ASTContext.cpp revision ed97649e9574b9d854fa4d6109c9333ae0993554
1//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclCXX.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/TypeLoc.h" 19#include "clang/AST/Expr.h" 20#include "clang/AST/ExternalASTSource.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/Basic/Builtins.h" 23#include "clang/Basic/SourceManager.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/ADT/SmallString.h" 26#include "llvm/ADT/StringExtras.h" 27#include "llvm/Support/MathExtras.h" 28#include "llvm/Support/raw_ostream.h" 29#include "RecordLayoutBuilder.h" 30 31using namespace clang; 32 33enum FloatingRank { 34 FloatRank, DoubleRank, LongDoubleRank 35}; 36 37ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 38 const TargetInfo &t, 39 IdentifierTable &idents, SelectorTable &sels, 40 Builtin::Context &builtins, 41 bool FreeMem, unsigned size_reserve) : 42 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 43 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 44 sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0), 45 SourceMgr(SM), LangOpts(LOpts), 46 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 47 Idents(idents), Selectors(sels), 48 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 49 ObjCIdRedefinitionType = QualType(); 50 ObjCClassRedefinitionType = QualType(); 51 ObjCSelRedefinitionType = QualType(); 52 if (size_reserve > 0) Types.reserve(size_reserve); 53 TUDecl = TranslationUnitDecl::Create(*this); 54 InitBuiltinTypes(); 55} 56 57ASTContext::~ASTContext() { 58 // Deallocate all the types. 59 while (!Types.empty()) { 60 Types.back()->Destroy(*this); 61 Types.pop_back(); 62 } 63 64 { 65 llvm::FoldingSet<ExtQuals>::iterator 66 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); 67 while (I != E) 68 Deallocate(&*I++); 69 } 70 71 { 72 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 73 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 74 while (I != E) { 75 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 76 delete R; 77 } 78 } 79 80 { 81 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 82 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 83 while (I != E) { 84 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 85 delete R; 86 } 87 } 88 89 // Destroy nested-name-specifiers. 90 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 91 NNS = NestedNameSpecifiers.begin(), 92 NNSEnd = NestedNameSpecifiers.end(); 93 NNS != NNSEnd; 94 /* Increment in loop */) 95 (*NNS++).Destroy(*this); 96 97 if (GlobalNestedNameSpecifier) 98 GlobalNestedNameSpecifier->Destroy(*this); 99 100 TUDecl->Destroy(*this); 101} 102 103void 104ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 105 ExternalSource.reset(Source.take()); 106} 107 108void ASTContext::PrintStats() const { 109 fprintf(stderr, "*** AST Context Stats:\n"); 110 fprintf(stderr, " %d types total.\n", (int)Types.size()); 111 112 unsigned counts[] = { 113#define TYPE(Name, Parent) 0, 114#define ABSTRACT_TYPE(Name, Parent) 115#include "clang/AST/TypeNodes.def" 116 0 // Extra 117 }; 118 119 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 120 Type *T = Types[i]; 121 counts[(unsigned)T->getTypeClass()]++; 122 } 123 124 unsigned Idx = 0; 125 unsigned TotalBytes = 0; 126#define TYPE(Name, Parent) \ 127 if (counts[Idx]) \ 128 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 129 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 130 ++Idx; 131#define ABSTRACT_TYPE(Name, Parent) 132#include "clang/AST/TypeNodes.def" 133 134 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 135 136 if (ExternalSource.get()) { 137 fprintf(stderr, "\n"); 138 ExternalSource->PrintStats(); 139 } 140} 141 142 143void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 144 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 145 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 146 Types.push_back(Ty); 147} 148 149void ASTContext::InitBuiltinTypes() { 150 assert(VoidTy.isNull() && "Context reinitialized?"); 151 152 // C99 6.2.5p19. 153 InitBuiltinType(VoidTy, BuiltinType::Void); 154 155 // C99 6.2.5p2. 156 InitBuiltinType(BoolTy, BuiltinType::Bool); 157 // C99 6.2.5p3. 158 if (LangOpts.CharIsSigned) 159 InitBuiltinType(CharTy, BuiltinType::Char_S); 160 else 161 InitBuiltinType(CharTy, BuiltinType::Char_U); 162 // C99 6.2.5p4. 163 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 164 InitBuiltinType(ShortTy, BuiltinType::Short); 165 InitBuiltinType(IntTy, BuiltinType::Int); 166 InitBuiltinType(LongTy, BuiltinType::Long); 167 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 168 169 // C99 6.2.5p6. 170 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 171 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 172 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 173 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 174 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 175 176 // C99 6.2.5p10. 177 InitBuiltinType(FloatTy, BuiltinType::Float); 178 InitBuiltinType(DoubleTy, BuiltinType::Double); 179 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 180 181 // GNU extension, 128-bit integers. 182 InitBuiltinType(Int128Ty, BuiltinType::Int128); 183 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 184 185 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 186 InitBuiltinType(WCharTy, BuiltinType::WChar); 187 else // C99 188 WCharTy = getFromTargetType(Target.getWCharType()); 189 190 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 191 InitBuiltinType(Char16Ty, BuiltinType::Char16); 192 else // C99 193 Char16Ty = getFromTargetType(Target.getChar16Type()); 194 195 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 196 InitBuiltinType(Char32Ty, BuiltinType::Char32); 197 else // C99 198 Char32Ty = getFromTargetType(Target.getChar32Type()); 199 200 // Placeholder type for functions. 201 InitBuiltinType(OverloadTy, BuiltinType::Overload); 202 203 // Placeholder type for type-dependent expressions whose type is 204 // completely unknown. No code should ever check a type against 205 // DependentTy and users should never see it; however, it is here to 206 // help diagnose failures to properly check for type-dependent 207 // expressions. 208 InitBuiltinType(DependentTy, BuiltinType::Dependent); 209 210 // Placeholder type for C++0x auto declarations whose real type has 211 // not yet been deduced. 212 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 213 214 // C99 6.2.5p11. 215 FloatComplexTy = getComplexType(FloatTy); 216 DoubleComplexTy = getComplexType(DoubleTy); 217 LongDoubleComplexTy = getComplexType(LongDoubleTy); 218 219 BuiltinVaListType = QualType(); 220 221 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 222 ObjCIdTypedefType = QualType(); 223 ObjCClassTypedefType = QualType(); 224 ObjCSelTypedefType = QualType(); 225 226 // Builtin types for 'id', 'Class', and 'SEL'. 227 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 228 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 229 InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel); 230 231 ObjCConstantStringType = QualType(); 232 233 // void * type 234 VoidPtrTy = getPointerType(VoidTy); 235 236 // nullptr type (C++0x 2.14.7) 237 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 238} 239 240MemberSpecializationInfo * 241ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 242 assert(Var->isStaticDataMember() && "Not a static data member"); 243 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 244 = InstantiatedFromStaticDataMember.find(Var); 245 if (Pos == InstantiatedFromStaticDataMember.end()) 246 return 0; 247 248 return Pos->second; 249} 250 251void 252ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 253 TemplateSpecializationKind TSK) { 254 assert(Inst->isStaticDataMember() && "Not a static data member"); 255 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 256 assert(!InstantiatedFromStaticDataMember[Inst] && 257 "Already noted what static data member was instantiated from"); 258 InstantiatedFromStaticDataMember[Inst] 259 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 260} 261 262NamedDecl * 263ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) { 264 llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos 265 = InstantiatedFromUsingDecl.find(UUD); 266 if (Pos == InstantiatedFromUsingDecl.end()) 267 return 0; 268 269 return Pos->second; 270} 271 272void 273ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) { 274 assert((isa<UsingDecl>(Pattern) || 275 isa<UnresolvedUsingValueDecl>(Pattern) || 276 isa<UnresolvedUsingTypenameDecl>(Pattern)) && 277 "pattern decl is not a using decl"); 278 assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists"); 279 InstantiatedFromUsingDecl[Inst] = Pattern; 280} 281 282UsingShadowDecl * 283ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) { 284 llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos 285 = InstantiatedFromUsingShadowDecl.find(Inst); 286 if (Pos == InstantiatedFromUsingShadowDecl.end()) 287 return 0; 288 289 return Pos->second; 290} 291 292void 293ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst, 294 UsingShadowDecl *Pattern) { 295 assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists"); 296 InstantiatedFromUsingShadowDecl[Inst] = Pattern; 297} 298 299FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 300 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 301 = InstantiatedFromUnnamedFieldDecl.find(Field); 302 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 303 return 0; 304 305 return Pos->second; 306} 307 308void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 309 FieldDecl *Tmpl) { 310 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 311 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 312 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 313 "Already noted what unnamed field was instantiated from"); 314 315 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 316} 317 318namespace { 319 class BeforeInTranslationUnit 320 : std::binary_function<SourceRange, SourceRange, bool> { 321 SourceManager *SourceMgr; 322 323 public: 324 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 325 326 bool operator()(SourceRange X, SourceRange Y) { 327 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 328 } 329 }; 330} 331 332/// \brief Determine whether the given comment is a Doxygen-style comment. 333/// 334/// \param Start the start of the comment text. 335/// 336/// \param End the end of the comment text. 337/// 338/// \param Member whether we want to check whether this is a member comment 339/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 340/// we only return true when we find a non-member comment. 341static bool 342isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 343 bool Member = false) { 344 const char *BufferStart 345 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 346 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 347 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 348 349 if (End - Start < 4) 350 return false; 351 352 assert(Start[0] == '/' && "Not a comment?"); 353 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 354 return false; 355 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 356 return false; 357 358 return (Start[3] == '<') == Member; 359} 360 361/// \brief Retrieve the comment associated with the given declaration, if 362/// it has one. 363const char *ASTContext::getCommentForDecl(const Decl *D) { 364 if (!D) 365 return 0; 366 367 // Check whether we have cached a comment string for this declaration 368 // already. 369 llvm::DenseMap<const Decl *, std::string>::iterator Pos 370 = DeclComments.find(D); 371 if (Pos != DeclComments.end()) 372 return Pos->second.c_str(); 373 374 // If we have an external AST source and have not yet loaded comments from 375 // that source, do so now. 376 if (ExternalSource && !LoadedExternalComments) { 377 std::vector<SourceRange> LoadedComments; 378 ExternalSource->ReadComments(LoadedComments); 379 380 if (!LoadedComments.empty()) 381 Comments.insert(Comments.begin(), LoadedComments.begin(), 382 LoadedComments.end()); 383 384 LoadedExternalComments = true; 385 } 386 387 // If there are no comments anywhere, we won't find anything. 388 if (Comments.empty()) 389 return 0; 390 391 // If the declaration doesn't map directly to a location in a file, we 392 // can't find the comment. 393 SourceLocation DeclStartLoc = D->getLocStart(); 394 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 395 return 0; 396 397 // Find the comment that occurs just before this declaration. 398 std::vector<SourceRange>::iterator LastComment 399 = std::lower_bound(Comments.begin(), Comments.end(), 400 SourceRange(DeclStartLoc), 401 BeforeInTranslationUnit(&SourceMgr)); 402 403 // Decompose the location for the start of the declaration and find the 404 // beginning of the file buffer. 405 std::pair<FileID, unsigned> DeclStartDecomp 406 = SourceMgr.getDecomposedLoc(DeclStartLoc); 407 const char *FileBufferStart 408 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 409 410 // First check whether we have a comment for a member. 411 if (LastComment != Comments.end() && 412 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 413 isDoxygenComment(SourceMgr, *LastComment, true)) { 414 std::pair<FileID, unsigned> LastCommentEndDecomp 415 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 416 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 417 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 418 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 419 LastCommentEndDecomp.second)) { 420 // The Doxygen member comment comes after the declaration starts and 421 // is on the same line and in the same file as the declaration. This 422 // is the comment we want. 423 std::string &Result = DeclComments[D]; 424 Result.append(FileBufferStart + 425 SourceMgr.getFileOffset(LastComment->getBegin()), 426 FileBufferStart + LastCommentEndDecomp.second + 1); 427 return Result.c_str(); 428 } 429 } 430 431 if (LastComment == Comments.begin()) 432 return 0; 433 --LastComment; 434 435 // Decompose the end of the comment. 436 std::pair<FileID, unsigned> LastCommentEndDecomp 437 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 438 439 // If the comment and the declaration aren't in the same file, then they 440 // aren't related. 441 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 442 return 0; 443 444 // Check that we actually have a Doxygen comment. 445 if (!isDoxygenComment(SourceMgr, *LastComment)) 446 return 0; 447 448 // Compute the starting line for the declaration and for the end of the 449 // comment (this is expensive). 450 unsigned DeclStartLine 451 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 452 unsigned CommentEndLine 453 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 454 LastCommentEndDecomp.second); 455 456 // If the comment does not end on the line prior to the declaration, then 457 // the comment is not associated with the declaration at all. 458 if (CommentEndLine + 1 != DeclStartLine) 459 return 0; 460 461 // We have a comment, but there may be more comments on the previous lines. 462 // Keep looking so long as the comments are still Doxygen comments and are 463 // still adjacent. 464 unsigned ExpectedLine 465 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 466 std::vector<SourceRange>::iterator FirstComment = LastComment; 467 while (FirstComment != Comments.begin()) { 468 // Look at the previous comment 469 --FirstComment; 470 std::pair<FileID, unsigned> Decomp 471 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 472 473 // If this previous comment is in a different file, we're done. 474 if (Decomp.first != DeclStartDecomp.first) { 475 ++FirstComment; 476 break; 477 } 478 479 // If this comment is not a Doxygen comment, we're done. 480 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 481 ++FirstComment; 482 break; 483 } 484 485 // If the line number is not what we expected, we're done. 486 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 487 if (Line != ExpectedLine) { 488 ++FirstComment; 489 break; 490 } 491 492 // Set the next expected line number. 493 ExpectedLine 494 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 495 } 496 497 // The iterator range [FirstComment, LastComment] contains all of the 498 // BCPL comments that, together, are associated with this declaration. 499 // Form a single comment block string for this declaration that concatenates 500 // all of these comments. 501 std::string &Result = DeclComments[D]; 502 while (FirstComment != LastComment) { 503 std::pair<FileID, unsigned> DecompStart 504 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 505 std::pair<FileID, unsigned> DecompEnd 506 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 507 Result.append(FileBufferStart + DecompStart.second, 508 FileBufferStart + DecompEnd.second + 1); 509 ++FirstComment; 510 } 511 512 // Append the last comment line. 513 Result.append(FileBufferStart + 514 SourceMgr.getFileOffset(LastComment->getBegin()), 515 FileBufferStart + LastCommentEndDecomp.second + 1); 516 return Result.c_str(); 517} 518 519//===----------------------------------------------------------------------===// 520// Type Sizing and Analysis 521//===----------------------------------------------------------------------===// 522 523/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 524/// scalar floating point type. 525const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 526 const BuiltinType *BT = T->getAs<BuiltinType>(); 527 assert(BT && "Not a floating point type!"); 528 switch (BT->getKind()) { 529 default: assert(0 && "Not a floating point type!"); 530 case BuiltinType::Float: return Target.getFloatFormat(); 531 case BuiltinType::Double: return Target.getDoubleFormat(); 532 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 533 } 534} 535 536/// getDeclAlignInBytes - Return a conservative estimate of the alignment of the 537/// specified decl. Note that bitfields do not have a valid alignment, so 538/// this method will assert on them. 539/// If @p RefAsPointee, references are treated like their underlying type 540/// (for alignof), else they're treated like pointers (for CodeGen). 541unsigned ASTContext::getDeclAlignInBytes(const Decl *D, bool RefAsPointee) { 542 unsigned Align = Target.getCharWidth(); 543 544 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 545 Align = std::max(Align, AA->getMaxAlignment()); 546 547 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 548 QualType T = VD->getType(); 549 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 550 if (RefAsPointee) 551 T = RT->getPointeeType(); 552 else 553 T = getPointerType(RT->getPointeeType()); 554 } 555 if (!T->isIncompleteType() && !T->isFunctionType()) { 556 // Incomplete or function types default to 1. 557 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 558 T = cast<ArrayType>(T)->getElementType(); 559 560 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 561 } 562 } 563 564 return Align / Target.getCharWidth(); 565} 566 567/// getTypeSize - Return the size of the specified type, in bits. This method 568/// does not work on incomplete types. 569/// 570/// FIXME: Pointers into different addr spaces could have different sizes and 571/// alignment requirements: getPointerInfo should take an AddrSpace, this 572/// should take a QualType, &c. 573std::pair<uint64_t, unsigned> 574ASTContext::getTypeInfo(const Type *T) { 575 uint64_t Width=0; 576 unsigned Align=8; 577 switch (T->getTypeClass()) { 578#define TYPE(Class, Base) 579#define ABSTRACT_TYPE(Class, Base) 580#define NON_CANONICAL_TYPE(Class, Base) 581#define DEPENDENT_TYPE(Class, Base) case Type::Class: 582#include "clang/AST/TypeNodes.def" 583 assert(false && "Should not see dependent types"); 584 break; 585 586 case Type::FunctionNoProto: 587 case Type::FunctionProto: 588 // GCC extension: alignof(function) = 32 bits 589 Width = 0; 590 Align = 32; 591 break; 592 593 case Type::IncompleteArray: 594 case Type::VariableArray: 595 Width = 0; 596 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 597 break; 598 599 case Type::ConstantArray: { 600 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 601 602 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 603 Width = EltInfo.first*CAT->getSize().getZExtValue(); 604 Align = EltInfo.second; 605 break; 606 } 607 case Type::ExtVector: 608 case Type::Vector: { 609 const VectorType *VT = cast<VectorType>(T); 610 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 611 Width = EltInfo.first*VT->getNumElements(); 612 Align = Width; 613 // If the alignment is not a power of 2, round up to the next power of 2. 614 // This happens for non-power-of-2 length vectors. 615 if (VT->getNumElements() & (VT->getNumElements()-1)) { 616 Align = llvm::NextPowerOf2(Align); 617 Width = llvm::RoundUpToAlignment(Width, Align); 618 } 619 break; 620 } 621 622 case Type::Builtin: 623 switch (cast<BuiltinType>(T)->getKind()) { 624 default: assert(0 && "Unknown builtin type!"); 625 case BuiltinType::Void: 626 // GCC extension: alignof(void) = 8 bits. 627 Width = 0; 628 Align = 8; 629 break; 630 631 case BuiltinType::Bool: 632 Width = Target.getBoolWidth(); 633 Align = Target.getBoolAlign(); 634 break; 635 case BuiltinType::Char_S: 636 case BuiltinType::Char_U: 637 case BuiltinType::UChar: 638 case BuiltinType::SChar: 639 Width = Target.getCharWidth(); 640 Align = Target.getCharAlign(); 641 break; 642 case BuiltinType::WChar: 643 Width = Target.getWCharWidth(); 644 Align = Target.getWCharAlign(); 645 break; 646 case BuiltinType::Char16: 647 Width = Target.getChar16Width(); 648 Align = Target.getChar16Align(); 649 break; 650 case BuiltinType::Char32: 651 Width = Target.getChar32Width(); 652 Align = Target.getChar32Align(); 653 break; 654 case BuiltinType::UShort: 655 case BuiltinType::Short: 656 Width = Target.getShortWidth(); 657 Align = Target.getShortAlign(); 658 break; 659 case BuiltinType::UInt: 660 case BuiltinType::Int: 661 Width = Target.getIntWidth(); 662 Align = Target.getIntAlign(); 663 break; 664 case BuiltinType::ULong: 665 case BuiltinType::Long: 666 Width = Target.getLongWidth(); 667 Align = Target.getLongAlign(); 668 break; 669 case BuiltinType::ULongLong: 670 case BuiltinType::LongLong: 671 Width = Target.getLongLongWidth(); 672 Align = Target.getLongLongAlign(); 673 break; 674 case BuiltinType::Int128: 675 case BuiltinType::UInt128: 676 Width = 128; 677 Align = 128; // int128_t is 128-bit aligned on all targets. 678 break; 679 case BuiltinType::Float: 680 Width = Target.getFloatWidth(); 681 Align = Target.getFloatAlign(); 682 break; 683 case BuiltinType::Double: 684 Width = Target.getDoubleWidth(); 685 Align = Target.getDoubleAlign(); 686 break; 687 case BuiltinType::LongDouble: 688 Width = Target.getLongDoubleWidth(); 689 Align = Target.getLongDoubleAlign(); 690 break; 691 case BuiltinType::NullPtr: 692 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 693 Align = Target.getPointerAlign(0); // == sizeof(void*) 694 break; 695 } 696 break; 697 case Type::FixedWidthInt: 698 // FIXME: This isn't precisely correct; the width/alignment should depend 699 // on the available types for the target 700 Width = cast<FixedWidthIntType>(T)->getWidth(); 701 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 702 Align = Width; 703 break; 704 case Type::ObjCObjectPointer: 705 Width = Target.getPointerWidth(0); 706 Align = Target.getPointerAlign(0); 707 break; 708 case Type::BlockPointer: { 709 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 710 Width = Target.getPointerWidth(AS); 711 Align = Target.getPointerAlign(AS); 712 break; 713 } 714 case Type::LValueReference: 715 case Type::RValueReference: { 716 // alignof and sizeof should never enter this code path here, so we go 717 // the pointer route. 718 unsigned AS = cast<ReferenceType>(T)->getPointeeType().getAddressSpace(); 719 Width = Target.getPointerWidth(AS); 720 Align = Target.getPointerAlign(AS); 721 break; 722 } 723 case Type::Pointer: { 724 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 725 Width = Target.getPointerWidth(AS); 726 Align = Target.getPointerAlign(AS); 727 break; 728 } 729 case Type::MemberPointer: { 730 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 731 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 732 // If we ever want to support other ABIs this needs to be abstracted. 733 734 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 735 std::pair<uint64_t, unsigned> PtrDiffInfo = 736 getTypeInfo(getPointerDiffType()); 737 Width = PtrDiffInfo.first; 738 if (Pointee->isFunctionType()) 739 Width *= 2; 740 Align = PtrDiffInfo.second; 741 break; 742 } 743 case Type::Complex: { 744 // Complex types have the same alignment as their elements, but twice the 745 // size. 746 std::pair<uint64_t, unsigned> EltInfo = 747 getTypeInfo(cast<ComplexType>(T)->getElementType()); 748 Width = EltInfo.first*2; 749 Align = EltInfo.second; 750 break; 751 } 752 case Type::ObjCInterface: { 753 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 754 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 755 Width = Layout.getSize(); 756 Align = Layout.getAlignment(); 757 break; 758 } 759 case Type::Record: 760 case Type::Enum: { 761 const TagType *TT = cast<TagType>(T); 762 763 if (TT->getDecl()->isInvalidDecl()) { 764 Width = 1; 765 Align = 1; 766 break; 767 } 768 769 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 770 return getTypeInfo(ET->getDecl()->getIntegerType()); 771 772 const RecordType *RT = cast<RecordType>(TT); 773 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 774 Width = Layout.getSize(); 775 Align = Layout.getAlignment(); 776 break; 777 } 778 779 case Type::SubstTemplateTypeParm: 780 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 781 getReplacementType().getTypePtr()); 782 783 case Type::Elaborated: 784 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType() 785 .getTypePtr()); 786 787 case Type::Typedef: { 788 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 789 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 790 Align = std::max(Aligned->getMaxAlignment(), 791 getTypeAlign(Typedef->getUnderlyingType().getTypePtr())); 792 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 793 } else 794 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 795 break; 796 } 797 798 case Type::TypeOfExpr: 799 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 800 .getTypePtr()); 801 802 case Type::TypeOf: 803 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 804 805 case Type::Decltype: 806 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 807 .getTypePtr()); 808 809 case Type::QualifiedName: 810 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 811 812 case Type::TemplateSpecialization: 813 assert(getCanonicalType(T) != T && 814 "Cannot request the size of a dependent type"); 815 // FIXME: this is likely to be wrong once we support template 816 // aliases, since a template alias could refer to a typedef that 817 // has an __aligned__ attribute on it. 818 return getTypeInfo(getCanonicalType(T)); 819 } 820 821 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 822 return std::make_pair(Width, Align); 823} 824 825/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 826/// type for the current target in bits. This can be different than the ABI 827/// alignment in cases where it is beneficial for performance to overalign 828/// a data type. 829unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 830 unsigned ABIAlign = getTypeAlign(T); 831 832 // Double and long long should be naturally aligned if possible. 833 if (const ComplexType* CT = T->getAs<ComplexType>()) 834 T = CT->getElementType().getTypePtr(); 835 if (T->isSpecificBuiltinType(BuiltinType::Double) || 836 T->isSpecificBuiltinType(BuiltinType::LongLong)) 837 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 838 839 return ABIAlign; 840} 841 842static void CollectLocalObjCIvars(ASTContext *Ctx, 843 const ObjCInterfaceDecl *OI, 844 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 845 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 846 E = OI->ivar_end(); I != E; ++I) { 847 ObjCIvarDecl *IVDecl = *I; 848 if (!IVDecl->isInvalidDecl()) 849 Fields.push_back(cast<FieldDecl>(IVDecl)); 850 } 851} 852 853void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 854 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 855 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 856 CollectObjCIvars(SuperClass, Fields); 857 CollectLocalObjCIvars(this, OI, Fields); 858} 859 860/// ShallowCollectObjCIvars - 861/// Collect all ivars, including those synthesized, in the current class. 862/// 863void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 864 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 865 bool CollectSynthesized) { 866 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 867 E = OI->ivar_end(); I != E; ++I) { 868 Ivars.push_back(*I); 869 } 870 if (CollectSynthesized) 871 CollectSynthesizedIvars(OI, Ivars); 872} 873 874void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 875 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 876 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 877 E = PD->prop_end(); I != E; ++I) 878 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 879 Ivars.push_back(Ivar); 880 881 // Also look into nested protocols. 882 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 883 E = PD->protocol_end(); P != E; ++P) 884 CollectProtocolSynthesizedIvars(*P, Ivars); 885} 886 887/// CollectSynthesizedIvars - 888/// This routine collect synthesized ivars for the designated class. 889/// 890void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 891 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 892 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 893 E = OI->prop_end(); I != E; ++I) { 894 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 895 Ivars.push_back(Ivar); 896 } 897 // Also look into interface's protocol list for properties declared 898 // in the protocol and whose ivars are synthesized. 899 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 900 PE = OI->protocol_end(); P != PE; ++P) { 901 ObjCProtocolDecl *PD = (*P); 902 CollectProtocolSynthesizedIvars(PD, Ivars); 903 } 904} 905 906/// CollectInheritedProtocols - Collect all protocols in current class and 907/// those inherited by it. 908void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 909 llvm::SmallVectorImpl<ObjCProtocolDecl*> &Protocols) { 910 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 911 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 912 PE = OI->protocol_end(); P != PE; ++P) { 913 ObjCProtocolDecl *Proto = (*P); 914 Protocols.push_back(Proto); 915 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 916 PE = Proto->protocol_end(); P != PE; ++P) 917 CollectInheritedProtocols(*P, Protocols); 918 } 919 920 // Categories of this Interface. 921 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 922 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 923 CollectInheritedProtocols(CDeclChain, Protocols); 924 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 925 while (SD) { 926 CollectInheritedProtocols(SD, Protocols); 927 SD = SD->getSuperClass(); 928 } 929 return; 930 } 931 if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 932 for (ObjCInterfaceDecl::protocol_iterator P = OC->protocol_begin(), 933 PE = OC->protocol_end(); P != PE; ++P) { 934 ObjCProtocolDecl *Proto = (*P); 935 Protocols.push_back(Proto); 936 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 937 PE = Proto->protocol_end(); P != PE; ++P) 938 CollectInheritedProtocols(*P, Protocols); 939 } 940 return; 941 } 942 if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 943 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 944 PE = OP->protocol_end(); P != PE; ++P) { 945 ObjCProtocolDecl *Proto = (*P); 946 Protocols.push_back(Proto); 947 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 948 PE = Proto->protocol_end(); P != PE; ++P) 949 CollectInheritedProtocols(*P, Protocols); 950 } 951 return; 952 } 953} 954 955unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 956 unsigned count = 0; 957 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 958 E = PD->prop_end(); I != E; ++I) 959 if ((*I)->getPropertyIvarDecl()) 960 ++count; 961 962 // Also look into nested protocols. 963 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 964 E = PD->protocol_end(); P != E; ++P) 965 count += CountProtocolSynthesizedIvars(*P); 966 return count; 967} 968 969unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) { 970 unsigned count = 0; 971 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 972 E = OI->prop_end(); I != E; ++I) { 973 if ((*I)->getPropertyIvarDecl()) 974 ++count; 975 } 976 // Also look into interface's protocol list for properties declared 977 // in the protocol and whose ivars are synthesized. 978 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 979 PE = OI->protocol_end(); P != PE; ++P) { 980 ObjCProtocolDecl *PD = (*P); 981 count += CountProtocolSynthesizedIvars(PD); 982 } 983 return count; 984} 985 986/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 987ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 988 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 989 I = ObjCImpls.find(D); 990 if (I != ObjCImpls.end()) 991 return cast<ObjCImplementationDecl>(I->second); 992 return 0; 993} 994/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 995ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 996 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 997 I = ObjCImpls.find(D); 998 if (I != ObjCImpls.end()) 999 return cast<ObjCCategoryImplDecl>(I->second); 1000 return 0; 1001} 1002 1003/// \brief Set the implementation of ObjCInterfaceDecl. 1004void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 1005 ObjCImplementationDecl *ImplD) { 1006 assert(IFaceD && ImplD && "Passed null params"); 1007 ObjCImpls[IFaceD] = ImplD; 1008} 1009/// \brief Set the implementation of ObjCCategoryDecl. 1010void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 1011 ObjCCategoryImplDecl *ImplD) { 1012 assert(CatD && ImplD && "Passed null params"); 1013 ObjCImpls[CatD] = ImplD; 1014} 1015 1016/// \brief Allocate an uninitialized DeclaratorInfo. 1017/// 1018/// The caller should initialize the memory held by DeclaratorInfo using 1019/// the TypeLoc wrappers. 1020/// 1021/// \param T the type that will be the basis for type source info. This type 1022/// should refer to how the declarator was written in source code, not to 1023/// what type semantic analysis resolved the declarator to. 1024DeclaratorInfo *ASTContext::CreateDeclaratorInfo(QualType T, 1025 unsigned DataSize) { 1026 if (!DataSize) 1027 DataSize = TypeLoc::getFullDataSizeForType(T); 1028 else 1029 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 1030 "incorrect data size provided to CreateDeclaratorInfo!"); 1031 1032 DeclaratorInfo *DInfo = 1033 (DeclaratorInfo*)BumpAlloc.Allocate(sizeof(DeclaratorInfo) + DataSize, 8); 1034 new (DInfo) DeclaratorInfo(T); 1035 return DInfo; 1036} 1037 1038DeclaratorInfo *ASTContext::getTrivialDeclaratorInfo(QualType T, 1039 SourceLocation L) { 1040 DeclaratorInfo *DI = CreateDeclaratorInfo(T); 1041 DI->getTypeLoc().initialize(L); 1042 return DI; 1043} 1044 1045/// getInterfaceLayoutImpl - Get or compute information about the 1046/// layout of the given interface. 1047/// 1048/// \param Impl - If given, also include the layout of the interface's 1049/// implementation. This may differ by including synthesized ivars. 1050const ASTRecordLayout & 1051ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 1052 const ObjCImplementationDecl *Impl) { 1053 assert(!D->isForwardDecl() && "Invalid interface decl!"); 1054 1055 // Look up this layout, if already laid out, return what we have. 1056 ObjCContainerDecl *Key = 1057 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 1058 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 1059 return *Entry; 1060 1061 // Add in synthesized ivar count if laying out an implementation. 1062 if (Impl) { 1063 unsigned FieldCount = D->ivar_size(); 1064 unsigned SynthCount = CountSynthesizedIvars(D); 1065 FieldCount += SynthCount; 1066 // If there aren't any sythesized ivars then reuse the interface 1067 // entry. Note we can't cache this because we simply free all 1068 // entries later; however we shouldn't look up implementations 1069 // frequently. 1070 if (SynthCount == 0) 1071 return getObjCLayout(D, 0); 1072 } 1073 1074 const ASTRecordLayout *NewEntry = 1075 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 1076 ObjCLayouts[Key] = NewEntry; 1077 1078 return *NewEntry; 1079} 1080 1081const ASTRecordLayout & 1082ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 1083 return getObjCLayout(D, 0); 1084} 1085 1086const ASTRecordLayout & 1087ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 1088 return getObjCLayout(D->getClassInterface(), D); 1089} 1090 1091/// getASTRecordLayout - Get or compute information about the layout of the 1092/// specified record (struct/union/class), which indicates its size and field 1093/// position information. 1094const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 1095 D = D->getDefinition(*this); 1096 assert(D && "Cannot get layout of forward declarations!"); 1097 1098 // Look up this layout, if already laid out, return what we have. 1099 // Note that we can't save a reference to the entry because this function 1100 // is recursive. 1101 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 1102 if (Entry) return *Entry; 1103 1104 const ASTRecordLayout *NewEntry = 1105 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 1106 ASTRecordLayouts[D] = NewEntry; 1107 1108 return *NewEntry; 1109} 1110 1111//===----------------------------------------------------------------------===// 1112// Type creation/memoization methods 1113//===----------------------------------------------------------------------===// 1114 1115QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1116 unsigned Fast = Quals.getFastQualifiers(); 1117 Quals.removeFastQualifiers(); 1118 1119 // Check if we've already instantiated this type. 1120 llvm::FoldingSetNodeID ID; 1121 ExtQuals::Profile(ID, TypeNode, Quals); 1122 void *InsertPos = 0; 1123 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1124 assert(EQ->getQualifiers() == Quals); 1125 QualType T = QualType(EQ, Fast); 1126 return T; 1127 } 1128 1129 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1130 ExtQualNodes.InsertNode(New, InsertPos); 1131 QualType T = QualType(New, Fast); 1132 return T; 1133} 1134 1135QualType ASTContext::getVolatileType(QualType T) { 1136 QualType CanT = getCanonicalType(T); 1137 if (CanT.isVolatileQualified()) return T; 1138 1139 QualifierCollector Quals; 1140 const Type *TypeNode = Quals.strip(T); 1141 Quals.addVolatile(); 1142 1143 return getExtQualType(TypeNode, Quals); 1144} 1145 1146QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1147 QualType CanT = getCanonicalType(T); 1148 if (CanT.getAddressSpace() == AddressSpace) 1149 return T; 1150 1151 // If we are composing extended qualifiers together, merge together 1152 // into one ExtQuals node. 1153 QualifierCollector Quals; 1154 const Type *TypeNode = Quals.strip(T); 1155 1156 // If this type already has an address space specified, it cannot get 1157 // another one. 1158 assert(!Quals.hasAddressSpace() && 1159 "Type cannot be in multiple addr spaces!"); 1160 Quals.addAddressSpace(AddressSpace); 1161 1162 return getExtQualType(TypeNode, Quals); 1163} 1164 1165QualType ASTContext::getObjCGCQualType(QualType T, 1166 Qualifiers::GC GCAttr) { 1167 QualType CanT = getCanonicalType(T); 1168 if (CanT.getObjCGCAttr() == GCAttr) 1169 return T; 1170 1171 if (T->isPointerType()) { 1172 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1173 if (Pointee->isAnyPointerType()) { 1174 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1175 return getPointerType(ResultType); 1176 } 1177 } 1178 1179 // If we are composing extended qualifiers together, merge together 1180 // into one ExtQuals node. 1181 QualifierCollector Quals; 1182 const Type *TypeNode = Quals.strip(T); 1183 1184 // If this type already has an ObjCGC specified, it cannot get 1185 // another one. 1186 assert(!Quals.hasObjCGCAttr() && 1187 "Type cannot have multiple ObjCGCs!"); 1188 Quals.addObjCGCAttr(GCAttr); 1189 1190 return getExtQualType(TypeNode, Quals); 1191} 1192 1193QualType ASTContext::getNoReturnType(QualType T) { 1194 QualType ResultType; 1195 if (T->isPointerType()) { 1196 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1197 ResultType = getNoReturnType(Pointee); 1198 ResultType = getPointerType(ResultType); 1199 } else if (T->isBlockPointerType()) { 1200 QualType Pointee = T->getAs<BlockPointerType>()->getPointeeType(); 1201 ResultType = getNoReturnType(Pointee); 1202 ResultType = getBlockPointerType(ResultType); 1203 } else { 1204 assert (T->isFunctionType() 1205 && "can't noreturn qualify non-pointer to function or block type"); 1206 1207 if (const FunctionNoProtoType *FNPT = T->getAs<FunctionNoProtoType>()) { 1208 ResultType = getFunctionNoProtoType(FNPT->getResultType(), true); 1209 } else { 1210 const FunctionProtoType *F = T->getAs<FunctionProtoType>(); 1211 ResultType 1212 = getFunctionType(F->getResultType(), F->arg_type_begin(), 1213 F->getNumArgs(), F->isVariadic(), F->getTypeQuals(), 1214 F->hasExceptionSpec(), F->hasAnyExceptionSpec(), 1215 F->getNumExceptions(), F->exception_begin(), true); 1216 } 1217 } 1218 1219 return getQualifiedType(ResultType, T.getLocalQualifiers()); 1220} 1221 1222/// getComplexType - Return the uniqued reference to the type for a complex 1223/// number with the specified element type. 1224QualType ASTContext::getComplexType(QualType T) { 1225 // Unique pointers, to guarantee there is only one pointer of a particular 1226 // structure. 1227 llvm::FoldingSetNodeID ID; 1228 ComplexType::Profile(ID, T); 1229 1230 void *InsertPos = 0; 1231 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1232 return QualType(CT, 0); 1233 1234 // If the pointee type isn't canonical, this won't be a canonical type either, 1235 // so fill in the canonical type field. 1236 QualType Canonical; 1237 if (!T.isCanonical()) { 1238 Canonical = getComplexType(getCanonicalType(T)); 1239 1240 // Get the new insert position for the node we care about. 1241 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1242 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1243 } 1244 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1245 Types.push_back(New); 1246 ComplexTypes.InsertNode(New, InsertPos); 1247 return QualType(New, 0); 1248} 1249 1250QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1251 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1252 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1253 FixedWidthIntType *&Entry = Map[Width]; 1254 if (!Entry) 1255 Entry = new FixedWidthIntType(Width, Signed); 1256 return QualType(Entry, 0); 1257} 1258 1259/// getPointerType - Return the uniqued reference to the type for a pointer to 1260/// the specified type. 1261QualType ASTContext::getPointerType(QualType T) { 1262 // Unique pointers, to guarantee there is only one pointer of a particular 1263 // structure. 1264 llvm::FoldingSetNodeID ID; 1265 PointerType::Profile(ID, T); 1266 1267 void *InsertPos = 0; 1268 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1269 return QualType(PT, 0); 1270 1271 // If the pointee type isn't canonical, this won't be a canonical type either, 1272 // so fill in the canonical type field. 1273 QualType Canonical; 1274 if (!T.isCanonical()) { 1275 Canonical = getPointerType(getCanonicalType(T)); 1276 1277 // Get the new insert position for the node we care about. 1278 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1279 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1280 } 1281 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1282 Types.push_back(New); 1283 PointerTypes.InsertNode(New, InsertPos); 1284 return QualType(New, 0); 1285} 1286 1287/// getBlockPointerType - Return the uniqued reference to the type for 1288/// a pointer to the specified block. 1289QualType ASTContext::getBlockPointerType(QualType T) { 1290 assert(T->isFunctionType() && "block of function types only"); 1291 // Unique pointers, to guarantee there is only one block of a particular 1292 // structure. 1293 llvm::FoldingSetNodeID ID; 1294 BlockPointerType::Profile(ID, T); 1295 1296 void *InsertPos = 0; 1297 if (BlockPointerType *PT = 1298 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1299 return QualType(PT, 0); 1300 1301 // If the block pointee type isn't canonical, this won't be a canonical 1302 // type either so fill in the canonical type field. 1303 QualType Canonical; 1304 if (!T.isCanonical()) { 1305 Canonical = getBlockPointerType(getCanonicalType(T)); 1306 1307 // Get the new insert position for the node we care about. 1308 BlockPointerType *NewIP = 1309 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1310 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1311 } 1312 BlockPointerType *New 1313 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1314 Types.push_back(New); 1315 BlockPointerTypes.InsertNode(New, InsertPos); 1316 return QualType(New, 0); 1317} 1318 1319/// getLValueReferenceType - Return the uniqued reference to the type for an 1320/// lvalue reference to the specified type. 1321QualType ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) { 1322 // Unique pointers, to guarantee there is only one pointer of a particular 1323 // structure. 1324 llvm::FoldingSetNodeID ID; 1325 ReferenceType::Profile(ID, T, SpelledAsLValue); 1326 1327 void *InsertPos = 0; 1328 if (LValueReferenceType *RT = 1329 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1330 return QualType(RT, 0); 1331 1332 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1333 1334 // If the referencee type isn't canonical, this won't be a canonical type 1335 // either, so fill in the canonical type field. 1336 QualType Canonical; 1337 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1338 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1339 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1340 1341 // Get the new insert position for the node we care about. 1342 LValueReferenceType *NewIP = 1343 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1344 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1345 } 1346 1347 LValueReferenceType *New 1348 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1349 SpelledAsLValue); 1350 Types.push_back(New); 1351 LValueReferenceTypes.InsertNode(New, InsertPos); 1352 1353 return QualType(New, 0); 1354} 1355 1356/// getRValueReferenceType - Return the uniqued reference to the type for an 1357/// rvalue reference to the specified type. 1358QualType ASTContext::getRValueReferenceType(QualType T) { 1359 // Unique pointers, to guarantee there is only one pointer of a particular 1360 // structure. 1361 llvm::FoldingSetNodeID ID; 1362 ReferenceType::Profile(ID, T, false); 1363 1364 void *InsertPos = 0; 1365 if (RValueReferenceType *RT = 1366 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1367 return QualType(RT, 0); 1368 1369 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1370 1371 // If the referencee type isn't canonical, this won't be a canonical type 1372 // either, so fill in the canonical type field. 1373 QualType Canonical; 1374 if (InnerRef || !T.isCanonical()) { 1375 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1376 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1377 1378 // Get the new insert position for the node we care about. 1379 RValueReferenceType *NewIP = 1380 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1381 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1382 } 1383 1384 RValueReferenceType *New 1385 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1386 Types.push_back(New); 1387 RValueReferenceTypes.InsertNode(New, InsertPos); 1388 return QualType(New, 0); 1389} 1390 1391/// getMemberPointerType - Return the uniqued reference to the type for a 1392/// member pointer to the specified type, in the specified class. 1393QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1394 // Unique pointers, to guarantee there is only one pointer of a particular 1395 // structure. 1396 llvm::FoldingSetNodeID ID; 1397 MemberPointerType::Profile(ID, T, Cls); 1398 1399 void *InsertPos = 0; 1400 if (MemberPointerType *PT = 1401 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1402 return QualType(PT, 0); 1403 1404 // If the pointee or class type isn't canonical, this won't be a canonical 1405 // type either, so fill in the canonical type field. 1406 QualType Canonical; 1407 if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) { 1408 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1409 1410 // Get the new insert position for the node we care about. 1411 MemberPointerType *NewIP = 1412 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1413 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1414 } 1415 MemberPointerType *New 1416 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1417 Types.push_back(New); 1418 MemberPointerTypes.InsertNode(New, InsertPos); 1419 return QualType(New, 0); 1420} 1421 1422/// getConstantArrayType - Return the unique reference to the type for an 1423/// array of the specified element type. 1424QualType ASTContext::getConstantArrayType(QualType EltTy, 1425 const llvm::APInt &ArySizeIn, 1426 ArrayType::ArraySizeModifier ASM, 1427 unsigned EltTypeQuals) { 1428 assert((EltTy->isDependentType() || 1429 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1430 "Constant array of VLAs is illegal!"); 1431 1432 // Convert the array size into a canonical width matching the pointer size for 1433 // the target. 1434 llvm::APInt ArySize(ArySizeIn); 1435 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1436 1437 llvm::FoldingSetNodeID ID; 1438 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1439 1440 void *InsertPos = 0; 1441 if (ConstantArrayType *ATP = 1442 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1443 return QualType(ATP, 0); 1444 1445 // If the element type isn't canonical, this won't be a canonical type either, 1446 // so fill in the canonical type field. 1447 QualType Canonical; 1448 if (!EltTy.isCanonical()) { 1449 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1450 ASM, EltTypeQuals); 1451 // Get the new insert position for the node we care about. 1452 ConstantArrayType *NewIP = 1453 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1454 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1455 } 1456 1457 ConstantArrayType *New = new(*this,TypeAlignment) 1458 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1459 ConstantArrayTypes.InsertNode(New, InsertPos); 1460 Types.push_back(New); 1461 return QualType(New, 0); 1462} 1463 1464/// getVariableArrayType - Returns a non-unique reference to the type for a 1465/// variable array of the specified element type. 1466QualType ASTContext::getVariableArrayType(QualType EltTy, 1467 Expr *NumElts, 1468 ArrayType::ArraySizeModifier ASM, 1469 unsigned EltTypeQuals, 1470 SourceRange Brackets) { 1471 // Since we don't unique expressions, it isn't possible to unique VLA's 1472 // that have an expression provided for their size. 1473 1474 VariableArrayType *New = new(*this, TypeAlignment) 1475 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1476 1477 VariableArrayTypes.push_back(New); 1478 Types.push_back(New); 1479 return QualType(New, 0); 1480} 1481 1482/// getDependentSizedArrayType - Returns a non-unique reference to 1483/// the type for a dependently-sized array of the specified element 1484/// type. 1485QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1486 Expr *NumElts, 1487 ArrayType::ArraySizeModifier ASM, 1488 unsigned EltTypeQuals, 1489 SourceRange Brackets) { 1490 assert((!NumElts || NumElts->isTypeDependent() || 1491 NumElts->isValueDependent()) && 1492 "Size must be type- or value-dependent!"); 1493 1494 void *InsertPos = 0; 1495 DependentSizedArrayType *Canon = 0; 1496 1497 if (NumElts) { 1498 // Dependently-sized array types that do not have a specified 1499 // number of elements will have their sizes deduced from an 1500 // initializer. 1501 llvm::FoldingSetNodeID ID; 1502 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1503 EltTypeQuals, NumElts); 1504 1505 Canon = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1506 } 1507 1508 DependentSizedArrayType *New; 1509 if (Canon) { 1510 // We already have a canonical version of this array type; use it as 1511 // the canonical type for a newly-built type. 1512 New = new (*this, TypeAlignment) 1513 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1514 NumElts, ASM, EltTypeQuals, Brackets); 1515 } else { 1516 QualType CanonEltTy = getCanonicalType(EltTy); 1517 if (CanonEltTy == EltTy) { 1518 New = new (*this, TypeAlignment) 1519 DependentSizedArrayType(*this, EltTy, QualType(), 1520 NumElts, ASM, EltTypeQuals, Brackets); 1521 1522 if (NumElts) 1523 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1524 } else { 1525 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1526 ASM, EltTypeQuals, 1527 SourceRange()); 1528 New = new (*this, TypeAlignment) 1529 DependentSizedArrayType(*this, EltTy, Canon, 1530 NumElts, ASM, EltTypeQuals, Brackets); 1531 } 1532 } 1533 1534 Types.push_back(New); 1535 return QualType(New, 0); 1536} 1537 1538QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1539 ArrayType::ArraySizeModifier ASM, 1540 unsigned EltTypeQuals) { 1541 llvm::FoldingSetNodeID ID; 1542 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1543 1544 void *InsertPos = 0; 1545 if (IncompleteArrayType *ATP = 1546 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1547 return QualType(ATP, 0); 1548 1549 // If the element type isn't canonical, this won't be a canonical type 1550 // either, so fill in the canonical type field. 1551 QualType Canonical; 1552 1553 if (!EltTy.isCanonical()) { 1554 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1555 ASM, EltTypeQuals); 1556 1557 // Get the new insert position for the node we care about. 1558 IncompleteArrayType *NewIP = 1559 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1560 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1561 } 1562 1563 IncompleteArrayType *New = new (*this, TypeAlignment) 1564 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1565 1566 IncompleteArrayTypes.InsertNode(New, InsertPos); 1567 Types.push_back(New); 1568 return QualType(New, 0); 1569} 1570 1571/// getVectorType - Return the unique reference to a vector type of 1572/// the specified element type and size. VectorType must be a built-in type. 1573QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1574 BuiltinType *baseType; 1575 1576 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1577 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1578 1579 // Check if we've already instantiated a vector of this type. 1580 llvm::FoldingSetNodeID ID; 1581 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1582 void *InsertPos = 0; 1583 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1584 return QualType(VTP, 0); 1585 1586 // If the element type isn't canonical, this won't be a canonical type either, 1587 // so fill in the canonical type field. 1588 QualType Canonical; 1589 if (!vecType.isCanonical()) { 1590 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1591 1592 // Get the new insert position for the node we care about. 1593 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1594 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1595 } 1596 VectorType *New = new (*this, TypeAlignment) 1597 VectorType(vecType, NumElts, Canonical); 1598 VectorTypes.InsertNode(New, InsertPos); 1599 Types.push_back(New); 1600 return QualType(New, 0); 1601} 1602 1603/// getExtVectorType - Return the unique reference to an extended vector type of 1604/// the specified element type and size. VectorType must be a built-in type. 1605QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1606 BuiltinType *baseType; 1607 1608 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1609 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1610 1611 // Check if we've already instantiated a vector of this type. 1612 llvm::FoldingSetNodeID ID; 1613 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1614 void *InsertPos = 0; 1615 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1616 return QualType(VTP, 0); 1617 1618 // If the element type isn't canonical, this won't be a canonical type either, 1619 // so fill in the canonical type field. 1620 QualType Canonical; 1621 if (!vecType.isCanonical()) { 1622 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1623 1624 // Get the new insert position for the node we care about. 1625 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1626 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1627 } 1628 ExtVectorType *New = new (*this, TypeAlignment) 1629 ExtVectorType(vecType, NumElts, Canonical); 1630 VectorTypes.InsertNode(New, InsertPos); 1631 Types.push_back(New); 1632 return QualType(New, 0); 1633} 1634 1635QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1636 Expr *SizeExpr, 1637 SourceLocation AttrLoc) { 1638 llvm::FoldingSetNodeID ID; 1639 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1640 SizeExpr); 1641 1642 void *InsertPos = 0; 1643 DependentSizedExtVectorType *Canon 1644 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1645 DependentSizedExtVectorType *New; 1646 if (Canon) { 1647 // We already have a canonical version of this array type; use it as 1648 // the canonical type for a newly-built type. 1649 New = new (*this, TypeAlignment) 1650 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1651 SizeExpr, AttrLoc); 1652 } else { 1653 QualType CanonVecTy = getCanonicalType(vecType); 1654 if (CanonVecTy == vecType) { 1655 New = new (*this, TypeAlignment) 1656 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1657 AttrLoc); 1658 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1659 } else { 1660 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1661 SourceLocation()); 1662 New = new (*this, TypeAlignment) 1663 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1664 } 1665 } 1666 1667 Types.push_back(New); 1668 return QualType(New, 0); 1669} 1670 1671/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1672/// 1673QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1674 // Unique functions, to guarantee there is only one function of a particular 1675 // structure. 1676 llvm::FoldingSetNodeID ID; 1677 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1678 1679 void *InsertPos = 0; 1680 if (FunctionNoProtoType *FT = 1681 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1682 return QualType(FT, 0); 1683 1684 QualType Canonical; 1685 if (!ResultTy.isCanonical()) { 1686 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1687 1688 // Get the new insert position for the node we care about. 1689 FunctionNoProtoType *NewIP = 1690 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1691 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1692 } 1693 1694 FunctionNoProtoType *New = new (*this, TypeAlignment) 1695 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1696 Types.push_back(New); 1697 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1698 return QualType(New, 0); 1699} 1700 1701/// getFunctionType - Return a normal function type with a typed argument 1702/// list. isVariadic indicates whether the argument list includes '...'. 1703QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1704 unsigned NumArgs, bool isVariadic, 1705 unsigned TypeQuals, bool hasExceptionSpec, 1706 bool hasAnyExceptionSpec, unsigned NumExs, 1707 const QualType *ExArray, bool NoReturn) { 1708 // Unique functions, to guarantee there is only one function of a particular 1709 // structure. 1710 llvm::FoldingSetNodeID ID; 1711 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1712 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1713 NumExs, ExArray, NoReturn); 1714 1715 void *InsertPos = 0; 1716 if (FunctionProtoType *FTP = 1717 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1718 return QualType(FTP, 0); 1719 1720 // Determine whether the type being created is already canonical or not. 1721 bool isCanonical = !hasExceptionSpec && ResultTy.isCanonical(); 1722 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1723 if (!ArgArray[i].isCanonicalAsParam()) 1724 isCanonical = false; 1725 1726 // If this type isn't canonical, get the canonical version of it. 1727 // The exception spec is not part of the canonical type. 1728 QualType Canonical; 1729 if (!isCanonical) { 1730 llvm::SmallVector<QualType, 16> CanonicalArgs; 1731 CanonicalArgs.reserve(NumArgs); 1732 for (unsigned i = 0; i != NumArgs; ++i) 1733 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1734 1735 Canonical = getFunctionType(getCanonicalType(ResultTy), 1736 CanonicalArgs.data(), NumArgs, 1737 isVariadic, TypeQuals, false, 1738 false, 0, 0, NoReturn); 1739 1740 // Get the new insert position for the node we care about. 1741 FunctionProtoType *NewIP = 1742 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1743 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1744 } 1745 1746 // FunctionProtoType objects are allocated with extra bytes after them 1747 // for two variable size arrays (for parameter and exception types) at the 1748 // end of them. 1749 FunctionProtoType *FTP = 1750 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1751 NumArgs*sizeof(QualType) + 1752 NumExs*sizeof(QualType), TypeAlignment); 1753 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1754 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1755 ExArray, NumExs, Canonical, NoReturn); 1756 Types.push_back(FTP); 1757 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1758 return QualType(FTP, 0); 1759} 1760 1761/// getTypeDeclType - Return the unique reference to the type for the 1762/// specified type declaration. 1763QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1764 assert(Decl && "Passed null for Decl param"); 1765 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1766 1767 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1768 return getTypedefType(Typedef); 1769 else if (isa<TemplateTypeParmDecl>(Decl)) { 1770 assert(false && "Template type parameter types are always available."); 1771 } else if (ObjCInterfaceDecl *ObjCInterface 1772 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1773 return getObjCInterfaceType(ObjCInterface); 1774 1775 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1776 if (PrevDecl) 1777 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1778 else 1779 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1780 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1781 if (PrevDecl) 1782 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1783 else 1784 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1785 } else if (UnresolvedUsingTypenameDecl *Using = 1786 dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) { 1787 Decl->TypeForDecl = new (*this, TypeAlignment) UnresolvedUsingType(Using); 1788 } else 1789 assert(false && "TypeDecl without a type?"); 1790 1791 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1792 return QualType(Decl->TypeForDecl, 0); 1793} 1794 1795/// getTypedefType - Return the unique reference to the type for the 1796/// specified typename decl. 1797QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1798 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1799 1800 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1801 Decl->TypeForDecl = new(*this, TypeAlignment) 1802 TypedefType(Type::Typedef, Decl, Canonical); 1803 Types.push_back(Decl->TypeForDecl); 1804 return QualType(Decl->TypeForDecl, 0); 1805} 1806 1807/// \brief Retrieve a substitution-result type. 1808QualType 1809ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1810 QualType Replacement) { 1811 assert(Replacement.isCanonical() 1812 && "replacement types must always be canonical"); 1813 1814 llvm::FoldingSetNodeID ID; 1815 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1816 void *InsertPos = 0; 1817 SubstTemplateTypeParmType *SubstParm 1818 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1819 1820 if (!SubstParm) { 1821 SubstParm = new (*this, TypeAlignment) 1822 SubstTemplateTypeParmType(Parm, Replacement); 1823 Types.push_back(SubstParm); 1824 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1825 } 1826 1827 return QualType(SubstParm, 0); 1828} 1829 1830/// \brief Retrieve the template type parameter type for a template 1831/// parameter or parameter pack with the given depth, index, and (optionally) 1832/// name. 1833QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1834 bool ParameterPack, 1835 IdentifierInfo *Name) { 1836 llvm::FoldingSetNodeID ID; 1837 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1838 void *InsertPos = 0; 1839 TemplateTypeParmType *TypeParm 1840 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1841 1842 if (TypeParm) 1843 return QualType(TypeParm, 0); 1844 1845 if (Name) { 1846 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1847 TypeParm = new (*this, TypeAlignment) 1848 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1849 } else 1850 TypeParm = new (*this, TypeAlignment) 1851 TemplateTypeParmType(Depth, Index, ParameterPack); 1852 1853 Types.push_back(TypeParm); 1854 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1855 1856 return QualType(TypeParm, 0); 1857} 1858 1859QualType 1860ASTContext::getTemplateSpecializationType(TemplateName Template, 1861 const TemplateArgumentListInfo &Args, 1862 QualType Canon) { 1863 unsigned NumArgs = Args.size(); 1864 1865 llvm::SmallVector<TemplateArgument, 4> ArgVec; 1866 ArgVec.reserve(NumArgs); 1867 for (unsigned i = 0; i != NumArgs; ++i) 1868 ArgVec.push_back(Args[i].getArgument()); 1869 1870 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, Canon); 1871} 1872 1873QualType 1874ASTContext::getTemplateSpecializationType(TemplateName Template, 1875 const TemplateArgument *Args, 1876 unsigned NumArgs, 1877 QualType Canon) { 1878 if (!Canon.isNull()) 1879 Canon = getCanonicalType(Canon); 1880 else { 1881 // Build the canonical template specialization type. 1882 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1883 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1884 CanonArgs.reserve(NumArgs); 1885 for (unsigned I = 0; I != NumArgs; ++I) 1886 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1887 1888 // Determine whether this canonical template specialization type already 1889 // exists. 1890 llvm::FoldingSetNodeID ID; 1891 TemplateSpecializationType::Profile(ID, CanonTemplate, 1892 CanonArgs.data(), NumArgs, *this); 1893 1894 void *InsertPos = 0; 1895 TemplateSpecializationType *Spec 1896 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1897 1898 if (!Spec) { 1899 // Allocate a new canonical template specialization type. 1900 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1901 sizeof(TemplateArgument) * NumArgs), 1902 TypeAlignment); 1903 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1904 CanonArgs.data(), NumArgs, 1905 Canon); 1906 Types.push_back(Spec); 1907 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1908 } 1909 1910 if (Canon.isNull()) 1911 Canon = QualType(Spec, 0); 1912 assert(Canon->isDependentType() && 1913 "Non-dependent template-id type must have a canonical type"); 1914 } 1915 1916 // Allocate the (non-canonical) template specialization type, but don't 1917 // try to unique it: these types typically have location information that 1918 // we don't unique and don't want to lose. 1919 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1920 sizeof(TemplateArgument) * NumArgs), 1921 TypeAlignment); 1922 TemplateSpecializationType *Spec 1923 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1924 Canon); 1925 1926 Types.push_back(Spec); 1927 return QualType(Spec, 0); 1928} 1929 1930QualType 1931ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1932 QualType NamedType) { 1933 llvm::FoldingSetNodeID ID; 1934 QualifiedNameType::Profile(ID, NNS, NamedType); 1935 1936 void *InsertPos = 0; 1937 QualifiedNameType *T 1938 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1939 if (T) 1940 return QualType(T, 0); 1941 1942 T = new (*this) QualifiedNameType(NNS, NamedType, 1943 getCanonicalType(NamedType)); 1944 Types.push_back(T); 1945 QualifiedNameTypes.InsertNode(T, InsertPos); 1946 return QualType(T, 0); 1947} 1948 1949QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1950 const IdentifierInfo *Name, 1951 QualType Canon) { 1952 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1953 1954 if (Canon.isNull()) { 1955 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1956 if (CanonNNS != NNS) 1957 Canon = getTypenameType(CanonNNS, Name); 1958 } 1959 1960 llvm::FoldingSetNodeID ID; 1961 TypenameType::Profile(ID, NNS, Name); 1962 1963 void *InsertPos = 0; 1964 TypenameType *T 1965 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1966 if (T) 1967 return QualType(T, 0); 1968 1969 T = new (*this) TypenameType(NNS, Name, Canon); 1970 Types.push_back(T); 1971 TypenameTypes.InsertNode(T, InsertPos); 1972 return QualType(T, 0); 1973} 1974 1975QualType 1976ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1977 const TemplateSpecializationType *TemplateId, 1978 QualType Canon) { 1979 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1980 1981 if (Canon.isNull()) { 1982 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1983 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1984 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1985 const TemplateSpecializationType *CanonTemplateId 1986 = CanonType->getAs<TemplateSpecializationType>(); 1987 assert(CanonTemplateId && 1988 "Canonical type must also be a template specialization type"); 1989 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1990 } 1991 } 1992 1993 llvm::FoldingSetNodeID ID; 1994 TypenameType::Profile(ID, NNS, TemplateId); 1995 1996 void *InsertPos = 0; 1997 TypenameType *T 1998 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1999 if (T) 2000 return QualType(T, 0); 2001 2002 T = new (*this) TypenameType(NNS, TemplateId, Canon); 2003 Types.push_back(T); 2004 TypenameTypes.InsertNode(T, InsertPos); 2005 return QualType(T, 0); 2006} 2007 2008QualType 2009ASTContext::getElaboratedType(QualType UnderlyingType, 2010 ElaboratedType::TagKind Tag) { 2011 llvm::FoldingSetNodeID ID; 2012 ElaboratedType::Profile(ID, UnderlyingType, Tag); 2013 2014 void *InsertPos = 0; 2015 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2016 if (T) 2017 return QualType(T, 0); 2018 2019 QualType Canon = getCanonicalType(UnderlyingType); 2020 2021 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 2022 Types.push_back(T); 2023 ElaboratedTypes.InsertNode(T, InsertPos); 2024 return QualType(T, 0); 2025} 2026 2027/// CmpProtocolNames - Comparison predicate for sorting protocols 2028/// alphabetically. 2029static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 2030 const ObjCProtocolDecl *RHS) { 2031 return LHS->getDeclName() < RHS->getDeclName(); 2032} 2033 2034static bool areSortedAndUniqued(ObjCProtocolDecl **Protocols, 2035 unsigned NumProtocols) { 2036 if (NumProtocols == 0) return true; 2037 2038 for (unsigned i = 1; i != NumProtocols; ++i) 2039 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 2040 return false; 2041 return true; 2042} 2043 2044static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2045 unsigned &NumProtocols) { 2046 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2047 2048 // Sort protocols, keyed by name. 2049 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2050 2051 // Remove duplicates. 2052 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2053 NumProtocols = ProtocolsEnd-Protocols; 2054} 2055 2056/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2057/// the given interface decl and the conforming protocol list. 2058QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 2059 ObjCProtocolDecl **Protocols, 2060 unsigned NumProtocols) { 2061 llvm::FoldingSetNodeID ID; 2062 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 2063 2064 void *InsertPos = 0; 2065 if (ObjCObjectPointerType *QT = 2066 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2067 return QualType(QT, 0); 2068 2069 // Sort the protocol list alphabetically to canonicalize it. 2070 QualType Canonical; 2071 if (!InterfaceT.isCanonical() || 2072 !areSortedAndUniqued(Protocols, NumProtocols)) { 2073 if (!areSortedAndUniqued(Protocols, NumProtocols)) { 2074 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2075 unsigned UniqueCount = NumProtocols; 2076 2077 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2078 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2079 2080 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2081 &Sorted[0], UniqueCount); 2082 } else { 2083 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2084 Protocols, NumProtocols); 2085 } 2086 2087 // Regenerate InsertPos. 2088 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2089 } 2090 2091 // No Match; 2092 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 2093 ObjCObjectPointerType(Canonical, InterfaceT, Protocols, NumProtocols); 2094 2095 Types.push_back(QType); 2096 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2097 return QualType(QType, 0); 2098} 2099 2100/// getObjCInterfaceType - Return the unique reference to the type for the 2101/// specified ObjC interface decl. The list of protocols is optional. 2102QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 2103 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 2104 llvm::FoldingSetNodeID ID; 2105 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 2106 2107 void *InsertPos = 0; 2108 if (ObjCInterfaceType *QT = 2109 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 2110 return QualType(QT, 0); 2111 2112 // Sort the protocol list alphabetically to canonicalize it. 2113 QualType Canonical; 2114 if (NumProtocols && !areSortedAndUniqued(Protocols, NumProtocols)) { 2115 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2116 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2117 2118 unsigned UniqueCount = NumProtocols; 2119 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2120 2121 Canonical = getObjCInterfaceType(Decl, &Sorted[0], UniqueCount); 2122 2123 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos); 2124 } 2125 2126 ObjCInterfaceType *QType = new (*this, TypeAlignment) 2127 ObjCInterfaceType(Canonical, const_cast<ObjCInterfaceDecl*>(Decl), 2128 Protocols, NumProtocols); 2129 2130 Types.push_back(QType); 2131 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 2132 return QualType(QType, 0); 2133} 2134 2135/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2136/// TypeOfExprType AST's (since expression's are never shared). For example, 2137/// multiple declarations that refer to "typeof(x)" all contain different 2138/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2139/// on canonical type's (which are always unique). 2140QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2141 TypeOfExprType *toe; 2142 if (tofExpr->isTypeDependent()) { 2143 llvm::FoldingSetNodeID ID; 2144 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2145 2146 void *InsertPos = 0; 2147 DependentTypeOfExprType *Canon 2148 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2149 if (Canon) { 2150 // We already have a "canonical" version of an identical, dependent 2151 // typeof(expr) type. Use that as our canonical type. 2152 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2153 QualType((TypeOfExprType*)Canon, 0)); 2154 } 2155 else { 2156 // Build a new, canonical typeof(expr) type. 2157 Canon 2158 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2159 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2160 toe = Canon; 2161 } 2162 } else { 2163 QualType Canonical = getCanonicalType(tofExpr->getType()); 2164 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2165 } 2166 Types.push_back(toe); 2167 return QualType(toe, 0); 2168} 2169 2170/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2171/// TypeOfType AST's. The only motivation to unique these nodes would be 2172/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2173/// an issue. This doesn't effect the type checker, since it operates 2174/// on canonical type's (which are always unique). 2175QualType ASTContext::getTypeOfType(QualType tofType) { 2176 QualType Canonical = getCanonicalType(tofType); 2177 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2178 Types.push_back(tot); 2179 return QualType(tot, 0); 2180} 2181 2182/// getDecltypeForExpr - Given an expr, will return the decltype for that 2183/// expression, according to the rules in C++0x [dcl.type.simple]p4 2184static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2185 if (e->isTypeDependent()) 2186 return Context.DependentTy; 2187 2188 // If e is an id expression or a class member access, decltype(e) is defined 2189 // as the type of the entity named by e. 2190 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2191 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2192 return VD->getType(); 2193 } 2194 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2195 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2196 return FD->getType(); 2197 } 2198 // If e is a function call or an invocation of an overloaded operator, 2199 // (parentheses around e are ignored), decltype(e) is defined as the 2200 // return type of that function. 2201 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2202 return CE->getCallReturnType(); 2203 2204 QualType T = e->getType(); 2205 2206 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2207 // defined as T&, otherwise decltype(e) is defined as T. 2208 if (e->isLvalue(Context) == Expr::LV_Valid) 2209 T = Context.getLValueReferenceType(T); 2210 2211 return T; 2212} 2213 2214/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2215/// DecltypeType AST's. The only motivation to unique these nodes would be 2216/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2217/// an issue. This doesn't effect the type checker, since it operates 2218/// on canonical type's (which are always unique). 2219QualType ASTContext::getDecltypeType(Expr *e) { 2220 DecltypeType *dt; 2221 if (e->isTypeDependent()) { 2222 llvm::FoldingSetNodeID ID; 2223 DependentDecltypeType::Profile(ID, *this, e); 2224 2225 void *InsertPos = 0; 2226 DependentDecltypeType *Canon 2227 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2228 if (Canon) { 2229 // We already have a "canonical" version of an equivalent, dependent 2230 // decltype type. Use that as our canonical type. 2231 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2232 QualType((DecltypeType*)Canon, 0)); 2233 } 2234 else { 2235 // Build a new, canonical typeof(expr) type. 2236 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2237 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2238 dt = Canon; 2239 } 2240 } else { 2241 QualType T = getDecltypeForExpr(e, *this); 2242 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2243 } 2244 Types.push_back(dt); 2245 return QualType(dt, 0); 2246} 2247 2248/// getTagDeclType - Return the unique reference to the type for the 2249/// specified TagDecl (struct/union/class/enum) decl. 2250QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2251 assert (Decl); 2252 // FIXME: What is the design on getTagDeclType when it requires casting 2253 // away const? mutable? 2254 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2255} 2256 2257/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2258/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2259/// needs to agree with the definition in <stddef.h>. 2260QualType ASTContext::getSizeType() const { 2261 return getFromTargetType(Target.getSizeType()); 2262} 2263 2264/// getSignedWCharType - Return the type of "signed wchar_t". 2265/// Used when in C++, as a GCC extension. 2266QualType ASTContext::getSignedWCharType() const { 2267 // FIXME: derive from "Target" ? 2268 return WCharTy; 2269} 2270 2271/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2272/// Used when in C++, as a GCC extension. 2273QualType ASTContext::getUnsignedWCharType() const { 2274 // FIXME: derive from "Target" ? 2275 return UnsignedIntTy; 2276} 2277 2278/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2279/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2280QualType ASTContext::getPointerDiffType() const { 2281 return getFromTargetType(Target.getPtrDiffType(0)); 2282} 2283 2284//===----------------------------------------------------------------------===// 2285// Type Operators 2286//===----------------------------------------------------------------------===// 2287 2288CanQualType ASTContext::getCanonicalParamType(QualType T) { 2289 // Push qualifiers into arrays, and then discard any remaining 2290 // qualifiers. 2291 T = getCanonicalType(T); 2292 const Type *Ty = T.getTypePtr(); 2293 2294 QualType Result; 2295 if (isa<ArrayType>(Ty)) { 2296 Result = getArrayDecayedType(QualType(Ty,0)); 2297 } else if (isa<FunctionType>(Ty)) { 2298 Result = getPointerType(QualType(Ty, 0)); 2299 } else { 2300 Result = QualType(Ty, 0); 2301 } 2302 2303 return CanQualType::CreateUnsafe(Result); 2304} 2305 2306/// getCanonicalType - Return the canonical (structural) type corresponding to 2307/// the specified potentially non-canonical type. The non-canonical version 2308/// of a type may have many "decorated" versions of types. Decorators can 2309/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2310/// to be free of any of these, allowing two canonical types to be compared 2311/// for exact equality with a simple pointer comparison. 2312CanQualType ASTContext::getCanonicalType(QualType T) { 2313 QualifierCollector Quals; 2314 const Type *Ptr = Quals.strip(T); 2315 QualType CanType = Ptr->getCanonicalTypeInternal(); 2316 2317 // The canonical internal type will be the canonical type *except* 2318 // that we push type qualifiers down through array types. 2319 2320 // If there are no new qualifiers to push down, stop here. 2321 if (!Quals.hasQualifiers()) 2322 return CanQualType::CreateUnsafe(CanType); 2323 2324 // If the type qualifiers are on an array type, get the canonical 2325 // type of the array with the qualifiers applied to the element 2326 // type. 2327 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2328 if (!AT) 2329 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2330 2331 // Get the canonical version of the element with the extra qualifiers on it. 2332 // This can recursively sink qualifiers through multiple levels of arrays. 2333 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2334 NewEltTy = getCanonicalType(NewEltTy); 2335 2336 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2337 return CanQualType::CreateUnsafe( 2338 getConstantArrayType(NewEltTy, CAT->getSize(), 2339 CAT->getSizeModifier(), 2340 CAT->getIndexTypeCVRQualifiers())); 2341 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2342 return CanQualType::CreateUnsafe( 2343 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2344 IAT->getIndexTypeCVRQualifiers())); 2345 2346 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2347 return CanQualType::CreateUnsafe( 2348 getDependentSizedArrayType(NewEltTy, 2349 DSAT->getSizeExpr() ? 2350 DSAT->getSizeExpr()->Retain() : 0, 2351 DSAT->getSizeModifier(), 2352 DSAT->getIndexTypeCVRQualifiers(), 2353 DSAT->getBracketsRange())->getCanonicalTypeInternal()); 2354 2355 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2356 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2357 VAT->getSizeExpr() ? 2358 VAT->getSizeExpr()->Retain() : 0, 2359 VAT->getSizeModifier(), 2360 VAT->getIndexTypeCVRQualifiers(), 2361 VAT->getBracketsRange())); 2362} 2363 2364DeclarationName ASTContext::getNameForTemplate(TemplateName Name) { 2365 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2366 return TD->getDeclName(); 2367 2368 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2369 if (DTN->isIdentifier()) { 2370 return DeclarationNames.getIdentifier(DTN->getIdentifier()); 2371 } else { 2372 return DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2373 } 2374 } 2375 2376 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2377 assert(Storage); 2378 return (*Storage->begin())->getDeclName(); 2379} 2380 2381TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2382 // If this template name refers to a template, the canonical 2383 // template name merely stores the template itself. 2384 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2385 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2386 2387 assert(!Name.getAsOverloadedTemplate()); 2388 2389 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2390 assert(DTN && "Non-dependent template names must refer to template decls."); 2391 return DTN->CanonicalTemplateName; 2392} 2393 2394bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2395 X = getCanonicalTemplateName(X); 2396 Y = getCanonicalTemplateName(Y); 2397 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2398} 2399 2400TemplateArgument 2401ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2402 switch (Arg.getKind()) { 2403 case TemplateArgument::Null: 2404 return Arg; 2405 2406 case TemplateArgument::Expression: 2407 return Arg; 2408 2409 case TemplateArgument::Declaration: 2410 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2411 2412 case TemplateArgument::Template: 2413 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2414 2415 case TemplateArgument::Integral: 2416 return TemplateArgument(*Arg.getAsIntegral(), 2417 getCanonicalType(Arg.getIntegralType())); 2418 2419 case TemplateArgument::Type: 2420 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2421 2422 case TemplateArgument::Pack: { 2423 // FIXME: Allocate in ASTContext 2424 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2425 unsigned Idx = 0; 2426 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2427 AEnd = Arg.pack_end(); 2428 A != AEnd; (void)++A, ++Idx) 2429 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2430 2431 TemplateArgument Result; 2432 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2433 return Result; 2434 } 2435 } 2436 2437 // Silence GCC warning 2438 assert(false && "Unhandled template argument kind"); 2439 return TemplateArgument(); 2440} 2441 2442NestedNameSpecifier * 2443ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2444 if (!NNS) 2445 return 0; 2446 2447 switch (NNS->getKind()) { 2448 case NestedNameSpecifier::Identifier: 2449 // Canonicalize the prefix but keep the identifier the same. 2450 return NestedNameSpecifier::Create(*this, 2451 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2452 NNS->getAsIdentifier()); 2453 2454 case NestedNameSpecifier::Namespace: 2455 // A namespace is canonical; build a nested-name-specifier with 2456 // this namespace and no prefix. 2457 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2458 2459 case NestedNameSpecifier::TypeSpec: 2460 case NestedNameSpecifier::TypeSpecWithTemplate: { 2461 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2462 return NestedNameSpecifier::Create(*this, 0, 2463 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2464 T.getTypePtr()); 2465 } 2466 2467 case NestedNameSpecifier::Global: 2468 // The global specifier is canonical and unique. 2469 return NNS; 2470 } 2471 2472 // Required to silence a GCC warning 2473 return 0; 2474} 2475 2476 2477const ArrayType *ASTContext::getAsArrayType(QualType T) { 2478 // Handle the non-qualified case efficiently. 2479 if (!T.hasLocalQualifiers()) { 2480 // Handle the common positive case fast. 2481 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2482 return AT; 2483 } 2484 2485 // Handle the common negative case fast. 2486 QualType CType = T->getCanonicalTypeInternal(); 2487 if (!isa<ArrayType>(CType)) 2488 return 0; 2489 2490 // Apply any qualifiers from the array type to the element type. This 2491 // implements C99 6.7.3p8: "If the specification of an array type includes 2492 // any type qualifiers, the element type is so qualified, not the array type." 2493 2494 // If we get here, we either have type qualifiers on the type, or we have 2495 // sugar such as a typedef in the way. If we have type qualifiers on the type 2496 // we must propagate them down into the element type. 2497 2498 QualifierCollector Qs; 2499 const Type *Ty = Qs.strip(T.getDesugaredType()); 2500 2501 // If we have a simple case, just return now. 2502 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2503 if (ATy == 0 || Qs.empty()) 2504 return ATy; 2505 2506 // Otherwise, we have an array and we have qualifiers on it. Push the 2507 // qualifiers into the array element type and return a new array type. 2508 // Get the canonical version of the element with the extra qualifiers on it. 2509 // This can recursively sink qualifiers through multiple levels of arrays. 2510 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2511 2512 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2513 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2514 CAT->getSizeModifier(), 2515 CAT->getIndexTypeCVRQualifiers())); 2516 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2517 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2518 IAT->getSizeModifier(), 2519 IAT->getIndexTypeCVRQualifiers())); 2520 2521 if (const DependentSizedArrayType *DSAT 2522 = dyn_cast<DependentSizedArrayType>(ATy)) 2523 return cast<ArrayType>( 2524 getDependentSizedArrayType(NewEltTy, 2525 DSAT->getSizeExpr() ? 2526 DSAT->getSizeExpr()->Retain() : 0, 2527 DSAT->getSizeModifier(), 2528 DSAT->getIndexTypeCVRQualifiers(), 2529 DSAT->getBracketsRange())); 2530 2531 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2532 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2533 VAT->getSizeExpr() ? 2534 VAT->getSizeExpr()->Retain() : 0, 2535 VAT->getSizeModifier(), 2536 VAT->getIndexTypeCVRQualifiers(), 2537 VAT->getBracketsRange())); 2538} 2539 2540 2541/// getArrayDecayedType - Return the properly qualified result of decaying the 2542/// specified array type to a pointer. This operation is non-trivial when 2543/// handling typedefs etc. The canonical type of "T" must be an array type, 2544/// this returns a pointer to a properly qualified element of the array. 2545/// 2546/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2547QualType ASTContext::getArrayDecayedType(QualType Ty) { 2548 // Get the element type with 'getAsArrayType' so that we don't lose any 2549 // typedefs in the element type of the array. This also handles propagation 2550 // of type qualifiers from the array type into the element type if present 2551 // (C99 6.7.3p8). 2552 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2553 assert(PrettyArrayType && "Not an array type!"); 2554 2555 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2556 2557 // int x[restrict 4] -> int *restrict 2558 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2559} 2560 2561QualType ASTContext::getBaseElementType(QualType QT) { 2562 QualifierCollector Qs; 2563 while (true) { 2564 const Type *UT = Qs.strip(QT); 2565 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2566 QT = AT->getElementType(); 2567 } else { 2568 return Qs.apply(QT); 2569 } 2570 } 2571} 2572 2573QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2574 QualType ElemTy = AT->getElementType(); 2575 2576 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2577 return getBaseElementType(AT); 2578 2579 return ElemTy; 2580} 2581 2582/// getConstantArrayElementCount - Returns number of constant array elements. 2583uint64_t 2584ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2585 uint64_t ElementCount = 1; 2586 do { 2587 ElementCount *= CA->getSize().getZExtValue(); 2588 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2589 } while (CA); 2590 return ElementCount; 2591} 2592 2593/// getFloatingRank - Return a relative rank for floating point types. 2594/// This routine will assert if passed a built-in type that isn't a float. 2595static FloatingRank getFloatingRank(QualType T) { 2596 if (const ComplexType *CT = T->getAs<ComplexType>()) 2597 return getFloatingRank(CT->getElementType()); 2598 2599 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2600 switch (T->getAs<BuiltinType>()->getKind()) { 2601 default: assert(0 && "getFloatingRank(): not a floating type"); 2602 case BuiltinType::Float: return FloatRank; 2603 case BuiltinType::Double: return DoubleRank; 2604 case BuiltinType::LongDouble: return LongDoubleRank; 2605 } 2606} 2607 2608/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2609/// point or a complex type (based on typeDomain/typeSize). 2610/// 'typeDomain' is a real floating point or complex type. 2611/// 'typeSize' is a real floating point or complex type. 2612QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2613 QualType Domain) const { 2614 FloatingRank EltRank = getFloatingRank(Size); 2615 if (Domain->isComplexType()) { 2616 switch (EltRank) { 2617 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2618 case FloatRank: return FloatComplexTy; 2619 case DoubleRank: return DoubleComplexTy; 2620 case LongDoubleRank: return LongDoubleComplexTy; 2621 } 2622 } 2623 2624 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2625 switch (EltRank) { 2626 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2627 case FloatRank: return FloatTy; 2628 case DoubleRank: return DoubleTy; 2629 case LongDoubleRank: return LongDoubleTy; 2630 } 2631} 2632 2633/// getFloatingTypeOrder - Compare the rank of the two specified floating 2634/// point types, ignoring the domain of the type (i.e. 'double' == 2635/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2636/// LHS < RHS, return -1. 2637int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2638 FloatingRank LHSR = getFloatingRank(LHS); 2639 FloatingRank RHSR = getFloatingRank(RHS); 2640 2641 if (LHSR == RHSR) 2642 return 0; 2643 if (LHSR > RHSR) 2644 return 1; 2645 return -1; 2646} 2647 2648/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2649/// routine will assert if passed a built-in type that isn't an integer or enum, 2650/// or if it is not canonicalized. 2651unsigned ASTContext::getIntegerRank(Type *T) { 2652 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 2653 if (EnumType* ET = dyn_cast<EnumType>(T)) 2654 T = ET->getDecl()->getIntegerType().getTypePtr(); 2655 2656 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2657 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2658 2659 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2660 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2661 2662 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2663 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2664 2665 // There are two things which impact the integer rank: the width, and 2666 // the ordering of builtins. The builtin ordering is encoded in the 2667 // bottom three bits; the width is encoded in the bits above that. 2668 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2669 return FWIT->getWidth() << 3; 2670 2671 switch (cast<BuiltinType>(T)->getKind()) { 2672 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2673 case BuiltinType::Bool: 2674 return 1 + (getIntWidth(BoolTy) << 3); 2675 case BuiltinType::Char_S: 2676 case BuiltinType::Char_U: 2677 case BuiltinType::SChar: 2678 case BuiltinType::UChar: 2679 return 2 + (getIntWidth(CharTy) << 3); 2680 case BuiltinType::Short: 2681 case BuiltinType::UShort: 2682 return 3 + (getIntWidth(ShortTy) << 3); 2683 case BuiltinType::Int: 2684 case BuiltinType::UInt: 2685 return 4 + (getIntWidth(IntTy) << 3); 2686 case BuiltinType::Long: 2687 case BuiltinType::ULong: 2688 return 5 + (getIntWidth(LongTy) << 3); 2689 case BuiltinType::LongLong: 2690 case BuiltinType::ULongLong: 2691 return 6 + (getIntWidth(LongLongTy) << 3); 2692 case BuiltinType::Int128: 2693 case BuiltinType::UInt128: 2694 return 7 + (getIntWidth(Int128Ty) << 3); 2695 } 2696} 2697 2698/// \brief Whether this is a promotable bitfield reference according 2699/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2700/// 2701/// \returns the type this bit-field will promote to, or NULL if no 2702/// promotion occurs. 2703QualType ASTContext::isPromotableBitField(Expr *E) { 2704 FieldDecl *Field = E->getBitField(); 2705 if (!Field) 2706 return QualType(); 2707 2708 QualType FT = Field->getType(); 2709 2710 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2711 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2712 uint64_t IntSize = getTypeSize(IntTy); 2713 // GCC extension compatibility: if the bit-field size is less than or equal 2714 // to the size of int, it gets promoted no matter what its type is. 2715 // For instance, unsigned long bf : 4 gets promoted to signed int. 2716 if (BitWidth < IntSize) 2717 return IntTy; 2718 2719 if (BitWidth == IntSize) 2720 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2721 2722 // Types bigger than int are not subject to promotions, and therefore act 2723 // like the base type. 2724 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2725 // is ridiculous. 2726 return QualType(); 2727} 2728 2729/// getPromotedIntegerType - Returns the type that Promotable will 2730/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2731/// integer type. 2732QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2733 assert(!Promotable.isNull()); 2734 assert(Promotable->isPromotableIntegerType()); 2735 if (Promotable->isSignedIntegerType()) 2736 return IntTy; 2737 uint64_t PromotableSize = getTypeSize(Promotable); 2738 uint64_t IntSize = getTypeSize(IntTy); 2739 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2740 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2741} 2742 2743/// getIntegerTypeOrder - Returns the highest ranked integer type: 2744/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2745/// LHS < RHS, return -1. 2746int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2747 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2748 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2749 if (LHSC == RHSC) return 0; 2750 2751 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2752 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2753 2754 unsigned LHSRank = getIntegerRank(LHSC); 2755 unsigned RHSRank = getIntegerRank(RHSC); 2756 2757 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2758 if (LHSRank == RHSRank) return 0; 2759 return LHSRank > RHSRank ? 1 : -1; 2760 } 2761 2762 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2763 if (LHSUnsigned) { 2764 // If the unsigned [LHS] type is larger, return it. 2765 if (LHSRank >= RHSRank) 2766 return 1; 2767 2768 // If the signed type can represent all values of the unsigned type, it 2769 // wins. Because we are dealing with 2's complement and types that are 2770 // powers of two larger than each other, this is always safe. 2771 return -1; 2772 } 2773 2774 // If the unsigned [RHS] type is larger, return it. 2775 if (RHSRank >= LHSRank) 2776 return -1; 2777 2778 // If the signed type can represent all values of the unsigned type, it 2779 // wins. Because we are dealing with 2's complement and types that are 2780 // powers of two larger than each other, this is always safe. 2781 return 1; 2782} 2783 2784static RecordDecl * 2785CreateRecordDecl(ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 2786 SourceLocation L, IdentifierInfo *Id) { 2787 if (Ctx.getLangOptions().CPlusPlus) 2788 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 2789 else 2790 return RecordDecl::Create(Ctx, TK, DC, L, Id); 2791} 2792 2793// getCFConstantStringType - Return the type used for constant CFStrings. 2794QualType ASTContext::getCFConstantStringType() { 2795 if (!CFConstantStringTypeDecl) { 2796 CFConstantStringTypeDecl = 2797 CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2798 &Idents.get("NSConstantString")); 2799 2800 QualType FieldTypes[4]; 2801 2802 // const int *isa; 2803 FieldTypes[0] = getPointerType(IntTy.withConst()); 2804 // int flags; 2805 FieldTypes[1] = IntTy; 2806 // const char *str; 2807 FieldTypes[2] = getPointerType(CharTy.withConst()); 2808 // long length; 2809 FieldTypes[3] = LongTy; 2810 2811 // Create fields 2812 for (unsigned i = 0; i < 4; ++i) { 2813 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2814 SourceLocation(), 0, 2815 FieldTypes[i], /*DInfo=*/0, 2816 /*BitWidth=*/0, 2817 /*Mutable=*/false); 2818 CFConstantStringTypeDecl->addDecl(Field); 2819 } 2820 2821 CFConstantStringTypeDecl->completeDefinition(*this); 2822 } 2823 2824 return getTagDeclType(CFConstantStringTypeDecl); 2825} 2826 2827void ASTContext::setCFConstantStringType(QualType T) { 2828 const RecordType *Rec = T->getAs<RecordType>(); 2829 assert(Rec && "Invalid CFConstantStringType"); 2830 CFConstantStringTypeDecl = Rec->getDecl(); 2831} 2832 2833QualType ASTContext::getObjCFastEnumerationStateType() { 2834 if (!ObjCFastEnumerationStateTypeDecl) { 2835 ObjCFastEnumerationStateTypeDecl = 2836 CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2837 &Idents.get("__objcFastEnumerationState")); 2838 2839 QualType FieldTypes[] = { 2840 UnsignedLongTy, 2841 getPointerType(ObjCIdTypedefType), 2842 getPointerType(UnsignedLongTy), 2843 getConstantArrayType(UnsignedLongTy, 2844 llvm::APInt(32, 5), ArrayType::Normal, 0) 2845 }; 2846 2847 for (size_t i = 0; i < 4; ++i) { 2848 FieldDecl *Field = FieldDecl::Create(*this, 2849 ObjCFastEnumerationStateTypeDecl, 2850 SourceLocation(), 0, 2851 FieldTypes[i], /*DInfo=*/0, 2852 /*BitWidth=*/0, 2853 /*Mutable=*/false); 2854 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2855 } 2856 2857 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2858 } 2859 2860 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2861} 2862 2863QualType ASTContext::getBlockDescriptorType() { 2864 if (BlockDescriptorType) 2865 return getTagDeclType(BlockDescriptorType); 2866 2867 RecordDecl *T; 2868 // FIXME: Needs the FlagAppleBlock bit. 2869 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2870 &Idents.get("__block_descriptor")); 2871 2872 QualType FieldTypes[] = { 2873 UnsignedLongTy, 2874 UnsignedLongTy, 2875 }; 2876 2877 const char *FieldNames[] = { 2878 "reserved", 2879 "Size" 2880 }; 2881 2882 for (size_t i = 0; i < 2; ++i) { 2883 FieldDecl *Field = FieldDecl::Create(*this, 2884 T, 2885 SourceLocation(), 2886 &Idents.get(FieldNames[i]), 2887 FieldTypes[i], /*DInfo=*/0, 2888 /*BitWidth=*/0, 2889 /*Mutable=*/false); 2890 T->addDecl(Field); 2891 } 2892 2893 T->completeDefinition(*this); 2894 2895 BlockDescriptorType = T; 2896 2897 return getTagDeclType(BlockDescriptorType); 2898} 2899 2900void ASTContext::setBlockDescriptorType(QualType T) { 2901 const RecordType *Rec = T->getAs<RecordType>(); 2902 assert(Rec && "Invalid BlockDescriptorType"); 2903 BlockDescriptorType = Rec->getDecl(); 2904} 2905 2906QualType ASTContext::getBlockDescriptorExtendedType() { 2907 if (BlockDescriptorExtendedType) 2908 return getTagDeclType(BlockDescriptorExtendedType); 2909 2910 RecordDecl *T; 2911 // FIXME: Needs the FlagAppleBlock bit. 2912 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2913 &Idents.get("__block_descriptor_withcopydispose")); 2914 2915 QualType FieldTypes[] = { 2916 UnsignedLongTy, 2917 UnsignedLongTy, 2918 getPointerType(VoidPtrTy), 2919 getPointerType(VoidPtrTy) 2920 }; 2921 2922 const char *FieldNames[] = { 2923 "reserved", 2924 "Size", 2925 "CopyFuncPtr", 2926 "DestroyFuncPtr" 2927 }; 2928 2929 for (size_t i = 0; i < 4; ++i) { 2930 FieldDecl *Field = FieldDecl::Create(*this, 2931 T, 2932 SourceLocation(), 2933 &Idents.get(FieldNames[i]), 2934 FieldTypes[i], /*DInfo=*/0, 2935 /*BitWidth=*/0, 2936 /*Mutable=*/false); 2937 T->addDecl(Field); 2938 } 2939 2940 T->completeDefinition(*this); 2941 2942 BlockDescriptorExtendedType = T; 2943 2944 return getTagDeclType(BlockDescriptorExtendedType); 2945} 2946 2947void ASTContext::setBlockDescriptorExtendedType(QualType T) { 2948 const RecordType *Rec = T->getAs<RecordType>(); 2949 assert(Rec && "Invalid BlockDescriptorType"); 2950 BlockDescriptorExtendedType = Rec->getDecl(); 2951} 2952 2953bool ASTContext::BlockRequiresCopying(QualType Ty) { 2954 if (Ty->isBlockPointerType()) 2955 return true; 2956 if (isObjCNSObjectType(Ty)) 2957 return true; 2958 if (Ty->isObjCObjectPointerType()) 2959 return true; 2960 return false; 2961} 2962 2963QualType ASTContext::BuildByRefType(const char *DeclName, QualType Ty) { 2964 // type = struct __Block_byref_1_X { 2965 // void *__isa; 2966 // struct __Block_byref_1_X *__forwarding; 2967 // unsigned int __flags; 2968 // unsigned int __size; 2969 // void *__copy_helper; // as needed 2970 // void *__destroy_help // as needed 2971 // int X; 2972 // } * 2973 2974 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 2975 2976 // FIXME: Move up 2977 static unsigned int UniqueBlockByRefTypeID = 0; 2978 llvm::SmallString<36> Name; 2979 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 2980 ++UniqueBlockByRefTypeID << '_' << DeclName; 2981 RecordDecl *T; 2982 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2983 &Idents.get(Name.str())); 2984 T->startDefinition(); 2985 QualType Int32Ty = IntTy; 2986 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 2987 QualType FieldTypes[] = { 2988 getPointerType(VoidPtrTy), 2989 getPointerType(getTagDeclType(T)), 2990 Int32Ty, 2991 Int32Ty, 2992 getPointerType(VoidPtrTy), 2993 getPointerType(VoidPtrTy), 2994 Ty 2995 }; 2996 2997 const char *FieldNames[] = { 2998 "__isa", 2999 "__forwarding", 3000 "__flags", 3001 "__size", 3002 "__copy_helper", 3003 "__destroy_helper", 3004 DeclName, 3005 }; 3006 3007 for (size_t i = 0; i < 7; ++i) { 3008 if (!HasCopyAndDispose && i >=4 && i <= 5) 3009 continue; 3010 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3011 &Idents.get(FieldNames[i]), 3012 FieldTypes[i], /*DInfo=*/0, 3013 /*BitWidth=*/0, /*Mutable=*/false); 3014 T->addDecl(Field); 3015 } 3016 3017 T->completeDefinition(*this); 3018 3019 return getPointerType(getTagDeclType(T)); 3020} 3021 3022 3023QualType ASTContext::getBlockParmType( 3024 bool BlockHasCopyDispose, 3025 llvm::SmallVector<const Expr *, 8> &BlockDeclRefDecls) { 3026 // FIXME: Move up 3027 static unsigned int UniqueBlockParmTypeID = 0; 3028 llvm::SmallString<36> Name; 3029 llvm::raw_svector_ostream(Name) << "__block_literal_" 3030 << ++UniqueBlockParmTypeID; 3031 RecordDecl *T; 3032 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 3033 &Idents.get(Name.str())); 3034 QualType FieldTypes[] = { 3035 getPointerType(VoidPtrTy), 3036 IntTy, 3037 IntTy, 3038 getPointerType(VoidPtrTy), 3039 (BlockHasCopyDispose ? 3040 getPointerType(getBlockDescriptorExtendedType()) : 3041 getPointerType(getBlockDescriptorType())) 3042 }; 3043 3044 const char *FieldNames[] = { 3045 "__isa", 3046 "__flags", 3047 "__reserved", 3048 "__FuncPtr", 3049 "__descriptor" 3050 }; 3051 3052 for (size_t i = 0; i < 5; ++i) { 3053 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3054 &Idents.get(FieldNames[i]), 3055 FieldTypes[i], /*DInfo=*/0, 3056 /*BitWidth=*/0, /*Mutable=*/false); 3057 T->addDecl(Field); 3058 } 3059 3060 for (size_t i = 0; i < BlockDeclRefDecls.size(); ++i) { 3061 const Expr *E = BlockDeclRefDecls[i]; 3062 const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); 3063 clang::IdentifierInfo *Name = 0; 3064 if (BDRE) { 3065 const ValueDecl *D = BDRE->getDecl(); 3066 Name = &Idents.get(D->getName()); 3067 } 3068 QualType FieldType = E->getType(); 3069 3070 if (BDRE && BDRE->isByRef()) 3071 FieldType = BuildByRefType(BDRE->getDecl()->getNameAsCString(), 3072 FieldType); 3073 3074 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3075 Name, FieldType, /*DInfo=*/0, 3076 /*BitWidth=*/0, /*Mutable=*/false); 3077 T->addDecl(Field); 3078 } 3079 3080 T->completeDefinition(*this); 3081 3082 return getPointerType(getTagDeclType(T)); 3083} 3084 3085void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3086 const RecordType *Rec = T->getAs<RecordType>(); 3087 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3088 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3089} 3090 3091// This returns true if a type has been typedefed to BOOL: 3092// typedef <type> BOOL; 3093static bool isTypeTypedefedAsBOOL(QualType T) { 3094 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3095 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3096 return II->isStr("BOOL"); 3097 3098 return false; 3099} 3100 3101/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3102/// purpose. 3103int ASTContext::getObjCEncodingTypeSize(QualType type) { 3104 uint64_t sz = getTypeSize(type); 3105 3106 // Make all integer and enum types at least as large as an int 3107 if (sz > 0 && type->isIntegralType()) 3108 sz = std::max(sz, getTypeSize(IntTy)); 3109 // Treat arrays as pointers, since that's how they're passed in. 3110 else if (type->isArrayType()) 3111 sz = getTypeSize(VoidPtrTy); 3112 return sz / getTypeSize(CharTy); 3113} 3114 3115/// getObjCEncodingForBlockDecl - Return the encoded type for this method 3116/// declaration. 3117void ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr, 3118 std::string& S) { 3119 const BlockDecl *Decl = Expr->getBlockDecl(); 3120 QualType BlockTy = 3121 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3122 // Encode result type. 3123 getObjCEncodingForType(cast<FunctionType>(BlockTy)->getResultType(), S); 3124 // Compute size of all parameters. 3125 // Start with computing size of a pointer in number of bytes. 3126 // FIXME: There might(should) be a better way of doing this computation! 3127 SourceLocation Loc; 3128 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 3129 int ParmOffset = PtrSize; 3130 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3131 E = Decl->param_end(); PI != E; ++PI) { 3132 QualType PType = (*PI)->getType(); 3133 int sz = getObjCEncodingTypeSize(PType); 3134 assert (sz > 0 && "BlockExpr - Incomplete param type"); 3135 ParmOffset += sz; 3136 } 3137 // Size of the argument frame 3138 S += llvm::utostr(ParmOffset); 3139 // Block pointer and offset. 3140 S += "@?0"; 3141 ParmOffset = PtrSize; 3142 3143 // Argument types. 3144 ParmOffset = PtrSize; 3145 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3146 Decl->param_end(); PI != E; ++PI) { 3147 ParmVarDecl *PVDecl = *PI; 3148 QualType PType = PVDecl->getOriginalType(); 3149 if (const ArrayType *AT = 3150 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3151 // Use array's original type only if it has known number of 3152 // elements. 3153 if (!isa<ConstantArrayType>(AT)) 3154 PType = PVDecl->getType(); 3155 } else if (PType->isFunctionType()) 3156 PType = PVDecl->getType(); 3157 getObjCEncodingForType(PType, S); 3158 S += llvm::utostr(ParmOffset); 3159 ParmOffset += getObjCEncodingTypeSize(PType); 3160 } 3161} 3162 3163/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3164/// declaration. 3165void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3166 std::string& S) { 3167 // FIXME: This is not very efficient. 3168 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3169 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3170 // Encode result type. 3171 getObjCEncodingForType(Decl->getResultType(), S); 3172 // Compute size of all parameters. 3173 // Start with computing size of a pointer in number of bytes. 3174 // FIXME: There might(should) be a better way of doing this computation! 3175 SourceLocation Loc; 3176 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 3177 // The first two arguments (self and _cmd) are pointers; account for 3178 // their size. 3179 int ParmOffset = 2 * PtrSize; 3180 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3181 E = Decl->param_end(); PI != E; ++PI) { 3182 QualType PType = (*PI)->getType(); 3183 int sz = getObjCEncodingTypeSize(PType); 3184 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 3185 ParmOffset += sz; 3186 } 3187 S += llvm::utostr(ParmOffset); 3188 S += "@0:"; 3189 S += llvm::utostr(PtrSize); 3190 3191 // Argument types. 3192 ParmOffset = 2 * PtrSize; 3193 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3194 E = Decl->param_end(); PI != E; ++PI) { 3195 ParmVarDecl *PVDecl = *PI; 3196 QualType PType = PVDecl->getOriginalType(); 3197 if (const ArrayType *AT = 3198 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3199 // Use array's original type only if it has known number of 3200 // elements. 3201 if (!isa<ConstantArrayType>(AT)) 3202 PType = PVDecl->getType(); 3203 } else if (PType->isFunctionType()) 3204 PType = PVDecl->getType(); 3205 // Process argument qualifiers for user supplied arguments; such as, 3206 // 'in', 'inout', etc. 3207 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3208 getObjCEncodingForType(PType, S); 3209 S += llvm::utostr(ParmOffset); 3210 ParmOffset += getObjCEncodingTypeSize(PType); 3211 } 3212} 3213 3214/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3215/// property declaration. If non-NULL, Container must be either an 3216/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3217/// NULL when getting encodings for protocol properties. 3218/// Property attributes are stored as a comma-delimited C string. The simple 3219/// attributes readonly and bycopy are encoded as single characters. The 3220/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3221/// encoded as single characters, followed by an identifier. Property types 3222/// are also encoded as a parametrized attribute. The characters used to encode 3223/// these attributes are defined by the following enumeration: 3224/// @code 3225/// enum PropertyAttributes { 3226/// kPropertyReadOnly = 'R', // property is read-only. 3227/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3228/// kPropertyByref = '&', // property is a reference to the value last assigned 3229/// kPropertyDynamic = 'D', // property is dynamic 3230/// kPropertyGetter = 'G', // followed by getter selector name 3231/// kPropertySetter = 'S', // followed by setter selector name 3232/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3233/// kPropertyType = 't' // followed by old-style type encoding. 3234/// kPropertyWeak = 'W' // 'weak' property 3235/// kPropertyStrong = 'P' // property GC'able 3236/// kPropertyNonAtomic = 'N' // property non-atomic 3237/// }; 3238/// @endcode 3239void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3240 const Decl *Container, 3241 std::string& S) { 3242 // Collect information from the property implementation decl(s). 3243 bool Dynamic = false; 3244 ObjCPropertyImplDecl *SynthesizePID = 0; 3245 3246 // FIXME: Duplicated code due to poor abstraction. 3247 if (Container) { 3248 if (const ObjCCategoryImplDecl *CID = 3249 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3250 for (ObjCCategoryImplDecl::propimpl_iterator 3251 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3252 i != e; ++i) { 3253 ObjCPropertyImplDecl *PID = *i; 3254 if (PID->getPropertyDecl() == PD) { 3255 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3256 Dynamic = true; 3257 } else { 3258 SynthesizePID = PID; 3259 } 3260 } 3261 } 3262 } else { 3263 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3264 for (ObjCCategoryImplDecl::propimpl_iterator 3265 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3266 i != e; ++i) { 3267 ObjCPropertyImplDecl *PID = *i; 3268 if (PID->getPropertyDecl() == PD) { 3269 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3270 Dynamic = true; 3271 } else { 3272 SynthesizePID = PID; 3273 } 3274 } 3275 } 3276 } 3277 } 3278 3279 // FIXME: This is not very efficient. 3280 S = "T"; 3281 3282 // Encode result type. 3283 // GCC has some special rules regarding encoding of properties which 3284 // closely resembles encoding of ivars. 3285 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3286 true /* outermost type */, 3287 true /* encoding for property */); 3288 3289 if (PD->isReadOnly()) { 3290 S += ",R"; 3291 } else { 3292 switch (PD->getSetterKind()) { 3293 case ObjCPropertyDecl::Assign: break; 3294 case ObjCPropertyDecl::Copy: S += ",C"; break; 3295 case ObjCPropertyDecl::Retain: S += ",&"; break; 3296 } 3297 } 3298 3299 // It really isn't clear at all what this means, since properties 3300 // are "dynamic by default". 3301 if (Dynamic) 3302 S += ",D"; 3303 3304 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3305 S += ",N"; 3306 3307 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3308 S += ",G"; 3309 S += PD->getGetterName().getAsString(); 3310 } 3311 3312 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3313 S += ",S"; 3314 S += PD->getSetterName().getAsString(); 3315 } 3316 3317 if (SynthesizePID) { 3318 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3319 S += ",V"; 3320 S += OID->getNameAsString(); 3321 } 3322 3323 // FIXME: OBJCGC: weak & strong 3324} 3325 3326/// getLegacyIntegralTypeEncoding - 3327/// Another legacy compatibility encoding: 32-bit longs are encoded as 3328/// 'l' or 'L' , but not always. For typedefs, we need to use 3329/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3330/// 3331void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3332 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3333 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3334 if (BT->getKind() == BuiltinType::ULong && 3335 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3336 PointeeTy = UnsignedIntTy; 3337 else 3338 if (BT->getKind() == BuiltinType::Long && 3339 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3340 PointeeTy = IntTy; 3341 } 3342 } 3343} 3344 3345void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3346 const FieldDecl *Field) { 3347 // We follow the behavior of gcc, expanding structures which are 3348 // directly pointed to, and expanding embedded structures. Note that 3349 // these rules are sufficient to prevent recursive encoding of the 3350 // same type. 3351 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3352 true /* outermost type */); 3353} 3354 3355static void EncodeBitField(const ASTContext *Context, std::string& S, 3356 const FieldDecl *FD) { 3357 const Expr *E = FD->getBitWidth(); 3358 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3359 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3360 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3361 S += 'b'; 3362 S += llvm::utostr(N); 3363} 3364 3365// FIXME: Use SmallString for accumulating string. 3366void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3367 bool ExpandPointedToStructures, 3368 bool ExpandStructures, 3369 const FieldDecl *FD, 3370 bool OutermostType, 3371 bool EncodingProperty) { 3372 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3373 if (FD && FD->isBitField()) 3374 return EncodeBitField(this, S, FD); 3375 char encoding; 3376 switch (BT->getKind()) { 3377 default: assert(0 && "Unhandled builtin type kind"); 3378 case BuiltinType::Void: encoding = 'v'; break; 3379 case BuiltinType::Bool: encoding = 'B'; break; 3380 case BuiltinType::Char_U: 3381 case BuiltinType::UChar: encoding = 'C'; break; 3382 case BuiltinType::UShort: encoding = 'S'; break; 3383 case BuiltinType::UInt: encoding = 'I'; break; 3384 case BuiltinType::ULong: 3385 encoding = 3386 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3387 break; 3388 case BuiltinType::UInt128: encoding = 'T'; break; 3389 case BuiltinType::ULongLong: encoding = 'Q'; break; 3390 case BuiltinType::Char_S: 3391 case BuiltinType::SChar: encoding = 'c'; break; 3392 case BuiltinType::Short: encoding = 's'; break; 3393 case BuiltinType::Int: encoding = 'i'; break; 3394 case BuiltinType::Long: 3395 encoding = 3396 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3397 break; 3398 case BuiltinType::LongLong: encoding = 'q'; break; 3399 case BuiltinType::Int128: encoding = 't'; break; 3400 case BuiltinType::Float: encoding = 'f'; break; 3401 case BuiltinType::Double: encoding = 'd'; break; 3402 case BuiltinType::LongDouble: encoding = 'd'; break; 3403 } 3404 3405 S += encoding; 3406 return; 3407 } 3408 3409 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3410 S += 'j'; 3411 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3412 false); 3413 return; 3414 } 3415 3416 if (const PointerType *PT = T->getAs<PointerType>()) { 3417 if (PT->isObjCSelType()) { 3418 S += ':'; 3419 return; 3420 } 3421 QualType PointeeTy = PT->getPointeeType(); 3422 3423 bool isReadOnly = false; 3424 // For historical/compatibility reasons, the read-only qualifier of the 3425 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3426 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3427 // Also, do not emit the 'r' for anything but the outermost type! 3428 if (isa<TypedefType>(T.getTypePtr())) { 3429 if (OutermostType && T.isConstQualified()) { 3430 isReadOnly = true; 3431 S += 'r'; 3432 } 3433 } else if (OutermostType) { 3434 QualType P = PointeeTy; 3435 while (P->getAs<PointerType>()) 3436 P = P->getAs<PointerType>()->getPointeeType(); 3437 if (P.isConstQualified()) { 3438 isReadOnly = true; 3439 S += 'r'; 3440 } 3441 } 3442 if (isReadOnly) { 3443 // Another legacy compatibility encoding. Some ObjC qualifier and type 3444 // combinations need to be rearranged. 3445 // Rewrite "in const" from "nr" to "rn" 3446 const char * s = S.c_str(); 3447 int len = S.length(); 3448 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3449 std::string replace = "rn"; 3450 S.replace(S.end()-2, S.end(), replace); 3451 } 3452 } 3453 3454 if (PointeeTy->isCharType()) { 3455 // char pointer types should be encoded as '*' unless it is a 3456 // type that has been typedef'd to 'BOOL'. 3457 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3458 S += '*'; 3459 return; 3460 } 3461 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3462 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3463 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3464 S += '#'; 3465 return; 3466 } 3467 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3468 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3469 S += '@'; 3470 return; 3471 } 3472 // fall through... 3473 } 3474 S += '^'; 3475 getLegacyIntegralTypeEncoding(PointeeTy); 3476 3477 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3478 NULL); 3479 return; 3480 } 3481 3482 if (const ArrayType *AT = 3483 // Ignore type qualifiers etc. 3484 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3485 if (isa<IncompleteArrayType>(AT)) { 3486 // Incomplete arrays are encoded as a pointer to the array element. 3487 S += '^'; 3488 3489 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3490 false, ExpandStructures, FD); 3491 } else { 3492 S += '['; 3493 3494 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3495 S += llvm::utostr(CAT->getSize().getZExtValue()); 3496 else { 3497 //Variable length arrays are encoded as a regular array with 0 elements. 3498 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3499 S += '0'; 3500 } 3501 3502 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3503 false, ExpandStructures, FD); 3504 S += ']'; 3505 } 3506 return; 3507 } 3508 3509 if (T->getAs<FunctionType>()) { 3510 S += '?'; 3511 return; 3512 } 3513 3514 if (const RecordType *RTy = T->getAs<RecordType>()) { 3515 RecordDecl *RDecl = RTy->getDecl(); 3516 S += RDecl->isUnion() ? '(' : '{'; 3517 // Anonymous structures print as '?' 3518 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3519 S += II->getName(); 3520 } else { 3521 S += '?'; 3522 } 3523 if (ExpandStructures) { 3524 S += '='; 3525 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3526 FieldEnd = RDecl->field_end(); 3527 Field != FieldEnd; ++Field) { 3528 if (FD) { 3529 S += '"'; 3530 S += Field->getNameAsString(); 3531 S += '"'; 3532 } 3533 3534 // Special case bit-fields. 3535 if (Field->isBitField()) { 3536 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3537 (*Field)); 3538 } else { 3539 QualType qt = Field->getType(); 3540 getLegacyIntegralTypeEncoding(qt); 3541 getObjCEncodingForTypeImpl(qt, S, false, true, 3542 FD); 3543 } 3544 } 3545 } 3546 S += RDecl->isUnion() ? ')' : '}'; 3547 return; 3548 } 3549 3550 if (T->isEnumeralType()) { 3551 if (FD && FD->isBitField()) 3552 EncodeBitField(this, S, FD); 3553 else 3554 S += 'i'; 3555 return; 3556 } 3557 3558 if (T->isBlockPointerType()) { 3559 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3560 return; 3561 } 3562 3563 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3564 // @encode(class_name) 3565 ObjCInterfaceDecl *OI = OIT->getDecl(); 3566 S += '{'; 3567 const IdentifierInfo *II = OI->getIdentifier(); 3568 S += II->getName(); 3569 S += '='; 3570 llvm::SmallVector<FieldDecl*, 32> RecFields; 3571 CollectObjCIvars(OI, RecFields); 3572 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3573 if (RecFields[i]->isBitField()) 3574 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3575 RecFields[i]); 3576 else 3577 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3578 FD); 3579 } 3580 S += '}'; 3581 return; 3582 } 3583 3584 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3585 if (OPT->isObjCIdType()) { 3586 S += '@'; 3587 return; 3588 } 3589 3590 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 3591 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 3592 // Since this is a binary compatibility issue, need to consult with runtime 3593 // folks. Fortunately, this is a *very* obsure construct. 3594 S += '#'; 3595 return; 3596 } 3597 3598 if (OPT->isObjCQualifiedIdType()) { 3599 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3600 ExpandPointedToStructures, 3601 ExpandStructures, FD); 3602 if (FD || EncodingProperty) { 3603 // Note that we do extended encoding of protocol qualifer list 3604 // Only when doing ivar or property encoding. 3605 S += '"'; 3606 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3607 E = OPT->qual_end(); I != E; ++I) { 3608 S += '<'; 3609 S += (*I)->getNameAsString(); 3610 S += '>'; 3611 } 3612 S += '"'; 3613 } 3614 return; 3615 } 3616 3617 QualType PointeeTy = OPT->getPointeeType(); 3618 if (!EncodingProperty && 3619 isa<TypedefType>(PointeeTy.getTypePtr())) { 3620 // Another historical/compatibility reason. 3621 // We encode the underlying type which comes out as 3622 // {...}; 3623 S += '^'; 3624 getObjCEncodingForTypeImpl(PointeeTy, S, 3625 false, ExpandPointedToStructures, 3626 NULL); 3627 return; 3628 } 3629 3630 S += '@'; 3631 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 3632 S += '"'; 3633 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 3634 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3635 E = OPT->qual_end(); I != E; ++I) { 3636 S += '<'; 3637 S += (*I)->getNameAsString(); 3638 S += '>'; 3639 } 3640 S += '"'; 3641 } 3642 return; 3643 } 3644 3645 assert(0 && "@encode for type not implemented!"); 3646} 3647 3648void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3649 std::string& S) const { 3650 if (QT & Decl::OBJC_TQ_In) 3651 S += 'n'; 3652 if (QT & Decl::OBJC_TQ_Inout) 3653 S += 'N'; 3654 if (QT & Decl::OBJC_TQ_Out) 3655 S += 'o'; 3656 if (QT & Decl::OBJC_TQ_Bycopy) 3657 S += 'O'; 3658 if (QT & Decl::OBJC_TQ_Byref) 3659 S += 'R'; 3660 if (QT & Decl::OBJC_TQ_Oneway) 3661 S += 'V'; 3662} 3663 3664void ASTContext::setBuiltinVaListType(QualType T) { 3665 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3666 3667 BuiltinVaListType = T; 3668} 3669 3670void ASTContext::setObjCIdType(QualType T) { 3671 ObjCIdTypedefType = T; 3672} 3673 3674void ASTContext::setObjCSelType(QualType T) { 3675 ObjCSelTypedefType = T; 3676} 3677 3678void ASTContext::setObjCProtoType(QualType QT) { 3679 ObjCProtoType = QT; 3680} 3681 3682void ASTContext::setObjCClassType(QualType T) { 3683 ObjCClassTypedefType = T; 3684} 3685 3686void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3687 assert(ObjCConstantStringType.isNull() && 3688 "'NSConstantString' type already set!"); 3689 3690 ObjCConstantStringType = getObjCInterfaceType(Decl); 3691} 3692 3693/// \brief Retrieve the template name that corresponds to a non-empty 3694/// lookup. 3695TemplateName ASTContext::getOverloadedTemplateName(NamedDecl * const *Begin, 3696 NamedDecl * const *End) { 3697 unsigned size = End - Begin; 3698 assert(size > 1 && "set is not overloaded!"); 3699 3700 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 3701 size * sizeof(FunctionTemplateDecl*)); 3702 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 3703 3704 NamedDecl **Storage = OT->getStorage(); 3705 for (NamedDecl * const *I = Begin; I != End; ++I) { 3706 NamedDecl *D = *I; 3707 assert(isa<FunctionTemplateDecl>(D) || 3708 (isa<UsingShadowDecl>(D) && 3709 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 3710 *Storage++ = D; 3711 } 3712 3713 return TemplateName(OT); 3714} 3715 3716/// \brief Retrieve the template name that represents a qualified 3717/// template name such as \c std::vector. 3718TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3719 bool TemplateKeyword, 3720 TemplateDecl *Template) { 3721 llvm::FoldingSetNodeID ID; 3722 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3723 3724 void *InsertPos = 0; 3725 QualifiedTemplateName *QTN = 3726 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3727 if (!QTN) { 3728 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3729 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3730 } 3731 3732 return TemplateName(QTN); 3733} 3734 3735/// \brief Retrieve the template name that represents a dependent 3736/// template name such as \c MetaFun::template apply. 3737TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3738 const IdentifierInfo *Name) { 3739 assert((!NNS || NNS->isDependent()) && 3740 "Nested name specifier must be dependent"); 3741 3742 llvm::FoldingSetNodeID ID; 3743 DependentTemplateName::Profile(ID, NNS, Name); 3744 3745 void *InsertPos = 0; 3746 DependentTemplateName *QTN = 3747 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3748 3749 if (QTN) 3750 return TemplateName(QTN); 3751 3752 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3753 if (CanonNNS == NNS) { 3754 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3755 } else { 3756 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3757 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3758 } 3759 3760 DependentTemplateNames.InsertNode(QTN, InsertPos); 3761 return TemplateName(QTN); 3762} 3763 3764/// \brief Retrieve the template name that represents a dependent 3765/// template name such as \c MetaFun::template operator+. 3766TemplateName 3767ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3768 OverloadedOperatorKind Operator) { 3769 assert((!NNS || NNS->isDependent()) && 3770 "Nested name specifier must be dependent"); 3771 3772 llvm::FoldingSetNodeID ID; 3773 DependentTemplateName::Profile(ID, NNS, Operator); 3774 3775 void *InsertPos = 0; 3776 DependentTemplateName *QTN = 3777 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3778 3779 if (QTN) 3780 return TemplateName(QTN); 3781 3782 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3783 if (CanonNNS == NNS) { 3784 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 3785 } else { 3786 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 3787 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 3788 } 3789 3790 DependentTemplateNames.InsertNode(QTN, InsertPos); 3791 return TemplateName(QTN); 3792} 3793 3794/// getFromTargetType - Given one of the integer types provided by 3795/// TargetInfo, produce the corresponding type. The unsigned @p Type 3796/// is actually a value of type @c TargetInfo::IntType. 3797CanQualType ASTContext::getFromTargetType(unsigned Type) const { 3798 switch (Type) { 3799 case TargetInfo::NoInt: return CanQualType(); 3800 case TargetInfo::SignedShort: return ShortTy; 3801 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3802 case TargetInfo::SignedInt: return IntTy; 3803 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3804 case TargetInfo::SignedLong: return LongTy; 3805 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3806 case TargetInfo::SignedLongLong: return LongLongTy; 3807 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3808 } 3809 3810 assert(false && "Unhandled TargetInfo::IntType value"); 3811 return CanQualType(); 3812} 3813 3814//===----------------------------------------------------------------------===// 3815// Type Predicates. 3816//===----------------------------------------------------------------------===// 3817 3818/// isObjCNSObjectType - Return true if this is an NSObject object using 3819/// NSObject attribute on a c-style pointer type. 3820/// FIXME - Make it work directly on types. 3821/// FIXME: Move to Type. 3822/// 3823bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3824 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3825 if (TypedefDecl *TD = TDT->getDecl()) 3826 if (TD->getAttr<ObjCNSObjectAttr>()) 3827 return true; 3828 } 3829 return false; 3830} 3831 3832/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3833/// garbage collection attribute. 3834/// 3835Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3836 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3837 if (getLangOptions().ObjC1 && 3838 getLangOptions().getGCMode() != LangOptions::NonGC) { 3839 GCAttrs = Ty.getObjCGCAttr(); 3840 // Default behavious under objective-c's gc is for objective-c pointers 3841 // (or pointers to them) be treated as though they were declared 3842 // as __strong. 3843 if (GCAttrs == Qualifiers::GCNone) { 3844 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3845 GCAttrs = Qualifiers::Strong; 3846 else if (Ty->isPointerType()) 3847 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3848 } 3849 // Non-pointers have none gc'able attribute regardless of the attribute 3850 // set on them. 3851 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3852 return Qualifiers::GCNone; 3853 } 3854 return GCAttrs; 3855} 3856 3857//===----------------------------------------------------------------------===// 3858// Type Compatibility Testing 3859//===----------------------------------------------------------------------===// 3860 3861/// areCompatVectorTypes - Return true if the two specified vector types are 3862/// compatible. 3863static bool areCompatVectorTypes(const VectorType *LHS, 3864 const VectorType *RHS) { 3865 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 3866 return LHS->getElementType() == RHS->getElementType() && 3867 LHS->getNumElements() == RHS->getNumElements(); 3868} 3869 3870//===----------------------------------------------------------------------===// 3871// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3872//===----------------------------------------------------------------------===// 3873 3874/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3875/// inheritance hierarchy of 'rProto'. 3876bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3877 ObjCProtocolDecl *rProto) { 3878 if (lProto == rProto) 3879 return true; 3880 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3881 E = rProto->protocol_end(); PI != E; ++PI) 3882 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3883 return true; 3884 return false; 3885} 3886 3887/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3888/// return true if lhs's protocols conform to rhs's protocol; false 3889/// otherwise. 3890bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3891 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3892 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3893 return false; 3894} 3895 3896/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3897/// ObjCQualifiedIDType. 3898bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3899 bool compare) { 3900 // Allow id<P..> and an 'id' or void* type in all cases. 3901 if (lhs->isVoidPointerType() || 3902 lhs->isObjCIdType() || lhs->isObjCClassType()) 3903 return true; 3904 else if (rhs->isVoidPointerType() || 3905 rhs->isObjCIdType() || rhs->isObjCClassType()) 3906 return true; 3907 3908 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3909 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3910 3911 if (!rhsOPT) return false; 3912 3913 if (rhsOPT->qual_empty()) { 3914 // If the RHS is a unqualified interface pointer "NSString*", 3915 // make sure we check the class hierarchy. 3916 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3917 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3918 E = lhsQID->qual_end(); I != E; ++I) { 3919 // when comparing an id<P> on lhs with a static type on rhs, 3920 // see if static class implements all of id's protocols, directly or 3921 // through its super class and categories. 3922 if (!rhsID->ClassImplementsProtocol(*I, true)) 3923 return false; 3924 } 3925 } 3926 // If there are no qualifiers and no interface, we have an 'id'. 3927 return true; 3928 } 3929 // Both the right and left sides have qualifiers. 3930 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3931 E = lhsQID->qual_end(); I != E; ++I) { 3932 ObjCProtocolDecl *lhsProto = *I; 3933 bool match = false; 3934 3935 // when comparing an id<P> on lhs with a static type on rhs, 3936 // see if static class implements all of id's protocols, directly or 3937 // through its super class and categories. 3938 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3939 E = rhsOPT->qual_end(); J != E; ++J) { 3940 ObjCProtocolDecl *rhsProto = *J; 3941 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3942 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3943 match = true; 3944 break; 3945 } 3946 } 3947 // If the RHS is a qualified interface pointer "NSString<P>*", 3948 // make sure we check the class hierarchy. 3949 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3950 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3951 E = lhsQID->qual_end(); I != E; ++I) { 3952 // when comparing an id<P> on lhs with a static type on rhs, 3953 // see if static class implements all of id's protocols, directly or 3954 // through its super class and categories. 3955 if (rhsID->ClassImplementsProtocol(*I, true)) { 3956 match = true; 3957 break; 3958 } 3959 } 3960 } 3961 if (!match) 3962 return false; 3963 } 3964 3965 return true; 3966 } 3967 3968 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3969 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3970 3971 if (const ObjCObjectPointerType *lhsOPT = 3972 lhs->getAsObjCInterfacePointerType()) { 3973 if (lhsOPT->qual_empty()) { 3974 bool match = false; 3975 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3976 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3977 E = rhsQID->qual_end(); I != E; ++I) { 3978 // when comparing an id<P> on lhs with a static type on rhs, 3979 // see if static class implements all of id's protocols, directly or 3980 // through its super class and categories. 3981 if (lhsID->ClassImplementsProtocol(*I, true)) { 3982 match = true; 3983 break; 3984 } 3985 } 3986 if (!match) 3987 return false; 3988 } 3989 return true; 3990 } 3991 // Both the right and left sides have qualifiers. 3992 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3993 E = lhsOPT->qual_end(); I != E; ++I) { 3994 ObjCProtocolDecl *lhsProto = *I; 3995 bool match = false; 3996 3997 // when comparing an id<P> on lhs with a static type on rhs, 3998 // see if static class implements all of id's protocols, directly or 3999 // through its super class and categories. 4000 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4001 E = rhsQID->qual_end(); J != E; ++J) { 4002 ObjCProtocolDecl *rhsProto = *J; 4003 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4004 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4005 match = true; 4006 break; 4007 } 4008 } 4009 if (!match) 4010 return false; 4011 } 4012 return true; 4013 } 4014 return false; 4015} 4016 4017/// canAssignObjCInterfaces - Return true if the two interface types are 4018/// compatible for assignment from RHS to LHS. This handles validation of any 4019/// protocol qualifiers on the LHS or RHS. 4020/// 4021bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4022 const ObjCObjectPointerType *RHSOPT) { 4023 // If either type represents the built-in 'id' or 'Class' types, return true. 4024 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 4025 return true; 4026 4027 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4028 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4029 QualType(RHSOPT,0), 4030 false); 4031 4032 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4033 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4034 if (LHS && RHS) // We have 2 user-defined types. 4035 return canAssignObjCInterfaces(LHS, RHS); 4036 4037 return false; 4038} 4039 4040/// getIntersectionOfProtocols - This routine finds the intersection of set 4041/// of protocols inherited from two distinct objective-c pointer objects. 4042/// It is used to build composite qualifier list of the composite type of 4043/// the conditional expression involving two objective-c pointer objects. 4044static 4045void getIntersectionOfProtocols(ASTContext &Context, 4046 const ObjCObjectPointerType *LHSOPT, 4047 const ObjCObjectPointerType *RHSOPT, 4048 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4049 4050 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4051 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4052 4053 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4054 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4055 if (LHSNumProtocols > 0) 4056 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4057 else { 4058 llvm::SmallVector<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4059 Context.CollectInheritedProtocols(LHS->getDecl(), LHSInheritedProtocols); 4060 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4061 LHSInheritedProtocols.end()); 4062 } 4063 4064 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4065 if (RHSNumProtocols > 0) { 4066 ObjCProtocolDecl **RHSProtocols = (ObjCProtocolDecl **)RHS->qual_begin(); 4067 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4068 if (InheritedProtocolSet.count(RHSProtocols[i])) 4069 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4070 } 4071 else { 4072 llvm::SmallVector<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4073 Context.CollectInheritedProtocols(RHS->getDecl(), RHSInheritedProtocols); 4074 // FIXME. This may cause duplication of protocols in the list, but should 4075 // be harmless. 4076 for (unsigned i = 0, len = RHSInheritedProtocols.size(); i < len; ++i) 4077 if (InheritedProtocolSet.count(RHSInheritedProtocols[i])) 4078 IntersectionOfProtocols.push_back(RHSInheritedProtocols[i]); 4079 } 4080} 4081 4082/// areCommonBaseCompatible - Returns common base class of the two classes if 4083/// one found. Note that this is O'2 algorithm. But it will be called as the 4084/// last type comparison in a ?-exp of ObjC pointer types before a 4085/// warning is issued. So, its invokation is extremely rare. 4086QualType ASTContext::areCommonBaseCompatible( 4087 const ObjCObjectPointerType *LHSOPT, 4088 const ObjCObjectPointerType *RHSOPT) { 4089 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4090 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4091 if (!LHS || !RHS) 4092 return QualType(); 4093 4094 while (const ObjCInterfaceDecl *LHSIDecl = LHS->getDecl()->getSuperClass()) { 4095 QualType LHSTy = getObjCInterfaceType(LHSIDecl); 4096 LHS = LHSTy->getAs<ObjCInterfaceType>(); 4097 if (canAssignObjCInterfaces(LHS, RHS)) { 4098 llvm::SmallVector<ObjCProtocolDecl *, 8> IntersectionOfProtocols; 4099 getIntersectionOfProtocols(*this, 4100 LHSOPT, RHSOPT, IntersectionOfProtocols); 4101 if (IntersectionOfProtocols.empty()) 4102 LHSTy = getObjCObjectPointerType(LHSTy); 4103 else 4104 LHSTy = getObjCObjectPointerType(LHSTy, &IntersectionOfProtocols[0], 4105 IntersectionOfProtocols.size()); 4106 return LHSTy; 4107 } 4108 } 4109 4110 return QualType(); 4111} 4112 4113bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 4114 const ObjCInterfaceType *RHS) { 4115 // Verify that the base decls are compatible: the RHS must be a subclass of 4116 // the LHS. 4117 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4118 return false; 4119 4120 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4121 // protocol qualified at all, then we are good. 4122 if (LHS->getNumProtocols() == 0) 4123 return true; 4124 4125 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4126 // isn't a superset. 4127 if (RHS->getNumProtocols() == 0) 4128 return true; // FIXME: should return false! 4129 4130 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 4131 LHSPE = LHS->qual_end(); 4132 LHSPI != LHSPE; LHSPI++) { 4133 bool RHSImplementsProtocol = false; 4134 4135 // If the RHS doesn't implement the protocol on the left, the types 4136 // are incompatible. 4137 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 4138 RHSPE = RHS->qual_end(); 4139 RHSPI != RHSPE; RHSPI++) { 4140 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4141 RHSImplementsProtocol = true; 4142 break; 4143 } 4144 } 4145 // FIXME: For better diagnostics, consider passing back the protocol name. 4146 if (!RHSImplementsProtocol) 4147 return false; 4148 } 4149 // The RHS implements all protocols listed on the LHS. 4150 return true; 4151} 4152 4153bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4154 // get the "pointed to" types 4155 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4156 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4157 4158 if (!LHSOPT || !RHSOPT) 4159 return false; 4160 4161 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4162 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4163} 4164 4165/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4166/// both shall have the identically qualified version of a compatible type. 4167/// C99 6.2.7p1: Two types have compatible types if their types are the 4168/// same. See 6.7.[2,3,5] for additional rules. 4169bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 4170 return !mergeTypes(LHS, RHS).isNull(); 4171} 4172 4173QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 4174 const FunctionType *lbase = lhs->getAs<FunctionType>(); 4175 const FunctionType *rbase = rhs->getAs<FunctionType>(); 4176 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 4177 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 4178 bool allLTypes = true; 4179 bool allRTypes = true; 4180 4181 // Check return type 4182 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 4183 if (retType.isNull()) return QualType(); 4184 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 4185 allLTypes = false; 4186 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 4187 allRTypes = false; 4188 // FIXME: double check this 4189 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 4190 if (NoReturn != lbase->getNoReturnAttr()) 4191 allLTypes = false; 4192 if (NoReturn != rbase->getNoReturnAttr()) 4193 allRTypes = false; 4194 4195 if (lproto && rproto) { // two C99 style function prototypes 4196 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 4197 "C++ shouldn't be here"); 4198 unsigned lproto_nargs = lproto->getNumArgs(); 4199 unsigned rproto_nargs = rproto->getNumArgs(); 4200 4201 // Compatible functions must have the same number of arguments 4202 if (lproto_nargs != rproto_nargs) 4203 return QualType(); 4204 4205 // Variadic and non-variadic functions aren't compatible 4206 if (lproto->isVariadic() != rproto->isVariadic()) 4207 return QualType(); 4208 4209 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 4210 return QualType(); 4211 4212 // Check argument compatibility 4213 llvm::SmallVector<QualType, 10> types; 4214 for (unsigned i = 0; i < lproto_nargs; i++) { 4215 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 4216 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 4217 QualType argtype = mergeTypes(largtype, rargtype); 4218 if (argtype.isNull()) return QualType(); 4219 types.push_back(argtype); 4220 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 4221 allLTypes = false; 4222 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 4223 allRTypes = false; 4224 } 4225 if (allLTypes) return lhs; 4226 if (allRTypes) return rhs; 4227 return getFunctionType(retType, types.begin(), types.size(), 4228 lproto->isVariadic(), lproto->getTypeQuals(), 4229 NoReturn); 4230 } 4231 4232 if (lproto) allRTypes = false; 4233 if (rproto) allLTypes = false; 4234 4235 const FunctionProtoType *proto = lproto ? lproto : rproto; 4236 if (proto) { 4237 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 4238 if (proto->isVariadic()) return QualType(); 4239 // Check that the types are compatible with the types that 4240 // would result from default argument promotions (C99 6.7.5.3p15). 4241 // The only types actually affected are promotable integer 4242 // types and floats, which would be passed as a different 4243 // type depending on whether the prototype is visible. 4244 unsigned proto_nargs = proto->getNumArgs(); 4245 for (unsigned i = 0; i < proto_nargs; ++i) { 4246 QualType argTy = proto->getArgType(i); 4247 if (argTy->isPromotableIntegerType() || 4248 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 4249 return QualType(); 4250 } 4251 4252 if (allLTypes) return lhs; 4253 if (allRTypes) return rhs; 4254 return getFunctionType(retType, proto->arg_type_begin(), 4255 proto->getNumArgs(), proto->isVariadic(), 4256 proto->getTypeQuals(), NoReturn); 4257 } 4258 4259 if (allLTypes) return lhs; 4260 if (allRTypes) return rhs; 4261 return getFunctionNoProtoType(retType, NoReturn); 4262} 4263 4264QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 4265 // C++ [expr]: If an expression initially has the type "reference to T", the 4266 // type is adjusted to "T" prior to any further analysis, the expression 4267 // designates the object or function denoted by the reference, and the 4268 // expression is an lvalue unless the reference is an rvalue reference and 4269 // the expression is a function call (possibly inside parentheses). 4270 // FIXME: C++ shouldn't be going through here! The rules are different 4271 // enough that they should be handled separately. 4272 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 4273 // shouldn't be going through here! 4274 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 4275 LHS = RT->getPointeeType(); 4276 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 4277 RHS = RT->getPointeeType(); 4278 4279 QualType LHSCan = getCanonicalType(LHS), 4280 RHSCan = getCanonicalType(RHS); 4281 4282 // If two types are identical, they are compatible. 4283 if (LHSCan == RHSCan) 4284 return LHS; 4285 4286 // If the qualifiers are different, the types aren't compatible... mostly. 4287 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 4288 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 4289 if (LQuals != RQuals) { 4290 // If any of these qualifiers are different, we have a type 4291 // mismatch. 4292 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 4293 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 4294 return QualType(); 4295 4296 // Exactly one GC qualifier difference is allowed: __strong is 4297 // okay if the other type has no GC qualifier but is an Objective 4298 // C object pointer (i.e. implicitly strong by default). We fix 4299 // this by pretending that the unqualified type was actually 4300 // qualified __strong. 4301 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 4302 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 4303 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 4304 4305 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 4306 return QualType(); 4307 4308 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 4309 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 4310 } 4311 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 4312 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 4313 } 4314 return QualType(); 4315 } 4316 4317 // Okay, qualifiers are equal. 4318 4319 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 4320 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 4321 4322 // We want to consider the two function types to be the same for these 4323 // comparisons, just force one to the other. 4324 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 4325 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 4326 4327 // Same as above for arrays 4328 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 4329 LHSClass = Type::ConstantArray; 4330 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 4331 RHSClass = Type::ConstantArray; 4332 4333 // Canonicalize ExtVector -> Vector. 4334 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 4335 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 4336 4337 // If the canonical type classes don't match. 4338 if (LHSClass != RHSClass) { 4339 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 4340 // a signed integer type, or an unsigned integer type. 4341 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 4342 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 4343 return RHS; 4344 } 4345 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 4346 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 4347 return LHS; 4348 } 4349 4350 return QualType(); 4351 } 4352 4353 // The canonical type classes match. 4354 switch (LHSClass) { 4355#define TYPE(Class, Base) 4356#define ABSTRACT_TYPE(Class, Base) 4357#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4358#define DEPENDENT_TYPE(Class, Base) case Type::Class: 4359#include "clang/AST/TypeNodes.def" 4360 assert(false && "Non-canonical and dependent types shouldn't get here"); 4361 return QualType(); 4362 4363 case Type::LValueReference: 4364 case Type::RValueReference: 4365 case Type::MemberPointer: 4366 assert(false && "C++ should never be in mergeTypes"); 4367 return QualType(); 4368 4369 case Type::IncompleteArray: 4370 case Type::VariableArray: 4371 case Type::FunctionProto: 4372 case Type::ExtVector: 4373 assert(false && "Types are eliminated above"); 4374 return QualType(); 4375 4376 case Type::Pointer: 4377 { 4378 // Merge two pointer types, while trying to preserve typedef info 4379 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 4380 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 4381 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4382 if (ResultType.isNull()) return QualType(); 4383 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4384 return LHS; 4385 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4386 return RHS; 4387 return getPointerType(ResultType); 4388 } 4389 case Type::BlockPointer: 4390 { 4391 // Merge two block pointer types, while trying to preserve typedef info 4392 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 4393 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 4394 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4395 if (ResultType.isNull()) return QualType(); 4396 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4397 return LHS; 4398 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4399 return RHS; 4400 return getBlockPointerType(ResultType); 4401 } 4402 case Type::ConstantArray: 4403 { 4404 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 4405 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 4406 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 4407 return QualType(); 4408 4409 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 4410 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 4411 QualType ResultType = mergeTypes(LHSElem, RHSElem); 4412 if (ResultType.isNull()) return QualType(); 4413 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4414 return LHS; 4415 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4416 return RHS; 4417 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 4418 ArrayType::ArraySizeModifier(), 0); 4419 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 4420 ArrayType::ArraySizeModifier(), 0); 4421 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 4422 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 4423 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4424 return LHS; 4425 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4426 return RHS; 4427 if (LVAT) { 4428 // FIXME: This isn't correct! But tricky to implement because 4429 // the array's size has to be the size of LHS, but the type 4430 // has to be different. 4431 return LHS; 4432 } 4433 if (RVAT) { 4434 // FIXME: This isn't correct! But tricky to implement because 4435 // the array's size has to be the size of RHS, but the type 4436 // has to be different. 4437 return RHS; 4438 } 4439 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4440 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4441 return getIncompleteArrayType(ResultType, 4442 ArrayType::ArraySizeModifier(), 0); 4443 } 4444 case Type::FunctionNoProto: 4445 return mergeFunctionTypes(LHS, RHS); 4446 case Type::Record: 4447 case Type::Enum: 4448 return QualType(); 4449 case Type::Builtin: 4450 // Only exactly equal builtin types are compatible, which is tested above. 4451 return QualType(); 4452 case Type::Complex: 4453 // Distinct complex types are incompatible. 4454 return QualType(); 4455 case Type::Vector: 4456 // FIXME: The merged type should be an ExtVector! 4457 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 4458 return LHS; 4459 return QualType(); 4460 case Type::ObjCInterface: { 4461 // Check if the interfaces are assignment compatible. 4462 // FIXME: This should be type compatibility, e.g. whether 4463 // "LHS x; RHS x;" at global scope is legal. 4464 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 4465 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 4466 if (LHSIface && RHSIface && 4467 canAssignObjCInterfaces(LHSIface, RHSIface)) 4468 return LHS; 4469 4470 return QualType(); 4471 } 4472 case Type::ObjCObjectPointer: { 4473 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4474 RHS->getAs<ObjCObjectPointerType>())) 4475 return LHS; 4476 4477 return QualType(); 4478 } 4479 case Type::FixedWidthInt: 4480 // Distinct fixed-width integers are not compatible. 4481 return QualType(); 4482 case Type::TemplateSpecialization: 4483 assert(false && "Dependent types have no size"); 4484 break; 4485 } 4486 4487 return QualType(); 4488} 4489 4490//===----------------------------------------------------------------------===// 4491// Integer Predicates 4492//===----------------------------------------------------------------------===// 4493 4494unsigned ASTContext::getIntWidth(QualType T) { 4495 if (T->isBooleanType()) 4496 return 1; 4497 if (FixedWidthIntType *FWIT = dyn_cast<FixedWidthIntType>(T)) { 4498 return FWIT->getWidth(); 4499 } 4500 // For builtin types, just use the standard type sizing method 4501 return (unsigned)getTypeSize(T); 4502} 4503 4504QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4505 assert(T->isSignedIntegerType() && "Unexpected type"); 4506 4507 // Turn <4 x signed int> -> <4 x unsigned int> 4508 if (const VectorType *VTy = T->getAs<VectorType>()) 4509 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4510 VTy->getNumElements()); 4511 4512 // For enums, we return the unsigned version of the base type. 4513 if (const EnumType *ETy = T->getAs<EnumType>()) 4514 T = ETy->getDecl()->getIntegerType(); 4515 4516 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4517 assert(BTy && "Unexpected signed integer type"); 4518 switch (BTy->getKind()) { 4519 case BuiltinType::Char_S: 4520 case BuiltinType::SChar: 4521 return UnsignedCharTy; 4522 case BuiltinType::Short: 4523 return UnsignedShortTy; 4524 case BuiltinType::Int: 4525 return UnsignedIntTy; 4526 case BuiltinType::Long: 4527 return UnsignedLongTy; 4528 case BuiltinType::LongLong: 4529 return UnsignedLongLongTy; 4530 case BuiltinType::Int128: 4531 return UnsignedInt128Ty; 4532 default: 4533 assert(0 && "Unexpected signed integer type"); 4534 return QualType(); 4535 } 4536} 4537 4538ExternalASTSource::~ExternalASTSource() { } 4539 4540void ExternalASTSource::PrintStats() { } 4541 4542 4543//===----------------------------------------------------------------------===// 4544// Builtin Type Computation 4545//===----------------------------------------------------------------------===// 4546 4547/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4548/// pointer over the consumed characters. This returns the resultant type. 4549static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4550 ASTContext::GetBuiltinTypeError &Error, 4551 bool AllowTypeModifiers = true) { 4552 // Modifiers. 4553 int HowLong = 0; 4554 bool Signed = false, Unsigned = false; 4555 4556 // Read the modifiers first. 4557 bool Done = false; 4558 while (!Done) { 4559 switch (*Str++) { 4560 default: Done = true; --Str; break; 4561 case 'S': 4562 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4563 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4564 Signed = true; 4565 break; 4566 case 'U': 4567 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4568 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4569 Unsigned = true; 4570 break; 4571 case 'L': 4572 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4573 ++HowLong; 4574 break; 4575 } 4576 } 4577 4578 QualType Type; 4579 4580 // Read the base type. 4581 switch (*Str++) { 4582 default: assert(0 && "Unknown builtin type letter!"); 4583 case 'v': 4584 assert(HowLong == 0 && !Signed && !Unsigned && 4585 "Bad modifiers used with 'v'!"); 4586 Type = Context.VoidTy; 4587 break; 4588 case 'f': 4589 assert(HowLong == 0 && !Signed && !Unsigned && 4590 "Bad modifiers used with 'f'!"); 4591 Type = Context.FloatTy; 4592 break; 4593 case 'd': 4594 assert(HowLong < 2 && !Signed && !Unsigned && 4595 "Bad modifiers used with 'd'!"); 4596 if (HowLong) 4597 Type = Context.LongDoubleTy; 4598 else 4599 Type = Context.DoubleTy; 4600 break; 4601 case 's': 4602 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4603 if (Unsigned) 4604 Type = Context.UnsignedShortTy; 4605 else 4606 Type = Context.ShortTy; 4607 break; 4608 case 'i': 4609 if (HowLong == 3) 4610 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4611 else if (HowLong == 2) 4612 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4613 else if (HowLong == 1) 4614 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4615 else 4616 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4617 break; 4618 case 'c': 4619 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4620 if (Signed) 4621 Type = Context.SignedCharTy; 4622 else if (Unsigned) 4623 Type = Context.UnsignedCharTy; 4624 else 4625 Type = Context.CharTy; 4626 break; 4627 case 'b': // boolean 4628 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4629 Type = Context.BoolTy; 4630 break; 4631 case 'z': // size_t. 4632 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4633 Type = Context.getSizeType(); 4634 break; 4635 case 'F': 4636 Type = Context.getCFConstantStringType(); 4637 break; 4638 case 'a': 4639 Type = Context.getBuiltinVaListType(); 4640 assert(!Type.isNull() && "builtin va list type not initialized!"); 4641 break; 4642 case 'A': 4643 // This is a "reference" to a va_list; however, what exactly 4644 // this means depends on how va_list is defined. There are two 4645 // different kinds of va_list: ones passed by value, and ones 4646 // passed by reference. An example of a by-value va_list is 4647 // x86, where va_list is a char*. An example of by-ref va_list 4648 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4649 // we want this argument to be a char*&; for x86-64, we want 4650 // it to be a __va_list_tag*. 4651 Type = Context.getBuiltinVaListType(); 4652 assert(!Type.isNull() && "builtin va list type not initialized!"); 4653 if (Type->isArrayType()) { 4654 Type = Context.getArrayDecayedType(Type); 4655 } else { 4656 Type = Context.getLValueReferenceType(Type); 4657 } 4658 break; 4659 case 'V': { 4660 char *End; 4661 unsigned NumElements = strtoul(Str, &End, 10); 4662 assert(End != Str && "Missing vector size"); 4663 4664 Str = End; 4665 4666 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4667 Type = Context.getVectorType(ElementType, NumElements); 4668 break; 4669 } 4670 case 'X': { 4671 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4672 Type = Context.getComplexType(ElementType); 4673 break; 4674 } 4675 case 'P': 4676 Type = Context.getFILEType(); 4677 if (Type.isNull()) { 4678 Error = ASTContext::GE_Missing_stdio; 4679 return QualType(); 4680 } 4681 break; 4682 case 'J': 4683 if (Signed) 4684 Type = Context.getsigjmp_bufType(); 4685 else 4686 Type = Context.getjmp_bufType(); 4687 4688 if (Type.isNull()) { 4689 Error = ASTContext::GE_Missing_setjmp; 4690 return QualType(); 4691 } 4692 break; 4693 } 4694 4695 if (!AllowTypeModifiers) 4696 return Type; 4697 4698 Done = false; 4699 while (!Done) { 4700 switch (*Str++) { 4701 default: Done = true; --Str; break; 4702 case '*': 4703 Type = Context.getPointerType(Type); 4704 break; 4705 case '&': 4706 Type = Context.getLValueReferenceType(Type); 4707 break; 4708 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4709 case 'C': 4710 Type = Type.withConst(); 4711 break; 4712 } 4713 } 4714 4715 return Type; 4716} 4717 4718/// GetBuiltinType - Return the type for the specified builtin. 4719QualType ASTContext::GetBuiltinType(unsigned id, 4720 GetBuiltinTypeError &Error) { 4721 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4722 4723 llvm::SmallVector<QualType, 8> ArgTypes; 4724 4725 Error = GE_None; 4726 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4727 if (Error != GE_None) 4728 return QualType(); 4729 while (TypeStr[0] && TypeStr[0] != '.') { 4730 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4731 if (Error != GE_None) 4732 return QualType(); 4733 4734 // Do array -> pointer decay. The builtin should use the decayed type. 4735 if (Ty->isArrayType()) 4736 Ty = getArrayDecayedType(Ty); 4737 4738 ArgTypes.push_back(Ty); 4739 } 4740 4741 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4742 "'.' should only occur at end of builtin type list!"); 4743 4744 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4745 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4746 return getFunctionNoProtoType(ResType); 4747 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4748 TypeStr[0] == '.', 0); 4749} 4750 4751QualType 4752ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4753 // Perform the usual unary conversions. We do this early so that 4754 // integral promotions to "int" can allow us to exit early, in the 4755 // lhs == rhs check. Also, for conversion purposes, we ignore any 4756 // qualifiers. For example, "const float" and "float" are 4757 // equivalent. 4758 if (lhs->isPromotableIntegerType()) 4759 lhs = getPromotedIntegerType(lhs); 4760 else 4761 lhs = lhs.getUnqualifiedType(); 4762 if (rhs->isPromotableIntegerType()) 4763 rhs = getPromotedIntegerType(rhs); 4764 else 4765 rhs = rhs.getUnqualifiedType(); 4766 4767 // If both types are identical, no conversion is needed. 4768 if (lhs == rhs) 4769 return lhs; 4770 4771 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4772 // The caller can deal with this (e.g. pointer + int). 4773 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4774 return lhs; 4775 4776 // At this point, we have two different arithmetic types. 4777 4778 // Handle complex types first (C99 6.3.1.8p1). 4779 if (lhs->isComplexType() || rhs->isComplexType()) { 4780 // if we have an integer operand, the result is the complex type. 4781 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4782 // convert the rhs to the lhs complex type. 4783 return lhs; 4784 } 4785 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4786 // convert the lhs to the rhs complex type. 4787 return rhs; 4788 } 4789 // This handles complex/complex, complex/float, or float/complex. 4790 // When both operands are complex, the shorter operand is converted to the 4791 // type of the longer, and that is the type of the result. This corresponds 4792 // to what is done when combining two real floating-point operands. 4793 // The fun begins when size promotion occur across type domains. 4794 // From H&S 6.3.4: When one operand is complex and the other is a real 4795 // floating-point type, the less precise type is converted, within it's 4796 // real or complex domain, to the precision of the other type. For example, 4797 // when combining a "long double" with a "double _Complex", the 4798 // "double _Complex" is promoted to "long double _Complex". 4799 int result = getFloatingTypeOrder(lhs, rhs); 4800 4801 if (result > 0) { // The left side is bigger, convert rhs. 4802 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4803 } else if (result < 0) { // The right side is bigger, convert lhs. 4804 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4805 } 4806 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4807 // domains match. This is a requirement for our implementation, C99 4808 // does not require this promotion. 4809 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4810 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4811 return rhs; 4812 } else { // handle "_Complex double, double". 4813 return lhs; 4814 } 4815 } 4816 return lhs; // The domain/size match exactly. 4817 } 4818 // Now handle "real" floating types (i.e. float, double, long double). 4819 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4820 // if we have an integer operand, the result is the real floating type. 4821 if (rhs->isIntegerType()) { 4822 // convert rhs to the lhs floating point type. 4823 return lhs; 4824 } 4825 if (rhs->isComplexIntegerType()) { 4826 // convert rhs to the complex floating point type. 4827 return getComplexType(lhs); 4828 } 4829 if (lhs->isIntegerType()) { 4830 // convert lhs to the rhs floating point type. 4831 return rhs; 4832 } 4833 if (lhs->isComplexIntegerType()) { 4834 // convert lhs to the complex floating point type. 4835 return getComplexType(rhs); 4836 } 4837 // We have two real floating types, float/complex combos were handled above. 4838 // Convert the smaller operand to the bigger result. 4839 int result = getFloatingTypeOrder(lhs, rhs); 4840 if (result > 0) // convert the rhs 4841 return lhs; 4842 assert(result < 0 && "illegal float comparison"); 4843 return rhs; // convert the lhs 4844 } 4845 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4846 // Handle GCC complex int extension. 4847 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4848 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4849 4850 if (lhsComplexInt && rhsComplexInt) { 4851 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4852 rhsComplexInt->getElementType()) >= 0) 4853 return lhs; // convert the rhs 4854 return rhs; 4855 } else if (lhsComplexInt && rhs->isIntegerType()) { 4856 // convert the rhs to the lhs complex type. 4857 return lhs; 4858 } else if (rhsComplexInt && lhs->isIntegerType()) { 4859 // convert the lhs to the rhs complex type. 4860 return rhs; 4861 } 4862 } 4863 // Finally, we have two differing integer types. 4864 // The rules for this case are in C99 6.3.1.8 4865 int compare = getIntegerTypeOrder(lhs, rhs); 4866 bool lhsSigned = lhs->isSignedIntegerType(), 4867 rhsSigned = rhs->isSignedIntegerType(); 4868 QualType destType; 4869 if (lhsSigned == rhsSigned) { 4870 // Same signedness; use the higher-ranked type 4871 destType = compare >= 0 ? lhs : rhs; 4872 } else if (compare != (lhsSigned ? 1 : -1)) { 4873 // The unsigned type has greater than or equal rank to the 4874 // signed type, so use the unsigned type 4875 destType = lhsSigned ? rhs : lhs; 4876 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4877 // The two types are different widths; if we are here, that 4878 // means the signed type is larger than the unsigned type, so 4879 // use the signed type. 4880 destType = lhsSigned ? lhs : rhs; 4881 } else { 4882 // The signed type is higher-ranked than the unsigned type, 4883 // but isn't actually any bigger (like unsigned int and long 4884 // on most 32-bit systems). Use the unsigned type corresponding 4885 // to the signed type. 4886 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4887 } 4888 return destType; 4889} 4890