ASTContext.cpp revision adaaad3715c9c26cdcfdfe3401a13d7b4423ddcf
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), SourceMgr(SM), LangOpts(LOpts), 44 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 45 Idents(idents), Selectors(sels), 46 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 47 ObjCIdRedefinitionType = QualType(); 48 ObjCClassRedefinitionType = QualType(); 49 if (size_reserve > 0) Types.reserve(size_reserve); 50 TUDecl = TranslationUnitDecl::Create(*this); 51 InitBuiltinTypes(); 52} 53 54ASTContext::~ASTContext() { 55 // Deallocate all the types. 56 while (!Types.empty()) { 57 Types.back()->Destroy(*this); 58 Types.pop_back(); 59 } 60 61 { 62 llvm::FoldingSet<ExtQuals>::iterator 63 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); 64 while (I != E) 65 Deallocate(&*I++); 66 } 67 68 { 69 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 70 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 71 while (I != E) { 72 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 73 delete R; 74 } 75 } 76 77 { 78 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 79 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 80 while (I != E) { 81 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 82 delete R; 83 } 84 } 85 86 // Destroy nested-name-specifiers. 87 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 88 NNS = NestedNameSpecifiers.begin(), 89 NNSEnd = NestedNameSpecifiers.end(); 90 NNS != NNSEnd; 91 /* Increment in loop */) 92 (*NNS++).Destroy(*this); 93 94 if (GlobalNestedNameSpecifier) 95 GlobalNestedNameSpecifier->Destroy(*this); 96 97 TUDecl->Destroy(*this); 98} 99 100void 101ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 102 ExternalSource.reset(Source.take()); 103} 104 105void ASTContext::PrintStats() const { 106 fprintf(stderr, "*** AST Context Stats:\n"); 107 fprintf(stderr, " %d types total.\n", (int)Types.size()); 108 109 unsigned counts[] = { 110#define TYPE(Name, Parent) 0, 111#define ABSTRACT_TYPE(Name, Parent) 112#include "clang/AST/TypeNodes.def" 113 0 // Extra 114 }; 115 116 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 117 Type *T = Types[i]; 118 counts[(unsigned)T->getTypeClass()]++; 119 } 120 121 unsigned Idx = 0; 122 unsigned TotalBytes = 0; 123#define TYPE(Name, Parent) \ 124 if (counts[Idx]) \ 125 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 126 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 127 ++Idx; 128#define ABSTRACT_TYPE(Name, Parent) 129#include "clang/AST/TypeNodes.def" 130 131 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 132 133 if (ExternalSource.get()) { 134 fprintf(stderr, "\n"); 135 ExternalSource->PrintStats(); 136 } 137} 138 139 140void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 141 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 142 R = QualType(Ty, 0); 143 Types.push_back(Ty); 144} 145 146void ASTContext::InitBuiltinTypes() { 147 assert(VoidTy.isNull() && "Context reinitialized?"); 148 149 // C99 6.2.5p19. 150 InitBuiltinType(VoidTy, BuiltinType::Void); 151 152 // C99 6.2.5p2. 153 InitBuiltinType(BoolTy, BuiltinType::Bool); 154 // C99 6.2.5p3. 155 if (LangOpts.CharIsSigned) 156 InitBuiltinType(CharTy, BuiltinType::Char_S); 157 else 158 InitBuiltinType(CharTy, BuiltinType::Char_U); 159 // C99 6.2.5p4. 160 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 161 InitBuiltinType(ShortTy, BuiltinType::Short); 162 InitBuiltinType(IntTy, BuiltinType::Int); 163 InitBuiltinType(LongTy, BuiltinType::Long); 164 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 165 166 // C99 6.2.5p6. 167 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 168 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 169 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 170 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 171 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 172 173 // C99 6.2.5p10. 174 InitBuiltinType(FloatTy, BuiltinType::Float); 175 InitBuiltinType(DoubleTy, BuiltinType::Double); 176 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 177 178 // GNU extension, 128-bit integers. 179 InitBuiltinType(Int128Ty, BuiltinType::Int128); 180 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 181 182 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 183 InitBuiltinType(WCharTy, BuiltinType::WChar); 184 else // C99 185 WCharTy = getFromTargetType(Target.getWCharType()); 186 187 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 188 InitBuiltinType(Char16Ty, BuiltinType::Char16); 189 else // C99 190 Char16Ty = getFromTargetType(Target.getChar16Type()); 191 192 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 193 InitBuiltinType(Char32Ty, BuiltinType::Char32); 194 else // C99 195 Char32Ty = getFromTargetType(Target.getChar32Type()); 196 197 // Placeholder type for functions. 198 InitBuiltinType(OverloadTy, BuiltinType::Overload); 199 200 // Placeholder type for type-dependent expressions whose type is 201 // completely unknown. No code should ever check a type against 202 // DependentTy and users should never see it; however, it is here to 203 // help diagnose failures to properly check for type-dependent 204 // expressions. 205 InitBuiltinType(DependentTy, BuiltinType::Dependent); 206 207 // Placeholder type for C++0x auto declarations whose real type has 208 // not yet been deduced. 209 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 210 211 // C99 6.2.5p11. 212 FloatComplexTy = getComplexType(FloatTy); 213 DoubleComplexTy = getComplexType(DoubleTy); 214 LongDoubleComplexTy = getComplexType(LongDoubleTy); 215 216 BuiltinVaListType = QualType(); 217 218 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 219 ObjCIdTypedefType = QualType(); 220 ObjCClassTypedefType = QualType(); 221 222 // Builtin types for 'id' and 'Class'. 223 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 224 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 225 226 ObjCConstantStringType = QualType(); 227 228 // void * type 229 VoidPtrTy = getPointerType(VoidTy); 230 231 // nullptr type (C++0x 2.14.7) 232 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 233} 234 235MemberSpecializationInfo * 236ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 237 assert(Var->isStaticDataMember() && "Not a static data member"); 238 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 239 = InstantiatedFromStaticDataMember.find(Var); 240 if (Pos == InstantiatedFromStaticDataMember.end()) 241 return 0; 242 243 return Pos->second; 244} 245 246void 247ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 248 TemplateSpecializationKind TSK) { 249 assert(Inst->isStaticDataMember() && "Not a static data member"); 250 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 251 assert(!InstantiatedFromStaticDataMember[Inst] && 252 "Already noted what static data member was instantiated from"); 253 InstantiatedFromStaticDataMember[Inst] 254 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 255} 256 257UnresolvedUsingDecl * 258ASTContext::getInstantiatedFromUnresolvedUsingDecl(UsingDecl *UUD) { 259 llvm::DenseMap<UsingDecl *, UnresolvedUsingDecl *>::iterator Pos 260 = InstantiatedFromUnresolvedUsingDecl.find(UUD); 261 if (Pos == InstantiatedFromUnresolvedUsingDecl.end()) 262 return 0; 263 264 return Pos->second; 265} 266 267void 268ASTContext::setInstantiatedFromUnresolvedUsingDecl(UsingDecl *UD, 269 UnresolvedUsingDecl *UUD) { 270 assert(!InstantiatedFromUnresolvedUsingDecl[UD] && 271 "Already noted what using decl what instantiated from"); 272 InstantiatedFromUnresolvedUsingDecl[UD] = UUD; 273} 274 275FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 276 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 277 = InstantiatedFromUnnamedFieldDecl.find(Field); 278 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 279 return 0; 280 281 return Pos->second; 282} 283 284void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 285 FieldDecl *Tmpl) { 286 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 287 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 288 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 289 "Already noted what unnamed field was instantiated from"); 290 291 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 292} 293 294namespace { 295 class BeforeInTranslationUnit 296 : std::binary_function<SourceRange, SourceRange, bool> { 297 SourceManager *SourceMgr; 298 299 public: 300 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 301 302 bool operator()(SourceRange X, SourceRange Y) { 303 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 304 } 305 }; 306} 307 308/// \brief Determine whether the given comment is a Doxygen-style comment. 309/// 310/// \param Start the start of the comment text. 311/// 312/// \param End the end of the comment text. 313/// 314/// \param Member whether we want to check whether this is a member comment 315/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 316/// we only return true when we find a non-member comment. 317static bool 318isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 319 bool Member = false) { 320 const char *BufferStart 321 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 322 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 323 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 324 325 if (End - Start < 4) 326 return false; 327 328 assert(Start[0] == '/' && "Not a comment?"); 329 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 330 return false; 331 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 332 return false; 333 334 return (Start[3] == '<') == Member; 335} 336 337/// \brief Retrieve the comment associated with the given declaration, if 338/// it has one. 339const char *ASTContext::getCommentForDecl(const Decl *D) { 340 if (!D) 341 return 0; 342 343 // Check whether we have cached a comment string for this declaration 344 // already. 345 llvm::DenseMap<const Decl *, std::string>::iterator Pos 346 = DeclComments.find(D); 347 if (Pos != DeclComments.end()) 348 return Pos->second.c_str(); 349 350 // If we have an external AST source and have not yet loaded comments from 351 // that source, do so now. 352 if (ExternalSource && !LoadedExternalComments) { 353 std::vector<SourceRange> LoadedComments; 354 ExternalSource->ReadComments(LoadedComments); 355 356 if (!LoadedComments.empty()) 357 Comments.insert(Comments.begin(), LoadedComments.begin(), 358 LoadedComments.end()); 359 360 LoadedExternalComments = true; 361 } 362 363 // If there are no comments anywhere, we won't find anything. 364 if (Comments.empty()) 365 return 0; 366 367 // If the declaration doesn't map directly to a location in a file, we 368 // can't find the comment. 369 SourceLocation DeclStartLoc = D->getLocStart(); 370 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 371 return 0; 372 373 // Find the comment that occurs just before this declaration. 374 std::vector<SourceRange>::iterator LastComment 375 = std::lower_bound(Comments.begin(), Comments.end(), 376 SourceRange(DeclStartLoc), 377 BeforeInTranslationUnit(&SourceMgr)); 378 379 // Decompose the location for the start of the declaration and find the 380 // beginning of the file buffer. 381 std::pair<FileID, unsigned> DeclStartDecomp 382 = SourceMgr.getDecomposedLoc(DeclStartLoc); 383 const char *FileBufferStart 384 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 385 386 // First check whether we have a comment for a member. 387 if (LastComment != Comments.end() && 388 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 389 isDoxygenComment(SourceMgr, *LastComment, true)) { 390 std::pair<FileID, unsigned> LastCommentEndDecomp 391 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 392 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 393 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 394 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 395 LastCommentEndDecomp.second)) { 396 // The Doxygen member comment comes after the declaration starts and 397 // is on the same line and in the same file as the declaration. This 398 // is the comment we want. 399 std::string &Result = DeclComments[D]; 400 Result.append(FileBufferStart + 401 SourceMgr.getFileOffset(LastComment->getBegin()), 402 FileBufferStart + LastCommentEndDecomp.second + 1); 403 return Result.c_str(); 404 } 405 } 406 407 if (LastComment == Comments.begin()) 408 return 0; 409 --LastComment; 410 411 // Decompose the end of the comment. 412 std::pair<FileID, unsigned> LastCommentEndDecomp 413 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 414 415 // If the comment and the declaration aren't in the same file, then they 416 // aren't related. 417 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 418 return 0; 419 420 // Check that we actually have a Doxygen comment. 421 if (!isDoxygenComment(SourceMgr, *LastComment)) 422 return 0; 423 424 // Compute the starting line for the declaration and for the end of the 425 // comment (this is expensive). 426 unsigned DeclStartLine 427 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 428 unsigned CommentEndLine 429 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 430 LastCommentEndDecomp.second); 431 432 // If the comment does not end on the line prior to the declaration, then 433 // the comment is not associated with the declaration at all. 434 if (CommentEndLine + 1 != DeclStartLine) 435 return 0; 436 437 // We have a comment, but there may be more comments on the previous lines. 438 // Keep looking so long as the comments are still Doxygen comments and are 439 // still adjacent. 440 unsigned ExpectedLine 441 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 442 std::vector<SourceRange>::iterator FirstComment = LastComment; 443 while (FirstComment != Comments.begin()) { 444 // Look at the previous comment 445 --FirstComment; 446 std::pair<FileID, unsigned> Decomp 447 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 448 449 // If this previous comment is in a different file, we're done. 450 if (Decomp.first != DeclStartDecomp.first) { 451 ++FirstComment; 452 break; 453 } 454 455 // If this comment is not a Doxygen comment, we're done. 456 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 457 ++FirstComment; 458 break; 459 } 460 461 // If the line number is not what we expected, we're done. 462 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 463 if (Line != ExpectedLine) { 464 ++FirstComment; 465 break; 466 } 467 468 // Set the next expected line number. 469 ExpectedLine 470 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 471 } 472 473 // The iterator range [FirstComment, LastComment] contains all of the 474 // BCPL comments that, together, are associated with this declaration. 475 // Form a single comment block string for this declaration that concatenates 476 // all of these comments. 477 std::string &Result = DeclComments[D]; 478 while (FirstComment != LastComment) { 479 std::pair<FileID, unsigned> DecompStart 480 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 481 std::pair<FileID, unsigned> DecompEnd 482 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 483 Result.append(FileBufferStart + DecompStart.second, 484 FileBufferStart + DecompEnd.second + 1); 485 ++FirstComment; 486 } 487 488 // Append the last comment line. 489 Result.append(FileBufferStart + 490 SourceMgr.getFileOffset(LastComment->getBegin()), 491 FileBufferStart + LastCommentEndDecomp.second + 1); 492 return Result.c_str(); 493} 494 495//===----------------------------------------------------------------------===// 496// Type Sizing and Analysis 497//===----------------------------------------------------------------------===// 498 499/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 500/// scalar floating point type. 501const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 502 const BuiltinType *BT = T->getAs<BuiltinType>(); 503 assert(BT && "Not a floating point type!"); 504 switch (BT->getKind()) { 505 default: assert(0 && "Not a floating point type!"); 506 case BuiltinType::Float: return Target.getFloatFormat(); 507 case BuiltinType::Double: return Target.getDoubleFormat(); 508 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 509 } 510} 511 512/// getDeclAlignInBytes - Return a conservative estimate of the alignment of the 513/// specified decl. Note that bitfields do not have a valid alignment, so 514/// this method will assert on them. 515unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 516 unsigned Align = Target.getCharWidth(); 517 518 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 519 Align = std::max(Align, AA->getAlignment()); 520 521 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 522 QualType T = VD->getType(); 523 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 524 unsigned AS = RT->getPointeeType().getAddressSpace(); 525 Align = Target.getPointerAlign(AS); 526 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 527 // Incomplete or function types default to 1. 528 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 529 T = cast<ArrayType>(T)->getElementType(); 530 531 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 532 } 533 } 534 535 return Align / Target.getCharWidth(); 536} 537 538/// getTypeSize - Return the size of the specified type, in bits. This method 539/// does not work on incomplete types. 540/// 541/// FIXME: Pointers into different addr spaces could have different sizes and 542/// alignment requirements: getPointerInfo should take an AddrSpace, this 543/// should take a QualType, &c. 544std::pair<uint64_t, unsigned> 545ASTContext::getTypeInfo(const Type *T) { 546 uint64_t Width=0; 547 unsigned Align=8; 548 switch (T->getTypeClass()) { 549#define TYPE(Class, Base) 550#define ABSTRACT_TYPE(Class, Base) 551#define NON_CANONICAL_TYPE(Class, Base) 552#define DEPENDENT_TYPE(Class, Base) case Type::Class: 553#include "clang/AST/TypeNodes.def" 554 assert(false && "Should not see dependent types"); 555 break; 556 557 case Type::ObjCProtocolList: 558 assert(false && "Should not see protocol list types"); 559 break; 560 561 case Type::FunctionNoProto: 562 case Type::FunctionProto: 563 // GCC extension: alignof(function) = 32 bits 564 Width = 0; 565 Align = 32; 566 break; 567 568 case Type::IncompleteArray: 569 case Type::VariableArray: 570 Width = 0; 571 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 572 break; 573 574 case Type::ConstantArray: { 575 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 576 577 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 578 Width = EltInfo.first*CAT->getSize().getZExtValue(); 579 Align = EltInfo.second; 580 break; 581 } 582 case Type::ExtVector: 583 case Type::Vector: { 584 std::pair<uint64_t, unsigned> EltInfo = 585 getTypeInfo(cast<VectorType>(T)->getElementType()); 586 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 587 Align = Width; 588 // If the alignment is not a power of 2, round up to the next power of 2. 589 // This happens for non-power-of-2 length vectors. 590 // FIXME: this should probably be a target property. 591 Align = 1 << llvm::Log2_32_Ceil(Align); 592 break; 593 } 594 595 case Type::Builtin: 596 switch (cast<BuiltinType>(T)->getKind()) { 597 default: assert(0 && "Unknown builtin type!"); 598 case BuiltinType::Void: 599 // GCC extension: alignof(void) = 8 bits. 600 Width = 0; 601 Align = 8; 602 break; 603 604 case BuiltinType::Bool: 605 Width = Target.getBoolWidth(); 606 Align = Target.getBoolAlign(); 607 break; 608 case BuiltinType::Char_S: 609 case BuiltinType::Char_U: 610 case BuiltinType::UChar: 611 case BuiltinType::SChar: 612 Width = Target.getCharWidth(); 613 Align = Target.getCharAlign(); 614 break; 615 case BuiltinType::WChar: 616 Width = Target.getWCharWidth(); 617 Align = Target.getWCharAlign(); 618 break; 619 case BuiltinType::Char16: 620 Width = Target.getChar16Width(); 621 Align = Target.getChar16Align(); 622 break; 623 case BuiltinType::Char32: 624 Width = Target.getChar32Width(); 625 Align = Target.getChar32Align(); 626 break; 627 case BuiltinType::UShort: 628 case BuiltinType::Short: 629 Width = Target.getShortWidth(); 630 Align = Target.getShortAlign(); 631 break; 632 case BuiltinType::UInt: 633 case BuiltinType::Int: 634 Width = Target.getIntWidth(); 635 Align = Target.getIntAlign(); 636 break; 637 case BuiltinType::ULong: 638 case BuiltinType::Long: 639 Width = Target.getLongWidth(); 640 Align = Target.getLongAlign(); 641 break; 642 case BuiltinType::ULongLong: 643 case BuiltinType::LongLong: 644 Width = Target.getLongLongWidth(); 645 Align = Target.getLongLongAlign(); 646 break; 647 case BuiltinType::Int128: 648 case BuiltinType::UInt128: 649 Width = 128; 650 Align = 128; // int128_t is 128-bit aligned on all targets. 651 break; 652 case BuiltinType::Float: 653 Width = Target.getFloatWidth(); 654 Align = Target.getFloatAlign(); 655 break; 656 case BuiltinType::Double: 657 Width = Target.getDoubleWidth(); 658 Align = Target.getDoubleAlign(); 659 break; 660 case BuiltinType::LongDouble: 661 Width = Target.getLongDoubleWidth(); 662 Align = Target.getLongDoubleAlign(); 663 break; 664 case BuiltinType::NullPtr: 665 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 666 Align = Target.getPointerAlign(0); // == sizeof(void*) 667 break; 668 } 669 break; 670 case Type::FixedWidthInt: 671 // FIXME: This isn't precisely correct; the width/alignment should depend 672 // on the available types for the target 673 Width = cast<FixedWidthIntType>(T)->getWidth(); 674 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 675 Align = Width; 676 break; 677 case Type::ObjCObjectPointer: 678 Width = Target.getPointerWidth(0); 679 Align = Target.getPointerAlign(0); 680 break; 681 case Type::BlockPointer: { 682 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 683 Width = Target.getPointerWidth(AS); 684 Align = Target.getPointerAlign(AS); 685 break; 686 } 687 case Type::Pointer: { 688 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 689 Width = Target.getPointerWidth(AS); 690 Align = Target.getPointerAlign(AS); 691 break; 692 } 693 case Type::LValueReference: 694 case Type::RValueReference: 695 // "When applied to a reference or a reference type, the result is the size 696 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 697 // FIXME: This is wrong for struct layout: a reference in a struct has 698 // pointer size. 699 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 700 case Type::MemberPointer: { 701 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 702 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 703 // If we ever want to support other ABIs this needs to be abstracted. 704 705 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 706 std::pair<uint64_t, unsigned> PtrDiffInfo = 707 getTypeInfo(getPointerDiffType()); 708 Width = PtrDiffInfo.first; 709 if (Pointee->isFunctionType()) 710 Width *= 2; 711 Align = PtrDiffInfo.second; 712 break; 713 } 714 case Type::Complex: { 715 // Complex types have the same alignment as their elements, but twice the 716 // size. 717 std::pair<uint64_t, unsigned> EltInfo = 718 getTypeInfo(cast<ComplexType>(T)->getElementType()); 719 Width = EltInfo.first*2; 720 Align = EltInfo.second; 721 break; 722 } 723 case Type::ObjCInterface: { 724 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 725 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 726 Width = Layout.getSize(); 727 Align = Layout.getAlignment(); 728 break; 729 } 730 case Type::Record: 731 case Type::Enum: { 732 const TagType *TT = cast<TagType>(T); 733 734 if (TT->getDecl()->isInvalidDecl()) { 735 Width = 1; 736 Align = 1; 737 break; 738 } 739 740 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 741 return getTypeInfo(ET->getDecl()->getIntegerType()); 742 743 const RecordType *RT = cast<RecordType>(TT); 744 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 745 Width = Layout.getSize(); 746 Align = Layout.getAlignment(); 747 break; 748 } 749 750 case Type::SubstTemplateTypeParm: { 751 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 752 getReplacementType().getTypePtr()); 753 } 754 755 case Type::Elaborated: { 756 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType().getTypePtr()); 757 } 758 759 case Type::Typedef: { 760 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 761 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 762 Align = Aligned->getAlignment(); 763 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 764 } else 765 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 766 break; 767 } 768 769 case Type::TypeOfExpr: 770 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 771 .getTypePtr()); 772 773 case Type::TypeOf: 774 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 775 776 case Type::Decltype: 777 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 778 .getTypePtr()); 779 780 case Type::QualifiedName: 781 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 782 783 case Type::TemplateSpecialization: 784 assert(getCanonicalType(T) != T && 785 "Cannot request the size of a dependent type"); 786 // FIXME: this is likely to be wrong once we support template 787 // aliases, since a template alias could refer to a typedef that 788 // has an __aligned__ attribute on it. 789 return getTypeInfo(getCanonicalType(T)); 790 } 791 792 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 793 return std::make_pair(Width, Align); 794} 795 796/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 797/// type for the current target in bits. This can be different than the ABI 798/// alignment in cases where it is beneficial for performance to overalign 799/// a data type. 800unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 801 unsigned ABIAlign = getTypeAlign(T); 802 803 // Double and long long should be naturally aligned if possible. 804 if (const ComplexType* CT = T->getAs<ComplexType>()) 805 T = CT->getElementType().getTypePtr(); 806 if (T->isSpecificBuiltinType(BuiltinType::Double) || 807 T->isSpecificBuiltinType(BuiltinType::LongLong)) 808 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 809 810 return ABIAlign; 811} 812 813static void CollectLocalObjCIvars(ASTContext *Ctx, 814 const ObjCInterfaceDecl *OI, 815 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 816 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 817 E = OI->ivar_end(); I != E; ++I) { 818 ObjCIvarDecl *IVDecl = *I; 819 if (!IVDecl->isInvalidDecl()) 820 Fields.push_back(cast<FieldDecl>(IVDecl)); 821 } 822} 823 824void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 825 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 826 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 827 CollectObjCIvars(SuperClass, Fields); 828 CollectLocalObjCIvars(this, OI, Fields); 829} 830 831/// ShallowCollectObjCIvars - 832/// Collect all ivars, including those synthesized, in the current class. 833/// 834void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 835 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 836 bool CollectSynthesized) { 837 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 838 E = OI->ivar_end(); I != E; ++I) { 839 Ivars.push_back(*I); 840 } 841 if (CollectSynthesized) 842 CollectSynthesizedIvars(OI, Ivars); 843} 844 845void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 846 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 847 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 848 E = PD->prop_end(); I != E; ++I) 849 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 850 Ivars.push_back(Ivar); 851 852 // Also look into nested protocols. 853 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 854 E = PD->protocol_end(); P != E; ++P) 855 CollectProtocolSynthesizedIvars(*P, Ivars); 856} 857 858/// CollectSynthesizedIvars - 859/// This routine collect synthesized ivars for the designated class. 860/// 861void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 862 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 863 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 864 E = OI->prop_end(); I != E; ++I) { 865 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 866 Ivars.push_back(Ivar); 867 } 868 // Also look into interface's protocol list for properties declared 869 // in the protocol and whose ivars are synthesized. 870 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 871 PE = OI->protocol_end(); P != PE; ++P) { 872 ObjCProtocolDecl *PD = (*P); 873 CollectProtocolSynthesizedIvars(PD, Ivars); 874 } 875} 876 877unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 878 unsigned count = 0; 879 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 880 E = PD->prop_end(); I != E; ++I) 881 if ((*I)->getPropertyIvarDecl()) 882 ++count; 883 884 // Also look into nested protocols. 885 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 886 E = PD->protocol_end(); P != E; ++P) 887 count += CountProtocolSynthesizedIvars(*P); 888 return count; 889} 890 891unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) { 892 unsigned count = 0; 893 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 894 E = OI->prop_end(); I != E; ++I) { 895 if ((*I)->getPropertyIvarDecl()) 896 ++count; 897 } 898 // Also look into interface's protocol list for properties declared 899 // in the protocol and whose ivars are synthesized. 900 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 901 PE = OI->protocol_end(); P != PE; ++P) { 902 ObjCProtocolDecl *PD = (*P); 903 count += CountProtocolSynthesizedIvars(PD); 904 } 905 return count; 906} 907 908/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 909ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 910 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 911 I = ObjCImpls.find(D); 912 if (I != ObjCImpls.end()) 913 return cast<ObjCImplementationDecl>(I->second); 914 return 0; 915} 916/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 917ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 918 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 919 I = ObjCImpls.find(D); 920 if (I != ObjCImpls.end()) 921 return cast<ObjCCategoryImplDecl>(I->second); 922 return 0; 923} 924 925/// \brief Set the implementation of ObjCInterfaceDecl. 926void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 927 ObjCImplementationDecl *ImplD) { 928 assert(IFaceD && ImplD && "Passed null params"); 929 ObjCImpls[IFaceD] = ImplD; 930} 931/// \brief Set the implementation of ObjCCategoryDecl. 932void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 933 ObjCCategoryImplDecl *ImplD) { 934 assert(CatD && ImplD && "Passed null params"); 935 ObjCImpls[CatD] = ImplD; 936} 937 938/// \brief Allocate an uninitialized DeclaratorInfo. 939/// 940/// The caller should initialize the memory held by DeclaratorInfo using 941/// the TypeLoc wrappers. 942/// 943/// \param T the type that will be the basis for type source info. This type 944/// should refer to how the declarator was written in source code, not to 945/// what type semantic analysis resolved the declarator to. 946DeclaratorInfo *ASTContext::CreateDeclaratorInfo(QualType T) { 947 unsigned DataSize = TypeLoc::getFullDataSizeForType(T); 948 DeclaratorInfo *DInfo = 949 (DeclaratorInfo*)BumpAlloc.Allocate(sizeof(DeclaratorInfo) + DataSize, 8); 950 new (DInfo) DeclaratorInfo(T); 951 return DInfo; 952} 953 954/// getInterfaceLayoutImpl - Get or compute information about the 955/// layout of the given interface. 956/// 957/// \param Impl - If given, also include the layout of the interface's 958/// implementation. This may differ by including synthesized ivars. 959const ASTRecordLayout & 960ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 961 const ObjCImplementationDecl *Impl) { 962 assert(!D->isForwardDecl() && "Invalid interface decl!"); 963 964 // Look up this layout, if already laid out, return what we have. 965 ObjCContainerDecl *Key = 966 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 967 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 968 return *Entry; 969 970 // Add in synthesized ivar count if laying out an implementation. 971 if (Impl) { 972 unsigned FieldCount = D->ivar_size(); 973 unsigned SynthCount = CountSynthesizedIvars(D); 974 FieldCount += SynthCount; 975 // If there aren't any sythesized ivars then reuse the interface 976 // entry. Note we can't cache this because we simply free all 977 // entries later; however we shouldn't look up implementations 978 // frequently. 979 if (SynthCount == 0) 980 return getObjCLayout(D, 0); 981 } 982 983 const ASTRecordLayout *NewEntry = 984 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 985 ObjCLayouts[Key] = NewEntry; 986 987 return *NewEntry; 988} 989 990const ASTRecordLayout & 991ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 992 return getObjCLayout(D, 0); 993} 994 995const ASTRecordLayout & 996ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 997 return getObjCLayout(D->getClassInterface(), D); 998} 999 1000/// getASTRecordLayout - Get or compute information about the layout of the 1001/// specified record (struct/union/class), which indicates its size and field 1002/// position information. 1003const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 1004 D = D->getDefinition(*this); 1005 assert(D && "Cannot get layout of forward declarations!"); 1006 1007 // Look up this layout, if already laid out, return what we have. 1008 // Note that we can't save a reference to the entry because this function 1009 // is recursive. 1010 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 1011 if (Entry) return *Entry; 1012 1013 const ASTRecordLayout *NewEntry = 1014 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 1015 ASTRecordLayouts[D] = NewEntry; 1016 1017 return *NewEntry; 1018} 1019 1020//===----------------------------------------------------------------------===// 1021// Type creation/memoization methods 1022//===----------------------------------------------------------------------===// 1023 1024QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1025 unsigned Fast = Quals.getFastQualifiers(); 1026 Quals.removeFastQualifiers(); 1027 1028 // Check if we've already instantiated this type. 1029 llvm::FoldingSetNodeID ID; 1030 ExtQuals::Profile(ID, TypeNode, Quals); 1031 void *InsertPos = 0; 1032 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1033 assert(EQ->getQualifiers() == Quals); 1034 QualType T = QualType(EQ, Fast); 1035 return T; 1036 } 1037 1038 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1039 ExtQualNodes.InsertNode(New, InsertPos); 1040 QualType T = QualType(New, Fast); 1041 return T; 1042} 1043 1044QualType ASTContext::getVolatileType(QualType T) { 1045 QualType CanT = getCanonicalType(T); 1046 if (CanT.isVolatileQualified()) return T; 1047 1048 QualifierCollector Quals; 1049 const Type *TypeNode = Quals.strip(T); 1050 Quals.addVolatile(); 1051 1052 return getExtQualType(TypeNode, Quals); 1053} 1054 1055QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1056 QualType CanT = getCanonicalType(T); 1057 if (CanT.getAddressSpace() == AddressSpace) 1058 return T; 1059 1060 // If we are composing extended qualifiers together, merge together 1061 // into one ExtQuals node. 1062 QualifierCollector Quals; 1063 const Type *TypeNode = Quals.strip(T); 1064 1065 // If this type already has an address space specified, it cannot get 1066 // another one. 1067 assert(!Quals.hasAddressSpace() && 1068 "Type cannot be in multiple addr spaces!"); 1069 Quals.addAddressSpace(AddressSpace); 1070 1071 return getExtQualType(TypeNode, Quals); 1072} 1073 1074QualType ASTContext::getObjCGCQualType(QualType T, 1075 Qualifiers::GC GCAttr) { 1076 QualType CanT = getCanonicalType(T); 1077 if (CanT.getObjCGCAttr() == GCAttr) 1078 return T; 1079 1080 if (T->isPointerType()) { 1081 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1082 if (Pointee->isAnyPointerType()) { 1083 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1084 return getPointerType(ResultType); 1085 } 1086 } 1087 1088 // If we are composing extended qualifiers together, merge together 1089 // into one ExtQuals node. 1090 QualifierCollector Quals; 1091 const Type *TypeNode = Quals.strip(T); 1092 1093 // If this type already has an ObjCGC specified, it cannot get 1094 // another one. 1095 assert(!Quals.hasObjCGCAttr() && 1096 "Type cannot have multiple ObjCGCs!"); 1097 Quals.addObjCGCAttr(GCAttr); 1098 1099 return getExtQualType(TypeNode, Quals); 1100} 1101 1102QualType ASTContext::getNoReturnType(QualType T) { 1103 QualType ResultType; 1104 if (T->isPointerType()) { 1105 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1106 ResultType = getNoReturnType(Pointee); 1107 ResultType = getPointerType(ResultType); 1108 } else if (T->isBlockPointerType()) { 1109 QualType Pointee = T->getAs<BlockPointerType>()->getPointeeType(); 1110 ResultType = getNoReturnType(Pointee); 1111 ResultType = getBlockPointerType(ResultType); 1112 } else { 1113 assert (T->isFunctionType() 1114 && "can't noreturn qualify non-pointer to function or block type"); 1115 1116 if (const FunctionNoProtoType *FNPT = T->getAs<FunctionNoProtoType>()) { 1117 ResultType = getFunctionNoProtoType(FNPT->getResultType(), true); 1118 } else { 1119 const FunctionProtoType *F = T->getAs<FunctionProtoType>(); 1120 ResultType 1121 = getFunctionType(F->getResultType(), F->arg_type_begin(), 1122 F->getNumArgs(), F->isVariadic(), F->getTypeQuals(), 1123 F->hasExceptionSpec(), F->hasAnyExceptionSpec(), 1124 F->getNumExceptions(), F->exception_begin(), true); 1125 } 1126 } 1127 1128 return getQualifiedType(ResultType, T.getQualifiers()); 1129} 1130 1131/// getComplexType - Return the uniqued reference to the type for a complex 1132/// number with the specified element type. 1133QualType ASTContext::getComplexType(QualType T) { 1134 // Unique pointers, to guarantee there is only one pointer of a particular 1135 // structure. 1136 llvm::FoldingSetNodeID ID; 1137 ComplexType::Profile(ID, T); 1138 1139 void *InsertPos = 0; 1140 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1141 return QualType(CT, 0); 1142 1143 // If the pointee type isn't canonical, this won't be a canonical type either, 1144 // so fill in the canonical type field. 1145 QualType Canonical; 1146 if (!T->isCanonical()) { 1147 Canonical = getComplexType(getCanonicalType(T)); 1148 1149 // Get the new insert position for the node we care about. 1150 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1151 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1152 } 1153 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1154 Types.push_back(New); 1155 ComplexTypes.InsertNode(New, InsertPos); 1156 return QualType(New, 0); 1157} 1158 1159QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1160 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1161 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1162 FixedWidthIntType *&Entry = Map[Width]; 1163 if (!Entry) 1164 Entry = new FixedWidthIntType(Width, Signed); 1165 return QualType(Entry, 0); 1166} 1167 1168/// getPointerType - Return the uniqued reference to the type for a pointer to 1169/// the specified type. 1170QualType ASTContext::getPointerType(QualType T) { 1171 // Unique pointers, to guarantee there is only one pointer of a particular 1172 // structure. 1173 llvm::FoldingSetNodeID ID; 1174 PointerType::Profile(ID, T); 1175 1176 void *InsertPos = 0; 1177 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1178 return QualType(PT, 0); 1179 1180 // If the pointee type isn't canonical, this won't be a canonical type either, 1181 // so fill in the canonical type field. 1182 QualType Canonical; 1183 if (!T->isCanonical()) { 1184 Canonical = getPointerType(getCanonicalType(T)); 1185 1186 // Get the new insert position for the node we care about. 1187 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1188 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1189 } 1190 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1191 Types.push_back(New); 1192 PointerTypes.InsertNode(New, InsertPos); 1193 return QualType(New, 0); 1194} 1195 1196/// getBlockPointerType - Return the uniqued reference to the type for 1197/// a pointer to the specified block. 1198QualType ASTContext::getBlockPointerType(QualType T) { 1199 assert(T->isFunctionType() && "block of function types only"); 1200 // Unique pointers, to guarantee there is only one block of a particular 1201 // structure. 1202 llvm::FoldingSetNodeID ID; 1203 BlockPointerType::Profile(ID, T); 1204 1205 void *InsertPos = 0; 1206 if (BlockPointerType *PT = 1207 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1208 return QualType(PT, 0); 1209 1210 // If the block pointee type isn't canonical, this won't be a canonical 1211 // type either so fill in the canonical type field. 1212 QualType Canonical; 1213 if (!T->isCanonical()) { 1214 Canonical = getBlockPointerType(getCanonicalType(T)); 1215 1216 // Get the new insert position for the node we care about. 1217 BlockPointerType *NewIP = 1218 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1219 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1220 } 1221 BlockPointerType *New 1222 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1223 Types.push_back(New); 1224 BlockPointerTypes.InsertNode(New, InsertPos); 1225 return QualType(New, 0); 1226} 1227 1228/// getLValueReferenceType - Return the uniqued reference to the type for an 1229/// lvalue reference to the specified type. 1230QualType ASTContext::getLValueReferenceType(QualType T) { 1231 // Unique pointers, to guarantee there is only one pointer of a particular 1232 // structure. 1233 llvm::FoldingSetNodeID ID; 1234 ReferenceType::Profile(ID, T); 1235 1236 void *InsertPos = 0; 1237 if (LValueReferenceType *RT = 1238 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1239 return QualType(RT, 0); 1240 1241 // If the referencee type isn't canonical, this won't be a canonical type 1242 // either, so fill in the canonical type field. 1243 QualType Canonical; 1244 if (!T->isCanonical()) { 1245 Canonical = getLValueReferenceType(getCanonicalType(T)); 1246 1247 // Get the new insert position for the node we care about. 1248 LValueReferenceType *NewIP = 1249 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1250 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1251 } 1252 1253 LValueReferenceType *New 1254 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical); 1255 Types.push_back(New); 1256 LValueReferenceTypes.InsertNode(New, InsertPos); 1257 return QualType(New, 0); 1258} 1259 1260/// getRValueReferenceType - Return the uniqued reference to the type for an 1261/// rvalue reference to the specified type. 1262QualType ASTContext::getRValueReferenceType(QualType T) { 1263 // Unique pointers, to guarantee there is only one pointer of a particular 1264 // structure. 1265 llvm::FoldingSetNodeID ID; 1266 ReferenceType::Profile(ID, T); 1267 1268 void *InsertPos = 0; 1269 if (RValueReferenceType *RT = 1270 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1271 return QualType(RT, 0); 1272 1273 // If the referencee type isn't canonical, this won't be a canonical type 1274 // either, so fill in the canonical type field. 1275 QualType Canonical; 1276 if (!T->isCanonical()) { 1277 Canonical = getRValueReferenceType(getCanonicalType(T)); 1278 1279 // Get the new insert position for the node we care about. 1280 RValueReferenceType *NewIP = 1281 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1282 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1283 } 1284 1285 RValueReferenceType *New 1286 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1287 Types.push_back(New); 1288 RValueReferenceTypes.InsertNode(New, InsertPos); 1289 return QualType(New, 0); 1290} 1291 1292/// getMemberPointerType - Return the uniqued reference to the type for a 1293/// member pointer to the specified type, in the specified class. 1294QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1295 // Unique pointers, to guarantee there is only one pointer of a particular 1296 // structure. 1297 llvm::FoldingSetNodeID ID; 1298 MemberPointerType::Profile(ID, T, Cls); 1299 1300 void *InsertPos = 0; 1301 if (MemberPointerType *PT = 1302 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1303 return QualType(PT, 0); 1304 1305 // If the pointee or class type isn't canonical, this won't be a canonical 1306 // type either, so fill in the canonical type field. 1307 QualType Canonical; 1308 if (!T->isCanonical()) { 1309 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1310 1311 // Get the new insert position for the node we care about. 1312 MemberPointerType *NewIP = 1313 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1314 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1315 } 1316 MemberPointerType *New 1317 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1318 Types.push_back(New); 1319 MemberPointerTypes.InsertNode(New, InsertPos); 1320 return QualType(New, 0); 1321} 1322 1323/// getConstantArrayType - Return the unique reference to the type for an 1324/// array of the specified element type. 1325QualType ASTContext::getConstantArrayType(QualType EltTy, 1326 const llvm::APInt &ArySizeIn, 1327 ArrayType::ArraySizeModifier ASM, 1328 unsigned EltTypeQuals) { 1329 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1330 "Constant array of VLAs is illegal!"); 1331 1332 // Convert the array size into a canonical width matching the pointer size for 1333 // the target. 1334 llvm::APInt ArySize(ArySizeIn); 1335 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1336 1337 llvm::FoldingSetNodeID ID; 1338 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1339 1340 void *InsertPos = 0; 1341 if (ConstantArrayType *ATP = 1342 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1343 return QualType(ATP, 0); 1344 1345 // If the element type isn't canonical, this won't be a canonical type either, 1346 // so fill in the canonical type field. 1347 QualType Canonical; 1348 if (!EltTy->isCanonical()) { 1349 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1350 ASM, EltTypeQuals); 1351 // Get the new insert position for the node we care about. 1352 ConstantArrayType *NewIP = 1353 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1354 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1355 } 1356 1357 ConstantArrayType *New = new(*this,TypeAlignment) 1358 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1359 ConstantArrayTypes.InsertNode(New, InsertPos); 1360 Types.push_back(New); 1361 return QualType(New, 0); 1362} 1363 1364/// getVariableArrayType - Returns a non-unique reference to the type for a 1365/// variable array of the specified element type. 1366QualType ASTContext::getVariableArrayType(QualType EltTy, 1367 Expr *NumElts, 1368 ArrayType::ArraySizeModifier ASM, 1369 unsigned EltTypeQuals, 1370 SourceRange Brackets) { 1371 // Since we don't unique expressions, it isn't possible to unique VLA's 1372 // that have an expression provided for their size. 1373 1374 VariableArrayType *New = new(*this, TypeAlignment) 1375 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1376 1377 VariableArrayTypes.push_back(New); 1378 Types.push_back(New); 1379 return QualType(New, 0); 1380} 1381 1382/// getDependentSizedArrayType - Returns a non-unique reference to 1383/// the type for a dependently-sized array of the specified element 1384/// type. 1385QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1386 Expr *NumElts, 1387 ArrayType::ArraySizeModifier ASM, 1388 unsigned EltTypeQuals, 1389 SourceRange Brackets) { 1390 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1391 "Size must be type- or value-dependent!"); 1392 1393 llvm::FoldingSetNodeID ID; 1394 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1395 EltTypeQuals, NumElts); 1396 1397 void *InsertPos = 0; 1398 DependentSizedArrayType *Canon 1399 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1400 DependentSizedArrayType *New; 1401 if (Canon) { 1402 // We already have a canonical version of this array type; use it as 1403 // the canonical type for a newly-built type. 1404 New = new (*this, TypeAlignment) 1405 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1406 NumElts, ASM, EltTypeQuals, Brackets); 1407 } else { 1408 QualType CanonEltTy = getCanonicalType(EltTy); 1409 if (CanonEltTy == EltTy) { 1410 New = new (*this, TypeAlignment) 1411 DependentSizedArrayType(*this, EltTy, QualType(), 1412 NumElts, ASM, EltTypeQuals, Brackets); 1413 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1414 } else { 1415 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1416 ASM, EltTypeQuals, 1417 SourceRange()); 1418 New = new (*this, TypeAlignment) 1419 DependentSizedArrayType(*this, EltTy, Canon, 1420 NumElts, ASM, EltTypeQuals, Brackets); 1421 } 1422 } 1423 1424 Types.push_back(New); 1425 return QualType(New, 0); 1426} 1427 1428QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1429 ArrayType::ArraySizeModifier ASM, 1430 unsigned EltTypeQuals) { 1431 llvm::FoldingSetNodeID ID; 1432 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1433 1434 void *InsertPos = 0; 1435 if (IncompleteArrayType *ATP = 1436 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1437 return QualType(ATP, 0); 1438 1439 // If the element type isn't canonical, this won't be a canonical type 1440 // either, so fill in the canonical type field. 1441 QualType Canonical; 1442 1443 if (!EltTy->isCanonical()) { 1444 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1445 ASM, EltTypeQuals); 1446 1447 // Get the new insert position for the node we care about. 1448 IncompleteArrayType *NewIP = 1449 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1450 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1451 } 1452 1453 IncompleteArrayType *New = new (*this, TypeAlignment) 1454 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1455 1456 IncompleteArrayTypes.InsertNode(New, InsertPos); 1457 Types.push_back(New); 1458 return QualType(New, 0); 1459} 1460 1461/// getVectorType - Return the unique reference to a vector type of 1462/// the specified element type and size. VectorType must be a built-in type. 1463QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1464 BuiltinType *baseType; 1465 1466 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1467 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1468 1469 // Check if we've already instantiated a vector of this type. 1470 llvm::FoldingSetNodeID ID; 1471 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1472 void *InsertPos = 0; 1473 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1474 return QualType(VTP, 0); 1475 1476 // If the element type isn't canonical, this won't be a canonical type either, 1477 // so fill in the canonical type field. 1478 QualType Canonical; 1479 if (!vecType->isCanonical()) { 1480 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1481 1482 // Get the new insert position for the node we care about. 1483 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1484 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1485 } 1486 VectorType *New = new (*this, TypeAlignment) 1487 VectorType(vecType, NumElts, Canonical); 1488 VectorTypes.InsertNode(New, InsertPos); 1489 Types.push_back(New); 1490 return QualType(New, 0); 1491} 1492 1493/// getExtVectorType - Return the unique reference to an extended vector type of 1494/// the specified element type and size. VectorType must be a built-in type. 1495QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1496 BuiltinType *baseType; 1497 1498 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1499 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1500 1501 // Check if we've already instantiated a vector of this type. 1502 llvm::FoldingSetNodeID ID; 1503 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1504 void *InsertPos = 0; 1505 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1506 return QualType(VTP, 0); 1507 1508 // If the element type isn't canonical, this won't be a canonical type either, 1509 // so fill in the canonical type field. 1510 QualType Canonical; 1511 if (!vecType->isCanonical()) { 1512 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1513 1514 // Get the new insert position for the node we care about. 1515 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1516 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1517 } 1518 ExtVectorType *New = new (*this, TypeAlignment) 1519 ExtVectorType(vecType, NumElts, Canonical); 1520 VectorTypes.InsertNode(New, InsertPos); 1521 Types.push_back(New); 1522 return QualType(New, 0); 1523} 1524 1525QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1526 Expr *SizeExpr, 1527 SourceLocation AttrLoc) { 1528 llvm::FoldingSetNodeID ID; 1529 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1530 SizeExpr); 1531 1532 void *InsertPos = 0; 1533 DependentSizedExtVectorType *Canon 1534 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1535 DependentSizedExtVectorType *New; 1536 if (Canon) { 1537 // We already have a canonical version of this array type; use it as 1538 // the canonical type for a newly-built type. 1539 New = new (*this, TypeAlignment) 1540 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1541 SizeExpr, AttrLoc); 1542 } else { 1543 QualType CanonVecTy = getCanonicalType(vecType); 1544 if (CanonVecTy == vecType) { 1545 New = new (*this, TypeAlignment) 1546 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1547 AttrLoc); 1548 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1549 } else { 1550 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1551 SourceLocation()); 1552 New = new (*this, TypeAlignment) 1553 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1554 } 1555 } 1556 1557 Types.push_back(New); 1558 return QualType(New, 0); 1559} 1560 1561/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1562/// 1563QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1564 // Unique functions, to guarantee there is only one function of a particular 1565 // structure. 1566 llvm::FoldingSetNodeID ID; 1567 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1568 1569 void *InsertPos = 0; 1570 if (FunctionNoProtoType *FT = 1571 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1572 return QualType(FT, 0); 1573 1574 QualType Canonical; 1575 if (!ResultTy->isCanonical()) { 1576 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1577 1578 // Get the new insert position for the node we care about. 1579 FunctionNoProtoType *NewIP = 1580 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1581 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1582 } 1583 1584 FunctionNoProtoType *New = new (*this, TypeAlignment) 1585 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1586 Types.push_back(New); 1587 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1588 return QualType(New, 0); 1589} 1590 1591/// getFunctionType - Return a normal function type with a typed argument 1592/// list. isVariadic indicates whether the argument list includes '...'. 1593QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1594 unsigned NumArgs, bool isVariadic, 1595 unsigned TypeQuals, bool hasExceptionSpec, 1596 bool hasAnyExceptionSpec, unsigned NumExs, 1597 const QualType *ExArray, bool NoReturn) { 1598 if (LangOpts.CPlusPlus) { 1599 for (unsigned i = 0; i != NumArgs; ++i) 1600 assert(!ArgArray[i].hasQualifiers() && 1601 "C++ arguments can't have toplevel qualifiers!"); 1602 } 1603 1604 // Unique functions, to guarantee there is only one function of a particular 1605 // structure. 1606 llvm::FoldingSetNodeID ID; 1607 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1608 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1609 NumExs, ExArray, NoReturn); 1610 1611 void *InsertPos = 0; 1612 if (FunctionProtoType *FTP = 1613 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1614 return QualType(FTP, 0); 1615 1616 // Determine whether the type being created is already canonical or not. 1617 bool isCanonical = ResultTy->isCanonical(); 1618 if (hasExceptionSpec) 1619 isCanonical = false; 1620 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1621 if (!ArgArray[i]->isCanonical()) 1622 isCanonical = false; 1623 1624 // If this type isn't canonical, get the canonical version of it. 1625 // The exception spec is not part of the canonical type. 1626 QualType Canonical; 1627 if (!isCanonical) { 1628 llvm::SmallVector<QualType, 16> CanonicalArgs; 1629 CanonicalArgs.reserve(NumArgs); 1630 for (unsigned i = 0; i != NumArgs; ++i) 1631 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1632 1633 Canonical = getFunctionType(getCanonicalType(ResultTy), 1634 CanonicalArgs.data(), NumArgs, 1635 isVariadic, TypeQuals, false, 1636 false, 0, 0, NoReturn); 1637 1638 // Get the new insert position for the node we care about. 1639 FunctionProtoType *NewIP = 1640 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1641 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1642 } 1643 1644 // FunctionProtoType objects are allocated with extra bytes after them 1645 // for two variable size arrays (for parameter and exception types) at the 1646 // end of them. 1647 FunctionProtoType *FTP = 1648 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1649 NumArgs*sizeof(QualType) + 1650 NumExs*sizeof(QualType), TypeAlignment); 1651 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1652 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1653 ExArray, NumExs, Canonical, NoReturn); 1654 Types.push_back(FTP); 1655 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1656 return QualType(FTP, 0); 1657} 1658 1659/// getTypeDeclType - Return the unique reference to the type for the 1660/// specified type declaration. 1661QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1662 assert(Decl && "Passed null for Decl param"); 1663 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1664 1665 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1666 return getTypedefType(Typedef); 1667 else if (isa<TemplateTypeParmDecl>(Decl)) { 1668 assert(false && "Template type parameter types are always available."); 1669 } else if (ObjCInterfaceDecl *ObjCInterface 1670 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1671 return getObjCInterfaceType(ObjCInterface); 1672 1673 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1674 if (PrevDecl) 1675 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1676 else 1677 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1678 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1679 if (PrevDecl) 1680 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1681 else 1682 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1683 } else 1684 assert(false && "TypeDecl without a type?"); 1685 1686 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1687 return QualType(Decl->TypeForDecl, 0); 1688} 1689 1690/// getTypedefType - Return the unique reference to the type for the 1691/// specified typename decl. 1692QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1693 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1694 1695 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1696 Decl->TypeForDecl = new(*this, TypeAlignment) 1697 TypedefType(Type::Typedef, Decl, Canonical); 1698 Types.push_back(Decl->TypeForDecl); 1699 return QualType(Decl->TypeForDecl, 0); 1700} 1701 1702/// \brief Retrieve a substitution-result type. 1703QualType 1704ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1705 QualType Replacement) { 1706 assert(Replacement->isCanonical() 1707 && "replacement types must always be canonical"); 1708 1709 llvm::FoldingSetNodeID ID; 1710 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1711 void *InsertPos = 0; 1712 SubstTemplateTypeParmType *SubstParm 1713 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1714 1715 if (!SubstParm) { 1716 SubstParm = new (*this, TypeAlignment) 1717 SubstTemplateTypeParmType(Parm, Replacement); 1718 Types.push_back(SubstParm); 1719 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1720 } 1721 1722 return QualType(SubstParm, 0); 1723} 1724 1725/// \brief Retrieve the template type parameter type for a template 1726/// parameter or parameter pack with the given depth, index, and (optionally) 1727/// name. 1728QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1729 bool ParameterPack, 1730 IdentifierInfo *Name) { 1731 llvm::FoldingSetNodeID ID; 1732 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1733 void *InsertPos = 0; 1734 TemplateTypeParmType *TypeParm 1735 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1736 1737 if (TypeParm) 1738 return QualType(TypeParm, 0); 1739 1740 if (Name) { 1741 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1742 TypeParm = new (*this, TypeAlignment) 1743 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1744 } else 1745 TypeParm = new (*this, TypeAlignment) 1746 TemplateTypeParmType(Depth, Index, ParameterPack); 1747 1748 Types.push_back(TypeParm); 1749 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1750 1751 return QualType(TypeParm, 0); 1752} 1753 1754QualType 1755ASTContext::getTemplateSpecializationType(TemplateName Template, 1756 const TemplateArgument *Args, 1757 unsigned NumArgs, 1758 QualType Canon) { 1759 if (!Canon.isNull()) 1760 Canon = getCanonicalType(Canon); 1761 else { 1762 // Build the canonical template specialization type. 1763 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1764 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1765 CanonArgs.reserve(NumArgs); 1766 for (unsigned I = 0; I != NumArgs; ++I) 1767 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1768 1769 // Determine whether this canonical template specialization type already 1770 // exists. 1771 llvm::FoldingSetNodeID ID; 1772 TemplateSpecializationType::Profile(ID, CanonTemplate, 1773 CanonArgs.data(), NumArgs, *this); 1774 1775 void *InsertPos = 0; 1776 TemplateSpecializationType *Spec 1777 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1778 1779 if (!Spec) { 1780 // Allocate a new canonical template specialization type. 1781 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1782 sizeof(TemplateArgument) * NumArgs), 1783 TypeAlignment); 1784 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1785 CanonArgs.data(), NumArgs, 1786 Canon); 1787 Types.push_back(Spec); 1788 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1789 } 1790 1791 if (Canon.isNull()) 1792 Canon = QualType(Spec, 0); 1793 assert(Canon->isDependentType() && 1794 "Non-dependent template-id type must have a canonical type"); 1795 } 1796 1797 // Allocate the (non-canonical) template specialization type, but don't 1798 // try to unique it: these types typically have location information that 1799 // we don't unique and don't want to lose. 1800 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1801 sizeof(TemplateArgument) * NumArgs), 1802 TypeAlignment); 1803 TemplateSpecializationType *Spec 1804 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1805 Canon); 1806 1807 Types.push_back(Spec); 1808 return QualType(Spec, 0); 1809} 1810 1811QualType 1812ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1813 QualType NamedType) { 1814 llvm::FoldingSetNodeID ID; 1815 QualifiedNameType::Profile(ID, NNS, NamedType); 1816 1817 void *InsertPos = 0; 1818 QualifiedNameType *T 1819 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1820 if (T) 1821 return QualType(T, 0); 1822 1823 T = new (*this) QualifiedNameType(NNS, NamedType, 1824 getCanonicalType(NamedType)); 1825 Types.push_back(T); 1826 QualifiedNameTypes.InsertNode(T, InsertPos); 1827 return QualType(T, 0); 1828} 1829 1830QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1831 const IdentifierInfo *Name, 1832 QualType Canon) { 1833 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1834 1835 if (Canon.isNull()) { 1836 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1837 if (CanonNNS != NNS) 1838 Canon = getTypenameType(CanonNNS, Name); 1839 } 1840 1841 llvm::FoldingSetNodeID ID; 1842 TypenameType::Profile(ID, NNS, Name); 1843 1844 void *InsertPos = 0; 1845 TypenameType *T 1846 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1847 if (T) 1848 return QualType(T, 0); 1849 1850 T = new (*this) TypenameType(NNS, Name, Canon); 1851 Types.push_back(T); 1852 TypenameTypes.InsertNode(T, InsertPos); 1853 return QualType(T, 0); 1854} 1855 1856QualType 1857ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1858 const TemplateSpecializationType *TemplateId, 1859 QualType Canon) { 1860 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1861 1862 if (Canon.isNull()) { 1863 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1864 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1865 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1866 const TemplateSpecializationType *CanonTemplateId 1867 = CanonType->getAs<TemplateSpecializationType>(); 1868 assert(CanonTemplateId && 1869 "Canonical type must also be a template specialization type"); 1870 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1871 } 1872 } 1873 1874 llvm::FoldingSetNodeID ID; 1875 TypenameType::Profile(ID, NNS, TemplateId); 1876 1877 void *InsertPos = 0; 1878 TypenameType *T 1879 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1880 if (T) 1881 return QualType(T, 0); 1882 1883 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1884 Types.push_back(T); 1885 TypenameTypes.InsertNode(T, InsertPos); 1886 return QualType(T, 0); 1887} 1888 1889QualType 1890ASTContext::getElaboratedType(QualType UnderlyingType, 1891 ElaboratedType::TagKind Tag) { 1892 llvm::FoldingSetNodeID ID; 1893 ElaboratedType::Profile(ID, UnderlyingType, Tag); 1894 1895 void *InsertPos = 0; 1896 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 1897 if (T) 1898 return QualType(T, 0); 1899 1900 QualType Canon = getCanonicalType(UnderlyingType); 1901 1902 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 1903 Types.push_back(T); 1904 ElaboratedTypes.InsertNode(T, InsertPos); 1905 return QualType(T, 0); 1906} 1907 1908/// CmpProtocolNames - Comparison predicate for sorting protocols 1909/// alphabetically. 1910static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1911 const ObjCProtocolDecl *RHS) { 1912 return LHS->getDeclName() < RHS->getDeclName(); 1913} 1914 1915static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1916 unsigned &NumProtocols) { 1917 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1918 1919 // Sort protocols, keyed by name. 1920 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1921 1922 // Remove duplicates. 1923 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1924 NumProtocols = ProtocolsEnd-Protocols; 1925} 1926 1927/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1928/// the given interface decl and the conforming protocol list. 1929QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1930 ObjCProtocolDecl **Protocols, 1931 unsigned NumProtocols) { 1932 // Sort the protocol list alphabetically to canonicalize it. 1933 if (NumProtocols) 1934 SortAndUniqueProtocols(Protocols, NumProtocols); 1935 1936 llvm::FoldingSetNodeID ID; 1937 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1938 1939 void *InsertPos = 0; 1940 if (ObjCObjectPointerType *QT = 1941 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1942 return QualType(QT, 0); 1943 1944 // No Match; 1945 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 1946 ObjCObjectPointerType(InterfaceT, Protocols, NumProtocols); 1947 1948 Types.push_back(QType); 1949 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1950 return QualType(QType, 0); 1951} 1952 1953/// getObjCInterfaceType - Return the unique reference to the type for the 1954/// specified ObjC interface decl. The list of protocols is optional. 1955QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1956 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1957 if (NumProtocols) 1958 // Sort the protocol list alphabetically to canonicalize it. 1959 SortAndUniqueProtocols(Protocols, NumProtocols); 1960 1961 llvm::FoldingSetNodeID ID; 1962 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1963 1964 void *InsertPos = 0; 1965 if (ObjCInterfaceType *QT = 1966 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1967 return QualType(QT, 0); 1968 1969 // No Match; 1970 ObjCInterfaceType *QType = new (*this, TypeAlignment) 1971 ObjCInterfaceType(const_cast<ObjCInterfaceDecl*>(Decl), 1972 Protocols, NumProtocols); 1973 Types.push_back(QType); 1974 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 1975 return QualType(QType, 0); 1976} 1977 1978QualType ASTContext::getObjCProtocolListType(QualType T, 1979 ObjCProtocolDecl **Protocols, 1980 unsigned NumProtocols) { 1981 llvm::FoldingSetNodeID ID; 1982 ObjCProtocolListType::Profile(ID, T, Protocols, NumProtocols); 1983 1984 void *InsertPos = 0; 1985 if (ObjCProtocolListType *QT = 1986 ObjCProtocolListTypes.FindNodeOrInsertPos(ID, InsertPos)) 1987 return QualType(QT, 0); 1988 1989 // No Match; 1990 ObjCProtocolListType *QType = new (*this, TypeAlignment) 1991 ObjCProtocolListType(T, Protocols, NumProtocols); 1992 Types.push_back(QType); 1993 ObjCProtocolListTypes.InsertNode(QType, InsertPos); 1994 return QualType(QType, 0); 1995} 1996 1997/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1998/// TypeOfExprType AST's (since expression's are never shared). For example, 1999/// multiple declarations that refer to "typeof(x)" all contain different 2000/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2001/// on canonical type's (which are always unique). 2002QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2003 TypeOfExprType *toe; 2004 if (tofExpr->isTypeDependent()) { 2005 llvm::FoldingSetNodeID ID; 2006 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2007 2008 void *InsertPos = 0; 2009 DependentTypeOfExprType *Canon 2010 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2011 if (Canon) { 2012 // We already have a "canonical" version of an identical, dependent 2013 // typeof(expr) type. Use that as our canonical type. 2014 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2015 QualType((TypeOfExprType*)Canon, 0)); 2016 } 2017 else { 2018 // Build a new, canonical typeof(expr) type. 2019 Canon 2020 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2021 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2022 toe = Canon; 2023 } 2024 } else { 2025 QualType Canonical = getCanonicalType(tofExpr->getType()); 2026 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2027 } 2028 Types.push_back(toe); 2029 return QualType(toe, 0); 2030} 2031 2032/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2033/// TypeOfType AST's. The only motivation to unique these nodes would be 2034/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2035/// an issue. This doesn't effect the type checker, since it operates 2036/// on canonical type's (which are always unique). 2037QualType ASTContext::getTypeOfType(QualType tofType) { 2038 QualType Canonical = getCanonicalType(tofType); 2039 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2040 Types.push_back(tot); 2041 return QualType(tot, 0); 2042} 2043 2044/// getDecltypeForExpr - Given an expr, will return the decltype for that 2045/// expression, according to the rules in C++0x [dcl.type.simple]p4 2046static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2047 if (e->isTypeDependent()) 2048 return Context.DependentTy; 2049 2050 // If e is an id expression or a class member access, decltype(e) is defined 2051 // as the type of the entity named by e. 2052 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2053 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2054 return VD->getType(); 2055 } 2056 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2057 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2058 return FD->getType(); 2059 } 2060 // If e is a function call or an invocation of an overloaded operator, 2061 // (parentheses around e are ignored), decltype(e) is defined as the 2062 // return type of that function. 2063 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2064 return CE->getCallReturnType(); 2065 2066 QualType T = e->getType(); 2067 2068 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2069 // defined as T&, otherwise decltype(e) is defined as T. 2070 if (e->isLvalue(Context) == Expr::LV_Valid) 2071 T = Context.getLValueReferenceType(T); 2072 2073 return T; 2074} 2075 2076/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2077/// DecltypeType AST's. The only motivation to unique these nodes would be 2078/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2079/// an issue. This doesn't effect the type checker, since it operates 2080/// on canonical type's (which are always unique). 2081QualType ASTContext::getDecltypeType(Expr *e) { 2082 DecltypeType *dt; 2083 if (e->isTypeDependent()) { 2084 llvm::FoldingSetNodeID ID; 2085 DependentDecltypeType::Profile(ID, *this, e); 2086 2087 void *InsertPos = 0; 2088 DependentDecltypeType *Canon 2089 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2090 if (Canon) { 2091 // We already have a "canonical" version of an equivalent, dependent 2092 // decltype type. Use that as our canonical type. 2093 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2094 QualType((DecltypeType*)Canon, 0)); 2095 } 2096 else { 2097 // Build a new, canonical typeof(expr) type. 2098 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2099 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2100 dt = Canon; 2101 } 2102 } else { 2103 QualType T = getDecltypeForExpr(e, *this); 2104 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2105 } 2106 Types.push_back(dt); 2107 return QualType(dt, 0); 2108} 2109 2110/// getTagDeclType - Return the unique reference to the type for the 2111/// specified TagDecl (struct/union/class/enum) decl. 2112QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2113 assert (Decl); 2114 // FIXME: What is the design on getTagDeclType when it requires casting 2115 // away const? mutable? 2116 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2117} 2118 2119/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2120/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2121/// needs to agree with the definition in <stddef.h>. 2122QualType ASTContext::getSizeType() const { 2123 return getFromTargetType(Target.getSizeType()); 2124} 2125 2126/// getSignedWCharType - Return the type of "signed wchar_t". 2127/// Used when in C++, as a GCC extension. 2128QualType ASTContext::getSignedWCharType() const { 2129 // FIXME: derive from "Target" ? 2130 return WCharTy; 2131} 2132 2133/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2134/// Used when in C++, as a GCC extension. 2135QualType ASTContext::getUnsignedWCharType() const { 2136 // FIXME: derive from "Target" ? 2137 return UnsignedIntTy; 2138} 2139 2140/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2141/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2142QualType ASTContext::getPointerDiffType() const { 2143 return getFromTargetType(Target.getPtrDiffType(0)); 2144} 2145 2146//===----------------------------------------------------------------------===// 2147// Type Operators 2148//===----------------------------------------------------------------------===// 2149 2150/// getCanonicalType - Return the canonical (structural) type corresponding to 2151/// the specified potentially non-canonical type. The non-canonical version 2152/// of a type may have many "decorated" versions of types. Decorators can 2153/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2154/// to be free of any of these, allowing two canonical types to be compared 2155/// for exact equality with a simple pointer comparison. 2156CanQualType ASTContext::getCanonicalType(QualType T) { 2157 QualifierCollector Quals; 2158 const Type *Ptr = Quals.strip(T); 2159 QualType CanType = Ptr->getCanonicalTypeInternal(); 2160 2161 // The canonical internal type will be the canonical type *except* 2162 // that we push type qualifiers down through array types. 2163 2164 // If there are no new qualifiers to push down, stop here. 2165 if (!Quals.hasQualifiers()) 2166 return CanQualType::CreateUnsafe(CanType); 2167 2168 // If the type qualifiers are on an array type, get the canonical 2169 // type of the array with the qualifiers applied to the element 2170 // type. 2171 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2172 if (!AT) 2173 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2174 2175 // Get the canonical version of the element with the extra qualifiers on it. 2176 // This can recursively sink qualifiers through multiple levels of arrays. 2177 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2178 NewEltTy = getCanonicalType(NewEltTy); 2179 2180 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2181 return CanQualType::CreateUnsafe( 2182 getConstantArrayType(NewEltTy, CAT->getSize(), 2183 CAT->getSizeModifier(), 2184 CAT->getIndexTypeCVRQualifiers())); 2185 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2186 return CanQualType::CreateUnsafe( 2187 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2188 IAT->getIndexTypeCVRQualifiers())); 2189 2190 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2191 return CanQualType::CreateUnsafe( 2192 getDependentSizedArrayType(NewEltTy, 2193 DSAT->getSizeExpr() ? 2194 DSAT->getSizeExpr()->Retain() : 0, 2195 DSAT->getSizeModifier(), 2196 DSAT->getIndexTypeCVRQualifiers(), 2197 DSAT->getBracketsRange())); 2198 2199 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2200 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2201 VAT->getSizeExpr() ? 2202 VAT->getSizeExpr()->Retain() : 0, 2203 VAT->getSizeModifier(), 2204 VAT->getIndexTypeCVRQualifiers(), 2205 VAT->getBracketsRange())); 2206} 2207 2208TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2209 // If this template name refers to a template, the canonical 2210 // template name merely stores the template itself. 2211 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2212 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2213 2214 // If this template name refers to a set of overloaded function templates, 2215 /// the canonical template name merely stores the set of function templates. 2216 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) { 2217 OverloadedFunctionDecl *CanonOvl = 0; 2218 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 2219 FEnd = Ovl->function_end(); 2220 F != FEnd; ++F) { 2221 Decl *Canon = F->get()->getCanonicalDecl(); 2222 if (CanonOvl || Canon != F->get()) { 2223 if (!CanonOvl) 2224 CanonOvl = OverloadedFunctionDecl::Create(*this, 2225 Ovl->getDeclContext(), 2226 Ovl->getDeclName()); 2227 2228 CanonOvl->addOverload( 2229 AnyFunctionDecl::getFromNamedDecl(cast<NamedDecl>(Canon))); 2230 } 2231 } 2232 2233 return TemplateName(CanonOvl? CanonOvl : Ovl); 2234 } 2235 2236 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2237 assert(DTN && "Non-dependent template names must refer to template decls."); 2238 return DTN->CanonicalTemplateName; 2239} 2240 2241TemplateArgument 2242ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2243 switch (Arg.getKind()) { 2244 case TemplateArgument::Null: 2245 return Arg; 2246 2247 case TemplateArgument::Expression: 2248 // FIXME: Build canonical expression? 2249 return Arg; 2250 2251 case TemplateArgument::Declaration: 2252 return TemplateArgument(SourceLocation(), 2253 Arg.getAsDecl()->getCanonicalDecl()); 2254 2255 case TemplateArgument::Integral: 2256 return TemplateArgument(SourceLocation(), 2257 *Arg.getAsIntegral(), 2258 getCanonicalType(Arg.getIntegralType())); 2259 2260 case TemplateArgument::Type: 2261 return TemplateArgument(SourceLocation(), 2262 getCanonicalType(Arg.getAsType())); 2263 2264 case TemplateArgument::Pack: { 2265 // FIXME: Allocate in ASTContext 2266 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2267 unsigned Idx = 0; 2268 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2269 AEnd = Arg.pack_end(); 2270 A != AEnd; (void)++A, ++Idx) 2271 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2272 2273 TemplateArgument Result; 2274 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2275 return Result; 2276 } 2277 } 2278 2279 // Silence GCC warning 2280 assert(false && "Unhandled template argument kind"); 2281 return TemplateArgument(); 2282} 2283 2284NestedNameSpecifier * 2285ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2286 if (!NNS) 2287 return 0; 2288 2289 switch (NNS->getKind()) { 2290 case NestedNameSpecifier::Identifier: 2291 // Canonicalize the prefix but keep the identifier the same. 2292 return NestedNameSpecifier::Create(*this, 2293 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2294 NNS->getAsIdentifier()); 2295 2296 case NestedNameSpecifier::Namespace: 2297 // A namespace is canonical; build a nested-name-specifier with 2298 // this namespace and no prefix. 2299 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2300 2301 case NestedNameSpecifier::TypeSpec: 2302 case NestedNameSpecifier::TypeSpecWithTemplate: { 2303 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2304 return NestedNameSpecifier::Create(*this, 0, 2305 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2306 T.getTypePtr()); 2307 } 2308 2309 case NestedNameSpecifier::Global: 2310 // The global specifier is canonical and unique. 2311 return NNS; 2312 } 2313 2314 // Required to silence a GCC warning 2315 return 0; 2316} 2317 2318 2319const ArrayType *ASTContext::getAsArrayType(QualType T) { 2320 // Handle the non-qualified case efficiently. 2321 if (!T.hasQualifiers()) { 2322 // Handle the common positive case fast. 2323 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2324 return AT; 2325 } 2326 2327 // Handle the common negative case fast. 2328 QualType CType = T->getCanonicalTypeInternal(); 2329 if (!isa<ArrayType>(CType)) 2330 return 0; 2331 2332 // Apply any qualifiers from the array type to the element type. This 2333 // implements C99 6.7.3p8: "If the specification of an array type includes 2334 // any type qualifiers, the element type is so qualified, not the array type." 2335 2336 // If we get here, we either have type qualifiers on the type, or we have 2337 // sugar such as a typedef in the way. If we have type qualifiers on the type 2338 // we must propagate them down into the element type. 2339 2340 QualifierCollector Qs; 2341 const Type *Ty = Qs.strip(T.getDesugaredType()); 2342 2343 // If we have a simple case, just return now. 2344 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2345 if (ATy == 0 || Qs.empty()) 2346 return ATy; 2347 2348 // Otherwise, we have an array and we have qualifiers on it. Push the 2349 // qualifiers into the array element type and return a new array type. 2350 // Get the canonical version of the element with the extra qualifiers on it. 2351 // This can recursively sink qualifiers through multiple levels of arrays. 2352 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2353 2354 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2355 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2356 CAT->getSizeModifier(), 2357 CAT->getIndexTypeCVRQualifiers())); 2358 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2359 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2360 IAT->getSizeModifier(), 2361 IAT->getIndexTypeCVRQualifiers())); 2362 2363 if (const DependentSizedArrayType *DSAT 2364 = dyn_cast<DependentSizedArrayType>(ATy)) 2365 return cast<ArrayType>( 2366 getDependentSizedArrayType(NewEltTy, 2367 DSAT->getSizeExpr() ? 2368 DSAT->getSizeExpr()->Retain() : 0, 2369 DSAT->getSizeModifier(), 2370 DSAT->getIndexTypeCVRQualifiers(), 2371 DSAT->getBracketsRange())); 2372 2373 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2374 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2375 VAT->getSizeExpr() ? 2376 VAT->getSizeExpr()->Retain() : 0, 2377 VAT->getSizeModifier(), 2378 VAT->getIndexTypeCVRQualifiers(), 2379 VAT->getBracketsRange())); 2380} 2381 2382 2383/// getArrayDecayedType - Return the properly qualified result of decaying the 2384/// specified array type to a pointer. This operation is non-trivial when 2385/// handling typedefs etc. The canonical type of "T" must be an array type, 2386/// this returns a pointer to a properly qualified element of the array. 2387/// 2388/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2389QualType ASTContext::getArrayDecayedType(QualType Ty) { 2390 // Get the element type with 'getAsArrayType' so that we don't lose any 2391 // typedefs in the element type of the array. This also handles propagation 2392 // of type qualifiers from the array type into the element type if present 2393 // (C99 6.7.3p8). 2394 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2395 assert(PrettyArrayType && "Not an array type!"); 2396 2397 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2398 2399 // int x[restrict 4] -> int *restrict 2400 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2401} 2402 2403QualType ASTContext::getBaseElementType(QualType QT) { 2404 QualifierCollector Qs; 2405 while (true) { 2406 const Type *UT = Qs.strip(QT); 2407 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2408 QT = AT->getElementType(); 2409 } else { 2410 return Qs.apply(QT); 2411 } 2412 } 2413} 2414 2415QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2416 QualType ElemTy = AT->getElementType(); 2417 2418 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2419 return getBaseElementType(AT); 2420 2421 return ElemTy; 2422} 2423 2424/// getConstantArrayElementCount - Returns number of constant array elements. 2425uint64_t 2426ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2427 uint64_t ElementCount = 1; 2428 do { 2429 ElementCount *= CA->getSize().getZExtValue(); 2430 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2431 } while (CA); 2432 return ElementCount; 2433} 2434 2435/// getFloatingRank - Return a relative rank for floating point types. 2436/// This routine will assert if passed a built-in type that isn't a float. 2437static FloatingRank getFloatingRank(QualType T) { 2438 if (const ComplexType *CT = T->getAs<ComplexType>()) 2439 return getFloatingRank(CT->getElementType()); 2440 2441 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2442 switch (T->getAs<BuiltinType>()->getKind()) { 2443 default: assert(0 && "getFloatingRank(): not a floating type"); 2444 case BuiltinType::Float: return FloatRank; 2445 case BuiltinType::Double: return DoubleRank; 2446 case BuiltinType::LongDouble: return LongDoubleRank; 2447 } 2448} 2449 2450/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2451/// point or a complex type (based on typeDomain/typeSize). 2452/// 'typeDomain' is a real floating point or complex type. 2453/// 'typeSize' is a real floating point or complex type. 2454QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2455 QualType Domain) const { 2456 FloatingRank EltRank = getFloatingRank(Size); 2457 if (Domain->isComplexType()) { 2458 switch (EltRank) { 2459 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2460 case FloatRank: return FloatComplexTy; 2461 case DoubleRank: return DoubleComplexTy; 2462 case LongDoubleRank: return LongDoubleComplexTy; 2463 } 2464 } 2465 2466 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2467 switch (EltRank) { 2468 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2469 case FloatRank: return FloatTy; 2470 case DoubleRank: return DoubleTy; 2471 case LongDoubleRank: return LongDoubleTy; 2472 } 2473} 2474 2475/// getFloatingTypeOrder - Compare the rank of the two specified floating 2476/// point types, ignoring the domain of the type (i.e. 'double' == 2477/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2478/// LHS < RHS, return -1. 2479int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2480 FloatingRank LHSR = getFloatingRank(LHS); 2481 FloatingRank RHSR = getFloatingRank(RHS); 2482 2483 if (LHSR == RHSR) 2484 return 0; 2485 if (LHSR > RHSR) 2486 return 1; 2487 return -1; 2488} 2489 2490/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2491/// routine will assert if passed a built-in type that isn't an integer or enum, 2492/// or if it is not canonicalized. 2493unsigned ASTContext::getIntegerRank(Type *T) { 2494 assert(T->isCanonical() && "T should be canonicalized"); 2495 if (EnumType* ET = dyn_cast<EnumType>(T)) 2496 T = ET->getDecl()->getIntegerType().getTypePtr(); 2497 2498 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2499 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2500 2501 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2502 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2503 2504 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2505 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2506 2507 // There are two things which impact the integer rank: the width, and 2508 // the ordering of builtins. The builtin ordering is encoded in the 2509 // bottom three bits; the width is encoded in the bits above that. 2510 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2511 return FWIT->getWidth() << 3; 2512 2513 switch (cast<BuiltinType>(T)->getKind()) { 2514 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2515 case BuiltinType::Bool: 2516 return 1 + (getIntWidth(BoolTy) << 3); 2517 case BuiltinType::Char_S: 2518 case BuiltinType::Char_U: 2519 case BuiltinType::SChar: 2520 case BuiltinType::UChar: 2521 return 2 + (getIntWidth(CharTy) << 3); 2522 case BuiltinType::Short: 2523 case BuiltinType::UShort: 2524 return 3 + (getIntWidth(ShortTy) << 3); 2525 case BuiltinType::Int: 2526 case BuiltinType::UInt: 2527 return 4 + (getIntWidth(IntTy) << 3); 2528 case BuiltinType::Long: 2529 case BuiltinType::ULong: 2530 return 5 + (getIntWidth(LongTy) << 3); 2531 case BuiltinType::LongLong: 2532 case BuiltinType::ULongLong: 2533 return 6 + (getIntWidth(LongLongTy) << 3); 2534 case BuiltinType::Int128: 2535 case BuiltinType::UInt128: 2536 return 7 + (getIntWidth(Int128Ty) << 3); 2537 } 2538} 2539 2540/// \brief Whether this is a promotable bitfield reference according 2541/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2542/// 2543/// \returns the type this bit-field will promote to, or NULL if no 2544/// promotion occurs. 2545QualType ASTContext::isPromotableBitField(Expr *E) { 2546 FieldDecl *Field = E->getBitField(); 2547 if (!Field) 2548 return QualType(); 2549 2550 QualType FT = Field->getType(); 2551 2552 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2553 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2554 uint64_t IntSize = getTypeSize(IntTy); 2555 // GCC extension compatibility: if the bit-field size is less than or equal 2556 // to the size of int, it gets promoted no matter what its type is. 2557 // For instance, unsigned long bf : 4 gets promoted to signed int. 2558 if (BitWidth < IntSize) 2559 return IntTy; 2560 2561 if (BitWidth == IntSize) 2562 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2563 2564 // Types bigger than int are not subject to promotions, and therefore act 2565 // like the base type. 2566 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2567 // is ridiculous. 2568 return QualType(); 2569} 2570 2571/// getPromotedIntegerType - Returns the type that Promotable will 2572/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2573/// integer type. 2574QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2575 assert(!Promotable.isNull()); 2576 assert(Promotable->isPromotableIntegerType()); 2577 if (Promotable->isSignedIntegerType()) 2578 return IntTy; 2579 uint64_t PromotableSize = getTypeSize(Promotable); 2580 uint64_t IntSize = getTypeSize(IntTy); 2581 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2582 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2583} 2584 2585/// getIntegerTypeOrder - Returns the highest ranked integer type: 2586/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2587/// LHS < RHS, return -1. 2588int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2589 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2590 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2591 if (LHSC == RHSC) return 0; 2592 2593 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2594 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2595 2596 unsigned LHSRank = getIntegerRank(LHSC); 2597 unsigned RHSRank = getIntegerRank(RHSC); 2598 2599 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2600 if (LHSRank == RHSRank) return 0; 2601 return LHSRank > RHSRank ? 1 : -1; 2602 } 2603 2604 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2605 if (LHSUnsigned) { 2606 // If the unsigned [LHS] type is larger, return it. 2607 if (LHSRank >= RHSRank) 2608 return 1; 2609 2610 // If the signed type can represent all values of the unsigned type, it 2611 // wins. Because we are dealing with 2's complement and types that are 2612 // powers of two larger than each other, this is always safe. 2613 return -1; 2614 } 2615 2616 // If the unsigned [RHS] type is larger, return it. 2617 if (RHSRank >= LHSRank) 2618 return -1; 2619 2620 // If the signed type can represent all values of the unsigned type, it 2621 // wins. Because we are dealing with 2's complement and types that are 2622 // powers of two larger than each other, this is always safe. 2623 return 1; 2624} 2625 2626// getCFConstantStringType - Return the type used for constant CFStrings. 2627QualType ASTContext::getCFConstantStringType() { 2628 if (!CFConstantStringTypeDecl) { 2629 CFConstantStringTypeDecl = 2630 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2631 &Idents.get("NSConstantString")); 2632 QualType FieldTypes[4]; 2633 2634 // const int *isa; 2635 FieldTypes[0] = getPointerType(IntTy.withConst()); 2636 // int flags; 2637 FieldTypes[1] = IntTy; 2638 // const char *str; 2639 FieldTypes[2] = getPointerType(CharTy.withConst()); 2640 // long length; 2641 FieldTypes[3] = LongTy; 2642 2643 // Create fields 2644 for (unsigned i = 0; i < 4; ++i) { 2645 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2646 SourceLocation(), 0, 2647 FieldTypes[i], /*DInfo=*/0, 2648 /*BitWidth=*/0, 2649 /*Mutable=*/false); 2650 CFConstantStringTypeDecl->addDecl(Field); 2651 } 2652 2653 CFConstantStringTypeDecl->completeDefinition(*this); 2654 } 2655 2656 return getTagDeclType(CFConstantStringTypeDecl); 2657} 2658 2659void ASTContext::setCFConstantStringType(QualType T) { 2660 const RecordType *Rec = T->getAs<RecordType>(); 2661 assert(Rec && "Invalid CFConstantStringType"); 2662 CFConstantStringTypeDecl = Rec->getDecl(); 2663} 2664 2665QualType ASTContext::getObjCFastEnumerationStateType() { 2666 if (!ObjCFastEnumerationStateTypeDecl) { 2667 ObjCFastEnumerationStateTypeDecl = 2668 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2669 &Idents.get("__objcFastEnumerationState")); 2670 2671 QualType FieldTypes[] = { 2672 UnsignedLongTy, 2673 getPointerType(ObjCIdTypedefType), 2674 getPointerType(UnsignedLongTy), 2675 getConstantArrayType(UnsignedLongTy, 2676 llvm::APInt(32, 5), ArrayType::Normal, 0) 2677 }; 2678 2679 for (size_t i = 0; i < 4; ++i) { 2680 FieldDecl *Field = FieldDecl::Create(*this, 2681 ObjCFastEnumerationStateTypeDecl, 2682 SourceLocation(), 0, 2683 FieldTypes[i], /*DInfo=*/0, 2684 /*BitWidth=*/0, 2685 /*Mutable=*/false); 2686 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2687 } 2688 2689 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2690 } 2691 2692 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2693} 2694 2695QualType ASTContext::getBlockDescriptorType() { 2696 if (BlockDescriptorType) 2697 return getTagDeclType(BlockDescriptorType); 2698 2699 RecordDecl *T; 2700 // FIXME: Needs the FlagAppleBlock bit. 2701 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2702 &Idents.get("__block_descriptor")); 2703 2704 QualType FieldTypes[] = { 2705 UnsignedLongTy, 2706 UnsignedLongTy, 2707 }; 2708 2709 const char *FieldNames[] = { 2710 "reserved", 2711 "Size", 2712 }; 2713 2714 for (size_t i = 0; i < 2; ++i) { 2715 FieldDecl *Field = FieldDecl::Create(*this, 2716 T, 2717 SourceLocation(), 2718 &Idents.get(FieldNames[i]), 2719 FieldTypes[i], /*DInfo=*/0, 2720 /*BitWidth=*/0, 2721 /*Mutable=*/false); 2722 T->addDecl(Field); 2723 } 2724 2725 T->completeDefinition(*this); 2726 2727 BlockDescriptorType = T; 2728 2729 return getTagDeclType(BlockDescriptorType); 2730} 2731 2732void ASTContext::setBlockDescriptorType(QualType T) { 2733 const RecordType *Rec = T->getAs<RecordType>(); 2734 assert(Rec && "Invalid BlockDescriptorType"); 2735 BlockDescriptorType = Rec->getDecl(); 2736} 2737 2738QualType ASTContext::getBlockParmType() { 2739 // FIXME: Move up 2740 static int UniqueBlockParmTypeID = 0; 2741 char Name[36]; 2742 sprintf(Name, "__block_literal_%u", ++UniqueBlockParmTypeID); 2743 RecordDecl *T; 2744 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2745 &Idents.get(Name)); 2746 2747#define REV2 2748#ifdef REV2 2749 cast<TagDecl>(T)->startDefinition(); 2750#endif 2751 2752 return getPointerType(getTagDeclType(T)); 2753} 2754 2755void ASTContext::completeBlockParmType(QualType Ty, 2756 llvm::SmallVector<const Expr *, 8> &BlockDeclRefDecls) { 2757 RecordDecl *PT = Ty->getPointeeType()->getAs<RecordType>()->getDecl(); 2758 llvm::StringRef Name = PT->getIdentifier()->getName(); 2759 2760 RecordDecl *T; 2761#ifdef REV2 2762 T = PT; 2763#else 2764 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2765 &Idents.get(Name), SourceLocation(), PT); 2766 2767 cast<TagDecl>(T)->startDefinition(); 2768#endif 2769 2770 QualType FieldTypes[] = { 2771 getPointerType(VoidPtrTy), 2772 IntTy, 2773 IntTy, 2774 getPointerType(VoidPtrTy), 2775 getPointerType(getBlockDescriptorType()), 2776 }; 2777 2778 const char *FieldNames[] = { 2779 "__isa", 2780 "__flags", 2781 "__reserved", 2782 "__FuncPtr", 2783 "__descriptor" 2784 }; 2785 2786 for (size_t i = 0; i < 5; ++i) { 2787 FieldDecl *Field = FieldDecl::Create(*this, 2788 T, 2789 SourceLocation(), 2790 &Idents.get(FieldNames[i]), 2791 FieldTypes[i], /*DInfo=*/0, 2792 /*BitWidth=*/0, 2793 /*Mutable=*/false); 2794 // FIXME: Do this instead or addDecl? 2795 // PushOnScopeChains(FieldTypes, S); 2796 T->addDecl(Field); 2797 } 2798 2799 T->completeDefinition(*this); 2800} 2801 2802void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2803 const RecordType *Rec = T->getAs<RecordType>(); 2804 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2805 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2806} 2807 2808// This returns true if a type has been typedefed to BOOL: 2809// typedef <type> BOOL; 2810static bool isTypeTypedefedAsBOOL(QualType T) { 2811 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2812 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2813 return II->isStr("BOOL"); 2814 2815 return false; 2816} 2817 2818/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2819/// purpose. 2820int ASTContext::getObjCEncodingTypeSize(QualType type) { 2821 uint64_t sz = getTypeSize(type); 2822 2823 // Make all integer and enum types at least as large as an int 2824 if (sz > 0 && type->isIntegralType()) 2825 sz = std::max(sz, getTypeSize(IntTy)); 2826 // Treat arrays as pointers, since that's how they're passed in. 2827 else if (type->isArrayType()) 2828 sz = getTypeSize(VoidPtrTy); 2829 return sz / getTypeSize(CharTy); 2830} 2831 2832/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2833/// declaration. 2834void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2835 std::string& S) { 2836 // FIXME: This is not very efficient. 2837 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2838 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2839 // Encode result type. 2840 getObjCEncodingForType(Decl->getResultType(), S); 2841 // Compute size of all parameters. 2842 // Start with computing size of a pointer in number of bytes. 2843 // FIXME: There might(should) be a better way of doing this computation! 2844 SourceLocation Loc; 2845 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2846 // The first two arguments (self and _cmd) are pointers; account for 2847 // their size. 2848 int ParmOffset = 2 * PtrSize; 2849 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2850 E = Decl->param_end(); PI != E; ++PI) { 2851 QualType PType = (*PI)->getType(); 2852 int sz = getObjCEncodingTypeSize(PType); 2853 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2854 ParmOffset += sz; 2855 } 2856 S += llvm::utostr(ParmOffset); 2857 S += "@0:"; 2858 S += llvm::utostr(PtrSize); 2859 2860 // Argument types. 2861 ParmOffset = 2 * PtrSize; 2862 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2863 E = Decl->param_end(); PI != E; ++PI) { 2864 ParmVarDecl *PVDecl = *PI; 2865 QualType PType = PVDecl->getOriginalType(); 2866 if (const ArrayType *AT = 2867 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2868 // Use array's original type only if it has known number of 2869 // elements. 2870 if (!isa<ConstantArrayType>(AT)) 2871 PType = PVDecl->getType(); 2872 } else if (PType->isFunctionType()) 2873 PType = PVDecl->getType(); 2874 // Process argument qualifiers for user supplied arguments; such as, 2875 // 'in', 'inout', etc. 2876 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2877 getObjCEncodingForType(PType, S); 2878 S += llvm::utostr(ParmOffset); 2879 ParmOffset += getObjCEncodingTypeSize(PType); 2880 } 2881} 2882 2883/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2884/// property declaration. If non-NULL, Container must be either an 2885/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2886/// NULL when getting encodings for protocol properties. 2887/// Property attributes are stored as a comma-delimited C string. The simple 2888/// attributes readonly and bycopy are encoded as single characters. The 2889/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2890/// encoded as single characters, followed by an identifier. Property types 2891/// are also encoded as a parametrized attribute. The characters used to encode 2892/// these attributes are defined by the following enumeration: 2893/// @code 2894/// enum PropertyAttributes { 2895/// kPropertyReadOnly = 'R', // property is read-only. 2896/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2897/// kPropertyByref = '&', // property is a reference to the value last assigned 2898/// kPropertyDynamic = 'D', // property is dynamic 2899/// kPropertyGetter = 'G', // followed by getter selector name 2900/// kPropertySetter = 'S', // followed by setter selector name 2901/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2902/// kPropertyType = 't' // followed by old-style type encoding. 2903/// kPropertyWeak = 'W' // 'weak' property 2904/// kPropertyStrong = 'P' // property GC'able 2905/// kPropertyNonAtomic = 'N' // property non-atomic 2906/// }; 2907/// @endcode 2908void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2909 const Decl *Container, 2910 std::string& S) { 2911 // Collect information from the property implementation decl(s). 2912 bool Dynamic = false; 2913 ObjCPropertyImplDecl *SynthesizePID = 0; 2914 2915 // FIXME: Duplicated code due to poor abstraction. 2916 if (Container) { 2917 if (const ObjCCategoryImplDecl *CID = 2918 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2919 for (ObjCCategoryImplDecl::propimpl_iterator 2920 i = CID->propimpl_begin(), e = CID->propimpl_end(); 2921 i != e; ++i) { 2922 ObjCPropertyImplDecl *PID = *i; 2923 if (PID->getPropertyDecl() == PD) { 2924 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2925 Dynamic = true; 2926 } else { 2927 SynthesizePID = PID; 2928 } 2929 } 2930 } 2931 } else { 2932 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2933 for (ObjCCategoryImplDecl::propimpl_iterator 2934 i = OID->propimpl_begin(), e = OID->propimpl_end(); 2935 i != e; ++i) { 2936 ObjCPropertyImplDecl *PID = *i; 2937 if (PID->getPropertyDecl() == PD) { 2938 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2939 Dynamic = true; 2940 } else { 2941 SynthesizePID = PID; 2942 } 2943 } 2944 } 2945 } 2946 } 2947 2948 // FIXME: This is not very efficient. 2949 S = "T"; 2950 2951 // Encode result type. 2952 // GCC has some special rules regarding encoding of properties which 2953 // closely resembles encoding of ivars. 2954 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2955 true /* outermost type */, 2956 true /* encoding for property */); 2957 2958 if (PD->isReadOnly()) { 2959 S += ",R"; 2960 } else { 2961 switch (PD->getSetterKind()) { 2962 case ObjCPropertyDecl::Assign: break; 2963 case ObjCPropertyDecl::Copy: S += ",C"; break; 2964 case ObjCPropertyDecl::Retain: S += ",&"; break; 2965 } 2966 } 2967 2968 // It really isn't clear at all what this means, since properties 2969 // are "dynamic by default". 2970 if (Dynamic) 2971 S += ",D"; 2972 2973 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2974 S += ",N"; 2975 2976 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2977 S += ",G"; 2978 S += PD->getGetterName().getAsString(); 2979 } 2980 2981 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2982 S += ",S"; 2983 S += PD->getSetterName().getAsString(); 2984 } 2985 2986 if (SynthesizePID) { 2987 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2988 S += ",V"; 2989 S += OID->getNameAsString(); 2990 } 2991 2992 // FIXME: OBJCGC: weak & strong 2993} 2994 2995/// getLegacyIntegralTypeEncoding - 2996/// Another legacy compatibility encoding: 32-bit longs are encoded as 2997/// 'l' or 'L' , but not always. For typedefs, we need to use 2998/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2999/// 3000void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3001 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3002 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3003 if (BT->getKind() == BuiltinType::ULong && 3004 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3005 PointeeTy = UnsignedIntTy; 3006 else 3007 if (BT->getKind() == BuiltinType::Long && 3008 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3009 PointeeTy = IntTy; 3010 } 3011 } 3012} 3013 3014void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3015 const FieldDecl *Field) { 3016 // We follow the behavior of gcc, expanding structures which are 3017 // directly pointed to, and expanding embedded structures. Note that 3018 // these rules are sufficient to prevent recursive encoding of the 3019 // same type. 3020 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3021 true /* outermost type */); 3022} 3023 3024static void EncodeBitField(const ASTContext *Context, std::string& S, 3025 const FieldDecl *FD) { 3026 const Expr *E = FD->getBitWidth(); 3027 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3028 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3029 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3030 S += 'b'; 3031 S += llvm::utostr(N); 3032} 3033 3034// FIXME: Use SmallString for accumulating string. 3035void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3036 bool ExpandPointedToStructures, 3037 bool ExpandStructures, 3038 const FieldDecl *FD, 3039 bool OutermostType, 3040 bool EncodingProperty) { 3041 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3042 if (FD && FD->isBitField()) 3043 return EncodeBitField(this, S, FD); 3044 char encoding; 3045 switch (BT->getKind()) { 3046 default: assert(0 && "Unhandled builtin type kind"); 3047 case BuiltinType::Void: encoding = 'v'; break; 3048 case BuiltinType::Bool: encoding = 'B'; break; 3049 case BuiltinType::Char_U: 3050 case BuiltinType::UChar: encoding = 'C'; break; 3051 case BuiltinType::UShort: encoding = 'S'; break; 3052 case BuiltinType::UInt: encoding = 'I'; break; 3053 case BuiltinType::ULong: 3054 encoding = 3055 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3056 break; 3057 case BuiltinType::UInt128: encoding = 'T'; break; 3058 case BuiltinType::ULongLong: encoding = 'Q'; break; 3059 case BuiltinType::Char_S: 3060 case BuiltinType::SChar: encoding = 'c'; break; 3061 case BuiltinType::Short: encoding = 's'; break; 3062 case BuiltinType::Int: encoding = 'i'; break; 3063 case BuiltinType::Long: 3064 encoding = 3065 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3066 break; 3067 case BuiltinType::LongLong: encoding = 'q'; break; 3068 case BuiltinType::Int128: encoding = 't'; break; 3069 case BuiltinType::Float: encoding = 'f'; break; 3070 case BuiltinType::Double: encoding = 'd'; break; 3071 case BuiltinType::LongDouble: encoding = 'd'; break; 3072 } 3073 3074 S += encoding; 3075 return; 3076 } 3077 3078 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3079 S += 'j'; 3080 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3081 false); 3082 return; 3083 } 3084 3085 if (const PointerType *PT = T->getAs<PointerType>()) { 3086 QualType PointeeTy = PT->getPointeeType(); 3087 bool isReadOnly = false; 3088 // For historical/compatibility reasons, the read-only qualifier of the 3089 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3090 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3091 // Also, do not emit the 'r' for anything but the outermost type! 3092 if (isa<TypedefType>(T.getTypePtr())) { 3093 if (OutermostType && T.isConstQualified()) { 3094 isReadOnly = true; 3095 S += 'r'; 3096 } 3097 } else if (OutermostType) { 3098 QualType P = PointeeTy; 3099 while (P->getAs<PointerType>()) 3100 P = P->getAs<PointerType>()->getPointeeType(); 3101 if (P.isConstQualified()) { 3102 isReadOnly = true; 3103 S += 'r'; 3104 } 3105 } 3106 if (isReadOnly) { 3107 // Another legacy compatibility encoding. Some ObjC qualifier and type 3108 // combinations need to be rearranged. 3109 // Rewrite "in const" from "nr" to "rn" 3110 const char * s = S.c_str(); 3111 int len = S.length(); 3112 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3113 std::string replace = "rn"; 3114 S.replace(S.end()-2, S.end(), replace); 3115 } 3116 } 3117 if (isObjCSelType(PointeeTy)) { 3118 S += ':'; 3119 return; 3120 } 3121 3122 if (PointeeTy->isCharType()) { 3123 // char pointer types should be encoded as '*' unless it is a 3124 // type that has been typedef'd to 'BOOL'. 3125 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3126 S += '*'; 3127 return; 3128 } 3129 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3130 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3131 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3132 S += '#'; 3133 return; 3134 } 3135 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3136 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3137 S += '@'; 3138 return; 3139 } 3140 // fall through... 3141 } 3142 S += '^'; 3143 getLegacyIntegralTypeEncoding(PointeeTy); 3144 3145 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3146 NULL); 3147 return; 3148 } 3149 3150 if (const ArrayType *AT = 3151 // Ignore type qualifiers etc. 3152 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3153 if (isa<IncompleteArrayType>(AT)) { 3154 // Incomplete arrays are encoded as a pointer to the array element. 3155 S += '^'; 3156 3157 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3158 false, ExpandStructures, FD); 3159 } else { 3160 S += '['; 3161 3162 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3163 S += llvm::utostr(CAT->getSize().getZExtValue()); 3164 else { 3165 //Variable length arrays are encoded as a regular array with 0 elements. 3166 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3167 S += '0'; 3168 } 3169 3170 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3171 false, ExpandStructures, FD); 3172 S += ']'; 3173 } 3174 return; 3175 } 3176 3177 if (T->getAs<FunctionType>()) { 3178 S += '?'; 3179 return; 3180 } 3181 3182 if (const RecordType *RTy = T->getAs<RecordType>()) { 3183 RecordDecl *RDecl = RTy->getDecl(); 3184 S += RDecl->isUnion() ? '(' : '{'; 3185 // Anonymous structures print as '?' 3186 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3187 S += II->getName(); 3188 } else { 3189 S += '?'; 3190 } 3191 if (ExpandStructures) { 3192 S += '='; 3193 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3194 FieldEnd = RDecl->field_end(); 3195 Field != FieldEnd; ++Field) { 3196 if (FD) { 3197 S += '"'; 3198 S += Field->getNameAsString(); 3199 S += '"'; 3200 } 3201 3202 // Special case bit-fields. 3203 if (Field->isBitField()) { 3204 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3205 (*Field)); 3206 } else { 3207 QualType qt = Field->getType(); 3208 getLegacyIntegralTypeEncoding(qt); 3209 getObjCEncodingForTypeImpl(qt, S, false, true, 3210 FD); 3211 } 3212 } 3213 } 3214 S += RDecl->isUnion() ? ')' : '}'; 3215 return; 3216 } 3217 3218 if (T->isEnumeralType()) { 3219 if (FD && FD->isBitField()) 3220 EncodeBitField(this, S, FD); 3221 else 3222 S += 'i'; 3223 return; 3224 } 3225 3226 if (T->isBlockPointerType()) { 3227 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3228 return; 3229 } 3230 3231 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3232 // @encode(class_name) 3233 ObjCInterfaceDecl *OI = OIT->getDecl(); 3234 S += '{'; 3235 const IdentifierInfo *II = OI->getIdentifier(); 3236 S += II->getName(); 3237 S += '='; 3238 llvm::SmallVector<FieldDecl*, 32> RecFields; 3239 CollectObjCIvars(OI, RecFields); 3240 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3241 if (RecFields[i]->isBitField()) 3242 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3243 RecFields[i]); 3244 else 3245 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3246 FD); 3247 } 3248 S += '}'; 3249 return; 3250 } 3251 3252 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3253 if (OPT->isObjCIdType()) { 3254 S += '@'; 3255 return; 3256 } 3257 3258 if (OPT->isObjCClassType()) { 3259 S += '#'; 3260 return; 3261 } 3262 3263 if (OPT->isObjCQualifiedIdType()) { 3264 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3265 ExpandPointedToStructures, 3266 ExpandStructures, FD); 3267 if (FD || EncodingProperty) { 3268 // Note that we do extended encoding of protocol qualifer list 3269 // Only when doing ivar or property encoding. 3270 S += '"'; 3271 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3272 E = OPT->qual_end(); I != E; ++I) { 3273 S += '<'; 3274 S += (*I)->getNameAsString(); 3275 S += '>'; 3276 } 3277 S += '"'; 3278 } 3279 return; 3280 } 3281 3282 QualType PointeeTy = OPT->getPointeeType(); 3283 if (!EncodingProperty && 3284 isa<TypedefType>(PointeeTy.getTypePtr())) { 3285 // Another historical/compatibility reason. 3286 // We encode the underlying type which comes out as 3287 // {...}; 3288 S += '^'; 3289 getObjCEncodingForTypeImpl(PointeeTy, S, 3290 false, ExpandPointedToStructures, 3291 NULL); 3292 return; 3293 } 3294 3295 S += '@'; 3296 if (FD || EncodingProperty) { 3297 S += '"'; 3298 S += OPT->getInterfaceDecl()->getNameAsCString(); 3299 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3300 E = OPT->qual_end(); I != E; ++I) { 3301 S += '<'; 3302 S += (*I)->getNameAsString(); 3303 S += '>'; 3304 } 3305 S += '"'; 3306 } 3307 return; 3308 } 3309 3310 assert(0 && "@encode for type not implemented!"); 3311} 3312 3313void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3314 std::string& S) const { 3315 if (QT & Decl::OBJC_TQ_In) 3316 S += 'n'; 3317 if (QT & Decl::OBJC_TQ_Inout) 3318 S += 'N'; 3319 if (QT & Decl::OBJC_TQ_Out) 3320 S += 'o'; 3321 if (QT & Decl::OBJC_TQ_Bycopy) 3322 S += 'O'; 3323 if (QT & Decl::OBJC_TQ_Byref) 3324 S += 'R'; 3325 if (QT & Decl::OBJC_TQ_Oneway) 3326 S += 'V'; 3327} 3328 3329void ASTContext::setBuiltinVaListType(QualType T) { 3330 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3331 3332 BuiltinVaListType = T; 3333} 3334 3335void ASTContext::setObjCIdType(QualType T) { 3336 ObjCIdTypedefType = T; 3337} 3338 3339void ASTContext::setObjCSelType(QualType T) { 3340 ObjCSelType = T; 3341 3342 const TypedefType *TT = T->getAs<TypedefType>(); 3343 if (!TT) 3344 return; 3345 TypedefDecl *TD = TT->getDecl(); 3346 3347 // typedef struct objc_selector *SEL; 3348 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3349 if (!ptr) 3350 return; 3351 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3352 if (!rec) 3353 return; 3354 SelStructType = rec; 3355} 3356 3357void ASTContext::setObjCProtoType(QualType QT) { 3358 ObjCProtoType = QT; 3359} 3360 3361void ASTContext::setObjCClassType(QualType T) { 3362 ObjCClassTypedefType = T; 3363} 3364 3365void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3366 assert(ObjCConstantStringType.isNull() && 3367 "'NSConstantString' type already set!"); 3368 3369 ObjCConstantStringType = getObjCInterfaceType(Decl); 3370} 3371 3372/// \brief Retrieve the template name that represents a qualified 3373/// template name such as \c std::vector. 3374TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3375 bool TemplateKeyword, 3376 TemplateDecl *Template) { 3377 llvm::FoldingSetNodeID ID; 3378 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3379 3380 void *InsertPos = 0; 3381 QualifiedTemplateName *QTN = 3382 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3383 if (!QTN) { 3384 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3385 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3386 } 3387 3388 return TemplateName(QTN); 3389} 3390 3391/// \brief Retrieve the template name that represents a qualified 3392/// template name such as \c std::vector. 3393TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3394 bool TemplateKeyword, 3395 OverloadedFunctionDecl *Template) { 3396 llvm::FoldingSetNodeID ID; 3397 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3398 3399 void *InsertPos = 0; 3400 QualifiedTemplateName *QTN = 3401 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3402 if (!QTN) { 3403 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3404 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3405 } 3406 3407 return TemplateName(QTN); 3408} 3409 3410/// \brief Retrieve the template name that represents a dependent 3411/// template name such as \c MetaFun::template apply. 3412TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3413 const IdentifierInfo *Name) { 3414 assert((!NNS || NNS->isDependent()) && 3415 "Nested name specifier must be dependent"); 3416 3417 llvm::FoldingSetNodeID ID; 3418 DependentTemplateName::Profile(ID, NNS, Name); 3419 3420 void *InsertPos = 0; 3421 DependentTemplateName *QTN = 3422 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3423 3424 if (QTN) 3425 return TemplateName(QTN); 3426 3427 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3428 if (CanonNNS == NNS) { 3429 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3430 } else { 3431 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3432 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3433 } 3434 3435 DependentTemplateNames.InsertNode(QTN, InsertPos); 3436 return TemplateName(QTN); 3437} 3438 3439/// getFromTargetType - Given one of the integer types provided by 3440/// TargetInfo, produce the corresponding type. The unsigned @p Type 3441/// is actually a value of type @c TargetInfo::IntType. 3442QualType ASTContext::getFromTargetType(unsigned Type) const { 3443 switch (Type) { 3444 case TargetInfo::NoInt: return QualType(); 3445 case TargetInfo::SignedShort: return ShortTy; 3446 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3447 case TargetInfo::SignedInt: return IntTy; 3448 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3449 case TargetInfo::SignedLong: return LongTy; 3450 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3451 case TargetInfo::SignedLongLong: return LongLongTy; 3452 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3453 } 3454 3455 assert(false && "Unhandled TargetInfo::IntType value"); 3456 return QualType(); 3457} 3458 3459//===----------------------------------------------------------------------===// 3460// Type Predicates. 3461//===----------------------------------------------------------------------===// 3462 3463/// isObjCNSObjectType - Return true if this is an NSObject object using 3464/// NSObject attribute on a c-style pointer type. 3465/// FIXME - Make it work directly on types. 3466/// FIXME: Move to Type. 3467/// 3468bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3469 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3470 if (TypedefDecl *TD = TDT->getDecl()) 3471 if (TD->getAttr<ObjCNSObjectAttr>()) 3472 return true; 3473 } 3474 return false; 3475} 3476 3477/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3478/// garbage collection attribute. 3479/// 3480Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3481 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3482 if (getLangOptions().ObjC1 && 3483 getLangOptions().getGCMode() != LangOptions::NonGC) { 3484 GCAttrs = Ty.getObjCGCAttr(); 3485 // Default behavious under objective-c's gc is for objective-c pointers 3486 // (or pointers to them) be treated as though they were declared 3487 // as __strong. 3488 if (GCAttrs == Qualifiers::GCNone) { 3489 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3490 GCAttrs = Qualifiers::Strong; 3491 else if (Ty->isPointerType()) 3492 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3493 } 3494 // Non-pointers have none gc'able attribute regardless of the attribute 3495 // set on them. 3496 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3497 return Qualifiers::GCNone; 3498 } 3499 return GCAttrs; 3500} 3501 3502//===----------------------------------------------------------------------===// 3503// Type Compatibility Testing 3504//===----------------------------------------------------------------------===// 3505 3506/// areCompatVectorTypes - Return true if the two specified vector types are 3507/// compatible. 3508static bool areCompatVectorTypes(const VectorType *LHS, 3509 const VectorType *RHS) { 3510 assert(LHS->isCanonical() && RHS->isCanonical()); 3511 return LHS->getElementType() == RHS->getElementType() && 3512 LHS->getNumElements() == RHS->getNumElements(); 3513} 3514 3515//===----------------------------------------------------------------------===// 3516// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3517//===----------------------------------------------------------------------===// 3518 3519/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3520/// inheritance hierarchy of 'rProto'. 3521bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3522 ObjCProtocolDecl *rProto) { 3523 if (lProto == rProto) 3524 return true; 3525 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3526 E = rProto->protocol_end(); PI != E; ++PI) 3527 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3528 return true; 3529 return false; 3530} 3531 3532/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3533/// return true if lhs's protocols conform to rhs's protocol; false 3534/// otherwise. 3535bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3536 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3537 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3538 return false; 3539} 3540 3541/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3542/// ObjCQualifiedIDType. 3543bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3544 bool compare) { 3545 // Allow id<P..> and an 'id' or void* type in all cases. 3546 if (lhs->isVoidPointerType() || 3547 lhs->isObjCIdType() || lhs->isObjCClassType()) 3548 return true; 3549 else if (rhs->isVoidPointerType() || 3550 rhs->isObjCIdType() || rhs->isObjCClassType()) 3551 return true; 3552 3553 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3554 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3555 3556 if (!rhsOPT) return false; 3557 3558 if (rhsOPT->qual_empty()) { 3559 // If the RHS is a unqualified interface pointer "NSString*", 3560 // make sure we check the class hierarchy. 3561 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3562 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3563 E = lhsQID->qual_end(); I != E; ++I) { 3564 // when comparing an id<P> on lhs with a static type on rhs, 3565 // see if static class implements all of id's protocols, directly or 3566 // through its super class and categories. 3567 if (!rhsID->ClassImplementsProtocol(*I, true)) 3568 return false; 3569 } 3570 } 3571 // If there are no qualifiers and no interface, we have an 'id'. 3572 return true; 3573 } 3574 // Both the right and left sides have qualifiers. 3575 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3576 E = lhsQID->qual_end(); I != E; ++I) { 3577 ObjCProtocolDecl *lhsProto = *I; 3578 bool match = false; 3579 3580 // when comparing an id<P> on lhs with a static type on rhs, 3581 // see if static class implements all of id's protocols, directly or 3582 // through its super class and categories. 3583 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3584 E = rhsOPT->qual_end(); J != E; ++J) { 3585 ObjCProtocolDecl *rhsProto = *J; 3586 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3587 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3588 match = true; 3589 break; 3590 } 3591 } 3592 // If the RHS is a qualified interface pointer "NSString<P>*", 3593 // make sure we check the class hierarchy. 3594 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3595 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3596 E = lhsQID->qual_end(); I != E; ++I) { 3597 // when comparing an id<P> on lhs with a static type on rhs, 3598 // see if static class implements all of id's protocols, directly or 3599 // through its super class and categories. 3600 if (rhsID->ClassImplementsProtocol(*I, true)) { 3601 match = true; 3602 break; 3603 } 3604 } 3605 } 3606 if (!match) 3607 return false; 3608 } 3609 3610 return true; 3611 } 3612 3613 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3614 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3615 3616 if (const ObjCObjectPointerType *lhsOPT = 3617 lhs->getAsObjCInterfacePointerType()) { 3618 if (lhsOPT->qual_empty()) { 3619 bool match = false; 3620 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3621 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3622 E = rhsQID->qual_end(); I != E; ++I) { 3623 // when comparing an id<P> on lhs with a static type on rhs, 3624 // see if static class implements all of id's protocols, directly or 3625 // through its super class and categories. 3626 if (lhsID->ClassImplementsProtocol(*I, true)) { 3627 match = true; 3628 break; 3629 } 3630 } 3631 if (!match) 3632 return false; 3633 } 3634 return true; 3635 } 3636 // Both the right and left sides have qualifiers. 3637 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3638 E = lhsOPT->qual_end(); I != E; ++I) { 3639 ObjCProtocolDecl *lhsProto = *I; 3640 bool match = false; 3641 3642 // when comparing an id<P> on lhs with a static type on rhs, 3643 // see if static class implements all of id's protocols, directly or 3644 // through its super class and categories. 3645 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3646 E = rhsQID->qual_end(); J != E; ++J) { 3647 ObjCProtocolDecl *rhsProto = *J; 3648 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3649 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3650 match = true; 3651 break; 3652 } 3653 } 3654 if (!match) 3655 return false; 3656 } 3657 return true; 3658 } 3659 return false; 3660} 3661 3662/// canAssignObjCInterfaces - Return true if the two interface types are 3663/// compatible for assignment from RHS to LHS. This handles validation of any 3664/// protocol qualifiers on the LHS or RHS. 3665/// 3666bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3667 const ObjCObjectPointerType *RHSOPT) { 3668 // If either type represents the built-in 'id' or 'Class' types, return true. 3669 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3670 return true; 3671 3672 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3673 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3674 QualType(RHSOPT,0), 3675 false); 3676 3677 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3678 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3679 if (LHS && RHS) // We have 2 user-defined types. 3680 return canAssignObjCInterfaces(LHS, RHS); 3681 3682 return false; 3683} 3684 3685bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3686 const ObjCInterfaceType *RHS) { 3687 // Verify that the base decls are compatible: the RHS must be a subclass of 3688 // the LHS. 3689 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3690 return false; 3691 3692 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3693 // protocol qualified at all, then we are good. 3694 if (LHS->getNumProtocols() == 0) 3695 return true; 3696 3697 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3698 // isn't a superset. 3699 if (RHS->getNumProtocols() == 0) 3700 return true; // FIXME: should return false! 3701 3702 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3703 LHSPE = LHS->qual_end(); 3704 LHSPI != LHSPE; LHSPI++) { 3705 bool RHSImplementsProtocol = false; 3706 3707 // If the RHS doesn't implement the protocol on the left, the types 3708 // are incompatible. 3709 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3710 RHSPE = RHS->qual_end(); 3711 RHSPI != RHSPE; RHSPI++) { 3712 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3713 RHSImplementsProtocol = true; 3714 break; 3715 } 3716 } 3717 // FIXME: For better diagnostics, consider passing back the protocol name. 3718 if (!RHSImplementsProtocol) 3719 return false; 3720 } 3721 // The RHS implements all protocols listed on the LHS. 3722 return true; 3723} 3724 3725bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3726 // get the "pointed to" types 3727 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 3728 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 3729 3730 if (!LHSOPT || !RHSOPT) 3731 return false; 3732 3733 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3734 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3735} 3736 3737/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3738/// both shall have the identically qualified version of a compatible type. 3739/// C99 6.2.7p1: Two types have compatible types if their types are the 3740/// same. See 6.7.[2,3,5] for additional rules. 3741bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3742 return !mergeTypes(LHS, RHS).isNull(); 3743} 3744 3745QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3746 const FunctionType *lbase = lhs->getAs<FunctionType>(); 3747 const FunctionType *rbase = rhs->getAs<FunctionType>(); 3748 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3749 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3750 bool allLTypes = true; 3751 bool allRTypes = true; 3752 3753 // Check return type 3754 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3755 if (retType.isNull()) return QualType(); 3756 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3757 allLTypes = false; 3758 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3759 allRTypes = false; 3760 // FIXME: double check this 3761 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 3762 if (NoReturn != lbase->getNoReturnAttr()) 3763 allLTypes = false; 3764 if (NoReturn != rbase->getNoReturnAttr()) 3765 allRTypes = false; 3766 3767 if (lproto && rproto) { // two C99 style function prototypes 3768 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3769 "C++ shouldn't be here"); 3770 unsigned lproto_nargs = lproto->getNumArgs(); 3771 unsigned rproto_nargs = rproto->getNumArgs(); 3772 3773 // Compatible functions must have the same number of arguments 3774 if (lproto_nargs != rproto_nargs) 3775 return QualType(); 3776 3777 // Variadic and non-variadic functions aren't compatible 3778 if (lproto->isVariadic() != rproto->isVariadic()) 3779 return QualType(); 3780 3781 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3782 return QualType(); 3783 3784 // Check argument compatibility 3785 llvm::SmallVector<QualType, 10> types; 3786 for (unsigned i = 0; i < lproto_nargs; i++) { 3787 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3788 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3789 QualType argtype = mergeTypes(largtype, rargtype); 3790 if (argtype.isNull()) return QualType(); 3791 types.push_back(argtype); 3792 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3793 allLTypes = false; 3794 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3795 allRTypes = false; 3796 } 3797 if (allLTypes) return lhs; 3798 if (allRTypes) return rhs; 3799 return getFunctionType(retType, types.begin(), types.size(), 3800 lproto->isVariadic(), lproto->getTypeQuals(), 3801 NoReturn); 3802 } 3803 3804 if (lproto) allRTypes = false; 3805 if (rproto) allLTypes = false; 3806 3807 const FunctionProtoType *proto = lproto ? lproto : rproto; 3808 if (proto) { 3809 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3810 if (proto->isVariadic()) return QualType(); 3811 // Check that the types are compatible with the types that 3812 // would result from default argument promotions (C99 6.7.5.3p15). 3813 // The only types actually affected are promotable integer 3814 // types and floats, which would be passed as a different 3815 // type depending on whether the prototype is visible. 3816 unsigned proto_nargs = proto->getNumArgs(); 3817 for (unsigned i = 0; i < proto_nargs; ++i) { 3818 QualType argTy = proto->getArgType(i); 3819 if (argTy->isPromotableIntegerType() || 3820 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3821 return QualType(); 3822 } 3823 3824 if (allLTypes) return lhs; 3825 if (allRTypes) return rhs; 3826 return getFunctionType(retType, proto->arg_type_begin(), 3827 proto->getNumArgs(), proto->isVariadic(), 3828 proto->getTypeQuals(), NoReturn); 3829 } 3830 3831 if (allLTypes) return lhs; 3832 if (allRTypes) return rhs; 3833 return getFunctionNoProtoType(retType, NoReturn); 3834} 3835 3836QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3837 // C++ [expr]: If an expression initially has the type "reference to T", the 3838 // type is adjusted to "T" prior to any further analysis, the expression 3839 // designates the object or function denoted by the reference, and the 3840 // expression is an lvalue unless the reference is an rvalue reference and 3841 // the expression is a function call (possibly inside parentheses). 3842 // FIXME: C++ shouldn't be going through here! The rules are different 3843 // enough that they should be handled separately. 3844 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3845 // shouldn't be going through here! 3846 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 3847 LHS = RT->getPointeeType(); 3848 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 3849 RHS = RT->getPointeeType(); 3850 3851 QualType LHSCan = getCanonicalType(LHS), 3852 RHSCan = getCanonicalType(RHS); 3853 3854 // If two types are identical, they are compatible. 3855 if (LHSCan == RHSCan) 3856 return LHS; 3857 3858 // If the qualifiers are different, the types aren't compatible... mostly. 3859 Qualifiers LQuals = LHSCan.getQualifiers(); 3860 Qualifiers RQuals = RHSCan.getQualifiers(); 3861 if (LQuals != RQuals) { 3862 // If any of these qualifiers are different, we have a type 3863 // mismatch. 3864 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 3865 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 3866 return QualType(); 3867 3868 // Exactly one GC qualifier difference is allowed: __strong is 3869 // okay if the other type has no GC qualifier but is an Objective 3870 // C object pointer (i.e. implicitly strong by default). We fix 3871 // this by pretending that the unqualified type was actually 3872 // qualified __strong. 3873 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 3874 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 3875 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 3876 3877 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 3878 return QualType(); 3879 3880 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 3881 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 3882 } 3883 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 3884 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 3885 } 3886 return QualType(); 3887 } 3888 3889 // Okay, qualifiers are equal. 3890 3891 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3892 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3893 3894 // We want to consider the two function types to be the same for these 3895 // comparisons, just force one to the other. 3896 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3897 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3898 3899 // Same as above for arrays 3900 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3901 LHSClass = Type::ConstantArray; 3902 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3903 RHSClass = Type::ConstantArray; 3904 3905 // Canonicalize ExtVector -> Vector. 3906 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3907 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3908 3909 // If the canonical type classes don't match. 3910 if (LHSClass != RHSClass) { 3911 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3912 // a signed integer type, or an unsigned integer type. 3913 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 3914 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3915 return RHS; 3916 } 3917 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 3918 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3919 return LHS; 3920 } 3921 3922 return QualType(); 3923 } 3924 3925 // The canonical type classes match. 3926 switch (LHSClass) { 3927#define TYPE(Class, Base) 3928#define ABSTRACT_TYPE(Class, Base) 3929#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3930#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3931#include "clang/AST/TypeNodes.def" 3932 assert(false && "Non-canonical and dependent types shouldn't get here"); 3933 return QualType(); 3934 3935 case Type::LValueReference: 3936 case Type::RValueReference: 3937 case Type::MemberPointer: 3938 assert(false && "C++ should never be in mergeTypes"); 3939 return QualType(); 3940 3941 case Type::IncompleteArray: 3942 case Type::VariableArray: 3943 case Type::FunctionProto: 3944 case Type::ExtVector: 3945 assert(false && "Types are eliminated above"); 3946 return QualType(); 3947 3948 case Type::Pointer: 3949 { 3950 // Merge two pointer types, while trying to preserve typedef info 3951 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 3952 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 3953 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3954 if (ResultType.isNull()) return QualType(); 3955 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3956 return LHS; 3957 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3958 return RHS; 3959 return getPointerType(ResultType); 3960 } 3961 case Type::BlockPointer: 3962 { 3963 // Merge two block pointer types, while trying to preserve typedef info 3964 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 3965 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 3966 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3967 if (ResultType.isNull()) return QualType(); 3968 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3969 return LHS; 3970 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3971 return RHS; 3972 return getBlockPointerType(ResultType); 3973 } 3974 case Type::ConstantArray: 3975 { 3976 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3977 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3978 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3979 return QualType(); 3980 3981 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3982 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3983 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3984 if (ResultType.isNull()) return QualType(); 3985 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3986 return LHS; 3987 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3988 return RHS; 3989 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3990 ArrayType::ArraySizeModifier(), 0); 3991 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3992 ArrayType::ArraySizeModifier(), 0); 3993 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3994 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3995 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3996 return LHS; 3997 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3998 return RHS; 3999 if (LVAT) { 4000 // FIXME: This isn't correct! But tricky to implement because 4001 // the array's size has to be the size of LHS, but the type 4002 // has to be different. 4003 return LHS; 4004 } 4005 if (RVAT) { 4006 // FIXME: This isn't correct! But tricky to implement because 4007 // the array's size has to be the size of RHS, but the type 4008 // has to be different. 4009 return RHS; 4010 } 4011 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4012 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4013 return getIncompleteArrayType(ResultType, 4014 ArrayType::ArraySizeModifier(), 0); 4015 } 4016 case Type::FunctionNoProto: 4017 return mergeFunctionTypes(LHS, RHS); 4018 case Type::Record: 4019 case Type::Enum: 4020 return QualType(); 4021 case Type::Builtin: 4022 // Only exactly equal builtin types are compatible, which is tested above. 4023 return QualType(); 4024 case Type::Complex: 4025 // Distinct complex types are incompatible. 4026 return QualType(); 4027 case Type::Vector: 4028 // FIXME: The merged type should be an ExtVector! 4029 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 4030 return LHS; 4031 return QualType(); 4032 case Type::ObjCInterface: { 4033 // Check if the interfaces are assignment compatible. 4034 // FIXME: This should be type compatibility, e.g. whether 4035 // "LHS x; RHS x;" at global scope is legal. 4036 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 4037 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 4038 if (LHSIface && RHSIface && 4039 canAssignObjCInterfaces(LHSIface, RHSIface)) 4040 return LHS; 4041 4042 return QualType(); 4043 } 4044 case Type::ObjCObjectPointer: { 4045 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4046 RHS->getAs<ObjCObjectPointerType>())) 4047 return LHS; 4048 4049 return QualType(); 4050 } 4051 case Type::FixedWidthInt: 4052 // Distinct fixed-width integers are not compatible. 4053 return QualType(); 4054 case Type::TemplateSpecialization: 4055 assert(false && "Dependent types have no size"); 4056 break; 4057 } 4058 4059 return QualType(); 4060} 4061 4062//===----------------------------------------------------------------------===// 4063// Integer Predicates 4064//===----------------------------------------------------------------------===// 4065 4066unsigned ASTContext::getIntWidth(QualType T) { 4067 if (T == BoolTy) 4068 return 1; 4069 if (FixedWidthIntType *FWIT = dyn_cast<FixedWidthIntType>(T)) { 4070 return FWIT->getWidth(); 4071 } 4072 // For builtin types, just use the standard type sizing method 4073 return (unsigned)getTypeSize(T); 4074} 4075 4076QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4077 assert(T->isSignedIntegerType() && "Unexpected type"); 4078 4079 // Turn <4 x signed int> -> <4 x unsigned int> 4080 if (const VectorType *VTy = T->getAs<VectorType>()) 4081 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4082 VTy->getNumElements()); 4083 4084 // For enums, we return the unsigned version of the base type. 4085 if (const EnumType *ETy = T->getAs<EnumType>()) 4086 T = ETy->getDecl()->getIntegerType(); 4087 4088 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4089 assert(BTy && "Unexpected signed integer type"); 4090 switch (BTy->getKind()) { 4091 case BuiltinType::Char_S: 4092 case BuiltinType::SChar: 4093 return UnsignedCharTy; 4094 case BuiltinType::Short: 4095 return UnsignedShortTy; 4096 case BuiltinType::Int: 4097 return UnsignedIntTy; 4098 case BuiltinType::Long: 4099 return UnsignedLongTy; 4100 case BuiltinType::LongLong: 4101 return UnsignedLongLongTy; 4102 case BuiltinType::Int128: 4103 return UnsignedInt128Ty; 4104 default: 4105 assert(0 && "Unexpected signed integer type"); 4106 return QualType(); 4107 } 4108} 4109 4110ExternalASTSource::~ExternalASTSource() { } 4111 4112void ExternalASTSource::PrintStats() { } 4113 4114 4115//===----------------------------------------------------------------------===// 4116// Builtin Type Computation 4117//===----------------------------------------------------------------------===// 4118 4119/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4120/// pointer over the consumed characters. This returns the resultant type. 4121static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4122 ASTContext::GetBuiltinTypeError &Error, 4123 bool AllowTypeModifiers = true) { 4124 // Modifiers. 4125 int HowLong = 0; 4126 bool Signed = false, Unsigned = false; 4127 4128 // Read the modifiers first. 4129 bool Done = false; 4130 while (!Done) { 4131 switch (*Str++) { 4132 default: Done = true; --Str; break; 4133 case 'S': 4134 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4135 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4136 Signed = true; 4137 break; 4138 case 'U': 4139 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4140 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4141 Unsigned = true; 4142 break; 4143 case 'L': 4144 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4145 ++HowLong; 4146 break; 4147 } 4148 } 4149 4150 QualType Type; 4151 4152 // Read the base type. 4153 switch (*Str++) { 4154 default: assert(0 && "Unknown builtin type letter!"); 4155 case 'v': 4156 assert(HowLong == 0 && !Signed && !Unsigned && 4157 "Bad modifiers used with 'v'!"); 4158 Type = Context.VoidTy; 4159 break; 4160 case 'f': 4161 assert(HowLong == 0 && !Signed && !Unsigned && 4162 "Bad modifiers used with 'f'!"); 4163 Type = Context.FloatTy; 4164 break; 4165 case 'd': 4166 assert(HowLong < 2 && !Signed && !Unsigned && 4167 "Bad modifiers used with 'd'!"); 4168 if (HowLong) 4169 Type = Context.LongDoubleTy; 4170 else 4171 Type = Context.DoubleTy; 4172 break; 4173 case 's': 4174 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4175 if (Unsigned) 4176 Type = Context.UnsignedShortTy; 4177 else 4178 Type = Context.ShortTy; 4179 break; 4180 case 'i': 4181 if (HowLong == 3) 4182 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4183 else if (HowLong == 2) 4184 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4185 else if (HowLong == 1) 4186 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4187 else 4188 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4189 break; 4190 case 'c': 4191 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4192 if (Signed) 4193 Type = Context.SignedCharTy; 4194 else if (Unsigned) 4195 Type = Context.UnsignedCharTy; 4196 else 4197 Type = Context.CharTy; 4198 break; 4199 case 'b': // boolean 4200 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4201 Type = Context.BoolTy; 4202 break; 4203 case 'z': // size_t. 4204 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4205 Type = Context.getSizeType(); 4206 break; 4207 case 'F': 4208 Type = Context.getCFConstantStringType(); 4209 break; 4210 case 'a': 4211 Type = Context.getBuiltinVaListType(); 4212 assert(!Type.isNull() && "builtin va list type not initialized!"); 4213 break; 4214 case 'A': 4215 // This is a "reference" to a va_list; however, what exactly 4216 // this means depends on how va_list is defined. There are two 4217 // different kinds of va_list: ones passed by value, and ones 4218 // passed by reference. An example of a by-value va_list is 4219 // x86, where va_list is a char*. An example of by-ref va_list 4220 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4221 // we want this argument to be a char*&; for x86-64, we want 4222 // it to be a __va_list_tag*. 4223 Type = Context.getBuiltinVaListType(); 4224 assert(!Type.isNull() && "builtin va list type not initialized!"); 4225 if (Type->isArrayType()) { 4226 Type = Context.getArrayDecayedType(Type); 4227 } else { 4228 Type = Context.getLValueReferenceType(Type); 4229 } 4230 break; 4231 case 'V': { 4232 char *End; 4233 unsigned NumElements = strtoul(Str, &End, 10); 4234 assert(End != Str && "Missing vector size"); 4235 4236 Str = End; 4237 4238 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4239 Type = Context.getVectorType(ElementType, NumElements); 4240 break; 4241 } 4242 case 'X': { 4243 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4244 Type = Context.getComplexType(ElementType); 4245 break; 4246 } 4247 case 'P': 4248 Type = Context.getFILEType(); 4249 if (Type.isNull()) { 4250 Error = ASTContext::GE_Missing_stdio; 4251 return QualType(); 4252 } 4253 break; 4254 case 'J': 4255 if (Signed) 4256 Type = Context.getsigjmp_bufType(); 4257 else 4258 Type = Context.getjmp_bufType(); 4259 4260 if (Type.isNull()) { 4261 Error = ASTContext::GE_Missing_setjmp; 4262 return QualType(); 4263 } 4264 break; 4265 } 4266 4267 if (!AllowTypeModifiers) 4268 return Type; 4269 4270 Done = false; 4271 while (!Done) { 4272 switch (*Str++) { 4273 default: Done = true; --Str; break; 4274 case '*': 4275 Type = Context.getPointerType(Type); 4276 break; 4277 case '&': 4278 Type = Context.getLValueReferenceType(Type); 4279 break; 4280 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4281 case 'C': 4282 Type = Type.withConst(); 4283 break; 4284 } 4285 } 4286 4287 return Type; 4288} 4289 4290/// GetBuiltinType - Return the type for the specified builtin. 4291QualType ASTContext::GetBuiltinType(unsigned id, 4292 GetBuiltinTypeError &Error) { 4293 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4294 4295 llvm::SmallVector<QualType, 8> ArgTypes; 4296 4297 Error = GE_None; 4298 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4299 if (Error != GE_None) 4300 return QualType(); 4301 while (TypeStr[0] && TypeStr[0] != '.') { 4302 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4303 if (Error != GE_None) 4304 return QualType(); 4305 4306 // Do array -> pointer decay. The builtin should use the decayed type. 4307 if (Ty->isArrayType()) 4308 Ty = getArrayDecayedType(Ty); 4309 4310 ArgTypes.push_back(Ty); 4311 } 4312 4313 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4314 "'.' should only occur at end of builtin type list!"); 4315 4316 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4317 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4318 return getFunctionNoProtoType(ResType); 4319 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4320 TypeStr[0] == '.', 0); 4321} 4322 4323QualType 4324ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4325 // Perform the usual unary conversions. We do this early so that 4326 // integral promotions to "int" can allow us to exit early, in the 4327 // lhs == rhs check. Also, for conversion purposes, we ignore any 4328 // qualifiers. For example, "const float" and "float" are 4329 // equivalent. 4330 if (lhs->isPromotableIntegerType()) 4331 lhs = getPromotedIntegerType(lhs); 4332 else 4333 lhs = lhs.getUnqualifiedType(); 4334 if (rhs->isPromotableIntegerType()) 4335 rhs = getPromotedIntegerType(rhs); 4336 else 4337 rhs = rhs.getUnqualifiedType(); 4338 4339 // If both types are identical, no conversion is needed. 4340 if (lhs == rhs) 4341 return lhs; 4342 4343 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4344 // The caller can deal with this (e.g. pointer + int). 4345 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4346 return lhs; 4347 4348 // At this point, we have two different arithmetic types. 4349 4350 // Handle complex types first (C99 6.3.1.8p1). 4351 if (lhs->isComplexType() || rhs->isComplexType()) { 4352 // if we have an integer operand, the result is the complex type. 4353 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4354 // convert the rhs to the lhs complex type. 4355 return lhs; 4356 } 4357 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4358 // convert the lhs to the rhs complex type. 4359 return rhs; 4360 } 4361 // This handles complex/complex, complex/float, or float/complex. 4362 // When both operands are complex, the shorter operand is converted to the 4363 // type of the longer, and that is the type of the result. This corresponds 4364 // to what is done when combining two real floating-point operands. 4365 // The fun begins when size promotion occur across type domains. 4366 // From H&S 6.3.4: When one operand is complex and the other is a real 4367 // floating-point type, the less precise type is converted, within it's 4368 // real or complex domain, to the precision of the other type. For example, 4369 // when combining a "long double" with a "double _Complex", the 4370 // "double _Complex" is promoted to "long double _Complex". 4371 int result = getFloatingTypeOrder(lhs, rhs); 4372 4373 if (result > 0) { // The left side is bigger, convert rhs. 4374 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4375 } else if (result < 0) { // The right side is bigger, convert lhs. 4376 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4377 } 4378 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4379 // domains match. This is a requirement for our implementation, C99 4380 // does not require this promotion. 4381 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4382 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4383 return rhs; 4384 } else { // handle "_Complex double, double". 4385 return lhs; 4386 } 4387 } 4388 return lhs; // The domain/size match exactly. 4389 } 4390 // Now handle "real" floating types (i.e. float, double, long double). 4391 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4392 // if we have an integer operand, the result is the real floating type. 4393 if (rhs->isIntegerType()) { 4394 // convert rhs to the lhs floating point type. 4395 return lhs; 4396 } 4397 if (rhs->isComplexIntegerType()) { 4398 // convert rhs to the complex floating point type. 4399 return getComplexType(lhs); 4400 } 4401 if (lhs->isIntegerType()) { 4402 // convert lhs to the rhs floating point type. 4403 return rhs; 4404 } 4405 if (lhs->isComplexIntegerType()) { 4406 // convert lhs to the complex floating point type. 4407 return getComplexType(rhs); 4408 } 4409 // We have two real floating types, float/complex combos were handled above. 4410 // Convert the smaller operand to the bigger result. 4411 int result = getFloatingTypeOrder(lhs, rhs); 4412 if (result > 0) // convert the rhs 4413 return lhs; 4414 assert(result < 0 && "illegal float comparison"); 4415 return rhs; // convert the lhs 4416 } 4417 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4418 // Handle GCC complex int extension. 4419 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4420 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4421 4422 if (lhsComplexInt && rhsComplexInt) { 4423 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4424 rhsComplexInt->getElementType()) >= 0) 4425 return lhs; // convert the rhs 4426 return rhs; 4427 } else if (lhsComplexInt && rhs->isIntegerType()) { 4428 // convert the rhs to the lhs complex type. 4429 return lhs; 4430 } else if (rhsComplexInt && lhs->isIntegerType()) { 4431 // convert the lhs to the rhs complex type. 4432 return rhs; 4433 } 4434 } 4435 // Finally, we have two differing integer types. 4436 // The rules for this case are in C99 6.3.1.8 4437 int compare = getIntegerTypeOrder(lhs, rhs); 4438 bool lhsSigned = lhs->isSignedIntegerType(), 4439 rhsSigned = rhs->isSignedIntegerType(); 4440 QualType destType; 4441 if (lhsSigned == rhsSigned) { 4442 // Same signedness; use the higher-ranked type 4443 destType = compare >= 0 ? lhs : rhs; 4444 } else if (compare != (lhsSigned ? 1 : -1)) { 4445 // The unsigned type has greater than or equal rank to the 4446 // signed type, so use the unsigned type 4447 destType = lhsSigned ? rhs : lhs; 4448 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4449 // The two types are different widths; if we are here, that 4450 // means the signed type is larger than the unsigned type, so 4451 // use the signed type. 4452 destType = lhsSigned ? lhs : rhs; 4453 } else { 4454 // The signed type is higher-ranked than the unsigned type, 4455 // but isn't actually any bigger (like unsigned int and long 4456 // on most 32-bit systems). Use the unsigned type corresponding 4457 // to the signed type. 4458 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4459 } 4460 return destType; 4461} 4462