ASTContext.cpp revision ff676cb48fe8bf7be2feaa251dc7c5fb15af4730
1//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/CharUnits.h" 16#include "clang/AST/DeclCXX.h" 17#include "clang/AST/DeclObjC.h" 18#include "clang/AST/DeclTemplate.h" 19#include "clang/AST/TypeLoc.h" 20#include "clang/AST/Expr.h" 21#include "clang/AST/ExprCXX.h" 22#include "clang/AST/ExternalASTSource.h" 23#include "clang/AST/ASTMutationListener.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/Mangle.h" 26#include "clang/Basic/Builtins.h" 27#include "clang/Basic/SourceManager.h" 28#include "clang/Basic/TargetInfo.h" 29#include "llvm/ADT/SmallString.h" 30#include "llvm/ADT/StringExtras.h" 31#include "llvm/Support/MathExtras.h" 32#include "llvm/Support/raw_ostream.h" 33#include "CXXABI.h" 34 35using namespace clang; 36 37unsigned ASTContext::NumImplicitDefaultConstructors; 38unsigned ASTContext::NumImplicitDefaultConstructorsDeclared; 39unsigned ASTContext::NumImplicitCopyConstructors; 40unsigned ASTContext::NumImplicitCopyConstructorsDeclared; 41unsigned ASTContext::NumImplicitCopyAssignmentOperators; 42unsigned ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 43unsigned ASTContext::NumImplicitDestructors; 44unsigned ASTContext::NumImplicitDestructorsDeclared; 45 46enum FloatingRank { 47 FloatRank, DoubleRank, LongDoubleRank 48}; 49 50void 51ASTContext::CanonicalTemplateTemplateParm::Profile(llvm::FoldingSetNodeID &ID, 52 TemplateTemplateParmDecl *Parm) { 53 ID.AddInteger(Parm->getDepth()); 54 ID.AddInteger(Parm->getPosition()); 55 ID.AddBoolean(Parm->isParameterPack()); 56 57 TemplateParameterList *Params = Parm->getTemplateParameters(); 58 ID.AddInteger(Params->size()); 59 for (TemplateParameterList::const_iterator P = Params->begin(), 60 PEnd = Params->end(); 61 P != PEnd; ++P) { 62 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*P)) { 63 ID.AddInteger(0); 64 ID.AddBoolean(TTP->isParameterPack()); 65 continue; 66 } 67 68 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(*P)) { 69 ID.AddInteger(1); 70 ID.AddBoolean(NTTP->isParameterPack()); 71 ID.AddPointer(NTTP->getType().getAsOpaquePtr()); 72 if (NTTP->isExpandedParameterPack()) { 73 ID.AddBoolean(true); 74 ID.AddInteger(NTTP->getNumExpansionTypes()); 75 for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I) 76 ID.AddPointer(NTTP->getExpansionType(I).getAsOpaquePtr()); 77 } else 78 ID.AddBoolean(false); 79 continue; 80 } 81 82 TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(*P); 83 ID.AddInteger(2); 84 Profile(ID, TTP); 85 } 86} 87 88TemplateTemplateParmDecl * 89ASTContext::getCanonicalTemplateTemplateParmDecl( 90 TemplateTemplateParmDecl *TTP) const { 91 // Check if we already have a canonical template template parameter. 92 llvm::FoldingSetNodeID ID; 93 CanonicalTemplateTemplateParm::Profile(ID, TTP); 94 void *InsertPos = 0; 95 CanonicalTemplateTemplateParm *Canonical 96 = CanonTemplateTemplateParms.FindNodeOrInsertPos(ID, InsertPos); 97 if (Canonical) 98 return Canonical->getParam(); 99 100 // Build a canonical template parameter list. 101 TemplateParameterList *Params = TTP->getTemplateParameters(); 102 llvm::SmallVector<NamedDecl *, 4> CanonParams; 103 CanonParams.reserve(Params->size()); 104 for (TemplateParameterList::const_iterator P = Params->begin(), 105 PEnd = Params->end(); 106 P != PEnd; ++P) { 107 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*P)) 108 CanonParams.push_back( 109 TemplateTypeParmDecl::Create(*this, getTranslationUnitDecl(), 110 SourceLocation(), 111 SourceLocation(), 112 TTP->getDepth(), 113 TTP->getIndex(), 0, false, 114 TTP->isParameterPack())); 115 else if (NonTypeTemplateParmDecl *NTTP 116 = dyn_cast<NonTypeTemplateParmDecl>(*P)) { 117 QualType T = getCanonicalType(NTTP->getType()); 118 TypeSourceInfo *TInfo = getTrivialTypeSourceInfo(T); 119 NonTypeTemplateParmDecl *Param; 120 if (NTTP->isExpandedParameterPack()) { 121 llvm::SmallVector<QualType, 2> ExpandedTypes; 122 llvm::SmallVector<TypeSourceInfo *, 2> ExpandedTInfos; 123 for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I) { 124 ExpandedTypes.push_back(getCanonicalType(NTTP->getExpansionType(I))); 125 ExpandedTInfos.push_back( 126 getTrivialTypeSourceInfo(ExpandedTypes.back())); 127 } 128 129 Param = NonTypeTemplateParmDecl::Create(*this, getTranslationUnitDecl(), 130 SourceLocation(), 131 SourceLocation(), 132 NTTP->getDepth(), 133 NTTP->getPosition(), 0, 134 T, 135 TInfo, 136 ExpandedTypes.data(), 137 ExpandedTypes.size(), 138 ExpandedTInfos.data()); 139 } else { 140 Param = NonTypeTemplateParmDecl::Create(*this, getTranslationUnitDecl(), 141 SourceLocation(), 142 SourceLocation(), 143 NTTP->getDepth(), 144 NTTP->getPosition(), 0, 145 T, 146 NTTP->isParameterPack(), 147 TInfo); 148 } 149 CanonParams.push_back(Param); 150 151 } else 152 CanonParams.push_back(getCanonicalTemplateTemplateParmDecl( 153 cast<TemplateTemplateParmDecl>(*P))); 154 } 155 156 TemplateTemplateParmDecl *CanonTTP 157 = TemplateTemplateParmDecl::Create(*this, getTranslationUnitDecl(), 158 SourceLocation(), TTP->getDepth(), 159 TTP->getPosition(), 160 TTP->isParameterPack(), 161 0, 162 TemplateParameterList::Create(*this, SourceLocation(), 163 SourceLocation(), 164 CanonParams.data(), 165 CanonParams.size(), 166 SourceLocation())); 167 168 // Get the new insert position for the node we care about. 169 Canonical = CanonTemplateTemplateParms.FindNodeOrInsertPos(ID, InsertPos); 170 assert(Canonical == 0 && "Shouldn't be in the map!"); 171 (void)Canonical; 172 173 // Create the canonical template template parameter entry. 174 Canonical = new (*this) CanonicalTemplateTemplateParm(CanonTTP); 175 CanonTemplateTemplateParms.InsertNode(Canonical, InsertPos); 176 return CanonTTP; 177} 178 179CXXABI *ASTContext::createCXXABI(const TargetInfo &T) { 180 if (!LangOpts.CPlusPlus) return 0; 181 182 switch (T.getCXXABI()) { 183 case CXXABI_ARM: 184 return CreateARMCXXABI(*this); 185 case CXXABI_Itanium: 186 return CreateItaniumCXXABI(*this); 187 case CXXABI_Microsoft: 188 return CreateMicrosoftCXXABI(*this); 189 } 190 return 0; 191} 192 193ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 194 const TargetInfo &t, 195 IdentifierTable &idents, SelectorTable &sels, 196 Builtin::Context &builtins, 197 unsigned size_reserve) : 198 TemplateSpecializationTypes(this_()), 199 DependentTemplateSpecializationTypes(this_()), 200 GlobalNestedNameSpecifier(0), IsInt128Installed(false), 201 CFConstantStringTypeDecl(0), NSConstantStringTypeDecl(0), 202 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 203 sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0), 204 cudaConfigureCallDecl(0), 205 NullTypeSourceInfo(QualType()), 206 SourceMgr(SM), LangOpts(LOpts), ABI(createCXXABI(t)), Target(t), 207 Idents(idents), Selectors(sels), 208 BuiltinInfo(builtins), 209 DeclarationNames(*this), 210 ExternalSource(0), Listener(0), PrintingPolicy(LOpts), 211 LastSDM(0, 0), 212 UniqueBlockByRefTypeID(0) { 213 ObjCIdRedefinitionType = QualType(); 214 ObjCClassRedefinitionType = QualType(); 215 ObjCSelRedefinitionType = QualType(); 216 if (size_reserve > 0) Types.reserve(size_reserve); 217 TUDecl = TranslationUnitDecl::Create(*this); 218 InitBuiltinTypes(); 219} 220 221ASTContext::~ASTContext() { 222 // Release the DenseMaps associated with DeclContext objects. 223 // FIXME: Is this the ideal solution? 224 ReleaseDeclContextMaps(); 225 226 // Call all of the deallocation functions. 227 for (unsigned I = 0, N = Deallocations.size(); I != N; ++I) 228 Deallocations[I].first(Deallocations[I].second); 229 230 // Release all of the memory associated with overridden C++ methods. 231 for (llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::iterator 232 OM = OverriddenMethods.begin(), OMEnd = OverriddenMethods.end(); 233 OM != OMEnd; ++OM) 234 OM->second.Destroy(); 235 236 // ASTRecordLayout objects in ASTRecordLayouts must always be destroyed 237 // because they can contain DenseMaps. 238 for (llvm::DenseMap<const ObjCContainerDecl*, 239 const ASTRecordLayout*>::iterator 240 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); I != E; ) 241 // Increment in loop to prevent using deallocated memory. 242 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 243 R->Destroy(*this); 244 245 for (llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 246 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); I != E; ) { 247 // Increment in loop to prevent using deallocated memory. 248 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 249 R->Destroy(*this); 250 } 251 252 for (llvm::DenseMap<const Decl*, AttrVec*>::iterator A = DeclAttrs.begin(), 253 AEnd = DeclAttrs.end(); 254 A != AEnd; ++A) 255 A->second->~AttrVec(); 256} 257 258void ASTContext::AddDeallocation(void (*Callback)(void*), void *Data) { 259 Deallocations.push_back(std::make_pair(Callback, Data)); 260} 261 262void 263ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 264 ExternalSource.reset(Source.take()); 265} 266 267void ASTContext::PrintStats() const { 268 fprintf(stderr, "*** AST Context Stats:\n"); 269 fprintf(stderr, " %d types total.\n", (int)Types.size()); 270 271 unsigned counts[] = { 272#define TYPE(Name, Parent) 0, 273#define ABSTRACT_TYPE(Name, Parent) 274#include "clang/AST/TypeNodes.def" 275 0 // Extra 276 }; 277 278 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 279 Type *T = Types[i]; 280 counts[(unsigned)T->getTypeClass()]++; 281 } 282 283 unsigned Idx = 0; 284 unsigned TotalBytes = 0; 285#define TYPE(Name, Parent) \ 286 if (counts[Idx]) \ 287 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 288 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 289 ++Idx; 290#define ABSTRACT_TYPE(Name, Parent) 291#include "clang/AST/TypeNodes.def" 292 293 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 294 295 // Implicit special member functions. 296 fprintf(stderr, " %u/%u implicit default constructors created\n", 297 NumImplicitDefaultConstructorsDeclared, 298 NumImplicitDefaultConstructors); 299 fprintf(stderr, " %u/%u implicit copy constructors created\n", 300 NumImplicitCopyConstructorsDeclared, 301 NumImplicitCopyConstructors); 302 fprintf(stderr, " %u/%u implicit copy assignment operators created\n", 303 NumImplicitCopyAssignmentOperatorsDeclared, 304 NumImplicitCopyAssignmentOperators); 305 fprintf(stderr, " %u/%u implicit destructors created\n", 306 NumImplicitDestructorsDeclared, NumImplicitDestructors); 307 308 if (ExternalSource.get()) { 309 fprintf(stderr, "\n"); 310 ExternalSource->PrintStats(); 311 } 312 313 BumpAlloc.PrintStats(); 314} 315 316 317void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 318 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 319 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 320 Types.push_back(Ty); 321} 322 323void ASTContext::InitBuiltinTypes() { 324 assert(VoidTy.isNull() && "Context reinitialized?"); 325 326 // C99 6.2.5p19. 327 InitBuiltinType(VoidTy, BuiltinType::Void); 328 329 // C99 6.2.5p2. 330 InitBuiltinType(BoolTy, BuiltinType::Bool); 331 // C99 6.2.5p3. 332 if (LangOpts.CharIsSigned) 333 InitBuiltinType(CharTy, BuiltinType::Char_S); 334 else 335 InitBuiltinType(CharTy, BuiltinType::Char_U); 336 // C99 6.2.5p4. 337 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 338 InitBuiltinType(ShortTy, BuiltinType::Short); 339 InitBuiltinType(IntTy, BuiltinType::Int); 340 InitBuiltinType(LongTy, BuiltinType::Long); 341 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 342 343 // C99 6.2.5p6. 344 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 345 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 346 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 347 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 348 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 349 350 // C99 6.2.5p10. 351 InitBuiltinType(FloatTy, BuiltinType::Float); 352 InitBuiltinType(DoubleTy, BuiltinType::Double); 353 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 354 355 // GNU extension, 128-bit integers. 356 InitBuiltinType(Int128Ty, BuiltinType::Int128); 357 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 358 359 if (LangOpts.CPlusPlus) { // C++ 3.9.1p5 360 if (!LangOpts.ShortWChar) 361 InitBuiltinType(WCharTy, BuiltinType::WChar_S); 362 else // -fshort-wchar makes wchar_t be unsigned. 363 InitBuiltinType(WCharTy, BuiltinType::WChar_U); 364 } else // C99 365 WCharTy = getFromTargetType(Target.getWCharType()); 366 367 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 368 InitBuiltinType(Char16Ty, BuiltinType::Char16); 369 else // C99 370 Char16Ty = getFromTargetType(Target.getChar16Type()); 371 372 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 373 InitBuiltinType(Char32Ty, BuiltinType::Char32); 374 else // C99 375 Char32Ty = getFromTargetType(Target.getChar32Type()); 376 377 // Placeholder type for type-dependent expressions whose type is 378 // completely unknown. No code should ever check a type against 379 // DependentTy and users should never see it; however, it is here to 380 // help diagnose failures to properly check for type-dependent 381 // expressions. 382 InitBuiltinType(DependentTy, BuiltinType::Dependent); 383 384 // Placeholder type for functions. 385 InitBuiltinType(OverloadTy, BuiltinType::Overload); 386 387 // C99 6.2.5p11. 388 FloatComplexTy = getComplexType(FloatTy); 389 DoubleComplexTy = getComplexType(DoubleTy); 390 LongDoubleComplexTy = getComplexType(LongDoubleTy); 391 392 BuiltinVaListType = QualType(); 393 394 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 395 ObjCIdTypedefType = QualType(); 396 ObjCClassTypedefType = QualType(); 397 ObjCSelTypedefType = QualType(); 398 399 // Builtin types for 'id', 'Class', and 'SEL'. 400 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 401 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 402 InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel); 403 404 ObjCConstantStringType = QualType(); 405 406 // void * type 407 VoidPtrTy = getPointerType(VoidTy); 408 409 // nullptr type (C++0x 2.14.7) 410 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 411} 412 413Diagnostic &ASTContext::getDiagnostics() const { 414 return SourceMgr.getDiagnostics(); 415} 416 417AttrVec& ASTContext::getDeclAttrs(const Decl *D) { 418 AttrVec *&Result = DeclAttrs[D]; 419 if (!Result) { 420 void *Mem = Allocate(sizeof(AttrVec)); 421 Result = new (Mem) AttrVec; 422 } 423 424 return *Result; 425} 426 427/// \brief Erase the attributes corresponding to the given declaration. 428void ASTContext::eraseDeclAttrs(const Decl *D) { 429 llvm::DenseMap<const Decl*, AttrVec*>::iterator Pos = DeclAttrs.find(D); 430 if (Pos != DeclAttrs.end()) { 431 Pos->second->~AttrVec(); 432 DeclAttrs.erase(Pos); 433 } 434} 435 436 437MemberSpecializationInfo * 438ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 439 assert(Var->isStaticDataMember() && "Not a static data member"); 440 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 441 = InstantiatedFromStaticDataMember.find(Var); 442 if (Pos == InstantiatedFromStaticDataMember.end()) 443 return 0; 444 445 return Pos->second; 446} 447 448void 449ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 450 TemplateSpecializationKind TSK, 451 SourceLocation PointOfInstantiation) { 452 assert(Inst->isStaticDataMember() && "Not a static data member"); 453 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 454 assert(!InstantiatedFromStaticDataMember[Inst] && 455 "Already noted what static data member was instantiated from"); 456 InstantiatedFromStaticDataMember[Inst] 457 = new (*this) MemberSpecializationInfo(Tmpl, TSK, PointOfInstantiation); 458} 459 460NamedDecl * 461ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) { 462 llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos 463 = InstantiatedFromUsingDecl.find(UUD); 464 if (Pos == InstantiatedFromUsingDecl.end()) 465 return 0; 466 467 return Pos->second; 468} 469 470void 471ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) { 472 assert((isa<UsingDecl>(Pattern) || 473 isa<UnresolvedUsingValueDecl>(Pattern) || 474 isa<UnresolvedUsingTypenameDecl>(Pattern)) && 475 "pattern decl is not a using decl"); 476 assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists"); 477 InstantiatedFromUsingDecl[Inst] = Pattern; 478} 479 480UsingShadowDecl * 481ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) { 482 llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos 483 = InstantiatedFromUsingShadowDecl.find(Inst); 484 if (Pos == InstantiatedFromUsingShadowDecl.end()) 485 return 0; 486 487 return Pos->second; 488} 489 490void 491ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst, 492 UsingShadowDecl *Pattern) { 493 assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists"); 494 InstantiatedFromUsingShadowDecl[Inst] = Pattern; 495} 496 497FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 498 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 499 = InstantiatedFromUnnamedFieldDecl.find(Field); 500 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 501 return 0; 502 503 return Pos->second; 504} 505 506void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 507 FieldDecl *Tmpl) { 508 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 509 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 510 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 511 "Already noted what unnamed field was instantiated from"); 512 513 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 514} 515 516ASTContext::overridden_cxx_method_iterator 517ASTContext::overridden_methods_begin(const CXXMethodDecl *Method) const { 518 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 519 = OverriddenMethods.find(Method); 520 if (Pos == OverriddenMethods.end()) 521 return 0; 522 523 return Pos->second.begin(); 524} 525 526ASTContext::overridden_cxx_method_iterator 527ASTContext::overridden_methods_end(const CXXMethodDecl *Method) const { 528 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 529 = OverriddenMethods.find(Method); 530 if (Pos == OverriddenMethods.end()) 531 return 0; 532 533 return Pos->second.end(); 534} 535 536unsigned 537ASTContext::overridden_methods_size(const CXXMethodDecl *Method) const { 538 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 539 = OverriddenMethods.find(Method); 540 if (Pos == OverriddenMethods.end()) 541 return 0; 542 543 return Pos->second.size(); 544} 545 546void ASTContext::addOverriddenMethod(const CXXMethodDecl *Method, 547 const CXXMethodDecl *Overridden) { 548 OverriddenMethods[Method].push_back(Overridden); 549} 550 551//===----------------------------------------------------------------------===// 552// Type Sizing and Analysis 553//===----------------------------------------------------------------------===// 554 555/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 556/// scalar floating point type. 557const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 558 const BuiltinType *BT = T->getAs<BuiltinType>(); 559 assert(BT && "Not a floating point type!"); 560 switch (BT->getKind()) { 561 default: assert(0 && "Not a floating point type!"); 562 case BuiltinType::Float: return Target.getFloatFormat(); 563 case BuiltinType::Double: return Target.getDoubleFormat(); 564 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 565 } 566} 567 568/// getDeclAlign - Return a conservative estimate of the alignment of the 569/// specified decl. Note that bitfields do not have a valid alignment, so 570/// this method will assert on them. 571/// If @p RefAsPointee, references are treated like their underlying type 572/// (for alignof), else they're treated like pointers (for CodeGen). 573CharUnits ASTContext::getDeclAlign(const Decl *D, bool RefAsPointee) const { 574 unsigned Align = Target.getCharWidth(); 575 576 bool UseAlignAttrOnly = false; 577 if (unsigned AlignFromAttr = D->getMaxAlignment()) { 578 Align = AlignFromAttr; 579 580 // __attribute__((aligned)) can increase or decrease alignment 581 // *except* on a struct or struct member, where it only increases 582 // alignment unless 'packed' is also specified. 583 // 584 // It is an error for [[align]] to decrease alignment, so we can 585 // ignore that possibility; Sema should diagnose it. 586 if (isa<FieldDecl>(D)) { 587 UseAlignAttrOnly = D->hasAttr<PackedAttr>() || 588 cast<FieldDecl>(D)->getParent()->hasAttr<PackedAttr>(); 589 } else { 590 UseAlignAttrOnly = true; 591 } 592 } 593 594 // If we're using the align attribute only, just ignore everything 595 // else about the declaration and its type. 596 if (UseAlignAttrOnly) { 597 // do nothing 598 599 } else if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 600 QualType T = VD->getType(); 601 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 602 if (RefAsPointee) 603 T = RT->getPointeeType(); 604 else 605 T = getPointerType(RT->getPointeeType()); 606 } 607 if (!T->isIncompleteType() && !T->isFunctionType()) { 608 // Adjust alignments of declarations with array type by the 609 // large-array alignment on the target. 610 unsigned MinWidth = Target.getLargeArrayMinWidth(); 611 const ArrayType *arrayType; 612 if (MinWidth && (arrayType = getAsArrayType(T))) { 613 if (isa<VariableArrayType>(arrayType)) 614 Align = std::max(Align, Target.getLargeArrayAlign()); 615 else if (isa<ConstantArrayType>(arrayType) && 616 MinWidth <= getTypeSize(cast<ConstantArrayType>(arrayType))) 617 Align = std::max(Align, Target.getLargeArrayAlign()); 618 619 // Walk through any array types while we're at it. 620 T = getBaseElementType(arrayType); 621 } 622 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 623 } 624 625 // Fields can be subject to extra alignment constraints, like if 626 // the field is packed, the struct is packed, or the struct has a 627 // a max-field-alignment constraint (#pragma pack). So calculate 628 // the actual alignment of the field within the struct, and then 629 // (as we're expected to) constrain that by the alignment of the type. 630 if (const FieldDecl *field = dyn_cast<FieldDecl>(VD)) { 631 // So calculate the alignment of the field. 632 const ASTRecordLayout &layout = getASTRecordLayout(field->getParent()); 633 634 // Start with the record's overall alignment. 635 unsigned fieldAlign = toBits(layout.getAlignment()); 636 637 // Use the GCD of that and the offset within the record. 638 uint64_t offset = layout.getFieldOffset(field->getFieldIndex()); 639 if (offset > 0) { 640 // Alignment is always a power of 2, so the GCD will be a power of 2, 641 // which means we get to do this crazy thing instead of Euclid's. 642 uint64_t lowBitOfOffset = offset & (~offset + 1); 643 if (lowBitOfOffset < fieldAlign) 644 fieldAlign = static_cast<unsigned>(lowBitOfOffset); 645 } 646 647 Align = std::min(Align, fieldAlign); 648 } 649 } 650 651 return toCharUnitsFromBits(Align); 652} 653 654std::pair<CharUnits, CharUnits> 655ASTContext::getTypeInfoInChars(const Type *T) const { 656 std::pair<uint64_t, unsigned> Info = getTypeInfo(T); 657 return std::make_pair(toCharUnitsFromBits(Info.first), 658 toCharUnitsFromBits(Info.second)); 659} 660 661std::pair<CharUnits, CharUnits> 662ASTContext::getTypeInfoInChars(QualType T) const { 663 return getTypeInfoInChars(T.getTypePtr()); 664} 665 666/// getTypeSize - Return the size of the specified type, in bits. This method 667/// does not work on incomplete types. 668/// 669/// FIXME: Pointers into different addr spaces could have different sizes and 670/// alignment requirements: getPointerInfo should take an AddrSpace, this 671/// should take a QualType, &c. 672std::pair<uint64_t, unsigned> 673ASTContext::getTypeInfo(const Type *T) const { 674 uint64_t Width=0; 675 unsigned Align=8; 676 switch (T->getTypeClass()) { 677#define TYPE(Class, Base) 678#define ABSTRACT_TYPE(Class, Base) 679#define NON_CANONICAL_TYPE(Class, Base) 680#define DEPENDENT_TYPE(Class, Base) case Type::Class: 681#include "clang/AST/TypeNodes.def" 682 assert(false && "Should not see dependent types"); 683 break; 684 685 case Type::FunctionNoProto: 686 case Type::FunctionProto: 687 // GCC extension: alignof(function) = 32 bits 688 Width = 0; 689 Align = 32; 690 break; 691 692 case Type::IncompleteArray: 693 case Type::VariableArray: 694 Width = 0; 695 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 696 break; 697 698 case Type::ConstantArray: { 699 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 700 701 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 702 Width = EltInfo.first*CAT->getSize().getZExtValue(); 703 Align = EltInfo.second; 704 break; 705 } 706 case Type::ExtVector: 707 case Type::Vector: { 708 const VectorType *VT = cast<VectorType>(T); 709 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 710 Width = EltInfo.first*VT->getNumElements(); 711 Align = Width; 712 // If the alignment is not a power of 2, round up to the next power of 2. 713 // This happens for non-power-of-2 length vectors. 714 if (Align & (Align-1)) { 715 Align = llvm::NextPowerOf2(Align); 716 Width = llvm::RoundUpToAlignment(Width, Align); 717 } 718 break; 719 } 720 721 case Type::Builtin: 722 switch (cast<BuiltinType>(T)->getKind()) { 723 default: assert(0 && "Unknown builtin type!"); 724 case BuiltinType::Void: 725 // GCC extension: alignof(void) = 8 bits. 726 Width = 0; 727 Align = 8; 728 break; 729 730 case BuiltinType::Bool: 731 Width = Target.getBoolWidth(); 732 Align = Target.getBoolAlign(); 733 break; 734 case BuiltinType::Char_S: 735 case BuiltinType::Char_U: 736 case BuiltinType::UChar: 737 case BuiltinType::SChar: 738 Width = Target.getCharWidth(); 739 Align = Target.getCharAlign(); 740 break; 741 case BuiltinType::WChar_S: 742 case BuiltinType::WChar_U: 743 Width = Target.getWCharWidth(); 744 Align = Target.getWCharAlign(); 745 break; 746 case BuiltinType::Char16: 747 Width = Target.getChar16Width(); 748 Align = Target.getChar16Align(); 749 break; 750 case BuiltinType::Char32: 751 Width = Target.getChar32Width(); 752 Align = Target.getChar32Align(); 753 break; 754 case BuiltinType::UShort: 755 case BuiltinType::Short: 756 Width = Target.getShortWidth(); 757 Align = Target.getShortAlign(); 758 break; 759 case BuiltinType::UInt: 760 case BuiltinType::Int: 761 Width = Target.getIntWidth(); 762 Align = Target.getIntAlign(); 763 break; 764 case BuiltinType::ULong: 765 case BuiltinType::Long: 766 Width = Target.getLongWidth(); 767 Align = Target.getLongAlign(); 768 break; 769 case BuiltinType::ULongLong: 770 case BuiltinType::LongLong: 771 Width = Target.getLongLongWidth(); 772 Align = Target.getLongLongAlign(); 773 break; 774 case BuiltinType::Int128: 775 case BuiltinType::UInt128: 776 Width = 128; 777 Align = 128; // int128_t is 128-bit aligned on all targets. 778 break; 779 case BuiltinType::Float: 780 Width = Target.getFloatWidth(); 781 Align = Target.getFloatAlign(); 782 break; 783 case BuiltinType::Double: 784 Width = Target.getDoubleWidth(); 785 Align = Target.getDoubleAlign(); 786 break; 787 case BuiltinType::LongDouble: 788 Width = Target.getLongDoubleWidth(); 789 Align = Target.getLongDoubleAlign(); 790 break; 791 case BuiltinType::NullPtr: 792 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 793 Align = Target.getPointerAlign(0); // == sizeof(void*) 794 break; 795 case BuiltinType::ObjCId: 796 case BuiltinType::ObjCClass: 797 case BuiltinType::ObjCSel: 798 Width = Target.getPointerWidth(0); 799 Align = Target.getPointerAlign(0); 800 break; 801 } 802 break; 803 case Type::ObjCObjectPointer: 804 Width = Target.getPointerWidth(0); 805 Align = Target.getPointerAlign(0); 806 break; 807 case Type::BlockPointer: { 808 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 809 Width = Target.getPointerWidth(AS); 810 Align = Target.getPointerAlign(AS); 811 break; 812 } 813 case Type::LValueReference: 814 case Type::RValueReference: { 815 // alignof and sizeof should never enter this code path here, so we go 816 // the pointer route. 817 unsigned AS = cast<ReferenceType>(T)->getPointeeType().getAddressSpace(); 818 Width = Target.getPointerWidth(AS); 819 Align = Target.getPointerAlign(AS); 820 break; 821 } 822 case Type::Pointer: { 823 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 824 Width = Target.getPointerWidth(AS); 825 Align = Target.getPointerAlign(AS); 826 break; 827 } 828 case Type::MemberPointer: { 829 const MemberPointerType *MPT = cast<MemberPointerType>(T); 830 std::pair<uint64_t, unsigned> PtrDiffInfo = 831 getTypeInfo(getPointerDiffType()); 832 Width = PtrDiffInfo.first * ABI->getMemberPointerSize(MPT); 833 Align = PtrDiffInfo.second; 834 break; 835 } 836 case Type::Complex: { 837 // Complex types have the same alignment as their elements, but twice the 838 // size. 839 std::pair<uint64_t, unsigned> EltInfo = 840 getTypeInfo(cast<ComplexType>(T)->getElementType()); 841 Width = EltInfo.first*2; 842 Align = EltInfo.second; 843 break; 844 } 845 case Type::ObjCObject: 846 return getTypeInfo(cast<ObjCObjectType>(T)->getBaseType().getTypePtr()); 847 case Type::ObjCInterface: { 848 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 849 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 850 Width = toBits(Layout.getSize()); 851 Align = toBits(Layout.getAlignment()); 852 break; 853 } 854 case Type::Record: 855 case Type::Enum: { 856 const TagType *TT = cast<TagType>(T); 857 858 if (TT->getDecl()->isInvalidDecl()) { 859 Width = 1; 860 Align = 1; 861 break; 862 } 863 864 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 865 return getTypeInfo(ET->getDecl()->getIntegerType()); 866 867 const RecordType *RT = cast<RecordType>(TT); 868 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 869 Width = toBits(Layout.getSize()); 870 Align = toBits(Layout.getAlignment()); 871 break; 872 } 873 874 case Type::SubstTemplateTypeParm: 875 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 876 getReplacementType().getTypePtr()); 877 878 case Type::Auto: { 879 const AutoType *A = cast<AutoType>(T); 880 assert(A->isDeduced() && "Cannot request the size of a dependent type"); 881 return getTypeInfo(A->getDeducedType().getTypePtr()); 882 } 883 884 case Type::Paren: 885 return getTypeInfo(cast<ParenType>(T)->getInnerType().getTypePtr()); 886 887 case Type::Typedef: { 888 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 889 std::pair<uint64_t, unsigned> Info 890 = getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 891 // If the typedef has an aligned attribute on it, it overrides any computed 892 // alignment we have. This violates the GCC documentation (which says that 893 // attribute(aligned) can only round up) but matches its implementation. 894 if (unsigned AttrAlign = Typedef->getMaxAlignment()) 895 Align = AttrAlign; 896 else 897 Align = Info.second; 898 Width = Info.first; 899 break; 900 } 901 902 case Type::TypeOfExpr: 903 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 904 .getTypePtr()); 905 906 case Type::TypeOf: 907 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 908 909 case Type::Decltype: 910 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 911 .getTypePtr()); 912 913 case Type::Elaborated: 914 return getTypeInfo(cast<ElaboratedType>(T)->getNamedType().getTypePtr()); 915 916 case Type::Attributed: 917 return getTypeInfo( 918 cast<AttributedType>(T)->getEquivalentType().getTypePtr()); 919 920 case Type::TemplateSpecialization: 921 assert(getCanonicalType(T) != T && 922 "Cannot request the size of a dependent type"); 923 // FIXME: this is likely to be wrong once we support template 924 // aliases, since a template alias could refer to a typedef that 925 // has an __aligned__ attribute on it. 926 return getTypeInfo(getCanonicalType(T)); 927 } 928 929 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 930 return std::make_pair(Width, Align); 931} 932 933/// toCharUnitsFromBits - Convert a size in bits to a size in characters. 934CharUnits ASTContext::toCharUnitsFromBits(int64_t BitSize) const { 935 return CharUnits::fromQuantity(BitSize / getCharWidth()); 936} 937 938/// toBits - Convert a size in characters to a size in characters. 939int64_t ASTContext::toBits(CharUnits CharSize) const { 940 return CharSize.getQuantity() * getCharWidth(); 941} 942 943/// getTypeSizeInChars - Return the size of the specified type, in characters. 944/// This method does not work on incomplete types. 945CharUnits ASTContext::getTypeSizeInChars(QualType T) const { 946 return toCharUnitsFromBits(getTypeSize(T)); 947} 948CharUnits ASTContext::getTypeSizeInChars(const Type *T) const { 949 return toCharUnitsFromBits(getTypeSize(T)); 950} 951 952/// getTypeAlignInChars - Return the ABI-specified alignment of a type, in 953/// characters. This method does not work on incomplete types. 954CharUnits ASTContext::getTypeAlignInChars(QualType T) const { 955 return toCharUnitsFromBits(getTypeAlign(T)); 956} 957CharUnits ASTContext::getTypeAlignInChars(const Type *T) const { 958 return toCharUnitsFromBits(getTypeAlign(T)); 959} 960 961/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 962/// type for the current target in bits. This can be different than the ABI 963/// alignment in cases where it is beneficial for performance to overalign 964/// a data type. 965unsigned ASTContext::getPreferredTypeAlign(const Type *T) const { 966 unsigned ABIAlign = getTypeAlign(T); 967 968 // Double and long long should be naturally aligned if possible. 969 if (const ComplexType* CT = T->getAs<ComplexType>()) 970 T = CT->getElementType().getTypePtr(); 971 if (T->isSpecificBuiltinType(BuiltinType::Double) || 972 T->isSpecificBuiltinType(BuiltinType::LongLong)) 973 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 974 975 return ABIAlign; 976} 977 978/// ShallowCollectObjCIvars - 979/// Collect all ivars, including those synthesized, in the current class. 980/// 981void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 982 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) const { 983 // FIXME. This need be removed but there are two many places which 984 // assume const-ness of ObjCInterfaceDecl 985 ObjCInterfaceDecl *IDecl = const_cast<ObjCInterfaceDecl *>(OI); 986 for (ObjCIvarDecl *Iv = IDecl->all_declared_ivar_begin(); Iv; 987 Iv= Iv->getNextIvar()) 988 Ivars.push_back(Iv); 989} 990 991/// DeepCollectObjCIvars - 992/// This routine first collects all declared, but not synthesized, ivars in 993/// super class and then collects all ivars, including those synthesized for 994/// current class. This routine is used for implementation of current class 995/// when all ivars, declared and synthesized are known. 996/// 997void ASTContext::DeepCollectObjCIvars(const ObjCInterfaceDecl *OI, 998 bool leafClass, 999 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) const { 1000 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 1001 DeepCollectObjCIvars(SuperClass, false, Ivars); 1002 if (!leafClass) { 1003 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 1004 E = OI->ivar_end(); I != E; ++I) 1005 Ivars.push_back(*I); 1006 } 1007 else 1008 ShallowCollectObjCIvars(OI, Ivars); 1009} 1010 1011/// CollectInheritedProtocols - Collect all protocols in current class and 1012/// those inherited by it. 1013void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 1014 llvm::SmallPtrSet<ObjCProtocolDecl*, 8> &Protocols) { 1015 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 1016 // We can use protocol_iterator here instead of 1017 // all_referenced_protocol_iterator since we are walking all categories. 1018 for (ObjCInterfaceDecl::all_protocol_iterator P = OI->all_referenced_protocol_begin(), 1019 PE = OI->all_referenced_protocol_end(); P != PE; ++P) { 1020 ObjCProtocolDecl *Proto = (*P); 1021 Protocols.insert(Proto); 1022 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1023 PE = Proto->protocol_end(); P != PE; ++P) { 1024 Protocols.insert(*P); 1025 CollectInheritedProtocols(*P, Protocols); 1026 } 1027 } 1028 1029 // Categories of this Interface. 1030 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 1031 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 1032 CollectInheritedProtocols(CDeclChain, Protocols); 1033 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 1034 while (SD) { 1035 CollectInheritedProtocols(SD, Protocols); 1036 SD = SD->getSuperClass(); 1037 } 1038 } else if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1039 for (ObjCCategoryDecl::protocol_iterator P = OC->protocol_begin(), 1040 PE = OC->protocol_end(); P != PE; ++P) { 1041 ObjCProtocolDecl *Proto = (*P); 1042 Protocols.insert(Proto); 1043 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1044 PE = Proto->protocol_end(); P != PE; ++P) 1045 CollectInheritedProtocols(*P, Protocols); 1046 } 1047 } else if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 1048 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 1049 PE = OP->protocol_end(); P != PE; ++P) { 1050 ObjCProtocolDecl *Proto = (*P); 1051 Protocols.insert(Proto); 1052 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1053 PE = Proto->protocol_end(); P != PE; ++P) 1054 CollectInheritedProtocols(*P, Protocols); 1055 } 1056 } 1057} 1058 1059unsigned ASTContext::CountNonClassIvars(const ObjCInterfaceDecl *OI) const { 1060 unsigned count = 0; 1061 // Count ivars declared in class extension. 1062 for (const ObjCCategoryDecl *CDecl = OI->getFirstClassExtension(); CDecl; 1063 CDecl = CDecl->getNextClassExtension()) 1064 count += CDecl->ivar_size(); 1065 1066 // Count ivar defined in this class's implementation. This 1067 // includes synthesized ivars. 1068 if (ObjCImplementationDecl *ImplDecl = OI->getImplementation()) 1069 count += ImplDecl->ivar_size(); 1070 1071 return count; 1072} 1073 1074/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 1075ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 1076 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 1077 I = ObjCImpls.find(D); 1078 if (I != ObjCImpls.end()) 1079 return cast<ObjCImplementationDecl>(I->second); 1080 return 0; 1081} 1082/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 1083ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 1084 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 1085 I = ObjCImpls.find(D); 1086 if (I != ObjCImpls.end()) 1087 return cast<ObjCCategoryImplDecl>(I->second); 1088 return 0; 1089} 1090 1091/// \brief Set the implementation of ObjCInterfaceDecl. 1092void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 1093 ObjCImplementationDecl *ImplD) { 1094 assert(IFaceD && ImplD && "Passed null params"); 1095 ObjCImpls[IFaceD] = ImplD; 1096} 1097/// \brief Set the implementation of ObjCCategoryDecl. 1098void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 1099 ObjCCategoryImplDecl *ImplD) { 1100 assert(CatD && ImplD && "Passed null params"); 1101 ObjCImpls[CatD] = ImplD; 1102} 1103 1104/// \brief Get the copy initialization expression of VarDecl,or NULL if 1105/// none exists. 1106Expr *ASTContext::getBlockVarCopyInits(const VarDecl*VD) { 1107 assert(VD && "Passed null params"); 1108 assert(VD->hasAttr<BlocksAttr>() && 1109 "getBlockVarCopyInits - not __block var"); 1110 llvm::DenseMap<const VarDecl*, Expr*>::iterator 1111 I = BlockVarCopyInits.find(VD); 1112 return (I != BlockVarCopyInits.end()) ? cast<Expr>(I->second) : 0; 1113} 1114 1115/// \brief Set the copy inialization expression of a block var decl. 1116void ASTContext::setBlockVarCopyInits(VarDecl*VD, Expr* Init) { 1117 assert(VD && Init && "Passed null params"); 1118 assert(VD->hasAttr<BlocksAttr>() && 1119 "setBlockVarCopyInits - not __block var"); 1120 BlockVarCopyInits[VD] = Init; 1121} 1122 1123/// \brief Allocate an uninitialized TypeSourceInfo. 1124/// 1125/// The caller should initialize the memory held by TypeSourceInfo using 1126/// the TypeLoc wrappers. 1127/// 1128/// \param T the type that will be the basis for type source info. This type 1129/// should refer to how the declarator was written in source code, not to 1130/// what type semantic analysis resolved the declarator to. 1131TypeSourceInfo *ASTContext::CreateTypeSourceInfo(QualType T, 1132 unsigned DataSize) const { 1133 if (!DataSize) 1134 DataSize = TypeLoc::getFullDataSizeForType(T); 1135 else 1136 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 1137 "incorrect data size provided to CreateTypeSourceInfo!"); 1138 1139 TypeSourceInfo *TInfo = 1140 (TypeSourceInfo*)BumpAlloc.Allocate(sizeof(TypeSourceInfo) + DataSize, 8); 1141 new (TInfo) TypeSourceInfo(T); 1142 return TInfo; 1143} 1144 1145TypeSourceInfo *ASTContext::getTrivialTypeSourceInfo(QualType T, 1146 SourceLocation L) const { 1147 TypeSourceInfo *DI = CreateTypeSourceInfo(T); 1148 DI->getTypeLoc().initialize(const_cast<ASTContext &>(*this), L); 1149 return DI; 1150} 1151 1152const ASTRecordLayout & 1153ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) const { 1154 return getObjCLayout(D, 0); 1155} 1156 1157const ASTRecordLayout & 1158ASTContext::getASTObjCImplementationLayout( 1159 const ObjCImplementationDecl *D) const { 1160 return getObjCLayout(D->getClassInterface(), D); 1161} 1162 1163//===----------------------------------------------------------------------===// 1164// Type creation/memoization methods 1165//===----------------------------------------------------------------------===// 1166 1167QualType 1168ASTContext::getExtQualType(const Type *baseType, Qualifiers quals) const { 1169 unsigned fastQuals = quals.getFastQualifiers(); 1170 quals.removeFastQualifiers(); 1171 1172 // Check if we've already instantiated this type. 1173 llvm::FoldingSetNodeID ID; 1174 ExtQuals::Profile(ID, baseType, quals); 1175 void *insertPos = 0; 1176 if (ExtQuals *eq = ExtQualNodes.FindNodeOrInsertPos(ID, insertPos)) { 1177 assert(eq->getQualifiers() == quals); 1178 return QualType(eq, fastQuals); 1179 } 1180 1181 // If the base type is not canonical, make the appropriate canonical type. 1182 QualType canon; 1183 if (!baseType->isCanonicalUnqualified()) { 1184 SplitQualType canonSplit = baseType->getCanonicalTypeInternal().split(); 1185 canonSplit.second.addConsistentQualifiers(quals); 1186 canon = getExtQualType(canonSplit.first, canonSplit.second); 1187 1188 // Re-find the insert position. 1189 (void) ExtQualNodes.FindNodeOrInsertPos(ID, insertPos); 1190 } 1191 1192 ExtQuals *eq = new (*this, TypeAlignment) ExtQuals(baseType, canon, quals); 1193 ExtQualNodes.InsertNode(eq, insertPos); 1194 return QualType(eq, fastQuals); 1195} 1196 1197QualType 1198ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) const { 1199 QualType CanT = getCanonicalType(T); 1200 if (CanT.getAddressSpace() == AddressSpace) 1201 return T; 1202 1203 // If we are composing extended qualifiers together, merge together 1204 // into one ExtQuals node. 1205 QualifierCollector Quals; 1206 const Type *TypeNode = Quals.strip(T); 1207 1208 // If this type already has an address space specified, it cannot get 1209 // another one. 1210 assert(!Quals.hasAddressSpace() && 1211 "Type cannot be in multiple addr spaces!"); 1212 Quals.addAddressSpace(AddressSpace); 1213 1214 return getExtQualType(TypeNode, Quals); 1215} 1216 1217QualType ASTContext::getObjCGCQualType(QualType T, 1218 Qualifiers::GC GCAttr) const { 1219 QualType CanT = getCanonicalType(T); 1220 if (CanT.getObjCGCAttr() == GCAttr) 1221 return T; 1222 1223 if (const PointerType *ptr = T->getAs<PointerType>()) { 1224 QualType Pointee = ptr->getPointeeType(); 1225 if (Pointee->isAnyPointerType()) { 1226 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1227 return getPointerType(ResultType); 1228 } 1229 } 1230 1231 // If we are composing extended qualifiers together, merge together 1232 // into one ExtQuals node. 1233 QualifierCollector Quals; 1234 const Type *TypeNode = Quals.strip(T); 1235 1236 // If this type already has an ObjCGC specified, it cannot get 1237 // another one. 1238 assert(!Quals.hasObjCGCAttr() && 1239 "Type cannot have multiple ObjCGCs!"); 1240 Quals.addObjCGCAttr(GCAttr); 1241 1242 return getExtQualType(TypeNode, Quals); 1243} 1244 1245const FunctionType *ASTContext::adjustFunctionType(const FunctionType *T, 1246 FunctionType::ExtInfo Info) { 1247 if (T->getExtInfo() == Info) 1248 return T; 1249 1250 QualType Result; 1251 if (const FunctionNoProtoType *FNPT = dyn_cast<FunctionNoProtoType>(T)) { 1252 Result = getFunctionNoProtoType(FNPT->getResultType(), Info); 1253 } else { 1254 const FunctionProtoType *FPT = cast<FunctionProtoType>(T); 1255 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 1256 EPI.ExtInfo = Info; 1257 Result = getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 1258 FPT->getNumArgs(), EPI); 1259 } 1260 1261 return cast<FunctionType>(Result.getTypePtr()); 1262} 1263 1264/// getComplexType - Return the uniqued reference to the type for a complex 1265/// number with the specified element type. 1266QualType ASTContext::getComplexType(QualType T) const { 1267 // Unique pointers, to guarantee there is only one pointer of a particular 1268 // structure. 1269 llvm::FoldingSetNodeID ID; 1270 ComplexType::Profile(ID, T); 1271 1272 void *InsertPos = 0; 1273 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1274 return QualType(CT, 0); 1275 1276 // If the pointee type isn't canonical, this won't be a canonical type either, 1277 // so fill in the canonical type field. 1278 QualType Canonical; 1279 if (!T.isCanonical()) { 1280 Canonical = getComplexType(getCanonicalType(T)); 1281 1282 // Get the new insert position for the node we care about. 1283 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1284 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1285 } 1286 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1287 Types.push_back(New); 1288 ComplexTypes.InsertNode(New, InsertPos); 1289 return QualType(New, 0); 1290} 1291 1292/// getPointerType - Return the uniqued reference to the type for a pointer to 1293/// the specified type. 1294QualType ASTContext::getPointerType(QualType T) const { 1295 // Unique pointers, to guarantee there is only one pointer of a particular 1296 // structure. 1297 llvm::FoldingSetNodeID ID; 1298 PointerType::Profile(ID, T); 1299 1300 void *InsertPos = 0; 1301 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1302 return QualType(PT, 0); 1303 1304 // If the pointee type isn't canonical, this won't be a canonical type either, 1305 // so fill in the canonical type field. 1306 QualType Canonical; 1307 if (!T.isCanonical()) { 1308 Canonical = getPointerType(getCanonicalType(T)); 1309 1310 // Get the new insert position for the node we care about. 1311 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1312 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1313 } 1314 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1315 Types.push_back(New); 1316 PointerTypes.InsertNode(New, InsertPos); 1317 return QualType(New, 0); 1318} 1319 1320/// getBlockPointerType - Return the uniqued reference to the type for 1321/// a pointer to the specified block. 1322QualType ASTContext::getBlockPointerType(QualType T) const { 1323 assert(T->isFunctionType() && "block of function types only"); 1324 // Unique pointers, to guarantee there is only one block of a particular 1325 // structure. 1326 llvm::FoldingSetNodeID ID; 1327 BlockPointerType::Profile(ID, T); 1328 1329 void *InsertPos = 0; 1330 if (BlockPointerType *PT = 1331 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1332 return QualType(PT, 0); 1333 1334 // If the block pointee type isn't canonical, this won't be a canonical 1335 // type either so fill in the canonical type field. 1336 QualType Canonical; 1337 if (!T.isCanonical()) { 1338 Canonical = getBlockPointerType(getCanonicalType(T)); 1339 1340 // Get the new insert position for the node we care about. 1341 BlockPointerType *NewIP = 1342 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1343 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1344 } 1345 BlockPointerType *New 1346 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1347 Types.push_back(New); 1348 BlockPointerTypes.InsertNode(New, InsertPos); 1349 return QualType(New, 0); 1350} 1351 1352/// getLValueReferenceType - Return the uniqued reference to the type for an 1353/// lvalue reference to the specified type. 1354QualType 1355ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) const { 1356 // Unique pointers, to guarantee there is only one pointer of a particular 1357 // structure. 1358 llvm::FoldingSetNodeID ID; 1359 ReferenceType::Profile(ID, T, SpelledAsLValue); 1360 1361 void *InsertPos = 0; 1362 if (LValueReferenceType *RT = 1363 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1364 return QualType(RT, 0); 1365 1366 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1367 1368 // If the referencee type isn't canonical, this won't be a canonical type 1369 // either, so fill in the canonical type field. 1370 QualType Canonical; 1371 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1372 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1373 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1374 1375 // Get the new insert position for the node we care about. 1376 LValueReferenceType *NewIP = 1377 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1378 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1379 } 1380 1381 LValueReferenceType *New 1382 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1383 SpelledAsLValue); 1384 Types.push_back(New); 1385 LValueReferenceTypes.InsertNode(New, InsertPos); 1386 1387 return QualType(New, 0); 1388} 1389 1390/// getRValueReferenceType - Return the uniqued reference to the type for an 1391/// rvalue reference to the specified type. 1392QualType ASTContext::getRValueReferenceType(QualType T) const { 1393 // Unique pointers, to guarantee there is only one pointer of a particular 1394 // structure. 1395 llvm::FoldingSetNodeID ID; 1396 ReferenceType::Profile(ID, T, false); 1397 1398 void *InsertPos = 0; 1399 if (RValueReferenceType *RT = 1400 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1401 return QualType(RT, 0); 1402 1403 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1404 1405 // If the referencee type isn't canonical, this won't be a canonical type 1406 // either, so fill in the canonical type field. 1407 QualType Canonical; 1408 if (InnerRef || !T.isCanonical()) { 1409 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1410 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1411 1412 // Get the new insert position for the node we care about. 1413 RValueReferenceType *NewIP = 1414 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1415 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1416 } 1417 1418 RValueReferenceType *New 1419 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1420 Types.push_back(New); 1421 RValueReferenceTypes.InsertNode(New, InsertPos); 1422 return QualType(New, 0); 1423} 1424 1425/// getMemberPointerType - Return the uniqued reference to the type for a 1426/// member pointer to the specified type, in the specified class. 1427QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) const { 1428 // Unique pointers, to guarantee there is only one pointer of a particular 1429 // structure. 1430 llvm::FoldingSetNodeID ID; 1431 MemberPointerType::Profile(ID, T, Cls); 1432 1433 void *InsertPos = 0; 1434 if (MemberPointerType *PT = 1435 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1436 return QualType(PT, 0); 1437 1438 // If the pointee or class type isn't canonical, this won't be a canonical 1439 // type either, so fill in the canonical type field. 1440 QualType Canonical; 1441 if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) { 1442 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1443 1444 // Get the new insert position for the node we care about. 1445 MemberPointerType *NewIP = 1446 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1447 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1448 } 1449 MemberPointerType *New 1450 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1451 Types.push_back(New); 1452 MemberPointerTypes.InsertNode(New, InsertPos); 1453 return QualType(New, 0); 1454} 1455 1456/// getConstantArrayType - Return the unique reference to the type for an 1457/// array of the specified element type. 1458QualType ASTContext::getConstantArrayType(QualType EltTy, 1459 const llvm::APInt &ArySizeIn, 1460 ArrayType::ArraySizeModifier ASM, 1461 unsigned IndexTypeQuals) const { 1462 assert((EltTy->isDependentType() || 1463 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1464 "Constant array of VLAs is illegal!"); 1465 1466 // Convert the array size into a canonical width matching the pointer size for 1467 // the target. 1468 llvm::APInt ArySize(ArySizeIn); 1469 ArySize = 1470 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1471 1472 llvm::FoldingSetNodeID ID; 1473 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, IndexTypeQuals); 1474 1475 void *InsertPos = 0; 1476 if (ConstantArrayType *ATP = 1477 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1478 return QualType(ATP, 0); 1479 1480 // If the element type isn't canonical or has qualifiers, this won't 1481 // be a canonical type either, so fill in the canonical type field. 1482 QualType Canon; 1483 if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) { 1484 SplitQualType canonSplit = getCanonicalType(EltTy).split(); 1485 Canon = getConstantArrayType(QualType(canonSplit.first, 0), ArySize, 1486 ASM, IndexTypeQuals); 1487 Canon = getQualifiedType(Canon, canonSplit.second); 1488 1489 // Get the new insert position for the node we care about. 1490 ConstantArrayType *NewIP = 1491 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1492 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1493 } 1494 1495 ConstantArrayType *New = new(*this,TypeAlignment) 1496 ConstantArrayType(EltTy, Canon, ArySize, ASM, IndexTypeQuals); 1497 ConstantArrayTypes.InsertNode(New, InsertPos); 1498 Types.push_back(New); 1499 return QualType(New, 0); 1500} 1501 1502/// getVariableArrayDecayedType - Turns the given type, which may be 1503/// variably-modified, into the corresponding type with all the known 1504/// sizes replaced with [*]. 1505QualType ASTContext::getVariableArrayDecayedType(QualType type) const { 1506 // Vastly most common case. 1507 if (!type->isVariablyModifiedType()) return type; 1508 1509 QualType result; 1510 1511 SplitQualType split = type.getSplitDesugaredType(); 1512 const Type *ty = split.first; 1513 switch (ty->getTypeClass()) { 1514#define TYPE(Class, Base) 1515#define ABSTRACT_TYPE(Class, Base) 1516#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 1517#include "clang/AST/TypeNodes.def" 1518 llvm_unreachable("didn't desugar past all non-canonical types?"); 1519 1520 // These types should never be variably-modified. 1521 case Type::Builtin: 1522 case Type::Complex: 1523 case Type::Vector: 1524 case Type::ExtVector: 1525 case Type::DependentSizedExtVector: 1526 case Type::ObjCObject: 1527 case Type::ObjCInterface: 1528 case Type::ObjCObjectPointer: 1529 case Type::Record: 1530 case Type::Enum: 1531 case Type::UnresolvedUsing: 1532 case Type::TypeOfExpr: 1533 case Type::TypeOf: 1534 case Type::Decltype: 1535 case Type::DependentName: 1536 case Type::InjectedClassName: 1537 case Type::TemplateSpecialization: 1538 case Type::DependentTemplateSpecialization: 1539 case Type::TemplateTypeParm: 1540 case Type::SubstTemplateTypeParmPack: 1541 case Type::Auto: 1542 case Type::PackExpansion: 1543 llvm_unreachable("type should never be variably-modified"); 1544 1545 // These types can be variably-modified but should never need to 1546 // further decay. 1547 case Type::FunctionNoProto: 1548 case Type::FunctionProto: 1549 case Type::BlockPointer: 1550 case Type::MemberPointer: 1551 return type; 1552 1553 // These types can be variably-modified. All these modifications 1554 // preserve structure except as noted by comments. 1555 // TODO: if we ever care about optimizing VLAs, there are no-op 1556 // optimizations available here. 1557 case Type::Pointer: 1558 result = getPointerType(getVariableArrayDecayedType( 1559 cast<PointerType>(ty)->getPointeeType())); 1560 break; 1561 1562 case Type::LValueReference: { 1563 const LValueReferenceType *lv = cast<LValueReferenceType>(ty); 1564 result = getLValueReferenceType( 1565 getVariableArrayDecayedType(lv->getPointeeType()), 1566 lv->isSpelledAsLValue()); 1567 break; 1568 } 1569 1570 case Type::RValueReference: { 1571 const RValueReferenceType *lv = cast<RValueReferenceType>(ty); 1572 result = getRValueReferenceType( 1573 getVariableArrayDecayedType(lv->getPointeeType())); 1574 break; 1575 } 1576 1577 case Type::ConstantArray: { 1578 const ConstantArrayType *cat = cast<ConstantArrayType>(ty); 1579 result = getConstantArrayType( 1580 getVariableArrayDecayedType(cat->getElementType()), 1581 cat->getSize(), 1582 cat->getSizeModifier(), 1583 cat->getIndexTypeCVRQualifiers()); 1584 break; 1585 } 1586 1587 case Type::DependentSizedArray: { 1588 const DependentSizedArrayType *dat = cast<DependentSizedArrayType>(ty); 1589 result = getDependentSizedArrayType( 1590 getVariableArrayDecayedType(dat->getElementType()), 1591 dat->getSizeExpr(), 1592 dat->getSizeModifier(), 1593 dat->getIndexTypeCVRQualifiers(), 1594 dat->getBracketsRange()); 1595 break; 1596 } 1597 1598 // Turn incomplete types into [*] types. 1599 case Type::IncompleteArray: { 1600 const IncompleteArrayType *iat = cast<IncompleteArrayType>(ty); 1601 result = getVariableArrayType( 1602 getVariableArrayDecayedType(iat->getElementType()), 1603 /*size*/ 0, 1604 ArrayType::Normal, 1605 iat->getIndexTypeCVRQualifiers(), 1606 SourceRange()); 1607 break; 1608 } 1609 1610 // Turn VLA types into [*] types. 1611 case Type::VariableArray: { 1612 const VariableArrayType *vat = cast<VariableArrayType>(ty); 1613 result = getVariableArrayType( 1614 getVariableArrayDecayedType(vat->getElementType()), 1615 /*size*/ 0, 1616 ArrayType::Star, 1617 vat->getIndexTypeCVRQualifiers(), 1618 vat->getBracketsRange()); 1619 break; 1620 } 1621 } 1622 1623 // Apply the top-level qualifiers from the original. 1624 return getQualifiedType(result, split.second); 1625} 1626 1627/// getVariableArrayType - Returns a non-unique reference to the type for a 1628/// variable array of the specified element type. 1629QualType ASTContext::getVariableArrayType(QualType EltTy, 1630 Expr *NumElts, 1631 ArrayType::ArraySizeModifier ASM, 1632 unsigned IndexTypeQuals, 1633 SourceRange Brackets) const { 1634 // Since we don't unique expressions, it isn't possible to unique VLA's 1635 // that have an expression provided for their size. 1636 QualType Canon; 1637 1638 // Be sure to pull qualifiers off the element type. 1639 if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) { 1640 SplitQualType canonSplit = getCanonicalType(EltTy).split(); 1641 Canon = getVariableArrayType(QualType(canonSplit.first, 0), NumElts, ASM, 1642 IndexTypeQuals, Brackets); 1643 Canon = getQualifiedType(Canon, canonSplit.second); 1644 } 1645 1646 VariableArrayType *New = new(*this, TypeAlignment) 1647 VariableArrayType(EltTy, Canon, NumElts, ASM, IndexTypeQuals, Brackets); 1648 1649 VariableArrayTypes.push_back(New); 1650 Types.push_back(New); 1651 return QualType(New, 0); 1652} 1653 1654/// getDependentSizedArrayType - Returns a non-unique reference to 1655/// the type for a dependently-sized array of the specified element 1656/// type. 1657QualType ASTContext::getDependentSizedArrayType(QualType elementType, 1658 Expr *numElements, 1659 ArrayType::ArraySizeModifier ASM, 1660 unsigned elementTypeQuals, 1661 SourceRange brackets) const { 1662 assert((!numElements || numElements->isTypeDependent() || 1663 numElements->isValueDependent()) && 1664 "Size must be type- or value-dependent!"); 1665 1666 // Dependently-sized array types that do not have a specified number 1667 // of elements will have their sizes deduced from a dependent 1668 // initializer. We do no canonicalization here at all, which is okay 1669 // because they can't be used in most locations. 1670 if (!numElements) { 1671 DependentSizedArrayType *newType 1672 = new (*this, TypeAlignment) 1673 DependentSizedArrayType(*this, elementType, QualType(), 1674 numElements, ASM, elementTypeQuals, 1675 brackets); 1676 Types.push_back(newType); 1677 return QualType(newType, 0); 1678 } 1679 1680 // Otherwise, we actually build a new type every time, but we 1681 // also build a canonical type. 1682 1683 SplitQualType canonElementType = getCanonicalType(elementType).split(); 1684 1685 void *insertPos = 0; 1686 llvm::FoldingSetNodeID ID; 1687 DependentSizedArrayType::Profile(ID, *this, 1688 QualType(canonElementType.first, 0), 1689 ASM, elementTypeQuals, numElements); 1690 1691 // Look for an existing type with these properties. 1692 DependentSizedArrayType *canonTy = 1693 DependentSizedArrayTypes.FindNodeOrInsertPos(ID, insertPos); 1694 1695 // If we don't have one, build one. 1696 if (!canonTy) { 1697 canonTy = new (*this, TypeAlignment) 1698 DependentSizedArrayType(*this, QualType(canonElementType.first, 0), 1699 QualType(), numElements, ASM, elementTypeQuals, 1700 brackets); 1701 DependentSizedArrayTypes.InsertNode(canonTy, insertPos); 1702 Types.push_back(canonTy); 1703 } 1704 1705 // Apply qualifiers from the element type to the array. 1706 QualType canon = getQualifiedType(QualType(canonTy,0), 1707 canonElementType.second); 1708 1709 // If we didn't need extra canonicalization for the element type, 1710 // then just use that as our result. 1711 if (QualType(canonElementType.first, 0) == elementType) 1712 return canon; 1713 1714 // Otherwise, we need to build a type which follows the spelling 1715 // of the element type. 1716 DependentSizedArrayType *sugaredType 1717 = new (*this, TypeAlignment) 1718 DependentSizedArrayType(*this, elementType, canon, numElements, 1719 ASM, elementTypeQuals, brackets); 1720 Types.push_back(sugaredType); 1721 return QualType(sugaredType, 0); 1722} 1723 1724QualType ASTContext::getIncompleteArrayType(QualType elementType, 1725 ArrayType::ArraySizeModifier ASM, 1726 unsigned elementTypeQuals) const { 1727 llvm::FoldingSetNodeID ID; 1728 IncompleteArrayType::Profile(ID, elementType, ASM, elementTypeQuals); 1729 1730 void *insertPos = 0; 1731 if (IncompleteArrayType *iat = 1732 IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos)) 1733 return QualType(iat, 0); 1734 1735 // If the element type isn't canonical, this won't be a canonical type 1736 // either, so fill in the canonical type field. We also have to pull 1737 // qualifiers off the element type. 1738 QualType canon; 1739 1740 if (!elementType.isCanonical() || elementType.hasLocalQualifiers()) { 1741 SplitQualType canonSplit = getCanonicalType(elementType).split(); 1742 canon = getIncompleteArrayType(QualType(canonSplit.first, 0), 1743 ASM, elementTypeQuals); 1744 canon = getQualifiedType(canon, canonSplit.second); 1745 1746 // Get the new insert position for the node we care about. 1747 IncompleteArrayType *existing = 1748 IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos); 1749 assert(!existing && "Shouldn't be in the map!"); (void) existing; 1750 } 1751 1752 IncompleteArrayType *newType = new (*this, TypeAlignment) 1753 IncompleteArrayType(elementType, canon, ASM, elementTypeQuals); 1754 1755 IncompleteArrayTypes.InsertNode(newType, insertPos); 1756 Types.push_back(newType); 1757 return QualType(newType, 0); 1758} 1759 1760/// getVectorType - Return the unique reference to a vector type of 1761/// the specified element type and size. VectorType must be a built-in type. 1762QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts, 1763 VectorType::VectorKind VecKind) const { 1764 assert(vecType->isBuiltinType()); 1765 1766 // Check if we've already instantiated a vector of this type. 1767 llvm::FoldingSetNodeID ID; 1768 VectorType::Profile(ID, vecType, NumElts, Type::Vector, VecKind); 1769 1770 void *InsertPos = 0; 1771 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1772 return QualType(VTP, 0); 1773 1774 // If the element type isn't canonical, this won't be a canonical type either, 1775 // so fill in the canonical type field. 1776 QualType Canonical; 1777 if (!vecType.isCanonical()) { 1778 Canonical = getVectorType(getCanonicalType(vecType), NumElts, VecKind); 1779 1780 // Get the new insert position for the node we care about. 1781 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1782 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1783 } 1784 VectorType *New = new (*this, TypeAlignment) 1785 VectorType(vecType, NumElts, Canonical, VecKind); 1786 VectorTypes.InsertNode(New, InsertPos); 1787 Types.push_back(New); 1788 return QualType(New, 0); 1789} 1790 1791/// getExtVectorType - Return the unique reference to an extended vector type of 1792/// the specified element type and size. VectorType must be a built-in type. 1793QualType 1794ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) const { 1795 assert(vecType->isBuiltinType()); 1796 1797 // Check if we've already instantiated a vector of this type. 1798 llvm::FoldingSetNodeID ID; 1799 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector, 1800 VectorType::GenericVector); 1801 void *InsertPos = 0; 1802 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1803 return QualType(VTP, 0); 1804 1805 // If the element type isn't canonical, this won't be a canonical type either, 1806 // so fill in the canonical type field. 1807 QualType Canonical; 1808 if (!vecType.isCanonical()) { 1809 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1810 1811 // Get the new insert position for the node we care about. 1812 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1813 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1814 } 1815 ExtVectorType *New = new (*this, TypeAlignment) 1816 ExtVectorType(vecType, NumElts, Canonical); 1817 VectorTypes.InsertNode(New, InsertPos); 1818 Types.push_back(New); 1819 return QualType(New, 0); 1820} 1821 1822QualType 1823ASTContext::getDependentSizedExtVectorType(QualType vecType, 1824 Expr *SizeExpr, 1825 SourceLocation AttrLoc) const { 1826 llvm::FoldingSetNodeID ID; 1827 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1828 SizeExpr); 1829 1830 void *InsertPos = 0; 1831 DependentSizedExtVectorType *Canon 1832 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1833 DependentSizedExtVectorType *New; 1834 if (Canon) { 1835 // We already have a canonical version of this array type; use it as 1836 // the canonical type for a newly-built type. 1837 New = new (*this, TypeAlignment) 1838 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1839 SizeExpr, AttrLoc); 1840 } else { 1841 QualType CanonVecTy = getCanonicalType(vecType); 1842 if (CanonVecTy == vecType) { 1843 New = new (*this, TypeAlignment) 1844 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1845 AttrLoc); 1846 1847 DependentSizedExtVectorType *CanonCheck 1848 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1849 assert(!CanonCheck && "Dependent-sized ext_vector canonical type broken"); 1850 (void)CanonCheck; 1851 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1852 } else { 1853 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1854 SourceLocation()); 1855 New = new (*this, TypeAlignment) 1856 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1857 } 1858 } 1859 1860 Types.push_back(New); 1861 return QualType(New, 0); 1862} 1863 1864/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1865/// 1866QualType 1867ASTContext::getFunctionNoProtoType(QualType ResultTy, 1868 const FunctionType::ExtInfo &Info) const { 1869 const CallingConv DefaultCC = Info.getCC(); 1870 const CallingConv CallConv = (LangOpts.MRTD && DefaultCC == CC_Default) ? 1871 CC_X86StdCall : DefaultCC; 1872 // Unique functions, to guarantee there is only one function of a particular 1873 // structure. 1874 llvm::FoldingSetNodeID ID; 1875 FunctionNoProtoType::Profile(ID, ResultTy, Info); 1876 1877 void *InsertPos = 0; 1878 if (FunctionNoProtoType *FT = 1879 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1880 return QualType(FT, 0); 1881 1882 QualType Canonical; 1883 if (!ResultTy.isCanonical() || 1884 getCanonicalCallConv(CallConv) != CallConv) { 1885 Canonical = 1886 getFunctionNoProtoType(getCanonicalType(ResultTy), 1887 Info.withCallingConv(getCanonicalCallConv(CallConv))); 1888 1889 // Get the new insert position for the node we care about. 1890 FunctionNoProtoType *NewIP = 1891 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1892 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1893 } 1894 1895 FunctionProtoType::ExtInfo newInfo = Info.withCallingConv(CallConv); 1896 FunctionNoProtoType *New = new (*this, TypeAlignment) 1897 FunctionNoProtoType(ResultTy, Canonical, newInfo); 1898 Types.push_back(New); 1899 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1900 return QualType(New, 0); 1901} 1902 1903/// getFunctionType - Return a normal function type with a typed argument 1904/// list. isVariadic indicates whether the argument list includes '...'. 1905QualType 1906ASTContext::getFunctionType(QualType ResultTy, 1907 const QualType *ArgArray, unsigned NumArgs, 1908 const FunctionProtoType::ExtProtoInfo &EPI) const { 1909 // Unique functions, to guarantee there is only one function of a particular 1910 // structure. 1911 llvm::FoldingSetNodeID ID; 1912 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, EPI); 1913 1914 void *InsertPos = 0; 1915 if (FunctionProtoType *FTP = 1916 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1917 return QualType(FTP, 0); 1918 1919 // Determine whether the type being created is already canonical or not. 1920 bool isCanonical= EPI.ExceptionSpecType == EST_None && ResultTy.isCanonical(); 1921 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1922 if (!ArgArray[i].isCanonicalAsParam()) 1923 isCanonical = false; 1924 1925 const CallingConv DefaultCC = EPI.ExtInfo.getCC(); 1926 const CallingConv CallConv = (LangOpts.MRTD && DefaultCC == CC_Default) ? 1927 CC_X86StdCall : DefaultCC; 1928 1929 // If this type isn't canonical, get the canonical version of it. 1930 // The exception spec is not part of the canonical type. 1931 QualType Canonical; 1932 if (!isCanonical || getCanonicalCallConv(CallConv) != CallConv) { 1933 llvm::SmallVector<QualType, 16> CanonicalArgs; 1934 CanonicalArgs.reserve(NumArgs); 1935 for (unsigned i = 0; i != NumArgs; ++i) 1936 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1937 1938 FunctionProtoType::ExtProtoInfo CanonicalEPI = EPI; 1939 CanonicalEPI.ExceptionSpecType = EST_None; 1940 CanonicalEPI.NumExceptions = 0; 1941 CanonicalEPI.ExtInfo 1942 = CanonicalEPI.ExtInfo.withCallingConv(getCanonicalCallConv(CallConv)); 1943 1944 Canonical = getFunctionType(getCanonicalType(ResultTy), 1945 CanonicalArgs.data(), NumArgs, 1946 CanonicalEPI); 1947 1948 // Get the new insert position for the node we care about. 1949 FunctionProtoType *NewIP = 1950 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1951 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1952 } 1953 1954 // FunctionProtoType objects are allocated with extra bytes after them 1955 // for two variable size arrays (for parameter and exception types) at the 1956 // end of them. 1957 size_t Size = sizeof(FunctionProtoType) + 1958 NumArgs * sizeof(QualType) + 1959 EPI.NumExceptions * sizeof(QualType); 1960 FunctionProtoType *FTP = (FunctionProtoType*) Allocate(Size, TypeAlignment); 1961 FunctionProtoType::ExtProtoInfo newEPI = EPI; 1962 newEPI.ExtInfo = EPI.ExtInfo.withCallingConv(CallConv); 1963 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, Canonical, newEPI); 1964 Types.push_back(FTP); 1965 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1966 return QualType(FTP, 0); 1967} 1968 1969#ifndef NDEBUG 1970static bool NeedsInjectedClassNameType(const RecordDecl *D) { 1971 if (!isa<CXXRecordDecl>(D)) return false; 1972 const CXXRecordDecl *RD = cast<CXXRecordDecl>(D); 1973 if (isa<ClassTemplatePartialSpecializationDecl>(RD)) 1974 return true; 1975 if (RD->getDescribedClassTemplate() && 1976 !isa<ClassTemplateSpecializationDecl>(RD)) 1977 return true; 1978 return false; 1979} 1980#endif 1981 1982/// getInjectedClassNameType - Return the unique reference to the 1983/// injected class name type for the specified templated declaration. 1984QualType ASTContext::getInjectedClassNameType(CXXRecordDecl *Decl, 1985 QualType TST) const { 1986 assert(NeedsInjectedClassNameType(Decl)); 1987 if (Decl->TypeForDecl) { 1988 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1989 } else if (CXXRecordDecl *PrevDecl = Decl->getPreviousDeclaration()) { 1990 assert(PrevDecl->TypeForDecl && "previous declaration has no type"); 1991 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1992 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1993 } else { 1994 Type *newType = 1995 new (*this, TypeAlignment) InjectedClassNameType(Decl, TST); 1996 Decl->TypeForDecl = newType; 1997 Types.push_back(newType); 1998 } 1999 return QualType(Decl->TypeForDecl, 0); 2000} 2001 2002/// getTypeDeclType - Return the unique reference to the type for the 2003/// specified type declaration. 2004QualType ASTContext::getTypeDeclTypeSlow(const TypeDecl *Decl) const { 2005 assert(Decl && "Passed null for Decl param"); 2006 assert(!Decl->TypeForDecl && "TypeForDecl present in slow case"); 2007 2008 if (const TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 2009 return getTypedefType(Typedef); 2010 2011 assert(!isa<TemplateTypeParmDecl>(Decl) && 2012 "Template type parameter types are always available."); 2013 2014 if (const RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 2015 assert(!Record->getPreviousDeclaration() && 2016 "struct/union has previous declaration"); 2017 assert(!NeedsInjectedClassNameType(Record)); 2018 return getRecordType(Record); 2019 } else if (const EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 2020 assert(!Enum->getPreviousDeclaration() && 2021 "enum has previous declaration"); 2022 return getEnumType(Enum); 2023 } else if (const UnresolvedUsingTypenameDecl *Using = 2024 dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) { 2025 Type *newType = new (*this, TypeAlignment) UnresolvedUsingType(Using); 2026 Decl->TypeForDecl = newType; 2027 Types.push_back(newType); 2028 } else 2029 llvm_unreachable("TypeDecl without a type?"); 2030 2031 return QualType(Decl->TypeForDecl, 0); 2032} 2033 2034/// getTypedefType - Return the unique reference to the type for the 2035/// specified typename decl. 2036QualType 2037ASTContext::getTypedefType(const TypedefDecl *Decl, QualType Canonical) const { 2038 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2039 2040 if (Canonical.isNull()) 2041 Canonical = getCanonicalType(Decl->getUnderlyingType()); 2042 TypedefType *newType = new(*this, TypeAlignment) 2043 TypedefType(Type::Typedef, Decl, Canonical); 2044 Decl->TypeForDecl = newType; 2045 Types.push_back(newType); 2046 return QualType(newType, 0); 2047} 2048 2049QualType ASTContext::getRecordType(const RecordDecl *Decl) const { 2050 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2051 2052 if (const RecordDecl *PrevDecl = Decl->getPreviousDeclaration()) 2053 if (PrevDecl->TypeForDecl) 2054 return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0); 2055 2056 RecordType *newType = new (*this, TypeAlignment) RecordType(Decl); 2057 Decl->TypeForDecl = newType; 2058 Types.push_back(newType); 2059 return QualType(newType, 0); 2060} 2061 2062QualType ASTContext::getEnumType(const EnumDecl *Decl) const { 2063 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2064 2065 if (const EnumDecl *PrevDecl = Decl->getPreviousDeclaration()) 2066 if (PrevDecl->TypeForDecl) 2067 return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0); 2068 2069 EnumType *newType = new (*this, TypeAlignment) EnumType(Decl); 2070 Decl->TypeForDecl = newType; 2071 Types.push_back(newType); 2072 return QualType(newType, 0); 2073} 2074 2075QualType ASTContext::getAttributedType(AttributedType::Kind attrKind, 2076 QualType modifiedType, 2077 QualType equivalentType) { 2078 llvm::FoldingSetNodeID id; 2079 AttributedType::Profile(id, attrKind, modifiedType, equivalentType); 2080 2081 void *insertPos = 0; 2082 AttributedType *type = AttributedTypes.FindNodeOrInsertPos(id, insertPos); 2083 if (type) return QualType(type, 0); 2084 2085 QualType canon = getCanonicalType(equivalentType); 2086 type = new (*this, TypeAlignment) 2087 AttributedType(canon, attrKind, modifiedType, equivalentType); 2088 2089 Types.push_back(type); 2090 AttributedTypes.InsertNode(type, insertPos); 2091 2092 return QualType(type, 0); 2093} 2094 2095 2096/// \brief Retrieve a substitution-result type. 2097QualType 2098ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 2099 QualType Replacement) const { 2100 assert(Replacement.isCanonical() 2101 && "replacement types must always be canonical"); 2102 2103 llvm::FoldingSetNodeID ID; 2104 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 2105 void *InsertPos = 0; 2106 SubstTemplateTypeParmType *SubstParm 2107 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2108 2109 if (!SubstParm) { 2110 SubstParm = new (*this, TypeAlignment) 2111 SubstTemplateTypeParmType(Parm, Replacement); 2112 Types.push_back(SubstParm); 2113 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 2114 } 2115 2116 return QualType(SubstParm, 0); 2117} 2118 2119/// \brief Retrieve a 2120QualType ASTContext::getSubstTemplateTypeParmPackType( 2121 const TemplateTypeParmType *Parm, 2122 const TemplateArgument &ArgPack) { 2123#ifndef NDEBUG 2124 for (TemplateArgument::pack_iterator P = ArgPack.pack_begin(), 2125 PEnd = ArgPack.pack_end(); 2126 P != PEnd; ++P) { 2127 assert(P->getKind() == TemplateArgument::Type &&"Pack contains a non-type"); 2128 assert(P->getAsType().isCanonical() && "Pack contains non-canonical type"); 2129 } 2130#endif 2131 2132 llvm::FoldingSetNodeID ID; 2133 SubstTemplateTypeParmPackType::Profile(ID, Parm, ArgPack); 2134 void *InsertPos = 0; 2135 if (SubstTemplateTypeParmPackType *SubstParm 2136 = SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos)) 2137 return QualType(SubstParm, 0); 2138 2139 QualType Canon; 2140 if (!Parm->isCanonicalUnqualified()) { 2141 Canon = getCanonicalType(QualType(Parm, 0)); 2142 Canon = getSubstTemplateTypeParmPackType(cast<TemplateTypeParmType>(Canon), 2143 ArgPack); 2144 SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos); 2145 } 2146 2147 SubstTemplateTypeParmPackType *SubstParm 2148 = new (*this, TypeAlignment) SubstTemplateTypeParmPackType(Parm, Canon, 2149 ArgPack); 2150 Types.push_back(SubstParm); 2151 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 2152 return QualType(SubstParm, 0); 2153} 2154 2155/// \brief Retrieve the template type parameter type for a template 2156/// parameter or parameter pack with the given depth, index, and (optionally) 2157/// name. 2158QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 2159 bool ParameterPack, 2160 IdentifierInfo *Name) const { 2161 llvm::FoldingSetNodeID ID; 2162 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 2163 void *InsertPos = 0; 2164 TemplateTypeParmType *TypeParm 2165 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2166 2167 if (TypeParm) 2168 return QualType(TypeParm, 0); 2169 2170 if (Name) { 2171 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 2172 TypeParm = new (*this, TypeAlignment) 2173 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 2174 2175 TemplateTypeParmType *TypeCheck 2176 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2177 assert(!TypeCheck && "Template type parameter canonical type broken"); 2178 (void)TypeCheck; 2179 } else 2180 TypeParm = new (*this, TypeAlignment) 2181 TemplateTypeParmType(Depth, Index, ParameterPack); 2182 2183 Types.push_back(TypeParm); 2184 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 2185 2186 return QualType(TypeParm, 0); 2187} 2188 2189TypeSourceInfo * 2190ASTContext::getTemplateSpecializationTypeInfo(TemplateName Name, 2191 SourceLocation NameLoc, 2192 const TemplateArgumentListInfo &Args, 2193 QualType CanonType) const { 2194 assert(!Name.getAsDependentTemplateName() && 2195 "No dependent template names here!"); 2196 QualType TST = getTemplateSpecializationType(Name, Args, CanonType); 2197 2198 TypeSourceInfo *DI = CreateTypeSourceInfo(TST); 2199 TemplateSpecializationTypeLoc TL 2200 = cast<TemplateSpecializationTypeLoc>(DI->getTypeLoc()); 2201 TL.setTemplateNameLoc(NameLoc); 2202 TL.setLAngleLoc(Args.getLAngleLoc()); 2203 TL.setRAngleLoc(Args.getRAngleLoc()); 2204 for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i) 2205 TL.setArgLocInfo(i, Args[i].getLocInfo()); 2206 return DI; 2207} 2208 2209QualType 2210ASTContext::getTemplateSpecializationType(TemplateName Template, 2211 const TemplateArgumentListInfo &Args, 2212 QualType Canon) const { 2213 assert(!Template.getAsDependentTemplateName() && 2214 "No dependent template names here!"); 2215 2216 unsigned NumArgs = Args.size(); 2217 2218 llvm::SmallVector<TemplateArgument, 4> ArgVec; 2219 ArgVec.reserve(NumArgs); 2220 for (unsigned i = 0; i != NumArgs; ++i) 2221 ArgVec.push_back(Args[i].getArgument()); 2222 2223 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, 2224 Canon); 2225} 2226 2227QualType 2228ASTContext::getTemplateSpecializationType(TemplateName Template, 2229 const TemplateArgument *Args, 2230 unsigned NumArgs, 2231 QualType Canon) const { 2232 assert(!Template.getAsDependentTemplateName() && 2233 "No dependent template names here!"); 2234 // Look through qualified template names. 2235 if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName()) 2236 Template = TemplateName(QTN->getTemplateDecl()); 2237 2238 if (!Canon.isNull()) 2239 Canon = getCanonicalType(Canon); 2240 else 2241 Canon = getCanonicalTemplateSpecializationType(Template, Args, NumArgs); 2242 2243 // Allocate the (non-canonical) template specialization type, but don't 2244 // try to unique it: these types typically have location information that 2245 // we don't unique and don't want to lose. 2246 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 2247 sizeof(TemplateArgument) * NumArgs), 2248 TypeAlignment); 2249 TemplateSpecializationType *Spec 2250 = new (Mem) TemplateSpecializationType(Template, 2251 Args, NumArgs, 2252 Canon); 2253 2254 Types.push_back(Spec); 2255 return QualType(Spec, 0); 2256} 2257 2258QualType 2259ASTContext::getCanonicalTemplateSpecializationType(TemplateName Template, 2260 const TemplateArgument *Args, 2261 unsigned NumArgs) const { 2262 assert(!Template.getAsDependentTemplateName() && 2263 "No dependent template names here!"); 2264 // Look through qualified template names. 2265 if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName()) 2266 Template = TemplateName(QTN->getTemplateDecl()); 2267 2268 // Build the canonical template specialization type. 2269 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 2270 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 2271 CanonArgs.reserve(NumArgs); 2272 for (unsigned I = 0; I != NumArgs; ++I) 2273 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 2274 2275 // Determine whether this canonical template specialization type already 2276 // exists. 2277 llvm::FoldingSetNodeID ID; 2278 TemplateSpecializationType::Profile(ID, CanonTemplate, 2279 CanonArgs.data(), NumArgs, *this); 2280 2281 void *InsertPos = 0; 2282 TemplateSpecializationType *Spec 2283 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2284 2285 if (!Spec) { 2286 // Allocate a new canonical template specialization type. 2287 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 2288 sizeof(TemplateArgument) * NumArgs), 2289 TypeAlignment); 2290 Spec = new (Mem) TemplateSpecializationType(CanonTemplate, 2291 CanonArgs.data(), NumArgs, 2292 QualType()); 2293 Types.push_back(Spec); 2294 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 2295 } 2296 2297 assert(Spec->isDependentType() && 2298 "Non-dependent template-id type must have a canonical type"); 2299 return QualType(Spec, 0); 2300} 2301 2302QualType 2303ASTContext::getElaboratedType(ElaboratedTypeKeyword Keyword, 2304 NestedNameSpecifier *NNS, 2305 QualType NamedType) const { 2306 llvm::FoldingSetNodeID ID; 2307 ElaboratedType::Profile(ID, Keyword, NNS, NamedType); 2308 2309 void *InsertPos = 0; 2310 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2311 if (T) 2312 return QualType(T, 0); 2313 2314 QualType Canon = NamedType; 2315 if (!Canon.isCanonical()) { 2316 Canon = getCanonicalType(NamedType); 2317 ElaboratedType *CheckT = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2318 assert(!CheckT && "Elaborated canonical type broken"); 2319 (void)CheckT; 2320 } 2321 2322 T = new (*this) ElaboratedType(Keyword, NNS, NamedType, Canon); 2323 Types.push_back(T); 2324 ElaboratedTypes.InsertNode(T, InsertPos); 2325 return QualType(T, 0); 2326} 2327 2328QualType 2329ASTContext::getParenType(QualType InnerType) const { 2330 llvm::FoldingSetNodeID ID; 2331 ParenType::Profile(ID, InnerType); 2332 2333 void *InsertPos = 0; 2334 ParenType *T = ParenTypes.FindNodeOrInsertPos(ID, InsertPos); 2335 if (T) 2336 return QualType(T, 0); 2337 2338 QualType Canon = InnerType; 2339 if (!Canon.isCanonical()) { 2340 Canon = getCanonicalType(InnerType); 2341 ParenType *CheckT = ParenTypes.FindNodeOrInsertPos(ID, InsertPos); 2342 assert(!CheckT && "Paren canonical type broken"); 2343 (void)CheckT; 2344 } 2345 2346 T = new (*this) ParenType(InnerType, Canon); 2347 Types.push_back(T); 2348 ParenTypes.InsertNode(T, InsertPos); 2349 return QualType(T, 0); 2350} 2351 2352QualType ASTContext::getDependentNameType(ElaboratedTypeKeyword Keyword, 2353 NestedNameSpecifier *NNS, 2354 const IdentifierInfo *Name, 2355 QualType Canon) const { 2356 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 2357 2358 if (Canon.isNull()) { 2359 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2360 ElaboratedTypeKeyword CanonKeyword = Keyword; 2361 if (Keyword == ETK_None) 2362 CanonKeyword = ETK_Typename; 2363 2364 if (CanonNNS != NNS || CanonKeyword != Keyword) 2365 Canon = getDependentNameType(CanonKeyword, CanonNNS, Name); 2366 } 2367 2368 llvm::FoldingSetNodeID ID; 2369 DependentNameType::Profile(ID, Keyword, NNS, Name); 2370 2371 void *InsertPos = 0; 2372 DependentNameType *T 2373 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 2374 if (T) 2375 return QualType(T, 0); 2376 2377 T = new (*this) DependentNameType(Keyword, NNS, Name, Canon); 2378 Types.push_back(T); 2379 DependentNameTypes.InsertNode(T, InsertPos); 2380 return QualType(T, 0); 2381} 2382 2383QualType 2384ASTContext::getDependentTemplateSpecializationType( 2385 ElaboratedTypeKeyword Keyword, 2386 NestedNameSpecifier *NNS, 2387 const IdentifierInfo *Name, 2388 const TemplateArgumentListInfo &Args) const { 2389 // TODO: avoid this copy 2390 llvm::SmallVector<TemplateArgument, 16> ArgCopy; 2391 for (unsigned I = 0, E = Args.size(); I != E; ++I) 2392 ArgCopy.push_back(Args[I].getArgument()); 2393 return getDependentTemplateSpecializationType(Keyword, NNS, Name, 2394 ArgCopy.size(), 2395 ArgCopy.data()); 2396} 2397 2398QualType 2399ASTContext::getDependentTemplateSpecializationType( 2400 ElaboratedTypeKeyword Keyword, 2401 NestedNameSpecifier *NNS, 2402 const IdentifierInfo *Name, 2403 unsigned NumArgs, 2404 const TemplateArgument *Args) const { 2405 assert((!NNS || NNS->isDependent()) && 2406 "nested-name-specifier must be dependent"); 2407 2408 llvm::FoldingSetNodeID ID; 2409 DependentTemplateSpecializationType::Profile(ID, *this, Keyword, NNS, 2410 Name, NumArgs, Args); 2411 2412 void *InsertPos = 0; 2413 DependentTemplateSpecializationType *T 2414 = DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2415 if (T) 2416 return QualType(T, 0); 2417 2418 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2419 2420 ElaboratedTypeKeyword CanonKeyword = Keyword; 2421 if (Keyword == ETK_None) CanonKeyword = ETK_Typename; 2422 2423 bool AnyNonCanonArgs = false; 2424 llvm::SmallVector<TemplateArgument, 16> CanonArgs(NumArgs); 2425 for (unsigned I = 0; I != NumArgs; ++I) { 2426 CanonArgs[I] = getCanonicalTemplateArgument(Args[I]); 2427 if (!CanonArgs[I].structurallyEquals(Args[I])) 2428 AnyNonCanonArgs = true; 2429 } 2430 2431 QualType Canon; 2432 if (AnyNonCanonArgs || CanonNNS != NNS || CanonKeyword != Keyword) { 2433 Canon = getDependentTemplateSpecializationType(CanonKeyword, CanonNNS, 2434 Name, NumArgs, 2435 CanonArgs.data()); 2436 2437 // Find the insert position again. 2438 DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2439 } 2440 2441 void *Mem = Allocate((sizeof(DependentTemplateSpecializationType) + 2442 sizeof(TemplateArgument) * NumArgs), 2443 TypeAlignment); 2444 T = new (Mem) DependentTemplateSpecializationType(Keyword, NNS, 2445 Name, NumArgs, Args, Canon); 2446 Types.push_back(T); 2447 DependentTemplateSpecializationTypes.InsertNode(T, InsertPos); 2448 return QualType(T, 0); 2449} 2450 2451QualType ASTContext::getPackExpansionType(QualType Pattern, 2452 llvm::Optional<unsigned> NumExpansions) { 2453 llvm::FoldingSetNodeID ID; 2454 PackExpansionType::Profile(ID, Pattern, NumExpansions); 2455 2456 assert(Pattern->containsUnexpandedParameterPack() && 2457 "Pack expansions must expand one or more parameter packs"); 2458 void *InsertPos = 0; 2459 PackExpansionType *T 2460 = PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2461 if (T) 2462 return QualType(T, 0); 2463 2464 QualType Canon; 2465 if (!Pattern.isCanonical()) { 2466 Canon = getPackExpansionType(getCanonicalType(Pattern), NumExpansions); 2467 2468 // Find the insert position again. 2469 PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2470 } 2471 2472 T = new (*this) PackExpansionType(Pattern, Canon, NumExpansions); 2473 Types.push_back(T); 2474 PackExpansionTypes.InsertNode(T, InsertPos); 2475 return QualType(T, 0); 2476} 2477 2478/// CmpProtocolNames - Comparison predicate for sorting protocols 2479/// alphabetically. 2480static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 2481 const ObjCProtocolDecl *RHS) { 2482 return LHS->getDeclName() < RHS->getDeclName(); 2483} 2484 2485static bool areSortedAndUniqued(ObjCProtocolDecl * const *Protocols, 2486 unsigned NumProtocols) { 2487 if (NumProtocols == 0) return true; 2488 2489 for (unsigned i = 1; i != NumProtocols; ++i) 2490 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 2491 return false; 2492 return true; 2493} 2494 2495static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2496 unsigned &NumProtocols) { 2497 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2498 2499 // Sort protocols, keyed by name. 2500 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2501 2502 // Remove duplicates. 2503 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2504 NumProtocols = ProtocolsEnd-Protocols; 2505} 2506 2507QualType ASTContext::getObjCObjectType(QualType BaseType, 2508 ObjCProtocolDecl * const *Protocols, 2509 unsigned NumProtocols) const { 2510 // If the base type is an interface and there aren't any protocols 2511 // to add, then the interface type will do just fine. 2512 if (!NumProtocols && isa<ObjCInterfaceType>(BaseType)) 2513 return BaseType; 2514 2515 // Look in the folding set for an existing type. 2516 llvm::FoldingSetNodeID ID; 2517 ObjCObjectTypeImpl::Profile(ID, BaseType, Protocols, NumProtocols); 2518 void *InsertPos = 0; 2519 if (ObjCObjectType *QT = ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos)) 2520 return QualType(QT, 0); 2521 2522 // Build the canonical type, which has the canonical base type and 2523 // a sorted-and-uniqued list of protocols. 2524 QualType Canonical; 2525 bool ProtocolsSorted = areSortedAndUniqued(Protocols, NumProtocols); 2526 if (!ProtocolsSorted || !BaseType.isCanonical()) { 2527 if (!ProtocolsSorted) { 2528 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(Protocols, 2529 Protocols + NumProtocols); 2530 unsigned UniqueCount = NumProtocols; 2531 2532 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2533 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2534 &Sorted[0], UniqueCount); 2535 } else { 2536 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2537 Protocols, NumProtocols); 2538 } 2539 2540 // Regenerate InsertPos. 2541 ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos); 2542 } 2543 2544 unsigned Size = sizeof(ObjCObjectTypeImpl); 2545 Size += NumProtocols * sizeof(ObjCProtocolDecl *); 2546 void *Mem = Allocate(Size, TypeAlignment); 2547 ObjCObjectTypeImpl *T = 2548 new (Mem) ObjCObjectTypeImpl(Canonical, BaseType, Protocols, NumProtocols); 2549 2550 Types.push_back(T); 2551 ObjCObjectTypes.InsertNode(T, InsertPos); 2552 return QualType(T, 0); 2553} 2554 2555/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2556/// the given object type. 2557QualType ASTContext::getObjCObjectPointerType(QualType ObjectT) const { 2558 llvm::FoldingSetNodeID ID; 2559 ObjCObjectPointerType::Profile(ID, ObjectT); 2560 2561 void *InsertPos = 0; 2562 if (ObjCObjectPointerType *QT = 2563 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2564 return QualType(QT, 0); 2565 2566 // Find the canonical object type. 2567 QualType Canonical; 2568 if (!ObjectT.isCanonical()) { 2569 Canonical = getObjCObjectPointerType(getCanonicalType(ObjectT)); 2570 2571 // Regenerate InsertPos. 2572 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2573 } 2574 2575 // No match. 2576 void *Mem = Allocate(sizeof(ObjCObjectPointerType), TypeAlignment); 2577 ObjCObjectPointerType *QType = 2578 new (Mem) ObjCObjectPointerType(Canonical, ObjectT); 2579 2580 Types.push_back(QType); 2581 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2582 return QualType(QType, 0); 2583} 2584 2585/// getObjCInterfaceType - Return the unique reference to the type for the 2586/// specified ObjC interface decl. The list of protocols is optional. 2587QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) const { 2588 if (Decl->TypeForDecl) 2589 return QualType(Decl->TypeForDecl, 0); 2590 2591 // FIXME: redeclarations? 2592 void *Mem = Allocate(sizeof(ObjCInterfaceType), TypeAlignment); 2593 ObjCInterfaceType *T = new (Mem) ObjCInterfaceType(Decl); 2594 Decl->TypeForDecl = T; 2595 Types.push_back(T); 2596 return QualType(T, 0); 2597} 2598 2599/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2600/// TypeOfExprType AST's (since expression's are never shared). For example, 2601/// multiple declarations that refer to "typeof(x)" all contain different 2602/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2603/// on canonical type's (which are always unique). 2604QualType ASTContext::getTypeOfExprType(Expr *tofExpr) const { 2605 TypeOfExprType *toe; 2606 if (tofExpr->isTypeDependent()) { 2607 llvm::FoldingSetNodeID ID; 2608 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2609 2610 void *InsertPos = 0; 2611 DependentTypeOfExprType *Canon 2612 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2613 if (Canon) { 2614 // We already have a "canonical" version of an identical, dependent 2615 // typeof(expr) type. Use that as our canonical type. 2616 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2617 QualType((TypeOfExprType*)Canon, 0)); 2618 } 2619 else { 2620 // Build a new, canonical typeof(expr) type. 2621 Canon 2622 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2623 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2624 toe = Canon; 2625 } 2626 } else { 2627 QualType Canonical = getCanonicalType(tofExpr->getType()); 2628 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2629 } 2630 Types.push_back(toe); 2631 return QualType(toe, 0); 2632} 2633 2634/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2635/// TypeOfType AST's. The only motivation to unique these nodes would be 2636/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2637/// an issue. This doesn't effect the type checker, since it operates 2638/// on canonical type's (which are always unique). 2639QualType ASTContext::getTypeOfType(QualType tofType) const { 2640 QualType Canonical = getCanonicalType(tofType); 2641 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2642 Types.push_back(tot); 2643 return QualType(tot, 0); 2644} 2645 2646/// getDecltypeForExpr - Given an expr, will return the decltype for that 2647/// expression, according to the rules in C++0x [dcl.type.simple]p4 2648static QualType getDecltypeForExpr(const Expr *e, const ASTContext &Context) { 2649 if (e->isTypeDependent()) 2650 return Context.DependentTy; 2651 2652 // If e is an id expression or a class member access, decltype(e) is defined 2653 // as the type of the entity named by e. 2654 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2655 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2656 return VD->getType(); 2657 } 2658 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2659 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2660 return FD->getType(); 2661 } 2662 // If e is a function call or an invocation of an overloaded operator, 2663 // (parentheses around e are ignored), decltype(e) is defined as the 2664 // return type of that function. 2665 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2666 return CE->getCallReturnType(); 2667 2668 QualType T = e->getType(); 2669 2670 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2671 // defined as T&, otherwise decltype(e) is defined as T. 2672 if (e->isLValue()) 2673 T = Context.getLValueReferenceType(T); 2674 2675 return T; 2676} 2677 2678/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2679/// DecltypeType AST's. The only motivation to unique these nodes would be 2680/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2681/// an issue. This doesn't effect the type checker, since it operates 2682/// on canonical type's (which are always unique). 2683QualType ASTContext::getDecltypeType(Expr *e) const { 2684 DecltypeType *dt; 2685 if (e->isTypeDependent()) { 2686 llvm::FoldingSetNodeID ID; 2687 DependentDecltypeType::Profile(ID, *this, e); 2688 2689 void *InsertPos = 0; 2690 DependentDecltypeType *Canon 2691 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2692 if (Canon) { 2693 // We already have a "canonical" version of an equivalent, dependent 2694 // decltype type. Use that as our canonical type. 2695 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2696 QualType((DecltypeType*)Canon, 0)); 2697 } 2698 else { 2699 // Build a new, canonical typeof(expr) type. 2700 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2701 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2702 dt = Canon; 2703 } 2704 } else { 2705 QualType T = getDecltypeForExpr(e, *this); 2706 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2707 } 2708 Types.push_back(dt); 2709 return QualType(dt, 0); 2710} 2711 2712/// getAutoType - We only unique auto types after they've been deduced. 2713QualType ASTContext::getAutoType(QualType DeducedType) const { 2714 void *InsertPos = 0; 2715 if (!DeducedType.isNull()) { 2716 // Look in the folding set for an existing type. 2717 llvm::FoldingSetNodeID ID; 2718 AutoType::Profile(ID, DeducedType); 2719 if (AutoType *AT = AutoTypes.FindNodeOrInsertPos(ID, InsertPos)) 2720 return QualType(AT, 0); 2721 } 2722 2723 AutoType *AT = new (*this, TypeAlignment) AutoType(DeducedType); 2724 Types.push_back(AT); 2725 if (InsertPos) 2726 AutoTypes.InsertNode(AT, InsertPos); 2727 return QualType(AT, 0); 2728} 2729 2730/// getTagDeclType - Return the unique reference to the type for the 2731/// specified TagDecl (struct/union/class/enum) decl. 2732QualType ASTContext::getTagDeclType(const TagDecl *Decl) const { 2733 assert (Decl); 2734 // FIXME: What is the design on getTagDeclType when it requires casting 2735 // away const? mutable? 2736 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2737} 2738 2739/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2740/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2741/// needs to agree with the definition in <stddef.h>. 2742CanQualType ASTContext::getSizeType() const { 2743 return getFromTargetType(Target.getSizeType()); 2744} 2745 2746/// getSignedWCharType - Return the type of "signed wchar_t". 2747/// Used when in C++, as a GCC extension. 2748QualType ASTContext::getSignedWCharType() const { 2749 // FIXME: derive from "Target" ? 2750 return WCharTy; 2751} 2752 2753/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2754/// Used when in C++, as a GCC extension. 2755QualType ASTContext::getUnsignedWCharType() const { 2756 // FIXME: derive from "Target" ? 2757 return UnsignedIntTy; 2758} 2759 2760/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2761/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2762QualType ASTContext::getPointerDiffType() const { 2763 return getFromTargetType(Target.getPtrDiffType(0)); 2764} 2765 2766//===----------------------------------------------------------------------===// 2767// Type Operators 2768//===----------------------------------------------------------------------===// 2769 2770CanQualType ASTContext::getCanonicalParamType(QualType T) const { 2771 // Push qualifiers into arrays, and then discard any remaining 2772 // qualifiers. 2773 T = getCanonicalType(T); 2774 T = getVariableArrayDecayedType(T); 2775 const Type *Ty = T.getTypePtr(); 2776 QualType Result; 2777 if (isa<ArrayType>(Ty)) { 2778 Result = getArrayDecayedType(QualType(Ty,0)); 2779 } else if (isa<FunctionType>(Ty)) { 2780 Result = getPointerType(QualType(Ty, 0)); 2781 } else { 2782 Result = QualType(Ty, 0); 2783 } 2784 2785 return CanQualType::CreateUnsafe(Result); 2786} 2787 2788 2789QualType ASTContext::getUnqualifiedArrayType(QualType type, 2790 Qualifiers &quals) { 2791 SplitQualType splitType = type.getSplitUnqualifiedType(); 2792 2793 // FIXME: getSplitUnqualifiedType() actually walks all the way to 2794 // the unqualified desugared type and then drops it on the floor. 2795 // We then have to strip that sugar back off with 2796 // getUnqualifiedDesugaredType(), which is silly. 2797 const ArrayType *AT = 2798 dyn_cast<ArrayType>(splitType.first->getUnqualifiedDesugaredType()); 2799 2800 // If we don't have an array, just use the results in splitType. 2801 if (!AT) { 2802 quals = splitType.second; 2803 return QualType(splitType.first, 0); 2804 } 2805 2806 // Otherwise, recurse on the array's element type. 2807 QualType elementType = AT->getElementType(); 2808 QualType unqualElementType = getUnqualifiedArrayType(elementType, quals); 2809 2810 // If that didn't change the element type, AT has no qualifiers, so we 2811 // can just use the results in splitType. 2812 if (elementType == unqualElementType) { 2813 assert(quals.empty()); // from the recursive call 2814 quals = splitType.second; 2815 return QualType(splitType.first, 0); 2816 } 2817 2818 // Otherwise, add in the qualifiers from the outermost type, then 2819 // build the type back up. 2820 quals.addConsistentQualifiers(splitType.second); 2821 2822 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) { 2823 return getConstantArrayType(unqualElementType, CAT->getSize(), 2824 CAT->getSizeModifier(), 0); 2825 } 2826 2827 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 2828 return getIncompleteArrayType(unqualElementType, IAT->getSizeModifier(), 0); 2829 } 2830 2831 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(AT)) { 2832 return getVariableArrayType(unqualElementType, 2833 VAT->getSizeExpr(), 2834 VAT->getSizeModifier(), 2835 VAT->getIndexTypeCVRQualifiers(), 2836 VAT->getBracketsRange()); 2837 } 2838 2839 const DependentSizedArrayType *DSAT = cast<DependentSizedArrayType>(AT); 2840 return getDependentSizedArrayType(unqualElementType, DSAT->getSizeExpr(), 2841 DSAT->getSizeModifier(), 0, 2842 SourceRange()); 2843} 2844 2845/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 2846/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 2847/// they point to and return true. If T1 and T2 aren't pointer types 2848/// or pointer-to-member types, or if they are not similar at this 2849/// level, returns false and leaves T1 and T2 unchanged. Top-level 2850/// qualifiers on T1 and T2 are ignored. This function will typically 2851/// be called in a loop that successively "unwraps" pointer and 2852/// pointer-to-member types to compare them at each level. 2853bool ASTContext::UnwrapSimilarPointerTypes(QualType &T1, QualType &T2) { 2854 const PointerType *T1PtrType = T1->getAs<PointerType>(), 2855 *T2PtrType = T2->getAs<PointerType>(); 2856 if (T1PtrType && T2PtrType) { 2857 T1 = T1PtrType->getPointeeType(); 2858 T2 = T2PtrType->getPointeeType(); 2859 return true; 2860 } 2861 2862 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 2863 *T2MPType = T2->getAs<MemberPointerType>(); 2864 if (T1MPType && T2MPType && 2865 hasSameUnqualifiedType(QualType(T1MPType->getClass(), 0), 2866 QualType(T2MPType->getClass(), 0))) { 2867 T1 = T1MPType->getPointeeType(); 2868 T2 = T2MPType->getPointeeType(); 2869 return true; 2870 } 2871 2872 if (getLangOptions().ObjC1) { 2873 const ObjCObjectPointerType *T1OPType = T1->getAs<ObjCObjectPointerType>(), 2874 *T2OPType = T2->getAs<ObjCObjectPointerType>(); 2875 if (T1OPType && T2OPType) { 2876 T1 = T1OPType->getPointeeType(); 2877 T2 = T2OPType->getPointeeType(); 2878 return true; 2879 } 2880 } 2881 2882 // FIXME: Block pointers, too? 2883 2884 return false; 2885} 2886 2887DeclarationNameInfo 2888ASTContext::getNameForTemplate(TemplateName Name, 2889 SourceLocation NameLoc) const { 2890 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2891 // DNInfo work in progress: CHECKME: what about DNLoc? 2892 return DeclarationNameInfo(TD->getDeclName(), NameLoc); 2893 2894 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2895 DeclarationName DName; 2896 if (DTN->isIdentifier()) { 2897 DName = DeclarationNames.getIdentifier(DTN->getIdentifier()); 2898 return DeclarationNameInfo(DName, NameLoc); 2899 } else { 2900 DName = DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2901 // DNInfo work in progress: FIXME: source locations? 2902 DeclarationNameLoc DNLoc; 2903 DNLoc.CXXOperatorName.BeginOpNameLoc = SourceLocation().getRawEncoding(); 2904 DNLoc.CXXOperatorName.EndOpNameLoc = SourceLocation().getRawEncoding(); 2905 return DeclarationNameInfo(DName, NameLoc, DNLoc); 2906 } 2907 } 2908 2909 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2910 assert(Storage); 2911 // DNInfo work in progress: CHECKME: what about DNLoc? 2912 return DeclarationNameInfo((*Storage->begin())->getDeclName(), NameLoc); 2913} 2914 2915TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) const { 2916 if (TemplateDecl *Template = Name.getAsTemplateDecl()) { 2917 if (TemplateTemplateParmDecl *TTP 2918 = dyn_cast<TemplateTemplateParmDecl>(Template)) 2919 Template = getCanonicalTemplateTemplateParmDecl(TTP); 2920 2921 // The canonical template name is the canonical template declaration. 2922 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2923 } 2924 2925 if (SubstTemplateTemplateParmPackStorage *SubstPack 2926 = Name.getAsSubstTemplateTemplateParmPack()) { 2927 TemplateTemplateParmDecl *CanonParam 2928 = getCanonicalTemplateTemplateParmDecl(SubstPack->getParameterPack()); 2929 TemplateArgument CanonArgPack 2930 = getCanonicalTemplateArgument(SubstPack->getArgumentPack()); 2931 return getSubstTemplateTemplateParmPack(CanonParam, CanonArgPack); 2932 } 2933 2934 assert(!Name.getAsOverloadedTemplate()); 2935 2936 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2937 assert(DTN && "Non-dependent template names must refer to template decls."); 2938 return DTN->CanonicalTemplateName; 2939} 2940 2941bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2942 X = getCanonicalTemplateName(X); 2943 Y = getCanonicalTemplateName(Y); 2944 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2945} 2946 2947TemplateArgument 2948ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) const { 2949 switch (Arg.getKind()) { 2950 case TemplateArgument::Null: 2951 return Arg; 2952 2953 case TemplateArgument::Expression: 2954 return Arg; 2955 2956 case TemplateArgument::Declaration: 2957 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2958 2959 case TemplateArgument::Template: 2960 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2961 2962 case TemplateArgument::TemplateExpansion: 2963 return TemplateArgument(getCanonicalTemplateName( 2964 Arg.getAsTemplateOrTemplatePattern()), 2965 Arg.getNumTemplateExpansions()); 2966 2967 case TemplateArgument::Integral: 2968 return TemplateArgument(*Arg.getAsIntegral(), 2969 getCanonicalType(Arg.getIntegralType())); 2970 2971 case TemplateArgument::Type: 2972 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2973 2974 case TemplateArgument::Pack: { 2975 if (Arg.pack_size() == 0) 2976 return Arg; 2977 2978 TemplateArgument *CanonArgs 2979 = new (*this) TemplateArgument[Arg.pack_size()]; 2980 unsigned Idx = 0; 2981 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2982 AEnd = Arg.pack_end(); 2983 A != AEnd; (void)++A, ++Idx) 2984 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2985 2986 return TemplateArgument(CanonArgs, Arg.pack_size()); 2987 } 2988 } 2989 2990 // Silence GCC warning 2991 assert(false && "Unhandled template argument kind"); 2992 return TemplateArgument(); 2993} 2994 2995NestedNameSpecifier * 2996ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) const { 2997 if (!NNS) 2998 return 0; 2999 3000 switch (NNS->getKind()) { 3001 case NestedNameSpecifier::Identifier: 3002 // Canonicalize the prefix but keep the identifier the same. 3003 return NestedNameSpecifier::Create(*this, 3004 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 3005 NNS->getAsIdentifier()); 3006 3007 case NestedNameSpecifier::Namespace: 3008 // A namespace is canonical; build a nested-name-specifier with 3009 // this namespace and no prefix. 3010 return NestedNameSpecifier::Create(*this, 0, 3011 NNS->getAsNamespace()->getOriginalNamespace()); 3012 3013 case NestedNameSpecifier::NamespaceAlias: 3014 // A namespace is canonical; build a nested-name-specifier with 3015 // this namespace and no prefix. 3016 return NestedNameSpecifier::Create(*this, 0, 3017 NNS->getAsNamespaceAlias()->getNamespace() 3018 ->getOriginalNamespace()); 3019 3020 case NestedNameSpecifier::TypeSpec: 3021 case NestedNameSpecifier::TypeSpecWithTemplate: { 3022 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 3023 3024 // If we have some kind of dependent-named type (e.g., "typename T::type"), 3025 // break it apart into its prefix and identifier, then reconsititute those 3026 // as the canonical nested-name-specifier. This is required to canonicalize 3027 // a dependent nested-name-specifier involving typedefs of dependent-name 3028 // types, e.g., 3029 // typedef typename T::type T1; 3030 // typedef typename T1::type T2; 3031 if (const DependentNameType *DNT = T->getAs<DependentNameType>()) { 3032 NestedNameSpecifier *Prefix 3033 = getCanonicalNestedNameSpecifier(DNT->getQualifier()); 3034 return NestedNameSpecifier::Create(*this, Prefix, 3035 const_cast<IdentifierInfo *>(DNT->getIdentifier())); 3036 } 3037 3038 // Do the same thing as above, but with dependent-named specializations. 3039 if (const DependentTemplateSpecializationType *DTST 3040 = T->getAs<DependentTemplateSpecializationType>()) { 3041 NestedNameSpecifier *Prefix 3042 = getCanonicalNestedNameSpecifier(DTST->getQualifier()); 3043 3044 T = getDependentTemplateSpecializationType(DTST->getKeyword(), 3045 Prefix, DTST->getIdentifier(), 3046 DTST->getNumArgs(), 3047 DTST->getArgs()); 3048 T = getCanonicalType(T); 3049 } 3050 3051 return NestedNameSpecifier::Create(*this, 0, false, 3052 const_cast<Type*>(T.getTypePtr())); 3053 } 3054 3055 case NestedNameSpecifier::Global: 3056 // The global specifier is canonical and unique. 3057 return NNS; 3058 } 3059 3060 // Required to silence a GCC warning 3061 return 0; 3062} 3063 3064 3065const ArrayType *ASTContext::getAsArrayType(QualType T) const { 3066 // Handle the non-qualified case efficiently. 3067 if (!T.hasLocalQualifiers()) { 3068 // Handle the common positive case fast. 3069 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 3070 return AT; 3071 } 3072 3073 // Handle the common negative case fast. 3074 if (!isa<ArrayType>(T.getCanonicalType())) 3075 return 0; 3076 3077 // Apply any qualifiers from the array type to the element type. This 3078 // implements C99 6.7.3p8: "If the specification of an array type includes 3079 // any type qualifiers, the element type is so qualified, not the array type." 3080 3081 // If we get here, we either have type qualifiers on the type, or we have 3082 // sugar such as a typedef in the way. If we have type qualifiers on the type 3083 // we must propagate them down into the element type. 3084 3085 SplitQualType split = T.getSplitDesugaredType(); 3086 Qualifiers qs = split.second; 3087 3088 // If we have a simple case, just return now. 3089 const ArrayType *ATy = dyn_cast<ArrayType>(split.first); 3090 if (ATy == 0 || qs.empty()) 3091 return ATy; 3092 3093 // Otherwise, we have an array and we have qualifiers on it. Push the 3094 // qualifiers into the array element type and return a new array type. 3095 QualType NewEltTy = getQualifiedType(ATy->getElementType(), qs); 3096 3097 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 3098 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 3099 CAT->getSizeModifier(), 3100 CAT->getIndexTypeCVRQualifiers())); 3101 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 3102 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 3103 IAT->getSizeModifier(), 3104 IAT->getIndexTypeCVRQualifiers())); 3105 3106 if (const DependentSizedArrayType *DSAT 3107 = dyn_cast<DependentSizedArrayType>(ATy)) 3108 return cast<ArrayType>( 3109 getDependentSizedArrayType(NewEltTy, 3110 DSAT->getSizeExpr(), 3111 DSAT->getSizeModifier(), 3112 DSAT->getIndexTypeCVRQualifiers(), 3113 DSAT->getBracketsRange())); 3114 3115 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 3116 return cast<ArrayType>(getVariableArrayType(NewEltTy, 3117 VAT->getSizeExpr(), 3118 VAT->getSizeModifier(), 3119 VAT->getIndexTypeCVRQualifiers(), 3120 VAT->getBracketsRange())); 3121} 3122 3123/// getArrayDecayedType - Return the properly qualified result of decaying the 3124/// specified array type to a pointer. This operation is non-trivial when 3125/// handling typedefs etc. The canonical type of "T" must be an array type, 3126/// this returns a pointer to a properly qualified element of the array. 3127/// 3128/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 3129QualType ASTContext::getArrayDecayedType(QualType Ty) const { 3130 // Get the element type with 'getAsArrayType' so that we don't lose any 3131 // typedefs in the element type of the array. This also handles propagation 3132 // of type qualifiers from the array type into the element type if present 3133 // (C99 6.7.3p8). 3134 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 3135 assert(PrettyArrayType && "Not an array type!"); 3136 3137 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 3138 3139 // int x[restrict 4] -> int *restrict 3140 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 3141} 3142 3143QualType ASTContext::getBaseElementType(const ArrayType *array) const { 3144 return getBaseElementType(array->getElementType()); 3145} 3146 3147QualType ASTContext::getBaseElementType(QualType type) const { 3148 Qualifiers qs; 3149 while (true) { 3150 SplitQualType split = type.getSplitDesugaredType(); 3151 const ArrayType *array = split.first->getAsArrayTypeUnsafe(); 3152 if (!array) break; 3153 3154 type = array->getElementType(); 3155 qs.addConsistentQualifiers(split.second); 3156 } 3157 3158 return getQualifiedType(type, qs); 3159} 3160 3161/// getConstantArrayElementCount - Returns number of constant array elements. 3162uint64_t 3163ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 3164 uint64_t ElementCount = 1; 3165 do { 3166 ElementCount *= CA->getSize().getZExtValue(); 3167 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 3168 } while (CA); 3169 return ElementCount; 3170} 3171 3172/// getFloatingRank - Return a relative rank for floating point types. 3173/// This routine will assert if passed a built-in type that isn't a float. 3174static FloatingRank getFloatingRank(QualType T) { 3175 if (const ComplexType *CT = T->getAs<ComplexType>()) 3176 return getFloatingRank(CT->getElementType()); 3177 3178 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 3179 switch (T->getAs<BuiltinType>()->getKind()) { 3180 default: assert(0 && "getFloatingRank(): not a floating type"); 3181 case BuiltinType::Float: return FloatRank; 3182 case BuiltinType::Double: return DoubleRank; 3183 case BuiltinType::LongDouble: return LongDoubleRank; 3184 } 3185} 3186 3187/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 3188/// point or a complex type (based on typeDomain/typeSize). 3189/// 'typeDomain' is a real floating point or complex type. 3190/// 'typeSize' is a real floating point or complex type. 3191QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 3192 QualType Domain) const { 3193 FloatingRank EltRank = getFloatingRank(Size); 3194 if (Domain->isComplexType()) { 3195 switch (EltRank) { 3196 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3197 case FloatRank: return FloatComplexTy; 3198 case DoubleRank: return DoubleComplexTy; 3199 case LongDoubleRank: return LongDoubleComplexTy; 3200 } 3201 } 3202 3203 assert(Domain->isRealFloatingType() && "Unknown domain!"); 3204 switch (EltRank) { 3205 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3206 case FloatRank: return FloatTy; 3207 case DoubleRank: return DoubleTy; 3208 case LongDoubleRank: return LongDoubleTy; 3209 } 3210} 3211 3212/// getFloatingTypeOrder - Compare the rank of the two specified floating 3213/// point types, ignoring the domain of the type (i.e. 'double' == 3214/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 3215/// LHS < RHS, return -1. 3216int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) const { 3217 FloatingRank LHSR = getFloatingRank(LHS); 3218 FloatingRank RHSR = getFloatingRank(RHS); 3219 3220 if (LHSR == RHSR) 3221 return 0; 3222 if (LHSR > RHSR) 3223 return 1; 3224 return -1; 3225} 3226 3227/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 3228/// routine will assert if passed a built-in type that isn't an integer or enum, 3229/// or if it is not canonicalized. 3230unsigned ASTContext::getIntegerRank(const Type *T) const { 3231 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 3232 if (const EnumType* ET = dyn_cast<EnumType>(T)) 3233 T = ET->getDecl()->getPromotionType().getTypePtr(); 3234 3235 if (T->isSpecificBuiltinType(BuiltinType::WChar_S) || 3236 T->isSpecificBuiltinType(BuiltinType::WChar_U)) 3237 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 3238 3239 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 3240 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 3241 3242 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 3243 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 3244 3245 switch (cast<BuiltinType>(T)->getKind()) { 3246 default: assert(0 && "getIntegerRank(): not a built-in integer"); 3247 case BuiltinType::Bool: 3248 return 1 + (getIntWidth(BoolTy) << 3); 3249 case BuiltinType::Char_S: 3250 case BuiltinType::Char_U: 3251 case BuiltinType::SChar: 3252 case BuiltinType::UChar: 3253 return 2 + (getIntWidth(CharTy) << 3); 3254 case BuiltinType::Short: 3255 case BuiltinType::UShort: 3256 return 3 + (getIntWidth(ShortTy) << 3); 3257 case BuiltinType::Int: 3258 case BuiltinType::UInt: 3259 return 4 + (getIntWidth(IntTy) << 3); 3260 case BuiltinType::Long: 3261 case BuiltinType::ULong: 3262 return 5 + (getIntWidth(LongTy) << 3); 3263 case BuiltinType::LongLong: 3264 case BuiltinType::ULongLong: 3265 return 6 + (getIntWidth(LongLongTy) << 3); 3266 case BuiltinType::Int128: 3267 case BuiltinType::UInt128: 3268 return 7 + (getIntWidth(Int128Ty) << 3); 3269 } 3270} 3271 3272/// \brief Whether this is a promotable bitfield reference according 3273/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 3274/// 3275/// \returns the type this bit-field will promote to, or NULL if no 3276/// promotion occurs. 3277QualType ASTContext::isPromotableBitField(Expr *E) const { 3278 if (E->isTypeDependent() || E->isValueDependent()) 3279 return QualType(); 3280 3281 FieldDecl *Field = E->getBitField(); 3282 if (!Field) 3283 return QualType(); 3284 3285 QualType FT = Field->getType(); 3286 3287 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 3288 uint64_t BitWidth = BitWidthAP.getZExtValue(); 3289 uint64_t IntSize = getTypeSize(IntTy); 3290 // GCC extension compatibility: if the bit-field size is less than or equal 3291 // to the size of int, it gets promoted no matter what its type is. 3292 // For instance, unsigned long bf : 4 gets promoted to signed int. 3293 if (BitWidth < IntSize) 3294 return IntTy; 3295 3296 if (BitWidth == IntSize) 3297 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 3298 3299 // Types bigger than int are not subject to promotions, and therefore act 3300 // like the base type. 3301 // FIXME: This doesn't quite match what gcc does, but what gcc does here 3302 // is ridiculous. 3303 return QualType(); 3304} 3305 3306/// getPromotedIntegerType - Returns the type that Promotable will 3307/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 3308/// integer type. 3309QualType ASTContext::getPromotedIntegerType(QualType Promotable) const { 3310 assert(!Promotable.isNull()); 3311 assert(Promotable->isPromotableIntegerType()); 3312 if (const EnumType *ET = Promotable->getAs<EnumType>()) 3313 return ET->getDecl()->getPromotionType(); 3314 if (Promotable->isSignedIntegerType()) 3315 return IntTy; 3316 uint64_t PromotableSize = getTypeSize(Promotable); 3317 uint64_t IntSize = getTypeSize(IntTy); 3318 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 3319 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 3320} 3321 3322/// getIntegerTypeOrder - Returns the highest ranked integer type: 3323/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 3324/// LHS < RHS, return -1. 3325int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) const { 3326 const Type *LHSC = getCanonicalType(LHS).getTypePtr(); 3327 const Type *RHSC = getCanonicalType(RHS).getTypePtr(); 3328 if (LHSC == RHSC) return 0; 3329 3330 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 3331 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 3332 3333 unsigned LHSRank = getIntegerRank(LHSC); 3334 unsigned RHSRank = getIntegerRank(RHSC); 3335 3336 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 3337 if (LHSRank == RHSRank) return 0; 3338 return LHSRank > RHSRank ? 1 : -1; 3339 } 3340 3341 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 3342 if (LHSUnsigned) { 3343 // If the unsigned [LHS] type is larger, return it. 3344 if (LHSRank >= RHSRank) 3345 return 1; 3346 3347 // If the signed type can represent all values of the unsigned type, it 3348 // wins. Because we are dealing with 2's complement and types that are 3349 // powers of two larger than each other, this is always safe. 3350 return -1; 3351 } 3352 3353 // If the unsigned [RHS] type is larger, return it. 3354 if (RHSRank >= LHSRank) 3355 return -1; 3356 3357 // If the signed type can represent all values of the unsigned type, it 3358 // wins. Because we are dealing with 2's complement and types that are 3359 // powers of two larger than each other, this is always safe. 3360 return 1; 3361} 3362 3363static RecordDecl * 3364CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 3365 SourceLocation L, IdentifierInfo *Id) { 3366 if (Ctx.getLangOptions().CPlusPlus) 3367 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 3368 else 3369 return RecordDecl::Create(Ctx, TK, DC, L, Id); 3370} 3371 3372// getCFConstantStringType - Return the type used for constant CFStrings. 3373QualType ASTContext::getCFConstantStringType() const { 3374 if (!CFConstantStringTypeDecl) { 3375 CFConstantStringTypeDecl = 3376 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3377 &Idents.get("NSConstantString")); 3378 CFConstantStringTypeDecl->startDefinition(); 3379 3380 QualType FieldTypes[4]; 3381 3382 // const int *isa; 3383 FieldTypes[0] = getPointerType(IntTy.withConst()); 3384 // int flags; 3385 FieldTypes[1] = IntTy; 3386 // const char *str; 3387 FieldTypes[2] = getPointerType(CharTy.withConst()); 3388 // long length; 3389 FieldTypes[3] = LongTy; 3390 3391 // Create fields 3392 for (unsigned i = 0; i < 4; ++i) { 3393 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 3394 SourceLocation(), 3395 SourceLocation(), 0, 3396 FieldTypes[i], /*TInfo=*/0, 3397 /*BitWidth=*/0, 3398 /*Mutable=*/false); 3399 Field->setAccess(AS_public); 3400 CFConstantStringTypeDecl->addDecl(Field); 3401 } 3402 3403 CFConstantStringTypeDecl->completeDefinition(); 3404 } 3405 3406 return getTagDeclType(CFConstantStringTypeDecl); 3407} 3408 3409void ASTContext::setCFConstantStringType(QualType T) { 3410 const RecordType *Rec = T->getAs<RecordType>(); 3411 assert(Rec && "Invalid CFConstantStringType"); 3412 CFConstantStringTypeDecl = Rec->getDecl(); 3413} 3414 3415// getNSConstantStringType - Return the type used for constant NSStrings. 3416QualType ASTContext::getNSConstantStringType() const { 3417 if (!NSConstantStringTypeDecl) { 3418 NSConstantStringTypeDecl = 3419 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3420 &Idents.get("__builtin_NSString")); 3421 NSConstantStringTypeDecl->startDefinition(); 3422 3423 QualType FieldTypes[3]; 3424 3425 // const int *isa; 3426 FieldTypes[0] = getPointerType(IntTy.withConst()); 3427 // const char *str; 3428 FieldTypes[1] = getPointerType(CharTy.withConst()); 3429 // unsigned int length; 3430 FieldTypes[2] = UnsignedIntTy; 3431 3432 // Create fields 3433 for (unsigned i = 0; i < 3; ++i) { 3434 FieldDecl *Field = FieldDecl::Create(*this, NSConstantStringTypeDecl, 3435 SourceLocation(), 3436 SourceLocation(), 0, 3437 FieldTypes[i], /*TInfo=*/0, 3438 /*BitWidth=*/0, 3439 /*Mutable=*/false); 3440 Field->setAccess(AS_public); 3441 NSConstantStringTypeDecl->addDecl(Field); 3442 } 3443 3444 NSConstantStringTypeDecl->completeDefinition(); 3445 } 3446 3447 return getTagDeclType(NSConstantStringTypeDecl); 3448} 3449 3450void ASTContext::setNSConstantStringType(QualType T) { 3451 const RecordType *Rec = T->getAs<RecordType>(); 3452 assert(Rec && "Invalid NSConstantStringType"); 3453 NSConstantStringTypeDecl = Rec->getDecl(); 3454} 3455 3456QualType ASTContext::getObjCFastEnumerationStateType() const { 3457 if (!ObjCFastEnumerationStateTypeDecl) { 3458 ObjCFastEnumerationStateTypeDecl = 3459 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3460 &Idents.get("__objcFastEnumerationState")); 3461 ObjCFastEnumerationStateTypeDecl->startDefinition(); 3462 3463 QualType FieldTypes[] = { 3464 UnsignedLongTy, 3465 getPointerType(ObjCIdTypedefType), 3466 getPointerType(UnsignedLongTy), 3467 getConstantArrayType(UnsignedLongTy, 3468 llvm::APInt(32, 5), ArrayType::Normal, 0) 3469 }; 3470 3471 for (size_t i = 0; i < 4; ++i) { 3472 FieldDecl *Field = FieldDecl::Create(*this, 3473 ObjCFastEnumerationStateTypeDecl, 3474 SourceLocation(), 3475 SourceLocation(), 0, 3476 FieldTypes[i], /*TInfo=*/0, 3477 /*BitWidth=*/0, 3478 /*Mutable=*/false); 3479 Field->setAccess(AS_public); 3480 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 3481 } 3482 3483 ObjCFastEnumerationStateTypeDecl->completeDefinition(); 3484 } 3485 3486 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 3487} 3488 3489QualType ASTContext::getBlockDescriptorType() const { 3490 if (BlockDescriptorType) 3491 return getTagDeclType(BlockDescriptorType); 3492 3493 RecordDecl *T; 3494 // FIXME: Needs the FlagAppleBlock bit. 3495 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3496 &Idents.get("__block_descriptor")); 3497 T->startDefinition(); 3498 3499 QualType FieldTypes[] = { 3500 UnsignedLongTy, 3501 UnsignedLongTy, 3502 }; 3503 3504 const char *FieldNames[] = { 3505 "reserved", 3506 "Size" 3507 }; 3508 3509 for (size_t i = 0; i < 2; ++i) { 3510 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3511 SourceLocation(), 3512 &Idents.get(FieldNames[i]), 3513 FieldTypes[i], /*TInfo=*/0, 3514 /*BitWidth=*/0, 3515 /*Mutable=*/false); 3516 Field->setAccess(AS_public); 3517 T->addDecl(Field); 3518 } 3519 3520 T->completeDefinition(); 3521 3522 BlockDescriptorType = T; 3523 3524 return getTagDeclType(BlockDescriptorType); 3525} 3526 3527void ASTContext::setBlockDescriptorType(QualType T) { 3528 const RecordType *Rec = T->getAs<RecordType>(); 3529 assert(Rec && "Invalid BlockDescriptorType"); 3530 BlockDescriptorType = Rec->getDecl(); 3531} 3532 3533QualType ASTContext::getBlockDescriptorExtendedType() const { 3534 if (BlockDescriptorExtendedType) 3535 return getTagDeclType(BlockDescriptorExtendedType); 3536 3537 RecordDecl *T; 3538 // FIXME: Needs the FlagAppleBlock bit. 3539 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3540 &Idents.get("__block_descriptor_withcopydispose")); 3541 T->startDefinition(); 3542 3543 QualType FieldTypes[] = { 3544 UnsignedLongTy, 3545 UnsignedLongTy, 3546 getPointerType(VoidPtrTy), 3547 getPointerType(VoidPtrTy) 3548 }; 3549 3550 const char *FieldNames[] = { 3551 "reserved", 3552 "Size", 3553 "CopyFuncPtr", 3554 "DestroyFuncPtr" 3555 }; 3556 3557 for (size_t i = 0; i < 4; ++i) { 3558 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3559 SourceLocation(), 3560 &Idents.get(FieldNames[i]), 3561 FieldTypes[i], /*TInfo=*/0, 3562 /*BitWidth=*/0, 3563 /*Mutable=*/false); 3564 Field->setAccess(AS_public); 3565 T->addDecl(Field); 3566 } 3567 3568 T->completeDefinition(); 3569 3570 BlockDescriptorExtendedType = T; 3571 3572 return getTagDeclType(BlockDescriptorExtendedType); 3573} 3574 3575void ASTContext::setBlockDescriptorExtendedType(QualType T) { 3576 const RecordType *Rec = T->getAs<RecordType>(); 3577 assert(Rec && "Invalid BlockDescriptorType"); 3578 BlockDescriptorExtendedType = Rec->getDecl(); 3579} 3580 3581bool ASTContext::BlockRequiresCopying(QualType Ty) const { 3582 if (Ty->isBlockPointerType()) 3583 return true; 3584 if (isObjCNSObjectType(Ty)) 3585 return true; 3586 if (Ty->isObjCObjectPointerType()) 3587 return true; 3588 if (getLangOptions().CPlusPlus) { 3589 if (const RecordType *RT = Ty->getAs<RecordType>()) { 3590 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3591 return RD->hasConstCopyConstructor(*this); 3592 3593 } 3594 } 3595 return false; 3596} 3597 3598QualType 3599ASTContext::BuildByRefType(llvm::StringRef DeclName, QualType Ty) const { 3600 // type = struct __Block_byref_1_X { 3601 // void *__isa; 3602 // struct __Block_byref_1_X *__forwarding; 3603 // unsigned int __flags; 3604 // unsigned int __size; 3605 // void *__copy_helper; // as needed 3606 // void *__destroy_help // as needed 3607 // int X; 3608 // } * 3609 3610 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 3611 3612 // FIXME: Move up 3613 llvm::SmallString<36> Name; 3614 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 3615 ++UniqueBlockByRefTypeID << '_' << DeclName; 3616 RecordDecl *T; 3617 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3618 &Idents.get(Name.str())); 3619 T->startDefinition(); 3620 QualType Int32Ty = IntTy; 3621 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 3622 QualType FieldTypes[] = { 3623 getPointerType(VoidPtrTy), 3624 getPointerType(getTagDeclType(T)), 3625 Int32Ty, 3626 Int32Ty, 3627 getPointerType(VoidPtrTy), 3628 getPointerType(VoidPtrTy), 3629 Ty 3630 }; 3631 3632 llvm::StringRef FieldNames[] = { 3633 "__isa", 3634 "__forwarding", 3635 "__flags", 3636 "__size", 3637 "__copy_helper", 3638 "__destroy_helper", 3639 DeclName, 3640 }; 3641 3642 for (size_t i = 0; i < 7; ++i) { 3643 if (!HasCopyAndDispose && i >=4 && i <= 5) 3644 continue; 3645 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3646 SourceLocation(), 3647 &Idents.get(FieldNames[i]), 3648 FieldTypes[i], /*TInfo=*/0, 3649 /*BitWidth=*/0, /*Mutable=*/false); 3650 Field->setAccess(AS_public); 3651 T->addDecl(Field); 3652 } 3653 3654 T->completeDefinition(); 3655 3656 return getPointerType(getTagDeclType(T)); 3657} 3658 3659void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3660 const RecordType *Rec = T->getAs<RecordType>(); 3661 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3662 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3663} 3664 3665// This returns true if a type has been typedefed to BOOL: 3666// typedef <type> BOOL; 3667static bool isTypeTypedefedAsBOOL(QualType T) { 3668 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3669 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3670 return II->isStr("BOOL"); 3671 3672 return false; 3673} 3674 3675/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3676/// purpose. 3677CharUnits ASTContext::getObjCEncodingTypeSize(QualType type) const { 3678 CharUnits sz = getTypeSizeInChars(type); 3679 3680 // Make all integer and enum types at least as large as an int 3681 if (sz.isPositive() && type->isIntegralOrEnumerationType()) 3682 sz = std::max(sz, getTypeSizeInChars(IntTy)); 3683 // Treat arrays as pointers, since that's how they're passed in. 3684 else if (type->isArrayType()) 3685 sz = getTypeSizeInChars(VoidPtrTy); 3686 return sz; 3687} 3688 3689static inline 3690std::string charUnitsToString(const CharUnits &CU) { 3691 return llvm::itostr(CU.getQuantity()); 3692} 3693 3694/// getObjCEncodingForBlock - Return the encoded type for this block 3695/// declaration. 3696std::string ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr) const { 3697 std::string S; 3698 3699 const BlockDecl *Decl = Expr->getBlockDecl(); 3700 QualType BlockTy = 3701 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3702 // Encode result type. 3703 getObjCEncodingForType(BlockTy->getAs<FunctionType>()->getResultType(), S); 3704 // Compute size of all parameters. 3705 // Start with computing size of a pointer in number of bytes. 3706 // FIXME: There might(should) be a better way of doing this computation! 3707 SourceLocation Loc; 3708 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3709 CharUnits ParmOffset = PtrSize; 3710 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), 3711 E = Decl->param_end(); PI != E; ++PI) { 3712 QualType PType = (*PI)->getType(); 3713 CharUnits sz = getObjCEncodingTypeSize(PType); 3714 assert (sz.isPositive() && "BlockExpr - Incomplete param type"); 3715 ParmOffset += sz; 3716 } 3717 // Size of the argument frame 3718 S += charUnitsToString(ParmOffset); 3719 // Block pointer and offset. 3720 S += "@?0"; 3721 ParmOffset = PtrSize; 3722 3723 // Argument types. 3724 ParmOffset = PtrSize; 3725 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3726 Decl->param_end(); PI != E; ++PI) { 3727 ParmVarDecl *PVDecl = *PI; 3728 QualType PType = PVDecl->getOriginalType(); 3729 if (const ArrayType *AT = 3730 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3731 // Use array's original type only if it has known number of 3732 // elements. 3733 if (!isa<ConstantArrayType>(AT)) 3734 PType = PVDecl->getType(); 3735 } else if (PType->isFunctionType()) 3736 PType = PVDecl->getType(); 3737 getObjCEncodingForType(PType, S); 3738 S += charUnitsToString(ParmOffset); 3739 ParmOffset += getObjCEncodingTypeSize(PType); 3740 } 3741 3742 return S; 3743} 3744 3745void ASTContext::getObjCEncodingForFunctionDecl(const FunctionDecl *Decl, 3746 std::string& S) { 3747 // Encode result type. 3748 getObjCEncodingForType(Decl->getResultType(), S); 3749 CharUnits ParmOffset; 3750 // Compute size of all parameters. 3751 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3752 E = Decl->param_end(); PI != E; ++PI) { 3753 QualType PType = (*PI)->getType(); 3754 CharUnits sz = getObjCEncodingTypeSize(PType); 3755 assert (sz.isPositive() && 3756 "getObjCEncodingForMethodDecl - Incomplete param type"); 3757 ParmOffset += sz; 3758 } 3759 S += charUnitsToString(ParmOffset); 3760 ParmOffset = CharUnits::Zero(); 3761 3762 // Argument types. 3763 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3764 E = Decl->param_end(); PI != E; ++PI) { 3765 ParmVarDecl *PVDecl = *PI; 3766 QualType PType = PVDecl->getOriginalType(); 3767 if (const ArrayType *AT = 3768 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3769 // Use array's original type only if it has known number of 3770 // elements. 3771 if (!isa<ConstantArrayType>(AT)) 3772 PType = PVDecl->getType(); 3773 } else if (PType->isFunctionType()) 3774 PType = PVDecl->getType(); 3775 getObjCEncodingForType(PType, S); 3776 S += charUnitsToString(ParmOffset); 3777 ParmOffset += getObjCEncodingTypeSize(PType); 3778 } 3779} 3780 3781/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3782/// declaration. 3783void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3784 std::string& S) const { 3785 // FIXME: This is not very efficient. 3786 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3787 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3788 // Encode result type. 3789 getObjCEncodingForType(Decl->getResultType(), S); 3790 // Compute size of all parameters. 3791 // Start with computing size of a pointer in number of bytes. 3792 // FIXME: There might(should) be a better way of doing this computation! 3793 SourceLocation Loc; 3794 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3795 // The first two arguments (self and _cmd) are pointers; account for 3796 // their size. 3797 CharUnits ParmOffset = 2 * PtrSize; 3798 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3799 E = Decl->sel_param_end(); PI != E; ++PI) { 3800 QualType PType = (*PI)->getType(); 3801 CharUnits sz = getObjCEncodingTypeSize(PType); 3802 assert (sz.isPositive() && 3803 "getObjCEncodingForMethodDecl - Incomplete param type"); 3804 ParmOffset += sz; 3805 } 3806 S += charUnitsToString(ParmOffset); 3807 S += "@0:"; 3808 S += charUnitsToString(PtrSize); 3809 3810 // Argument types. 3811 ParmOffset = 2 * PtrSize; 3812 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3813 E = Decl->sel_param_end(); PI != E; ++PI) { 3814 ParmVarDecl *PVDecl = *PI; 3815 QualType PType = PVDecl->getOriginalType(); 3816 if (const ArrayType *AT = 3817 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3818 // Use array's original type only if it has known number of 3819 // elements. 3820 if (!isa<ConstantArrayType>(AT)) 3821 PType = PVDecl->getType(); 3822 } else if (PType->isFunctionType()) 3823 PType = PVDecl->getType(); 3824 // Process argument qualifiers for user supplied arguments; such as, 3825 // 'in', 'inout', etc. 3826 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3827 getObjCEncodingForType(PType, S); 3828 S += charUnitsToString(ParmOffset); 3829 ParmOffset += getObjCEncodingTypeSize(PType); 3830 } 3831} 3832 3833/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3834/// property declaration. If non-NULL, Container must be either an 3835/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3836/// NULL when getting encodings for protocol properties. 3837/// Property attributes are stored as a comma-delimited C string. The simple 3838/// attributes readonly and bycopy are encoded as single characters. The 3839/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3840/// encoded as single characters, followed by an identifier. Property types 3841/// are also encoded as a parametrized attribute. The characters used to encode 3842/// these attributes are defined by the following enumeration: 3843/// @code 3844/// enum PropertyAttributes { 3845/// kPropertyReadOnly = 'R', // property is read-only. 3846/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3847/// kPropertyByref = '&', // property is a reference to the value last assigned 3848/// kPropertyDynamic = 'D', // property is dynamic 3849/// kPropertyGetter = 'G', // followed by getter selector name 3850/// kPropertySetter = 'S', // followed by setter selector name 3851/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3852/// kPropertyType = 't' // followed by old-style type encoding. 3853/// kPropertyWeak = 'W' // 'weak' property 3854/// kPropertyStrong = 'P' // property GC'able 3855/// kPropertyNonAtomic = 'N' // property non-atomic 3856/// }; 3857/// @endcode 3858void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3859 const Decl *Container, 3860 std::string& S) const { 3861 // Collect information from the property implementation decl(s). 3862 bool Dynamic = false; 3863 ObjCPropertyImplDecl *SynthesizePID = 0; 3864 3865 // FIXME: Duplicated code due to poor abstraction. 3866 if (Container) { 3867 if (const ObjCCategoryImplDecl *CID = 3868 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3869 for (ObjCCategoryImplDecl::propimpl_iterator 3870 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3871 i != e; ++i) { 3872 ObjCPropertyImplDecl *PID = *i; 3873 if (PID->getPropertyDecl() == PD) { 3874 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3875 Dynamic = true; 3876 } else { 3877 SynthesizePID = PID; 3878 } 3879 } 3880 } 3881 } else { 3882 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3883 for (ObjCCategoryImplDecl::propimpl_iterator 3884 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3885 i != e; ++i) { 3886 ObjCPropertyImplDecl *PID = *i; 3887 if (PID->getPropertyDecl() == PD) { 3888 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3889 Dynamic = true; 3890 } else { 3891 SynthesizePID = PID; 3892 } 3893 } 3894 } 3895 } 3896 } 3897 3898 // FIXME: This is not very efficient. 3899 S = "T"; 3900 3901 // Encode result type. 3902 // GCC has some special rules regarding encoding of properties which 3903 // closely resembles encoding of ivars. 3904 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3905 true /* outermost type */, 3906 true /* encoding for property */); 3907 3908 if (PD->isReadOnly()) { 3909 S += ",R"; 3910 } else { 3911 switch (PD->getSetterKind()) { 3912 case ObjCPropertyDecl::Assign: break; 3913 case ObjCPropertyDecl::Copy: S += ",C"; break; 3914 case ObjCPropertyDecl::Retain: S += ",&"; break; 3915 } 3916 } 3917 3918 // It really isn't clear at all what this means, since properties 3919 // are "dynamic by default". 3920 if (Dynamic) 3921 S += ",D"; 3922 3923 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3924 S += ",N"; 3925 3926 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3927 S += ",G"; 3928 S += PD->getGetterName().getAsString(); 3929 } 3930 3931 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3932 S += ",S"; 3933 S += PD->getSetterName().getAsString(); 3934 } 3935 3936 if (SynthesizePID) { 3937 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3938 S += ",V"; 3939 S += OID->getNameAsString(); 3940 } 3941 3942 // FIXME: OBJCGC: weak & strong 3943} 3944 3945/// getLegacyIntegralTypeEncoding - 3946/// Another legacy compatibility encoding: 32-bit longs are encoded as 3947/// 'l' or 'L' , but not always. For typedefs, we need to use 3948/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3949/// 3950void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3951 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3952 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3953 if (BT->getKind() == BuiltinType::ULong && getIntWidth(PointeeTy) == 32) 3954 PointeeTy = UnsignedIntTy; 3955 else 3956 if (BT->getKind() == BuiltinType::Long && getIntWidth(PointeeTy) == 32) 3957 PointeeTy = IntTy; 3958 } 3959 } 3960} 3961 3962void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3963 const FieldDecl *Field) const { 3964 // We follow the behavior of gcc, expanding structures which are 3965 // directly pointed to, and expanding embedded structures. Note that 3966 // these rules are sufficient to prevent recursive encoding of the 3967 // same type. 3968 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3969 true /* outermost type */); 3970} 3971 3972static char ObjCEncodingForPrimitiveKind(const ASTContext *C, QualType T) { 3973 switch (T->getAs<BuiltinType>()->getKind()) { 3974 default: assert(0 && "Unhandled builtin type kind"); 3975 case BuiltinType::Void: return 'v'; 3976 case BuiltinType::Bool: return 'B'; 3977 case BuiltinType::Char_U: 3978 case BuiltinType::UChar: return 'C'; 3979 case BuiltinType::UShort: return 'S'; 3980 case BuiltinType::UInt: return 'I'; 3981 case BuiltinType::ULong: 3982 return C->getIntWidth(T) == 32 ? 'L' : 'Q'; 3983 case BuiltinType::UInt128: return 'T'; 3984 case BuiltinType::ULongLong: return 'Q'; 3985 case BuiltinType::Char_S: 3986 case BuiltinType::SChar: return 'c'; 3987 case BuiltinType::Short: return 's'; 3988 case BuiltinType::WChar_S: 3989 case BuiltinType::WChar_U: 3990 case BuiltinType::Int: return 'i'; 3991 case BuiltinType::Long: 3992 return C->getIntWidth(T) == 32 ? 'l' : 'q'; 3993 case BuiltinType::LongLong: return 'q'; 3994 case BuiltinType::Int128: return 't'; 3995 case BuiltinType::Float: return 'f'; 3996 case BuiltinType::Double: return 'd'; 3997 case BuiltinType::LongDouble: return 'D'; 3998 } 3999} 4000 4001static void EncodeBitField(const ASTContext *Ctx, std::string& S, 4002 QualType T, const FieldDecl *FD) { 4003 const Expr *E = FD->getBitWidth(); 4004 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 4005 S += 'b'; 4006 // The NeXT runtime encodes bit fields as b followed by the number of bits. 4007 // The GNU runtime requires more information; bitfields are encoded as b, 4008 // then the offset (in bits) of the first element, then the type of the 4009 // bitfield, then the size in bits. For example, in this structure: 4010 // 4011 // struct 4012 // { 4013 // int integer; 4014 // int flags:2; 4015 // }; 4016 // On a 32-bit system, the encoding for flags would be b2 for the NeXT 4017 // runtime, but b32i2 for the GNU runtime. The reason for this extra 4018 // information is not especially sensible, but we're stuck with it for 4019 // compatibility with GCC, although providing it breaks anything that 4020 // actually uses runtime introspection and wants to work on both runtimes... 4021 if (!Ctx->getLangOptions().NeXTRuntime) { 4022 const RecordDecl *RD = FD->getParent(); 4023 const ASTRecordLayout &RL = Ctx->getASTRecordLayout(RD); 4024 // FIXME: This same linear search is also used in ExprConstant - it might 4025 // be better if the FieldDecl stored its offset. We'd be increasing the 4026 // size of the object slightly, but saving some time every time it is used. 4027 unsigned i = 0; 4028 for (RecordDecl::field_iterator Field = RD->field_begin(), 4029 FieldEnd = RD->field_end(); 4030 Field != FieldEnd; (void)++Field, ++i) { 4031 if (*Field == FD) 4032 break; 4033 } 4034 S += llvm::utostr(RL.getFieldOffset(i)); 4035 if (T->isEnumeralType()) 4036 S += 'i'; 4037 else 4038 S += ObjCEncodingForPrimitiveKind(Ctx, T); 4039 } 4040 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 4041 S += llvm::utostr(N); 4042} 4043 4044// FIXME: Use SmallString for accumulating string. 4045void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 4046 bool ExpandPointedToStructures, 4047 bool ExpandStructures, 4048 const FieldDecl *FD, 4049 bool OutermostType, 4050 bool EncodingProperty) const { 4051 if (T->getAs<BuiltinType>()) { 4052 if (FD && FD->isBitField()) 4053 return EncodeBitField(this, S, T, FD); 4054 S += ObjCEncodingForPrimitiveKind(this, T); 4055 return; 4056 } 4057 4058 if (const ComplexType *CT = T->getAs<ComplexType>()) { 4059 S += 'j'; 4060 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 4061 false); 4062 return; 4063 } 4064 4065 // encoding for pointer or r3eference types. 4066 QualType PointeeTy; 4067 if (const PointerType *PT = T->getAs<PointerType>()) { 4068 if (PT->isObjCSelType()) { 4069 S += ':'; 4070 return; 4071 } 4072 PointeeTy = PT->getPointeeType(); 4073 } 4074 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 4075 PointeeTy = RT->getPointeeType(); 4076 if (!PointeeTy.isNull()) { 4077 bool isReadOnly = false; 4078 // For historical/compatibility reasons, the read-only qualifier of the 4079 // pointee gets emitted _before_ the '^'. The read-only qualifier of 4080 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 4081 // Also, do not emit the 'r' for anything but the outermost type! 4082 if (isa<TypedefType>(T.getTypePtr())) { 4083 if (OutermostType && T.isConstQualified()) { 4084 isReadOnly = true; 4085 S += 'r'; 4086 } 4087 } else if (OutermostType) { 4088 QualType P = PointeeTy; 4089 while (P->getAs<PointerType>()) 4090 P = P->getAs<PointerType>()->getPointeeType(); 4091 if (P.isConstQualified()) { 4092 isReadOnly = true; 4093 S += 'r'; 4094 } 4095 } 4096 if (isReadOnly) { 4097 // Another legacy compatibility encoding. Some ObjC qualifier and type 4098 // combinations need to be rearranged. 4099 // Rewrite "in const" from "nr" to "rn" 4100 if (llvm::StringRef(S).endswith("nr")) 4101 S.replace(S.end()-2, S.end(), "rn"); 4102 } 4103 4104 if (PointeeTy->isCharType()) { 4105 // char pointer types should be encoded as '*' unless it is a 4106 // type that has been typedef'd to 'BOOL'. 4107 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 4108 S += '*'; 4109 return; 4110 } 4111 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 4112 // GCC binary compat: Need to convert "struct objc_class *" to "#". 4113 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 4114 S += '#'; 4115 return; 4116 } 4117 // GCC binary compat: Need to convert "struct objc_object *" to "@". 4118 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 4119 S += '@'; 4120 return; 4121 } 4122 // fall through... 4123 } 4124 S += '^'; 4125 getLegacyIntegralTypeEncoding(PointeeTy); 4126 4127 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 4128 NULL); 4129 return; 4130 } 4131 4132 if (const ArrayType *AT = 4133 // Ignore type qualifiers etc. 4134 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 4135 if (isa<IncompleteArrayType>(AT)) { 4136 // Incomplete arrays are encoded as a pointer to the array element. 4137 S += '^'; 4138 4139 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4140 false, ExpandStructures, FD); 4141 } else { 4142 S += '['; 4143 4144 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 4145 S += llvm::utostr(CAT->getSize().getZExtValue()); 4146 else { 4147 //Variable length arrays are encoded as a regular array with 0 elements. 4148 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 4149 S += '0'; 4150 } 4151 4152 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4153 false, ExpandStructures, FD); 4154 S += ']'; 4155 } 4156 return; 4157 } 4158 4159 if (T->getAs<FunctionType>()) { 4160 S += '?'; 4161 return; 4162 } 4163 4164 if (const RecordType *RTy = T->getAs<RecordType>()) { 4165 RecordDecl *RDecl = RTy->getDecl(); 4166 S += RDecl->isUnion() ? '(' : '{'; 4167 // Anonymous structures print as '?' 4168 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 4169 S += II->getName(); 4170 if (ClassTemplateSpecializationDecl *Spec 4171 = dyn_cast<ClassTemplateSpecializationDecl>(RDecl)) { 4172 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 4173 std::string TemplateArgsStr 4174 = TemplateSpecializationType::PrintTemplateArgumentList( 4175 TemplateArgs.data(), 4176 TemplateArgs.size(), 4177 (*this).PrintingPolicy); 4178 4179 S += TemplateArgsStr; 4180 } 4181 } else { 4182 S += '?'; 4183 } 4184 if (ExpandStructures) { 4185 S += '='; 4186 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 4187 FieldEnd = RDecl->field_end(); 4188 Field != FieldEnd; ++Field) { 4189 if (FD) { 4190 S += '"'; 4191 S += Field->getNameAsString(); 4192 S += '"'; 4193 } 4194 4195 // Special case bit-fields. 4196 if (Field->isBitField()) { 4197 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 4198 (*Field)); 4199 } else { 4200 QualType qt = Field->getType(); 4201 getLegacyIntegralTypeEncoding(qt); 4202 getObjCEncodingForTypeImpl(qt, S, false, true, 4203 FD); 4204 } 4205 } 4206 } 4207 S += RDecl->isUnion() ? ')' : '}'; 4208 return; 4209 } 4210 4211 if (T->isEnumeralType()) { 4212 if (FD && FD->isBitField()) 4213 EncodeBitField(this, S, T, FD); 4214 else 4215 S += 'i'; 4216 return; 4217 } 4218 4219 if (T->isBlockPointerType()) { 4220 S += "@?"; // Unlike a pointer-to-function, which is "^?". 4221 return; 4222 } 4223 4224 // Ignore protocol qualifiers when mangling at this level. 4225 if (const ObjCObjectType *OT = T->getAs<ObjCObjectType>()) 4226 T = OT->getBaseType(); 4227 4228 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 4229 // @encode(class_name) 4230 ObjCInterfaceDecl *OI = OIT->getDecl(); 4231 S += '{'; 4232 const IdentifierInfo *II = OI->getIdentifier(); 4233 S += II->getName(); 4234 S += '='; 4235 llvm::SmallVector<ObjCIvarDecl*, 32> Ivars; 4236 DeepCollectObjCIvars(OI, true, Ivars); 4237 for (unsigned i = 0, e = Ivars.size(); i != e; ++i) { 4238 FieldDecl *Field = cast<FieldDecl>(Ivars[i]); 4239 if (Field->isBitField()) 4240 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, Field); 4241 else 4242 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, FD); 4243 } 4244 S += '}'; 4245 return; 4246 } 4247 4248 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 4249 if (OPT->isObjCIdType()) { 4250 S += '@'; 4251 return; 4252 } 4253 4254 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 4255 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 4256 // Since this is a binary compatibility issue, need to consult with runtime 4257 // folks. Fortunately, this is a *very* obsure construct. 4258 S += '#'; 4259 return; 4260 } 4261 4262 if (OPT->isObjCQualifiedIdType()) { 4263 getObjCEncodingForTypeImpl(getObjCIdType(), S, 4264 ExpandPointedToStructures, 4265 ExpandStructures, FD); 4266 if (FD || EncodingProperty) { 4267 // Note that we do extended encoding of protocol qualifer list 4268 // Only when doing ivar or property encoding. 4269 S += '"'; 4270 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4271 E = OPT->qual_end(); I != E; ++I) { 4272 S += '<'; 4273 S += (*I)->getNameAsString(); 4274 S += '>'; 4275 } 4276 S += '"'; 4277 } 4278 return; 4279 } 4280 4281 QualType PointeeTy = OPT->getPointeeType(); 4282 if (!EncodingProperty && 4283 isa<TypedefType>(PointeeTy.getTypePtr())) { 4284 // Another historical/compatibility reason. 4285 // We encode the underlying type which comes out as 4286 // {...}; 4287 S += '^'; 4288 getObjCEncodingForTypeImpl(PointeeTy, S, 4289 false, ExpandPointedToStructures, 4290 NULL); 4291 return; 4292 } 4293 4294 S += '@'; 4295 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 4296 S += '"'; 4297 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 4298 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4299 E = OPT->qual_end(); I != E; ++I) { 4300 S += '<'; 4301 S += (*I)->getNameAsString(); 4302 S += '>'; 4303 } 4304 S += '"'; 4305 } 4306 return; 4307 } 4308 4309 // gcc just blithely ignores member pointers. 4310 // TODO: maybe there should be a mangling for these 4311 if (T->getAs<MemberPointerType>()) 4312 return; 4313 4314 if (T->isVectorType()) { 4315 // This matches gcc's encoding, even though technically it is 4316 // insufficient. 4317 // FIXME. We should do a better job than gcc. 4318 return; 4319 } 4320 4321 assert(0 && "@encode for type not implemented!"); 4322} 4323 4324void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 4325 std::string& S) const { 4326 if (QT & Decl::OBJC_TQ_In) 4327 S += 'n'; 4328 if (QT & Decl::OBJC_TQ_Inout) 4329 S += 'N'; 4330 if (QT & Decl::OBJC_TQ_Out) 4331 S += 'o'; 4332 if (QT & Decl::OBJC_TQ_Bycopy) 4333 S += 'O'; 4334 if (QT & Decl::OBJC_TQ_Byref) 4335 S += 'R'; 4336 if (QT & Decl::OBJC_TQ_Oneway) 4337 S += 'V'; 4338} 4339 4340void ASTContext::setBuiltinVaListType(QualType T) { 4341 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 4342 4343 BuiltinVaListType = T; 4344} 4345 4346void ASTContext::setObjCIdType(QualType T) { 4347 ObjCIdTypedefType = T; 4348} 4349 4350void ASTContext::setObjCSelType(QualType T) { 4351 ObjCSelTypedefType = T; 4352} 4353 4354void ASTContext::setObjCProtoType(QualType QT) { 4355 ObjCProtoType = QT; 4356} 4357 4358void ASTContext::setObjCClassType(QualType T) { 4359 ObjCClassTypedefType = T; 4360} 4361 4362void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 4363 assert(ObjCConstantStringType.isNull() && 4364 "'NSConstantString' type already set!"); 4365 4366 ObjCConstantStringType = getObjCInterfaceType(Decl); 4367} 4368 4369/// \brief Retrieve the template name that corresponds to a non-empty 4370/// lookup. 4371TemplateName 4372ASTContext::getOverloadedTemplateName(UnresolvedSetIterator Begin, 4373 UnresolvedSetIterator End) const { 4374 unsigned size = End - Begin; 4375 assert(size > 1 && "set is not overloaded!"); 4376 4377 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 4378 size * sizeof(FunctionTemplateDecl*)); 4379 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 4380 4381 NamedDecl **Storage = OT->getStorage(); 4382 for (UnresolvedSetIterator I = Begin; I != End; ++I) { 4383 NamedDecl *D = *I; 4384 assert(isa<FunctionTemplateDecl>(D) || 4385 (isa<UsingShadowDecl>(D) && 4386 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 4387 *Storage++ = D; 4388 } 4389 4390 return TemplateName(OT); 4391} 4392 4393/// \brief Retrieve the template name that represents a qualified 4394/// template name such as \c std::vector. 4395TemplateName 4396ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 4397 bool TemplateKeyword, 4398 TemplateDecl *Template) const { 4399 assert(NNS && "Missing nested-name-specifier in qualified template name"); 4400 4401 // FIXME: Canonicalization? 4402 llvm::FoldingSetNodeID ID; 4403 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 4404 4405 void *InsertPos = 0; 4406 QualifiedTemplateName *QTN = 4407 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4408 if (!QTN) { 4409 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 4410 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 4411 } 4412 4413 return TemplateName(QTN); 4414} 4415 4416/// \brief Retrieve the template name that represents a dependent 4417/// template name such as \c MetaFun::template apply. 4418TemplateName 4419ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4420 const IdentifierInfo *Name) const { 4421 assert((!NNS || NNS->isDependent()) && 4422 "Nested name specifier must be dependent"); 4423 4424 llvm::FoldingSetNodeID ID; 4425 DependentTemplateName::Profile(ID, NNS, Name); 4426 4427 void *InsertPos = 0; 4428 DependentTemplateName *QTN = 4429 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4430 4431 if (QTN) 4432 return TemplateName(QTN); 4433 4434 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4435 if (CanonNNS == NNS) { 4436 QTN = new (*this,4) DependentTemplateName(NNS, Name); 4437 } else { 4438 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 4439 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 4440 DependentTemplateName *CheckQTN = 4441 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4442 assert(!CheckQTN && "Dependent type name canonicalization broken"); 4443 (void)CheckQTN; 4444 } 4445 4446 DependentTemplateNames.InsertNode(QTN, InsertPos); 4447 return TemplateName(QTN); 4448} 4449 4450/// \brief Retrieve the template name that represents a dependent 4451/// template name such as \c MetaFun::template operator+. 4452TemplateName 4453ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4454 OverloadedOperatorKind Operator) const { 4455 assert((!NNS || NNS->isDependent()) && 4456 "Nested name specifier must be dependent"); 4457 4458 llvm::FoldingSetNodeID ID; 4459 DependentTemplateName::Profile(ID, NNS, Operator); 4460 4461 void *InsertPos = 0; 4462 DependentTemplateName *QTN 4463 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4464 4465 if (QTN) 4466 return TemplateName(QTN); 4467 4468 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4469 if (CanonNNS == NNS) { 4470 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 4471 } else { 4472 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 4473 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 4474 4475 DependentTemplateName *CheckQTN 4476 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4477 assert(!CheckQTN && "Dependent template name canonicalization broken"); 4478 (void)CheckQTN; 4479 } 4480 4481 DependentTemplateNames.InsertNode(QTN, InsertPos); 4482 return TemplateName(QTN); 4483} 4484 4485TemplateName 4486ASTContext::getSubstTemplateTemplateParmPack(TemplateTemplateParmDecl *Param, 4487 const TemplateArgument &ArgPack) const { 4488 ASTContext &Self = const_cast<ASTContext &>(*this); 4489 llvm::FoldingSetNodeID ID; 4490 SubstTemplateTemplateParmPackStorage::Profile(ID, Self, Param, ArgPack); 4491 4492 void *InsertPos = 0; 4493 SubstTemplateTemplateParmPackStorage *Subst 4494 = SubstTemplateTemplateParmPacks.FindNodeOrInsertPos(ID, InsertPos); 4495 4496 if (!Subst) { 4497 Subst = new (*this) SubstTemplateTemplateParmPackStorage(Self, Param, 4498 ArgPack.pack_size(), 4499 ArgPack.pack_begin()); 4500 SubstTemplateTemplateParmPacks.InsertNode(Subst, InsertPos); 4501 } 4502 4503 return TemplateName(Subst); 4504} 4505 4506/// getFromTargetType - Given one of the integer types provided by 4507/// TargetInfo, produce the corresponding type. The unsigned @p Type 4508/// is actually a value of type @c TargetInfo::IntType. 4509CanQualType ASTContext::getFromTargetType(unsigned Type) const { 4510 switch (Type) { 4511 case TargetInfo::NoInt: return CanQualType(); 4512 case TargetInfo::SignedShort: return ShortTy; 4513 case TargetInfo::UnsignedShort: return UnsignedShortTy; 4514 case TargetInfo::SignedInt: return IntTy; 4515 case TargetInfo::UnsignedInt: return UnsignedIntTy; 4516 case TargetInfo::SignedLong: return LongTy; 4517 case TargetInfo::UnsignedLong: return UnsignedLongTy; 4518 case TargetInfo::SignedLongLong: return LongLongTy; 4519 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 4520 } 4521 4522 assert(false && "Unhandled TargetInfo::IntType value"); 4523 return CanQualType(); 4524} 4525 4526//===----------------------------------------------------------------------===// 4527// Type Predicates. 4528//===----------------------------------------------------------------------===// 4529 4530/// isObjCNSObjectType - Return true if this is an NSObject object using 4531/// NSObject attribute on a c-style pointer type. 4532/// FIXME - Make it work directly on types. 4533/// FIXME: Move to Type. 4534/// 4535bool ASTContext::isObjCNSObjectType(QualType Ty) const { 4536 if (const TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 4537 if (TypedefDecl *TD = TDT->getDecl()) 4538 if (TD->getAttr<ObjCNSObjectAttr>()) 4539 return true; 4540 } 4541 return false; 4542} 4543 4544/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 4545/// garbage collection attribute. 4546/// 4547Qualifiers::GC ASTContext::getObjCGCAttrKind(QualType Ty) const { 4548 if (getLangOptions().getGCMode() == LangOptions::NonGC) 4549 return Qualifiers::GCNone; 4550 4551 assert(getLangOptions().ObjC1); 4552 Qualifiers::GC GCAttrs = Ty.getObjCGCAttr(); 4553 4554 // Default behaviour under objective-C's gc is for ObjC pointers 4555 // (or pointers to them) be treated as though they were declared 4556 // as __strong. 4557 if (GCAttrs == Qualifiers::GCNone) { 4558 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 4559 return Qualifiers::Strong; 4560 else if (Ty->isPointerType()) 4561 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 4562 } else { 4563 // It's not valid to set GC attributes on anything that isn't a 4564 // pointer. 4565#ifndef NDEBUG 4566 QualType CT = Ty->getCanonicalTypeInternal(); 4567 while (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 4568 CT = AT->getElementType(); 4569 assert(CT->isAnyPointerType() || CT->isBlockPointerType()); 4570#endif 4571 } 4572 return GCAttrs; 4573} 4574 4575//===----------------------------------------------------------------------===// 4576// Type Compatibility Testing 4577//===----------------------------------------------------------------------===// 4578 4579/// areCompatVectorTypes - Return true if the two specified vector types are 4580/// compatible. 4581static bool areCompatVectorTypes(const VectorType *LHS, 4582 const VectorType *RHS) { 4583 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 4584 return LHS->getElementType() == RHS->getElementType() && 4585 LHS->getNumElements() == RHS->getNumElements(); 4586} 4587 4588bool ASTContext::areCompatibleVectorTypes(QualType FirstVec, 4589 QualType SecondVec) { 4590 assert(FirstVec->isVectorType() && "FirstVec should be a vector type"); 4591 assert(SecondVec->isVectorType() && "SecondVec should be a vector type"); 4592 4593 if (hasSameUnqualifiedType(FirstVec, SecondVec)) 4594 return true; 4595 4596 // Treat Neon vector types and most AltiVec vector types as if they are the 4597 // equivalent GCC vector types. 4598 const VectorType *First = FirstVec->getAs<VectorType>(); 4599 const VectorType *Second = SecondVec->getAs<VectorType>(); 4600 if (First->getNumElements() == Second->getNumElements() && 4601 hasSameType(First->getElementType(), Second->getElementType()) && 4602 First->getVectorKind() != VectorType::AltiVecPixel && 4603 First->getVectorKind() != VectorType::AltiVecBool && 4604 Second->getVectorKind() != VectorType::AltiVecPixel && 4605 Second->getVectorKind() != VectorType::AltiVecBool) 4606 return true; 4607 4608 return false; 4609} 4610 4611//===----------------------------------------------------------------------===// 4612// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 4613//===----------------------------------------------------------------------===// 4614 4615/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 4616/// inheritance hierarchy of 'rProto'. 4617bool 4618ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 4619 ObjCProtocolDecl *rProto) const { 4620 if (lProto == rProto) 4621 return true; 4622 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 4623 E = rProto->protocol_end(); PI != E; ++PI) 4624 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 4625 return true; 4626 return false; 4627} 4628 4629/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 4630/// return true if lhs's protocols conform to rhs's protocol; false 4631/// otherwise. 4632bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 4633 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 4634 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 4635 return false; 4636} 4637 4638/// ObjCQualifiedClassTypesAreCompatible - compare Class<p,...> and 4639/// Class<p1, ...>. 4640bool ASTContext::ObjCQualifiedClassTypesAreCompatible(QualType lhs, 4641 QualType rhs) { 4642 const ObjCObjectPointerType *lhsQID = lhs->getAs<ObjCObjectPointerType>(); 4643 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4644 assert ((lhsQID && rhsOPT) && "ObjCQualifiedClassTypesAreCompatible"); 4645 4646 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4647 E = lhsQID->qual_end(); I != E; ++I) { 4648 bool match = false; 4649 ObjCProtocolDecl *lhsProto = *I; 4650 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4651 E = rhsOPT->qual_end(); J != E; ++J) { 4652 ObjCProtocolDecl *rhsProto = *J; 4653 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto)) { 4654 match = true; 4655 break; 4656 } 4657 } 4658 if (!match) 4659 return false; 4660 } 4661 return true; 4662} 4663 4664/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 4665/// ObjCQualifiedIDType. 4666bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 4667 bool compare) { 4668 // Allow id<P..> and an 'id' or void* type in all cases. 4669 if (lhs->isVoidPointerType() || 4670 lhs->isObjCIdType() || lhs->isObjCClassType()) 4671 return true; 4672 else if (rhs->isVoidPointerType() || 4673 rhs->isObjCIdType() || rhs->isObjCClassType()) 4674 return true; 4675 4676 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 4677 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4678 4679 if (!rhsOPT) return false; 4680 4681 if (rhsOPT->qual_empty()) { 4682 // If the RHS is a unqualified interface pointer "NSString*", 4683 // make sure we check the class hierarchy. 4684 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4685 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4686 E = lhsQID->qual_end(); I != E; ++I) { 4687 // when comparing an id<P> on lhs with a static type on rhs, 4688 // see if static class implements all of id's protocols, directly or 4689 // through its super class and categories. 4690 if (!rhsID->ClassImplementsProtocol(*I, true)) 4691 return false; 4692 } 4693 } 4694 // If there are no qualifiers and no interface, we have an 'id'. 4695 return true; 4696 } 4697 // Both the right and left sides have qualifiers. 4698 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4699 E = lhsQID->qual_end(); I != E; ++I) { 4700 ObjCProtocolDecl *lhsProto = *I; 4701 bool match = false; 4702 4703 // when comparing an id<P> on lhs with a static type on rhs, 4704 // see if static class implements all of id's protocols, directly or 4705 // through its super class and categories. 4706 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4707 E = rhsOPT->qual_end(); J != E; ++J) { 4708 ObjCProtocolDecl *rhsProto = *J; 4709 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4710 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4711 match = true; 4712 break; 4713 } 4714 } 4715 // If the RHS is a qualified interface pointer "NSString<P>*", 4716 // make sure we check the class hierarchy. 4717 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4718 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4719 E = lhsQID->qual_end(); I != E; ++I) { 4720 // when comparing an id<P> on lhs with a static type on rhs, 4721 // see if static class implements all of id's protocols, directly or 4722 // through its super class and categories. 4723 if (rhsID->ClassImplementsProtocol(*I, true)) { 4724 match = true; 4725 break; 4726 } 4727 } 4728 } 4729 if (!match) 4730 return false; 4731 } 4732 4733 return true; 4734 } 4735 4736 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 4737 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 4738 4739 if (const ObjCObjectPointerType *lhsOPT = 4740 lhs->getAsObjCInterfacePointerType()) { 4741 // If both the right and left sides have qualifiers. 4742 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 4743 E = lhsOPT->qual_end(); I != E; ++I) { 4744 ObjCProtocolDecl *lhsProto = *I; 4745 bool match = false; 4746 4747 // when comparing an id<P> on rhs with a static type on lhs, 4748 // see if static class implements all of id's protocols, directly or 4749 // through its super class and categories. 4750 // First, lhs protocols in the qualifier list must be found, direct 4751 // or indirect in rhs's qualifier list or it is a mismatch. 4752 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4753 E = rhsQID->qual_end(); J != E; ++J) { 4754 ObjCProtocolDecl *rhsProto = *J; 4755 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4756 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4757 match = true; 4758 break; 4759 } 4760 } 4761 if (!match) 4762 return false; 4763 } 4764 4765 // Static class's protocols, or its super class or category protocols 4766 // must be found, direct or indirect in rhs's qualifier list or it is a mismatch. 4767 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 4768 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4769 CollectInheritedProtocols(lhsID, LHSInheritedProtocols); 4770 // This is rather dubious but matches gcc's behavior. If lhs has 4771 // no type qualifier and its class has no static protocol(s) 4772 // assume that it is mismatch. 4773 if (LHSInheritedProtocols.empty() && lhsOPT->qual_empty()) 4774 return false; 4775 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4776 LHSInheritedProtocols.begin(), 4777 E = LHSInheritedProtocols.end(); I != E; ++I) { 4778 bool match = false; 4779 ObjCProtocolDecl *lhsProto = (*I); 4780 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4781 E = rhsQID->qual_end(); J != E; ++J) { 4782 ObjCProtocolDecl *rhsProto = *J; 4783 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4784 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4785 match = true; 4786 break; 4787 } 4788 } 4789 if (!match) 4790 return false; 4791 } 4792 } 4793 return true; 4794 } 4795 return false; 4796} 4797 4798/// canAssignObjCInterfaces - Return true if the two interface types are 4799/// compatible for assignment from RHS to LHS. This handles validation of any 4800/// protocol qualifiers on the LHS or RHS. 4801/// 4802bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4803 const ObjCObjectPointerType *RHSOPT) { 4804 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4805 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4806 4807 // If either type represents the built-in 'id' or 'Class' types, return true. 4808 if (LHS->isObjCUnqualifiedIdOrClass() || 4809 RHS->isObjCUnqualifiedIdOrClass()) 4810 return true; 4811 4812 if (LHS->isObjCQualifiedId() || RHS->isObjCQualifiedId()) 4813 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4814 QualType(RHSOPT,0), 4815 false); 4816 4817 if (LHS->isObjCQualifiedClass() && RHS->isObjCQualifiedClass()) 4818 return ObjCQualifiedClassTypesAreCompatible(QualType(LHSOPT,0), 4819 QualType(RHSOPT,0)); 4820 4821 // If we have 2 user-defined types, fall into that path. 4822 if (LHS->getInterface() && RHS->getInterface()) 4823 return canAssignObjCInterfaces(LHS, RHS); 4824 4825 return false; 4826} 4827 4828/// canAssignObjCInterfacesInBlockPointer - This routine is specifically written 4829/// for providing type-safty for objective-c pointers used to pass/return 4830/// arguments in block literals. When passed as arguments, passing 'A*' where 4831/// 'id' is expected is not OK. Passing 'Sub *" where 'Super *" is expected is 4832/// not OK. For the return type, the opposite is not OK. 4833bool ASTContext::canAssignObjCInterfacesInBlockPointer( 4834 const ObjCObjectPointerType *LHSOPT, 4835 const ObjCObjectPointerType *RHSOPT) { 4836 if (RHSOPT->isObjCBuiltinType() || LHSOPT->isObjCIdType()) 4837 return true; 4838 4839 if (LHSOPT->isObjCBuiltinType()) { 4840 return RHSOPT->isObjCBuiltinType() || RHSOPT->isObjCQualifiedIdType(); 4841 } 4842 4843 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4844 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4845 QualType(RHSOPT,0), 4846 false); 4847 4848 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4849 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4850 if (LHS && RHS) { // We have 2 user-defined types. 4851 if (LHS != RHS) { 4852 if (LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4853 return false; 4854 if (RHS->getDecl()->isSuperClassOf(LHS->getDecl())) 4855 return true; 4856 } 4857 else 4858 return true; 4859 } 4860 return false; 4861} 4862 4863/// getIntersectionOfProtocols - This routine finds the intersection of set 4864/// of protocols inherited from two distinct objective-c pointer objects. 4865/// It is used to build composite qualifier list of the composite type of 4866/// the conditional expression involving two objective-c pointer objects. 4867static 4868void getIntersectionOfProtocols(ASTContext &Context, 4869 const ObjCObjectPointerType *LHSOPT, 4870 const ObjCObjectPointerType *RHSOPT, 4871 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4872 4873 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4874 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4875 assert(LHS->getInterface() && "LHS must have an interface base"); 4876 assert(RHS->getInterface() && "RHS must have an interface base"); 4877 4878 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4879 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4880 if (LHSNumProtocols > 0) 4881 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4882 else { 4883 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4884 Context.CollectInheritedProtocols(LHS->getInterface(), 4885 LHSInheritedProtocols); 4886 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4887 LHSInheritedProtocols.end()); 4888 } 4889 4890 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4891 if (RHSNumProtocols > 0) { 4892 ObjCProtocolDecl **RHSProtocols = 4893 const_cast<ObjCProtocolDecl **>(RHS->qual_begin()); 4894 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4895 if (InheritedProtocolSet.count(RHSProtocols[i])) 4896 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4897 } 4898 else { 4899 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4900 Context.CollectInheritedProtocols(RHS->getInterface(), 4901 RHSInheritedProtocols); 4902 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4903 RHSInheritedProtocols.begin(), 4904 E = RHSInheritedProtocols.end(); I != E; ++I) 4905 if (InheritedProtocolSet.count((*I))) 4906 IntersectionOfProtocols.push_back((*I)); 4907 } 4908} 4909 4910/// areCommonBaseCompatible - Returns common base class of the two classes if 4911/// one found. Note that this is O'2 algorithm. But it will be called as the 4912/// last type comparison in a ?-exp of ObjC pointer types before a 4913/// warning is issued. So, its invokation is extremely rare. 4914QualType ASTContext::areCommonBaseCompatible( 4915 const ObjCObjectPointerType *Lptr, 4916 const ObjCObjectPointerType *Rptr) { 4917 const ObjCObjectType *LHS = Lptr->getObjectType(); 4918 const ObjCObjectType *RHS = Rptr->getObjectType(); 4919 const ObjCInterfaceDecl* LDecl = LHS->getInterface(); 4920 const ObjCInterfaceDecl* RDecl = RHS->getInterface(); 4921 if (!LDecl || !RDecl) 4922 return QualType(); 4923 4924 while ((LDecl = LDecl->getSuperClass())) { 4925 LHS = cast<ObjCInterfaceType>(getObjCInterfaceType(LDecl)); 4926 if (canAssignObjCInterfaces(LHS, RHS)) { 4927 llvm::SmallVector<ObjCProtocolDecl *, 8> Protocols; 4928 getIntersectionOfProtocols(*this, Lptr, Rptr, Protocols); 4929 4930 QualType Result = QualType(LHS, 0); 4931 if (!Protocols.empty()) 4932 Result = getObjCObjectType(Result, Protocols.data(), Protocols.size()); 4933 Result = getObjCObjectPointerType(Result); 4934 return Result; 4935 } 4936 } 4937 4938 return QualType(); 4939} 4940 4941bool ASTContext::canAssignObjCInterfaces(const ObjCObjectType *LHS, 4942 const ObjCObjectType *RHS) { 4943 assert(LHS->getInterface() && "LHS is not an interface type"); 4944 assert(RHS->getInterface() && "RHS is not an interface type"); 4945 4946 // Verify that the base decls are compatible: the RHS must be a subclass of 4947 // the LHS. 4948 if (!LHS->getInterface()->isSuperClassOf(RHS->getInterface())) 4949 return false; 4950 4951 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4952 // protocol qualified at all, then we are good. 4953 if (LHS->getNumProtocols() == 0) 4954 return true; 4955 4956 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4957 // isn't a superset. 4958 if (RHS->getNumProtocols() == 0) 4959 return true; // FIXME: should return false! 4960 4961 for (ObjCObjectType::qual_iterator LHSPI = LHS->qual_begin(), 4962 LHSPE = LHS->qual_end(); 4963 LHSPI != LHSPE; LHSPI++) { 4964 bool RHSImplementsProtocol = false; 4965 4966 // If the RHS doesn't implement the protocol on the left, the types 4967 // are incompatible. 4968 for (ObjCObjectType::qual_iterator RHSPI = RHS->qual_begin(), 4969 RHSPE = RHS->qual_end(); 4970 RHSPI != RHSPE; RHSPI++) { 4971 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4972 RHSImplementsProtocol = true; 4973 break; 4974 } 4975 } 4976 // FIXME: For better diagnostics, consider passing back the protocol name. 4977 if (!RHSImplementsProtocol) 4978 return false; 4979 } 4980 // The RHS implements all protocols listed on the LHS. 4981 return true; 4982} 4983 4984bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4985 // get the "pointed to" types 4986 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4987 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4988 4989 if (!LHSOPT || !RHSOPT) 4990 return false; 4991 4992 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4993 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4994} 4995 4996bool ASTContext::canBindObjCObjectType(QualType To, QualType From) { 4997 return canAssignObjCInterfaces( 4998 getObjCObjectPointerType(To)->getAs<ObjCObjectPointerType>(), 4999 getObjCObjectPointerType(From)->getAs<ObjCObjectPointerType>()); 5000} 5001 5002/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 5003/// both shall have the identically qualified version of a compatible type. 5004/// C99 6.2.7p1: Two types have compatible types if their types are the 5005/// same. See 6.7.[2,3,5] for additional rules. 5006bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS, 5007 bool CompareUnqualified) { 5008 if (getLangOptions().CPlusPlus) 5009 return hasSameType(LHS, RHS); 5010 5011 return !mergeTypes(LHS, RHS, false, CompareUnqualified).isNull(); 5012} 5013 5014bool ASTContext::typesAreBlockPointerCompatible(QualType LHS, QualType RHS) { 5015 return !mergeTypes(LHS, RHS, true).isNull(); 5016} 5017 5018/// mergeTransparentUnionType - if T is a transparent union type and a member 5019/// of T is compatible with SubType, return the merged type, else return 5020/// QualType() 5021QualType ASTContext::mergeTransparentUnionType(QualType T, QualType SubType, 5022 bool OfBlockPointer, 5023 bool Unqualified) { 5024 if (const RecordType *UT = T->getAsUnionType()) { 5025 RecordDecl *UD = UT->getDecl(); 5026 if (UD->hasAttr<TransparentUnionAttr>()) { 5027 for (RecordDecl::field_iterator it = UD->field_begin(), 5028 itend = UD->field_end(); it != itend; ++it) { 5029 QualType ET = it->getType().getUnqualifiedType(); 5030 QualType MT = mergeTypes(ET, SubType, OfBlockPointer, Unqualified); 5031 if (!MT.isNull()) 5032 return MT; 5033 } 5034 } 5035 } 5036 5037 return QualType(); 5038} 5039 5040/// mergeFunctionArgumentTypes - merge two types which appear as function 5041/// argument types 5042QualType ASTContext::mergeFunctionArgumentTypes(QualType lhs, QualType rhs, 5043 bool OfBlockPointer, 5044 bool Unqualified) { 5045 // GNU extension: two types are compatible if they appear as a function 5046 // argument, one of the types is a transparent union type and the other 5047 // type is compatible with a union member 5048 QualType lmerge = mergeTransparentUnionType(lhs, rhs, OfBlockPointer, 5049 Unqualified); 5050 if (!lmerge.isNull()) 5051 return lmerge; 5052 5053 QualType rmerge = mergeTransparentUnionType(rhs, lhs, OfBlockPointer, 5054 Unqualified); 5055 if (!rmerge.isNull()) 5056 return rmerge; 5057 5058 return mergeTypes(lhs, rhs, OfBlockPointer, Unqualified); 5059} 5060 5061QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs, 5062 bool OfBlockPointer, 5063 bool Unqualified) { 5064 const FunctionType *lbase = lhs->getAs<FunctionType>(); 5065 const FunctionType *rbase = rhs->getAs<FunctionType>(); 5066 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 5067 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 5068 bool allLTypes = true; 5069 bool allRTypes = true; 5070 5071 // Check return type 5072 QualType retType; 5073 if (OfBlockPointer) { 5074 QualType RHS = rbase->getResultType(); 5075 QualType LHS = lbase->getResultType(); 5076 bool UnqualifiedResult = Unqualified; 5077 if (!UnqualifiedResult) 5078 UnqualifiedResult = (!RHS.hasQualifiers() && LHS.hasQualifiers()); 5079 retType = mergeTypes(RHS, LHS, true, UnqualifiedResult); 5080 } 5081 else 5082 retType = mergeTypes(lbase->getResultType(), rbase->getResultType(), false, 5083 Unqualified); 5084 if (retType.isNull()) return QualType(); 5085 5086 if (Unqualified) 5087 retType = retType.getUnqualifiedType(); 5088 5089 CanQualType LRetType = getCanonicalType(lbase->getResultType()); 5090 CanQualType RRetType = getCanonicalType(rbase->getResultType()); 5091 if (Unqualified) { 5092 LRetType = LRetType.getUnqualifiedType(); 5093 RRetType = RRetType.getUnqualifiedType(); 5094 } 5095 5096 if (getCanonicalType(retType) != LRetType) 5097 allLTypes = false; 5098 if (getCanonicalType(retType) != RRetType) 5099 allRTypes = false; 5100 5101 // FIXME: double check this 5102 // FIXME: should we error if lbase->getRegParmAttr() != 0 && 5103 // rbase->getRegParmAttr() != 0 && 5104 // lbase->getRegParmAttr() != rbase->getRegParmAttr()? 5105 FunctionType::ExtInfo lbaseInfo = lbase->getExtInfo(); 5106 FunctionType::ExtInfo rbaseInfo = rbase->getExtInfo(); 5107 5108 // Compatible functions must have compatible calling conventions 5109 if (!isSameCallConv(lbaseInfo.getCC(), rbaseInfo.getCC())) 5110 return QualType(); 5111 5112 // Regparm is part of the calling convention. 5113 if (lbaseInfo.getRegParm() != rbaseInfo.getRegParm()) 5114 return QualType(); 5115 5116 // It's noreturn if either type is. 5117 // FIXME: some uses, e.g. conditional exprs, really want this to be 'both'. 5118 bool NoReturn = lbaseInfo.getNoReturn() || rbaseInfo.getNoReturn(); 5119 if (NoReturn != lbaseInfo.getNoReturn()) 5120 allLTypes = false; 5121 if (NoReturn != rbaseInfo.getNoReturn()) 5122 allRTypes = false; 5123 5124 FunctionType::ExtInfo einfo(NoReturn, 5125 lbaseInfo.getRegParm(), 5126 lbaseInfo.getCC()); 5127 5128 if (lproto && rproto) { // two C99 style function prototypes 5129 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 5130 "C++ shouldn't be here"); 5131 unsigned lproto_nargs = lproto->getNumArgs(); 5132 unsigned rproto_nargs = rproto->getNumArgs(); 5133 5134 // Compatible functions must have the same number of arguments 5135 if (lproto_nargs != rproto_nargs) 5136 return QualType(); 5137 5138 // Variadic and non-variadic functions aren't compatible 5139 if (lproto->isVariadic() != rproto->isVariadic()) 5140 return QualType(); 5141 5142 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 5143 return QualType(); 5144 5145 // Check argument compatibility 5146 llvm::SmallVector<QualType, 10> types; 5147 for (unsigned i = 0; i < lproto_nargs; i++) { 5148 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 5149 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 5150 QualType argtype = mergeFunctionArgumentTypes(largtype, rargtype, 5151 OfBlockPointer, 5152 Unqualified); 5153 if (argtype.isNull()) return QualType(); 5154 5155 if (Unqualified) 5156 argtype = argtype.getUnqualifiedType(); 5157 5158 types.push_back(argtype); 5159 if (Unqualified) { 5160 largtype = largtype.getUnqualifiedType(); 5161 rargtype = rargtype.getUnqualifiedType(); 5162 } 5163 5164 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 5165 allLTypes = false; 5166 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 5167 allRTypes = false; 5168 } 5169 if (allLTypes) return lhs; 5170 if (allRTypes) return rhs; 5171 5172 FunctionProtoType::ExtProtoInfo EPI = lproto->getExtProtoInfo(); 5173 EPI.ExtInfo = einfo; 5174 return getFunctionType(retType, types.begin(), types.size(), EPI); 5175 } 5176 5177 if (lproto) allRTypes = false; 5178 if (rproto) allLTypes = false; 5179 5180 const FunctionProtoType *proto = lproto ? lproto : rproto; 5181 if (proto) { 5182 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 5183 if (proto->isVariadic()) return QualType(); 5184 // Check that the types are compatible with the types that 5185 // would result from default argument promotions (C99 6.7.5.3p15). 5186 // The only types actually affected are promotable integer 5187 // types and floats, which would be passed as a different 5188 // type depending on whether the prototype is visible. 5189 unsigned proto_nargs = proto->getNumArgs(); 5190 for (unsigned i = 0; i < proto_nargs; ++i) { 5191 QualType argTy = proto->getArgType(i); 5192 5193 // Look at the promotion type of enum types, since that is the type used 5194 // to pass enum values. 5195 if (const EnumType *Enum = argTy->getAs<EnumType>()) 5196 argTy = Enum->getDecl()->getPromotionType(); 5197 5198 if (argTy->isPromotableIntegerType() || 5199 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 5200 return QualType(); 5201 } 5202 5203 if (allLTypes) return lhs; 5204 if (allRTypes) return rhs; 5205 5206 FunctionProtoType::ExtProtoInfo EPI = proto->getExtProtoInfo(); 5207 EPI.ExtInfo = einfo; 5208 return getFunctionType(retType, proto->arg_type_begin(), 5209 proto->getNumArgs(), EPI); 5210 } 5211 5212 if (allLTypes) return lhs; 5213 if (allRTypes) return rhs; 5214 return getFunctionNoProtoType(retType, einfo); 5215} 5216 5217QualType ASTContext::mergeTypes(QualType LHS, QualType RHS, 5218 bool OfBlockPointer, 5219 bool Unqualified) { 5220 // C++ [expr]: If an expression initially has the type "reference to T", the 5221 // type is adjusted to "T" prior to any further analysis, the expression 5222 // designates the object or function denoted by the reference, and the 5223 // expression is an lvalue unless the reference is an rvalue reference and 5224 // the expression is a function call (possibly inside parentheses). 5225 assert(!LHS->getAs<ReferenceType>() && "LHS is a reference type?"); 5226 assert(!RHS->getAs<ReferenceType>() && "RHS is a reference type?"); 5227 5228 if (Unqualified) { 5229 LHS = LHS.getUnqualifiedType(); 5230 RHS = RHS.getUnqualifiedType(); 5231 } 5232 5233 QualType LHSCan = getCanonicalType(LHS), 5234 RHSCan = getCanonicalType(RHS); 5235 5236 // If two types are identical, they are compatible. 5237 if (LHSCan == RHSCan) 5238 return LHS; 5239 5240 // If the qualifiers are different, the types aren't compatible... mostly. 5241 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5242 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5243 if (LQuals != RQuals) { 5244 // If any of these qualifiers are different, we have a type 5245 // mismatch. 5246 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5247 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5248 return QualType(); 5249 5250 // Exactly one GC qualifier difference is allowed: __strong is 5251 // okay if the other type has no GC qualifier but is an Objective 5252 // C object pointer (i.e. implicitly strong by default). We fix 5253 // this by pretending that the unqualified type was actually 5254 // qualified __strong. 5255 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5256 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5257 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5258 5259 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5260 return QualType(); 5261 5262 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 5263 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 5264 } 5265 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 5266 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 5267 } 5268 return QualType(); 5269 } 5270 5271 // Okay, qualifiers are equal. 5272 5273 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 5274 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 5275 5276 // We want to consider the two function types to be the same for these 5277 // comparisons, just force one to the other. 5278 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 5279 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 5280 5281 // Same as above for arrays 5282 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 5283 LHSClass = Type::ConstantArray; 5284 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 5285 RHSClass = Type::ConstantArray; 5286 5287 // ObjCInterfaces are just specialized ObjCObjects. 5288 if (LHSClass == Type::ObjCInterface) LHSClass = Type::ObjCObject; 5289 if (RHSClass == Type::ObjCInterface) RHSClass = Type::ObjCObject; 5290 5291 // Canonicalize ExtVector -> Vector. 5292 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 5293 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 5294 5295 // If the canonical type classes don't match. 5296 if (LHSClass != RHSClass) { 5297 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 5298 // a signed integer type, or an unsigned integer type. 5299 // Compatibility is based on the underlying type, not the promotion 5300 // type. 5301 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 5302 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 5303 return RHS; 5304 } 5305 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 5306 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 5307 return LHS; 5308 } 5309 5310 return QualType(); 5311 } 5312 5313 // The canonical type classes match. 5314 switch (LHSClass) { 5315#define TYPE(Class, Base) 5316#define ABSTRACT_TYPE(Class, Base) 5317#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: 5318#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 5319#define DEPENDENT_TYPE(Class, Base) case Type::Class: 5320#include "clang/AST/TypeNodes.def" 5321 assert(false && "Non-canonical and dependent types shouldn't get here"); 5322 return QualType(); 5323 5324 case Type::LValueReference: 5325 case Type::RValueReference: 5326 case Type::MemberPointer: 5327 assert(false && "C++ should never be in mergeTypes"); 5328 return QualType(); 5329 5330 case Type::ObjCInterface: 5331 case Type::IncompleteArray: 5332 case Type::VariableArray: 5333 case Type::FunctionProto: 5334 case Type::ExtVector: 5335 assert(false && "Types are eliminated above"); 5336 return QualType(); 5337 5338 case Type::Pointer: 5339 { 5340 // Merge two pointer types, while trying to preserve typedef info 5341 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 5342 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 5343 if (Unqualified) { 5344 LHSPointee = LHSPointee.getUnqualifiedType(); 5345 RHSPointee = RHSPointee.getUnqualifiedType(); 5346 } 5347 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, false, 5348 Unqualified); 5349 if (ResultType.isNull()) return QualType(); 5350 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5351 return LHS; 5352 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5353 return RHS; 5354 return getPointerType(ResultType); 5355 } 5356 case Type::BlockPointer: 5357 { 5358 // Merge two block pointer types, while trying to preserve typedef info 5359 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 5360 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 5361 if (Unqualified) { 5362 LHSPointee = LHSPointee.getUnqualifiedType(); 5363 RHSPointee = RHSPointee.getUnqualifiedType(); 5364 } 5365 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, OfBlockPointer, 5366 Unqualified); 5367 if (ResultType.isNull()) return QualType(); 5368 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5369 return LHS; 5370 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5371 return RHS; 5372 return getBlockPointerType(ResultType); 5373 } 5374 case Type::ConstantArray: 5375 { 5376 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 5377 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 5378 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 5379 return QualType(); 5380 5381 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 5382 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 5383 if (Unqualified) { 5384 LHSElem = LHSElem.getUnqualifiedType(); 5385 RHSElem = RHSElem.getUnqualifiedType(); 5386 } 5387 5388 QualType ResultType = mergeTypes(LHSElem, RHSElem, false, Unqualified); 5389 if (ResultType.isNull()) return QualType(); 5390 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5391 return LHS; 5392 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5393 return RHS; 5394 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 5395 ArrayType::ArraySizeModifier(), 0); 5396 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 5397 ArrayType::ArraySizeModifier(), 0); 5398 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 5399 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 5400 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5401 return LHS; 5402 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5403 return RHS; 5404 if (LVAT) { 5405 // FIXME: This isn't correct! But tricky to implement because 5406 // the array's size has to be the size of LHS, but the type 5407 // has to be different. 5408 return LHS; 5409 } 5410 if (RVAT) { 5411 // FIXME: This isn't correct! But tricky to implement because 5412 // the array's size has to be the size of RHS, but the type 5413 // has to be different. 5414 return RHS; 5415 } 5416 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 5417 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 5418 return getIncompleteArrayType(ResultType, 5419 ArrayType::ArraySizeModifier(), 0); 5420 } 5421 case Type::FunctionNoProto: 5422 return mergeFunctionTypes(LHS, RHS, OfBlockPointer, Unqualified); 5423 case Type::Record: 5424 case Type::Enum: 5425 return QualType(); 5426 case Type::Builtin: 5427 // Only exactly equal builtin types are compatible, which is tested above. 5428 return QualType(); 5429 case Type::Complex: 5430 // Distinct complex types are incompatible. 5431 return QualType(); 5432 case Type::Vector: 5433 // FIXME: The merged type should be an ExtVector! 5434 if (areCompatVectorTypes(LHSCan->getAs<VectorType>(), 5435 RHSCan->getAs<VectorType>())) 5436 return LHS; 5437 return QualType(); 5438 case Type::ObjCObject: { 5439 // Check if the types are assignment compatible. 5440 // FIXME: This should be type compatibility, e.g. whether 5441 // "LHS x; RHS x;" at global scope is legal. 5442 const ObjCObjectType* LHSIface = LHS->getAs<ObjCObjectType>(); 5443 const ObjCObjectType* RHSIface = RHS->getAs<ObjCObjectType>(); 5444 if (canAssignObjCInterfaces(LHSIface, RHSIface)) 5445 return LHS; 5446 5447 return QualType(); 5448 } 5449 case Type::ObjCObjectPointer: { 5450 if (OfBlockPointer) { 5451 if (canAssignObjCInterfacesInBlockPointer( 5452 LHS->getAs<ObjCObjectPointerType>(), 5453 RHS->getAs<ObjCObjectPointerType>())) 5454 return LHS; 5455 return QualType(); 5456 } 5457 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 5458 RHS->getAs<ObjCObjectPointerType>())) 5459 return LHS; 5460 5461 return QualType(); 5462 } 5463 } 5464 5465 return QualType(); 5466} 5467 5468/// mergeObjCGCQualifiers - This routine merges ObjC's GC attribute of 'LHS' and 5469/// 'RHS' attributes and returns the merged version; including for function 5470/// return types. 5471QualType ASTContext::mergeObjCGCQualifiers(QualType LHS, QualType RHS) { 5472 QualType LHSCan = getCanonicalType(LHS), 5473 RHSCan = getCanonicalType(RHS); 5474 // If two types are identical, they are compatible. 5475 if (LHSCan == RHSCan) 5476 return LHS; 5477 if (RHSCan->isFunctionType()) { 5478 if (!LHSCan->isFunctionType()) 5479 return QualType(); 5480 QualType OldReturnType = 5481 cast<FunctionType>(RHSCan.getTypePtr())->getResultType(); 5482 QualType NewReturnType = 5483 cast<FunctionType>(LHSCan.getTypePtr())->getResultType(); 5484 QualType ResReturnType = 5485 mergeObjCGCQualifiers(NewReturnType, OldReturnType); 5486 if (ResReturnType.isNull()) 5487 return QualType(); 5488 if (ResReturnType == NewReturnType || ResReturnType == OldReturnType) { 5489 // id foo(); ... __strong id foo(); or: __strong id foo(); ... id foo(); 5490 // In either case, use OldReturnType to build the new function type. 5491 const FunctionType *F = LHS->getAs<FunctionType>(); 5492 if (const FunctionProtoType *FPT = cast<FunctionProtoType>(F)) { 5493 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5494 EPI.ExtInfo = getFunctionExtInfo(LHS); 5495 QualType ResultType 5496 = getFunctionType(OldReturnType, FPT->arg_type_begin(), 5497 FPT->getNumArgs(), EPI); 5498 return ResultType; 5499 } 5500 } 5501 return QualType(); 5502 } 5503 5504 // If the qualifiers are different, the types can still be merged. 5505 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5506 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5507 if (LQuals != RQuals) { 5508 // If any of these qualifiers are different, we have a type mismatch. 5509 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5510 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5511 return QualType(); 5512 5513 // Exactly one GC qualifier difference is allowed: __strong is 5514 // okay if the other type has no GC qualifier but is an Objective 5515 // C object pointer (i.e. implicitly strong by default). We fix 5516 // this by pretending that the unqualified type was actually 5517 // qualified __strong. 5518 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5519 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5520 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5521 5522 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5523 return QualType(); 5524 5525 if (GC_L == Qualifiers::Strong) 5526 return LHS; 5527 if (GC_R == Qualifiers::Strong) 5528 return RHS; 5529 return QualType(); 5530 } 5531 5532 if (LHSCan->isObjCObjectPointerType() && RHSCan->isObjCObjectPointerType()) { 5533 QualType LHSBaseQT = LHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5534 QualType RHSBaseQT = RHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5535 QualType ResQT = mergeObjCGCQualifiers(LHSBaseQT, RHSBaseQT); 5536 if (ResQT == LHSBaseQT) 5537 return LHS; 5538 if (ResQT == RHSBaseQT) 5539 return RHS; 5540 } 5541 return QualType(); 5542} 5543 5544//===----------------------------------------------------------------------===// 5545// Integer Predicates 5546//===----------------------------------------------------------------------===// 5547 5548unsigned ASTContext::getIntWidth(QualType T) const { 5549 if (const EnumType *ET = dyn_cast<EnumType>(T)) 5550 T = ET->getDecl()->getIntegerType(); 5551 if (T->isBooleanType()) 5552 return 1; 5553 // For builtin types, just use the standard type sizing method 5554 return (unsigned)getTypeSize(T); 5555} 5556 5557QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 5558 assert(T->hasSignedIntegerRepresentation() && "Unexpected type"); 5559 5560 // Turn <4 x signed int> -> <4 x unsigned int> 5561 if (const VectorType *VTy = T->getAs<VectorType>()) 5562 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 5563 VTy->getNumElements(), VTy->getVectorKind()); 5564 5565 // For enums, we return the unsigned version of the base type. 5566 if (const EnumType *ETy = T->getAs<EnumType>()) 5567 T = ETy->getDecl()->getIntegerType(); 5568 5569 const BuiltinType *BTy = T->getAs<BuiltinType>(); 5570 assert(BTy && "Unexpected signed integer type"); 5571 switch (BTy->getKind()) { 5572 case BuiltinType::Char_S: 5573 case BuiltinType::SChar: 5574 return UnsignedCharTy; 5575 case BuiltinType::Short: 5576 return UnsignedShortTy; 5577 case BuiltinType::Int: 5578 return UnsignedIntTy; 5579 case BuiltinType::Long: 5580 return UnsignedLongTy; 5581 case BuiltinType::LongLong: 5582 return UnsignedLongLongTy; 5583 case BuiltinType::Int128: 5584 return UnsignedInt128Ty; 5585 default: 5586 assert(0 && "Unexpected signed integer type"); 5587 return QualType(); 5588 } 5589} 5590 5591ASTMutationListener::~ASTMutationListener() { } 5592 5593 5594//===----------------------------------------------------------------------===// 5595// Builtin Type Computation 5596//===----------------------------------------------------------------------===// 5597 5598/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 5599/// pointer over the consumed characters. This returns the resultant type. If 5600/// AllowTypeModifiers is false then modifier like * are not parsed, just basic 5601/// types. This allows "v2i*" to be parsed as a pointer to a v2i instead of 5602/// a vector of "i*". 5603/// 5604/// RequiresICE is filled in on return to indicate whether the value is required 5605/// to be an Integer Constant Expression. 5606static QualType DecodeTypeFromStr(const char *&Str, const ASTContext &Context, 5607 ASTContext::GetBuiltinTypeError &Error, 5608 bool &RequiresICE, 5609 bool AllowTypeModifiers) { 5610 // Modifiers. 5611 int HowLong = 0; 5612 bool Signed = false, Unsigned = false; 5613 RequiresICE = false; 5614 5615 // Read the prefixed modifiers first. 5616 bool Done = false; 5617 while (!Done) { 5618 switch (*Str++) { 5619 default: Done = true; --Str; break; 5620 case 'I': 5621 RequiresICE = true; 5622 break; 5623 case 'S': 5624 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 5625 assert(!Signed && "Can't use 'S' modifier multiple times!"); 5626 Signed = true; 5627 break; 5628 case 'U': 5629 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 5630 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 5631 Unsigned = true; 5632 break; 5633 case 'L': 5634 assert(HowLong <= 2 && "Can't have LLLL modifier"); 5635 ++HowLong; 5636 break; 5637 } 5638 } 5639 5640 QualType Type; 5641 5642 // Read the base type. 5643 switch (*Str++) { 5644 default: assert(0 && "Unknown builtin type letter!"); 5645 case 'v': 5646 assert(HowLong == 0 && !Signed && !Unsigned && 5647 "Bad modifiers used with 'v'!"); 5648 Type = Context.VoidTy; 5649 break; 5650 case 'f': 5651 assert(HowLong == 0 && !Signed && !Unsigned && 5652 "Bad modifiers used with 'f'!"); 5653 Type = Context.FloatTy; 5654 break; 5655 case 'd': 5656 assert(HowLong < 2 && !Signed && !Unsigned && 5657 "Bad modifiers used with 'd'!"); 5658 if (HowLong) 5659 Type = Context.LongDoubleTy; 5660 else 5661 Type = Context.DoubleTy; 5662 break; 5663 case 's': 5664 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 5665 if (Unsigned) 5666 Type = Context.UnsignedShortTy; 5667 else 5668 Type = Context.ShortTy; 5669 break; 5670 case 'i': 5671 if (HowLong == 3) 5672 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 5673 else if (HowLong == 2) 5674 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 5675 else if (HowLong == 1) 5676 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 5677 else 5678 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 5679 break; 5680 case 'c': 5681 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 5682 if (Signed) 5683 Type = Context.SignedCharTy; 5684 else if (Unsigned) 5685 Type = Context.UnsignedCharTy; 5686 else 5687 Type = Context.CharTy; 5688 break; 5689 case 'b': // boolean 5690 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 5691 Type = Context.BoolTy; 5692 break; 5693 case 'z': // size_t. 5694 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 5695 Type = Context.getSizeType(); 5696 break; 5697 case 'F': 5698 Type = Context.getCFConstantStringType(); 5699 break; 5700 case 'G': 5701 Type = Context.getObjCIdType(); 5702 break; 5703 case 'H': 5704 Type = Context.getObjCSelType(); 5705 break; 5706 case 'a': 5707 Type = Context.getBuiltinVaListType(); 5708 assert(!Type.isNull() && "builtin va list type not initialized!"); 5709 break; 5710 case 'A': 5711 // This is a "reference" to a va_list; however, what exactly 5712 // this means depends on how va_list is defined. There are two 5713 // different kinds of va_list: ones passed by value, and ones 5714 // passed by reference. An example of a by-value va_list is 5715 // x86, where va_list is a char*. An example of by-ref va_list 5716 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 5717 // we want this argument to be a char*&; for x86-64, we want 5718 // it to be a __va_list_tag*. 5719 Type = Context.getBuiltinVaListType(); 5720 assert(!Type.isNull() && "builtin va list type not initialized!"); 5721 if (Type->isArrayType()) 5722 Type = Context.getArrayDecayedType(Type); 5723 else 5724 Type = Context.getLValueReferenceType(Type); 5725 break; 5726 case 'V': { 5727 char *End; 5728 unsigned NumElements = strtoul(Str, &End, 10); 5729 assert(End != Str && "Missing vector size"); 5730 Str = End; 5731 5732 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, 5733 RequiresICE, false); 5734 assert(!RequiresICE && "Can't require vector ICE"); 5735 5736 // TODO: No way to make AltiVec vectors in builtins yet. 5737 Type = Context.getVectorType(ElementType, NumElements, 5738 VectorType::GenericVector); 5739 break; 5740 } 5741 case 'X': { 5742 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, RequiresICE, 5743 false); 5744 assert(!RequiresICE && "Can't require complex ICE"); 5745 Type = Context.getComplexType(ElementType); 5746 break; 5747 } 5748 case 'P': 5749 Type = Context.getFILEType(); 5750 if (Type.isNull()) { 5751 Error = ASTContext::GE_Missing_stdio; 5752 return QualType(); 5753 } 5754 break; 5755 case 'J': 5756 if (Signed) 5757 Type = Context.getsigjmp_bufType(); 5758 else 5759 Type = Context.getjmp_bufType(); 5760 5761 if (Type.isNull()) { 5762 Error = ASTContext::GE_Missing_setjmp; 5763 return QualType(); 5764 } 5765 break; 5766 } 5767 5768 // If there are modifiers and if we're allowed to parse them, go for it. 5769 Done = !AllowTypeModifiers; 5770 while (!Done) { 5771 switch (char c = *Str++) { 5772 default: Done = true; --Str; break; 5773 case '*': 5774 case '&': { 5775 // Both pointers and references can have their pointee types 5776 // qualified with an address space. 5777 char *End; 5778 unsigned AddrSpace = strtoul(Str, &End, 10); 5779 if (End != Str && AddrSpace != 0) { 5780 Type = Context.getAddrSpaceQualType(Type, AddrSpace); 5781 Str = End; 5782 } 5783 if (c == '*') 5784 Type = Context.getPointerType(Type); 5785 else 5786 Type = Context.getLValueReferenceType(Type); 5787 break; 5788 } 5789 // FIXME: There's no way to have a built-in with an rvalue ref arg. 5790 case 'C': 5791 Type = Type.withConst(); 5792 break; 5793 case 'D': 5794 Type = Context.getVolatileType(Type); 5795 break; 5796 } 5797 } 5798 5799 assert((!RequiresICE || Type->isIntegralOrEnumerationType()) && 5800 "Integer constant 'I' type must be an integer"); 5801 5802 return Type; 5803} 5804 5805/// GetBuiltinType - Return the type for the specified builtin. 5806QualType ASTContext::GetBuiltinType(unsigned Id, 5807 GetBuiltinTypeError &Error, 5808 unsigned *IntegerConstantArgs) const { 5809 const char *TypeStr = BuiltinInfo.GetTypeString(Id); 5810 5811 llvm::SmallVector<QualType, 8> ArgTypes; 5812 5813 bool RequiresICE = false; 5814 Error = GE_None; 5815 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error, 5816 RequiresICE, true); 5817 if (Error != GE_None) 5818 return QualType(); 5819 5820 assert(!RequiresICE && "Result of intrinsic cannot be required to be an ICE"); 5821 5822 while (TypeStr[0] && TypeStr[0] != '.') { 5823 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error, RequiresICE, true); 5824 if (Error != GE_None) 5825 return QualType(); 5826 5827 // If this argument is required to be an IntegerConstantExpression and the 5828 // caller cares, fill in the bitmask we return. 5829 if (RequiresICE && IntegerConstantArgs) 5830 *IntegerConstantArgs |= 1 << ArgTypes.size(); 5831 5832 // Do array -> pointer decay. The builtin should use the decayed type. 5833 if (Ty->isArrayType()) 5834 Ty = getArrayDecayedType(Ty); 5835 5836 ArgTypes.push_back(Ty); 5837 } 5838 5839 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 5840 "'.' should only occur at end of builtin type list!"); 5841 5842 FunctionType::ExtInfo EI; 5843 if (BuiltinInfo.isNoReturn(Id)) EI = EI.withNoReturn(true); 5844 5845 bool Variadic = (TypeStr[0] == '.'); 5846 5847 // We really shouldn't be making a no-proto type here, especially in C++. 5848 if (ArgTypes.empty() && Variadic) 5849 return getFunctionNoProtoType(ResType, EI); 5850 5851 FunctionProtoType::ExtProtoInfo EPI; 5852 EPI.ExtInfo = EI; 5853 EPI.Variadic = Variadic; 5854 5855 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), EPI); 5856} 5857 5858GVALinkage ASTContext::GetGVALinkageForFunction(const FunctionDecl *FD) { 5859 GVALinkage External = GVA_StrongExternal; 5860 5861 Linkage L = FD->getLinkage(); 5862 switch (L) { 5863 case NoLinkage: 5864 case InternalLinkage: 5865 case UniqueExternalLinkage: 5866 return GVA_Internal; 5867 5868 case ExternalLinkage: 5869 switch (FD->getTemplateSpecializationKind()) { 5870 case TSK_Undeclared: 5871 case TSK_ExplicitSpecialization: 5872 External = GVA_StrongExternal; 5873 break; 5874 5875 case TSK_ExplicitInstantiationDefinition: 5876 return GVA_ExplicitTemplateInstantiation; 5877 5878 case TSK_ExplicitInstantiationDeclaration: 5879 case TSK_ImplicitInstantiation: 5880 External = GVA_TemplateInstantiation; 5881 break; 5882 } 5883 } 5884 5885 if (!FD->isInlined()) 5886 return External; 5887 5888 if (!getLangOptions().CPlusPlus || FD->hasAttr<GNUInlineAttr>()) { 5889 // GNU or C99 inline semantics. Determine whether this symbol should be 5890 // externally visible. 5891 if (FD->isInlineDefinitionExternallyVisible()) 5892 return External; 5893 5894 // C99 inline semantics, where the symbol is not externally visible. 5895 return GVA_C99Inline; 5896 } 5897 5898 // C++0x [temp.explicit]p9: 5899 // [ Note: The intent is that an inline function that is the subject of 5900 // an explicit instantiation declaration will still be implicitly 5901 // instantiated when used so that the body can be considered for 5902 // inlining, but that no out-of-line copy of the inline function would be 5903 // generated in the translation unit. -- end note ] 5904 if (FD->getTemplateSpecializationKind() 5905 == TSK_ExplicitInstantiationDeclaration) 5906 return GVA_C99Inline; 5907 5908 return GVA_CXXInline; 5909} 5910 5911GVALinkage ASTContext::GetGVALinkageForVariable(const VarDecl *VD) { 5912 // If this is a static data member, compute the kind of template 5913 // specialization. Otherwise, this variable is not part of a 5914 // template. 5915 TemplateSpecializationKind TSK = TSK_Undeclared; 5916 if (VD->isStaticDataMember()) 5917 TSK = VD->getTemplateSpecializationKind(); 5918 5919 Linkage L = VD->getLinkage(); 5920 if (L == ExternalLinkage && getLangOptions().CPlusPlus && 5921 VD->getType()->getLinkage() == UniqueExternalLinkage) 5922 L = UniqueExternalLinkage; 5923 5924 switch (L) { 5925 case NoLinkage: 5926 case InternalLinkage: 5927 case UniqueExternalLinkage: 5928 return GVA_Internal; 5929 5930 case ExternalLinkage: 5931 switch (TSK) { 5932 case TSK_Undeclared: 5933 case TSK_ExplicitSpecialization: 5934 return GVA_StrongExternal; 5935 5936 case TSK_ExplicitInstantiationDeclaration: 5937 llvm_unreachable("Variable should not be instantiated"); 5938 // Fall through to treat this like any other instantiation. 5939 5940 case TSK_ExplicitInstantiationDefinition: 5941 return GVA_ExplicitTemplateInstantiation; 5942 5943 case TSK_ImplicitInstantiation: 5944 return GVA_TemplateInstantiation; 5945 } 5946 } 5947 5948 return GVA_StrongExternal; 5949} 5950 5951bool ASTContext::DeclMustBeEmitted(const Decl *D) { 5952 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 5953 if (!VD->isFileVarDecl()) 5954 return false; 5955 } else if (!isa<FunctionDecl>(D)) 5956 return false; 5957 5958 // Weak references don't produce any output by themselves. 5959 if (D->hasAttr<WeakRefAttr>()) 5960 return false; 5961 5962 // Aliases and used decls are required. 5963 if (D->hasAttr<AliasAttr>() || D->hasAttr<UsedAttr>()) 5964 return true; 5965 5966 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 5967 // Forward declarations aren't required. 5968 if (!FD->isThisDeclarationADefinition()) 5969 return false; 5970 5971 // Constructors and destructors are required. 5972 if (FD->hasAttr<ConstructorAttr>() || FD->hasAttr<DestructorAttr>()) 5973 return true; 5974 5975 // The key function for a class is required. 5976 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 5977 const CXXRecordDecl *RD = MD->getParent(); 5978 if (MD->isOutOfLine() && RD->isDynamicClass()) { 5979 const CXXMethodDecl *KeyFunc = getKeyFunction(RD); 5980 if (KeyFunc && KeyFunc->getCanonicalDecl() == MD->getCanonicalDecl()) 5981 return true; 5982 } 5983 } 5984 5985 GVALinkage Linkage = GetGVALinkageForFunction(FD); 5986 5987 // static, static inline, always_inline, and extern inline functions can 5988 // always be deferred. Normal inline functions can be deferred in C99/C++. 5989 // Implicit template instantiations can also be deferred in C++. 5990 if (Linkage == GVA_Internal || Linkage == GVA_C99Inline || 5991 Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) 5992 return false; 5993 return true; 5994 } 5995 5996 const VarDecl *VD = cast<VarDecl>(D); 5997 assert(VD->isFileVarDecl() && "Expected file scoped var"); 5998 5999 if (VD->isThisDeclarationADefinition() == VarDecl::DeclarationOnly) 6000 return false; 6001 6002 // Structs that have non-trivial constructors or destructors are required. 6003 6004 // FIXME: Handle references. 6005 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 6006 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 6007 if (RD->hasDefinition() && 6008 (!RD->hasTrivialConstructor() || !RD->hasTrivialDestructor())) 6009 return true; 6010 } 6011 } 6012 6013 GVALinkage L = GetGVALinkageForVariable(VD); 6014 if (L == GVA_Internal || L == GVA_TemplateInstantiation) { 6015 if (!(VD->getInit() && VD->getInit()->HasSideEffects(*this))) 6016 return false; 6017 } 6018 6019 return true; 6020} 6021 6022CallingConv ASTContext::getDefaultMethodCallConv() { 6023 // Pass through to the C++ ABI object 6024 return ABI->getDefaultMethodCallConv(); 6025} 6026 6027bool ASTContext::isNearlyEmpty(const CXXRecordDecl *RD) const { 6028 // Pass through to the C++ ABI object 6029 return ABI->isNearlyEmpty(RD); 6030} 6031 6032MangleContext *ASTContext::createMangleContext() { 6033 switch (Target.getCXXABI()) { 6034 case CXXABI_ARM: 6035 case CXXABI_Itanium: 6036 return createItaniumMangleContext(*this, getDiagnostics()); 6037 case CXXABI_Microsoft: 6038 return createMicrosoftMangleContext(*this, getDiagnostics()); 6039 } 6040 assert(0 && "Unsupported ABI"); 6041 return 0; 6042} 6043 6044CXXABI::~CXXABI() {} 6045