ASTContext.cpp revision e23fa2d0e84d1b878e012442a726c664216a9adf
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/TypeLoc.h" 19#include "clang/AST/Expr.h" 20#include "clang/AST/ExternalASTSource.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/Basic/Builtins.h" 23#include "clang/Basic/SourceManager.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/ADT/SmallString.h" 26#include "llvm/ADT/StringExtras.h" 27#include "llvm/Support/MathExtras.h" 28#include "llvm/Support/raw_ostream.h" 29#include "RecordLayoutBuilder.h" 30 31using namespace clang; 32 33enum FloatingRank { 34 FloatRank, DoubleRank, LongDoubleRank 35}; 36 37ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 38 TargetInfo &t, 39 IdentifierTable &idents, SelectorTable &sels, 40 Builtin::Context &builtins, 41 bool FreeMem, unsigned size_reserve) : 42 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 43 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 44 sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0), 45 SourceMgr(SM), LangOpts(LOpts), 46 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 47 Idents(idents), Selectors(sels), 48 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 49 ObjCIdRedefinitionType = QualType(); 50 ObjCClassRedefinitionType = QualType(); 51 if (size_reserve > 0) Types.reserve(size_reserve); 52 TUDecl = TranslationUnitDecl::Create(*this); 53 InitBuiltinTypes(); 54} 55 56ASTContext::~ASTContext() { 57 // Deallocate all the types. 58 while (!Types.empty()) { 59 Types.back()->Destroy(*this); 60 Types.pop_back(); 61 } 62 63 { 64 llvm::FoldingSet<ExtQuals>::iterator 65 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); 66 while (I != E) 67 Deallocate(&*I++); 68 } 69 70 { 71 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 72 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 73 while (I != E) { 74 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 75 delete R; 76 } 77 } 78 79 { 80 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 81 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 82 while (I != E) { 83 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 84 delete R; 85 } 86 } 87 88 // Destroy nested-name-specifiers. 89 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 90 NNS = NestedNameSpecifiers.begin(), 91 NNSEnd = NestedNameSpecifiers.end(); 92 NNS != NNSEnd; 93 /* Increment in loop */) 94 (*NNS++).Destroy(*this); 95 96 if (GlobalNestedNameSpecifier) 97 GlobalNestedNameSpecifier->Destroy(*this); 98 99 TUDecl->Destroy(*this); 100} 101 102void 103ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 104 ExternalSource.reset(Source.take()); 105} 106 107void ASTContext::PrintStats() const { 108 fprintf(stderr, "*** AST Context Stats:\n"); 109 fprintf(stderr, " %d types total.\n", (int)Types.size()); 110 111 unsigned counts[] = { 112#define TYPE(Name, Parent) 0, 113#define ABSTRACT_TYPE(Name, Parent) 114#include "clang/AST/TypeNodes.def" 115 0 // Extra 116 }; 117 118 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 119 Type *T = Types[i]; 120 counts[(unsigned)T->getTypeClass()]++; 121 } 122 123 unsigned Idx = 0; 124 unsigned TotalBytes = 0; 125#define TYPE(Name, Parent) \ 126 if (counts[Idx]) \ 127 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 128 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 129 ++Idx; 130#define ABSTRACT_TYPE(Name, Parent) 131#include "clang/AST/TypeNodes.def" 132 133 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 134 135 if (ExternalSource.get()) { 136 fprintf(stderr, "\n"); 137 ExternalSource->PrintStats(); 138 } 139} 140 141 142void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 143 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 144 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 145 Types.push_back(Ty); 146} 147 148void ASTContext::InitBuiltinTypes() { 149 assert(VoidTy.isNull() && "Context reinitialized?"); 150 151 // C99 6.2.5p19. 152 InitBuiltinType(VoidTy, BuiltinType::Void); 153 154 // C99 6.2.5p2. 155 InitBuiltinType(BoolTy, BuiltinType::Bool); 156 // C99 6.2.5p3. 157 if (LangOpts.CharIsSigned) 158 InitBuiltinType(CharTy, BuiltinType::Char_S); 159 else 160 InitBuiltinType(CharTy, BuiltinType::Char_U); 161 // C99 6.2.5p4. 162 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 163 InitBuiltinType(ShortTy, BuiltinType::Short); 164 InitBuiltinType(IntTy, BuiltinType::Int); 165 InitBuiltinType(LongTy, BuiltinType::Long); 166 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 167 168 // C99 6.2.5p6. 169 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 170 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 171 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 172 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 173 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 174 175 // C99 6.2.5p10. 176 InitBuiltinType(FloatTy, BuiltinType::Float); 177 InitBuiltinType(DoubleTy, BuiltinType::Double); 178 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 179 180 // GNU extension, 128-bit integers. 181 InitBuiltinType(Int128Ty, BuiltinType::Int128); 182 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 183 184 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 185 InitBuiltinType(WCharTy, BuiltinType::WChar); 186 else // C99 187 WCharTy = getFromTargetType(Target.getWCharType()); 188 189 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 190 InitBuiltinType(Char16Ty, BuiltinType::Char16); 191 else // C99 192 Char16Ty = getFromTargetType(Target.getChar16Type()); 193 194 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 195 InitBuiltinType(Char32Ty, BuiltinType::Char32); 196 else // C99 197 Char32Ty = getFromTargetType(Target.getChar32Type()); 198 199 // Placeholder type for functions. 200 InitBuiltinType(OverloadTy, BuiltinType::Overload); 201 202 // Placeholder type for type-dependent expressions whose type is 203 // completely unknown. No code should ever check a type against 204 // DependentTy and users should never see it; however, it is here to 205 // help diagnose failures to properly check for type-dependent 206 // expressions. 207 InitBuiltinType(DependentTy, BuiltinType::Dependent); 208 209 // Placeholder type for C++0x auto declarations whose real type has 210 // not yet been deduced. 211 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 212 213 // C99 6.2.5p11. 214 FloatComplexTy = getComplexType(FloatTy); 215 DoubleComplexTy = getComplexType(DoubleTy); 216 LongDoubleComplexTy = getComplexType(LongDoubleTy); 217 218 BuiltinVaListType = QualType(); 219 220 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 221 ObjCIdTypedefType = QualType(); 222 ObjCClassTypedefType = QualType(); 223 224 // Builtin types for 'id' and 'Class'. 225 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 226 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 227 228 ObjCConstantStringType = QualType(); 229 230 // void * type 231 VoidPtrTy = getPointerType(VoidTy); 232 233 // nullptr type (C++0x 2.14.7) 234 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 235} 236 237MemberSpecializationInfo * 238ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 239 assert(Var->isStaticDataMember() && "Not a static data member"); 240 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 241 = InstantiatedFromStaticDataMember.find(Var); 242 if (Pos == InstantiatedFromStaticDataMember.end()) 243 return 0; 244 245 return Pos->second; 246} 247 248void 249ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 250 TemplateSpecializationKind TSK) { 251 assert(Inst->isStaticDataMember() && "Not a static data member"); 252 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 253 assert(!InstantiatedFromStaticDataMember[Inst] && 254 "Already noted what static data member was instantiated from"); 255 InstantiatedFromStaticDataMember[Inst] 256 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 257} 258 259UnresolvedUsingDecl * 260ASTContext::getInstantiatedFromUnresolvedUsingDecl(UsingDecl *UUD) { 261 llvm::DenseMap<UsingDecl *, UnresolvedUsingDecl *>::iterator Pos 262 = InstantiatedFromUnresolvedUsingDecl.find(UUD); 263 if (Pos == InstantiatedFromUnresolvedUsingDecl.end()) 264 return 0; 265 266 return Pos->second; 267} 268 269void 270ASTContext::setInstantiatedFromUnresolvedUsingDecl(UsingDecl *UD, 271 UnresolvedUsingDecl *UUD) { 272 assert(!InstantiatedFromUnresolvedUsingDecl[UD] && 273 "Already noted what using decl what instantiated from"); 274 InstantiatedFromUnresolvedUsingDecl[UD] = UUD; 275} 276 277FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 278 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 279 = InstantiatedFromUnnamedFieldDecl.find(Field); 280 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 281 return 0; 282 283 return Pos->second; 284} 285 286void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 287 FieldDecl *Tmpl) { 288 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 289 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 290 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 291 "Already noted what unnamed field was instantiated from"); 292 293 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 294} 295 296namespace { 297 class BeforeInTranslationUnit 298 : std::binary_function<SourceRange, SourceRange, bool> { 299 SourceManager *SourceMgr; 300 301 public: 302 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 303 304 bool operator()(SourceRange X, SourceRange Y) { 305 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 306 } 307 }; 308} 309 310/// \brief Determine whether the given comment is a Doxygen-style comment. 311/// 312/// \param Start the start of the comment text. 313/// 314/// \param End the end of the comment text. 315/// 316/// \param Member whether we want to check whether this is a member comment 317/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 318/// we only return true when we find a non-member comment. 319static bool 320isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 321 bool Member = false) { 322 const char *BufferStart 323 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 324 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 325 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 326 327 if (End - Start < 4) 328 return false; 329 330 assert(Start[0] == '/' && "Not a comment?"); 331 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 332 return false; 333 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 334 return false; 335 336 return (Start[3] == '<') == Member; 337} 338 339/// \brief Retrieve the comment associated with the given declaration, if 340/// it has one. 341const char *ASTContext::getCommentForDecl(const Decl *D) { 342 if (!D) 343 return 0; 344 345 // Check whether we have cached a comment string for this declaration 346 // already. 347 llvm::DenseMap<const Decl *, std::string>::iterator Pos 348 = DeclComments.find(D); 349 if (Pos != DeclComments.end()) 350 return Pos->second.c_str(); 351 352 // If we have an external AST source and have not yet loaded comments from 353 // that source, do so now. 354 if (ExternalSource && !LoadedExternalComments) { 355 std::vector<SourceRange> LoadedComments; 356 ExternalSource->ReadComments(LoadedComments); 357 358 if (!LoadedComments.empty()) 359 Comments.insert(Comments.begin(), LoadedComments.begin(), 360 LoadedComments.end()); 361 362 LoadedExternalComments = true; 363 } 364 365 // If there are no comments anywhere, we won't find anything. 366 if (Comments.empty()) 367 return 0; 368 369 // If the declaration doesn't map directly to a location in a file, we 370 // can't find the comment. 371 SourceLocation DeclStartLoc = D->getLocStart(); 372 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 373 return 0; 374 375 // Find the comment that occurs just before this declaration. 376 std::vector<SourceRange>::iterator LastComment 377 = std::lower_bound(Comments.begin(), Comments.end(), 378 SourceRange(DeclStartLoc), 379 BeforeInTranslationUnit(&SourceMgr)); 380 381 // Decompose the location for the start of the declaration and find the 382 // beginning of the file buffer. 383 std::pair<FileID, unsigned> DeclStartDecomp 384 = SourceMgr.getDecomposedLoc(DeclStartLoc); 385 const char *FileBufferStart 386 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 387 388 // First check whether we have a comment for a member. 389 if (LastComment != Comments.end() && 390 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 391 isDoxygenComment(SourceMgr, *LastComment, true)) { 392 std::pair<FileID, unsigned> LastCommentEndDecomp 393 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 394 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 395 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 396 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 397 LastCommentEndDecomp.second)) { 398 // The Doxygen member comment comes after the declaration starts and 399 // is on the same line and in the same file as the declaration. This 400 // is the comment we want. 401 std::string &Result = DeclComments[D]; 402 Result.append(FileBufferStart + 403 SourceMgr.getFileOffset(LastComment->getBegin()), 404 FileBufferStart + LastCommentEndDecomp.second + 1); 405 return Result.c_str(); 406 } 407 } 408 409 if (LastComment == Comments.begin()) 410 return 0; 411 --LastComment; 412 413 // Decompose the end of the comment. 414 std::pair<FileID, unsigned> LastCommentEndDecomp 415 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 416 417 // If the comment and the declaration aren't in the same file, then they 418 // aren't related. 419 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 420 return 0; 421 422 // Check that we actually have a Doxygen comment. 423 if (!isDoxygenComment(SourceMgr, *LastComment)) 424 return 0; 425 426 // Compute the starting line for the declaration and for the end of the 427 // comment (this is expensive). 428 unsigned DeclStartLine 429 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 430 unsigned CommentEndLine 431 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 432 LastCommentEndDecomp.second); 433 434 // If the comment does not end on the line prior to the declaration, then 435 // the comment is not associated with the declaration at all. 436 if (CommentEndLine + 1 != DeclStartLine) 437 return 0; 438 439 // We have a comment, but there may be more comments on the previous lines. 440 // Keep looking so long as the comments are still Doxygen comments and are 441 // still adjacent. 442 unsigned ExpectedLine 443 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 444 std::vector<SourceRange>::iterator FirstComment = LastComment; 445 while (FirstComment != Comments.begin()) { 446 // Look at the previous comment 447 --FirstComment; 448 std::pair<FileID, unsigned> Decomp 449 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 450 451 // If this previous comment is in a different file, we're done. 452 if (Decomp.first != DeclStartDecomp.first) { 453 ++FirstComment; 454 break; 455 } 456 457 // If this comment is not a Doxygen comment, we're done. 458 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 459 ++FirstComment; 460 break; 461 } 462 463 // If the line number is not what we expected, we're done. 464 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 465 if (Line != ExpectedLine) { 466 ++FirstComment; 467 break; 468 } 469 470 // Set the next expected line number. 471 ExpectedLine 472 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 473 } 474 475 // The iterator range [FirstComment, LastComment] contains all of the 476 // BCPL comments that, together, are associated with this declaration. 477 // Form a single comment block string for this declaration that concatenates 478 // all of these comments. 479 std::string &Result = DeclComments[D]; 480 while (FirstComment != LastComment) { 481 std::pair<FileID, unsigned> DecompStart 482 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 483 std::pair<FileID, unsigned> DecompEnd 484 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 485 Result.append(FileBufferStart + DecompStart.second, 486 FileBufferStart + DecompEnd.second + 1); 487 ++FirstComment; 488 } 489 490 // Append the last comment line. 491 Result.append(FileBufferStart + 492 SourceMgr.getFileOffset(LastComment->getBegin()), 493 FileBufferStart + LastCommentEndDecomp.second + 1); 494 return Result.c_str(); 495} 496 497//===----------------------------------------------------------------------===// 498// Type Sizing and Analysis 499//===----------------------------------------------------------------------===// 500 501/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 502/// scalar floating point type. 503const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 504 const BuiltinType *BT = T->getAs<BuiltinType>(); 505 assert(BT && "Not a floating point type!"); 506 switch (BT->getKind()) { 507 default: assert(0 && "Not a floating point type!"); 508 case BuiltinType::Float: return Target.getFloatFormat(); 509 case BuiltinType::Double: return Target.getDoubleFormat(); 510 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 511 } 512} 513 514/// getDeclAlignInBytes - Return a conservative estimate of the alignment of the 515/// specified decl. Note that bitfields do not have a valid alignment, so 516/// this method will assert on them. 517unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 518 unsigned Align = Target.getCharWidth(); 519 520 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 521 Align = std::max(Align, AA->getAlignment()); 522 523 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 524 QualType T = VD->getType(); 525 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 526 unsigned AS = RT->getPointeeType().getAddressSpace(); 527 Align = Target.getPointerAlign(AS); 528 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 529 // Incomplete or function types default to 1. 530 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 531 T = cast<ArrayType>(T)->getElementType(); 532 533 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 534 } 535 } 536 537 return Align / Target.getCharWidth(); 538} 539 540/// getTypeSize - Return the size of the specified type, in bits. This method 541/// does not work on incomplete types. 542/// 543/// FIXME: Pointers into different addr spaces could have different sizes and 544/// alignment requirements: getPointerInfo should take an AddrSpace, this 545/// should take a QualType, &c. 546std::pair<uint64_t, unsigned> 547ASTContext::getTypeInfo(const Type *T) { 548 uint64_t Width=0; 549 unsigned Align=8; 550 switch (T->getTypeClass()) { 551#define TYPE(Class, Base) 552#define ABSTRACT_TYPE(Class, Base) 553#define NON_CANONICAL_TYPE(Class, Base) 554#define DEPENDENT_TYPE(Class, Base) case Type::Class: 555#include "clang/AST/TypeNodes.def" 556 assert(false && "Should not see dependent types"); 557 break; 558 559 case Type::FunctionNoProto: 560 case Type::FunctionProto: 561 // GCC extension: alignof(function) = 32 bits 562 Width = 0; 563 Align = 32; 564 break; 565 566 case Type::IncompleteArray: 567 case Type::VariableArray: 568 Width = 0; 569 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 570 break; 571 572 case Type::ConstantArray: { 573 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 574 575 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 576 Width = EltInfo.first*CAT->getSize().getZExtValue(); 577 Align = EltInfo.second; 578 break; 579 } 580 case Type::ExtVector: 581 case Type::Vector: { 582 const VectorType *VT = cast<VectorType>(T); 583 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 584 Width = EltInfo.first*VT->getNumElements(); 585 Align = Width; 586 // If the alignment is not a power of 2, round up to the next power of 2. 587 // This happens for non-power-of-2 length vectors. 588 if (VT->getNumElements() & (VT->getNumElements()-1)) { 589 Align = llvm::NextPowerOf2(Align); 590 Width = llvm::RoundUpToAlignment(Width, Align); 591 } 592 break; 593 } 594 595 case Type::Builtin: 596 switch (cast<BuiltinType>(T)->getKind()) { 597 default: assert(0 && "Unknown builtin type!"); 598 case BuiltinType::Void: 599 // GCC extension: alignof(void) = 8 bits. 600 Width = 0; 601 Align = 8; 602 break; 603 604 case BuiltinType::Bool: 605 Width = Target.getBoolWidth(); 606 Align = Target.getBoolAlign(); 607 break; 608 case BuiltinType::Char_S: 609 case BuiltinType::Char_U: 610 case BuiltinType::UChar: 611 case BuiltinType::SChar: 612 Width = Target.getCharWidth(); 613 Align = Target.getCharAlign(); 614 break; 615 case BuiltinType::WChar: 616 Width = Target.getWCharWidth(); 617 Align = Target.getWCharAlign(); 618 break; 619 case BuiltinType::Char16: 620 Width = Target.getChar16Width(); 621 Align = Target.getChar16Align(); 622 break; 623 case BuiltinType::Char32: 624 Width = Target.getChar32Width(); 625 Align = Target.getChar32Align(); 626 break; 627 case BuiltinType::UShort: 628 case BuiltinType::Short: 629 Width = Target.getShortWidth(); 630 Align = Target.getShortAlign(); 631 break; 632 case BuiltinType::UInt: 633 case BuiltinType::Int: 634 Width = Target.getIntWidth(); 635 Align = Target.getIntAlign(); 636 break; 637 case BuiltinType::ULong: 638 case BuiltinType::Long: 639 Width = Target.getLongWidth(); 640 Align = Target.getLongAlign(); 641 break; 642 case BuiltinType::ULongLong: 643 case BuiltinType::LongLong: 644 Width = Target.getLongLongWidth(); 645 Align = Target.getLongLongAlign(); 646 break; 647 case BuiltinType::Int128: 648 case BuiltinType::UInt128: 649 Width = 128; 650 Align = 128; // int128_t is 128-bit aligned on all targets. 651 break; 652 case BuiltinType::Float: 653 Width = Target.getFloatWidth(); 654 Align = Target.getFloatAlign(); 655 break; 656 case BuiltinType::Double: 657 Width = Target.getDoubleWidth(); 658 Align = Target.getDoubleAlign(); 659 break; 660 case BuiltinType::LongDouble: 661 Width = Target.getLongDoubleWidth(); 662 Align = Target.getLongDoubleAlign(); 663 break; 664 case BuiltinType::NullPtr: 665 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 666 Align = Target.getPointerAlign(0); // == sizeof(void*) 667 break; 668 } 669 break; 670 case Type::FixedWidthInt: 671 // FIXME: This isn't precisely correct; the width/alignment should depend 672 // on the available types for the target 673 Width = cast<FixedWidthIntType>(T)->getWidth(); 674 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 675 Align = Width; 676 break; 677 case Type::ObjCObjectPointer: 678 Width = Target.getPointerWidth(0); 679 Align = Target.getPointerAlign(0); 680 break; 681 case Type::BlockPointer: { 682 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 683 Width = Target.getPointerWidth(AS); 684 Align = Target.getPointerAlign(AS); 685 break; 686 } 687 case Type::Pointer: { 688 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 689 Width = Target.getPointerWidth(AS); 690 Align = Target.getPointerAlign(AS); 691 break; 692 } 693 case Type::LValueReference: 694 case Type::RValueReference: 695 // "When applied to a reference or a reference type, the result is the size 696 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 697 // FIXME: This is wrong for struct layout: a reference in a struct has 698 // pointer size. 699 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 700 case Type::MemberPointer: { 701 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 702 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 703 // If we ever want to support other ABIs this needs to be abstracted. 704 705 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 706 std::pair<uint64_t, unsigned> PtrDiffInfo = 707 getTypeInfo(getPointerDiffType()); 708 Width = PtrDiffInfo.first; 709 if (Pointee->isFunctionType()) 710 Width *= 2; 711 Align = PtrDiffInfo.second; 712 break; 713 } 714 case Type::Complex: { 715 // Complex types have the same alignment as their elements, but twice the 716 // size. 717 std::pair<uint64_t, unsigned> EltInfo = 718 getTypeInfo(cast<ComplexType>(T)->getElementType()); 719 Width = EltInfo.first*2; 720 Align = EltInfo.second; 721 break; 722 } 723 case Type::ObjCInterface: { 724 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 725 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 726 Width = Layout.getSize(); 727 Align = Layout.getAlignment(); 728 break; 729 } 730 case Type::Record: 731 case Type::Enum: { 732 const TagType *TT = cast<TagType>(T); 733 734 if (TT->getDecl()->isInvalidDecl()) { 735 Width = 1; 736 Align = 1; 737 break; 738 } 739 740 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 741 return getTypeInfo(ET->getDecl()->getIntegerType()); 742 743 const RecordType *RT = cast<RecordType>(TT); 744 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 745 Width = Layout.getSize(); 746 Align = Layout.getAlignment(); 747 break; 748 } 749 750 case Type::SubstTemplateTypeParm: 751 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 752 getReplacementType().getTypePtr()); 753 754 case Type::Elaborated: 755 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType() 756 .getTypePtr()); 757 758 case Type::Typedef: { 759 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 760 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 761 Align = Aligned->getAlignment(); 762 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 763 } else 764 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 765 break; 766 } 767 768 case Type::TypeOfExpr: 769 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 770 .getTypePtr()); 771 772 case Type::TypeOf: 773 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 774 775 case Type::Decltype: 776 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 777 .getTypePtr()); 778 779 case Type::QualifiedName: 780 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 781 782 case Type::TemplateSpecialization: 783 assert(getCanonicalType(T) != T && 784 "Cannot request the size of a dependent type"); 785 // FIXME: this is likely to be wrong once we support template 786 // aliases, since a template alias could refer to a typedef that 787 // has an __aligned__ attribute on it. 788 return getTypeInfo(getCanonicalType(T)); 789 } 790 791 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 792 return std::make_pair(Width, Align); 793} 794 795/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 796/// type for the current target in bits. This can be different than the ABI 797/// alignment in cases where it is beneficial for performance to overalign 798/// a data type. 799unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 800 unsigned ABIAlign = getTypeAlign(T); 801 802 // Double and long long should be naturally aligned if possible. 803 if (const ComplexType* CT = T->getAs<ComplexType>()) 804 T = CT->getElementType().getTypePtr(); 805 if (T->isSpecificBuiltinType(BuiltinType::Double) || 806 T->isSpecificBuiltinType(BuiltinType::LongLong)) 807 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 808 809 return ABIAlign; 810} 811 812static void CollectLocalObjCIvars(ASTContext *Ctx, 813 const ObjCInterfaceDecl *OI, 814 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 815 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 816 E = OI->ivar_end(); I != E; ++I) { 817 ObjCIvarDecl *IVDecl = *I; 818 if (!IVDecl->isInvalidDecl()) 819 Fields.push_back(cast<FieldDecl>(IVDecl)); 820 } 821} 822 823void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 824 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 825 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 826 CollectObjCIvars(SuperClass, Fields); 827 CollectLocalObjCIvars(this, OI, Fields); 828} 829 830/// ShallowCollectObjCIvars - 831/// Collect all ivars, including those synthesized, in the current class. 832/// 833void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 834 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 835 bool CollectSynthesized) { 836 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 837 E = OI->ivar_end(); I != E; ++I) { 838 Ivars.push_back(*I); 839 } 840 if (CollectSynthesized) 841 CollectSynthesizedIvars(OI, Ivars); 842} 843 844void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 845 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 846 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 847 E = PD->prop_end(); I != E; ++I) 848 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 849 Ivars.push_back(Ivar); 850 851 // Also look into nested protocols. 852 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 853 E = PD->protocol_end(); P != E; ++P) 854 CollectProtocolSynthesizedIvars(*P, Ivars); 855} 856 857/// CollectSynthesizedIvars - 858/// This routine collect synthesized ivars for the designated class. 859/// 860void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 861 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 862 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 863 E = OI->prop_end(); I != E; ++I) { 864 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 865 Ivars.push_back(Ivar); 866 } 867 // Also look into interface's protocol list for properties declared 868 // in the protocol and whose ivars are synthesized. 869 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 870 PE = OI->protocol_end(); P != PE; ++P) { 871 ObjCProtocolDecl *PD = (*P); 872 CollectProtocolSynthesizedIvars(PD, Ivars); 873 } 874} 875 876/// CollectInheritedProtocols - Collect all protocols in current class and 877/// those inherited by it. 878void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 879 llvm::SmallVectorImpl<ObjCProtocolDecl*> &Protocols) { 880 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 881 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 882 PE = OI->protocol_end(); P != PE; ++P) { 883 ObjCProtocolDecl *Proto = (*P); 884 Protocols.push_back(Proto); 885 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 886 PE = Proto->protocol_end(); P != PE; ++P) 887 CollectInheritedProtocols(*P, Protocols); 888 } 889 890 // Categories of this Interface. 891 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 892 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 893 CollectInheritedProtocols(CDeclChain, Protocols); 894 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 895 while (SD) { 896 CollectInheritedProtocols(SD, Protocols); 897 SD = SD->getSuperClass(); 898 } 899 return; 900 } 901 if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 902 for (ObjCInterfaceDecl::protocol_iterator P = OC->protocol_begin(), 903 PE = OC->protocol_end(); P != PE; ++P) { 904 ObjCProtocolDecl *Proto = (*P); 905 Protocols.push_back(Proto); 906 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 907 PE = Proto->protocol_end(); P != PE; ++P) 908 CollectInheritedProtocols(*P, Protocols); 909 } 910 return; 911 } 912 if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 913 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 914 PE = OP->protocol_end(); P != PE; ++P) { 915 ObjCProtocolDecl *Proto = (*P); 916 Protocols.push_back(Proto); 917 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 918 PE = Proto->protocol_end(); P != PE; ++P) 919 CollectInheritedProtocols(*P, Protocols); 920 } 921 return; 922 } 923} 924 925unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 926 unsigned count = 0; 927 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 928 E = PD->prop_end(); I != E; ++I) 929 if ((*I)->getPropertyIvarDecl()) 930 ++count; 931 932 // Also look into nested protocols. 933 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 934 E = PD->protocol_end(); P != E; ++P) 935 count += CountProtocolSynthesizedIvars(*P); 936 return count; 937} 938 939unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) { 940 unsigned count = 0; 941 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 942 E = OI->prop_end(); I != E; ++I) { 943 if ((*I)->getPropertyIvarDecl()) 944 ++count; 945 } 946 // Also look into interface's protocol list for properties declared 947 // in the protocol and whose ivars are synthesized. 948 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 949 PE = OI->protocol_end(); P != PE; ++P) { 950 ObjCProtocolDecl *PD = (*P); 951 count += CountProtocolSynthesizedIvars(PD); 952 } 953 return count; 954} 955 956/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 957ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 958 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 959 I = ObjCImpls.find(D); 960 if (I != ObjCImpls.end()) 961 return cast<ObjCImplementationDecl>(I->second); 962 return 0; 963} 964/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 965ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 966 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 967 I = ObjCImpls.find(D); 968 if (I != ObjCImpls.end()) 969 return cast<ObjCCategoryImplDecl>(I->second); 970 return 0; 971} 972 973/// \brief Set the implementation of ObjCInterfaceDecl. 974void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 975 ObjCImplementationDecl *ImplD) { 976 assert(IFaceD && ImplD && "Passed null params"); 977 ObjCImpls[IFaceD] = ImplD; 978} 979/// \brief Set the implementation of ObjCCategoryDecl. 980void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 981 ObjCCategoryImplDecl *ImplD) { 982 assert(CatD && ImplD && "Passed null params"); 983 ObjCImpls[CatD] = ImplD; 984} 985 986/// \brief Allocate an uninitialized DeclaratorInfo. 987/// 988/// The caller should initialize the memory held by DeclaratorInfo using 989/// the TypeLoc wrappers. 990/// 991/// \param T the type that will be the basis for type source info. This type 992/// should refer to how the declarator was written in source code, not to 993/// what type semantic analysis resolved the declarator to. 994DeclaratorInfo *ASTContext::CreateDeclaratorInfo(QualType T, 995 unsigned DataSize) { 996 if (!DataSize) 997 DataSize = TypeLoc::getFullDataSizeForType(T); 998 else 999 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 1000 "incorrect data size provided to CreateDeclaratorInfo!"); 1001 1002 DeclaratorInfo *DInfo = 1003 (DeclaratorInfo*)BumpAlloc.Allocate(sizeof(DeclaratorInfo) + DataSize, 8); 1004 new (DInfo) DeclaratorInfo(T); 1005 return DInfo; 1006} 1007 1008DeclaratorInfo *ASTContext::getTrivialDeclaratorInfo(QualType T, 1009 SourceLocation L) { 1010 DeclaratorInfo *DI = CreateDeclaratorInfo(T); 1011 DI->getTypeLoc().initialize(L); 1012 return DI; 1013} 1014 1015/// getInterfaceLayoutImpl - Get or compute information about the 1016/// layout of the given interface. 1017/// 1018/// \param Impl - If given, also include the layout of the interface's 1019/// implementation. This may differ by including synthesized ivars. 1020const ASTRecordLayout & 1021ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 1022 const ObjCImplementationDecl *Impl) { 1023 assert(!D->isForwardDecl() && "Invalid interface decl!"); 1024 1025 // Look up this layout, if already laid out, return what we have. 1026 ObjCContainerDecl *Key = 1027 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 1028 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 1029 return *Entry; 1030 1031 // Add in synthesized ivar count if laying out an implementation. 1032 if (Impl) { 1033 unsigned FieldCount = D->ivar_size(); 1034 unsigned SynthCount = CountSynthesizedIvars(D); 1035 FieldCount += SynthCount; 1036 // If there aren't any sythesized ivars then reuse the interface 1037 // entry. Note we can't cache this because we simply free all 1038 // entries later; however we shouldn't look up implementations 1039 // frequently. 1040 if (SynthCount == 0) 1041 return getObjCLayout(D, 0); 1042 } 1043 1044 const ASTRecordLayout *NewEntry = 1045 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 1046 ObjCLayouts[Key] = NewEntry; 1047 1048 return *NewEntry; 1049} 1050 1051const ASTRecordLayout & 1052ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 1053 return getObjCLayout(D, 0); 1054} 1055 1056const ASTRecordLayout & 1057ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 1058 return getObjCLayout(D->getClassInterface(), D); 1059} 1060 1061/// getASTRecordLayout - Get or compute information about the layout of the 1062/// specified record (struct/union/class), which indicates its size and field 1063/// position information. 1064const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 1065 D = D->getDefinition(*this); 1066 assert(D && "Cannot get layout of forward declarations!"); 1067 1068 // Look up this layout, if already laid out, return what we have. 1069 // Note that we can't save a reference to the entry because this function 1070 // is recursive. 1071 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 1072 if (Entry) return *Entry; 1073 1074 const ASTRecordLayout *NewEntry = 1075 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 1076 ASTRecordLayouts[D] = NewEntry; 1077 1078 return *NewEntry; 1079} 1080 1081//===----------------------------------------------------------------------===// 1082// Type creation/memoization methods 1083//===----------------------------------------------------------------------===// 1084 1085QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1086 unsigned Fast = Quals.getFastQualifiers(); 1087 Quals.removeFastQualifiers(); 1088 1089 // Check if we've already instantiated this type. 1090 llvm::FoldingSetNodeID ID; 1091 ExtQuals::Profile(ID, TypeNode, Quals); 1092 void *InsertPos = 0; 1093 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1094 assert(EQ->getQualifiers() == Quals); 1095 QualType T = QualType(EQ, Fast); 1096 return T; 1097 } 1098 1099 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1100 ExtQualNodes.InsertNode(New, InsertPos); 1101 QualType T = QualType(New, Fast); 1102 return T; 1103} 1104 1105QualType ASTContext::getVolatileType(QualType T) { 1106 QualType CanT = getCanonicalType(T); 1107 if (CanT.isVolatileQualified()) return T; 1108 1109 QualifierCollector Quals; 1110 const Type *TypeNode = Quals.strip(T); 1111 Quals.addVolatile(); 1112 1113 return getExtQualType(TypeNode, Quals); 1114} 1115 1116QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1117 QualType CanT = getCanonicalType(T); 1118 if (CanT.getAddressSpace() == AddressSpace) 1119 return T; 1120 1121 // If we are composing extended qualifiers together, merge together 1122 // into one ExtQuals node. 1123 QualifierCollector Quals; 1124 const Type *TypeNode = Quals.strip(T); 1125 1126 // If this type already has an address space specified, it cannot get 1127 // another one. 1128 assert(!Quals.hasAddressSpace() && 1129 "Type cannot be in multiple addr spaces!"); 1130 Quals.addAddressSpace(AddressSpace); 1131 1132 return getExtQualType(TypeNode, Quals); 1133} 1134 1135QualType ASTContext::getObjCGCQualType(QualType T, 1136 Qualifiers::GC GCAttr) { 1137 QualType CanT = getCanonicalType(T); 1138 if (CanT.getObjCGCAttr() == GCAttr) 1139 return T; 1140 1141 if (T->isPointerType()) { 1142 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1143 if (Pointee->isAnyPointerType()) { 1144 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1145 return getPointerType(ResultType); 1146 } 1147 } 1148 1149 // If we are composing extended qualifiers together, merge together 1150 // into one ExtQuals node. 1151 QualifierCollector Quals; 1152 const Type *TypeNode = Quals.strip(T); 1153 1154 // If this type already has an ObjCGC specified, it cannot get 1155 // another one. 1156 assert(!Quals.hasObjCGCAttr() && 1157 "Type cannot have multiple ObjCGCs!"); 1158 Quals.addObjCGCAttr(GCAttr); 1159 1160 return getExtQualType(TypeNode, Quals); 1161} 1162 1163QualType ASTContext::getNoReturnType(QualType T) { 1164 QualType ResultType; 1165 if (T->isPointerType()) { 1166 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1167 ResultType = getNoReturnType(Pointee); 1168 ResultType = getPointerType(ResultType); 1169 } else if (T->isBlockPointerType()) { 1170 QualType Pointee = T->getAs<BlockPointerType>()->getPointeeType(); 1171 ResultType = getNoReturnType(Pointee); 1172 ResultType = getBlockPointerType(ResultType); 1173 } else { 1174 assert (T->isFunctionType() 1175 && "can't noreturn qualify non-pointer to function or block type"); 1176 1177 if (const FunctionNoProtoType *FNPT = T->getAs<FunctionNoProtoType>()) { 1178 ResultType = getFunctionNoProtoType(FNPT->getResultType(), true); 1179 } else { 1180 const FunctionProtoType *F = T->getAs<FunctionProtoType>(); 1181 ResultType 1182 = getFunctionType(F->getResultType(), F->arg_type_begin(), 1183 F->getNumArgs(), F->isVariadic(), F->getTypeQuals(), 1184 F->hasExceptionSpec(), F->hasAnyExceptionSpec(), 1185 F->getNumExceptions(), F->exception_begin(), true); 1186 } 1187 } 1188 1189 return getQualifiedType(ResultType, T.getQualifiers()); 1190} 1191 1192/// getComplexType - Return the uniqued reference to the type for a complex 1193/// number with the specified element type. 1194QualType ASTContext::getComplexType(QualType T) { 1195 // Unique pointers, to guarantee there is only one pointer of a particular 1196 // structure. 1197 llvm::FoldingSetNodeID ID; 1198 ComplexType::Profile(ID, T); 1199 1200 void *InsertPos = 0; 1201 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1202 return QualType(CT, 0); 1203 1204 // If the pointee type isn't canonical, this won't be a canonical type either, 1205 // so fill in the canonical type field. 1206 QualType Canonical; 1207 if (!T.isCanonical()) { 1208 Canonical = getComplexType(getCanonicalType(T)); 1209 1210 // Get the new insert position for the node we care about. 1211 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1212 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1213 } 1214 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1215 Types.push_back(New); 1216 ComplexTypes.InsertNode(New, InsertPos); 1217 return QualType(New, 0); 1218} 1219 1220QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1221 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1222 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1223 FixedWidthIntType *&Entry = Map[Width]; 1224 if (!Entry) 1225 Entry = new FixedWidthIntType(Width, Signed); 1226 return QualType(Entry, 0); 1227} 1228 1229/// getPointerType - Return the uniqued reference to the type for a pointer to 1230/// the specified type. 1231QualType ASTContext::getPointerType(QualType T) { 1232 // Unique pointers, to guarantee there is only one pointer of a particular 1233 // structure. 1234 llvm::FoldingSetNodeID ID; 1235 PointerType::Profile(ID, T); 1236 1237 void *InsertPos = 0; 1238 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1239 return QualType(PT, 0); 1240 1241 // If the pointee type isn't canonical, this won't be a canonical type either, 1242 // so fill in the canonical type field. 1243 QualType Canonical; 1244 if (!T.isCanonical()) { 1245 Canonical = getPointerType(getCanonicalType(T)); 1246 1247 // Get the new insert position for the node we care about. 1248 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1249 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1250 } 1251 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1252 Types.push_back(New); 1253 PointerTypes.InsertNode(New, InsertPos); 1254 return QualType(New, 0); 1255} 1256 1257/// getBlockPointerType - Return the uniqued reference to the type for 1258/// a pointer to the specified block. 1259QualType ASTContext::getBlockPointerType(QualType T) { 1260 assert(T->isFunctionType() && "block of function types only"); 1261 // Unique pointers, to guarantee there is only one block of a particular 1262 // structure. 1263 llvm::FoldingSetNodeID ID; 1264 BlockPointerType::Profile(ID, T); 1265 1266 void *InsertPos = 0; 1267 if (BlockPointerType *PT = 1268 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1269 return QualType(PT, 0); 1270 1271 // If the block pointee type isn't canonical, this won't be a canonical 1272 // type either so fill in the canonical type field. 1273 QualType Canonical; 1274 if (!T.isCanonical()) { 1275 Canonical = getBlockPointerType(getCanonicalType(T)); 1276 1277 // Get the new insert position for the node we care about. 1278 BlockPointerType *NewIP = 1279 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1280 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1281 } 1282 BlockPointerType *New 1283 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1284 Types.push_back(New); 1285 BlockPointerTypes.InsertNode(New, InsertPos); 1286 return QualType(New, 0); 1287} 1288 1289/// getLValueReferenceType - Return the uniqued reference to the type for an 1290/// lvalue reference to the specified type. 1291QualType ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) { 1292 // Unique pointers, to guarantee there is only one pointer of a particular 1293 // structure. 1294 llvm::FoldingSetNodeID ID; 1295 ReferenceType::Profile(ID, T, SpelledAsLValue); 1296 1297 void *InsertPos = 0; 1298 if (LValueReferenceType *RT = 1299 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1300 return QualType(RT, 0); 1301 1302 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1303 1304 // If the referencee type isn't canonical, this won't be a canonical type 1305 // either, so fill in the canonical type field. 1306 QualType Canonical; 1307 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1308 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1309 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1310 1311 // Get the new insert position for the node we care about. 1312 LValueReferenceType *NewIP = 1313 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1314 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1315 } 1316 1317 LValueReferenceType *New 1318 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1319 SpelledAsLValue); 1320 Types.push_back(New); 1321 LValueReferenceTypes.InsertNode(New, InsertPos); 1322 1323 return QualType(New, 0); 1324} 1325 1326/// getRValueReferenceType - Return the uniqued reference to the type for an 1327/// rvalue reference to the specified type. 1328QualType ASTContext::getRValueReferenceType(QualType T) { 1329 // Unique pointers, to guarantee there is only one pointer of a particular 1330 // structure. 1331 llvm::FoldingSetNodeID ID; 1332 ReferenceType::Profile(ID, T, false); 1333 1334 void *InsertPos = 0; 1335 if (RValueReferenceType *RT = 1336 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1337 return QualType(RT, 0); 1338 1339 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1340 1341 // If the referencee type isn't canonical, this won't be a canonical type 1342 // either, so fill in the canonical type field. 1343 QualType Canonical; 1344 if (InnerRef || !T.isCanonical()) { 1345 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1346 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1347 1348 // Get the new insert position for the node we care about. 1349 RValueReferenceType *NewIP = 1350 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1351 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1352 } 1353 1354 RValueReferenceType *New 1355 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1356 Types.push_back(New); 1357 RValueReferenceTypes.InsertNode(New, InsertPos); 1358 return QualType(New, 0); 1359} 1360 1361/// getMemberPointerType - Return the uniqued reference to the type for a 1362/// member pointer to the specified type, in the specified class. 1363QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1364 // Unique pointers, to guarantee there is only one pointer of a particular 1365 // structure. 1366 llvm::FoldingSetNodeID ID; 1367 MemberPointerType::Profile(ID, T, Cls); 1368 1369 void *InsertPos = 0; 1370 if (MemberPointerType *PT = 1371 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1372 return QualType(PT, 0); 1373 1374 // If the pointee or class type isn't canonical, this won't be a canonical 1375 // type either, so fill in the canonical type field. 1376 QualType Canonical; 1377 if (!T.isCanonical()) { 1378 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1379 1380 // Get the new insert position for the node we care about. 1381 MemberPointerType *NewIP = 1382 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1383 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1384 } 1385 MemberPointerType *New 1386 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1387 Types.push_back(New); 1388 MemberPointerTypes.InsertNode(New, InsertPos); 1389 return QualType(New, 0); 1390} 1391 1392/// getConstantArrayType - Return the unique reference to the type for an 1393/// array of the specified element type. 1394QualType ASTContext::getConstantArrayType(QualType EltTy, 1395 const llvm::APInt &ArySizeIn, 1396 ArrayType::ArraySizeModifier ASM, 1397 unsigned EltTypeQuals) { 1398 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1399 "Constant array of VLAs is illegal!"); 1400 1401 // Convert the array size into a canonical width matching the pointer size for 1402 // the target. 1403 llvm::APInt ArySize(ArySizeIn); 1404 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1405 1406 llvm::FoldingSetNodeID ID; 1407 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1408 1409 void *InsertPos = 0; 1410 if (ConstantArrayType *ATP = 1411 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1412 return QualType(ATP, 0); 1413 1414 // If the element type isn't canonical, this won't be a canonical type either, 1415 // so fill in the canonical type field. 1416 QualType Canonical; 1417 if (!EltTy.isCanonical()) { 1418 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1419 ASM, EltTypeQuals); 1420 // Get the new insert position for the node we care about. 1421 ConstantArrayType *NewIP = 1422 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1423 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1424 } 1425 1426 ConstantArrayType *New = new(*this,TypeAlignment) 1427 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1428 ConstantArrayTypes.InsertNode(New, InsertPos); 1429 Types.push_back(New); 1430 return QualType(New, 0); 1431} 1432 1433/// getVariableArrayType - Returns a non-unique reference to the type for a 1434/// variable array of the specified element type. 1435QualType ASTContext::getVariableArrayType(QualType EltTy, 1436 Expr *NumElts, 1437 ArrayType::ArraySizeModifier ASM, 1438 unsigned EltTypeQuals, 1439 SourceRange Brackets) { 1440 // Since we don't unique expressions, it isn't possible to unique VLA's 1441 // that have an expression provided for their size. 1442 1443 VariableArrayType *New = new(*this, TypeAlignment) 1444 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1445 1446 VariableArrayTypes.push_back(New); 1447 Types.push_back(New); 1448 return QualType(New, 0); 1449} 1450 1451/// getDependentSizedArrayType - Returns a non-unique reference to 1452/// the type for a dependently-sized array of the specified element 1453/// type. 1454QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1455 Expr *NumElts, 1456 ArrayType::ArraySizeModifier ASM, 1457 unsigned EltTypeQuals, 1458 SourceRange Brackets) { 1459 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1460 "Size must be type- or value-dependent!"); 1461 1462 llvm::FoldingSetNodeID ID; 1463 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1464 EltTypeQuals, NumElts); 1465 1466 void *InsertPos = 0; 1467 DependentSizedArrayType *Canon 1468 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1469 DependentSizedArrayType *New; 1470 if (Canon) { 1471 // We already have a canonical version of this array type; use it as 1472 // the canonical type for a newly-built type. 1473 New = new (*this, TypeAlignment) 1474 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1475 NumElts, ASM, EltTypeQuals, Brackets); 1476 } else { 1477 QualType CanonEltTy = getCanonicalType(EltTy); 1478 if (CanonEltTy == EltTy) { 1479 New = new (*this, TypeAlignment) 1480 DependentSizedArrayType(*this, EltTy, QualType(), 1481 NumElts, ASM, EltTypeQuals, Brackets); 1482 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1483 } else { 1484 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1485 ASM, EltTypeQuals, 1486 SourceRange()); 1487 New = new (*this, TypeAlignment) 1488 DependentSizedArrayType(*this, EltTy, Canon, 1489 NumElts, ASM, EltTypeQuals, Brackets); 1490 } 1491 } 1492 1493 Types.push_back(New); 1494 return QualType(New, 0); 1495} 1496 1497QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1498 ArrayType::ArraySizeModifier ASM, 1499 unsigned EltTypeQuals) { 1500 llvm::FoldingSetNodeID ID; 1501 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1502 1503 void *InsertPos = 0; 1504 if (IncompleteArrayType *ATP = 1505 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1506 return QualType(ATP, 0); 1507 1508 // If the element type isn't canonical, this won't be a canonical type 1509 // either, so fill in the canonical type field. 1510 QualType Canonical; 1511 1512 if (!EltTy.isCanonical()) { 1513 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1514 ASM, EltTypeQuals); 1515 1516 // Get the new insert position for the node we care about. 1517 IncompleteArrayType *NewIP = 1518 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1519 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1520 } 1521 1522 IncompleteArrayType *New = new (*this, TypeAlignment) 1523 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1524 1525 IncompleteArrayTypes.InsertNode(New, InsertPos); 1526 Types.push_back(New); 1527 return QualType(New, 0); 1528} 1529 1530/// getVectorType - Return the unique reference to a vector type of 1531/// the specified element type and size. VectorType must be a built-in type. 1532QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1533 BuiltinType *baseType; 1534 1535 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1536 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1537 1538 // Check if we've already instantiated a vector of this type. 1539 llvm::FoldingSetNodeID ID; 1540 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1541 void *InsertPos = 0; 1542 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1543 return QualType(VTP, 0); 1544 1545 // If the element type isn't canonical, this won't be a canonical type either, 1546 // so fill in the canonical type field. 1547 QualType Canonical; 1548 if (!vecType.isCanonical()) { 1549 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1550 1551 // Get the new insert position for the node we care about. 1552 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1553 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1554 } 1555 VectorType *New = new (*this, TypeAlignment) 1556 VectorType(vecType, NumElts, Canonical); 1557 VectorTypes.InsertNode(New, InsertPos); 1558 Types.push_back(New); 1559 return QualType(New, 0); 1560} 1561 1562/// getExtVectorType - Return the unique reference to an extended vector type of 1563/// the specified element type and size. VectorType must be a built-in type. 1564QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1565 BuiltinType *baseType; 1566 1567 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1568 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1569 1570 // Check if we've already instantiated a vector of this type. 1571 llvm::FoldingSetNodeID ID; 1572 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1573 void *InsertPos = 0; 1574 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1575 return QualType(VTP, 0); 1576 1577 // If the element type isn't canonical, this won't be a canonical type either, 1578 // so fill in the canonical type field. 1579 QualType Canonical; 1580 if (!vecType.isCanonical()) { 1581 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1582 1583 // Get the new insert position for the node we care about. 1584 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1585 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1586 } 1587 ExtVectorType *New = new (*this, TypeAlignment) 1588 ExtVectorType(vecType, NumElts, Canonical); 1589 VectorTypes.InsertNode(New, InsertPos); 1590 Types.push_back(New); 1591 return QualType(New, 0); 1592} 1593 1594QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1595 Expr *SizeExpr, 1596 SourceLocation AttrLoc) { 1597 llvm::FoldingSetNodeID ID; 1598 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1599 SizeExpr); 1600 1601 void *InsertPos = 0; 1602 DependentSizedExtVectorType *Canon 1603 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1604 DependentSizedExtVectorType *New; 1605 if (Canon) { 1606 // We already have a canonical version of this array type; use it as 1607 // the canonical type for a newly-built type. 1608 New = new (*this, TypeAlignment) 1609 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1610 SizeExpr, AttrLoc); 1611 } else { 1612 QualType CanonVecTy = getCanonicalType(vecType); 1613 if (CanonVecTy == vecType) { 1614 New = new (*this, TypeAlignment) 1615 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1616 AttrLoc); 1617 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1618 } else { 1619 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1620 SourceLocation()); 1621 New = new (*this, TypeAlignment) 1622 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1623 } 1624 } 1625 1626 Types.push_back(New); 1627 return QualType(New, 0); 1628} 1629 1630/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1631/// 1632QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1633 // Unique functions, to guarantee there is only one function of a particular 1634 // structure. 1635 llvm::FoldingSetNodeID ID; 1636 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1637 1638 void *InsertPos = 0; 1639 if (FunctionNoProtoType *FT = 1640 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1641 return QualType(FT, 0); 1642 1643 QualType Canonical; 1644 if (!ResultTy.isCanonical()) { 1645 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1646 1647 // Get the new insert position for the node we care about. 1648 FunctionNoProtoType *NewIP = 1649 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1650 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1651 } 1652 1653 FunctionNoProtoType *New = new (*this, TypeAlignment) 1654 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1655 Types.push_back(New); 1656 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1657 return QualType(New, 0); 1658} 1659 1660/// getFunctionType - Return a normal function type with a typed argument 1661/// list. isVariadic indicates whether the argument list includes '...'. 1662QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1663 unsigned NumArgs, bool isVariadic, 1664 unsigned TypeQuals, bool hasExceptionSpec, 1665 bool hasAnyExceptionSpec, unsigned NumExs, 1666 const QualType *ExArray, bool NoReturn) { 1667 // Unique functions, to guarantee there is only one function of a particular 1668 // structure. 1669 llvm::FoldingSetNodeID ID; 1670 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1671 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1672 NumExs, ExArray, NoReturn); 1673 1674 void *InsertPos = 0; 1675 if (FunctionProtoType *FTP = 1676 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1677 return QualType(FTP, 0); 1678 1679 // Determine whether the type being created is already canonical or not. 1680 bool isCanonical = !hasExceptionSpec && ResultTy.isCanonical(); 1681 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1682 if (!ArgArray[i].isCanonicalAsParam()) 1683 isCanonical = false; 1684 1685 // If this type isn't canonical, get the canonical version of it. 1686 // The exception spec is not part of the canonical type. 1687 QualType Canonical; 1688 if (!isCanonical) { 1689 llvm::SmallVector<QualType, 16> CanonicalArgs; 1690 CanonicalArgs.reserve(NumArgs); 1691 for (unsigned i = 0; i != NumArgs; ++i) 1692 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1693 1694 Canonical = getFunctionType(getCanonicalType(ResultTy), 1695 CanonicalArgs.data(), NumArgs, 1696 isVariadic, TypeQuals, false, 1697 false, 0, 0, NoReturn); 1698 1699 // Get the new insert position for the node we care about. 1700 FunctionProtoType *NewIP = 1701 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1702 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1703 } 1704 1705 // FunctionProtoType objects are allocated with extra bytes after them 1706 // for two variable size arrays (for parameter and exception types) at the 1707 // end of them. 1708 FunctionProtoType *FTP = 1709 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1710 NumArgs*sizeof(QualType) + 1711 NumExs*sizeof(QualType), TypeAlignment); 1712 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1713 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1714 ExArray, NumExs, Canonical, NoReturn); 1715 Types.push_back(FTP); 1716 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1717 return QualType(FTP, 0); 1718} 1719 1720/// getTypeDeclType - Return the unique reference to the type for the 1721/// specified type declaration. 1722QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1723 assert(Decl && "Passed null for Decl param"); 1724 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1725 1726 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1727 return getTypedefType(Typedef); 1728 else if (isa<TemplateTypeParmDecl>(Decl)) { 1729 assert(false && "Template type parameter types are always available."); 1730 } else if (ObjCInterfaceDecl *ObjCInterface 1731 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1732 return getObjCInterfaceType(ObjCInterface); 1733 1734 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1735 if (PrevDecl) 1736 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1737 else 1738 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1739 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1740 if (PrevDecl) 1741 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1742 else 1743 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1744 } else 1745 assert(false && "TypeDecl without a type?"); 1746 1747 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1748 return QualType(Decl->TypeForDecl, 0); 1749} 1750 1751/// getTypedefType - Return the unique reference to the type for the 1752/// specified typename decl. 1753QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1754 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1755 1756 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1757 Decl->TypeForDecl = new(*this, TypeAlignment) 1758 TypedefType(Type::Typedef, Decl, Canonical); 1759 Types.push_back(Decl->TypeForDecl); 1760 return QualType(Decl->TypeForDecl, 0); 1761} 1762 1763/// \brief Retrieve a substitution-result type. 1764QualType 1765ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1766 QualType Replacement) { 1767 assert(Replacement.isCanonical() 1768 && "replacement types must always be canonical"); 1769 1770 llvm::FoldingSetNodeID ID; 1771 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1772 void *InsertPos = 0; 1773 SubstTemplateTypeParmType *SubstParm 1774 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1775 1776 if (!SubstParm) { 1777 SubstParm = new (*this, TypeAlignment) 1778 SubstTemplateTypeParmType(Parm, Replacement); 1779 Types.push_back(SubstParm); 1780 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1781 } 1782 1783 return QualType(SubstParm, 0); 1784} 1785 1786/// \brief Retrieve the template type parameter type for a template 1787/// parameter or parameter pack with the given depth, index, and (optionally) 1788/// name. 1789QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1790 bool ParameterPack, 1791 IdentifierInfo *Name) { 1792 llvm::FoldingSetNodeID ID; 1793 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1794 void *InsertPos = 0; 1795 TemplateTypeParmType *TypeParm 1796 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1797 1798 if (TypeParm) 1799 return QualType(TypeParm, 0); 1800 1801 if (Name) { 1802 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1803 TypeParm = new (*this, TypeAlignment) 1804 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1805 } else 1806 TypeParm = new (*this, TypeAlignment) 1807 TemplateTypeParmType(Depth, Index, ParameterPack); 1808 1809 Types.push_back(TypeParm); 1810 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1811 1812 return QualType(TypeParm, 0); 1813} 1814 1815QualType 1816ASTContext::getTemplateSpecializationType(TemplateName Template, 1817 const TemplateArgumentLoc *Args, 1818 unsigned NumArgs, 1819 QualType Canon) { 1820 llvm::SmallVector<TemplateArgument, 4> ArgVec; 1821 ArgVec.reserve(NumArgs); 1822 for (unsigned i = 0; i != NumArgs; ++i) 1823 ArgVec.push_back(Args[i].getArgument()); 1824 1825 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, Canon); 1826} 1827 1828QualType 1829ASTContext::getTemplateSpecializationType(TemplateName Template, 1830 const TemplateArgument *Args, 1831 unsigned NumArgs, 1832 QualType Canon) { 1833 if (!Canon.isNull()) 1834 Canon = getCanonicalType(Canon); 1835 else { 1836 // Build the canonical template specialization type. 1837 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1838 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1839 CanonArgs.reserve(NumArgs); 1840 for (unsigned I = 0; I != NumArgs; ++I) 1841 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1842 1843 // Determine whether this canonical template specialization type already 1844 // exists. 1845 llvm::FoldingSetNodeID ID; 1846 TemplateSpecializationType::Profile(ID, CanonTemplate, 1847 CanonArgs.data(), NumArgs, *this); 1848 1849 void *InsertPos = 0; 1850 TemplateSpecializationType *Spec 1851 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1852 1853 if (!Spec) { 1854 // Allocate a new canonical template specialization type. 1855 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1856 sizeof(TemplateArgument) * NumArgs), 1857 TypeAlignment); 1858 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1859 CanonArgs.data(), NumArgs, 1860 Canon); 1861 Types.push_back(Spec); 1862 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1863 } 1864 1865 if (Canon.isNull()) 1866 Canon = QualType(Spec, 0); 1867 assert(Canon->isDependentType() && 1868 "Non-dependent template-id type must have a canonical type"); 1869 } 1870 1871 // Allocate the (non-canonical) template specialization type, but don't 1872 // try to unique it: these types typically have location information that 1873 // we don't unique and don't want to lose. 1874 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1875 sizeof(TemplateArgument) * NumArgs), 1876 TypeAlignment); 1877 TemplateSpecializationType *Spec 1878 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1879 Canon); 1880 1881 Types.push_back(Spec); 1882 return QualType(Spec, 0); 1883} 1884 1885QualType 1886ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1887 QualType NamedType) { 1888 llvm::FoldingSetNodeID ID; 1889 QualifiedNameType::Profile(ID, NNS, NamedType); 1890 1891 void *InsertPos = 0; 1892 QualifiedNameType *T 1893 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1894 if (T) 1895 return QualType(T, 0); 1896 1897 T = new (*this) QualifiedNameType(NNS, NamedType, 1898 getCanonicalType(NamedType)); 1899 Types.push_back(T); 1900 QualifiedNameTypes.InsertNode(T, InsertPos); 1901 return QualType(T, 0); 1902} 1903 1904QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1905 const IdentifierInfo *Name, 1906 QualType Canon) { 1907 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1908 1909 if (Canon.isNull()) { 1910 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1911 if (CanonNNS != NNS) 1912 Canon = getTypenameType(CanonNNS, Name); 1913 } 1914 1915 llvm::FoldingSetNodeID ID; 1916 TypenameType::Profile(ID, NNS, Name); 1917 1918 void *InsertPos = 0; 1919 TypenameType *T 1920 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1921 if (T) 1922 return QualType(T, 0); 1923 1924 T = new (*this) TypenameType(NNS, Name, Canon); 1925 Types.push_back(T); 1926 TypenameTypes.InsertNode(T, InsertPos); 1927 return QualType(T, 0); 1928} 1929 1930QualType 1931ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1932 const TemplateSpecializationType *TemplateId, 1933 QualType Canon) { 1934 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1935 1936 if (Canon.isNull()) { 1937 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1938 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1939 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1940 const TemplateSpecializationType *CanonTemplateId 1941 = CanonType->getAs<TemplateSpecializationType>(); 1942 assert(CanonTemplateId && 1943 "Canonical type must also be a template specialization type"); 1944 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1945 } 1946 } 1947 1948 llvm::FoldingSetNodeID ID; 1949 TypenameType::Profile(ID, NNS, TemplateId); 1950 1951 void *InsertPos = 0; 1952 TypenameType *T 1953 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1954 if (T) 1955 return QualType(T, 0); 1956 1957 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1958 Types.push_back(T); 1959 TypenameTypes.InsertNode(T, InsertPos); 1960 return QualType(T, 0); 1961} 1962 1963QualType 1964ASTContext::getElaboratedType(QualType UnderlyingType, 1965 ElaboratedType::TagKind Tag) { 1966 llvm::FoldingSetNodeID ID; 1967 ElaboratedType::Profile(ID, UnderlyingType, Tag); 1968 1969 void *InsertPos = 0; 1970 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 1971 if (T) 1972 return QualType(T, 0); 1973 1974 QualType Canon = getCanonicalType(UnderlyingType); 1975 1976 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 1977 Types.push_back(T); 1978 ElaboratedTypes.InsertNode(T, InsertPos); 1979 return QualType(T, 0); 1980} 1981 1982/// CmpProtocolNames - Comparison predicate for sorting protocols 1983/// alphabetically. 1984static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1985 const ObjCProtocolDecl *RHS) { 1986 return LHS->getDeclName() < RHS->getDeclName(); 1987} 1988 1989static bool areSortedAndUniqued(ObjCProtocolDecl **Protocols, 1990 unsigned NumProtocols) { 1991 if (NumProtocols == 0) return true; 1992 1993 for (unsigned i = 1; i != NumProtocols; ++i) 1994 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 1995 return false; 1996 return true; 1997} 1998 1999static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2000 unsigned &NumProtocols) { 2001 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2002 2003 // Sort protocols, keyed by name. 2004 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2005 2006 // Remove duplicates. 2007 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2008 NumProtocols = ProtocolsEnd-Protocols; 2009} 2010 2011/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2012/// the given interface decl and the conforming protocol list. 2013QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 2014 ObjCProtocolDecl **Protocols, 2015 unsigned NumProtocols) { 2016 llvm::FoldingSetNodeID ID; 2017 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 2018 2019 void *InsertPos = 0; 2020 if (ObjCObjectPointerType *QT = 2021 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2022 return QualType(QT, 0); 2023 2024 // Sort the protocol list alphabetically to canonicalize it. 2025 QualType Canonical; 2026 if (!InterfaceT.isCanonical() || 2027 !areSortedAndUniqued(Protocols, NumProtocols)) { 2028 if (!areSortedAndUniqued(Protocols, NumProtocols)) { 2029 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2030 unsigned UniqueCount = NumProtocols; 2031 2032 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2033 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2034 2035 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2036 &Sorted[0], UniqueCount); 2037 } else { 2038 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2039 Protocols, NumProtocols); 2040 } 2041 2042 // Regenerate InsertPos. 2043 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2044 } 2045 2046 // No Match; 2047 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 2048 ObjCObjectPointerType(Canonical, InterfaceT, Protocols, NumProtocols); 2049 2050 Types.push_back(QType); 2051 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2052 return QualType(QType, 0); 2053} 2054 2055/// getObjCInterfaceType - Return the unique reference to the type for the 2056/// specified ObjC interface decl. The list of protocols is optional. 2057QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 2058 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 2059 llvm::FoldingSetNodeID ID; 2060 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 2061 2062 void *InsertPos = 0; 2063 if (ObjCInterfaceType *QT = 2064 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 2065 return QualType(QT, 0); 2066 2067 // Sort the protocol list alphabetically to canonicalize it. 2068 QualType Canonical; 2069 if (NumProtocols && !areSortedAndUniqued(Protocols, NumProtocols)) { 2070 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2071 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2072 2073 unsigned UniqueCount = NumProtocols; 2074 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2075 2076 Canonical = getObjCInterfaceType(Decl, &Sorted[0], UniqueCount); 2077 2078 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos); 2079 } 2080 2081 ObjCInterfaceType *QType = new (*this, TypeAlignment) 2082 ObjCInterfaceType(Canonical, const_cast<ObjCInterfaceDecl*>(Decl), 2083 Protocols, NumProtocols); 2084 2085 Types.push_back(QType); 2086 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 2087 return QualType(QType, 0); 2088} 2089 2090/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2091/// TypeOfExprType AST's (since expression's are never shared). For example, 2092/// multiple declarations that refer to "typeof(x)" all contain different 2093/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2094/// on canonical type's (which are always unique). 2095QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2096 TypeOfExprType *toe; 2097 if (tofExpr->isTypeDependent()) { 2098 llvm::FoldingSetNodeID ID; 2099 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2100 2101 void *InsertPos = 0; 2102 DependentTypeOfExprType *Canon 2103 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2104 if (Canon) { 2105 // We already have a "canonical" version of an identical, dependent 2106 // typeof(expr) type. Use that as our canonical type. 2107 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2108 QualType((TypeOfExprType*)Canon, 0)); 2109 } 2110 else { 2111 // Build a new, canonical typeof(expr) type. 2112 Canon 2113 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2114 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2115 toe = Canon; 2116 } 2117 } else { 2118 QualType Canonical = getCanonicalType(tofExpr->getType()); 2119 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2120 } 2121 Types.push_back(toe); 2122 return QualType(toe, 0); 2123} 2124 2125/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2126/// TypeOfType AST's. The only motivation to unique these nodes would be 2127/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2128/// an issue. This doesn't effect the type checker, since it operates 2129/// on canonical type's (which are always unique). 2130QualType ASTContext::getTypeOfType(QualType tofType) { 2131 QualType Canonical = getCanonicalType(tofType); 2132 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2133 Types.push_back(tot); 2134 return QualType(tot, 0); 2135} 2136 2137/// getDecltypeForExpr - Given an expr, will return the decltype for that 2138/// expression, according to the rules in C++0x [dcl.type.simple]p4 2139static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2140 if (e->isTypeDependent()) 2141 return Context.DependentTy; 2142 2143 // If e is an id expression or a class member access, decltype(e) is defined 2144 // as the type of the entity named by e. 2145 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2146 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2147 return VD->getType(); 2148 } 2149 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2150 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2151 return FD->getType(); 2152 } 2153 // If e is a function call or an invocation of an overloaded operator, 2154 // (parentheses around e are ignored), decltype(e) is defined as the 2155 // return type of that function. 2156 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2157 return CE->getCallReturnType(); 2158 2159 QualType T = e->getType(); 2160 2161 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2162 // defined as T&, otherwise decltype(e) is defined as T. 2163 if (e->isLvalue(Context) == Expr::LV_Valid) 2164 T = Context.getLValueReferenceType(T); 2165 2166 return T; 2167} 2168 2169/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2170/// DecltypeType AST's. The only motivation to unique these nodes would be 2171/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2172/// an issue. This doesn't effect the type checker, since it operates 2173/// on canonical type's (which are always unique). 2174QualType ASTContext::getDecltypeType(Expr *e) { 2175 DecltypeType *dt; 2176 if (e->isTypeDependent()) { 2177 llvm::FoldingSetNodeID ID; 2178 DependentDecltypeType::Profile(ID, *this, e); 2179 2180 void *InsertPos = 0; 2181 DependentDecltypeType *Canon 2182 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2183 if (Canon) { 2184 // We already have a "canonical" version of an equivalent, dependent 2185 // decltype type. Use that as our canonical type. 2186 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2187 QualType((DecltypeType*)Canon, 0)); 2188 } 2189 else { 2190 // Build a new, canonical typeof(expr) type. 2191 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2192 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2193 dt = Canon; 2194 } 2195 } else { 2196 QualType T = getDecltypeForExpr(e, *this); 2197 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2198 } 2199 Types.push_back(dt); 2200 return QualType(dt, 0); 2201} 2202 2203/// getTagDeclType - Return the unique reference to the type for the 2204/// specified TagDecl (struct/union/class/enum) decl. 2205QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2206 assert (Decl); 2207 // FIXME: What is the design on getTagDeclType when it requires casting 2208 // away const? mutable? 2209 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2210} 2211 2212/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2213/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2214/// needs to agree with the definition in <stddef.h>. 2215QualType ASTContext::getSizeType() const { 2216 return getFromTargetType(Target.getSizeType()); 2217} 2218 2219/// getSignedWCharType - Return the type of "signed wchar_t". 2220/// Used when in C++, as a GCC extension. 2221QualType ASTContext::getSignedWCharType() const { 2222 // FIXME: derive from "Target" ? 2223 return WCharTy; 2224} 2225 2226/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2227/// Used when in C++, as a GCC extension. 2228QualType ASTContext::getUnsignedWCharType() const { 2229 // FIXME: derive from "Target" ? 2230 return UnsignedIntTy; 2231} 2232 2233/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2234/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2235QualType ASTContext::getPointerDiffType() const { 2236 return getFromTargetType(Target.getPtrDiffType(0)); 2237} 2238 2239//===----------------------------------------------------------------------===// 2240// Type Operators 2241//===----------------------------------------------------------------------===// 2242 2243CanQualType ASTContext::getCanonicalParamType(QualType T) { 2244 // Push qualifiers into arrays, and then discard any remaining 2245 // qualifiers. 2246 T = getCanonicalType(T); 2247 const Type *Ty = T.getTypePtr(); 2248 2249 QualType Result; 2250 if (isa<ArrayType>(Ty)) { 2251 Result = getArrayDecayedType(QualType(Ty,0)); 2252 } else if (isa<FunctionType>(Ty)) { 2253 Result = getPointerType(QualType(Ty, 0)); 2254 } else { 2255 Result = QualType(Ty, 0); 2256 } 2257 2258 return CanQualType::CreateUnsafe(Result); 2259} 2260 2261/// getCanonicalType - Return the canonical (structural) type corresponding to 2262/// the specified potentially non-canonical type. The non-canonical version 2263/// of a type may have many "decorated" versions of types. Decorators can 2264/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2265/// to be free of any of these, allowing two canonical types to be compared 2266/// for exact equality with a simple pointer comparison. 2267CanQualType ASTContext::getCanonicalType(QualType T) { 2268 QualifierCollector Quals; 2269 const Type *Ptr = Quals.strip(T); 2270 QualType CanType = Ptr->getCanonicalTypeInternal(); 2271 2272 // The canonical internal type will be the canonical type *except* 2273 // that we push type qualifiers down through array types. 2274 2275 // If there are no new qualifiers to push down, stop here. 2276 if (!Quals.hasQualifiers()) 2277 return CanQualType::CreateUnsafe(CanType); 2278 2279 // If the type qualifiers are on an array type, get the canonical 2280 // type of the array with the qualifiers applied to the element 2281 // type. 2282 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2283 if (!AT) 2284 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2285 2286 // Get the canonical version of the element with the extra qualifiers on it. 2287 // This can recursively sink qualifiers through multiple levels of arrays. 2288 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2289 NewEltTy = getCanonicalType(NewEltTy); 2290 2291 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2292 return CanQualType::CreateUnsafe( 2293 getConstantArrayType(NewEltTy, CAT->getSize(), 2294 CAT->getSizeModifier(), 2295 CAT->getIndexTypeCVRQualifiers())); 2296 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2297 return CanQualType::CreateUnsafe( 2298 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2299 IAT->getIndexTypeCVRQualifiers())); 2300 2301 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2302 return CanQualType::CreateUnsafe( 2303 getDependentSizedArrayType(NewEltTy, 2304 DSAT->getSizeExpr() ? 2305 DSAT->getSizeExpr()->Retain() : 0, 2306 DSAT->getSizeModifier(), 2307 DSAT->getIndexTypeCVRQualifiers(), 2308 DSAT->getBracketsRange())); 2309 2310 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2311 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2312 VAT->getSizeExpr() ? 2313 VAT->getSizeExpr()->Retain() : 0, 2314 VAT->getSizeModifier(), 2315 VAT->getIndexTypeCVRQualifiers(), 2316 VAT->getBracketsRange())); 2317} 2318 2319TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2320 // If this template name refers to a template, the canonical 2321 // template name merely stores the template itself. 2322 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2323 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2324 2325 // If this template name refers to a set of overloaded function templates, 2326 /// the canonical template name merely stores the set of function templates. 2327 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) { 2328 OverloadedFunctionDecl *CanonOvl = 0; 2329 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 2330 FEnd = Ovl->function_end(); 2331 F != FEnd; ++F) { 2332 Decl *Canon = F->get()->getCanonicalDecl(); 2333 if (CanonOvl || Canon != F->get()) { 2334 if (!CanonOvl) 2335 CanonOvl = OverloadedFunctionDecl::Create(*this, 2336 Ovl->getDeclContext(), 2337 Ovl->getDeclName()); 2338 2339 CanonOvl->addOverload( 2340 AnyFunctionDecl::getFromNamedDecl(cast<NamedDecl>(Canon))); 2341 } 2342 } 2343 2344 return TemplateName(CanonOvl? CanonOvl : Ovl); 2345 } 2346 2347 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2348 assert(DTN && "Non-dependent template names must refer to template decls."); 2349 return DTN->CanonicalTemplateName; 2350} 2351 2352TemplateArgument 2353ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2354 switch (Arg.getKind()) { 2355 case TemplateArgument::Null: 2356 return Arg; 2357 2358 case TemplateArgument::Expression: 2359 // FIXME: Build canonical expression? 2360 return Arg; 2361 2362 case TemplateArgument::Declaration: 2363 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2364 2365 case TemplateArgument::Integral: 2366 return TemplateArgument(*Arg.getAsIntegral(), 2367 getCanonicalType(Arg.getIntegralType())); 2368 2369 case TemplateArgument::Type: 2370 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2371 2372 case TemplateArgument::Pack: { 2373 // FIXME: Allocate in ASTContext 2374 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2375 unsigned Idx = 0; 2376 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2377 AEnd = Arg.pack_end(); 2378 A != AEnd; (void)++A, ++Idx) 2379 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2380 2381 TemplateArgument Result; 2382 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2383 return Result; 2384 } 2385 } 2386 2387 // Silence GCC warning 2388 assert(false && "Unhandled template argument kind"); 2389 return TemplateArgument(); 2390} 2391 2392NestedNameSpecifier * 2393ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2394 if (!NNS) 2395 return 0; 2396 2397 switch (NNS->getKind()) { 2398 case NestedNameSpecifier::Identifier: 2399 // Canonicalize the prefix but keep the identifier the same. 2400 return NestedNameSpecifier::Create(*this, 2401 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2402 NNS->getAsIdentifier()); 2403 2404 case NestedNameSpecifier::Namespace: 2405 // A namespace is canonical; build a nested-name-specifier with 2406 // this namespace and no prefix. 2407 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2408 2409 case NestedNameSpecifier::TypeSpec: 2410 case NestedNameSpecifier::TypeSpecWithTemplate: { 2411 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2412 return NestedNameSpecifier::Create(*this, 0, 2413 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2414 T.getTypePtr()); 2415 } 2416 2417 case NestedNameSpecifier::Global: 2418 // The global specifier is canonical and unique. 2419 return NNS; 2420 } 2421 2422 // Required to silence a GCC warning 2423 return 0; 2424} 2425 2426 2427const ArrayType *ASTContext::getAsArrayType(QualType T) { 2428 // Handle the non-qualified case efficiently. 2429 if (!T.hasQualifiers()) { 2430 // Handle the common positive case fast. 2431 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2432 return AT; 2433 } 2434 2435 // Handle the common negative case fast. 2436 QualType CType = T->getCanonicalTypeInternal(); 2437 if (!isa<ArrayType>(CType)) 2438 return 0; 2439 2440 // Apply any qualifiers from the array type to the element type. This 2441 // implements C99 6.7.3p8: "If the specification of an array type includes 2442 // any type qualifiers, the element type is so qualified, not the array type." 2443 2444 // If we get here, we either have type qualifiers on the type, or we have 2445 // sugar such as a typedef in the way. If we have type qualifiers on the type 2446 // we must propagate them down into the element type. 2447 2448 QualifierCollector Qs; 2449 const Type *Ty = Qs.strip(T.getDesugaredType()); 2450 2451 // If we have a simple case, just return now. 2452 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2453 if (ATy == 0 || Qs.empty()) 2454 return ATy; 2455 2456 // Otherwise, we have an array and we have qualifiers on it. Push the 2457 // qualifiers into the array element type and return a new array type. 2458 // Get the canonical version of the element with the extra qualifiers on it. 2459 // This can recursively sink qualifiers through multiple levels of arrays. 2460 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2461 2462 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2463 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2464 CAT->getSizeModifier(), 2465 CAT->getIndexTypeCVRQualifiers())); 2466 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2467 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2468 IAT->getSizeModifier(), 2469 IAT->getIndexTypeCVRQualifiers())); 2470 2471 if (const DependentSizedArrayType *DSAT 2472 = dyn_cast<DependentSizedArrayType>(ATy)) 2473 return cast<ArrayType>( 2474 getDependentSizedArrayType(NewEltTy, 2475 DSAT->getSizeExpr() ? 2476 DSAT->getSizeExpr()->Retain() : 0, 2477 DSAT->getSizeModifier(), 2478 DSAT->getIndexTypeCVRQualifiers(), 2479 DSAT->getBracketsRange())); 2480 2481 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2482 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2483 VAT->getSizeExpr() ? 2484 VAT->getSizeExpr()->Retain() : 0, 2485 VAT->getSizeModifier(), 2486 VAT->getIndexTypeCVRQualifiers(), 2487 VAT->getBracketsRange())); 2488} 2489 2490 2491/// getArrayDecayedType - Return the properly qualified result of decaying the 2492/// specified array type to a pointer. This operation is non-trivial when 2493/// handling typedefs etc. The canonical type of "T" must be an array type, 2494/// this returns a pointer to a properly qualified element of the array. 2495/// 2496/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2497QualType ASTContext::getArrayDecayedType(QualType Ty) { 2498 // Get the element type with 'getAsArrayType' so that we don't lose any 2499 // typedefs in the element type of the array. This also handles propagation 2500 // of type qualifiers from the array type into the element type if present 2501 // (C99 6.7.3p8). 2502 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2503 assert(PrettyArrayType && "Not an array type!"); 2504 2505 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2506 2507 // int x[restrict 4] -> int *restrict 2508 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2509} 2510 2511QualType ASTContext::getBaseElementType(QualType QT) { 2512 QualifierCollector Qs; 2513 while (true) { 2514 const Type *UT = Qs.strip(QT); 2515 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2516 QT = AT->getElementType(); 2517 } else { 2518 return Qs.apply(QT); 2519 } 2520 } 2521} 2522 2523QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2524 QualType ElemTy = AT->getElementType(); 2525 2526 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2527 return getBaseElementType(AT); 2528 2529 return ElemTy; 2530} 2531 2532/// getConstantArrayElementCount - Returns number of constant array elements. 2533uint64_t 2534ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2535 uint64_t ElementCount = 1; 2536 do { 2537 ElementCount *= CA->getSize().getZExtValue(); 2538 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2539 } while (CA); 2540 return ElementCount; 2541} 2542 2543/// getFloatingRank - Return a relative rank for floating point types. 2544/// This routine will assert if passed a built-in type that isn't a float. 2545static FloatingRank getFloatingRank(QualType T) { 2546 if (const ComplexType *CT = T->getAs<ComplexType>()) 2547 return getFloatingRank(CT->getElementType()); 2548 2549 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2550 switch (T->getAs<BuiltinType>()->getKind()) { 2551 default: assert(0 && "getFloatingRank(): not a floating type"); 2552 case BuiltinType::Float: return FloatRank; 2553 case BuiltinType::Double: return DoubleRank; 2554 case BuiltinType::LongDouble: return LongDoubleRank; 2555 } 2556} 2557 2558/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2559/// point or a complex type (based on typeDomain/typeSize). 2560/// 'typeDomain' is a real floating point or complex type. 2561/// 'typeSize' is a real floating point or complex type. 2562QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2563 QualType Domain) const { 2564 FloatingRank EltRank = getFloatingRank(Size); 2565 if (Domain->isComplexType()) { 2566 switch (EltRank) { 2567 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2568 case FloatRank: return FloatComplexTy; 2569 case DoubleRank: return DoubleComplexTy; 2570 case LongDoubleRank: return LongDoubleComplexTy; 2571 } 2572 } 2573 2574 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2575 switch (EltRank) { 2576 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2577 case FloatRank: return FloatTy; 2578 case DoubleRank: return DoubleTy; 2579 case LongDoubleRank: return LongDoubleTy; 2580 } 2581} 2582 2583/// getFloatingTypeOrder - Compare the rank of the two specified floating 2584/// point types, ignoring the domain of the type (i.e. 'double' == 2585/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2586/// LHS < RHS, return -1. 2587int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2588 FloatingRank LHSR = getFloatingRank(LHS); 2589 FloatingRank RHSR = getFloatingRank(RHS); 2590 2591 if (LHSR == RHSR) 2592 return 0; 2593 if (LHSR > RHSR) 2594 return 1; 2595 return -1; 2596} 2597 2598/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2599/// routine will assert if passed a built-in type that isn't an integer or enum, 2600/// or if it is not canonicalized. 2601unsigned ASTContext::getIntegerRank(Type *T) { 2602 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 2603 if (EnumType* ET = dyn_cast<EnumType>(T)) 2604 T = ET->getDecl()->getIntegerType().getTypePtr(); 2605 2606 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2607 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2608 2609 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2610 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2611 2612 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2613 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2614 2615 // There are two things which impact the integer rank: the width, and 2616 // the ordering of builtins. The builtin ordering is encoded in the 2617 // bottom three bits; the width is encoded in the bits above that. 2618 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2619 return FWIT->getWidth() << 3; 2620 2621 switch (cast<BuiltinType>(T)->getKind()) { 2622 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2623 case BuiltinType::Bool: 2624 return 1 + (getIntWidth(BoolTy) << 3); 2625 case BuiltinType::Char_S: 2626 case BuiltinType::Char_U: 2627 case BuiltinType::SChar: 2628 case BuiltinType::UChar: 2629 return 2 + (getIntWidth(CharTy) << 3); 2630 case BuiltinType::Short: 2631 case BuiltinType::UShort: 2632 return 3 + (getIntWidth(ShortTy) << 3); 2633 case BuiltinType::Int: 2634 case BuiltinType::UInt: 2635 return 4 + (getIntWidth(IntTy) << 3); 2636 case BuiltinType::Long: 2637 case BuiltinType::ULong: 2638 return 5 + (getIntWidth(LongTy) << 3); 2639 case BuiltinType::LongLong: 2640 case BuiltinType::ULongLong: 2641 return 6 + (getIntWidth(LongLongTy) << 3); 2642 case BuiltinType::Int128: 2643 case BuiltinType::UInt128: 2644 return 7 + (getIntWidth(Int128Ty) << 3); 2645 } 2646} 2647 2648/// \brief Whether this is a promotable bitfield reference according 2649/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2650/// 2651/// \returns the type this bit-field will promote to, or NULL if no 2652/// promotion occurs. 2653QualType ASTContext::isPromotableBitField(Expr *E) { 2654 FieldDecl *Field = E->getBitField(); 2655 if (!Field) 2656 return QualType(); 2657 2658 QualType FT = Field->getType(); 2659 2660 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2661 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2662 uint64_t IntSize = getTypeSize(IntTy); 2663 // GCC extension compatibility: if the bit-field size is less than or equal 2664 // to the size of int, it gets promoted no matter what its type is. 2665 // For instance, unsigned long bf : 4 gets promoted to signed int. 2666 if (BitWidth < IntSize) 2667 return IntTy; 2668 2669 if (BitWidth == IntSize) 2670 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2671 2672 // Types bigger than int are not subject to promotions, and therefore act 2673 // like the base type. 2674 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2675 // is ridiculous. 2676 return QualType(); 2677} 2678 2679/// getPromotedIntegerType - Returns the type that Promotable will 2680/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2681/// integer type. 2682QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2683 assert(!Promotable.isNull()); 2684 assert(Promotable->isPromotableIntegerType()); 2685 if (Promotable->isSignedIntegerType()) 2686 return IntTy; 2687 uint64_t PromotableSize = getTypeSize(Promotable); 2688 uint64_t IntSize = getTypeSize(IntTy); 2689 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2690 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2691} 2692 2693/// getIntegerTypeOrder - Returns the highest ranked integer type: 2694/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2695/// LHS < RHS, return -1. 2696int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2697 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2698 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2699 if (LHSC == RHSC) return 0; 2700 2701 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2702 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2703 2704 unsigned LHSRank = getIntegerRank(LHSC); 2705 unsigned RHSRank = getIntegerRank(RHSC); 2706 2707 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2708 if (LHSRank == RHSRank) return 0; 2709 return LHSRank > RHSRank ? 1 : -1; 2710 } 2711 2712 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2713 if (LHSUnsigned) { 2714 // If the unsigned [LHS] type is larger, return it. 2715 if (LHSRank >= RHSRank) 2716 return 1; 2717 2718 // If the signed type can represent all values of the unsigned type, it 2719 // wins. Because we are dealing with 2's complement and types that are 2720 // powers of two larger than each other, this is always safe. 2721 return -1; 2722 } 2723 2724 // If the unsigned [RHS] type is larger, return it. 2725 if (RHSRank >= LHSRank) 2726 return -1; 2727 2728 // If the signed type can represent all values of the unsigned type, it 2729 // wins. Because we are dealing with 2's complement and types that are 2730 // powers of two larger than each other, this is always safe. 2731 return 1; 2732} 2733 2734// getCFConstantStringType - Return the type used for constant CFStrings. 2735QualType ASTContext::getCFConstantStringType() { 2736 if (!CFConstantStringTypeDecl) { 2737 CFConstantStringTypeDecl = 2738 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2739 &Idents.get("NSConstantString")); 2740 QualType FieldTypes[4]; 2741 2742 // const int *isa; 2743 FieldTypes[0] = getPointerType(IntTy.withConst()); 2744 // int flags; 2745 FieldTypes[1] = IntTy; 2746 // const char *str; 2747 FieldTypes[2] = getPointerType(CharTy.withConst()); 2748 // long length; 2749 FieldTypes[3] = LongTy; 2750 2751 // Create fields 2752 for (unsigned i = 0; i < 4; ++i) { 2753 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2754 SourceLocation(), 0, 2755 FieldTypes[i], /*DInfo=*/0, 2756 /*BitWidth=*/0, 2757 /*Mutable=*/false); 2758 CFConstantStringTypeDecl->addDecl(Field); 2759 } 2760 2761 CFConstantStringTypeDecl->completeDefinition(*this); 2762 } 2763 2764 return getTagDeclType(CFConstantStringTypeDecl); 2765} 2766 2767void ASTContext::setCFConstantStringType(QualType T) { 2768 const RecordType *Rec = T->getAs<RecordType>(); 2769 assert(Rec && "Invalid CFConstantStringType"); 2770 CFConstantStringTypeDecl = Rec->getDecl(); 2771} 2772 2773QualType ASTContext::getObjCFastEnumerationStateType() { 2774 if (!ObjCFastEnumerationStateTypeDecl) { 2775 ObjCFastEnumerationStateTypeDecl = 2776 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2777 &Idents.get("__objcFastEnumerationState")); 2778 2779 QualType FieldTypes[] = { 2780 UnsignedLongTy, 2781 getPointerType(ObjCIdTypedefType), 2782 getPointerType(UnsignedLongTy), 2783 getConstantArrayType(UnsignedLongTy, 2784 llvm::APInt(32, 5), ArrayType::Normal, 0) 2785 }; 2786 2787 for (size_t i = 0; i < 4; ++i) { 2788 FieldDecl *Field = FieldDecl::Create(*this, 2789 ObjCFastEnumerationStateTypeDecl, 2790 SourceLocation(), 0, 2791 FieldTypes[i], /*DInfo=*/0, 2792 /*BitWidth=*/0, 2793 /*Mutable=*/false); 2794 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2795 } 2796 2797 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2798 } 2799 2800 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2801} 2802 2803QualType ASTContext::getBlockDescriptorType() { 2804 if (BlockDescriptorType) 2805 return getTagDeclType(BlockDescriptorType); 2806 2807 RecordDecl *T; 2808 // FIXME: Needs the FlagAppleBlock bit. 2809 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2810 &Idents.get("__block_descriptor")); 2811 2812 QualType FieldTypes[] = { 2813 UnsignedLongTy, 2814 UnsignedLongTy, 2815 }; 2816 2817 const char *FieldNames[] = { 2818 "reserved", 2819 "Size" 2820 }; 2821 2822 for (size_t i = 0; i < 2; ++i) { 2823 FieldDecl *Field = FieldDecl::Create(*this, 2824 T, 2825 SourceLocation(), 2826 &Idents.get(FieldNames[i]), 2827 FieldTypes[i], /*DInfo=*/0, 2828 /*BitWidth=*/0, 2829 /*Mutable=*/false); 2830 T->addDecl(Field); 2831 } 2832 2833 T->completeDefinition(*this); 2834 2835 BlockDescriptorType = T; 2836 2837 return getTagDeclType(BlockDescriptorType); 2838} 2839 2840void ASTContext::setBlockDescriptorType(QualType T) { 2841 const RecordType *Rec = T->getAs<RecordType>(); 2842 assert(Rec && "Invalid BlockDescriptorType"); 2843 BlockDescriptorType = Rec->getDecl(); 2844} 2845 2846QualType ASTContext::getBlockDescriptorExtendedType() { 2847 if (BlockDescriptorExtendedType) 2848 return getTagDeclType(BlockDescriptorExtendedType); 2849 2850 RecordDecl *T; 2851 // FIXME: Needs the FlagAppleBlock bit. 2852 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2853 &Idents.get("__block_descriptor_withcopydispose")); 2854 2855 QualType FieldTypes[] = { 2856 UnsignedLongTy, 2857 UnsignedLongTy, 2858 getPointerType(VoidPtrTy), 2859 getPointerType(VoidPtrTy) 2860 }; 2861 2862 const char *FieldNames[] = { 2863 "reserved", 2864 "Size", 2865 "CopyFuncPtr", 2866 "DestroyFuncPtr" 2867 }; 2868 2869 for (size_t i = 0; i < 4; ++i) { 2870 FieldDecl *Field = FieldDecl::Create(*this, 2871 T, 2872 SourceLocation(), 2873 &Idents.get(FieldNames[i]), 2874 FieldTypes[i], /*DInfo=*/0, 2875 /*BitWidth=*/0, 2876 /*Mutable=*/false); 2877 T->addDecl(Field); 2878 } 2879 2880 T->completeDefinition(*this); 2881 2882 BlockDescriptorExtendedType = T; 2883 2884 return getTagDeclType(BlockDescriptorExtendedType); 2885} 2886 2887void ASTContext::setBlockDescriptorExtendedType(QualType T) { 2888 const RecordType *Rec = T->getAs<RecordType>(); 2889 assert(Rec && "Invalid BlockDescriptorType"); 2890 BlockDescriptorExtendedType = Rec->getDecl(); 2891} 2892 2893bool ASTContext::BlockRequiresCopying(QualType Ty) { 2894 if (Ty->isBlockPointerType()) 2895 return true; 2896 if (isObjCNSObjectType(Ty)) 2897 return true; 2898 if (Ty->isObjCObjectPointerType()) 2899 return true; 2900 return false; 2901} 2902 2903QualType ASTContext::BuildByRefType(const char *DeclName, QualType Ty) { 2904 // type = struct __Block_byref_1_X { 2905 // void *__isa; 2906 // struct __Block_byref_1_X *__forwarding; 2907 // unsigned int __flags; 2908 // unsigned int __size; 2909 // void *__copy_helper; // as needed 2910 // void *__destroy_help // as needed 2911 // int X; 2912 // } * 2913 2914 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 2915 2916 // FIXME: Move up 2917 static unsigned int UniqueBlockByRefTypeID = 0; 2918 llvm::SmallString<36> Name; 2919 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 2920 ++UniqueBlockByRefTypeID << '_' << DeclName; 2921 RecordDecl *T; 2922 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2923 &Idents.get(Name.str())); 2924 T->startDefinition(); 2925 QualType Int32Ty = IntTy; 2926 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 2927 QualType FieldTypes[] = { 2928 getPointerType(VoidPtrTy), 2929 getPointerType(getTagDeclType(T)), 2930 Int32Ty, 2931 Int32Ty, 2932 getPointerType(VoidPtrTy), 2933 getPointerType(VoidPtrTy), 2934 Ty 2935 }; 2936 2937 const char *FieldNames[] = { 2938 "__isa", 2939 "__forwarding", 2940 "__flags", 2941 "__size", 2942 "__copy_helper", 2943 "__destroy_helper", 2944 DeclName, 2945 }; 2946 2947 for (size_t i = 0; i < 7; ++i) { 2948 if (!HasCopyAndDispose && i >=4 && i <= 5) 2949 continue; 2950 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2951 &Idents.get(FieldNames[i]), 2952 FieldTypes[i], /*DInfo=*/0, 2953 /*BitWidth=*/0, /*Mutable=*/false); 2954 T->addDecl(Field); 2955 } 2956 2957 T->completeDefinition(*this); 2958 2959 return getPointerType(getTagDeclType(T)); 2960} 2961 2962 2963QualType ASTContext::getBlockParmType( 2964 bool BlockHasCopyDispose, 2965 llvm::SmallVector<const Expr *, 8> &BlockDeclRefDecls) { 2966 // FIXME: Move up 2967 static unsigned int UniqueBlockParmTypeID = 0; 2968 llvm::SmallString<36> Name; 2969 llvm::raw_svector_ostream(Name) << "__block_literal_" 2970 << ++UniqueBlockParmTypeID; 2971 RecordDecl *T; 2972 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2973 &Idents.get(Name.str())); 2974 QualType FieldTypes[] = { 2975 getPointerType(VoidPtrTy), 2976 IntTy, 2977 IntTy, 2978 getPointerType(VoidPtrTy), 2979 (BlockHasCopyDispose ? 2980 getPointerType(getBlockDescriptorExtendedType()) : 2981 getPointerType(getBlockDescriptorType())) 2982 }; 2983 2984 const char *FieldNames[] = { 2985 "__isa", 2986 "__flags", 2987 "__reserved", 2988 "__FuncPtr", 2989 "__descriptor" 2990 }; 2991 2992 for (size_t i = 0; i < 5; ++i) { 2993 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2994 &Idents.get(FieldNames[i]), 2995 FieldTypes[i], /*DInfo=*/0, 2996 /*BitWidth=*/0, /*Mutable=*/false); 2997 T->addDecl(Field); 2998 } 2999 3000 for (size_t i = 0; i < BlockDeclRefDecls.size(); ++i) { 3001 const Expr *E = BlockDeclRefDecls[i]; 3002 const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); 3003 clang::IdentifierInfo *Name = 0; 3004 if (BDRE) { 3005 const ValueDecl *D = BDRE->getDecl(); 3006 Name = &Idents.get(D->getName()); 3007 } 3008 QualType FieldType = E->getType(); 3009 3010 if (BDRE && BDRE->isByRef()) 3011 FieldType = BuildByRefType(BDRE->getDecl()->getNameAsCString(), 3012 FieldType); 3013 3014 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3015 Name, FieldType, /*DInfo=*/0, 3016 /*BitWidth=*/0, /*Mutable=*/false); 3017 T->addDecl(Field); 3018 } 3019 3020 T->completeDefinition(*this); 3021 3022 return getPointerType(getTagDeclType(T)); 3023} 3024 3025void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3026 const RecordType *Rec = T->getAs<RecordType>(); 3027 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3028 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3029} 3030 3031// This returns true if a type has been typedefed to BOOL: 3032// typedef <type> BOOL; 3033static bool isTypeTypedefedAsBOOL(QualType T) { 3034 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3035 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3036 return II->isStr("BOOL"); 3037 3038 return false; 3039} 3040 3041/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3042/// purpose. 3043int ASTContext::getObjCEncodingTypeSize(QualType type) { 3044 uint64_t sz = getTypeSize(type); 3045 3046 // Make all integer and enum types at least as large as an int 3047 if (sz > 0 && type->isIntegralType()) 3048 sz = std::max(sz, getTypeSize(IntTy)); 3049 // Treat arrays as pointers, since that's how they're passed in. 3050 else if (type->isArrayType()) 3051 sz = getTypeSize(VoidPtrTy); 3052 return sz / getTypeSize(CharTy); 3053} 3054 3055/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3056/// declaration. 3057void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3058 std::string& S) { 3059 // FIXME: This is not very efficient. 3060 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3061 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3062 // Encode result type. 3063 getObjCEncodingForType(Decl->getResultType(), S); 3064 // Compute size of all parameters. 3065 // Start with computing size of a pointer in number of bytes. 3066 // FIXME: There might(should) be a better way of doing this computation! 3067 SourceLocation Loc; 3068 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 3069 // The first two arguments (self and _cmd) are pointers; account for 3070 // their size. 3071 int ParmOffset = 2 * PtrSize; 3072 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3073 E = Decl->param_end(); PI != E; ++PI) { 3074 QualType PType = (*PI)->getType(); 3075 int sz = getObjCEncodingTypeSize(PType); 3076 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 3077 ParmOffset += sz; 3078 } 3079 S += llvm::utostr(ParmOffset); 3080 S += "@0:"; 3081 S += llvm::utostr(PtrSize); 3082 3083 // Argument types. 3084 ParmOffset = 2 * PtrSize; 3085 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3086 E = Decl->param_end(); PI != E; ++PI) { 3087 ParmVarDecl *PVDecl = *PI; 3088 QualType PType = PVDecl->getOriginalType(); 3089 if (const ArrayType *AT = 3090 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3091 // Use array's original type only if it has known number of 3092 // elements. 3093 if (!isa<ConstantArrayType>(AT)) 3094 PType = PVDecl->getType(); 3095 } else if (PType->isFunctionType()) 3096 PType = PVDecl->getType(); 3097 // Process argument qualifiers for user supplied arguments; such as, 3098 // 'in', 'inout', etc. 3099 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3100 getObjCEncodingForType(PType, S); 3101 S += llvm::utostr(ParmOffset); 3102 ParmOffset += getObjCEncodingTypeSize(PType); 3103 } 3104} 3105 3106/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3107/// property declaration. If non-NULL, Container must be either an 3108/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3109/// NULL when getting encodings for protocol properties. 3110/// Property attributes are stored as a comma-delimited C string. The simple 3111/// attributes readonly and bycopy are encoded as single characters. The 3112/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3113/// encoded as single characters, followed by an identifier. Property types 3114/// are also encoded as a parametrized attribute. The characters used to encode 3115/// these attributes are defined by the following enumeration: 3116/// @code 3117/// enum PropertyAttributes { 3118/// kPropertyReadOnly = 'R', // property is read-only. 3119/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3120/// kPropertyByref = '&', // property is a reference to the value last assigned 3121/// kPropertyDynamic = 'D', // property is dynamic 3122/// kPropertyGetter = 'G', // followed by getter selector name 3123/// kPropertySetter = 'S', // followed by setter selector name 3124/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3125/// kPropertyType = 't' // followed by old-style type encoding. 3126/// kPropertyWeak = 'W' // 'weak' property 3127/// kPropertyStrong = 'P' // property GC'able 3128/// kPropertyNonAtomic = 'N' // property non-atomic 3129/// }; 3130/// @endcode 3131void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3132 const Decl *Container, 3133 std::string& S) { 3134 // Collect information from the property implementation decl(s). 3135 bool Dynamic = false; 3136 ObjCPropertyImplDecl *SynthesizePID = 0; 3137 3138 // FIXME: Duplicated code due to poor abstraction. 3139 if (Container) { 3140 if (const ObjCCategoryImplDecl *CID = 3141 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3142 for (ObjCCategoryImplDecl::propimpl_iterator 3143 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3144 i != e; ++i) { 3145 ObjCPropertyImplDecl *PID = *i; 3146 if (PID->getPropertyDecl() == PD) { 3147 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3148 Dynamic = true; 3149 } else { 3150 SynthesizePID = PID; 3151 } 3152 } 3153 } 3154 } else { 3155 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3156 for (ObjCCategoryImplDecl::propimpl_iterator 3157 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3158 i != e; ++i) { 3159 ObjCPropertyImplDecl *PID = *i; 3160 if (PID->getPropertyDecl() == PD) { 3161 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3162 Dynamic = true; 3163 } else { 3164 SynthesizePID = PID; 3165 } 3166 } 3167 } 3168 } 3169 } 3170 3171 // FIXME: This is not very efficient. 3172 S = "T"; 3173 3174 // Encode result type. 3175 // GCC has some special rules regarding encoding of properties which 3176 // closely resembles encoding of ivars. 3177 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3178 true /* outermost type */, 3179 true /* encoding for property */); 3180 3181 if (PD->isReadOnly()) { 3182 S += ",R"; 3183 } else { 3184 switch (PD->getSetterKind()) { 3185 case ObjCPropertyDecl::Assign: break; 3186 case ObjCPropertyDecl::Copy: S += ",C"; break; 3187 case ObjCPropertyDecl::Retain: S += ",&"; break; 3188 } 3189 } 3190 3191 // It really isn't clear at all what this means, since properties 3192 // are "dynamic by default". 3193 if (Dynamic) 3194 S += ",D"; 3195 3196 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3197 S += ",N"; 3198 3199 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3200 S += ",G"; 3201 S += PD->getGetterName().getAsString(); 3202 } 3203 3204 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3205 S += ",S"; 3206 S += PD->getSetterName().getAsString(); 3207 } 3208 3209 if (SynthesizePID) { 3210 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3211 S += ",V"; 3212 S += OID->getNameAsString(); 3213 } 3214 3215 // FIXME: OBJCGC: weak & strong 3216} 3217 3218/// getLegacyIntegralTypeEncoding - 3219/// Another legacy compatibility encoding: 32-bit longs are encoded as 3220/// 'l' or 'L' , but not always. For typedefs, we need to use 3221/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3222/// 3223void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3224 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3225 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3226 if (BT->getKind() == BuiltinType::ULong && 3227 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3228 PointeeTy = UnsignedIntTy; 3229 else 3230 if (BT->getKind() == BuiltinType::Long && 3231 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3232 PointeeTy = IntTy; 3233 } 3234 } 3235} 3236 3237void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3238 const FieldDecl *Field) { 3239 // We follow the behavior of gcc, expanding structures which are 3240 // directly pointed to, and expanding embedded structures. Note that 3241 // these rules are sufficient to prevent recursive encoding of the 3242 // same type. 3243 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3244 true /* outermost type */); 3245} 3246 3247static void EncodeBitField(const ASTContext *Context, std::string& S, 3248 const FieldDecl *FD) { 3249 const Expr *E = FD->getBitWidth(); 3250 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3251 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3252 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3253 S += 'b'; 3254 S += llvm::utostr(N); 3255} 3256 3257// FIXME: Use SmallString for accumulating string. 3258void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3259 bool ExpandPointedToStructures, 3260 bool ExpandStructures, 3261 const FieldDecl *FD, 3262 bool OutermostType, 3263 bool EncodingProperty) { 3264 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3265 if (FD && FD->isBitField()) 3266 return EncodeBitField(this, S, FD); 3267 char encoding; 3268 switch (BT->getKind()) { 3269 default: assert(0 && "Unhandled builtin type kind"); 3270 case BuiltinType::Void: encoding = 'v'; break; 3271 case BuiltinType::Bool: encoding = 'B'; break; 3272 case BuiltinType::Char_U: 3273 case BuiltinType::UChar: encoding = 'C'; break; 3274 case BuiltinType::UShort: encoding = 'S'; break; 3275 case BuiltinType::UInt: encoding = 'I'; break; 3276 case BuiltinType::ULong: 3277 encoding = 3278 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3279 break; 3280 case BuiltinType::UInt128: encoding = 'T'; break; 3281 case BuiltinType::ULongLong: encoding = 'Q'; break; 3282 case BuiltinType::Char_S: 3283 case BuiltinType::SChar: encoding = 'c'; break; 3284 case BuiltinType::Short: encoding = 's'; break; 3285 case BuiltinType::Int: encoding = 'i'; break; 3286 case BuiltinType::Long: 3287 encoding = 3288 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3289 break; 3290 case BuiltinType::LongLong: encoding = 'q'; break; 3291 case BuiltinType::Int128: encoding = 't'; break; 3292 case BuiltinType::Float: encoding = 'f'; break; 3293 case BuiltinType::Double: encoding = 'd'; break; 3294 case BuiltinType::LongDouble: encoding = 'd'; break; 3295 } 3296 3297 S += encoding; 3298 return; 3299 } 3300 3301 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3302 S += 'j'; 3303 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3304 false); 3305 return; 3306 } 3307 3308 if (const PointerType *PT = T->getAs<PointerType>()) { 3309 QualType PointeeTy = PT->getPointeeType(); 3310 bool isReadOnly = false; 3311 // For historical/compatibility reasons, the read-only qualifier of the 3312 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3313 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3314 // Also, do not emit the 'r' for anything but the outermost type! 3315 if (isa<TypedefType>(T.getTypePtr())) { 3316 if (OutermostType && T.isConstQualified()) { 3317 isReadOnly = true; 3318 S += 'r'; 3319 } 3320 } else if (OutermostType) { 3321 QualType P = PointeeTy; 3322 while (P->getAs<PointerType>()) 3323 P = P->getAs<PointerType>()->getPointeeType(); 3324 if (P.isConstQualified()) { 3325 isReadOnly = true; 3326 S += 'r'; 3327 } 3328 } 3329 if (isReadOnly) { 3330 // Another legacy compatibility encoding. Some ObjC qualifier and type 3331 // combinations need to be rearranged. 3332 // Rewrite "in const" from "nr" to "rn" 3333 const char * s = S.c_str(); 3334 int len = S.length(); 3335 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3336 std::string replace = "rn"; 3337 S.replace(S.end()-2, S.end(), replace); 3338 } 3339 } 3340 if (isObjCSelType(PointeeTy)) { 3341 S += ':'; 3342 return; 3343 } 3344 3345 if (PointeeTy->isCharType()) { 3346 // char pointer types should be encoded as '*' unless it is a 3347 // type that has been typedef'd to 'BOOL'. 3348 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3349 S += '*'; 3350 return; 3351 } 3352 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3353 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3354 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3355 S += '#'; 3356 return; 3357 } 3358 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3359 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3360 S += '@'; 3361 return; 3362 } 3363 // fall through... 3364 } 3365 S += '^'; 3366 getLegacyIntegralTypeEncoding(PointeeTy); 3367 3368 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3369 NULL); 3370 return; 3371 } 3372 3373 if (const ArrayType *AT = 3374 // Ignore type qualifiers etc. 3375 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3376 if (isa<IncompleteArrayType>(AT)) { 3377 // Incomplete arrays are encoded as a pointer to the array element. 3378 S += '^'; 3379 3380 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3381 false, ExpandStructures, FD); 3382 } else { 3383 S += '['; 3384 3385 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3386 S += llvm::utostr(CAT->getSize().getZExtValue()); 3387 else { 3388 //Variable length arrays are encoded as a regular array with 0 elements. 3389 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3390 S += '0'; 3391 } 3392 3393 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3394 false, ExpandStructures, FD); 3395 S += ']'; 3396 } 3397 return; 3398 } 3399 3400 if (T->getAs<FunctionType>()) { 3401 S += '?'; 3402 return; 3403 } 3404 3405 if (const RecordType *RTy = T->getAs<RecordType>()) { 3406 RecordDecl *RDecl = RTy->getDecl(); 3407 S += RDecl->isUnion() ? '(' : '{'; 3408 // Anonymous structures print as '?' 3409 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3410 S += II->getName(); 3411 } else { 3412 S += '?'; 3413 } 3414 if (ExpandStructures) { 3415 S += '='; 3416 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3417 FieldEnd = RDecl->field_end(); 3418 Field != FieldEnd; ++Field) { 3419 if (FD) { 3420 S += '"'; 3421 S += Field->getNameAsString(); 3422 S += '"'; 3423 } 3424 3425 // Special case bit-fields. 3426 if (Field->isBitField()) { 3427 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3428 (*Field)); 3429 } else { 3430 QualType qt = Field->getType(); 3431 getLegacyIntegralTypeEncoding(qt); 3432 getObjCEncodingForTypeImpl(qt, S, false, true, 3433 FD); 3434 } 3435 } 3436 } 3437 S += RDecl->isUnion() ? ')' : '}'; 3438 return; 3439 } 3440 3441 if (T->isEnumeralType()) { 3442 if (FD && FD->isBitField()) 3443 EncodeBitField(this, S, FD); 3444 else 3445 S += 'i'; 3446 return; 3447 } 3448 3449 if (T->isBlockPointerType()) { 3450 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3451 return; 3452 } 3453 3454 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3455 // @encode(class_name) 3456 ObjCInterfaceDecl *OI = OIT->getDecl(); 3457 S += '{'; 3458 const IdentifierInfo *II = OI->getIdentifier(); 3459 S += II->getName(); 3460 S += '='; 3461 llvm::SmallVector<FieldDecl*, 32> RecFields; 3462 CollectObjCIvars(OI, RecFields); 3463 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3464 if (RecFields[i]->isBitField()) 3465 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3466 RecFields[i]); 3467 else 3468 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3469 FD); 3470 } 3471 S += '}'; 3472 return; 3473 } 3474 3475 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3476 if (OPT->isObjCIdType()) { 3477 S += '@'; 3478 return; 3479 } 3480 3481 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 3482 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 3483 // Since this is a binary compatibility issue, need to consult with runtime 3484 // folks. Fortunately, this is a *very* obsure construct. 3485 S += '#'; 3486 return; 3487 } 3488 3489 if (OPT->isObjCQualifiedIdType()) { 3490 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3491 ExpandPointedToStructures, 3492 ExpandStructures, FD); 3493 if (FD || EncodingProperty) { 3494 // Note that we do extended encoding of protocol qualifer list 3495 // Only when doing ivar or property encoding. 3496 S += '"'; 3497 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3498 E = OPT->qual_end(); I != E; ++I) { 3499 S += '<'; 3500 S += (*I)->getNameAsString(); 3501 S += '>'; 3502 } 3503 S += '"'; 3504 } 3505 return; 3506 } 3507 3508 QualType PointeeTy = OPT->getPointeeType(); 3509 if (!EncodingProperty && 3510 isa<TypedefType>(PointeeTy.getTypePtr())) { 3511 // Another historical/compatibility reason. 3512 // We encode the underlying type which comes out as 3513 // {...}; 3514 S += '^'; 3515 getObjCEncodingForTypeImpl(PointeeTy, S, 3516 false, ExpandPointedToStructures, 3517 NULL); 3518 return; 3519 } 3520 3521 S += '@'; 3522 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 3523 S += '"'; 3524 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 3525 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3526 E = OPT->qual_end(); I != E; ++I) { 3527 S += '<'; 3528 S += (*I)->getNameAsString(); 3529 S += '>'; 3530 } 3531 S += '"'; 3532 } 3533 return; 3534 } 3535 3536 assert(0 && "@encode for type not implemented!"); 3537} 3538 3539void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3540 std::string& S) const { 3541 if (QT & Decl::OBJC_TQ_In) 3542 S += 'n'; 3543 if (QT & Decl::OBJC_TQ_Inout) 3544 S += 'N'; 3545 if (QT & Decl::OBJC_TQ_Out) 3546 S += 'o'; 3547 if (QT & Decl::OBJC_TQ_Bycopy) 3548 S += 'O'; 3549 if (QT & Decl::OBJC_TQ_Byref) 3550 S += 'R'; 3551 if (QT & Decl::OBJC_TQ_Oneway) 3552 S += 'V'; 3553} 3554 3555void ASTContext::setBuiltinVaListType(QualType T) { 3556 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3557 3558 BuiltinVaListType = T; 3559} 3560 3561void ASTContext::setObjCIdType(QualType T) { 3562 ObjCIdTypedefType = T; 3563} 3564 3565void ASTContext::setObjCSelType(QualType T) { 3566 ObjCSelType = T; 3567 3568 const TypedefType *TT = T->getAs<TypedefType>(); 3569 if (!TT) 3570 return; 3571 TypedefDecl *TD = TT->getDecl(); 3572 3573 // typedef struct objc_selector *SEL; 3574 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3575 if (!ptr) 3576 return; 3577 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3578 if (!rec) 3579 return; 3580 SelStructType = rec; 3581} 3582 3583void ASTContext::setObjCProtoType(QualType QT) { 3584 ObjCProtoType = QT; 3585} 3586 3587void ASTContext::setObjCClassType(QualType T) { 3588 ObjCClassTypedefType = T; 3589} 3590 3591void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3592 assert(ObjCConstantStringType.isNull() && 3593 "'NSConstantString' type already set!"); 3594 3595 ObjCConstantStringType = getObjCInterfaceType(Decl); 3596} 3597 3598/// \brief Retrieve the template name that represents a qualified 3599/// template name such as \c std::vector. 3600TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3601 bool TemplateKeyword, 3602 TemplateDecl *Template) { 3603 llvm::FoldingSetNodeID ID; 3604 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3605 3606 void *InsertPos = 0; 3607 QualifiedTemplateName *QTN = 3608 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3609 if (!QTN) { 3610 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3611 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3612 } 3613 3614 return TemplateName(QTN); 3615} 3616 3617/// \brief Retrieve the template name that represents a qualified 3618/// template name such as \c std::vector. 3619TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3620 bool TemplateKeyword, 3621 OverloadedFunctionDecl *Template) { 3622 llvm::FoldingSetNodeID ID; 3623 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3624 3625 void *InsertPos = 0; 3626 QualifiedTemplateName *QTN = 3627 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3628 if (!QTN) { 3629 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3630 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3631 } 3632 3633 return TemplateName(QTN); 3634} 3635 3636/// \brief Retrieve the template name that represents a dependent 3637/// template name such as \c MetaFun::template apply. 3638TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3639 const IdentifierInfo *Name) { 3640 assert((!NNS || NNS->isDependent()) && 3641 "Nested name specifier must be dependent"); 3642 3643 llvm::FoldingSetNodeID ID; 3644 DependentTemplateName::Profile(ID, NNS, Name); 3645 3646 void *InsertPos = 0; 3647 DependentTemplateName *QTN = 3648 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3649 3650 if (QTN) 3651 return TemplateName(QTN); 3652 3653 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3654 if (CanonNNS == NNS) { 3655 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3656 } else { 3657 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3658 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3659 } 3660 3661 DependentTemplateNames.InsertNode(QTN, InsertPos); 3662 return TemplateName(QTN); 3663} 3664 3665/// getFromTargetType - Given one of the integer types provided by 3666/// TargetInfo, produce the corresponding type. The unsigned @p Type 3667/// is actually a value of type @c TargetInfo::IntType. 3668CanQualType ASTContext::getFromTargetType(unsigned Type) const { 3669 switch (Type) { 3670 case TargetInfo::NoInt: return CanQualType(); 3671 case TargetInfo::SignedShort: return ShortTy; 3672 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3673 case TargetInfo::SignedInt: return IntTy; 3674 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3675 case TargetInfo::SignedLong: return LongTy; 3676 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3677 case TargetInfo::SignedLongLong: return LongLongTy; 3678 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3679 } 3680 3681 assert(false && "Unhandled TargetInfo::IntType value"); 3682 return CanQualType(); 3683} 3684 3685//===----------------------------------------------------------------------===// 3686// Type Predicates. 3687//===----------------------------------------------------------------------===// 3688 3689/// isObjCNSObjectType - Return true if this is an NSObject object using 3690/// NSObject attribute on a c-style pointer type. 3691/// FIXME - Make it work directly on types. 3692/// FIXME: Move to Type. 3693/// 3694bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3695 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3696 if (TypedefDecl *TD = TDT->getDecl()) 3697 if (TD->getAttr<ObjCNSObjectAttr>()) 3698 return true; 3699 } 3700 return false; 3701} 3702 3703/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3704/// garbage collection attribute. 3705/// 3706Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3707 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3708 if (getLangOptions().ObjC1 && 3709 getLangOptions().getGCMode() != LangOptions::NonGC) { 3710 GCAttrs = Ty.getObjCGCAttr(); 3711 // Default behavious under objective-c's gc is for objective-c pointers 3712 // (or pointers to them) be treated as though they were declared 3713 // as __strong. 3714 if (GCAttrs == Qualifiers::GCNone) { 3715 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3716 GCAttrs = Qualifiers::Strong; 3717 else if (Ty->isPointerType()) 3718 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3719 } 3720 // Non-pointers have none gc'able attribute regardless of the attribute 3721 // set on them. 3722 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3723 return Qualifiers::GCNone; 3724 } 3725 return GCAttrs; 3726} 3727 3728//===----------------------------------------------------------------------===// 3729// Type Compatibility Testing 3730//===----------------------------------------------------------------------===// 3731 3732/// areCompatVectorTypes - Return true if the two specified vector types are 3733/// compatible. 3734static bool areCompatVectorTypes(const VectorType *LHS, 3735 const VectorType *RHS) { 3736 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 3737 return LHS->getElementType() == RHS->getElementType() && 3738 LHS->getNumElements() == RHS->getNumElements(); 3739} 3740 3741//===----------------------------------------------------------------------===// 3742// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3743//===----------------------------------------------------------------------===// 3744 3745/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3746/// inheritance hierarchy of 'rProto'. 3747bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3748 ObjCProtocolDecl *rProto) { 3749 if (lProto == rProto) 3750 return true; 3751 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3752 E = rProto->protocol_end(); PI != E; ++PI) 3753 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3754 return true; 3755 return false; 3756} 3757 3758/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3759/// return true if lhs's protocols conform to rhs's protocol; false 3760/// otherwise. 3761bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3762 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3763 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3764 return false; 3765} 3766 3767/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3768/// ObjCQualifiedIDType. 3769bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3770 bool compare) { 3771 // Allow id<P..> and an 'id' or void* type in all cases. 3772 if (lhs->isVoidPointerType() || 3773 lhs->isObjCIdType() || lhs->isObjCClassType()) 3774 return true; 3775 else if (rhs->isVoidPointerType() || 3776 rhs->isObjCIdType() || rhs->isObjCClassType()) 3777 return true; 3778 3779 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3780 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3781 3782 if (!rhsOPT) return false; 3783 3784 if (rhsOPT->qual_empty()) { 3785 // If the RHS is a unqualified interface pointer "NSString*", 3786 // make sure we check the class hierarchy. 3787 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3788 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3789 E = lhsQID->qual_end(); I != E; ++I) { 3790 // when comparing an id<P> on lhs with a static type on rhs, 3791 // see if static class implements all of id's protocols, directly or 3792 // through its super class and categories. 3793 if (!rhsID->ClassImplementsProtocol(*I, true)) 3794 return false; 3795 } 3796 } 3797 // If there are no qualifiers and no interface, we have an 'id'. 3798 return true; 3799 } 3800 // Both the right and left sides have qualifiers. 3801 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3802 E = lhsQID->qual_end(); I != E; ++I) { 3803 ObjCProtocolDecl *lhsProto = *I; 3804 bool match = false; 3805 3806 // when comparing an id<P> on lhs with a static type on rhs, 3807 // see if static class implements all of id's protocols, directly or 3808 // through its super class and categories. 3809 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3810 E = rhsOPT->qual_end(); J != E; ++J) { 3811 ObjCProtocolDecl *rhsProto = *J; 3812 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3813 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3814 match = true; 3815 break; 3816 } 3817 } 3818 // If the RHS is a qualified interface pointer "NSString<P>*", 3819 // make sure we check the class hierarchy. 3820 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3821 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3822 E = lhsQID->qual_end(); I != E; ++I) { 3823 // when comparing an id<P> on lhs with a static type on rhs, 3824 // see if static class implements all of id's protocols, directly or 3825 // through its super class and categories. 3826 if (rhsID->ClassImplementsProtocol(*I, true)) { 3827 match = true; 3828 break; 3829 } 3830 } 3831 } 3832 if (!match) 3833 return false; 3834 } 3835 3836 return true; 3837 } 3838 3839 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3840 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3841 3842 if (const ObjCObjectPointerType *lhsOPT = 3843 lhs->getAsObjCInterfacePointerType()) { 3844 if (lhsOPT->qual_empty()) { 3845 bool match = false; 3846 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3847 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3848 E = rhsQID->qual_end(); I != E; ++I) { 3849 // when comparing an id<P> on lhs with a static type on rhs, 3850 // see if static class implements all of id's protocols, directly or 3851 // through its super class and categories. 3852 if (lhsID->ClassImplementsProtocol(*I, true)) { 3853 match = true; 3854 break; 3855 } 3856 } 3857 if (!match) 3858 return false; 3859 } 3860 return true; 3861 } 3862 // Both the right and left sides have qualifiers. 3863 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3864 E = lhsOPT->qual_end(); I != E; ++I) { 3865 ObjCProtocolDecl *lhsProto = *I; 3866 bool match = false; 3867 3868 // when comparing an id<P> on lhs with a static type on rhs, 3869 // see if static class implements all of id's protocols, directly or 3870 // through its super class and categories. 3871 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3872 E = rhsQID->qual_end(); J != E; ++J) { 3873 ObjCProtocolDecl *rhsProto = *J; 3874 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3875 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3876 match = true; 3877 break; 3878 } 3879 } 3880 if (!match) 3881 return false; 3882 } 3883 return true; 3884 } 3885 return false; 3886} 3887 3888/// canAssignObjCInterfaces - Return true if the two interface types are 3889/// compatible for assignment from RHS to LHS. This handles validation of any 3890/// protocol qualifiers on the LHS or RHS. 3891/// 3892bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3893 const ObjCObjectPointerType *RHSOPT) { 3894 // If either type represents the built-in 'id' or 'Class' types, return true. 3895 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3896 return true; 3897 3898 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3899 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3900 QualType(RHSOPT,0), 3901 false); 3902 3903 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3904 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3905 if (LHS && RHS) // We have 2 user-defined types. 3906 return canAssignObjCInterfaces(LHS, RHS); 3907 3908 return false; 3909} 3910 3911/// getIntersectionOfProtocols - This routine finds the intersection of set 3912/// of protocols inherited from two distinct objective-c pointer objects. 3913/// It is used to build composite qualifier list of the composite type of 3914/// the conditional expression involving two objective-c pointer objects. 3915static 3916void getIntersectionOfProtocols(ASTContext &Context, 3917 const ObjCObjectPointerType *LHSOPT, 3918 const ObjCObjectPointerType *RHSOPT, 3919 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 3920 3921 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3922 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3923 3924 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 3925 unsigned LHSNumProtocols = LHS->getNumProtocols(); 3926 if (LHSNumProtocols > 0) 3927 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 3928 else { 3929 llvm::SmallVector<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 3930 Context.CollectInheritedProtocols(LHS->getDecl(), LHSInheritedProtocols); 3931 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 3932 LHSInheritedProtocols.end()); 3933 } 3934 3935 unsigned RHSNumProtocols = RHS->getNumProtocols(); 3936 if (RHSNumProtocols > 0) { 3937 ObjCProtocolDecl **RHSProtocols = (ObjCProtocolDecl **)RHS->qual_begin(); 3938 for (unsigned i = 0; i < RHSNumProtocols; ++i) 3939 if (InheritedProtocolSet.count(RHSProtocols[i])) 3940 IntersectionOfProtocols.push_back(RHSProtocols[i]); 3941 } 3942 else { 3943 llvm::SmallVector<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 3944 Context.CollectInheritedProtocols(RHS->getDecl(), RHSInheritedProtocols); 3945 // FIXME. This may cause duplication of protocols in the list, but should 3946 // be harmless. 3947 for (unsigned i = 0, len = RHSInheritedProtocols.size(); i < len; ++i) 3948 if (InheritedProtocolSet.count(RHSInheritedProtocols[i])) 3949 IntersectionOfProtocols.push_back(RHSInheritedProtocols[i]); 3950 } 3951} 3952 3953/// areCommonBaseCompatible - Returns common base class of the two classes if 3954/// one found. Note that this is O'2 algorithm. But it will be called as the 3955/// last type comparison in a ?-exp of ObjC pointer types before a 3956/// warning is issued. So, its invokation is extremely rare. 3957QualType ASTContext::areCommonBaseCompatible( 3958 const ObjCObjectPointerType *LHSOPT, 3959 const ObjCObjectPointerType *RHSOPT) { 3960 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3961 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3962 if (!LHS || !RHS) 3963 return QualType(); 3964 3965 while (const ObjCInterfaceDecl *LHSIDecl = LHS->getDecl()->getSuperClass()) { 3966 QualType LHSTy = getObjCInterfaceType(LHSIDecl); 3967 LHS = LHSTy->getAs<ObjCInterfaceType>(); 3968 if (canAssignObjCInterfaces(LHS, RHS)) { 3969 llvm::SmallVector<ObjCProtocolDecl *, 8> IntersectionOfProtocols; 3970 getIntersectionOfProtocols(*this, 3971 LHSOPT, RHSOPT, IntersectionOfProtocols); 3972 if (IntersectionOfProtocols.empty()) 3973 LHSTy = getObjCObjectPointerType(LHSTy); 3974 else 3975 LHSTy = getObjCObjectPointerType(LHSTy, &IntersectionOfProtocols[0], 3976 IntersectionOfProtocols.size()); 3977 return LHSTy; 3978 } 3979 } 3980 3981 return QualType(); 3982} 3983 3984bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3985 const ObjCInterfaceType *RHS) { 3986 // Verify that the base decls are compatible: the RHS must be a subclass of 3987 // the LHS. 3988 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3989 return false; 3990 3991 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3992 // protocol qualified at all, then we are good. 3993 if (LHS->getNumProtocols() == 0) 3994 return true; 3995 3996 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3997 // isn't a superset. 3998 if (RHS->getNumProtocols() == 0) 3999 return true; // FIXME: should return false! 4000 4001 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 4002 LHSPE = LHS->qual_end(); 4003 LHSPI != LHSPE; LHSPI++) { 4004 bool RHSImplementsProtocol = false; 4005 4006 // If the RHS doesn't implement the protocol on the left, the types 4007 // are incompatible. 4008 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 4009 RHSPE = RHS->qual_end(); 4010 RHSPI != RHSPE; RHSPI++) { 4011 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4012 RHSImplementsProtocol = true; 4013 break; 4014 } 4015 } 4016 // FIXME: For better diagnostics, consider passing back the protocol name. 4017 if (!RHSImplementsProtocol) 4018 return false; 4019 } 4020 // The RHS implements all protocols listed on the LHS. 4021 return true; 4022} 4023 4024bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4025 // get the "pointed to" types 4026 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4027 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4028 4029 if (!LHSOPT || !RHSOPT) 4030 return false; 4031 4032 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4033 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4034} 4035 4036/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4037/// both shall have the identically qualified version of a compatible type. 4038/// C99 6.2.7p1: Two types have compatible types if their types are the 4039/// same. See 6.7.[2,3,5] for additional rules. 4040bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 4041 return !mergeTypes(LHS, RHS).isNull(); 4042} 4043 4044QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 4045 const FunctionType *lbase = lhs->getAs<FunctionType>(); 4046 const FunctionType *rbase = rhs->getAs<FunctionType>(); 4047 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 4048 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 4049 bool allLTypes = true; 4050 bool allRTypes = true; 4051 4052 // Check return type 4053 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 4054 if (retType.isNull()) return QualType(); 4055 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 4056 allLTypes = false; 4057 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 4058 allRTypes = false; 4059 // FIXME: double check this 4060 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 4061 if (NoReturn != lbase->getNoReturnAttr()) 4062 allLTypes = false; 4063 if (NoReturn != rbase->getNoReturnAttr()) 4064 allRTypes = false; 4065 4066 if (lproto && rproto) { // two C99 style function prototypes 4067 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 4068 "C++ shouldn't be here"); 4069 unsigned lproto_nargs = lproto->getNumArgs(); 4070 unsigned rproto_nargs = rproto->getNumArgs(); 4071 4072 // Compatible functions must have the same number of arguments 4073 if (lproto_nargs != rproto_nargs) 4074 return QualType(); 4075 4076 // Variadic and non-variadic functions aren't compatible 4077 if (lproto->isVariadic() != rproto->isVariadic()) 4078 return QualType(); 4079 4080 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 4081 return QualType(); 4082 4083 // Check argument compatibility 4084 llvm::SmallVector<QualType, 10> types; 4085 for (unsigned i = 0; i < lproto_nargs; i++) { 4086 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 4087 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 4088 QualType argtype = mergeTypes(largtype, rargtype); 4089 if (argtype.isNull()) return QualType(); 4090 types.push_back(argtype); 4091 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 4092 allLTypes = false; 4093 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 4094 allRTypes = false; 4095 } 4096 if (allLTypes) return lhs; 4097 if (allRTypes) return rhs; 4098 return getFunctionType(retType, types.begin(), types.size(), 4099 lproto->isVariadic(), lproto->getTypeQuals(), 4100 NoReturn); 4101 } 4102 4103 if (lproto) allRTypes = false; 4104 if (rproto) allLTypes = false; 4105 4106 const FunctionProtoType *proto = lproto ? lproto : rproto; 4107 if (proto) { 4108 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 4109 if (proto->isVariadic()) return QualType(); 4110 // Check that the types are compatible with the types that 4111 // would result from default argument promotions (C99 6.7.5.3p15). 4112 // The only types actually affected are promotable integer 4113 // types and floats, which would be passed as a different 4114 // type depending on whether the prototype is visible. 4115 unsigned proto_nargs = proto->getNumArgs(); 4116 for (unsigned i = 0; i < proto_nargs; ++i) { 4117 QualType argTy = proto->getArgType(i); 4118 if (argTy->isPromotableIntegerType() || 4119 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 4120 return QualType(); 4121 } 4122 4123 if (allLTypes) return lhs; 4124 if (allRTypes) return rhs; 4125 return getFunctionType(retType, proto->arg_type_begin(), 4126 proto->getNumArgs(), proto->isVariadic(), 4127 proto->getTypeQuals(), NoReturn); 4128 } 4129 4130 if (allLTypes) return lhs; 4131 if (allRTypes) return rhs; 4132 return getFunctionNoProtoType(retType, NoReturn); 4133} 4134 4135QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 4136 // C++ [expr]: If an expression initially has the type "reference to T", the 4137 // type is adjusted to "T" prior to any further analysis, the expression 4138 // designates the object or function denoted by the reference, and the 4139 // expression is an lvalue unless the reference is an rvalue reference and 4140 // the expression is a function call (possibly inside parentheses). 4141 // FIXME: C++ shouldn't be going through here! The rules are different 4142 // enough that they should be handled separately. 4143 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 4144 // shouldn't be going through here! 4145 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 4146 LHS = RT->getPointeeType(); 4147 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 4148 RHS = RT->getPointeeType(); 4149 4150 QualType LHSCan = getCanonicalType(LHS), 4151 RHSCan = getCanonicalType(RHS); 4152 4153 // If two types are identical, they are compatible. 4154 if (LHSCan == RHSCan) 4155 return LHS; 4156 4157 // If the qualifiers are different, the types aren't compatible... mostly. 4158 Qualifiers LQuals = LHSCan.getQualifiers(); 4159 Qualifiers RQuals = RHSCan.getQualifiers(); 4160 if (LQuals != RQuals) { 4161 // If any of these qualifiers are different, we have a type 4162 // mismatch. 4163 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 4164 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 4165 return QualType(); 4166 4167 // Exactly one GC qualifier difference is allowed: __strong is 4168 // okay if the other type has no GC qualifier but is an Objective 4169 // C object pointer (i.e. implicitly strong by default). We fix 4170 // this by pretending that the unqualified type was actually 4171 // qualified __strong. 4172 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 4173 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 4174 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 4175 4176 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 4177 return QualType(); 4178 4179 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 4180 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 4181 } 4182 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 4183 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 4184 } 4185 return QualType(); 4186 } 4187 4188 // Okay, qualifiers are equal. 4189 4190 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 4191 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 4192 4193 // We want to consider the two function types to be the same for these 4194 // comparisons, just force one to the other. 4195 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 4196 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 4197 4198 // Same as above for arrays 4199 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 4200 LHSClass = Type::ConstantArray; 4201 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 4202 RHSClass = Type::ConstantArray; 4203 4204 // Canonicalize ExtVector -> Vector. 4205 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 4206 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 4207 4208 // If the canonical type classes don't match. 4209 if (LHSClass != RHSClass) { 4210 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 4211 // a signed integer type, or an unsigned integer type. 4212 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 4213 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 4214 return RHS; 4215 } 4216 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 4217 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 4218 return LHS; 4219 } 4220 4221 return QualType(); 4222 } 4223 4224 // The canonical type classes match. 4225 switch (LHSClass) { 4226#define TYPE(Class, Base) 4227#define ABSTRACT_TYPE(Class, Base) 4228#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4229#define DEPENDENT_TYPE(Class, Base) case Type::Class: 4230#include "clang/AST/TypeNodes.def" 4231 assert(false && "Non-canonical and dependent types shouldn't get here"); 4232 return QualType(); 4233 4234 case Type::LValueReference: 4235 case Type::RValueReference: 4236 case Type::MemberPointer: 4237 assert(false && "C++ should never be in mergeTypes"); 4238 return QualType(); 4239 4240 case Type::IncompleteArray: 4241 case Type::VariableArray: 4242 case Type::FunctionProto: 4243 case Type::ExtVector: 4244 assert(false && "Types are eliminated above"); 4245 return QualType(); 4246 4247 case Type::Pointer: 4248 { 4249 // Merge two pointer types, while trying to preserve typedef info 4250 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 4251 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 4252 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4253 if (ResultType.isNull()) return QualType(); 4254 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4255 return LHS; 4256 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4257 return RHS; 4258 return getPointerType(ResultType); 4259 } 4260 case Type::BlockPointer: 4261 { 4262 // Merge two block pointer types, while trying to preserve typedef info 4263 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 4264 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 4265 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4266 if (ResultType.isNull()) return QualType(); 4267 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4268 return LHS; 4269 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4270 return RHS; 4271 return getBlockPointerType(ResultType); 4272 } 4273 case Type::ConstantArray: 4274 { 4275 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 4276 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 4277 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 4278 return QualType(); 4279 4280 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 4281 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 4282 QualType ResultType = mergeTypes(LHSElem, RHSElem); 4283 if (ResultType.isNull()) return QualType(); 4284 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4285 return LHS; 4286 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4287 return RHS; 4288 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 4289 ArrayType::ArraySizeModifier(), 0); 4290 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 4291 ArrayType::ArraySizeModifier(), 0); 4292 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 4293 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 4294 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4295 return LHS; 4296 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4297 return RHS; 4298 if (LVAT) { 4299 // FIXME: This isn't correct! But tricky to implement because 4300 // the array's size has to be the size of LHS, but the type 4301 // has to be different. 4302 return LHS; 4303 } 4304 if (RVAT) { 4305 // FIXME: This isn't correct! But tricky to implement because 4306 // the array's size has to be the size of RHS, but the type 4307 // has to be different. 4308 return RHS; 4309 } 4310 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4311 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4312 return getIncompleteArrayType(ResultType, 4313 ArrayType::ArraySizeModifier(), 0); 4314 } 4315 case Type::FunctionNoProto: 4316 return mergeFunctionTypes(LHS, RHS); 4317 case Type::Record: 4318 case Type::Enum: 4319 return QualType(); 4320 case Type::Builtin: 4321 // Only exactly equal builtin types are compatible, which is tested above. 4322 return QualType(); 4323 case Type::Complex: 4324 // Distinct complex types are incompatible. 4325 return QualType(); 4326 case Type::Vector: 4327 // FIXME: The merged type should be an ExtVector! 4328 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 4329 return LHS; 4330 return QualType(); 4331 case Type::ObjCInterface: { 4332 // Check if the interfaces are assignment compatible. 4333 // FIXME: This should be type compatibility, e.g. whether 4334 // "LHS x; RHS x;" at global scope is legal. 4335 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 4336 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 4337 if (LHSIface && RHSIface && 4338 canAssignObjCInterfaces(LHSIface, RHSIface)) 4339 return LHS; 4340 4341 return QualType(); 4342 } 4343 case Type::ObjCObjectPointer: { 4344 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4345 RHS->getAs<ObjCObjectPointerType>())) 4346 return LHS; 4347 4348 return QualType(); 4349 } 4350 case Type::FixedWidthInt: 4351 // Distinct fixed-width integers are not compatible. 4352 return QualType(); 4353 case Type::TemplateSpecialization: 4354 assert(false && "Dependent types have no size"); 4355 break; 4356 } 4357 4358 return QualType(); 4359} 4360 4361//===----------------------------------------------------------------------===// 4362// Integer Predicates 4363//===----------------------------------------------------------------------===// 4364 4365unsigned ASTContext::getIntWidth(QualType T) { 4366 if (T == BoolTy) 4367 return 1; 4368 if (FixedWidthIntType *FWIT = dyn_cast<FixedWidthIntType>(T)) { 4369 return FWIT->getWidth(); 4370 } 4371 // For builtin types, just use the standard type sizing method 4372 return (unsigned)getTypeSize(T); 4373} 4374 4375QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4376 assert(T->isSignedIntegerType() && "Unexpected type"); 4377 4378 // Turn <4 x signed int> -> <4 x unsigned int> 4379 if (const VectorType *VTy = T->getAs<VectorType>()) 4380 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4381 VTy->getNumElements()); 4382 4383 // For enums, we return the unsigned version of the base type. 4384 if (const EnumType *ETy = T->getAs<EnumType>()) 4385 T = ETy->getDecl()->getIntegerType(); 4386 4387 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4388 assert(BTy && "Unexpected signed integer type"); 4389 switch (BTy->getKind()) { 4390 case BuiltinType::Char_S: 4391 case BuiltinType::SChar: 4392 return UnsignedCharTy; 4393 case BuiltinType::Short: 4394 return UnsignedShortTy; 4395 case BuiltinType::Int: 4396 return UnsignedIntTy; 4397 case BuiltinType::Long: 4398 return UnsignedLongTy; 4399 case BuiltinType::LongLong: 4400 return UnsignedLongLongTy; 4401 case BuiltinType::Int128: 4402 return UnsignedInt128Ty; 4403 default: 4404 assert(0 && "Unexpected signed integer type"); 4405 return QualType(); 4406 } 4407} 4408 4409ExternalASTSource::~ExternalASTSource() { } 4410 4411void ExternalASTSource::PrintStats() { } 4412 4413 4414//===----------------------------------------------------------------------===// 4415// Builtin Type Computation 4416//===----------------------------------------------------------------------===// 4417 4418/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4419/// pointer over the consumed characters. This returns the resultant type. 4420static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4421 ASTContext::GetBuiltinTypeError &Error, 4422 bool AllowTypeModifiers = true) { 4423 // Modifiers. 4424 int HowLong = 0; 4425 bool Signed = false, Unsigned = false; 4426 4427 // Read the modifiers first. 4428 bool Done = false; 4429 while (!Done) { 4430 switch (*Str++) { 4431 default: Done = true; --Str; break; 4432 case 'S': 4433 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4434 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4435 Signed = true; 4436 break; 4437 case 'U': 4438 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4439 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4440 Unsigned = true; 4441 break; 4442 case 'L': 4443 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4444 ++HowLong; 4445 break; 4446 } 4447 } 4448 4449 QualType Type; 4450 4451 // Read the base type. 4452 switch (*Str++) { 4453 default: assert(0 && "Unknown builtin type letter!"); 4454 case 'v': 4455 assert(HowLong == 0 && !Signed && !Unsigned && 4456 "Bad modifiers used with 'v'!"); 4457 Type = Context.VoidTy; 4458 break; 4459 case 'f': 4460 assert(HowLong == 0 && !Signed && !Unsigned && 4461 "Bad modifiers used with 'f'!"); 4462 Type = Context.FloatTy; 4463 break; 4464 case 'd': 4465 assert(HowLong < 2 && !Signed && !Unsigned && 4466 "Bad modifiers used with 'd'!"); 4467 if (HowLong) 4468 Type = Context.LongDoubleTy; 4469 else 4470 Type = Context.DoubleTy; 4471 break; 4472 case 's': 4473 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4474 if (Unsigned) 4475 Type = Context.UnsignedShortTy; 4476 else 4477 Type = Context.ShortTy; 4478 break; 4479 case 'i': 4480 if (HowLong == 3) 4481 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4482 else if (HowLong == 2) 4483 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4484 else if (HowLong == 1) 4485 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4486 else 4487 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4488 break; 4489 case 'c': 4490 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4491 if (Signed) 4492 Type = Context.SignedCharTy; 4493 else if (Unsigned) 4494 Type = Context.UnsignedCharTy; 4495 else 4496 Type = Context.CharTy; 4497 break; 4498 case 'b': // boolean 4499 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4500 Type = Context.BoolTy; 4501 break; 4502 case 'z': // size_t. 4503 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4504 Type = Context.getSizeType(); 4505 break; 4506 case 'F': 4507 Type = Context.getCFConstantStringType(); 4508 break; 4509 case 'a': 4510 Type = Context.getBuiltinVaListType(); 4511 assert(!Type.isNull() && "builtin va list type not initialized!"); 4512 break; 4513 case 'A': 4514 // This is a "reference" to a va_list; however, what exactly 4515 // this means depends on how va_list is defined. There are two 4516 // different kinds of va_list: ones passed by value, and ones 4517 // passed by reference. An example of a by-value va_list is 4518 // x86, where va_list is a char*. An example of by-ref va_list 4519 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4520 // we want this argument to be a char*&; for x86-64, we want 4521 // it to be a __va_list_tag*. 4522 Type = Context.getBuiltinVaListType(); 4523 assert(!Type.isNull() && "builtin va list type not initialized!"); 4524 if (Type->isArrayType()) { 4525 Type = Context.getArrayDecayedType(Type); 4526 } else { 4527 Type = Context.getLValueReferenceType(Type); 4528 } 4529 break; 4530 case 'V': { 4531 char *End; 4532 unsigned NumElements = strtoul(Str, &End, 10); 4533 assert(End != Str && "Missing vector size"); 4534 4535 Str = End; 4536 4537 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4538 Type = Context.getVectorType(ElementType, NumElements); 4539 break; 4540 } 4541 case 'X': { 4542 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4543 Type = Context.getComplexType(ElementType); 4544 break; 4545 } 4546 case 'P': 4547 Type = Context.getFILEType(); 4548 if (Type.isNull()) { 4549 Error = ASTContext::GE_Missing_stdio; 4550 return QualType(); 4551 } 4552 break; 4553 case 'J': 4554 if (Signed) 4555 Type = Context.getsigjmp_bufType(); 4556 else 4557 Type = Context.getjmp_bufType(); 4558 4559 if (Type.isNull()) { 4560 Error = ASTContext::GE_Missing_setjmp; 4561 return QualType(); 4562 } 4563 break; 4564 } 4565 4566 if (!AllowTypeModifiers) 4567 return Type; 4568 4569 Done = false; 4570 while (!Done) { 4571 switch (*Str++) { 4572 default: Done = true; --Str; break; 4573 case '*': 4574 Type = Context.getPointerType(Type); 4575 break; 4576 case '&': 4577 Type = Context.getLValueReferenceType(Type); 4578 break; 4579 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4580 case 'C': 4581 Type = Type.withConst(); 4582 break; 4583 } 4584 } 4585 4586 return Type; 4587} 4588 4589/// GetBuiltinType - Return the type for the specified builtin. 4590QualType ASTContext::GetBuiltinType(unsigned id, 4591 GetBuiltinTypeError &Error) { 4592 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4593 4594 llvm::SmallVector<QualType, 8> ArgTypes; 4595 4596 Error = GE_None; 4597 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4598 if (Error != GE_None) 4599 return QualType(); 4600 while (TypeStr[0] && TypeStr[0] != '.') { 4601 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4602 if (Error != GE_None) 4603 return QualType(); 4604 4605 // Do array -> pointer decay. The builtin should use the decayed type. 4606 if (Ty->isArrayType()) 4607 Ty = getArrayDecayedType(Ty); 4608 4609 ArgTypes.push_back(Ty); 4610 } 4611 4612 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4613 "'.' should only occur at end of builtin type list!"); 4614 4615 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4616 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4617 return getFunctionNoProtoType(ResType); 4618 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4619 TypeStr[0] == '.', 0); 4620} 4621 4622QualType 4623ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4624 // Perform the usual unary conversions. We do this early so that 4625 // integral promotions to "int" can allow us to exit early, in the 4626 // lhs == rhs check. Also, for conversion purposes, we ignore any 4627 // qualifiers. For example, "const float" and "float" are 4628 // equivalent. 4629 if (lhs->isPromotableIntegerType()) 4630 lhs = getPromotedIntegerType(lhs); 4631 else 4632 lhs = lhs.getUnqualifiedType(); 4633 if (rhs->isPromotableIntegerType()) 4634 rhs = getPromotedIntegerType(rhs); 4635 else 4636 rhs = rhs.getUnqualifiedType(); 4637 4638 // If both types are identical, no conversion is needed. 4639 if (lhs == rhs) 4640 return lhs; 4641 4642 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4643 // The caller can deal with this (e.g. pointer + int). 4644 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4645 return lhs; 4646 4647 // At this point, we have two different arithmetic types. 4648 4649 // Handle complex types first (C99 6.3.1.8p1). 4650 if (lhs->isComplexType() || rhs->isComplexType()) { 4651 // if we have an integer operand, the result is the complex type. 4652 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4653 // convert the rhs to the lhs complex type. 4654 return lhs; 4655 } 4656 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4657 // convert the lhs to the rhs complex type. 4658 return rhs; 4659 } 4660 // This handles complex/complex, complex/float, or float/complex. 4661 // When both operands are complex, the shorter operand is converted to the 4662 // type of the longer, and that is the type of the result. This corresponds 4663 // to what is done when combining two real floating-point operands. 4664 // The fun begins when size promotion occur across type domains. 4665 // From H&S 6.3.4: When one operand is complex and the other is a real 4666 // floating-point type, the less precise type is converted, within it's 4667 // real or complex domain, to the precision of the other type. For example, 4668 // when combining a "long double" with a "double _Complex", the 4669 // "double _Complex" is promoted to "long double _Complex". 4670 int result = getFloatingTypeOrder(lhs, rhs); 4671 4672 if (result > 0) { // The left side is bigger, convert rhs. 4673 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4674 } else if (result < 0) { // The right side is bigger, convert lhs. 4675 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4676 } 4677 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4678 // domains match. This is a requirement for our implementation, C99 4679 // does not require this promotion. 4680 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4681 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4682 return rhs; 4683 } else { // handle "_Complex double, double". 4684 return lhs; 4685 } 4686 } 4687 return lhs; // The domain/size match exactly. 4688 } 4689 // Now handle "real" floating types (i.e. float, double, long double). 4690 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4691 // if we have an integer operand, the result is the real floating type. 4692 if (rhs->isIntegerType()) { 4693 // convert rhs to the lhs floating point type. 4694 return lhs; 4695 } 4696 if (rhs->isComplexIntegerType()) { 4697 // convert rhs to the complex floating point type. 4698 return getComplexType(lhs); 4699 } 4700 if (lhs->isIntegerType()) { 4701 // convert lhs to the rhs floating point type. 4702 return rhs; 4703 } 4704 if (lhs->isComplexIntegerType()) { 4705 // convert lhs to the complex floating point type. 4706 return getComplexType(rhs); 4707 } 4708 // We have two real floating types, float/complex combos were handled above. 4709 // Convert the smaller operand to the bigger result. 4710 int result = getFloatingTypeOrder(lhs, rhs); 4711 if (result > 0) // convert the rhs 4712 return lhs; 4713 assert(result < 0 && "illegal float comparison"); 4714 return rhs; // convert the lhs 4715 } 4716 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4717 // Handle GCC complex int extension. 4718 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4719 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4720 4721 if (lhsComplexInt && rhsComplexInt) { 4722 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4723 rhsComplexInt->getElementType()) >= 0) 4724 return lhs; // convert the rhs 4725 return rhs; 4726 } else if (lhsComplexInt && rhs->isIntegerType()) { 4727 // convert the rhs to the lhs complex type. 4728 return lhs; 4729 } else if (rhsComplexInt && lhs->isIntegerType()) { 4730 // convert the lhs to the rhs complex type. 4731 return rhs; 4732 } 4733 } 4734 // Finally, we have two differing integer types. 4735 // The rules for this case are in C99 6.3.1.8 4736 int compare = getIntegerTypeOrder(lhs, rhs); 4737 bool lhsSigned = lhs->isSignedIntegerType(), 4738 rhsSigned = rhs->isSignedIntegerType(); 4739 QualType destType; 4740 if (lhsSigned == rhsSigned) { 4741 // Same signedness; use the higher-ranked type 4742 destType = compare >= 0 ? lhs : rhs; 4743 } else if (compare != (lhsSigned ? 1 : -1)) { 4744 // The unsigned type has greater than or equal rank to the 4745 // signed type, so use the unsigned type 4746 destType = lhsSigned ? rhs : lhs; 4747 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4748 // The two types are different widths; if we are here, that 4749 // means the signed type is larger than the unsigned type, so 4750 // use the signed type. 4751 destType = lhsSigned ? lhs : rhs; 4752 } else { 4753 // The signed type is higher-ranked than the unsigned type, 4754 // but isn't actually any bigger (like unsigned int and long 4755 // on most 32-bit systems). Use the unsigned type corresponding 4756 // to the signed type. 4757 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4758 } 4759 return destType; 4760} 4761