ASTContext.cpp revision 663b5a0be7261c29bc4c526a71cffcfa02d4153e
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::ConstantArrayWithExpr: 575 case Type::ConstantArrayWithoutExpr: 576 case Type::ConstantArray: { 577 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 578 579 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 580 Width = EltInfo.first*CAT->getSize().getZExtValue(); 581 Align = EltInfo.second; 582 break; 583 } 584 case Type::ExtVector: 585 case Type::Vector: { 586 std::pair<uint64_t, unsigned> EltInfo = 587 getTypeInfo(cast<VectorType>(T)->getElementType()); 588 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 589 Align = Width; 590 // If the alignment is not a power of 2, round up to the next power of 2. 591 // This happens for non-power-of-2 length vectors. 592 // FIXME: this should probably be a target property. 593 Align = 1 << llvm::Log2_32_Ceil(Align); 594 break; 595 } 596 597 case Type::Builtin: 598 switch (cast<BuiltinType>(T)->getKind()) { 599 default: assert(0 && "Unknown builtin type!"); 600 case BuiltinType::Void: 601 // GCC extension: alignof(void) = 8 bits. 602 Width = 0; 603 Align = 8; 604 break; 605 606 case BuiltinType::Bool: 607 Width = Target.getBoolWidth(); 608 Align = Target.getBoolAlign(); 609 break; 610 case BuiltinType::Char_S: 611 case BuiltinType::Char_U: 612 case BuiltinType::UChar: 613 case BuiltinType::SChar: 614 Width = Target.getCharWidth(); 615 Align = Target.getCharAlign(); 616 break; 617 case BuiltinType::WChar: 618 Width = Target.getWCharWidth(); 619 Align = Target.getWCharAlign(); 620 break; 621 case BuiltinType::Char16: 622 Width = Target.getChar16Width(); 623 Align = Target.getChar16Align(); 624 break; 625 case BuiltinType::Char32: 626 Width = Target.getChar32Width(); 627 Align = Target.getChar32Align(); 628 break; 629 case BuiltinType::UShort: 630 case BuiltinType::Short: 631 Width = Target.getShortWidth(); 632 Align = Target.getShortAlign(); 633 break; 634 case BuiltinType::UInt: 635 case BuiltinType::Int: 636 Width = Target.getIntWidth(); 637 Align = Target.getIntAlign(); 638 break; 639 case BuiltinType::ULong: 640 case BuiltinType::Long: 641 Width = Target.getLongWidth(); 642 Align = Target.getLongAlign(); 643 break; 644 case BuiltinType::ULongLong: 645 case BuiltinType::LongLong: 646 Width = Target.getLongLongWidth(); 647 Align = Target.getLongLongAlign(); 648 break; 649 case BuiltinType::Int128: 650 case BuiltinType::UInt128: 651 Width = 128; 652 Align = 128; // int128_t is 128-bit aligned on all targets. 653 break; 654 case BuiltinType::Float: 655 Width = Target.getFloatWidth(); 656 Align = Target.getFloatAlign(); 657 break; 658 case BuiltinType::Double: 659 Width = Target.getDoubleWidth(); 660 Align = Target.getDoubleAlign(); 661 break; 662 case BuiltinType::LongDouble: 663 Width = Target.getLongDoubleWidth(); 664 Align = Target.getLongDoubleAlign(); 665 break; 666 case BuiltinType::NullPtr: 667 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 668 Align = Target.getPointerAlign(0); // == sizeof(void*) 669 break; 670 } 671 break; 672 case Type::FixedWidthInt: 673 // FIXME: This isn't precisely correct; the width/alignment should depend 674 // on the available types for the target 675 Width = cast<FixedWidthIntType>(T)->getWidth(); 676 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 677 Align = Width; 678 break; 679 case Type::ObjCObjectPointer: 680 Width = Target.getPointerWidth(0); 681 Align = Target.getPointerAlign(0); 682 break; 683 case Type::BlockPointer: { 684 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 685 Width = Target.getPointerWidth(AS); 686 Align = Target.getPointerAlign(AS); 687 break; 688 } 689 case Type::Pointer: { 690 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 691 Width = Target.getPointerWidth(AS); 692 Align = Target.getPointerAlign(AS); 693 break; 694 } 695 case Type::LValueReference: 696 case Type::RValueReference: 697 // "When applied to a reference or a reference type, the result is the size 698 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 699 // FIXME: This is wrong for struct layout: a reference in a struct has 700 // pointer size. 701 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 702 case Type::MemberPointer: { 703 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 704 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 705 // If we ever want to support other ABIs this needs to be abstracted. 706 707 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 708 std::pair<uint64_t, unsigned> PtrDiffInfo = 709 getTypeInfo(getPointerDiffType()); 710 Width = PtrDiffInfo.first; 711 if (Pointee->isFunctionType()) 712 Width *= 2; 713 Align = PtrDiffInfo.second; 714 break; 715 } 716 case Type::Complex: { 717 // Complex types have the same alignment as their elements, but twice the 718 // size. 719 std::pair<uint64_t, unsigned> EltInfo = 720 getTypeInfo(cast<ComplexType>(T)->getElementType()); 721 Width = EltInfo.first*2; 722 Align = EltInfo.second; 723 break; 724 } 725 case Type::ObjCInterface: { 726 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 727 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 728 Width = Layout.getSize(); 729 Align = Layout.getAlignment(); 730 break; 731 } 732 case Type::Record: 733 case Type::Enum: { 734 const TagType *TT = cast<TagType>(T); 735 736 if (TT->getDecl()->isInvalidDecl()) { 737 Width = 1; 738 Align = 1; 739 break; 740 } 741 742 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 743 return getTypeInfo(ET->getDecl()->getIntegerType()); 744 745 const RecordType *RT = cast<RecordType>(TT); 746 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 747 Width = Layout.getSize(); 748 Align = Layout.getAlignment(); 749 break; 750 } 751 752 case Type::Elaborated: { 753 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType().getTypePtr()); 754 } 755 756 case Type::Typedef: { 757 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 758 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 759 Align = Aligned->getAlignment(); 760 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 761 } else 762 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 763 break; 764 } 765 766 case Type::TypeOfExpr: 767 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 768 .getTypePtr()); 769 770 case Type::TypeOf: 771 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 772 773 case Type::Decltype: 774 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 775 .getTypePtr()); 776 777 case Type::QualifiedName: 778 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 779 780 case Type::TemplateSpecialization: 781 assert(getCanonicalType(T) != T && 782 "Cannot request the size of a dependent type"); 783 // FIXME: this is likely to be wrong once we support template 784 // aliases, since a template alias could refer to a typedef that 785 // has an __aligned__ attribute on it. 786 return getTypeInfo(getCanonicalType(T)); 787 } 788 789 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 790 return std::make_pair(Width, Align); 791} 792 793/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 794/// type for the current target in bits. This can be different than the ABI 795/// alignment in cases where it is beneficial for performance to overalign 796/// a data type. 797unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 798 unsigned ABIAlign = getTypeAlign(T); 799 800 // Double and long long should be naturally aligned if possible. 801 if (const ComplexType* CT = T->getAs<ComplexType>()) 802 T = CT->getElementType().getTypePtr(); 803 if (T->isSpecificBuiltinType(BuiltinType::Double) || 804 T->isSpecificBuiltinType(BuiltinType::LongLong)) 805 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 806 807 return ABIAlign; 808} 809 810static void CollectLocalObjCIvars(ASTContext *Ctx, 811 const ObjCInterfaceDecl *OI, 812 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 813 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 814 E = OI->ivar_end(); I != E; ++I) { 815 ObjCIvarDecl *IVDecl = *I; 816 if (!IVDecl->isInvalidDecl()) 817 Fields.push_back(cast<FieldDecl>(IVDecl)); 818 } 819} 820 821void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 822 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 823 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 824 CollectObjCIvars(SuperClass, Fields); 825 CollectLocalObjCIvars(this, OI, Fields); 826} 827 828/// ShallowCollectObjCIvars - 829/// Collect all ivars, including those synthesized, in the current class. 830/// 831void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 832 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 833 bool CollectSynthesized) { 834 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 835 E = OI->ivar_end(); I != E; ++I) { 836 Ivars.push_back(*I); 837 } 838 if (CollectSynthesized) 839 CollectSynthesizedIvars(OI, Ivars); 840} 841 842void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 843 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 844 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 845 E = PD->prop_end(); I != E; ++I) 846 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 847 Ivars.push_back(Ivar); 848 849 // Also look into nested protocols. 850 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 851 E = PD->protocol_end(); P != E; ++P) 852 CollectProtocolSynthesizedIvars(*P, Ivars); 853} 854 855/// CollectSynthesizedIvars - 856/// This routine collect synthesized ivars for the designated class. 857/// 858void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 859 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 860 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 861 E = OI->prop_end(); I != E; ++I) { 862 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 863 Ivars.push_back(Ivar); 864 } 865 // Also look into interface's protocol list for properties declared 866 // in the protocol and whose ivars are synthesized. 867 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 868 PE = OI->protocol_end(); P != PE; ++P) { 869 ObjCProtocolDecl *PD = (*P); 870 CollectProtocolSynthesizedIvars(PD, Ivars); 871 } 872} 873 874unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 875 unsigned count = 0; 876 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 877 E = PD->prop_end(); I != E; ++I) 878 if ((*I)->getPropertyIvarDecl()) 879 ++count; 880 881 // Also look into nested protocols. 882 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 883 E = PD->protocol_end(); P != E; ++P) 884 count += CountProtocolSynthesizedIvars(*P); 885 return count; 886} 887 888unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) { 889 unsigned count = 0; 890 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 891 E = OI->prop_end(); I != E; ++I) { 892 if ((*I)->getPropertyIvarDecl()) 893 ++count; 894 } 895 // Also look into interface's protocol list for properties declared 896 // in the protocol and whose ivars are synthesized. 897 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 898 PE = OI->protocol_end(); P != PE; ++P) { 899 ObjCProtocolDecl *PD = (*P); 900 count += CountProtocolSynthesizedIvars(PD); 901 } 902 return count; 903} 904 905/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 906ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 907 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 908 I = ObjCImpls.find(D); 909 if (I != ObjCImpls.end()) 910 return cast<ObjCImplementationDecl>(I->second); 911 return 0; 912} 913/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 914ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 915 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 916 I = ObjCImpls.find(D); 917 if (I != ObjCImpls.end()) 918 return cast<ObjCCategoryImplDecl>(I->second); 919 return 0; 920} 921 922/// \brief Set the implementation of ObjCInterfaceDecl. 923void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 924 ObjCImplementationDecl *ImplD) { 925 assert(IFaceD && ImplD && "Passed null params"); 926 ObjCImpls[IFaceD] = ImplD; 927} 928/// \brief Set the implementation of ObjCCategoryDecl. 929void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 930 ObjCCategoryImplDecl *ImplD) { 931 assert(CatD && ImplD && "Passed null params"); 932 ObjCImpls[CatD] = ImplD; 933} 934 935/// \brief Allocate an uninitialized DeclaratorInfo. 936/// 937/// The caller should initialize the memory held by DeclaratorInfo using 938/// the TypeLoc wrappers. 939/// 940/// \param T the type that will be the basis for type source info. This type 941/// should refer to how the declarator was written in source code, not to 942/// what type semantic analysis resolved the declarator to. 943DeclaratorInfo *ASTContext::CreateDeclaratorInfo(QualType T) { 944 unsigned DataSize = TypeLoc::getFullDataSizeForType(T); 945 DeclaratorInfo *DInfo = 946 (DeclaratorInfo*)BumpAlloc.Allocate(sizeof(DeclaratorInfo) + DataSize, 8); 947 new (DInfo) DeclaratorInfo(T); 948 return DInfo; 949} 950 951/// getInterfaceLayoutImpl - Get or compute information about the 952/// layout of the given interface. 953/// 954/// \param Impl - If given, also include the layout of the interface's 955/// implementation. This may differ by including synthesized ivars. 956const ASTRecordLayout & 957ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 958 const ObjCImplementationDecl *Impl) { 959 assert(!D->isForwardDecl() && "Invalid interface decl!"); 960 961 // Look up this layout, if already laid out, return what we have. 962 ObjCContainerDecl *Key = 963 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 964 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 965 return *Entry; 966 967 // Add in synthesized ivar count if laying out an implementation. 968 if (Impl) { 969 unsigned FieldCount = D->ivar_size(); 970 unsigned SynthCount = CountSynthesizedIvars(D); 971 FieldCount += SynthCount; 972 // If there aren't any sythesized ivars then reuse the interface 973 // entry. Note we can't cache this because we simply free all 974 // entries later; however we shouldn't look up implementations 975 // frequently. 976 if (SynthCount == 0) 977 return getObjCLayout(D, 0); 978 } 979 980 const ASTRecordLayout *NewEntry = 981 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 982 ObjCLayouts[Key] = NewEntry; 983 984 return *NewEntry; 985} 986 987const ASTRecordLayout & 988ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 989 return getObjCLayout(D, 0); 990} 991 992const ASTRecordLayout & 993ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 994 return getObjCLayout(D->getClassInterface(), D); 995} 996 997/// getASTRecordLayout - Get or compute information about the layout of the 998/// specified record (struct/union/class), which indicates its size and field 999/// position information. 1000const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 1001 D = D->getDefinition(*this); 1002 assert(D && "Cannot get layout of forward declarations!"); 1003 1004 // Look up this layout, if already laid out, return what we have. 1005 // Note that we can't save a reference to the entry because this function 1006 // is recursive. 1007 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 1008 if (Entry) return *Entry; 1009 1010 const ASTRecordLayout *NewEntry = 1011 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 1012 ASTRecordLayouts[D] = NewEntry; 1013 1014 return *NewEntry; 1015} 1016 1017//===----------------------------------------------------------------------===// 1018// Type creation/memoization methods 1019//===----------------------------------------------------------------------===// 1020 1021QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1022 unsigned Fast = Quals.getFastQualifiers(); 1023 Quals.removeFastQualifiers(); 1024 1025 // Check if we've already instantiated this type. 1026 llvm::FoldingSetNodeID ID; 1027 ExtQuals::Profile(ID, TypeNode, Quals); 1028 void *InsertPos = 0; 1029 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1030 assert(EQ->getQualifiers() == Quals); 1031 QualType T = QualType(EQ, Fast); 1032 return T; 1033 } 1034 1035 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1036 ExtQualNodes.InsertNode(New, InsertPos); 1037 QualType T = QualType(New, Fast); 1038 return T; 1039} 1040 1041QualType ASTContext::getVolatileType(QualType T) { 1042 QualType CanT = getCanonicalType(T); 1043 if (CanT.isVolatileQualified()) return T; 1044 1045 QualifierCollector Quals; 1046 const Type *TypeNode = Quals.strip(T); 1047 Quals.addVolatile(); 1048 1049 return getExtQualType(TypeNode, Quals); 1050} 1051 1052QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1053 QualType CanT = getCanonicalType(T); 1054 if (CanT.getAddressSpace() == AddressSpace) 1055 return T; 1056 1057 // If we are composing extended qualifiers together, merge together 1058 // into one ExtQuals node. 1059 QualifierCollector Quals; 1060 const Type *TypeNode = Quals.strip(T); 1061 1062 // If this type already has an address space specified, it cannot get 1063 // another one. 1064 assert(!Quals.hasAddressSpace() && 1065 "Type cannot be in multiple addr spaces!"); 1066 Quals.addAddressSpace(AddressSpace); 1067 1068 return getExtQualType(TypeNode, Quals); 1069} 1070 1071QualType ASTContext::getObjCGCQualType(QualType T, 1072 Qualifiers::GC GCAttr) { 1073 QualType CanT = getCanonicalType(T); 1074 if (CanT.getObjCGCAttr() == GCAttr) 1075 return T; 1076 1077 if (T->isPointerType()) { 1078 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1079 if (Pointee->isAnyPointerType()) { 1080 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1081 return getPointerType(ResultType); 1082 } 1083 } 1084 1085 // If we are composing extended qualifiers together, merge together 1086 // into one ExtQuals node. 1087 QualifierCollector Quals; 1088 const Type *TypeNode = Quals.strip(T); 1089 1090 // If this type already has an ObjCGC specified, it cannot get 1091 // another one. 1092 assert(!Quals.hasObjCGCAttr() && 1093 "Type cannot have multiple ObjCGCs!"); 1094 Quals.addObjCGCAttr(GCAttr); 1095 1096 return getExtQualType(TypeNode, Quals); 1097} 1098 1099QualType ASTContext::getNoReturnType(QualType T) { 1100 QualType ResultType; 1101 if (T->isPointerType()) { 1102 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1103 ResultType = getNoReturnType(Pointee); 1104 ResultType = getPointerType(ResultType); 1105 } else if (T->isBlockPointerType()) { 1106 QualType Pointee = T->getAs<BlockPointerType>()->getPointeeType(); 1107 ResultType = getNoReturnType(Pointee); 1108 ResultType = getBlockPointerType(ResultType); 1109 } else { 1110 assert (T->isFunctionType() 1111 && "can't noreturn qualify non-pointer to function or block type"); 1112 1113 if (const FunctionNoProtoType *FNPT = T->getAs<FunctionNoProtoType>()) { 1114 ResultType = getFunctionNoProtoType(FNPT->getResultType(), true); 1115 } else { 1116 const FunctionProtoType *F = T->getAs<FunctionProtoType>(); 1117 ResultType 1118 = getFunctionType(F->getResultType(), F->arg_type_begin(), 1119 F->getNumArgs(), F->isVariadic(), F->getTypeQuals(), 1120 F->hasExceptionSpec(), F->hasAnyExceptionSpec(), 1121 F->getNumExceptions(), F->exception_begin(), true); 1122 } 1123 } 1124 1125 return getQualifiedType(ResultType, T.getQualifiers()); 1126} 1127 1128/// getComplexType - Return the uniqued reference to the type for a complex 1129/// number with the specified element type. 1130QualType ASTContext::getComplexType(QualType T) { 1131 // Unique pointers, to guarantee there is only one pointer of a particular 1132 // structure. 1133 llvm::FoldingSetNodeID ID; 1134 ComplexType::Profile(ID, T); 1135 1136 void *InsertPos = 0; 1137 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1138 return QualType(CT, 0); 1139 1140 // If the pointee type isn't canonical, this won't be a canonical type either, 1141 // so fill in the canonical type field. 1142 QualType Canonical; 1143 if (!T->isCanonical()) { 1144 Canonical = getComplexType(getCanonicalType(T)); 1145 1146 // Get the new insert position for the node we care about. 1147 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1148 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1149 } 1150 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1151 Types.push_back(New); 1152 ComplexTypes.InsertNode(New, InsertPos); 1153 return QualType(New, 0); 1154} 1155 1156QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1157 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1158 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1159 FixedWidthIntType *&Entry = Map[Width]; 1160 if (!Entry) 1161 Entry = new FixedWidthIntType(Width, Signed); 1162 return QualType(Entry, 0); 1163} 1164 1165/// getPointerType - Return the uniqued reference to the type for a pointer to 1166/// the specified type. 1167QualType ASTContext::getPointerType(QualType T) { 1168 // Unique pointers, to guarantee there is only one pointer of a particular 1169 // structure. 1170 llvm::FoldingSetNodeID ID; 1171 PointerType::Profile(ID, T); 1172 1173 void *InsertPos = 0; 1174 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1175 return QualType(PT, 0); 1176 1177 // If the pointee type isn't canonical, this won't be a canonical type either, 1178 // so fill in the canonical type field. 1179 QualType Canonical; 1180 if (!T->isCanonical()) { 1181 Canonical = getPointerType(getCanonicalType(T)); 1182 1183 // Get the new insert position for the node we care about. 1184 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1185 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1186 } 1187 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1188 Types.push_back(New); 1189 PointerTypes.InsertNode(New, InsertPos); 1190 return QualType(New, 0); 1191} 1192 1193/// getBlockPointerType - Return the uniqued reference to the type for 1194/// a pointer to the specified block. 1195QualType ASTContext::getBlockPointerType(QualType T) { 1196 assert(T->isFunctionType() && "block of function types only"); 1197 // Unique pointers, to guarantee there is only one block of a particular 1198 // structure. 1199 llvm::FoldingSetNodeID ID; 1200 BlockPointerType::Profile(ID, T); 1201 1202 void *InsertPos = 0; 1203 if (BlockPointerType *PT = 1204 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1205 return QualType(PT, 0); 1206 1207 // If the block pointee type isn't canonical, this won't be a canonical 1208 // type either so fill in the canonical type field. 1209 QualType Canonical; 1210 if (!T->isCanonical()) { 1211 Canonical = getBlockPointerType(getCanonicalType(T)); 1212 1213 // Get the new insert position for the node we care about. 1214 BlockPointerType *NewIP = 1215 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1216 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1217 } 1218 BlockPointerType *New 1219 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1220 Types.push_back(New); 1221 BlockPointerTypes.InsertNode(New, InsertPos); 1222 return QualType(New, 0); 1223} 1224 1225/// getLValueReferenceType - Return the uniqued reference to the type for an 1226/// lvalue reference to the specified type. 1227QualType ASTContext::getLValueReferenceType(QualType T) { 1228 // Unique pointers, to guarantee there is only one pointer of a particular 1229 // structure. 1230 llvm::FoldingSetNodeID ID; 1231 ReferenceType::Profile(ID, T); 1232 1233 void *InsertPos = 0; 1234 if (LValueReferenceType *RT = 1235 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1236 return QualType(RT, 0); 1237 1238 // If the referencee type isn't canonical, this won't be a canonical type 1239 // either, so fill in the canonical type field. 1240 QualType Canonical; 1241 if (!T->isCanonical()) { 1242 Canonical = getLValueReferenceType(getCanonicalType(T)); 1243 1244 // Get the new insert position for the node we care about. 1245 LValueReferenceType *NewIP = 1246 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1247 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1248 } 1249 1250 LValueReferenceType *New 1251 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical); 1252 Types.push_back(New); 1253 LValueReferenceTypes.InsertNode(New, InsertPos); 1254 return QualType(New, 0); 1255} 1256 1257/// getRValueReferenceType - Return the uniqued reference to the type for an 1258/// rvalue reference to the specified type. 1259QualType ASTContext::getRValueReferenceType(QualType T) { 1260 // Unique pointers, to guarantee there is only one pointer of a particular 1261 // structure. 1262 llvm::FoldingSetNodeID ID; 1263 ReferenceType::Profile(ID, T); 1264 1265 void *InsertPos = 0; 1266 if (RValueReferenceType *RT = 1267 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1268 return QualType(RT, 0); 1269 1270 // If the referencee type isn't canonical, this won't be a canonical type 1271 // either, so fill in the canonical type field. 1272 QualType Canonical; 1273 if (!T->isCanonical()) { 1274 Canonical = getRValueReferenceType(getCanonicalType(T)); 1275 1276 // Get the new insert position for the node we care about. 1277 RValueReferenceType *NewIP = 1278 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1279 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1280 } 1281 1282 RValueReferenceType *New 1283 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1284 Types.push_back(New); 1285 RValueReferenceTypes.InsertNode(New, InsertPos); 1286 return QualType(New, 0); 1287} 1288 1289/// getMemberPointerType - Return the uniqued reference to the type for a 1290/// member pointer to the specified type, in the specified class. 1291QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1292 // Unique pointers, to guarantee there is only one pointer of a particular 1293 // structure. 1294 llvm::FoldingSetNodeID ID; 1295 MemberPointerType::Profile(ID, T, Cls); 1296 1297 void *InsertPos = 0; 1298 if (MemberPointerType *PT = 1299 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1300 return QualType(PT, 0); 1301 1302 // If the pointee or class type isn't canonical, this won't be a canonical 1303 // type either, so fill in the canonical type field. 1304 QualType Canonical; 1305 if (!T->isCanonical()) { 1306 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1307 1308 // Get the new insert position for the node we care about. 1309 MemberPointerType *NewIP = 1310 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1311 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1312 } 1313 MemberPointerType *New 1314 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1315 Types.push_back(New); 1316 MemberPointerTypes.InsertNode(New, InsertPos); 1317 return QualType(New, 0); 1318} 1319 1320/// getConstantArrayType - Return the unique reference to the type for an 1321/// array of the specified element type. 1322QualType ASTContext::getConstantArrayType(QualType EltTy, 1323 const llvm::APInt &ArySizeIn, 1324 ArrayType::ArraySizeModifier ASM, 1325 unsigned EltTypeQuals) { 1326 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1327 "Constant array of VLAs is illegal!"); 1328 1329 // Convert the array size into a canonical width matching the pointer size for 1330 // the target. 1331 llvm::APInt ArySize(ArySizeIn); 1332 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1333 1334 llvm::FoldingSetNodeID ID; 1335 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1336 1337 void *InsertPos = 0; 1338 if (ConstantArrayType *ATP = 1339 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1340 return QualType(ATP, 0); 1341 1342 // If the element type isn't canonical, this won't be a canonical type either, 1343 // so fill in the canonical type field. 1344 QualType Canonical; 1345 if (!EltTy->isCanonical()) { 1346 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1347 ASM, EltTypeQuals); 1348 // Get the new insert position for the node we care about. 1349 ConstantArrayType *NewIP = 1350 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1351 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1352 } 1353 1354 ConstantArrayType *New = new(*this,TypeAlignment) 1355 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1356 ConstantArrayTypes.InsertNode(New, InsertPos); 1357 Types.push_back(New); 1358 return QualType(New, 0); 1359} 1360 1361/// getConstantArrayWithExprType - Return a reference to the type for 1362/// an array of the specified element type. 1363QualType 1364ASTContext::getConstantArrayWithExprType(QualType EltTy, 1365 const llvm::APInt &ArySizeIn, 1366 Expr *ArySizeExpr, 1367 ArrayType::ArraySizeModifier ASM, 1368 unsigned EltTypeQuals, 1369 SourceRange Brackets) { 1370 // Convert the array size into a canonical width matching the pointer 1371 // size for the target. 1372 llvm::APInt ArySize(ArySizeIn); 1373 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1374 1375 // Compute the canonical ConstantArrayType. 1376 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1377 ArySize, ASM, EltTypeQuals); 1378 // Since we don't unique expressions, it isn't possible to unique VLA's 1379 // that have an expression provided for their size. 1380 ConstantArrayWithExprType *New = new(*this, TypeAlignment) 1381 ConstantArrayWithExprType(EltTy, Canonical, ArySize, ArySizeExpr, 1382 ASM, EltTypeQuals, Brackets); 1383 Types.push_back(New); 1384 return QualType(New, 0); 1385} 1386 1387/// getConstantArrayWithoutExprType - Return a reference to the type for 1388/// an array of the specified element type. 1389QualType 1390ASTContext::getConstantArrayWithoutExprType(QualType EltTy, 1391 const llvm::APInt &ArySizeIn, 1392 ArrayType::ArraySizeModifier ASM, 1393 unsigned EltTypeQuals) { 1394 // Convert the array size into a canonical width matching the pointer 1395 // size for the target. 1396 llvm::APInt ArySize(ArySizeIn); 1397 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1398 1399 // Compute the canonical ConstantArrayType. 1400 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1401 ArySize, ASM, EltTypeQuals); 1402 ConstantArrayWithoutExprType *New = new(*this, TypeAlignment) 1403 ConstantArrayWithoutExprType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1404 Types.push_back(New); 1405 return QualType(New, 0); 1406} 1407 1408/// getVariableArrayType - Returns a non-unique reference to the type for a 1409/// variable array of the specified element type. 1410QualType ASTContext::getVariableArrayType(QualType EltTy, 1411 Expr *NumElts, 1412 ArrayType::ArraySizeModifier ASM, 1413 unsigned EltTypeQuals, 1414 SourceRange Brackets) { 1415 // Since we don't unique expressions, it isn't possible to unique VLA's 1416 // that have an expression provided for their size. 1417 1418 VariableArrayType *New = new(*this, TypeAlignment) 1419 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1420 1421 VariableArrayTypes.push_back(New); 1422 Types.push_back(New); 1423 return QualType(New, 0); 1424} 1425 1426/// getDependentSizedArrayType - Returns a non-unique reference to 1427/// the type for a dependently-sized array of the specified element 1428/// type. 1429QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1430 Expr *NumElts, 1431 ArrayType::ArraySizeModifier ASM, 1432 unsigned EltTypeQuals, 1433 SourceRange Brackets) { 1434 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1435 "Size must be type- or value-dependent!"); 1436 1437 llvm::FoldingSetNodeID ID; 1438 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1439 EltTypeQuals, NumElts); 1440 1441 void *InsertPos = 0; 1442 DependentSizedArrayType *Canon 1443 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1444 DependentSizedArrayType *New; 1445 if (Canon) { 1446 // We already have a canonical version of this array type; use it as 1447 // the canonical type for a newly-built type. 1448 New = new (*this, TypeAlignment) 1449 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1450 NumElts, ASM, EltTypeQuals, Brackets); 1451 } else { 1452 QualType CanonEltTy = getCanonicalType(EltTy); 1453 if (CanonEltTy == EltTy) { 1454 New = new (*this, TypeAlignment) 1455 DependentSizedArrayType(*this, EltTy, QualType(), 1456 NumElts, ASM, EltTypeQuals, Brackets); 1457 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1458 } else { 1459 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1460 ASM, EltTypeQuals, 1461 SourceRange()); 1462 New = new (*this, TypeAlignment) 1463 DependentSizedArrayType(*this, EltTy, Canon, 1464 NumElts, ASM, EltTypeQuals, Brackets); 1465 } 1466 } 1467 1468 Types.push_back(New); 1469 return QualType(New, 0); 1470} 1471 1472QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1473 ArrayType::ArraySizeModifier ASM, 1474 unsigned EltTypeQuals) { 1475 llvm::FoldingSetNodeID ID; 1476 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1477 1478 void *InsertPos = 0; 1479 if (IncompleteArrayType *ATP = 1480 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1481 return QualType(ATP, 0); 1482 1483 // If the element type isn't canonical, this won't be a canonical type 1484 // either, so fill in the canonical type field. 1485 QualType Canonical; 1486 1487 if (!EltTy->isCanonical()) { 1488 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1489 ASM, EltTypeQuals); 1490 1491 // Get the new insert position for the node we care about. 1492 IncompleteArrayType *NewIP = 1493 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1494 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1495 } 1496 1497 IncompleteArrayType *New = new (*this, TypeAlignment) 1498 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1499 1500 IncompleteArrayTypes.InsertNode(New, InsertPos); 1501 Types.push_back(New); 1502 return QualType(New, 0); 1503} 1504 1505/// getVectorType - Return the unique reference to a vector type of 1506/// the specified element type and size. VectorType must be a built-in type. 1507QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1508 BuiltinType *baseType; 1509 1510 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1511 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1512 1513 // Check if we've already instantiated a vector of this type. 1514 llvm::FoldingSetNodeID ID; 1515 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1516 void *InsertPos = 0; 1517 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1518 return QualType(VTP, 0); 1519 1520 // If the element type isn't canonical, this won't be a canonical type either, 1521 // so fill in the canonical type field. 1522 QualType Canonical; 1523 if (!vecType->isCanonical()) { 1524 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1525 1526 // Get the new insert position for the node we care about. 1527 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1528 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1529 } 1530 VectorType *New = new (*this, TypeAlignment) 1531 VectorType(vecType, NumElts, Canonical); 1532 VectorTypes.InsertNode(New, InsertPos); 1533 Types.push_back(New); 1534 return QualType(New, 0); 1535} 1536 1537/// getExtVectorType - Return the unique reference to an extended vector type of 1538/// the specified element type and size. VectorType must be a built-in type. 1539QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1540 BuiltinType *baseType; 1541 1542 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1543 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1544 1545 // Check if we've already instantiated a vector of this type. 1546 llvm::FoldingSetNodeID ID; 1547 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1548 void *InsertPos = 0; 1549 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1550 return QualType(VTP, 0); 1551 1552 // If the element type isn't canonical, this won't be a canonical type either, 1553 // so fill in the canonical type field. 1554 QualType Canonical; 1555 if (!vecType->isCanonical()) { 1556 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1557 1558 // Get the new insert position for the node we care about. 1559 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1560 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1561 } 1562 ExtVectorType *New = new (*this, TypeAlignment) 1563 ExtVectorType(vecType, NumElts, Canonical); 1564 VectorTypes.InsertNode(New, InsertPos); 1565 Types.push_back(New); 1566 return QualType(New, 0); 1567} 1568 1569QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1570 Expr *SizeExpr, 1571 SourceLocation AttrLoc) { 1572 llvm::FoldingSetNodeID ID; 1573 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1574 SizeExpr); 1575 1576 void *InsertPos = 0; 1577 DependentSizedExtVectorType *Canon 1578 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1579 DependentSizedExtVectorType *New; 1580 if (Canon) { 1581 // We already have a canonical version of this array type; use it as 1582 // the canonical type for a newly-built type. 1583 New = new (*this, TypeAlignment) 1584 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1585 SizeExpr, AttrLoc); 1586 } else { 1587 QualType CanonVecTy = getCanonicalType(vecType); 1588 if (CanonVecTy == vecType) { 1589 New = new (*this, TypeAlignment) 1590 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1591 AttrLoc); 1592 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1593 } else { 1594 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1595 SourceLocation()); 1596 New = new (*this, TypeAlignment) 1597 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1598 } 1599 } 1600 1601 Types.push_back(New); 1602 return QualType(New, 0); 1603} 1604 1605/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1606/// 1607QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1608 // Unique functions, to guarantee there is only one function of a particular 1609 // structure. 1610 llvm::FoldingSetNodeID ID; 1611 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1612 1613 void *InsertPos = 0; 1614 if (FunctionNoProtoType *FT = 1615 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1616 return QualType(FT, 0); 1617 1618 QualType Canonical; 1619 if (!ResultTy->isCanonical()) { 1620 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1621 1622 // Get the new insert position for the node we care about. 1623 FunctionNoProtoType *NewIP = 1624 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1625 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1626 } 1627 1628 FunctionNoProtoType *New = new (*this, TypeAlignment) 1629 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1630 Types.push_back(New); 1631 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1632 return QualType(New, 0); 1633} 1634 1635/// getFunctionType - Return a normal function type with a typed argument 1636/// list. isVariadic indicates whether the argument list includes '...'. 1637QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1638 unsigned NumArgs, bool isVariadic, 1639 unsigned TypeQuals, bool hasExceptionSpec, 1640 bool hasAnyExceptionSpec, unsigned NumExs, 1641 const QualType *ExArray, bool NoReturn) { 1642 if (LangOpts.CPlusPlus) { 1643 for (unsigned i = 0; i != NumArgs; ++i) 1644 assert(!ArgArray[i].hasQualifiers() && 1645 "C++ arguments can't have toplevel qualifiers!"); 1646 } 1647 1648 // Unique functions, to guarantee there is only one function of a particular 1649 // structure. 1650 llvm::FoldingSetNodeID ID; 1651 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1652 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1653 NumExs, ExArray, NoReturn); 1654 1655 void *InsertPos = 0; 1656 if (FunctionProtoType *FTP = 1657 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1658 return QualType(FTP, 0); 1659 1660 // Determine whether the type being created is already canonical or not. 1661 bool isCanonical = ResultTy->isCanonical(); 1662 if (hasExceptionSpec) 1663 isCanonical = false; 1664 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1665 if (!ArgArray[i]->isCanonical()) 1666 isCanonical = false; 1667 1668 // If this type isn't canonical, get the canonical version of it. 1669 // The exception spec is not part of the canonical type. 1670 QualType Canonical; 1671 if (!isCanonical) { 1672 llvm::SmallVector<QualType, 16> CanonicalArgs; 1673 CanonicalArgs.reserve(NumArgs); 1674 for (unsigned i = 0; i != NumArgs; ++i) 1675 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1676 1677 Canonical = getFunctionType(getCanonicalType(ResultTy), 1678 CanonicalArgs.data(), NumArgs, 1679 isVariadic, TypeQuals, false, 1680 false, 0, 0, NoReturn); 1681 1682 // Get the new insert position for the node we care about. 1683 FunctionProtoType *NewIP = 1684 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1685 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1686 } 1687 1688 // FunctionProtoType objects are allocated with extra bytes after them 1689 // for two variable size arrays (for parameter and exception types) at the 1690 // end of them. 1691 FunctionProtoType *FTP = 1692 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1693 NumArgs*sizeof(QualType) + 1694 NumExs*sizeof(QualType), TypeAlignment); 1695 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1696 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1697 ExArray, NumExs, Canonical, NoReturn); 1698 Types.push_back(FTP); 1699 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1700 return QualType(FTP, 0); 1701} 1702 1703/// getTypeDeclType - Return the unique reference to the type for the 1704/// specified type declaration. 1705QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1706 assert(Decl && "Passed null for Decl param"); 1707 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1708 1709 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1710 return getTypedefType(Typedef); 1711 else if (isa<TemplateTypeParmDecl>(Decl)) { 1712 assert(false && "Template type parameter types are always available."); 1713 } else if (ObjCInterfaceDecl *ObjCInterface 1714 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1715 return getObjCInterfaceType(ObjCInterface); 1716 1717 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1718 if (PrevDecl) 1719 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1720 else 1721 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1722 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1723 if (PrevDecl) 1724 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1725 else 1726 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1727 } else 1728 assert(false && "TypeDecl without a type?"); 1729 1730 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1731 return QualType(Decl->TypeForDecl, 0); 1732} 1733 1734/// getTypedefType - Return the unique reference to the type for the 1735/// specified typename decl. 1736QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1737 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1738 1739 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1740 Decl->TypeForDecl = new(*this, TypeAlignment) 1741 TypedefType(Type::Typedef, Decl, Canonical); 1742 Types.push_back(Decl->TypeForDecl); 1743 return QualType(Decl->TypeForDecl, 0); 1744} 1745 1746/// \brief Retrieve the template type parameter type for a template 1747/// parameter or parameter pack with the given depth, index, and (optionally) 1748/// name. 1749QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1750 bool ParameterPack, 1751 IdentifierInfo *Name) { 1752 llvm::FoldingSetNodeID ID; 1753 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1754 void *InsertPos = 0; 1755 TemplateTypeParmType *TypeParm 1756 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1757 1758 if (TypeParm) 1759 return QualType(TypeParm, 0); 1760 1761 if (Name) { 1762 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1763 TypeParm = new (*this, TypeAlignment) 1764 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1765 } else 1766 TypeParm = new (*this, TypeAlignment) 1767 TemplateTypeParmType(Depth, Index, ParameterPack); 1768 1769 Types.push_back(TypeParm); 1770 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1771 1772 return QualType(TypeParm, 0); 1773} 1774 1775QualType 1776ASTContext::getTemplateSpecializationType(TemplateName Template, 1777 const TemplateArgument *Args, 1778 unsigned NumArgs, 1779 QualType Canon) { 1780 if (!Canon.isNull()) 1781 Canon = getCanonicalType(Canon); 1782 else { 1783 // Build the canonical template specialization type. 1784 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1785 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1786 CanonArgs.reserve(NumArgs); 1787 for (unsigned I = 0; I != NumArgs; ++I) 1788 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1789 1790 // Determine whether this canonical template specialization type already 1791 // exists. 1792 llvm::FoldingSetNodeID ID; 1793 TemplateSpecializationType::Profile(ID, CanonTemplate, 1794 CanonArgs.data(), NumArgs, *this); 1795 1796 void *InsertPos = 0; 1797 TemplateSpecializationType *Spec 1798 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1799 1800 if (!Spec) { 1801 // Allocate a new canonical template specialization type. 1802 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1803 sizeof(TemplateArgument) * NumArgs), 1804 TypeAlignment); 1805 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1806 CanonArgs.data(), NumArgs, 1807 Canon); 1808 Types.push_back(Spec); 1809 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1810 } 1811 1812 if (Canon.isNull()) 1813 Canon = QualType(Spec, 0); 1814 assert(Canon->isDependentType() && 1815 "Non-dependent template-id type must have a canonical type"); 1816 } 1817 1818 // Allocate the (non-canonical) template specialization type, but don't 1819 // try to unique it: these types typically have location information that 1820 // we don't unique and don't want to lose. 1821 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1822 sizeof(TemplateArgument) * NumArgs), 1823 TypeAlignment); 1824 TemplateSpecializationType *Spec 1825 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1826 Canon); 1827 1828 Types.push_back(Spec); 1829 return QualType(Spec, 0); 1830} 1831 1832QualType 1833ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1834 QualType NamedType) { 1835 llvm::FoldingSetNodeID ID; 1836 QualifiedNameType::Profile(ID, NNS, NamedType); 1837 1838 void *InsertPos = 0; 1839 QualifiedNameType *T 1840 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1841 if (T) 1842 return QualType(T, 0); 1843 1844 T = new (*this) QualifiedNameType(NNS, NamedType, 1845 getCanonicalType(NamedType)); 1846 Types.push_back(T); 1847 QualifiedNameTypes.InsertNode(T, InsertPos); 1848 return QualType(T, 0); 1849} 1850 1851QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1852 const IdentifierInfo *Name, 1853 QualType Canon) { 1854 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1855 1856 if (Canon.isNull()) { 1857 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1858 if (CanonNNS != NNS) 1859 Canon = getTypenameType(CanonNNS, Name); 1860 } 1861 1862 llvm::FoldingSetNodeID ID; 1863 TypenameType::Profile(ID, NNS, Name); 1864 1865 void *InsertPos = 0; 1866 TypenameType *T 1867 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1868 if (T) 1869 return QualType(T, 0); 1870 1871 T = new (*this) TypenameType(NNS, Name, Canon); 1872 Types.push_back(T); 1873 TypenameTypes.InsertNode(T, InsertPos); 1874 return QualType(T, 0); 1875} 1876 1877QualType 1878ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1879 const TemplateSpecializationType *TemplateId, 1880 QualType Canon) { 1881 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1882 1883 if (Canon.isNull()) { 1884 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1885 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1886 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1887 const TemplateSpecializationType *CanonTemplateId 1888 = CanonType->getAs<TemplateSpecializationType>(); 1889 assert(CanonTemplateId && 1890 "Canonical type must also be a template specialization type"); 1891 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1892 } 1893 } 1894 1895 llvm::FoldingSetNodeID ID; 1896 TypenameType::Profile(ID, NNS, TemplateId); 1897 1898 void *InsertPos = 0; 1899 TypenameType *T 1900 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1901 if (T) 1902 return QualType(T, 0); 1903 1904 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1905 Types.push_back(T); 1906 TypenameTypes.InsertNode(T, InsertPos); 1907 return QualType(T, 0); 1908} 1909 1910QualType 1911ASTContext::getElaboratedType(QualType UnderlyingType, 1912 ElaboratedType::TagKind Tag) { 1913 llvm::FoldingSetNodeID ID; 1914 ElaboratedType::Profile(ID, UnderlyingType, Tag); 1915 1916 void *InsertPos = 0; 1917 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 1918 if (T) 1919 return QualType(T, 0); 1920 1921 QualType Canon = getCanonicalType(UnderlyingType); 1922 1923 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 1924 Types.push_back(T); 1925 ElaboratedTypes.InsertNode(T, InsertPos); 1926 return QualType(T, 0); 1927} 1928 1929/// CmpProtocolNames - Comparison predicate for sorting protocols 1930/// alphabetically. 1931static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1932 const ObjCProtocolDecl *RHS) { 1933 return LHS->getDeclName() < RHS->getDeclName(); 1934} 1935 1936static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1937 unsigned &NumProtocols) { 1938 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1939 1940 // Sort protocols, keyed by name. 1941 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1942 1943 // Remove duplicates. 1944 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1945 NumProtocols = ProtocolsEnd-Protocols; 1946} 1947 1948/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1949/// the given interface decl and the conforming protocol list. 1950QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1951 ObjCProtocolDecl **Protocols, 1952 unsigned NumProtocols) { 1953 // Sort the protocol list alphabetically to canonicalize it. 1954 if (NumProtocols) 1955 SortAndUniqueProtocols(Protocols, NumProtocols); 1956 1957 llvm::FoldingSetNodeID ID; 1958 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1959 1960 void *InsertPos = 0; 1961 if (ObjCObjectPointerType *QT = 1962 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1963 return QualType(QT, 0); 1964 1965 // No Match; 1966 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 1967 ObjCObjectPointerType(InterfaceT, Protocols, NumProtocols); 1968 1969 Types.push_back(QType); 1970 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1971 return QualType(QType, 0); 1972} 1973 1974/// getObjCInterfaceType - Return the unique reference to the type for the 1975/// specified ObjC interface decl. The list of protocols is optional. 1976QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1977 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1978 if (NumProtocols) 1979 // Sort the protocol list alphabetically to canonicalize it. 1980 SortAndUniqueProtocols(Protocols, NumProtocols); 1981 1982 llvm::FoldingSetNodeID ID; 1983 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1984 1985 void *InsertPos = 0; 1986 if (ObjCInterfaceType *QT = 1987 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1988 return QualType(QT, 0); 1989 1990 // No Match; 1991 ObjCInterfaceType *QType = new (*this, TypeAlignment) 1992 ObjCInterfaceType(const_cast<ObjCInterfaceDecl*>(Decl), 1993 Protocols, NumProtocols); 1994 Types.push_back(QType); 1995 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 1996 return QualType(QType, 0); 1997} 1998 1999QualType ASTContext::getObjCProtocolListType(QualType T, 2000 ObjCProtocolDecl **Protocols, 2001 unsigned NumProtocols) { 2002 llvm::FoldingSetNodeID ID; 2003 ObjCProtocolListType::Profile(ID, T, Protocols, NumProtocols); 2004 2005 void *InsertPos = 0; 2006 if (ObjCProtocolListType *QT = 2007 ObjCProtocolListTypes.FindNodeOrInsertPos(ID, InsertPos)) 2008 return QualType(QT, 0); 2009 2010 // No Match; 2011 ObjCProtocolListType *QType = new (*this, TypeAlignment) 2012 ObjCProtocolListType(T, Protocols, NumProtocols); 2013 Types.push_back(QType); 2014 ObjCProtocolListTypes.InsertNode(QType, InsertPos); 2015 return QualType(QType, 0); 2016} 2017 2018/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2019/// TypeOfExprType AST's (since expression's are never shared). For example, 2020/// multiple declarations that refer to "typeof(x)" all contain different 2021/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2022/// on canonical type's (which are always unique). 2023QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2024 TypeOfExprType *toe; 2025 if (tofExpr->isTypeDependent()) { 2026 llvm::FoldingSetNodeID ID; 2027 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2028 2029 void *InsertPos = 0; 2030 DependentTypeOfExprType *Canon 2031 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2032 if (Canon) { 2033 // We already have a "canonical" version of an identical, dependent 2034 // typeof(expr) type. Use that as our canonical type. 2035 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2036 QualType((TypeOfExprType*)Canon, 0)); 2037 } 2038 else { 2039 // Build a new, canonical typeof(expr) type. 2040 Canon 2041 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2042 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2043 toe = Canon; 2044 } 2045 } else { 2046 QualType Canonical = getCanonicalType(tofExpr->getType()); 2047 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2048 } 2049 Types.push_back(toe); 2050 return QualType(toe, 0); 2051} 2052 2053/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2054/// TypeOfType AST's. The only motivation to unique these nodes would be 2055/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2056/// an issue. This doesn't effect the type checker, since it operates 2057/// on canonical type's (which are always unique). 2058QualType ASTContext::getTypeOfType(QualType tofType) { 2059 QualType Canonical = getCanonicalType(tofType); 2060 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2061 Types.push_back(tot); 2062 return QualType(tot, 0); 2063} 2064 2065/// getDecltypeForExpr - Given an expr, will return the decltype for that 2066/// expression, according to the rules in C++0x [dcl.type.simple]p4 2067static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2068 if (e->isTypeDependent()) 2069 return Context.DependentTy; 2070 2071 // If e is an id expression or a class member access, decltype(e) is defined 2072 // as the type of the entity named by e. 2073 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2074 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2075 return VD->getType(); 2076 } 2077 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2078 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2079 return FD->getType(); 2080 } 2081 // If e is a function call or an invocation of an overloaded operator, 2082 // (parentheses around e are ignored), decltype(e) is defined as the 2083 // return type of that function. 2084 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2085 return CE->getCallReturnType(); 2086 2087 QualType T = e->getType(); 2088 2089 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2090 // defined as T&, otherwise decltype(e) is defined as T. 2091 if (e->isLvalue(Context) == Expr::LV_Valid) 2092 T = Context.getLValueReferenceType(T); 2093 2094 return T; 2095} 2096 2097/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2098/// DecltypeType AST's. The only motivation to unique these nodes would be 2099/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2100/// an issue. This doesn't effect the type checker, since it operates 2101/// on canonical type's (which are always unique). 2102QualType ASTContext::getDecltypeType(Expr *e) { 2103 DecltypeType *dt; 2104 if (e->isTypeDependent()) { 2105 llvm::FoldingSetNodeID ID; 2106 DependentDecltypeType::Profile(ID, *this, e); 2107 2108 void *InsertPos = 0; 2109 DependentDecltypeType *Canon 2110 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2111 if (Canon) { 2112 // We already have a "canonical" version of an equivalent, dependent 2113 // decltype type. Use that as our canonical type. 2114 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2115 QualType((DecltypeType*)Canon, 0)); 2116 } 2117 else { 2118 // Build a new, canonical typeof(expr) type. 2119 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2120 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2121 dt = Canon; 2122 } 2123 } else { 2124 QualType T = getDecltypeForExpr(e, *this); 2125 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2126 } 2127 Types.push_back(dt); 2128 return QualType(dt, 0); 2129} 2130 2131/// getTagDeclType - Return the unique reference to the type for the 2132/// specified TagDecl (struct/union/class/enum) decl. 2133QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2134 assert (Decl); 2135 // FIXME: What is the design on getTagDeclType when it requires casting 2136 // away const? mutable? 2137 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2138} 2139 2140/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2141/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2142/// needs to agree with the definition in <stddef.h>. 2143QualType ASTContext::getSizeType() const { 2144 return getFromTargetType(Target.getSizeType()); 2145} 2146 2147/// getSignedWCharType - Return the type of "signed wchar_t". 2148/// Used when in C++, as a GCC extension. 2149QualType ASTContext::getSignedWCharType() const { 2150 // FIXME: derive from "Target" ? 2151 return WCharTy; 2152} 2153 2154/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2155/// Used when in C++, as a GCC extension. 2156QualType ASTContext::getUnsignedWCharType() const { 2157 // FIXME: derive from "Target" ? 2158 return UnsignedIntTy; 2159} 2160 2161/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2162/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2163QualType ASTContext::getPointerDiffType() const { 2164 return getFromTargetType(Target.getPtrDiffType(0)); 2165} 2166 2167//===----------------------------------------------------------------------===// 2168// Type Operators 2169//===----------------------------------------------------------------------===// 2170 2171/// getCanonicalType - Return the canonical (structural) type corresponding to 2172/// the specified potentially non-canonical type. The non-canonical version 2173/// of a type may have many "decorated" versions of types. Decorators can 2174/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2175/// to be free of any of these, allowing two canonical types to be compared 2176/// for exact equality with a simple pointer comparison. 2177CanQualType ASTContext::getCanonicalType(QualType T) { 2178 QualifierCollector Quals; 2179 const Type *Ptr = Quals.strip(T); 2180 QualType CanType = Ptr->getCanonicalTypeInternal(); 2181 2182 // The canonical internal type will be the canonical type *except* 2183 // that we push type qualifiers down through array types. 2184 2185 // If there are no new qualifiers to push down, stop here. 2186 if (!Quals.hasQualifiers()) 2187 return CanQualType::CreateUnsafe(CanType); 2188 2189 // If the type qualifiers are on an array type, get the canonical 2190 // type of the array with the qualifiers applied to the element 2191 // type. 2192 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2193 if (!AT) 2194 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2195 2196 // Get the canonical version of the element with the extra qualifiers on it. 2197 // This can recursively sink qualifiers through multiple levels of arrays. 2198 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2199 NewEltTy = getCanonicalType(NewEltTy); 2200 2201 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2202 return CanQualType::CreateUnsafe( 2203 getConstantArrayType(NewEltTy, CAT->getSize(), 2204 CAT->getSizeModifier(), 2205 CAT->getIndexTypeCVRQualifiers())); 2206 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2207 return CanQualType::CreateUnsafe( 2208 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2209 IAT->getIndexTypeCVRQualifiers())); 2210 2211 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2212 return CanQualType::CreateUnsafe( 2213 getDependentSizedArrayType(NewEltTy, 2214 DSAT->getSizeExpr() ? 2215 DSAT->getSizeExpr()->Retain() : 0, 2216 DSAT->getSizeModifier(), 2217 DSAT->getIndexTypeCVRQualifiers(), 2218 DSAT->getBracketsRange())); 2219 2220 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2221 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2222 VAT->getSizeExpr() ? 2223 VAT->getSizeExpr()->Retain() : 0, 2224 VAT->getSizeModifier(), 2225 VAT->getIndexTypeCVRQualifiers(), 2226 VAT->getBracketsRange())); 2227} 2228 2229TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2230 // If this template name refers to a template, the canonical 2231 // template name merely stores the template itself. 2232 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2233 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2234 2235 // If this template name refers to a set of overloaded function templates, 2236 /// the canonical template name merely stores the set of function templates. 2237 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) { 2238 OverloadedFunctionDecl *CanonOvl = 0; 2239 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 2240 FEnd = Ovl->function_end(); 2241 F != FEnd; ++F) { 2242 Decl *Canon = F->get()->getCanonicalDecl(); 2243 if (CanonOvl || Canon != F->get()) { 2244 if (!CanonOvl) 2245 CanonOvl = OverloadedFunctionDecl::Create(*this, 2246 Ovl->getDeclContext(), 2247 Ovl->getDeclName()); 2248 2249 CanonOvl->addOverload( 2250 AnyFunctionDecl::getFromNamedDecl(cast<NamedDecl>(Canon))); 2251 } 2252 } 2253 2254 return TemplateName(CanonOvl? CanonOvl : Ovl); 2255 } 2256 2257 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2258 assert(DTN && "Non-dependent template names must refer to template decls."); 2259 return DTN->CanonicalTemplateName; 2260} 2261 2262TemplateArgument 2263ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2264 switch (Arg.getKind()) { 2265 case TemplateArgument::Null: 2266 return Arg; 2267 2268 case TemplateArgument::Expression: 2269 // FIXME: Build canonical expression? 2270 return Arg; 2271 2272 case TemplateArgument::Declaration: 2273 return TemplateArgument(SourceLocation(), 2274 Arg.getAsDecl()->getCanonicalDecl()); 2275 2276 case TemplateArgument::Integral: 2277 return TemplateArgument(SourceLocation(), 2278 *Arg.getAsIntegral(), 2279 getCanonicalType(Arg.getIntegralType())); 2280 2281 case TemplateArgument::Type: 2282 return TemplateArgument(SourceLocation(), 2283 getCanonicalType(Arg.getAsType())); 2284 2285 case TemplateArgument::Pack: { 2286 // FIXME: Allocate in ASTContext 2287 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2288 unsigned Idx = 0; 2289 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2290 AEnd = Arg.pack_end(); 2291 A != AEnd; (void)++A, ++Idx) 2292 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2293 2294 TemplateArgument Result; 2295 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2296 return Result; 2297 } 2298 } 2299 2300 // Silence GCC warning 2301 assert(false && "Unhandled template argument kind"); 2302 return TemplateArgument(); 2303} 2304 2305NestedNameSpecifier * 2306ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2307 if (!NNS) 2308 return 0; 2309 2310 switch (NNS->getKind()) { 2311 case NestedNameSpecifier::Identifier: 2312 // Canonicalize the prefix but keep the identifier the same. 2313 return NestedNameSpecifier::Create(*this, 2314 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2315 NNS->getAsIdentifier()); 2316 2317 case NestedNameSpecifier::Namespace: 2318 // A namespace is canonical; build a nested-name-specifier with 2319 // this namespace and no prefix. 2320 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2321 2322 case NestedNameSpecifier::TypeSpec: 2323 case NestedNameSpecifier::TypeSpecWithTemplate: { 2324 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2325 return NestedNameSpecifier::Create(*this, 0, 2326 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2327 T.getTypePtr()); 2328 } 2329 2330 case NestedNameSpecifier::Global: 2331 // The global specifier is canonical and unique. 2332 return NNS; 2333 } 2334 2335 // Required to silence a GCC warning 2336 return 0; 2337} 2338 2339 2340const ArrayType *ASTContext::getAsArrayType(QualType T) { 2341 // Handle the non-qualified case efficiently. 2342 if (!T.hasQualifiers()) { 2343 // Handle the common positive case fast. 2344 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2345 return AT; 2346 } 2347 2348 // Handle the common negative case fast. 2349 QualType CType = T->getCanonicalTypeInternal(); 2350 if (!isa<ArrayType>(CType)) 2351 return 0; 2352 2353 // Apply any qualifiers from the array type to the element type. This 2354 // implements C99 6.7.3p8: "If the specification of an array type includes 2355 // any type qualifiers, the element type is so qualified, not the array type." 2356 2357 // If we get here, we either have type qualifiers on the type, or we have 2358 // sugar such as a typedef in the way. If we have type qualifiers on the type 2359 // we must propagate them down into the element type. 2360 2361 QualifierCollector Qs; 2362 const Type *Ty = Qs.strip(T.getDesugaredType()); 2363 2364 // If we have a simple case, just return now. 2365 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2366 if (ATy == 0 || Qs.empty()) 2367 return ATy; 2368 2369 // Otherwise, we have an array and we have qualifiers on it. Push the 2370 // qualifiers into the array element type and return a new array type. 2371 // Get the canonical version of the element with the extra qualifiers on it. 2372 // This can recursively sink qualifiers through multiple levels of arrays. 2373 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2374 2375 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2376 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2377 CAT->getSizeModifier(), 2378 CAT->getIndexTypeCVRQualifiers())); 2379 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2380 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2381 IAT->getSizeModifier(), 2382 IAT->getIndexTypeCVRQualifiers())); 2383 2384 if (const DependentSizedArrayType *DSAT 2385 = dyn_cast<DependentSizedArrayType>(ATy)) 2386 return cast<ArrayType>( 2387 getDependentSizedArrayType(NewEltTy, 2388 DSAT->getSizeExpr() ? 2389 DSAT->getSizeExpr()->Retain() : 0, 2390 DSAT->getSizeModifier(), 2391 DSAT->getIndexTypeCVRQualifiers(), 2392 DSAT->getBracketsRange())); 2393 2394 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2395 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2396 VAT->getSizeExpr() ? 2397 VAT->getSizeExpr()->Retain() : 0, 2398 VAT->getSizeModifier(), 2399 VAT->getIndexTypeCVRQualifiers(), 2400 VAT->getBracketsRange())); 2401} 2402 2403 2404/// getArrayDecayedType - Return the properly qualified result of decaying the 2405/// specified array type to a pointer. This operation is non-trivial when 2406/// handling typedefs etc. The canonical type of "T" must be an array type, 2407/// this returns a pointer to a properly qualified element of the array. 2408/// 2409/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2410QualType ASTContext::getArrayDecayedType(QualType Ty) { 2411 // Get the element type with 'getAsArrayType' so that we don't lose any 2412 // typedefs in the element type of the array. This also handles propagation 2413 // of type qualifiers from the array type into the element type if present 2414 // (C99 6.7.3p8). 2415 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2416 assert(PrettyArrayType && "Not an array type!"); 2417 2418 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2419 2420 // int x[restrict 4] -> int *restrict 2421 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2422} 2423 2424QualType ASTContext::getBaseElementType(QualType QT) { 2425 QualifierCollector Qs; 2426 while (true) { 2427 const Type *UT = Qs.strip(QT); 2428 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2429 QT = AT->getElementType(); 2430 } else { 2431 return Qs.apply(QT); 2432 } 2433 } 2434} 2435 2436QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2437 QualType ElemTy = AT->getElementType(); 2438 2439 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2440 return getBaseElementType(AT); 2441 2442 return ElemTy; 2443} 2444 2445/// getConstantArrayElementCount - Returns number of constant array elements. 2446uint64_t 2447ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2448 uint64_t ElementCount = 1; 2449 do { 2450 ElementCount *= CA->getSize().getZExtValue(); 2451 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2452 } while (CA); 2453 return ElementCount; 2454} 2455 2456/// getFloatingRank - Return a relative rank for floating point types. 2457/// This routine will assert if passed a built-in type that isn't a float. 2458static FloatingRank getFloatingRank(QualType T) { 2459 if (const ComplexType *CT = T->getAs<ComplexType>()) 2460 return getFloatingRank(CT->getElementType()); 2461 2462 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2463 switch (T->getAs<BuiltinType>()->getKind()) { 2464 default: assert(0 && "getFloatingRank(): not a floating type"); 2465 case BuiltinType::Float: return FloatRank; 2466 case BuiltinType::Double: return DoubleRank; 2467 case BuiltinType::LongDouble: return LongDoubleRank; 2468 } 2469} 2470 2471/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2472/// point or a complex type (based on typeDomain/typeSize). 2473/// 'typeDomain' is a real floating point or complex type. 2474/// 'typeSize' is a real floating point or complex type. 2475QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2476 QualType Domain) const { 2477 FloatingRank EltRank = getFloatingRank(Size); 2478 if (Domain->isComplexType()) { 2479 switch (EltRank) { 2480 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2481 case FloatRank: return FloatComplexTy; 2482 case DoubleRank: return DoubleComplexTy; 2483 case LongDoubleRank: return LongDoubleComplexTy; 2484 } 2485 } 2486 2487 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2488 switch (EltRank) { 2489 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2490 case FloatRank: return FloatTy; 2491 case DoubleRank: return DoubleTy; 2492 case LongDoubleRank: return LongDoubleTy; 2493 } 2494} 2495 2496/// getFloatingTypeOrder - Compare the rank of the two specified floating 2497/// point types, ignoring the domain of the type (i.e. 'double' == 2498/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2499/// LHS < RHS, return -1. 2500int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2501 FloatingRank LHSR = getFloatingRank(LHS); 2502 FloatingRank RHSR = getFloatingRank(RHS); 2503 2504 if (LHSR == RHSR) 2505 return 0; 2506 if (LHSR > RHSR) 2507 return 1; 2508 return -1; 2509} 2510 2511/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2512/// routine will assert if passed a built-in type that isn't an integer or enum, 2513/// or if it is not canonicalized. 2514unsigned ASTContext::getIntegerRank(Type *T) { 2515 assert(T->isCanonical() && "T should be canonicalized"); 2516 if (EnumType* ET = dyn_cast<EnumType>(T)) 2517 T = ET->getDecl()->getIntegerType().getTypePtr(); 2518 2519 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2520 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2521 2522 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2523 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2524 2525 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2526 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2527 2528 // There are two things which impact the integer rank: the width, and 2529 // the ordering of builtins. The builtin ordering is encoded in the 2530 // bottom three bits; the width is encoded in the bits above that. 2531 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2532 return FWIT->getWidth() << 3; 2533 2534 switch (cast<BuiltinType>(T)->getKind()) { 2535 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2536 case BuiltinType::Bool: 2537 return 1 + (getIntWidth(BoolTy) << 3); 2538 case BuiltinType::Char_S: 2539 case BuiltinType::Char_U: 2540 case BuiltinType::SChar: 2541 case BuiltinType::UChar: 2542 return 2 + (getIntWidth(CharTy) << 3); 2543 case BuiltinType::Short: 2544 case BuiltinType::UShort: 2545 return 3 + (getIntWidth(ShortTy) << 3); 2546 case BuiltinType::Int: 2547 case BuiltinType::UInt: 2548 return 4 + (getIntWidth(IntTy) << 3); 2549 case BuiltinType::Long: 2550 case BuiltinType::ULong: 2551 return 5 + (getIntWidth(LongTy) << 3); 2552 case BuiltinType::LongLong: 2553 case BuiltinType::ULongLong: 2554 return 6 + (getIntWidth(LongLongTy) << 3); 2555 case BuiltinType::Int128: 2556 case BuiltinType::UInt128: 2557 return 7 + (getIntWidth(Int128Ty) << 3); 2558 } 2559} 2560 2561/// \brief Whether this is a promotable bitfield reference according 2562/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2563/// 2564/// \returns the type this bit-field will promote to, or NULL if no 2565/// promotion occurs. 2566QualType ASTContext::isPromotableBitField(Expr *E) { 2567 FieldDecl *Field = E->getBitField(); 2568 if (!Field) 2569 return QualType(); 2570 2571 QualType FT = Field->getType(); 2572 2573 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2574 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2575 uint64_t IntSize = getTypeSize(IntTy); 2576 // GCC extension compatibility: if the bit-field size is less than or equal 2577 // to the size of int, it gets promoted no matter what its type is. 2578 // For instance, unsigned long bf : 4 gets promoted to signed int. 2579 if (BitWidth < IntSize) 2580 return IntTy; 2581 2582 if (BitWidth == IntSize) 2583 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2584 2585 // Types bigger than int are not subject to promotions, and therefore act 2586 // like the base type. 2587 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2588 // is ridiculous. 2589 return QualType(); 2590} 2591 2592/// getPromotedIntegerType - Returns the type that Promotable will 2593/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2594/// integer type. 2595QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2596 assert(!Promotable.isNull()); 2597 assert(Promotable->isPromotableIntegerType()); 2598 if (Promotable->isSignedIntegerType()) 2599 return IntTy; 2600 uint64_t PromotableSize = getTypeSize(Promotable); 2601 uint64_t IntSize = getTypeSize(IntTy); 2602 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2603 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2604} 2605 2606/// getIntegerTypeOrder - Returns the highest ranked integer type: 2607/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2608/// LHS < RHS, return -1. 2609int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2610 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2611 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2612 if (LHSC == RHSC) return 0; 2613 2614 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2615 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2616 2617 unsigned LHSRank = getIntegerRank(LHSC); 2618 unsigned RHSRank = getIntegerRank(RHSC); 2619 2620 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2621 if (LHSRank == RHSRank) return 0; 2622 return LHSRank > RHSRank ? 1 : -1; 2623 } 2624 2625 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2626 if (LHSUnsigned) { 2627 // If the unsigned [LHS] type is larger, return it. 2628 if (LHSRank >= RHSRank) 2629 return 1; 2630 2631 // If the signed type can represent all values of the unsigned type, it 2632 // wins. Because we are dealing with 2's complement and types that are 2633 // powers of two larger than each other, this is always safe. 2634 return -1; 2635 } 2636 2637 // If the unsigned [RHS] type is larger, return it. 2638 if (RHSRank >= LHSRank) 2639 return -1; 2640 2641 // If the signed type can represent all values of the unsigned type, it 2642 // wins. Because we are dealing with 2's complement and types that are 2643 // powers of two larger than each other, this is always safe. 2644 return 1; 2645} 2646 2647// getCFConstantStringType - Return the type used for constant CFStrings. 2648QualType ASTContext::getCFConstantStringType() { 2649 if (!CFConstantStringTypeDecl) { 2650 CFConstantStringTypeDecl = 2651 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2652 &Idents.get("NSConstantString")); 2653 QualType FieldTypes[4]; 2654 2655 // const int *isa; 2656 FieldTypes[0] = getPointerType(IntTy.withConst()); 2657 // int flags; 2658 FieldTypes[1] = IntTy; 2659 // const char *str; 2660 FieldTypes[2] = getPointerType(CharTy.withConst()); 2661 // long length; 2662 FieldTypes[3] = LongTy; 2663 2664 // Create fields 2665 for (unsigned i = 0; i < 4; ++i) { 2666 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2667 SourceLocation(), 0, 2668 FieldTypes[i], /*DInfo=*/0, 2669 /*BitWidth=*/0, 2670 /*Mutable=*/false); 2671 CFConstantStringTypeDecl->addDecl(Field); 2672 } 2673 2674 CFConstantStringTypeDecl->completeDefinition(*this); 2675 } 2676 2677 return getTagDeclType(CFConstantStringTypeDecl); 2678} 2679 2680void ASTContext::setCFConstantStringType(QualType T) { 2681 const RecordType *Rec = T->getAs<RecordType>(); 2682 assert(Rec && "Invalid CFConstantStringType"); 2683 CFConstantStringTypeDecl = Rec->getDecl(); 2684} 2685 2686QualType ASTContext::getObjCFastEnumerationStateType() { 2687 if (!ObjCFastEnumerationStateTypeDecl) { 2688 ObjCFastEnumerationStateTypeDecl = 2689 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2690 &Idents.get("__objcFastEnumerationState")); 2691 2692 QualType FieldTypes[] = { 2693 UnsignedLongTy, 2694 getPointerType(ObjCIdTypedefType), 2695 getPointerType(UnsignedLongTy), 2696 getConstantArrayType(UnsignedLongTy, 2697 llvm::APInt(32, 5), ArrayType::Normal, 0) 2698 }; 2699 2700 for (size_t i = 0; i < 4; ++i) { 2701 FieldDecl *Field = FieldDecl::Create(*this, 2702 ObjCFastEnumerationStateTypeDecl, 2703 SourceLocation(), 0, 2704 FieldTypes[i], /*DInfo=*/0, 2705 /*BitWidth=*/0, 2706 /*Mutable=*/false); 2707 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2708 } 2709 2710 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2711 } 2712 2713 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2714} 2715 2716void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2717 const RecordType *Rec = T->getAs<RecordType>(); 2718 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2719 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2720} 2721 2722// This returns true if a type has been typedefed to BOOL: 2723// typedef <type> BOOL; 2724static bool isTypeTypedefedAsBOOL(QualType T) { 2725 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2726 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2727 return II->isStr("BOOL"); 2728 2729 return false; 2730} 2731 2732/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2733/// purpose. 2734int ASTContext::getObjCEncodingTypeSize(QualType type) { 2735 uint64_t sz = getTypeSize(type); 2736 2737 // Make all integer and enum types at least as large as an int 2738 if (sz > 0 && type->isIntegralType()) 2739 sz = std::max(sz, getTypeSize(IntTy)); 2740 // Treat arrays as pointers, since that's how they're passed in. 2741 else if (type->isArrayType()) 2742 sz = getTypeSize(VoidPtrTy); 2743 return sz / getTypeSize(CharTy); 2744} 2745 2746/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2747/// declaration. 2748void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2749 std::string& S) { 2750 // FIXME: This is not very efficient. 2751 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2752 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2753 // Encode result type. 2754 getObjCEncodingForType(Decl->getResultType(), S); 2755 // Compute size of all parameters. 2756 // Start with computing size of a pointer in number of bytes. 2757 // FIXME: There might(should) be a better way of doing this computation! 2758 SourceLocation Loc; 2759 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2760 // The first two arguments (self and _cmd) are pointers; account for 2761 // their size. 2762 int ParmOffset = 2 * PtrSize; 2763 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2764 E = Decl->param_end(); PI != E; ++PI) { 2765 QualType PType = (*PI)->getType(); 2766 int sz = getObjCEncodingTypeSize(PType); 2767 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2768 ParmOffset += sz; 2769 } 2770 S += llvm::utostr(ParmOffset); 2771 S += "@0:"; 2772 S += llvm::utostr(PtrSize); 2773 2774 // Argument types. 2775 ParmOffset = 2 * PtrSize; 2776 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2777 E = Decl->param_end(); PI != E; ++PI) { 2778 ParmVarDecl *PVDecl = *PI; 2779 QualType PType = PVDecl->getOriginalType(); 2780 if (const ArrayType *AT = 2781 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2782 // Use array's original type only if it has known number of 2783 // elements. 2784 if (!isa<ConstantArrayType>(AT)) 2785 PType = PVDecl->getType(); 2786 } else if (PType->isFunctionType()) 2787 PType = PVDecl->getType(); 2788 // Process argument qualifiers for user supplied arguments; such as, 2789 // 'in', 'inout', etc. 2790 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2791 getObjCEncodingForType(PType, S); 2792 S += llvm::utostr(ParmOffset); 2793 ParmOffset += getObjCEncodingTypeSize(PType); 2794 } 2795} 2796 2797/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2798/// property declaration. If non-NULL, Container must be either an 2799/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2800/// NULL when getting encodings for protocol properties. 2801/// Property attributes are stored as a comma-delimited C string. The simple 2802/// attributes readonly and bycopy are encoded as single characters. The 2803/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2804/// encoded as single characters, followed by an identifier. Property types 2805/// are also encoded as a parametrized attribute. The characters used to encode 2806/// these attributes are defined by the following enumeration: 2807/// @code 2808/// enum PropertyAttributes { 2809/// kPropertyReadOnly = 'R', // property is read-only. 2810/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2811/// kPropertyByref = '&', // property is a reference to the value last assigned 2812/// kPropertyDynamic = 'D', // property is dynamic 2813/// kPropertyGetter = 'G', // followed by getter selector name 2814/// kPropertySetter = 'S', // followed by setter selector name 2815/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2816/// kPropertyType = 't' // followed by old-style type encoding. 2817/// kPropertyWeak = 'W' // 'weak' property 2818/// kPropertyStrong = 'P' // property GC'able 2819/// kPropertyNonAtomic = 'N' // property non-atomic 2820/// }; 2821/// @endcode 2822void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2823 const Decl *Container, 2824 std::string& S) { 2825 // Collect information from the property implementation decl(s). 2826 bool Dynamic = false; 2827 ObjCPropertyImplDecl *SynthesizePID = 0; 2828 2829 // FIXME: Duplicated code due to poor abstraction. 2830 if (Container) { 2831 if (const ObjCCategoryImplDecl *CID = 2832 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2833 for (ObjCCategoryImplDecl::propimpl_iterator 2834 i = CID->propimpl_begin(), e = CID->propimpl_end(); 2835 i != e; ++i) { 2836 ObjCPropertyImplDecl *PID = *i; 2837 if (PID->getPropertyDecl() == PD) { 2838 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2839 Dynamic = true; 2840 } else { 2841 SynthesizePID = PID; 2842 } 2843 } 2844 } 2845 } else { 2846 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2847 for (ObjCCategoryImplDecl::propimpl_iterator 2848 i = OID->propimpl_begin(), e = OID->propimpl_end(); 2849 i != e; ++i) { 2850 ObjCPropertyImplDecl *PID = *i; 2851 if (PID->getPropertyDecl() == PD) { 2852 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2853 Dynamic = true; 2854 } else { 2855 SynthesizePID = PID; 2856 } 2857 } 2858 } 2859 } 2860 } 2861 2862 // FIXME: This is not very efficient. 2863 S = "T"; 2864 2865 // Encode result type. 2866 // GCC has some special rules regarding encoding of properties which 2867 // closely resembles encoding of ivars. 2868 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2869 true /* outermost type */, 2870 true /* encoding for property */); 2871 2872 if (PD->isReadOnly()) { 2873 S += ",R"; 2874 } else { 2875 switch (PD->getSetterKind()) { 2876 case ObjCPropertyDecl::Assign: break; 2877 case ObjCPropertyDecl::Copy: S += ",C"; break; 2878 case ObjCPropertyDecl::Retain: S += ",&"; break; 2879 } 2880 } 2881 2882 // It really isn't clear at all what this means, since properties 2883 // are "dynamic by default". 2884 if (Dynamic) 2885 S += ",D"; 2886 2887 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2888 S += ",N"; 2889 2890 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2891 S += ",G"; 2892 S += PD->getGetterName().getAsString(); 2893 } 2894 2895 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2896 S += ",S"; 2897 S += PD->getSetterName().getAsString(); 2898 } 2899 2900 if (SynthesizePID) { 2901 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2902 S += ",V"; 2903 S += OID->getNameAsString(); 2904 } 2905 2906 // FIXME: OBJCGC: weak & strong 2907} 2908 2909/// getLegacyIntegralTypeEncoding - 2910/// Another legacy compatibility encoding: 32-bit longs are encoded as 2911/// 'l' or 'L' , but not always. For typedefs, we need to use 2912/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2913/// 2914void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2915 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 2916 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 2917 if (BT->getKind() == BuiltinType::ULong && 2918 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2919 PointeeTy = UnsignedIntTy; 2920 else 2921 if (BT->getKind() == BuiltinType::Long && 2922 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2923 PointeeTy = IntTy; 2924 } 2925 } 2926} 2927 2928void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2929 const FieldDecl *Field) { 2930 // We follow the behavior of gcc, expanding structures which are 2931 // directly pointed to, and expanding embedded structures. Note that 2932 // these rules are sufficient to prevent recursive encoding of the 2933 // same type. 2934 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2935 true /* outermost type */); 2936} 2937 2938static void EncodeBitField(const ASTContext *Context, std::string& S, 2939 const FieldDecl *FD) { 2940 const Expr *E = FD->getBitWidth(); 2941 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2942 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2943 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2944 S += 'b'; 2945 S += llvm::utostr(N); 2946} 2947 2948void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2949 bool ExpandPointedToStructures, 2950 bool ExpandStructures, 2951 const FieldDecl *FD, 2952 bool OutermostType, 2953 bool EncodingProperty) { 2954 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 2955 if (FD && FD->isBitField()) 2956 return EncodeBitField(this, S, FD); 2957 char encoding; 2958 switch (BT->getKind()) { 2959 default: assert(0 && "Unhandled builtin type kind"); 2960 case BuiltinType::Void: encoding = 'v'; break; 2961 case BuiltinType::Bool: encoding = 'B'; break; 2962 case BuiltinType::Char_U: 2963 case BuiltinType::UChar: encoding = 'C'; break; 2964 case BuiltinType::UShort: encoding = 'S'; break; 2965 case BuiltinType::UInt: encoding = 'I'; break; 2966 case BuiltinType::ULong: 2967 encoding = 2968 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2969 break; 2970 case BuiltinType::UInt128: encoding = 'T'; break; 2971 case BuiltinType::ULongLong: encoding = 'Q'; break; 2972 case BuiltinType::Char_S: 2973 case BuiltinType::SChar: encoding = 'c'; break; 2974 case BuiltinType::Short: encoding = 's'; break; 2975 case BuiltinType::Int: encoding = 'i'; break; 2976 case BuiltinType::Long: 2977 encoding = 2978 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2979 break; 2980 case BuiltinType::LongLong: encoding = 'q'; break; 2981 case BuiltinType::Int128: encoding = 't'; break; 2982 case BuiltinType::Float: encoding = 'f'; break; 2983 case BuiltinType::Double: encoding = 'd'; break; 2984 case BuiltinType::LongDouble: encoding = 'd'; break; 2985 } 2986 2987 S += encoding; 2988 return; 2989 } 2990 2991 if (const ComplexType *CT = T->getAs<ComplexType>()) { 2992 S += 'j'; 2993 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2994 false); 2995 return; 2996 } 2997 2998 if (const PointerType *PT = T->getAs<PointerType>()) { 2999 QualType PointeeTy = PT->getPointeeType(); 3000 bool isReadOnly = false; 3001 // For historical/compatibility reasons, the read-only qualifier of the 3002 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3003 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3004 // Also, do not emit the 'r' for anything but the outermost type! 3005 if (isa<TypedefType>(T.getTypePtr())) { 3006 if (OutermostType && T.isConstQualified()) { 3007 isReadOnly = true; 3008 S += 'r'; 3009 } 3010 } else if (OutermostType) { 3011 QualType P = PointeeTy; 3012 while (P->getAs<PointerType>()) 3013 P = P->getAs<PointerType>()->getPointeeType(); 3014 if (P.isConstQualified()) { 3015 isReadOnly = true; 3016 S += 'r'; 3017 } 3018 } 3019 if (isReadOnly) { 3020 // Another legacy compatibility encoding. Some ObjC qualifier and type 3021 // combinations need to be rearranged. 3022 // Rewrite "in const" from "nr" to "rn" 3023 const char * s = S.c_str(); 3024 int len = S.length(); 3025 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3026 std::string replace = "rn"; 3027 S.replace(S.end()-2, S.end(), replace); 3028 } 3029 } 3030 if (isObjCSelType(PointeeTy)) { 3031 S += ':'; 3032 return; 3033 } 3034 3035 if (PointeeTy->isCharType()) { 3036 // char pointer types should be encoded as '*' unless it is a 3037 // type that has been typedef'd to 'BOOL'. 3038 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3039 S += '*'; 3040 return; 3041 } 3042 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3043 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3044 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3045 S += '#'; 3046 return; 3047 } 3048 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3049 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3050 S += '@'; 3051 return; 3052 } 3053 // fall through... 3054 } 3055 S += '^'; 3056 getLegacyIntegralTypeEncoding(PointeeTy); 3057 3058 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3059 NULL); 3060 return; 3061 } 3062 3063 if (const ArrayType *AT = 3064 // Ignore type qualifiers etc. 3065 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3066 if (isa<IncompleteArrayType>(AT)) { 3067 // Incomplete arrays are encoded as a pointer to the array element. 3068 S += '^'; 3069 3070 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3071 false, ExpandStructures, FD); 3072 } else { 3073 S += '['; 3074 3075 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3076 S += llvm::utostr(CAT->getSize().getZExtValue()); 3077 else { 3078 //Variable length arrays are encoded as a regular array with 0 elements. 3079 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3080 S += '0'; 3081 } 3082 3083 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3084 false, ExpandStructures, FD); 3085 S += ']'; 3086 } 3087 return; 3088 } 3089 3090 if (T->getAs<FunctionType>()) { 3091 S += '?'; 3092 return; 3093 } 3094 3095 if (const RecordType *RTy = T->getAs<RecordType>()) { 3096 RecordDecl *RDecl = RTy->getDecl(); 3097 S += RDecl->isUnion() ? '(' : '{'; 3098 // Anonymous structures print as '?' 3099 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3100 S += II->getName(); 3101 } else { 3102 S += '?'; 3103 } 3104 if (ExpandStructures) { 3105 S += '='; 3106 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3107 FieldEnd = RDecl->field_end(); 3108 Field != FieldEnd; ++Field) { 3109 if (FD) { 3110 S += '"'; 3111 S += Field->getNameAsString(); 3112 S += '"'; 3113 } 3114 3115 // Special case bit-fields. 3116 if (Field->isBitField()) { 3117 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3118 (*Field)); 3119 } else { 3120 QualType qt = Field->getType(); 3121 getLegacyIntegralTypeEncoding(qt); 3122 getObjCEncodingForTypeImpl(qt, S, false, true, 3123 FD); 3124 } 3125 } 3126 } 3127 S += RDecl->isUnion() ? ')' : '}'; 3128 return; 3129 } 3130 3131 if (T->isEnumeralType()) { 3132 if (FD && FD->isBitField()) 3133 EncodeBitField(this, S, FD); 3134 else 3135 S += 'i'; 3136 return; 3137 } 3138 3139 if (T->isBlockPointerType()) { 3140 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3141 return; 3142 } 3143 3144 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3145 // @encode(class_name) 3146 ObjCInterfaceDecl *OI = OIT->getDecl(); 3147 S += '{'; 3148 const IdentifierInfo *II = OI->getIdentifier(); 3149 S += II->getName(); 3150 S += '='; 3151 llvm::SmallVector<FieldDecl*, 32> RecFields; 3152 CollectObjCIvars(OI, RecFields); 3153 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3154 if (RecFields[i]->isBitField()) 3155 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3156 RecFields[i]); 3157 else 3158 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3159 FD); 3160 } 3161 S += '}'; 3162 return; 3163 } 3164 3165 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3166 if (OPT->isObjCIdType()) { 3167 S += '@'; 3168 return; 3169 } 3170 3171 if (OPT->isObjCClassType()) { 3172 S += '#'; 3173 return; 3174 } 3175 3176 if (OPT->isObjCQualifiedIdType()) { 3177 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3178 ExpandPointedToStructures, 3179 ExpandStructures, FD); 3180 if (FD || EncodingProperty) { 3181 // Note that we do extended encoding of protocol qualifer list 3182 // Only when doing ivar or property encoding. 3183 S += '"'; 3184 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3185 E = OPT->qual_end(); I != E; ++I) { 3186 S += '<'; 3187 S += (*I)->getNameAsString(); 3188 S += '>'; 3189 } 3190 S += '"'; 3191 } 3192 return; 3193 } 3194 3195 QualType PointeeTy = OPT->getPointeeType(); 3196 if (!EncodingProperty && 3197 isa<TypedefType>(PointeeTy.getTypePtr())) { 3198 // Another historical/compatibility reason. 3199 // We encode the underlying type which comes out as 3200 // {...}; 3201 S += '^'; 3202 getObjCEncodingForTypeImpl(PointeeTy, S, 3203 false, ExpandPointedToStructures, 3204 NULL); 3205 return; 3206 } 3207 3208 S += '@'; 3209 if (FD || EncodingProperty) { 3210 S += '"'; 3211 S += OPT->getInterfaceDecl()->getNameAsCString(); 3212 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3213 E = OPT->qual_end(); I != E; ++I) { 3214 S += '<'; 3215 S += (*I)->getNameAsString(); 3216 S += '>'; 3217 } 3218 S += '"'; 3219 } 3220 return; 3221 } 3222 3223 assert(0 && "@encode for type not implemented!"); 3224} 3225 3226void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3227 std::string& S) const { 3228 if (QT & Decl::OBJC_TQ_In) 3229 S += 'n'; 3230 if (QT & Decl::OBJC_TQ_Inout) 3231 S += 'N'; 3232 if (QT & Decl::OBJC_TQ_Out) 3233 S += 'o'; 3234 if (QT & Decl::OBJC_TQ_Bycopy) 3235 S += 'O'; 3236 if (QT & Decl::OBJC_TQ_Byref) 3237 S += 'R'; 3238 if (QT & Decl::OBJC_TQ_Oneway) 3239 S += 'V'; 3240} 3241 3242void ASTContext::setBuiltinVaListType(QualType T) { 3243 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3244 3245 BuiltinVaListType = T; 3246} 3247 3248void ASTContext::setObjCIdType(QualType T) { 3249 ObjCIdTypedefType = T; 3250} 3251 3252void ASTContext::setObjCSelType(QualType T) { 3253 ObjCSelType = T; 3254 3255 const TypedefType *TT = T->getAs<TypedefType>(); 3256 if (!TT) 3257 return; 3258 TypedefDecl *TD = TT->getDecl(); 3259 3260 // typedef struct objc_selector *SEL; 3261 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3262 if (!ptr) 3263 return; 3264 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3265 if (!rec) 3266 return; 3267 SelStructType = rec; 3268} 3269 3270void ASTContext::setObjCProtoType(QualType QT) { 3271 ObjCProtoType = QT; 3272} 3273 3274void ASTContext::setObjCClassType(QualType T) { 3275 ObjCClassTypedefType = T; 3276} 3277 3278void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3279 assert(ObjCConstantStringType.isNull() && 3280 "'NSConstantString' type already set!"); 3281 3282 ObjCConstantStringType = getObjCInterfaceType(Decl); 3283} 3284 3285/// \brief Retrieve the template name that represents a qualified 3286/// template name such as \c std::vector. 3287TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3288 bool TemplateKeyword, 3289 TemplateDecl *Template) { 3290 llvm::FoldingSetNodeID ID; 3291 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3292 3293 void *InsertPos = 0; 3294 QualifiedTemplateName *QTN = 3295 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3296 if (!QTN) { 3297 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3298 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3299 } 3300 3301 return TemplateName(QTN); 3302} 3303 3304/// \brief Retrieve the template name that represents a qualified 3305/// template name such as \c std::vector. 3306TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3307 bool TemplateKeyword, 3308 OverloadedFunctionDecl *Template) { 3309 llvm::FoldingSetNodeID ID; 3310 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3311 3312 void *InsertPos = 0; 3313 QualifiedTemplateName *QTN = 3314 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3315 if (!QTN) { 3316 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3317 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3318 } 3319 3320 return TemplateName(QTN); 3321} 3322 3323/// \brief Retrieve the template name that represents a dependent 3324/// template name such as \c MetaFun::template apply. 3325TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3326 const IdentifierInfo *Name) { 3327 assert((!NNS || NNS->isDependent()) && 3328 "Nested name specifier must be dependent"); 3329 3330 llvm::FoldingSetNodeID ID; 3331 DependentTemplateName::Profile(ID, NNS, Name); 3332 3333 void *InsertPos = 0; 3334 DependentTemplateName *QTN = 3335 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3336 3337 if (QTN) 3338 return TemplateName(QTN); 3339 3340 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3341 if (CanonNNS == NNS) { 3342 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3343 } else { 3344 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3345 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3346 } 3347 3348 DependentTemplateNames.InsertNode(QTN, InsertPos); 3349 return TemplateName(QTN); 3350} 3351 3352/// getFromTargetType - Given one of the integer types provided by 3353/// TargetInfo, produce the corresponding type. The unsigned @p Type 3354/// is actually a value of type @c TargetInfo::IntType. 3355QualType ASTContext::getFromTargetType(unsigned Type) const { 3356 switch (Type) { 3357 case TargetInfo::NoInt: return QualType(); 3358 case TargetInfo::SignedShort: return ShortTy; 3359 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3360 case TargetInfo::SignedInt: return IntTy; 3361 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3362 case TargetInfo::SignedLong: return LongTy; 3363 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3364 case TargetInfo::SignedLongLong: return LongLongTy; 3365 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3366 } 3367 3368 assert(false && "Unhandled TargetInfo::IntType value"); 3369 return QualType(); 3370} 3371 3372//===----------------------------------------------------------------------===// 3373// Type Predicates. 3374//===----------------------------------------------------------------------===// 3375 3376/// isObjCNSObjectType - Return true if this is an NSObject object using 3377/// NSObject attribute on a c-style pointer type. 3378/// FIXME - Make it work directly on types. 3379/// FIXME: Move to Type. 3380/// 3381bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3382 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3383 if (TypedefDecl *TD = TDT->getDecl()) 3384 if (TD->getAttr<ObjCNSObjectAttr>()) 3385 return true; 3386 } 3387 return false; 3388} 3389 3390/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3391/// garbage collection attribute. 3392/// 3393Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3394 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3395 if (getLangOptions().ObjC1 && 3396 getLangOptions().getGCMode() != LangOptions::NonGC) { 3397 GCAttrs = Ty.getObjCGCAttr(); 3398 // Default behavious under objective-c's gc is for objective-c pointers 3399 // (or pointers to them) be treated as though they were declared 3400 // as __strong. 3401 if (GCAttrs == Qualifiers::GCNone) { 3402 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3403 GCAttrs = Qualifiers::Strong; 3404 else if (Ty->isPointerType()) 3405 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3406 } 3407 // Non-pointers have none gc'able attribute regardless of the attribute 3408 // set on them. 3409 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3410 return Qualifiers::GCNone; 3411 } 3412 return GCAttrs; 3413} 3414 3415//===----------------------------------------------------------------------===// 3416// Type Compatibility Testing 3417//===----------------------------------------------------------------------===// 3418 3419/// areCompatVectorTypes - Return true if the two specified vector types are 3420/// compatible. 3421static bool areCompatVectorTypes(const VectorType *LHS, 3422 const VectorType *RHS) { 3423 assert(LHS->isCanonical() && RHS->isCanonical()); 3424 return LHS->getElementType() == RHS->getElementType() && 3425 LHS->getNumElements() == RHS->getNumElements(); 3426} 3427 3428//===----------------------------------------------------------------------===// 3429// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3430//===----------------------------------------------------------------------===// 3431 3432/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3433/// inheritance hierarchy of 'rProto'. 3434bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3435 ObjCProtocolDecl *rProto) { 3436 if (lProto == rProto) 3437 return true; 3438 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3439 E = rProto->protocol_end(); PI != E; ++PI) 3440 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3441 return true; 3442 return false; 3443} 3444 3445/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3446/// return true if lhs's protocols conform to rhs's protocol; false 3447/// otherwise. 3448bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3449 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3450 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3451 return false; 3452} 3453 3454/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3455/// ObjCQualifiedIDType. 3456bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3457 bool compare) { 3458 // Allow id<P..> and an 'id' or void* type in all cases. 3459 if (lhs->isVoidPointerType() || 3460 lhs->isObjCIdType() || lhs->isObjCClassType()) 3461 return true; 3462 else if (rhs->isVoidPointerType() || 3463 rhs->isObjCIdType() || rhs->isObjCClassType()) 3464 return true; 3465 3466 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3467 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3468 3469 if (!rhsOPT) return false; 3470 3471 if (rhsOPT->qual_empty()) { 3472 // If the RHS is a unqualified interface pointer "NSString*", 3473 // make sure we check the class hierarchy. 3474 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3475 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3476 E = lhsQID->qual_end(); I != E; ++I) { 3477 // when comparing an id<P> on lhs with a static type on rhs, 3478 // see if static class implements all of id's protocols, directly or 3479 // through its super class and categories. 3480 if (!rhsID->ClassImplementsProtocol(*I, true)) 3481 return false; 3482 } 3483 } 3484 // If there are no qualifiers and no interface, we have an 'id'. 3485 return true; 3486 } 3487 // Both the right and left sides have qualifiers. 3488 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3489 E = lhsQID->qual_end(); I != E; ++I) { 3490 ObjCProtocolDecl *lhsProto = *I; 3491 bool match = false; 3492 3493 // when comparing an id<P> on lhs with a static type on rhs, 3494 // see if static class implements all of id's protocols, directly or 3495 // through its super class and categories. 3496 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3497 E = rhsOPT->qual_end(); J != E; ++J) { 3498 ObjCProtocolDecl *rhsProto = *J; 3499 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3500 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3501 match = true; 3502 break; 3503 } 3504 } 3505 // If the RHS is a qualified interface pointer "NSString<P>*", 3506 // make sure we check the class hierarchy. 3507 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3508 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3509 E = lhsQID->qual_end(); I != E; ++I) { 3510 // when comparing an id<P> on lhs with a static type on rhs, 3511 // see if static class implements all of id's protocols, directly or 3512 // through its super class and categories. 3513 if (rhsID->ClassImplementsProtocol(*I, true)) { 3514 match = true; 3515 break; 3516 } 3517 } 3518 } 3519 if (!match) 3520 return false; 3521 } 3522 3523 return true; 3524 } 3525 3526 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3527 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3528 3529 if (const ObjCObjectPointerType *lhsOPT = 3530 lhs->getAsObjCInterfacePointerType()) { 3531 if (lhsOPT->qual_empty()) { 3532 bool match = false; 3533 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3534 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3535 E = rhsQID->qual_end(); I != E; ++I) { 3536 // when comparing an id<P> on lhs with a static type on rhs, 3537 // see if static class implements all of id's protocols, directly or 3538 // through its super class and categories. 3539 if (lhsID->ClassImplementsProtocol(*I, true)) { 3540 match = true; 3541 break; 3542 } 3543 } 3544 if (!match) 3545 return false; 3546 } 3547 return true; 3548 } 3549 // Both the right and left sides have qualifiers. 3550 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3551 E = lhsOPT->qual_end(); I != E; ++I) { 3552 ObjCProtocolDecl *lhsProto = *I; 3553 bool match = false; 3554 3555 // when comparing an id<P> on lhs with a static type on rhs, 3556 // see if static class implements all of id's protocols, directly or 3557 // through its super class and categories. 3558 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3559 E = rhsQID->qual_end(); J != E; ++J) { 3560 ObjCProtocolDecl *rhsProto = *J; 3561 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3562 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3563 match = true; 3564 break; 3565 } 3566 } 3567 if (!match) 3568 return false; 3569 } 3570 return true; 3571 } 3572 return false; 3573} 3574 3575/// canAssignObjCInterfaces - Return true if the two interface types are 3576/// compatible for assignment from RHS to LHS. This handles validation of any 3577/// protocol qualifiers on the LHS or RHS. 3578/// 3579bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3580 const ObjCObjectPointerType *RHSOPT) { 3581 // If either type represents the built-in 'id' or 'Class' types, return true. 3582 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3583 return true; 3584 3585 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3586 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3587 QualType(RHSOPT,0), 3588 false); 3589 3590 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3591 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3592 if (LHS && RHS) // We have 2 user-defined types. 3593 return canAssignObjCInterfaces(LHS, RHS); 3594 3595 return false; 3596} 3597 3598bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3599 const ObjCInterfaceType *RHS) { 3600 // Verify that the base decls are compatible: the RHS must be a subclass of 3601 // the LHS. 3602 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3603 return false; 3604 3605 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3606 // protocol qualified at all, then we are good. 3607 if (LHS->getNumProtocols() == 0) 3608 return true; 3609 3610 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3611 // isn't a superset. 3612 if (RHS->getNumProtocols() == 0) 3613 return true; // FIXME: should return false! 3614 3615 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3616 LHSPE = LHS->qual_end(); 3617 LHSPI != LHSPE; LHSPI++) { 3618 bool RHSImplementsProtocol = false; 3619 3620 // If the RHS doesn't implement the protocol on the left, the types 3621 // are incompatible. 3622 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3623 RHSPE = RHS->qual_end(); 3624 RHSPI != RHSPE; RHSPI++) { 3625 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3626 RHSImplementsProtocol = true; 3627 break; 3628 } 3629 } 3630 // FIXME: For better diagnostics, consider passing back the protocol name. 3631 if (!RHSImplementsProtocol) 3632 return false; 3633 } 3634 // The RHS implements all protocols listed on the LHS. 3635 return true; 3636} 3637 3638bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3639 // get the "pointed to" types 3640 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 3641 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 3642 3643 if (!LHSOPT || !RHSOPT) 3644 return false; 3645 3646 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3647 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3648} 3649 3650/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3651/// both shall have the identically qualified version of a compatible type. 3652/// C99 6.2.7p1: Two types have compatible types if their types are the 3653/// same. See 6.7.[2,3,5] for additional rules. 3654bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3655 return !mergeTypes(LHS, RHS).isNull(); 3656} 3657 3658QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3659 const FunctionType *lbase = lhs->getAs<FunctionType>(); 3660 const FunctionType *rbase = rhs->getAs<FunctionType>(); 3661 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3662 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3663 bool allLTypes = true; 3664 bool allRTypes = true; 3665 3666 // Check return type 3667 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3668 if (retType.isNull()) return QualType(); 3669 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3670 allLTypes = false; 3671 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3672 allRTypes = false; 3673 // FIXME: double check this 3674 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 3675 if (NoReturn != lbase->getNoReturnAttr()) 3676 allLTypes = false; 3677 if (NoReturn != rbase->getNoReturnAttr()) 3678 allRTypes = false; 3679 3680 if (lproto && rproto) { // two C99 style function prototypes 3681 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3682 "C++ shouldn't be here"); 3683 unsigned lproto_nargs = lproto->getNumArgs(); 3684 unsigned rproto_nargs = rproto->getNumArgs(); 3685 3686 // Compatible functions must have the same number of arguments 3687 if (lproto_nargs != rproto_nargs) 3688 return QualType(); 3689 3690 // Variadic and non-variadic functions aren't compatible 3691 if (lproto->isVariadic() != rproto->isVariadic()) 3692 return QualType(); 3693 3694 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3695 return QualType(); 3696 3697 // Check argument compatibility 3698 llvm::SmallVector<QualType, 10> types; 3699 for (unsigned i = 0; i < lproto_nargs; i++) { 3700 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3701 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3702 QualType argtype = mergeTypes(largtype, rargtype); 3703 if (argtype.isNull()) return QualType(); 3704 types.push_back(argtype); 3705 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3706 allLTypes = false; 3707 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3708 allRTypes = false; 3709 } 3710 if (allLTypes) return lhs; 3711 if (allRTypes) return rhs; 3712 return getFunctionType(retType, types.begin(), types.size(), 3713 lproto->isVariadic(), lproto->getTypeQuals(), 3714 NoReturn); 3715 } 3716 3717 if (lproto) allRTypes = false; 3718 if (rproto) allLTypes = false; 3719 3720 const FunctionProtoType *proto = lproto ? lproto : rproto; 3721 if (proto) { 3722 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3723 if (proto->isVariadic()) return QualType(); 3724 // Check that the types are compatible with the types that 3725 // would result from default argument promotions (C99 6.7.5.3p15). 3726 // The only types actually affected are promotable integer 3727 // types and floats, which would be passed as a different 3728 // type depending on whether the prototype is visible. 3729 unsigned proto_nargs = proto->getNumArgs(); 3730 for (unsigned i = 0; i < proto_nargs; ++i) { 3731 QualType argTy = proto->getArgType(i); 3732 if (argTy->isPromotableIntegerType() || 3733 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3734 return QualType(); 3735 } 3736 3737 if (allLTypes) return lhs; 3738 if (allRTypes) return rhs; 3739 return getFunctionType(retType, proto->arg_type_begin(), 3740 proto->getNumArgs(), proto->isVariadic(), 3741 proto->getTypeQuals(), NoReturn); 3742 } 3743 3744 if (allLTypes) return lhs; 3745 if (allRTypes) return rhs; 3746 return getFunctionNoProtoType(retType, NoReturn); 3747} 3748 3749QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3750 // C++ [expr]: If an expression initially has the type "reference to T", the 3751 // type is adjusted to "T" prior to any further analysis, the expression 3752 // designates the object or function denoted by the reference, and the 3753 // expression is an lvalue unless the reference is an rvalue reference and 3754 // the expression is a function call (possibly inside parentheses). 3755 // FIXME: C++ shouldn't be going through here! The rules are different 3756 // enough that they should be handled separately. 3757 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3758 // shouldn't be going through here! 3759 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 3760 LHS = RT->getPointeeType(); 3761 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 3762 RHS = RT->getPointeeType(); 3763 3764 QualType LHSCan = getCanonicalType(LHS), 3765 RHSCan = getCanonicalType(RHS); 3766 3767 // If two types are identical, they are compatible. 3768 if (LHSCan == RHSCan) 3769 return LHS; 3770 3771 // If the qualifiers are different, the types aren't compatible... mostly. 3772 Qualifiers LQuals = LHSCan.getQualifiers(); 3773 Qualifiers RQuals = RHSCan.getQualifiers(); 3774 if (LQuals != RQuals) { 3775 // If any of these qualifiers are different, we have a type 3776 // mismatch. 3777 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 3778 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 3779 return QualType(); 3780 3781 // Exactly one GC qualifier difference is allowed: __strong is 3782 // okay if the other type has no GC qualifier but is an Objective 3783 // C object pointer (i.e. implicitly strong by default). We fix 3784 // this by pretending that the unqualified type was actually 3785 // qualified __strong. 3786 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 3787 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 3788 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 3789 3790 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 3791 return QualType(); 3792 3793 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 3794 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 3795 } 3796 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 3797 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 3798 } 3799 return QualType(); 3800 } 3801 3802 // Okay, qualifiers are equal. 3803 3804 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3805 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3806 3807 // We want to consider the two function types to be the same for these 3808 // comparisons, just force one to the other. 3809 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3810 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3811 3812 // Same as above for arrays 3813 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3814 LHSClass = Type::ConstantArray; 3815 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3816 RHSClass = Type::ConstantArray; 3817 3818 // Canonicalize ExtVector -> Vector. 3819 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3820 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3821 3822 // If the canonical type classes don't match. 3823 if (LHSClass != RHSClass) { 3824 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3825 // a signed integer type, or an unsigned integer type. 3826 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 3827 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3828 return RHS; 3829 } 3830 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 3831 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3832 return LHS; 3833 } 3834 3835 return QualType(); 3836 } 3837 3838 // The canonical type classes match. 3839 switch (LHSClass) { 3840#define TYPE(Class, Base) 3841#define ABSTRACT_TYPE(Class, Base) 3842#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3843#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3844#include "clang/AST/TypeNodes.def" 3845 assert(false && "Non-canonical and dependent types shouldn't get here"); 3846 return QualType(); 3847 3848 case Type::LValueReference: 3849 case Type::RValueReference: 3850 case Type::MemberPointer: 3851 assert(false && "C++ should never be in mergeTypes"); 3852 return QualType(); 3853 3854 case Type::IncompleteArray: 3855 case Type::VariableArray: 3856 case Type::FunctionProto: 3857 case Type::ExtVector: 3858 assert(false && "Types are eliminated above"); 3859 return QualType(); 3860 3861 case Type::Pointer: 3862 { 3863 // Merge two pointer types, while trying to preserve typedef info 3864 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 3865 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 3866 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3867 if (ResultType.isNull()) return QualType(); 3868 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3869 return LHS; 3870 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3871 return RHS; 3872 return getPointerType(ResultType); 3873 } 3874 case Type::BlockPointer: 3875 { 3876 // Merge two block pointer types, while trying to preserve typedef info 3877 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 3878 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 3879 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3880 if (ResultType.isNull()) return QualType(); 3881 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3882 return LHS; 3883 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3884 return RHS; 3885 return getBlockPointerType(ResultType); 3886 } 3887 case Type::ConstantArray: 3888 { 3889 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3890 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3891 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3892 return QualType(); 3893 3894 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3895 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3896 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3897 if (ResultType.isNull()) return QualType(); 3898 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3899 return LHS; 3900 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3901 return RHS; 3902 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3903 ArrayType::ArraySizeModifier(), 0); 3904 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3905 ArrayType::ArraySizeModifier(), 0); 3906 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3907 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3908 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3909 return LHS; 3910 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3911 return RHS; 3912 if (LVAT) { 3913 // FIXME: This isn't correct! But tricky to implement because 3914 // the array's size has to be the size of LHS, but the type 3915 // has to be different. 3916 return LHS; 3917 } 3918 if (RVAT) { 3919 // FIXME: This isn't correct! But tricky to implement because 3920 // the array's size has to be the size of RHS, but the type 3921 // has to be different. 3922 return RHS; 3923 } 3924 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3925 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3926 return getIncompleteArrayType(ResultType, 3927 ArrayType::ArraySizeModifier(), 0); 3928 } 3929 case Type::FunctionNoProto: 3930 return mergeFunctionTypes(LHS, RHS); 3931 case Type::Record: 3932 case Type::Enum: 3933 return QualType(); 3934 case Type::Builtin: 3935 // Only exactly equal builtin types are compatible, which is tested above. 3936 return QualType(); 3937 case Type::Complex: 3938 // Distinct complex types are incompatible. 3939 return QualType(); 3940 case Type::Vector: 3941 // FIXME: The merged type should be an ExtVector! 3942 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 3943 return LHS; 3944 return QualType(); 3945 case Type::ObjCInterface: { 3946 // Check if the interfaces are assignment compatible. 3947 // FIXME: This should be type compatibility, e.g. whether 3948 // "LHS x; RHS x;" at global scope is legal. 3949 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 3950 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 3951 if (LHSIface && RHSIface && 3952 canAssignObjCInterfaces(LHSIface, RHSIface)) 3953 return LHS; 3954 3955 return QualType(); 3956 } 3957 case Type::ObjCObjectPointer: { 3958 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 3959 RHS->getAs<ObjCObjectPointerType>())) 3960 return LHS; 3961 3962 return QualType(); 3963 } 3964 case Type::FixedWidthInt: 3965 // Distinct fixed-width integers are not compatible. 3966 return QualType(); 3967 case Type::TemplateSpecialization: 3968 assert(false && "Dependent types have no size"); 3969 break; 3970 } 3971 3972 return QualType(); 3973} 3974 3975//===----------------------------------------------------------------------===// 3976// Integer Predicates 3977//===----------------------------------------------------------------------===// 3978 3979unsigned ASTContext::getIntWidth(QualType T) { 3980 if (T == BoolTy) 3981 return 1; 3982 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3983 return FWIT->getWidth(); 3984 } 3985 // For builtin types, just use the standard type sizing method 3986 return (unsigned)getTypeSize(T); 3987} 3988 3989QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3990 assert(T->isSignedIntegerType() && "Unexpected type"); 3991 if (const EnumType* ETy = T->getAs<EnumType>()) 3992 T = ETy->getDecl()->getIntegerType(); 3993 const BuiltinType* BTy = T->getAs<BuiltinType>(); 3994 assert (BTy && "Unexpected signed integer type"); 3995 switch (BTy->getKind()) { 3996 case BuiltinType::Char_S: 3997 case BuiltinType::SChar: 3998 return UnsignedCharTy; 3999 case BuiltinType::Short: 4000 return UnsignedShortTy; 4001 case BuiltinType::Int: 4002 return UnsignedIntTy; 4003 case BuiltinType::Long: 4004 return UnsignedLongTy; 4005 case BuiltinType::LongLong: 4006 return UnsignedLongLongTy; 4007 case BuiltinType::Int128: 4008 return UnsignedInt128Ty; 4009 default: 4010 assert(0 && "Unexpected signed integer type"); 4011 return QualType(); 4012 } 4013} 4014 4015ExternalASTSource::~ExternalASTSource() { } 4016 4017void ExternalASTSource::PrintStats() { } 4018 4019 4020//===----------------------------------------------------------------------===// 4021// Builtin Type Computation 4022//===----------------------------------------------------------------------===// 4023 4024/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4025/// pointer over the consumed characters. This returns the resultant type. 4026static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4027 ASTContext::GetBuiltinTypeError &Error, 4028 bool AllowTypeModifiers = true) { 4029 // Modifiers. 4030 int HowLong = 0; 4031 bool Signed = false, Unsigned = false; 4032 4033 // Read the modifiers first. 4034 bool Done = false; 4035 while (!Done) { 4036 switch (*Str++) { 4037 default: Done = true; --Str; break; 4038 case 'S': 4039 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4040 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4041 Signed = true; 4042 break; 4043 case 'U': 4044 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4045 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4046 Unsigned = true; 4047 break; 4048 case 'L': 4049 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4050 ++HowLong; 4051 break; 4052 } 4053 } 4054 4055 QualType Type; 4056 4057 // Read the base type. 4058 switch (*Str++) { 4059 default: assert(0 && "Unknown builtin type letter!"); 4060 case 'v': 4061 assert(HowLong == 0 && !Signed && !Unsigned && 4062 "Bad modifiers used with 'v'!"); 4063 Type = Context.VoidTy; 4064 break; 4065 case 'f': 4066 assert(HowLong == 0 && !Signed && !Unsigned && 4067 "Bad modifiers used with 'f'!"); 4068 Type = Context.FloatTy; 4069 break; 4070 case 'd': 4071 assert(HowLong < 2 && !Signed && !Unsigned && 4072 "Bad modifiers used with 'd'!"); 4073 if (HowLong) 4074 Type = Context.LongDoubleTy; 4075 else 4076 Type = Context.DoubleTy; 4077 break; 4078 case 's': 4079 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4080 if (Unsigned) 4081 Type = Context.UnsignedShortTy; 4082 else 4083 Type = Context.ShortTy; 4084 break; 4085 case 'i': 4086 if (HowLong == 3) 4087 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4088 else if (HowLong == 2) 4089 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4090 else if (HowLong == 1) 4091 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4092 else 4093 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4094 break; 4095 case 'c': 4096 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4097 if (Signed) 4098 Type = Context.SignedCharTy; 4099 else if (Unsigned) 4100 Type = Context.UnsignedCharTy; 4101 else 4102 Type = Context.CharTy; 4103 break; 4104 case 'b': // boolean 4105 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4106 Type = Context.BoolTy; 4107 break; 4108 case 'z': // size_t. 4109 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4110 Type = Context.getSizeType(); 4111 break; 4112 case 'F': 4113 Type = Context.getCFConstantStringType(); 4114 break; 4115 case 'a': 4116 Type = Context.getBuiltinVaListType(); 4117 assert(!Type.isNull() && "builtin va list type not initialized!"); 4118 break; 4119 case 'A': 4120 // This is a "reference" to a va_list; however, what exactly 4121 // this means depends on how va_list is defined. There are two 4122 // different kinds of va_list: ones passed by value, and ones 4123 // passed by reference. An example of a by-value va_list is 4124 // x86, where va_list is a char*. An example of by-ref va_list 4125 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4126 // we want this argument to be a char*&; for x86-64, we want 4127 // it to be a __va_list_tag*. 4128 Type = Context.getBuiltinVaListType(); 4129 assert(!Type.isNull() && "builtin va list type not initialized!"); 4130 if (Type->isArrayType()) { 4131 Type = Context.getArrayDecayedType(Type); 4132 } else { 4133 Type = Context.getLValueReferenceType(Type); 4134 } 4135 break; 4136 case 'V': { 4137 char *End; 4138 unsigned NumElements = strtoul(Str, &End, 10); 4139 assert(End != Str && "Missing vector size"); 4140 4141 Str = End; 4142 4143 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4144 Type = Context.getVectorType(ElementType, NumElements); 4145 break; 4146 } 4147 case 'X': { 4148 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4149 Type = Context.getComplexType(ElementType); 4150 break; 4151 } 4152 case 'P': 4153 Type = Context.getFILEType(); 4154 if (Type.isNull()) { 4155 Error = ASTContext::GE_Missing_stdio; 4156 return QualType(); 4157 } 4158 break; 4159 case 'J': 4160 if (Signed) 4161 Type = Context.getsigjmp_bufType(); 4162 else 4163 Type = Context.getjmp_bufType(); 4164 4165 if (Type.isNull()) { 4166 Error = ASTContext::GE_Missing_setjmp; 4167 return QualType(); 4168 } 4169 break; 4170 } 4171 4172 if (!AllowTypeModifiers) 4173 return Type; 4174 4175 Done = false; 4176 while (!Done) { 4177 switch (*Str++) { 4178 default: Done = true; --Str; break; 4179 case '*': 4180 Type = Context.getPointerType(Type); 4181 break; 4182 case '&': 4183 Type = Context.getLValueReferenceType(Type); 4184 break; 4185 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4186 case 'C': 4187 Type = Type.withConst(); 4188 break; 4189 } 4190 } 4191 4192 return Type; 4193} 4194 4195/// GetBuiltinType - Return the type for the specified builtin. 4196QualType ASTContext::GetBuiltinType(unsigned id, 4197 GetBuiltinTypeError &Error) { 4198 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4199 4200 llvm::SmallVector<QualType, 8> ArgTypes; 4201 4202 Error = GE_None; 4203 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4204 if (Error != GE_None) 4205 return QualType(); 4206 while (TypeStr[0] && TypeStr[0] != '.') { 4207 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4208 if (Error != GE_None) 4209 return QualType(); 4210 4211 // Do array -> pointer decay. The builtin should use the decayed type. 4212 if (Ty->isArrayType()) 4213 Ty = getArrayDecayedType(Ty); 4214 4215 ArgTypes.push_back(Ty); 4216 } 4217 4218 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4219 "'.' should only occur at end of builtin type list!"); 4220 4221 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4222 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4223 return getFunctionNoProtoType(ResType); 4224 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4225 TypeStr[0] == '.', 0); 4226} 4227 4228QualType 4229ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4230 // Perform the usual unary conversions. We do this early so that 4231 // integral promotions to "int" can allow us to exit early, in the 4232 // lhs == rhs check. Also, for conversion purposes, we ignore any 4233 // qualifiers. For example, "const float" and "float" are 4234 // equivalent. 4235 if (lhs->isPromotableIntegerType()) 4236 lhs = getPromotedIntegerType(lhs); 4237 else 4238 lhs = lhs.getUnqualifiedType(); 4239 if (rhs->isPromotableIntegerType()) 4240 rhs = getPromotedIntegerType(rhs); 4241 else 4242 rhs = rhs.getUnqualifiedType(); 4243 4244 // If both types are identical, no conversion is needed. 4245 if (lhs == rhs) 4246 return lhs; 4247 4248 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4249 // The caller can deal with this (e.g. pointer + int). 4250 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4251 return lhs; 4252 4253 // At this point, we have two different arithmetic types. 4254 4255 // Handle complex types first (C99 6.3.1.8p1). 4256 if (lhs->isComplexType() || rhs->isComplexType()) { 4257 // if we have an integer operand, the result is the complex type. 4258 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4259 // convert the rhs to the lhs complex type. 4260 return lhs; 4261 } 4262 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4263 // convert the lhs to the rhs complex type. 4264 return rhs; 4265 } 4266 // This handles complex/complex, complex/float, or float/complex. 4267 // When both operands are complex, the shorter operand is converted to the 4268 // type of the longer, and that is the type of the result. This corresponds 4269 // to what is done when combining two real floating-point operands. 4270 // The fun begins when size promotion occur across type domains. 4271 // From H&S 6.3.4: When one operand is complex and the other is a real 4272 // floating-point type, the less precise type is converted, within it's 4273 // real or complex domain, to the precision of the other type. For example, 4274 // when combining a "long double" with a "double _Complex", the 4275 // "double _Complex" is promoted to "long double _Complex". 4276 int result = getFloatingTypeOrder(lhs, rhs); 4277 4278 if (result > 0) { // The left side is bigger, convert rhs. 4279 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4280 } else if (result < 0) { // The right side is bigger, convert lhs. 4281 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4282 } 4283 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4284 // domains match. This is a requirement for our implementation, C99 4285 // does not require this promotion. 4286 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4287 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4288 return rhs; 4289 } else { // handle "_Complex double, double". 4290 return lhs; 4291 } 4292 } 4293 return lhs; // The domain/size match exactly. 4294 } 4295 // Now handle "real" floating types (i.e. float, double, long double). 4296 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4297 // if we have an integer operand, the result is the real floating type. 4298 if (rhs->isIntegerType()) { 4299 // convert rhs to the lhs floating point type. 4300 return lhs; 4301 } 4302 if (rhs->isComplexIntegerType()) { 4303 // convert rhs to the complex floating point type. 4304 return getComplexType(lhs); 4305 } 4306 if (lhs->isIntegerType()) { 4307 // convert lhs to the rhs floating point type. 4308 return rhs; 4309 } 4310 if (lhs->isComplexIntegerType()) { 4311 // convert lhs to the complex floating point type. 4312 return getComplexType(rhs); 4313 } 4314 // We have two real floating types, float/complex combos were handled above. 4315 // Convert the smaller operand to the bigger result. 4316 int result = getFloatingTypeOrder(lhs, rhs); 4317 if (result > 0) // convert the rhs 4318 return lhs; 4319 assert(result < 0 && "illegal float comparison"); 4320 return rhs; // convert the lhs 4321 } 4322 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4323 // Handle GCC complex int extension. 4324 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4325 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4326 4327 if (lhsComplexInt && rhsComplexInt) { 4328 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4329 rhsComplexInt->getElementType()) >= 0) 4330 return lhs; // convert the rhs 4331 return rhs; 4332 } else if (lhsComplexInt && rhs->isIntegerType()) { 4333 // convert the rhs to the lhs complex type. 4334 return lhs; 4335 } else if (rhsComplexInt && lhs->isIntegerType()) { 4336 // convert the lhs to the rhs complex type. 4337 return rhs; 4338 } 4339 } 4340 // Finally, we have two differing integer types. 4341 // The rules for this case are in C99 6.3.1.8 4342 int compare = getIntegerTypeOrder(lhs, rhs); 4343 bool lhsSigned = lhs->isSignedIntegerType(), 4344 rhsSigned = rhs->isSignedIntegerType(); 4345 QualType destType; 4346 if (lhsSigned == rhsSigned) { 4347 // Same signedness; use the higher-ranked type 4348 destType = compare >= 0 ? lhs : rhs; 4349 } else if (compare != (lhsSigned ? 1 : -1)) { 4350 // The unsigned type has greater than or equal rank to the 4351 // signed type, so use the unsigned type 4352 destType = lhsSigned ? rhs : lhs; 4353 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4354 // The two types are different widths; if we are here, that 4355 // means the signed type is larger than the unsigned type, so 4356 // use the signed type. 4357 destType = lhsSigned ? lhs : rhs; 4358 } else { 4359 // The signed type is higher-ranked than the unsigned type, 4360 // but isn't actually any bigger (like unsigned int and long 4361 // on most 32-bit systems). Use the unsigned type corresponding 4362 // to the signed type. 4363 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4364 } 4365 return destType; 4366} 4367