ASTContext.cpp revision 46a617a792bfab0d9b1e057371ea3b9540802226
1//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclCXX.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/TypeLoc.h" 19#include "clang/AST/Expr.h" 20#include "clang/AST/ExternalASTSource.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/Basic/Builtins.h" 23#include "clang/Basic/SourceManager.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/ADT/StringExtras.h" 26#include "llvm/Support/MathExtras.h" 27#include "llvm/Support/MemoryBuffer.h" 28#include "RecordLayoutBuilder.h" 29 30using namespace clang; 31 32enum FloatingRank { 33 FloatRank, DoubleRank, LongDoubleRank 34}; 35 36ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 37 TargetInfo &t, 38 IdentifierTable &idents, SelectorTable &sels, 39 Builtin::Context &builtins, 40 bool FreeMem, unsigned size_reserve) : 41 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 42 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 43 sigjmp_bufDecl(0), SourceMgr(SM), LangOpts(LOpts), 44 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 45 Idents(idents), Selectors(sels), 46 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 47 ObjCIdRedefinitionType = QualType(); 48 ObjCClassRedefinitionType = QualType(); 49 if (size_reserve > 0) Types.reserve(size_reserve); 50 TUDecl = TranslationUnitDecl::Create(*this); 51 InitBuiltinTypes(); 52} 53 54ASTContext::~ASTContext() { 55 // Deallocate all the types. 56 while (!Types.empty()) { 57 Types.back()->Destroy(*this); 58 Types.pop_back(); 59 } 60 61 { 62 llvm::FoldingSet<ExtQuals>::iterator 63 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); 64 while (I != E) 65 Deallocate(&*I++); 66 } 67 68 { 69 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 70 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 71 while (I != E) { 72 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 73 delete R; 74 } 75 } 76 77 { 78 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 79 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 80 while (I != E) { 81 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 82 delete R; 83 } 84 } 85 86 // Destroy nested-name-specifiers. 87 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 88 NNS = NestedNameSpecifiers.begin(), 89 NNSEnd = NestedNameSpecifiers.end(); 90 NNS != NNSEnd; 91 /* Increment in loop */) 92 (*NNS++).Destroy(*this); 93 94 if (GlobalNestedNameSpecifier) 95 GlobalNestedNameSpecifier->Destroy(*this); 96 97 TUDecl->Destroy(*this); 98} 99 100void 101ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 102 ExternalSource.reset(Source.take()); 103} 104 105void ASTContext::PrintStats() const { 106 fprintf(stderr, "*** AST Context Stats:\n"); 107 fprintf(stderr, " %d types total.\n", (int)Types.size()); 108 109 unsigned counts[] = { 110#define TYPE(Name, Parent) 0, 111#define ABSTRACT_TYPE(Name, Parent) 112#include "clang/AST/TypeNodes.def" 113 0 // Extra 114 }; 115 116 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 117 Type *T = Types[i]; 118 counts[(unsigned)T->getTypeClass()]++; 119 } 120 121 unsigned Idx = 0; 122 unsigned TotalBytes = 0; 123#define TYPE(Name, Parent) \ 124 if (counts[Idx]) \ 125 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 126 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 127 ++Idx; 128#define ABSTRACT_TYPE(Name, Parent) 129#include "clang/AST/TypeNodes.def" 130 131 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 132 133 if (ExternalSource.get()) { 134 fprintf(stderr, "\n"); 135 ExternalSource->PrintStats(); 136 } 137} 138 139 140void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 141 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 142 R = QualType(Ty, 0); 143 Types.push_back(Ty); 144} 145 146void ASTContext::InitBuiltinTypes() { 147 assert(VoidTy.isNull() && "Context reinitialized?"); 148 149 // C99 6.2.5p19. 150 InitBuiltinType(VoidTy, BuiltinType::Void); 151 152 // C99 6.2.5p2. 153 InitBuiltinType(BoolTy, BuiltinType::Bool); 154 // C99 6.2.5p3. 155 if (LangOpts.CharIsSigned) 156 InitBuiltinType(CharTy, BuiltinType::Char_S); 157 else 158 InitBuiltinType(CharTy, BuiltinType::Char_U); 159 // C99 6.2.5p4. 160 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 161 InitBuiltinType(ShortTy, BuiltinType::Short); 162 InitBuiltinType(IntTy, BuiltinType::Int); 163 InitBuiltinType(LongTy, BuiltinType::Long); 164 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 165 166 // C99 6.2.5p6. 167 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 168 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 169 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 170 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 171 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 172 173 // C99 6.2.5p10. 174 InitBuiltinType(FloatTy, BuiltinType::Float); 175 InitBuiltinType(DoubleTy, BuiltinType::Double); 176 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 177 178 // GNU extension, 128-bit integers. 179 InitBuiltinType(Int128Ty, BuiltinType::Int128); 180 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 181 182 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 183 InitBuiltinType(WCharTy, BuiltinType::WChar); 184 else // C99 185 WCharTy = getFromTargetType(Target.getWCharType()); 186 187 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 188 InitBuiltinType(Char16Ty, BuiltinType::Char16); 189 else // C99 190 Char16Ty = getFromTargetType(Target.getChar16Type()); 191 192 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 193 InitBuiltinType(Char32Ty, BuiltinType::Char32); 194 else // C99 195 Char32Ty = getFromTargetType(Target.getChar32Type()); 196 197 // Placeholder type for functions. 198 InitBuiltinType(OverloadTy, BuiltinType::Overload); 199 200 // Placeholder type for type-dependent expressions whose type is 201 // completely unknown. No code should ever check a type against 202 // DependentTy and users should never see it; however, it is here to 203 // help diagnose failures to properly check for type-dependent 204 // expressions. 205 InitBuiltinType(DependentTy, BuiltinType::Dependent); 206 207 // Placeholder type for C++0x auto declarations whose real type has 208 // not yet been deduced. 209 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 210 211 // C99 6.2.5p11. 212 FloatComplexTy = getComplexType(FloatTy); 213 DoubleComplexTy = getComplexType(DoubleTy); 214 LongDoubleComplexTy = getComplexType(LongDoubleTy); 215 216 BuiltinVaListType = QualType(); 217 218 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 219 ObjCIdTypedefType = QualType(); 220 ObjCClassTypedefType = QualType(); 221 222 // Builtin types for 'id' and 'Class'. 223 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 224 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 225 226 ObjCConstantStringType = QualType(); 227 228 // void * type 229 VoidPtrTy = getPointerType(VoidTy); 230 231 // nullptr type (C++0x 2.14.7) 232 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 233} 234 235MemberSpecializationInfo * 236ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 237 assert(Var->isStaticDataMember() && "Not a static data member"); 238 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 239 = InstantiatedFromStaticDataMember.find(Var); 240 if (Pos == InstantiatedFromStaticDataMember.end()) 241 return 0; 242 243 return Pos->second; 244} 245 246void 247ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 248 TemplateSpecializationKind TSK) { 249 assert(Inst->isStaticDataMember() && "Not a static data member"); 250 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 251 assert(!InstantiatedFromStaticDataMember[Inst] && 252 "Already noted what static data member was instantiated from"); 253 InstantiatedFromStaticDataMember[Inst] 254 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 255} 256 257UnresolvedUsingDecl * 258ASTContext::getInstantiatedFromUnresolvedUsingDecl(UsingDecl *UUD) { 259 llvm::DenseMap<UsingDecl *, UnresolvedUsingDecl *>::iterator Pos 260 = InstantiatedFromUnresolvedUsingDecl.find(UUD); 261 if (Pos == InstantiatedFromUnresolvedUsingDecl.end()) 262 return 0; 263 264 return Pos->second; 265} 266 267void 268ASTContext::setInstantiatedFromUnresolvedUsingDecl(UsingDecl *UD, 269 UnresolvedUsingDecl *UUD) { 270 assert(!InstantiatedFromUnresolvedUsingDecl[UD] && 271 "Already noted what using decl what instantiated from"); 272 InstantiatedFromUnresolvedUsingDecl[UD] = UUD; 273} 274 275FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 276 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 277 = InstantiatedFromUnnamedFieldDecl.find(Field); 278 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 279 return 0; 280 281 return Pos->second; 282} 283 284void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 285 FieldDecl *Tmpl) { 286 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 287 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 288 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 289 "Already noted what unnamed field was instantiated from"); 290 291 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 292} 293 294namespace { 295 class BeforeInTranslationUnit 296 : std::binary_function<SourceRange, SourceRange, bool> { 297 SourceManager *SourceMgr; 298 299 public: 300 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 301 302 bool operator()(SourceRange X, SourceRange Y) { 303 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 304 } 305 }; 306} 307 308/// \brief Determine whether the given comment is a Doxygen-style comment. 309/// 310/// \param Start the start of the comment text. 311/// 312/// \param End the end of the comment text. 313/// 314/// \param Member whether we want to check whether this is a member comment 315/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 316/// we only return true when we find a non-member comment. 317static bool 318isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 319 bool Member = false) { 320 const char *BufferStart 321 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 322 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 323 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 324 325 if (End - Start < 4) 326 return false; 327 328 assert(Start[0] == '/' && "Not a comment?"); 329 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 330 return false; 331 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 332 return false; 333 334 return (Start[3] == '<') == Member; 335} 336 337/// \brief Retrieve the comment associated with the given declaration, if 338/// it has one. 339const char *ASTContext::getCommentForDecl(const Decl *D) { 340 if (!D) 341 return 0; 342 343 // Check whether we have cached a comment string for this declaration 344 // already. 345 llvm::DenseMap<const Decl *, std::string>::iterator Pos 346 = DeclComments.find(D); 347 if (Pos != DeclComments.end()) 348 return Pos->second.c_str(); 349 350 // If we have an external AST source and have not yet loaded comments from 351 // that source, do so now. 352 if (ExternalSource && !LoadedExternalComments) { 353 std::vector<SourceRange> LoadedComments; 354 ExternalSource->ReadComments(LoadedComments); 355 356 if (!LoadedComments.empty()) 357 Comments.insert(Comments.begin(), LoadedComments.begin(), 358 LoadedComments.end()); 359 360 LoadedExternalComments = true; 361 } 362 363 // If there are no comments anywhere, we won't find anything. 364 if (Comments.empty()) 365 return 0; 366 367 // If the declaration doesn't map directly to a location in a file, we 368 // can't find the comment. 369 SourceLocation DeclStartLoc = D->getLocStart(); 370 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 371 return 0; 372 373 // Find the comment that occurs just before this declaration. 374 std::vector<SourceRange>::iterator LastComment 375 = std::lower_bound(Comments.begin(), Comments.end(), 376 SourceRange(DeclStartLoc), 377 BeforeInTranslationUnit(&SourceMgr)); 378 379 // Decompose the location for the start of the declaration and find the 380 // beginning of the file buffer. 381 std::pair<FileID, unsigned> DeclStartDecomp 382 = SourceMgr.getDecomposedLoc(DeclStartLoc); 383 const char *FileBufferStart 384 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 385 386 // First check whether we have a comment for a member. 387 if (LastComment != Comments.end() && 388 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 389 isDoxygenComment(SourceMgr, *LastComment, true)) { 390 std::pair<FileID, unsigned> LastCommentEndDecomp 391 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 392 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 393 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 394 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 395 LastCommentEndDecomp.second)) { 396 // The Doxygen member comment comes after the declaration starts and 397 // is on the same line and in the same file as the declaration. This 398 // is the comment we want. 399 std::string &Result = DeclComments[D]; 400 Result.append(FileBufferStart + 401 SourceMgr.getFileOffset(LastComment->getBegin()), 402 FileBufferStart + LastCommentEndDecomp.second + 1); 403 return Result.c_str(); 404 } 405 } 406 407 if (LastComment == Comments.begin()) 408 return 0; 409 --LastComment; 410 411 // Decompose the end of the comment. 412 std::pair<FileID, unsigned> LastCommentEndDecomp 413 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 414 415 // If the comment and the declaration aren't in the same file, then they 416 // aren't related. 417 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 418 return 0; 419 420 // Check that we actually have a Doxygen comment. 421 if (!isDoxygenComment(SourceMgr, *LastComment)) 422 return 0; 423 424 // Compute the starting line for the declaration and for the end of the 425 // comment (this is expensive). 426 unsigned DeclStartLine 427 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 428 unsigned CommentEndLine 429 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 430 LastCommentEndDecomp.second); 431 432 // If the comment does not end on the line prior to the declaration, then 433 // the comment is not associated with the declaration at all. 434 if (CommentEndLine + 1 != DeclStartLine) 435 return 0; 436 437 // We have a comment, but there may be more comments on the previous lines. 438 // Keep looking so long as the comments are still Doxygen comments and are 439 // still adjacent. 440 unsigned ExpectedLine 441 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 442 std::vector<SourceRange>::iterator FirstComment = LastComment; 443 while (FirstComment != Comments.begin()) { 444 // Look at the previous comment 445 --FirstComment; 446 std::pair<FileID, unsigned> Decomp 447 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 448 449 // If this previous comment is in a different file, we're done. 450 if (Decomp.first != DeclStartDecomp.first) { 451 ++FirstComment; 452 break; 453 } 454 455 // If this comment is not a Doxygen comment, we're done. 456 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 457 ++FirstComment; 458 break; 459 } 460 461 // If the line number is not what we expected, we're done. 462 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 463 if (Line != ExpectedLine) { 464 ++FirstComment; 465 break; 466 } 467 468 // Set the next expected line number. 469 ExpectedLine 470 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 471 } 472 473 // The iterator range [FirstComment, LastComment] contains all of the 474 // BCPL comments that, together, are associated with this declaration. 475 // Form a single comment block string for this declaration that concatenates 476 // all of these comments. 477 std::string &Result = DeclComments[D]; 478 while (FirstComment != LastComment) { 479 std::pair<FileID, unsigned> DecompStart 480 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 481 std::pair<FileID, unsigned> DecompEnd 482 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 483 Result.append(FileBufferStart + DecompStart.second, 484 FileBufferStart + DecompEnd.second + 1); 485 ++FirstComment; 486 } 487 488 // Append the last comment line. 489 Result.append(FileBufferStart + 490 SourceMgr.getFileOffset(LastComment->getBegin()), 491 FileBufferStart + LastCommentEndDecomp.second + 1); 492 return Result.c_str(); 493} 494 495//===----------------------------------------------------------------------===// 496// Type Sizing and Analysis 497//===----------------------------------------------------------------------===// 498 499/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 500/// scalar floating point type. 501const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 502 const BuiltinType *BT = T->getAs<BuiltinType>(); 503 assert(BT && "Not a floating point type!"); 504 switch (BT->getKind()) { 505 default: assert(0 && "Not a floating point type!"); 506 case BuiltinType::Float: return Target.getFloatFormat(); 507 case BuiltinType::Double: return Target.getDoubleFormat(); 508 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 509 } 510} 511 512/// getDeclAlignInBytes - Return a conservative estimate of the alignment of the 513/// specified decl. Note that bitfields do not have a valid alignment, so 514/// this method will assert on them. 515unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 516 unsigned Align = Target.getCharWidth(); 517 518 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 519 Align = std::max(Align, AA->getAlignment()); 520 521 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 522 QualType T = VD->getType(); 523 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 524 unsigned AS = RT->getPointeeType().getAddressSpace(); 525 Align = Target.getPointerAlign(AS); 526 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 527 // Incomplete or function types default to 1. 528 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 529 T = cast<ArrayType>(T)->getElementType(); 530 531 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 532 } 533 } 534 535 return Align / Target.getCharWidth(); 536} 537 538/// getTypeSize - Return the size of the specified type, in bits. This method 539/// does not work on incomplete types. 540/// 541/// FIXME: Pointers into different addr spaces could have different sizes and 542/// alignment requirements: getPointerInfo should take an AddrSpace, this 543/// should take a QualType, &c. 544std::pair<uint64_t, unsigned> 545ASTContext::getTypeInfo(const Type *T) { 546 uint64_t Width=0; 547 unsigned Align=8; 548 switch (T->getTypeClass()) { 549#define TYPE(Class, Base) 550#define ABSTRACT_TYPE(Class, Base) 551#define NON_CANONICAL_TYPE(Class, Base) 552#define DEPENDENT_TYPE(Class, Base) case Type::Class: 553#include "clang/AST/TypeNodes.def" 554 assert(false && "Should not see dependent types"); 555 break; 556 557 case Type::ObjCProtocolList: 558 assert(false && "Should not see protocol list types"); 559 break; 560 561 case Type::FunctionNoProto: 562 case Type::FunctionProto: 563 // GCC extension: alignof(function) = 32 bits 564 Width = 0; 565 Align = 32; 566 break; 567 568 case Type::IncompleteArray: 569 case Type::VariableArray: 570 Width = 0; 571 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 572 break; 573 574 case Type::ConstantArray: { 575 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 576 577 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 578 Width = EltInfo.first*CAT->getSize().getZExtValue(); 579 Align = EltInfo.second; 580 break; 581 } 582 case Type::ExtVector: 583 case Type::Vector: { 584 std::pair<uint64_t, unsigned> EltInfo = 585 getTypeInfo(cast<VectorType>(T)->getElementType()); 586 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 587 Align = Width; 588 // If the alignment is not a power of 2, round up to the next power of 2. 589 // This happens for non-power-of-2 length vectors. 590 // FIXME: this should probably be a target property. 591 Align = 1 << llvm::Log2_32_Ceil(Align); 592 break; 593 } 594 595 case Type::Builtin: 596 switch (cast<BuiltinType>(T)->getKind()) { 597 default: assert(0 && "Unknown builtin type!"); 598 case BuiltinType::Void: 599 // GCC extension: alignof(void) = 8 bits. 600 Width = 0; 601 Align = 8; 602 break; 603 604 case BuiltinType::Bool: 605 Width = Target.getBoolWidth(); 606 Align = Target.getBoolAlign(); 607 break; 608 case BuiltinType::Char_S: 609 case BuiltinType::Char_U: 610 case BuiltinType::UChar: 611 case BuiltinType::SChar: 612 Width = Target.getCharWidth(); 613 Align = Target.getCharAlign(); 614 break; 615 case BuiltinType::WChar: 616 Width = Target.getWCharWidth(); 617 Align = Target.getWCharAlign(); 618 break; 619 case BuiltinType::Char16: 620 Width = Target.getChar16Width(); 621 Align = Target.getChar16Align(); 622 break; 623 case BuiltinType::Char32: 624 Width = Target.getChar32Width(); 625 Align = Target.getChar32Align(); 626 break; 627 case BuiltinType::UShort: 628 case BuiltinType::Short: 629 Width = Target.getShortWidth(); 630 Align = Target.getShortAlign(); 631 break; 632 case BuiltinType::UInt: 633 case BuiltinType::Int: 634 Width = Target.getIntWidth(); 635 Align = Target.getIntAlign(); 636 break; 637 case BuiltinType::ULong: 638 case BuiltinType::Long: 639 Width = Target.getLongWidth(); 640 Align = Target.getLongAlign(); 641 break; 642 case BuiltinType::ULongLong: 643 case BuiltinType::LongLong: 644 Width = Target.getLongLongWidth(); 645 Align = Target.getLongLongAlign(); 646 break; 647 case BuiltinType::Int128: 648 case BuiltinType::UInt128: 649 Width = 128; 650 Align = 128; // int128_t is 128-bit aligned on all targets. 651 break; 652 case BuiltinType::Float: 653 Width = Target.getFloatWidth(); 654 Align = Target.getFloatAlign(); 655 break; 656 case BuiltinType::Double: 657 Width = Target.getDoubleWidth(); 658 Align = Target.getDoubleAlign(); 659 break; 660 case BuiltinType::LongDouble: 661 Width = Target.getLongDoubleWidth(); 662 Align = Target.getLongDoubleAlign(); 663 break; 664 case BuiltinType::NullPtr: 665 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 666 Align = Target.getPointerAlign(0); // == sizeof(void*) 667 break; 668 } 669 break; 670 case Type::FixedWidthInt: 671 // FIXME: This isn't precisely correct; the width/alignment should depend 672 // on the available types for the target 673 Width = cast<FixedWidthIntType>(T)->getWidth(); 674 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 675 Align = Width; 676 break; 677 case Type::ObjCObjectPointer: 678 Width = Target.getPointerWidth(0); 679 Align = Target.getPointerAlign(0); 680 break; 681 case Type::BlockPointer: { 682 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 683 Width = Target.getPointerWidth(AS); 684 Align = Target.getPointerAlign(AS); 685 break; 686 } 687 case Type::Pointer: { 688 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 689 Width = Target.getPointerWidth(AS); 690 Align = Target.getPointerAlign(AS); 691 break; 692 } 693 case Type::LValueReference: 694 case Type::RValueReference: 695 // "When applied to a reference or a reference type, the result is the size 696 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 697 // FIXME: This is wrong for struct layout: a reference in a struct has 698 // pointer size. 699 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 700 case Type::MemberPointer: { 701 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 702 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 703 // If we ever want to support other ABIs this needs to be abstracted. 704 705 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 706 std::pair<uint64_t, unsigned> PtrDiffInfo = 707 getTypeInfo(getPointerDiffType()); 708 Width = PtrDiffInfo.first; 709 if (Pointee->isFunctionType()) 710 Width *= 2; 711 Align = PtrDiffInfo.second; 712 break; 713 } 714 case Type::Complex: { 715 // Complex types have the same alignment as their elements, but twice the 716 // size. 717 std::pair<uint64_t, unsigned> EltInfo = 718 getTypeInfo(cast<ComplexType>(T)->getElementType()); 719 Width = EltInfo.first*2; 720 Align = EltInfo.second; 721 break; 722 } 723 case Type::ObjCInterface: { 724 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 725 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 726 Width = Layout.getSize(); 727 Align = Layout.getAlignment(); 728 break; 729 } 730 case Type::Record: 731 case Type::Enum: { 732 const TagType *TT = cast<TagType>(T); 733 734 if (TT->getDecl()->isInvalidDecl()) { 735 Width = 1; 736 Align = 1; 737 break; 738 } 739 740 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 741 return getTypeInfo(ET->getDecl()->getIntegerType()); 742 743 const RecordType *RT = cast<RecordType>(TT); 744 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 745 Width = Layout.getSize(); 746 Align = Layout.getAlignment(); 747 break; 748 } 749 750 case Type::Elaborated: { 751 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType().getTypePtr()); 752 } 753 754 case Type::Typedef: { 755 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 756 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 757 Align = Aligned->getAlignment(); 758 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 759 } else 760 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 761 break; 762 } 763 764 case Type::TypeOfExpr: 765 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 766 .getTypePtr()); 767 768 case Type::TypeOf: 769 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 770 771 case Type::Decltype: 772 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 773 .getTypePtr()); 774 775 case Type::QualifiedName: 776 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 777 778 case Type::TemplateSpecialization: 779 assert(getCanonicalType(T) != T && 780 "Cannot request the size of a dependent type"); 781 // FIXME: this is likely to be wrong once we support template 782 // aliases, since a template alias could refer to a typedef that 783 // has an __aligned__ attribute on it. 784 return getTypeInfo(getCanonicalType(T)); 785 } 786 787 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 788 return std::make_pair(Width, Align); 789} 790 791/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 792/// type for the current target in bits. This can be different than the ABI 793/// alignment in cases where it is beneficial for performance to overalign 794/// a data type. 795unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 796 unsigned ABIAlign = getTypeAlign(T); 797 798 // Double and long long should be naturally aligned if possible. 799 if (const ComplexType* CT = T->getAs<ComplexType>()) 800 T = CT->getElementType().getTypePtr(); 801 if (T->isSpecificBuiltinType(BuiltinType::Double) || 802 T->isSpecificBuiltinType(BuiltinType::LongLong)) 803 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 804 805 return ABIAlign; 806} 807 808static void CollectLocalObjCIvars(ASTContext *Ctx, 809 const ObjCInterfaceDecl *OI, 810 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 811 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 812 E = OI->ivar_end(); I != E; ++I) { 813 ObjCIvarDecl *IVDecl = *I; 814 if (!IVDecl->isInvalidDecl()) 815 Fields.push_back(cast<FieldDecl>(IVDecl)); 816 } 817} 818 819void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 820 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 821 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 822 CollectObjCIvars(SuperClass, Fields); 823 CollectLocalObjCIvars(this, OI, Fields); 824} 825 826/// ShallowCollectObjCIvars - 827/// Collect all ivars, including those synthesized, in the current class. 828/// 829void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 830 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 831 bool CollectSynthesized) { 832 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 833 E = OI->ivar_end(); I != E; ++I) { 834 Ivars.push_back(*I); 835 } 836 if (CollectSynthesized) 837 CollectSynthesizedIvars(OI, Ivars); 838} 839 840void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 841 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 842 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 843 E = PD->prop_end(); I != E; ++I) 844 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 845 Ivars.push_back(Ivar); 846 847 // Also look into nested protocols. 848 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 849 E = PD->protocol_end(); P != E; ++P) 850 CollectProtocolSynthesizedIvars(*P, Ivars); 851} 852 853/// CollectSynthesizedIvars - 854/// This routine collect synthesized ivars for the designated class. 855/// 856void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 857 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 858 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 859 E = OI->prop_end(); I != E; ++I) { 860 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 861 Ivars.push_back(Ivar); 862 } 863 // Also look into interface's protocol list for properties declared 864 // in the protocol and whose ivars are synthesized. 865 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 866 PE = OI->protocol_end(); P != PE; ++P) { 867 ObjCProtocolDecl *PD = (*P); 868 CollectProtocolSynthesizedIvars(PD, Ivars); 869 } 870} 871 872unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 873 unsigned count = 0; 874 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 875 E = PD->prop_end(); I != E; ++I) 876 if ((*I)->getPropertyIvarDecl()) 877 ++count; 878 879 // Also look into nested protocols. 880 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 881 E = PD->protocol_end(); P != E; ++P) 882 count += CountProtocolSynthesizedIvars(*P); 883 return count; 884} 885 886unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) { 887 unsigned count = 0; 888 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 889 E = OI->prop_end(); I != E; ++I) { 890 if ((*I)->getPropertyIvarDecl()) 891 ++count; 892 } 893 // Also look into interface's protocol list for properties declared 894 // in the protocol and whose ivars are synthesized. 895 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 896 PE = OI->protocol_end(); P != PE; ++P) { 897 ObjCProtocolDecl *PD = (*P); 898 count += CountProtocolSynthesizedIvars(PD); 899 } 900 return count; 901} 902 903/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 904ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 905 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 906 I = ObjCImpls.find(D); 907 if (I != ObjCImpls.end()) 908 return cast<ObjCImplementationDecl>(I->second); 909 return 0; 910} 911/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 912ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 913 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 914 I = ObjCImpls.find(D); 915 if (I != ObjCImpls.end()) 916 return cast<ObjCCategoryImplDecl>(I->second); 917 return 0; 918} 919 920/// \brief Set the implementation of ObjCInterfaceDecl. 921void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 922 ObjCImplementationDecl *ImplD) { 923 assert(IFaceD && ImplD && "Passed null params"); 924 ObjCImpls[IFaceD] = ImplD; 925} 926/// \brief Set the implementation of ObjCCategoryDecl. 927void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 928 ObjCCategoryImplDecl *ImplD) { 929 assert(CatD && ImplD && "Passed null params"); 930 ObjCImpls[CatD] = ImplD; 931} 932 933/// \brief Allocate an uninitialized DeclaratorInfo. 934/// 935/// The caller should initialize the memory held by DeclaratorInfo using 936/// the TypeLoc wrappers. 937/// 938/// \param T the type that will be the basis for type source info. This type 939/// should refer to how the declarator was written in source code, not to 940/// what type semantic analysis resolved the declarator to. 941DeclaratorInfo *ASTContext::CreateDeclaratorInfo(QualType T) { 942 unsigned DataSize = TypeLoc::getFullDataSizeForType(T); 943 DeclaratorInfo *DInfo = 944 (DeclaratorInfo*)BumpAlloc.Allocate(sizeof(DeclaratorInfo) + DataSize, 8); 945 new (DInfo) DeclaratorInfo(T); 946 return DInfo; 947} 948 949/// getInterfaceLayoutImpl - Get or compute information about the 950/// layout of the given interface. 951/// 952/// \param Impl - If given, also include the layout of the interface's 953/// implementation. This may differ by including synthesized ivars. 954const ASTRecordLayout & 955ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 956 const ObjCImplementationDecl *Impl) { 957 assert(!D->isForwardDecl() && "Invalid interface decl!"); 958 959 // Look up this layout, if already laid out, return what we have. 960 ObjCContainerDecl *Key = 961 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 962 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 963 return *Entry; 964 965 // Add in synthesized ivar count if laying out an implementation. 966 if (Impl) { 967 unsigned FieldCount = D->ivar_size(); 968 unsigned SynthCount = CountSynthesizedIvars(D); 969 FieldCount += SynthCount; 970 // If there aren't any sythesized ivars then reuse the interface 971 // entry. Note we can't cache this because we simply free all 972 // entries later; however we shouldn't look up implementations 973 // frequently. 974 if (SynthCount == 0) 975 return getObjCLayout(D, 0); 976 } 977 978 const ASTRecordLayout *NewEntry = 979 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 980 ObjCLayouts[Key] = NewEntry; 981 982 return *NewEntry; 983} 984 985const ASTRecordLayout & 986ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 987 return getObjCLayout(D, 0); 988} 989 990const ASTRecordLayout & 991ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 992 return getObjCLayout(D->getClassInterface(), D); 993} 994 995/// getASTRecordLayout - Get or compute information about the layout of the 996/// specified record (struct/union/class), which indicates its size and field 997/// position information. 998const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 999 D = D->getDefinition(*this); 1000 assert(D && "Cannot get layout of forward declarations!"); 1001 1002 // Look up this layout, if already laid out, return what we have. 1003 // Note that we can't save a reference to the entry because this function 1004 // is recursive. 1005 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 1006 if (Entry) return *Entry; 1007 1008 const ASTRecordLayout *NewEntry = 1009 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 1010 ASTRecordLayouts[D] = NewEntry; 1011 1012 return *NewEntry; 1013} 1014 1015//===----------------------------------------------------------------------===// 1016// Type creation/memoization methods 1017//===----------------------------------------------------------------------===// 1018 1019QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1020 unsigned Fast = Quals.getFastQualifiers(); 1021 Quals.removeFastQualifiers(); 1022 1023 // Check if we've already instantiated this type. 1024 llvm::FoldingSetNodeID ID; 1025 ExtQuals::Profile(ID, TypeNode, Quals); 1026 void *InsertPos = 0; 1027 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1028 assert(EQ->getQualifiers() == Quals); 1029 QualType T = QualType(EQ, Fast); 1030 return T; 1031 } 1032 1033 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1034 ExtQualNodes.InsertNode(New, InsertPos); 1035 QualType T = QualType(New, Fast); 1036 return T; 1037} 1038 1039QualType ASTContext::getVolatileType(QualType T) { 1040 QualType CanT = getCanonicalType(T); 1041 if (CanT.isVolatileQualified()) return T; 1042 1043 QualifierCollector Quals; 1044 const Type *TypeNode = Quals.strip(T); 1045 Quals.addVolatile(); 1046 1047 return getExtQualType(TypeNode, Quals); 1048} 1049 1050QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1051 QualType CanT = getCanonicalType(T); 1052 if (CanT.getAddressSpace() == AddressSpace) 1053 return T; 1054 1055 // If we are composing extended qualifiers together, merge together 1056 // into one ExtQuals node. 1057 QualifierCollector Quals; 1058 const Type *TypeNode = Quals.strip(T); 1059 1060 // If this type already has an address space specified, it cannot get 1061 // another one. 1062 assert(!Quals.hasAddressSpace() && 1063 "Type cannot be in multiple addr spaces!"); 1064 Quals.addAddressSpace(AddressSpace); 1065 1066 return getExtQualType(TypeNode, Quals); 1067} 1068 1069QualType ASTContext::getObjCGCQualType(QualType T, 1070 Qualifiers::GC GCAttr) { 1071 QualType CanT = getCanonicalType(T); 1072 if (CanT.getObjCGCAttr() == GCAttr) 1073 return T; 1074 1075 if (T->isPointerType()) { 1076 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1077 if (Pointee->isAnyPointerType()) { 1078 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1079 return getPointerType(ResultType); 1080 } 1081 } 1082 1083 // If we are composing extended qualifiers together, merge together 1084 // into one ExtQuals node. 1085 QualifierCollector Quals; 1086 const Type *TypeNode = Quals.strip(T); 1087 1088 // If this type already has an ObjCGC specified, it cannot get 1089 // another one. 1090 assert(!Quals.hasObjCGCAttr() && 1091 "Type cannot have multiple ObjCGCs!"); 1092 Quals.addObjCGCAttr(GCAttr); 1093 1094 return getExtQualType(TypeNode, Quals); 1095} 1096 1097QualType ASTContext::getNoReturnType(QualType T) { 1098 QualType ResultType; 1099 if (T->isPointerType()) { 1100 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1101 ResultType = getNoReturnType(Pointee); 1102 ResultType = getPointerType(ResultType); 1103 } else if (T->isBlockPointerType()) { 1104 QualType Pointee = T->getAs<BlockPointerType>()->getPointeeType(); 1105 ResultType = getNoReturnType(Pointee); 1106 ResultType = getBlockPointerType(ResultType); 1107 } else { 1108 assert (T->isFunctionType() 1109 && "can't noreturn qualify non-pointer to function or block type"); 1110 1111 if (const FunctionNoProtoType *FNPT = T->getAs<FunctionNoProtoType>()) { 1112 ResultType = getFunctionNoProtoType(FNPT->getResultType(), true); 1113 } else { 1114 const FunctionProtoType *F = T->getAs<FunctionProtoType>(); 1115 ResultType 1116 = getFunctionType(F->getResultType(), F->arg_type_begin(), 1117 F->getNumArgs(), F->isVariadic(), F->getTypeQuals(), 1118 F->hasExceptionSpec(), F->hasAnyExceptionSpec(), 1119 F->getNumExceptions(), F->exception_begin(), true); 1120 } 1121 } 1122 1123 return getQualifiedType(ResultType, T.getQualifiers()); 1124} 1125 1126/// getComplexType - Return the uniqued reference to the type for a complex 1127/// number with the specified element type. 1128QualType ASTContext::getComplexType(QualType T) { 1129 // Unique pointers, to guarantee there is only one pointer of a particular 1130 // structure. 1131 llvm::FoldingSetNodeID ID; 1132 ComplexType::Profile(ID, T); 1133 1134 void *InsertPos = 0; 1135 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1136 return QualType(CT, 0); 1137 1138 // If the pointee type isn't canonical, this won't be a canonical type either, 1139 // so fill in the canonical type field. 1140 QualType Canonical; 1141 if (!T->isCanonical()) { 1142 Canonical = getComplexType(getCanonicalType(T)); 1143 1144 // Get the new insert position for the node we care about. 1145 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1146 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1147 } 1148 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1149 Types.push_back(New); 1150 ComplexTypes.InsertNode(New, InsertPos); 1151 return QualType(New, 0); 1152} 1153 1154QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1155 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1156 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1157 FixedWidthIntType *&Entry = Map[Width]; 1158 if (!Entry) 1159 Entry = new FixedWidthIntType(Width, Signed); 1160 return QualType(Entry, 0); 1161} 1162 1163/// getPointerType - Return the uniqued reference to the type for a pointer to 1164/// the specified type. 1165QualType ASTContext::getPointerType(QualType T) { 1166 // Unique pointers, to guarantee there is only one pointer of a particular 1167 // structure. 1168 llvm::FoldingSetNodeID ID; 1169 PointerType::Profile(ID, T); 1170 1171 void *InsertPos = 0; 1172 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1173 return QualType(PT, 0); 1174 1175 // If the pointee type isn't canonical, this won't be a canonical type either, 1176 // so fill in the canonical type field. 1177 QualType Canonical; 1178 if (!T->isCanonical()) { 1179 Canonical = getPointerType(getCanonicalType(T)); 1180 1181 // Get the new insert position for the node we care about. 1182 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1183 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1184 } 1185 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1186 Types.push_back(New); 1187 PointerTypes.InsertNode(New, InsertPos); 1188 return QualType(New, 0); 1189} 1190 1191/// getBlockPointerType - Return the uniqued reference to the type for 1192/// a pointer to the specified block. 1193QualType ASTContext::getBlockPointerType(QualType T) { 1194 assert(T->isFunctionType() && "block of function types only"); 1195 // Unique pointers, to guarantee there is only one block of a particular 1196 // structure. 1197 llvm::FoldingSetNodeID ID; 1198 BlockPointerType::Profile(ID, T); 1199 1200 void *InsertPos = 0; 1201 if (BlockPointerType *PT = 1202 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1203 return QualType(PT, 0); 1204 1205 // If the block pointee type isn't canonical, this won't be a canonical 1206 // type either so fill in the canonical type field. 1207 QualType Canonical; 1208 if (!T->isCanonical()) { 1209 Canonical = getBlockPointerType(getCanonicalType(T)); 1210 1211 // Get the new insert position for the node we care about. 1212 BlockPointerType *NewIP = 1213 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1214 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1215 } 1216 BlockPointerType *New 1217 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1218 Types.push_back(New); 1219 BlockPointerTypes.InsertNode(New, InsertPos); 1220 return QualType(New, 0); 1221} 1222 1223/// getLValueReferenceType - Return the uniqued reference to the type for an 1224/// lvalue reference to the specified type. 1225QualType ASTContext::getLValueReferenceType(QualType T) { 1226 // Unique pointers, to guarantee there is only one pointer of a particular 1227 // structure. 1228 llvm::FoldingSetNodeID ID; 1229 ReferenceType::Profile(ID, T); 1230 1231 void *InsertPos = 0; 1232 if (LValueReferenceType *RT = 1233 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1234 return QualType(RT, 0); 1235 1236 // If the referencee type isn't canonical, this won't be a canonical type 1237 // either, so fill in the canonical type field. 1238 QualType Canonical; 1239 if (!T->isCanonical()) { 1240 Canonical = getLValueReferenceType(getCanonicalType(T)); 1241 1242 // Get the new insert position for the node we care about. 1243 LValueReferenceType *NewIP = 1244 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1245 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1246 } 1247 1248 LValueReferenceType *New 1249 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical); 1250 Types.push_back(New); 1251 LValueReferenceTypes.InsertNode(New, InsertPos); 1252 return QualType(New, 0); 1253} 1254 1255/// getRValueReferenceType - Return the uniqued reference to the type for an 1256/// rvalue reference to the specified type. 1257QualType ASTContext::getRValueReferenceType(QualType T) { 1258 // Unique pointers, to guarantee there is only one pointer of a particular 1259 // structure. 1260 llvm::FoldingSetNodeID ID; 1261 ReferenceType::Profile(ID, T); 1262 1263 void *InsertPos = 0; 1264 if (RValueReferenceType *RT = 1265 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1266 return QualType(RT, 0); 1267 1268 // If the referencee type isn't canonical, this won't be a canonical type 1269 // either, so fill in the canonical type field. 1270 QualType Canonical; 1271 if (!T->isCanonical()) { 1272 Canonical = getRValueReferenceType(getCanonicalType(T)); 1273 1274 // Get the new insert position for the node we care about. 1275 RValueReferenceType *NewIP = 1276 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1277 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1278 } 1279 1280 RValueReferenceType *New 1281 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1282 Types.push_back(New); 1283 RValueReferenceTypes.InsertNode(New, InsertPos); 1284 return QualType(New, 0); 1285} 1286 1287/// getMemberPointerType - Return the uniqued reference to the type for a 1288/// member pointer to the specified type, in the specified class. 1289QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1290 // Unique pointers, to guarantee there is only one pointer of a particular 1291 // structure. 1292 llvm::FoldingSetNodeID ID; 1293 MemberPointerType::Profile(ID, T, Cls); 1294 1295 void *InsertPos = 0; 1296 if (MemberPointerType *PT = 1297 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1298 return QualType(PT, 0); 1299 1300 // If the pointee or class type isn't canonical, this won't be a canonical 1301 // type either, so fill in the canonical type field. 1302 QualType Canonical; 1303 if (!T->isCanonical()) { 1304 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1305 1306 // Get the new insert position for the node we care about. 1307 MemberPointerType *NewIP = 1308 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1309 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1310 } 1311 MemberPointerType *New 1312 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1313 Types.push_back(New); 1314 MemberPointerTypes.InsertNode(New, InsertPos); 1315 return QualType(New, 0); 1316} 1317 1318/// getConstantArrayType - Return the unique reference to the type for an 1319/// array of the specified element type. 1320QualType ASTContext::getConstantArrayType(QualType EltTy, 1321 const llvm::APInt &ArySizeIn, 1322 ArrayType::ArraySizeModifier ASM, 1323 unsigned EltTypeQuals) { 1324 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1325 "Constant array of VLAs is illegal!"); 1326 1327 // Convert the array size into a canonical width matching the pointer size for 1328 // the target. 1329 llvm::APInt ArySize(ArySizeIn); 1330 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1331 1332 llvm::FoldingSetNodeID ID; 1333 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1334 1335 void *InsertPos = 0; 1336 if (ConstantArrayType *ATP = 1337 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1338 return QualType(ATP, 0); 1339 1340 // If the element type isn't canonical, this won't be a canonical type either, 1341 // so fill in the canonical type field. 1342 QualType Canonical; 1343 if (!EltTy->isCanonical()) { 1344 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1345 ASM, EltTypeQuals); 1346 // Get the new insert position for the node we care about. 1347 ConstantArrayType *NewIP = 1348 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1349 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1350 } 1351 1352 ConstantArrayType *New = new(*this,TypeAlignment) 1353 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1354 ConstantArrayTypes.InsertNode(New, InsertPos); 1355 Types.push_back(New); 1356 return QualType(New, 0); 1357} 1358 1359/// getVariableArrayType - Returns a non-unique reference to the type for a 1360/// variable array of the specified element type. 1361QualType ASTContext::getVariableArrayType(QualType EltTy, 1362 Expr *NumElts, 1363 ArrayType::ArraySizeModifier ASM, 1364 unsigned EltTypeQuals, 1365 SourceRange Brackets) { 1366 // Since we don't unique expressions, it isn't possible to unique VLA's 1367 // that have an expression provided for their size. 1368 1369 VariableArrayType *New = new(*this, TypeAlignment) 1370 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1371 1372 VariableArrayTypes.push_back(New); 1373 Types.push_back(New); 1374 return QualType(New, 0); 1375} 1376 1377/// getDependentSizedArrayType - Returns a non-unique reference to 1378/// the type for a dependently-sized array of the specified element 1379/// type. 1380QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1381 Expr *NumElts, 1382 ArrayType::ArraySizeModifier ASM, 1383 unsigned EltTypeQuals, 1384 SourceRange Brackets) { 1385 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1386 "Size must be type- or value-dependent!"); 1387 1388 llvm::FoldingSetNodeID ID; 1389 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1390 EltTypeQuals, NumElts); 1391 1392 void *InsertPos = 0; 1393 DependentSizedArrayType *Canon 1394 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1395 DependentSizedArrayType *New; 1396 if (Canon) { 1397 // We already have a canonical version of this array type; use it as 1398 // the canonical type for a newly-built type. 1399 New = new (*this, TypeAlignment) 1400 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1401 NumElts, ASM, EltTypeQuals, Brackets); 1402 } else { 1403 QualType CanonEltTy = getCanonicalType(EltTy); 1404 if (CanonEltTy == EltTy) { 1405 New = new (*this, TypeAlignment) 1406 DependentSizedArrayType(*this, EltTy, QualType(), 1407 NumElts, ASM, EltTypeQuals, Brackets); 1408 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1409 } else { 1410 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1411 ASM, EltTypeQuals, 1412 SourceRange()); 1413 New = new (*this, TypeAlignment) 1414 DependentSizedArrayType(*this, EltTy, Canon, 1415 NumElts, ASM, EltTypeQuals, Brackets); 1416 } 1417 } 1418 1419 Types.push_back(New); 1420 return QualType(New, 0); 1421} 1422 1423QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1424 ArrayType::ArraySizeModifier ASM, 1425 unsigned EltTypeQuals) { 1426 llvm::FoldingSetNodeID ID; 1427 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1428 1429 void *InsertPos = 0; 1430 if (IncompleteArrayType *ATP = 1431 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1432 return QualType(ATP, 0); 1433 1434 // If the element type isn't canonical, this won't be a canonical type 1435 // either, so fill in the canonical type field. 1436 QualType Canonical; 1437 1438 if (!EltTy->isCanonical()) { 1439 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1440 ASM, EltTypeQuals); 1441 1442 // Get the new insert position for the node we care about. 1443 IncompleteArrayType *NewIP = 1444 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1445 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1446 } 1447 1448 IncompleteArrayType *New = new (*this, TypeAlignment) 1449 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1450 1451 IncompleteArrayTypes.InsertNode(New, InsertPos); 1452 Types.push_back(New); 1453 return QualType(New, 0); 1454} 1455 1456/// getVectorType - Return the unique reference to a vector type of 1457/// the specified element type and size. VectorType must be a built-in type. 1458QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1459 BuiltinType *baseType; 1460 1461 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1462 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1463 1464 // Check if we've already instantiated a vector of this type. 1465 llvm::FoldingSetNodeID ID; 1466 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1467 void *InsertPos = 0; 1468 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1469 return QualType(VTP, 0); 1470 1471 // If the element type isn't canonical, this won't be a canonical type either, 1472 // so fill in the canonical type field. 1473 QualType Canonical; 1474 if (!vecType->isCanonical()) { 1475 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1476 1477 // Get the new insert position for the node we care about. 1478 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1479 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1480 } 1481 VectorType *New = new (*this, TypeAlignment) 1482 VectorType(vecType, NumElts, Canonical); 1483 VectorTypes.InsertNode(New, InsertPos); 1484 Types.push_back(New); 1485 return QualType(New, 0); 1486} 1487 1488/// getExtVectorType - Return the unique reference to an extended vector type of 1489/// the specified element type and size. VectorType must be a built-in type. 1490QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1491 BuiltinType *baseType; 1492 1493 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1494 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1495 1496 // Check if we've already instantiated a vector of this type. 1497 llvm::FoldingSetNodeID ID; 1498 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1499 void *InsertPos = 0; 1500 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1501 return QualType(VTP, 0); 1502 1503 // If the element type isn't canonical, this won't be a canonical type either, 1504 // so fill in the canonical type field. 1505 QualType Canonical; 1506 if (!vecType->isCanonical()) { 1507 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1508 1509 // Get the new insert position for the node we care about. 1510 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1511 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1512 } 1513 ExtVectorType *New = new (*this, TypeAlignment) 1514 ExtVectorType(vecType, NumElts, Canonical); 1515 VectorTypes.InsertNode(New, InsertPos); 1516 Types.push_back(New); 1517 return QualType(New, 0); 1518} 1519 1520QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1521 Expr *SizeExpr, 1522 SourceLocation AttrLoc) { 1523 llvm::FoldingSetNodeID ID; 1524 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1525 SizeExpr); 1526 1527 void *InsertPos = 0; 1528 DependentSizedExtVectorType *Canon 1529 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1530 DependentSizedExtVectorType *New; 1531 if (Canon) { 1532 // We already have a canonical version of this array type; use it as 1533 // the canonical type for a newly-built type. 1534 New = new (*this, TypeAlignment) 1535 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1536 SizeExpr, AttrLoc); 1537 } else { 1538 QualType CanonVecTy = getCanonicalType(vecType); 1539 if (CanonVecTy == vecType) { 1540 New = new (*this, TypeAlignment) 1541 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1542 AttrLoc); 1543 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1544 } else { 1545 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1546 SourceLocation()); 1547 New = new (*this, TypeAlignment) 1548 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1549 } 1550 } 1551 1552 Types.push_back(New); 1553 return QualType(New, 0); 1554} 1555 1556/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1557/// 1558QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1559 // Unique functions, to guarantee there is only one function of a particular 1560 // structure. 1561 llvm::FoldingSetNodeID ID; 1562 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1563 1564 void *InsertPos = 0; 1565 if (FunctionNoProtoType *FT = 1566 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1567 return QualType(FT, 0); 1568 1569 QualType Canonical; 1570 if (!ResultTy->isCanonical()) { 1571 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1572 1573 // Get the new insert position for the node we care about. 1574 FunctionNoProtoType *NewIP = 1575 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1576 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1577 } 1578 1579 FunctionNoProtoType *New = new (*this, TypeAlignment) 1580 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1581 Types.push_back(New); 1582 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1583 return QualType(New, 0); 1584} 1585 1586/// getFunctionType - Return a normal function type with a typed argument 1587/// list. isVariadic indicates whether the argument list includes '...'. 1588QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1589 unsigned NumArgs, bool isVariadic, 1590 unsigned TypeQuals, bool hasExceptionSpec, 1591 bool hasAnyExceptionSpec, unsigned NumExs, 1592 const QualType *ExArray, bool NoReturn) { 1593 if (LangOpts.CPlusPlus) { 1594 for (unsigned i = 0; i != NumArgs; ++i) 1595 assert(!ArgArray[i].hasQualifiers() && 1596 "C++ arguments can't have toplevel qualifiers!"); 1597 } 1598 1599 // Unique functions, to guarantee there is only one function of a particular 1600 // structure. 1601 llvm::FoldingSetNodeID ID; 1602 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1603 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1604 NumExs, ExArray, NoReturn); 1605 1606 void *InsertPos = 0; 1607 if (FunctionProtoType *FTP = 1608 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1609 return QualType(FTP, 0); 1610 1611 // Determine whether the type being created is already canonical or not. 1612 bool isCanonical = ResultTy->isCanonical(); 1613 if (hasExceptionSpec) 1614 isCanonical = false; 1615 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1616 if (!ArgArray[i]->isCanonical()) 1617 isCanonical = false; 1618 1619 // If this type isn't canonical, get the canonical version of it. 1620 // The exception spec is not part of the canonical type. 1621 QualType Canonical; 1622 if (!isCanonical) { 1623 llvm::SmallVector<QualType, 16> CanonicalArgs; 1624 CanonicalArgs.reserve(NumArgs); 1625 for (unsigned i = 0; i != NumArgs; ++i) 1626 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1627 1628 Canonical = getFunctionType(getCanonicalType(ResultTy), 1629 CanonicalArgs.data(), NumArgs, 1630 isVariadic, TypeQuals, false, 1631 false, 0, 0, NoReturn); 1632 1633 // Get the new insert position for the node we care about. 1634 FunctionProtoType *NewIP = 1635 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1636 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1637 } 1638 1639 // FunctionProtoType objects are allocated with extra bytes after them 1640 // for two variable size arrays (for parameter and exception types) at the 1641 // end of them. 1642 FunctionProtoType *FTP = 1643 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1644 NumArgs*sizeof(QualType) + 1645 NumExs*sizeof(QualType), TypeAlignment); 1646 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1647 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1648 ExArray, NumExs, Canonical, NoReturn); 1649 Types.push_back(FTP); 1650 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1651 return QualType(FTP, 0); 1652} 1653 1654/// getTypeDeclType - Return the unique reference to the type for the 1655/// specified type declaration. 1656QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1657 assert(Decl && "Passed null for Decl param"); 1658 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1659 1660 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1661 return getTypedefType(Typedef); 1662 else if (isa<TemplateTypeParmDecl>(Decl)) { 1663 assert(false && "Template type parameter types are always available."); 1664 } else if (ObjCInterfaceDecl *ObjCInterface 1665 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1666 return getObjCInterfaceType(ObjCInterface); 1667 1668 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1669 if (PrevDecl) 1670 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1671 else 1672 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1673 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1674 if (PrevDecl) 1675 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1676 else 1677 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1678 } else 1679 assert(false && "TypeDecl without a type?"); 1680 1681 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1682 return QualType(Decl->TypeForDecl, 0); 1683} 1684 1685/// getTypedefType - Return the unique reference to the type for the 1686/// specified typename decl. 1687QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1688 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1689 1690 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1691 Decl->TypeForDecl = new(*this, TypeAlignment) 1692 TypedefType(Type::Typedef, Decl, Canonical); 1693 Types.push_back(Decl->TypeForDecl); 1694 return QualType(Decl->TypeForDecl, 0); 1695} 1696 1697/// \brief Retrieve the template type parameter type for a template 1698/// parameter or parameter pack with the given depth, index, and (optionally) 1699/// name. 1700QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1701 bool ParameterPack, 1702 IdentifierInfo *Name) { 1703 llvm::FoldingSetNodeID ID; 1704 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1705 void *InsertPos = 0; 1706 TemplateTypeParmType *TypeParm 1707 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1708 1709 if (TypeParm) 1710 return QualType(TypeParm, 0); 1711 1712 if (Name) { 1713 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1714 TypeParm = new (*this, TypeAlignment) 1715 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1716 } else 1717 TypeParm = new (*this, TypeAlignment) 1718 TemplateTypeParmType(Depth, Index, ParameterPack); 1719 1720 Types.push_back(TypeParm); 1721 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1722 1723 return QualType(TypeParm, 0); 1724} 1725 1726QualType 1727ASTContext::getTemplateSpecializationType(TemplateName Template, 1728 const TemplateArgument *Args, 1729 unsigned NumArgs, 1730 QualType Canon) { 1731 if (!Canon.isNull()) 1732 Canon = getCanonicalType(Canon); 1733 else { 1734 // Build the canonical template specialization type. 1735 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1736 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1737 CanonArgs.reserve(NumArgs); 1738 for (unsigned I = 0; I != NumArgs; ++I) 1739 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1740 1741 // Determine whether this canonical template specialization type already 1742 // exists. 1743 llvm::FoldingSetNodeID ID; 1744 TemplateSpecializationType::Profile(ID, CanonTemplate, 1745 CanonArgs.data(), NumArgs, *this); 1746 1747 void *InsertPos = 0; 1748 TemplateSpecializationType *Spec 1749 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1750 1751 if (!Spec) { 1752 // Allocate a new canonical template specialization type. 1753 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1754 sizeof(TemplateArgument) * NumArgs), 1755 TypeAlignment); 1756 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1757 CanonArgs.data(), NumArgs, 1758 Canon); 1759 Types.push_back(Spec); 1760 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1761 } 1762 1763 if (Canon.isNull()) 1764 Canon = QualType(Spec, 0); 1765 assert(Canon->isDependentType() && 1766 "Non-dependent template-id type must have a canonical type"); 1767 } 1768 1769 // Allocate the (non-canonical) template specialization type, but don't 1770 // try to unique it: these types typically have location information that 1771 // we don't unique and don't want to lose. 1772 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1773 sizeof(TemplateArgument) * NumArgs), 1774 TypeAlignment); 1775 TemplateSpecializationType *Spec 1776 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1777 Canon); 1778 1779 Types.push_back(Spec); 1780 return QualType(Spec, 0); 1781} 1782 1783QualType 1784ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1785 QualType NamedType) { 1786 llvm::FoldingSetNodeID ID; 1787 QualifiedNameType::Profile(ID, NNS, NamedType); 1788 1789 void *InsertPos = 0; 1790 QualifiedNameType *T 1791 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1792 if (T) 1793 return QualType(T, 0); 1794 1795 T = new (*this) QualifiedNameType(NNS, NamedType, 1796 getCanonicalType(NamedType)); 1797 Types.push_back(T); 1798 QualifiedNameTypes.InsertNode(T, InsertPos); 1799 return QualType(T, 0); 1800} 1801 1802QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1803 const IdentifierInfo *Name, 1804 QualType Canon) { 1805 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1806 1807 if (Canon.isNull()) { 1808 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1809 if (CanonNNS != NNS) 1810 Canon = getTypenameType(CanonNNS, Name); 1811 } 1812 1813 llvm::FoldingSetNodeID ID; 1814 TypenameType::Profile(ID, NNS, Name); 1815 1816 void *InsertPos = 0; 1817 TypenameType *T 1818 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1819 if (T) 1820 return QualType(T, 0); 1821 1822 T = new (*this) TypenameType(NNS, Name, Canon); 1823 Types.push_back(T); 1824 TypenameTypes.InsertNode(T, InsertPos); 1825 return QualType(T, 0); 1826} 1827 1828QualType 1829ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1830 const TemplateSpecializationType *TemplateId, 1831 QualType Canon) { 1832 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1833 1834 if (Canon.isNull()) { 1835 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1836 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1837 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1838 const TemplateSpecializationType *CanonTemplateId 1839 = CanonType->getAs<TemplateSpecializationType>(); 1840 assert(CanonTemplateId && 1841 "Canonical type must also be a template specialization type"); 1842 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1843 } 1844 } 1845 1846 llvm::FoldingSetNodeID ID; 1847 TypenameType::Profile(ID, NNS, TemplateId); 1848 1849 void *InsertPos = 0; 1850 TypenameType *T 1851 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1852 if (T) 1853 return QualType(T, 0); 1854 1855 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1856 Types.push_back(T); 1857 TypenameTypes.InsertNode(T, InsertPos); 1858 return QualType(T, 0); 1859} 1860 1861QualType 1862ASTContext::getElaboratedType(QualType UnderlyingType, 1863 ElaboratedType::TagKind Tag) { 1864 llvm::FoldingSetNodeID ID; 1865 ElaboratedType::Profile(ID, UnderlyingType, Tag); 1866 1867 void *InsertPos = 0; 1868 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 1869 if (T) 1870 return QualType(T, 0); 1871 1872 QualType Canon = getCanonicalType(UnderlyingType); 1873 1874 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 1875 Types.push_back(T); 1876 ElaboratedTypes.InsertNode(T, InsertPos); 1877 return QualType(T, 0); 1878} 1879 1880/// CmpProtocolNames - Comparison predicate for sorting protocols 1881/// alphabetically. 1882static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1883 const ObjCProtocolDecl *RHS) { 1884 return LHS->getDeclName() < RHS->getDeclName(); 1885} 1886 1887static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1888 unsigned &NumProtocols) { 1889 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1890 1891 // Sort protocols, keyed by name. 1892 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1893 1894 // Remove duplicates. 1895 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1896 NumProtocols = ProtocolsEnd-Protocols; 1897} 1898 1899/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1900/// the given interface decl and the conforming protocol list. 1901QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1902 ObjCProtocolDecl **Protocols, 1903 unsigned NumProtocols) { 1904 // Sort the protocol list alphabetically to canonicalize it. 1905 if (NumProtocols) 1906 SortAndUniqueProtocols(Protocols, NumProtocols); 1907 1908 llvm::FoldingSetNodeID ID; 1909 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1910 1911 void *InsertPos = 0; 1912 if (ObjCObjectPointerType *QT = 1913 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1914 return QualType(QT, 0); 1915 1916 // No Match; 1917 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 1918 ObjCObjectPointerType(InterfaceT, Protocols, NumProtocols); 1919 1920 Types.push_back(QType); 1921 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1922 return QualType(QType, 0); 1923} 1924 1925/// getObjCInterfaceType - Return the unique reference to the type for the 1926/// specified ObjC interface decl. The list of protocols is optional. 1927QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1928 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1929 if (NumProtocols) 1930 // Sort the protocol list alphabetically to canonicalize it. 1931 SortAndUniqueProtocols(Protocols, NumProtocols); 1932 1933 llvm::FoldingSetNodeID ID; 1934 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1935 1936 void *InsertPos = 0; 1937 if (ObjCInterfaceType *QT = 1938 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1939 return QualType(QT, 0); 1940 1941 // No Match; 1942 ObjCInterfaceType *QType = new (*this, TypeAlignment) 1943 ObjCInterfaceType(const_cast<ObjCInterfaceDecl*>(Decl), 1944 Protocols, NumProtocols); 1945 Types.push_back(QType); 1946 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 1947 return QualType(QType, 0); 1948} 1949 1950QualType ASTContext::getObjCProtocolListType(QualType T, 1951 ObjCProtocolDecl **Protocols, 1952 unsigned NumProtocols) { 1953 llvm::FoldingSetNodeID ID; 1954 ObjCProtocolListType::Profile(ID, T, Protocols, NumProtocols); 1955 1956 void *InsertPos = 0; 1957 if (ObjCProtocolListType *QT = 1958 ObjCProtocolListTypes.FindNodeOrInsertPos(ID, InsertPos)) 1959 return QualType(QT, 0); 1960 1961 // No Match; 1962 ObjCProtocolListType *QType = new (*this, TypeAlignment) 1963 ObjCProtocolListType(T, Protocols, NumProtocols); 1964 Types.push_back(QType); 1965 ObjCProtocolListTypes.InsertNode(QType, InsertPos); 1966 return QualType(QType, 0); 1967} 1968 1969/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1970/// TypeOfExprType AST's (since expression's are never shared). For example, 1971/// multiple declarations that refer to "typeof(x)" all contain different 1972/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1973/// on canonical type's (which are always unique). 1974QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1975 TypeOfExprType *toe; 1976 if (tofExpr->isTypeDependent()) { 1977 llvm::FoldingSetNodeID ID; 1978 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 1979 1980 void *InsertPos = 0; 1981 DependentTypeOfExprType *Canon 1982 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 1983 if (Canon) { 1984 // We already have a "canonical" version of an identical, dependent 1985 // typeof(expr) type. Use that as our canonical type. 1986 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 1987 QualType((TypeOfExprType*)Canon, 0)); 1988 } 1989 else { 1990 // Build a new, canonical typeof(expr) type. 1991 Canon 1992 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 1993 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 1994 toe = Canon; 1995 } 1996 } else { 1997 QualType Canonical = getCanonicalType(tofExpr->getType()); 1998 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 1999 } 2000 Types.push_back(toe); 2001 return QualType(toe, 0); 2002} 2003 2004/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2005/// TypeOfType AST's. The only motivation to unique these nodes would be 2006/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2007/// an issue. This doesn't effect the type checker, since it operates 2008/// on canonical type's (which are always unique). 2009QualType ASTContext::getTypeOfType(QualType tofType) { 2010 QualType Canonical = getCanonicalType(tofType); 2011 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2012 Types.push_back(tot); 2013 return QualType(tot, 0); 2014} 2015 2016/// getDecltypeForExpr - Given an expr, will return the decltype for that 2017/// expression, according to the rules in C++0x [dcl.type.simple]p4 2018static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2019 if (e->isTypeDependent()) 2020 return Context.DependentTy; 2021 2022 // If e is an id expression or a class member access, decltype(e) is defined 2023 // as the type of the entity named by e. 2024 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2025 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2026 return VD->getType(); 2027 } 2028 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2029 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2030 return FD->getType(); 2031 } 2032 // If e is a function call or an invocation of an overloaded operator, 2033 // (parentheses around e are ignored), decltype(e) is defined as the 2034 // return type of that function. 2035 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2036 return CE->getCallReturnType(); 2037 2038 QualType T = e->getType(); 2039 2040 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2041 // defined as T&, otherwise decltype(e) is defined as T. 2042 if (e->isLvalue(Context) == Expr::LV_Valid) 2043 T = Context.getLValueReferenceType(T); 2044 2045 return T; 2046} 2047 2048/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2049/// DecltypeType AST's. The only motivation to unique these nodes would be 2050/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2051/// an issue. This doesn't effect the type checker, since it operates 2052/// on canonical type's (which are always unique). 2053QualType ASTContext::getDecltypeType(Expr *e) { 2054 DecltypeType *dt; 2055 if (e->isTypeDependent()) { 2056 llvm::FoldingSetNodeID ID; 2057 DependentDecltypeType::Profile(ID, *this, e); 2058 2059 void *InsertPos = 0; 2060 DependentDecltypeType *Canon 2061 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2062 if (Canon) { 2063 // We already have a "canonical" version of an equivalent, dependent 2064 // decltype type. Use that as our canonical type. 2065 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2066 QualType((DecltypeType*)Canon, 0)); 2067 } 2068 else { 2069 // Build a new, canonical typeof(expr) type. 2070 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2071 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2072 dt = Canon; 2073 } 2074 } else { 2075 QualType T = getDecltypeForExpr(e, *this); 2076 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2077 } 2078 Types.push_back(dt); 2079 return QualType(dt, 0); 2080} 2081 2082/// getTagDeclType - Return the unique reference to the type for the 2083/// specified TagDecl (struct/union/class/enum) decl. 2084QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2085 assert (Decl); 2086 // FIXME: What is the design on getTagDeclType when it requires casting 2087 // away const? mutable? 2088 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2089} 2090 2091/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2092/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2093/// needs to agree with the definition in <stddef.h>. 2094QualType ASTContext::getSizeType() const { 2095 return getFromTargetType(Target.getSizeType()); 2096} 2097 2098/// getSignedWCharType - Return the type of "signed wchar_t". 2099/// Used when in C++, as a GCC extension. 2100QualType ASTContext::getSignedWCharType() const { 2101 // FIXME: derive from "Target" ? 2102 return WCharTy; 2103} 2104 2105/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2106/// Used when in C++, as a GCC extension. 2107QualType ASTContext::getUnsignedWCharType() const { 2108 // FIXME: derive from "Target" ? 2109 return UnsignedIntTy; 2110} 2111 2112/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2113/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2114QualType ASTContext::getPointerDiffType() const { 2115 return getFromTargetType(Target.getPtrDiffType(0)); 2116} 2117 2118//===----------------------------------------------------------------------===// 2119// Type Operators 2120//===----------------------------------------------------------------------===// 2121 2122/// getCanonicalType - Return the canonical (structural) type corresponding to 2123/// the specified potentially non-canonical type. The non-canonical version 2124/// of a type may have many "decorated" versions of types. Decorators can 2125/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2126/// to be free of any of these, allowing two canonical types to be compared 2127/// for exact equality with a simple pointer comparison. 2128CanQualType ASTContext::getCanonicalType(QualType T) { 2129 QualifierCollector Quals; 2130 const Type *Ptr = Quals.strip(T); 2131 QualType CanType = Ptr->getCanonicalTypeInternal(); 2132 2133 // The canonical internal type will be the canonical type *except* 2134 // that we push type qualifiers down through array types. 2135 2136 // If there are no new qualifiers to push down, stop here. 2137 if (!Quals.hasQualifiers()) 2138 return CanQualType::CreateUnsafe(CanType); 2139 2140 // If the type qualifiers are on an array type, get the canonical 2141 // type of the array with the qualifiers applied to the element 2142 // type. 2143 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2144 if (!AT) 2145 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2146 2147 // Get the canonical version of the element with the extra qualifiers on it. 2148 // This can recursively sink qualifiers through multiple levels of arrays. 2149 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2150 NewEltTy = getCanonicalType(NewEltTy); 2151 2152 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2153 return CanQualType::CreateUnsafe( 2154 getConstantArrayType(NewEltTy, CAT->getSize(), 2155 CAT->getSizeModifier(), 2156 CAT->getIndexTypeCVRQualifiers())); 2157 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2158 return CanQualType::CreateUnsafe( 2159 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2160 IAT->getIndexTypeCVRQualifiers())); 2161 2162 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2163 return CanQualType::CreateUnsafe( 2164 getDependentSizedArrayType(NewEltTy, 2165 DSAT->getSizeExpr() ? 2166 DSAT->getSizeExpr()->Retain() : 0, 2167 DSAT->getSizeModifier(), 2168 DSAT->getIndexTypeCVRQualifiers(), 2169 DSAT->getBracketsRange())); 2170 2171 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2172 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2173 VAT->getSizeExpr() ? 2174 VAT->getSizeExpr()->Retain() : 0, 2175 VAT->getSizeModifier(), 2176 VAT->getIndexTypeCVRQualifiers(), 2177 VAT->getBracketsRange())); 2178} 2179 2180TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2181 // If this template name refers to a template, the canonical 2182 // template name merely stores the template itself. 2183 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2184 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2185 2186 // If this template name refers to a set of overloaded function templates, 2187 /// the canonical template name merely stores the set of function templates. 2188 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) { 2189 OverloadedFunctionDecl *CanonOvl = 0; 2190 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 2191 FEnd = Ovl->function_end(); 2192 F != FEnd; ++F) { 2193 Decl *Canon = F->get()->getCanonicalDecl(); 2194 if (CanonOvl || Canon != F->get()) { 2195 if (!CanonOvl) 2196 CanonOvl = OverloadedFunctionDecl::Create(*this, 2197 Ovl->getDeclContext(), 2198 Ovl->getDeclName()); 2199 2200 CanonOvl->addOverload( 2201 AnyFunctionDecl::getFromNamedDecl(cast<NamedDecl>(Canon))); 2202 } 2203 } 2204 2205 return TemplateName(CanonOvl? CanonOvl : Ovl); 2206 } 2207 2208 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2209 assert(DTN && "Non-dependent template names must refer to template decls."); 2210 return DTN->CanonicalTemplateName; 2211} 2212 2213TemplateArgument 2214ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2215 switch (Arg.getKind()) { 2216 case TemplateArgument::Null: 2217 return Arg; 2218 2219 case TemplateArgument::Expression: 2220 // FIXME: Build canonical expression? 2221 return Arg; 2222 2223 case TemplateArgument::Declaration: 2224 return TemplateArgument(SourceLocation(), 2225 Arg.getAsDecl()->getCanonicalDecl()); 2226 2227 case TemplateArgument::Integral: 2228 return TemplateArgument(SourceLocation(), 2229 *Arg.getAsIntegral(), 2230 getCanonicalType(Arg.getIntegralType())); 2231 2232 case TemplateArgument::Type: 2233 return TemplateArgument(SourceLocation(), 2234 getCanonicalType(Arg.getAsType())); 2235 2236 case TemplateArgument::Pack: { 2237 // FIXME: Allocate in ASTContext 2238 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2239 unsigned Idx = 0; 2240 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2241 AEnd = Arg.pack_end(); 2242 A != AEnd; (void)++A, ++Idx) 2243 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2244 2245 TemplateArgument Result; 2246 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2247 return Result; 2248 } 2249 } 2250 2251 // Silence GCC warning 2252 assert(false && "Unhandled template argument kind"); 2253 return TemplateArgument(); 2254} 2255 2256NestedNameSpecifier * 2257ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2258 if (!NNS) 2259 return 0; 2260 2261 switch (NNS->getKind()) { 2262 case NestedNameSpecifier::Identifier: 2263 // Canonicalize the prefix but keep the identifier the same. 2264 return NestedNameSpecifier::Create(*this, 2265 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2266 NNS->getAsIdentifier()); 2267 2268 case NestedNameSpecifier::Namespace: 2269 // A namespace is canonical; build a nested-name-specifier with 2270 // this namespace and no prefix. 2271 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2272 2273 case NestedNameSpecifier::TypeSpec: 2274 case NestedNameSpecifier::TypeSpecWithTemplate: { 2275 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2276 return NestedNameSpecifier::Create(*this, 0, 2277 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2278 T.getTypePtr()); 2279 } 2280 2281 case NestedNameSpecifier::Global: 2282 // The global specifier is canonical and unique. 2283 return NNS; 2284 } 2285 2286 // Required to silence a GCC warning 2287 return 0; 2288} 2289 2290 2291const ArrayType *ASTContext::getAsArrayType(QualType T) { 2292 // Handle the non-qualified case efficiently. 2293 if (!T.hasQualifiers()) { 2294 // Handle the common positive case fast. 2295 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2296 return AT; 2297 } 2298 2299 // Handle the common negative case fast. 2300 QualType CType = T->getCanonicalTypeInternal(); 2301 if (!isa<ArrayType>(CType)) 2302 return 0; 2303 2304 // Apply any qualifiers from the array type to the element type. This 2305 // implements C99 6.7.3p8: "If the specification of an array type includes 2306 // any type qualifiers, the element type is so qualified, not the array type." 2307 2308 // If we get here, we either have type qualifiers on the type, or we have 2309 // sugar such as a typedef in the way. If we have type qualifiers on the type 2310 // we must propagate them down into the element type. 2311 2312 QualifierCollector Qs; 2313 const Type *Ty = Qs.strip(T.getDesugaredType()); 2314 2315 // If we have a simple case, just return now. 2316 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2317 if (ATy == 0 || Qs.empty()) 2318 return ATy; 2319 2320 // Otherwise, we have an array and we have qualifiers on it. Push the 2321 // qualifiers into the array element type and return a new array type. 2322 // Get the canonical version of the element with the extra qualifiers on it. 2323 // This can recursively sink qualifiers through multiple levels of arrays. 2324 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2325 2326 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2327 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2328 CAT->getSizeModifier(), 2329 CAT->getIndexTypeCVRQualifiers())); 2330 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2331 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2332 IAT->getSizeModifier(), 2333 IAT->getIndexTypeCVRQualifiers())); 2334 2335 if (const DependentSizedArrayType *DSAT 2336 = dyn_cast<DependentSizedArrayType>(ATy)) 2337 return cast<ArrayType>( 2338 getDependentSizedArrayType(NewEltTy, 2339 DSAT->getSizeExpr() ? 2340 DSAT->getSizeExpr()->Retain() : 0, 2341 DSAT->getSizeModifier(), 2342 DSAT->getIndexTypeCVRQualifiers(), 2343 DSAT->getBracketsRange())); 2344 2345 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2346 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2347 VAT->getSizeExpr() ? 2348 VAT->getSizeExpr()->Retain() : 0, 2349 VAT->getSizeModifier(), 2350 VAT->getIndexTypeCVRQualifiers(), 2351 VAT->getBracketsRange())); 2352} 2353 2354 2355/// getArrayDecayedType - Return the properly qualified result of decaying the 2356/// specified array type to a pointer. This operation is non-trivial when 2357/// handling typedefs etc. The canonical type of "T" must be an array type, 2358/// this returns a pointer to a properly qualified element of the array. 2359/// 2360/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2361QualType ASTContext::getArrayDecayedType(QualType Ty) { 2362 // Get the element type with 'getAsArrayType' so that we don't lose any 2363 // typedefs in the element type of the array. This also handles propagation 2364 // of type qualifiers from the array type into the element type if present 2365 // (C99 6.7.3p8). 2366 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2367 assert(PrettyArrayType && "Not an array type!"); 2368 2369 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2370 2371 // int x[restrict 4] -> int *restrict 2372 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2373} 2374 2375QualType ASTContext::getBaseElementType(QualType QT) { 2376 QualifierCollector Qs; 2377 while (true) { 2378 const Type *UT = Qs.strip(QT); 2379 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2380 QT = AT->getElementType(); 2381 } else { 2382 return Qs.apply(QT); 2383 } 2384 } 2385} 2386 2387QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2388 QualType ElemTy = AT->getElementType(); 2389 2390 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2391 return getBaseElementType(AT); 2392 2393 return ElemTy; 2394} 2395 2396/// getConstantArrayElementCount - Returns number of constant array elements. 2397uint64_t 2398ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2399 uint64_t ElementCount = 1; 2400 do { 2401 ElementCount *= CA->getSize().getZExtValue(); 2402 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2403 } while (CA); 2404 return ElementCount; 2405} 2406 2407/// getFloatingRank - Return a relative rank for floating point types. 2408/// This routine will assert if passed a built-in type that isn't a float. 2409static FloatingRank getFloatingRank(QualType T) { 2410 if (const ComplexType *CT = T->getAs<ComplexType>()) 2411 return getFloatingRank(CT->getElementType()); 2412 2413 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2414 switch (T->getAs<BuiltinType>()->getKind()) { 2415 default: assert(0 && "getFloatingRank(): not a floating type"); 2416 case BuiltinType::Float: return FloatRank; 2417 case BuiltinType::Double: return DoubleRank; 2418 case BuiltinType::LongDouble: return LongDoubleRank; 2419 } 2420} 2421 2422/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2423/// point or a complex type (based on typeDomain/typeSize). 2424/// 'typeDomain' is a real floating point or complex type. 2425/// 'typeSize' is a real floating point or complex type. 2426QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2427 QualType Domain) const { 2428 FloatingRank EltRank = getFloatingRank(Size); 2429 if (Domain->isComplexType()) { 2430 switch (EltRank) { 2431 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2432 case FloatRank: return FloatComplexTy; 2433 case DoubleRank: return DoubleComplexTy; 2434 case LongDoubleRank: return LongDoubleComplexTy; 2435 } 2436 } 2437 2438 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2439 switch (EltRank) { 2440 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2441 case FloatRank: return FloatTy; 2442 case DoubleRank: return DoubleTy; 2443 case LongDoubleRank: return LongDoubleTy; 2444 } 2445} 2446 2447/// getFloatingTypeOrder - Compare the rank of the two specified floating 2448/// point types, ignoring the domain of the type (i.e. 'double' == 2449/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2450/// LHS < RHS, return -1. 2451int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2452 FloatingRank LHSR = getFloatingRank(LHS); 2453 FloatingRank RHSR = getFloatingRank(RHS); 2454 2455 if (LHSR == RHSR) 2456 return 0; 2457 if (LHSR > RHSR) 2458 return 1; 2459 return -1; 2460} 2461 2462/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2463/// routine will assert if passed a built-in type that isn't an integer or enum, 2464/// or if it is not canonicalized. 2465unsigned ASTContext::getIntegerRank(Type *T) { 2466 assert(T->isCanonical() && "T should be canonicalized"); 2467 if (EnumType* ET = dyn_cast<EnumType>(T)) 2468 T = ET->getDecl()->getIntegerType().getTypePtr(); 2469 2470 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2471 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2472 2473 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2474 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2475 2476 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2477 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2478 2479 // There are two things which impact the integer rank: the width, and 2480 // the ordering of builtins. The builtin ordering is encoded in the 2481 // bottom three bits; the width is encoded in the bits above that. 2482 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2483 return FWIT->getWidth() << 3; 2484 2485 switch (cast<BuiltinType>(T)->getKind()) { 2486 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2487 case BuiltinType::Bool: 2488 return 1 + (getIntWidth(BoolTy) << 3); 2489 case BuiltinType::Char_S: 2490 case BuiltinType::Char_U: 2491 case BuiltinType::SChar: 2492 case BuiltinType::UChar: 2493 return 2 + (getIntWidth(CharTy) << 3); 2494 case BuiltinType::Short: 2495 case BuiltinType::UShort: 2496 return 3 + (getIntWidth(ShortTy) << 3); 2497 case BuiltinType::Int: 2498 case BuiltinType::UInt: 2499 return 4 + (getIntWidth(IntTy) << 3); 2500 case BuiltinType::Long: 2501 case BuiltinType::ULong: 2502 return 5 + (getIntWidth(LongTy) << 3); 2503 case BuiltinType::LongLong: 2504 case BuiltinType::ULongLong: 2505 return 6 + (getIntWidth(LongLongTy) << 3); 2506 case BuiltinType::Int128: 2507 case BuiltinType::UInt128: 2508 return 7 + (getIntWidth(Int128Ty) << 3); 2509 } 2510} 2511 2512/// \brief Whether this is a promotable bitfield reference according 2513/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2514/// 2515/// \returns the type this bit-field will promote to, or NULL if no 2516/// promotion occurs. 2517QualType ASTContext::isPromotableBitField(Expr *E) { 2518 FieldDecl *Field = E->getBitField(); 2519 if (!Field) 2520 return QualType(); 2521 2522 QualType FT = Field->getType(); 2523 2524 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2525 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2526 uint64_t IntSize = getTypeSize(IntTy); 2527 // GCC extension compatibility: if the bit-field size is less than or equal 2528 // to the size of int, it gets promoted no matter what its type is. 2529 // For instance, unsigned long bf : 4 gets promoted to signed int. 2530 if (BitWidth < IntSize) 2531 return IntTy; 2532 2533 if (BitWidth == IntSize) 2534 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2535 2536 // Types bigger than int are not subject to promotions, and therefore act 2537 // like the base type. 2538 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2539 // is ridiculous. 2540 return QualType(); 2541} 2542 2543/// getPromotedIntegerType - Returns the type that Promotable will 2544/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2545/// integer type. 2546QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2547 assert(!Promotable.isNull()); 2548 assert(Promotable->isPromotableIntegerType()); 2549 if (Promotable->isSignedIntegerType()) 2550 return IntTy; 2551 uint64_t PromotableSize = getTypeSize(Promotable); 2552 uint64_t IntSize = getTypeSize(IntTy); 2553 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2554 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2555} 2556 2557/// getIntegerTypeOrder - Returns the highest ranked integer type: 2558/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2559/// LHS < RHS, return -1. 2560int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2561 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2562 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2563 if (LHSC == RHSC) return 0; 2564 2565 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2566 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2567 2568 unsigned LHSRank = getIntegerRank(LHSC); 2569 unsigned RHSRank = getIntegerRank(RHSC); 2570 2571 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2572 if (LHSRank == RHSRank) return 0; 2573 return LHSRank > RHSRank ? 1 : -1; 2574 } 2575 2576 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2577 if (LHSUnsigned) { 2578 // If the unsigned [LHS] type is larger, return it. 2579 if (LHSRank >= RHSRank) 2580 return 1; 2581 2582 // If the signed type can represent all values of the unsigned type, it 2583 // wins. Because we are dealing with 2's complement and types that are 2584 // powers of two larger than each other, this is always safe. 2585 return -1; 2586 } 2587 2588 // If the unsigned [RHS] type is larger, return it. 2589 if (RHSRank >= LHSRank) 2590 return -1; 2591 2592 // If the signed type can represent all values of the unsigned type, it 2593 // wins. Because we are dealing with 2's complement and types that are 2594 // powers of two larger than each other, this is always safe. 2595 return 1; 2596} 2597 2598// getCFConstantStringType - Return the type used for constant CFStrings. 2599QualType ASTContext::getCFConstantStringType() { 2600 if (!CFConstantStringTypeDecl) { 2601 CFConstantStringTypeDecl = 2602 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2603 &Idents.get("NSConstantString")); 2604 QualType FieldTypes[4]; 2605 2606 // const int *isa; 2607 FieldTypes[0] = getPointerType(IntTy.withConst()); 2608 // int flags; 2609 FieldTypes[1] = IntTy; 2610 // const char *str; 2611 FieldTypes[2] = getPointerType(CharTy.withConst()); 2612 // long length; 2613 FieldTypes[3] = LongTy; 2614 2615 // Create fields 2616 for (unsigned i = 0; i < 4; ++i) { 2617 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2618 SourceLocation(), 0, 2619 FieldTypes[i], /*DInfo=*/0, 2620 /*BitWidth=*/0, 2621 /*Mutable=*/false); 2622 CFConstantStringTypeDecl->addDecl(Field); 2623 } 2624 2625 CFConstantStringTypeDecl->completeDefinition(*this); 2626 } 2627 2628 return getTagDeclType(CFConstantStringTypeDecl); 2629} 2630 2631void ASTContext::setCFConstantStringType(QualType T) { 2632 const RecordType *Rec = T->getAs<RecordType>(); 2633 assert(Rec && "Invalid CFConstantStringType"); 2634 CFConstantStringTypeDecl = Rec->getDecl(); 2635} 2636 2637QualType ASTContext::getObjCFastEnumerationStateType() { 2638 if (!ObjCFastEnumerationStateTypeDecl) { 2639 ObjCFastEnumerationStateTypeDecl = 2640 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2641 &Idents.get("__objcFastEnumerationState")); 2642 2643 QualType FieldTypes[] = { 2644 UnsignedLongTy, 2645 getPointerType(ObjCIdTypedefType), 2646 getPointerType(UnsignedLongTy), 2647 getConstantArrayType(UnsignedLongTy, 2648 llvm::APInt(32, 5), ArrayType::Normal, 0) 2649 }; 2650 2651 for (size_t i = 0; i < 4; ++i) { 2652 FieldDecl *Field = FieldDecl::Create(*this, 2653 ObjCFastEnumerationStateTypeDecl, 2654 SourceLocation(), 0, 2655 FieldTypes[i], /*DInfo=*/0, 2656 /*BitWidth=*/0, 2657 /*Mutable=*/false); 2658 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2659 } 2660 2661 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2662 } 2663 2664 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2665} 2666 2667void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2668 const RecordType *Rec = T->getAs<RecordType>(); 2669 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2670 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2671} 2672 2673// This returns true if a type has been typedefed to BOOL: 2674// typedef <type> BOOL; 2675static bool isTypeTypedefedAsBOOL(QualType T) { 2676 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2677 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2678 return II->isStr("BOOL"); 2679 2680 return false; 2681} 2682 2683/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2684/// purpose. 2685int ASTContext::getObjCEncodingTypeSize(QualType type) { 2686 uint64_t sz = getTypeSize(type); 2687 2688 // Make all integer and enum types at least as large as an int 2689 if (sz > 0 && type->isIntegralType()) 2690 sz = std::max(sz, getTypeSize(IntTy)); 2691 // Treat arrays as pointers, since that's how they're passed in. 2692 else if (type->isArrayType()) 2693 sz = getTypeSize(VoidPtrTy); 2694 return sz / getTypeSize(CharTy); 2695} 2696 2697/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2698/// declaration. 2699void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2700 std::string& S) { 2701 // FIXME: This is not very efficient. 2702 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2703 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2704 // Encode result type. 2705 getObjCEncodingForType(Decl->getResultType(), S); 2706 // Compute size of all parameters. 2707 // Start with computing size of a pointer in number of bytes. 2708 // FIXME: There might(should) be a better way of doing this computation! 2709 SourceLocation Loc; 2710 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2711 // The first two arguments (self and _cmd) are pointers; account for 2712 // their size. 2713 int ParmOffset = 2 * PtrSize; 2714 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2715 E = Decl->param_end(); PI != E; ++PI) { 2716 QualType PType = (*PI)->getType(); 2717 int sz = getObjCEncodingTypeSize(PType); 2718 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2719 ParmOffset += sz; 2720 } 2721 S += llvm::utostr(ParmOffset); 2722 S += "@0:"; 2723 S += llvm::utostr(PtrSize); 2724 2725 // Argument types. 2726 ParmOffset = 2 * PtrSize; 2727 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2728 E = Decl->param_end(); PI != E; ++PI) { 2729 ParmVarDecl *PVDecl = *PI; 2730 QualType PType = PVDecl->getOriginalType(); 2731 if (const ArrayType *AT = 2732 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2733 // Use array's original type only if it has known number of 2734 // elements. 2735 if (!isa<ConstantArrayType>(AT)) 2736 PType = PVDecl->getType(); 2737 } else if (PType->isFunctionType()) 2738 PType = PVDecl->getType(); 2739 // Process argument qualifiers for user supplied arguments; such as, 2740 // 'in', 'inout', etc. 2741 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2742 getObjCEncodingForType(PType, S); 2743 S += llvm::utostr(ParmOffset); 2744 ParmOffset += getObjCEncodingTypeSize(PType); 2745 } 2746} 2747 2748/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2749/// property declaration. If non-NULL, Container must be either an 2750/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2751/// NULL when getting encodings for protocol properties. 2752/// Property attributes are stored as a comma-delimited C string. The simple 2753/// attributes readonly and bycopy are encoded as single characters. The 2754/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2755/// encoded as single characters, followed by an identifier. Property types 2756/// are also encoded as a parametrized attribute. The characters used to encode 2757/// these attributes are defined by the following enumeration: 2758/// @code 2759/// enum PropertyAttributes { 2760/// kPropertyReadOnly = 'R', // property is read-only. 2761/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2762/// kPropertyByref = '&', // property is a reference to the value last assigned 2763/// kPropertyDynamic = 'D', // property is dynamic 2764/// kPropertyGetter = 'G', // followed by getter selector name 2765/// kPropertySetter = 'S', // followed by setter selector name 2766/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2767/// kPropertyType = 't' // followed by old-style type encoding. 2768/// kPropertyWeak = 'W' // 'weak' property 2769/// kPropertyStrong = 'P' // property GC'able 2770/// kPropertyNonAtomic = 'N' // property non-atomic 2771/// }; 2772/// @endcode 2773void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2774 const Decl *Container, 2775 std::string& S) { 2776 // Collect information from the property implementation decl(s). 2777 bool Dynamic = false; 2778 ObjCPropertyImplDecl *SynthesizePID = 0; 2779 2780 // FIXME: Duplicated code due to poor abstraction. 2781 if (Container) { 2782 if (const ObjCCategoryImplDecl *CID = 2783 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2784 for (ObjCCategoryImplDecl::propimpl_iterator 2785 i = CID->propimpl_begin(), e = CID->propimpl_end(); 2786 i != e; ++i) { 2787 ObjCPropertyImplDecl *PID = *i; 2788 if (PID->getPropertyDecl() == PD) { 2789 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2790 Dynamic = true; 2791 } else { 2792 SynthesizePID = PID; 2793 } 2794 } 2795 } 2796 } else { 2797 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2798 for (ObjCCategoryImplDecl::propimpl_iterator 2799 i = OID->propimpl_begin(), e = OID->propimpl_end(); 2800 i != e; ++i) { 2801 ObjCPropertyImplDecl *PID = *i; 2802 if (PID->getPropertyDecl() == PD) { 2803 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2804 Dynamic = true; 2805 } else { 2806 SynthesizePID = PID; 2807 } 2808 } 2809 } 2810 } 2811 } 2812 2813 // FIXME: This is not very efficient. 2814 S = "T"; 2815 2816 // Encode result type. 2817 // GCC has some special rules regarding encoding of properties which 2818 // closely resembles encoding of ivars. 2819 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2820 true /* outermost type */, 2821 true /* encoding for property */); 2822 2823 if (PD->isReadOnly()) { 2824 S += ",R"; 2825 } else { 2826 switch (PD->getSetterKind()) { 2827 case ObjCPropertyDecl::Assign: break; 2828 case ObjCPropertyDecl::Copy: S += ",C"; break; 2829 case ObjCPropertyDecl::Retain: S += ",&"; break; 2830 } 2831 } 2832 2833 // It really isn't clear at all what this means, since properties 2834 // are "dynamic by default". 2835 if (Dynamic) 2836 S += ",D"; 2837 2838 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2839 S += ",N"; 2840 2841 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2842 S += ",G"; 2843 S += PD->getGetterName().getAsString(); 2844 } 2845 2846 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2847 S += ",S"; 2848 S += PD->getSetterName().getAsString(); 2849 } 2850 2851 if (SynthesizePID) { 2852 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2853 S += ",V"; 2854 S += OID->getNameAsString(); 2855 } 2856 2857 // FIXME: OBJCGC: weak & strong 2858} 2859 2860/// getLegacyIntegralTypeEncoding - 2861/// Another legacy compatibility encoding: 32-bit longs are encoded as 2862/// 'l' or 'L' , but not always. For typedefs, we need to use 2863/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2864/// 2865void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2866 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 2867 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 2868 if (BT->getKind() == BuiltinType::ULong && 2869 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2870 PointeeTy = UnsignedIntTy; 2871 else 2872 if (BT->getKind() == BuiltinType::Long && 2873 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2874 PointeeTy = IntTy; 2875 } 2876 } 2877} 2878 2879void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2880 const FieldDecl *Field) { 2881 // We follow the behavior of gcc, expanding structures which are 2882 // directly pointed to, and expanding embedded structures. Note that 2883 // these rules are sufficient to prevent recursive encoding of the 2884 // same type. 2885 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2886 true /* outermost type */); 2887} 2888 2889static void EncodeBitField(const ASTContext *Context, std::string& S, 2890 const FieldDecl *FD) { 2891 const Expr *E = FD->getBitWidth(); 2892 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2893 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2894 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2895 S += 'b'; 2896 S += llvm::utostr(N); 2897} 2898 2899void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2900 bool ExpandPointedToStructures, 2901 bool ExpandStructures, 2902 const FieldDecl *FD, 2903 bool OutermostType, 2904 bool EncodingProperty) { 2905 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 2906 if (FD && FD->isBitField()) 2907 return EncodeBitField(this, S, FD); 2908 char encoding; 2909 switch (BT->getKind()) { 2910 default: assert(0 && "Unhandled builtin type kind"); 2911 case BuiltinType::Void: encoding = 'v'; break; 2912 case BuiltinType::Bool: encoding = 'B'; break; 2913 case BuiltinType::Char_U: 2914 case BuiltinType::UChar: encoding = 'C'; break; 2915 case BuiltinType::UShort: encoding = 'S'; break; 2916 case BuiltinType::UInt: encoding = 'I'; break; 2917 case BuiltinType::ULong: 2918 encoding = 2919 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2920 break; 2921 case BuiltinType::UInt128: encoding = 'T'; break; 2922 case BuiltinType::ULongLong: encoding = 'Q'; break; 2923 case BuiltinType::Char_S: 2924 case BuiltinType::SChar: encoding = 'c'; break; 2925 case BuiltinType::Short: encoding = 's'; break; 2926 case BuiltinType::Int: encoding = 'i'; break; 2927 case BuiltinType::Long: 2928 encoding = 2929 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2930 break; 2931 case BuiltinType::LongLong: encoding = 'q'; break; 2932 case BuiltinType::Int128: encoding = 't'; break; 2933 case BuiltinType::Float: encoding = 'f'; break; 2934 case BuiltinType::Double: encoding = 'd'; break; 2935 case BuiltinType::LongDouble: encoding = 'd'; break; 2936 } 2937 2938 S += encoding; 2939 return; 2940 } 2941 2942 if (const ComplexType *CT = T->getAs<ComplexType>()) { 2943 S += 'j'; 2944 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2945 false); 2946 return; 2947 } 2948 2949 if (const PointerType *PT = T->getAs<PointerType>()) { 2950 QualType PointeeTy = PT->getPointeeType(); 2951 bool isReadOnly = false; 2952 // For historical/compatibility reasons, the read-only qualifier of the 2953 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2954 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2955 // Also, do not emit the 'r' for anything but the outermost type! 2956 if (isa<TypedefType>(T.getTypePtr())) { 2957 if (OutermostType && T.isConstQualified()) { 2958 isReadOnly = true; 2959 S += 'r'; 2960 } 2961 } else if (OutermostType) { 2962 QualType P = PointeeTy; 2963 while (P->getAs<PointerType>()) 2964 P = P->getAs<PointerType>()->getPointeeType(); 2965 if (P.isConstQualified()) { 2966 isReadOnly = true; 2967 S += 'r'; 2968 } 2969 } 2970 if (isReadOnly) { 2971 // Another legacy compatibility encoding. Some ObjC qualifier and type 2972 // combinations need to be rearranged. 2973 // Rewrite "in const" from "nr" to "rn" 2974 const char * s = S.c_str(); 2975 int len = S.length(); 2976 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2977 std::string replace = "rn"; 2978 S.replace(S.end()-2, S.end(), replace); 2979 } 2980 } 2981 if (isObjCSelType(PointeeTy)) { 2982 S += ':'; 2983 return; 2984 } 2985 2986 if (PointeeTy->isCharType()) { 2987 // char pointer types should be encoded as '*' unless it is a 2988 // type that has been typedef'd to 'BOOL'. 2989 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2990 S += '*'; 2991 return; 2992 } 2993 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 2994 // GCC binary compat: Need to convert "struct objc_class *" to "#". 2995 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 2996 S += '#'; 2997 return; 2998 } 2999 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3000 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3001 S += '@'; 3002 return; 3003 } 3004 // fall through... 3005 } 3006 S += '^'; 3007 getLegacyIntegralTypeEncoding(PointeeTy); 3008 3009 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3010 NULL); 3011 return; 3012 } 3013 3014 if (const ArrayType *AT = 3015 // Ignore type qualifiers etc. 3016 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3017 if (isa<IncompleteArrayType>(AT)) { 3018 // Incomplete arrays are encoded as a pointer to the array element. 3019 S += '^'; 3020 3021 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3022 false, ExpandStructures, FD); 3023 } else { 3024 S += '['; 3025 3026 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3027 S += llvm::utostr(CAT->getSize().getZExtValue()); 3028 else { 3029 //Variable length arrays are encoded as a regular array with 0 elements. 3030 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3031 S += '0'; 3032 } 3033 3034 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3035 false, ExpandStructures, FD); 3036 S += ']'; 3037 } 3038 return; 3039 } 3040 3041 if (T->getAs<FunctionType>()) { 3042 S += '?'; 3043 return; 3044 } 3045 3046 if (const RecordType *RTy = T->getAs<RecordType>()) { 3047 RecordDecl *RDecl = RTy->getDecl(); 3048 S += RDecl->isUnion() ? '(' : '{'; 3049 // Anonymous structures print as '?' 3050 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3051 S += II->getName(); 3052 } else { 3053 S += '?'; 3054 } 3055 if (ExpandStructures) { 3056 S += '='; 3057 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3058 FieldEnd = RDecl->field_end(); 3059 Field != FieldEnd; ++Field) { 3060 if (FD) { 3061 S += '"'; 3062 S += Field->getNameAsString(); 3063 S += '"'; 3064 } 3065 3066 // Special case bit-fields. 3067 if (Field->isBitField()) { 3068 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3069 (*Field)); 3070 } else { 3071 QualType qt = Field->getType(); 3072 getLegacyIntegralTypeEncoding(qt); 3073 getObjCEncodingForTypeImpl(qt, S, false, true, 3074 FD); 3075 } 3076 } 3077 } 3078 S += RDecl->isUnion() ? ')' : '}'; 3079 return; 3080 } 3081 3082 if (T->isEnumeralType()) { 3083 if (FD && FD->isBitField()) 3084 EncodeBitField(this, S, FD); 3085 else 3086 S += 'i'; 3087 return; 3088 } 3089 3090 if (T->isBlockPointerType()) { 3091 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3092 return; 3093 } 3094 3095 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3096 // @encode(class_name) 3097 ObjCInterfaceDecl *OI = OIT->getDecl(); 3098 S += '{'; 3099 const IdentifierInfo *II = OI->getIdentifier(); 3100 S += II->getName(); 3101 S += '='; 3102 llvm::SmallVector<FieldDecl*, 32> RecFields; 3103 CollectObjCIvars(OI, RecFields); 3104 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3105 if (RecFields[i]->isBitField()) 3106 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3107 RecFields[i]); 3108 else 3109 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3110 FD); 3111 } 3112 S += '}'; 3113 return; 3114 } 3115 3116 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3117 if (OPT->isObjCIdType()) { 3118 S += '@'; 3119 return; 3120 } 3121 3122 if (OPT->isObjCClassType()) { 3123 S += '#'; 3124 return; 3125 } 3126 3127 if (OPT->isObjCQualifiedIdType()) { 3128 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3129 ExpandPointedToStructures, 3130 ExpandStructures, FD); 3131 if (FD || EncodingProperty) { 3132 // Note that we do extended encoding of protocol qualifer list 3133 // Only when doing ivar or property encoding. 3134 S += '"'; 3135 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3136 E = OPT->qual_end(); I != E; ++I) { 3137 S += '<'; 3138 S += (*I)->getNameAsString(); 3139 S += '>'; 3140 } 3141 S += '"'; 3142 } 3143 return; 3144 } 3145 3146 QualType PointeeTy = OPT->getPointeeType(); 3147 if (!EncodingProperty && 3148 isa<TypedefType>(PointeeTy.getTypePtr())) { 3149 // Another historical/compatibility reason. 3150 // We encode the underlying type which comes out as 3151 // {...}; 3152 S += '^'; 3153 getObjCEncodingForTypeImpl(PointeeTy, S, 3154 false, ExpandPointedToStructures, 3155 NULL); 3156 return; 3157 } 3158 3159 S += '@'; 3160 if (FD || EncodingProperty) { 3161 S += '"'; 3162 S += OPT->getInterfaceDecl()->getNameAsCString(); 3163 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3164 E = OPT->qual_end(); I != E; ++I) { 3165 S += '<'; 3166 S += (*I)->getNameAsString(); 3167 S += '>'; 3168 } 3169 S += '"'; 3170 } 3171 return; 3172 } 3173 3174 assert(0 && "@encode for type not implemented!"); 3175} 3176 3177void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3178 std::string& S) const { 3179 if (QT & Decl::OBJC_TQ_In) 3180 S += 'n'; 3181 if (QT & Decl::OBJC_TQ_Inout) 3182 S += 'N'; 3183 if (QT & Decl::OBJC_TQ_Out) 3184 S += 'o'; 3185 if (QT & Decl::OBJC_TQ_Bycopy) 3186 S += 'O'; 3187 if (QT & Decl::OBJC_TQ_Byref) 3188 S += 'R'; 3189 if (QT & Decl::OBJC_TQ_Oneway) 3190 S += 'V'; 3191} 3192 3193void ASTContext::setBuiltinVaListType(QualType T) { 3194 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3195 3196 BuiltinVaListType = T; 3197} 3198 3199void ASTContext::setObjCIdType(QualType T) { 3200 ObjCIdTypedefType = T; 3201} 3202 3203void ASTContext::setObjCSelType(QualType T) { 3204 ObjCSelType = T; 3205 3206 const TypedefType *TT = T->getAs<TypedefType>(); 3207 if (!TT) 3208 return; 3209 TypedefDecl *TD = TT->getDecl(); 3210 3211 // typedef struct objc_selector *SEL; 3212 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3213 if (!ptr) 3214 return; 3215 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3216 if (!rec) 3217 return; 3218 SelStructType = rec; 3219} 3220 3221void ASTContext::setObjCProtoType(QualType QT) { 3222 ObjCProtoType = QT; 3223} 3224 3225void ASTContext::setObjCClassType(QualType T) { 3226 ObjCClassTypedefType = T; 3227} 3228 3229void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3230 assert(ObjCConstantStringType.isNull() && 3231 "'NSConstantString' type already set!"); 3232 3233 ObjCConstantStringType = getObjCInterfaceType(Decl); 3234} 3235 3236/// \brief Retrieve the template name that represents a qualified 3237/// template name such as \c std::vector. 3238TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3239 bool TemplateKeyword, 3240 TemplateDecl *Template) { 3241 llvm::FoldingSetNodeID ID; 3242 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3243 3244 void *InsertPos = 0; 3245 QualifiedTemplateName *QTN = 3246 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3247 if (!QTN) { 3248 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3249 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3250 } 3251 3252 return TemplateName(QTN); 3253} 3254 3255/// \brief Retrieve the template name that represents a qualified 3256/// template name such as \c std::vector. 3257TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3258 bool TemplateKeyword, 3259 OverloadedFunctionDecl *Template) { 3260 llvm::FoldingSetNodeID ID; 3261 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3262 3263 void *InsertPos = 0; 3264 QualifiedTemplateName *QTN = 3265 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3266 if (!QTN) { 3267 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3268 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3269 } 3270 3271 return TemplateName(QTN); 3272} 3273 3274/// \brief Retrieve the template name that represents a dependent 3275/// template name such as \c MetaFun::template apply. 3276TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3277 const IdentifierInfo *Name) { 3278 assert((!NNS || NNS->isDependent()) && 3279 "Nested name specifier must be dependent"); 3280 3281 llvm::FoldingSetNodeID ID; 3282 DependentTemplateName::Profile(ID, NNS, Name); 3283 3284 void *InsertPos = 0; 3285 DependentTemplateName *QTN = 3286 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3287 3288 if (QTN) 3289 return TemplateName(QTN); 3290 3291 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3292 if (CanonNNS == NNS) { 3293 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3294 } else { 3295 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3296 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3297 } 3298 3299 DependentTemplateNames.InsertNode(QTN, InsertPos); 3300 return TemplateName(QTN); 3301} 3302 3303/// getFromTargetType - Given one of the integer types provided by 3304/// TargetInfo, produce the corresponding type. The unsigned @p Type 3305/// is actually a value of type @c TargetInfo::IntType. 3306QualType ASTContext::getFromTargetType(unsigned Type) const { 3307 switch (Type) { 3308 case TargetInfo::NoInt: return QualType(); 3309 case TargetInfo::SignedShort: return ShortTy; 3310 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3311 case TargetInfo::SignedInt: return IntTy; 3312 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3313 case TargetInfo::SignedLong: return LongTy; 3314 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3315 case TargetInfo::SignedLongLong: return LongLongTy; 3316 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3317 } 3318 3319 assert(false && "Unhandled TargetInfo::IntType value"); 3320 return QualType(); 3321} 3322 3323//===----------------------------------------------------------------------===// 3324// Type Predicates. 3325//===----------------------------------------------------------------------===// 3326 3327/// isObjCNSObjectType - Return true if this is an NSObject object using 3328/// NSObject attribute on a c-style pointer type. 3329/// FIXME - Make it work directly on types. 3330/// FIXME: Move to Type. 3331/// 3332bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3333 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3334 if (TypedefDecl *TD = TDT->getDecl()) 3335 if (TD->getAttr<ObjCNSObjectAttr>()) 3336 return true; 3337 } 3338 return false; 3339} 3340 3341/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3342/// garbage collection attribute. 3343/// 3344Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3345 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3346 if (getLangOptions().ObjC1 && 3347 getLangOptions().getGCMode() != LangOptions::NonGC) { 3348 GCAttrs = Ty.getObjCGCAttr(); 3349 // Default behavious under objective-c's gc is for objective-c pointers 3350 // (or pointers to them) be treated as though they were declared 3351 // as __strong. 3352 if (GCAttrs == Qualifiers::GCNone) { 3353 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3354 GCAttrs = Qualifiers::Strong; 3355 else if (Ty->isPointerType()) 3356 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3357 } 3358 // Non-pointers have none gc'able attribute regardless of the attribute 3359 // set on them. 3360 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3361 return Qualifiers::GCNone; 3362 } 3363 return GCAttrs; 3364} 3365 3366//===----------------------------------------------------------------------===// 3367// Type Compatibility Testing 3368//===----------------------------------------------------------------------===// 3369 3370/// areCompatVectorTypes - Return true if the two specified vector types are 3371/// compatible. 3372static bool areCompatVectorTypes(const VectorType *LHS, 3373 const VectorType *RHS) { 3374 assert(LHS->isCanonical() && RHS->isCanonical()); 3375 return LHS->getElementType() == RHS->getElementType() && 3376 LHS->getNumElements() == RHS->getNumElements(); 3377} 3378 3379//===----------------------------------------------------------------------===// 3380// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3381//===----------------------------------------------------------------------===// 3382 3383/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3384/// inheritance hierarchy of 'rProto'. 3385bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3386 ObjCProtocolDecl *rProto) { 3387 if (lProto == rProto) 3388 return true; 3389 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3390 E = rProto->protocol_end(); PI != E; ++PI) 3391 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3392 return true; 3393 return false; 3394} 3395 3396/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3397/// return true if lhs's protocols conform to rhs's protocol; false 3398/// otherwise. 3399bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3400 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3401 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3402 return false; 3403} 3404 3405/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3406/// ObjCQualifiedIDType. 3407bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3408 bool compare) { 3409 // Allow id<P..> and an 'id' or void* type in all cases. 3410 if (lhs->isVoidPointerType() || 3411 lhs->isObjCIdType() || lhs->isObjCClassType()) 3412 return true; 3413 else if (rhs->isVoidPointerType() || 3414 rhs->isObjCIdType() || rhs->isObjCClassType()) 3415 return true; 3416 3417 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3418 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3419 3420 if (!rhsOPT) return false; 3421 3422 if (rhsOPT->qual_empty()) { 3423 // If the RHS is a unqualified interface pointer "NSString*", 3424 // make sure we check the class hierarchy. 3425 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3426 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3427 E = lhsQID->qual_end(); I != E; ++I) { 3428 // when comparing an id<P> on lhs with a static type on rhs, 3429 // see if static class implements all of id's protocols, directly or 3430 // through its super class and categories. 3431 if (!rhsID->ClassImplementsProtocol(*I, true)) 3432 return false; 3433 } 3434 } 3435 // If there are no qualifiers and no interface, we have an 'id'. 3436 return true; 3437 } 3438 // Both the right and left sides have qualifiers. 3439 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3440 E = lhsQID->qual_end(); I != E; ++I) { 3441 ObjCProtocolDecl *lhsProto = *I; 3442 bool match = false; 3443 3444 // when comparing an id<P> on lhs with a static type on rhs, 3445 // see if static class implements all of id's protocols, directly or 3446 // through its super class and categories. 3447 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3448 E = rhsOPT->qual_end(); J != E; ++J) { 3449 ObjCProtocolDecl *rhsProto = *J; 3450 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3451 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3452 match = true; 3453 break; 3454 } 3455 } 3456 // If the RHS is a qualified interface pointer "NSString<P>*", 3457 // make sure we check the class hierarchy. 3458 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3459 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3460 E = lhsQID->qual_end(); I != E; ++I) { 3461 // when comparing an id<P> on lhs with a static type on rhs, 3462 // see if static class implements all of id's protocols, directly or 3463 // through its super class and categories. 3464 if (rhsID->ClassImplementsProtocol(*I, true)) { 3465 match = true; 3466 break; 3467 } 3468 } 3469 } 3470 if (!match) 3471 return false; 3472 } 3473 3474 return true; 3475 } 3476 3477 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3478 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3479 3480 if (const ObjCObjectPointerType *lhsOPT = 3481 lhs->getAsObjCInterfacePointerType()) { 3482 if (lhsOPT->qual_empty()) { 3483 bool match = false; 3484 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3485 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3486 E = rhsQID->qual_end(); I != E; ++I) { 3487 // when comparing an id<P> on lhs with a static type on rhs, 3488 // see if static class implements all of id's protocols, directly or 3489 // through its super class and categories. 3490 if (lhsID->ClassImplementsProtocol(*I, true)) { 3491 match = true; 3492 break; 3493 } 3494 } 3495 if (!match) 3496 return false; 3497 } 3498 return true; 3499 } 3500 // Both the right and left sides have qualifiers. 3501 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3502 E = lhsOPT->qual_end(); I != E; ++I) { 3503 ObjCProtocolDecl *lhsProto = *I; 3504 bool match = false; 3505 3506 // when comparing an id<P> on lhs with a static type on rhs, 3507 // see if static class implements all of id's protocols, directly or 3508 // through its super class and categories. 3509 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3510 E = rhsQID->qual_end(); J != E; ++J) { 3511 ObjCProtocolDecl *rhsProto = *J; 3512 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3513 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3514 match = true; 3515 break; 3516 } 3517 } 3518 if (!match) 3519 return false; 3520 } 3521 return true; 3522 } 3523 return false; 3524} 3525 3526/// canAssignObjCInterfaces - Return true if the two interface types are 3527/// compatible for assignment from RHS to LHS. This handles validation of any 3528/// protocol qualifiers on the LHS or RHS. 3529/// 3530bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3531 const ObjCObjectPointerType *RHSOPT) { 3532 // If either type represents the built-in 'id' or 'Class' types, return true. 3533 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3534 return true; 3535 3536 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3537 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3538 QualType(RHSOPT,0), 3539 false); 3540 3541 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3542 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3543 if (LHS && RHS) // We have 2 user-defined types. 3544 return canAssignObjCInterfaces(LHS, RHS); 3545 3546 return false; 3547} 3548 3549bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3550 const ObjCInterfaceType *RHS) { 3551 // Verify that the base decls are compatible: the RHS must be a subclass of 3552 // the LHS. 3553 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3554 return false; 3555 3556 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3557 // protocol qualified at all, then we are good. 3558 if (LHS->getNumProtocols() == 0) 3559 return true; 3560 3561 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3562 // isn't a superset. 3563 if (RHS->getNumProtocols() == 0) 3564 return true; // FIXME: should return false! 3565 3566 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3567 LHSPE = LHS->qual_end(); 3568 LHSPI != LHSPE; LHSPI++) { 3569 bool RHSImplementsProtocol = false; 3570 3571 // If the RHS doesn't implement the protocol on the left, the types 3572 // are incompatible. 3573 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3574 RHSPE = RHS->qual_end(); 3575 RHSPI != RHSPE; RHSPI++) { 3576 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3577 RHSImplementsProtocol = true; 3578 break; 3579 } 3580 } 3581 // FIXME: For better diagnostics, consider passing back the protocol name. 3582 if (!RHSImplementsProtocol) 3583 return false; 3584 } 3585 // The RHS implements all protocols listed on the LHS. 3586 return true; 3587} 3588 3589bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3590 // get the "pointed to" types 3591 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 3592 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 3593 3594 if (!LHSOPT || !RHSOPT) 3595 return false; 3596 3597 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3598 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3599} 3600 3601/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3602/// both shall have the identically qualified version of a compatible type. 3603/// C99 6.2.7p1: Two types have compatible types if their types are the 3604/// same. See 6.7.[2,3,5] for additional rules. 3605bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3606 return !mergeTypes(LHS, RHS).isNull(); 3607} 3608 3609QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3610 const FunctionType *lbase = lhs->getAs<FunctionType>(); 3611 const FunctionType *rbase = rhs->getAs<FunctionType>(); 3612 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3613 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3614 bool allLTypes = true; 3615 bool allRTypes = true; 3616 3617 // Check return type 3618 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3619 if (retType.isNull()) return QualType(); 3620 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3621 allLTypes = false; 3622 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3623 allRTypes = false; 3624 // FIXME: double check this 3625 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 3626 if (NoReturn != lbase->getNoReturnAttr()) 3627 allLTypes = false; 3628 if (NoReturn != rbase->getNoReturnAttr()) 3629 allRTypes = false; 3630 3631 if (lproto && rproto) { // two C99 style function prototypes 3632 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3633 "C++ shouldn't be here"); 3634 unsigned lproto_nargs = lproto->getNumArgs(); 3635 unsigned rproto_nargs = rproto->getNumArgs(); 3636 3637 // Compatible functions must have the same number of arguments 3638 if (lproto_nargs != rproto_nargs) 3639 return QualType(); 3640 3641 // Variadic and non-variadic functions aren't compatible 3642 if (lproto->isVariadic() != rproto->isVariadic()) 3643 return QualType(); 3644 3645 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3646 return QualType(); 3647 3648 // Check argument compatibility 3649 llvm::SmallVector<QualType, 10> types; 3650 for (unsigned i = 0; i < lproto_nargs; i++) { 3651 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3652 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3653 QualType argtype = mergeTypes(largtype, rargtype); 3654 if (argtype.isNull()) return QualType(); 3655 types.push_back(argtype); 3656 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3657 allLTypes = false; 3658 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3659 allRTypes = false; 3660 } 3661 if (allLTypes) return lhs; 3662 if (allRTypes) return rhs; 3663 return getFunctionType(retType, types.begin(), types.size(), 3664 lproto->isVariadic(), lproto->getTypeQuals(), 3665 NoReturn); 3666 } 3667 3668 if (lproto) allRTypes = false; 3669 if (rproto) allLTypes = false; 3670 3671 const FunctionProtoType *proto = lproto ? lproto : rproto; 3672 if (proto) { 3673 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3674 if (proto->isVariadic()) return QualType(); 3675 // Check that the types are compatible with the types that 3676 // would result from default argument promotions (C99 6.7.5.3p15). 3677 // The only types actually affected are promotable integer 3678 // types and floats, which would be passed as a different 3679 // type depending on whether the prototype is visible. 3680 unsigned proto_nargs = proto->getNumArgs(); 3681 for (unsigned i = 0; i < proto_nargs; ++i) { 3682 QualType argTy = proto->getArgType(i); 3683 if (argTy->isPromotableIntegerType() || 3684 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3685 return QualType(); 3686 } 3687 3688 if (allLTypes) return lhs; 3689 if (allRTypes) return rhs; 3690 return getFunctionType(retType, proto->arg_type_begin(), 3691 proto->getNumArgs(), proto->isVariadic(), 3692 proto->getTypeQuals(), NoReturn); 3693 } 3694 3695 if (allLTypes) return lhs; 3696 if (allRTypes) return rhs; 3697 return getFunctionNoProtoType(retType, NoReturn); 3698} 3699 3700QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3701 // C++ [expr]: If an expression initially has the type "reference to T", the 3702 // type is adjusted to "T" prior to any further analysis, the expression 3703 // designates the object or function denoted by the reference, and the 3704 // expression is an lvalue unless the reference is an rvalue reference and 3705 // the expression is a function call (possibly inside parentheses). 3706 // FIXME: C++ shouldn't be going through here! The rules are different 3707 // enough that they should be handled separately. 3708 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3709 // shouldn't be going through here! 3710 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 3711 LHS = RT->getPointeeType(); 3712 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 3713 RHS = RT->getPointeeType(); 3714 3715 QualType LHSCan = getCanonicalType(LHS), 3716 RHSCan = getCanonicalType(RHS); 3717 3718 // If two types are identical, they are compatible. 3719 if (LHSCan == RHSCan) 3720 return LHS; 3721 3722 // If the qualifiers are different, the types aren't compatible... mostly. 3723 Qualifiers LQuals = LHSCan.getQualifiers(); 3724 Qualifiers RQuals = RHSCan.getQualifiers(); 3725 if (LQuals != RQuals) { 3726 // If any of these qualifiers are different, we have a type 3727 // mismatch. 3728 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 3729 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 3730 return QualType(); 3731 3732 // Exactly one GC qualifier difference is allowed: __strong is 3733 // okay if the other type has no GC qualifier but is an Objective 3734 // C object pointer (i.e. implicitly strong by default). We fix 3735 // this by pretending that the unqualified type was actually 3736 // qualified __strong. 3737 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 3738 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 3739 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 3740 3741 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 3742 return QualType(); 3743 3744 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 3745 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 3746 } 3747 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 3748 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 3749 } 3750 return QualType(); 3751 } 3752 3753 // Okay, qualifiers are equal. 3754 3755 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3756 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3757 3758 // We want to consider the two function types to be the same for these 3759 // comparisons, just force one to the other. 3760 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3761 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3762 3763 // Same as above for arrays 3764 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3765 LHSClass = Type::ConstantArray; 3766 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3767 RHSClass = Type::ConstantArray; 3768 3769 // Canonicalize ExtVector -> Vector. 3770 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3771 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3772 3773 // If the canonical type classes don't match. 3774 if (LHSClass != RHSClass) { 3775 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3776 // a signed integer type, or an unsigned integer type. 3777 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 3778 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3779 return RHS; 3780 } 3781 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 3782 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3783 return LHS; 3784 } 3785 3786 return QualType(); 3787 } 3788 3789 // The canonical type classes match. 3790 switch (LHSClass) { 3791#define TYPE(Class, Base) 3792#define ABSTRACT_TYPE(Class, Base) 3793#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3794#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3795#include "clang/AST/TypeNodes.def" 3796 assert(false && "Non-canonical and dependent types shouldn't get here"); 3797 return QualType(); 3798 3799 case Type::LValueReference: 3800 case Type::RValueReference: 3801 case Type::MemberPointer: 3802 assert(false && "C++ should never be in mergeTypes"); 3803 return QualType(); 3804 3805 case Type::IncompleteArray: 3806 case Type::VariableArray: 3807 case Type::FunctionProto: 3808 case Type::ExtVector: 3809 assert(false && "Types are eliminated above"); 3810 return QualType(); 3811 3812 case Type::Pointer: 3813 { 3814 // Merge two pointer types, while trying to preserve typedef info 3815 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 3816 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 3817 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3818 if (ResultType.isNull()) return QualType(); 3819 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3820 return LHS; 3821 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3822 return RHS; 3823 return getPointerType(ResultType); 3824 } 3825 case Type::BlockPointer: 3826 { 3827 // Merge two block pointer types, while trying to preserve typedef info 3828 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 3829 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 3830 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3831 if (ResultType.isNull()) return QualType(); 3832 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3833 return LHS; 3834 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3835 return RHS; 3836 return getBlockPointerType(ResultType); 3837 } 3838 case Type::ConstantArray: 3839 { 3840 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3841 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3842 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3843 return QualType(); 3844 3845 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3846 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3847 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3848 if (ResultType.isNull()) return QualType(); 3849 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3850 return LHS; 3851 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3852 return RHS; 3853 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3854 ArrayType::ArraySizeModifier(), 0); 3855 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3856 ArrayType::ArraySizeModifier(), 0); 3857 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3858 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3859 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3860 return LHS; 3861 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3862 return RHS; 3863 if (LVAT) { 3864 // FIXME: This isn't correct! But tricky to implement because 3865 // the array's size has to be the size of LHS, but the type 3866 // has to be different. 3867 return LHS; 3868 } 3869 if (RVAT) { 3870 // FIXME: This isn't correct! But tricky to implement because 3871 // the array's size has to be the size of RHS, but the type 3872 // has to be different. 3873 return RHS; 3874 } 3875 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3876 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3877 return getIncompleteArrayType(ResultType, 3878 ArrayType::ArraySizeModifier(), 0); 3879 } 3880 case Type::FunctionNoProto: 3881 return mergeFunctionTypes(LHS, RHS); 3882 case Type::Record: 3883 case Type::Enum: 3884 return QualType(); 3885 case Type::Builtin: 3886 // Only exactly equal builtin types are compatible, which is tested above. 3887 return QualType(); 3888 case Type::Complex: 3889 // Distinct complex types are incompatible. 3890 return QualType(); 3891 case Type::Vector: 3892 // FIXME: The merged type should be an ExtVector! 3893 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 3894 return LHS; 3895 return QualType(); 3896 case Type::ObjCInterface: { 3897 // Check if the interfaces are assignment compatible. 3898 // FIXME: This should be type compatibility, e.g. whether 3899 // "LHS x; RHS x;" at global scope is legal. 3900 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 3901 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 3902 if (LHSIface && RHSIface && 3903 canAssignObjCInterfaces(LHSIface, RHSIface)) 3904 return LHS; 3905 3906 return QualType(); 3907 } 3908 case Type::ObjCObjectPointer: { 3909 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 3910 RHS->getAs<ObjCObjectPointerType>())) 3911 return LHS; 3912 3913 return QualType(); 3914 } 3915 case Type::FixedWidthInt: 3916 // Distinct fixed-width integers are not compatible. 3917 return QualType(); 3918 case Type::TemplateSpecialization: 3919 assert(false && "Dependent types have no size"); 3920 break; 3921 } 3922 3923 return QualType(); 3924} 3925 3926//===----------------------------------------------------------------------===// 3927// Integer Predicates 3928//===----------------------------------------------------------------------===// 3929 3930unsigned ASTContext::getIntWidth(QualType T) { 3931 if (T == BoolTy) 3932 return 1; 3933 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3934 return FWIT->getWidth(); 3935 } 3936 // For builtin types, just use the standard type sizing method 3937 return (unsigned)getTypeSize(T); 3938} 3939 3940QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3941 assert(T->isSignedIntegerType() && "Unexpected type"); 3942 if (const EnumType* ETy = T->getAs<EnumType>()) 3943 T = ETy->getDecl()->getIntegerType(); 3944 const BuiltinType* BTy = T->getAs<BuiltinType>(); 3945 assert (BTy && "Unexpected signed integer type"); 3946 switch (BTy->getKind()) { 3947 case BuiltinType::Char_S: 3948 case BuiltinType::SChar: 3949 return UnsignedCharTy; 3950 case BuiltinType::Short: 3951 return UnsignedShortTy; 3952 case BuiltinType::Int: 3953 return UnsignedIntTy; 3954 case BuiltinType::Long: 3955 return UnsignedLongTy; 3956 case BuiltinType::LongLong: 3957 return UnsignedLongLongTy; 3958 case BuiltinType::Int128: 3959 return UnsignedInt128Ty; 3960 default: 3961 assert(0 && "Unexpected signed integer type"); 3962 return QualType(); 3963 } 3964} 3965 3966ExternalASTSource::~ExternalASTSource() { } 3967 3968void ExternalASTSource::PrintStats() { } 3969 3970 3971//===----------------------------------------------------------------------===// 3972// Builtin Type Computation 3973//===----------------------------------------------------------------------===// 3974 3975/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3976/// pointer over the consumed characters. This returns the resultant type. 3977static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3978 ASTContext::GetBuiltinTypeError &Error, 3979 bool AllowTypeModifiers = true) { 3980 // Modifiers. 3981 int HowLong = 0; 3982 bool Signed = false, Unsigned = false; 3983 3984 // Read the modifiers first. 3985 bool Done = false; 3986 while (!Done) { 3987 switch (*Str++) { 3988 default: Done = true; --Str; break; 3989 case 'S': 3990 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3991 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3992 Signed = true; 3993 break; 3994 case 'U': 3995 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 3996 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 3997 Unsigned = true; 3998 break; 3999 case 'L': 4000 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4001 ++HowLong; 4002 break; 4003 } 4004 } 4005 4006 QualType Type; 4007 4008 // Read the base type. 4009 switch (*Str++) { 4010 default: assert(0 && "Unknown builtin type letter!"); 4011 case 'v': 4012 assert(HowLong == 0 && !Signed && !Unsigned && 4013 "Bad modifiers used with 'v'!"); 4014 Type = Context.VoidTy; 4015 break; 4016 case 'f': 4017 assert(HowLong == 0 && !Signed && !Unsigned && 4018 "Bad modifiers used with 'f'!"); 4019 Type = Context.FloatTy; 4020 break; 4021 case 'd': 4022 assert(HowLong < 2 && !Signed && !Unsigned && 4023 "Bad modifiers used with 'd'!"); 4024 if (HowLong) 4025 Type = Context.LongDoubleTy; 4026 else 4027 Type = Context.DoubleTy; 4028 break; 4029 case 's': 4030 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4031 if (Unsigned) 4032 Type = Context.UnsignedShortTy; 4033 else 4034 Type = Context.ShortTy; 4035 break; 4036 case 'i': 4037 if (HowLong == 3) 4038 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4039 else if (HowLong == 2) 4040 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4041 else if (HowLong == 1) 4042 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4043 else 4044 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4045 break; 4046 case 'c': 4047 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4048 if (Signed) 4049 Type = Context.SignedCharTy; 4050 else if (Unsigned) 4051 Type = Context.UnsignedCharTy; 4052 else 4053 Type = Context.CharTy; 4054 break; 4055 case 'b': // boolean 4056 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4057 Type = Context.BoolTy; 4058 break; 4059 case 'z': // size_t. 4060 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4061 Type = Context.getSizeType(); 4062 break; 4063 case 'F': 4064 Type = Context.getCFConstantStringType(); 4065 break; 4066 case 'a': 4067 Type = Context.getBuiltinVaListType(); 4068 assert(!Type.isNull() && "builtin va list type not initialized!"); 4069 break; 4070 case 'A': 4071 // This is a "reference" to a va_list; however, what exactly 4072 // this means depends on how va_list is defined. There are two 4073 // different kinds of va_list: ones passed by value, and ones 4074 // passed by reference. An example of a by-value va_list is 4075 // x86, where va_list is a char*. An example of by-ref va_list 4076 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4077 // we want this argument to be a char*&; for x86-64, we want 4078 // it to be a __va_list_tag*. 4079 Type = Context.getBuiltinVaListType(); 4080 assert(!Type.isNull() && "builtin va list type not initialized!"); 4081 if (Type->isArrayType()) { 4082 Type = Context.getArrayDecayedType(Type); 4083 } else { 4084 Type = Context.getLValueReferenceType(Type); 4085 } 4086 break; 4087 case 'V': { 4088 char *End; 4089 unsigned NumElements = strtoul(Str, &End, 10); 4090 assert(End != Str && "Missing vector size"); 4091 4092 Str = End; 4093 4094 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4095 Type = Context.getVectorType(ElementType, NumElements); 4096 break; 4097 } 4098 case 'X': { 4099 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4100 Type = Context.getComplexType(ElementType); 4101 break; 4102 } 4103 case 'P': 4104 Type = Context.getFILEType(); 4105 if (Type.isNull()) { 4106 Error = ASTContext::GE_Missing_stdio; 4107 return QualType(); 4108 } 4109 break; 4110 case 'J': 4111 if (Signed) 4112 Type = Context.getsigjmp_bufType(); 4113 else 4114 Type = Context.getjmp_bufType(); 4115 4116 if (Type.isNull()) { 4117 Error = ASTContext::GE_Missing_setjmp; 4118 return QualType(); 4119 } 4120 break; 4121 } 4122 4123 if (!AllowTypeModifiers) 4124 return Type; 4125 4126 Done = false; 4127 while (!Done) { 4128 switch (*Str++) { 4129 default: Done = true; --Str; break; 4130 case '*': 4131 Type = Context.getPointerType(Type); 4132 break; 4133 case '&': 4134 Type = Context.getLValueReferenceType(Type); 4135 break; 4136 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4137 case 'C': 4138 Type = Type.withConst(); 4139 break; 4140 } 4141 } 4142 4143 return Type; 4144} 4145 4146/// GetBuiltinType - Return the type for the specified builtin. 4147QualType ASTContext::GetBuiltinType(unsigned id, 4148 GetBuiltinTypeError &Error) { 4149 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4150 4151 llvm::SmallVector<QualType, 8> ArgTypes; 4152 4153 Error = GE_None; 4154 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4155 if (Error != GE_None) 4156 return QualType(); 4157 while (TypeStr[0] && TypeStr[0] != '.') { 4158 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4159 if (Error != GE_None) 4160 return QualType(); 4161 4162 // Do array -> pointer decay. The builtin should use the decayed type. 4163 if (Ty->isArrayType()) 4164 Ty = getArrayDecayedType(Ty); 4165 4166 ArgTypes.push_back(Ty); 4167 } 4168 4169 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4170 "'.' should only occur at end of builtin type list!"); 4171 4172 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4173 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4174 return getFunctionNoProtoType(ResType); 4175 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4176 TypeStr[0] == '.', 0); 4177} 4178 4179QualType 4180ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4181 // Perform the usual unary conversions. We do this early so that 4182 // integral promotions to "int" can allow us to exit early, in the 4183 // lhs == rhs check. Also, for conversion purposes, we ignore any 4184 // qualifiers. For example, "const float" and "float" are 4185 // equivalent. 4186 if (lhs->isPromotableIntegerType()) 4187 lhs = getPromotedIntegerType(lhs); 4188 else 4189 lhs = lhs.getUnqualifiedType(); 4190 if (rhs->isPromotableIntegerType()) 4191 rhs = getPromotedIntegerType(rhs); 4192 else 4193 rhs = rhs.getUnqualifiedType(); 4194 4195 // If both types are identical, no conversion is needed. 4196 if (lhs == rhs) 4197 return lhs; 4198 4199 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4200 // The caller can deal with this (e.g. pointer + int). 4201 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4202 return lhs; 4203 4204 // At this point, we have two different arithmetic types. 4205 4206 // Handle complex types first (C99 6.3.1.8p1). 4207 if (lhs->isComplexType() || rhs->isComplexType()) { 4208 // if we have an integer operand, the result is the complex type. 4209 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4210 // convert the rhs to the lhs complex type. 4211 return lhs; 4212 } 4213 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4214 // convert the lhs to the rhs complex type. 4215 return rhs; 4216 } 4217 // This handles complex/complex, complex/float, or float/complex. 4218 // When both operands are complex, the shorter operand is converted to the 4219 // type of the longer, and that is the type of the result. This corresponds 4220 // to what is done when combining two real floating-point operands. 4221 // The fun begins when size promotion occur across type domains. 4222 // From H&S 6.3.4: When one operand is complex and the other is a real 4223 // floating-point type, the less precise type is converted, within it's 4224 // real or complex domain, to the precision of the other type. For example, 4225 // when combining a "long double" with a "double _Complex", the 4226 // "double _Complex" is promoted to "long double _Complex". 4227 int result = getFloatingTypeOrder(lhs, rhs); 4228 4229 if (result > 0) { // The left side is bigger, convert rhs. 4230 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4231 } else if (result < 0) { // The right side is bigger, convert lhs. 4232 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4233 } 4234 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4235 // domains match. This is a requirement for our implementation, C99 4236 // does not require this promotion. 4237 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4238 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4239 return rhs; 4240 } else { // handle "_Complex double, double". 4241 return lhs; 4242 } 4243 } 4244 return lhs; // The domain/size match exactly. 4245 } 4246 // Now handle "real" floating types (i.e. float, double, long double). 4247 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4248 // if we have an integer operand, the result is the real floating type. 4249 if (rhs->isIntegerType()) { 4250 // convert rhs to the lhs floating point type. 4251 return lhs; 4252 } 4253 if (rhs->isComplexIntegerType()) { 4254 // convert rhs to the complex floating point type. 4255 return getComplexType(lhs); 4256 } 4257 if (lhs->isIntegerType()) { 4258 // convert lhs to the rhs floating point type. 4259 return rhs; 4260 } 4261 if (lhs->isComplexIntegerType()) { 4262 // convert lhs to the complex floating point type. 4263 return getComplexType(rhs); 4264 } 4265 // We have two real floating types, float/complex combos were handled above. 4266 // Convert the smaller operand to the bigger result. 4267 int result = getFloatingTypeOrder(lhs, rhs); 4268 if (result > 0) // convert the rhs 4269 return lhs; 4270 assert(result < 0 && "illegal float comparison"); 4271 return rhs; // convert the lhs 4272 } 4273 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4274 // Handle GCC complex int extension. 4275 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4276 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4277 4278 if (lhsComplexInt && rhsComplexInt) { 4279 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4280 rhsComplexInt->getElementType()) >= 0) 4281 return lhs; // convert the rhs 4282 return rhs; 4283 } else if (lhsComplexInt && rhs->isIntegerType()) { 4284 // convert the rhs to the lhs complex type. 4285 return lhs; 4286 } else if (rhsComplexInt && lhs->isIntegerType()) { 4287 // convert the lhs to the rhs complex type. 4288 return rhs; 4289 } 4290 } 4291 // Finally, we have two differing integer types. 4292 // The rules for this case are in C99 6.3.1.8 4293 int compare = getIntegerTypeOrder(lhs, rhs); 4294 bool lhsSigned = lhs->isSignedIntegerType(), 4295 rhsSigned = rhs->isSignedIntegerType(); 4296 QualType destType; 4297 if (lhsSigned == rhsSigned) { 4298 // Same signedness; use the higher-ranked type 4299 destType = compare >= 0 ? lhs : rhs; 4300 } else if (compare != (lhsSigned ? 1 : -1)) { 4301 // The unsigned type has greater than or equal rank to the 4302 // signed type, so use the unsigned type 4303 destType = lhsSigned ? rhs : lhs; 4304 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4305 // The two types are different widths; if we are here, that 4306 // means the signed type is larger than the unsigned type, so 4307 // use the signed type. 4308 destType = lhsSigned ? lhs : rhs; 4309 } else { 4310 // The signed type is higher-ranked than the unsigned type, 4311 // but isn't actually any bigger (like unsigned int and long 4312 // on most 32-bit systems). Use the unsigned type corresponding 4313 // to the signed type. 4314 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4315 } 4316 return destType; 4317} 4318