ASTContext.cpp revision 54e14c4db764c0636160d26c5bbf491637c83a76
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/StringExtras.h" 26#include "llvm/Support/MathExtras.h" 27#include "llvm/Support/MemoryBuffer.h" 28#include "RecordLayoutBuilder.h" 29 30using namespace clang; 31 32enum FloatingRank { 33 FloatRank, DoubleRank, LongDoubleRank 34}; 35 36ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 37 TargetInfo &t, 38 IdentifierTable &idents, SelectorTable &sels, 39 Builtin::Context &builtins, 40 bool FreeMem, unsigned size_reserve) : 41 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 42 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 43 sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0), 44 SourceMgr(SM), LangOpts(LOpts), 45 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 46 Idents(idents), Selectors(sels), 47 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 48 ObjCIdRedefinitionType = QualType(); 49 ObjCClassRedefinitionType = QualType(); 50 if (size_reserve > 0) Types.reserve(size_reserve); 51 TUDecl = TranslationUnitDecl::Create(*this); 52 InitBuiltinTypes(); 53} 54 55ASTContext::~ASTContext() { 56 // Deallocate all the types. 57 while (!Types.empty()) { 58 Types.back()->Destroy(*this); 59 Types.pop_back(); 60 } 61 62 { 63 llvm::FoldingSet<ExtQuals>::iterator 64 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); 65 while (I != E) 66 Deallocate(&*I++); 67 } 68 69 { 70 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 71 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 72 while (I != E) { 73 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 74 delete R; 75 } 76 } 77 78 { 79 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 80 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 81 while (I != E) { 82 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 83 delete R; 84 } 85 } 86 87 // Destroy nested-name-specifiers. 88 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 89 NNS = NestedNameSpecifiers.begin(), 90 NNSEnd = NestedNameSpecifiers.end(); 91 NNS != NNSEnd; 92 /* Increment in loop */) 93 (*NNS++).Destroy(*this); 94 95 if (GlobalNestedNameSpecifier) 96 GlobalNestedNameSpecifier->Destroy(*this); 97 98 TUDecl->Destroy(*this); 99} 100 101void 102ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 103 ExternalSource.reset(Source.take()); 104} 105 106void ASTContext::PrintStats() const { 107 fprintf(stderr, "*** AST Context Stats:\n"); 108 fprintf(stderr, " %d types total.\n", (int)Types.size()); 109 110 unsigned counts[] = { 111#define TYPE(Name, Parent) 0, 112#define ABSTRACT_TYPE(Name, Parent) 113#include "clang/AST/TypeNodes.def" 114 0 // Extra 115 }; 116 117 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 118 Type *T = Types[i]; 119 counts[(unsigned)T->getTypeClass()]++; 120 } 121 122 unsigned Idx = 0; 123 unsigned TotalBytes = 0; 124#define TYPE(Name, Parent) \ 125 if (counts[Idx]) \ 126 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 127 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 128 ++Idx; 129#define ABSTRACT_TYPE(Name, Parent) 130#include "clang/AST/TypeNodes.def" 131 132 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 133 134 if (ExternalSource.get()) { 135 fprintf(stderr, "\n"); 136 ExternalSource->PrintStats(); 137 } 138} 139 140 141void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 142 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 143 R = QualType(Ty, 0); 144 Types.push_back(Ty); 145} 146 147void ASTContext::InitBuiltinTypes() { 148 assert(VoidTy.isNull() && "Context reinitialized?"); 149 150 // C99 6.2.5p19. 151 InitBuiltinType(VoidTy, BuiltinType::Void); 152 153 // C99 6.2.5p2. 154 InitBuiltinType(BoolTy, BuiltinType::Bool); 155 // C99 6.2.5p3. 156 if (LangOpts.CharIsSigned) 157 InitBuiltinType(CharTy, BuiltinType::Char_S); 158 else 159 InitBuiltinType(CharTy, BuiltinType::Char_U); 160 // C99 6.2.5p4. 161 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 162 InitBuiltinType(ShortTy, BuiltinType::Short); 163 InitBuiltinType(IntTy, BuiltinType::Int); 164 InitBuiltinType(LongTy, BuiltinType::Long); 165 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 166 167 // C99 6.2.5p6. 168 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 169 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 170 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 171 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 172 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 173 174 // C99 6.2.5p10. 175 InitBuiltinType(FloatTy, BuiltinType::Float); 176 InitBuiltinType(DoubleTy, BuiltinType::Double); 177 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 178 179 // GNU extension, 128-bit integers. 180 InitBuiltinType(Int128Ty, BuiltinType::Int128); 181 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 182 183 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 184 InitBuiltinType(WCharTy, BuiltinType::WChar); 185 else // C99 186 WCharTy = getFromTargetType(Target.getWCharType()); 187 188 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 189 InitBuiltinType(Char16Ty, BuiltinType::Char16); 190 else // C99 191 Char16Ty = getFromTargetType(Target.getChar16Type()); 192 193 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 194 InitBuiltinType(Char32Ty, BuiltinType::Char32); 195 else // C99 196 Char32Ty = getFromTargetType(Target.getChar32Type()); 197 198 // Placeholder type for functions. 199 InitBuiltinType(OverloadTy, BuiltinType::Overload); 200 201 // Placeholder type for type-dependent expressions whose type is 202 // completely unknown. No code should ever check a type against 203 // DependentTy and users should never see it; however, it is here to 204 // help diagnose failures to properly check for type-dependent 205 // expressions. 206 InitBuiltinType(DependentTy, BuiltinType::Dependent); 207 208 // Placeholder type for C++0x auto declarations whose real type has 209 // not yet been deduced. 210 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 211 212 // C99 6.2.5p11. 213 FloatComplexTy = getComplexType(FloatTy); 214 DoubleComplexTy = getComplexType(DoubleTy); 215 LongDoubleComplexTy = getComplexType(LongDoubleTy); 216 217 BuiltinVaListType = QualType(); 218 219 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 220 ObjCIdTypedefType = QualType(); 221 ObjCClassTypedefType = QualType(); 222 223 // Builtin types for 'id' and 'Class'. 224 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 225 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 226 227 ObjCConstantStringType = QualType(); 228 229 // void * type 230 VoidPtrTy = getPointerType(VoidTy); 231 232 // nullptr type (C++0x 2.14.7) 233 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 234} 235 236MemberSpecializationInfo * 237ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 238 assert(Var->isStaticDataMember() && "Not a static data member"); 239 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 240 = InstantiatedFromStaticDataMember.find(Var); 241 if (Pos == InstantiatedFromStaticDataMember.end()) 242 return 0; 243 244 return Pos->second; 245} 246 247void 248ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 249 TemplateSpecializationKind TSK) { 250 assert(Inst->isStaticDataMember() && "Not a static data member"); 251 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 252 assert(!InstantiatedFromStaticDataMember[Inst] && 253 "Already noted what static data member was instantiated from"); 254 InstantiatedFromStaticDataMember[Inst] 255 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 256} 257 258UnresolvedUsingDecl * 259ASTContext::getInstantiatedFromUnresolvedUsingDecl(UsingDecl *UUD) { 260 llvm::DenseMap<UsingDecl *, UnresolvedUsingDecl *>::iterator Pos 261 = InstantiatedFromUnresolvedUsingDecl.find(UUD); 262 if (Pos == InstantiatedFromUnresolvedUsingDecl.end()) 263 return 0; 264 265 return Pos->second; 266} 267 268void 269ASTContext::setInstantiatedFromUnresolvedUsingDecl(UsingDecl *UD, 270 UnresolvedUsingDecl *UUD) { 271 assert(!InstantiatedFromUnresolvedUsingDecl[UD] && 272 "Already noted what using decl what instantiated from"); 273 InstantiatedFromUnresolvedUsingDecl[UD] = UUD; 274} 275 276FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 277 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 278 = InstantiatedFromUnnamedFieldDecl.find(Field); 279 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 280 return 0; 281 282 return Pos->second; 283} 284 285void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 286 FieldDecl *Tmpl) { 287 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 288 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 289 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 290 "Already noted what unnamed field was instantiated from"); 291 292 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 293} 294 295namespace { 296 class BeforeInTranslationUnit 297 : std::binary_function<SourceRange, SourceRange, bool> { 298 SourceManager *SourceMgr; 299 300 public: 301 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 302 303 bool operator()(SourceRange X, SourceRange Y) { 304 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 305 } 306 }; 307} 308 309/// \brief Determine whether the given comment is a Doxygen-style comment. 310/// 311/// \param Start the start of the comment text. 312/// 313/// \param End the end of the comment text. 314/// 315/// \param Member whether we want to check whether this is a member comment 316/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 317/// we only return true when we find a non-member comment. 318static bool 319isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 320 bool Member = false) { 321 const char *BufferStart 322 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 323 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 324 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 325 326 if (End - Start < 4) 327 return false; 328 329 assert(Start[0] == '/' && "Not a comment?"); 330 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 331 return false; 332 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 333 return false; 334 335 return (Start[3] == '<') == Member; 336} 337 338/// \brief Retrieve the comment associated with the given declaration, if 339/// it has one. 340const char *ASTContext::getCommentForDecl(const Decl *D) { 341 if (!D) 342 return 0; 343 344 // Check whether we have cached a comment string for this declaration 345 // already. 346 llvm::DenseMap<const Decl *, std::string>::iterator Pos 347 = DeclComments.find(D); 348 if (Pos != DeclComments.end()) 349 return Pos->second.c_str(); 350 351 // If we have an external AST source and have not yet loaded comments from 352 // that source, do so now. 353 if (ExternalSource && !LoadedExternalComments) { 354 std::vector<SourceRange> LoadedComments; 355 ExternalSource->ReadComments(LoadedComments); 356 357 if (!LoadedComments.empty()) 358 Comments.insert(Comments.begin(), LoadedComments.begin(), 359 LoadedComments.end()); 360 361 LoadedExternalComments = true; 362 } 363 364 // If there are no comments anywhere, we won't find anything. 365 if (Comments.empty()) 366 return 0; 367 368 // If the declaration doesn't map directly to a location in a file, we 369 // can't find the comment. 370 SourceLocation DeclStartLoc = D->getLocStart(); 371 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 372 return 0; 373 374 // Find the comment that occurs just before this declaration. 375 std::vector<SourceRange>::iterator LastComment 376 = std::lower_bound(Comments.begin(), Comments.end(), 377 SourceRange(DeclStartLoc), 378 BeforeInTranslationUnit(&SourceMgr)); 379 380 // Decompose the location for the start of the declaration and find the 381 // beginning of the file buffer. 382 std::pair<FileID, unsigned> DeclStartDecomp 383 = SourceMgr.getDecomposedLoc(DeclStartLoc); 384 const char *FileBufferStart 385 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 386 387 // First check whether we have a comment for a member. 388 if (LastComment != Comments.end() && 389 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 390 isDoxygenComment(SourceMgr, *LastComment, true)) { 391 std::pair<FileID, unsigned> LastCommentEndDecomp 392 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 393 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 394 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 395 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 396 LastCommentEndDecomp.second)) { 397 // The Doxygen member comment comes after the declaration starts and 398 // is on the same line and in the same file as the declaration. This 399 // is the comment we want. 400 std::string &Result = DeclComments[D]; 401 Result.append(FileBufferStart + 402 SourceMgr.getFileOffset(LastComment->getBegin()), 403 FileBufferStart + LastCommentEndDecomp.second + 1); 404 return Result.c_str(); 405 } 406 } 407 408 if (LastComment == Comments.begin()) 409 return 0; 410 --LastComment; 411 412 // Decompose the end of the comment. 413 std::pair<FileID, unsigned> LastCommentEndDecomp 414 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 415 416 // If the comment and the declaration aren't in the same file, then they 417 // aren't related. 418 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 419 return 0; 420 421 // Check that we actually have a Doxygen comment. 422 if (!isDoxygenComment(SourceMgr, *LastComment)) 423 return 0; 424 425 // Compute the starting line for the declaration and for the end of the 426 // comment (this is expensive). 427 unsigned DeclStartLine 428 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 429 unsigned CommentEndLine 430 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 431 LastCommentEndDecomp.second); 432 433 // If the comment does not end on the line prior to the declaration, then 434 // the comment is not associated with the declaration at all. 435 if (CommentEndLine + 1 != DeclStartLine) 436 return 0; 437 438 // We have a comment, but there may be more comments on the previous lines. 439 // Keep looking so long as the comments are still Doxygen comments and are 440 // still adjacent. 441 unsigned ExpectedLine 442 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 443 std::vector<SourceRange>::iterator FirstComment = LastComment; 444 while (FirstComment != Comments.begin()) { 445 // Look at the previous comment 446 --FirstComment; 447 std::pair<FileID, unsigned> Decomp 448 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 449 450 // If this previous comment is in a different file, we're done. 451 if (Decomp.first != DeclStartDecomp.first) { 452 ++FirstComment; 453 break; 454 } 455 456 // If this comment is not a Doxygen comment, we're done. 457 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 458 ++FirstComment; 459 break; 460 } 461 462 // If the line number is not what we expected, we're done. 463 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 464 if (Line != ExpectedLine) { 465 ++FirstComment; 466 break; 467 } 468 469 // Set the next expected line number. 470 ExpectedLine 471 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 472 } 473 474 // The iterator range [FirstComment, LastComment] contains all of the 475 // BCPL comments that, together, are associated with this declaration. 476 // Form a single comment block string for this declaration that concatenates 477 // all of these comments. 478 std::string &Result = DeclComments[D]; 479 while (FirstComment != LastComment) { 480 std::pair<FileID, unsigned> DecompStart 481 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 482 std::pair<FileID, unsigned> DecompEnd 483 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 484 Result.append(FileBufferStart + DecompStart.second, 485 FileBufferStart + DecompEnd.second + 1); 486 ++FirstComment; 487 } 488 489 // Append the last comment line. 490 Result.append(FileBufferStart + 491 SourceMgr.getFileOffset(LastComment->getBegin()), 492 FileBufferStart + LastCommentEndDecomp.second + 1); 493 return Result.c_str(); 494} 495 496//===----------------------------------------------------------------------===// 497// Type Sizing and Analysis 498//===----------------------------------------------------------------------===// 499 500/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 501/// scalar floating point type. 502const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 503 const BuiltinType *BT = T->getAs<BuiltinType>(); 504 assert(BT && "Not a floating point type!"); 505 switch (BT->getKind()) { 506 default: assert(0 && "Not a floating point type!"); 507 case BuiltinType::Float: return Target.getFloatFormat(); 508 case BuiltinType::Double: return Target.getDoubleFormat(); 509 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 510 } 511} 512 513/// getDeclAlignInBytes - Return a conservative estimate of the alignment of the 514/// specified decl. Note that bitfields do not have a valid alignment, so 515/// this method will assert on them. 516unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 517 unsigned Align = Target.getCharWidth(); 518 519 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 520 Align = std::max(Align, AA->getAlignment()); 521 522 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 523 QualType T = VD->getType(); 524 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 525 unsigned AS = RT->getPointeeType().getAddressSpace(); 526 Align = Target.getPointerAlign(AS); 527 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 528 // Incomplete or function types default to 1. 529 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 530 T = cast<ArrayType>(T)->getElementType(); 531 532 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 533 } 534 } 535 536 return Align / Target.getCharWidth(); 537} 538 539/// getTypeSize - Return the size of the specified type, in bits. This method 540/// does not work on incomplete types. 541/// 542/// FIXME: Pointers into different addr spaces could have different sizes and 543/// alignment requirements: getPointerInfo should take an AddrSpace, this 544/// should take a QualType, &c. 545std::pair<uint64_t, unsigned> 546ASTContext::getTypeInfo(const Type *T) { 547 uint64_t Width=0; 548 unsigned Align=8; 549 switch (T->getTypeClass()) { 550#define TYPE(Class, Base) 551#define ABSTRACT_TYPE(Class, Base) 552#define NON_CANONICAL_TYPE(Class, Base) 553#define DEPENDENT_TYPE(Class, Base) case Type::Class: 554#include "clang/AST/TypeNodes.def" 555 assert(false && "Should not see dependent types"); 556 break; 557 558 case Type::FunctionNoProto: 559 case Type::FunctionProto: 560 // GCC extension: alignof(function) = 32 bits 561 Width = 0; 562 Align = 32; 563 break; 564 565 case Type::IncompleteArray: 566 case Type::VariableArray: 567 Width = 0; 568 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 569 break; 570 571 case Type::ConstantArray: { 572 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 573 574 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 575 Width = EltInfo.first*CAT->getSize().getZExtValue(); 576 Align = EltInfo.second; 577 break; 578 } 579 case Type::ExtVector: 580 case Type::Vector: { 581 const VectorType *VT = cast<VectorType>(T); 582 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 583 Width = EltInfo.first*VT->getNumElements(); 584 Align = Width; 585 // If the alignment is not a power of 2, round up to the next power of 2. 586 // This happens for non-power-of-2 length vectors. 587 if (VT->getNumElements() & (VT->getNumElements()-1)) { 588 Align = llvm::NextPowerOf2(Align); 589 Width = llvm::RoundUpToAlignment(Width, Align); 590 } 591 break; 592 } 593 594 case Type::Builtin: 595 switch (cast<BuiltinType>(T)->getKind()) { 596 default: assert(0 && "Unknown builtin type!"); 597 case BuiltinType::Void: 598 // GCC extension: alignof(void) = 8 bits. 599 Width = 0; 600 Align = 8; 601 break; 602 603 case BuiltinType::Bool: 604 Width = Target.getBoolWidth(); 605 Align = Target.getBoolAlign(); 606 break; 607 case BuiltinType::Char_S: 608 case BuiltinType::Char_U: 609 case BuiltinType::UChar: 610 case BuiltinType::SChar: 611 Width = Target.getCharWidth(); 612 Align = Target.getCharAlign(); 613 break; 614 case BuiltinType::WChar: 615 Width = Target.getWCharWidth(); 616 Align = Target.getWCharAlign(); 617 break; 618 case BuiltinType::Char16: 619 Width = Target.getChar16Width(); 620 Align = Target.getChar16Align(); 621 break; 622 case BuiltinType::Char32: 623 Width = Target.getChar32Width(); 624 Align = Target.getChar32Align(); 625 break; 626 case BuiltinType::UShort: 627 case BuiltinType::Short: 628 Width = Target.getShortWidth(); 629 Align = Target.getShortAlign(); 630 break; 631 case BuiltinType::UInt: 632 case BuiltinType::Int: 633 Width = Target.getIntWidth(); 634 Align = Target.getIntAlign(); 635 break; 636 case BuiltinType::ULong: 637 case BuiltinType::Long: 638 Width = Target.getLongWidth(); 639 Align = Target.getLongAlign(); 640 break; 641 case BuiltinType::ULongLong: 642 case BuiltinType::LongLong: 643 Width = Target.getLongLongWidth(); 644 Align = Target.getLongLongAlign(); 645 break; 646 case BuiltinType::Int128: 647 case BuiltinType::UInt128: 648 Width = 128; 649 Align = 128; // int128_t is 128-bit aligned on all targets. 650 break; 651 case BuiltinType::Float: 652 Width = Target.getFloatWidth(); 653 Align = Target.getFloatAlign(); 654 break; 655 case BuiltinType::Double: 656 Width = Target.getDoubleWidth(); 657 Align = Target.getDoubleAlign(); 658 break; 659 case BuiltinType::LongDouble: 660 Width = Target.getLongDoubleWidth(); 661 Align = Target.getLongDoubleAlign(); 662 break; 663 case BuiltinType::NullPtr: 664 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 665 Align = Target.getPointerAlign(0); // == sizeof(void*) 666 break; 667 } 668 break; 669 case Type::FixedWidthInt: 670 // FIXME: This isn't precisely correct; the width/alignment should depend 671 // on the available types for the target 672 Width = cast<FixedWidthIntType>(T)->getWidth(); 673 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 674 Align = Width; 675 break; 676 case Type::ObjCObjectPointer: 677 Width = Target.getPointerWidth(0); 678 Align = Target.getPointerAlign(0); 679 break; 680 case Type::BlockPointer: { 681 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 682 Width = Target.getPointerWidth(AS); 683 Align = Target.getPointerAlign(AS); 684 break; 685 } 686 case Type::Pointer: { 687 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 688 Width = Target.getPointerWidth(AS); 689 Align = Target.getPointerAlign(AS); 690 break; 691 } 692 case Type::LValueReference: 693 case Type::RValueReference: 694 // "When applied to a reference or a reference type, the result is the size 695 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 696 // FIXME: This is wrong for struct layout: a reference in a struct has 697 // pointer size. 698 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 699 case Type::MemberPointer: { 700 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 701 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 702 // If we ever want to support other ABIs this needs to be abstracted. 703 704 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 705 std::pair<uint64_t, unsigned> PtrDiffInfo = 706 getTypeInfo(getPointerDiffType()); 707 Width = PtrDiffInfo.first; 708 if (Pointee->isFunctionType()) 709 Width *= 2; 710 Align = PtrDiffInfo.second; 711 break; 712 } 713 case Type::Complex: { 714 // Complex types have the same alignment as their elements, but twice the 715 // size. 716 std::pair<uint64_t, unsigned> EltInfo = 717 getTypeInfo(cast<ComplexType>(T)->getElementType()); 718 Width = EltInfo.first*2; 719 Align = EltInfo.second; 720 break; 721 } 722 case Type::ObjCInterface: { 723 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 724 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 725 Width = Layout.getSize(); 726 Align = Layout.getAlignment(); 727 break; 728 } 729 case Type::Record: 730 case Type::Enum: { 731 const TagType *TT = cast<TagType>(T); 732 733 if (TT->getDecl()->isInvalidDecl()) { 734 Width = 1; 735 Align = 1; 736 break; 737 } 738 739 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 740 return getTypeInfo(ET->getDecl()->getIntegerType()); 741 742 const RecordType *RT = cast<RecordType>(TT); 743 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 744 Width = Layout.getSize(); 745 Align = Layout.getAlignment(); 746 break; 747 } 748 749 case Type::SubstTemplateTypeParm: 750 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 751 getReplacementType().getTypePtr()); 752 753 case Type::Elaborated: 754 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType() 755 .getTypePtr()); 756 757 case Type::Typedef: { 758 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 759 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 760 Align = Aligned->getAlignment(); 761 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 762 } else 763 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 764 break; 765 } 766 767 case Type::TypeOfExpr: 768 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 769 .getTypePtr()); 770 771 case Type::TypeOf: 772 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 773 774 case Type::Decltype: 775 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 776 .getTypePtr()); 777 778 case Type::QualifiedName: 779 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 780 781 case Type::TemplateSpecialization: 782 assert(getCanonicalType(T) != T && 783 "Cannot request the size of a dependent type"); 784 // FIXME: this is likely to be wrong once we support template 785 // aliases, since a template alias could refer to a typedef that 786 // has an __aligned__ attribute on it. 787 return getTypeInfo(getCanonicalType(T)); 788 } 789 790 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 791 return std::make_pair(Width, Align); 792} 793 794/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 795/// type for the current target in bits. This can be different than the ABI 796/// alignment in cases where it is beneficial for performance to overalign 797/// a data type. 798unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 799 unsigned ABIAlign = getTypeAlign(T); 800 801 // Double and long long should be naturally aligned if possible. 802 if (const ComplexType* CT = T->getAs<ComplexType>()) 803 T = CT->getElementType().getTypePtr(); 804 if (T->isSpecificBuiltinType(BuiltinType::Double) || 805 T->isSpecificBuiltinType(BuiltinType::LongLong)) 806 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 807 808 return ABIAlign; 809} 810 811static void CollectLocalObjCIvars(ASTContext *Ctx, 812 const ObjCInterfaceDecl *OI, 813 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 814 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 815 E = OI->ivar_end(); I != E; ++I) { 816 ObjCIvarDecl *IVDecl = *I; 817 if (!IVDecl->isInvalidDecl()) 818 Fields.push_back(cast<FieldDecl>(IVDecl)); 819 } 820} 821 822void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 823 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 824 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 825 CollectObjCIvars(SuperClass, Fields); 826 CollectLocalObjCIvars(this, OI, Fields); 827} 828 829/// ShallowCollectObjCIvars - 830/// Collect all ivars, including those synthesized, in the current class. 831/// 832void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 833 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 834 bool CollectSynthesized) { 835 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 836 E = OI->ivar_end(); I != E; ++I) { 837 Ivars.push_back(*I); 838 } 839 if (CollectSynthesized) 840 CollectSynthesizedIvars(OI, Ivars); 841} 842 843void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 844 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 845 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 846 E = PD->prop_end(); I != E; ++I) 847 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 848 Ivars.push_back(Ivar); 849 850 // Also look into nested protocols. 851 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 852 E = PD->protocol_end(); P != E; ++P) 853 CollectProtocolSynthesizedIvars(*P, Ivars); 854} 855 856/// CollectSynthesizedIvars - 857/// This routine collect synthesized ivars for the designated class. 858/// 859void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 860 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 861 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 862 E = OI->prop_end(); I != E; ++I) { 863 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 864 Ivars.push_back(Ivar); 865 } 866 // Also look into interface's protocol list for properties declared 867 // in the protocol and whose ivars are synthesized. 868 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 869 PE = OI->protocol_end(); P != PE; ++P) { 870 ObjCProtocolDecl *PD = (*P); 871 CollectProtocolSynthesizedIvars(PD, Ivars); 872 } 873} 874 875unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 876 unsigned count = 0; 877 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 878 E = PD->prop_end(); I != E; ++I) 879 if ((*I)->getPropertyIvarDecl()) 880 ++count; 881 882 // Also look into nested protocols. 883 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 884 E = PD->protocol_end(); P != E; ++P) 885 count += CountProtocolSynthesizedIvars(*P); 886 return count; 887} 888 889unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) { 890 unsigned count = 0; 891 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 892 E = OI->prop_end(); I != E; ++I) { 893 if ((*I)->getPropertyIvarDecl()) 894 ++count; 895 } 896 // Also look into interface's protocol list for properties declared 897 // in the protocol and whose ivars are synthesized. 898 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 899 PE = OI->protocol_end(); P != PE; ++P) { 900 ObjCProtocolDecl *PD = (*P); 901 count += CountProtocolSynthesizedIvars(PD); 902 } 903 return count; 904} 905 906/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 907ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 908 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 909 I = ObjCImpls.find(D); 910 if (I != ObjCImpls.end()) 911 return cast<ObjCImplementationDecl>(I->second); 912 return 0; 913} 914/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 915ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 916 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 917 I = ObjCImpls.find(D); 918 if (I != ObjCImpls.end()) 919 return cast<ObjCCategoryImplDecl>(I->second); 920 return 0; 921} 922 923/// \brief Set the implementation of ObjCInterfaceDecl. 924void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 925 ObjCImplementationDecl *ImplD) { 926 assert(IFaceD && ImplD && "Passed null params"); 927 ObjCImpls[IFaceD] = ImplD; 928} 929/// \brief Set the implementation of ObjCCategoryDecl. 930void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 931 ObjCCategoryImplDecl *ImplD) { 932 assert(CatD && ImplD && "Passed null params"); 933 ObjCImpls[CatD] = ImplD; 934} 935 936/// \brief Allocate an uninitialized DeclaratorInfo. 937/// 938/// The caller should initialize the memory held by DeclaratorInfo using 939/// the TypeLoc wrappers. 940/// 941/// \param T the type that will be the basis for type source info. This type 942/// should refer to how the declarator was written in source code, not to 943/// what type semantic analysis resolved the declarator to. 944DeclaratorInfo *ASTContext::CreateDeclaratorInfo(QualType T, 945 unsigned DataSize) { 946 if (!DataSize) 947 DataSize = TypeLoc::getFullDataSizeForType(T); 948 else 949 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 950 "incorrect data size provided to CreateDeclaratorInfo!"); 951 952 DeclaratorInfo *DInfo = 953 (DeclaratorInfo*)BumpAlloc.Allocate(sizeof(DeclaratorInfo) + DataSize, 8); 954 new (DInfo) DeclaratorInfo(T); 955 return DInfo; 956} 957 958/// getInterfaceLayoutImpl - Get or compute information about the 959/// layout of the given interface. 960/// 961/// \param Impl - If given, also include the layout of the interface's 962/// implementation. This may differ by including synthesized ivars. 963const ASTRecordLayout & 964ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 965 const ObjCImplementationDecl *Impl) { 966 assert(!D->isForwardDecl() && "Invalid interface decl!"); 967 968 // Look up this layout, if already laid out, return what we have. 969 ObjCContainerDecl *Key = 970 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 971 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 972 return *Entry; 973 974 // Add in synthesized ivar count if laying out an implementation. 975 if (Impl) { 976 unsigned FieldCount = D->ivar_size(); 977 unsigned SynthCount = CountSynthesizedIvars(D); 978 FieldCount += SynthCount; 979 // If there aren't any sythesized ivars then reuse the interface 980 // entry. Note we can't cache this because we simply free all 981 // entries later; however we shouldn't look up implementations 982 // frequently. 983 if (SynthCount == 0) 984 return getObjCLayout(D, 0); 985 } 986 987 const ASTRecordLayout *NewEntry = 988 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 989 ObjCLayouts[Key] = NewEntry; 990 991 return *NewEntry; 992} 993 994const ASTRecordLayout & 995ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 996 return getObjCLayout(D, 0); 997} 998 999const ASTRecordLayout & 1000ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 1001 return getObjCLayout(D->getClassInterface(), D); 1002} 1003 1004/// getASTRecordLayout - Get or compute information about the layout of the 1005/// specified record (struct/union/class), which indicates its size and field 1006/// position information. 1007const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 1008 D = D->getDefinition(*this); 1009 assert(D && "Cannot get layout of forward declarations!"); 1010 1011 // Look up this layout, if already laid out, return what we have. 1012 // Note that we can't save a reference to the entry because this function 1013 // is recursive. 1014 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 1015 if (Entry) return *Entry; 1016 1017 const ASTRecordLayout *NewEntry = 1018 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 1019 ASTRecordLayouts[D] = NewEntry; 1020 1021 return *NewEntry; 1022} 1023 1024//===----------------------------------------------------------------------===// 1025// Type creation/memoization methods 1026//===----------------------------------------------------------------------===// 1027 1028QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1029 unsigned Fast = Quals.getFastQualifiers(); 1030 Quals.removeFastQualifiers(); 1031 1032 // Check if we've already instantiated this type. 1033 llvm::FoldingSetNodeID ID; 1034 ExtQuals::Profile(ID, TypeNode, Quals); 1035 void *InsertPos = 0; 1036 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1037 assert(EQ->getQualifiers() == Quals); 1038 QualType T = QualType(EQ, Fast); 1039 return T; 1040 } 1041 1042 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1043 ExtQualNodes.InsertNode(New, InsertPos); 1044 QualType T = QualType(New, Fast); 1045 return T; 1046} 1047 1048QualType ASTContext::getVolatileType(QualType T) { 1049 QualType CanT = getCanonicalType(T); 1050 if (CanT.isVolatileQualified()) return T; 1051 1052 QualifierCollector Quals; 1053 const Type *TypeNode = Quals.strip(T); 1054 Quals.addVolatile(); 1055 1056 return getExtQualType(TypeNode, Quals); 1057} 1058 1059QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1060 QualType CanT = getCanonicalType(T); 1061 if (CanT.getAddressSpace() == AddressSpace) 1062 return T; 1063 1064 // If we are composing extended qualifiers together, merge together 1065 // into one ExtQuals node. 1066 QualifierCollector Quals; 1067 const Type *TypeNode = Quals.strip(T); 1068 1069 // If this type already has an address space specified, it cannot get 1070 // another one. 1071 assert(!Quals.hasAddressSpace() && 1072 "Type cannot be in multiple addr spaces!"); 1073 Quals.addAddressSpace(AddressSpace); 1074 1075 return getExtQualType(TypeNode, Quals); 1076} 1077 1078QualType ASTContext::getObjCGCQualType(QualType T, 1079 Qualifiers::GC GCAttr) { 1080 QualType CanT = getCanonicalType(T); 1081 if (CanT.getObjCGCAttr() == GCAttr) 1082 return T; 1083 1084 if (T->isPointerType()) { 1085 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1086 if (Pointee->isAnyPointerType()) { 1087 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1088 return getPointerType(ResultType); 1089 } 1090 } 1091 1092 // If we are composing extended qualifiers together, merge together 1093 // into one ExtQuals node. 1094 QualifierCollector Quals; 1095 const Type *TypeNode = Quals.strip(T); 1096 1097 // If this type already has an ObjCGC specified, it cannot get 1098 // another one. 1099 assert(!Quals.hasObjCGCAttr() && 1100 "Type cannot have multiple ObjCGCs!"); 1101 Quals.addObjCGCAttr(GCAttr); 1102 1103 return getExtQualType(TypeNode, Quals); 1104} 1105 1106QualType ASTContext::getNoReturnType(QualType T) { 1107 QualType ResultType; 1108 if (T->isPointerType()) { 1109 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1110 ResultType = getNoReturnType(Pointee); 1111 ResultType = getPointerType(ResultType); 1112 } else if (T->isBlockPointerType()) { 1113 QualType Pointee = T->getAs<BlockPointerType>()->getPointeeType(); 1114 ResultType = getNoReturnType(Pointee); 1115 ResultType = getBlockPointerType(ResultType); 1116 } else { 1117 assert (T->isFunctionType() 1118 && "can't noreturn qualify non-pointer to function or block type"); 1119 1120 if (const FunctionNoProtoType *FNPT = T->getAs<FunctionNoProtoType>()) { 1121 ResultType = getFunctionNoProtoType(FNPT->getResultType(), true); 1122 } else { 1123 const FunctionProtoType *F = T->getAs<FunctionProtoType>(); 1124 ResultType 1125 = getFunctionType(F->getResultType(), F->arg_type_begin(), 1126 F->getNumArgs(), F->isVariadic(), F->getTypeQuals(), 1127 F->hasExceptionSpec(), F->hasAnyExceptionSpec(), 1128 F->getNumExceptions(), F->exception_begin(), true); 1129 } 1130 } 1131 1132 return getQualifiedType(ResultType, T.getQualifiers()); 1133} 1134 1135/// getComplexType - Return the uniqued reference to the type for a complex 1136/// number with the specified element type. 1137QualType ASTContext::getComplexType(QualType T) { 1138 // Unique pointers, to guarantee there is only one pointer of a particular 1139 // structure. 1140 llvm::FoldingSetNodeID ID; 1141 ComplexType::Profile(ID, T); 1142 1143 void *InsertPos = 0; 1144 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1145 return QualType(CT, 0); 1146 1147 // If the pointee type isn't canonical, this won't be a canonical type either, 1148 // so fill in the canonical type field. 1149 QualType Canonical; 1150 if (!T.isCanonical()) { 1151 Canonical = getComplexType(getCanonicalType(T)); 1152 1153 // Get the new insert position for the node we care about. 1154 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1155 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1156 } 1157 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1158 Types.push_back(New); 1159 ComplexTypes.InsertNode(New, InsertPos); 1160 return QualType(New, 0); 1161} 1162 1163QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1164 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1165 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1166 FixedWidthIntType *&Entry = Map[Width]; 1167 if (!Entry) 1168 Entry = new FixedWidthIntType(Width, Signed); 1169 return QualType(Entry, 0); 1170} 1171 1172/// getPointerType - Return the uniqued reference to the type for a pointer to 1173/// the specified type. 1174QualType ASTContext::getPointerType(QualType T) { 1175 // Unique pointers, to guarantee there is only one pointer of a particular 1176 // structure. 1177 llvm::FoldingSetNodeID ID; 1178 PointerType::Profile(ID, T); 1179 1180 void *InsertPos = 0; 1181 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1182 return QualType(PT, 0); 1183 1184 // If the pointee type isn't canonical, this won't be a canonical type either, 1185 // so fill in the canonical type field. 1186 QualType Canonical; 1187 if (!T.isCanonical()) { 1188 Canonical = getPointerType(getCanonicalType(T)); 1189 1190 // Get the new insert position for the node we care about. 1191 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1192 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1193 } 1194 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1195 Types.push_back(New); 1196 PointerTypes.InsertNode(New, InsertPos); 1197 return QualType(New, 0); 1198} 1199 1200/// getBlockPointerType - Return the uniqued reference to the type for 1201/// a pointer to the specified block. 1202QualType ASTContext::getBlockPointerType(QualType T) { 1203 assert(T->isFunctionType() && "block of function types only"); 1204 // Unique pointers, to guarantee there is only one block of a particular 1205 // structure. 1206 llvm::FoldingSetNodeID ID; 1207 BlockPointerType::Profile(ID, T); 1208 1209 void *InsertPos = 0; 1210 if (BlockPointerType *PT = 1211 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1212 return QualType(PT, 0); 1213 1214 // If the block pointee type isn't canonical, this won't be a canonical 1215 // type either so fill in the canonical type field. 1216 QualType Canonical; 1217 if (!T.isCanonical()) { 1218 Canonical = getBlockPointerType(getCanonicalType(T)); 1219 1220 // Get the new insert position for the node we care about. 1221 BlockPointerType *NewIP = 1222 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1223 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1224 } 1225 BlockPointerType *New 1226 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1227 Types.push_back(New); 1228 BlockPointerTypes.InsertNode(New, InsertPos); 1229 return QualType(New, 0); 1230} 1231 1232/// getLValueReferenceType - Return the uniqued reference to the type for an 1233/// lvalue reference to the specified type. 1234QualType ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) { 1235 // Unique pointers, to guarantee there is only one pointer of a particular 1236 // structure. 1237 llvm::FoldingSetNodeID ID; 1238 ReferenceType::Profile(ID, T, SpelledAsLValue); 1239 1240 void *InsertPos = 0; 1241 if (LValueReferenceType *RT = 1242 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1243 return QualType(RT, 0); 1244 1245 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1246 1247 // If the referencee type isn't canonical, this won't be a canonical type 1248 // either, so fill in the canonical type field. 1249 QualType Canonical; 1250 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1251 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1252 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1253 1254 // Get the new insert position for the node we care about. 1255 LValueReferenceType *NewIP = 1256 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1257 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1258 } 1259 1260 LValueReferenceType *New 1261 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1262 SpelledAsLValue); 1263 Types.push_back(New); 1264 LValueReferenceTypes.InsertNode(New, InsertPos); 1265 1266 return QualType(New, 0); 1267} 1268 1269/// getRValueReferenceType - Return the uniqued reference to the type for an 1270/// rvalue reference to the specified type. 1271QualType ASTContext::getRValueReferenceType(QualType T) { 1272 // Unique pointers, to guarantee there is only one pointer of a particular 1273 // structure. 1274 llvm::FoldingSetNodeID ID; 1275 ReferenceType::Profile(ID, T, false); 1276 1277 void *InsertPos = 0; 1278 if (RValueReferenceType *RT = 1279 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1280 return QualType(RT, 0); 1281 1282 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1283 1284 // If the referencee type isn't canonical, this won't be a canonical type 1285 // either, so fill in the canonical type field. 1286 QualType Canonical; 1287 if (InnerRef || !T.isCanonical()) { 1288 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1289 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1290 1291 // Get the new insert position for the node we care about. 1292 RValueReferenceType *NewIP = 1293 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1294 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1295 } 1296 1297 RValueReferenceType *New 1298 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1299 Types.push_back(New); 1300 RValueReferenceTypes.InsertNode(New, InsertPos); 1301 return QualType(New, 0); 1302} 1303 1304/// getMemberPointerType - Return the uniqued reference to the type for a 1305/// member pointer to the specified type, in the specified class. 1306QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1307 // Unique pointers, to guarantee there is only one pointer of a particular 1308 // structure. 1309 llvm::FoldingSetNodeID ID; 1310 MemberPointerType::Profile(ID, T, Cls); 1311 1312 void *InsertPos = 0; 1313 if (MemberPointerType *PT = 1314 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1315 return QualType(PT, 0); 1316 1317 // If the pointee or class type isn't canonical, this won't be a canonical 1318 // type either, so fill in the canonical type field. 1319 QualType Canonical; 1320 if (!T.isCanonical()) { 1321 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1322 1323 // Get the new insert position for the node we care about. 1324 MemberPointerType *NewIP = 1325 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1326 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1327 } 1328 MemberPointerType *New 1329 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1330 Types.push_back(New); 1331 MemberPointerTypes.InsertNode(New, InsertPos); 1332 return QualType(New, 0); 1333} 1334 1335/// getConstantArrayType - Return the unique reference to the type for an 1336/// array of the specified element type. 1337QualType ASTContext::getConstantArrayType(QualType EltTy, 1338 const llvm::APInt &ArySizeIn, 1339 ArrayType::ArraySizeModifier ASM, 1340 unsigned EltTypeQuals) { 1341 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1342 "Constant array of VLAs is illegal!"); 1343 1344 // Convert the array size into a canonical width matching the pointer size for 1345 // the target. 1346 llvm::APInt ArySize(ArySizeIn); 1347 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1348 1349 llvm::FoldingSetNodeID ID; 1350 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1351 1352 void *InsertPos = 0; 1353 if (ConstantArrayType *ATP = 1354 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1355 return QualType(ATP, 0); 1356 1357 // If the element type isn't canonical, this won't be a canonical type either, 1358 // so fill in the canonical type field. 1359 QualType Canonical; 1360 if (!EltTy.isCanonical()) { 1361 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1362 ASM, EltTypeQuals); 1363 // Get the new insert position for the node we care about. 1364 ConstantArrayType *NewIP = 1365 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1366 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1367 } 1368 1369 ConstantArrayType *New = new(*this,TypeAlignment) 1370 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1371 ConstantArrayTypes.InsertNode(New, InsertPos); 1372 Types.push_back(New); 1373 return QualType(New, 0); 1374} 1375 1376/// getVariableArrayType - Returns a non-unique reference to the type for a 1377/// variable array of the specified element type. 1378QualType ASTContext::getVariableArrayType(QualType EltTy, 1379 Expr *NumElts, 1380 ArrayType::ArraySizeModifier ASM, 1381 unsigned EltTypeQuals, 1382 SourceRange Brackets) { 1383 // Since we don't unique expressions, it isn't possible to unique VLA's 1384 // that have an expression provided for their size. 1385 1386 VariableArrayType *New = new(*this, TypeAlignment) 1387 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1388 1389 VariableArrayTypes.push_back(New); 1390 Types.push_back(New); 1391 return QualType(New, 0); 1392} 1393 1394/// getDependentSizedArrayType - Returns a non-unique reference to 1395/// the type for a dependently-sized array of the specified element 1396/// type. 1397QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1398 Expr *NumElts, 1399 ArrayType::ArraySizeModifier ASM, 1400 unsigned EltTypeQuals, 1401 SourceRange Brackets) { 1402 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1403 "Size must be type- or value-dependent!"); 1404 1405 llvm::FoldingSetNodeID ID; 1406 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1407 EltTypeQuals, NumElts); 1408 1409 void *InsertPos = 0; 1410 DependentSizedArrayType *Canon 1411 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1412 DependentSizedArrayType *New; 1413 if (Canon) { 1414 // We already have a canonical version of this array type; use it as 1415 // the canonical type for a newly-built type. 1416 New = new (*this, TypeAlignment) 1417 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1418 NumElts, ASM, EltTypeQuals, Brackets); 1419 } else { 1420 QualType CanonEltTy = getCanonicalType(EltTy); 1421 if (CanonEltTy == EltTy) { 1422 New = new (*this, TypeAlignment) 1423 DependentSizedArrayType(*this, EltTy, QualType(), 1424 NumElts, ASM, EltTypeQuals, Brackets); 1425 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1426 } else { 1427 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1428 ASM, EltTypeQuals, 1429 SourceRange()); 1430 New = new (*this, TypeAlignment) 1431 DependentSizedArrayType(*this, EltTy, Canon, 1432 NumElts, ASM, EltTypeQuals, Brackets); 1433 } 1434 } 1435 1436 Types.push_back(New); 1437 return QualType(New, 0); 1438} 1439 1440QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1441 ArrayType::ArraySizeModifier ASM, 1442 unsigned EltTypeQuals) { 1443 llvm::FoldingSetNodeID ID; 1444 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1445 1446 void *InsertPos = 0; 1447 if (IncompleteArrayType *ATP = 1448 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1449 return QualType(ATP, 0); 1450 1451 // If the element type isn't canonical, this won't be a canonical type 1452 // either, so fill in the canonical type field. 1453 QualType Canonical; 1454 1455 if (!EltTy.isCanonical()) { 1456 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1457 ASM, EltTypeQuals); 1458 1459 // Get the new insert position for the node we care about. 1460 IncompleteArrayType *NewIP = 1461 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1462 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1463 } 1464 1465 IncompleteArrayType *New = new (*this, TypeAlignment) 1466 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1467 1468 IncompleteArrayTypes.InsertNode(New, InsertPos); 1469 Types.push_back(New); 1470 return QualType(New, 0); 1471} 1472 1473/// getVectorType - Return the unique reference to a vector type of 1474/// the specified element type and size. VectorType must be a built-in type. 1475QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1476 BuiltinType *baseType; 1477 1478 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1479 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1480 1481 // Check if we've already instantiated a vector of this type. 1482 llvm::FoldingSetNodeID ID; 1483 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1484 void *InsertPos = 0; 1485 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1486 return QualType(VTP, 0); 1487 1488 // If the element type isn't canonical, this won't be a canonical type either, 1489 // so fill in the canonical type field. 1490 QualType Canonical; 1491 if (!vecType.isCanonical()) { 1492 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1493 1494 // Get the new insert position for the node we care about. 1495 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1496 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1497 } 1498 VectorType *New = new (*this, TypeAlignment) 1499 VectorType(vecType, NumElts, Canonical); 1500 VectorTypes.InsertNode(New, InsertPos); 1501 Types.push_back(New); 1502 return QualType(New, 0); 1503} 1504 1505/// getExtVectorType - Return the unique reference to an extended vector type of 1506/// the specified element type and size. VectorType must be a built-in type. 1507QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1508 BuiltinType *baseType; 1509 1510 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1511 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1512 1513 // Check if we've already instantiated a vector of this type. 1514 llvm::FoldingSetNodeID ID; 1515 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1516 void *InsertPos = 0; 1517 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1518 return QualType(VTP, 0); 1519 1520 // If the element type isn't canonical, this won't be a canonical type either, 1521 // so fill in the canonical type field. 1522 QualType Canonical; 1523 if (!vecType.isCanonical()) { 1524 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1525 1526 // Get the new insert position for the node we care about. 1527 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1528 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1529 } 1530 ExtVectorType *New = new (*this, TypeAlignment) 1531 ExtVectorType(vecType, NumElts, Canonical); 1532 VectorTypes.InsertNode(New, InsertPos); 1533 Types.push_back(New); 1534 return QualType(New, 0); 1535} 1536 1537QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1538 Expr *SizeExpr, 1539 SourceLocation AttrLoc) { 1540 llvm::FoldingSetNodeID ID; 1541 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1542 SizeExpr); 1543 1544 void *InsertPos = 0; 1545 DependentSizedExtVectorType *Canon 1546 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1547 DependentSizedExtVectorType *New; 1548 if (Canon) { 1549 // We already have a canonical version of this array type; use it as 1550 // the canonical type for a newly-built type. 1551 New = new (*this, TypeAlignment) 1552 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1553 SizeExpr, AttrLoc); 1554 } else { 1555 QualType CanonVecTy = getCanonicalType(vecType); 1556 if (CanonVecTy == vecType) { 1557 New = new (*this, TypeAlignment) 1558 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1559 AttrLoc); 1560 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1561 } else { 1562 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1563 SourceLocation()); 1564 New = new (*this, TypeAlignment) 1565 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1566 } 1567 } 1568 1569 Types.push_back(New); 1570 return QualType(New, 0); 1571} 1572 1573/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1574/// 1575QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1576 // Unique functions, to guarantee there is only one function of a particular 1577 // structure. 1578 llvm::FoldingSetNodeID ID; 1579 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1580 1581 void *InsertPos = 0; 1582 if (FunctionNoProtoType *FT = 1583 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1584 return QualType(FT, 0); 1585 1586 QualType Canonical; 1587 if (!ResultTy.isCanonical()) { 1588 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1589 1590 // Get the new insert position for the node we care about. 1591 FunctionNoProtoType *NewIP = 1592 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1593 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1594 } 1595 1596 FunctionNoProtoType *New = new (*this, TypeAlignment) 1597 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1598 Types.push_back(New); 1599 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1600 return QualType(New, 0); 1601} 1602 1603/// getFunctionType - Return a normal function type with a typed argument 1604/// list. isVariadic indicates whether the argument list includes '...'. 1605QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1606 unsigned NumArgs, bool isVariadic, 1607 unsigned TypeQuals, bool hasExceptionSpec, 1608 bool hasAnyExceptionSpec, unsigned NumExs, 1609 const QualType *ExArray, bool NoReturn) { 1610 // Unique functions, to guarantee there is only one function of a particular 1611 // structure. 1612 llvm::FoldingSetNodeID ID; 1613 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1614 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1615 NumExs, ExArray, NoReturn); 1616 1617 void *InsertPos = 0; 1618 if (FunctionProtoType *FTP = 1619 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1620 return QualType(FTP, 0); 1621 1622 // Determine whether the type being created is already canonical or not. 1623 bool isCanonical = !hasExceptionSpec && ResultTy.isCanonical(); 1624 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1625 if (!ArgArray[i].isCanonicalAsParam()) 1626 isCanonical = false; 1627 1628 // If this type isn't canonical, get the canonical version of it. 1629 // The exception spec is not part of the canonical type. 1630 QualType Canonical; 1631 if (!isCanonical) { 1632 llvm::SmallVector<QualType, 16> CanonicalArgs; 1633 CanonicalArgs.reserve(NumArgs); 1634 for (unsigned i = 0; i != NumArgs; ++i) 1635 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1636 1637 Canonical = getFunctionType(getCanonicalType(ResultTy), 1638 CanonicalArgs.data(), NumArgs, 1639 isVariadic, TypeQuals, false, 1640 false, 0, 0, NoReturn); 1641 1642 // Get the new insert position for the node we care about. 1643 FunctionProtoType *NewIP = 1644 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1645 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1646 } 1647 1648 // FunctionProtoType objects are allocated with extra bytes after them 1649 // for two variable size arrays (for parameter and exception types) at the 1650 // end of them. 1651 FunctionProtoType *FTP = 1652 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1653 NumArgs*sizeof(QualType) + 1654 NumExs*sizeof(QualType), TypeAlignment); 1655 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1656 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1657 ExArray, NumExs, Canonical, NoReturn); 1658 Types.push_back(FTP); 1659 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1660 return QualType(FTP, 0); 1661} 1662 1663/// getTypeDeclType - Return the unique reference to the type for the 1664/// specified type declaration. 1665QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1666 assert(Decl && "Passed null for Decl param"); 1667 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1668 1669 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1670 return getTypedefType(Typedef); 1671 else if (isa<TemplateTypeParmDecl>(Decl)) { 1672 assert(false && "Template type parameter types are always available."); 1673 } else if (ObjCInterfaceDecl *ObjCInterface 1674 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1675 return getObjCInterfaceType(ObjCInterface); 1676 1677 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1678 if (PrevDecl) 1679 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1680 else 1681 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1682 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1683 if (PrevDecl) 1684 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1685 else 1686 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1687 } else 1688 assert(false && "TypeDecl without a type?"); 1689 1690 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1691 return QualType(Decl->TypeForDecl, 0); 1692} 1693 1694/// getTypedefType - Return the unique reference to the type for the 1695/// specified typename decl. 1696QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1697 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1698 1699 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1700 Decl->TypeForDecl = new(*this, TypeAlignment) 1701 TypedefType(Type::Typedef, Decl, Canonical); 1702 Types.push_back(Decl->TypeForDecl); 1703 return QualType(Decl->TypeForDecl, 0); 1704} 1705 1706/// \brief Retrieve a substitution-result type. 1707QualType 1708ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1709 QualType Replacement) { 1710 assert(Replacement.isCanonical() 1711 && "replacement types must always be canonical"); 1712 1713 llvm::FoldingSetNodeID ID; 1714 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1715 void *InsertPos = 0; 1716 SubstTemplateTypeParmType *SubstParm 1717 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1718 1719 if (!SubstParm) { 1720 SubstParm = new (*this, TypeAlignment) 1721 SubstTemplateTypeParmType(Parm, Replacement); 1722 Types.push_back(SubstParm); 1723 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1724 } 1725 1726 return QualType(SubstParm, 0); 1727} 1728 1729/// \brief Retrieve the template type parameter type for a template 1730/// parameter or parameter pack with the given depth, index, and (optionally) 1731/// name. 1732QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1733 bool ParameterPack, 1734 IdentifierInfo *Name) { 1735 llvm::FoldingSetNodeID ID; 1736 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1737 void *InsertPos = 0; 1738 TemplateTypeParmType *TypeParm 1739 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1740 1741 if (TypeParm) 1742 return QualType(TypeParm, 0); 1743 1744 if (Name) { 1745 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1746 TypeParm = new (*this, TypeAlignment) 1747 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1748 } else 1749 TypeParm = new (*this, TypeAlignment) 1750 TemplateTypeParmType(Depth, Index, ParameterPack); 1751 1752 Types.push_back(TypeParm); 1753 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1754 1755 return QualType(TypeParm, 0); 1756} 1757 1758QualType 1759ASTContext::getTemplateSpecializationType(TemplateName Template, 1760 const TemplateArgument *Args, 1761 unsigned NumArgs, 1762 QualType Canon) { 1763 if (!Canon.isNull()) 1764 Canon = getCanonicalType(Canon); 1765 else { 1766 // Build the canonical template specialization type. 1767 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1768 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1769 CanonArgs.reserve(NumArgs); 1770 for (unsigned I = 0; I != NumArgs; ++I) 1771 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1772 1773 // Determine whether this canonical template specialization type already 1774 // exists. 1775 llvm::FoldingSetNodeID ID; 1776 TemplateSpecializationType::Profile(ID, CanonTemplate, 1777 CanonArgs.data(), NumArgs, *this); 1778 1779 void *InsertPos = 0; 1780 TemplateSpecializationType *Spec 1781 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1782 1783 if (!Spec) { 1784 // Allocate a new canonical template specialization type. 1785 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1786 sizeof(TemplateArgument) * NumArgs), 1787 TypeAlignment); 1788 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1789 CanonArgs.data(), NumArgs, 1790 Canon); 1791 Types.push_back(Spec); 1792 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1793 } 1794 1795 if (Canon.isNull()) 1796 Canon = QualType(Spec, 0); 1797 assert(Canon->isDependentType() && 1798 "Non-dependent template-id type must have a canonical type"); 1799 } 1800 1801 // Allocate the (non-canonical) template specialization type, but don't 1802 // try to unique it: these types typically have location information that 1803 // we don't unique and don't want to lose. 1804 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1805 sizeof(TemplateArgument) * NumArgs), 1806 TypeAlignment); 1807 TemplateSpecializationType *Spec 1808 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1809 Canon); 1810 1811 Types.push_back(Spec); 1812 return QualType(Spec, 0); 1813} 1814 1815QualType 1816ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1817 QualType NamedType) { 1818 llvm::FoldingSetNodeID ID; 1819 QualifiedNameType::Profile(ID, NNS, NamedType); 1820 1821 void *InsertPos = 0; 1822 QualifiedNameType *T 1823 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1824 if (T) 1825 return QualType(T, 0); 1826 1827 T = new (*this) QualifiedNameType(NNS, NamedType, 1828 getCanonicalType(NamedType)); 1829 Types.push_back(T); 1830 QualifiedNameTypes.InsertNode(T, InsertPos); 1831 return QualType(T, 0); 1832} 1833 1834QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1835 const IdentifierInfo *Name, 1836 QualType Canon) { 1837 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1838 1839 if (Canon.isNull()) { 1840 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1841 if (CanonNNS != NNS) 1842 Canon = getTypenameType(CanonNNS, Name); 1843 } 1844 1845 llvm::FoldingSetNodeID ID; 1846 TypenameType::Profile(ID, NNS, Name); 1847 1848 void *InsertPos = 0; 1849 TypenameType *T 1850 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1851 if (T) 1852 return QualType(T, 0); 1853 1854 T = new (*this) TypenameType(NNS, Name, Canon); 1855 Types.push_back(T); 1856 TypenameTypes.InsertNode(T, InsertPos); 1857 return QualType(T, 0); 1858} 1859 1860QualType 1861ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1862 const TemplateSpecializationType *TemplateId, 1863 QualType Canon) { 1864 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1865 1866 if (Canon.isNull()) { 1867 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1868 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1869 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1870 const TemplateSpecializationType *CanonTemplateId 1871 = CanonType->getAs<TemplateSpecializationType>(); 1872 assert(CanonTemplateId && 1873 "Canonical type must also be a template specialization type"); 1874 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1875 } 1876 } 1877 1878 llvm::FoldingSetNodeID ID; 1879 TypenameType::Profile(ID, NNS, TemplateId); 1880 1881 void *InsertPos = 0; 1882 TypenameType *T 1883 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1884 if (T) 1885 return QualType(T, 0); 1886 1887 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1888 Types.push_back(T); 1889 TypenameTypes.InsertNode(T, InsertPos); 1890 return QualType(T, 0); 1891} 1892 1893QualType 1894ASTContext::getElaboratedType(QualType UnderlyingType, 1895 ElaboratedType::TagKind Tag) { 1896 llvm::FoldingSetNodeID ID; 1897 ElaboratedType::Profile(ID, UnderlyingType, Tag); 1898 1899 void *InsertPos = 0; 1900 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 1901 if (T) 1902 return QualType(T, 0); 1903 1904 QualType Canon = getCanonicalType(UnderlyingType); 1905 1906 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 1907 Types.push_back(T); 1908 ElaboratedTypes.InsertNode(T, InsertPos); 1909 return QualType(T, 0); 1910} 1911 1912/// CmpProtocolNames - Comparison predicate for sorting protocols 1913/// alphabetically. 1914static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1915 const ObjCProtocolDecl *RHS) { 1916 return LHS->getDeclName() < RHS->getDeclName(); 1917} 1918 1919static bool areSortedAndUniqued(ObjCProtocolDecl **Protocols, 1920 unsigned NumProtocols) { 1921 if (NumProtocols == 0) return true; 1922 1923 for (unsigned i = 1; i != NumProtocols; ++i) 1924 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 1925 return false; 1926 return true; 1927} 1928 1929static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 1930 unsigned &NumProtocols) { 1931 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1932 1933 // Sort protocols, keyed by name. 1934 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1935 1936 // Remove duplicates. 1937 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1938 NumProtocols = ProtocolsEnd-Protocols; 1939} 1940 1941/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1942/// the given interface decl and the conforming protocol list. 1943QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1944 ObjCProtocolDecl **Protocols, 1945 unsigned NumProtocols) { 1946 llvm::FoldingSetNodeID ID; 1947 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1948 1949 void *InsertPos = 0; 1950 if (ObjCObjectPointerType *QT = 1951 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1952 return QualType(QT, 0); 1953 1954 // Sort the protocol list alphabetically to canonicalize it. 1955 QualType Canonical; 1956 if (!InterfaceT.isCanonical() || 1957 !areSortedAndUniqued(Protocols, NumProtocols)) { 1958 if (!areSortedAndUniqued(Protocols, NumProtocols)) { 1959 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 1960 unsigned UniqueCount = NumProtocols; 1961 1962 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 1963 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 1964 1965 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 1966 &Sorted[0], UniqueCount); 1967 } else { 1968 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 1969 Protocols, NumProtocols); 1970 } 1971 1972 // Regenerate InsertPos. 1973 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1974 } 1975 1976 // No Match; 1977 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 1978 ObjCObjectPointerType(Canonical, InterfaceT, Protocols, NumProtocols); 1979 1980 Types.push_back(QType); 1981 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1982 return QualType(QType, 0); 1983} 1984 1985/// getObjCInterfaceType - Return the unique reference to the type for the 1986/// specified ObjC interface decl. The list of protocols is optional. 1987QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1988 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1989 llvm::FoldingSetNodeID ID; 1990 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1991 1992 void *InsertPos = 0; 1993 if (ObjCInterfaceType *QT = 1994 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1995 return QualType(QT, 0); 1996 1997 // Sort the protocol list alphabetically to canonicalize it. 1998 QualType Canonical; 1999 if (NumProtocols && !areSortedAndUniqued(Protocols, NumProtocols)) { 2000 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2001 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2002 2003 unsigned UniqueCount = NumProtocols; 2004 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2005 2006 Canonical = getObjCInterfaceType(Decl, &Sorted[0], UniqueCount); 2007 2008 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos); 2009 } 2010 2011 ObjCInterfaceType *QType = new (*this, TypeAlignment) 2012 ObjCInterfaceType(Canonical, const_cast<ObjCInterfaceDecl*>(Decl), 2013 Protocols, NumProtocols); 2014 2015 Types.push_back(QType); 2016 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 2017 return QualType(QType, 0); 2018} 2019 2020/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2021/// TypeOfExprType AST's (since expression's are never shared). For example, 2022/// multiple declarations that refer to "typeof(x)" all contain different 2023/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2024/// on canonical type's (which are always unique). 2025QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2026 TypeOfExprType *toe; 2027 if (tofExpr->isTypeDependent()) { 2028 llvm::FoldingSetNodeID ID; 2029 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2030 2031 void *InsertPos = 0; 2032 DependentTypeOfExprType *Canon 2033 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2034 if (Canon) { 2035 // We already have a "canonical" version of an identical, dependent 2036 // typeof(expr) type. Use that as our canonical type. 2037 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2038 QualType((TypeOfExprType*)Canon, 0)); 2039 } 2040 else { 2041 // Build a new, canonical typeof(expr) type. 2042 Canon 2043 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2044 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2045 toe = Canon; 2046 } 2047 } else { 2048 QualType Canonical = getCanonicalType(tofExpr->getType()); 2049 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2050 } 2051 Types.push_back(toe); 2052 return QualType(toe, 0); 2053} 2054 2055/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2056/// TypeOfType AST's. The only motivation to unique these nodes would be 2057/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2058/// an issue. This doesn't effect the type checker, since it operates 2059/// on canonical type's (which are always unique). 2060QualType ASTContext::getTypeOfType(QualType tofType) { 2061 QualType Canonical = getCanonicalType(tofType); 2062 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2063 Types.push_back(tot); 2064 return QualType(tot, 0); 2065} 2066 2067/// getDecltypeForExpr - Given an expr, will return the decltype for that 2068/// expression, according to the rules in C++0x [dcl.type.simple]p4 2069static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2070 if (e->isTypeDependent()) 2071 return Context.DependentTy; 2072 2073 // If e is an id expression or a class member access, decltype(e) is defined 2074 // as the type of the entity named by e. 2075 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2076 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2077 return VD->getType(); 2078 } 2079 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2080 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2081 return FD->getType(); 2082 } 2083 // If e is a function call or an invocation of an overloaded operator, 2084 // (parentheses around e are ignored), decltype(e) is defined as the 2085 // return type of that function. 2086 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2087 return CE->getCallReturnType(); 2088 2089 QualType T = e->getType(); 2090 2091 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2092 // defined as T&, otherwise decltype(e) is defined as T. 2093 if (e->isLvalue(Context) == Expr::LV_Valid) 2094 T = Context.getLValueReferenceType(T); 2095 2096 return T; 2097} 2098 2099/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2100/// DecltypeType AST's. The only motivation to unique these nodes would be 2101/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2102/// an issue. This doesn't effect the type checker, since it operates 2103/// on canonical type's (which are always unique). 2104QualType ASTContext::getDecltypeType(Expr *e) { 2105 DecltypeType *dt; 2106 if (e->isTypeDependent()) { 2107 llvm::FoldingSetNodeID ID; 2108 DependentDecltypeType::Profile(ID, *this, e); 2109 2110 void *InsertPos = 0; 2111 DependentDecltypeType *Canon 2112 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2113 if (Canon) { 2114 // We already have a "canonical" version of an equivalent, dependent 2115 // decltype type. Use that as our canonical type. 2116 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2117 QualType((DecltypeType*)Canon, 0)); 2118 } 2119 else { 2120 // Build a new, canonical typeof(expr) type. 2121 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2122 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2123 dt = Canon; 2124 } 2125 } else { 2126 QualType T = getDecltypeForExpr(e, *this); 2127 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2128 } 2129 Types.push_back(dt); 2130 return QualType(dt, 0); 2131} 2132 2133/// getTagDeclType - Return the unique reference to the type for the 2134/// specified TagDecl (struct/union/class/enum) decl. 2135QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2136 assert (Decl); 2137 // FIXME: What is the design on getTagDeclType when it requires casting 2138 // away const? mutable? 2139 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2140} 2141 2142/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2143/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2144/// needs to agree with the definition in <stddef.h>. 2145QualType ASTContext::getSizeType() const { 2146 return getFromTargetType(Target.getSizeType()); 2147} 2148 2149/// getSignedWCharType - Return the type of "signed wchar_t". 2150/// Used when in C++, as a GCC extension. 2151QualType ASTContext::getSignedWCharType() const { 2152 // FIXME: derive from "Target" ? 2153 return WCharTy; 2154} 2155 2156/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2157/// Used when in C++, as a GCC extension. 2158QualType ASTContext::getUnsignedWCharType() const { 2159 // FIXME: derive from "Target" ? 2160 return UnsignedIntTy; 2161} 2162 2163/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2164/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2165QualType ASTContext::getPointerDiffType() const { 2166 return getFromTargetType(Target.getPtrDiffType(0)); 2167} 2168 2169//===----------------------------------------------------------------------===// 2170// Type Operators 2171//===----------------------------------------------------------------------===// 2172 2173CanQualType ASTContext::getCanonicalParamType(QualType T) { 2174 // Push qualifiers into arrays, and then discard any remaining 2175 // qualifiers. 2176 T = getCanonicalType(T); 2177 const Type *Ty = T.getTypePtr(); 2178 2179 QualType Result; 2180 if (isa<ArrayType>(Ty)) { 2181 Result = getArrayDecayedType(QualType(Ty,0)); 2182 } else if (isa<FunctionType>(Ty)) { 2183 Result = getPointerType(QualType(Ty, 0)); 2184 } else { 2185 Result = QualType(Ty, 0); 2186 } 2187 2188 return CanQualType::CreateUnsafe(Result); 2189} 2190 2191/// getCanonicalType - Return the canonical (structural) type corresponding to 2192/// the specified potentially non-canonical type. The non-canonical version 2193/// of a type may have many "decorated" versions of types. Decorators can 2194/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2195/// to be free of any of these, allowing two canonical types to be compared 2196/// for exact equality with a simple pointer comparison. 2197CanQualType ASTContext::getCanonicalType(QualType T) { 2198 QualifierCollector Quals; 2199 const Type *Ptr = Quals.strip(T); 2200 QualType CanType = Ptr->getCanonicalTypeInternal(); 2201 2202 // The canonical internal type will be the canonical type *except* 2203 // that we push type qualifiers down through array types. 2204 2205 // If there are no new qualifiers to push down, stop here. 2206 if (!Quals.hasQualifiers()) 2207 return CanQualType::CreateUnsafe(CanType); 2208 2209 // If the type qualifiers are on an array type, get the canonical 2210 // type of the array with the qualifiers applied to the element 2211 // type. 2212 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2213 if (!AT) 2214 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2215 2216 // Get the canonical version of the element with the extra qualifiers on it. 2217 // This can recursively sink qualifiers through multiple levels of arrays. 2218 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2219 NewEltTy = getCanonicalType(NewEltTy); 2220 2221 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2222 return CanQualType::CreateUnsafe( 2223 getConstantArrayType(NewEltTy, CAT->getSize(), 2224 CAT->getSizeModifier(), 2225 CAT->getIndexTypeCVRQualifiers())); 2226 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2227 return CanQualType::CreateUnsafe( 2228 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2229 IAT->getIndexTypeCVRQualifiers())); 2230 2231 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2232 return CanQualType::CreateUnsafe( 2233 getDependentSizedArrayType(NewEltTy, 2234 DSAT->getSizeExpr() ? 2235 DSAT->getSizeExpr()->Retain() : 0, 2236 DSAT->getSizeModifier(), 2237 DSAT->getIndexTypeCVRQualifiers(), 2238 DSAT->getBracketsRange())); 2239 2240 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2241 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2242 VAT->getSizeExpr() ? 2243 VAT->getSizeExpr()->Retain() : 0, 2244 VAT->getSizeModifier(), 2245 VAT->getIndexTypeCVRQualifiers(), 2246 VAT->getBracketsRange())); 2247} 2248 2249TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2250 // If this template name refers to a template, the canonical 2251 // template name merely stores the template itself. 2252 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2253 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2254 2255 // If this template name refers to a set of overloaded function templates, 2256 /// the canonical template name merely stores the set of function templates. 2257 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) { 2258 OverloadedFunctionDecl *CanonOvl = 0; 2259 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 2260 FEnd = Ovl->function_end(); 2261 F != FEnd; ++F) { 2262 Decl *Canon = F->get()->getCanonicalDecl(); 2263 if (CanonOvl || Canon != F->get()) { 2264 if (!CanonOvl) 2265 CanonOvl = OverloadedFunctionDecl::Create(*this, 2266 Ovl->getDeclContext(), 2267 Ovl->getDeclName()); 2268 2269 CanonOvl->addOverload( 2270 AnyFunctionDecl::getFromNamedDecl(cast<NamedDecl>(Canon))); 2271 } 2272 } 2273 2274 return TemplateName(CanonOvl? CanonOvl : Ovl); 2275 } 2276 2277 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2278 assert(DTN && "Non-dependent template names must refer to template decls."); 2279 return DTN->CanonicalTemplateName; 2280} 2281 2282TemplateArgument 2283ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2284 switch (Arg.getKind()) { 2285 case TemplateArgument::Null: 2286 return Arg; 2287 2288 case TemplateArgument::Expression: 2289 // FIXME: Build canonical expression? 2290 return Arg; 2291 2292 case TemplateArgument::Declaration: 2293 return TemplateArgument(SourceLocation(), 2294 Arg.getAsDecl()->getCanonicalDecl()); 2295 2296 case TemplateArgument::Integral: 2297 return TemplateArgument(SourceLocation(), 2298 *Arg.getAsIntegral(), 2299 getCanonicalType(Arg.getIntegralType())); 2300 2301 case TemplateArgument::Type: 2302 return TemplateArgument(SourceLocation(), 2303 getCanonicalType(Arg.getAsType())); 2304 2305 case TemplateArgument::Pack: { 2306 // FIXME: Allocate in ASTContext 2307 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2308 unsigned Idx = 0; 2309 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2310 AEnd = Arg.pack_end(); 2311 A != AEnd; (void)++A, ++Idx) 2312 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2313 2314 TemplateArgument Result; 2315 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2316 return Result; 2317 } 2318 } 2319 2320 // Silence GCC warning 2321 assert(false && "Unhandled template argument kind"); 2322 return TemplateArgument(); 2323} 2324 2325NestedNameSpecifier * 2326ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2327 if (!NNS) 2328 return 0; 2329 2330 switch (NNS->getKind()) { 2331 case NestedNameSpecifier::Identifier: 2332 // Canonicalize the prefix but keep the identifier the same. 2333 return NestedNameSpecifier::Create(*this, 2334 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2335 NNS->getAsIdentifier()); 2336 2337 case NestedNameSpecifier::Namespace: 2338 // A namespace is canonical; build a nested-name-specifier with 2339 // this namespace and no prefix. 2340 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2341 2342 case NestedNameSpecifier::TypeSpec: 2343 case NestedNameSpecifier::TypeSpecWithTemplate: { 2344 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2345 return NestedNameSpecifier::Create(*this, 0, 2346 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2347 T.getTypePtr()); 2348 } 2349 2350 case NestedNameSpecifier::Global: 2351 // The global specifier is canonical and unique. 2352 return NNS; 2353 } 2354 2355 // Required to silence a GCC warning 2356 return 0; 2357} 2358 2359 2360const ArrayType *ASTContext::getAsArrayType(QualType T) { 2361 // Handle the non-qualified case efficiently. 2362 if (!T.hasQualifiers()) { 2363 // Handle the common positive case fast. 2364 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2365 return AT; 2366 } 2367 2368 // Handle the common negative case fast. 2369 QualType CType = T->getCanonicalTypeInternal(); 2370 if (!isa<ArrayType>(CType)) 2371 return 0; 2372 2373 // Apply any qualifiers from the array type to the element type. This 2374 // implements C99 6.7.3p8: "If the specification of an array type includes 2375 // any type qualifiers, the element type is so qualified, not the array type." 2376 2377 // If we get here, we either have type qualifiers on the type, or we have 2378 // sugar such as a typedef in the way. If we have type qualifiers on the type 2379 // we must propagate them down into the element type. 2380 2381 QualifierCollector Qs; 2382 const Type *Ty = Qs.strip(T.getDesugaredType()); 2383 2384 // If we have a simple case, just return now. 2385 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2386 if (ATy == 0 || Qs.empty()) 2387 return ATy; 2388 2389 // Otherwise, we have an array and we have qualifiers on it. Push the 2390 // qualifiers into the array element type and return a new array type. 2391 // Get the canonical version of the element with the extra qualifiers on it. 2392 // This can recursively sink qualifiers through multiple levels of arrays. 2393 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2394 2395 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2396 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2397 CAT->getSizeModifier(), 2398 CAT->getIndexTypeCVRQualifiers())); 2399 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2400 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2401 IAT->getSizeModifier(), 2402 IAT->getIndexTypeCVRQualifiers())); 2403 2404 if (const DependentSizedArrayType *DSAT 2405 = dyn_cast<DependentSizedArrayType>(ATy)) 2406 return cast<ArrayType>( 2407 getDependentSizedArrayType(NewEltTy, 2408 DSAT->getSizeExpr() ? 2409 DSAT->getSizeExpr()->Retain() : 0, 2410 DSAT->getSizeModifier(), 2411 DSAT->getIndexTypeCVRQualifiers(), 2412 DSAT->getBracketsRange())); 2413 2414 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2415 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2416 VAT->getSizeExpr() ? 2417 VAT->getSizeExpr()->Retain() : 0, 2418 VAT->getSizeModifier(), 2419 VAT->getIndexTypeCVRQualifiers(), 2420 VAT->getBracketsRange())); 2421} 2422 2423 2424/// getArrayDecayedType - Return the properly qualified result of decaying the 2425/// specified array type to a pointer. This operation is non-trivial when 2426/// handling typedefs etc. The canonical type of "T" must be an array type, 2427/// this returns a pointer to a properly qualified element of the array. 2428/// 2429/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2430QualType ASTContext::getArrayDecayedType(QualType Ty) { 2431 // Get the element type with 'getAsArrayType' so that we don't lose any 2432 // typedefs in the element type of the array. This also handles propagation 2433 // of type qualifiers from the array type into the element type if present 2434 // (C99 6.7.3p8). 2435 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2436 assert(PrettyArrayType && "Not an array type!"); 2437 2438 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2439 2440 // int x[restrict 4] -> int *restrict 2441 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2442} 2443 2444QualType ASTContext::getBaseElementType(QualType QT) { 2445 QualifierCollector Qs; 2446 while (true) { 2447 const Type *UT = Qs.strip(QT); 2448 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2449 QT = AT->getElementType(); 2450 } else { 2451 return Qs.apply(QT); 2452 } 2453 } 2454} 2455 2456QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2457 QualType ElemTy = AT->getElementType(); 2458 2459 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2460 return getBaseElementType(AT); 2461 2462 return ElemTy; 2463} 2464 2465/// getConstantArrayElementCount - Returns number of constant array elements. 2466uint64_t 2467ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2468 uint64_t ElementCount = 1; 2469 do { 2470 ElementCount *= CA->getSize().getZExtValue(); 2471 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2472 } while (CA); 2473 return ElementCount; 2474} 2475 2476/// getFloatingRank - Return a relative rank for floating point types. 2477/// This routine will assert if passed a built-in type that isn't a float. 2478static FloatingRank getFloatingRank(QualType T) { 2479 if (const ComplexType *CT = T->getAs<ComplexType>()) 2480 return getFloatingRank(CT->getElementType()); 2481 2482 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2483 switch (T->getAs<BuiltinType>()->getKind()) { 2484 default: assert(0 && "getFloatingRank(): not a floating type"); 2485 case BuiltinType::Float: return FloatRank; 2486 case BuiltinType::Double: return DoubleRank; 2487 case BuiltinType::LongDouble: return LongDoubleRank; 2488 } 2489} 2490 2491/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2492/// point or a complex type (based on typeDomain/typeSize). 2493/// 'typeDomain' is a real floating point or complex type. 2494/// 'typeSize' is a real floating point or complex type. 2495QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2496 QualType Domain) const { 2497 FloatingRank EltRank = getFloatingRank(Size); 2498 if (Domain->isComplexType()) { 2499 switch (EltRank) { 2500 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2501 case FloatRank: return FloatComplexTy; 2502 case DoubleRank: return DoubleComplexTy; 2503 case LongDoubleRank: return LongDoubleComplexTy; 2504 } 2505 } 2506 2507 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2508 switch (EltRank) { 2509 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2510 case FloatRank: return FloatTy; 2511 case DoubleRank: return DoubleTy; 2512 case LongDoubleRank: return LongDoubleTy; 2513 } 2514} 2515 2516/// getFloatingTypeOrder - Compare the rank of the two specified floating 2517/// point types, ignoring the domain of the type (i.e. 'double' == 2518/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2519/// LHS < RHS, return -1. 2520int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2521 FloatingRank LHSR = getFloatingRank(LHS); 2522 FloatingRank RHSR = getFloatingRank(RHS); 2523 2524 if (LHSR == RHSR) 2525 return 0; 2526 if (LHSR > RHSR) 2527 return 1; 2528 return -1; 2529} 2530 2531/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2532/// routine will assert if passed a built-in type that isn't an integer or enum, 2533/// or if it is not canonicalized. 2534unsigned ASTContext::getIntegerRank(Type *T) { 2535 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 2536 if (EnumType* ET = dyn_cast<EnumType>(T)) 2537 T = ET->getDecl()->getIntegerType().getTypePtr(); 2538 2539 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2540 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2541 2542 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2543 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2544 2545 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2546 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2547 2548 // There are two things which impact the integer rank: the width, and 2549 // the ordering of builtins. The builtin ordering is encoded in the 2550 // bottom three bits; the width is encoded in the bits above that. 2551 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2552 return FWIT->getWidth() << 3; 2553 2554 switch (cast<BuiltinType>(T)->getKind()) { 2555 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2556 case BuiltinType::Bool: 2557 return 1 + (getIntWidth(BoolTy) << 3); 2558 case BuiltinType::Char_S: 2559 case BuiltinType::Char_U: 2560 case BuiltinType::SChar: 2561 case BuiltinType::UChar: 2562 return 2 + (getIntWidth(CharTy) << 3); 2563 case BuiltinType::Short: 2564 case BuiltinType::UShort: 2565 return 3 + (getIntWidth(ShortTy) << 3); 2566 case BuiltinType::Int: 2567 case BuiltinType::UInt: 2568 return 4 + (getIntWidth(IntTy) << 3); 2569 case BuiltinType::Long: 2570 case BuiltinType::ULong: 2571 return 5 + (getIntWidth(LongTy) << 3); 2572 case BuiltinType::LongLong: 2573 case BuiltinType::ULongLong: 2574 return 6 + (getIntWidth(LongLongTy) << 3); 2575 case BuiltinType::Int128: 2576 case BuiltinType::UInt128: 2577 return 7 + (getIntWidth(Int128Ty) << 3); 2578 } 2579} 2580 2581/// \brief Whether this is a promotable bitfield reference according 2582/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2583/// 2584/// \returns the type this bit-field will promote to, or NULL if no 2585/// promotion occurs. 2586QualType ASTContext::isPromotableBitField(Expr *E) { 2587 FieldDecl *Field = E->getBitField(); 2588 if (!Field) 2589 return QualType(); 2590 2591 QualType FT = Field->getType(); 2592 2593 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2594 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2595 uint64_t IntSize = getTypeSize(IntTy); 2596 // GCC extension compatibility: if the bit-field size is less than or equal 2597 // to the size of int, it gets promoted no matter what its type is. 2598 // For instance, unsigned long bf : 4 gets promoted to signed int. 2599 if (BitWidth < IntSize) 2600 return IntTy; 2601 2602 if (BitWidth == IntSize) 2603 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2604 2605 // Types bigger than int are not subject to promotions, and therefore act 2606 // like the base type. 2607 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2608 // is ridiculous. 2609 return QualType(); 2610} 2611 2612/// getPromotedIntegerType - Returns the type that Promotable will 2613/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2614/// integer type. 2615QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2616 assert(!Promotable.isNull()); 2617 assert(Promotable->isPromotableIntegerType()); 2618 if (Promotable->isSignedIntegerType()) 2619 return IntTy; 2620 uint64_t PromotableSize = getTypeSize(Promotable); 2621 uint64_t IntSize = getTypeSize(IntTy); 2622 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2623 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2624} 2625 2626/// getIntegerTypeOrder - Returns the highest ranked integer type: 2627/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2628/// LHS < RHS, return -1. 2629int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2630 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2631 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2632 if (LHSC == RHSC) return 0; 2633 2634 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2635 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2636 2637 unsigned LHSRank = getIntegerRank(LHSC); 2638 unsigned RHSRank = getIntegerRank(RHSC); 2639 2640 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2641 if (LHSRank == RHSRank) return 0; 2642 return LHSRank > RHSRank ? 1 : -1; 2643 } 2644 2645 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2646 if (LHSUnsigned) { 2647 // If the unsigned [LHS] type is larger, return it. 2648 if (LHSRank >= RHSRank) 2649 return 1; 2650 2651 // If the signed type can represent all values of the unsigned type, it 2652 // wins. Because we are dealing with 2's complement and types that are 2653 // powers of two larger than each other, this is always safe. 2654 return -1; 2655 } 2656 2657 // If the unsigned [RHS] type is larger, return it. 2658 if (RHSRank >= LHSRank) 2659 return -1; 2660 2661 // If the signed type can represent all values of the unsigned type, it 2662 // wins. Because we are dealing with 2's complement and types that are 2663 // powers of two larger than each other, this is always safe. 2664 return 1; 2665} 2666 2667// getCFConstantStringType - Return the type used for constant CFStrings. 2668QualType ASTContext::getCFConstantStringType() { 2669 if (!CFConstantStringTypeDecl) { 2670 CFConstantStringTypeDecl = 2671 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2672 &Idents.get("NSConstantString")); 2673 QualType FieldTypes[4]; 2674 2675 // const int *isa; 2676 FieldTypes[0] = getPointerType(IntTy.withConst()); 2677 // int flags; 2678 FieldTypes[1] = IntTy; 2679 // const char *str; 2680 FieldTypes[2] = getPointerType(CharTy.withConst()); 2681 // long length; 2682 FieldTypes[3] = LongTy; 2683 2684 // Create fields 2685 for (unsigned i = 0; i < 4; ++i) { 2686 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2687 SourceLocation(), 0, 2688 FieldTypes[i], /*DInfo=*/0, 2689 /*BitWidth=*/0, 2690 /*Mutable=*/false); 2691 CFConstantStringTypeDecl->addDecl(Field); 2692 } 2693 2694 CFConstantStringTypeDecl->completeDefinition(*this); 2695 } 2696 2697 return getTagDeclType(CFConstantStringTypeDecl); 2698} 2699 2700void ASTContext::setCFConstantStringType(QualType T) { 2701 const RecordType *Rec = T->getAs<RecordType>(); 2702 assert(Rec && "Invalid CFConstantStringType"); 2703 CFConstantStringTypeDecl = Rec->getDecl(); 2704} 2705 2706QualType ASTContext::getObjCFastEnumerationStateType() { 2707 if (!ObjCFastEnumerationStateTypeDecl) { 2708 ObjCFastEnumerationStateTypeDecl = 2709 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2710 &Idents.get("__objcFastEnumerationState")); 2711 2712 QualType FieldTypes[] = { 2713 UnsignedLongTy, 2714 getPointerType(ObjCIdTypedefType), 2715 getPointerType(UnsignedLongTy), 2716 getConstantArrayType(UnsignedLongTy, 2717 llvm::APInt(32, 5), ArrayType::Normal, 0) 2718 }; 2719 2720 for (size_t i = 0; i < 4; ++i) { 2721 FieldDecl *Field = FieldDecl::Create(*this, 2722 ObjCFastEnumerationStateTypeDecl, 2723 SourceLocation(), 0, 2724 FieldTypes[i], /*DInfo=*/0, 2725 /*BitWidth=*/0, 2726 /*Mutable=*/false); 2727 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2728 } 2729 2730 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2731 } 2732 2733 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2734} 2735 2736QualType ASTContext::getBlockDescriptorType() { 2737 if (BlockDescriptorType) 2738 return getTagDeclType(BlockDescriptorType); 2739 2740 RecordDecl *T; 2741 // FIXME: Needs the FlagAppleBlock bit. 2742 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2743 &Idents.get("__block_descriptor")); 2744 2745 QualType FieldTypes[] = { 2746 UnsignedLongTy, 2747 UnsignedLongTy, 2748 }; 2749 2750 const char *FieldNames[] = { 2751 "reserved", 2752 "Size" 2753 }; 2754 2755 for (size_t i = 0; i < 2; ++i) { 2756 FieldDecl *Field = FieldDecl::Create(*this, 2757 T, 2758 SourceLocation(), 2759 &Idents.get(FieldNames[i]), 2760 FieldTypes[i], /*DInfo=*/0, 2761 /*BitWidth=*/0, 2762 /*Mutable=*/false); 2763 T->addDecl(Field); 2764 } 2765 2766 T->completeDefinition(*this); 2767 2768 BlockDescriptorType = T; 2769 2770 return getTagDeclType(BlockDescriptorType); 2771} 2772 2773void ASTContext::setBlockDescriptorType(QualType T) { 2774 const RecordType *Rec = T->getAs<RecordType>(); 2775 assert(Rec && "Invalid BlockDescriptorType"); 2776 BlockDescriptorType = Rec->getDecl(); 2777} 2778 2779QualType ASTContext::getBlockDescriptorExtendedType() { 2780 if (BlockDescriptorExtendedType) 2781 return getTagDeclType(BlockDescriptorExtendedType); 2782 2783 RecordDecl *T; 2784 // FIXME: Needs the FlagAppleBlock bit. 2785 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2786 &Idents.get("__block_descriptor_withcopydispose")); 2787 2788 QualType FieldTypes[] = { 2789 UnsignedLongTy, 2790 UnsignedLongTy, 2791 getPointerType(VoidPtrTy), 2792 getPointerType(VoidPtrTy) 2793 }; 2794 2795 const char *FieldNames[] = { 2796 "reserved", 2797 "Size", 2798 "CopyFuncPtr", 2799 "DestroyFuncPtr" 2800 }; 2801 2802 for (size_t i = 0; i < 4; ++i) { 2803 FieldDecl *Field = FieldDecl::Create(*this, 2804 T, 2805 SourceLocation(), 2806 &Idents.get(FieldNames[i]), 2807 FieldTypes[i], /*DInfo=*/0, 2808 /*BitWidth=*/0, 2809 /*Mutable=*/false); 2810 T->addDecl(Field); 2811 } 2812 2813 T->completeDefinition(*this); 2814 2815 BlockDescriptorExtendedType = T; 2816 2817 return getTagDeclType(BlockDescriptorExtendedType); 2818} 2819 2820void ASTContext::setBlockDescriptorExtendedType(QualType T) { 2821 const RecordType *Rec = T->getAs<RecordType>(); 2822 assert(Rec && "Invalid BlockDescriptorType"); 2823 BlockDescriptorExtendedType = Rec->getDecl(); 2824} 2825 2826bool ASTContext::BlockRequiresCopying(QualType Ty) { 2827 if (Ty->isBlockPointerType()) 2828 return true; 2829 if (isObjCNSObjectType(Ty)) 2830 return true; 2831 if (Ty->isObjCObjectPointerType()) 2832 return true; 2833 return false; 2834} 2835 2836QualType ASTContext::BuildByRefType(const char *DeclName, QualType Ty) { 2837 // type = struct __Block_byref_1_X { 2838 // void *__isa; 2839 // struct __Block_byref_1_X *__forwarding; 2840 // unsigned int __flags; 2841 // unsigned int __size; 2842 // void *__copy_helper; // as needed 2843 // void *__destroy_help // as needed 2844 // int X; 2845 // } * 2846 2847 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 2848 2849 // FIXME: Move up 2850 static int UniqueBlockByRefTypeID = 0; 2851 char Name[36]; 2852 sprintf(Name, "__Block_byref_%d_%s", ++UniqueBlockByRefTypeID, DeclName); 2853 RecordDecl *T; 2854 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2855 &Idents.get(Name)); 2856 T->startDefinition(); 2857 QualType Int32Ty = IntTy; 2858 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 2859 QualType FieldTypes[] = { 2860 getPointerType(VoidPtrTy), 2861 getPointerType(getTagDeclType(T)), 2862 Int32Ty, 2863 Int32Ty, 2864 getPointerType(VoidPtrTy), 2865 getPointerType(VoidPtrTy), 2866 Ty 2867 }; 2868 2869 const char *FieldNames[] = { 2870 "__isa", 2871 "__forwarding", 2872 "__flags", 2873 "__size", 2874 "__copy_helper", 2875 "__destroy_helper", 2876 DeclName, 2877 }; 2878 2879 for (size_t i = 0; i < 7; ++i) { 2880 if (!HasCopyAndDispose && i >=4 && i <= 5) 2881 continue; 2882 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2883 &Idents.get(FieldNames[i]), 2884 FieldTypes[i], /*DInfo=*/0, 2885 /*BitWidth=*/0, /*Mutable=*/false); 2886 T->addDecl(Field); 2887 } 2888 2889 T->completeDefinition(*this); 2890 2891 return getPointerType(getTagDeclType(T)); 2892} 2893 2894 2895QualType ASTContext::getBlockParmType( 2896 bool BlockHasCopyDispose, 2897 llvm::SmallVector<const Expr *, 8> &BlockDeclRefDecls) { 2898 // FIXME: Move up 2899 static int UniqueBlockParmTypeID = 0; 2900 char Name[36]; 2901 sprintf(Name, "__block_literal_%u", ++UniqueBlockParmTypeID); 2902 RecordDecl *T; 2903 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2904 &Idents.get(Name)); 2905 QualType FieldTypes[] = { 2906 getPointerType(VoidPtrTy), 2907 IntTy, 2908 IntTy, 2909 getPointerType(VoidPtrTy), 2910 (BlockHasCopyDispose ? 2911 getPointerType(getBlockDescriptorExtendedType()) : 2912 getPointerType(getBlockDescriptorType())) 2913 }; 2914 2915 const char *FieldNames[] = { 2916 "__isa", 2917 "__flags", 2918 "__reserved", 2919 "__FuncPtr", 2920 "__descriptor" 2921 }; 2922 2923 for (size_t i = 0; i < 5; ++i) { 2924 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2925 &Idents.get(FieldNames[i]), 2926 FieldTypes[i], /*DInfo=*/0, 2927 /*BitWidth=*/0, /*Mutable=*/false); 2928 T->addDecl(Field); 2929 } 2930 2931 for (size_t i = 0; i < BlockDeclRefDecls.size(); ++i) { 2932 const Expr *E = BlockDeclRefDecls[i]; 2933 const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); 2934 clang::IdentifierInfo *Name = 0; 2935 if (BDRE) { 2936 const ValueDecl *D = BDRE->getDecl(); 2937 Name = &Idents.get(D->getName()); 2938 } 2939 QualType FieldType = E->getType(); 2940 2941 if (BDRE && BDRE->isByRef()) 2942 FieldType = BuildByRefType(BDRE->getDecl()->getNameAsCString(), 2943 FieldType); 2944 2945 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2946 Name, FieldType, /*DInfo=*/0, 2947 /*BitWidth=*/0, /*Mutable=*/false); 2948 T->addDecl(Field); 2949 } 2950 2951 T->completeDefinition(*this); 2952 2953 return getPointerType(getTagDeclType(T)); 2954} 2955 2956void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2957 const RecordType *Rec = T->getAs<RecordType>(); 2958 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2959 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2960} 2961 2962// This returns true if a type has been typedefed to BOOL: 2963// typedef <type> BOOL; 2964static bool isTypeTypedefedAsBOOL(QualType T) { 2965 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2966 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2967 return II->isStr("BOOL"); 2968 2969 return false; 2970} 2971 2972/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2973/// purpose. 2974int ASTContext::getObjCEncodingTypeSize(QualType type) { 2975 uint64_t sz = getTypeSize(type); 2976 2977 // Make all integer and enum types at least as large as an int 2978 if (sz > 0 && type->isIntegralType()) 2979 sz = std::max(sz, getTypeSize(IntTy)); 2980 // Treat arrays as pointers, since that's how they're passed in. 2981 else if (type->isArrayType()) 2982 sz = getTypeSize(VoidPtrTy); 2983 return sz / getTypeSize(CharTy); 2984} 2985 2986/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2987/// declaration. 2988void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2989 std::string& S) { 2990 // FIXME: This is not very efficient. 2991 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2992 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2993 // Encode result type. 2994 getObjCEncodingForType(Decl->getResultType(), S); 2995 // Compute size of all parameters. 2996 // Start with computing size of a pointer in number of bytes. 2997 // FIXME: There might(should) be a better way of doing this computation! 2998 SourceLocation Loc; 2999 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 3000 // The first two arguments (self and _cmd) are pointers; account for 3001 // their size. 3002 int ParmOffset = 2 * PtrSize; 3003 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3004 E = Decl->param_end(); PI != E; ++PI) { 3005 QualType PType = (*PI)->getType(); 3006 int sz = getObjCEncodingTypeSize(PType); 3007 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 3008 ParmOffset += sz; 3009 } 3010 S += llvm::utostr(ParmOffset); 3011 S += "@0:"; 3012 S += llvm::utostr(PtrSize); 3013 3014 // Argument types. 3015 ParmOffset = 2 * PtrSize; 3016 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3017 E = Decl->param_end(); PI != E; ++PI) { 3018 ParmVarDecl *PVDecl = *PI; 3019 QualType PType = PVDecl->getOriginalType(); 3020 if (const ArrayType *AT = 3021 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3022 // Use array's original type only if it has known number of 3023 // elements. 3024 if (!isa<ConstantArrayType>(AT)) 3025 PType = PVDecl->getType(); 3026 } else if (PType->isFunctionType()) 3027 PType = PVDecl->getType(); 3028 // Process argument qualifiers for user supplied arguments; such as, 3029 // 'in', 'inout', etc. 3030 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3031 getObjCEncodingForType(PType, S); 3032 S += llvm::utostr(ParmOffset); 3033 ParmOffset += getObjCEncodingTypeSize(PType); 3034 } 3035} 3036 3037/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3038/// property declaration. If non-NULL, Container must be either an 3039/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3040/// NULL when getting encodings for protocol properties. 3041/// Property attributes are stored as a comma-delimited C string. The simple 3042/// attributes readonly and bycopy are encoded as single characters. The 3043/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3044/// encoded as single characters, followed by an identifier. Property types 3045/// are also encoded as a parametrized attribute. The characters used to encode 3046/// these attributes are defined by the following enumeration: 3047/// @code 3048/// enum PropertyAttributes { 3049/// kPropertyReadOnly = 'R', // property is read-only. 3050/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3051/// kPropertyByref = '&', // property is a reference to the value last assigned 3052/// kPropertyDynamic = 'D', // property is dynamic 3053/// kPropertyGetter = 'G', // followed by getter selector name 3054/// kPropertySetter = 'S', // followed by setter selector name 3055/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3056/// kPropertyType = 't' // followed by old-style type encoding. 3057/// kPropertyWeak = 'W' // 'weak' property 3058/// kPropertyStrong = 'P' // property GC'able 3059/// kPropertyNonAtomic = 'N' // property non-atomic 3060/// }; 3061/// @endcode 3062void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3063 const Decl *Container, 3064 std::string& S) { 3065 // Collect information from the property implementation decl(s). 3066 bool Dynamic = false; 3067 ObjCPropertyImplDecl *SynthesizePID = 0; 3068 3069 // FIXME: Duplicated code due to poor abstraction. 3070 if (Container) { 3071 if (const ObjCCategoryImplDecl *CID = 3072 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3073 for (ObjCCategoryImplDecl::propimpl_iterator 3074 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3075 i != e; ++i) { 3076 ObjCPropertyImplDecl *PID = *i; 3077 if (PID->getPropertyDecl() == PD) { 3078 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3079 Dynamic = true; 3080 } else { 3081 SynthesizePID = PID; 3082 } 3083 } 3084 } 3085 } else { 3086 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3087 for (ObjCCategoryImplDecl::propimpl_iterator 3088 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3089 i != e; ++i) { 3090 ObjCPropertyImplDecl *PID = *i; 3091 if (PID->getPropertyDecl() == PD) { 3092 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3093 Dynamic = true; 3094 } else { 3095 SynthesizePID = PID; 3096 } 3097 } 3098 } 3099 } 3100 } 3101 3102 // FIXME: This is not very efficient. 3103 S = "T"; 3104 3105 // Encode result type. 3106 // GCC has some special rules regarding encoding of properties which 3107 // closely resembles encoding of ivars. 3108 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3109 true /* outermost type */, 3110 true /* encoding for property */); 3111 3112 if (PD->isReadOnly()) { 3113 S += ",R"; 3114 } else { 3115 switch (PD->getSetterKind()) { 3116 case ObjCPropertyDecl::Assign: break; 3117 case ObjCPropertyDecl::Copy: S += ",C"; break; 3118 case ObjCPropertyDecl::Retain: S += ",&"; break; 3119 } 3120 } 3121 3122 // It really isn't clear at all what this means, since properties 3123 // are "dynamic by default". 3124 if (Dynamic) 3125 S += ",D"; 3126 3127 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3128 S += ",N"; 3129 3130 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3131 S += ",G"; 3132 S += PD->getGetterName().getAsString(); 3133 } 3134 3135 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3136 S += ",S"; 3137 S += PD->getSetterName().getAsString(); 3138 } 3139 3140 if (SynthesizePID) { 3141 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3142 S += ",V"; 3143 S += OID->getNameAsString(); 3144 } 3145 3146 // FIXME: OBJCGC: weak & strong 3147} 3148 3149/// getLegacyIntegralTypeEncoding - 3150/// Another legacy compatibility encoding: 32-bit longs are encoded as 3151/// 'l' or 'L' , but not always. For typedefs, we need to use 3152/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3153/// 3154void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3155 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3156 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3157 if (BT->getKind() == BuiltinType::ULong && 3158 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3159 PointeeTy = UnsignedIntTy; 3160 else 3161 if (BT->getKind() == BuiltinType::Long && 3162 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3163 PointeeTy = IntTy; 3164 } 3165 } 3166} 3167 3168void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3169 const FieldDecl *Field) { 3170 // We follow the behavior of gcc, expanding structures which are 3171 // directly pointed to, and expanding embedded structures. Note that 3172 // these rules are sufficient to prevent recursive encoding of the 3173 // same type. 3174 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3175 true /* outermost type */); 3176} 3177 3178static void EncodeBitField(const ASTContext *Context, std::string& S, 3179 const FieldDecl *FD) { 3180 const Expr *E = FD->getBitWidth(); 3181 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3182 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3183 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3184 S += 'b'; 3185 S += llvm::utostr(N); 3186} 3187 3188// FIXME: Use SmallString for accumulating string. 3189void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3190 bool ExpandPointedToStructures, 3191 bool ExpandStructures, 3192 const FieldDecl *FD, 3193 bool OutermostType, 3194 bool EncodingProperty) { 3195 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3196 if (FD && FD->isBitField()) 3197 return EncodeBitField(this, S, FD); 3198 char encoding; 3199 switch (BT->getKind()) { 3200 default: assert(0 && "Unhandled builtin type kind"); 3201 case BuiltinType::Void: encoding = 'v'; break; 3202 case BuiltinType::Bool: encoding = 'B'; break; 3203 case BuiltinType::Char_U: 3204 case BuiltinType::UChar: encoding = 'C'; break; 3205 case BuiltinType::UShort: encoding = 'S'; break; 3206 case BuiltinType::UInt: encoding = 'I'; break; 3207 case BuiltinType::ULong: 3208 encoding = 3209 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3210 break; 3211 case BuiltinType::UInt128: encoding = 'T'; break; 3212 case BuiltinType::ULongLong: encoding = 'Q'; break; 3213 case BuiltinType::Char_S: 3214 case BuiltinType::SChar: encoding = 'c'; break; 3215 case BuiltinType::Short: encoding = 's'; break; 3216 case BuiltinType::Int: encoding = 'i'; break; 3217 case BuiltinType::Long: 3218 encoding = 3219 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3220 break; 3221 case BuiltinType::LongLong: encoding = 'q'; break; 3222 case BuiltinType::Int128: encoding = 't'; break; 3223 case BuiltinType::Float: encoding = 'f'; break; 3224 case BuiltinType::Double: encoding = 'd'; break; 3225 case BuiltinType::LongDouble: encoding = 'd'; break; 3226 } 3227 3228 S += encoding; 3229 return; 3230 } 3231 3232 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3233 S += 'j'; 3234 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3235 false); 3236 return; 3237 } 3238 3239 if (const PointerType *PT = T->getAs<PointerType>()) { 3240 QualType PointeeTy = PT->getPointeeType(); 3241 bool isReadOnly = false; 3242 // For historical/compatibility reasons, the read-only qualifier of the 3243 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3244 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3245 // Also, do not emit the 'r' for anything but the outermost type! 3246 if (isa<TypedefType>(T.getTypePtr())) { 3247 if (OutermostType && T.isConstQualified()) { 3248 isReadOnly = true; 3249 S += 'r'; 3250 } 3251 } else if (OutermostType) { 3252 QualType P = PointeeTy; 3253 while (P->getAs<PointerType>()) 3254 P = P->getAs<PointerType>()->getPointeeType(); 3255 if (P.isConstQualified()) { 3256 isReadOnly = true; 3257 S += 'r'; 3258 } 3259 } 3260 if (isReadOnly) { 3261 // Another legacy compatibility encoding. Some ObjC qualifier and type 3262 // combinations need to be rearranged. 3263 // Rewrite "in const" from "nr" to "rn" 3264 const char * s = S.c_str(); 3265 int len = S.length(); 3266 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3267 std::string replace = "rn"; 3268 S.replace(S.end()-2, S.end(), replace); 3269 } 3270 } 3271 if (isObjCSelType(PointeeTy)) { 3272 S += ':'; 3273 return; 3274 } 3275 3276 if (PointeeTy->isCharType()) { 3277 // char pointer types should be encoded as '*' unless it is a 3278 // type that has been typedef'd to 'BOOL'. 3279 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3280 S += '*'; 3281 return; 3282 } 3283 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3284 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3285 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3286 S += '#'; 3287 return; 3288 } 3289 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3290 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3291 S += '@'; 3292 return; 3293 } 3294 // fall through... 3295 } 3296 S += '^'; 3297 getLegacyIntegralTypeEncoding(PointeeTy); 3298 3299 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3300 NULL); 3301 return; 3302 } 3303 3304 if (const ArrayType *AT = 3305 // Ignore type qualifiers etc. 3306 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3307 if (isa<IncompleteArrayType>(AT)) { 3308 // Incomplete arrays are encoded as a pointer to the array element. 3309 S += '^'; 3310 3311 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3312 false, ExpandStructures, FD); 3313 } else { 3314 S += '['; 3315 3316 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3317 S += llvm::utostr(CAT->getSize().getZExtValue()); 3318 else { 3319 //Variable length arrays are encoded as a regular array with 0 elements. 3320 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3321 S += '0'; 3322 } 3323 3324 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3325 false, ExpandStructures, FD); 3326 S += ']'; 3327 } 3328 return; 3329 } 3330 3331 if (T->getAs<FunctionType>()) { 3332 S += '?'; 3333 return; 3334 } 3335 3336 if (const RecordType *RTy = T->getAs<RecordType>()) { 3337 RecordDecl *RDecl = RTy->getDecl(); 3338 S += RDecl->isUnion() ? '(' : '{'; 3339 // Anonymous structures print as '?' 3340 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3341 S += II->getName(); 3342 } else { 3343 S += '?'; 3344 } 3345 if (ExpandStructures) { 3346 S += '='; 3347 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3348 FieldEnd = RDecl->field_end(); 3349 Field != FieldEnd; ++Field) { 3350 if (FD) { 3351 S += '"'; 3352 S += Field->getNameAsString(); 3353 S += '"'; 3354 } 3355 3356 // Special case bit-fields. 3357 if (Field->isBitField()) { 3358 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3359 (*Field)); 3360 } else { 3361 QualType qt = Field->getType(); 3362 getLegacyIntegralTypeEncoding(qt); 3363 getObjCEncodingForTypeImpl(qt, S, false, true, 3364 FD); 3365 } 3366 } 3367 } 3368 S += RDecl->isUnion() ? ')' : '}'; 3369 return; 3370 } 3371 3372 if (T->isEnumeralType()) { 3373 if (FD && FD->isBitField()) 3374 EncodeBitField(this, S, FD); 3375 else 3376 S += 'i'; 3377 return; 3378 } 3379 3380 if (T->isBlockPointerType()) { 3381 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3382 return; 3383 } 3384 3385 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3386 // @encode(class_name) 3387 ObjCInterfaceDecl *OI = OIT->getDecl(); 3388 S += '{'; 3389 const IdentifierInfo *II = OI->getIdentifier(); 3390 S += II->getName(); 3391 S += '='; 3392 llvm::SmallVector<FieldDecl*, 32> RecFields; 3393 CollectObjCIvars(OI, RecFields); 3394 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3395 if (RecFields[i]->isBitField()) 3396 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3397 RecFields[i]); 3398 else 3399 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3400 FD); 3401 } 3402 S += '}'; 3403 return; 3404 } 3405 3406 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3407 if (OPT->isObjCIdType()) { 3408 S += '@'; 3409 return; 3410 } 3411 3412 if (OPT->isObjCClassType()) { 3413 S += '#'; 3414 return; 3415 } 3416 3417 if (OPT->isObjCQualifiedIdType()) { 3418 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3419 ExpandPointedToStructures, 3420 ExpandStructures, FD); 3421 if (FD || EncodingProperty) { 3422 // Note that we do extended encoding of protocol qualifer list 3423 // Only when doing ivar or property encoding. 3424 S += '"'; 3425 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3426 E = OPT->qual_end(); I != E; ++I) { 3427 S += '<'; 3428 S += (*I)->getNameAsString(); 3429 S += '>'; 3430 } 3431 S += '"'; 3432 } 3433 return; 3434 } 3435 3436 QualType PointeeTy = OPT->getPointeeType(); 3437 if (!EncodingProperty && 3438 isa<TypedefType>(PointeeTy.getTypePtr())) { 3439 // Another historical/compatibility reason. 3440 // We encode the underlying type which comes out as 3441 // {...}; 3442 S += '^'; 3443 getObjCEncodingForTypeImpl(PointeeTy, S, 3444 false, ExpandPointedToStructures, 3445 NULL); 3446 return; 3447 } 3448 3449 S += '@'; 3450 if (FD || EncodingProperty) { 3451 S += '"'; 3452 S += OPT->getInterfaceDecl()->getNameAsCString(); 3453 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3454 E = OPT->qual_end(); I != E; ++I) { 3455 S += '<'; 3456 S += (*I)->getNameAsString(); 3457 S += '>'; 3458 } 3459 S += '"'; 3460 } 3461 return; 3462 } 3463 3464 assert(0 && "@encode for type not implemented!"); 3465} 3466 3467void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3468 std::string& S) const { 3469 if (QT & Decl::OBJC_TQ_In) 3470 S += 'n'; 3471 if (QT & Decl::OBJC_TQ_Inout) 3472 S += 'N'; 3473 if (QT & Decl::OBJC_TQ_Out) 3474 S += 'o'; 3475 if (QT & Decl::OBJC_TQ_Bycopy) 3476 S += 'O'; 3477 if (QT & Decl::OBJC_TQ_Byref) 3478 S += 'R'; 3479 if (QT & Decl::OBJC_TQ_Oneway) 3480 S += 'V'; 3481} 3482 3483void ASTContext::setBuiltinVaListType(QualType T) { 3484 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3485 3486 BuiltinVaListType = T; 3487} 3488 3489void ASTContext::setObjCIdType(QualType T) { 3490 ObjCIdTypedefType = T; 3491} 3492 3493void ASTContext::setObjCSelType(QualType T) { 3494 ObjCSelType = T; 3495 3496 const TypedefType *TT = T->getAs<TypedefType>(); 3497 if (!TT) 3498 return; 3499 TypedefDecl *TD = TT->getDecl(); 3500 3501 // typedef struct objc_selector *SEL; 3502 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3503 if (!ptr) 3504 return; 3505 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3506 if (!rec) 3507 return; 3508 SelStructType = rec; 3509} 3510 3511void ASTContext::setObjCProtoType(QualType QT) { 3512 ObjCProtoType = QT; 3513} 3514 3515void ASTContext::setObjCClassType(QualType T) { 3516 ObjCClassTypedefType = T; 3517} 3518 3519void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3520 assert(ObjCConstantStringType.isNull() && 3521 "'NSConstantString' type already set!"); 3522 3523 ObjCConstantStringType = getObjCInterfaceType(Decl); 3524} 3525 3526/// \brief Retrieve the template name that represents a qualified 3527/// template name such as \c std::vector. 3528TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3529 bool TemplateKeyword, 3530 TemplateDecl *Template) { 3531 llvm::FoldingSetNodeID ID; 3532 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3533 3534 void *InsertPos = 0; 3535 QualifiedTemplateName *QTN = 3536 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3537 if (!QTN) { 3538 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3539 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3540 } 3541 3542 return TemplateName(QTN); 3543} 3544 3545/// \brief Retrieve the template name that represents a qualified 3546/// template name such as \c std::vector. 3547TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3548 bool TemplateKeyword, 3549 OverloadedFunctionDecl *Template) { 3550 llvm::FoldingSetNodeID ID; 3551 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3552 3553 void *InsertPos = 0; 3554 QualifiedTemplateName *QTN = 3555 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3556 if (!QTN) { 3557 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3558 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3559 } 3560 3561 return TemplateName(QTN); 3562} 3563 3564/// \brief Retrieve the template name that represents a dependent 3565/// template name such as \c MetaFun::template apply. 3566TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3567 const IdentifierInfo *Name) { 3568 assert((!NNS || NNS->isDependent()) && 3569 "Nested name specifier must be dependent"); 3570 3571 llvm::FoldingSetNodeID ID; 3572 DependentTemplateName::Profile(ID, NNS, Name); 3573 3574 void *InsertPos = 0; 3575 DependentTemplateName *QTN = 3576 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3577 3578 if (QTN) 3579 return TemplateName(QTN); 3580 3581 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3582 if (CanonNNS == NNS) { 3583 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3584 } else { 3585 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3586 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3587 } 3588 3589 DependentTemplateNames.InsertNode(QTN, InsertPos); 3590 return TemplateName(QTN); 3591} 3592 3593/// getFromTargetType - Given one of the integer types provided by 3594/// TargetInfo, produce the corresponding type. The unsigned @p Type 3595/// is actually a value of type @c TargetInfo::IntType. 3596QualType ASTContext::getFromTargetType(unsigned Type) const { 3597 switch (Type) { 3598 case TargetInfo::NoInt: return QualType(); 3599 case TargetInfo::SignedShort: return ShortTy; 3600 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3601 case TargetInfo::SignedInt: return IntTy; 3602 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3603 case TargetInfo::SignedLong: return LongTy; 3604 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3605 case TargetInfo::SignedLongLong: return LongLongTy; 3606 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3607 } 3608 3609 assert(false && "Unhandled TargetInfo::IntType value"); 3610 return QualType(); 3611} 3612 3613//===----------------------------------------------------------------------===// 3614// Type Predicates. 3615//===----------------------------------------------------------------------===// 3616 3617/// isObjCNSObjectType - Return true if this is an NSObject object using 3618/// NSObject attribute on a c-style pointer type. 3619/// FIXME - Make it work directly on types. 3620/// FIXME: Move to Type. 3621/// 3622bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3623 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3624 if (TypedefDecl *TD = TDT->getDecl()) 3625 if (TD->getAttr<ObjCNSObjectAttr>()) 3626 return true; 3627 } 3628 return false; 3629} 3630 3631/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3632/// garbage collection attribute. 3633/// 3634Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3635 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3636 if (getLangOptions().ObjC1 && 3637 getLangOptions().getGCMode() != LangOptions::NonGC) { 3638 GCAttrs = Ty.getObjCGCAttr(); 3639 // Default behavious under objective-c's gc is for objective-c pointers 3640 // (or pointers to them) be treated as though they were declared 3641 // as __strong. 3642 if (GCAttrs == Qualifiers::GCNone) { 3643 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3644 GCAttrs = Qualifiers::Strong; 3645 else if (Ty->isPointerType()) 3646 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3647 } 3648 // Non-pointers have none gc'able attribute regardless of the attribute 3649 // set on them. 3650 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3651 return Qualifiers::GCNone; 3652 } 3653 return GCAttrs; 3654} 3655 3656//===----------------------------------------------------------------------===// 3657// Type Compatibility Testing 3658//===----------------------------------------------------------------------===// 3659 3660/// areCompatVectorTypes - Return true if the two specified vector types are 3661/// compatible. 3662static bool areCompatVectorTypes(const VectorType *LHS, 3663 const VectorType *RHS) { 3664 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 3665 return LHS->getElementType() == RHS->getElementType() && 3666 LHS->getNumElements() == RHS->getNumElements(); 3667} 3668 3669//===----------------------------------------------------------------------===// 3670// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3671//===----------------------------------------------------------------------===// 3672 3673/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3674/// inheritance hierarchy of 'rProto'. 3675bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3676 ObjCProtocolDecl *rProto) { 3677 if (lProto == rProto) 3678 return true; 3679 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3680 E = rProto->protocol_end(); PI != E; ++PI) 3681 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3682 return true; 3683 return false; 3684} 3685 3686/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3687/// return true if lhs's protocols conform to rhs's protocol; false 3688/// otherwise. 3689bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3690 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3691 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3692 return false; 3693} 3694 3695/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3696/// ObjCQualifiedIDType. 3697bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3698 bool compare) { 3699 // Allow id<P..> and an 'id' or void* type in all cases. 3700 if (lhs->isVoidPointerType() || 3701 lhs->isObjCIdType() || lhs->isObjCClassType()) 3702 return true; 3703 else if (rhs->isVoidPointerType() || 3704 rhs->isObjCIdType() || rhs->isObjCClassType()) 3705 return true; 3706 3707 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3708 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3709 3710 if (!rhsOPT) return false; 3711 3712 if (rhsOPT->qual_empty()) { 3713 // If the RHS is a unqualified interface pointer "NSString*", 3714 // make sure we check the class hierarchy. 3715 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3716 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3717 E = lhsQID->qual_end(); I != E; ++I) { 3718 // when comparing an id<P> on lhs with a static type on rhs, 3719 // see if static class implements all of id's protocols, directly or 3720 // through its super class and categories. 3721 if (!rhsID->ClassImplementsProtocol(*I, true)) 3722 return false; 3723 } 3724 } 3725 // If there are no qualifiers and no interface, we have an 'id'. 3726 return true; 3727 } 3728 // Both the right and left sides have qualifiers. 3729 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3730 E = lhsQID->qual_end(); I != E; ++I) { 3731 ObjCProtocolDecl *lhsProto = *I; 3732 bool match = false; 3733 3734 // when comparing an id<P> on lhs with a static type on rhs, 3735 // see if static class implements all of id's protocols, directly or 3736 // through its super class and categories. 3737 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3738 E = rhsOPT->qual_end(); J != E; ++J) { 3739 ObjCProtocolDecl *rhsProto = *J; 3740 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3741 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3742 match = true; 3743 break; 3744 } 3745 } 3746 // If the RHS is a qualified interface pointer "NSString<P>*", 3747 // make sure we check the class hierarchy. 3748 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3749 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3750 E = lhsQID->qual_end(); I != E; ++I) { 3751 // when comparing an id<P> on lhs with a static type on rhs, 3752 // see if static class implements all of id's protocols, directly or 3753 // through its super class and categories. 3754 if (rhsID->ClassImplementsProtocol(*I, true)) { 3755 match = true; 3756 break; 3757 } 3758 } 3759 } 3760 if (!match) 3761 return false; 3762 } 3763 3764 return true; 3765 } 3766 3767 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3768 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3769 3770 if (const ObjCObjectPointerType *lhsOPT = 3771 lhs->getAsObjCInterfacePointerType()) { 3772 if (lhsOPT->qual_empty()) { 3773 bool match = false; 3774 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3775 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3776 E = rhsQID->qual_end(); I != E; ++I) { 3777 // when comparing an id<P> on lhs with a static type on rhs, 3778 // see if static class implements all of id's protocols, directly or 3779 // through its super class and categories. 3780 if (lhsID->ClassImplementsProtocol(*I, true)) { 3781 match = true; 3782 break; 3783 } 3784 } 3785 if (!match) 3786 return false; 3787 } 3788 return true; 3789 } 3790 // Both the right and left sides have qualifiers. 3791 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3792 E = lhsOPT->qual_end(); I != E; ++I) { 3793 ObjCProtocolDecl *lhsProto = *I; 3794 bool match = false; 3795 3796 // when comparing an id<P> on lhs with a static type on rhs, 3797 // see if static class implements all of id's protocols, directly or 3798 // through its super class and categories. 3799 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3800 E = rhsQID->qual_end(); J != E; ++J) { 3801 ObjCProtocolDecl *rhsProto = *J; 3802 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3803 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3804 match = true; 3805 break; 3806 } 3807 } 3808 if (!match) 3809 return false; 3810 } 3811 return true; 3812 } 3813 return false; 3814} 3815 3816/// canAssignObjCInterfaces - Return true if the two interface types are 3817/// compatible for assignment from RHS to LHS. This handles validation of any 3818/// protocol qualifiers on the LHS or RHS. 3819/// 3820bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3821 const ObjCObjectPointerType *RHSOPT) { 3822 // If either type represents the built-in 'id' or 'Class' types, return true. 3823 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3824 return true; 3825 3826 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3827 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3828 QualType(RHSOPT,0), 3829 false); 3830 3831 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3832 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3833 if (LHS && RHS) // We have 2 user-defined types. 3834 return canAssignObjCInterfaces(LHS, RHS); 3835 3836 return false; 3837} 3838 3839bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3840 const ObjCInterfaceType *RHS) { 3841 // Verify that the base decls are compatible: the RHS must be a subclass of 3842 // the LHS. 3843 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3844 return false; 3845 3846 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3847 // protocol qualified at all, then we are good. 3848 if (LHS->getNumProtocols() == 0) 3849 return true; 3850 3851 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3852 // isn't a superset. 3853 if (RHS->getNumProtocols() == 0) 3854 return true; // FIXME: should return false! 3855 3856 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3857 LHSPE = LHS->qual_end(); 3858 LHSPI != LHSPE; LHSPI++) { 3859 bool RHSImplementsProtocol = false; 3860 3861 // If the RHS doesn't implement the protocol on the left, the types 3862 // are incompatible. 3863 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3864 RHSPE = RHS->qual_end(); 3865 RHSPI != RHSPE; RHSPI++) { 3866 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3867 RHSImplementsProtocol = true; 3868 break; 3869 } 3870 } 3871 // FIXME: For better diagnostics, consider passing back the protocol name. 3872 if (!RHSImplementsProtocol) 3873 return false; 3874 } 3875 // The RHS implements all protocols listed on the LHS. 3876 return true; 3877} 3878 3879bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3880 // get the "pointed to" types 3881 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 3882 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 3883 3884 if (!LHSOPT || !RHSOPT) 3885 return false; 3886 3887 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3888 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3889} 3890 3891/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3892/// both shall have the identically qualified version of a compatible type. 3893/// C99 6.2.7p1: Two types have compatible types if their types are the 3894/// same. See 6.7.[2,3,5] for additional rules. 3895bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3896 return !mergeTypes(LHS, RHS).isNull(); 3897} 3898 3899QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3900 const FunctionType *lbase = lhs->getAs<FunctionType>(); 3901 const FunctionType *rbase = rhs->getAs<FunctionType>(); 3902 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3903 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3904 bool allLTypes = true; 3905 bool allRTypes = true; 3906 3907 // Check return type 3908 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3909 if (retType.isNull()) return QualType(); 3910 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3911 allLTypes = false; 3912 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3913 allRTypes = false; 3914 // FIXME: double check this 3915 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 3916 if (NoReturn != lbase->getNoReturnAttr()) 3917 allLTypes = false; 3918 if (NoReturn != rbase->getNoReturnAttr()) 3919 allRTypes = false; 3920 3921 if (lproto && rproto) { // two C99 style function prototypes 3922 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3923 "C++ shouldn't be here"); 3924 unsigned lproto_nargs = lproto->getNumArgs(); 3925 unsigned rproto_nargs = rproto->getNumArgs(); 3926 3927 // Compatible functions must have the same number of arguments 3928 if (lproto_nargs != rproto_nargs) 3929 return QualType(); 3930 3931 // Variadic and non-variadic functions aren't compatible 3932 if (lproto->isVariadic() != rproto->isVariadic()) 3933 return QualType(); 3934 3935 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3936 return QualType(); 3937 3938 // Check argument compatibility 3939 llvm::SmallVector<QualType, 10> types; 3940 for (unsigned i = 0; i < lproto_nargs; i++) { 3941 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3942 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3943 QualType argtype = mergeTypes(largtype, rargtype); 3944 if (argtype.isNull()) return QualType(); 3945 types.push_back(argtype); 3946 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3947 allLTypes = false; 3948 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3949 allRTypes = false; 3950 } 3951 if (allLTypes) return lhs; 3952 if (allRTypes) return rhs; 3953 return getFunctionType(retType, types.begin(), types.size(), 3954 lproto->isVariadic(), lproto->getTypeQuals(), 3955 NoReturn); 3956 } 3957 3958 if (lproto) allRTypes = false; 3959 if (rproto) allLTypes = false; 3960 3961 const FunctionProtoType *proto = lproto ? lproto : rproto; 3962 if (proto) { 3963 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3964 if (proto->isVariadic()) return QualType(); 3965 // Check that the types are compatible with the types that 3966 // would result from default argument promotions (C99 6.7.5.3p15). 3967 // The only types actually affected are promotable integer 3968 // types and floats, which would be passed as a different 3969 // type depending on whether the prototype is visible. 3970 unsigned proto_nargs = proto->getNumArgs(); 3971 for (unsigned i = 0; i < proto_nargs; ++i) { 3972 QualType argTy = proto->getArgType(i); 3973 if (argTy->isPromotableIntegerType() || 3974 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3975 return QualType(); 3976 } 3977 3978 if (allLTypes) return lhs; 3979 if (allRTypes) return rhs; 3980 return getFunctionType(retType, proto->arg_type_begin(), 3981 proto->getNumArgs(), proto->isVariadic(), 3982 proto->getTypeQuals(), NoReturn); 3983 } 3984 3985 if (allLTypes) return lhs; 3986 if (allRTypes) return rhs; 3987 return getFunctionNoProtoType(retType, NoReturn); 3988} 3989 3990QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3991 // C++ [expr]: If an expression initially has the type "reference to T", the 3992 // type is adjusted to "T" prior to any further analysis, the expression 3993 // designates the object or function denoted by the reference, and the 3994 // expression is an lvalue unless the reference is an rvalue reference and 3995 // the expression is a function call (possibly inside parentheses). 3996 // FIXME: C++ shouldn't be going through here! The rules are different 3997 // enough that they should be handled separately. 3998 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3999 // shouldn't be going through here! 4000 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 4001 LHS = RT->getPointeeType(); 4002 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 4003 RHS = RT->getPointeeType(); 4004 4005 QualType LHSCan = getCanonicalType(LHS), 4006 RHSCan = getCanonicalType(RHS); 4007 4008 // If two types are identical, they are compatible. 4009 if (LHSCan == RHSCan) 4010 return LHS; 4011 4012 // If the qualifiers are different, the types aren't compatible... mostly. 4013 Qualifiers LQuals = LHSCan.getQualifiers(); 4014 Qualifiers RQuals = RHSCan.getQualifiers(); 4015 if (LQuals != RQuals) { 4016 // If any of these qualifiers are different, we have a type 4017 // mismatch. 4018 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 4019 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 4020 return QualType(); 4021 4022 // Exactly one GC qualifier difference is allowed: __strong is 4023 // okay if the other type has no GC qualifier but is an Objective 4024 // C object pointer (i.e. implicitly strong by default). We fix 4025 // this by pretending that the unqualified type was actually 4026 // qualified __strong. 4027 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 4028 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 4029 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 4030 4031 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 4032 return QualType(); 4033 4034 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 4035 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 4036 } 4037 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 4038 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 4039 } 4040 return QualType(); 4041 } 4042 4043 // Okay, qualifiers are equal. 4044 4045 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 4046 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 4047 4048 // We want to consider the two function types to be the same for these 4049 // comparisons, just force one to the other. 4050 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 4051 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 4052 4053 // Same as above for arrays 4054 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 4055 LHSClass = Type::ConstantArray; 4056 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 4057 RHSClass = Type::ConstantArray; 4058 4059 // Canonicalize ExtVector -> Vector. 4060 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 4061 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 4062 4063 // If the canonical type classes don't match. 4064 if (LHSClass != RHSClass) { 4065 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 4066 // a signed integer type, or an unsigned integer type. 4067 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 4068 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 4069 return RHS; 4070 } 4071 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 4072 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 4073 return LHS; 4074 } 4075 4076 return QualType(); 4077 } 4078 4079 // The canonical type classes match. 4080 switch (LHSClass) { 4081#define TYPE(Class, Base) 4082#define ABSTRACT_TYPE(Class, Base) 4083#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4084#define DEPENDENT_TYPE(Class, Base) case Type::Class: 4085#include "clang/AST/TypeNodes.def" 4086 assert(false && "Non-canonical and dependent types shouldn't get here"); 4087 return QualType(); 4088 4089 case Type::LValueReference: 4090 case Type::RValueReference: 4091 case Type::MemberPointer: 4092 assert(false && "C++ should never be in mergeTypes"); 4093 return QualType(); 4094 4095 case Type::IncompleteArray: 4096 case Type::VariableArray: 4097 case Type::FunctionProto: 4098 case Type::ExtVector: 4099 assert(false && "Types are eliminated above"); 4100 return QualType(); 4101 4102 case Type::Pointer: 4103 { 4104 // Merge two pointer types, while trying to preserve typedef info 4105 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 4106 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 4107 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4108 if (ResultType.isNull()) return QualType(); 4109 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4110 return LHS; 4111 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4112 return RHS; 4113 return getPointerType(ResultType); 4114 } 4115 case Type::BlockPointer: 4116 { 4117 // Merge two block pointer types, while trying to preserve typedef info 4118 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 4119 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 4120 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4121 if (ResultType.isNull()) return QualType(); 4122 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4123 return LHS; 4124 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4125 return RHS; 4126 return getBlockPointerType(ResultType); 4127 } 4128 case Type::ConstantArray: 4129 { 4130 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 4131 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 4132 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 4133 return QualType(); 4134 4135 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 4136 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 4137 QualType ResultType = mergeTypes(LHSElem, RHSElem); 4138 if (ResultType.isNull()) return QualType(); 4139 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4140 return LHS; 4141 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4142 return RHS; 4143 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 4144 ArrayType::ArraySizeModifier(), 0); 4145 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 4146 ArrayType::ArraySizeModifier(), 0); 4147 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 4148 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 4149 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4150 return LHS; 4151 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4152 return RHS; 4153 if (LVAT) { 4154 // FIXME: This isn't correct! But tricky to implement because 4155 // the array's size has to be the size of LHS, but the type 4156 // has to be different. 4157 return LHS; 4158 } 4159 if (RVAT) { 4160 // FIXME: This isn't correct! But tricky to implement because 4161 // the array's size has to be the size of RHS, but the type 4162 // has to be different. 4163 return RHS; 4164 } 4165 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4166 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4167 return getIncompleteArrayType(ResultType, 4168 ArrayType::ArraySizeModifier(), 0); 4169 } 4170 case Type::FunctionNoProto: 4171 return mergeFunctionTypes(LHS, RHS); 4172 case Type::Record: 4173 case Type::Enum: 4174 return QualType(); 4175 case Type::Builtin: 4176 // Only exactly equal builtin types are compatible, which is tested above. 4177 return QualType(); 4178 case Type::Complex: 4179 // Distinct complex types are incompatible. 4180 return QualType(); 4181 case Type::Vector: 4182 // FIXME: The merged type should be an ExtVector! 4183 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 4184 return LHS; 4185 return QualType(); 4186 case Type::ObjCInterface: { 4187 // Check if the interfaces are assignment compatible. 4188 // FIXME: This should be type compatibility, e.g. whether 4189 // "LHS x; RHS x;" at global scope is legal. 4190 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 4191 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 4192 if (LHSIface && RHSIface && 4193 canAssignObjCInterfaces(LHSIface, RHSIface)) 4194 return LHS; 4195 4196 return QualType(); 4197 } 4198 case Type::ObjCObjectPointer: { 4199 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4200 RHS->getAs<ObjCObjectPointerType>())) 4201 return LHS; 4202 4203 return QualType(); 4204 } 4205 case Type::FixedWidthInt: 4206 // Distinct fixed-width integers are not compatible. 4207 return QualType(); 4208 case Type::TemplateSpecialization: 4209 assert(false && "Dependent types have no size"); 4210 break; 4211 } 4212 4213 return QualType(); 4214} 4215 4216//===----------------------------------------------------------------------===// 4217// Integer Predicates 4218//===----------------------------------------------------------------------===// 4219 4220unsigned ASTContext::getIntWidth(QualType T) { 4221 if (T == BoolTy) 4222 return 1; 4223 if (FixedWidthIntType *FWIT = dyn_cast<FixedWidthIntType>(T)) { 4224 return FWIT->getWidth(); 4225 } 4226 // For builtin types, just use the standard type sizing method 4227 return (unsigned)getTypeSize(T); 4228} 4229 4230QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4231 assert(T->isSignedIntegerType() && "Unexpected type"); 4232 4233 // Turn <4 x signed int> -> <4 x unsigned int> 4234 if (const VectorType *VTy = T->getAs<VectorType>()) 4235 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4236 VTy->getNumElements()); 4237 4238 // For enums, we return the unsigned version of the base type. 4239 if (const EnumType *ETy = T->getAs<EnumType>()) 4240 T = ETy->getDecl()->getIntegerType(); 4241 4242 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4243 assert(BTy && "Unexpected signed integer type"); 4244 switch (BTy->getKind()) { 4245 case BuiltinType::Char_S: 4246 case BuiltinType::SChar: 4247 return UnsignedCharTy; 4248 case BuiltinType::Short: 4249 return UnsignedShortTy; 4250 case BuiltinType::Int: 4251 return UnsignedIntTy; 4252 case BuiltinType::Long: 4253 return UnsignedLongTy; 4254 case BuiltinType::LongLong: 4255 return UnsignedLongLongTy; 4256 case BuiltinType::Int128: 4257 return UnsignedInt128Ty; 4258 default: 4259 assert(0 && "Unexpected signed integer type"); 4260 return QualType(); 4261 } 4262} 4263 4264ExternalASTSource::~ExternalASTSource() { } 4265 4266void ExternalASTSource::PrintStats() { } 4267 4268 4269//===----------------------------------------------------------------------===// 4270// Builtin Type Computation 4271//===----------------------------------------------------------------------===// 4272 4273/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4274/// pointer over the consumed characters. This returns the resultant type. 4275static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4276 ASTContext::GetBuiltinTypeError &Error, 4277 bool AllowTypeModifiers = true) { 4278 // Modifiers. 4279 int HowLong = 0; 4280 bool Signed = false, Unsigned = false; 4281 4282 // Read the modifiers first. 4283 bool Done = false; 4284 while (!Done) { 4285 switch (*Str++) { 4286 default: Done = true; --Str; break; 4287 case 'S': 4288 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4289 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4290 Signed = true; 4291 break; 4292 case 'U': 4293 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4294 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4295 Unsigned = true; 4296 break; 4297 case 'L': 4298 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4299 ++HowLong; 4300 break; 4301 } 4302 } 4303 4304 QualType Type; 4305 4306 // Read the base type. 4307 switch (*Str++) { 4308 default: assert(0 && "Unknown builtin type letter!"); 4309 case 'v': 4310 assert(HowLong == 0 && !Signed && !Unsigned && 4311 "Bad modifiers used with 'v'!"); 4312 Type = Context.VoidTy; 4313 break; 4314 case 'f': 4315 assert(HowLong == 0 && !Signed && !Unsigned && 4316 "Bad modifiers used with 'f'!"); 4317 Type = Context.FloatTy; 4318 break; 4319 case 'd': 4320 assert(HowLong < 2 && !Signed && !Unsigned && 4321 "Bad modifiers used with 'd'!"); 4322 if (HowLong) 4323 Type = Context.LongDoubleTy; 4324 else 4325 Type = Context.DoubleTy; 4326 break; 4327 case 's': 4328 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4329 if (Unsigned) 4330 Type = Context.UnsignedShortTy; 4331 else 4332 Type = Context.ShortTy; 4333 break; 4334 case 'i': 4335 if (HowLong == 3) 4336 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4337 else if (HowLong == 2) 4338 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4339 else if (HowLong == 1) 4340 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4341 else 4342 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4343 break; 4344 case 'c': 4345 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4346 if (Signed) 4347 Type = Context.SignedCharTy; 4348 else if (Unsigned) 4349 Type = Context.UnsignedCharTy; 4350 else 4351 Type = Context.CharTy; 4352 break; 4353 case 'b': // boolean 4354 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4355 Type = Context.BoolTy; 4356 break; 4357 case 'z': // size_t. 4358 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4359 Type = Context.getSizeType(); 4360 break; 4361 case 'F': 4362 Type = Context.getCFConstantStringType(); 4363 break; 4364 case 'a': 4365 Type = Context.getBuiltinVaListType(); 4366 assert(!Type.isNull() && "builtin va list type not initialized!"); 4367 break; 4368 case 'A': 4369 // This is a "reference" to a va_list; however, what exactly 4370 // this means depends on how va_list is defined. There are two 4371 // different kinds of va_list: ones passed by value, and ones 4372 // passed by reference. An example of a by-value va_list is 4373 // x86, where va_list is a char*. An example of by-ref va_list 4374 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4375 // we want this argument to be a char*&; for x86-64, we want 4376 // it to be a __va_list_tag*. 4377 Type = Context.getBuiltinVaListType(); 4378 assert(!Type.isNull() && "builtin va list type not initialized!"); 4379 if (Type->isArrayType()) { 4380 Type = Context.getArrayDecayedType(Type); 4381 } else { 4382 Type = Context.getLValueReferenceType(Type); 4383 } 4384 break; 4385 case 'V': { 4386 char *End; 4387 unsigned NumElements = strtoul(Str, &End, 10); 4388 assert(End != Str && "Missing vector size"); 4389 4390 Str = End; 4391 4392 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4393 Type = Context.getVectorType(ElementType, NumElements); 4394 break; 4395 } 4396 case 'X': { 4397 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4398 Type = Context.getComplexType(ElementType); 4399 break; 4400 } 4401 case 'P': 4402 Type = Context.getFILEType(); 4403 if (Type.isNull()) { 4404 Error = ASTContext::GE_Missing_stdio; 4405 return QualType(); 4406 } 4407 break; 4408 case 'J': 4409 if (Signed) 4410 Type = Context.getsigjmp_bufType(); 4411 else 4412 Type = Context.getjmp_bufType(); 4413 4414 if (Type.isNull()) { 4415 Error = ASTContext::GE_Missing_setjmp; 4416 return QualType(); 4417 } 4418 break; 4419 } 4420 4421 if (!AllowTypeModifiers) 4422 return Type; 4423 4424 Done = false; 4425 while (!Done) { 4426 switch (*Str++) { 4427 default: Done = true; --Str; break; 4428 case '*': 4429 Type = Context.getPointerType(Type); 4430 break; 4431 case '&': 4432 Type = Context.getLValueReferenceType(Type); 4433 break; 4434 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4435 case 'C': 4436 Type = Type.withConst(); 4437 break; 4438 } 4439 } 4440 4441 return Type; 4442} 4443 4444/// GetBuiltinType - Return the type for the specified builtin. 4445QualType ASTContext::GetBuiltinType(unsigned id, 4446 GetBuiltinTypeError &Error) { 4447 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4448 4449 llvm::SmallVector<QualType, 8> ArgTypes; 4450 4451 Error = GE_None; 4452 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4453 if (Error != GE_None) 4454 return QualType(); 4455 while (TypeStr[0] && TypeStr[0] != '.') { 4456 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4457 if (Error != GE_None) 4458 return QualType(); 4459 4460 // Do array -> pointer decay. The builtin should use the decayed type. 4461 if (Ty->isArrayType()) 4462 Ty = getArrayDecayedType(Ty); 4463 4464 ArgTypes.push_back(Ty); 4465 } 4466 4467 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4468 "'.' should only occur at end of builtin type list!"); 4469 4470 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4471 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4472 return getFunctionNoProtoType(ResType); 4473 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4474 TypeStr[0] == '.', 0); 4475} 4476 4477QualType 4478ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4479 // Perform the usual unary conversions. We do this early so that 4480 // integral promotions to "int" can allow us to exit early, in the 4481 // lhs == rhs check. Also, for conversion purposes, we ignore any 4482 // qualifiers. For example, "const float" and "float" are 4483 // equivalent. 4484 if (lhs->isPromotableIntegerType()) 4485 lhs = getPromotedIntegerType(lhs); 4486 else 4487 lhs = lhs.getUnqualifiedType(); 4488 if (rhs->isPromotableIntegerType()) 4489 rhs = getPromotedIntegerType(rhs); 4490 else 4491 rhs = rhs.getUnqualifiedType(); 4492 4493 // If both types are identical, no conversion is needed. 4494 if (lhs == rhs) 4495 return lhs; 4496 4497 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4498 // The caller can deal with this (e.g. pointer + int). 4499 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4500 return lhs; 4501 4502 // At this point, we have two different arithmetic types. 4503 4504 // Handle complex types first (C99 6.3.1.8p1). 4505 if (lhs->isComplexType() || rhs->isComplexType()) { 4506 // if we have an integer operand, the result is the complex type. 4507 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4508 // convert the rhs to the lhs complex type. 4509 return lhs; 4510 } 4511 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4512 // convert the lhs to the rhs complex type. 4513 return rhs; 4514 } 4515 // This handles complex/complex, complex/float, or float/complex. 4516 // When both operands are complex, the shorter operand is converted to the 4517 // type of the longer, and that is the type of the result. This corresponds 4518 // to what is done when combining two real floating-point operands. 4519 // The fun begins when size promotion occur across type domains. 4520 // From H&S 6.3.4: When one operand is complex and the other is a real 4521 // floating-point type, the less precise type is converted, within it's 4522 // real or complex domain, to the precision of the other type. For example, 4523 // when combining a "long double" with a "double _Complex", the 4524 // "double _Complex" is promoted to "long double _Complex". 4525 int result = getFloatingTypeOrder(lhs, rhs); 4526 4527 if (result > 0) { // The left side is bigger, convert rhs. 4528 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4529 } else if (result < 0) { // The right side is bigger, convert lhs. 4530 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4531 } 4532 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4533 // domains match. This is a requirement for our implementation, C99 4534 // does not require this promotion. 4535 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4536 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4537 return rhs; 4538 } else { // handle "_Complex double, double". 4539 return lhs; 4540 } 4541 } 4542 return lhs; // The domain/size match exactly. 4543 } 4544 // Now handle "real" floating types (i.e. float, double, long double). 4545 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4546 // if we have an integer operand, the result is the real floating type. 4547 if (rhs->isIntegerType()) { 4548 // convert rhs to the lhs floating point type. 4549 return lhs; 4550 } 4551 if (rhs->isComplexIntegerType()) { 4552 // convert rhs to the complex floating point type. 4553 return getComplexType(lhs); 4554 } 4555 if (lhs->isIntegerType()) { 4556 // convert lhs to the rhs floating point type. 4557 return rhs; 4558 } 4559 if (lhs->isComplexIntegerType()) { 4560 // convert lhs to the complex floating point type. 4561 return getComplexType(rhs); 4562 } 4563 // We have two real floating types, float/complex combos were handled above. 4564 // Convert the smaller operand to the bigger result. 4565 int result = getFloatingTypeOrder(lhs, rhs); 4566 if (result > 0) // convert the rhs 4567 return lhs; 4568 assert(result < 0 && "illegal float comparison"); 4569 return rhs; // convert the lhs 4570 } 4571 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4572 // Handle GCC complex int extension. 4573 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4574 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4575 4576 if (lhsComplexInt && rhsComplexInt) { 4577 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4578 rhsComplexInt->getElementType()) >= 0) 4579 return lhs; // convert the rhs 4580 return rhs; 4581 } else if (lhsComplexInt && rhs->isIntegerType()) { 4582 // convert the rhs to the lhs complex type. 4583 return lhs; 4584 } else if (rhsComplexInt && lhs->isIntegerType()) { 4585 // convert the lhs to the rhs complex type. 4586 return rhs; 4587 } 4588 } 4589 // Finally, we have two differing integer types. 4590 // The rules for this case are in C99 6.3.1.8 4591 int compare = getIntegerTypeOrder(lhs, rhs); 4592 bool lhsSigned = lhs->isSignedIntegerType(), 4593 rhsSigned = rhs->isSignedIntegerType(); 4594 QualType destType; 4595 if (lhsSigned == rhsSigned) { 4596 // Same signedness; use the higher-ranked type 4597 destType = compare >= 0 ? lhs : rhs; 4598 } else if (compare != (lhsSigned ? 1 : -1)) { 4599 // The unsigned type has greater than or equal rank to the 4600 // signed type, so use the unsigned type 4601 destType = lhsSigned ? rhs : lhs; 4602 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4603 // The two types are different widths; if we are here, that 4604 // means the signed type is larger than the unsigned type, so 4605 // use the signed type. 4606 destType = lhsSigned ? lhs : rhs; 4607 } else { 4608 // The signed type is higher-ranked than the unsigned type, 4609 // but isn't actually any bigger (like unsigned int and long 4610 // on most 32-bit systems). Use the unsigned type corresponding 4611 // to the signed type. 4612 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4613 } 4614 return destType; 4615} 4616