ASTContext.cpp revision 4084c306635b70f37029dca938444e6013f08684
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" 27#include "RecordLayoutBuilder.h" 28 29using namespace clang; 30 31enum FloatingRank { 32 FloatRank, DoubleRank, LongDoubleRank 33}; 34 35ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 36 TargetInfo &t, 37 IdentifierTable &idents, SelectorTable &sels, 38 Builtin::Context &builtins, 39 bool FreeMem, unsigned size_reserve) : 40 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 41 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), 42 SourceMgr(SM), LangOpts(LOpts), 43 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 44 Idents(idents), Selectors(sels), 45 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 46 if (size_reserve > 0) Types.reserve(size_reserve); 47 TUDecl = TranslationUnitDecl::Create(*this); 48 InitBuiltinTypes(); 49} 50 51ASTContext::~ASTContext() { 52 // Deallocate all the types. 53 while (!Types.empty()) { 54 Types.back()->Destroy(*this); 55 Types.pop_back(); 56 } 57 58 { 59 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 60 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 61 while (I != E) { 62 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 63 delete R; 64 } 65 } 66 67 { 68 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 69 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 70 while (I != E) { 71 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 72 delete R; 73 } 74 } 75 76 // Destroy nested-name-specifiers. 77 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 78 NNS = NestedNameSpecifiers.begin(), 79 NNSEnd = NestedNameSpecifiers.end(); 80 NNS != NNSEnd; 81 /* Increment in loop */) 82 (*NNS++).Destroy(*this); 83 84 if (GlobalNestedNameSpecifier) 85 GlobalNestedNameSpecifier->Destroy(*this); 86 87 TUDecl->Destroy(*this); 88} 89 90void 91ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 92 ExternalSource.reset(Source.take()); 93} 94 95void ASTContext::PrintStats() const { 96 fprintf(stderr, "*** AST Context Stats:\n"); 97 fprintf(stderr, " %d types total.\n", (int)Types.size()); 98 99 unsigned counts[] = { 100#define TYPE(Name, Parent) 0, 101#define ABSTRACT_TYPE(Name, Parent) 102#include "clang/AST/TypeNodes.def" 103 0 // Extra 104 }; 105 106 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 107 Type *T = Types[i]; 108 counts[(unsigned)T->getTypeClass()]++; 109 } 110 111 unsigned Idx = 0; 112 unsigned TotalBytes = 0; 113#define TYPE(Name, Parent) \ 114 if (counts[Idx]) \ 115 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 116 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 117 ++Idx; 118#define ABSTRACT_TYPE(Name, Parent) 119#include "clang/AST/TypeNodes.def" 120 121 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 122 123 if (ExternalSource.get()) { 124 fprintf(stderr, "\n"); 125 ExternalSource->PrintStats(); 126 } 127} 128 129 130void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 131 Types.push_back((R = QualType(new (*this,8) BuiltinType(K),0)).getTypePtr()); 132} 133 134void ASTContext::InitBuiltinTypes() { 135 assert(VoidTy.isNull() && "Context reinitialized?"); 136 137 // C99 6.2.5p19. 138 InitBuiltinType(VoidTy, BuiltinType::Void); 139 140 // C99 6.2.5p2. 141 InitBuiltinType(BoolTy, BuiltinType::Bool); 142 // C99 6.2.5p3. 143 if (LangOpts.CharIsSigned) 144 InitBuiltinType(CharTy, BuiltinType::Char_S); 145 else 146 InitBuiltinType(CharTy, BuiltinType::Char_U); 147 // C99 6.2.5p4. 148 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 149 InitBuiltinType(ShortTy, BuiltinType::Short); 150 InitBuiltinType(IntTy, BuiltinType::Int); 151 InitBuiltinType(LongTy, BuiltinType::Long); 152 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 153 154 // C99 6.2.5p6. 155 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 156 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 157 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 158 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 159 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 160 161 // C99 6.2.5p10. 162 InitBuiltinType(FloatTy, BuiltinType::Float); 163 InitBuiltinType(DoubleTy, BuiltinType::Double); 164 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 165 166 // GNU extension, 128-bit integers. 167 InitBuiltinType(Int128Ty, BuiltinType::Int128); 168 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 169 170 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 171 InitBuiltinType(WCharTy, BuiltinType::WChar); 172 else // C99 173 WCharTy = getFromTargetType(Target.getWCharType()); 174 175 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 176 InitBuiltinType(Char16Ty, BuiltinType::Char16); 177 else // C99 178 Char16Ty = getFromTargetType(Target.getChar16Type()); 179 180 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 181 InitBuiltinType(Char32Ty, BuiltinType::Char32); 182 else // C99 183 Char32Ty = getFromTargetType(Target.getChar32Type()); 184 185 // Placeholder type for functions. 186 InitBuiltinType(OverloadTy, BuiltinType::Overload); 187 188 // Placeholder type for type-dependent expressions whose type is 189 // completely unknown. No code should ever check a type against 190 // DependentTy and users should never see it; however, it is here to 191 // help diagnose failures to properly check for type-dependent 192 // expressions. 193 InitBuiltinType(DependentTy, BuiltinType::Dependent); 194 195 // Placeholder type for C++0x auto declarations whose real type has 196 // not yet been deduced. 197 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 198 199 // C99 6.2.5p11. 200 FloatComplexTy = getComplexType(FloatTy); 201 DoubleComplexTy = getComplexType(DoubleTy); 202 LongDoubleComplexTy = getComplexType(LongDoubleTy); 203 204 BuiltinVaListType = QualType(); 205 206 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 207 ObjCIdTypedefType = QualType(); 208 ObjCClassTypedefType = QualType(); 209 210 // Builtin types for 'id' and 'Class'. 211 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 212 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 213 214 ObjCConstantStringType = QualType(); 215 216 // void * type 217 VoidPtrTy = getPointerType(VoidTy); 218 219 // nullptr type (C++0x 2.14.7) 220 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 221} 222 223namespace { 224 class BeforeInTranslationUnit 225 : std::binary_function<SourceRange, SourceRange, bool> { 226 SourceManager *SourceMgr; 227 228 public: 229 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 230 231 bool operator()(SourceRange X, SourceRange Y) { 232 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 233 } 234 }; 235} 236 237/// \brief Determine whether the given comment is a Doxygen-style comment. 238/// 239/// \param Start the start of the comment text. 240/// 241/// \param End the end of the comment text. 242/// 243/// \param Member whether we want to check whether this is a member comment 244/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 245/// we only return true when we find a non-member comment. 246static bool 247isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 248 bool Member = false) { 249 const char *BufferStart 250 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 251 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 252 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 253 254 if (End - Start < 4) 255 return false; 256 257 assert(Start[0] == '/' && "Not a comment?"); 258 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 259 return false; 260 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 261 return false; 262 263 return (Start[3] == '<') == Member; 264} 265 266/// \brief Retrieve the comment associated with the given declaration, if 267/// it has one. 268const char *ASTContext::getCommentForDecl(const Decl *D) { 269 if (!D) 270 return 0; 271 272 // Check whether we have cached a comment string for this declaration 273 // already. 274 llvm::DenseMap<const Decl *, std::string>::iterator Pos 275 = DeclComments.find(D); 276 if (Pos != DeclComments.end()) 277 return Pos->second.c_str(); 278 279 // If we have an external AST source and have not yet loaded comments from 280 // that source, do so now. 281 if (ExternalSource && !LoadedExternalComments) { 282 std::vector<SourceRange> LoadedComments; 283 ExternalSource->ReadComments(LoadedComments); 284 285 if (!LoadedComments.empty()) 286 Comments.insert(Comments.begin(), LoadedComments.begin(), 287 LoadedComments.end()); 288 289 LoadedExternalComments = true; 290 } 291 292 // If there are no comments anywhere, we won't find anything. 293 if (Comments.empty()) 294 return 0; 295 296 // If the declaration doesn't map directly to a location in a file, we 297 // can't find the comment. 298 SourceLocation DeclStartLoc = D->getLocStart(); 299 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 300 return 0; 301 302 // Find the comment that occurs just before this declaration. 303 std::vector<SourceRange>::iterator LastComment 304 = std::lower_bound(Comments.begin(), Comments.end(), 305 SourceRange(DeclStartLoc), 306 BeforeInTranslationUnit(&SourceMgr)); 307 308 // Decompose the location for the start of the declaration and find the 309 // beginning of the file buffer. 310 std::pair<FileID, unsigned> DeclStartDecomp 311 = SourceMgr.getDecomposedLoc(DeclStartLoc); 312 const char *FileBufferStart 313 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 314 315 // First check whether we have a comment for a member. 316 if (LastComment != Comments.end() && 317 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 318 isDoxygenComment(SourceMgr, *LastComment, true)) { 319 std::pair<FileID, unsigned> LastCommentEndDecomp 320 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 321 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 322 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 323 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 324 LastCommentEndDecomp.second)) { 325 // The Doxygen member comment comes after the declaration starts and 326 // is on the same line and in the same file as the declaration. This 327 // is the comment we want. 328 std::string &Result = DeclComments[D]; 329 Result.append(FileBufferStart + 330 SourceMgr.getFileOffset(LastComment->getBegin()), 331 FileBufferStart + LastCommentEndDecomp.second + 1); 332 return Result.c_str(); 333 } 334 } 335 336 if (LastComment == Comments.begin()) 337 return 0; 338 --LastComment; 339 340 // Decompose the end of the comment. 341 std::pair<FileID, unsigned> LastCommentEndDecomp 342 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 343 344 // If the comment and the declaration aren't in the same file, then they 345 // aren't related. 346 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 347 return 0; 348 349 // Check that we actually have a Doxygen comment. 350 if (!isDoxygenComment(SourceMgr, *LastComment)) 351 return 0; 352 353 // Compute the starting line for the declaration and for the end of the 354 // comment (this is expensive). 355 unsigned DeclStartLine 356 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 357 unsigned CommentEndLine 358 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 359 LastCommentEndDecomp.second); 360 361 // If the comment does not end on the line prior to the declaration, then 362 // the comment is not associated with the declaration at all. 363 if (CommentEndLine + 1 != DeclStartLine) 364 return 0; 365 366 // We have a comment, but there may be more comments on the previous lines. 367 // Keep looking so long as the comments are still Doxygen comments and are 368 // still adjacent. 369 unsigned ExpectedLine 370 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 371 std::vector<SourceRange>::iterator FirstComment = LastComment; 372 while (FirstComment != Comments.begin()) { 373 // Look at the previous comment 374 --FirstComment; 375 std::pair<FileID, unsigned> Decomp 376 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 377 378 // If this previous comment is in a different file, we're done. 379 if (Decomp.first != DeclStartDecomp.first) { 380 ++FirstComment; 381 break; 382 } 383 384 // If this comment is not a Doxygen comment, we're done. 385 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 386 ++FirstComment; 387 break; 388 } 389 390 // If the line number is not what we expected, we're done. 391 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 392 if (Line != ExpectedLine) { 393 ++FirstComment; 394 break; 395 } 396 397 // Set the next expected line number. 398 ExpectedLine 399 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 400 } 401 402 // The iterator range [FirstComment, LastComment] contains all of the 403 // BCPL comments that, together, are associated with this declaration. 404 // Form a single comment block string for this declaration that concatenates 405 // all of these comments. 406 std::string &Result = DeclComments[D]; 407 while (FirstComment != LastComment) { 408 std::pair<FileID, unsigned> DecompStart 409 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 410 std::pair<FileID, unsigned> DecompEnd 411 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 412 Result.append(FileBufferStart + DecompStart.second, 413 FileBufferStart + DecompEnd.second + 1); 414 ++FirstComment; 415 } 416 417 // Append the last comment line. 418 Result.append(FileBufferStart + 419 SourceMgr.getFileOffset(LastComment->getBegin()), 420 FileBufferStart + LastCommentEndDecomp.second + 1); 421 return Result.c_str(); 422} 423 424//===----------------------------------------------------------------------===// 425// Type Sizing and Analysis 426//===----------------------------------------------------------------------===// 427 428/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 429/// scalar floating point type. 430const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 431 const BuiltinType *BT = T->getAsBuiltinType(); 432 assert(BT && "Not a floating point type!"); 433 switch (BT->getKind()) { 434 default: assert(0 && "Not a floating point type!"); 435 case BuiltinType::Float: return Target.getFloatFormat(); 436 case BuiltinType::Double: return Target.getDoubleFormat(); 437 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 438 } 439} 440 441/// getDeclAlign - Return a conservative estimate of the alignment of the 442/// specified decl. Note that bitfields do not have a valid alignment, so 443/// this method will assert on them. 444unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 445 unsigned Align = Target.getCharWidth(); 446 447 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 448 Align = std::max(Align, AA->getAlignment()); 449 450 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 451 QualType T = VD->getType(); 452 if (const ReferenceType* RT = T->getAsReferenceType()) { 453 unsigned AS = RT->getPointeeType().getAddressSpace(); 454 Align = Target.getPointerAlign(AS); 455 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 456 // Incomplete or function types default to 1. 457 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 458 T = cast<ArrayType>(T)->getElementType(); 459 460 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 461 } 462 } 463 464 return Align / Target.getCharWidth(); 465} 466 467/// getTypeSize - Return the size of the specified type, in bits. This method 468/// does not work on incomplete types. 469std::pair<uint64_t, unsigned> 470ASTContext::getTypeInfo(const Type *T) { 471 uint64_t Width=0; 472 unsigned Align=8; 473 switch (T->getTypeClass()) { 474#define TYPE(Class, Base) 475#define ABSTRACT_TYPE(Class, Base) 476#define NON_CANONICAL_TYPE(Class, Base) 477#define DEPENDENT_TYPE(Class, Base) case Type::Class: 478#include "clang/AST/TypeNodes.def" 479 assert(false && "Should not see dependent types"); 480 break; 481 482 case Type::FunctionNoProto: 483 case Type::FunctionProto: 484 // GCC extension: alignof(function) = 32 bits 485 Width = 0; 486 Align = 32; 487 break; 488 489 case Type::IncompleteArray: 490 case Type::VariableArray: 491 Width = 0; 492 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 493 break; 494 495 case Type::ConstantArrayWithExpr: 496 case Type::ConstantArrayWithoutExpr: 497 case Type::ConstantArray: { 498 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 499 500 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 501 Width = EltInfo.first*CAT->getSize().getZExtValue(); 502 Align = EltInfo.second; 503 break; 504 } 505 case Type::ExtVector: 506 case Type::Vector: { 507 std::pair<uint64_t, unsigned> EltInfo = 508 getTypeInfo(cast<VectorType>(T)->getElementType()); 509 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 510 Align = Width; 511 // If the alignment is not a power of 2, round up to the next power of 2. 512 // This happens for non-power-of-2 length vectors. 513 // FIXME: this should probably be a target property. 514 Align = 1 << llvm::Log2_32_Ceil(Align); 515 break; 516 } 517 518 case Type::Builtin: 519 switch (cast<BuiltinType>(T)->getKind()) { 520 default: assert(0 && "Unknown builtin type!"); 521 case BuiltinType::Void: 522 // GCC extension: alignof(void) = 8 bits. 523 Width = 0; 524 Align = 8; 525 break; 526 527 case BuiltinType::Bool: 528 Width = Target.getBoolWidth(); 529 Align = Target.getBoolAlign(); 530 break; 531 case BuiltinType::Char_S: 532 case BuiltinType::Char_U: 533 case BuiltinType::UChar: 534 case BuiltinType::SChar: 535 Width = Target.getCharWidth(); 536 Align = Target.getCharAlign(); 537 break; 538 case BuiltinType::WChar: 539 Width = Target.getWCharWidth(); 540 Align = Target.getWCharAlign(); 541 break; 542 case BuiltinType::Char16: 543 Width = Target.getChar16Width(); 544 Align = Target.getChar16Align(); 545 break; 546 case BuiltinType::Char32: 547 Width = Target.getChar32Width(); 548 Align = Target.getChar32Align(); 549 break; 550 case BuiltinType::UShort: 551 case BuiltinType::Short: 552 Width = Target.getShortWidth(); 553 Align = Target.getShortAlign(); 554 break; 555 case BuiltinType::UInt: 556 case BuiltinType::Int: 557 Width = Target.getIntWidth(); 558 Align = Target.getIntAlign(); 559 break; 560 case BuiltinType::ULong: 561 case BuiltinType::Long: 562 Width = Target.getLongWidth(); 563 Align = Target.getLongAlign(); 564 break; 565 case BuiltinType::ULongLong: 566 case BuiltinType::LongLong: 567 Width = Target.getLongLongWidth(); 568 Align = Target.getLongLongAlign(); 569 break; 570 case BuiltinType::Int128: 571 case BuiltinType::UInt128: 572 Width = 128; 573 Align = 128; // int128_t is 128-bit aligned on all targets. 574 break; 575 case BuiltinType::Float: 576 Width = Target.getFloatWidth(); 577 Align = Target.getFloatAlign(); 578 break; 579 case BuiltinType::Double: 580 Width = Target.getDoubleWidth(); 581 Align = Target.getDoubleAlign(); 582 break; 583 case BuiltinType::LongDouble: 584 Width = Target.getLongDoubleWidth(); 585 Align = Target.getLongDoubleAlign(); 586 break; 587 case BuiltinType::NullPtr: 588 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 589 Align = Target.getPointerAlign(0); // == sizeof(void*) 590 break; 591 } 592 break; 593 case Type::FixedWidthInt: 594 // FIXME: This isn't precisely correct; the width/alignment should depend 595 // on the available types for the target 596 Width = cast<FixedWidthIntType>(T)->getWidth(); 597 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 598 Align = Width; 599 break; 600 case Type::ExtQual: 601 // FIXME: Pointers into different addr spaces could have different sizes and 602 // alignment requirements: getPointerInfo should take an AddrSpace. 603 return getTypeInfo(QualType(cast<ExtQualType>(T)->getBaseType(), 0)); 604 case Type::ObjCObjectPointer: 605 Width = Target.getPointerWidth(0); 606 Align = Target.getPointerAlign(0); 607 break; 608 case Type::BlockPointer: { 609 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 610 Width = Target.getPointerWidth(AS); 611 Align = Target.getPointerAlign(AS); 612 break; 613 } 614 case Type::Pointer: { 615 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 616 Width = Target.getPointerWidth(AS); 617 Align = Target.getPointerAlign(AS); 618 break; 619 } 620 case Type::LValueReference: 621 case Type::RValueReference: 622 // "When applied to a reference or a reference type, the result is the size 623 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 624 // FIXME: This is wrong for struct layout: a reference in a struct has 625 // pointer size. 626 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 627 case Type::MemberPointer: { 628 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 629 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 630 // If we ever want to support other ABIs this needs to be abstracted. 631 632 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 633 std::pair<uint64_t, unsigned> PtrDiffInfo = 634 getTypeInfo(getPointerDiffType()); 635 Width = PtrDiffInfo.first; 636 if (Pointee->isFunctionType()) 637 Width *= 2; 638 Align = PtrDiffInfo.second; 639 break; 640 } 641 case Type::Complex: { 642 // Complex types have the same alignment as their elements, but twice the 643 // size. 644 std::pair<uint64_t, unsigned> EltInfo = 645 getTypeInfo(cast<ComplexType>(T)->getElementType()); 646 Width = EltInfo.first*2; 647 Align = EltInfo.second; 648 break; 649 } 650 case Type::ObjCInterface: { 651 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 652 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 653 Width = Layout.getSize(); 654 Align = Layout.getAlignment(); 655 break; 656 } 657 case Type::Record: 658 case Type::Enum: { 659 const TagType *TT = cast<TagType>(T); 660 661 if (TT->getDecl()->isInvalidDecl()) { 662 Width = 1; 663 Align = 1; 664 break; 665 } 666 667 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 668 return getTypeInfo(ET->getDecl()->getIntegerType()); 669 670 const RecordType *RT = cast<RecordType>(TT); 671 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 672 Width = Layout.getSize(); 673 Align = Layout.getAlignment(); 674 break; 675 } 676 677 case Type::Typedef: { 678 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 679 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 680 Align = Aligned->getAlignment(); 681 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 682 } else 683 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 684 break; 685 } 686 687 case Type::TypeOfExpr: 688 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 689 .getTypePtr()); 690 691 case Type::TypeOf: 692 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 693 694 case Type::Decltype: 695 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 696 .getTypePtr()); 697 698 case Type::QualifiedName: 699 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 700 701 case Type::TemplateSpecialization: 702 assert(getCanonicalType(T) != T && 703 "Cannot request the size of a dependent type"); 704 // FIXME: this is likely to be wrong once we support template 705 // aliases, since a template alias could refer to a typedef that 706 // has an __aligned__ attribute on it. 707 return getTypeInfo(getCanonicalType(T)); 708 } 709 710 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 711 return std::make_pair(Width, Align); 712} 713 714/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 715/// type for the current target in bits. This can be different than the ABI 716/// alignment in cases where it is beneficial for performance to overalign 717/// a data type. 718unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 719 unsigned ABIAlign = getTypeAlign(T); 720 721 // Double and long long should be naturally aligned if possible. 722 if (const ComplexType* CT = T->getAsComplexType()) 723 T = CT->getElementType().getTypePtr(); 724 if (T->isSpecificBuiltinType(BuiltinType::Double) || 725 T->isSpecificBuiltinType(BuiltinType::LongLong)) 726 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 727 728 return ABIAlign; 729} 730 731static void CollectLocalObjCIvars(ASTContext *Ctx, 732 const ObjCInterfaceDecl *OI, 733 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 734 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 735 E = OI->ivar_end(); I != E; ++I) { 736 ObjCIvarDecl *IVDecl = *I; 737 if (!IVDecl->isInvalidDecl()) 738 Fields.push_back(cast<FieldDecl>(IVDecl)); 739 } 740} 741 742void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 743 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 744 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 745 CollectObjCIvars(SuperClass, Fields); 746 CollectLocalObjCIvars(this, OI, Fields); 747} 748 749/// ShallowCollectObjCIvars - 750/// Collect all ivars, including those synthesized, in the current class. 751/// 752void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 753 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 754 bool CollectSynthesized) { 755 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 756 E = OI->ivar_end(); I != E; ++I) { 757 Ivars.push_back(*I); 758 } 759 if (CollectSynthesized) 760 CollectSynthesizedIvars(OI, Ivars); 761} 762 763void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 764 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 765 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 766 E = PD->prop_end(); I != E; ++I) 767 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 768 Ivars.push_back(Ivar); 769 770 // Also look into nested protocols. 771 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 772 E = PD->protocol_end(); P != E; ++P) 773 CollectProtocolSynthesizedIvars(*P, Ivars); 774} 775 776/// CollectSynthesizedIvars - 777/// This routine collect synthesized ivars for the designated class. 778/// 779void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 780 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 781 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 782 E = OI->prop_end(); I != E; ++I) { 783 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 784 Ivars.push_back(Ivar); 785 } 786 // Also look into interface's protocol list for properties declared 787 // in the protocol and whose ivars are synthesized. 788 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 789 PE = OI->protocol_end(); P != PE; ++P) { 790 ObjCProtocolDecl *PD = (*P); 791 CollectProtocolSynthesizedIvars(PD, Ivars); 792 } 793} 794 795unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 796 unsigned count = 0; 797 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 798 E = PD->prop_end(); I != E; ++I) 799 if ((*I)->getPropertyIvarDecl()) 800 ++count; 801 802 // Also look into nested protocols. 803 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 804 E = PD->protocol_end(); P != E; ++P) 805 count += CountProtocolSynthesizedIvars(*P); 806 return count; 807} 808 809unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) 810{ 811 unsigned count = 0; 812 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 813 E = OI->prop_end(); I != E; ++I) { 814 if ((*I)->getPropertyIvarDecl()) 815 ++count; 816 } 817 // Also look into interface's protocol list for properties declared 818 // in the protocol and whose ivars are synthesized. 819 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 820 PE = OI->protocol_end(); P != PE; ++P) { 821 ObjCProtocolDecl *PD = (*P); 822 count += CountProtocolSynthesizedIvars(PD); 823 } 824 return count; 825} 826 827/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 828ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 829 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 830 I = ObjCImpls.find(D); 831 if (I != ObjCImpls.end()) 832 return cast<ObjCImplementationDecl>(I->second); 833 return 0; 834} 835/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 836ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 837 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 838 I = ObjCImpls.find(D); 839 if (I != ObjCImpls.end()) 840 return cast<ObjCCategoryImplDecl>(I->second); 841 return 0; 842} 843 844/// \brief Set the implementation of ObjCInterfaceDecl. 845void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 846 ObjCImplementationDecl *ImplD) { 847 assert(IFaceD && ImplD && "Passed null params"); 848 ObjCImpls[IFaceD] = ImplD; 849} 850/// \brief Set the implementation of ObjCCategoryDecl. 851void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 852 ObjCCategoryImplDecl *ImplD) { 853 assert(CatD && ImplD && "Passed null params"); 854 ObjCImpls[CatD] = ImplD; 855} 856 857/// getInterfaceLayoutImpl - Get or compute information about the 858/// layout of the given interface. 859/// 860/// \param Impl - If given, also include the layout of the interface's 861/// implementation. This may differ by including synthesized ivars. 862const ASTRecordLayout & 863ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 864 const ObjCImplementationDecl *Impl) { 865 assert(!D->isForwardDecl() && "Invalid interface decl!"); 866 867 // Look up this layout, if already laid out, return what we have. 868 ObjCContainerDecl *Key = 869 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 870 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 871 return *Entry; 872 873 // Add in synthesized ivar count if laying out an implementation. 874 if (Impl) { 875 unsigned FieldCount = D->ivar_size(); 876 unsigned SynthCount = CountSynthesizedIvars(D); 877 FieldCount += SynthCount; 878 // If there aren't any sythesized ivars then reuse the interface 879 // entry. Note we can't cache this because we simply free all 880 // entries later; however we shouldn't look up implementations 881 // frequently. 882 if (SynthCount == 0) 883 return getObjCLayout(D, 0); 884 } 885 886 const ASTRecordLayout *NewEntry = 887 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 888 ObjCLayouts[Key] = NewEntry; 889 890 return *NewEntry; 891} 892 893const ASTRecordLayout & 894ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 895 return getObjCLayout(D, 0); 896} 897 898const ASTRecordLayout & 899ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 900 return getObjCLayout(D->getClassInterface(), D); 901} 902 903/// getASTRecordLayout - Get or compute information about the layout of the 904/// specified record (struct/union/class), which indicates its size and field 905/// position information. 906const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 907 D = D->getDefinition(*this); 908 assert(D && "Cannot get layout of forward declarations!"); 909 910 // Look up this layout, if already laid out, return what we have. 911 // Note that we can't save a reference to the entry because this function 912 // is recursive. 913 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 914 if (Entry) return *Entry; 915 916 const ASTRecordLayout *NewEntry = 917 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 918 ASTRecordLayouts[D] = NewEntry; 919 920 return *NewEntry; 921} 922 923//===----------------------------------------------------------------------===// 924// Type creation/memoization methods 925//===----------------------------------------------------------------------===// 926 927QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 928 QualType CanT = getCanonicalType(T); 929 if (CanT.getAddressSpace() == AddressSpace) 930 return T; 931 932 // If we are composing extended qualifiers together, merge together into one 933 // ExtQualType node. 934 unsigned CVRQuals = T.getCVRQualifiers(); 935 QualType::GCAttrTypes GCAttr = QualType::GCNone; 936 Type *TypeNode = T.getTypePtr(); 937 938 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 939 // If this type already has an address space specified, it cannot get 940 // another one. 941 assert(EQT->getAddressSpace() == 0 && 942 "Type cannot be in multiple addr spaces!"); 943 GCAttr = EQT->getObjCGCAttr(); 944 TypeNode = EQT->getBaseType(); 945 } 946 947 // Check if we've already instantiated this type. 948 llvm::FoldingSetNodeID ID; 949 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 950 void *InsertPos = 0; 951 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 952 return QualType(EXTQy, CVRQuals); 953 954 // If the base type isn't canonical, this won't be a canonical type either, 955 // so fill in the canonical type field. 956 QualType Canonical; 957 if (!TypeNode->isCanonical()) { 958 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 959 960 // Update InsertPos, the previous call could have invalidated it. 961 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 962 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 963 } 964 ExtQualType *New = 965 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 966 ExtQualTypes.InsertNode(New, InsertPos); 967 Types.push_back(New); 968 return QualType(New, CVRQuals); 969} 970 971QualType ASTContext::getObjCGCQualType(QualType T, 972 QualType::GCAttrTypes GCAttr) { 973 QualType CanT = getCanonicalType(T); 974 if (CanT.getObjCGCAttr() == GCAttr) 975 return T; 976 977 if (T->isPointerType()) { 978 QualType Pointee = T->getAsPointerType()->getPointeeType(); 979 if (Pointee->isAnyPointerType()) { 980 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 981 return getPointerType(ResultType); 982 } 983 } 984 // If we are composing extended qualifiers together, merge together into one 985 // ExtQualType node. 986 unsigned CVRQuals = T.getCVRQualifiers(); 987 Type *TypeNode = T.getTypePtr(); 988 unsigned AddressSpace = 0; 989 990 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 991 // If this type already has an address space specified, it cannot get 992 // another one. 993 assert(EQT->getObjCGCAttr() == QualType::GCNone && 994 "Type cannot be in multiple addr spaces!"); 995 AddressSpace = EQT->getAddressSpace(); 996 TypeNode = EQT->getBaseType(); 997 } 998 999 // Check if we've already instantiated an gc qual'd type of this type. 1000 llvm::FoldingSetNodeID ID; 1001 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 1002 void *InsertPos = 0; 1003 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 1004 return QualType(EXTQy, CVRQuals); 1005 1006 // If the base type isn't canonical, this won't be a canonical type either, 1007 // so fill in the canonical type field. 1008 // FIXME: Isn't this also not canonical if the base type is a array 1009 // or pointer type? I can't find any documentation for objc_gc, though... 1010 QualType Canonical; 1011 if (!T->isCanonical()) { 1012 Canonical = getObjCGCQualType(CanT, GCAttr); 1013 1014 // Update InsertPos, the previous call could have invalidated it. 1015 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 1016 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1017 } 1018 ExtQualType *New = 1019 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 1020 ExtQualTypes.InsertNode(New, InsertPos); 1021 Types.push_back(New); 1022 return QualType(New, CVRQuals); 1023} 1024 1025/// getComplexType - Return the uniqued reference to the type for a complex 1026/// number with the specified element type. 1027QualType ASTContext::getComplexType(QualType T) { 1028 // Unique pointers, to guarantee there is only one pointer of a particular 1029 // structure. 1030 llvm::FoldingSetNodeID ID; 1031 ComplexType::Profile(ID, T); 1032 1033 void *InsertPos = 0; 1034 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1035 return QualType(CT, 0); 1036 1037 // If the pointee type isn't canonical, this won't be a canonical type either, 1038 // so fill in the canonical type field. 1039 QualType Canonical; 1040 if (!T->isCanonical()) { 1041 Canonical = getComplexType(getCanonicalType(T)); 1042 1043 // Get the new insert position for the node we care about. 1044 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1045 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1046 } 1047 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 1048 Types.push_back(New); 1049 ComplexTypes.InsertNode(New, InsertPos); 1050 return QualType(New, 0); 1051} 1052 1053QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1054 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1055 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1056 FixedWidthIntType *&Entry = Map[Width]; 1057 if (!Entry) 1058 Entry = new FixedWidthIntType(Width, Signed); 1059 return QualType(Entry, 0); 1060} 1061 1062/// getPointerType - Return the uniqued reference to the type for a pointer to 1063/// the specified type. 1064QualType ASTContext::getPointerType(QualType T) { 1065 // Unique pointers, to guarantee there is only one pointer of a particular 1066 // structure. 1067 llvm::FoldingSetNodeID ID; 1068 PointerType::Profile(ID, T); 1069 1070 void *InsertPos = 0; 1071 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1072 return QualType(PT, 0); 1073 1074 // If the pointee type isn't canonical, this won't be a canonical type either, 1075 // so fill in the canonical type field. 1076 QualType Canonical; 1077 if (!T->isCanonical()) { 1078 Canonical = getPointerType(getCanonicalType(T)); 1079 1080 // Get the new insert position for the node we care about. 1081 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1082 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1083 } 1084 PointerType *New = new (*this,8) PointerType(T, Canonical); 1085 Types.push_back(New); 1086 PointerTypes.InsertNode(New, InsertPos); 1087 return QualType(New, 0); 1088} 1089 1090/// getBlockPointerType - Return the uniqued reference to the type for 1091/// a pointer to the specified block. 1092QualType ASTContext::getBlockPointerType(QualType T) { 1093 assert(T->isFunctionType() && "block of function types only"); 1094 // Unique pointers, to guarantee there is only one block of a particular 1095 // structure. 1096 llvm::FoldingSetNodeID ID; 1097 BlockPointerType::Profile(ID, T); 1098 1099 void *InsertPos = 0; 1100 if (BlockPointerType *PT = 1101 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1102 return QualType(PT, 0); 1103 1104 // If the block pointee type isn't canonical, this won't be a canonical 1105 // type either so fill in the canonical type field. 1106 QualType Canonical; 1107 if (!T->isCanonical()) { 1108 Canonical = getBlockPointerType(getCanonicalType(T)); 1109 1110 // Get the new insert position for the node we care about. 1111 BlockPointerType *NewIP = 1112 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1113 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1114 } 1115 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 1116 Types.push_back(New); 1117 BlockPointerTypes.InsertNode(New, InsertPos); 1118 return QualType(New, 0); 1119} 1120 1121/// getLValueReferenceType - Return the uniqued reference to the type for an 1122/// lvalue reference to the specified type. 1123QualType ASTContext::getLValueReferenceType(QualType T) { 1124 // Unique pointers, to guarantee there is only one pointer of a particular 1125 // structure. 1126 llvm::FoldingSetNodeID ID; 1127 ReferenceType::Profile(ID, T); 1128 1129 void *InsertPos = 0; 1130 if (LValueReferenceType *RT = 1131 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1132 return QualType(RT, 0); 1133 1134 // If the referencee type isn't canonical, this won't be a canonical type 1135 // either, so fill in the canonical type field. 1136 QualType Canonical; 1137 if (!T->isCanonical()) { 1138 Canonical = getLValueReferenceType(getCanonicalType(T)); 1139 1140 // Get the new insert position for the node we care about. 1141 LValueReferenceType *NewIP = 1142 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1143 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1144 } 1145 1146 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 1147 Types.push_back(New); 1148 LValueReferenceTypes.InsertNode(New, InsertPos); 1149 return QualType(New, 0); 1150} 1151 1152/// getRValueReferenceType - Return the uniqued reference to the type for an 1153/// rvalue reference to the specified type. 1154QualType ASTContext::getRValueReferenceType(QualType T) { 1155 // Unique pointers, to guarantee there is only one pointer of a particular 1156 // structure. 1157 llvm::FoldingSetNodeID ID; 1158 ReferenceType::Profile(ID, T); 1159 1160 void *InsertPos = 0; 1161 if (RValueReferenceType *RT = 1162 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1163 return QualType(RT, 0); 1164 1165 // If the referencee type isn't canonical, this won't be a canonical type 1166 // either, so fill in the canonical type field. 1167 QualType Canonical; 1168 if (!T->isCanonical()) { 1169 Canonical = getRValueReferenceType(getCanonicalType(T)); 1170 1171 // Get the new insert position for the node we care about. 1172 RValueReferenceType *NewIP = 1173 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1174 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1175 } 1176 1177 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 1178 Types.push_back(New); 1179 RValueReferenceTypes.InsertNode(New, InsertPos); 1180 return QualType(New, 0); 1181} 1182 1183/// getMemberPointerType - Return the uniqued reference to the type for a 1184/// member pointer to the specified type, in the specified class. 1185QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1186{ 1187 // Unique pointers, to guarantee there is only one pointer of a particular 1188 // structure. 1189 llvm::FoldingSetNodeID ID; 1190 MemberPointerType::Profile(ID, T, Cls); 1191 1192 void *InsertPos = 0; 1193 if (MemberPointerType *PT = 1194 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1195 return QualType(PT, 0); 1196 1197 // If the pointee or class type isn't canonical, this won't be a canonical 1198 // type either, so fill in the canonical type field. 1199 QualType Canonical; 1200 if (!T->isCanonical()) { 1201 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1202 1203 // Get the new insert position for the node we care about. 1204 MemberPointerType *NewIP = 1205 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1206 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1207 } 1208 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1209 Types.push_back(New); 1210 MemberPointerTypes.InsertNode(New, InsertPos); 1211 return QualType(New, 0); 1212} 1213 1214/// getConstantArrayType - Return the unique reference to the type for an 1215/// array of the specified element type. 1216QualType ASTContext::getConstantArrayType(QualType EltTy, 1217 const llvm::APInt &ArySizeIn, 1218 ArrayType::ArraySizeModifier ASM, 1219 unsigned EltTypeQuals) { 1220 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1221 "Constant array of VLAs is illegal!"); 1222 1223 // Convert the array size into a canonical width matching the pointer size for 1224 // the target. 1225 llvm::APInt ArySize(ArySizeIn); 1226 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1227 1228 llvm::FoldingSetNodeID ID; 1229 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1230 1231 void *InsertPos = 0; 1232 if (ConstantArrayType *ATP = 1233 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1234 return QualType(ATP, 0); 1235 1236 // If the element type isn't canonical, this won't be a canonical type either, 1237 // so fill in the canonical type field. 1238 QualType Canonical; 1239 if (!EltTy->isCanonical()) { 1240 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1241 ASM, EltTypeQuals); 1242 // Get the new insert position for the node we care about. 1243 ConstantArrayType *NewIP = 1244 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1245 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1246 } 1247 1248 ConstantArrayType *New = 1249 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1250 ConstantArrayTypes.InsertNode(New, InsertPos); 1251 Types.push_back(New); 1252 return QualType(New, 0); 1253} 1254 1255/// getConstantArrayWithExprType - Return a reference to the type for 1256/// an array of the specified element type. 1257QualType 1258ASTContext::getConstantArrayWithExprType(QualType EltTy, 1259 const llvm::APInt &ArySizeIn, 1260 Expr *ArySizeExpr, 1261 ArrayType::ArraySizeModifier ASM, 1262 unsigned EltTypeQuals, 1263 SourceRange Brackets) { 1264 // Convert the array size into a canonical width matching the pointer 1265 // size for the target. 1266 llvm::APInt ArySize(ArySizeIn); 1267 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1268 1269 // Compute the canonical ConstantArrayType. 1270 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1271 ArySize, ASM, EltTypeQuals); 1272 // Since we don't unique expressions, it isn't possible to unique VLA's 1273 // that have an expression provided for their size. 1274 ConstantArrayWithExprType *New = 1275 new(*this,8)ConstantArrayWithExprType(EltTy, Canonical, 1276 ArySize, ArySizeExpr, 1277 ASM, EltTypeQuals, Brackets); 1278 Types.push_back(New); 1279 return QualType(New, 0); 1280} 1281 1282/// getConstantArrayWithoutExprType - Return a reference to the type for 1283/// an array of the specified element type. 1284QualType 1285ASTContext::getConstantArrayWithoutExprType(QualType EltTy, 1286 const llvm::APInt &ArySizeIn, 1287 ArrayType::ArraySizeModifier ASM, 1288 unsigned EltTypeQuals) { 1289 // Convert the array size into a canonical width matching the pointer 1290 // size for the target. 1291 llvm::APInt ArySize(ArySizeIn); 1292 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1293 1294 // Compute the canonical ConstantArrayType. 1295 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1296 ArySize, ASM, EltTypeQuals); 1297 ConstantArrayWithoutExprType *New = 1298 new(*this,8)ConstantArrayWithoutExprType(EltTy, Canonical, 1299 ArySize, ASM, EltTypeQuals); 1300 Types.push_back(New); 1301 return QualType(New, 0); 1302} 1303 1304/// getVariableArrayType - Returns a non-unique reference to the type for a 1305/// variable array of the specified element type. 1306QualType ASTContext::getVariableArrayType(QualType EltTy, 1307 Expr *NumElts, 1308 ArrayType::ArraySizeModifier ASM, 1309 unsigned EltTypeQuals, 1310 SourceRange Brackets) { 1311 // Since we don't unique expressions, it isn't possible to unique VLA's 1312 // that have an expression provided for their size. 1313 1314 VariableArrayType *New = 1315 new(*this,8)VariableArrayType(EltTy, QualType(), 1316 NumElts, ASM, EltTypeQuals, Brackets); 1317 1318 VariableArrayTypes.push_back(New); 1319 Types.push_back(New); 1320 return QualType(New, 0); 1321} 1322 1323/// getDependentSizedArrayType - Returns a non-unique reference to 1324/// the type for a dependently-sized array of the specified element 1325/// type. FIXME: We will need these to be uniqued, or at least 1326/// comparable, at some point. 1327QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1328 Expr *NumElts, 1329 ArrayType::ArraySizeModifier ASM, 1330 unsigned EltTypeQuals, 1331 SourceRange Brackets) { 1332 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1333 "Size must be type- or value-dependent!"); 1334 1335 // Since we don't unique expressions, it isn't possible to unique 1336 // dependently-sized array types. 1337 1338 DependentSizedArrayType *New = 1339 new (*this,8) DependentSizedArrayType(EltTy, QualType(), 1340 NumElts, ASM, EltTypeQuals, 1341 Brackets); 1342 1343 DependentSizedArrayTypes.push_back(New); 1344 Types.push_back(New); 1345 return QualType(New, 0); 1346} 1347 1348QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1349 ArrayType::ArraySizeModifier ASM, 1350 unsigned EltTypeQuals) { 1351 llvm::FoldingSetNodeID ID; 1352 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1353 1354 void *InsertPos = 0; 1355 if (IncompleteArrayType *ATP = 1356 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1357 return QualType(ATP, 0); 1358 1359 // If the element type isn't canonical, this won't be a canonical type 1360 // either, so fill in the canonical type field. 1361 QualType Canonical; 1362 1363 if (!EltTy->isCanonical()) { 1364 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1365 ASM, EltTypeQuals); 1366 1367 // Get the new insert position for the node we care about. 1368 IncompleteArrayType *NewIP = 1369 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1370 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1371 } 1372 1373 IncompleteArrayType *New 1374 = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1375 ASM, EltTypeQuals); 1376 1377 IncompleteArrayTypes.InsertNode(New, InsertPos); 1378 Types.push_back(New); 1379 return QualType(New, 0); 1380} 1381 1382/// getVectorType - Return the unique reference to a vector type of 1383/// the specified element type and size. VectorType must be a built-in type. 1384QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1385 BuiltinType *baseType; 1386 1387 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1388 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1389 1390 // Check if we've already instantiated a vector of this type. 1391 llvm::FoldingSetNodeID ID; 1392 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1393 void *InsertPos = 0; 1394 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1395 return QualType(VTP, 0); 1396 1397 // If the element type isn't canonical, this won't be a canonical type either, 1398 // so fill in the canonical type field. 1399 QualType Canonical; 1400 if (!vecType->isCanonical()) { 1401 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1402 1403 // Get the new insert position for the node we care about. 1404 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1405 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1406 } 1407 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1408 VectorTypes.InsertNode(New, InsertPos); 1409 Types.push_back(New); 1410 return QualType(New, 0); 1411} 1412 1413/// getExtVectorType - Return the unique reference to an extended vector type of 1414/// the specified element type and size. VectorType must be a built-in type. 1415QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1416 BuiltinType *baseType; 1417 1418 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1419 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1420 1421 // Check if we've already instantiated a vector of this type. 1422 llvm::FoldingSetNodeID ID; 1423 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1424 void *InsertPos = 0; 1425 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1426 return QualType(VTP, 0); 1427 1428 // If the element type isn't canonical, this won't be a canonical type either, 1429 // so fill in the canonical type field. 1430 QualType Canonical; 1431 if (!vecType->isCanonical()) { 1432 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1433 1434 // Get the new insert position for the node we care about. 1435 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1436 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1437 } 1438 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1439 VectorTypes.InsertNode(New, InsertPos); 1440 Types.push_back(New); 1441 return QualType(New, 0); 1442} 1443 1444QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1445 Expr *SizeExpr, 1446 SourceLocation AttrLoc) { 1447 DependentSizedExtVectorType *New = 1448 new (*this,8) DependentSizedExtVectorType(vecType, QualType(), 1449 SizeExpr, AttrLoc); 1450 1451 DependentSizedExtVectorTypes.push_back(New); 1452 Types.push_back(New); 1453 return QualType(New, 0); 1454} 1455 1456/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1457/// 1458QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) { 1459 // Unique functions, to guarantee there is only one function of a particular 1460 // structure. 1461 llvm::FoldingSetNodeID ID; 1462 FunctionNoProtoType::Profile(ID, ResultTy); 1463 1464 void *InsertPos = 0; 1465 if (FunctionNoProtoType *FT = 1466 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1467 return QualType(FT, 0); 1468 1469 QualType Canonical; 1470 if (!ResultTy->isCanonical()) { 1471 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy)); 1472 1473 // Get the new insert position for the node we care about. 1474 FunctionNoProtoType *NewIP = 1475 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1476 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1477 } 1478 1479 FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical); 1480 Types.push_back(New); 1481 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1482 return QualType(New, 0); 1483} 1484 1485/// getFunctionType - Return a normal function type with a typed argument 1486/// list. isVariadic indicates whether the argument list includes '...'. 1487QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1488 unsigned NumArgs, bool isVariadic, 1489 unsigned TypeQuals, bool hasExceptionSpec, 1490 bool hasAnyExceptionSpec, unsigned NumExs, 1491 const QualType *ExArray) { 1492 // Unique functions, to guarantee there is only one function of a particular 1493 // structure. 1494 llvm::FoldingSetNodeID ID; 1495 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1496 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1497 NumExs, ExArray); 1498 1499 void *InsertPos = 0; 1500 if (FunctionProtoType *FTP = 1501 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1502 return QualType(FTP, 0); 1503 1504 // Determine whether the type being created is already canonical or not. 1505 bool isCanonical = ResultTy->isCanonical(); 1506 if (hasExceptionSpec) 1507 isCanonical = false; 1508 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1509 if (!ArgArray[i]->isCanonical()) 1510 isCanonical = false; 1511 1512 // If this type isn't canonical, get the canonical version of it. 1513 // The exception spec is not part of the canonical type. 1514 QualType Canonical; 1515 if (!isCanonical) { 1516 llvm::SmallVector<QualType, 16> CanonicalArgs; 1517 CanonicalArgs.reserve(NumArgs); 1518 for (unsigned i = 0; i != NumArgs; ++i) 1519 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1520 1521 Canonical = getFunctionType(getCanonicalType(ResultTy), 1522 CanonicalArgs.data(), NumArgs, 1523 isVariadic, TypeQuals); 1524 1525 // Get the new insert position for the node we care about. 1526 FunctionProtoType *NewIP = 1527 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1528 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1529 } 1530 1531 // FunctionProtoType objects are allocated with extra bytes after them 1532 // for two variable size arrays (for parameter and exception types) at the 1533 // end of them. 1534 FunctionProtoType *FTP = 1535 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1536 NumArgs*sizeof(QualType) + 1537 NumExs*sizeof(QualType), 8); 1538 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1539 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1540 ExArray, NumExs, Canonical); 1541 Types.push_back(FTP); 1542 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1543 return QualType(FTP, 0); 1544} 1545 1546/// getTypeDeclType - Return the unique reference to the type for the 1547/// specified type declaration. 1548QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1549 assert(Decl && "Passed null for Decl param"); 1550 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1551 1552 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1553 return getTypedefType(Typedef); 1554 else if (isa<TemplateTypeParmDecl>(Decl)) { 1555 assert(false && "Template type parameter types are always available."); 1556 } else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1557 return getObjCInterfaceType(ObjCInterface); 1558 1559 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1560 if (PrevDecl) 1561 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1562 else 1563 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1564 } 1565 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1566 if (PrevDecl) 1567 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1568 else 1569 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1570 } 1571 else 1572 assert(false && "TypeDecl without a type?"); 1573 1574 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1575 return QualType(Decl->TypeForDecl, 0); 1576} 1577 1578/// getTypedefType - Return the unique reference to the type for the 1579/// specified typename decl. 1580QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1581 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1582 1583 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1584 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1585 Types.push_back(Decl->TypeForDecl); 1586 return QualType(Decl->TypeForDecl, 0); 1587} 1588 1589/// \brief Retrieve the template type parameter type for a template 1590/// parameter or parameter pack with the given depth, index, and (optionally) 1591/// name. 1592QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1593 bool ParameterPack, 1594 IdentifierInfo *Name) { 1595 llvm::FoldingSetNodeID ID; 1596 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1597 void *InsertPos = 0; 1598 TemplateTypeParmType *TypeParm 1599 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1600 1601 if (TypeParm) 1602 return QualType(TypeParm, 0); 1603 1604 if (Name) { 1605 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1606 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack, 1607 Name, Canon); 1608 } else 1609 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack); 1610 1611 Types.push_back(TypeParm); 1612 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1613 1614 return QualType(TypeParm, 0); 1615} 1616 1617QualType 1618ASTContext::getTemplateSpecializationType(TemplateName Template, 1619 const TemplateArgument *Args, 1620 unsigned NumArgs, 1621 QualType Canon) { 1622 if (!Canon.isNull()) 1623 Canon = getCanonicalType(Canon); 1624 1625 llvm::FoldingSetNodeID ID; 1626 TemplateSpecializationType::Profile(ID, Template, Args, NumArgs); 1627 1628 void *InsertPos = 0; 1629 TemplateSpecializationType *Spec 1630 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1631 1632 if (Spec) 1633 return QualType(Spec, 0); 1634 1635 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1636 sizeof(TemplateArgument) * NumArgs), 1637 8); 1638 Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon); 1639 Types.push_back(Spec); 1640 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1641 1642 return QualType(Spec, 0); 1643} 1644 1645QualType 1646ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1647 QualType NamedType) { 1648 llvm::FoldingSetNodeID ID; 1649 QualifiedNameType::Profile(ID, NNS, NamedType); 1650 1651 void *InsertPos = 0; 1652 QualifiedNameType *T 1653 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1654 if (T) 1655 return QualType(T, 0); 1656 1657 T = new (*this) QualifiedNameType(NNS, NamedType, 1658 getCanonicalType(NamedType)); 1659 Types.push_back(T); 1660 QualifiedNameTypes.InsertNode(T, InsertPos); 1661 return QualType(T, 0); 1662} 1663 1664QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1665 const IdentifierInfo *Name, 1666 QualType Canon) { 1667 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1668 1669 if (Canon.isNull()) { 1670 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1671 if (CanonNNS != NNS) 1672 Canon = getTypenameType(CanonNNS, Name); 1673 } 1674 1675 llvm::FoldingSetNodeID ID; 1676 TypenameType::Profile(ID, NNS, Name); 1677 1678 void *InsertPos = 0; 1679 TypenameType *T 1680 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1681 if (T) 1682 return QualType(T, 0); 1683 1684 T = new (*this) TypenameType(NNS, Name, Canon); 1685 Types.push_back(T); 1686 TypenameTypes.InsertNode(T, InsertPos); 1687 return QualType(T, 0); 1688} 1689 1690QualType 1691ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1692 const TemplateSpecializationType *TemplateId, 1693 QualType Canon) { 1694 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1695 1696 if (Canon.isNull()) { 1697 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1698 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1699 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1700 const TemplateSpecializationType *CanonTemplateId 1701 = CanonType->getAsTemplateSpecializationType(); 1702 assert(CanonTemplateId && 1703 "Canonical type must also be a template specialization type"); 1704 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1705 } 1706 } 1707 1708 llvm::FoldingSetNodeID ID; 1709 TypenameType::Profile(ID, NNS, TemplateId); 1710 1711 void *InsertPos = 0; 1712 TypenameType *T 1713 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1714 if (T) 1715 return QualType(T, 0); 1716 1717 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1718 Types.push_back(T); 1719 TypenameTypes.InsertNode(T, InsertPos); 1720 return QualType(T, 0); 1721} 1722 1723/// CmpProtocolNames - Comparison predicate for sorting protocols 1724/// alphabetically. 1725static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1726 const ObjCProtocolDecl *RHS) { 1727 return LHS->getDeclName() < RHS->getDeclName(); 1728} 1729 1730static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1731 unsigned &NumProtocols) { 1732 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1733 1734 // Sort protocols, keyed by name. 1735 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1736 1737 // Remove duplicates. 1738 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1739 NumProtocols = ProtocolsEnd-Protocols; 1740} 1741 1742/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1743/// the given interface decl and the conforming protocol list. 1744QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1745 ObjCProtocolDecl **Protocols, 1746 unsigned NumProtocols) { 1747 // Sort the protocol list alphabetically to canonicalize it. 1748 if (NumProtocols) 1749 SortAndUniqueProtocols(Protocols, NumProtocols); 1750 1751 llvm::FoldingSetNodeID ID; 1752 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1753 1754 void *InsertPos = 0; 1755 if (ObjCObjectPointerType *QT = 1756 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1757 return QualType(QT, 0); 1758 1759 // No Match; 1760 ObjCObjectPointerType *QType = 1761 new (*this,8) ObjCObjectPointerType(InterfaceT, Protocols, NumProtocols); 1762 1763 Types.push_back(QType); 1764 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1765 return QualType(QType, 0); 1766} 1767 1768/// getObjCInterfaceType - Return the unique reference to the type for the 1769/// specified ObjC interface decl. The list of protocols is optional. 1770QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1771 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1772 if (NumProtocols) 1773 // Sort the protocol list alphabetically to canonicalize it. 1774 SortAndUniqueProtocols(Protocols, NumProtocols); 1775 1776 llvm::FoldingSetNodeID ID; 1777 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1778 1779 void *InsertPos = 0; 1780 if (ObjCInterfaceType *QT = 1781 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1782 return QualType(QT, 0); 1783 1784 // No Match; 1785 ObjCInterfaceType *QType = 1786 new (*this,8) ObjCInterfaceType(const_cast<ObjCInterfaceDecl*>(Decl), 1787 Protocols, NumProtocols); 1788 Types.push_back(QType); 1789 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 1790 return QualType(QType, 0); 1791} 1792 1793/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1794/// TypeOfExprType AST's (since expression's are never shared). For example, 1795/// multiple declarations that refer to "typeof(x)" all contain different 1796/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1797/// on canonical type's (which are always unique). 1798QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1799 TypeOfExprType *toe; 1800 if (tofExpr->isTypeDependent()) 1801 toe = new (*this, 8) TypeOfExprType(tofExpr); 1802 else { 1803 QualType Canonical = getCanonicalType(tofExpr->getType()); 1804 toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1805 } 1806 Types.push_back(toe); 1807 return QualType(toe, 0); 1808} 1809 1810/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1811/// TypeOfType AST's. The only motivation to unique these nodes would be 1812/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1813/// an issue. This doesn't effect the type checker, since it operates 1814/// on canonical type's (which are always unique). 1815QualType ASTContext::getTypeOfType(QualType tofType) { 1816 QualType Canonical = getCanonicalType(tofType); 1817 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1818 Types.push_back(tot); 1819 return QualType(tot, 0); 1820} 1821 1822/// getDecltypeForExpr - Given an expr, will return the decltype for that 1823/// expression, according to the rules in C++0x [dcl.type.simple]p4 1824static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 1825 if (e->isTypeDependent()) 1826 return Context.DependentTy; 1827 1828 // If e is an id expression or a class member access, decltype(e) is defined 1829 // as the type of the entity named by e. 1830 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 1831 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 1832 return VD->getType(); 1833 } 1834 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 1835 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1836 return FD->getType(); 1837 } 1838 // If e is a function call or an invocation of an overloaded operator, 1839 // (parentheses around e are ignored), decltype(e) is defined as the 1840 // return type of that function. 1841 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 1842 return CE->getCallReturnType(); 1843 1844 QualType T = e->getType(); 1845 1846 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 1847 // defined as T&, otherwise decltype(e) is defined as T. 1848 if (e->isLvalue(Context) == Expr::LV_Valid) 1849 T = Context.getLValueReferenceType(T); 1850 1851 return T; 1852} 1853 1854/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 1855/// DecltypeType AST's. The only motivation to unique these nodes would be 1856/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 1857/// an issue. This doesn't effect the type checker, since it operates 1858/// on canonical type's (which are always unique). 1859QualType ASTContext::getDecltypeType(Expr *e) { 1860 DecltypeType *dt; 1861 if (e->isTypeDependent()) // FIXME: canonicalize the expression 1862 dt = new (*this, 8) DecltypeType(e, DependentTy); 1863 else { 1864 QualType T = getDecltypeForExpr(e, *this); 1865 dt = new (*this, 8) DecltypeType(e, T, getCanonicalType(T)); 1866 } 1867 Types.push_back(dt); 1868 return QualType(dt, 0); 1869} 1870 1871/// getTagDeclType - Return the unique reference to the type for the 1872/// specified TagDecl (struct/union/class/enum) decl. 1873QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1874 assert (Decl); 1875 return getTypeDeclType(Decl); 1876} 1877 1878/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1879/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1880/// needs to agree with the definition in <stddef.h>. 1881QualType ASTContext::getSizeType() const { 1882 return getFromTargetType(Target.getSizeType()); 1883} 1884 1885/// getSignedWCharType - Return the type of "signed wchar_t". 1886/// Used when in C++, as a GCC extension. 1887QualType ASTContext::getSignedWCharType() const { 1888 // FIXME: derive from "Target" ? 1889 return WCharTy; 1890} 1891 1892/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1893/// Used when in C++, as a GCC extension. 1894QualType ASTContext::getUnsignedWCharType() const { 1895 // FIXME: derive from "Target" ? 1896 return UnsignedIntTy; 1897} 1898 1899/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 1900/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 1901QualType ASTContext::getPointerDiffType() const { 1902 return getFromTargetType(Target.getPtrDiffType(0)); 1903} 1904 1905//===----------------------------------------------------------------------===// 1906// Type Operators 1907//===----------------------------------------------------------------------===// 1908 1909/// getCanonicalType - Return the canonical (structural) type corresponding to 1910/// the specified potentially non-canonical type. The non-canonical version 1911/// of a type may have many "decorated" versions of types. Decorators can 1912/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 1913/// to be free of any of these, allowing two canonical types to be compared 1914/// for exact equality with a simple pointer comparison. 1915QualType ASTContext::getCanonicalType(QualType T) { 1916 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 1917 1918 // If the result has type qualifiers, make sure to canonicalize them as well. 1919 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 1920 if (TypeQuals == 0) return CanType; 1921 1922 // If the type qualifiers are on an array type, get the canonical type of the 1923 // array with the qualifiers applied to the element type. 1924 ArrayType *AT = dyn_cast<ArrayType>(CanType); 1925 if (!AT) 1926 return CanType.getQualifiedType(TypeQuals); 1927 1928 // Get the canonical version of the element with the extra qualifiers on it. 1929 // This can recursively sink qualifiers through multiple levels of arrays. 1930 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 1931 NewEltTy = getCanonicalType(NewEltTy); 1932 1933 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1934 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 1935 CAT->getIndexTypeQualifier()); 1936 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 1937 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 1938 IAT->getIndexTypeQualifier()); 1939 1940 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 1941 return getDependentSizedArrayType(NewEltTy, 1942 DSAT->getSizeExpr(), 1943 DSAT->getSizeModifier(), 1944 DSAT->getIndexTypeQualifier(), 1945 DSAT->getBracketsRange()); 1946 1947 VariableArrayType *VAT = cast<VariableArrayType>(AT); 1948 return getVariableArrayType(NewEltTy, 1949 VAT->getSizeExpr(), 1950 VAT->getSizeModifier(), 1951 VAT->getIndexTypeQualifier(), 1952 VAT->getBracketsRange()); 1953} 1954 1955TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 1956 // If this template name refers to a template, the canonical 1957 // template name merely stores the template itself. 1958 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 1959 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 1960 1961 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 1962 assert(DTN && "Non-dependent template names must refer to template decls."); 1963 return DTN->CanonicalTemplateName; 1964} 1965 1966NestedNameSpecifier * 1967ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 1968 if (!NNS) 1969 return 0; 1970 1971 switch (NNS->getKind()) { 1972 case NestedNameSpecifier::Identifier: 1973 // Canonicalize the prefix but keep the identifier the same. 1974 return NestedNameSpecifier::Create(*this, 1975 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 1976 NNS->getAsIdentifier()); 1977 1978 case NestedNameSpecifier::Namespace: 1979 // A namespace is canonical; build a nested-name-specifier with 1980 // this namespace and no prefix. 1981 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 1982 1983 case NestedNameSpecifier::TypeSpec: 1984 case NestedNameSpecifier::TypeSpecWithTemplate: { 1985 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 1986 NestedNameSpecifier *Prefix = 0; 1987 1988 // FIXME: This isn't the right check! 1989 if (T->isDependentType()) 1990 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 1991 1992 return NestedNameSpecifier::Create(*this, Prefix, 1993 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 1994 T.getTypePtr()); 1995 } 1996 1997 case NestedNameSpecifier::Global: 1998 // The global specifier is canonical and unique. 1999 return NNS; 2000 } 2001 2002 // Required to silence a GCC warning 2003 return 0; 2004} 2005 2006 2007const ArrayType *ASTContext::getAsArrayType(QualType T) { 2008 // Handle the non-qualified case efficiently. 2009 if (T.getCVRQualifiers() == 0) { 2010 // Handle the common positive case fast. 2011 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2012 return AT; 2013 } 2014 2015 // Handle the common negative case fast, ignoring CVR qualifiers. 2016 QualType CType = T->getCanonicalTypeInternal(); 2017 2018 // Make sure to look through type qualifiers (like ExtQuals) for the negative 2019 // test. 2020 if (!isa<ArrayType>(CType) && 2021 !isa<ArrayType>(CType.getUnqualifiedType())) 2022 return 0; 2023 2024 // Apply any CVR qualifiers from the array type to the element type. This 2025 // implements C99 6.7.3p8: "If the specification of an array type includes 2026 // any type qualifiers, the element type is so qualified, not the array type." 2027 2028 // If we get here, we either have type qualifiers on the type, or we have 2029 // sugar such as a typedef in the way. If we have type qualifiers on the type 2030 // we must propagate them down into the elemeng type. 2031 unsigned CVRQuals = T.getCVRQualifiers(); 2032 unsigned AddrSpace = 0; 2033 Type *Ty = T.getTypePtr(); 2034 2035 // Rip through ExtQualType's and typedefs to get to a concrete type. 2036 while (1) { 2037 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 2038 AddrSpace = EXTQT->getAddressSpace(); 2039 Ty = EXTQT->getBaseType(); 2040 } else { 2041 T = Ty->getDesugaredType(); 2042 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 2043 break; 2044 CVRQuals |= T.getCVRQualifiers(); 2045 Ty = T.getTypePtr(); 2046 } 2047 } 2048 2049 // If we have a simple case, just return now. 2050 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2051 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 2052 return ATy; 2053 2054 // Otherwise, we have an array and we have qualifiers on it. Push the 2055 // qualifiers into the array element type and return a new array type. 2056 // Get the canonical version of the element with the extra qualifiers on it. 2057 // This can recursively sink qualifiers through multiple levels of arrays. 2058 QualType NewEltTy = ATy->getElementType(); 2059 if (AddrSpace) 2060 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 2061 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 2062 2063 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2064 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2065 CAT->getSizeModifier(), 2066 CAT->getIndexTypeQualifier())); 2067 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2068 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2069 IAT->getSizeModifier(), 2070 IAT->getIndexTypeQualifier())); 2071 2072 if (const DependentSizedArrayType *DSAT 2073 = dyn_cast<DependentSizedArrayType>(ATy)) 2074 return cast<ArrayType>( 2075 getDependentSizedArrayType(NewEltTy, 2076 DSAT->getSizeExpr(), 2077 DSAT->getSizeModifier(), 2078 DSAT->getIndexTypeQualifier(), 2079 DSAT->getBracketsRange())); 2080 2081 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2082 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2083 VAT->getSizeExpr(), 2084 VAT->getSizeModifier(), 2085 VAT->getIndexTypeQualifier(), 2086 VAT->getBracketsRange())); 2087} 2088 2089 2090/// getArrayDecayedType - Return the properly qualified result of decaying the 2091/// specified array type to a pointer. This operation is non-trivial when 2092/// handling typedefs etc. The canonical type of "T" must be an array type, 2093/// this returns a pointer to a properly qualified element of the array. 2094/// 2095/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2096QualType ASTContext::getArrayDecayedType(QualType Ty) { 2097 // Get the element type with 'getAsArrayType' so that we don't lose any 2098 // typedefs in the element type of the array. This also handles propagation 2099 // of type qualifiers from the array type into the element type if present 2100 // (C99 6.7.3p8). 2101 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2102 assert(PrettyArrayType && "Not an array type!"); 2103 2104 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2105 2106 // int x[restrict 4] -> int *restrict 2107 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 2108} 2109 2110QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 2111 QualType ElemTy = VAT->getElementType(); 2112 2113 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 2114 return getBaseElementType(VAT); 2115 2116 return ElemTy; 2117} 2118 2119/// getFloatingRank - Return a relative rank for floating point types. 2120/// This routine will assert if passed a built-in type that isn't a float. 2121static FloatingRank getFloatingRank(QualType T) { 2122 if (const ComplexType *CT = T->getAsComplexType()) 2123 return getFloatingRank(CT->getElementType()); 2124 2125 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 2126 switch (T->getAsBuiltinType()->getKind()) { 2127 default: assert(0 && "getFloatingRank(): not a floating type"); 2128 case BuiltinType::Float: return FloatRank; 2129 case BuiltinType::Double: return DoubleRank; 2130 case BuiltinType::LongDouble: return LongDoubleRank; 2131 } 2132} 2133 2134/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2135/// point or a complex type (based on typeDomain/typeSize). 2136/// 'typeDomain' is a real floating point or complex type. 2137/// 'typeSize' is a real floating point or complex type. 2138QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2139 QualType Domain) const { 2140 FloatingRank EltRank = getFloatingRank(Size); 2141 if (Domain->isComplexType()) { 2142 switch (EltRank) { 2143 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2144 case FloatRank: return FloatComplexTy; 2145 case DoubleRank: return DoubleComplexTy; 2146 case LongDoubleRank: return LongDoubleComplexTy; 2147 } 2148 } 2149 2150 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2151 switch (EltRank) { 2152 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2153 case FloatRank: return FloatTy; 2154 case DoubleRank: return DoubleTy; 2155 case LongDoubleRank: return LongDoubleTy; 2156 } 2157} 2158 2159/// getFloatingTypeOrder - Compare the rank of the two specified floating 2160/// point types, ignoring the domain of the type (i.e. 'double' == 2161/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2162/// LHS < RHS, return -1. 2163int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2164 FloatingRank LHSR = getFloatingRank(LHS); 2165 FloatingRank RHSR = getFloatingRank(RHS); 2166 2167 if (LHSR == RHSR) 2168 return 0; 2169 if (LHSR > RHSR) 2170 return 1; 2171 return -1; 2172} 2173 2174/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2175/// routine will assert if passed a built-in type that isn't an integer or enum, 2176/// or if it is not canonicalized. 2177unsigned ASTContext::getIntegerRank(Type *T) { 2178 assert(T->isCanonical() && "T should be canonicalized"); 2179 if (EnumType* ET = dyn_cast<EnumType>(T)) 2180 T = ET->getDecl()->getIntegerType().getTypePtr(); 2181 2182 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2183 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2184 2185 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2186 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2187 2188 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2189 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2190 2191 // There are two things which impact the integer rank: the width, and 2192 // the ordering of builtins. The builtin ordering is encoded in the 2193 // bottom three bits; the width is encoded in the bits above that. 2194 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2195 return FWIT->getWidth() << 3; 2196 2197 switch (cast<BuiltinType>(T)->getKind()) { 2198 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2199 case BuiltinType::Bool: 2200 return 1 + (getIntWidth(BoolTy) << 3); 2201 case BuiltinType::Char_S: 2202 case BuiltinType::Char_U: 2203 case BuiltinType::SChar: 2204 case BuiltinType::UChar: 2205 return 2 + (getIntWidth(CharTy) << 3); 2206 case BuiltinType::Short: 2207 case BuiltinType::UShort: 2208 return 3 + (getIntWidth(ShortTy) << 3); 2209 case BuiltinType::Int: 2210 case BuiltinType::UInt: 2211 return 4 + (getIntWidth(IntTy) << 3); 2212 case BuiltinType::Long: 2213 case BuiltinType::ULong: 2214 return 5 + (getIntWidth(LongTy) << 3); 2215 case BuiltinType::LongLong: 2216 case BuiltinType::ULongLong: 2217 return 6 + (getIntWidth(LongLongTy) << 3); 2218 case BuiltinType::Int128: 2219 case BuiltinType::UInt128: 2220 return 7 + (getIntWidth(Int128Ty) << 3); 2221 } 2222} 2223 2224/// getIntegerTypeOrder - Returns the highest ranked integer type: 2225/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2226/// LHS < RHS, return -1. 2227int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2228 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2229 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2230 if (LHSC == RHSC) return 0; 2231 2232 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2233 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2234 2235 unsigned LHSRank = getIntegerRank(LHSC); 2236 unsigned RHSRank = getIntegerRank(RHSC); 2237 2238 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2239 if (LHSRank == RHSRank) return 0; 2240 return LHSRank > RHSRank ? 1 : -1; 2241 } 2242 2243 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2244 if (LHSUnsigned) { 2245 // If the unsigned [LHS] type is larger, return it. 2246 if (LHSRank >= RHSRank) 2247 return 1; 2248 2249 // If the signed type can represent all values of the unsigned type, it 2250 // wins. Because we are dealing with 2's complement and types that are 2251 // powers of two larger than each other, this is always safe. 2252 return -1; 2253 } 2254 2255 // If the unsigned [RHS] type is larger, return it. 2256 if (RHSRank >= LHSRank) 2257 return -1; 2258 2259 // If the signed type can represent all values of the unsigned type, it 2260 // wins. Because we are dealing with 2's complement and types that are 2261 // powers of two larger than each other, this is always safe. 2262 return 1; 2263} 2264 2265// getCFConstantStringType - Return the type used for constant CFStrings. 2266QualType ASTContext::getCFConstantStringType() { 2267 if (!CFConstantStringTypeDecl) { 2268 CFConstantStringTypeDecl = 2269 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2270 &Idents.get("NSConstantString")); 2271 QualType FieldTypes[4]; 2272 2273 // const int *isa; 2274 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2275 // int flags; 2276 FieldTypes[1] = IntTy; 2277 // const char *str; 2278 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2279 // long length; 2280 FieldTypes[3] = LongTy; 2281 2282 // Create fields 2283 for (unsigned i = 0; i < 4; ++i) { 2284 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2285 SourceLocation(), 0, 2286 FieldTypes[i], /*BitWidth=*/0, 2287 /*Mutable=*/false); 2288 CFConstantStringTypeDecl->addDecl(Field); 2289 } 2290 2291 CFConstantStringTypeDecl->completeDefinition(*this); 2292 } 2293 2294 return getTagDeclType(CFConstantStringTypeDecl); 2295} 2296 2297void ASTContext::setCFConstantStringType(QualType T) { 2298 const RecordType *Rec = T->getAsRecordType(); 2299 assert(Rec && "Invalid CFConstantStringType"); 2300 CFConstantStringTypeDecl = Rec->getDecl(); 2301} 2302 2303QualType ASTContext::getObjCFastEnumerationStateType() 2304{ 2305 if (!ObjCFastEnumerationStateTypeDecl) { 2306 ObjCFastEnumerationStateTypeDecl = 2307 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2308 &Idents.get("__objcFastEnumerationState")); 2309 2310 QualType FieldTypes[] = { 2311 UnsignedLongTy, 2312 getPointerType(ObjCIdTypedefType), 2313 getPointerType(UnsignedLongTy), 2314 getConstantArrayType(UnsignedLongTy, 2315 llvm::APInt(32, 5), ArrayType::Normal, 0) 2316 }; 2317 2318 for (size_t i = 0; i < 4; ++i) { 2319 FieldDecl *Field = FieldDecl::Create(*this, 2320 ObjCFastEnumerationStateTypeDecl, 2321 SourceLocation(), 0, 2322 FieldTypes[i], /*BitWidth=*/0, 2323 /*Mutable=*/false); 2324 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2325 } 2326 2327 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2328 } 2329 2330 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2331} 2332 2333void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2334 const RecordType *Rec = T->getAsRecordType(); 2335 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2336 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2337} 2338 2339// This returns true if a type has been typedefed to BOOL: 2340// typedef <type> BOOL; 2341static bool isTypeTypedefedAsBOOL(QualType T) { 2342 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2343 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2344 return II->isStr("BOOL"); 2345 2346 return false; 2347} 2348 2349/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2350/// purpose. 2351int ASTContext::getObjCEncodingTypeSize(QualType type) { 2352 uint64_t sz = getTypeSize(type); 2353 2354 // Make all integer and enum types at least as large as an int 2355 if (sz > 0 && type->isIntegralType()) 2356 sz = std::max(sz, getTypeSize(IntTy)); 2357 // Treat arrays as pointers, since that's how they're passed in. 2358 else if (type->isArrayType()) 2359 sz = getTypeSize(VoidPtrTy); 2360 return sz / getTypeSize(CharTy); 2361} 2362 2363/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2364/// declaration. 2365void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2366 std::string& S) { 2367 // FIXME: This is not very efficient. 2368 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2369 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2370 // Encode result type. 2371 getObjCEncodingForType(Decl->getResultType(), S); 2372 // Compute size of all parameters. 2373 // Start with computing size of a pointer in number of bytes. 2374 // FIXME: There might(should) be a better way of doing this computation! 2375 SourceLocation Loc; 2376 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2377 // The first two arguments (self and _cmd) are pointers; account for 2378 // their size. 2379 int ParmOffset = 2 * PtrSize; 2380 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2381 E = Decl->param_end(); PI != E; ++PI) { 2382 QualType PType = (*PI)->getType(); 2383 int sz = getObjCEncodingTypeSize(PType); 2384 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2385 ParmOffset += sz; 2386 } 2387 S += llvm::utostr(ParmOffset); 2388 S += "@0:"; 2389 S += llvm::utostr(PtrSize); 2390 2391 // Argument types. 2392 ParmOffset = 2 * PtrSize; 2393 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2394 E = Decl->param_end(); PI != E; ++PI) { 2395 ParmVarDecl *PVDecl = *PI; 2396 QualType PType = PVDecl->getOriginalType(); 2397 if (const ArrayType *AT = 2398 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2399 // Use array's original type only if it has known number of 2400 // elements. 2401 if (!isa<ConstantArrayType>(AT)) 2402 PType = PVDecl->getType(); 2403 } else if (PType->isFunctionType()) 2404 PType = PVDecl->getType(); 2405 // Process argument qualifiers for user supplied arguments; such as, 2406 // 'in', 'inout', etc. 2407 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2408 getObjCEncodingForType(PType, S); 2409 S += llvm::utostr(ParmOffset); 2410 ParmOffset += getObjCEncodingTypeSize(PType); 2411 } 2412} 2413 2414/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2415/// property declaration. If non-NULL, Container must be either an 2416/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2417/// NULL when getting encodings for protocol properties. 2418/// Property attributes are stored as a comma-delimited C string. The simple 2419/// attributes readonly and bycopy are encoded as single characters. The 2420/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2421/// encoded as single characters, followed by an identifier. Property types 2422/// are also encoded as a parametrized attribute. The characters used to encode 2423/// these attributes are defined by the following enumeration: 2424/// @code 2425/// enum PropertyAttributes { 2426/// kPropertyReadOnly = 'R', // property is read-only. 2427/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2428/// kPropertyByref = '&', // property is a reference to the value last assigned 2429/// kPropertyDynamic = 'D', // property is dynamic 2430/// kPropertyGetter = 'G', // followed by getter selector name 2431/// kPropertySetter = 'S', // followed by setter selector name 2432/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2433/// kPropertyType = 't' // followed by old-style type encoding. 2434/// kPropertyWeak = 'W' // 'weak' property 2435/// kPropertyStrong = 'P' // property GC'able 2436/// kPropertyNonAtomic = 'N' // property non-atomic 2437/// }; 2438/// @endcode 2439void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2440 const Decl *Container, 2441 std::string& S) { 2442 // Collect information from the property implementation decl(s). 2443 bool Dynamic = false; 2444 ObjCPropertyImplDecl *SynthesizePID = 0; 2445 2446 // FIXME: Duplicated code due to poor abstraction. 2447 if (Container) { 2448 if (const ObjCCategoryImplDecl *CID = 2449 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2450 for (ObjCCategoryImplDecl::propimpl_iterator 2451 i = CID->propimpl_begin(), e = CID->propimpl_end(); 2452 i != e; ++i) { 2453 ObjCPropertyImplDecl *PID = *i; 2454 if (PID->getPropertyDecl() == PD) { 2455 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2456 Dynamic = true; 2457 } else { 2458 SynthesizePID = PID; 2459 } 2460 } 2461 } 2462 } else { 2463 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2464 for (ObjCCategoryImplDecl::propimpl_iterator 2465 i = OID->propimpl_begin(), e = OID->propimpl_end(); 2466 i != e; ++i) { 2467 ObjCPropertyImplDecl *PID = *i; 2468 if (PID->getPropertyDecl() == PD) { 2469 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2470 Dynamic = true; 2471 } else { 2472 SynthesizePID = PID; 2473 } 2474 } 2475 } 2476 } 2477 } 2478 2479 // FIXME: This is not very efficient. 2480 S = "T"; 2481 2482 // Encode result type. 2483 // GCC has some special rules regarding encoding of properties which 2484 // closely resembles encoding of ivars. 2485 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2486 true /* outermost type */, 2487 true /* encoding for property */); 2488 2489 if (PD->isReadOnly()) { 2490 S += ",R"; 2491 } else { 2492 switch (PD->getSetterKind()) { 2493 case ObjCPropertyDecl::Assign: break; 2494 case ObjCPropertyDecl::Copy: S += ",C"; break; 2495 case ObjCPropertyDecl::Retain: S += ",&"; break; 2496 } 2497 } 2498 2499 // It really isn't clear at all what this means, since properties 2500 // are "dynamic by default". 2501 if (Dynamic) 2502 S += ",D"; 2503 2504 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2505 S += ",N"; 2506 2507 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2508 S += ",G"; 2509 S += PD->getGetterName().getAsString(); 2510 } 2511 2512 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2513 S += ",S"; 2514 S += PD->getSetterName().getAsString(); 2515 } 2516 2517 if (SynthesizePID) { 2518 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2519 S += ",V"; 2520 S += OID->getNameAsString(); 2521 } 2522 2523 // FIXME: OBJCGC: weak & strong 2524} 2525 2526/// getLegacyIntegralTypeEncoding - 2527/// Another legacy compatibility encoding: 32-bit longs are encoded as 2528/// 'l' or 'L' , but not always. For typedefs, we need to use 2529/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2530/// 2531void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2532 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 2533 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2534 if (BT->getKind() == BuiltinType::ULong && 2535 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2536 PointeeTy = UnsignedIntTy; 2537 else 2538 if (BT->getKind() == BuiltinType::Long && 2539 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2540 PointeeTy = IntTy; 2541 } 2542 } 2543} 2544 2545void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2546 const FieldDecl *Field) { 2547 // We follow the behavior of gcc, expanding structures which are 2548 // directly pointed to, and expanding embedded structures. Note that 2549 // these rules are sufficient to prevent recursive encoding of the 2550 // same type. 2551 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2552 true /* outermost type */); 2553} 2554 2555static void EncodeBitField(const ASTContext *Context, std::string& S, 2556 const FieldDecl *FD) { 2557 const Expr *E = FD->getBitWidth(); 2558 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2559 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2560 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2561 S += 'b'; 2562 S += llvm::utostr(N); 2563} 2564 2565void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2566 bool ExpandPointedToStructures, 2567 bool ExpandStructures, 2568 const FieldDecl *FD, 2569 bool OutermostType, 2570 bool EncodingProperty) { 2571 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2572 if (FD && FD->isBitField()) 2573 return EncodeBitField(this, S, FD); 2574 char encoding; 2575 switch (BT->getKind()) { 2576 default: assert(0 && "Unhandled builtin type kind"); 2577 case BuiltinType::Void: encoding = 'v'; break; 2578 case BuiltinType::Bool: encoding = 'B'; break; 2579 case BuiltinType::Char_U: 2580 case BuiltinType::UChar: encoding = 'C'; break; 2581 case BuiltinType::UShort: encoding = 'S'; break; 2582 case BuiltinType::UInt: encoding = 'I'; break; 2583 case BuiltinType::ULong: 2584 encoding = 2585 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2586 break; 2587 case BuiltinType::UInt128: encoding = 'T'; break; 2588 case BuiltinType::ULongLong: encoding = 'Q'; break; 2589 case BuiltinType::Char_S: 2590 case BuiltinType::SChar: encoding = 'c'; break; 2591 case BuiltinType::Short: encoding = 's'; break; 2592 case BuiltinType::Int: encoding = 'i'; break; 2593 case BuiltinType::Long: 2594 encoding = 2595 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2596 break; 2597 case BuiltinType::LongLong: encoding = 'q'; break; 2598 case BuiltinType::Int128: encoding = 't'; break; 2599 case BuiltinType::Float: encoding = 'f'; break; 2600 case BuiltinType::Double: encoding = 'd'; break; 2601 case BuiltinType::LongDouble: encoding = 'd'; break; 2602 } 2603 2604 S += encoding; 2605 return; 2606 } 2607 2608 if (const ComplexType *CT = T->getAsComplexType()) { 2609 S += 'j'; 2610 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2611 false); 2612 return; 2613 } 2614 2615 if (const PointerType *PT = T->getAsPointerType()) { 2616 QualType PointeeTy = PT->getPointeeType(); 2617 bool isReadOnly = false; 2618 // For historical/compatibility reasons, the read-only qualifier of the 2619 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2620 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2621 // Also, do not emit the 'r' for anything but the outermost type! 2622 if (isa<TypedefType>(T.getTypePtr())) { 2623 if (OutermostType && T.isConstQualified()) { 2624 isReadOnly = true; 2625 S += 'r'; 2626 } 2627 } 2628 else if (OutermostType) { 2629 QualType P = PointeeTy; 2630 while (P->getAsPointerType()) 2631 P = P->getAsPointerType()->getPointeeType(); 2632 if (P.isConstQualified()) { 2633 isReadOnly = true; 2634 S += 'r'; 2635 } 2636 } 2637 if (isReadOnly) { 2638 // Another legacy compatibility encoding. Some ObjC qualifier and type 2639 // combinations need to be rearranged. 2640 // Rewrite "in const" from "nr" to "rn" 2641 const char * s = S.c_str(); 2642 int len = S.length(); 2643 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2644 std::string replace = "rn"; 2645 S.replace(S.end()-2, S.end(), replace); 2646 } 2647 } 2648 if (isObjCSelType(PointeeTy)) { 2649 S += ':'; 2650 return; 2651 } 2652 2653 if (PointeeTy->isCharType()) { 2654 // char pointer types should be encoded as '*' unless it is a 2655 // type that has been typedef'd to 'BOOL'. 2656 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2657 S += '*'; 2658 return; 2659 } 2660 } else if (const RecordType *RTy = PointeeTy->getAsRecordType()) { 2661 // GCC binary compat: Need to convert "struct objc_class *" to "#". 2662 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 2663 S += '#'; 2664 return; 2665 } 2666 // GCC binary compat: Need to convert "struct objc_object *" to "@". 2667 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 2668 S += '@'; 2669 return; 2670 } 2671 // fall through... 2672 } 2673 S += '^'; 2674 getLegacyIntegralTypeEncoding(PointeeTy); 2675 2676 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 2677 NULL); 2678 return; 2679 } 2680 2681 if (const ArrayType *AT = 2682 // Ignore type qualifiers etc. 2683 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2684 if (isa<IncompleteArrayType>(AT)) { 2685 // Incomplete arrays are encoded as a pointer to the array element. 2686 S += '^'; 2687 2688 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2689 false, ExpandStructures, FD); 2690 } else { 2691 S += '['; 2692 2693 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2694 S += llvm::utostr(CAT->getSize().getZExtValue()); 2695 else { 2696 //Variable length arrays are encoded as a regular array with 0 elements. 2697 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2698 S += '0'; 2699 } 2700 2701 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2702 false, ExpandStructures, FD); 2703 S += ']'; 2704 } 2705 return; 2706 } 2707 2708 if (T->getAsFunctionType()) { 2709 S += '?'; 2710 return; 2711 } 2712 2713 if (const RecordType *RTy = T->getAsRecordType()) { 2714 RecordDecl *RDecl = RTy->getDecl(); 2715 S += RDecl->isUnion() ? '(' : '{'; 2716 // Anonymous structures print as '?' 2717 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2718 S += II->getName(); 2719 } else { 2720 S += '?'; 2721 } 2722 if (ExpandStructures) { 2723 S += '='; 2724 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 2725 FieldEnd = RDecl->field_end(); 2726 Field != FieldEnd; ++Field) { 2727 if (FD) { 2728 S += '"'; 2729 S += Field->getNameAsString(); 2730 S += '"'; 2731 } 2732 2733 // Special case bit-fields. 2734 if (Field->isBitField()) { 2735 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2736 (*Field)); 2737 } else { 2738 QualType qt = Field->getType(); 2739 getLegacyIntegralTypeEncoding(qt); 2740 getObjCEncodingForTypeImpl(qt, S, false, true, 2741 FD); 2742 } 2743 } 2744 } 2745 S += RDecl->isUnion() ? ')' : '}'; 2746 return; 2747 } 2748 2749 if (T->isEnumeralType()) { 2750 if (FD && FD->isBitField()) 2751 EncodeBitField(this, S, FD); 2752 else 2753 S += 'i'; 2754 return; 2755 } 2756 2757 if (T->isBlockPointerType()) { 2758 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2759 return; 2760 } 2761 2762 if (T->isObjCInterfaceType()) { 2763 // @encode(class_name) 2764 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2765 S += '{'; 2766 const IdentifierInfo *II = OI->getIdentifier(); 2767 S += II->getName(); 2768 S += '='; 2769 llvm::SmallVector<FieldDecl*, 32> RecFields; 2770 CollectObjCIvars(OI, RecFields); 2771 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2772 if (RecFields[i]->isBitField()) 2773 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2774 RecFields[i]); 2775 else 2776 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2777 FD); 2778 } 2779 S += '}'; 2780 return; 2781 } 2782 2783 if (const ObjCObjectPointerType *OPT = T->getAsObjCObjectPointerType()) { 2784 if (OPT->isObjCIdType()) { 2785 S += '@'; 2786 return; 2787 } 2788 2789 if (OPT->isObjCClassType()) { 2790 S += '#'; 2791 return; 2792 } 2793 2794 if (OPT->isObjCQualifiedIdType()) { 2795 getObjCEncodingForTypeImpl(getObjCIdType(), S, 2796 ExpandPointedToStructures, 2797 ExpandStructures, FD); 2798 if (FD || EncodingProperty) { 2799 // Note that we do extended encoding of protocol qualifer list 2800 // Only when doing ivar or property encoding. 2801 S += '"'; 2802 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2803 E = OPT->qual_end(); I != E; ++I) { 2804 S += '<'; 2805 S += (*I)->getNameAsString(); 2806 S += '>'; 2807 } 2808 S += '"'; 2809 } 2810 return; 2811 } 2812 2813 QualType PointeeTy = OPT->getPointeeType(); 2814 if (!EncodingProperty && 2815 isa<TypedefType>(PointeeTy.getTypePtr())) { 2816 // Another historical/compatibility reason. 2817 // We encode the underlying type which comes out as 2818 // {...}; 2819 S += '^'; 2820 getObjCEncodingForTypeImpl(PointeeTy, S, 2821 false, ExpandPointedToStructures, 2822 NULL); 2823 return; 2824 } 2825 2826 S += '@'; 2827 if (FD || EncodingProperty) { 2828 S += '"'; 2829 S += OPT->getInterfaceDecl()->getNameAsCString(); 2830 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2831 E = OPT->qual_end(); I != E; ++I) { 2832 S += '<'; 2833 S += (*I)->getNameAsString(); 2834 S += '>'; 2835 } 2836 S += '"'; 2837 } 2838 return; 2839 } 2840 2841 assert(0 && "@encode for type not implemented!"); 2842} 2843 2844void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2845 std::string& S) const { 2846 if (QT & Decl::OBJC_TQ_In) 2847 S += 'n'; 2848 if (QT & Decl::OBJC_TQ_Inout) 2849 S += 'N'; 2850 if (QT & Decl::OBJC_TQ_Out) 2851 S += 'o'; 2852 if (QT & Decl::OBJC_TQ_Bycopy) 2853 S += 'O'; 2854 if (QT & Decl::OBJC_TQ_Byref) 2855 S += 'R'; 2856 if (QT & Decl::OBJC_TQ_Oneway) 2857 S += 'V'; 2858} 2859 2860void ASTContext::setBuiltinVaListType(QualType T) { 2861 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2862 2863 BuiltinVaListType = T; 2864} 2865 2866void ASTContext::setObjCIdType(QualType T) { 2867 ObjCIdTypedefType = T; 2868} 2869 2870void ASTContext::setObjCSelType(QualType T) { 2871 ObjCSelType = T; 2872 2873 const TypedefType *TT = T->getAsTypedefType(); 2874 if (!TT) 2875 return; 2876 TypedefDecl *TD = TT->getDecl(); 2877 2878 // typedef struct objc_selector *SEL; 2879 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2880 if (!ptr) 2881 return; 2882 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2883 if (!rec) 2884 return; 2885 SelStructType = rec; 2886} 2887 2888void ASTContext::setObjCProtoType(QualType QT) { 2889 ObjCProtoType = QT; 2890} 2891 2892void ASTContext::setObjCClassType(QualType T) { 2893 ObjCClassTypedefType = T; 2894} 2895 2896void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 2897 assert(ObjCConstantStringType.isNull() && 2898 "'NSConstantString' type already set!"); 2899 2900 ObjCConstantStringType = getObjCInterfaceType(Decl); 2901} 2902 2903/// \brief Retrieve the template name that represents a qualified 2904/// template name such as \c std::vector. 2905TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 2906 bool TemplateKeyword, 2907 TemplateDecl *Template) { 2908 llvm::FoldingSetNodeID ID; 2909 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 2910 2911 void *InsertPos = 0; 2912 QualifiedTemplateName *QTN = 2913 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2914 if (!QTN) { 2915 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 2916 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 2917 } 2918 2919 return TemplateName(QTN); 2920} 2921 2922/// \brief Retrieve the template name that represents a dependent 2923/// template name such as \c MetaFun::template apply. 2924TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 2925 const IdentifierInfo *Name) { 2926 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 2927 2928 llvm::FoldingSetNodeID ID; 2929 DependentTemplateName::Profile(ID, NNS, Name); 2930 2931 void *InsertPos = 0; 2932 DependentTemplateName *QTN = 2933 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2934 2935 if (QTN) 2936 return TemplateName(QTN); 2937 2938 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2939 if (CanonNNS == NNS) { 2940 QTN = new (*this,4) DependentTemplateName(NNS, Name); 2941 } else { 2942 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 2943 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 2944 } 2945 2946 DependentTemplateNames.InsertNode(QTN, InsertPos); 2947 return TemplateName(QTN); 2948} 2949 2950/// getFromTargetType - Given one of the integer types provided by 2951/// TargetInfo, produce the corresponding type. The unsigned @p Type 2952/// is actually a value of type @c TargetInfo::IntType. 2953QualType ASTContext::getFromTargetType(unsigned Type) const { 2954 switch (Type) { 2955 case TargetInfo::NoInt: return QualType(); 2956 case TargetInfo::SignedShort: return ShortTy; 2957 case TargetInfo::UnsignedShort: return UnsignedShortTy; 2958 case TargetInfo::SignedInt: return IntTy; 2959 case TargetInfo::UnsignedInt: return UnsignedIntTy; 2960 case TargetInfo::SignedLong: return LongTy; 2961 case TargetInfo::UnsignedLong: return UnsignedLongTy; 2962 case TargetInfo::SignedLongLong: return LongLongTy; 2963 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 2964 } 2965 2966 assert(false && "Unhandled TargetInfo::IntType value"); 2967 return QualType(); 2968} 2969 2970//===----------------------------------------------------------------------===// 2971// Type Predicates. 2972//===----------------------------------------------------------------------===// 2973 2974/// isObjCNSObjectType - Return true if this is an NSObject object using 2975/// NSObject attribute on a c-style pointer type. 2976/// FIXME - Make it work directly on types. 2977/// FIXME: Move to Type. 2978/// 2979bool ASTContext::isObjCNSObjectType(QualType Ty) const { 2980 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2981 if (TypedefDecl *TD = TDT->getDecl()) 2982 if (TD->getAttr<ObjCNSObjectAttr>()) 2983 return true; 2984 } 2985 return false; 2986} 2987 2988/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 2989/// garbage collection attribute. 2990/// 2991QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 2992 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 2993 if (getLangOptions().ObjC1 && 2994 getLangOptions().getGCMode() != LangOptions::NonGC) { 2995 GCAttrs = Ty.getObjCGCAttr(); 2996 // Default behavious under objective-c's gc is for objective-c pointers 2997 // (or pointers to them) be treated as though they were declared 2998 // as __strong. 2999 if (GCAttrs == QualType::GCNone) { 3000 if (Ty->isObjCObjectPointerType()) 3001 GCAttrs = QualType::Strong; 3002 else if (Ty->isPointerType()) 3003 return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType()); 3004 } 3005 // Non-pointers have none gc'able attribute regardless of the attribute 3006 // set on them. 3007 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3008 return QualType::GCNone; 3009 } 3010 return GCAttrs; 3011} 3012 3013//===----------------------------------------------------------------------===// 3014// Type Compatibility Testing 3015//===----------------------------------------------------------------------===// 3016 3017/// areCompatVectorTypes - Return true if the two specified vector types are 3018/// compatible. 3019static bool areCompatVectorTypes(const VectorType *LHS, 3020 const VectorType *RHS) { 3021 assert(LHS->isCanonical() && RHS->isCanonical()); 3022 return LHS->getElementType() == RHS->getElementType() && 3023 LHS->getNumElements() == RHS->getNumElements(); 3024} 3025 3026//===----------------------------------------------------------------------===// 3027// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3028//===----------------------------------------------------------------------===// 3029 3030/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3031/// inheritance hierarchy of 'rProto'. 3032static bool ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3033 ObjCProtocolDecl *rProto) { 3034 if (lProto == rProto) 3035 return true; 3036 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3037 E = rProto->protocol_end(); PI != E; ++PI) 3038 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3039 return true; 3040 return false; 3041} 3042 3043/// ClassImplementsProtocol - Checks that 'lProto' protocol 3044/// has been implemented in IDecl class, its super class or categories (if 3045/// lookupCategory is true). 3046static bool ClassImplementsProtocol(ObjCProtocolDecl *lProto, 3047 ObjCInterfaceDecl *IDecl, 3048 bool lookupCategory, 3049 bool RHSIsQualifiedID = false) { 3050 3051 // 1st, look up the class. 3052 const ObjCList<ObjCProtocolDecl> &Protocols = 3053 IDecl->getReferencedProtocols(); 3054 3055 for (ObjCList<ObjCProtocolDecl>::iterator PI = Protocols.begin(), 3056 E = Protocols.end(); PI != E; ++PI) { 3057 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3058 return true; 3059 // This is dubious and is added to be compatible with gcc. In gcc, it is 3060 // also allowed assigning a protocol-qualified 'id' type to a LHS object 3061 // when protocol in qualified LHS is in list of protocols in the rhs 'id' 3062 // object. This IMO, should be a bug. 3063 // FIXME: Treat this as an extension, and flag this as an error when GCC 3064 // extensions are not enabled. 3065 if (RHSIsQualifiedID && ProtocolCompatibleWithProtocol(*PI, lProto)) 3066 return true; 3067 } 3068 3069 // 2nd, look up the category. 3070 if (lookupCategory) 3071 for (ObjCCategoryDecl *CDecl = IDecl->getCategoryList(); CDecl; 3072 CDecl = CDecl->getNextClassCategory()) { 3073 for (ObjCCategoryDecl::protocol_iterator PI = CDecl->protocol_begin(), 3074 E = CDecl->protocol_end(); PI != E; ++PI) 3075 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3076 return true; 3077 } 3078 3079 // 3rd, look up the super class(s) 3080 if (IDecl->getSuperClass()) 3081 return 3082 ClassImplementsProtocol(lProto, IDecl->getSuperClass(), lookupCategory, 3083 RHSIsQualifiedID); 3084 3085 return false; 3086} 3087 3088/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3089/// return true if lhs's protocols conform to rhs's protocol; false 3090/// otherwise. 3091bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3092 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3093 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3094 return false; 3095} 3096 3097/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3098/// ObjCQualifiedIDType. 3099bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3100 bool compare) { 3101 // Allow id<P..> and an 'id' or void* type in all cases. 3102 if (lhs->isVoidPointerType() || 3103 lhs->isObjCIdType() || lhs->isObjCClassType()) 3104 return true; 3105 else if (rhs->isVoidPointerType() || 3106 rhs->isObjCIdType() || rhs->isObjCClassType()) 3107 return true; 3108 3109 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3110 const ObjCObjectPointerType *rhsOPT = rhs->getAsObjCObjectPointerType(); 3111 3112 if (!rhsOPT) return false; 3113 3114 if (rhsOPT->qual_empty()) { 3115 // If the RHS is a unqualified interface pointer "NSString*", 3116 // make sure we check the class hierarchy. 3117 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3118 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3119 E = lhsQID->qual_end(); I != E; ++I) { 3120 // when comparing an id<P> on lhs with a static type on rhs, 3121 // see if static class implements all of id's protocols, directly or 3122 // through its super class and categories. 3123 if (!ClassImplementsProtocol(*I, rhsID, true)) 3124 return false; 3125 } 3126 } 3127 // If there are no qualifiers and no interface, we have an 'id'. 3128 return true; 3129 } 3130 // Both the right and left sides have qualifiers. 3131 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3132 E = lhsQID->qual_end(); I != E; ++I) { 3133 ObjCProtocolDecl *lhsProto = *I; 3134 bool match = false; 3135 3136 // when comparing an id<P> on lhs with a static type on rhs, 3137 // see if static class implements all of id's protocols, directly or 3138 // through its super class and categories. 3139 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3140 E = rhsOPT->qual_end(); J != E; ++J) { 3141 ObjCProtocolDecl *rhsProto = *J; 3142 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3143 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3144 match = true; 3145 break; 3146 } 3147 } 3148 // If the RHS is a qualified interface pointer "NSString<P>*", 3149 // make sure we check the class hierarchy. 3150 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3151 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3152 E = lhsQID->qual_end(); I != E; ++I) { 3153 // when comparing an id<P> on lhs with a static type on rhs, 3154 // see if static class implements all of id's protocols, directly or 3155 // through its super class and categories. 3156 if (ClassImplementsProtocol(*I, rhsID, true)) { 3157 match = true; 3158 break; 3159 } 3160 } 3161 } 3162 if (!match) 3163 return false; 3164 } 3165 3166 return true; 3167 } 3168 3169 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3170 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3171 3172 if (const ObjCObjectPointerType *lhsOPT = 3173 lhs->getAsObjCInterfacePointerType()) { 3174 if (lhsOPT->qual_empty()) { 3175 bool match = false; 3176 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3177 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3178 E = rhsQID->qual_end(); I != E; ++I) { 3179 // when comparing an id<P> on lhs with a static type on rhs, 3180 // see if static class implements all of id's protocols, directly or 3181 // through its super class and categories. 3182 if (ClassImplementsProtocol(*I, lhsID, true)) { 3183 match = true; 3184 break; 3185 } 3186 } 3187 if (!match) 3188 return false; 3189 } 3190 return true; 3191 } 3192 // Both the right and left sides have qualifiers. 3193 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3194 E = lhsOPT->qual_end(); I != E; ++I) { 3195 ObjCProtocolDecl *lhsProto = *I; 3196 bool match = false; 3197 3198 // when comparing an id<P> on lhs with a static type on rhs, 3199 // see if static class implements all of id's protocols, directly or 3200 // through its super class and categories. 3201 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3202 E = rhsQID->qual_end(); J != E; ++J) { 3203 ObjCProtocolDecl *rhsProto = *J; 3204 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3205 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3206 match = true; 3207 break; 3208 } 3209 } 3210 if (!match) 3211 return false; 3212 } 3213 return true; 3214 } 3215 return false; 3216} 3217 3218/// canAssignObjCInterfaces - Return true if the two interface types are 3219/// compatible for assignment from RHS to LHS. This handles validation of any 3220/// protocol qualifiers on the LHS or RHS. 3221/// 3222bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3223 const ObjCObjectPointerType *RHSOPT) { 3224 // If either type represents the built-in 'id' or 'Class' types, return true. 3225 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3226 return true; 3227 3228 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3229 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3230 QualType(RHSOPT,0), 3231 false); 3232 3233 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3234 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3235 if (LHS && RHS) // We have 2 user-defined types. 3236 return canAssignObjCInterfaces(LHS, RHS); 3237 3238 return false; 3239} 3240 3241bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3242 const ObjCInterfaceType *RHS) { 3243 // Verify that the base decls are compatible: the RHS must be a subclass of 3244 // the LHS. 3245 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3246 return false; 3247 3248 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3249 // protocol qualified at all, then we are good. 3250 if (LHS->getNumProtocols() == 0) 3251 return true; 3252 3253 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3254 // isn't a superset. 3255 if (RHS->getNumProtocols() == 0) 3256 return true; // FIXME: should return false! 3257 3258 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3259 LHSPE = LHS->qual_end(); 3260 LHSPI != LHSPE; LHSPI++) { 3261 bool RHSImplementsProtocol = false; 3262 3263 // If the RHS doesn't implement the protocol on the left, the types 3264 // are incompatible. 3265 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3266 RHSPE = RHS->qual_end(); 3267 RHSPI != RHSPE; RHSPI++) { 3268 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3269 RHSImplementsProtocol = true; 3270 break; 3271 } 3272 } 3273 // FIXME: For better diagnostics, consider passing back the protocol name. 3274 if (!RHSImplementsProtocol) 3275 return false; 3276 } 3277 // The RHS implements all protocols listed on the LHS. 3278 return true; 3279} 3280 3281bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3282 // get the "pointed to" types 3283 const ObjCObjectPointerType *LHSOPT = LHS->getAsObjCObjectPointerType(); 3284 const ObjCObjectPointerType *RHSOPT = RHS->getAsObjCObjectPointerType(); 3285 3286 if (!LHSOPT || !RHSOPT) 3287 return false; 3288 3289 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3290 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3291} 3292 3293/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3294/// both shall have the identically qualified version of a compatible type. 3295/// C99 6.2.7p1: Two types have compatible types if their types are the 3296/// same. See 6.7.[2,3,5] for additional rules. 3297bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3298 return !mergeTypes(LHS, RHS).isNull(); 3299} 3300 3301QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3302 const FunctionType *lbase = lhs->getAsFunctionType(); 3303 const FunctionType *rbase = rhs->getAsFunctionType(); 3304 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3305 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3306 bool allLTypes = true; 3307 bool allRTypes = true; 3308 3309 // Check return type 3310 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3311 if (retType.isNull()) return QualType(); 3312 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3313 allLTypes = false; 3314 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3315 allRTypes = false; 3316 3317 if (lproto && rproto) { // two C99 style function prototypes 3318 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3319 "C++ shouldn't be here"); 3320 unsigned lproto_nargs = lproto->getNumArgs(); 3321 unsigned rproto_nargs = rproto->getNumArgs(); 3322 3323 // Compatible functions must have the same number of arguments 3324 if (lproto_nargs != rproto_nargs) 3325 return QualType(); 3326 3327 // Variadic and non-variadic functions aren't compatible 3328 if (lproto->isVariadic() != rproto->isVariadic()) 3329 return QualType(); 3330 3331 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3332 return QualType(); 3333 3334 // Check argument compatibility 3335 llvm::SmallVector<QualType, 10> types; 3336 for (unsigned i = 0; i < lproto_nargs; i++) { 3337 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3338 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3339 QualType argtype = mergeTypes(largtype, rargtype); 3340 if (argtype.isNull()) return QualType(); 3341 types.push_back(argtype); 3342 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3343 allLTypes = false; 3344 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3345 allRTypes = false; 3346 } 3347 if (allLTypes) return lhs; 3348 if (allRTypes) return rhs; 3349 return getFunctionType(retType, types.begin(), types.size(), 3350 lproto->isVariadic(), lproto->getTypeQuals()); 3351 } 3352 3353 if (lproto) allRTypes = false; 3354 if (rproto) allLTypes = false; 3355 3356 const FunctionProtoType *proto = lproto ? lproto : rproto; 3357 if (proto) { 3358 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3359 if (proto->isVariadic()) return QualType(); 3360 // Check that the types are compatible with the types that 3361 // would result from default argument promotions (C99 6.7.5.3p15). 3362 // The only types actually affected are promotable integer 3363 // types and floats, which would be passed as a different 3364 // type depending on whether the prototype is visible. 3365 unsigned proto_nargs = proto->getNumArgs(); 3366 for (unsigned i = 0; i < proto_nargs; ++i) { 3367 QualType argTy = proto->getArgType(i); 3368 if (argTy->isPromotableIntegerType() || 3369 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3370 return QualType(); 3371 } 3372 3373 if (allLTypes) return lhs; 3374 if (allRTypes) return rhs; 3375 return getFunctionType(retType, proto->arg_type_begin(), 3376 proto->getNumArgs(), lproto->isVariadic(), 3377 lproto->getTypeQuals()); 3378 } 3379 3380 if (allLTypes) return lhs; 3381 if (allRTypes) return rhs; 3382 return getFunctionNoProtoType(retType); 3383} 3384 3385QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3386 // C++ [expr]: If an expression initially has the type "reference to T", the 3387 // type is adjusted to "T" prior to any further analysis, the expression 3388 // designates the object or function denoted by the reference, and the 3389 // expression is an lvalue unless the reference is an rvalue reference and 3390 // the expression is a function call (possibly inside parentheses). 3391 // FIXME: C++ shouldn't be going through here! The rules are different 3392 // enough that they should be handled separately. 3393 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3394 // shouldn't be going through here! 3395 if (const ReferenceType *RT = LHS->getAsReferenceType()) 3396 LHS = RT->getPointeeType(); 3397 if (const ReferenceType *RT = RHS->getAsReferenceType()) 3398 RHS = RT->getPointeeType(); 3399 3400 QualType LHSCan = getCanonicalType(LHS), 3401 RHSCan = getCanonicalType(RHS); 3402 3403 // If two types are identical, they are compatible. 3404 if (LHSCan == RHSCan) 3405 return LHS; 3406 3407 // If the qualifiers are different, the types aren't compatible 3408 // Note that we handle extended qualifiers later, in the 3409 // case for ExtQualType. 3410 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3411 return QualType(); 3412 3413 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3414 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3415 3416 // We want to consider the two function types to be the same for these 3417 // comparisons, just force one to the other. 3418 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3419 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3420 3421 // Strip off objc_gc attributes off the top level so they can be merged. 3422 // This is a complete mess, but the attribute itself doesn't make much sense. 3423 if (RHSClass == Type::ExtQual) { 3424 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3425 if (GCAttr != QualType::GCNone) { 3426 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3427 // __weak attribute must appear on both declarations. 3428 // __strong attribue is redundant if other decl is an objective-c 3429 // object pointer (or decorated with __strong attribute); otherwise 3430 // issue error. 3431 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3432 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3433 !LHSCan->isObjCObjectPointerType())) 3434 return QualType(); 3435 3436 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3437 RHS.getCVRQualifiers()); 3438 QualType Result = mergeTypes(LHS, RHS); 3439 if (!Result.isNull()) { 3440 if (Result.getObjCGCAttr() == QualType::GCNone) 3441 Result = getObjCGCQualType(Result, GCAttr); 3442 else if (Result.getObjCGCAttr() != GCAttr) 3443 Result = QualType(); 3444 } 3445 return Result; 3446 } 3447 } 3448 if (LHSClass == Type::ExtQual) { 3449 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3450 if (GCAttr != QualType::GCNone) { 3451 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3452 // __weak attribute must appear on both declarations. __strong 3453 // __strong attribue is redundant if other decl is an objective-c 3454 // object pointer (or decorated with __strong attribute); otherwise 3455 // issue error. 3456 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3457 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3458 !RHSCan->isObjCObjectPointerType())) 3459 return QualType(); 3460 3461 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3462 LHS.getCVRQualifiers()); 3463 QualType Result = mergeTypes(LHS, RHS); 3464 if (!Result.isNull()) { 3465 if (Result.getObjCGCAttr() == QualType::GCNone) 3466 Result = getObjCGCQualType(Result, GCAttr); 3467 else if (Result.getObjCGCAttr() != GCAttr) 3468 Result = QualType(); 3469 } 3470 return Result; 3471 } 3472 } 3473 3474 // Same as above for arrays 3475 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3476 LHSClass = Type::ConstantArray; 3477 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3478 RHSClass = Type::ConstantArray; 3479 3480 // Canonicalize ExtVector -> Vector. 3481 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3482 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3483 3484 // If the canonical type classes don't match. 3485 if (LHSClass != RHSClass) { 3486 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3487 // a signed integer type, or an unsigned integer type. 3488 if (const EnumType* ETy = LHS->getAsEnumType()) { 3489 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3490 return RHS; 3491 } 3492 if (const EnumType* ETy = RHS->getAsEnumType()) { 3493 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3494 return LHS; 3495 } 3496 3497 return QualType(); 3498 } 3499 3500 // The canonical type classes match. 3501 switch (LHSClass) { 3502#define TYPE(Class, Base) 3503#define ABSTRACT_TYPE(Class, Base) 3504#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3505#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3506#include "clang/AST/TypeNodes.def" 3507 assert(false && "Non-canonical and dependent types shouldn't get here"); 3508 return QualType(); 3509 3510 case Type::LValueReference: 3511 case Type::RValueReference: 3512 case Type::MemberPointer: 3513 assert(false && "C++ should never be in mergeTypes"); 3514 return QualType(); 3515 3516 case Type::IncompleteArray: 3517 case Type::VariableArray: 3518 case Type::FunctionProto: 3519 case Type::ExtVector: 3520 assert(false && "Types are eliminated above"); 3521 return QualType(); 3522 3523 case Type::Pointer: 3524 { 3525 // Merge two pointer types, while trying to preserve typedef info 3526 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 3527 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 3528 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3529 if (ResultType.isNull()) return QualType(); 3530 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3531 return LHS; 3532 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3533 return RHS; 3534 return getPointerType(ResultType); 3535 } 3536 case Type::BlockPointer: 3537 { 3538 // Merge two block pointer types, while trying to preserve typedef info 3539 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 3540 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 3541 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3542 if (ResultType.isNull()) return QualType(); 3543 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3544 return LHS; 3545 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3546 return RHS; 3547 return getBlockPointerType(ResultType); 3548 } 3549 case Type::ConstantArray: 3550 { 3551 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3552 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3553 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3554 return QualType(); 3555 3556 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3557 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3558 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3559 if (ResultType.isNull()) return QualType(); 3560 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3561 return LHS; 3562 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3563 return RHS; 3564 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3565 ArrayType::ArraySizeModifier(), 0); 3566 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3567 ArrayType::ArraySizeModifier(), 0); 3568 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3569 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3570 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3571 return LHS; 3572 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3573 return RHS; 3574 if (LVAT) { 3575 // FIXME: This isn't correct! But tricky to implement because 3576 // the array's size has to be the size of LHS, but the type 3577 // has to be different. 3578 return LHS; 3579 } 3580 if (RVAT) { 3581 // FIXME: This isn't correct! But tricky to implement because 3582 // the array's size has to be the size of RHS, but the type 3583 // has to be different. 3584 return RHS; 3585 } 3586 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3587 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3588 return getIncompleteArrayType(ResultType, 3589 ArrayType::ArraySizeModifier(), 0); 3590 } 3591 case Type::FunctionNoProto: 3592 return mergeFunctionTypes(LHS, RHS); 3593 case Type::Record: 3594 case Type::Enum: 3595 return QualType(); 3596 case Type::Builtin: 3597 // Only exactly equal builtin types are compatible, which is tested above. 3598 return QualType(); 3599 case Type::Complex: 3600 // Distinct complex types are incompatible. 3601 return QualType(); 3602 case Type::Vector: 3603 // FIXME: The merged type should be an ExtVector! 3604 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3605 return LHS; 3606 return QualType(); 3607 case Type::ObjCInterface: { 3608 // Check if the interfaces are assignment compatible. 3609 // FIXME: This should be type compatibility, e.g. whether 3610 // "LHS x; RHS x;" at global scope is legal. 3611 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3612 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3613 if (LHSIface && RHSIface && 3614 canAssignObjCInterfaces(LHSIface, RHSIface)) 3615 return LHS; 3616 3617 return QualType(); 3618 } 3619 case Type::ObjCObjectPointer: { 3620 if (canAssignObjCInterfaces(LHS->getAsObjCObjectPointerType(), 3621 RHS->getAsObjCObjectPointerType())) 3622 return LHS; 3623 3624 return QualType(); 3625 } 3626 case Type::FixedWidthInt: 3627 // Distinct fixed-width integers are not compatible. 3628 return QualType(); 3629 case Type::ExtQual: 3630 // FIXME: ExtQual types can be compatible even if they're not 3631 // identical! 3632 return QualType(); 3633 // First attempt at an implementation, but I'm not really sure it's 3634 // right... 3635#if 0 3636 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3637 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3638 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3639 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3640 return QualType(); 3641 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3642 LHSBase = QualType(LQual->getBaseType(), 0); 3643 RHSBase = QualType(RQual->getBaseType(), 0); 3644 ResultType = mergeTypes(LHSBase, RHSBase); 3645 if (ResultType.isNull()) return QualType(); 3646 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3647 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3648 return LHS; 3649 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3650 return RHS; 3651 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3652 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3653 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3654 return ResultType; 3655#endif 3656 3657 case Type::TemplateSpecialization: 3658 assert(false && "Dependent types have no size"); 3659 break; 3660 } 3661 3662 return QualType(); 3663} 3664 3665//===----------------------------------------------------------------------===// 3666// Integer Predicates 3667//===----------------------------------------------------------------------===// 3668 3669unsigned ASTContext::getIntWidth(QualType T) { 3670 if (T == BoolTy) 3671 return 1; 3672 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3673 return FWIT->getWidth(); 3674 } 3675 // For builtin types, just use the standard type sizing method 3676 return (unsigned)getTypeSize(T); 3677} 3678 3679QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3680 assert(T->isSignedIntegerType() && "Unexpected type"); 3681 if (const EnumType* ETy = T->getAsEnumType()) 3682 T = ETy->getDecl()->getIntegerType(); 3683 const BuiltinType* BTy = T->getAsBuiltinType(); 3684 assert (BTy && "Unexpected signed integer type"); 3685 switch (BTy->getKind()) { 3686 case BuiltinType::Char_S: 3687 case BuiltinType::SChar: 3688 return UnsignedCharTy; 3689 case BuiltinType::Short: 3690 return UnsignedShortTy; 3691 case BuiltinType::Int: 3692 return UnsignedIntTy; 3693 case BuiltinType::Long: 3694 return UnsignedLongTy; 3695 case BuiltinType::LongLong: 3696 return UnsignedLongLongTy; 3697 case BuiltinType::Int128: 3698 return UnsignedInt128Ty; 3699 default: 3700 assert(0 && "Unexpected signed integer type"); 3701 return QualType(); 3702 } 3703} 3704 3705ExternalASTSource::~ExternalASTSource() { } 3706 3707void ExternalASTSource::PrintStats() { } 3708 3709 3710//===----------------------------------------------------------------------===// 3711// Builtin Type Computation 3712//===----------------------------------------------------------------------===// 3713 3714/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3715/// pointer over the consumed characters. This returns the resultant type. 3716static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3717 ASTContext::GetBuiltinTypeError &Error, 3718 bool AllowTypeModifiers = true) { 3719 // Modifiers. 3720 int HowLong = 0; 3721 bool Signed = false, Unsigned = false; 3722 3723 // Read the modifiers first. 3724 bool Done = false; 3725 while (!Done) { 3726 switch (*Str++) { 3727 default: Done = true; --Str; break; 3728 case 'S': 3729 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3730 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3731 Signed = true; 3732 break; 3733 case 'U': 3734 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 3735 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 3736 Unsigned = true; 3737 break; 3738 case 'L': 3739 assert(HowLong <= 2 && "Can't have LLLL modifier"); 3740 ++HowLong; 3741 break; 3742 } 3743 } 3744 3745 QualType Type; 3746 3747 // Read the base type. 3748 switch (*Str++) { 3749 default: assert(0 && "Unknown builtin type letter!"); 3750 case 'v': 3751 assert(HowLong == 0 && !Signed && !Unsigned && 3752 "Bad modifiers used with 'v'!"); 3753 Type = Context.VoidTy; 3754 break; 3755 case 'f': 3756 assert(HowLong == 0 && !Signed && !Unsigned && 3757 "Bad modifiers used with 'f'!"); 3758 Type = Context.FloatTy; 3759 break; 3760 case 'd': 3761 assert(HowLong < 2 && !Signed && !Unsigned && 3762 "Bad modifiers used with 'd'!"); 3763 if (HowLong) 3764 Type = Context.LongDoubleTy; 3765 else 3766 Type = Context.DoubleTy; 3767 break; 3768 case 's': 3769 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 3770 if (Unsigned) 3771 Type = Context.UnsignedShortTy; 3772 else 3773 Type = Context.ShortTy; 3774 break; 3775 case 'i': 3776 if (HowLong == 3) 3777 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 3778 else if (HowLong == 2) 3779 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 3780 else if (HowLong == 1) 3781 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 3782 else 3783 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 3784 break; 3785 case 'c': 3786 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 3787 if (Signed) 3788 Type = Context.SignedCharTy; 3789 else if (Unsigned) 3790 Type = Context.UnsignedCharTy; 3791 else 3792 Type = Context.CharTy; 3793 break; 3794 case 'b': // boolean 3795 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 3796 Type = Context.BoolTy; 3797 break; 3798 case 'z': // size_t. 3799 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 3800 Type = Context.getSizeType(); 3801 break; 3802 case 'F': 3803 Type = Context.getCFConstantStringType(); 3804 break; 3805 case 'a': 3806 Type = Context.getBuiltinVaListType(); 3807 assert(!Type.isNull() && "builtin va list type not initialized!"); 3808 break; 3809 case 'A': 3810 // This is a "reference" to a va_list; however, what exactly 3811 // this means depends on how va_list is defined. There are two 3812 // different kinds of va_list: ones passed by value, and ones 3813 // passed by reference. An example of a by-value va_list is 3814 // x86, where va_list is a char*. An example of by-ref va_list 3815 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 3816 // we want this argument to be a char*&; for x86-64, we want 3817 // it to be a __va_list_tag*. 3818 Type = Context.getBuiltinVaListType(); 3819 assert(!Type.isNull() && "builtin va list type not initialized!"); 3820 if (Type->isArrayType()) { 3821 Type = Context.getArrayDecayedType(Type); 3822 } else { 3823 Type = Context.getLValueReferenceType(Type); 3824 } 3825 break; 3826 case 'V': { 3827 char *End; 3828 3829 unsigned NumElements = strtoul(Str, &End, 10); 3830 assert(End != Str && "Missing vector size"); 3831 3832 Str = End; 3833 3834 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 3835 Type = Context.getVectorType(ElementType, NumElements); 3836 break; 3837 } 3838 case 'P': { 3839 Type = Context.getFILEType(); 3840 if (Type.isNull()) { 3841 Error = ASTContext::GE_Missing_FILE; 3842 return QualType(); 3843 } else { 3844 break; 3845 } 3846 } 3847 } 3848 3849 if (!AllowTypeModifiers) 3850 return Type; 3851 3852 Done = false; 3853 while (!Done) { 3854 switch (*Str++) { 3855 default: Done = true; --Str; break; 3856 case '*': 3857 Type = Context.getPointerType(Type); 3858 break; 3859 case '&': 3860 Type = Context.getLValueReferenceType(Type); 3861 break; 3862 // FIXME: There's no way to have a built-in with an rvalue ref arg. 3863 case 'C': 3864 Type = Type.getQualifiedType(QualType::Const); 3865 break; 3866 } 3867 } 3868 3869 return Type; 3870} 3871 3872/// GetBuiltinType - Return the type for the specified builtin. 3873QualType ASTContext::GetBuiltinType(unsigned id, 3874 GetBuiltinTypeError &Error) { 3875 const char *TypeStr = BuiltinInfo.GetTypeString(id); 3876 3877 llvm::SmallVector<QualType, 8> ArgTypes; 3878 3879 Error = GE_None; 3880 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 3881 if (Error != GE_None) 3882 return QualType(); 3883 while (TypeStr[0] && TypeStr[0] != '.') { 3884 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 3885 if (Error != GE_None) 3886 return QualType(); 3887 3888 // Do array -> pointer decay. The builtin should use the decayed type. 3889 if (Ty->isArrayType()) 3890 Ty = getArrayDecayedType(Ty); 3891 3892 ArgTypes.push_back(Ty); 3893 } 3894 3895 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 3896 "'.' should only occur at end of builtin type list!"); 3897 3898 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 3899 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 3900 return getFunctionNoProtoType(ResType); 3901 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 3902 TypeStr[0] == '.', 0); 3903} 3904