ASTContext.cpp revision 6952f1e4256c5b43aee5e98cea4e9b663bd1d413
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(), TTP->getDepth(), 111 TTP->getIndex(), 0, false, 112 TTP->isParameterPack())); 113 else if (NonTypeTemplateParmDecl *NTTP 114 = dyn_cast<NonTypeTemplateParmDecl>(*P)) { 115 QualType T = getCanonicalType(NTTP->getType()); 116 TypeSourceInfo *TInfo = getTrivialTypeSourceInfo(T); 117 NonTypeTemplateParmDecl *Param; 118 if (NTTP->isExpandedParameterPack()) { 119 llvm::SmallVector<QualType, 2> ExpandedTypes; 120 llvm::SmallVector<TypeSourceInfo *, 2> ExpandedTInfos; 121 for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I) { 122 ExpandedTypes.push_back(getCanonicalType(NTTP->getExpansionType(I))); 123 ExpandedTInfos.push_back( 124 getTrivialTypeSourceInfo(ExpandedTypes.back())); 125 } 126 127 Param = NonTypeTemplateParmDecl::Create(*this, getTranslationUnitDecl(), 128 SourceLocation(), 129 NTTP->getDepth(), 130 NTTP->getPosition(), 0, 131 T, 132 TInfo, 133 ExpandedTypes.data(), 134 ExpandedTypes.size(), 135 ExpandedTInfos.data()); 136 } else { 137 Param = NonTypeTemplateParmDecl::Create(*this, getTranslationUnitDecl(), 138 SourceLocation(), 139 NTTP->getDepth(), 140 NTTP->getPosition(), 0, 141 T, 142 NTTP->isParameterPack(), 143 TInfo); 144 } 145 CanonParams.push_back(Param); 146 147 } else 148 CanonParams.push_back(getCanonicalTemplateTemplateParmDecl( 149 cast<TemplateTemplateParmDecl>(*P))); 150 } 151 152 TemplateTemplateParmDecl *CanonTTP 153 = TemplateTemplateParmDecl::Create(*this, getTranslationUnitDecl(), 154 SourceLocation(), TTP->getDepth(), 155 TTP->getPosition(), 156 TTP->isParameterPack(), 157 0, 158 TemplateParameterList::Create(*this, SourceLocation(), 159 SourceLocation(), 160 CanonParams.data(), 161 CanonParams.size(), 162 SourceLocation())); 163 164 // Get the new insert position for the node we care about. 165 Canonical = CanonTemplateTemplateParms.FindNodeOrInsertPos(ID, InsertPos); 166 assert(Canonical == 0 && "Shouldn't be in the map!"); 167 (void)Canonical; 168 169 // Create the canonical template template parameter entry. 170 Canonical = new (*this) CanonicalTemplateTemplateParm(CanonTTP); 171 CanonTemplateTemplateParms.InsertNode(Canonical, InsertPos); 172 return CanonTTP; 173} 174 175CXXABI *ASTContext::createCXXABI(const TargetInfo &T) { 176 if (!LangOpts.CPlusPlus) return 0; 177 178 switch (T.getCXXABI()) { 179 case CXXABI_ARM: 180 return CreateARMCXXABI(*this); 181 case CXXABI_Itanium: 182 return CreateItaniumCXXABI(*this); 183 case CXXABI_Microsoft: 184 return CreateMicrosoftCXXABI(*this); 185 } 186 return 0; 187} 188 189ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 190 const TargetInfo &t, 191 IdentifierTable &idents, SelectorTable &sels, 192 Builtin::Context &builtins, 193 unsigned size_reserve) : 194 TemplateSpecializationTypes(this_()), 195 DependentTemplateSpecializationTypes(this_()), 196 GlobalNestedNameSpecifier(0), IsInt128Installed(false), 197 CFConstantStringTypeDecl(0), NSConstantStringTypeDecl(0), 198 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 199 sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0), 200 NullTypeSourceInfo(QualType()), 201 SourceMgr(SM), LangOpts(LOpts), ABI(createCXXABI(t)), Target(t), 202 Idents(idents), Selectors(sels), 203 BuiltinInfo(builtins), 204 DeclarationNames(*this), 205 ExternalSource(0), Listener(0), PrintingPolicy(LOpts), 206 LastSDM(0, 0), 207 UniqueBlockByRefTypeID(0), UniqueBlockParmTypeID(0) { 208 ObjCIdRedefinitionType = QualType(); 209 ObjCClassRedefinitionType = QualType(); 210 ObjCSelRedefinitionType = QualType(); 211 if (size_reserve > 0) Types.reserve(size_reserve); 212 TUDecl = TranslationUnitDecl::Create(*this); 213 InitBuiltinTypes(); 214} 215 216ASTContext::~ASTContext() { 217 // Release the DenseMaps associated with DeclContext objects. 218 // FIXME: Is this the ideal solution? 219 ReleaseDeclContextMaps(); 220 221 // Call all of the deallocation functions. 222 for (unsigned I = 0, N = Deallocations.size(); I != N; ++I) 223 Deallocations[I].first(Deallocations[I].second); 224 225 // Release all of the memory associated with overridden C++ methods. 226 for (llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::iterator 227 OM = OverriddenMethods.begin(), OMEnd = OverriddenMethods.end(); 228 OM != OMEnd; ++OM) 229 OM->second.Destroy(); 230 231 // ASTRecordLayout objects in ASTRecordLayouts must always be destroyed 232 // because they can contain DenseMaps. 233 for (llvm::DenseMap<const ObjCContainerDecl*, 234 const ASTRecordLayout*>::iterator 235 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); I != E; ) 236 // Increment in loop to prevent using deallocated memory. 237 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 238 R->Destroy(*this); 239 240 for (llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 241 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); I != E; ) { 242 // Increment in loop to prevent using deallocated memory. 243 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 244 R->Destroy(*this); 245 } 246 247 for (llvm::DenseMap<const Decl*, AttrVec*>::iterator A = DeclAttrs.begin(), 248 AEnd = DeclAttrs.end(); 249 A != AEnd; ++A) 250 A->second->~AttrVec(); 251} 252 253void ASTContext::AddDeallocation(void (*Callback)(void*), void *Data) { 254 Deallocations.push_back(std::make_pair(Callback, Data)); 255} 256 257void 258ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 259 ExternalSource.reset(Source.take()); 260} 261 262void ASTContext::PrintStats() const { 263 fprintf(stderr, "*** AST Context Stats:\n"); 264 fprintf(stderr, " %d types total.\n", (int)Types.size()); 265 266 unsigned counts[] = { 267#define TYPE(Name, Parent) 0, 268#define ABSTRACT_TYPE(Name, Parent) 269#include "clang/AST/TypeNodes.def" 270 0 // Extra 271 }; 272 273 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 274 Type *T = Types[i]; 275 counts[(unsigned)T->getTypeClass()]++; 276 } 277 278 unsigned Idx = 0; 279 unsigned TotalBytes = 0; 280#define TYPE(Name, Parent) \ 281 if (counts[Idx]) \ 282 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 283 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 284 ++Idx; 285#define ABSTRACT_TYPE(Name, Parent) 286#include "clang/AST/TypeNodes.def" 287 288 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 289 290 // Implicit special member functions. 291 fprintf(stderr, " %u/%u implicit default constructors created\n", 292 NumImplicitDefaultConstructorsDeclared, 293 NumImplicitDefaultConstructors); 294 fprintf(stderr, " %u/%u implicit copy constructors created\n", 295 NumImplicitCopyConstructorsDeclared, 296 NumImplicitCopyConstructors); 297 fprintf(stderr, " %u/%u implicit copy assignment operators created\n", 298 NumImplicitCopyAssignmentOperatorsDeclared, 299 NumImplicitCopyAssignmentOperators); 300 fprintf(stderr, " %u/%u implicit destructors created\n", 301 NumImplicitDestructorsDeclared, NumImplicitDestructors); 302 303 if (ExternalSource.get()) { 304 fprintf(stderr, "\n"); 305 ExternalSource->PrintStats(); 306 } 307 308 BumpAlloc.PrintStats(); 309} 310 311 312void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 313 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 314 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 315 Types.push_back(Ty); 316} 317 318void ASTContext::InitBuiltinTypes() { 319 assert(VoidTy.isNull() && "Context reinitialized?"); 320 321 // C99 6.2.5p19. 322 InitBuiltinType(VoidTy, BuiltinType::Void); 323 324 // C99 6.2.5p2. 325 InitBuiltinType(BoolTy, BuiltinType::Bool); 326 // C99 6.2.5p3. 327 if (LangOpts.CharIsSigned) 328 InitBuiltinType(CharTy, BuiltinType::Char_S); 329 else 330 InitBuiltinType(CharTy, BuiltinType::Char_U); 331 // C99 6.2.5p4. 332 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 333 InitBuiltinType(ShortTy, BuiltinType::Short); 334 InitBuiltinType(IntTy, BuiltinType::Int); 335 InitBuiltinType(LongTy, BuiltinType::Long); 336 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 337 338 // C99 6.2.5p6. 339 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 340 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 341 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 342 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 343 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 344 345 // C99 6.2.5p10. 346 InitBuiltinType(FloatTy, BuiltinType::Float); 347 InitBuiltinType(DoubleTy, BuiltinType::Double); 348 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 349 350 // GNU extension, 128-bit integers. 351 InitBuiltinType(Int128Ty, BuiltinType::Int128); 352 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 353 354 if (LangOpts.CPlusPlus) { // C++ 3.9.1p5 355 if (!LangOpts.ShortWChar) 356 InitBuiltinType(WCharTy, BuiltinType::WChar_S); 357 else // -fshort-wchar makes wchar_t be unsigned. 358 InitBuiltinType(WCharTy, BuiltinType::WChar_U); 359 } else // C99 360 WCharTy = getFromTargetType(Target.getWCharType()); 361 362 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 363 InitBuiltinType(Char16Ty, BuiltinType::Char16); 364 else // C99 365 Char16Ty = getFromTargetType(Target.getChar16Type()); 366 367 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 368 InitBuiltinType(Char32Ty, BuiltinType::Char32); 369 else // C99 370 Char32Ty = getFromTargetType(Target.getChar32Type()); 371 372 // Placeholder type for type-dependent expressions whose type is 373 // completely unknown. No code should ever check a type against 374 // DependentTy and users should never see it; however, it is here to 375 // help diagnose failures to properly check for type-dependent 376 // expressions. 377 InitBuiltinType(DependentTy, BuiltinType::Dependent); 378 379 // Placeholder type for functions. 380 InitBuiltinType(OverloadTy, BuiltinType::Overload); 381 382 // Placeholder type for C++0x auto declarations whose real type has 383 // not yet been deduced. 384 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 385 386 // C99 6.2.5p11. 387 FloatComplexTy = getComplexType(FloatTy); 388 DoubleComplexTy = getComplexType(DoubleTy); 389 LongDoubleComplexTy = getComplexType(LongDoubleTy); 390 391 BuiltinVaListType = QualType(); 392 393 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 394 ObjCIdTypedefType = QualType(); 395 ObjCClassTypedefType = QualType(); 396 ObjCSelTypedefType = QualType(); 397 398 // Builtin types for 'id', 'Class', and 'SEL'. 399 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 400 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 401 InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel); 402 403 ObjCConstantStringType = QualType(); 404 405 // void * type 406 VoidPtrTy = getPointerType(VoidTy); 407 408 // nullptr type (C++0x 2.14.7) 409 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 410} 411 412Diagnostic &ASTContext::getDiagnostics() const { 413 return SourceMgr.getDiagnostics(); 414} 415 416AttrVec& ASTContext::getDeclAttrs(const Decl *D) { 417 AttrVec *&Result = DeclAttrs[D]; 418 if (!Result) { 419 void *Mem = Allocate(sizeof(AttrVec)); 420 Result = new (Mem) AttrVec; 421 } 422 423 return *Result; 424} 425 426/// \brief Erase the attributes corresponding to the given declaration. 427void ASTContext::eraseDeclAttrs(const Decl *D) { 428 llvm::DenseMap<const Decl*, AttrVec*>::iterator Pos = DeclAttrs.find(D); 429 if (Pos != DeclAttrs.end()) { 430 Pos->second->~AttrVec(); 431 DeclAttrs.erase(Pos); 432 } 433} 434 435 436MemberSpecializationInfo * 437ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 438 assert(Var->isStaticDataMember() && "Not a static data member"); 439 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 440 = InstantiatedFromStaticDataMember.find(Var); 441 if (Pos == InstantiatedFromStaticDataMember.end()) 442 return 0; 443 444 return Pos->second; 445} 446 447void 448ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 449 TemplateSpecializationKind TSK, 450 SourceLocation PointOfInstantiation) { 451 assert(Inst->isStaticDataMember() && "Not a static data member"); 452 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 453 assert(!InstantiatedFromStaticDataMember[Inst] && 454 "Already noted what static data member was instantiated from"); 455 InstantiatedFromStaticDataMember[Inst] 456 = new (*this) MemberSpecializationInfo(Tmpl, TSK, PointOfInstantiation); 457} 458 459NamedDecl * 460ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) { 461 llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos 462 = InstantiatedFromUsingDecl.find(UUD); 463 if (Pos == InstantiatedFromUsingDecl.end()) 464 return 0; 465 466 return Pos->second; 467} 468 469void 470ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) { 471 assert((isa<UsingDecl>(Pattern) || 472 isa<UnresolvedUsingValueDecl>(Pattern) || 473 isa<UnresolvedUsingTypenameDecl>(Pattern)) && 474 "pattern decl is not a using decl"); 475 assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists"); 476 InstantiatedFromUsingDecl[Inst] = Pattern; 477} 478 479UsingShadowDecl * 480ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) { 481 llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos 482 = InstantiatedFromUsingShadowDecl.find(Inst); 483 if (Pos == InstantiatedFromUsingShadowDecl.end()) 484 return 0; 485 486 return Pos->second; 487} 488 489void 490ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst, 491 UsingShadowDecl *Pattern) { 492 assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists"); 493 InstantiatedFromUsingShadowDecl[Inst] = Pattern; 494} 495 496FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 497 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 498 = InstantiatedFromUnnamedFieldDecl.find(Field); 499 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 500 return 0; 501 502 return Pos->second; 503} 504 505void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 506 FieldDecl *Tmpl) { 507 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 508 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 509 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 510 "Already noted what unnamed field was instantiated from"); 511 512 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 513} 514 515ASTContext::overridden_cxx_method_iterator 516ASTContext::overridden_methods_begin(const CXXMethodDecl *Method) const { 517 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 518 = OverriddenMethods.find(Method); 519 if (Pos == OverriddenMethods.end()) 520 return 0; 521 522 return Pos->second.begin(); 523} 524 525ASTContext::overridden_cxx_method_iterator 526ASTContext::overridden_methods_end(const CXXMethodDecl *Method) const { 527 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 528 = OverriddenMethods.find(Method); 529 if (Pos == OverriddenMethods.end()) 530 return 0; 531 532 return Pos->second.end(); 533} 534 535unsigned 536ASTContext::overridden_methods_size(const CXXMethodDecl *Method) const { 537 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 538 = OverriddenMethods.find(Method); 539 if (Pos == OverriddenMethods.end()) 540 return 0; 541 542 return Pos->second.size(); 543} 544 545void ASTContext::addOverriddenMethod(const CXXMethodDecl *Method, 546 const CXXMethodDecl *Overridden) { 547 OverriddenMethods[Method].push_back(Overridden); 548} 549 550//===----------------------------------------------------------------------===// 551// Type Sizing and Analysis 552//===----------------------------------------------------------------------===// 553 554/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 555/// scalar floating point type. 556const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 557 const BuiltinType *BT = T->getAs<BuiltinType>(); 558 assert(BT && "Not a floating point type!"); 559 switch (BT->getKind()) { 560 default: assert(0 && "Not a floating point type!"); 561 case BuiltinType::Float: return Target.getFloatFormat(); 562 case BuiltinType::Double: return Target.getDoubleFormat(); 563 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 564 } 565} 566 567/// getDeclAlign - Return a conservative estimate of the alignment of the 568/// specified decl. Note that bitfields do not have a valid alignment, so 569/// this method will assert on them. 570/// If @p RefAsPointee, references are treated like their underlying type 571/// (for alignof), else they're treated like pointers (for CodeGen). 572CharUnits ASTContext::getDeclAlign(const Decl *D, bool RefAsPointee) const { 573 unsigned Align = Target.getCharWidth(); 574 575 bool UseAlignAttrOnly = false; 576 if (unsigned AlignFromAttr = D->getMaxAlignment()) { 577 Align = AlignFromAttr; 578 579 // __attribute__((aligned)) can increase or decrease alignment 580 // *except* on a struct or struct member, where it only increases 581 // alignment unless 'packed' is also specified. 582 // 583 // It is an error for [[align]] to decrease alignment, so we can 584 // ignore that possibility; Sema should diagnose it. 585 if (isa<FieldDecl>(D)) { 586 UseAlignAttrOnly = D->hasAttr<PackedAttr>() || 587 cast<FieldDecl>(D)->getParent()->hasAttr<PackedAttr>(); 588 } else { 589 UseAlignAttrOnly = true; 590 } 591 } 592 593 if (UseAlignAttrOnly) { 594 // ignore type of value 595 } else if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 596 QualType T = VD->getType(); 597 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 598 if (RefAsPointee) 599 T = RT->getPointeeType(); 600 else 601 T = getPointerType(RT->getPointeeType()); 602 } 603 if (!T->isIncompleteType() && !T->isFunctionType()) { 604 // Adjust alignments of declarations with array type by the 605 // large-array alignment on the target. 606 unsigned MinWidth = Target.getLargeArrayMinWidth(); 607 const ArrayType *arrayType; 608 if (MinWidth && (arrayType = getAsArrayType(T))) { 609 if (isa<VariableArrayType>(arrayType)) 610 Align = std::max(Align, Target.getLargeArrayAlign()); 611 else if (isa<ConstantArrayType>(arrayType) && 612 MinWidth <= getTypeSize(cast<ConstantArrayType>(arrayType))) 613 Align = std::max(Align, Target.getLargeArrayAlign()); 614 615 // Walk through any array types while we're at it. 616 T = getBaseElementType(arrayType); 617 } 618 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 619 } 620 if (const FieldDecl *FD = dyn_cast<FieldDecl>(VD)) { 621 // In the case of a field in a packed struct, we want the minimum 622 // of the alignment of the field and the alignment of the struct. 623 Align = std::min(Align, 624 getPreferredTypeAlign(FD->getParent()->getTypeForDecl())); 625 } 626 } 627 628 return toCharUnitsFromBits(Align); 629} 630 631std::pair<CharUnits, CharUnits> 632ASTContext::getTypeInfoInChars(const Type *T) { 633 std::pair<uint64_t, unsigned> Info = getTypeInfo(T); 634 return std::make_pair(toCharUnitsFromBits(Info.first), 635 toCharUnitsFromBits(Info.second)); 636} 637 638std::pair<CharUnits, CharUnits> 639ASTContext::getTypeInfoInChars(QualType T) { 640 return getTypeInfoInChars(T.getTypePtr()); 641} 642 643/// getTypeSize - Return the size of the specified type, in bits. This method 644/// does not work on incomplete types. 645/// 646/// FIXME: Pointers into different addr spaces could have different sizes and 647/// alignment requirements: getPointerInfo should take an AddrSpace, this 648/// should take a QualType, &c. 649std::pair<uint64_t, unsigned> 650ASTContext::getTypeInfo(const Type *T) const { 651 uint64_t Width=0; 652 unsigned Align=8; 653 switch (T->getTypeClass()) { 654#define TYPE(Class, Base) 655#define ABSTRACT_TYPE(Class, Base) 656#define NON_CANONICAL_TYPE(Class, Base) 657#define DEPENDENT_TYPE(Class, Base) case Type::Class: 658#include "clang/AST/TypeNodes.def" 659 assert(false && "Should not see dependent types"); 660 break; 661 662 case Type::FunctionNoProto: 663 case Type::FunctionProto: 664 // GCC extension: alignof(function) = 32 bits 665 Width = 0; 666 Align = 32; 667 break; 668 669 case Type::IncompleteArray: 670 case Type::VariableArray: 671 Width = 0; 672 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 673 break; 674 675 case Type::ConstantArray: { 676 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 677 678 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 679 Width = EltInfo.first*CAT->getSize().getZExtValue(); 680 Align = EltInfo.second; 681 break; 682 } 683 case Type::ExtVector: 684 case Type::Vector: { 685 const VectorType *VT = cast<VectorType>(T); 686 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 687 Width = EltInfo.first*VT->getNumElements(); 688 Align = Width; 689 // If the alignment is not a power of 2, round up to the next power of 2. 690 // This happens for non-power-of-2 length vectors. 691 if (Align & (Align-1)) { 692 Align = llvm::NextPowerOf2(Align); 693 Width = llvm::RoundUpToAlignment(Width, Align); 694 } 695 break; 696 } 697 698 case Type::Builtin: 699 switch (cast<BuiltinType>(T)->getKind()) { 700 default: assert(0 && "Unknown builtin type!"); 701 case BuiltinType::Void: 702 // GCC extension: alignof(void) = 8 bits. 703 Width = 0; 704 Align = 8; 705 break; 706 707 case BuiltinType::Bool: 708 Width = Target.getBoolWidth(); 709 Align = Target.getBoolAlign(); 710 break; 711 case BuiltinType::Char_S: 712 case BuiltinType::Char_U: 713 case BuiltinType::UChar: 714 case BuiltinType::SChar: 715 Width = Target.getCharWidth(); 716 Align = Target.getCharAlign(); 717 break; 718 case BuiltinType::WChar_S: 719 case BuiltinType::WChar_U: 720 Width = Target.getWCharWidth(); 721 Align = Target.getWCharAlign(); 722 break; 723 case BuiltinType::Char16: 724 Width = Target.getChar16Width(); 725 Align = Target.getChar16Align(); 726 break; 727 case BuiltinType::Char32: 728 Width = Target.getChar32Width(); 729 Align = Target.getChar32Align(); 730 break; 731 case BuiltinType::UShort: 732 case BuiltinType::Short: 733 Width = Target.getShortWidth(); 734 Align = Target.getShortAlign(); 735 break; 736 case BuiltinType::UInt: 737 case BuiltinType::Int: 738 Width = Target.getIntWidth(); 739 Align = Target.getIntAlign(); 740 break; 741 case BuiltinType::ULong: 742 case BuiltinType::Long: 743 Width = Target.getLongWidth(); 744 Align = Target.getLongAlign(); 745 break; 746 case BuiltinType::ULongLong: 747 case BuiltinType::LongLong: 748 Width = Target.getLongLongWidth(); 749 Align = Target.getLongLongAlign(); 750 break; 751 case BuiltinType::Int128: 752 case BuiltinType::UInt128: 753 Width = 128; 754 Align = 128; // int128_t is 128-bit aligned on all targets. 755 break; 756 case BuiltinType::Float: 757 Width = Target.getFloatWidth(); 758 Align = Target.getFloatAlign(); 759 break; 760 case BuiltinType::Double: 761 Width = Target.getDoubleWidth(); 762 Align = Target.getDoubleAlign(); 763 break; 764 case BuiltinType::LongDouble: 765 Width = Target.getLongDoubleWidth(); 766 Align = Target.getLongDoubleAlign(); 767 break; 768 case BuiltinType::NullPtr: 769 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 770 Align = Target.getPointerAlign(0); // == sizeof(void*) 771 break; 772 case BuiltinType::ObjCId: 773 case BuiltinType::ObjCClass: 774 case BuiltinType::ObjCSel: 775 Width = Target.getPointerWidth(0); 776 Align = Target.getPointerAlign(0); 777 break; 778 } 779 break; 780 case Type::ObjCObjectPointer: 781 Width = Target.getPointerWidth(0); 782 Align = Target.getPointerAlign(0); 783 break; 784 case Type::BlockPointer: { 785 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 786 Width = Target.getPointerWidth(AS); 787 Align = Target.getPointerAlign(AS); 788 break; 789 } 790 case Type::LValueReference: 791 case Type::RValueReference: { 792 // alignof and sizeof should never enter this code path here, so we go 793 // the pointer route. 794 unsigned AS = cast<ReferenceType>(T)->getPointeeType().getAddressSpace(); 795 Width = Target.getPointerWidth(AS); 796 Align = Target.getPointerAlign(AS); 797 break; 798 } 799 case Type::Pointer: { 800 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 801 Width = Target.getPointerWidth(AS); 802 Align = Target.getPointerAlign(AS); 803 break; 804 } 805 case Type::MemberPointer: { 806 const MemberPointerType *MPT = cast<MemberPointerType>(T); 807 std::pair<uint64_t, unsigned> PtrDiffInfo = 808 getTypeInfo(getPointerDiffType()); 809 Width = PtrDiffInfo.first * ABI->getMemberPointerSize(MPT); 810 Align = PtrDiffInfo.second; 811 break; 812 } 813 case Type::Complex: { 814 // Complex types have the same alignment as their elements, but twice the 815 // size. 816 std::pair<uint64_t, unsigned> EltInfo = 817 getTypeInfo(cast<ComplexType>(T)->getElementType()); 818 Width = EltInfo.first*2; 819 Align = EltInfo.second; 820 break; 821 } 822 case Type::ObjCObject: 823 return getTypeInfo(cast<ObjCObjectType>(T)->getBaseType().getTypePtr()); 824 case Type::ObjCInterface: { 825 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 826 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 827 Width = Layout.getSize(); 828 Align = Layout.getAlignment(); 829 break; 830 } 831 case Type::Record: 832 case Type::Enum: { 833 const TagType *TT = cast<TagType>(T); 834 835 if (TT->getDecl()->isInvalidDecl()) { 836 Width = 1; 837 Align = 1; 838 break; 839 } 840 841 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 842 return getTypeInfo(ET->getDecl()->getIntegerType()); 843 844 const RecordType *RT = cast<RecordType>(TT); 845 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 846 Width = Layout.getSize(); 847 Align = Layout.getAlignment(); 848 break; 849 } 850 851 case Type::SubstTemplateTypeParm: 852 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 853 getReplacementType().getTypePtr()); 854 855 case Type::Paren: 856 return getTypeInfo(cast<ParenType>(T)->getInnerType().getTypePtr()); 857 858 case Type::Typedef: { 859 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 860 std::pair<uint64_t, unsigned> Info 861 = getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 862 Align = std::max(Typedef->getMaxAlignment(), Info.second); 863 Width = Info.first; 864 break; 865 } 866 867 case Type::TypeOfExpr: 868 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 869 .getTypePtr()); 870 871 case Type::TypeOf: 872 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 873 874 case Type::Decltype: 875 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 876 .getTypePtr()); 877 878 case Type::Elaborated: 879 return getTypeInfo(cast<ElaboratedType>(T)->getNamedType().getTypePtr()); 880 881 case Type::Attributed: 882 return getTypeInfo( 883 cast<AttributedType>(T)->getEquivalentType().getTypePtr()); 884 885 case Type::TemplateSpecialization: 886 assert(getCanonicalType(T) != T && 887 "Cannot request the size of a dependent type"); 888 // FIXME: this is likely to be wrong once we support template 889 // aliases, since a template alias could refer to a typedef that 890 // has an __aligned__ attribute on it. 891 return getTypeInfo(getCanonicalType(T)); 892 } 893 894 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 895 return std::make_pair(Width, Align); 896} 897 898/// toCharUnitsFromBits - Convert a size in bits to a size in characters. 899CharUnits ASTContext::toCharUnitsFromBits(int64_t BitSize) const { 900 return CharUnits::fromQuantity(BitSize / getCharWidth()); 901} 902 903/// getTypeSizeInChars - Return the size of the specified type, in characters. 904/// This method does not work on incomplete types. 905CharUnits ASTContext::getTypeSizeInChars(QualType T) const { 906 return toCharUnitsFromBits(getTypeSize(T)); 907} 908CharUnits ASTContext::getTypeSizeInChars(const Type *T) const { 909 return toCharUnitsFromBits(getTypeSize(T)); 910} 911 912/// getTypeAlignInChars - Return the ABI-specified alignment of a type, in 913/// characters. This method does not work on incomplete types. 914CharUnits ASTContext::getTypeAlignInChars(QualType T) const { 915 return toCharUnitsFromBits(getTypeAlign(T)); 916} 917CharUnits ASTContext::getTypeAlignInChars(const Type *T) const { 918 return toCharUnitsFromBits(getTypeAlign(T)); 919} 920 921/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 922/// type for the current target in bits. This can be different than the ABI 923/// alignment in cases where it is beneficial for performance to overalign 924/// a data type. 925unsigned ASTContext::getPreferredTypeAlign(const Type *T) const { 926 unsigned ABIAlign = getTypeAlign(T); 927 928 // Double and long long should be naturally aligned if possible. 929 if (const ComplexType* CT = T->getAs<ComplexType>()) 930 T = CT->getElementType().getTypePtr(); 931 if (T->isSpecificBuiltinType(BuiltinType::Double) || 932 T->isSpecificBuiltinType(BuiltinType::LongLong)) 933 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 934 935 return ABIAlign; 936} 937 938/// ShallowCollectObjCIvars - 939/// Collect all ivars, including those synthesized, in the current class. 940/// 941void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 942 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) const { 943 // FIXME. This need be removed but there are two many places which 944 // assume const-ness of ObjCInterfaceDecl 945 ObjCInterfaceDecl *IDecl = const_cast<ObjCInterfaceDecl *>(OI); 946 for (ObjCIvarDecl *Iv = IDecl->all_declared_ivar_begin(); Iv; 947 Iv= Iv->getNextIvar()) 948 Ivars.push_back(Iv); 949} 950 951/// DeepCollectObjCIvars - 952/// This routine first collects all declared, but not synthesized, ivars in 953/// super class and then collects all ivars, including those synthesized for 954/// current class. This routine is used for implementation of current class 955/// when all ivars, declared and synthesized are known. 956/// 957void ASTContext::DeepCollectObjCIvars(const ObjCInterfaceDecl *OI, 958 bool leafClass, 959 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) const { 960 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 961 DeepCollectObjCIvars(SuperClass, false, Ivars); 962 if (!leafClass) { 963 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 964 E = OI->ivar_end(); I != E; ++I) 965 Ivars.push_back(*I); 966 } 967 else 968 ShallowCollectObjCIvars(OI, Ivars); 969} 970 971/// CollectInheritedProtocols - Collect all protocols in current class and 972/// those inherited by it. 973void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 974 llvm::SmallPtrSet<ObjCProtocolDecl*, 8> &Protocols) { 975 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 976 // We can use protocol_iterator here instead of 977 // all_referenced_protocol_iterator since we are walking all categories. 978 for (ObjCInterfaceDecl::all_protocol_iterator P = OI->all_referenced_protocol_begin(), 979 PE = OI->all_referenced_protocol_end(); P != PE; ++P) { 980 ObjCProtocolDecl *Proto = (*P); 981 Protocols.insert(Proto); 982 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 983 PE = Proto->protocol_end(); P != PE; ++P) { 984 Protocols.insert(*P); 985 CollectInheritedProtocols(*P, Protocols); 986 } 987 } 988 989 // Categories of this Interface. 990 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 991 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 992 CollectInheritedProtocols(CDeclChain, Protocols); 993 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 994 while (SD) { 995 CollectInheritedProtocols(SD, Protocols); 996 SD = SD->getSuperClass(); 997 } 998 } else if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 999 for (ObjCCategoryDecl::protocol_iterator P = OC->protocol_begin(), 1000 PE = OC->protocol_end(); P != PE; ++P) { 1001 ObjCProtocolDecl *Proto = (*P); 1002 Protocols.insert(Proto); 1003 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1004 PE = Proto->protocol_end(); P != PE; ++P) 1005 CollectInheritedProtocols(*P, Protocols); 1006 } 1007 } else if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 1008 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 1009 PE = OP->protocol_end(); P != PE; ++P) { 1010 ObjCProtocolDecl *Proto = (*P); 1011 Protocols.insert(Proto); 1012 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1013 PE = Proto->protocol_end(); P != PE; ++P) 1014 CollectInheritedProtocols(*P, Protocols); 1015 } 1016 } 1017} 1018 1019unsigned ASTContext::CountNonClassIvars(const ObjCInterfaceDecl *OI) const { 1020 unsigned count = 0; 1021 // Count ivars declared in class extension. 1022 for (const ObjCCategoryDecl *CDecl = OI->getFirstClassExtension(); CDecl; 1023 CDecl = CDecl->getNextClassExtension()) 1024 count += CDecl->ivar_size(); 1025 1026 // Count ivar defined in this class's implementation. This 1027 // includes synthesized ivars. 1028 if (ObjCImplementationDecl *ImplDecl = OI->getImplementation()) 1029 count += ImplDecl->ivar_size(); 1030 1031 return count; 1032} 1033 1034/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 1035ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 1036 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 1037 I = ObjCImpls.find(D); 1038 if (I != ObjCImpls.end()) 1039 return cast<ObjCImplementationDecl>(I->second); 1040 return 0; 1041} 1042/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 1043ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 1044 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 1045 I = ObjCImpls.find(D); 1046 if (I != ObjCImpls.end()) 1047 return cast<ObjCCategoryImplDecl>(I->second); 1048 return 0; 1049} 1050 1051/// \brief Set the implementation of ObjCInterfaceDecl. 1052void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 1053 ObjCImplementationDecl *ImplD) { 1054 assert(IFaceD && ImplD && "Passed null params"); 1055 ObjCImpls[IFaceD] = ImplD; 1056} 1057/// \brief Set the implementation of ObjCCategoryDecl. 1058void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 1059 ObjCCategoryImplDecl *ImplD) { 1060 assert(CatD && ImplD && "Passed null params"); 1061 ObjCImpls[CatD] = ImplD; 1062} 1063 1064/// \brief Get the copy initialization expression of VarDecl,or NULL if 1065/// none exists. 1066Expr *ASTContext::getBlockVarCopyInits(const VarDecl*VD) { 1067 assert(VD && "Passed null params"); 1068 assert(VD->hasAttr<BlocksAttr>() && 1069 "getBlockVarCopyInits - not __block var"); 1070 llvm::DenseMap<const VarDecl*, Expr*>::iterator 1071 I = BlockVarCopyInits.find(VD); 1072 return (I != BlockVarCopyInits.end()) ? cast<Expr>(I->second) : 0; 1073} 1074 1075/// \brief Set the copy inialization expression of a block var decl. 1076void ASTContext::setBlockVarCopyInits(VarDecl*VD, Expr* Init) { 1077 assert(VD && Init && "Passed null params"); 1078 assert(VD->hasAttr<BlocksAttr>() && 1079 "setBlockVarCopyInits - not __block var"); 1080 BlockVarCopyInits[VD] = Init; 1081} 1082 1083/// \brief Allocate an uninitialized TypeSourceInfo. 1084/// 1085/// The caller should initialize the memory held by TypeSourceInfo using 1086/// the TypeLoc wrappers. 1087/// 1088/// \param T the type that will be the basis for type source info. This type 1089/// should refer to how the declarator was written in source code, not to 1090/// what type semantic analysis resolved the declarator to. 1091TypeSourceInfo *ASTContext::CreateTypeSourceInfo(QualType T, 1092 unsigned DataSize) const { 1093 if (!DataSize) 1094 DataSize = TypeLoc::getFullDataSizeForType(T); 1095 else 1096 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 1097 "incorrect data size provided to CreateTypeSourceInfo!"); 1098 1099 TypeSourceInfo *TInfo = 1100 (TypeSourceInfo*)BumpAlloc.Allocate(sizeof(TypeSourceInfo) + DataSize, 8); 1101 new (TInfo) TypeSourceInfo(T); 1102 return TInfo; 1103} 1104 1105TypeSourceInfo *ASTContext::getTrivialTypeSourceInfo(QualType T, 1106 SourceLocation L) const { 1107 TypeSourceInfo *DI = CreateTypeSourceInfo(T); 1108 DI->getTypeLoc().initialize(L); 1109 return DI; 1110} 1111 1112const ASTRecordLayout & 1113ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) const { 1114 return getObjCLayout(D, 0); 1115} 1116 1117const ASTRecordLayout & 1118ASTContext::getASTObjCImplementationLayout( 1119 const ObjCImplementationDecl *D) const { 1120 return getObjCLayout(D->getClassInterface(), D); 1121} 1122 1123//===----------------------------------------------------------------------===// 1124// Type creation/memoization methods 1125//===----------------------------------------------------------------------===// 1126 1127QualType 1128ASTContext::getExtQualType(const Type *baseType, Qualifiers quals) const { 1129 unsigned fastQuals = quals.getFastQualifiers(); 1130 quals.removeFastQualifiers(); 1131 1132 // Check if we've already instantiated this type. 1133 llvm::FoldingSetNodeID ID; 1134 ExtQuals::Profile(ID, baseType, quals); 1135 void *insertPos = 0; 1136 if (ExtQuals *eq = ExtQualNodes.FindNodeOrInsertPos(ID, insertPos)) { 1137 assert(eq->getQualifiers() == quals); 1138 return QualType(eq, fastQuals); 1139 } 1140 1141 // If the base type is not canonical, make the appropriate canonical type. 1142 QualType canon; 1143 if (!baseType->isCanonicalUnqualified()) { 1144 SplitQualType canonSplit = baseType->getCanonicalTypeInternal().split(); 1145 canonSplit.second.addConsistentQualifiers(quals); 1146 canon = getExtQualType(canonSplit.first, canonSplit.second); 1147 1148 // Re-find the insert position. 1149 (void) ExtQualNodes.FindNodeOrInsertPos(ID, insertPos); 1150 } 1151 1152 ExtQuals *eq = new (*this, TypeAlignment) ExtQuals(baseType, canon, quals); 1153 ExtQualNodes.InsertNode(eq, insertPos); 1154 return QualType(eq, fastQuals); 1155} 1156 1157QualType 1158ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) const { 1159 QualType CanT = getCanonicalType(T); 1160 if (CanT.getAddressSpace() == AddressSpace) 1161 return T; 1162 1163 // If we are composing extended qualifiers together, merge together 1164 // into one ExtQuals node. 1165 QualifierCollector Quals; 1166 const Type *TypeNode = Quals.strip(T); 1167 1168 // If this type already has an address space specified, it cannot get 1169 // another one. 1170 assert(!Quals.hasAddressSpace() && 1171 "Type cannot be in multiple addr spaces!"); 1172 Quals.addAddressSpace(AddressSpace); 1173 1174 return getExtQualType(TypeNode, Quals); 1175} 1176 1177QualType ASTContext::getObjCGCQualType(QualType T, 1178 Qualifiers::GC GCAttr) const { 1179 QualType CanT = getCanonicalType(T); 1180 if (CanT.getObjCGCAttr() == GCAttr) 1181 return T; 1182 1183 if (const PointerType *ptr = T->getAs<PointerType>()) { 1184 QualType Pointee = ptr->getPointeeType(); 1185 if (Pointee->isAnyPointerType()) { 1186 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1187 return getPointerType(ResultType); 1188 } 1189 } 1190 1191 // If we are composing extended qualifiers together, merge together 1192 // into one ExtQuals node. 1193 QualifierCollector Quals; 1194 const Type *TypeNode = Quals.strip(T); 1195 1196 // If this type already has an ObjCGC specified, it cannot get 1197 // another one. 1198 assert(!Quals.hasObjCGCAttr() && 1199 "Type cannot have multiple ObjCGCs!"); 1200 Quals.addObjCGCAttr(GCAttr); 1201 1202 return getExtQualType(TypeNode, Quals); 1203} 1204 1205const FunctionType *ASTContext::adjustFunctionType(const FunctionType *T, 1206 FunctionType::ExtInfo Info) { 1207 if (T->getExtInfo() == Info) 1208 return T; 1209 1210 QualType Result; 1211 if (const FunctionNoProtoType *FNPT = dyn_cast<FunctionNoProtoType>(T)) { 1212 Result = getFunctionNoProtoType(FNPT->getResultType(), Info); 1213 } else { 1214 const FunctionProtoType *FPT = cast<FunctionProtoType>(T); 1215 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 1216 EPI.ExtInfo = Info; 1217 Result = getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 1218 FPT->getNumArgs(), EPI); 1219 } 1220 1221 return cast<FunctionType>(Result.getTypePtr()); 1222} 1223 1224/// getComplexType - Return the uniqued reference to the type for a complex 1225/// number with the specified element type. 1226QualType ASTContext::getComplexType(QualType T) const { 1227 // Unique pointers, to guarantee there is only one pointer of a particular 1228 // structure. 1229 llvm::FoldingSetNodeID ID; 1230 ComplexType::Profile(ID, T); 1231 1232 void *InsertPos = 0; 1233 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1234 return QualType(CT, 0); 1235 1236 // If the pointee type isn't canonical, this won't be a canonical type either, 1237 // so fill in the canonical type field. 1238 QualType Canonical; 1239 if (!T.isCanonical()) { 1240 Canonical = getComplexType(getCanonicalType(T)); 1241 1242 // Get the new insert position for the node we care about. 1243 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1244 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1245 } 1246 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1247 Types.push_back(New); 1248 ComplexTypes.InsertNode(New, InsertPos); 1249 return QualType(New, 0); 1250} 1251 1252/// getPointerType - Return the uniqued reference to the type for a pointer to 1253/// the specified type. 1254QualType ASTContext::getPointerType(QualType T) const { 1255 // Unique pointers, to guarantee there is only one pointer of a particular 1256 // structure. 1257 llvm::FoldingSetNodeID ID; 1258 PointerType::Profile(ID, T); 1259 1260 void *InsertPos = 0; 1261 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1262 return QualType(PT, 0); 1263 1264 // If the pointee type isn't canonical, this won't be a canonical type either, 1265 // so fill in the canonical type field. 1266 QualType Canonical; 1267 if (!T.isCanonical()) { 1268 Canonical = getPointerType(getCanonicalType(T)); 1269 1270 // Get the new insert position for the node we care about. 1271 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1272 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1273 } 1274 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1275 Types.push_back(New); 1276 PointerTypes.InsertNode(New, InsertPos); 1277 return QualType(New, 0); 1278} 1279 1280/// getBlockPointerType - Return the uniqued reference to the type for 1281/// a pointer to the specified block. 1282QualType ASTContext::getBlockPointerType(QualType T) const { 1283 assert(T->isFunctionType() && "block of function types only"); 1284 // Unique pointers, to guarantee there is only one block of a particular 1285 // structure. 1286 llvm::FoldingSetNodeID ID; 1287 BlockPointerType::Profile(ID, T); 1288 1289 void *InsertPos = 0; 1290 if (BlockPointerType *PT = 1291 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1292 return QualType(PT, 0); 1293 1294 // If the block pointee type isn't canonical, this won't be a canonical 1295 // type either so fill in the canonical type field. 1296 QualType Canonical; 1297 if (!T.isCanonical()) { 1298 Canonical = getBlockPointerType(getCanonicalType(T)); 1299 1300 // Get the new insert position for the node we care about. 1301 BlockPointerType *NewIP = 1302 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1303 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1304 } 1305 BlockPointerType *New 1306 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1307 Types.push_back(New); 1308 BlockPointerTypes.InsertNode(New, InsertPos); 1309 return QualType(New, 0); 1310} 1311 1312/// getLValueReferenceType - Return the uniqued reference to the type for an 1313/// lvalue reference to the specified type. 1314QualType 1315ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) const { 1316 // Unique pointers, to guarantee there is only one pointer of a particular 1317 // structure. 1318 llvm::FoldingSetNodeID ID; 1319 ReferenceType::Profile(ID, T, SpelledAsLValue); 1320 1321 void *InsertPos = 0; 1322 if (LValueReferenceType *RT = 1323 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1324 return QualType(RT, 0); 1325 1326 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1327 1328 // If the referencee type isn't canonical, this won't be a canonical type 1329 // either, so fill in the canonical type field. 1330 QualType Canonical; 1331 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1332 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1333 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1334 1335 // Get the new insert position for the node we care about. 1336 LValueReferenceType *NewIP = 1337 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1338 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1339 } 1340 1341 LValueReferenceType *New 1342 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1343 SpelledAsLValue); 1344 Types.push_back(New); 1345 LValueReferenceTypes.InsertNode(New, InsertPos); 1346 1347 return QualType(New, 0); 1348} 1349 1350/// getRValueReferenceType - Return the uniqued reference to the type for an 1351/// rvalue reference to the specified type. 1352QualType ASTContext::getRValueReferenceType(QualType T) const { 1353 // Unique pointers, to guarantee there is only one pointer of a particular 1354 // structure. 1355 llvm::FoldingSetNodeID ID; 1356 ReferenceType::Profile(ID, T, false); 1357 1358 void *InsertPos = 0; 1359 if (RValueReferenceType *RT = 1360 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1361 return QualType(RT, 0); 1362 1363 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1364 1365 // If the referencee type isn't canonical, this won't be a canonical type 1366 // either, so fill in the canonical type field. 1367 QualType Canonical; 1368 if (InnerRef || !T.isCanonical()) { 1369 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1370 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1371 1372 // Get the new insert position for the node we care about. 1373 RValueReferenceType *NewIP = 1374 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1375 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1376 } 1377 1378 RValueReferenceType *New 1379 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1380 Types.push_back(New); 1381 RValueReferenceTypes.InsertNode(New, InsertPos); 1382 return QualType(New, 0); 1383} 1384 1385/// getMemberPointerType - Return the uniqued reference to the type for a 1386/// member pointer to the specified type, in the specified class. 1387QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) const { 1388 // Unique pointers, to guarantee there is only one pointer of a particular 1389 // structure. 1390 llvm::FoldingSetNodeID ID; 1391 MemberPointerType::Profile(ID, T, Cls); 1392 1393 void *InsertPos = 0; 1394 if (MemberPointerType *PT = 1395 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1396 return QualType(PT, 0); 1397 1398 // If the pointee or class type isn't canonical, this won't be a canonical 1399 // type either, so fill in the canonical type field. 1400 QualType Canonical; 1401 if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) { 1402 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1403 1404 // Get the new insert position for the node we care about. 1405 MemberPointerType *NewIP = 1406 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1407 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1408 } 1409 MemberPointerType *New 1410 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1411 Types.push_back(New); 1412 MemberPointerTypes.InsertNode(New, InsertPos); 1413 return QualType(New, 0); 1414} 1415 1416/// getConstantArrayType - Return the unique reference to the type for an 1417/// array of the specified element type. 1418QualType ASTContext::getConstantArrayType(QualType EltTy, 1419 const llvm::APInt &ArySizeIn, 1420 ArrayType::ArraySizeModifier ASM, 1421 unsigned EltTypeQuals) const { 1422 assert((EltTy->isDependentType() || 1423 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1424 "Constant array of VLAs is illegal!"); 1425 1426 // Convert the array size into a canonical width matching the pointer size for 1427 // the target. 1428 llvm::APInt ArySize(ArySizeIn); 1429 ArySize = 1430 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1431 1432 llvm::FoldingSetNodeID ID; 1433 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1434 1435 void *InsertPos = 0; 1436 if (ConstantArrayType *ATP = 1437 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1438 return QualType(ATP, 0); 1439 1440 // If the element type isn't canonical or has qualifiers, this won't 1441 // be a canonical type either, so fill in the canonical type field. 1442 QualType Canon; 1443 if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) { 1444 SplitQualType canonSplit = getCanonicalType(EltTy).split(); 1445 Canon = getConstantArrayType(QualType(canonSplit.first, 0), ArySize, 1446 ASM, EltTypeQuals); 1447 Canon = getQualifiedType(Canon, canonSplit.second); 1448 1449 // Get the new insert position for the node we care about. 1450 ConstantArrayType *NewIP = 1451 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1452 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1453 } 1454 1455 ConstantArrayType *New = new(*this,TypeAlignment) 1456 ConstantArrayType(EltTy, Canon, ArySize, ASM, EltTypeQuals); 1457 ConstantArrayTypes.InsertNode(New, InsertPos); 1458 Types.push_back(New); 1459 return QualType(New, 0); 1460} 1461 1462/// getVariableArrayDecayedType - Turns the given type, which may be 1463/// variably-modified, into the corresponding type with all the known 1464/// sizes replaced with [*]. 1465QualType ASTContext::getVariableArrayDecayedType(QualType type) const { 1466 // Vastly most common case. 1467 if (!type->isVariablyModifiedType()) return type; 1468 1469 QualType result; 1470 1471 SplitQualType split = type.getSplitDesugaredType(); 1472 const Type *ty = split.first; 1473 switch (ty->getTypeClass()) { 1474#define TYPE(Class, Base) 1475#define ABSTRACT_TYPE(Class, Base) 1476#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 1477#include "clang/AST/TypeNodes.def" 1478 llvm_unreachable("didn't desugar past all non-canonical types?"); 1479 1480 // These types should never be variably-modified. 1481 case Type::Builtin: 1482 case Type::Complex: 1483 case Type::Vector: 1484 case Type::ExtVector: 1485 case Type::DependentSizedExtVector: 1486 case Type::ObjCObject: 1487 case Type::ObjCInterface: 1488 case Type::ObjCObjectPointer: 1489 case Type::Record: 1490 case Type::Enum: 1491 case Type::UnresolvedUsing: 1492 case Type::TypeOfExpr: 1493 case Type::TypeOf: 1494 case Type::Decltype: 1495 case Type::DependentName: 1496 case Type::InjectedClassName: 1497 case Type::TemplateSpecialization: 1498 case Type::DependentTemplateSpecialization: 1499 case Type::TemplateTypeParm: 1500 case Type::SubstTemplateTypeParmPack: 1501 case Type::PackExpansion: 1502 llvm_unreachable("type should never be variably-modified"); 1503 1504 // These types can be variably-modified but should never need to 1505 // further decay. 1506 case Type::FunctionNoProto: 1507 case Type::FunctionProto: 1508 case Type::BlockPointer: 1509 case Type::MemberPointer: 1510 return type; 1511 1512 // These types can be variably-modified. All these modifications 1513 // preserve structure except as noted by comments. 1514 // TODO: if we ever care about optimizing VLAs, there are no-op 1515 // optimizations available here. 1516 case Type::Pointer: 1517 result = getPointerType(getVariableArrayDecayedType( 1518 cast<PointerType>(ty)->getPointeeType())); 1519 break; 1520 1521 case Type::LValueReference: { 1522 const LValueReferenceType *lv = cast<LValueReferenceType>(ty); 1523 result = getLValueReferenceType( 1524 getVariableArrayDecayedType(lv->getPointeeType()), 1525 lv->isSpelledAsLValue()); 1526 break; 1527 } 1528 1529 case Type::RValueReference: { 1530 const RValueReferenceType *lv = cast<RValueReferenceType>(ty); 1531 result = getRValueReferenceType( 1532 getVariableArrayDecayedType(lv->getPointeeType())); 1533 break; 1534 } 1535 1536 case Type::ConstantArray: { 1537 const ConstantArrayType *cat = cast<ConstantArrayType>(ty); 1538 result = getConstantArrayType( 1539 getVariableArrayDecayedType(cat->getElementType()), 1540 cat->getSize(), 1541 cat->getSizeModifier(), 1542 cat->getIndexTypeCVRQualifiers()); 1543 break; 1544 } 1545 1546 case Type::DependentSizedArray: { 1547 const DependentSizedArrayType *dat = cast<DependentSizedArrayType>(ty); 1548 result = getDependentSizedArrayType( 1549 getVariableArrayDecayedType(dat->getElementType()), 1550 dat->getSizeExpr(), 1551 dat->getSizeModifier(), 1552 dat->getIndexTypeCVRQualifiers(), 1553 dat->getBracketsRange()); 1554 break; 1555 } 1556 1557 // Turn incomplete types into [*] types. 1558 case Type::IncompleteArray: { 1559 const IncompleteArrayType *iat = cast<IncompleteArrayType>(ty); 1560 result = getVariableArrayType( 1561 getVariableArrayDecayedType(iat->getElementType()), 1562 /*size*/ 0, 1563 ArrayType::Normal, 1564 iat->getIndexTypeCVRQualifiers(), 1565 SourceRange()); 1566 break; 1567 } 1568 1569 // Turn VLA types into [*] types. 1570 case Type::VariableArray: { 1571 const VariableArrayType *vat = cast<VariableArrayType>(ty); 1572 result = getVariableArrayType( 1573 getVariableArrayDecayedType(vat->getElementType()), 1574 /*size*/ 0, 1575 ArrayType::Star, 1576 vat->getIndexTypeCVRQualifiers(), 1577 vat->getBracketsRange()); 1578 break; 1579 } 1580 } 1581 1582 // Apply the top-level qualifiers from the original. 1583 return getQualifiedType(result, split.second); 1584} 1585 1586/// getVariableArrayType - Returns a non-unique reference to the type for a 1587/// variable array of the specified element type. 1588QualType ASTContext::getVariableArrayType(QualType EltTy, 1589 Expr *NumElts, 1590 ArrayType::ArraySizeModifier ASM, 1591 unsigned EltTypeQuals, 1592 SourceRange Brackets) const { 1593 // Since we don't unique expressions, it isn't possible to unique VLA's 1594 // that have an expression provided for their size. 1595 QualType Canon; 1596 1597 // Be sure to pull qualifiers off the element type. 1598 if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) { 1599 SplitQualType canonSplit = getCanonicalType(EltTy).split(); 1600 Canon = getVariableArrayType(QualType(canonSplit.first, 0), NumElts, ASM, 1601 EltTypeQuals, Brackets); 1602 Canon = getQualifiedType(Canon, canonSplit.second); 1603 } 1604 1605 VariableArrayType *New = new(*this, TypeAlignment) 1606 VariableArrayType(EltTy, Canon, NumElts, ASM, EltTypeQuals, Brackets); 1607 1608 VariableArrayTypes.push_back(New); 1609 Types.push_back(New); 1610 return QualType(New, 0); 1611} 1612 1613/// getDependentSizedArrayType - Returns a non-unique reference to 1614/// the type for a dependently-sized array of the specified element 1615/// type. 1616QualType ASTContext::getDependentSizedArrayType(QualType elementType, 1617 Expr *numElements, 1618 ArrayType::ArraySizeModifier ASM, 1619 unsigned elementTypeQuals, 1620 SourceRange brackets) const { 1621 assert((!numElements || numElements->isTypeDependent() || 1622 numElements->isValueDependent()) && 1623 "Size must be type- or value-dependent!"); 1624 1625 // Dependently-sized array types that do not have a specified number 1626 // of elements will have their sizes deduced from a dependent 1627 // initializer. We do no canonicalization here at all, which is okay 1628 // because they can't be used in most locations. 1629 if (!numElements) { 1630 DependentSizedArrayType *newType 1631 = new (*this, TypeAlignment) 1632 DependentSizedArrayType(*this, elementType, QualType(), 1633 numElements, ASM, elementTypeQuals, 1634 brackets); 1635 Types.push_back(newType); 1636 return QualType(newType, 0); 1637 } 1638 1639 // Otherwise, we actually build a new type every time, but we 1640 // also build a canonical type. 1641 1642 SplitQualType canonElementType = getCanonicalType(elementType).split(); 1643 1644 void *insertPos = 0; 1645 llvm::FoldingSetNodeID ID; 1646 DependentSizedArrayType::Profile(ID, *this, 1647 QualType(canonElementType.first, 0), 1648 ASM, elementTypeQuals, numElements); 1649 1650 // Look for an existing type with these properties. 1651 DependentSizedArrayType *canonTy = 1652 DependentSizedArrayTypes.FindNodeOrInsertPos(ID, insertPos); 1653 1654 // If we don't have one, build one. 1655 if (!canonTy) { 1656 canonTy = new (*this, TypeAlignment) 1657 DependentSizedArrayType(*this, QualType(canonElementType.first, 0), 1658 QualType(), numElements, ASM, elementTypeQuals, 1659 brackets); 1660 DependentSizedArrayTypes.InsertNode(canonTy, insertPos); 1661 Types.push_back(canonTy); 1662 } 1663 1664 // Apply qualifiers from the element type to the array. 1665 QualType canon = getQualifiedType(QualType(canonTy,0), 1666 canonElementType.second); 1667 1668 // If we didn't need extra canonicalization for the element type, 1669 // then just use that as our result. 1670 if (QualType(canonElementType.first, 0) == elementType) 1671 return canon; 1672 1673 // Otherwise, we need to build a type which follows the spelling 1674 // of the element type. 1675 DependentSizedArrayType *sugaredType 1676 = new (*this, TypeAlignment) 1677 DependentSizedArrayType(*this, elementType, canon, numElements, 1678 ASM, elementTypeQuals, brackets); 1679 Types.push_back(sugaredType); 1680 return QualType(sugaredType, 0); 1681} 1682 1683QualType ASTContext::getIncompleteArrayType(QualType elementType, 1684 ArrayType::ArraySizeModifier ASM, 1685 unsigned elementTypeQuals) const { 1686 llvm::FoldingSetNodeID ID; 1687 IncompleteArrayType::Profile(ID, elementType, ASM, elementTypeQuals); 1688 1689 void *insertPos = 0; 1690 if (IncompleteArrayType *iat = 1691 IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos)) 1692 return QualType(iat, 0); 1693 1694 // If the element type isn't canonical, this won't be a canonical type 1695 // either, so fill in the canonical type field. We also have to pull 1696 // qualifiers off the element type. 1697 QualType canon; 1698 1699 if (!elementType.isCanonical() || elementType.hasLocalQualifiers()) { 1700 SplitQualType canonSplit = getCanonicalType(elementType).split(); 1701 canon = getIncompleteArrayType(QualType(canonSplit.first, 0), 1702 ASM, elementTypeQuals); 1703 canon = getQualifiedType(canon, canonSplit.second); 1704 1705 // Get the new insert position for the node we care about. 1706 IncompleteArrayType *existing = 1707 IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos); 1708 assert(!existing && "Shouldn't be in the map!"); (void) existing; 1709 } 1710 1711 IncompleteArrayType *newType = new (*this, TypeAlignment) 1712 IncompleteArrayType(elementType, canon, ASM, elementTypeQuals); 1713 1714 IncompleteArrayTypes.InsertNode(newType, insertPos); 1715 Types.push_back(newType); 1716 return QualType(newType, 0); 1717} 1718 1719/// getVectorType - Return the unique reference to a vector type of 1720/// the specified element type and size. VectorType must be a built-in type. 1721QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts, 1722 VectorType::VectorKind VecKind) const { 1723 assert(vecType->isBuiltinType()); 1724 1725 // Check if we've already instantiated a vector of this type. 1726 llvm::FoldingSetNodeID ID; 1727 VectorType::Profile(ID, vecType, NumElts, Type::Vector, VecKind); 1728 1729 void *InsertPos = 0; 1730 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1731 return QualType(VTP, 0); 1732 1733 // If the element type isn't canonical, this won't be a canonical type either, 1734 // so fill in the canonical type field. 1735 QualType Canonical; 1736 if (!vecType.isCanonical()) { 1737 Canonical = getVectorType(getCanonicalType(vecType), NumElts, VecKind); 1738 1739 // Get the new insert position for the node we care about. 1740 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1741 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1742 } 1743 VectorType *New = new (*this, TypeAlignment) 1744 VectorType(vecType, NumElts, Canonical, VecKind); 1745 VectorTypes.InsertNode(New, InsertPos); 1746 Types.push_back(New); 1747 return QualType(New, 0); 1748} 1749 1750/// getExtVectorType - Return the unique reference to an extended vector type of 1751/// the specified element type and size. VectorType must be a built-in type. 1752QualType 1753ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) const { 1754 assert(vecType->isBuiltinType()); 1755 1756 // Check if we've already instantiated a vector of this type. 1757 llvm::FoldingSetNodeID ID; 1758 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector, 1759 VectorType::GenericVector); 1760 void *InsertPos = 0; 1761 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1762 return QualType(VTP, 0); 1763 1764 // If the element type isn't canonical, this won't be a canonical type either, 1765 // so fill in the canonical type field. 1766 QualType Canonical; 1767 if (!vecType.isCanonical()) { 1768 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1769 1770 // Get the new insert position for the node we care about. 1771 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1772 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1773 } 1774 ExtVectorType *New = new (*this, TypeAlignment) 1775 ExtVectorType(vecType, NumElts, Canonical); 1776 VectorTypes.InsertNode(New, InsertPos); 1777 Types.push_back(New); 1778 return QualType(New, 0); 1779} 1780 1781QualType 1782ASTContext::getDependentSizedExtVectorType(QualType vecType, 1783 Expr *SizeExpr, 1784 SourceLocation AttrLoc) const { 1785 llvm::FoldingSetNodeID ID; 1786 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1787 SizeExpr); 1788 1789 void *InsertPos = 0; 1790 DependentSizedExtVectorType *Canon 1791 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1792 DependentSizedExtVectorType *New; 1793 if (Canon) { 1794 // We already have a canonical version of this array type; use it as 1795 // the canonical type for a newly-built type. 1796 New = new (*this, TypeAlignment) 1797 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1798 SizeExpr, AttrLoc); 1799 } else { 1800 QualType CanonVecTy = getCanonicalType(vecType); 1801 if (CanonVecTy == vecType) { 1802 New = new (*this, TypeAlignment) 1803 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1804 AttrLoc); 1805 1806 DependentSizedExtVectorType *CanonCheck 1807 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1808 assert(!CanonCheck && "Dependent-sized ext_vector canonical type broken"); 1809 (void)CanonCheck; 1810 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1811 } else { 1812 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1813 SourceLocation()); 1814 New = new (*this, TypeAlignment) 1815 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1816 } 1817 } 1818 1819 Types.push_back(New); 1820 return QualType(New, 0); 1821} 1822 1823/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1824/// 1825QualType 1826ASTContext::getFunctionNoProtoType(QualType ResultTy, 1827 const FunctionType::ExtInfo &Info) const { 1828 const CallingConv CallConv = Info.getCC(); 1829 // Unique functions, to guarantee there is only one function of a particular 1830 // structure. 1831 llvm::FoldingSetNodeID ID; 1832 FunctionNoProtoType::Profile(ID, ResultTy, Info); 1833 1834 void *InsertPos = 0; 1835 if (FunctionNoProtoType *FT = 1836 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1837 return QualType(FT, 0); 1838 1839 QualType Canonical; 1840 if (!ResultTy.isCanonical() || 1841 getCanonicalCallConv(CallConv) != CallConv) { 1842 Canonical = 1843 getFunctionNoProtoType(getCanonicalType(ResultTy), 1844 Info.withCallingConv(getCanonicalCallConv(CallConv))); 1845 1846 // Get the new insert position for the node we care about. 1847 FunctionNoProtoType *NewIP = 1848 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1849 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1850 } 1851 1852 FunctionNoProtoType *New = new (*this, TypeAlignment) 1853 FunctionNoProtoType(ResultTy, Canonical, Info); 1854 Types.push_back(New); 1855 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1856 return QualType(New, 0); 1857} 1858 1859/// getFunctionType - Return a normal function type with a typed argument 1860/// list. isVariadic indicates whether the argument list includes '...'. 1861QualType 1862ASTContext::getFunctionType(QualType ResultTy, 1863 const QualType *ArgArray, unsigned NumArgs, 1864 const FunctionProtoType::ExtProtoInfo &EPI) const { 1865 // Unique functions, to guarantee there is only one function of a particular 1866 // structure. 1867 llvm::FoldingSetNodeID ID; 1868 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, EPI); 1869 1870 void *InsertPos = 0; 1871 if (FunctionProtoType *FTP = 1872 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1873 return QualType(FTP, 0); 1874 1875 // Determine whether the type being created is already canonical or not. 1876 bool isCanonical = !EPI.HasExceptionSpec && ResultTy.isCanonical(); 1877 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1878 if (!ArgArray[i].isCanonicalAsParam()) 1879 isCanonical = false; 1880 1881 const CallingConv CallConv = EPI.ExtInfo.getCC(); 1882 1883 // If this type isn't canonical, get the canonical version of it. 1884 // The exception spec is not part of the canonical type. 1885 QualType Canonical; 1886 if (!isCanonical || getCanonicalCallConv(CallConv) != CallConv) { 1887 llvm::SmallVector<QualType, 16> CanonicalArgs; 1888 CanonicalArgs.reserve(NumArgs); 1889 for (unsigned i = 0; i != NumArgs; ++i) 1890 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1891 1892 FunctionProtoType::ExtProtoInfo CanonicalEPI = EPI; 1893 if (CanonicalEPI.HasExceptionSpec) { 1894 CanonicalEPI.HasExceptionSpec = false; 1895 CanonicalEPI.HasAnyExceptionSpec = false; 1896 CanonicalEPI.NumExceptions = 0; 1897 } 1898 CanonicalEPI.ExtInfo 1899 = CanonicalEPI.ExtInfo.withCallingConv(getCanonicalCallConv(CallConv)); 1900 1901 Canonical = getFunctionType(getCanonicalType(ResultTy), 1902 CanonicalArgs.data(), NumArgs, 1903 CanonicalEPI); 1904 1905 // Get the new insert position for the node we care about. 1906 FunctionProtoType *NewIP = 1907 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1908 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1909 } 1910 1911 // FunctionProtoType objects are allocated with extra bytes after them 1912 // for two variable size arrays (for parameter and exception types) at the 1913 // end of them. 1914 size_t Size = sizeof(FunctionProtoType) + 1915 NumArgs * sizeof(QualType) + 1916 EPI.NumExceptions * sizeof(QualType); 1917 FunctionProtoType *FTP = (FunctionProtoType*) Allocate(Size, TypeAlignment); 1918 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, Canonical, EPI); 1919 Types.push_back(FTP); 1920 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1921 return QualType(FTP, 0); 1922} 1923 1924#ifndef NDEBUG 1925static bool NeedsInjectedClassNameType(const RecordDecl *D) { 1926 if (!isa<CXXRecordDecl>(D)) return false; 1927 const CXXRecordDecl *RD = cast<CXXRecordDecl>(D); 1928 if (isa<ClassTemplatePartialSpecializationDecl>(RD)) 1929 return true; 1930 if (RD->getDescribedClassTemplate() && 1931 !isa<ClassTemplateSpecializationDecl>(RD)) 1932 return true; 1933 return false; 1934} 1935#endif 1936 1937/// getInjectedClassNameType - Return the unique reference to the 1938/// injected class name type for the specified templated declaration. 1939QualType ASTContext::getInjectedClassNameType(CXXRecordDecl *Decl, 1940 QualType TST) const { 1941 assert(NeedsInjectedClassNameType(Decl)); 1942 if (Decl->TypeForDecl) { 1943 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1944 } else if (CXXRecordDecl *PrevDecl = Decl->getPreviousDeclaration()) { 1945 assert(PrevDecl->TypeForDecl && "previous declaration has no type"); 1946 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1947 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1948 } else { 1949 Type *newType = 1950 new (*this, TypeAlignment) InjectedClassNameType(Decl, TST); 1951 Decl->TypeForDecl = newType; 1952 Types.push_back(newType); 1953 } 1954 return QualType(Decl->TypeForDecl, 0); 1955} 1956 1957/// getTypeDeclType - Return the unique reference to the type for the 1958/// specified type declaration. 1959QualType ASTContext::getTypeDeclTypeSlow(const TypeDecl *Decl) const { 1960 assert(Decl && "Passed null for Decl param"); 1961 assert(!Decl->TypeForDecl && "TypeForDecl present in slow case"); 1962 1963 if (const TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1964 return getTypedefType(Typedef); 1965 1966 assert(!isa<TemplateTypeParmDecl>(Decl) && 1967 "Template type parameter types are always available."); 1968 1969 if (const RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1970 assert(!Record->getPreviousDeclaration() && 1971 "struct/union has previous declaration"); 1972 assert(!NeedsInjectedClassNameType(Record)); 1973 return getRecordType(Record); 1974 } else if (const EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1975 assert(!Enum->getPreviousDeclaration() && 1976 "enum has previous declaration"); 1977 return getEnumType(Enum); 1978 } else if (const UnresolvedUsingTypenameDecl *Using = 1979 dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) { 1980 Type *newType = new (*this, TypeAlignment) UnresolvedUsingType(Using); 1981 Decl->TypeForDecl = newType; 1982 Types.push_back(newType); 1983 } else 1984 llvm_unreachable("TypeDecl without a type?"); 1985 1986 return QualType(Decl->TypeForDecl, 0); 1987} 1988 1989/// getTypedefType - Return the unique reference to the type for the 1990/// specified typename decl. 1991QualType 1992ASTContext::getTypedefType(const TypedefDecl *Decl, QualType Canonical) const { 1993 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1994 1995 if (Canonical.isNull()) 1996 Canonical = getCanonicalType(Decl->getUnderlyingType()); 1997 TypedefType *newType = new(*this, TypeAlignment) 1998 TypedefType(Type::Typedef, Decl, Canonical); 1999 Decl->TypeForDecl = newType; 2000 Types.push_back(newType); 2001 return QualType(newType, 0); 2002} 2003 2004QualType ASTContext::getRecordType(const RecordDecl *Decl) const { 2005 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2006 2007 if (const RecordDecl *PrevDecl = Decl->getPreviousDeclaration()) 2008 if (PrevDecl->TypeForDecl) 2009 return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0); 2010 2011 RecordType *newType = new (*this, TypeAlignment) RecordType(Decl); 2012 Decl->TypeForDecl = newType; 2013 Types.push_back(newType); 2014 return QualType(newType, 0); 2015} 2016 2017QualType ASTContext::getEnumType(const EnumDecl *Decl) const { 2018 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2019 2020 if (const EnumDecl *PrevDecl = Decl->getPreviousDeclaration()) 2021 if (PrevDecl->TypeForDecl) 2022 return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0); 2023 2024 EnumType *newType = new (*this, TypeAlignment) EnumType(Decl); 2025 Decl->TypeForDecl = newType; 2026 Types.push_back(newType); 2027 return QualType(newType, 0); 2028} 2029 2030QualType ASTContext::getAttributedType(AttributedType::Kind attrKind, 2031 QualType modifiedType, 2032 QualType equivalentType) { 2033 llvm::FoldingSetNodeID id; 2034 AttributedType::Profile(id, attrKind, modifiedType, equivalentType); 2035 2036 void *insertPos = 0; 2037 AttributedType *type = AttributedTypes.FindNodeOrInsertPos(id, insertPos); 2038 if (type) return QualType(type, 0); 2039 2040 QualType canon = getCanonicalType(equivalentType); 2041 type = new (*this, TypeAlignment) 2042 AttributedType(canon, attrKind, modifiedType, equivalentType); 2043 2044 Types.push_back(type); 2045 AttributedTypes.InsertNode(type, insertPos); 2046 2047 return QualType(type, 0); 2048} 2049 2050 2051/// \brief Retrieve a substitution-result type. 2052QualType 2053ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 2054 QualType Replacement) const { 2055 assert(Replacement.isCanonical() 2056 && "replacement types must always be canonical"); 2057 2058 llvm::FoldingSetNodeID ID; 2059 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 2060 void *InsertPos = 0; 2061 SubstTemplateTypeParmType *SubstParm 2062 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2063 2064 if (!SubstParm) { 2065 SubstParm = new (*this, TypeAlignment) 2066 SubstTemplateTypeParmType(Parm, Replacement); 2067 Types.push_back(SubstParm); 2068 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 2069 } 2070 2071 return QualType(SubstParm, 0); 2072} 2073 2074/// \brief Retrieve a 2075QualType ASTContext::getSubstTemplateTypeParmPackType( 2076 const TemplateTypeParmType *Parm, 2077 const TemplateArgument &ArgPack) { 2078#ifndef NDEBUG 2079 for (TemplateArgument::pack_iterator P = ArgPack.pack_begin(), 2080 PEnd = ArgPack.pack_end(); 2081 P != PEnd; ++P) { 2082 assert(P->getKind() == TemplateArgument::Type &&"Pack contains a non-type"); 2083 assert(P->getAsType().isCanonical() && "Pack contains non-canonical type"); 2084 } 2085#endif 2086 2087 llvm::FoldingSetNodeID ID; 2088 SubstTemplateTypeParmPackType::Profile(ID, Parm, ArgPack); 2089 void *InsertPos = 0; 2090 if (SubstTemplateTypeParmPackType *SubstParm 2091 = SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos)) 2092 return QualType(SubstParm, 0); 2093 2094 QualType Canon; 2095 if (!Parm->isCanonicalUnqualified()) { 2096 Canon = getCanonicalType(QualType(Parm, 0)); 2097 Canon = getSubstTemplateTypeParmPackType(cast<TemplateTypeParmType>(Canon), 2098 ArgPack); 2099 SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos); 2100 } 2101 2102 SubstTemplateTypeParmPackType *SubstParm 2103 = new (*this, TypeAlignment) SubstTemplateTypeParmPackType(Parm, Canon, 2104 ArgPack); 2105 Types.push_back(SubstParm); 2106 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 2107 return QualType(SubstParm, 0); 2108} 2109 2110/// \brief Retrieve the template type parameter type for a template 2111/// parameter or parameter pack with the given depth, index, and (optionally) 2112/// name. 2113QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 2114 bool ParameterPack, 2115 IdentifierInfo *Name) const { 2116 llvm::FoldingSetNodeID ID; 2117 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 2118 void *InsertPos = 0; 2119 TemplateTypeParmType *TypeParm 2120 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2121 2122 if (TypeParm) 2123 return QualType(TypeParm, 0); 2124 2125 if (Name) { 2126 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 2127 TypeParm = new (*this, TypeAlignment) 2128 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 2129 2130 TemplateTypeParmType *TypeCheck 2131 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2132 assert(!TypeCheck && "Template type parameter canonical type broken"); 2133 (void)TypeCheck; 2134 } else 2135 TypeParm = new (*this, TypeAlignment) 2136 TemplateTypeParmType(Depth, Index, ParameterPack); 2137 2138 Types.push_back(TypeParm); 2139 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 2140 2141 return QualType(TypeParm, 0); 2142} 2143 2144TypeSourceInfo * 2145ASTContext::getTemplateSpecializationTypeInfo(TemplateName Name, 2146 SourceLocation NameLoc, 2147 const TemplateArgumentListInfo &Args, 2148 QualType CanonType) const { 2149 QualType TST = getTemplateSpecializationType(Name, Args, CanonType); 2150 2151 TypeSourceInfo *DI = CreateTypeSourceInfo(TST); 2152 TemplateSpecializationTypeLoc TL 2153 = cast<TemplateSpecializationTypeLoc>(DI->getTypeLoc()); 2154 TL.setTemplateNameLoc(NameLoc); 2155 TL.setLAngleLoc(Args.getLAngleLoc()); 2156 TL.setRAngleLoc(Args.getRAngleLoc()); 2157 for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i) 2158 TL.setArgLocInfo(i, Args[i].getLocInfo()); 2159 return DI; 2160} 2161 2162QualType 2163ASTContext::getTemplateSpecializationType(TemplateName Template, 2164 const TemplateArgumentListInfo &Args, 2165 QualType Canon) const { 2166 unsigned NumArgs = Args.size(); 2167 2168 llvm::SmallVector<TemplateArgument, 4> ArgVec; 2169 ArgVec.reserve(NumArgs); 2170 for (unsigned i = 0; i != NumArgs; ++i) 2171 ArgVec.push_back(Args[i].getArgument()); 2172 2173 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, 2174 Canon); 2175} 2176 2177QualType 2178ASTContext::getTemplateSpecializationType(TemplateName Template, 2179 const TemplateArgument *Args, 2180 unsigned NumArgs, 2181 QualType Canon) const { 2182 if (!Canon.isNull()) 2183 Canon = getCanonicalType(Canon); 2184 else 2185 Canon = getCanonicalTemplateSpecializationType(Template, Args, NumArgs); 2186 2187 // Allocate the (non-canonical) template specialization type, but don't 2188 // try to unique it: these types typically have location information that 2189 // we don't unique and don't want to lose. 2190 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 2191 sizeof(TemplateArgument) * NumArgs), 2192 TypeAlignment); 2193 TemplateSpecializationType *Spec 2194 = new (Mem) TemplateSpecializationType(Template, 2195 Args, NumArgs, 2196 Canon); 2197 2198 Types.push_back(Spec); 2199 return QualType(Spec, 0); 2200} 2201 2202QualType 2203ASTContext::getCanonicalTemplateSpecializationType(TemplateName Template, 2204 const TemplateArgument *Args, 2205 unsigned NumArgs) const { 2206 // Build the canonical template specialization type. 2207 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 2208 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 2209 CanonArgs.reserve(NumArgs); 2210 for (unsigned I = 0; I != NumArgs; ++I) 2211 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 2212 2213 // Determine whether this canonical template specialization type already 2214 // exists. 2215 llvm::FoldingSetNodeID ID; 2216 TemplateSpecializationType::Profile(ID, CanonTemplate, 2217 CanonArgs.data(), NumArgs, *this); 2218 2219 void *InsertPos = 0; 2220 TemplateSpecializationType *Spec 2221 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2222 2223 if (!Spec) { 2224 // Allocate a new canonical template specialization type. 2225 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 2226 sizeof(TemplateArgument) * NumArgs), 2227 TypeAlignment); 2228 Spec = new (Mem) TemplateSpecializationType(CanonTemplate, 2229 CanonArgs.data(), NumArgs, 2230 QualType()); 2231 Types.push_back(Spec); 2232 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 2233 } 2234 2235 assert(Spec->isDependentType() && 2236 "Non-dependent template-id type must have a canonical type"); 2237 return QualType(Spec, 0); 2238} 2239 2240QualType 2241ASTContext::getElaboratedType(ElaboratedTypeKeyword Keyword, 2242 NestedNameSpecifier *NNS, 2243 QualType NamedType) const { 2244 llvm::FoldingSetNodeID ID; 2245 ElaboratedType::Profile(ID, Keyword, NNS, NamedType); 2246 2247 void *InsertPos = 0; 2248 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2249 if (T) 2250 return QualType(T, 0); 2251 2252 QualType Canon = NamedType; 2253 if (!Canon.isCanonical()) { 2254 Canon = getCanonicalType(NamedType); 2255 ElaboratedType *CheckT = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2256 assert(!CheckT && "Elaborated canonical type broken"); 2257 (void)CheckT; 2258 } 2259 2260 T = new (*this) ElaboratedType(Keyword, NNS, NamedType, Canon); 2261 Types.push_back(T); 2262 ElaboratedTypes.InsertNode(T, InsertPos); 2263 return QualType(T, 0); 2264} 2265 2266QualType 2267ASTContext::getParenType(QualType InnerType) const { 2268 llvm::FoldingSetNodeID ID; 2269 ParenType::Profile(ID, InnerType); 2270 2271 void *InsertPos = 0; 2272 ParenType *T = ParenTypes.FindNodeOrInsertPos(ID, InsertPos); 2273 if (T) 2274 return QualType(T, 0); 2275 2276 QualType Canon = InnerType; 2277 if (!Canon.isCanonical()) { 2278 Canon = getCanonicalType(InnerType); 2279 ParenType *CheckT = ParenTypes.FindNodeOrInsertPos(ID, InsertPos); 2280 assert(!CheckT && "Paren canonical type broken"); 2281 (void)CheckT; 2282 } 2283 2284 T = new (*this) ParenType(InnerType, Canon); 2285 Types.push_back(T); 2286 ParenTypes.InsertNode(T, InsertPos); 2287 return QualType(T, 0); 2288} 2289 2290QualType ASTContext::getDependentNameType(ElaboratedTypeKeyword Keyword, 2291 NestedNameSpecifier *NNS, 2292 const IdentifierInfo *Name, 2293 QualType Canon) const { 2294 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 2295 2296 if (Canon.isNull()) { 2297 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2298 ElaboratedTypeKeyword CanonKeyword = Keyword; 2299 if (Keyword == ETK_None) 2300 CanonKeyword = ETK_Typename; 2301 2302 if (CanonNNS != NNS || CanonKeyword != Keyword) 2303 Canon = getDependentNameType(CanonKeyword, CanonNNS, Name); 2304 } 2305 2306 llvm::FoldingSetNodeID ID; 2307 DependentNameType::Profile(ID, Keyword, NNS, Name); 2308 2309 void *InsertPos = 0; 2310 DependentNameType *T 2311 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 2312 if (T) 2313 return QualType(T, 0); 2314 2315 T = new (*this) DependentNameType(Keyword, NNS, Name, Canon); 2316 Types.push_back(T); 2317 DependentNameTypes.InsertNode(T, InsertPos); 2318 return QualType(T, 0); 2319} 2320 2321QualType 2322ASTContext::getDependentTemplateSpecializationType( 2323 ElaboratedTypeKeyword Keyword, 2324 NestedNameSpecifier *NNS, 2325 const IdentifierInfo *Name, 2326 const TemplateArgumentListInfo &Args) const { 2327 // TODO: avoid this copy 2328 llvm::SmallVector<TemplateArgument, 16> ArgCopy; 2329 for (unsigned I = 0, E = Args.size(); I != E; ++I) 2330 ArgCopy.push_back(Args[I].getArgument()); 2331 return getDependentTemplateSpecializationType(Keyword, NNS, Name, 2332 ArgCopy.size(), 2333 ArgCopy.data()); 2334} 2335 2336QualType 2337ASTContext::getDependentTemplateSpecializationType( 2338 ElaboratedTypeKeyword Keyword, 2339 NestedNameSpecifier *NNS, 2340 const IdentifierInfo *Name, 2341 unsigned NumArgs, 2342 const TemplateArgument *Args) const { 2343 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 2344 2345 llvm::FoldingSetNodeID ID; 2346 DependentTemplateSpecializationType::Profile(ID, *this, Keyword, NNS, 2347 Name, NumArgs, Args); 2348 2349 void *InsertPos = 0; 2350 DependentTemplateSpecializationType *T 2351 = DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2352 if (T) 2353 return QualType(T, 0); 2354 2355 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2356 2357 ElaboratedTypeKeyword CanonKeyword = Keyword; 2358 if (Keyword == ETK_None) CanonKeyword = ETK_Typename; 2359 2360 bool AnyNonCanonArgs = false; 2361 llvm::SmallVector<TemplateArgument, 16> CanonArgs(NumArgs); 2362 for (unsigned I = 0; I != NumArgs; ++I) { 2363 CanonArgs[I] = getCanonicalTemplateArgument(Args[I]); 2364 if (!CanonArgs[I].structurallyEquals(Args[I])) 2365 AnyNonCanonArgs = true; 2366 } 2367 2368 QualType Canon; 2369 if (AnyNonCanonArgs || CanonNNS != NNS || CanonKeyword != Keyword) { 2370 Canon = getDependentTemplateSpecializationType(CanonKeyword, CanonNNS, 2371 Name, NumArgs, 2372 CanonArgs.data()); 2373 2374 // Find the insert position again. 2375 DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2376 } 2377 2378 void *Mem = Allocate((sizeof(DependentTemplateSpecializationType) + 2379 sizeof(TemplateArgument) * NumArgs), 2380 TypeAlignment); 2381 T = new (Mem) DependentTemplateSpecializationType(Keyword, NNS, 2382 Name, NumArgs, Args, Canon); 2383 Types.push_back(T); 2384 DependentTemplateSpecializationTypes.InsertNode(T, InsertPos); 2385 return QualType(T, 0); 2386} 2387 2388QualType ASTContext::getPackExpansionType(QualType Pattern, 2389 llvm::Optional<unsigned> NumExpansions) { 2390 llvm::FoldingSetNodeID ID; 2391 PackExpansionType::Profile(ID, Pattern, NumExpansions); 2392 2393 assert(Pattern->containsUnexpandedParameterPack() && 2394 "Pack expansions must expand one or more parameter packs"); 2395 void *InsertPos = 0; 2396 PackExpansionType *T 2397 = PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2398 if (T) 2399 return QualType(T, 0); 2400 2401 QualType Canon; 2402 if (!Pattern.isCanonical()) { 2403 Canon = getPackExpansionType(getCanonicalType(Pattern), NumExpansions); 2404 2405 // Find the insert position again. 2406 PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2407 } 2408 2409 T = new (*this) PackExpansionType(Pattern, Canon, NumExpansions); 2410 Types.push_back(T); 2411 PackExpansionTypes.InsertNode(T, InsertPos); 2412 return QualType(T, 0); 2413} 2414 2415/// CmpProtocolNames - Comparison predicate for sorting protocols 2416/// alphabetically. 2417static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 2418 const ObjCProtocolDecl *RHS) { 2419 return LHS->getDeclName() < RHS->getDeclName(); 2420} 2421 2422static bool areSortedAndUniqued(ObjCProtocolDecl * const *Protocols, 2423 unsigned NumProtocols) { 2424 if (NumProtocols == 0) return true; 2425 2426 for (unsigned i = 1; i != NumProtocols; ++i) 2427 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 2428 return false; 2429 return true; 2430} 2431 2432static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2433 unsigned &NumProtocols) { 2434 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2435 2436 // Sort protocols, keyed by name. 2437 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2438 2439 // Remove duplicates. 2440 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2441 NumProtocols = ProtocolsEnd-Protocols; 2442} 2443 2444QualType ASTContext::getObjCObjectType(QualType BaseType, 2445 ObjCProtocolDecl * const *Protocols, 2446 unsigned NumProtocols) const { 2447 // If the base type is an interface and there aren't any protocols 2448 // to add, then the interface type will do just fine. 2449 if (!NumProtocols && isa<ObjCInterfaceType>(BaseType)) 2450 return BaseType; 2451 2452 // Look in the folding set for an existing type. 2453 llvm::FoldingSetNodeID ID; 2454 ObjCObjectTypeImpl::Profile(ID, BaseType, Protocols, NumProtocols); 2455 void *InsertPos = 0; 2456 if (ObjCObjectType *QT = ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos)) 2457 return QualType(QT, 0); 2458 2459 // Build the canonical type, which has the canonical base type and 2460 // a sorted-and-uniqued list of protocols. 2461 QualType Canonical; 2462 bool ProtocolsSorted = areSortedAndUniqued(Protocols, NumProtocols); 2463 if (!ProtocolsSorted || !BaseType.isCanonical()) { 2464 if (!ProtocolsSorted) { 2465 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(Protocols, 2466 Protocols + NumProtocols); 2467 unsigned UniqueCount = NumProtocols; 2468 2469 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2470 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2471 &Sorted[0], UniqueCount); 2472 } else { 2473 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2474 Protocols, NumProtocols); 2475 } 2476 2477 // Regenerate InsertPos. 2478 ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos); 2479 } 2480 2481 unsigned Size = sizeof(ObjCObjectTypeImpl); 2482 Size += NumProtocols * sizeof(ObjCProtocolDecl *); 2483 void *Mem = Allocate(Size, TypeAlignment); 2484 ObjCObjectTypeImpl *T = 2485 new (Mem) ObjCObjectTypeImpl(Canonical, BaseType, Protocols, NumProtocols); 2486 2487 Types.push_back(T); 2488 ObjCObjectTypes.InsertNode(T, InsertPos); 2489 return QualType(T, 0); 2490} 2491 2492/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2493/// the given object type. 2494QualType ASTContext::getObjCObjectPointerType(QualType ObjectT) const { 2495 llvm::FoldingSetNodeID ID; 2496 ObjCObjectPointerType::Profile(ID, ObjectT); 2497 2498 void *InsertPos = 0; 2499 if (ObjCObjectPointerType *QT = 2500 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2501 return QualType(QT, 0); 2502 2503 // Find the canonical object type. 2504 QualType Canonical; 2505 if (!ObjectT.isCanonical()) { 2506 Canonical = getObjCObjectPointerType(getCanonicalType(ObjectT)); 2507 2508 // Regenerate InsertPos. 2509 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2510 } 2511 2512 // No match. 2513 void *Mem = Allocate(sizeof(ObjCObjectPointerType), TypeAlignment); 2514 ObjCObjectPointerType *QType = 2515 new (Mem) ObjCObjectPointerType(Canonical, ObjectT); 2516 2517 Types.push_back(QType); 2518 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2519 return QualType(QType, 0); 2520} 2521 2522/// getObjCInterfaceType - Return the unique reference to the type for the 2523/// specified ObjC interface decl. The list of protocols is optional. 2524QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) const { 2525 if (Decl->TypeForDecl) 2526 return QualType(Decl->TypeForDecl, 0); 2527 2528 // FIXME: redeclarations? 2529 void *Mem = Allocate(sizeof(ObjCInterfaceType), TypeAlignment); 2530 ObjCInterfaceType *T = new (Mem) ObjCInterfaceType(Decl); 2531 Decl->TypeForDecl = T; 2532 Types.push_back(T); 2533 return QualType(T, 0); 2534} 2535 2536/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2537/// TypeOfExprType AST's (since expression's are never shared). For example, 2538/// multiple declarations that refer to "typeof(x)" all contain different 2539/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2540/// on canonical type's (which are always unique). 2541QualType ASTContext::getTypeOfExprType(Expr *tofExpr) const { 2542 TypeOfExprType *toe; 2543 if (tofExpr->isTypeDependent()) { 2544 llvm::FoldingSetNodeID ID; 2545 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2546 2547 void *InsertPos = 0; 2548 DependentTypeOfExprType *Canon 2549 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2550 if (Canon) { 2551 // We already have a "canonical" version of an identical, dependent 2552 // typeof(expr) type. Use that as our canonical type. 2553 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2554 QualType((TypeOfExprType*)Canon, 0)); 2555 } 2556 else { 2557 // Build a new, canonical typeof(expr) type. 2558 Canon 2559 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2560 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2561 toe = Canon; 2562 } 2563 } else { 2564 QualType Canonical = getCanonicalType(tofExpr->getType()); 2565 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2566 } 2567 Types.push_back(toe); 2568 return QualType(toe, 0); 2569} 2570 2571/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2572/// TypeOfType AST's. The only motivation to unique these nodes would be 2573/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2574/// an issue. This doesn't effect the type checker, since it operates 2575/// on canonical type's (which are always unique). 2576QualType ASTContext::getTypeOfType(QualType tofType) const { 2577 QualType Canonical = getCanonicalType(tofType); 2578 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2579 Types.push_back(tot); 2580 return QualType(tot, 0); 2581} 2582 2583/// getDecltypeForExpr - Given an expr, will return the decltype for that 2584/// expression, according to the rules in C++0x [dcl.type.simple]p4 2585static QualType getDecltypeForExpr(const Expr *e, const ASTContext &Context) { 2586 if (e->isTypeDependent()) 2587 return Context.DependentTy; 2588 2589 // If e is an id expression or a class member access, decltype(e) is defined 2590 // as the type of the entity named by e. 2591 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2592 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2593 return VD->getType(); 2594 } 2595 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2596 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2597 return FD->getType(); 2598 } 2599 // If e is a function call or an invocation of an overloaded operator, 2600 // (parentheses around e are ignored), decltype(e) is defined as the 2601 // return type of that function. 2602 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2603 return CE->getCallReturnType(); 2604 2605 QualType T = e->getType(); 2606 2607 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2608 // defined as T&, otherwise decltype(e) is defined as T. 2609 if (e->isLValue()) 2610 T = Context.getLValueReferenceType(T); 2611 2612 return T; 2613} 2614 2615/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2616/// DecltypeType AST's. The only motivation to unique these nodes would be 2617/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2618/// an issue. This doesn't effect the type checker, since it operates 2619/// on canonical type's (which are always unique). 2620QualType ASTContext::getDecltypeType(Expr *e) const { 2621 DecltypeType *dt; 2622 if (e->isTypeDependent()) { 2623 llvm::FoldingSetNodeID ID; 2624 DependentDecltypeType::Profile(ID, *this, e); 2625 2626 void *InsertPos = 0; 2627 DependentDecltypeType *Canon 2628 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2629 if (Canon) { 2630 // We already have a "canonical" version of an equivalent, dependent 2631 // decltype type. Use that as our canonical type. 2632 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2633 QualType((DecltypeType*)Canon, 0)); 2634 } 2635 else { 2636 // Build a new, canonical typeof(expr) type. 2637 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2638 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2639 dt = Canon; 2640 } 2641 } else { 2642 QualType T = getDecltypeForExpr(e, *this); 2643 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2644 } 2645 Types.push_back(dt); 2646 return QualType(dt, 0); 2647} 2648 2649/// getTagDeclType - Return the unique reference to the type for the 2650/// specified TagDecl (struct/union/class/enum) decl. 2651QualType ASTContext::getTagDeclType(const TagDecl *Decl) const { 2652 assert (Decl); 2653 // FIXME: What is the design on getTagDeclType when it requires casting 2654 // away const? mutable? 2655 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2656} 2657 2658/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2659/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2660/// needs to agree with the definition in <stddef.h>. 2661CanQualType ASTContext::getSizeType() const { 2662 return getFromTargetType(Target.getSizeType()); 2663} 2664 2665/// getSignedWCharType - Return the type of "signed wchar_t". 2666/// Used when in C++, as a GCC extension. 2667QualType ASTContext::getSignedWCharType() const { 2668 // FIXME: derive from "Target" ? 2669 return WCharTy; 2670} 2671 2672/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2673/// Used when in C++, as a GCC extension. 2674QualType ASTContext::getUnsignedWCharType() const { 2675 // FIXME: derive from "Target" ? 2676 return UnsignedIntTy; 2677} 2678 2679/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2680/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2681QualType ASTContext::getPointerDiffType() const { 2682 return getFromTargetType(Target.getPtrDiffType(0)); 2683} 2684 2685//===----------------------------------------------------------------------===// 2686// Type Operators 2687//===----------------------------------------------------------------------===// 2688 2689CanQualType ASTContext::getCanonicalParamType(QualType T) const { 2690 // Push qualifiers into arrays, and then discard any remaining 2691 // qualifiers. 2692 T = getCanonicalType(T); 2693 T = getVariableArrayDecayedType(T); 2694 const Type *Ty = T.getTypePtr(); 2695 QualType Result; 2696 if (isa<ArrayType>(Ty)) { 2697 Result = getArrayDecayedType(QualType(Ty,0)); 2698 } else if (isa<FunctionType>(Ty)) { 2699 Result = getPointerType(QualType(Ty, 0)); 2700 } else { 2701 Result = QualType(Ty, 0); 2702 } 2703 2704 return CanQualType::CreateUnsafe(Result); 2705} 2706 2707 2708QualType ASTContext::getUnqualifiedArrayType(QualType type, 2709 Qualifiers &quals) { 2710 SplitQualType splitType = type.getSplitUnqualifiedType(); 2711 2712 // FIXME: getSplitUnqualifiedType() actually walks all the way to 2713 // the unqualified desugared type and then drops it on the floor. 2714 // We then have to strip that sugar back off with 2715 // getUnqualifiedDesugaredType(), which is silly. 2716 const ArrayType *AT = 2717 dyn_cast<ArrayType>(splitType.first->getUnqualifiedDesugaredType()); 2718 2719 // If we don't have an array, just use the results in splitType. 2720 if (!AT) { 2721 quals = splitType.second; 2722 return QualType(splitType.first, 0); 2723 } 2724 2725 // Otherwise, recurse on the array's element type. 2726 QualType elementType = AT->getElementType(); 2727 QualType unqualElementType = getUnqualifiedArrayType(elementType, quals); 2728 2729 // If that didn't change the element type, AT has no qualifiers, so we 2730 // can just use the results in splitType. 2731 if (elementType == unqualElementType) { 2732 assert(quals.empty()); // from the recursive call 2733 quals = splitType.second; 2734 return QualType(splitType.first, 0); 2735 } 2736 2737 // Otherwise, add in the qualifiers from the outermost type, then 2738 // build the type back up. 2739 quals.addConsistentQualifiers(splitType.second); 2740 2741 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) { 2742 return getConstantArrayType(unqualElementType, CAT->getSize(), 2743 CAT->getSizeModifier(), 0); 2744 } 2745 2746 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 2747 return getIncompleteArrayType(unqualElementType, IAT->getSizeModifier(), 0); 2748 } 2749 2750 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(AT)) { 2751 return getVariableArrayType(unqualElementType, 2752 VAT->getSizeExpr(), 2753 VAT->getSizeModifier(), 2754 VAT->getIndexTypeCVRQualifiers(), 2755 VAT->getBracketsRange()); 2756 } 2757 2758 const DependentSizedArrayType *DSAT = cast<DependentSizedArrayType>(AT); 2759 return getDependentSizedArrayType(unqualElementType, DSAT->getSizeExpr(), 2760 DSAT->getSizeModifier(), 0, 2761 SourceRange()); 2762} 2763 2764/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 2765/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 2766/// they point to and return true. If T1 and T2 aren't pointer types 2767/// or pointer-to-member types, or if they are not similar at this 2768/// level, returns false and leaves T1 and T2 unchanged. Top-level 2769/// qualifiers on T1 and T2 are ignored. This function will typically 2770/// be called in a loop that successively "unwraps" pointer and 2771/// pointer-to-member types to compare them at each level. 2772bool ASTContext::UnwrapSimilarPointerTypes(QualType &T1, QualType &T2) { 2773 const PointerType *T1PtrType = T1->getAs<PointerType>(), 2774 *T2PtrType = T2->getAs<PointerType>(); 2775 if (T1PtrType && T2PtrType) { 2776 T1 = T1PtrType->getPointeeType(); 2777 T2 = T2PtrType->getPointeeType(); 2778 return true; 2779 } 2780 2781 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 2782 *T2MPType = T2->getAs<MemberPointerType>(); 2783 if (T1MPType && T2MPType && 2784 hasSameUnqualifiedType(QualType(T1MPType->getClass(), 0), 2785 QualType(T2MPType->getClass(), 0))) { 2786 T1 = T1MPType->getPointeeType(); 2787 T2 = T2MPType->getPointeeType(); 2788 return true; 2789 } 2790 2791 if (getLangOptions().ObjC1) { 2792 const ObjCObjectPointerType *T1OPType = T1->getAs<ObjCObjectPointerType>(), 2793 *T2OPType = T2->getAs<ObjCObjectPointerType>(); 2794 if (T1OPType && T2OPType) { 2795 T1 = T1OPType->getPointeeType(); 2796 T2 = T2OPType->getPointeeType(); 2797 return true; 2798 } 2799 } 2800 2801 // FIXME: Block pointers, too? 2802 2803 return false; 2804} 2805 2806DeclarationNameInfo 2807ASTContext::getNameForTemplate(TemplateName Name, 2808 SourceLocation NameLoc) const { 2809 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2810 // DNInfo work in progress: CHECKME: what about DNLoc? 2811 return DeclarationNameInfo(TD->getDeclName(), NameLoc); 2812 2813 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2814 DeclarationName DName; 2815 if (DTN->isIdentifier()) { 2816 DName = DeclarationNames.getIdentifier(DTN->getIdentifier()); 2817 return DeclarationNameInfo(DName, NameLoc); 2818 } else { 2819 DName = DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2820 // DNInfo work in progress: FIXME: source locations? 2821 DeclarationNameLoc DNLoc; 2822 DNLoc.CXXOperatorName.BeginOpNameLoc = SourceLocation().getRawEncoding(); 2823 DNLoc.CXXOperatorName.EndOpNameLoc = SourceLocation().getRawEncoding(); 2824 return DeclarationNameInfo(DName, NameLoc, DNLoc); 2825 } 2826 } 2827 2828 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2829 assert(Storage); 2830 // DNInfo work in progress: CHECKME: what about DNLoc? 2831 return DeclarationNameInfo((*Storage->begin())->getDeclName(), NameLoc); 2832} 2833 2834TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) const { 2835 if (TemplateDecl *Template = Name.getAsTemplateDecl()) { 2836 if (TemplateTemplateParmDecl *TTP 2837 = dyn_cast<TemplateTemplateParmDecl>(Template)) 2838 Template = getCanonicalTemplateTemplateParmDecl(TTP); 2839 2840 // The canonical template name is the canonical template declaration. 2841 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2842 } 2843 2844 if (SubstTemplateTemplateParmPackStorage *SubstPack 2845 = Name.getAsSubstTemplateTemplateParmPack()) { 2846 TemplateTemplateParmDecl *CanonParam 2847 = getCanonicalTemplateTemplateParmDecl(SubstPack->getParameterPack()); 2848 TemplateArgument CanonArgPack 2849 = getCanonicalTemplateArgument(SubstPack->getArgumentPack()); 2850 return getSubstTemplateTemplateParmPack(CanonParam, CanonArgPack); 2851 } 2852 2853 assert(!Name.getAsOverloadedTemplate()); 2854 2855 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2856 assert(DTN && "Non-dependent template names must refer to template decls."); 2857 return DTN->CanonicalTemplateName; 2858} 2859 2860bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2861 X = getCanonicalTemplateName(X); 2862 Y = getCanonicalTemplateName(Y); 2863 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2864} 2865 2866TemplateArgument 2867ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) const { 2868 switch (Arg.getKind()) { 2869 case TemplateArgument::Null: 2870 return Arg; 2871 2872 case TemplateArgument::Expression: 2873 return Arg; 2874 2875 case TemplateArgument::Declaration: 2876 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2877 2878 case TemplateArgument::Template: 2879 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2880 2881 case TemplateArgument::TemplateExpansion: 2882 return TemplateArgument(getCanonicalTemplateName( 2883 Arg.getAsTemplateOrTemplatePattern()), 2884 Arg.getNumTemplateExpansions()); 2885 2886 case TemplateArgument::Integral: 2887 return TemplateArgument(*Arg.getAsIntegral(), 2888 getCanonicalType(Arg.getIntegralType())); 2889 2890 case TemplateArgument::Type: 2891 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2892 2893 case TemplateArgument::Pack: { 2894 if (Arg.pack_size() == 0) 2895 return Arg; 2896 2897 TemplateArgument *CanonArgs 2898 = new (*this) TemplateArgument[Arg.pack_size()]; 2899 unsigned Idx = 0; 2900 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2901 AEnd = Arg.pack_end(); 2902 A != AEnd; (void)++A, ++Idx) 2903 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2904 2905 return TemplateArgument(CanonArgs, Arg.pack_size()); 2906 } 2907 } 2908 2909 // Silence GCC warning 2910 assert(false && "Unhandled template argument kind"); 2911 return TemplateArgument(); 2912} 2913 2914NestedNameSpecifier * 2915ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) const { 2916 if (!NNS) 2917 return 0; 2918 2919 switch (NNS->getKind()) { 2920 case NestedNameSpecifier::Identifier: 2921 // Canonicalize the prefix but keep the identifier the same. 2922 return NestedNameSpecifier::Create(*this, 2923 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2924 NNS->getAsIdentifier()); 2925 2926 case NestedNameSpecifier::Namespace: 2927 // A namespace is canonical; build a nested-name-specifier with 2928 // this namespace and no prefix. 2929 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2930 2931 case NestedNameSpecifier::TypeSpec: 2932 case NestedNameSpecifier::TypeSpecWithTemplate: { 2933 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2934 2935 // If we have some kind of dependent-named type (e.g., "typename T::type"), 2936 // break it apart into its prefix and identifier, then reconsititute those 2937 // as the canonical nested-name-specifier. This is required to canonicalize 2938 // a dependent nested-name-specifier involving typedefs of dependent-name 2939 // types, e.g., 2940 // typedef typename T::type T1; 2941 // typedef typename T1::type T2; 2942 if (const DependentNameType *DNT = T->getAs<DependentNameType>()) { 2943 NestedNameSpecifier *Prefix 2944 = getCanonicalNestedNameSpecifier(DNT->getQualifier()); 2945 return NestedNameSpecifier::Create(*this, Prefix, 2946 const_cast<IdentifierInfo *>(DNT->getIdentifier())); 2947 } 2948 2949 // Do the same thing as above, but with dependent-named specializations. 2950 if (const DependentTemplateSpecializationType *DTST 2951 = T->getAs<DependentTemplateSpecializationType>()) { 2952 NestedNameSpecifier *Prefix 2953 = getCanonicalNestedNameSpecifier(DTST->getQualifier()); 2954 TemplateName Name 2955 = getDependentTemplateName(Prefix, DTST->getIdentifier()); 2956 T = getTemplateSpecializationType(Name, 2957 DTST->getArgs(), DTST->getNumArgs()); 2958 T = getCanonicalType(T); 2959 } 2960 2961 return NestedNameSpecifier::Create(*this, 0, false, 2962 const_cast<Type*>(T.getTypePtr())); 2963 } 2964 2965 case NestedNameSpecifier::Global: 2966 // The global specifier is canonical and unique. 2967 return NNS; 2968 } 2969 2970 // Required to silence a GCC warning 2971 return 0; 2972} 2973 2974 2975const ArrayType *ASTContext::getAsArrayType(QualType T) const { 2976 // Handle the non-qualified case efficiently. 2977 if (!T.hasLocalQualifiers()) { 2978 // Handle the common positive case fast. 2979 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2980 return AT; 2981 } 2982 2983 // Handle the common negative case fast. 2984 if (!isa<ArrayType>(T.getCanonicalType())) 2985 return 0; 2986 2987 // Apply any qualifiers from the array type to the element type. This 2988 // implements C99 6.7.3p8: "If the specification of an array type includes 2989 // any type qualifiers, the element type is so qualified, not the array type." 2990 2991 // If we get here, we either have type qualifiers on the type, or we have 2992 // sugar such as a typedef in the way. If we have type qualifiers on the type 2993 // we must propagate them down into the element type. 2994 2995 SplitQualType split = T.getSplitDesugaredType(); 2996 Qualifiers qs = split.second; 2997 2998 // If we have a simple case, just return now. 2999 const ArrayType *ATy = dyn_cast<ArrayType>(split.first); 3000 if (ATy == 0 || qs.empty()) 3001 return ATy; 3002 3003 // Otherwise, we have an array and we have qualifiers on it. Push the 3004 // qualifiers into the array element type and return a new array type. 3005 QualType NewEltTy = getQualifiedType(ATy->getElementType(), qs); 3006 3007 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 3008 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 3009 CAT->getSizeModifier(), 3010 CAT->getIndexTypeCVRQualifiers())); 3011 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 3012 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 3013 IAT->getSizeModifier(), 3014 IAT->getIndexTypeCVRQualifiers())); 3015 3016 if (const DependentSizedArrayType *DSAT 3017 = dyn_cast<DependentSizedArrayType>(ATy)) 3018 return cast<ArrayType>( 3019 getDependentSizedArrayType(NewEltTy, 3020 DSAT->getSizeExpr(), 3021 DSAT->getSizeModifier(), 3022 DSAT->getIndexTypeCVRQualifiers(), 3023 DSAT->getBracketsRange())); 3024 3025 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 3026 return cast<ArrayType>(getVariableArrayType(NewEltTy, 3027 VAT->getSizeExpr(), 3028 VAT->getSizeModifier(), 3029 VAT->getIndexTypeCVRQualifiers(), 3030 VAT->getBracketsRange())); 3031} 3032 3033/// getArrayDecayedType - Return the properly qualified result of decaying the 3034/// specified array type to a pointer. This operation is non-trivial when 3035/// handling typedefs etc. The canonical type of "T" must be an array type, 3036/// this returns a pointer to a properly qualified element of the array. 3037/// 3038/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 3039QualType ASTContext::getArrayDecayedType(QualType Ty) const { 3040 // Get the element type with 'getAsArrayType' so that we don't lose any 3041 // typedefs in the element type of the array. This also handles propagation 3042 // of type qualifiers from the array type into the element type if present 3043 // (C99 6.7.3p8). 3044 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 3045 assert(PrettyArrayType && "Not an array type!"); 3046 3047 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 3048 3049 // int x[restrict 4] -> int *restrict 3050 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 3051} 3052 3053QualType ASTContext::getBaseElementType(const ArrayType *array) const { 3054 return getBaseElementType(array->getElementType()); 3055} 3056 3057QualType ASTContext::getBaseElementType(QualType type) const { 3058 Qualifiers qs; 3059 while (true) { 3060 SplitQualType split = type.getSplitDesugaredType(); 3061 const ArrayType *array = split.first->getAsArrayTypeUnsafe(); 3062 if (!array) break; 3063 3064 type = array->getElementType(); 3065 qs.addConsistentQualifiers(split.second); 3066 } 3067 3068 return getQualifiedType(type, qs); 3069} 3070 3071/// getConstantArrayElementCount - Returns number of constant array elements. 3072uint64_t 3073ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 3074 uint64_t ElementCount = 1; 3075 do { 3076 ElementCount *= CA->getSize().getZExtValue(); 3077 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 3078 } while (CA); 3079 return ElementCount; 3080} 3081 3082/// getFloatingRank - Return a relative rank for floating point types. 3083/// This routine will assert if passed a built-in type that isn't a float. 3084static FloatingRank getFloatingRank(QualType T) { 3085 if (const ComplexType *CT = T->getAs<ComplexType>()) 3086 return getFloatingRank(CT->getElementType()); 3087 3088 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 3089 switch (T->getAs<BuiltinType>()->getKind()) { 3090 default: assert(0 && "getFloatingRank(): not a floating type"); 3091 case BuiltinType::Float: return FloatRank; 3092 case BuiltinType::Double: return DoubleRank; 3093 case BuiltinType::LongDouble: return LongDoubleRank; 3094 } 3095} 3096 3097/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 3098/// point or a complex type (based on typeDomain/typeSize). 3099/// 'typeDomain' is a real floating point or complex type. 3100/// 'typeSize' is a real floating point or complex type. 3101QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 3102 QualType Domain) const { 3103 FloatingRank EltRank = getFloatingRank(Size); 3104 if (Domain->isComplexType()) { 3105 switch (EltRank) { 3106 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3107 case FloatRank: return FloatComplexTy; 3108 case DoubleRank: return DoubleComplexTy; 3109 case LongDoubleRank: return LongDoubleComplexTy; 3110 } 3111 } 3112 3113 assert(Domain->isRealFloatingType() && "Unknown domain!"); 3114 switch (EltRank) { 3115 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3116 case FloatRank: return FloatTy; 3117 case DoubleRank: return DoubleTy; 3118 case LongDoubleRank: return LongDoubleTy; 3119 } 3120} 3121 3122/// getFloatingTypeOrder - Compare the rank of the two specified floating 3123/// point types, ignoring the domain of the type (i.e. 'double' == 3124/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 3125/// LHS < RHS, return -1. 3126int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) const { 3127 FloatingRank LHSR = getFloatingRank(LHS); 3128 FloatingRank RHSR = getFloatingRank(RHS); 3129 3130 if (LHSR == RHSR) 3131 return 0; 3132 if (LHSR > RHSR) 3133 return 1; 3134 return -1; 3135} 3136 3137/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 3138/// routine will assert if passed a built-in type that isn't an integer or enum, 3139/// or if it is not canonicalized. 3140unsigned ASTContext::getIntegerRank(const Type *T) const { 3141 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 3142 if (const EnumType* ET = dyn_cast<EnumType>(T)) 3143 T = ET->getDecl()->getPromotionType().getTypePtr(); 3144 3145 if (T->isSpecificBuiltinType(BuiltinType::WChar_S) || 3146 T->isSpecificBuiltinType(BuiltinType::WChar_U)) 3147 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 3148 3149 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 3150 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 3151 3152 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 3153 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 3154 3155 switch (cast<BuiltinType>(T)->getKind()) { 3156 default: assert(0 && "getIntegerRank(): not a built-in integer"); 3157 case BuiltinType::Bool: 3158 return 1 + (getIntWidth(BoolTy) << 3); 3159 case BuiltinType::Char_S: 3160 case BuiltinType::Char_U: 3161 case BuiltinType::SChar: 3162 case BuiltinType::UChar: 3163 return 2 + (getIntWidth(CharTy) << 3); 3164 case BuiltinType::Short: 3165 case BuiltinType::UShort: 3166 return 3 + (getIntWidth(ShortTy) << 3); 3167 case BuiltinType::Int: 3168 case BuiltinType::UInt: 3169 return 4 + (getIntWidth(IntTy) << 3); 3170 case BuiltinType::Long: 3171 case BuiltinType::ULong: 3172 return 5 + (getIntWidth(LongTy) << 3); 3173 case BuiltinType::LongLong: 3174 case BuiltinType::ULongLong: 3175 return 6 + (getIntWidth(LongLongTy) << 3); 3176 case BuiltinType::Int128: 3177 case BuiltinType::UInt128: 3178 return 7 + (getIntWidth(Int128Ty) << 3); 3179 } 3180} 3181 3182/// \brief Whether this is a promotable bitfield reference according 3183/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 3184/// 3185/// \returns the type this bit-field will promote to, or NULL if no 3186/// promotion occurs. 3187QualType ASTContext::isPromotableBitField(Expr *E) const { 3188 if (E->isTypeDependent() || E->isValueDependent()) 3189 return QualType(); 3190 3191 FieldDecl *Field = E->getBitField(); 3192 if (!Field) 3193 return QualType(); 3194 3195 QualType FT = Field->getType(); 3196 3197 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 3198 uint64_t BitWidth = BitWidthAP.getZExtValue(); 3199 uint64_t IntSize = getTypeSize(IntTy); 3200 // GCC extension compatibility: if the bit-field size is less than or equal 3201 // to the size of int, it gets promoted no matter what its type is. 3202 // For instance, unsigned long bf : 4 gets promoted to signed int. 3203 if (BitWidth < IntSize) 3204 return IntTy; 3205 3206 if (BitWidth == IntSize) 3207 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 3208 3209 // Types bigger than int are not subject to promotions, and therefore act 3210 // like the base type. 3211 // FIXME: This doesn't quite match what gcc does, but what gcc does here 3212 // is ridiculous. 3213 return QualType(); 3214} 3215 3216/// getPromotedIntegerType - Returns the type that Promotable will 3217/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 3218/// integer type. 3219QualType ASTContext::getPromotedIntegerType(QualType Promotable) const { 3220 assert(!Promotable.isNull()); 3221 assert(Promotable->isPromotableIntegerType()); 3222 if (const EnumType *ET = Promotable->getAs<EnumType>()) 3223 return ET->getDecl()->getPromotionType(); 3224 if (Promotable->isSignedIntegerType()) 3225 return IntTy; 3226 uint64_t PromotableSize = getTypeSize(Promotable); 3227 uint64_t IntSize = getTypeSize(IntTy); 3228 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 3229 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 3230} 3231 3232/// getIntegerTypeOrder - Returns the highest ranked integer type: 3233/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 3234/// LHS < RHS, return -1. 3235int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) const { 3236 const Type *LHSC = getCanonicalType(LHS).getTypePtr(); 3237 const Type *RHSC = getCanonicalType(RHS).getTypePtr(); 3238 if (LHSC == RHSC) return 0; 3239 3240 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 3241 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 3242 3243 unsigned LHSRank = getIntegerRank(LHSC); 3244 unsigned RHSRank = getIntegerRank(RHSC); 3245 3246 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 3247 if (LHSRank == RHSRank) return 0; 3248 return LHSRank > RHSRank ? 1 : -1; 3249 } 3250 3251 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 3252 if (LHSUnsigned) { 3253 // If the unsigned [LHS] type is larger, return it. 3254 if (LHSRank >= RHSRank) 3255 return 1; 3256 3257 // If the signed type can represent all values of the unsigned type, it 3258 // wins. Because we are dealing with 2's complement and types that are 3259 // powers of two larger than each other, this is always safe. 3260 return -1; 3261 } 3262 3263 // If the unsigned [RHS] type is larger, return it. 3264 if (RHSRank >= LHSRank) 3265 return -1; 3266 3267 // If the signed type can represent all values of the unsigned type, it 3268 // wins. Because we are dealing with 2's complement and types that are 3269 // powers of two larger than each other, this is always safe. 3270 return 1; 3271} 3272 3273static RecordDecl * 3274CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 3275 SourceLocation L, IdentifierInfo *Id) { 3276 if (Ctx.getLangOptions().CPlusPlus) 3277 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 3278 else 3279 return RecordDecl::Create(Ctx, TK, DC, L, Id); 3280} 3281 3282// getCFConstantStringType - Return the type used for constant CFStrings. 3283QualType ASTContext::getCFConstantStringType() const { 3284 if (!CFConstantStringTypeDecl) { 3285 CFConstantStringTypeDecl = 3286 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3287 &Idents.get("NSConstantString")); 3288 CFConstantStringTypeDecl->startDefinition(); 3289 3290 QualType FieldTypes[4]; 3291 3292 // const int *isa; 3293 FieldTypes[0] = getPointerType(IntTy.withConst()); 3294 // int flags; 3295 FieldTypes[1] = IntTy; 3296 // const char *str; 3297 FieldTypes[2] = getPointerType(CharTy.withConst()); 3298 // long length; 3299 FieldTypes[3] = LongTy; 3300 3301 // Create fields 3302 for (unsigned i = 0; i < 4; ++i) { 3303 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 3304 SourceLocation(), 0, 3305 FieldTypes[i], /*TInfo=*/0, 3306 /*BitWidth=*/0, 3307 /*Mutable=*/false); 3308 Field->setAccess(AS_public); 3309 CFConstantStringTypeDecl->addDecl(Field); 3310 } 3311 3312 CFConstantStringTypeDecl->completeDefinition(); 3313 } 3314 3315 return getTagDeclType(CFConstantStringTypeDecl); 3316} 3317 3318void ASTContext::setCFConstantStringType(QualType T) { 3319 const RecordType *Rec = T->getAs<RecordType>(); 3320 assert(Rec && "Invalid CFConstantStringType"); 3321 CFConstantStringTypeDecl = Rec->getDecl(); 3322} 3323 3324// getNSConstantStringType - Return the type used for constant NSStrings. 3325QualType ASTContext::getNSConstantStringType() const { 3326 if (!NSConstantStringTypeDecl) { 3327 NSConstantStringTypeDecl = 3328 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3329 &Idents.get("__builtin_NSString")); 3330 NSConstantStringTypeDecl->startDefinition(); 3331 3332 QualType FieldTypes[3]; 3333 3334 // const int *isa; 3335 FieldTypes[0] = getPointerType(IntTy.withConst()); 3336 // const char *str; 3337 FieldTypes[1] = getPointerType(CharTy.withConst()); 3338 // unsigned int length; 3339 FieldTypes[2] = UnsignedIntTy; 3340 3341 // Create fields 3342 for (unsigned i = 0; i < 3; ++i) { 3343 FieldDecl *Field = FieldDecl::Create(*this, NSConstantStringTypeDecl, 3344 SourceLocation(), 0, 3345 FieldTypes[i], /*TInfo=*/0, 3346 /*BitWidth=*/0, 3347 /*Mutable=*/false); 3348 Field->setAccess(AS_public); 3349 NSConstantStringTypeDecl->addDecl(Field); 3350 } 3351 3352 NSConstantStringTypeDecl->completeDefinition(); 3353 } 3354 3355 return getTagDeclType(NSConstantStringTypeDecl); 3356} 3357 3358void ASTContext::setNSConstantStringType(QualType T) { 3359 const RecordType *Rec = T->getAs<RecordType>(); 3360 assert(Rec && "Invalid NSConstantStringType"); 3361 NSConstantStringTypeDecl = Rec->getDecl(); 3362} 3363 3364QualType ASTContext::getObjCFastEnumerationStateType() const { 3365 if (!ObjCFastEnumerationStateTypeDecl) { 3366 ObjCFastEnumerationStateTypeDecl = 3367 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3368 &Idents.get("__objcFastEnumerationState")); 3369 ObjCFastEnumerationStateTypeDecl->startDefinition(); 3370 3371 QualType FieldTypes[] = { 3372 UnsignedLongTy, 3373 getPointerType(ObjCIdTypedefType), 3374 getPointerType(UnsignedLongTy), 3375 getConstantArrayType(UnsignedLongTy, 3376 llvm::APInt(32, 5), ArrayType::Normal, 0) 3377 }; 3378 3379 for (size_t i = 0; i < 4; ++i) { 3380 FieldDecl *Field = FieldDecl::Create(*this, 3381 ObjCFastEnumerationStateTypeDecl, 3382 SourceLocation(), 0, 3383 FieldTypes[i], /*TInfo=*/0, 3384 /*BitWidth=*/0, 3385 /*Mutable=*/false); 3386 Field->setAccess(AS_public); 3387 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 3388 } 3389 3390 ObjCFastEnumerationStateTypeDecl->completeDefinition(); 3391 } 3392 3393 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 3394} 3395 3396QualType ASTContext::getBlockDescriptorType() const { 3397 if (BlockDescriptorType) 3398 return getTagDeclType(BlockDescriptorType); 3399 3400 RecordDecl *T; 3401 // FIXME: Needs the FlagAppleBlock bit. 3402 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3403 &Idents.get("__block_descriptor")); 3404 T->startDefinition(); 3405 3406 QualType FieldTypes[] = { 3407 UnsignedLongTy, 3408 UnsignedLongTy, 3409 }; 3410 3411 const char *FieldNames[] = { 3412 "reserved", 3413 "Size" 3414 }; 3415 3416 for (size_t i = 0; i < 2; ++i) { 3417 FieldDecl *Field = FieldDecl::Create(*this, 3418 T, 3419 SourceLocation(), 3420 &Idents.get(FieldNames[i]), 3421 FieldTypes[i], /*TInfo=*/0, 3422 /*BitWidth=*/0, 3423 /*Mutable=*/false); 3424 Field->setAccess(AS_public); 3425 T->addDecl(Field); 3426 } 3427 3428 T->completeDefinition(); 3429 3430 BlockDescriptorType = T; 3431 3432 return getTagDeclType(BlockDescriptorType); 3433} 3434 3435void ASTContext::setBlockDescriptorType(QualType T) { 3436 const RecordType *Rec = T->getAs<RecordType>(); 3437 assert(Rec && "Invalid BlockDescriptorType"); 3438 BlockDescriptorType = Rec->getDecl(); 3439} 3440 3441QualType ASTContext::getBlockDescriptorExtendedType() const { 3442 if (BlockDescriptorExtendedType) 3443 return getTagDeclType(BlockDescriptorExtendedType); 3444 3445 RecordDecl *T; 3446 // FIXME: Needs the FlagAppleBlock bit. 3447 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3448 &Idents.get("__block_descriptor_withcopydispose")); 3449 T->startDefinition(); 3450 3451 QualType FieldTypes[] = { 3452 UnsignedLongTy, 3453 UnsignedLongTy, 3454 getPointerType(VoidPtrTy), 3455 getPointerType(VoidPtrTy) 3456 }; 3457 3458 const char *FieldNames[] = { 3459 "reserved", 3460 "Size", 3461 "CopyFuncPtr", 3462 "DestroyFuncPtr" 3463 }; 3464 3465 for (size_t i = 0; i < 4; ++i) { 3466 FieldDecl *Field = FieldDecl::Create(*this, 3467 T, 3468 SourceLocation(), 3469 &Idents.get(FieldNames[i]), 3470 FieldTypes[i], /*TInfo=*/0, 3471 /*BitWidth=*/0, 3472 /*Mutable=*/false); 3473 Field->setAccess(AS_public); 3474 T->addDecl(Field); 3475 } 3476 3477 T->completeDefinition(); 3478 3479 BlockDescriptorExtendedType = T; 3480 3481 return getTagDeclType(BlockDescriptorExtendedType); 3482} 3483 3484void ASTContext::setBlockDescriptorExtendedType(QualType T) { 3485 const RecordType *Rec = T->getAs<RecordType>(); 3486 assert(Rec && "Invalid BlockDescriptorType"); 3487 BlockDescriptorExtendedType = Rec->getDecl(); 3488} 3489 3490bool ASTContext::BlockRequiresCopying(QualType Ty) const { 3491 if (Ty->isBlockPointerType()) 3492 return true; 3493 if (isObjCNSObjectType(Ty)) 3494 return true; 3495 if (Ty->isObjCObjectPointerType()) 3496 return true; 3497 if (getLangOptions().CPlusPlus) { 3498 if (const RecordType *RT = Ty->getAs<RecordType>()) { 3499 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3500 return RD->hasConstCopyConstructor(*this); 3501 3502 } 3503 } 3504 return false; 3505} 3506 3507QualType 3508ASTContext::BuildByRefType(llvm::StringRef DeclName, QualType Ty) const { 3509 // type = struct __Block_byref_1_X { 3510 // void *__isa; 3511 // struct __Block_byref_1_X *__forwarding; 3512 // unsigned int __flags; 3513 // unsigned int __size; 3514 // void *__copy_helper; // as needed 3515 // void *__destroy_help // as needed 3516 // int X; 3517 // } * 3518 3519 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 3520 3521 // FIXME: Move up 3522 llvm::SmallString<36> Name; 3523 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 3524 ++UniqueBlockByRefTypeID << '_' << DeclName; 3525 RecordDecl *T; 3526 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3527 &Idents.get(Name.str())); 3528 T->startDefinition(); 3529 QualType Int32Ty = IntTy; 3530 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 3531 QualType FieldTypes[] = { 3532 getPointerType(VoidPtrTy), 3533 getPointerType(getTagDeclType(T)), 3534 Int32Ty, 3535 Int32Ty, 3536 getPointerType(VoidPtrTy), 3537 getPointerType(VoidPtrTy), 3538 Ty 3539 }; 3540 3541 llvm::StringRef FieldNames[] = { 3542 "__isa", 3543 "__forwarding", 3544 "__flags", 3545 "__size", 3546 "__copy_helper", 3547 "__destroy_helper", 3548 DeclName, 3549 }; 3550 3551 for (size_t i = 0; i < 7; ++i) { 3552 if (!HasCopyAndDispose && i >=4 && i <= 5) 3553 continue; 3554 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3555 &Idents.get(FieldNames[i]), 3556 FieldTypes[i], /*TInfo=*/0, 3557 /*BitWidth=*/0, /*Mutable=*/false); 3558 Field->setAccess(AS_public); 3559 T->addDecl(Field); 3560 } 3561 3562 T->completeDefinition(); 3563 3564 return getPointerType(getTagDeclType(T)); 3565} 3566 3567 3568QualType ASTContext::getBlockParmType( 3569 bool BlockHasCopyDispose, 3570 llvm::SmallVectorImpl<const Expr *> &Layout) const { 3571 3572 // FIXME: Move up 3573 llvm::SmallString<36> Name; 3574 llvm::raw_svector_ostream(Name) << "__block_literal_" 3575 << ++UniqueBlockParmTypeID; 3576 RecordDecl *T; 3577 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3578 &Idents.get(Name.str())); 3579 T->startDefinition(); 3580 QualType FieldTypes[] = { 3581 getPointerType(VoidPtrTy), 3582 IntTy, 3583 IntTy, 3584 getPointerType(VoidPtrTy), 3585 (BlockHasCopyDispose ? 3586 getPointerType(getBlockDescriptorExtendedType()) : 3587 getPointerType(getBlockDescriptorType())) 3588 }; 3589 3590 const char *FieldNames[] = { 3591 "__isa", 3592 "__flags", 3593 "__reserved", 3594 "__FuncPtr", 3595 "__descriptor" 3596 }; 3597 3598 for (size_t i = 0; i < 5; ++i) { 3599 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3600 &Idents.get(FieldNames[i]), 3601 FieldTypes[i], /*TInfo=*/0, 3602 /*BitWidth=*/0, /*Mutable=*/false); 3603 Field->setAccess(AS_public); 3604 T->addDecl(Field); 3605 } 3606 3607 for (unsigned i = 0; i < Layout.size(); ++i) { 3608 const Expr *E = Layout[i]; 3609 3610 QualType FieldType = E->getType(); 3611 IdentifierInfo *FieldName = 0; 3612 if (isa<CXXThisExpr>(E)) { 3613 FieldName = &Idents.get("this"); 3614 } else if (const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E)) { 3615 const ValueDecl *D = BDRE->getDecl(); 3616 FieldName = D->getIdentifier(); 3617 if (BDRE->isByRef()) 3618 FieldType = BuildByRefType(D->getName(), FieldType); 3619 } else { 3620 // Padding. 3621 assert(isa<ConstantArrayType>(FieldType) && 3622 isa<DeclRefExpr>(E) && 3623 !cast<DeclRefExpr>(E)->getDecl()->getDeclName() && 3624 "doesn't match characteristics of padding decl"); 3625 } 3626 3627 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3628 FieldName, FieldType, /*TInfo=*/0, 3629 /*BitWidth=*/0, /*Mutable=*/false); 3630 Field->setAccess(AS_public); 3631 T->addDecl(Field); 3632 } 3633 3634 T->completeDefinition(); 3635 3636 return getPointerType(getTagDeclType(T)); 3637} 3638 3639void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3640 const RecordType *Rec = T->getAs<RecordType>(); 3641 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3642 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3643} 3644 3645// This returns true if a type has been typedefed to BOOL: 3646// typedef <type> BOOL; 3647static bool isTypeTypedefedAsBOOL(QualType T) { 3648 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3649 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3650 return II->isStr("BOOL"); 3651 3652 return false; 3653} 3654 3655/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3656/// purpose. 3657CharUnits ASTContext::getObjCEncodingTypeSize(QualType type) const { 3658 CharUnits sz = getTypeSizeInChars(type); 3659 3660 // Make all integer and enum types at least as large as an int 3661 if (sz.isPositive() && type->isIntegralOrEnumerationType()) 3662 sz = std::max(sz, getTypeSizeInChars(IntTy)); 3663 // Treat arrays as pointers, since that's how they're passed in. 3664 else if (type->isArrayType()) 3665 sz = getTypeSizeInChars(VoidPtrTy); 3666 return sz; 3667} 3668 3669static inline 3670std::string charUnitsToString(const CharUnits &CU) { 3671 return llvm::itostr(CU.getQuantity()); 3672} 3673 3674/// getObjCEncodingForBlockDecl - Return the encoded type for this block 3675/// declaration. 3676void ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr, 3677 std::string& S) const { 3678 const BlockDecl *Decl = Expr->getBlockDecl(); 3679 QualType BlockTy = 3680 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3681 // Encode result type. 3682 getObjCEncodingForType(BlockTy->getAs<FunctionType>()->getResultType(), S); 3683 // Compute size of all parameters. 3684 // Start with computing size of a pointer in number of bytes. 3685 // FIXME: There might(should) be a better way of doing this computation! 3686 SourceLocation Loc; 3687 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3688 CharUnits ParmOffset = PtrSize; 3689 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), 3690 E = Decl->param_end(); PI != E; ++PI) { 3691 QualType PType = (*PI)->getType(); 3692 CharUnits sz = getObjCEncodingTypeSize(PType); 3693 assert (sz.isPositive() && "BlockExpr - Incomplete param type"); 3694 ParmOffset += sz; 3695 } 3696 // Size of the argument frame 3697 S += charUnitsToString(ParmOffset); 3698 // Block pointer and offset. 3699 S += "@?0"; 3700 ParmOffset = PtrSize; 3701 3702 // Argument types. 3703 ParmOffset = PtrSize; 3704 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3705 Decl->param_end(); PI != E; ++PI) { 3706 ParmVarDecl *PVDecl = *PI; 3707 QualType PType = PVDecl->getOriginalType(); 3708 if (const ArrayType *AT = 3709 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3710 // Use array's original type only if it has known number of 3711 // elements. 3712 if (!isa<ConstantArrayType>(AT)) 3713 PType = PVDecl->getType(); 3714 } else if (PType->isFunctionType()) 3715 PType = PVDecl->getType(); 3716 getObjCEncodingForType(PType, S); 3717 S += charUnitsToString(ParmOffset); 3718 ParmOffset += getObjCEncodingTypeSize(PType); 3719 } 3720} 3721 3722void ASTContext::getObjCEncodingForFunctionDecl(const FunctionDecl *Decl, 3723 std::string& S) { 3724 // Encode result type. 3725 getObjCEncodingForType(Decl->getResultType(), S); 3726 CharUnits ParmOffset; 3727 // Compute size of all parameters. 3728 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3729 E = Decl->param_end(); PI != E; ++PI) { 3730 QualType PType = (*PI)->getType(); 3731 CharUnits sz = getObjCEncodingTypeSize(PType); 3732 assert (sz.isPositive() && 3733 "getObjCEncodingForMethodDecl - Incomplete param type"); 3734 ParmOffset += sz; 3735 } 3736 S += charUnitsToString(ParmOffset); 3737 ParmOffset = CharUnits::Zero(); 3738 3739 // Argument types. 3740 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3741 E = Decl->param_end(); PI != E; ++PI) { 3742 ParmVarDecl *PVDecl = *PI; 3743 QualType PType = PVDecl->getOriginalType(); 3744 if (const ArrayType *AT = 3745 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3746 // Use array's original type only if it has known number of 3747 // elements. 3748 if (!isa<ConstantArrayType>(AT)) 3749 PType = PVDecl->getType(); 3750 } else if (PType->isFunctionType()) 3751 PType = PVDecl->getType(); 3752 getObjCEncodingForType(PType, S); 3753 S += charUnitsToString(ParmOffset); 3754 ParmOffset += getObjCEncodingTypeSize(PType); 3755 } 3756} 3757 3758/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3759/// declaration. 3760void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3761 std::string& S) const { 3762 // FIXME: This is not very efficient. 3763 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3764 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3765 // Encode result type. 3766 getObjCEncodingForType(Decl->getResultType(), S); 3767 // Compute size of all parameters. 3768 // Start with computing size of a pointer in number of bytes. 3769 // FIXME: There might(should) be a better way of doing this computation! 3770 SourceLocation Loc; 3771 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3772 // The first two arguments (self and _cmd) are pointers; account for 3773 // their size. 3774 CharUnits ParmOffset = 2 * PtrSize; 3775 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3776 E = Decl->sel_param_end(); PI != E; ++PI) { 3777 QualType PType = (*PI)->getType(); 3778 CharUnits sz = getObjCEncodingTypeSize(PType); 3779 assert (sz.isPositive() && 3780 "getObjCEncodingForMethodDecl - Incomplete param type"); 3781 ParmOffset += sz; 3782 } 3783 S += charUnitsToString(ParmOffset); 3784 S += "@0:"; 3785 S += charUnitsToString(PtrSize); 3786 3787 // Argument types. 3788 ParmOffset = 2 * PtrSize; 3789 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3790 E = Decl->sel_param_end(); PI != E; ++PI) { 3791 ParmVarDecl *PVDecl = *PI; 3792 QualType PType = PVDecl->getOriginalType(); 3793 if (const ArrayType *AT = 3794 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3795 // Use array's original type only if it has known number of 3796 // elements. 3797 if (!isa<ConstantArrayType>(AT)) 3798 PType = PVDecl->getType(); 3799 } else if (PType->isFunctionType()) 3800 PType = PVDecl->getType(); 3801 // Process argument qualifiers for user supplied arguments; such as, 3802 // 'in', 'inout', etc. 3803 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3804 getObjCEncodingForType(PType, S); 3805 S += charUnitsToString(ParmOffset); 3806 ParmOffset += getObjCEncodingTypeSize(PType); 3807 } 3808} 3809 3810/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3811/// property declaration. If non-NULL, Container must be either an 3812/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3813/// NULL when getting encodings for protocol properties. 3814/// Property attributes are stored as a comma-delimited C string. The simple 3815/// attributes readonly and bycopy are encoded as single characters. The 3816/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3817/// encoded as single characters, followed by an identifier. Property types 3818/// are also encoded as a parametrized attribute. The characters used to encode 3819/// these attributes are defined by the following enumeration: 3820/// @code 3821/// enum PropertyAttributes { 3822/// kPropertyReadOnly = 'R', // property is read-only. 3823/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3824/// kPropertyByref = '&', // property is a reference to the value last assigned 3825/// kPropertyDynamic = 'D', // property is dynamic 3826/// kPropertyGetter = 'G', // followed by getter selector name 3827/// kPropertySetter = 'S', // followed by setter selector name 3828/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3829/// kPropertyType = 't' // followed by old-style type encoding. 3830/// kPropertyWeak = 'W' // 'weak' property 3831/// kPropertyStrong = 'P' // property GC'able 3832/// kPropertyNonAtomic = 'N' // property non-atomic 3833/// }; 3834/// @endcode 3835void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3836 const Decl *Container, 3837 std::string& S) const { 3838 // Collect information from the property implementation decl(s). 3839 bool Dynamic = false; 3840 ObjCPropertyImplDecl *SynthesizePID = 0; 3841 3842 // FIXME: Duplicated code due to poor abstraction. 3843 if (Container) { 3844 if (const ObjCCategoryImplDecl *CID = 3845 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3846 for (ObjCCategoryImplDecl::propimpl_iterator 3847 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3848 i != e; ++i) { 3849 ObjCPropertyImplDecl *PID = *i; 3850 if (PID->getPropertyDecl() == PD) { 3851 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3852 Dynamic = true; 3853 } else { 3854 SynthesizePID = PID; 3855 } 3856 } 3857 } 3858 } else { 3859 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3860 for (ObjCCategoryImplDecl::propimpl_iterator 3861 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3862 i != e; ++i) { 3863 ObjCPropertyImplDecl *PID = *i; 3864 if (PID->getPropertyDecl() == PD) { 3865 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3866 Dynamic = true; 3867 } else { 3868 SynthesizePID = PID; 3869 } 3870 } 3871 } 3872 } 3873 } 3874 3875 // FIXME: This is not very efficient. 3876 S = "T"; 3877 3878 // Encode result type. 3879 // GCC has some special rules regarding encoding of properties which 3880 // closely resembles encoding of ivars. 3881 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3882 true /* outermost type */, 3883 true /* encoding for property */); 3884 3885 if (PD->isReadOnly()) { 3886 S += ",R"; 3887 } else { 3888 switch (PD->getSetterKind()) { 3889 case ObjCPropertyDecl::Assign: break; 3890 case ObjCPropertyDecl::Copy: S += ",C"; break; 3891 case ObjCPropertyDecl::Retain: S += ",&"; break; 3892 } 3893 } 3894 3895 // It really isn't clear at all what this means, since properties 3896 // are "dynamic by default". 3897 if (Dynamic) 3898 S += ",D"; 3899 3900 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3901 S += ",N"; 3902 3903 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3904 S += ",G"; 3905 S += PD->getGetterName().getAsString(); 3906 } 3907 3908 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3909 S += ",S"; 3910 S += PD->getSetterName().getAsString(); 3911 } 3912 3913 if (SynthesizePID) { 3914 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3915 S += ",V"; 3916 S += OID->getNameAsString(); 3917 } 3918 3919 // FIXME: OBJCGC: weak & strong 3920} 3921 3922/// getLegacyIntegralTypeEncoding - 3923/// Another legacy compatibility encoding: 32-bit longs are encoded as 3924/// 'l' or 'L' , but not always. For typedefs, we need to use 3925/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3926/// 3927void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3928 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3929 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3930 if (BT->getKind() == BuiltinType::ULong && getIntWidth(PointeeTy) == 32) 3931 PointeeTy = UnsignedIntTy; 3932 else 3933 if (BT->getKind() == BuiltinType::Long && getIntWidth(PointeeTy) == 32) 3934 PointeeTy = IntTy; 3935 } 3936 } 3937} 3938 3939void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3940 const FieldDecl *Field) const { 3941 // We follow the behavior of gcc, expanding structures which are 3942 // directly pointed to, and expanding embedded structures. Note that 3943 // these rules are sufficient to prevent recursive encoding of the 3944 // same type. 3945 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3946 true /* outermost type */); 3947} 3948 3949static char ObjCEncodingForPrimitiveKind(const ASTContext *C, QualType T) { 3950 switch (T->getAs<BuiltinType>()->getKind()) { 3951 default: assert(0 && "Unhandled builtin type kind"); 3952 case BuiltinType::Void: return 'v'; 3953 case BuiltinType::Bool: return 'B'; 3954 case BuiltinType::Char_U: 3955 case BuiltinType::UChar: return 'C'; 3956 case BuiltinType::UShort: return 'S'; 3957 case BuiltinType::UInt: return 'I'; 3958 case BuiltinType::ULong: 3959 return C->getIntWidth(T) == 32 ? 'L' : 'Q'; 3960 case BuiltinType::UInt128: return 'T'; 3961 case BuiltinType::ULongLong: return 'Q'; 3962 case BuiltinType::Char_S: 3963 case BuiltinType::SChar: return 'c'; 3964 case BuiltinType::Short: return 's'; 3965 case BuiltinType::WChar_S: 3966 case BuiltinType::WChar_U: 3967 case BuiltinType::Int: return 'i'; 3968 case BuiltinType::Long: 3969 return C->getIntWidth(T) == 32 ? 'l' : 'q'; 3970 case BuiltinType::LongLong: return 'q'; 3971 case BuiltinType::Int128: return 't'; 3972 case BuiltinType::Float: return 'f'; 3973 case BuiltinType::Double: return 'd'; 3974 case BuiltinType::LongDouble: return 'D'; 3975 } 3976} 3977 3978static void EncodeBitField(const ASTContext *Ctx, std::string& S, 3979 QualType T, const FieldDecl *FD) { 3980 const Expr *E = FD->getBitWidth(); 3981 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3982 S += 'b'; 3983 // The NeXT runtime encodes bit fields as b followed by the number of bits. 3984 // The GNU runtime requires more information; bitfields are encoded as b, 3985 // then the offset (in bits) of the first element, then the type of the 3986 // bitfield, then the size in bits. For example, in this structure: 3987 // 3988 // struct 3989 // { 3990 // int integer; 3991 // int flags:2; 3992 // }; 3993 // On a 32-bit system, the encoding for flags would be b2 for the NeXT 3994 // runtime, but b32i2 for the GNU runtime. The reason for this extra 3995 // information is not especially sensible, but we're stuck with it for 3996 // compatibility with GCC, although providing it breaks anything that 3997 // actually uses runtime introspection and wants to work on both runtimes... 3998 if (!Ctx->getLangOptions().NeXTRuntime) { 3999 const RecordDecl *RD = FD->getParent(); 4000 const ASTRecordLayout &RL = Ctx->getASTRecordLayout(RD); 4001 // FIXME: This same linear search is also used in ExprConstant - it might 4002 // be better if the FieldDecl stored its offset. We'd be increasing the 4003 // size of the object slightly, but saving some time every time it is used. 4004 unsigned i = 0; 4005 for (RecordDecl::field_iterator Field = RD->field_begin(), 4006 FieldEnd = RD->field_end(); 4007 Field != FieldEnd; (void)++Field, ++i) { 4008 if (*Field == FD) 4009 break; 4010 } 4011 S += llvm::utostr(RL.getFieldOffset(i)); 4012 if (T->isEnumeralType()) 4013 S += 'i'; 4014 else 4015 S += ObjCEncodingForPrimitiveKind(Ctx, T); 4016 } 4017 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 4018 S += llvm::utostr(N); 4019} 4020 4021// FIXME: Use SmallString for accumulating string. 4022void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 4023 bool ExpandPointedToStructures, 4024 bool ExpandStructures, 4025 const FieldDecl *FD, 4026 bool OutermostType, 4027 bool EncodingProperty) const { 4028 if (T->getAs<BuiltinType>()) { 4029 if (FD && FD->isBitField()) 4030 return EncodeBitField(this, S, T, FD); 4031 S += ObjCEncodingForPrimitiveKind(this, T); 4032 return; 4033 } 4034 4035 if (const ComplexType *CT = T->getAs<ComplexType>()) { 4036 S += 'j'; 4037 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 4038 false); 4039 return; 4040 } 4041 4042 // encoding for pointer or r3eference types. 4043 QualType PointeeTy; 4044 if (const PointerType *PT = T->getAs<PointerType>()) { 4045 if (PT->isObjCSelType()) { 4046 S += ':'; 4047 return; 4048 } 4049 PointeeTy = PT->getPointeeType(); 4050 } 4051 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 4052 PointeeTy = RT->getPointeeType(); 4053 if (!PointeeTy.isNull()) { 4054 bool isReadOnly = false; 4055 // For historical/compatibility reasons, the read-only qualifier of the 4056 // pointee gets emitted _before_ the '^'. The read-only qualifier of 4057 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 4058 // Also, do not emit the 'r' for anything but the outermost type! 4059 if (isa<TypedefType>(T.getTypePtr())) { 4060 if (OutermostType && T.isConstQualified()) { 4061 isReadOnly = true; 4062 S += 'r'; 4063 } 4064 } else if (OutermostType) { 4065 QualType P = PointeeTy; 4066 while (P->getAs<PointerType>()) 4067 P = P->getAs<PointerType>()->getPointeeType(); 4068 if (P.isConstQualified()) { 4069 isReadOnly = true; 4070 S += 'r'; 4071 } 4072 } 4073 if (isReadOnly) { 4074 // Another legacy compatibility encoding. Some ObjC qualifier and type 4075 // combinations need to be rearranged. 4076 // Rewrite "in const" from "nr" to "rn" 4077 if (llvm::StringRef(S).endswith("nr")) 4078 S.replace(S.end()-2, S.end(), "rn"); 4079 } 4080 4081 if (PointeeTy->isCharType()) { 4082 // char pointer types should be encoded as '*' unless it is a 4083 // type that has been typedef'd to 'BOOL'. 4084 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 4085 S += '*'; 4086 return; 4087 } 4088 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 4089 // GCC binary compat: Need to convert "struct objc_class *" to "#". 4090 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 4091 S += '#'; 4092 return; 4093 } 4094 // GCC binary compat: Need to convert "struct objc_object *" to "@". 4095 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 4096 S += '@'; 4097 return; 4098 } 4099 // fall through... 4100 } 4101 S += '^'; 4102 getLegacyIntegralTypeEncoding(PointeeTy); 4103 4104 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 4105 NULL); 4106 return; 4107 } 4108 4109 if (const ArrayType *AT = 4110 // Ignore type qualifiers etc. 4111 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 4112 if (isa<IncompleteArrayType>(AT)) { 4113 // Incomplete arrays are encoded as a pointer to the array element. 4114 S += '^'; 4115 4116 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4117 false, ExpandStructures, FD); 4118 } else { 4119 S += '['; 4120 4121 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 4122 S += llvm::utostr(CAT->getSize().getZExtValue()); 4123 else { 4124 //Variable length arrays are encoded as a regular array with 0 elements. 4125 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 4126 S += '0'; 4127 } 4128 4129 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4130 false, ExpandStructures, FD); 4131 S += ']'; 4132 } 4133 return; 4134 } 4135 4136 if (T->getAs<FunctionType>()) { 4137 S += '?'; 4138 return; 4139 } 4140 4141 if (const RecordType *RTy = T->getAs<RecordType>()) { 4142 RecordDecl *RDecl = RTy->getDecl(); 4143 S += RDecl->isUnion() ? '(' : '{'; 4144 // Anonymous structures print as '?' 4145 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 4146 S += II->getName(); 4147 if (ClassTemplateSpecializationDecl *Spec 4148 = dyn_cast<ClassTemplateSpecializationDecl>(RDecl)) { 4149 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 4150 std::string TemplateArgsStr 4151 = TemplateSpecializationType::PrintTemplateArgumentList( 4152 TemplateArgs.data(), 4153 TemplateArgs.size(), 4154 (*this).PrintingPolicy); 4155 4156 S += TemplateArgsStr; 4157 } 4158 } else { 4159 S += '?'; 4160 } 4161 if (ExpandStructures) { 4162 S += '='; 4163 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 4164 FieldEnd = RDecl->field_end(); 4165 Field != FieldEnd; ++Field) { 4166 if (FD) { 4167 S += '"'; 4168 S += Field->getNameAsString(); 4169 S += '"'; 4170 } 4171 4172 // Special case bit-fields. 4173 if (Field->isBitField()) { 4174 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 4175 (*Field)); 4176 } else { 4177 QualType qt = Field->getType(); 4178 getLegacyIntegralTypeEncoding(qt); 4179 getObjCEncodingForTypeImpl(qt, S, false, true, 4180 FD); 4181 } 4182 } 4183 } 4184 S += RDecl->isUnion() ? ')' : '}'; 4185 return; 4186 } 4187 4188 if (T->isEnumeralType()) { 4189 if (FD && FD->isBitField()) 4190 EncodeBitField(this, S, T, FD); 4191 else 4192 S += 'i'; 4193 return; 4194 } 4195 4196 if (T->isBlockPointerType()) { 4197 S += "@?"; // Unlike a pointer-to-function, which is "^?". 4198 return; 4199 } 4200 4201 // Ignore protocol qualifiers when mangling at this level. 4202 if (const ObjCObjectType *OT = T->getAs<ObjCObjectType>()) 4203 T = OT->getBaseType(); 4204 4205 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 4206 // @encode(class_name) 4207 ObjCInterfaceDecl *OI = OIT->getDecl(); 4208 S += '{'; 4209 const IdentifierInfo *II = OI->getIdentifier(); 4210 S += II->getName(); 4211 S += '='; 4212 llvm::SmallVector<ObjCIvarDecl*, 32> Ivars; 4213 DeepCollectObjCIvars(OI, true, Ivars); 4214 for (unsigned i = 0, e = Ivars.size(); i != e; ++i) { 4215 FieldDecl *Field = cast<FieldDecl>(Ivars[i]); 4216 if (Field->isBitField()) 4217 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, Field); 4218 else 4219 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, FD); 4220 } 4221 S += '}'; 4222 return; 4223 } 4224 4225 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 4226 if (OPT->isObjCIdType()) { 4227 S += '@'; 4228 return; 4229 } 4230 4231 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 4232 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 4233 // Since this is a binary compatibility issue, need to consult with runtime 4234 // folks. Fortunately, this is a *very* obsure construct. 4235 S += '#'; 4236 return; 4237 } 4238 4239 if (OPT->isObjCQualifiedIdType()) { 4240 getObjCEncodingForTypeImpl(getObjCIdType(), S, 4241 ExpandPointedToStructures, 4242 ExpandStructures, FD); 4243 if (FD || EncodingProperty) { 4244 // Note that we do extended encoding of protocol qualifer list 4245 // Only when doing ivar or property encoding. 4246 S += '"'; 4247 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4248 E = OPT->qual_end(); I != E; ++I) { 4249 S += '<'; 4250 S += (*I)->getNameAsString(); 4251 S += '>'; 4252 } 4253 S += '"'; 4254 } 4255 return; 4256 } 4257 4258 QualType PointeeTy = OPT->getPointeeType(); 4259 if (!EncodingProperty && 4260 isa<TypedefType>(PointeeTy.getTypePtr())) { 4261 // Another historical/compatibility reason. 4262 // We encode the underlying type which comes out as 4263 // {...}; 4264 S += '^'; 4265 getObjCEncodingForTypeImpl(PointeeTy, S, 4266 false, ExpandPointedToStructures, 4267 NULL); 4268 return; 4269 } 4270 4271 S += '@'; 4272 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 4273 S += '"'; 4274 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 4275 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4276 E = OPT->qual_end(); I != E; ++I) { 4277 S += '<'; 4278 S += (*I)->getNameAsString(); 4279 S += '>'; 4280 } 4281 S += '"'; 4282 } 4283 return; 4284 } 4285 4286 // gcc just blithely ignores member pointers. 4287 // TODO: maybe there should be a mangling for these 4288 if (T->getAs<MemberPointerType>()) 4289 return; 4290 4291 if (T->isVectorType()) { 4292 // This matches gcc's encoding, even though technically it is 4293 // insufficient. 4294 // FIXME. We should do a better job than gcc. 4295 return; 4296 } 4297 4298 assert(0 && "@encode for type not implemented!"); 4299} 4300 4301void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 4302 std::string& S) const { 4303 if (QT & Decl::OBJC_TQ_In) 4304 S += 'n'; 4305 if (QT & Decl::OBJC_TQ_Inout) 4306 S += 'N'; 4307 if (QT & Decl::OBJC_TQ_Out) 4308 S += 'o'; 4309 if (QT & Decl::OBJC_TQ_Bycopy) 4310 S += 'O'; 4311 if (QT & Decl::OBJC_TQ_Byref) 4312 S += 'R'; 4313 if (QT & Decl::OBJC_TQ_Oneway) 4314 S += 'V'; 4315} 4316 4317void ASTContext::setBuiltinVaListType(QualType T) { 4318 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 4319 4320 BuiltinVaListType = T; 4321} 4322 4323void ASTContext::setObjCIdType(QualType T) { 4324 ObjCIdTypedefType = T; 4325} 4326 4327void ASTContext::setObjCSelType(QualType T) { 4328 ObjCSelTypedefType = T; 4329} 4330 4331void ASTContext::setObjCProtoType(QualType QT) { 4332 ObjCProtoType = QT; 4333} 4334 4335void ASTContext::setObjCClassType(QualType T) { 4336 ObjCClassTypedefType = T; 4337} 4338 4339void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 4340 assert(ObjCConstantStringType.isNull() && 4341 "'NSConstantString' type already set!"); 4342 4343 ObjCConstantStringType = getObjCInterfaceType(Decl); 4344} 4345 4346/// \brief Retrieve the template name that corresponds to a non-empty 4347/// lookup. 4348TemplateName 4349ASTContext::getOverloadedTemplateName(UnresolvedSetIterator Begin, 4350 UnresolvedSetIterator End) const { 4351 unsigned size = End - Begin; 4352 assert(size > 1 && "set is not overloaded!"); 4353 4354 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 4355 size * sizeof(FunctionTemplateDecl*)); 4356 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 4357 4358 NamedDecl **Storage = OT->getStorage(); 4359 for (UnresolvedSetIterator I = Begin; I != End; ++I) { 4360 NamedDecl *D = *I; 4361 assert(isa<FunctionTemplateDecl>(D) || 4362 (isa<UsingShadowDecl>(D) && 4363 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 4364 *Storage++ = D; 4365 } 4366 4367 return TemplateName(OT); 4368} 4369 4370/// \brief Retrieve the template name that represents a qualified 4371/// template name such as \c std::vector. 4372TemplateName 4373ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 4374 bool TemplateKeyword, 4375 TemplateDecl *Template) const { 4376 // FIXME: Canonicalization? 4377 llvm::FoldingSetNodeID ID; 4378 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 4379 4380 void *InsertPos = 0; 4381 QualifiedTemplateName *QTN = 4382 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4383 if (!QTN) { 4384 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 4385 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 4386 } 4387 4388 return TemplateName(QTN); 4389} 4390 4391/// \brief Retrieve the template name that represents a dependent 4392/// template name such as \c MetaFun::template apply. 4393TemplateName 4394ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4395 const IdentifierInfo *Name) const { 4396 assert((!NNS || NNS->isDependent()) && 4397 "Nested name specifier must be dependent"); 4398 4399 llvm::FoldingSetNodeID ID; 4400 DependentTemplateName::Profile(ID, NNS, Name); 4401 4402 void *InsertPos = 0; 4403 DependentTemplateName *QTN = 4404 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4405 4406 if (QTN) 4407 return TemplateName(QTN); 4408 4409 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4410 if (CanonNNS == NNS) { 4411 QTN = new (*this,4) DependentTemplateName(NNS, Name); 4412 } else { 4413 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 4414 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 4415 DependentTemplateName *CheckQTN = 4416 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4417 assert(!CheckQTN && "Dependent type name canonicalization broken"); 4418 (void)CheckQTN; 4419 } 4420 4421 DependentTemplateNames.InsertNode(QTN, InsertPos); 4422 return TemplateName(QTN); 4423} 4424 4425/// \brief Retrieve the template name that represents a dependent 4426/// template name such as \c MetaFun::template operator+. 4427TemplateName 4428ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4429 OverloadedOperatorKind Operator) const { 4430 assert((!NNS || NNS->isDependent()) && 4431 "Nested name specifier must be dependent"); 4432 4433 llvm::FoldingSetNodeID ID; 4434 DependentTemplateName::Profile(ID, NNS, Operator); 4435 4436 void *InsertPos = 0; 4437 DependentTemplateName *QTN 4438 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4439 4440 if (QTN) 4441 return TemplateName(QTN); 4442 4443 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4444 if (CanonNNS == NNS) { 4445 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 4446 } else { 4447 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 4448 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 4449 4450 DependentTemplateName *CheckQTN 4451 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4452 assert(!CheckQTN && "Dependent template name canonicalization broken"); 4453 (void)CheckQTN; 4454 } 4455 4456 DependentTemplateNames.InsertNode(QTN, InsertPos); 4457 return TemplateName(QTN); 4458} 4459 4460TemplateName 4461ASTContext::getSubstTemplateTemplateParmPack(TemplateTemplateParmDecl *Param, 4462 const TemplateArgument &ArgPack) const { 4463 ASTContext &Self = const_cast<ASTContext &>(*this); 4464 llvm::FoldingSetNodeID ID; 4465 SubstTemplateTemplateParmPackStorage::Profile(ID, Self, Param, ArgPack); 4466 4467 void *InsertPos = 0; 4468 SubstTemplateTemplateParmPackStorage *Subst 4469 = SubstTemplateTemplateParmPacks.FindNodeOrInsertPos(ID, InsertPos); 4470 4471 if (!Subst) { 4472 Subst = new (*this) SubstTemplateTemplateParmPackStorage(Self, Param, 4473 ArgPack.pack_size(), 4474 ArgPack.pack_begin()); 4475 SubstTemplateTemplateParmPacks.InsertNode(Subst, InsertPos); 4476 } 4477 4478 return TemplateName(Subst); 4479} 4480 4481/// getFromTargetType - Given one of the integer types provided by 4482/// TargetInfo, produce the corresponding type. The unsigned @p Type 4483/// is actually a value of type @c TargetInfo::IntType. 4484CanQualType ASTContext::getFromTargetType(unsigned Type) const { 4485 switch (Type) { 4486 case TargetInfo::NoInt: return CanQualType(); 4487 case TargetInfo::SignedShort: return ShortTy; 4488 case TargetInfo::UnsignedShort: return UnsignedShortTy; 4489 case TargetInfo::SignedInt: return IntTy; 4490 case TargetInfo::UnsignedInt: return UnsignedIntTy; 4491 case TargetInfo::SignedLong: return LongTy; 4492 case TargetInfo::UnsignedLong: return UnsignedLongTy; 4493 case TargetInfo::SignedLongLong: return LongLongTy; 4494 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 4495 } 4496 4497 assert(false && "Unhandled TargetInfo::IntType value"); 4498 return CanQualType(); 4499} 4500 4501//===----------------------------------------------------------------------===// 4502// Type Predicates. 4503//===----------------------------------------------------------------------===// 4504 4505/// isObjCNSObjectType - Return true if this is an NSObject object using 4506/// NSObject attribute on a c-style pointer type. 4507/// FIXME - Make it work directly on types. 4508/// FIXME: Move to Type. 4509/// 4510bool ASTContext::isObjCNSObjectType(QualType Ty) const { 4511 if (const TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 4512 if (TypedefDecl *TD = TDT->getDecl()) 4513 if (TD->getAttr<ObjCNSObjectAttr>()) 4514 return true; 4515 } 4516 return false; 4517} 4518 4519/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 4520/// garbage collection attribute. 4521/// 4522Qualifiers::GC ASTContext::getObjCGCAttrKind(QualType Ty) const { 4523 if (getLangOptions().getGCMode() == LangOptions::NonGC) 4524 return Qualifiers::GCNone; 4525 4526 assert(getLangOptions().ObjC1); 4527 Qualifiers::GC GCAttrs = Ty.getObjCGCAttr(); 4528 4529 // Default behaviour under objective-C's gc is for ObjC pointers 4530 // (or pointers to them) be treated as though they were declared 4531 // as __strong. 4532 if (GCAttrs == Qualifiers::GCNone) { 4533 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 4534 return Qualifiers::Strong; 4535 else if (Ty->isPointerType()) 4536 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 4537 } else { 4538 // It's not valid to set GC attributes on anything that isn't a 4539 // pointer. 4540#ifndef NDEBUG 4541 QualType CT = Ty->getCanonicalTypeInternal(); 4542 while (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 4543 CT = AT->getElementType(); 4544 assert(CT->isAnyPointerType() || CT->isBlockPointerType()); 4545#endif 4546 } 4547 return GCAttrs; 4548} 4549 4550//===----------------------------------------------------------------------===// 4551// Type Compatibility Testing 4552//===----------------------------------------------------------------------===// 4553 4554/// areCompatVectorTypes - Return true if the two specified vector types are 4555/// compatible. 4556static bool areCompatVectorTypes(const VectorType *LHS, 4557 const VectorType *RHS) { 4558 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 4559 return LHS->getElementType() == RHS->getElementType() && 4560 LHS->getNumElements() == RHS->getNumElements(); 4561} 4562 4563bool ASTContext::areCompatibleVectorTypes(QualType FirstVec, 4564 QualType SecondVec) { 4565 assert(FirstVec->isVectorType() && "FirstVec should be a vector type"); 4566 assert(SecondVec->isVectorType() && "SecondVec should be a vector type"); 4567 4568 if (hasSameUnqualifiedType(FirstVec, SecondVec)) 4569 return true; 4570 4571 // Treat Neon vector types and most AltiVec vector types as if they are the 4572 // equivalent GCC vector types. 4573 const VectorType *First = FirstVec->getAs<VectorType>(); 4574 const VectorType *Second = SecondVec->getAs<VectorType>(); 4575 if (First->getNumElements() == Second->getNumElements() && 4576 hasSameType(First->getElementType(), Second->getElementType()) && 4577 First->getVectorKind() != VectorType::AltiVecPixel && 4578 First->getVectorKind() != VectorType::AltiVecBool && 4579 Second->getVectorKind() != VectorType::AltiVecPixel && 4580 Second->getVectorKind() != VectorType::AltiVecBool) 4581 return true; 4582 4583 return false; 4584} 4585 4586//===----------------------------------------------------------------------===// 4587// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 4588//===----------------------------------------------------------------------===// 4589 4590/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 4591/// inheritance hierarchy of 'rProto'. 4592bool 4593ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 4594 ObjCProtocolDecl *rProto) const { 4595 if (lProto == rProto) 4596 return true; 4597 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 4598 E = rProto->protocol_end(); PI != E; ++PI) 4599 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 4600 return true; 4601 return false; 4602} 4603 4604/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 4605/// return true if lhs's protocols conform to rhs's protocol; false 4606/// otherwise. 4607bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 4608 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 4609 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 4610 return false; 4611} 4612 4613/// ObjCQualifiedClassTypesAreCompatible - compare Class<p,...> and 4614/// Class<p1, ...>. 4615bool ASTContext::ObjCQualifiedClassTypesAreCompatible(QualType lhs, 4616 QualType rhs) { 4617 const ObjCObjectPointerType *lhsQID = lhs->getAs<ObjCObjectPointerType>(); 4618 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4619 assert ((lhsQID && rhsOPT) && "ObjCQualifiedClassTypesAreCompatible"); 4620 4621 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4622 E = lhsQID->qual_end(); I != E; ++I) { 4623 bool match = false; 4624 ObjCProtocolDecl *lhsProto = *I; 4625 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4626 E = rhsOPT->qual_end(); J != E; ++J) { 4627 ObjCProtocolDecl *rhsProto = *J; 4628 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto)) { 4629 match = true; 4630 break; 4631 } 4632 } 4633 if (!match) 4634 return false; 4635 } 4636 return true; 4637} 4638 4639/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 4640/// ObjCQualifiedIDType. 4641bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 4642 bool compare) { 4643 // Allow id<P..> and an 'id' or void* type in all cases. 4644 if (lhs->isVoidPointerType() || 4645 lhs->isObjCIdType() || lhs->isObjCClassType()) 4646 return true; 4647 else if (rhs->isVoidPointerType() || 4648 rhs->isObjCIdType() || rhs->isObjCClassType()) 4649 return true; 4650 4651 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 4652 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4653 4654 if (!rhsOPT) return false; 4655 4656 if (rhsOPT->qual_empty()) { 4657 // If the RHS is a unqualified interface pointer "NSString*", 4658 // make sure we check the class hierarchy. 4659 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4660 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4661 E = lhsQID->qual_end(); I != E; ++I) { 4662 // when comparing an id<P> on lhs with a static type on rhs, 4663 // see if static class implements all of id's protocols, directly or 4664 // through its super class and categories. 4665 if (!rhsID->ClassImplementsProtocol(*I, true)) 4666 return false; 4667 } 4668 } 4669 // If there are no qualifiers and no interface, we have an 'id'. 4670 return true; 4671 } 4672 // Both the right and left sides have qualifiers. 4673 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4674 E = lhsQID->qual_end(); I != E; ++I) { 4675 ObjCProtocolDecl *lhsProto = *I; 4676 bool match = false; 4677 4678 // when comparing an id<P> on lhs with a static type on rhs, 4679 // see if static class implements all of id's protocols, directly or 4680 // through its super class and categories. 4681 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4682 E = rhsOPT->qual_end(); J != E; ++J) { 4683 ObjCProtocolDecl *rhsProto = *J; 4684 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4685 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4686 match = true; 4687 break; 4688 } 4689 } 4690 // If the RHS is a qualified interface pointer "NSString<P>*", 4691 // make sure we check the class hierarchy. 4692 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4693 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4694 E = lhsQID->qual_end(); I != E; ++I) { 4695 // when comparing an id<P> on lhs with a static type on rhs, 4696 // see if static class implements all of id's protocols, directly or 4697 // through its super class and categories. 4698 if (rhsID->ClassImplementsProtocol(*I, true)) { 4699 match = true; 4700 break; 4701 } 4702 } 4703 } 4704 if (!match) 4705 return false; 4706 } 4707 4708 return true; 4709 } 4710 4711 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 4712 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 4713 4714 if (const ObjCObjectPointerType *lhsOPT = 4715 lhs->getAsObjCInterfacePointerType()) { 4716 // If both the right and left sides have qualifiers. 4717 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 4718 E = lhsOPT->qual_end(); I != E; ++I) { 4719 ObjCProtocolDecl *lhsProto = *I; 4720 bool match = false; 4721 4722 // when comparing an id<P> on rhs with a static type on lhs, 4723 // see if static class implements all of id's protocols, directly or 4724 // through its super class and categories. 4725 // First, lhs protocols in the qualifier list must be found, direct 4726 // or indirect in rhs's qualifier list or it is a mismatch. 4727 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4728 E = rhsQID->qual_end(); J != E; ++J) { 4729 ObjCProtocolDecl *rhsProto = *J; 4730 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4731 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4732 match = true; 4733 break; 4734 } 4735 } 4736 if (!match) 4737 return false; 4738 } 4739 4740 // Static class's protocols, or its super class or category protocols 4741 // must be found, direct or indirect in rhs's qualifier list or it is a mismatch. 4742 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 4743 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4744 CollectInheritedProtocols(lhsID, LHSInheritedProtocols); 4745 // This is rather dubious but matches gcc's behavior. If lhs has 4746 // no type qualifier and its class has no static protocol(s) 4747 // assume that it is mismatch. 4748 if (LHSInheritedProtocols.empty() && lhsOPT->qual_empty()) 4749 return false; 4750 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4751 LHSInheritedProtocols.begin(), 4752 E = LHSInheritedProtocols.end(); I != E; ++I) { 4753 bool match = false; 4754 ObjCProtocolDecl *lhsProto = (*I); 4755 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4756 E = rhsQID->qual_end(); J != E; ++J) { 4757 ObjCProtocolDecl *rhsProto = *J; 4758 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4759 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4760 match = true; 4761 break; 4762 } 4763 } 4764 if (!match) 4765 return false; 4766 } 4767 } 4768 return true; 4769 } 4770 return false; 4771} 4772 4773/// canAssignObjCInterfaces - Return true if the two interface types are 4774/// compatible for assignment from RHS to LHS. This handles validation of any 4775/// protocol qualifiers on the LHS or RHS. 4776/// 4777bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4778 const ObjCObjectPointerType *RHSOPT) { 4779 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4780 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4781 4782 // If either type represents the built-in 'id' or 'Class' types, return true. 4783 if (LHS->isObjCUnqualifiedIdOrClass() || 4784 RHS->isObjCUnqualifiedIdOrClass()) 4785 return true; 4786 4787 if (LHS->isObjCQualifiedId() || RHS->isObjCQualifiedId()) 4788 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4789 QualType(RHSOPT,0), 4790 false); 4791 4792 if (LHS->isObjCQualifiedClass() && RHS->isObjCQualifiedClass()) 4793 return ObjCQualifiedClassTypesAreCompatible(QualType(LHSOPT,0), 4794 QualType(RHSOPT,0)); 4795 4796 // If we have 2 user-defined types, fall into that path. 4797 if (LHS->getInterface() && RHS->getInterface()) 4798 return canAssignObjCInterfaces(LHS, RHS); 4799 4800 return false; 4801} 4802 4803/// canAssignObjCInterfacesInBlockPointer - This routine is specifically written 4804/// for providing type-safty for objective-c pointers used to pass/return 4805/// arguments in block literals. When passed as arguments, passing 'A*' where 4806/// 'id' is expected is not OK. Passing 'Sub *" where 'Super *" is expected is 4807/// not OK. For the return type, the opposite is not OK. 4808bool ASTContext::canAssignObjCInterfacesInBlockPointer( 4809 const ObjCObjectPointerType *LHSOPT, 4810 const ObjCObjectPointerType *RHSOPT) { 4811 if (RHSOPT->isObjCBuiltinType() || LHSOPT->isObjCIdType()) 4812 return true; 4813 4814 if (LHSOPT->isObjCBuiltinType()) { 4815 return RHSOPT->isObjCBuiltinType() || RHSOPT->isObjCQualifiedIdType(); 4816 } 4817 4818 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4819 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4820 QualType(RHSOPT,0), 4821 false); 4822 4823 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4824 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4825 if (LHS && RHS) { // We have 2 user-defined types. 4826 if (LHS != RHS) { 4827 if (LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4828 return false; 4829 if (RHS->getDecl()->isSuperClassOf(LHS->getDecl())) 4830 return true; 4831 } 4832 else 4833 return true; 4834 } 4835 return false; 4836} 4837 4838/// getIntersectionOfProtocols - This routine finds the intersection of set 4839/// of protocols inherited from two distinct objective-c pointer objects. 4840/// It is used to build composite qualifier list of the composite type of 4841/// the conditional expression involving two objective-c pointer objects. 4842static 4843void getIntersectionOfProtocols(ASTContext &Context, 4844 const ObjCObjectPointerType *LHSOPT, 4845 const ObjCObjectPointerType *RHSOPT, 4846 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4847 4848 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4849 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4850 assert(LHS->getInterface() && "LHS must have an interface base"); 4851 assert(RHS->getInterface() && "RHS must have an interface base"); 4852 4853 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4854 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4855 if (LHSNumProtocols > 0) 4856 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4857 else { 4858 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4859 Context.CollectInheritedProtocols(LHS->getInterface(), 4860 LHSInheritedProtocols); 4861 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4862 LHSInheritedProtocols.end()); 4863 } 4864 4865 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4866 if (RHSNumProtocols > 0) { 4867 ObjCProtocolDecl **RHSProtocols = 4868 const_cast<ObjCProtocolDecl **>(RHS->qual_begin()); 4869 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4870 if (InheritedProtocolSet.count(RHSProtocols[i])) 4871 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4872 } 4873 else { 4874 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4875 Context.CollectInheritedProtocols(RHS->getInterface(), 4876 RHSInheritedProtocols); 4877 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4878 RHSInheritedProtocols.begin(), 4879 E = RHSInheritedProtocols.end(); I != E; ++I) 4880 if (InheritedProtocolSet.count((*I))) 4881 IntersectionOfProtocols.push_back((*I)); 4882 } 4883} 4884 4885/// areCommonBaseCompatible - Returns common base class of the two classes if 4886/// one found. Note that this is O'2 algorithm. But it will be called as the 4887/// last type comparison in a ?-exp of ObjC pointer types before a 4888/// warning is issued. So, its invokation is extremely rare. 4889QualType ASTContext::areCommonBaseCompatible( 4890 const ObjCObjectPointerType *Lptr, 4891 const ObjCObjectPointerType *Rptr) { 4892 const ObjCObjectType *LHS = Lptr->getObjectType(); 4893 const ObjCObjectType *RHS = Rptr->getObjectType(); 4894 const ObjCInterfaceDecl* LDecl = LHS->getInterface(); 4895 const ObjCInterfaceDecl* RDecl = RHS->getInterface(); 4896 if (!LDecl || !RDecl) 4897 return QualType(); 4898 4899 while ((LDecl = LDecl->getSuperClass())) { 4900 LHS = cast<ObjCInterfaceType>(getObjCInterfaceType(LDecl)); 4901 if (canAssignObjCInterfaces(LHS, RHS)) { 4902 llvm::SmallVector<ObjCProtocolDecl *, 8> Protocols; 4903 getIntersectionOfProtocols(*this, Lptr, Rptr, Protocols); 4904 4905 QualType Result = QualType(LHS, 0); 4906 if (!Protocols.empty()) 4907 Result = getObjCObjectType(Result, Protocols.data(), Protocols.size()); 4908 Result = getObjCObjectPointerType(Result); 4909 return Result; 4910 } 4911 } 4912 4913 return QualType(); 4914} 4915 4916bool ASTContext::canAssignObjCInterfaces(const ObjCObjectType *LHS, 4917 const ObjCObjectType *RHS) { 4918 assert(LHS->getInterface() && "LHS is not an interface type"); 4919 assert(RHS->getInterface() && "RHS is not an interface type"); 4920 4921 // Verify that the base decls are compatible: the RHS must be a subclass of 4922 // the LHS. 4923 if (!LHS->getInterface()->isSuperClassOf(RHS->getInterface())) 4924 return false; 4925 4926 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4927 // protocol qualified at all, then we are good. 4928 if (LHS->getNumProtocols() == 0) 4929 return true; 4930 4931 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4932 // isn't a superset. 4933 if (RHS->getNumProtocols() == 0) 4934 return true; // FIXME: should return false! 4935 4936 for (ObjCObjectType::qual_iterator LHSPI = LHS->qual_begin(), 4937 LHSPE = LHS->qual_end(); 4938 LHSPI != LHSPE; LHSPI++) { 4939 bool RHSImplementsProtocol = false; 4940 4941 // If the RHS doesn't implement the protocol on the left, the types 4942 // are incompatible. 4943 for (ObjCObjectType::qual_iterator RHSPI = RHS->qual_begin(), 4944 RHSPE = RHS->qual_end(); 4945 RHSPI != RHSPE; RHSPI++) { 4946 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4947 RHSImplementsProtocol = true; 4948 break; 4949 } 4950 } 4951 // FIXME: For better diagnostics, consider passing back the protocol name. 4952 if (!RHSImplementsProtocol) 4953 return false; 4954 } 4955 // The RHS implements all protocols listed on the LHS. 4956 return true; 4957} 4958 4959bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4960 // get the "pointed to" types 4961 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4962 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4963 4964 if (!LHSOPT || !RHSOPT) 4965 return false; 4966 4967 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4968 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4969} 4970 4971bool ASTContext::canBindObjCObjectType(QualType To, QualType From) { 4972 return canAssignObjCInterfaces( 4973 getObjCObjectPointerType(To)->getAs<ObjCObjectPointerType>(), 4974 getObjCObjectPointerType(From)->getAs<ObjCObjectPointerType>()); 4975} 4976 4977/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4978/// both shall have the identically qualified version of a compatible type. 4979/// C99 6.2.7p1: Two types have compatible types if their types are the 4980/// same. See 6.7.[2,3,5] for additional rules. 4981bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS, 4982 bool CompareUnqualified) { 4983 if (getLangOptions().CPlusPlus) 4984 return hasSameType(LHS, RHS); 4985 4986 return !mergeTypes(LHS, RHS, false, CompareUnqualified).isNull(); 4987} 4988 4989bool ASTContext::typesAreBlockPointerCompatible(QualType LHS, QualType RHS) { 4990 return !mergeTypes(LHS, RHS, true).isNull(); 4991} 4992 4993/// mergeTransparentUnionType - if T is a transparent union type and a member 4994/// of T is compatible with SubType, return the merged type, else return 4995/// QualType() 4996QualType ASTContext::mergeTransparentUnionType(QualType T, QualType SubType, 4997 bool OfBlockPointer, 4998 bool Unqualified) { 4999 if (const RecordType *UT = T->getAsUnionType()) { 5000 RecordDecl *UD = UT->getDecl(); 5001 if (UD->hasAttr<TransparentUnionAttr>()) { 5002 for (RecordDecl::field_iterator it = UD->field_begin(), 5003 itend = UD->field_end(); it != itend; ++it) { 5004 QualType ET = it->getType().getUnqualifiedType(); 5005 QualType MT = mergeTypes(ET, SubType, OfBlockPointer, Unqualified); 5006 if (!MT.isNull()) 5007 return MT; 5008 } 5009 } 5010 } 5011 5012 return QualType(); 5013} 5014 5015/// mergeFunctionArgumentTypes - merge two types which appear as function 5016/// argument types 5017QualType ASTContext::mergeFunctionArgumentTypes(QualType lhs, QualType rhs, 5018 bool OfBlockPointer, 5019 bool Unqualified) { 5020 // GNU extension: two types are compatible if they appear as a function 5021 // argument, one of the types is a transparent union type and the other 5022 // type is compatible with a union member 5023 QualType lmerge = mergeTransparentUnionType(lhs, rhs, OfBlockPointer, 5024 Unqualified); 5025 if (!lmerge.isNull()) 5026 return lmerge; 5027 5028 QualType rmerge = mergeTransparentUnionType(rhs, lhs, OfBlockPointer, 5029 Unqualified); 5030 if (!rmerge.isNull()) 5031 return rmerge; 5032 5033 return mergeTypes(lhs, rhs, OfBlockPointer, Unqualified); 5034} 5035 5036QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs, 5037 bool OfBlockPointer, 5038 bool Unqualified) { 5039 const FunctionType *lbase = lhs->getAs<FunctionType>(); 5040 const FunctionType *rbase = rhs->getAs<FunctionType>(); 5041 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 5042 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 5043 bool allLTypes = true; 5044 bool allRTypes = true; 5045 5046 // Check return type 5047 QualType retType; 5048 if (OfBlockPointer) 5049 retType = mergeTypes(rbase->getResultType(), lbase->getResultType(), true, 5050 Unqualified); 5051 else 5052 retType = mergeTypes(lbase->getResultType(), rbase->getResultType(), false, 5053 Unqualified); 5054 if (retType.isNull()) return QualType(); 5055 5056 if (Unqualified) 5057 retType = retType.getUnqualifiedType(); 5058 5059 CanQualType LRetType = getCanonicalType(lbase->getResultType()); 5060 CanQualType RRetType = getCanonicalType(rbase->getResultType()); 5061 if (Unqualified) { 5062 LRetType = LRetType.getUnqualifiedType(); 5063 RRetType = RRetType.getUnqualifiedType(); 5064 } 5065 5066 if (getCanonicalType(retType) != LRetType) 5067 allLTypes = false; 5068 if (getCanonicalType(retType) != RRetType) 5069 allRTypes = false; 5070 5071 // FIXME: double check this 5072 // FIXME: should we error if lbase->getRegParmAttr() != 0 && 5073 // rbase->getRegParmAttr() != 0 && 5074 // lbase->getRegParmAttr() != rbase->getRegParmAttr()? 5075 FunctionType::ExtInfo lbaseInfo = lbase->getExtInfo(); 5076 FunctionType::ExtInfo rbaseInfo = rbase->getExtInfo(); 5077 5078 // Compatible functions must have compatible calling conventions 5079 if (!isSameCallConv(lbaseInfo.getCC(), rbaseInfo.getCC())) 5080 return QualType(); 5081 5082 // Regparm is part of the calling convention. 5083 if (lbaseInfo.getRegParm() != rbaseInfo.getRegParm()) 5084 return QualType(); 5085 5086 // It's noreturn if either type is. 5087 // FIXME: some uses, e.g. conditional exprs, really want this to be 'both'. 5088 bool NoReturn = lbaseInfo.getNoReturn() || rbaseInfo.getNoReturn(); 5089 if (NoReturn != lbaseInfo.getNoReturn()) 5090 allLTypes = false; 5091 if (NoReturn != rbaseInfo.getNoReturn()) 5092 allRTypes = false; 5093 5094 FunctionType::ExtInfo einfo(NoReturn, 5095 lbaseInfo.getRegParm(), 5096 lbaseInfo.getCC()); 5097 5098 if (lproto && rproto) { // two C99 style function prototypes 5099 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 5100 "C++ shouldn't be here"); 5101 unsigned lproto_nargs = lproto->getNumArgs(); 5102 unsigned rproto_nargs = rproto->getNumArgs(); 5103 5104 // Compatible functions must have the same number of arguments 5105 if (lproto_nargs != rproto_nargs) 5106 return QualType(); 5107 5108 // Variadic and non-variadic functions aren't compatible 5109 if (lproto->isVariadic() != rproto->isVariadic()) 5110 return QualType(); 5111 5112 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 5113 return QualType(); 5114 5115 // Check argument compatibility 5116 llvm::SmallVector<QualType, 10> types; 5117 for (unsigned i = 0; i < lproto_nargs; i++) { 5118 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 5119 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 5120 QualType argtype = mergeFunctionArgumentTypes(largtype, rargtype, 5121 OfBlockPointer, 5122 Unqualified); 5123 if (argtype.isNull()) return QualType(); 5124 5125 if (Unqualified) 5126 argtype = argtype.getUnqualifiedType(); 5127 5128 types.push_back(argtype); 5129 if (Unqualified) { 5130 largtype = largtype.getUnqualifiedType(); 5131 rargtype = rargtype.getUnqualifiedType(); 5132 } 5133 5134 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 5135 allLTypes = false; 5136 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 5137 allRTypes = false; 5138 } 5139 if (allLTypes) return lhs; 5140 if (allRTypes) return rhs; 5141 5142 FunctionProtoType::ExtProtoInfo EPI = lproto->getExtProtoInfo(); 5143 EPI.ExtInfo = einfo; 5144 return getFunctionType(retType, types.begin(), types.size(), EPI); 5145 } 5146 5147 if (lproto) allRTypes = false; 5148 if (rproto) allLTypes = false; 5149 5150 const FunctionProtoType *proto = lproto ? lproto : rproto; 5151 if (proto) { 5152 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 5153 if (proto->isVariadic()) return QualType(); 5154 // Check that the types are compatible with the types that 5155 // would result from default argument promotions (C99 6.7.5.3p15). 5156 // The only types actually affected are promotable integer 5157 // types and floats, which would be passed as a different 5158 // type depending on whether the prototype is visible. 5159 unsigned proto_nargs = proto->getNumArgs(); 5160 for (unsigned i = 0; i < proto_nargs; ++i) { 5161 QualType argTy = proto->getArgType(i); 5162 5163 // Look at the promotion type of enum types, since that is the type used 5164 // to pass enum values. 5165 if (const EnumType *Enum = argTy->getAs<EnumType>()) 5166 argTy = Enum->getDecl()->getPromotionType(); 5167 5168 if (argTy->isPromotableIntegerType() || 5169 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 5170 return QualType(); 5171 } 5172 5173 if (allLTypes) return lhs; 5174 if (allRTypes) return rhs; 5175 5176 FunctionProtoType::ExtProtoInfo EPI = proto->getExtProtoInfo(); 5177 EPI.ExtInfo = einfo; 5178 return getFunctionType(retType, proto->arg_type_begin(), 5179 proto->getNumArgs(), EPI); 5180 } 5181 5182 if (allLTypes) return lhs; 5183 if (allRTypes) return rhs; 5184 return getFunctionNoProtoType(retType, einfo); 5185} 5186 5187QualType ASTContext::mergeTypes(QualType LHS, QualType RHS, 5188 bool OfBlockPointer, 5189 bool Unqualified) { 5190 // C++ [expr]: If an expression initially has the type "reference to T", the 5191 // type is adjusted to "T" prior to any further analysis, the expression 5192 // designates the object or function denoted by the reference, and the 5193 // expression is an lvalue unless the reference is an rvalue reference and 5194 // the expression is a function call (possibly inside parentheses). 5195 assert(!LHS->getAs<ReferenceType>() && "LHS is a reference type?"); 5196 assert(!RHS->getAs<ReferenceType>() && "RHS is a reference type?"); 5197 5198 if (Unqualified) { 5199 LHS = LHS.getUnqualifiedType(); 5200 RHS = RHS.getUnqualifiedType(); 5201 } 5202 5203 QualType LHSCan = getCanonicalType(LHS), 5204 RHSCan = getCanonicalType(RHS); 5205 5206 // If two types are identical, they are compatible. 5207 if (LHSCan == RHSCan) 5208 return LHS; 5209 5210 // If the qualifiers are different, the types aren't compatible... mostly. 5211 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5212 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5213 if (LQuals != RQuals) { 5214 // If any of these qualifiers are different, we have a type 5215 // mismatch. 5216 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5217 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5218 return QualType(); 5219 5220 // Exactly one GC qualifier difference is allowed: __strong is 5221 // okay if the other type has no GC qualifier but is an Objective 5222 // C object pointer (i.e. implicitly strong by default). We fix 5223 // this by pretending that the unqualified type was actually 5224 // qualified __strong. 5225 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5226 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5227 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5228 5229 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5230 return QualType(); 5231 5232 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 5233 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 5234 } 5235 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 5236 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 5237 } 5238 return QualType(); 5239 } 5240 5241 // Okay, qualifiers are equal. 5242 5243 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 5244 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 5245 5246 // We want to consider the two function types to be the same for these 5247 // comparisons, just force one to the other. 5248 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 5249 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 5250 5251 // Same as above for arrays 5252 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 5253 LHSClass = Type::ConstantArray; 5254 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 5255 RHSClass = Type::ConstantArray; 5256 5257 // ObjCInterfaces are just specialized ObjCObjects. 5258 if (LHSClass == Type::ObjCInterface) LHSClass = Type::ObjCObject; 5259 if (RHSClass == Type::ObjCInterface) RHSClass = Type::ObjCObject; 5260 5261 // Canonicalize ExtVector -> Vector. 5262 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 5263 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 5264 5265 // If the canonical type classes don't match. 5266 if (LHSClass != RHSClass) { 5267 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 5268 // a signed integer type, or an unsigned integer type. 5269 // Compatibility is based on the underlying type, not the promotion 5270 // type. 5271 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 5272 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 5273 return RHS; 5274 } 5275 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 5276 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 5277 return LHS; 5278 } 5279 5280 return QualType(); 5281 } 5282 5283 // The canonical type classes match. 5284 switch (LHSClass) { 5285#define TYPE(Class, Base) 5286#define ABSTRACT_TYPE(Class, Base) 5287#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: 5288#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 5289#define DEPENDENT_TYPE(Class, Base) case Type::Class: 5290#include "clang/AST/TypeNodes.def" 5291 assert(false && "Non-canonical and dependent types shouldn't get here"); 5292 return QualType(); 5293 5294 case Type::LValueReference: 5295 case Type::RValueReference: 5296 case Type::MemberPointer: 5297 assert(false && "C++ should never be in mergeTypes"); 5298 return QualType(); 5299 5300 case Type::ObjCInterface: 5301 case Type::IncompleteArray: 5302 case Type::VariableArray: 5303 case Type::FunctionProto: 5304 case Type::ExtVector: 5305 assert(false && "Types are eliminated above"); 5306 return QualType(); 5307 5308 case Type::Pointer: 5309 { 5310 // Merge two pointer types, while trying to preserve typedef info 5311 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 5312 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 5313 if (Unqualified) { 5314 LHSPointee = LHSPointee.getUnqualifiedType(); 5315 RHSPointee = RHSPointee.getUnqualifiedType(); 5316 } 5317 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, false, 5318 Unqualified); 5319 if (ResultType.isNull()) return QualType(); 5320 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5321 return LHS; 5322 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5323 return RHS; 5324 return getPointerType(ResultType); 5325 } 5326 case Type::BlockPointer: 5327 { 5328 // Merge two block pointer types, while trying to preserve typedef info 5329 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 5330 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 5331 if (Unqualified) { 5332 LHSPointee = LHSPointee.getUnqualifiedType(); 5333 RHSPointee = RHSPointee.getUnqualifiedType(); 5334 } 5335 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, OfBlockPointer, 5336 Unqualified); 5337 if (ResultType.isNull()) return QualType(); 5338 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5339 return LHS; 5340 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5341 return RHS; 5342 return getBlockPointerType(ResultType); 5343 } 5344 case Type::ConstantArray: 5345 { 5346 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 5347 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 5348 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 5349 return QualType(); 5350 5351 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 5352 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 5353 if (Unqualified) { 5354 LHSElem = LHSElem.getUnqualifiedType(); 5355 RHSElem = RHSElem.getUnqualifiedType(); 5356 } 5357 5358 QualType ResultType = mergeTypes(LHSElem, RHSElem, false, Unqualified); 5359 if (ResultType.isNull()) return QualType(); 5360 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5361 return LHS; 5362 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5363 return RHS; 5364 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 5365 ArrayType::ArraySizeModifier(), 0); 5366 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 5367 ArrayType::ArraySizeModifier(), 0); 5368 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 5369 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 5370 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5371 return LHS; 5372 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5373 return RHS; 5374 if (LVAT) { 5375 // FIXME: This isn't correct! But tricky to implement because 5376 // the array's size has to be the size of LHS, but the type 5377 // has to be different. 5378 return LHS; 5379 } 5380 if (RVAT) { 5381 // FIXME: This isn't correct! But tricky to implement because 5382 // the array's size has to be the size of RHS, but the type 5383 // has to be different. 5384 return RHS; 5385 } 5386 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 5387 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 5388 return getIncompleteArrayType(ResultType, 5389 ArrayType::ArraySizeModifier(), 0); 5390 } 5391 case Type::FunctionNoProto: 5392 return mergeFunctionTypes(LHS, RHS, OfBlockPointer, Unqualified); 5393 case Type::Record: 5394 case Type::Enum: 5395 return QualType(); 5396 case Type::Builtin: 5397 // Only exactly equal builtin types are compatible, which is tested above. 5398 return QualType(); 5399 case Type::Complex: 5400 // Distinct complex types are incompatible. 5401 return QualType(); 5402 case Type::Vector: 5403 // FIXME: The merged type should be an ExtVector! 5404 if (areCompatVectorTypes(LHSCan->getAs<VectorType>(), 5405 RHSCan->getAs<VectorType>())) 5406 return LHS; 5407 return QualType(); 5408 case Type::ObjCObject: { 5409 // Check if the types are assignment compatible. 5410 // FIXME: This should be type compatibility, e.g. whether 5411 // "LHS x; RHS x;" at global scope is legal. 5412 const ObjCObjectType* LHSIface = LHS->getAs<ObjCObjectType>(); 5413 const ObjCObjectType* RHSIface = RHS->getAs<ObjCObjectType>(); 5414 if (canAssignObjCInterfaces(LHSIface, RHSIface)) 5415 return LHS; 5416 5417 return QualType(); 5418 } 5419 case Type::ObjCObjectPointer: { 5420 if (OfBlockPointer) { 5421 if (canAssignObjCInterfacesInBlockPointer( 5422 LHS->getAs<ObjCObjectPointerType>(), 5423 RHS->getAs<ObjCObjectPointerType>())) 5424 return LHS; 5425 return QualType(); 5426 } 5427 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 5428 RHS->getAs<ObjCObjectPointerType>())) 5429 return LHS; 5430 5431 return QualType(); 5432 } 5433 } 5434 5435 return QualType(); 5436} 5437 5438/// mergeObjCGCQualifiers - This routine merges ObjC's GC attribute of 'LHS' and 5439/// 'RHS' attributes and returns the merged version; including for function 5440/// return types. 5441QualType ASTContext::mergeObjCGCQualifiers(QualType LHS, QualType RHS) { 5442 QualType LHSCan = getCanonicalType(LHS), 5443 RHSCan = getCanonicalType(RHS); 5444 // If two types are identical, they are compatible. 5445 if (LHSCan == RHSCan) 5446 return LHS; 5447 if (RHSCan->isFunctionType()) { 5448 if (!LHSCan->isFunctionType()) 5449 return QualType(); 5450 QualType OldReturnType = 5451 cast<FunctionType>(RHSCan.getTypePtr())->getResultType(); 5452 QualType NewReturnType = 5453 cast<FunctionType>(LHSCan.getTypePtr())->getResultType(); 5454 QualType ResReturnType = 5455 mergeObjCGCQualifiers(NewReturnType, OldReturnType); 5456 if (ResReturnType.isNull()) 5457 return QualType(); 5458 if (ResReturnType == NewReturnType || ResReturnType == OldReturnType) { 5459 // id foo(); ... __strong id foo(); or: __strong id foo(); ... id foo(); 5460 // In either case, use OldReturnType to build the new function type. 5461 const FunctionType *F = LHS->getAs<FunctionType>(); 5462 if (const FunctionProtoType *FPT = cast<FunctionProtoType>(F)) { 5463 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5464 EPI.ExtInfo = getFunctionExtInfo(LHS); 5465 QualType ResultType 5466 = getFunctionType(OldReturnType, FPT->arg_type_begin(), 5467 FPT->getNumArgs(), EPI); 5468 return ResultType; 5469 } 5470 } 5471 return QualType(); 5472 } 5473 5474 // If the qualifiers are different, the types can still be merged. 5475 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5476 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5477 if (LQuals != RQuals) { 5478 // If any of these qualifiers are different, we have a type mismatch. 5479 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5480 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5481 return QualType(); 5482 5483 // Exactly one GC qualifier difference is allowed: __strong is 5484 // okay if the other type has no GC qualifier but is an Objective 5485 // C object pointer (i.e. implicitly strong by default). We fix 5486 // this by pretending that the unqualified type was actually 5487 // qualified __strong. 5488 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5489 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5490 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5491 5492 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5493 return QualType(); 5494 5495 if (GC_L == Qualifiers::Strong) 5496 return LHS; 5497 if (GC_R == Qualifiers::Strong) 5498 return RHS; 5499 return QualType(); 5500 } 5501 5502 if (LHSCan->isObjCObjectPointerType() && RHSCan->isObjCObjectPointerType()) { 5503 QualType LHSBaseQT = LHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5504 QualType RHSBaseQT = RHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5505 QualType ResQT = mergeObjCGCQualifiers(LHSBaseQT, RHSBaseQT); 5506 if (ResQT == LHSBaseQT) 5507 return LHS; 5508 if (ResQT == RHSBaseQT) 5509 return RHS; 5510 } 5511 return QualType(); 5512} 5513 5514//===----------------------------------------------------------------------===// 5515// Integer Predicates 5516//===----------------------------------------------------------------------===// 5517 5518unsigned ASTContext::getIntWidth(QualType T) const { 5519 if (const EnumType *ET = dyn_cast<EnumType>(T)) 5520 T = ET->getDecl()->getIntegerType(); 5521 if (T->isBooleanType()) 5522 return 1; 5523 // For builtin types, just use the standard type sizing method 5524 return (unsigned)getTypeSize(T); 5525} 5526 5527QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 5528 assert(T->hasSignedIntegerRepresentation() && "Unexpected type"); 5529 5530 // Turn <4 x signed int> -> <4 x unsigned int> 5531 if (const VectorType *VTy = T->getAs<VectorType>()) 5532 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 5533 VTy->getNumElements(), VTy->getVectorKind()); 5534 5535 // For enums, we return the unsigned version of the base type. 5536 if (const EnumType *ETy = T->getAs<EnumType>()) 5537 T = ETy->getDecl()->getIntegerType(); 5538 5539 const BuiltinType *BTy = T->getAs<BuiltinType>(); 5540 assert(BTy && "Unexpected signed integer type"); 5541 switch (BTy->getKind()) { 5542 case BuiltinType::Char_S: 5543 case BuiltinType::SChar: 5544 return UnsignedCharTy; 5545 case BuiltinType::Short: 5546 return UnsignedShortTy; 5547 case BuiltinType::Int: 5548 return UnsignedIntTy; 5549 case BuiltinType::Long: 5550 return UnsignedLongTy; 5551 case BuiltinType::LongLong: 5552 return UnsignedLongLongTy; 5553 case BuiltinType::Int128: 5554 return UnsignedInt128Ty; 5555 default: 5556 assert(0 && "Unexpected signed integer type"); 5557 return QualType(); 5558 } 5559} 5560 5561ExternalASTSource::~ExternalASTSource() { } 5562 5563void ExternalASTSource::PrintStats() { } 5564 5565ASTMutationListener::~ASTMutationListener() { } 5566 5567 5568//===----------------------------------------------------------------------===// 5569// Builtin Type Computation 5570//===----------------------------------------------------------------------===// 5571 5572/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 5573/// pointer over the consumed characters. This returns the resultant type. If 5574/// AllowTypeModifiers is false then modifier like * are not parsed, just basic 5575/// types. This allows "v2i*" to be parsed as a pointer to a v2i instead of 5576/// a vector of "i*". 5577/// 5578/// RequiresICE is filled in on return to indicate whether the value is required 5579/// to be an Integer Constant Expression. 5580static QualType DecodeTypeFromStr(const char *&Str, const ASTContext &Context, 5581 ASTContext::GetBuiltinTypeError &Error, 5582 bool &RequiresICE, 5583 bool AllowTypeModifiers) { 5584 // Modifiers. 5585 int HowLong = 0; 5586 bool Signed = false, Unsigned = false; 5587 RequiresICE = false; 5588 5589 // Read the prefixed modifiers first. 5590 bool Done = false; 5591 while (!Done) { 5592 switch (*Str++) { 5593 default: Done = true; --Str; break; 5594 case 'I': 5595 RequiresICE = true; 5596 break; 5597 case 'S': 5598 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 5599 assert(!Signed && "Can't use 'S' modifier multiple times!"); 5600 Signed = true; 5601 break; 5602 case 'U': 5603 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 5604 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 5605 Unsigned = true; 5606 break; 5607 case 'L': 5608 assert(HowLong <= 2 && "Can't have LLLL modifier"); 5609 ++HowLong; 5610 break; 5611 } 5612 } 5613 5614 QualType Type; 5615 5616 // Read the base type. 5617 switch (*Str++) { 5618 default: assert(0 && "Unknown builtin type letter!"); 5619 case 'v': 5620 assert(HowLong == 0 && !Signed && !Unsigned && 5621 "Bad modifiers used with 'v'!"); 5622 Type = Context.VoidTy; 5623 break; 5624 case 'f': 5625 assert(HowLong == 0 && !Signed && !Unsigned && 5626 "Bad modifiers used with 'f'!"); 5627 Type = Context.FloatTy; 5628 break; 5629 case 'd': 5630 assert(HowLong < 2 && !Signed && !Unsigned && 5631 "Bad modifiers used with 'd'!"); 5632 if (HowLong) 5633 Type = Context.LongDoubleTy; 5634 else 5635 Type = Context.DoubleTy; 5636 break; 5637 case 's': 5638 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 5639 if (Unsigned) 5640 Type = Context.UnsignedShortTy; 5641 else 5642 Type = Context.ShortTy; 5643 break; 5644 case 'i': 5645 if (HowLong == 3) 5646 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 5647 else if (HowLong == 2) 5648 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 5649 else if (HowLong == 1) 5650 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 5651 else 5652 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 5653 break; 5654 case 'c': 5655 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 5656 if (Signed) 5657 Type = Context.SignedCharTy; 5658 else if (Unsigned) 5659 Type = Context.UnsignedCharTy; 5660 else 5661 Type = Context.CharTy; 5662 break; 5663 case 'b': // boolean 5664 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 5665 Type = Context.BoolTy; 5666 break; 5667 case 'z': // size_t. 5668 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 5669 Type = Context.getSizeType(); 5670 break; 5671 case 'F': 5672 Type = Context.getCFConstantStringType(); 5673 break; 5674 case 'G': 5675 Type = Context.getObjCIdType(); 5676 break; 5677 case 'H': 5678 Type = Context.getObjCSelType(); 5679 break; 5680 case 'a': 5681 Type = Context.getBuiltinVaListType(); 5682 assert(!Type.isNull() && "builtin va list type not initialized!"); 5683 break; 5684 case 'A': 5685 // This is a "reference" to a va_list; however, what exactly 5686 // this means depends on how va_list is defined. There are two 5687 // different kinds of va_list: ones passed by value, and ones 5688 // passed by reference. An example of a by-value va_list is 5689 // x86, where va_list is a char*. An example of by-ref va_list 5690 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 5691 // we want this argument to be a char*&; for x86-64, we want 5692 // it to be a __va_list_tag*. 5693 Type = Context.getBuiltinVaListType(); 5694 assert(!Type.isNull() && "builtin va list type not initialized!"); 5695 if (Type->isArrayType()) 5696 Type = Context.getArrayDecayedType(Type); 5697 else 5698 Type = Context.getLValueReferenceType(Type); 5699 break; 5700 case 'V': { 5701 char *End; 5702 unsigned NumElements = strtoul(Str, &End, 10); 5703 assert(End != Str && "Missing vector size"); 5704 Str = End; 5705 5706 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, 5707 RequiresICE, false); 5708 assert(!RequiresICE && "Can't require vector ICE"); 5709 5710 // TODO: No way to make AltiVec vectors in builtins yet. 5711 Type = Context.getVectorType(ElementType, NumElements, 5712 VectorType::GenericVector); 5713 break; 5714 } 5715 case 'X': { 5716 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, RequiresICE, 5717 false); 5718 assert(!RequiresICE && "Can't require complex ICE"); 5719 Type = Context.getComplexType(ElementType); 5720 break; 5721 } 5722 case 'P': 5723 Type = Context.getFILEType(); 5724 if (Type.isNull()) { 5725 Error = ASTContext::GE_Missing_stdio; 5726 return QualType(); 5727 } 5728 break; 5729 case 'J': 5730 if (Signed) 5731 Type = Context.getsigjmp_bufType(); 5732 else 5733 Type = Context.getjmp_bufType(); 5734 5735 if (Type.isNull()) { 5736 Error = ASTContext::GE_Missing_setjmp; 5737 return QualType(); 5738 } 5739 break; 5740 } 5741 5742 // If there are modifiers and if we're allowed to parse them, go for it. 5743 Done = !AllowTypeModifiers; 5744 while (!Done) { 5745 switch (char c = *Str++) { 5746 default: Done = true; --Str; break; 5747 case '*': 5748 case '&': { 5749 // Both pointers and references can have their pointee types 5750 // qualified with an address space. 5751 char *End; 5752 unsigned AddrSpace = strtoul(Str, &End, 10); 5753 if (End != Str && AddrSpace != 0) { 5754 Type = Context.getAddrSpaceQualType(Type, AddrSpace); 5755 Str = End; 5756 } 5757 if (c == '*') 5758 Type = Context.getPointerType(Type); 5759 else 5760 Type = Context.getLValueReferenceType(Type); 5761 break; 5762 } 5763 // FIXME: There's no way to have a built-in with an rvalue ref arg. 5764 case 'C': 5765 Type = Type.withConst(); 5766 break; 5767 case 'D': 5768 Type = Context.getVolatileType(Type); 5769 break; 5770 } 5771 } 5772 5773 assert((!RequiresICE || Type->isIntegralOrEnumerationType()) && 5774 "Integer constant 'I' type must be an integer"); 5775 5776 return Type; 5777} 5778 5779/// GetBuiltinType - Return the type for the specified builtin. 5780QualType ASTContext::GetBuiltinType(unsigned Id, 5781 GetBuiltinTypeError &Error, 5782 unsigned *IntegerConstantArgs) const { 5783 const char *TypeStr = BuiltinInfo.GetTypeString(Id); 5784 5785 llvm::SmallVector<QualType, 8> ArgTypes; 5786 5787 bool RequiresICE = false; 5788 Error = GE_None; 5789 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error, 5790 RequiresICE, true); 5791 if (Error != GE_None) 5792 return QualType(); 5793 5794 assert(!RequiresICE && "Result of intrinsic cannot be required to be an ICE"); 5795 5796 while (TypeStr[0] && TypeStr[0] != '.') { 5797 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error, RequiresICE, true); 5798 if (Error != GE_None) 5799 return QualType(); 5800 5801 // If this argument is required to be an IntegerConstantExpression and the 5802 // caller cares, fill in the bitmask we return. 5803 if (RequiresICE && IntegerConstantArgs) 5804 *IntegerConstantArgs |= 1 << ArgTypes.size(); 5805 5806 // Do array -> pointer decay. The builtin should use the decayed type. 5807 if (Ty->isArrayType()) 5808 Ty = getArrayDecayedType(Ty); 5809 5810 ArgTypes.push_back(Ty); 5811 } 5812 5813 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 5814 "'.' should only occur at end of builtin type list!"); 5815 5816 FunctionType::ExtInfo EI; 5817 if (BuiltinInfo.isNoReturn(Id)) EI = EI.withNoReturn(true); 5818 5819 bool Variadic = (TypeStr[0] == '.'); 5820 5821 // We really shouldn't be making a no-proto type here, especially in C++. 5822 if (ArgTypes.empty() && Variadic) 5823 return getFunctionNoProtoType(ResType, EI); 5824 5825 FunctionProtoType::ExtProtoInfo EPI; 5826 EPI.ExtInfo = EI; 5827 EPI.Variadic = Variadic; 5828 5829 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), EPI); 5830} 5831 5832GVALinkage ASTContext::GetGVALinkageForFunction(const FunctionDecl *FD) { 5833 GVALinkage External = GVA_StrongExternal; 5834 5835 Linkage L = FD->getLinkage(); 5836 if (L == ExternalLinkage && getLangOptions().CPlusPlus && 5837 FD->getType()->getLinkage() == UniqueExternalLinkage) 5838 L = UniqueExternalLinkage; 5839 5840 switch (L) { 5841 case NoLinkage: 5842 case InternalLinkage: 5843 case UniqueExternalLinkage: 5844 return GVA_Internal; 5845 5846 case ExternalLinkage: 5847 switch (FD->getTemplateSpecializationKind()) { 5848 case TSK_Undeclared: 5849 case TSK_ExplicitSpecialization: 5850 External = GVA_StrongExternal; 5851 break; 5852 5853 case TSK_ExplicitInstantiationDefinition: 5854 return GVA_ExplicitTemplateInstantiation; 5855 5856 case TSK_ExplicitInstantiationDeclaration: 5857 case TSK_ImplicitInstantiation: 5858 External = GVA_TemplateInstantiation; 5859 break; 5860 } 5861 } 5862 5863 if (!FD->isInlined()) 5864 return External; 5865 5866 if (!getLangOptions().CPlusPlus || FD->hasAttr<GNUInlineAttr>()) { 5867 // GNU or C99 inline semantics. Determine whether this symbol should be 5868 // externally visible. 5869 if (FD->isInlineDefinitionExternallyVisible()) 5870 return External; 5871 5872 // C99 inline semantics, where the symbol is not externally visible. 5873 return GVA_C99Inline; 5874 } 5875 5876 // C++0x [temp.explicit]p9: 5877 // [ Note: The intent is that an inline function that is the subject of 5878 // an explicit instantiation declaration will still be implicitly 5879 // instantiated when used so that the body can be considered for 5880 // inlining, but that no out-of-line copy of the inline function would be 5881 // generated in the translation unit. -- end note ] 5882 if (FD->getTemplateSpecializationKind() 5883 == TSK_ExplicitInstantiationDeclaration) 5884 return GVA_C99Inline; 5885 5886 return GVA_CXXInline; 5887} 5888 5889GVALinkage ASTContext::GetGVALinkageForVariable(const VarDecl *VD) { 5890 // If this is a static data member, compute the kind of template 5891 // specialization. Otherwise, this variable is not part of a 5892 // template. 5893 TemplateSpecializationKind TSK = TSK_Undeclared; 5894 if (VD->isStaticDataMember()) 5895 TSK = VD->getTemplateSpecializationKind(); 5896 5897 Linkage L = VD->getLinkage(); 5898 if (L == ExternalLinkage && getLangOptions().CPlusPlus && 5899 VD->getType()->getLinkage() == UniqueExternalLinkage) 5900 L = UniqueExternalLinkage; 5901 5902 switch (L) { 5903 case NoLinkage: 5904 case InternalLinkage: 5905 case UniqueExternalLinkage: 5906 return GVA_Internal; 5907 5908 case ExternalLinkage: 5909 switch (TSK) { 5910 case TSK_Undeclared: 5911 case TSK_ExplicitSpecialization: 5912 return GVA_StrongExternal; 5913 5914 case TSK_ExplicitInstantiationDeclaration: 5915 llvm_unreachable("Variable should not be instantiated"); 5916 // Fall through to treat this like any other instantiation. 5917 5918 case TSK_ExplicitInstantiationDefinition: 5919 return GVA_ExplicitTemplateInstantiation; 5920 5921 case TSK_ImplicitInstantiation: 5922 return GVA_TemplateInstantiation; 5923 } 5924 } 5925 5926 return GVA_StrongExternal; 5927} 5928 5929bool ASTContext::DeclMustBeEmitted(const Decl *D) { 5930 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 5931 if (!VD->isFileVarDecl()) 5932 return false; 5933 } else if (!isa<FunctionDecl>(D)) 5934 return false; 5935 5936 // Weak references don't produce any output by themselves. 5937 if (D->hasAttr<WeakRefAttr>()) 5938 return false; 5939 5940 // Aliases and used decls are required. 5941 if (D->hasAttr<AliasAttr>() || D->hasAttr<UsedAttr>()) 5942 return true; 5943 5944 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 5945 // Forward declarations aren't required. 5946 if (!FD->isThisDeclarationADefinition()) 5947 return false; 5948 5949 // Constructors and destructors are required. 5950 if (FD->hasAttr<ConstructorAttr>() || FD->hasAttr<DestructorAttr>()) 5951 return true; 5952 5953 // The key function for a class is required. 5954 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 5955 const CXXRecordDecl *RD = MD->getParent(); 5956 if (MD->isOutOfLine() && RD->isDynamicClass()) { 5957 const CXXMethodDecl *KeyFunc = getKeyFunction(RD); 5958 if (KeyFunc && KeyFunc->getCanonicalDecl() == MD->getCanonicalDecl()) 5959 return true; 5960 } 5961 } 5962 5963 GVALinkage Linkage = GetGVALinkageForFunction(FD); 5964 5965 // static, static inline, always_inline, and extern inline functions can 5966 // always be deferred. Normal inline functions can be deferred in C99/C++. 5967 // Implicit template instantiations can also be deferred in C++. 5968 if (Linkage == GVA_Internal || Linkage == GVA_C99Inline || 5969 Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) 5970 return false; 5971 return true; 5972 } 5973 5974 const VarDecl *VD = cast<VarDecl>(D); 5975 assert(VD->isFileVarDecl() && "Expected file scoped var"); 5976 5977 if (VD->isThisDeclarationADefinition() == VarDecl::DeclarationOnly) 5978 return false; 5979 5980 // Structs that have non-trivial constructors or destructors are required. 5981 5982 // FIXME: Handle references. 5983 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 5984 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 5985 if (RD->hasDefinition() && 5986 (!RD->hasTrivialConstructor() || !RD->hasTrivialDestructor())) 5987 return true; 5988 } 5989 } 5990 5991 GVALinkage L = GetGVALinkageForVariable(VD); 5992 if (L == GVA_Internal || L == GVA_TemplateInstantiation) { 5993 if (!(VD->getInit() && VD->getInit()->HasSideEffects(*this))) 5994 return false; 5995 } 5996 5997 return true; 5998} 5999 6000CallingConv ASTContext::getDefaultMethodCallConv() { 6001 // Pass through to the C++ ABI object 6002 return ABI->getDefaultMethodCallConv(); 6003} 6004 6005bool ASTContext::isNearlyEmpty(const CXXRecordDecl *RD) const { 6006 // Pass through to the C++ ABI object 6007 return ABI->isNearlyEmpty(RD); 6008} 6009 6010MangleContext *ASTContext::createMangleContext() { 6011 switch (Target.getCXXABI()) { 6012 case CXXABI_ARM: 6013 case CXXABI_Itanium: 6014 return createItaniumMangleContext(*this, getDiagnostics()); 6015 case CXXABI_Microsoft: 6016 return createMicrosoftMangleContext(*this, getDiagnostics()); 6017 } 6018 assert(0 && "Unsupported ABI"); 6019 return 0; 6020} 6021 6022CXXABI::~CXXABI() {} 6023