ASTContext.cpp revision 632d772a78db7e2cd9b36f8a22aee49d44486fbf
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() || !Cls->isCanonicalUnqualified()) { 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() || 1399 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1400 "Constant array of VLAs is illegal!"); 1401 1402 // Convert the array size into a canonical width matching the pointer size for 1403 // the target. 1404 llvm::APInt ArySize(ArySizeIn); 1405 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1406 1407 llvm::FoldingSetNodeID ID; 1408 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1409 1410 void *InsertPos = 0; 1411 if (ConstantArrayType *ATP = 1412 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1413 return QualType(ATP, 0); 1414 1415 // If the element type isn't canonical, this won't be a canonical type either, 1416 // so fill in the canonical type field. 1417 QualType Canonical; 1418 if (!EltTy.isCanonical()) { 1419 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1420 ASM, EltTypeQuals); 1421 // Get the new insert position for the node we care about. 1422 ConstantArrayType *NewIP = 1423 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1424 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1425 } 1426 1427 ConstantArrayType *New = new(*this,TypeAlignment) 1428 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1429 ConstantArrayTypes.InsertNode(New, InsertPos); 1430 Types.push_back(New); 1431 return QualType(New, 0); 1432} 1433 1434/// getVariableArrayType - Returns a non-unique reference to the type for a 1435/// variable array of the specified element type. 1436QualType ASTContext::getVariableArrayType(QualType EltTy, 1437 Expr *NumElts, 1438 ArrayType::ArraySizeModifier ASM, 1439 unsigned EltTypeQuals, 1440 SourceRange Brackets) { 1441 // Since we don't unique expressions, it isn't possible to unique VLA's 1442 // that have an expression provided for their size. 1443 1444 VariableArrayType *New = new(*this, TypeAlignment) 1445 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1446 1447 VariableArrayTypes.push_back(New); 1448 Types.push_back(New); 1449 return QualType(New, 0); 1450} 1451 1452/// getDependentSizedArrayType - Returns a non-unique reference to 1453/// the type for a dependently-sized array of the specified element 1454/// type. 1455QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1456 Expr *NumElts, 1457 ArrayType::ArraySizeModifier ASM, 1458 unsigned EltTypeQuals, 1459 SourceRange Brackets) { 1460 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1461 "Size must be type- or value-dependent!"); 1462 1463 llvm::FoldingSetNodeID ID; 1464 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1465 EltTypeQuals, NumElts); 1466 1467 void *InsertPos = 0; 1468 DependentSizedArrayType *Canon 1469 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1470 DependentSizedArrayType *New; 1471 if (Canon) { 1472 // We already have a canonical version of this array type; use it as 1473 // the canonical type for a newly-built type. 1474 New = new (*this, TypeAlignment) 1475 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1476 NumElts, ASM, EltTypeQuals, Brackets); 1477 } else { 1478 QualType CanonEltTy = getCanonicalType(EltTy); 1479 if (CanonEltTy == EltTy) { 1480 New = new (*this, TypeAlignment) 1481 DependentSizedArrayType(*this, EltTy, QualType(), 1482 NumElts, ASM, EltTypeQuals, Brackets); 1483 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1484 } else { 1485 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1486 ASM, EltTypeQuals, 1487 SourceRange()); 1488 New = new (*this, TypeAlignment) 1489 DependentSizedArrayType(*this, EltTy, Canon, 1490 NumElts, ASM, EltTypeQuals, Brackets); 1491 } 1492 } 1493 1494 Types.push_back(New); 1495 return QualType(New, 0); 1496} 1497 1498QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1499 ArrayType::ArraySizeModifier ASM, 1500 unsigned EltTypeQuals) { 1501 llvm::FoldingSetNodeID ID; 1502 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1503 1504 void *InsertPos = 0; 1505 if (IncompleteArrayType *ATP = 1506 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1507 return QualType(ATP, 0); 1508 1509 // If the element type isn't canonical, this won't be a canonical type 1510 // either, so fill in the canonical type field. 1511 QualType Canonical; 1512 1513 if (!EltTy.isCanonical()) { 1514 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1515 ASM, EltTypeQuals); 1516 1517 // Get the new insert position for the node we care about. 1518 IncompleteArrayType *NewIP = 1519 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1520 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1521 } 1522 1523 IncompleteArrayType *New = new (*this, TypeAlignment) 1524 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1525 1526 IncompleteArrayTypes.InsertNode(New, InsertPos); 1527 Types.push_back(New); 1528 return QualType(New, 0); 1529} 1530 1531/// getVectorType - Return the unique reference to a vector type of 1532/// the specified element type and size. VectorType must be a built-in type. 1533QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1534 BuiltinType *baseType; 1535 1536 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1537 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1538 1539 // Check if we've already instantiated a vector of this type. 1540 llvm::FoldingSetNodeID ID; 1541 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1542 void *InsertPos = 0; 1543 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1544 return QualType(VTP, 0); 1545 1546 // If the element type isn't canonical, this won't be a canonical type either, 1547 // so fill in the canonical type field. 1548 QualType Canonical; 1549 if (!vecType.isCanonical()) { 1550 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1551 1552 // Get the new insert position for the node we care about. 1553 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1554 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1555 } 1556 VectorType *New = new (*this, TypeAlignment) 1557 VectorType(vecType, NumElts, Canonical); 1558 VectorTypes.InsertNode(New, InsertPos); 1559 Types.push_back(New); 1560 return QualType(New, 0); 1561} 1562 1563/// getExtVectorType - Return the unique reference to an extended vector type of 1564/// the specified element type and size. VectorType must be a built-in type. 1565QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1566 BuiltinType *baseType; 1567 1568 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1569 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1570 1571 // Check if we've already instantiated a vector of this type. 1572 llvm::FoldingSetNodeID ID; 1573 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1574 void *InsertPos = 0; 1575 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1576 return QualType(VTP, 0); 1577 1578 // If the element type isn't canonical, this won't be a canonical type either, 1579 // so fill in the canonical type field. 1580 QualType Canonical; 1581 if (!vecType.isCanonical()) { 1582 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1583 1584 // Get the new insert position for the node we care about. 1585 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1586 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1587 } 1588 ExtVectorType *New = new (*this, TypeAlignment) 1589 ExtVectorType(vecType, NumElts, Canonical); 1590 VectorTypes.InsertNode(New, InsertPos); 1591 Types.push_back(New); 1592 return QualType(New, 0); 1593} 1594 1595QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1596 Expr *SizeExpr, 1597 SourceLocation AttrLoc) { 1598 llvm::FoldingSetNodeID ID; 1599 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1600 SizeExpr); 1601 1602 void *InsertPos = 0; 1603 DependentSizedExtVectorType *Canon 1604 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1605 DependentSizedExtVectorType *New; 1606 if (Canon) { 1607 // We already have a canonical version of this array type; use it as 1608 // the canonical type for a newly-built type. 1609 New = new (*this, TypeAlignment) 1610 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1611 SizeExpr, AttrLoc); 1612 } else { 1613 QualType CanonVecTy = getCanonicalType(vecType); 1614 if (CanonVecTy == vecType) { 1615 New = new (*this, TypeAlignment) 1616 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1617 AttrLoc); 1618 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1619 } else { 1620 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1621 SourceLocation()); 1622 New = new (*this, TypeAlignment) 1623 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1624 } 1625 } 1626 1627 Types.push_back(New); 1628 return QualType(New, 0); 1629} 1630 1631/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1632/// 1633QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1634 // Unique functions, to guarantee there is only one function of a particular 1635 // structure. 1636 llvm::FoldingSetNodeID ID; 1637 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1638 1639 void *InsertPos = 0; 1640 if (FunctionNoProtoType *FT = 1641 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1642 return QualType(FT, 0); 1643 1644 QualType Canonical; 1645 if (!ResultTy.isCanonical()) { 1646 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1647 1648 // Get the new insert position for the node we care about. 1649 FunctionNoProtoType *NewIP = 1650 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1651 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1652 } 1653 1654 FunctionNoProtoType *New = new (*this, TypeAlignment) 1655 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1656 Types.push_back(New); 1657 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1658 return QualType(New, 0); 1659} 1660 1661/// getFunctionType - Return a normal function type with a typed argument 1662/// list. isVariadic indicates whether the argument list includes '...'. 1663QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1664 unsigned NumArgs, bool isVariadic, 1665 unsigned TypeQuals, bool hasExceptionSpec, 1666 bool hasAnyExceptionSpec, unsigned NumExs, 1667 const QualType *ExArray, bool NoReturn) { 1668 // Unique functions, to guarantee there is only one function of a particular 1669 // structure. 1670 llvm::FoldingSetNodeID ID; 1671 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1672 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1673 NumExs, ExArray, NoReturn); 1674 1675 void *InsertPos = 0; 1676 if (FunctionProtoType *FTP = 1677 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1678 return QualType(FTP, 0); 1679 1680 // Determine whether the type being created is already canonical or not. 1681 bool isCanonical = !hasExceptionSpec && ResultTy.isCanonical(); 1682 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1683 if (!ArgArray[i].isCanonicalAsParam()) 1684 isCanonical = false; 1685 1686 // If this type isn't canonical, get the canonical version of it. 1687 // The exception spec is not part of the canonical type. 1688 QualType Canonical; 1689 if (!isCanonical) { 1690 llvm::SmallVector<QualType, 16> CanonicalArgs; 1691 CanonicalArgs.reserve(NumArgs); 1692 for (unsigned i = 0; i != NumArgs; ++i) 1693 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1694 1695 Canonical = getFunctionType(getCanonicalType(ResultTy), 1696 CanonicalArgs.data(), NumArgs, 1697 isVariadic, TypeQuals, false, 1698 false, 0, 0, NoReturn); 1699 1700 // Get the new insert position for the node we care about. 1701 FunctionProtoType *NewIP = 1702 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1703 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1704 } 1705 1706 // FunctionProtoType objects are allocated with extra bytes after them 1707 // for two variable size arrays (for parameter and exception types) at the 1708 // end of them. 1709 FunctionProtoType *FTP = 1710 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1711 NumArgs*sizeof(QualType) + 1712 NumExs*sizeof(QualType), TypeAlignment); 1713 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1714 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1715 ExArray, NumExs, Canonical, NoReturn); 1716 Types.push_back(FTP); 1717 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1718 return QualType(FTP, 0); 1719} 1720 1721/// getTypeDeclType - Return the unique reference to the type for the 1722/// specified type declaration. 1723QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1724 assert(Decl && "Passed null for Decl param"); 1725 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1726 1727 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1728 return getTypedefType(Typedef); 1729 else if (isa<TemplateTypeParmDecl>(Decl)) { 1730 assert(false && "Template type parameter types are always available."); 1731 } else if (ObjCInterfaceDecl *ObjCInterface 1732 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1733 return getObjCInterfaceType(ObjCInterface); 1734 1735 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1736 if (PrevDecl) 1737 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1738 else 1739 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1740 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1741 if (PrevDecl) 1742 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1743 else 1744 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1745 } else 1746 assert(false && "TypeDecl without a type?"); 1747 1748 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1749 return QualType(Decl->TypeForDecl, 0); 1750} 1751 1752/// getTypedefType - Return the unique reference to the type for the 1753/// specified typename decl. 1754QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1755 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1756 1757 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1758 Decl->TypeForDecl = new(*this, TypeAlignment) 1759 TypedefType(Type::Typedef, Decl, Canonical); 1760 Types.push_back(Decl->TypeForDecl); 1761 return QualType(Decl->TypeForDecl, 0); 1762} 1763 1764/// \brief Retrieve a substitution-result type. 1765QualType 1766ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1767 QualType Replacement) { 1768 assert(Replacement.isCanonical() 1769 && "replacement types must always be canonical"); 1770 1771 llvm::FoldingSetNodeID ID; 1772 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1773 void *InsertPos = 0; 1774 SubstTemplateTypeParmType *SubstParm 1775 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1776 1777 if (!SubstParm) { 1778 SubstParm = new (*this, TypeAlignment) 1779 SubstTemplateTypeParmType(Parm, Replacement); 1780 Types.push_back(SubstParm); 1781 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1782 } 1783 1784 return QualType(SubstParm, 0); 1785} 1786 1787/// \brief Retrieve the template type parameter type for a template 1788/// parameter or parameter pack with the given depth, index, and (optionally) 1789/// name. 1790QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1791 bool ParameterPack, 1792 IdentifierInfo *Name) { 1793 llvm::FoldingSetNodeID ID; 1794 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1795 void *InsertPos = 0; 1796 TemplateTypeParmType *TypeParm 1797 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1798 1799 if (TypeParm) 1800 return QualType(TypeParm, 0); 1801 1802 if (Name) { 1803 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1804 TypeParm = new (*this, TypeAlignment) 1805 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1806 } else 1807 TypeParm = new (*this, TypeAlignment) 1808 TemplateTypeParmType(Depth, Index, ParameterPack); 1809 1810 Types.push_back(TypeParm); 1811 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1812 1813 return QualType(TypeParm, 0); 1814} 1815 1816QualType 1817ASTContext::getTemplateSpecializationType(TemplateName Template, 1818 const TemplateArgumentLoc *Args, 1819 unsigned NumArgs, 1820 QualType Canon) { 1821 llvm::SmallVector<TemplateArgument, 4> ArgVec; 1822 ArgVec.reserve(NumArgs); 1823 for (unsigned i = 0; i != NumArgs; ++i) 1824 ArgVec.push_back(Args[i].getArgument()); 1825 1826 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, Canon); 1827} 1828 1829QualType 1830ASTContext::getTemplateSpecializationType(TemplateName Template, 1831 const TemplateArgument *Args, 1832 unsigned NumArgs, 1833 QualType Canon) { 1834 if (!Canon.isNull()) 1835 Canon = getCanonicalType(Canon); 1836 else { 1837 // Build the canonical template specialization type. 1838 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1839 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1840 CanonArgs.reserve(NumArgs); 1841 for (unsigned I = 0; I != NumArgs; ++I) 1842 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1843 1844 // Determine whether this canonical template specialization type already 1845 // exists. 1846 llvm::FoldingSetNodeID ID; 1847 TemplateSpecializationType::Profile(ID, CanonTemplate, 1848 CanonArgs.data(), NumArgs, *this); 1849 1850 void *InsertPos = 0; 1851 TemplateSpecializationType *Spec 1852 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1853 1854 if (!Spec) { 1855 // Allocate a new canonical template specialization type. 1856 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1857 sizeof(TemplateArgument) * NumArgs), 1858 TypeAlignment); 1859 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1860 CanonArgs.data(), NumArgs, 1861 Canon); 1862 Types.push_back(Spec); 1863 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1864 } 1865 1866 if (Canon.isNull()) 1867 Canon = QualType(Spec, 0); 1868 assert(Canon->isDependentType() && 1869 "Non-dependent template-id type must have a canonical type"); 1870 } 1871 1872 // Allocate the (non-canonical) template specialization type, but don't 1873 // try to unique it: these types typically have location information that 1874 // we don't unique and don't want to lose. 1875 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1876 sizeof(TemplateArgument) * NumArgs), 1877 TypeAlignment); 1878 TemplateSpecializationType *Spec 1879 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1880 Canon); 1881 1882 Types.push_back(Spec); 1883 return QualType(Spec, 0); 1884} 1885 1886QualType 1887ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1888 QualType NamedType) { 1889 llvm::FoldingSetNodeID ID; 1890 QualifiedNameType::Profile(ID, NNS, NamedType); 1891 1892 void *InsertPos = 0; 1893 QualifiedNameType *T 1894 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1895 if (T) 1896 return QualType(T, 0); 1897 1898 T = new (*this) QualifiedNameType(NNS, NamedType, 1899 getCanonicalType(NamedType)); 1900 Types.push_back(T); 1901 QualifiedNameTypes.InsertNode(T, InsertPos); 1902 return QualType(T, 0); 1903} 1904 1905QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1906 const IdentifierInfo *Name, 1907 QualType Canon) { 1908 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1909 1910 if (Canon.isNull()) { 1911 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1912 if (CanonNNS != NNS) 1913 Canon = getTypenameType(CanonNNS, Name); 1914 } 1915 1916 llvm::FoldingSetNodeID ID; 1917 TypenameType::Profile(ID, NNS, Name); 1918 1919 void *InsertPos = 0; 1920 TypenameType *T 1921 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1922 if (T) 1923 return QualType(T, 0); 1924 1925 T = new (*this) TypenameType(NNS, Name, Canon); 1926 Types.push_back(T); 1927 TypenameTypes.InsertNode(T, InsertPos); 1928 return QualType(T, 0); 1929} 1930 1931QualType 1932ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1933 const TemplateSpecializationType *TemplateId, 1934 QualType Canon) { 1935 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1936 1937 if (Canon.isNull()) { 1938 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1939 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1940 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1941 const TemplateSpecializationType *CanonTemplateId 1942 = CanonType->getAs<TemplateSpecializationType>(); 1943 assert(CanonTemplateId && 1944 "Canonical type must also be a template specialization type"); 1945 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1946 } 1947 } 1948 1949 llvm::FoldingSetNodeID ID; 1950 TypenameType::Profile(ID, NNS, TemplateId); 1951 1952 void *InsertPos = 0; 1953 TypenameType *T 1954 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1955 if (T) 1956 return QualType(T, 0); 1957 1958 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1959 Types.push_back(T); 1960 TypenameTypes.InsertNode(T, InsertPos); 1961 return QualType(T, 0); 1962} 1963 1964QualType 1965ASTContext::getElaboratedType(QualType UnderlyingType, 1966 ElaboratedType::TagKind Tag) { 1967 llvm::FoldingSetNodeID ID; 1968 ElaboratedType::Profile(ID, UnderlyingType, Tag); 1969 1970 void *InsertPos = 0; 1971 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 1972 if (T) 1973 return QualType(T, 0); 1974 1975 QualType Canon = getCanonicalType(UnderlyingType); 1976 1977 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 1978 Types.push_back(T); 1979 ElaboratedTypes.InsertNode(T, InsertPos); 1980 return QualType(T, 0); 1981} 1982 1983/// CmpProtocolNames - Comparison predicate for sorting protocols 1984/// alphabetically. 1985static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1986 const ObjCProtocolDecl *RHS) { 1987 return LHS->getDeclName() < RHS->getDeclName(); 1988} 1989 1990static bool areSortedAndUniqued(ObjCProtocolDecl **Protocols, 1991 unsigned NumProtocols) { 1992 if (NumProtocols == 0) return true; 1993 1994 for (unsigned i = 1; i != NumProtocols; ++i) 1995 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 1996 return false; 1997 return true; 1998} 1999 2000static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2001 unsigned &NumProtocols) { 2002 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2003 2004 // Sort protocols, keyed by name. 2005 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2006 2007 // Remove duplicates. 2008 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2009 NumProtocols = ProtocolsEnd-Protocols; 2010} 2011 2012/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2013/// the given interface decl and the conforming protocol list. 2014QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 2015 ObjCProtocolDecl **Protocols, 2016 unsigned NumProtocols) { 2017 llvm::FoldingSetNodeID ID; 2018 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 2019 2020 void *InsertPos = 0; 2021 if (ObjCObjectPointerType *QT = 2022 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2023 return QualType(QT, 0); 2024 2025 // Sort the protocol list alphabetically to canonicalize it. 2026 QualType Canonical; 2027 if (!InterfaceT.isCanonical() || 2028 !areSortedAndUniqued(Protocols, NumProtocols)) { 2029 if (!areSortedAndUniqued(Protocols, NumProtocols)) { 2030 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2031 unsigned UniqueCount = NumProtocols; 2032 2033 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2034 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2035 2036 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2037 &Sorted[0], UniqueCount); 2038 } else { 2039 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2040 Protocols, NumProtocols); 2041 } 2042 2043 // Regenerate InsertPos. 2044 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2045 } 2046 2047 // No Match; 2048 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 2049 ObjCObjectPointerType(Canonical, InterfaceT, Protocols, NumProtocols); 2050 2051 Types.push_back(QType); 2052 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2053 return QualType(QType, 0); 2054} 2055 2056/// getObjCInterfaceType - Return the unique reference to the type for the 2057/// specified ObjC interface decl. The list of protocols is optional. 2058QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 2059 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 2060 llvm::FoldingSetNodeID ID; 2061 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 2062 2063 void *InsertPos = 0; 2064 if (ObjCInterfaceType *QT = 2065 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 2066 return QualType(QT, 0); 2067 2068 // Sort the protocol list alphabetically to canonicalize it. 2069 QualType Canonical; 2070 if (NumProtocols && !areSortedAndUniqued(Protocols, NumProtocols)) { 2071 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2072 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2073 2074 unsigned UniqueCount = NumProtocols; 2075 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2076 2077 Canonical = getObjCInterfaceType(Decl, &Sorted[0], UniqueCount); 2078 2079 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos); 2080 } 2081 2082 ObjCInterfaceType *QType = new (*this, TypeAlignment) 2083 ObjCInterfaceType(Canonical, const_cast<ObjCInterfaceDecl*>(Decl), 2084 Protocols, NumProtocols); 2085 2086 Types.push_back(QType); 2087 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 2088 return QualType(QType, 0); 2089} 2090 2091/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2092/// TypeOfExprType AST's (since expression's are never shared). For example, 2093/// multiple declarations that refer to "typeof(x)" all contain different 2094/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2095/// on canonical type's (which are always unique). 2096QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2097 TypeOfExprType *toe; 2098 if (tofExpr->isTypeDependent()) { 2099 llvm::FoldingSetNodeID ID; 2100 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2101 2102 void *InsertPos = 0; 2103 DependentTypeOfExprType *Canon 2104 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2105 if (Canon) { 2106 // We already have a "canonical" version of an identical, dependent 2107 // typeof(expr) type. Use that as our canonical type. 2108 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2109 QualType((TypeOfExprType*)Canon, 0)); 2110 } 2111 else { 2112 // Build a new, canonical typeof(expr) type. 2113 Canon 2114 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2115 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2116 toe = Canon; 2117 } 2118 } else { 2119 QualType Canonical = getCanonicalType(tofExpr->getType()); 2120 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2121 } 2122 Types.push_back(toe); 2123 return QualType(toe, 0); 2124} 2125 2126/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2127/// TypeOfType AST's. The only motivation to unique these nodes would be 2128/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2129/// an issue. This doesn't effect the type checker, since it operates 2130/// on canonical type's (which are always unique). 2131QualType ASTContext::getTypeOfType(QualType tofType) { 2132 QualType Canonical = getCanonicalType(tofType); 2133 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2134 Types.push_back(tot); 2135 return QualType(tot, 0); 2136} 2137 2138/// getDecltypeForExpr - Given an expr, will return the decltype for that 2139/// expression, according to the rules in C++0x [dcl.type.simple]p4 2140static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2141 if (e->isTypeDependent()) 2142 return Context.DependentTy; 2143 2144 // If e is an id expression or a class member access, decltype(e) is defined 2145 // as the type of the entity named by e. 2146 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2147 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2148 return VD->getType(); 2149 } 2150 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2151 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2152 return FD->getType(); 2153 } 2154 // If e is a function call or an invocation of an overloaded operator, 2155 // (parentheses around e are ignored), decltype(e) is defined as the 2156 // return type of that function. 2157 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2158 return CE->getCallReturnType(); 2159 2160 QualType T = e->getType(); 2161 2162 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2163 // defined as T&, otherwise decltype(e) is defined as T. 2164 if (e->isLvalue(Context) == Expr::LV_Valid) 2165 T = Context.getLValueReferenceType(T); 2166 2167 return T; 2168} 2169 2170/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2171/// DecltypeType AST's. The only motivation to unique these nodes would be 2172/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2173/// an issue. This doesn't effect the type checker, since it operates 2174/// on canonical type's (which are always unique). 2175QualType ASTContext::getDecltypeType(Expr *e) { 2176 DecltypeType *dt; 2177 if (e->isTypeDependent()) { 2178 llvm::FoldingSetNodeID ID; 2179 DependentDecltypeType::Profile(ID, *this, e); 2180 2181 void *InsertPos = 0; 2182 DependentDecltypeType *Canon 2183 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2184 if (Canon) { 2185 // We already have a "canonical" version of an equivalent, dependent 2186 // decltype type. Use that as our canonical type. 2187 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2188 QualType((DecltypeType*)Canon, 0)); 2189 } 2190 else { 2191 // Build a new, canonical typeof(expr) type. 2192 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2193 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2194 dt = Canon; 2195 } 2196 } else { 2197 QualType T = getDecltypeForExpr(e, *this); 2198 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2199 } 2200 Types.push_back(dt); 2201 return QualType(dt, 0); 2202} 2203 2204/// getTagDeclType - Return the unique reference to the type for the 2205/// specified TagDecl (struct/union/class/enum) decl. 2206QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2207 assert (Decl); 2208 // FIXME: What is the design on getTagDeclType when it requires casting 2209 // away const? mutable? 2210 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2211} 2212 2213/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2214/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2215/// needs to agree with the definition in <stddef.h>. 2216QualType ASTContext::getSizeType() const { 2217 return getFromTargetType(Target.getSizeType()); 2218} 2219 2220/// getSignedWCharType - Return the type of "signed wchar_t". 2221/// Used when in C++, as a GCC extension. 2222QualType ASTContext::getSignedWCharType() const { 2223 // FIXME: derive from "Target" ? 2224 return WCharTy; 2225} 2226 2227/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2228/// Used when in C++, as a GCC extension. 2229QualType ASTContext::getUnsignedWCharType() const { 2230 // FIXME: derive from "Target" ? 2231 return UnsignedIntTy; 2232} 2233 2234/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2235/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2236QualType ASTContext::getPointerDiffType() const { 2237 return getFromTargetType(Target.getPtrDiffType(0)); 2238} 2239 2240//===----------------------------------------------------------------------===// 2241// Type Operators 2242//===----------------------------------------------------------------------===// 2243 2244CanQualType ASTContext::getCanonicalParamType(QualType T) { 2245 // Push qualifiers into arrays, and then discard any remaining 2246 // qualifiers. 2247 T = getCanonicalType(T); 2248 const Type *Ty = T.getTypePtr(); 2249 2250 QualType Result; 2251 if (isa<ArrayType>(Ty)) { 2252 Result = getArrayDecayedType(QualType(Ty,0)); 2253 } else if (isa<FunctionType>(Ty)) { 2254 Result = getPointerType(QualType(Ty, 0)); 2255 } else { 2256 Result = QualType(Ty, 0); 2257 } 2258 2259 return CanQualType::CreateUnsafe(Result); 2260} 2261 2262/// getCanonicalType - Return the canonical (structural) type corresponding to 2263/// the specified potentially non-canonical type. The non-canonical version 2264/// of a type may have many "decorated" versions of types. Decorators can 2265/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2266/// to be free of any of these, allowing two canonical types to be compared 2267/// for exact equality with a simple pointer comparison. 2268CanQualType ASTContext::getCanonicalType(QualType T) { 2269 QualifierCollector Quals; 2270 const Type *Ptr = Quals.strip(T); 2271 QualType CanType = Ptr->getCanonicalTypeInternal(); 2272 2273 // The canonical internal type will be the canonical type *except* 2274 // that we push type qualifiers down through array types. 2275 2276 // If there are no new qualifiers to push down, stop here. 2277 if (!Quals.hasQualifiers()) 2278 return CanQualType::CreateUnsafe(CanType); 2279 2280 // If the type qualifiers are on an array type, get the canonical 2281 // type of the array with the qualifiers applied to the element 2282 // type. 2283 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2284 if (!AT) 2285 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2286 2287 // Get the canonical version of the element with the extra qualifiers on it. 2288 // This can recursively sink qualifiers through multiple levels of arrays. 2289 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2290 NewEltTy = getCanonicalType(NewEltTy); 2291 2292 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2293 return CanQualType::CreateUnsafe( 2294 getConstantArrayType(NewEltTy, CAT->getSize(), 2295 CAT->getSizeModifier(), 2296 CAT->getIndexTypeCVRQualifiers())); 2297 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2298 return CanQualType::CreateUnsafe( 2299 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2300 IAT->getIndexTypeCVRQualifiers())); 2301 2302 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2303 return CanQualType::CreateUnsafe( 2304 getDependentSizedArrayType(NewEltTy, 2305 DSAT->getSizeExpr() ? 2306 DSAT->getSizeExpr()->Retain() : 0, 2307 DSAT->getSizeModifier(), 2308 DSAT->getIndexTypeCVRQualifiers(), 2309 DSAT->getBracketsRange())->getCanonicalTypeInternal()); 2310 2311 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2312 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2313 VAT->getSizeExpr() ? 2314 VAT->getSizeExpr()->Retain() : 0, 2315 VAT->getSizeModifier(), 2316 VAT->getIndexTypeCVRQualifiers(), 2317 VAT->getBracketsRange())); 2318} 2319 2320TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2321 // If this template name refers to a template, the canonical 2322 // template name merely stores the template itself. 2323 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2324 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2325 2326 // If this template name refers to a set of overloaded function templates, 2327 /// the canonical template name merely stores the set of function templates. 2328 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) { 2329 OverloadedFunctionDecl *CanonOvl = 0; 2330 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 2331 FEnd = Ovl->function_end(); 2332 F != FEnd; ++F) { 2333 Decl *Canon = F->get()->getCanonicalDecl(); 2334 if (CanonOvl || Canon != F->get()) { 2335 if (!CanonOvl) 2336 CanonOvl = OverloadedFunctionDecl::Create(*this, 2337 Ovl->getDeclContext(), 2338 Ovl->getDeclName()); 2339 2340 CanonOvl->addOverload( 2341 AnyFunctionDecl::getFromNamedDecl(cast<NamedDecl>(Canon))); 2342 } 2343 } 2344 2345 return TemplateName(CanonOvl? CanonOvl : Ovl); 2346 } 2347 2348 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2349 assert(DTN && "Non-dependent template names must refer to template decls."); 2350 return DTN->CanonicalTemplateName; 2351} 2352 2353TemplateArgument 2354ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2355 switch (Arg.getKind()) { 2356 case TemplateArgument::Null: 2357 return Arg; 2358 2359 case TemplateArgument::Expression: 2360 // FIXME: Build canonical expression? 2361 return Arg; 2362 2363 case TemplateArgument::Declaration: 2364 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2365 2366 case TemplateArgument::Integral: 2367 return TemplateArgument(*Arg.getAsIntegral(), 2368 getCanonicalType(Arg.getIntegralType())); 2369 2370 case TemplateArgument::Type: 2371 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2372 2373 case TemplateArgument::Pack: { 2374 // FIXME: Allocate in ASTContext 2375 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2376 unsigned Idx = 0; 2377 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2378 AEnd = Arg.pack_end(); 2379 A != AEnd; (void)++A, ++Idx) 2380 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2381 2382 TemplateArgument Result; 2383 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2384 return Result; 2385 } 2386 } 2387 2388 // Silence GCC warning 2389 assert(false && "Unhandled template argument kind"); 2390 return TemplateArgument(); 2391} 2392 2393NestedNameSpecifier * 2394ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2395 if (!NNS) 2396 return 0; 2397 2398 switch (NNS->getKind()) { 2399 case NestedNameSpecifier::Identifier: 2400 // Canonicalize the prefix but keep the identifier the same. 2401 return NestedNameSpecifier::Create(*this, 2402 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2403 NNS->getAsIdentifier()); 2404 2405 case NestedNameSpecifier::Namespace: 2406 // A namespace is canonical; build a nested-name-specifier with 2407 // this namespace and no prefix. 2408 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2409 2410 case NestedNameSpecifier::TypeSpec: 2411 case NestedNameSpecifier::TypeSpecWithTemplate: { 2412 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2413 return NestedNameSpecifier::Create(*this, 0, 2414 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2415 T.getTypePtr()); 2416 } 2417 2418 case NestedNameSpecifier::Global: 2419 // The global specifier is canonical and unique. 2420 return NNS; 2421 } 2422 2423 // Required to silence a GCC warning 2424 return 0; 2425} 2426 2427 2428const ArrayType *ASTContext::getAsArrayType(QualType T) { 2429 // Handle the non-qualified case efficiently. 2430 if (!T.hasQualifiers()) { 2431 // Handle the common positive case fast. 2432 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2433 return AT; 2434 } 2435 2436 // Handle the common negative case fast. 2437 QualType CType = T->getCanonicalTypeInternal(); 2438 if (!isa<ArrayType>(CType)) 2439 return 0; 2440 2441 // Apply any qualifiers from the array type to the element type. This 2442 // implements C99 6.7.3p8: "If the specification of an array type includes 2443 // any type qualifiers, the element type is so qualified, not the array type." 2444 2445 // If we get here, we either have type qualifiers on the type, or we have 2446 // sugar such as a typedef in the way. If we have type qualifiers on the type 2447 // we must propagate them down into the element type. 2448 2449 QualifierCollector Qs; 2450 const Type *Ty = Qs.strip(T.getDesugaredType()); 2451 2452 // If we have a simple case, just return now. 2453 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2454 if (ATy == 0 || Qs.empty()) 2455 return ATy; 2456 2457 // Otherwise, we have an array and we have qualifiers on it. Push the 2458 // qualifiers into the array element type and return a new array type. 2459 // Get the canonical version of the element with the extra qualifiers on it. 2460 // This can recursively sink qualifiers through multiple levels of arrays. 2461 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2462 2463 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2464 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2465 CAT->getSizeModifier(), 2466 CAT->getIndexTypeCVRQualifiers())); 2467 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2468 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2469 IAT->getSizeModifier(), 2470 IAT->getIndexTypeCVRQualifiers())); 2471 2472 if (const DependentSizedArrayType *DSAT 2473 = dyn_cast<DependentSizedArrayType>(ATy)) 2474 return cast<ArrayType>( 2475 getDependentSizedArrayType(NewEltTy, 2476 DSAT->getSizeExpr() ? 2477 DSAT->getSizeExpr()->Retain() : 0, 2478 DSAT->getSizeModifier(), 2479 DSAT->getIndexTypeCVRQualifiers(), 2480 DSAT->getBracketsRange())); 2481 2482 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2483 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2484 VAT->getSizeExpr() ? 2485 VAT->getSizeExpr()->Retain() : 0, 2486 VAT->getSizeModifier(), 2487 VAT->getIndexTypeCVRQualifiers(), 2488 VAT->getBracketsRange())); 2489} 2490 2491 2492/// getArrayDecayedType - Return the properly qualified result of decaying the 2493/// specified array type to a pointer. This operation is non-trivial when 2494/// handling typedefs etc. The canonical type of "T" must be an array type, 2495/// this returns a pointer to a properly qualified element of the array. 2496/// 2497/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2498QualType ASTContext::getArrayDecayedType(QualType Ty) { 2499 // Get the element type with 'getAsArrayType' so that we don't lose any 2500 // typedefs in the element type of the array. This also handles propagation 2501 // of type qualifiers from the array type into the element type if present 2502 // (C99 6.7.3p8). 2503 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2504 assert(PrettyArrayType && "Not an array type!"); 2505 2506 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2507 2508 // int x[restrict 4] -> int *restrict 2509 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2510} 2511 2512QualType ASTContext::getBaseElementType(QualType QT) { 2513 QualifierCollector Qs; 2514 while (true) { 2515 const Type *UT = Qs.strip(QT); 2516 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2517 QT = AT->getElementType(); 2518 } else { 2519 return Qs.apply(QT); 2520 } 2521 } 2522} 2523 2524QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2525 QualType ElemTy = AT->getElementType(); 2526 2527 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2528 return getBaseElementType(AT); 2529 2530 return ElemTy; 2531} 2532 2533/// getConstantArrayElementCount - Returns number of constant array elements. 2534uint64_t 2535ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2536 uint64_t ElementCount = 1; 2537 do { 2538 ElementCount *= CA->getSize().getZExtValue(); 2539 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2540 } while (CA); 2541 return ElementCount; 2542} 2543 2544/// getFloatingRank - Return a relative rank for floating point types. 2545/// This routine will assert if passed a built-in type that isn't a float. 2546static FloatingRank getFloatingRank(QualType T) { 2547 if (const ComplexType *CT = T->getAs<ComplexType>()) 2548 return getFloatingRank(CT->getElementType()); 2549 2550 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2551 switch (T->getAs<BuiltinType>()->getKind()) { 2552 default: assert(0 && "getFloatingRank(): not a floating type"); 2553 case BuiltinType::Float: return FloatRank; 2554 case BuiltinType::Double: return DoubleRank; 2555 case BuiltinType::LongDouble: return LongDoubleRank; 2556 } 2557} 2558 2559/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2560/// point or a complex type (based on typeDomain/typeSize). 2561/// 'typeDomain' is a real floating point or complex type. 2562/// 'typeSize' is a real floating point or complex type. 2563QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2564 QualType Domain) const { 2565 FloatingRank EltRank = getFloatingRank(Size); 2566 if (Domain->isComplexType()) { 2567 switch (EltRank) { 2568 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2569 case FloatRank: return FloatComplexTy; 2570 case DoubleRank: return DoubleComplexTy; 2571 case LongDoubleRank: return LongDoubleComplexTy; 2572 } 2573 } 2574 2575 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2576 switch (EltRank) { 2577 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2578 case FloatRank: return FloatTy; 2579 case DoubleRank: return DoubleTy; 2580 case LongDoubleRank: return LongDoubleTy; 2581 } 2582} 2583 2584/// getFloatingTypeOrder - Compare the rank of the two specified floating 2585/// point types, ignoring the domain of the type (i.e. 'double' == 2586/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2587/// LHS < RHS, return -1. 2588int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2589 FloatingRank LHSR = getFloatingRank(LHS); 2590 FloatingRank RHSR = getFloatingRank(RHS); 2591 2592 if (LHSR == RHSR) 2593 return 0; 2594 if (LHSR > RHSR) 2595 return 1; 2596 return -1; 2597} 2598 2599/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2600/// routine will assert if passed a built-in type that isn't an integer or enum, 2601/// or if it is not canonicalized. 2602unsigned ASTContext::getIntegerRank(Type *T) { 2603 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 2604 if (EnumType* ET = dyn_cast<EnumType>(T)) 2605 T = ET->getDecl()->getIntegerType().getTypePtr(); 2606 2607 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2608 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2609 2610 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2611 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2612 2613 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2614 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2615 2616 // There are two things which impact the integer rank: the width, and 2617 // the ordering of builtins. The builtin ordering is encoded in the 2618 // bottom three bits; the width is encoded in the bits above that. 2619 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2620 return FWIT->getWidth() << 3; 2621 2622 switch (cast<BuiltinType>(T)->getKind()) { 2623 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2624 case BuiltinType::Bool: 2625 return 1 + (getIntWidth(BoolTy) << 3); 2626 case BuiltinType::Char_S: 2627 case BuiltinType::Char_U: 2628 case BuiltinType::SChar: 2629 case BuiltinType::UChar: 2630 return 2 + (getIntWidth(CharTy) << 3); 2631 case BuiltinType::Short: 2632 case BuiltinType::UShort: 2633 return 3 + (getIntWidth(ShortTy) << 3); 2634 case BuiltinType::Int: 2635 case BuiltinType::UInt: 2636 return 4 + (getIntWidth(IntTy) << 3); 2637 case BuiltinType::Long: 2638 case BuiltinType::ULong: 2639 return 5 + (getIntWidth(LongTy) << 3); 2640 case BuiltinType::LongLong: 2641 case BuiltinType::ULongLong: 2642 return 6 + (getIntWidth(LongLongTy) << 3); 2643 case BuiltinType::Int128: 2644 case BuiltinType::UInt128: 2645 return 7 + (getIntWidth(Int128Ty) << 3); 2646 } 2647} 2648 2649/// \brief Whether this is a promotable bitfield reference according 2650/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2651/// 2652/// \returns the type this bit-field will promote to, or NULL if no 2653/// promotion occurs. 2654QualType ASTContext::isPromotableBitField(Expr *E) { 2655 FieldDecl *Field = E->getBitField(); 2656 if (!Field) 2657 return QualType(); 2658 2659 QualType FT = Field->getType(); 2660 2661 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2662 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2663 uint64_t IntSize = getTypeSize(IntTy); 2664 // GCC extension compatibility: if the bit-field size is less than or equal 2665 // to the size of int, it gets promoted no matter what its type is. 2666 // For instance, unsigned long bf : 4 gets promoted to signed int. 2667 if (BitWidth < IntSize) 2668 return IntTy; 2669 2670 if (BitWidth == IntSize) 2671 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2672 2673 // Types bigger than int are not subject to promotions, and therefore act 2674 // like the base type. 2675 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2676 // is ridiculous. 2677 return QualType(); 2678} 2679 2680/// getPromotedIntegerType - Returns the type that Promotable will 2681/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2682/// integer type. 2683QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2684 assert(!Promotable.isNull()); 2685 assert(Promotable->isPromotableIntegerType()); 2686 if (Promotable->isSignedIntegerType()) 2687 return IntTy; 2688 uint64_t PromotableSize = getTypeSize(Promotable); 2689 uint64_t IntSize = getTypeSize(IntTy); 2690 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2691 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2692} 2693 2694/// getIntegerTypeOrder - Returns the highest ranked integer type: 2695/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2696/// LHS < RHS, return -1. 2697int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2698 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2699 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2700 if (LHSC == RHSC) return 0; 2701 2702 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2703 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2704 2705 unsigned LHSRank = getIntegerRank(LHSC); 2706 unsigned RHSRank = getIntegerRank(RHSC); 2707 2708 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2709 if (LHSRank == RHSRank) return 0; 2710 return LHSRank > RHSRank ? 1 : -1; 2711 } 2712 2713 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2714 if (LHSUnsigned) { 2715 // If the unsigned [LHS] type is larger, return it. 2716 if (LHSRank >= RHSRank) 2717 return 1; 2718 2719 // If the signed type can represent all values of the unsigned type, it 2720 // wins. Because we are dealing with 2's complement and types that are 2721 // powers of two larger than each other, this is always safe. 2722 return -1; 2723 } 2724 2725 // If the unsigned [RHS] type is larger, return it. 2726 if (RHSRank >= LHSRank) 2727 return -1; 2728 2729 // If the signed type can represent all values of the unsigned type, it 2730 // wins. Because we are dealing with 2's complement and types that are 2731 // powers of two larger than each other, this is always safe. 2732 return 1; 2733} 2734 2735// getCFConstantStringType - Return the type used for constant CFStrings. 2736QualType ASTContext::getCFConstantStringType() { 2737 if (!CFConstantStringTypeDecl) { 2738 CFConstantStringTypeDecl = 2739 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2740 &Idents.get("NSConstantString")); 2741 QualType FieldTypes[4]; 2742 2743 // const int *isa; 2744 FieldTypes[0] = getPointerType(IntTy.withConst()); 2745 // int flags; 2746 FieldTypes[1] = IntTy; 2747 // const char *str; 2748 FieldTypes[2] = getPointerType(CharTy.withConst()); 2749 // long length; 2750 FieldTypes[3] = LongTy; 2751 2752 // Create fields 2753 for (unsigned i = 0; i < 4; ++i) { 2754 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2755 SourceLocation(), 0, 2756 FieldTypes[i], /*DInfo=*/0, 2757 /*BitWidth=*/0, 2758 /*Mutable=*/false); 2759 CFConstantStringTypeDecl->addDecl(Field); 2760 } 2761 2762 CFConstantStringTypeDecl->completeDefinition(*this); 2763 } 2764 2765 return getTagDeclType(CFConstantStringTypeDecl); 2766} 2767 2768void ASTContext::setCFConstantStringType(QualType T) { 2769 const RecordType *Rec = T->getAs<RecordType>(); 2770 assert(Rec && "Invalid CFConstantStringType"); 2771 CFConstantStringTypeDecl = Rec->getDecl(); 2772} 2773 2774QualType ASTContext::getObjCFastEnumerationStateType() { 2775 if (!ObjCFastEnumerationStateTypeDecl) { 2776 ObjCFastEnumerationStateTypeDecl = 2777 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2778 &Idents.get("__objcFastEnumerationState")); 2779 2780 QualType FieldTypes[] = { 2781 UnsignedLongTy, 2782 getPointerType(ObjCIdTypedefType), 2783 getPointerType(UnsignedLongTy), 2784 getConstantArrayType(UnsignedLongTy, 2785 llvm::APInt(32, 5), ArrayType::Normal, 0) 2786 }; 2787 2788 for (size_t i = 0; i < 4; ++i) { 2789 FieldDecl *Field = FieldDecl::Create(*this, 2790 ObjCFastEnumerationStateTypeDecl, 2791 SourceLocation(), 0, 2792 FieldTypes[i], /*DInfo=*/0, 2793 /*BitWidth=*/0, 2794 /*Mutable=*/false); 2795 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2796 } 2797 2798 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2799 } 2800 2801 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2802} 2803 2804QualType ASTContext::getBlockDescriptorType() { 2805 if (BlockDescriptorType) 2806 return getTagDeclType(BlockDescriptorType); 2807 2808 RecordDecl *T; 2809 // FIXME: Needs the FlagAppleBlock bit. 2810 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2811 &Idents.get("__block_descriptor")); 2812 2813 QualType FieldTypes[] = { 2814 UnsignedLongTy, 2815 UnsignedLongTy, 2816 }; 2817 2818 const char *FieldNames[] = { 2819 "reserved", 2820 "Size" 2821 }; 2822 2823 for (size_t i = 0; i < 2; ++i) { 2824 FieldDecl *Field = FieldDecl::Create(*this, 2825 T, 2826 SourceLocation(), 2827 &Idents.get(FieldNames[i]), 2828 FieldTypes[i], /*DInfo=*/0, 2829 /*BitWidth=*/0, 2830 /*Mutable=*/false); 2831 T->addDecl(Field); 2832 } 2833 2834 T->completeDefinition(*this); 2835 2836 BlockDescriptorType = T; 2837 2838 return getTagDeclType(BlockDescriptorType); 2839} 2840 2841void ASTContext::setBlockDescriptorType(QualType T) { 2842 const RecordType *Rec = T->getAs<RecordType>(); 2843 assert(Rec && "Invalid BlockDescriptorType"); 2844 BlockDescriptorType = Rec->getDecl(); 2845} 2846 2847QualType ASTContext::getBlockDescriptorExtendedType() { 2848 if (BlockDescriptorExtendedType) 2849 return getTagDeclType(BlockDescriptorExtendedType); 2850 2851 RecordDecl *T; 2852 // FIXME: Needs the FlagAppleBlock bit. 2853 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2854 &Idents.get("__block_descriptor_withcopydispose")); 2855 2856 QualType FieldTypes[] = { 2857 UnsignedLongTy, 2858 UnsignedLongTy, 2859 getPointerType(VoidPtrTy), 2860 getPointerType(VoidPtrTy) 2861 }; 2862 2863 const char *FieldNames[] = { 2864 "reserved", 2865 "Size", 2866 "CopyFuncPtr", 2867 "DestroyFuncPtr" 2868 }; 2869 2870 for (size_t i = 0; i < 4; ++i) { 2871 FieldDecl *Field = FieldDecl::Create(*this, 2872 T, 2873 SourceLocation(), 2874 &Idents.get(FieldNames[i]), 2875 FieldTypes[i], /*DInfo=*/0, 2876 /*BitWidth=*/0, 2877 /*Mutable=*/false); 2878 T->addDecl(Field); 2879 } 2880 2881 T->completeDefinition(*this); 2882 2883 BlockDescriptorExtendedType = T; 2884 2885 return getTagDeclType(BlockDescriptorExtendedType); 2886} 2887 2888void ASTContext::setBlockDescriptorExtendedType(QualType T) { 2889 const RecordType *Rec = T->getAs<RecordType>(); 2890 assert(Rec && "Invalid BlockDescriptorType"); 2891 BlockDescriptorExtendedType = Rec->getDecl(); 2892} 2893 2894bool ASTContext::BlockRequiresCopying(QualType Ty) { 2895 if (Ty->isBlockPointerType()) 2896 return true; 2897 if (isObjCNSObjectType(Ty)) 2898 return true; 2899 if (Ty->isObjCObjectPointerType()) 2900 return true; 2901 return false; 2902} 2903 2904QualType ASTContext::BuildByRefType(const char *DeclName, QualType Ty) { 2905 // type = struct __Block_byref_1_X { 2906 // void *__isa; 2907 // struct __Block_byref_1_X *__forwarding; 2908 // unsigned int __flags; 2909 // unsigned int __size; 2910 // void *__copy_helper; // as needed 2911 // void *__destroy_help // as needed 2912 // int X; 2913 // } * 2914 2915 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 2916 2917 // FIXME: Move up 2918 static unsigned int UniqueBlockByRefTypeID = 0; 2919 llvm::SmallString<36> Name; 2920 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 2921 ++UniqueBlockByRefTypeID << '_' << DeclName; 2922 RecordDecl *T; 2923 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2924 &Idents.get(Name.str())); 2925 T->startDefinition(); 2926 QualType Int32Ty = IntTy; 2927 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 2928 QualType FieldTypes[] = { 2929 getPointerType(VoidPtrTy), 2930 getPointerType(getTagDeclType(T)), 2931 Int32Ty, 2932 Int32Ty, 2933 getPointerType(VoidPtrTy), 2934 getPointerType(VoidPtrTy), 2935 Ty 2936 }; 2937 2938 const char *FieldNames[] = { 2939 "__isa", 2940 "__forwarding", 2941 "__flags", 2942 "__size", 2943 "__copy_helper", 2944 "__destroy_helper", 2945 DeclName, 2946 }; 2947 2948 for (size_t i = 0; i < 7; ++i) { 2949 if (!HasCopyAndDispose && i >=4 && i <= 5) 2950 continue; 2951 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2952 &Idents.get(FieldNames[i]), 2953 FieldTypes[i], /*DInfo=*/0, 2954 /*BitWidth=*/0, /*Mutable=*/false); 2955 T->addDecl(Field); 2956 } 2957 2958 T->completeDefinition(*this); 2959 2960 return getPointerType(getTagDeclType(T)); 2961} 2962 2963 2964QualType ASTContext::getBlockParmType( 2965 bool BlockHasCopyDispose, 2966 llvm::SmallVector<const Expr *, 8> &BlockDeclRefDecls) { 2967 // FIXME: Move up 2968 static unsigned int UniqueBlockParmTypeID = 0; 2969 llvm::SmallString<36> Name; 2970 llvm::raw_svector_ostream(Name) << "__block_literal_" 2971 << ++UniqueBlockParmTypeID; 2972 RecordDecl *T; 2973 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2974 &Idents.get(Name.str())); 2975 QualType FieldTypes[] = { 2976 getPointerType(VoidPtrTy), 2977 IntTy, 2978 IntTy, 2979 getPointerType(VoidPtrTy), 2980 (BlockHasCopyDispose ? 2981 getPointerType(getBlockDescriptorExtendedType()) : 2982 getPointerType(getBlockDescriptorType())) 2983 }; 2984 2985 const char *FieldNames[] = { 2986 "__isa", 2987 "__flags", 2988 "__reserved", 2989 "__FuncPtr", 2990 "__descriptor" 2991 }; 2992 2993 for (size_t i = 0; i < 5; ++i) { 2994 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2995 &Idents.get(FieldNames[i]), 2996 FieldTypes[i], /*DInfo=*/0, 2997 /*BitWidth=*/0, /*Mutable=*/false); 2998 T->addDecl(Field); 2999 } 3000 3001 for (size_t i = 0; i < BlockDeclRefDecls.size(); ++i) { 3002 const Expr *E = BlockDeclRefDecls[i]; 3003 const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); 3004 clang::IdentifierInfo *Name = 0; 3005 if (BDRE) { 3006 const ValueDecl *D = BDRE->getDecl(); 3007 Name = &Idents.get(D->getName()); 3008 } 3009 QualType FieldType = E->getType(); 3010 3011 if (BDRE && BDRE->isByRef()) 3012 FieldType = BuildByRefType(BDRE->getDecl()->getNameAsCString(), 3013 FieldType); 3014 3015 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3016 Name, FieldType, /*DInfo=*/0, 3017 /*BitWidth=*/0, /*Mutable=*/false); 3018 T->addDecl(Field); 3019 } 3020 3021 T->completeDefinition(*this); 3022 3023 return getPointerType(getTagDeclType(T)); 3024} 3025 3026void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3027 const RecordType *Rec = T->getAs<RecordType>(); 3028 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3029 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3030} 3031 3032// This returns true if a type has been typedefed to BOOL: 3033// typedef <type> BOOL; 3034static bool isTypeTypedefedAsBOOL(QualType T) { 3035 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3036 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3037 return II->isStr("BOOL"); 3038 3039 return false; 3040} 3041 3042/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3043/// purpose. 3044int ASTContext::getObjCEncodingTypeSize(QualType type) { 3045 uint64_t sz = getTypeSize(type); 3046 3047 // Make all integer and enum types at least as large as an int 3048 if (sz > 0 && type->isIntegralType()) 3049 sz = std::max(sz, getTypeSize(IntTy)); 3050 // Treat arrays as pointers, since that's how they're passed in. 3051 else if (type->isArrayType()) 3052 sz = getTypeSize(VoidPtrTy); 3053 return sz / getTypeSize(CharTy); 3054} 3055 3056/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3057/// declaration. 3058void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3059 std::string& S) { 3060 // FIXME: This is not very efficient. 3061 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3062 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3063 // Encode result type. 3064 getObjCEncodingForType(Decl->getResultType(), S); 3065 // Compute size of all parameters. 3066 // Start with computing size of a pointer in number of bytes. 3067 // FIXME: There might(should) be a better way of doing this computation! 3068 SourceLocation Loc; 3069 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 3070 // The first two arguments (self and _cmd) are pointers; account for 3071 // their size. 3072 int ParmOffset = 2 * PtrSize; 3073 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3074 E = Decl->param_end(); PI != E; ++PI) { 3075 QualType PType = (*PI)->getType(); 3076 int sz = getObjCEncodingTypeSize(PType); 3077 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 3078 ParmOffset += sz; 3079 } 3080 S += llvm::utostr(ParmOffset); 3081 S += "@0:"; 3082 S += llvm::utostr(PtrSize); 3083 3084 // Argument types. 3085 ParmOffset = 2 * PtrSize; 3086 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3087 E = Decl->param_end(); PI != E; ++PI) { 3088 ParmVarDecl *PVDecl = *PI; 3089 QualType PType = PVDecl->getOriginalType(); 3090 if (const ArrayType *AT = 3091 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3092 // Use array's original type only if it has known number of 3093 // elements. 3094 if (!isa<ConstantArrayType>(AT)) 3095 PType = PVDecl->getType(); 3096 } else if (PType->isFunctionType()) 3097 PType = PVDecl->getType(); 3098 // Process argument qualifiers for user supplied arguments; such as, 3099 // 'in', 'inout', etc. 3100 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3101 getObjCEncodingForType(PType, S); 3102 S += llvm::utostr(ParmOffset); 3103 ParmOffset += getObjCEncodingTypeSize(PType); 3104 } 3105} 3106 3107/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3108/// property declaration. If non-NULL, Container must be either an 3109/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3110/// NULL when getting encodings for protocol properties. 3111/// Property attributes are stored as a comma-delimited C string. The simple 3112/// attributes readonly and bycopy are encoded as single characters. The 3113/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3114/// encoded as single characters, followed by an identifier. Property types 3115/// are also encoded as a parametrized attribute. The characters used to encode 3116/// these attributes are defined by the following enumeration: 3117/// @code 3118/// enum PropertyAttributes { 3119/// kPropertyReadOnly = 'R', // property is read-only. 3120/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3121/// kPropertyByref = '&', // property is a reference to the value last assigned 3122/// kPropertyDynamic = 'D', // property is dynamic 3123/// kPropertyGetter = 'G', // followed by getter selector name 3124/// kPropertySetter = 'S', // followed by setter selector name 3125/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3126/// kPropertyType = 't' // followed by old-style type encoding. 3127/// kPropertyWeak = 'W' // 'weak' property 3128/// kPropertyStrong = 'P' // property GC'able 3129/// kPropertyNonAtomic = 'N' // property non-atomic 3130/// }; 3131/// @endcode 3132void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3133 const Decl *Container, 3134 std::string& S) { 3135 // Collect information from the property implementation decl(s). 3136 bool Dynamic = false; 3137 ObjCPropertyImplDecl *SynthesizePID = 0; 3138 3139 // FIXME: Duplicated code due to poor abstraction. 3140 if (Container) { 3141 if (const ObjCCategoryImplDecl *CID = 3142 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3143 for (ObjCCategoryImplDecl::propimpl_iterator 3144 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3145 i != e; ++i) { 3146 ObjCPropertyImplDecl *PID = *i; 3147 if (PID->getPropertyDecl() == PD) { 3148 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3149 Dynamic = true; 3150 } else { 3151 SynthesizePID = PID; 3152 } 3153 } 3154 } 3155 } else { 3156 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3157 for (ObjCCategoryImplDecl::propimpl_iterator 3158 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3159 i != e; ++i) { 3160 ObjCPropertyImplDecl *PID = *i; 3161 if (PID->getPropertyDecl() == PD) { 3162 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3163 Dynamic = true; 3164 } else { 3165 SynthesizePID = PID; 3166 } 3167 } 3168 } 3169 } 3170 } 3171 3172 // FIXME: This is not very efficient. 3173 S = "T"; 3174 3175 // Encode result type. 3176 // GCC has some special rules regarding encoding of properties which 3177 // closely resembles encoding of ivars. 3178 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3179 true /* outermost type */, 3180 true /* encoding for property */); 3181 3182 if (PD->isReadOnly()) { 3183 S += ",R"; 3184 } else { 3185 switch (PD->getSetterKind()) { 3186 case ObjCPropertyDecl::Assign: break; 3187 case ObjCPropertyDecl::Copy: S += ",C"; break; 3188 case ObjCPropertyDecl::Retain: S += ",&"; break; 3189 } 3190 } 3191 3192 // It really isn't clear at all what this means, since properties 3193 // are "dynamic by default". 3194 if (Dynamic) 3195 S += ",D"; 3196 3197 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3198 S += ",N"; 3199 3200 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3201 S += ",G"; 3202 S += PD->getGetterName().getAsString(); 3203 } 3204 3205 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3206 S += ",S"; 3207 S += PD->getSetterName().getAsString(); 3208 } 3209 3210 if (SynthesizePID) { 3211 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3212 S += ",V"; 3213 S += OID->getNameAsString(); 3214 } 3215 3216 // FIXME: OBJCGC: weak & strong 3217} 3218 3219/// getLegacyIntegralTypeEncoding - 3220/// Another legacy compatibility encoding: 32-bit longs are encoded as 3221/// 'l' or 'L' , but not always. For typedefs, we need to use 3222/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3223/// 3224void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3225 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3226 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3227 if (BT->getKind() == BuiltinType::ULong && 3228 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3229 PointeeTy = UnsignedIntTy; 3230 else 3231 if (BT->getKind() == BuiltinType::Long && 3232 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3233 PointeeTy = IntTy; 3234 } 3235 } 3236} 3237 3238void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3239 const FieldDecl *Field) { 3240 // We follow the behavior of gcc, expanding structures which are 3241 // directly pointed to, and expanding embedded structures. Note that 3242 // these rules are sufficient to prevent recursive encoding of the 3243 // same type. 3244 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3245 true /* outermost type */); 3246} 3247 3248static void EncodeBitField(const ASTContext *Context, std::string& S, 3249 const FieldDecl *FD) { 3250 const Expr *E = FD->getBitWidth(); 3251 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3252 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3253 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3254 S += 'b'; 3255 S += llvm::utostr(N); 3256} 3257 3258// FIXME: Use SmallString for accumulating string. 3259void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3260 bool ExpandPointedToStructures, 3261 bool ExpandStructures, 3262 const FieldDecl *FD, 3263 bool OutermostType, 3264 bool EncodingProperty) { 3265 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3266 if (FD && FD->isBitField()) 3267 return EncodeBitField(this, S, FD); 3268 char encoding; 3269 switch (BT->getKind()) { 3270 default: assert(0 && "Unhandled builtin type kind"); 3271 case BuiltinType::Void: encoding = 'v'; break; 3272 case BuiltinType::Bool: encoding = 'B'; break; 3273 case BuiltinType::Char_U: 3274 case BuiltinType::UChar: encoding = 'C'; break; 3275 case BuiltinType::UShort: encoding = 'S'; break; 3276 case BuiltinType::UInt: encoding = 'I'; break; 3277 case BuiltinType::ULong: 3278 encoding = 3279 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3280 break; 3281 case BuiltinType::UInt128: encoding = 'T'; break; 3282 case BuiltinType::ULongLong: encoding = 'Q'; break; 3283 case BuiltinType::Char_S: 3284 case BuiltinType::SChar: encoding = 'c'; break; 3285 case BuiltinType::Short: encoding = 's'; break; 3286 case BuiltinType::Int: encoding = 'i'; break; 3287 case BuiltinType::Long: 3288 encoding = 3289 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3290 break; 3291 case BuiltinType::LongLong: encoding = 'q'; break; 3292 case BuiltinType::Int128: encoding = 't'; break; 3293 case BuiltinType::Float: encoding = 'f'; break; 3294 case BuiltinType::Double: encoding = 'd'; break; 3295 case BuiltinType::LongDouble: encoding = 'd'; break; 3296 } 3297 3298 S += encoding; 3299 return; 3300 } 3301 3302 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3303 S += 'j'; 3304 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3305 false); 3306 return; 3307 } 3308 3309 if (const PointerType *PT = T->getAs<PointerType>()) { 3310 QualType PointeeTy = PT->getPointeeType(); 3311 bool isReadOnly = false; 3312 // For historical/compatibility reasons, the read-only qualifier of the 3313 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3314 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3315 // Also, do not emit the 'r' for anything but the outermost type! 3316 if (isa<TypedefType>(T.getTypePtr())) { 3317 if (OutermostType && T.isConstQualified()) { 3318 isReadOnly = true; 3319 S += 'r'; 3320 } 3321 } else if (OutermostType) { 3322 QualType P = PointeeTy; 3323 while (P->getAs<PointerType>()) 3324 P = P->getAs<PointerType>()->getPointeeType(); 3325 if (P.isConstQualified()) { 3326 isReadOnly = true; 3327 S += 'r'; 3328 } 3329 } 3330 if (isReadOnly) { 3331 // Another legacy compatibility encoding. Some ObjC qualifier and type 3332 // combinations need to be rearranged. 3333 // Rewrite "in const" from "nr" to "rn" 3334 const char * s = S.c_str(); 3335 int len = S.length(); 3336 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3337 std::string replace = "rn"; 3338 S.replace(S.end()-2, S.end(), replace); 3339 } 3340 } 3341 if (isObjCSelType(PointeeTy)) { 3342 S += ':'; 3343 return; 3344 } 3345 3346 if (PointeeTy->isCharType()) { 3347 // char pointer types should be encoded as '*' unless it is a 3348 // type that has been typedef'd to 'BOOL'. 3349 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3350 S += '*'; 3351 return; 3352 } 3353 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3354 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3355 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3356 S += '#'; 3357 return; 3358 } 3359 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3360 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3361 S += '@'; 3362 return; 3363 } 3364 // fall through... 3365 } 3366 S += '^'; 3367 getLegacyIntegralTypeEncoding(PointeeTy); 3368 3369 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3370 NULL); 3371 return; 3372 } 3373 3374 if (const ArrayType *AT = 3375 // Ignore type qualifiers etc. 3376 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3377 if (isa<IncompleteArrayType>(AT)) { 3378 // Incomplete arrays are encoded as a pointer to the array element. 3379 S += '^'; 3380 3381 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3382 false, ExpandStructures, FD); 3383 } else { 3384 S += '['; 3385 3386 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3387 S += llvm::utostr(CAT->getSize().getZExtValue()); 3388 else { 3389 //Variable length arrays are encoded as a regular array with 0 elements. 3390 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3391 S += '0'; 3392 } 3393 3394 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3395 false, ExpandStructures, FD); 3396 S += ']'; 3397 } 3398 return; 3399 } 3400 3401 if (T->getAs<FunctionType>()) { 3402 S += '?'; 3403 return; 3404 } 3405 3406 if (const RecordType *RTy = T->getAs<RecordType>()) { 3407 RecordDecl *RDecl = RTy->getDecl(); 3408 S += RDecl->isUnion() ? '(' : '{'; 3409 // Anonymous structures print as '?' 3410 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3411 S += II->getName(); 3412 } else { 3413 S += '?'; 3414 } 3415 if (ExpandStructures) { 3416 S += '='; 3417 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3418 FieldEnd = RDecl->field_end(); 3419 Field != FieldEnd; ++Field) { 3420 if (FD) { 3421 S += '"'; 3422 S += Field->getNameAsString(); 3423 S += '"'; 3424 } 3425 3426 // Special case bit-fields. 3427 if (Field->isBitField()) { 3428 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3429 (*Field)); 3430 } else { 3431 QualType qt = Field->getType(); 3432 getLegacyIntegralTypeEncoding(qt); 3433 getObjCEncodingForTypeImpl(qt, S, false, true, 3434 FD); 3435 } 3436 } 3437 } 3438 S += RDecl->isUnion() ? ')' : '}'; 3439 return; 3440 } 3441 3442 if (T->isEnumeralType()) { 3443 if (FD && FD->isBitField()) 3444 EncodeBitField(this, S, FD); 3445 else 3446 S += 'i'; 3447 return; 3448 } 3449 3450 if (T->isBlockPointerType()) { 3451 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3452 return; 3453 } 3454 3455 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3456 // @encode(class_name) 3457 ObjCInterfaceDecl *OI = OIT->getDecl(); 3458 S += '{'; 3459 const IdentifierInfo *II = OI->getIdentifier(); 3460 S += II->getName(); 3461 S += '='; 3462 llvm::SmallVector<FieldDecl*, 32> RecFields; 3463 CollectObjCIvars(OI, RecFields); 3464 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3465 if (RecFields[i]->isBitField()) 3466 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3467 RecFields[i]); 3468 else 3469 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3470 FD); 3471 } 3472 S += '}'; 3473 return; 3474 } 3475 3476 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3477 if (OPT->isObjCIdType()) { 3478 S += '@'; 3479 return; 3480 } 3481 3482 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 3483 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 3484 // Since this is a binary compatibility issue, need to consult with runtime 3485 // folks. Fortunately, this is a *very* obsure construct. 3486 S += '#'; 3487 return; 3488 } 3489 3490 if (OPT->isObjCQualifiedIdType()) { 3491 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3492 ExpandPointedToStructures, 3493 ExpandStructures, FD); 3494 if (FD || EncodingProperty) { 3495 // Note that we do extended encoding of protocol qualifer list 3496 // Only when doing ivar or property encoding. 3497 S += '"'; 3498 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3499 E = OPT->qual_end(); I != E; ++I) { 3500 S += '<'; 3501 S += (*I)->getNameAsString(); 3502 S += '>'; 3503 } 3504 S += '"'; 3505 } 3506 return; 3507 } 3508 3509 QualType PointeeTy = OPT->getPointeeType(); 3510 if (!EncodingProperty && 3511 isa<TypedefType>(PointeeTy.getTypePtr())) { 3512 // Another historical/compatibility reason. 3513 // We encode the underlying type which comes out as 3514 // {...}; 3515 S += '^'; 3516 getObjCEncodingForTypeImpl(PointeeTy, S, 3517 false, ExpandPointedToStructures, 3518 NULL); 3519 return; 3520 } 3521 3522 S += '@'; 3523 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 3524 S += '"'; 3525 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 3526 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3527 E = OPT->qual_end(); I != E; ++I) { 3528 S += '<'; 3529 S += (*I)->getNameAsString(); 3530 S += '>'; 3531 } 3532 S += '"'; 3533 } 3534 return; 3535 } 3536 3537 assert(0 && "@encode for type not implemented!"); 3538} 3539 3540void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3541 std::string& S) const { 3542 if (QT & Decl::OBJC_TQ_In) 3543 S += 'n'; 3544 if (QT & Decl::OBJC_TQ_Inout) 3545 S += 'N'; 3546 if (QT & Decl::OBJC_TQ_Out) 3547 S += 'o'; 3548 if (QT & Decl::OBJC_TQ_Bycopy) 3549 S += 'O'; 3550 if (QT & Decl::OBJC_TQ_Byref) 3551 S += 'R'; 3552 if (QT & Decl::OBJC_TQ_Oneway) 3553 S += 'V'; 3554} 3555 3556void ASTContext::setBuiltinVaListType(QualType T) { 3557 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3558 3559 BuiltinVaListType = T; 3560} 3561 3562void ASTContext::setObjCIdType(QualType T) { 3563 ObjCIdTypedefType = T; 3564} 3565 3566void ASTContext::setObjCSelType(QualType T) { 3567 ObjCSelType = T; 3568 3569 const TypedefType *TT = T->getAs<TypedefType>(); 3570 if (!TT) 3571 return; 3572 TypedefDecl *TD = TT->getDecl(); 3573 3574 // typedef struct objc_selector *SEL; 3575 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3576 if (!ptr) 3577 return; 3578 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3579 if (!rec) 3580 return; 3581 SelStructType = rec; 3582} 3583 3584void ASTContext::setObjCProtoType(QualType QT) { 3585 ObjCProtoType = QT; 3586} 3587 3588void ASTContext::setObjCClassType(QualType T) { 3589 ObjCClassTypedefType = T; 3590} 3591 3592void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3593 assert(ObjCConstantStringType.isNull() && 3594 "'NSConstantString' type already set!"); 3595 3596 ObjCConstantStringType = getObjCInterfaceType(Decl); 3597} 3598 3599/// \brief Retrieve the template name that represents a qualified 3600/// template name such as \c std::vector. 3601TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3602 bool TemplateKeyword, 3603 TemplateDecl *Template) { 3604 llvm::FoldingSetNodeID ID; 3605 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3606 3607 void *InsertPos = 0; 3608 QualifiedTemplateName *QTN = 3609 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3610 if (!QTN) { 3611 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3612 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3613 } 3614 3615 return TemplateName(QTN); 3616} 3617 3618/// \brief Retrieve the template name that represents a qualified 3619/// template name such as \c std::vector. 3620TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3621 bool TemplateKeyword, 3622 OverloadedFunctionDecl *Template) { 3623 llvm::FoldingSetNodeID ID; 3624 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3625 3626 void *InsertPos = 0; 3627 QualifiedTemplateName *QTN = 3628 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3629 if (!QTN) { 3630 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3631 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3632 } 3633 3634 return TemplateName(QTN); 3635} 3636 3637/// \brief Retrieve the template name that represents a dependent 3638/// template name such as \c MetaFun::template apply. 3639TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3640 const IdentifierInfo *Name) { 3641 assert((!NNS || NNS->isDependent()) && 3642 "Nested name specifier must be dependent"); 3643 3644 llvm::FoldingSetNodeID ID; 3645 DependentTemplateName::Profile(ID, NNS, Name); 3646 3647 void *InsertPos = 0; 3648 DependentTemplateName *QTN = 3649 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3650 3651 if (QTN) 3652 return TemplateName(QTN); 3653 3654 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3655 if (CanonNNS == NNS) { 3656 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3657 } else { 3658 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3659 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3660 } 3661 3662 DependentTemplateNames.InsertNode(QTN, InsertPos); 3663 return TemplateName(QTN); 3664} 3665 3666/// \brief Retrieve the template name that represents a dependent 3667/// template name such as \c MetaFun::template operator+. 3668TemplateName 3669ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3670 OverloadedOperatorKind Operator) { 3671 assert((!NNS || NNS->isDependent()) && 3672 "Nested name specifier must be dependent"); 3673 3674 llvm::FoldingSetNodeID ID; 3675 DependentTemplateName::Profile(ID, NNS, Operator); 3676 3677 void *InsertPos = 0; 3678 DependentTemplateName *QTN = 3679 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3680 3681 if (QTN) 3682 return TemplateName(QTN); 3683 3684 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3685 if (CanonNNS == NNS) { 3686 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 3687 } else { 3688 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 3689 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 3690 } 3691 3692 DependentTemplateNames.InsertNode(QTN, InsertPos); 3693 return TemplateName(QTN); 3694} 3695 3696/// getFromTargetType - Given one of the integer types provided by 3697/// TargetInfo, produce the corresponding type. The unsigned @p Type 3698/// is actually a value of type @c TargetInfo::IntType. 3699CanQualType ASTContext::getFromTargetType(unsigned Type) const { 3700 switch (Type) { 3701 case TargetInfo::NoInt: return CanQualType(); 3702 case TargetInfo::SignedShort: return ShortTy; 3703 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3704 case TargetInfo::SignedInt: return IntTy; 3705 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3706 case TargetInfo::SignedLong: return LongTy; 3707 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3708 case TargetInfo::SignedLongLong: return LongLongTy; 3709 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3710 } 3711 3712 assert(false && "Unhandled TargetInfo::IntType value"); 3713 return CanQualType(); 3714} 3715 3716//===----------------------------------------------------------------------===// 3717// Type Predicates. 3718//===----------------------------------------------------------------------===// 3719 3720/// isObjCNSObjectType - Return true if this is an NSObject object using 3721/// NSObject attribute on a c-style pointer type. 3722/// FIXME - Make it work directly on types. 3723/// FIXME: Move to Type. 3724/// 3725bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3726 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3727 if (TypedefDecl *TD = TDT->getDecl()) 3728 if (TD->getAttr<ObjCNSObjectAttr>()) 3729 return true; 3730 } 3731 return false; 3732} 3733 3734/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3735/// garbage collection attribute. 3736/// 3737Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3738 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3739 if (getLangOptions().ObjC1 && 3740 getLangOptions().getGCMode() != LangOptions::NonGC) { 3741 GCAttrs = Ty.getObjCGCAttr(); 3742 // Default behavious under objective-c's gc is for objective-c pointers 3743 // (or pointers to them) be treated as though they were declared 3744 // as __strong. 3745 if (GCAttrs == Qualifiers::GCNone) { 3746 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3747 GCAttrs = Qualifiers::Strong; 3748 else if (Ty->isPointerType()) 3749 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3750 } 3751 // Non-pointers have none gc'able attribute regardless of the attribute 3752 // set on them. 3753 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3754 return Qualifiers::GCNone; 3755 } 3756 return GCAttrs; 3757} 3758 3759//===----------------------------------------------------------------------===// 3760// Type Compatibility Testing 3761//===----------------------------------------------------------------------===// 3762 3763/// areCompatVectorTypes - Return true if the two specified vector types are 3764/// compatible. 3765static bool areCompatVectorTypes(const VectorType *LHS, 3766 const VectorType *RHS) { 3767 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 3768 return LHS->getElementType() == RHS->getElementType() && 3769 LHS->getNumElements() == RHS->getNumElements(); 3770} 3771 3772//===----------------------------------------------------------------------===// 3773// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3774//===----------------------------------------------------------------------===// 3775 3776/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3777/// inheritance hierarchy of 'rProto'. 3778bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3779 ObjCProtocolDecl *rProto) { 3780 if (lProto == rProto) 3781 return true; 3782 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3783 E = rProto->protocol_end(); PI != E; ++PI) 3784 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3785 return true; 3786 return false; 3787} 3788 3789/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3790/// return true if lhs's protocols conform to rhs's protocol; false 3791/// otherwise. 3792bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3793 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3794 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3795 return false; 3796} 3797 3798/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3799/// ObjCQualifiedIDType. 3800bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3801 bool compare) { 3802 // Allow id<P..> and an 'id' or void* type in all cases. 3803 if (lhs->isVoidPointerType() || 3804 lhs->isObjCIdType() || lhs->isObjCClassType()) 3805 return true; 3806 else if (rhs->isVoidPointerType() || 3807 rhs->isObjCIdType() || rhs->isObjCClassType()) 3808 return true; 3809 3810 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3811 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3812 3813 if (!rhsOPT) return false; 3814 3815 if (rhsOPT->qual_empty()) { 3816 // If the RHS is a unqualified interface pointer "NSString*", 3817 // make sure we check the class hierarchy. 3818 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3819 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3820 E = lhsQID->qual_end(); I != E; ++I) { 3821 // when comparing an id<P> on lhs with a static type on rhs, 3822 // see if static class implements all of id's protocols, directly or 3823 // through its super class and categories. 3824 if (!rhsID->ClassImplementsProtocol(*I, true)) 3825 return false; 3826 } 3827 } 3828 // If there are no qualifiers and no interface, we have an 'id'. 3829 return true; 3830 } 3831 // Both the right and left sides have qualifiers. 3832 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3833 E = lhsQID->qual_end(); I != E; ++I) { 3834 ObjCProtocolDecl *lhsProto = *I; 3835 bool match = false; 3836 3837 // when comparing an id<P> on lhs with a static type on rhs, 3838 // see if static class implements all of id's protocols, directly or 3839 // through its super class and categories. 3840 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3841 E = rhsOPT->qual_end(); J != E; ++J) { 3842 ObjCProtocolDecl *rhsProto = *J; 3843 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3844 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3845 match = true; 3846 break; 3847 } 3848 } 3849 // If the RHS is a qualified interface pointer "NSString<P>*", 3850 // make sure we check the class hierarchy. 3851 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3852 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3853 E = lhsQID->qual_end(); I != E; ++I) { 3854 // when comparing an id<P> on lhs with a static type on rhs, 3855 // see if static class implements all of id's protocols, directly or 3856 // through its super class and categories. 3857 if (rhsID->ClassImplementsProtocol(*I, true)) { 3858 match = true; 3859 break; 3860 } 3861 } 3862 } 3863 if (!match) 3864 return false; 3865 } 3866 3867 return true; 3868 } 3869 3870 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3871 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3872 3873 if (const ObjCObjectPointerType *lhsOPT = 3874 lhs->getAsObjCInterfacePointerType()) { 3875 if (lhsOPT->qual_empty()) { 3876 bool match = false; 3877 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3878 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3879 E = rhsQID->qual_end(); I != E; ++I) { 3880 // when comparing an id<P> on lhs with a static type on rhs, 3881 // see if static class implements all of id's protocols, directly or 3882 // through its super class and categories. 3883 if (lhsID->ClassImplementsProtocol(*I, true)) { 3884 match = true; 3885 break; 3886 } 3887 } 3888 if (!match) 3889 return false; 3890 } 3891 return true; 3892 } 3893 // Both the right and left sides have qualifiers. 3894 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3895 E = lhsOPT->qual_end(); I != E; ++I) { 3896 ObjCProtocolDecl *lhsProto = *I; 3897 bool match = false; 3898 3899 // when comparing an id<P> on lhs with a static type on rhs, 3900 // see if static class implements all of id's protocols, directly or 3901 // through its super class and categories. 3902 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3903 E = rhsQID->qual_end(); J != E; ++J) { 3904 ObjCProtocolDecl *rhsProto = *J; 3905 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3906 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3907 match = true; 3908 break; 3909 } 3910 } 3911 if (!match) 3912 return false; 3913 } 3914 return true; 3915 } 3916 return false; 3917} 3918 3919/// canAssignObjCInterfaces - Return true if the two interface types are 3920/// compatible for assignment from RHS to LHS. This handles validation of any 3921/// protocol qualifiers on the LHS or RHS. 3922/// 3923bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3924 const ObjCObjectPointerType *RHSOPT) { 3925 // If either type represents the built-in 'id' or 'Class' types, return true. 3926 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3927 return true; 3928 3929 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3930 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3931 QualType(RHSOPT,0), 3932 false); 3933 3934 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3935 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3936 if (LHS && RHS) // We have 2 user-defined types. 3937 return canAssignObjCInterfaces(LHS, RHS); 3938 3939 return false; 3940} 3941 3942/// getIntersectionOfProtocols - This routine finds the intersection of set 3943/// of protocols inherited from two distinct objective-c pointer objects. 3944/// It is used to build composite qualifier list of the composite type of 3945/// the conditional expression involving two objective-c pointer objects. 3946static 3947void getIntersectionOfProtocols(ASTContext &Context, 3948 const ObjCObjectPointerType *LHSOPT, 3949 const ObjCObjectPointerType *RHSOPT, 3950 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 3951 3952 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3953 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3954 3955 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 3956 unsigned LHSNumProtocols = LHS->getNumProtocols(); 3957 if (LHSNumProtocols > 0) 3958 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 3959 else { 3960 llvm::SmallVector<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 3961 Context.CollectInheritedProtocols(LHS->getDecl(), LHSInheritedProtocols); 3962 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 3963 LHSInheritedProtocols.end()); 3964 } 3965 3966 unsigned RHSNumProtocols = RHS->getNumProtocols(); 3967 if (RHSNumProtocols > 0) { 3968 ObjCProtocolDecl **RHSProtocols = (ObjCProtocolDecl **)RHS->qual_begin(); 3969 for (unsigned i = 0; i < RHSNumProtocols; ++i) 3970 if (InheritedProtocolSet.count(RHSProtocols[i])) 3971 IntersectionOfProtocols.push_back(RHSProtocols[i]); 3972 } 3973 else { 3974 llvm::SmallVector<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 3975 Context.CollectInheritedProtocols(RHS->getDecl(), RHSInheritedProtocols); 3976 // FIXME. This may cause duplication of protocols in the list, but should 3977 // be harmless. 3978 for (unsigned i = 0, len = RHSInheritedProtocols.size(); i < len; ++i) 3979 if (InheritedProtocolSet.count(RHSInheritedProtocols[i])) 3980 IntersectionOfProtocols.push_back(RHSInheritedProtocols[i]); 3981 } 3982} 3983 3984/// areCommonBaseCompatible - Returns common base class of the two classes if 3985/// one found. Note that this is O'2 algorithm. But it will be called as the 3986/// last type comparison in a ?-exp of ObjC pointer types before a 3987/// warning is issued. So, its invokation is extremely rare. 3988QualType ASTContext::areCommonBaseCompatible( 3989 const ObjCObjectPointerType *LHSOPT, 3990 const ObjCObjectPointerType *RHSOPT) { 3991 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3992 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3993 if (!LHS || !RHS) 3994 return QualType(); 3995 3996 while (const ObjCInterfaceDecl *LHSIDecl = LHS->getDecl()->getSuperClass()) { 3997 QualType LHSTy = getObjCInterfaceType(LHSIDecl); 3998 LHS = LHSTy->getAs<ObjCInterfaceType>(); 3999 if (canAssignObjCInterfaces(LHS, RHS)) { 4000 llvm::SmallVector<ObjCProtocolDecl *, 8> IntersectionOfProtocols; 4001 getIntersectionOfProtocols(*this, 4002 LHSOPT, RHSOPT, IntersectionOfProtocols); 4003 if (IntersectionOfProtocols.empty()) 4004 LHSTy = getObjCObjectPointerType(LHSTy); 4005 else 4006 LHSTy = getObjCObjectPointerType(LHSTy, &IntersectionOfProtocols[0], 4007 IntersectionOfProtocols.size()); 4008 return LHSTy; 4009 } 4010 } 4011 4012 return QualType(); 4013} 4014 4015bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 4016 const ObjCInterfaceType *RHS) { 4017 // Verify that the base decls are compatible: the RHS must be a subclass of 4018 // the LHS. 4019 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4020 return false; 4021 4022 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4023 // protocol qualified at all, then we are good. 4024 if (LHS->getNumProtocols() == 0) 4025 return true; 4026 4027 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4028 // isn't a superset. 4029 if (RHS->getNumProtocols() == 0) 4030 return true; // FIXME: should return false! 4031 4032 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 4033 LHSPE = LHS->qual_end(); 4034 LHSPI != LHSPE; LHSPI++) { 4035 bool RHSImplementsProtocol = false; 4036 4037 // If the RHS doesn't implement the protocol on the left, the types 4038 // are incompatible. 4039 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 4040 RHSPE = RHS->qual_end(); 4041 RHSPI != RHSPE; RHSPI++) { 4042 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4043 RHSImplementsProtocol = true; 4044 break; 4045 } 4046 } 4047 // FIXME: For better diagnostics, consider passing back the protocol name. 4048 if (!RHSImplementsProtocol) 4049 return false; 4050 } 4051 // The RHS implements all protocols listed on the LHS. 4052 return true; 4053} 4054 4055bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4056 // get the "pointed to" types 4057 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4058 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4059 4060 if (!LHSOPT || !RHSOPT) 4061 return false; 4062 4063 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4064 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4065} 4066 4067/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4068/// both shall have the identically qualified version of a compatible type. 4069/// C99 6.2.7p1: Two types have compatible types if their types are the 4070/// same. See 6.7.[2,3,5] for additional rules. 4071bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 4072 return !mergeTypes(LHS, RHS).isNull(); 4073} 4074 4075QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 4076 const FunctionType *lbase = lhs->getAs<FunctionType>(); 4077 const FunctionType *rbase = rhs->getAs<FunctionType>(); 4078 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 4079 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 4080 bool allLTypes = true; 4081 bool allRTypes = true; 4082 4083 // Check return type 4084 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 4085 if (retType.isNull()) return QualType(); 4086 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 4087 allLTypes = false; 4088 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 4089 allRTypes = false; 4090 // FIXME: double check this 4091 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 4092 if (NoReturn != lbase->getNoReturnAttr()) 4093 allLTypes = false; 4094 if (NoReturn != rbase->getNoReturnAttr()) 4095 allRTypes = false; 4096 4097 if (lproto && rproto) { // two C99 style function prototypes 4098 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 4099 "C++ shouldn't be here"); 4100 unsigned lproto_nargs = lproto->getNumArgs(); 4101 unsigned rproto_nargs = rproto->getNumArgs(); 4102 4103 // Compatible functions must have the same number of arguments 4104 if (lproto_nargs != rproto_nargs) 4105 return QualType(); 4106 4107 // Variadic and non-variadic functions aren't compatible 4108 if (lproto->isVariadic() != rproto->isVariadic()) 4109 return QualType(); 4110 4111 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 4112 return QualType(); 4113 4114 // Check argument compatibility 4115 llvm::SmallVector<QualType, 10> types; 4116 for (unsigned i = 0; i < lproto_nargs; i++) { 4117 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 4118 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 4119 QualType argtype = mergeTypes(largtype, rargtype); 4120 if (argtype.isNull()) return QualType(); 4121 types.push_back(argtype); 4122 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 4123 allLTypes = false; 4124 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 4125 allRTypes = false; 4126 } 4127 if (allLTypes) return lhs; 4128 if (allRTypes) return rhs; 4129 return getFunctionType(retType, types.begin(), types.size(), 4130 lproto->isVariadic(), lproto->getTypeQuals(), 4131 NoReturn); 4132 } 4133 4134 if (lproto) allRTypes = false; 4135 if (rproto) allLTypes = false; 4136 4137 const FunctionProtoType *proto = lproto ? lproto : rproto; 4138 if (proto) { 4139 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 4140 if (proto->isVariadic()) return QualType(); 4141 // Check that the types are compatible with the types that 4142 // would result from default argument promotions (C99 6.7.5.3p15). 4143 // The only types actually affected are promotable integer 4144 // types and floats, which would be passed as a different 4145 // type depending on whether the prototype is visible. 4146 unsigned proto_nargs = proto->getNumArgs(); 4147 for (unsigned i = 0; i < proto_nargs; ++i) { 4148 QualType argTy = proto->getArgType(i); 4149 if (argTy->isPromotableIntegerType() || 4150 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 4151 return QualType(); 4152 } 4153 4154 if (allLTypes) return lhs; 4155 if (allRTypes) return rhs; 4156 return getFunctionType(retType, proto->arg_type_begin(), 4157 proto->getNumArgs(), proto->isVariadic(), 4158 proto->getTypeQuals(), NoReturn); 4159 } 4160 4161 if (allLTypes) return lhs; 4162 if (allRTypes) return rhs; 4163 return getFunctionNoProtoType(retType, NoReturn); 4164} 4165 4166QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 4167 // C++ [expr]: If an expression initially has the type "reference to T", the 4168 // type is adjusted to "T" prior to any further analysis, the expression 4169 // designates the object or function denoted by the reference, and the 4170 // expression is an lvalue unless the reference is an rvalue reference and 4171 // the expression is a function call (possibly inside parentheses). 4172 // FIXME: C++ shouldn't be going through here! The rules are different 4173 // enough that they should be handled separately. 4174 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 4175 // shouldn't be going through here! 4176 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 4177 LHS = RT->getPointeeType(); 4178 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 4179 RHS = RT->getPointeeType(); 4180 4181 QualType LHSCan = getCanonicalType(LHS), 4182 RHSCan = getCanonicalType(RHS); 4183 4184 // If two types are identical, they are compatible. 4185 if (LHSCan == RHSCan) 4186 return LHS; 4187 4188 // If the qualifiers are different, the types aren't compatible... mostly. 4189 Qualifiers LQuals = LHSCan.getQualifiers(); 4190 Qualifiers RQuals = RHSCan.getQualifiers(); 4191 if (LQuals != RQuals) { 4192 // If any of these qualifiers are different, we have a type 4193 // mismatch. 4194 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 4195 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 4196 return QualType(); 4197 4198 // Exactly one GC qualifier difference is allowed: __strong is 4199 // okay if the other type has no GC qualifier but is an Objective 4200 // C object pointer (i.e. implicitly strong by default). We fix 4201 // this by pretending that the unqualified type was actually 4202 // qualified __strong. 4203 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 4204 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 4205 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 4206 4207 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 4208 return QualType(); 4209 4210 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 4211 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 4212 } 4213 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 4214 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 4215 } 4216 return QualType(); 4217 } 4218 4219 // Okay, qualifiers are equal. 4220 4221 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 4222 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 4223 4224 // We want to consider the two function types to be the same for these 4225 // comparisons, just force one to the other. 4226 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 4227 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 4228 4229 // Same as above for arrays 4230 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 4231 LHSClass = Type::ConstantArray; 4232 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 4233 RHSClass = Type::ConstantArray; 4234 4235 // Canonicalize ExtVector -> Vector. 4236 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 4237 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 4238 4239 // If the canonical type classes don't match. 4240 if (LHSClass != RHSClass) { 4241 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 4242 // a signed integer type, or an unsigned integer type. 4243 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 4244 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 4245 return RHS; 4246 } 4247 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 4248 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 4249 return LHS; 4250 } 4251 4252 return QualType(); 4253 } 4254 4255 // The canonical type classes match. 4256 switch (LHSClass) { 4257#define TYPE(Class, Base) 4258#define ABSTRACT_TYPE(Class, Base) 4259#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4260#define DEPENDENT_TYPE(Class, Base) case Type::Class: 4261#include "clang/AST/TypeNodes.def" 4262 assert(false && "Non-canonical and dependent types shouldn't get here"); 4263 return QualType(); 4264 4265 case Type::LValueReference: 4266 case Type::RValueReference: 4267 case Type::MemberPointer: 4268 assert(false && "C++ should never be in mergeTypes"); 4269 return QualType(); 4270 4271 case Type::IncompleteArray: 4272 case Type::VariableArray: 4273 case Type::FunctionProto: 4274 case Type::ExtVector: 4275 assert(false && "Types are eliminated above"); 4276 return QualType(); 4277 4278 case Type::Pointer: 4279 { 4280 // Merge two pointer types, while trying to preserve typedef info 4281 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 4282 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 4283 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4284 if (ResultType.isNull()) return QualType(); 4285 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4286 return LHS; 4287 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4288 return RHS; 4289 return getPointerType(ResultType); 4290 } 4291 case Type::BlockPointer: 4292 { 4293 // Merge two block pointer types, while trying to preserve typedef info 4294 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 4295 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 4296 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4297 if (ResultType.isNull()) return QualType(); 4298 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4299 return LHS; 4300 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4301 return RHS; 4302 return getBlockPointerType(ResultType); 4303 } 4304 case Type::ConstantArray: 4305 { 4306 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 4307 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 4308 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 4309 return QualType(); 4310 4311 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 4312 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 4313 QualType ResultType = mergeTypes(LHSElem, RHSElem); 4314 if (ResultType.isNull()) return QualType(); 4315 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4316 return LHS; 4317 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4318 return RHS; 4319 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 4320 ArrayType::ArraySizeModifier(), 0); 4321 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 4322 ArrayType::ArraySizeModifier(), 0); 4323 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 4324 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 4325 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4326 return LHS; 4327 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4328 return RHS; 4329 if (LVAT) { 4330 // FIXME: This isn't correct! But tricky to implement because 4331 // the array's size has to be the size of LHS, but the type 4332 // has to be different. 4333 return LHS; 4334 } 4335 if (RVAT) { 4336 // FIXME: This isn't correct! But tricky to implement because 4337 // the array's size has to be the size of RHS, but the type 4338 // has to be different. 4339 return RHS; 4340 } 4341 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4342 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4343 return getIncompleteArrayType(ResultType, 4344 ArrayType::ArraySizeModifier(), 0); 4345 } 4346 case Type::FunctionNoProto: 4347 return mergeFunctionTypes(LHS, RHS); 4348 case Type::Record: 4349 case Type::Enum: 4350 return QualType(); 4351 case Type::Builtin: 4352 // Only exactly equal builtin types are compatible, which is tested above. 4353 return QualType(); 4354 case Type::Complex: 4355 // Distinct complex types are incompatible. 4356 return QualType(); 4357 case Type::Vector: 4358 // FIXME: The merged type should be an ExtVector! 4359 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 4360 return LHS; 4361 return QualType(); 4362 case Type::ObjCInterface: { 4363 // Check if the interfaces are assignment compatible. 4364 // FIXME: This should be type compatibility, e.g. whether 4365 // "LHS x; RHS x;" at global scope is legal. 4366 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 4367 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 4368 if (LHSIface && RHSIface && 4369 canAssignObjCInterfaces(LHSIface, RHSIface)) 4370 return LHS; 4371 4372 return QualType(); 4373 } 4374 case Type::ObjCObjectPointer: { 4375 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4376 RHS->getAs<ObjCObjectPointerType>())) 4377 return LHS; 4378 4379 return QualType(); 4380 } 4381 case Type::FixedWidthInt: 4382 // Distinct fixed-width integers are not compatible. 4383 return QualType(); 4384 case Type::TemplateSpecialization: 4385 assert(false && "Dependent types have no size"); 4386 break; 4387 } 4388 4389 return QualType(); 4390} 4391 4392//===----------------------------------------------------------------------===// 4393// Integer Predicates 4394//===----------------------------------------------------------------------===// 4395 4396unsigned ASTContext::getIntWidth(QualType T) { 4397 if (T->isBooleanType()) 4398 return 1; 4399 if (FixedWidthIntType *FWIT = dyn_cast<FixedWidthIntType>(T)) { 4400 return FWIT->getWidth(); 4401 } 4402 // For builtin types, just use the standard type sizing method 4403 return (unsigned)getTypeSize(T); 4404} 4405 4406QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4407 assert(T->isSignedIntegerType() && "Unexpected type"); 4408 4409 // Turn <4 x signed int> -> <4 x unsigned int> 4410 if (const VectorType *VTy = T->getAs<VectorType>()) 4411 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4412 VTy->getNumElements()); 4413 4414 // For enums, we return the unsigned version of the base type. 4415 if (const EnumType *ETy = T->getAs<EnumType>()) 4416 T = ETy->getDecl()->getIntegerType(); 4417 4418 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4419 assert(BTy && "Unexpected signed integer type"); 4420 switch (BTy->getKind()) { 4421 case BuiltinType::Char_S: 4422 case BuiltinType::SChar: 4423 return UnsignedCharTy; 4424 case BuiltinType::Short: 4425 return UnsignedShortTy; 4426 case BuiltinType::Int: 4427 return UnsignedIntTy; 4428 case BuiltinType::Long: 4429 return UnsignedLongTy; 4430 case BuiltinType::LongLong: 4431 return UnsignedLongLongTy; 4432 case BuiltinType::Int128: 4433 return UnsignedInt128Ty; 4434 default: 4435 assert(0 && "Unexpected signed integer type"); 4436 return QualType(); 4437 } 4438} 4439 4440ExternalASTSource::~ExternalASTSource() { } 4441 4442void ExternalASTSource::PrintStats() { } 4443 4444 4445//===----------------------------------------------------------------------===// 4446// Builtin Type Computation 4447//===----------------------------------------------------------------------===// 4448 4449/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4450/// pointer over the consumed characters. This returns the resultant type. 4451static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4452 ASTContext::GetBuiltinTypeError &Error, 4453 bool AllowTypeModifiers = true) { 4454 // Modifiers. 4455 int HowLong = 0; 4456 bool Signed = false, Unsigned = false; 4457 4458 // Read the modifiers first. 4459 bool Done = false; 4460 while (!Done) { 4461 switch (*Str++) { 4462 default: Done = true; --Str; break; 4463 case 'S': 4464 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4465 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4466 Signed = true; 4467 break; 4468 case 'U': 4469 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4470 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4471 Unsigned = true; 4472 break; 4473 case 'L': 4474 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4475 ++HowLong; 4476 break; 4477 } 4478 } 4479 4480 QualType Type; 4481 4482 // Read the base type. 4483 switch (*Str++) { 4484 default: assert(0 && "Unknown builtin type letter!"); 4485 case 'v': 4486 assert(HowLong == 0 && !Signed && !Unsigned && 4487 "Bad modifiers used with 'v'!"); 4488 Type = Context.VoidTy; 4489 break; 4490 case 'f': 4491 assert(HowLong == 0 && !Signed && !Unsigned && 4492 "Bad modifiers used with 'f'!"); 4493 Type = Context.FloatTy; 4494 break; 4495 case 'd': 4496 assert(HowLong < 2 && !Signed && !Unsigned && 4497 "Bad modifiers used with 'd'!"); 4498 if (HowLong) 4499 Type = Context.LongDoubleTy; 4500 else 4501 Type = Context.DoubleTy; 4502 break; 4503 case 's': 4504 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4505 if (Unsigned) 4506 Type = Context.UnsignedShortTy; 4507 else 4508 Type = Context.ShortTy; 4509 break; 4510 case 'i': 4511 if (HowLong == 3) 4512 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4513 else if (HowLong == 2) 4514 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4515 else if (HowLong == 1) 4516 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4517 else 4518 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4519 break; 4520 case 'c': 4521 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4522 if (Signed) 4523 Type = Context.SignedCharTy; 4524 else if (Unsigned) 4525 Type = Context.UnsignedCharTy; 4526 else 4527 Type = Context.CharTy; 4528 break; 4529 case 'b': // boolean 4530 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4531 Type = Context.BoolTy; 4532 break; 4533 case 'z': // size_t. 4534 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4535 Type = Context.getSizeType(); 4536 break; 4537 case 'F': 4538 Type = Context.getCFConstantStringType(); 4539 break; 4540 case 'a': 4541 Type = Context.getBuiltinVaListType(); 4542 assert(!Type.isNull() && "builtin va list type not initialized!"); 4543 break; 4544 case 'A': 4545 // This is a "reference" to a va_list; however, what exactly 4546 // this means depends on how va_list is defined. There are two 4547 // different kinds of va_list: ones passed by value, and ones 4548 // passed by reference. An example of a by-value va_list is 4549 // x86, where va_list is a char*. An example of by-ref va_list 4550 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4551 // we want this argument to be a char*&; for x86-64, we want 4552 // it to be a __va_list_tag*. 4553 Type = Context.getBuiltinVaListType(); 4554 assert(!Type.isNull() && "builtin va list type not initialized!"); 4555 if (Type->isArrayType()) { 4556 Type = Context.getArrayDecayedType(Type); 4557 } else { 4558 Type = Context.getLValueReferenceType(Type); 4559 } 4560 break; 4561 case 'V': { 4562 char *End; 4563 unsigned NumElements = strtoul(Str, &End, 10); 4564 assert(End != Str && "Missing vector size"); 4565 4566 Str = End; 4567 4568 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4569 Type = Context.getVectorType(ElementType, NumElements); 4570 break; 4571 } 4572 case 'X': { 4573 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4574 Type = Context.getComplexType(ElementType); 4575 break; 4576 } 4577 case 'P': 4578 Type = Context.getFILEType(); 4579 if (Type.isNull()) { 4580 Error = ASTContext::GE_Missing_stdio; 4581 return QualType(); 4582 } 4583 break; 4584 case 'J': 4585 if (Signed) 4586 Type = Context.getsigjmp_bufType(); 4587 else 4588 Type = Context.getjmp_bufType(); 4589 4590 if (Type.isNull()) { 4591 Error = ASTContext::GE_Missing_setjmp; 4592 return QualType(); 4593 } 4594 break; 4595 } 4596 4597 if (!AllowTypeModifiers) 4598 return Type; 4599 4600 Done = false; 4601 while (!Done) { 4602 switch (*Str++) { 4603 default: Done = true; --Str; break; 4604 case '*': 4605 Type = Context.getPointerType(Type); 4606 break; 4607 case '&': 4608 Type = Context.getLValueReferenceType(Type); 4609 break; 4610 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4611 case 'C': 4612 Type = Type.withConst(); 4613 break; 4614 } 4615 } 4616 4617 return Type; 4618} 4619 4620/// GetBuiltinType - Return the type for the specified builtin. 4621QualType ASTContext::GetBuiltinType(unsigned id, 4622 GetBuiltinTypeError &Error) { 4623 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4624 4625 llvm::SmallVector<QualType, 8> ArgTypes; 4626 4627 Error = GE_None; 4628 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4629 if (Error != GE_None) 4630 return QualType(); 4631 while (TypeStr[0] && TypeStr[0] != '.') { 4632 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4633 if (Error != GE_None) 4634 return QualType(); 4635 4636 // Do array -> pointer decay. The builtin should use the decayed type. 4637 if (Ty->isArrayType()) 4638 Ty = getArrayDecayedType(Ty); 4639 4640 ArgTypes.push_back(Ty); 4641 } 4642 4643 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4644 "'.' should only occur at end of builtin type list!"); 4645 4646 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4647 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4648 return getFunctionNoProtoType(ResType); 4649 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4650 TypeStr[0] == '.', 0); 4651} 4652 4653QualType 4654ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4655 // Perform the usual unary conversions. We do this early so that 4656 // integral promotions to "int" can allow us to exit early, in the 4657 // lhs == rhs check. Also, for conversion purposes, we ignore any 4658 // qualifiers. For example, "const float" and "float" are 4659 // equivalent. 4660 if (lhs->isPromotableIntegerType()) 4661 lhs = getPromotedIntegerType(lhs); 4662 else 4663 lhs = lhs.getUnqualifiedType(); 4664 if (rhs->isPromotableIntegerType()) 4665 rhs = getPromotedIntegerType(rhs); 4666 else 4667 rhs = rhs.getUnqualifiedType(); 4668 4669 // If both types are identical, no conversion is needed. 4670 if (lhs == rhs) 4671 return lhs; 4672 4673 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4674 // The caller can deal with this (e.g. pointer + int). 4675 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4676 return lhs; 4677 4678 // At this point, we have two different arithmetic types. 4679 4680 // Handle complex types first (C99 6.3.1.8p1). 4681 if (lhs->isComplexType() || rhs->isComplexType()) { 4682 // if we have an integer operand, the result is the complex type. 4683 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4684 // convert the rhs to the lhs complex type. 4685 return lhs; 4686 } 4687 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4688 // convert the lhs to the rhs complex type. 4689 return rhs; 4690 } 4691 // This handles complex/complex, complex/float, or float/complex. 4692 // When both operands are complex, the shorter operand is converted to the 4693 // type of the longer, and that is the type of the result. This corresponds 4694 // to what is done when combining two real floating-point operands. 4695 // The fun begins when size promotion occur across type domains. 4696 // From H&S 6.3.4: When one operand is complex and the other is a real 4697 // floating-point type, the less precise type is converted, within it's 4698 // real or complex domain, to the precision of the other type. For example, 4699 // when combining a "long double" with a "double _Complex", the 4700 // "double _Complex" is promoted to "long double _Complex". 4701 int result = getFloatingTypeOrder(lhs, rhs); 4702 4703 if (result > 0) { // The left side is bigger, convert rhs. 4704 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4705 } else if (result < 0) { // The right side is bigger, convert lhs. 4706 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4707 } 4708 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4709 // domains match. This is a requirement for our implementation, C99 4710 // does not require this promotion. 4711 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4712 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4713 return rhs; 4714 } else { // handle "_Complex double, double". 4715 return lhs; 4716 } 4717 } 4718 return lhs; // The domain/size match exactly. 4719 } 4720 // Now handle "real" floating types (i.e. float, double, long double). 4721 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4722 // if we have an integer operand, the result is the real floating type. 4723 if (rhs->isIntegerType()) { 4724 // convert rhs to the lhs floating point type. 4725 return lhs; 4726 } 4727 if (rhs->isComplexIntegerType()) { 4728 // convert rhs to the complex floating point type. 4729 return getComplexType(lhs); 4730 } 4731 if (lhs->isIntegerType()) { 4732 // convert lhs to the rhs floating point type. 4733 return rhs; 4734 } 4735 if (lhs->isComplexIntegerType()) { 4736 // convert lhs to the complex floating point type. 4737 return getComplexType(rhs); 4738 } 4739 // We have two real floating types, float/complex combos were handled above. 4740 // Convert the smaller operand to the bigger result. 4741 int result = getFloatingTypeOrder(lhs, rhs); 4742 if (result > 0) // convert the rhs 4743 return lhs; 4744 assert(result < 0 && "illegal float comparison"); 4745 return rhs; // convert the lhs 4746 } 4747 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4748 // Handle GCC complex int extension. 4749 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4750 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4751 4752 if (lhsComplexInt && rhsComplexInt) { 4753 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4754 rhsComplexInt->getElementType()) >= 0) 4755 return lhs; // convert the rhs 4756 return rhs; 4757 } else if (lhsComplexInt && rhs->isIntegerType()) { 4758 // convert the rhs to the lhs complex type. 4759 return lhs; 4760 } else if (rhsComplexInt && lhs->isIntegerType()) { 4761 // convert the lhs to the rhs complex type. 4762 return rhs; 4763 } 4764 } 4765 // Finally, we have two differing integer types. 4766 // The rules for this case are in C99 6.3.1.8 4767 int compare = getIntegerTypeOrder(lhs, rhs); 4768 bool lhsSigned = lhs->isSignedIntegerType(), 4769 rhsSigned = rhs->isSignedIntegerType(); 4770 QualType destType; 4771 if (lhsSigned == rhsSigned) { 4772 // Same signedness; use the higher-ranked type 4773 destType = compare >= 0 ? lhs : rhs; 4774 } else if (compare != (lhsSigned ? 1 : -1)) { 4775 // The unsigned type has greater than or equal rank to the 4776 // signed type, so use the unsigned type 4777 destType = lhsSigned ? rhs : lhs; 4778 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4779 // The two types are different widths; if we are here, that 4780 // means the signed type is larger than the unsigned type, so 4781 // use the signed type. 4782 destType = lhsSigned ? lhs : rhs; 4783 } else { 4784 // The signed type is higher-ranked than the unsigned type, 4785 // but isn't actually any bigger (like unsigned int and long 4786 // on most 32-bit systems). Use the unsigned type corresponding 4787 // to the signed type. 4788 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4789 } 4790 return destType; 4791} 4792