ASTContext.cpp revision aa8741a1db98eef05f09b1200dba94aa5dc3bc3d
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 if (FreeMemory) { 60 // Deallocate all the types. 61 while (!Types.empty()) { 62 Types.back()->Destroy(*this); 63 Types.pop_back(); 64 } 65 66 for (llvm::FoldingSet<ExtQuals>::iterator 67 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); I != E; ) { 68 // Increment in loop to prevent using deallocated memory. 69 Deallocate(&*I++); 70 } 71 } 72 73 for (llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 74 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); I != E; ) { 75 // Increment in loop to prevent using deallocated memory. 76 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 77 delete R; 78 } 79 80 for (llvm::DenseMap<const ObjCContainerDecl*, 81 const ASTRecordLayout*>::iterator 82 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); I != E; ) { 83 // Increment in loop to prevent using deallocated memory. 84 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 85 delete R; 86 } 87 88 // Destroy nested-name-specifiers. 89 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 90 NNS = NestedNameSpecifiers.begin(), 91 NNSEnd = NestedNameSpecifiers.end(); 92 NNS != NNSEnd; ) { 93 // Increment in loop to prevent using deallocated memory. 94 (*NNS++).Destroy(*this); 95 } 96 97 if (GlobalNestedNameSpecifier) 98 GlobalNestedNameSpecifier->Destroy(*this); 99 100 TUDecl->Destroy(*this); 101} 102 103void 104ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 105 ExternalSource.reset(Source.take()); 106} 107 108void ASTContext::PrintStats() const { 109 fprintf(stderr, "*** AST Context Stats:\n"); 110 fprintf(stderr, " %d types total.\n", (int)Types.size()); 111 112 unsigned counts[] = { 113#define TYPE(Name, Parent) 0, 114#define ABSTRACT_TYPE(Name, Parent) 115#include "clang/AST/TypeNodes.def" 116 0 // Extra 117 }; 118 119 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 120 Type *T = Types[i]; 121 counts[(unsigned)T->getTypeClass()]++; 122 } 123 124 unsigned Idx = 0; 125 unsigned TotalBytes = 0; 126#define TYPE(Name, Parent) \ 127 if (counts[Idx]) \ 128 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 129 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 130 ++Idx; 131#define ABSTRACT_TYPE(Name, Parent) 132#include "clang/AST/TypeNodes.def" 133 134 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 135 136 if (ExternalSource.get()) { 137 fprintf(stderr, "\n"); 138 ExternalSource->PrintStats(); 139 } 140} 141 142 143void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 144 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 145 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 146 Types.push_back(Ty); 147} 148 149void ASTContext::InitBuiltinTypes() { 150 assert(VoidTy.isNull() && "Context reinitialized?"); 151 152 // C99 6.2.5p19. 153 InitBuiltinType(VoidTy, BuiltinType::Void); 154 155 // C99 6.2.5p2. 156 InitBuiltinType(BoolTy, BuiltinType::Bool); 157 // C99 6.2.5p3. 158 if (LangOpts.CharIsSigned) 159 InitBuiltinType(CharTy, BuiltinType::Char_S); 160 else 161 InitBuiltinType(CharTy, BuiltinType::Char_U); 162 // C99 6.2.5p4. 163 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 164 InitBuiltinType(ShortTy, BuiltinType::Short); 165 InitBuiltinType(IntTy, BuiltinType::Int); 166 InitBuiltinType(LongTy, BuiltinType::Long); 167 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 168 169 // C99 6.2.5p6. 170 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 171 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 172 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 173 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 174 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 175 176 // C99 6.2.5p10. 177 InitBuiltinType(FloatTy, BuiltinType::Float); 178 InitBuiltinType(DoubleTy, BuiltinType::Double); 179 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 180 181 // GNU extension, 128-bit integers. 182 InitBuiltinType(Int128Ty, BuiltinType::Int128); 183 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 184 185 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 186 InitBuiltinType(WCharTy, BuiltinType::WChar); 187 else // C99 188 WCharTy = getFromTargetType(Target.getWCharType()); 189 190 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 191 InitBuiltinType(Char16Ty, BuiltinType::Char16); 192 else // C99 193 Char16Ty = getFromTargetType(Target.getChar16Type()); 194 195 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 196 InitBuiltinType(Char32Ty, BuiltinType::Char32); 197 else // C99 198 Char32Ty = getFromTargetType(Target.getChar32Type()); 199 200 // Placeholder type for functions. 201 InitBuiltinType(OverloadTy, BuiltinType::Overload); 202 203 // Placeholder type for type-dependent expressions whose type is 204 // completely unknown. No code should ever check a type against 205 // DependentTy and users should never see it; however, it is here to 206 // help diagnose failures to properly check for type-dependent 207 // expressions. 208 InitBuiltinType(DependentTy, BuiltinType::Dependent); 209 210 // Placeholder type for C++0x auto declarations whose real type has 211 // not yet been deduced. 212 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 213 214 // C99 6.2.5p11. 215 FloatComplexTy = getComplexType(FloatTy); 216 DoubleComplexTy = getComplexType(DoubleTy); 217 LongDoubleComplexTy = getComplexType(LongDoubleTy); 218 219 BuiltinVaListType = QualType(); 220 221 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 222 ObjCIdTypedefType = QualType(); 223 ObjCClassTypedefType = QualType(); 224 ObjCSelTypedefType = QualType(); 225 226 // Builtin types for 'id', 'Class', and 'SEL'. 227 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 228 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 229 InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel); 230 231 ObjCConstantStringType = QualType(); 232 233 // void * type 234 VoidPtrTy = getPointerType(VoidTy); 235 236 // nullptr type (C++0x 2.14.7) 237 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 238} 239 240MemberSpecializationInfo * 241ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 242 assert(Var->isStaticDataMember() && "Not a static data member"); 243 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 244 = InstantiatedFromStaticDataMember.find(Var); 245 if (Pos == InstantiatedFromStaticDataMember.end()) 246 return 0; 247 248 return Pos->second; 249} 250 251void 252ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 253 TemplateSpecializationKind TSK) { 254 assert(Inst->isStaticDataMember() && "Not a static data member"); 255 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 256 assert(!InstantiatedFromStaticDataMember[Inst] && 257 "Already noted what static data member was instantiated from"); 258 InstantiatedFromStaticDataMember[Inst] 259 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 260} 261 262NamedDecl * 263ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) { 264 llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos 265 = InstantiatedFromUsingDecl.find(UUD); 266 if (Pos == InstantiatedFromUsingDecl.end()) 267 return 0; 268 269 return Pos->second; 270} 271 272void 273ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) { 274 assert((isa<UsingDecl>(Pattern) || 275 isa<UnresolvedUsingValueDecl>(Pattern) || 276 isa<UnresolvedUsingTypenameDecl>(Pattern)) && 277 "pattern decl is not a using decl"); 278 assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists"); 279 InstantiatedFromUsingDecl[Inst] = Pattern; 280} 281 282UsingShadowDecl * 283ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) { 284 llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos 285 = InstantiatedFromUsingShadowDecl.find(Inst); 286 if (Pos == InstantiatedFromUsingShadowDecl.end()) 287 return 0; 288 289 return Pos->second; 290} 291 292void 293ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst, 294 UsingShadowDecl *Pattern) { 295 assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists"); 296 InstantiatedFromUsingShadowDecl[Inst] = Pattern; 297} 298 299FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 300 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 301 = InstantiatedFromUnnamedFieldDecl.find(Field); 302 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 303 return 0; 304 305 return Pos->second; 306} 307 308void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 309 FieldDecl *Tmpl) { 310 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 311 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 312 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 313 "Already noted what unnamed field was instantiated from"); 314 315 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 316} 317 318namespace { 319 class BeforeInTranslationUnit 320 : std::binary_function<SourceRange, SourceRange, bool> { 321 SourceManager *SourceMgr; 322 323 public: 324 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 325 326 bool operator()(SourceRange X, SourceRange Y) { 327 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 328 } 329 }; 330} 331 332/// \brief Determine whether the given comment is a Doxygen-style comment. 333/// 334/// \param Start the start of the comment text. 335/// 336/// \param End the end of the comment text. 337/// 338/// \param Member whether we want to check whether this is a member comment 339/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 340/// we only return true when we find a non-member comment. 341static bool 342isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 343 bool Member = false) { 344 const char *BufferStart 345 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 346 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 347 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 348 349 if (End - Start < 4) 350 return false; 351 352 assert(Start[0] == '/' && "Not a comment?"); 353 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 354 return false; 355 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 356 return false; 357 358 return (Start[3] == '<') == Member; 359} 360 361/// \brief Retrieve the comment associated with the given declaration, if 362/// it has one. 363const char *ASTContext::getCommentForDecl(const Decl *D) { 364 if (!D) 365 return 0; 366 367 // Check whether we have cached a comment string for this declaration 368 // already. 369 llvm::DenseMap<const Decl *, std::string>::iterator Pos 370 = DeclComments.find(D); 371 if (Pos != DeclComments.end()) 372 return Pos->second.c_str(); 373 374 // If we have an external AST source and have not yet loaded comments from 375 // that source, do so now. 376 if (ExternalSource && !LoadedExternalComments) { 377 std::vector<SourceRange> LoadedComments; 378 ExternalSource->ReadComments(LoadedComments); 379 380 if (!LoadedComments.empty()) 381 Comments.insert(Comments.begin(), LoadedComments.begin(), 382 LoadedComments.end()); 383 384 LoadedExternalComments = true; 385 } 386 387 // If there are no comments anywhere, we won't find anything. 388 if (Comments.empty()) 389 return 0; 390 391 // If the declaration doesn't map directly to a location in a file, we 392 // can't find the comment. 393 SourceLocation DeclStartLoc = D->getLocStart(); 394 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 395 return 0; 396 397 // Find the comment that occurs just before this declaration. 398 std::vector<SourceRange>::iterator LastComment 399 = std::lower_bound(Comments.begin(), Comments.end(), 400 SourceRange(DeclStartLoc), 401 BeforeInTranslationUnit(&SourceMgr)); 402 403 // Decompose the location for the start of the declaration and find the 404 // beginning of the file buffer. 405 std::pair<FileID, unsigned> DeclStartDecomp 406 = SourceMgr.getDecomposedLoc(DeclStartLoc); 407 const char *FileBufferStart 408 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 409 410 // First check whether we have a comment for a member. 411 if (LastComment != Comments.end() && 412 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 413 isDoxygenComment(SourceMgr, *LastComment, true)) { 414 std::pair<FileID, unsigned> LastCommentEndDecomp 415 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 416 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 417 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 418 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 419 LastCommentEndDecomp.second)) { 420 // The Doxygen member comment comes after the declaration starts and 421 // is on the same line and in the same file as the declaration. This 422 // is the comment we want. 423 std::string &Result = DeclComments[D]; 424 Result.append(FileBufferStart + 425 SourceMgr.getFileOffset(LastComment->getBegin()), 426 FileBufferStart + LastCommentEndDecomp.second + 1); 427 return Result.c_str(); 428 } 429 } 430 431 if (LastComment == Comments.begin()) 432 return 0; 433 --LastComment; 434 435 // Decompose the end of the comment. 436 std::pair<FileID, unsigned> LastCommentEndDecomp 437 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 438 439 // If the comment and the declaration aren't in the same file, then they 440 // aren't related. 441 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 442 return 0; 443 444 // Check that we actually have a Doxygen comment. 445 if (!isDoxygenComment(SourceMgr, *LastComment)) 446 return 0; 447 448 // Compute the starting line for the declaration and for the end of the 449 // comment (this is expensive). 450 unsigned DeclStartLine 451 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 452 unsigned CommentEndLine 453 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 454 LastCommentEndDecomp.second); 455 456 // If the comment does not end on the line prior to the declaration, then 457 // the comment is not associated with the declaration at all. 458 if (CommentEndLine + 1 != DeclStartLine) 459 return 0; 460 461 // We have a comment, but there may be more comments on the previous lines. 462 // Keep looking so long as the comments are still Doxygen comments and are 463 // still adjacent. 464 unsigned ExpectedLine 465 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 466 std::vector<SourceRange>::iterator FirstComment = LastComment; 467 while (FirstComment != Comments.begin()) { 468 // Look at the previous comment 469 --FirstComment; 470 std::pair<FileID, unsigned> Decomp 471 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 472 473 // If this previous comment is in a different file, we're done. 474 if (Decomp.first != DeclStartDecomp.first) { 475 ++FirstComment; 476 break; 477 } 478 479 // If this comment is not a Doxygen comment, we're done. 480 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 481 ++FirstComment; 482 break; 483 } 484 485 // If the line number is not what we expected, we're done. 486 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 487 if (Line != ExpectedLine) { 488 ++FirstComment; 489 break; 490 } 491 492 // Set the next expected line number. 493 ExpectedLine 494 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 495 } 496 497 // The iterator range [FirstComment, LastComment] contains all of the 498 // BCPL comments that, together, are associated with this declaration. 499 // Form a single comment block string for this declaration that concatenates 500 // all of these comments. 501 std::string &Result = DeclComments[D]; 502 while (FirstComment != LastComment) { 503 std::pair<FileID, unsigned> DecompStart 504 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 505 std::pair<FileID, unsigned> DecompEnd 506 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 507 Result.append(FileBufferStart + DecompStart.second, 508 FileBufferStart + DecompEnd.second + 1); 509 ++FirstComment; 510 } 511 512 // Append the last comment line. 513 Result.append(FileBufferStart + 514 SourceMgr.getFileOffset(LastComment->getBegin()), 515 FileBufferStart + LastCommentEndDecomp.second + 1); 516 return Result.c_str(); 517} 518 519//===----------------------------------------------------------------------===// 520// Type Sizing and Analysis 521//===----------------------------------------------------------------------===// 522 523/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 524/// scalar floating point type. 525const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 526 const BuiltinType *BT = T->getAs<BuiltinType>(); 527 assert(BT && "Not a floating point type!"); 528 switch (BT->getKind()) { 529 default: assert(0 && "Not a floating point type!"); 530 case BuiltinType::Float: return Target.getFloatFormat(); 531 case BuiltinType::Double: return Target.getDoubleFormat(); 532 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 533 } 534} 535 536/// getDeclAlignInBytes - Return a conservative estimate of the alignment of the 537/// specified decl. Note that bitfields do not have a valid alignment, so 538/// this method will assert on them. 539/// If @p RefAsPointee, references are treated like their underlying type 540/// (for alignof), else they're treated like pointers (for CodeGen). 541unsigned ASTContext::getDeclAlignInBytes(const Decl *D, bool RefAsPointee) { 542 unsigned Align = Target.getCharWidth(); 543 544 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 545 Align = std::max(Align, AA->getMaxAlignment()); 546 547 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 548 QualType T = VD->getType(); 549 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 550 if (RefAsPointee) 551 T = RT->getPointeeType(); 552 else 553 T = getPointerType(RT->getPointeeType()); 554 } 555 if (!T->isIncompleteType() && !T->isFunctionType()) { 556 // Incomplete or function types default to 1. 557 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 558 T = cast<ArrayType>(T)->getElementType(); 559 560 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 561 } 562 } 563 564 return Align / Target.getCharWidth(); 565} 566 567/// getTypeSize - Return the size of the specified type, in bits. This method 568/// does not work on incomplete types. 569/// 570/// FIXME: Pointers into different addr spaces could have different sizes and 571/// alignment requirements: getPointerInfo should take an AddrSpace, this 572/// should take a QualType, &c. 573std::pair<uint64_t, unsigned> 574ASTContext::getTypeInfo(const Type *T) { 575 uint64_t Width=0; 576 unsigned Align=8; 577 switch (T->getTypeClass()) { 578#define TYPE(Class, Base) 579#define ABSTRACT_TYPE(Class, Base) 580#define NON_CANONICAL_TYPE(Class, Base) 581#define DEPENDENT_TYPE(Class, Base) case Type::Class: 582#include "clang/AST/TypeNodes.def" 583 assert(false && "Should not see dependent types"); 584 break; 585 586 case Type::FunctionNoProto: 587 case Type::FunctionProto: 588 // GCC extension: alignof(function) = 32 bits 589 Width = 0; 590 Align = 32; 591 break; 592 593 case Type::IncompleteArray: 594 case Type::VariableArray: 595 Width = 0; 596 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 597 break; 598 599 case Type::ConstantArray: { 600 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 601 602 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 603 Width = EltInfo.first*CAT->getSize().getZExtValue(); 604 Align = EltInfo.second; 605 break; 606 } 607 case Type::ExtVector: 608 case Type::Vector: { 609 const VectorType *VT = cast<VectorType>(T); 610 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 611 Width = EltInfo.first*VT->getNumElements(); 612 Align = Width; 613 // If the alignment is not a power of 2, round up to the next power of 2. 614 // This happens for non-power-of-2 length vectors. 615 if (VT->getNumElements() & (VT->getNumElements()-1)) { 616 Align = llvm::NextPowerOf2(Align); 617 Width = llvm::RoundUpToAlignment(Width, Align); 618 } 619 break; 620 } 621 622 case Type::Builtin: 623 switch (cast<BuiltinType>(T)->getKind()) { 624 default: assert(0 && "Unknown builtin type!"); 625 case BuiltinType::Void: 626 // GCC extension: alignof(void) = 8 bits. 627 Width = 0; 628 Align = 8; 629 break; 630 631 case BuiltinType::Bool: 632 Width = Target.getBoolWidth(); 633 Align = Target.getBoolAlign(); 634 break; 635 case BuiltinType::Char_S: 636 case BuiltinType::Char_U: 637 case BuiltinType::UChar: 638 case BuiltinType::SChar: 639 Width = Target.getCharWidth(); 640 Align = Target.getCharAlign(); 641 break; 642 case BuiltinType::WChar: 643 Width = Target.getWCharWidth(); 644 Align = Target.getWCharAlign(); 645 break; 646 case BuiltinType::Char16: 647 Width = Target.getChar16Width(); 648 Align = Target.getChar16Align(); 649 break; 650 case BuiltinType::Char32: 651 Width = Target.getChar32Width(); 652 Align = Target.getChar32Align(); 653 break; 654 case BuiltinType::UShort: 655 case BuiltinType::Short: 656 Width = Target.getShortWidth(); 657 Align = Target.getShortAlign(); 658 break; 659 case BuiltinType::UInt: 660 case BuiltinType::Int: 661 Width = Target.getIntWidth(); 662 Align = Target.getIntAlign(); 663 break; 664 case BuiltinType::ULong: 665 case BuiltinType::Long: 666 Width = Target.getLongWidth(); 667 Align = Target.getLongAlign(); 668 break; 669 case BuiltinType::ULongLong: 670 case BuiltinType::LongLong: 671 Width = Target.getLongLongWidth(); 672 Align = Target.getLongLongAlign(); 673 break; 674 case BuiltinType::Int128: 675 case BuiltinType::UInt128: 676 Width = 128; 677 Align = 128; // int128_t is 128-bit aligned on all targets. 678 break; 679 case BuiltinType::Float: 680 Width = Target.getFloatWidth(); 681 Align = Target.getFloatAlign(); 682 break; 683 case BuiltinType::Double: 684 Width = Target.getDoubleWidth(); 685 Align = Target.getDoubleAlign(); 686 break; 687 case BuiltinType::LongDouble: 688 Width = Target.getLongDoubleWidth(); 689 Align = Target.getLongDoubleAlign(); 690 break; 691 case BuiltinType::NullPtr: 692 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 693 Align = Target.getPointerAlign(0); // == sizeof(void*) 694 break; 695 } 696 break; 697 case Type::ObjCObjectPointer: 698 Width = Target.getPointerWidth(0); 699 Align = Target.getPointerAlign(0); 700 break; 701 case Type::BlockPointer: { 702 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 703 Width = Target.getPointerWidth(AS); 704 Align = Target.getPointerAlign(AS); 705 break; 706 } 707 case Type::LValueReference: 708 case Type::RValueReference: { 709 // alignof and sizeof should never enter this code path here, so we go 710 // the pointer route. 711 unsigned AS = cast<ReferenceType>(T)->getPointeeType().getAddressSpace(); 712 Width = Target.getPointerWidth(AS); 713 Align = Target.getPointerAlign(AS); 714 break; 715 } 716 case Type::Pointer: { 717 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 718 Width = Target.getPointerWidth(AS); 719 Align = Target.getPointerAlign(AS); 720 break; 721 } 722 case Type::MemberPointer: { 723 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 724 std::pair<uint64_t, unsigned> PtrDiffInfo = 725 getTypeInfo(getPointerDiffType()); 726 Width = PtrDiffInfo.first; 727 if (Pointee->isFunctionType()) 728 Width *= 2; 729 Align = PtrDiffInfo.second; 730 break; 731 } 732 case Type::Complex: { 733 // Complex types have the same alignment as their elements, but twice the 734 // size. 735 std::pair<uint64_t, unsigned> EltInfo = 736 getTypeInfo(cast<ComplexType>(T)->getElementType()); 737 Width = EltInfo.first*2; 738 Align = EltInfo.second; 739 break; 740 } 741 case Type::ObjCInterface: { 742 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 743 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 744 Width = Layout.getSize(); 745 Align = Layout.getAlignment(); 746 break; 747 } 748 case Type::Record: 749 case Type::Enum: { 750 const TagType *TT = cast<TagType>(T); 751 752 if (TT->getDecl()->isInvalidDecl()) { 753 Width = 1; 754 Align = 1; 755 break; 756 } 757 758 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 759 return getTypeInfo(ET->getDecl()->getIntegerType()); 760 761 const RecordType *RT = cast<RecordType>(TT); 762 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 763 Width = Layout.getSize(); 764 Align = Layout.getAlignment(); 765 break; 766 } 767 768 case Type::SubstTemplateTypeParm: 769 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 770 getReplacementType().getTypePtr()); 771 772 case Type::Elaborated: 773 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType() 774 .getTypePtr()); 775 776 case Type::Typedef: { 777 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 778 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 779 Align = std::max(Aligned->getMaxAlignment(), 780 getTypeAlign(Typedef->getUnderlyingType().getTypePtr())); 781 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 782 } else 783 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 784 break; 785 } 786 787 case Type::TypeOfExpr: 788 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 789 .getTypePtr()); 790 791 case Type::TypeOf: 792 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 793 794 case Type::Decltype: 795 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 796 .getTypePtr()); 797 798 case Type::QualifiedName: 799 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 800 801 case Type::TemplateSpecialization: 802 assert(getCanonicalType(T) != T && 803 "Cannot request the size of a dependent type"); 804 // FIXME: this is likely to be wrong once we support template 805 // aliases, since a template alias could refer to a typedef that 806 // has an __aligned__ attribute on it. 807 return getTypeInfo(getCanonicalType(T)); 808 } 809 810 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 811 return std::make_pair(Width, Align); 812} 813 814/// getTypeSizeInChars - Return the size of the specified type, in characters. 815/// This method does not work on incomplete types. 816CharUnits ASTContext::getTypeSizeInChars(QualType T) { 817 return CharUnits::fromQuantity(getTypeSize(T) / getCharWidth()); 818} 819CharUnits ASTContext::getTypeSizeInChars(const Type *T) { 820 return CharUnits::fromQuantity(getTypeSize(T) / getCharWidth()); 821} 822 823/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 824/// type for the current target in bits. This can be different than the ABI 825/// alignment in cases where it is beneficial for performance to overalign 826/// a data type. 827unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 828 unsigned ABIAlign = getTypeAlign(T); 829 830 // Double and long long should be naturally aligned if possible. 831 if (const ComplexType* CT = T->getAs<ComplexType>()) 832 T = CT->getElementType().getTypePtr(); 833 if (T->isSpecificBuiltinType(BuiltinType::Double) || 834 T->isSpecificBuiltinType(BuiltinType::LongLong)) 835 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 836 837 return ABIAlign; 838} 839 840static void CollectLocalObjCIvars(ASTContext *Ctx, 841 const ObjCInterfaceDecl *OI, 842 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 843 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 844 E = OI->ivar_end(); I != E; ++I) { 845 ObjCIvarDecl *IVDecl = *I; 846 if (!IVDecl->isInvalidDecl()) 847 Fields.push_back(cast<FieldDecl>(IVDecl)); 848 } 849} 850 851void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 852 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 853 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 854 CollectObjCIvars(SuperClass, Fields); 855 CollectLocalObjCIvars(this, OI, Fields); 856} 857 858/// ShallowCollectObjCIvars - 859/// Collect all ivars, including those synthesized, in the current class. 860/// 861void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 862 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 863 bool CollectSynthesized) { 864 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 865 E = OI->ivar_end(); I != E; ++I) { 866 Ivars.push_back(*I); 867 } 868 if (CollectSynthesized) 869 CollectSynthesizedIvars(OI, Ivars); 870} 871 872void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 873 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 874 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 875 E = PD->prop_end(); I != E; ++I) 876 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 877 Ivars.push_back(Ivar); 878 879 // Also look into nested protocols. 880 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 881 E = PD->protocol_end(); P != E; ++P) 882 CollectProtocolSynthesizedIvars(*P, Ivars); 883} 884 885/// CollectSynthesizedIvars - 886/// This routine collect synthesized ivars for the designated class. 887/// 888void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 889 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 890 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 891 E = OI->prop_end(); I != E; ++I) { 892 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 893 Ivars.push_back(Ivar); 894 } 895 // Also look into interface's protocol list for properties declared 896 // in the protocol and whose ivars are synthesized. 897 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 898 PE = OI->protocol_end(); P != PE; ++P) { 899 ObjCProtocolDecl *PD = (*P); 900 CollectProtocolSynthesizedIvars(PD, Ivars); 901 } 902} 903 904/// CollectInheritedProtocols - Collect all protocols in current class and 905/// those inherited by it. 906void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 907 llvm::SmallVectorImpl<ObjCProtocolDecl*> &Protocols) { 908 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 909 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 910 PE = OI->protocol_end(); P != PE; ++P) { 911 ObjCProtocolDecl *Proto = (*P); 912 Protocols.push_back(Proto); 913 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 914 PE = Proto->protocol_end(); P != PE; ++P) 915 CollectInheritedProtocols(*P, Protocols); 916 } 917 918 // Categories of this Interface. 919 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 920 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 921 CollectInheritedProtocols(CDeclChain, Protocols); 922 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 923 while (SD) { 924 CollectInheritedProtocols(SD, Protocols); 925 SD = SD->getSuperClass(); 926 } 927 return; 928 } 929 if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 930 for (ObjCInterfaceDecl::protocol_iterator P = OC->protocol_begin(), 931 PE = OC->protocol_end(); P != PE; ++P) { 932 ObjCProtocolDecl *Proto = (*P); 933 Protocols.push_back(Proto); 934 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 935 PE = Proto->protocol_end(); P != PE; ++P) 936 CollectInheritedProtocols(*P, Protocols); 937 } 938 return; 939 } 940 if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 941 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 942 PE = OP->protocol_end(); P != PE; ++P) { 943 ObjCProtocolDecl *Proto = (*P); 944 Protocols.push_back(Proto); 945 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 946 PE = Proto->protocol_end(); P != PE; ++P) 947 CollectInheritedProtocols(*P, Protocols); 948 } 949 return; 950 } 951} 952 953unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 954 unsigned count = 0; 955 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 956 E = PD->prop_end(); I != E; ++I) 957 if ((*I)->getPropertyIvarDecl()) 958 ++count; 959 960 // Also look into nested protocols. 961 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 962 E = PD->protocol_end(); P != E; ++P) 963 count += CountProtocolSynthesizedIvars(*P); 964 return count; 965} 966 967unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) { 968 unsigned count = 0; 969 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 970 E = OI->prop_end(); I != E; ++I) { 971 if ((*I)->getPropertyIvarDecl()) 972 ++count; 973 } 974 // Also look into interface's protocol list for properties declared 975 // in the protocol and whose ivars are synthesized. 976 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 977 PE = OI->protocol_end(); P != PE; ++P) { 978 ObjCProtocolDecl *PD = (*P); 979 count += CountProtocolSynthesizedIvars(PD); 980 } 981 return count; 982} 983 984/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 985ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 986 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 987 I = ObjCImpls.find(D); 988 if (I != ObjCImpls.end()) 989 return cast<ObjCImplementationDecl>(I->second); 990 return 0; 991} 992/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 993ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 994 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 995 I = ObjCImpls.find(D); 996 if (I != ObjCImpls.end()) 997 return cast<ObjCCategoryImplDecl>(I->second); 998 return 0; 999} 1000 1001/// \brief Set the implementation of ObjCInterfaceDecl. 1002void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 1003 ObjCImplementationDecl *ImplD) { 1004 assert(IFaceD && ImplD && "Passed null params"); 1005 ObjCImpls[IFaceD] = ImplD; 1006} 1007/// \brief Set the implementation of ObjCCategoryDecl. 1008void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 1009 ObjCCategoryImplDecl *ImplD) { 1010 assert(CatD && ImplD && "Passed null params"); 1011 ObjCImpls[CatD] = ImplD; 1012} 1013 1014/// \brief Allocate an uninitialized TypeSourceInfo. 1015/// 1016/// The caller should initialize the memory held by TypeSourceInfo using 1017/// the TypeLoc wrappers. 1018/// 1019/// \param T the type that will be the basis for type source info. This type 1020/// should refer to how the declarator was written in source code, not to 1021/// what type semantic analysis resolved the declarator to. 1022TypeSourceInfo *ASTContext::CreateTypeSourceInfo(QualType T, 1023 unsigned DataSize) { 1024 if (!DataSize) 1025 DataSize = TypeLoc::getFullDataSizeForType(T); 1026 else 1027 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 1028 "incorrect data size provided to CreateTypeSourceInfo!"); 1029 1030 TypeSourceInfo *TInfo = 1031 (TypeSourceInfo*)BumpAlloc.Allocate(sizeof(TypeSourceInfo) + DataSize, 8); 1032 new (TInfo) TypeSourceInfo(T); 1033 return TInfo; 1034} 1035 1036TypeSourceInfo *ASTContext::getTrivialTypeSourceInfo(QualType T, 1037 SourceLocation L) { 1038 TypeSourceInfo *DI = CreateTypeSourceInfo(T); 1039 DI->getTypeLoc().initialize(L); 1040 return DI; 1041} 1042 1043/// getInterfaceLayoutImpl - Get or compute information about the 1044/// layout of the given interface. 1045/// 1046/// \param Impl - If given, also include the layout of the interface's 1047/// implementation. This may differ by including synthesized ivars. 1048const ASTRecordLayout & 1049ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 1050 const ObjCImplementationDecl *Impl) { 1051 assert(!D->isForwardDecl() && "Invalid interface decl!"); 1052 1053 // Look up this layout, if already laid out, return what we have. 1054 ObjCContainerDecl *Key = 1055 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 1056 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 1057 return *Entry; 1058 1059 // Add in synthesized ivar count if laying out an implementation. 1060 if (Impl) { 1061 unsigned SynthCount = CountSynthesizedIvars(D); 1062 // If there aren't any sythesized ivars then reuse the interface 1063 // entry. Note we can't cache this because we simply free all 1064 // entries later; however we shouldn't look up implementations 1065 // frequently. 1066 if (SynthCount == 0) 1067 return getObjCLayout(D, 0); 1068 } 1069 1070 const ASTRecordLayout *NewEntry = 1071 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 1072 ObjCLayouts[Key] = NewEntry; 1073 1074 return *NewEntry; 1075} 1076 1077const ASTRecordLayout & 1078ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 1079 return getObjCLayout(D, 0); 1080} 1081 1082const ASTRecordLayout & 1083ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 1084 return getObjCLayout(D->getClassInterface(), D); 1085} 1086 1087/// getASTRecordLayout - Get or compute information about the layout of the 1088/// specified record (struct/union/class), which indicates its size and field 1089/// position information. 1090const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 1091 D = D->getDefinition(*this); 1092 assert(D && "Cannot get layout of forward declarations!"); 1093 1094 // Look up this layout, if already laid out, return what we have. 1095 // Note that we can't save a reference to the entry because this function 1096 // is recursive. 1097 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 1098 if (Entry) return *Entry; 1099 1100 const ASTRecordLayout *NewEntry = 1101 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 1102 ASTRecordLayouts[D] = NewEntry; 1103 1104 return *NewEntry; 1105} 1106 1107const CXXMethodDecl *ASTContext::getKeyFunction(const CXXRecordDecl *RD) { 1108 RD = cast<CXXRecordDecl>(RD->getDefinition(*this)); 1109 assert(RD && "Cannot get key function for forward declarations!"); 1110 1111 const CXXMethodDecl *&Entry = KeyFunctions[RD]; 1112 if (!Entry) 1113 Entry = ASTRecordLayoutBuilder::ComputeKeyFunction(RD); 1114 else 1115 assert(Entry == ASTRecordLayoutBuilder::ComputeKeyFunction(RD) && 1116 "Key function changed!"); 1117 1118 return Entry; 1119} 1120 1121//===----------------------------------------------------------------------===// 1122// Type creation/memoization methods 1123//===----------------------------------------------------------------------===// 1124 1125QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1126 unsigned Fast = Quals.getFastQualifiers(); 1127 Quals.removeFastQualifiers(); 1128 1129 // Check if we've already instantiated this type. 1130 llvm::FoldingSetNodeID ID; 1131 ExtQuals::Profile(ID, TypeNode, Quals); 1132 void *InsertPos = 0; 1133 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1134 assert(EQ->getQualifiers() == Quals); 1135 QualType T = QualType(EQ, Fast); 1136 return T; 1137 } 1138 1139 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1140 ExtQualNodes.InsertNode(New, InsertPos); 1141 QualType T = QualType(New, Fast); 1142 return T; 1143} 1144 1145QualType ASTContext::getVolatileType(QualType T) { 1146 QualType CanT = getCanonicalType(T); 1147 if (CanT.isVolatileQualified()) return T; 1148 1149 QualifierCollector Quals; 1150 const Type *TypeNode = Quals.strip(T); 1151 Quals.addVolatile(); 1152 1153 return getExtQualType(TypeNode, Quals); 1154} 1155 1156QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1157 QualType CanT = getCanonicalType(T); 1158 if (CanT.getAddressSpace() == AddressSpace) 1159 return T; 1160 1161 // If we are composing extended qualifiers together, merge together 1162 // into one ExtQuals node. 1163 QualifierCollector Quals; 1164 const Type *TypeNode = Quals.strip(T); 1165 1166 // If this type already has an address space specified, it cannot get 1167 // another one. 1168 assert(!Quals.hasAddressSpace() && 1169 "Type cannot be in multiple addr spaces!"); 1170 Quals.addAddressSpace(AddressSpace); 1171 1172 return getExtQualType(TypeNode, Quals); 1173} 1174 1175QualType ASTContext::getObjCGCQualType(QualType T, 1176 Qualifiers::GC GCAttr) { 1177 QualType CanT = getCanonicalType(T); 1178 if (CanT.getObjCGCAttr() == GCAttr) 1179 return T; 1180 1181 if (T->isPointerType()) { 1182 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1183 if (Pointee->isAnyPointerType()) { 1184 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1185 return getPointerType(ResultType); 1186 } 1187 } 1188 1189 // If we are composing extended qualifiers together, merge together 1190 // into one ExtQuals node. 1191 QualifierCollector Quals; 1192 const Type *TypeNode = Quals.strip(T); 1193 1194 // If this type already has an ObjCGC specified, it cannot get 1195 // another one. 1196 assert(!Quals.hasObjCGCAttr() && 1197 "Type cannot have multiple ObjCGCs!"); 1198 Quals.addObjCGCAttr(GCAttr); 1199 1200 return getExtQualType(TypeNode, Quals); 1201} 1202 1203QualType ASTContext::getNoReturnType(QualType T, bool AddNoReturn) { 1204 QualType ResultType; 1205 if (const PointerType *Pointer = T->getAs<PointerType>()) { 1206 QualType Pointee = Pointer->getPointeeType(); 1207 ResultType = getNoReturnType(Pointee, AddNoReturn); 1208 if (ResultType == Pointee) 1209 return T; 1210 1211 ResultType = getPointerType(ResultType); 1212 } else if (const BlockPointerType *BlockPointer 1213 = T->getAs<BlockPointerType>()) { 1214 QualType Pointee = BlockPointer->getPointeeType(); 1215 ResultType = getNoReturnType(Pointee, AddNoReturn); 1216 if (ResultType == Pointee) 1217 return T; 1218 1219 ResultType = getBlockPointerType(ResultType); 1220 } else if (const FunctionType *F = T->getAs<FunctionType>()) { 1221 if (F->getNoReturnAttr() == AddNoReturn) 1222 return T; 1223 1224 if (const FunctionNoProtoType *FNPT = dyn_cast<FunctionNoProtoType>(F)) { 1225 ResultType = getFunctionNoProtoType(FNPT->getResultType(), AddNoReturn); 1226 } else { 1227 const FunctionProtoType *FPT = cast<FunctionProtoType>(F); 1228 ResultType 1229 = getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 1230 FPT->getNumArgs(), FPT->isVariadic(), 1231 FPT->getTypeQuals(), 1232 FPT->hasExceptionSpec(), FPT->hasAnyExceptionSpec(), 1233 FPT->getNumExceptions(), FPT->exception_begin(), 1234 AddNoReturn); 1235 } 1236 } else 1237 return T; 1238 1239 return getQualifiedType(ResultType, T.getLocalQualifiers()); 1240} 1241 1242/// getComplexType - Return the uniqued reference to the type for a complex 1243/// number with the specified element type. 1244QualType ASTContext::getComplexType(QualType T) { 1245 // Unique pointers, to guarantee there is only one pointer of a particular 1246 // structure. 1247 llvm::FoldingSetNodeID ID; 1248 ComplexType::Profile(ID, T); 1249 1250 void *InsertPos = 0; 1251 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1252 return QualType(CT, 0); 1253 1254 // If the pointee type isn't canonical, this won't be a canonical type either, 1255 // so fill in the canonical type field. 1256 QualType Canonical; 1257 if (!T.isCanonical()) { 1258 Canonical = getComplexType(getCanonicalType(T)); 1259 1260 // Get the new insert position for the node we care about. 1261 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1262 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1263 } 1264 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1265 Types.push_back(New); 1266 ComplexTypes.InsertNode(New, InsertPos); 1267 return QualType(New, 0); 1268} 1269 1270/// getPointerType - Return the uniqued reference to the type for a pointer to 1271/// the specified type. 1272QualType ASTContext::getPointerType(QualType T) { 1273 // Unique pointers, to guarantee there is only one pointer of a particular 1274 // structure. 1275 llvm::FoldingSetNodeID ID; 1276 PointerType::Profile(ID, T); 1277 1278 void *InsertPos = 0; 1279 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1280 return QualType(PT, 0); 1281 1282 // If the pointee type isn't canonical, this won't be a canonical type either, 1283 // so fill in the canonical type field. 1284 QualType Canonical; 1285 if (!T.isCanonical()) { 1286 Canonical = getPointerType(getCanonicalType(T)); 1287 1288 // Get the new insert position for the node we care about. 1289 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1290 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1291 } 1292 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1293 Types.push_back(New); 1294 PointerTypes.InsertNode(New, InsertPos); 1295 return QualType(New, 0); 1296} 1297 1298/// getBlockPointerType - Return the uniqued reference to the type for 1299/// a pointer to the specified block. 1300QualType ASTContext::getBlockPointerType(QualType T) { 1301 assert(T->isFunctionType() && "block of function types only"); 1302 // Unique pointers, to guarantee there is only one block of a particular 1303 // structure. 1304 llvm::FoldingSetNodeID ID; 1305 BlockPointerType::Profile(ID, T); 1306 1307 void *InsertPos = 0; 1308 if (BlockPointerType *PT = 1309 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1310 return QualType(PT, 0); 1311 1312 // If the block pointee type isn't canonical, this won't be a canonical 1313 // type either so fill in the canonical type field. 1314 QualType Canonical; 1315 if (!T.isCanonical()) { 1316 Canonical = getBlockPointerType(getCanonicalType(T)); 1317 1318 // Get the new insert position for the node we care about. 1319 BlockPointerType *NewIP = 1320 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1321 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1322 } 1323 BlockPointerType *New 1324 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1325 Types.push_back(New); 1326 BlockPointerTypes.InsertNode(New, InsertPos); 1327 return QualType(New, 0); 1328} 1329 1330/// getLValueReferenceType - Return the uniqued reference to the type for an 1331/// lvalue reference to the specified type. 1332QualType ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) { 1333 // Unique pointers, to guarantee there is only one pointer of a particular 1334 // structure. 1335 llvm::FoldingSetNodeID ID; 1336 ReferenceType::Profile(ID, T, SpelledAsLValue); 1337 1338 void *InsertPos = 0; 1339 if (LValueReferenceType *RT = 1340 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1341 return QualType(RT, 0); 1342 1343 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1344 1345 // If the referencee type isn't canonical, this won't be a canonical type 1346 // either, so fill in the canonical type field. 1347 QualType Canonical; 1348 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1349 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1350 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1351 1352 // Get the new insert position for the node we care about. 1353 LValueReferenceType *NewIP = 1354 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1355 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1356 } 1357 1358 LValueReferenceType *New 1359 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1360 SpelledAsLValue); 1361 Types.push_back(New); 1362 LValueReferenceTypes.InsertNode(New, InsertPos); 1363 1364 return QualType(New, 0); 1365} 1366 1367/// getRValueReferenceType - Return the uniqued reference to the type for an 1368/// rvalue reference to the specified type. 1369QualType ASTContext::getRValueReferenceType(QualType T) { 1370 // Unique pointers, to guarantee there is only one pointer of a particular 1371 // structure. 1372 llvm::FoldingSetNodeID ID; 1373 ReferenceType::Profile(ID, T, false); 1374 1375 void *InsertPos = 0; 1376 if (RValueReferenceType *RT = 1377 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1378 return QualType(RT, 0); 1379 1380 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1381 1382 // If the referencee type isn't canonical, this won't be a canonical type 1383 // either, so fill in the canonical type field. 1384 QualType Canonical; 1385 if (InnerRef || !T.isCanonical()) { 1386 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1387 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1388 1389 // Get the new insert position for the node we care about. 1390 RValueReferenceType *NewIP = 1391 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1392 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1393 } 1394 1395 RValueReferenceType *New 1396 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1397 Types.push_back(New); 1398 RValueReferenceTypes.InsertNode(New, InsertPos); 1399 return QualType(New, 0); 1400} 1401 1402/// getMemberPointerType - Return the uniqued reference to the type for a 1403/// member pointer to the specified type, in the specified class. 1404QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1405 // Unique pointers, to guarantee there is only one pointer of a particular 1406 // structure. 1407 llvm::FoldingSetNodeID ID; 1408 MemberPointerType::Profile(ID, T, Cls); 1409 1410 void *InsertPos = 0; 1411 if (MemberPointerType *PT = 1412 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1413 return QualType(PT, 0); 1414 1415 // If the pointee or class type isn't canonical, this won't be a canonical 1416 // type either, so fill in the canonical type field. 1417 QualType Canonical; 1418 if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) { 1419 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1420 1421 // Get the new insert position for the node we care about. 1422 MemberPointerType *NewIP = 1423 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1424 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1425 } 1426 MemberPointerType *New 1427 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1428 Types.push_back(New); 1429 MemberPointerTypes.InsertNode(New, InsertPos); 1430 return QualType(New, 0); 1431} 1432 1433/// getConstantArrayType - Return the unique reference to the type for an 1434/// array of the specified element type. 1435QualType ASTContext::getConstantArrayType(QualType EltTy, 1436 const llvm::APInt &ArySizeIn, 1437 ArrayType::ArraySizeModifier ASM, 1438 unsigned EltTypeQuals) { 1439 assert((EltTy->isDependentType() || 1440 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1441 "Constant array of VLAs is illegal!"); 1442 1443 // Convert the array size into a canonical width matching the pointer size for 1444 // the target. 1445 llvm::APInt ArySize(ArySizeIn); 1446 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1447 1448 llvm::FoldingSetNodeID ID; 1449 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1450 1451 void *InsertPos = 0; 1452 if (ConstantArrayType *ATP = 1453 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1454 return QualType(ATP, 0); 1455 1456 // If the element type isn't canonical, this won't be a canonical type either, 1457 // so fill in the canonical type field. 1458 QualType Canonical; 1459 if (!EltTy.isCanonical()) { 1460 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1461 ASM, EltTypeQuals); 1462 // Get the new insert position for the node we care about. 1463 ConstantArrayType *NewIP = 1464 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1465 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1466 } 1467 1468 ConstantArrayType *New = new(*this,TypeAlignment) 1469 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1470 ConstantArrayTypes.InsertNode(New, InsertPos); 1471 Types.push_back(New); 1472 return QualType(New, 0); 1473} 1474 1475/// getVariableArrayType - Returns a non-unique reference to the type for a 1476/// variable array of the specified element type. 1477QualType ASTContext::getVariableArrayType(QualType EltTy, 1478 Expr *NumElts, 1479 ArrayType::ArraySizeModifier ASM, 1480 unsigned EltTypeQuals, 1481 SourceRange Brackets) { 1482 // Since we don't unique expressions, it isn't possible to unique VLA's 1483 // that have an expression provided for their size. 1484 1485 VariableArrayType *New = new(*this, TypeAlignment) 1486 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1487 1488 VariableArrayTypes.push_back(New); 1489 Types.push_back(New); 1490 return QualType(New, 0); 1491} 1492 1493/// getDependentSizedArrayType - Returns a non-unique reference to 1494/// the type for a dependently-sized array of the specified element 1495/// type. 1496QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1497 Expr *NumElts, 1498 ArrayType::ArraySizeModifier ASM, 1499 unsigned EltTypeQuals, 1500 SourceRange Brackets) { 1501 assert((!NumElts || NumElts->isTypeDependent() || 1502 NumElts->isValueDependent()) && 1503 "Size must be type- or value-dependent!"); 1504 1505 void *InsertPos = 0; 1506 DependentSizedArrayType *Canon = 0; 1507 1508 if (NumElts) { 1509 // Dependently-sized array types that do not have a specified 1510 // number of elements will have their sizes deduced from an 1511 // initializer. 1512 llvm::FoldingSetNodeID ID; 1513 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1514 EltTypeQuals, NumElts); 1515 1516 Canon = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1517 } 1518 1519 DependentSizedArrayType *New; 1520 if (Canon) { 1521 // We already have a canonical version of this array type; use it as 1522 // the canonical type for a newly-built type. 1523 New = new (*this, TypeAlignment) 1524 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1525 NumElts, ASM, EltTypeQuals, Brackets); 1526 } else { 1527 QualType CanonEltTy = getCanonicalType(EltTy); 1528 if (CanonEltTy == EltTy) { 1529 New = new (*this, TypeAlignment) 1530 DependentSizedArrayType(*this, EltTy, QualType(), 1531 NumElts, ASM, EltTypeQuals, Brackets); 1532 1533 if (NumElts) 1534 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1535 } else { 1536 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1537 ASM, EltTypeQuals, 1538 SourceRange()); 1539 New = new (*this, TypeAlignment) 1540 DependentSizedArrayType(*this, EltTy, Canon, 1541 NumElts, ASM, EltTypeQuals, Brackets); 1542 } 1543 } 1544 1545 Types.push_back(New); 1546 return QualType(New, 0); 1547} 1548 1549QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1550 ArrayType::ArraySizeModifier ASM, 1551 unsigned EltTypeQuals) { 1552 llvm::FoldingSetNodeID ID; 1553 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1554 1555 void *InsertPos = 0; 1556 if (IncompleteArrayType *ATP = 1557 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1558 return QualType(ATP, 0); 1559 1560 // If the element type isn't canonical, this won't be a canonical type 1561 // either, so fill in the canonical type field. 1562 QualType Canonical; 1563 1564 if (!EltTy.isCanonical()) { 1565 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1566 ASM, EltTypeQuals); 1567 1568 // Get the new insert position for the node we care about. 1569 IncompleteArrayType *NewIP = 1570 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1571 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1572 } 1573 1574 IncompleteArrayType *New = new (*this, TypeAlignment) 1575 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1576 1577 IncompleteArrayTypes.InsertNode(New, InsertPos); 1578 Types.push_back(New); 1579 return QualType(New, 0); 1580} 1581 1582/// getVectorType - Return the unique reference to a vector type of 1583/// the specified element type and size. VectorType must be a built-in type. 1584QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1585 BuiltinType *baseType; 1586 1587 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1588 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1589 1590 // Check if we've already instantiated a vector of this type. 1591 llvm::FoldingSetNodeID ID; 1592 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1593 void *InsertPos = 0; 1594 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1595 return QualType(VTP, 0); 1596 1597 // If the element type isn't canonical, this won't be a canonical type either, 1598 // so fill in the canonical type field. 1599 QualType Canonical; 1600 if (!vecType.isCanonical()) { 1601 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1602 1603 // Get the new insert position for the node we care about. 1604 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1605 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1606 } 1607 VectorType *New = new (*this, TypeAlignment) 1608 VectorType(vecType, NumElts, Canonical); 1609 VectorTypes.InsertNode(New, InsertPos); 1610 Types.push_back(New); 1611 return QualType(New, 0); 1612} 1613 1614/// getExtVectorType - Return the unique reference to an extended vector type of 1615/// the specified element type and size. VectorType must be a built-in type. 1616QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1617 BuiltinType *baseType; 1618 1619 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1620 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1621 1622 // Check if we've already instantiated a vector of this type. 1623 llvm::FoldingSetNodeID ID; 1624 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1625 void *InsertPos = 0; 1626 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1627 return QualType(VTP, 0); 1628 1629 // If the element type isn't canonical, this won't be a canonical type either, 1630 // so fill in the canonical type field. 1631 QualType Canonical; 1632 if (!vecType.isCanonical()) { 1633 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1634 1635 // Get the new insert position for the node we care about. 1636 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1637 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1638 } 1639 ExtVectorType *New = new (*this, TypeAlignment) 1640 ExtVectorType(vecType, NumElts, Canonical); 1641 VectorTypes.InsertNode(New, InsertPos); 1642 Types.push_back(New); 1643 return QualType(New, 0); 1644} 1645 1646QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1647 Expr *SizeExpr, 1648 SourceLocation AttrLoc) { 1649 llvm::FoldingSetNodeID ID; 1650 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1651 SizeExpr); 1652 1653 void *InsertPos = 0; 1654 DependentSizedExtVectorType *Canon 1655 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1656 DependentSizedExtVectorType *New; 1657 if (Canon) { 1658 // We already have a canonical version of this array type; use it as 1659 // the canonical type for a newly-built type. 1660 New = new (*this, TypeAlignment) 1661 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1662 SizeExpr, AttrLoc); 1663 } else { 1664 QualType CanonVecTy = getCanonicalType(vecType); 1665 if (CanonVecTy == vecType) { 1666 New = new (*this, TypeAlignment) 1667 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1668 AttrLoc); 1669 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1670 } else { 1671 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1672 SourceLocation()); 1673 New = new (*this, TypeAlignment) 1674 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1675 } 1676 } 1677 1678 Types.push_back(New); 1679 return QualType(New, 0); 1680} 1681 1682/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1683/// 1684QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1685 // Unique functions, to guarantee there is only one function of a particular 1686 // structure. 1687 llvm::FoldingSetNodeID ID; 1688 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1689 1690 void *InsertPos = 0; 1691 if (FunctionNoProtoType *FT = 1692 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1693 return QualType(FT, 0); 1694 1695 QualType Canonical; 1696 if (!ResultTy.isCanonical()) { 1697 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1698 1699 // Get the new insert position for the node we care about. 1700 FunctionNoProtoType *NewIP = 1701 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1702 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1703 } 1704 1705 FunctionNoProtoType *New = new (*this, TypeAlignment) 1706 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1707 Types.push_back(New); 1708 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1709 return QualType(New, 0); 1710} 1711 1712/// getFunctionType - Return a normal function type with a typed argument 1713/// list. isVariadic indicates whether the argument list includes '...'. 1714QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1715 unsigned NumArgs, bool isVariadic, 1716 unsigned TypeQuals, bool hasExceptionSpec, 1717 bool hasAnyExceptionSpec, unsigned NumExs, 1718 const QualType *ExArray, bool NoReturn) { 1719 // Unique functions, to guarantee there is only one function of a particular 1720 // structure. 1721 llvm::FoldingSetNodeID ID; 1722 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1723 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1724 NumExs, ExArray, NoReturn); 1725 1726 void *InsertPos = 0; 1727 if (FunctionProtoType *FTP = 1728 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1729 return QualType(FTP, 0); 1730 1731 // Determine whether the type being created is already canonical or not. 1732 bool isCanonical = !hasExceptionSpec && ResultTy.isCanonical(); 1733 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1734 if (!ArgArray[i].isCanonicalAsParam()) 1735 isCanonical = false; 1736 1737 // If this type isn't canonical, get the canonical version of it. 1738 // The exception spec is not part of the canonical type. 1739 QualType Canonical; 1740 if (!isCanonical) { 1741 llvm::SmallVector<QualType, 16> CanonicalArgs; 1742 CanonicalArgs.reserve(NumArgs); 1743 for (unsigned i = 0; i != NumArgs; ++i) 1744 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1745 1746 Canonical = getFunctionType(getCanonicalType(ResultTy), 1747 CanonicalArgs.data(), NumArgs, 1748 isVariadic, TypeQuals, false, 1749 false, 0, 0, NoReturn); 1750 1751 // Get the new insert position for the node we care about. 1752 FunctionProtoType *NewIP = 1753 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1754 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1755 } 1756 1757 // FunctionProtoType objects are allocated with extra bytes after them 1758 // for two variable size arrays (for parameter and exception types) at the 1759 // end of them. 1760 FunctionProtoType *FTP = 1761 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1762 NumArgs*sizeof(QualType) + 1763 NumExs*sizeof(QualType), TypeAlignment); 1764 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1765 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1766 ExArray, NumExs, Canonical, NoReturn); 1767 Types.push_back(FTP); 1768 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1769 return QualType(FTP, 0); 1770} 1771 1772/// getTypeDeclType - Return the unique reference to the type for the 1773/// specified type declaration. 1774QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1775 assert(Decl && "Passed null for Decl param"); 1776 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1777 1778 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1779 return getTypedefType(Typedef); 1780 else if (isa<TemplateTypeParmDecl>(Decl)) { 1781 assert(false && "Template type parameter types are always available."); 1782 } else if (ObjCInterfaceDecl *ObjCInterface 1783 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1784 return getObjCInterfaceType(ObjCInterface); 1785 1786 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1787 if (PrevDecl) 1788 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1789 else 1790 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1791 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1792 if (PrevDecl) 1793 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1794 else 1795 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1796 } else if (UnresolvedUsingTypenameDecl *Using = 1797 dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) { 1798 Decl->TypeForDecl = new (*this, TypeAlignment) UnresolvedUsingType(Using); 1799 } else 1800 assert(false && "TypeDecl without a type?"); 1801 1802 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1803 return QualType(Decl->TypeForDecl, 0); 1804} 1805 1806/// getTypedefType - Return the unique reference to the type for the 1807/// specified typename decl. 1808QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1809 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1810 1811 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1812 Decl->TypeForDecl = new(*this, TypeAlignment) 1813 TypedefType(Type::Typedef, Decl, Canonical); 1814 Types.push_back(Decl->TypeForDecl); 1815 return QualType(Decl->TypeForDecl, 0); 1816} 1817 1818/// \brief Retrieve a substitution-result type. 1819QualType 1820ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1821 QualType Replacement) { 1822 assert(Replacement.isCanonical() 1823 && "replacement types must always be canonical"); 1824 1825 llvm::FoldingSetNodeID ID; 1826 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1827 void *InsertPos = 0; 1828 SubstTemplateTypeParmType *SubstParm 1829 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1830 1831 if (!SubstParm) { 1832 SubstParm = new (*this, TypeAlignment) 1833 SubstTemplateTypeParmType(Parm, Replacement); 1834 Types.push_back(SubstParm); 1835 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1836 } 1837 1838 return QualType(SubstParm, 0); 1839} 1840 1841/// \brief Retrieve the template type parameter type for a template 1842/// parameter or parameter pack with the given depth, index, and (optionally) 1843/// name. 1844QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1845 bool ParameterPack, 1846 IdentifierInfo *Name) { 1847 llvm::FoldingSetNodeID ID; 1848 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1849 void *InsertPos = 0; 1850 TemplateTypeParmType *TypeParm 1851 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1852 1853 if (TypeParm) 1854 return QualType(TypeParm, 0); 1855 1856 if (Name) { 1857 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1858 TypeParm = new (*this, TypeAlignment) 1859 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1860 } else 1861 TypeParm = new (*this, TypeAlignment) 1862 TemplateTypeParmType(Depth, Index, ParameterPack); 1863 1864 Types.push_back(TypeParm); 1865 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1866 1867 return QualType(TypeParm, 0); 1868} 1869 1870QualType 1871ASTContext::getTemplateSpecializationType(TemplateName Template, 1872 const TemplateArgumentListInfo &Args, 1873 QualType Canon) { 1874 unsigned NumArgs = Args.size(); 1875 1876 llvm::SmallVector<TemplateArgument, 4> ArgVec; 1877 ArgVec.reserve(NumArgs); 1878 for (unsigned i = 0; i != NumArgs; ++i) 1879 ArgVec.push_back(Args[i].getArgument()); 1880 1881 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, Canon); 1882} 1883 1884QualType 1885ASTContext::getTemplateSpecializationType(TemplateName Template, 1886 const TemplateArgument *Args, 1887 unsigned NumArgs, 1888 QualType Canon) { 1889 if (!Canon.isNull()) 1890 Canon = getCanonicalType(Canon); 1891 else { 1892 // Build the canonical template specialization type. 1893 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1894 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1895 CanonArgs.reserve(NumArgs); 1896 for (unsigned I = 0; I != NumArgs; ++I) 1897 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1898 1899 // Determine whether this canonical template specialization type already 1900 // exists. 1901 llvm::FoldingSetNodeID ID; 1902 TemplateSpecializationType::Profile(ID, CanonTemplate, 1903 CanonArgs.data(), NumArgs, *this); 1904 1905 void *InsertPos = 0; 1906 TemplateSpecializationType *Spec 1907 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1908 1909 if (!Spec) { 1910 // Allocate a new canonical template specialization type. 1911 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1912 sizeof(TemplateArgument) * NumArgs), 1913 TypeAlignment); 1914 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1915 CanonArgs.data(), NumArgs, 1916 Canon); 1917 Types.push_back(Spec); 1918 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1919 } 1920 1921 if (Canon.isNull()) 1922 Canon = QualType(Spec, 0); 1923 assert(Canon->isDependentType() && 1924 "Non-dependent template-id type must have a canonical type"); 1925 } 1926 1927 // Allocate the (non-canonical) template specialization type, but don't 1928 // try to unique it: these types typically have location information that 1929 // we don't unique and don't want to lose. 1930 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1931 sizeof(TemplateArgument) * NumArgs), 1932 TypeAlignment); 1933 TemplateSpecializationType *Spec 1934 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1935 Canon); 1936 1937 Types.push_back(Spec); 1938 return QualType(Spec, 0); 1939} 1940 1941QualType 1942ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1943 QualType NamedType) { 1944 llvm::FoldingSetNodeID ID; 1945 QualifiedNameType::Profile(ID, NNS, NamedType); 1946 1947 void *InsertPos = 0; 1948 QualifiedNameType *T 1949 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1950 if (T) 1951 return QualType(T, 0); 1952 1953 T = new (*this) QualifiedNameType(NNS, NamedType, 1954 getCanonicalType(NamedType)); 1955 Types.push_back(T); 1956 QualifiedNameTypes.InsertNode(T, InsertPos); 1957 return QualType(T, 0); 1958} 1959 1960QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1961 const IdentifierInfo *Name, 1962 QualType Canon) { 1963 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1964 1965 if (Canon.isNull()) { 1966 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1967 if (CanonNNS != NNS) 1968 Canon = getTypenameType(CanonNNS, Name); 1969 } 1970 1971 llvm::FoldingSetNodeID ID; 1972 TypenameType::Profile(ID, NNS, Name); 1973 1974 void *InsertPos = 0; 1975 TypenameType *T 1976 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1977 if (T) 1978 return QualType(T, 0); 1979 1980 T = new (*this) TypenameType(NNS, Name, Canon); 1981 Types.push_back(T); 1982 TypenameTypes.InsertNode(T, InsertPos); 1983 return QualType(T, 0); 1984} 1985 1986QualType 1987ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1988 const TemplateSpecializationType *TemplateId, 1989 QualType Canon) { 1990 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1991 1992 if (Canon.isNull()) { 1993 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1994 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1995 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1996 const TemplateSpecializationType *CanonTemplateId 1997 = CanonType->getAs<TemplateSpecializationType>(); 1998 assert(CanonTemplateId && 1999 "Canonical type must also be a template specialization type"); 2000 Canon = getTypenameType(CanonNNS, CanonTemplateId); 2001 } 2002 } 2003 2004 llvm::FoldingSetNodeID ID; 2005 TypenameType::Profile(ID, NNS, TemplateId); 2006 2007 void *InsertPos = 0; 2008 TypenameType *T 2009 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 2010 if (T) 2011 return QualType(T, 0); 2012 2013 T = new (*this) TypenameType(NNS, TemplateId, Canon); 2014 Types.push_back(T); 2015 TypenameTypes.InsertNode(T, InsertPos); 2016 return QualType(T, 0); 2017} 2018 2019QualType 2020ASTContext::getElaboratedType(QualType UnderlyingType, 2021 ElaboratedType::TagKind Tag) { 2022 llvm::FoldingSetNodeID ID; 2023 ElaboratedType::Profile(ID, UnderlyingType, Tag); 2024 2025 void *InsertPos = 0; 2026 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2027 if (T) 2028 return QualType(T, 0); 2029 2030 QualType Canon = getCanonicalType(UnderlyingType); 2031 2032 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 2033 Types.push_back(T); 2034 ElaboratedTypes.InsertNode(T, InsertPos); 2035 return QualType(T, 0); 2036} 2037 2038/// CmpProtocolNames - Comparison predicate for sorting protocols 2039/// alphabetically. 2040static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 2041 const ObjCProtocolDecl *RHS) { 2042 return LHS->getDeclName() < RHS->getDeclName(); 2043} 2044 2045static bool areSortedAndUniqued(ObjCProtocolDecl **Protocols, 2046 unsigned NumProtocols) { 2047 if (NumProtocols == 0) return true; 2048 2049 for (unsigned i = 1; i != NumProtocols; ++i) 2050 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 2051 return false; 2052 return true; 2053} 2054 2055static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2056 unsigned &NumProtocols) { 2057 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2058 2059 // Sort protocols, keyed by name. 2060 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2061 2062 // Remove duplicates. 2063 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2064 NumProtocols = ProtocolsEnd-Protocols; 2065} 2066 2067/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2068/// the given interface decl and the conforming protocol list. 2069QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 2070 ObjCProtocolDecl **Protocols, 2071 unsigned NumProtocols) { 2072 llvm::FoldingSetNodeID ID; 2073 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 2074 2075 void *InsertPos = 0; 2076 if (ObjCObjectPointerType *QT = 2077 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2078 return QualType(QT, 0); 2079 2080 // Sort the protocol list alphabetically to canonicalize it. 2081 QualType Canonical; 2082 if (!InterfaceT.isCanonical() || 2083 !areSortedAndUniqued(Protocols, NumProtocols)) { 2084 if (!areSortedAndUniqued(Protocols, NumProtocols)) { 2085 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2086 unsigned UniqueCount = NumProtocols; 2087 2088 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2089 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2090 2091 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2092 &Sorted[0], UniqueCount); 2093 } else { 2094 Canonical = getObjCObjectPointerType(getCanonicalType(InterfaceT), 2095 Protocols, NumProtocols); 2096 } 2097 2098 // Regenerate InsertPos. 2099 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2100 } 2101 2102 // No Match; 2103 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 2104 ObjCObjectPointerType(Canonical, InterfaceT, Protocols, NumProtocols); 2105 2106 Types.push_back(QType); 2107 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2108 return QualType(QType, 0); 2109} 2110 2111/// getObjCInterfaceType - Return the unique reference to the type for the 2112/// specified ObjC interface decl. The list of protocols is optional. 2113QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 2114 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 2115 llvm::FoldingSetNodeID ID; 2116 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 2117 2118 void *InsertPos = 0; 2119 if (ObjCInterfaceType *QT = 2120 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 2121 return QualType(QT, 0); 2122 2123 // Sort the protocol list alphabetically to canonicalize it. 2124 QualType Canonical; 2125 if (NumProtocols && !areSortedAndUniqued(Protocols, NumProtocols)) { 2126 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(NumProtocols); 2127 std::copy(Protocols, Protocols + NumProtocols, Sorted.begin()); 2128 2129 unsigned UniqueCount = NumProtocols; 2130 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2131 2132 Canonical = getObjCInterfaceType(Decl, &Sorted[0], UniqueCount); 2133 2134 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos); 2135 } 2136 2137 ObjCInterfaceType *QType = new (*this, TypeAlignment) 2138 ObjCInterfaceType(Canonical, const_cast<ObjCInterfaceDecl*>(Decl), 2139 Protocols, NumProtocols); 2140 2141 Types.push_back(QType); 2142 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 2143 return QualType(QType, 0); 2144} 2145 2146/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2147/// TypeOfExprType AST's (since expression's are never shared). For example, 2148/// multiple declarations that refer to "typeof(x)" all contain different 2149/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2150/// on canonical type's (which are always unique). 2151QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2152 TypeOfExprType *toe; 2153 if (tofExpr->isTypeDependent()) { 2154 llvm::FoldingSetNodeID ID; 2155 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2156 2157 void *InsertPos = 0; 2158 DependentTypeOfExprType *Canon 2159 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2160 if (Canon) { 2161 // We already have a "canonical" version of an identical, dependent 2162 // typeof(expr) type. Use that as our canonical type. 2163 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2164 QualType((TypeOfExprType*)Canon, 0)); 2165 } 2166 else { 2167 // Build a new, canonical typeof(expr) type. 2168 Canon 2169 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2170 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2171 toe = Canon; 2172 } 2173 } else { 2174 QualType Canonical = getCanonicalType(tofExpr->getType()); 2175 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2176 } 2177 Types.push_back(toe); 2178 return QualType(toe, 0); 2179} 2180 2181/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2182/// TypeOfType AST's. The only motivation to unique these nodes would be 2183/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2184/// an issue. This doesn't effect the type checker, since it operates 2185/// on canonical type's (which are always unique). 2186QualType ASTContext::getTypeOfType(QualType tofType) { 2187 QualType Canonical = getCanonicalType(tofType); 2188 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2189 Types.push_back(tot); 2190 return QualType(tot, 0); 2191} 2192 2193/// getDecltypeForExpr - Given an expr, will return the decltype for that 2194/// expression, according to the rules in C++0x [dcl.type.simple]p4 2195static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2196 if (e->isTypeDependent()) 2197 return Context.DependentTy; 2198 2199 // If e is an id expression or a class member access, decltype(e) is defined 2200 // as the type of the entity named by e. 2201 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2202 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2203 return VD->getType(); 2204 } 2205 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2206 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2207 return FD->getType(); 2208 } 2209 // If e is a function call or an invocation of an overloaded operator, 2210 // (parentheses around e are ignored), decltype(e) is defined as the 2211 // return type of that function. 2212 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2213 return CE->getCallReturnType(); 2214 2215 QualType T = e->getType(); 2216 2217 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2218 // defined as T&, otherwise decltype(e) is defined as T. 2219 if (e->isLvalue(Context) == Expr::LV_Valid) 2220 T = Context.getLValueReferenceType(T); 2221 2222 return T; 2223} 2224 2225/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2226/// DecltypeType AST's. The only motivation to unique these nodes would be 2227/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2228/// an issue. This doesn't effect the type checker, since it operates 2229/// on canonical type's (which are always unique). 2230QualType ASTContext::getDecltypeType(Expr *e) { 2231 DecltypeType *dt; 2232 if (e->isTypeDependent()) { 2233 llvm::FoldingSetNodeID ID; 2234 DependentDecltypeType::Profile(ID, *this, e); 2235 2236 void *InsertPos = 0; 2237 DependentDecltypeType *Canon 2238 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2239 if (Canon) { 2240 // We already have a "canonical" version of an equivalent, dependent 2241 // decltype type. Use that as our canonical type. 2242 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2243 QualType((DecltypeType*)Canon, 0)); 2244 } 2245 else { 2246 // Build a new, canonical typeof(expr) type. 2247 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2248 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2249 dt = Canon; 2250 } 2251 } else { 2252 QualType T = getDecltypeForExpr(e, *this); 2253 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2254 } 2255 Types.push_back(dt); 2256 return QualType(dt, 0); 2257} 2258 2259/// getTagDeclType - Return the unique reference to the type for the 2260/// specified TagDecl (struct/union/class/enum) decl. 2261QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2262 assert (Decl); 2263 // FIXME: What is the design on getTagDeclType when it requires casting 2264 // away const? mutable? 2265 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2266} 2267 2268/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2269/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2270/// needs to agree with the definition in <stddef.h>. 2271CanQualType ASTContext::getSizeType() const { 2272 return getFromTargetType(Target.getSizeType()); 2273} 2274 2275/// getSignedWCharType - Return the type of "signed wchar_t". 2276/// Used when in C++, as a GCC extension. 2277QualType ASTContext::getSignedWCharType() const { 2278 // FIXME: derive from "Target" ? 2279 return WCharTy; 2280} 2281 2282/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2283/// Used when in C++, as a GCC extension. 2284QualType ASTContext::getUnsignedWCharType() const { 2285 // FIXME: derive from "Target" ? 2286 return UnsignedIntTy; 2287} 2288 2289/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2290/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2291QualType ASTContext::getPointerDiffType() const { 2292 return getFromTargetType(Target.getPtrDiffType(0)); 2293} 2294 2295//===----------------------------------------------------------------------===// 2296// Type Operators 2297//===----------------------------------------------------------------------===// 2298 2299CanQualType ASTContext::getCanonicalParamType(QualType T) { 2300 // Push qualifiers into arrays, and then discard any remaining 2301 // qualifiers. 2302 T = getCanonicalType(T); 2303 const Type *Ty = T.getTypePtr(); 2304 2305 QualType Result; 2306 if (isa<ArrayType>(Ty)) { 2307 Result = getArrayDecayedType(QualType(Ty,0)); 2308 } else if (isa<FunctionType>(Ty)) { 2309 Result = getPointerType(QualType(Ty, 0)); 2310 } else { 2311 Result = QualType(Ty, 0); 2312 } 2313 2314 return CanQualType::CreateUnsafe(Result); 2315} 2316 2317/// getCanonicalType - Return the canonical (structural) type corresponding to 2318/// the specified potentially non-canonical type. The non-canonical version 2319/// of a type may have many "decorated" versions of types. Decorators can 2320/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2321/// to be free of any of these, allowing two canonical types to be compared 2322/// for exact equality with a simple pointer comparison. 2323CanQualType ASTContext::getCanonicalType(QualType T) { 2324 QualifierCollector Quals; 2325 const Type *Ptr = Quals.strip(T); 2326 QualType CanType = Ptr->getCanonicalTypeInternal(); 2327 2328 // The canonical internal type will be the canonical type *except* 2329 // that we push type qualifiers down through array types. 2330 2331 // If there are no new qualifiers to push down, stop here. 2332 if (!Quals.hasQualifiers()) 2333 return CanQualType::CreateUnsafe(CanType); 2334 2335 // If the type qualifiers are on an array type, get the canonical 2336 // type of the array with the qualifiers applied to the element 2337 // type. 2338 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2339 if (!AT) 2340 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2341 2342 // Get the canonical version of the element with the extra qualifiers on it. 2343 // This can recursively sink qualifiers through multiple levels of arrays. 2344 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2345 NewEltTy = getCanonicalType(NewEltTy); 2346 2347 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2348 return CanQualType::CreateUnsafe( 2349 getConstantArrayType(NewEltTy, CAT->getSize(), 2350 CAT->getSizeModifier(), 2351 CAT->getIndexTypeCVRQualifiers())); 2352 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2353 return CanQualType::CreateUnsafe( 2354 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2355 IAT->getIndexTypeCVRQualifiers())); 2356 2357 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2358 return CanQualType::CreateUnsafe( 2359 getDependentSizedArrayType(NewEltTy, 2360 DSAT->getSizeExpr() ? 2361 DSAT->getSizeExpr()->Retain() : 0, 2362 DSAT->getSizeModifier(), 2363 DSAT->getIndexTypeCVRQualifiers(), 2364 DSAT->getBracketsRange())->getCanonicalTypeInternal()); 2365 2366 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2367 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2368 VAT->getSizeExpr() ? 2369 VAT->getSizeExpr()->Retain() : 0, 2370 VAT->getSizeModifier(), 2371 VAT->getIndexTypeCVRQualifiers(), 2372 VAT->getBracketsRange())); 2373} 2374 2375QualType ASTContext::getUnqualifiedArrayType(QualType T, 2376 Qualifiers &Quals) { 2377 assert(T.isCanonical() && "Only operates on canonical types"); 2378 if (!isa<ArrayType>(T)) { 2379 Quals = T.getLocalQualifiers(); 2380 return T.getLocalUnqualifiedType(); 2381 } 2382 2383 assert(!T.hasQualifiers() && "canonical array type has qualifiers!"); 2384 const ArrayType *AT = cast<ArrayType>(T); 2385 QualType Elt = AT->getElementType(); 2386 QualType UnqualElt = getUnqualifiedArrayType(Elt, Quals); 2387 if (Elt == UnqualElt) 2388 return T; 2389 2390 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(T)) { 2391 return getConstantArrayType(UnqualElt, CAT->getSize(), 2392 CAT->getSizeModifier(), 0); 2393 } 2394 2395 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(T)) { 2396 return getIncompleteArrayType(UnqualElt, IAT->getSizeModifier(), 0); 2397 } 2398 2399 const DependentSizedArrayType *DSAT = cast<DependentSizedArrayType>(T); 2400 return getDependentSizedArrayType(UnqualElt, DSAT->getSizeExpr()->Retain(), 2401 DSAT->getSizeModifier(), 0, 2402 SourceRange()); 2403} 2404 2405DeclarationName ASTContext::getNameForTemplate(TemplateName Name) { 2406 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2407 return TD->getDeclName(); 2408 2409 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2410 if (DTN->isIdentifier()) { 2411 return DeclarationNames.getIdentifier(DTN->getIdentifier()); 2412 } else { 2413 return DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2414 } 2415 } 2416 2417 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2418 assert(Storage); 2419 return (*Storage->begin())->getDeclName(); 2420} 2421 2422TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2423 // If this template name refers to a template, the canonical 2424 // template name merely stores the template itself. 2425 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2426 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2427 2428 assert(!Name.getAsOverloadedTemplate()); 2429 2430 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2431 assert(DTN && "Non-dependent template names must refer to template decls."); 2432 return DTN->CanonicalTemplateName; 2433} 2434 2435bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2436 X = getCanonicalTemplateName(X); 2437 Y = getCanonicalTemplateName(Y); 2438 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2439} 2440 2441TemplateArgument 2442ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2443 switch (Arg.getKind()) { 2444 case TemplateArgument::Null: 2445 return Arg; 2446 2447 case TemplateArgument::Expression: 2448 return Arg; 2449 2450 case TemplateArgument::Declaration: 2451 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2452 2453 case TemplateArgument::Template: 2454 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2455 2456 case TemplateArgument::Integral: 2457 return TemplateArgument(*Arg.getAsIntegral(), 2458 getCanonicalType(Arg.getIntegralType())); 2459 2460 case TemplateArgument::Type: 2461 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2462 2463 case TemplateArgument::Pack: { 2464 // FIXME: Allocate in ASTContext 2465 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2466 unsigned Idx = 0; 2467 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2468 AEnd = Arg.pack_end(); 2469 A != AEnd; (void)++A, ++Idx) 2470 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2471 2472 TemplateArgument Result; 2473 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2474 return Result; 2475 } 2476 } 2477 2478 // Silence GCC warning 2479 assert(false && "Unhandled template argument kind"); 2480 return TemplateArgument(); 2481} 2482 2483NestedNameSpecifier * 2484ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2485 if (!NNS) 2486 return 0; 2487 2488 switch (NNS->getKind()) { 2489 case NestedNameSpecifier::Identifier: 2490 // Canonicalize the prefix but keep the identifier the same. 2491 return NestedNameSpecifier::Create(*this, 2492 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2493 NNS->getAsIdentifier()); 2494 2495 case NestedNameSpecifier::Namespace: 2496 // A namespace is canonical; build a nested-name-specifier with 2497 // this namespace and no prefix. 2498 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2499 2500 case NestedNameSpecifier::TypeSpec: 2501 case NestedNameSpecifier::TypeSpecWithTemplate: { 2502 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2503 return NestedNameSpecifier::Create(*this, 0, 2504 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2505 T.getTypePtr()); 2506 } 2507 2508 case NestedNameSpecifier::Global: 2509 // The global specifier is canonical and unique. 2510 return NNS; 2511 } 2512 2513 // Required to silence a GCC warning 2514 return 0; 2515} 2516 2517 2518const ArrayType *ASTContext::getAsArrayType(QualType T) { 2519 // Handle the non-qualified case efficiently. 2520 if (!T.hasLocalQualifiers()) { 2521 // Handle the common positive case fast. 2522 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2523 return AT; 2524 } 2525 2526 // Handle the common negative case fast. 2527 QualType CType = T->getCanonicalTypeInternal(); 2528 if (!isa<ArrayType>(CType)) 2529 return 0; 2530 2531 // Apply any qualifiers from the array type to the element type. This 2532 // implements C99 6.7.3p8: "If the specification of an array type includes 2533 // any type qualifiers, the element type is so qualified, not the array type." 2534 2535 // If we get here, we either have type qualifiers on the type, or we have 2536 // sugar such as a typedef in the way. If we have type qualifiers on the type 2537 // we must propagate them down into the element type. 2538 2539 QualifierCollector Qs; 2540 const Type *Ty = Qs.strip(T.getDesugaredType()); 2541 2542 // If we have a simple case, just return now. 2543 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2544 if (ATy == 0 || Qs.empty()) 2545 return ATy; 2546 2547 // Otherwise, we have an array and we have qualifiers on it. Push the 2548 // qualifiers into the array element type and return a new array type. 2549 // Get the canonical version of the element with the extra qualifiers on it. 2550 // This can recursively sink qualifiers through multiple levels of arrays. 2551 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2552 2553 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2554 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2555 CAT->getSizeModifier(), 2556 CAT->getIndexTypeCVRQualifiers())); 2557 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2558 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2559 IAT->getSizeModifier(), 2560 IAT->getIndexTypeCVRQualifiers())); 2561 2562 if (const DependentSizedArrayType *DSAT 2563 = dyn_cast<DependentSizedArrayType>(ATy)) 2564 return cast<ArrayType>( 2565 getDependentSizedArrayType(NewEltTy, 2566 DSAT->getSizeExpr() ? 2567 DSAT->getSizeExpr()->Retain() : 0, 2568 DSAT->getSizeModifier(), 2569 DSAT->getIndexTypeCVRQualifiers(), 2570 DSAT->getBracketsRange())); 2571 2572 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2573 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2574 VAT->getSizeExpr() ? 2575 VAT->getSizeExpr()->Retain() : 0, 2576 VAT->getSizeModifier(), 2577 VAT->getIndexTypeCVRQualifiers(), 2578 VAT->getBracketsRange())); 2579} 2580 2581 2582/// getArrayDecayedType - Return the properly qualified result of decaying the 2583/// specified array type to a pointer. This operation is non-trivial when 2584/// handling typedefs etc. The canonical type of "T" must be an array type, 2585/// this returns a pointer to a properly qualified element of the array. 2586/// 2587/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2588QualType ASTContext::getArrayDecayedType(QualType Ty) { 2589 // Get the element type with 'getAsArrayType' so that we don't lose any 2590 // typedefs in the element type of the array. This also handles propagation 2591 // of type qualifiers from the array type into the element type if present 2592 // (C99 6.7.3p8). 2593 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2594 assert(PrettyArrayType && "Not an array type!"); 2595 2596 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2597 2598 // int x[restrict 4] -> int *restrict 2599 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2600} 2601 2602QualType ASTContext::getBaseElementType(QualType QT) { 2603 QualifierCollector Qs; 2604 while (true) { 2605 const Type *UT = Qs.strip(QT); 2606 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2607 QT = AT->getElementType(); 2608 } else { 2609 return Qs.apply(QT); 2610 } 2611 } 2612} 2613 2614QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2615 QualType ElemTy = AT->getElementType(); 2616 2617 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2618 return getBaseElementType(AT); 2619 2620 return ElemTy; 2621} 2622 2623/// getConstantArrayElementCount - Returns number of constant array elements. 2624uint64_t 2625ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2626 uint64_t ElementCount = 1; 2627 do { 2628 ElementCount *= CA->getSize().getZExtValue(); 2629 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2630 } while (CA); 2631 return ElementCount; 2632} 2633 2634/// getFloatingRank - Return a relative rank for floating point types. 2635/// This routine will assert if passed a built-in type that isn't a float. 2636static FloatingRank getFloatingRank(QualType T) { 2637 if (const ComplexType *CT = T->getAs<ComplexType>()) 2638 return getFloatingRank(CT->getElementType()); 2639 2640 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2641 switch (T->getAs<BuiltinType>()->getKind()) { 2642 default: assert(0 && "getFloatingRank(): not a floating type"); 2643 case BuiltinType::Float: return FloatRank; 2644 case BuiltinType::Double: return DoubleRank; 2645 case BuiltinType::LongDouble: return LongDoubleRank; 2646 } 2647} 2648 2649/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2650/// point or a complex type (based on typeDomain/typeSize). 2651/// 'typeDomain' is a real floating point or complex type. 2652/// 'typeSize' is a real floating point or complex type. 2653QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2654 QualType Domain) const { 2655 FloatingRank EltRank = getFloatingRank(Size); 2656 if (Domain->isComplexType()) { 2657 switch (EltRank) { 2658 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2659 case FloatRank: return FloatComplexTy; 2660 case DoubleRank: return DoubleComplexTy; 2661 case LongDoubleRank: return LongDoubleComplexTy; 2662 } 2663 } 2664 2665 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2666 switch (EltRank) { 2667 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2668 case FloatRank: return FloatTy; 2669 case DoubleRank: return DoubleTy; 2670 case LongDoubleRank: return LongDoubleTy; 2671 } 2672} 2673 2674/// getFloatingTypeOrder - Compare the rank of the two specified floating 2675/// point types, ignoring the domain of the type (i.e. 'double' == 2676/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2677/// LHS < RHS, return -1. 2678int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2679 FloatingRank LHSR = getFloatingRank(LHS); 2680 FloatingRank RHSR = getFloatingRank(RHS); 2681 2682 if (LHSR == RHSR) 2683 return 0; 2684 if (LHSR > RHSR) 2685 return 1; 2686 return -1; 2687} 2688 2689/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2690/// routine will assert if passed a built-in type that isn't an integer or enum, 2691/// or if it is not canonicalized. 2692unsigned ASTContext::getIntegerRank(Type *T) { 2693 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 2694 if (EnumType* ET = dyn_cast<EnumType>(T)) 2695 T = ET->getDecl()->getPromotionType().getTypePtr(); 2696 2697 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2698 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2699 2700 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2701 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2702 2703 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2704 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2705 2706 switch (cast<BuiltinType>(T)->getKind()) { 2707 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2708 case BuiltinType::Bool: 2709 return 1 + (getIntWidth(BoolTy) << 3); 2710 case BuiltinType::Char_S: 2711 case BuiltinType::Char_U: 2712 case BuiltinType::SChar: 2713 case BuiltinType::UChar: 2714 return 2 + (getIntWidth(CharTy) << 3); 2715 case BuiltinType::Short: 2716 case BuiltinType::UShort: 2717 return 3 + (getIntWidth(ShortTy) << 3); 2718 case BuiltinType::Int: 2719 case BuiltinType::UInt: 2720 return 4 + (getIntWidth(IntTy) << 3); 2721 case BuiltinType::Long: 2722 case BuiltinType::ULong: 2723 return 5 + (getIntWidth(LongTy) << 3); 2724 case BuiltinType::LongLong: 2725 case BuiltinType::ULongLong: 2726 return 6 + (getIntWidth(LongLongTy) << 3); 2727 case BuiltinType::Int128: 2728 case BuiltinType::UInt128: 2729 return 7 + (getIntWidth(Int128Ty) << 3); 2730 } 2731} 2732 2733/// \brief Whether this is a promotable bitfield reference according 2734/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2735/// 2736/// \returns the type this bit-field will promote to, or NULL if no 2737/// promotion occurs. 2738QualType ASTContext::isPromotableBitField(Expr *E) { 2739 FieldDecl *Field = E->getBitField(); 2740 if (!Field) 2741 return QualType(); 2742 2743 QualType FT = Field->getType(); 2744 2745 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2746 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2747 uint64_t IntSize = getTypeSize(IntTy); 2748 // GCC extension compatibility: if the bit-field size is less than or equal 2749 // to the size of int, it gets promoted no matter what its type is. 2750 // For instance, unsigned long bf : 4 gets promoted to signed int. 2751 if (BitWidth < IntSize) 2752 return IntTy; 2753 2754 if (BitWidth == IntSize) 2755 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2756 2757 // Types bigger than int are not subject to promotions, and therefore act 2758 // like the base type. 2759 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2760 // is ridiculous. 2761 return QualType(); 2762} 2763 2764/// getPromotedIntegerType - Returns the type that Promotable will 2765/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2766/// integer type. 2767QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2768 assert(!Promotable.isNull()); 2769 assert(Promotable->isPromotableIntegerType()); 2770 if (const EnumType *ET = Promotable->getAs<EnumType>()) 2771 return ET->getDecl()->getPromotionType(); 2772 if (Promotable->isSignedIntegerType()) 2773 return IntTy; 2774 uint64_t PromotableSize = getTypeSize(Promotable); 2775 uint64_t IntSize = getTypeSize(IntTy); 2776 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2777 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2778} 2779 2780/// getIntegerTypeOrder - Returns the highest ranked integer type: 2781/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2782/// LHS < RHS, return -1. 2783int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2784 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2785 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2786 if (LHSC == RHSC) return 0; 2787 2788 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2789 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2790 2791 unsigned LHSRank = getIntegerRank(LHSC); 2792 unsigned RHSRank = getIntegerRank(RHSC); 2793 2794 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2795 if (LHSRank == RHSRank) return 0; 2796 return LHSRank > RHSRank ? 1 : -1; 2797 } 2798 2799 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2800 if (LHSUnsigned) { 2801 // If the unsigned [LHS] type is larger, return it. 2802 if (LHSRank >= RHSRank) 2803 return 1; 2804 2805 // If the signed type can represent all values of the unsigned type, it 2806 // wins. Because we are dealing with 2's complement and types that are 2807 // powers of two larger than each other, this is always safe. 2808 return -1; 2809 } 2810 2811 // If the unsigned [RHS] type is larger, return it. 2812 if (RHSRank >= LHSRank) 2813 return -1; 2814 2815 // If the signed type can represent all values of the unsigned type, it 2816 // wins. Because we are dealing with 2's complement and types that are 2817 // powers of two larger than each other, this is always safe. 2818 return 1; 2819} 2820 2821static RecordDecl * 2822CreateRecordDecl(ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 2823 SourceLocation L, IdentifierInfo *Id) { 2824 if (Ctx.getLangOptions().CPlusPlus) 2825 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 2826 else 2827 return RecordDecl::Create(Ctx, TK, DC, L, Id); 2828} 2829 2830// getCFConstantStringType - Return the type used for constant CFStrings. 2831QualType ASTContext::getCFConstantStringType() { 2832 if (!CFConstantStringTypeDecl) { 2833 CFConstantStringTypeDecl = 2834 CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2835 &Idents.get("NSConstantString")); 2836 2837 QualType FieldTypes[4]; 2838 2839 // const int *isa; 2840 FieldTypes[0] = getPointerType(IntTy.withConst()); 2841 // int flags; 2842 FieldTypes[1] = IntTy; 2843 // const char *str; 2844 FieldTypes[2] = getPointerType(CharTy.withConst()); 2845 // long length; 2846 FieldTypes[3] = LongTy; 2847 2848 // Create fields 2849 for (unsigned i = 0; i < 4; ++i) { 2850 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2851 SourceLocation(), 0, 2852 FieldTypes[i], /*TInfo=*/0, 2853 /*BitWidth=*/0, 2854 /*Mutable=*/false); 2855 CFConstantStringTypeDecl->addDecl(Field); 2856 } 2857 2858 CFConstantStringTypeDecl->completeDefinition(*this); 2859 } 2860 2861 return getTagDeclType(CFConstantStringTypeDecl); 2862} 2863 2864void ASTContext::setCFConstantStringType(QualType T) { 2865 const RecordType *Rec = T->getAs<RecordType>(); 2866 assert(Rec && "Invalid CFConstantStringType"); 2867 CFConstantStringTypeDecl = Rec->getDecl(); 2868} 2869 2870QualType ASTContext::getObjCFastEnumerationStateType() { 2871 if (!ObjCFastEnumerationStateTypeDecl) { 2872 ObjCFastEnumerationStateTypeDecl = 2873 CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2874 &Idents.get("__objcFastEnumerationState")); 2875 2876 QualType FieldTypes[] = { 2877 UnsignedLongTy, 2878 getPointerType(ObjCIdTypedefType), 2879 getPointerType(UnsignedLongTy), 2880 getConstantArrayType(UnsignedLongTy, 2881 llvm::APInt(32, 5), ArrayType::Normal, 0) 2882 }; 2883 2884 for (size_t i = 0; i < 4; ++i) { 2885 FieldDecl *Field = FieldDecl::Create(*this, 2886 ObjCFastEnumerationStateTypeDecl, 2887 SourceLocation(), 0, 2888 FieldTypes[i], /*TInfo=*/0, 2889 /*BitWidth=*/0, 2890 /*Mutable=*/false); 2891 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2892 } 2893 2894 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2895 } 2896 2897 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2898} 2899 2900QualType ASTContext::getBlockDescriptorType() { 2901 if (BlockDescriptorType) 2902 return getTagDeclType(BlockDescriptorType); 2903 2904 RecordDecl *T; 2905 // FIXME: Needs the FlagAppleBlock bit. 2906 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2907 &Idents.get("__block_descriptor")); 2908 2909 QualType FieldTypes[] = { 2910 UnsignedLongTy, 2911 UnsignedLongTy, 2912 }; 2913 2914 const char *FieldNames[] = { 2915 "reserved", 2916 "Size" 2917 }; 2918 2919 for (size_t i = 0; i < 2; ++i) { 2920 FieldDecl *Field = FieldDecl::Create(*this, 2921 T, 2922 SourceLocation(), 2923 &Idents.get(FieldNames[i]), 2924 FieldTypes[i], /*TInfo=*/0, 2925 /*BitWidth=*/0, 2926 /*Mutable=*/false); 2927 T->addDecl(Field); 2928 } 2929 2930 T->completeDefinition(*this); 2931 2932 BlockDescriptorType = T; 2933 2934 return getTagDeclType(BlockDescriptorType); 2935} 2936 2937void ASTContext::setBlockDescriptorType(QualType T) { 2938 const RecordType *Rec = T->getAs<RecordType>(); 2939 assert(Rec && "Invalid BlockDescriptorType"); 2940 BlockDescriptorType = Rec->getDecl(); 2941} 2942 2943QualType ASTContext::getBlockDescriptorExtendedType() { 2944 if (BlockDescriptorExtendedType) 2945 return getTagDeclType(BlockDescriptorExtendedType); 2946 2947 RecordDecl *T; 2948 // FIXME: Needs the FlagAppleBlock bit. 2949 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2950 &Idents.get("__block_descriptor_withcopydispose")); 2951 2952 QualType FieldTypes[] = { 2953 UnsignedLongTy, 2954 UnsignedLongTy, 2955 getPointerType(VoidPtrTy), 2956 getPointerType(VoidPtrTy) 2957 }; 2958 2959 const char *FieldNames[] = { 2960 "reserved", 2961 "Size", 2962 "CopyFuncPtr", 2963 "DestroyFuncPtr" 2964 }; 2965 2966 for (size_t i = 0; i < 4; ++i) { 2967 FieldDecl *Field = FieldDecl::Create(*this, 2968 T, 2969 SourceLocation(), 2970 &Idents.get(FieldNames[i]), 2971 FieldTypes[i], /*TInfo=*/0, 2972 /*BitWidth=*/0, 2973 /*Mutable=*/false); 2974 T->addDecl(Field); 2975 } 2976 2977 T->completeDefinition(*this); 2978 2979 BlockDescriptorExtendedType = T; 2980 2981 return getTagDeclType(BlockDescriptorExtendedType); 2982} 2983 2984void ASTContext::setBlockDescriptorExtendedType(QualType T) { 2985 const RecordType *Rec = T->getAs<RecordType>(); 2986 assert(Rec && "Invalid BlockDescriptorType"); 2987 BlockDescriptorExtendedType = Rec->getDecl(); 2988} 2989 2990bool ASTContext::BlockRequiresCopying(QualType Ty) { 2991 if (Ty->isBlockPointerType()) 2992 return true; 2993 if (isObjCNSObjectType(Ty)) 2994 return true; 2995 if (Ty->isObjCObjectPointerType()) 2996 return true; 2997 return false; 2998} 2999 3000QualType ASTContext::BuildByRefType(const char *DeclName, QualType Ty) { 3001 // type = struct __Block_byref_1_X { 3002 // void *__isa; 3003 // struct __Block_byref_1_X *__forwarding; 3004 // unsigned int __flags; 3005 // unsigned int __size; 3006 // void *__copy_helper; // as needed 3007 // void *__destroy_help // as needed 3008 // int X; 3009 // } * 3010 3011 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 3012 3013 // FIXME: Move up 3014 static unsigned int UniqueBlockByRefTypeID = 0; 3015 llvm::SmallString<36> Name; 3016 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 3017 ++UniqueBlockByRefTypeID << '_' << DeclName; 3018 RecordDecl *T; 3019 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 3020 &Idents.get(Name.str())); 3021 T->startDefinition(); 3022 QualType Int32Ty = IntTy; 3023 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 3024 QualType FieldTypes[] = { 3025 getPointerType(VoidPtrTy), 3026 getPointerType(getTagDeclType(T)), 3027 Int32Ty, 3028 Int32Ty, 3029 getPointerType(VoidPtrTy), 3030 getPointerType(VoidPtrTy), 3031 Ty 3032 }; 3033 3034 const char *FieldNames[] = { 3035 "__isa", 3036 "__forwarding", 3037 "__flags", 3038 "__size", 3039 "__copy_helper", 3040 "__destroy_helper", 3041 DeclName, 3042 }; 3043 3044 for (size_t i = 0; i < 7; ++i) { 3045 if (!HasCopyAndDispose && i >=4 && i <= 5) 3046 continue; 3047 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3048 &Idents.get(FieldNames[i]), 3049 FieldTypes[i], /*TInfo=*/0, 3050 /*BitWidth=*/0, /*Mutable=*/false); 3051 T->addDecl(Field); 3052 } 3053 3054 T->completeDefinition(*this); 3055 3056 return getPointerType(getTagDeclType(T)); 3057} 3058 3059 3060QualType ASTContext::getBlockParmType( 3061 bool BlockHasCopyDispose, 3062 llvm::SmallVector<const Expr *, 8> &BlockDeclRefDecls) { 3063 // FIXME: Move up 3064 static unsigned int UniqueBlockParmTypeID = 0; 3065 llvm::SmallString<36> Name; 3066 llvm::raw_svector_ostream(Name) << "__block_literal_" 3067 << ++UniqueBlockParmTypeID; 3068 RecordDecl *T; 3069 T = CreateRecordDecl(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 3070 &Idents.get(Name.str())); 3071 QualType FieldTypes[] = { 3072 getPointerType(VoidPtrTy), 3073 IntTy, 3074 IntTy, 3075 getPointerType(VoidPtrTy), 3076 (BlockHasCopyDispose ? 3077 getPointerType(getBlockDescriptorExtendedType()) : 3078 getPointerType(getBlockDescriptorType())) 3079 }; 3080 3081 const char *FieldNames[] = { 3082 "__isa", 3083 "__flags", 3084 "__reserved", 3085 "__FuncPtr", 3086 "__descriptor" 3087 }; 3088 3089 for (size_t i = 0; i < 5; ++i) { 3090 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3091 &Idents.get(FieldNames[i]), 3092 FieldTypes[i], /*TInfo=*/0, 3093 /*BitWidth=*/0, /*Mutable=*/false); 3094 T->addDecl(Field); 3095 } 3096 3097 for (size_t i = 0; i < BlockDeclRefDecls.size(); ++i) { 3098 const Expr *E = BlockDeclRefDecls[i]; 3099 const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); 3100 clang::IdentifierInfo *Name = 0; 3101 if (BDRE) { 3102 const ValueDecl *D = BDRE->getDecl(); 3103 Name = &Idents.get(D->getName()); 3104 } 3105 QualType FieldType = E->getType(); 3106 3107 if (BDRE && BDRE->isByRef()) 3108 FieldType = BuildByRefType(BDRE->getDecl()->getNameAsCString(), 3109 FieldType); 3110 3111 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3112 Name, FieldType, /*TInfo=*/0, 3113 /*BitWidth=*/0, /*Mutable=*/false); 3114 T->addDecl(Field); 3115 } 3116 3117 T->completeDefinition(*this); 3118 3119 return getPointerType(getTagDeclType(T)); 3120} 3121 3122void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3123 const RecordType *Rec = T->getAs<RecordType>(); 3124 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3125 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3126} 3127 3128// This returns true if a type has been typedefed to BOOL: 3129// typedef <type> BOOL; 3130static bool isTypeTypedefedAsBOOL(QualType T) { 3131 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3132 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3133 return II->isStr("BOOL"); 3134 3135 return false; 3136} 3137 3138/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3139/// purpose. 3140CharUnits ASTContext::getObjCEncodingTypeSize(QualType type) { 3141 CharUnits sz = getTypeSizeInChars(type); 3142 3143 // Make all integer and enum types at least as large as an int 3144 if (sz.isPositive() && type->isIntegralType()) 3145 sz = std::max(sz, getTypeSizeInChars(IntTy)); 3146 // Treat arrays as pointers, since that's how they're passed in. 3147 else if (type->isArrayType()) 3148 sz = getTypeSizeInChars(VoidPtrTy); 3149 return sz; 3150} 3151 3152static inline 3153std::string charUnitsToString(const CharUnits &CU) { 3154 return llvm::itostr(CU.getQuantity()); 3155} 3156 3157/// getObjCEncodingForBlockDecl - Return the encoded type for this method 3158/// declaration. 3159void ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr, 3160 std::string& S) { 3161 const BlockDecl *Decl = Expr->getBlockDecl(); 3162 QualType BlockTy = 3163 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3164 // Encode result type. 3165 getObjCEncodingForType(cast<FunctionType>(BlockTy)->getResultType(), S); 3166 // Compute size of all parameters. 3167 // Start with computing size of a pointer in number of bytes. 3168 // FIXME: There might(should) be a better way of doing this computation! 3169 SourceLocation Loc; 3170 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3171 CharUnits ParmOffset = PtrSize; 3172 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3173 E = Decl->param_end(); PI != E; ++PI) { 3174 QualType PType = (*PI)->getType(); 3175 CharUnits sz = getObjCEncodingTypeSize(PType); 3176 assert (sz.isPositive() && "BlockExpr - Incomplete param type"); 3177 ParmOffset += sz; 3178 } 3179 // Size of the argument frame 3180 S += charUnitsToString(ParmOffset); 3181 // Block pointer and offset. 3182 S += "@?0"; 3183 ParmOffset = PtrSize; 3184 3185 // Argument types. 3186 ParmOffset = PtrSize; 3187 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3188 Decl->param_end(); PI != E; ++PI) { 3189 ParmVarDecl *PVDecl = *PI; 3190 QualType PType = PVDecl->getOriginalType(); 3191 if (const ArrayType *AT = 3192 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3193 // Use array's original type only if it has known number of 3194 // elements. 3195 if (!isa<ConstantArrayType>(AT)) 3196 PType = PVDecl->getType(); 3197 } else if (PType->isFunctionType()) 3198 PType = PVDecl->getType(); 3199 getObjCEncodingForType(PType, S); 3200 S += charUnitsToString(ParmOffset); 3201 ParmOffset += getObjCEncodingTypeSize(PType); 3202 } 3203} 3204 3205/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3206/// declaration. 3207void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3208 std::string& S) { 3209 // FIXME: This is not very efficient. 3210 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3211 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3212 // Encode result type. 3213 getObjCEncodingForType(Decl->getResultType(), S); 3214 // Compute size of all parameters. 3215 // Start with computing size of a pointer in number of bytes. 3216 // FIXME: There might(should) be a better way of doing this computation! 3217 SourceLocation Loc; 3218 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3219 // The first two arguments (self and _cmd) are pointers; account for 3220 // their size. 3221 CharUnits ParmOffset = 2 * PtrSize; 3222 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3223 E = Decl->param_end(); PI != E; ++PI) { 3224 QualType PType = (*PI)->getType(); 3225 CharUnits sz = getObjCEncodingTypeSize(PType); 3226 assert (sz.isPositive() && 3227 "getObjCEncodingForMethodDecl - Incomplete param type"); 3228 ParmOffset += sz; 3229 } 3230 S += charUnitsToString(ParmOffset); 3231 S += "@0:"; 3232 S += charUnitsToString(PtrSize); 3233 3234 // Argument types. 3235 ParmOffset = 2 * PtrSize; 3236 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3237 E = Decl->param_end(); PI != E; ++PI) { 3238 ParmVarDecl *PVDecl = *PI; 3239 QualType PType = PVDecl->getOriginalType(); 3240 if (const ArrayType *AT = 3241 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3242 // Use array's original type only if it has known number of 3243 // elements. 3244 if (!isa<ConstantArrayType>(AT)) 3245 PType = PVDecl->getType(); 3246 } else if (PType->isFunctionType()) 3247 PType = PVDecl->getType(); 3248 // Process argument qualifiers for user supplied arguments; such as, 3249 // 'in', 'inout', etc. 3250 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3251 getObjCEncodingForType(PType, S); 3252 S += charUnitsToString(ParmOffset); 3253 ParmOffset += getObjCEncodingTypeSize(PType); 3254 } 3255} 3256 3257/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3258/// property declaration. If non-NULL, Container must be either an 3259/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3260/// NULL when getting encodings for protocol properties. 3261/// Property attributes are stored as a comma-delimited C string. The simple 3262/// attributes readonly and bycopy are encoded as single characters. The 3263/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3264/// encoded as single characters, followed by an identifier. Property types 3265/// are also encoded as a parametrized attribute. The characters used to encode 3266/// these attributes are defined by the following enumeration: 3267/// @code 3268/// enum PropertyAttributes { 3269/// kPropertyReadOnly = 'R', // property is read-only. 3270/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3271/// kPropertyByref = '&', // property is a reference to the value last assigned 3272/// kPropertyDynamic = 'D', // property is dynamic 3273/// kPropertyGetter = 'G', // followed by getter selector name 3274/// kPropertySetter = 'S', // followed by setter selector name 3275/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3276/// kPropertyType = 't' // followed by old-style type encoding. 3277/// kPropertyWeak = 'W' // 'weak' property 3278/// kPropertyStrong = 'P' // property GC'able 3279/// kPropertyNonAtomic = 'N' // property non-atomic 3280/// }; 3281/// @endcode 3282void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3283 const Decl *Container, 3284 std::string& S) { 3285 // Collect information from the property implementation decl(s). 3286 bool Dynamic = false; 3287 ObjCPropertyImplDecl *SynthesizePID = 0; 3288 3289 // FIXME: Duplicated code due to poor abstraction. 3290 if (Container) { 3291 if (const ObjCCategoryImplDecl *CID = 3292 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3293 for (ObjCCategoryImplDecl::propimpl_iterator 3294 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3295 i != e; ++i) { 3296 ObjCPropertyImplDecl *PID = *i; 3297 if (PID->getPropertyDecl() == PD) { 3298 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3299 Dynamic = true; 3300 } else { 3301 SynthesizePID = PID; 3302 } 3303 } 3304 } 3305 } else { 3306 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3307 for (ObjCCategoryImplDecl::propimpl_iterator 3308 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3309 i != e; ++i) { 3310 ObjCPropertyImplDecl *PID = *i; 3311 if (PID->getPropertyDecl() == PD) { 3312 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3313 Dynamic = true; 3314 } else { 3315 SynthesizePID = PID; 3316 } 3317 } 3318 } 3319 } 3320 } 3321 3322 // FIXME: This is not very efficient. 3323 S = "T"; 3324 3325 // Encode result type. 3326 // GCC has some special rules regarding encoding of properties which 3327 // closely resembles encoding of ivars. 3328 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3329 true /* outermost type */, 3330 true /* encoding for property */); 3331 3332 if (PD->isReadOnly()) { 3333 S += ",R"; 3334 } else { 3335 switch (PD->getSetterKind()) { 3336 case ObjCPropertyDecl::Assign: break; 3337 case ObjCPropertyDecl::Copy: S += ",C"; break; 3338 case ObjCPropertyDecl::Retain: S += ",&"; break; 3339 } 3340 } 3341 3342 // It really isn't clear at all what this means, since properties 3343 // are "dynamic by default". 3344 if (Dynamic) 3345 S += ",D"; 3346 3347 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3348 S += ",N"; 3349 3350 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3351 S += ",G"; 3352 S += PD->getGetterName().getAsString(); 3353 } 3354 3355 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3356 S += ",S"; 3357 S += PD->getSetterName().getAsString(); 3358 } 3359 3360 if (SynthesizePID) { 3361 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3362 S += ",V"; 3363 S += OID->getNameAsString(); 3364 } 3365 3366 // FIXME: OBJCGC: weak & strong 3367} 3368 3369/// getLegacyIntegralTypeEncoding - 3370/// Another legacy compatibility encoding: 32-bit longs are encoded as 3371/// 'l' or 'L' , but not always. For typedefs, we need to use 3372/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3373/// 3374void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3375 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3376 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3377 if (BT->getKind() == BuiltinType::ULong && 3378 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3379 PointeeTy = UnsignedIntTy; 3380 else 3381 if (BT->getKind() == BuiltinType::Long && 3382 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3383 PointeeTy = IntTy; 3384 } 3385 } 3386} 3387 3388void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3389 const FieldDecl *Field) { 3390 // We follow the behavior of gcc, expanding structures which are 3391 // directly pointed to, and expanding embedded structures. Note that 3392 // these rules are sufficient to prevent recursive encoding of the 3393 // same type. 3394 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3395 true /* outermost type */); 3396} 3397 3398static void EncodeBitField(const ASTContext *Context, std::string& S, 3399 const FieldDecl *FD) { 3400 const Expr *E = FD->getBitWidth(); 3401 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3402 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3403 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3404 S += 'b'; 3405 S += llvm::utostr(N); 3406} 3407 3408// FIXME: Use SmallString for accumulating string. 3409void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3410 bool ExpandPointedToStructures, 3411 bool ExpandStructures, 3412 const FieldDecl *FD, 3413 bool OutermostType, 3414 bool EncodingProperty) { 3415 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3416 if (FD && FD->isBitField()) 3417 return EncodeBitField(this, S, FD); 3418 char encoding; 3419 switch (BT->getKind()) { 3420 default: assert(0 && "Unhandled builtin type kind"); 3421 case BuiltinType::Void: encoding = 'v'; break; 3422 case BuiltinType::Bool: encoding = 'B'; break; 3423 case BuiltinType::Char_U: 3424 case BuiltinType::UChar: encoding = 'C'; break; 3425 case BuiltinType::UShort: encoding = 'S'; break; 3426 case BuiltinType::UInt: encoding = 'I'; break; 3427 case BuiltinType::ULong: 3428 encoding = 3429 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3430 break; 3431 case BuiltinType::UInt128: encoding = 'T'; break; 3432 case BuiltinType::ULongLong: encoding = 'Q'; break; 3433 case BuiltinType::Char_S: 3434 case BuiltinType::SChar: encoding = 'c'; break; 3435 case BuiltinType::Short: encoding = 's'; break; 3436 case BuiltinType::Int: encoding = 'i'; break; 3437 case BuiltinType::Long: 3438 encoding = 3439 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3440 break; 3441 case BuiltinType::LongLong: encoding = 'q'; break; 3442 case BuiltinType::Int128: encoding = 't'; break; 3443 case BuiltinType::Float: encoding = 'f'; break; 3444 case BuiltinType::Double: encoding = 'd'; break; 3445 case BuiltinType::LongDouble: encoding = 'd'; break; 3446 } 3447 3448 S += encoding; 3449 return; 3450 } 3451 3452 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3453 S += 'j'; 3454 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3455 false); 3456 return; 3457 } 3458 3459 if (const PointerType *PT = T->getAs<PointerType>()) { 3460 if (PT->isObjCSelType()) { 3461 S += ':'; 3462 return; 3463 } 3464 QualType PointeeTy = PT->getPointeeType(); 3465 3466 bool isReadOnly = false; 3467 // For historical/compatibility reasons, the read-only qualifier of the 3468 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3469 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3470 // Also, do not emit the 'r' for anything but the outermost type! 3471 if (isa<TypedefType>(T.getTypePtr())) { 3472 if (OutermostType && T.isConstQualified()) { 3473 isReadOnly = true; 3474 S += 'r'; 3475 } 3476 } else if (OutermostType) { 3477 QualType P = PointeeTy; 3478 while (P->getAs<PointerType>()) 3479 P = P->getAs<PointerType>()->getPointeeType(); 3480 if (P.isConstQualified()) { 3481 isReadOnly = true; 3482 S += 'r'; 3483 } 3484 } 3485 if (isReadOnly) { 3486 // Another legacy compatibility encoding. Some ObjC qualifier and type 3487 // combinations need to be rearranged. 3488 // Rewrite "in const" from "nr" to "rn" 3489 const char * s = S.c_str(); 3490 int len = S.length(); 3491 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3492 std::string replace = "rn"; 3493 S.replace(S.end()-2, S.end(), replace); 3494 } 3495 } 3496 3497 if (PointeeTy->isCharType()) { 3498 // char pointer types should be encoded as '*' unless it is a 3499 // type that has been typedef'd to 'BOOL'. 3500 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3501 S += '*'; 3502 return; 3503 } 3504 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3505 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3506 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3507 S += '#'; 3508 return; 3509 } 3510 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3511 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3512 S += '@'; 3513 return; 3514 } 3515 // fall through... 3516 } 3517 S += '^'; 3518 getLegacyIntegralTypeEncoding(PointeeTy); 3519 3520 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3521 NULL); 3522 return; 3523 } 3524 3525 if (const ArrayType *AT = 3526 // Ignore type qualifiers etc. 3527 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3528 if (isa<IncompleteArrayType>(AT)) { 3529 // Incomplete arrays are encoded as a pointer to the array element. 3530 S += '^'; 3531 3532 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3533 false, ExpandStructures, FD); 3534 } else { 3535 S += '['; 3536 3537 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3538 S += llvm::utostr(CAT->getSize().getZExtValue()); 3539 else { 3540 //Variable length arrays are encoded as a regular array with 0 elements. 3541 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3542 S += '0'; 3543 } 3544 3545 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3546 false, ExpandStructures, FD); 3547 S += ']'; 3548 } 3549 return; 3550 } 3551 3552 if (T->getAs<FunctionType>()) { 3553 S += '?'; 3554 return; 3555 } 3556 3557 if (const RecordType *RTy = T->getAs<RecordType>()) { 3558 RecordDecl *RDecl = RTy->getDecl(); 3559 S += RDecl->isUnion() ? '(' : '{'; 3560 // Anonymous structures print as '?' 3561 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3562 S += II->getName(); 3563 } else { 3564 S += '?'; 3565 } 3566 if (ExpandStructures) { 3567 S += '='; 3568 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3569 FieldEnd = RDecl->field_end(); 3570 Field != FieldEnd; ++Field) { 3571 if (FD) { 3572 S += '"'; 3573 S += Field->getNameAsString(); 3574 S += '"'; 3575 } 3576 3577 // Special case bit-fields. 3578 if (Field->isBitField()) { 3579 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3580 (*Field)); 3581 } else { 3582 QualType qt = Field->getType(); 3583 getLegacyIntegralTypeEncoding(qt); 3584 getObjCEncodingForTypeImpl(qt, S, false, true, 3585 FD); 3586 } 3587 } 3588 } 3589 S += RDecl->isUnion() ? ')' : '}'; 3590 return; 3591 } 3592 3593 if (T->isEnumeralType()) { 3594 if (FD && FD->isBitField()) 3595 EncodeBitField(this, S, FD); 3596 else 3597 S += 'i'; 3598 return; 3599 } 3600 3601 if (T->isBlockPointerType()) { 3602 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3603 return; 3604 } 3605 3606 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3607 // @encode(class_name) 3608 ObjCInterfaceDecl *OI = OIT->getDecl(); 3609 S += '{'; 3610 const IdentifierInfo *II = OI->getIdentifier(); 3611 S += II->getName(); 3612 S += '='; 3613 llvm::SmallVector<FieldDecl*, 32> RecFields; 3614 CollectObjCIvars(OI, RecFields); 3615 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3616 if (RecFields[i]->isBitField()) 3617 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3618 RecFields[i]); 3619 else 3620 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3621 FD); 3622 } 3623 S += '}'; 3624 return; 3625 } 3626 3627 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3628 if (OPT->isObjCIdType()) { 3629 S += '@'; 3630 return; 3631 } 3632 3633 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 3634 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 3635 // Since this is a binary compatibility issue, need to consult with runtime 3636 // folks. Fortunately, this is a *very* obsure construct. 3637 S += '#'; 3638 return; 3639 } 3640 3641 if (OPT->isObjCQualifiedIdType()) { 3642 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3643 ExpandPointedToStructures, 3644 ExpandStructures, FD); 3645 if (FD || EncodingProperty) { 3646 // Note that we do extended encoding of protocol qualifer list 3647 // Only when doing ivar or property encoding. 3648 S += '"'; 3649 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3650 E = OPT->qual_end(); I != E; ++I) { 3651 S += '<'; 3652 S += (*I)->getNameAsString(); 3653 S += '>'; 3654 } 3655 S += '"'; 3656 } 3657 return; 3658 } 3659 3660 QualType PointeeTy = OPT->getPointeeType(); 3661 if (!EncodingProperty && 3662 isa<TypedefType>(PointeeTy.getTypePtr())) { 3663 // Another historical/compatibility reason. 3664 // We encode the underlying type which comes out as 3665 // {...}; 3666 S += '^'; 3667 getObjCEncodingForTypeImpl(PointeeTy, S, 3668 false, ExpandPointedToStructures, 3669 NULL); 3670 return; 3671 } 3672 3673 S += '@'; 3674 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 3675 S += '"'; 3676 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 3677 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3678 E = OPT->qual_end(); I != E; ++I) { 3679 S += '<'; 3680 S += (*I)->getNameAsString(); 3681 S += '>'; 3682 } 3683 S += '"'; 3684 } 3685 return; 3686 } 3687 3688 assert(0 && "@encode for type not implemented!"); 3689} 3690 3691void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3692 std::string& S) const { 3693 if (QT & Decl::OBJC_TQ_In) 3694 S += 'n'; 3695 if (QT & Decl::OBJC_TQ_Inout) 3696 S += 'N'; 3697 if (QT & Decl::OBJC_TQ_Out) 3698 S += 'o'; 3699 if (QT & Decl::OBJC_TQ_Bycopy) 3700 S += 'O'; 3701 if (QT & Decl::OBJC_TQ_Byref) 3702 S += 'R'; 3703 if (QT & Decl::OBJC_TQ_Oneway) 3704 S += 'V'; 3705} 3706 3707void ASTContext::setBuiltinVaListType(QualType T) { 3708 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3709 3710 BuiltinVaListType = T; 3711} 3712 3713void ASTContext::setObjCIdType(QualType T) { 3714 ObjCIdTypedefType = T; 3715} 3716 3717void ASTContext::setObjCSelType(QualType T) { 3718 ObjCSelTypedefType = T; 3719} 3720 3721void ASTContext::setObjCProtoType(QualType QT) { 3722 ObjCProtoType = QT; 3723} 3724 3725void ASTContext::setObjCClassType(QualType T) { 3726 ObjCClassTypedefType = T; 3727} 3728 3729void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3730 assert(ObjCConstantStringType.isNull() && 3731 "'NSConstantString' type already set!"); 3732 3733 ObjCConstantStringType = getObjCInterfaceType(Decl); 3734} 3735 3736/// \brief Retrieve the template name that corresponds to a non-empty 3737/// lookup. 3738TemplateName ASTContext::getOverloadedTemplateName(NamedDecl * const *Begin, 3739 NamedDecl * const *End) { 3740 unsigned size = End - Begin; 3741 assert(size > 1 && "set is not overloaded!"); 3742 3743 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 3744 size * sizeof(FunctionTemplateDecl*)); 3745 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 3746 3747 NamedDecl **Storage = OT->getStorage(); 3748 for (NamedDecl * const *I = Begin; I != End; ++I) { 3749 NamedDecl *D = *I; 3750 assert(isa<FunctionTemplateDecl>(D) || 3751 (isa<UsingShadowDecl>(D) && 3752 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 3753 *Storage++ = D; 3754 } 3755 3756 return TemplateName(OT); 3757} 3758 3759/// \brief Retrieve the template name that represents a qualified 3760/// template name such as \c std::vector. 3761TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3762 bool TemplateKeyword, 3763 TemplateDecl *Template) { 3764 llvm::FoldingSetNodeID ID; 3765 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3766 3767 void *InsertPos = 0; 3768 QualifiedTemplateName *QTN = 3769 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3770 if (!QTN) { 3771 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3772 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3773 } 3774 3775 return TemplateName(QTN); 3776} 3777 3778/// \brief Retrieve the template name that represents a dependent 3779/// template name such as \c MetaFun::template apply. 3780TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3781 const IdentifierInfo *Name) { 3782 assert((!NNS || NNS->isDependent()) && 3783 "Nested name specifier must be dependent"); 3784 3785 llvm::FoldingSetNodeID ID; 3786 DependentTemplateName::Profile(ID, NNS, Name); 3787 3788 void *InsertPos = 0; 3789 DependentTemplateName *QTN = 3790 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3791 3792 if (QTN) 3793 return TemplateName(QTN); 3794 3795 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3796 if (CanonNNS == NNS) { 3797 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3798 } else { 3799 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3800 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3801 } 3802 3803 DependentTemplateNames.InsertNode(QTN, InsertPos); 3804 return TemplateName(QTN); 3805} 3806 3807/// \brief Retrieve the template name that represents a dependent 3808/// template name such as \c MetaFun::template operator+. 3809TemplateName 3810ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3811 OverloadedOperatorKind Operator) { 3812 assert((!NNS || NNS->isDependent()) && 3813 "Nested name specifier must be dependent"); 3814 3815 llvm::FoldingSetNodeID ID; 3816 DependentTemplateName::Profile(ID, NNS, Operator); 3817 3818 void *InsertPos = 0; 3819 DependentTemplateName *QTN = 3820 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3821 3822 if (QTN) 3823 return TemplateName(QTN); 3824 3825 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3826 if (CanonNNS == NNS) { 3827 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 3828 } else { 3829 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 3830 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 3831 } 3832 3833 DependentTemplateNames.InsertNode(QTN, InsertPos); 3834 return TemplateName(QTN); 3835} 3836 3837/// getFromTargetType - Given one of the integer types provided by 3838/// TargetInfo, produce the corresponding type. The unsigned @p Type 3839/// is actually a value of type @c TargetInfo::IntType. 3840CanQualType ASTContext::getFromTargetType(unsigned Type) const { 3841 switch (Type) { 3842 case TargetInfo::NoInt: return CanQualType(); 3843 case TargetInfo::SignedShort: return ShortTy; 3844 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3845 case TargetInfo::SignedInt: return IntTy; 3846 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3847 case TargetInfo::SignedLong: return LongTy; 3848 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3849 case TargetInfo::SignedLongLong: return LongLongTy; 3850 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3851 } 3852 3853 assert(false && "Unhandled TargetInfo::IntType value"); 3854 return CanQualType(); 3855} 3856 3857//===----------------------------------------------------------------------===// 3858// Type Predicates. 3859//===----------------------------------------------------------------------===// 3860 3861/// isObjCNSObjectType - Return true if this is an NSObject object using 3862/// NSObject attribute on a c-style pointer type. 3863/// FIXME - Make it work directly on types. 3864/// FIXME: Move to Type. 3865/// 3866bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3867 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3868 if (TypedefDecl *TD = TDT->getDecl()) 3869 if (TD->getAttr<ObjCNSObjectAttr>()) 3870 return true; 3871 } 3872 return false; 3873} 3874 3875/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3876/// garbage collection attribute. 3877/// 3878Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3879 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3880 if (getLangOptions().ObjC1 && 3881 getLangOptions().getGCMode() != LangOptions::NonGC) { 3882 GCAttrs = Ty.getObjCGCAttr(); 3883 // Default behavious under objective-c's gc is for objective-c pointers 3884 // (or pointers to them) be treated as though they were declared 3885 // as __strong. 3886 if (GCAttrs == Qualifiers::GCNone) { 3887 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3888 GCAttrs = Qualifiers::Strong; 3889 else if (Ty->isPointerType()) 3890 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3891 } 3892 // Non-pointers have none gc'able attribute regardless of the attribute 3893 // set on them. 3894 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3895 return Qualifiers::GCNone; 3896 } 3897 return GCAttrs; 3898} 3899 3900//===----------------------------------------------------------------------===// 3901// Type Compatibility Testing 3902//===----------------------------------------------------------------------===// 3903 3904/// areCompatVectorTypes - Return true if the two specified vector types are 3905/// compatible. 3906static bool areCompatVectorTypes(const VectorType *LHS, 3907 const VectorType *RHS) { 3908 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 3909 return LHS->getElementType() == RHS->getElementType() && 3910 LHS->getNumElements() == RHS->getNumElements(); 3911} 3912 3913//===----------------------------------------------------------------------===// 3914// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3915//===----------------------------------------------------------------------===// 3916 3917/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3918/// inheritance hierarchy of 'rProto'. 3919bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3920 ObjCProtocolDecl *rProto) { 3921 if (lProto == rProto) 3922 return true; 3923 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3924 E = rProto->protocol_end(); PI != E; ++PI) 3925 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3926 return true; 3927 return false; 3928} 3929 3930/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3931/// return true if lhs's protocols conform to rhs's protocol; false 3932/// otherwise. 3933bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3934 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3935 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3936 return false; 3937} 3938 3939/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3940/// ObjCQualifiedIDType. 3941bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3942 bool compare) { 3943 // Allow id<P..> and an 'id' or void* type in all cases. 3944 if (lhs->isVoidPointerType() || 3945 lhs->isObjCIdType() || lhs->isObjCClassType()) 3946 return true; 3947 else if (rhs->isVoidPointerType() || 3948 rhs->isObjCIdType() || rhs->isObjCClassType()) 3949 return true; 3950 3951 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3952 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3953 3954 if (!rhsOPT) return false; 3955 3956 if (rhsOPT->qual_empty()) { 3957 // If the RHS is a unqualified interface pointer "NSString*", 3958 // make sure we check the class hierarchy. 3959 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3960 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3961 E = lhsQID->qual_end(); I != E; ++I) { 3962 // when comparing an id<P> on lhs with a static type on rhs, 3963 // see if static class implements all of id's protocols, directly or 3964 // through its super class and categories. 3965 if (!rhsID->ClassImplementsProtocol(*I, true)) 3966 return false; 3967 } 3968 } 3969 // If there are no qualifiers and no interface, we have an 'id'. 3970 return true; 3971 } 3972 // Both the right and left sides have qualifiers. 3973 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3974 E = lhsQID->qual_end(); I != E; ++I) { 3975 ObjCProtocolDecl *lhsProto = *I; 3976 bool match = false; 3977 3978 // when comparing an id<P> on lhs with a static type on rhs, 3979 // see if static class implements all of id's protocols, directly or 3980 // through its super class and categories. 3981 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3982 E = rhsOPT->qual_end(); J != E; ++J) { 3983 ObjCProtocolDecl *rhsProto = *J; 3984 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3985 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3986 match = true; 3987 break; 3988 } 3989 } 3990 // If the RHS is a qualified interface pointer "NSString<P>*", 3991 // make sure we check the class hierarchy. 3992 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3993 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3994 E = lhsQID->qual_end(); I != E; ++I) { 3995 // when comparing an id<P> on lhs with a static type on rhs, 3996 // see if static class implements all of id's protocols, directly or 3997 // through its super class and categories. 3998 if (rhsID->ClassImplementsProtocol(*I, true)) { 3999 match = true; 4000 break; 4001 } 4002 } 4003 } 4004 if (!match) 4005 return false; 4006 } 4007 4008 return true; 4009 } 4010 4011 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 4012 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 4013 4014 if (const ObjCObjectPointerType *lhsOPT = 4015 lhs->getAsObjCInterfacePointerType()) { 4016 if (lhsOPT->qual_empty()) { 4017 bool match = false; 4018 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 4019 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 4020 E = rhsQID->qual_end(); I != E; ++I) { 4021 // when comparing an id<P> on lhs with a static type on rhs, 4022 // see if static class implements all of id's protocols, directly or 4023 // through its super class and categories. 4024 if (lhsID->ClassImplementsProtocol(*I, true)) { 4025 match = true; 4026 break; 4027 } 4028 } 4029 if (!match) 4030 return false; 4031 } 4032 return true; 4033 } 4034 // Both the right and left sides have qualifiers. 4035 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 4036 E = lhsOPT->qual_end(); I != E; ++I) { 4037 ObjCProtocolDecl *lhsProto = *I; 4038 bool match = false; 4039 4040 // when comparing an id<P> on lhs with a static type on rhs, 4041 // see if static class implements all of id's protocols, directly or 4042 // through its super class and categories. 4043 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4044 E = rhsQID->qual_end(); J != E; ++J) { 4045 ObjCProtocolDecl *rhsProto = *J; 4046 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4047 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4048 match = true; 4049 break; 4050 } 4051 } 4052 if (!match) 4053 return false; 4054 } 4055 return true; 4056 } 4057 return false; 4058} 4059 4060/// canAssignObjCInterfaces - Return true if the two interface types are 4061/// compatible for assignment from RHS to LHS. This handles validation of any 4062/// protocol qualifiers on the LHS or RHS. 4063/// 4064bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4065 const ObjCObjectPointerType *RHSOPT) { 4066 // If either type represents the built-in 'id' or 'Class' types, return true. 4067 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 4068 return true; 4069 4070 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4071 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4072 QualType(RHSOPT,0), 4073 false); 4074 4075 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4076 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4077 if (LHS && RHS) // We have 2 user-defined types. 4078 return canAssignObjCInterfaces(LHS, RHS); 4079 4080 return false; 4081} 4082 4083/// getIntersectionOfProtocols - This routine finds the intersection of set 4084/// of protocols inherited from two distinct objective-c pointer objects. 4085/// It is used to build composite qualifier list of the composite type of 4086/// the conditional expression involving two objective-c pointer objects. 4087static 4088void getIntersectionOfProtocols(ASTContext &Context, 4089 const ObjCObjectPointerType *LHSOPT, 4090 const ObjCObjectPointerType *RHSOPT, 4091 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4092 4093 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4094 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4095 4096 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4097 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4098 if (LHSNumProtocols > 0) 4099 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4100 else { 4101 llvm::SmallVector<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4102 Context.CollectInheritedProtocols(LHS->getDecl(), LHSInheritedProtocols); 4103 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4104 LHSInheritedProtocols.end()); 4105 } 4106 4107 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4108 if (RHSNumProtocols > 0) { 4109 ObjCProtocolDecl **RHSProtocols = (ObjCProtocolDecl **)RHS->qual_begin(); 4110 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4111 if (InheritedProtocolSet.count(RHSProtocols[i])) 4112 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4113 } 4114 else { 4115 llvm::SmallVector<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4116 Context.CollectInheritedProtocols(RHS->getDecl(), RHSInheritedProtocols); 4117 // FIXME. This may cause duplication of protocols in the list, but should 4118 // be harmless. 4119 for (unsigned i = 0, len = RHSInheritedProtocols.size(); i < len; ++i) 4120 if (InheritedProtocolSet.count(RHSInheritedProtocols[i])) 4121 IntersectionOfProtocols.push_back(RHSInheritedProtocols[i]); 4122 } 4123} 4124 4125/// areCommonBaseCompatible - Returns common base class of the two classes if 4126/// one found. Note that this is O'2 algorithm. But it will be called as the 4127/// last type comparison in a ?-exp of ObjC pointer types before a 4128/// warning is issued. So, its invokation is extremely rare. 4129QualType ASTContext::areCommonBaseCompatible( 4130 const ObjCObjectPointerType *LHSOPT, 4131 const ObjCObjectPointerType *RHSOPT) { 4132 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4133 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4134 if (!LHS || !RHS) 4135 return QualType(); 4136 4137 while (const ObjCInterfaceDecl *LHSIDecl = LHS->getDecl()->getSuperClass()) { 4138 QualType LHSTy = getObjCInterfaceType(LHSIDecl); 4139 LHS = LHSTy->getAs<ObjCInterfaceType>(); 4140 if (canAssignObjCInterfaces(LHS, RHS)) { 4141 llvm::SmallVector<ObjCProtocolDecl *, 8> IntersectionOfProtocols; 4142 getIntersectionOfProtocols(*this, 4143 LHSOPT, RHSOPT, IntersectionOfProtocols); 4144 if (IntersectionOfProtocols.empty()) 4145 LHSTy = getObjCObjectPointerType(LHSTy); 4146 else 4147 LHSTy = getObjCObjectPointerType(LHSTy, &IntersectionOfProtocols[0], 4148 IntersectionOfProtocols.size()); 4149 return LHSTy; 4150 } 4151 } 4152 4153 return QualType(); 4154} 4155 4156bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 4157 const ObjCInterfaceType *RHS) { 4158 // Verify that the base decls are compatible: the RHS must be a subclass of 4159 // the LHS. 4160 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4161 return false; 4162 4163 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4164 // protocol qualified at all, then we are good. 4165 if (LHS->getNumProtocols() == 0) 4166 return true; 4167 4168 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4169 // isn't a superset. 4170 if (RHS->getNumProtocols() == 0) 4171 return true; // FIXME: should return false! 4172 4173 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 4174 LHSPE = LHS->qual_end(); 4175 LHSPI != LHSPE; LHSPI++) { 4176 bool RHSImplementsProtocol = false; 4177 4178 // If the RHS doesn't implement the protocol on the left, the types 4179 // are incompatible. 4180 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 4181 RHSPE = RHS->qual_end(); 4182 RHSPI != RHSPE; RHSPI++) { 4183 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4184 RHSImplementsProtocol = true; 4185 break; 4186 } 4187 } 4188 // FIXME: For better diagnostics, consider passing back the protocol name. 4189 if (!RHSImplementsProtocol) 4190 return false; 4191 } 4192 // The RHS implements all protocols listed on the LHS. 4193 return true; 4194} 4195 4196bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4197 // get the "pointed to" types 4198 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4199 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4200 4201 if (!LHSOPT || !RHSOPT) 4202 return false; 4203 4204 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4205 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4206} 4207 4208/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4209/// both shall have the identically qualified version of a compatible type. 4210/// C99 6.2.7p1: Two types have compatible types if their types are the 4211/// same. See 6.7.[2,3,5] for additional rules. 4212bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 4213 return !mergeTypes(LHS, RHS).isNull(); 4214} 4215 4216QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 4217 const FunctionType *lbase = lhs->getAs<FunctionType>(); 4218 const FunctionType *rbase = rhs->getAs<FunctionType>(); 4219 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 4220 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 4221 bool allLTypes = true; 4222 bool allRTypes = true; 4223 4224 // Check return type 4225 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 4226 if (retType.isNull()) return QualType(); 4227 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 4228 allLTypes = false; 4229 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 4230 allRTypes = false; 4231 // FIXME: double check this 4232 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 4233 if (NoReturn != lbase->getNoReturnAttr()) 4234 allLTypes = false; 4235 if (NoReturn != rbase->getNoReturnAttr()) 4236 allRTypes = false; 4237 4238 if (lproto && rproto) { // two C99 style function prototypes 4239 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 4240 "C++ shouldn't be here"); 4241 unsigned lproto_nargs = lproto->getNumArgs(); 4242 unsigned rproto_nargs = rproto->getNumArgs(); 4243 4244 // Compatible functions must have the same number of arguments 4245 if (lproto_nargs != rproto_nargs) 4246 return QualType(); 4247 4248 // Variadic and non-variadic functions aren't compatible 4249 if (lproto->isVariadic() != rproto->isVariadic()) 4250 return QualType(); 4251 4252 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 4253 return QualType(); 4254 4255 // Check argument compatibility 4256 llvm::SmallVector<QualType, 10> types; 4257 for (unsigned i = 0; i < lproto_nargs; i++) { 4258 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 4259 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 4260 QualType argtype = mergeTypes(largtype, rargtype); 4261 if (argtype.isNull()) return QualType(); 4262 types.push_back(argtype); 4263 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 4264 allLTypes = false; 4265 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 4266 allRTypes = false; 4267 } 4268 if (allLTypes) return lhs; 4269 if (allRTypes) return rhs; 4270 return getFunctionType(retType, types.begin(), types.size(), 4271 lproto->isVariadic(), lproto->getTypeQuals(), 4272 NoReturn); 4273 } 4274 4275 if (lproto) allRTypes = false; 4276 if (rproto) allLTypes = false; 4277 4278 const FunctionProtoType *proto = lproto ? lproto : rproto; 4279 if (proto) { 4280 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 4281 if (proto->isVariadic()) return QualType(); 4282 // Check that the types are compatible with the types that 4283 // would result from default argument promotions (C99 6.7.5.3p15). 4284 // The only types actually affected are promotable integer 4285 // types and floats, which would be passed as a different 4286 // type depending on whether the prototype is visible. 4287 unsigned proto_nargs = proto->getNumArgs(); 4288 for (unsigned i = 0; i < proto_nargs; ++i) { 4289 QualType argTy = proto->getArgType(i); 4290 if (argTy->isPromotableIntegerType() || 4291 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 4292 return QualType(); 4293 } 4294 4295 if (allLTypes) return lhs; 4296 if (allRTypes) return rhs; 4297 return getFunctionType(retType, proto->arg_type_begin(), 4298 proto->getNumArgs(), proto->isVariadic(), 4299 proto->getTypeQuals(), NoReturn); 4300 } 4301 4302 if (allLTypes) return lhs; 4303 if (allRTypes) return rhs; 4304 return getFunctionNoProtoType(retType, NoReturn); 4305} 4306 4307QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 4308 // C++ [expr]: If an expression initially has the type "reference to T", the 4309 // type is adjusted to "T" prior to any further analysis, the expression 4310 // designates the object or function denoted by the reference, and the 4311 // expression is an lvalue unless the reference is an rvalue reference and 4312 // the expression is a function call (possibly inside parentheses). 4313 // FIXME: C++ shouldn't be going through here! The rules are different 4314 // enough that they should be handled separately. 4315 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 4316 // shouldn't be going through here! 4317 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 4318 LHS = RT->getPointeeType(); 4319 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 4320 RHS = RT->getPointeeType(); 4321 4322 QualType LHSCan = getCanonicalType(LHS), 4323 RHSCan = getCanonicalType(RHS); 4324 4325 // If two types are identical, they are compatible. 4326 if (LHSCan == RHSCan) 4327 return LHS; 4328 4329 // If the qualifiers are different, the types aren't compatible... mostly. 4330 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 4331 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 4332 if (LQuals != RQuals) { 4333 // If any of these qualifiers are different, we have a type 4334 // mismatch. 4335 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 4336 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 4337 return QualType(); 4338 4339 // Exactly one GC qualifier difference is allowed: __strong is 4340 // okay if the other type has no GC qualifier but is an Objective 4341 // C object pointer (i.e. implicitly strong by default). We fix 4342 // this by pretending that the unqualified type was actually 4343 // qualified __strong. 4344 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 4345 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 4346 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 4347 4348 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 4349 return QualType(); 4350 4351 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 4352 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 4353 } 4354 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 4355 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 4356 } 4357 return QualType(); 4358 } 4359 4360 // Okay, qualifiers are equal. 4361 4362 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 4363 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 4364 4365 // We want to consider the two function types to be the same for these 4366 // comparisons, just force one to the other. 4367 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 4368 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 4369 4370 // Same as above for arrays 4371 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 4372 LHSClass = Type::ConstantArray; 4373 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 4374 RHSClass = Type::ConstantArray; 4375 4376 // Canonicalize ExtVector -> Vector. 4377 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 4378 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 4379 4380 // If the canonical type classes don't match. 4381 if (LHSClass != RHSClass) { 4382 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 4383 // a signed integer type, or an unsigned integer type. 4384 // Compatibility is based on the underlying type, not the promotion 4385 // type. 4386 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 4387 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 4388 return RHS; 4389 } 4390 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 4391 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 4392 return LHS; 4393 } 4394 4395 return QualType(); 4396 } 4397 4398 // The canonical type classes match. 4399 switch (LHSClass) { 4400#define TYPE(Class, Base) 4401#define ABSTRACT_TYPE(Class, Base) 4402#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4403#define DEPENDENT_TYPE(Class, Base) case Type::Class: 4404#include "clang/AST/TypeNodes.def" 4405 assert(false && "Non-canonical and dependent types shouldn't get here"); 4406 return QualType(); 4407 4408 case Type::LValueReference: 4409 case Type::RValueReference: 4410 case Type::MemberPointer: 4411 assert(false && "C++ should never be in mergeTypes"); 4412 return QualType(); 4413 4414 case Type::IncompleteArray: 4415 case Type::VariableArray: 4416 case Type::FunctionProto: 4417 case Type::ExtVector: 4418 assert(false && "Types are eliminated above"); 4419 return QualType(); 4420 4421 case Type::Pointer: 4422 { 4423 // Merge two pointer types, while trying to preserve typedef info 4424 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 4425 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 4426 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4427 if (ResultType.isNull()) return QualType(); 4428 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4429 return LHS; 4430 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4431 return RHS; 4432 return getPointerType(ResultType); 4433 } 4434 case Type::BlockPointer: 4435 { 4436 // Merge two block pointer types, while trying to preserve typedef info 4437 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 4438 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 4439 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4440 if (ResultType.isNull()) return QualType(); 4441 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4442 return LHS; 4443 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4444 return RHS; 4445 return getBlockPointerType(ResultType); 4446 } 4447 case Type::ConstantArray: 4448 { 4449 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 4450 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 4451 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 4452 return QualType(); 4453 4454 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 4455 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 4456 QualType ResultType = mergeTypes(LHSElem, RHSElem); 4457 if (ResultType.isNull()) return QualType(); 4458 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4459 return LHS; 4460 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4461 return RHS; 4462 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 4463 ArrayType::ArraySizeModifier(), 0); 4464 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 4465 ArrayType::ArraySizeModifier(), 0); 4466 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 4467 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 4468 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4469 return LHS; 4470 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4471 return RHS; 4472 if (LVAT) { 4473 // FIXME: This isn't correct! But tricky to implement because 4474 // the array's size has to be the size of LHS, but the type 4475 // has to be different. 4476 return LHS; 4477 } 4478 if (RVAT) { 4479 // FIXME: This isn't correct! But tricky to implement because 4480 // the array's size has to be the size of RHS, but the type 4481 // has to be different. 4482 return RHS; 4483 } 4484 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4485 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4486 return getIncompleteArrayType(ResultType, 4487 ArrayType::ArraySizeModifier(), 0); 4488 } 4489 case Type::FunctionNoProto: 4490 return mergeFunctionTypes(LHS, RHS); 4491 case Type::Record: 4492 case Type::Enum: 4493 return QualType(); 4494 case Type::Builtin: 4495 // Only exactly equal builtin types are compatible, which is tested above. 4496 return QualType(); 4497 case Type::Complex: 4498 // Distinct complex types are incompatible. 4499 return QualType(); 4500 case Type::Vector: 4501 // FIXME: The merged type should be an ExtVector! 4502 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 4503 return LHS; 4504 return QualType(); 4505 case Type::ObjCInterface: { 4506 // Check if the interfaces are assignment compatible. 4507 // FIXME: This should be type compatibility, e.g. whether 4508 // "LHS x; RHS x;" at global scope is legal. 4509 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 4510 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 4511 if (LHSIface && RHSIface && 4512 canAssignObjCInterfaces(LHSIface, RHSIface)) 4513 return LHS; 4514 4515 return QualType(); 4516 } 4517 case Type::ObjCObjectPointer: { 4518 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4519 RHS->getAs<ObjCObjectPointerType>())) 4520 return LHS; 4521 4522 return QualType(); 4523 } 4524 case Type::TemplateSpecialization: 4525 assert(false && "Dependent types have no size"); 4526 break; 4527 } 4528 4529 return QualType(); 4530} 4531 4532//===----------------------------------------------------------------------===// 4533// Integer Predicates 4534//===----------------------------------------------------------------------===// 4535 4536unsigned ASTContext::getIntWidth(QualType T) { 4537 if (T->isBooleanType()) 4538 return 1; 4539 if (EnumType *ET = dyn_cast<EnumType>(T)) 4540 T = ET->getDecl()->getIntegerType(); 4541 // For builtin types, just use the standard type sizing method 4542 return (unsigned)getTypeSize(T); 4543} 4544 4545QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4546 assert(T->isSignedIntegerType() && "Unexpected type"); 4547 4548 // Turn <4 x signed int> -> <4 x unsigned int> 4549 if (const VectorType *VTy = T->getAs<VectorType>()) 4550 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4551 VTy->getNumElements()); 4552 4553 // For enums, we return the unsigned version of the base type. 4554 if (const EnumType *ETy = T->getAs<EnumType>()) 4555 T = ETy->getDecl()->getIntegerType(); 4556 4557 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4558 assert(BTy && "Unexpected signed integer type"); 4559 switch (BTy->getKind()) { 4560 case BuiltinType::Char_S: 4561 case BuiltinType::SChar: 4562 return UnsignedCharTy; 4563 case BuiltinType::Short: 4564 return UnsignedShortTy; 4565 case BuiltinType::Int: 4566 return UnsignedIntTy; 4567 case BuiltinType::Long: 4568 return UnsignedLongTy; 4569 case BuiltinType::LongLong: 4570 return UnsignedLongLongTy; 4571 case BuiltinType::Int128: 4572 return UnsignedInt128Ty; 4573 default: 4574 assert(0 && "Unexpected signed integer type"); 4575 return QualType(); 4576 } 4577} 4578 4579ExternalASTSource::~ExternalASTSource() { } 4580 4581void ExternalASTSource::PrintStats() { } 4582 4583 4584//===----------------------------------------------------------------------===// 4585// Builtin Type Computation 4586//===----------------------------------------------------------------------===// 4587 4588/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4589/// pointer over the consumed characters. This returns the resultant type. 4590static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4591 ASTContext::GetBuiltinTypeError &Error, 4592 bool AllowTypeModifiers = true) { 4593 // Modifiers. 4594 int HowLong = 0; 4595 bool Signed = false, Unsigned = false; 4596 4597 // Read the modifiers first. 4598 bool Done = false; 4599 while (!Done) { 4600 switch (*Str++) { 4601 default: Done = true; --Str; break; 4602 case 'S': 4603 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4604 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4605 Signed = true; 4606 break; 4607 case 'U': 4608 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4609 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4610 Unsigned = true; 4611 break; 4612 case 'L': 4613 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4614 ++HowLong; 4615 break; 4616 } 4617 } 4618 4619 QualType Type; 4620 4621 // Read the base type. 4622 switch (*Str++) { 4623 default: assert(0 && "Unknown builtin type letter!"); 4624 case 'v': 4625 assert(HowLong == 0 && !Signed && !Unsigned && 4626 "Bad modifiers used with 'v'!"); 4627 Type = Context.VoidTy; 4628 break; 4629 case 'f': 4630 assert(HowLong == 0 && !Signed && !Unsigned && 4631 "Bad modifiers used with 'f'!"); 4632 Type = Context.FloatTy; 4633 break; 4634 case 'd': 4635 assert(HowLong < 2 && !Signed && !Unsigned && 4636 "Bad modifiers used with 'd'!"); 4637 if (HowLong) 4638 Type = Context.LongDoubleTy; 4639 else 4640 Type = Context.DoubleTy; 4641 break; 4642 case 's': 4643 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4644 if (Unsigned) 4645 Type = Context.UnsignedShortTy; 4646 else 4647 Type = Context.ShortTy; 4648 break; 4649 case 'i': 4650 if (HowLong == 3) 4651 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4652 else if (HowLong == 2) 4653 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4654 else if (HowLong == 1) 4655 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4656 else 4657 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4658 break; 4659 case 'c': 4660 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4661 if (Signed) 4662 Type = Context.SignedCharTy; 4663 else if (Unsigned) 4664 Type = Context.UnsignedCharTy; 4665 else 4666 Type = Context.CharTy; 4667 break; 4668 case 'b': // boolean 4669 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4670 Type = Context.BoolTy; 4671 break; 4672 case 'z': // size_t. 4673 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4674 Type = Context.getSizeType(); 4675 break; 4676 case 'F': 4677 Type = Context.getCFConstantStringType(); 4678 break; 4679 case 'a': 4680 Type = Context.getBuiltinVaListType(); 4681 assert(!Type.isNull() && "builtin va list type not initialized!"); 4682 break; 4683 case 'A': 4684 // This is a "reference" to a va_list; however, what exactly 4685 // this means depends on how va_list is defined. There are two 4686 // different kinds of va_list: ones passed by value, and ones 4687 // passed by reference. An example of a by-value va_list is 4688 // x86, where va_list is a char*. An example of by-ref va_list 4689 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4690 // we want this argument to be a char*&; for x86-64, we want 4691 // it to be a __va_list_tag*. 4692 Type = Context.getBuiltinVaListType(); 4693 assert(!Type.isNull() && "builtin va list type not initialized!"); 4694 if (Type->isArrayType()) { 4695 Type = Context.getArrayDecayedType(Type); 4696 } else { 4697 Type = Context.getLValueReferenceType(Type); 4698 } 4699 break; 4700 case 'V': { 4701 char *End; 4702 unsigned NumElements = strtoul(Str, &End, 10); 4703 assert(End != Str && "Missing vector size"); 4704 4705 Str = End; 4706 4707 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4708 Type = Context.getVectorType(ElementType, NumElements); 4709 break; 4710 } 4711 case 'X': { 4712 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4713 Type = Context.getComplexType(ElementType); 4714 break; 4715 } 4716 case 'P': 4717 Type = Context.getFILEType(); 4718 if (Type.isNull()) { 4719 Error = ASTContext::GE_Missing_stdio; 4720 return QualType(); 4721 } 4722 break; 4723 case 'J': 4724 if (Signed) 4725 Type = Context.getsigjmp_bufType(); 4726 else 4727 Type = Context.getjmp_bufType(); 4728 4729 if (Type.isNull()) { 4730 Error = ASTContext::GE_Missing_setjmp; 4731 return QualType(); 4732 } 4733 break; 4734 } 4735 4736 if (!AllowTypeModifiers) 4737 return Type; 4738 4739 Done = false; 4740 while (!Done) { 4741 switch (*Str++) { 4742 default: Done = true; --Str; break; 4743 case '*': 4744 Type = Context.getPointerType(Type); 4745 break; 4746 case '&': 4747 Type = Context.getLValueReferenceType(Type); 4748 break; 4749 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4750 case 'C': 4751 Type = Type.withConst(); 4752 break; 4753 } 4754 } 4755 4756 return Type; 4757} 4758 4759/// GetBuiltinType - Return the type for the specified builtin. 4760QualType ASTContext::GetBuiltinType(unsigned id, 4761 GetBuiltinTypeError &Error) { 4762 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4763 4764 llvm::SmallVector<QualType, 8> ArgTypes; 4765 4766 Error = GE_None; 4767 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4768 if (Error != GE_None) 4769 return QualType(); 4770 while (TypeStr[0] && TypeStr[0] != '.') { 4771 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4772 if (Error != GE_None) 4773 return QualType(); 4774 4775 // Do array -> pointer decay. The builtin should use the decayed type. 4776 if (Ty->isArrayType()) 4777 Ty = getArrayDecayedType(Ty); 4778 4779 ArgTypes.push_back(Ty); 4780 } 4781 4782 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4783 "'.' should only occur at end of builtin type list!"); 4784 4785 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4786 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4787 return getFunctionNoProtoType(ResType); 4788 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4789 TypeStr[0] == '.', 0); 4790} 4791 4792QualType 4793ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4794 // Perform the usual unary conversions. We do this early so that 4795 // integral promotions to "int" can allow us to exit early, in the 4796 // lhs == rhs check. Also, for conversion purposes, we ignore any 4797 // qualifiers. For example, "const float" and "float" are 4798 // equivalent. 4799 if (lhs->isPromotableIntegerType()) 4800 lhs = getPromotedIntegerType(lhs); 4801 else 4802 lhs = lhs.getUnqualifiedType(); 4803 if (rhs->isPromotableIntegerType()) 4804 rhs = getPromotedIntegerType(rhs); 4805 else 4806 rhs = rhs.getUnqualifiedType(); 4807 4808 // If both types are identical, no conversion is needed. 4809 if (lhs == rhs) 4810 return lhs; 4811 4812 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4813 // The caller can deal with this (e.g. pointer + int). 4814 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4815 return lhs; 4816 4817 // At this point, we have two different arithmetic types. 4818 4819 // Handle complex types first (C99 6.3.1.8p1). 4820 if (lhs->isComplexType() || rhs->isComplexType()) { 4821 // if we have an integer operand, the result is the complex type. 4822 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4823 // convert the rhs to the lhs complex type. 4824 return lhs; 4825 } 4826 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4827 // convert the lhs to the rhs complex type. 4828 return rhs; 4829 } 4830 // This handles complex/complex, complex/float, or float/complex. 4831 // When both operands are complex, the shorter operand is converted to the 4832 // type of the longer, and that is the type of the result. This corresponds 4833 // to what is done when combining two real floating-point operands. 4834 // The fun begins when size promotion occur across type domains. 4835 // From H&S 6.3.4: When one operand is complex and the other is a real 4836 // floating-point type, the less precise type is converted, within it's 4837 // real or complex domain, to the precision of the other type. For example, 4838 // when combining a "long double" with a "double _Complex", the 4839 // "double _Complex" is promoted to "long double _Complex". 4840 int result = getFloatingTypeOrder(lhs, rhs); 4841 4842 if (result > 0) { // The left side is bigger, convert rhs. 4843 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4844 } else if (result < 0) { // The right side is bigger, convert lhs. 4845 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4846 } 4847 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4848 // domains match. This is a requirement for our implementation, C99 4849 // does not require this promotion. 4850 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4851 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4852 return rhs; 4853 } else { // handle "_Complex double, double". 4854 return lhs; 4855 } 4856 } 4857 return lhs; // The domain/size match exactly. 4858 } 4859 // Now handle "real" floating types (i.e. float, double, long double). 4860 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4861 // if we have an integer operand, the result is the real floating type. 4862 if (rhs->isIntegerType()) { 4863 // convert rhs to the lhs floating point type. 4864 return lhs; 4865 } 4866 if (rhs->isComplexIntegerType()) { 4867 // convert rhs to the complex floating point type. 4868 return getComplexType(lhs); 4869 } 4870 if (lhs->isIntegerType()) { 4871 // convert lhs to the rhs floating point type. 4872 return rhs; 4873 } 4874 if (lhs->isComplexIntegerType()) { 4875 // convert lhs to the complex floating point type. 4876 return getComplexType(rhs); 4877 } 4878 // We have two real floating types, float/complex combos were handled above. 4879 // Convert the smaller operand to the bigger result. 4880 int result = getFloatingTypeOrder(lhs, rhs); 4881 if (result > 0) // convert the rhs 4882 return lhs; 4883 assert(result < 0 && "illegal float comparison"); 4884 return rhs; // convert the lhs 4885 } 4886 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4887 // Handle GCC complex int extension. 4888 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4889 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4890 4891 if (lhsComplexInt && rhsComplexInt) { 4892 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4893 rhsComplexInt->getElementType()) >= 0) 4894 return lhs; // convert the rhs 4895 return rhs; 4896 } else if (lhsComplexInt && rhs->isIntegerType()) { 4897 // convert the rhs to the lhs complex type. 4898 return lhs; 4899 } else if (rhsComplexInt && lhs->isIntegerType()) { 4900 // convert the lhs to the rhs complex type. 4901 return rhs; 4902 } 4903 } 4904 // Finally, we have two differing integer types. 4905 // The rules for this case are in C99 6.3.1.8 4906 int compare = getIntegerTypeOrder(lhs, rhs); 4907 bool lhsSigned = lhs->isSignedIntegerType(), 4908 rhsSigned = rhs->isSignedIntegerType(); 4909 QualType destType; 4910 if (lhsSigned == rhsSigned) { 4911 // Same signedness; use the higher-ranked type 4912 destType = compare >= 0 ? lhs : rhs; 4913 } else if (compare != (lhsSigned ? 1 : -1)) { 4914 // The unsigned type has greater than or equal rank to the 4915 // signed type, so use the unsigned type 4916 destType = lhsSigned ? rhs : lhs; 4917 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4918 // The two types are different widths; if we are here, that 4919 // means the signed type is larger than the unsigned type, so 4920 // use the signed type. 4921 destType = lhsSigned ? lhs : rhs; 4922 } else { 4923 // The signed type is higher-ranked than the unsigned type, 4924 // but isn't actually any bigger (like unsigned int and long 4925 // on most 32-bit systems). Use the unsigned type corresponding 4926 // to the signed type. 4927 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4928 } 4929 return destType; 4930} 4931