ASTContext.cpp revision d8b285fee4471f393da8ee30f552ceacdc362afa
1//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclCXX.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/TypeLoc.h" 19#include "clang/AST/Expr.h" 20#include "clang/AST/ExternalASTSource.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/Basic/Builtins.h" 23#include "clang/Basic/SourceManager.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/ADT/StringExtras.h" 26#include "llvm/Support/MathExtras.h" 27#include "llvm/Support/MemoryBuffer.h" 28#include "RecordLayoutBuilder.h" 29 30using namespace clang; 31 32enum FloatingRank { 33 FloatRank, DoubleRank, LongDoubleRank 34}; 35 36ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 37 TargetInfo &t, 38 IdentifierTable &idents, SelectorTable &sels, 39 Builtin::Context &builtins, 40 bool FreeMem, unsigned size_reserve) : 41 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 42 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 43 sigjmp_bufDecl(0), SourceMgr(SM), LangOpts(LOpts), 44 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 45 Idents(idents), Selectors(sels), 46 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 47 ObjCIdRedefinitionType = QualType(); 48 ObjCClassRedefinitionType = QualType(); 49 if (size_reserve > 0) Types.reserve(size_reserve); 50 TUDecl = TranslationUnitDecl::Create(*this); 51 InitBuiltinTypes(); 52} 53 54ASTContext::~ASTContext() { 55 // Deallocate all the types. 56 while (!Types.empty()) { 57 Types.back()->Destroy(*this); 58 Types.pop_back(); 59 } 60 61 { 62 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 63 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 64 while (I != E) { 65 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 66 delete R; 67 } 68 } 69 70 { 71 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 72 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 73 while (I != E) { 74 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 75 delete R; 76 } 77 } 78 79 // Destroy nested-name-specifiers. 80 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 81 NNS = NestedNameSpecifiers.begin(), 82 NNSEnd = NestedNameSpecifiers.end(); 83 NNS != NNSEnd; 84 /* Increment in loop */) 85 (*NNS++).Destroy(*this); 86 87 if (GlobalNestedNameSpecifier) 88 GlobalNestedNameSpecifier->Destroy(*this); 89 90 TUDecl->Destroy(*this); 91} 92 93void 94ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 95 ExternalSource.reset(Source.take()); 96} 97 98void ASTContext::PrintStats() const { 99 fprintf(stderr, "*** AST Context Stats:\n"); 100 fprintf(stderr, " %d types total.\n", (int)Types.size()); 101 102 unsigned counts[] = { 103#define TYPE(Name, Parent) 0, 104#define ABSTRACT_TYPE(Name, Parent) 105#include "clang/AST/TypeNodes.def" 106 0 // Extra 107 }; 108 109 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 110 Type *T = Types[i]; 111 counts[(unsigned)T->getTypeClass()]++; 112 } 113 114 unsigned Idx = 0; 115 unsigned TotalBytes = 0; 116#define TYPE(Name, Parent) \ 117 if (counts[Idx]) \ 118 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 119 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 120 ++Idx; 121#define ABSTRACT_TYPE(Name, Parent) 122#include "clang/AST/TypeNodes.def" 123 124 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 125 126 if (ExternalSource.get()) { 127 fprintf(stderr, "\n"); 128 ExternalSource->PrintStats(); 129 } 130} 131 132 133void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 134 Types.push_back((R = QualType(new (*this,8) BuiltinType(K),0)).getTypePtr()); 135} 136 137void ASTContext::InitBuiltinTypes() { 138 assert(VoidTy.isNull() && "Context reinitialized?"); 139 140 // C99 6.2.5p19. 141 InitBuiltinType(VoidTy, BuiltinType::Void); 142 143 // C99 6.2.5p2. 144 InitBuiltinType(BoolTy, BuiltinType::Bool); 145 // C99 6.2.5p3. 146 if (LangOpts.CharIsSigned) 147 InitBuiltinType(CharTy, BuiltinType::Char_S); 148 else 149 InitBuiltinType(CharTy, BuiltinType::Char_U); 150 // C99 6.2.5p4. 151 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 152 InitBuiltinType(ShortTy, BuiltinType::Short); 153 InitBuiltinType(IntTy, BuiltinType::Int); 154 InitBuiltinType(LongTy, BuiltinType::Long); 155 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 156 157 // C99 6.2.5p6. 158 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 159 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 160 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 161 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 162 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 163 164 // C99 6.2.5p10. 165 InitBuiltinType(FloatTy, BuiltinType::Float); 166 InitBuiltinType(DoubleTy, BuiltinType::Double); 167 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 168 169 // GNU extension, 128-bit integers. 170 InitBuiltinType(Int128Ty, BuiltinType::Int128); 171 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 172 173 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 174 InitBuiltinType(WCharTy, BuiltinType::WChar); 175 else // C99 176 WCharTy = getFromTargetType(Target.getWCharType()); 177 178 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 179 InitBuiltinType(Char16Ty, BuiltinType::Char16); 180 else // C99 181 Char16Ty = getFromTargetType(Target.getChar16Type()); 182 183 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 184 InitBuiltinType(Char32Ty, BuiltinType::Char32); 185 else // C99 186 Char32Ty = getFromTargetType(Target.getChar32Type()); 187 188 // Placeholder type for functions. 189 InitBuiltinType(OverloadTy, BuiltinType::Overload); 190 191 // Placeholder type for type-dependent expressions whose type is 192 // completely unknown. No code should ever check a type against 193 // DependentTy and users should never see it; however, it is here to 194 // help diagnose failures to properly check for type-dependent 195 // expressions. 196 InitBuiltinType(DependentTy, BuiltinType::Dependent); 197 198 // Placeholder type for C++0x auto declarations whose real type has 199 // not yet been deduced. 200 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 201 202 // C99 6.2.5p11. 203 FloatComplexTy = getComplexType(FloatTy); 204 DoubleComplexTy = getComplexType(DoubleTy); 205 LongDoubleComplexTy = getComplexType(LongDoubleTy); 206 207 BuiltinVaListType = QualType(); 208 209 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 210 ObjCIdTypedefType = QualType(); 211 ObjCClassTypedefType = QualType(); 212 213 // Builtin types for 'id' and 'Class'. 214 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 215 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 216 217 ObjCConstantStringType = QualType(); 218 219 // void * type 220 VoidPtrTy = getPointerType(VoidTy); 221 222 // nullptr type (C++0x 2.14.7) 223 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 224} 225 226VarDecl *ASTContext::getInstantiatedFromStaticDataMember(VarDecl *Var) { 227 assert(Var->isStaticDataMember() && "Not a static data member"); 228 llvm::DenseMap<VarDecl *, VarDecl *>::iterator Pos 229 = InstantiatedFromStaticDataMember.find(Var); 230 if (Pos == InstantiatedFromStaticDataMember.end()) 231 return 0; 232 233 return Pos->second; 234} 235 236void 237ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl) { 238 assert(Inst->isStaticDataMember() && "Not a static data member"); 239 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 240 assert(!InstantiatedFromStaticDataMember[Inst] && 241 "Already noted what static data member was instantiated from"); 242 InstantiatedFromStaticDataMember[Inst] = Tmpl; 243} 244 245UnresolvedUsingDecl * 246ASTContext::getInstantiatedFromUnresolvedUsingDecl(UsingDecl *UUD) { 247 llvm::DenseMap<UsingDecl *, UnresolvedUsingDecl *>::iterator Pos 248 = InstantiatedFromUnresolvedUsingDecl.find(UUD); 249 if (Pos == InstantiatedFromUnresolvedUsingDecl.end()) 250 return 0; 251 252 return Pos->second; 253} 254 255void 256ASTContext::setInstantiatedFromUnresolvedUsingDecl(UsingDecl *UD, 257 UnresolvedUsingDecl *UUD) { 258 assert(!InstantiatedFromUnresolvedUsingDecl[UD] && 259 "Already noted what using decl what instantiated from"); 260 InstantiatedFromUnresolvedUsingDecl[UD] = UUD; 261} 262 263FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 264 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 265 = InstantiatedFromUnnamedFieldDecl.find(Field); 266 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 267 return 0; 268 269 return Pos->second; 270} 271 272void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 273 FieldDecl *Tmpl) { 274 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 275 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 276 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 277 "Already noted what unnamed field was instantiated from"); 278 279 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 280} 281 282namespace { 283 class BeforeInTranslationUnit 284 : std::binary_function<SourceRange, SourceRange, bool> { 285 SourceManager *SourceMgr; 286 287 public: 288 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 289 290 bool operator()(SourceRange X, SourceRange Y) { 291 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 292 } 293 }; 294} 295 296/// \brief Determine whether the given comment is a Doxygen-style comment. 297/// 298/// \param Start the start of the comment text. 299/// 300/// \param End the end of the comment text. 301/// 302/// \param Member whether we want to check whether this is a member comment 303/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 304/// we only return true when we find a non-member comment. 305static bool 306isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 307 bool Member = false) { 308 const char *BufferStart 309 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 310 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 311 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 312 313 if (End - Start < 4) 314 return false; 315 316 assert(Start[0] == '/' && "Not a comment?"); 317 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 318 return false; 319 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 320 return false; 321 322 return (Start[3] == '<') == Member; 323} 324 325/// \brief Retrieve the comment associated with the given declaration, if 326/// it has one. 327const char *ASTContext::getCommentForDecl(const Decl *D) { 328 if (!D) 329 return 0; 330 331 // Check whether we have cached a comment string for this declaration 332 // already. 333 llvm::DenseMap<const Decl *, std::string>::iterator Pos 334 = DeclComments.find(D); 335 if (Pos != DeclComments.end()) 336 return Pos->second.c_str(); 337 338 // If we have an external AST source and have not yet loaded comments from 339 // that source, do so now. 340 if (ExternalSource && !LoadedExternalComments) { 341 std::vector<SourceRange> LoadedComments; 342 ExternalSource->ReadComments(LoadedComments); 343 344 if (!LoadedComments.empty()) 345 Comments.insert(Comments.begin(), LoadedComments.begin(), 346 LoadedComments.end()); 347 348 LoadedExternalComments = true; 349 } 350 351 // If there are no comments anywhere, we won't find anything. 352 if (Comments.empty()) 353 return 0; 354 355 // If the declaration doesn't map directly to a location in a file, we 356 // can't find the comment. 357 SourceLocation DeclStartLoc = D->getLocStart(); 358 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 359 return 0; 360 361 // Find the comment that occurs just before this declaration. 362 std::vector<SourceRange>::iterator LastComment 363 = std::lower_bound(Comments.begin(), Comments.end(), 364 SourceRange(DeclStartLoc), 365 BeforeInTranslationUnit(&SourceMgr)); 366 367 // Decompose the location for the start of the declaration and find the 368 // beginning of the file buffer. 369 std::pair<FileID, unsigned> DeclStartDecomp 370 = SourceMgr.getDecomposedLoc(DeclStartLoc); 371 const char *FileBufferStart 372 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 373 374 // First check whether we have a comment for a member. 375 if (LastComment != Comments.end() && 376 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 377 isDoxygenComment(SourceMgr, *LastComment, true)) { 378 std::pair<FileID, unsigned> LastCommentEndDecomp 379 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 380 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 381 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 382 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 383 LastCommentEndDecomp.second)) { 384 // The Doxygen member comment comes after the declaration starts and 385 // is on the same line and in the same file as the declaration. This 386 // is the comment we want. 387 std::string &Result = DeclComments[D]; 388 Result.append(FileBufferStart + 389 SourceMgr.getFileOffset(LastComment->getBegin()), 390 FileBufferStart + LastCommentEndDecomp.second + 1); 391 return Result.c_str(); 392 } 393 } 394 395 if (LastComment == Comments.begin()) 396 return 0; 397 --LastComment; 398 399 // Decompose the end of the comment. 400 std::pair<FileID, unsigned> LastCommentEndDecomp 401 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 402 403 // If the comment and the declaration aren't in the same file, then they 404 // aren't related. 405 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 406 return 0; 407 408 // Check that we actually have a Doxygen comment. 409 if (!isDoxygenComment(SourceMgr, *LastComment)) 410 return 0; 411 412 // Compute the starting line for the declaration and for the end of the 413 // comment (this is expensive). 414 unsigned DeclStartLine 415 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 416 unsigned CommentEndLine 417 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 418 LastCommentEndDecomp.second); 419 420 // If the comment does not end on the line prior to the declaration, then 421 // the comment is not associated with the declaration at all. 422 if (CommentEndLine + 1 != DeclStartLine) 423 return 0; 424 425 // We have a comment, but there may be more comments on the previous lines. 426 // Keep looking so long as the comments are still Doxygen comments and are 427 // still adjacent. 428 unsigned ExpectedLine 429 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 430 std::vector<SourceRange>::iterator FirstComment = LastComment; 431 while (FirstComment != Comments.begin()) { 432 // Look at the previous comment 433 --FirstComment; 434 std::pair<FileID, unsigned> Decomp 435 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 436 437 // If this previous comment is in a different file, we're done. 438 if (Decomp.first != DeclStartDecomp.first) { 439 ++FirstComment; 440 break; 441 } 442 443 // If this comment is not a Doxygen comment, we're done. 444 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 445 ++FirstComment; 446 break; 447 } 448 449 // If the line number is not what we expected, we're done. 450 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 451 if (Line != ExpectedLine) { 452 ++FirstComment; 453 break; 454 } 455 456 // Set the next expected line number. 457 ExpectedLine 458 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 459 } 460 461 // The iterator range [FirstComment, LastComment] contains all of the 462 // BCPL comments that, together, are associated with this declaration. 463 // Form a single comment block string for this declaration that concatenates 464 // all of these comments. 465 std::string &Result = DeclComments[D]; 466 while (FirstComment != LastComment) { 467 std::pair<FileID, unsigned> DecompStart 468 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 469 std::pair<FileID, unsigned> DecompEnd 470 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 471 Result.append(FileBufferStart + DecompStart.second, 472 FileBufferStart + DecompEnd.second + 1); 473 ++FirstComment; 474 } 475 476 // Append the last comment line. 477 Result.append(FileBufferStart + 478 SourceMgr.getFileOffset(LastComment->getBegin()), 479 FileBufferStart + LastCommentEndDecomp.second + 1); 480 return Result.c_str(); 481} 482 483//===----------------------------------------------------------------------===// 484// Type Sizing and Analysis 485//===----------------------------------------------------------------------===// 486 487/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 488/// scalar floating point type. 489const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 490 const BuiltinType *BT = T->getAsBuiltinType(); 491 assert(BT && "Not a floating point type!"); 492 switch (BT->getKind()) { 493 default: assert(0 && "Not a floating point type!"); 494 case BuiltinType::Float: return Target.getFloatFormat(); 495 case BuiltinType::Double: return Target.getDoubleFormat(); 496 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 497 } 498} 499 500/// getDeclAlign - Return a conservative estimate of the alignment of the 501/// specified decl. Note that bitfields do not have a valid alignment, so 502/// this method will assert on them. 503unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 504 unsigned Align = Target.getCharWidth(); 505 506 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 507 Align = std::max(Align, AA->getAlignment()); 508 509 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 510 QualType T = VD->getType(); 511 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 512 unsigned AS = RT->getPointeeType().getAddressSpace(); 513 Align = Target.getPointerAlign(AS); 514 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 515 // Incomplete or function types default to 1. 516 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 517 T = cast<ArrayType>(T)->getElementType(); 518 519 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 520 } 521 } 522 523 return Align / Target.getCharWidth(); 524} 525 526/// getTypeSize - Return the size of the specified type, in bits. This method 527/// does not work on incomplete types. 528std::pair<uint64_t, unsigned> 529ASTContext::getTypeInfo(const Type *T) { 530 uint64_t Width=0; 531 unsigned Align=8; 532 switch (T->getTypeClass()) { 533#define TYPE(Class, Base) 534#define ABSTRACT_TYPE(Class, Base) 535#define NON_CANONICAL_TYPE(Class, Base) 536#define DEPENDENT_TYPE(Class, Base) case Type::Class: 537#include "clang/AST/TypeNodes.def" 538 assert(false && "Should not see dependent types"); 539 break; 540 541 case Type::FunctionNoProto: 542 case Type::FunctionProto: 543 // GCC extension: alignof(function) = 32 bits 544 Width = 0; 545 Align = 32; 546 break; 547 548 case Type::IncompleteArray: 549 case Type::VariableArray: 550 Width = 0; 551 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 552 break; 553 554 case Type::ConstantArrayWithExpr: 555 case Type::ConstantArrayWithoutExpr: 556 case Type::ConstantArray: { 557 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 558 559 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 560 Width = EltInfo.first*CAT->getSize().getZExtValue(); 561 Align = EltInfo.second; 562 break; 563 } 564 case Type::ExtVector: 565 case Type::Vector: { 566 std::pair<uint64_t, unsigned> EltInfo = 567 getTypeInfo(cast<VectorType>(T)->getElementType()); 568 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 569 Align = Width; 570 // If the alignment is not a power of 2, round up to the next power of 2. 571 // This happens for non-power-of-2 length vectors. 572 // FIXME: this should probably be a target property. 573 Align = 1 << llvm::Log2_32_Ceil(Align); 574 break; 575 } 576 577 case Type::Builtin: 578 switch (cast<BuiltinType>(T)->getKind()) { 579 default: assert(0 && "Unknown builtin type!"); 580 case BuiltinType::Void: 581 // GCC extension: alignof(void) = 8 bits. 582 Width = 0; 583 Align = 8; 584 break; 585 586 case BuiltinType::Bool: 587 Width = Target.getBoolWidth(); 588 Align = Target.getBoolAlign(); 589 break; 590 case BuiltinType::Char_S: 591 case BuiltinType::Char_U: 592 case BuiltinType::UChar: 593 case BuiltinType::SChar: 594 Width = Target.getCharWidth(); 595 Align = Target.getCharAlign(); 596 break; 597 case BuiltinType::WChar: 598 Width = Target.getWCharWidth(); 599 Align = Target.getWCharAlign(); 600 break; 601 case BuiltinType::Char16: 602 Width = Target.getChar16Width(); 603 Align = Target.getChar16Align(); 604 break; 605 case BuiltinType::Char32: 606 Width = Target.getChar32Width(); 607 Align = Target.getChar32Align(); 608 break; 609 case BuiltinType::UShort: 610 case BuiltinType::Short: 611 Width = Target.getShortWidth(); 612 Align = Target.getShortAlign(); 613 break; 614 case BuiltinType::UInt: 615 case BuiltinType::Int: 616 Width = Target.getIntWidth(); 617 Align = Target.getIntAlign(); 618 break; 619 case BuiltinType::ULong: 620 case BuiltinType::Long: 621 Width = Target.getLongWidth(); 622 Align = Target.getLongAlign(); 623 break; 624 case BuiltinType::ULongLong: 625 case BuiltinType::LongLong: 626 Width = Target.getLongLongWidth(); 627 Align = Target.getLongLongAlign(); 628 break; 629 case BuiltinType::Int128: 630 case BuiltinType::UInt128: 631 Width = 128; 632 Align = 128; // int128_t is 128-bit aligned on all targets. 633 break; 634 case BuiltinType::Float: 635 Width = Target.getFloatWidth(); 636 Align = Target.getFloatAlign(); 637 break; 638 case BuiltinType::Double: 639 Width = Target.getDoubleWidth(); 640 Align = Target.getDoubleAlign(); 641 break; 642 case BuiltinType::LongDouble: 643 Width = Target.getLongDoubleWidth(); 644 Align = Target.getLongDoubleAlign(); 645 break; 646 case BuiltinType::NullPtr: 647 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 648 Align = Target.getPointerAlign(0); // == sizeof(void*) 649 break; 650 } 651 break; 652 case Type::FixedWidthInt: 653 // FIXME: This isn't precisely correct; the width/alignment should depend 654 // on the available types for the target 655 Width = cast<FixedWidthIntType>(T)->getWidth(); 656 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 657 Align = Width; 658 break; 659 case Type::ExtQual: 660 // FIXME: Pointers into different addr spaces could have different sizes and 661 // alignment requirements: getPointerInfo should take an AddrSpace. 662 return getTypeInfo(QualType(cast<ExtQualType>(T)->getBaseType(), 0)); 663 case Type::ObjCObjectPointer: 664 Width = Target.getPointerWidth(0); 665 Align = Target.getPointerAlign(0); 666 break; 667 case Type::BlockPointer: { 668 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 669 Width = Target.getPointerWidth(AS); 670 Align = Target.getPointerAlign(AS); 671 break; 672 } 673 case Type::Pointer: { 674 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 675 Width = Target.getPointerWidth(AS); 676 Align = Target.getPointerAlign(AS); 677 break; 678 } 679 case Type::LValueReference: 680 case Type::RValueReference: 681 // "When applied to a reference or a reference type, the result is the size 682 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 683 // FIXME: This is wrong for struct layout: a reference in a struct has 684 // pointer size. 685 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 686 case Type::MemberPointer: { 687 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 688 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 689 // If we ever want to support other ABIs this needs to be abstracted. 690 691 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 692 std::pair<uint64_t, unsigned> PtrDiffInfo = 693 getTypeInfo(getPointerDiffType()); 694 Width = PtrDiffInfo.first; 695 if (Pointee->isFunctionType()) 696 Width *= 2; 697 Align = PtrDiffInfo.second; 698 break; 699 } 700 case Type::Complex: { 701 // Complex types have the same alignment as their elements, but twice the 702 // size. 703 std::pair<uint64_t, unsigned> EltInfo = 704 getTypeInfo(cast<ComplexType>(T)->getElementType()); 705 Width = EltInfo.first*2; 706 Align = EltInfo.second; 707 break; 708 } 709 case Type::ObjCInterface: { 710 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 711 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 712 Width = Layout.getSize(); 713 Align = Layout.getAlignment(); 714 break; 715 } 716 case Type::Record: 717 case Type::Enum: { 718 const TagType *TT = cast<TagType>(T); 719 720 if (TT->getDecl()->isInvalidDecl()) { 721 Width = 1; 722 Align = 1; 723 break; 724 } 725 726 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 727 return getTypeInfo(ET->getDecl()->getIntegerType()); 728 729 const RecordType *RT = cast<RecordType>(TT); 730 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 731 Width = Layout.getSize(); 732 Align = Layout.getAlignment(); 733 break; 734 } 735 736 case Type::Typedef: { 737 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 738 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 739 Align = Aligned->getAlignment(); 740 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 741 } else 742 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 743 break; 744 } 745 746 case Type::TypeOfExpr: 747 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 748 .getTypePtr()); 749 750 case Type::TypeOf: 751 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 752 753 case Type::Decltype: 754 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 755 .getTypePtr()); 756 757 case Type::QualifiedName: 758 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 759 760 case Type::TemplateSpecialization: 761 assert(getCanonicalType(T) != T && 762 "Cannot request the size of a dependent type"); 763 // FIXME: this is likely to be wrong once we support template 764 // aliases, since a template alias could refer to a typedef that 765 // has an __aligned__ attribute on it. 766 return getTypeInfo(getCanonicalType(T)); 767 } 768 769 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 770 return std::make_pair(Width, Align); 771} 772 773/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 774/// type for the current target in bits. This can be different than the ABI 775/// alignment in cases where it is beneficial for performance to overalign 776/// a data type. 777unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 778 unsigned ABIAlign = getTypeAlign(T); 779 780 // Double and long long should be naturally aligned if possible. 781 if (const ComplexType* CT = T->getAsComplexType()) 782 T = CT->getElementType().getTypePtr(); 783 if (T->isSpecificBuiltinType(BuiltinType::Double) || 784 T->isSpecificBuiltinType(BuiltinType::LongLong)) 785 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 786 787 return ABIAlign; 788} 789 790static void CollectLocalObjCIvars(ASTContext *Ctx, 791 const ObjCInterfaceDecl *OI, 792 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 793 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 794 E = OI->ivar_end(); I != E; ++I) { 795 ObjCIvarDecl *IVDecl = *I; 796 if (!IVDecl->isInvalidDecl()) 797 Fields.push_back(cast<FieldDecl>(IVDecl)); 798 } 799} 800 801void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 802 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 803 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 804 CollectObjCIvars(SuperClass, Fields); 805 CollectLocalObjCIvars(this, OI, Fields); 806} 807 808/// ShallowCollectObjCIvars - 809/// Collect all ivars, including those synthesized, in the current class. 810/// 811void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 812 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 813 bool CollectSynthesized) { 814 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 815 E = OI->ivar_end(); I != E; ++I) { 816 Ivars.push_back(*I); 817 } 818 if (CollectSynthesized) 819 CollectSynthesizedIvars(OI, Ivars); 820} 821 822void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 823 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 824 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 825 E = PD->prop_end(); I != E; ++I) 826 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 827 Ivars.push_back(Ivar); 828 829 // Also look into nested protocols. 830 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 831 E = PD->protocol_end(); P != E; ++P) 832 CollectProtocolSynthesizedIvars(*P, Ivars); 833} 834 835/// CollectSynthesizedIvars - 836/// This routine collect synthesized ivars for the designated class. 837/// 838void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 839 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 840 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 841 E = OI->prop_end(); I != E; ++I) { 842 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 843 Ivars.push_back(Ivar); 844 } 845 // Also look into interface's protocol list for properties declared 846 // in the protocol and whose ivars are synthesized. 847 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 848 PE = OI->protocol_end(); P != PE; ++P) { 849 ObjCProtocolDecl *PD = (*P); 850 CollectProtocolSynthesizedIvars(PD, Ivars); 851 } 852} 853 854unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 855 unsigned count = 0; 856 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 857 E = PD->prop_end(); I != E; ++I) 858 if ((*I)->getPropertyIvarDecl()) 859 ++count; 860 861 // Also look into nested protocols. 862 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 863 E = PD->protocol_end(); P != E; ++P) 864 count += CountProtocolSynthesizedIvars(*P); 865 return count; 866} 867 868unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) 869{ 870 unsigned count = 0; 871 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 872 E = OI->prop_end(); I != E; ++I) { 873 if ((*I)->getPropertyIvarDecl()) 874 ++count; 875 } 876 // Also look into interface's protocol list for properties declared 877 // in the protocol and whose ivars are synthesized. 878 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 879 PE = OI->protocol_end(); P != PE; ++P) { 880 ObjCProtocolDecl *PD = (*P); 881 count += CountProtocolSynthesizedIvars(PD); 882 } 883 return count; 884} 885 886/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 887ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 888 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 889 I = ObjCImpls.find(D); 890 if (I != ObjCImpls.end()) 891 return cast<ObjCImplementationDecl>(I->second); 892 return 0; 893} 894/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 895ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 896 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 897 I = ObjCImpls.find(D); 898 if (I != ObjCImpls.end()) 899 return cast<ObjCCategoryImplDecl>(I->second); 900 return 0; 901} 902 903/// \brief Set the implementation of ObjCInterfaceDecl. 904void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 905 ObjCImplementationDecl *ImplD) { 906 assert(IFaceD && ImplD && "Passed null params"); 907 ObjCImpls[IFaceD] = ImplD; 908} 909/// \brief Set the implementation of ObjCCategoryDecl. 910void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 911 ObjCCategoryImplDecl *ImplD) { 912 assert(CatD && ImplD && "Passed null params"); 913 ObjCImpls[CatD] = ImplD; 914} 915 916/// \brief Allocate an uninitialized DeclaratorInfo. 917/// 918/// The caller should initialize the memory held by DeclaratorInfo using 919/// the TypeLoc wrappers. 920/// 921/// \param T the type that will be the basis for type source info. This type 922/// should refer to how the declarator was written in source code, not to 923/// what type semantic analysis resolved the declarator to. 924DeclaratorInfo *ASTContext::CreateDeclaratorInfo(QualType T) { 925 unsigned DataSize = TypeLoc::getFullDataSizeForType(T); 926 DeclaratorInfo *DInfo = 927 (DeclaratorInfo*)BumpAlloc.Allocate(sizeof(DeclaratorInfo) + DataSize, 8); 928 new (DInfo) DeclaratorInfo(T); 929 return DInfo; 930} 931 932/// getInterfaceLayoutImpl - Get or compute information about the 933/// layout of the given interface. 934/// 935/// \param Impl - If given, also include the layout of the interface's 936/// implementation. This may differ by including synthesized ivars. 937const ASTRecordLayout & 938ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 939 const ObjCImplementationDecl *Impl) { 940 assert(!D->isForwardDecl() && "Invalid interface decl!"); 941 942 // Look up this layout, if already laid out, return what we have. 943 ObjCContainerDecl *Key = 944 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 945 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 946 return *Entry; 947 948 // Add in synthesized ivar count if laying out an implementation. 949 if (Impl) { 950 unsigned FieldCount = D->ivar_size(); 951 unsigned SynthCount = CountSynthesizedIvars(D); 952 FieldCount += SynthCount; 953 // If there aren't any sythesized ivars then reuse the interface 954 // entry. Note we can't cache this because we simply free all 955 // entries later; however we shouldn't look up implementations 956 // frequently. 957 if (SynthCount == 0) 958 return getObjCLayout(D, 0); 959 } 960 961 const ASTRecordLayout *NewEntry = 962 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 963 ObjCLayouts[Key] = NewEntry; 964 965 return *NewEntry; 966} 967 968const ASTRecordLayout & 969ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 970 return getObjCLayout(D, 0); 971} 972 973const ASTRecordLayout & 974ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 975 return getObjCLayout(D->getClassInterface(), D); 976} 977 978/// getASTRecordLayout - Get or compute information about the layout of the 979/// specified record (struct/union/class), which indicates its size and field 980/// position information. 981const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 982 D = D->getDefinition(*this); 983 assert(D && "Cannot get layout of forward declarations!"); 984 985 // Look up this layout, if already laid out, return what we have. 986 // Note that we can't save a reference to the entry because this function 987 // is recursive. 988 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 989 if (Entry) return *Entry; 990 991 const ASTRecordLayout *NewEntry = 992 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 993 ASTRecordLayouts[D] = NewEntry; 994 995 return *NewEntry; 996} 997 998//===----------------------------------------------------------------------===// 999// Type creation/memoization methods 1000//===----------------------------------------------------------------------===// 1001 1002QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1003 QualType CanT = getCanonicalType(T); 1004 if (CanT.getAddressSpace() == AddressSpace) 1005 return T; 1006 1007 // If we are composing extended qualifiers together, merge together into one 1008 // ExtQualType node. 1009 unsigned CVRQuals = T.getCVRQualifiers(); 1010 QualType::GCAttrTypes GCAttr = QualType::GCNone; 1011 Type *TypeNode = T.getTypePtr(); 1012 1013 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 1014 // If this type already has an address space specified, it cannot get 1015 // another one. 1016 assert(EQT->getAddressSpace() == 0 && 1017 "Type cannot be in multiple addr spaces!"); 1018 GCAttr = EQT->getObjCGCAttr(); 1019 TypeNode = EQT->getBaseType(); 1020 } 1021 1022 // Check if we've already instantiated this type. 1023 llvm::FoldingSetNodeID ID; 1024 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 1025 void *InsertPos = 0; 1026 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 1027 return QualType(EXTQy, CVRQuals); 1028 1029 // If the base type isn't canonical, this won't be a canonical type either, 1030 // so fill in the canonical type field. 1031 QualType Canonical; 1032 if (!TypeNode->isCanonical()) { 1033 Canonical = getAddrSpaceQualType(CanT, AddressSpace); 1034 1035 // Update InsertPos, the previous call could have invalidated it. 1036 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 1037 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1038 } 1039 ExtQualType *New = 1040 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 1041 ExtQualTypes.InsertNode(New, InsertPos); 1042 Types.push_back(New); 1043 return QualType(New, CVRQuals); 1044} 1045 1046QualType ASTContext::getObjCGCQualType(QualType T, 1047 QualType::GCAttrTypes GCAttr) { 1048 QualType CanT = getCanonicalType(T); 1049 if (CanT.getObjCGCAttr() == GCAttr) 1050 return T; 1051 1052 if (T->isPointerType()) { 1053 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1054 if (Pointee->isAnyPointerType()) { 1055 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1056 return getPointerType(ResultType); 1057 } 1058 } 1059 // If we are composing extended qualifiers together, merge together into one 1060 // ExtQualType node. 1061 unsigned CVRQuals = T.getCVRQualifiers(); 1062 Type *TypeNode = T.getTypePtr(); 1063 unsigned AddressSpace = 0; 1064 1065 if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) { 1066 // If this type already has an ObjCGC specified, it cannot get 1067 // another one. 1068 assert(EQT->getObjCGCAttr() == QualType::GCNone && 1069 "Type cannot have multiple ObjCGCs!"); 1070 AddressSpace = EQT->getAddressSpace(); 1071 TypeNode = EQT->getBaseType(); 1072 } 1073 1074 // Check if we've already instantiated an gc qual'd type of this type. 1075 llvm::FoldingSetNodeID ID; 1076 ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr); 1077 void *InsertPos = 0; 1078 if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 1079 return QualType(EXTQy, CVRQuals); 1080 1081 // If the base type isn't canonical, this won't be a canonical type either, 1082 // so fill in the canonical type field. 1083 // FIXME: Isn't this also not canonical if the base type is a array 1084 // or pointer type? I can't find any documentation for objc_gc, though... 1085 QualType Canonical; 1086 if (!T->isCanonical()) { 1087 Canonical = getObjCGCQualType(CanT, GCAttr); 1088 1089 // Update InsertPos, the previous call could have invalidated it. 1090 ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos); 1091 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1092 } 1093 ExtQualType *New = 1094 new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr); 1095 ExtQualTypes.InsertNode(New, InsertPos); 1096 Types.push_back(New); 1097 return QualType(New, CVRQuals); 1098} 1099 1100QualType ASTContext::getNoReturnType(QualType T) { 1101 QualifierSet qs; 1102 qs.strip(T); 1103 if (T->isPointerType()) { 1104 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1105 QualType ResultType = getNoReturnType(Pointee); 1106 ResultType = getPointerType(ResultType); 1107 ResultType.setCVRQualifiers(T.getCVRQualifiers()); 1108 return qs.apply(ResultType, *this); 1109 } 1110 if (T->isBlockPointerType()) { 1111 QualType Pointee = T->getAs<BlockPointerType>()->getPointeeType(); 1112 QualType ResultType = getNoReturnType(Pointee); 1113 ResultType = getBlockPointerType(ResultType); 1114 ResultType.setCVRQualifiers(T.getCVRQualifiers()); 1115 return qs.apply(ResultType, *this); 1116 } 1117 if (!T->isFunctionType()) 1118 assert(0 && "can't noreturn qualify non-pointer to function or block type"); 1119 1120 if (const FunctionNoProtoType *F = T->getAsFunctionNoProtoType()) { 1121 return getFunctionNoProtoType(F->getResultType(), true); 1122 } 1123 const FunctionProtoType *F = T->getAsFunctionProtoType(); 1124 return getFunctionType(F->getResultType(), F->arg_type_begin(), 1125 F->getNumArgs(), F->isVariadic(), F->getTypeQuals(), 1126 F->hasExceptionSpec(), F->hasAnyExceptionSpec(), 1127 F->getNumExceptions(), F->exception_begin(), true); 1128} 1129 1130/// getComplexType - Return the uniqued reference to the type for a complex 1131/// number with the specified element type. 1132QualType ASTContext::getComplexType(QualType T) { 1133 // Unique pointers, to guarantee there is only one pointer of a particular 1134 // structure. 1135 llvm::FoldingSetNodeID ID; 1136 ComplexType::Profile(ID, T); 1137 1138 void *InsertPos = 0; 1139 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1140 return QualType(CT, 0); 1141 1142 // If the pointee type isn't canonical, this won't be a canonical type either, 1143 // so fill in the canonical type field. 1144 QualType Canonical; 1145 if (!T->isCanonical()) { 1146 Canonical = getComplexType(getCanonicalType(T)); 1147 1148 // Get the new insert position for the node we care about. 1149 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1150 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1151 } 1152 ComplexType *New = new (*this,8) ComplexType(T, Canonical); 1153 Types.push_back(New); 1154 ComplexTypes.InsertNode(New, InsertPos); 1155 return QualType(New, 0); 1156} 1157 1158QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1159 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1160 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1161 FixedWidthIntType *&Entry = Map[Width]; 1162 if (!Entry) 1163 Entry = new FixedWidthIntType(Width, Signed); 1164 return QualType(Entry, 0); 1165} 1166 1167/// getPointerType - Return the uniqued reference to the type for a pointer to 1168/// the specified type. 1169QualType ASTContext::getPointerType(QualType T) { 1170 // Unique pointers, to guarantee there is only one pointer of a particular 1171 // structure. 1172 llvm::FoldingSetNodeID ID; 1173 PointerType::Profile(ID, T); 1174 1175 void *InsertPos = 0; 1176 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1177 return QualType(PT, 0); 1178 1179 // If the pointee type isn't canonical, this won't be a canonical type either, 1180 // so fill in the canonical type field. 1181 QualType Canonical; 1182 if (!T->isCanonical()) { 1183 Canonical = getPointerType(getCanonicalType(T)); 1184 1185 // Get the new insert position for the node we care about. 1186 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1187 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1188 } 1189 PointerType *New = new (*this,8) PointerType(T, Canonical); 1190 Types.push_back(New); 1191 PointerTypes.InsertNode(New, InsertPos); 1192 return QualType(New, 0); 1193} 1194 1195/// getBlockPointerType - Return the uniqued reference to the type for 1196/// a pointer to the specified block. 1197QualType ASTContext::getBlockPointerType(QualType T) { 1198 assert(T->isFunctionType() && "block of function types only"); 1199 // Unique pointers, to guarantee there is only one block of a particular 1200 // structure. 1201 llvm::FoldingSetNodeID ID; 1202 BlockPointerType::Profile(ID, T); 1203 1204 void *InsertPos = 0; 1205 if (BlockPointerType *PT = 1206 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1207 return QualType(PT, 0); 1208 1209 // If the block pointee type isn't canonical, this won't be a canonical 1210 // type either so fill in the canonical type field. 1211 QualType Canonical; 1212 if (!T->isCanonical()) { 1213 Canonical = getBlockPointerType(getCanonicalType(T)); 1214 1215 // Get the new insert position for the node we care about. 1216 BlockPointerType *NewIP = 1217 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1218 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1219 } 1220 BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical); 1221 Types.push_back(New); 1222 BlockPointerTypes.InsertNode(New, InsertPos); 1223 return QualType(New, 0); 1224} 1225 1226/// getLValueReferenceType - Return the uniqued reference to the type for an 1227/// lvalue reference to the specified type. 1228QualType ASTContext::getLValueReferenceType(QualType T) { 1229 // Unique pointers, to guarantee there is only one pointer of a particular 1230 // structure. 1231 llvm::FoldingSetNodeID ID; 1232 ReferenceType::Profile(ID, T); 1233 1234 void *InsertPos = 0; 1235 if (LValueReferenceType *RT = 1236 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1237 return QualType(RT, 0); 1238 1239 // If the referencee type isn't canonical, this won't be a canonical type 1240 // either, so fill in the canonical type field. 1241 QualType Canonical; 1242 if (!T->isCanonical()) { 1243 Canonical = getLValueReferenceType(getCanonicalType(T)); 1244 1245 // Get the new insert position for the node we care about. 1246 LValueReferenceType *NewIP = 1247 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1248 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1249 } 1250 1251 LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical); 1252 Types.push_back(New); 1253 LValueReferenceTypes.InsertNode(New, InsertPos); 1254 return QualType(New, 0); 1255} 1256 1257/// getRValueReferenceType - Return the uniqued reference to the type for an 1258/// rvalue reference to the specified type. 1259QualType ASTContext::getRValueReferenceType(QualType T) { 1260 // Unique pointers, to guarantee there is only one pointer of a particular 1261 // structure. 1262 llvm::FoldingSetNodeID ID; 1263 ReferenceType::Profile(ID, T); 1264 1265 void *InsertPos = 0; 1266 if (RValueReferenceType *RT = 1267 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1268 return QualType(RT, 0); 1269 1270 // If the referencee type isn't canonical, this won't be a canonical type 1271 // either, so fill in the canonical type field. 1272 QualType Canonical; 1273 if (!T->isCanonical()) { 1274 Canonical = getRValueReferenceType(getCanonicalType(T)); 1275 1276 // Get the new insert position for the node we care about. 1277 RValueReferenceType *NewIP = 1278 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1279 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1280 } 1281 1282 RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical); 1283 Types.push_back(New); 1284 RValueReferenceTypes.InsertNode(New, InsertPos); 1285 return QualType(New, 0); 1286} 1287 1288/// getMemberPointerType - Return the uniqued reference to the type for a 1289/// member pointer to the specified type, in the specified class. 1290QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) 1291{ 1292 // Unique pointers, to guarantee there is only one pointer of a particular 1293 // structure. 1294 llvm::FoldingSetNodeID ID; 1295 MemberPointerType::Profile(ID, T, Cls); 1296 1297 void *InsertPos = 0; 1298 if (MemberPointerType *PT = 1299 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1300 return QualType(PT, 0); 1301 1302 // If the pointee or class type isn't canonical, this won't be a canonical 1303 // type either, so fill in the canonical type field. 1304 QualType Canonical; 1305 if (!T->isCanonical()) { 1306 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1307 1308 // Get the new insert position for the node we care about. 1309 MemberPointerType *NewIP = 1310 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1311 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1312 } 1313 MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical); 1314 Types.push_back(New); 1315 MemberPointerTypes.InsertNode(New, InsertPos); 1316 return QualType(New, 0); 1317} 1318 1319/// getConstantArrayType - Return the unique reference to the type for an 1320/// array of the specified element type. 1321QualType ASTContext::getConstantArrayType(QualType EltTy, 1322 const llvm::APInt &ArySizeIn, 1323 ArrayType::ArraySizeModifier ASM, 1324 unsigned EltTypeQuals) { 1325 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1326 "Constant array of VLAs is illegal!"); 1327 1328 // Convert the array size into a canonical width matching the pointer size for 1329 // the target. 1330 llvm::APInt ArySize(ArySizeIn); 1331 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1332 1333 llvm::FoldingSetNodeID ID; 1334 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1335 1336 void *InsertPos = 0; 1337 if (ConstantArrayType *ATP = 1338 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1339 return QualType(ATP, 0); 1340 1341 // If the element type isn't canonical, this won't be a canonical type either, 1342 // so fill in the canonical type field. 1343 QualType Canonical; 1344 if (!EltTy->isCanonical()) { 1345 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1346 ASM, EltTypeQuals); 1347 // Get the new insert position for the node we care about. 1348 ConstantArrayType *NewIP = 1349 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1350 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1351 } 1352 1353 ConstantArrayType *New = 1354 new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1355 ConstantArrayTypes.InsertNode(New, InsertPos); 1356 Types.push_back(New); 1357 return QualType(New, 0); 1358} 1359 1360/// getConstantArrayWithExprType - Return a reference to the type for 1361/// an array of the specified element type. 1362QualType 1363ASTContext::getConstantArrayWithExprType(QualType EltTy, 1364 const llvm::APInt &ArySizeIn, 1365 Expr *ArySizeExpr, 1366 ArrayType::ArraySizeModifier ASM, 1367 unsigned EltTypeQuals, 1368 SourceRange Brackets) { 1369 // Convert the array size into a canonical width matching the pointer 1370 // size for the target. 1371 llvm::APInt ArySize(ArySizeIn); 1372 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1373 1374 // Compute the canonical ConstantArrayType. 1375 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1376 ArySize, ASM, EltTypeQuals); 1377 // Since we don't unique expressions, it isn't possible to unique VLA's 1378 // that have an expression provided for their size. 1379 ConstantArrayWithExprType *New = 1380 new(*this,8)ConstantArrayWithExprType(EltTy, Canonical, 1381 ArySize, ArySizeExpr, 1382 ASM, EltTypeQuals, Brackets); 1383 Types.push_back(New); 1384 return QualType(New, 0); 1385} 1386 1387/// getConstantArrayWithoutExprType - Return a reference to the type for 1388/// an array of the specified element type. 1389QualType 1390ASTContext::getConstantArrayWithoutExprType(QualType EltTy, 1391 const llvm::APInt &ArySizeIn, 1392 ArrayType::ArraySizeModifier ASM, 1393 unsigned EltTypeQuals) { 1394 // Convert the array size into a canonical width matching the pointer 1395 // size for the target. 1396 llvm::APInt ArySize(ArySizeIn); 1397 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1398 1399 // Compute the canonical ConstantArrayType. 1400 QualType Canonical = getConstantArrayType(getCanonicalType(EltTy), 1401 ArySize, ASM, EltTypeQuals); 1402 ConstantArrayWithoutExprType *New = 1403 new(*this,8)ConstantArrayWithoutExprType(EltTy, Canonical, 1404 ArySize, ASM, EltTypeQuals); 1405 Types.push_back(New); 1406 return QualType(New, 0); 1407} 1408 1409/// getVariableArrayType - Returns a non-unique reference to the type for a 1410/// variable array of the specified element type. 1411QualType ASTContext::getVariableArrayType(QualType EltTy, 1412 Expr *NumElts, 1413 ArrayType::ArraySizeModifier ASM, 1414 unsigned EltTypeQuals, 1415 SourceRange Brackets) { 1416 // Since we don't unique expressions, it isn't possible to unique VLA's 1417 // that have an expression provided for their size. 1418 1419 VariableArrayType *New = 1420 new(*this,8)VariableArrayType(EltTy, QualType(), 1421 NumElts, ASM, EltTypeQuals, Brackets); 1422 1423 VariableArrayTypes.push_back(New); 1424 Types.push_back(New); 1425 return QualType(New, 0); 1426} 1427 1428/// getDependentSizedArrayType - Returns a non-unique reference to 1429/// the type for a dependently-sized array of the specified element 1430/// type. 1431QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1432 Expr *NumElts, 1433 ArrayType::ArraySizeModifier ASM, 1434 unsigned EltTypeQuals, 1435 SourceRange Brackets) { 1436 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1437 "Size must be type- or value-dependent!"); 1438 1439 llvm::FoldingSetNodeID ID; 1440 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1441 EltTypeQuals, NumElts); 1442 1443 void *InsertPos = 0; 1444 DependentSizedArrayType *Canon 1445 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1446 DependentSizedArrayType *New; 1447 if (Canon) { 1448 // We already have a canonical version of this array type; use it as 1449 // the canonical type for a newly-built type. 1450 New = new (*this,8) DependentSizedArrayType(*this, EltTy, 1451 QualType(Canon, 0), 1452 NumElts, ASM, EltTypeQuals, 1453 Brackets); 1454 } else { 1455 QualType CanonEltTy = getCanonicalType(EltTy); 1456 if (CanonEltTy == EltTy) { 1457 New = new (*this,8) DependentSizedArrayType(*this, EltTy, QualType(), 1458 NumElts, ASM, EltTypeQuals, 1459 Brackets); 1460 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1461 } else { 1462 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1463 ASM, EltTypeQuals, 1464 SourceRange()); 1465 New = new (*this,8) DependentSizedArrayType(*this, EltTy, Canon, 1466 NumElts, ASM, EltTypeQuals, 1467 Brackets); 1468 } 1469 } 1470 1471 Types.push_back(New); 1472 return QualType(New, 0); 1473} 1474 1475QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1476 ArrayType::ArraySizeModifier ASM, 1477 unsigned EltTypeQuals) { 1478 llvm::FoldingSetNodeID ID; 1479 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1480 1481 void *InsertPos = 0; 1482 if (IncompleteArrayType *ATP = 1483 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1484 return QualType(ATP, 0); 1485 1486 // If the element type isn't canonical, this won't be a canonical type 1487 // either, so fill in the canonical type field. 1488 QualType Canonical; 1489 1490 if (!EltTy->isCanonical()) { 1491 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1492 ASM, EltTypeQuals); 1493 1494 // Get the new insert position for the node we care about. 1495 IncompleteArrayType *NewIP = 1496 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1497 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1498 } 1499 1500 IncompleteArrayType *New 1501 = new (*this,8) IncompleteArrayType(EltTy, Canonical, 1502 ASM, EltTypeQuals); 1503 1504 IncompleteArrayTypes.InsertNode(New, InsertPos); 1505 Types.push_back(New); 1506 return QualType(New, 0); 1507} 1508 1509/// getVectorType - Return the unique reference to a vector type of 1510/// the specified element type and size. VectorType must be a built-in type. 1511QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1512 BuiltinType *baseType; 1513 1514 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1515 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1516 1517 // Check if we've already instantiated a vector of this type. 1518 llvm::FoldingSetNodeID ID; 1519 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1520 void *InsertPos = 0; 1521 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1522 return QualType(VTP, 0); 1523 1524 // If the element type isn't canonical, this won't be a canonical type either, 1525 // so fill in the canonical type field. 1526 QualType Canonical; 1527 if (!vecType->isCanonical()) { 1528 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1529 1530 // Get the new insert position for the node we care about. 1531 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1532 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1533 } 1534 VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical); 1535 VectorTypes.InsertNode(New, InsertPos); 1536 Types.push_back(New); 1537 return QualType(New, 0); 1538} 1539 1540/// getExtVectorType - Return the unique reference to an extended vector type of 1541/// the specified element type and size. VectorType must be a built-in type. 1542QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1543 BuiltinType *baseType; 1544 1545 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1546 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1547 1548 // Check if we've already instantiated a vector of this type. 1549 llvm::FoldingSetNodeID ID; 1550 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1551 void *InsertPos = 0; 1552 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1553 return QualType(VTP, 0); 1554 1555 // If the element type isn't canonical, this won't be a canonical type either, 1556 // so fill in the canonical type field. 1557 QualType Canonical; 1558 if (!vecType->isCanonical()) { 1559 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1560 1561 // Get the new insert position for the node we care about. 1562 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1563 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1564 } 1565 ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical); 1566 VectorTypes.InsertNode(New, InsertPos); 1567 Types.push_back(New); 1568 return QualType(New, 0); 1569} 1570 1571QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1572 Expr *SizeExpr, 1573 SourceLocation AttrLoc) { 1574 llvm::FoldingSetNodeID ID; 1575 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1576 SizeExpr); 1577 1578 void *InsertPos = 0; 1579 DependentSizedExtVectorType *Canon 1580 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1581 DependentSizedExtVectorType *New; 1582 if (Canon) { 1583 // We already have a canonical version of this array type; use it as 1584 // the canonical type for a newly-built type. 1585 New = new (*this,8) DependentSizedExtVectorType(*this, vecType, 1586 QualType(Canon, 0), 1587 SizeExpr, AttrLoc); 1588 } else { 1589 QualType CanonVecTy = getCanonicalType(vecType); 1590 if (CanonVecTy == vecType) { 1591 New = new (*this,8) DependentSizedExtVectorType(*this, vecType, 1592 QualType(), SizeExpr, 1593 AttrLoc); 1594 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1595 } else { 1596 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1597 SourceLocation()); 1598 New = new (*this,8) DependentSizedExtVectorType(*this, vecType, Canon, 1599 SizeExpr, AttrLoc); 1600 } 1601 } 1602 1603 Types.push_back(New); 1604 return QualType(New, 0); 1605} 1606 1607/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1608/// 1609QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1610 // Unique functions, to guarantee there is only one function of a particular 1611 // structure. 1612 llvm::FoldingSetNodeID ID; 1613 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1614 1615 void *InsertPos = 0; 1616 if (FunctionNoProtoType *FT = 1617 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1618 return QualType(FT, 0); 1619 1620 QualType Canonical; 1621 if (!ResultTy->isCanonical()) { 1622 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1623 1624 // Get the new insert position for the node we care about. 1625 FunctionNoProtoType *NewIP = 1626 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1627 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1628 } 1629 1630 FunctionNoProtoType *New 1631 = new (*this,8) FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1632 Types.push_back(New); 1633 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1634 return QualType(New, 0); 1635} 1636 1637/// getFunctionType - Return a normal function type with a typed argument 1638/// list. isVariadic indicates whether the argument list includes '...'. 1639QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1640 unsigned NumArgs, bool isVariadic, 1641 unsigned TypeQuals, bool hasExceptionSpec, 1642 bool hasAnyExceptionSpec, unsigned NumExs, 1643 const QualType *ExArray, bool NoReturn) { 1644 // Unique functions, to guarantee there is only one function of a particular 1645 // structure. 1646 llvm::FoldingSetNodeID ID; 1647 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1648 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1649 NumExs, ExArray, NoReturn); 1650 1651 void *InsertPos = 0; 1652 if (FunctionProtoType *FTP = 1653 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1654 return QualType(FTP, 0); 1655 1656 // Determine whether the type being created is already canonical or not. 1657 bool isCanonical = ResultTy->isCanonical(); 1658 if (hasExceptionSpec) 1659 isCanonical = false; 1660 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1661 if (!ArgArray[i]->isCanonical()) 1662 isCanonical = false; 1663 1664 // If this type isn't canonical, get the canonical version of it. 1665 // The exception spec is not part of the canonical type. 1666 QualType Canonical; 1667 if (!isCanonical) { 1668 llvm::SmallVector<QualType, 16> CanonicalArgs; 1669 CanonicalArgs.reserve(NumArgs); 1670 for (unsigned i = 0; i != NumArgs; ++i) 1671 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1672 1673 Canonical = getFunctionType(getCanonicalType(ResultTy), 1674 CanonicalArgs.data(), NumArgs, 1675 isVariadic, TypeQuals, false, 1676 false, 0, 0, NoReturn); 1677 1678 // Get the new insert position for the node we care about. 1679 FunctionProtoType *NewIP = 1680 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1681 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1682 } 1683 1684 // FunctionProtoType objects are allocated with extra bytes after them 1685 // for two variable size arrays (for parameter and exception types) at the 1686 // end of them. 1687 FunctionProtoType *FTP = 1688 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1689 NumArgs*sizeof(QualType) + 1690 NumExs*sizeof(QualType), 8); 1691 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1692 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1693 ExArray, NumExs, Canonical, NoReturn); 1694 Types.push_back(FTP); 1695 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1696 return QualType(FTP, 0); 1697} 1698 1699/// getTypeDeclType - Return the unique reference to the type for the 1700/// specified type declaration. 1701QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1702 assert(Decl && "Passed null for Decl param"); 1703 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1704 1705 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1706 return getTypedefType(Typedef); 1707 else if (isa<TemplateTypeParmDecl>(Decl)) { 1708 assert(false && "Template type parameter types are always available."); 1709 } else if (ObjCInterfaceDecl *ObjCInterface 1710 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1711 return getObjCInterfaceType(ObjCInterface); 1712 1713 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1714 if (PrevDecl) 1715 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1716 else 1717 Decl->TypeForDecl = new (*this,8) RecordType(Record); 1718 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1719 if (PrevDecl) 1720 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1721 else 1722 Decl->TypeForDecl = new (*this,8) EnumType(Enum); 1723 } else 1724 assert(false && "TypeDecl without a type?"); 1725 1726 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1727 return QualType(Decl->TypeForDecl, 0); 1728} 1729 1730/// getTypedefType - Return the unique reference to the type for the 1731/// specified typename decl. 1732QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1733 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1734 1735 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1736 Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical); 1737 Types.push_back(Decl->TypeForDecl); 1738 return QualType(Decl->TypeForDecl, 0); 1739} 1740 1741/// \brief Retrieve the template type parameter type for a template 1742/// parameter or parameter pack with the given depth, index, and (optionally) 1743/// name. 1744QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1745 bool ParameterPack, 1746 IdentifierInfo *Name) { 1747 llvm::FoldingSetNodeID ID; 1748 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1749 void *InsertPos = 0; 1750 TemplateTypeParmType *TypeParm 1751 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1752 1753 if (TypeParm) 1754 return QualType(TypeParm, 0); 1755 1756 if (Name) { 1757 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1758 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack, 1759 Name, Canon); 1760 } else 1761 TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, ParameterPack); 1762 1763 Types.push_back(TypeParm); 1764 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1765 1766 return QualType(TypeParm, 0); 1767} 1768 1769QualType 1770ASTContext::getTemplateSpecializationType(TemplateName Template, 1771 const TemplateArgument *Args, 1772 unsigned NumArgs, 1773 QualType Canon) { 1774 if (!Canon.isNull()) 1775 Canon = getCanonicalType(Canon); 1776 else { 1777 // Build the canonical template specialization type. 1778 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1779 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1780 CanonArgs.reserve(NumArgs); 1781 for (unsigned I = 0; I != NumArgs; ++I) 1782 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1783 1784 // Determine whether this canonical template specialization type already 1785 // exists. 1786 llvm::FoldingSetNodeID ID; 1787 TemplateSpecializationType::Profile(ID, CanonTemplate, 1788 CanonArgs.data(), NumArgs, *this); 1789 1790 void *InsertPos = 0; 1791 TemplateSpecializationType *Spec 1792 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1793 1794 if (!Spec) { 1795 // Allocate a new canonical template specialization type. 1796 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1797 sizeof(TemplateArgument) * NumArgs), 1798 8); 1799 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1800 CanonArgs.data(), NumArgs, 1801 Canon); 1802 Types.push_back(Spec); 1803 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1804 } 1805 1806 if (Canon.isNull()) 1807 Canon = QualType(Spec, 0); 1808 assert(Canon->isDependentType() && 1809 "Non-dependent template-id type must have a canonical type"); 1810 } 1811 1812 // Allocate the (non-canonical) template specialization type, but don't 1813 // try to unique it: these types typically have location information that 1814 // we don't unique and don't want to lose. 1815 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1816 sizeof(TemplateArgument) * NumArgs), 1817 8); 1818 TemplateSpecializationType *Spec 1819 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1820 Canon); 1821 1822 Types.push_back(Spec); 1823 return QualType(Spec, 0); 1824} 1825 1826QualType 1827ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1828 QualType NamedType) { 1829 llvm::FoldingSetNodeID ID; 1830 QualifiedNameType::Profile(ID, NNS, NamedType); 1831 1832 void *InsertPos = 0; 1833 QualifiedNameType *T 1834 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1835 if (T) 1836 return QualType(T, 0); 1837 1838 T = new (*this) QualifiedNameType(NNS, NamedType, 1839 getCanonicalType(NamedType)); 1840 Types.push_back(T); 1841 QualifiedNameTypes.InsertNode(T, InsertPos); 1842 return QualType(T, 0); 1843} 1844 1845QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1846 const IdentifierInfo *Name, 1847 QualType Canon) { 1848 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1849 1850 if (Canon.isNull()) { 1851 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1852 if (CanonNNS != NNS) 1853 Canon = getTypenameType(CanonNNS, Name); 1854 } 1855 1856 llvm::FoldingSetNodeID ID; 1857 TypenameType::Profile(ID, NNS, Name); 1858 1859 void *InsertPos = 0; 1860 TypenameType *T 1861 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1862 if (T) 1863 return QualType(T, 0); 1864 1865 T = new (*this) TypenameType(NNS, Name, Canon); 1866 Types.push_back(T); 1867 TypenameTypes.InsertNode(T, InsertPos); 1868 return QualType(T, 0); 1869} 1870 1871QualType 1872ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1873 const TemplateSpecializationType *TemplateId, 1874 QualType Canon) { 1875 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1876 1877 if (Canon.isNull()) { 1878 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1879 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1880 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1881 const TemplateSpecializationType *CanonTemplateId 1882 = CanonType->getAsTemplateSpecializationType(); 1883 assert(CanonTemplateId && 1884 "Canonical type must also be a template specialization type"); 1885 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1886 } 1887 } 1888 1889 llvm::FoldingSetNodeID ID; 1890 TypenameType::Profile(ID, NNS, TemplateId); 1891 1892 void *InsertPos = 0; 1893 TypenameType *T 1894 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1895 if (T) 1896 return QualType(T, 0); 1897 1898 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1899 Types.push_back(T); 1900 TypenameTypes.InsertNode(T, InsertPos); 1901 return QualType(T, 0); 1902} 1903 1904/// CmpProtocolNames - Comparison predicate for sorting protocols 1905/// alphabetically. 1906static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1907 const ObjCProtocolDecl *RHS) { 1908 return LHS->getDeclName() < RHS->getDeclName(); 1909} 1910 1911static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1912 unsigned &NumProtocols) { 1913 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1914 1915 // Sort protocols, keyed by name. 1916 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1917 1918 // Remove duplicates. 1919 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1920 NumProtocols = ProtocolsEnd-Protocols; 1921} 1922 1923/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1924/// the given interface decl and the conforming protocol list. 1925QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1926 ObjCProtocolDecl **Protocols, 1927 unsigned NumProtocols) { 1928 // Sort the protocol list alphabetically to canonicalize it. 1929 if (NumProtocols) 1930 SortAndUniqueProtocols(Protocols, NumProtocols); 1931 1932 llvm::FoldingSetNodeID ID; 1933 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1934 1935 void *InsertPos = 0; 1936 if (ObjCObjectPointerType *QT = 1937 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1938 return QualType(QT, 0); 1939 1940 // No Match; 1941 ObjCObjectPointerType *QType = 1942 new (*this,8) ObjCObjectPointerType(InterfaceT, Protocols, NumProtocols); 1943 1944 Types.push_back(QType); 1945 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1946 return QualType(QType, 0); 1947} 1948 1949/// getObjCInterfaceType - Return the unique reference to the type for the 1950/// specified ObjC interface decl. The list of protocols is optional. 1951QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1952 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1953 if (NumProtocols) 1954 // Sort the protocol list alphabetically to canonicalize it. 1955 SortAndUniqueProtocols(Protocols, NumProtocols); 1956 1957 llvm::FoldingSetNodeID ID; 1958 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1959 1960 void *InsertPos = 0; 1961 if (ObjCInterfaceType *QT = 1962 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1963 return QualType(QT, 0); 1964 1965 // No Match; 1966 ObjCInterfaceType *QType = 1967 new (*this,8) ObjCInterfaceType(const_cast<ObjCInterfaceDecl*>(Decl), 1968 Protocols, NumProtocols); 1969 Types.push_back(QType); 1970 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 1971 return QualType(QType, 0); 1972} 1973 1974/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 1975/// TypeOfExprType AST's (since expression's are never shared). For example, 1976/// multiple declarations that refer to "typeof(x)" all contain different 1977/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1978/// on canonical type's (which are always unique). 1979QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 1980 TypeOfExprType *toe; 1981 if (tofExpr->isTypeDependent()) { 1982 llvm::FoldingSetNodeID ID; 1983 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 1984 1985 void *InsertPos = 0; 1986 DependentTypeOfExprType *Canon 1987 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 1988 if (Canon) { 1989 // We already have a "canonical" version of an identical, dependent 1990 // typeof(expr) type. Use that as our canonical type. 1991 toe = new (*this, 8) TypeOfExprType(tofExpr, 1992 QualType((TypeOfExprType*)Canon, 0)); 1993 } 1994 else { 1995 // Build a new, canonical typeof(expr) type. 1996 Canon = new (*this, 8) DependentTypeOfExprType(*this, tofExpr); 1997 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 1998 toe = Canon; 1999 } 2000 } else { 2001 QualType Canonical = getCanonicalType(tofExpr->getType()); 2002 toe = new (*this,8) TypeOfExprType(tofExpr, Canonical); 2003 } 2004 Types.push_back(toe); 2005 return QualType(toe, 0); 2006} 2007 2008/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2009/// TypeOfType AST's. The only motivation to unique these nodes would be 2010/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2011/// an issue. This doesn't effect the type checker, since it operates 2012/// on canonical type's (which are always unique). 2013QualType ASTContext::getTypeOfType(QualType tofType) { 2014 QualType Canonical = getCanonicalType(tofType); 2015 TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical); 2016 Types.push_back(tot); 2017 return QualType(tot, 0); 2018} 2019 2020/// getDecltypeForExpr - Given an expr, will return the decltype for that 2021/// expression, according to the rules in C++0x [dcl.type.simple]p4 2022static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2023 if (e->isTypeDependent()) 2024 return Context.DependentTy; 2025 2026 // If e is an id expression or a class member access, decltype(e) is defined 2027 // as the type of the entity named by e. 2028 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2029 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2030 return VD->getType(); 2031 } 2032 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2033 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2034 return FD->getType(); 2035 } 2036 // If e is a function call or an invocation of an overloaded operator, 2037 // (parentheses around e are ignored), decltype(e) is defined as the 2038 // return type of that function. 2039 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2040 return CE->getCallReturnType(); 2041 2042 QualType T = e->getType(); 2043 2044 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2045 // defined as T&, otherwise decltype(e) is defined as T. 2046 if (e->isLvalue(Context) == Expr::LV_Valid) 2047 T = Context.getLValueReferenceType(T); 2048 2049 return T; 2050} 2051 2052/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2053/// DecltypeType AST's. The only motivation to unique these nodes would be 2054/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2055/// an issue. This doesn't effect the type checker, since it operates 2056/// on canonical type's (which are always unique). 2057QualType ASTContext::getDecltypeType(Expr *e) { 2058 DecltypeType *dt; 2059 if (e->isTypeDependent()) { 2060 llvm::FoldingSetNodeID ID; 2061 DependentDecltypeType::Profile(ID, *this, e); 2062 2063 void *InsertPos = 0; 2064 DependentDecltypeType *Canon 2065 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2066 if (Canon) { 2067 // We already have a "canonical" version of an equivalent, dependent 2068 // decltype type. Use that as our canonical type. 2069 dt = new (*this, 8) DecltypeType(e, DependentTy, 2070 QualType((DecltypeType*)Canon, 0)); 2071 } 2072 else { 2073 // Build a new, canonical typeof(expr) type. 2074 Canon = new (*this, 8) DependentDecltypeType(*this, e); 2075 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2076 dt = Canon; 2077 } 2078 } else { 2079 QualType T = getDecltypeForExpr(e, *this); 2080 dt = new (*this, 8) DecltypeType(e, T, getCanonicalType(T)); 2081 } 2082 Types.push_back(dt); 2083 return QualType(dt, 0); 2084} 2085 2086/// getTagDeclType - Return the unique reference to the type for the 2087/// specified TagDecl (struct/union/class/enum) decl. 2088QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2089 assert (Decl); 2090 // FIXME: What is the design on getTagDeclType when it requires casting 2091 // away const? mutable? 2092 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2093} 2094 2095/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2096/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2097/// needs to agree with the definition in <stddef.h>. 2098QualType ASTContext::getSizeType() const { 2099 return getFromTargetType(Target.getSizeType()); 2100} 2101 2102/// getSignedWCharType - Return the type of "signed wchar_t". 2103/// Used when in C++, as a GCC extension. 2104QualType ASTContext::getSignedWCharType() const { 2105 // FIXME: derive from "Target" ? 2106 return WCharTy; 2107} 2108 2109/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2110/// Used when in C++, as a GCC extension. 2111QualType ASTContext::getUnsignedWCharType() const { 2112 // FIXME: derive from "Target" ? 2113 return UnsignedIntTy; 2114} 2115 2116/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2117/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2118QualType ASTContext::getPointerDiffType() const { 2119 return getFromTargetType(Target.getPtrDiffType(0)); 2120} 2121 2122//===----------------------------------------------------------------------===// 2123// Type Operators 2124//===----------------------------------------------------------------------===// 2125 2126/// getCanonicalType - Return the canonical (structural) type corresponding to 2127/// the specified potentially non-canonical type. The non-canonical version 2128/// of a type may have many "decorated" versions of types. Decorators can 2129/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2130/// to be free of any of these, allowing two canonical types to be compared 2131/// for exact equality with a simple pointer comparison. 2132CanQualType ASTContext::getCanonicalType(QualType T) { 2133 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 2134 2135 // If the result has type qualifiers, make sure to canonicalize them as well. 2136 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 2137 if (TypeQuals == 0) 2138 return CanQualType::CreateUnsafe(CanType); 2139 2140 // If the type qualifiers are on an array type, get the canonical type of the 2141 // array with the qualifiers applied to the element type. 2142 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2143 if (!AT) 2144 return CanQualType::CreateUnsafe(CanType.getQualifiedType(TypeQuals)); 2145 2146 // Get the canonical version of the element with the extra qualifiers on it. 2147 // This can recursively sink qualifiers through multiple levels of arrays. 2148 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 2149 NewEltTy = getCanonicalType(NewEltTy); 2150 2151 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2152 return CanQualType::CreateUnsafe( 2153 getConstantArrayType(NewEltTy, CAT->getSize(), 2154 CAT->getSizeModifier(), 2155 CAT->getIndexTypeQualifier())); 2156 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2157 return CanQualType::CreateUnsafe( 2158 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2159 IAT->getIndexTypeQualifier())); 2160 2161 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2162 return CanQualType::CreateUnsafe( 2163 getDependentSizedArrayType(NewEltTy, 2164 DSAT->getSizeExpr() ? 2165 DSAT->getSizeExpr()->Retain() : 0, 2166 DSAT->getSizeModifier(), 2167 DSAT->getIndexTypeQualifier(), 2168 DSAT->getBracketsRange())); 2169 2170 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2171 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2172 VAT->getSizeExpr() ? 2173 VAT->getSizeExpr()->Retain() : 0, 2174 VAT->getSizeModifier(), 2175 VAT->getIndexTypeQualifier(), 2176 VAT->getBracketsRange())); 2177} 2178 2179TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2180 // If this template name refers to a template, the canonical 2181 // template name merely stores the template itself. 2182 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2183 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2184 2185 // If this template name refers to a set of overloaded function templates, 2186 /// the canonical template name merely stores the set of function templates. 2187 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) { 2188 OverloadedFunctionDecl *CanonOvl = 0; 2189 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 2190 FEnd = Ovl->function_end(); 2191 F != FEnd; ++F) { 2192 Decl *Canon = F->get()->getCanonicalDecl(); 2193 if (CanonOvl || Canon != F->get()) { 2194 if (!CanonOvl) 2195 CanonOvl = OverloadedFunctionDecl::Create(*this, 2196 Ovl->getDeclContext(), 2197 Ovl->getDeclName()); 2198 2199 CanonOvl->addOverload( 2200 AnyFunctionDecl::getFromNamedDecl(cast<NamedDecl>(Canon))); 2201 } 2202 } 2203 2204 return TemplateName(CanonOvl? CanonOvl : Ovl); 2205 } 2206 2207 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2208 assert(DTN && "Non-dependent template names must refer to template decls."); 2209 return DTN->CanonicalTemplateName; 2210} 2211 2212TemplateArgument 2213ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2214 switch (Arg.getKind()) { 2215 case TemplateArgument::Null: 2216 return Arg; 2217 2218 case TemplateArgument::Expression: 2219 // FIXME: Build canonical expression? 2220 return Arg; 2221 2222 case TemplateArgument::Declaration: 2223 return TemplateArgument(SourceLocation(), 2224 Arg.getAsDecl()->getCanonicalDecl()); 2225 2226 case TemplateArgument::Integral: 2227 return TemplateArgument(SourceLocation(), 2228 *Arg.getAsIntegral(), 2229 getCanonicalType(Arg.getIntegralType())); 2230 2231 case TemplateArgument::Type: 2232 return TemplateArgument(SourceLocation(), 2233 getCanonicalType(Arg.getAsType())); 2234 2235 case TemplateArgument::Pack: { 2236 // FIXME: Allocate in ASTContext 2237 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2238 unsigned Idx = 0; 2239 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2240 AEnd = Arg.pack_end(); 2241 A != AEnd; (void)++A, ++Idx) 2242 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2243 2244 TemplateArgument Result; 2245 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2246 return Result; 2247 } 2248 } 2249 2250 // Silence GCC warning 2251 assert(false && "Unhandled template argument kind"); 2252 return TemplateArgument(); 2253} 2254 2255NestedNameSpecifier * 2256ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2257 if (!NNS) 2258 return 0; 2259 2260 switch (NNS->getKind()) { 2261 case NestedNameSpecifier::Identifier: 2262 // Canonicalize the prefix but keep the identifier the same. 2263 return NestedNameSpecifier::Create(*this, 2264 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2265 NNS->getAsIdentifier()); 2266 2267 case NestedNameSpecifier::Namespace: 2268 // A namespace is canonical; build a nested-name-specifier with 2269 // this namespace and no prefix. 2270 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2271 2272 case NestedNameSpecifier::TypeSpec: 2273 case NestedNameSpecifier::TypeSpecWithTemplate: { 2274 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2275 return NestedNameSpecifier::Create(*this, 0, 2276 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2277 T.getTypePtr()); 2278 } 2279 2280 case NestedNameSpecifier::Global: 2281 // The global specifier is canonical and unique. 2282 return NNS; 2283 } 2284 2285 // Required to silence a GCC warning 2286 return 0; 2287} 2288 2289 2290const ArrayType *ASTContext::getAsArrayType(QualType T) { 2291 // Handle the non-qualified case efficiently. 2292 if (T.getCVRQualifiers() == 0) { 2293 // Handle the common positive case fast. 2294 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2295 return AT; 2296 } 2297 2298 // Handle the common negative case fast, ignoring CVR qualifiers. 2299 QualType CType = T->getCanonicalTypeInternal(); 2300 2301 // Make sure to look through type qualifiers (like ExtQuals) for the negative 2302 // test. 2303 if (!isa<ArrayType>(CType) && 2304 !isa<ArrayType>(CType.getUnqualifiedType())) 2305 return 0; 2306 2307 // Apply any CVR qualifiers from the array type to the element type. This 2308 // implements C99 6.7.3p8: "If the specification of an array type includes 2309 // any type qualifiers, the element type is so qualified, not the array type." 2310 2311 // If we get here, we either have type qualifiers on the type, or we have 2312 // sugar such as a typedef in the way. If we have type qualifiers on the type 2313 // we must propagate them down into the element type. 2314 unsigned CVRQuals = T.getCVRQualifiers(); 2315 unsigned AddrSpace = 0; 2316 Type *Ty = T.getTypePtr(); 2317 2318 // Rip through ExtQualType's and typedefs to get to a concrete type. 2319 while (1) { 2320 if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) { 2321 AddrSpace = EXTQT->getAddressSpace(); 2322 Ty = EXTQT->getBaseType(); 2323 } else { 2324 T = Ty->getDesugaredType(); 2325 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 2326 break; 2327 CVRQuals |= T.getCVRQualifiers(); 2328 Ty = T.getTypePtr(); 2329 } 2330 } 2331 2332 // If we have a simple case, just return now. 2333 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2334 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 2335 return ATy; 2336 2337 // Otherwise, we have an array and we have qualifiers on it. Push the 2338 // qualifiers into the array element type and return a new array type. 2339 // Get the canonical version of the element with the extra qualifiers on it. 2340 // This can recursively sink qualifiers through multiple levels of arrays. 2341 QualType NewEltTy = ATy->getElementType(); 2342 if (AddrSpace) 2343 NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace); 2344 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 2345 2346 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2347 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2348 CAT->getSizeModifier(), 2349 CAT->getIndexTypeQualifier())); 2350 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2351 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2352 IAT->getSizeModifier(), 2353 IAT->getIndexTypeQualifier())); 2354 2355 if (const DependentSizedArrayType *DSAT 2356 = dyn_cast<DependentSizedArrayType>(ATy)) 2357 return cast<ArrayType>( 2358 getDependentSizedArrayType(NewEltTy, 2359 DSAT->getSizeExpr() ? 2360 DSAT->getSizeExpr()->Retain() : 0, 2361 DSAT->getSizeModifier(), 2362 DSAT->getIndexTypeQualifier(), 2363 DSAT->getBracketsRange())); 2364 2365 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2366 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2367 VAT->getSizeExpr() ? 2368 VAT->getSizeExpr()->Retain() : 0, 2369 VAT->getSizeModifier(), 2370 VAT->getIndexTypeQualifier(), 2371 VAT->getBracketsRange())); 2372} 2373 2374 2375/// getArrayDecayedType - Return the properly qualified result of decaying the 2376/// specified array type to a pointer. This operation is non-trivial when 2377/// handling typedefs etc. The canonical type of "T" must be an array type, 2378/// this returns a pointer to a properly qualified element of the array. 2379/// 2380/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2381QualType ASTContext::getArrayDecayedType(QualType Ty) { 2382 // Get the element type with 'getAsArrayType' so that we don't lose any 2383 // typedefs in the element type of the array. This also handles propagation 2384 // of type qualifiers from the array type into the element type if present 2385 // (C99 6.7.3p8). 2386 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2387 assert(PrettyArrayType && "Not an array type!"); 2388 2389 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2390 2391 // int x[restrict 4] -> int *restrict 2392 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 2393} 2394 2395QualType ASTContext::getBaseElementType(QualType QT) { 2396 QualifierSet qualifiers; 2397 while (true) { 2398 const Type *UT = qualifiers.strip(QT); 2399 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2400 QT = AT->getElementType(); 2401 } else { 2402 return qualifiers.apply(QT, *this); 2403 } 2404 } 2405} 2406 2407QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 2408 QualType ElemTy = VAT->getElementType(); 2409 2410 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 2411 return getBaseElementType(VAT); 2412 2413 return ElemTy; 2414} 2415 2416/// getConstantArrayElementCount - Returns number of constant array elements. 2417uint64_t 2418ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2419 uint64_t ElementCount = 1; 2420 do { 2421 ElementCount *= CA->getSize().getZExtValue(); 2422 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2423 } while (CA); 2424 return ElementCount; 2425} 2426 2427/// getFloatingRank - Return a relative rank for floating point types. 2428/// This routine will assert if passed a built-in type that isn't a float. 2429static FloatingRank getFloatingRank(QualType T) { 2430 if (const ComplexType *CT = T->getAsComplexType()) 2431 return getFloatingRank(CT->getElementType()); 2432 2433 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 2434 switch (T->getAsBuiltinType()->getKind()) { 2435 default: assert(0 && "getFloatingRank(): not a floating type"); 2436 case BuiltinType::Float: return FloatRank; 2437 case BuiltinType::Double: return DoubleRank; 2438 case BuiltinType::LongDouble: return LongDoubleRank; 2439 } 2440} 2441 2442/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2443/// point or a complex type (based on typeDomain/typeSize). 2444/// 'typeDomain' is a real floating point or complex type. 2445/// 'typeSize' is a real floating point or complex type. 2446QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2447 QualType Domain) const { 2448 FloatingRank EltRank = getFloatingRank(Size); 2449 if (Domain->isComplexType()) { 2450 switch (EltRank) { 2451 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2452 case FloatRank: return FloatComplexTy; 2453 case DoubleRank: return DoubleComplexTy; 2454 case LongDoubleRank: return LongDoubleComplexTy; 2455 } 2456 } 2457 2458 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2459 switch (EltRank) { 2460 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2461 case FloatRank: return FloatTy; 2462 case DoubleRank: return DoubleTy; 2463 case LongDoubleRank: return LongDoubleTy; 2464 } 2465} 2466 2467/// getFloatingTypeOrder - Compare the rank of the two specified floating 2468/// point types, ignoring the domain of the type (i.e. 'double' == 2469/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2470/// LHS < RHS, return -1. 2471int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2472 FloatingRank LHSR = getFloatingRank(LHS); 2473 FloatingRank RHSR = getFloatingRank(RHS); 2474 2475 if (LHSR == RHSR) 2476 return 0; 2477 if (LHSR > RHSR) 2478 return 1; 2479 return -1; 2480} 2481 2482/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2483/// routine will assert if passed a built-in type that isn't an integer or enum, 2484/// or if it is not canonicalized. 2485unsigned ASTContext::getIntegerRank(Type *T) { 2486 assert(T->isCanonical() && "T should be canonicalized"); 2487 if (EnumType* ET = dyn_cast<EnumType>(T)) 2488 T = ET->getDecl()->getIntegerType().getTypePtr(); 2489 2490 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2491 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2492 2493 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2494 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2495 2496 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2497 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2498 2499 // There are two things which impact the integer rank: the width, and 2500 // the ordering of builtins. The builtin ordering is encoded in the 2501 // bottom three bits; the width is encoded in the bits above that. 2502 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2503 return FWIT->getWidth() << 3; 2504 2505 switch (cast<BuiltinType>(T)->getKind()) { 2506 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2507 case BuiltinType::Bool: 2508 return 1 + (getIntWidth(BoolTy) << 3); 2509 case BuiltinType::Char_S: 2510 case BuiltinType::Char_U: 2511 case BuiltinType::SChar: 2512 case BuiltinType::UChar: 2513 return 2 + (getIntWidth(CharTy) << 3); 2514 case BuiltinType::Short: 2515 case BuiltinType::UShort: 2516 return 3 + (getIntWidth(ShortTy) << 3); 2517 case BuiltinType::Int: 2518 case BuiltinType::UInt: 2519 return 4 + (getIntWidth(IntTy) << 3); 2520 case BuiltinType::Long: 2521 case BuiltinType::ULong: 2522 return 5 + (getIntWidth(LongTy) << 3); 2523 case BuiltinType::LongLong: 2524 case BuiltinType::ULongLong: 2525 return 6 + (getIntWidth(LongLongTy) << 3); 2526 case BuiltinType::Int128: 2527 case BuiltinType::UInt128: 2528 return 7 + (getIntWidth(Int128Ty) << 3); 2529 } 2530} 2531 2532/// \brief Whether this is a promotable bitfield reference according 2533/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2534/// 2535/// \returns the type this bit-field will promote to, or NULL if no 2536/// promotion occurs. 2537QualType ASTContext::isPromotableBitField(Expr *E) { 2538 FieldDecl *Field = E->getBitField(); 2539 if (!Field) 2540 return QualType(); 2541 2542 QualType FT = Field->getType(); 2543 2544 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2545 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2546 uint64_t IntSize = getTypeSize(IntTy); 2547 // GCC extension compatibility: if the bit-field size is less than or equal 2548 // to the size of int, it gets promoted no matter what its type is. 2549 // For instance, unsigned long bf : 4 gets promoted to signed int. 2550 if (BitWidth < IntSize) 2551 return IntTy; 2552 2553 if (BitWidth == IntSize) 2554 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2555 2556 // Types bigger than int are not subject to promotions, and therefore act 2557 // like the base type. 2558 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2559 // is ridiculous. 2560 return QualType(); 2561} 2562 2563/// getPromotedIntegerType - Returns the type that Promotable will 2564/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2565/// integer type. 2566QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2567 assert(!Promotable.isNull()); 2568 assert(Promotable->isPromotableIntegerType()); 2569 if (Promotable->isSignedIntegerType()) 2570 return IntTy; 2571 uint64_t PromotableSize = getTypeSize(Promotable); 2572 uint64_t IntSize = getTypeSize(IntTy); 2573 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2574 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2575} 2576 2577/// getIntegerTypeOrder - Returns the highest ranked integer type: 2578/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2579/// LHS < RHS, return -1. 2580int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2581 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2582 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2583 if (LHSC == RHSC) return 0; 2584 2585 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2586 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2587 2588 unsigned LHSRank = getIntegerRank(LHSC); 2589 unsigned RHSRank = getIntegerRank(RHSC); 2590 2591 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2592 if (LHSRank == RHSRank) return 0; 2593 return LHSRank > RHSRank ? 1 : -1; 2594 } 2595 2596 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2597 if (LHSUnsigned) { 2598 // If the unsigned [LHS] type is larger, return it. 2599 if (LHSRank >= RHSRank) 2600 return 1; 2601 2602 // If the signed type can represent all values of the unsigned type, it 2603 // wins. Because we are dealing with 2's complement and types that are 2604 // powers of two larger than each other, this is always safe. 2605 return -1; 2606 } 2607 2608 // If the unsigned [RHS] type is larger, return it. 2609 if (RHSRank >= LHSRank) 2610 return -1; 2611 2612 // If the signed type can represent all values of the unsigned type, it 2613 // wins. Because we are dealing with 2's complement and types that are 2614 // powers of two larger than each other, this is always safe. 2615 return 1; 2616} 2617 2618// getCFConstantStringType - Return the type used for constant CFStrings. 2619QualType ASTContext::getCFConstantStringType() { 2620 if (!CFConstantStringTypeDecl) { 2621 CFConstantStringTypeDecl = 2622 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2623 &Idents.get("NSConstantString")); 2624 QualType FieldTypes[4]; 2625 2626 // const int *isa; 2627 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 2628 // int flags; 2629 FieldTypes[1] = IntTy; 2630 // const char *str; 2631 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 2632 // long length; 2633 FieldTypes[3] = LongTy; 2634 2635 // Create fields 2636 for (unsigned i = 0; i < 4; ++i) { 2637 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2638 SourceLocation(), 0, 2639 FieldTypes[i], /*DInfo=*/0, 2640 /*BitWidth=*/0, 2641 /*Mutable=*/false); 2642 CFConstantStringTypeDecl->addDecl(Field); 2643 } 2644 2645 CFConstantStringTypeDecl->completeDefinition(*this); 2646 } 2647 2648 return getTagDeclType(CFConstantStringTypeDecl); 2649} 2650 2651void ASTContext::setCFConstantStringType(QualType T) { 2652 const RecordType *Rec = T->getAs<RecordType>(); 2653 assert(Rec && "Invalid CFConstantStringType"); 2654 CFConstantStringTypeDecl = Rec->getDecl(); 2655} 2656 2657QualType ASTContext::getObjCFastEnumerationStateType() 2658{ 2659 if (!ObjCFastEnumerationStateTypeDecl) { 2660 ObjCFastEnumerationStateTypeDecl = 2661 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2662 &Idents.get("__objcFastEnumerationState")); 2663 2664 QualType FieldTypes[] = { 2665 UnsignedLongTy, 2666 getPointerType(ObjCIdTypedefType), 2667 getPointerType(UnsignedLongTy), 2668 getConstantArrayType(UnsignedLongTy, 2669 llvm::APInt(32, 5), ArrayType::Normal, 0) 2670 }; 2671 2672 for (size_t i = 0; i < 4; ++i) { 2673 FieldDecl *Field = FieldDecl::Create(*this, 2674 ObjCFastEnumerationStateTypeDecl, 2675 SourceLocation(), 0, 2676 FieldTypes[i], /*DInfo=*/0, 2677 /*BitWidth=*/0, 2678 /*Mutable=*/false); 2679 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2680 } 2681 2682 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2683 } 2684 2685 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2686} 2687 2688void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2689 const RecordType *Rec = T->getAs<RecordType>(); 2690 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2691 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2692} 2693 2694// This returns true if a type has been typedefed to BOOL: 2695// typedef <type> BOOL; 2696static bool isTypeTypedefedAsBOOL(QualType T) { 2697 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2698 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2699 return II->isStr("BOOL"); 2700 2701 return false; 2702} 2703 2704/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2705/// purpose. 2706int ASTContext::getObjCEncodingTypeSize(QualType type) { 2707 uint64_t sz = getTypeSize(type); 2708 2709 // Make all integer and enum types at least as large as an int 2710 if (sz > 0 && type->isIntegralType()) 2711 sz = std::max(sz, getTypeSize(IntTy)); 2712 // Treat arrays as pointers, since that's how they're passed in. 2713 else if (type->isArrayType()) 2714 sz = getTypeSize(VoidPtrTy); 2715 return sz / getTypeSize(CharTy); 2716} 2717 2718/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2719/// declaration. 2720void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2721 std::string& S) { 2722 // FIXME: This is not very efficient. 2723 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2724 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2725 // Encode result type. 2726 getObjCEncodingForType(Decl->getResultType(), S); 2727 // Compute size of all parameters. 2728 // Start with computing size of a pointer in number of bytes. 2729 // FIXME: There might(should) be a better way of doing this computation! 2730 SourceLocation Loc; 2731 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2732 // The first two arguments (self and _cmd) are pointers; account for 2733 // their size. 2734 int ParmOffset = 2 * PtrSize; 2735 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2736 E = Decl->param_end(); PI != E; ++PI) { 2737 QualType PType = (*PI)->getType(); 2738 int sz = getObjCEncodingTypeSize(PType); 2739 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2740 ParmOffset += sz; 2741 } 2742 S += llvm::utostr(ParmOffset); 2743 S += "@0:"; 2744 S += llvm::utostr(PtrSize); 2745 2746 // Argument types. 2747 ParmOffset = 2 * PtrSize; 2748 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2749 E = Decl->param_end(); PI != E; ++PI) { 2750 ParmVarDecl *PVDecl = *PI; 2751 QualType PType = PVDecl->getOriginalType(); 2752 if (const ArrayType *AT = 2753 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2754 // Use array's original type only if it has known number of 2755 // elements. 2756 if (!isa<ConstantArrayType>(AT)) 2757 PType = PVDecl->getType(); 2758 } else if (PType->isFunctionType()) 2759 PType = PVDecl->getType(); 2760 // Process argument qualifiers for user supplied arguments; such as, 2761 // 'in', 'inout', etc. 2762 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2763 getObjCEncodingForType(PType, S); 2764 S += llvm::utostr(ParmOffset); 2765 ParmOffset += getObjCEncodingTypeSize(PType); 2766 } 2767} 2768 2769/// getObjCEncodingForPropertyDecl - Return the encoded type for this 2770/// property declaration. If non-NULL, Container must be either an 2771/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 2772/// NULL when getting encodings for protocol properties. 2773/// Property attributes are stored as a comma-delimited C string. The simple 2774/// attributes readonly and bycopy are encoded as single characters. The 2775/// parametrized attributes, getter=name, setter=name, and ivar=name, are 2776/// encoded as single characters, followed by an identifier. Property types 2777/// are also encoded as a parametrized attribute. The characters used to encode 2778/// these attributes are defined by the following enumeration: 2779/// @code 2780/// enum PropertyAttributes { 2781/// kPropertyReadOnly = 'R', // property is read-only. 2782/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 2783/// kPropertyByref = '&', // property is a reference to the value last assigned 2784/// kPropertyDynamic = 'D', // property is dynamic 2785/// kPropertyGetter = 'G', // followed by getter selector name 2786/// kPropertySetter = 'S', // followed by setter selector name 2787/// kPropertyInstanceVariable = 'V' // followed by instance variable name 2788/// kPropertyType = 't' // followed by old-style type encoding. 2789/// kPropertyWeak = 'W' // 'weak' property 2790/// kPropertyStrong = 'P' // property GC'able 2791/// kPropertyNonAtomic = 'N' // property non-atomic 2792/// }; 2793/// @endcode 2794void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 2795 const Decl *Container, 2796 std::string& S) { 2797 // Collect information from the property implementation decl(s). 2798 bool Dynamic = false; 2799 ObjCPropertyImplDecl *SynthesizePID = 0; 2800 2801 // FIXME: Duplicated code due to poor abstraction. 2802 if (Container) { 2803 if (const ObjCCategoryImplDecl *CID = 2804 dyn_cast<ObjCCategoryImplDecl>(Container)) { 2805 for (ObjCCategoryImplDecl::propimpl_iterator 2806 i = CID->propimpl_begin(), e = CID->propimpl_end(); 2807 i != e; ++i) { 2808 ObjCPropertyImplDecl *PID = *i; 2809 if (PID->getPropertyDecl() == PD) { 2810 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2811 Dynamic = true; 2812 } else { 2813 SynthesizePID = PID; 2814 } 2815 } 2816 } 2817 } else { 2818 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 2819 for (ObjCCategoryImplDecl::propimpl_iterator 2820 i = OID->propimpl_begin(), e = OID->propimpl_end(); 2821 i != e; ++i) { 2822 ObjCPropertyImplDecl *PID = *i; 2823 if (PID->getPropertyDecl() == PD) { 2824 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 2825 Dynamic = true; 2826 } else { 2827 SynthesizePID = PID; 2828 } 2829 } 2830 } 2831 } 2832 } 2833 2834 // FIXME: This is not very efficient. 2835 S = "T"; 2836 2837 // Encode result type. 2838 // GCC has some special rules regarding encoding of properties which 2839 // closely resembles encoding of ivars. 2840 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 2841 true /* outermost type */, 2842 true /* encoding for property */); 2843 2844 if (PD->isReadOnly()) { 2845 S += ",R"; 2846 } else { 2847 switch (PD->getSetterKind()) { 2848 case ObjCPropertyDecl::Assign: break; 2849 case ObjCPropertyDecl::Copy: S += ",C"; break; 2850 case ObjCPropertyDecl::Retain: S += ",&"; break; 2851 } 2852 } 2853 2854 // It really isn't clear at all what this means, since properties 2855 // are "dynamic by default". 2856 if (Dynamic) 2857 S += ",D"; 2858 2859 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 2860 S += ",N"; 2861 2862 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 2863 S += ",G"; 2864 S += PD->getGetterName().getAsString(); 2865 } 2866 2867 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 2868 S += ",S"; 2869 S += PD->getSetterName().getAsString(); 2870 } 2871 2872 if (SynthesizePID) { 2873 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 2874 S += ",V"; 2875 S += OID->getNameAsString(); 2876 } 2877 2878 // FIXME: OBJCGC: weak & strong 2879} 2880 2881/// getLegacyIntegralTypeEncoding - 2882/// Another legacy compatibility encoding: 32-bit longs are encoded as 2883/// 'l' or 'L' , but not always. For typedefs, we need to use 2884/// 'i' or 'I' instead if encoding a struct field, or a pointer! 2885/// 2886void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 2887 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 2888 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 2889 if (BT->getKind() == BuiltinType::ULong && 2890 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2891 PointeeTy = UnsignedIntTy; 2892 else 2893 if (BT->getKind() == BuiltinType::Long && 2894 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 2895 PointeeTy = IntTy; 2896 } 2897 } 2898} 2899 2900void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 2901 const FieldDecl *Field) { 2902 // We follow the behavior of gcc, expanding structures which are 2903 // directly pointed to, and expanding embedded structures. Note that 2904 // these rules are sufficient to prevent recursive encoding of the 2905 // same type. 2906 getObjCEncodingForTypeImpl(T, S, true, true, Field, 2907 true /* outermost type */); 2908} 2909 2910static void EncodeBitField(const ASTContext *Context, std::string& S, 2911 const FieldDecl *FD) { 2912 const Expr *E = FD->getBitWidth(); 2913 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 2914 ASTContext *Ctx = const_cast<ASTContext*>(Context); 2915 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 2916 S += 'b'; 2917 S += llvm::utostr(N); 2918} 2919 2920void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 2921 bool ExpandPointedToStructures, 2922 bool ExpandStructures, 2923 const FieldDecl *FD, 2924 bool OutermostType, 2925 bool EncodingProperty) { 2926 if (const BuiltinType *BT = T->getAsBuiltinType()) { 2927 if (FD && FD->isBitField()) 2928 return EncodeBitField(this, S, FD); 2929 char encoding; 2930 switch (BT->getKind()) { 2931 default: assert(0 && "Unhandled builtin type kind"); 2932 case BuiltinType::Void: encoding = 'v'; break; 2933 case BuiltinType::Bool: encoding = 'B'; break; 2934 case BuiltinType::Char_U: 2935 case BuiltinType::UChar: encoding = 'C'; break; 2936 case BuiltinType::UShort: encoding = 'S'; break; 2937 case BuiltinType::UInt: encoding = 'I'; break; 2938 case BuiltinType::ULong: 2939 encoding = 2940 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 2941 break; 2942 case BuiltinType::UInt128: encoding = 'T'; break; 2943 case BuiltinType::ULongLong: encoding = 'Q'; break; 2944 case BuiltinType::Char_S: 2945 case BuiltinType::SChar: encoding = 'c'; break; 2946 case BuiltinType::Short: encoding = 's'; break; 2947 case BuiltinType::Int: encoding = 'i'; break; 2948 case BuiltinType::Long: 2949 encoding = 2950 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 2951 break; 2952 case BuiltinType::LongLong: encoding = 'q'; break; 2953 case BuiltinType::Int128: encoding = 't'; break; 2954 case BuiltinType::Float: encoding = 'f'; break; 2955 case BuiltinType::Double: encoding = 'd'; break; 2956 case BuiltinType::LongDouble: encoding = 'd'; break; 2957 } 2958 2959 S += encoding; 2960 return; 2961 } 2962 2963 if (const ComplexType *CT = T->getAsComplexType()) { 2964 S += 'j'; 2965 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 2966 false); 2967 return; 2968 } 2969 2970 if (const PointerType *PT = T->getAs<PointerType>()) { 2971 QualType PointeeTy = PT->getPointeeType(); 2972 bool isReadOnly = false; 2973 // For historical/compatibility reasons, the read-only qualifier of the 2974 // pointee gets emitted _before_ the '^'. The read-only qualifier of 2975 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 2976 // Also, do not emit the 'r' for anything but the outermost type! 2977 if (isa<TypedefType>(T.getTypePtr())) { 2978 if (OutermostType && T.isConstQualified()) { 2979 isReadOnly = true; 2980 S += 'r'; 2981 } 2982 } else if (OutermostType) { 2983 QualType P = PointeeTy; 2984 while (P->getAs<PointerType>()) 2985 P = P->getAs<PointerType>()->getPointeeType(); 2986 if (P.isConstQualified()) { 2987 isReadOnly = true; 2988 S += 'r'; 2989 } 2990 } 2991 if (isReadOnly) { 2992 // Another legacy compatibility encoding. Some ObjC qualifier and type 2993 // combinations need to be rearranged. 2994 // Rewrite "in const" from "nr" to "rn" 2995 const char * s = S.c_str(); 2996 int len = S.length(); 2997 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 2998 std::string replace = "rn"; 2999 S.replace(S.end()-2, S.end(), replace); 3000 } 3001 } 3002 if (isObjCSelType(PointeeTy)) { 3003 S += ':'; 3004 return; 3005 } 3006 3007 if (PointeeTy->isCharType()) { 3008 // char pointer types should be encoded as '*' unless it is a 3009 // type that has been typedef'd to 'BOOL'. 3010 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3011 S += '*'; 3012 return; 3013 } 3014 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3015 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3016 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3017 S += '#'; 3018 return; 3019 } 3020 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3021 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3022 S += '@'; 3023 return; 3024 } 3025 // fall through... 3026 } 3027 S += '^'; 3028 getLegacyIntegralTypeEncoding(PointeeTy); 3029 3030 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3031 NULL); 3032 return; 3033 } 3034 3035 if (const ArrayType *AT = 3036 // Ignore type qualifiers etc. 3037 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3038 if (isa<IncompleteArrayType>(AT)) { 3039 // Incomplete arrays are encoded as a pointer to the array element. 3040 S += '^'; 3041 3042 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3043 false, ExpandStructures, FD); 3044 } else { 3045 S += '['; 3046 3047 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3048 S += llvm::utostr(CAT->getSize().getZExtValue()); 3049 else { 3050 //Variable length arrays are encoded as a regular array with 0 elements. 3051 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3052 S += '0'; 3053 } 3054 3055 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3056 false, ExpandStructures, FD); 3057 S += ']'; 3058 } 3059 return; 3060 } 3061 3062 if (T->getAsFunctionType()) { 3063 S += '?'; 3064 return; 3065 } 3066 3067 if (const RecordType *RTy = T->getAs<RecordType>()) { 3068 RecordDecl *RDecl = RTy->getDecl(); 3069 S += RDecl->isUnion() ? '(' : '{'; 3070 // Anonymous structures print as '?' 3071 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3072 S += II->getName(); 3073 } else { 3074 S += '?'; 3075 } 3076 if (ExpandStructures) { 3077 S += '='; 3078 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3079 FieldEnd = RDecl->field_end(); 3080 Field != FieldEnd; ++Field) { 3081 if (FD) { 3082 S += '"'; 3083 S += Field->getNameAsString(); 3084 S += '"'; 3085 } 3086 3087 // Special case bit-fields. 3088 if (Field->isBitField()) { 3089 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3090 (*Field)); 3091 } else { 3092 QualType qt = Field->getType(); 3093 getLegacyIntegralTypeEncoding(qt); 3094 getObjCEncodingForTypeImpl(qt, S, false, true, 3095 FD); 3096 } 3097 } 3098 } 3099 S += RDecl->isUnion() ? ')' : '}'; 3100 return; 3101 } 3102 3103 if (T->isEnumeralType()) { 3104 if (FD && FD->isBitField()) 3105 EncodeBitField(this, S, FD); 3106 else 3107 S += 'i'; 3108 return; 3109 } 3110 3111 if (T->isBlockPointerType()) { 3112 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3113 return; 3114 } 3115 3116 if (T->isObjCInterfaceType()) { 3117 // @encode(class_name) 3118 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 3119 S += '{'; 3120 const IdentifierInfo *II = OI->getIdentifier(); 3121 S += II->getName(); 3122 S += '='; 3123 llvm::SmallVector<FieldDecl*, 32> RecFields; 3124 CollectObjCIvars(OI, RecFields); 3125 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3126 if (RecFields[i]->isBitField()) 3127 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3128 RecFields[i]); 3129 else 3130 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3131 FD); 3132 } 3133 S += '}'; 3134 return; 3135 } 3136 3137 if (const ObjCObjectPointerType *OPT = T->getAsObjCObjectPointerType()) { 3138 if (OPT->isObjCIdType()) { 3139 S += '@'; 3140 return; 3141 } 3142 3143 if (OPT->isObjCClassType()) { 3144 S += '#'; 3145 return; 3146 } 3147 3148 if (OPT->isObjCQualifiedIdType()) { 3149 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3150 ExpandPointedToStructures, 3151 ExpandStructures, FD); 3152 if (FD || EncodingProperty) { 3153 // Note that we do extended encoding of protocol qualifer list 3154 // Only when doing ivar or property encoding. 3155 S += '"'; 3156 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3157 E = OPT->qual_end(); I != E; ++I) { 3158 S += '<'; 3159 S += (*I)->getNameAsString(); 3160 S += '>'; 3161 } 3162 S += '"'; 3163 } 3164 return; 3165 } 3166 3167 QualType PointeeTy = OPT->getPointeeType(); 3168 if (!EncodingProperty && 3169 isa<TypedefType>(PointeeTy.getTypePtr())) { 3170 // Another historical/compatibility reason. 3171 // We encode the underlying type which comes out as 3172 // {...}; 3173 S += '^'; 3174 getObjCEncodingForTypeImpl(PointeeTy, S, 3175 false, ExpandPointedToStructures, 3176 NULL); 3177 return; 3178 } 3179 3180 S += '@'; 3181 if (FD || EncodingProperty) { 3182 S += '"'; 3183 S += OPT->getInterfaceDecl()->getNameAsCString(); 3184 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3185 E = OPT->qual_end(); I != E; ++I) { 3186 S += '<'; 3187 S += (*I)->getNameAsString(); 3188 S += '>'; 3189 } 3190 S += '"'; 3191 } 3192 return; 3193 } 3194 3195 assert(0 && "@encode for type not implemented!"); 3196} 3197 3198void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3199 std::string& S) const { 3200 if (QT & Decl::OBJC_TQ_In) 3201 S += 'n'; 3202 if (QT & Decl::OBJC_TQ_Inout) 3203 S += 'N'; 3204 if (QT & Decl::OBJC_TQ_Out) 3205 S += 'o'; 3206 if (QT & Decl::OBJC_TQ_Bycopy) 3207 S += 'O'; 3208 if (QT & Decl::OBJC_TQ_Byref) 3209 S += 'R'; 3210 if (QT & Decl::OBJC_TQ_Oneway) 3211 S += 'V'; 3212} 3213 3214void ASTContext::setBuiltinVaListType(QualType T) { 3215 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3216 3217 BuiltinVaListType = T; 3218} 3219 3220void ASTContext::setObjCIdType(QualType T) { 3221 ObjCIdTypedefType = T; 3222} 3223 3224void ASTContext::setObjCSelType(QualType T) { 3225 ObjCSelType = T; 3226 3227 const TypedefType *TT = T->getAsTypedefType(); 3228 if (!TT) 3229 return; 3230 TypedefDecl *TD = TT->getDecl(); 3231 3232 // typedef struct objc_selector *SEL; 3233 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3234 if (!ptr) 3235 return; 3236 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3237 if (!rec) 3238 return; 3239 SelStructType = rec; 3240} 3241 3242void ASTContext::setObjCProtoType(QualType QT) { 3243 ObjCProtoType = QT; 3244} 3245 3246void ASTContext::setObjCClassType(QualType T) { 3247 ObjCClassTypedefType = T; 3248} 3249 3250void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3251 assert(ObjCConstantStringType.isNull() && 3252 "'NSConstantString' type already set!"); 3253 3254 ObjCConstantStringType = getObjCInterfaceType(Decl); 3255} 3256 3257/// \brief Retrieve the template name that represents a qualified 3258/// template name such as \c std::vector. 3259TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3260 bool TemplateKeyword, 3261 TemplateDecl *Template) { 3262 llvm::FoldingSetNodeID ID; 3263 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3264 3265 void *InsertPos = 0; 3266 QualifiedTemplateName *QTN = 3267 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3268 if (!QTN) { 3269 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3270 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3271 } 3272 3273 return TemplateName(QTN); 3274} 3275 3276/// \brief Retrieve the template name that represents a qualified 3277/// template name such as \c std::vector. 3278TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3279 bool TemplateKeyword, 3280 OverloadedFunctionDecl *Template) { 3281 llvm::FoldingSetNodeID ID; 3282 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3283 3284 void *InsertPos = 0; 3285 QualifiedTemplateName *QTN = 3286 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3287 if (!QTN) { 3288 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3289 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3290 } 3291 3292 return TemplateName(QTN); 3293} 3294 3295/// \brief Retrieve the template name that represents a dependent 3296/// template name such as \c MetaFun::template apply. 3297TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3298 const IdentifierInfo *Name) { 3299 assert(NNS->isDependent() && "Nested name specifier must be dependent"); 3300 3301 llvm::FoldingSetNodeID ID; 3302 DependentTemplateName::Profile(ID, NNS, Name); 3303 3304 void *InsertPos = 0; 3305 DependentTemplateName *QTN = 3306 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3307 3308 if (QTN) 3309 return TemplateName(QTN); 3310 3311 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3312 if (CanonNNS == NNS) { 3313 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3314 } else { 3315 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3316 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3317 } 3318 3319 DependentTemplateNames.InsertNode(QTN, InsertPos); 3320 return TemplateName(QTN); 3321} 3322 3323/// getFromTargetType - Given one of the integer types provided by 3324/// TargetInfo, produce the corresponding type. The unsigned @p Type 3325/// is actually a value of type @c TargetInfo::IntType. 3326QualType ASTContext::getFromTargetType(unsigned Type) const { 3327 switch (Type) { 3328 case TargetInfo::NoInt: return QualType(); 3329 case TargetInfo::SignedShort: return ShortTy; 3330 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3331 case TargetInfo::SignedInt: return IntTy; 3332 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3333 case TargetInfo::SignedLong: return LongTy; 3334 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3335 case TargetInfo::SignedLongLong: return LongLongTy; 3336 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3337 } 3338 3339 assert(false && "Unhandled TargetInfo::IntType value"); 3340 return QualType(); 3341} 3342 3343//===----------------------------------------------------------------------===// 3344// Type Predicates. 3345//===----------------------------------------------------------------------===// 3346 3347/// isObjCNSObjectType - Return true if this is an NSObject object using 3348/// NSObject attribute on a c-style pointer type. 3349/// FIXME - Make it work directly on types. 3350/// FIXME: Move to Type. 3351/// 3352bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3353 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3354 if (TypedefDecl *TD = TDT->getDecl()) 3355 if (TD->getAttr<ObjCNSObjectAttr>()) 3356 return true; 3357 } 3358 return false; 3359} 3360 3361/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3362/// garbage collection attribute. 3363/// 3364QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3365 QualType::GCAttrTypes GCAttrs = QualType::GCNone; 3366 if (getLangOptions().ObjC1 && 3367 getLangOptions().getGCMode() != LangOptions::NonGC) { 3368 GCAttrs = Ty.getObjCGCAttr(); 3369 // Default behavious under objective-c's gc is for objective-c pointers 3370 // (or pointers to them) be treated as though they were declared 3371 // as __strong. 3372 if (GCAttrs == QualType::GCNone) { 3373 if (Ty->isObjCObjectPointerType()) 3374 GCAttrs = QualType::Strong; 3375 else if (Ty->isPointerType()) 3376 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3377 } 3378 // Non-pointers have none gc'able attribute regardless of the attribute 3379 // set on them. 3380 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3381 return QualType::GCNone; 3382 } 3383 return GCAttrs; 3384} 3385 3386//===----------------------------------------------------------------------===// 3387// Type Compatibility Testing 3388//===----------------------------------------------------------------------===// 3389 3390/// areCompatVectorTypes - Return true if the two specified vector types are 3391/// compatible. 3392static bool areCompatVectorTypes(const VectorType *LHS, 3393 const VectorType *RHS) { 3394 assert(LHS->isCanonical() && RHS->isCanonical()); 3395 return LHS->getElementType() == RHS->getElementType() && 3396 LHS->getNumElements() == RHS->getNumElements(); 3397} 3398 3399//===----------------------------------------------------------------------===// 3400// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3401//===----------------------------------------------------------------------===// 3402 3403/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3404/// inheritance hierarchy of 'rProto'. 3405bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3406 ObjCProtocolDecl *rProto) { 3407 if (lProto == rProto) 3408 return true; 3409 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3410 E = rProto->protocol_end(); PI != E; ++PI) 3411 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3412 return true; 3413 return false; 3414} 3415 3416/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3417/// return true if lhs's protocols conform to rhs's protocol; false 3418/// otherwise. 3419bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3420 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3421 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3422 return false; 3423} 3424 3425/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3426/// ObjCQualifiedIDType. 3427bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3428 bool compare) { 3429 // Allow id<P..> and an 'id' or void* type in all cases. 3430 if (lhs->isVoidPointerType() || 3431 lhs->isObjCIdType() || lhs->isObjCClassType()) 3432 return true; 3433 else if (rhs->isVoidPointerType() || 3434 rhs->isObjCIdType() || rhs->isObjCClassType()) 3435 return true; 3436 3437 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3438 const ObjCObjectPointerType *rhsOPT = rhs->getAsObjCObjectPointerType(); 3439 3440 if (!rhsOPT) return false; 3441 3442 if (rhsOPT->qual_empty()) { 3443 // If the RHS is a unqualified interface pointer "NSString*", 3444 // make sure we check the class hierarchy. 3445 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3446 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3447 E = lhsQID->qual_end(); I != E; ++I) { 3448 // when comparing an id<P> on lhs with a static type on rhs, 3449 // see if static class implements all of id's protocols, directly or 3450 // through its super class and categories. 3451 if (!rhsID->ClassImplementsProtocol(*I, true)) 3452 return false; 3453 } 3454 } 3455 // If there are no qualifiers and no interface, we have an 'id'. 3456 return true; 3457 } 3458 // Both the right and left sides have qualifiers. 3459 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3460 E = lhsQID->qual_end(); I != E; ++I) { 3461 ObjCProtocolDecl *lhsProto = *I; 3462 bool match = false; 3463 3464 // when comparing an id<P> on lhs with a static type on rhs, 3465 // see if static class implements all of id's protocols, directly or 3466 // through its super class and categories. 3467 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3468 E = rhsOPT->qual_end(); J != E; ++J) { 3469 ObjCProtocolDecl *rhsProto = *J; 3470 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3471 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3472 match = true; 3473 break; 3474 } 3475 } 3476 // If the RHS is a qualified interface pointer "NSString<P>*", 3477 // make sure we check the class hierarchy. 3478 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3479 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3480 E = lhsQID->qual_end(); I != E; ++I) { 3481 // when comparing an id<P> on lhs with a static type on rhs, 3482 // see if static class implements all of id's protocols, directly or 3483 // through its super class and categories. 3484 if (rhsID->ClassImplementsProtocol(*I, true)) { 3485 match = true; 3486 break; 3487 } 3488 } 3489 } 3490 if (!match) 3491 return false; 3492 } 3493 3494 return true; 3495 } 3496 3497 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3498 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3499 3500 if (const ObjCObjectPointerType *lhsOPT = 3501 lhs->getAsObjCInterfacePointerType()) { 3502 if (lhsOPT->qual_empty()) { 3503 bool match = false; 3504 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3505 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3506 E = rhsQID->qual_end(); I != E; ++I) { 3507 // when comparing an id<P> on lhs with a static type on rhs, 3508 // see if static class implements all of id's protocols, directly or 3509 // through its super class and categories. 3510 if (lhsID->ClassImplementsProtocol(*I, true)) { 3511 match = true; 3512 break; 3513 } 3514 } 3515 if (!match) 3516 return false; 3517 } 3518 return true; 3519 } 3520 // Both the right and left sides have qualifiers. 3521 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3522 E = lhsOPT->qual_end(); I != E; ++I) { 3523 ObjCProtocolDecl *lhsProto = *I; 3524 bool match = false; 3525 3526 // when comparing an id<P> on lhs with a static type on rhs, 3527 // see if static class implements all of id's protocols, directly or 3528 // through its super class and categories. 3529 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3530 E = rhsQID->qual_end(); J != E; ++J) { 3531 ObjCProtocolDecl *rhsProto = *J; 3532 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3533 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3534 match = true; 3535 break; 3536 } 3537 } 3538 if (!match) 3539 return false; 3540 } 3541 return true; 3542 } 3543 return false; 3544} 3545 3546/// canAssignObjCInterfaces - Return true if the two interface types are 3547/// compatible for assignment from RHS to LHS. This handles validation of any 3548/// protocol qualifiers on the LHS or RHS. 3549/// 3550bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3551 const ObjCObjectPointerType *RHSOPT) { 3552 // If either type represents the built-in 'id' or 'Class' types, return true. 3553 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3554 return true; 3555 3556 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3557 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3558 QualType(RHSOPT,0), 3559 false); 3560 3561 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3562 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3563 if (LHS && RHS) // We have 2 user-defined types. 3564 return canAssignObjCInterfaces(LHS, RHS); 3565 3566 return false; 3567} 3568 3569bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3570 const ObjCInterfaceType *RHS) { 3571 // Verify that the base decls are compatible: the RHS must be a subclass of 3572 // the LHS. 3573 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3574 return false; 3575 3576 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3577 // protocol qualified at all, then we are good. 3578 if (LHS->getNumProtocols() == 0) 3579 return true; 3580 3581 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3582 // isn't a superset. 3583 if (RHS->getNumProtocols() == 0) 3584 return true; // FIXME: should return false! 3585 3586 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3587 LHSPE = LHS->qual_end(); 3588 LHSPI != LHSPE; LHSPI++) { 3589 bool RHSImplementsProtocol = false; 3590 3591 // If the RHS doesn't implement the protocol on the left, the types 3592 // are incompatible. 3593 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3594 RHSPE = RHS->qual_end(); 3595 RHSPI != RHSPE; RHSPI++) { 3596 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3597 RHSImplementsProtocol = true; 3598 break; 3599 } 3600 } 3601 // FIXME: For better diagnostics, consider passing back the protocol name. 3602 if (!RHSImplementsProtocol) 3603 return false; 3604 } 3605 // The RHS implements all protocols listed on the LHS. 3606 return true; 3607} 3608 3609bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3610 // get the "pointed to" types 3611 const ObjCObjectPointerType *LHSOPT = LHS->getAsObjCObjectPointerType(); 3612 const ObjCObjectPointerType *RHSOPT = RHS->getAsObjCObjectPointerType(); 3613 3614 if (!LHSOPT || !RHSOPT) 3615 return false; 3616 3617 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3618 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3619} 3620 3621/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3622/// both shall have the identically qualified version of a compatible type. 3623/// C99 6.2.7p1: Two types have compatible types if their types are the 3624/// same. See 6.7.[2,3,5] for additional rules. 3625bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3626 return !mergeTypes(LHS, RHS).isNull(); 3627} 3628 3629QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3630 const FunctionType *lbase = lhs->getAsFunctionType(); 3631 const FunctionType *rbase = rhs->getAsFunctionType(); 3632 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3633 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3634 bool allLTypes = true; 3635 bool allRTypes = true; 3636 3637 // Check return type 3638 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3639 if (retType.isNull()) return QualType(); 3640 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3641 allLTypes = false; 3642 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3643 allRTypes = false; 3644 // FIXME: double check this 3645 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 3646 if (NoReturn != lbase->getNoReturnAttr()) 3647 allLTypes = false; 3648 if (NoReturn != rbase->getNoReturnAttr()) 3649 allRTypes = false; 3650 3651 if (lproto && rproto) { // two C99 style function prototypes 3652 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3653 "C++ shouldn't be here"); 3654 unsigned lproto_nargs = lproto->getNumArgs(); 3655 unsigned rproto_nargs = rproto->getNumArgs(); 3656 3657 // Compatible functions must have the same number of arguments 3658 if (lproto_nargs != rproto_nargs) 3659 return QualType(); 3660 3661 // Variadic and non-variadic functions aren't compatible 3662 if (lproto->isVariadic() != rproto->isVariadic()) 3663 return QualType(); 3664 3665 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3666 return QualType(); 3667 3668 // Check argument compatibility 3669 llvm::SmallVector<QualType, 10> types; 3670 for (unsigned i = 0; i < lproto_nargs; i++) { 3671 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3672 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3673 QualType argtype = mergeTypes(largtype, rargtype); 3674 if (argtype.isNull()) return QualType(); 3675 types.push_back(argtype); 3676 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3677 allLTypes = false; 3678 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3679 allRTypes = false; 3680 } 3681 if (allLTypes) return lhs; 3682 if (allRTypes) return rhs; 3683 return getFunctionType(retType, types.begin(), types.size(), 3684 lproto->isVariadic(), lproto->getTypeQuals(), 3685 NoReturn); 3686 } 3687 3688 if (lproto) allRTypes = false; 3689 if (rproto) allLTypes = false; 3690 3691 const FunctionProtoType *proto = lproto ? lproto : rproto; 3692 if (proto) { 3693 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3694 if (proto->isVariadic()) return QualType(); 3695 // Check that the types are compatible with the types that 3696 // would result from default argument promotions (C99 6.7.5.3p15). 3697 // The only types actually affected are promotable integer 3698 // types and floats, which would be passed as a different 3699 // type depending on whether the prototype is visible. 3700 unsigned proto_nargs = proto->getNumArgs(); 3701 for (unsigned i = 0; i < proto_nargs; ++i) { 3702 QualType argTy = proto->getArgType(i); 3703 if (argTy->isPromotableIntegerType() || 3704 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3705 return QualType(); 3706 } 3707 3708 if (allLTypes) return lhs; 3709 if (allRTypes) return rhs; 3710 return getFunctionType(retType, proto->arg_type_begin(), 3711 proto->getNumArgs(), proto->isVariadic(), 3712 proto->getTypeQuals(), NoReturn); 3713 } 3714 3715 if (allLTypes) return lhs; 3716 if (allRTypes) return rhs; 3717 return getFunctionNoProtoType(retType, NoReturn); 3718} 3719 3720QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3721 // C++ [expr]: If an expression initially has the type "reference to T", the 3722 // type is adjusted to "T" prior to any further analysis, the expression 3723 // designates the object or function denoted by the reference, and the 3724 // expression is an lvalue unless the reference is an rvalue reference and 3725 // the expression is a function call (possibly inside parentheses). 3726 // FIXME: C++ shouldn't be going through here! The rules are different 3727 // enough that they should be handled separately. 3728 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3729 // shouldn't be going through here! 3730 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 3731 LHS = RT->getPointeeType(); 3732 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 3733 RHS = RT->getPointeeType(); 3734 3735 QualType LHSCan = getCanonicalType(LHS), 3736 RHSCan = getCanonicalType(RHS); 3737 3738 // If two types are identical, they are compatible. 3739 if (LHSCan == RHSCan) 3740 return LHS; 3741 3742 // If the qualifiers are different, the types aren't compatible 3743 // Note that we handle extended qualifiers later, in the 3744 // case for ExtQualType. 3745 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers()) 3746 return QualType(); 3747 3748 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 3749 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 3750 3751 // We want to consider the two function types to be the same for these 3752 // comparisons, just force one to the other. 3753 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 3754 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 3755 3756 // Strip off objc_gc attributes off the top level so they can be merged. 3757 // This is a complete mess, but the attribute itself doesn't make much sense. 3758 if (RHSClass == Type::ExtQual) { 3759 QualType::GCAttrTypes GCAttr = RHSCan.getObjCGCAttr(); 3760 if (GCAttr != QualType::GCNone) { 3761 QualType::GCAttrTypes GCLHSAttr = LHSCan.getObjCGCAttr(); 3762 // __weak attribute must appear on both declarations. 3763 // __strong attribue is redundant if other decl is an objective-c 3764 // object pointer (or decorated with __strong attribute); otherwise 3765 // issue error. 3766 if ((GCAttr == QualType::Weak && GCLHSAttr != GCAttr) || 3767 (GCAttr == QualType::Strong && GCLHSAttr != GCAttr && 3768 !LHSCan->isObjCObjectPointerType())) 3769 return QualType(); 3770 3771 RHS = QualType(cast<ExtQualType>(RHS.getDesugaredType())->getBaseType(), 3772 RHS.getCVRQualifiers()); 3773 QualType Result = mergeTypes(LHS, RHS); 3774 if (!Result.isNull()) { 3775 if (Result.getObjCGCAttr() == QualType::GCNone) 3776 Result = getObjCGCQualType(Result, GCAttr); 3777 else if (Result.getObjCGCAttr() != GCAttr) 3778 Result = QualType(); 3779 } 3780 return Result; 3781 } 3782 } 3783 if (LHSClass == Type::ExtQual) { 3784 QualType::GCAttrTypes GCAttr = LHSCan.getObjCGCAttr(); 3785 if (GCAttr != QualType::GCNone) { 3786 QualType::GCAttrTypes GCRHSAttr = RHSCan.getObjCGCAttr(); 3787 // __weak attribute must appear on both declarations. __strong 3788 // __strong attribue is redundant if other decl is an objective-c 3789 // object pointer (or decorated with __strong attribute); otherwise 3790 // issue error. 3791 if ((GCAttr == QualType::Weak && GCRHSAttr != GCAttr) || 3792 (GCAttr == QualType::Strong && GCRHSAttr != GCAttr && 3793 !RHSCan->isObjCObjectPointerType())) 3794 return QualType(); 3795 3796 LHS = QualType(cast<ExtQualType>(LHS.getDesugaredType())->getBaseType(), 3797 LHS.getCVRQualifiers()); 3798 QualType Result = mergeTypes(LHS, RHS); 3799 if (!Result.isNull()) { 3800 if (Result.getObjCGCAttr() == QualType::GCNone) 3801 Result = getObjCGCQualType(Result, GCAttr); 3802 else if (Result.getObjCGCAttr() != GCAttr) 3803 Result = QualType(); 3804 } 3805 return Result; 3806 } 3807 } 3808 3809 // Same as above for arrays 3810 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 3811 LHSClass = Type::ConstantArray; 3812 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 3813 RHSClass = Type::ConstantArray; 3814 3815 // Canonicalize ExtVector -> Vector. 3816 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 3817 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 3818 3819 // If the canonical type classes don't match. 3820 if (LHSClass != RHSClass) { 3821 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 3822 // a signed integer type, or an unsigned integer type. 3823 if (const EnumType* ETy = LHS->getAsEnumType()) { 3824 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 3825 return RHS; 3826 } 3827 if (const EnumType* ETy = RHS->getAsEnumType()) { 3828 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 3829 return LHS; 3830 } 3831 3832 return QualType(); 3833 } 3834 3835 // The canonical type classes match. 3836 switch (LHSClass) { 3837#define TYPE(Class, Base) 3838#define ABSTRACT_TYPE(Class, Base) 3839#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3840#define DEPENDENT_TYPE(Class, Base) case Type::Class: 3841#include "clang/AST/TypeNodes.def" 3842 assert(false && "Non-canonical and dependent types shouldn't get here"); 3843 return QualType(); 3844 3845 case Type::LValueReference: 3846 case Type::RValueReference: 3847 case Type::MemberPointer: 3848 assert(false && "C++ should never be in mergeTypes"); 3849 return QualType(); 3850 3851 case Type::IncompleteArray: 3852 case Type::VariableArray: 3853 case Type::FunctionProto: 3854 case Type::ExtVector: 3855 assert(false && "Types are eliminated above"); 3856 return QualType(); 3857 3858 case Type::Pointer: 3859 { 3860 // Merge two pointer types, while trying to preserve typedef info 3861 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 3862 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 3863 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3864 if (ResultType.isNull()) return QualType(); 3865 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3866 return LHS; 3867 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3868 return RHS; 3869 return getPointerType(ResultType); 3870 } 3871 case Type::BlockPointer: 3872 { 3873 // Merge two block pointer types, while trying to preserve typedef info 3874 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 3875 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 3876 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 3877 if (ResultType.isNull()) return QualType(); 3878 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 3879 return LHS; 3880 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 3881 return RHS; 3882 return getBlockPointerType(ResultType); 3883 } 3884 case Type::ConstantArray: 3885 { 3886 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 3887 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 3888 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 3889 return QualType(); 3890 3891 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 3892 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 3893 QualType ResultType = mergeTypes(LHSElem, RHSElem); 3894 if (ResultType.isNull()) return QualType(); 3895 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3896 return LHS; 3897 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3898 return RHS; 3899 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 3900 ArrayType::ArraySizeModifier(), 0); 3901 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 3902 ArrayType::ArraySizeModifier(), 0); 3903 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 3904 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 3905 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 3906 return LHS; 3907 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 3908 return RHS; 3909 if (LVAT) { 3910 // FIXME: This isn't correct! But tricky to implement because 3911 // the array's size has to be the size of LHS, but the type 3912 // has to be different. 3913 return LHS; 3914 } 3915 if (RVAT) { 3916 // FIXME: This isn't correct! But tricky to implement because 3917 // the array's size has to be the size of RHS, but the type 3918 // has to be different. 3919 return RHS; 3920 } 3921 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 3922 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 3923 return getIncompleteArrayType(ResultType, 3924 ArrayType::ArraySizeModifier(), 0); 3925 } 3926 case Type::FunctionNoProto: 3927 return mergeFunctionTypes(LHS, RHS); 3928 case Type::Record: 3929 case Type::Enum: 3930 return QualType(); 3931 case Type::Builtin: 3932 // Only exactly equal builtin types are compatible, which is tested above. 3933 return QualType(); 3934 case Type::Complex: 3935 // Distinct complex types are incompatible. 3936 return QualType(); 3937 case Type::Vector: 3938 // FIXME: The merged type should be an ExtVector! 3939 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 3940 return LHS; 3941 return QualType(); 3942 case Type::ObjCInterface: { 3943 // Check if the interfaces are assignment compatible. 3944 // FIXME: This should be type compatibility, e.g. whether 3945 // "LHS x; RHS x;" at global scope is legal. 3946 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 3947 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 3948 if (LHSIface && RHSIface && 3949 canAssignObjCInterfaces(LHSIface, RHSIface)) 3950 return LHS; 3951 3952 return QualType(); 3953 } 3954 case Type::ObjCObjectPointer: { 3955 if (canAssignObjCInterfaces(LHS->getAsObjCObjectPointerType(), 3956 RHS->getAsObjCObjectPointerType())) 3957 return LHS; 3958 3959 return QualType(); 3960 } 3961 case Type::FixedWidthInt: 3962 // Distinct fixed-width integers are not compatible. 3963 return QualType(); 3964 case Type::ExtQual: 3965 // FIXME: ExtQual types can be compatible even if they're not 3966 // identical! 3967 return QualType(); 3968 // First attempt at an implementation, but I'm not really sure it's 3969 // right... 3970#if 0 3971 ExtQualType* LQual = cast<ExtQualType>(LHSCan); 3972 ExtQualType* RQual = cast<ExtQualType>(RHSCan); 3973 if (LQual->getAddressSpace() != RQual->getAddressSpace() || 3974 LQual->getObjCGCAttr() != RQual->getObjCGCAttr()) 3975 return QualType(); 3976 QualType LHSBase, RHSBase, ResultType, ResCanUnqual; 3977 LHSBase = QualType(LQual->getBaseType(), 0); 3978 RHSBase = QualType(RQual->getBaseType(), 0); 3979 ResultType = mergeTypes(LHSBase, RHSBase); 3980 if (ResultType.isNull()) return QualType(); 3981 ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType(); 3982 if (LHSCan.getUnqualifiedType() == ResCanUnqual) 3983 return LHS; 3984 if (RHSCan.getUnqualifiedType() == ResCanUnqual) 3985 return RHS; 3986 ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace()); 3987 ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr()); 3988 ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers()); 3989 return ResultType; 3990#endif 3991 3992 case Type::TemplateSpecialization: 3993 assert(false && "Dependent types have no size"); 3994 break; 3995 } 3996 3997 return QualType(); 3998} 3999 4000//===----------------------------------------------------------------------===// 4001// Integer Predicates 4002//===----------------------------------------------------------------------===// 4003 4004unsigned ASTContext::getIntWidth(QualType T) { 4005 if (T == BoolTy) 4006 return 1; 4007 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) { 4008 return FWIT->getWidth(); 4009 } 4010 // For builtin types, just use the standard type sizing method 4011 return (unsigned)getTypeSize(T); 4012} 4013 4014QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4015 assert(T->isSignedIntegerType() && "Unexpected type"); 4016 if (const EnumType* ETy = T->getAsEnumType()) 4017 T = ETy->getDecl()->getIntegerType(); 4018 const BuiltinType* BTy = T->getAsBuiltinType(); 4019 assert (BTy && "Unexpected signed integer type"); 4020 switch (BTy->getKind()) { 4021 case BuiltinType::Char_S: 4022 case BuiltinType::SChar: 4023 return UnsignedCharTy; 4024 case BuiltinType::Short: 4025 return UnsignedShortTy; 4026 case BuiltinType::Int: 4027 return UnsignedIntTy; 4028 case BuiltinType::Long: 4029 return UnsignedLongTy; 4030 case BuiltinType::LongLong: 4031 return UnsignedLongLongTy; 4032 case BuiltinType::Int128: 4033 return UnsignedInt128Ty; 4034 default: 4035 assert(0 && "Unexpected signed integer type"); 4036 return QualType(); 4037 } 4038} 4039 4040ExternalASTSource::~ExternalASTSource() { } 4041 4042void ExternalASTSource::PrintStats() { } 4043 4044 4045//===----------------------------------------------------------------------===// 4046// Builtin Type Computation 4047//===----------------------------------------------------------------------===// 4048 4049/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4050/// pointer over the consumed characters. This returns the resultant type. 4051static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4052 ASTContext::GetBuiltinTypeError &Error, 4053 bool AllowTypeModifiers = true) { 4054 // Modifiers. 4055 int HowLong = 0; 4056 bool Signed = false, Unsigned = false; 4057 4058 // Read the modifiers first. 4059 bool Done = false; 4060 while (!Done) { 4061 switch (*Str++) { 4062 default: Done = true; --Str; break; 4063 case 'S': 4064 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4065 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4066 Signed = true; 4067 break; 4068 case 'U': 4069 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4070 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4071 Unsigned = true; 4072 break; 4073 case 'L': 4074 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4075 ++HowLong; 4076 break; 4077 } 4078 } 4079 4080 QualType Type; 4081 4082 // Read the base type. 4083 switch (*Str++) { 4084 default: assert(0 && "Unknown builtin type letter!"); 4085 case 'v': 4086 assert(HowLong == 0 && !Signed && !Unsigned && 4087 "Bad modifiers used with 'v'!"); 4088 Type = Context.VoidTy; 4089 break; 4090 case 'f': 4091 assert(HowLong == 0 && !Signed && !Unsigned && 4092 "Bad modifiers used with 'f'!"); 4093 Type = Context.FloatTy; 4094 break; 4095 case 'd': 4096 assert(HowLong < 2 && !Signed && !Unsigned && 4097 "Bad modifiers used with 'd'!"); 4098 if (HowLong) 4099 Type = Context.LongDoubleTy; 4100 else 4101 Type = Context.DoubleTy; 4102 break; 4103 case 's': 4104 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4105 if (Unsigned) 4106 Type = Context.UnsignedShortTy; 4107 else 4108 Type = Context.ShortTy; 4109 break; 4110 case 'i': 4111 if (HowLong == 3) 4112 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4113 else if (HowLong == 2) 4114 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4115 else if (HowLong == 1) 4116 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4117 else 4118 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4119 break; 4120 case 'c': 4121 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4122 if (Signed) 4123 Type = Context.SignedCharTy; 4124 else if (Unsigned) 4125 Type = Context.UnsignedCharTy; 4126 else 4127 Type = Context.CharTy; 4128 break; 4129 case 'b': // boolean 4130 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4131 Type = Context.BoolTy; 4132 break; 4133 case 'z': // size_t. 4134 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4135 Type = Context.getSizeType(); 4136 break; 4137 case 'F': 4138 Type = Context.getCFConstantStringType(); 4139 break; 4140 case 'a': 4141 Type = Context.getBuiltinVaListType(); 4142 assert(!Type.isNull() && "builtin va list type not initialized!"); 4143 break; 4144 case 'A': 4145 // This is a "reference" to a va_list; however, what exactly 4146 // this means depends on how va_list is defined. There are two 4147 // different kinds of va_list: ones passed by value, and ones 4148 // passed by reference. An example of a by-value va_list is 4149 // x86, where va_list is a char*. An example of by-ref va_list 4150 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4151 // we want this argument to be a char*&; for x86-64, we want 4152 // it to be a __va_list_tag*. 4153 Type = Context.getBuiltinVaListType(); 4154 assert(!Type.isNull() && "builtin va list type not initialized!"); 4155 if (Type->isArrayType()) { 4156 Type = Context.getArrayDecayedType(Type); 4157 } else { 4158 Type = Context.getLValueReferenceType(Type); 4159 } 4160 break; 4161 case 'V': { 4162 char *End; 4163 unsigned NumElements = strtoul(Str, &End, 10); 4164 assert(End != Str && "Missing vector size"); 4165 4166 Str = End; 4167 4168 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4169 Type = Context.getVectorType(ElementType, NumElements); 4170 break; 4171 } 4172 case 'P': 4173 Type = Context.getFILEType(); 4174 if (Type.isNull()) { 4175 Error = ASTContext::GE_Missing_stdio; 4176 return QualType(); 4177 } 4178 break; 4179 case 'J': 4180 if (Signed) 4181 Type = Context.getsigjmp_bufType(); 4182 else 4183 Type = Context.getjmp_bufType(); 4184 4185 if (Type.isNull()) { 4186 Error = ASTContext::GE_Missing_setjmp; 4187 return QualType(); 4188 } 4189 break; 4190 } 4191 4192 if (!AllowTypeModifiers) 4193 return Type; 4194 4195 Done = false; 4196 while (!Done) { 4197 switch (*Str++) { 4198 default: Done = true; --Str; break; 4199 case '*': 4200 Type = Context.getPointerType(Type); 4201 break; 4202 case '&': 4203 Type = Context.getLValueReferenceType(Type); 4204 break; 4205 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4206 case 'C': 4207 Type = Type.getQualifiedType(QualType::Const); 4208 break; 4209 } 4210 } 4211 4212 return Type; 4213} 4214 4215/// GetBuiltinType - Return the type for the specified builtin. 4216QualType ASTContext::GetBuiltinType(unsigned id, 4217 GetBuiltinTypeError &Error) { 4218 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4219 4220 llvm::SmallVector<QualType, 8> ArgTypes; 4221 4222 Error = GE_None; 4223 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4224 if (Error != GE_None) 4225 return QualType(); 4226 while (TypeStr[0] && TypeStr[0] != '.') { 4227 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4228 if (Error != GE_None) 4229 return QualType(); 4230 4231 // Do array -> pointer decay. The builtin should use the decayed type. 4232 if (Ty->isArrayType()) 4233 Ty = getArrayDecayedType(Ty); 4234 4235 ArgTypes.push_back(Ty); 4236 } 4237 4238 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4239 "'.' should only occur at end of builtin type list!"); 4240 4241 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4242 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4243 return getFunctionNoProtoType(ResType); 4244 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4245 TypeStr[0] == '.', 0); 4246} 4247 4248QualType 4249ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4250 // Perform the usual unary conversions. We do this early so that 4251 // integral promotions to "int" can allow us to exit early, in the 4252 // lhs == rhs check. Also, for conversion purposes, we ignore any 4253 // qualifiers. For example, "const float" and "float" are 4254 // equivalent. 4255 if (lhs->isPromotableIntegerType()) 4256 lhs = getPromotedIntegerType(lhs); 4257 else 4258 lhs = lhs.getUnqualifiedType(); 4259 if (rhs->isPromotableIntegerType()) 4260 rhs = getPromotedIntegerType(rhs); 4261 else 4262 rhs = rhs.getUnqualifiedType(); 4263 4264 // If both types are identical, no conversion is needed. 4265 if (lhs == rhs) 4266 return lhs; 4267 4268 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4269 // The caller can deal with this (e.g. pointer + int). 4270 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4271 return lhs; 4272 4273 // At this point, we have two different arithmetic types. 4274 4275 // Handle complex types first (C99 6.3.1.8p1). 4276 if (lhs->isComplexType() || rhs->isComplexType()) { 4277 // if we have an integer operand, the result is the complex type. 4278 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4279 // convert the rhs to the lhs complex type. 4280 return lhs; 4281 } 4282 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4283 // convert the lhs to the rhs complex type. 4284 return rhs; 4285 } 4286 // This handles complex/complex, complex/float, or float/complex. 4287 // When both operands are complex, the shorter operand is converted to the 4288 // type of the longer, and that is the type of the result. This corresponds 4289 // to what is done when combining two real floating-point operands. 4290 // The fun begins when size promotion occur across type domains. 4291 // From H&S 6.3.4: When one operand is complex and the other is a real 4292 // floating-point type, the less precise type is converted, within it's 4293 // real or complex domain, to the precision of the other type. For example, 4294 // when combining a "long double" with a "double _Complex", the 4295 // "double _Complex" is promoted to "long double _Complex". 4296 int result = getFloatingTypeOrder(lhs, rhs); 4297 4298 if (result > 0) { // The left side is bigger, convert rhs. 4299 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4300 } else if (result < 0) { // The right side is bigger, convert lhs. 4301 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4302 } 4303 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4304 // domains match. This is a requirement for our implementation, C99 4305 // does not require this promotion. 4306 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4307 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4308 return rhs; 4309 } else { // handle "_Complex double, double". 4310 return lhs; 4311 } 4312 } 4313 return lhs; // The domain/size match exactly. 4314 } 4315 // Now handle "real" floating types (i.e. float, double, long double). 4316 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4317 // if we have an integer operand, the result is the real floating type. 4318 if (rhs->isIntegerType()) { 4319 // convert rhs to the lhs floating point type. 4320 return lhs; 4321 } 4322 if (rhs->isComplexIntegerType()) { 4323 // convert rhs to the complex floating point type. 4324 return getComplexType(lhs); 4325 } 4326 if (lhs->isIntegerType()) { 4327 // convert lhs to the rhs floating point type. 4328 return rhs; 4329 } 4330 if (lhs->isComplexIntegerType()) { 4331 // convert lhs to the complex floating point type. 4332 return getComplexType(rhs); 4333 } 4334 // We have two real floating types, float/complex combos were handled above. 4335 // Convert the smaller operand to the bigger result. 4336 int result = getFloatingTypeOrder(lhs, rhs); 4337 if (result > 0) // convert the rhs 4338 return lhs; 4339 assert(result < 0 && "illegal float comparison"); 4340 return rhs; // convert the lhs 4341 } 4342 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4343 // Handle GCC complex int extension. 4344 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4345 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4346 4347 if (lhsComplexInt && rhsComplexInt) { 4348 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4349 rhsComplexInt->getElementType()) >= 0) 4350 return lhs; // convert the rhs 4351 return rhs; 4352 } else if (lhsComplexInt && rhs->isIntegerType()) { 4353 // convert the rhs to the lhs complex type. 4354 return lhs; 4355 } else if (rhsComplexInt && lhs->isIntegerType()) { 4356 // convert the lhs to the rhs complex type. 4357 return rhs; 4358 } 4359 } 4360 // Finally, we have two differing integer types. 4361 // The rules for this case are in C99 6.3.1.8 4362 int compare = getIntegerTypeOrder(lhs, rhs); 4363 bool lhsSigned = lhs->isSignedIntegerType(), 4364 rhsSigned = rhs->isSignedIntegerType(); 4365 QualType destType; 4366 if (lhsSigned == rhsSigned) { 4367 // Same signedness; use the higher-ranked type 4368 destType = compare >= 0 ? lhs : rhs; 4369 } else if (compare != (lhsSigned ? 1 : -1)) { 4370 // The unsigned type has greater than or equal rank to the 4371 // signed type, so use the unsigned type 4372 destType = lhsSigned ? rhs : lhs; 4373 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4374 // The two types are different widths; if we are here, that 4375 // means the signed type is larger than the unsigned type, so 4376 // use the signed type. 4377 destType = lhsSigned ? lhs : rhs; 4378 } else { 4379 // The signed type is higher-ranked than the unsigned type, 4380 // but isn't actually any bigger (like unsigned int and long 4381 // on most 32-bit systems). Use the unsigned type corresponding 4382 // to the signed type. 4383 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4384 } 4385 return destType; 4386} 4387