ASTContext.cpp revision 470301bac9c8abfc6b451b3b669c6695a9fd1518
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 const ASTRecordLayout *&Entry = ASTRecordLayouts[D]; 912 if (Entry) return *Entry; 913 914 const ASTRecordLayout *NewEntry = 915 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 916 Entry = NewEntry; 917 918 return *NewEntry; 919} 920 921//===----------------------------------------------------------------------===// 922// Type creation/memoization methods 923//===----------------------------------------------------------------------===// 924 925QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 926 QualType CanT = getCanonicalType(T); 927 if (CanT.getAddressSpace() == AddressSpace) 928 return T; 929 930 // If we are composing extended qualifiers together, merge together into one 931 // ExtQualType node. 932 unsigned CVRQuals = T.getCVRQualifiers(); 933 QualType::GCAttrTypes GCAttr = QualType::GCNone; 934 Type *TypeNode = T.getTypePtr(); 935 936 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 937 // If this type already has an address space specified, it cannot get 938 // another one. 939 assert(EQT->getAddressSpace() == 0 && 940 "Type cannot be in multiple addr spaces!"); 941 GCAttr = EQT->getObjCGCAttr(); 942 TypeNode = EQT->getBaseType(); 943 } 944 945 // Check if we've already instantiated this type. 946 llvm::FoldingSetNodeID ID; 947 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 948 void *InsertPos = 0; 949 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 950 return QualType(EXTQy, CVRQuals); 951 952 // If the base type isn't canonical, this won't be a canonical type either, 953 // so fill in the canonical type field. 954 QualType Canonical; 955 if (!TypeNode->isCanonical()) { 956 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 957 958 // Update InsertPos, the previous call could have invalidated it. 959 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 960 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 961 } 962 ExtQualType *New = 963 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 964 ExtQualTypes.InsertNode(New, InsertPos); 965 Types.push_back(New); 966 return QualType(New, CVRQuals); 967} 968 969QualType ASTContext::getObjCGCQualType(QualType T, 970 QualType::GCAttrTypes GCAttr) { 971 QualType CanT = getCanonicalType(T); 972 if (CanT.getObjCGCAttr() == GCAttr) 973 return T; 974 975 if (T->isPointerType()) { 976 QualType Pointee = T->getAsPointerType()->getPointeeType(); 977 if (Pointee->isAnyPointerType()) { 978 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 979 return getPointerType(ResultType); 980 } 981 } 982 // If we are composing extended qualifiers together, merge together into one 983 // ExtQualType node. 984 unsigned CVRQuals = T.getCVRQualifiers(); 985 Type *TypeNode = T.getTypePtr(); 986 unsigned AddressSpace = 0; 987 988 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 989 // If this type already has an address space specified, it cannot get 990 // another one. 991 assert(EQT->getObjCGCAttr() == QualType::GCNone && 992 "Type cannot be in multiple addr spaces!"); 993 AddressSpace = EQT->getAddressSpace(); 994 TypeNode = EQT->getBaseType(); 995 } 996 997 // Check if we've already instantiated an gc qual'd type of this type. 998 llvm::FoldingSetNodeID ID; 999 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 1000 void *InsertPos = 0; 1001 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 1002 return QualType(EXTQy, CVRQuals); 1003 1004 // If the base type isn't canonical, this won't be a canonical type either, 1005 // so fill in the canonical type field. 1006 // FIXME: Isn't this also not canonical if the base type is a array 1007 // or pointer type? I can't find any documentation for objc_gc, though... 1008 QualType Canonical; 1009 if (!T->isCanonical()) { 1010 Canonical = getObjCGCQualType(CanT, GCAttr); 1011 1012 // Update InsertPos, the previous call could have invalidated it. 1013 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 1014 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1015 } 1016 ExtQualType *New = 1017 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 1018 ExtQualTypes.InsertNode(New, InsertPos); 1019 Types.push_back(New); 1020 return QualType(New, CVRQuals); 1021} 1022 1023/// getComplexType - Return the uniqued reference to the type for a complex 1024/// number with the specified element type. 1025QualType ASTContext::getComplexType(QualType T) { 1026 // Unique pointers, to guarantee there is only one pointer of a particular 1027 // structure. 1028 llvm::FoldingSetNodeID ID; 1029 ComplexType::Profile(ID, T); 1030 1031 void *InsertPos = 0; 1032 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1033 return QualType(CT, 0); 1034 1035 // If the pointee type isn't canonical, this won't be a canonical type either, 1036 // so fill in the canonical type field. 1037 QualType Canonical; 1038 if (!T->isCanonical()) { 1039 Canonical = getComplexType(getCanonicalType(T)); 1040 1041 // Get the new insert position for the node we care about. 1042 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1043 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1044 } 1045 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 1046 Types.push_back(New); 1047 ComplexTypes.InsertNode(New, InsertPos); 1048 return QualType(New, 0); 1049} 1050 1051QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1052 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1053 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1054 FixedWidthIntType *&Entry = Map[Width]; 1055 if (!Entry) 1056 Entry = new FixedWidthIntType(Width, Signed); 1057 return QualType(Entry, 0); 1058} 1059 1060/// getPointerType - Return the uniqued reference to the type for a pointer to 1061/// the specified type. 1062QualType ASTContext::getPointerType(QualType T) { 1063 // Unique pointers, to guarantee there is only one pointer of a particular 1064 // structure. 1065 llvm::FoldingSetNodeID ID; 1066 PointerType::Profile(ID, T); 1067 1068 void *InsertPos = 0; 1069 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1070 return QualType(PT, 0); 1071 1072 // If the pointee type isn't canonical, this won't be a canonical type either, 1073 // so fill in the canonical type field. 1074 QualType Canonical; 1075 if (!T->isCanonical()) { 1076 Canonical = getPointerType(getCanonicalType(T)); 1077 1078 // Get the new insert position for the node we care about. 1079 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1080 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1081 } 1082 PointerType *New = new (*this,8) PointerType(T, Canonical); 1083 Types.push_back(New); 1084 PointerTypes.InsertNode(New, InsertPos); 1085 return QualType(New, 0); 1086} 1087 1088/// getBlockPointerType - Return the uniqued reference to the type for 1089/// a pointer to the specified block. 1090QualType ASTContext::getBlockPointerType(QualType T) { 1091 assert(T->isFunctionType() && "block of function types only"); 1092 // Unique pointers, to guarantee there is only one block of a particular 1093 // structure. 1094 llvm::FoldingSetNodeID ID; 1095 BlockPointerType::Profile(ID, T); 1096 1097 void *InsertPos = 0; 1098 if (BlockPointerType *PT = 1099 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1100 return QualType(PT, 0); 1101 1102 // If the block pointee type isn't canonical, this won't be a canonical 1103 // type either so fill in the canonical type field. 1104 QualType Canonical; 1105 if (!T->isCanonical()) { 1106 Canonical = getBlockPointerType(getCanonicalType(T)); 1107 1108 // Get the new insert position for the node we care about. 1109 BlockPointerType *NewIP = 1110 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1111 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1112 } 1113 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 1114 Types.push_back(New); 1115 BlockPointerTypes.InsertNode(New, InsertPos); 1116 return QualType(New, 0); 1117} 1118 1119/// getLValueReferenceType - Return the uniqued reference to the type for an 1120/// lvalue reference to the specified type. 1121QualType ASTContext::getLValueReferenceType(QualType T) { 1122 // Unique pointers, to guarantee there is only one pointer of a particular 1123 // structure. 1124 llvm::FoldingSetNodeID ID; 1125 ReferenceType::Profile(ID, T); 1126 1127 void *InsertPos = 0; 1128 if (LValueReferenceType *RT = 1129 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1130 return QualType(RT, 0); 1131 1132 // If the referencee type isn't canonical, this won't be a canonical type 1133 // either, so fill in the canonical type field. 1134 QualType Canonical; 1135 if (!T->isCanonical()) { 1136 Canonical = getLValueReferenceType(getCanonicalType(T)); 1137 1138 // Get the new insert position for the node we care about. 1139 LValueReferenceType *NewIP = 1140 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1141 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1142 } 1143 1144 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 1145 Types.push_back(New); 1146 LValueReferenceTypes.InsertNode(New, InsertPos); 1147 return QualType(New, 0); 1148} 1149 1150/// getRValueReferenceType - Return the uniqued reference to the type for an 1151/// rvalue reference to the specified type. 1152QualType ASTContext::getRValueReferenceType(QualType T) { 1153 // Unique pointers, to guarantee there is only one pointer of a particular 1154 // structure. 1155 llvm::FoldingSetNodeID ID; 1156 ReferenceType::Profile(ID, T); 1157 1158 void *InsertPos = 0; 1159 if (RValueReferenceType *RT = 1160 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1161 return QualType(RT, 0); 1162 1163 // If the referencee type isn't canonical, this won't be a canonical type 1164 // either, so fill in the canonical type field. 1165 QualType Canonical; 1166 if (!T->isCanonical()) { 1167 Canonical = getRValueReferenceType(getCanonicalType(T)); 1168 1169 // Get the new insert position for the node we care about. 1170 RValueReferenceType *NewIP = 1171 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1172 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1173 } 1174 1175 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 1176 Types.push_back(New); 1177 RValueReferenceTypes.InsertNode(New, InsertPos); 1178 return QualType(New, 0); 1179} 1180 1181/// getMemberPointerType - Return the uniqued reference to the type for a 1182/// member pointer to the specified type, in the specified class. 1183QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1184{ 1185 // Unique pointers, to guarantee there is only one pointer of a particular 1186 // structure. 1187 llvm::FoldingSetNodeID ID; 1188 MemberPointerType::Profile(ID, T, Cls); 1189 1190 void *InsertPos = 0; 1191 if (MemberPointerType *PT = 1192 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1193 return QualType(PT, 0); 1194 1195 // If the pointee or class type isn't canonical, this won't be a canonical 1196 // type either, so fill in the canonical type field. 1197 QualType Canonical; 1198 if (!T->isCanonical()) { 1199 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1200 1201 // Get the new insert position for the node we care about. 1202 MemberPointerType *NewIP = 1203 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1204 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1205 } 1206 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1207 Types.push_back(New); 1208 MemberPointerTypes.InsertNode(New, InsertPos); 1209 return QualType(New, 0); 1210} 1211 1212/// getConstantArrayType - Return the unique reference to the type for an 1213/// array of the specified element type. 1214QualType ASTContext::getConstantArrayType(QualType EltTy, 1215 const llvm::APInt &ArySizeIn, 1216 ArrayType::ArraySizeModifier ASM, 1217 unsigned EltTypeQuals) { 1218 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1219 "Constant array of VLAs is illegal!"); 1220 1221 // Convert the array size into a canonical width matching the pointer size for 1222 // the target. 1223 llvm::APInt ArySize(ArySizeIn); 1224 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1225 1226 llvm::FoldingSetNodeID ID; 1227 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1228 1229 void *InsertPos = 0; 1230 if (ConstantArrayType *ATP = 1231 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1232 return QualType(ATP, 0); 1233 1234 // If the element type isn't canonical, this won't be a canonical type either, 1235 // so fill in the canonical type field. 1236 QualType Canonical; 1237 if (!EltTy->isCanonical()) { 1238 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1239 ASM, EltTypeQuals); 1240 // Get the new insert position for the node we care about. 1241 ConstantArrayType *NewIP = 1242 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1243 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1244 } 1245 1246 ConstantArrayType *New = 1247 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1248 ConstantArrayTypes.InsertNode(New, InsertPos); 1249 Types.push_back(New); 1250 return QualType(New, 0); 1251} 1252 1253/// getConstantArrayWithExprType - Return a reference to the type for 1254/// an array of the specified element type. 1255QualType 1256ASTContext::getConstantArrayWithExprType(QualType EltTy, 1257 const llvm::APInt &ArySizeIn, 1258 Expr *ArySizeExpr, 1259 ArrayType::ArraySizeModifier ASM, 1260 unsigned EltTypeQuals, 1261 SourceRange Brackets) { 1262 // Convert the array size into a canonical width matching the pointer 1263 // size for the target. 1264 llvm::APInt ArySize(ArySizeIn); 1265 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1266 1267 // Compute the canonical ConstantArrayType. 1268 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1269 ArySize, ASM, EltTypeQuals); 1270 // Since we don't unique expressions, it isn't possible to unique VLA's 1271 // that have an expression provided for their size. 1272 ConstantArrayWithExprType *New = 1273 new(*this,8)ConstantArrayWithExprType(EltTy, Canonical, 1274 ArySize, ArySizeExpr, 1275 ASM, EltTypeQuals, Brackets); 1276 Types.push_back(New); 1277 return QualType(New, 0); 1278} 1279 1280/// getConstantArrayWithoutExprType - Return a reference to the type for 1281/// an array of the specified element type. 1282QualType 1283ASTContext::getConstantArrayWithoutExprType(QualType EltTy, 1284 const llvm::APInt &ArySizeIn, 1285 ArrayType::ArraySizeModifier ASM, 1286 unsigned EltTypeQuals) { 1287 // Convert the array size into a canonical width matching the pointer 1288 // size for the target. 1289 llvm::APInt ArySize(ArySizeIn); 1290 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1291 1292 // Compute the canonical ConstantArrayType. 1293 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1294 ArySize, ASM, EltTypeQuals); 1295 ConstantArrayWithoutExprType *New = 1296 new(*this,8)ConstantArrayWithoutExprType(EltTy, Canonical, 1297 ArySize, ASM, EltTypeQuals); 1298 Types.push_back(New); 1299 return QualType(New, 0); 1300} 1301 1302/// getVariableArrayType - Returns a non-unique reference to the type for a 1303/// variable array of the specified element type. 1304QualType ASTContext::getVariableArrayType(QualType EltTy, 1305 Expr *NumElts, 1306 ArrayType::ArraySizeModifier ASM, 1307 unsigned EltTypeQuals, 1308 SourceRange Brackets) { 1309 // Since we don't unique expressions, it isn't possible to unique VLA's 1310 // that have an expression provided for their size. 1311 1312 VariableArrayType *New = 1313 new(*this,8)VariableArrayType(EltTy, QualType(), 1314 NumElts, ASM, EltTypeQuals, Brackets); 1315 1316 VariableArrayTypes.push_back(New); 1317 Types.push_back(New); 1318 return QualType(New, 0); 1319} 1320 1321/// getDependentSizedArrayType - Returns a non-unique reference to 1322/// the type for a dependently-sized array of the specified element 1323/// type. FIXME: We will need these to be uniqued, or at least 1324/// comparable, at some point. 1325QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1326 Expr *NumElts, 1327 ArrayType::ArraySizeModifier ASM, 1328 unsigned EltTypeQuals, 1329 SourceRange Brackets) { 1330 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1331 "Size must be type- or value-dependent!"); 1332 1333 // Since we don't unique expressions, it isn't possible to unique 1334 // dependently-sized array types. 1335 1336 DependentSizedArrayType *New = 1337 new (*this,8) DependentSizedArrayType(EltTy, QualType(), 1338 NumElts, ASM, EltTypeQuals, 1339 Brackets); 1340 1341 DependentSizedArrayTypes.push_back(New); 1342 Types.push_back(New); 1343 return QualType(New, 0); 1344} 1345 1346QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1347 ArrayType::ArraySizeModifier ASM, 1348 unsigned EltTypeQuals) { 1349 llvm::FoldingSetNodeID ID; 1350 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1351 1352 void *InsertPos = 0; 1353 if (IncompleteArrayType *ATP = 1354 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1355 return QualType(ATP, 0); 1356 1357 // If the element type isn't canonical, this won't be a canonical type 1358 // either, so fill in the canonical type field. 1359 QualType Canonical; 1360 1361 if (!EltTy->isCanonical()) { 1362 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1363 ASM, EltTypeQuals); 1364 1365 // Get the new insert position for the node we care about. 1366 IncompleteArrayType *NewIP = 1367 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1368 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1369 } 1370 1371 IncompleteArrayType *New 1372 = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1373 ASM, EltTypeQuals); 1374 1375 IncompleteArrayTypes.InsertNode(New, InsertPos); 1376 Types.push_back(New); 1377 return QualType(New, 0); 1378} 1379 1380/// getVectorType - Return the unique reference to a vector type of 1381/// the specified element type and size. VectorType must be a built-in type. 1382QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1383 BuiltinType *baseType; 1384 1385 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1386 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1387 1388 // Check if we've already instantiated a vector of this type. 1389 llvm::FoldingSetNodeID ID; 1390 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1391 void *InsertPos = 0; 1392 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1393 return QualType(VTP, 0); 1394 1395 // If the element type isn't canonical, this won't be a canonical type either, 1396 // so fill in the canonical type field. 1397 QualType Canonical; 1398 if (!vecType->isCanonical()) { 1399 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1400 1401 // Get the new insert position for the node we care about. 1402 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1403 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1404 } 1405 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1406 VectorTypes.InsertNode(New, InsertPos); 1407 Types.push_back(New); 1408 return QualType(New, 0); 1409} 1410 1411/// getExtVectorType - Return the unique reference to an extended vector type of 1412/// the specified element type and size. VectorType must be a built-in type. 1413QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1414 BuiltinType *baseType; 1415 1416 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1417 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1418 1419 // Check if we've already instantiated a vector of this type. 1420 llvm::FoldingSetNodeID ID; 1421 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1422 void *InsertPos = 0; 1423 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1424 return QualType(VTP, 0); 1425 1426 // If the element type isn't canonical, this won't be a canonical type either, 1427 // so fill in the canonical type field. 1428 QualType Canonical; 1429 if (!vecType->isCanonical()) { 1430 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1431 1432 // Get the new insert position for the node we care about. 1433 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1434 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1435 } 1436 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1437 VectorTypes.InsertNode(New, InsertPos); 1438 Types.push_back(New); 1439 return QualType(New, 0); 1440} 1441 1442QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1443 Expr *SizeExpr, 1444 SourceLocation AttrLoc) { 1445 DependentSizedExtVectorType *New = 1446 new (*this,8) DependentSizedExtVectorType(vecType, QualType(), 1447 SizeExpr, AttrLoc); 1448 1449 DependentSizedExtVectorTypes.push_back(New); 1450 Types.push_back(New); 1451 return QualType(New, 0); 1452} 1453 1454/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1455/// 1456QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) { 1457 // Unique functions, to guarantee there is only one function of a particular 1458 // structure. 1459 llvm::FoldingSetNodeID ID; 1460 FunctionNoProtoType::Profile(ID, ResultTy); 1461 1462 void *InsertPos = 0; 1463 if (FunctionNoProtoType *FT = 1464 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1465 return QualType(FT, 0); 1466 1467 QualType Canonical; 1468 if (!ResultTy->isCanonical()) { 1469 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy)); 1470 1471 // Get the new insert position for the node we care about. 1472 FunctionNoProtoType *NewIP = 1473 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1474 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1475 } 1476 1477 FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical); 1478 Types.push_back(New); 1479 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1480 return QualType(New, 0); 1481} 1482 1483/// getFunctionType - Return a normal function type with a typed argument 1484/// list. isVariadic indicates whether the argument list includes '...'. 1485QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1486 unsigned NumArgs, bool isVariadic, 1487 unsigned TypeQuals, bool hasExceptionSpec, 1488 bool hasAnyExceptionSpec, unsigned NumExs, 1489 const QualType *ExArray) { 1490 // Unique functions, to guarantee there is only one function of a particular 1491 // structure. 1492 llvm::FoldingSetNodeID ID; 1493 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1494 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1495 NumExs, ExArray); 1496 1497 void *InsertPos = 0; 1498 if (FunctionProtoType *FTP = 1499 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1500 return QualType(FTP, 0); 1501 1502 // Determine whether the type being created is already canonical or not. 1503 bool isCanonical = ResultTy->isCanonical(); 1504 if (hasExceptionSpec) 1505 isCanonical = false; 1506 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1507 if (!ArgArray[i]->isCanonical()) 1508 isCanonical = false; 1509 1510 // If this type isn't canonical, get the canonical version of it. 1511 // The exception spec is not part of the canonical type. 1512 QualType Canonical; 1513 if (!isCanonical) { 1514 llvm::SmallVector<QualType, 16> CanonicalArgs; 1515 CanonicalArgs.reserve(NumArgs); 1516 for (unsigned i = 0; i != NumArgs; ++i) 1517 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1518 1519 Canonical = getFunctionType(getCanonicalType(ResultTy), 1520 CanonicalArgs.data(), NumArgs, 1521 isVariadic, TypeQuals); 1522 1523 // Get the new insert position for the node we care about. 1524 FunctionProtoType *NewIP = 1525 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1526 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1527 } 1528 1529 // FunctionProtoType objects are allocated with extra bytes after them 1530 // for two variable size arrays (for parameter and exception types) at the 1531 // end of them. 1532 FunctionProtoType *FTP = 1533 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1534 NumArgs*sizeof(QualType) + 1535 NumExs*sizeof(QualType), 8); 1536 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1537 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1538 ExArray, NumExs, Canonical); 1539 Types.push_back(FTP); 1540 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1541 return QualType(FTP, 0); 1542} 1543 1544/// getTypeDeclType - Return the unique reference to the type for the 1545/// specified type declaration. 1546QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1547 assert(Decl && "Passed null for Decl param"); 1548 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1549 1550 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1551 return getTypedefType(Typedef); 1552 else if (isa<TemplateTypeParmDecl>(Decl)) { 1553 assert(false && "Template type parameter types are always available."); 1554 } else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1555 return getObjCInterfaceType(ObjCInterface); 1556 1557 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1558 if (PrevDecl) 1559 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1560 else 1561 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1562 } 1563 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1564 if (PrevDecl) 1565 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1566 else 1567 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1568 } 1569 else 1570 assert(false && "TypeDecl without a type?"); 1571 1572 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1573 return QualType(Decl->TypeForDecl, 0); 1574} 1575 1576/// getTypedefType - Return the unique reference to the type for the 1577/// specified typename decl. 1578QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1579 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1580 1581 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1582 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1583 Types.push_back(Decl->TypeForDecl); 1584 return QualType(Decl->TypeForDecl, 0); 1585} 1586 1587/// \brief Retrieve the template type parameter type for a template 1588/// parameter or parameter pack with the given depth, index, and (optionally) 1589/// name. 1590QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1591 bool ParameterPack, 1592 IdentifierInfo *Name) { 1593 llvm::FoldingSetNodeID ID; 1594 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1595 void *InsertPos = 0; 1596 TemplateTypeParmType *TypeParm 1597 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1598 1599 if (TypeParm) 1600 return QualType(TypeParm, 0); 1601 1602 if (Name) { 1603 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1604 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack, 1605 Name, Canon); 1606 } else 1607 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack); 1608 1609 Types.push_back(TypeParm); 1610 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1611 1612 return QualType(TypeParm, 0); 1613} 1614 1615QualType 1616ASTContext::getTemplateSpecializationType(TemplateName Template, 1617 const TemplateArgument *Args, 1618 unsigned NumArgs, 1619 QualType Canon) { 1620 if (!Canon.isNull()) 1621 Canon = getCanonicalType(Canon); 1622 1623 llvm::FoldingSetNodeID ID; 1624 TemplateSpecializationType::Profile(ID, Template, Args, NumArgs); 1625 1626 void *InsertPos = 0; 1627 TemplateSpecializationType *Spec 1628 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1629 1630 if (Spec) 1631 return QualType(Spec, 0); 1632 1633 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1634 sizeof(TemplateArgument) * NumArgs), 1635 8); 1636 Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon); 1637 Types.push_back(Spec); 1638 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1639 1640 return QualType(Spec, 0); 1641} 1642 1643QualType 1644ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1645 QualType NamedType) { 1646 llvm::FoldingSetNodeID ID; 1647 QualifiedNameType::Profile(ID, NNS, NamedType); 1648 1649 void *InsertPos = 0; 1650 QualifiedNameType *T 1651 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1652 if (T) 1653 return QualType(T, 0); 1654 1655 T = new (*this) QualifiedNameType(NNS, NamedType, 1656 getCanonicalType(NamedType)); 1657 Types.push_back(T); 1658 QualifiedNameTypes.InsertNode(T, InsertPos); 1659 return QualType(T, 0); 1660} 1661 1662QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1663 const IdentifierInfo *Name, 1664 QualType Canon) { 1665 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1666 1667 if (Canon.isNull()) { 1668 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1669 if (CanonNNS != NNS) 1670 Canon = getTypenameType(CanonNNS, Name); 1671 } 1672 1673 llvm::FoldingSetNodeID ID; 1674 TypenameType::Profile(ID, NNS, Name); 1675 1676 void *InsertPos = 0; 1677 TypenameType *T 1678 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1679 if (T) 1680 return QualType(T, 0); 1681 1682 T = new (*this) TypenameType(NNS, Name, Canon); 1683 Types.push_back(T); 1684 TypenameTypes.InsertNode(T, InsertPos); 1685 return QualType(T, 0); 1686} 1687 1688QualType 1689ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1690 const TemplateSpecializationType *TemplateId, 1691 QualType Canon) { 1692 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1693 1694 if (Canon.isNull()) { 1695 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1696 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1697 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1698 const TemplateSpecializationType *CanonTemplateId 1699 = CanonType->getAsTemplateSpecializationType(); 1700 assert(CanonTemplateId && 1701 "Canonical type must also be a template specialization type"); 1702 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1703 } 1704 } 1705 1706 llvm::FoldingSetNodeID ID; 1707 TypenameType::Profile(ID, NNS, TemplateId); 1708 1709 void *InsertPos = 0; 1710 TypenameType *T 1711 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1712 if (T) 1713 return QualType(T, 0); 1714 1715 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1716 Types.push_back(T); 1717 TypenameTypes.InsertNode(T, InsertPos); 1718 return QualType(T, 0); 1719} 1720 1721/// CmpProtocolNames - Comparison predicate for sorting protocols 1722/// alphabetically. 1723static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1724 const ObjCProtocolDecl *RHS) { 1725 return LHS->getDeclName() < RHS->getDeclName(); 1726} 1727 1728static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1729 unsigned &NumProtocols) { 1730 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1731 1732 // Sort protocols, keyed by name. 1733 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1734 1735 // Remove duplicates. 1736 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1737 NumProtocols = ProtocolsEnd-Protocols; 1738} 1739 1740/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1741/// the given interface decl and the conforming protocol list. 1742QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1743 ObjCProtocolDecl **Protocols, 1744 unsigned NumProtocols) { 1745 // Sort the protocol list alphabetically to canonicalize it. 1746 if (NumProtocols) 1747 SortAndUniqueProtocols(Protocols, NumProtocols); 1748 1749 llvm::FoldingSetNodeID ID; 1750 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1751 1752 void *InsertPos = 0; 1753 if (ObjCObjectPointerType *QT = 1754 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1755 return QualType(QT, 0); 1756 1757 // No Match; 1758 ObjCObjectPointerType *QType = 1759 new (*this,8) ObjCObjectPointerType(InterfaceT, Protocols, NumProtocols); 1760 1761 Types.push_back(QType); 1762 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1763 return QualType(QType, 0); 1764} 1765 1766/// getObjCInterfaceType - Return the unique reference to the type for the 1767/// specified ObjC interface decl. The list of protocols is optional. 1768QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1769 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1770 if (NumProtocols) 1771 // Sort the protocol list alphabetically to canonicalize it. 1772 SortAndUniqueProtocols(Protocols, NumProtocols); 1773 1774 llvm::FoldingSetNodeID ID; 1775 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1776 1777 void *InsertPos = 0; 1778 if (ObjCInterfaceType *QT = 1779 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1780 return QualType(QT, 0); 1781 1782 // No Match; 1783 ObjCInterfaceType *QType = 1784 new (*this,8) ObjCInterfaceType(const_cast<ObjCInterfaceDecl*>(Decl), 1785 Protocols, NumProtocols); 1786 Types.push_back(QType); 1787 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 1788 return QualType(QType, 0); 1789} 1790 1791/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1792/// TypeOfExprType AST's (since expression's are never shared). For example, 1793/// multiple declarations that refer to "typeof(x)" all contain different 1794/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1795/// on canonical type's (which are always unique). 1796QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1797 TypeOfExprType *toe; 1798 if (tofExpr->isTypeDependent()) 1799 toe = new (*this, 8) TypeOfExprType(tofExpr); 1800 else { 1801 QualType Canonical = getCanonicalType(tofExpr->getType()); 1802 toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1803 } 1804 Types.push_back(toe); 1805 return QualType(toe, 0); 1806} 1807 1808/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1809/// TypeOfType AST's. The only motivation to unique these nodes would be 1810/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1811/// an issue. This doesn't effect the type checker, since it operates 1812/// on canonical type's (which are always unique). 1813QualType ASTContext::getTypeOfType(QualType tofType) { 1814 QualType Canonical = getCanonicalType(tofType); 1815 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1816 Types.push_back(tot); 1817 return QualType(tot, 0); 1818} 1819 1820/// getDecltypeForExpr - Given an expr, will return the decltype for that 1821/// expression, according to the rules in C++0x [dcl.type.simple]p4 1822static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 1823 if (e->isTypeDependent()) 1824 return Context.DependentTy; 1825 1826 // If e is an id expression or a class member access, decltype(e) is defined 1827 // as the type of the entity named by e. 1828 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 1829 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 1830 return VD->getType(); 1831 } 1832 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 1833 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1834 return FD->getType(); 1835 } 1836 // If e is a function call or an invocation of an overloaded operator, 1837 // (parentheses around e are ignored), decltype(e) is defined as the 1838 // return type of that function. 1839 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 1840 return CE->getCallReturnType(); 1841 1842 QualType T = e->getType(); 1843 1844 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 1845 // defined as T&, otherwise decltype(e) is defined as T. 1846 if (e->isLvalue(Context) == Expr::LV_Valid) 1847 T = Context.getLValueReferenceType(T); 1848 1849 return T; 1850} 1851 1852/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 1853/// DecltypeType AST's. The only motivation to unique these nodes would be 1854/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 1855/// an issue. This doesn't effect the type checker, since it operates 1856/// on canonical type's (which are always unique). 1857QualType ASTContext::getDecltypeType(Expr *e) { 1858 DecltypeType *dt; 1859 if (e->isTypeDependent()) // FIXME: canonicalize the expression 1860 dt = new (*this, 8) DecltypeType(e, DependentTy); 1861 else { 1862 QualType T = getDecltypeForExpr(e, *this); 1863 dt = new (*this, 8) DecltypeType(e, T, getCanonicalType(T)); 1864 } 1865 Types.push_back(dt); 1866 return QualType(dt, 0); 1867} 1868 1869/// getTagDeclType - Return the unique reference to the type for the 1870/// specified TagDecl (struct/union/class/enum) decl. 1871QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1872 assert (Decl); 1873 return getTypeDeclType(Decl); 1874} 1875 1876/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1877/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1878/// needs to agree with the definition in <stddef.h>. 1879QualType ASTContext::getSizeType() const { 1880 return getFromTargetType(Target.getSizeType()); 1881} 1882 1883/// getSignedWCharType - Return the type of "signed wchar_t". 1884/// Used when in C++, as a GCC extension. 1885QualType ASTContext::getSignedWCharType() const { 1886 // FIXME: derive from "Target" ? 1887 return WCharTy; 1888} 1889 1890/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1891/// Used when in C++, as a GCC extension. 1892QualType ASTContext::getUnsignedWCharType() const { 1893 // FIXME: derive from "Target" ? 1894 return UnsignedIntTy; 1895} 1896 1897/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 1898/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 1899QualType ASTContext::getPointerDiffType() const { 1900 return getFromTargetType(Target.getPtrDiffType(0)); 1901} 1902 1903//===----------------------------------------------------------------------===// 1904// Type Operators 1905//===----------------------------------------------------------------------===// 1906 1907/// getCanonicalType - Return the canonical (structural) type corresponding to 1908/// the specified potentially non-canonical type. The non-canonical version 1909/// of a type may have many "decorated" versions of types. Decorators can 1910/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 1911/// to be free of any of these, allowing two canonical types to be compared 1912/// for exact equality with a simple pointer comparison. 1913QualType ASTContext::getCanonicalType(QualType T) { 1914 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 1915 1916 // If the result has type qualifiers, make sure to canonicalize them as well. 1917 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 1918 if (TypeQuals == 0) return CanType; 1919 1920 // If the type qualifiers are on an array type, get the canonical type of the 1921 // array with the qualifiers applied to the element type. 1922 ArrayType *AT = dyn_cast<ArrayType>(CanType); 1923 if (!AT) 1924 return CanType.getQualifiedType(TypeQuals); 1925 1926 // Get the canonical version of the element with the extra qualifiers on it. 1927 // This can recursively sink qualifiers through multiple levels of arrays. 1928 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 1929 NewEltTy = getCanonicalType(NewEltTy); 1930 1931 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1932 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 1933 CAT->getIndexTypeQualifier()); 1934 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 1935 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 1936 IAT->getIndexTypeQualifier()); 1937 1938 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 1939 return getDependentSizedArrayType(NewEltTy, 1940 DSAT->getSizeExpr(), 1941 DSAT->getSizeModifier(), 1942 DSAT->getIndexTypeQualifier(), 1943 DSAT->getBracketsRange()); 1944 1945 VariableArrayType *VAT = cast<VariableArrayType>(AT); 1946 return getVariableArrayType(NewEltTy, 1947 VAT->getSizeExpr(), 1948 VAT->getSizeModifier(), 1949 VAT->getIndexTypeQualifier(), 1950 VAT->getBracketsRange()); 1951} 1952 1953TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 1954 // If this template name refers to a template, the canonical 1955 // template name merely stores the template itself. 1956 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 1957 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 1958 1959 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 1960 assert(DTN && "Non-dependent template names must refer to template decls."); 1961 return DTN->CanonicalTemplateName; 1962} 1963 1964NestedNameSpecifier * 1965ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 1966 if (!NNS) 1967 return 0; 1968 1969 switch (NNS->getKind()) { 1970 case NestedNameSpecifier::Identifier: 1971 // Canonicalize the prefix but keep the identifier the same. 1972 return NestedNameSpecifier::Create(*this, 1973 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 1974 NNS->getAsIdentifier()); 1975 1976 case NestedNameSpecifier::Namespace: 1977 // A namespace is canonical; build a nested-name-specifier with 1978 // this namespace and no prefix. 1979 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 1980 1981 case NestedNameSpecifier::TypeSpec: 1982 case NestedNameSpecifier::TypeSpecWithTemplate: { 1983 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 1984 NestedNameSpecifier *Prefix = 0; 1985 1986 // FIXME: This isn't the right check! 1987 if (T->isDependentType()) 1988 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 1989 1990 return NestedNameSpecifier::Create(*this, Prefix, 1991 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 1992 T.getTypePtr()); 1993 } 1994 1995 case NestedNameSpecifier::Global: 1996 // The global specifier is canonical and unique. 1997 return NNS; 1998 } 1999 2000 // Required to silence a GCC warning 2001 return 0; 2002} 2003 2004 2005const ArrayType *ASTContext::getAsArrayType(QualType T) { 2006 // Handle the non-qualified case efficiently. 2007 if (T.getCVRQualifiers() == 0) { 2008 // Handle the common positive case fast. 2009 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2010 return AT; 2011 } 2012 2013 // Handle the common negative case fast, ignoring CVR qualifiers. 2014 QualType CType = T->getCanonicalTypeInternal(); 2015 2016 // Make sure to look through type qualifiers (like ExtQuals) for the negative 2017 // test. 2018 if (!isa<ArrayType>(CType) && 2019 !isa<ArrayType>(CType.getUnqualifiedType())) 2020 return 0; 2021 2022 // Apply any CVR qualifiers from the array type to the element type. This 2023 // implements C99 6.7.3p8: "If the specification of an array type includes 2024 // any type qualifiers, the element type is so qualified, not the array type." 2025 2026 // If we get here, we either have type qualifiers on the type, or we have 2027 // sugar such as a typedef in the way. If we have type qualifiers on the type 2028 // we must propagate them down into the elemeng type. 2029 unsigned CVRQuals = T.getCVRQualifiers(); 2030 unsigned AddrSpace = 0; 2031 Type *Ty = T.getTypePtr(); 2032 2033 // Rip through ExtQualType's and typedefs to get to a concrete type. 2034 while (1) { 2035 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 2036 AddrSpace = EXTQT->getAddressSpace(); 2037 Ty = EXTQT->getBaseType(); 2038 } else { 2039 T = Ty->getDesugaredType(); 2040 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 2041 break; 2042 CVRQuals |= T.getCVRQualifiers(); 2043 Ty = T.getTypePtr(); 2044 } 2045 } 2046 2047 // If we have a simple case, just return now. 2048 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2049 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 2050 return ATy; 2051 2052 // Otherwise, we have an array and we have qualifiers on it. Push the 2053 // qualifiers into the array element type and return a new array type. 2054 // Get the canonical version of the element with the extra qualifiers on it. 2055 // This can recursively sink qualifiers through multiple levels of arrays. 2056 QualType NewEltTy = ATy->getElementType(); 2057 if (AddrSpace) 2058 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 2059 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 2060 2061 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2062 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2063 CAT->getSizeModifier(), 2064 CAT->getIndexTypeQualifier())); 2065 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2066 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2067 IAT->getSizeModifier(), 2068 IAT->getIndexTypeQualifier())); 2069 2070 if (const DependentSizedArrayType *DSAT 2071 = dyn_cast<DependentSizedArrayType>(ATy)) 2072 return cast<ArrayType>( 2073 getDependentSizedArrayType(NewEltTy, 2074 DSAT->getSizeExpr(), 2075 DSAT->getSizeModifier(), 2076 DSAT->getIndexTypeQualifier(), 2077 DSAT->getBracketsRange())); 2078 2079 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2080 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2081 VAT->getSizeExpr(), 2082 VAT->getSizeModifier(), 2083 VAT->getIndexTypeQualifier(), 2084 VAT->getBracketsRange())); 2085} 2086 2087 2088/// getArrayDecayedType - Return the properly qualified result of decaying the 2089/// specified array type to a pointer. This operation is non-trivial when 2090/// handling typedefs etc. The canonical type of "T" must be an array type, 2091/// this returns a pointer to a properly qualified element of the array. 2092/// 2093/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2094QualType ASTContext::getArrayDecayedType(QualType Ty) { 2095 // Get the element type with 'getAsArrayType' so that we don't lose any 2096 // typedefs in the element type of the array. This also handles propagation 2097 // of type qualifiers from the array type into the element type if present 2098 // (C99 6.7.3p8). 2099 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2100 assert(PrettyArrayType && "Not an array type!"); 2101 2102 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2103 2104 // int x[restrict 4] -> int *restrict 2105 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 2106} 2107 2108QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 2109 QualType ElemTy = VAT->getElementType(); 2110 2111 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 2112 return getBaseElementType(VAT); 2113 2114 return ElemTy; 2115} 2116 2117/// getFloatingRank - Return a relative rank for floating point types. 2118/// This routine will assert if passed a built-in type that isn't a float. 2119static FloatingRank getFloatingRank(QualType T) { 2120 if (const ComplexType *CT = T->getAsComplexType()) 2121 return getFloatingRank(CT->getElementType()); 2122 2123 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 2124 switch (T->getAsBuiltinType()->getKind()) { 2125 default: assert(0 && "getFloatingRank(): not a floating type"); 2126 case BuiltinType::Float: return FloatRank; 2127 case BuiltinType::Double: return DoubleRank; 2128 case BuiltinType::LongDouble: return LongDoubleRank; 2129 } 2130} 2131 2132/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2133/// point or a complex type (based on typeDomain/typeSize). 2134/// 'typeDomain' is a real floating point or complex type. 2135/// 'typeSize' is a real floating point or complex type. 2136QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2137 QualType Domain) const { 2138 FloatingRank EltRank = getFloatingRank(Size); 2139 if (Domain->isComplexType()) { 2140 switch (EltRank) { 2141 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2142 case FloatRank: return FloatComplexTy; 2143 case DoubleRank: return DoubleComplexTy; 2144 case LongDoubleRank: return LongDoubleComplexTy; 2145 } 2146 } 2147 2148 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2149 switch (EltRank) { 2150 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2151 case FloatRank: return FloatTy; 2152 case DoubleRank: return DoubleTy; 2153 case LongDoubleRank: return LongDoubleTy; 2154 } 2155} 2156 2157/// getFloatingTypeOrder - Compare the rank of the two specified floating 2158/// point types, ignoring the domain of the type (i.e. 'double' == 2159/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2160/// LHS < RHS, return -1. 2161int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2162 FloatingRank LHSR = getFloatingRank(LHS); 2163 FloatingRank RHSR = getFloatingRank(RHS); 2164 2165 if (LHSR == RHSR) 2166 return 0; 2167 if (LHSR > RHSR) 2168 return 1; 2169 return -1; 2170} 2171 2172/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2173/// routine will assert if passed a built-in type that isn't an integer or enum, 2174/// or if it is not canonicalized. 2175unsigned ASTContext::getIntegerRank(Type *T) { 2176 assert(T->isCanonical() && "T should be canonicalized"); 2177 if (EnumType* ET = dyn_cast<EnumType>(T)) 2178 T = ET->getDecl()->getIntegerType().getTypePtr(); 2179 2180 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2181 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2182 2183 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2184 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2185 2186 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2187 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2188 2189 // There are two things which impact the integer rank: the width, and 2190 // the ordering of builtins. The builtin ordering is encoded in the 2191 // bottom three bits; the width is encoded in the bits above that. 2192 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2193 return FWIT->getWidth() << 3; 2194 2195 switch (cast<BuiltinType>(T)->getKind()) { 2196 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2197 case BuiltinType::Bool: 2198 return 1 + (getIntWidth(BoolTy) << 3); 2199 case BuiltinType::Char_S: 2200 case BuiltinType::Char_U: 2201 case BuiltinType::SChar: 2202 case BuiltinType::UChar: 2203 return 2 + (getIntWidth(CharTy) << 3); 2204 case BuiltinType::Short: 2205 case BuiltinType::UShort: 2206 return 3 + (getIntWidth(ShortTy) << 3); 2207 case BuiltinType::Int: 2208 case BuiltinType::UInt: 2209 return 4 + (getIntWidth(IntTy) << 3); 2210 case BuiltinType::Long: 2211 case BuiltinType::ULong: 2212 return 5 + (getIntWidth(LongTy) << 3); 2213 case BuiltinType::LongLong: 2214 case BuiltinType::ULongLong: 2215 return 6 + (getIntWidth(LongLongTy) << 3); 2216 case BuiltinType::Int128: 2217 case BuiltinType::UInt128: 2218 return 7 + (getIntWidth(Int128Ty) << 3); 2219 } 2220} 2221 2222/// getIntegerTypeOrder - Returns the highest ranked integer type: 2223/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2224/// LHS < RHS, return -1. 2225int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2226 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2227 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2228 if (LHSC == RHSC) return 0; 2229 2230 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2231 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2232 2233 unsigned LHSRank = getIntegerRank(LHSC); 2234 unsigned RHSRank = getIntegerRank(RHSC); 2235 2236 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2237 if (LHSRank == RHSRank) return 0; 2238 return LHSRank > RHSRank ? 1 : -1; 2239 } 2240 2241 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2242 if (LHSUnsigned) { 2243 // If the unsigned [LHS] type is larger, return it. 2244 if (LHSRank >= RHSRank) 2245 return 1; 2246 2247 // If the signed type can represent all values of the unsigned type, it 2248 // wins. Because we are dealing with 2's complement and types that are 2249 // powers of two larger than each other, this is always safe. 2250 return -1; 2251 } 2252 2253 // If the unsigned [RHS] type is larger, return it. 2254 if (RHSRank >= LHSRank) 2255 return -1; 2256 2257 // If the signed type can represent all values of the unsigned type, it 2258 // wins. Because we are dealing with 2's complement and types that are 2259 // powers of two larger than each other, this is always safe. 2260 return 1; 2261} 2262 2263// getCFConstantStringType - Return the type used for constant CFStrings. 2264QualType ASTContext::getCFConstantStringType() { 2265 if (!CFConstantStringTypeDecl) { 2266 CFConstantStringTypeDecl = 2267 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2268 &Idents.get("NSConstantString")); 2269 QualType FieldTypes[4]; 2270 2271 // const int *isa; 2272 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2273 // int flags; 2274 FieldTypes[1] = IntTy; 2275 // const char *str; 2276 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2277 // long length; 2278 FieldTypes[3] = LongTy; 2279 2280 // Create fields 2281 for (unsigned i = 0; i < 4; ++i) { 2282 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2283 SourceLocation(), 0, 2284 FieldTypes[i], /*BitWidth=*/0, 2285 /*Mutable=*/false); 2286 CFConstantStringTypeDecl->addDecl(Field); 2287 } 2288 2289 CFConstantStringTypeDecl->completeDefinition(*this); 2290 } 2291 2292 return getTagDeclType(CFConstantStringTypeDecl); 2293} 2294 2295void ASTContext::setCFConstantStringType(QualType T) { 2296 const RecordType *Rec = T->getAsRecordType(); 2297 assert(Rec && "Invalid CFConstantStringType"); 2298 CFConstantStringTypeDecl = Rec->getDecl(); 2299} 2300 2301QualType ASTContext::getObjCFastEnumerationStateType() 2302{ 2303 if (!ObjCFastEnumerationStateTypeDecl) { 2304 ObjCFastEnumerationStateTypeDecl = 2305 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2306 &Idents.get("__objcFastEnumerationState")); 2307 2308 QualType FieldTypes[] = { 2309 UnsignedLongTy, 2310 getPointerType(ObjCIdTypedefType), 2311 getPointerType(UnsignedLongTy), 2312 getConstantArrayType(UnsignedLongTy, 2313 llvm::APInt(32, 5), ArrayType::Normal, 0) 2314 }; 2315 2316 for (size_t i = 0; i < 4; ++i) { 2317 FieldDecl *Field = FieldDecl::Create(*this, 2318 ObjCFastEnumerationStateTypeDecl, 2319 SourceLocation(), 0, 2320 FieldTypes[i], /*BitWidth=*/0, 2321 /*Mutable=*/false); 2322 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2323 } 2324 2325 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2326 } 2327 2328 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2329} 2330 2331void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2332 const RecordType *Rec = T->getAsRecordType(); 2333 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2334 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2335} 2336 2337// This returns true if a type has been typedefed to BOOL: 2338// typedef <type> BOOL; 2339static bool isTypeTypedefedAsBOOL(QualType T) { 2340 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2341 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2342 return II->isStr("BOOL"); 2343 2344 return false; 2345} 2346 2347/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2348/// purpose. 2349int ASTContext::getObjCEncodingTypeSize(QualType type) { 2350 uint64_t sz = getTypeSize(type); 2351 2352 // Make all integer and enum types at least as large as an int 2353 if (sz > 0 && type->isIntegralType()) 2354 sz = std::max(sz, getTypeSize(IntTy)); 2355 // Treat arrays as pointers, since that's how they're passed in. 2356 else if (type->isArrayType()) 2357 sz = getTypeSize(VoidPtrTy); 2358 return sz / getTypeSize(CharTy); 2359} 2360 2361/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2362/// declaration. 2363void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2364 std::string& S) { 2365 // FIXME: This is not very efficient. 2366 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2367 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2368 // Encode result type. 2369 getObjCEncodingForType(Decl->getResultType(), S); 2370 // Compute size of all parameters. 2371 // Start with computing size of a pointer in number of bytes. 2372 // FIXME: There might(should) be a better way of doing this computation! 2373 SourceLocation Loc; 2374 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2375 // The first two arguments (self and _cmd) are pointers; account for 2376 // their size. 2377 int ParmOffset = 2 * PtrSize; 2378 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2379 E = Decl->param_end(); PI != E; ++PI) { 2380 QualType PType = (*PI)->getType(); 2381 int sz = getObjCEncodingTypeSize(PType); 2382 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2383 ParmOffset += sz; 2384 } 2385 S += llvm::utostr(ParmOffset); 2386 S += "@0:"; 2387 S += llvm::utostr(PtrSize); 2388 2389 // Argument types. 2390 ParmOffset = 2 * PtrSize; 2391 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2392 E = Decl->param_end(); PI != E; ++PI) { 2393 ParmVarDecl *PVDecl = *PI; 2394 QualType PType = PVDecl->getOriginalType(); 2395 if (const ArrayType *AT = 2396 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2397 // Use array's original type only if it has known number of 2398 // elements. 2399 if (!isa<ConstantArrayType>(AT)) 2400 PType = PVDecl->getType(); 2401 } else if (PType->isFunctionType()) 2402 PType = PVDecl->getType(); 2403 // Process argument qualifiers for user supplied arguments; such as, 2404 // 'in', 'inout', etc. 2405 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2406 getObjCEncodingForType(PType, S); 2407 S += llvm::utostr(ParmOffset); 2408 ParmOffset += getObjCEncodingTypeSize(PType); 2409 } 2410} 2411 2412/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2413/// property declaration. If non-NULL, Container must be either an 2414/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2415/// NULL when getting encodings for protocol properties. 2416/// Property attributes are stored as a comma-delimited C string. The simple 2417/// attributes readonly and bycopy are encoded as single characters. The 2418/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2419/// encoded as single characters, followed by an identifier. Property types 2420/// are also encoded as a parametrized attribute. The characters used to encode 2421/// these attributes are defined by the following enumeration: 2422/// @code 2423/// enum PropertyAttributes { 2424/// kPropertyReadOnly = 'R', // property is read-only. 2425/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2426/// kPropertyByref = '&', // property is a reference to the value last assigned 2427/// kPropertyDynamic = 'D', // property is dynamic 2428/// kPropertyGetter = 'G', // followed by getter selector name 2429/// kPropertySetter = 'S', // followed by setter selector name 2430/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2431/// kPropertyType = 't' // followed by old-style type encoding. 2432/// kPropertyWeak = 'W' // 'weak' property 2433/// kPropertyStrong = 'P' // property GC'able 2434/// kPropertyNonAtomic = 'N' // property non-atomic 2435/// }; 2436/// @endcode 2437void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2438 const Decl *Container, 2439 std::string& S) { 2440 // Collect information from the property implementation decl(s). 2441 bool Dynamic = false; 2442 ObjCPropertyImplDecl *SynthesizePID = 0; 2443 2444 // FIXME: Duplicated code due to poor abstraction. 2445 if (Container) { 2446 if (const ObjCCategoryImplDecl *CID = 2447 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2448 for (ObjCCategoryImplDecl::propimpl_iterator 2449 i = CID->propimpl_begin(), e = CID->propimpl_end(); 2450 i != e; ++i) { 2451 ObjCPropertyImplDecl *PID = *i; 2452 if (PID->getPropertyDecl() == PD) { 2453 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2454 Dynamic = true; 2455 } else { 2456 SynthesizePID = PID; 2457 } 2458 } 2459 } 2460 } else { 2461 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2462 for (ObjCCategoryImplDecl::propimpl_iterator 2463 i = OID->propimpl_begin(), e = OID->propimpl_end(); 2464 i != e; ++i) { 2465 ObjCPropertyImplDecl *PID = *i; 2466 if (PID->getPropertyDecl() == PD) { 2467 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2468 Dynamic = true; 2469 } else { 2470 SynthesizePID = PID; 2471 } 2472 } 2473 } 2474 } 2475 } 2476 2477 // FIXME: This is not very efficient. 2478 S = "T"; 2479 2480 // Encode result type. 2481 // GCC has some special rules regarding encoding of properties which 2482 // closely resembles encoding of ivars. 2483 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2484 true /* outermost type */, 2485 true /* encoding for property */); 2486 2487 if (PD->isReadOnly()) { 2488 S += ",R"; 2489 } else { 2490 switch (PD->getSetterKind()) { 2491 case ObjCPropertyDecl::Assign: break; 2492 case ObjCPropertyDecl::Copy: S += ",C"; break; 2493 case ObjCPropertyDecl::Retain: S += ",&"; break; 2494 } 2495 } 2496 2497 // It really isn't clear at all what this means, since properties 2498 // are "dynamic by default". 2499 if (Dynamic) 2500 S += ",D"; 2501 2502 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2503 S += ",N"; 2504 2505 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2506 S += ",G"; 2507 S += PD->getGetterName().getAsString(); 2508 } 2509 2510 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2511 S += ",S"; 2512 S += PD->getSetterName().getAsString(); 2513 } 2514 2515 if (SynthesizePID) { 2516 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2517 S += ",V"; 2518 S += OID->getNameAsString(); 2519 } 2520 2521 // FIXME: OBJCGC: weak & strong 2522} 2523 2524/// getLegacyIntegralTypeEncoding - 2525/// Another legacy compatibility encoding: 32-bit longs are encoded as 2526/// 'l' or 'L' , but not always. For typedefs, we need to use 2527/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2528/// 2529void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2530 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 2531 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2532 if (BT->getKind() == BuiltinType::ULong && 2533 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2534 PointeeTy = UnsignedIntTy; 2535 else 2536 if (BT->getKind() == BuiltinType::Long && 2537 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2538 PointeeTy = IntTy; 2539 } 2540 } 2541} 2542 2543void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2544 const FieldDecl *Field) { 2545 // We follow the behavior of gcc, expanding structures which are 2546 // directly pointed to, and expanding embedded structures. Note that 2547 // these rules are sufficient to prevent recursive encoding of the 2548 // same type. 2549 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2550 true /* outermost type */); 2551} 2552 2553static void EncodeBitField(const ASTContext *Context, std::string& S, 2554 const FieldDecl *FD) { 2555 const Expr *E = FD->getBitWidth(); 2556 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2557 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2558 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2559 S += 'b'; 2560 S += llvm::utostr(N); 2561} 2562 2563void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2564 bool ExpandPointedToStructures, 2565 bool ExpandStructures, 2566 const FieldDecl *FD, 2567 bool OutermostType, 2568 bool EncodingProperty) { 2569 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2570 if (FD && FD->isBitField()) 2571 return EncodeBitField(this, S, FD); 2572 char encoding; 2573 switch (BT->getKind()) { 2574 default: assert(0 && "Unhandled builtin type kind"); 2575 case BuiltinType::Void: encoding = 'v'; break; 2576 case BuiltinType::Bool: encoding = 'B'; break; 2577 case BuiltinType::Char_U: 2578 case BuiltinType::UChar: encoding = 'C'; break; 2579 case BuiltinType::UShort: encoding = 'S'; break; 2580 case BuiltinType::UInt: encoding = 'I'; break; 2581 case BuiltinType::ULong: 2582 encoding = 2583 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2584 break; 2585 case BuiltinType::UInt128: encoding = 'T'; break; 2586 case BuiltinType::ULongLong: encoding = 'Q'; break; 2587 case BuiltinType::Char_S: 2588 case BuiltinType::SChar: encoding = 'c'; break; 2589 case BuiltinType::Short: encoding = 's'; break; 2590 case BuiltinType::Int: encoding = 'i'; break; 2591 case BuiltinType::Long: 2592 encoding = 2593 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2594 break; 2595 case BuiltinType::LongLong: encoding = 'q'; break; 2596 case BuiltinType::Int128: encoding = 't'; break; 2597 case BuiltinType::Float: encoding = 'f'; break; 2598 case BuiltinType::Double: encoding = 'd'; break; 2599 case BuiltinType::LongDouble: encoding = 'd'; break; 2600 } 2601 2602 S += encoding; 2603 return; 2604 } 2605 2606 if (const ComplexType *CT = T->getAsComplexType()) { 2607 S += 'j'; 2608 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2609 false); 2610 return; 2611 } 2612 2613 if (const PointerType *PT = T->getAsPointerType()) { 2614 QualType PointeeTy = PT->getPointeeType(); 2615 bool isReadOnly = false; 2616 // For historical/compatibility reasons, the read-only qualifier of the 2617 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2618 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2619 // Also, do not emit the 'r' for anything but the outermost type! 2620 if (dyn_cast<TypedefType>(T.getTypePtr())) { 2621 if (OutermostType && T.isConstQualified()) { 2622 isReadOnly = true; 2623 S += 'r'; 2624 } 2625 } 2626 else if (OutermostType) { 2627 QualType P = PointeeTy; 2628 while (P->getAsPointerType()) 2629 P = P->getAsPointerType()->getPointeeType(); 2630 if (P.isConstQualified()) { 2631 isReadOnly = true; 2632 S += 'r'; 2633 } 2634 } 2635 if (isReadOnly) { 2636 // Another legacy compatibility encoding. Some ObjC qualifier and type 2637 // combinations need to be rearranged. 2638 // Rewrite "in const" from "nr" to "rn" 2639 const char * s = S.c_str(); 2640 int len = S.length(); 2641 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2642 std::string replace = "rn"; 2643 S.replace(S.end()-2, S.end(), replace); 2644 } 2645 } 2646 if (isObjCSelType(PointeeTy)) { 2647 S += ':'; 2648 return; 2649 } 2650 2651 if (PointeeTy->isCharType()) { 2652 // char pointer types should be encoded as '*' unless it is a 2653 // type that has been typedef'd to 'BOOL'. 2654 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2655 S += '*'; 2656 return; 2657 } 2658 } 2659 2660 S += '^'; 2661 getLegacyIntegralTypeEncoding(PointeeTy); 2662 2663 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 2664 NULL); 2665 return; 2666 } 2667 2668 if (const ArrayType *AT = 2669 // Ignore type qualifiers etc. 2670 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2671 if (isa<IncompleteArrayType>(AT)) { 2672 // Incomplete arrays are encoded as a pointer to the array element. 2673 S += '^'; 2674 2675 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2676 false, ExpandStructures, FD); 2677 } else { 2678 S += '['; 2679 2680 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2681 S += llvm::utostr(CAT->getSize().getZExtValue()); 2682 else { 2683 //Variable length arrays are encoded as a regular array with 0 elements. 2684 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2685 S += '0'; 2686 } 2687 2688 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2689 false, ExpandStructures, FD); 2690 S += ']'; 2691 } 2692 return; 2693 } 2694 2695 if (T->getAsFunctionType()) { 2696 S += '?'; 2697 return; 2698 } 2699 2700 if (const RecordType *RTy = T->getAsRecordType()) { 2701 RecordDecl *RDecl = RTy->getDecl(); 2702 S += RDecl->isUnion() ? '(' : '{'; 2703 // Anonymous structures print as '?' 2704 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2705 S += II->getName(); 2706 } else { 2707 S += '?'; 2708 } 2709 if (ExpandStructures) { 2710 S += '='; 2711 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 2712 FieldEnd = RDecl->field_end(); 2713 Field != FieldEnd; ++Field) { 2714 if (FD) { 2715 S += '"'; 2716 S += Field->getNameAsString(); 2717 S += '"'; 2718 } 2719 2720 // Special case bit-fields. 2721 if (Field->isBitField()) { 2722 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2723 (*Field)); 2724 } else { 2725 QualType qt = Field->getType(); 2726 getLegacyIntegralTypeEncoding(qt); 2727 getObjCEncodingForTypeImpl(qt, S, false, true, 2728 FD); 2729 } 2730 } 2731 } 2732 S += RDecl->isUnion() ? ')' : '}'; 2733 return; 2734 } 2735 2736 if (T->isEnumeralType()) { 2737 if (FD && FD->isBitField()) 2738 EncodeBitField(this, S, FD); 2739 else 2740 S += 'i'; 2741 return; 2742 } 2743 2744 if (T->isBlockPointerType()) { 2745 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2746 return; 2747 } 2748 2749 if (T->isObjCInterfaceType()) { 2750 // @encode(class_name) 2751 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2752 S += '{'; 2753 const IdentifierInfo *II = OI->getIdentifier(); 2754 S += II->getName(); 2755 S += '='; 2756 llvm::SmallVector<FieldDecl*, 32> RecFields; 2757 CollectObjCIvars(OI, RecFields); 2758 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2759 if (RecFields[i]->isBitField()) 2760 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2761 RecFields[i]); 2762 else 2763 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2764 FD); 2765 } 2766 S += '}'; 2767 return; 2768 } 2769 2770 if (const ObjCObjectPointerType *OPT = T->getAsObjCObjectPointerType()) { 2771 if (OPT->isObjCIdType()) { 2772 S += '@'; 2773 return; 2774 } 2775 2776 if (OPT->isObjCClassType()) { 2777 S += '#'; 2778 return; 2779 } 2780 2781 if (OPT->isObjCQualifiedIdType()) { 2782 getObjCEncodingForTypeImpl(getObjCIdType(), S, 2783 ExpandPointedToStructures, 2784 ExpandStructures, FD); 2785 if (FD || EncodingProperty) { 2786 // Note that we do extended encoding of protocol qualifer list 2787 // Only when doing ivar or property encoding. 2788 S += '"'; 2789 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2790 E = OPT->qual_end(); I != E; ++I) { 2791 S += '<'; 2792 S += (*I)->getNameAsString(); 2793 S += '>'; 2794 } 2795 S += '"'; 2796 } 2797 return; 2798 } 2799 2800 QualType PointeeTy = OPT->getPointeeType(); 2801 if (!EncodingProperty && 2802 isa<TypedefType>(PointeeTy.getTypePtr())) { 2803 // Another historical/compatibility reason. 2804 // We encode the underlying type which comes out as 2805 // {...}; 2806 S += '^'; 2807 getObjCEncodingForTypeImpl(PointeeTy, S, 2808 false, ExpandPointedToStructures, 2809 NULL); 2810 return; 2811 } 2812 2813 S += '@'; 2814 if (FD || EncodingProperty) { 2815 S += '"'; 2816 S += OPT->getInterfaceDecl()->getNameAsCString(); 2817 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2818 E = OPT->qual_end(); I != E; ++I) { 2819 S += '<'; 2820 S += (*I)->getNameAsString(); 2821 S += '>'; 2822 } 2823 S += '"'; 2824 } 2825 return; 2826 } 2827 2828 assert(0 && "@encode for type not implemented!"); 2829} 2830 2831void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2832 std::string& S) const { 2833 if (QT & Decl::OBJC_TQ_In) 2834 S += 'n'; 2835 if (QT & Decl::OBJC_TQ_Inout) 2836 S += 'N'; 2837 if (QT & Decl::OBJC_TQ_Out) 2838 S += 'o'; 2839 if (QT & Decl::OBJC_TQ_Bycopy) 2840 S += 'O'; 2841 if (QT & Decl::OBJC_TQ_Byref) 2842 S += 'R'; 2843 if (QT & Decl::OBJC_TQ_Oneway) 2844 S += 'V'; 2845} 2846 2847void ASTContext::setBuiltinVaListType(QualType T) { 2848 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2849 2850 BuiltinVaListType = T; 2851} 2852 2853void ASTContext::setObjCIdType(QualType T) { 2854 ObjCIdTypedefType = T; 2855} 2856 2857void ASTContext::setObjCSelType(QualType T) { 2858 ObjCSelType = T; 2859 2860 const TypedefType *TT = T->getAsTypedefType(); 2861 if (!TT) 2862 return; 2863 TypedefDecl *TD = TT->getDecl(); 2864 2865 // typedef struct objc_selector *SEL; 2866 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2867 if (!ptr) 2868 return; 2869 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2870 if (!rec) 2871 return; 2872 SelStructType = rec; 2873} 2874 2875void ASTContext::setObjCProtoType(QualType QT) { 2876 ObjCProtoType = QT; 2877} 2878 2879void ASTContext::setObjCClassType(QualType T) { 2880 ObjCClassTypedefType = T; 2881} 2882 2883void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 2884 assert(ObjCConstantStringType.isNull() && 2885 "'NSConstantString' type already set!"); 2886 2887 ObjCConstantStringType = getObjCInterfaceType(Decl); 2888} 2889 2890/// \brief Retrieve the template name that represents a qualified 2891/// template name such as \c std::vector. 2892TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 2893 bool TemplateKeyword, 2894 TemplateDecl *Template) { 2895 llvm::FoldingSetNodeID ID; 2896 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 2897 2898 void *InsertPos = 0; 2899 QualifiedTemplateName *QTN = 2900 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2901 if (!QTN) { 2902 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 2903 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 2904 } 2905 2906 return TemplateName(QTN); 2907} 2908 2909/// \brief Retrieve the template name that represents a dependent 2910/// template name such as \c MetaFun::template apply. 2911TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 2912 const IdentifierInfo *Name) { 2913 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 2914 2915 llvm::FoldingSetNodeID ID; 2916 DependentTemplateName::Profile(ID, NNS, Name); 2917 2918 void *InsertPos = 0; 2919 DependentTemplateName *QTN = 2920 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 2921 2922 if (QTN) 2923 return TemplateName(QTN); 2924 2925 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2926 if (CanonNNS == NNS) { 2927 QTN = new (*this,4) DependentTemplateName(NNS, Name); 2928 } else { 2929 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 2930 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 2931 } 2932 2933 DependentTemplateNames.InsertNode(QTN, InsertPos); 2934 return TemplateName(QTN); 2935} 2936 2937/// getFromTargetType - Given one of the integer types provided by 2938/// TargetInfo, produce the corresponding type. The unsigned @p Type 2939/// is actually a value of type @c TargetInfo::IntType. 2940QualType ASTContext::getFromTargetType(unsigned Type) const { 2941 switch (Type) { 2942 case TargetInfo::NoInt: return QualType(); 2943 case TargetInfo::SignedShort: return ShortTy; 2944 case TargetInfo::UnsignedShort: return UnsignedShortTy; 2945 case TargetInfo::SignedInt: return IntTy; 2946 case TargetInfo::UnsignedInt: return UnsignedIntTy; 2947 case TargetInfo::SignedLong: return LongTy; 2948 case TargetInfo::UnsignedLong: return UnsignedLongTy; 2949 case TargetInfo::SignedLongLong: return LongLongTy; 2950 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 2951 } 2952 2953 assert(false && "Unhandled TargetInfo::IntType value"); 2954 return QualType(); 2955} 2956 2957//===----------------------------------------------------------------------===// 2958// Type Predicates. 2959//===----------------------------------------------------------------------===// 2960 2961/// isObjCNSObjectType - Return true if this is an NSObject object using 2962/// NSObject attribute on a c-style pointer type. 2963/// FIXME - Make it work directly on types. 2964/// FIXME: Move to Type. 2965/// 2966bool ASTContext::isObjCNSObjectType(QualType Ty) const { 2967 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2968 if (TypedefDecl *TD = TDT->getDecl()) 2969 if (TD->getAttr<ObjCNSObjectAttr>()) 2970 return true; 2971 } 2972 return false; 2973} 2974 2975/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 2976/// garbage collection attribute. 2977/// 2978QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 2979 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 2980 if (getLangOptions().ObjC1 && 2981 getLangOptions().getGCMode() != LangOptions::NonGC) { 2982 GCAttrs = Ty.getObjCGCAttr(); 2983 // Default behavious under objective-c's gc is for objective-c pointers 2984 // (or pointers to them) be treated as though they were declared 2985 // as __strong. 2986 if (GCAttrs == QualType::GCNone) { 2987 if (Ty->isObjCObjectPointerType()) 2988 GCAttrs = QualType::Strong; 2989 else if (Ty->isPointerType()) 2990 return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType()); 2991 } 2992 // Non-pointers have none gc'able attribute regardless of the attribute 2993 // set on them. 2994 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 2995 return QualType::GCNone; 2996 } 2997 return GCAttrs; 2998} 2999 3000//===----------------------------------------------------------------------===// 3001// Type Compatibility Testing 3002//===----------------------------------------------------------------------===// 3003 3004/// areCompatVectorTypes - Return true if the two specified vector types are 3005/// compatible. 3006static bool areCompatVectorTypes(const VectorType *LHS, 3007 const VectorType *RHS) { 3008 assert(LHS->isCanonical() && RHS->isCanonical()); 3009 return LHS->getElementType() == RHS->getElementType() && 3010 LHS->getNumElements() == RHS->getNumElements(); 3011} 3012 3013/// canAssignObjCInterfaces - Return true if the two interface types are 3014/// compatible for assignment from RHS to LHS. This handles validation of any 3015/// protocol qualifiers on the LHS or RHS. 3016/// 3017/// FIXME: Move the following to ObjCObjectPointerType/ObjCInterfaceType. 3018bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3019 const ObjCObjectPointerType *RHSOPT) { 3020 // If either type represents the built-in 'id' or 'Class' types, return true. 3021 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3022 return true; 3023 3024 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3025 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3026 if (!LHS || !RHS) { 3027 // We have qualified builtin types. 3028 // Both the right and left sides have qualifiers. 3029 for (ObjCObjectPointerType::qual_iterator I = LHSOPT->qual_begin(), 3030 E = LHSOPT->qual_end(); I != E; ++I) { 3031 bool RHSImplementsProtocol = false; 3032 3033 // when comparing an id<P> on lhs with a static type on rhs, 3034 // see if static class implements all of id's protocols, directly or 3035 // through its super class and categories. 3036 for (ObjCObjectPointerType::qual_iterator J = RHSOPT->qual_begin(), 3037 E = RHSOPT->qual_end(); J != E; ++J) { 3038 if ((*J)->lookupProtocolNamed((*I)->getIdentifier())) { 3039 RHSImplementsProtocol = true; 3040 break; 3041 } 3042 } 3043 if (!RHSImplementsProtocol) 3044 return false; 3045 } 3046 // The RHS implements all protocols listed on the LHS. 3047 return true; 3048 } 3049 return canAssignObjCInterfaces(LHS, RHS); 3050} 3051 3052bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3053 const ObjCInterfaceType *RHS) { 3054 // Verify that the base decls are compatible: the RHS must be a subclass of 3055 // the LHS. 3056 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3057 return false; 3058 3059 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3060 // protocol qualified at all, then we are good. 3061 if (LHS->getNumProtocols() == 0) 3062 return true; 3063 3064 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3065 // isn't a superset. 3066 if (RHS->getNumProtocols() == 0) 3067 return true; // FIXME: should return false! 3068 3069 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3070 LHSPE = LHS->qual_end(); 3071 LHSPI != LHSPE; LHSPI++) { 3072 bool RHSImplementsProtocol = false; 3073 3074 // If the RHS doesn't implement the protocol on the left, the types 3075 // are incompatible. 3076 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3077 RHSPE = RHS->qual_end(); 3078 RHSPI != RHSPE; RHSPI++) { 3079 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3080 RHSImplementsProtocol = true; 3081 break; 3082 } 3083 } 3084 // FIXME: For better diagnostics, consider passing back the protocol name. 3085 if (!RHSImplementsProtocol) 3086 return false; 3087 } 3088 // The RHS implements all protocols listed on the LHS. 3089 return true; 3090} 3091 3092bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3093 // get the "pointed to" types 3094 const ObjCObjectPointerType *LHSOPT = LHS->getAsObjCObjectPointerType(); 3095 const ObjCObjectPointerType *RHSOPT = RHS->getAsObjCObjectPointerType(); 3096 3097 if (!LHSOPT || !RHSOPT) 3098 return false; 3099 3100 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3101 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3102} 3103 3104/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3105/// both shall have the identically qualified version of a compatible type. 3106/// C99 6.2.7p1: Two types have compatible types if their types are the 3107/// same. See 6.7.[2,3,5] for additional rules. 3108bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3109 return !mergeTypes(LHS, RHS).isNull(); 3110} 3111 3112QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3113 const FunctionType *lbase = lhs->getAsFunctionType(); 3114 const FunctionType *rbase = rhs->getAsFunctionType(); 3115 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3116 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3117 bool allLTypes = true; 3118 bool allRTypes = true; 3119 3120 // Check return type 3121 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3122 if (retType.isNull()) return QualType(); 3123 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3124 allLTypes = false; 3125 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3126 allRTypes = false; 3127 3128 if (lproto && rproto) { // two C99 style function prototypes 3129 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3130 "C++ shouldn't be here"); 3131 unsigned lproto_nargs = lproto->getNumArgs(); 3132 unsigned rproto_nargs = rproto->getNumArgs(); 3133 3134 // Compatible functions must have the same number of arguments 3135 if (lproto_nargs != rproto_nargs) 3136 return QualType(); 3137 3138 // Variadic and non-variadic functions aren't compatible 3139 if (lproto->isVariadic() != rproto->isVariadic()) 3140 return QualType(); 3141 3142 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3143 return QualType(); 3144 3145 // Check argument compatibility 3146 llvm::SmallVector<QualType, 10> types; 3147 for (unsigned i = 0; i < lproto_nargs; i++) { 3148 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3149 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3150 QualType argtype = mergeTypes(largtype, rargtype); 3151 if (argtype.isNull()) return QualType(); 3152 types.push_back(argtype); 3153 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3154 allLTypes = false; 3155 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3156 allRTypes = false; 3157 } 3158 if (allLTypes) return lhs; 3159 if (allRTypes) return rhs; 3160 return getFunctionType(retType, types.begin(), types.size(), 3161 lproto->isVariadic(), lproto->getTypeQuals()); 3162 } 3163 3164 if (lproto) allRTypes = false; 3165 if (rproto) allLTypes = false; 3166 3167 const FunctionProtoType *proto = lproto ? lproto : rproto; 3168 if (proto) { 3169 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3170 if (proto->isVariadic()) return QualType(); 3171 // Check that the types are compatible with the types that 3172 // would result from default argument promotions (C99 6.7.5.3p15). 3173 // The only types actually affected are promotable integer 3174 // types and floats, which would be passed as a different 3175 // type depending on whether the prototype is visible. 3176 unsigned proto_nargs = proto->getNumArgs(); 3177 for (unsigned i = 0; i < proto_nargs; ++i) { 3178 QualType argTy = proto->getArgType(i); 3179 if (argTy->isPromotableIntegerType() || 3180 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3181 return QualType(); 3182 } 3183 3184 if (allLTypes) return lhs; 3185 if (allRTypes) return rhs; 3186 return getFunctionType(retType, proto->arg_type_begin(), 3187 proto->getNumArgs(), lproto->isVariadic(), 3188 lproto->getTypeQuals()); 3189 } 3190 3191 if (allLTypes) return lhs; 3192 if (allRTypes) return rhs; 3193 return getFunctionNoProtoType(retType); 3194} 3195 3196QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3197 // C++ [expr]: If an expression initially has the type "reference to T", the 3198 // type is adjusted to "T" prior to any further analysis, the expression 3199 // designates the object or function denoted by the reference, and the 3200 // expression is an lvalue unless the reference is an rvalue reference and 3201 // the expression is a function call (possibly inside parentheses). 3202 // FIXME: C++ shouldn't be going through here! The rules are different 3203 // enough that they should be handled separately. 3204 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3205 // shouldn't be going through here! 3206 if (const ReferenceType *RT = LHS->getAsReferenceType()) 3207 LHS = RT->getPointeeType(); 3208 if (const ReferenceType *RT = RHS->getAsReferenceType()) 3209 RHS = RT->getPointeeType(); 3210 3211 QualType LHSCan = getCanonicalType(LHS), 3212 RHSCan = getCanonicalType(RHS); 3213 3214 // If two types are identical, they are compatible. 3215 if (LHSCan == RHSCan) 3216 return LHS; 3217 3218 // If the qualifiers are different, the types aren't compatible 3219 // Note that we handle extended qualifiers later, in the 3220 // case for ExtQualType. 3221 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3222 return QualType(); 3223 3224 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3225 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3226 3227 // We want to consider the two function types to be the same for these 3228 // comparisons, just force one to the other. 3229 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3230 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3231 3232 // Strip off objc_gc attributes off the top level so they can be merged. 3233 // This is a complete mess, but the attribute itself doesn't make much sense. 3234 if (RHSClass == Type::ExtQual) { 3235 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3236 if (GCAttr != QualType::GCNone) { 3237 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3238 // __weak attribute must appear on both declarations. 3239 // __strong attribue is redundant if other decl is an objective-c 3240 // object pointer (or decorated with __strong attribute); otherwise 3241 // issue error. 3242 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3243 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3244 !LHSCan->isObjCObjectPointerType())) 3245 return QualType(); 3246 3247 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3248 RHS.getCVRQualifiers()); 3249 QualType Result = mergeTypes(LHS, RHS); 3250 if (!Result.isNull()) { 3251 if (Result.getObjCGCAttr() == QualType::GCNone) 3252 Result = getObjCGCQualType(Result, GCAttr); 3253 else if (Result.getObjCGCAttr() != GCAttr) 3254 Result = QualType(); 3255 } 3256 return Result; 3257 } 3258 } 3259 if (LHSClass == Type::ExtQual) { 3260 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3261 if (GCAttr != QualType::GCNone) { 3262 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3263 // __weak attribute must appear on both declarations. __strong 3264 // __strong attribue is redundant if other decl is an objective-c 3265 // object pointer (or decorated with __strong attribute); otherwise 3266 // issue error. 3267 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3268 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3269 !RHSCan->isObjCObjectPointerType())) 3270 return QualType(); 3271 3272 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3273 LHS.getCVRQualifiers()); 3274 QualType Result = mergeTypes(LHS, RHS); 3275 if (!Result.isNull()) { 3276 if (Result.getObjCGCAttr() == QualType::GCNone) 3277 Result = getObjCGCQualType(Result, GCAttr); 3278 else if (Result.getObjCGCAttr() != GCAttr) 3279 Result = QualType(); 3280 } 3281 return Result; 3282 } 3283 } 3284 3285 // Same as above for arrays 3286 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3287 LHSClass = Type::ConstantArray; 3288 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3289 RHSClass = Type::ConstantArray; 3290 3291 // Canonicalize ExtVector -> Vector. 3292 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3293 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3294 3295 // If the canonical type classes don't match. 3296 if (LHSClass != RHSClass) { 3297 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3298 // a signed integer type, or an unsigned integer type. 3299 if (const EnumType* ETy = LHS->getAsEnumType()) { 3300 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3301 return RHS; 3302 } 3303 if (const EnumType* ETy = RHS->getAsEnumType()) { 3304 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3305 return LHS; 3306 } 3307 3308 return QualType(); 3309 } 3310 3311 // The canonical type classes match. 3312 switch (LHSClass) { 3313#define TYPE(Class, Base) 3314#define ABSTRACT_TYPE(Class, Base) 3315#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3316#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3317#include "clang/AST/TypeNodes.def" 3318 assert(false && "Non-canonical and dependent types shouldn't get here"); 3319 return QualType(); 3320 3321 case Type::LValueReference: 3322 case Type::RValueReference: 3323 case Type::MemberPointer: 3324 assert(false && "C++ should never be in mergeTypes"); 3325 return QualType(); 3326 3327 case Type::IncompleteArray: 3328 case Type::VariableArray: 3329 case Type::FunctionProto: 3330 case Type::ExtVector: 3331 assert(false && "Types are eliminated above"); 3332 return QualType(); 3333 3334 case Type::Pointer: 3335 { 3336 // Merge two pointer types, while trying to preserve typedef info 3337 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 3338 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 3339 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3340 if (ResultType.isNull()) return QualType(); 3341 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3342 return LHS; 3343 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3344 return RHS; 3345 return getPointerType(ResultType); 3346 } 3347 case Type::BlockPointer: 3348 { 3349 // Merge two block pointer types, while trying to preserve typedef info 3350 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 3351 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 3352 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3353 if (ResultType.isNull()) return QualType(); 3354 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3355 return LHS; 3356 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3357 return RHS; 3358 return getBlockPointerType(ResultType); 3359 } 3360 case Type::ConstantArray: 3361 { 3362 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3363 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3364 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3365 return QualType(); 3366 3367 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3368 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3369 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3370 if (ResultType.isNull()) return QualType(); 3371 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3372 return LHS; 3373 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3374 return RHS; 3375 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3376 ArrayType::ArraySizeModifier(), 0); 3377 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3378 ArrayType::ArraySizeModifier(), 0); 3379 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3380 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3381 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3382 return LHS; 3383 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3384 return RHS; 3385 if (LVAT) { 3386 // FIXME: This isn't correct! But tricky to implement because 3387 // the array's size has to be the size of LHS, but the type 3388 // has to be different. 3389 return LHS; 3390 } 3391 if (RVAT) { 3392 // FIXME: This isn't correct! But tricky to implement because 3393 // the array's size has to be the size of RHS, but the type 3394 // has to be different. 3395 return RHS; 3396 } 3397 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3398 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3399 return getIncompleteArrayType(ResultType, 3400 ArrayType::ArraySizeModifier(), 0); 3401 } 3402 case Type::FunctionNoProto: 3403 return mergeFunctionTypes(LHS, RHS); 3404 case Type::Record: 3405 case Type::Enum: 3406 return QualType(); 3407 case Type::Builtin: 3408 // Only exactly equal builtin types are compatible, which is tested above. 3409 return QualType(); 3410 case Type::Complex: 3411 // Distinct complex types are incompatible. 3412 return QualType(); 3413 case Type::Vector: 3414 // FIXME: The merged type should be an ExtVector! 3415 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3416 return LHS; 3417 return QualType(); 3418 case Type::ObjCInterface: { 3419 // Check if the interfaces are assignment compatible. 3420 // FIXME: This should be type compatibility, e.g. whether 3421 // "LHS x; RHS x;" at global scope is legal. 3422 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3423 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3424 if (LHSIface && RHSIface && 3425 canAssignObjCInterfaces(LHSIface, RHSIface)) 3426 return LHS; 3427 3428 return QualType(); 3429 } 3430 case Type::ObjCObjectPointer: { 3431 // FIXME: Incorporate tests from Sema::ObjCQualifiedIdTypesAreCompatible(). 3432 if (LHS->isObjCQualifiedIdType() && RHS->isObjCQualifiedIdType()) 3433 return QualType(); 3434 3435 if (canAssignObjCInterfaces(LHS->getAsObjCObjectPointerType(), 3436 RHS->getAsObjCObjectPointerType())) 3437 return LHS; 3438 3439 return QualType(); 3440 } 3441 case Type::FixedWidthInt: 3442 // Distinct fixed-width integers are not compatible. 3443 return QualType(); 3444 case Type::ExtQual: 3445 // FIXME: ExtQual types can be compatible even if they're not 3446 // identical! 3447 return QualType(); 3448 // First attempt at an implementation, but I'm not really sure it's 3449 // right... 3450#if 0 3451 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3452 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3453 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3454 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3455 return QualType(); 3456 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3457 LHSBase = QualType(LQual->getBaseType(), 0); 3458 RHSBase = QualType(RQual->getBaseType(), 0); 3459 ResultType = mergeTypes(LHSBase, RHSBase); 3460 if (ResultType.isNull()) return QualType(); 3461 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3462 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3463 return LHS; 3464 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3465 return RHS; 3466 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3467 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3468 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3469 return ResultType; 3470#endif 3471 3472 case Type::TemplateSpecialization: 3473 assert(false && "Dependent types have no size"); 3474 break; 3475 } 3476 3477 return QualType(); 3478} 3479 3480//===----------------------------------------------------------------------===// 3481// Integer Predicates 3482//===----------------------------------------------------------------------===// 3483 3484unsigned ASTContext::getIntWidth(QualType T) { 3485 if (T == BoolTy) 3486 return 1; 3487 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3488 return FWIT->getWidth(); 3489 } 3490 // For builtin types, just use the standard type sizing method 3491 return (unsigned)getTypeSize(T); 3492} 3493 3494QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3495 assert(T->isSignedIntegerType() && "Unexpected type"); 3496 if (const EnumType* ETy = T->getAsEnumType()) 3497 T = ETy->getDecl()->getIntegerType(); 3498 const BuiltinType* BTy = T->getAsBuiltinType(); 3499 assert (BTy && "Unexpected signed integer type"); 3500 switch (BTy->getKind()) { 3501 case BuiltinType::Char_S: 3502 case BuiltinType::SChar: 3503 return UnsignedCharTy; 3504 case BuiltinType::Short: 3505 return UnsignedShortTy; 3506 case BuiltinType::Int: 3507 return UnsignedIntTy; 3508 case BuiltinType::Long: 3509 return UnsignedLongTy; 3510 case BuiltinType::LongLong: 3511 return UnsignedLongLongTy; 3512 case BuiltinType::Int128: 3513 return UnsignedInt128Ty; 3514 default: 3515 assert(0 && "Unexpected signed integer type"); 3516 return QualType(); 3517 } 3518} 3519 3520ExternalASTSource::~ExternalASTSource() { } 3521 3522void ExternalASTSource::PrintStats() { } 3523 3524 3525//===----------------------------------------------------------------------===// 3526// Builtin Type Computation 3527//===----------------------------------------------------------------------===// 3528 3529/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3530/// pointer over the consumed characters. This returns the resultant type. 3531static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3532 ASTContext::GetBuiltinTypeError &Error, 3533 bool AllowTypeModifiers = true) { 3534 // Modifiers. 3535 int HowLong = 0; 3536 bool Signed = false, Unsigned = false; 3537 3538 // Read the modifiers first. 3539 bool Done = false; 3540 while (!Done) { 3541 switch (*Str++) { 3542 default: Done = true; --Str; break; 3543 case 'S': 3544 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3545 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3546 Signed = true; 3547 break; 3548 case 'U': 3549 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 3550 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 3551 Unsigned = true; 3552 break; 3553 case 'L': 3554 assert(HowLong <= 2 && "Can't have LLLL modifier"); 3555 ++HowLong; 3556 break; 3557 } 3558 } 3559 3560 QualType Type; 3561 3562 // Read the base type. 3563 switch (*Str++) { 3564 default: assert(0 && "Unknown builtin type letter!"); 3565 case 'v': 3566 assert(HowLong == 0 && !Signed && !Unsigned && 3567 "Bad modifiers used with 'v'!"); 3568 Type = Context.VoidTy; 3569 break; 3570 case 'f': 3571 assert(HowLong == 0 && !Signed && !Unsigned && 3572 "Bad modifiers used with 'f'!"); 3573 Type = Context.FloatTy; 3574 break; 3575 case 'd': 3576 assert(HowLong < 2 && !Signed && !Unsigned && 3577 "Bad modifiers used with 'd'!"); 3578 if (HowLong) 3579 Type = Context.LongDoubleTy; 3580 else 3581 Type = Context.DoubleTy; 3582 break; 3583 case 's': 3584 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 3585 if (Unsigned) 3586 Type = Context.UnsignedShortTy; 3587 else 3588 Type = Context.ShortTy; 3589 break; 3590 case 'i': 3591 if (HowLong == 3) 3592 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 3593 else if (HowLong == 2) 3594 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 3595 else if (HowLong == 1) 3596 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 3597 else 3598 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 3599 break; 3600 case 'c': 3601 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 3602 if (Signed) 3603 Type = Context.SignedCharTy; 3604 else if (Unsigned) 3605 Type = Context.UnsignedCharTy; 3606 else 3607 Type = Context.CharTy; 3608 break; 3609 case 'b': // boolean 3610 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 3611 Type = Context.BoolTy; 3612 break; 3613 case 'z': // size_t. 3614 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 3615 Type = Context.getSizeType(); 3616 break; 3617 case 'F': 3618 Type = Context.getCFConstantStringType(); 3619 break; 3620 case 'a': 3621 Type = Context.getBuiltinVaListType(); 3622 assert(!Type.isNull() && "builtin va list type not initialized!"); 3623 break; 3624 case 'A': 3625 // This is a "reference" to a va_list; however, what exactly 3626 // this means depends on how va_list is defined. There are two 3627 // different kinds of va_list: ones passed by value, and ones 3628 // passed by reference. An example of a by-value va_list is 3629 // x86, where va_list is a char*. An example of by-ref va_list 3630 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 3631 // we want this argument to be a char*&; for x86-64, we want 3632 // it to be a __va_list_tag*. 3633 Type = Context.getBuiltinVaListType(); 3634 assert(!Type.isNull() && "builtin va list type not initialized!"); 3635 if (Type->isArrayType()) { 3636 Type = Context.getArrayDecayedType(Type); 3637 } else { 3638 Type = Context.getLValueReferenceType(Type); 3639 } 3640 break; 3641 case 'V': { 3642 char *End; 3643 3644 unsigned NumElements = strtoul(Str, &End, 10); 3645 assert(End != Str && "Missing vector size"); 3646 3647 Str = End; 3648 3649 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 3650 Type = Context.getVectorType(ElementType, NumElements); 3651 break; 3652 } 3653 case 'P': { 3654 Type = Context.getFILEType(); 3655 if (Type.isNull()) { 3656 Error = ASTContext::GE_Missing_FILE; 3657 return QualType(); 3658 } else { 3659 break; 3660 } 3661 } 3662 } 3663 3664 if (!AllowTypeModifiers) 3665 return Type; 3666 3667 Done = false; 3668 while (!Done) { 3669 switch (*Str++) { 3670 default: Done = true; --Str; break; 3671 case '*': 3672 Type = Context.getPointerType(Type); 3673 break; 3674 case '&': 3675 Type = Context.getLValueReferenceType(Type); 3676 break; 3677 // FIXME: There's no way to have a built-in with an rvalue ref arg. 3678 case 'C': 3679 Type = Type.getQualifiedType(QualType::Const); 3680 break; 3681 } 3682 } 3683 3684 return Type; 3685} 3686 3687/// GetBuiltinType - Return the type for the specified builtin. 3688QualType ASTContext::GetBuiltinType(unsigned id, 3689 GetBuiltinTypeError &Error) { 3690 const char *TypeStr = BuiltinInfo.GetTypeString(id); 3691 3692 llvm::SmallVector<QualType, 8> ArgTypes; 3693 3694 Error = GE_None; 3695 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 3696 if (Error != GE_None) 3697 return QualType(); 3698 while (TypeStr[0] && TypeStr[0] != '.') { 3699 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 3700 if (Error != GE_None) 3701 return QualType(); 3702 3703 // Do array -> pointer decay. The builtin should use the decayed type. 3704 if (Ty->isArrayType()) 3705 Ty = getArrayDecayedType(Ty); 3706 3707 ArgTypes.push_back(Ty); 3708 } 3709 3710 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 3711 "'.' should only occur at end of builtin type list!"); 3712 3713 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 3714 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 3715 return getFunctionNoProtoType(ResType); 3716 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 3717 TypeStr[0] == '.', 0); 3718} 3719