ASTContext.cpp revision 194179
1//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclCXX.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/Expr.h" 19#include "clang/AST/ExternalASTSource.h" 20#include "clang/AST/RecordLayout.h" 21#include "clang/Basic/Builtins.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "llvm/ADT/StringExtras.h" 25#include "llvm/Support/MathExtras.h" 26#include "llvm/Support/MemoryBuffer.h" 27using namespace clang; 28 29enum FloatingRank { 30 FloatRank, DoubleRank, LongDoubleRank 31}; 32 33ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 34 TargetInfo &t, 35 IdentifierTable &idents, SelectorTable &sels, 36 Builtin::Context &builtins, 37 bool FreeMem, unsigned size_reserve) : 38 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 39 ObjCFastEnumerationStateTypeDecl(0), SourceMgr(SM), LangOpts(LOpts), 40 FreeMemory(FreeMem), Target(t), Idents(idents), Selectors(sels), 41 BuiltinInfo(builtins), ExternalSource(0) { 42 if (size_reserve > 0) Types.reserve(size_reserve); 43 InitBuiltinTypes(); 44 TUDecl = TranslationUnitDecl::Create(*this); 45 PrintingPolicy.CPlusPlus = LangOpts.CPlusPlus; 46} 47 48ASTContext::~ASTContext() { 49 // Deallocate all the types. 50 while (!Types.empty()) { 51 Types.back()->Destroy(*this); 52 Types.pop_back(); 53 } 54 55 { 56 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 57 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 58 while (I != E) { 59 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 60 delete R; 61 } 62 } 63 64 { 65 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 66 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 67 while (I != E) { 68 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 69 delete R; 70 } 71 } 72 73 // Destroy nested-name-specifiers. 74 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 75 NNS = NestedNameSpecifiers.begin(), 76 NNSEnd = NestedNameSpecifiers.end(); 77 NNS != NNSEnd; 78 /* Increment in loop */) 79 (*NNS++).Destroy(*this); 80 81 if (GlobalNestedNameSpecifier) 82 GlobalNestedNameSpecifier->Destroy(*this); 83 84 TUDecl->Destroy(*this); 85} 86 87void 88ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 89 ExternalSource.reset(Source.take()); 90} 91 92void ASTContext::PrintStats() const { 93 fprintf(stderr, "*** AST Context Stats:\n"); 94 fprintf(stderr, " %d types total.\n", (int)Types.size()); 95 96 unsigned counts[] = { 97#define TYPE(Name, Parent) 0, 98#define ABSTRACT_TYPE(Name, Parent) 99#include "clang/AST/TypeNodes.def" 100 0 // Extra 101 }; 102 103 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 104 Type *T = Types[i]; 105 counts[(unsigned)T->getTypeClass()]++; 106 } 107 108 unsigned Idx = 0; 109 unsigned TotalBytes = 0; 110#define TYPE(Name, Parent) \ 111 if (counts[Idx]) \ 112 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 113 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 114 ++Idx; 115#define ABSTRACT_TYPE(Name, Parent) 116#include "clang/AST/TypeNodes.def" 117 118 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 119 120 if (ExternalSource.get()) { 121 fprintf(stderr, "\n"); 122 ExternalSource->PrintStats(); 123 } 124} 125 126 127void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 128 Types.push_back((R = QualType(new (*this,8) BuiltinType(K),0)).getTypePtr()); 129} 130 131void ASTContext::InitBuiltinTypes() { 132 assert(VoidTy.isNull() && "Context reinitialized?"); 133 134 // C99 6.2.5p19. 135 InitBuiltinType(VoidTy, BuiltinType::Void); 136 137 // C99 6.2.5p2. 138 InitBuiltinType(BoolTy, BuiltinType::Bool); 139 // C99 6.2.5p3. 140 if (LangOpts.CharIsSigned) 141 InitBuiltinType(CharTy, BuiltinType::Char_S); 142 else 143 InitBuiltinType(CharTy, BuiltinType::Char_U); 144 // C99 6.2.5p4. 145 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 146 InitBuiltinType(ShortTy, BuiltinType::Short); 147 InitBuiltinType(IntTy, BuiltinType::Int); 148 InitBuiltinType(LongTy, BuiltinType::Long); 149 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 150 151 // C99 6.2.5p6. 152 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 153 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 154 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 155 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 156 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 157 158 // C99 6.2.5p10. 159 InitBuiltinType(FloatTy, BuiltinType::Float); 160 InitBuiltinType(DoubleTy, BuiltinType::Double); 161 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 162 163 // GNU extension, 128-bit integers. 164 InitBuiltinType(Int128Ty, BuiltinType::Int128); 165 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 166 167 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 168 InitBuiltinType(WCharTy, BuiltinType::WChar); 169 else // C99 170 WCharTy = getFromTargetType(Target.getWCharType()); 171 172 // Placeholder type for functions. 173 InitBuiltinType(OverloadTy, BuiltinType::Overload); 174 175 // Placeholder type for type-dependent expressions whose type is 176 // completely unknown. No code should ever check a type against 177 // DependentTy and users should never see it; however, it is here to 178 // help diagnose failures to properly check for type-dependent 179 // expressions. 180 InitBuiltinType(DependentTy, BuiltinType::Dependent); 181 182 // C99 6.2.5p11. 183 FloatComplexTy = getComplexType(FloatTy); 184 DoubleComplexTy = getComplexType(DoubleTy); 185 LongDoubleComplexTy = getComplexType(LongDoubleTy); 186 187 BuiltinVaListType = QualType(); 188 ObjCIdType = QualType(); 189 IdStructType = 0; 190 ObjCClassType = QualType(); 191 ClassStructType = 0; 192 193 ObjCConstantStringType = QualType(); 194 195 // void * type 196 VoidPtrTy = getPointerType(VoidTy); 197 198 // nullptr type (C++0x 2.14.7) 199 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 200} 201 202//===----------------------------------------------------------------------===// 203// Type Sizing and Analysis 204//===----------------------------------------------------------------------===// 205 206/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 207/// scalar floating point type. 208const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 209 const BuiltinType *BT = T->getAsBuiltinType(); 210 assert(BT && "Not a floating point type!"); 211 switch (BT->getKind()) { 212 default: assert(0 && "Not a floating point type!"); 213 case BuiltinType::Float: return Target.getFloatFormat(); 214 case BuiltinType::Double: return Target.getDoubleFormat(); 215 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 216 } 217} 218 219/// getDeclAlign - Return a conservative estimate of the alignment of the 220/// specified decl. Note that bitfields do not have a valid alignment, so 221/// this method will assert on them. 222unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 223 unsigned Align = Target.getCharWidth(); 224 225 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 226 Align = std::max(Align, AA->getAlignment()); 227 228 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 229 QualType T = VD->getType(); 230 if (const ReferenceType* RT = T->getAsReferenceType()) { 231 unsigned AS = RT->getPointeeType().getAddressSpace(); 232 Align = Target.getPointerAlign(AS); 233 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 234 // Incomplete or function types default to 1. 235 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 236 T = cast<ArrayType>(T)->getElementType(); 237 238 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 239 } 240 } 241 242 return Align / Target.getCharWidth(); 243} 244 245/// getTypeSize - Return the size of the specified type, in bits. This method 246/// does not work on incomplete types. 247std::pair<uint64_t, unsigned> 248ASTContext::getTypeInfo(const Type *T) { 249 uint64_t Width=0; 250 unsigned Align=8; 251 switch (T->getTypeClass()) { 252#define TYPE(Class, Base) 253#define ABSTRACT_TYPE(Class, Base) 254#define NON_CANONICAL_TYPE(Class, Base) 255#define DEPENDENT_TYPE(Class, Base) case Type::Class: 256#include "clang/AST/TypeNodes.def" 257 assert(false && "Should not see dependent types"); 258 break; 259 260 case Type::FunctionNoProto: 261 case Type::FunctionProto: 262 // GCC extension: alignof(function) = 32 bits 263 Width = 0; 264 Align = 32; 265 break; 266 267 case Type::IncompleteArray: 268 case Type::VariableArray: 269 Width = 0; 270 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 271 break; 272 273 case Type::ConstantArray: { 274 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 275 276 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 277 Width = EltInfo.first*CAT->getSize().getZExtValue(); 278 Align = EltInfo.second; 279 break; 280 } 281 case Type::ExtVector: 282 case Type::Vector: { 283 std::pair<uint64_t, unsigned> EltInfo = 284 getTypeInfo(cast<VectorType>(T)->getElementType()); 285 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 286 Align = Width; 287 // If the alignment is not a power of 2, round up to the next power of 2. 288 // This happens for non-power-of-2 length vectors. 289 // FIXME: this should probably be a target property. 290 Align = 1 << llvm::Log2_32_Ceil(Align); 291 break; 292 } 293 294 case Type::Builtin: 295 switch (cast<BuiltinType>(T)->getKind()) { 296 default: assert(0 && "Unknown builtin type!"); 297 case BuiltinType::Void: 298 // GCC extension: alignof(void) = 8 bits. 299 Width = 0; 300 Align = 8; 301 break; 302 303 case BuiltinType::Bool: 304 Width = Target.getBoolWidth(); 305 Align = Target.getBoolAlign(); 306 break; 307 case BuiltinType::Char_S: 308 case BuiltinType::Char_U: 309 case BuiltinType::UChar: 310 case BuiltinType::SChar: 311 Width = Target.getCharWidth(); 312 Align = Target.getCharAlign(); 313 break; 314 case BuiltinType::WChar: 315 Width = Target.getWCharWidth(); 316 Align = Target.getWCharAlign(); 317 break; 318 case BuiltinType::UShort: 319 case BuiltinType::Short: 320 Width = Target.getShortWidth(); 321 Align = Target.getShortAlign(); 322 break; 323 case BuiltinType::UInt: 324 case BuiltinType::Int: 325 Width = Target.getIntWidth(); 326 Align = Target.getIntAlign(); 327 break; 328 case BuiltinType::ULong: 329 case BuiltinType::Long: 330 Width = Target.getLongWidth(); 331 Align = Target.getLongAlign(); 332 break; 333 case BuiltinType::ULongLong: 334 case BuiltinType::LongLong: 335 Width = Target.getLongLongWidth(); 336 Align = Target.getLongLongAlign(); 337 break; 338 case BuiltinType::Int128: 339 case BuiltinType::UInt128: 340 Width = 128; 341 Align = 128; // int128_t is 128-bit aligned on all targets. 342 break; 343 case BuiltinType::Float: 344 Width = Target.getFloatWidth(); 345 Align = Target.getFloatAlign(); 346 break; 347 case BuiltinType::Double: 348 Width = Target.getDoubleWidth(); 349 Align = Target.getDoubleAlign(); 350 break; 351 case BuiltinType::LongDouble: 352 Width = Target.getLongDoubleWidth(); 353 Align = Target.getLongDoubleAlign(); 354 break; 355 case BuiltinType::NullPtr: 356 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 357 Align = Target.getPointerAlign(0); // == sizeof(void*) 358 break; 359 } 360 break; 361 case Type::FixedWidthInt: 362 // FIXME: This isn't precisely correct; the width/alignment should depend 363 // on the available types for the target 364 Width = cast<FixedWidthIntType>(T)->getWidth(); 365 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 366 Align = Width; 367 break; 368 case Type::ExtQual: 369 // FIXME: Pointers into different addr spaces could have different sizes and 370 // alignment requirements: getPointerInfo should take an AddrSpace. 371 return getTypeInfo(QualType(cast<ExtQualType>(T)->getBaseType(), 0)); 372 case Type::ObjCQualifiedId: 373 case Type::ObjCQualifiedInterface: 374 Width = Target.getPointerWidth(0); 375 Align = Target.getPointerAlign(0); 376 break; 377 case Type::BlockPointer: { 378 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 379 Width = Target.getPointerWidth(AS); 380 Align = Target.getPointerAlign(AS); 381 break; 382 } 383 case Type::Pointer: { 384 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 385 Width = Target.getPointerWidth(AS); 386 Align = Target.getPointerAlign(AS); 387 break; 388 } 389 case Type::LValueReference: 390 case Type::RValueReference: 391 // "When applied to a reference or a reference type, the result is the size 392 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 393 // FIXME: This is wrong for struct layout: a reference in a struct has 394 // pointer size. 395 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 396 case Type::MemberPointer: { 397 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 398 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 399 // If we ever want to support other ABIs this needs to be abstracted. 400 401 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 402 std::pair<uint64_t, unsigned> PtrDiffInfo = 403 getTypeInfo(getPointerDiffType()); 404 Width = PtrDiffInfo.first; 405 if (Pointee->isFunctionType()) 406 Width *= 2; 407 Align = PtrDiffInfo.second; 408 break; 409 } 410 case Type::Complex: { 411 // Complex types have the same alignment as their elements, but twice the 412 // size. 413 std::pair<uint64_t, unsigned> EltInfo = 414 getTypeInfo(cast<ComplexType>(T)->getElementType()); 415 Width = EltInfo.first*2; 416 Align = EltInfo.second; 417 break; 418 } 419 case Type::ObjCInterface: { 420 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 421 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 422 Width = Layout.getSize(); 423 Align = Layout.getAlignment(); 424 break; 425 } 426 case Type::Record: 427 case Type::Enum: { 428 const TagType *TT = cast<TagType>(T); 429 430 if (TT->getDecl()->isInvalidDecl()) { 431 Width = 1; 432 Align = 1; 433 break; 434 } 435 436 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 437 return getTypeInfo(ET->getDecl()->getIntegerType()); 438 439 const RecordType *RT = cast<RecordType>(TT); 440 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 441 Width = Layout.getSize(); 442 Align = Layout.getAlignment(); 443 break; 444 } 445 446 case Type::Typedef: { 447 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 448 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 449 Align = Aligned->getAlignment(); 450 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 451 } else 452 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 453 break; 454 } 455 456 case Type::TypeOfExpr: 457 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 458 .getTypePtr()); 459 460 case Type::TypeOf: 461 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 462 463 case Type::QualifiedName: 464 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 465 466 case Type::TemplateSpecialization: 467 assert(getCanonicalType(T) != T && 468 "Cannot request the size of a dependent type"); 469 // FIXME: this is likely to be wrong once we support template 470 // aliases, since a template alias could refer to a typedef that 471 // has an __aligned__ attribute on it. 472 return getTypeInfo(getCanonicalType(T)); 473 } 474 475 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 476 return std::make_pair(Width, Align); 477} 478 479/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 480/// type for the current target in bits. This can be different than the ABI 481/// alignment in cases where it is beneficial for performance to overalign 482/// a data type. 483unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 484 unsigned ABIAlign = getTypeAlign(T); 485 486 // Double and long long should be naturally aligned if possible. 487 if (const ComplexType* CT = T->getAsComplexType()) 488 T = CT->getElementType().getTypePtr(); 489 if (T->isSpecificBuiltinType(BuiltinType::Double) || 490 T->isSpecificBuiltinType(BuiltinType::LongLong)) 491 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 492 493 return ABIAlign; 494} 495 496 497/// LayoutField - Field layout. 498void ASTRecordLayout::LayoutField(const FieldDecl *FD, unsigned FieldNo, 499 bool IsUnion, unsigned StructPacking, 500 ASTContext &Context) { 501 unsigned FieldPacking = StructPacking; 502 uint64_t FieldOffset = IsUnion ? 0 : Size; 503 uint64_t FieldSize; 504 unsigned FieldAlign; 505 506 // FIXME: Should this override struct packing? Probably we want to 507 // take the minimum? 508 if (const PackedAttr *PA = FD->getAttr<PackedAttr>()) 509 FieldPacking = PA->getAlignment(); 510 511 if (const Expr *BitWidthExpr = FD->getBitWidth()) { 512 // TODO: Need to check this algorithm on other targets! 513 // (tested on Linux-X86) 514 FieldSize = BitWidthExpr->EvaluateAsInt(Context).getZExtValue(); 515 516 std::pair<uint64_t, unsigned> FieldInfo = 517 Context.getTypeInfo(FD->getType()); 518 uint64_t TypeSize = FieldInfo.first; 519 520 // Determine the alignment of this bitfield. The packing 521 // attributes define a maximum and the alignment attribute defines 522 // a minimum. 523 // FIXME: What is the right behavior when the specified alignment 524 // is smaller than the specified packing? 525 FieldAlign = FieldInfo.second; 526 if (FieldPacking) 527 FieldAlign = std::min(FieldAlign, FieldPacking); 528 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 529 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 530 531 // Check if we need to add padding to give the field the correct 532 // alignment. 533 if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize) 534 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 535 536 // Padding members don't affect overall alignment 537 if (!FD->getIdentifier()) 538 FieldAlign = 1; 539 } else { 540 if (FD->getType()->isIncompleteArrayType()) { 541 // This is a flexible array member; we can't directly 542 // query getTypeInfo about these, so we figure it out here. 543 // Flexible array members don't have any size, but they 544 // have to be aligned appropriately for their element type. 545 FieldSize = 0; 546 const ArrayType* ATy = Context.getAsArrayType(FD->getType()); 547 FieldAlign = Context.getTypeAlign(ATy->getElementType()); 548 } else if (const ReferenceType *RT = FD->getType()->getAsReferenceType()) { 549 unsigned AS = RT->getPointeeType().getAddressSpace(); 550 FieldSize = Context.Target.getPointerWidth(AS); 551 FieldAlign = Context.Target.getPointerAlign(AS); 552 } else { 553 std::pair<uint64_t, unsigned> FieldInfo = 554 Context.getTypeInfo(FD->getType()); 555 FieldSize = FieldInfo.first; 556 FieldAlign = FieldInfo.second; 557 } 558 559 // Determine the alignment of this bitfield. The packing 560 // attributes define a maximum and the alignment attribute defines 561 // a minimum. Additionally, the packing alignment must be at least 562 // a byte for non-bitfields. 563 // 564 // FIXME: What is the right behavior when the specified alignment 565 // is smaller than the specified packing? 566 if (FieldPacking) 567 FieldAlign = std::min(FieldAlign, std::max(8U, FieldPacking)); 568 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 569 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 570 571 // Round up the current record size to the field's alignment boundary. 572 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 573 } 574 575 // Place this field at the current location. 576 FieldOffsets[FieldNo] = FieldOffset; 577 578 // Reserve space for this field. 579 if (IsUnion) { 580 Size = std::max(Size, FieldSize); 581 } else { 582 Size = FieldOffset + FieldSize; 583 } 584 585 // Remember the next available offset. 586 NextOffset = Size; 587 588 // Remember max struct/class alignment. 589 Alignment = std::max(Alignment, FieldAlign); 590} 591 592static void CollectLocalObjCIvars(ASTContext *Ctx, 593 const ObjCInterfaceDecl *OI, 594 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 595 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 596 E = OI->ivar_end(); I != E; ++I) { 597 ObjCIvarDecl *IVDecl = *I; 598 if (!IVDecl->isInvalidDecl()) 599 Fields.push_back(cast<FieldDecl>(IVDecl)); 600 } 601} 602 603void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 604 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 605 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 606 CollectObjCIvars(SuperClass, Fields); 607 CollectLocalObjCIvars(this, OI, Fields); 608} 609 610/// ShallowCollectObjCIvars - 611/// Collect all ivars, including those synthesized, in the current class. 612/// 613void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 614 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 615 bool CollectSynthesized) { 616 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 617 E = OI->ivar_end(); I != E; ++I) { 618 Ivars.push_back(*I); 619 } 620 if (CollectSynthesized) 621 CollectSynthesizedIvars(OI, Ivars); 622} 623 624void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 625 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 626 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(*this), 627 E = PD->prop_end(*this); I != E; ++I) 628 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 629 Ivars.push_back(Ivar); 630 631 // Also look into nested protocols. 632 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 633 E = PD->protocol_end(); P != E; ++P) 634 CollectProtocolSynthesizedIvars(*P, Ivars); 635} 636 637/// CollectSynthesizedIvars - 638/// This routine collect synthesized ivars for the designated class. 639/// 640void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 641 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 642 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(*this), 643 E = OI->prop_end(*this); I != E; ++I) { 644 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 645 Ivars.push_back(Ivar); 646 } 647 // Also look into interface's protocol list for properties declared 648 // in the protocol and whose ivars are synthesized. 649 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 650 PE = OI->protocol_end(); P != PE; ++P) { 651 ObjCProtocolDecl *PD = (*P); 652 CollectProtocolSynthesizedIvars(PD, Ivars); 653 } 654} 655 656unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 657 unsigned count = 0; 658 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(*this), 659 E = PD->prop_end(*this); I != E; ++I) 660 if ((*I)->getPropertyIvarDecl()) 661 ++count; 662 663 // Also look into nested protocols. 664 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 665 E = PD->protocol_end(); P != E; ++P) 666 count += CountProtocolSynthesizedIvars(*P); 667 return count; 668} 669 670unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) 671{ 672 unsigned count = 0; 673 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(*this), 674 E = OI->prop_end(*this); I != E; ++I) { 675 if ((*I)->getPropertyIvarDecl()) 676 ++count; 677 } 678 // Also look into interface's protocol list for properties declared 679 // in the protocol and whose ivars are synthesized. 680 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 681 PE = OI->protocol_end(); P != PE; ++P) { 682 ObjCProtocolDecl *PD = (*P); 683 count += CountProtocolSynthesizedIvars(PD); 684 } 685 return count; 686} 687 688/// getInterfaceLayoutImpl - Get or compute information about the 689/// layout of the given interface. 690/// 691/// \param Impl - If given, also include the layout of the interface's 692/// implementation. This may differ by including synthesized ivars. 693const ASTRecordLayout & 694ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 695 const ObjCImplementationDecl *Impl) { 696 assert(!D->isForwardDecl() && "Invalid interface decl!"); 697 698 // Look up this layout, if already laid out, return what we have. 699 ObjCContainerDecl *Key = 700 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 701 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 702 return *Entry; 703 704 unsigned FieldCount = D->ivar_size(); 705 // Add in synthesized ivar count if laying out an implementation. 706 if (Impl) { 707 unsigned SynthCount = CountSynthesizedIvars(D); 708 FieldCount += SynthCount; 709 // If there aren't any sythesized ivars then reuse the interface 710 // entry. Note we can't cache this because we simply free all 711 // entries later; however we shouldn't look up implementations 712 // frequently. 713 if (SynthCount == 0) 714 return getObjCLayout(D, 0); 715 } 716 717 ASTRecordLayout *NewEntry = NULL; 718 if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 719 const ASTRecordLayout &SL = getASTObjCInterfaceLayout(SD); 720 unsigned Alignment = SL.getAlignment(); 721 722 // We start laying out ivars not at the end of the superclass 723 // structure, but at the next byte following the last field. 724 uint64_t Size = llvm::RoundUpToAlignment(SL.NextOffset, 8); 725 726 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(Size, Alignment); 727 NewEntry->InitializeLayout(FieldCount); 728 } else { 729 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(); 730 NewEntry->InitializeLayout(FieldCount); 731 } 732 733 unsigned StructPacking = 0; 734 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 735 StructPacking = PA->getAlignment(); 736 737 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 738 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 739 AA->getAlignment())); 740 741 // Layout each ivar sequentially. 742 unsigned i = 0; 743 llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; 744 ShallowCollectObjCIvars(D, Ivars, Impl); 745 for (unsigned k = 0, e = Ivars.size(); k != e; ++k) 746 NewEntry->LayoutField(Ivars[k], i++, false, StructPacking, *this); 747 748 // Finally, round the size of the total struct up to the alignment of the 749 // struct itself. 750 NewEntry->FinalizeLayout(); 751 return *NewEntry; 752} 753 754const ASTRecordLayout & 755ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 756 return getObjCLayout(D, 0); 757} 758 759const ASTRecordLayout & 760ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 761 return getObjCLayout(D->getClassInterface(), D); 762} 763 764/// getASTRecordLayout - Get or compute information about the layout of the 765/// specified record (struct/union/class), which indicates its size and field 766/// position information. 767const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 768 D = D->getDefinition(*this); 769 assert(D && "Cannot get layout of forward declarations!"); 770 771 // Look up this layout, if already laid out, return what we have. 772 const ASTRecordLayout *&Entry = ASTRecordLayouts[D]; 773 if (Entry) return *Entry; 774 775 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 776 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 777 ASTRecordLayout *NewEntry = new ASTRecordLayout(); 778 Entry = NewEntry; 779 780 // FIXME: Avoid linear walk through the fields, if possible. 781 NewEntry->InitializeLayout(std::distance(D->field_begin(*this), 782 D->field_end(*this))); 783 bool IsUnion = D->isUnion(); 784 785 unsigned StructPacking = 0; 786 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 787 StructPacking = PA->getAlignment(); 788 789 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 790 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 791 AA->getAlignment())); 792 793 // Layout each field, for now, just sequentially, respecting alignment. In 794 // the future, this will need to be tweakable by targets. 795 unsigned FieldIdx = 0; 796 for (RecordDecl::field_iterator Field = D->field_begin(*this), 797 FieldEnd = D->field_end(*this); 798 Field != FieldEnd; (void)++Field, ++FieldIdx) 799 NewEntry->LayoutField(*Field, FieldIdx, IsUnion, StructPacking, *this); 800 801 // Finally, round the size of the total struct up to the alignment of the 802 // struct itself. 803 NewEntry->FinalizeLayout(getLangOptions().CPlusPlus); 804 return *NewEntry; 805} 806 807//===----------------------------------------------------------------------===// 808// Type creation/memoization methods 809//===----------------------------------------------------------------------===// 810 811QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 812 QualType CanT = getCanonicalType(T); 813 if (CanT.getAddressSpace() == AddressSpace) 814 return T; 815 816 // If we are composing extended qualifiers together, merge together into one 817 // ExtQualType node. 818 unsigned CVRQuals = T.getCVRQualifiers(); 819 QualType::GCAttrTypes GCAttr = QualType::GCNone; 820 Type *TypeNode = T.getTypePtr(); 821 822 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 823 // If this type already has an address space specified, it cannot get 824 // another one. 825 assert(EQT->getAddressSpace() == 0 && 826 "Type cannot be in multiple addr spaces!"); 827 GCAttr = EQT->getObjCGCAttr(); 828 TypeNode = EQT->getBaseType(); 829 } 830 831 // Check if we've already instantiated this type. 832 llvm::FoldingSetNodeID ID; 833 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 834 void *InsertPos = 0; 835 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 836 return QualType(EXTQy, CVRQuals); 837 838 // If the base type isn't canonical, this won't be a canonical type either, 839 // so fill in the canonical type field. 840 QualType Canonical; 841 if (!TypeNode->isCanonical()) { 842 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 843 844 // Update InsertPos, the previous call could have invalidated it. 845 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 846 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 847 } 848 ExtQualType *New = 849 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 850 ExtQualTypes.InsertNode(New, InsertPos); 851 Types.push_back(New); 852 return QualType(New, CVRQuals); 853} 854 855QualType ASTContext::getObjCGCQualType(QualType T, 856 QualType::GCAttrTypes GCAttr) { 857 QualType CanT = getCanonicalType(T); 858 if (CanT.getObjCGCAttr() == GCAttr) 859 return T; 860 861 if (T->isPointerType()) { 862 QualType Pointee = T->getAsPointerType()->getPointeeType(); 863 if (Pointee->isPointerType()) { 864 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 865 return getPointerType(ResultType); 866 } 867 } 868 // If we are composing extended qualifiers together, merge together into one 869 // ExtQualType node. 870 unsigned CVRQuals = T.getCVRQualifiers(); 871 Type *TypeNode = T.getTypePtr(); 872 unsigned AddressSpace = 0; 873 874 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 875 // If this type already has an address space specified, it cannot get 876 // another one. 877 assert(EQT->getObjCGCAttr() == QualType::GCNone && 878 "Type cannot be in multiple addr spaces!"); 879 AddressSpace = EQT->getAddressSpace(); 880 TypeNode = EQT->getBaseType(); 881 } 882 883 // Check if we've already instantiated an gc qual'd type of this type. 884 llvm::FoldingSetNodeID ID; 885 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 886 void *InsertPos = 0; 887 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 888 return QualType(EXTQy, CVRQuals); 889 890 // If the base type isn't canonical, this won't be a canonical type either, 891 // so fill in the canonical type field. 892 // FIXME: Isn't this also not canonical if the base type is a array 893 // or pointer type? I can't find any documentation for objc_gc, though... 894 QualType Canonical; 895 if (!T->isCanonical()) { 896 Canonical = getObjCGCQualType(CanT, GCAttr); 897 898 // Update InsertPos, the previous call could have invalidated it. 899 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 900 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 901 } 902 ExtQualType *New = 903 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 904 ExtQualTypes.InsertNode(New, InsertPos); 905 Types.push_back(New); 906 return QualType(New, CVRQuals); 907} 908 909/// getComplexType - Return the uniqued reference to the type for a complex 910/// number with the specified element type. 911QualType ASTContext::getComplexType(QualType T) { 912 // Unique pointers, to guarantee there is only one pointer of a particular 913 // structure. 914 llvm::FoldingSetNodeID ID; 915 ComplexType::Profile(ID, T); 916 917 void *InsertPos = 0; 918 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 919 return QualType(CT, 0); 920 921 // If the pointee type isn't canonical, this won't be a canonical type either, 922 // so fill in the canonical type field. 923 QualType Canonical; 924 if (!T->isCanonical()) { 925 Canonical = getComplexType(getCanonicalType(T)); 926 927 // Get the new insert position for the node we care about. 928 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 929 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 930 } 931 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 932 Types.push_back(New); 933 ComplexTypes.InsertNode(New, InsertPos); 934 return QualType(New, 0); 935} 936 937QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 938 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 939 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 940 FixedWidthIntType *&Entry = Map[Width]; 941 if (!Entry) 942 Entry = new FixedWidthIntType(Width, Signed); 943 return QualType(Entry, 0); 944} 945 946/// getPointerType - Return the uniqued reference to the type for a pointer to 947/// the specified type. 948QualType ASTContext::getPointerType(QualType T) { 949 // Unique pointers, to guarantee there is only one pointer of a particular 950 // structure. 951 llvm::FoldingSetNodeID ID; 952 PointerType::Profile(ID, T); 953 954 void *InsertPos = 0; 955 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 956 return QualType(PT, 0); 957 958 // If the pointee type isn't canonical, this won't be a canonical type either, 959 // so fill in the canonical type field. 960 QualType Canonical; 961 if (!T->isCanonical()) { 962 Canonical = getPointerType(getCanonicalType(T)); 963 964 // Get the new insert position for the node we care about. 965 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 966 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 967 } 968 PointerType *New = new (*this,8) PointerType(T, Canonical); 969 Types.push_back(New); 970 PointerTypes.InsertNode(New, InsertPos); 971 return QualType(New, 0); 972} 973 974/// getBlockPointerType - Return the uniqued reference to the type for 975/// a pointer to the specified block. 976QualType ASTContext::getBlockPointerType(QualType T) { 977 assert(T->isFunctionType() && "block of function types only"); 978 // Unique pointers, to guarantee there is only one block of a particular 979 // structure. 980 llvm::FoldingSetNodeID ID; 981 BlockPointerType::Profile(ID, T); 982 983 void *InsertPos = 0; 984 if (BlockPointerType *PT = 985 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 986 return QualType(PT, 0); 987 988 // If the block pointee type isn't canonical, this won't be a canonical 989 // type either so fill in the canonical type field. 990 QualType Canonical; 991 if (!T->isCanonical()) { 992 Canonical = getBlockPointerType(getCanonicalType(T)); 993 994 // Get the new insert position for the node we care about. 995 BlockPointerType *NewIP = 996 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 997 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 998 } 999 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 1000 Types.push_back(New); 1001 BlockPointerTypes.InsertNode(New, InsertPos); 1002 return QualType(New, 0); 1003} 1004 1005/// getLValueReferenceType - Return the uniqued reference to the type for an 1006/// lvalue reference to the specified type. 1007QualType ASTContext::getLValueReferenceType(QualType T) { 1008 // Unique pointers, to guarantee there is only one pointer of a particular 1009 // structure. 1010 llvm::FoldingSetNodeID ID; 1011 ReferenceType::Profile(ID, T); 1012 1013 void *InsertPos = 0; 1014 if (LValueReferenceType *RT = 1015 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1016 return QualType(RT, 0); 1017 1018 // If the referencee type isn't canonical, this won't be a canonical type 1019 // either, so fill in the canonical type field. 1020 QualType Canonical; 1021 if (!T->isCanonical()) { 1022 Canonical = getLValueReferenceType(getCanonicalType(T)); 1023 1024 // Get the new insert position for the node we care about. 1025 LValueReferenceType *NewIP = 1026 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1027 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1028 } 1029 1030 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 1031 Types.push_back(New); 1032 LValueReferenceTypes.InsertNode(New, InsertPos); 1033 return QualType(New, 0); 1034} 1035 1036/// getRValueReferenceType - Return the uniqued reference to the type for an 1037/// rvalue reference to the specified type. 1038QualType ASTContext::getRValueReferenceType(QualType T) { 1039 // Unique pointers, to guarantee there is only one pointer of a particular 1040 // structure. 1041 llvm::FoldingSetNodeID ID; 1042 ReferenceType::Profile(ID, T); 1043 1044 void *InsertPos = 0; 1045 if (RValueReferenceType *RT = 1046 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1047 return QualType(RT, 0); 1048 1049 // If the referencee type isn't canonical, this won't be a canonical type 1050 // either, so fill in the canonical type field. 1051 QualType Canonical; 1052 if (!T->isCanonical()) { 1053 Canonical = getRValueReferenceType(getCanonicalType(T)); 1054 1055 // Get the new insert position for the node we care about. 1056 RValueReferenceType *NewIP = 1057 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1058 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1059 } 1060 1061 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 1062 Types.push_back(New); 1063 RValueReferenceTypes.InsertNode(New, InsertPos); 1064 return QualType(New, 0); 1065} 1066 1067/// getMemberPointerType - Return the uniqued reference to the type for a 1068/// member pointer to the specified type, in the specified class. 1069QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1070{ 1071 // Unique pointers, to guarantee there is only one pointer of a particular 1072 // structure. 1073 llvm::FoldingSetNodeID ID; 1074 MemberPointerType::Profile(ID, T, Cls); 1075 1076 void *InsertPos = 0; 1077 if (MemberPointerType *PT = 1078 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1079 return QualType(PT, 0); 1080 1081 // If the pointee or class type isn't canonical, this won't be a canonical 1082 // type either, so fill in the canonical type field. 1083 QualType Canonical; 1084 if (!T->isCanonical()) { 1085 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1086 1087 // Get the new insert position for the node we care about. 1088 MemberPointerType *NewIP = 1089 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1090 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1091 } 1092 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1093 Types.push_back(New); 1094 MemberPointerTypes.InsertNode(New, InsertPos); 1095 return QualType(New, 0); 1096} 1097 1098/// getConstantArrayType - Return the unique reference to the type for an 1099/// array of the specified element type. 1100QualType ASTContext::getConstantArrayType(QualType EltTy, 1101 const llvm::APInt &ArySizeIn, 1102 ArrayType::ArraySizeModifier ASM, 1103 unsigned EltTypeQuals) { 1104 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1105 "Constant array of VLAs is illegal!"); 1106 1107 // Convert the array size into a canonical width matching the pointer size for 1108 // the target. 1109 llvm::APInt ArySize(ArySizeIn); 1110 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1111 1112 llvm::FoldingSetNodeID ID; 1113 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1114 1115 void *InsertPos = 0; 1116 if (ConstantArrayType *ATP = 1117 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1118 return QualType(ATP, 0); 1119 1120 // If the element type isn't canonical, this won't be a canonical type either, 1121 // so fill in the canonical type field. 1122 QualType Canonical; 1123 if (!EltTy->isCanonical()) { 1124 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1125 ASM, EltTypeQuals); 1126 // Get the new insert position for the node we care about. 1127 ConstantArrayType *NewIP = 1128 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1129 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1130 } 1131 1132 ConstantArrayType *New = 1133 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1134 ConstantArrayTypes.InsertNode(New, InsertPos); 1135 Types.push_back(New); 1136 return QualType(New, 0); 1137} 1138 1139/// getVariableArrayType - Returns a non-unique reference to the type for a 1140/// variable array of the specified element type. 1141QualType ASTContext::getVariableArrayType(QualType EltTy, Expr *NumElts, 1142 ArrayType::ArraySizeModifier ASM, 1143 unsigned EltTypeQuals) { 1144 // Since we don't unique expressions, it isn't possible to unique VLA's 1145 // that have an expression provided for their size. 1146 1147 VariableArrayType *New = 1148 new(*this,8)VariableArrayType(EltTy,QualType(), NumElts, ASM, EltTypeQuals); 1149 1150 VariableArrayTypes.push_back(New); 1151 Types.push_back(New); 1152 return QualType(New, 0); 1153} 1154 1155/// getDependentSizedArrayType - Returns a non-unique reference to 1156/// the type for a dependently-sized array of the specified element 1157/// type. FIXME: We will need these to be uniqued, or at least 1158/// comparable, at some point. 1159QualType ASTContext::getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 1160 ArrayType::ArraySizeModifier ASM, 1161 unsigned EltTypeQuals) { 1162 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1163 "Size must be type- or value-dependent!"); 1164 1165 // Since we don't unique expressions, it isn't possible to unique 1166 // dependently-sized array types. 1167 1168 DependentSizedArrayType *New = 1169 new (*this,8) DependentSizedArrayType(EltTy, QualType(), NumElts, 1170 ASM, EltTypeQuals); 1171 1172 DependentSizedArrayTypes.push_back(New); 1173 Types.push_back(New); 1174 return QualType(New, 0); 1175} 1176 1177QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1178 ArrayType::ArraySizeModifier ASM, 1179 unsigned EltTypeQuals) { 1180 llvm::FoldingSetNodeID ID; 1181 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1182 1183 void *InsertPos = 0; 1184 if (IncompleteArrayType *ATP = 1185 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1186 return QualType(ATP, 0); 1187 1188 // If the element type isn't canonical, this won't be a canonical type 1189 // either, so fill in the canonical type field. 1190 QualType Canonical; 1191 1192 if (!EltTy->isCanonical()) { 1193 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1194 ASM, EltTypeQuals); 1195 1196 // Get the new insert position for the node we care about. 1197 IncompleteArrayType *NewIP = 1198 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1199 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1200 } 1201 1202 IncompleteArrayType *New = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1203 ASM, EltTypeQuals); 1204 1205 IncompleteArrayTypes.InsertNode(New, InsertPos); 1206 Types.push_back(New); 1207 return QualType(New, 0); 1208} 1209 1210/// getVectorType - Return the unique reference to a vector type of 1211/// the specified element type and size. VectorType must be a built-in type. 1212QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1213 BuiltinType *baseType; 1214 1215 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1216 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1217 1218 // Check if we've already instantiated a vector of this type. 1219 llvm::FoldingSetNodeID ID; 1220 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1221 void *InsertPos = 0; 1222 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1223 return QualType(VTP, 0); 1224 1225 // If the element type isn't canonical, this won't be a canonical type either, 1226 // so fill in the canonical type field. 1227 QualType Canonical; 1228 if (!vecType->isCanonical()) { 1229 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1230 1231 // Get the new insert position for the node we care about. 1232 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1233 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1234 } 1235 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1236 VectorTypes.InsertNode(New, InsertPos); 1237 Types.push_back(New); 1238 return QualType(New, 0); 1239} 1240 1241/// getExtVectorType - Return the unique reference to an extended vector type of 1242/// the specified element type and size. VectorType must be a built-in type. 1243QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1244 BuiltinType *baseType; 1245 1246 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1247 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1248 1249 // Check if we've already instantiated a vector of this type. 1250 llvm::FoldingSetNodeID ID; 1251 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1252 void *InsertPos = 0; 1253 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1254 return QualType(VTP, 0); 1255 1256 // If the element type isn't canonical, this won't be a canonical type either, 1257 // so fill in the canonical type field. 1258 QualType Canonical; 1259 if (!vecType->isCanonical()) { 1260 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1261 1262 // Get the new insert position for the node we care about. 1263 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1264 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1265 } 1266 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1267 VectorTypes.InsertNode(New, InsertPos); 1268 Types.push_back(New); 1269 return QualType(New, 0); 1270} 1271 1272/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1273/// 1274QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) { 1275 // Unique functions, to guarantee there is only one function of a particular 1276 // structure. 1277 llvm::FoldingSetNodeID ID; 1278 FunctionNoProtoType::Profile(ID, ResultTy); 1279 1280 void *InsertPos = 0; 1281 if (FunctionNoProtoType *FT = 1282 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1283 return QualType(FT, 0); 1284 1285 QualType Canonical; 1286 if (!ResultTy->isCanonical()) { 1287 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy)); 1288 1289 // Get the new insert position for the node we care about. 1290 FunctionNoProtoType *NewIP = 1291 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1292 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1293 } 1294 1295 FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical); 1296 Types.push_back(New); 1297 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1298 return QualType(New, 0); 1299} 1300 1301/// getFunctionType - Return a normal function type with a typed argument 1302/// list. isVariadic indicates whether the argument list includes '...'. 1303QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1304 unsigned NumArgs, bool isVariadic, 1305 unsigned TypeQuals, bool hasExceptionSpec, 1306 bool hasAnyExceptionSpec, unsigned NumExs, 1307 const QualType *ExArray) { 1308 // Unique functions, to guarantee there is only one function of a particular 1309 // structure. 1310 llvm::FoldingSetNodeID ID; 1311 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1312 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1313 NumExs, ExArray); 1314 1315 void *InsertPos = 0; 1316 if (FunctionProtoType *FTP = 1317 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1318 return QualType(FTP, 0); 1319 1320 // Determine whether the type being created is already canonical or not. 1321 bool isCanonical = ResultTy->isCanonical(); 1322 if (hasExceptionSpec) 1323 isCanonical = false; 1324 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1325 if (!ArgArray[i]->isCanonical()) 1326 isCanonical = false; 1327 1328 // If this type isn't canonical, get the canonical version of it. 1329 // The exception spec is not part of the canonical type. 1330 QualType Canonical; 1331 if (!isCanonical) { 1332 llvm::SmallVector<QualType, 16> CanonicalArgs; 1333 CanonicalArgs.reserve(NumArgs); 1334 for (unsigned i = 0; i != NumArgs; ++i) 1335 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1336 1337 Canonical = getFunctionType(getCanonicalType(ResultTy), 1338 CanonicalArgs.data(), NumArgs, 1339 isVariadic, TypeQuals); 1340 1341 // Get the new insert position for the node we care about. 1342 FunctionProtoType *NewIP = 1343 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1344 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1345 } 1346 1347 // FunctionProtoType objects are allocated with extra bytes after them 1348 // for two variable size arrays (for parameter and exception types) at the 1349 // end of them. 1350 FunctionProtoType *FTP = 1351 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1352 NumArgs*sizeof(QualType) + 1353 NumExs*sizeof(QualType), 8); 1354 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1355 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1356 ExArray, NumExs, Canonical); 1357 Types.push_back(FTP); 1358 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1359 return QualType(FTP, 0); 1360} 1361 1362/// getTypeDeclType - Return the unique reference to the type for the 1363/// specified type declaration. 1364QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1365 assert(Decl && "Passed null for Decl param"); 1366 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1367 1368 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1369 return getTypedefType(Typedef); 1370 else if (isa<TemplateTypeParmDecl>(Decl)) { 1371 assert(false && "Template type parameter types are always available."); 1372 } else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1373 return getObjCInterfaceType(ObjCInterface); 1374 1375 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1376 if (PrevDecl) 1377 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1378 else 1379 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1380 } 1381 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1382 if (PrevDecl) 1383 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1384 else 1385 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1386 } 1387 else 1388 assert(false && "TypeDecl without a type?"); 1389 1390 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1391 return QualType(Decl->TypeForDecl, 0); 1392} 1393 1394/// getTypedefType - Return the unique reference to the type for the 1395/// specified typename decl. 1396QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1397 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1398 1399 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1400 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1401 Types.push_back(Decl->TypeForDecl); 1402 return QualType(Decl->TypeForDecl, 0); 1403} 1404 1405/// getObjCInterfaceType - Return the unique reference to the type for the 1406/// specified ObjC interface decl. 1407QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) { 1408 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1409 1410 ObjCInterfaceDecl *OID = const_cast<ObjCInterfaceDecl*>(Decl); 1411 Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, OID); 1412 Types.push_back(Decl->TypeForDecl); 1413 return QualType(Decl->TypeForDecl, 0); 1414} 1415 1416/// \brief Retrieve the template type parameter type for a template 1417/// parameter with the given depth, index, and (optionally) name. 1418QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1419 IdentifierInfo *Name) { 1420 llvm::FoldingSetNodeID ID; 1421 TemplateTypeParmType::Profile(ID, Depth, Index, Name); 1422 void *InsertPos = 0; 1423 TemplateTypeParmType *TypeParm 1424 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1425 1426 if (TypeParm) 1427 return QualType(TypeParm, 0); 1428 1429 if (Name) 1430 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, Name, 1431 getTemplateTypeParmType(Depth, Index)); 1432 else 1433 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index); 1434 1435 Types.push_back(TypeParm); 1436 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1437 1438 return QualType(TypeParm, 0); 1439} 1440 1441QualType 1442ASTContext::getTemplateSpecializationType(TemplateName Template, 1443 const TemplateArgument *Args, 1444 unsigned NumArgs, 1445 QualType Canon) { 1446 if (!Canon.isNull()) 1447 Canon = getCanonicalType(Canon); 1448 1449 llvm::FoldingSetNodeID ID; 1450 TemplateSpecializationType::Profile(ID, Template, Args, NumArgs); 1451 1452 void *InsertPos = 0; 1453 TemplateSpecializationType *Spec 1454 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1455 1456 if (Spec) 1457 return QualType(Spec, 0); 1458 1459 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1460 sizeof(TemplateArgument) * NumArgs), 1461 8); 1462 Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon); 1463 Types.push_back(Spec); 1464 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1465 1466 return QualType(Spec, 0); 1467} 1468 1469QualType 1470ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1471 QualType NamedType) { 1472 llvm::FoldingSetNodeID ID; 1473 QualifiedNameType::Profile(ID, NNS, NamedType); 1474 1475 void *InsertPos = 0; 1476 QualifiedNameType *T 1477 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1478 if (T) 1479 return QualType(T, 0); 1480 1481 T = new (*this) QualifiedNameType(NNS, NamedType, 1482 getCanonicalType(NamedType)); 1483 Types.push_back(T); 1484 QualifiedNameTypes.InsertNode(T, InsertPos); 1485 return QualType(T, 0); 1486} 1487 1488QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1489 const IdentifierInfo *Name, 1490 QualType Canon) { 1491 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1492 1493 if (Canon.isNull()) { 1494 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1495 if (CanonNNS != NNS) 1496 Canon = getTypenameType(CanonNNS, Name); 1497 } 1498 1499 llvm::FoldingSetNodeID ID; 1500 TypenameType::Profile(ID, NNS, Name); 1501 1502 void *InsertPos = 0; 1503 TypenameType *T 1504 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1505 if (T) 1506 return QualType(T, 0); 1507 1508 T = new (*this) TypenameType(NNS, Name, Canon); 1509 Types.push_back(T); 1510 TypenameTypes.InsertNode(T, InsertPos); 1511 return QualType(T, 0); 1512} 1513 1514QualType 1515ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1516 const TemplateSpecializationType *TemplateId, 1517 QualType Canon) { 1518 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1519 1520 if (Canon.isNull()) { 1521 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1522 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1523 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1524 const TemplateSpecializationType *CanonTemplateId 1525 = CanonType->getAsTemplateSpecializationType(); 1526 assert(CanonTemplateId && 1527 "Canonical type must also be a template specialization type"); 1528 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1529 } 1530 } 1531 1532 llvm::FoldingSetNodeID ID; 1533 TypenameType::Profile(ID, NNS, TemplateId); 1534 1535 void *InsertPos = 0; 1536 TypenameType *T 1537 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1538 if (T) 1539 return QualType(T, 0); 1540 1541 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1542 Types.push_back(T); 1543 TypenameTypes.InsertNode(T, InsertPos); 1544 return QualType(T, 0); 1545} 1546 1547/// CmpProtocolNames - Comparison predicate for sorting protocols 1548/// alphabetically. 1549static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1550 const ObjCProtocolDecl *RHS) { 1551 return LHS->getDeclName() < RHS->getDeclName(); 1552} 1553 1554static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1555 unsigned &NumProtocols) { 1556 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1557 1558 // Sort protocols, keyed by name. 1559 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1560 1561 // Remove duplicates. 1562 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1563 NumProtocols = ProtocolsEnd-Protocols; 1564} 1565 1566 1567/// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for 1568/// the given interface decl and the conforming protocol list. 1569QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 1570 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1571 // Sort the protocol list alphabetically to canonicalize it. 1572 SortAndUniqueProtocols(Protocols, NumProtocols); 1573 1574 llvm::FoldingSetNodeID ID; 1575 ObjCQualifiedInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1576 1577 void *InsertPos = 0; 1578 if (ObjCQualifiedInterfaceType *QT = 1579 ObjCQualifiedInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1580 return QualType(QT, 0); 1581 1582 // No Match; 1583 ObjCQualifiedInterfaceType *QType = 1584 new (*this,8) ObjCQualifiedInterfaceType(Decl, Protocols, NumProtocols); 1585 1586 Types.push_back(QType); 1587 ObjCQualifiedInterfaceTypes.InsertNode(QType, InsertPos); 1588 return QualType(QType, 0); 1589} 1590 1591/// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for the 'id' decl 1592/// and the conforming protocol list. 1593QualType ASTContext::getObjCQualifiedIdType(ObjCProtocolDecl **Protocols, 1594 unsigned NumProtocols) { 1595 // Sort the protocol list alphabetically to canonicalize it. 1596 SortAndUniqueProtocols(Protocols, NumProtocols); 1597 1598 llvm::FoldingSetNodeID ID; 1599 ObjCQualifiedIdType::Profile(ID, Protocols, NumProtocols); 1600 1601 void *InsertPos = 0; 1602 if (ObjCQualifiedIdType *QT = 1603 ObjCQualifiedIdTypes.FindNodeOrInsertPos(ID, InsertPos)) 1604 return QualType(QT, 0); 1605 1606 // No Match; 1607 ObjCQualifiedIdType *QType = 1608 new (*this,8) ObjCQualifiedIdType(Protocols, NumProtocols); 1609 Types.push_back(QType); 1610 ObjCQualifiedIdTypes.InsertNode(QType, InsertPos); 1611 return QualType(QType, 0); 1612} 1613 1614/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1615/// TypeOfExprType AST's (since expression's are never shared). For example, 1616/// multiple declarations that refer to "typeof(x)" all contain different 1617/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1618/// on canonical type's (which are always unique). 1619QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1620 QualType Canonical = getCanonicalType(tofExpr->getType()); 1621 TypeOfExprType *toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1622 Types.push_back(toe); 1623 return QualType(toe, 0); 1624} 1625 1626/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1627/// TypeOfType AST's. The only motivation to unique these nodes would be 1628/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1629/// an issue. This doesn't effect the type checker, since it operates 1630/// on canonical type's (which are always unique). 1631QualType ASTContext::getTypeOfType(QualType tofType) { 1632 QualType Canonical = getCanonicalType(tofType); 1633 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1634 Types.push_back(tot); 1635 return QualType(tot, 0); 1636} 1637 1638/// getTagDeclType - Return the unique reference to the type for the 1639/// specified TagDecl (struct/union/class/enum) decl. 1640QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1641 assert (Decl); 1642 return getTypeDeclType(Decl); 1643} 1644 1645/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1646/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1647/// needs to agree with the definition in <stddef.h>. 1648QualType ASTContext::getSizeType() const { 1649 return getFromTargetType(Target.getSizeType()); 1650} 1651 1652/// getSignedWCharType - Return the type of "signed wchar_t". 1653/// Used when in C++, as a GCC extension. 1654QualType ASTContext::getSignedWCharType() const { 1655 // FIXME: derive from "Target" ? 1656 return WCharTy; 1657} 1658 1659/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1660/// Used when in C++, as a GCC extension. 1661QualType ASTContext::getUnsignedWCharType() const { 1662 // FIXME: derive from "Target" ? 1663 return UnsignedIntTy; 1664} 1665 1666/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 1667/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 1668QualType ASTContext::getPointerDiffType() const { 1669 return getFromTargetType(Target.getPtrDiffType(0)); 1670} 1671 1672//===----------------------------------------------------------------------===// 1673// Type Operators 1674//===----------------------------------------------------------------------===// 1675 1676/// getCanonicalType - Return the canonical (structural) type corresponding to 1677/// the specified potentially non-canonical type. The non-canonical version 1678/// of a type may have many "decorated" versions of types. Decorators can 1679/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 1680/// to be free of any of these, allowing two canonical types to be compared 1681/// for exact equality with a simple pointer comparison. 1682QualType ASTContext::getCanonicalType(QualType T) { 1683 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 1684 1685 // If the result has type qualifiers, make sure to canonicalize them as well. 1686 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 1687 if (TypeQuals == 0) return CanType; 1688 1689 // If the type qualifiers are on an array type, get the canonical type of the 1690 // array with the qualifiers applied to the element type. 1691 ArrayType *AT = dyn_cast<ArrayType>(CanType); 1692 if (!AT) 1693 return CanType.getQualifiedType(TypeQuals); 1694 1695 // Get the canonical version of the element with the extra qualifiers on it. 1696 // This can recursively sink qualifiers through multiple levels of arrays. 1697 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 1698 NewEltTy = getCanonicalType(NewEltTy); 1699 1700 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1701 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 1702 CAT->getIndexTypeQualifier()); 1703 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 1704 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 1705 IAT->getIndexTypeQualifier()); 1706 1707 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 1708 return getDependentSizedArrayType(NewEltTy, DSAT->getSizeExpr(), 1709 DSAT->getSizeModifier(), 1710 DSAT->getIndexTypeQualifier()); 1711 1712 VariableArrayType *VAT = cast<VariableArrayType>(AT); 1713 return getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1714 VAT->getSizeModifier(), 1715 VAT->getIndexTypeQualifier()); 1716} 1717 1718Decl *ASTContext::getCanonicalDecl(Decl *D) { 1719 if (!D) 1720 return 0; 1721 1722 if (TagDecl *Tag = dyn_cast<TagDecl>(D)) { 1723 QualType T = getTagDeclType(Tag); 1724 return cast<TagDecl>(cast<TagType>(T.getTypePtr()->CanonicalType) 1725 ->getDecl()); 1726 } 1727 1728 if (ClassTemplateDecl *Template = dyn_cast<ClassTemplateDecl>(D)) { 1729 while (Template->getPreviousDeclaration()) 1730 Template = Template->getPreviousDeclaration(); 1731 return Template; 1732 } 1733 1734 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 1735 while (Function->getPreviousDeclaration()) 1736 Function = Function->getPreviousDeclaration(); 1737 return const_cast<FunctionDecl *>(Function); 1738 } 1739 1740 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 1741 while (Var->getPreviousDeclaration()) 1742 Var = Var->getPreviousDeclaration(); 1743 return const_cast<VarDecl *>(Var); 1744 } 1745 1746 return D; 1747} 1748 1749TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 1750 // If this template name refers to a template, the canonical 1751 // template name merely stores the template itself. 1752 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 1753 return TemplateName(cast<TemplateDecl>(getCanonicalDecl(Template))); 1754 1755 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 1756 assert(DTN && "Non-dependent template names must refer to template decls."); 1757 return DTN->CanonicalTemplateName; 1758} 1759 1760NestedNameSpecifier * 1761ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 1762 if (!NNS) 1763 return 0; 1764 1765 switch (NNS->getKind()) { 1766 case NestedNameSpecifier::Identifier: 1767 // Canonicalize the prefix but keep the identifier the same. 1768 return NestedNameSpecifier::Create(*this, 1769 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 1770 NNS->getAsIdentifier()); 1771 1772 case NestedNameSpecifier::Namespace: 1773 // A namespace is canonical; build a nested-name-specifier with 1774 // this namespace and no prefix. 1775 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 1776 1777 case NestedNameSpecifier::TypeSpec: 1778 case NestedNameSpecifier::TypeSpecWithTemplate: { 1779 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 1780 NestedNameSpecifier *Prefix = 0; 1781 1782 // FIXME: This isn't the right check! 1783 if (T->isDependentType()) 1784 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 1785 1786 return NestedNameSpecifier::Create(*this, Prefix, 1787 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 1788 T.getTypePtr()); 1789 } 1790 1791 case NestedNameSpecifier::Global: 1792 // The global specifier is canonical and unique. 1793 return NNS; 1794 } 1795 1796 // Required to silence a GCC warning 1797 return 0; 1798} 1799 1800 1801const ArrayType *ASTContext::getAsArrayType(QualType T) { 1802 // Handle the non-qualified case efficiently. 1803 if (T.getCVRQualifiers() == 0) { 1804 // Handle the common positive case fast. 1805 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 1806 return AT; 1807 } 1808 1809 // Handle the common negative case fast, ignoring CVR qualifiers. 1810 QualType CType = T->getCanonicalTypeInternal(); 1811 1812 // Make sure to look through type qualifiers (like ExtQuals) for the negative 1813 // test. 1814 if (!isa<ArrayType>(CType) && 1815 !isa<ArrayType>(CType.getUnqualifiedType())) 1816 return 0; 1817 1818 // Apply any CVR qualifiers from the array type to the element type. This 1819 // implements C99 6.7.3p8: "If the specification of an array type includes 1820 // any type qualifiers, the element type is so qualified, not the array type." 1821 1822 // If we get here, we either have type qualifiers on the type, or we have 1823 // sugar such as a typedef in the way. If we have type qualifiers on the type 1824 // we must propagate them down into the elemeng type. 1825 unsigned CVRQuals = T.getCVRQualifiers(); 1826 unsigned AddrSpace = 0; 1827 Type *Ty = T.getTypePtr(); 1828 1829 // Rip through ExtQualType's and typedefs to get to a concrete type. 1830 while (1) { 1831 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 1832 AddrSpace = EXTQT->getAddressSpace(); 1833 Ty = EXTQT->getBaseType(); 1834 } else { 1835 T = Ty->getDesugaredType(); 1836 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 1837 break; 1838 CVRQuals |= T.getCVRQualifiers(); 1839 Ty = T.getTypePtr(); 1840 } 1841 } 1842 1843 // If we have a simple case, just return now. 1844 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 1845 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 1846 return ATy; 1847 1848 // Otherwise, we have an array and we have qualifiers on it. Push the 1849 // qualifiers into the array element type and return a new array type. 1850 // Get the canonical version of the element with the extra qualifiers on it. 1851 // This can recursively sink qualifiers through multiple levels of arrays. 1852 QualType NewEltTy = ATy->getElementType(); 1853 if (AddrSpace) 1854 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 1855 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 1856 1857 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 1858 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 1859 CAT->getSizeModifier(), 1860 CAT->getIndexTypeQualifier())); 1861 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 1862 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 1863 IAT->getSizeModifier(), 1864 IAT->getIndexTypeQualifier())); 1865 1866 if (const DependentSizedArrayType *DSAT 1867 = dyn_cast<DependentSizedArrayType>(ATy)) 1868 return cast<ArrayType>( 1869 getDependentSizedArrayType(NewEltTy, 1870 DSAT->getSizeExpr(), 1871 DSAT->getSizeModifier(), 1872 DSAT->getIndexTypeQualifier())); 1873 1874 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 1875 return cast<ArrayType>(getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1876 VAT->getSizeModifier(), 1877 VAT->getIndexTypeQualifier())); 1878} 1879 1880 1881/// getArrayDecayedType - Return the properly qualified result of decaying the 1882/// specified array type to a pointer. This operation is non-trivial when 1883/// handling typedefs etc. The canonical type of "T" must be an array type, 1884/// this returns a pointer to a properly qualified element of the array. 1885/// 1886/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 1887QualType ASTContext::getArrayDecayedType(QualType Ty) { 1888 // Get the element type with 'getAsArrayType' so that we don't lose any 1889 // typedefs in the element type of the array. This also handles propagation 1890 // of type qualifiers from the array type into the element type if present 1891 // (C99 6.7.3p8). 1892 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 1893 assert(PrettyArrayType && "Not an array type!"); 1894 1895 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 1896 1897 // int x[restrict 4] -> int *restrict 1898 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 1899} 1900 1901QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 1902 QualType ElemTy = VAT->getElementType(); 1903 1904 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 1905 return getBaseElementType(VAT); 1906 1907 return ElemTy; 1908} 1909 1910/// getFloatingRank - Return a relative rank for floating point types. 1911/// This routine will assert if passed a built-in type that isn't a float. 1912static FloatingRank getFloatingRank(QualType T) { 1913 if (const ComplexType *CT = T->getAsComplexType()) 1914 return getFloatingRank(CT->getElementType()); 1915 1916 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 1917 switch (T->getAsBuiltinType()->getKind()) { 1918 default: assert(0 && "getFloatingRank(): not a floating type"); 1919 case BuiltinType::Float: return FloatRank; 1920 case BuiltinType::Double: return DoubleRank; 1921 case BuiltinType::LongDouble: return LongDoubleRank; 1922 } 1923} 1924 1925/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 1926/// point or a complex type (based on typeDomain/typeSize). 1927/// 'typeDomain' is a real floating point or complex type. 1928/// 'typeSize' is a real floating point or complex type. 1929QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 1930 QualType Domain) const { 1931 FloatingRank EltRank = getFloatingRank(Size); 1932 if (Domain->isComplexType()) { 1933 switch (EltRank) { 1934 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1935 case FloatRank: return FloatComplexTy; 1936 case DoubleRank: return DoubleComplexTy; 1937 case LongDoubleRank: return LongDoubleComplexTy; 1938 } 1939 } 1940 1941 assert(Domain->isRealFloatingType() && "Unknown domain!"); 1942 switch (EltRank) { 1943 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1944 case FloatRank: return FloatTy; 1945 case DoubleRank: return DoubleTy; 1946 case LongDoubleRank: return LongDoubleTy; 1947 } 1948} 1949 1950/// getFloatingTypeOrder - Compare the rank of the two specified floating 1951/// point types, ignoring the domain of the type (i.e. 'double' == 1952/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 1953/// LHS < RHS, return -1. 1954int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 1955 FloatingRank LHSR = getFloatingRank(LHS); 1956 FloatingRank RHSR = getFloatingRank(RHS); 1957 1958 if (LHSR == RHSR) 1959 return 0; 1960 if (LHSR > RHSR) 1961 return 1; 1962 return -1; 1963} 1964 1965/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 1966/// routine will assert if passed a built-in type that isn't an integer or enum, 1967/// or if it is not canonicalized. 1968unsigned ASTContext::getIntegerRank(Type *T) { 1969 assert(T->isCanonical() && "T should be canonicalized"); 1970 if (EnumType* ET = dyn_cast<EnumType>(T)) 1971 T = ET->getDecl()->getIntegerType().getTypePtr(); 1972 1973 // There are two things which impact the integer rank: the width, and 1974 // the ordering of builtins. The builtin ordering is encoded in the 1975 // bottom three bits; the width is encoded in the bits above that. 1976 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 1977 return FWIT->getWidth() << 3; 1978 1979 switch (cast<BuiltinType>(T)->getKind()) { 1980 default: assert(0 && "getIntegerRank(): not a built-in integer"); 1981 case BuiltinType::Bool: 1982 return 1 + (getIntWidth(BoolTy) << 3); 1983 case BuiltinType::Char_S: 1984 case BuiltinType::Char_U: 1985 case BuiltinType::SChar: 1986 case BuiltinType::UChar: 1987 return 2 + (getIntWidth(CharTy) << 3); 1988 case BuiltinType::Short: 1989 case BuiltinType::UShort: 1990 return 3 + (getIntWidth(ShortTy) << 3); 1991 case BuiltinType::Int: 1992 case BuiltinType::UInt: 1993 return 4 + (getIntWidth(IntTy) << 3); 1994 case BuiltinType::Long: 1995 case BuiltinType::ULong: 1996 return 5 + (getIntWidth(LongTy) << 3); 1997 case BuiltinType::LongLong: 1998 case BuiltinType::ULongLong: 1999 return 6 + (getIntWidth(LongLongTy) << 3); 2000 case BuiltinType::Int128: 2001 case BuiltinType::UInt128: 2002 return 7 + (getIntWidth(Int128Ty) << 3); 2003 } 2004} 2005 2006/// getIntegerTypeOrder - Returns the highest ranked integer type: 2007/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2008/// LHS < RHS, return -1. 2009int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2010 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2011 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2012 if (LHSC == RHSC) return 0; 2013 2014 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2015 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2016 2017 unsigned LHSRank = getIntegerRank(LHSC); 2018 unsigned RHSRank = getIntegerRank(RHSC); 2019 2020 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2021 if (LHSRank == RHSRank) return 0; 2022 return LHSRank > RHSRank ? 1 : -1; 2023 } 2024 2025 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2026 if (LHSUnsigned) { 2027 // If the unsigned [LHS] type is larger, return it. 2028 if (LHSRank >= RHSRank) 2029 return 1; 2030 2031 // If the signed type can represent all values of the unsigned type, it 2032 // wins. Because we are dealing with 2's complement and types that are 2033 // powers of two larger than each other, this is always safe. 2034 return -1; 2035 } 2036 2037 // If the unsigned [RHS] type is larger, return it. 2038 if (RHSRank >= LHSRank) 2039 return -1; 2040 2041 // If the signed type can represent all values of the unsigned type, it 2042 // wins. Because we are dealing with 2's complement and types that are 2043 // powers of two larger than each other, this is always safe. 2044 return 1; 2045} 2046 2047// getCFConstantStringType - Return the type used for constant CFStrings. 2048QualType ASTContext::getCFConstantStringType() { 2049 if (!CFConstantStringTypeDecl) { 2050 CFConstantStringTypeDecl = 2051 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2052 &Idents.get("NSConstantString")); 2053 QualType FieldTypes[4]; 2054 2055 // const int *isa; 2056 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2057 // int flags; 2058 FieldTypes[1] = IntTy; 2059 // const char *str; 2060 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2061 // long length; 2062 FieldTypes[3] = LongTy; 2063 2064 // Create fields 2065 for (unsigned i = 0; i < 4; ++i) { 2066 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2067 SourceLocation(), 0, 2068 FieldTypes[i], /*BitWidth=*/0, 2069 /*Mutable=*/false); 2070 CFConstantStringTypeDecl->addDecl(*this, Field); 2071 } 2072 2073 CFConstantStringTypeDecl->completeDefinition(*this); 2074 } 2075 2076 return getTagDeclType(CFConstantStringTypeDecl); 2077} 2078 2079void ASTContext::setCFConstantStringType(QualType T) { 2080 const RecordType *Rec = T->getAsRecordType(); 2081 assert(Rec && "Invalid CFConstantStringType"); 2082 CFConstantStringTypeDecl = Rec->getDecl(); 2083} 2084 2085QualType ASTContext::getObjCFastEnumerationStateType() 2086{ 2087 if (!ObjCFastEnumerationStateTypeDecl) { 2088 ObjCFastEnumerationStateTypeDecl = 2089 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2090 &Idents.get("__objcFastEnumerationState")); 2091 2092 QualType FieldTypes[] = { 2093 UnsignedLongTy, 2094 getPointerType(ObjCIdType), 2095 getPointerType(UnsignedLongTy), 2096 getConstantArrayType(UnsignedLongTy, 2097 llvm::APInt(32, 5), ArrayType::Normal, 0) 2098 }; 2099 2100 for (size_t i = 0; i < 4; ++i) { 2101 FieldDecl *Field = FieldDecl::Create(*this, 2102 ObjCFastEnumerationStateTypeDecl, 2103 SourceLocation(), 0, 2104 FieldTypes[i], /*BitWidth=*/0, 2105 /*Mutable=*/false); 2106 ObjCFastEnumerationStateTypeDecl->addDecl(*this, Field); 2107 } 2108 2109 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2110 } 2111 2112 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2113} 2114 2115void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2116 const RecordType *Rec = T->getAsRecordType(); 2117 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2118 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2119} 2120 2121// This returns true if a type has been typedefed to BOOL: 2122// typedef <type> BOOL; 2123static bool isTypeTypedefedAsBOOL(QualType T) { 2124 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2125 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2126 return II->isStr("BOOL"); 2127 2128 return false; 2129} 2130 2131/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2132/// purpose. 2133int ASTContext::getObjCEncodingTypeSize(QualType type) { 2134 uint64_t sz = getTypeSize(type); 2135 2136 // Make all integer and enum types at least as large as an int 2137 if (sz > 0 && type->isIntegralType()) 2138 sz = std::max(sz, getTypeSize(IntTy)); 2139 // Treat arrays as pointers, since that's how they're passed in. 2140 else if (type->isArrayType()) 2141 sz = getTypeSize(VoidPtrTy); 2142 return sz / getTypeSize(CharTy); 2143} 2144 2145/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2146/// declaration. 2147void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2148 std::string& S) { 2149 // FIXME: This is not very efficient. 2150 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2151 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2152 // Encode result type. 2153 getObjCEncodingForType(Decl->getResultType(), S); 2154 // Compute size of all parameters. 2155 // Start with computing size of a pointer in number of bytes. 2156 // FIXME: There might(should) be a better way of doing this computation! 2157 SourceLocation Loc; 2158 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2159 // The first two arguments (self and _cmd) are pointers; account for 2160 // their size. 2161 int ParmOffset = 2 * PtrSize; 2162 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2163 E = Decl->param_end(); PI != E; ++PI) { 2164 QualType PType = (*PI)->getType(); 2165 int sz = getObjCEncodingTypeSize(PType); 2166 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2167 ParmOffset += sz; 2168 } 2169 S += llvm::utostr(ParmOffset); 2170 S += "@0:"; 2171 S += llvm::utostr(PtrSize); 2172 2173 // Argument types. 2174 ParmOffset = 2 * PtrSize; 2175 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2176 E = Decl->param_end(); PI != E; ++PI) { 2177 ParmVarDecl *PVDecl = *PI; 2178 QualType PType = PVDecl->getOriginalType(); 2179 if (const ArrayType *AT = 2180 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2181 // Use array's original type only if it has known number of 2182 // elements. 2183 if (!isa<ConstantArrayType>(AT)) 2184 PType = PVDecl->getType(); 2185 } else if (PType->isFunctionType()) 2186 PType = PVDecl->getType(); 2187 // Process argument qualifiers for user supplied arguments; such as, 2188 // 'in', 'inout', etc. 2189 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2190 getObjCEncodingForType(PType, S); 2191 S += llvm::utostr(ParmOffset); 2192 ParmOffset += getObjCEncodingTypeSize(PType); 2193 } 2194} 2195 2196/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2197/// property declaration. If non-NULL, Container must be either an 2198/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2199/// NULL when getting encodings for protocol properties. 2200/// Property attributes are stored as a comma-delimited C string. The simple 2201/// attributes readonly and bycopy are encoded as single characters. The 2202/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2203/// encoded as single characters, followed by an identifier. Property types 2204/// are also encoded as a parametrized attribute. The characters used to encode 2205/// these attributes are defined by the following enumeration: 2206/// @code 2207/// enum PropertyAttributes { 2208/// kPropertyReadOnly = 'R', // property is read-only. 2209/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2210/// kPropertyByref = '&', // property is a reference to the value last assigned 2211/// kPropertyDynamic = 'D', // property is dynamic 2212/// kPropertyGetter = 'G', // followed by getter selector name 2213/// kPropertySetter = 'S', // followed by setter selector name 2214/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2215/// kPropertyType = 't' // followed by old-style type encoding. 2216/// kPropertyWeak = 'W' // 'weak' property 2217/// kPropertyStrong = 'P' // property GC'able 2218/// kPropertyNonAtomic = 'N' // property non-atomic 2219/// }; 2220/// @endcode 2221void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2222 const Decl *Container, 2223 std::string& S) { 2224 // Collect information from the property implementation decl(s). 2225 bool Dynamic = false; 2226 ObjCPropertyImplDecl *SynthesizePID = 0; 2227 2228 // FIXME: Duplicated code due to poor abstraction. 2229 if (Container) { 2230 if (const ObjCCategoryImplDecl *CID = 2231 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2232 for (ObjCCategoryImplDecl::propimpl_iterator 2233 i = CID->propimpl_begin(*this), e = CID->propimpl_end(*this); 2234 i != e; ++i) { 2235 ObjCPropertyImplDecl *PID = *i; 2236 if (PID->getPropertyDecl() == PD) { 2237 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2238 Dynamic = true; 2239 } else { 2240 SynthesizePID = PID; 2241 } 2242 } 2243 } 2244 } else { 2245 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2246 for (ObjCCategoryImplDecl::propimpl_iterator 2247 i = OID->propimpl_begin(*this), e = OID->propimpl_end(*this); 2248 i != e; ++i) { 2249 ObjCPropertyImplDecl *PID = *i; 2250 if (PID->getPropertyDecl() == PD) { 2251 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2252 Dynamic = true; 2253 } else { 2254 SynthesizePID = PID; 2255 } 2256 } 2257 } 2258 } 2259 } 2260 2261 // FIXME: This is not very efficient. 2262 S = "T"; 2263 2264 // Encode result type. 2265 // GCC has some special rules regarding encoding of properties which 2266 // closely resembles encoding of ivars. 2267 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2268 true /* outermost type */, 2269 true /* encoding for property */); 2270 2271 if (PD->isReadOnly()) { 2272 S += ",R"; 2273 } else { 2274 switch (PD->getSetterKind()) { 2275 case ObjCPropertyDecl::Assign: break; 2276 case ObjCPropertyDecl::Copy: S += ",C"; break; 2277 case ObjCPropertyDecl::Retain: S += ",&"; break; 2278 } 2279 } 2280 2281 // It really isn't clear at all what this means, since properties 2282 // are "dynamic by default". 2283 if (Dynamic) 2284 S += ",D"; 2285 2286 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2287 S += ",N"; 2288 2289 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2290 S += ",G"; 2291 S += PD->getGetterName().getAsString(); 2292 } 2293 2294 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2295 S += ",S"; 2296 S += PD->getSetterName().getAsString(); 2297 } 2298 2299 if (SynthesizePID) { 2300 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2301 S += ",V"; 2302 S += OID->getNameAsString(); 2303 } 2304 2305 // FIXME: OBJCGC: weak & strong 2306} 2307 2308/// getLegacyIntegralTypeEncoding - 2309/// Another legacy compatibility encoding: 32-bit longs are encoded as 2310/// 'l' or 'L' , but not always. For typedefs, we need to use 2311/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2312/// 2313void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2314 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 2315 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2316 if (BT->getKind() == BuiltinType::ULong && 2317 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2318 PointeeTy = UnsignedIntTy; 2319 else 2320 if (BT->getKind() == BuiltinType::Long && 2321 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2322 PointeeTy = IntTy; 2323 } 2324 } 2325} 2326 2327void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2328 const FieldDecl *Field) { 2329 // We follow the behavior of gcc, expanding structures which are 2330 // directly pointed to, and expanding embedded structures. Note that 2331 // these rules are sufficient to prevent recursive encoding of the 2332 // same type. 2333 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2334 true /* outermost type */); 2335} 2336 2337static void EncodeBitField(const ASTContext *Context, std::string& S, 2338 const FieldDecl *FD) { 2339 const Expr *E = FD->getBitWidth(); 2340 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2341 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2342 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2343 S += 'b'; 2344 S += llvm::utostr(N); 2345} 2346 2347void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2348 bool ExpandPointedToStructures, 2349 bool ExpandStructures, 2350 const FieldDecl *FD, 2351 bool OutermostType, 2352 bool EncodingProperty) { 2353 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2354 if (FD && FD->isBitField()) { 2355 EncodeBitField(this, S, FD); 2356 } 2357 else { 2358 char encoding; 2359 switch (BT->getKind()) { 2360 default: assert(0 && "Unhandled builtin type kind"); 2361 case BuiltinType::Void: encoding = 'v'; break; 2362 case BuiltinType::Bool: encoding = 'B'; break; 2363 case BuiltinType::Char_U: 2364 case BuiltinType::UChar: encoding = 'C'; break; 2365 case BuiltinType::UShort: encoding = 'S'; break; 2366 case BuiltinType::UInt: encoding = 'I'; break; 2367 case BuiltinType::ULong: 2368 encoding = 2369 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2370 break; 2371 case BuiltinType::UInt128: encoding = 'T'; break; 2372 case BuiltinType::ULongLong: encoding = 'Q'; break; 2373 case BuiltinType::Char_S: 2374 case BuiltinType::SChar: encoding = 'c'; break; 2375 case BuiltinType::Short: encoding = 's'; break; 2376 case BuiltinType::Int: encoding = 'i'; break; 2377 case BuiltinType::Long: 2378 encoding = 2379 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2380 break; 2381 case BuiltinType::LongLong: encoding = 'q'; break; 2382 case BuiltinType::Int128: encoding = 't'; break; 2383 case BuiltinType::Float: encoding = 'f'; break; 2384 case BuiltinType::Double: encoding = 'd'; break; 2385 case BuiltinType::LongDouble: encoding = 'd'; break; 2386 } 2387 2388 S += encoding; 2389 } 2390 } else if (const ComplexType *CT = T->getAsComplexType()) { 2391 S += 'j'; 2392 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2393 false); 2394 } else if (T->isObjCQualifiedIdType()) { 2395 getObjCEncodingForTypeImpl(getObjCIdType(), S, 2396 ExpandPointedToStructures, 2397 ExpandStructures, FD); 2398 if (FD || EncodingProperty) { 2399 // Note that we do extended encoding of protocol qualifer list 2400 // Only when doing ivar or property encoding. 2401 const ObjCQualifiedIdType *QIDT = T->getAsObjCQualifiedIdType(); 2402 S += '"'; 2403 for (ObjCQualifiedIdType::qual_iterator I = QIDT->qual_begin(), 2404 E = QIDT->qual_end(); I != E; ++I) { 2405 S += '<'; 2406 S += (*I)->getNameAsString(); 2407 S += '>'; 2408 } 2409 S += '"'; 2410 } 2411 return; 2412 } 2413 else if (const PointerType *PT = T->getAsPointerType()) { 2414 QualType PointeeTy = PT->getPointeeType(); 2415 bool isReadOnly = false; 2416 // For historical/compatibility reasons, the read-only qualifier of the 2417 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2418 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2419 // Also, do not emit the 'r' for anything but the outermost type! 2420 if (dyn_cast<TypedefType>(T.getTypePtr())) { 2421 if (OutermostType && T.isConstQualified()) { 2422 isReadOnly = true; 2423 S += 'r'; 2424 } 2425 } 2426 else if (OutermostType) { 2427 QualType P = PointeeTy; 2428 while (P->getAsPointerType()) 2429 P = P->getAsPointerType()->getPointeeType(); 2430 if (P.isConstQualified()) { 2431 isReadOnly = true; 2432 S += 'r'; 2433 } 2434 } 2435 if (isReadOnly) { 2436 // Another legacy compatibility encoding. Some ObjC qualifier and type 2437 // combinations need to be rearranged. 2438 // Rewrite "in const" from "nr" to "rn" 2439 const char * s = S.c_str(); 2440 int len = S.length(); 2441 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2442 std::string replace = "rn"; 2443 S.replace(S.end()-2, S.end(), replace); 2444 } 2445 } 2446 if (isObjCIdStructType(PointeeTy)) { 2447 S += '@'; 2448 return; 2449 } 2450 else if (PointeeTy->isObjCInterfaceType()) { 2451 if (!EncodingProperty && 2452 isa<TypedefType>(PointeeTy.getTypePtr())) { 2453 // Another historical/compatibility reason. 2454 // We encode the underlying type which comes out as 2455 // {...}; 2456 S += '^'; 2457 getObjCEncodingForTypeImpl(PointeeTy, S, 2458 false, ExpandPointedToStructures, 2459 NULL); 2460 return; 2461 } 2462 S += '@'; 2463 if (FD || EncodingProperty) { 2464 const ObjCInterfaceType *OIT = 2465 PointeeTy.getUnqualifiedType()->getAsObjCInterfaceType(); 2466 ObjCInterfaceDecl *OI = OIT->getDecl(); 2467 S += '"'; 2468 S += OI->getNameAsCString(); 2469 for (ObjCInterfaceType::qual_iterator I = OIT->qual_begin(), 2470 E = OIT->qual_end(); I != E; ++I) { 2471 S += '<'; 2472 S += (*I)->getNameAsString(); 2473 S += '>'; 2474 } 2475 S += '"'; 2476 } 2477 return; 2478 } else if (isObjCClassStructType(PointeeTy)) { 2479 S += '#'; 2480 return; 2481 } else if (isObjCSelType(PointeeTy)) { 2482 S += ':'; 2483 return; 2484 } 2485 2486 if (PointeeTy->isCharType()) { 2487 // char pointer types should be encoded as '*' unless it is a 2488 // type that has been typedef'd to 'BOOL'. 2489 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2490 S += '*'; 2491 return; 2492 } 2493 } 2494 2495 S += '^'; 2496 getLegacyIntegralTypeEncoding(PointeeTy); 2497 2498 getObjCEncodingForTypeImpl(PointeeTy, S, 2499 false, ExpandPointedToStructures, 2500 NULL); 2501 } else if (const ArrayType *AT = 2502 // Ignore type qualifiers etc. 2503 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2504 if (isa<IncompleteArrayType>(AT)) { 2505 // Incomplete arrays are encoded as a pointer to the array element. 2506 S += '^'; 2507 2508 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2509 false, ExpandStructures, FD); 2510 } else { 2511 S += '['; 2512 2513 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2514 S += llvm::utostr(CAT->getSize().getZExtValue()); 2515 else { 2516 //Variable length arrays are encoded as a regular array with 0 elements. 2517 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2518 S += '0'; 2519 } 2520 2521 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2522 false, ExpandStructures, FD); 2523 S += ']'; 2524 } 2525 } else if (T->getAsFunctionType()) { 2526 S += '?'; 2527 } else if (const RecordType *RTy = T->getAsRecordType()) { 2528 RecordDecl *RDecl = RTy->getDecl(); 2529 S += RDecl->isUnion() ? '(' : '{'; 2530 // Anonymous structures print as '?' 2531 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2532 S += II->getName(); 2533 } else { 2534 S += '?'; 2535 } 2536 if (ExpandStructures) { 2537 S += '='; 2538 for (RecordDecl::field_iterator Field = RDecl->field_begin(*this), 2539 FieldEnd = RDecl->field_end(*this); 2540 Field != FieldEnd; ++Field) { 2541 if (FD) { 2542 S += '"'; 2543 S += Field->getNameAsString(); 2544 S += '"'; 2545 } 2546 2547 // Special case bit-fields. 2548 if (Field->isBitField()) { 2549 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2550 (*Field)); 2551 } else { 2552 QualType qt = Field->getType(); 2553 getLegacyIntegralTypeEncoding(qt); 2554 getObjCEncodingForTypeImpl(qt, S, false, true, 2555 FD); 2556 } 2557 } 2558 } 2559 S += RDecl->isUnion() ? ')' : '}'; 2560 } else if (T->isEnumeralType()) { 2561 if (FD && FD->isBitField()) 2562 EncodeBitField(this, S, FD); 2563 else 2564 S += 'i'; 2565 } else if (T->isBlockPointerType()) { 2566 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2567 } else if (T->isObjCInterfaceType()) { 2568 // @encode(class_name) 2569 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2570 S += '{'; 2571 const IdentifierInfo *II = OI->getIdentifier(); 2572 S += II->getName(); 2573 S += '='; 2574 llvm::SmallVector<FieldDecl*, 32> RecFields; 2575 CollectObjCIvars(OI, RecFields); 2576 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2577 if (RecFields[i]->isBitField()) 2578 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2579 RecFields[i]); 2580 else 2581 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2582 FD); 2583 } 2584 S += '}'; 2585 } 2586 else 2587 assert(0 && "@encode for type not implemented!"); 2588} 2589 2590void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2591 std::string& S) const { 2592 if (QT & Decl::OBJC_TQ_In) 2593 S += 'n'; 2594 if (QT & Decl::OBJC_TQ_Inout) 2595 S += 'N'; 2596 if (QT & Decl::OBJC_TQ_Out) 2597 S += 'o'; 2598 if (QT & Decl::OBJC_TQ_Bycopy) 2599 S += 'O'; 2600 if (QT & Decl::OBJC_TQ_Byref) 2601 S += 'R'; 2602 if (QT & Decl::OBJC_TQ_Oneway) 2603 S += 'V'; 2604} 2605 2606void ASTContext::setBuiltinVaListType(QualType T) 2607{ 2608 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2609 2610 BuiltinVaListType = T; 2611} 2612 2613void ASTContext::setObjCIdType(QualType T) 2614{ 2615 ObjCIdType = T; 2616 2617 const TypedefType *TT = T->getAsTypedefType(); 2618 if (!TT) 2619 return; 2620 2621 TypedefDecl *TD = TT->getDecl(); 2622 2623 // typedef struct objc_object *id; 2624 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2625 // User error - caller will issue diagnostics. 2626 if (!ptr) 2627 return; 2628 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2629 // User error - caller will issue diagnostics. 2630 if (!rec) 2631 return; 2632 IdStructType = rec; 2633} 2634 2635void ASTContext::setObjCSelType(QualType T) 2636{ 2637 ObjCSelType = T; 2638 2639 const TypedefType *TT = T->getAsTypedefType(); 2640 if (!TT) 2641 return; 2642 TypedefDecl *TD = TT->getDecl(); 2643 2644 // typedef struct objc_selector *SEL; 2645 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2646 if (!ptr) 2647 return; 2648 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2649 if (!rec) 2650 return; 2651 SelStructType = rec; 2652} 2653 2654void ASTContext::setObjCProtoType(QualType QT) 2655{ 2656 ObjCProtoType = QT; 2657} 2658 2659void ASTContext::setObjCClassType(QualType T) 2660{ 2661 ObjCClassType = T; 2662 2663 const TypedefType *TT = T->getAsTypedefType(); 2664 if (!TT) 2665 return; 2666 TypedefDecl *TD = TT->getDecl(); 2667 2668 // typedef struct objc_class *Class; 2669 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2670 assert(ptr && "'Class' incorrectly typed"); 2671 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2672 assert(rec && "'Class' incorrectly typed"); 2673 ClassStructType = rec; 2674} 2675 2676void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 2677 assert(ObjCConstantStringType.isNull() && 2678 "'NSConstantString' type already set!"); 2679 2680 ObjCConstantStringType = getObjCInterfaceType(Decl); 2681} 2682 2683/// \brief Retrieve the template name that represents a qualified 2684/// template name such as \c std::vector. 2685TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 2686 bool TemplateKeyword, 2687 TemplateDecl *Template) { 2688 llvm::FoldingSetNodeID ID; 2689 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 2690 2691 void *InsertPos = 0; 2692 QualifiedTemplateName *QTN = 2693 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2694 if (!QTN) { 2695 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 2696 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 2697 } 2698 2699 return TemplateName(QTN); 2700} 2701 2702/// \brief Retrieve the template name that represents a dependent 2703/// template name such as \c MetaFun::template apply. 2704TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 2705 const IdentifierInfo *Name) { 2706 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 2707 2708 llvm::FoldingSetNodeID ID; 2709 DependentTemplateName::Profile(ID, NNS, Name); 2710 2711 void *InsertPos = 0; 2712 DependentTemplateName *QTN = 2713 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2714 2715 if (QTN) 2716 return TemplateName(QTN); 2717 2718 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2719 if (CanonNNS == NNS) { 2720 QTN = new (*this,4) DependentTemplateName(NNS, Name); 2721 } else { 2722 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 2723 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 2724 } 2725 2726 DependentTemplateNames.InsertNode(QTN, InsertPos); 2727 return TemplateName(QTN); 2728} 2729 2730/// getFromTargetType - Given one of the integer types provided by 2731/// TargetInfo, produce the corresponding type. The unsigned @p Type 2732/// is actually a value of type @c TargetInfo::IntType. 2733QualType ASTContext::getFromTargetType(unsigned Type) const { 2734 switch (Type) { 2735 case TargetInfo::NoInt: return QualType(); 2736 case TargetInfo::SignedShort: return ShortTy; 2737 case TargetInfo::UnsignedShort: return UnsignedShortTy; 2738 case TargetInfo::SignedInt: return IntTy; 2739 case TargetInfo::UnsignedInt: return UnsignedIntTy; 2740 case TargetInfo::SignedLong: return LongTy; 2741 case TargetInfo::UnsignedLong: return UnsignedLongTy; 2742 case TargetInfo::SignedLongLong: return LongLongTy; 2743 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 2744 } 2745 2746 assert(false && "Unhandled TargetInfo::IntType value"); 2747 return QualType(); 2748} 2749 2750//===----------------------------------------------------------------------===// 2751// Type Predicates. 2752//===----------------------------------------------------------------------===// 2753 2754/// isObjCNSObjectType - Return true if this is an NSObject object using 2755/// NSObject attribute on a c-style pointer type. 2756/// FIXME - Make it work directly on types. 2757/// 2758bool ASTContext::isObjCNSObjectType(QualType Ty) const { 2759 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2760 if (TypedefDecl *TD = TDT->getDecl()) 2761 if (TD->getAttr<ObjCNSObjectAttr>()) 2762 return true; 2763 } 2764 return false; 2765} 2766 2767/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 2768/// to an object type. This includes "id" and "Class" (two 'special' pointers 2769/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 2770/// ID type). 2771bool ASTContext::isObjCObjectPointerType(QualType Ty) const { 2772 if (Ty->isObjCQualifiedIdType()) 2773 return true; 2774 2775 // Blocks are objects. 2776 if (Ty->isBlockPointerType()) 2777 return true; 2778 2779 // All other object types are pointers. 2780 const PointerType *PT = Ty->getAsPointerType(); 2781 if (PT == 0) 2782 return false; 2783 2784 // If this a pointer to an interface (e.g. NSString*), it is ok. 2785 if (PT->getPointeeType()->isObjCInterfaceType() || 2786 // If is has NSObject attribute, OK as well. 2787 isObjCNSObjectType(Ty)) 2788 return true; 2789 2790 // Check to see if this is 'id' or 'Class', both of which are typedefs for 2791 // pointer types. This looks for the typedef specifically, not for the 2792 // underlying type. Iteratively strip off typedefs so that we can handle 2793 // typedefs of typedefs. 2794 while (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2795 if (Ty.getUnqualifiedType() == getObjCIdType() || 2796 Ty.getUnqualifiedType() == getObjCClassType()) 2797 return true; 2798 2799 Ty = TDT->getDecl()->getUnderlyingType(); 2800 } 2801 2802 return false; 2803} 2804 2805/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 2806/// garbage collection attribute. 2807/// 2808QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 2809 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 2810 if (getLangOptions().ObjC1 && 2811 getLangOptions().getGCMode() != LangOptions::NonGC) { 2812 GCAttrs = Ty.getObjCGCAttr(); 2813 // Default behavious under objective-c's gc is for objective-c pointers 2814 // (or pointers to them) be treated as though they were declared 2815 // as __strong. 2816 if (GCAttrs == QualType::GCNone) { 2817 if (isObjCObjectPointerType(Ty)) 2818 GCAttrs = QualType::Strong; 2819 else if (Ty->isPointerType()) 2820 return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType()); 2821 } 2822 // Non-pointers have none gc'able attribute regardless of the attribute 2823 // set on them. 2824 else if (!Ty->isPointerType() && !isObjCObjectPointerType(Ty)) 2825 return QualType::GCNone; 2826 } 2827 return GCAttrs; 2828} 2829 2830//===----------------------------------------------------------------------===// 2831// Type Compatibility Testing 2832//===----------------------------------------------------------------------===// 2833 2834/// areCompatVectorTypes - Return true if the two specified vector types are 2835/// compatible. 2836static bool areCompatVectorTypes(const VectorType *LHS, 2837 const VectorType *RHS) { 2838 assert(LHS->isCanonical() && RHS->isCanonical()); 2839 return LHS->getElementType() == RHS->getElementType() && 2840 LHS->getNumElements() == RHS->getNumElements(); 2841} 2842 2843/// canAssignObjCInterfaces - Return true if the two interface types are 2844/// compatible for assignment from RHS to LHS. This handles validation of any 2845/// protocol qualifiers on the LHS or RHS. 2846/// 2847bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 2848 const ObjCInterfaceType *RHS) { 2849 // Verify that the base decls are compatible: the RHS must be a subclass of 2850 // the LHS. 2851 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 2852 return false; 2853 2854 // RHS must have a superset of the protocols in the LHS. If the LHS is not 2855 // protocol qualified at all, then we are good. 2856 if (!isa<ObjCQualifiedInterfaceType>(LHS)) 2857 return true; 2858 2859 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 2860 // isn't a superset. 2861 if (!isa<ObjCQualifiedInterfaceType>(RHS)) 2862 return true; // FIXME: should return false! 2863 2864 // Finally, we must have two protocol-qualified interfaces. 2865 const ObjCQualifiedInterfaceType *LHSP =cast<ObjCQualifiedInterfaceType>(LHS); 2866 const ObjCQualifiedInterfaceType *RHSP =cast<ObjCQualifiedInterfaceType>(RHS); 2867 2868 // All LHS protocols must have a presence on the RHS. 2869 assert(LHSP->qual_begin() != LHSP->qual_end() && "Empty LHS protocol list?"); 2870 2871 for (ObjCQualifiedInterfaceType::qual_iterator LHSPI = LHSP->qual_begin(), 2872 LHSPE = LHSP->qual_end(); 2873 LHSPI != LHSPE; LHSPI++) { 2874 bool RHSImplementsProtocol = false; 2875 2876 // If the RHS doesn't implement the protocol on the left, the types 2877 // are incompatible. 2878 for (ObjCQualifiedInterfaceType::qual_iterator RHSPI = RHSP->qual_begin(), 2879 RHSPE = RHSP->qual_end(); 2880 !RHSImplementsProtocol && (RHSPI != RHSPE); RHSPI++) { 2881 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) 2882 RHSImplementsProtocol = true; 2883 } 2884 // FIXME: For better diagnostics, consider passing back the protocol name. 2885 if (!RHSImplementsProtocol) 2886 return false; 2887 } 2888 // The RHS implements all protocols listed on the LHS. 2889 return true; 2890} 2891 2892bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 2893 // get the "pointed to" types 2894 const PointerType *LHSPT = LHS->getAsPointerType(); 2895 const PointerType *RHSPT = RHS->getAsPointerType(); 2896 2897 if (!LHSPT || !RHSPT) 2898 return false; 2899 2900 QualType lhptee = LHSPT->getPointeeType(); 2901 QualType rhptee = RHSPT->getPointeeType(); 2902 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2903 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2904 // ID acts sort of like void* for ObjC interfaces 2905 if (LHSIface && isObjCIdStructType(rhptee)) 2906 return true; 2907 if (RHSIface && isObjCIdStructType(lhptee)) 2908 return true; 2909 if (!LHSIface || !RHSIface) 2910 return false; 2911 return canAssignObjCInterfaces(LHSIface, RHSIface) || 2912 canAssignObjCInterfaces(RHSIface, LHSIface); 2913} 2914 2915/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 2916/// both shall have the identically qualified version of a compatible type. 2917/// C99 6.2.7p1: Two types have compatible types if their types are the 2918/// same. See 6.7.[2,3,5] for additional rules. 2919bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 2920 return !mergeTypes(LHS, RHS).isNull(); 2921} 2922 2923QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 2924 const FunctionType *lbase = lhs->getAsFunctionType(); 2925 const FunctionType *rbase = rhs->getAsFunctionType(); 2926 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 2927 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 2928 bool allLTypes = true; 2929 bool allRTypes = true; 2930 2931 // Check return type 2932 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 2933 if (retType.isNull()) return QualType(); 2934 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 2935 allLTypes = false; 2936 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 2937 allRTypes = false; 2938 2939 if (lproto && rproto) { // two C99 style function prototypes 2940 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 2941 "C++ shouldn't be here"); 2942 unsigned lproto_nargs = lproto->getNumArgs(); 2943 unsigned rproto_nargs = rproto->getNumArgs(); 2944 2945 // Compatible functions must have the same number of arguments 2946 if (lproto_nargs != rproto_nargs) 2947 return QualType(); 2948 2949 // Variadic and non-variadic functions aren't compatible 2950 if (lproto->isVariadic() != rproto->isVariadic()) 2951 return QualType(); 2952 2953 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 2954 return QualType(); 2955 2956 // Check argument compatibility 2957 llvm::SmallVector<QualType, 10> types; 2958 for (unsigned i = 0; i < lproto_nargs; i++) { 2959 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 2960 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 2961 QualType argtype = mergeTypes(largtype, rargtype); 2962 if (argtype.isNull()) return QualType(); 2963 types.push_back(argtype); 2964 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 2965 allLTypes = false; 2966 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 2967 allRTypes = false; 2968 } 2969 if (allLTypes) return lhs; 2970 if (allRTypes) return rhs; 2971 return getFunctionType(retType, types.begin(), types.size(), 2972 lproto->isVariadic(), lproto->getTypeQuals()); 2973 } 2974 2975 if (lproto) allRTypes = false; 2976 if (rproto) allLTypes = false; 2977 2978 const FunctionProtoType *proto = lproto ? lproto : rproto; 2979 if (proto) { 2980 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 2981 if (proto->isVariadic()) return QualType(); 2982 // Check that the types are compatible with the types that 2983 // would result from default argument promotions (C99 6.7.5.3p15). 2984 // The only types actually affected are promotable integer 2985 // types and floats, which would be passed as a different 2986 // type depending on whether the prototype is visible. 2987 unsigned proto_nargs = proto->getNumArgs(); 2988 for (unsigned i = 0; i < proto_nargs; ++i) { 2989 QualType argTy = proto->getArgType(i); 2990 if (argTy->isPromotableIntegerType() || 2991 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 2992 return QualType(); 2993 } 2994 2995 if (allLTypes) return lhs; 2996 if (allRTypes) return rhs; 2997 return getFunctionType(retType, proto->arg_type_begin(), 2998 proto->getNumArgs(), lproto->isVariadic(), 2999 lproto->getTypeQuals()); 3000 } 3001 3002 if (allLTypes) return lhs; 3003 if (allRTypes) return rhs; 3004 return getFunctionNoProtoType(retType); 3005} 3006 3007QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3008 // C++ [expr]: If an expression initially has the type "reference to T", the 3009 // type is adjusted to "T" prior to any further analysis, the expression 3010 // designates the object or function denoted by the reference, and the 3011 // expression is an lvalue unless the reference is an rvalue reference and 3012 // the expression is a function call (possibly inside parentheses). 3013 // FIXME: C++ shouldn't be going through here! The rules are different 3014 // enough that they should be handled separately. 3015 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3016 // shouldn't be going through here! 3017 if (const ReferenceType *RT = LHS->getAsReferenceType()) 3018 LHS = RT->getPointeeType(); 3019 if (const ReferenceType *RT = RHS->getAsReferenceType()) 3020 RHS = RT->getPointeeType(); 3021 3022 QualType LHSCan = getCanonicalType(LHS), 3023 RHSCan = getCanonicalType(RHS); 3024 3025 // If two types are identical, they are compatible. 3026 if (LHSCan == RHSCan) 3027 return LHS; 3028 3029 // If the qualifiers are different, the types aren't compatible 3030 // Note that we handle extended qualifiers later, in the 3031 // case for ExtQualType. 3032 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3033 return QualType(); 3034 3035 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3036 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3037 3038 // We want to consider the two function types to be the same for these 3039 // comparisons, just force one to the other. 3040 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3041 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3042 3043 // Strip off objc_gc attributes off the top level so they can be merged. 3044 // This is a complete mess, but the attribute itself doesn't make much sense. 3045 if (RHSClass == Type::ExtQual) { 3046 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3047 if (GCAttr != QualType::GCNone) { 3048 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3049 // __weak attribute must appear on both declarations. 3050 // __strong attribue is redundant if other decl is an objective-c 3051 // object pointer (or decorated with __strong attribute); otherwise 3052 // issue error. 3053 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3054 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3055 LHSCan->isPointerType() && !isObjCObjectPointerType(LHSCan) && 3056 !isObjCIdStructType(LHSCan->getAsPointerType()->getPointeeType()))) 3057 return QualType(); 3058 3059 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3060 RHS.getCVRQualifiers()); 3061 QualType Result = mergeTypes(LHS, RHS); 3062 if (!Result.isNull()) { 3063 if (Result.getObjCGCAttr() == QualType::GCNone) 3064 Result = getObjCGCQualType(Result, GCAttr); 3065 else if (Result.getObjCGCAttr() != GCAttr) 3066 Result = QualType(); 3067 } 3068 return Result; 3069 } 3070 } 3071 if (LHSClass == Type::ExtQual) { 3072 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3073 if (GCAttr != QualType::GCNone) { 3074 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3075 // __weak attribute must appear on both declarations. __strong 3076 // __strong attribue is redundant if other decl is an objective-c 3077 // object pointer (or decorated with __strong attribute); otherwise 3078 // issue error. 3079 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3080 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3081 RHSCan->isPointerType() && !isObjCObjectPointerType(RHSCan) && 3082 !isObjCIdStructType(RHSCan->getAsPointerType()->getPointeeType()))) 3083 return QualType(); 3084 3085 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3086 LHS.getCVRQualifiers()); 3087 QualType Result = mergeTypes(LHS, RHS); 3088 if (!Result.isNull()) { 3089 if (Result.getObjCGCAttr() == QualType::GCNone) 3090 Result = getObjCGCQualType(Result, GCAttr); 3091 else if (Result.getObjCGCAttr() != GCAttr) 3092 Result = QualType(); 3093 } 3094 return Result; 3095 } 3096 } 3097 3098 // Same as above for arrays 3099 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3100 LHSClass = Type::ConstantArray; 3101 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3102 RHSClass = Type::ConstantArray; 3103 3104 // Canonicalize ExtVector -> Vector. 3105 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3106 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3107 3108 // Consider qualified interfaces and interfaces the same. 3109 if (LHSClass == Type::ObjCQualifiedInterface) LHSClass = Type::ObjCInterface; 3110 if (RHSClass == Type::ObjCQualifiedInterface) RHSClass = Type::ObjCInterface; 3111 3112 // If the canonical type classes don't match. 3113 if (LHSClass != RHSClass) { 3114 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3115 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3116 3117 // 'id' and 'Class' act sort of like void* for ObjC interfaces 3118 if (LHSIface && (isObjCIdStructType(RHS) || isObjCClassStructType(RHS))) 3119 return LHS; 3120 if (RHSIface && (isObjCIdStructType(LHS) || isObjCClassStructType(LHS))) 3121 return RHS; 3122 3123 // ID is compatible with all qualified id types. 3124 if (LHS->isObjCQualifiedIdType()) { 3125 if (const PointerType *PT = RHS->getAsPointerType()) { 3126 QualType pType = PT->getPointeeType(); 3127 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3128 return LHS; 3129 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3130 // Unfortunately, this API is part of Sema (which we don't have access 3131 // to. Need to refactor. The following check is insufficient, since we 3132 // need to make sure the class implements the protocol. 3133 if (pType->isObjCInterfaceType()) 3134 return LHS; 3135 } 3136 } 3137 if (RHS->isObjCQualifiedIdType()) { 3138 if (const PointerType *PT = LHS->getAsPointerType()) { 3139 QualType pType = PT->getPointeeType(); 3140 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3141 return RHS; 3142 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3143 // Unfortunately, this API is part of Sema (which we don't have access 3144 // to. Need to refactor. The following check is insufficient, since we 3145 // need to make sure the class implements the protocol. 3146 if (pType->isObjCInterfaceType()) 3147 return RHS; 3148 } 3149 } 3150 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3151 // a signed integer type, or an unsigned integer type. 3152 if (const EnumType* ETy = LHS->getAsEnumType()) { 3153 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3154 return RHS; 3155 } 3156 if (const EnumType* ETy = RHS->getAsEnumType()) { 3157 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3158 return LHS; 3159 } 3160 3161 return QualType(); 3162 } 3163 3164 // The canonical type classes match. 3165 switch (LHSClass) { 3166#define TYPE(Class, Base) 3167#define ABSTRACT_TYPE(Class, Base) 3168#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3169#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3170#include "clang/AST/TypeNodes.def" 3171 assert(false && "Non-canonical and dependent types shouldn't get here"); 3172 return QualType(); 3173 3174 case Type::LValueReference: 3175 case Type::RValueReference: 3176 case Type::MemberPointer: 3177 assert(false && "C++ should never be in mergeTypes"); 3178 return QualType(); 3179 3180 case Type::IncompleteArray: 3181 case Type::VariableArray: 3182 case Type::FunctionProto: 3183 case Type::ExtVector: 3184 case Type::ObjCQualifiedInterface: 3185 assert(false && "Types are eliminated above"); 3186 return QualType(); 3187 3188 case Type::Pointer: 3189 { 3190 // Merge two pointer types, while trying to preserve typedef info 3191 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 3192 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 3193 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3194 if (ResultType.isNull()) return QualType(); 3195 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3196 return LHS; 3197 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3198 return RHS; 3199 return getPointerType(ResultType); 3200 } 3201 case Type::BlockPointer: 3202 { 3203 // Merge two block pointer types, while trying to preserve typedef info 3204 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 3205 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 3206 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3207 if (ResultType.isNull()) return QualType(); 3208 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3209 return LHS; 3210 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3211 return RHS; 3212 return getBlockPointerType(ResultType); 3213 } 3214 case Type::ConstantArray: 3215 { 3216 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3217 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3218 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3219 return QualType(); 3220 3221 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3222 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3223 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3224 if (ResultType.isNull()) return QualType(); 3225 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3226 return LHS; 3227 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3228 return RHS; 3229 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3230 ArrayType::ArraySizeModifier(), 0); 3231 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3232 ArrayType::ArraySizeModifier(), 0); 3233 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3234 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3235 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3236 return LHS; 3237 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3238 return RHS; 3239 if (LVAT) { 3240 // FIXME: This isn't correct! But tricky to implement because 3241 // the array's size has to be the size of LHS, but the type 3242 // has to be different. 3243 return LHS; 3244 } 3245 if (RVAT) { 3246 // FIXME: This isn't correct! But tricky to implement because 3247 // the array's size has to be the size of RHS, but the type 3248 // has to be different. 3249 return RHS; 3250 } 3251 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3252 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3253 return getIncompleteArrayType(ResultType, ArrayType::ArraySizeModifier(),0); 3254 } 3255 case Type::FunctionNoProto: 3256 return mergeFunctionTypes(LHS, RHS); 3257 case Type::Record: 3258 case Type::Enum: 3259 // FIXME: Why are these compatible? 3260 if (isObjCIdStructType(LHS) && isObjCClassStructType(RHS)) return LHS; 3261 if (isObjCClassStructType(LHS) && isObjCIdStructType(RHS)) return LHS; 3262 return QualType(); 3263 case Type::Builtin: 3264 // Only exactly equal builtin types are compatible, which is tested above. 3265 return QualType(); 3266 case Type::Complex: 3267 // Distinct complex types are incompatible. 3268 return QualType(); 3269 case Type::Vector: 3270 // FIXME: The merged type should be an ExtVector! 3271 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3272 return LHS; 3273 return QualType(); 3274 case Type::ObjCInterface: { 3275 // Check if the interfaces are assignment compatible. 3276 // FIXME: This should be type compatibility, e.g. whether 3277 // "LHS x; RHS x;" at global scope is legal. 3278 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3279 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3280 if (LHSIface && RHSIface && 3281 canAssignObjCInterfaces(LHSIface, RHSIface)) 3282 return LHS; 3283 3284 return QualType(); 3285 } 3286 case Type::ObjCQualifiedId: 3287 // Distinct qualified id's are not compatible. 3288 return QualType(); 3289 case Type::FixedWidthInt: 3290 // Distinct fixed-width integers are not compatible. 3291 return QualType(); 3292 case Type::ExtQual: 3293 // FIXME: ExtQual types can be compatible even if they're not 3294 // identical! 3295 return QualType(); 3296 // First attempt at an implementation, but I'm not really sure it's 3297 // right... 3298#if 0 3299 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3300 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3301 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3302 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3303 return QualType(); 3304 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3305 LHSBase = QualType(LQual->getBaseType(), 0); 3306 RHSBase = QualType(RQual->getBaseType(), 0); 3307 ResultType = mergeTypes(LHSBase, RHSBase); 3308 if (ResultType.isNull()) return QualType(); 3309 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3310 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3311 return LHS; 3312 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3313 return RHS; 3314 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3315 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3316 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3317 return ResultType; 3318#endif 3319 3320 case Type::TemplateSpecialization: 3321 assert(false && "Dependent types have no size"); 3322 break; 3323 } 3324 3325 return QualType(); 3326} 3327 3328//===----------------------------------------------------------------------===// 3329// Integer Predicates 3330//===----------------------------------------------------------------------===// 3331 3332unsigned ASTContext::getIntWidth(QualType T) { 3333 if (T == BoolTy) 3334 return 1; 3335 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3336 return FWIT->getWidth(); 3337 } 3338 // For builtin types, just use the standard type sizing method 3339 return (unsigned)getTypeSize(T); 3340} 3341 3342QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3343 assert(T->isSignedIntegerType() && "Unexpected type"); 3344 if (const EnumType* ETy = T->getAsEnumType()) 3345 T = ETy->getDecl()->getIntegerType(); 3346 const BuiltinType* BTy = T->getAsBuiltinType(); 3347 assert (BTy && "Unexpected signed integer type"); 3348 switch (BTy->getKind()) { 3349 case BuiltinType::Char_S: 3350 case BuiltinType::SChar: 3351 return UnsignedCharTy; 3352 case BuiltinType::Short: 3353 return UnsignedShortTy; 3354 case BuiltinType::Int: 3355 return UnsignedIntTy; 3356 case BuiltinType::Long: 3357 return UnsignedLongTy; 3358 case BuiltinType::LongLong: 3359 return UnsignedLongLongTy; 3360 case BuiltinType::Int128: 3361 return UnsignedInt128Ty; 3362 default: 3363 assert(0 && "Unexpected signed integer type"); 3364 return QualType(); 3365 } 3366} 3367 3368ExternalASTSource::~ExternalASTSource() { } 3369 3370void ExternalASTSource::PrintStats() { } 3371 3372 3373//===----------------------------------------------------------------------===// 3374// Builtin Type Computation 3375//===----------------------------------------------------------------------===// 3376 3377/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3378/// pointer over the consumed characters. This returns the resultant type. 3379static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3380 ASTContext::GetBuiltinTypeError &Error, 3381 bool AllowTypeModifiers = true) { 3382 // Modifiers. 3383 int HowLong = 0; 3384 bool Signed = false, Unsigned = false; 3385 3386 // Read the modifiers first. 3387 bool Done = false; 3388 while (!Done) { 3389 switch (*Str++) { 3390 default: Done = true; --Str; break; 3391 case 'S': 3392 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3393 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3394 Signed = true; 3395 break; 3396 case 'U': 3397 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 3398 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 3399 Unsigned = true; 3400 break; 3401 case 'L': 3402 assert(HowLong <= 2 && "Can't have LLLL modifier"); 3403 ++HowLong; 3404 break; 3405 } 3406 } 3407 3408 QualType Type; 3409 3410 // Read the base type. 3411 switch (*Str++) { 3412 default: assert(0 && "Unknown builtin type letter!"); 3413 case 'v': 3414 assert(HowLong == 0 && !Signed && !Unsigned && 3415 "Bad modifiers used with 'v'!"); 3416 Type = Context.VoidTy; 3417 break; 3418 case 'f': 3419 assert(HowLong == 0 && !Signed && !Unsigned && 3420 "Bad modifiers used with 'f'!"); 3421 Type = Context.FloatTy; 3422 break; 3423 case 'd': 3424 assert(HowLong < 2 && !Signed && !Unsigned && 3425 "Bad modifiers used with 'd'!"); 3426 if (HowLong) 3427 Type = Context.LongDoubleTy; 3428 else 3429 Type = Context.DoubleTy; 3430 break; 3431 case 's': 3432 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 3433 if (Unsigned) 3434 Type = Context.UnsignedShortTy; 3435 else 3436 Type = Context.ShortTy; 3437 break; 3438 case 'i': 3439 if (HowLong == 3) 3440 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 3441 else if (HowLong == 2) 3442 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 3443 else if (HowLong == 1) 3444 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 3445 else 3446 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 3447 break; 3448 case 'c': 3449 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 3450 if (Signed) 3451 Type = Context.SignedCharTy; 3452 else if (Unsigned) 3453 Type = Context.UnsignedCharTy; 3454 else 3455 Type = Context.CharTy; 3456 break; 3457 case 'b': // boolean 3458 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 3459 Type = Context.BoolTy; 3460 break; 3461 case 'z': // size_t. 3462 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 3463 Type = Context.getSizeType(); 3464 break; 3465 case 'F': 3466 Type = Context.getCFConstantStringType(); 3467 break; 3468 case 'a': 3469 Type = Context.getBuiltinVaListType(); 3470 assert(!Type.isNull() && "builtin va list type not initialized!"); 3471 break; 3472 case 'A': 3473 // This is a "reference" to a va_list; however, what exactly 3474 // this means depends on how va_list is defined. There are two 3475 // different kinds of va_list: ones passed by value, and ones 3476 // passed by reference. An example of a by-value va_list is 3477 // x86, where va_list is a char*. An example of by-ref va_list 3478 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 3479 // we want this argument to be a char*&; for x86-64, we want 3480 // it to be a __va_list_tag*. 3481 Type = Context.getBuiltinVaListType(); 3482 assert(!Type.isNull() && "builtin va list type not initialized!"); 3483 if (Type->isArrayType()) { 3484 Type = Context.getArrayDecayedType(Type); 3485 } else { 3486 Type = Context.getLValueReferenceType(Type); 3487 } 3488 break; 3489 case 'V': { 3490 char *End; 3491 3492 unsigned NumElements = strtoul(Str, &End, 10); 3493 assert(End != Str && "Missing vector size"); 3494 3495 Str = End; 3496 3497 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 3498 Type = Context.getVectorType(ElementType, NumElements); 3499 break; 3500 } 3501 case 'P': { 3502 IdentifierInfo *II = &Context.Idents.get("FILE"); 3503 DeclContext::lookup_result Lookup 3504 = Context.getTranslationUnitDecl()->lookup(Context, II); 3505 if (Lookup.first != Lookup.second && isa<TypeDecl>(*Lookup.first)) { 3506 Type = Context.getTypeDeclType(cast<TypeDecl>(*Lookup.first)); 3507 break; 3508 } 3509 else { 3510 Error = ASTContext::GE_Missing_FILE; 3511 return QualType(); 3512 } 3513 } 3514 } 3515 3516 if (!AllowTypeModifiers) 3517 return Type; 3518 3519 Done = false; 3520 while (!Done) { 3521 switch (*Str++) { 3522 default: Done = true; --Str; break; 3523 case '*': 3524 Type = Context.getPointerType(Type); 3525 break; 3526 case '&': 3527 Type = Context.getLValueReferenceType(Type); 3528 break; 3529 // FIXME: There's no way to have a built-in with an rvalue ref arg. 3530 case 'C': 3531 Type = Type.getQualifiedType(QualType::Const); 3532 break; 3533 } 3534 } 3535 3536 return Type; 3537} 3538 3539/// GetBuiltinType - Return the type for the specified builtin. 3540QualType ASTContext::GetBuiltinType(unsigned id, 3541 GetBuiltinTypeError &Error) { 3542 const char *TypeStr = BuiltinInfo.GetTypeString(id); 3543 3544 llvm::SmallVector<QualType, 8> ArgTypes; 3545 3546 Error = GE_None; 3547 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 3548 if (Error != GE_None) 3549 return QualType(); 3550 while (TypeStr[0] && TypeStr[0] != '.') { 3551 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 3552 if (Error != GE_None) 3553 return QualType(); 3554 3555 // Do array -> pointer decay. The builtin should use the decayed type. 3556 if (Ty->isArrayType()) 3557 Ty = getArrayDecayedType(Ty); 3558 3559 ArgTypes.push_back(Ty); 3560 } 3561 3562 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 3563 "'.' should only occur at end of builtin type list!"); 3564 3565 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 3566 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 3567 return getFunctionNoProtoType(ResType); 3568 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 3569 TypeStr[0] == '.', 0); 3570} 3571