ASTContext.cpp revision 395b475a4474f1c7574d927ad142ca0c7997cbca
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>(*this)) 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::ObjCObjectPointer: 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>(*this)) { 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::Decltype: 464 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 465 .getTypePtr()); 466 467 case Type::QualifiedName: 468 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 469 470 case Type::TemplateSpecialization: 471 assert(getCanonicalType(T) != T && 472 "Cannot request the size of a dependent type"); 473 // FIXME: this is likely to be wrong once we support template 474 // aliases, since a template alias could refer to a typedef that 475 // has an __aligned__ attribute on it. 476 return getTypeInfo(getCanonicalType(T)); 477 } 478 479 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 480 return std::make_pair(Width, Align); 481} 482 483/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 484/// type for the current target in bits. This can be different than the ABI 485/// alignment in cases where it is beneficial for performance to overalign 486/// a data type. 487unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 488 unsigned ABIAlign = getTypeAlign(T); 489 490 // Double and long long should be naturally aligned if possible. 491 if (const ComplexType* CT = T->getAsComplexType()) 492 T = CT->getElementType().getTypePtr(); 493 if (T->isSpecificBuiltinType(BuiltinType::Double) || 494 T->isSpecificBuiltinType(BuiltinType::LongLong)) 495 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 496 497 return ABIAlign; 498} 499 500 501/// LayoutField - Field layout. 502void ASTRecordLayout::LayoutField(const FieldDecl *FD, unsigned FieldNo, 503 bool IsUnion, unsigned StructPacking, 504 ASTContext &Context) { 505 unsigned FieldPacking = StructPacking; 506 uint64_t FieldOffset = IsUnion ? 0 : Size; 507 uint64_t FieldSize; 508 unsigned FieldAlign; 509 510 // FIXME: Should this override struct packing? Probably we want to 511 // take the minimum? 512 if (const PackedAttr *PA = FD->getAttr<PackedAttr>(Context)) 513 FieldPacking = PA->getAlignment(); 514 515 if (const Expr *BitWidthExpr = FD->getBitWidth()) { 516 // TODO: Need to check this algorithm on other targets! 517 // (tested on Linux-X86) 518 FieldSize = BitWidthExpr->EvaluateAsInt(Context).getZExtValue(); 519 520 std::pair<uint64_t, unsigned> FieldInfo = 521 Context.getTypeInfo(FD->getType()); 522 uint64_t TypeSize = FieldInfo.first; 523 524 // Determine the alignment of this bitfield. The packing 525 // attributes define a maximum and the alignment attribute defines 526 // a minimum. 527 // FIXME: What is the right behavior when the specified alignment 528 // is smaller than the specified packing? 529 FieldAlign = FieldInfo.second; 530 if (FieldPacking) 531 FieldAlign = std::min(FieldAlign, FieldPacking); 532 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>(Context)) 533 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 534 535 // Check if we need to add padding to give the field the correct 536 // alignment. 537 if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize) 538 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 539 540 // Padding members don't affect overall alignment 541 if (!FD->getIdentifier()) 542 FieldAlign = 1; 543 } else { 544 if (FD->getType()->isIncompleteArrayType()) { 545 // This is a flexible array member; we can't directly 546 // query getTypeInfo about these, so we figure it out here. 547 // Flexible array members don't have any size, but they 548 // have to be aligned appropriately for their element type. 549 FieldSize = 0; 550 const ArrayType* ATy = Context.getAsArrayType(FD->getType()); 551 FieldAlign = Context.getTypeAlign(ATy->getElementType()); 552 } else if (const ReferenceType *RT = FD->getType()->getAsReferenceType()) { 553 unsigned AS = RT->getPointeeType().getAddressSpace(); 554 FieldSize = Context.Target.getPointerWidth(AS); 555 FieldAlign = Context.Target.getPointerAlign(AS); 556 } else { 557 std::pair<uint64_t, unsigned> FieldInfo = 558 Context.getTypeInfo(FD->getType()); 559 FieldSize = FieldInfo.first; 560 FieldAlign = FieldInfo.second; 561 } 562 563 // Determine the alignment of this bitfield. The packing 564 // attributes define a maximum and the alignment attribute defines 565 // a minimum. Additionally, the packing alignment must be at least 566 // a byte for non-bitfields. 567 // 568 // FIXME: What is the right behavior when the specified alignment 569 // is smaller than the specified packing? 570 if (FieldPacking) 571 FieldAlign = std::min(FieldAlign, std::max(8U, FieldPacking)); 572 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>(Context)) 573 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 574 575 // Round up the current record size to the field's alignment boundary. 576 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 577 } 578 579 // Place this field at the current location. 580 FieldOffsets[FieldNo] = FieldOffset; 581 582 // Reserve space for this field. 583 if (IsUnion) { 584 Size = std::max(Size, FieldSize); 585 } else { 586 Size = FieldOffset + FieldSize; 587 } 588 589 // Remember the next available offset. 590 NextOffset = Size; 591 592 // Remember max struct/class alignment. 593 Alignment = std::max(Alignment, FieldAlign); 594} 595 596static void CollectLocalObjCIvars(ASTContext *Ctx, 597 const ObjCInterfaceDecl *OI, 598 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 599 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 600 E = OI->ivar_end(); I != E; ++I) { 601 ObjCIvarDecl *IVDecl = *I; 602 if (!IVDecl->isInvalidDecl()) 603 Fields.push_back(cast<FieldDecl>(IVDecl)); 604 } 605} 606 607void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 608 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 609 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 610 CollectObjCIvars(SuperClass, Fields); 611 CollectLocalObjCIvars(this, OI, Fields); 612} 613 614/// ShallowCollectObjCIvars - 615/// Collect all ivars, including those synthesized, in the current class. 616/// 617void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 618 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 619 bool CollectSynthesized) { 620 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 621 E = OI->ivar_end(); I != E; ++I) { 622 Ivars.push_back(*I); 623 } 624 if (CollectSynthesized) 625 CollectSynthesizedIvars(OI, Ivars); 626} 627 628void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 629 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 630 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(*this), 631 E = PD->prop_end(*this); I != E; ++I) 632 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 633 Ivars.push_back(Ivar); 634 635 // Also look into nested protocols. 636 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 637 E = PD->protocol_end(); P != E; ++P) 638 CollectProtocolSynthesizedIvars(*P, Ivars); 639} 640 641/// CollectSynthesizedIvars - 642/// This routine collect synthesized ivars for the designated class. 643/// 644void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 645 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 646 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(*this), 647 E = OI->prop_end(*this); I != E; ++I) { 648 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 649 Ivars.push_back(Ivar); 650 } 651 // Also look into interface's protocol list for properties declared 652 // in the protocol and whose ivars are synthesized. 653 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 654 PE = OI->protocol_end(); P != PE; ++P) { 655 ObjCProtocolDecl *PD = (*P); 656 CollectProtocolSynthesizedIvars(PD, Ivars); 657 } 658} 659 660unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 661 unsigned count = 0; 662 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(*this), 663 E = PD->prop_end(*this); I != E; ++I) 664 if ((*I)->getPropertyIvarDecl()) 665 ++count; 666 667 // Also look into nested protocols. 668 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 669 E = PD->protocol_end(); P != E; ++P) 670 count += CountProtocolSynthesizedIvars(*P); 671 return count; 672} 673 674unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) 675{ 676 unsigned count = 0; 677 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(*this), 678 E = OI->prop_end(*this); I != E; ++I) { 679 if ((*I)->getPropertyIvarDecl()) 680 ++count; 681 } 682 // Also look into interface's protocol list for properties declared 683 // in the protocol and whose ivars are synthesized. 684 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 685 PE = OI->protocol_end(); P != PE; ++P) { 686 ObjCProtocolDecl *PD = (*P); 687 count += CountProtocolSynthesizedIvars(PD); 688 } 689 return count; 690} 691 692/// getInterfaceLayoutImpl - Get or compute information about the 693/// layout of the given interface. 694/// 695/// \param Impl - If given, also include the layout of the interface's 696/// implementation. This may differ by including synthesized ivars. 697const ASTRecordLayout & 698ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 699 const ObjCImplementationDecl *Impl) { 700 assert(!D->isForwardDecl() && "Invalid interface decl!"); 701 702 // Look up this layout, if already laid out, return what we have. 703 ObjCContainerDecl *Key = 704 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 705 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 706 return *Entry; 707 708 unsigned FieldCount = D->ivar_size(); 709 // Add in synthesized ivar count if laying out an implementation. 710 if (Impl) { 711 unsigned SynthCount = CountSynthesizedIvars(D); 712 FieldCount += SynthCount; 713 // If there aren't any sythesized ivars then reuse the interface 714 // entry. Note we can't cache this because we simply free all 715 // entries later; however we shouldn't look up implementations 716 // frequently. 717 if (SynthCount == 0) 718 return getObjCLayout(D, 0); 719 } 720 721 ASTRecordLayout *NewEntry = NULL; 722 if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 723 const ASTRecordLayout &SL = getASTObjCInterfaceLayout(SD); 724 unsigned Alignment = SL.getAlignment(); 725 726 // We start laying out ivars not at the end of the superclass 727 // structure, but at the next byte following the last field. 728 uint64_t Size = llvm::RoundUpToAlignment(SL.NextOffset, 8); 729 730 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(Size, Alignment); 731 NewEntry->InitializeLayout(FieldCount); 732 } else { 733 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(); 734 NewEntry->InitializeLayout(FieldCount); 735 } 736 737 unsigned StructPacking = 0; 738 if (const PackedAttr *PA = D->getAttr<PackedAttr>(*this)) 739 StructPacking = PA->getAlignment(); 740 741 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>(*this)) 742 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 743 AA->getAlignment())); 744 745 // Layout each ivar sequentially. 746 unsigned i = 0; 747 llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; 748 ShallowCollectObjCIvars(D, Ivars, Impl); 749 for (unsigned k = 0, e = Ivars.size(); k != e; ++k) 750 NewEntry->LayoutField(Ivars[k], i++, false, StructPacking, *this); 751 752 // Finally, round the size of the total struct up to the alignment of the 753 // struct itself. 754 NewEntry->FinalizeLayout(); 755 return *NewEntry; 756} 757 758const ASTRecordLayout & 759ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 760 return getObjCLayout(D, 0); 761} 762 763const ASTRecordLayout & 764ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 765 return getObjCLayout(D->getClassInterface(), D); 766} 767 768/// getASTRecordLayout - Get or compute information about the layout of the 769/// specified record (struct/union/class), which indicates its size and field 770/// position information. 771const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 772 D = D->getDefinition(*this); 773 assert(D && "Cannot get layout of forward declarations!"); 774 775 // Look up this layout, if already laid out, return what we have. 776 const ASTRecordLayout *&Entry = ASTRecordLayouts[D]; 777 if (Entry) return *Entry; 778 779 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 780 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 781 ASTRecordLayout *NewEntry = new ASTRecordLayout(); 782 Entry = NewEntry; 783 784 // FIXME: Avoid linear walk through the fields, if possible. 785 NewEntry->InitializeLayout(std::distance(D->field_begin(*this), 786 D->field_end(*this))); 787 bool IsUnion = D->isUnion(); 788 789 unsigned StructPacking = 0; 790 if (const PackedAttr *PA = D->getAttr<PackedAttr>(*this)) 791 StructPacking = PA->getAlignment(); 792 793 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>(*this)) 794 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 795 AA->getAlignment())); 796 797 // Layout each field, for now, just sequentially, respecting alignment. In 798 // the future, this will need to be tweakable by targets. 799 unsigned FieldIdx = 0; 800 for (RecordDecl::field_iterator Field = D->field_begin(*this), 801 FieldEnd = D->field_end(*this); 802 Field != FieldEnd; (void)++Field, ++FieldIdx) 803 NewEntry->LayoutField(*Field, FieldIdx, IsUnion, StructPacking, *this); 804 805 // Finally, round the size of the total struct up to the alignment of the 806 // struct itself. 807 NewEntry->FinalizeLayout(getLangOptions().CPlusPlus); 808 return *NewEntry; 809} 810 811//===----------------------------------------------------------------------===// 812// Type creation/memoization methods 813//===----------------------------------------------------------------------===// 814 815QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 816 QualType CanT = getCanonicalType(T); 817 if (CanT.getAddressSpace() == AddressSpace) 818 return T; 819 820 // If we are composing extended qualifiers together, merge together into one 821 // ExtQualType node. 822 unsigned CVRQuals = T.getCVRQualifiers(); 823 QualType::GCAttrTypes GCAttr = QualType::GCNone; 824 Type *TypeNode = T.getTypePtr(); 825 826 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 827 // If this type already has an address space specified, it cannot get 828 // another one. 829 assert(EQT->getAddressSpace() == 0 && 830 "Type cannot be in multiple addr spaces!"); 831 GCAttr = EQT->getObjCGCAttr(); 832 TypeNode = EQT->getBaseType(); 833 } 834 835 // Check if we've already instantiated this type. 836 llvm::FoldingSetNodeID ID; 837 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 838 void *InsertPos = 0; 839 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 840 return QualType(EXTQy, CVRQuals); 841 842 // If the base type isn't canonical, this won't be a canonical type either, 843 // so fill in the canonical type field. 844 QualType Canonical; 845 if (!TypeNode->isCanonical()) { 846 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 847 848 // Update InsertPos, the previous call could have invalidated it. 849 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 850 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 851 } 852 ExtQualType *New = 853 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 854 ExtQualTypes.InsertNode(New, InsertPos); 855 Types.push_back(New); 856 return QualType(New, CVRQuals); 857} 858 859QualType ASTContext::getObjCGCQualType(QualType T, 860 QualType::GCAttrTypes GCAttr) { 861 QualType CanT = getCanonicalType(T); 862 if (CanT.getObjCGCAttr() == GCAttr) 863 return T; 864 865 if (T->isPointerType()) { 866 QualType Pointee = T->getAsPointerType()->getPointeeType(); 867 if (Pointee->isPointerType()) { 868 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 869 return getPointerType(ResultType); 870 } 871 } 872 // If we are composing extended qualifiers together, merge together into one 873 // ExtQualType node. 874 unsigned CVRQuals = T.getCVRQualifiers(); 875 Type *TypeNode = T.getTypePtr(); 876 unsigned AddressSpace = 0; 877 878 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 879 // If this type already has an address space specified, it cannot get 880 // another one. 881 assert(EQT->getObjCGCAttr() == QualType::GCNone && 882 "Type cannot be in multiple addr spaces!"); 883 AddressSpace = EQT->getAddressSpace(); 884 TypeNode = EQT->getBaseType(); 885 } 886 887 // Check if we've already instantiated an gc qual'd type of this type. 888 llvm::FoldingSetNodeID ID; 889 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 890 void *InsertPos = 0; 891 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 892 return QualType(EXTQy, CVRQuals); 893 894 // If the base type isn't canonical, this won't be a canonical type either, 895 // so fill in the canonical type field. 896 // FIXME: Isn't this also not canonical if the base type is a array 897 // or pointer type? I can't find any documentation for objc_gc, though... 898 QualType Canonical; 899 if (!T->isCanonical()) { 900 Canonical = getObjCGCQualType(CanT, GCAttr); 901 902 // Update InsertPos, the previous call could have invalidated it. 903 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 904 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 905 } 906 ExtQualType *New = 907 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 908 ExtQualTypes.InsertNode(New, InsertPos); 909 Types.push_back(New); 910 return QualType(New, CVRQuals); 911} 912 913/// getComplexType - Return the uniqued reference to the type for a complex 914/// number with the specified element type. 915QualType ASTContext::getComplexType(QualType T) { 916 // Unique pointers, to guarantee there is only one pointer of a particular 917 // structure. 918 llvm::FoldingSetNodeID ID; 919 ComplexType::Profile(ID, T); 920 921 void *InsertPos = 0; 922 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 923 return QualType(CT, 0); 924 925 // If the pointee type isn't canonical, this won't be a canonical type either, 926 // so fill in the canonical type field. 927 QualType Canonical; 928 if (!T->isCanonical()) { 929 Canonical = getComplexType(getCanonicalType(T)); 930 931 // Get the new insert position for the node we care about. 932 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 933 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 934 } 935 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 936 Types.push_back(New); 937 ComplexTypes.InsertNode(New, InsertPos); 938 return QualType(New, 0); 939} 940 941QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 942 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 943 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 944 FixedWidthIntType *&Entry = Map[Width]; 945 if (!Entry) 946 Entry = new FixedWidthIntType(Width, Signed); 947 return QualType(Entry, 0); 948} 949 950/// getPointerType - Return the uniqued reference to the type for a pointer to 951/// the specified type. 952QualType ASTContext::getPointerType(QualType T) { 953 // Unique pointers, to guarantee there is only one pointer of a particular 954 // structure. 955 llvm::FoldingSetNodeID ID; 956 PointerType::Profile(ID, T); 957 958 void *InsertPos = 0; 959 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 960 return QualType(PT, 0); 961 962 // If the pointee type isn't canonical, this won't be a canonical type either, 963 // so fill in the canonical type field. 964 QualType Canonical; 965 if (!T->isCanonical()) { 966 Canonical = getPointerType(getCanonicalType(T)); 967 968 // Get the new insert position for the node we care about. 969 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 970 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 971 } 972 PointerType *New = new (*this,8) PointerType(T, Canonical); 973 Types.push_back(New); 974 PointerTypes.InsertNode(New, InsertPos); 975 return QualType(New, 0); 976} 977 978/// getBlockPointerType - Return the uniqued reference to the type for 979/// a pointer to the specified block. 980QualType ASTContext::getBlockPointerType(QualType T) { 981 assert(T->isFunctionType() && "block of function types only"); 982 // Unique pointers, to guarantee there is only one block of a particular 983 // structure. 984 llvm::FoldingSetNodeID ID; 985 BlockPointerType::Profile(ID, T); 986 987 void *InsertPos = 0; 988 if (BlockPointerType *PT = 989 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 990 return QualType(PT, 0); 991 992 // If the block pointee type isn't canonical, this won't be a canonical 993 // type either so fill in the canonical type field. 994 QualType Canonical; 995 if (!T->isCanonical()) { 996 Canonical = getBlockPointerType(getCanonicalType(T)); 997 998 // Get the new insert position for the node we care about. 999 BlockPointerType *NewIP = 1000 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1001 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1002 } 1003 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 1004 Types.push_back(New); 1005 BlockPointerTypes.InsertNode(New, InsertPos); 1006 return QualType(New, 0); 1007} 1008 1009/// getLValueReferenceType - Return the uniqued reference to the type for an 1010/// lvalue reference to the specified type. 1011QualType ASTContext::getLValueReferenceType(QualType T) { 1012 // Unique pointers, to guarantee there is only one pointer of a particular 1013 // structure. 1014 llvm::FoldingSetNodeID ID; 1015 ReferenceType::Profile(ID, T); 1016 1017 void *InsertPos = 0; 1018 if (LValueReferenceType *RT = 1019 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1020 return QualType(RT, 0); 1021 1022 // If the referencee type isn't canonical, this won't be a canonical type 1023 // either, so fill in the canonical type field. 1024 QualType Canonical; 1025 if (!T->isCanonical()) { 1026 Canonical = getLValueReferenceType(getCanonicalType(T)); 1027 1028 // Get the new insert position for the node we care about. 1029 LValueReferenceType *NewIP = 1030 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1031 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1032 } 1033 1034 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 1035 Types.push_back(New); 1036 LValueReferenceTypes.InsertNode(New, InsertPos); 1037 return QualType(New, 0); 1038} 1039 1040/// getRValueReferenceType - Return the uniqued reference to the type for an 1041/// rvalue reference to the specified type. 1042QualType ASTContext::getRValueReferenceType(QualType T) { 1043 // Unique pointers, to guarantee there is only one pointer of a particular 1044 // structure. 1045 llvm::FoldingSetNodeID ID; 1046 ReferenceType::Profile(ID, T); 1047 1048 void *InsertPos = 0; 1049 if (RValueReferenceType *RT = 1050 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1051 return QualType(RT, 0); 1052 1053 // If the referencee type isn't canonical, this won't be a canonical type 1054 // either, so fill in the canonical type field. 1055 QualType Canonical; 1056 if (!T->isCanonical()) { 1057 Canonical = getRValueReferenceType(getCanonicalType(T)); 1058 1059 // Get the new insert position for the node we care about. 1060 RValueReferenceType *NewIP = 1061 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1062 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1063 } 1064 1065 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 1066 Types.push_back(New); 1067 RValueReferenceTypes.InsertNode(New, InsertPos); 1068 return QualType(New, 0); 1069} 1070 1071/// getMemberPointerType - Return the uniqued reference to the type for a 1072/// member pointer to the specified type, in the specified class. 1073QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1074{ 1075 // Unique pointers, to guarantee there is only one pointer of a particular 1076 // structure. 1077 llvm::FoldingSetNodeID ID; 1078 MemberPointerType::Profile(ID, T, Cls); 1079 1080 void *InsertPos = 0; 1081 if (MemberPointerType *PT = 1082 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1083 return QualType(PT, 0); 1084 1085 // If the pointee or class type isn't canonical, this won't be a canonical 1086 // type either, so fill in the canonical type field. 1087 QualType Canonical; 1088 if (!T->isCanonical()) { 1089 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1090 1091 // Get the new insert position for the node we care about. 1092 MemberPointerType *NewIP = 1093 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1094 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1095 } 1096 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1097 Types.push_back(New); 1098 MemberPointerTypes.InsertNode(New, InsertPos); 1099 return QualType(New, 0); 1100} 1101 1102/// getConstantArrayType - Return the unique reference to the type for an 1103/// array of the specified element type. 1104QualType ASTContext::getConstantArrayType(QualType EltTy, 1105 const llvm::APInt &ArySizeIn, 1106 ArrayType::ArraySizeModifier ASM, 1107 unsigned EltTypeQuals) { 1108 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1109 "Constant array of VLAs is illegal!"); 1110 1111 // Convert the array size into a canonical width matching the pointer size for 1112 // the target. 1113 llvm::APInt ArySize(ArySizeIn); 1114 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1115 1116 llvm::FoldingSetNodeID ID; 1117 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1118 1119 void *InsertPos = 0; 1120 if (ConstantArrayType *ATP = 1121 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1122 return QualType(ATP, 0); 1123 1124 // If the element type isn't canonical, this won't be a canonical type either, 1125 // so fill in the canonical type field. 1126 QualType Canonical; 1127 if (!EltTy->isCanonical()) { 1128 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1129 ASM, EltTypeQuals); 1130 // Get the new insert position for the node we care about. 1131 ConstantArrayType *NewIP = 1132 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1133 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1134 } 1135 1136 ConstantArrayType *New = 1137 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1138 ConstantArrayTypes.InsertNode(New, InsertPos); 1139 Types.push_back(New); 1140 return QualType(New, 0); 1141} 1142 1143/// getVariableArrayType - Returns a non-unique reference to the type for a 1144/// variable array of the specified element type. 1145QualType ASTContext::getVariableArrayType(QualType EltTy, Expr *NumElts, 1146 ArrayType::ArraySizeModifier ASM, 1147 unsigned EltTypeQuals) { 1148 // Since we don't unique expressions, it isn't possible to unique VLA's 1149 // that have an expression provided for their size. 1150 1151 VariableArrayType *New = 1152 new(*this,8)VariableArrayType(EltTy,QualType(), NumElts, ASM, EltTypeQuals); 1153 1154 VariableArrayTypes.push_back(New); 1155 Types.push_back(New); 1156 return QualType(New, 0); 1157} 1158 1159/// getDependentSizedArrayType - Returns a non-unique reference to 1160/// the type for a dependently-sized array of the specified element 1161/// type. FIXME: We will need these to be uniqued, or at least 1162/// comparable, at some point. 1163QualType ASTContext::getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 1164 ArrayType::ArraySizeModifier ASM, 1165 unsigned EltTypeQuals) { 1166 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1167 "Size must be type- or value-dependent!"); 1168 1169 // Since we don't unique expressions, it isn't possible to unique 1170 // dependently-sized array types. 1171 1172 DependentSizedArrayType *New = 1173 new (*this,8) DependentSizedArrayType(EltTy, QualType(), NumElts, 1174 ASM, EltTypeQuals); 1175 1176 DependentSizedArrayTypes.push_back(New); 1177 Types.push_back(New); 1178 return QualType(New, 0); 1179} 1180 1181QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1182 ArrayType::ArraySizeModifier ASM, 1183 unsigned EltTypeQuals) { 1184 llvm::FoldingSetNodeID ID; 1185 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1186 1187 void *InsertPos = 0; 1188 if (IncompleteArrayType *ATP = 1189 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1190 return QualType(ATP, 0); 1191 1192 // If the element type isn't canonical, this won't be a canonical type 1193 // either, so fill in the canonical type field. 1194 QualType Canonical; 1195 1196 if (!EltTy->isCanonical()) { 1197 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1198 ASM, EltTypeQuals); 1199 1200 // Get the new insert position for the node we care about. 1201 IncompleteArrayType *NewIP = 1202 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1203 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1204 } 1205 1206 IncompleteArrayType *New = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1207 ASM, EltTypeQuals); 1208 1209 IncompleteArrayTypes.InsertNode(New, InsertPos); 1210 Types.push_back(New); 1211 return QualType(New, 0); 1212} 1213 1214/// getVectorType - Return the unique reference to a vector type of 1215/// the specified element type and size. VectorType must be a built-in type. 1216QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1217 BuiltinType *baseType; 1218 1219 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1220 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1221 1222 // Check if we've already instantiated a vector of this type. 1223 llvm::FoldingSetNodeID ID; 1224 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1225 void *InsertPos = 0; 1226 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1227 return QualType(VTP, 0); 1228 1229 // If the element type isn't canonical, this won't be a canonical type either, 1230 // so fill in the canonical type field. 1231 QualType Canonical; 1232 if (!vecType->isCanonical()) { 1233 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1234 1235 // Get the new insert position for the node we care about. 1236 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1237 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1238 } 1239 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1240 VectorTypes.InsertNode(New, InsertPos); 1241 Types.push_back(New); 1242 return QualType(New, 0); 1243} 1244 1245/// getExtVectorType - Return the unique reference to an extended vector type of 1246/// the specified element type and size. VectorType must be a built-in type. 1247QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1248 BuiltinType *baseType; 1249 1250 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1251 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1252 1253 // Check if we've already instantiated a vector of this type. 1254 llvm::FoldingSetNodeID ID; 1255 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1256 void *InsertPos = 0; 1257 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1258 return QualType(VTP, 0); 1259 1260 // If the element type isn't canonical, this won't be a canonical type either, 1261 // so fill in the canonical type field. 1262 QualType Canonical; 1263 if (!vecType->isCanonical()) { 1264 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1265 1266 // Get the new insert position for the node we care about. 1267 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1268 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1269 } 1270 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1271 VectorTypes.InsertNode(New, InsertPos); 1272 Types.push_back(New); 1273 return QualType(New, 0); 1274} 1275 1276QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1277 Expr *SizeExpr, 1278 SourceLocation AttrLoc) { 1279 DependentSizedExtVectorType *New = 1280 new (*this,8) DependentSizedExtVectorType(vecType, QualType(), 1281 SizeExpr, AttrLoc); 1282 1283 DependentSizedExtVectorTypes.push_back(New); 1284 Types.push_back(New); 1285 return QualType(New, 0); 1286} 1287 1288/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1289/// 1290QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) { 1291 // Unique functions, to guarantee there is only one function of a particular 1292 // structure. 1293 llvm::FoldingSetNodeID ID; 1294 FunctionNoProtoType::Profile(ID, ResultTy); 1295 1296 void *InsertPos = 0; 1297 if (FunctionNoProtoType *FT = 1298 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1299 return QualType(FT, 0); 1300 1301 QualType Canonical; 1302 if (!ResultTy->isCanonical()) { 1303 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy)); 1304 1305 // Get the new insert position for the node we care about. 1306 FunctionNoProtoType *NewIP = 1307 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1308 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1309 } 1310 1311 FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical); 1312 Types.push_back(New); 1313 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1314 return QualType(New, 0); 1315} 1316 1317/// getFunctionType - Return a normal function type with a typed argument 1318/// list. isVariadic indicates whether the argument list includes '...'. 1319QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1320 unsigned NumArgs, bool isVariadic, 1321 unsigned TypeQuals, bool hasExceptionSpec, 1322 bool hasAnyExceptionSpec, unsigned NumExs, 1323 const QualType *ExArray) { 1324 // Unique functions, to guarantee there is only one function of a particular 1325 // structure. 1326 llvm::FoldingSetNodeID ID; 1327 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1328 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1329 NumExs, ExArray); 1330 1331 void *InsertPos = 0; 1332 if (FunctionProtoType *FTP = 1333 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1334 return QualType(FTP, 0); 1335 1336 // Determine whether the type being created is already canonical or not. 1337 bool isCanonical = ResultTy->isCanonical(); 1338 if (hasExceptionSpec) 1339 isCanonical = false; 1340 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1341 if (!ArgArray[i]->isCanonical()) 1342 isCanonical = false; 1343 1344 // If this type isn't canonical, get the canonical version of it. 1345 // The exception spec is not part of the canonical type. 1346 QualType Canonical; 1347 if (!isCanonical) { 1348 llvm::SmallVector<QualType, 16> CanonicalArgs; 1349 CanonicalArgs.reserve(NumArgs); 1350 for (unsigned i = 0; i != NumArgs; ++i) 1351 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1352 1353 Canonical = getFunctionType(getCanonicalType(ResultTy), 1354 CanonicalArgs.data(), NumArgs, 1355 isVariadic, TypeQuals); 1356 1357 // Get the new insert position for the node we care about. 1358 FunctionProtoType *NewIP = 1359 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1360 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1361 } 1362 1363 // FunctionProtoType objects are allocated with extra bytes after them 1364 // for two variable size arrays (for parameter and exception types) at the 1365 // end of them. 1366 FunctionProtoType *FTP = 1367 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1368 NumArgs*sizeof(QualType) + 1369 NumExs*sizeof(QualType), 8); 1370 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1371 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1372 ExArray, NumExs, Canonical); 1373 Types.push_back(FTP); 1374 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1375 return QualType(FTP, 0); 1376} 1377 1378/// getTypeDeclType - Return the unique reference to the type for the 1379/// specified type declaration. 1380QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1381 assert(Decl && "Passed null for Decl param"); 1382 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1383 1384 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1385 return getTypedefType(Typedef); 1386 else if (isa<TemplateTypeParmDecl>(Decl)) { 1387 assert(false && "Template type parameter types are always available."); 1388 } else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1389 return getObjCInterfaceType(ObjCInterface); 1390 1391 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1392 if (PrevDecl) 1393 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1394 else 1395 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1396 } 1397 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1398 if (PrevDecl) 1399 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1400 else 1401 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1402 } 1403 else 1404 assert(false && "TypeDecl without a type?"); 1405 1406 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1407 return QualType(Decl->TypeForDecl, 0); 1408} 1409 1410/// getTypedefType - Return the unique reference to the type for the 1411/// specified typename decl. 1412QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1413 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1414 1415 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1416 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1417 Types.push_back(Decl->TypeForDecl); 1418 return QualType(Decl->TypeForDecl, 0); 1419} 1420 1421/// getObjCInterfaceType - Return the unique reference to the type for the 1422/// specified ObjC interface decl. 1423QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) { 1424 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1425 1426 ObjCInterfaceDecl *OID = const_cast<ObjCInterfaceDecl*>(Decl); 1427 Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, OID); 1428 Types.push_back(Decl->TypeForDecl); 1429 return QualType(Decl->TypeForDecl, 0); 1430} 1431 1432/// \brief Retrieve the template type parameter type for a template 1433/// parameter or parameter pack with the given depth, index, and (optionally) 1434/// name. 1435QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1436 bool ParameterPack, 1437 IdentifierInfo *Name) { 1438 llvm::FoldingSetNodeID ID; 1439 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1440 void *InsertPos = 0; 1441 TemplateTypeParmType *TypeParm 1442 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1443 1444 if (TypeParm) 1445 return QualType(TypeParm, 0); 1446 1447 if (Name) { 1448 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1449 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack, 1450 Name, Canon); 1451 } else 1452 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack); 1453 1454 Types.push_back(TypeParm); 1455 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1456 1457 return QualType(TypeParm, 0); 1458} 1459 1460QualType 1461ASTContext::getTemplateSpecializationType(TemplateName Template, 1462 const TemplateArgument *Args, 1463 unsigned NumArgs, 1464 QualType Canon) { 1465 if (!Canon.isNull()) 1466 Canon = getCanonicalType(Canon); 1467 1468 llvm::FoldingSetNodeID ID; 1469 TemplateSpecializationType::Profile(ID, Template, Args, NumArgs); 1470 1471 void *InsertPos = 0; 1472 TemplateSpecializationType *Spec 1473 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1474 1475 if (Spec) 1476 return QualType(Spec, 0); 1477 1478 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1479 sizeof(TemplateArgument) * NumArgs), 1480 8); 1481 Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon); 1482 Types.push_back(Spec); 1483 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1484 1485 return QualType(Spec, 0); 1486} 1487 1488QualType 1489ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1490 QualType NamedType) { 1491 llvm::FoldingSetNodeID ID; 1492 QualifiedNameType::Profile(ID, NNS, NamedType); 1493 1494 void *InsertPos = 0; 1495 QualifiedNameType *T 1496 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1497 if (T) 1498 return QualType(T, 0); 1499 1500 T = new (*this) QualifiedNameType(NNS, NamedType, 1501 getCanonicalType(NamedType)); 1502 Types.push_back(T); 1503 QualifiedNameTypes.InsertNode(T, InsertPos); 1504 return QualType(T, 0); 1505} 1506 1507QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1508 const IdentifierInfo *Name, 1509 QualType Canon) { 1510 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1511 1512 if (Canon.isNull()) { 1513 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1514 if (CanonNNS != NNS) 1515 Canon = getTypenameType(CanonNNS, Name); 1516 } 1517 1518 llvm::FoldingSetNodeID ID; 1519 TypenameType::Profile(ID, NNS, Name); 1520 1521 void *InsertPos = 0; 1522 TypenameType *T 1523 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1524 if (T) 1525 return QualType(T, 0); 1526 1527 T = new (*this) TypenameType(NNS, Name, Canon); 1528 Types.push_back(T); 1529 TypenameTypes.InsertNode(T, InsertPos); 1530 return QualType(T, 0); 1531} 1532 1533QualType 1534ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1535 const TemplateSpecializationType *TemplateId, 1536 QualType Canon) { 1537 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1538 1539 if (Canon.isNull()) { 1540 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1541 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1542 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1543 const TemplateSpecializationType *CanonTemplateId 1544 = CanonType->getAsTemplateSpecializationType(); 1545 assert(CanonTemplateId && 1546 "Canonical type must also be a template specialization type"); 1547 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1548 } 1549 } 1550 1551 llvm::FoldingSetNodeID ID; 1552 TypenameType::Profile(ID, NNS, TemplateId); 1553 1554 void *InsertPos = 0; 1555 TypenameType *T 1556 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1557 if (T) 1558 return QualType(T, 0); 1559 1560 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1561 Types.push_back(T); 1562 TypenameTypes.InsertNode(T, InsertPos); 1563 return QualType(T, 0); 1564} 1565 1566/// CmpProtocolNames - Comparison predicate for sorting protocols 1567/// alphabetically. 1568static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1569 const ObjCProtocolDecl *RHS) { 1570 return LHS->getDeclName() < RHS->getDeclName(); 1571} 1572 1573static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1574 unsigned &NumProtocols) { 1575 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1576 1577 // Sort protocols, keyed by name. 1578 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1579 1580 // Remove duplicates. 1581 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1582 NumProtocols = ProtocolsEnd-Protocols; 1583} 1584 1585/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1586/// the given interface decl and the conforming protocol list. 1587QualType ASTContext::getObjCObjectPointerType(ObjCInterfaceDecl *Decl, 1588 ObjCProtocolDecl **Protocols, 1589 unsigned NumProtocols) { 1590 // Sort the protocol list alphabetically to canonicalize it. 1591 if (NumProtocols) 1592 SortAndUniqueProtocols(Protocols, NumProtocols); 1593 1594 llvm::FoldingSetNodeID ID; 1595 ObjCObjectPointerType::Profile(ID, Decl, Protocols, NumProtocols); 1596 1597 void *InsertPos = 0; 1598 if (ObjCObjectPointerType *QT = 1599 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1600 return QualType(QT, 0); 1601 1602 // No Match; 1603 ObjCObjectPointerType *QType = 1604 new (*this,8) ObjCObjectPointerType(Decl, Protocols, NumProtocols); 1605 1606 Types.push_back(QType); 1607 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1608 return QualType(QType, 0); 1609} 1610 1611/// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for 1612/// the given interface decl and the conforming protocol list. 1613QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 1614 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1615 // Sort the protocol list alphabetically to canonicalize it. 1616 SortAndUniqueProtocols(Protocols, NumProtocols); 1617 1618 llvm::FoldingSetNodeID ID; 1619 ObjCQualifiedInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1620 1621 void *InsertPos = 0; 1622 if (ObjCQualifiedInterfaceType *QT = 1623 ObjCQualifiedInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1624 return QualType(QT, 0); 1625 1626 // No Match; 1627 ObjCQualifiedInterfaceType *QType = 1628 new (*this,8) ObjCQualifiedInterfaceType(Decl, Protocols, NumProtocols); 1629 1630 Types.push_back(QType); 1631 ObjCQualifiedInterfaceTypes.InsertNode(QType, InsertPos); 1632 return QualType(QType, 0); 1633} 1634 1635/// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for the 'id' decl 1636/// and the conforming protocol list. 1637QualType ASTContext::getObjCQualifiedIdType(ObjCProtocolDecl **Protocols, 1638 unsigned NumProtocols) { 1639 return getObjCObjectPointerType(0, Protocols, NumProtocols); 1640} 1641 1642/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1643/// TypeOfExprType AST's (since expression's are never shared). For example, 1644/// multiple declarations that refer to "typeof(x)" all contain different 1645/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1646/// on canonical type's (which are always unique). 1647QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1648 QualType Canonical = getCanonicalType(tofExpr->getType()); 1649 TypeOfExprType *toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1650 Types.push_back(toe); 1651 return QualType(toe, 0); 1652} 1653 1654/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1655/// TypeOfType AST's. The only motivation to unique these nodes would be 1656/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1657/// an issue. This doesn't effect the type checker, since it operates 1658/// on canonical type's (which are always unique). 1659QualType ASTContext::getTypeOfType(QualType tofType) { 1660 QualType Canonical = getCanonicalType(tofType); 1661 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1662 Types.push_back(tot); 1663 return QualType(tot, 0); 1664} 1665 1666/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 1667/// DecltypeType AST's. The only motivation to unique these nodes would be 1668/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 1669/// an issue. This doesn't effect the type checker, since it operates 1670/// on canonical type's (which are always unique). 1671QualType ASTContext::getDecltypeType(Expr *e) { 1672 // FIXME: Use the right type here! 1673 QualType Canonical = getCanonicalType(e->getType()); 1674 DecltypeType *dt = new (*this, 8) DecltypeType(e, Canonical); 1675 Types.push_back(dt); 1676 return QualType(dt, 0); 1677} 1678 1679/// getTagDeclType - Return the unique reference to the type for the 1680/// specified TagDecl (struct/union/class/enum) decl. 1681QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1682 assert (Decl); 1683 return getTypeDeclType(Decl); 1684} 1685 1686/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1687/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1688/// needs to agree with the definition in <stddef.h>. 1689QualType ASTContext::getSizeType() const { 1690 return getFromTargetType(Target.getSizeType()); 1691} 1692 1693/// getSignedWCharType - Return the type of "signed wchar_t". 1694/// Used when in C++, as a GCC extension. 1695QualType ASTContext::getSignedWCharType() const { 1696 // FIXME: derive from "Target" ? 1697 return WCharTy; 1698} 1699 1700/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1701/// Used when in C++, as a GCC extension. 1702QualType ASTContext::getUnsignedWCharType() const { 1703 // FIXME: derive from "Target" ? 1704 return UnsignedIntTy; 1705} 1706 1707/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 1708/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 1709QualType ASTContext::getPointerDiffType() const { 1710 return getFromTargetType(Target.getPtrDiffType(0)); 1711} 1712 1713//===----------------------------------------------------------------------===// 1714// Type Operators 1715//===----------------------------------------------------------------------===// 1716 1717/// getCanonicalType - Return the canonical (structural) type corresponding to 1718/// the specified potentially non-canonical type. The non-canonical version 1719/// of a type may have many "decorated" versions of types. Decorators can 1720/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 1721/// to be free of any of these, allowing two canonical types to be compared 1722/// for exact equality with a simple pointer comparison. 1723QualType ASTContext::getCanonicalType(QualType T) { 1724 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 1725 1726 // If the result has type qualifiers, make sure to canonicalize them as well. 1727 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 1728 if (TypeQuals == 0) return CanType; 1729 1730 // If the type qualifiers are on an array type, get the canonical type of the 1731 // array with the qualifiers applied to the element type. 1732 ArrayType *AT = dyn_cast<ArrayType>(CanType); 1733 if (!AT) 1734 return CanType.getQualifiedType(TypeQuals); 1735 1736 // Get the canonical version of the element with the extra qualifiers on it. 1737 // This can recursively sink qualifiers through multiple levels of arrays. 1738 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 1739 NewEltTy = getCanonicalType(NewEltTy); 1740 1741 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1742 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 1743 CAT->getIndexTypeQualifier()); 1744 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 1745 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 1746 IAT->getIndexTypeQualifier()); 1747 1748 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 1749 return getDependentSizedArrayType(NewEltTy, DSAT->getSizeExpr(), 1750 DSAT->getSizeModifier(), 1751 DSAT->getIndexTypeQualifier()); 1752 1753 VariableArrayType *VAT = cast<VariableArrayType>(AT); 1754 return getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1755 VAT->getSizeModifier(), 1756 VAT->getIndexTypeQualifier()); 1757} 1758 1759Decl *ASTContext::getCanonicalDecl(Decl *D) { 1760 if (!D) 1761 return 0; 1762 1763 if (TagDecl *Tag = dyn_cast<TagDecl>(D)) { 1764 QualType T = getTagDeclType(Tag); 1765 return cast<TagDecl>(cast<TagType>(T.getTypePtr()->CanonicalType) 1766 ->getDecl()); 1767 } 1768 1769 if (ClassTemplateDecl *Template = dyn_cast<ClassTemplateDecl>(D)) { 1770 while (Template->getPreviousDeclaration()) 1771 Template = Template->getPreviousDeclaration(); 1772 return Template; 1773 } 1774 1775 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 1776 while (Function->getPreviousDeclaration()) 1777 Function = Function->getPreviousDeclaration(); 1778 return const_cast<FunctionDecl *>(Function); 1779 } 1780 1781 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 1782 while (Var->getPreviousDeclaration()) 1783 Var = Var->getPreviousDeclaration(); 1784 return const_cast<VarDecl *>(Var); 1785 } 1786 1787 return D; 1788} 1789 1790TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 1791 // If this template name refers to a template, the canonical 1792 // template name merely stores the template itself. 1793 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 1794 return TemplateName(cast<TemplateDecl>(getCanonicalDecl(Template))); 1795 1796 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 1797 assert(DTN && "Non-dependent template names must refer to template decls."); 1798 return DTN->CanonicalTemplateName; 1799} 1800 1801NestedNameSpecifier * 1802ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 1803 if (!NNS) 1804 return 0; 1805 1806 switch (NNS->getKind()) { 1807 case NestedNameSpecifier::Identifier: 1808 // Canonicalize the prefix but keep the identifier the same. 1809 return NestedNameSpecifier::Create(*this, 1810 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 1811 NNS->getAsIdentifier()); 1812 1813 case NestedNameSpecifier::Namespace: 1814 // A namespace is canonical; build a nested-name-specifier with 1815 // this namespace and no prefix. 1816 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 1817 1818 case NestedNameSpecifier::TypeSpec: 1819 case NestedNameSpecifier::TypeSpecWithTemplate: { 1820 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 1821 NestedNameSpecifier *Prefix = 0; 1822 1823 // FIXME: This isn't the right check! 1824 if (T->isDependentType()) 1825 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 1826 1827 return NestedNameSpecifier::Create(*this, Prefix, 1828 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 1829 T.getTypePtr()); 1830 } 1831 1832 case NestedNameSpecifier::Global: 1833 // The global specifier is canonical and unique. 1834 return NNS; 1835 } 1836 1837 // Required to silence a GCC warning 1838 return 0; 1839} 1840 1841 1842const ArrayType *ASTContext::getAsArrayType(QualType T) { 1843 // Handle the non-qualified case efficiently. 1844 if (T.getCVRQualifiers() == 0) { 1845 // Handle the common positive case fast. 1846 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 1847 return AT; 1848 } 1849 1850 // Handle the common negative case fast, ignoring CVR qualifiers. 1851 QualType CType = T->getCanonicalTypeInternal(); 1852 1853 // Make sure to look through type qualifiers (like ExtQuals) for the negative 1854 // test. 1855 if (!isa<ArrayType>(CType) && 1856 !isa<ArrayType>(CType.getUnqualifiedType())) 1857 return 0; 1858 1859 // Apply any CVR qualifiers from the array type to the element type. This 1860 // implements C99 6.7.3p8: "If the specification of an array type includes 1861 // any type qualifiers, the element type is so qualified, not the array type." 1862 1863 // If we get here, we either have type qualifiers on the type, or we have 1864 // sugar such as a typedef in the way. If we have type qualifiers on the type 1865 // we must propagate them down into the elemeng type. 1866 unsigned CVRQuals = T.getCVRQualifiers(); 1867 unsigned AddrSpace = 0; 1868 Type *Ty = T.getTypePtr(); 1869 1870 // Rip through ExtQualType's and typedefs to get to a concrete type. 1871 while (1) { 1872 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 1873 AddrSpace = EXTQT->getAddressSpace(); 1874 Ty = EXTQT->getBaseType(); 1875 } else { 1876 T = Ty->getDesugaredType(); 1877 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 1878 break; 1879 CVRQuals |= T.getCVRQualifiers(); 1880 Ty = T.getTypePtr(); 1881 } 1882 } 1883 1884 // If we have a simple case, just return now. 1885 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 1886 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 1887 return ATy; 1888 1889 // Otherwise, we have an array and we have qualifiers on it. Push the 1890 // qualifiers into the array element type and return a new array type. 1891 // Get the canonical version of the element with the extra qualifiers on it. 1892 // This can recursively sink qualifiers through multiple levels of arrays. 1893 QualType NewEltTy = ATy->getElementType(); 1894 if (AddrSpace) 1895 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 1896 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 1897 1898 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 1899 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 1900 CAT->getSizeModifier(), 1901 CAT->getIndexTypeQualifier())); 1902 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 1903 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 1904 IAT->getSizeModifier(), 1905 IAT->getIndexTypeQualifier())); 1906 1907 if (const DependentSizedArrayType *DSAT 1908 = dyn_cast<DependentSizedArrayType>(ATy)) 1909 return cast<ArrayType>( 1910 getDependentSizedArrayType(NewEltTy, 1911 DSAT->getSizeExpr(), 1912 DSAT->getSizeModifier(), 1913 DSAT->getIndexTypeQualifier())); 1914 1915 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 1916 return cast<ArrayType>(getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1917 VAT->getSizeModifier(), 1918 VAT->getIndexTypeQualifier())); 1919} 1920 1921 1922/// getArrayDecayedType - Return the properly qualified result of decaying the 1923/// specified array type to a pointer. This operation is non-trivial when 1924/// handling typedefs etc. The canonical type of "T" must be an array type, 1925/// this returns a pointer to a properly qualified element of the array. 1926/// 1927/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 1928QualType ASTContext::getArrayDecayedType(QualType Ty) { 1929 // Get the element type with 'getAsArrayType' so that we don't lose any 1930 // typedefs in the element type of the array. This also handles propagation 1931 // of type qualifiers from the array type into the element type if present 1932 // (C99 6.7.3p8). 1933 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 1934 assert(PrettyArrayType && "Not an array type!"); 1935 1936 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 1937 1938 // int x[restrict 4] -> int *restrict 1939 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 1940} 1941 1942QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 1943 QualType ElemTy = VAT->getElementType(); 1944 1945 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 1946 return getBaseElementType(VAT); 1947 1948 return ElemTy; 1949} 1950 1951/// getFloatingRank - Return a relative rank for floating point types. 1952/// This routine will assert if passed a built-in type that isn't a float. 1953static FloatingRank getFloatingRank(QualType T) { 1954 if (const ComplexType *CT = T->getAsComplexType()) 1955 return getFloatingRank(CT->getElementType()); 1956 1957 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 1958 switch (T->getAsBuiltinType()->getKind()) { 1959 default: assert(0 && "getFloatingRank(): not a floating type"); 1960 case BuiltinType::Float: return FloatRank; 1961 case BuiltinType::Double: return DoubleRank; 1962 case BuiltinType::LongDouble: return LongDoubleRank; 1963 } 1964} 1965 1966/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 1967/// point or a complex type (based on typeDomain/typeSize). 1968/// 'typeDomain' is a real floating point or complex type. 1969/// 'typeSize' is a real floating point or complex type. 1970QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 1971 QualType Domain) const { 1972 FloatingRank EltRank = getFloatingRank(Size); 1973 if (Domain->isComplexType()) { 1974 switch (EltRank) { 1975 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1976 case FloatRank: return FloatComplexTy; 1977 case DoubleRank: return DoubleComplexTy; 1978 case LongDoubleRank: return LongDoubleComplexTy; 1979 } 1980 } 1981 1982 assert(Domain->isRealFloatingType() && "Unknown domain!"); 1983 switch (EltRank) { 1984 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1985 case FloatRank: return FloatTy; 1986 case DoubleRank: return DoubleTy; 1987 case LongDoubleRank: return LongDoubleTy; 1988 } 1989} 1990 1991/// getFloatingTypeOrder - Compare the rank of the two specified floating 1992/// point types, ignoring the domain of the type (i.e. 'double' == 1993/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 1994/// LHS < RHS, return -1. 1995int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 1996 FloatingRank LHSR = getFloatingRank(LHS); 1997 FloatingRank RHSR = getFloatingRank(RHS); 1998 1999 if (LHSR == RHSR) 2000 return 0; 2001 if (LHSR > RHSR) 2002 return 1; 2003 return -1; 2004} 2005 2006/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2007/// routine will assert if passed a built-in type that isn't an integer or enum, 2008/// or if it is not canonicalized. 2009unsigned ASTContext::getIntegerRank(Type *T) { 2010 assert(T->isCanonical() && "T should be canonicalized"); 2011 if (EnumType* ET = dyn_cast<EnumType>(T)) 2012 T = ET->getDecl()->getIntegerType().getTypePtr(); 2013 2014 // There are two things which impact the integer rank: the width, and 2015 // the ordering of builtins. The builtin ordering is encoded in the 2016 // bottom three bits; the width is encoded in the bits above that. 2017 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2018 return FWIT->getWidth() << 3; 2019 2020 switch (cast<BuiltinType>(T)->getKind()) { 2021 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2022 case BuiltinType::Bool: 2023 return 1 + (getIntWidth(BoolTy) << 3); 2024 case BuiltinType::Char_S: 2025 case BuiltinType::Char_U: 2026 case BuiltinType::SChar: 2027 case BuiltinType::UChar: 2028 return 2 + (getIntWidth(CharTy) << 3); 2029 case BuiltinType::Short: 2030 case BuiltinType::UShort: 2031 return 3 + (getIntWidth(ShortTy) << 3); 2032 case BuiltinType::Int: 2033 case BuiltinType::UInt: 2034 return 4 + (getIntWidth(IntTy) << 3); 2035 case BuiltinType::Long: 2036 case BuiltinType::ULong: 2037 return 5 + (getIntWidth(LongTy) << 3); 2038 case BuiltinType::LongLong: 2039 case BuiltinType::ULongLong: 2040 return 6 + (getIntWidth(LongLongTy) << 3); 2041 case BuiltinType::Int128: 2042 case BuiltinType::UInt128: 2043 return 7 + (getIntWidth(Int128Ty) << 3); 2044 } 2045} 2046 2047/// getIntegerTypeOrder - Returns the highest ranked integer type: 2048/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2049/// LHS < RHS, return -1. 2050int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2051 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2052 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2053 if (LHSC == RHSC) return 0; 2054 2055 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2056 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2057 2058 unsigned LHSRank = getIntegerRank(LHSC); 2059 unsigned RHSRank = getIntegerRank(RHSC); 2060 2061 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2062 if (LHSRank == RHSRank) return 0; 2063 return LHSRank > RHSRank ? 1 : -1; 2064 } 2065 2066 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2067 if (LHSUnsigned) { 2068 // If the unsigned [LHS] type is larger, return it. 2069 if (LHSRank >= RHSRank) 2070 return 1; 2071 2072 // If the signed type can represent all values of the unsigned type, it 2073 // wins. Because we are dealing with 2's complement and types that are 2074 // powers of two larger than each other, this is always safe. 2075 return -1; 2076 } 2077 2078 // If the unsigned [RHS] type is larger, return it. 2079 if (RHSRank >= LHSRank) 2080 return -1; 2081 2082 // If the signed type can represent all values of the unsigned type, it 2083 // wins. Because we are dealing with 2's complement and types that are 2084 // powers of two larger than each other, this is always safe. 2085 return 1; 2086} 2087 2088// getCFConstantStringType - Return the type used for constant CFStrings. 2089QualType ASTContext::getCFConstantStringType() { 2090 if (!CFConstantStringTypeDecl) { 2091 CFConstantStringTypeDecl = 2092 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2093 &Idents.get("NSConstantString")); 2094 QualType FieldTypes[4]; 2095 2096 // const int *isa; 2097 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2098 // int flags; 2099 FieldTypes[1] = IntTy; 2100 // const char *str; 2101 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2102 // long length; 2103 FieldTypes[3] = LongTy; 2104 2105 // Create fields 2106 for (unsigned i = 0; i < 4; ++i) { 2107 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2108 SourceLocation(), 0, 2109 FieldTypes[i], /*BitWidth=*/0, 2110 /*Mutable=*/false); 2111 CFConstantStringTypeDecl->addDecl(*this, Field); 2112 } 2113 2114 CFConstantStringTypeDecl->completeDefinition(*this); 2115 } 2116 2117 return getTagDeclType(CFConstantStringTypeDecl); 2118} 2119 2120void ASTContext::setCFConstantStringType(QualType T) { 2121 const RecordType *Rec = T->getAsRecordType(); 2122 assert(Rec && "Invalid CFConstantStringType"); 2123 CFConstantStringTypeDecl = Rec->getDecl(); 2124} 2125 2126QualType ASTContext::getObjCFastEnumerationStateType() 2127{ 2128 if (!ObjCFastEnumerationStateTypeDecl) { 2129 ObjCFastEnumerationStateTypeDecl = 2130 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2131 &Idents.get("__objcFastEnumerationState")); 2132 2133 QualType FieldTypes[] = { 2134 UnsignedLongTy, 2135 getPointerType(ObjCIdType), 2136 getPointerType(UnsignedLongTy), 2137 getConstantArrayType(UnsignedLongTy, 2138 llvm::APInt(32, 5), ArrayType::Normal, 0) 2139 }; 2140 2141 for (size_t i = 0; i < 4; ++i) { 2142 FieldDecl *Field = FieldDecl::Create(*this, 2143 ObjCFastEnumerationStateTypeDecl, 2144 SourceLocation(), 0, 2145 FieldTypes[i], /*BitWidth=*/0, 2146 /*Mutable=*/false); 2147 ObjCFastEnumerationStateTypeDecl->addDecl(*this, Field); 2148 } 2149 2150 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2151 } 2152 2153 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2154} 2155 2156void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2157 const RecordType *Rec = T->getAsRecordType(); 2158 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2159 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2160} 2161 2162// This returns true if a type has been typedefed to BOOL: 2163// typedef <type> BOOL; 2164static bool isTypeTypedefedAsBOOL(QualType T) { 2165 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2166 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2167 return II->isStr("BOOL"); 2168 2169 return false; 2170} 2171 2172/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2173/// purpose. 2174int ASTContext::getObjCEncodingTypeSize(QualType type) { 2175 uint64_t sz = getTypeSize(type); 2176 2177 // Make all integer and enum types at least as large as an int 2178 if (sz > 0 && type->isIntegralType()) 2179 sz = std::max(sz, getTypeSize(IntTy)); 2180 // Treat arrays as pointers, since that's how they're passed in. 2181 else if (type->isArrayType()) 2182 sz = getTypeSize(VoidPtrTy); 2183 return sz / getTypeSize(CharTy); 2184} 2185 2186/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2187/// declaration. 2188void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2189 std::string& S) { 2190 // FIXME: This is not very efficient. 2191 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2192 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2193 // Encode result type. 2194 getObjCEncodingForType(Decl->getResultType(), S); 2195 // Compute size of all parameters. 2196 // Start with computing size of a pointer in number of bytes. 2197 // FIXME: There might(should) be a better way of doing this computation! 2198 SourceLocation Loc; 2199 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2200 // The first two arguments (self and _cmd) are pointers; account for 2201 // their size. 2202 int ParmOffset = 2 * PtrSize; 2203 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2204 E = Decl->param_end(); PI != E; ++PI) { 2205 QualType PType = (*PI)->getType(); 2206 int sz = getObjCEncodingTypeSize(PType); 2207 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2208 ParmOffset += sz; 2209 } 2210 S += llvm::utostr(ParmOffset); 2211 S += "@0:"; 2212 S += llvm::utostr(PtrSize); 2213 2214 // Argument types. 2215 ParmOffset = 2 * PtrSize; 2216 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2217 E = Decl->param_end(); PI != E; ++PI) { 2218 ParmVarDecl *PVDecl = *PI; 2219 QualType PType = PVDecl->getOriginalType(); 2220 if (const ArrayType *AT = 2221 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2222 // Use array's original type only if it has known number of 2223 // elements. 2224 if (!isa<ConstantArrayType>(AT)) 2225 PType = PVDecl->getType(); 2226 } else if (PType->isFunctionType()) 2227 PType = PVDecl->getType(); 2228 // Process argument qualifiers for user supplied arguments; such as, 2229 // 'in', 'inout', etc. 2230 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2231 getObjCEncodingForType(PType, S); 2232 S += llvm::utostr(ParmOffset); 2233 ParmOffset += getObjCEncodingTypeSize(PType); 2234 } 2235} 2236 2237/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2238/// property declaration. If non-NULL, Container must be either an 2239/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2240/// NULL when getting encodings for protocol properties. 2241/// Property attributes are stored as a comma-delimited C string. The simple 2242/// attributes readonly and bycopy are encoded as single characters. The 2243/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2244/// encoded as single characters, followed by an identifier. Property types 2245/// are also encoded as a parametrized attribute. The characters used to encode 2246/// these attributes are defined by the following enumeration: 2247/// @code 2248/// enum PropertyAttributes { 2249/// kPropertyReadOnly = 'R', // property is read-only. 2250/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2251/// kPropertyByref = '&', // property is a reference to the value last assigned 2252/// kPropertyDynamic = 'D', // property is dynamic 2253/// kPropertyGetter = 'G', // followed by getter selector name 2254/// kPropertySetter = 'S', // followed by setter selector name 2255/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2256/// kPropertyType = 't' // followed by old-style type encoding. 2257/// kPropertyWeak = 'W' // 'weak' property 2258/// kPropertyStrong = 'P' // property GC'able 2259/// kPropertyNonAtomic = 'N' // property non-atomic 2260/// }; 2261/// @endcode 2262void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2263 const Decl *Container, 2264 std::string& S) { 2265 // Collect information from the property implementation decl(s). 2266 bool Dynamic = false; 2267 ObjCPropertyImplDecl *SynthesizePID = 0; 2268 2269 // FIXME: Duplicated code due to poor abstraction. 2270 if (Container) { 2271 if (const ObjCCategoryImplDecl *CID = 2272 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2273 for (ObjCCategoryImplDecl::propimpl_iterator 2274 i = CID->propimpl_begin(*this), e = CID->propimpl_end(*this); 2275 i != e; ++i) { 2276 ObjCPropertyImplDecl *PID = *i; 2277 if (PID->getPropertyDecl() == PD) { 2278 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2279 Dynamic = true; 2280 } else { 2281 SynthesizePID = PID; 2282 } 2283 } 2284 } 2285 } else { 2286 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2287 for (ObjCCategoryImplDecl::propimpl_iterator 2288 i = OID->propimpl_begin(*this), e = OID->propimpl_end(*this); 2289 i != e; ++i) { 2290 ObjCPropertyImplDecl *PID = *i; 2291 if (PID->getPropertyDecl() == PD) { 2292 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2293 Dynamic = true; 2294 } else { 2295 SynthesizePID = PID; 2296 } 2297 } 2298 } 2299 } 2300 } 2301 2302 // FIXME: This is not very efficient. 2303 S = "T"; 2304 2305 // Encode result type. 2306 // GCC has some special rules regarding encoding of properties which 2307 // closely resembles encoding of ivars. 2308 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2309 true /* outermost type */, 2310 true /* encoding for property */); 2311 2312 if (PD->isReadOnly()) { 2313 S += ",R"; 2314 } else { 2315 switch (PD->getSetterKind()) { 2316 case ObjCPropertyDecl::Assign: break; 2317 case ObjCPropertyDecl::Copy: S += ",C"; break; 2318 case ObjCPropertyDecl::Retain: S += ",&"; break; 2319 } 2320 } 2321 2322 // It really isn't clear at all what this means, since properties 2323 // are "dynamic by default". 2324 if (Dynamic) 2325 S += ",D"; 2326 2327 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2328 S += ",N"; 2329 2330 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2331 S += ",G"; 2332 S += PD->getGetterName().getAsString(); 2333 } 2334 2335 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2336 S += ",S"; 2337 S += PD->getSetterName().getAsString(); 2338 } 2339 2340 if (SynthesizePID) { 2341 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2342 S += ",V"; 2343 S += OID->getNameAsString(); 2344 } 2345 2346 // FIXME: OBJCGC: weak & strong 2347} 2348 2349/// getLegacyIntegralTypeEncoding - 2350/// Another legacy compatibility encoding: 32-bit longs are encoded as 2351/// 'l' or 'L' , but not always. For typedefs, we need to use 2352/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2353/// 2354void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2355 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 2356 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2357 if (BT->getKind() == BuiltinType::ULong && 2358 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2359 PointeeTy = UnsignedIntTy; 2360 else 2361 if (BT->getKind() == BuiltinType::Long && 2362 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2363 PointeeTy = IntTy; 2364 } 2365 } 2366} 2367 2368void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2369 const FieldDecl *Field) { 2370 // We follow the behavior of gcc, expanding structures which are 2371 // directly pointed to, and expanding embedded structures. Note that 2372 // these rules are sufficient to prevent recursive encoding of the 2373 // same type. 2374 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2375 true /* outermost type */); 2376} 2377 2378static void EncodeBitField(const ASTContext *Context, std::string& S, 2379 const FieldDecl *FD) { 2380 const Expr *E = FD->getBitWidth(); 2381 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2382 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2383 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2384 S += 'b'; 2385 S += llvm::utostr(N); 2386} 2387 2388void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2389 bool ExpandPointedToStructures, 2390 bool ExpandStructures, 2391 const FieldDecl *FD, 2392 bool OutermostType, 2393 bool EncodingProperty) { 2394 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2395 if (FD && FD->isBitField()) { 2396 EncodeBitField(this, S, FD); 2397 } 2398 else { 2399 char encoding; 2400 switch (BT->getKind()) { 2401 default: assert(0 && "Unhandled builtin type kind"); 2402 case BuiltinType::Void: encoding = 'v'; break; 2403 case BuiltinType::Bool: encoding = 'B'; break; 2404 case BuiltinType::Char_U: 2405 case BuiltinType::UChar: encoding = 'C'; break; 2406 case BuiltinType::UShort: encoding = 'S'; break; 2407 case BuiltinType::UInt: encoding = 'I'; break; 2408 case BuiltinType::ULong: 2409 encoding = 2410 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2411 break; 2412 case BuiltinType::UInt128: encoding = 'T'; break; 2413 case BuiltinType::ULongLong: encoding = 'Q'; break; 2414 case BuiltinType::Char_S: 2415 case BuiltinType::SChar: encoding = 'c'; break; 2416 case BuiltinType::Short: encoding = 's'; break; 2417 case BuiltinType::Int: encoding = 'i'; break; 2418 case BuiltinType::Long: 2419 encoding = 2420 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2421 break; 2422 case BuiltinType::LongLong: encoding = 'q'; break; 2423 case BuiltinType::Int128: encoding = 't'; break; 2424 case BuiltinType::Float: encoding = 'f'; break; 2425 case BuiltinType::Double: encoding = 'd'; break; 2426 case BuiltinType::LongDouble: encoding = 'd'; break; 2427 } 2428 2429 S += encoding; 2430 } 2431 } else if (const ComplexType *CT = T->getAsComplexType()) { 2432 S += 'j'; 2433 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2434 false); 2435 } else if (T->isObjCQualifiedIdType()) { 2436 getObjCEncodingForTypeImpl(getObjCIdType(), S, 2437 ExpandPointedToStructures, 2438 ExpandStructures, FD); 2439 if (FD || EncodingProperty) { 2440 // Note that we do extended encoding of protocol qualifer list 2441 // Only when doing ivar or property encoding. 2442 const ObjCObjectPointerType *QIDT = T->getAsObjCQualifiedIdType(); 2443 S += '"'; 2444 for (ObjCObjectPointerType::qual_iterator I = QIDT->qual_begin(), 2445 E = QIDT->qual_end(); I != E; ++I) { 2446 S += '<'; 2447 S += (*I)->getNameAsString(); 2448 S += '>'; 2449 } 2450 S += '"'; 2451 } 2452 return; 2453 } 2454 else if (const PointerType *PT = T->getAsPointerType()) { 2455 QualType PointeeTy = PT->getPointeeType(); 2456 bool isReadOnly = false; 2457 // For historical/compatibility reasons, the read-only qualifier of the 2458 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2459 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2460 // Also, do not emit the 'r' for anything but the outermost type! 2461 if (dyn_cast<TypedefType>(T.getTypePtr())) { 2462 if (OutermostType && T.isConstQualified()) { 2463 isReadOnly = true; 2464 S += 'r'; 2465 } 2466 } 2467 else if (OutermostType) { 2468 QualType P = PointeeTy; 2469 while (P->getAsPointerType()) 2470 P = P->getAsPointerType()->getPointeeType(); 2471 if (P.isConstQualified()) { 2472 isReadOnly = true; 2473 S += 'r'; 2474 } 2475 } 2476 if (isReadOnly) { 2477 // Another legacy compatibility encoding. Some ObjC qualifier and type 2478 // combinations need to be rearranged. 2479 // Rewrite "in const" from "nr" to "rn" 2480 const char * s = S.c_str(); 2481 int len = S.length(); 2482 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2483 std::string replace = "rn"; 2484 S.replace(S.end()-2, S.end(), replace); 2485 } 2486 } 2487 if (isObjCIdStructType(PointeeTy)) { 2488 S += '@'; 2489 return; 2490 } 2491 else if (PointeeTy->isObjCInterfaceType()) { 2492 if (!EncodingProperty && 2493 isa<TypedefType>(PointeeTy.getTypePtr())) { 2494 // Another historical/compatibility reason. 2495 // We encode the underlying type which comes out as 2496 // {...}; 2497 S += '^'; 2498 getObjCEncodingForTypeImpl(PointeeTy, S, 2499 false, ExpandPointedToStructures, 2500 NULL); 2501 return; 2502 } 2503 S += '@'; 2504 if (FD || EncodingProperty) { 2505 const ObjCInterfaceType *OIT = 2506 PointeeTy.getUnqualifiedType()->getAsObjCInterfaceType(); 2507 ObjCInterfaceDecl *OI = OIT->getDecl(); 2508 S += '"'; 2509 S += OI->getNameAsCString(); 2510 for (ObjCInterfaceType::qual_iterator I = OIT->qual_begin(), 2511 E = OIT->qual_end(); I != E; ++I) { 2512 S += '<'; 2513 S += (*I)->getNameAsString(); 2514 S += '>'; 2515 } 2516 S += '"'; 2517 } 2518 return; 2519 } else if (isObjCClassStructType(PointeeTy)) { 2520 S += '#'; 2521 return; 2522 } else if (isObjCSelType(PointeeTy)) { 2523 S += ':'; 2524 return; 2525 } 2526 2527 if (PointeeTy->isCharType()) { 2528 // char pointer types should be encoded as '*' unless it is a 2529 // type that has been typedef'd to 'BOOL'. 2530 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2531 S += '*'; 2532 return; 2533 } 2534 } 2535 2536 S += '^'; 2537 getLegacyIntegralTypeEncoding(PointeeTy); 2538 2539 getObjCEncodingForTypeImpl(PointeeTy, S, 2540 false, ExpandPointedToStructures, 2541 NULL); 2542 } else if (const ArrayType *AT = 2543 // Ignore type qualifiers etc. 2544 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2545 if (isa<IncompleteArrayType>(AT)) { 2546 // Incomplete arrays are encoded as a pointer to the array element. 2547 S += '^'; 2548 2549 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2550 false, ExpandStructures, FD); 2551 } else { 2552 S += '['; 2553 2554 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2555 S += llvm::utostr(CAT->getSize().getZExtValue()); 2556 else { 2557 //Variable length arrays are encoded as a regular array with 0 elements. 2558 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2559 S += '0'; 2560 } 2561 2562 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2563 false, ExpandStructures, FD); 2564 S += ']'; 2565 } 2566 } else if (T->getAsFunctionType()) { 2567 S += '?'; 2568 } else if (const RecordType *RTy = T->getAsRecordType()) { 2569 RecordDecl *RDecl = RTy->getDecl(); 2570 S += RDecl->isUnion() ? '(' : '{'; 2571 // Anonymous structures print as '?' 2572 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2573 S += II->getName(); 2574 } else { 2575 S += '?'; 2576 } 2577 if (ExpandStructures) { 2578 S += '='; 2579 for (RecordDecl::field_iterator Field = RDecl->field_begin(*this), 2580 FieldEnd = RDecl->field_end(*this); 2581 Field != FieldEnd; ++Field) { 2582 if (FD) { 2583 S += '"'; 2584 S += Field->getNameAsString(); 2585 S += '"'; 2586 } 2587 2588 // Special case bit-fields. 2589 if (Field->isBitField()) { 2590 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2591 (*Field)); 2592 } else { 2593 QualType qt = Field->getType(); 2594 getLegacyIntegralTypeEncoding(qt); 2595 getObjCEncodingForTypeImpl(qt, S, false, true, 2596 FD); 2597 } 2598 } 2599 } 2600 S += RDecl->isUnion() ? ')' : '}'; 2601 } else if (T->isEnumeralType()) { 2602 if (FD && FD->isBitField()) 2603 EncodeBitField(this, S, FD); 2604 else 2605 S += 'i'; 2606 } else if (T->isBlockPointerType()) { 2607 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2608 } else if (T->isObjCInterfaceType()) { 2609 // @encode(class_name) 2610 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2611 S += '{'; 2612 const IdentifierInfo *II = OI->getIdentifier(); 2613 S += II->getName(); 2614 S += '='; 2615 llvm::SmallVector<FieldDecl*, 32> RecFields; 2616 CollectObjCIvars(OI, RecFields); 2617 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2618 if (RecFields[i]->isBitField()) 2619 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2620 RecFields[i]); 2621 else 2622 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2623 FD); 2624 } 2625 S += '}'; 2626 } 2627 else 2628 assert(0 && "@encode for type not implemented!"); 2629} 2630 2631void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2632 std::string& S) const { 2633 if (QT & Decl::OBJC_TQ_In) 2634 S += 'n'; 2635 if (QT & Decl::OBJC_TQ_Inout) 2636 S += 'N'; 2637 if (QT & Decl::OBJC_TQ_Out) 2638 S += 'o'; 2639 if (QT & Decl::OBJC_TQ_Bycopy) 2640 S += 'O'; 2641 if (QT & Decl::OBJC_TQ_Byref) 2642 S += 'R'; 2643 if (QT & Decl::OBJC_TQ_Oneway) 2644 S += 'V'; 2645} 2646 2647void ASTContext::setBuiltinVaListType(QualType T) 2648{ 2649 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2650 2651 BuiltinVaListType = T; 2652} 2653 2654void ASTContext::setObjCIdType(QualType T) 2655{ 2656 ObjCIdType = T; 2657 2658 const TypedefType *TT = T->getAsTypedefType(); 2659 if (!TT) 2660 return; 2661 2662 TypedefDecl *TD = TT->getDecl(); 2663 2664 // typedef struct objc_object *id; 2665 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2666 // User error - caller will issue diagnostics. 2667 if (!ptr) 2668 return; 2669 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2670 // User error - caller will issue diagnostics. 2671 if (!rec) 2672 return; 2673 IdStructType = rec; 2674} 2675 2676void ASTContext::setObjCSelType(QualType T) 2677{ 2678 ObjCSelType = T; 2679 2680 const TypedefType *TT = T->getAsTypedefType(); 2681 if (!TT) 2682 return; 2683 TypedefDecl *TD = TT->getDecl(); 2684 2685 // typedef struct objc_selector *SEL; 2686 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2687 if (!ptr) 2688 return; 2689 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2690 if (!rec) 2691 return; 2692 SelStructType = rec; 2693} 2694 2695void ASTContext::setObjCProtoType(QualType QT) 2696{ 2697 ObjCProtoType = QT; 2698} 2699 2700void ASTContext::setObjCClassType(QualType T) 2701{ 2702 ObjCClassType = T; 2703 2704 const TypedefType *TT = T->getAsTypedefType(); 2705 if (!TT) 2706 return; 2707 TypedefDecl *TD = TT->getDecl(); 2708 2709 // typedef struct objc_class *Class; 2710 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2711 assert(ptr && "'Class' incorrectly typed"); 2712 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2713 assert(rec && "'Class' incorrectly typed"); 2714 ClassStructType = rec; 2715} 2716 2717void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 2718 assert(ObjCConstantStringType.isNull() && 2719 "'NSConstantString' type already set!"); 2720 2721 ObjCConstantStringType = getObjCInterfaceType(Decl); 2722} 2723 2724/// \brief Retrieve the template name that represents a qualified 2725/// template name such as \c std::vector. 2726TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 2727 bool TemplateKeyword, 2728 TemplateDecl *Template) { 2729 llvm::FoldingSetNodeID ID; 2730 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 2731 2732 void *InsertPos = 0; 2733 QualifiedTemplateName *QTN = 2734 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2735 if (!QTN) { 2736 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 2737 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 2738 } 2739 2740 return TemplateName(QTN); 2741} 2742 2743/// \brief Retrieve the template name that represents a dependent 2744/// template name such as \c MetaFun::template apply. 2745TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 2746 const IdentifierInfo *Name) { 2747 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 2748 2749 llvm::FoldingSetNodeID ID; 2750 DependentTemplateName::Profile(ID, NNS, Name); 2751 2752 void *InsertPos = 0; 2753 DependentTemplateName *QTN = 2754 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2755 2756 if (QTN) 2757 return TemplateName(QTN); 2758 2759 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2760 if (CanonNNS == NNS) { 2761 QTN = new (*this,4) DependentTemplateName(NNS, Name); 2762 } else { 2763 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 2764 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 2765 } 2766 2767 DependentTemplateNames.InsertNode(QTN, InsertPos); 2768 return TemplateName(QTN); 2769} 2770 2771/// getFromTargetType - Given one of the integer types provided by 2772/// TargetInfo, produce the corresponding type. The unsigned @p Type 2773/// is actually a value of type @c TargetInfo::IntType. 2774QualType ASTContext::getFromTargetType(unsigned Type) const { 2775 switch (Type) { 2776 case TargetInfo::NoInt: return QualType(); 2777 case TargetInfo::SignedShort: return ShortTy; 2778 case TargetInfo::UnsignedShort: return UnsignedShortTy; 2779 case TargetInfo::SignedInt: return IntTy; 2780 case TargetInfo::UnsignedInt: return UnsignedIntTy; 2781 case TargetInfo::SignedLong: return LongTy; 2782 case TargetInfo::UnsignedLong: return UnsignedLongTy; 2783 case TargetInfo::SignedLongLong: return LongLongTy; 2784 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 2785 } 2786 2787 assert(false && "Unhandled TargetInfo::IntType value"); 2788 return QualType(); 2789} 2790 2791//===----------------------------------------------------------------------===// 2792// Type Predicates. 2793//===----------------------------------------------------------------------===// 2794 2795/// isObjCNSObjectType - Return true if this is an NSObject object using 2796/// NSObject attribute on a c-style pointer type. 2797/// FIXME - Make it work directly on types. 2798/// 2799bool ASTContext::isObjCNSObjectType(QualType Ty) const { 2800 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2801 if (TypedefDecl *TD = TDT->getDecl()) 2802 if (TD->getAttr<ObjCNSObjectAttr>(*const_cast<ASTContext*>(this))) 2803 return true; 2804 } 2805 return false; 2806} 2807 2808/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 2809/// to an object type. This includes "id" and "Class" (two 'special' pointers 2810/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 2811/// ID type). 2812bool ASTContext::isObjCObjectPointerType(QualType Ty) const { 2813 if (Ty->isObjCQualifiedIdType()) 2814 return true; 2815 2816 // Blocks are objects. 2817 if (Ty->isBlockPointerType()) 2818 return true; 2819 2820 // All other object types are pointers. 2821 const PointerType *PT = Ty->getAsPointerType(); 2822 if (PT == 0) 2823 return false; 2824 2825 // If this a pointer to an interface (e.g. NSString*), it is ok. 2826 if (PT->getPointeeType()->isObjCInterfaceType() || 2827 // If is has NSObject attribute, OK as well. 2828 isObjCNSObjectType(Ty)) 2829 return true; 2830 2831 // Check to see if this is 'id' or 'Class', both of which are typedefs for 2832 // pointer types. This looks for the typedef specifically, not for the 2833 // underlying type. Iteratively strip off typedefs so that we can handle 2834 // typedefs of typedefs. 2835 while (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2836 if (Ty.getUnqualifiedType() == getObjCIdType() || 2837 Ty.getUnqualifiedType() == getObjCClassType()) 2838 return true; 2839 2840 Ty = TDT->getDecl()->getUnderlyingType(); 2841 } 2842 2843 return false; 2844} 2845 2846/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 2847/// garbage collection attribute. 2848/// 2849QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 2850 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 2851 if (getLangOptions().ObjC1 && 2852 getLangOptions().getGCMode() != LangOptions::NonGC) { 2853 GCAttrs = Ty.getObjCGCAttr(); 2854 // Default behavious under objective-c's gc is for objective-c pointers 2855 // (or pointers to them) be treated as though they were declared 2856 // as __strong. 2857 if (GCAttrs == QualType::GCNone) { 2858 if (isObjCObjectPointerType(Ty)) 2859 GCAttrs = QualType::Strong; 2860 else if (Ty->isPointerType()) 2861 return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType()); 2862 } 2863 // Non-pointers have none gc'able attribute regardless of the attribute 2864 // set on them. 2865 else if (!Ty->isPointerType() && !isObjCObjectPointerType(Ty)) 2866 return QualType::GCNone; 2867 } 2868 return GCAttrs; 2869} 2870 2871//===----------------------------------------------------------------------===// 2872// Type Compatibility Testing 2873//===----------------------------------------------------------------------===// 2874 2875/// areCompatVectorTypes - Return true if the two specified vector types are 2876/// compatible. 2877static bool areCompatVectorTypes(const VectorType *LHS, 2878 const VectorType *RHS) { 2879 assert(LHS->isCanonical() && RHS->isCanonical()); 2880 return LHS->getElementType() == RHS->getElementType() && 2881 LHS->getNumElements() == RHS->getNumElements(); 2882} 2883 2884/// canAssignObjCInterfaces - Return true if the two interface types are 2885/// compatible for assignment from RHS to LHS. This handles validation of any 2886/// protocol qualifiers on the LHS or RHS. 2887/// 2888bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 2889 const ObjCInterfaceType *RHS) { 2890 // Verify that the base decls are compatible: the RHS must be a subclass of 2891 // the LHS. 2892 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 2893 return false; 2894 2895 // RHS must have a superset of the protocols in the LHS. If the LHS is not 2896 // protocol qualified at all, then we are good. 2897 if (!isa<ObjCQualifiedInterfaceType>(LHS)) 2898 return true; 2899 2900 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 2901 // isn't a superset. 2902 if (!isa<ObjCQualifiedInterfaceType>(RHS)) 2903 return true; // FIXME: should return false! 2904 2905 // Finally, we must have two protocol-qualified interfaces. 2906 const ObjCQualifiedInterfaceType *LHSP =cast<ObjCQualifiedInterfaceType>(LHS); 2907 const ObjCQualifiedInterfaceType *RHSP =cast<ObjCQualifiedInterfaceType>(RHS); 2908 2909 // All LHS protocols must have a presence on the RHS. 2910 assert(LHSP->qual_begin() != LHSP->qual_end() && "Empty LHS protocol list?"); 2911 2912 for (ObjCQualifiedInterfaceType::qual_iterator LHSPI = LHSP->qual_begin(), 2913 LHSPE = LHSP->qual_end(); 2914 LHSPI != LHSPE; LHSPI++) { 2915 bool RHSImplementsProtocol = false; 2916 2917 // If the RHS doesn't implement the protocol on the left, the types 2918 // are incompatible. 2919 for (ObjCQualifiedInterfaceType::qual_iterator RHSPI = RHSP->qual_begin(), 2920 RHSPE = RHSP->qual_end(); 2921 !RHSImplementsProtocol && (RHSPI != RHSPE); RHSPI++) { 2922 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) 2923 RHSImplementsProtocol = true; 2924 } 2925 // FIXME: For better diagnostics, consider passing back the protocol name. 2926 if (!RHSImplementsProtocol) 2927 return false; 2928 } 2929 // The RHS implements all protocols listed on the LHS. 2930 return true; 2931} 2932 2933bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 2934 // get the "pointed to" types 2935 const PointerType *LHSPT = LHS->getAsPointerType(); 2936 const PointerType *RHSPT = RHS->getAsPointerType(); 2937 2938 if (!LHSPT || !RHSPT) 2939 return false; 2940 2941 QualType lhptee = LHSPT->getPointeeType(); 2942 QualType rhptee = RHSPT->getPointeeType(); 2943 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2944 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2945 // ID acts sort of like void* for ObjC interfaces 2946 if (LHSIface && isObjCIdStructType(rhptee)) 2947 return true; 2948 if (RHSIface && isObjCIdStructType(lhptee)) 2949 return true; 2950 if (!LHSIface || !RHSIface) 2951 return false; 2952 return canAssignObjCInterfaces(LHSIface, RHSIface) || 2953 canAssignObjCInterfaces(RHSIface, LHSIface); 2954} 2955 2956/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 2957/// both shall have the identically qualified version of a compatible type. 2958/// C99 6.2.7p1: Two types have compatible types if their types are the 2959/// same. See 6.7.[2,3,5] for additional rules. 2960bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 2961 return !mergeTypes(LHS, RHS).isNull(); 2962} 2963 2964QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 2965 const FunctionType *lbase = lhs->getAsFunctionType(); 2966 const FunctionType *rbase = rhs->getAsFunctionType(); 2967 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 2968 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 2969 bool allLTypes = true; 2970 bool allRTypes = true; 2971 2972 // Check return type 2973 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 2974 if (retType.isNull()) return QualType(); 2975 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 2976 allLTypes = false; 2977 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 2978 allRTypes = false; 2979 2980 if (lproto && rproto) { // two C99 style function prototypes 2981 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 2982 "C++ shouldn't be here"); 2983 unsigned lproto_nargs = lproto->getNumArgs(); 2984 unsigned rproto_nargs = rproto->getNumArgs(); 2985 2986 // Compatible functions must have the same number of arguments 2987 if (lproto_nargs != rproto_nargs) 2988 return QualType(); 2989 2990 // Variadic and non-variadic functions aren't compatible 2991 if (lproto->isVariadic() != rproto->isVariadic()) 2992 return QualType(); 2993 2994 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 2995 return QualType(); 2996 2997 // Check argument compatibility 2998 llvm::SmallVector<QualType, 10> types; 2999 for (unsigned i = 0; i < lproto_nargs; i++) { 3000 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3001 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3002 QualType argtype = mergeTypes(largtype, rargtype); 3003 if (argtype.isNull()) return QualType(); 3004 types.push_back(argtype); 3005 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3006 allLTypes = false; 3007 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3008 allRTypes = false; 3009 } 3010 if (allLTypes) return lhs; 3011 if (allRTypes) return rhs; 3012 return getFunctionType(retType, types.begin(), types.size(), 3013 lproto->isVariadic(), lproto->getTypeQuals()); 3014 } 3015 3016 if (lproto) allRTypes = false; 3017 if (rproto) allLTypes = false; 3018 3019 const FunctionProtoType *proto = lproto ? lproto : rproto; 3020 if (proto) { 3021 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3022 if (proto->isVariadic()) return QualType(); 3023 // Check that the types are compatible with the types that 3024 // would result from default argument promotions (C99 6.7.5.3p15). 3025 // The only types actually affected are promotable integer 3026 // types and floats, which would be passed as a different 3027 // type depending on whether the prototype is visible. 3028 unsigned proto_nargs = proto->getNumArgs(); 3029 for (unsigned i = 0; i < proto_nargs; ++i) { 3030 QualType argTy = proto->getArgType(i); 3031 if (argTy->isPromotableIntegerType() || 3032 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3033 return QualType(); 3034 } 3035 3036 if (allLTypes) return lhs; 3037 if (allRTypes) return rhs; 3038 return getFunctionType(retType, proto->arg_type_begin(), 3039 proto->getNumArgs(), lproto->isVariadic(), 3040 lproto->getTypeQuals()); 3041 } 3042 3043 if (allLTypes) return lhs; 3044 if (allRTypes) return rhs; 3045 return getFunctionNoProtoType(retType); 3046} 3047 3048QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3049 // C++ [expr]: If an expression initially has the type "reference to T", the 3050 // type is adjusted to "T" prior to any further analysis, the expression 3051 // designates the object or function denoted by the reference, and the 3052 // expression is an lvalue unless the reference is an rvalue reference and 3053 // the expression is a function call (possibly inside parentheses). 3054 // FIXME: C++ shouldn't be going through here! The rules are different 3055 // enough that they should be handled separately. 3056 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3057 // shouldn't be going through here! 3058 if (const ReferenceType *RT = LHS->getAsReferenceType()) 3059 LHS = RT->getPointeeType(); 3060 if (const ReferenceType *RT = RHS->getAsReferenceType()) 3061 RHS = RT->getPointeeType(); 3062 3063 QualType LHSCan = getCanonicalType(LHS), 3064 RHSCan = getCanonicalType(RHS); 3065 3066 // If two types are identical, they are compatible. 3067 if (LHSCan == RHSCan) 3068 return LHS; 3069 3070 // If the qualifiers are different, the types aren't compatible 3071 // Note that we handle extended qualifiers later, in the 3072 // case for ExtQualType. 3073 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3074 return QualType(); 3075 3076 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3077 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3078 3079 // We want to consider the two function types to be the same for these 3080 // comparisons, just force one to the other. 3081 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3082 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3083 3084 // Strip off objc_gc attributes off the top level so they can be merged. 3085 // This is a complete mess, but the attribute itself doesn't make much sense. 3086 if (RHSClass == Type::ExtQual) { 3087 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3088 if (GCAttr != QualType::GCNone) { 3089 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3090 // __weak attribute must appear on both declarations. 3091 // __strong attribue is redundant if other decl is an objective-c 3092 // object pointer (or decorated with __strong attribute); otherwise 3093 // issue error. 3094 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3095 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3096 LHSCan->isPointerType() && !isObjCObjectPointerType(LHSCan) && 3097 !isObjCIdStructType(LHSCan->getAsPointerType()->getPointeeType()))) 3098 return QualType(); 3099 3100 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3101 RHS.getCVRQualifiers()); 3102 QualType Result = mergeTypes(LHS, RHS); 3103 if (!Result.isNull()) { 3104 if (Result.getObjCGCAttr() == QualType::GCNone) 3105 Result = getObjCGCQualType(Result, GCAttr); 3106 else if (Result.getObjCGCAttr() != GCAttr) 3107 Result = QualType(); 3108 } 3109 return Result; 3110 } 3111 } 3112 if (LHSClass == Type::ExtQual) { 3113 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3114 if (GCAttr != QualType::GCNone) { 3115 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3116 // __weak attribute must appear on both declarations. __strong 3117 // __strong attribue is redundant if other decl is an objective-c 3118 // object pointer (or decorated with __strong attribute); otherwise 3119 // issue error. 3120 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3121 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3122 RHSCan->isPointerType() && !isObjCObjectPointerType(RHSCan) && 3123 !isObjCIdStructType(RHSCan->getAsPointerType()->getPointeeType()))) 3124 return QualType(); 3125 3126 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3127 LHS.getCVRQualifiers()); 3128 QualType Result = mergeTypes(LHS, RHS); 3129 if (!Result.isNull()) { 3130 if (Result.getObjCGCAttr() == QualType::GCNone) 3131 Result = getObjCGCQualType(Result, GCAttr); 3132 else if (Result.getObjCGCAttr() != GCAttr) 3133 Result = QualType(); 3134 } 3135 return Result; 3136 } 3137 } 3138 3139 // Same as above for arrays 3140 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3141 LHSClass = Type::ConstantArray; 3142 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3143 RHSClass = Type::ConstantArray; 3144 3145 // Canonicalize ExtVector -> Vector. 3146 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3147 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3148 3149 // Consider qualified interfaces and interfaces the same. 3150 if (LHSClass == Type::ObjCQualifiedInterface) LHSClass = Type::ObjCInterface; 3151 if (RHSClass == Type::ObjCQualifiedInterface) RHSClass = Type::ObjCInterface; 3152 3153 // If the canonical type classes don't match. 3154 if (LHSClass != RHSClass) { 3155 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3156 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3157 3158 // 'id' and 'Class' act sort of like void* for ObjC interfaces 3159 if (LHSIface && (isObjCIdStructType(RHS) || isObjCClassStructType(RHS))) 3160 return LHS; 3161 if (RHSIface && (isObjCIdStructType(LHS) || isObjCClassStructType(LHS))) 3162 return RHS; 3163 3164 // ID is compatible with all qualified id types. 3165 if (LHS->isObjCQualifiedIdType()) { 3166 if (const PointerType *PT = RHS->getAsPointerType()) { 3167 QualType pType = PT->getPointeeType(); 3168 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3169 return LHS; 3170 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3171 // Unfortunately, this API is part of Sema (which we don't have access 3172 // to. Need to refactor. The following check is insufficient, since we 3173 // need to make sure the class implements the protocol. 3174 if (pType->isObjCInterfaceType()) 3175 return LHS; 3176 } 3177 } 3178 if (RHS->isObjCQualifiedIdType()) { 3179 if (const PointerType *PT = LHS->getAsPointerType()) { 3180 QualType pType = PT->getPointeeType(); 3181 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3182 return RHS; 3183 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3184 // Unfortunately, this API is part of Sema (which we don't have access 3185 // to. Need to refactor. The following check is insufficient, since we 3186 // need to make sure the class implements the protocol. 3187 if (pType->isObjCInterfaceType()) 3188 return RHS; 3189 } 3190 } 3191 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3192 // a signed integer type, or an unsigned integer type. 3193 if (const EnumType* ETy = LHS->getAsEnumType()) { 3194 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3195 return RHS; 3196 } 3197 if (const EnumType* ETy = RHS->getAsEnumType()) { 3198 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3199 return LHS; 3200 } 3201 3202 return QualType(); 3203 } 3204 3205 // The canonical type classes match. 3206 switch (LHSClass) { 3207#define TYPE(Class, Base) 3208#define ABSTRACT_TYPE(Class, Base) 3209#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3210#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3211#include "clang/AST/TypeNodes.def" 3212 assert(false && "Non-canonical and dependent types shouldn't get here"); 3213 return QualType(); 3214 3215 case Type::LValueReference: 3216 case Type::RValueReference: 3217 case Type::MemberPointer: 3218 assert(false && "C++ should never be in mergeTypes"); 3219 return QualType(); 3220 3221 case Type::IncompleteArray: 3222 case Type::VariableArray: 3223 case Type::FunctionProto: 3224 case Type::ExtVector: 3225 case Type::ObjCQualifiedInterface: 3226 assert(false && "Types are eliminated above"); 3227 return QualType(); 3228 3229 case Type::Pointer: 3230 { 3231 // Merge two pointer types, while trying to preserve typedef info 3232 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 3233 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 3234 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3235 if (ResultType.isNull()) return QualType(); 3236 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3237 return LHS; 3238 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3239 return RHS; 3240 return getPointerType(ResultType); 3241 } 3242 case Type::BlockPointer: 3243 { 3244 // Merge two block pointer types, while trying to preserve typedef info 3245 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 3246 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 3247 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3248 if (ResultType.isNull()) return QualType(); 3249 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3250 return LHS; 3251 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3252 return RHS; 3253 return getBlockPointerType(ResultType); 3254 } 3255 case Type::ConstantArray: 3256 { 3257 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3258 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3259 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3260 return QualType(); 3261 3262 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3263 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3264 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3265 if (ResultType.isNull()) return QualType(); 3266 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3267 return LHS; 3268 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3269 return RHS; 3270 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3271 ArrayType::ArraySizeModifier(), 0); 3272 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3273 ArrayType::ArraySizeModifier(), 0); 3274 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3275 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3276 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3277 return LHS; 3278 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3279 return RHS; 3280 if (LVAT) { 3281 // FIXME: This isn't correct! But tricky to implement because 3282 // the array's size has to be the size of LHS, but the type 3283 // has to be different. 3284 return LHS; 3285 } 3286 if (RVAT) { 3287 // FIXME: This isn't correct! But tricky to implement because 3288 // the array's size has to be the size of RHS, but the type 3289 // has to be different. 3290 return RHS; 3291 } 3292 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3293 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3294 return getIncompleteArrayType(ResultType, ArrayType::ArraySizeModifier(),0); 3295 } 3296 case Type::FunctionNoProto: 3297 return mergeFunctionTypes(LHS, RHS); 3298 case Type::Record: 3299 case Type::Enum: 3300 // FIXME: Why are these compatible? 3301 if (isObjCIdStructType(LHS) && isObjCClassStructType(RHS)) return LHS; 3302 if (isObjCClassStructType(LHS) && isObjCIdStructType(RHS)) return LHS; 3303 return QualType(); 3304 case Type::Builtin: 3305 // Only exactly equal builtin types are compatible, which is tested above. 3306 return QualType(); 3307 case Type::Complex: 3308 // Distinct complex types are incompatible. 3309 return QualType(); 3310 case Type::Vector: 3311 // FIXME: The merged type should be an ExtVector! 3312 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3313 return LHS; 3314 return QualType(); 3315 case Type::ObjCInterface: { 3316 // Check if the interfaces are assignment compatible. 3317 // FIXME: This should be type compatibility, e.g. whether 3318 // "LHS x; RHS x;" at global scope is legal. 3319 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3320 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3321 if (LHSIface && RHSIface && 3322 canAssignObjCInterfaces(LHSIface, RHSIface)) 3323 return LHS; 3324 3325 return QualType(); 3326 } 3327 case Type::ObjCObjectPointer: 3328 // FIXME: finish 3329 // Distinct qualified id's are not compatible. 3330 return QualType(); 3331 case Type::FixedWidthInt: 3332 // Distinct fixed-width integers are not compatible. 3333 return QualType(); 3334 case Type::ExtQual: 3335 // FIXME: ExtQual types can be compatible even if they're not 3336 // identical! 3337 return QualType(); 3338 // First attempt at an implementation, but I'm not really sure it's 3339 // right... 3340#if 0 3341 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3342 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3343 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3344 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3345 return QualType(); 3346 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3347 LHSBase = QualType(LQual->getBaseType(), 0); 3348 RHSBase = QualType(RQual->getBaseType(), 0); 3349 ResultType = mergeTypes(LHSBase, RHSBase); 3350 if (ResultType.isNull()) return QualType(); 3351 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3352 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3353 return LHS; 3354 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3355 return RHS; 3356 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3357 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3358 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3359 return ResultType; 3360#endif 3361 3362 case Type::TemplateSpecialization: 3363 assert(false && "Dependent types have no size"); 3364 break; 3365 } 3366 3367 return QualType(); 3368} 3369 3370//===----------------------------------------------------------------------===// 3371// Integer Predicates 3372//===----------------------------------------------------------------------===// 3373 3374unsigned ASTContext::getIntWidth(QualType T) { 3375 if (T == BoolTy) 3376 return 1; 3377 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3378 return FWIT->getWidth(); 3379 } 3380 // For builtin types, just use the standard type sizing method 3381 return (unsigned)getTypeSize(T); 3382} 3383 3384QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3385 assert(T->isSignedIntegerType() && "Unexpected type"); 3386 if (const EnumType* ETy = T->getAsEnumType()) 3387 T = ETy->getDecl()->getIntegerType(); 3388 const BuiltinType* BTy = T->getAsBuiltinType(); 3389 assert (BTy && "Unexpected signed integer type"); 3390 switch (BTy->getKind()) { 3391 case BuiltinType::Char_S: 3392 case BuiltinType::SChar: 3393 return UnsignedCharTy; 3394 case BuiltinType::Short: 3395 return UnsignedShortTy; 3396 case BuiltinType::Int: 3397 return UnsignedIntTy; 3398 case BuiltinType::Long: 3399 return UnsignedLongTy; 3400 case BuiltinType::LongLong: 3401 return UnsignedLongLongTy; 3402 case BuiltinType::Int128: 3403 return UnsignedInt128Ty; 3404 default: 3405 assert(0 && "Unexpected signed integer type"); 3406 return QualType(); 3407 } 3408} 3409 3410ExternalASTSource::~ExternalASTSource() { } 3411 3412void ExternalASTSource::PrintStats() { } 3413 3414 3415//===----------------------------------------------------------------------===// 3416// Builtin Type Computation 3417//===----------------------------------------------------------------------===// 3418 3419/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3420/// pointer over the consumed characters. This returns the resultant type. 3421static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3422 ASTContext::GetBuiltinTypeError &Error, 3423 bool AllowTypeModifiers = true) { 3424 // Modifiers. 3425 int HowLong = 0; 3426 bool Signed = false, Unsigned = false; 3427 3428 // Read the modifiers first. 3429 bool Done = false; 3430 while (!Done) { 3431 switch (*Str++) { 3432 default: Done = true; --Str; break; 3433 case 'S': 3434 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3435 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3436 Signed = true; 3437 break; 3438 case 'U': 3439 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 3440 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 3441 Unsigned = true; 3442 break; 3443 case 'L': 3444 assert(HowLong <= 2 && "Can't have LLLL modifier"); 3445 ++HowLong; 3446 break; 3447 } 3448 } 3449 3450 QualType Type; 3451 3452 // Read the base type. 3453 switch (*Str++) { 3454 default: assert(0 && "Unknown builtin type letter!"); 3455 case 'v': 3456 assert(HowLong == 0 && !Signed && !Unsigned && 3457 "Bad modifiers used with 'v'!"); 3458 Type = Context.VoidTy; 3459 break; 3460 case 'f': 3461 assert(HowLong == 0 && !Signed && !Unsigned && 3462 "Bad modifiers used with 'f'!"); 3463 Type = Context.FloatTy; 3464 break; 3465 case 'd': 3466 assert(HowLong < 2 && !Signed && !Unsigned && 3467 "Bad modifiers used with 'd'!"); 3468 if (HowLong) 3469 Type = Context.LongDoubleTy; 3470 else 3471 Type = Context.DoubleTy; 3472 break; 3473 case 's': 3474 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 3475 if (Unsigned) 3476 Type = Context.UnsignedShortTy; 3477 else 3478 Type = Context.ShortTy; 3479 break; 3480 case 'i': 3481 if (HowLong == 3) 3482 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 3483 else if (HowLong == 2) 3484 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 3485 else if (HowLong == 1) 3486 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 3487 else 3488 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 3489 break; 3490 case 'c': 3491 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 3492 if (Signed) 3493 Type = Context.SignedCharTy; 3494 else if (Unsigned) 3495 Type = Context.UnsignedCharTy; 3496 else 3497 Type = Context.CharTy; 3498 break; 3499 case 'b': // boolean 3500 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 3501 Type = Context.BoolTy; 3502 break; 3503 case 'z': // size_t. 3504 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 3505 Type = Context.getSizeType(); 3506 break; 3507 case 'F': 3508 Type = Context.getCFConstantStringType(); 3509 break; 3510 case 'a': 3511 Type = Context.getBuiltinVaListType(); 3512 assert(!Type.isNull() && "builtin va list type not initialized!"); 3513 break; 3514 case 'A': 3515 // This is a "reference" to a va_list; however, what exactly 3516 // this means depends on how va_list is defined. There are two 3517 // different kinds of va_list: ones passed by value, and ones 3518 // passed by reference. An example of a by-value va_list is 3519 // x86, where va_list is a char*. An example of by-ref va_list 3520 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 3521 // we want this argument to be a char*&; for x86-64, we want 3522 // it to be a __va_list_tag*. 3523 Type = Context.getBuiltinVaListType(); 3524 assert(!Type.isNull() && "builtin va list type not initialized!"); 3525 if (Type->isArrayType()) { 3526 Type = Context.getArrayDecayedType(Type); 3527 } else { 3528 Type = Context.getLValueReferenceType(Type); 3529 } 3530 break; 3531 case 'V': { 3532 char *End; 3533 3534 unsigned NumElements = strtoul(Str, &End, 10); 3535 assert(End != Str && "Missing vector size"); 3536 3537 Str = End; 3538 3539 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 3540 Type = Context.getVectorType(ElementType, NumElements); 3541 break; 3542 } 3543 case 'P': { 3544 IdentifierInfo *II = &Context.Idents.get("FILE"); 3545 DeclContext::lookup_result Lookup 3546 = Context.getTranslationUnitDecl()->lookup(Context, II); 3547 if (Lookup.first != Lookup.second && isa<TypeDecl>(*Lookup.first)) { 3548 Type = Context.getTypeDeclType(cast<TypeDecl>(*Lookup.first)); 3549 break; 3550 } 3551 else { 3552 Error = ASTContext::GE_Missing_FILE; 3553 return QualType(); 3554 } 3555 } 3556 } 3557 3558 if (!AllowTypeModifiers) 3559 return Type; 3560 3561 Done = false; 3562 while (!Done) { 3563 switch (*Str++) { 3564 default: Done = true; --Str; break; 3565 case '*': 3566 Type = Context.getPointerType(Type); 3567 break; 3568 case '&': 3569 Type = Context.getLValueReferenceType(Type); 3570 break; 3571 // FIXME: There's no way to have a built-in with an rvalue ref arg. 3572 case 'C': 3573 Type = Type.getQualifiedType(QualType::Const); 3574 break; 3575 } 3576 } 3577 3578 return Type; 3579} 3580 3581/// GetBuiltinType - Return the type for the specified builtin. 3582QualType ASTContext::GetBuiltinType(unsigned id, 3583 GetBuiltinTypeError &Error) { 3584 const char *TypeStr = BuiltinInfo.GetTypeString(id); 3585 3586 llvm::SmallVector<QualType, 8> ArgTypes; 3587 3588 Error = GE_None; 3589 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 3590 if (Error != GE_None) 3591 return QualType(); 3592 while (TypeStr[0] && TypeStr[0] != '.') { 3593 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 3594 if (Error != GE_None) 3595 return QualType(); 3596 3597 // Do array -> pointer decay. The builtin should use the decayed type. 3598 if (Ty->isArrayType()) 3599 Ty = getArrayDecayedType(Ty); 3600 3601 ArgTypes.push_back(Ty); 3602 } 3603 3604 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 3605 "'.' should only occur at end of builtin type list!"); 3606 3607 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 3608 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 3609 return getFunctionNoProtoType(ResType); 3610 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 3611 TypeStr[0] == '.', 0); 3612} 3613