ASTContext.cpp revision dd0257c77719a13d4acd513df40b04300cbfc871
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), FILEDecl(0), 40 SourceMgr(SM), LangOpts(LOpts), 41 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 42 Idents(idents), Selectors(sels), 43 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 44 if (size_reserve > 0) Types.reserve(size_reserve); 45 InitBuiltinTypes(); 46 TUDecl = TranslationUnitDecl::Create(*this); 47} 48 49ASTContext::~ASTContext() { 50 // Deallocate all the types. 51 while (!Types.empty()) { 52 Types.back()->Destroy(*this); 53 Types.pop_back(); 54 } 55 56 { 57 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 58 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 59 while (I != E) { 60 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 61 delete R; 62 } 63 } 64 65 { 66 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 67 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 68 while (I != E) { 69 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 70 delete R; 71 } 72 } 73 74 // Destroy nested-name-specifiers. 75 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 76 NNS = NestedNameSpecifiers.begin(), 77 NNSEnd = NestedNameSpecifiers.end(); 78 NNS != NNSEnd; 79 /* Increment in loop */) 80 (*NNS++).Destroy(*this); 81 82 if (GlobalNestedNameSpecifier) 83 GlobalNestedNameSpecifier->Destroy(*this); 84 85 TUDecl->Destroy(*this); 86} 87 88void 89ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 90 ExternalSource.reset(Source.take()); 91} 92 93void ASTContext::PrintStats() const { 94 fprintf(stderr, "*** AST Context Stats:\n"); 95 fprintf(stderr, " %d types total.\n", (int)Types.size()); 96 97 unsigned counts[] = { 98#define TYPE(Name, Parent) 0, 99#define ABSTRACT_TYPE(Name, Parent) 100#include "clang/AST/TypeNodes.def" 101 0 // Extra 102 }; 103 104 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 105 Type *T = Types[i]; 106 counts[(unsigned)T->getTypeClass()]++; 107 } 108 109 unsigned Idx = 0; 110 unsigned TotalBytes = 0; 111#define TYPE(Name, Parent) \ 112 if (counts[Idx]) \ 113 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 114 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 115 ++Idx; 116#define ABSTRACT_TYPE(Name, Parent) 117#include "clang/AST/TypeNodes.def" 118 119 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 120 121 if (ExternalSource.get()) { 122 fprintf(stderr, "\n"); 123 ExternalSource->PrintStats(); 124 } 125} 126 127 128void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 129 Types.push_back((R = QualType(new (*this,8) BuiltinType(K),0)).getTypePtr()); 130} 131 132void ASTContext::InitBuiltinTypes() { 133 assert(VoidTy.isNull() && "Context reinitialized?"); 134 135 // C99 6.2.5p19. 136 InitBuiltinType(VoidTy, BuiltinType::Void); 137 138 // C99 6.2.5p2. 139 InitBuiltinType(BoolTy, BuiltinType::Bool); 140 // C99 6.2.5p3. 141 if (LangOpts.CharIsSigned) 142 InitBuiltinType(CharTy, BuiltinType::Char_S); 143 else 144 InitBuiltinType(CharTy, BuiltinType::Char_U); 145 // C99 6.2.5p4. 146 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 147 InitBuiltinType(ShortTy, BuiltinType::Short); 148 InitBuiltinType(IntTy, BuiltinType::Int); 149 InitBuiltinType(LongTy, BuiltinType::Long); 150 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 151 152 // C99 6.2.5p6. 153 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 154 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 155 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 156 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 157 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 158 159 // C99 6.2.5p10. 160 InitBuiltinType(FloatTy, BuiltinType::Float); 161 InitBuiltinType(DoubleTy, BuiltinType::Double); 162 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 163 164 // GNU extension, 128-bit integers. 165 InitBuiltinType(Int128Ty, BuiltinType::Int128); 166 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 167 168 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 169 InitBuiltinType(WCharTy, BuiltinType::WChar); 170 else // C99 171 WCharTy = getFromTargetType(Target.getWCharType()); 172 173 // Placeholder type for functions. 174 InitBuiltinType(OverloadTy, BuiltinType::Overload); 175 176 // Placeholder type for type-dependent expressions whose type is 177 // completely unknown. No code should ever check a type against 178 // DependentTy and users should never see it; however, it is here to 179 // help diagnose failures to properly check for type-dependent 180 // expressions. 181 InitBuiltinType(DependentTy, BuiltinType::Dependent); 182 183 // Placeholder type for C++0x auto declarations whose real type has 184 // not yet been deduced. 185 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 186 187 // C99 6.2.5p11. 188 FloatComplexTy = getComplexType(FloatTy); 189 DoubleComplexTy = getComplexType(DoubleTy); 190 LongDoubleComplexTy = getComplexType(LongDoubleTy); 191 192 BuiltinVaListType = QualType(); 193 ObjCIdType = QualType(); 194 IdStructType = 0; 195 ObjCClassType = QualType(); 196 ClassStructType = 0; 197 198 ObjCConstantStringType = QualType(); 199 200 // void * type 201 VoidPtrTy = getPointerType(VoidTy); 202 203 // nullptr type (C++0x 2.14.7) 204 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 205} 206 207namespace { 208 class BeforeInTranslationUnit 209 : std::binary_function<SourceRange, SourceRange, bool> { 210 SourceManager *SourceMgr; 211 212 public: 213 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 214 215 bool operator()(SourceRange X, SourceRange Y) { 216 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 217 } 218 }; 219} 220 221/// \brief Determine whether the given comment is a Doxygen-style comment. 222/// 223/// \param Start the start of the comment text. 224/// 225/// \param End the end of the comment text. 226/// 227/// \param Member whether we want to check whether this is a member comment 228/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 229/// we only return true when we find a non-member comment. 230static bool 231isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 232 bool Member = false) { 233 const char *BufferStart 234 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 235 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 236 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 237 238 if (End - Start < 4) 239 return false; 240 241 assert(Start[0] == '/' && "Not a comment?"); 242 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 243 return false; 244 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 245 return false; 246 247 return (Start[3] == '<') == Member; 248} 249 250/// \brief Retrieve the comment associated with the given declaration, if 251/// it has one. 252const char *ASTContext::getCommentForDecl(const Decl *D) { 253 if (!D) 254 return 0; 255 256 // Check whether we have cached a comment string for this declaration 257 // already. 258 llvm::DenseMap<const Decl *, std::string>::iterator Pos 259 = DeclComments.find(D); 260 if (Pos != DeclComments.end()) 261 return Pos->second.c_str(); 262 263 // If we have an external AST source and have not yet loaded comments from 264 // that source, do so now. 265 if (ExternalSource && !LoadedExternalComments) { 266 std::vector<SourceRange> LoadedComments; 267 ExternalSource->ReadComments(LoadedComments); 268 269 if (!LoadedComments.empty()) 270 Comments.insert(Comments.begin(), LoadedComments.begin(), 271 LoadedComments.end()); 272 273 LoadedExternalComments = true; 274 } 275 276 // If there are no comments anywhere, we won't find anything. 277 if (Comments.empty()) 278 return 0; 279 280 // If the declaration doesn't map directly to a location in a file, we 281 // can't find the comment. 282 SourceLocation DeclStartLoc = D->getLocStart(); 283 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 284 return 0; 285 286 // Find the comment that occurs just before this declaration. 287 std::vector<SourceRange>::iterator LastComment 288 = std::lower_bound(Comments.begin(), Comments.end(), 289 SourceRange(DeclStartLoc), 290 BeforeInTranslationUnit(&SourceMgr)); 291 292 // Decompose the location for the start of the declaration and find the 293 // beginning of the file buffer. 294 std::pair<FileID, unsigned> DeclStartDecomp 295 = SourceMgr.getDecomposedLoc(DeclStartLoc); 296 const char *FileBufferStart 297 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 298 299 // First check whether we have a comment for a member. 300 if (LastComment != Comments.end() && 301 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 302 isDoxygenComment(SourceMgr, *LastComment, true)) { 303 std::pair<FileID, unsigned> LastCommentEndDecomp 304 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 305 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 306 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 307 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 308 LastCommentEndDecomp.second)) { 309 // The Doxygen member comment comes after the declaration starts and 310 // is on the same line and in the same file as the declaration. This 311 // is the comment we want. 312 std::string &Result = DeclComments[D]; 313 Result.append(FileBufferStart + 314 SourceMgr.getFileOffset(LastComment->getBegin()), 315 FileBufferStart + LastCommentEndDecomp.second + 1); 316 return Result.c_str(); 317 } 318 } 319 320 if (LastComment == Comments.begin()) 321 return 0; 322 --LastComment; 323 324 // Decompose the end of the comment. 325 std::pair<FileID, unsigned> LastCommentEndDecomp 326 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 327 328 // If the comment and the declaration aren't in the same file, then they 329 // aren't related. 330 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 331 return 0; 332 333 // Check that we actually have a Doxygen comment. 334 if (!isDoxygenComment(SourceMgr, *LastComment)) 335 return 0; 336 337 // Compute the starting line for the declaration and for the end of the 338 // comment (this is expensive). 339 unsigned DeclStartLine 340 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 341 unsigned CommentEndLine 342 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 343 LastCommentEndDecomp.second); 344 345 // If the comment does not end on the line prior to the declaration, then 346 // the comment is not associated with the declaration at all. 347 if (CommentEndLine + 1 != DeclStartLine) 348 return 0; 349 350 // We have a comment, but there may be more comments on the previous lines. 351 // Keep looking so long as the comments are still Doxygen comments and are 352 // still adjacent. 353 unsigned ExpectedLine 354 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 355 std::vector<SourceRange>::iterator FirstComment = LastComment; 356 while (FirstComment != Comments.begin()) { 357 // Look at the previous comment 358 --FirstComment; 359 std::pair<FileID, unsigned> Decomp 360 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 361 362 // If this previous comment is in a different file, we're done. 363 if (Decomp.first != DeclStartDecomp.first) { 364 ++FirstComment; 365 break; 366 } 367 368 // If this comment is not a Doxygen comment, we're done. 369 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 370 ++FirstComment; 371 break; 372 } 373 374 // If the line number is not what we expected, we're done. 375 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 376 if (Line != ExpectedLine) { 377 ++FirstComment; 378 break; 379 } 380 381 // Set the next expected line number. 382 ExpectedLine 383 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 384 } 385 386 // The iterator range [FirstComment, LastComment] contains all of the 387 // BCPL comments that, together, are associated with this declaration. 388 // Form a single comment block string for this declaration that concatenates 389 // all of these comments. 390 std::string &Result = DeclComments[D]; 391 while (FirstComment != LastComment) { 392 std::pair<FileID, unsigned> DecompStart 393 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 394 std::pair<FileID, unsigned> DecompEnd 395 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 396 Result.append(FileBufferStart + DecompStart.second, 397 FileBufferStart + DecompEnd.second + 1); 398 ++FirstComment; 399 } 400 401 // Append the last comment line. 402 Result.append(FileBufferStart + 403 SourceMgr.getFileOffset(LastComment->getBegin()), 404 FileBufferStart + LastCommentEndDecomp.second + 1); 405 return Result.c_str(); 406} 407 408//===----------------------------------------------------------------------===// 409// Type Sizing and Analysis 410//===----------------------------------------------------------------------===// 411 412/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 413/// scalar floating point type. 414const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 415 const BuiltinType *BT = T->getAsBuiltinType(); 416 assert(BT && "Not a floating point type!"); 417 switch (BT->getKind()) { 418 default: assert(0 && "Not a floating point type!"); 419 case BuiltinType::Float: return Target.getFloatFormat(); 420 case BuiltinType::Double: return Target.getDoubleFormat(); 421 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 422 } 423} 424 425/// getDeclAlign - Return a conservative estimate of the alignment of the 426/// specified decl. Note that bitfields do not have a valid alignment, so 427/// this method will assert on them. 428unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 429 unsigned Align = Target.getCharWidth(); 430 431 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 432 Align = std::max(Align, AA->getAlignment()); 433 434 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 435 QualType T = VD->getType(); 436 if (const ReferenceType* RT = T->getAsReferenceType()) { 437 unsigned AS = RT->getPointeeType().getAddressSpace(); 438 Align = Target.getPointerAlign(AS); 439 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 440 // Incomplete or function types default to 1. 441 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 442 T = cast<ArrayType>(T)->getElementType(); 443 444 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 445 } 446 } 447 448 return Align / Target.getCharWidth(); 449} 450 451/// getTypeSize - Return the size of the specified type, in bits. This method 452/// does not work on incomplete types. 453std::pair<uint64_t, unsigned> 454ASTContext::getTypeInfo(const Type *T) { 455 uint64_t Width=0; 456 unsigned Align=8; 457 switch (T->getTypeClass()) { 458#define TYPE(Class, Base) 459#define ABSTRACT_TYPE(Class, Base) 460#define NON_CANONICAL_TYPE(Class, Base) 461#define DEPENDENT_TYPE(Class, Base) case Type::Class: 462#include "clang/AST/TypeNodes.def" 463 assert(false && "Should not see dependent types"); 464 break; 465 466 case Type::FunctionNoProto: 467 case Type::FunctionProto: 468 // GCC extension: alignof(function) = 32 bits 469 Width = 0; 470 Align = 32; 471 break; 472 473 case Type::IncompleteArray: 474 case Type::VariableArray: 475 Width = 0; 476 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 477 break; 478 479 case Type::ConstantArrayWithExpr: 480 case Type::ConstantArrayWithoutExpr: 481 case Type::ConstantArray: { 482 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 483 484 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 485 Width = EltInfo.first*CAT->getSize().getZExtValue(); 486 Align = EltInfo.second; 487 break; 488 } 489 case Type::ExtVector: 490 case Type::Vector: { 491 std::pair<uint64_t, unsigned> EltInfo = 492 getTypeInfo(cast<VectorType>(T)->getElementType()); 493 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 494 Align = Width; 495 // If the alignment is not a power of 2, round up to the next power of 2. 496 // This happens for non-power-of-2 length vectors. 497 // FIXME: this should probably be a target property. 498 Align = 1 << llvm::Log2_32_Ceil(Align); 499 break; 500 } 501 502 case Type::Builtin: 503 switch (cast<BuiltinType>(T)->getKind()) { 504 default: assert(0 && "Unknown builtin type!"); 505 case BuiltinType::Void: 506 // GCC extension: alignof(void) = 8 bits. 507 Width = 0; 508 Align = 8; 509 break; 510 511 case BuiltinType::Bool: 512 Width = Target.getBoolWidth(); 513 Align = Target.getBoolAlign(); 514 break; 515 case BuiltinType::Char_S: 516 case BuiltinType::Char_U: 517 case BuiltinType::UChar: 518 case BuiltinType::SChar: 519 Width = Target.getCharWidth(); 520 Align = Target.getCharAlign(); 521 break; 522 case BuiltinType::WChar: 523 Width = Target.getWCharWidth(); 524 Align = Target.getWCharAlign(); 525 break; 526 case BuiltinType::UShort: 527 case BuiltinType::Short: 528 Width = Target.getShortWidth(); 529 Align = Target.getShortAlign(); 530 break; 531 case BuiltinType::UInt: 532 case BuiltinType::Int: 533 Width = Target.getIntWidth(); 534 Align = Target.getIntAlign(); 535 break; 536 case BuiltinType::ULong: 537 case BuiltinType::Long: 538 Width = Target.getLongWidth(); 539 Align = Target.getLongAlign(); 540 break; 541 case BuiltinType::ULongLong: 542 case BuiltinType::LongLong: 543 Width = Target.getLongLongWidth(); 544 Align = Target.getLongLongAlign(); 545 break; 546 case BuiltinType::Int128: 547 case BuiltinType::UInt128: 548 Width = 128; 549 Align = 128; // int128_t is 128-bit aligned on all targets. 550 break; 551 case BuiltinType::Float: 552 Width = Target.getFloatWidth(); 553 Align = Target.getFloatAlign(); 554 break; 555 case BuiltinType::Double: 556 Width = Target.getDoubleWidth(); 557 Align = Target.getDoubleAlign(); 558 break; 559 case BuiltinType::LongDouble: 560 Width = Target.getLongDoubleWidth(); 561 Align = Target.getLongDoubleAlign(); 562 break; 563 case BuiltinType::NullPtr: 564 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 565 Align = Target.getPointerAlign(0); // == sizeof(void*) 566 break; 567 } 568 break; 569 case Type::FixedWidthInt: 570 // FIXME: This isn't precisely correct; the width/alignment should depend 571 // on the available types for the target 572 Width = cast<FixedWidthIntType>(T)->getWidth(); 573 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 574 Align = Width; 575 break; 576 case Type::ExtQual: 577 // FIXME: Pointers into different addr spaces could have different sizes and 578 // alignment requirements: getPointerInfo should take an AddrSpace. 579 return getTypeInfo(QualType(cast<ExtQualType>(T)->getBaseType(), 0)); 580 case Type::ObjCObjectPointer: 581 case Type::ObjCQualifiedInterface: 582 Width = Target.getPointerWidth(0); 583 Align = Target.getPointerAlign(0); 584 break; 585 case Type::BlockPointer: { 586 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 587 Width = Target.getPointerWidth(AS); 588 Align = Target.getPointerAlign(AS); 589 break; 590 } 591 case Type::Pointer: { 592 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 593 Width = Target.getPointerWidth(AS); 594 Align = Target.getPointerAlign(AS); 595 break; 596 } 597 case Type::LValueReference: 598 case Type::RValueReference: 599 // "When applied to a reference or a reference type, the result is the size 600 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 601 // FIXME: This is wrong for struct layout: a reference in a struct has 602 // pointer size. 603 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 604 case Type::MemberPointer: { 605 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 606 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 607 // If we ever want to support other ABIs this needs to be abstracted. 608 609 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 610 std::pair<uint64_t, unsigned> PtrDiffInfo = 611 getTypeInfo(getPointerDiffType()); 612 Width = PtrDiffInfo.first; 613 if (Pointee->isFunctionType()) 614 Width *= 2; 615 Align = PtrDiffInfo.second; 616 break; 617 } 618 case Type::Complex: { 619 // Complex types have the same alignment as their elements, but twice the 620 // size. 621 std::pair<uint64_t, unsigned> EltInfo = 622 getTypeInfo(cast<ComplexType>(T)->getElementType()); 623 Width = EltInfo.first*2; 624 Align = EltInfo.second; 625 break; 626 } 627 case Type::ObjCInterface: { 628 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 629 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 630 Width = Layout.getSize(); 631 Align = Layout.getAlignment(); 632 break; 633 } 634 case Type::Record: 635 case Type::Enum: { 636 const TagType *TT = cast<TagType>(T); 637 638 if (TT->getDecl()->isInvalidDecl()) { 639 Width = 1; 640 Align = 1; 641 break; 642 } 643 644 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 645 return getTypeInfo(ET->getDecl()->getIntegerType()); 646 647 const RecordType *RT = cast<RecordType>(TT); 648 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 649 Width = Layout.getSize(); 650 Align = Layout.getAlignment(); 651 break; 652 } 653 654 case Type::Typedef: { 655 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 656 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 657 Align = Aligned->getAlignment(); 658 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 659 } else 660 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 661 break; 662 } 663 664 case Type::TypeOfExpr: 665 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 666 .getTypePtr()); 667 668 case Type::TypeOf: 669 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 670 671 case Type::Decltype: 672 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 673 .getTypePtr()); 674 675 case Type::QualifiedName: 676 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 677 678 case Type::TemplateSpecialization: 679 assert(getCanonicalType(T) != T && 680 "Cannot request the size of a dependent type"); 681 // FIXME: this is likely to be wrong once we support template 682 // aliases, since a template alias could refer to a typedef that 683 // has an __aligned__ attribute on it. 684 return getTypeInfo(getCanonicalType(T)); 685 } 686 687 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 688 return std::make_pair(Width, Align); 689} 690 691/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 692/// type for the current target in bits. This can be different than the ABI 693/// alignment in cases where it is beneficial for performance to overalign 694/// a data type. 695unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 696 unsigned ABIAlign = getTypeAlign(T); 697 698 // Double and long long should be naturally aligned if possible. 699 if (const ComplexType* CT = T->getAsComplexType()) 700 T = CT->getElementType().getTypePtr(); 701 if (T->isSpecificBuiltinType(BuiltinType::Double) || 702 T->isSpecificBuiltinType(BuiltinType::LongLong)) 703 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 704 705 return ABIAlign; 706} 707 708 709/// LayoutField - Field layout. 710void ASTRecordLayout::LayoutField(const FieldDecl *FD, unsigned FieldNo, 711 bool IsUnion, unsigned StructPacking, 712 ASTContext &Context) { 713 unsigned FieldPacking = StructPacking; 714 uint64_t FieldOffset = IsUnion ? 0 : Size; 715 uint64_t FieldSize; 716 unsigned FieldAlign; 717 718 // FIXME: Should this override struct packing? Probably we want to 719 // take the minimum? 720 if (const PackedAttr *PA = FD->getAttr<PackedAttr>()) 721 FieldPacking = PA->getAlignment(); 722 723 if (const Expr *BitWidthExpr = FD->getBitWidth()) { 724 // TODO: Need to check this algorithm on other targets! 725 // (tested on Linux-X86) 726 FieldSize = BitWidthExpr->EvaluateAsInt(Context).getZExtValue(); 727 728 std::pair<uint64_t, unsigned> FieldInfo = 729 Context.getTypeInfo(FD->getType()); 730 uint64_t TypeSize = FieldInfo.first; 731 732 // Determine the alignment of this bitfield. The packing 733 // attributes define a maximum and the alignment attribute defines 734 // a minimum. 735 // FIXME: What is the right behavior when the specified alignment 736 // is smaller than the specified packing? 737 FieldAlign = FieldInfo.second; 738 if (FieldPacking) 739 FieldAlign = std::min(FieldAlign, FieldPacking); 740 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 741 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 742 743 // Check if we need to add padding to give the field the correct 744 // alignment. 745 if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize) 746 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 747 748 // Padding members don't affect overall alignment 749 if (!FD->getIdentifier()) 750 FieldAlign = 1; 751 } else { 752 if (FD->getType()->isIncompleteArrayType()) { 753 // This is a flexible array member; we can't directly 754 // query getTypeInfo about these, so we figure it out here. 755 // Flexible array members don't have any size, but they 756 // have to be aligned appropriately for their element type. 757 FieldSize = 0; 758 const ArrayType* ATy = Context.getAsArrayType(FD->getType()); 759 FieldAlign = Context.getTypeAlign(ATy->getElementType()); 760 } else if (const ReferenceType *RT = FD->getType()->getAsReferenceType()) { 761 unsigned AS = RT->getPointeeType().getAddressSpace(); 762 FieldSize = Context.Target.getPointerWidth(AS); 763 FieldAlign = Context.Target.getPointerAlign(AS); 764 } else { 765 std::pair<uint64_t, unsigned> FieldInfo = 766 Context.getTypeInfo(FD->getType()); 767 FieldSize = FieldInfo.first; 768 FieldAlign = FieldInfo.second; 769 } 770 771 // Determine the alignment of this bitfield. The packing 772 // attributes define a maximum and the alignment attribute defines 773 // a minimum. Additionally, the packing alignment must be at least 774 // a byte for non-bitfields. 775 // 776 // FIXME: What is the right behavior when the specified alignment 777 // is smaller than the specified packing? 778 if (FieldPacking) 779 FieldAlign = std::min(FieldAlign, std::max(8U, FieldPacking)); 780 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 781 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 782 783 // Round up the current record size to the field's alignment boundary. 784 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 785 } 786 787 // Place this field at the current location. 788 FieldOffsets[FieldNo] = FieldOffset; 789 790 // Reserve space for this field. 791 if (IsUnion) { 792 Size = std::max(Size, FieldSize); 793 } else { 794 Size = FieldOffset + FieldSize; 795 } 796 797 // Remember the next available offset. 798 NextOffset = Size; 799 800 // Remember max struct/class alignment. 801 Alignment = std::max(Alignment, FieldAlign); 802} 803 804static void CollectLocalObjCIvars(ASTContext *Ctx, 805 const ObjCInterfaceDecl *OI, 806 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 807 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 808 E = OI->ivar_end(); I != E; ++I) { 809 ObjCIvarDecl *IVDecl = *I; 810 if (!IVDecl->isInvalidDecl()) 811 Fields.push_back(cast<FieldDecl>(IVDecl)); 812 } 813} 814 815void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 816 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 817 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 818 CollectObjCIvars(SuperClass, Fields); 819 CollectLocalObjCIvars(this, OI, Fields); 820} 821 822/// ShallowCollectObjCIvars - 823/// Collect all ivars, including those synthesized, in the current class. 824/// 825void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 826 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 827 bool CollectSynthesized) { 828 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 829 E = OI->ivar_end(); I != E; ++I) { 830 Ivars.push_back(*I); 831 } 832 if (CollectSynthesized) 833 CollectSynthesizedIvars(OI, Ivars); 834} 835 836void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 837 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 838 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 839 E = PD->prop_end(); I != E; ++I) 840 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 841 Ivars.push_back(Ivar); 842 843 // Also look into nested protocols. 844 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 845 E = PD->protocol_end(); P != E; ++P) 846 CollectProtocolSynthesizedIvars(*P, Ivars); 847} 848 849/// CollectSynthesizedIvars - 850/// This routine collect synthesized ivars for the designated class. 851/// 852void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 853 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 854 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 855 E = OI->prop_end(); I != E; ++I) { 856 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 857 Ivars.push_back(Ivar); 858 } 859 // Also look into interface's protocol list for properties declared 860 // in the protocol and whose ivars are synthesized. 861 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 862 PE = OI->protocol_end(); P != PE; ++P) { 863 ObjCProtocolDecl *PD = (*P); 864 CollectProtocolSynthesizedIvars(PD, Ivars); 865 } 866} 867 868unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 869 unsigned count = 0; 870 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 871 E = PD->prop_end(); I != E; ++I) 872 if ((*I)->getPropertyIvarDecl()) 873 ++count; 874 875 // Also look into nested protocols. 876 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 877 E = PD->protocol_end(); P != E; ++P) 878 count += CountProtocolSynthesizedIvars(*P); 879 return count; 880} 881 882unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) 883{ 884 unsigned count = 0; 885 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 886 E = OI->prop_end(); I != E; ++I) { 887 if ((*I)->getPropertyIvarDecl()) 888 ++count; 889 } 890 // Also look into interface's protocol list for properties declared 891 // in the protocol and whose ivars are synthesized. 892 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 893 PE = OI->protocol_end(); P != PE; ++P) { 894 ObjCProtocolDecl *PD = (*P); 895 count += CountProtocolSynthesizedIvars(PD); 896 } 897 return count; 898} 899 900/// getInterfaceLayoutImpl - Get or compute information about the 901/// layout of the given interface. 902/// 903/// \param Impl - If given, also include the layout of the interface's 904/// implementation. This may differ by including synthesized ivars. 905const ASTRecordLayout & 906ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 907 const ObjCImplementationDecl *Impl) { 908 assert(!D->isForwardDecl() && "Invalid interface decl!"); 909 910 // Look up this layout, if already laid out, return what we have. 911 ObjCContainerDecl *Key = 912 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 913 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 914 return *Entry; 915 916 unsigned FieldCount = D->ivar_size(); 917 // Add in synthesized ivar count if laying out an implementation. 918 if (Impl) { 919 unsigned SynthCount = CountSynthesizedIvars(D); 920 FieldCount += SynthCount; 921 // If there aren't any sythesized ivars then reuse the interface 922 // entry. Note we can't cache this because we simply free all 923 // entries later; however we shouldn't look up implementations 924 // frequently. 925 if (SynthCount == 0) 926 return getObjCLayout(D, 0); 927 } 928 929 ASTRecordLayout *NewEntry = NULL; 930 if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 931 const ASTRecordLayout &SL = getASTObjCInterfaceLayout(SD); 932 unsigned Alignment = SL.getAlignment(); 933 934 // We start laying out ivars not at the end of the superclass 935 // structure, but at the next byte following the last field. 936 uint64_t Size = llvm::RoundUpToAlignment(SL.NextOffset, 8); 937 938 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(Size, Alignment); 939 NewEntry->InitializeLayout(FieldCount); 940 } else { 941 ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(); 942 NewEntry->InitializeLayout(FieldCount); 943 } 944 945 unsigned StructPacking = 0; 946 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 947 StructPacking = PA->getAlignment(); 948 949 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 950 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 951 AA->getAlignment())); 952 953 // Layout each ivar sequentially. 954 unsigned i = 0; 955 llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; 956 ShallowCollectObjCIvars(D, Ivars, Impl); 957 for (unsigned k = 0, e = Ivars.size(); k != e; ++k) 958 NewEntry->LayoutField(Ivars[k], i++, false, StructPacking, *this); 959 960 // Finally, round the size of the total struct up to the alignment of the 961 // struct itself. 962 NewEntry->FinalizeLayout(); 963 return *NewEntry; 964} 965 966const ASTRecordLayout & 967ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 968 return getObjCLayout(D, 0); 969} 970 971const ASTRecordLayout & 972ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 973 return getObjCLayout(D->getClassInterface(), D); 974} 975 976/// getASTRecordLayout - Get or compute information about the layout of the 977/// specified record (struct/union/class), which indicates its size and field 978/// position information. 979const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 980 D = D->getDefinition(*this); 981 assert(D && "Cannot get layout of forward declarations!"); 982 983 // Look up this layout, if already laid out, return what we have. 984 const ASTRecordLayout *&Entry = ASTRecordLayouts[D]; 985 if (Entry) return *Entry; 986 987 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 988 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 989 ASTRecordLayout *NewEntry = new ASTRecordLayout(); 990 Entry = NewEntry; 991 992 // FIXME: Avoid linear walk through the fields, if possible. 993 NewEntry->InitializeLayout(std::distance(D->field_begin(), D->field_end())); 994 bool IsUnion = D->isUnion(); 995 996 unsigned StructPacking = 0; 997 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 998 StructPacking = PA->getAlignment(); 999 1000 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 1001 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 1002 AA->getAlignment())); 1003 1004 // Layout each field, for now, just sequentially, respecting alignment. In 1005 // the future, this will need to be tweakable by targets. 1006 unsigned FieldIdx = 0; 1007 for (RecordDecl::field_iterator Field = D->field_begin(), 1008 FieldEnd = D->field_end(); 1009 Field != FieldEnd; (void)++Field, ++FieldIdx) 1010 NewEntry->LayoutField(*Field, FieldIdx, IsUnion, StructPacking, *this); 1011 1012 // Finally, round the size of the total struct up to the alignment of the 1013 // struct itself. 1014 NewEntry->FinalizeLayout(getLangOptions().CPlusPlus); 1015 return *NewEntry; 1016} 1017 1018//===----------------------------------------------------------------------===// 1019// Type creation/memoization methods 1020//===----------------------------------------------------------------------===// 1021 1022QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1023 QualType CanT = getCanonicalType(T); 1024 if (CanT.getAddressSpace() == AddressSpace) 1025 return T; 1026 1027 // If we are composing extended qualifiers together, merge together into one 1028 // ExtQualType node. 1029 unsigned CVRQuals = T.getCVRQualifiers(); 1030 QualType::GCAttrTypes GCAttr = QualType::GCNone; 1031 Type *TypeNode = T.getTypePtr(); 1032 1033 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 1034 // If this type already has an address space specified, it cannot get 1035 // another one. 1036 assert(EQT->getAddressSpace() == 0 && 1037 "Type cannot be in multiple addr spaces!"); 1038 GCAttr = EQT->getObjCGCAttr(); 1039 TypeNode = EQT->getBaseType(); 1040 } 1041 1042 // Check if we've already instantiated this type. 1043 llvm::FoldingSetNodeID ID; 1044 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 1045 void *InsertPos = 0; 1046 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 1047 return QualType(EXTQy, CVRQuals); 1048 1049 // If the base type isn't canonical, this won't be a canonical type either, 1050 // so fill in the canonical type field. 1051 QualType Canonical; 1052 if (!TypeNode->isCanonical()) { 1053 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 1054 1055 // Update InsertPos, the previous call could have invalidated it. 1056 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 1057 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1058 } 1059 ExtQualType *New = 1060 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 1061 ExtQualTypes.InsertNode(New, InsertPos); 1062 Types.push_back(New); 1063 return QualType(New, CVRQuals); 1064} 1065 1066QualType ASTContext::getObjCGCQualType(QualType T, 1067 QualType::GCAttrTypes GCAttr) { 1068 QualType CanT = getCanonicalType(T); 1069 if (CanT.getObjCGCAttr() == GCAttr) 1070 return T; 1071 1072 if (T->isPointerType()) { 1073 QualType Pointee = T->getAsPointerType()->getPointeeType(); 1074 if (Pointee->isPointerType()) { 1075 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1076 return getPointerType(ResultType); 1077 } 1078 } 1079 // If we are composing extended qualifiers together, merge together into one 1080 // ExtQualType node. 1081 unsigned CVRQuals = T.getCVRQualifiers(); 1082 Type *TypeNode = T.getTypePtr(); 1083 unsigned AddressSpace = 0; 1084 1085 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 1086 // If this type already has an address space specified, it cannot get 1087 // another one. 1088 assert(EQT->getObjCGCAttr() == QualType::GCNone && 1089 "Type cannot be in multiple addr spaces!"); 1090 AddressSpace = EQT->getAddressSpace(); 1091 TypeNode = EQT->getBaseType(); 1092 } 1093 1094 // Check if we've already instantiated an gc qual'd type of this type. 1095 llvm::FoldingSetNodeID ID; 1096 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 1097 void *InsertPos = 0; 1098 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 1099 return QualType(EXTQy, CVRQuals); 1100 1101 // If the base type isn't canonical, this won't be a canonical type either, 1102 // so fill in the canonical type field. 1103 // FIXME: Isn't this also not canonical if the base type is a array 1104 // or pointer type? I can't find any documentation for objc_gc, though... 1105 QualType Canonical; 1106 if (!T->isCanonical()) { 1107 Canonical = getObjCGCQualType(CanT, GCAttr); 1108 1109 // Update InsertPos, the previous call could have invalidated it. 1110 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 1111 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1112 } 1113 ExtQualType *New = 1114 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 1115 ExtQualTypes.InsertNode(New, InsertPos); 1116 Types.push_back(New); 1117 return QualType(New, CVRQuals); 1118} 1119 1120/// getComplexType - Return the uniqued reference to the type for a complex 1121/// number with the specified element type. 1122QualType ASTContext::getComplexType(QualType T) { 1123 // Unique pointers, to guarantee there is only one pointer of a particular 1124 // structure. 1125 llvm::FoldingSetNodeID ID; 1126 ComplexType::Profile(ID, T); 1127 1128 void *InsertPos = 0; 1129 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1130 return QualType(CT, 0); 1131 1132 // If the pointee type isn't canonical, this won't be a canonical type either, 1133 // so fill in the canonical type field. 1134 QualType Canonical; 1135 if (!T->isCanonical()) { 1136 Canonical = getComplexType(getCanonicalType(T)); 1137 1138 // Get the new insert position for the node we care about. 1139 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1140 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1141 } 1142 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 1143 Types.push_back(New); 1144 ComplexTypes.InsertNode(New, InsertPos); 1145 return QualType(New, 0); 1146} 1147 1148QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1149 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1150 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1151 FixedWidthIntType *&Entry = Map[Width]; 1152 if (!Entry) 1153 Entry = new FixedWidthIntType(Width, Signed); 1154 return QualType(Entry, 0); 1155} 1156 1157/// getPointerType - Return the uniqued reference to the type for a pointer to 1158/// the specified type. 1159QualType ASTContext::getPointerType(QualType T) { 1160 // Unique pointers, to guarantee there is only one pointer of a particular 1161 // structure. 1162 llvm::FoldingSetNodeID ID; 1163 PointerType::Profile(ID, T); 1164 1165 void *InsertPos = 0; 1166 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1167 return QualType(PT, 0); 1168 1169 // If the pointee type isn't canonical, this won't be a canonical type either, 1170 // so fill in the canonical type field. 1171 QualType Canonical; 1172 if (!T->isCanonical()) { 1173 Canonical = getPointerType(getCanonicalType(T)); 1174 1175 // Get the new insert position for the node we care about. 1176 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1177 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1178 } 1179 PointerType *New = new (*this,8) PointerType(T, Canonical); 1180 Types.push_back(New); 1181 PointerTypes.InsertNode(New, InsertPos); 1182 return QualType(New, 0); 1183} 1184 1185/// getBlockPointerType - Return the uniqued reference to the type for 1186/// a pointer to the specified block. 1187QualType ASTContext::getBlockPointerType(QualType T) { 1188 assert(T->isFunctionType() && "block of function types only"); 1189 // Unique pointers, to guarantee there is only one block of a particular 1190 // structure. 1191 llvm::FoldingSetNodeID ID; 1192 BlockPointerType::Profile(ID, T); 1193 1194 void *InsertPos = 0; 1195 if (BlockPointerType *PT = 1196 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1197 return QualType(PT, 0); 1198 1199 // If the block pointee type isn't canonical, this won't be a canonical 1200 // type either so fill in the canonical type field. 1201 QualType Canonical; 1202 if (!T->isCanonical()) { 1203 Canonical = getBlockPointerType(getCanonicalType(T)); 1204 1205 // Get the new insert position for the node we care about. 1206 BlockPointerType *NewIP = 1207 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1208 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1209 } 1210 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 1211 Types.push_back(New); 1212 BlockPointerTypes.InsertNode(New, InsertPos); 1213 return QualType(New, 0); 1214} 1215 1216/// getLValueReferenceType - Return the uniqued reference to the type for an 1217/// lvalue reference to the specified type. 1218QualType ASTContext::getLValueReferenceType(QualType T) { 1219 // Unique pointers, to guarantee there is only one pointer of a particular 1220 // structure. 1221 llvm::FoldingSetNodeID ID; 1222 ReferenceType::Profile(ID, T); 1223 1224 void *InsertPos = 0; 1225 if (LValueReferenceType *RT = 1226 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1227 return QualType(RT, 0); 1228 1229 // If the referencee type isn't canonical, this won't be a canonical type 1230 // either, so fill in the canonical type field. 1231 QualType Canonical; 1232 if (!T->isCanonical()) { 1233 Canonical = getLValueReferenceType(getCanonicalType(T)); 1234 1235 // Get the new insert position for the node we care about. 1236 LValueReferenceType *NewIP = 1237 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1238 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1239 } 1240 1241 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 1242 Types.push_back(New); 1243 LValueReferenceTypes.InsertNode(New, InsertPos); 1244 return QualType(New, 0); 1245} 1246 1247/// getRValueReferenceType - Return the uniqued reference to the type for an 1248/// rvalue reference to the specified type. 1249QualType ASTContext::getRValueReferenceType(QualType T) { 1250 // Unique pointers, to guarantee there is only one pointer of a particular 1251 // structure. 1252 llvm::FoldingSetNodeID ID; 1253 ReferenceType::Profile(ID, T); 1254 1255 void *InsertPos = 0; 1256 if (RValueReferenceType *RT = 1257 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1258 return QualType(RT, 0); 1259 1260 // If the referencee type isn't canonical, this won't be a canonical type 1261 // either, so fill in the canonical type field. 1262 QualType Canonical; 1263 if (!T->isCanonical()) { 1264 Canonical = getRValueReferenceType(getCanonicalType(T)); 1265 1266 // Get the new insert position for the node we care about. 1267 RValueReferenceType *NewIP = 1268 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1269 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1270 } 1271 1272 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 1273 Types.push_back(New); 1274 RValueReferenceTypes.InsertNode(New, InsertPos); 1275 return QualType(New, 0); 1276} 1277 1278/// getMemberPointerType - Return the uniqued reference to the type for a 1279/// member pointer to the specified type, in the specified class. 1280QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1281{ 1282 // Unique pointers, to guarantee there is only one pointer of a particular 1283 // structure. 1284 llvm::FoldingSetNodeID ID; 1285 MemberPointerType::Profile(ID, T, Cls); 1286 1287 void *InsertPos = 0; 1288 if (MemberPointerType *PT = 1289 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1290 return QualType(PT, 0); 1291 1292 // If the pointee or class type isn't canonical, this won't be a canonical 1293 // type either, so fill in the canonical type field. 1294 QualType Canonical; 1295 if (!T->isCanonical()) { 1296 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1297 1298 // Get the new insert position for the node we care about. 1299 MemberPointerType *NewIP = 1300 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1301 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1302 } 1303 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1304 Types.push_back(New); 1305 MemberPointerTypes.InsertNode(New, InsertPos); 1306 return QualType(New, 0); 1307} 1308 1309/// getConstantArrayType - Return the unique reference to the type for an 1310/// array of the specified element type. 1311QualType ASTContext::getConstantArrayType(QualType EltTy, 1312 const llvm::APInt &ArySizeIn, 1313 ArrayType::ArraySizeModifier ASM, 1314 unsigned EltTypeQuals) { 1315 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1316 "Constant array of VLAs is illegal!"); 1317 1318 // Convert the array size into a canonical width matching the pointer size for 1319 // the target. 1320 llvm::APInt ArySize(ArySizeIn); 1321 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1322 1323 llvm::FoldingSetNodeID ID; 1324 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1325 1326 void *InsertPos = 0; 1327 if (ConstantArrayType *ATP = 1328 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1329 return QualType(ATP, 0); 1330 1331 // If the element type isn't canonical, this won't be a canonical type either, 1332 // so fill in the canonical type field. 1333 QualType Canonical; 1334 if (!EltTy->isCanonical()) { 1335 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1336 ASM, EltTypeQuals); 1337 // Get the new insert position for the node we care about. 1338 ConstantArrayType *NewIP = 1339 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1340 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1341 } 1342 1343 ConstantArrayType *New = 1344 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1345 ConstantArrayTypes.InsertNode(New, InsertPos); 1346 Types.push_back(New); 1347 return QualType(New, 0); 1348} 1349 1350/// getConstantArrayWithExprType - Return a reference to the type for 1351/// an array of the specified element type. 1352QualType 1353ASTContext::getConstantArrayWithExprType(QualType EltTy, 1354 const llvm::APInt &ArySizeIn, 1355 Expr *ArySizeExpr, 1356 ArrayType::ArraySizeModifier ASM, 1357 unsigned EltTypeQuals, 1358 SourceRange Brackets) { 1359 // Convert the array size into a canonical width matching the pointer 1360 // size for the target. 1361 llvm::APInt ArySize(ArySizeIn); 1362 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1363 1364 // Compute the canonical ConstantArrayType. 1365 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1366 ArySize, ASM, EltTypeQuals); 1367 // Since we don't unique expressions, it isn't possible to unique VLA's 1368 // that have an expression provided for their size. 1369 ConstantArrayWithExprType *New = 1370 new(*this,8)ConstantArrayWithExprType(EltTy, Canonical, 1371 ArySize, ArySizeExpr, 1372 ASM, EltTypeQuals, Brackets); 1373 Types.push_back(New); 1374 return QualType(New, 0); 1375} 1376 1377/// getConstantArrayWithoutExprType - Return a reference to the type for 1378/// an array of the specified element type. 1379QualType 1380ASTContext::getConstantArrayWithoutExprType(QualType EltTy, 1381 const llvm::APInt &ArySizeIn, 1382 ArrayType::ArraySizeModifier ASM, 1383 unsigned EltTypeQuals) { 1384 // Convert the array size into a canonical width matching the pointer 1385 // size for the target. 1386 llvm::APInt ArySize(ArySizeIn); 1387 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1388 1389 // Compute the canonical ConstantArrayType. 1390 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1391 ArySize, ASM, EltTypeQuals); 1392 ConstantArrayWithoutExprType *New = 1393 new(*this,8)ConstantArrayWithoutExprType(EltTy, Canonical, 1394 ArySize, ASM, EltTypeQuals); 1395 Types.push_back(New); 1396 return QualType(New, 0); 1397} 1398 1399/// getVariableArrayType - Returns a non-unique reference to the type for a 1400/// variable array of the specified element type. 1401QualType ASTContext::getVariableArrayType(QualType EltTy, 1402 Expr *NumElts, 1403 ArrayType::ArraySizeModifier ASM, 1404 unsigned EltTypeQuals, 1405 SourceRange Brackets) { 1406 // Since we don't unique expressions, it isn't possible to unique VLA's 1407 // that have an expression provided for their size. 1408 1409 VariableArrayType *New = 1410 new(*this,8)VariableArrayType(EltTy, QualType(), 1411 NumElts, ASM, EltTypeQuals, Brackets); 1412 1413 VariableArrayTypes.push_back(New); 1414 Types.push_back(New); 1415 return QualType(New, 0); 1416} 1417 1418/// getDependentSizedArrayType - Returns a non-unique reference to 1419/// the type for a dependently-sized array of the specified element 1420/// type. FIXME: We will need these to be uniqued, or at least 1421/// comparable, at some point. 1422QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1423 Expr *NumElts, 1424 ArrayType::ArraySizeModifier ASM, 1425 unsigned EltTypeQuals, 1426 SourceRange Brackets) { 1427 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1428 "Size must be type- or value-dependent!"); 1429 1430 // Since we don't unique expressions, it isn't possible to unique 1431 // dependently-sized array types. 1432 1433 DependentSizedArrayType *New = 1434 new (*this,8) DependentSizedArrayType(EltTy, QualType(), 1435 NumElts, ASM, EltTypeQuals, 1436 Brackets); 1437 1438 DependentSizedArrayTypes.push_back(New); 1439 Types.push_back(New); 1440 return QualType(New, 0); 1441} 1442 1443QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1444 ArrayType::ArraySizeModifier ASM, 1445 unsigned EltTypeQuals) { 1446 llvm::FoldingSetNodeID ID; 1447 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1448 1449 void *InsertPos = 0; 1450 if (IncompleteArrayType *ATP = 1451 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1452 return QualType(ATP, 0); 1453 1454 // If the element type isn't canonical, this won't be a canonical type 1455 // either, so fill in the canonical type field. 1456 QualType Canonical; 1457 1458 if (!EltTy->isCanonical()) { 1459 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1460 ASM, EltTypeQuals); 1461 1462 // Get the new insert position for the node we care about. 1463 IncompleteArrayType *NewIP = 1464 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1465 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1466 } 1467 1468 IncompleteArrayType *New 1469 = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1470 ASM, EltTypeQuals); 1471 1472 IncompleteArrayTypes.InsertNode(New, InsertPos); 1473 Types.push_back(New); 1474 return QualType(New, 0); 1475} 1476 1477/// getVectorType - Return the unique reference to a vector type of 1478/// the specified element type and size. VectorType must be a built-in type. 1479QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1480 BuiltinType *baseType; 1481 1482 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1483 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1484 1485 // Check if we've already instantiated a vector of this type. 1486 llvm::FoldingSetNodeID ID; 1487 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1488 void *InsertPos = 0; 1489 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1490 return QualType(VTP, 0); 1491 1492 // If the element type isn't canonical, this won't be a canonical type either, 1493 // so fill in the canonical type field. 1494 QualType Canonical; 1495 if (!vecType->isCanonical()) { 1496 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1497 1498 // Get the new insert position for the node we care about. 1499 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1500 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1501 } 1502 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1503 VectorTypes.InsertNode(New, InsertPos); 1504 Types.push_back(New); 1505 return QualType(New, 0); 1506} 1507 1508/// getExtVectorType - Return the unique reference to an extended vector type of 1509/// the specified element type and size. VectorType must be a built-in type. 1510QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1511 BuiltinType *baseType; 1512 1513 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1514 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1515 1516 // Check if we've already instantiated a vector of this type. 1517 llvm::FoldingSetNodeID ID; 1518 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1519 void *InsertPos = 0; 1520 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1521 return QualType(VTP, 0); 1522 1523 // If the element type isn't canonical, this won't be a canonical type either, 1524 // so fill in the canonical type field. 1525 QualType Canonical; 1526 if (!vecType->isCanonical()) { 1527 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1528 1529 // Get the new insert position for the node we care about. 1530 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1531 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1532 } 1533 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1534 VectorTypes.InsertNode(New, InsertPos); 1535 Types.push_back(New); 1536 return QualType(New, 0); 1537} 1538 1539QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1540 Expr *SizeExpr, 1541 SourceLocation AttrLoc) { 1542 DependentSizedExtVectorType *New = 1543 new (*this,8) DependentSizedExtVectorType(vecType, QualType(), 1544 SizeExpr, AttrLoc); 1545 1546 DependentSizedExtVectorTypes.push_back(New); 1547 Types.push_back(New); 1548 return QualType(New, 0); 1549} 1550 1551/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1552/// 1553QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) { 1554 // Unique functions, to guarantee there is only one function of a particular 1555 // structure. 1556 llvm::FoldingSetNodeID ID; 1557 FunctionNoProtoType::Profile(ID, ResultTy); 1558 1559 void *InsertPos = 0; 1560 if (FunctionNoProtoType *FT = 1561 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1562 return QualType(FT, 0); 1563 1564 QualType Canonical; 1565 if (!ResultTy->isCanonical()) { 1566 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy)); 1567 1568 // Get the new insert position for the node we care about. 1569 FunctionNoProtoType *NewIP = 1570 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1571 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1572 } 1573 1574 FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical); 1575 Types.push_back(New); 1576 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1577 return QualType(New, 0); 1578} 1579 1580/// getFunctionType - Return a normal function type with a typed argument 1581/// list. isVariadic indicates whether the argument list includes '...'. 1582QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1583 unsigned NumArgs, bool isVariadic, 1584 unsigned TypeQuals, bool hasExceptionSpec, 1585 bool hasAnyExceptionSpec, unsigned NumExs, 1586 const QualType *ExArray) { 1587 // Unique functions, to guarantee there is only one function of a particular 1588 // structure. 1589 llvm::FoldingSetNodeID ID; 1590 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1591 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1592 NumExs, ExArray); 1593 1594 void *InsertPos = 0; 1595 if (FunctionProtoType *FTP = 1596 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1597 return QualType(FTP, 0); 1598 1599 // Determine whether the type being created is already canonical or not. 1600 bool isCanonical = ResultTy->isCanonical(); 1601 if (hasExceptionSpec) 1602 isCanonical = false; 1603 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1604 if (!ArgArray[i]->isCanonical()) 1605 isCanonical = false; 1606 1607 // If this type isn't canonical, get the canonical version of it. 1608 // The exception spec is not part of the canonical type. 1609 QualType Canonical; 1610 if (!isCanonical) { 1611 llvm::SmallVector<QualType, 16> CanonicalArgs; 1612 CanonicalArgs.reserve(NumArgs); 1613 for (unsigned i = 0; i != NumArgs; ++i) 1614 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1615 1616 Canonical = getFunctionType(getCanonicalType(ResultTy), 1617 CanonicalArgs.data(), NumArgs, 1618 isVariadic, TypeQuals); 1619 1620 // Get the new insert position for the node we care about. 1621 FunctionProtoType *NewIP = 1622 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1623 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1624 } 1625 1626 // FunctionProtoType objects are allocated with extra bytes after them 1627 // for two variable size arrays (for parameter and exception types) at the 1628 // end of them. 1629 FunctionProtoType *FTP = 1630 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1631 NumArgs*sizeof(QualType) + 1632 NumExs*sizeof(QualType), 8); 1633 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1634 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1635 ExArray, NumExs, Canonical); 1636 Types.push_back(FTP); 1637 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1638 return QualType(FTP, 0); 1639} 1640 1641/// getTypeDeclType - Return the unique reference to the type for the 1642/// specified type declaration. 1643QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1644 assert(Decl && "Passed null for Decl param"); 1645 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1646 1647 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1648 return getTypedefType(Typedef); 1649 else if (isa<TemplateTypeParmDecl>(Decl)) { 1650 assert(false && "Template type parameter types are always available."); 1651 } else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1652 return getObjCInterfaceType(ObjCInterface); 1653 1654 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1655 if (PrevDecl) 1656 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1657 else 1658 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1659 } 1660 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1661 if (PrevDecl) 1662 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1663 else 1664 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1665 } 1666 else 1667 assert(false && "TypeDecl without a type?"); 1668 1669 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1670 return QualType(Decl->TypeForDecl, 0); 1671} 1672 1673/// getTypedefType - Return the unique reference to the type for the 1674/// specified typename decl. 1675QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1676 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1677 1678 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1679 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1680 Types.push_back(Decl->TypeForDecl); 1681 return QualType(Decl->TypeForDecl, 0); 1682} 1683 1684/// getObjCInterfaceType - Return the unique reference to the type for the 1685/// specified ObjC interface decl. 1686QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) { 1687 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1688 1689 ObjCInterfaceDecl *OID = const_cast<ObjCInterfaceDecl*>(Decl); 1690 Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, OID); 1691 Types.push_back(Decl->TypeForDecl); 1692 return QualType(Decl->TypeForDecl, 0); 1693} 1694 1695/// \brief Retrieve the template type parameter type for a template 1696/// parameter or parameter pack with the given depth, index, and (optionally) 1697/// name. 1698QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1699 bool ParameterPack, 1700 IdentifierInfo *Name) { 1701 llvm::FoldingSetNodeID ID; 1702 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1703 void *InsertPos = 0; 1704 TemplateTypeParmType *TypeParm 1705 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1706 1707 if (TypeParm) 1708 return QualType(TypeParm, 0); 1709 1710 if (Name) { 1711 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1712 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack, 1713 Name, Canon); 1714 } else 1715 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack); 1716 1717 Types.push_back(TypeParm); 1718 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1719 1720 return QualType(TypeParm, 0); 1721} 1722 1723QualType 1724ASTContext::getTemplateSpecializationType(TemplateName Template, 1725 const TemplateArgument *Args, 1726 unsigned NumArgs, 1727 QualType Canon) { 1728 if (!Canon.isNull()) 1729 Canon = getCanonicalType(Canon); 1730 1731 llvm::FoldingSetNodeID ID; 1732 TemplateSpecializationType::Profile(ID, Template, Args, NumArgs); 1733 1734 void *InsertPos = 0; 1735 TemplateSpecializationType *Spec 1736 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1737 1738 if (Spec) 1739 return QualType(Spec, 0); 1740 1741 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1742 sizeof(TemplateArgument) * NumArgs), 1743 8); 1744 Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon); 1745 Types.push_back(Spec); 1746 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1747 1748 return QualType(Spec, 0); 1749} 1750 1751QualType 1752ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1753 QualType NamedType) { 1754 llvm::FoldingSetNodeID ID; 1755 QualifiedNameType::Profile(ID, NNS, NamedType); 1756 1757 void *InsertPos = 0; 1758 QualifiedNameType *T 1759 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1760 if (T) 1761 return QualType(T, 0); 1762 1763 T = new (*this) QualifiedNameType(NNS, NamedType, 1764 getCanonicalType(NamedType)); 1765 Types.push_back(T); 1766 QualifiedNameTypes.InsertNode(T, InsertPos); 1767 return QualType(T, 0); 1768} 1769 1770QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1771 const IdentifierInfo *Name, 1772 QualType Canon) { 1773 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1774 1775 if (Canon.isNull()) { 1776 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1777 if (CanonNNS != NNS) 1778 Canon = getTypenameType(CanonNNS, Name); 1779 } 1780 1781 llvm::FoldingSetNodeID ID; 1782 TypenameType::Profile(ID, NNS, Name); 1783 1784 void *InsertPos = 0; 1785 TypenameType *T 1786 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1787 if (T) 1788 return QualType(T, 0); 1789 1790 T = new (*this) TypenameType(NNS, Name, Canon); 1791 Types.push_back(T); 1792 TypenameTypes.InsertNode(T, InsertPos); 1793 return QualType(T, 0); 1794} 1795 1796QualType 1797ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1798 const TemplateSpecializationType *TemplateId, 1799 QualType Canon) { 1800 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1801 1802 if (Canon.isNull()) { 1803 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1804 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1805 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1806 const TemplateSpecializationType *CanonTemplateId 1807 = CanonType->getAsTemplateSpecializationType(); 1808 assert(CanonTemplateId && 1809 "Canonical type must also be a template specialization type"); 1810 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1811 } 1812 } 1813 1814 llvm::FoldingSetNodeID ID; 1815 TypenameType::Profile(ID, NNS, TemplateId); 1816 1817 void *InsertPos = 0; 1818 TypenameType *T 1819 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1820 if (T) 1821 return QualType(T, 0); 1822 1823 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1824 Types.push_back(T); 1825 TypenameTypes.InsertNode(T, InsertPos); 1826 return QualType(T, 0); 1827} 1828 1829/// CmpProtocolNames - Comparison predicate for sorting protocols 1830/// alphabetically. 1831static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1832 const ObjCProtocolDecl *RHS) { 1833 return LHS->getDeclName() < RHS->getDeclName(); 1834} 1835 1836static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1837 unsigned &NumProtocols) { 1838 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1839 1840 // Sort protocols, keyed by name. 1841 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1842 1843 // Remove duplicates. 1844 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1845 NumProtocols = ProtocolsEnd-Protocols; 1846} 1847 1848/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1849/// the given interface decl and the conforming protocol list. 1850QualType ASTContext::getObjCObjectPointerType(ObjCInterfaceDecl *Decl, 1851 ObjCProtocolDecl **Protocols, 1852 unsigned NumProtocols) { 1853 // Sort the protocol list alphabetically to canonicalize it. 1854 if (NumProtocols) 1855 SortAndUniqueProtocols(Protocols, NumProtocols); 1856 1857 llvm::FoldingSetNodeID ID; 1858 ObjCObjectPointerType::Profile(ID, Decl, Protocols, NumProtocols); 1859 1860 void *InsertPos = 0; 1861 if (ObjCObjectPointerType *QT = 1862 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1863 return QualType(QT, 0); 1864 1865 // No Match; 1866 ObjCObjectPointerType *QType = 1867 new (*this,8) ObjCObjectPointerType(Decl, Protocols, NumProtocols); 1868 1869 Types.push_back(QType); 1870 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1871 return QualType(QType, 0); 1872} 1873 1874/// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for 1875/// the given interface decl and the conforming protocol list. 1876QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 1877 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1878 // Sort the protocol list alphabetically to canonicalize it. 1879 SortAndUniqueProtocols(Protocols, NumProtocols); 1880 1881 llvm::FoldingSetNodeID ID; 1882 ObjCQualifiedInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1883 1884 void *InsertPos = 0; 1885 if (ObjCQualifiedInterfaceType *QT = 1886 ObjCQualifiedInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1887 return QualType(QT, 0); 1888 1889 // No Match; 1890 ObjCQualifiedInterfaceType *QType = 1891 new (*this,8) ObjCQualifiedInterfaceType(Decl, Protocols, NumProtocols); 1892 1893 Types.push_back(QType); 1894 ObjCQualifiedInterfaceTypes.InsertNode(QType, InsertPos); 1895 return QualType(QType, 0); 1896} 1897 1898/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1899/// TypeOfExprType AST's (since expression's are never shared). For example, 1900/// multiple declarations that refer to "typeof(x)" all contain different 1901/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1902/// on canonical type's (which are always unique). 1903QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1904 TypeOfExprType *toe; 1905 if (tofExpr->isTypeDependent()) 1906 toe = new (*this, 8) TypeOfExprType(tofExpr); 1907 else { 1908 QualType Canonical = getCanonicalType(tofExpr->getType()); 1909 toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1910 } 1911 Types.push_back(toe); 1912 return QualType(toe, 0); 1913} 1914 1915/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1916/// TypeOfType AST's. The only motivation to unique these nodes would be 1917/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1918/// an issue. This doesn't effect the type checker, since it operates 1919/// on canonical type's (which are always unique). 1920QualType ASTContext::getTypeOfType(QualType tofType) { 1921 QualType Canonical = getCanonicalType(tofType); 1922 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1923 Types.push_back(tot); 1924 return QualType(tot, 0); 1925} 1926 1927/// getDecltypeForExpr - Given an expr, will return the decltype for that 1928/// expression, according to the rules in C++0x [dcl.type.simple]p4 1929static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 1930 if (e->isTypeDependent()) 1931 return Context.DependentTy; 1932 1933 // If e is an id expression or a class member access, decltype(e) is defined 1934 // as the type of the entity named by e. 1935 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 1936 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 1937 return VD->getType(); 1938 } 1939 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 1940 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1941 return FD->getType(); 1942 } 1943 // If e is a function call or an invocation of an overloaded operator, 1944 // (parentheses around e are ignored), decltype(e) is defined as the 1945 // return type of that function. 1946 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 1947 return CE->getCallReturnType(); 1948 1949 QualType T = e->getType(); 1950 1951 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 1952 // defined as T&, otherwise decltype(e) is defined as T. 1953 if (e->isLvalue(Context) == Expr::LV_Valid) 1954 T = Context.getLValueReferenceType(T); 1955 1956 return T; 1957} 1958 1959/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 1960/// DecltypeType AST's. The only motivation to unique these nodes would be 1961/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 1962/// an issue. This doesn't effect the type checker, since it operates 1963/// on canonical type's (which are always unique). 1964QualType ASTContext::getDecltypeType(Expr *e) { 1965 DecltypeType *dt; 1966 if (e->isTypeDependent()) // FIXME: canonicalize the expression 1967 dt = new (*this, 8) DecltypeType(e); 1968 else { 1969 QualType T = getDecltypeForExpr(e, *this); 1970 dt = new (*this, 8) DecltypeType(e, getCanonicalType(T)); 1971 } 1972 Types.push_back(dt); 1973 return QualType(dt, 0); 1974} 1975 1976/// getTagDeclType - Return the unique reference to the type for the 1977/// specified TagDecl (struct/union/class/enum) decl. 1978QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1979 assert (Decl); 1980 return getTypeDeclType(Decl); 1981} 1982 1983/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1984/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1985/// needs to agree with the definition in <stddef.h>. 1986QualType ASTContext::getSizeType() const { 1987 return getFromTargetType(Target.getSizeType()); 1988} 1989 1990/// getSignedWCharType - Return the type of "signed wchar_t". 1991/// Used when in C++, as a GCC extension. 1992QualType ASTContext::getSignedWCharType() const { 1993 // FIXME: derive from "Target" ? 1994 return WCharTy; 1995} 1996 1997/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1998/// Used when in C++, as a GCC extension. 1999QualType ASTContext::getUnsignedWCharType() const { 2000 // FIXME: derive from "Target" ? 2001 return UnsignedIntTy; 2002} 2003 2004/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2005/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2006QualType ASTContext::getPointerDiffType() const { 2007 return getFromTargetType(Target.getPtrDiffType(0)); 2008} 2009 2010//===----------------------------------------------------------------------===// 2011// Type Operators 2012//===----------------------------------------------------------------------===// 2013 2014/// getCanonicalType - Return the canonical (structural) type corresponding to 2015/// the specified potentially non-canonical type. The non-canonical version 2016/// of a type may have many "decorated" versions of types. Decorators can 2017/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2018/// to be free of any of these, allowing two canonical types to be compared 2019/// for exact equality with a simple pointer comparison. 2020QualType ASTContext::getCanonicalType(QualType T) { 2021 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 2022 2023 // If the result has type qualifiers, make sure to canonicalize them as well. 2024 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 2025 if (TypeQuals == 0) return CanType; 2026 2027 // If the type qualifiers are on an array type, get the canonical type of the 2028 // array with the qualifiers applied to the element type. 2029 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2030 if (!AT) 2031 return CanType.getQualifiedType(TypeQuals); 2032 2033 // Get the canonical version of the element with the extra qualifiers on it. 2034 // This can recursively sink qualifiers through multiple levels of arrays. 2035 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 2036 NewEltTy = getCanonicalType(NewEltTy); 2037 2038 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2039 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 2040 CAT->getIndexTypeQualifier()); 2041 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2042 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2043 IAT->getIndexTypeQualifier()); 2044 2045 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2046 return getDependentSizedArrayType(NewEltTy, 2047 DSAT->getSizeExpr(), 2048 DSAT->getSizeModifier(), 2049 DSAT->getIndexTypeQualifier(), 2050 DSAT->getBracketsRange()); 2051 2052 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2053 return getVariableArrayType(NewEltTy, 2054 VAT->getSizeExpr(), 2055 VAT->getSizeModifier(), 2056 VAT->getIndexTypeQualifier(), 2057 VAT->getBracketsRange()); 2058} 2059 2060Decl *ASTContext::getCanonicalDecl(Decl *D) { 2061 if (!D) 2062 return 0; 2063 2064 if (TagDecl *Tag = dyn_cast<TagDecl>(D)) { 2065 QualType T = getTagDeclType(Tag); 2066 return cast<TagDecl>(cast<TagType>(T.getTypePtr()->CanonicalType) 2067 ->getDecl()); 2068 } 2069 2070 if (ClassTemplateDecl *Template = dyn_cast<ClassTemplateDecl>(D)) { 2071 while (Template->getPreviousDeclaration()) 2072 Template = Template->getPreviousDeclaration(); 2073 return Template; 2074 } 2075 2076 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 2077 while (Function->getPreviousDeclaration()) 2078 Function = Function->getPreviousDeclaration(); 2079 return const_cast<FunctionDecl *>(Function); 2080 } 2081 2082 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) { 2083 while (FunTmpl->getPreviousDeclaration()) 2084 FunTmpl = FunTmpl->getPreviousDeclaration(); 2085 return FunTmpl; 2086 } 2087 2088 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 2089 while (Var->getPreviousDeclaration()) 2090 Var = Var->getPreviousDeclaration(); 2091 return const_cast<VarDecl *>(Var); 2092 } 2093 2094 return D; 2095} 2096 2097TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2098 // If this template name refers to a template, the canonical 2099 // template name merely stores the template itself. 2100 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2101 return TemplateName(cast<TemplateDecl>(getCanonicalDecl(Template))); 2102 2103 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2104 assert(DTN && "Non-dependent template names must refer to template decls."); 2105 return DTN->CanonicalTemplateName; 2106} 2107 2108NestedNameSpecifier * 2109ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2110 if (!NNS) 2111 return 0; 2112 2113 switch (NNS->getKind()) { 2114 case NestedNameSpecifier::Identifier: 2115 // Canonicalize the prefix but keep the identifier the same. 2116 return NestedNameSpecifier::Create(*this, 2117 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2118 NNS->getAsIdentifier()); 2119 2120 case NestedNameSpecifier::Namespace: 2121 // A namespace is canonical; build a nested-name-specifier with 2122 // this namespace and no prefix. 2123 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2124 2125 case NestedNameSpecifier::TypeSpec: 2126 case NestedNameSpecifier::TypeSpecWithTemplate: { 2127 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2128 NestedNameSpecifier *Prefix = 0; 2129 2130 // FIXME: This isn't the right check! 2131 if (T->isDependentType()) 2132 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 2133 2134 return NestedNameSpecifier::Create(*this, Prefix, 2135 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2136 T.getTypePtr()); 2137 } 2138 2139 case NestedNameSpecifier::Global: 2140 // The global specifier is canonical and unique. 2141 return NNS; 2142 } 2143 2144 // Required to silence a GCC warning 2145 return 0; 2146} 2147 2148 2149const ArrayType *ASTContext::getAsArrayType(QualType T) { 2150 // Handle the non-qualified case efficiently. 2151 if (T.getCVRQualifiers() == 0) { 2152 // Handle the common positive case fast. 2153 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2154 return AT; 2155 } 2156 2157 // Handle the common negative case fast, ignoring CVR qualifiers. 2158 QualType CType = T->getCanonicalTypeInternal(); 2159 2160 // Make sure to look through type qualifiers (like ExtQuals) for the negative 2161 // test. 2162 if (!isa<ArrayType>(CType) && 2163 !isa<ArrayType>(CType.getUnqualifiedType())) 2164 return 0; 2165 2166 // Apply any CVR qualifiers from the array type to the element type. This 2167 // implements C99 6.7.3p8: "If the specification of an array type includes 2168 // any type qualifiers, the element type is so qualified, not the array type." 2169 2170 // If we get here, we either have type qualifiers on the type, or we have 2171 // sugar such as a typedef in the way. If we have type qualifiers on the type 2172 // we must propagate them down into the elemeng type. 2173 unsigned CVRQuals = T.getCVRQualifiers(); 2174 unsigned AddrSpace = 0; 2175 Type *Ty = T.getTypePtr(); 2176 2177 // Rip through ExtQualType's and typedefs to get to a concrete type. 2178 while (1) { 2179 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 2180 AddrSpace = EXTQT->getAddressSpace(); 2181 Ty = EXTQT->getBaseType(); 2182 } else { 2183 T = Ty->getDesugaredType(); 2184 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 2185 break; 2186 CVRQuals |= T.getCVRQualifiers(); 2187 Ty = T.getTypePtr(); 2188 } 2189 } 2190 2191 // If we have a simple case, just return now. 2192 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2193 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 2194 return ATy; 2195 2196 // Otherwise, we have an array and we have qualifiers on it. Push the 2197 // qualifiers into the array element type and return a new array type. 2198 // Get the canonical version of the element with the extra qualifiers on it. 2199 // This can recursively sink qualifiers through multiple levels of arrays. 2200 QualType NewEltTy = ATy->getElementType(); 2201 if (AddrSpace) 2202 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 2203 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 2204 2205 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2206 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2207 CAT->getSizeModifier(), 2208 CAT->getIndexTypeQualifier())); 2209 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2210 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2211 IAT->getSizeModifier(), 2212 IAT->getIndexTypeQualifier())); 2213 2214 if (const DependentSizedArrayType *DSAT 2215 = dyn_cast<DependentSizedArrayType>(ATy)) 2216 return cast<ArrayType>( 2217 getDependentSizedArrayType(NewEltTy, 2218 DSAT->getSizeExpr(), 2219 DSAT->getSizeModifier(), 2220 DSAT->getIndexTypeQualifier(), 2221 DSAT->getBracketsRange())); 2222 2223 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2224 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2225 VAT->getSizeExpr(), 2226 VAT->getSizeModifier(), 2227 VAT->getIndexTypeQualifier(), 2228 VAT->getBracketsRange())); 2229} 2230 2231 2232/// getArrayDecayedType - Return the properly qualified result of decaying the 2233/// specified array type to a pointer. This operation is non-trivial when 2234/// handling typedefs etc. The canonical type of "T" must be an array type, 2235/// this returns a pointer to a properly qualified element of the array. 2236/// 2237/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2238QualType ASTContext::getArrayDecayedType(QualType Ty) { 2239 // Get the element type with 'getAsArrayType' so that we don't lose any 2240 // typedefs in the element type of the array. This also handles propagation 2241 // of type qualifiers from the array type into the element type if present 2242 // (C99 6.7.3p8). 2243 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2244 assert(PrettyArrayType && "Not an array type!"); 2245 2246 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2247 2248 // int x[restrict 4] -> int *restrict 2249 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 2250} 2251 2252QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 2253 QualType ElemTy = VAT->getElementType(); 2254 2255 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 2256 return getBaseElementType(VAT); 2257 2258 return ElemTy; 2259} 2260 2261/// getFloatingRank - Return a relative rank for floating point types. 2262/// This routine will assert if passed a built-in type that isn't a float. 2263static FloatingRank getFloatingRank(QualType T) { 2264 if (const ComplexType *CT = T->getAsComplexType()) 2265 return getFloatingRank(CT->getElementType()); 2266 2267 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 2268 switch (T->getAsBuiltinType()->getKind()) { 2269 default: assert(0 && "getFloatingRank(): not a floating type"); 2270 case BuiltinType::Float: return FloatRank; 2271 case BuiltinType::Double: return DoubleRank; 2272 case BuiltinType::LongDouble: return LongDoubleRank; 2273 } 2274} 2275 2276/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2277/// point or a complex type (based on typeDomain/typeSize). 2278/// 'typeDomain' is a real floating point or complex type. 2279/// 'typeSize' is a real floating point or complex type. 2280QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2281 QualType Domain) const { 2282 FloatingRank EltRank = getFloatingRank(Size); 2283 if (Domain->isComplexType()) { 2284 switch (EltRank) { 2285 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2286 case FloatRank: return FloatComplexTy; 2287 case DoubleRank: return DoubleComplexTy; 2288 case LongDoubleRank: return LongDoubleComplexTy; 2289 } 2290 } 2291 2292 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2293 switch (EltRank) { 2294 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2295 case FloatRank: return FloatTy; 2296 case DoubleRank: return DoubleTy; 2297 case LongDoubleRank: return LongDoubleTy; 2298 } 2299} 2300 2301/// getFloatingTypeOrder - Compare the rank of the two specified floating 2302/// point types, ignoring the domain of the type (i.e. 'double' == 2303/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2304/// LHS < RHS, return -1. 2305int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2306 FloatingRank LHSR = getFloatingRank(LHS); 2307 FloatingRank RHSR = getFloatingRank(RHS); 2308 2309 if (LHSR == RHSR) 2310 return 0; 2311 if (LHSR > RHSR) 2312 return 1; 2313 return -1; 2314} 2315 2316/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2317/// routine will assert if passed a built-in type that isn't an integer or enum, 2318/// or if it is not canonicalized. 2319unsigned ASTContext::getIntegerRank(Type *T) { 2320 assert(T->isCanonical() && "T should be canonicalized"); 2321 if (EnumType* ET = dyn_cast<EnumType>(T)) 2322 T = ET->getDecl()->getIntegerType().getTypePtr(); 2323 2324 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2325 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2326 2327 // There are two things which impact the integer rank: the width, and 2328 // the ordering of builtins. The builtin ordering is encoded in the 2329 // bottom three bits; the width is encoded in the bits above that. 2330 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2331 return FWIT->getWidth() << 3; 2332 2333 switch (cast<BuiltinType>(T)->getKind()) { 2334 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2335 case BuiltinType::Bool: 2336 return 1 + (getIntWidth(BoolTy) << 3); 2337 case BuiltinType::Char_S: 2338 case BuiltinType::Char_U: 2339 case BuiltinType::SChar: 2340 case BuiltinType::UChar: 2341 return 2 + (getIntWidth(CharTy) << 3); 2342 case BuiltinType::Short: 2343 case BuiltinType::UShort: 2344 return 3 + (getIntWidth(ShortTy) << 3); 2345 case BuiltinType::Int: 2346 case BuiltinType::UInt: 2347 return 4 + (getIntWidth(IntTy) << 3); 2348 case BuiltinType::Long: 2349 case BuiltinType::ULong: 2350 return 5 + (getIntWidth(LongTy) << 3); 2351 case BuiltinType::LongLong: 2352 case BuiltinType::ULongLong: 2353 return 6 + (getIntWidth(LongLongTy) << 3); 2354 case BuiltinType::Int128: 2355 case BuiltinType::UInt128: 2356 return 7 + (getIntWidth(Int128Ty) << 3); 2357 } 2358} 2359 2360/// getIntegerTypeOrder - Returns the highest ranked integer type: 2361/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2362/// LHS < RHS, return -1. 2363int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2364 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2365 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2366 if (LHSC == RHSC) return 0; 2367 2368 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2369 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2370 2371 unsigned LHSRank = getIntegerRank(LHSC); 2372 unsigned RHSRank = getIntegerRank(RHSC); 2373 2374 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2375 if (LHSRank == RHSRank) return 0; 2376 return LHSRank > RHSRank ? 1 : -1; 2377 } 2378 2379 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2380 if (LHSUnsigned) { 2381 // If the unsigned [LHS] type is larger, return it. 2382 if (LHSRank >= RHSRank) 2383 return 1; 2384 2385 // If the signed type can represent all values of the unsigned type, it 2386 // wins. Because we are dealing with 2's complement and types that are 2387 // powers of two larger than each other, this is always safe. 2388 return -1; 2389 } 2390 2391 // If the unsigned [RHS] type is larger, return it. 2392 if (RHSRank >= LHSRank) 2393 return -1; 2394 2395 // If the signed type can represent all values of the unsigned type, it 2396 // wins. Because we are dealing with 2's complement and types that are 2397 // powers of two larger than each other, this is always safe. 2398 return 1; 2399} 2400 2401// getCFConstantStringType - Return the type used for constant CFStrings. 2402QualType ASTContext::getCFConstantStringType() { 2403 if (!CFConstantStringTypeDecl) { 2404 CFConstantStringTypeDecl = 2405 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2406 &Idents.get("NSConstantString")); 2407 QualType FieldTypes[4]; 2408 2409 // const int *isa; 2410 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2411 // int flags; 2412 FieldTypes[1] = IntTy; 2413 // const char *str; 2414 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2415 // long length; 2416 FieldTypes[3] = LongTy; 2417 2418 // Create fields 2419 for (unsigned i = 0; i < 4; ++i) { 2420 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2421 SourceLocation(), 0, 2422 FieldTypes[i], /*BitWidth=*/0, 2423 /*Mutable=*/false); 2424 CFConstantStringTypeDecl->addDecl(Field); 2425 } 2426 2427 CFConstantStringTypeDecl->completeDefinition(*this); 2428 } 2429 2430 return getTagDeclType(CFConstantStringTypeDecl); 2431} 2432 2433void ASTContext::setCFConstantStringType(QualType T) { 2434 const RecordType *Rec = T->getAsRecordType(); 2435 assert(Rec && "Invalid CFConstantStringType"); 2436 CFConstantStringTypeDecl = Rec->getDecl(); 2437} 2438 2439QualType ASTContext::getObjCFastEnumerationStateType() 2440{ 2441 if (!ObjCFastEnumerationStateTypeDecl) { 2442 ObjCFastEnumerationStateTypeDecl = 2443 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2444 &Idents.get("__objcFastEnumerationState")); 2445 2446 QualType FieldTypes[] = { 2447 UnsignedLongTy, 2448 getPointerType(ObjCIdType), 2449 getPointerType(UnsignedLongTy), 2450 getConstantArrayType(UnsignedLongTy, 2451 llvm::APInt(32, 5), ArrayType::Normal, 0) 2452 }; 2453 2454 for (size_t i = 0; i < 4; ++i) { 2455 FieldDecl *Field = FieldDecl::Create(*this, 2456 ObjCFastEnumerationStateTypeDecl, 2457 SourceLocation(), 0, 2458 FieldTypes[i], /*BitWidth=*/0, 2459 /*Mutable=*/false); 2460 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2461 } 2462 2463 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2464 } 2465 2466 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2467} 2468 2469void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2470 const RecordType *Rec = T->getAsRecordType(); 2471 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2472 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2473} 2474 2475// This returns true if a type has been typedefed to BOOL: 2476// typedef <type> BOOL; 2477static bool isTypeTypedefedAsBOOL(QualType T) { 2478 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2479 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2480 return II->isStr("BOOL"); 2481 2482 return false; 2483} 2484 2485/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2486/// purpose. 2487int ASTContext::getObjCEncodingTypeSize(QualType type) { 2488 uint64_t sz = getTypeSize(type); 2489 2490 // Make all integer and enum types at least as large as an int 2491 if (sz > 0 && type->isIntegralType()) 2492 sz = std::max(sz, getTypeSize(IntTy)); 2493 // Treat arrays as pointers, since that's how they're passed in. 2494 else if (type->isArrayType()) 2495 sz = getTypeSize(VoidPtrTy); 2496 return sz / getTypeSize(CharTy); 2497} 2498 2499/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2500/// declaration. 2501void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2502 std::string& S) { 2503 // FIXME: This is not very efficient. 2504 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2505 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2506 // Encode result type. 2507 getObjCEncodingForType(Decl->getResultType(), S); 2508 // Compute size of all parameters. 2509 // Start with computing size of a pointer in number of bytes. 2510 // FIXME: There might(should) be a better way of doing this computation! 2511 SourceLocation Loc; 2512 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2513 // The first two arguments (self and _cmd) are pointers; account for 2514 // their size. 2515 int ParmOffset = 2 * PtrSize; 2516 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2517 E = Decl->param_end(); PI != E; ++PI) { 2518 QualType PType = (*PI)->getType(); 2519 int sz = getObjCEncodingTypeSize(PType); 2520 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2521 ParmOffset += sz; 2522 } 2523 S += llvm::utostr(ParmOffset); 2524 S += "@0:"; 2525 S += llvm::utostr(PtrSize); 2526 2527 // Argument types. 2528 ParmOffset = 2 * PtrSize; 2529 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2530 E = Decl->param_end(); PI != E; ++PI) { 2531 ParmVarDecl *PVDecl = *PI; 2532 QualType PType = PVDecl->getOriginalType(); 2533 if (const ArrayType *AT = 2534 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2535 // Use array's original type only if it has known number of 2536 // elements. 2537 if (!isa<ConstantArrayType>(AT)) 2538 PType = PVDecl->getType(); 2539 } else if (PType->isFunctionType()) 2540 PType = PVDecl->getType(); 2541 // Process argument qualifiers for user supplied arguments; such as, 2542 // 'in', 'inout', etc. 2543 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2544 getObjCEncodingForType(PType, S); 2545 S += llvm::utostr(ParmOffset); 2546 ParmOffset += getObjCEncodingTypeSize(PType); 2547 } 2548} 2549 2550/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2551/// property declaration. If non-NULL, Container must be either an 2552/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2553/// NULL when getting encodings for protocol properties. 2554/// Property attributes are stored as a comma-delimited C string. The simple 2555/// attributes readonly and bycopy are encoded as single characters. The 2556/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2557/// encoded as single characters, followed by an identifier. Property types 2558/// are also encoded as a parametrized attribute. The characters used to encode 2559/// these attributes are defined by the following enumeration: 2560/// @code 2561/// enum PropertyAttributes { 2562/// kPropertyReadOnly = 'R', // property is read-only. 2563/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2564/// kPropertyByref = '&', // property is a reference to the value last assigned 2565/// kPropertyDynamic = 'D', // property is dynamic 2566/// kPropertyGetter = 'G', // followed by getter selector name 2567/// kPropertySetter = 'S', // followed by setter selector name 2568/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2569/// kPropertyType = 't' // followed by old-style type encoding. 2570/// kPropertyWeak = 'W' // 'weak' property 2571/// kPropertyStrong = 'P' // property GC'able 2572/// kPropertyNonAtomic = 'N' // property non-atomic 2573/// }; 2574/// @endcode 2575void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2576 const Decl *Container, 2577 std::string& S) { 2578 // Collect information from the property implementation decl(s). 2579 bool Dynamic = false; 2580 ObjCPropertyImplDecl *SynthesizePID = 0; 2581 2582 // FIXME: Duplicated code due to poor abstraction. 2583 if (Container) { 2584 if (const ObjCCategoryImplDecl *CID = 2585 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2586 for (ObjCCategoryImplDecl::propimpl_iterator 2587 i = CID->propimpl_begin(), e = CID->propimpl_end(); 2588 i != e; ++i) { 2589 ObjCPropertyImplDecl *PID = *i; 2590 if (PID->getPropertyDecl() == PD) { 2591 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2592 Dynamic = true; 2593 } else { 2594 SynthesizePID = PID; 2595 } 2596 } 2597 } 2598 } else { 2599 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2600 for (ObjCCategoryImplDecl::propimpl_iterator 2601 i = OID->propimpl_begin(), e = OID->propimpl_end(); 2602 i != e; ++i) { 2603 ObjCPropertyImplDecl *PID = *i; 2604 if (PID->getPropertyDecl() == PD) { 2605 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2606 Dynamic = true; 2607 } else { 2608 SynthesizePID = PID; 2609 } 2610 } 2611 } 2612 } 2613 } 2614 2615 // FIXME: This is not very efficient. 2616 S = "T"; 2617 2618 // Encode result type. 2619 // GCC has some special rules regarding encoding of properties which 2620 // closely resembles encoding of ivars. 2621 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2622 true /* outermost type */, 2623 true /* encoding for property */); 2624 2625 if (PD->isReadOnly()) { 2626 S += ",R"; 2627 } else { 2628 switch (PD->getSetterKind()) { 2629 case ObjCPropertyDecl::Assign: break; 2630 case ObjCPropertyDecl::Copy: S += ",C"; break; 2631 case ObjCPropertyDecl::Retain: S += ",&"; break; 2632 } 2633 } 2634 2635 // It really isn't clear at all what this means, since properties 2636 // are "dynamic by default". 2637 if (Dynamic) 2638 S += ",D"; 2639 2640 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2641 S += ",N"; 2642 2643 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2644 S += ",G"; 2645 S += PD->getGetterName().getAsString(); 2646 } 2647 2648 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2649 S += ",S"; 2650 S += PD->getSetterName().getAsString(); 2651 } 2652 2653 if (SynthesizePID) { 2654 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2655 S += ",V"; 2656 S += OID->getNameAsString(); 2657 } 2658 2659 // FIXME: OBJCGC: weak & strong 2660} 2661 2662/// getLegacyIntegralTypeEncoding - 2663/// Another legacy compatibility encoding: 32-bit longs are encoded as 2664/// 'l' or 'L' , but not always. For typedefs, we need to use 2665/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2666/// 2667void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2668 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 2669 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2670 if (BT->getKind() == BuiltinType::ULong && 2671 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2672 PointeeTy = UnsignedIntTy; 2673 else 2674 if (BT->getKind() == BuiltinType::Long && 2675 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2676 PointeeTy = IntTy; 2677 } 2678 } 2679} 2680 2681void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2682 const FieldDecl *Field) { 2683 // We follow the behavior of gcc, expanding structures which are 2684 // directly pointed to, and expanding embedded structures. Note that 2685 // these rules are sufficient to prevent recursive encoding of the 2686 // same type. 2687 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2688 true /* outermost type */); 2689} 2690 2691static void EncodeBitField(const ASTContext *Context, std::string& S, 2692 const FieldDecl *FD) { 2693 const Expr *E = FD->getBitWidth(); 2694 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2695 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2696 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2697 S += 'b'; 2698 S += llvm::utostr(N); 2699} 2700 2701void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2702 bool ExpandPointedToStructures, 2703 bool ExpandStructures, 2704 const FieldDecl *FD, 2705 bool OutermostType, 2706 bool EncodingProperty) { 2707 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2708 if (FD && FD->isBitField()) { 2709 EncodeBitField(this, S, FD); 2710 } 2711 else { 2712 char encoding; 2713 switch (BT->getKind()) { 2714 default: assert(0 && "Unhandled builtin type kind"); 2715 case BuiltinType::Void: encoding = 'v'; break; 2716 case BuiltinType::Bool: encoding = 'B'; break; 2717 case BuiltinType::Char_U: 2718 case BuiltinType::UChar: encoding = 'C'; break; 2719 case BuiltinType::UShort: encoding = 'S'; break; 2720 case BuiltinType::UInt: encoding = 'I'; break; 2721 case BuiltinType::ULong: 2722 encoding = 2723 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2724 break; 2725 case BuiltinType::UInt128: encoding = 'T'; break; 2726 case BuiltinType::ULongLong: encoding = 'Q'; break; 2727 case BuiltinType::Char_S: 2728 case BuiltinType::SChar: encoding = 'c'; break; 2729 case BuiltinType::Short: encoding = 's'; break; 2730 case BuiltinType::Int: encoding = 'i'; break; 2731 case BuiltinType::Long: 2732 encoding = 2733 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2734 break; 2735 case BuiltinType::LongLong: encoding = 'q'; break; 2736 case BuiltinType::Int128: encoding = 't'; break; 2737 case BuiltinType::Float: encoding = 'f'; break; 2738 case BuiltinType::Double: encoding = 'd'; break; 2739 case BuiltinType::LongDouble: encoding = 'd'; break; 2740 } 2741 2742 S += encoding; 2743 } 2744 } else if (const ComplexType *CT = T->getAsComplexType()) { 2745 S += 'j'; 2746 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2747 false); 2748 } else if (T->isObjCQualifiedIdType()) { 2749 getObjCEncodingForTypeImpl(getObjCIdType(), S, 2750 ExpandPointedToStructures, 2751 ExpandStructures, FD); 2752 if (FD || EncodingProperty) { 2753 // Note that we do extended encoding of protocol qualifer list 2754 // Only when doing ivar or property encoding. 2755 const ObjCObjectPointerType *QIDT = T->getAsObjCQualifiedIdType(); 2756 S += '"'; 2757 for (ObjCObjectPointerType::qual_iterator I = QIDT->qual_begin(), 2758 E = QIDT->qual_end(); I != E; ++I) { 2759 S += '<'; 2760 S += (*I)->getNameAsString(); 2761 S += '>'; 2762 } 2763 S += '"'; 2764 } 2765 return; 2766 } 2767 else if (const PointerType *PT = T->getAsPointerType()) { 2768 QualType PointeeTy = PT->getPointeeType(); 2769 bool isReadOnly = false; 2770 // For historical/compatibility reasons, the read-only qualifier of the 2771 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2772 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2773 // Also, do not emit the 'r' for anything but the outermost type! 2774 if (dyn_cast<TypedefType>(T.getTypePtr())) { 2775 if (OutermostType && T.isConstQualified()) { 2776 isReadOnly = true; 2777 S += 'r'; 2778 } 2779 } 2780 else if (OutermostType) { 2781 QualType P = PointeeTy; 2782 while (P->getAsPointerType()) 2783 P = P->getAsPointerType()->getPointeeType(); 2784 if (P.isConstQualified()) { 2785 isReadOnly = true; 2786 S += 'r'; 2787 } 2788 } 2789 if (isReadOnly) { 2790 // Another legacy compatibility encoding. Some ObjC qualifier and type 2791 // combinations need to be rearranged. 2792 // Rewrite "in const" from "nr" to "rn" 2793 const char * s = S.c_str(); 2794 int len = S.length(); 2795 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2796 std::string replace = "rn"; 2797 S.replace(S.end()-2, S.end(), replace); 2798 } 2799 } 2800 if (isObjCIdStructType(PointeeTy)) { 2801 S += '@'; 2802 return; 2803 } 2804 else if (PointeeTy->isObjCInterfaceType()) { 2805 if (!EncodingProperty && 2806 isa<TypedefType>(PointeeTy.getTypePtr())) { 2807 // Another historical/compatibility reason. 2808 // We encode the underlying type which comes out as 2809 // {...}; 2810 S += '^'; 2811 getObjCEncodingForTypeImpl(PointeeTy, S, 2812 false, ExpandPointedToStructures, 2813 NULL); 2814 return; 2815 } 2816 S += '@'; 2817 if (FD || EncodingProperty) { 2818 const ObjCInterfaceType *OIT = 2819 PointeeTy.getUnqualifiedType()->getAsObjCInterfaceType(); 2820 ObjCInterfaceDecl *OI = OIT->getDecl(); 2821 S += '"'; 2822 S += OI->getNameAsCString(); 2823 for (ObjCInterfaceType::qual_iterator I = OIT->qual_begin(), 2824 E = OIT->qual_end(); I != E; ++I) { 2825 S += '<'; 2826 S += (*I)->getNameAsString(); 2827 S += '>'; 2828 } 2829 S += '"'; 2830 } 2831 return; 2832 } else if (isObjCClassStructType(PointeeTy)) { 2833 S += '#'; 2834 return; 2835 } else if (isObjCSelType(PointeeTy)) { 2836 S += ':'; 2837 return; 2838 } 2839 2840 if (PointeeTy->isCharType()) { 2841 // char pointer types should be encoded as '*' unless it is a 2842 // type that has been typedef'd to 'BOOL'. 2843 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2844 S += '*'; 2845 return; 2846 } 2847 } 2848 2849 S += '^'; 2850 getLegacyIntegralTypeEncoding(PointeeTy); 2851 2852 getObjCEncodingForTypeImpl(PointeeTy, S, 2853 false, ExpandPointedToStructures, 2854 NULL); 2855 } else if (const ArrayType *AT = 2856 // Ignore type qualifiers etc. 2857 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2858 if (isa<IncompleteArrayType>(AT)) { 2859 // Incomplete arrays are encoded as a pointer to the array element. 2860 S += '^'; 2861 2862 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2863 false, ExpandStructures, FD); 2864 } else { 2865 S += '['; 2866 2867 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2868 S += llvm::utostr(CAT->getSize().getZExtValue()); 2869 else { 2870 //Variable length arrays are encoded as a regular array with 0 elements. 2871 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2872 S += '0'; 2873 } 2874 2875 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2876 false, ExpandStructures, FD); 2877 S += ']'; 2878 } 2879 } else if (T->getAsFunctionType()) { 2880 S += '?'; 2881 } else if (const RecordType *RTy = T->getAsRecordType()) { 2882 RecordDecl *RDecl = RTy->getDecl(); 2883 S += RDecl->isUnion() ? '(' : '{'; 2884 // Anonymous structures print as '?' 2885 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2886 S += II->getName(); 2887 } else { 2888 S += '?'; 2889 } 2890 if (ExpandStructures) { 2891 S += '='; 2892 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 2893 FieldEnd = RDecl->field_end(); 2894 Field != FieldEnd; ++Field) { 2895 if (FD) { 2896 S += '"'; 2897 S += Field->getNameAsString(); 2898 S += '"'; 2899 } 2900 2901 // Special case bit-fields. 2902 if (Field->isBitField()) { 2903 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2904 (*Field)); 2905 } else { 2906 QualType qt = Field->getType(); 2907 getLegacyIntegralTypeEncoding(qt); 2908 getObjCEncodingForTypeImpl(qt, S, false, true, 2909 FD); 2910 } 2911 } 2912 } 2913 S += RDecl->isUnion() ? ')' : '}'; 2914 } else if (T->isEnumeralType()) { 2915 if (FD && FD->isBitField()) 2916 EncodeBitField(this, S, FD); 2917 else 2918 S += 'i'; 2919 } else if (T->isBlockPointerType()) { 2920 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2921 } else if (T->isObjCInterfaceType()) { 2922 // @encode(class_name) 2923 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2924 S += '{'; 2925 const IdentifierInfo *II = OI->getIdentifier(); 2926 S += II->getName(); 2927 S += '='; 2928 llvm::SmallVector<FieldDecl*, 32> RecFields; 2929 CollectObjCIvars(OI, RecFields); 2930 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2931 if (RecFields[i]->isBitField()) 2932 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2933 RecFields[i]); 2934 else 2935 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2936 FD); 2937 } 2938 S += '}'; 2939 } 2940 else 2941 assert(0 && "@encode for type not implemented!"); 2942} 2943 2944void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2945 std::string& S) const { 2946 if (QT & Decl::OBJC_TQ_In) 2947 S += 'n'; 2948 if (QT & Decl::OBJC_TQ_Inout) 2949 S += 'N'; 2950 if (QT & Decl::OBJC_TQ_Out) 2951 S += 'o'; 2952 if (QT & Decl::OBJC_TQ_Bycopy) 2953 S += 'O'; 2954 if (QT & Decl::OBJC_TQ_Byref) 2955 S += 'R'; 2956 if (QT & Decl::OBJC_TQ_Oneway) 2957 S += 'V'; 2958} 2959 2960void ASTContext::setBuiltinVaListType(QualType T) 2961{ 2962 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2963 2964 BuiltinVaListType = T; 2965} 2966 2967void ASTContext::setObjCIdType(QualType T) 2968{ 2969 ObjCIdType = T; 2970 2971 const TypedefType *TT = T->getAsTypedefType(); 2972 if (!TT) 2973 return; 2974 2975 TypedefDecl *TD = TT->getDecl(); 2976 2977 // typedef struct objc_object *id; 2978 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2979 // User error - caller will issue diagnostics. 2980 if (!ptr) 2981 return; 2982 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2983 // User error - caller will issue diagnostics. 2984 if (!rec) 2985 return; 2986 IdStructType = rec; 2987} 2988 2989void ASTContext::setObjCSelType(QualType T) 2990{ 2991 ObjCSelType = T; 2992 2993 const TypedefType *TT = T->getAsTypedefType(); 2994 if (!TT) 2995 return; 2996 TypedefDecl *TD = TT->getDecl(); 2997 2998 // typedef struct objc_selector *SEL; 2999 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 3000 if (!ptr) 3001 return; 3002 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3003 if (!rec) 3004 return; 3005 SelStructType = rec; 3006} 3007 3008void ASTContext::setObjCProtoType(QualType QT) 3009{ 3010 ObjCProtoType = QT; 3011} 3012 3013void ASTContext::setObjCClassType(QualType T) 3014{ 3015 ObjCClassType = T; 3016 3017 const TypedefType *TT = T->getAsTypedefType(); 3018 if (!TT) 3019 return; 3020 TypedefDecl *TD = TT->getDecl(); 3021 3022 // typedef struct objc_class *Class; 3023 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 3024 assert(ptr && "'Class' incorrectly typed"); 3025 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3026 assert(rec && "'Class' incorrectly typed"); 3027 ClassStructType = rec; 3028} 3029 3030void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3031 assert(ObjCConstantStringType.isNull() && 3032 "'NSConstantString' type already set!"); 3033 3034 ObjCConstantStringType = getObjCInterfaceType(Decl); 3035} 3036 3037/// \brief Retrieve the template name that represents a qualified 3038/// template name such as \c std::vector. 3039TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3040 bool TemplateKeyword, 3041 TemplateDecl *Template) { 3042 llvm::FoldingSetNodeID ID; 3043 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3044 3045 void *InsertPos = 0; 3046 QualifiedTemplateName *QTN = 3047 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3048 if (!QTN) { 3049 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3050 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3051 } 3052 3053 return TemplateName(QTN); 3054} 3055 3056/// \brief Retrieve the template name that represents a dependent 3057/// template name such as \c MetaFun::template apply. 3058TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3059 const IdentifierInfo *Name) { 3060 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 3061 3062 llvm::FoldingSetNodeID ID; 3063 DependentTemplateName::Profile(ID, NNS, Name); 3064 3065 void *InsertPos = 0; 3066 DependentTemplateName *QTN = 3067 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3068 3069 if (QTN) 3070 return TemplateName(QTN); 3071 3072 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3073 if (CanonNNS == NNS) { 3074 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3075 } else { 3076 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3077 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3078 } 3079 3080 DependentTemplateNames.InsertNode(QTN, InsertPos); 3081 return TemplateName(QTN); 3082} 3083 3084/// getFromTargetType - Given one of the integer types provided by 3085/// TargetInfo, produce the corresponding type. The unsigned @p Type 3086/// is actually a value of type @c TargetInfo::IntType. 3087QualType ASTContext::getFromTargetType(unsigned Type) const { 3088 switch (Type) { 3089 case TargetInfo::NoInt: return QualType(); 3090 case TargetInfo::SignedShort: return ShortTy; 3091 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3092 case TargetInfo::SignedInt: return IntTy; 3093 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3094 case TargetInfo::SignedLong: return LongTy; 3095 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3096 case TargetInfo::SignedLongLong: return LongLongTy; 3097 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3098 } 3099 3100 assert(false && "Unhandled TargetInfo::IntType value"); 3101 return QualType(); 3102} 3103 3104//===----------------------------------------------------------------------===// 3105// Type Predicates. 3106//===----------------------------------------------------------------------===// 3107 3108/// isObjCNSObjectType - Return true if this is an NSObject object using 3109/// NSObject attribute on a c-style pointer type. 3110/// FIXME - Make it work directly on types. 3111/// 3112bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3113 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3114 if (TypedefDecl *TD = TDT->getDecl()) 3115 if (TD->getAttr<ObjCNSObjectAttr>()) 3116 return true; 3117 } 3118 return false; 3119} 3120 3121/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 3122/// to an object type. This includes "id" and "Class" (two 'special' pointers 3123/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 3124/// ID type). 3125bool ASTContext::isObjCObjectPointerType(QualType Ty) const { 3126 if (Ty->isObjCQualifiedIdType()) 3127 return true; 3128 3129 // Blocks are objects. 3130 if (Ty->isBlockPointerType()) 3131 return true; 3132 3133 // All other object types are pointers. 3134 const PointerType *PT = Ty->getAsPointerType(); 3135 if (PT == 0) 3136 return false; 3137 3138 // If this a pointer to an interface (e.g. NSString*), it is ok. 3139 if (PT->getPointeeType()->isObjCInterfaceType() || 3140 // If is has NSObject attribute, OK as well. 3141 isObjCNSObjectType(Ty)) 3142 return true; 3143 3144 // Check to see if this is 'id' or 'Class', both of which are typedefs for 3145 // pointer types. This looks for the typedef specifically, not for the 3146 // underlying type. Iteratively strip off typedefs so that we can handle 3147 // typedefs of typedefs. 3148 while (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3149 if (Ty.getUnqualifiedType() == getObjCIdType() || 3150 Ty.getUnqualifiedType() == getObjCClassType()) 3151 return true; 3152 3153 Ty = TDT->getDecl()->getUnderlyingType(); 3154 } 3155 3156 return false; 3157} 3158 3159/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3160/// garbage collection attribute. 3161/// 3162QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3163 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 3164 if (getLangOptions().ObjC1 && 3165 getLangOptions().getGCMode() != LangOptions::NonGC) { 3166 GCAttrs = Ty.getObjCGCAttr(); 3167 // Default behavious under objective-c's gc is for objective-c pointers 3168 // (or pointers to them) be treated as though they were declared 3169 // as __strong. 3170 if (GCAttrs == QualType::GCNone) { 3171 if (isObjCObjectPointerType(Ty)) 3172 GCAttrs = QualType::Strong; 3173 else if (Ty->isPointerType()) 3174 return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType()); 3175 } 3176 // Non-pointers have none gc'able attribute regardless of the attribute 3177 // set on them. 3178 else if (!Ty->isPointerType() && !isObjCObjectPointerType(Ty)) 3179 return QualType::GCNone; 3180 } 3181 return GCAttrs; 3182} 3183 3184//===----------------------------------------------------------------------===// 3185// Type Compatibility Testing 3186//===----------------------------------------------------------------------===// 3187 3188/// areCompatVectorTypes - Return true if the two specified vector types are 3189/// compatible. 3190static bool areCompatVectorTypes(const VectorType *LHS, 3191 const VectorType *RHS) { 3192 assert(LHS->isCanonical() && RHS->isCanonical()); 3193 return LHS->getElementType() == RHS->getElementType() && 3194 LHS->getNumElements() == RHS->getNumElements(); 3195} 3196 3197/// canAssignObjCInterfaces - Return true if the two interface types are 3198/// compatible for assignment from RHS to LHS. This handles validation of any 3199/// protocol qualifiers on the LHS or RHS. 3200/// 3201bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3202 const ObjCInterfaceType *RHS) { 3203 // Verify that the base decls are compatible: the RHS must be a subclass of 3204 // the LHS. 3205 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3206 return false; 3207 3208 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3209 // protocol qualified at all, then we are good. 3210 if (!isa<ObjCQualifiedInterfaceType>(LHS)) 3211 return true; 3212 3213 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3214 // isn't a superset. 3215 if (!isa<ObjCQualifiedInterfaceType>(RHS)) 3216 return true; // FIXME: should return false! 3217 3218 // Finally, we must have two protocol-qualified interfaces. 3219 const ObjCQualifiedInterfaceType *LHSP =cast<ObjCQualifiedInterfaceType>(LHS); 3220 const ObjCQualifiedInterfaceType *RHSP =cast<ObjCQualifiedInterfaceType>(RHS); 3221 3222 // All LHS protocols must have a presence on the RHS. 3223 assert(LHSP->qual_begin() != LHSP->qual_end() && "Empty LHS protocol list?"); 3224 3225 for (ObjCQualifiedInterfaceType::qual_iterator LHSPI = LHSP->qual_begin(), 3226 LHSPE = LHSP->qual_end(); 3227 LHSPI != LHSPE; LHSPI++) { 3228 bool RHSImplementsProtocol = false; 3229 3230 // If the RHS doesn't implement the protocol on the left, the types 3231 // are incompatible. 3232 for (ObjCQualifiedInterfaceType::qual_iterator RHSPI = RHSP->qual_begin(), 3233 RHSPE = RHSP->qual_end(); 3234 !RHSImplementsProtocol && (RHSPI != RHSPE); RHSPI++) { 3235 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) 3236 RHSImplementsProtocol = true; 3237 } 3238 // FIXME: For better diagnostics, consider passing back the protocol name. 3239 if (!RHSImplementsProtocol) 3240 return false; 3241 } 3242 // The RHS implements all protocols listed on the LHS. 3243 return true; 3244} 3245 3246bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3247 // get the "pointed to" types 3248 const PointerType *LHSPT = LHS->getAsPointerType(); 3249 const PointerType *RHSPT = RHS->getAsPointerType(); 3250 3251 if (!LHSPT || !RHSPT) 3252 return false; 3253 3254 QualType lhptee = LHSPT->getPointeeType(); 3255 QualType rhptee = RHSPT->getPointeeType(); 3256 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 3257 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 3258 // ID acts sort of like void* for ObjC interfaces 3259 if (LHSIface && isObjCIdStructType(rhptee)) 3260 return true; 3261 if (RHSIface && isObjCIdStructType(lhptee)) 3262 return true; 3263 if (!LHSIface || !RHSIface) 3264 return false; 3265 return canAssignObjCInterfaces(LHSIface, RHSIface) || 3266 canAssignObjCInterfaces(RHSIface, LHSIface); 3267} 3268 3269/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3270/// both shall have the identically qualified version of a compatible type. 3271/// C99 6.2.7p1: Two types have compatible types if their types are the 3272/// same. See 6.7.[2,3,5] for additional rules. 3273bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3274 return !mergeTypes(LHS, RHS).isNull(); 3275} 3276 3277QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3278 const FunctionType *lbase = lhs->getAsFunctionType(); 3279 const FunctionType *rbase = rhs->getAsFunctionType(); 3280 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3281 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3282 bool allLTypes = true; 3283 bool allRTypes = true; 3284 3285 // Check return type 3286 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3287 if (retType.isNull()) return QualType(); 3288 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3289 allLTypes = false; 3290 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3291 allRTypes = false; 3292 3293 if (lproto && rproto) { // two C99 style function prototypes 3294 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3295 "C++ shouldn't be here"); 3296 unsigned lproto_nargs = lproto->getNumArgs(); 3297 unsigned rproto_nargs = rproto->getNumArgs(); 3298 3299 // Compatible functions must have the same number of arguments 3300 if (lproto_nargs != rproto_nargs) 3301 return QualType(); 3302 3303 // Variadic and non-variadic functions aren't compatible 3304 if (lproto->isVariadic() != rproto->isVariadic()) 3305 return QualType(); 3306 3307 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3308 return QualType(); 3309 3310 // Check argument compatibility 3311 llvm::SmallVector<QualType, 10> types; 3312 for (unsigned i = 0; i < lproto_nargs; i++) { 3313 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3314 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3315 QualType argtype = mergeTypes(largtype, rargtype); 3316 if (argtype.isNull()) return QualType(); 3317 types.push_back(argtype); 3318 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3319 allLTypes = false; 3320 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3321 allRTypes = false; 3322 } 3323 if (allLTypes) return lhs; 3324 if (allRTypes) return rhs; 3325 return getFunctionType(retType, types.begin(), types.size(), 3326 lproto->isVariadic(), lproto->getTypeQuals()); 3327 } 3328 3329 if (lproto) allRTypes = false; 3330 if (rproto) allLTypes = false; 3331 3332 const FunctionProtoType *proto = lproto ? lproto : rproto; 3333 if (proto) { 3334 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3335 if (proto->isVariadic()) return QualType(); 3336 // Check that the types are compatible with the types that 3337 // would result from default argument promotions (C99 6.7.5.3p15). 3338 // The only types actually affected are promotable integer 3339 // types and floats, which would be passed as a different 3340 // type depending on whether the prototype is visible. 3341 unsigned proto_nargs = proto->getNumArgs(); 3342 for (unsigned i = 0; i < proto_nargs; ++i) { 3343 QualType argTy = proto->getArgType(i); 3344 if (argTy->isPromotableIntegerType() || 3345 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3346 return QualType(); 3347 } 3348 3349 if (allLTypes) return lhs; 3350 if (allRTypes) return rhs; 3351 return getFunctionType(retType, proto->arg_type_begin(), 3352 proto->getNumArgs(), lproto->isVariadic(), 3353 lproto->getTypeQuals()); 3354 } 3355 3356 if (allLTypes) return lhs; 3357 if (allRTypes) return rhs; 3358 return getFunctionNoProtoType(retType); 3359} 3360 3361QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3362 // C++ [expr]: If an expression initially has the type "reference to T", the 3363 // type is adjusted to "T" prior to any further analysis, the expression 3364 // designates the object or function denoted by the reference, and the 3365 // expression is an lvalue unless the reference is an rvalue reference and 3366 // the expression is a function call (possibly inside parentheses). 3367 // FIXME: C++ shouldn't be going through here! The rules are different 3368 // enough that they should be handled separately. 3369 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3370 // shouldn't be going through here! 3371 if (const ReferenceType *RT = LHS->getAsReferenceType()) 3372 LHS = RT->getPointeeType(); 3373 if (const ReferenceType *RT = RHS->getAsReferenceType()) 3374 RHS = RT->getPointeeType(); 3375 3376 QualType LHSCan = getCanonicalType(LHS), 3377 RHSCan = getCanonicalType(RHS); 3378 3379 // If two types are identical, they are compatible. 3380 if (LHSCan == RHSCan) 3381 return LHS; 3382 3383 // If the qualifiers are different, the types aren't compatible 3384 // Note that we handle extended qualifiers later, in the 3385 // case for ExtQualType. 3386 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3387 return QualType(); 3388 3389 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3390 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3391 3392 // We want to consider the two function types to be the same for these 3393 // comparisons, just force one to the other. 3394 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3395 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3396 3397 // Strip off objc_gc attributes off the top level so they can be merged. 3398 // This is a complete mess, but the attribute itself doesn't make much sense. 3399 if (RHSClass == Type::ExtQual) { 3400 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3401 if (GCAttr != QualType::GCNone) { 3402 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3403 // __weak attribute must appear on both declarations. 3404 // __strong attribue is redundant if other decl is an objective-c 3405 // object pointer (or decorated with __strong attribute); otherwise 3406 // issue error. 3407 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3408 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3409 LHSCan->isPointerType() && !isObjCObjectPointerType(LHSCan) && 3410 !isObjCIdStructType(LHSCan->getAsPointerType()->getPointeeType()))) 3411 return QualType(); 3412 3413 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3414 RHS.getCVRQualifiers()); 3415 QualType Result = mergeTypes(LHS, RHS); 3416 if (!Result.isNull()) { 3417 if (Result.getObjCGCAttr() == QualType::GCNone) 3418 Result = getObjCGCQualType(Result, GCAttr); 3419 else if (Result.getObjCGCAttr() != GCAttr) 3420 Result = QualType(); 3421 } 3422 return Result; 3423 } 3424 } 3425 if (LHSClass == Type::ExtQual) { 3426 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3427 if (GCAttr != QualType::GCNone) { 3428 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3429 // __weak attribute must appear on both declarations. __strong 3430 // __strong attribue is redundant if other decl is an objective-c 3431 // object pointer (or decorated with __strong attribute); otherwise 3432 // issue error. 3433 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3434 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3435 RHSCan->isPointerType() && !isObjCObjectPointerType(RHSCan) && 3436 !isObjCIdStructType(RHSCan->getAsPointerType()->getPointeeType()))) 3437 return QualType(); 3438 3439 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3440 LHS.getCVRQualifiers()); 3441 QualType Result = mergeTypes(LHS, RHS); 3442 if (!Result.isNull()) { 3443 if (Result.getObjCGCAttr() == QualType::GCNone) 3444 Result = getObjCGCQualType(Result, GCAttr); 3445 else if (Result.getObjCGCAttr() != GCAttr) 3446 Result = QualType(); 3447 } 3448 return Result; 3449 } 3450 } 3451 3452 // Same as above for arrays 3453 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3454 LHSClass = Type::ConstantArray; 3455 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3456 RHSClass = Type::ConstantArray; 3457 3458 // Canonicalize ExtVector -> Vector. 3459 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3460 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3461 3462 // Consider qualified interfaces and interfaces the same. 3463 if (LHSClass == Type::ObjCQualifiedInterface) LHSClass = Type::ObjCInterface; 3464 if (RHSClass == Type::ObjCQualifiedInterface) RHSClass = Type::ObjCInterface; 3465 3466 // If the canonical type classes don't match. 3467 if (LHSClass != RHSClass) { 3468 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3469 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3470 3471 // 'id' and 'Class' act sort of like void* for ObjC interfaces 3472 if (LHSIface && (isObjCIdStructType(RHS) || isObjCClassStructType(RHS))) 3473 return LHS; 3474 if (RHSIface && (isObjCIdStructType(LHS) || isObjCClassStructType(LHS))) 3475 return RHS; 3476 3477 // ID is compatible with all qualified id types. 3478 if (LHS->isObjCQualifiedIdType()) { 3479 if (const PointerType *PT = RHS->getAsPointerType()) { 3480 QualType pType = PT->getPointeeType(); 3481 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3482 return LHS; 3483 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3484 // Unfortunately, this API is part of Sema (which we don't have access 3485 // to. Need to refactor. The following check is insufficient, since we 3486 // need to make sure the class implements the protocol. 3487 if (pType->isObjCInterfaceType()) 3488 return LHS; 3489 } 3490 } 3491 if (RHS->isObjCQualifiedIdType()) { 3492 if (const PointerType *PT = LHS->getAsPointerType()) { 3493 QualType pType = PT->getPointeeType(); 3494 if (isObjCIdStructType(pType) || isObjCClassStructType(pType)) 3495 return RHS; 3496 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 3497 // Unfortunately, this API is part of Sema (which we don't have access 3498 // to. Need to refactor. The following check is insufficient, since we 3499 // need to make sure the class implements the protocol. 3500 if (pType->isObjCInterfaceType()) 3501 return RHS; 3502 } 3503 } 3504 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3505 // a signed integer type, or an unsigned integer type. 3506 if (const EnumType* ETy = LHS->getAsEnumType()) { 3507 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3508 return RHS; 3509 } 3510 if (const EnumType* ETy = RHS->getAsEnumType()) { 3511 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3512 return LHS; 3513 } 3514 3515 return QualType(); 3516 } 3517 3518 // The canonical type classes match. 3519 switch (LHSClass) { 3520#define TYPE(Class, Base) 3521#define ABSTRACT_TYPE(Class, Base) 3522#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3523#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3524#include "clang/AST/TypeNodes.def" 3525 assert(false && "Non-canonical and dependent types shouldn't get here"); 3526 return QualType(); 3527 3528 case Type::LValueReference: 3529 case Type::RValueReference: 3530 case Type::MemberPointer: 3531 assert(false && "C++ should never be in mergeTypes"); 3532 return QualType(); 3533 3534 case Type::IncompleteArray: 3535 case Type::VariableArray: 3536 case Type::FunctionProto: 3537 case Type::ExtVector: 3538 case Type::ObjCQualifiedInterface: 3539 assert(false && "Types are eliminated above"); 3540 return QualType(); 3541 3542 case Type::Pointer: 3543 { 3544 // Merge two pointer types, while trying to preserve typedef info 3545 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 3546 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 3547 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3548 if (ResultType.isNull()) return QualType(); 3549 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3550 return LHS; 3551 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3552 return RHS; 3553 return getPointerType(ResultType); 3554 } 3555 case Type::BlockPointer: 3556 { 3557 // Merge two block pointer types, while trying to preserve typedef info 3558 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 3559 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 3560 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3561 if (ResultType.isNull()) return QualType(); 3562 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3563 return LHS; 3564 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3565 return RHS; 3566 return getBlockPointerType(ResultType); 3567 } 3568 case Type::ConstantArray: 3569 { 3570 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3571 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3572 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3573 return QualType(); 3574 3575 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3576 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3577 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3578 if (ResultType.isNull()) return QualType(); 3579 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3580 return LHS; 3581 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3582 return RHS; 3583 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3584 ArrayType::ArraySizeModifier(), 0); 3585 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3586 ArrayType::ArraySizeModifier(), 0); 3587 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3588 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3589 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3590 return LHS; 3591 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3592 return RHS; 3593 if (LVAT) { 3594 // FIXME: This isn't correct! But tricky to implement because 3595 // the array's size has to be the size of LHS, but the type 3596 // has to be different. 3597 return LHS; 3598 } 3599 if (RVAT) { 3600 // FIXME: This isn't correct! But tricky to implement because 3601 // the array's size has to be the size of RHS, but the type 3602 // has to be different. 3603 return RHS; 3604 } 3605 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3606 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3607 return getIncompleteArrayType(ResultType, 3608 ArrayType::ArraySizeModifier(), 0); 3609 } 3610 case Type::FunctionNoProto: 3611 return mergeFunctionTypes(LHS, RHS); 3612 case Type::Record: 3613 case Type::Enum: 3614 // FIXME: Why are these compatible? 3615 if (isObjCIdStructType(LHS) && isObjCClassStructType(RHS)) return LHS; 3616 if (isObjCClassStructType(LHS) && isObjCIdStructType(RHS)) return LHS; 3617 return QualType(); 3618 case Type::Builtin: 3619 // Only exactly equal builtin types are compatible, which is tested above. 3620 return QualType(); 3621 case Type::Complex: 3622 // Distinct complex types are incompatible. 3623 return QualType(); 3624 case Type::Vector: 3625 // FIXME: The merged type should be an ExtVector! 3626 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3627 return LHS; 3628 return QualType(); 3629 case Type::ObjCInterface: { 3630 // Check if the interfaces are assignment compatible. 3631 // FIXME: This should be type compatibility, e.g. whether 3632 // "LHS x; RHS x;" at global scope is legal. 3633 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3634 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3635 if (LHSIface && RHSIface && 3636 canAssignObjCInterfaces(LHSIface, RHSIface)) 3637 return LHS; 3638 3639 return QualType(); 3640 } 3641 case Type::ObjCObjectPointer: 3642 // FIXME: finish 3643 // Distinct qualified id's are not compatible. 3644 return QualType(); 3645 case Type::FixedWidthInt: 3646 // Distinct fixed-width integers are not compatible. 3647 return QualType(); 3648 case Type::ExtQual: 3649 // FIXME: ExtQual types can be compatible even if they're not 3650 // identical! 3651 return QualType(); 3652 // First attempt at an implementation, but I'm not really sure it's 3653 // right... 3654#if 0 3655 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3656 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3657 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3658 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3659 return QualType(); 3660 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3661 LHSBase = QualType(LQual->getBaseType(), 0); 3662 RHSBase = QualType(RQual->getBaseType(), 0); 3663 ResultType = mergeTypes(LHSBase, RHSBase); 3664 if (ResultType.isNull()) return QualType(); 3665 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3666 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3667 return LHS; 3668 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3669 return RHS; 3670 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3671 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3672 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3673 return ResultType; 3674#endif 3675 3676 case Type::TemplateSpecialization: 3677 assert(false && "Dependent types have no size"); 3678 break; 3679 } 3680 3681 return QualType(); 3682} 3683 3684//===----------------------------------------------------------------------===// 3685// Integer Predicates 3686//===----------------------------------------------------------------------===// 3687 3688unsigned ASTContext::getIntWidth(QualType T) { 3689 if (T == BoolTy) 3690 return 1; 3691 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3692 return FWIT->getWidth(); 3693 } 3694 // For builtin types, just use the standard type sizing method 3695 return (unsigned)getTypeSize(T); 3696} 3697 3698QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3699 assert(T->isSignedIntegerType() && "Unexpected type"); 3700 if (const EnumType* ETy = T->getAsEnumType()) 3701 T = ETy->getDecl()->getIntegerType(); 3702 const BuiltinType* BTy = T->getAsBuiltinType(); 3703 assert (BTy && "Unexpected signed integer type"); 3704 switch (BTy->getKind()) { 3705 case BuiltinType::Char_S: 3706 case BuiltinType::SChar: 3707 return UnsignedCharTy; 3708 case BuiltinType::Short: 3709 return UnsignedShortTy; 3710 case BuiltinType::Int: 3711 return UnsignedIntTy; 3712 case BuiltinType::Long: 3713 return UnsignedLongTy; 3714 case BuiltinType::LongLong: 3715 return UnsignedLongLongTy; 3716 case BuiltinType::Int128: 3717 return UnsignedInt128Ty; 3718 default: 3719 assert(0 && "Unexpected signed integer type"); 3720 return QualType(); 3721 } 3722} 3723 3724ExternalASTSource::~ExternalASTSource() { } 3725 3726void ExternalASTSource::PrintStats() { } 3727 3728 3729//===----------------------------------------------------------------------===// 3730// Builtin Type Computation 3731//===----------------------------------------------------------------------===// 3732 3733/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3734/// pointer over the consumed characters. This returns the resultant type. 3735static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3736 ASTContext::GetBuiltinTypeError &Error, 3737 bool AllowTypeModifiers = true) { 3738 // Modifiers. 3739 int HowLong = 0; 3740 bool Signed = false, Unsigned = false; 3741 3742 // Read the modifiers first. 3743 bool Done = false; 3744 while (!Done) { 3745 switch (*Str++) { 3746 default: Done = true; --Str; break; 3747 case 'S': 3748 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3749 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3750 Signed = true; 3751 break; 3752 case 'U': 3753 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 3754 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 3755 Unsigned = true; 3756 break; 3757 case 'L': 3758 assert(HowLong <= 2 && "Can't have LLLL modifier"); 3759 ++HowLong; 3760 break; 3761 } 3762 } 3763 3764 QualType Type; 3765 3766 // Read the base type. 3767 switch (*Str++) { 3768 default: assert(0 && "Unknown builtin type letter!"); 3769 case 'v': 3770 assert(HowLong == 0 && !Signed && !Unsigned && 3771 "Bad modifiers used with 'v'!"); 3772 Type = Context.VoidTy; 3773 break; 3774 case 'f': 3775 assert(HowLong == 0 && !Signed && !Unsigned && 3776 "Bad modifiers used with 'f'!"); 3777 Type = Context.FloatTy; 3778 break; 3779 case 'd': 3780 assert(HowLong < 2 && !Signed && !Unsigned && 3781 "Bad modifiers used with 'd'!"); 3782 if (HowLong) 3783 Type = Context.LongDoubleTy; 3784 else 3785 Type = Context.DoubleTy; 3786 break; 3787 case 's': 3788 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 3789 if (Unsigned) 3790 Type = Context.UnsignedShortTy; 3791 else 3792 Type = Context.ShortTy; 3793 break; 3794 case 'i': 3795 if (HowLong == 3) 3796 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 3797 else if (HowLong == 2) 3798 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 3799 else if (HowLong == 1) 3800 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 3801 else 3802 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 3803 break; 3804 case 'c': 3805 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 3806 if (Signed) 3807 Type = Context.SignedCharTy; 3808 else if (Unsigned) 3809 Type = Context.UnsignedCharTy; 3810 else 3811 Type = Context.CharTy; 3812 break; 3813 case 'b': // boolean 3814 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 3815 Type = Context.BoolTy; 3816 break; 3817 case 'z': // size_t. 3818 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 3819 Type = Context.getSizeType(); 3820 break; 3821 case 'F': 3822 Type = Context.getCFConstantStringType(); 3823 break; 3824 case 'a': 3825 Type = Context.getBuiltinVaListType(); 3826 assert(!Type.isNull() && "builtin va list type not initialized!"); 3827 break; 3828 case 'A': 3829 // This is a "reference" to a va_list; however, what exactly 3830 // this means depends on how va_list is defined. There are two 3831 // different kinds of va_list: ones passed by value, and ones 3832 // passed by reference. An example of a by-value va_list is 3833 // x86, where va_list is a char*. An example of by-ref va_list 3834 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 3835 // we want this argument to be a char*&; for x86-64, we want 3836 // it to be a __va_list_tag*. 3837 Type = Context.getBuiltinVaListType(); 3838 assert(!Type.isNull() && "builtin va list type not initialized!"); 3839 if (Type->isArrayType()) { 3840 Type = Context.getArrayDecayedType(Type); 3841 } else { 3842 Type = Context.getLValueReferenceType(Type); 3843 } 3844 break; 3845 case 'V': { 3846 char *End; 3847 3848 unsigned NumElements = strtoul(Str, &End, 10); 3849 assert(End != Str && "Missing vector size"); 3850 3851 Str = End; 3852 3853 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 3854 Type = Context.getVectorType(ElementType, NumElements); 3855 break; 3856 } 3857 case 'P': { 3858 Type = Context.getFILEType(); 3859 if (Type.isNull()) { 3860 Error = ASTContext::GE_Missing_FILE; 3861 return QualType(); 3862 } else { 3863 break; 3864 } 3865 } 3866 } 3867 3868 if (!AllowTypeModifiers) 3869 return Type; 3870 3871 Done = false; 3872 while (!Done) { 3873 switch (*Str++) { 3874 default: Done = true; --Str; break; 3875 case '*': 3876 Type = Context.getPointerType(Type); 3877 break; 3878 case '&': 3879 Type = Context.getLValueReferenceType(Type); 3880 break; 3881 // FIXME: There's no way to have a built-in with an rvalue ref arg. 3882 case 'C': 3883 Type = Type.getQualifiedType(QualType::Const); 3884 break; 3885 } 3886 } 3887 3888 return Type; 3889} 3890 3891/// GetBuiltinType - Return the type for the specified builtin. 3892QualType ASTContext::GetBuiltinType(unsigned id, 3893 GetBuiltinTypeError &Error) { 3894 const char *TypeStr = BuiltinInfo.GetTypeString(id); 3895 3896 llvm::SmallVector<QualType, 8> ArgTypes; 3897 3898 Error = GE_None; 3899 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 3900 if (Error != GE_None) 3901 return QualType(); 3902 while (TypeStr[0] && TypeStr[0] != '.') { 3903 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 3904 if (Error != GE_None) 3905 return QualType(); 3906 3907 // Do array -> pointer decay. The builtin should use the decayed type. 3908 if (Ty->isArrayType()) 3909 Ty = getArrayDecayedType(Ty); 3910 3911 ArgTypes.push_back(Ty); 3912 } 3913 3914 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 3915 "'.' should only occur at end of builtin type list!"); 3916 3917 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 3918 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 3919 return getFunctionNoProtoType(ResType); 3920 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 3921 TypeStr[0] == '.', 0); 3922} 3923