ASTContext.cpp revision bdc601b196c48d4cd56a5ceb45d41ae4e87371ab
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/CharUnits.h" 16#include "clang/AST/DeclCXX.h" 17#include "clang/AST/DeclObjC.h" 18#include "clang/AST/DeclTemplate.h" 19#include "clang/AST/TypeLoc.h" 20#include "clang/AST/Expr.h" 21#include "clang/AST/ExternalASTSource.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/Basic/Builtins.h" 24#include "clang/Basic/SourceManager.h" 25#include "clang/Basic/TargetInfo.h" 26#include "llvm/ADT/SmallString.h" 27#include "llvm/ADT/StringExtras.h" 28#include "llvm/Support/MathExtras.h" 29#include "llvm/Support/raw_ostream.h" 30#include "RecordLayoutBuilder.h" 31 32using namespace clang; 33 34enum FloatingRank { 35 FloatRank, DoubleRank, LongDoubleRank 36}; 37 38ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 39 const TargetInfo &t, 40 IdentifierTable &idents, SelectorTable &sels, 41 Builtin::Context &builtins, 42 bool FreeMem, unsigned size_reserve) : 43 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 44 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 45 sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0), 46 SourceMgr(SM), LangOpts(LOpts), 47 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 48 Idents(idents), Selectors(sels), 49 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 50 ObjCIdRedefinitionType = QualType(); 51 ObjCClassRedefinitionType = QualType(); 52 ObjCSelRedefinitionType = QualType(); 53 if (size_reserve > 0) Types.reserve(size_reserve); 54 TUDecl = TranslationUnitDecl::Create(*this); 55 InitBuiltinTypes(); 56} 57 58ASTContext::~ASTContext() { 59 // Deallocate all the types. 60 while (!Types.empty()) { 61 Types.back()->Destroy(*this); 62 Types.pop_back(); 63 } 64 65 { 66 llvm::FoldingSet<ExtQuals>::iterator 67 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); 68 while (I != E) 69 Deallocate(&*I++); 70 } 71 72 { 73 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 74 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 75 while (I != E) { 76 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 77 delete R; 78 } 79 } 80 81 { 82 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 83 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 84 while (I != E) { 85 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 86 delete R; 87 } 88 } 89 90 // Destroy nested-name-specifiers. 91 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 92 NNS = NestedNameSpecifiers.begin(), 93 NNSEnd = NestedNameSpecifiers.end(); 94 NNS != NNSEnd; 95 /* Increment in loop */) 96 (*NNS++).Destroy(*this); 97 98 if (GlobalNestedNameSpecifier) 99 GlobalNestedNameSpecifier->Destroy(*this); 100 101 TUDecl->Destroy(*this); 102} 103 104void 105ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 106 ExternalSource.reset(Source.take()); 107} 108 109void ASTContext::PrintStats() const { 110 fprintf(stderr, "*** AST Context Stats:\n"); 111 fprintf(stderr, " %d types total.\n", (int)Types.size()); 112 113 unsigned counts[] = { 114#define TYPE(Name, Parent) 0, 115#define ABSTRACT_TYPE(Name, Parent) 116#include "clang/AST/TypeNodes.def" 117 0 // Extra 118 }; 119 120 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 121 Type *T = Types[i]; 122 counts[(unsigned)T->getTypeClass()]++; 123 } 124 125 unsigned Idx = 0; 126 unsigned TotalBytes = 0; 127#define TYPE(Name, Parent) \ 128 if (counts[Idx]) \ 129 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 130 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 131 ++Idx; 132#define ABSTRACT_TYPE(Name, Parent) 133#include "clang/AST/TypeNodes.def" 134 135 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 136 137 if (ExternalSource.get()) { 138 fprintf(stderr, "\n"); 139 ExternalSource->PrintStats(); 140 } 141} 142 143 144void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 145 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 146 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 147 Types.push_back(Ty); 148} 149 150void ASTContext::InitBuiltinTypes() { 151 assert(VoidTy.isNull() && "Context reinitialized?"); 152 153 // C99 6.2.5p19. 154 InitBuiltinType(VoidTy, BuiltinType::Void); 155 156 // C99 6.2.5p2. 157 InitBuiltinType(BoolTy, BuiltinType::Bool); 158 // C99 6.2.5p3. 159 if (LangOpts.CharIsSigned) 160 InitBuiltinType(CharTy, BuiltinType::Char_S); 161 else 162 InitBuiltinType(CharTy, BuiltinType::Char_U); 163 // C99 6.2.5p4. 164 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 165 InitBuiltinType(ShortTy, BuiltinType::Short); 166 InitBuiltinType(IntTy, BuiltinType::Int); 167 InitBuiltinType(LongTy, BuiltinType::Long); 168 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 169 170 // C99 6.2.5p6. 171 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 172 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 173 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 174 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 175 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 176 177 // C99 6.2.5p10. 178 InitBuiltinType(FloatTy, BuiltinType::Float); 179 InitBuiltinType(DoubleTy, BuiltinType::Double); 180 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 181 182 // GNU extension, 128-bit integers. 183 InitBuiltinType(Int128Ty, BuiltinType::Int128); 184 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 185 186 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 187 InitBuiltinType(WCharTy, BuiltinType::WChar); 188 else // C99 189 WCharTy = getFromTargetType(Target.getWCharType()); 190 191 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 192 InitBuiltinType(Char16Ty, BuiltinType::Char16); 193 else // C99 194 Char16Ty = getFromTargetType(Target.getChar16Type()); 195 196 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 197 InitBuiltinType(Char32Ty, BuiltinType::Char32); 198 else // C99 199 Char32Ty = getFromTargetType(Target.getChar32Type()); 200 201 // Placeholder type for functions. 202 InitBuiltinType(OverloadTy, BuiltinType::Overload); 203 204 // Placeholder type for type-dependent expressions whose type is 205 // completely unknown. No code should ever check a type against 206 // DependentTy and users should never see it; however, it is here to 207 // help diagnose failures to properly check for type-dependent 208 // expressions. 209 InitBuiltinType(DependentTy, BuiltinType::Dependent); 210 211 // Placeholder type for C++0x auto declarations whose real type has 212 // not yet been deduced. 213 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 214 215 // C99 6.2.5p11. 216 FloatComplexTy = getComplexType(FloatTy); 217 DoubleComplexTy = getComplexType(DoubleTy); 218 LongDoubleComplexTy = getComplexType(LongDoubleTy); 219 220 BuiltinVaListType = QualType(); 221 222 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 223 ObjCIdTypedefType = QualType(); 224 ObjCClassTypedefType = QualType(); 225 ObjCSelTypedefType = QualType(); 226 227 // Builtin types for 'id', 'Class', and 'SEL'. 228 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 229 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 230 InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel); 231 232 ObjCConstantStringType = QualType(); 233 234 // void * type 235 VoidPtrTy = getPointerType(VoidTy); 236 237 // nullptr type (C++0x 2.14.7) 238 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 239} 240 241MemberSpecializationInfo * 242ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 243 assert(Var->isStaticDataMember() && "Not a static data member"); 244 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 245 = InstantiatedFromStaticDataMember.find(Var); 246 if (Pos == InstantiatedFromStaticDataMember.end()) 247 return 0; 248 249 return Pos->second; 250} 251 252void 253ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 254 TemplateSpecializationKind TSK) { 255 assert(Inst->isStaticDataMember() && "Not a static data member"); 256 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 257 assert(!InstantiatedFromStaticDataMember[Inst] && 258 "Already noted what static data member was instantiated from"); 259 InstantiatedFromStaticDataMember[Inst] 260 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 261} 262 263NamedDecl * 264ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) { 265 llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos 266 = InstantiatedFromUsingDecl.find(UUD); 267 if (Pos == InstantiatedFromUsingDecl.end()) 268 return 0; 269 270 return Pos->second; 271} 272 273void 274ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) { 275 assert((isa<UsingDecl>(Pattern) || 276 isa<UnresolvedUsingValueDecl>(Pattern) || 277 isa<UnresolvedUsingTypenameDecl>(Pattern)) && 278 "pattern decl is not a using decl"); 279 assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists"); 280 InstantiatedFromUsingDecl[Inst] = Pattern; 281} 282 283UsingShadowDecl * 284ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) { 285 llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos 286 = InstantiatedFromUsingShadowDecl.find(Inst); 287 if (Pos == InstantiatedFromUsingShadowDecl.end()) 288 return 0; 289 290 return Pos->second; 291} 292 293void 294ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst, 295 UsingShadowDecl *Pattern) { 296 assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists"); 297 InstantiatedFromUsingShadowDecl[Inst] = Pattern; 298} 299 300FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 301 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 302 = InstantiatedFromUnnamedFieldDecl.find(Field); 303 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 304 return 0; 305 306 return Pos->second; 307} 308 309void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 310 FieldDecl *Tmpl) { 311 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 312 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 313 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 314 "Already noted what unnamed field was instantiated from"); 315 316 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 317} 318 319namespace { 320 class BeforeInTranslationUnit 321 : std::binary_function<SourceRange, SourceRange, bool> { 322 SourceManager *SourceMgr; 323 324 public: 325 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 326 327 bool operator()(SourceRange X, SourceRange Y) { 328 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 329 } 330 }; 331} 332 333/// \brief Determine whether the given comment is a Doxygen-style comment. 334/// 335/// \param Start the start of the comment text. 336/// 337/// \param End the end of the comment text. 338/// 339/// \param Member whether we want to check whether this is a member comment 340/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 341/// we only return true when we find a non-member comment. 342static bool 343isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 344 bool Member = false) { 345 const char *BufferStart 346 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 347 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 348 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 349 350 if (End - Start < 4) 351 return false; 352 353 assert(Start[0] == '/' && "Not a comment?"); 354 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 355 return false; 356 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 357 return false; 358 359 return (Start[3] == '<') == Member; 360} 361 362/// \brief Retrieve the comment associated with the given declaration, if 363/// it has one. 364const char *ASTContext::getCommentForDecl(const Decl *D) { 365 if (!D) 366 return 0; 367 368 // Check whether we have cached a comment string for this declaration 369 // already. 370 llvm::DenseMap<const Decl *, std::string>::iterator Pos 371 = DeclComments.find(D); 372 if (Pos != DeclComments.end()) 373 return Pos->second.c_str(); 374 375 // If we have an external AST source and have not yet loaded comments from 376 // that source, do so now. 377 if (ExternalSource && !LoadedExternalComments) { 378 std::vector<SourceRange> LoadedComments; 379 ExternalSource->ReadComments(LoadedComments); 380 381 if (!LoadedComments.empty()) 382 Comments.insert(Comments.begin(), LoadedComments.begin(), 383 LoadedComments.end()); 384 385 LoadedExternalComments = true; 386 } 387 388 // If there are no comments anywhere, we won't find anything. 389 if (Comments.empty()) 390 return 0; 391 392 // If the declaration doesn't map directly to a location in a file, we 393 // can't find the comment. 394 SourceLocation DeclStartLoc = D->getLocStart(); 395 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 396 return 0; 397 398 // Find the comment that occurs just before this declaration. 399 std::vector<SourceRange>::iterator LastComment 400 = std::lower_bound(Comments.begin(), Comments.end(), 401 SourceRange(DeclStartLoc), 402 BeforeInTranslationUnit(&SourceMgr)); 403 404 // Decompose the location for the start of the declaration and find the 405 // beginning of the file buffer. 406 std::pair<FileID, unsigned> DeclStartDecomp 407 = SourceMgr.getDecomposedLoc(DeclStartLoc); 408 const char *FileBufferStart 409 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 410 411 // First check whether we have a comment for a member. 412 if (LastComment != Comments.end() && 413 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 414 isDoxygenComment(SourceMgr, *LastComment, true)) { 415 std::pair<FileID, unsigned> LastCommentEndDecomp 416 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 417 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 418 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 419 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 420 LastCommentEndDecomp.second)) { 421 // The Doxygen member comment comes after the declaration starts and 422 // is on the same line and in the same file as the declaration. This 423 // is the comment we want. 424 std::string &Result = DeclComments[D]; 425 Result.append(FileBufferStart + 426 SourceMgr.getFileOffset(LastComment->getBegin()), 427 FileBufferStart + LastCommentEndDecomp.second + 1); 428 return Result.c_str(); 429 } 430 } 431 432 if (LastComment == Comments.begin()) 433 return 0; 434 --LastComment; 435 436 // Decompose the end of the comment. 437 std::pair<FileID, unsigned> LastCommentEndDecomp 438 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 439 440 // If the comment and the declaration aren't in the same file, then they 441 // aren't related. 442 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 443 return 0; 444 445 // Check that we actually have a Doxygen comment. 446 if (!isDoxygenComment(SourceMgr, *LastComment)) 447 return 0; 448 449 // Compute the starting line for the declaration and for the end of the 450 // comment (this is expensive). 451 unsigned DeclStartLine 452 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 453 unsigned CommentEndLine 454 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 455 LastCommentEndDecomp.second); 456 457 // If the comment does not end on the line prior to the declaration, then 458 // the comment is not associated with the declaration at all. 459 if (CommentEndLine + 1 != DeclStartLine) 460 return 0; 461 462 // We have a comment, but there may be more comments on the previous lines. 463 // Keep looking so long as the comments are still Doxygen comments and are 464 // still adjacent. 465 unsigned ExpectedLine 466 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 467 std::vector<SourceRange>::iterator FirstComment = LastComment; 468 while (FirstComment != Comments.begin()) { 469 // Look at the previous comment 470 --FirstComment; 471 std::pair<FileID, unsigned> Decomp 472 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 473 474 // If this previous comment is in a different file, we're done. 475 if (Decomp.first != DeclStartDecomp.first) { 476 ++FirstComment; 477 break; 478 } 479 480 // If this comment is not a Doxygen comment, we're done. 481 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 482 ++FirstComment; 483 break; 484 } 485 486 // If the line number is not what we expected, we're done. 487 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 488 if (Line != ExpectedLine) { 489 ++FirstComment; 490 break; 491 } 492 493 // Set the next expected line number. 494 ExpectedLine 495 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 496 } 497 498 // The iterator range [FirstComment, LastComment] contains all of the 499 // BCPL comments that, together, are associated with this declaration. 500 // Form a single comment block string for this declaration that concatenates 501 // all of these comments. 502 std::string &Result = DeclComments[D]; 503 while (FirstComment != LastComment) { 504 std::pair<FileID, unsigned> DecompStart 505 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 506 std::pair<FileID, unsigned> DecompEnd 507 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 508 Result.append(FileBufferStart + DecompStart.second, 509 FileBufferStart + DecompEnd.second + 1); 510 ++FirstComment; 511 } 512 513 // Append the last comment line. 514 Result.append(FileBufferStart + 515 SourceMgr.getFileOffset(LastComment->getBegin()), 516 FileBufferStart + LastCommentEndDecomp.second + 1); 517 return Result.c_str(); 518} 519 520//===----------------------------------------------------------------------===// 521// Type Sizing and Analysis 522//===----------------------------------------------------------------------===// 523 524/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 525/// scalar floating point type. 526const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 527 const BuiltinType *BT = T->getAs<BuiltinType>(); 528 assert(BT && "Not a floating point type!"); 529 switch (BT->getKind()) { 530 default: assert(0 && "Not a floating point type!"); 531 case BuiltinType::Float: return Target.getFloatFormat(); 532 case BuiltinType::Double: return Target.getDoubleFormat(); 533 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 534 } 535} 536 537/// getDeclAlignInBytes - Return a conservative estimate of the alignment of the 538/// specified decl. Note that bitfields do not have a valid alignment, so 539/// this method will assert on them. 540/// If @p RefAsPointee, references are treated like their underlying type 541/// (for alignof), else they're treated like pointers (for CodeGen). 542unsigned ASTContext::getDeclAlignInBytes(const Decl *D, bool RefAsPointee) { 543 unsigned Align = Target.getCharWidth(); 544 545 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 546 Align = std::max(Align, AA->getMaxAlignment()); 547 548 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 549 QualType T = VD->getType(); 550 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 551 if (RefAsPointee) 552 T = RT->getPointeeType(); 553 else 554 T = getPointerType(RT->getPointeeType()); 555 } 556 if (!T->isIncompleteType() && !T->isFunctionType()) { 557 // Incomplete or function types default to 1. 558 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 559 T = cast<ArrayType>(T)->getElementType(); 560 561 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 562 } 563 } 564 565 return Align / Target.getCharWidth(); 566} 567 568/// getTypeSize - Return the size of the specified type, in bits. This method 569/// does not work on incomplete types. 570/// 571/// FIXME: Pointers into different addr spaces could have different sizes and 572/// alignment requirements: getPointerInfo should take an AddrSpace, this 573/// should take a QualType, &c. 574std::pair<uint64_t, unsigned> 575ASTContext::getTypeInfo(const Type *T) { 576 uint64_t Width=0; 577 unsigned Align=8; 578 switch (T->getTypeClass()) { 579#define TYPE(Class, Base) 580#define ABSTRACT_TYPE(Class, Base) 581#define NON_CANONICAL_TYPE(Class, Base) 582#define DEPENDENT_TYPE(Class, Base) case Type::Class: 583#include "clang/AST/TypeNodes.def" 584 assert(false && "Should not see dependent types"); 585 break; 586 587 case Type::FunctionNoProto: 588 case Type::FunctionProto: 589 // GCC extension: alignof(function) = 32 bits 590 Width = 0; 591 Align = 32; 592 break; 593 594 case Type::IncompleteArray: 595 case Type::VariableArray: 596 Width = 0; 597 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 598 break; 599 600 case Type::ConstantArray: { 601 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 602 603 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 604 Width = EltInfo.first*CAT->getSize().getZExtValue(); 605 Align = EltInfo.second; 606 break; 607 } 608 case Type::ExtVector: 609 case Type::Vector: { 610 const VectorType *VT = cast<VectorType>(T); 611 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 612 Width = EltInfo.first*VT->getNumElements(); 613 Align = Width; 614 // If the alignment is not a power of 2, round up to the next power of 2. 615 // This happens for non-power-of-2 length vectors. 616 if (VT->getNumElements() & (VT->getNumElements()-1)) { 617 Align = llvm::NextPowerOf2(Align); 618 Width = llvm::RoundUpToAlignment(Width, Align); 619 } 620 break; 621 } 622 623 case Type::Builtin: 624 switch (cast<BuiltinType>(T)->getKind()) { 625 default: assert(0 && "Unknown builtin type!"); 626 case BuiltinType::Void: 627 // GCC extension: alignof(void) = 8 bits. 628 Width = 0; 629 Align = 8; 630 break; 631 632 case BuiltinType::Bool: 633 Width = Target.getBoolWidth(); 634 Align = Target.getBoolAlign(); 635 break; 636 case BuiltinType::Char_S: 637 case BuiltinType::Char_U: 638 case BuiltinType::UChar: 639 case BuiltinType::SChar: 640 Width = Target.getCharWidth(); 641 Align = Target.getCharAlign(); 642 break; 643 case BuiltinType::WChar: 644 Width = Target.getWCharWidth(); 645 Align = Target.getWCharAlign(); 646 break; 647 case BuiltinType::Char16: 648 Width = Target.getChar16Width(); 649 Align = Target.getChar16Align(); 650 break; 651 case BuiltinType::Char32: 652 Width = Target.getChar32Width(); 653 Align = Target.getChar32Align(); 654 break; 655 case BuiltinType::UShort: 656 case BuiltinType::Short: 657 Width = Target.getShortWidth(); 658 Align = Target.getShortAlign(); 659 break; 660 case BuiltinType::UInt: 661 case BuiltinType::Int: 662 Width = Target.getIntWidth(); 663 Align = Target.getIntAlign(); 664 break; 665 case BuiltinType::ULong: 666 case BuiltinType::Long: 667 Width = Target.getLongWidth(); 668 Align = Target.getLongAlign(); 669 break; 670 case BuiltinType::ULongLong: 671 case BuiltinType::LongLong: 672 Width = Target.getLongLongWidth(); 673 Align = Target.getLongLongAlign(); 674 break; 675 case BuiltinType::Int128: 676 case BuiltinType::UInt128: 677 Width = 128; 678 Align = 128; // int128_t is 128-bit aligned on all targets. 679 break; 680 case BuiltinType::Float: 681 Width = Target.getFloatWidth(); 682 Align = Target.getFloatAlign(); 683 break; 684 case BuiltinType::Double: 685 Width = Target.getDoubleWidth(); 686 Align = Target.getDoubleAlign(); 687 break; 688 case BuiltinType::LongDouble: 689 Width = Target.getLongDoubleWidth(); 690 Align = Target.getLongDoubleAlign(); 691 break; 692 case BuiltinType::NullPtr: 693 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 694 Align = Target.getPointerAlign(0); // == sizeof(void*) 695 break; 696 } 697 break; 698 case Type::FixedWidthInt: 699 // FIXME: This isn't precisely correct; the width/alignment should depend 700 // on the available types for the target 701 Width = cast<FixedWidthIntType>(T)->getWidth(); 702 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 703 Align = Width; 704 break; 705 case Type::ObjCObjectPointer: 706 Width = Target.getPointerWidth(0); 707 Align = Target.getPointerAlign(0); 708 break; 709 case Type::BlockPointer: { 710 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 711 Width = Target.getPointerWidth(AS); 712 Align = Target.getPointerAlign(AS); 713 break; 714 } 715 case Type::LValueReference: 716 case Type::RValueReference: { 717 // alignof and sizeof should never enter this code path here, so we go 718 // the pointer route. 719 unsigned AS = cast<ReferenceType>(T)->getPointeeType().getAddressSpace(); 720 Width = Target.getPointerWidth(AS); 721 Align = Target.getPointerAlign(AS); 722 break; 723 } 724 case Type::Pointer: { 725 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 726 Width = Target.getPointerWidth(AS); 727 Align = Target.getPointerAlign(AS); 728 break; 729 } 730 case Type::MemberPointer: { 731 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 732 std::pair<uint64_t, unsigned> PtrDiffInfo = 733 getTypeInfo(getPointerDiffType()); 734 Width = PtrDiffInfo.first; 735 if (Pointee->isFunctionType()) 736 Width *= 2; 737 Align = PtrDiffInfo.second; 738 break; 739 } 740 case Type::Complex: { 741 // Complex types have the same alignment as their elements, but twice the 742 // size. 743 std::pair<uint64_t, unsigned> EltInfo = 744 getTypeInfo(cast<ComplexType>(T)->getElementType()); 745 Width = EltInfo.first*2; 746 Align = EltInfo.second; 747 break; 748 } 749 case Type::ObjCInterface: { 750 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 751 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 752 Width = Layout.getSize(); 753 Align = Layout.getAlignment(); 754 break; 755 } 756 case Type::Record: 757 case Type::Enum: { 758 const TagType *TT = cast<TagType>(T); 759 760 if (TT->getDecl()->isInvalidDecl()) { 761 Width = 1; 762 Align = 1; 763 break; 764 } 765 766 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 767 return getTypeInfo(ET->getDecl()->getIntegerType()); 768 769 const RecordType *RT = cast<RecordType>(TT); 770 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 771 Width = Layout.getSize(); 772 Align = Layout.getAlignment(); 773 break; 774 } 775 776 case Type::SubstTemplateTypeParm: 777 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 778 getReplacementType().getTypePtr()); 779 780 case Type::Elaborated: 781 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType() 782 .getTypePtr()); 783 784 case Type::Typedef: { 785 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 786 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 787 Align = std::max(Aligned->getMaxAlignment(), 788 getTypeAlign(Typedef->getUnderlyingType().getTypePtr())); 789 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 790 } else 791 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 792 break; 793 } 794 795 case Type::TypeOfExpr: 796 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 797 .getTypePtr()); 798 799 case Type::TypeOf: 800 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 801 802 case Type::Decltype: 803 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 804 .getTypePtr()); 805 806 case Type::QualifiedName: 807 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 808 809 case Type::TemplateSpecialization: 810 assert(getCanonicalType(T) != T && 811 "Cannot request the size of a dependent type"); 812 // FIXME: this is likely to be wrong once we support template 813 // aliases, since a template alias could refer to a typedef that 814 // has an __aligned__ attribute on it. 815 return getTypeInfo(getCanonicalType(T)); 816 } 817 818 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 819 return std::make_pair(Width, Align); 820} 821 822/// getTypeSizeInChars - Return the size of the specified type, in characters. 823/// This method does not work on incomplete types. 824CharUnits ASTContext::getTypeSizeInChars(QualType T) { 825 return CharUnits::fromRaw(getTypeSize(T) / getCharWidth()); 826} 827CharUnits ASTContext::getTypeSizeInChars(const Type *T) { 828 return CharUnits::fromRaw(getTypeSize(T) / getCharWidth()); 829} 830 831/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 832/// type for the current target in bits. This can be different than the ABI 833/// alignment in cases where it is beneficial for performance to overalign 834/// a data type. 835unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 836 unsigned ABIAlign = getTypeAlign(T); 837 838 // Double and long long should be naturally aligned if possible. 839 if (const ComplexType* CT = T->getAs<ComplexType>()) 840 T = CT->getElementType().getTypePtr(); 841 if (T->isSpecificBuiltinType(BuiltinType::Double) || 842 T->isSpecificBuiltinType(BuiltinType::LongLong)) 843 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 844 845 return ABIAlign; 846} 847 848static void CollectLocalObjCIvars(ASTContext *Ctx, 849 const ObjCInterfaceDecl *OI, 850 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 851 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 852 E = OI->ivar_end(); I != E; ++I) { 853 ObjCIvarDecl *IVDecl = *I; 854 if (!IVDecl->isInvalidDecl()) 855 Fields.push_back(cast<FieldDecl>(IVDecl)); 856 } 857} 858 859void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 860 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 861 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 862 CollectObjCIvars(SuperClass, Fields); 863 CollectLocalObjCIvars(this, OI, Fields); 864} 865 866/// ShallowCollectObjCIvars - 867/// Collect all ivars, including those synthesized, in the current class. 868/// 869void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 870 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 871 bool CollectSynthesized) { 872 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 873 E = OI->ivar_end(); I != E; ++I) { 874 Ivars.push_back(*I); 875 } 876 if (CollectSynthesized) 877 CollectSynthesizedIvars(OI, Ivars); 878} 879 880void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 881 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 882 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 883 E = PD->prop_end(); I != E; ++I) 884 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 885 Ivars.push_back(Ivar); 886 887 // Also look into nested protocols. 888 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 889 E = PD->protocol_end(); P != E; ++P) 890 CollectProtocolSynthesizedIvars(*P, Ivars); 891} 892 893/// CollectSynthesizedIvars - 894/// This routine collect synthesized ivars for the designated class. 895/// 896void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 897 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 898 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 899 E = OI->prop_end(); I != E; ++I) { 900 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 901 Ivars.push_back(Ivar); 902 } 903 // Also look into interface's protocol list for properties declared 904 // in the protocol and whose ivars are synthesized. 905 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 906 PE = OI->protocol_end(); P != PE; ++P) { 907 ObjCProtocolDecl *PD = (*P); 908 CollectProtocolSynthesizedIvars(PD, Ivars); 909 } 910} 911 912/// CollectInheritedProtocols - Collect all protocols in current class and 913/// those inherited by it. 914void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 915 llvm::SmallVectorImpl<ObjCProtocolDecl*> &Protocols) { 916 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 917 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 918 PE = OI->protocol_end(); P != PE; ++P) { 919 ObjCProtocolDecl *Proto = (*P); 920 Protocols.push_back(Proto); 921 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 922 PE = Proto->protocol_end(); P != PE; ++P) 923 CollectInheritedProtocols(*P, Protocols); 924 } 925 926 // Categories of this Interface. 927 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 928 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 929 CollectInheritedProtocols(CDeclChain, Protocols); 930 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 931 while (SD) { 932 CollectInheritedProtocols(SD, Protocols); 933 SD = SD->getSuperClass(); 934 } 935 return; 936 } 937 if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 938 for (ObjCInterfaceDecl::protocol_iterator P = OC->protocol_begin(), 939 PE = OC->protocol_end(); P != PE; ++P) { 940 ObjCProtocolDecl *Proto = (*P); 941 Protocols.push_back(Proto); 942 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 943 PE = Proto->protocol_end(); P != PE; ++P) 944 CollectInheritedProtocols(*P, Protocols); 945 } 946 return; 947 } 948 if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 949 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 950 PE = OP->protocol_end(); P != PE; ++P) { 951 ObjCProtocolDecl *Proto = (*P); 952 Protocols.push_back(Proto); 953 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 954 PE = Proto->protocol_end(); P != PE; ++P) 955 CollectInheritedProtocols(*P, Protocols); 956 } 957 return; 958 } 959} 960 961unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 962 unsigned count = 0; 963 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 964 E = PD->prop_end(); I != E; ++I) 965 if ((*I)->getPropertyIvarDecl()) 966 ++count; 967 968 // Also look into nested protocols. 969 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 970 E = PD->protocol_end(); P != E; ++P) 971 count += CountProtocolSynthesizedIvars(*P); 972 return count; 973} 974 975unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) { 976 unsigned count = 0; 977 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 978 E = OI->prop_end(); I != E; ++I) { 979 if ((*I)->getPropertyIvarDecl()) 980 ++count; 981 } 982 // Also look into interface's protocol list for properties declared 983 // in the protocol and whose ivars are synthesized. 984 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 985 PE = OI->protocol_end(); P != PE; ++P) { 986 ObjCProtocolDecl *PD = (*P); 987 count += CountProtocolSynthesizedIvars(PD); 988 } 989 return count; 990} 991 992/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 993ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 994 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 995 I = ObjCImpls.find(D); 996 if (I != ObjCImpls.end()) 997 return cast<ObjCImplementationDecl>(I->second); 998 return 0; 999} 1000/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 1001ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 1002 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 1003 I = ObjCImpls.find(D); 1004 if (I != ObjCImpls.end()) 1005 return cast<ObjCCategoryImplDecl>(I->second); 1006 return 0; 1007} 1008 1009/// \brief Set the implementation of ObjCInterfaceDecl. 1010void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 1011 ObjCImplementationDecl *ImplD) { 1012 assert(IFaceD && ImplD && "Passed null params"); 1013 ObjCImpls[IFaceD] = ImplD; 1014} 1015/// \brief Set the implementation of ObjCCategoryDecl. 1016void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 1017 ObjCCategoryImplDecl *ImplD) { 1018 assert(CatD && ImplD && "Passed null params"); 1019 ObjCImpls[CatD] = ImplD; 1020} 1021 1022/// \brief Allocate an uninitialized TypeSourceInfo. 1023/// 1024/// The caller should initialize the memory held by TypeSourceInfo using 1025/// the TypeLoc wrappers. 1026/// 1027/// \param T the type that will be the basis for type source info. This type 1028/// should refer to how the declarator was written in source code, not to 1029/// what type semantic analysis resolved the declarator to. 1030TypeSourceInfo *ASTContext::CreateTypeSourceInfo(QualType T, 1031 unsigned DataSize) { 1032 if (!DataSize) 1033 DataSize = TypeLoc::getFullDataSizeForType(T); 1034 else 1035 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 1036 "incorrect data size provided to CreateTypeSourceInfo!"); 1037 1038 TypeSourceInfo *TInfo = 1039 (TypeSourceInfo*)BumpAlloc.Allocate(sizeof(TypeSourceInfo) + DataSize, 8); 1040 new (TInfo) TypeSourceInfo(T); 1041 return TInfo; 1042} 1043 1044TypeSourceInfo *ASTContext::getTrivialTypeSourceInfo(QualType T, 1045 SourceLocation L) { 1046 TypeSourceInfo *DI = CreateTypeSourceInfo(T); 1047 DI->getTypeLoc().initialize(L); 1048 return DI; 1049} 1050 1051/// getInterfaceLayoutImpl - Get or compute information about the 1052/// layout of the given interface. 1053/// 1054/// \param Impl - If given, also include the layout of the interface's 1055/// implementation. This may differ by including synthesized ivars. 1056const ASTRecordLayout & 1057ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 1058 const ObjCImplementationDecl *Impl) { 1059 assert(!D->isForwardDecl() && "Invalid interface decl!"); 1060 1061 // Look up this layout, if already laid out, return what we have. 1062 ObjCContainerDecl *Key = 1063 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 1064 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 1065 return *Entry; 1066 1067 // Add in synthesized ivar count if laying out an implementation. 1068 if (Impl) { 1069 unsigned FieldCount = D->ivar_size(); 1070 unsigned SynthCount = CountSynthesizedIvars(D); 1071 FieldCount += SynthCount; 1072 // If there aren't any sythesized ivars then reuse the interface 1073 // entry. Note we can't cache this because we simply free all 1074 // entries later; however we shouldn't look up implementations 1075 // frequently. 1076 if (SynthCount == 0) 1077 return getObjCLayout(D, 0); 1078 } 1079 1080 const ASTRecordLayout *NewEntry = 1081 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 1082 ObjCLayouts[Key] = NewEntry; 1083 1084 return *NewEntry; 1085} 1086 1087const ASTRecordLayout & 1088ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 1089 return getObjCLayout(D, 0); 1090} 1091 1092const ASTRecordLayout & 1093ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 1094 return getObjCLayout(D->getClassInterface(), D); 1095} 1096 1097/// getASTRecordLayout - Get or compute information about the layout of the 1098/// specified record (struct/union/class), which indicates its size and field 1099/// position information. 1100const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 1101 D = D->getDefinition(*this); 1102 assert(D && "Cannot get layout of forward declarations!"); 1103 1104 // Look up this layout, if already laid out, return what we have. 1105 // Note that we can't save a reference to the entry because this function 1106 // is recursive. 1107 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 1108 if (Entry) return *Entry; 1109 1110 const ASTRecordLayout *NewEntry = 1111 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 1112 ASTRecordLayouts[D] = NewEntry; 1113 1114 return *NewEntry; 1115} 1116 1117const CXXMethodDecl *ASTContext::getKeyFunction(const CXXRecordDecl *RD) { 1118 RD = cast<CXXRecordDecl>(RD->getDefinition(*this)); 1119 assert(RD && "Cannot get key function for forward declarations!"); 1120 1121 const CXXMethodDecl *&Entry = KeyFunctions[RD]; 1122 if (!Entry) 1123 Entry = ASTRecordLayoutBuilder::ComputeKeyFunction(RD); 1124 else 1125 assert(Entry == ASTRecordLayoutBuilder::ComputeKeyFunction(RD) && 1126 "Key function changed!"); 1127 1128 return Entry; 1129} 1130 1131//===----------------------------------------------------------------------===// 1132// Type creation/memoization methods 1133//===----------------------------------------------------------------------===// 1134 1135QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1136 unsigned Fast = Quals.getFastQualifiers(); 1137 Quals.removeFastQualifiers(); 1138 1139 // Check if we've already instantiated this type. 1140 llvm::FoldingSetNodeID ID; 1141 ExtQuals::Profile(ID, TypeNode, Quals); 1142 void *InsertPos = 0; 1143 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1144 assert(EQ->getQualifiers() == Quals); 1145 QualType T = QualType(EQ, Fast); 1146 return T; 1147 } 1148 1149 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1150 ExtQualNodes.InsertNode(New, InsertPos); 1151 QualType T = QualType(New, Fast); 1152 return T; 1153} 1154 1155QualType ASTContext::getVolatileType(QualType T) { 1156 QualType CanT = getCanonicalType(T); 1157 if (CanT.isVolatileQualified()) return T; 1158 1159 QualifierCollector Quals; 1160 const Type *TypeNode = Quals.strip(T); 1161 Quals.addVolatile(); 1162 1163 return getExtQualType(TypeNode, Quals); 1164} 1165 1166QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1167 QualType CanT = getCanonicalType(T); 1168 if (CanT.getAddressSpace() == AddressSpace) 1169 return T; 1170 1171 // If we are composing extended qualifiers together, merge together 1172 // into one ExtQuals node. 1173 QualifierCollector Quals; 1174 const Type *TypeNode = Quals.strip(T); 1175 1176 // If this type already has an address space specified, it cannot get 1177 // another one. 1178 assert(!Quals.hasAddressSpace() && 1179 "Type cannot be in multiple addr spaces!"); 1180 Quals.addAddressSpace(AddressSpace); 1181 1182 return getExtQualType(TypeNode, Quals); 1183} 1184 1185QualType ASTContext::getObjCGCQualType(QualType T, 1186 Qualifiers::GC GCAttr) { 1187 QualType CanT = getCanonicalType(T); 1188 if (CanT.getObjCGCAttr() == GCAttr) 1189 return T; 1190 1191 if (T->isPointerType()) { 1192 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1193 if (Pointee->isAnyPointerType()) { 1194 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1195 return getPointerType(ResultType); 1196 } 1197 } 1198 1199 // If we are composing extended qualifiers together, merge together 1200 // into one ExtQuals node. 1201 QualifierCollector Quals; 1202 const Type *TypeNode = Quals.strip(T); 1203 1204 // If this type already has an ObjCGC specified, it cannot get 1205 // another one. 1206 assert(!Quals.hasObjCGCAttr() && 1207 "Type cannot have multiple ObjCGCs!"); 1208 Quals.addObjCGCAttr(GCAttr); 1209 1210 return getExtQualType(TypeNode, Quals); 1211} 1212 1213QualType ASTContext::getNoReturnType(QualType T, bool AddNoReturn) { 1214 QualType ResultType; 1215 if (const PointerType *Pointer = T->getAs<PointerType>()) { 1216 QualType Pointee = Pointer->getPointeeType(); 1217 ResultType = getNoReturnType(Pointee, AddNoReturn); 1218 if (ResultType == Pointee) 1219 return T; 1220 1221 ResultType = getPointerType(ResultType); 1222 } else if (const BlockPointerType *BlockPointer 1223 = T->getAs<BlockPointerType>()) { 1224 QualType Pointee = BlockPointer->getPointeeType(); 1225 ResultType = getNoReturnType(Pointee, AddNoReturn); 1226 if (ResultType == Pointee) 1227 return T; 1228 1229 ResultType = getBlockPointerType(ResultType); 1230 } else if (const FunctionType *F = T->getAs<FunctionType>()) { 1231 if (F->getNoReturnAttr() == AddNoReturn) 1232 return T; 1233 1234 if (const FunctionNoProtoType *FNPT = dyn_cast<FunctionNoProtoType>(F)) { 1235 ResultType = getFunctionNoProtoType(FNPT->getResultType(), AddNoReturn); 1236 } else { 1237 const FunctionProtoType *FPT = cast<FunctionProtoType>(F); 1238 ResultType 1239 = getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 1240 FPT->getNumArgs(), FPT->isVariadic(), 1241 FPT->getTypeQuals(), 1242 FPT->hasExceptionSpec(), FPT->hasAnyExceptionSpec(), 1243 FPT->getNumExceptions(), FPT->exception_begin(), 1244 AddNoReturn); 1245 } 1246 } else 1247 return T; 1248 1249 return getQualifiedType(ResultType, T.getLocalQualifiers()); 1250} 1251 1252/// getComplexType - Return the uniqued reference to the type for a complex 1253/// number with the specified element type. 1254QualType ASTContext::getComplexType(QualType T) { 1255 // Unique pointers, to guarantee there is only one pointer of a particular 1256 // structure. 1257 llvm::FoldingSetNodeID ID; 1258 ComplexType::Profile(ID, T); 1259 1260 void *InsertPos = 0; 1261 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1262 return QualType(CT, 0); 1263 1264 // If the pointee type isn't canonical, this won't be a canonical type either, 1265 // so fill in the canonical type field. 1266 QualType Canonical; 1267 if (!T.isCanonical()) { 1268 Canonical = getComplexType(getCanonicalType(T)); 1269 1270 // Get the new insert position for the node we care about. 1271 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1272 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1273 } 1274 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1275 Types.push_back(New); 1276 ComplexTypes.InsertNode(New, InsertPos); 1277 return QualType(New, 0); 1278} 1279 1280QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1281 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1282 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1283 FixedWidthIntType *&Entry = Map[Width]; 1284 if (!Entry) 1285 Entry = new FixedWidthIntType(Width, Signed); 1286 return QualType(Entry, 0); 1287} 1288 1289/// getPointerType - Return the uniqued reference to the type for a pointer to 1290/// the specified type. 1291QualType ASTContext::getPointerType(QualType T) { 1292 // Unique pointers, to guarantee there is only one pointer of a particular 1293 // structure. 1294 llvm::FoldingSetNodeID ID; 1295 PointerType::Profile(ID, T); 1296 1297 void *InsertPos = 0; 1298 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1299 return QualType(PT, 0); 1300 1301 // If the pointee type isn't canonical, this won't be a canonical type either, 1302 // so fill in the canonical type field. 1303 QualType Canonical; 1304 if (!T.isCanonical()) { 1305 Canonical = getPointerType(getCanonicalType(T)); 1306 1307 // Get the new insert position for the node we care about. 1308 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1309 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1310 } 1311 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1312 Types.push_back(New); 1313 PointerTypes.InsertNode(New, InsertPos); 1314 return QualType(New, 0); 1315} 1316 1317/// getBlockPointerType - Return the uniqued reference to the type for 1318/// a pointer to the specified block. 1319QualType ASTContext::getBlockPointerType(QualType T) { 1320 assert(T->isFunctionType() && "block of function types only"); 1321 // Unique pointers, to guarantee there is only one block of a particular 1322 // structure. 1323 llvm::FoldingSetNodeID ID; 1324 BlockPointerType::Profile(ID, T); 1325 1326 void *InsertPos = 0; 1327 if (BlockPointerType *PT = 1328 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1329 return QualType(PT, 0); 1330 1331 // If the block pointee type isn't canonical, this won't be a canonical 1332 // type either so fill in the canonical type field. 1333 QualType Canonical; 1334 if (!T.isCanonical()) { 1335 Canonical = getBlockPointerType(getCanonicalType(T)); 1336 1337 // Get the new insert position for the node we care about. 1338 BlockPointerType *NewIP = 1339 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1340 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1341 } 1342 BlockPointerType *New 1343 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1344 Types.push_back(New); 1345 BlockPointerTypes.InsertNode(New, InsertPos); 1346 return QualType(New, 0); 1347} 1348 1349/// getLValueReferenceType - Return the uniqued reference to the type for an 1350/// lvalue reference to the specified type. 1351QualType ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) { 1352 // Unique pointers, to guarantee there is only one pointer of a particular 1353 // structure. 1354 llvm::FoldingSetNodeID ID; 1355 ReferenceType::Profile(ID, T, SpelledAsLValue); 1356 1357 void *InsertPos = 0; 1358 if (LValueReferenceType *RT = 1359 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1360 return QualType(RT, 0); 1361 1362 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1363 1364 // If the referencee type isn't canonical, this won't be a canonical type 1365 // either, so fill in the canonical type field. 1366 QualType Canonical; 1367 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1368 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1369 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1370 1371 // Get the new insert position for the node we care about. 1372 LValueReferenceType *NewIP = 1373 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1374 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1375 } 1376 1377 LValueReferenceType *New 1378 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1379 SpelledAsLValue); 1380 Types.push_back(New); 1381 LValueReferenceTypes.InsertNode(New, InsertPos); 1382 1383 return QualType(New, 0); 1384} 1385 1386/// getRValueReferenceType - Return the uniqued reference to the type for an 1387/// rvalue reference to the specified type. 1388QualType ASTContext::getRValueReferenceType(QualType T) { 1389 // Unique pointers, to guarantee there is only one pointer of a particular 1390 // structure. 1391 llvm::FoldingSetNodeID ID; 1392 ReferenceType::Profile(ID, T, false); 1393 1394 void *InsertPos = 0; 1395 if (RValueReferenceType *RT = 1396 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1397 return QualType(RT, 0); 1398 1399 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1400 1401 // If the referencee type isn't canonical, this won't be a canonical type 1402 // either, so fill in the canonical type field. 1403 QualType Canonical; 1404 if (InnerRef || !T.isCanonical()) { 1405 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1406 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1407 1408 // Get the new insert position for the node we care about. 1409 RValueReferenceType *NewIP = 1410 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1411 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1412 } 1413 1414 RValueReferenceType *New 1415 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1416 Types.push_back(New); 1417 RValueReferenceTypes.InsertNode(New, InsertPos); 1418 return QualType(New, 0); 1419} 1420 1421/// getMemberPointerType - Return the uniqued reference to the type for a 1422/// member pointer to the specified type, in the specified class. 1423QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1424 // Unique pointers, to guarantee there is only one pointer of a particular 1425 // structure. 1426 llvm::FoldingSetNodeID ID; 1427 MemberPointerType::Profile(ID, T, Cls); 1428 1429 void *InsertPos = 0; 1430 if (MemberPointerType *PT = 1431 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1432 return QualType(PT, 0); 1433 1434 // If the pointee or class type isn't canonical, this won't be a canonical 1435 // type either, so fill in the canonical type field. 1436 QualType Canonical; 1437 if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) { 1438 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1439 1440 // Get the new insert position for the node we care about. 1441 MemberPointerType *NewIP = 1442 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1443 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1444 } 1445 MemberPointerType *New 1446 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1447 Types.push_back(New); 1448 MemberPointerTypes.InsertNode(New, InsertPos); 1449 return QualType(New, 0); 1450} 1451 1452/// getConstantArrayType - Return the unique reference to the type for an 1453/// array of the specified element type. 1454QualType ASTContext::getConstantArrayType(QualType EltTy, 1455 const llvm::APInt &ArySizeIn, 1456 ArrayType::ArraySizeModifier ASM, 1457 unsigned EltTypeQuals) { 1458 assert((EltTy->isDependentType() || 1459 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1460 "Constant array of VLAs is illegal!"); 1461 1462 // Convert the array size into a canonical width matching the pointer size for 1463 // the target. 1464 llvm::APInt ArySize(ArySizeIn); 1465 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1466 1467 llvm::FoldingSetNodeID ID; 1468 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1469 1470 void *InsertPos = 0; 1471 if (ConstantArrayType *ATP = 1472 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1473 return QualType(ATP, 0); 1474 1475 // If the element type isn't canonical, this won't be a canonical type either, 1476 // so fill in the canonical type field. 1477 QualType Canonical; 1478 if (!EltTy.isCanonical()) { 1479 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1480 ASM, EltTypeQuals); 1481 // Get the new insert position for the node we care about. 1482 ConstantArrayType *NewIP = 1483 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1484 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1485 } 1486 1487 ConstantArrayType *New = new(*this,TypeAlignment) 1488 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1489 ConstantArrayTypes.InsertNode(New, InsertPos); 1490 Types.push_back(New); 1491 return QualType(New, 0); 1492} 1493 1494/// getVariableArrayType - Returns a non-unique reference to the type for a 1495/// variable array of the specified element type. 1496QualType ASTContext::getVariableArrayType(QualType EltTy, 1497 Expr *NumElts, 1498 ArrayType::ArraySizeModifier ASM, 1499 unsigned EltTypeQuals, 1500 SourceRange Brackets) { 1501 // Since we don't unique expressions, it isn't possible to unique VLA's 1502 // that have an expression provided for their size. 1503 1504 VariableArrayType *New = new(*this, TypeAlignment) 1505 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1506 1507 VariableArrayTypes.push_back(New); 1508 Types.push_back(New); 1509 return QualType(New, 0); 1510} 1511 1512/// getDependentSizedArrayType - Returns a non-unique reference to 1513/// the type for a dependently-sized array of the specified element 1514/// type. 1515QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1516 Expr *NumElts, 1517 ArrayType::ArraySizeModifier ASM, 1518 unsigned EltTypeQuals, 1519 SourceRange Brackets) { 1520 assert((!NumElts || NumElts->isTypeDependent() || 1521 NumElts->isValueDependent()) && 1522 "Size must be type- or value-dependent!"); 1523 1524 void *InsertPos = 0; 1525 DependentSizedArrayType *Canon = 0; 1526 1527 if (NumElts) { 1528 // Dependently-sized array types that do not have a specified 1529 // number of elements will have their sizes deduced from an 1530 // initializer. 1531 llvm::FoldingSetNodeID ID; 1532 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1533 EltTypeQuals, NumElts); 1534 1535 Canon = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1536 } 1537 1538 DependentSizedArrayType *New; 1539 if (Canon) { 1540 // We already have a canonical version of this array type; use it as 1541 // the canonical type for a newly-built type. 1542 New = new (*this, TypeAlignment) 1543 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1544 NumElts, ASM, EltTypeQuals, Brackets); 1545 } else { 1546 QualType CanonEltTy = getCanonicalType(EltTy); 1547 if (CanonEltTy == EltTy) { 1548 New = new (*this, TypeAlignment) 1549 DependentSizedArrayType(*this, EltTy, QualType(), 1550 NumElts, ASM, EltTypeQuals, Brackets); 1551 1552 if (NumElts) 1553 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1554 } else { 1555 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1556 ASM, EltTypeQuals, 1557 SourceRange()); 1558 New = new (*this, TypeAlignment) 1559 DependentSizedArrayType(*this, EltTy, Canon, 1560 NumElts, ASM, EltTypeQuals, Brackets); 1561 } 1562 } 1563 1564 Types.push_back(New); 1565 return QualType(New, 0); 1566} 1567 1568QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1569 ArrayType::ArraySizeModifier ASM, 1570 unsigned EltTypeQuals) { 1571 llvm::FoldingSetNodeID ID; 1572 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1573 1574 void *InsertPos = 0; 1575 if (IncompleteArrayType *ATP = 1576 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1577 return QualType(ATP, 0); 1578 1579 // If the element type isn't canonical, this won't be a canonical type 1580 // either, so fill in the canonical type field. 1581 QualType Canonical; 1582 1583 if (!EltTy.isCanonical()) { 1584 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1585 ASM, EltTypeQuals); 1586 1587 // Get the new insert position for the node we care about. 1588 IncompleteArrayType *NewIP = 1589 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1590 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1591 } 1592 1593 IncompleteArrayType *New = new (*this, TypeAlignment) 1594 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1595 1596 IncompleteArrayTypes.InsertNode(New, InsertPos); 1597 Types.push_back(New); 1598 return QualType(New, 0); 1599} 1600 1601/// getVectorType - Return the unique reference to a vector type of 1602/// the specified element type and size. VectorType must be a built-in type. 1603QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1604 BuiltinType *baseType; 1605 1606 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1607 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1608 1609 // Check if we've already instantiated a vector of this type. 1610 llvm::FoldingSetNodeID ID; 1611 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1612 void *InsertPos = 0; 1613 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1614 return QualType(VTP, 0); 1615 1616 // If the element type isn't canonical, this won't be a canonical type either, 1617 // so fill in the canonical type field. 1618 QualType Canonical; 1619 if (!vecType.isCanonical()) { 1620 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1621 1622 // Get the new insert position for the node we care about. 1623 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1624 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1625 } 1626 VectorType *New = new (*this, TypeAlignment) 1627 VectorType(vecType, NumElts, Canonical); 1628 VectorTypes.InsertNode(New, InsertPos); 1629 Types.push_back(New); 1630 return QualType(New, 0); 1631} 1632 1633/// getExtVectorType - Return the unique reference to an extended vector type of 1634/// the specified element type and size. VectorType must be a built-in type. 1635QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1636 BuiltinType *baseType; 1637 1638 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1639 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1640 1641 // Check if we've already instantiated a vector of this type. 1642 llvm::FoldingSetNodeID ID; 1643 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1644 void *InsertPos = 0; 1645 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1646 return QualType(VTP, 0); 1647 1648 // If the element type isn't canonical, this won't be a canonical type either, 1649 // so fill in the canonical type field. 1650 QualType Canonical; 1651 if (!vecType.isCanonical()) { 1652 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1653 1654 // Get the new insert position for the node we care about. 1655 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1656 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1657 } 1658 ExtVectorType *New = new (*this, TypeAlignment) 1659 ExtVectorType(vecType, NumElts, Canonical); 1660 VectorTypes.InsertNode(New, InsertPos); 1661 Types.push_back(New); 1662 return QualType(New, 0); 1663} 1664 1665QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1666 Expr *SizeExpr, 1667 SourceLocation AttrLoc) { 1668 llvm::FoldingSetNodeID ID; 1669 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1670 SizeExpr); 1671 1672 void *InsertPos = 0; 1673 DependentSizedExtVectorType *Canon 1674 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1675 DependentSizedExtVectorType *New; 1676 if (Canon) { 1677 // We already have a canonical version of this array type; use it as 1678 // the canonical type for a newly-built type. 1679 New = new (*this, TypeAlignment) 1680 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1681 SizeExpr, AttrLoc); 1682 } else { 1683 QualType CanonVecTy = getCanonicalType(vecType); 1684 if (CanonVecTy == vecType) { 1685 New = new (*this, TypeAlignment) 1686 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1687 AttrLoc); 1688 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1689 } else { 1690 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1691 SourceLocation()); 1692 New = new (*this, TypeAlignment) 1693 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1694 } 1695 } 1696 1697 Types.push_back(New); 1698 return QualType(New, 0); 1699} 1700 1701/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1702/// 1703QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1704 // Unique functions, to guarantee there is only one function of a particular 1705 // structure. 1706 llvm::FoldingSetNodeID ID; 1707 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1708 1709 void *InsertPos = 0; 1710 if (FunctionNoProtoType *FT = 1711 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1712 return QualType(FT, 0); 1713 1714 QualType Canonical; 1715 if (!ResultTy.isCanonical()) { 1716 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1717 1718 // Get the new insert position for the node we care about. 1719 FunctionNoProtoType *NewIP = 1720 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1721 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1722 } 1723 1724 FunctionNoProtoType *New = new (*this, TypeAlignment) 1725 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1726 Types.push_back(New); 1727 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1728 return QualType(New, 0); 1729} 1730 1731/// getFunctionType - Return a normal function type with a typed argument 1732/// list. isVariadic indicates whether the argument list includes '...'. 1733QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1734 unsigned NumArgs, bool isVariadic, 1735 unsigned TypeQuals, bool hasExceptionSpec, 1736 bool hasAnyExceptionSpec, unsigned NumExs, 1737 const QualType *ExArray, bool NoReturn) { 1738 // Unique functions, to guarantee there is only one function of a particular 1739 // structure. 1740 llvm::FoldingSetNodeID ID; 1741 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1742 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1743 NumExs, ExArray, NoReturn); 1744 1745 void *InsertPos = 0; 1746 if (FunctionProtoType *FTP = 1747 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1748 return QualType(FTP, 0); 1749 1750 // Determine whether the type being created is already canonical or not. 1751 bool isCanonical = !hasExceptionSpec && ResultTy.isCanonical(); 1752 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1753 if (!ArgArray[i].isCanonicalAsParam()) 1754 isCanonical = false; 1755 1756 // If this type isn't canonical, get the canonical version of it. 1757 // The exception spec is not part of the canonical type. 1758 QualType Canonical; 1759 if (!isCanonical) { 1760 llvm::SmallVector<QualType, 16> CanonicalArgs; 1761 CanonicalArgs.reserve(NumArgs); 1762 for (unsigned i = 0; i != NumArgs; ++i) 1763 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1764 1765 Canonical = getFunctionType(getCanonicalType(ResultTy), 1766 CanonicalArgs.data(), NumArgs, 1767 isVariadic, TypeQuals, false, 1768 false, 0, 0, NoReturn); 1769 1770 // Get the new insert position for the node we care about. 1771 FunctionProtoType *NewIP = 1772 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1773 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1774 } 1775 1776 // FunctionProtoType objects are allocated with extra bytes after them 1777 // for two variable size arrays (for parameter and exception types) at the 1778 // end of them. 1779 FunctionProtoType *FTP = 1780 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1781 NumArgs*sizeof(QualType) + 1782 NumExs*sizeof(QualType), TypeAlignment); 1783 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1784 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1785 ExArray, NumExs, Canonical, NoReturn); 1786 Types.push_back(FTP); 1787 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1788 return QualType(FTP, 0); 1789} 1790 1791/// getTypeDeclType - Return the unique reference to the type for the 1792/// specified type declaration. 1793QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1794 assert(Decl && "Passed null for Decl param"); 1795 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1796 1797 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1798 return getTypedefType(Typedef); 1799 else if (isa<TemplateTypeParmDecl>(Decl)) { 1800 assert(false && "Template type parameter types are always available."); 1801 } else if (ObjCInterfaceDecl *ObjCInterface 1802 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1803 return getObjCInterfaceType(ObjCInterface); 1804 1805 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1806 if (PrevDecl) 1807 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1808 else 1809 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1810 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1811 if (PrevDecl) 1812 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1813 else 1814 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1815 } else if (UnresolvedUsingTypenameDecl *Using = 1816 dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) { 1817 Decl->TypeForDecl = new (*this, TypeAlignment) UnresolvedUsingType(Using); 1818 } else 1819 assert(false && "TypeDecl without a type?"); 1820 1821 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1822 return QualType(Decl->TypeForDecl, 0); 1823} 1824 1825/// getTypedefType - Return the unique reference to the type for the 1826/// specified typename decl. 1827QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1828 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1829 1830 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1831 Decl->TypeForDecl = new(*this, TypeAlignment) 1832 TypedefType(Type::Typedef, Decl, Canonical); 1833 Types.push_back(Decl->TypeForDecl); 1834 return QualType(Decl->TypeForDecl, 0); 1835} 1836 1837/// \brief Retrieve a substitution-result type. 1838QualType 1839ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1840 QualType Replacement) { 1841 assert(Replacement.isCanonical() 1842 && "replacement types must always be canonical"); 1843 1844 llvm::FoldingSetNodeID ID; 1845 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1846 void *InsertPos = 0; 1847 SubstTemplateTypeParmType *SubstParm 1848 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1849 1850 if (!SubstParm) { 1851 SubstParm = new (*this, TypeAlignment) 1852 SubstTemplateTypeParmType(Parm, Replacement); 1853 Types.push_back(SubstParm); 1854 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1855 } 1856 1857 return QualType(SubstParm, 0); 1858} 1859 1860/// \brief Retrieve the template type parameter type for a template 1861/// parameter or parameter pack with the given depth, index, and (optionally) 1862/// name. 1863QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1864 bool ParameterPack, 1865 IdentifierInfo *Name) { 1866 llvm::FoldingSetNodeID ID; 1867 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1868 void *InsertPos = 0; 1869 TemplateTypeParmType *TypeParm 1870 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1871 1872 if (TypeParm) 1873 return QualType(TypeParm, 0); 1874 1875 if (Name) { 1876 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1877 TypeParm = new (*this, TypeAlignment) 1878 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1879 } else 1880 TypeParm = new (*this, TypeAlignment) 1881 TemplateTypeParmType(Depth, Index, ParameterPack); 1882 1883 Types.push_back(TypeParm); 1884 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1885 1886 return QualType(TypeParm, 0); 1887} 1888 1889QualType 1890ASTContext::getTemplateSpecializationType(TemplateName Template, 1891 const TemplateArgumentListInfo &Args, 1892 QualType Canon) { 1893 unsigned NumArgs = Args.size(); 1894 1895 llvm::SmallVector<TemplateArgument, 4> ArgVec; 1896 ArgVec.reserve(NumArgs); 1897 for (unsigned i = 0; i != NumArgs; ++i) 1898 ArgVec.push_back(Args[i].getArgument()); 1899 1900 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, Canon); 1901} 1902 1903QualType 1904ASTContext::getTemplateSpecializationType(TemplateName Template, 1905 const TemplateArgument *Args, 1906 unsigned NumArgs, 1907 QualType Canon) { 1908 if (!Canon.isNull()) 1909 Canon = getCanonicalType(Canon); 1910 else { 1911 // Build the canonical template specialization type. 1912 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1913 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1914 CanonArgs.reserve(NumArgs); 1915 for (unsigned I = 0; I != NumArgs; ++I) 1916 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1917 1918 // Determine whether this canonical template specialization type already 1919 // exists. 1920 llvm::FoldingSetNodeID ID; 1921 TemplateSpecializationType::Profile(ID, CanonTemplate, 1922 CanonArgs.data(), NumArgs, *this); 1923 1924 void *InsertPos = 0; 1925 TemplateSpecializationType *Spec 1926 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1927 1928 if (!Spec) { 1929 // Allocate a new canonical template specialization type. 1930 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1931 sizeof(TemplateArgument) * NumArgs), 1932 TypeAlignment); 1933 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1934 CanonArgs.data(), NumArgs, 1935 Canon); 1936 Types.push_back(Spec); 1937 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1938 } 1939 1940 if (Canon.isNull()) 1941 Canon = QualType(Spec, 0); 1942 assert(Canon->isDependentType() && 1943 "Non-dependent template-id type must have a canonical type"); 1944 } 1945 1946 // Allocate the (non-canonical) template specialization type, but don't 1947 // try to unique it: these types typically have location information that 1948 // we don't unique and don't want to lose. 1949 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1950 sizeof(TemplateArgument) * NumArgs), 1951 TypeAlignment); 1952 TemplateSpecializationType *Spec 1953 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1954 Canon); 1955 1956 Types.push_back(Spec); 1957 return QualType(Spec, 0); 1958} 1959 1960QualType 1961ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1962 QualType NamedType) { 1963 llvm::FoldingSetNodeID ID; 1964 QualifiedNameType::Profile(ID, NNS, NamedType); 1965 1966 void *InsertPos = 0; 1967 QualifiedNameType *T 1968 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1969 if (T) 1970 return QualType(T, 0); 1971 1972 T = new (*this) QualifiedNameType(NNS, NamedType, 1973 getCanonicalType(NamedType)); 1974 Types.push_back(T); 1975 QualifiedNameTypes.InsertNode(T, InsertPos); 1976 return QualType(T, 0); 1977} 1978 1979QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1980 const IdentifierInfo *Name, 1981 QualType Canon) { 1982 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1983 1984 if (Canon.isNull()) { 1985 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1986 if (CanonNNS != NNS) 1987 Canon = getTypenameType(CanonNNS, Name); 1988 } 1989 1990 llvm::FoldingSetNodeID ID; 1991 TypenameType::Profile(ID, NNS, Name); 1992 1993 void *InsertPos = 0; 1994 TypenameType *T 1995 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1996 if (T) 1997 return QualType(T, 0); 1998 1999 T = new (*this) TypenameType(NNS, Name, Canon); 2000 Types.push_back(T); 2001 TypenameTypes.InsertNode(T, InsertPos); 2002 return QualType(T, 0); 2003} 2004 2005QualType 2006ASTContext::getTypenameType(NestedNameSpecifier *NNS, 2007 const TemplateSpecializationType *TemplateId, 2008 QualType Canon) { 2009 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 2010 2011 if (Canon.isNull()) { 2012 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2013 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 2014 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 2015 const TemplateSpecializationType *CanonTemplateId 2016 = CanonType->getAs<TemplateSpecializationType>(); 2017 assert(CanonTemplateId && 2018 "Canonical type must also be a template specialization type"); 2019 Canon = getTypenameType(CanonNNS, CanonTemplateId); 2020 } 2021 } 2022 2023 llvm::FoldingSetNodeID ID; 2024 TypenameType::Profile(ID, NNS, TemplateId); 2025 2026 void *InsertPos = 0; 2027 TypenameType *T 2028 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 2029 if (T) 2030 return QualType(T, 0); 2031 2032 T = new (*this) TypenameType(NNS, TemplateId, Canon); 2033 Types.push_back(T); 2034 TypenameTypes.InsertNode(T, InsertPos); 2035 return QualType(T, 0); 2036} 2037 2038QualType 2039ASTContext::getElaboratedType(QualType UnderlyingType, 2040 ElaboratedType::TagKind Tag) { 2041 llvm::FoldingSetNodeID ID; 2042 ElaboratedType::Profile(ID, UnderlyingType, Tag); 2043 2044 void *InsertPos = 0; 2045 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2046 if (T) 2047 return QualType(T, 0); 2048 2049 QualType Canon = getCanonicalType(UnderlyingType); 2050 2051 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 2052 Types.push_back(T); 2053 ElaboratedTypes.InsertNode(T, InsertPos); 2054 return QualType(T, 0); 2055} 2056 2057/// CmpProtocolNames - Comparison predicate for sorting protocols 2058/// alphabetically. 2059static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 2060 const ObjCProtocolDecl *RHS) { 2061 return LHS->getDeclName() < RHS->getDeclName(); 2062} 2063 2064static bool areSortedAndUniqued(ObjCProtocolDecl **Protocols, 2065 unsigned NumProtocols) { 2066 if (NumProtocols == 0) return true; 2067 2068 for (unsigned i = 1; i != NumProtocols; ++i) 2069 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 2070 return false; 2071 return true; 2072} 2073 2074static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2075 unsigned &NumProtocols) { 2076 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2077 2078 // Sort protocols, keyed by name. 2079 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2080 2081 // Remove duplicates. 2082 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2083 NumProtocols = ProtocolsEnd-Protocols; 2084} 2085 2086/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2087/// the given interface decl and the conforming protocol list. 2088QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 2089 ObjCProtocolDecl **Protocols, 2090 unsigned NumProtocols) { 2091 llvm::FoldingSetNodeID ID; 2092 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 2093 2094 void *InsertPos = 0; 2095 if (ObjCObjectPointerType *QT = 2096 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2097 return QualType(QT, 0); 2098 2099 // Sort the protocol list alphabetically to canonicalize it. 2100 QualType Canonical; 2101 if (!InterfaceT.isCanonical() || 2102 !areSortedAndUniqued(Protocols, NumProtocols)) { 2103 if (!areSortedAndUniqued(Protocols, NumProtocols)) { 2104 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2105 unsigned UniqueCount = NumProtocols; 2106 2107 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2108 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2109 2110 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2111 &Sorted[0], UniqueCount); 2112 } else { 2113 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2114 Protocols, NumProtocols); 2115 } 2116 2117 // Regenerate InsertPos. 2118 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2119 } 2120 2121 // No Match; 2122 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 2123 ObjCObjectPointerType(Canonical, InterfaceT, Protocols, NumProtocols); 2124 2125 Types.push_back(QType); 2126 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2127 return QualType(QType, 0); 2128} 2129 2130/// getObjCInterfaceType - Return the unique reference to the type for the 2131/// specified ObjC interface decl. The list of protocols is optional. 2132QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 2133 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 2134 llvm::FoldingSetNodeID ID; 2135 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 2136 2137 void *InsertPos = 0; 2138 if (ObjCInterfaceType *QT = 2139 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 2140 return QualType(QT, 0); 2141 2142 // Sort the protocol list alphabetically to canonicalize it. 2143 QualType Canonical; 2144 if (NumProtocols && !areSortedAndUniqued(Protocols, NumProtocols)) { 2145 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2146 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2147 2148 unsigned UniqueCount = NumProtocols; 2149 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2150 2151 Canonical = getObjCInterfaceType(Decl, &Sorted[0], UniqueCount); 2152 2153 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos); 2154 } 2155 2156 ObjCInterfaceType *QType = new (*this, TypeAlignment) 2157 ObjCInterfaceType(Canonical, const_cast<ObjCInterfaceDecl*>(Decl), 2158 Protocols, NumProtocols); 2159 2160 Types.push_back(QType); 2161 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 2162 return QualType(QType, 0); 2163} 2164 2165/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2166/// TypeOfExprType AST's (since expression's are never shared). For example, 2167/// multiple declarations that refer to "typeof(x)" all contain different 2168/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2169/// on canonical type's (which are always unique). 2170QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2171 TypeOfExprType *toe; 2172 if (tofExpr->isTypeDependent()) { 2173 llvm::FoldingSetNodeID ID; 2174 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2175 2176 void *InsertPos = 0; 2177 DependentTypeOfExprType *Canon 2178 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2179 if (Canon) { 2180 // We already have a "canonical" version of an identical, dependent 2181 // typeof(expr) type. Use that as our canonical type. 2182 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2183 QualType((TypeOfExprType*)Canon, 0)); 2184 } 2185 else { 2186 // Build a new, canonical typeof(expr) type. 2187 Canon 2188 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2189 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2190 toe = Canon; 2191 } 2192 } else { 2193 QualType Canonical = getCanonicalType(tofExpr->getType()); 2194 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2195 } 2196 Types.push_back(toe); 2197 return QualType(toe, 0); 2198} 2199 2200/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2201/// TypeOfType AST's. The only motivation to unique these nodes would be 2202/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2203/// an issue. This doesn't effect the type checker, since it operates 2204/// on canonical type's (which are always unique). 2205QualType ASTContext::getTypeOfType(QualType tofType) { 2206 QualType Canonical = getCanonicalType(tofType); 2207 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2208 Types.push_back(tot); 2209 return QualType(tot, 0); 2210} 2211 2212/// getDecltypeForExpr - Given an expr, will return the decltype for that 2213/// expression, according to the rules in C++0x [dcl.type.simple]p4 2214static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2215 if (e->isTypeDependent()) 2216 return Context.DependentTy; 2217 2218 // If e is an id expression or a class member access, decltype(e) is defined 2219 // as the type of the entity named by e. 2220 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2221 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2222 return VD->getType(); 2223 } 2224 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2225 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2226 return FD->getType(); 2227 } 2228 // If e is a function call or an invocation of an overloaded operator, 2229 // (parentheses around e are ignored), decltype(e) is defined as the 2230 // return type of that function. 2231 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2232 return CE->getCallReturnType(); 2233 2234 QualType T = e->getType(); 2235 2236 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2237 // defined as T&, otherwise decltype(e) is defined as T. 2238 if (e->isLvalue(Context) == Expr::LV_Valid) 2239 T = Context.getLValueReferenceType(T); 2240 2241 return T; 2242} 2243 2244/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2245/// DecltypeType AST's. The only motivation to unique these nodes would be 2246/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2247/// an issue. This doesn't effect the type checker, since it operates 2248/// on canonical type's (which are always unique). 2249QualType ASTContext::getDecltypeType(Expr *e) { 2250 DecltypeType *dt; 2251 if (e->isTypeDependent()) { 2252 llvm::FoldingSetNodeID ID; 2253 DependentDecltypeType::Profile(ID, *this, e); 2254 2255 void *InsertPos = 0; 2256 DependentDecltypeType *Canon 2257 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2258 if (Canon) { 2259 // We already have a "canonical" version of an equivalent, dependent 2260 // decltype type. Use that as our canonical type. 2261 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2262 QualType((DecltypeType*)Canon, 0)); 2263 } 2264 else { 2265 // Build a new, canonical typeof(expr) type. 2266 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2267 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2268 dt = Canon; 2269 } 2270 } else { 2271 QualType T = getDecltypeForExpr(e, *this); 2272 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2273 } 2274 Types.push_back(dt); 2275 return QualType(dt, 0); 2276} 2277 2278/// getTagDeclType - Return the unique reference to the type for the 2279/// specified TagDecl (struct/union/class/enum) decl. 2280QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2281 assert (Decl); 2282 // FIXME: What is the design on getTagDeclType when it requires casting 2283 // away const? mutable? 2284 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2285} 2286 2287/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2288/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2289/// needs to agree with the definition in <stddef.h>. 2290CanQualType ASTContext::getSizeType() const { 2291 return getFromTargetType(Target.getSizeType()); 2292} 2293 2294/// getSignedWCharType - Return the type of "signed wchar_t". 2295/// Used when in C++, as a GCC extension. 2296QualType ASTContext::getSignedWCharType() const { 2297 // FIXME: derive from "Target" ? 2298 return WCharTy; 2299} 2300 2301/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2302/// Used when in C++, as a GCC extension. 2303QualType ASTContext::getUnsignedWCharType() const { 2304 // FIXME: derive from "Target" ? 2305 return UnsignedIntTy; 2306} 2307 2308/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2309/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2310QualType ASTContext::getPointerDiffType() const { 2311 return getFromTargetType(Target.getPtrDiffType(0)); 2312} 2313 2314//===----------------------------------------------------------------------===// 2315// Type Operators 2316//===----------------------------------------------------------------------===// 2317 2318CanQualType ASTContext::getCanonicalParamType(QualType T) { 2319 // Push qualifiers into arrays, and then discard any remaining 2320 // qualifiers. 2321 T = getCanonicalType(T); 2322 const Type *Ty = T.getTypePtr(); 2323 2324 QualType Result; 2325 if (isa<ArrayType>(Ty)) { 2326 Result = getArrayDecayedType(QualType(Ty,0)); 2327 } else if (isa<FunctionType>(Ty)) { 2328 Result = getPointerType(QualType(Ty, 0)); 2329 } else { 2330 Result = QualType(Ty, 0); 2331 } 2332 2333 return CanQualType::CreateUnsafe(Result); 2334} 2335 2336/// getCanonicalType - Return the canonical (structural) type corresponding to 2337/// the specified potentially non-canonical type. The non-canonical version 2338/// of a type may have many "decorated" versions of types. Decorators can 2339/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2340/// to be free of any of these, allowing two canonical types to be compared 2341/// for exact equality with a simple pointer comparison. 2342CanQualType ASTContext::getCanonicalType(QualType T) { 2343 QualifierCollector Quals; 2344 const Type *Ptr = Quals.strip(T); 2345 QualType CanType = Ptr->getCanonicalTypeInternal(); 2346 2347 // The canonical internal type will be the canonical type *except* 2348 // that we push type qualifiers down through array types. 2349 2350 // If there are no new qualifiers to push down, stop here. 2351 if (!Quals.hasQualifiers()) 2352 return CanQualType::CreateUnsafe(CanType); 2353 2354 // If the type qualifiers are on an array type, get the canonical 2355 // type of the array with the qualifiers applied to the element 2356 // type. 2357 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2358 if (!AT) 2359 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2360 2361 // Get the canonical version of the element with the extra qualifiers on it. 2362 // This can recursively sink qualifiers through multiple levels of arrays. 2363 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2364 NewEltTy = getCanonicalType(NewEltTy); 2365 2366 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2367 return CanQualType::CreateUnsafe( 2368 getConstantArrayType(NewEltTy, CAT->getSize(), 2369 CAT->getSizeModifier(), 2370 CAT->getIndexTypeCVRQualifiers())); 2371 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2372 return CanQualType::CreateUnsafe( 2373 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2374 IAT->getIndexTypeCVRQualifiers())); 2375 2376 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2377 return CanQualType::CreateUnsafe( 2378 getDependentSizedArrayType(NewEltTy, 2379 DSAT->getSizeExpr() ? 2380 DSAT->getSizeExpr()->Retain() : 0, 2381 DSAT->getSizeModifier(), 2382 DSAT->getIndexTypeCVRQualifiers(), 2383 DSAT->getBracketsRange())->getCanonicalTypeInternal()); 2384 2385 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2386 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2387 VAT->getSizeExpr() ? 2388 VAT->getSizeExpr()->Retain() : 0, 2389 VAT->getSizeModifier(), 2390 VAT->getIndexTypeCVRQualifiers(), 2391 VAT->getBracketsRange())); 2392} 2393 2394DeclarationName ASTContext::getNameForTemplate(TemplateName Name) { 2395 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2396 return TD->getDeclName(); 2397 2398 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2399 if (DTN->isIdentifier()) { 2400 return DeclarationNames.getIdentifier(DTN->getIdentifier()); 2401 } else { 2402 return DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2403 } 2404 } 2405 2406 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2407 assert(Storage); 2408 return (*Storage->begin())->getDeclName(); 2409} 2410 2411TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2412 // If this template name refers to a template, the canonical 2413 // template name merely stores the template itself. 2414 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2415 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2416 2417 assert(!Name.getAsOverloadedTemplate()); 2418 2419 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2420 assert(DTN && "Non-dependent template names must refer to template decls."); 2421 return DTN->CanonicalTemplateName; 2422} 2423 2424bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2425 X = getCanonicalTemplateName(X); 2426 Y = getCanonicalTemplateName(Y); 2427 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2428} 2429 2430TemplateArgument 2431ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2432 switch (Arg.getKind()) { 2433 case TemplateArgument::Null: 2434 return Arg; 2435 2436 case TemplateArgument::Expression: 2437 return Arg; 2438 2439 case TemplateArgument::Declaration: 2440 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2441 2442 case TemplateArgument::Template: 2443 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2444 2445 case TemplateArgument::Integral: 2446 return TemplateArgument(*Arg.getAsIntegral(), 2447 getCanonicalType(Arg.getIntegralType())); 2448 2449 case TemplateArgument::Type: 2450 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2451 2452 case TemplateArgument::Pack: { 2453 // FIXME: Allocate in ASTContext 2454 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2455 unsigned Idx = 0; 2456 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2457 AEnd = Arg.pack_end(); 2458 A != AEnd; (void)++A, ++Idx) 2459 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2460 2461 TemplateArgument Result; 2462 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2463 return Result; 2464 } 2465 } 2466 2467 // Silence GCC warning 2468 assert(false && "Unhandled template argument kind"); 2469 return TemplateArgument(); 2470} 2471 2472NestedNameSpecifier * 2473ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2474 if (!NNS) 2475 return 0; 2476 2477 switch (NNS->getKind()) { 2478 case NestedNameSpecifier::Identifier: 2479 // Canonicalize the prefix but keep the identifier the same. 2480 return NestedNameSpecifier::Create(*this, 2481 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2482 NNS->getAsIdentifier()); 2483 2484 case NestedNameSpecifier::Namespace: 2485 // A namespace is canonical; build a nested-name-specifier with 2486 // this namespace and no prefix. 2487 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2488 2489 case NestedNameSpecifier::TypeSpec: 2490 case NestedNameSpecifier::TypeSpecWithTemplate: { 2491 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2492 return NestedNameSpecifier::Create(*this, 0, 2493 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2494 T.getTypePtr()); 2495 } 2496 2497 case NestedNameSpecifier::Global: 2498 // The global specifier is canonical and unique. 2499 return NNS; 2500 } 2501 2502 // Required to silence a GCC warning 2503 return 0; 2504} 2505 2506 2507const ArrayType *ASTContext::getAsArrayType(QualType T) { 2508 // Handle the non-qualified case efficiently. 2509 if (!T.hasLocalQualifiers()) { 2510 // Handle the common positive case fast. 2511 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2512 return AT; 2513 } 2514 2515 // Handle the common negative case fast. 2516 QualType CType = T->getCanonicalTypeInternal(); 2517 if (!isa<ArrayType>(CType)) 2518 return 0; 2519 2520 // Apply any qualifiers from the array type to the element type. This 2521 // implements C99 6.7.3p8: "If the specification of an array type includes 2522 // any type qualifiers, the element type is so qualified, not the array type." 2523 2524 // If we get here, we either have type qualifiers on the type, or we have 2525 // sugar such as a typedef in the way. If we have type qualifiers on the type 2526 // we must propagate them down into the element type. 2527 2528 QualifierCollector Qs; 2529 const Type *Ty = Qs.strip(T.getDesugaredType()); 2530 2531 // If we have a simple case, just return now. 2532 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2533 if (ATy == 0 || Qs.empty()) 2534 return ATy; 2535 2536 // Otherwise, we have an array and we have qualifiers on it. Push the 2537 // qualifiers into the array element type and return a new array type. 2538 // Get the canonical version of the element with the extra qualifiers on it. 2539 // This can recursively sink qualifiers through multiple levels of arrays. 2540 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2541 2542 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2543 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2544 CAT->getSizeModifier(), 2545 CAT->getIndexTypeCVRQualifiers())); 2546 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2547 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2548 IAT->getSizeModifier(), 2549 IAT->getIndexTypeCVRQualifiers())); 2550 2551 if (const DependentSizedArrayType *DSAT 2552 = dyn_cast<DependentSizedArrayType>(ATy)) 2553 return cast<ArrayType>( 2554 getDependentSizedArrayType(NewEltTy, 2555 DSAT->getSizeExpr() ? 2556 DSAT->getSizeExpr()->Retain() : 0, 2557 DSAT->getSizeModifier(), 2558 DSAT->getIndexTypeCVRQualifiers(), 2559 DSAT->getBracketsRange())); 2560 2561 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2562 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2563 VAT->getSizeExpr() ? 2564 VAT->getSizeExpr()->Retain() : 0, 2565 VAT->getSizeModifier(), 2566 VAT->getIndexTypeCVRQualifiers(), 2567 VAT->getBracketsRange())); 2568} 2569 2570 2571/// getArrayDecayedType - Return the properly qualified result of decaying the 2572/// specified array type to a pointer. This operation is non-trivial when 2573/// handling typedefs etc. The canonical type of "T" must be an array type, 2574/// this returns a pointer to a properly qualified element of the array. 2575/// 2576/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2577QualType ASTContext::getArrayDecayedType(QualType Ty) { 2578 // Get the element type with 'getAsArrayType' so that we don't lose any 2579 // typedefs in the element type of the array. This also handles propagation 2580 // of type qualifiers from the array type into the element type if present 2581 // (C99 6.7.3p8). 2582 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2583 assert(PrettyArrayType && "Not an array type!"); 2584 2585 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2586 2587 // int x[restrict 4] -> int *restrict 2588 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2589} 2590 2591QualType ASTContext::getBaseElementType(QualType QT) { 2592 QualifierCollector Qs; 2593 while (true) { 2594 const Type *UT = Qs.strip(QT); 2595 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2596 QT = AT->getElementType(); 2597 } else { 2598 return Qs.apply(QT); 2599 } 2600 } 2601} 2602 2603QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2604 QualType ElemTy = AT->getElementType(); 2605 2606 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2607 return getBaseElementType(AT); 2608 2609 return ElemTy; 2610} 2611 2612/// getConstantArrayElementCount - Returns number of constant array elements. 2613uint64_t 2614ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2615 uint64_t ElementCount = 1; 2616 do { 2617 ElementCount *= CA->getSize().getZExtValue(); 2618 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2619 } while (CA); 2620 return ElementCount; 2621} 2622 2623/// getFloatingRank - Return a relative rank for floating point types. 2624/// This routine will assert if passed a built-in type that isn't a float. 2625static FloatingRank getFloatingRank(QualType T) { 2626 if (const ComplexType *CT = T->getAs<ComplexType>()) 2627 return getFloatingRank(CT->getElementType()); 2628 2629 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2630 switch (T->getAs<BuiltinType>()->getKind()) { 2631 default: assert(0 && "getFloatingRank(): not a floating type"); 2632 case BuiltinType::Float: return FloatRank; 2633 case BuiltinType::Double: return DoubleRank; 2634 case BuiltinType::LongDouble: return LongDoubleRank; 2635 } 2636} 2637 2638/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2639/// point or a complex type (based on typeDomain/typeSize). 2640/// 'typeDomain' is a real floating point or complex type. 2641/// 'typeSize' is a real floating point or complex type. 2642QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2643 QualType Domain) const { 2644 FloatingRank EltRank = getFloatingRank(Size); 2645 if (Domain->isComplexType()) { 2646 switch (EltRank) { 2647 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2648 case FloatRank: return FloatComplexTy; 2649 case DoubleRank: return DoubleComplexTy; 2650 case LongDoubleRank: return LongDoubleComplexTy; 2651 } 2652 } 2653 2654 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2655 switch (EltRank) { 2656 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2657 case FloatRank: return FloatTy; 2658 case DoubleRank: return DoubleTy; 2659 case LongDoubleRank: return LongDoubleTy; 2660 } 2661} 2662 2663/// getFloatingTypeOrder - Compare the rank of the two specified floating 2664/// point types, ignoring the domain of the type (i.e. 'double' == 2665/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2666/// LHS < RHS, return -1. 2667int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2668 FloatingRank LHSR = getFloatingRank(LHS); 2669 FloatingRank RHSR = getFloatingRank(RHS); 2670 2671 if (LHSR == RHSR) 2672 return 0; 2673 if (LHSR > RHSR) 2674 return 1; 2675 return -1; 2676} 2677 2678/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2679/// routine will assert if passed a built-in type that isn't an integer or enum, 2680/// or if it is not canonicalized. 2681unsigned ASTContext::getIntegerRank(Type *T) { 2682 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 2683 if (EnumType* ET = dyn_cast<EnumType>(T)) 2684 T = ET->getDecl()->getPromotionType().getTypePtr(); 2685 2686 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2687 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2688 2689 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2690 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2691 2692 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2693 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2694 2695 // There are two things which impact the integer rank: the width, and 2696 // the ordering of builtins. The builtin ordering is encoded in the 2697 // bottom three bits; the width is encoded in the bits above that. 2698 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2699 return FWIT->getWidth() << 3; 2700 2701 switch (cast<BuiltinType>(T)->getKind()) { 2702 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2703 case BuiltinType::Bool: 2704 return 1 + (getIntWidth(BoolTy) << 3); 2705 case BuiltinType::Char_S: 2706 case BuiltinType::Char_U: 2707 case BuiltinType::SChar: 2708 case BuiltinType::UChar: 2709 return 2 + (getIntWidth(CharTy) << 3); 2710 case BuiltinType::Short: 2711 case BuiltinType::UShort: 2712 return 3 + (getIntWidth(ShortTy) << 3); 2713 case BuiltinType::Int: 2714 case BuiltinType::UInt: 2715 return 4 + (getIntWidth(IntTy) << 3); 2716 case BuiltinType::Long: 2717 case BuiltinType::ULong: 2718 return 5 + (getIntWidth(LongTy) << 3); 2719 case BuiltinType::LongLong: 2720 case BuiltinType::ULongLong: 2721 return 6 + (getIntWidth(LongLongTy) << 3); 2722 case BuiltinType::Int128: 2723 case BuiltinType::UInt128: 2724 return 7 + (getIntWidth(Int128Ty) << 3); 2725 } 2726} 2727 2728/// \brief Whether this is a promotable bitfield reference according 2729/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2730/// 2731/// \returns the type this bit-field will promote to, or NULL if no 2732/// promotion occurs. 2733QualType ASTContext::isPromotableBitField(Expr *E) { 2734 FieldDecl *Field = E->getBitField(); 2735 if (!Field) 2736 return QualType(); 2737 2738 QualType FT = Field->getType(); 2739 2740 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2741 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2742 uint64_t IntSize = getTypeSize(IntTy); 2743 // GCC extension compatibility: if the bit-field size is less than or equal 2744 // to the size of int, it gets promoted no matter what its type is. 2745 // For instance, unsigned long bf : 4 gets promoted to signed int. 2746 if (BitWidth < IntSize) 2747 return IntTy; 2748 2749 if (BitWidth == IntSize) 2750 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2751 2752 // Types bigger than int are not subject to promotions, and therefore act 2753 // like the base type. 2754 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2755 // is ridiculous. 2756 return QualType(); 2757} 2758 2759/// getPromotedIntegerType - Returns the type that Promotable will 2760/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2761/// integer type. 2762QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2763 assert(!Promotable.isNull()); 2764 assert(Promotable->isPromotableIntegerType()); 2765 if (const EnumType *ET = Promotable->getAs<EnumType>()) 2766 return ET->getDecl()->getPromotionType(); 2767 if (Promotable->isSignedIntegerType()) 2768 return IntTy; 2769 uint64_t PromotableSize = getTypeSize(Promotable); 2770 uint64_t IntSize = getTypeSize(IntTy); 2771 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2772 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2773} 2774 2775/// getIntegerTypeOrder - Returns the highest ranked integer type: 2776/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2777/// LHS < RHS, return -1. 2778int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2779 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2780 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2781 if (LHSC == RHSC) return 0; 2782 2783 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2784 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2785 2786 unsigned LHSRank = getIntegerRank(LHSC); 2787 unsigned RHSRank = getIntegerRank(RHSC); 2788 2789 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2790 if (LHSRank == RHSRank) return 0; 2791 return LHSRank > RHSRank ? 1 : -1; 2792 } 2793 2794 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2795 if (LHSUnsigned) { 2796 // If the unsigned [LHS] type is larger, return it. 2797 if (LHSRank >= RHSRank) 2798 return 1; 2799 2800 // If the signed type can represent all values of the unsigned type, it 2801 // wins. Because we are dealing with 2's complement and types that are 2802 // powers of two larger than each other, this is always safe. 2803 return -1; 2804 } 2805 2806 // If the unsigned [RHS] type is larger, return it. 2807 if (RHSRank >= LHSRank) 2808 return -1; 2809 2810 // If the signed type can represent all values of the unsigned type, it 2811 // wins. Because we are dealing with 2's complement and types that are 2812 // powers of two larger than each other, this is always safe. 2813 return 1; 2814} 2815 2816static RecordDecl * 2817CreateRecordDecl(ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 2818 SourceLocation L, IdentifierInfo *Id) { 2819 if (Ctx.getLangOptions().CPlusPlus) 2820 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 2821 else 2822 return RecordDecl::Create(Ctx, TK, DC, L, Id); 2823} 2824 2825// getCFConstantStringType - Return the type used for constant CFStrings. 2826QualType ASTContext::getCFConstantStringType() { 2827 if (!CFConstantStringTypeDecl) { 2828 CFConstantStringTypeDecl = 2829 CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2830 &Idents.get("NSConstantString")); 2831 2832 QualType FieldTypes[4]; 2833 2834 // const int *isa; 2835 FieldTypes[0] = getPointerType(IntTy.withConst()); 2836 // int flags; 2837 FieldTypes[1] = IntTy; 2838 // const char *str; 2839 FieldTypes[2] = getPointerType(CharTy.withConst()); 2840 // long length; 2841 FieldTypes[3] = LongTy; 2842 2843 // Create fields 2844 for (unsigned i = 0; i < 4; ++i) { 2845 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2846 SourceLocation(), 0, 2847 FieldTypes[i], /*TInfo=*/0, 2848 /*BitWidth=*/0, 2849 /*Mutable=*/false); 2850 CFConstantStringTypeDecl->addDecl(Field); 2851 } 2852 2853 CFConstantStringTypeDecl->completeDefinition(*this); 2854 } 2855 2856 return getTagDeclType(CFConstantStringTypeDecl); 2857} 2858 2859void ASTContext::setCFConstantStringType(QualType T) { 2860 const RecordType *Rec = T->getAs<RecordType>(); 2861 assert(Rec && "Invalid CFConstantStringType"); 2862 CFConstantStringTypeDecl = Rec->getDecl(); 2863} 2864 2865QualType ASTContext::getObjCFastEnumerationStateType() { 2866 if (!ObjCFastEnumerationStateTypeDecl) { 2867 ObjCFastEnumerationStateTypeDecl = 2868 CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2869 &Idents.get("__objcFastEnumerationState")); 2870 2871 QualType FieldTypes[] = { 2872 UnsignedLongTy, 2873 getPointerType(ObjCIdTypedefType), 2874 getPointerType(UnsignedLongTy), 2875 getConstantArrayType(UnsignedLongTy, 2876 llvm::APInt(32, 5), ArrayType::Normal, 0) 2877 }; 2878 2879 for (size_t i = 0; i < 4; ++i) { 2880 FieldDecl *Field = FieldDecl::Create(*this, 2881 ObjCFastEnumerationStateTypeDecl, 2882 SourceLocation(), 0, 2883 FieldTypes[i], /*TInfo=*/0, 2884 /*BitWidth=*/0, 2885 /*Mutable=*/false); 2886 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2887 } 2888 2889 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2890 } 2891 2892 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2893} 2894 2895QualType ASTContext::getBlockDescriptorType() { 2896 if (BlockDescriptorType) 2897 return getTagDeclType(BlockDescriptorType); 2898 2899 RecordDecl *T; 2900 // FIXME: Needs the FlagAppleBlock bit. 2901 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2902 &Idents.get("__block_descriptor")); 2903 2904 QualType FieldTypes[] = { 2905 UnsignedLongTy, 2906 UnsignedLongTy, 2907 }; 2908 2909 const char *FieldNames[] = { 2910 "reserved", 2911 "Size" 2912 }; 2913 2914 for (size_t i = 0; i < 2; ++i) { 2915 FieldDecl *Field = FieldDecl::Create(*this, 2916 T, 2917 SourceLocation(), 2918 &Idents.get(FieldNames[i]), 2919 FieldTypes[i], /*TInfo=*/0, 2920 /*BitWidth=*/0, 2921 /*Mutable=*/false); 2922 T->addDecl(Field); 2923 } 2924 2925 T->completeDefinition(*this); 2926 2927 BlockDescriptorType = T; 2928 2929 return getTagDeclType(BlockDescriptorType); 2930} 2931 2932void ASTContext::setBlockDescriptorType(QualType T) { 2933 const RecordType *Rec = T->getAs<RecordType>(); 2934 assert(Rec && "Invalid BlockDescriptorType"); 2935 BlockDescriptorType = Rec->getDecl(); 2936} 2937 2938QualType ASTContext::getBlockDescriptorExtendedType() { 2939 if (BlockDescriptorExtendedType) 2940 return getTagDeclType(BlockDescriptorExtendedType); 2941 2942 RecordDecl *T; 2943 // FIXME: Needs the FlagAppleBlock bit. 2944 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2945 &Idents.get("__block_descriptor_withcopydispose")); 2946 2947 QualType FieldTypes[] = { 2948 UnsignedLongTy, 2949 UnsignedLongTy, 2950 getPointerType(VoidPtrTy), 2951 getPointerType(VoidPtrTy) 2952 }; 2953 2954 const char *FieldNames[] = { 2955 "reserved", 2956 "Size", 2957 "CopyFuncPtr", 2958 "DestroyFuncPtr" 2959 }; 2960 2961 for (size_t i = 0; i < 4; ++i) { 2962 FieldDecl *Field = FieldDecl::Create(*this, 2963 T, 2964 SourceLocation(), 2965 &Idents.get(FieldNames[i]), 2966 FieldTypes[i], /*TInfo=*/0, 2967 /*BitWidth=*/0, 2968 /*Mutable=*/false); 2969 T->addDecl(Field); 2970 } 2971 2972 T->completeDefinition(*this); 2973 2974 BlockDescriptorExtendedType = T; 2975 2976 return getTagDeclType(BlockDescriptorExtendedType); 2977} 2978 2979void ASTContext::setBlockDescriptorExtendedType(QualType T) { 2980 const RecordType *Rec = T->getAs<RecordType>(); 2981 assert(Rec && "Invalid BlockDescriptorType"); 2982 BlockDescriptorExtendedType = Rec->getDecl(); 2983} 2984 2985bool ASTContext::BlockRequiresCopying(QualType Ty) { 2986 if (Ty->isBlockPointerType()) 2987 return true; 2988 if (isObjCNSObjectType(Ty)) 2989 return true; 2990 if (Ty->isObjCObjectPointerType()) 2991 return true; 2992 return false; 2993} 2994 2995QualType ASTContext::BuildByRefType(const char *DeclName, QualType Ty) { 2996 // type = struct __Block_byref_1_X { 2997 // void *__isa; 2998 // struct __Block_byref_1_X *__forwarding; 2999 // unsigned int __flags; 3000 // unsigned int __size; 3001 // void *__copy_helper; // as needed 3002 // void *__destroy_help // as needed 3003 // int X; 3004 // } * 3005 3006 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 3007 3008 // FIXME: Move up 3009 static unsigned int UniqueBlockByRefTypeID = 0; 3010 llvm::SmallString<36> Name; 3011 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 3012 ++UniqueBlockByRefTypeID << '_' << DeclName; 3013 RecordDecl *T; 3014 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 3015 &Idents.get(Name.str())); 3016 T->startDefinition(); 3017 QualType Int32Ty = IntTy; 3018 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 3019 QualType FieldTypes[] = { 3020 getPointerType(VoidPtrTy), 3021 getPointerType(getTagDeclType(T)), 3022 Int32Ty, 3023 Int32Ty, 3024 getPointerType(VoidPtrTy), 3025 getPointerType(VoidPtrTy), 3026 Ty 3027 }; 3028 3029 const char *FieldNames[] = { 3030 "__isa", 3031 "__forwarding", 3032 "__flags", 3033 "__size", 3034 "__copy_helper", 3035 "__destroy_helper", 3036 DeclName, 3037 }; 3038 3039 for (size_t i = 0; i < 7; ++i) { 3040 if (!HasCopyAndDispose && i >=4 && i <= 5) 3041 continue; 3042 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3043 &Idents.get(FieldNames[i]), 3044 FieldTypes[i], /*TInfo=*/0, 3045 /*BitWidth=*/0, /*Mutable=*/false); 3046 T->addDecl(Field); 3047 } 3048 3049 T->completeDefinition(*this); 3050 3051 return getPointerType(getTagDeclType(T)); 3052} 3053 3054 3055QualType ASTContext::getBlockParmType( 3056 bool BlockHasCopyDispose, 3057 llvm::SmallVector<const Expr *, 8> &BlockDeclRefDecls) { 3058 // FIXME: Move up 3059 static unsigned int UniqueBlockParmTypeID = 0; 3060 llvm::SmallString<36> Name; 3061 llvm::raw_svector_ostream(Name) << "__block_literal_" 3062 << ++UniqueBlockParmTypeID; 3063 RecordDecl *T; 3064 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 3065 &Idents.get(Name.str())); 3066 QualType FieldTypes[] = { 3067 getPointerType(VoidPtrTy), 3068 IntTy, 3069 IntTy, 3070 getPointerType(VoidPtrTy), 3071 (BlockHasCopyDispose ? 3072 getPointerType(getBlockDescriptorExtendedType()) : 3073 getPointerType(getBlockDescriptorType())) 3074 }; 3075 3076 const char *FieldNames[] = { 3077 "__isa", 3078 "__flags", 3079 "__reserved", 3080 "__FuncPtr", 3081 "__descriptor" 3082 }; 3083 3084 for (size_t i = 0; i < 5; ++i) { 3085 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3086 &Idents.get(FieldNames[i]), 3087 FieldTypes[i], /*TInfo=*/0, 3088 /*BitWidth=*/0, /*Mutable=*/false); 3089 T->addDecl(Field); 3090 } 3091 3092 for (size_t i = 0; i < BlockDeclRefDecls.size(); ++i) { 3093 const Expr *E = BlockDeclRefDecls[i]; 3094 const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); 3095 clang::IdentifierInfo *Name = 0; 3096 if (BDRE) { 3097 const ValueDecl *D = BDRE->getDecl(); 3098 Name = &Idents.get(D->getName()); 3099 } 3100 QualType FieldType = E->getType(); 3101 3102 if (BDRE && BDRE->isByRef()) 3103 FieldType = BuildByRefType(BDRE->getDecl()->getNameAsCString(), 3104 FieldType); 3105 3106 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3107 Name, FieldType, /*TInfo=*/0, 3108 /*BitWidth=*/0, /*Mutable=*/false); 3109 T->addDecl(Field); 3110 } 3111 3112 T->completeDefinition(*this); 3113 3114 return getPointerType(getTagDeclType(T)); 3115} 3116 3117void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3118 const RecordType *Rec = T->getAs<RecordType>(); 3119 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3120 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3121} 3122 3123// This returns true if a type has been typedefed to BOOL: 3124// typedef <type> BOOL; 3125static bool isTypeTypedefedAsBOOL(QualType T) { 3126 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3127 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3128 return II->isStr("BOOL"); 3129 3130 return false; 3131} 3132 3133/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3134/// purpose. 3135int ASTContext::getObjCEncodingTypeSize(QualType type) { 3136 uint64_t sz = getTypeSize(type); 3137 3138 // Make all integer and enum types at least as large as an int 3139 if (sz > 0 && type->isIntegralType()) 3140 sz = std::max(sz, getTypeSize(IntTy)); 3141 // Treat arrays as pointers, since that's how they're passed in. 3142 else if (type->isArrayType()) 3143 sz = getTypeSize(VoidPtrTy); 3144 return sz / getTypeSize(CharTy); 3145} 3146 3147/// getObjCEncodingForBlockDecl - Return the encoded type for this method 3148/// declaration. 3149void ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr, 3150 std::string& S) { 3151 const BlockDecl *Decl = Expr->getBlockDecl(); 3152 QualType BlockTy = 3153 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3154 // Encode result type. 3155 getObjCEncodingForType(cast<FunctionType>(BlockTy)->getResultType(), S); 3156 // Compute size of all parameters. 3157 // Start with computing size of a pointer in number of bytes. 3158 // FIXME: There might(should) be a better way of doing this computation! 3159 SourceLocation Loc; 3160 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 3161 int ParmOffset = PtrSize; 3162 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3163 E = Decl->param_end(); PI != E; ++PI) { 3164 QualType PType = (*PI)->getType(); 3165 int sz = getObjCEncodingTypeSize(PType); 3166 assert (sz > 0 && "BlockExpr - Incomplete param type"); 3167 ParmOffset += sz; 3168 } 3169 // Size of the argument frame 3170 S += llvm::utostr(ParmOffset); 3171 // Block pointer and offset. 3172 S += "@?0"; 3173 ParmOffset = PtrSize; 3174 3175 // Argument types. 3176 ParmOffset = PtrSize; 3177 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3178 Decl->param_end(); PI != E; ++PI) { 3179 ParmVarDecl *PVDecl = *PI; 3180 QualType PType = PVDecl->getOriginalType(); 3181 if (const ArrayType *AT = 3182 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3183 // Use array's original type only if it has known number of 3184 // elements. 3185 if (!isa<ConstantArrayType>(AT)) 3186 PType = PVDecl->getType(); 3187 } else if (PType->isFunctionType()) 3188 PType = PVDecl->getType(); 3189 getObjCEncodingForType(PType, S); 3190 S += llvm::utostr(ParmOffset); 3191 ParmOffset += getObjCEncodingTypeSize(PType); 3192 } 3193} 3194 3195/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3196/// declaration. 3197void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3198 std::string& S) { 3199 // FIXME: This is not very efficient. 3200 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3201 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3202 // Encode result type. 3203 getObjCEncodingForType(Decl->getResultType(), S); 3204 // Compute size of all parameters. 3205 // Start with computing size of a pointer in number of bytes. 3206 // FIXME: There might(should) be a better way of doing this computation! 3207 SourceLocation Loc; 3208 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 3209 // The first two arguments (self and _cmd) are pointers; account for 3210 // their size. 3211 int ParmOffset = 2 * PtrSize; 3212 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3213 E = Decl->param_end(); PI != E; ++PI) { 3214 QualType PType = (*PI)->getType(); 3215 int sz = getObjCEncodingTypeSize(PType); 3216 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 3217 ParmOffset += sz; 3218 } 3219 S += llvm::utostr(ParmOffset); 3220 S += "@0:"; 3221 S += llvm::utostr(PtrSize); 3222 3223 // Argument types. 3224 ParmOffset = 2 * PtrSize; 3225 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3226 E = Decl->param_end(); PI != E; ++PI) { 3227 ParmVarDecl *PVDecl = *PI; 3228 QualType PType = PVDecl->getOriginalType(); 3229 if (const ArrayType *AT = 3230 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3231 // Use array's original type only if it has known number of 3232 // elements. 3233 if (!isa<ConstantArrayType>(AT)) 3234 PType = PVDecl->getType(); 3235 } else if (PType->isFunctionType()) 3236 PType = PVDecl->getType(); 3237 // Process argument qualifiers for user supplied arguments; such as, 3238 // 'in', 'inout', etc. 3239 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3240 getObjCEncodingForType(PType, S); 3241 S += llvm::utostr(ParmOffset); 3242 ParmOffset += getObjCEncodingTypeSize(PType); 3243 } 3244} 3245 3246/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3247/// property declaration. If non-NULL, Container must be either an 3248/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3249/// NULL when getting encodings for protocol properties. 3250/// Property attributes are stored as a comma-delimited C string. The simple 3251/// attributes readonly and bycopy are encoded as single characters. The 3252/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3253/// encoded as single characters, followed by an identifier. Property types 3254/// are also encoded as a parametrized attribute. The characters used to encode 3255/// these attributes are defined by the following enumeration: 3256/// @code 3257/// enum PropertyAttributes { 3258/// kPropertyReadOnly = 'R', // property is read-only. 3259/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3260/// kPropertyByref = '&', // property is a reference to the value last assigned 3261/// kPropertyDynamic = 'D', // property is dynamic 3262/// kPropertyGetter = 'G', // followed by getter selector name 3263/// kPropertySetter = 'S', // followed by setter selector name 3264/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3265/// kPropertyType = 't' // followed by old-style type encoding. 3266/// kPropertyWeak = 'W' // 'weak' property 3267/// kPropertyStrong = 'P' // property GC'able 3268/// kPropertyNonAtomic = 'N' // property non-atomic 3269/// }; 3270/// @endcode 3271void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3272 const Decl *Container, 3273 std::string& S) { 3274 // Collect information from the property implementation decl(s). 3275 bool Dynamic = false; 3276 ObjCPropertyImplDecl *SynthesizePID = 0; 3277 3278 // FIXME: Duplicated code due to poor abstraction. 3279 if (Container) { 3280 if (const ObjCCategoryImplDecl *CID = 3281 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3282 for (ObjCCategoryImplDecl::propimpl_iterator 3283 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3284 i != e; ++i) { 3285 ObjCPropertyImplDecl *PID = *i; 3286 if (PID->getPropertyDecl() == PD) { 3287 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3288 Dynamic = true; 3289 } else { 3290 SynthesizePID = PID; 3291 } 3292 } 3293 } 3294 } else { 3295 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3296 for (ObjCCategoryImplDecl::propimpl_iterator 3297 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3298 i != e; ++i) { 3299 ObjCPropertyImplDecl *PID = *i; 3300 if (PID->getPropertyDecl() == PD) { 3301 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3302 Dynamic = true; 3303 } else { 3304 SynthesizePID = PID; 3305 } 3306 } 3307 } 3308 } 3309 } 3310 3311 // FIXME: This is not very efficient. 3312 S = "T"; 3313 3314 // Encode result type. 3315 // GCC has some special rules regarding encoding of properties which 3316 // closely resembles encoding of ivars. 3317 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3318 true /* outermost type */, 3319 true /* encoding for property */); 3320 3321 if (PD->isReadOnly()) { 3322 S += ",R"; 3323 } else { 3324 switch (PD->getSetterKind()) { 3325 case ObjCPropertyDecl::Assign: break; 3326 case ObjCPropertyDecl::Copy: S += ",C"; break; 3327 case ObjCPropertyDecl::Retain: S += ",&"; break; 3328 } 3329 } 3330 3331 // It really isn't clear at all what this means, since properties 3332 // are "dynamic by default". 3333 if (Dynamic) 3334 S += ",D"; 3335 3336 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3337 S += ",N"; 3338 3339 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3340 S += ",G"; 3341 S += PD->getGetterName().getAsString(); 3342 } 3343 3344 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3345 S += ",S"; 3346 S += PD->getSetterName().getAsString(); 3347 } 3348 3349 if (SynthesizePID) { 3350 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3351 S += ",V"; 3352 S += OID->getNameAsString(); 3353 } 3354 3355 // FIXME: OBJCGC: weak & strong 3356} 3357 3358/// getLegacyIntegralTypeEncoding - 3359/// Another legacy compatibility encoding: 32-bit longs are encoded as 3360/// 'l' or 'L' , but not always. For typedefs, we need to use 3361/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3362/// 3363void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3364 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3365 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3366 if (BT->getKind() == BuiltinType::ULong && 3367 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3368 PointeeTy = UnsignedIntTy; 3369 else 3370 if (BT->getKind() == BuiltinType::Long && 3371 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3372 PointeeTy = IntTy; 3373 } 3374 } 3375} 3376 3377void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3378 const FieldDecl *Field) { 3379 // We follow the behavior of gcc, expanding structures which are 3380 // directly pointed to, and expanding embedded structures. Note that 3381 // these rules are sufficient to prevent recursive encoding of the 3382 // same type. 3383 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3384 true /* outermost type */); 3385} 3386 3387static void EncodeBitField(const ASTContext *Context, std::string& S, 3388 const FieldDecl *FD) { 3389 const Expr *E = FD->getBitWidth(); 3390 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3391 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3392 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3393 S += 'b'; 3394 S += llvm::utostr(N); 3395} 3396 3397// FIXME: Use SmallString for accumulating string. 3398void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3399 bool ExpandPointedToStructures, 3400 bool ExpandStructures, 3401 const FieldDecl *FD, 3402 bool OutermostType, 3403 bool EncodingProperty) { 3404 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3405 if (FD && FD->isBitField()) 3406 return EncodeBitField(this, S, FD); 3407 char encoding; 3408 switch (BT->getKind()) { 3409 default: assert(0 && "Unhandled builtin type kind"); 3410 case BuiltinType::Void: encoding = 'v'; break; 3411 case BuiltinType::Bool: encoding = 'B'; break; 3412 case BuiltinType::Char_U: 3413 case BuiltinType::UChar: encoding = 'C'; break; 3414 case BuiltinType::UShort: encoding = 'S'; break; 3415 case BuiltinType::UInt: encoding = 'I'; break; 3416 case BuiltinType::ULong: 3417 encoding = 3418 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3419 break; 3420 case BuiltinType::UInt128: encoding = 'T'; break; 3421 case BuiltinType::ULongLong: encoding = 'Q'; break; 3422 case BuiltinType::Char_S: 3423 case BuiltinType::SChar: encoding = 'c'; break; 3424 case BuiltinType::Short: encoding = 's'; break; 3425 case BuiltinType::Int: encoding = 'i'; break; 3426 case BuiltinType::Long: 3427 encoding = 3428 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3429 break; 3430 case BuiltinType::LongLong: encoding = 'q'; break; 3431 case BuiltinType::Int128: encoding = 't'; break; 3432 case BuiltinType::Float: encoding = 'f'; break; 3433 case BuiltinType::Double: encoding = 'd'; break; 3434 case BuiltinType::LongDouble: encoding = 'd'; break; 3435 } 3436 3437 S += encoding; 3438 return; 3439 } 3440 3441 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3442 S += 'j'; 3443 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3444 false); 3445 return; 3446 } 3447 3448 if (const PointerType *PT = T->getAs<PointerType>()) { 3449 if (PT->isObjCSelType()) { 3450 S += ':'; 3451 return; 3452 } 3453 QualType PointeeTy = PT->getPointeeType(); 3454 3455 bool isReadOnly = false; 3456 // For historical/compatibility reasons, the read-only qualifier of the 3457 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3458 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3459 // Also, do not emit the 'r' for anything but the outermost type! 3460 if (isa<TypedefType>(T.getTypePtr())) { 3461 if (OutermostType && T.isConstQualified()) { 3462 isReadOnly = true; 3463 S += 'r'; 3464 } 3465 } else if (OutermostType) { 3466 QualType P = PointeeTy; 3467 while (P->getAs<PointerType>()) 3468 P = P->getAs<PointerType>()->getPointeeType(); 3469 if (P.isConstQualified()) { 3470 isReadOnly = true; 3471 S += 'r'; 3472 } 3473 } 3474 if (isReadOnly) { 3475 // Another legacy compatibility encoding. Some ObjC qualifier and type 3476 // combinations need to be rearranged. 3477 // Rewrite "in const" from "nr" to "rn" 3478 const char * s = S.c_str(); 3479 int len = S.length(); 3480 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3481 std::string replace = "rn"; 3482 S.replace(S.end()-2, S.end(), replace); 3483 } 3484 } 3485 3486 if (PointeeTy->isCharType()) { 3487 // char pointer types should be encoded as '*' unless it is a 3488 // type that has been typedef'd to 'BOOL'. 3489 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3490 S += '*'; 3491 return; 3492 } 3493 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3494 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3495 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3496 S += '#'; 3497 return; 3498 } 3499 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3500 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3501 S += '@'; 3502 return; 3503 } 3504 // fall through... 3505 } 3506 S += '^'; 3507 getLegacyIntegralTypeEncoding(PointeeTy); 3508 3509 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3510 NULL); 3511 return; 3512 } 3513 3514 if (const ArrayType *AT = 3515 // Ignore type qualifiers etc. 3516 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3517 if (isa<IncompleteArrayType>(AT)) { 3518 // Incomplete arrays are encoded as a pointer to the array element. 3519 S += '^'; 3520 3521 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3522 false, ExpandStructures, FD); 3523 } else { 3524 S += '['; 3525 3526 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3527 S += llvm::utostr(CAT->getSize().getZExtValue()); 3528 else { 3529 //Variable length arrays are encoded as a regular array with 0 elements. 3530 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3531 S += '0'; 3532 } 3533 3534 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3535 false, ExpandStructures, FD); 3536 S += ']'; 3537 } 3538 return; 3539 } 3540 3541 if (T->getAs<FunctionType>()) { 3542 S += '?'; 3543 return; 3544 } 3545 3546 if (const RecordType *RTy = T->getAs<RecordType>()) { 3547 RecordDecl *RDecl = RTy->getDecl(); 3548 S += RDecl->isUnion() ? '(' : '{'; 3549 // Anonymous structures print as '?' 3550 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3551 S += II->getName(); 3552 } else { 3553 S += '?'; 3554 } 3555 if (ExpandStructures) { 3556 S += '='; 3557 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3558 FieldEnd = RDecl->field_end(); 3559 Field != FieldEnd; ++Field) { 3560 if (FD) { 3561 S += '"'; 3562 S += Field->getNameAsString(); 3563 S += '"'; 3564 } 3565 3566 // Special case bit-fields. 3567 if (Field->isBitField()) { 3568 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3569 (*Field)); 3570 } else { 3571 QualType qt = Field->getType(); 3572 getLegacyIntegralTypeEncoding(qt); 3573 getObjCEncodingForTypeImpl(qt, S, false, true, 3574 FD); 3575 } 3576 } 3577 } 3578 S += RDecl->isUnion() ? ')' : '}'; 3579 return; 3580 } 3581 3582 if (T->isEnumeralType()) { 3583 if (FD && FD->isBitField()) 3584 EncodeBitField(this, S, FD); 3585 else 3586 S += 'i'; 3587 return; 3588 } 3589 3590 if (T->isBlockPointerType()) { 3591 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3592 return; 3593 } 3594 3595 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3596 // @encode(class_name) 3597 ObjCInterfaceDecl *OI = OIT->getDecl(); 3598 S += '{'; 3599 const IdentifierInfo *II = OI->getIdentifier(); 3600 S += II->getName(); 3601 S += '='; 3602 llvm::SmallVector<FieldDecl*, 32> RecFields; 3603 CollectObjCIvars(OI, RecFields); 3604 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3605 if (RecFields[i]->isBitField()) 3606 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3607 RecFields[i]); 3608 else 3609 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3610 FD); 3611 } 3612 S += '}'; 3613 return; 3614 } 3615 3616 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3617 if (OPT->isObjCIdType()) { 3618 S += '@'; 3619 return; 3620 } 3621 3622 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 3623 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 3624 // Since this is a binary compatibility issue, need to consult with runtime 3625 // folks. Fortunately, this is a *very* obsure construct. 3626 S += '#'; 3627 return; 3628 } 3629 3630 if (OPT->isObjCQualifiedIdType()) { 3631 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3632 ExpandPointedToStructures, 3633 ExpandStructures, FD); 3634 if (FD || EncodingProperty) { 3635 // Note that we do extended encoding of protocol qualifer list 3636 // Only when doing ivar or property encoding. 3637 S += '"'; 3638 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3639 E = OPT->qual_end(); I != E; ++I) { 3640 S += '<'; 3641 S += (*I)->getNameAsString(); 3642 S += '>'; 3643 } 3644 S += '"'; 3645 } 3646 return; 3647 } 3648 3649 QualType PointeeTy = OPT->getPointeeType(); 3650 if (!EncodingProperty && 3651 isa<TypedefType>(PointeeTy.getTypePtr())) { 3652 // Another historical/compatibility reason. 3653 // We encode the underlying type which comes out as 3654 // {...}; 3655 S += '^'; 3656 getObjCEncodingForTypeImpl(PointeeTy, S, 3657 false, ExpandPointedToStructures, 3658 NULL); 3659 return; 3660 } 3661 3662 S += '@'; 3663 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 3664 S += '"'; 3665 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 3666 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3667 E = OPT->qual_end(); I != E; ++I) { 3668 S += '<'; 3669 S += (*I)->getNameAsString(); 3670 S += '>'; 3671 } 3672 S += '"'; 3673 } 3674 return; 3675 } 3676 3677 assert(0 && "@encode for type not implemented!"); 3678} 3679 3680void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3681 std::string& S) const { 3682 if (QT & Decl::OBJC_TQ_In) 3683 S += 'n'; 3684 if (QT & Decl::OBJC_TQ_Inout) 3685 S += 'N'; 3686 if (QT & Decl::OBJC_TQ_Out) 3687 S += 'o'; 3688 if (QT & Decl::OBJC_TQ_Bycopy) 3689 S += 'O'; 3690 if (QT & Decl::OBJC_TQ_Byref) 3691 S += 'R'; 3692 if (QT & Decl::OBJC_TQ_Oneway) 3693 S += 'V'; 3694} 3695 3696void ASTContext::setBuiltinVaListType(QualType T) { 3697 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3698 3699 BuiltinVaListType = T; 3700} 3701 3702void ASTContext::setObjCIdType(QualType T) { 3703 ObjCIdTypedefType = T; 3704} 3705 3706void ASTContext::setObjCSelType(QualType T) { 3707 ObjCSelTypedefType = T; 3708} 3709 3710void ASTContext::setObjCProtoType(QualType QT) { 3711 ObjCProtoType = QT; 3712} 3713 3714void ASTContext::setObjCClassType(QualType T) { 3715 ObjCClassTypedefType = T; 3716} 3717 3718void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3719 assert(ObjCConstantStringType.isNull() && 3720 "'NSConstantString' type already set!"); 3721 3722 ObjCConstantStringType = getObjCInterfaceType(Decl); 3723} 3724 3725/// \brief Retrieve the template name that corresponds to a non-empty 3726/// lookup. 3727TemplateName ASTContext::getOverloadedTemplateName(NamedDecl * const *Begin, 3728 NamedDecl * const *End) { 3729 unsigned size = End - Begin; 3730 assert(size > 1 && "set is not overloaded!"); 3731 3732 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 3733 size * sizeof(FunctionTemplateDecl*)); 3734 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 3735 3736 NamedDecl **Storage = OT->getStorage(); 3737 for (NamedDecl * const *I = Begin; I != End; ++I) { 3738 NamedDecl *D = *I; 3739 assert(isa<FunctionTemplateDecl>(D) || 3740 (isa<UsingShadowDecl>(D) && 3741 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 3742 *Storage++ = D; 3743 } 3744 3745 return TemplateName(OT); 3746} 3747 3748/// \brief Retrieve the template name that represents a qualified 3749/// template name such as \c std::vector. 3750TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3751 bool TemplateKeyword, 3752 TemplateDecl *Template) { 3753 llvm::FoldingSetNodeID ID; 3754 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3755 3756 void *InsertPos = 0; 3757 QualifiedTemplateName *QTN = 3758 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3759 if (!QTN) { 3760 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3761 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3762 } 3763 3764 return TemplateName(QTN); 3765} 3766 3767/// \brief Retrieve the template name that represents a dependent 3768/// template name such as \c MetaFun::template apply. 3769TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3770 const IdentifierInfo *Name) { 3771 assert((!NNS || NNS->isDependent()) && 3772 "Nested name specifier must be dependent"); 3773 3774 llvm::FoldingSetNodeID ID; 3775 DependentTemplateName::Profile(ID, NNS, Name); 3776 3777 void *InsertPos = 0; 3778 DependentTemplateName *QTN = 3779 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3780 3781 if (QTN) 3782 return TemplateName(QTN); 3783 3784 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3785 if (CanonNNS == NNS) { 3786 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3787 } else { 3788 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3789 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3790 } 3791 3792 DependentTemplateNames.InsertNode(QTN, InsertPos); 3793 return TemplateName(QTN); 3794} 3795 3796/// \brief Retrieve the template name that represents a dependent 3797/// template name such as \c MetaFun::template operator+. 3798TemplateName 3799ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3800 OverloadedOperatorKind Operator) { 3801 assert((!NNS || NNS->isDependent()) && 3802 "Nested name specifier must be dependent"); 3803 3804 llvm::FoldingSetNodeID ID; 3805 DependentTemplateName::Profile(ID, NNS, Operator); 3806 3807 void *InsertPos = 0; 3808 DependentTemplateName *QTN = 3809 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3810 3811 if (QTN) 3812 return TemplateName(QTN); 3813 3814 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3815 if (CanonNNS == NNS) { 3816 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 3817 } else { 3818 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 3819 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 3820 } 3821 3822 DependentTemplateNames.InsertNode(QTN, InsertPos); 3823 return TemplateName(QTN); 3824} 3825 3826/// getFromTargetType - Given one of the integer types provided by 3827/// TargetInfo, produce the corresponding type. The unsigned @p Type 3828/// is actually a value of type @c TargetInfo::IntType. 3829CanQualType ASTContext::getFromTargetType(unsigned Type) const { 3830 switch (Type) { 3831 case TargetInfo::NoInt: return CanQualType(); 3832 case TargetInfo::SignedShort: return ShortTy; 3833 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3834 case TargetInfo::SignedInt: return IntTy; 3835 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3836 case TargetInfo::SignedLong: return LongTy; 3837 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3838 case TargetInfo::SignedLongLong: return LongLongTy; 3839 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3840 } 3841 3842 assert(false && "Unhandled TargetInfo::IntType value"); 3843 return CanQualType(); 3844} 3845 3846//===----------------------------------------------------------------------===// 3847// Type Predicates. 3848//===----------------------------------------------------------------------===// 3849 3850/// isObjCNSObjectType - Return true if this is an NSObject object using 3851/// NSObject attribute on a c-style pointer type. 3852/// FIXME - Make it work directly on types. 3853/// FIXME: Move to Type. 3854/// 3855bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3856 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3857 if (TypedefDecl *TD = TDT->getDecl()) 3858 if (TD->getAttr<ObjCNSObjectAttr>()) 3859 return true; 3860 } 3861 return false; 3862} 3863 3864/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3865/// garbage collection attribute. 3866/// 3867Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3868 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3869 if (getLangOptions().ObjC1 && 3870 getLangOptions().getGCMode() != LangOptions::NonGC) { 3871 GCAttrs = Ty.getObjCGCAttr(); 3872 // Default behavious under objective-c's gc is for objective-c pointers 3873 // (or pointers to them) be treated as though they were declared 3874 // as __strong. 3875 if (GCAttrs == Qualifiers::GCNone) { 3876 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3877 GCAttrs = Qualifiers::Strong; 3878 else if (Ty->isPointerType()) 3879 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3880 } 3881 // Non-pointers have none gc'able attribute regardless of the attribute 3882 // set on them. 3883 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3884 return Qualifiers::GCNone; 3885 } 3886 return GCAttrs; 3887} 3888 3889//===----------------------------------------------------------------------===// 3890// Type Compatibility Testing 3891//===----------------------------------------------------------------------===// 3892 3893/// areCompatVectorTypes - Return true if the two specified vector types are 3894/// compatible. 3895static bool areCompatVectorTypes(const VectorType *LHS, 3896 const VectorType *RHS) { 3897 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 3898 return LHS->getElementType() == RHS->getElementType() && 3899 LHS->getNumElements() == RHS->getNumElements(); 3900} 3901 3902//===----------------------------------------------------------------------===// 3903// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3904//===----------------------------------------------------------------------===// 3905 3906/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3907/// inheritance hierarchy of 'rProto'. 3908bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3909 ObjCProtocolDecl *rProto) { 3910 if (lProto == rProto) 3911 return true; 3912 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3913 E = rProto->protocol_end(); PI != E; ++PI) 3914 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3915 return true; 3916 return false; 3917} 3918 3919/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3920/// return true if lhs's protocols conform to rhs's protocol; false 3921/// otherwise. 3922bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3923 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3924 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3925 return false; 3926} 3927 3928/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3929/// ObjCQualifiedIDType. 3930bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3931 bool compare) { 3932 // Allow id<P..> and an 'id' or void* type in all cases. 3933 if (lhs->isVoidPointerType() || 3934 lhs->isObjCIdType() || lhs->isObjCClassType()) 3935 return true; 3936 else if (rhs->isVoidPointerType() || 3937 rhs->isObjCIdType() || rhs->isObjCClassType()) 3938 return true; 3939 3940 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3941 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3942 3943 if (!rhsOPT) return false; 3944 3945 if (rhsOPT->qual_empty()) { 3946 // If the RHS is a unqualified interface pointer "NSString*", 3947 // make sure we check the class hierarchy. 3948 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3949 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3950 E = lhsQID->qual_end(); I != E; ++I) { 3951 // when comparing an id<P> on lhs with a static type on rhs, 3952 // see if static class implements all of id's protocols, directly or 3953 // through its super class and categories. 3954 if (!rhsID->ClassImplementsProtocol(*I, true)) 3955 return false; 3956 } 3957 } 3958 // If there are no qualifiers and no interface, we have an 'id'. 3959 return true; 3960 } 3961 // Both the right and left sides have qualifiers. 3962 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3963 E = lhsQID->qual_end(); I != E; ++I) { 3964 ObjCProtocolDecl *lhsProto = *I; 3965 bool match = false; 3966 3967 // when comparing an id<P> on lhs with a static type on rhs, 3968 // see if static class implements all of id's protocols, directly or 3969 // through its super class and categories. 3970 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3971 E = rhsOPT->qual_end(); J != E; ++J) { 3972 ObjCProtocolDecl *rhsProto = *J; 3973 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3974 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3975 match = true; 3976 break; 3977 } 3978 } 3979 // If the RHS is a qualified interface pointer "NSString<P>*", 3980 // make sure we check the class hierarchy. 3981 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3982 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3983 E = lhsQID->qual_end(); I != E; ++I) { 3984 // when comparing an id<P> on lhs with a static type on rhs, 3985 // see if static class implements all of id's protocols, directly or 3986 // through its super class and categories. 3987 if (rhsID->ClassImplementsProtocol(*I, true)) { 3988 match = true; 3989 break; 3990 } 3991 } 3992 } 3993 if (!match) 3994 return false; 3995 } 3996 3997 return true; 3998 } 3999 4000 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 4001 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 4002 4003 if (const ObjCObjectPointerType *lhsOPT = 4004 lhs->getAsObjCInterfacePointerType()) { 4005 if (lhsOPT->qual_empty()) { 4006 bool match = false; 4007 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 4008 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 4009 E = rhsQID->qual_end(); I != E; ++I) { 4010 // when comparing an id<P> on lhs with a static type on rhs, 4011 // see if static class implements all of id's protocols, directly or 4012 // through its super class and categories. 4013 if (lhsID->ClassImplementsProtocol(*I, true)) { 4014 match = true; 4015 break; 4016 } 4017 } 4018 if (!match) 4019 return false; 4020 } 4021 return true; 4022 } 4023 // Both the right and left sides have qualifiers. 4024 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 4025 E = lhsOPT->qual_end(); I != E; ++I) { 4026 ObjCProtocolDecl *lhsProto = *I; 4027 bool match = false; 4028 4029 // when comparing an id<P> on lhs with a static type on rhs, 4030 // see if static class implements all of id's protocols, directly or 4031 // through its super class and categories. 4032 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4033 E = rhsQID->qual_end(); J != E; ++J) { 4034 ObjCProtocolDecl *rhsProto = *J; 4035 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4036 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4037 match = true; 4038 break; 4039 } 4040 } 4041 if (!match) 4042 return false; 4043 } 4044 return true; 4045 } 4046 return false; 4047} 4048 4049/// canAssignObjCInterfaces - Return true if the two interface types are 4050/// compatible for assignment from RHS to LHS. This handles validation of any 4051/// protocol qualifiers on the LHS or RHS. 4052/// 4053bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4054 const ObjCObjectPointerType *RHSOPT) { 4055 // If either type represents the built-in 'id' or 'Class' types, return true. 4056 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 4057 return true; 4058 4059 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4060 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4061 QualType(RHSOPT,0), 4062 false); 4063 4064 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4065 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4066 if (LHS && RHS) // We have 2 user-defined types. 4067 return canAssignObjCInterfaces(LHS, RHS); 4068 4069 return false; 4070} 4071 4072/// getIntersectionOfProtocols - This routine finds the intersection of set 4073/// of protocols inherited from two distinct objective-c pointer objects. 4074/// It is used to build composite qualifier list of the composite type of 4075/// the conditional expression involving two objective-c pointer objects. 4076static 4077void getIntersectionOfProtocols(ASTContext &Context, 4078 const ObjCObjectPointerType *LHSOPT, 4079 const ObjCObjectPointerType *RHSOPT, 4080 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4081 4082 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4083 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4084 4085 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4086 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4087 if (LHSNumProtocols > 0) 4088 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4089 else { 4090 llvm::SmallVector<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4091 Context.CollectInheritedProtocols(LHS->getDecl(), LHSInheritedProtocols); 4092 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4093 LHSInheritedProtocols.end()); 4094 } 4095 4096 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4097 if (RHSNumProtocols > 0) { 4098 ObjCProtocolDecl **RHSProtocols = (ObjCProtocolDecl **)RHS->qual_begin(); 4099 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4100 if (InheritedProtocolSet.count(RHSProtocols[i])) 4101 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4102 } 4103 else { 4104 llvm::SmallVector<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4105 Context.CollectInheritedProtocols(RHS->getDecl(), RHSInheritedProtocols); 4106 // FIXME. This may cause duplication of protocols in the list, but should 4107 // be harmless. 4108 for (unsigned i = 0, len = RHSInheritedProtocols.size(); i < len; ++i) 4109 if (InheritedProtocolSet.count(RHSInheritedProtocols[i])) 4110 IntersectionOfProtocols.push_back(RHSInheritedProtocols[i]); 4111 } 4112} 4113 4114/// areCommonBaseCompatible - Returns common base class of the two classes if 4115/// one found. Note that this is O'2 algorithm. But it will be called as the 4116/// last type comparison in a ?-exp of ObjC pointer types before a 4117/// warning is issued. So, its invokation is extremely rare. 4118QualType ASTContext::areCommonBaseCompatible( 4119 const ObjCObjectPointerType *LHSOPT, 4120 const ObjCObjectPointerType *RHSOPT) { 4121 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4122 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4123 if (!LHS || !RHS) 4124 return QualType(); 4125 4126 while (const ObjCInterfaceDecl *LHSIDecl = LHS->getDecl()->getSuperClass()) { 4127 QualType LHSTy = getObjCInterfaceType(LHSIDecl); 4128 LHS = LHSTy->getAs<ObjCInterfaceType>(); 4129 if (canAssignObjCInterfaces(LHS, RHS)) { 4130 llvm::SmallVector<ObjCProtocolDecl *, 8> IntersectionOfProtocols; 4131 getIntersectionOfProtocols(*this, 4132 LHSOPT, RHSOPT, IntersectionOfProtocols); 4133 if (IntersectionOfProtocols.empty()) 4134 LHSTy = getObjCObjectPointerType(LHSTy); 4135 else 4136 LHSTy = getObjCObjectPointerType(LHSTy, &IntersectionOfProtocols[0], 4137 IntersectionOfProtocols.size()); 4138 return LHSTy; 4139 } 4140 } 4141 4142 return QualType(); 4143} 4144 4145bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 4146 const ObjCInterfaceType *RHS) { 4147 // Verify that the base decls are compatible: the RHS must be a subclass of 4148 // the LHS. 4149 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4150 return false; 4151 4152 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4153 // protocol qualified at all, then we are good. 4154 if (LHS->getNumProtocols() == 0) 4155 return true; 4156 4157 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4158 // isn't a superset. 4159 if (RHS->getNumProtocols() == 0) 4160 return true; // FIXME: should return false! 4161 4162 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 4163 LHSPE = LHS->qual_end(); 4164 LHSPI != LHSPE; LHSPI++) { 4165 bool RHSImplementsProtocol = false; 4166 4167 // If the RHS doesn't implement the protocol on the left, the types 4168 // are incompatible. 4169 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 4170 RHSPE = RHS->qual_end(); 4171 RHSPI != RHSPE; RHSPI++) { 4172 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4173 RHSImplementsProtocol = true; 4174 break; 4175 } 4176 } 4177 // FIXME: For better diagnostics, consider passing back the protocol name. 4178 if (!RHSImplementsProtocol) 4179 return false; 4180 } 4181 // The RHS implements all protocols listed on the LHS. 4182 return true; 4183} 4184 4185bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4186 // get the "pointed to" types 4187 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4188 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4189 4190 if (!LHSOPT || !RHSOPT) 4191 return false; 4192 4193 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4194 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4195} 4196 4197/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4198/// both shall have the identically qualified version of a compatible type. 4199/// C99 6.2.7p1: Two types have compatible types if their types are the 4200/// same. See 6.7.[2,3,5] for additional rules. 4201bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 4202 return !mergeTypes(LHS, RHS).isNull(); 4203} 4204 4205QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 4206 const FunctionType *lbase = lhs->getAs<FunctionType>(); 4207 const FunctionType *rbase = rhs->getAs<FunctionType>(); 4208 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 4209 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 4210 bool allLTypes = true; 4211 bool allRTypes = true; 4212 4213 // Check return type 4214 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 4215 if (retType.isNull()) return QualType(); 4216 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 4217 allLTypes = false; 4218 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 4219 allRTypes = false; 4220 // FIXME: double check this 4221 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 4222 if (NoReturn != lbase->getNoReturnAttr()) 4223 allLTypes = false; 4224 if (NoReturn != rbase->getNoReturnAttr()) 4225 allRTypes = false; 4226 4227 if (lproto && rproto) { // two C99 style function prototypes 4228 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 4229 "C++ shouldn't be here"); 4230 unsigned lproto_nargs = lproto->getNumArgs(); 4231 unsigned rproto_nargs = rproto->getNumArgs(); 4232 4233 // Compatible functions must have the same number of arguments 4234 if (lproto_nargs != rproto_nargs) 4235 return QualType(); 4236 4237 // Variadic and non-variadic functions aren't compatible 4238 if (lproto->isVariadic() != rproto->isVariadic()) 4239 return QualType(); 4240 4241 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 4242 return QualType(); 4243 4244 // Check argument compatibility 4245 llvm::SmallVector<QualType, 10> types; 4246 for (unsigned i = 0; i < lproto_nargs; i++) { 4247 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 4248 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 4249 QualType argtype = mergeTypes(largtype, rargtype); 4250 if (argtype.isNull()) return QualType(); 4251 types.push_back(argtype); 4252 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 4253 allLTypes = false; 4254 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 4255 allRTypes = false; 4256 } 4257 if (allLTypes) return lhs; 4258 if (allRTypes) return rhs; 4259 return getFunctionType(retType, types.begin(), types.size(), 4260 lproto->isVariadic(), lproto->getTypeQuals(), 4261 NoReturn); 4262 } 4263 4264 if (lproto) allRTypes = false; 4265 if (rproto) allLTypes = false; 4266 4267 const FunctionProtoType *proto = lproto ? lproto : rproto; 4268 if (proto) { 4269 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 4270 if (proto->isVariadic()) return QualType(); 4271 // Check that the types are compatible with the types that 4272 // would result from default argument promotions (C99 6.7.5.3p15). 4273 // The only types actually affected are promotable integer 4274 // types and floats, which would be passed as a different 4275 // type depending on whether the prototype is visible. 4276 unsigned proto_nargs = proto->getNumArgs(); 4277 for (unsigned i = 0; i < proto_nargs; ++i) { 4278 QualType argTy = proto->getArgType(i); 4279 if (argTy->isPromotableIntegerType() || 4280 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 4281 return QualType(); 4282 } 4283 4284 if (allLTypes) return lhs; 4285 if (allRTypes) return rhs; 4286 return getFunctionType(retType, proto->arg_type_begin(), 4287 proto->getNumArgs(), proto->isVariadic(), 4288 proto->getTypeQuals(), NoReturn); 4289 } 4290 4291 if (allLTypes) return lhs; 4292 if (allRTypes) return rhs; 4293 return getFunctionNoProtoType(retType, NoReturn); 4294} 4295 4296QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 4297 // C++ [expr]: If an expression initially has the type "reference to T", the 4298 // type is adjusted to "T" prior to any further analysis, the expression 4299 // designates the object or function denoted by the reference, and the 4300 // expression is an lvalue unless the reference is an rvalue reference and 4301 // the expression is a function call (possibly inside parentheses). 4302 // FIXME: C++ shouldn't be going through here! The rules are different 4303 // enough that they should be handled separately. 4304 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 4305 // shouldn't be going through here! 4306 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 4307 LHS = RT->getPointeeType(); 4308 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 4309 RHS = RT->getPointeeType(); 4310 4311 QualType LHSCan = getCanonicalType(LHS), 4312 RHSCan = getCanonicalType(RHS); 4313 4314 // If two types are identical, they are compatible. 4315 if (LHSCan == RHSCan) 4316 return LHS; 4317 4318 // If the qualifiers are different, the types aren't compatible... mostly. 4319 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 4320 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 4321 if (LQuals != RQuals) { 4322 // If any of these qualifiers are different, we have a type 4323 // mismatch. 4324 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 4325 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 4326 return QualType(); 4327 4328 // Exactly one GC qualifier difference is allowed: __strong is 4329 // okay if the other type has no GC qualifier but is an Objective 4330 // C object pointer (i.e. implicitly strong by default). We fix 4331 // this by pretending that the unqualified type was actually 4332 // qualified __strong. 4333 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 4334 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 4335 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 4336 4337 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 4338 return QualType(); 4339 4340 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 4341 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 4342 } 4343 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 4344 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 4345 } 4346 return QualType(); 4347 } 4348 4349 // Okay, qualifiers are equal. 4350 4351 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 4352 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 4353 4354 // We want to consider the two function types to be the same for these 4355 // comparisons, just force one to the other. 4356 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 4357 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 4358 4359 // Same as above for arrays 4360 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 4361 LHSClass = Type::ConstantArray; 4362 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 4363 RHSClass = Type::ConstantArray; 4364 4365 // Canonicalize ExtVector -> Vector. 4366 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 4367 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 4368 4369 // If the canonical type classes don't match. 4370 if (LHSClass != RHSClass) { 4371 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 4372 // a signed integer type, or an unsigned integer type. 4373 // Compatibility is based on the underlying type, not the promotion 4374 // type. 4375 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 4376 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 4377 return RHS; 4378 } 4379 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 4380 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 4381 return LHS; 4382 } 4383 4384 return QualType(); 4385 } 4386 4387 // The canonical type classes match. 4388 switch (LHSClass) { 4389#define TYPE(Class, Base) 4390#define ABSTRACT_TYPE(Class, Base) 4391#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4392#define DEPENDENT_TYPE(Class, Base) case Type::Class: 4393#include "clang/AST/TypeNodes.def" 4394 assert(false && "Non-canonical and dependent types shouldn't get here"); 4395 return QualType(); 4396 4397 case Type::LValueReference: 4398 case Type::RValueReference: 4399 case Type::MemberPointer: 4400 assert(false && "C++ should never be in mergeTypes"); 4401 return QualType(); 4402 4403 case Type::IncompleteArray: 4404 case Type::VariableArray: 4405 case Type::FunctionProto: 4406 case Type::ExtVector: 4407 assert(false && "Types are eliminated above"); 4408 return QualType(); 4409 4410 case Type::Pointer: 4411 { 4412 // Merge two pointer types, while trying to preserve typedef info 4413 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 4414 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 4415 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4416 if (ResultType.isNull()) return QualType(); 4417 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4418 return LHS; 4419 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4420 return RHS; 4421 return getPointerType(ResultType); 4422 } 4423 case Type::BlockPointer: 4424 { 4425 // Merge two block pointer types, while trying to preserve typedef info 4426 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 4427 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 4428 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4429 if (ResultType.isNull()) return QualType(); 4430 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4431 return LHS; 4432 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4433 return RHS; 4434 return getBlockPointerType(ResultType); 4435 } 4436 case Type::ConstantArray: 4437 { 4438 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 4439 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 4440 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 4441 return QualType(); 4442 4443 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 4444 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 4445 QualType ResultType = mergeTypes(LHSElem, RHSElem); 4446 if (ResultType.isNull()) return QualType(); 4447 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4448 return LHS; 4449 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4450 return RHS; 4451 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 4452 ArrayType::ArraySizeModifier(), 0); 4453 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 4454 ArrayType::ArraySizeModifier(), 0); 4455 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 4456 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 4457 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4458 return LHS; 4459 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4460 return RHS; 4461 if (LVAT) { 4462 // FIXME: This isn't correct! But tricky to implement because 4463 // the array's size has to be the size of LHS, but the type 4464 // has to be different. 4465 return LHS; 4466 } 4467 if (RVAT) { 4468 // FIXME: This isn't correct! But tricky to implement because 4469 // the array's size has to be the size of RHS, but the type 4470 // has to be different. 4471 return RHS; 4472 } 4473 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4474 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4475 return getIncompleteArrayType(ResultType, 4476 ArrayType::ArraySizeModifier(), 0); 4477 } 4478 case Type::FunctionNoProto: 4479 return mergeFunctionTypes(LHS, RHS); 4480 case Type::Record: 4481 case Type::Enum: 4482 return QualType(); 4483 case Type::Builtin: 4484 // Only exactly equal builtin types are compatible, which is tested above. 4485 return QualType(); 4486 case Type::Complex: 4487 // Distinct complex types are incompatible. 4488 return QualType(); 4489 case Type::Vector: 4490 // FIXME: The merged type should be an ExtVector! 4491 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 4492 return LHS; 4493 return QualType(); 4494 case Type::ObjCInterface: { 4495 // Check if the interfaces are assignment compatible. 4496 // FIXME: This should be type compatibility, e.g. whether 4497 // "LHS x; RHS x;" at global scope is legal. 4498 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 4499 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 4500 if (LHSIface && RHSIface && 4501 canAssignObjCInterfaces(LHSIface, RHSIface)) 4502 return LHS; 4503 4504 return QualType(); 4505 } 4506 case Type::ObjCObjectPointer: { 4507 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4508 RHS->getAs<ObjCObjectPointerType>())) 4509 return LHS; 4510 4511 return QualType(); 4512 } 4513 case Type::FixedWidthInt: 4514 // Distinct fixed-width integers are not compatible. 4515 return QualType(); 4516 case Type::TemplateSpecialization: 4517 assert(false && "Dependent types have no size"); 4518 break; 4519 } 4520 4521 return QualType(); 4522} 4523 4524//===----------------------------------------------------------------------===// 4525// Integer Predicates 4526//===----------------------------------------------------------------------===// 4527 4528unsigned ASTContext::getIntWidth(QualType T) { 4529 if (T->isBooleanType()) 4530 return 1; 4531 if (FixedWidthIntType *FWIT = dyn_cast<FixedWidthIntType>(T)) { 4532 return FWIT->getWidth(); 4533 } 4534 if (EnumType *ET = dyn_cast<EnumType>(T)) 4535 T = ET->getDecl()->getIntegerType(); 4536 // For builtin types, just use the standard type sizing method 4537 return (unsigned)getTypeSize(T); 4538} 4539 4540QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4541 assert(T->isSignedIntegerType() && "Unexpected type"); 4542 4543 // Turn <4 x signed int> -> <4 x unsigned int> 4544 if (const VectorType *VTy = T->getAs<VectorType>()) 4545 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4546 VTy->getNumElements()); 4547 4548 // For enums, we return the unsigned version of the base type. 4549 if (const EnumType *ETy = T->getAs<EnumType>()) 4550 T = ETy->getDecl()->getIntegerType(); 4551 4552 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4553 assert(BTy && "Unexpected signed integer type"); 4554 switch (BTy->getKind()) { 4555 case BuiltinType::Char_S: 4556 case BuiltinType::SChar: 4557 return UnsignedCharTy; 4558 case BuiltinType::Short: 4559 return UnsignedShortTy; 4560 case BuiltinType::Int: 4561 return UnsignedIntTy; 4562 case BuiltinType::Long: 4563 return UnsignedLongTy; 4564 case BuiltinType::LongLong: 4565 return UnsignedLongLongTy; 4566 case BuiltinType::Int128: 4567 return UnsignedInt128Ty; 4568 default: 4569 assert(0 && "Unexpected signed integer type"); 4570 return QualType(); 4571 } 4572} 4573 4574ExternalASTSource::~ExternalASTSource() { } 4575 4576void ExternalASTSource::PrintStats() { } 4577 4578 4579//===----------------------------------------------------------------------===// 4580// Builtin Type Computation 4581//===----------------------------------------------------------------------===// 4582 4583/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4584/// pointer over the consumed characters. This returns the resultant type. 4585static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4586 ASTContext::GetBuiltinTypeError &Error, 4587 bool AllowTypeModifiers = true) { 4588 // Modifiers. 4589 int HowLong = 0; 4590 bool Signed = false, Unsigned = false; 4591 4592 // Read the modifiers first. 4593 bool Done = false; 4594 while (!Done) { 4595 switch (*Str++) { 4596 default: Done = true; --Str; break; 4597 case 'S': 4598 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4599 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4600 Signed = true; 4601 break; 4602 case 'U': 4603 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4604 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4605 Unsigned = true; 4606 break; 4607 case 'L': 4608 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4609 ++HowLong; 4610 break; 4611 } 4612 } 4613 4614 QualType Type; 4615 4616 // Read the base type. 4617 switch (*Str++) { 4618 default: assert(0 && "Unknown builtin type letter!"); 4619 case 'v': 4620 assert(HowLong == 0 && !Signed && !Unsigned && 4621 "Bad modifiers used with 'v'!"); 4622 Type = Context.VoidTy; 4623 break; 4624 case 'f': 4625 assert(HowLong == 0 && !Signed && !Unsigned && 4626 "Bad modifiers used with 'f'!"); 4627 Type = Context.FloatTy; 4628 break; 4629 case 'd': 4630 assert(HowLong < 2 && !Signed && !Unsigned && 4631 "Bad modifiers used with 'd'!"); 4632 if (HowLong) 4633 Type = Context.LongDoubleTy; 4634 else 4635 Type = Context.DoubleTy; 4636 break; 4637 case 's': 4638 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4639 if (Unsigned) 4640 Type = Context.UnsignedShortTy; 4641 else 4642 Type = Context.ShortTy; 4643 break; 4644 case 'i': 4645 if (HowLong == 3) 4646 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4647 else if (HowLong == 2) 4648 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4649 else if (HowLong == 1) 4650 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4651 else 4652 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4653 break; 4654 case 'c': 4655 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4656 if (Signed) 4657 Type = Context.SignedCharTy; 4658 else if (Unsigned) 4659 Type = Context.UnsignedCharTy; 4660 else 4661 Type = Context.CharTy; 4662 break; 4663 case 'b': // boolean 4664 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4665 Type = Context.BoolTy; 4666 break; 4667 case 'z': // size_t. 4668 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4669 Type = Context.getSizeType(); 4670 break; 4671 case 'F': 4672 Type = Context.getCFConstantStringType(); 4673 break; 4674 case 'a': 4675 Type = Context.getBuiltinVaListType(); 4676 assert(!Type.isNull() && "builtin va list type not initialized!"); 4677 break; 4678 case 'A': 4679 // This is a "reference" to a va_list; however, what exactly 4680 // this means depends on how va_list is defined. There are two 4681 // different kinds of va_list: ones passed by value, and ones 4682 // passed by reference. An example of a by-value va_list is 4683 // x86, where va_list is a char*. An example of by-ref va_list 4684 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4685 // we want this argument to be a char*&; for x86-64, we want 4686 // it to be a __va_list_tag*. 4687 Type = Context.getBuiltinVaListType(); 4688 assert(!Type.isNull() && "builtin va list type not initialized!"); 4689 if (Type->isArrayType()) { 4690 Type = Context.getArrayDecayedType(Type); 4691 } else { 4692 Type = Context.getLValueReferenceType(Type); 4693 } 4694 break; 4695 case 'V': { 4696 char *End; 4697 unsigned NumElements = strtoul(Str, &End, 10); 4698 assert(End != Str && "Missing vector size"); 4699 4700 Str = End; 4701 4702 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4703 Type = Context.getVectorType(ElementType, NumElements); 4704 break; 4705 } 4706 case 'X': { 4707 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4708 Type = Context.getComplexType(ElementType); 4709 break; 4710 } 4711 case 'P': 4712 Type = Context.getFILEType(); 4713 if (Type.isNull()) { 4714 Error = ASTContext::GE_Missing_stdio; 4715 return QualType(); 4716 } 4717 break; 4718 case 'J': 4719 if (Signed) 4720 Type = Context.getsigjmp_bufType(); 4721 else 4722 Type = Context.getjmp_bufType(); 4723 4724 if (Type.isNull()) { 4725 Error = ASTContext::GE_Missing_setjmp; 4726 return QualType(); 4727 } 4728 break; 4729 } 4730 4731 if (!AllowTypeModifiers) 4732 return Type; 4733 4734 Done = false; 4735 while (!Done) { 4736 switch (*Str++) { 4737 default: Done = true; --Str; break; 4738 case '*': 4739 Type = Context.getPointerType(Type); 4740 break; 4741 case '&': 4742 Type = Context.getLValueReferenceType(Type); 4743 break; 4744 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4745 case 'C': 4746 Type = Type.withConst(); 4747 break; 4748 } 4749 } 4750 4751 return Type; 4752} 4753 4754/// GetBuiltinType - Return the type for the specified builtin. 4755QualType ASTContext::GetBuiltinType(unsigned id, 4756 GetBuiltinTypeError &Error) { 4757 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4758 4759 llvm::SmallVector<QualType, 8> ArgTypes; 4760 4761 Error = GE_None; 4762 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4763 if (Error != GE_None) 4764 return QualType(); 4765 while (TypeStr[0] && TypeStr[0] != '.') { 4766 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4767 if (Error != GE_None) 4768 return QualType(); 4769 4770 // Do array -> pointer decay. The builtin should use the decayed type. 4771 if (Ty->isArrayType()) 4772 Ty = getArrayDecayedType(Ty); 4773 4774 ArgTypes.push_back(Ty); 4775 } 4776 4777 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4778 "'.' should only occur at end of builtin type list!"); 4779 4780 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4781 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4782 return getFunctionNoProtoType(ResType); 4783 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4784 TypeStr[0] == '.', 0); 4785} 4786 4787QualType 4788ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4789 // Perform the usual unary conversions. We do this early so that 4790 // integral promotions to "int" can allow us to exit early, in the 4791 // lhs == rhs check. Also, for conversion purposes, we ignore any 4792 // qualifiers. For example, "const float" and "float" are 4793 // equivalent. 4794 if (lhs->isPromotableIntegerType()) 4795 lhs = getPromotedIntegerType(lhs); 4796 else 4797 lhs = lhs.getUnqualifiedType(); 4798 if (rhs->isPromotableIntegerType()) 4799 rhs = getPromotedIntegerType(rhs); 4800 else 4801 rhs = rhs.getUnqualifiedType(); 4802 4803 // If both types are identical, no conversion is needed. 4804 if (lhs == rhs) 4805 return lhs; 4806 4807 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4808 // The caller can deal with this (e.g. pointer + int). 4809 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4810 return lhs; 4811 4812 // At this point, we have two different arithmetic types. 4813 4814 // Handle complex types first (C99 6.3.1.8p1). 4815 if (lhs->isComplexType() || rhs->isComplexType()) { 4816 // if we have an integer operand, the result is the complex type. 4817 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4818 // convert the rhs to the lhs complex type. 4819 return lhs; 4820 } 4821 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4822 // convert the lhs to the rhs complex type. 4823 return rhs; 4824 } 4825 // This handles complex/complex, complex/float, or float/complex. 4826 // When both operands are complex, the shorter operand is converted to the 4827 // type of the longer, and that is the type of the result. This corresponds 4828 // to what is done when combining two real floating-point operands. 4829 // The fun begins when size promotion occur across type domains. 4830 // From H&S 6.3.4: When one operand is complex and the other is a real 4831 // floating-point type, the less precise type is converted, within it's 4832 // real or complex domain, to the precision of the other type. For example, 4833 // when combining a "long double" with a "double _Complex", the 4834 // "double _Complex" is promoted to "long double _Complex". 4835 int result = getFloatingTypeOrder(lhs, rhs); 4836 4837 if (result > 0) { // The left side is bigger, convert rhs. 4838 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4839 } else if (result < 0) { // The right side is bigger, convert lhs. 4840 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4841 } 4842 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4843 // domains match. This is a requirement for our implementation, C99 4844 // does not require this promotion. 4845 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4846 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4847 return rhs; 4848 } else { // handle "_Complex double, double". 4849 return lhs; 4850 } 4851 } 4852 return lhs; // The domain/size match exactly. 4853 } 4854 // Now handle "real" floating types (i.e. float, double, long double). 4855 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4856 // if we have an integer operand, the result is the real floating type. 4857 if (rhs->isIntegerType()) { 4858 // convert rhs to the lhs floating point type. 4859 return lhs; 4860 } 4861 if (rhs->isComplexIntegerType()) { 4862 // convert rhs to the complex floating point type. 4863 return getComplexType(lhs); 4864 } 4865 if (lhs->isIntegerType()) { 4866 // convert lhs to the rhs floating point type. 4867 return rhs; 4868 } 4869 if (lhs->isComplexIntegerType()) { 4870 // convert lhs to the complex floating point type. 4871 return getComplexType(rhs); 4872 } 4873 // We have two real floating types, float/complex combos were handled above. 4874 // Convert the smaller operand to the bigger result. 4875 int result = getFloatingTypeOrder(lhs, rhs); 4876 if (result > 0) // convert the rhs 4877 return lhs; 4878 assert(result < 0 && "illegal float comparison"); 4879 return rhs; // convert the lhs 4880 } 4881 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4882 // Handle GCC complex int extension. 4883 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4884 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4885 4886 if (lhsComplexInt && rhsComplexInt) { 4887 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4888 rhsComplexInt->getElementType()) >= 0) 4889 return lhs; // convert the rhs 4890 return rhs; 4891 } else if (lhsComplexInt && rhs->isIntegerType()) { 4892 // convert the rhs to the lhs complex type. 4893 return lhs; 4894 } else if (rhsComplexInt && lhs->isIntegerType()) { 4895 // convert the lhs to the rhs complex type. 4896 return rhs; 4897 } 4898 } 4899 // Finally, we have two differing integer types. 4900 // The rules for this case are in C99 6.3.1.8 4901 int compare = getIntegerTypeOrder(lhs, rhs); 4902 bool lhsSigned = lhs->isSignedIntegerType(), 4903 rhsSigned = rhs->isSignedIntegerType(); 4904 QualType destType; 4905 if (lhsSigned == rhsSigned) { 4906 // Same signedness; use the higher-ranked type 4907 destType = compare >= 0 ? lhs : rhs; 4908 } else if (compare != (lhsSigned ? 1 : -1)) { 4909 // The unsigned type has greater than or equal rank to the 4910 // signed type, so use the unsigned type 4911 destType = lhsSigned ? rhs : lhs; 4912 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4913 // The two types are different widths; if we are here, that 4914 // means the signed type is larger than the unsigned type, so 4915 // use the signed type. 4916 destType = lhsSigned ? lhs : rhs; 4917 } else { 4918 // The signed type is higher-ranked than the unsigned type, 4919 // but isn't actually any bigger (like unsigned int and long 4920 // on most 32-bit systems). Use the unsigned type corresponding 4921 // to the signed type. 4922 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4923 } 4924 return destType; 4925} 4926