ASTContext.cpp revision 2ec09f1dc123e1942ed756e8ee4fef86451eac9e
1//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclCXX.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/Expr.h" 19#include "clang/AST/ExternalASTSource.h" 20#include "clang/AST/RecordLayout.h" 21#include "clang/Basic/Builtins.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "llvm/ADT/StringExtras.h" 25#include "llvm/Support/MathExtras.h" 26#include "llvm/Support/MemoryBuffer.h" 27#include "RecordLayoutBuilder.h" 28 29using namespace clang; 30 31enum FloatingRank { 32 FloatRank, DoubleRank, LongDoubleRank 33}; 34 35ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 36 TargetInfo &t, 37 IdentifierTable &idents, SelectorTable &sels, 38 Builtin::Context &builtins, 39 bool FreeMem, unsigned size_reserve) : 40 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 41 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 42 sigjmp_bufDecl(0), SourceMgr(SM), LangOpts(LOpts), 43 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 44 Idents(idents), Selectors(sels), 45 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 46 if (size_reserve > 0) Types.reserve(size_reserve); 47 TUDecl = TranslationUnitDecl::Create(*this); 48 InitBuiltinTypes(); 49} 50 51ASTContext::~ASTContext() { 52 // Deallocate all the types. 53 while (!Types.empty()) { 54 Types.back()->Destroy(*this); 55 Types.pop_back(); 56 } 57 58 { 59 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 60 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 61 while (I != E) { 62 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 63 delete R; 64 } 65 } 66 67 { 68 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 69 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 70 while (I != E) { 71 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 72 delete R; 73 } 74 } 75 76 // Destroy nested-name-specifiers. 77 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 78 NNS = NestedNameSpecifiers.begin(), 79 NNSEnd = NestedNameSpecifiers.end(); 80 NNS != NNSEnd; 81 /* Increment in loop */) 82 (*NNS++).Destroy(*this); 83 84 if (GlobalNestedNameSpecifier) 85 GlobalNestedNameSpecifier->Destroy(*this); 86 87 TUDecl->Destroy(*this); 88} 89 90void 91ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 92 ExternalSource.reset(Source.take()); 93} 94 95void ASTContext::PrintStats() const { 96 fprintf(stderr, "*** AST Context Stats:\n"); 97 fprintf(stderr, " %d types total.\n", (int)Types.size()); 98 99 unsigned counts[] = { 100#define TYPE(Name, Parent) 0, 101#define ABSTRACT_TYPE(Name, Parent) 102#include "clang/AST/TypeNodes.def" 103 0 // Extra 104 }; 105 106 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 107 Type *T = Types[i]; 108 counts[(unsigned)T->getTypeClass()]++; 109 } 110 111 unsigned Idx = 0; 112 unsigned TotalBytes = 0; 113#define TYPE(Name, Parent) \ 114 if (counts[Idx]) \ 115 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 116 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 117 ++Idx; 118#define ABSTRACT_TYPE(Name, Parent) 119#include "clang/AST/TypeNodes.def" 120 121 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 122 123 if (ExternalSource.get()) { 124 fprintf(stderr, "\n"); 125 ExternalSource->PrintStats(); 126 } 127} 128 129 130void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 131 Types.push_back((R = QualType(new (*this,8) BuiltinType(K),0)).getTypePtr()); 132} 133 134void ASTContext::InitBuiltinTypes() { 135 assert(VoidTy.isNull() && "Context reinitialized?"); 136 137 // C99 6.2.5p19. 138 InitBuiltinType(VoidTy, BuiltinType::Void); 139 140 // C99 6.2.5p2. 141 InitBuiltinType(BoolTy, BuiltinType::Bool); 142 // C99 6.2.5p3. 143 if (LangOpts.CharIsSigned) 144 InitBuiltinType(CharTy, BuiltinType::Char_S); 145 else 146 InitBuiltinType(CharTy, BuiltinType::Char_U); 147 // C99 6.2.5p4. 148 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 149 InitBuiltinType(ShortTy, BuiltinType::Short); 150 InitBuiltinType(IntTy, BuiltinType::Int); 151 InitBuiltinType(LongTy, BuiltinType::Long); 152 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 153 154 // C99 6.2.5p6. 155 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 156 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 157 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 158 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 159 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 160 161 // C99 6.2.5p10. 162 InitBuiltinType(FloatTy, BuiltinType::Float); 163 InitBuiltinType(DoubleTy, BuiltinType::Double); 164 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 165 166 // GNU extension, 128-bit integers. 167 InitBuiltinType(Int128Ty, BuiltinType::Int128); 168 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 169 170 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 171 InitBuiltinType(WCharTy, BuiltinType::WChar); 172 else // C99 173 WCharTy = getFromTargetType(Target.getWCharType()); 174 175 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 176 InitBuiltinType(Char16Ty, BuiltinType::Char16); 177 else // C99 178 Char16Ty = getFromTargetType(Target.getChar16Type()); 179 180 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 181 InitBuiltinType(Char32Ty, BuiltinType::Char32); 182 else // C99 183 Char32Ty = getFromTargetType(Target.getChar32Type()); 184 185 // Placeholder type for functions. 186 InitBuiltinType(OverloadTy, BuiltinType::Overload); 187 188 // Placeholder type for type-dependent expressions whose type is 189 // completely unknown. No code should ever check a type against 190 // DependentTy and users should never see it; however, it is here to 191 // help diagnose failures to properly check for type-dependent 192 // expressions. 193 InitBuiltinType(DependentTy, BuiltinType::Dependent); 194 195 // Placeholder type for C++0x auto declarations whose real type has 196 // not yet been deduced. 197 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 198 199 // C99 6.2.5p11. 200 FloatComplexTy = getComplexType(FloatTy); 201 DoubleComplexTy = getComplexType(DoubleTy); 202 LongDoubleComplexTy = getComplexType(LongDoubleTy); 203 204 BuiltinVaListType = QualType(); 205 206 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 207 ObjCIdTypedefType = QualType(); 208 ObjCClassTypedefType = QualType(); 209 210 // Builtin types for 'id' and 'Class'. 211 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 212 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 213 214 ObjCConstantStringType = QualType(); 215 216 // void * type 217 VoidPtrTy = getPointerType(VoidTy); 218 219 // nullptr type (C++0x 2.14.7) 220 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 221} 222 223VarDecl *ASTContext::getInstantiatedFromStaticDataMember(VarDecl *Var) { 224 assert(Var->isStaticDataMember() && "Not a static data member"); 225 llvm::DenseMap<VarDecl *, VarDecl *>::iterator Pos 226 = InstantiatedFromStaticDataMember.find(Var); 227 if (Pos == InstantiatedFromStaticDataMember.end()) 228 return 0; 229 230 return Pos->second; 231} 232 233void 234ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl) { 235 assert(Inst->isStaticDataMember() && "Not a static data member"); 236 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 237 assert(!InstantiatedFromStaticDataMember[Inst] && 238 "Already noted what static data member was instantiated from"); 239 InstantiatedFromStaticDataMember[Inst] = Tmpl; 240} 241 242namespace { 243 class BeforeInTranslationUnit 244 : std::binary_function<SourceRange, SourceRange, bool> { 245 SourceManager *SourceMgr; 246 247 public: 248 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 249 250 bool operator()(SourceRange X, SourceRange Y) { 251 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 252 } 253 }; 254} 255 256/// \brief Determine whether the given comment is a Doxygen-style comment. 257/// 258/// \param Start the start of the comment text. 259/// 260/// \param End the end of the comment text. 261/// 262/// \param Member whether we want to check whether this is a member comment 263/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 264/// we only return true when we find a non-member comment. 265static bool 266isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 267 bool Member = false) { 268 const char *BufferStart 269 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 270 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 271 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 272 273 if (End - Start < 4) 274 return false; 275 276 assert(Start[0] == '/' && "Not a comment?"); 277 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 278 return false; 279 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 280 return false; 281 282 return (Start[3] == '<') == Member; 283} 284 285/// \brief Retrieve the comment associated with the given declaration, if 286/// it has one. 287const char *ASTContext::getCommentForDecl(const Decl *D) { 288 if (!D) 289 return 0; 290 291 // Check whether we have cached a comment string for this declaration 292 // already. 293 llvm::DenseMap<const Decl *, std::string>::iterator Pos 294 = DeclComments.find(D); 295 if (Pos != DeclComments.end()) 296 return Pos->second.c_str(); 297 298 // If we have an external AST source and have not yet loaded comments from 299 // that source, do so now. 300 if (ExternalSource && !LoadedExternalComments) { 301 std::vector<SourceRange> LoadedComments; 302 ExternalSource->ReadComments(LoadedComments); 303 304 if (!LoadedComments.empty()) 305 Comments.insert(Comments.begin(), LoadedComments.begin(), 306 LoadedComments.end()); 307 308 LoadedExternalComments = true; 309 } 310 311 // If there are no comments anywhere, we won't find anything. 312 if (Comments.empty()) 313 return 0; 314 315 // If the declaration doesn't map directly to a location in a file, we 316 // can't find the comment. 317 SourceLocation DeclStartLoc = D->getLocStart(); 318 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 319 return 0; 320 321 // Find the comment that occurs just before this declaration. 322 std::vector<SourceRange>::iterator LastComment 323 = std::lower_bound(Comments.begin(), Comments.end(), 324 SourceRange(DeclStartLoc), 325 BeforeInTranslationUnit(&SourceMgr)); 326 327 // Decompose the location for the start of the declaration and find the 328 // beginning of the file buffer. 329 std::pair<FileID, unsigned> DeclStartDecomp 330 = SourceMgr.getDecomposedLoc(DeclStartLoc); 331 const char *FileBufferStart 332 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 333 334 // First check whether we have a comment for a member. 335 if (LastComment != Comments.end() && 336 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 337 isDoxygenComment(SourceMgr, *LastComment, true)) { 338 std::pair<FileID, unsigned> LastCommentEndDecomp 339 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 340 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 341 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 342 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 343 LastCommentEndDecomp.second)) { 344 // The Doxygen member comment comes after the declaration starts and 345 // is on the same line and in the same file as the declaration. This 346 // is the comment we want. 347 std::string &Result = DeclComments[D]; 348 Result.append(FileBufferStart + 349 SourceMgr.getFileOffset(LastComment->getBegin()), 350 FileBufferStart + LastCommentEndDecomp.second + 1); 351 return Result.c_str(); 352 } 353 } 354 355 if (LastComment == Comments.begin()) 356 return 0; 357 --LastComment; 358 359 // Decompose the end of the comment. 360 std::pair<FileID, unsigned> LastCommentEndDecomp 361 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 362 363 // If the comment and the declaration aren't in the same file, then they 364 // aren't related. 365 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 366 return 0; 367 368 // Check that we actually have a Doxygen comment. 369 if (!isDoxygenComment(SourceMgr, *LastComment)) 370 return 0; 371 372 // Compute the starting line for the declaration and for the end of the 373 // comment (this is expensive). 374 unsigned DeclStartLine 375 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 376 unsigned CommentEndLine 377 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 378 LastCommentEndDecomp.second); 379 380 // If the comment does not end on the line prior to the declaration, then 381 // the comment is not associated with the declaration at all. 382 if (CommentEndLine + 1 != DeclStartLine) 383 return 0; 384 385 // We have a comment, but there may be more comments on the previous lines. 386 // Keep looking so long as the comments are still Doxygen comments and are 387 // still adjacent. 388 unsigned ExpectedLine 389 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 390 std::vector<SourceRange>::iterator FirstComment = LastComment; 391 while (FirstComment != Comments.begin()) { 392 // Look at the previous comment 393 --FirstComment; 394 std::pair<FileID, unsigned> Decomp 395 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 396 397 // If this previous comment is in a different file, we're done. 398 if (Decomp.first != DeclStartDecomp.first) { 399 ++FirstComment; 400 break; 401 } 402 403 // If this comment is not a Doxygen comment, we're done. 404 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 405 ++FirstComment; 406 break; 407 } 408 409 // If the line number is not what we expected, we're done. 410 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 411 if (Line != ExpectedLine) { 412 ++FirstComment; 413 break; 414 } 415 416 // Set the next expected line number. 417 ExpectedLine 418 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 419 } 420 421 // The iterator range [FirstComment, LastComment] contains all of the 422 // BCPL comments that, together, are associated with this declaration. 423 // Form a single comment block string for this declaration that concatenates 424 // all of these comments. 425 std::string &Result = DeclComments[D]; 426 while (FirstComment != LastComment) { 427 std::pair<FileID, unsigned> DecompStart 428 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 429 std::pair<FileID, unsigned> DecompEnd 430 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 431 Result.append(FileBufferStart + DecompStart.second, 432 FileBufferStart + DecompEnd.second + 1); 433 ++FirstComment; 434 } 435 436 // Append the last comment line. 437 Result.append(FileBufferStart + 438 SourceMgr.getFileOffset(LastComment->getBegin()), 439 FileBufferStart + LastCommentEndDecomp.second + 1); 440 return Result.c_str(); 441} 442 443//===----------------------------------------------------------------------===// 444// Type Sizing and Analysis 445//===----------------------------------------------------------------------===// 446 447/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 448/// scalar floating point type. 449const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 450 const BuiltinType *BT = T->getAsBuiltinType(); 451 assert(BT && "Not a floating point type!"); 452 switch (BT->getKind()) { 453 default: assert(0 && "Not a floating point type!"); 454 case BuiltinType::Float: return Target.getFloatFormat(); 455 case BuiltinType::Double: return Target.getDoubleFormat(); 456 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 457 } 458} 459 460/// getDeclAlign - Return a conservative estimate of the alignment of the 461/// specified decl. Note that bitfields do not have a valid alignment, so 462/// this method will assert on them. 463unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 464 unsigned Align = Target.getCharWidth(); 465 466 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 467 Align = std::max(Align, AA->getAlignment()); 468 469 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 470 QualType T = VD->getType(); 471 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 472 unsigned AS = RT->getPointeeType().getAddressSpace(); 473 Align = Target.getPointerAlign(AS); 474 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 475 // Incomplete or function types default to 1. 476 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 477 T = cast<ArrayType>(T)->getElementType(); 478 479 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 480 } 481 } 482 483 return Align / Target.getCharWidth(); 484} 485 486/// getTypeSize - Return the size of the specified type, in bits. This method 487/// does not work on incomplete types. 488std::pair<uint64_t, unsigned> 489ASTContext::getTypeInfo(const Type *T) { 490 uint64_t Width=0; 491 unsigned Align=8; 492 switch (T->getTypeClass()) { 493#define TYPE(Class, Base) 494#define ABSTRACT_TYPE(Class, Base) 495#define NON_CANONICAL_TYPE(Class, Base) 496#define DEPENDENT_TYPE(Class, Base) case Type::Class: 497#include "clang/AST/TypeNodes.def" 498 assert(false && "Should not see dependent types"); 499 break; 500 501 case Type::FunctionNoProto: 502 case Type::FunctionProto: 503 // GCC extension: alignof(function) = 32 bits 504 Width = 0; 505 Align = 32; 506 break; 507 508 case Type::IncompleteArray: 509 case Type::VariableArray: 510 Width = 0; 511 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 512 break; 513 514 case Type::ConstantArrayWithExpr: 515 case Type::ConstantArrayWithoutExpr: 516 case Type::ConstantArray: { 517 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 518 519 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 520 Width = EltInfo.first*CAT->getSize().getZExtValue(); 521 Align = EltInfo.second; 522 break; 523 } 524 case Type::ExtVector: 525 case Type::Vector: { 526 std::pair<uint64_t, unsigned> EltInfo = 527 getTypeInfo(cast<VectorType>(T)->getElementType()); 528 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 529 Align = Width; 530 // If the alignment is not a power of 2, round up to the next power of 2. 531 // This happens for non-power-of-2 length vectors. 532 // FIXME: this should probably be a target property. 533 Align = 1 << llvm::Log2_32_Ceil(Align); 534 break; 535 } 536 537 case Type::Builtin: 538 switch (cast<BuiltinType>(T)->getKind()) { 539 default: assert(0 && "Unknown builtin type!"); 540 case BuiltinType::Void: 541 // GCC extension: alignof(void) = 8 bits. 542 Width = 0; 543 Align = 8; 544 break; 545 546 case BuiltinType::Bool: 547 Width = Target.getBoolWidth(); 548 Align = Target.getBoolAlign(); 549 break; 550 case BuiltinType::Char_S: 551 case BuiltinType::Char_U: 552 case BuiltinType::UChar: 553 case BuiltinType::SChar: 554 Width = Target.getCharWidth(); 555 Align = Target.getCharAlign(); 556 break; 557 case BuiltinType::WChar: 558 Width = Target.getWCharWidth(); 559 Align = Target.getWCharAlign(); 560 break; 561 case BuiltinType::Char16: 562 Width = Target.getChar16Width(); 563 Align = Target.getChar16Align(); 564 break; 565 case BuiltinType::Char32: 566 Width = Target.getChar32Width(); 567 Align = Target.getChar32Align(); 568 break; 569 case BuiltinType::UShort: 570 case BuiltinType::Short: 571 Width = Target.getShortWidth(); 572 Align = Target.getShortAlign(); 573 break; 574 case BuiltinType::UInt: 575 case BuiltinType::Int: 576 Width = Target.getIntWidth(); 577 Align = Target.getIntAlign(); 578 break; 579 case BuiltinType::ULong: 580 case BuiltinType::Long: 581 Width = Target.getLongWidth(); 582 Align = Target.getLongAlign(); 583 break; 584 case BuiltinType::ULongLong: 585 case BuiltinType::LongLong: 586 Width = Target.getLongLongWidth(); 587 Align = Target.getLongLongAlign(); 588 break; 589 case BuiltinType::Int128: 590 case BuiltinType::UInt128: 591 Width = 128; 592 Align = 128; // int128_t is 128-bit aligned on all targets. 593 break; 594 case BuiltinType::Float: 595 Width = Target.getFloatWidth(); 596 Align = Target.getFloatAlign(); 597 break; 598 case BuiltinType::Double: 599 Width = Target.getDoubleWidth(); 600 Align = Target.getDoubleAlign(); 601 break; 602 case BuiltinType::LongDouble: 603 Width = Target.getLongDoubleWidth(); 604 Align = Target.getLongDoubleAlign(); 605 break; 606 case BuiltinType::NullPtr: 607 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 608 Align = Target.getPointerAlign(0); // == sizeof(void*) 609 break; 610 } 611 break; 612 case Type::FixedWidthInt: 613 // FIXME: This isn't precisely correct; the width/alignment should depend 614 // on the available types for the target 615 Width = cast<FixedWidthIntType>(T)->getWidth(); 616 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 617 Align = Width; 618 break; 619 case Type::ExtQual: 620 // FIXME: Pointers into different addr spaces could have different sizes and 621 // alignment requirements: getPointerInfo should take an AddrSpace. 622 return getTypeInfo(QualType(cast<ExtQualType>(T)->getBaseType(), 0)); 623 case Type::ObjCObjectPointer: 624 Width = Target.getPointerWidth(0); 625 Align = Target.getPointerAlign(0); 626 break; 627 case Type::BlockPointer: { 628 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 629 Width = Target.getPointerWidth(AS); 630 Align = Target.getPointerAlign(AS); 631 break; 632 } 633 case Type::Pointer: { 634 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 635 Width = Target.getPointerWidth(AS); 636 Align = Target.getPointerAlign(AS); 637 break; 638 } 639 case Type::LValueReference: 640 case Type::RValueReference: 641 // "When applied to a reference or a reference type, the result is the size 642 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 643 // FIXME: This is wrong for struct layout: a reference in a struct has 644 // pointer size. 645 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 646 case Type::MemberPointer: { 647 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 648 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 649 // If we ever want to support other ABIs this needs to be abstracted. 650 651 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 652 std::pair<uint64_t, unsigned> PtrDiffInfo = 653 getTypeInfo(getPointerDiffType()); 654 Width = PtrDiffInfo.first; 655 if (Pointee->isFunctionType()) 656 Width *= 2; 657 Align = PtrDiffInfo.second; 658 break; 659 } 660 case Type::Complex: { 661 // Complex types have the same alignment as their elements, but twice the 662 // size. 663 std::pair<uint64_t, unsigned> EltInfo = 664 getTypeInfo(cast<ComplexType>(T)->getElementType()); 665 Width = EltInfo.first*2; 666 Align = EltInfo.second; 667 break; 668 } 669 case Type::ObjCInterface: { 670 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 671 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 672 Width = Layout.getSize(); 673 Align = Layout.getAlignment(); 674 break; 675 } 676 case Type::Record: 677 case Type::Enum: { 678 const TagType *TT = cast<TagType>(T); 679 680 if (TT->getDecl()->isInvalidDecl()) { 681 Width = 1; 682 Align = 1; 683 break; 684 } 685 686 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 687 return getTypeInfo(ET->getDecl()->getIntegerType()); 688 689 const RecordType *RT = cast<RecordType>(TT); 690 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 691 Width = Layout.getSize(); 692 Align = Layout.getAlignment(); 693 break; 694 } 695 696 case Type::Typedef: { 697 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 698 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 699 Align = Aligned->getAlignment(); 700 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 701 } else 702 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 703 break; 704 } 705 706 case Type::TypeOfExpr: 707 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 708 .getTypePtr()); 709 710 case Type::TypeOf: 711 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 712 713 case Type::Decltype: 714 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 715 .getTypePtr()); 716 717 case Type::QualifiedName: 718 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 719 720 case Type::TemplateSpecialization: 721 assert(getCanonicalType(T) != T && 722 "Cannot request the size of a dependent type"); 723 // FIXME: this is likely to be wrong once we support template 724 // aliases, since a template alias could refer to a typedef that 725 // has an __aligned__ attribute on it. 726 return getTypeInfo(getCanonicalType(T)); 727 } 728 729 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 730 return std::make_pair(Width, Align); 731} 732 733/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 734/// type for the current target in bits. This can be different than the ABI 735/// alignment in cases where it is beneficial for performance to overalign 736/// a data type. 737unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 738 unsigned ABIAlign = getTypeAlign(T); 739 740 // Double and long long should be naturally aligned if possible. 741 if (const ComplexType* CT = T->getAsComplexType()) 742 T = CT->getElementType().getTypePtr(); 743 if (T->isSpecificBuiltinType(BuiltinType::Double) || 744 T->isSpecificBuiltinType(BuiltinType::LongLong)) 745 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 746 747 return ABIAlign; 748} 749 750static void CollectLocalObjCIvars(ASTContext *Ctx, 751 const ObjCInterfaceDecl *OI, 752 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 753 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 754 E = OI->ivar_end(); I != E; ++I) { 755 ObjCIvarDecl *IVDecl = *I; 756 if (!IVDecl->isInvalidDecl()) 757 Fields.push_back(cast<FieldDecl>(IVDecl)); 758 } 759} 760 761void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 762 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 763 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 764 CollectObjCIvars(SuperClass, Fields); 765 CollectLocalObjCIvars(this, OI, Fields); 766} 767 768/// ShallowCollectObjCIvars - 769/// Collect all ivars, including those synthesized, in the current class. 770/// 771void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 772 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 773 bool CollectSynthesized) { 774 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 775 E = OI->ivar_end(); I != E; ++I) { 776 Ivars.push_back(*I); 777 } 778 if (CollectSynthesized) 779 CollectSynthesizedIvars(OI, Ivars); 780} 781 782void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 783 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 784 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 785 E = PD->prop_end(); I != E; ++I) 786 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 787 Ivars.push_back(Ivar); 788 789 // Also look into nested protocols. 790 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 791 E = PD->protocol_end(); P != E; ++P) 792 CollectProtocolSynthesizedIvars(*P, Ivars); 793} 794 795/// CollectSynthesizedIvars - 796/// This routine collect synthesized ivars for the designated class. 797/// 798void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 799 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 800 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 801 E = OI->prop_end(); I != E; ++I) { 802 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 803 Ivars.push_back(Ivar); 804 } 805 // Also look into interface's protocol list for properties declared 806 // in the protocol and whose ivars are synthesized. 807 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 808 PE = OI->protocol_end(); P != PE; ++P) { 809 ObjCProtocolDecl *PD = (*P); 810 CollectProtocolSynthesizedIvars(PD, Ivars); 811 } 812} 813 814unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 815 unsigned count = 0; 816 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 817 E = PD->prop_end(); I != E; ++I) 818 if ((*I)->getPropertyIvarDecl()) 819 ++count; 820 821 // Also look into nested protocols. 822 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 823 E = PD->protocol_end(); P != E; ++P) 824 count += CountProtocolSynthesizedIvars(*P); 825 return count; 826} 827 828unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) 829{ 830 unsigned count = 0; 831 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 832 E = OI->prop_end(); I != E; ++I) { 833 if ((*I)->getPropertyIvarDecl()) 834 ++count; 835 } 836 // Also look into interface's protocol list for properties declared 837 // in the protocol and whose ivars are synthesized. 838 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 839 PE = OI->protocol_end(); P != PE; ++P) { 840 ObjCProtocolDecl *PD = (*P); 841 count += CountProtocolSynthesizedIvars(PD); 842 } 843 return count; 844} 845 846/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 847ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 848 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 849 I = ObjCImpls.find(D); 850 if (I != ObjCImpls.end()) 851 return cast<ObjCImplementationDecl>(I->second); 852 return 0; 853} 854/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 855ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 856 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 857 I = ObjCImpls.find(D); 858 if (I != ObjCImpls.end()) 859 return cast<ObjCCategoryImplDecl>(I->second); 860 return 0; 861} 862 863/// \brief Set the implementation of ObjCInterfaceDecl. 864void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 865 ObjCImplementationDecl *ImplD) { 866 assert(IFaceD && ImplD && "Passed null params"); 867 ObjCImpls[IFaceD] = ImplD; 868} 869/// \brief Set the implementation of ObjCCategoryDecl. 870void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 871 ObjCCategoryImplDecl *ImplD) { 872 assert(CatD && ImplD && "Passed null params"); 873 ObjCImpls[CatD] = ImplD; 874} 875 876/// getInterfaceLayoutImpl - Get or compute information about the 877/// layout of the given interface. 878/// 879/// \param Impl - If given, also include the layout of the interface's 880/// implementation. This may differ by including synthesized ivars. 881const ASTRecordLayout & 882ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 883 const ObjCImplementationDecl *Impl) { 884 assert(!D->isForwardDecl() && "Invalid interface decl!"); 885 886 // Look up this layout, if already laid out, return what we have. 887 ObjCContainerDecl *Key = 888 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 889 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 890 return *Entry; 891 892 // Add in synthesized ivar count if laying out an implementation. 893 if (Impl) { 894 unsigned FieldCount = D->ivar_size(); 895 unsigned SynthCount = CountSynthesizedIvars(D); 896 FieldCount += SynthCount; 897 // If there aren't any sythesized ivars then reuse the interface 898 // entry. Note we can't cache this because we simply free all 899 // entries later; however we shouldn't look up implementations 900 // frequently. 901 if (SynthCount == 0) 902 return getObjCLayout(D, 0); 903 } 904 905 const ASTRecordLayout *NewEntry = 906 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 907 ObjCLayouts[Key] = NewEntry; 908 909 return *NewEntry; 910} 911 912const ASTRecordLayout & 913ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 914 return getObjCLayout(D, 0); 915} 916 917const ASTRecordLayout & 918ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 919 return getObjCLayout(D->getClassInterface(), D); 920} 921 922/// getASTRecordLayout - Get or compute information about the layout of the 923/// specified record (struct/union/class), which indicates its size and field 924/// position information. 925const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 926 D = D->getDefinition(*this); 927 assert(D && "Cannot get layout of forward declarations!"); 928 929 // Look up this layout, if already laid out, return what we have. 930 // Note that we can't save a reference to the entry because this function 931 // is recursive. 932 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 933 if (Entry) return *Entry; 934 935 const ASTRecordLayout *NewEntry = 936 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 937 ASTRecordLayouts[D] = NewEntry; 938 939 return *NewEntry; 940} 941 942//===----------------------------------------------------------------------===// 943// Type creation/memoization methods 944//===----------------------------------------------------------------------===// 945 946QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 947 QualType CanT = getCanonicalType(T); 948 if (CanT.getAddressSpace() == AddressSpace) 949 return T; 950 951 // If we are composing extended qualifiers together, merge together into one 952 // ExtQualType node. 953 unsigned CVRQuals = T.getCVRQualifiers(); 954 QualType::GCAttrTypes GCAttr = QualType::GCNone; 955 Type *TypeNode = T.getTypePtr(); 956 957 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 958 // If this type already has an address space specified, it cannot get 959 // another one. 960 assert(EQT->getAddressSpace() == 0 && 961 "Type cannot be in multiple addr spaces!"); 962 GCAttr = EQT->getObjCGCAttr(); 963 TypeNode = EQT->getBaseType(); 964 } 965 966 // Check if we've already instantiated this type. 967 llvm::FoldingSetNodeID ID; 968 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 969 void *InsertPos = 0; 970 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 971 return QualType(EXTQy, CVRQuals); 972 973 // If the base type isn't canonical, this won't be a canonical type either, 974 // so fill in the canonical type field. 975 QualType Canonical; 976 if (!TypeNode->isCanonical()) { 977 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 978 979 // Update InsertPos, the previous call could have invalidated it. 980 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 981 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 982 } 983 ExtQualType *New = 984 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 985 ExtQualTypes.InsertNode(New, InsertPos); 986 Types.push_back(New); 987 return QualType(New, CVRQuals); 988} 989 990QualType ASTContext::getObjCGCQualType(QualType T, 991 QualType::GCAttrTypes GCAttr) { 992 QualType CanT = getCanonicalType(T); 993 if (CanT.getObjCGCAttr() == GCAttr) 994 return T; 995 996 if (T->isPointerType()) { 997 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 998 if (Pointee->isAnyPointerType()) { 999 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1000 return getPointerType(ResultType); 1001 } 1002 } 1003 // If we are composing extended qualifiers together, merge together into one 1004 // ExtQualType node. 1005 unsigned CVRQuals = T.getCVRQualifiers(); 1006 Type *TypeNode = T.getTypePtr(); 1007 unsigned AddressSpace = 0; 1008 1009 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 1010 // If this type already has an ObjCGC specified, it cannot get 1011 // another one. 1012 assert(EQT->getObjCGCAttr() == QualType::GCNone && 1013 "Type cannot have multiple ObjCGCs!"); 1014 AddressSpace = EQT->getAddressSpace(); 1015 TypeNode = EQT->getBaseType(); 1016 } 1017 1018 // Check if we've already instantiated an gc qual'd type of this type. 1019 llvm::FoldingSetNodeID ID; 1020 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 1021 void *InsertPos = 0; 1022 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 1023 return QualType(EXTQy, CVRQuals); 1024 1025 // If the base type isn't canonical, this won't be a canonical type either, 1026 // so fill in the canonical type field. 1027 // FIXME: Isn't this also not canonical if the base type is a array 1028 // or pointer type? I can't find any documentation for objc_gc, though... 1029 QualType Canonical; 1030 if (!T->isCanonical()) { 1031 Canonical = getObjCGCQualType(CanT, GCAttr); 1032 1033 // Update InsertPos, the previous call could have invalidated it. 1034 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 1035 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1036 } 1037 ExtQualType *New = 1038 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 1039 ExtQualTypes.InsertNode(New, InsertPos); 1040 Types.push_back(New); 1041 return QualType(New, CVRQuals); 1042} 1043 1044QualType ASTContext::getNoReturnType(QualType T) { 1045 QualifierSet qs; 1046 qs.strip(T); 1047 if (T->isPointerType()) { 1048 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1049 QualType ResultType = getNoReturnType(Pointee); 1050 ResultType = getPointerType(ResultType); 1051 ResultType.setCVRQualifiers(T.getCVRQualifiers()); 1052 return qs.apply(ResultType, *this); 1053 } 1054 if (T->isBlockPointerType()) { 1055 QualType Pointee = T->getAs<BlockPointerType>()->getPointeeType(); 1056 QualType ResultType = getNoReturnType(Pointee); 1057 ResultType = getBlockPointerType(ResultType); 1058 ResultType.setCVRQualifiers(T.getCVRQualifiers()); 1059 return qs.apply(ResultType, *this); 1060 } 1061 if (!T->isFunctionType()) 1062 assert(0 && "can't noreturn qualify non-pointer to function or block type"); 1063 1064 if (const FunctionNoProtoType *F = T->getAsFunctionNoProtoType()) { 1065 return getFunctionNoProtoType(F->getResultType(), true); 1066 } 1067 const FunctionProtoType *F = T->getAsFunctionProtoType(); 1068 return getFunctionType(F->getResultType(), F->arg_type_begin(), 1069 F->getNumArgs(), F->isVariadic(), F->getTypeQuals(), 1070 F->hasExceptionSpec(), F->hasAnyExceptionSpec(), 1071 F->getNumExceptions(), F->exception_begin(), true); 1072} 1073 1074/// getComplexType - Return the uniqued reference to the type for a complex 1075/// number with the specified element type. 1076QualType ASTContext::getComplexType(QualType T) { 1077 // Unique pointers, to guarantee there is only one pointer of a particular 1078 // structure. 1079 llvm::FoldingSetNodeID ID; 1080 ComplexType::Profile(ID, T); 1081 1082 void *InsertPos = 0; 1083 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1084 return QualType(CT, 0); 1085 1086 // If the pointee type isn't canonical, this won't be a canonical type either, 1087 // so fill in the canonical type field. 1088 QualType Canonical; 1089 if (!T->isCanonical()) { 1090 Canonical = getComplexType(getCanonicalType(T)); 1091 1092 // Get the new insert position for the node we care about. 1093 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1094 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1095 } 1096 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 1097 Types.push_back(New); 1098 ComplexTypes.InsertNode(New, InsertPos); 1099 return QualType(New, 0); 1100} 1101 1102QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1103 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1104 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1105 FixedWidthIntType *&Entry = Map[Width]; 1106 if (!Entry) 1107 Entry = new FixedWidthIntType(Width, Signed); 1108 return QualType(Entry, 0); 1109} 1110 1111/// getPointerType - Return the uniqued reference to the type for a pointer to 1112/// the specified type. 1113QualType ASTContext::getPointerType(QualType T) { 1114 // Unique pointers, to guarantee there is only one pointer of a particular 1115 // structure. 1116 llvm::FoldingSetNodeID ID; 1117 PointerType::Profile(ID, T); 1118 1119 void *InsertPos = 0; 1120 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1121 return QualType(PT, 0); 1122 1123 // If the pointee type isn't canonical, this won't be a canonical type either, 1124 // so fill in the canonical type field. 1125 QualType Canonical; 1126 if (!T->isCanonical()) { 1127 Canonical = getPointerType(getCanonicalType(T)); 1128 1129 // Get the new insert position for the node we care about. 1130 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1131 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1132 } 1133 PointerType *New = new (*this,8) PointerType(T, Canonical); 1134 Types.push_back(New); 1135 PointerTypes.InsertNode(New, InsertPos); 1136 return QualType(New, 0); 1137} 1138 1139/// getBlockPointerType - Return the uniqued reference to the type for 1140/// a pointer to the specified block. 1141QualType ASTContext::getBlockPointerType(QualType T) { 1142 assert(T->isFunctionType() && "block of function types only"); 1143 // Unique pointers, to guarantee there is only one block of a particular 1144 // structure. 1145 llvm::FoldingSetNodeID ID; 1146 BlockPointerType::Profile(ID, T); 1147 1148 void *InsertPos = 0; 1149 if (BlockPointerType *PT = 1150 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1151 return QualType(PT, 0); 1152 1153 // If the block pointee type isn't canonical, this won't be a canonical 1154 // type either so fill in the canonical type field. 1155 QualType Canonical; 1156 if (!T->isCanonical()) { 1157 Canonical = getBlockPointerType(getCanonicalType(T)); 1158 1159 // Get the new insert position for the node we care about. 1160 BlockPointerType *NewIP = 1161 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1162 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1163 } 1164 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 1165 Types.push_back(New); 1166 BlockPointerTypes.InsertNode(New, InsertPos); 1167 return QualType(New, 0); 1168} 1169 1170/// getLValueReferenceType - Return the uniqued reference to the type for an 1171/// lvalue reference to the specified type. 1172QualType ASTContext::getLValueReferenceType(QualType T) { 1173 // Unique pointers, to guarantee there is only one pointer of a particular 1174 // structure. 1175 llvm::FoldingSetNodeID ID; 1176 ReferenceType::Profile(ID, T); 1177 1178 void *InsertPos = 0; 1179 if (LValueReferenceType *RT = 1180 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1181 return QualType(RT, 0); 1182 1183 // If the referencee type isn't canonical, this won't be a canonical type 1184 // either, so fill in the canonical type field. 1185 QualType Canonical; 1186 if (!T->isCanonical()) { 1187 Canonical = getLValueReferenceType(getCanonicalType(T)); 1188 1189 // Get the new insert position for the node we care about. 1190 LValueReferenceType *NewIP = 1191 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1192 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1193 } 1194 1195 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 1196 Types.push_back(New); 1197 LValueReferenceTypes.InsertNode(New, InsertPos); 1198 return QualType(New, 0); 1199} 1200 1201/// getRValueReferenceType - Return the uniqued reference to the type for an 1202/// rvalue reference to the specified type. 1203QualType ASTContext::getRValueReferenceType(QualType T) { 1204 // Unique pointers, to guarantee there is only one pointer of a particular 1205 // structure. 1206 llvm::FoldingSetNodeID ID; 1207 ReferenceType::Profile(ID, T); 1208 1209 void *InsertPos = 0; 1210 if (RValueReferenceType *RT = 1211 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1212 return QualType(RT, 0); 1213 1214 // If the referencee type isn't canonical, this won't be a canonical type 1215 // either, so fill in the canonical type field. 1216 QualType Canonical; 1217 if (!T->isCanonical()) { 1218 Canonical = getRValueReferenceType(getCanonicalType(T)); 1219 1220 // Get the new insert position for the node we care about. 1221 RValueReferenceType *NewIP = 1222 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1223 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1224 } 1225 1226 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 1227 Types.push_back(New); 1228 RValueReferenceTypes.InsertNode(New, InsertPos); 1229 return QualType(New, 0); 1230} 1231 1232/// getMemberPointerType - Return the uniqued reference to the type for a 1233/// member pointer to the specified type, in the specified class. 1234QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1235{ 1236 // Unique pointers, to guarantee there is only one pointer of a particular 1237 // structure. 1238 llvm::FoldingSetNodeID ID; 1239 MemberPointerType::Profile(ID, T, Cls); 1240 1241 void *InsertPos = 0; 1242 if (MemberPointerType *PT = 1243 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1244 return QualType(PT, 0); 1245 1246 // If the pointee or class type isn't canonical, this won't be a canonical 1247 // type either, so fill in the canonical type field. 1248 QualType Canonical; 1249 if (!T->isCanonical()) { 1250 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1251 1252 // Get the new insert position for the node we care about. 1253 MemberPointerType *NewIP = 1254 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1255 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1256 } 1257 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1258 Types.push_back(New); 1259 MemberPointerTypes.InsertNode(New, InsertPos); 1260 return QualType(New, 0); 1261} 1262 1263/// getConstantArrayType - Return the unique reference to the type for an 1264/// array of the specified element type. 1265QualType ASTContext::getConstantArrayType(QualType EltTy, 1266 const llvm::APInt &ArySizeIn, 1267 ArrayType::ArraySizeModifier ASM, 1268 unsigned EltTypeQuals) { 1269 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1270 "Constant array of VLAs is illegal!"); 1271 1272 // Convert the array size into a canonical width matching the pointer size for 1273 // the target. 1274 llvm::APInt ArySize(ArySizeIn); 1275 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1276 1277 llvm::FoldingSetNodeID ID; 1278 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1279 1280 void *InsertPos = 0; 1281 if (ConstantArrayType *ATP = 1282 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1283 return QualType(ATP, 0); 1284 1285 // If the element type isn't canonical, this won't be a canonical type either, 1286 // so fill in the canonical type field. 1287 QualType Canonical; 1288 if (!EltTy->isCanonical()) { 1289 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1290 ASM, EltTypeQuals); 1291 // Get the new insert position for the node we care about. 1292 ConstantArrayType *NewIP = 1293 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1294 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1295 } 1296 1297 ConstantArrayType *New = 1298 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1299 ConstantArrayTypes.InsertNode(New, InsertPos); 1300 Types.push_back(New); 1301 return QualType(New, 0); 1302} 1303 1304/// getConstantArrayWithExprType - Return a reference to the type for 1305/// an array of the specified element type. 1306QualType 1307ASTContext::getConstantArrayWithExprType(QualType EltTy, 1308 const llvm::APInt &ArySizeIn, 1309 Expr *ArySizeExpr, 1310 ArrayType::ArraySizeModifier ASM, 1311 unsigned EltTypeQuals, 1312 SourceRange Brackets) { 1313 // Convert the array size into a canonical width matching the pointer 1314 // size for the target. 1315 llvm::APInt ArySize(ArySizeIn); 1316 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1317 1318 // Compute the canonical ConstantArrayType. 1319 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1320 ArySize, ASM, EltTypeQuals); 1321 // Since we don't unique expressions, it isn't possible to unique VLA's 1322 // that have an expression provided for their size. 1323 ConstantArrayWithExprType *New = 1324 new(*this,8)ConstantArrayWithExprType(EltTy, Canonical, 1325 ArySize, ArySizeExpr, 1326 ASM, EltTypeQuals, Brackets); 1327 Types.push_back(New); 1328 return QualType(New, 0); 1329} 1330 1331/// getConstantArrayWithoutExprType - Return a reference to the type for 1332/// an array of the specified element type. 1333QualType 1334ASTContext::getConstantArrayWithoutExprType(QualType EltTy, 1335 const llvm::APInt &ArySizeIn, 1336 ArrayType::ArraySizeModifier ASM, 1337 unsigned EltTypeQuals) { 1338 // Convert the array size into a canonical width matching the pointer 1339 // size for the target. 1340 llvm::APInt ArySize(ArySizeIn); 1341 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1342 1343 // Compute the canonical ConstantArrayType. 1344 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1345 ArySize, ASM, EltTypeQuals); 1346 ConstantArrayWithoutExprType *New = 1347 new(*this,8)ConstantArrayWithoutExprType(EltTy, Canonical, 1348 ArySize, ASM, EltTypeQuals); 1349 Types.push_back(New); 1350 return QualType(New, 0); 1351} 1352 1353/// getVariableArrayType - Returns a non-unique reference to the type for a 1354/// variable array of the specified element type. 1355QualType ASTContext::getVariableArrayType(QualType EltTy, 1356 Expr *NumElts, 1357 ArrayType::ArraySizeModifier ASM, 1358 unsigned EltTypeQuals, 1359 SourceRange Brackets) { 1360 // Since we don't unique expressions, it isn't possible to unique VLA's 1361 // that have an expression provided for their size. 1362 1363 VariableArrayType *New = 1364 new(*this,8)VariableArrayType(EltTy, QualType(), 1365 NumElts, ASM, EltTypeQuals, Brackets); 1366 1367 VariableArrayTypes.push_back(New); 1368 Types.push_back(New); 1369 return QualType(New, 0); 1370} 1371 1372/// getDependentSizedArrayType - Returns a non-unique reference to 1373/// the type for a dependently-sized array of the specified element 1374/// type. 1375QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1376 Expr *NumElts, 1377 ArrayType::ArraySizeModifier ASM, 1378 unsigned EltTypeQuals, 1379 SourceRange Brackets) { 1380 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1381 "Size must be type- or value-dependent!"); 1382 1383 llvm::FoldingSetNodeID ID; 1384 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1385 EltTypeQuals, NumElts); 1386 1387 void *InsertPos = 0; 1388 DependentSizedArrayType *Canon 1389 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1390 DependentSizedArrayType *New; 1391 if (Canon) { 1392 // We already have a canonical version of this array type; use it as 1393 // the canonical type for a newly-built type. 1394 New = new (*this,8) DependentSizedArrayType(*this, EltTy, 1395 QualType(Canon, 0), 1396 NumElts, ASM, EltTypeQuals, 1397 Brackets); 1398 } else { 1399 QualType CanonEltTy = getCanonicalType(EltTy); 1400 if (CanonEltTy == EltTy) { 1401 New = new (*this,8) DependentSizedArrayType(*this, EltTy, QualType(), 1402 NumElts, ASM, EltTypeQuals, 1403 Brackets); 1404 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1405 } else { 1406 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1407 ASM, EltTypeQuals, 1408 SourceRange()); 1409 New = new (*this,8) DependentSizedArrayType(*this, EltTy, Canon, 1410 NumElts, ASM, EltTypeQuals, 1411 Brackets); 1412 } 1413 } 1414 1415 Types.push_back(New); 1416 return QualType(New, 0); 1417} 1418 1419QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1420 ArrayType::ArraySizeModifier ASM, 1421 unsigned EltTypeQuals) { 1422 llvm::FoldingSetNodeID ID; 1423 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1424 1425 void *InsertPos = 0; 1426 if (IncompleteArrayType *ATP = 1427 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1428 return QualType(ATP, 0); 1429 1430 // If the element type isn't canonical, this won't be a canonical type 1431 // either, so fill in the canonical type field. 1432 QualType Canonical; 1433 1434 if (!EltTy->isCanonical()) { 1435 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1436 ASM, EltTypeQuals); 1437 1438 // Get the new insert position for the node we care about. 1439 IncompleteArrayType *NewIP = 1440 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1441 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1442 } 1443 1444 IncompleteArrayType *New 1445 = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1446 ASM, EltTypeQuals); 1447 1448 IncompleteArrayTypes.InsertNode(New, InsertPos); 1449 Types.push_back(New); 1450 return QualType(New, 0); 1451} 1452 1453/// getVectorType - Return the unique reference to a vector type of 1454/// the specified element type and size. VectorType must be a built-in type. 1455QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1456 BuiltinType *baseType; 1457 1458 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1459 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1460 1461 // Check if we've already instantiated a vector of this type. 1462 llvm::FoldingSetNodeID ID; 1463 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1464 void *InsertPos = 0; 1465 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1466 return QualType(VTP, 0); 1467 1468 // If the element type isn't canonical, this won't be a canonical type either, 1469 // so fill in the canonical type field. 1470 QualType Canonical; 1471 if (!vecType->isCanonical()) { 1472 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1473 1474 // Get the new insert position for the node we care about. 1475 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1476 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1477 } 1478 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1479 VectorTypes.InsertNode(New, InsertPos); 1480 Types.push_back(New); 1481 return QualType(New, 0); 1482} 1483 1484/// getExtVectorType - Return the unique reference to an extended vector type of 1485/// the specified element type and size. VectorType must be a built-in type. 1486QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1487 BuiltinType *baseType; 1488 1489 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1490 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1491 1492 // Check if we've already instantiated a vector of this type. 1493 llvm::FoldingSetNodeID ID; 1494 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1495 void *InsertPos = 0; 1496 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1497 return QualType(VTP, 0); 1498 1499 // If the element type isn't canonical, this won't be a canonical type either, 1500 // so fill in the canonical type field. 1501 QualType Canonical; 1502 if (!vecType->isCanonical()) { 1503 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1504 1505 // Get the new insert position for the node we care about. 1506 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1507 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1508 } 1509 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1510 VectorTypes.InsertNode(New, InsertPos); 1511 Types.push_back(New); 1512 return QualType(New, 0); 1513} 1514 1515QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1516 Expr *SizeExpr, 1517 SourceLocation AttrLoc) { 1518 llvm::FoldingSetNodeID ID; 1519 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1520 SizeExpr); 1521 1522 void *InsertPos = 0; 1523 DependentSizedExtVectorType *Canon 1524 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1525 DependentSizedExtVectorType *New; 1526 if (Canon) { 1527 // We already have a canonical version of this array type; use it as 1528 // the canonical type for a newly-built type. 1529 New = new (*this,8) DependentSizedExtVectorType(*this, vecType, 1530 QualType(Canon, 0), 1531 SizeExpr, AttrLoc); 1532 } else { 1533 QualType CanonVecTy = getCanonicalType(vecType); 1534 if (CanonVecTy == vecType) { 1535 New = new (*this,8) DependentSizedExtVectorType(*this, vecType, 1536 QualType(), SizeExpr, 1537 AttrLoc); 1538 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1539 } else { 1540 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1541 SourceLocation()); 1542 New = new (*this,8) DependentSizedExtVectorType(*this, vecType, Canon, 1543 SizeExpr, AttrLoc); 1544 } 1545 } 1546 1547 Types.push_back(New); 1548 return QualType(New, 0); 1549} 1550 1551/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1552/// 1553QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1554 // Unique functions, to guarantee there is only one function of a particular 1555 // structure. 1556 llvm::FoldingSetNodeID ID; 1557 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1558 1559 void *InsertPos = 0; 1560 if (FunctionNoProtoType *FT = 1561 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1562 return QualType(FT, 0); 1563 1564 QualType Canonical; 1565 if (!ResultTy->isCanonical()) { 1566 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1567 1568 // Get the new insert position for the node we care about. 1569 FunctionNoProtoType *NewIP = 1570 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1571 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1572 } 1573 1574 FunctionNoProtoType *New 1575 = new (*this,8) FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1576 Types.push_back(New); 1577 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1578 return QualType(New, 0); 1579} 1580 1581/// getFunctionType - Return a normal function type with a typed argument 1582/// list. isVariadic indicates whether the argument list includes '...'. 1583QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1584 unsigned NumArgs, bool isVariadic, 1585 unsigned TypeQuals, bool hasExceptionSpec, 1586 bool hasAnyExceptionSpec, unsigned NumExs, 1587 const QualType *ExArray, bool NoReturn) { 1588 // Unique functions, to guarantee there is only one function of a particular 1589 // structure. 1590 llvm::FoldingSetNodeID ID; 1591 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1592 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1593 NumExs, ExArray, NoReturn); 1594 1595 void *InsertPos = 0; 1596 if (FunctionProtoType *FTP = 1597 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1598 return QualType(FTP, 0); 1599 1600 // Determine whether the type being created is already canonical or not. 1601 bool isCanonical = ResultTy->isCanonical(); 1602 if (hasExceptionSpec) 1603 isCanonical = false; 1604 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1605 if (!ArgArray[i]->isCanonical()) 1606 isCanonical = false; 1607 1608 // If this type isn't canonical, get the canonical version of it. 1609 // The exception spec is not part of the canonical type. 1610 QualType Canonical; 1611 if (!isCanonical) { 1612 llvm::SmallVector<QualType, 16> CanonicalArgs; 1613 CanonicalArgs.reserve(NumArgs); 1614 for (unsigned i = 0; i != NumArgs; ++i) 1615 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1616 1617 Canonical = getFunctionType(getCanonicalType(ResultTy), 1618 CanonicalArgs.data(), NumArgs, 1619 isVariadic, TypeQuals, NoReturn); 1620 1621 // Get the new insert position for the node we care about. 1622 FunctionProtoType *NewIP = 1623 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1624 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1625 } 1626 1627 // FunctionProtoType objects are allocated with extra bytes after them 1628 // for two variable size arrays (for parameter and exception types) at the 1629 // end of them. 1630 FunctionProtoType *FTP = 1631 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1632 NumArgs*sizeof(QualType) + 1633 NumExs*sizeof(QualType), 8); 1634 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1635 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1636 ExArray, NumExs, Canonical, NoReturn); 1637 Types.push_back(FTP); 1638 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1639 return QualType(FTP, 0); 1640} 1641 1642/// getTypeDeclType - Return the unique reference to the type for the 1643/// specified type declaration. 1644QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1645 assert(Decl && "Passed null for Decl param"); 1646 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1647 1648 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1649 return getTypedefType(Typedef); 1650 else if (isa<TemplateTypeParmDecl>(Decl)) { 1651 assert(false && "Template type parameter types are always available."); 1652 } else if (ObjCInterfaceDecl *ObjCInterface 1653 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1654 return getObjCInterfaceType(ObjCInterface); 1655 1656 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1657 if (PrevDecl) 1658 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1659 else 1660 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1661 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1662 if (PrevDecl) 1663 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1664 else 1665 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1666 } else 1667 assert(false && "TypeDecl without a type?"); 1668 1669 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1670 return QualType(Decl->TypeForDecl, 0); 1671} 1672 1673/// getTypedefType - Return the unique reference to the type for the 1674/// specified typename decl. 1675QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1676 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1677 1678 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1679 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1680 Types.push_back(Decl->TypeForDecl); 1681 return QualType(Decl->TypeForDecl, 0); 1682} 1683 1684/// \brief Retrieve the template type parameter type for a template 1685/// parameter or parameter pack with the given depth, index, and (optionally) 1686/// name. 1687QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1688 bool ParameterPack, 1689 IdentifierInfo *Name) { 1690 llvm::FoldingSetNodeID ID; 1691 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1692 void *InsertPos = 0; 1693 TemplateTypeParmType *TypeParm 1694 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1695 1696 if (TypeParm) 1697 return QualType(TypeParm, 0); 1698 1699 if (Name) { 1700 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1701 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack, 1702 Name, Canon); 1703 } else 1704 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack); 1705 1706 Types.push_back(TypeParm); 1707 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1708 1709 return QualType(TypeParm, 0); 1710} 1711 1712QualType 1713ASTContext::getTemplateSpecializationType(TemplateName Template, 1714 const TemplateArgument *Args, 1715 unsigned NumArgs, 1716 QualType Canon) { 1717 if (!Canon.isNull()) 1718 Canon = getCanonicalType(Canon); 1719 else { 1720 // Build the canonical template specialization type. 1721 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1722 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1723 CanonArgs.reserve(NumArgs); 1724 for (unsigned I = 0; I != NumArgs; ++I) 1725 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1726 1727 // Determine whether this canonical template specialization type already 1728 // exists. 1729 llvm::FoldingSetNodeID ID; 1730 TemplateSpecializationType::Profile(ID, CanonTemplate, 1731 CanonArgs.data(), NumArgs, *this); 1732 1733 void *InsertPos = 0; 1734 TemplateSpecializationType *Spec 1735 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1736 1737 if (!Spec) { 1738 // Allocate a new canonical template specialization type. 1739 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1740 sizeof(TemplateArgument) * NumArgs), 1741 8); 1742 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1743 CanonArgs.data(), NumArgs, 1744 Canon); 1745 Types.push_back(Spec); 1746 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1747 } 1748 1749 if (Canon.isNull()) 1750 Canon = QualType(Spec, 0); 1751 assert(Canon->isDependentType() && 1752 "Non-dependent template-id type must have a canonical type"); 1753 } 1754 1755 // Allocate the (non-canonical) template specialization type, but don't 1756 // try to unique it: these types typically have location information that 1757 // we don't unique and don't want to lose. 1758 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1759 sizeof(TemplateArgument) * NumArgs), 1760 8); 1761 TemplateSpecializationType *Spec 1762 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1763 Canon); 1764 1765 Types.push_back(Spec); 1766 return QualType(Spec, 0); 1767} 1768 1769QualType 1770ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1771 QualType NamedType) { 1772 llvm::FoldingSetNodeID ID; 1773 QualifiedNameType::Profile(ID, NNS, NamedType); 1774 1775 void *InsertPos = 0; 1776 QualifiedNameType *T 1777 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1778 if (T) 1779 return QualType(T, 0); 1780 1781 T = new (*this) QualifiedNameType(NNS, NamedType, 1782 getCanonicalType(NamedType)); 1783 Types.push_back(T); 1784 QualifiedNameTypes.InsertNode(T, InsertPos); 1785 return QualType(T, 0); 1786} 1787 1788QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1789 const IdentifierInfo *Name, 1790 QualType Canon) { 1791 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1792 1793 if (Canon.isNull()) { 1794 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1795 if (CanonNNS != NNS) 1796 Canon = getTypenameType(CanonNNS, Name); 1797 } 1798 1799 llvm::FoldingSetNodeID ID; 1800 TypenameType::Profile(ID, NNS, Name); 1801 1802 void *InsertPos = 0; 1803 TypenameType *T 1804 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1805 if (T) 1806 return QualType(T, 0); 1807 1808 T = new (*this) TypenameType(NNS, Name, Canon); 1809 Types.push_back(T); 1810 TypenameTypes.InsertNode(T, InsertPos); 1811 return QualType(T, 0); 1812} 1813 1814QualType 1815ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1816 const TemplateSpecializationType *TemplateId, 1817 QualType Canon) { 1818 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1819 1820 if (Canon.isNull()) { 1821 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1822 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1823 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1824 const TemplateSpecializationType *CanonTemplateId 1825 = CanonType->getAsTemplateSpecializationType(); 1826 assert(CanonTemplateId && 1827 "Canonical type must also be a template specialization type"); 1828 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1829 } 1830 } 1831 1832 llvm::FoldingSetNodeID ID; 1833 TypenameType::Profile(ID, NNS, TemplateId); 1834 1835 void *InsertPos = 0; 1836 TypenameType *T 1837 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1838 if (T) 1839 return QualType(T, 0); 1840 1841 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1842 Types.push_back(T); 1843 TypenameTypes.InsertNode(T, InsertPos); 1844 return QualType(T, 0); 1845} 1846 1847/// CmpProtocolNames - Comparison predicate for sorting protocols 1848/// alphabetically. 1849static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1850 const ObjCProtocolDecl *RHS) { 1851 return LHS->getDeclName() < RHS->getDeclName(); 1852} 1853 1854static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1855 unsigned &NumProtocols) { 1856 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1857 1858 // Sort protocols, keyed by name. 1859 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1860 1861 // Remove duplicates. 1862 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1863 NumProtocols = ProtocolsEnd-Protocols; 1864} 1865 1866/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1867/// the given interface decl and the conforming protocol list. 1868QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1869 ObjCProtocolDecl **Protocols, 1870 unsigned NumProtocols) { 1871 // Sort the protocol list alphabetically to canonicalize it. 1872 if (NumProtocols) 1873 SortAndUniqueProtocols(Protocols, NumProtocols); 1874 1875 llvm::FoldingSetNodeID ID; 1876 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1877 1878 void *InsertPos = 0; 1879 if (ObjCObjectPointerType *QT = 1880 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1881 return QualType(QT, 0); 1882 1883 // No Match; 1884 ObjCObjectPointerType *QType = 1885 new (*this,8) ObjCObjectPointerType(InterfaceT, Protocols, NumProtocols); 1886 1887 Types.push_back(QType); 1888 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1889 return QualType(QType, 0); 1890} 1891 1892/// getObjCInterfaceType - Return the unique reference to the type for the 1893/// specified ObjC interface decl. The list of protocols is optional. 1894QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1895 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1896 if (NumProtocols) 1897 // Sort the protocol list alphabetically to canonicalize it. 1898 SortAndUniqueProtocols(Protocols, NumProtocols); 1899 1900 llvm::FoldingSetNodeID ID; 1901 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1902 1903 void *InsertPos = 0; 1904 if (ObjCInterfaceType *QT = 1905 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1906 return QualType(QT, 0); 1907 1908 // No Match; 1909 ObjCInterfaceType *QType = 1910 new (*this,8) ObjCInterfaceType(const_cast<ObjCInterfaceDecl*>(Decl), 1911 Protocols, NumProtocols); 1912 Types.push_back(QType); 1913 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 1914 return QualType(QType, 0); 1915} 1916 1917/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1918/// TypeOfExprType AST's (since expression's are never shared). For example, 1919/// multiple declarations that refer to "typeof(x)" all contain different 1920/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1921/// on canonical type's (which are always unique). 1922QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1923 TypeOfExprType *toe; 1924 if (tofExpr->isTypeDependent()) { 1925 llvm::FoldingSetNodeID ID; 1926 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 1927 1928 void *InsertPos = 0; 1929 DependentTypeOfExprType *Canon 1930 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 1931 if (Canon) { 1932 // We already have a "canonical" version of an identical, dependent 1933 // typeof(expr) type. Use that as our canonical type. 1934 toe = new (*this, 8) TypeOfExprType(tofExpr, 1935 QualType((TypeOfExprType*)Canon, 0)); 1936 } 1937 else { 1938 // Build a new, canonical typeof(expr) type. 1939 Canon = new (*this, 8) DependentTypeOfExprType(*this, tofExpr); 1940 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 1941 toe = Canon; 1942 } 1943 } else { 1944 QualType Canonical = getCanonicalType(tofExpr->getType()); 1945 toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1946 } 1947 Types.push_back(toe); 1948 return QualType(toe, 0); 1949} 1950 1951/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1952/// TypeOfType AST's. The only motivation to unique these nodes would be 1953/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1954/// an issue. This doesn't effect the type checker, since it operates 1955/// on canonical type's (which are always unique). 1956QualType ASTContext::getTypeOfType(QualType tofType) { 1957 QualType Canonical = getCanonicalType(tofType); 1958 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1959 Types.push_back(tot); 1960 return QualType(tot, 0); 1961} 1962 1963/// getDecltypeForExpr - Given an expr, will return the decltype for that 1964/// expression, according to the rules in C++0x [dcl.type.simple]p4 1965static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 1966 if (e->isTypeDependent()) 1967 return Context.DependentTy; 1968 1969 // If e is an id expression or a class member access, decltype(e) is defined 1970 // as the type of the entity named by e. 1971 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 1972 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 1973 return VD->getType(); 1974 } 1975 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 1976 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1977 return FD->getType(); 1978 } 1979 // If e is a function call or an invocation of an overloaded operator, 1980 // (parentheses around e are ignored), decltype(e) is defined as the 1981 // return type of that function. 1982 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 1983 return CE->getCallReturnType(); 1984 1985 QualType T = e->getType(); 1986 1987 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 1988 // defined as T&, otherwise decltype(e) is defined as T. 1989 if (e->isLvalue(Context) == Expr::LV_Valid) 1990 T = Context.getLValueReferenceType(T); 1991 1992 return T; 1993} 1994 1995/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 1996/// DecltypeType AST's. The only motivation to unique these nodes would be 1997/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 1998/// an issue. This doesn't effect the type checker, since it operates 1999/// on canonical type's (which are always unique). 2000QualType ASTContext::getDecltypeType(Expr *e) { 2001 DecltypeType *dt; 2002 if (e->isTypeDependent()) { 2003 llvm::FoldingSetNodeID ID; 2004 DependentDecltypeType::Profile(ID, *this, e); 2005 2006 void *InsertPos = 0; 2007 DependentDecltypeType *Canon 2008 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2009 if (Canon) { 2010 // We already have a "canonical" version of an equivalent, dependent 2011 // decltype type. Use that as our canonical type. 2012 dt = new (*this, 8) DecltypeType(e, DependentTy, 2013 QualType((DecltypeType*)Canon, 0)); 2014 } 2015 else { 2016 // Build a new, canonical typeof(expr) type. 2017 Canon = new (*this, 8) DependentDecltypeType(*this, e); 2018 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2019 dt = Canon; 2020 } 2021 } else { 2022 QualType T = getDecltypeForExpr(e, *this); 2023 dt = new (*this, 8) DecltypeType(e, T, getCanonicalType(T)); 2024 } 2025 Types.push_back(dt); 2026 return QualType(dt, 0); 2027} 2028 2029/// getTagDeclType - Return the unique reference to the type for the 2030/// specified TagDecl (struct/union/class/enum) decl. 2031QualType ASTContext::getTagDeclType(TagDecl *Decl) { 2032 assert (Decl); 2033 return getTypeDeclType(Decl); 2034} 2035 2036/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2037/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2038/// needs to agree with the definition in <stddef.h>. 2039QualType ASTContext::getSizeType() const { 2040 return getFromTargetType(Target.getSizeType()); 2041} 2042 2043/// getSignedWCharType - Return the type of "signed wchar_t". 2044/// Used when in C++, as a GCC extension. 2045QualType ASTContext::getSignedWCharType() const { 2046 // FIXME: derive from "Target" ? 2047 return WCharTy; 2048} 2049 2050/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2051/// Used when in C++, as a GCC extension. 2052QualType ASTContext::getUnsignedWCharType() const { 2053 // FIXME: derive from "Target" ? 2054 return UnsignedIntTy; 2055} 2056 2057/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2058/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2059QualType ASTContext::getPointerDiffType() const { 2060 return getFromTargetType(Target.getPtrDiffType(0)); 2061} 2062 2063//===----------------------------------------------------------------------===// 2064// Type Operators 2065//===----------------------------------------------------------------------===// 2066 2067/// getCanonicalType - Return the canonical (structural) type corresponding to 2068/// the specified potentially non-canonical type. The non-canonical version 2069/// of a type may have many "decorated" versions of types. Decorators can 2070/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2071/// to be free of any of these, allowing two canonical types to be compared 2072/// for exact equality with a simple pointer comparison. 2073QualType ASTContext::getCanonicalType(QualType T) { 2074 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 2075 2076 // If the result has type qualifiers, make sure to canonicalize them as well. 2077 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 2078 if (TypeQuals == 0) return CanType; 2079 2080 // If the type qualifiers are on an array type, get the canonical type of the 2081 // array with the qualifiers applied to the element type. 2082 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2083 if (!AT) 2084 return CanType.getQualifiedType(TypeQuals); 2085 2086 // Get the canonical version of the element with the extra qualifiers on it. 2087 // This can recursively sink qualifiers through multiple levels of arrays. 2088 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 2089 NewEltTy = getCanonicalType(NewEltTy); 2090 2091 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2092 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 2093 CAT->getIndexTypeQualifier()); 2094 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2095 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2096 IAT->getIndexTypeQualifier()); 2097 2098 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2099 return getDependentSizedArrayType(NewEltTy, 2100 DSAT->getSizeExpr(), 2101 DSAT->getSizeModifier(), 2102 DSAT->getIndexTypeQualifier(), 2103 DSAT->getBracketsRange()); 2104 2105 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2106 return getVariableArrayType(NewEltTy, 2107 VAT->getSizeExpr(), 2108 VAT->getSizeModifier(), 2109 VAT->getIndexTypeQualifier(), 2110 VAT->getBracketsRange()); 2111} 2112 2113TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2114 // If this template name refers to a template, the canonical 2115 // template name merely stores the template itself. 2116 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2117 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2118 2119 // If this template name refers to a set of overloaded function templates, 2120 /// the canonical template name merely stores the set of function templates. 2121 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) 2122 // FIXME: Can't really canonicalize a set of overloaded functions, can we? 2123 return TemplateName(Ovl); 2124 2125 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2126 assert(DTN && "Non-dependent template names must refer to template decls."); 2127 return DTN->CanonicalTemplateName; 2128} 2129 2130TemplateArgument 2131ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2132 switch (Arg.getKind()) { 2133 case TemplateArgument::Null: 2134 return Arg; 2135 2136 case TemplateArgument::Expression: 2137 // FIXME: Build canonical expression? 2138 return Arg; 2139 2140 case TemplateArgument::Declaration: 2141 return TemplateArgument(SourceLocation(), 2142 Arg.getAsDecl()->getCanonicalDecl()); 2143 2144 case TemplateArgument::Integral: 2145 return TemplateArgument(SourceLocation(), 2146 *Arg.getAsIntegral(), 2147 getCanonicalType(Arg.getIntegralType())); 2148 2149 case TemplateArgument::Type: 2150 return TemplateArgument(SourceLocation(), 2151 getCanonicalType(Arg.getAsType())); 2152 2153 case TemplateArgument::Pack: { 2154 // FIXME: Allocate in ASTContext 2155 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2156 unsigned Idx = 0; 2157 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2158 AEnd = Arg.pack_end(); 2159 A != AEnd; (void)++A, ++Idx) 2160 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2161 2162 TemplateArgument Result; 2163 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2164 return Result; 2165 } 2166 } 2167 2168 // Silence GCC warning 2169 assert(false && "Unhandled template argument kind"); 2170 return TemplateArgument(); 2171} 2172 2173NestedNameSpecifier * 2174ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2175 if (!NNS) 2176 return 0; 2177 2178 switch (NNS->getKind()) { 2179 case NestedNameSpecifier::Identifier: 2180 // Canonicalize the prefix but keep the identifier the same. 2181 return NestedNameSpecifier::Create(*this, 2182 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2183 NNS->getAsIdentifier()); 2184 2185 case NestedNameSpecifier::Namespace: 2186 // A namespace is canonical; build a nested-name-specifier with 2187 // this namespace and no prefix. 2188 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2189 2190 case NestedNameSpecifier::TypeSpec: 2191 case NestedNameSpecifier::TypeSpecWithTemplate: { 2192 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2193 NestedNameSpecifier *Prefix = 0; 2194 2195 // FIXME: This isn't the right check! 2196 if (T->isDependentType()) 2197 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 2198 2199 return NestedNameSpecifier::Create(*this, Prefix, 2200 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2201 T.getTypePtr()); 2202 } 2203 2204 case NestedNameSpecifier::Global: 2205 // The global specifier is canonical and unique. 2206 return NNS; 2207 } 2208 2209 // Required to silence a GCC warning 2210 return 0; 2211} 2212 2213 2214const ArrayType *ASTContext::getAsArrayType(QualType T) { 2215 // Handle the non-qualified case efficiently. 2216 if (T.getCVRQualifiers() == 0) { 2217 // Handle the common positive case fast. 2218 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2219 return AT; 2220 } 2221 2222 // Handle the common negative case fast, ignoring CVR qualifiers. 2223 QualType CType = T->getCanonicalTypeInternal(); 2224 2225 // Make sure to look through type qualifiers (like ExtQuals) for the negative 2226 // test. 2227 if (!isa<ArrayType>(CType) && 2228 !isa<ArrayType>(CType.getUnqualifiedType())) 2229 return 0; 2230 2231 // Apply any CVR qualifiers from the array type to the element type. This 2232 // implements C99 6.7.3p8: "If the specification of an array type includes 2233 // any type qualifiers, the element type is so qualified, not the array type." 2234 2235 // If we get here, we either have type qualifiers on the type, or we have 2236 // sugar such as a typedef in the way. If we have type qualifiers on the type 2237 // we must propagate them down into the elemeng type. 2238 unsigned CVRQuals = T.getCVRQualifiers(); 2239 unsigned AddrSpace = 0; 2240 Type *Ty = T.getTypePtr(); 2241 2242 // Rip through ExtQualType's and typedefs to get to a concrete type. 2243 while (1) { 2244 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 2245 AddrSpace = EXTQT->getAddressSpace(); 2246 Ty = EXTQT->getBaseType(); 2247 } else { 2248 T = Ty->getDesugaredType(); 2249 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 2250 break; 2251 CVRQuals |= T.getCVRQualifiers(); 2252 Ty = T.getTypePtr(); 2253 } 2254 } 2255 2256 // If we have a simple case, just return now. 2257 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2258 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 2259 return ATy; 2260 2261 // Otherwise, we have an array and we have qualifiers on it. Push the 2262 // qualifiers into the array element type and return a new array type. 2263 // Get the canonical version of the element with the extra qualifiers on it. 2264 // This can recursively sink qualifiers through multiple levels of arrays. 2265 QualType NewEltTy = ATy->getElementType(); 2266 if (AddrSpace) 2267 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 2268 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 2269 2270 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2271 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2272 CAT->getSizeModifier(), 2273 CAT->getIndexTypeQualifier())); 2274 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2275 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2276 IAT->getSizeModifier(), 2277 IAT->getIndexTypeQualifier())); 2278 2279 if (const DependentSizedArrayType *DSAT 2280 = dyn_cast<DependentSizedArrayType>(ATy)) 2281 return cast<ArrayType>( 2282 getDependentSizedArrayType(NewEltTy, 2283 DSAT->getSizeExpr(), 2284 DSAT->getSizeModifier(), 2285 DSAT->getIndexTypeQualifier(), 2286 DSAT->getBracketsRange())); 2287 2288 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2289 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2290 VAT->getSizeExpr(), 2291 VAT->getSizeModifier(), 2292 VAT->getIndexTypeQualifier(), 2293 VAT->getBracketsRange())); 2294} 2295 2296 2297/// getArrayDecayedType - Return the properly qualified result of decaying the 2298/// specified array type to a pointer. This operation is non-trivial when 2299/// handling typedefs etc. The canonical type of "T" must be an array type, 2300/// this returns a pointer to a properly qualified element of the array. 2301/// 2302/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2303QualType ASTContext::getArrayDecayedType(QualType Ty) { 2304 // Get the element type with 'getAsArrayType' so that we don't lose any 2305 // typedefs in the element type of the array. This also handles propagation 2306 // of type qualifiers from the array type into the element type if present 2307 // (C99 6.7.3p8). 2308 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2309 assert(PrettyArrayType && "Not an array type!"); 2310 2311 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2312 2313 // int x[restrict 4] -> int *restrict 2314 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 2315} 2316 2317QualType ASTContext::getBaseElementType(QualType QT) { 2318 QualifierSet qualifiers; 2319 while (true) { 2320 const Type *UT = qualifiers.strip(QT); 2321 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2322 QT = AT->getElementType(); 2323 } else { 2324 return qualifiers.apply(QT, *this); 2325 } 2326 } 2327} 2328 2329QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 2330 QualType ElemTy = VAT->getElementType(); 2331 2332 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 2333 return getBaseElementType(VAT); 2334 2335 return ElemTy; 2336} 2337 2338/// getFloatingRank - Return a relative rank for floating point types. 2339/// This routine will assert if passed a built-in type that isn't a float. 2340static FloatingRank getFloatingRank(QualType T) { 2341 if (const ComplexType *CT = T->getAsComplexType()) 2342 return getFloatingRank(CT->getElementType()); 2343 2344 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 2345 switch (T->getAsBuiltinType()->getKind()) { 2346 default: assert(0 && "getFloatingRank(): not a floating type"); 2347 case BuiltinType::Float: return FloatRank; 2348 case BuiltinType::Double: return DoubleRank; 2349 case BuiltinType::LongDouble: return LongDoubleRank; 2350 } 2351} 2352 2353/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2354/// point or a complex type (based on typeDomain/typeSize). 2355/// 'typeDomain' is a real floating point or complex type. 2356/// 'typeSize' is a real floating point or complex type. 2357QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2358 QualType Domain) const { 2359 FloatingRank EltRank = getFloatingRank(Size); 2360 if (Domain->isComplexType()) { 2361 switch (EltRank) { 2362 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2363 case FloatRank: return FloatComplexTy; 2364 case DoubleRank: return DoubleComplexTy; 2365 case LongDoubleRank: return LongDoubleComplexTy; 2366 } 2367 } 2368 2369 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2370 switch (EltRank) { 2371 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2372 case FloatRank: return FloatTy; 2373 case DoubleRank: return DoubleTy; 2374 case LongDoubleRank: return LongDoubleTy; 2375 } 2376} 2377 2378/// getFloatingTypeOrder - Compare the rank of the two specified floating 2379/// point types, ignoring the domain of the type (i.e. 'double' == 2380/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2381/// LHS < RHS, return -1. 2382int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2383 FloatingRank LHSR = getFloatingRank(LHS); 2384 FloatingRank RHSR = getFloatingRank(RHS); 2385 2386 if (LHSR == RHSR) 2387 return 0; 2388 if (LHSR > RHSR) 2389 return 1; 2390 return -1; 2391} 2392 2393/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2394/// routine will assert if passed a built-in type that isn't an integer or enum, 2395/// or if it is not canonicalized. 2396unsigned ASTContext::getIntegerRank(Type *T) { 2397 assert(T->isCanonical() && "T should be canonicalized"); 2398 if (EnumType* ET = dyn_cast<EnumType>(T)) 2399 T = ET->getDecl()->getIntegerType().getTypePtr(); 2400 2401 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2402 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2403 2404 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2405 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2406 2407 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2408 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2409 2410 // There are two things which impact the integer rank: the width, and 2411 // the ordering of builtins. The builtin ordering is encoded in the 2412 // bottom three bits; the width is encoded in the bits above that. 2413 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2414 return FWIT->getWidth() << 3; 2415 2416 switch (cast<BuiltinType>(T)->getKind()) { 2417 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2418 case BuiltinType::Bool: 2419 return 1 + (getIntWidth(BoolTy) << 3); 2420 case BuiltinType::Char_S: 2421 case BuiltinType::Char_U: 2422 case BuiltinType::SChar: 2423 case BuiltinType::UChar: 2424 return 2 + (getIntWidth(CharTy) << 3); 2425 case BuiltinType::Short: 2426 case BuiltinType::UShort: 2427 return 3 + (getIntWidth(ShortTy) << 3); 2428 case BuiltinType::Int: 2429 case BuiltinType::UInt: 2430 return 4 + (getIntWidth(IntTy) << 3); 2431 case BuiltinType::Long: 2432 case BuiltinType::ULong: 2433 return 5 + (getIntWidth(LongTy) << 3); 2434 case BuiltinType::LongLong: 2435 case BuiltinType::ULongLong: 2436 return 6 + (getIntWidth(LongLongTy) << 3); 2437 case BuiltinType::Int128: 2438 case BuiltinType::UInt128: 2439 return 7 + (getIntWidth(Int128Ty) << 3); 2440 } 2441} 2442 2443/// getIntegerTypeOrder - Returns the highest ranked integer type: 2444/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2445/// LHS < RHS, return -1. 2446int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2447 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2448 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2449 if (LHSC == RHSC) return 0; 2450 2451 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2452 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2453 2454 unsigned LHSRank = getIntegerRank(LHSC); 2455 unsigned RHSRank = getIntegerRank(RHSC); 2456 2457 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2458 if (LHSRank == RHSRank) return 0; 2459 return LHSRank > RHSRank ? 1 : -1; 2460 } 2461 2462 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2463 if (LHSUnsigned) { 2464 // If the unsigned [LHS] type is larger, return it. 2465 if (LHSRank >= RHSRank) 2466 return 1; 2467 2468 // If the signed type can represent all values of the unsigned type, it 2469 // wins. Because we are dealing with 2's complement and types that are 2470 // powers of two larger than each other, this is always safe. 2471 return -1; 2472 } 2473 2474 // If the unsigned [RHS] type is larger, return it. 2475 if (RHSRank >= LHSRank) 2476 return -1; 2477 2478 // If the signed type can represent all values of the unsigned type, it 2479 // wins. Because we are dealing with 2's complement and types that are 2480 // powers of two larger than each other, this is always safe. 2481 return 1; 2482} 2483 2484// getCFConstantStringType - Return the type used for constant CFStrings. 2485QualType ASTContext::getCFConstantStringType() { 2486 if (!CFConstantStringTypeDecl) { 2487 CFConstantStringTypeDecl = 2488 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2489 &Idents.get("NSConstantString")); 2490 QualType FieldTypes[4]; 2491 2492 // const int *isa; 2493 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2494 // int flags; 2495 FieldTypes[1] = IntTy; 2496 // const char *str; 2497 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2498 // long length; 2499 FieldTypes[3] = LongTy; 2500 2501 // Create fields 2502 for (unsigned i = 0; i < 4; ++i) { 2503 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2504 SourceLocation(), 0, 2505 FieldTypes[i], /*BitWidth=*/0, 2506 /*Mutable=*/false); 2507 CFConstantStringTypeDecl->addDecl(Field); 2508 } 2509 2510 CFConstantStringTypeDecl->completeDefinition(*this); 2511 } 2512 2513 return getTagDeclType(CFConstantStringTypeDecl); 2514} 2515 2516void ASTContext::setCFConstantStringType(QualType T) { 2517 const RecordType *Rec = T->getAs<RecordType>(); 2518 assert(Rec && "Invalid CFConstantStringType"); 2519 CFConstantStringTypeDecl = Rec->getDecl(); 2520} 2521 2522QualType ASTContext::getObjCFastEnumerationStateType() 2523{ 2524 if (!ObjCFastEnumerationStateTypeDecl) { 2525 ObjCFastEnumerationStateTypeDecl = 2526 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2527 &Idents.get("__objcFastEnumerationState")); 2528 2529 QualType FieldTypes[] = { 2530 UnsignedLongTy, 2531 getPointerType(ObjCIdTypedefType), 2532 getPointerType(UnsignedLongTy), 2533 getConstantArrayType(UnsignedLongTy, 2534 llvm::APInt(32, 5), ArrayType::Normal, 0) 2535 }; 2536 2537 for (size_t i = 0; i < 4; ++i) { 2538 FieldDecl *Field = FieldDecl::Create(*this, 2539 ObjCFastEnumerationStateTypeDecl, 2540 SourceLocation(), 0, 2541 FieldTypes[i], /*BitWidth=*/0, 2542 /*Mutable=*/false); 2543 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2544 } 2545 2546 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2547 } 2548 2549 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2550} 2551 2552void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2553 const RecordType *Rec = T->getAs<RecordType>(); 2554 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2555 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2556} 2557 2558// This returns true if a type has been typedefed to BOOL: 2559// typedef <type> BOOL; 2560static bool isTypeTypedefedAsBOOL(QualType T) { 2561 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2562 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2563 return II->isStr("BOOL"); 2564 2565 return false; 2566} 2567 2568/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2569/// purpose. 2570int ASTContext::getObjCEncodingTypeSize(QualType type) { 2571 uint64_t sz = getTypeSize(type); 2572 2573 // Make all integer and enum types at least as large as an int 2574 if (sz > 0 && type->isIntegralType()) 2575 sz = std::max(sz, getTypeSize(IntTy)); 2576 // Treat arrays as pointers, since that's how they're passed in. 2577 else if (type->isArrayType()) 2578 sz = getTypeSize(VoidPtrTy); 2579 return sz / getTypeSize(CharTy); 2580} 2581 2582/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2583/// declaration. 2584void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2585 std::string& S) { 2586 // FIXME: This is not very efficient. 2587 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2588 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2589 // Encode result type. 2590 getObjCEncodingForType(Decl->getResultType(), S); 2591 // Compute size of all parameters. 2592 // Start with computing size of a pointer in number of bytes. 2593 // FIXME: There might(should) be a better way of doing this computation! 2594 SourceLocation Loc; 2595 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2596 // The first two arguments (self and _cmd) are pointers; account for 2597 // their size. 2598 int ParmOffset = 2 * PtrSize; 2599 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2600 E = Decl->param_end(); PI != E; ++PI) { 2601 QualType PType = (*PI)->getType(); 2602 int sz = getObjCEncodingTypeSize(PType); 2603 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2604 ParmOffset += sz; 2605 } 2606 S += llvm::utostr(ParmOffset); 2607 S += "@0:"; 2608 S += llvm::utostr(PtrSize); 2609 2610 // Argument types. 2611 ParmOffset = 2 * PtrSize; 2612 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2613 E = Decl->param_end(); PI != E; ++PI) { 2614 ParmVarDecl *PVDecl = *PI; 2615 QualType PType = PVDecl->getOriginalType(); 2616 if (const ArrayType *AT = 2617 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2618 // Use array's original type only if it has known number of 2619 // elements. 2620 if (!isa<ConstantArrayType>(AT)) 2621 PType = PVDecl->getType(); 2622 } else if (PType->isFunctionType()) 2623 PType = PVDecl->getType(); 2624 // Process argument qualifiers for user supplied arguments; such as, 2625 // 'in', 'inout', etc. 2626 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2627 getObjCEncodingForType(PType, S); 2628 S += llvm::utostr(ParmOffset); 2629 ParmOffset += getObjCEncodingTypeSize(PType); 2630 } 2631} 2632 2633/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2634/// property declaration. If non-NULL, Container must be either an 2635/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2636/// NULL when getting encodings for protocol properties. 2637/// Property attributes are stored as a comma-delimited C string. The simple 2638/// attributes readonly and bycopy are encoded as single characters. The 2639/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2640/// encoded as single characters, followed by an identifier. Property types 2641/// are also encoded as a parametrized attribute. The characters used to encode 2642/// these attributes are defined by the following enumeration: 2643/// @code 2644/// enum PropertyAttributes { 2645/// kPropertyReadOnly = 'R', // property is read-only. 2646/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2647/// kPropertyByref = '&', // property is a reference to the value last assigned 2648/// kPropertyDynamic = 'D', // property is dynamic 2649/// kPropertyGetter = 'G', // followed by getter selector name 2650/// kPropertySetter = 'S', // followed by setter selector name 2651/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2652/// kPropertyType = 't' // followed by old-style type encoding. 2653/// kPropertyWeak = 'W' // 'weak' property 2654/// kPropertyStrong = 'P' // property GC'able 2655/// kPropertyNonAtomic = 'N' // property non-atomic 2656/// }; 2657/// @endcode 2658void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2659 const Decl *Container, 2660 std::string& S) { 2661 // Collect information from the property implementation decl(s). 2662 bool Dynamic = false; 2663 ObjCPropertyImplDecl *SynthesizePID = 0; 2664 2665 // FIXME: Duplicated code due to poor abstraction. 2666 if (Container) { 2667 if (const ObjCCategoryImplDecl *CID = 2668 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2669 for (ObjCCategoryImplDecl::propimpl_iterator 2670 i = CID->propimpl_begin(), e = CID->propimpl_end(); 2671 i != e; ++i) { 2672 ObjCPropertyImplDecl *PID = *i; 2673 if (PID->getPropertyDecl() == PD) { 2674 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2675 Dynamic = true; 2676 } else { 2677 SynthesizePID = PID; 2678 } 2679 } 2680 } 2681 } else { 2682 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2683 for (ObjCCategoryImplDecl::propimpl_iterator 2684 i = OID->propimpl_begin(), e = OID->propimpl_end(); 2685 i != e; ++i) { 2686 ObjCPropertyImplDecl *PID = *i; 2687 if (PID->getPropertyDecl() == PD) { 2688 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2689 Dynamic = true; 2690 } else { 2691 SynthesizePID = PID; 2692 } 2693 } 2694 } 2695 } 2696 } 2697 2698 // FIXME: This is not very efficient. 2699 S = "T"; 2700 2701 // Encode result type. 2702 // GCC has some special rules regarding encoding of properties which 2703 // closely resembles encoding of ivars. 2704 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2705 true /* outermost type */, 2706 true /* encoding for property */); 2707 2708 if (PD->isReadOnly()) { 2709 S += ",R"; 2710 } else { 2711 switch (PD->getSetterKind()) { 2712 case ObjCPropertyDecl::Assign: break; 2713 case ObjCPropertyDecl::Copy: S += ",C"; break; 2714 case ObjCPropertyDecl::Retain: S += ",&"; break; 2715 } 2716 } 2717 2718 // It really isn't clear at all what this means, since properties 2719 // are "dynamic by default". 2720 if (Dynamic) 2721 S += ",D"; 2722 2723 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2724 S += ",N"; 2725 2726 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2727 S += ",G"; 2728 S += PD->getGetterName().getAsString(); 2729 } 2730 2731 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2732 S += ",S"; 2733 S += PD->getSetterName().getAsString(); 2734 } 2735 2736 if (SynthesizePID) { 2737 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2738 S += ",V"; 2739 S += OID->getNameAsString(); 2740 } 2741 2742 // FIXME: OBJCGC: weak & strong 2743} 2744 2745/// getLegacyIntegralTypeEncoding - 2746/// Another legacy compatibility encoding: 32-bit longs are encoded as 2747/// 'l' or 'L' , but not always. For typedefs, we need to use 2748/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2749/// 2750void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2751 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 2752 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2753 if (BT->getKind() == BuiltinType::ULong && 2754 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2755 PointeeTy = UnsignedIntTy; 2756 else 2757 if (BT->getKind() == BuiltinType::Long && 2758 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2759 PointeeTy = IntTy; 2760 } 2761 } 2762} 2763 2764void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2765 const FieldDecl *Field) { 2766 // We follow the behavior of gcc, expanding structures which are 2767 // directly pointed to, and expanding embedded structures. Note that 2768 // these rules are sufficient to prevent recursive encoding of the 2769 // same type. 2770 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2771 true /* outermost type */); 2772} 2773 2774static void EncodeBitField(const ASTContext *Context, std::string& S, 2775 const FieldDecl *FD) { 2776 const Expr *E = FD->getBitWidth(); 2777 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2778 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2779 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2780 S += 'b'; 2781 S += llvm::utostr(N); 2782} 2783 2784void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2785 bool ExpandPointedToStructures, 2786 bool ExpandStructures, 2787 const FieldDecl *FD, 2788 bool OutermostType, 2789 bool EncodingProperty) { 2790 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2791 if (FD && FD->isBitField()) 2792 return EncodeBitField(this, S, FD); 2793 char encoding; 2794 switch (BT->getKind()) { 2795 default: assert(0 && "Unhandled builtin type kind"); 2796 case BuiltinType::Void: encoding = 'v'; break; 2797 case BuiltinType::Bool: encoding = 'B'; break; 2798 case BuiltinType::Char_U: 2799 case BuiltinType::UChar: encoding = 'C'; break; 2800 case BuiltinType::UShort: encoding = 'S'; break; 2801 case BuiltinType::UInt: encoding = 'I'; break; 2802 case BuiltinType::ULong: 2803 encoding = 2804 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2805 break; 2806 case BuiltinType::UInt128: encoding = 'T'; break; 2807 case BuiltinType::ULongLong: encoding = 'Q'; break; 2808 case BuiltinType::Char_S: 2809 case BuiltinType::SChar: encoding = 'c'; break; 2810 case BuiltinType::Short: encoding = 's'; break; 2811 case BuiltinType::Int: encoding = 'i'; break; 2812 case BuiltinType::Long: 2813 encoding = 2814 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2815 break; 2816 case BuiltinType::LongLong: encoding = 'q'; break; 2817 case BuiltinType::Int128: encoding = 't'; break; 2818 case BuiltinType::Float: encoding = 'f'; break; 2819 case BuiltinType::Double: encoding = 'd'; break; 2820 case BuiltinType::LongDouble: encoding = 'd'; break; 2821 } 2822 2823 S += encoding; 2824 return; 2825 } 2826 2827 if (const ComplexType *CT = T->getAsComplexType()) { 2828 S += 'j'; 2829 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2830 false); 2831 return; 2832 } 2833 2834 if (const PointerType *PT = T->getAs<PointerType>()) { 2835 QualType PointeeTy = PT->getPointeeType(); 2836 bool isReadOnly = false; 2837 // For historical/compatibility reasons, the read-only qualifier of the 2838 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2839 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2840 // Also, do not emit the 'r' for anything but the outermost type! 2841 if (isa<TypedefType>(T.getTypePtr())) { 2842 if (OutermostType && T.isConstQualified()) { 2843 isReadOnly = true; 2844 S += 'r'; 2845 } 2846 } else if (OutermostType) { 2847 QualType P = PointeeTy; 2848 while (P->getAs<PointerType>()) 2849 P = P->getAs<PointerType>()->getPointeeType(); 2850 if (P.isConstQualified()) { 2851 isReadOnly = true; 2852 S += 'r'; 2853 } 2854 } 2855 if (isReadOnly) { 2856 // Another legacy compatibility encoding. Some ObjC qualifier and type 2857 // combinations need to be rearranged. 2858 // Rewrite "in const" from "nr" to "rn" 2859 const char * s = S.c_str(); 2860 int len = S.length(); 2861 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2862 std::string replace = "rn"; 2863 S.replace(S.end()-2, S.end(), replace); 2864 } 2865 } 2866 if (isObjCSelType(PointeeTy)) { 2867 S += ':'; 2868 return; 2869 } 2870 2871 if (PointeeTy->isCharType()) { 2872 // char pointer types should be encoded as '*' unless it is a 2873 // type that has been typedef'd to 'BOOL'. 2874 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2875 S += '*'; 2876 return; 2877 } 2878 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 2879 // GCC binary compat: Need to convert "struct objc_class *" to "#". 2880 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 2881 S += '#'; 2882 return; 2883 } 2884 // GCC binary compat: Need to convert "struct objc_object *" to "@". 2885 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 2886 S += '@'; 2887 return; 2888 } 2889 // fall through... 2890 } 2891 S += '^'; 2892 getLegacyIntegralTypeEncoding(PointeeTy); 2893 2894 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 2895 NULL); 2896 return; 2897 } 2898 2899 if (const ArrayType *AT = 2900 // Ignore type qualifiers etc. 2901 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2902 if (isa<IncompleteArrayType>(AT)) { 2903 // Incomplete arrays are encoded as a pointer to the array element. 2904 S += '^'; 2905 2906 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2907 false, ExpandStructures, FD); 2908 } else { 2909 S += '['; 2910 2911 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2912 S += llvm::utostr(CAT->getSize().getZExtValue()); 2913 else { 2914 //Variable length arrays are encoded as a regular array with 0 elements. 2915 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2916 S += '0'; 2917 } 2918 2919 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2920 false, ExpandStructures, FD); 2921 S += ']'; 2922 } 2923 return; 2924 } 2925 2926 if (T->getAsFunctionType()) { 2927 S += '?'; 2928 return; 2929 } 2930 2931 if (const RecordType *RTy = T->getAs<RecordType>()) { 2932 RecordDecl *RDecl = RTy->getDecl(); 2933 S += RDecl->isUnion() ? '(' : '{'; 2934 // Anonymous structures print as '?' 2935 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2936 S += II->getName(); 2937 } else { 2938 S += '?'; 2939 } 2940 if (ExpandStructures) { 2941 S += '='; 2942 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 2943 FieldEnd = RDecl->field_end(); 2944 Field != FieldEnd; ++Field) { 2945 if (FD) { 2946 S += '"'; 2947 S += Field->getNameAsString(); 2948 S += '"'; 2949 } 2950 2951 // Special case bit-fields. 2952 if (Field->isBitField()) { 2953 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2954 (*Field)); 2955 } else { 2956 QualType qt = Field->getType(); 2957 getLegacyIntegralTypeEncoding(qt); 2958 getObjCEncodingForTypeImpl(qt, S, false, true, 2959 FD); 2960 } 2961 } 2962 } 2963 S += RDecl->isUnion() ? ')' : '}'; 2964 return; 2965 } 2966 2967 if (T->isEnumeralType()) { 2968 if (FD && FD->isBitField()) 2969 EncodeBitField(this, S, FD); 2970 else 2971 S += 'i'; 2972 return; 2973 } 2974 2975 if (T->isBlockPointerType()) { 2976 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2977 return; 2978 } 2979 2980 if (T->isObjCInterfaceType()) { 2981 // @encode(class_name) 2982 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 2983 S += '{'; 2984 const IdentifierInfo *II = OI->getIdentifier(); 2985 S += II->getName(); 2986 S += '='; 2987 llvm::SmallVector<FieldDecl*, 32> RecFields; 2988 CollectObjCIvars(OI, RecFields); 2989 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2990 if (RecFields[i]->isBitField()) 2991 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2992 RecFields[i]); 2993 else 2994 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2995 FD); 2996 } 2997 S += '}'; 2998 return; 2999 } 3000 3001 if (const ObjCObjectPointerType *OPT = T->getAsObjCObjectPointerType()) { 3002 if (OPT->isObjCIdType()) { 3003 S += '@'; 3004 return; 3005 } 3006 3007 if (OPT->isObjCClassType()) { 3008 S += '#'; 3009 return; 3010 } 3011 3012 if (OPT->isObjCQualifiedIdType()) { 3013 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3014 ExpandPointedToStructures, 3015 ExpandStructures, FD); 3016 if (FD || EncodingProperty) { 3017 // Note that we do extended encoding of protocol qualifer list 3018 // Only when doing ivar or property encoding. 3019 S += '"'; 3020 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3021 E = OPT->qual_end(); I != E; ++I) { 3022 S += '<'; 3023 S += (*I)->getNameAsString(); 3024 S += '>'; 3025 } 3026 S += '"'; 3027 } 3028 return; 3029 } 3030 3031 QualType PointeeTy = OPT->getPointeeType(); 3032 if (!EncodingProperty && 3033 isa<TypedefType>(PointeeTy.getTypePtr())) { 3034 // Another historical/compatibility reason. 3035 // We encode the underlying type which comes out as 3036 // {...}; 3037 S += '^'; 3038 getObjCEncodingForTypeImpl(PointeeTy, S, 3039 false, ExpandPointedToStructures, 3040 NULL); 3041 return; 3042 } 3043 3044 S += '@'; 3045 if (FD || EncodingProperty) { 3046 S += '"'; 3047 S += OPT->getInterfaceDecl()->getNameAsCString(); 3048 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3049 E = OPT->qual_end(); I != E; ++I) { 3050 S += '<'; 3051 S += (*I)->getNameAsString(); 3052 S += '>'; 3053 } 3054 S += '"'; 3055 } 3056 return; 3057 } 3058 3059 assert(0 && "@encode for type not implemented!"); 3060} 3061 3062void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3063 std::string& S) const { 3064 if (QT & Decl::OBJC_TQ_In) 3065 S += 'n'; 3066 if (QT & Decl::OBJC_TQ_Inout) 3067 S += 'N'; 3068 if (QT & Decl::OBJC_TQ_Out) 3069 S += 'o'; 3070 if (QT & Decl::OBJC_TQ_Bycopy) 3071 S += 'O'; 3072 if (QT & Decl::OBJC_TQ_Byref) 3073 S += 'R'; 3074 if (QT & Decl::OBJC_TQ_Oneway) 3075 S += 'V'; 3076} 3077 3078void ASTContext::setBuiltinVaListType(QualType T) { 3079 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3080 3081 BuiltinVaListType = T; 3082} 3083 3084void ASTContext::setObjCIdType(QualType T) { 3085 ObjCIdTypedefType = T; 3086} 3087 3088void ASTContext::setObjCSelType(QualType T) { 3089 ObjCSelType = T; 3090 3091 const TypedefType *TT = T->getAsTypedefType(); 3092 if (!TT) 3093 return; 3094 TypedefDecl *TD = TT->getDecl(); 3095 3096 // typedef struct objc_selector *SEL; 3097 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3098 if (!ptr) 3099 return; 3100 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3101 if (!rec) 3102 return; 3103 SelStructType = rec; 3104} 3105 3106void ASTContext::setObjCProtoType(QualType QT) { 3107 ObjCProtoType = QT; 3108} 3109 3110void ASTContext::setObjCClassType(QualType T) { 3111 ObjCClassTypedefType = T; 3112} 3113 3114void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3115 assert(ObjCConstantStringType.isNull() && 3116 "'NSConstantString' type already set!"); 3117 3118 ObjCConstantStringType = getObjCInterfaceType(Decl); 3119} 3120 3121/// \brief Retrieve the template name that represents a qualified 3122/// template name such as \c std::vector. 3123TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3124 bool TemplateKeyword, 3125 TemplateDecl *Template) { 3126 llvm::FoldingSetNodeID ID; 3127 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3128 3129 void *InsertPos = 0; 3130 QualifiedTemplateName *QTN = 3131 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3132 if (!QTN) { 3133 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3134 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3135 } 3136 3137 return TemplateName(QTN); 3138} 3139 3140/// \brief Retrieve the template name that represents a qualified 3141/// template name such as \c std::vector. 3142TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3143 bool TemplateKeyword, 3144 OverloadedFunctionDecl *Template) { 3145 llvm::FoldingSetNodeID ID; 3146 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3147 3148 void *InsertPos = 0; 3149 QualifiedTemplateName *QTN = 3150 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3151 if (!QTN) { 3152 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3153 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3154 } 3155 3156 return TemplateName(QTN); 3157} 3158 3159/// \brief Retrieve the template name that represents a dependent 3160/// template name such as \c MetaFun::template apply. 3161TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3162 const IdentifierInfo *Name) { 3163 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 3164 3165 llvm::FoldingSetNodeID ID; 3166 DependentTemplateName::Profile(ID, NNS, Name); 3167 3168 void *InsertPos = 0; 3169 DependentTemplateName *QTN = 3170 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3171 3172 if (QTN) 3173 return TemplateName(QTN); 3174 3175 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3176 if (CanonNNS == NNS) { 3177 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3178 } else { 3179 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3180 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3181 } 3182 3183 DependentTemplateNames.InsertNode(QTN, InsertPos); 3184 return TemplateName(QTN); 3185} 3186 3187/// getFromTargetType - Given one of the integer types provided by 3188/// TargetInfo, produce the corresponding type. The unsigned @p Type 3189/// is actually a value of type @c TargetInfo::IntType. 3190QualType ASTContext::getFromTargetType(unsigned Type) const { 3191 switch (Type) { 3192 case TargetInfo::NoInt: return QualType(); 3193 case TargetInfo::SignedShort: return ShortTy; 3194 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3195 case TargetInfo::SignedInt: return IntTy; 3196 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3197 case TargetInfo::SignedLong: return LongTy; 3198 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3199 case TargetInfo::SignedLongLong: return LongLongTy; 3200 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3201 } 3202 3203 assert(false && "Unhandled TargetInfo::IntType value"); 3204 return QualType(); 3205} 3206 3207//===----------------------------------------------------------------------===// 3208// Type Predicates. 3209//===----------------------------------------------------------------------===// 3210 3211/// isObjCNSObjectType - Return true if this is an NSObject object using 3212/// NSObject attribute on a c-style pointer type. 3213/// FIXME - Make it work directly on types. 3214/// FIXME: Move to Type. 3215/// 3216bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3217 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3218 if (TypedefDecl *TD = TDT->getDecl()) 3219 if (TD->getAttr<ObjCNSObjectAttr>()) 3220 return true; 3221 } 3222 return false; 3223} 3224 3225/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3226/// garbage collection attribute. 3227/// 3228QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3229 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 3230 if (getLangOptions().ObjC1 && 3231 getLangOptions().getGCMode() != LangOptions::NonGC) { 3232 GCAttrs = Ty.getObjCGCAttr(); 3233 // Default behavious under objective-c's gc is for objective-c pointers 3234 // (or pointers to them) be treated as though they were declared 3235 // as __strong. 3236 if (GCAttrs == QualType::GCNone) { 3237 if (Ty->isObjCObjectPointerType()) 3238 GCAttrs = QualType::Strong; 3239 else if (Ty->isPointerType()) 3240 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3241 } 3242 // Non-pointers have none gc'able attribute regardless of the attribute 3243 // set on them. 3244 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3245 return QualType::GCNone; 3246 } 3247 return GCAttrs; 3248} 3249 3250//===----------------------------------------------------------------------===// 3251// Type Compatibility Testing 3252//===----------------------------------------------------------------------===// 3253 3254/// areCompatVectorTypes - Return true if the two specified vector types are 3255/// compatible. 3256static bool areCompatVectorTypes(const VectorType *LHS, 3257 const VectorType *RHS) { 3258 assert(LHS->isCanonical() && RHS->isCanonical()); 3259 return LHS->getElementType() == RHS->getElementType() && 3260 LHS->getNumElements() == RHS->getNumElements(); 3261} 3262 3263//===----------------------------------------------------------------------===// 3264// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3265//===----------------------------------------------------------------------===// 3266 3267/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3268/// inheritance hierarchy of 'rProto'. 3269static bool ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3270 ObjCProtocolDecl *rProto) { 3271 if (lProto == rProto) 3272 return true; 3273 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3274 E = rProto->protocol_end(); PI != E; ++PI) 3275 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3276 return true; 3277 return false; 3278} 3279 3280/// ClassImplementsProtocol - Checks that 'lProto' protocol 3281/// has been implemented in IDecl class, its super class or categories (if 3282/// lookupCategory is true). 3283static bool ClassImplementsProtocol(ObjCProtocolDecl *lProto, 3284 ObjCInterfaceDecl *IDecl, 3285 bool lookupCategory, 3286 bool RHSIsQualifiedID = false) { 3287 3288 // 1st, look up the class. 3289 const ObjCList<ObjCProtocolDecl> &Protocols = 3290 IDecl->getReferencedProtocols(); 3291 3292 for (ObjCList<ObjCProtocolDecl>::iterator PI = Protocols.begin(), 3293 E = Protocols.end(); PI != E; ++PI) { 3294 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3295 return true; 3296 // This is dubious and is added to be compatible with gcc. In gcc, it is 3297 // also allowed assigning a protocol-qualified 'id' type to a LHS object 3298 // when protocol in qualified LHS is in list of protocols in the rhs 'id' 3299 // object. This IMO, should be a bug. 3300 // FIXME: Treat this as an extension, and flag this as an error when GCC 3301 // extensions are not enabled. 3302 if (RHSIsQualifiedID && ProtocolCompatibleWithProtocol(*PI, lProto)) 3303 return true; 3304 } 3305 3306 // 2nd, look up the category. 3307 if (lookupCategory) 3308 for (ObjCCategoryDecl *CDecl = IDecl->getCategoryList(); CDecl; 3309 CDecl = CDecl->getNextClassCategory()) { 3310 for (ObjCCategoryDecl::protocol_iterator PI = CDecl->protocol_begin(), 3311 E = CDecl->protocol_end(); PI != E; ++PI) 3312 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3313 return true; 3314 } 3315 3316 // 3rd, look up the super class(s) 3317 if (IDecl->getSuperClass()) 3318 return 3319 ClassImplementsProtocol(lProto, IDecl->getSuperClass(), lookupCategory, 3320 RHSIsQualifiedID); 3321 3322 return false; 3323} 3324 3325/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3326/// return true if lhs's protocols conform to rhs's protocol; false 3327/// otherwise. 3328bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3329 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3330 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3331 return false; 3332} 3333 3334/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3335/// ObjCQualifiedIDType. 3336bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3337 bool compare) { 3338 // Allow id<P..> and an 'id' or void* type in all cases. 3339 if (lhs->isVoidPointerType() || 3340 lhs->isObjCIdType() || lhs->isObjCClassType()) 3341 return true; 3342 else if (rhs->isVoidPointerType() || 3343 rhs->isObjCIdType() || rhs->isObjCClassType()) 3344 return true; 3345 3346 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3347 const ObjCObjectPointerType *rhsOPT = rhs->getAsObjCObjectPointerType(); 3348 3349 if (!rhsOPT) return false; 3350 3351 if (rhsOPT->qual_empty()) { 3352 // If the RHS is a unqualified interface pointer "NSString*", 3353 // make sure we check the class hierarchy. 3354 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3355 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3356 E = lhsQID->qual_end(); I != E; ++I) { 3357 // when comparing an id<P> on lhs with a static type on rhs, 3358 // see if static class implements all of id's protocols, directly or 3359 // through its super class and categories. 3360 if (!ClassImplementsProtocol(*I, rhsID, true)) 3361 return false; 3362 } 3363 } 3364 // If there are no qualifiers and no interface, we have an 'id'. 3365 return true; 3366 } 3367 // Both the right and left sides have qualifiers. 3368 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3369 E = lhsQID->qual_end(); I != E; ++I) { 3370 ObjCProtocolDecl *lhsProto = *I; 3371 bool match = false; 3372 3373 // when comparing an id<P> on lhs with a static type on rhs, 3374 // see if static class implements all of id's protocols, directly or 3375 // through its super class and categories. 3376 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3377 E = rhsOPT->qual_end(); J != E; ++J) { 3378 ObjCProtocolDecl *rhsProto = *J; 3379 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3380 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3381 match = true; 3382 break; 3383 } 3384 } 3385 // If the RHS is a qualified interface pointer "NSString<P>*", 3386 // make sure we check the class hierarchy. 3387 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3388 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3389 E = lhsQID->qual_end(); I != E; ++I) { 3390 // when comparing an id<P> on lhs with a static type on rhs, 3391 // see if static class implements all of id's protocols, directly or 3392 // through its super class and categories. 3393 if (ClassImplementsProtocol(*I, rhsID, true)) { 3394 match = true; 3395 break; 3396 } 3397 } 3398 } 3399 if (!match) 3400 return false; 3401 } 3402 3403 return true; 3404 } 3405 3406 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3407 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3408 3409 if (const ObjCObjectPointerType *lhsOPT = 3410 lhs->getAsObjCInterfacePointerType()) { 3411 if (lhsOPT->qual_empty()) { 3412 bool match = false; 3413 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3414 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3415 E = rhsQID->qual_end(); I != E; ++I) { 3416 // when comparing an id<P> on lhs with a static type on rhs, 3417 // see if static class implements all of id's protocols, directly or 3418 // through its super class and categories. 3419 if (ClassImplementsProtocol(*I, lhsID, true)) { 3420 match = true; 3421 break; 3422 } 3423 } 3424 if (!match) 3425 return false; 3426 } 3427 return true; 3428 } 3429 // Both the right and left sides have qualifiers. 3430 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3431 E = lhsOPT->qual_end(); I != E; ++I) { 3432 ObjCProtocolDecl *lhsProto = *I; 3433 bool match = false; 3434 3435 // when comparing an id<P> on lhs with a static type on rhs, 3436 // see if static class implements all of id's protocols, directly or 3437 // through its super class and categories. 3438 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3439 E = rhsQID->qual_end(); J != E; ++J) { 3440 ObjCProtocolDecl *rhsProto = *J; 3441 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3442 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3443 match = true; 3444 break; 3445 } 3446 } 3447 if (!match) 3448 return false; 3449 } 3450 return true; 3451 } 3452 return false; 3453} 3454 3455/// canAssignObjCInterfaces - Return true if the two interface types are 3456/// compatible for assignment from RHS to LHS. This handles validation of any 3457/// protocol qualifiers on the LHS or RHS. 3458/// 3459bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3460 const ObjCObjectPointerType *RHSOPT) { 3461 // If either type represents the built-in 'id' or 'Class' types, return true. 3462 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3463 return true; 3464 3465 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3466 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3467 QualType(RHSOPT,0), 3468 false); 3469 3470 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3471 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3472 if (LHS && RHS) // We have 2 user-defined types. 3473 return canAssignObjCInterfaces(LHS, RHS); 3474 3475 return false; 3476} 3477 3478bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3479 const ObjCInterfaceType *RHS) { 3480 // Verify that the base decls are compatible: the RHS must be a subclass of 3481 // the LHS. 3482 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3483 return false; 3484 3485 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3486 // protocol qualified at all, then we are good. 3487 if (LHS->getNumProtocols() == 0) 3488 return true; 3489 3490 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3491 // isn't a superset. 3492 if (RHS->getNumProtocols() == 0) 3493 return true; // FIXME: should return false! 3494 3495 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3496 LHSPE = LHS->qual_end(); 3497 LHSPI != LHSPE; LHSPI++) { 3498 bool RHSImplementsProtocol = false; 3499 3500 // If the RHS doesn't implement the protocol on the left, the types 3501 // are incompatible. 3502 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3503 RHSPE = RHS->qual_end(); 3504 RHSPI != RHSPE; RHSPI++) { 3505 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3506 RHSImplementsProtocol = true; 3507 break; 3508 } 3509 } 3510 // FIXME: For better diagnostics, consider passing back the protocol name. 3511 if (!RHSImplementsProtocol) 3512 return false; 3513 } 3514 // The RHS implements all protocols listed on the LHS. 3515 return true; 3516} 3517 3518bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3519 // get the "pointed to" types 3520 const ObjCObjectPointerType *LHSOPT = LHS->getAsObjCObjectPointerType(); 3521 const ObjCObjectPointerType *RHSOPT = RHS->getAsObjCObjectPointerType(); 3522 3523 if (!LHSOPT || !RHSOPT) 3524 return false; 3525 3526 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3527 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3528} 3529 3530/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3531/// both shall have the identically qualified version of a compatible type. 3532/// C99 6.2.7p1: Two types have compatible types if their types are the 3533/// same. See 6.7.[2,3,5] for additional rules. 3534bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3535 return !mergeTypes(LHS, RHS).isNull(); 3536} 3537 3538QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3539 const FunctionType *lbase = lhs->getAsFunctionType(); 3540 const FunctionType *rbase = rhs->getAsFunctionType(); 3541 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3542 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3543 bool allLTypes = true; 3544 bool allRTypes = true; 3545 3546 // Check return type 3547 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3548 if (retType.isNull()) return QualType(); 3549 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3550 allLTypes = false; 3551 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3552 allRTypes = false; 3553 // FIXME: double check this 3554 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 3555 if (NoReturn != lbase->getNoReturnAttr()) 3556 allLTypes = false; 3557 if (NoReturn != rbase->getNoReturnAttr()) 3558 allRTypes = false; 3559 3560 if (lproto && rproto) { // two C99 style function prototypes 3561 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3562 "C++ shouldn't be here"); 3563 unsigned lproto_nargs = lproto->getNumArgs(); 3564 unsigned rproto_nargs = rproto->getNumArgs(); 3565 3566 // Compatible functions must have the same number of arguments 3567 if (lproto_nargs != rproto_nargs) 3568 return QualType(); 3569 3570 // Variadic and non-variadic functions aren't compatible 3571 if (lproto->isVariadic() != rproto->isVariadic()) 3572 return QualType(); 3573 3574 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3575 return QualType(); 3576 3577 // Check argument compatibility 3578 llvm::SmallVector<QualType, 10> types; 3579 for (unsigned i = 0; i < lproto_nargs; i++) { 3580 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3581 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3582 QualType argtype = mergeTypes(largtype, rargtype); 3583 if (argtype.isNull()) return QualType(); 3584 types.push_back(argtype); 3585 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3586 allLTypes = false; 3587 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3588 allRTypes = false; 3589 } 3590 if (allLTypes) return lhs; 3591 if (allRTypes) return rhs; 3592 return getFunctionType(retType, types.begin(), types.size(), 3593 lproto->isVariadic(), lproto->getTypeQuals(), 3594 NoReturn); 3595 } 3596 3597 if (lproto) allRTypes = false; 3598 if (rproto) allLTypes = false; 3599 3600 const FunctionProtoType *proto = lproto ? lproto : rproto; 3601 if (proto) { 3602 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3603 if (proto->isVariadic()) return QualType(); 3604 // Check that the types are compatible with the types that 3605 // would result from default argument promotions (C99 6.7.5.3p15). 3606 // The only types actually affected are promotable integer 3607 // types and floats, which would be passed as a different 3608 // type depending on whether the prototype is visible. 3609 unsigned proto_nargs = proto->getNumArgs(); 3610 for (unsigned i = 0; i < proto_nargs; ++i) { 3611 QualType argTy = proto->getArgType(i); 3612 if (argTy->isPromotableIntegerType() || 3613 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3614 return QualType(); 3615 } 3616 3617 if (allLTypes) return lhs; 3618 if (allRTypes) return rhs; 3619 return getFunctionType(retType, proto->arg_type_begin(), 3620 proto->getNumArgs(), proto->isVariadic(), 3621 proto->getTypeQuals(), NoReturn); 3622 } 3623 3624 if (allLTypes) return lhs; 3625 if (allRTypes) return rhs; 3626 return getFunctionNoProtoType(retType, NoReturn); 3627} 3628 3629QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3630 // C++ [expr]: If an expression initially has the type "reference to T", the 3631 // type is adjusted to "T" prior to any further analysis, the expression 3632 // designates the object or function denoted by the reference, and the 3633 // expression is an lvalue unless the reference is an rvalue reference and 3634 // the expression is a function call (possibly inside parentheses). 3635 // FIXME: C++ shouldn't be going through here! The rules are different 3636 // enough that they should be handled separately. 3637 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3638 // shouldn't be going through here! 3639 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 3640 LHS = RT->getPointeeType(); 3641 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 3642 RHS = RT->getPointeeType(); 3643 3644 QualType LHSCan = getCanonicalType(LHS), 3645 RHSCan = getCanonicalType(RHS); 3646 3647 // If two types are identical, they are compatible. 3648 if (LHSCan == RHSCan) 3649 return LHS; 3650 3651 // If the qualifiers are different, the types aren't compatible 3652 // Note that we handle extended qualifiers later, in the 3653 // case for ExtQualType. 3654 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3655 return QualType(); 3656 3657 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3658 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3659 3660 // We want to consider the two function types to be the same for these 3661 // comparisons, just force one to the other. 3662 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3663 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3664 3665 // Strip off objc_gc attributes off the top level so they can be merged. 3666 // This is a complete mess, but the attribute itself doesn't make much sense. 3667 if (RHSClass == Type::ExtQual) { 3668 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3669 if (GCAttr != QualType::GCNone) { 3670 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3671 // __weak attribute must appear on both declarations. 3672 // __strong attribue is redundant if other decl is an objective-c 3673 // object pointer (or decorated with __strong attribute); otherwise 3674 // issue error. 3675 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3676 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3677 !LHSCan->isObjCObjectPointerType())) 3678 return QualType(); 3679 3680 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3681 RHS.getCVRQualifiers()); 3682 QualType Result = mergeTypes(LHS, RHS); 3683 if (!Result.isNull()) { 3684 if (Result.getObjCGCAttr() == QualType::GCNone) 3685 Result = getObjCGCQualType(Result, GCAttr); 3686 else if (Result.getObjCGCAttr() != GCAttr) 3687 Result = QualType(); 3688 } 3689 return Result; 3690 } 3691 } 3692 if (LHSClass == Type::ExtQual) { 3693 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3694 if (GCAttr != QualType::GCNone) { 3695 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3696 // __weak attribute must appear on both declarations. __strong 3697 // __strong attribue is redundant if other decl is an objective-c 3698 // object pointer (or decorated with __strong attribute); otherwise 3699 // issue error. 3700 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3701 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3702 !RHSCan->isObjCObjectPointerType())) 3703 return QualType(); 3704 3705 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3706 LHS.getCVRQualifiers()); 3707 QualType Result = mergeTypes(LHS, RHS); 3708 if (!Result.isNull()) { 3709 if (Result.getObjCGCAttr() == QualType::GCNone) 3710 Result = getObjCGCQualType(Result, GCAttr); 3711 else if (Result.getObjCGCAttr() != GCAttr) 3712 Result = QualType(); 3713 } 3714 return Result; 3715 } 3716 } 3717 3718 // Same as above for arrays 3719 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3720 LHSClass = Type::ConstantArray; 3721 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3722 RHSClass = Type::ConstantArray; 3723 3724 // Canonicalize ExtVector -> Vector. 3725 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3726 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3727 3728 // If the canonical type classes don't match. 3729 if (LHSClass != RHSClass) { 3730 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3731 // a signed integer type, or an unsigned integer type. 3732 if (const EnumType* ETy = LHS->getAsEnumType()) { 3733 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3734 return RHS; 3735 } 3736 if (const EnumType* ETy = RHS->getAsEnumType()) { 3737 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3738 return LHS; 3739 } 3740 3741 return QualType(); 3742 } 3743 3744 // The canonical type classes match. 3745 switch (LHSClass) { 3746#define TYPE(Class, Base) 3747#define ABSTRACT_TYPE(Class, Base) 3748#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3749#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3750#include "clang/AST/TypeNodes.def" 3751 assert(false && "Non-canonical and dependent types shouldn't get here"); 3752 return QualType(); 3753 3754 case Type::LValueReference: 3755 case Type::RValueReference: 3756 case Type::MemberPointer: 3757 assert(false && "C++ should never be in mergeTypes"); 3758 return QualType(); 3759 3760 case Type::IncompleteArray: 3761 case Type::VariableArray: 3762 case Type::FunctionProto: 3763 case Type::ExtVector: 3764 assert(false && "Types are eliminated above"); 3765 return QualType(); 3766 3767 case Type::Pointer: 3768 { 3769 // Merge two pointer types, while trying to preserve typedef info 3770 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 3771 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 3772 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3773 if (ResultType.isNull()) return QualType(); 3774 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3775 return LHS; 3776 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3777 return RHS; 3778 return getPointerType(ResultType); 3779 } 3780 case Type::BlockPointer: 3781 { 3782 // Merge two block pointer types, while trying to preserve typedef info 3783 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 3784 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 3785 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3786 if (ResultType.isNull()) return QualType(); 3787 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3788 return LHS; 3789 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3790 return RHS; 3791 return getBlockPointerType(ResultType); 3792 } 3793 case Type::ConstantArray: 3794 { 3795 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3796 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3797 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3798 return QualType(); 3799 3800 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3801 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3802 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3803 if (ResultType.isNull()) return QualType(); 3804 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3805 return LHS; 3806 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3807 return RHS; 3808 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3809 ArrayType::ArraySizeModifier(), 0); 3810 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3811 ArrayType::ArraySizeModifier(), 0); 3812 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3813 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3814 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3815 return LHS; 3816 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3817 return RHS; 3818 if (LVAT) { 3819 // FIXME: This isn't correct! But tricky to implement because 3820 // the array's size has to be the size of LHS, but the type 3821 // has to be different. 3822 return LHS; 3823 } 3824 if (RVAT) { 3825 // FIXME: This isn't correct! But tricky to implement because 3826 // the array's size has to be the size of RHS, but the type 3827 // has to be different. 3828 return RHS; 3829 } 3830 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3831 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3832 return getIncompleteArrayType(ResultType, 3833 ArrayType::ArraySizeModifier(), 0); 3834 } 3835 case Type::FunctionNoProto: 3836 return mergeFunctionTypes(LHS, RHS); 3837 case Type::Record: 3838 case Type::Enum: 3839 return QualType(); 3840 case Type::Builtin: 3841 // Only exactly equal builtin types are compatible, which is tested above. 3842 return QualType(); 3843 case Type::Complex: 3844 // Distinct complex types are incompatible. 3845 return QualType(); 3846 case Type::Vector: 3847 // FIXME: The merged type should be an ExtVector! 3848 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3849 return LHS; 3850 return QualType(); 3851 case Type::ObjCInterface: { 3852 // Check if the interfaces are assignment compatible. 3853 // FIXME: This should be type compatibility, e.g. whether 3854 // "LHS x; RHS x;" at global scope is legal. 3855 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3856 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3857 if (LHSIface && RHSIface && 3858 canAssignObjCInterfaces(LHSIface, RHSIface)) 3859 return LHS; 3860 3861 return QualType(); 3862 } 3863 case Type::ObjCObjectPointer: { 3864 if (canAssignObjCInterfaces(LHS->getAsObjCObjectPointerType(), 3865 RHS->getAsObjCObjectPointerType())) 3866 return LHS; 3867 3868 return QualType(); 3869 } 3870 case Type::FixedWidthInt: 3871 // Distinct fixed-width integers are not compatible. 3872 return QualType(); 3873 case Type::ExtQual: 3874 // FIXME: ExtQual types can be compatible even if they're not 3875 // identical! 3876 return QualType(); 3877 // First attempt at an implementation, but I'm not really sure it's 3878 // right... 3879#if 0 3880 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3881 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3882 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3883 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3884 return QualType(); 3885 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3886 LHSBase = QualType(LQual->getBaseType(), 0); 3887 RHSBase = QualType(RQual->getBaseType(), 0); 3888 ResultType = mergeTypes(LHSBase, RHSBase); 3889 if (ResultType.isNull()) return QualType(); 3890 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3891 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3892 return LHS; 3893 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3894 return RHS; 3895 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3896 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3897 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3898 return ResultType; 3899#endif 3900 3901 case Type::TemplateSpecialization: 3902 assert(false && "Dependent types have no size"); 3903 break; 3904 } 3905 3906 return QualType(); 3907} 3908 3909//===----------------------------------------------------------------------===// 3910// Integer Predicates 3911//===----------------------------------------------------------------------===// 3912 3913unsigned ASTContext::getIntWidth(QualType T) { 3914 if (T == BoolTy) 3915 return 1; 3916 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3917 return FWIT->getWidth(); 3918 } 3919 // For builtin types, just use the standard type sizing method 3920 return (unsigned)getTypeSize(T); 3921} 3922 3923QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3924 assert(T->isSignedIntegerType() && "Unexpected type"); 3925 if (const EnumType* ETy = T->getAsEnumType()) 3926 T = ETy->getDecl()->getIntegerType(); 3927 const BuiltinType* BTy = T->getAsBuiltinType(); 3928 assert (BTy && "Unexpected signed integer type"); 3929 switch (BTy->getKind()) { 3930 case BuiltinType::Char_S: 3931 case BuiltinType::SChar: 3932 return UnsignedCharTy; 3933 case BuiltinType::Short: 3934 return UnsignedShortTy; 3935 case BuiltinType::Int: 3936 return UnsignedIntTy; 3937 case BuiltinType::Long: 3938 return UnsignedLongTy; 3939 case BuiltinType::LongLong: 3940 return UnsignedLongLongTy; 3941 case BuiltinType::Int128: 3942 return UnsignedInt128Ty; 3943 default: 3944 assert(0 && "Unexpected signed integer type"); 3945 return QualType(); 3946 } 3947} 3948 3949ExternalASTSource::~ExternalASTSource() { } 3950 3951void ExternalASTSource::PrintStats() { } 3952 3953 3954//===----------------------------------------------------------------------===// 3955// Builtin Type Computation 3956//===----------------------------------------------------------------------===// 3957 3958/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3959/// pointer over the consumed characters. This returns the resultant type. 3960static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3961 ASTContext::GetBuiltinTypeError &Error, 3962 bool AllowTypeModifiers = true) { 3963 // Modifiers. 3964 int HowLong = 0; 3965 bool Signed = false, Unsigned = false; 3966 3967 // Read the modifiers first. 3968 bool Done = false; 3969 while (!Done) { 3970 switch (*Str++) { 3971 default: Done = true; --Str; break; 3972 case 'S': 3973 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3974 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3975 Signed = true; 3976 break; 3977 case 'U': 3978 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 3979 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 3980 Unsigned = true; 3981 break; 3982 case 'L': 3983 assert(HowLong <= 2 && "Can't have LLLL modifier"); 3984 ++HowLong; 3985 break; 3986 } 3987 } 3988 3989 QualType Type; 3990 3991 // Read the base type. 3992 switch (*Str++) { 3993 default: assert(0 && "Unknown builtin type letter!"); 3994 case 'v': 3995 assert(HowLong == 0 && !Signed && !Unsigned && 3996 "Bad modifiers used with 'v'!"); 3997 Type = Context.VoidTy; 3998 break; 3999 case 'f': 4000 assert(HowLong == 0 && !Signed && !Unsigned && 4001 "Bad modifiers used with 'f'!"); 4002 Type = Context.FloatTy; 4003 break; 4004 case 'd': 4005 assert(HowLong < 2 && !Signed && !Unsigned && 4006 "Bad modifiers used with 'd'!"); 4007 if (HowLong) 4008 Type = Context.LongDoubleTy; 4009 else 4010 Type = Context.DoubleTy; 4011 break; 4012 case 's': 4013 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4014 if (Unsigned) 4015 Type = Context.UnsignedShortTy; 4016 else 4017 Type = Context.ShortTy; 4018 break; 4019 case 'i': 4020 if (HowLong == 3) 4021 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4022 else if (HowLong == 2) 4023 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4024 else if (HowLong == 1) 4025 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4026 else 4027 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4028 break; 4029 case 'c': 4030 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4031 if (Signed) 4032 Type = Context.SignedCharTy; 4033 else if (Unsigned) 4034 Type = Context.UnsignedCharTy; 4035 else 4036 Type = Context.CharTy; 4037 break; 4038 case 'b': // boolean 4039 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4040 Type = Context.BoolTy; 4041 break; 4042 case 'z': // size_t. 4043 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4044 Type = Context.getSizeType(); 4045 break; 4046 case 'F': 4047 Type = Context.getCFConstantStringType(); 4048 break; 4049 case 'a': 4050 Type = Context.getBuiltinVaListType(); 4051 assert(!Type.isNull() && "builtin va list type not initialized!"); 4052 break; 4053 case 'A': 4054 // This is a "reference" to a va_list; however, what exactly 4055 // this means depends on how va_list is defined. There are two 4056 // different kinds of va_list: ones passed by value, and ones 4057 // passed by reference. An example of a by-value va_list is 4058 // x86, where va_list is a char*. An example of by-ref va_list 4059 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4060 // we want this argument to be a char*&; for x86-64, we want 4061 // it to be a __va_list_tag*. 4062 Type = Context.getBuiltinVaListType(); 4063 assert(!Type.isNull() && "builtin va list type not initialized!"); 4064 if (Type->isArrayType()) { 4065 Type = Context.getArrayDecayedType(Type); 4066 } else { 4067 Type = Context.getLValueReferenceType(Type); 4068 } 4069 break; 4070 case 'V': { 4071 char *End; 4072 unsigned NumElements = strtoul(Str, &End, 10); 4073 assert(End != Str && "Missing vector size"); 4074 4075 Str = End; 4076 4077 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4078 Type = Context.getVectorType(ElementType, NumElements); 4079 break; 4080 } 4081 case 'P': 4082 Type = Context.getFILEType(); 4083 if (Type.isNull()) { 4084 Error = ASTContext::GE_Missing_stdio; 4085 return QualType(); 4086 } 4087 break; 4088 case 'J': 4089 if (Signed) 4090 Type = Context.getsigjmp_bufType(); 4091 else 4092 Type = Context.getjmp_bufType(); 4093 4094 if (Type.isNull()) { 4095 Error = ASTContext::GE_Missing_setjmp; 4096 return QualType(); 4097 } 4098 break; 4099 } 4100 4101 if (!AllowTypeModifiers) 4102 return Type; 4103 4104 Done = false; 4105 while (!Done) { 4106 switch (*Str++) { 4107 default: Done = true; --Str; break; 4108 case '*': 4109 Type = Context.getPointerType(Type); 4110 break; 4111 case '&': 4112 Type = Context.getLValueReferenceType(Type); 4113 break; 4114 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4115 case 'C': 4116 Type = Type.getQualifiedType(QualType::Const); 4117 break; 4118 } 4119 } 4120 4121 return Type; 4122} 4123 4124/// GetBuiltinType - Return the type for the specified builtin. 4125QualType ASTContext::GetBuiltinType(unsigned id, 4126 GetBuiltinTypeError &Error) { 4127 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4128 4129 llvm::SmallVector<QualType, 8> ArgTypes; 4130 4131 Error = GE_None; 4132 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4133 if (Error != GE_None) 4134 return QualType(); 4135 while (TypeStr[0] && TypeStr[0] != '.') { 4136 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4137 if (Error != GE_None) 4138 return QualType(); 4139 4140 // Do array -> pointer decay. The builtin should use the decayed type. 4141 if (Ty->isArrayType()) 4142 Ty = getArrayDecayedType(Ty); 4143 4144 ArgTypes.push_back(Ty); 4145 } 4146 4147 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4148 "'.' should only occur at end of builtin type list!"); 4149 4150 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4151 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4152 return getFunctionNoProtoType(ResType); 4153 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4154 TypeStr[0] == '.', 0); 4155} 4156