ASTContext.cpp revision 47259d9ca7840dd66f06f5f11da7768b23d1e0fd
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, false, 1620 false, 0, 0, NoReturn); 1621 1622 // Get the new insert position for the node we care about. 1623 FunctionProtoType *NewIP = 1624 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1625 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1626 } 1627 1628 // FunctionProtoType objects are allocated with extra bytes after them 1629 // for two variable size arrays (for parameter and exception types) at the 1630 // end of them. 1631 FunctionProtoType *FTP = 1632 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1633 NumArgs*sizeof(QualType) + 1634 NumExs*sizeof(QualType), 8); 1635 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1636 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1637 ExArray, NumExs, Canonical, NoReturn); 1638 Types.push_back(FTP); 1639 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1640 return QualType(FTP, 0); 1641} 1642 1643/// getTypeDeclType - Return the unique reference to the type for the 1644/// specified type declaration. 1645QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1646 assert(Decl && "Passed null for Decl param"); 1647 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1648 1649 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1650 return getTypedefType(Typedef); 1651 else if (isa<TemplateTypeParmDecl>(Decl)) { 1652 assert(false && "Template type parameter types are always available."); 1653 } else if (ObjCInterfaceDecl *ObjCInterface 1654 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1655 return getObjCInterfaceType(ObjCInterface); 1656 1657 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1658 if (PrevDecl) 1659 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1660 else 1661 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1662 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1663 if (PrevDecl) 1664 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1665 else 1666 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1667 } else 1668 assert(false && "TypeDecl without a type?"); 1669 1670 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1671 return QualType(Decl->TypeForDecl, 0); 1672} 1673 1674/// getTypedefType - Return the unique reference to the type for the 1675/// specified typename decl. 1676QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1677 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1678 1679 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1680 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1681 Types.push_back(Decl->TypeForDecl); 1682 return QualType(Decl->TypeForDecl, 0); 1683} 1684 1685/// \brief Retrieve the template type parameter type for a template 1686/// parameter or parameter pack with the given depth, index, and (optionally) 1687/// name. 1688QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1689 bool ParameterPack, 1690 IdentifierInfo *Name) { 1691 llvm::FoldingSetNodeID ID; 1692 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1693 void *InsertPos = 0; 1694 TemplateTypeParmType *TypeParm 1695 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1696 1697 if (TypeParm) 1698 return QualType(TypeParm, 0); 1699 1700 if (Name) { 1701 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1702 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack, 1703 Name, Canon); 1704 } else 1705 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack); 1706 1707 Types.push_back(TypeParm); 1708 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1709 1710 return QualType(TypeParm, 0); 1711} 1712 1713QualType 1714ASTContext::getTemplateSpecializationType(TemplateName Template, 1715 const TemplateArgument *Args, 1716 unsigned NumArgs, 1717 QualType Canon) { 1718 if (!Canon.isNull()) 1719 Canon = getCanonicalType(Canon); 1720 else { 1721 // Build the canonical template specialization type. 1722 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1723 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1724 CanonArgs.reserve(NumArgs); 1725 for (unsigned I = 0; I != NumArgs; ++I) 1726 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1727 1728 // Determine whether this canonical template specialization type already 1729 // exists. 1730 llvm::FoldingSetNodeID ID; 1731 TemplateSpecializationType::Profile(ID, CanonTemplate, 1732 CanonArgs.data(), NumArgs, *this); 1733 1734 void *InsertPos = 0; 1735 TemplateSpecializationType *Spec 1736 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1737 1738 if (!Spec) { 1739 // Allocate a new canonical template specialization type. 1740 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1741 sizeof(TemplateArgument) * NumArgs), 1742 8); 1743 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1744 CanonArgs.data(), NumArgs, 1745 Canon); 1746 Types.push_back(Spec); 1747 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1748 } 1749 1750 if (Canon.isNull()) 1751 Canon = QualType(Spec, 0); 1752 assert(Canon->isDependentType() && 1753 "Non-dependent template-id type must have a canonical type"); 1754 } 1755 1756 // Allocate the (non-canonical) template specialization type, but don't 1757 // try to unique it: these types typically have location information that 1758 // we don't unique and don't want to lose. 1759 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1760 sizeof(TemplateArgument) * NumArgs), 1761 8); 1762 TemplateSpecializationType *Spec 1763 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1764 Canon); 1765 1766 Types.push_back(Spec); 1767 return QualType(Spec, 0); 1768} 1769 1770QualType 1771ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1772 QualType NamedType) { 1773 llvm::FoldingSetNodeID ID; 1774 QualifiedNameType::Profile(ID, NNS, NamedType); 1775 1776 void *InsertPos = 0; 1777 QualifiedNameType *T 1778 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1779 if (T) 1780 return QualType(T, 0); 1781 1782 T = new (*this) QualifiedNameType(NNS, NamedType, 1783 getCanonicalType(NamedType)); 1784 Types.push_back(T); 1785 QualifiedNameTypes.InsertNode(T, InsertPos); 1786 return QualType(T, 0); 1787} 1788 1789QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1790 const IdentifierInfo *Name, 1791 QualType Canon) { 1792 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1793 1794 if (Canon.isNull()) { 1795 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1796 if (CanonNNS != NNS) 1797 Canon = getTypenameType(CanonNNS, Name); 1798 } 1799 1800 llvm::FoldingSetNodeID ID; 1801 TypenameType::Profile(ID, NNS, Name); 1802 1803 void *InsertPos = 0; 1804 TypenameType *T 1805 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1806 if (T) 1807 return QualType(T, 0); 1808 1809 T = new (*this) TypenameType(NNS, Name, Canon); 1810 Types.push_back(T); 1811 TypenameTypes.InsertNode(T, InsertPos); 1812 return QualType(T, 0); 1813} 1814 1815QualType 1816ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1817 const TemplateSpecializationType *TemplateId, 1818 QualType Canon) { 1819 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1820 1821 if (Canon.isNull()) { 1822 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1823 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1824 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1825 const TemplateSpecializationType *CanonTemplateId 1826 = CanonType->getAsTemplateSpecializationType(); 1827 assert(CanonTemplateId && 1828 "Canonical type must also be a template specialization type"); 1829 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1830 } 1831 } 1832 1833 llvm::FoldingSetNodeID ID; 1834 TypenameType::Profile(ID, NNS, TemplateId); 1835 1836 void *InsertPos = 0; 1837 TypenameType *T 1838 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1839 if (T) 1840 return QualType(T, 0); 1841 1842 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1843 Types.push_back(T); 1844 TypenameTypes.InsertNode(T, InsertPos); 1845 return QualType(T, 0); 1846} 1847 1848/// CmpProtocolNames - Comparison predicate for sorting protocols 1849/// alphabetically. 1850static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1851 const ObjCProtocolDecl *RHS) { 1852 return LHS->getDeclName() < RHS->getDeclName(); 1853} 1854 1855static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1856 unsigned &NumProtocols) { 1857 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1858 1859 // Sort protocols, keyed by name. 1860 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1861 1862 // Remove duplicates. 1863 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1864 NumProtocols = ProtocolsEnd-Protocols; 1865} 1866 1867/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1868/// the given interface decl and the conforming protocol list. 1869QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1870 ObjCProtocolDecl **Protocols, 1871 unsigned NumProtocols) { 1872 // Sort the protocol list alphabetically to canonicalize it. 1873 if (NumProtocols) 1874 SortAndUniqueProtocols(Protocols, NumProtocols); 1875 1876 llvm::FoldingSetNodeID ID; 1877 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1878 1879 void *InsertPos = 0; 1880 if (ObjCObjectPointerType *QT = 1881 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1882 return QualType(QT, 0); 1883 1884 // No Match; 1885 ObjCObjectPointerType *QType = 1886 new (*this,8) ObjCObjectPointerType(InterfaceT, Protocols, NumProtocols); 1887 1888 Types.push_back(QType); 1889 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1890 return QualType(QType, 0); 1891} 1892 1893/// getObjCInterfaceType - Return the unique reference to the type for the 1894/// specified ObjC interface decl. The list of protocols is optional. 1895QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1896 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1897 if (NumProtocols) 1898 // Sort the protocol list alphabetically to canonicalize it. 1899 SortAndUniqueProtocols(Protocols, NumProtocols); 1900 1901 llvm::FoldingSetNodeID ID; 1902 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1903 1904 void *InsertPos = 0; 1905 if (ObjCInterfaceType *QT = 1906 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1907 return QualType(QT, 0); 1908 1909 // No Match; 1910 ObjCInterfaceType *QType = 1911 new (*this,8) ObjCInterfaceType(const_cast<ObjCInterfaceDecl*>(Decl), 1912 Protocols, NumProtocols); 1913 Types.push_back(QType); 1914 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 1915 return QualType(QType, 0); 1916} 1917 1918/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1919/// TypeOfExprType AST's (since expression's are never shared). For example, 1920/// multiple declarations that refer to "typeof(x)" all contain different 1921/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1922/// on canonical type's (which are always unique). 1923QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1924 TypeOfExprType *toe; 1925 if (tofExpr->isTypeDependent()) { 1926 llvm::FoldingSetNodeID ID; 1927 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 1928 1929 void *InsertPos = 0; 1930 DependentTypeOfExprType *Canon 1931 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 1932 if (Canon) { 1933 // We already have a "canonical" version of an identical, dependent 1934 // typeof(expr) type. Use that as our canonical type. 1935 toe = new (*this, 8) TypeOfExprType(tofExpr, 1936 QualType((TypeOfExprType*)Canon, 0)); 1937 } 1938 else { 1939 // Build a new, canonical typeof(expr) type. 1940 Canon = new (*this, 8) DependentTypeOfExprType(*this, tofExpr); 1941 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 1942 toe = Canon; 1943 } 1944 } else { 1945 QualType Canonical = getCanonicalType(tofExpr->getType()); 1946 toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 1947 } 1948 Types.push_back(toe); 1949 return QualType(toe, 0); 1950} 1951 1952/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1953/// TypeOfType AST's. The only motivation to unique these nodes would be 1954/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1955/// an issue. This doesn't effect the type checker, since it operates 1956/// on canonical type's (which are always unique). 1957QualType ASTContext::getTypeOfType(QualType tofType) { 1958 QualType Canonical = getCanonicalType(tofType); 1959 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 1960 Types.push_back(tot); 1961 return QualType(tot, 0); 1962} 1963 1964/// getDecltypeForExpr - Given an expr, will return the decltype for that 1965/// expression, according to the rules in C++0x [dcl.type.simple]p4 1966static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 1967 if (e->isTypeDependent()) 1968 return Context.DependentTy; 1969 1970 // If e is an id expression or a class member access, decltype(e) is defined 1971 // as the type of the entity named by e. 1972 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 1973 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 1974 return VD->getType(); 1975 } 1976 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 1977 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1978 return FD->getType(); 1979 } 1980 // If e is a function call or an invocation of an overloaded operator, 1981 // (parentheses around e are ignored), decltype(e) is defined as the 1982 // return type of that function. 1983 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 1984 return CE->getCallReturnType(); 1985 1986 QualType T = e->getType(); 1987 1988 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 1989 // defined as T&, otherwise decltype(e) is defined as T. 1990 if (e->isLvalue(Context) == Expr::LV_Valid) 1991 T = Context.getLValueReferenceType(T); 1992 1993 return T; 1994} 1995 1996/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 1997/// DecltypeType AST's. The only motivation to unique these nodes would be 1998/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 1999/// an issue. This doesn't effect the type checker, since it operates 2000/// on canonical type's (which are always unique). 2001QualType ASTContext::getDecltypeType(Expr *e) { 2002 DecltypeType *dt; 2003 if (e->isTypeDependent()) { 2004 llvm::FoldingSetNodeID ID; 2005 DependentDecltypeType::Profile(ID, *this, e); 2006 2007 void *InsertPos = 0; 2008 DependentDecltypeType *Canon 2009 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2010 if (Canon) { 2011 // We already have a "canonical" version of an equivalent, dependent 2012 // decltype type. Use that as our canonical type. 2013 dt = new (*this, 8) DecltypeType(e, DependentTy, 2014 QualType((DecltypeType*)Canon, 0)); 2015 } 2016 else { 2017 // Build a new, canonical typeof(expr) type. 2018 Canon = new (*this, 8) DependentDecltypeType(*this, e); 2019 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2020 dt = Canon; 2021 } 2022 } else { 2023 QualType T = getDecltypeForExpr(e, *this); 2024 dt = new (*this, 8) DecltypeType(e, T, getCanonicalType(T)); 2025 } 2026 Types.push_back(dt); 2027 return QualType(dt, 0); 2028} 2029 2030/// getTagDeclType - Return the unique reference to the type for the 2031/// specified TagDecl (struct/union/class/enum) decl. 2032QualType ASTContext::getTagDeclType(TagDecl *Decl) { 2033 assert (Decl); 2034 return getTypeDeclType(Decl); 2035} 2036 2037/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2038/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2039/// needs to agree with the definition in <stddef.h>. 2040QualType ASTContext::getSizeType() const { 2041 return getFromTargetType(Target.getSizeType()); 2042} 2043 2044/// getSignedWCharType - Return the type of "signed wchar_t". 2045/// Used when in C++, as a GCC extension. 2046QualType ASTContext::getSignedWCharType() const { 2047 // FIXME: derive from "Target" ? 2048 return WCharTy; 2049} 2050 2051/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2052/// Used when in C++, as a GCC extension. 2053QualType ASTContext::getUnsignedWCharType() const { 2054 // FIXME: derive from "Target" ? 2055 return UnsignedIntTy; 2056} 2057 2058/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2059/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2060QualType ASTContext::getPointerDiffType() const { 2061 return getFromTargetType(Target.getPtrDiffType(0)); 2062} 2063 2064//===----------------------------------------------------------------------===// 2065// Type Operators 2066//===----------------------------------------------------------------------===// 2067 2068/// getCanonicalType - Return the canonical (structural) type corresponding to 2069/// the specified potentially non-canonical type. The non-canonical version 2070/// of a type may have many "decorated" versions of types. Decorators can 2071/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2072/// to be free of any of these, allowing two canonical types to be compared 2073/// for exact equality with a simple pointer comparison. 2074CanQualType ASTContext::getCanonicalType(QualType T) { 2075 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 2076 2077 // If the result has type qualifiers, make sure to canonicalize them as well. 2078 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 2079 if (TypeQuals == 0) 2080 return CanQualType::CreateUnsafe(CanType); 2081 2082 // If the type qualifiers are on an array type, get the canonical type of the 2083 // array with the qualifiers applied to the element type. 2084 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2085 if (!AT) 2086 return CanQualType::CreateUnsafe(CanType.getQualifiedType(TypeQuals)); 2087 2088 // Get the canonical version of the element with the extra qualifiers on it. 2089 // This can recursively sink qualifiers through multiple levels of arrays. 2090 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 2091 NewEltTy = getCanonicalType(NewEltTy); 2092 2093 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2094 return CanQualType::CreateUnsafe( 2095 getConstantArrayType(NewEltTy, CAT->getSize(), 2096 CAT->getSizeModifier(), 2097 CAT->getIndexTypeQualifier())); 2098 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2099 return CanQualType::CreateUnsafe( 2100 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2101 IAT->getIndexTypeQualifier())); 2102 2103 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2104 return CanQualType::CreateUnsafe( 2105 getDependentSizedArrayType(NewEltTy, 2106 DSAT->getSizeExpr(), 2107 DSAT->getSizeModifier(), 2108 DSAT->getIndexTypeQualifier(), 2109 DSAT->getBracketsRange())); 2110 2111 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2112 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2113 VAT->getSizeExpr(), 2114 VAT->getSizeModifier(), 2115 VAT->getIndexTypeQualifier(), 2116 VAT->getBracketsRange())); 2117} 2118 2119TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2120 // If this template name refers to a template, the canonical 2121 // template name merely stores the template itself. 2122 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2123 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2124 2125 // If this template name refers to a set of overloaded function templates, 2126 /// the canonical template name merely stores the set of function templates. 2127 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) { 2128 OverloadedFunctionDecl *CanonOvl = 0; 2129 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 2130 FEnd = Ovl->function_end(); 2131 F != FEnd; ++F) { 2132 Decl *Canon = F->get()->getCanonicalDecl(); 2133 if (CanonOvl || Canon != F->get()) { 2134 if (!CanonOvl) 2135 CanonOvl = OverloadedFunctionDecl::Create(*this, 2136 Ovl->getDeclContext(), 2137 Ovl->getDeclName()); 2138 2139 CanonOvl->addOverload( 2140 AnyFunctionDecl::getFromNamedDecl(cast<NamedDecl>(Canon))); 2141 } 2142 } 2143 2144 return TemplateName(CanonOvl? CanonOvl : Ovl); 2145 } 2146 2147 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2148 assert(DTN && "Non-dependent template names must refer to template decls."); 2149 return DTN->CanonicalTemplateName; 2150} 2151 2152TemplateArgument 2153ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2154 switch (Arg.getKind()) { 2155 case TemplateArgument::Null: 2156 return Arg; 2157 2158 case TemplateArgument::Expression: 2159 // FIXME: Build canonical expression? 2160 return Arg; 2161 2162 case TemplateArgument::Declaration: 2163 return TemplateArgument(SourceLocation(), 2164 Arg.getAsDecl()->getCanonicalDecl()); 2165 2166 case TemplateArgument::Integral: 2167 return TemplateArgument(SourceLocation(), 2168 *Arg.getAsIntegral(), 2169 getCanonicalType(Arg.getIntegralType())); 2170 2171 case TemplateArgument::Type: 2172 return TemplateArgument(SourceLocation(), 2173 getCanonicalType(Arg.getAsType())); 2174 2175 case TemplateArgument::Pack: { 2176 // FIXME: Allocate in ASTContext 2177 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2178 unsigned Idx = 0; 2179 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2180 AEnd = Arg.pack_end(); 2181 A != AEnd; (void)++A, ++Idx) 2182 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2183 2184 TemplateArgument Result; 2185 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2186 return Result; 2187 } 2188 } 2189 2190 // Silence GCC warning 2191 assert(false && "Unhandled template argument kind"); 2192 return TemplateArgument(); 2193} 2194 2195NestedNameSpecifier * 2196ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2197 if (!NNS) 2198 return 0; 2199 2200 switch (NNS->getKind()) { 2201 case NestedNameSpecifier::Identifier: 2202 // Canonicalize the prefix but keep the identifier the same. 2203 return NestedNameSpecifier::Create(*this, 2204 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2205 NNS->getAsIdentifier()); 2206 2207 case NestedNameSpecifier::Namespace: 2208 // A namespace is canonical; build a nested-name-specifier with 2209 // this namespace and no prefix. 2210 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2211 2212 case NestedNameSpecifier::TypeSpec: 2213 case NestedNameSpecifier::TypeSpecWithTemplate: { 2214 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2215 NestedNameSpecifier *Prefix = 0; 2216 2217 // FIXME: This isn't the right check! 2218 if (T->isDependentType()) 2219 Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix()); 2220 2221 return NestedNameSpecifier::Create(*this, Prefix, 2222 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2223 T.getTypePtr()); 2224 } 2225 2226 case NestedNameSpecifier::Global: 2227 // The global specifier is canonical and unique. 2228 return NNS; 2229 } 2230 2231 // Required to silence a GCC warning 2232 return 0; 2233} 2234 2235 2236const ArrayType *ASTContext::getAsArrayType(QualType T) { 2237 // Handle the non-qualified case efficiently. 2238 if (T.getCVRQualifiers() == 0) { 2239 // Handle the common positive case fast. 2240 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2241 return AT; 2242 } 2243 2244 // Handle the common negative case fast, ignoring CVR qualifiers. 2245 QualType CType = T->getCanonicalTypeInternal(); 2246 2247 // Make sure to look through type qualifiers (like ExtQuals) for the negative 2248 // test. 2249 if (!isa<ArrayType>(CType) && 2250 !isa<ArrayType>(CType.getUnqualifiedType())) 2251 return 0; 2252 2253 // Apply any CVR qualifiers from the array type to the element type. This 2254 // implements C99 6.7.3p8: "If the specification of an array type includes 2255 // any type qualifiers, the element type is so qualified, not the array type." 2256 2257 // If we get here, we either have type qualifiers on the type, or we have 2258 // sugar such as a typedef in the way. If we have type qualifiers on the type 2259 // we must propagate them down into the element type. 2260 unsigned CVRQuals = T.getCVRQualifiers(); 2261 unsigned AddrSpace = 0; 2262 Type *Ty = T.getTypePtr(); 2263 2264 // Rip through ExtQualType's and typedefs to get to a concrete type. 2265 while (1) { 2266 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 2267 AddrSpace = EXTQT->getAddressSpace(); 2268 Ty = EXTQT->getBaseType(); 2269 } else { 2270 T = Ty->getDesugaredType(); 2271 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 2272 break; 2273 CVRQuals |= T.getCVRQualifiers(); 2274 Ty = T.getTypePtr(); 2275 } 2276 } 2277 2278 // If we have a simple case, just return now. 2279 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2280 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 2281 return ATy; 2282 2283 // Otherwise, we have an array and we have qualifiers on it. Push the 2284 // qualifiers into the array element type and return a new array type. 2285 // Get the canonical version of the element with the extra qualifiers on it. 2286 // This can recursively sink qualifiers through multiple levels of arrays. 2287 QualType NewEltTy = ATy->getElementType(); 2288 if (AddrSpace) 2289 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 2290 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 2291 2292 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2293 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2294 CAT->getSizeModifier(), 2295 CAT->getIndexTypeQualifier())); 2296 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2297 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2298 IAT->getSizeModifier(), 2299 IAT->getIndexTypeQualifier())); 2300 2301 if (const DependentSizedArrayType *DSAT 2302 = dyn_cast<DependentSizedArrayType>(ATy)) 2303 return cast<ArrayType>( 2304 getDependentSizedArrayType(NewEltTy, 2305 DSAT->getSizeExpr(), 2306 DSAT->getSizeModifier(), 2307 DSAT->getIndexTypeQualifier(), 2308 DSAT->getBracketsRange())); 2309 2310 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2311 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2312 VAT->getSizeExpr(), 2313 VAT->getSizeModifier(), 2314 VAT->getIndexTypeQualifier(), 2315 VAT->getBracketsRange())); 2316} 2317 2318 2319/// getArrayDecayedType - Return the properly qualified result of decaying the 2320/// specified array type to a pointer. This operation is non-trivial when 2321/// handling typedefs etc. The canonical type of "T" must be an array type, 2322/// this returns a pointer to a properly qualified element of the array. 2323/// 2324/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2325QualType ASTContext::getArrayDecayedType(QualType Ty) { 2326 // Get the element type with 'getAsArrayType' so that we don't lose any 2327 // typedefs in the element type of the array. This also handles propagation 2328 // of type qualifiers from the array type into the element type if present 2329 // (C99 6.7.3p8). 2330 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2331 assert(PrettyArrayType && "Not an array type!"); 2332 2333 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2334 2335 // int x[restrict 4] -> int *restrict 2336 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 2337} 2338 2339QualType ASTContext::getBaseElementType(QualType QT) { 2340 QualifierSet qualifiers; 2341 while (true) { 2342 const Type *UT = qualifiers.strip(QT); 2343 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2344 QT = AT->getElementType(); 2345 } else { 2346 return qualifiers.apply(QT, *this); 2347 } 2348 } 2349} 2350 2351QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 2352 QualType ElemTy = VAT->getElementType(); 2353 2354 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 2355 return getBaseElementType(VAT); 2356 2357 return ElemTy; 2358} 2359 2360/// getFloatingRank - Return a relative rank for floating point types. 2361/// This routine will assert if passed a built-in type that isn't a float. 2362static FloatingRank getFloatingRank(QualType T) { 2363 if (const ComplexType *CT = T->getAsComplexType()) 2364 return getFloatingRank(CT->getElementType()); 2365 2366 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 2367 switch (T->getAsBuiltinType()->getKind()) { 2368 default: assert(0 && "getFloatingRank(): not a floating type"); 2369 case BuiltinType::Float: return FloatRank; 2370 case BuiltinType::Double: return DoubleRank; 2371 case BuiltinType::LongDouble: return LongDoubleRank; 2372 } 2373} 2374 2375/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2376/// point or a complex type (based on typeDomain/typeSize). 2377/// 'typeDomain' is a real floating point or complex type. 2378/// 'typeSize' is a real floating point or complex type. 2379QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2380 QualType Domain) const { 2381 FloatingRank EltRank = getFloatingRank(Size); 2382 if (Domain->isComplexType()) { 2383 switch (EltRank) { 2384 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2385 case FloatRank: return FloatComplexTy; 2386 case DoubleRank: return DoubleComplexTy; 2387 case LongDoubleRank: return LongDoubleComplexTy; 2388 } 2389 } 2390 2391 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2392 switch (EltRank) { 2393 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2394 case FloatRank: return FloatTy; 2395 case DoubleRank: return DoubleTy; 2396 case LongDoubleRank: return LongDoubleTy; 2397 } 2398} 2399 2400/// getFloatingTypeOrder - Compare the rank of the two specified floating 2401/// point types, ignoring the domain of the type (i.e. 'double' == 2402/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2403/// LHS < RHS, return -1. 2404int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2405 FloatingRank LHSR = getFloatingRank(LHS); 2406 FloatingRank RHSR = getFloatingRank(RHS); 2407 2408 if (LHSR == RHSR) 2409 return 0; 2410 if (LHSR > RHSR) 2411 return 1; 2412 return -1; 2413} 2414 2415/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2416/// routine will assert if passed a built-in type that isn't an integer or enum, 2417/// or if it is not canonicalized. 2418unsigned ASTContext::getIntegerRank(Type *T) { 2419 assert(T->isCanonical() && "T should be canonicalized"); 2420 if (EnumType* ET = dyn_cast<EnumType>(T)) 2421 T = ET->getDecl()->getIntegerType().getTypePtr(); 2422 2423 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2424 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2425 2426 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2427 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2428 2429 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2430 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2431 2432 // There are two things which impact the integer rank: the width, and 2433 // the ordering of builtins. The builtin ordering is encoded in the 2434 // bottom three bits; the width is encoded in the bits above that. 2435 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2436 return FWIT->getWidth() << 3; 2437 2438 switch (cast<BuiltinType>(T)->getKind()) { 2439 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2440 case BuiltinType::Bool: 2441 return 1 + (getIntWidth(BoolTy) << 3); 2442 case BuiltinType::Char_S: 2443 case BuiltinType::Char_U: 2444 case BuiltinType::SChar: 2445 case BuiltinType::UChar: 2446 return 2 + (getIntWidth(CharTy) << 3); 2447 case BuiltinType::Short: 2448 case BuiltinType::UShort: 2449 return 3 + (getIntWidth(ShortTy) << 3); 2450 case BuiltinType::Int: 2451 case BuiltinType::UInt: 2452 return 4 + (getIntWidth(IntTy) << 3); 2453 case BuiltinType::Long: 2454 case BuiltinType::ULong: 2455 return 5 + (getIntWidth(LongTy) << 3); 2456 case BuiltinType::LongLong: 2457 case BuiltinType::ULongLong: 2458 return 6 + (getIntWidth(LongLongTy) << 3); 2459 case BuiltinType::Int128: 2460 case BuiltinType::UInt128: 2461 return 7 + (getIntWidth(Int128Ty) << 3); 2462 } 2463} 2464 2465/// getIntegerTypeOrder - Returns the highest ranked integer type: 2466/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2467/// LHS < RHS, return -1. 2468int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2469 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2470 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2471 if (LHSC == RHSC) return 0; 2472 2473 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2474 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2475 2476 unsigned LHSRank = getIntegerRank(LHSC); 2477 unsigned RHSRank = getIntegerRank(RHSC); 2478 2479 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2480 if (LHSRank == RHSRank) return 0; 2481 return LHSRank > RHSRank ? 1 : -1; 2482 } 2483 2484 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2485 if (LHSUnsigned) { 2486 // If the unsigned [LHS] type is larger, return it. 2487 if (LHSRank >= RHSRank) 2488 return 1; 2489 2490 // If the signed type can represent all values of the unsigned type, it 2491 // wins. Because we are dealing with 2's complement and types that are 2492 // powers of two larger than each other, this is always safe. 2493 return -1; 2494 } 2495 2496 // If the unsigned [RHS] type is larger, return it. 2497 if (RHSRank >= LHSRank) 2498 return -1; 2499 2500 // If the signed type can represent all values of the unsigned type, it 2501 // wins. Because we are dealing with 2's complement and types that are 2502 // powers of two larger than each other, this is always safe. 2503 return 1; 2504} 2505 2506// getCFConstantStringType - Return the type used for constant CFStrings. 2507QualType ASTContext::getCFConstantStringType() { 2508 if (!CFConstantStringTypeDecl) { 2509 CFConstantStringTypeDecl = 2510 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2511 &Idents.get("NSConstantString")); 2512 QualType FieldTypes[4]; 2513 2514 // const int *isa; 2515 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2516 // int flags; 2517 FieldTypes[1] = IntTy; 2518 // const char *str; 2519 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2520 // long length; 2521 FieldTypes[3] = LongTy; 2522 2523 // Create fields 2524 for (unsigned i = 0; i < 4; ++i) { 2525 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2526 SourceLocation(), 0, 2527 FieldTypes[i], /*BitWidth=*/0, 2528 /*Mutable=*/false); 2529 CFConstantStringTypeDecl->addDecl(Field); 2530 } 2531 2532 CFConstantStringTypeDecl->completeDefinition(*this); 2533 } 2534 2535 return getTagDeclType(CFConstantStringTypeDecl); 2536} 2537 2538void ASTContext::setCFConstantStringType(QualType T) { 2539 const RecordType *Rec = T->getAs<RecordType>(); 2540 assert(Rec && "Invalid CFConstantStringType"); 2541 CFConstantStringTypeDecl = Rec->getDecl(); 2542} 2543 2544QualType ASTContext::getObjCFastEnumerationStateType() 2545{ 2546 if (!ObjCFastEnumerationStateTypeDecl) { 2547 ObjCFastEnumerationStateTypeDecl = 2548 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2549 &Idents.get("__objcFastEnumerationState")); 2550 2551 QualType FieldTypes[] = { 2552 UnsignedLongTy, 2553 getPointerType(ObjCIdTypedefType), 2554 getPointerType(UnsignedLongTy), 2555 getConstantArrayType(UnsignedLongTy, 2556 llvm::APInt(32, 5), ArrayType::Normal, 0) 2557 }; 2558 2559 for (size_t i = 0; i < 4; ++i) { 2560 FieldDecl *Field = FieldDecl::Create(*this, 2561 ObjCFastEnumerationStateTypeDecl, 2562 SourceLocation(), 0, 2563 FieldTypes[i], /*BitWidth=*/0, 2564 /*Mutable=*/false); 2565 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2566 } 2567 2568 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2569 } 2570 2571 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2572} 2573 2574void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2575 const RecordType *Rec = T->getAs<RecordType>(); 2576 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2577 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2578} 2579 2580// This returns true if a type has been typedefed to BOOL: 2581// typedef <type> BOOL; 2582static bool isTypeTypedefedAsBOOL(QualType T) { 2583 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2584 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2585 return II->isStr("BOOL"); 2586 2587 return false; 2588} 2589 2590/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2591/// purpose. 2592int ASTContext::getObjCEncodingTypeSize(QualType type) { 2593 uint64_t sz = getTypeSize(type); 2594 2595 // Make all integer and enum types at least as large as an int 2596 if (sz > 0 && type->isIntegralType()) 2597 sz = std::max(sz, getTypeSize(IntTy)); 2598 // Treat arrays as pointers, since that's how they're passed in. 2599 else if (type->isArrayType()) 2600 sz = getTypeSize(VoidPtrTy); 2601 return sz / getTypeSize(CharTy); 2602} 2603 2604/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2605/// declaration. 2606void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2607 std::string& S) { 2608 // FIXME: This is not very efficient. 2609 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2610 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2611 // Encode result type. 2612 getObjCEncodingForType(Decl->getResultType(), S); 2613 // Compute size of all parameters. 2614 // Start with computing size of a pointer in number of bytes. 2615 // FIXME: There might(should) be a better way of doing this computation! 2616 SourceLocation Loc; 2617 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2618 // The first two arguments (self and _cmd) are pointers; account for 2619 // their size. 2620 int ParmOffset = 2 * PtrSize; 2621 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2622 E = Decl->param_end(); PI != E; ++PI) { 2623 QualType PType = (*PI)->getType(); 2624 int sz = getObjCEncodingTypeSize(PType); 2625 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2626 ParmOffset += sz; 2627 } 2628 S += llvm::utostr(ParmOffset); 2629 S += "@0:"; 2630 S += llvm::utostr(PtrSize); 2631 2632 // Argument types. 2633 ParmOffset = 2 * PtrSize; 2634 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2635 E = Decl->param_end(); PI != E; ++PI) { 2636 ParmVarDecl *PVDecl = *PI; 2637 QualType PType = PVDecl->getOriginalType(); 2638 if (const ArrayType *AT = 2639 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2640 // Use array's original type only if it has known number of 2641 // elements. 2642 if (!isa<ConstantArrayType>(AT)) 2643 PType = PVDecl->getType(); 2644 } else if (PType->isFunctionType()) 2645 PType = PVDecl->getType(); 2646 // Process argument qualifiers for user supplied arguments; such as, 2647 // 'in', 'inout', etc. 2648 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2649 getObjCEncodingForType(PType, S); 2650 S += llvm::utostr(ParmOffset); 2651 ParmOffset += getObjCEncodingTypeSize(PType); 2652 } 2653} 2654 2655/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2656/// property declaration. If non-NULL, Container must be either an 2657/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2658/// NULL when getting encodings for protocol properties. 2659/// Property attributes are stored as a comma-delimited C string. The simple 2660/// attributes readonly and bycopy are encoded as single characters. The 2661/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2662/// encoded as single characters, followed by an identifier. Property types 2663/// are also encoded as a parametrized attribute. The characters used to encode 2664/// these attributes are defined by the following enumeration: 2665/// @code 2666/// enum PropertyAttributes { 2667/// kPropertyReadOnly = 'R', // property is read-only. 2668/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2669/// kPropertyByref = '&', // property is a reference to the value last assigned 2670/// kPropertyDynamic = 'D', // property is dynamic 2671/// kPropertyGetter = 'G', // followed by getter selector name 2672/// kPropertySetter = 'S', // followed by setter selector name 2673/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2674/// kPropertyType = 't' // followed by old-style type encoding. 2675/// kPropertyWeak = 'W' // 'weak' property 2676/// kPropertyStrong = 'P' // property GC'able 2677/// kPropertyNonAtomic = 'N' // property non-atomic 2678/// }; 2679/// @endcode 2680void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2681 const Decl *Container, 2682 std::string& S) { 2683 // Collect information from the property implementation decl(s). 2684 bool Dynamic = false; 2685 ObjCPropertyImplDecl *SynthesizePID = 0; 2686 2687 // FIXME: Duplicated code due to poor abstraction. 2688 if (Container) { 2689 if (const ObjCCategoryImplDecl *CID = 2690 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2691 for (ObjCCategoryImplDecl::propimpl_iterator 2692 i = CID->propimpl_begin(), e = CID->propimpl_end(); 2693 i != e; ++i) { 2694 ObjCPropertyImplDecl *PID = *i; 2695 if (PID->getPropertyDecl() == PD) { 2696 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2697 Dynamic = true; 2698 } else { 2699 SynthesizePID = PID; 2700 } 2701 } 2702 } 2703 } else { 2704 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2705 for (ObjCCategoryImplDecl::propimpl_iterator 2706 i = OID->propimpl_begin(), e = OID->propimpl_end(); 2707 i != e; ++i) { 2708 ObjCPropertyImplDecl *PID = *i; 2709 if (PID->getPropertyDecl() == PD) { 2710 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2711 Dynamic = true; 2712 } else { 2713 SynthesizePID = PID; 2714 } 2715 } 2716 } 2717 } 2718 } 2719 2720 // FIXME: This is not very efficient. 2721 S = "T"; 2722 2723 // Encode result type. 2724 // GCC has some special rules regarding encoding of properties which 2725 // closely resembles encoding of ivars. 2726 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2727 true /* outermost type */, 2728 true /* encoding for property */); 2729 2730 if (PD->isReadOnly()) { 2731 S += ",R"; 2732 } else { 2733 switch (PD->getSetterKind()) { 2734 case ObjCPropertyDecl::Assign: break; 2735 case ObjCPropertyDecl::Copy: S += ",C"; break; 2736 case ObjCPropertyDecl::Retain: S += ",&"; break; 2737 } 2738 } 2739 2740 // It really isn't clear at all what this means, since properties 2741 // are "dynamic by default". 2742 if (Dynamic) 2743 S += ",D"; 2744 2745 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2746 S += ",N"; 2747 2748 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2749 S += ",G"; 2750 S += PD->getGetterName().getAsString(); 2751 } 2752 2753 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2754 S += ",S"; 2755 S += PD->getSetterName().getAsString(); 2756 } 2757 2758 if (SynthesizePID) { 2759 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2760 S += ",V"; 2761 S += OID->getNameAsString(); 2762 } 2763 2764 // FIXME: OBJCGC: weak & strong 2765} 2766 2767/// getLegacyIntegralTypeEncoding - 2768/// Another legacy compatibility encoding: 32-bit longs are encoded as 2769/// 'l' or 'L' , but not always. For typedefs, we need to use 2770/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2771/// 2772void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2773 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 2774 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2775 if (BT->getKind() == BuiltinType::ULong && 2776 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2777 PointeeTy = UnsignedIntTy; 2778 else 2779 if (BT->getKind() == BuiltinType::Long && 2780 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2781 PointeeTy = IntTy; 2782 } 2783 } 2784} 2785 2786void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2787 const FieldDecl *Field) { 2788 // We follow the behavior of gcc, expanding structures which are 2789 // directly pointed to, and expanding embedded structures. Note that 2790 // these rules are sufficient to prevent recursive encoding of the 2791 // same type. 2792 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2793 true /* outermost type */); 2794} 2795 2796static void EncodeBitField(const ASTContext *Context, std::string& S, 2797 const FieldDecl *FD) { 2798 const Expr *E = FD->getBitWidth(); 2799 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2800 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2801 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2802 S += 'b'; 2803 S += llvm::utostr(N); 2804} 2805 2806void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2807 bool ExpandPointedToStructures, 2808 bool ExpandStructures, 2809 const FieldDecl *FD, 2810 bool OutermostType, 2811 bool EncodingProperty) { 2812 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2813 if (FD && FD->isBitField()) 2814 return EncodeBitField(this, S, FD); 2815 char encoding; 2816 switch (BT->getKind()) { 2817 default: assert(0 && "Unhandled builtin type kind"); 2818 case BuiltinType::Void: encoding = 'v'; break; 2819 case BuiltinType::Bool: encoding = 'B'; break; 2820 case BuiltinType::Char_U: 2821 case BuiltinType::UChar: encoding = 'C'; break; 2822 case BuiltinType::UShort: encoding = 'S'; break; 2823 case BuiltinType::UInt: encoding = 'I'; break; 2824 case BuiltinType::ULong: 2825 encoding = 2826 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2827 break; 2828 case BuiltinType::UInt128: encoding = 'T'; break; 2829 case BuiltinType::ULongLong: encoding = 'Q'; break; 2830 case BuiltinType::Char_S: 2831 case BuiltinType::SChar: encoding = 'c'; break; 2832 case BuiltinType::Short: encoding = 's'; break; 2833 case BuiltinType::Int: encoding = 'i'; break; 2834 case BuiltinType::Long: 2835 encoding = 2836 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2837 break; 2838 case BuiltinType::LongLong: encoding = 'q'; break; 2839 case BuiltinType::Int128: encoding = 't'; break; 2840 case BuiltinType::Float: encoding = 'f'; break; 2841 case BuiltinType::Double: encoding = 'd'; break; 2842 case BuiltinType::LongDouble: encoding = 'd'; break; 2843 } 2844 2845 S += encoding; 2846 return; 2847 } 2848 2849 if (const ComplexType *CT = T->getAsComplexType()) { 2850 S += 'j'; 2851 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2852 false); 2853 return; 2854 } 2855 2856 if (const PointerType *PT = T->getAs<PointerType>()) { 2857 QualType PointeeTy = PT->getPointeeType(); 2858 bool isReadOnly = false; 2859 // For historical/compatibility reasons, the read-only qualifier of the 2860 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2861 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2862 // Also, do not emit the 'r' for anything but the outermost type! 2863 if (isa<TypedefType>(T.getTypePtr())) { 2864 if (OutermostType && T.isConstQualified()) { 2865 isReadOnly = true; 2866 S += 'r'; 2867 } 2868 } else if (OutermostType) { 2869 QualType P = PointeeTy; 2870 while (P->getAs<PointerType>()) 2871 P = P->getAs<PointerType>()->getPointeeType(); 2872 if (P.isConstQualified()) { 2873 isReadOnly = true; 2874 S += 'r'; 2875 } 2876 } 2877 if (isReadOnly) { 2878 // Another legacy compatibility encoding. Some ObjC qualifier and type 2879 // combinations need to be rearranged. 2880 // Rewrite "in const" from "nr" to "rn" 2881 const char * s = S.c_str(); 2882 int len = S.length(); 2883 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2884 std::string replace = "rn"; 2885 S.replace(S.end()-2, S.end(), replace); 2886 } 2887 } 2888 if (isObjCSelType(PointeeTy)) { 2889 S += ':'; 2890 return; 2891 } 2892 2893 if (PointeeTy->isCharType()) { 2894 // char pointer types should be encoded as '*' unless it is a 2895 // type that has been typedef'd to 'BOOL'. 2896 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 2897 S += '*'; 2898 return; 2899 } 2900 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 2901 // GCC binary compat: Need to convert "struct objc_class *" to "#". 2902 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 2903 S += '#'; 2904 return; 2905 } 2906 // GCC binary compat: Need to convert "struct objc_object *" to "@". 2907 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 2908 S += '@'; 2909 return; 2910 } 2911 // fall through... 2912 } 2913 S += '^'; 2914 getLegacyIntegralTypeEncoding(PointeeTy); 2915 2916 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 2917 NULL); 2918 return; 2919 } 2920 2921 if (const ArrayType *AT = 2922 // Ignore type qualifiers etc. 2923 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 2924 if (isa<IncompleteArrayType>(AT)) { 2925 // Incomplete arrays are encoded as a pointer to the array element. 2926 S += '^'; 2927 2928 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2929 false, ExpandStructures, FD); 2930 } else { 2931 S += '['; 2932 2933 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2934 S += llvm::utostr(CAT->getSize().getZExtValue()); 2935 else { 2936 //Variable length arrays are encoded as a regular array with 0 elements. 2937 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 2938 S += '0'; 2939 } 2940 2941 getObjCEncodingForTypeImpl(AT->getElementType(), S, 2942 false, ExpandStructures, FD); 2943 S += ']'; 2944 } 2945 return; 2946 } 2947 2948 if (T->getAsFunctionType()) { 2949 S += '?'; 2950 return; 2951 } 2952 2953 if (const RecordType *RTy = T->getAs<RecordType>()) { 2954 RecordDecl *RDecl = RTy->getDecl(); 2955 S += RDecl->isUnion() ? '(' : '{'; 2956 // Anonymous structures print as '?' 2957 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 2958 S += II->getName(); 2959 } else { 2960 S += '?'; 2961 } 2962 if (ExpandStructures) { 2963 S += '='; 2964 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 2965 FieldEnd = RDecl->field_end(); 2966 Field != FieldEnd; ++Field) { 2967 if (FD) { 2968 S += '"'; 2969 S += Field->getNameAsString(); 2970 S += '"'; 2971 } 2972 2973 // Special case bit-fields. 2974 if (Field->isBitField()) { 2975 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 2976 (*Field)); 2977 } else { 2978 QualType qt = Field->getType(); 2979 getLegacyIntegralTypeEncoding(qt); 2980 getObjCEncodingForTypeImpl(qt, S, false, true, 2981 FD); 2982 } 2983 } 2984 } 2985 S += RDecl->isUnion() ? ')' : '}'; 2986 return; 2987 } 2988 2989 if (T->isEnumeralType()) { 2990 if (FD && FD->isBitField()) 2991 EncodeBitField(this, S, FD); 2992 else 2993 S += 'i'; 2994 return; 2995 } 2996 2997 if (T->isBlockPointerType()) { 2998 S += "@?"; // Unlike a pointer-to-function, which is "^?". 2999 return; 3000 } 3001 3002 if (T->isObjCInterfaceType()) { 3003 // @encode(class_name) 3004 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 3005 S += '{'; 3006 const IdentifierInfo *II = OI->getIdentifier(); 3007 S += II->getName(); 3008 S += '='; 3009 llvm::SmallVector<FieldDecl*, 32> RecFields; 3010 CollectObjCIvars(OI, RecFields); 3011 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3012 if (RecFields[i]->isBitField()) 3013 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3014 RecFields[i]); 3015 else 3016 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3017 FD); 3018 } 3019 S += '}'; 3020 return; 3021 } 3022 3023 if (const ObjCObjectPointerType *OPT = T->getAsObjCObjectPointerType()) { 3024 if (OPT->isObjCIdType()) { 3025 S += '@'; 3026 return; 3027 } 3028 3029 if (OPT->isObjCClassType()) { 3030 S += '#'; 3031 return; 3032 } 3033 3034 if (OPT->isObjCQualifiedIdType()) { 3035 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3036 ExpandPointedToStructures, 3037 ExpandStructures, FD); 3038 if (FD || EncodingProperty) { 3039 // Note that we do extended encoding of protocol qualifer list 3040 // Only when doing ivar or property encoding. 3041 S += '"'; 3042 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3043 E = OPT->qual_end(); I != E; ++I) { 3044 S += '<'; 3045 S += (*I)->getNameAsString(); 3046 S += '>'; 3047 } 3048 S += '"'; 3049 } 3050 return; 3051 } 3052 3053 QualType PointeeTy = OPT->getPointeeType(); 3054 if (!EncodingProperty && 3055 isa<TypedefType>(PointeeTy.getTypePtr())) { 3056 // Another historical/compatibility reason. 3057 // We encode the underlying type which comes out as 3058 // {...}; 3059 S += '^'; 3060 getObjCEncodingForTypeImpl(PointeeTy, S, 3061 false, ExpandPointedToStructures, 3062 NULL); 3063 return; 3064 } 3065 3066 S += '@'; 3067 if (FD || EncodingProperty) { 3068 S += '"'; 3069 S += OPT->getInterfaceDecl()->getNameAsCString(); 3070 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3071 E = OPT->qual_end(); I != E; ++I) { 3072 S += '<'; 3073 S += (*I)->getNameAsString(); 3074 S += '>'; 3075 } 3076 S += '"'; 3077 } 3078 return; 3079 } 3080 3081 assert(0 && "@encode for type not implemented!"); 3082} 3083 3084void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3085 std::string& S) const { 3086 if (QT & Decl::OBJC_TQ_In) 3087 S += 'n'; 3088 if (QT & Decl::OBJC_TQ_Inout) 3089 S += 'N'; 3090 if (QT & Decl::OBJC_TQ_Out) 3091 S += 'o'; 3092 if (QT & Decl::OBJC_TQ_Bycopy) 3093 S += 'O'; 3094 if (QT & Decl::OBJC_TQ_Byref) 3095 S += 'R'; 3096 if (QT & Decl::OBJC_TQ_Oneway) 3097 S += 'V'; 3098} 3099 3100void ASTContext::setBuiltinVaListType(QualType T) { 3101 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3102 3103 BuiltinVaListType = T; 3104} 3105 3106void ASTContext::setObjCIdType(QualType T) { 3107 ObjCIdTypedefType = T; 3108} 3109 3110void ASTContext::setObjCSelType(QualType T) { 3111 ObjCSelType = T; 3112 3113 const TypedefType *TT = T->getAsTypedefType(); 3114 if (!TT) 3115 return; 3116 TypedefDecl *TD = TT->getDecl(); 3117 3118 // typedef struct objc_selector *SEL; 3119 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3120 if (!ptr) 3121 return; 3122 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3123 if (!rec) 3124 return; 3125 SelStructType = rec; 3126} 3127 3128void ASTContext::setObjCProtoType(QualType QT) { 3129 ObjCProtoType = QT; 3130} 3131 3132void ASTContext::setObjCClassType(QualType T) { 3133 ObjCClassTypedefType = T; 3134} 3135 3136void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3137 assert(ObjCConstantStringType.isNull() && 3138 "'NSConstantString' type already set!"); 3139 3140 ObjCConstantStringType = getObjCInterfaceType(Decl); 3141} 3142 3143/// \brief Retrieve the template name that represents a qualified 3144/// template name such as \c std::vector. 3145TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3146 bool TemplateKeyword, 3147 TemplateDecl *Template) { 3148 llvm::FoldingSetNodeID ID; 3149 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3150 3151 void *InsertPos = 0; 3152 QualifiedTemplateName *QTN = 3153 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3154 if (!QTN) { 3155 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3156 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3157 } 3158 3159 return TemplateName(QTN); 3160} 3161 3162/// \brief Retrieve the template name that represents a qualified 3163/// template name such as \c std::vector. 3164TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3165 bool TemplateKeyword, 3166 OverloadedFunctionDecl *Template) { 3167 llvm::FoldingSetNodeID ID; 3168 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3169 3170 void *InsertPos = 0; 3171 QualifiedTemplateName *QTN = 3172 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3173 if (!QTN) { 3174 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3175 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3176 } 3177 3178 return TemplateName(QTN); 3179} 3180 3181/// \brief Retrieve the template name that represents a dependent 3182/// template name such as \c MetaFun::template apply. 3183TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3184 const IdentifierInfo *Name) { 3185 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 3186 3187 llvm::FoldingSetNodeID ID; 3188 DependentTemplateName::Profile(ID, NNS, Name); 3189 3190 void *InsertPos = 0; 3191 DependentTemplateName *QTN = 3192 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3193 3194 if (QTN) 3195 return TemplateName(QTN); 3196 3197 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3198 if (CanonNNS == NNS) { 3199 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3200 } else { 3201 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3202 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3203 } 3204 3205 DependentTemplateNames.InsertNode(QTN, InsertPos); 3206 return TemplateName(QTN); 3207} 3208 3209/// getFromTargetType - Given one of the integer types provided by 3210/// TargetInfo, produce the corresponding type. The unsigned @p Type 3211/// is actually a value of type @c TargetInfo::IntType. 3212QualType ASTContext::getFromTargetType(unsigned Type) const { 3213 switch (Type) { 3214 case TargetInfo::NoInt: return QualType(); 3215 case TargetInfo::SignedShort: return ShortTy; 3216 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3217 case TargetInfo::SignedInt: return IntTy; 3218 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3219 case TargetInfo::SignedLong: return LongTy; 3220 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3221 case TargetInfo::SignedLongLong: return LongLongTy; 3222 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3223 } 3224 3225 assert(false && "Unhandled TargetInfo::IntType value"); 3226 return QualType(); 3227} 3228 3229//===----------------------------------------------------------------------===// 3230// Type Predicates. 3231//===----------------------------------------------------------------------===// 3232 3233/// isObjCNSObjectType - Return true if this is an NSObject object using 3234/// NSObject attribute on a c-style pointer type. 3235/// FIXME - Make it work directly on types. 3236/// FIXME: Move to Type. 3237/// 3238bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3239 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3240 if (TypedefDecl *TD = TDT->getDecl()) 3241 if (TD->getAttr<ObjCNSObjectAttr>()) 3242 return true; 3243 } 3244 return false; 3245} 3246 3247/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3248/// garbage collection attribute. 3249/// 3250QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3251 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 3252 if (getLangOptions().ObjC1 && 3253 getLangOptions().getGCMode() != LangOptions::NonGC) { 3254 GCAttrs = Ty.getObjCGCAttr(); 3255 // Default behavious under objective-c's gc is for objective-c pointers 3256 // (or pointers to them) be treated as though they were declared 3257 // as __strong. 3258 if (GCAttrs == QualType::GCNone) { 3259 if (Ty->isObjCObjectPointerType()) 3260 GCAttrs = QualType::Strong; 3261 else if (Ty->isPointerType()) 3262 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3263 } 3264 // Non-pointers have none gc'able attribute regardless of the attribute 3265 // set on them. 3266 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3267 return QualType::GCNone; 3268 } 3269 return GCAttrs; 3270} 3271 3272//===----------------------------------------------------------------------===// 3273// Type Compatibility Testing 3274//===----------------------------------------------------------------------===// 3275 3276/// areCompatVectorTypes - Return true if the two specified vector types are 3277/// compatible. 3278static bool areCompatVectorTypes(const VectorType *LHS, 3279 const VectorType *RHS) { 3280 assert(LHS->isCanonical() && RHS->isCanonical()); 3281 return LHS->getElementType() == RHS->getElementType() && 3282 LHS->getNumElements() == RHS->getNumElements(); 3283} 3284 3285//===----------------------------------------------------------------------===// 3286// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3287//===----------------------------------------------------------------------===// 3288 3289/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3290/// inheritance hierarchy of 'rProto'. 3291static bool ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3292 ObjCProtocolDecl *rProto) { 3293 if (lProto == rProto) 3294 return true; 3295 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3296 E = rProto->protocol_end(); PI != E; ++PI) 3297 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3298 return true; 3299 return false; 3300} 3301 3302/// ClassImplementsProtocol - Checks that 'lProto' protocol 3303/// has been implemented in IDecl class, its super class or categories (if 3304/// lookupCategory is true). 3305static bool ClassImplementsProtocol(ObjCProtocolDecl *lProto, 3306 ObjCInterfaceDecl *IDecl, 3307 bool lookupCategory, 3308 bool RHSIsQualifiedID = false) { 3309 3310 // 1st, look up the class. 3311 const ObjCList<ObjCProtocolDecl> &Protocols = 3312 IDecl->getReferencedProtocols(); 3313 3314 for (ObjCList<ObjCProtocolDecl>::iterator PI = Protocols.begin(), 3315 E = Protocols.end(); PI != E; ++PI) { 3316 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3317 return true; 3318 // This is dubious and is added to be compatible with gcc. In gcc, it is 3319 // also allowed assigning a protocol-qualified 'id' type to a LHS object 3320 // when protocol in qualified LHS is in list of protocols in the rhs 'id' 3321 // object. This IMO, should be a bug. 3322 // FIXME: Treat this as an extension, and flag this as an error when GCC 3323 // extensions are not enabled. 3324 if (RHSIsQualifiedID && ProtocolCompatibleWithProtocol(*PI, lProto)) 3325 return true; 3326 } 3327 3328 // 2nd, look up the category. 3329 if (lookupCategory) 3330 for (ObjCCategoryDecl *CDecl = IDecl->getCategoryList(); CDecl; 3331 CDecl = CDecl->getNextClassCategory()) { 3332 for (ObjCCategoryDecl::protocol_iterator PI = CDecl->protocol_begin(), 3333 E = CDecl->protocol_end(); PI != E; ++PI) 3334 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3335 return true; 3336 } 3337 3338 // 3rd, look up the super class(s) 3339 if (IDecl->getSuperClass()) 3340 return 3341 ClassImplementsProtocol(lProto, IDecl->getSuperClass(), lookupCategory, 3342 RHSIsQualifiedID); 3343 3344 return false; 3345} 3346 3347/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3348/// return true if lhs's protocols conform to rhs's protocol; false 3349/// otherwise. 3350bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3351 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3352 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3353 return false; 3354} 3355 3356/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3357/// ObjCQualifiedIDType. 3358bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3359 bool compare) { 3360 // Allow id<P..> and an 'id' or void* type in all cases. 3361 if (lhs->isVoidPointerType() || 3362 lhs->isObjCIdType() || lhs->isObjCClassType()) 3363 return true; 3364 else if (rhs->isVoidPointerType() || 3365 rhs->isObjCIdType() || rhs->isObjCClassType()) 3366 return true; 3367 3368 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3369 const ObjCObjectPointerType *rhsOPT = rhs->getAsObjCObjectPointerType(); 3370 3371 if (!rhsOPT) return false; 3372 3373 if (rhsOPT->qual_empty()) { 3374 // If the RHS is a unqualified interface pointer "NSString*", 3375 // make sure we check the class hierarchy. 3376 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3377 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3378 E = lhsQID->qual_end(); I != E; ++I) { 3379 // when comparing an id<P> on lhs with a static type on rhs, 3380 // see if static class implements all of id's protocols, directly or 3381 // through its super class and categories. 3382 if (!ClassImplementsProtocol(*I, rhsID, true)) 3383 return false; 3384 } 3385 } 3386 // If there are no qualifiers and no interface, we have an 'id'. 3387 return true; 3388 } 3389 // Both the right and left sides have qualifiers. 3390 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3391 E = lhsQID->qual_end(); I != E; ++I) { 3392 ObjCProtocolDecl *lhsProto = *I; 3393 bool match = false; 3394 3395 // when comparing an id<P> on lhs with a static type on rhs, 3396 // see if static class implements all of id's protocols, directly or 3397 // through its super class and categories. 3398 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3399 E = rhsOPT->qual_end(); J != E; ++J) { 3400 ObjCProtocolDecl *rhsProto = *J; 3401 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3402 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3403 match = true; 3404 break; 3405 } 3406 } 3407 // If the RHS is a qualified interface pointer "NSString<P>*", 3408 // make sure we check the class hierarchy. 3409 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3410 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3411 E = lhsQID->qual_end(); I != E; ++I) { 3412 // when comparing an id<P> on lhs with a static type on rhs, 3413 // see if static class implements all of id's protocols, directly or 3414 // through its super class and categories. 3415 if (ClassImplementsProtocol(*I, rhsID, true)) { 3416 match = true; 3417 break; 3418 } 3419 } 3420 } 3421 if (!match) 3422 return false; 3423 } 3424 3425 return true; 3426 } 3427 3428 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3429 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3430 3431 if (const ObjCObjectPointerType *lhsOPT = 3432 lhs->getAsObjCInterfacePointerType()) { 3433 if (lhsOPT->qual_empty()) { 3434 bool match = false; 3435 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3436 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3437 E = rhsQID->qual_end(); I != E; ++I) { 3438 // when comparing an id<P> on lhs with a static type on rhs, 3439 // see if static class implements all of id's protocols, directly or 3440 // through its super class and categories. 3441 if (ClassImplementsProtocol(*I, lhsID, true)) { 3442 match = true; 3443 break; 3444 } 3445 } 3446 if (!match) 3447 return false; 3448 } 3449 return true; 3450 } 3451 // Both the right and left sides have qualifiers. 3452 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3453 E = lhsOPT->qual_end(); I != E; ++I) { 3454 ObjCProtocolDecl *lhsProto = *I; 3455 bool match = false; 3456 3457 // when comparing an id<P> on lhs with a static type on rhs, 3458 // see if static class implements all of id's protocols, directly or 3459 // through its super class and categories. 3460 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3461 E = rhsQID->qual_end(); J != E; ++J) { 3462 ObjCProtocolDecl *rhsProto = *J; 3463 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3464 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3465 match = true; 3466 break; 3467 } 3468 } 3469 if (!match) 3470 return false; 3471 } 3472 return true; 3473 } 3474 return false; 3475} 3476 3477/// canAssignObjCInterfaces - Return true if the two interface types are 3478/// compatible for assignment from RHS to LHS. This handles validation of any 3479/// protocol qualifiers on the LHS or RHS. 3480/// 3481bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3482 const ObjCObjectPointerType *RHSOPT) { 3483 // If either type represents the built-in 'id' or 'Class' types, return true. 3484 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3485 return true; 3486 3487 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3488 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3489 QualType(RHSOPT,0), 3490 false); 3491 3492 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3493 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3494 if (LHS && RHS) // We have 2 user-defined types. 3495 return canAssignObjCInterfaces(LHS, RHS); 3496 3497 return false; 3498} 3499 3500bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3501 const ObjCInterfaceType *RHS) { 3502 // Verify that the base decls are compatible: the RHS must be a subclass of 3503 // the LHS. 3504 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3505 return false; 3506 3507 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3508 // protocol qualified at all, then we are good. 3509 if (LHS->getNumProtocols() == 0) 3510 return true; 3511 3512 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3513 // isn't a superset. 3514 if (RHS->getNumProtocols() == 0) 3515 return true; // FIXME: should return false! 3516 3517 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3518 LHSPE = LHS->qual_end(); 3519 LHSPI != LHSPE; LHSPI++) { 3520 bool RHSImplementsProtocol = false; 3521 3522 // If the RHS doesn't implement the protocol on the left, the types 3523 // are incompatible. 3524 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3525 RHSPE = RHS->qual_end(); 3526 RHSPI != RHSPE; RHSPI++) { 3527 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3528 RHSImplementsProtocol = true; 3529 break; 3530 } 3531 } 3532 // FIXME: For better diagnostics, consider passing back the protocol name. 3533 if (!RHSImplementsProtocol) 3534 return false; 3535 } 3536 // The RHS implements all protocols listed on the LHS. 3537 return true; 3538} 3539 3540bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3541 // get the "pointed to" types 3542 const ObjCObjectPointerType *LHSOPT = LHS->getAsObjCObjectPointerType(); 3543 const ObjCObjectPointerType *RHSOPT = RHS->getAsObjCObjectPointerType(); 3544 3545 if (!LHSOPT || !RHSOPT) 3546 return false; 3547 3548 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3549 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3550} 3551 3552/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3553/// both shall have the identically qualified version of a compatible type. 3554/// C99 6.2.7p1: Two types have compatible types if their types are the 3555/// same. See 6.7.[2,3,5] for additional rules. 3556bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3557 return !mergeTypes(LHS, RHS).isNull(); 3558} 3559 3560QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3561 const FunctionType *lbase = lhs->getAsFunctionType(); 3562 const FunctionType *rbase = rhs->getAsFunctionType(); 3563 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3564 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3565 bool allLTypes = true; 3566 bool allRTypes = true; 3567 3568 // Check return type 3569 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3570 if (retType.isNull()) return QualType(); 3571 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3572 allLTypes = false; 3573 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3574 allRTypes = false; 3575 // FIXME: double check this 3576 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 3577 if (NoReturn != lbase->getNoReturnAttr()) 3578 allLTypes = false; 3579 if (NoReturn != rbase->getNoReturnAttr()) 3580 allRTypes = false; 3581 3582 if (lproto && rproto) { // two C99 style function prototypes 3583 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3584 "C++ shouldn't be here"); 3585 unsigned lproto_nargs = lproto->getNumArgs(); 3586 unsigned rproto_nargs = rproto->getNumArgs(); 3587 3588 // Compatible functions must have the same number of arguments 3589 if (lproto_nargs != rproto_nargs) 3590 return QualType(); 3591 3592 // Variadic and non-variadic functions aren't compatible 3593 if (lproto->isVariadic() != rproto->isVariadic()) 3594 return QualType(); 3595 3596 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3597 return QualType(); 3598 3599 // Check argument compatibility 3600 llvm::SmallVector<QualType, 10> types; 3601 for (unsigned i = 0; i < lproto_nargs; i++) { 3602 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3603 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3604 QualType argtype = mergeTypes(largtype, rargtype); 3605 if (argtype.isNull()) return QualType(); 3606 types.push_back(argtype); 3607 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3608 allLTypes = false; 3609 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3610 allRTypes = false; 3611 } 3612 if (allLTypes) return lhs; 3613 if (allRTypes) return rhs; 3614 return getFunctionType(retType, types.begin(), types.size(), 3615 lproto->isVariadic(), lproto->getTypeQuals(), 3616 NoReturn); 3617 } 3618 3619 if (lproto) allRTypes = false; 3620 if (rproto) allLTypes = false; 3621 3622 const FunctionProtoType *proto = lproto ? lproto : rproto; 3623 if (proto) { 3624 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3625 if (proto->isVariadic()) return QualType(); 3626 // Check that the types are compatible with the types that 3627 // would result from default argument promotions (C99 6.7.5.3p15). 3628 // The only types actually affected are promotable integer 3629 // types and floats, which would be passed as a different 3630 // type depending on whether the prototype is visible. 3631 unsigned proto_nargs = proto->getNumArgs(); 3632 for (unsigned i = 0; i < proto_nargs; ++i) { 3633 QualType argTy = proto->getArgType(i); 3634 if (argTy->isPromotableIntegerType() || 3635 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3636 return QualType(); 3637 } 3638 3639 if (allLTypes) return lhs; 3640 if (allRTypes) return rhs; 3641 return getFunctionType(retType, proto->arg_type_begin(), 3642 proto->getNumArgs(), proto->isVariadic(), 3643 proto->getTypeQuals(), NoReturn); 3644 } 3645 3646 if (allLTypes) return lhs; 3647 if (allRTypes) return rhs; 3648 return getFunctionNoProtoType(retType, NoReturn); 3649} 3650 3651QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3652 // C++ [expr]: If an expression initially has the type "reference to T", the 3653 // type is adjusted to "T" prior to any further analysis, the expression 3654 // designates the object or function denoted by the reference, and the 3655 // expression is an lvalue unless the reference is an rvalue reference and 3656 // the expression is a function call (possibly inside parentheses). 3657 // FIXME: C++ shouldn't be going through here! The rules are different 3658 // enough that they should be handled separately. 3659 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3660 // shouldn't be going through here! 3661 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 3662 LHS = RT->getPointeeType(); 3663 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 3664 RHS = RT->getPointeeType(); 3665 3666 QualType LHSCan = getCanonicalType(LHS), 3667 RHSCan = getCanonicalType(RHS); 3668 3669 // If two types are identical, they are compatible. 3670 if (LHSCan == RHSCan) 3671 return LHS; 3672 3673 // If the qualifiers are different, the types aren't compatible 3674 // Note that we handle extended qualifiers later, in the 3675 // case for ExtQualType. 3676 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3677 return QualType(); 3678 3679 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3680 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3681 3682 // We want to consider the two function types to be the same for these 3683 // comparisons, just force one to the other. 3684 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3685 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3686 3687 // Strip off objc_gc attributes off the top level so they can be merged. 3688 // This is a complete mess, but the attribute itself doesn't make much sense. 3689 if (RHSClass == Type::ExtQual) { 3690 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3691 if (GCAttr != QualType::GCNone) { 3692 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3693 // __weak attribute must appear on both declarations. 3694 // __strong attribue is redundant if other decl is an objective-c 3695 // object pointer (or decorated with __strong attribute); otherwise 3696 // issue error. 3697 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3698 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3699 !LHSCan->isObjCObjectPointerType())) 3700 return QualType(); 3701 3702 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3703 RHS.getCVRQualifiers()); 3704 QualType Result = mergeTypes(LHS, RHS); 3705 if (!Result.isNull()) { 3706 if (Result.getObjCGCAttr() == QualType::GCNone) 3707 Result = getObjCGCQualType(Result, GCAttr); 3708 else if (Result.getObjCGCAttr() != GCAttr) 3709 Result = QualType(); 3710 } 3711 return Result; 3712 } 3713 } 3714 if (LHSClass == Type::ExtQual) { 3715 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3716 if (GCAttr != QualType::GCNone) { 3717 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3718 // __weak attribute must appear on both declarations. __strong 3719 // __strong attribue is redundant if other decl is an objective-c 3720 // object pointer (or decorated with __strong attribute); otherwise 3721 // issue error. 3722 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3723 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3724 !RHSCan->isObjCObjectPointerType())) 3725 return QualType(); 3726 3727 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3728 LHS.getCVRQualifiers()); 3729 QualType Result = mergeTypes(LHS, RHS); 3730 if (!Result.isNull()) { 3731 if (Result.getObjCGCAttr() == QualType::GCNone) 3732 Result = getObjCGCQualType(Result, GCAttr); 3733 else if (Result.getObjCGCAttr() != GCAttr) 3734 Result = QualType(); 3735 } 3736 return Result; 3737 } 3738 } 3739 3740 // Same as above for arrays 3741 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3742 LHSClass = Type::ConstantArray; 3743 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3744 RHSClass = Type::ConstantArray; 3745 3746 // Canonicalize ExtVector -> Vector. 3747 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3748 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3749 3750 // If the canonical type classes don't match. 3751 if (LHSClass != RHSClass) { 3752 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3753 // a signed integer type, or an unsigned integer type. 3754 if (const EnumType* ETy = LHS->getAsEnumType()) { 3755 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3756 return RHS; 3757 } 3758 if (const EnumType* ETy = RHS->getAsEnumType()) { 3759 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3760 return LHS; 3761 } 3762 3763 return QualType(); 3764 } 3765 3766 // The canonical type classes match. 3767 switch (LHSClass) { 3768#define TYPE(Class, Base) 3769#define ABSTRACT_TYPE(Class, Base) 3770#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3771#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3772#include "clang/AST/TypeNodes.def" 3773 assert(false && "Non-canonical and dependent types shouldn't get here"); 3774 return QualType(); 3775 3776 case Type::LValueReference: 3777 case Type::RValueReference: 3778 case Type::MemberPointer: 3779 assert(false && "C++ should never be in mergeTypes"); 3780 return QualType(); 3781 3782 case Type::IncompleteArray: 3783 case Type::VariableArray: 3784 case Type::FunctionProto: 3785 case Type::ExtVector: 3786 assert(false && "Types are eliminated above"); 3787 return QualType(); 3788 3789 case Type::Pointer: 3790 { 3791 // Merge two pointer types, while trying to preserve typedef info 3792 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 3793 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 3794 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3795 if (ResultType.isNull()) return QualType(); 3796 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3797 return LHS; 3798 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3799 return RHS; 3800 return getPointerType(ResultType); 3801 } 3802 case Type::BlockPointer: 3803 { 3804 // Merge two block pointer types, while trying to preserve typedef info 3805 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 3806 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 3807 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3808 if (ResultType.isNull()) return QualType(); 3809 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3810 return LHS; 3811 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3812 return RHS; 3813 return getBlockPointerType(ResultType); 3814 } 3815 case Type::ConstantArray: 3816 { 3817 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3818 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3819 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3820 return QualType(); 3821 3822 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3823 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3824 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3825 if (ResultType.isNull()) return QualType(); 3826 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3827 return LHS; 3828 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3829 return RHS; 3830 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3831 ArrayType::ArraySizeModifier(), 0); 3832 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3833 ArrayType::ArraySizeModifier(), 0); 3834 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3835 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3836 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3837 return LHS; 3838 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3839 return RHS; 3840 if (LVAT) { 3841 // FIXME: This isn't correct! But tricky to implement because 3842 // the array's size has to be the size of LHS, but the type 3843 // has to be different. 3844 return LHS; 3845 } 3846 if (RVAT) { 3847 // FIXME: This isn't correct! But tricky to implement because 3848 // the array's size has to be the size of RHS, but the type 3849 // has to be different. 3850 return RHS; 3851 } 3852 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3853 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3854 return getIncompleteArrayType(ResultType, 3855 ArrayType::ArraySizeModifier(), 0); 3856 } 3857 case Type::FunctionNoProto: 3858 return mergeFunctionTypes(LHS, RHS); 3859 case Type::Record: 3860 case Type::Enum: 3861 return QualType(); 3862 case Type::Builtin: 3863 // Only exactly equal builtin types are compatible, which is tested above. 3864 return QualType(); 3865 case Type::Complex: 3866 // Distinct complex types are incompatible. 3867 return QualType(); 3868 case Type::Vector: 3869 // FIXME: The merged type should be an ExtVector! 3870 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3871 return LHS; 3872 return QualType(); 3873 case Type::ObjCInterface: { 3874 // Check if the interfaces are assignment compatible. 3875 // FIXME: This should be type compatibility, e.g. whether 3876 // "LHS x; RHS x;" at global scope is legal. 3877 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3878 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3879 if (LHSIface && RHSIface && 3880 canAssignObjCInterfaces(LHSIface, RHSIface)) 3881 return LHS; 3882 3883 return QualType(); 3884 } 3885 case Type::ObjCObjectPointer: { 3886 if (canAssignObjCInterfaces(LHS->getAsObjCObjectPointerType(), 3887 RHS->getAsObjCObjectPointerType())) 3888 return LHS; 3889 3890 return QualType(); 3891 } 3892 case Type::FixedWidthInt: 3893 // Distinct fixed-width integers are not compatible. 3894 return QualType(); 3895 case Type::ExtQual: 3896 // FIXME: ExtQual types can be compatible even if they're not 3897 // identical! 3898 return QualType(); 3899 // First attempt at an implementation, but I'm not really sure it's 3900 // right... 3901#if 0 3902 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3903 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3904 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3905 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3906 return QualType(); 3907 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3908 LHSBase = QualType(LQual->getBaseType(), 0); 3909 RHSBase = QualType(RQual->getBaseType(), 0); 3910 ResultType = mergeTypes(LHSBase, RHSBase); 3911 if (ResultType.isNull()) return QualType(); 3912 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3913 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3914 return LHS; 3915 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3916 return RHS; 3917 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3918 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3919 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3920 return ResultType; 3921#endif 3922 3923 case Type::TemplateSpecialization: 3924 assert(false && "Dependent types have no size"); 3925 break; 3926 } 3927 3928 return QualType(); 3929} 3930 3931//===----------------------------------------------------------------------===// 3932// Integer Predicates 3933//===----------------------------------------------------------------------===// 3934 3935unsigned ASTContext::getIntWidth(QualType T) { 3936 if (T == BoolTy) 3937 return 1; 3938 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 3939 return FWIT->getWidth(); 3940 } 3941 // For builtin types, just use the standard type sizing method 3942 return (unsigned)getTypeSize(T); 3943} 3944 3945QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 3946 assert(T->isSignedIntegerType() && "Unexpected type"); 3947 if (const EnumType* ETy = T->getAsEnumType()) 3948 T = ETy->getDecl()->getIntegerType(); 3949 const BuiltinType* BTy = T->getAsBuiltinType(); 3950 assert (BTy && "Unexpected signed integer type"); 3951 switch (BTy->getKind()) { 3952 case BuiltinType::Char_S: 3953 case BuiltinType::SChar: 3954 return UnsignedCharTy; 3955 case BuiltinType::Short: 3956 return UnsignedShortTy; 3957 case BuiltinType::Int: 3958 return UnsignedIntTy; 3959 case BuiltinType::Long: 3960 return UnsignedLongTy; 3961 case BuiltinType::LongLong: 3962 return UnsignedLongLongTy; 3963 case BuiltinType::Int128: 3964 return UnsignedInt128Ty; 3965 default: 3966 assert(0 && "Unexpected signed integer type"); 3967 return QualType(); 3968 } 3969} 3970 3971ExternalASTSource::~ExternalASTSource() { } 3972 3973void ExternalASTSource::PrintStats() { } 3974 3975 3976//===----------------------------------------------------------------------===// 3977// Builtin Type Computation 3978//===----------------------------------------------------------------------===// 3979 3980/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 3981/// pointer over the consumed characters. This returns the resultant type. 3982static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 3983 ASTContext::GetBuiltinTypeError &Error, 3984 bool AllowTypeModifiers = true) { 3985 // Modifiers. 3986 int HowLong = 0; 3987 bool Signed = false, Unsigned = false; 3988 3989 // Read the modifiers first. 3990 bool Done = false; 3991 while (!Done) { 3992 switch (*Str++) { 3993 default: Done = true; --Str; break; 3994 case 'S': 3995 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 3996 assert(!Signed && "Can't use 'S' modifier multiple times!"); 3997 Signed = true; 3998 break; 3999 case 'U': 4000 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4001 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4002 Unsigned = true; 4003 break; 4004 case 'L': 4005 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4006 ++HowLong; 4007 break; 4008 } 4009 } 4010 4011 QualType Type; 4012 4013 // Read the base type. 4014 switch (*Str++) { 4015 default: assert(0 && "Unknown builtin type letter!"); 4016 case 'v': 4017 assert(HowLong == 0 && !Signed && !Unsigned && 4018 "Bad modifiers used with 'v'!"); 4019 Type = Context.VoidTy; 4020 break; 4021 case 'f': 4022 assert(HowLong == 0 && !Signed && !Unsigned && 4023 "Bad modifiers used with 'f'!"); 4024 Type = Context.FloatTy; 4025 break; 4026 case 'd': 4027 assert(HowLong < 2 && !Signed && !Unsigned && 4028 "Bad modifiers used with 'd'!"); 4029 if (HowLong) 4030 Type = Context.LongDoubleTy; 4031 else 4032 Type = Context.DoubleTy; 4033 break; 4034 case 's': 4035 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4036 if (Unsigned) 4037 Type = Context.UnsignedShortTy; 4038 else 4039 Type = Context.ShortTy; 4040 break; 4041 case 'i': 4042 if (HowLong == 3) 4043 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4044 else if (HowLong == 2) 4045 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4046 else if (HowLong == 1) 4047 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4048 else 4049 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4050 break; 4051 case 'c': 4052 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4053 if (Signed) 4054 Type = Context.SignedCharTy; 4055 else if (Unsigned) 4056 Type = Context.UnsignedCharTy; 4057 else 4058 Type = Context.CharTy; 4059 break; 4060 case 'b': // boolean 4061 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4062 Type = Context.BoolTy; 4063 break; 4064 case 'z': // size_t. 4065 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4066 Type = Context.getSizeType(); 4067 break; 4068 case 'F': 4069 Type = Context.getCFConstantStringType(); 4070 break; 4071 case 'a': 4072 Type = Context.getBuiltinVaListType(); 4073 assert(!Type.isNull() && "builtin va list type not initialized!"); 4074 break; 4075 case 'A': 4076 // This is a "reference" to a va_list; however, what exactly 4077 // this means depends on how va_list is defined. There are two 4078 // different kinds of va_list: ones passed by value, and ones 4079 // passed by reference. An example of a by-value va_list is 4080 // x86, where va_list is a char*. An example of by-ref va_list 4081 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4082 // we want this argument to be a char*&; for x86-64, we want 4083 // it to be a __va_list_tag*. 4084 Type = Context.getBuiltinVaListType(); 4085 assert(!Type.isNull() && "builtin va list type not initialized!"); 4086 if (Type->isArrayType()) { 4087 Type = Context.getArrayDecayedType(Type); 4088 } else { 4089 Type = Context.getLValueReferenceType(Type); 4090 } 4091 break; 4092 case 'V': { 4093 char *End; 4094 unsigned NumElements = strtoul(Str, &End, 10); 4095 assert(End != Str && "Missing vector size"); 4096 4097 Str = End; 4098 4099 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4100 Type = Context.getVectorType(ElementType, NumElements); 4101 break; 4102 } 4103 case 'P': 4104 Type = Context.getFILEType(); 4105 if (Type.isNull()) { 4106 Error = ASTContext::GE_Missing_stdio; 4107 return QualType(); 4108 } 4109 break; 4110 case 'J': 4111 if (Signed) 4112 Type = Context.getsigjmp_bufType(); 4113 else 4114 Type = Context.getjmp_bufType(); 4115 4116 if (Type.isNull()) { 4117 Error = ASTContext::GE_Missing_setjmp; 4118 return QualType(); 4119 } 4120 break; 4121 } 4122 4123 if (!AllowTypeModifiers) 4124 return Type; 4125 4126 Done = false; 4127 while (!Done) { 4128 switch (*Str++) { 4129 default: Done = true; --Str; break; 4130 case '*': 4131 Type = Context.getPointerType(Type); 4132 break; 4133 case '&': 4134 Type = Context.getLValueReferenceType(Type); 4135 break; 4136 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4137 case 'C': 4138 Type = Type.getQualifiedType(QualType::Const); 4139 break; 4140 } 4141 } 4142 4143 return Type; 4144} 4145 4146/// GetBuiltinType - Return the type for the specified builtin. 4147QualType ASTContext::GetBuiltinType(unsigned id, 4148 GetBuiltinTypeError &Error) { 4149 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4150 4151 llvm::SmallVector<QualType, 8> ArgTypes; 4152 4153 Error = GE_None; 4154 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4155 if (Error != GE_None) 4156 return QualType(); 4157 while (TypeStr[0] && TypeStr[0] != '.') { 4158 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4159 if (Error != GE_None) 4160 return QualType(); 4161 4162 // Do array -> pointer decay. The builtin should use the decayed type. 4163 if (Ty->isArrayType()) 4164 Ty = getArrayDecayedType(Ty); 4165 4166 ArgTypes.push_back(Ty); 4167 } 4168 4169 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4170 "'.' should only occur at end of builtin type list!"); 4171 4172 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4173 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4174 return getFunctionNoProtoType(ResType); 4175 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4176 TypeStr[0] == '.', 0); 4177} 4178