!vecType->isCanonical()) { 1154 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1155 1156 // Get the new insert position for the node we care about. 1157 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1158 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1159 } 1160 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1161 VectorTypes.InsertNode(New, InsertPos); 1162 Types.push_back(New); 1163 return QualType(New, 0); 1164} 1165 1166/// getExtVectorType - Return the unique reference to an extended vector type of 1167/// the specified element type and size. VectorType must be a built-in type. 1168QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1169 BuiltinType *baseType; 1170 1171 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1172 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1173 1174 // Check if we've already instantiated a vector of this type. 1175 llvm::FoldingSetNodeID ID; 1176 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1177 void *InsertPos = 0; 1178 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1179 return QualType(VTP, 0); 1180 1181 // If the element type isn't canonical, this won't be a canonical type either, 1182 // so fill in the canonical type field. 1183 QualType Canonical; 1184 if (!vecType->isCanonical()) { 1185 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1186 1187 // Get the new insert position for the node we care about. 1188 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1189 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1190 } 1191 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1192 VectorTypes.InsertNode(New, InsertPos); 1193 Types.push_back(New); 1194 return QualType(New, 0); 1195} 1196 1197/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1198/// 1199QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) { 1200 // Unique functions, to guarantee there is only one function of a particular 1201 // structure. 1202 llvm::FoldingSetNodeID ID; 1203 FunctionNoProtoType::Profile(ID, ResultTy); 1204 1205 void *InsertPos = 0; 1206 if (FunctionNoProtoType *FT = 1207 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1208 return QualType(FT, 0); 1209 1210 QualType Canonical; 1211 if (!ResultTy->isCanonical()) { 1212 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy)); 1213 1214 // Get the new insert position for the node we care about. 1215 FunctionNoProtoType *NewIP = 1216 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1217 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1218 } 1219 1220 FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical); 1221 Types.push_back(New); 1222 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1223 return QualType(New, 0); 1224} 1225 1226/// getFunctionType - Return a normal function type with a typed argument 1227/// list. isVariadic indicates whether the argument list includes '...'. 1228QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1229 unsigned NumArgs, bool isVariadic, 1230 unsigned TypeQuals) { 1231 // Unique functions, to guarantee there is only one function of a particular 1232 // structure. 1233 llvm::FoldingSetNodeID ID; 1234 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1235 TypeQuals); 1236 1237 void *InsertPos = 0; 1238 if (FunctionProtoType *FTP = 1239 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1240 return QualType(FTP, 0); 1241 1242 // Determine whether the type being created is already canonical or not. 1243 bool isCanonical = ResultTy->isCanonical(); 1244 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1245 if (!ArgArray[i]->isCanonical()) 1246 isCanonical = false; 1247 1248 // If this type isn't canonical, get the canonical version of it. 1249 QualType Canonical; 1250 if (!isCanonical) { 1251 llvm::SmallVector<QualType, 16> CanonicalArgs; 1252 CanonicalArgs.reserve(NumArgs); 1253 for (unsigned i = 0; i != NumArgs; ++i) 1254 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1255 1256 Canonical = getFunctionType(getCanonicalType(ResultTy), 1257 &CanonicalArgs[0], NumArgs, 1258 isVariadic, TypeQuals); 1259 1260 // Get the new insert position for the node we care about. 1261 FunctionProtoType *NewIP = 1262 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1263 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1264 } 1265 1266 // FunctionProtoType objects are allocated with extra bytes after them 1267 // for a variable size array (for parameter types) at the end of them. 1268 FunctionProtoType *FTP = 1269 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1270 NumArgs*sizeof(QualType), 8); 1271 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1272 TypeQuals, Canonical); 1273 Types.push_back(FTP); 1274 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1275 return QualType(FTP, 0); 1276} 1277 1278/// getTypeDeclType - Return the unique reference to the type for the 1279/// specified type declaration. 1280QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1281 assert(Decl && "Passed null for Decl param"); 1282 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1283 1284 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1285 return getTypedefType(Typedef); 1286 else if (isa<TemplateTypeParmDecl>(Decl)) { 1287 assert(false && "Template type parameter types are always available."); 1288 } else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1289 return getObjCInterfaceType(ObjCInterface); 1290 1291 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1292 if (PrevDecl) 1293 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1294 else 1295 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1296 } 1297 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1298 if (PrevDecl) 1299 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1300 else 1301 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1302 } 1303 else 1304 assert(false && "TypeDecl without a type?"); 1305 1306 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1307 return QualType(Decl->TypeForDecl, 0); 1308} 1309 1310/// getTypedefType - Return the unique reference to the type for the 1311/// specified typename decl. 1312QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1313 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1314 1315 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1316 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1317 Types.push_back(Decl->TypeForDecl); 1318 return QualType(Decl->TypeForDecl, 0); 1319} 1320 1321/// getObjCInterfaceType - Return the unique reference to the type for the 1322/// specified ObjC interface decl. 1323QualType ASTContext::getObjCInterfaceType(ObjCInterfaceDecl *Decl) { 1324 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1325 1326 Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, Decl); 1327 Types.push_back(Decl->TypeForDecl); 1328 return QualType(Decl->TypeForDecl, 0); 1329} 1330 1331/// buildObjCInterfaceType - Returns a new type for the interface 1332/// declaration, regardless. It also removes any previously built 1333/// record declaration so caller can rebuild it. 1334QualType ASTContext::buildObjCInterfaceType(ObjCInterfaceDecl *Decl) { 1335 const RecordDecl *&RD = ASTRecordForInterface[Decl]; 1336 if (RD) 1337 RD = 0; 1338 Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, Decl); 1339 Types.push_back(Decl->TypeForDecl); 1340 return QualType(Decl->TypeForDecl, 0); 1341} 1342 1343/// \brief Retrieve the template type parameter type for a template 1344/// parameter with the given depth, index, and (optionally) name. 1345QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1346 IdentifierInfo *Name) { 1347 llvm::FoldingSetNodeID ID; 1348 TemplateTypeParmType::Profile(ID, Depth, Index, Name); 1349 void *InsertPos = 0; 1350 TemplateTypeParmType *TypeParm 1351 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1352 1353 if (TypeParm) 1354 return QualType(TypeParm, 0); 1355 1356 if (Name) 1357 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, Name, 1358 getTemplateTypeParmType(Depth, Index)); 1359 else 1360 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index); 1361 1362 Types.push_back(TypeParm); 1363 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1364 1365 return QualType(TypeParm, 0); 1366} 1367 1368QualType 1369ASTContext::getTemplateSpecializationType(TemplateName Template, 1370 const TemplateArgument *Args, 1371 unsigned NumArgs, 1372 QualType Canon) { 1373 if (!Canon.isNull()) 1374 Canon = getCanonicalType(Canon); 1375 1376 llvm::FoldingSetNodeID ID; 1377 TemplateSpecializationType::Profile(ID, Template, Args, NumArgs); 1378 1379 void *InsertPos = 0; 1380 TemplateSpecializationType *Spec 1381 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1382 1383 if (Spec) 1384 return QualType(Spec, 0); 1385 1386 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1387 sizeof(TemplateArgument) * NumArgs), 1388 8); 1389 Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon); 1390 Types.push_back(Spec); 1391 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1392 1393 return QualType(Spec, 0); 1394} 1395 1396QualType 1397ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1398 QualType NamedType) { 1399 llvm::FoldingSetNodeID ID; 1400 QualifiedNameType::Profile(ID, NNS, NamedType); 1401 1402 void *InsertPos = 0; 1403 QualifiedNameType *T 1404 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1405 if (T) 1406 return QualType(T, 0); 1407 1408 T = new (*this) QualifiedNameType(NNS, NamedType, 1409 getCanonicalType(NamedType)); 1410 Types.push_back(T); 1411 QualifiedNameTypes.InsertNode(T, InsertPos); 1412 return QualType(T, 0); 1413} 1414 1415QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1416 const IdentifierInfo *Name, 1417 QualType Canon) { 1418 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1419 1420 if (Canon.isNull()) { 1421 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1422 if (CanonNNS != NNS) 1423 Canon = getTypenameType(CanonNNS, Name); 1424 } 1425 1426 llvm::FoldingSetNodeID ID; 1427 TypenameType::Profile(ID, NNS, Name); 1428 1429 void *InsertPos = 0; 1430 TypenameType *T 1431 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1432 if (T) 1433 return QualType(T, 0); 1434 1435 T = new (*this) TypenameType(NNS, Name, Canon); 1436 Types.push_back(T); 1437 TypenameTypes.InsertNode(T, InsertPos); 1438 return QualType(T, 0); 1439} 1440 1441/// CmpProtocolNames - Comparison predicate for sorting protocols 1442/// alphabetically. 1443static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1444 const ObjCProtocolDecl *RHS) { 1445 return LHS->getDeclName() < RHS->getDeclName(); 1446} 1447 1448static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1449 unsigned &NumProtocols) { 1450 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1451 1452 // Sort protocols, keyed by name. 1453 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1454 1455 // Remove duplicates. 1456 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1457 NumProtocols = ProtocolsEnd-Protocols; 1458} 1459 1460 1461/// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for 1462/// the given interface decl and the conforming protocol list. 1463QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 1464 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1465 // Sort the protocol list alphabetically to canonicalize it. 1466 SortAndUniqueProtocols(Protocols, NumProtocols); 1467 1468 llvm::FoldingSetNodeID ID; 1469 ObjCQualifiedInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1470 1471 void *InsertPos = 0; 1472 if (ObjCQualifiedInterfaceType *QT = 1473 ObjCQualifiedInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1474 return QualType(QT, 0); 1475 1476 // No Match; 1477 ObjCQualifiedInterfaceType *QType = 1478 new (*this,8) ObjCQualifiedInterfaceType(Decl, Protocols, NumProtocols); 1479 1480 Types.push_back(QType); 1481 ObjCQualifiedInterfaceTypes.InsertNode(QType, InsertPos); 1482 return QualType(QType, 0); 1483} 1484 1485/// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for the 'id' decl 1486/// and the conforming protocol list. 1487QualType ASTContext::getObjCQualifiedIdType(ObjCProtocolDecl **Protocols, 1488 unsigned NumProtocols) { 1489 // Sort the protocol list alphabetically to canonicalize it. 1490 SortAndUniqueProtocols(Protocols, NumProtocols); 1491 1492 llvm::FoldingSetNodeID ID; 1493 ObjCQualifiedIdType::Profile(ID, Protocols, NumProtocols); 1494 1495 void *InsertPos = 0; 1496 if (ObjCQualifiedIdType *QT = 1497 ObjCQualifiedIdTypes.FindNodeOrInsertPos(ID, InsertPos)) 1498 return QualType(QT, 0); 1499 1500 // No Match; 1501 ObjCQualifiedIdType *QType = 1502 new (*this,8) ObjCQualifiedIdType(Protocols, NumProtocols); 1503 Types.push_back(QType); 1504 ObjCQualifiedIdTypes.InsertNode(QType, InsertPos); 1505 return QualType(QType, 0); 1506} 1507 1508/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1509/// TypeOfExprType AST's (since expression's are never shared). For example, 1510/// multiple declarations that refer to "typeof(x)" all contain different 1511/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1512/// on canonical type's (which are always unique). 1513QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1514 QualType Canonical = getCanonicalType(tofExpr->getType()); 1515 TypeOfExprType *toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1516 Types.push_back(toe); 1517 return QualType(toe, 0); 1518} 1519 1520/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1521/// TypeOfType AST's. The only motivation to unique these nodes would be 1522/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1523/// an issue. This doesn't effect the type checker, since it operates 1524/// on canonical type's (which are always unique). 1525QualType ASTContext::getTypeOfType(QualType tofType) { 1526 QualType Canonical = getCanonicalType(tofType); 1527 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1528 Types.push_back(tot); 1529 return QualType(tot, 0); 1530} 1531 1532/// getTagDeclType - Return the unique reference to the type for the 1533/// specified TagDecl (struct/union/class/enum) decl. 1534QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1535 assert (Decl); 1536 return getTypeDeclType(Decl); 1537} 1538 1539/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1540/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1541/// needs to agree with the definition in <stddef.h>. 1542QualType ASTContext::getSizeType() const { 1543 return getFromTargetType(Target.getSizeType()); 1544} 1545 1546/// getSignedWCharType - Return the type of "signed wchar_t". 1547/// Used when in C++, as a GCC extension. 1548QualType ASTContext::getSignedWCharType() const { 1549 // FIXME: derive from "Target" ? 1550 return WCharTy; 1551} 1552 1553/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1554/// Used when in C++, as a GCC extension. 1555QualType ASTContext::getUnsignedWCharType() const { 1556 // FIXME: derive from "Target" ? 1557 return UnsignedIntTy; 1558} 1559 1560/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 1561/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 1562QualType ASTContext::getPointerDiffType() const { 1563 return getFromTargetType(Target.getPtrDiffType(0)); 1564} 1565 1566//===----------------------------------------------------------------------===// 1567// Type Operators 1568//===----------------------------------------------------------------------===// 1569 1570/// getCanonicalType - Return the canonical (structural) type corresponding to 1571/// the specified potentially non-canonical type. The non-canonical version 1572/// of a type may have many "decorated" versions of types. Decorators can 1573/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 1574/// to be free of any of these, allowing two canonical types to be compared 1575/// for exact equality with a simple pointer comparison. 1576QualType ASTContext::getCanonicalType(QualType T) { 1577 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 1578 1579 // If the result has type qualifiers, make sure to canonicalize them as well. 1580 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 1581 if (TypeQuals == 0) return CanType; 1582 1583 // If the type qualifiers are on an array type, get the canonical type of the 1584 // array with the qualifiers applied to the element type. 1585 ArrayType *AT = dyn_cast<ArrayType>(CanType); 1586 if (!AT) 1587 return CanType.getQualifiedType(TypeQuals); 1588 1589 // Get the canonical version of the element with the extra qualifiers on it. 1590 // This can recursively sink qualifiers through multiple levels of arrays. 1591 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 1592 NewEltTy = getCanonicalType(NewEltTy); 1593 1594 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1595 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 1596 CAT->getIndexTypeQualifier()); 1597 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 1598 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 1599 IAT->getIndexTypeQualifier()); 1600 1601 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 1602 return getDependentSizedArrayType(NewEltTy, DSAT->getSizeExpr(), 1603 DSAT->getSizeModifier(), 1604 DSAT->getIndexTypeQualifier()); 1605 1606 VariableArrayType *VAT = cast<VariableArrayType>(AT); 1607 return getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1608 VAT->getSizeModifier(), 1609 VAT->getIndexTypeQualifier()); 1610} 1611 1612NestedNameSpecifier * 1613ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 1614 if (!NNS) 1615 return 0; 1616 1617 switch (NNS->getKind()) { 1618 case NestedNameSpecifier::Identifier: 1619 // Canonicalize the prefix but keep the identifier the same. 1620 return NestedNameSpecifier::Create(*this, 1621 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 1622 NNS->getAsIdentifier()); 1623 1624 case NestedNameSpecifier::Namespace: 1625 // A namespace is canonical; build a nested-name-specifier with 1626 // this namespace and no prefix. 1627 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 1628 1629 case NestedNameSpecifier::TypeSpec: 1630 case NestedNameSpecifier::TypeSpecWithTemplate: { 1631 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 1632 NestedNameSpecifier *Prefix = 0; 1633 1634 // FIXME: This isn't the right check! 1635 if (T->isDependentType()) 1636 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 1637 1638 return NestedNameSpecifier::Create(*this, Prefix, 1639 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 1640 T.getTypePtr()); 1641 } 1642 1643 case NestedNameSpecifier::Global: 1644 // The global specifier is canonical and unique. 1645 return NNS; 1646 } 1647 1648 // Required to silence a GCC warning 1649 return 0; 1650} 1651 1652 1653const ArrayType *ASTContext::getAsArrayType(QualType T) { 1654 // Handle the non-qualified case efficiently. 1655 if (T.getCVRQualifiers() == 0) { 1656 // Handle the common positive case fast. 1657 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 1658 return AT; 1659 } 1660 1661 // Handle the common negative case fast, ignoring CVR qualifiers. 1662 QualType CType = T->getCanonicalTypeInternal(); 1663 1664 // Make sure to look through type qualifiers (like ExtQuals) for the negative 1665 // test. 1666 if (!isa<ArrayType>(CType) && 1667 !isa<ArrayType>(CType.getUnqualifiedType())) 1668 return 0; 1669 1670 // Apply any CVR qualifiers from the array type to the element type. This 1671 // implements C99 6.7.3p8: "If the specification of an array type includes 1672 // any type qualifiers, the element type is so qualified, not the array type." 1673 1674 // If we get here, we either have type qualifiers on the type, or we have 1675 // sugar such as a typedef in the way. If we have type qualifiers on the type 1676 // we must propagate them down into the elemeng type. 1677 unsigned CVRQuals = T.getCVRQualifiers(); 1678 unsigned AddrSpace = 0; 1679 Type *Ty = T.getTypePtr(); 1680 1681 // Rip through ExtQualType's and typedefs to get to a concrete type. 1682 while (1) { 1683 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 1684 AddrSpace = EXTQT->getAddressSpace(); 1685 Ty = EXTQT->getBaseType(); 1686 } else { 1687 T = Ty->getDesugaredType(); 1688 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 1689 break; 1690 CVRQuals |= T.getCVRQualifiers(); 1691 Ty = T.getTypePtr(); 1692 } 1693 } 1694 1695 // If we have a simple case, just return now. 1696 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 1697 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 1698 return ATy; 1699 1700 // Otherwise, we have an array and we have qualifiers on it. Push the 1701 // qualifiers into the array element type and return a new array type. 1702 // Get the canonical version of the element with the extra qualifiers on it. 1703 // This can recursively sink qualifiers through multiple levels of arrays. 1704 QualType NewEltTy = ATy->getElementType(); 1705 if (AddrSpace) 1706 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 1707 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 1708 1709 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 1710 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 1711 CAT->getSizeModifier(), 1712 CAT->getIndexTypeQualifier())); 1713 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 1714 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 1715 IAT->getSizeModifier(), 1716 IAT->getIndexTypeQualifier())); 1717 1718 if (const DependentSizedArrayType *DSAT 1719 = dyn_cast<DependentSizedArrayType>(ATy)) 1720 return cast<ArrayType>( 1721 getDependentSizedArrayType(NewEltTy, 1722 DSAT->getSizeExpr(), 1723 DSAT->getSizeModifier(), 1724 DSAT->getIndexTypeQualifier())); 1725 1726 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 1727 return cast<ArrayType>(getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1728 VAT->getSizeModifier(), 1729 VAT->getIndexTypeQualifier())); 1730} 1731 1732 1733/// getArrayDecayedType - Return the properly qualified result of decaying the 1734/// specified array type to a pointer. This operation is non-trivial when 1735/// handling typedefs etc. The canonical type of "T" must be an array type, 1736/// this returns a pointer to a properly qualified element of the array. 1737/// 1738/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 1739QualType ASTContext::getArrayDecayedType(QualType Ty) { 1740 // Get the element type with 'getAsArrayType' so that we don't lose any 1741 // typedefs in the element type of the array. This also handles propagation 1742 // of type qualifiers from the array type into the element type if present 1743 // (C99 6.7.3p8). 1744 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 1745 assert(PrettyArrayType && "Not an array type!"); 1746 1747 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 1748 1749 // int x[restrict 4] -> int *restrict 1750 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 1751} 1752 1753QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 1754 QualType ElemTy = VAT->getElementType(); 1755 1756 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 1757 return getBaseElementType(VAT); 1758 1759 return ElemTy; 1760} 1761 1762/// getFloatingRank - Return a relative rank for floating point types. 1763/// This routine will assert if passed a built-in type that isn't a float. 1764static FloatingRank getFloatingRank(QualType T) { 1765 if (const ComplexType *CT = T->getAsComplexType()) 1766 return getFloatingRank(CT->getElementType()); 1767 1768 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 1769 switch (T->getAsBuiltinType()->getKind()) { 1770 default: assert(0 && "getFloatingRank(): not a floating type"); 1771 case BuiltinType::Float: return FloatRank; 1772 case BuiltinType::Double: return DoubleRank; 1773 case BuiltinType::LongDouble: return LongDoubleRank; 1774 } 1775} 1776 1777/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 1778/// point or a complex type (based on typeDomain/typeSize). 1779/// 'typeDomain' is a real floating point or complex type. 1780/// 'typeSize' is a real floating point or complex type. 1781QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 1782 QualType Domain) const { 1783 FloatingRank EltRank = getFloatingRank(Size); 1784 if (Domain->isComplexType()) { 1785 switch (EltRank) { 1786 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1787 case FloatRank: return FloatComplexTy; 1788 case DoubleRank: return DoubleComplexTy; 1789 case LongDoubleRank: return LongDoubleComplexTy; 1790 } 1791 } 1792 1793 assert(Domain->isRealFloatingType() && "Unknown domain!"); 1794 switch (EltRank) { 1795 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1796 case FloatRank: return FloatTy; 1797 case DoubleRank: return DoubleTy; 1798 case LongDoubleRank: return LongDoubleTy; 1799 } 1800} 1801 1802/// getFloatingTypeOrder - Compare the rank of the two specified floating 1803/// point types, ignoring the domain of the type (i.e. 'double' == 1804/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 1805/// LHS < RHS, return -1. 1806int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 1807 FloatingRank LHSR = getFloatingRank(LHS); 1808 FloatingRank RHSR = getFloatingRank(RHS); 1809 1810 if (LHSR == RHSR) 1811 return 0; 1812 if (LHSR > RHSR) 1813 return 1; 1814 return -1; 1815} 1816 1817/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 1818/// routine will assert if passed a built-in type that isn't an integer or enum, 1819/// or if it is not canonicalized. 1820unsigned ASTContext::getIntegerRank(Type *T) { 1821 assert(T->isCanonical() && "T should be canonicalized"); 1822 if (EnumType* ET = dyn_cast<EnumType>(T)) 1823 T = ET->getDecl()->getIntegerType().getTypePtr(); 1824 1825 // There are two things which impact the integer rank: the width, and 1826 // the ordering of builtins. The builtin ordering is encoded in the 1827 // bottom three bits; the width is encoded in the bits above that. 1828 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 1829 return FWIT->getWidth() << 3; 1830 } 1831 1832 switch (cast<BuiltinType>(T)->getKind()) { 1833 default: assert(0 && "getIntegerRank(): not a built-in integer"); 1834 case BuiltinType::Bool: 1835 return 1 + (getIntWidth(BoolTy) << 3); 1836 case BuiltinType::Char_S: 1837 case BuiltinType::Char_U: 1838 case BuiltinType::SChar: 1839 case BuiltinType::UChar: 1840 return 2 + (getIntWidth(CharTy) << 3); 1841 case BuiltinType::Short: 1842 case BuiltinType::UShort: 1843 return 3 + (getIntWidth(ShortTy) << 3); 1844 case BuiltinType::Int: 1845 case BuiltinType::UInt: 1846 return 4 + (getIntWidth(IntTy) << 3); 1847 case BuiltinType::Long: 1848 case BuiltinType::ULong: 1849 return 5 + (getIntWidth(LongTy) << 3); 1850 case BuiltinType::LongLong: 1851 case BuiltinType::ULongLong: 1852 return 6 + (getIntWidth(LongLongTy) << 3); 1853 } 1854} 1855 1856/// getIntegerTypeOrder - Returns the highest ranked integer type: 1857/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 1858/// LHS < RHS, return -1. 1859int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 1860 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 1861 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 1862 if (LHSC == RHSC) return 0; 1863 1864 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 1865 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 1866 1867 unsigned LHSRank = getIntegerRank(LHSC); 1868 unsigned RHSRank = getIntegerRank(RHSC); 1869 1870 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 1871 if (LHSRank == RHSRank) return 0; 1872 return LHSRank > RHSRank ? 1 : -1; 1873 } 1874 1875 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 1876 if (LHSUnsigned) { 1877 // If the unsigned [LHS] type is larger, return it. 1878 if (LHSRank >= RHSRank) 1879 return 1; 1880 1881 // If the signed type can represent all values of the unsigned type, it 1882 // wins. Because we are dealing with 2's complement and types that are 1883 // powers of two larger than each other, this is always safe. 1884 return -1; 1885 } 1886 1887 // If the unsigned [RHS] type is larger, return it. 1888 if (RHSRank >= LHSRank) 1889 return -1; 1890 1891 // If the signed type can represent all values of the unsigned type, it 1892 // wins. Because we are dealing with 2's complement and types that are 1893 // powers of two larger than each other, this is always safe. 1894 return 1; 1895} 1896 1897// getCFConstantStringType - Return the type used for constant CFStrings. 1898QualType ASTContext::getCFConstantStringType() { 1899 if (!CFConstantStringTypeDecl) { 1900 CFConstantStringTypeDecl = 1901 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 1902 &Idents.get("NSConstantString")); 1903 QualType FieldTypes[4]; 1904 1905 // const int *isa; 1906 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 1907 // int flags; 1908 FieldTypes[1] = IntTy; 1909 // const char *str; 1910 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 1911 // long length; 1912 FieldTypes[3] = LongTy; 1913 1914 // Create fields 1915 for (unsigned i = 0; i < 4; ++i) { 1916 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 1917 SourceLocation(), 0, 1918 FieldTypes[i], /*BitWidth=*/0, 1919 /*Mutable=*/false); 1920 CFConstantStringTypeDecl->addDecl(Field); 1921 } 1922 1923 CFConstantStringTypeDecl->completeDefinition(*this); 1924 } 1925 1926 return getTagDeclType(CFConstantStringTypeDecl); 1927} 1928 1929QualType ASTContext::getObjCFastEnumerationStateType() 1930{ 1931 if (!ObjCFastEnumerationStateTypeDecl) { 1932 ObjCFastEnumerationStateTypeDecl = 1933 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 1934 &Idents.get("__objcFastEnumerationState")); 1935 1936 QualType FieldTypes[] = { 1937 UnsignedLongTy, 1938 getPointerType(ObjCIdType), 1939 getPointerType(UnsignedLongTy), 1940 getConstantArrayType(UnsignedLongTy, 1941 llvm::APInt(32, 5), ArrayType::Normal, 0) 1942 }; 1943 1944 for (size_t i = 0; i < 4; ++i) { 1945 FieldDecl *Field = FieldDecl::Create(*this, 1946 ObjCFastEnumerationStateTypeDecl, 1947 SourceLocation(), 0, 1948 FieldTypes[i], /*BitWidth=*/0, 1949 /*Mutable=*/false); 1950 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 1951 } 1952 1953 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 1954 } 1955 1956 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 1957} 1958 1959// This returns true if a type has been typedefed to BOOL: 1960// typedef <type> BOOL; 1961static bool isTypeTypedefedAsBOOL(QualType T) { 1962 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 1963 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 1964 return II->isStr("BOOL"); 1965 1966 return false; 1967} 1968 1969/// getObjCEncodingTypeSize returns size of type for objective-c encoding 1970/// purpose. 1971int ASTContext::getObjCEncodingTypeSize(QualType type) { 1972 uint64_t sz = getTypeSize(type); 1973 1974 // Make all integer and enum types at least as large as an int 1975 if (sz > 0 && type->isIntegralType()) 1976 sz = std::max(sz, getTypeSize(IntTy)); 1977 // Treat arrays as pointers, since that's how they're passed in. 1978 else if (type->isArrayType()) 1979 sz = getTypeSize(VoidPtrTy); 1980 return sz / getTypeSize(CharTy); 1981} 1982 1983/// getObjCEncodingForMethodDecl - Return the encoded type for this method 1984/// declaration. 1985void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 1986 std::string& S) { 1987 // FIXME: This is not very efficient. 1988 // Encode type qualifer, 'in', 'inout', etc. for the return type. 1989 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 1990 // Encode result type. 1991 getObjCEncodingForType(Decl->getResultType(), S); 1992 // Compute size of all parameters. 1993 // Start with computing size of a pointer in number of bytes. 1994 // FIXME: There might(should) be a better way of doing this computation! 1995 SourceLocation Loc; 1996 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 1997 // The first two arguments (self and _cmd) are pointers; account for 1998 // their size. 1999 int ParmOffset = 2 * PtrSize; 2000 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2001 E = Decl->param_end(); PI != E; ++PI) { 2002 QualType PType = (*PI)->getType(); 2003 int sz = getObjCEncodingTypeSize(PType); 2004 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2005 ParmOffset += sz; 2006 } 2007 S += llvm::utostr(ParmOffset); 2008 S += "@0:"; 2009 S += llvm::utostr(PtrSize); 2010 2011 // Argument types. 2012 ParmOffset = 2 * PtrSize; 2013 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2014 E = Decl->param_end(); PI != E; ++PI) { 2015 ParmVarDecl *PVDecl = *PI; 2016 QualType PType = PVDecl->getOriginalType(); 2017 if (const ArrayType *AT = 2018 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) 2019 // Use array's original type only if it has known number of 2020 // elements. 2021 if (!dyn_cast<ConstantArrayType>(AT)) 2022 PType = PVDecl->getType(); 2023 // Process argument qualifiers for user supplied arguments; such as, 2024 // 'in', 'inout', etc. 2025 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2026 getObjCEncodingForType(PType, S); 2027 S += llvm::utostr(ParmOffset); 2028 ParmOffset += getObjCEncodingTypeSize(PType); 2029 } 2030} 2031 2032/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2033/// property declaration. If non-NULL, Container must be either an 2034/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2035/// NULL when getting encodings for protocol properties. 2036/// Property attributes are stored as a comma-delimited C string. The simple 2037/// attributes readonly and bycopy are encoded as single characters. The 2038/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2039/// encoded as single characters, followed by an identifier. Property types 2040/// are also encoded as a parametrized attribute. The characters used to encode 2041/// these attributes are defined by the following enumeration: 2042/// @code 2043/// enum PropertyAttributes { 2044/// kPropertyReadOnly = 'R', // property is read-only. 2045/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2046/// kPropertyByref = '&', // property is a reference to the value last assigned 2047/// kPropertyDynamic = 'D', // property is dynamic 2048/// kPropertyGetter = 'G', // followed by getter selector name 2049/// kPropertySetter = 'S', // followed by setter selector name 2050/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2051/// kPropertyType = 't' // followed by old-style type encoding. 2052/// kPropertyWeak = 'W' // 'weak' property 2053/// kPropertyStrong = 'P' // property GC'able 2054/// kPropertyNonAtomic = 'N' // property non-atomic 2055/// }; 2056/// @endcode 2057void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2058 const Decl *Container, 2059 std::string& S) { 2060 // Collect information from the property implementation decl(s). 2061 bool Dynamic = false; 2062 ObjCPropertyImplDecl *SynthesizePID = 0; 2063 2064 // FIXME: Duplicated code due to poor abstraction. 2065 if (Container) { 2066 if (const ObjCCategoryImplDecl *CID = 2067 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2068 for (ObjCCategoryImplDecl::propimpl_iterator 2069 i = CID->propimpl_begin(), e = CID->propimpl_end(); i != e; ++i) { 2070 ObjCPropertyImplDecl *PID = *i; 2071 if (PID->getPropertyDecl() == PD) { 2072 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2073 Dynamic = true; 2074 } else { 2075 SynthesizePID = PID; 2076 } 2077 } 2078 } 2079 } else { 2080 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2081 for (ObjCCategoryImplDecl::propimpl_iterator 2082 i = OID->propimpl_begin(), e = OID->propimpl_end(); i != e; ++i) { 2083 ObjCPropertyImplDecl *PID = *i; 2084 if (PID->getPropertyDecl() == PD) { 2085 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2086 Dynamic = true; 2087 } else { 2088 SynthesizePID = PID; 2089 } 2090 } 2091 } 2092 } 2093 } 2094 2095 // FIXME: This is not very efficient. 2096 S = "T"; 2097 2098 // Encode result type. 2099 // GCC has some special rules regarding encoding of properties which 2100 // closely resembles encoding of ivars. 2101 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, NULL, 2102 true /* outermost type */, 2103 true /* encoding for property */); 2104 2105 if (PD->isReadOnly()) { 2106 S += ",R"; 2107 } else { 2108 switch (PD->getSetterKind()) { 2109 case ObjCPropertyDecl::Assign: break; 2110 case ObjCPropertyDecl::Copy: S += ",C"; break; 2111 case ObjCPropertyDecl::Retain: S += ",&"; break; 2112 } 2113 } 2114 2115 // It really isn't clear at all what this means, since properties 2116 // are "dynamic by default". 2117 if (Dynamic) 2118 S += ",D"; 2119 2120 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2121 S += ",N"; 2122 2123 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2124 S += ",G"; 2125 S += PD->getGetterName().getAsString(); 2126 } 2127 2128 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2129 S += ",S"; 2130 S += PD->getSetterName().getAsString(); 2131 } 2132 2133 if (SynthesizePID) { 2134 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2135 S += ",V"; 2136 S += OID->getNameAsString(); 2137 } 2138 2139 // FIXME: OBJCGC: weak & strong 2140} 2141 2142/// getLegacyIntegralTypeEncoding - 2143/// Another legacy compatibility encoding: 32-bit longs are encoded as 2144/// 'l' or 'L' , but not always. For typedefs, we need to use 2145/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2146/// 2147void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2148 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 2149 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2150 if (BT->getKind() == BuiltinType::ULong && 2151 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2152 PointeeTy = UnsignedIntTy; 2153 else 2154 if (BT->getKind() == BuiltinType::Long && 2155 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2156 PointeeTy = IntTy; 2157 } 2158 } 2159} 2160 2161void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2162 FieldDecl *Field) const { 2163 // We follow the behavior of gcc, expanding structures which are 2164 // directly pointed to, and expanding embedded structures. Note that 2165 // these rules are sufficient to prevent recursive encoding of the 2166 // same type. 2167 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2168 true /* outermost type */); 2169} 2170 2171static void EncodeBitField(const ASTContext *Context, std::string& S, 2172 FieldDecl *FD) { 2173 const Expr *E = FD->getBitWidth(); 2174 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2175 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2176 unsigned N = E->getIntegerConstantExprValue(*Ctx).getZExtValue(); 2177 S += 'b'; 2178 S += llvm::utostr(N); 2179} 2180 2181void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2182 bool ExpandPointedToStructures, 2183 bool ExpandStructures, 2184 FieldDecl *FD, 2185 bool OutermostType, 2186 bool EncodingProperty) const { 2187 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2188 if (FD && FD->isBitField()) { 2189 EncodeBitField(this, S, FD); 2190 } 2191 else { 2192 char encoding; 2193 switch (BT->getKind()) { 2194 default: assert(0 && "Unhandled builtin type kind"); 2195 case BuiltinType::Void: encoding = 'v'; break; 2196 case BuiltinType::Bool: encoding = 'B'; break; 2197 case BuiltinType::Char_U: 2198 case BuiltinType::UChar: encoding = 'C'; break; 2199 case BuiltinType::UShort: encoding = 'S'; break; 2200 case BuiltinType::UInt: encoding = 'I'; break; 2201 case BuiltinType::ULong: 2202 encoding = 2203 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2204 break; 2205 case BuiltinType::ULongLong: encoding = 'Q'; break; 2206 case BuiltinType::Char_S: 2207 case BuiltinType::SChar: encoding = 'c'; break; 2208 case BuiltinType::Short: encoding = 's'; break; 2209 case BuiltinType::Int: encoding = 'i'; break; 2210 case BuiltinType::Long: 2211 encoding = 2212 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2213 break; 2214 case BuiltinType::LongLong: encoding = 'q'; break; 2215 case BuiltinType::Float: encoding = 'f'; break; 2216 case BuiltinType::Double: encoding = 'd'; break; 2217 case BuiltinType::LongDouble: encoding = 'd'; break; 2218 } 2219 2220 S += encoding; 2221 } 2222 } 2223 else if (T->isObjCQualifiedIdType()) { 2224 getObjCEncodingForTypeImpl(getObjCIdType(), S, 2225 ExpandPointedToStructures, 2226 ExpandStructures, FD); 2227 if (FD || EncodingProperty) { 2228 // Note that we do extended encoding of protocol qualifer list 2229 // Only when doing ivar or property encoding. 2230 const ObjCQualifiedIdType *QIDT = T->getAsObjCQualifiedIdType(); 2231 S += '"'; 2232 for (unsigned i =0; i < QIDT->getNumProtocols(); i++) { 2233 ObjCProtocolDecl *Proto = QIDT->getProtocols(i); 2234 S += '<'; 2235 S += Proto->getNameAsString(); 2236 S += '>'; 2237 } 2238 S += '"'; 2239 } 2240 return; 2241 } 2242 else if (const PointerType *PT = T->getAsPointerType()) { 2243 QualType PointeeTy = PT->getPointeeType(); 2244 bool isReadOnly = false; 2245 // For historical/compatibility reasons, the read-only qualifier of the 2246 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2247 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2248 // Also, do not emit the 'r' for anything but the outermost type! 2249 if (dyn_cast<TypedefType>(T.getTypePtr())) { 2250 if (OutermostType && T.isConstQualified()) { 2251 isReadOnly = true; 2252 S += 'r'; 2253 } 2254 } 2255 else if (OutermostType) { 2256 QualType P = PointeeTy; 2257 while (P->getAsPointerType()) 2258 P = P->getAsPointerType()->getPointeeType(); 2259 if (P.isConstQualified()) { 2260 isReadOnly = true; 2261 S += 'r'; 2262 } 2263 } 2264 if (isReadOnly) { 2265 // Another legacy compatibility encoding. Some ObjC qualifier and type 2266 // combinations need to be rearranged. 2267 // Rewrite "in const" from "nr" to "rn" 2268 const char * s = S.c_str(); 2269 int len = S.length(); 2270 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2271 std::string replace = "rn"; 2272 S.replace(S.end()-2, S.end(), replace); 2273 } 2274 } 2275 if (isObjCIdStructType(PointeeTy)) { 2276 S += '@'; 2277 return; 2278 } 2279 else if (PointeeTy->isObjCInterfaceType()) { 2280 if (!EncodingProperty && 2281 isa<TypedefType>(PointeeTy.getTypePtr())) { 2282 // Another historical/compatibility reason. 2283 // We encode the underlying type which comes out as 2284 // {...}; 2285 S += '^'; 2286 getObjCEncodingForTypeImpl(PointeeTy, S, 2287 false, ExpandPointedToStructures, 2288 NULL); 2289 return; 2290 } 2291 S += '@'; 2292 if (FD || EncodingProperty) { 2293 const ObjCInterfaceType *OIT = 2294 PointeeTy.getUnqualifiedType()->getAsObjCInterfaceType(); 2295 ObjCInterfaceDecl *OI = OIT->getDecl(); 2296 S += '"'; 2297 S += OI->getNameAsCString(); 2298 for (unsigned i =0; i < OIT->getNumProtocols(); i++) { 2299 ObjCProtocolDecl *Proto = OIT->getProtocol(i); 2300 S += '<'; 2301 S += Proto->getNameAsString(); 2302 S += '>'; 2303 } 2304 S += '"'; 2305 } 2306 return; 2307 } else if (isObjCClassStructType(PointeeTy)) { 2308 S += '#'; 2309 return; 2310 } else if (isObjCSelType(PointeeTy)) { 2311 S += ':'; 2312 return; 2313 } 2314 2315 if (PointeeTy->isCharType()) { 2316 // char pointer types should be encoded as '*' unless it is a 2317 // type that has been typedef'd to 'BOOL'. 2318 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2319 S += '*'; 2320 return; 2321 } 2322 } 2323 2324 S += '^'; 2325 getLegacyIntegralTypeEncoding(PointeeTy); 2326 2327 getObjCEncodingForTypeImpl(PointeeTy, S, 2328 false, ExpandPointedToStructures, 2329 NULL); 2330 } else if (const ArrayType *AT = 2331 // Ignore type qualifiers etc. 2332 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2333 if (isa<IncompleteArrayType>(AT)) { 2334 // Incomplete arrays are encoded as a pointer to the array element. 2335 S += '^'; 2336 2337 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2338 false, ExpandStructures, FD); 2339 } else { 2340 S += '['; 2341 2342 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2343 S += llvm::utostr(CAT->getSize().getZExtValue()); 2344 else { 2345 //Variable length arrays are encoded as a regular array with 0 elements. 2346 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2347 S += '0'; 2348 } 2349 2350 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2351 false, ExpandStructures, FD); 2352 S += ']'; 2353 } 2354 } else if (T->getAsFunctionType()) { 2355 S += '?'; 2356 } else if (const RecordType *RTy = T->getAsRecordType()) { 2357 RecordDecl *RDecl = RTy->getDecl(); 2358 S += RDecl->isUnion() ? '(' : '{'; 2359 // Anonymous structures print as '?' 2360 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2361 S += II->getName(); 2362 } else { 2363 S += '?'; 2364 } 2365 if (ExpandStructures) { 2366 S += '='; 2367 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 2368 FieldEnd = RDecl->field_end(); 2369 Field != FieldEnd; ++Field) { 2370 if (FD) { 2371 S += '"'; 2372 S += Field->getNameAsString(); 2373 S += '"'; 2374 } 2375 2376 // Special case bit-fields. 2377 if (Field->isBitField()) { 2378 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2379 (*Field)); 2380 } else { 2381 QualType qt = Field->getType(); 2382 getLegacyIntegralTypeEncoding(qt); 2383 getObjCEncodingForTypeImpl(qt, S, false, true, 2384 FD); 2385 } 2386 } 2387 } 2388 S += RDecl->isUnion() ? ')' : '}'; 2389 } else if (T->isEnumeralType()) { 2390 if (FD && FD->isBitField()) 2391 EncodeBitField(this, S, FD); 2392 else 2393 S += 'i'; 2394 } else if (T->isBlockPointerType()) { 2395 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2396 } else if (T->isObjCInterfaceType()) { 2397 // @encode(class_name) 2398 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2399 S += '{'; 2400 const IdentifierInfo *II = OI->getIdentifier(); 2401 S += II->getName(); 2402 S += '='; 2403 llvm::SmallVector<FieldDecl*, 32> RecFields; 2404 CollectObjCIvars(OI, RecFields); 2405 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2406 if (RecFields[i]->isBitField()) 2407 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2408 RecFields[i]); 2409 else 2410 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2411 FD); 2412 } 2413 S += '}'; 2414 } 2415 else 2416 assert(0 && "@encode for type not implemented!"); 2417} 2418 2419void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2420 std::string& S) const { 2421 if (QT & Decl::OBJC_TQ_In) 2422 S += 'n'; 2423 if (QT & Decl::OBJC_TQ_Inout) 2424 S += 'N'; 2425 if (QT & Decl::OBJC_TQ_Out) 2426 S += 'o'; 2427 if (QT & Decl::OBJC_TQ_Bycopy) 2428 S += 'O'; 2429 if (QT & Decl::OBJC_TQ_Byref) 2430 S += 'R'; 2431 if (QT & Decl::OBJC_TQ_Oneway) 2432 S += 'V'; 2433} 2434 2435void ASTContext::setBuiltinVaListType(QualType T) 2436{ 2437 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2438 2439 BuiltinVaListType = T; 2440} 2441 2442void ASTContext::setObjCIdType(TypedefDecl *TD) 2443{ 2444 ObjCIdType = getTypedefType(TD); 2445 2446 // typedef struct objc_object *id; 2447 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2448 // User error - caller will issue diagnostics. 2449 if (!ptr) 2450 return; 2451 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2452 // User error - caller will issue diagnostics. 2453 if (!rec) 2454 return; 2455 IdStructType = rec; 2456} 2457 2458void ASTContext::setObjCSelType(TypedefDecl *TD) 2459{ 2460 ObjCSelType = getTypedefType(TD); 2461 2462 // typedef struct objc_selector *SEL; 2463 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2464 if (!ptr) 2465 return; 2466 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2467 if (!rec) 2468 return; 2469 SelStructType = rec; 2470} 2471 2472void ASTContext::setObjCProtoType(QualType QT) 2473{ 2474 ObjCProtoType = QT; 2475} 2476 2477void ASTContext::setObjCClassType(TypedefDecl *TD) 2478{ 2479 ObjCClassType = getTypedefType(TD); 2480 2481 // typedef struct objc_class *Class; 2482 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2483 assert(ptr && "'Class' incorrectly typed"); 2484 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2485 assert(rec && "'Class' incorrectly typed"); 2486 ClassStructType = rec; 2487} 2488 2489void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 2490 assert(ObjCConstantStringType.isNull() && 2491 "'NSConstantString' type already set!"); 2492 2493 ObjCConstantStringType = getObjCInterfaceType(Decl); 2494} 2495 2496/// \brief Retrieve the template name that represents a qualified 2497/// template name such as \c std::vector. 2498TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 2499 bool TemplateKeyword, 2500 TemplateDecl *Template) { 2501 llvm::FoldingSetNodeID ID; 2502 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 2503 2504 void *InsertPos = 0; 2505 QualifiedTemplateName *QTN = 2506 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2507 if (!QTN) { 2508 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 2509 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 2510 } 2511 2512 return TemplateName(QTN); 2513} 2514 2515/// \brief Retrieve the template name that represents a dependent 2516/// template name such as \c MetaFun::template apply. 2517TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 2518 const IdentifierInfo *Name) { 2519 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 2520 2521 llvm::FoldingSetNodeID ID; 2522 DependentTemplateName::Profile(ID, NNS, Name); 2523 2524 void *InsertPos = 0; 2525 DependentTemplateName *QTN = 2526 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2527 2528 if (QTN) 2529 return TemplateName(QTN); 2530 2531 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2532 if (CanonNNS == NNS) { 2533 QTN = new (*this,4) DependentTemplateName(NNS, Name); 2534 } else { 2535 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 2536 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 2537 } 2538 2539 DependentTemplateNames.InsertNode(QTN, InsertPos); 2540 return TemplateName(QTN); 2541} 2542 2543/// getFromTargetType - Given one of the integer types provided by 2544/// TargetInfo, produce the corresponding type. The unsigned @p Type 2545/// is actually a value of type @c TargetInfo::IntType. 2546QualType ASTContext::getFromTargetType(unsigned Type) const { 2547 switch (Type) { 2548 case TargetInfo::NoInt: return QualType(); 2549 case TargetInfo::SignedShort: return ShortTy; 2550 case TargetInfo::UnsignedShort: return UnsignedShortTy; 2551 case TargetInfo::SignedInt: return IntTy; 2552 case TargetInfo::UnsignedInt: return UnsignedIntTy; 2553 case TargetInfo::SignedLong: return LongTy; 2554 case TargetInfo::UnsignedLong: return UnsignedLongTy; 2555 case TargetInfo::SignedLongLong: return LongLongTy; 2556 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 2557 } 2558 2559 assert(false && "Unhandled TargetInfo::IntType value"); 2560 return QualType(); 2561} 2562 2563//===----------------------------------------------------------------------===// 2564// Type Predicates. 2565//===----------------------------------------------------------------------===// 2566 2567/// isObjCNSObjectType - Return true if this is an NSObject object using 2568/// NSObject attribute on a c-style pointer type. 2569/// FIXME - Make it work directly on types. 2570/// 2571bool ASTContext::isObjCNSObjectType(QualType Ty) const { 2572 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2573 if (TypedefDecl *TD = TDT->getDecl()) 2574 if (TD->getAttr<ObjCNSObjectAttr>()) 2575 return true; 2576 } 2577 return false; 2578} 2579 2580/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 2581/// to an object type. This includes "id" and "Class" (two 'special' pointers 2582/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 2583/// ID type). 2584bool ASTContext::isObjCObjectPointerType(QualType Ty) const { 2585 if (Ty->isObjCQualifiedIdType()) 2586 return true; 2587 2588 // Blocks are objects. 2589 if (Ty->isBlockPointerType()) 2590 return true; 2591 2592 // All other object types are pointers. 2593 if (!Ty->isPointerType()) 2594 return false; 2595 2596 // Check to see if this is 'id' or 'Class', both of which are typedefs for 2597 // pointer types. This looks for the typedef specifically, not for the 2598 // underlying type. 2599 if (Ty.getUnqualifiedType() == getObjCIdType() || 2600 Ty.getUnqualifiedType() == getObjCClassType()) 2601 return true; 2602 2603 // If this a pointer to an interface (e.g. NSString*), it is ok. 2604 if (Ty->getAsPointerType()->getPointeeType()->isObjCInterfaceType()) 2605 return true; 2606 2607 // If is has NSObject attribute, OK as well. 2608 return isObjCNSObjectType(Ty); 2609} 2610 2611/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 2612/// garbage collection attribute. 2613/// 2614QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 2615 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 2616 if (getLangOptions().ObjC1 && 2617 getLangOptions().getGCMode() != LangOptions::NonGC) { 2618 GCAttrs = Ty.getObjCGCAttr(); 2619 // Default behavious under objective-c's gc is for objective-c pointers 2620 // (or pointers to them) be treated as though they were declared 2621 // as __strong. 2622 if (GCAttrs == QualType::GCNone) { 2623 if (isObjCObjectPointerType(Ty)) 2624 GCAttrs = QualType::Strong; 2625 else if (Ty->isPointerType()) 2626 return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType()); 2627 } 2628 } 2629 return GCAttrs; 2630} 2631 2632//===----------------------------------------------------------------------===// 2633// Type Compatibility Testing 2634//===----------------------------------------------------------------------===// 2635 2636/// typesAreBlockCompatible - This routine is called when comparing two 2637/// block types. Types must be strictly compatible here. For example, 2638/// C unfortunately doesn't produce an error for the following: 2639/// 2640/// int (*emptyArgFunc)(); 2641/// int (*intArgList)(int) = emptyArgFunc; 2642/// 2643/// For blocks, we will produce an error for the following (similar to C++): 2644/// 2645/// int (^emptyArgBlock)(); 2646/// int (^intArgBlock)(int) = emptyArgBlock; 2647/// 2648/// FIXME: When the dust settles on this integration, fold this into mergeTypes. 2649/// 2650bool ASTContext::typesAreBlockCompatible(QualType lhs, QualType rhs) { 2651 const FunctionType *lbase = lhs->getAsFunctionType(); 2652 const FunctionType *rbase = rhs->getAsFunctionType(); 2653 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 2654 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 2655 if (lproto && rproto) 2656 return !mergeTypes(lhs, rhs).isNull(); 2657 return false; 2658} 2659 2660/// areCompatVectorTypes - Return true if the two specified vector types are 2661/// compatible. 2662static bool areCompatVectorTypes(const VectorType *LHS, 2663 const VectorType *RHS) { 2664 assert(LHS->isCanonical() && RHS->isCanonical()); 2665 return LHS->getElementType() == RHS->getElementType() && 2666 LHS->getNumElements() == RHS->getNumElements(); 2667} 2668 2669/// canAssignObjCInterfaces - Return true if the two interface types are 2670/// compatible for assignment from RHS to LHS. This handles validation of any 2671/// protocol qualifiers on the LHS or RHS. 2672/// 2673bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 2674 const ObjCInterfaceType *RHS) { 2675 // Verify that the base decls are compatible: the RHS must be a subclass of 2676 // the LHS. 2677 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 2678 return false; 2679 2680 // RHS must have a superset of the protocols in the LHS. If the LHS is not 2681 // protocol qualified at all, then we are good. 2682 if (!isa<ObjCQualifiedInterfaceType>(LHS)) 2683 return true; 2684 2685 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 2686 // isn't a superset. 2687 if (!isa<ObjCQualifiedInterfaceType>(RHS)) 2688 return true; // FIXME: should return false! 2689 2690 // Finally, we must have two protocol-qualified interfaces. 2691 const ObjCQualifiedInterfaceType *LHSP =cast<ObjCQualifiedInterfaceType>(LHS); 2692 const ObjCQualifiedInterfaceType *RHSP =cast<ObjCQualifiedInterfaceType>(RHS); 2693 2694 // All LHS protocols must have a presence on the RHS. 2695 assert(LHSP->qual_begin() != LHSP->qual_end() && "Empty LHS protocol list?"); 2696 2697 for (ObjCQualifiedInterfaceType::qual_iterator LHSPI = LHSP->qual_begin(), 2698 LHSPE = LHSP->qual_end(); 2699 LHSPI != LHSPE; LHSPI++) { 2700 bool RHSImplementsProtocol = false; 2701 2702 // If the RHS doesn't implement the protocol on the left, the types 2703 // are incompatible. 2704 for (ObjCQualifiedInterfaceType::qual_iterator RHSPI = RHSP->qual_begin(), 2705 RHSPE = RHSP->qual_end(); 2706 !RHSImplementsProtocol && (RHSPI != RHSPE); RHSPI++) { 2707 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) 2708 RHSImplementsProtocol = true; 2709 } 2710 // FIXME: For better diagnostics, consider passing back the protocol name. 2711 if (!RHSImplementsProtocol) 2712 return false; 2713 } 2714 // The RHS implements all protocols listed on the LHS. 2715 return true; 2716} 2717 2718bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 2719 // get the "pointed to" types 2720 const PointerType *LHSPT = LHS->getAsPointerType(); 2721 const PointerType *RHSPT = RHS->getAsPointerType(); 2722 2723 if (!LHSPT || !RHSPT) 2724 return false; 2725 2726 QualType lhptee = LHSPT->getPointeeType(); 2727 QualType rhptee = RHSPT->getPointeeType(); 2728 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2729 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2730 // ID acts sort of like void* for ObjC interfaces 2731 if (LHSIface && isObjCIdStructType(rhptee)) 2732 return true; 2733 if (RHSIface && isObjCIdStructType(lhptee)) 2734 return true; 2735 if (!LHSIface || !RHSIface) 2736 return false; 2737 return canAssignObjCInterfaces(LHSIface, RHSIface) || 2738 canAssignObjCInterfaces(RHSIface, LHSIface); 2739} 2740 2741/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 2742/// both shall have the identically qualified version of a compatible type. 2743/// C99 6.2.7p1: Two types have compatible types if their types are the 2744/// same. See 6.7.[2,3,5] for additional rules. 2745bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 2746 return !mergeTypes(LHS, RHS).isNull(); 2747} 2748 2749QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 2750 const FunctionType *lbase = lhs->getAsFunctionType(); 2751 const FunctionType *rbase = rhs->getAsFunctionType(); 2752 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 2753 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 2754 bool allLTypes = true; 2755 bool allRTypes = true; 2756 2757 // Check return type 2758 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 2759 if (retType.isNull()) return QualType(); 2760 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 2761 allLTypes = false; 2762 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 2763 allRTypes = false; 2764 2765 if (lproto && rproto) { // two C99 style function prototypes 2766 unsigned lproto_nargs = lproto->getNumArgs(); 2767 unsigned rproto_nargs = rproto->getNumArgs(); 2768 2769 // Compatible functions must have the same number of arguments 2770 if (lproto_nargs != rproto_nargs) 2771 return QualType(); 2772 2773 // Variadic and non-variadic functions aren't compatible 2774 if (lproto->isVariadic() != rproto->isVariadic()) 2775 return QualType(); 2776 2777 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 2778 return QualType(); 2779 2780 // Check argument compatibility 2781 llvm::SmallVector<QualType, 10> types; 2782 for (unsigned i = 0; i < lproto_nargs; i++) { 2783 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 2784 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 2785 QualType argtype = mergeTypes(largtype, rargtype); 2786 if (argtype.isNull()) return QualType(); 2787 types.push_back(argtype); 2788 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 2789 allLTypes = false; 2790 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 2791 allRTypes = false; 2792 } 2793 if (allLTypes) return lhs; 2794 if (allRTypes) return rhs; 2795 return getFunctionType(retType, types.begin(), types.size(), 2796 lproto->isVariadic(), lproto->getTypeQuals()); 2797 } 2798 2799 if (lproto) allRTypes = false; 2800 if (rproto) allLTypes = false; 2801 2802 const FunctionProtoType *proto = lproto ? lproto : rproto; 2803 if (proto) { 2804 if (proto->isVariadic()) return QualType(); 2805 // Check that the types are compatible with the types that 2806 // would result from default argument promotions (C99 6.7.5.3p15). 2807 // The only types actually affected are promotable integer 2808 // types and floats, which would be passed as a different 2809 // type depending on whether the prototype is visible. 2810 unsigned proto_nargs = proto->getNumArgs(); 2811 for (unsigned i = 0; i < proto_nargs; ++i) { 2812 QualType argTy = proto->getArgType(i); 2813 if (argTy->isPromotableIntegerType() || 2814 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 2815 return QualType(); 2816 } 2817 2818 if (allLTypes) return lhs; 2819 if (allRTypes) return rhs; 2820 return getFunctionType(retType, proto->arg_type_begin(), 2821 proto->getNumArgs(), lproto->isVariadic(), 2822 lproto->getTypeQuals()); 2823 } 2824 2825 if (allLTypes) return lhs; 2826 if (allRTypes) return rhs; 2827 return getFunctionNoProtoType(retType); 2828} 2829 2830QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 2831 // C++ [expr]: If an expression initially has the type "reference to T", the 2832 // type is adjusted to "T" prior to any further analysis, the expression 2833 // designates the object or function denoted by the reference, and the 2834 // expression is an lvalue unless the reference is an rvalue reference and 2835 // the expression is a function call (possibly inside parentheses). 2836 // FIXME: C++ shouldn't be going through here! The rules are different 2837 // enough that they should be handled separately. 2838 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 2839 // shouldn't be going through here! 2840 if (const ReferenceType *RT = LHS->getAsReferenceType()) 2841 LHS = RT->getPointeeType(); 2842 if (const ReferenceType *RT = RHS->getAsReferenceType()) 2843 RHS = RT->getPointeeType(); 2844 2845 QualType LHSCan = getCanonicalType(LHS), 2846 RHSCan = getCanonicalType(RHS); 2847 2848 // If two types are identical, they are compatible. 2849 if (LHSCan == RHSCan) 2850 return LHS; 2851 2852 // If the qualifiers are different, the types aren't compatible 2853 // Note that we handle extended qualifiers later, in the 2854 // case for ExtQualType. 2855 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 2856 return QualType(); 2857 2858 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 2859 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 2860 2861 // We want to consider the two function types to be the same for these 2862 // comparisons, just force one to the other. 2863 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 2864 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 2865 2866 // Same as above for arrays 2867 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 2868 LHSClass = Type::ConstantArray; 2869 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 2870 RHSClass = Type::ConstantArray; 2871 2872 // Canonicalize ExtVector -> Vector. 2873 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 2874 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 2875 2876 // Consider qualified interfaces and interfaces the same. 2877 if (LHSClass == Type::ObjCQualifiedInterface) LHSClass = Type::ObjCInterface; 2878 if (RHSClass == Type::ObjCQualifiedInterface) RHSClass = Type::ObjCInterface; 2879 2880 // If the canonical type classes don't match. 2881 if (LHSClass != RHSClass) { 2882 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2883 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2884 2885 // ID acts sort of like void* for ObjC interfaces 2886 if (LHSIface && isObjCIdStructType(RHS)) 2887 return LHS; 2888 if (RHSIface && isObjCIdStructType(LHS)) 2889 return RHS; 2890 2891 // ID is compatible with all qualified id types. 2892 if (LHS->isObjCQualifiedIdType()) { 2893 if (const PointerType *PT = RHS->getAsPointerType()) { 2894 QualType pType = PT->getPointeeType(); 2895 if (isObjCIdStructType(pType)) 2896 return LHS; 2897 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 2898 // Unfortunately, this API is part of Sema (which we don't have access 2899 // to. Need to refactor. The following check is insufficient, since we 2900 // need to make sure the class implements the protocol. 2901 if (pType->isObjCInterfaceType()) 2902 return LHS; 2903 } 2904 } 2905 if (RHS->isObjCQualifiedIdType()) { 2906 if (const PointerType *PT = LHS->getAsPointerType()) { 2907 QualType pType = PT->getPointeeType(); 2908 if (isObjCIdStructType(pType)) 2909 return RHS; 2910 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 2911 // Unfortunately, this API is part of Sema (which we don't have access 2912 // to. Need to refactor. The following check is insufficient, since we 2913 // need to make sure the class implements the protocol. 2914 if (pType->isObjCInterfaceType()) 2915 return RHS; 2916 } 2917 } 2918 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 2919 // a signed integer type, or an unsigned integer type. 2920 if (const EnumType* ETy = LHS->getAsEnumType()) { 2921 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 2922 return RHS; 2923 } 2924 if (const EnumType* ETy = RHS->getAsEnumType()) { 2925 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 2926 return LHS; 2927 } 2928 2929 return QualType(); 2930 } 2931 2932 // The canonical type classes match. 2933 switch (LHSClass) { 2934#define TYPE(Class, Base) 2935#define ABSTRACT_TYPE(Class, Base) 2936#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 2937#define DEPENDENT_TYPE(Class, Base) case Type::Class: 2938#include "clang/AST/TypeNodes.def" 2939 assert(false && "Non-canonical and dependent types shouldn't get here"); 2940 return QualType(); 2941 2942 case Type::LValueReference: 2943 case Type::RValueReference: 2944 case Type::MemberPointer: 2945 assert(false && "C++ should never be in mergeTypes"); 2946 return QualType(); 2947 2948 case Type::IncompleteArray: 2949 case Type::VariableArray: 2950 case Type::FunctionProto: 2951 case Type::ExtVector: 2952 case Type::ObjCQualifiedInterface: 2953 assert(false && "Types are eliminated above"); 2954 return QualType(); 2955 2956 case Type::Pointer: 2957 { 2958 // Merge two pointer types, while trying to preserve typedef info 2959 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 2960 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 2961 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 2962 if (ResultType.isNull()) return QualType(); 2963 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 2964 return LHS; 2965 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 2966 return RHS; 2967 return getPointerType(ResultType); 2968 } 2969 case Type::BlockPointer: 2970 { 2971 // Merge two block pointer types, while trying to preserve typedef info 2972 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 2973 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 2974 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 2975 if (ResultType.isNull()) return QualType(); 2976 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 2977 return LHS; 2978 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 2979 return RHS; 2980 return getBlockPointerType(ResultType); 2981 } 2982 case Type::ConstantArray: 2983 { 2984 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 2985 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 2986 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 2987 return QualType(); 2988 2989 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 2990 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 2991 QualType ResultType = mergeTypes(LHSElem, RHSElem); 2992 if (ResultType.isNull()) return QualType(); 2993 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 2994 return LHS; 2995 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 2996 return RHS; 2997 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 2998 ArrayType::ArraySizeModifier(), 0); 2999 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3000 ArrayType::ArraySizeModifier(), 0); 3001 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3002 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3003 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3004 return LHS; 3005 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3006 return RHS; 3007 if (LVAT) { 3008 // FIXME: This isn't correct! But tricky to implement because 3009 // the array's size has to be the size of LHS, but the type 3010 // has to be different. 3011 return LHS; 3012 } 3013 if (RVAT) { 3014 // FIXME: This isn't correct! But tricky to implement because 3015 // the array's size has to be the size of RHS, but the type 3016 // has to be different. 3017 return RHS; 3018 } 3019 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3020 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3021 return getIncompleteArrayType(ResultType, ArrayType::ArraySizeModifier(),0); 3022 } 3023 case Type::FunctionNoProto: 3024 return mergeFunctionTypes(LHS, RHS); 3025 case Type::Record: 3026 case Type::Enum: 3027 // FIXME: Why are these compatible? 3028 if (isObjCIdStructType(LHS) && isObjCClassStructType(RHS)) return LHS; 3029 if (isObjCClassStructType(LHS) && isObjCIdStructType(RHS)) return LHS; 3030 return QualType(); 3031 case Type::Builtin: 3032 // Only exactly equal builtin types are compatible, which is tested above. 3033 return QualType(); 3034 case Type::Complex: 3035 // Distinct complex types are incompatible. 3036 return QualType(); 3037 case Type::Vector: 3038 // FIXME: The merged type should be an ExtVector! 3039 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3040 return LHS; 3041 return QualType(); 3042 case Type::ObjCInterface: { 3043 // Check if the interfaces are assignment compatible. 3044 // FIXME: This should be type compatibility, e.g. whether 3045 // "LHS x; RHS x;" at global scope is legal. 3046 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3047 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3048 if (LHSIface && RHSIface && 3049 canAssignObjCInterfaces(LHSIface, RHSIface)) 3050 return LHS; 3051 3052 return QualType(); 3053 } 3054 case Type::ObjCQualifiedId: 3055 // Distinct qualified id's are not compatible. 3056 return QualType(); 3057 case Type::FixedWidthInt: 3058 // Distinct fixed-width integers are not compatible. 3059 return QualType(); 3060 case Type::ObjCQualifiedClass: 3061 // Distinct qualified classes are not compatible. 3062 return QualType(); 3063 case Type::ExtQual: 3064 // FIXME: ExtQual types can be compatible even if they're not 3065 // identical! 3066 return QualType(); 3067 // First attempt at an implementation, but I'm not really sure it's 3068 // right... 3069#if 0 3070 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3071 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3072 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3073 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3074 return QualType(); 3075 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3076 LHSBase = QualType(LQual->getBaseType(), 0); 3077 RHSBase = QualType(RQual->getBaseType(), 0); 3078 ResultType = mergeTypes(LHSBase, RHSBase); 3079 if (ResultType.isNull()) return QualType(); 3080 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3081 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3082 return LHS; 3083 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3084 return RHS; 3085 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3086 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3087 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3088 return ResultType; 3089#endif 3090 3091 case Type::TemplateSpecialization: 3092 assert(false && "Dependent types have no size"); 3093 break; 3094 } 3095 3096 return QualType(); 3097} 3098 3099//===----------------------------------------------------------------------===// 3100// Integer Predicates 3101//===----------------------------------------------------------------------===// 3102 3103unsigned ASTContext::getIntWidth(QualType T) { 3104 if (T == BoolTy) 3105 return 1; 3106 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3107 return FWIT->getWidth(); 3108 } 3109 // For builtin types, just use the standard type sizing method 3110 return (unsigned)getTypeSize(T); 3111} 3112 3113QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3114 assert(T->isSignedIntegerType() && "Unexpected type"); 3115 if (const EnumType* ETy = T->getAsEnumType()) 3116 T = ETy->getDecl()->getIntegerType(); 3117 const BuiltinType* BTy = T->getAsBuiltinType(); 3118 assert (BTy && "Unexpected signed integer type"); 3119 switch (BTy->getKind()) { 3120 case BuiltinType::Char_S: 3121 case BuiltinType::SChar: 3122 return UnsignedCharTy; 3123 case BuiltinType::Short: 3124 return UnsignedShortTy; 3125 case BuiltinType::Int: 3126 return UnsignedIntTy; 3127 case BuiltinType::Long: 3128 return UnsignedLongTy; 3129 case BuiltinType::LongLong: 3130 return UnsignedLongLongTy; 3131 default: 3132 assert(0 && "Unexpected signed integer type"); 3133 return QualType(); 3134 } 3135} 3136 3137 3138//===----------------------------------------------------------------------===// 3139// Serialization Support 3140//===----------------------------------------------------------------------===// 3141 3142enum { 3143 BasicMetadataBlock = 1, 3144 ASTContextBlock = 2, 3145 DeclsBlock = 3 3146}; 3147 3148void ASTContext::EmitASTBitcodeBuffer(std::vector<unsigned char> &Buffer) const{ 3149 // Create bitstream. 3150 llvm::BitstreamWriter Stream(Buffer); 3151 3152 // Emit the preamble. 3153 Stream.Emit((unsigned)'B', 8); 3154 Stream.Emit((unsigned)'C', 8); 3155 Stream.Emit(0xC, 4); 3156 Stream.Emit(0xF, 4); 3157 Stream.Emit(0xE, 4); 3158 Stream.Emit(0x0, 4); 3159 3160 // Create serializer. 3161 llvm::Serializer S(Stream); 3162 3163 // ===---------------------------------------------------===/ 3164 // Serialize the "Translation Unit" metadata. 3165 // ===---------------------------------------------------===/ 3166 3167 // Emit ASTContext. 3168 S.EnterBlock(ASTContextBlock); 3169 S.EmitOwnedPtr(this); 3170 S.ExitBlock(); // exit "ASTContextBlock" 3171 3172 S.EnterBlock(BasicMetadataBlock); 3173 3174 // Block for SourceManager and Target. Allows easy skipping 3175 // around to the block for the Selectors during deserialization. 3176 S.EnterBlock(); 3177 3178 // Emit the SourceManager. 3179 S.Emit(getSourceManager()); 3180 3181 // Emit the Target. 3182 S.EmitPtr(&Target); 3183 S.EmitCStr(Target.getTargetTriple()); 3184 3185 S.ExitBlock(); // exit "SourceManager and Target Block" 3186 3187 // Emit the Selectors. 3188 S.Emit(Selectors); 3189 3190 // Emit the Identifier Table. 3191 S.Emit(Idents); 3192 3193 S.ExitBlock(); // exit "BasicMetadataBlock" 3194} 3195 3196 3197/// Emit - Serialize an ASTContext object to Bitcode. 3198void ASTContext::Emit(llvm::Serializer& S) const { 3199 S.Emit(LangOpts); 3200 S.EmitRef(SourceMgr); 3201 S.EmitRef(Target); 3202 S.EmitRef(Idents); 3203 S.EmitRef(Selectors); 3204 3205 // Emit the size of the type vector so that we can reserve that size 3206 // when we reconstitute the ASTContext object. 3207 S.EmitInt(Types.size()); 3208 3209 for (std::vector<Type*>::const_iterator I=Types.begin(), E=Types.end(); 3210 I!=E;++I) 3211 (*I)->Emit(S); 3212 3213 S.EmitOwnedPtr(TUDecl); 3214 3215 // FIXME: S.EmitOwnedPtr(CFConstantStringTypeDecl); 3216} 3217 3218 3219ASTContext *ASTContext::ReadASTBitcodeBuffer(llvm::MemoryBuffer &Buffer, 3220 FileManager &FMgr) { 3221 // Check if the file is of the proper length. 3222 if (Buffer.getBufferSize() & 0x3) { 3223 // FIXME: Provide diagnostic: "Length should be a multiple of 4 bytes." 3224 return 0; 3225 } 3226 3227 // Create the bitstream reader. 3228 unsigned char *BufPtr = (unsigned char *)Buffer.getBufferStart(); 3229 llvm::BitstreamReader Stream(BufPtr, BufPtr+Buffer.getBufferSize()); 3230 3231 if (Stream.Read(8) != 'B' || 3232 Stream.Read(8) != 'C' || 3233 Stream.Read(4) != 0xC || 3234 Stream.Read(4) != 0xF || 3235 Stream.Read(4) != 0xE || 3236 Stream.Read(4) != 0x0) { 3237 // FIXME: Provide diagnostic. 3238 return NULL; 3239 } 3240 3241 // Create the deserializer. 3242 llvm::Deserializer Dezr(Stream); 3243 3244 // ===---------------------------------------------------===/ 3245 // Deserialize the "Translation Unit" metadata. 3246 // ===---------------------------------------------------===/ 3247 3248 // Skip to the BasicMetaDataBlock. First jump to ASTContextBlock 3249 // (which will appear earlier) and record its location. 3250 3251 bool FoundBlock = Dezr.SkipToBlock(ASTContextBlock); 3252 assert (FoundBlock); 3253 3254 llvm::Deserializer::Location ASTContextBlockLoc = 3255 Dezr.getCurrentBlockLocation(); 3256 3257 FoundBlock = Dezr.SkipToBlock(BasicMetadataBlock); 3258 assert (FoundBlock); 3259 3260 // Read the SourceManager. 3261 SourceManager::CreateAndRegister(Dezr, FMgr); 3262 3263 { // Read the TargetInfo. 3264 llvm::SerializedPtrID PtrID = Dezr.ReadPtrID(); 3265 char* triple = Dezr.ReadCStr(NULL,0,true); 3266 Dezr.RegisterPtr(PtrID, TargetInfo::CreateTargetInfo(std::string(triple))); 3267 delete [] triple; 3268 } 3269 3270 // For Selectors, we must read the identifier table first because the 3271 // SelectorTable depends on the identifiers being already deserialized. 3272 llvm::Deserializer::Location SelectorBlkLoc = Dezr.getCurrentBlockLocation(); 3273 Dezr.SkipBlock(); 3274 3275 // Read the identifier table. 3276 IdentifierTable::CreateAndRegister(Dezr); 3277 3278 // Now jump back and read the selectors. 3279 Dezr.JumpTo(SelectorBlkLoc); 3280 SelectorTable::CreateAndRegister(Dezr); 3281 3282 // Now jump back to ASTContextBlock and read the ASTContext. 3283 Dezr.JumpTo(ASTContextBlockLoc); 3284 return Dezr.ReadOwnedPtr<ASTContext>(); 3285} 3286 3287ASTContext* ASTContext::Create(llvm::Deserializer& D) { 3288 3289 // Read the language options. 3290 LangOptions LOpts; 3291 LOpts.Read(D); 3292 3293 SourceManager &SM = D.ReadRef<SourceManager>(); 3294 TargetInfo &t = D.ReadRef<TargetInfo>(); 3295 IdentifierTable &idents = D.ReadRef<IdentifierTable>(); 3296 SelectorTable &sels = D.ReadRef<SelectorTable>(); 3297 3298 unsigned size_reserve = D.ReadInt(); 3299 3300 ASTContext* A = new ASTContext(LOpts, SM, t, idents, sels, 3301 size_reserve); 3302 3303 for (unsigned i = 0; i < size_reserve; ++i) 3304 Type::Create(*A,i,D); 3305 3306 A->TUDecl = cast<TranslationUnitDecl>(D.ReadOwnedPtr<Decl>(*A)); 3307 3308 // FIXME: A->CFConstantStringTypeDecl = D.ReadOwnedPtr<RecordDecl>(); 3309 3310 return A; 3311} 3312