ASTContext.cpp revision 14aba76042e041b2c5e439bf4ae353a0a3c7fd73
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 cudaConfigureCallDecl(0), 201 NullTypeSourceInfo(QualType()), 202 SourceMgr(SM), LangOpts(LOpts), ABI(createCXXABI(t)), Target(t), 203 Idents(idents), Selectors(sels), 204 BuiltinInfo(builtins), 205 DeclarationNames(*this), 206 ExternalSource(0), Listener(0), PrintingPolicy(LOpts), 207 LastSDM(0, 0), 208 UniqueBlockByRefTypeID(0) { 209 ObjCIdRedefinitionType = QualType(); 210 ObjCClassRedefinitionType = QualType(); 211 ObjCSelRedefinitionType = QualType(); 212 if (size_reserve > 0) Types.reserve(size_reserve); 213 TUDecl = TranslationUnitDecl::Create(*this); 214 InitBuiltinTypes(); 215} 216 217ASTContext::~ASTContext() { 218 // Release the DenseMaps associated with DeclContext objects. 219 // FIXME: Is this the ideal solution? 220 ReleaseDeclContextMaps(); 221 222 // Call all of the deallocation functions. 223 for (unsigned I = 0, N = Deallocations.size(); I != N; ++I) 224 Deallocations[I].first(Deallocations[I].second); 225 226 // Release all of the memory associated with overridden C++ methods. 227 for (llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::iterator 228 OM = OverriddenMethods.begin(), OMEnd = OverriddenMethods.end(); 229 OM != OMEnd; ++OM) 230 OM->second.Destroy(); 231 232 // ASTRecordLayout objects in ASTRecordLayouts must always be destroyed 233 // because they can contain DenseMaps. 234 for (llvm::DenseMap<const ObjCContainerDecl*, 235 const ASTRecordLayout*>::iterator 236 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); I != E; ) 237 // Increment in loop to prevent using deallocated memory. 238 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 239 R->Destroy(*this); 240 241 for (llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 242 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); I != E; ) { 243 // Increment in loop to prevent using deallocated memory. 244 if (ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second)) 245 R->Destroy(*this); 246 } 247 248 for (llvm::DenseMap<const Decl*, AttrVec*>::iterator A = DeclAttrs.begin(), 249 AEnd = DeclAttrs.end(); 250 A != AEnd; ++A) 251 A->second->~AttrVec(); 252} 253 254void ASTContext::AddDeallocation(void (*Callback)(void*), void *Data) { 255 Deallocations.push_back(std::make_pair(Callback, Data)); 256} 257 258void 259ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 260 ExternalSource.reset(Source.take()); 261} 262 263void ASTContext::PrintStats() const { 264 fprintf(stderr, "*** AST Context Stats:\n"); 265 fprintf(stderr, " %d types total.\n", (int)Types.size()); 266 267 unsigned counts[] = { 268#define TYPE(Name, Parent) 0, 269#define ABSTRACT_TYPE(Name, Parent) 270#include "clang/AST/TypeNodes.def" 271 0 // Extra 272 }; 273 274 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 275 Type *T = Types[i]; 276 counts[(unsigned)T->getTypeClass()]++; 277 } 278 279 unsigned Idx = 0; 280 unsigned TotalBytes = 0; 281#define TYPE(Name, Parent) \ 282 if (counts[Idx]) \ 283 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 284 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 285 ++Idx; 286#define ABSTRACT_TYPE(Name, Parent) 287#include "clang/AST/TypeNodes.def" 288 289 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 290 291 // Implicit special member functions. 292 fprintf(stderr, " %u/%u implicit default constructors created\n", 293 NumImplicitDefaultConstructorsDeclared, 294 NumImplicitDefaultConstructors); 295 fprintf(stderr, " %u/%u implicit copy constructors created\n", 296 NumImplicitCopyConstructorsDeclared, 297 NumImplicitCopyConstructors); 298 fprintf(stderr, " %u/%u implicit copy assignment operators created\n", 299 NumImplicitCopyAssignmentOperatorsDeclared, 300 NumImplicitCopyAssignmentOperators); 301 fprintf(stderr, " %u/%u implicit destructors created\n", 302 NumImplicitDestructorsDeclared, NumImplicitDestructors); 303 304 if (ExternalSource.get()) { 305 fprintf(stderr, "\n"); 306 ExternalSource->PrintStats(); 307 } 308 309 BumpAlloc.PrintStats(); 310} 311 312 313void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) { 314 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 315 R = CanQualType::CreateUnsafe(QualType(Ty, 0)); 316 Types.push_back(Ty); 317} 318 319void ASTContext::InitBuiltinTypes() { 320 assert(VoidTy.isNull() && "Context reinitialized?"); 321 322 // C99 6.2.5p19. 323 InitBuiltinType(VoidTy, BuiltinType::Void); 324 325 // C99 6.2.5p2. 326 InitBuiltinType(BoolTy, BuiltinType::Bool); 327 // C99 6.2.5p3. 328 if (LangOpts.CharIsSigned) 329 InitBuiltinType(CharTy, BuiltinType::Char_S); 330 else 331 InitBuiltinType(CharTy, BuiltinType::Char_U); 332 // C99 6.2.5p4. 333 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 334 InitBuiltinType(ShortTy, BuiltinType::Short); 335 InitBuiltinType(IntTy, BuiltinType::Int); 336 InitBuiltinType(LongTy, BuiltinType::Long); 337 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 338 339 // C99 6.2.5p6. 340 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 341 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 342 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 343 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 344 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 345 346 // C99 6.2.5p10. 347 InitBuiltinType(FloatTy, BuiltinType::Float); 348 InitBuiltinType(DoubleTy, BuiltinType::Double); 349 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 350 351 // GNU extension, 128-bit integers. 352 InitBuiltinType(Int128Ty, BuiltinType::Int128); 353 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 354 355 if (LangOpts.CPlusPlus) { // C++ 3.9.1p5 356 if (!LangOpts.ShortWChar) 357 InitBuiltinType(WCharTy, BuiltinType::WChar_S); 358 else // -fshort-wchar makes wchar_t be unsigned. 359 InitBuiltinType(WCharTy, BuiltinType::WChar_U); 360 } else // C99 361 WCharTy = getFromTargetType(Target.getWCharType()); 362 363 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 364 InitBuiltinType(Char16Ty, BuiltinType::Char16); 365 else // C99 366 Char16Ty = getFromTargetType(Target.getChar16Type()); 367 368 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 369 InitBuiltinType(Char32Ty, BuiltinType::Char32); 370 else // C99 371 Char32Ty = getFromTargetType(Target.getChar32Type()); 372 373 // Placeholder type for type-dependent expressions whose type is 374 // completely unknown. No code should ever check a type against 375 // DependentTy and users should never see it; however, it is here to 376 // help diagnose failures to properly check for type-dependent 377 // expressions. 378 InitBuiltinType(DependentTy, BuiltinType::Dependent); 379 380 // Placeholder type for functions. 381 InitBuiltinType(OverloadTy, BuiltinType::Overload); 382 383 // C99 6.2.5p11. 384 FloatComplexTy = getComplexType(FloatTy); 385 DoubleComplexTy = getComplexType(DoubleTy); 386 LongDoubleComplexTy = getComplexType(LongDoubleTy); 387 388 BuiltinVaListType = QualType(); 389 390 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 391 ObjCIdTypedefType = QualType(); 392 ObjCClassTypedefType = QualType(); 393 ObjCSelTypedefType = QualType(); 394 395 // Builtin types for 'id', 'Class', and 'SEL'. 396 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 397 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 398 InitBuiltinType(ObjCBuiltinSelTy, BuiltinType::ObjCSel); 399 400 ObjCConstantStringType = QualType(); 401 402 // void * type 403 VoidPtrTy = getPointerType(VoidTy); 404 405 // nullptr type (C++0x 2.14.7) 406 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 407} 408 409Diagnostic &ASTContext::getDiagnostics() const { 410 return SourceMgr.getDiagnostics(); 411} 412 413AttrVec& ASTContext::getDeclAttrs(const Decl *D) { 414 AttrVec *&Result = DeclAttrs[D]; 415 if (!Result) { 416 void *Mem = Allocate(sizeof(AttrVec)); 417 Result = new (Mem) AttrVec; 418 } 419 420 return *Result; 421} 422 423/// \brief Erase the attributes corresponding to the given declaration. 424void ASTContext::eraseDeclAttrs(const Decl *D) { 425 llvm::DenseMap<const Decl*, AttrVec*>::iterator Pos = DeclAttrs.find(D); 426 if (Pos != DeclAttrs.end()) { 427 Pos->second->~AttrVec(); 428 DeclAttrs.erase(Pos); 429 } 430} 431 432 433MemberSpecializationInfo * 434ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 435 assert(Var->isStaticDataMember() && "Not a static data member"); 436 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 437 = InstantiatedFromStaticDataMember.find(Var); 438 if (Pos == InstantiatedFromStaticDataMember.end()) 439 return 0; 440 441 return Pos->second; 442} 443 444void 445ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 446 TemplateSpecializationKind TSK, 447 SourceLocation PointOfInstantiation) { 448 assert(Inst->isStaticDataMember() && "Not a static data member"); 449 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 450 assert(!InstantiatedFromStaticDataMember[Inst] && 451 "Already noted what static data member was instantiated from"); 452 InstantiatedFromStaticDataMember[Inst] 453 = new (*this) MemberSpecializationInfo(Tmpl, TSK, PointOfInstantiation); 454} 455 456NamedDecl * 457ASTContext::getInstantiatedFromUsingDecl(UsingDecl *UUD) { 458 llvm::DenseMap<UsingDecl *, NamedDecl *>::const_iterator Pos 459 = InstantiatedFromUsingDecl.find(UUD); 460 if (Pos == InstantiatedFromUsingDecl.end()) 461 return 0; 462 463 return Pos->second; 464} 465 466void 467ASTContext::setInstantiatedFromUsingDecl(UsingDecl *Inst, NamedDecl *Pattern) { 468 assert((isa<UsingDecl>(Pattern) || 469 isa<UnresolvedUsingValueDecl>(Pattern) || 470 isa<UnresolvedUsingTypenameDecl>(Pattern)) && 471 "pattern decl is not a using decl"); 472 assert(!InstantiatedFromUsingDecl[Inst] && "pattern already exists"); 473 InstantiatedFromUsingDecl[Inst] = Pattern; 474} 475 476UsingShadowDecl * 477ASTContext::getInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst) { 478 llvm::DenseMap<UsingShadowDecl*, UsingShadowDecl*>::const_iterator Pos 479 = InstantiatedFromUsingShadowDecl.find(Inst); 480 if (Pos == InstantiatedFromUsingShadowDecl.end()) 481 return 0; 482 483 return Pos->second; 484} 485 486void 487ASTContext::setInstantiatedFromUsingShadowDecl(UsingShadowDecl *Inst, 488 UsingShadowDecl *Pattern) { 489 assert(!InstantiatedFromUsingShadowDecl[Inst] && "pattern already exists"); 490 InstantiatedFromUsingShadowDecl[Inst] = Pattern; 491} 492 493FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 494 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 495 = InstantiatedFromUnnamedFieldDecl.find(Field); 496 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 497 return 0; 498 499 return Pos->second; 500} 501 502void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 503 FieldDecl *Tmpl) { 504 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 505 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 506 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 507 "Already noted what unnamed field was instantiated from"); 508 509 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 510} 511 512ASTContext::overridden_cxx_method_iterator 513ASTContext::overridden_methods_begin(const CXXMethodDecl *Method) const { 514 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 515 = OverriddenMethods.find(Method); 516 if (Pos == OverriddenMethods.end()) 517 return 0; 518 519 return Pos->second.begin(); 520} 521 522ASTContext::overridden_cxx_method_iterator 523ASTContext::overridden_methods_end(const CXXMethodDecl *Method) const { 524 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 525 = OverriddenMethods.find(Method); 526 if (Pos == OverriddenMethods.end()) 527 return 0; 528 529 return Pos->second.end(); 530} 531 532unsigned 533ASTContext::overridden_methods_size(const CXXMethodDecl *Method) const { 534 llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos 535 = OverriddenMethods.find(Method); 536 if (Pos == OverriddenMethods.end()) 537 return 0; 538 539 return Pos->second.size(); 540} 541 542void ASTContext::addOverriddenMethod(const CXXMethodDecl *Method, 543 const CXXMethodDecl *Overridden) { 544 OverriddenMethods[Method].push_back(Overridden); 545} 546 547//===----------------------------------------------------------------------===// 548// Type Sizing and Analysis 549//===----------------------------------------------------------------------===// 550 551/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 552/// scalar floating point type. 553const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 554 const BuiltinType *BT = T->getAs<BuiltinType>(); 555 assert(BT && "Not a floating point type!"); 556 switch (BT->getKind()) { 557 default: assert(0 && "Not a floating point type!"); 558 case BuiltinType::Float: return Target.getFloatFormat(); 559 case BuiltinType::Double: return Target.getDoubleFormat(); 560 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 561 } 562} 563 564/// getDeclAlign - Return a conservative estimate of the alignment of the 565/// specified decl. Note that bitfields do not have a valid alignment, so 566/// this method will assert on them. 567/// If @p RefAsPointee, references are treated like their underlying type 568/// (for alignof), else they're treated like pointers (for CodeGen). 569CharUnits ASTContext::getDeclAlign(const Decl *D, bool RefAsPointee) const { 570 unsigned Align = Target.getCharWidth(); 571 572 bool UseAlignAttrOnly = false; 573 if (unsigned AlignFromAttr = D->getMaxAlignment()) { 574 Align = AlignFromAttr; 575 576 // __attribute__((aligned)) can increase or decrease alignment 577 // *except* on a struct or struct member, where it only increases 578 // alignment unless 'packed' is also specified. 579 // 580 // It is an error for [[align]] to decrease alignment, so we can 581 // ignore that possibility; Sema should diagnose it. 582 if (isa<FieldDecl>(D)) { 583 UseAlignAttrOnly = D->hasAttr<PackedAttr>() || 584 cast<FieldDecl>(D)->getParent()->hasAttr<PackedAttr>(); 585 } else { 586 UseAlignAttrOnly = true; 587 } 588 } 589 590 // If we're using the align attribute only, just ignore everything 591 // else about the declaration and its type. 592 if (UseAlignAttrOnly) { 593 // do nothing 594 595 } 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 } 620 621 // Fields can be subject to extra alignment constraints, like if 622 // the field is packed, the struct is packed, or the struct has a 623 // a max-field-alignment constraint (#pragma pack). So calculate 624 // the actual alignment of the field within the struct, and then 625 // (as we're expected to) constrain that by the alignment of the type. 626 if (const FieldDecl *field = dyn_cast<FieldDecl>(VD)) { 627 // So calculate the alignment of the field. 628 const ASTRecordLayout &layout = getASTRecordLayout(field->getParent()); 629 630 // Start with the record's overall alignment. 631 unsigned fieldAlign = toBits(layout.getAlignment()); 632 633 // Use the GCD of that and the offset within the record. 634 uint64_t offset = layout.getFieldOffset(field->getFieldIndex()); 635 if (offset > 0) { 636 // Alignment is always a power of 2, so the GCD will be a power of 2, 637 // which means we get to do this crazy thing instead of Euclid's. 638 uint64_t lowBitOfOffset = offset & (~offset + 1); 639 if (lowBitOfOffset < fieldAlign) 640 fieldAlign = static_cast<unsigned>(lowBitOfOffset); 641 } 642 643 Align = std::min(Align, fieldAlign); 644 } 645 } 646 647 return toCharUnitsFromBits(Align); 648} 649 650std::pair<CharUnits, CharUnits> 651ASTContext::getTypeInfoInChars(const Type *T) const { 652 std::pair<uint64_t, unsigned> Info = getTypeInfo(T); 653 return std::make_pair(toCharUnitsFromBits(Info.first), 654 toCharUnitsFromBits(Info.second)); 655} 656 657std::pair<CharUnits, CharUnits> 658ASTContext::getTypeInfoInChars(QualType T) const { 659 return getTypeInfoInChars(T.getTypePtr()); 660} 661 662/// getTypeSize - Return the size of the specified type, in bits. This method 663/// does not work on incomplete types. 664/// 665/// FIXME: Pointers into different addr spaces could have different sizes and 666/// alignment requirements: getPointerInfo should take an AddrSpace, this 667/// should take a QualType, &c. 668std::pair<uint64_t, unsigned> 669ASTContext::getTypeInfo(const Type *T) const { 670 uint64_t Width=0; 671 unsigned Align=8; 672 switch (T->getTypeClass()) { 673#define TYPE(Class, Base) 674#define ABSTRACT_TYPE(Class, Base) 675#define NON_CANONICAL_TYPE(Class, Base) 676#define DEPENDENT_TYPE(Class, Base) case Type::Class: 677#include "clang/AST/TypeNodes.def" 678 assert(false && "Should not see dependent types"); 679 break; 680 681 case Type::FunctionNoProto: 682 case Type::FunctionProto: 683 // GCC extension: alignof(function) = 32 bits 684 Width = 0; 685 Align = 32; 686 break; 687 688 case Type::IncompleteArray: 689 case Type::VariableArray: 690 Width = 0; 691 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 692 break; 693 694 case Type::ConstantArray: { 695 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 696 697 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 698 Width = EltInfo.first*CAT->getSize().getZExtValue(); 699 Align = EltInfo.second; 700 break; 701 } 702 case Type::ExtVector: 703 case Type::Vector: { 704 const VectorType *VT = cast<VectorType>(T); 705 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 706 Width = EltInfo.first*VT->getNumElements(); 707 Align = Width; 708 // If the alignment is not a power of 2, round up to the next power of 2. 709 // This happens for non-power-of-2 length vectors. 710 if (Align & (Align-1)) { 711 Align = llvm::NextPowerOf2(Align); 712 Width = llvm::RoundUpToAlignment(Width, Align); 713 } 714 break; 715 } 716 717 case Type::Builtin: 718 switch (cast<BuiltinType>(T)->getKind()) { 719 default: assert(0 && "Unknown builtin type!"); 720 case BuiltinType::Void: 721 // GCC extension: alignof(void) = 8 bits. 722 Width = 0; 723 Align = 8; 724 break; 725 726 case BuiltinType::Bool: 727 Width = Target.getBoolWidth(); 728 Align = Target.getBoolAlign(); 729 break; 730 case BuiltinType::Char_S: 731 case BuiltinType::Char_U: 732 case BuiltinType::UChar: 733 case BuiltinType::SChar: 734 Width = Target.getCharWidth(); 735 Align = Target.getCharAlign(); 736 break; 737 case BuiltinType::WChar_S: 738 case BuiltinType::WChar_U: 739 Width = Target.getWCharWidth(); 740 Align = Target.getWCharAlign(); 741 break; 742 case BuiltinType::Char16: 743 Width = Target.getChar16Width(); 744 Align = Target.getChar16Align(); 745 break; 746 case BuiltinType::Char32: 747 Width = Target.getChar32Width(); 748 Align = Target.getChar32Align(); 749 break; 750 case BuiltinType::UShort: 751 case BuiltinType::Short: 752 Width = Target.getShortWidth(); 753 Align = Target.getShortAlign(); 754 break; 755 case BuiltinType::UInt: 756 case BuiltinType::Int: 757 Width = Target.getIntWidth(); 758 Align = Target.getIntAlign(); 759 break; 760 case BuiltinType::ULong: 761 case BuiltinType::Long: 762 Width = Target.getLongWidth(); 763 Align = Target.getLongAlign(); 764 break; 765 case BuiltinType::ULongLong: 766 case BuiltinType::LongLong: 767 Width = Target.getLongLongWidth(); 768 Align = Target.getLongLongAlign(); 769 break; 770 case BuiltinType::Int128: 771 case BuiltinType::UInt128: 772 Width = 128; 773 Align = 128; // int128_t is 128-bit aligned on all targets. 774 break; 775 case BuiltinType::Float: 776 Width = Target.getFloatWidth(); 777 Align = Target.getFloatAlign(); 778 break; 779 case BuiltinType::Double: 780 Width = Target.getDoubleWidth(); 781 Align = Target.getDoubleAlign(); 782 break; 783 case BuiltinType::LongDouble: 784 Width = Target.getLongDoubleWidth(); 785 Align = Target.getLongDoubleAlign(); 786 break; 787 case BuiltinType::NullPtr: 788 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 789 Align = Target.getPointerAlign(0); // == sizeof(void*) 790 break; 791 case BuiltinType::ObjCId: 792 case BuiltinType::ObjCClass: 793 case BuiltinType::ObjCSel: 794 Width = Target.getPointerWidth(0); 795 Align = Target.getPointerAlign(0); 796 break; 797 } 798 break; 799 case Type::ObjCObjectPointer: 800 Width = Target.getPointerWidth(0); 801 Align = Target.getPointerAlign(0); 802 break; 803 case Type::BlockPointer: { 804 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 805 Width = Target.getPointerWidth(AS); 806 Align = Target.getPointerAlign(AS); 807 break; 808 } 809 case Type::LValueReference: 810 case Type::RValueReference: { 811 // alignof and sizeof should never enter this code path here, so we go 812 // the pointer route. 813 unsigned AS = cast<ReferenceType>(T)->getPointeeType().getAddressSpace(); 814 Width = Target.getPointerWidth(AS); 815 Align = Target.getPointerAlign(AS); 816 break; 817 } 818 case Type::Pointer: { 819 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 820 Width = Target.getPointerWidth(AS); 821 Align = Target.getPointerAlign(AS); 822 break; 823 } 824 case Type::MemberPointer: { 825 const MemberPointerType *MPT = cast<MemberPointerType>(T); 826 std::pair<uint64_t, unsigned> PtrDiffInfo = 827 getTypeInfo(getPointerDiffType()); 828 Width = PtrDiffInfo.first * ABI->getMemberPointerSize(MPT); 829 Align = PtrDiffInfo.second; 830 break; 831 } 832 case Type::Complex: { 833 // Complex types have the same alignment as their elements, but twice the 834 // size. 835 std::pair<uint64_t, unsigned> EltInfo = 836 getTypeInfo(cast<ComplexType>(T)->getElementType()); 837 Width = EltInfo.first*2; 838 Align = EltInfo.second; 839 break; 840 } 841 case Type::ObjCObject: 842 return getTypeInfo(cast<ObjCObjectType>(T)->getBaseType().getTypePtr()); 843 case Type::ObjCInterface: { 844 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 845 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 846 Width = toBits(Layout.getSize()); 847 Align = toBits(Layout.getAlignment()); 848 break; 849 } 850 case Type::Record: 851 case Type::Enum: { 852 const TagType *TT = cast<TagType>(T); 853 854 if (TT->getDecl()->isInvalidDecl()) { 855 Width = 1; 856 Align = 1; 857 break; 858 } 859 860 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 861 return getTypeInfo(ET->getDecl()->getIntegerType()); 862 863 const RecordType *RT = cast<RecordType>(TT); 864 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 865 Width = toBits(Layout.getSize()); 866 Align = toBits(Layout.getAlignment()); 867 break; 868 } 869 870 case Type::SubstTemplateTypeParm: 871 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 872 getReplacementType().getTypePtr()); 873 874 case Type::Auto: { 875 const AutoType *A = cast<AutoType>(T); 876 assert(A->isDeduced() && "Cannot request the size of a dependent type"); 877 return getTypeInfo(A->getDeducedType().getTypePtr()); 878 } 879 880 case Type::Paren: 881 return getTypeInfo(cast<ParenType>(T)->getInnerType().getTypePtr()); 882 883 case Type::Typedef: { 884 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 885 std::pair<uint64_t, unsigned> Info 886 = getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 887 // If the typedef has an aligned attribute on it, it overrides any computed 888 // alignment we have. This violates the GCC documentation (which says that 889 // attribute(aligned) can only round up) but matches its implementation. 890 if (unsigned AttrAlign = Typedef->getMaxAlignment()) 891 Align = AttrAlign; 892 else 893 Align = Info.second; 894 Width = Info.first; 895 break; 896 } 897 898 case Type::TypeOfExpr: 899 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 900 .getTypePtr()); 901 902 case Type::TypeOf: 903 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 904 905 case Type::Decltype: 906 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 907 .getTypePtr()); 908 909 case Type::Elaborated: 910 return getTypeInfo(cast<ElaboratedType>(T)->getNamedType().getTypePtr()); 911 912 case Type::Attributed: 913 return getTypeInfo( 914 cast<AttributedType>(T)->getEquivalentType().getTypePtr()); 915 916 case Type::TemplateSpecialization: 917 assert(getCanonicalType(T) != T && 918 "Cannot request the size of a dependent type"); 919 // FIXME: this is likely to be wrong once we support template 920 // aliases, since a template alias could refer to a typedef that 921 // has an __aligned__ attribute on it. 922 return getTypeInfo(getCanonicalType(T)); 923 } 924 925 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 926 return std::make_pair(Width, Align); 927} 928 929/// toCharUnitsFromBits - Convert a size in bits to a size in characters. 930CharUnits ASTContext::toCharUnitsFromBits(int64_t BitSize) const { 931 return CharUnits::fromQuantity(BitSize / getCharWidth()); 932} 933 934/// toBits - Convert a size in characters to a size in characters. 935int64_t ASTContext::toBits(CharUnits CharSize) const { 936 return CharSize.getQuantity() * getCharWidth(); 937} 938 939/// getTypeSizeInChars - Return the size of the specified type, in characters. 940/// This method does not work on incomplete types. 941CharUnits ASTContext::getTypeSizeInChars(QualType T) const { 942 return toCharUnitsFromBits(getTypeSize(T)); 943} 944CharUnits ASTContext::getTypeSizeInChars(const Type *T) const { 945 return toCharUnitsFromBits(getTypeSize(T)); 946} 947 948/// getTypeAlignInChars - Return the ABI-specified alignment of a type, in 949/// characters. This method does not work on incomplete types. 950CharUnits ASTContext::getTypeAlignInChars(QualType T) const { 951 return toCharUnitsFromBits(getTypeAlign(T)); 952} 953CharUnits ASTContext::getTypeAlignInChars(const Type *T) const { 954 return toCharUnitsFromBits(getTypeAlign(T)); 955} 956 957/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 958/// type for the current target in bits. This can be different than the ABI 959/// alignment in cases where it is beneficial for performance to overalign 960/// a data type. 961unsigned ASTContext::getPreferredTypeAlign(const Type *T) const { 962 unsigned ABIAlign = getTypeAlign(T); 963 964 // Double and long long should be naturally aligned if possible. 965 if (const ComplexType* CT = T->getAs<ComplexType>()) 966 T = CT->getElementType().getTypePtr(); 967 if (T->isSpecificBuiltinType(BuiltinType::Double) || 968 T->isSpecificBuiltinType(BuiltinType::LongLong)) 969 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 970 971 return ABIAlign; 972} 973 974/// ShallowCollectObjCIvars - 975/// Collect all ivars, including those synthesized, in the current class. 976/// 977void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 978 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) const { 979 // FIXME. This need be removed but there are two many places which 980 // assume const-ness of ObjCInterfaceDecl 981 ObjCInterfaceDecl *IDecl = const_cast<ObjCInterfaceDecl *>(OI); 982 for (ObjCIvarDecl *Iv = IDecl->all_declared_ivar_begin(); Iv; 983 Iv= Iv->getNextIvar()) 984 Ivars.push_back(Iv); 985} 986 987/// DeepCollectObjCIvars - 988/// This routine first collects all declared, but not synthesized, ivars in 989/// super class and then collects all ivars, including those synthesized for 990/// current class. This routine is used for implementation of current class 991/// when all ivars, declared and synthesized are known. 992/// 993void ASTContext::DeepCollectObjCIvars(const ObjCInterfaceDecl *OI, 994 bool leafClass, 995 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) const { 996 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 997 DeepCollectObjCIvars(SuperClass, false, Ivars); 998 if (!leafClass) { 999 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 1000 E = OI->ivar_end(); I != E; ++I) 1001 Ivars.push_back(*I); 1002 } 1003 else 1004 ShallowCollectObjCIvars(OI, Ivars); 1005} 1006 1007/// CollectInheritedProtocols - Collect all protocols in current class and 1008/// those inherited by it. 1009void ASTContext::CollectInheritedProtocols(const Decl *CDecl, 1010 llvm::SmallPtrSet<ObjCProtocolDecl*, 8> &Protocols) { 1011 if (const ObjCInterfaceDecl *OI = dyn_cast<ObjCInterfaceDecl>(CDecl)) { 1012 // We can use protocol_iterator here instead of 1013 // all_referenced_protocol_iterator since we are walking all categories. 1014 for (ObjCInterfaceDecl::all_protocol_iterator P = OI->all_referenced_protocol_begin(), 1015 PE = OI->all_referenced_protocol_end(); P != PE; ++P) { 1016 ObjCProtocolDecl *Proto = (*P); 1017 Protocols.insert(Proto); 1018 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1019 PE = Proto->protocol_end(); P != PE; ++P) { 1020 Protocols.insert(*P); 1021 CollectInheritedProtocols(*P, Protocols); 1022 } 1023 } 1024 1025 // Categories of this Interface. 1026 for (const ObjCCategoryDecl *CDeclChain = OI->getCategoryList(); 1027 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory()) 1028 CollectInheritedProtocols(CDeclChain, Protocols); 1029 if (ObjCInterfaceDecl *SD = OI->getSuperClass()) 1030 while (SD) { 1031 CollectInheritedProtocols(SD, Protocols); 1032 SD = SD->getSuperClass(); 1033 } 1034 } else if (const ObjCCategoryDecl *OC = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1035 for (ObjCCategoryDecl::protocol_iterator P = OC->protocol_begin(), 1036 PE = OC->protocol_end(); P != PE; ++P) { 1037 ObjCProtocolDecl *Proto = (*P); 1038 Protocols.insert(Proto); 1039 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1040 PE = Proto->protocol_end(); P != PE; ++P) 1041 CollectInheritedProtocols(*P, Protocols); 1042 } 1043 } else if (const ObjCProtocolDecl *OP = dyn_cast<ObjCProtocolDecl>(CDecl)) { 1044 for (ObjCProtocolDecl::protocol_iterator P = OP->protocol_begin(), 1045 PE = OP->protocol_end(); P != PE; ++P) { 1046 ObjCProtocolDecl *Proto = (*P); 1047 Protocols.insert(Proto); 1048 for (ObjCProtocolDecl::protocol_iterator P = Proto->protocol_begin(), 1049 PE = Proto->protocol_end(); P != PE; ++P) 1050 CollectInheritedProtocols(*P, Protocols); 1051 } 1052 } 1053} 1054 1055unsigned ASTContext::CountNonClassIvars(const ObjCInterfaceDecl *OI) const { 1056 unsigned count = 0; 1057 // Count ivars declared in class extension. 1058 for (const ObjCCategoryDecl *CDecl = OI->getFirstClassExtension(); CDecl; 1059 CDecl = CDecl->getNextClassExtension()) 1060 count += CDecl->ivar_size(); 1061 1062 // Count ivar defined in this class's implementation. This 1063 // includes synthesized ivars. 1064 if (ObjCImplementationDecl *ImplDecl = OI->getImplementation()) 1065 count += ImplDecl->ivar_size(); 1066 1067 return count; 1068} 1069 1070/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 1071ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 1072 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 1073 I = ObjCImpls.find(D); 1074 if (I != ObjCImpls.end()) 1075 return cast<ObjCImplementationDecl>(I->second); 1076 return 0; 1077} 1078/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 1079ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 1080 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 1081 I = ObjCImpls.find(D); 1082 if (I != ObjCImpls.end()) 1083 return cast<ObjCCategoryImplDecl>(I->second); 1084 return 0; 1085} 1086 1087/// \brief Set the implementation of ObjCInterfaceDecl. 1088void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 1089 ObjCImplementationDecl *ImplD) { 1090 assert(IFaceD && ImplD && "Passed null params"); 1091 ObjCImpls[IFaceD] = ImplD; 1092} 1093/// \brief Set the implementation of ObjCCategoryDecl. 1094void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 1095 ObjCCategoryImplDecl *ImplD) { 1096 assert(CatD && ImplD && "Passed null params"); 1097 ObjCImpls[CatD] = ImplD; 1098} 1099 1100/// \brief Get the copy initialization expression of VarDecl,or NULL if 1101/// none exists. 1102Expr *ASTContext::getBlockVarCopyInits(const VarDecl*VD) { 1103 assert(VD && "Passed null params"); 1104 assert(VD->hasAttr<BlocksAttr>() && 1105 "getBlockVarCopyInits - not __block var"); 1106 llvm::DenseMap<const VarDecl*, Expr*>::iterator 1107 I = BlockVarCopyInits.find(VD); 1108 return (I != BlockVarCopyInits.end()) ? cast<Expr>(I->second) : 0; 1109} 1110 1111/// \brief Set the copy inialization expression of a block var decl. 1112void ASTContext::setBlockVarCopyInits(VarDecl*VD, Expr* Init) { 1113 assert(VD && Init && "Passed null params"); 1114 assert(VD->hasAttr<BlocksAttr>() && 1115 "setBlockVarCopyInits - not __block var"); 1116 BlockVarCopyInits[VD] = Init; 1117} 1118 1119/// \brief Allocate an uninitialized TypeSourceInfo. 1120/// 1121/// The caller should initialize the memory held by TypeSourceInfo using 1122/// the TypeLoc wrappers. 1123/// 1124/// \param T the type that will be the basis for type source info. This type 1125/// should refer to how the declarator was written in source code, not to 1126/// what type semantic analysis resolved the declarator to. 1127TypeSourceInfo *ASTContext::CreateTypeSourceInfo(QualType T, 1128 unsigned DataSize) const { 1129 if (!DataSize) 1130 DataSize = TypeLoc::getFullDataSizeForType(T); 1131 else 1132 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 1133 "incorrect data size provided to CreateTypeSourceInfo!"); 1134 1135 TypeSourceInfo *TInfo = 1136 (TypeSourceInfo*)BumpAlloc.Allocate(sizeof(TypeSourceInfo) + DataSize, 8); 1137 new (TInfo) TypeSourceInfo(T); 1138 return TInfo; 1139} 1140 1141TypeSourceInfo *ASTContext::getTrivialTypeSourceInfo(QualType T, 1142 SourceLocation L) const { 1143 TypeSourceInfo *DI = CreateTypeSourceInfo(T); 1144 DI->getTypeLoc().initialize(const_cast<ASTContext &>(*this), L); 1145 return DI; 1146} 1147 1148const ASTRecordLayout & 1149ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) const { 1150 return getObjCLayout(D, 0); 1151} 1152 1153const ASTRecordLayout & 1154ASTContext::getASTObjCImplementationLayout( 1155 const ObjCImplementationDecl *D) const { 1156 return getObjCLayout(D->getClassInterface(), D); 1157} 1158 1159//===----------------------------------------------------------------------===// 1160// Type creation/memoization methods 1161//===----------------------------------------------------------------------===// 1162 1163QualType 1164ASTContext::getExtQualType(const Type *baseType, Qualifiers quals) const { 1165 unsigned fastQuals = quals.getFastQualifiers(); 1166 quals.removeFastQualifiers(); 1167 1168 // Check if we've already instantiated this type. 1169 llvm::FoldingSetNodeID ID; 1170 ExtQuals::Profile(ID, baseType, quals); 1171 void *insertPos = 0; 1172 if (ExtQuals *eq = ExtQualNodes.FindNodeOrInsertPos(ID, insertPos)) { 1173 assert(eq->getQualifiers() == quals); 1174 return QualType(eq, fastQuals); 1175 } 1176 1177 // If the base type is not canonical, make the appropriate canonical type. 1178 QualType canon; 1179 if (!baseType->isCanonicalUnqualified()) { 1180 SplitQualType canonSplit = baseType->getCanonicalTypeInternal().split(); 1181 canonSplit.second.addConsistentQualifiers(quals); 1182 canon = getExtQualType(canonSplit.first, canonSplit.second); 1183 1184 // Re-find the insert position. 1185 (void) ExtQualNodes.FindNodeOrInsertPos(ID, insertPos); 1186 } 1187 1188 ExtQuals *eq = new (*this, TypeAlignment) ExtQuals(baseType, canon, quals); 1189 ExtQualNodes.InsertNode(eq, insertPos); 1190 return QualType(eq, fastQuals); 1191} 1192 1193QualType 1194ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) const { 1195 QualType CanT = getCanonicalType(T); 1196 if (CanT.getAddressSpace() == AddressSpace) 1197 return T; 1198 1199 // If we are composing extended qualifiers together, merge together 1200 // into one ExtQuals node. 1201 QualifierCollector Quals; 1202 const Type *TypeNode = Quals.strip(T); 1203 1204 // If this type already has an address space specified, it cannot get 1205 // another one. 1206 assert(!Quals.hasAddressSpace() && 1207 "Type cannot be in multiple addr spaces!"); 1208 Quals.addAddressSpace(AddressSpace); 1209 1210 return getExtQualType(TypeNode, Quals); 1211} 1212 1213QualType ASTContext::getObjCGCQualType(QualType T, 1214 Qualifiers::GC GCAttr) const { 1215 QualType CanT = getCanonicalType(T); 1216 if (CanT.getObjCGCAttr() == GCAttr) 1217 return T; 1218 1219 if (const PointerType *ptr = T->getAs<PointerType>()) { 1220 QualType Pointee = ptr->getPointeeType(); 1221 if (Pointee->isAnyPointerType()) { 1222 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1223 return getPointerType(ResultType); 1224 } 1225 } 1226 1227 // If we are composing extended qualifiers together, merge together 1228 // into one ExtQuals node. 1229 QualifierCollector Quals; 1230 const Type *TypeNode = Quals.strip(T); 1231 1232 // If this type already has an ObjCGC specified, it cannot get 1233 // another one. 1234 assert(!Quals.hasObjCGCAttr() && 1235 "Type cannot have multiple ObjCGCs!"); 1236 Quals.addObjCGCAttr(GCAttr); 1237 1238 return getExtQualType(TypeNode, Quals); 1239} 1240 1241const FunctionType *ASTContext::adjustFunctionType(const FunctionType *T, 1242 FunctionType::ExtInfo Info) { 1243 if (T->getExtInfo() == Info) 1244 return T; 1245 1246 QualType Result; 1247 if (const FunctionNoProtoType *FNPT = dyn_cast<FunctionNoProtoType>(T)) { 1248 Result = getFunctionNoProtoType(FNPT->getResultType(), Info); 1249 } else { 1250 const FunctionProtoType *FPT = cast<FunctionProtoType>(T); 1251 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 1252 EPI.ExtInfo = Info; 1253 Result = getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 1254 FPT->getNumArgs(), EPI); 1255 } 1256 1257 return cast<FunctionType>(Result.getTypePtr()); 1258} 1259 1260/// getComplexType - Return the uniqued reference to the type for a complex 1261/// number with the specified element type. 1262QualType ASTContext::getComplexType(QualType T) const { 1263 // Unique pointers, to guarantee there is only one pointer of a particular 1264 // structure. 1265 llvm::FoldingSetNodeID ID; 1266 ComplexType::Profile(ID, T); 1267 1268 void *InsertPos = 0; 1269 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1270 return QualType(CT, 0); 1271 1272 // If the pointee type isn't canonical, this won't be a canonical type either, 1273 // so fill in the canonical type field. 1274 QualType Canonical; 1275 if (!T.isCanonical()) { 1276 Canonical = getComplexType(getCanonicalType(T)); 1277 1278 // Get the new insert position for the node we care about. 1279 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1280 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1281 } 1282 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1283 Types.push_back(New); 1284 ComplexTypes.InsertNode(New, InsertPos); 1285 return QualType(New, 0); 1286} 1287 1288/// getPointerType - Return the uniqued reference to the type for a pointer to 1289/// the specified type. 1290QualType ASTContext::getPointerType(QualType T) const { 1291 // Unique pointers, to guarantee there is only one pointer of a particular 1292 // structure. 1293 llvm::FoldingSetNodeID ID; 1294 PointerType::Profile(ID, T); 1295 1296 void *InsertPos = 0; 1297 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1298 return QualType(PT, 0); 1299 1300 // If the pointee type isn't canonical, this won't be a canonical type either, 1301 // so fill in the canonical type field. 1302 QualType Canonical; 1303 if (!T.isCanonical()) { 1304 Canonical = getPointerType(getCanonicalType(T)); 1305 1306 // Get the new insert position for the node we care about. 1307 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1308 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1309 } 1310 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1311 Types.push_back(New); 1312 PointerTypes.InsertNode(New, InsertPos); 1313 return QualType(New, 0); 1314} 1315 1316/// getBlockPointerType - Return the uniqued reference to the type for 1317/// a pointer to the specified block. 1318QualType ASTContext::getBlockPointerType(QualType T) const { 1319 assert(T->isFunctionType() && "block of function types only"); 1320 // Unique pointers, to guarantee there is only one block of a particular 1321 // structure. 1322 llvm::FoldingSetNodeID ID; 1323 BlockPointerType::Profile(ID, T); 1324 1325 void *InsertPos = 0; 1326 if (BlockPointerType *PT = 1327 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1328 return QualType(PT, 0); 1329 1330 // If the block pointee type isn't canonical, this won't be a canonical 1331 // type either so fill in the canonical type field. 1332 QualType Canonical; 1333 if (!T.isCanonical()) { 1334 Canonical = getBlockPointerType(getCanonicalType(T)); 1335 1336 // Get the new insert position for the node we care about. 1337 BlockPointerType *NewIP = 1338 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1339 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1340 } 1341 BlockPointerType *New 1342 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1343 Types.push_back(New); 1344 BlockPointerTypes.InsertNode(New, InsertPos); 1345 return QualType(New, 0); 1346} 1347 1348/// getLValueReferenceType - Return the uniqued reference to the type for an 1349/// lvalue reference to the specified type. 1350QualType 1351ASTContext::getLValueReferenceType(QualType T, bool SpelledAsLValue) const { 1352 // Unique pointers, to guarantee there is only one pointer of a particular 1353 // structure. 1354 llvm::FoldingSetNodeID ID; 1355 ReferenceType::Profile(ID, T, SpelledAsLValue); 1356 1357 void *InsertPos = 0; 1358 if (LValueReferenceType *RT = 1359 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1360 return QualType(RT, 0); 1361 1362 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1363 1364 // If the referencee type isn't canonical, this won't be a canonical type 1365 // either, so fill in the canonical type field. 1366 QualType Canonical; 1367 if (!SpelledAsLValue || InnerRef || !T.isCanonical()) { 1368 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1369 Canonical = getLValueReferenceType(getCanonicalType(PointeeType)); 1370 1371 // Get the new insert position for the node we care about. 1372 LValueReferenceType *NewIP = 1373 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1374 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1375 } 1376 1377 LValueReferenceType *New 1378 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical, 1379 SpelledAsLValue); 1380 Types.push_back(New); 1381 LValueReferenceTypes.InsertNode(New, InsertPos); 1382 1383 return QualType(New, 0); 1384} 1385 1386/// getRValueReferenceType - Return the uniqued reference to the type for an 1387/// rvalue reference to the specified type. 1388QualType ASTContext::getRValueReferenceType(QualType T) const { 1389 // Unique pointers, to guarantee there is only one pointer of a particular 1390 // structure. 1391 llvm::FoldingSetNodeID ID; 1392 ReferenceType::Profile(ID, T, false); 1393 1394 void *InsertPos = 0; 1395 if (RValueReferenceType *RT = 1396 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1397 return QualType(RT, 0); 1398 1399 const ReferenceType *InnerRef = T->getAs<ReferenceType>(); 1400 1401 // If the referencee type isn't canonical, this won't be a canonical type 1402 // either, so fill in the canonical type field. 1403 QualType Canonical; 1404 if (InnerRef || !T.isCanonical()) { 1405 QualType PointeeType = (InnerRef ? InnerRef->getPointeeType() : T); 1406 Canonical = getRValueReferenceType(getCanonicalType(PointeeType)); 1407 1408 // Get the new insert position for the node we care about. 1409 RValueReferenceType *NewIP = 1410 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1411 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1412 } 1413 1414 RValueReferenceType *New 1415 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1416 Types.push_back(New); 1417 RValueReferenceTypes.InsertNode(New, InsertPos); 1418 return QualType(New, 0); 1419} 1420 1421/// getMemberPointerType - Return the uniqued reference to the type for a 1422/// member pointer to the specified type, in the specified class. 1423QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) const { 1424 // Unique pointers, to guarantee there is only one pointer of a particular 1425 // structure. 1426 llvm::FoldingSetNodeID ID; 1427 MemberPointerType::Profile(ID, T, Cls); 1428 1429 void *InsertPos = 0; 1430 if (MemberPointerType *PT = 1431 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1432 return QualType(PT, 0); 1433 1434 // If the pointee or class type isn't canonical, this won't be a canonical 1435 // type either, so fill in the canonical type field. 1436 QualType Canonical; 1437 if (!T.isCanonical() || !Cls->isCanonicalUnqualified()) { 1438 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1439 1440 // Get the new insert position for the node we care about. 1441 MemberPointerType *NewIP = 1442 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1443 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1444 } 1445 MemberPointerType *New 1446 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1447 Types.push_back(New); 1448 MemberPointerTypes.InsertNode(New, InsertPos); 1449 return QualType(New, 0); 1450} 1451 1452/// getConstantArrayType - Return the unique reference to the type for an 1453/// array of the specified element type. 1454QualType ASTContext::getConstantArrayType(QualType EltTy, 1455 const llvm::APInt &ArySizeIn, 1456 ArrayType::ArraySizeModifier ASM, 1457 unsigned IndexTypeQuals) const { 1458 assert((EltTy->isDependentType() || 1459 EltTy->isIncompleteType() || EltTy->isConstantSizeType()) && 1460 "Constant array of VLAs is illegal!"); 1461 1462 // Convert the array size into a canonical width matching the pointer size for 1463 // the target. 1464 llvm::APInt ArySize(ArySizeIn); 1465 ArySize = 1466 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1467 1468 llvm::FoldingSetNodeID ID; 1469 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, IndexTypeQuals); 1470 1471 void *InsertPos = 0; 1472 if (ConstantArrayType *ATP = 1473 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1474 return QualType(ATP, 0); 1475 1476 // If the element type isn't canonical or has qualifiers, this won't 1477 // be a canonical type either, so fill in the canonical type field. 1478 QualType Canon; 1479 if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) { 1480 SplitQualType canonSplit = getCanonicalType(EltTy).split(); 1481 Canon = getConstantArrayType(QualType(canonSplit.first, 0), ArySize, 1482 ASM, IndexTypeQuals); 1483 Canon = getQualifiedType(Canon, canonSplit.second); 1484 1485 // Get the new insert position for the node we care about. 1486 ConstantArrayType *NewIP = 1487 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1488 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1489 } 1490 1491 ConstantArrayType *New = new(*this,TypeAlignment) 1492 ConstantArrayType(EltTy, Canon, ArySize, ASM, IndexTypeQuals); 1493 ConstantArrayTypes.InsertNode(New, InsertPos); 1494 Types.push_back(New); 1495 return QualType(New, 0); 1496} 1497 1498/// getVariableArrayDecayedType - Turns the given type, which may be 1499/// variably-modified, into the corresponding type with all the known 1500/// sizes replaced with [*]. 1501QualType ASTContext::getVariableArrayDecayedType(QualType type) const { 1502 // Vastly most common case. 1503 if (!type->isVariablyModifiedType()) return type; 1504 1505 QualType result; 1506 1507 SplitQualType split = type.getSplitDesugaredType(); 1508 const Type *ty = split.first; 1509 switch (ty->getTypeClass()) { 1510#define TYPE(Class, Base) 1511#define ABSTRACT_TYPE(Class, Base) 1512#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 1513#include "clang/AST/TypeNodes.def" 1514 llvm_unreachable("didn't desugar past all non-canonical types?"); 1515 1516 // These types should never be variably-modified. 1517 case Type::Builtin: 1518 case Type::Complex: 1519 case Type::Vector: 1520 case Type::ExtVector: 1521 case Type::DependentSizedExtVector: 1522 case Type::ObjCObject: 1523 case Type::ObjCInterface: 1524 case Type::ObjCObjectPointer: 1525 case Type::Record: 1526 case Type::Enum: 1527 case Type::UnresolvedUsing: 1528 case Type::TypeOfExpr: 1529 case Type::TypeOf: 1530 case Type::Decltype: 1531 case Type::DependentName: 1532 case Type::InjectedClassName: 1533 case Type::TemplateSpecialization: 1534 case Type::DependentTemplateSpecialization: 1535 case Type::TemplateTypeParm: 1536 case Type::SubstTemplateTypeParmPack: 1537 case Type::Auto: 1538 case Type::PackExpansion: 1539 llvm_unreachable("type should never be variably-modified"); 1540 1541 // These types can be variably-modified but should never need to 1542 // further decay. 1543 case Type::FunctionNoProto: 1544 case Type::FunctionProto: 1545 case Type::BlockPointer: 1546 case Type::MemberPointer: 1547 return type; 1548 1549 // These types can be variably-modified. All these modifications 1550 // preserve structure except as noted by comments. 1551 // TODO: if we ever care about optimizing VLAs, there are no-op 1552 // optimizations available here. 1553 case Type::Pointer: 1554 result = getPointerType(getVariableArrayDecayedType( 1555 cast<PointerType>(ty)->getPointeeType())); 1556 break; 1557 1558 case Type::LValueReference: { 1559 const LValueReferenceType *lv = cast<LValueReferenceType>(ty); 1560 result = getLValueReferenceType( 1561 getVariableArrayDecayedType(lv->getPointeeType()), 1562 lv->isSpelledAsLValue()); 1563 break; 1564 } 1565 1566 case Type::RValueReference: { 1567 const RValueReferenceType *lv = cast<RValueReferenceType>(ty); 1568 result = getRValueReferenceType( 1569 getVariableArrayDecayedType(lv->getPointeeType())); 1570 break; 1571 } 1572 1573 case Type::ConstantArray: { 1574 const ConstantArrayType *cat = cast<ConstantArrayType>(ty); 1575 result = getConstantArrayType( 1576 getVariableArrayDecayedType(cat->getElementType()), 1577 cat->getSize(), 1578 cat->getSizeModifier(), 1579 cat->getIndexTypeCVRQualifiers()); 1580 break; 1581 } 1582 1583 case Type::DependentSizedArray: { 1584 const DependentSizedArrayType *dat = cast<DependentSizedArrayType>(ty); 1585 result = getDependentSizedArrayType( 1586 getVariableArrayDecayedType(dat->getElementType()), 1587 dat->getSizeExpr(), 1588 dat->getSizeModifier(), 1589 dat->getIndexTypeCVRQualifiers(), 1590 dat->getBracketsRange()); 1591 break; 1592 } 1593 1594 // Turn incomplete types into [*] types. 1595 case Type::IncompleteArray: { 1596 const IncompleteArrayType *iat = cast<IncompleteArrayType>(ty); 1597 result = getVariableArrayType( 1598 getVariableArrayDecayedType(iat->getElementType()), 1599 /*size*/ 0, 1600 ArrayType::Normal, 1601 iat->getIndexTypeCVRQualifiers(), 1602 SourceRange()); 1603 break; 1604 } 1605 1606 // Turn VLA types into [*] types. 1607 case Type::VariableArray: { 1608 const VariableArrayType *vat = cast<VariableArrayType>(ty); 1609 result = getVariableArrayType( 1610 getVariableArrayDecayedType(vat->getElementType()), 1611 /*size*/ 0, 1612 ArrayType::Star, 1613 vat->getIndexTypeCVRQualifiers(), 1614 vat->getBracketsRange()); 1615 break; 1616 } 1617 } 1618 1619 // Apply the top-level qualifiers from the original. 1620 return getQualifiedType(result, split.second); 1621} 1622 1623/// getVariableArrayType - Returns a non-unique reference to the type for a 1624/// variable array of the specified element type. 1625QualType ASTContext::getVariableArrayType(QualType EltTy, 1626 Expr *NumElts, 1627 ArrayType::ArraySizeModifier ASM, 1628 unsigned IndexTypeQuals, 1629 SourceRange Brackets) const { 1630 // Since we don't unique expressions, it isn't possible to unique VLA's 1631 // that have an expression provided for their size. 1632 QualType Canon; 1633 1634 // Be sure to pull qualifiers off the element type. 1635 if (!EltTy.isCanonical() || EltTy.hasLocalQualifiers()) { 1636 SplitQualType canonSplit = getCanonicalType(EltTy).split(); 1637 Canon = getVariableArrayType(QualType(canonSplit.first, 0), NumElts, ASM, 1638 IndexTypeQuals, Brackets); 1639 Canon = getQualifiedType(Canon, canonSplit.second); 1640 } 1641 1642 VariableArrayType *New = new(*this, TypeAlignment) 1643 VariableArrayType(EltTy, Canon, NumElts, ASM, IndexTypeQuals, Brackets); 1644 1645 VariableArrayTypes.push_back(New); 1646 Types.push_back(New); 1647 return QualType(New, 0); 1648} 1649 1650/// getDependentSizedArrayType - Returns a non-unique reference to 1651/// the type for a dependently-sized array of the specified element 1652/// type. 1653QualType ASTContext::getDependentSizedArrayType(QualType elementType, 1654 Expr *numElements, 1655 ArrayType::ArraySizeModifier ASM, 1656 unsigned elementTypeQuals, 1657 SourceRange brackets) const { 1658 assert((!numElements || numElements->isTypeDependent() || 1659 numElements->isValueDependent()) && 1660 "Size must be type- or value-dependent!"); 1661 1662 // Dependently-sized array types that do not have a specified number 1663 // of elements will have their sizes deduced from a dependent 1664 // initializer. We do no canonicalization here at all, which is okay 1665 // because they can't be used in most locations. 1666 if (!numElements) { 1667 DependentSizedArrayType *newType 1668 = new (*this, TypeAlignment) 1669 DependentSizedArrayType(*this, elementType, QualType(), 1670 numElements, ASM, elementTypeQuals, 1671 brackets); 1672 Types.push_back(newType); 1673 return QualType(newType, 0); 1674 } 1675 1676 // Otherwise, we actually build a new type every time, but we 1677 // also build a canonical type. 1678 1679 SplitQualType canonElementType = getCanonicalType(elementType).split(); 1680 1681 void *insertPos = 0; 1682 llvm::FoldingSetNodeID ID; 1683 DependentSizedArrayType::Profile(ID, *this, 1684 QualType(canonElementType.first, 0), 1685 ASM, elementTypeQuals, numElements); 1686 1687 // Look for an existing type with these properties. 1688 DependentSizedArrayType *canonTy = 1689 DependentSizedArrayTypes.FindNodeOrInsertPos(ID, insertPos); 1690 1691 // If we don't have one, build one. 1692 if (!canonTy) { 1693 canonTy = new (*this, TypeAlignment) 1694 DependentSizedArrayType(*this, QualType(canonElementType.first, 0), 1695 QualType(), numElements, ASM, elementTypeQuals, 1696 brackets); 1697 DependentSizedArrayTypes.InsertNode(canonTy, insertPos); 1698 Types.push_back(canonTy); 1699 } 1700 1701 // Apply qualifiers from the element type to the array. 1702 QualType canon = getQualifiedType(QualType(canonTy,0), 1703 canonElementType.second); 1704 1705 // If we didn't need extra canonicalization for the element type, 1706 // then just use that as our result. 1707 if (QualType(canonElementType.first, 0) == elementType) 1708 return canon; 1709 1710 // Otherwise, we need to build a type which follows the spelling 1711 // of the element type. 1712 DependentSizedArrayType *sugaredType 1713 = new (*this, TypeAlignment) 1714 DependentSizedArrayType(*this, elementType, canon, numElements, 1715 ASM, elementTypeQuals, brackets); 1716 Types.push_back(sugaredType); 1717 return QualType(sugaredType, 0); 1718} 1719 1720QualType ASTContext::getIncompleteArrayType(QualType elementType, 1721 ArrayType::ArraySizeModifier ASM, 1722 unsigned elementTypeQuals) const { 1723 llvm::FoldingSetNodeID ID; 1724 IncompleteArrayType::Profile(ID, elementType, ASM, elementTypeQuals); 1725 1726 void *insertPos = 0; 1727 if (IncompleteArrayType *iat = 1728 IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos)) 1729 return QualType(iat, 0); 1730 1731 // If the element type isn't canonical, this won't be a canonical type 1732 // either, so fill in the canonical type field. We also have to pull 1733 // qualifiers off the element type. 1734 QualType canon; 1735 1736 if (!elementType.isCanonical() || elementType.hasLocalQualifiers()) { 1737 SplitQualType canonSplit = getCanonicalType(elementType).split(); 1738 canon = getIncompleteArrayType(QualType(canonSplit.first, 0), 1739 ASM, elementTypeQuals); 1740 canon = getQualifiedType(canon, canonSplit.second); 1741 1742 // Get the new insert position for the node we care about. 1743 IncompleteArrayType *existing = 1744 IncompleteArrayTypes.FindNodeOrInsertPos(ID, insertPos); 1745 assert(!existing && "Shouldn't be in the map!"); (void) existing; 1746 } 1747 1748 IncompleteArrayType *newType = new (*this, TypeAlignment) 1749 IncompleteArrayType(elementType, canon, ASM, elementTypeQuals); 1750 1751 IncompleteArrayTypes.InsertNode(newType, insertPos); 1752 Types.push_back(newType); 1753 return QualType(newType, 0); 1754} 1755 1756/// getVectorType - Return the unique reference to a vector type of 1757/// the specified element type and size. VectorType must be a built-in type. 1758QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts, 1759 VectorType::VectorKind VecKind) const { 1760 assert(vecType->isBuiltinType()); 1761 1762 // Check if we've already instantiated a vector of this type. 1763 llvm::FoldingSetNodeID ID; 1764 VectorType::Profile(ID, vecType, NumElts, Type::Vector, VecKind); 1765 1766 void *InsertPos = 0; 1767 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1768 return QualType(VTP, 0); 1769 1770 // If the element type isn't canonical, this won't be a canonical type either, 1771 // so fill in the canonical type field. 1772 QualType Canonical; 1773 if (!vecType.isCanonical()) { 1774 Canonical = getVectorType(getCanonicalType(vecType), NumElts, VecKind); 1775 1776 // Get the new insert position for the node we care about. 1777 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1778 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1779 } 1780 VectorType *New = new (*this, TypeAlignment) 1781 VectorType(vecType, NumElts, Canonical, VecKind); 1782 VectorTypes.InsertNode(New, InsertPos); 1783 Types.push_back(New); 1784 return QualType(New, 0); 1785} 1786 1787/// getExtVectorType - Return the unique reference to an extended vector type of 1788/// the specified element type and size. VectorType must be a built-in type. 1789QualType 1790ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) const { 1791 assert(vecType->isBuiltinType()); 1792 1793 // Check if we've already instantiated a vector of this type. 1794 llvm::FoldingSetNodeID ID; 1795 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector, 1796 VectorType::GenericVector); 1797 void *InsertPos = 0; 1798 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1799 return QualType(VTP, 0); 1800 1801 // If the element type isn't canonical, this won't be a canonical type either, 1802 // so fill in the canonical type field. 1803 QualType Canonical; 1804 if (!vecType.isCanonical()) { 1805 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1806 1807 // Get the new insert position for the node we care about. 1808 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1809 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1810 } 1811 ExtVectorType *New = new (*this, TypeAlignment) 1812 ExtVectorType(vecType, NumElts, Canonical); 1813 VectorTypes.InsertNode(New, InsertPos); 1814 Types.push_back(New); 1815 return QualType(New, 0); 1816} 1817 1818QualType 1819ASTContext::getDependentSizedExtVectorType(QualType vecType, 1820 Expr *SizeExpr, 1821 SourceLocation AttrLoc) const { 1822 llvm::FoldingSetNodeID ID; 1823 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1824 SizeExpr); 1825 1826 void *InsertPos = 0; 1827 DependentSizedExtVectorType *Canon 1828 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1829 DependentSizedExtVectorType *New; 1830 if (Canon) { 1831 // We already have a canonical version of this array type; use it as 1832 // the canonical type for a newly-built type. 1833 New = new (*this, TypeAlignment) 1834 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1835 SizeExpr, AttrLoc); 1836 } else { 1837 QualType CanonVecTy = getCanonicalType(vecType); 1838 if (CanonVecTy == vecType) { 1839 New = new (*this, TypeAlignment) 1840 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1841 AttrLoc); 1842 1843 DependentSizedExtVectorType *CanonCheck 1844 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1845 assert(!CanonCheck && "Dependent-sized ext_vector canonical type broken"); 1846 (void)CanonCheck; 1847 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1848 } else { 1849 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1850 SourceLocation()); 1851 New = new (*this, TypeAlignment) 1852 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1853 } 1854 } 1855 1856 Types.push_back(New); 1857 return QualType(New, 0); 1858} 1859 1860/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1861/// 1862QualType 1863ASTContext::getFunctionNoProtoType(QualType ResultTy, 1864 const FunctionType::ExtInfo &Info) const { 1865 const CallingConv CallConv = Info.getCC(); 1866 // Unique functions, to guarantee there is only one function of a particular 1867 // structure. 1868 llvm::FoldingSetNodeID ID; 1869 FunctionNoProtoType::Profile(ID, ResultTy, Info); 1870 1871 void *InsertPos = 0; 1872 if (FunctionNoProtoType *FT = 1873 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1874 return QualType(FT, 0); 1875 1876 QualType Canonical; 1877 if (!ResultTy.isCanonical() || 1878 getCanonicalCallConv(CallConv) != CallConv) { 1879 Canonical = 1880 getFunctionNoProtoType(getCanonicalType(ResultTy), 1881 Info.withCallingConv(getCanonicalCallConv(CallConv))); 1882 1883 // Get the new insert position for the node we care about. 1884 FunctionNoProtoType *NewIP = 1885 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1886 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1887 } 1888 1889 FunctionNoProtoType *New = new (*this, TypeAlignment) 1890 FunctionNoProtoType(ResultTy, Canonical, Info); 1891 Types.push_back(New); 1892 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1893 return QualType(New, 0); 1894} 1895 1896/// getFunctionType - Return a normal function type with a typed argument 1897/// list. isVariadic indicates whether the argument list includes '...'. 1898QualType 1899ASTContext::getFunctionType(QualType ResultTy, 1900 const QualType *ArgArray, unsigned NumArgs, 1901 const FunctionProtoType::ExtProtoInfo &EPI) const { 1902 // Unique functions, to guarantee there is only one function of a particular 1903 // structure. 1904 llvm::FoldingSetNodeID ID; 1905 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, EPI); 1906 1907 void *InsertPos = 0; 1908 if (FunctionProtoType *FTP = 1909 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1910 return QualType(FTP, 0); 1911 1912 // Determine whether the type being created is already canonical or not. 1913 bool isCanonical = !EPI.HasExceptionSpec && ResultTy.isCanonical(); 1914 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1915 if (!ArgArray[i].isCanonicalAsParam()) 1916 isCanonical = false; 1917 1918 const CallingConv CallConv = EPI.ExtInfo.getCC(); 1919 1920 // If this type isn't canonical, get the canonical version of it. 1921 // The exception spec is not part of the canonical type. 1922 QualType Canonical; 1923 if (!isCanonical || getCanonicalCallConv(CallConv) != CallConv) { 1924 llvm::SmallVector<QualType, 16> CanonicalArgs; 1925 CanonicalArgs.reserve(NumArgs); 1926 for (unsigned i = 0; i != NumArgs; ++i) 1927 CanonicalArgs.push_back(getCanonicalParamType(ArgArray[i])); 1928 1929 FunctionProtoType::ExtProtoInfo CanonicalEPI = EPI; 1930 if (CanonicalEPI.HasExceptionSpec) { 1931 CanonicalEPI.HasExceptionSpec = false; 1932 CanonicalEPI.HasAnyExceptionSpec = false; 1933 CanonicalEPI.NumExceptions = 0; 1934 } 1935 CanonicalEPI.ExtInfo 1936 = CanonicalEPI.ExtInfo.withCallingConv(getCanonicalCallConv(CallConv)); 1937 1938 Canonical = getFunctionType(getCanonicalType(ResultTy), 1939 CanonicalArgs.data(), NumArgs, 1940 CanonicalEPI); 1941 1942 // Get the new insert position for the node we care about. 1943 FunctionProtoType *NewIP = 1944 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1945 assert(NewIP == 0 && "Shouldn't be in the map!"); (void)NewIP; 1946 } 1947 1948 // FunctionProtoType objects are allocated with extra bytes after them 1949 // for two variable size arrays (for parameter and exception types) at the 1950 // end of them. 1951 size_t Size = sizeof(FunctionProtoType) + 1952 NumArgs * sizeof(QualType) + 1953 EPI.NumExceptions * sizeof(QualType); 1954 FunctionProtoType *FTP = (FunctionProtoType*) Allocate(Size, TypeAlignment); 1955 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, Canonical, EPI); 1956 Types.push_back(FTP); 1957 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1958 return QualType(FTP, 0); 1959} 1960 1961#ifndef NDEBUG 1962static bool NeedsInjectedClassNameType(const RecordDecl *D) { 1963 if (!isa<CXXRecordDecl>(D)) return false; 1964 const CXXRecordDecl *RD = cast<CXXRecordDecl>(D); 1965 if (isa<ClassTemplatePartialSpecializationDecl>(RD)) 1966 return true; 1967 if (RD->getDescribedClassTemplate() && 1968 !isa<ClassTemplateSpecializationDecl>(RD)) 1969 return true; 1970 return false; 1971} 1972#endif 1973 1974/// getInjectedClassNameType - Return the unique reference to the 1975/// injected class name type for the specified templated declaration. 1976QualType ASTContext::getInjectedClassNameType(CXXRecordDecl *Decl, 1977 QualType TST) const { 1978 assert(NeedsInjectedClassNameType(Decl)); 1979 if (Decl->TypeForDecl) { 1980 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1981 } else if (CXXRecordDecl *PrevDecl = Decl->getPreviousDeclaration()) { 1982 assert(PrevDecl->TypeForDecl && "previous declaration has no type"); 1983 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1984 assert(isa<InjectedClassNameType>(Decl->TypeForDecl)); 1985 } else { 1986 Type *newType = 1987 new (*this, TypeAlignment) InjectedClassNameType(Decl, TST); 1988 Decl->TypeForDecl = newType; 1989 Types.push_back(newType); 1990 } 1991 return QualType(Decl->TypeForDecl, 0); 1992} 1993 1994/// getTypeDeclType - Return the unique reference to the type for the 1995/// specified type declaration. 1996QualType ASTContext::getTypeDeclTypeSlow(const TypeDecl *Decl) const { 1997 assert(Decl && "Passed null for Decl param"); 1998 assert(!Decl->TypeForDecl && "TypeForDecl present in slow case"); 1999 2000 if (const TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 2001 return getTypedefType(Typedef); 2002 2003 assert(!isa<TemplateTypeParmDecl>(Decl) && 2004 "Template type parameter types are always available."); 2005 2006 if (const RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 2007 assert(!Record->getPreviousDeclaration() && 2008 "struct/union has previous declaration"); 2009 assert(!NeedsInjectedClassNameType(Record)); 2010 return getRecordType(Record); 2011 } else if (const EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 2012 assert(!Enum->getPreviousDeclaration() && 2013 "enum has previous declaration"); 2014 return getEnumType(Enum); 2015 } else if (const UnresolvedUsingTypenameDecl *Using = 2016 dyn_cast<UnresolvedUsingTypenameDecl>(Decl)) { 2017 Type *newType = new (*this, TypeAlignment) UnresolvedUsingType(Using); 2018 Decl->TypeForDecl = newType; 2019 Types.push_back(newType); 2020 } else 2021 llvm_unreachable("TypeDecl without a type?"); 2022 2023 return QualType(Decl->TypeForDecl, 0); 2024} 2025 2026/// getTypedefType - Return the unique reference to the type for the 2027/// specified typename decl. 2028QualType 2029ASTContext::getTypedefType(const TypedefDecl *Decl, QualType Canonical) const { 2030 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2031 2032 if (Canonical.isNull()) 2033 Canonical = getCanonicalType(Decl->getUnderlyingType()); 2034 TypedefType *newType = new(*this, TypeAlignment) 2035 TypedefType(Type::Typedef, Decl, Canonical); 2036 Decl->TypeForDecl = newType; 2037 Types.push_back(newType); 2038 return QualType(newType, 0); 2039} 2040 2041QualType ASTContext::getRecordType(const RecordDecl *Decl) const { 2042 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2043 2044 if (const RecordDecl *PrevDecl = Decl->getPreviousDeclaration()) 2045 if (PrevDecl->TypeForDecl) 2046 return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0); 2047 2048 RecordType *newType = new (*this, TypeAlignment) RecordType(Decl); 2049 Decl->TypeForDecl = newType; 2050 Types.push_back(newType); 2051 return QualType(newType, 0); 2052} 2053 2054QualType ASTContext::getEnumType(const EnumDecl *Decl) const { 2055 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 2056 2057 if (const EnumDecl *PrevDecl = Decl->getPreviousDeclaration()) 2058 if (PrevDecl->TypeForDecl) 2059 return QualType(Decl->TypeForDecl = PrevDecl->TypeForDecl, 0); 2060 2061 EnumType *newType = new (*this, TypeAlignment) EnumType(Decl); 2062 Decl->TypeForDecl = newType; 2063 Types.push_back(newType); 2064 return QualType(newType, 0); 2065} 2066 2067QualType ASTContext::getAttributedType(AttributedType::Kind attrKind, 2068 QualType modifiedType, 2069 QualType equivalentType) { 2070 llvm::FoldingSetNodeID id; 2071 AttributedType::Profile(id, attrKind, modifiedType, equivalentType); 2072 2073 void *insertPos = 0; 2074 AttributedType *type = AttributedTypes.FindNodeOrInsertPos(id, insertPos); 2075 if (type) return QualType(type, 0); 2076 2077 QualType canon = getCanonicalType(equivalentType); 2078 type = new (*this, TypeAlignment) 2079 AttributedType(canon, attrKind, modifiedType, equivalentType); 2080 2081 Types.push_back(type); 2082 AttributedTypes.InsertNode(type, insertPos); 2083 2084 return QualType(type, 0); 2085} 2086 2087 2088/// \brief Retrieve a substitution-result type. 2089QualType 2090ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 2091 QualType Replacement) const { 2092 assert(Replacement.isCanonical() 2093 && "replacement types must always be canonical"); 2094 2095 llvm::FoldingSetNodeID ID; 2096 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 2097 void *InsertPos = 0; 2098 SubstTemplateTypeParmType *SubstParm 2099 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2100 2101 if (!SubstParm) { 2102 SubstParm = new (*this, TypeAlignment) 2103 SubstTemplateTypeParmType(Parm, Replacement); 2104 Types.push_back(SubstParm); 2105 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 2106 } 2107 2108 return QualType(SubstParm, 0); 2109} 2110 2111/// \brief Retrieve a 2112QualType ASTContext::getSubstTemplateTypeParmPackType( 2113 const TemplateTypeParmType *Parm, 2114 const TemplateArgument &ArgPack) { 2115#ifndef NDEBUG 2116 for (TemplateArgument::pack_iterator P = ArgPack.pack_begin(), 2117 PEnd = ArgPack.pack_end(); 2118 P != PEnd; ++P) { 2119 assert(P->getKind() == TemplateArgument::Type &&"Pack contains a non-type"); 2120 assert(P->getAsType().isCanonical() && "Pack contains non-canonical type"); 2121 } 2122#endif 2123 2124 llvm::FoldingSetNodeID ID; 2125 SubstTemplateTypeParmPackType::Profile(ID, Parm, ArgPack); 2126 void *InsertPos = 0; 2127 if (SubstTemplateTypeParmPackType *SubstParm 2128 = SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos)) 2129 return QualType(SubstParm, 0); 2130 2131 QualType Canon; 2132 if (!Parm->isCanonicalUnqualified()) { 2133 Canon = getCanonicalType(QualType(Parm, 0)); 2134 Canon = getSubstTemplateTypeParmPackType(cast<TemplateTypeParmType>(Canon), 2135 ArgPack); 2136 SubstTemplateTypeParmPackTypes.FindNodeOrInsertPos(ID, InsertPos); 2137 } 2138 2139 SubstTemplateTypeParmPackType *SubstParm 2140 = new (*this, TypeAlignment) SubstTemplateTypeParmPackType(Parm, Canon, 2141 ArgPack); 2142 Types.push_back(SubstParm); 2143 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 2144 return QualType(SubstParm, 0); 2145} 2146 2147/// \brief Retrieve the template type parameter type for a template 2148/// parameter or parameter pack with the given depth, index, and (optionally) 2149/// name. 2150QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 2151 bool ParameterPack, 2152 IdentifierInfo *Name) const { 2153 llvm::FoldingSetNodeID ID; 2154 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 2155 void *InsertPos = 0; 2156 TemplateTypeParmType *TypeParm 2157 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2158 2159 if (TypeParm) 2160 return QualType(TypeParm, 0); 2161 2162 if (Name) { 2163 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 2164 TypeParm = new (*this, TypeAlignment) 2165 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 2166 2167 TemplateTypeParmType *TypeCheck 2168 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 2169 assert(!TypeCheck && "Template type parameter canonical type broken"); 2170 (void)TypeCheck; 2171 } else 2172 TypeParm = new (*this, TypeAlignment) 2173 TemplateTypeParmType(Depth, Index, ParameterPack); 2174 2175 Types.push_back(TypeParm); 2176 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 2177 2178 return QualType(TypeParm, 0); 2179} 2180 2181TypeSourceInfo * 2182ASTContext::getTemplateSpecializationTypeInfo(TemplateName Name, 2183 SourceLocation NameLoc, 2184 const TemplateArgumentListInfo &Args, 2185 QualType CanonType) const { 2186 QualType TST = getTemplateSpecializationType(Name, Args, CanonType); 2187 2188 TypeSourceInfo *DI = CreateTypeSourceInfo(TST); 2189 TemplateSpecializationTypeLoc TL 2190 = cast<TemplateSpecializationTypeLoc>(DI->getTypeLoc()); 2191 TL.setTemplateNameLoc(NameLoc); 2192 TL.setLAngleLoc(Args.getLAngleLoc()); 2193 TL.setRAngleLoc(Args.getRAngleLoc()); 2194 for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i) 2195 TL.setArgLocInfo(i, Args[i].getLocInfo()); 2196 return DI; 2197} 2198 2199QualType 2200ASTContext::getTemplateSpecializationType(TemplateName Template, 2201 const TemplateArgumentListInfo &Args, 2202 QualType Canon) const { 2203 unsigned NumArgs = Args.size(); 2204 2205 llvm::SmallVector<TemplateArgument, 4> ArgVec; 2206 ArgVec.reserve(NumArgs); 2207 for (unsigned i = 0; i != NumArgs; ++i) 2208 ArgVec.push_back(Args[i].getArgument()); 2209 2210 return getTemplateSpecializationType(Template, ArgVec.data(), NumArgs, 2211 Canon); 2212} 2213 2214QualType 2215ASTContext::getTemplateSpecializationType(TemplateName Template, 2216 const TemplateArgument *Args, 2217 unsigned NumArgs, 2218 QualType Canon) const { 2219 if (!Canon.isNull()) 2220 Canon = getCanonicalType(Canon); 2221 else 2222 Canon = getCanonicalTemplateSpecializationType(Template, Args, NumArgs); 2223 2224 // Allocate the (non-canonical) template specialization type, but don't 2225 // try to unique it: these types typically have location information that 2226 // we don't unique and don't want to lose. 2227 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 2228 sizeof(TemplateArgument) * NumArgs), 2229 TypeAlignment); 2230 TemplateSpecializationType *Spec 2231 = new (Mem) TemplateSpecializationType(Template, 2232 Args, NumArgs, 2233 Canon); 2234 2235 Types.push_back(Spec); 2236 return QualType(Spec, 0); 2237} 2238 2239QualType 2240ASTContext::getCanonicalTemplateSpecializationType(TemplateName Template, 2241 const TemplateArgument *Args, 2242 unsigned NumArgs) const { 2243 // Build the canonical template specialization type. 2244 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 2245 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 2246 CanonArgs.reserve(NumArgs); 2247 for (unsigned I = 0; I != NumArgs; ++I) 2248 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 2249 2250 // Determine whether this canonical template specialization type already 2251 // exists. 2252 llvm::FoldingSetNodeID ID; 2253 TemplateSpecializationType::Profile(ID, CanonTemplate, 2254 CanonArgs.data(), NumArgs, *this); 2255 2256 void *InsertPos = 0; 2257 TemplateSpecializationType *Spec 2258 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2259 2260 if (!Spec) { 2261 // Allocate a new canonical template specialization type. 2262 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 2263 sizeof(TemplateArgument) * NumArgs), 2264 TypeAlignment); 2265 Spec = new (Mem) TemplateSpecializationType(CanonTemplate, 2266 CanonArgs.data(), NumArgs, 2267 QualType()); 2268 Types.push_back(Spec); 2269 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 2270 } 2271 2272 assert(Spec->isDependentType() && 2273 "Non-dependent template-id type must have a canonical type"); 2274 return QualType(Spec, 0); 2275} 2276 2277QualType 2278ASTContext::getElaboratedType(ElaboratedTypeKeyword Keyword, 2279 NestedNameSpecifier *NNS, 2280 QualType NamedType) const { 2281 llvm::FoldingSetNodeID ID; 2282 ElaboratedType::Profile(ID, Keyword, NNS, NamedType); 2283 2284 void *InsertPos = 0; 2285 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2286 if (T) 2287 return QualType(T, 0); 2288 2289 QualType Canon = NamedType; 2290 if (!Canon.isCanonical()) { 2291 Canon = getCanonicalType(NamedType); 2292 ElaboratedType *CheckT = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 2293 assert(!CheckT && "Elaborated canonical type broken"); 2294 (void)CheckT; 2295 } 2296 2297 T = new (*this) ElaboratedType(Keyword, NNS, NamedType, Canon); 2298 Types.push_back(T); 2299 ElaboratedTypes.InsertNode(T, InsertPos); 2300 return QualType(T, 0); 2301} 2302 2303QualType 2304ASTContext::getParenType(QualType InnerType) const { 2305 llvm::FoldingSetNodeID ID; 2306 ParenType::Profile(ID, InnerType); 2307 2308 void *InsertPos = 0; 2309 ParenType *T = ParenTypes.FindNodeOrInsertPos(ID, InsertPos); 2310 if (T) 2311 return QualType(T, 0); 2312 2313 QualType Canon = InnerType; 2314 if (!Canon.isCanonical()) { 2315 Canon = getCanonicalType(InnerType); 2316 ParenType *CheckT = ParenTypes.FindNodeOrInsertPos(ID, InsertPos); 2317 assert(!CheckT && "Paren canonical type broken"); 2318 (void)CheckT; 2319 } 2320 2321 T = new (*this) ParenType(InnerType, Canon); 2322 Types.push_back(T); 2323 ParenTypes.InsertNode(T, InsertPos); 2324 return QualType(T, 0); 2325} 2326 2327QualType ASTContext::getDependentNameType(ElaboratedTypeKeyword Keyword, 2328 NestedNameSpecifier *NNS, 2329 const IdentifierInfo *Name, 2330 QualType Canon) const { 2331 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 2332 2333 if (Canon.isNull()) { 2334 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2335 ElaboratedTypeKeyword CanonKeyword = Keyword; 2336 if (Keyword == ETK_None) 2337 CanonKeyword = ETK_Typename; 2338 2339 if (CanonNNS != NNS || CanonKeyword != Keyword) 2340 Canon = getDependentNameType(CanonKeyword, CanonNNS, Name); 2341 } 2342 2343 llvm::FoldingSetNodeID ID; 2344 DependentNameType::Profile(ID, Keyword, NNS, Name); 2345 2346 void *InsertPos = 0; 2347 DependentNameType *T 2348 = DependentNameTypes.FindNodeOrInsertPos(ID, InsertPos); 2349 if (T) 2350 return QualType(T, 0); 2351 2352 T = new (*this) DependentNameType(Keyword, NNS, Name, Canon); 2353 Types.push_back(T); 2354 DependentNameTypes.InsertNode(T, InsertPos); 2355 return QualType(T, 0); 2356} 2357 2358QualType 2359ASTContext::getDependentTemplateSpecializationType( 2360 ElaboratedTypeKeyword Keyword, 2361 NestedNameSpecifier *NNS, 2362 const IdentifierInfo *Name, 2363 const TemplateArgumentListInfo &Args) const { 2364 // TODO: avoid this copy 2365 llvm::SmallVector<TemplateArgument, 16> ArgCopy; 2366 for (unsigned I = 0, E = Args.size(); I != E; ++I) 2367 ArgCopy.push_back(Args[I].getArgument()); 2368 return getDependentTemplateSpecializationType(Keyword, NNS, Name, 2369 ArgCopy.size(), 2370 ArgCopy.data()); 2371} 2372 2373QualType 2374ASTContext::getDependentTemplateSpecializationType( 2375 ElaboratedTypeKeyword Keyword, 2376 NestedNameSpecifier *NNS, 2377 const IdentifierInfo *Name, 2378 unsigned NumArgs, 2379 const TemplateArgument *Args) const { 2380 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 2381 2382 llvm::FoldingSetNodeID ID; 2383 DependentTemplateSpecializationType::Profile(ID, *this, Keyword, NNS, 2384 Name, NumArgs, Args); 2385 2386 void *InsertPos = 0; 2387 DependentTemplateSpecializationType *T 2388 = DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2389 if (T) 2390 return QualType(T, 0); 2391 2392 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2393 2394 ElaboratedTypeKeyword CanonKeyword = Keyword; 2395 if (Keyword == ETK_None) CanonKeyword = ETK_Typename; 2396 2397 bool AnyNonCanonArgs = false; 2398 llvm::SmallVector<TemplateArgument, 16> CanonArgs(NumArgs); 2399 for (unsigned I = 0; I != NumArgs; ++I) { 2400 CanonArgs[I] = getCanonicalTemplateArgument(Args[I]); 2401 if (!CanonArgs[I].structurallyEquals(Args[I])) 2402 AnyNonCanonArgs = true; 2403 } 2404 2405 QualType Canon; 2406 if (AnyNonCanonArgs || CanonNNS != NNS || CanonKeyword != Keyword) { 2407 Canon = getDependentTemplateSpecializationType(CanonKeyword, CanonNNS, 2408 Name, NumArgs, 2409 CanonArgs.data()); 2410 2411 // Find the insert position again. 2412 DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2413 } 2414 2415 void *Mem = Allocate((sizeof(DependentTemplateSpecializationType) + 2416 sizeof(TemplateArgument) * NumArgs), 2417 TypeAlignment); 2418 T = new (Mem) DependentTemplateSpecializationType(Keyword, NNS, 2419 Name, NumArgs, Args, Canon); 2420 Types.push_back(T); 2421 DependentTemplateSpecializationTypes.InsertNode(T, InsertPos); 2422 return QualType(T, 0); 2423} 2424 2425QualType ASTContext::getPackExpansionType(QualType Pattern, 2426 llvm::Optional<unsigned> NumExpansions) { 2427 llvm::FoldingSetNodeID ID; 2428 PackExpansionType::Profile(ID, Pattern, NumExpansions); 2429 2430 assert(Pattern->containsUnexpandedParameterPack() && 2431 "Pack expansions must expand one or more parameter packs"); 2432 void *InsertPos = 0; 2433 PackExpansionType *T 2434 = PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2435 if (T) 2436 return QualType(T, 0); 2437 2438 QualType Canon; 2439 if (!Pattern.isCanonical()) { 2440 Canon = getPackExpansionType(getCanonicalType(Pattern), NumExpansions); 2441 2442 // Find the insert position again. 2443 PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2444 } 2445 2446 T = new (*this) PackExpansionType(Pattern, Canon, NumExpansions); 2447 Types.push_back(T); 2448 PackExpansionTypes.InsertNode(T, InsertPos); 2449 return QualType(T, 0); 2450} 2451 2452/// CmpProtocolNames - Comparison predicate for sorting protocols 2453/// alphabetically. 2454static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 2455 const ObjCProtocolDecl *RHS) { 2456 return LHS->getDeclName() < RHS->getDeclName(); 2457} 2458 2459static bool areSortedAndUniqued(ObjCProtocolDecl * const *Protocols, 2460 unsigned NumProtocols) { 2461 if (NumProtocols == 0) return true; 2462 2463 for (unsigned i = 1; i != NumProtocols; ++i) 2464 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 2465 return false; 2466 return true; 2467} 2468 2469static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2470 unsigned &NumProtocols) { 2471 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2472 2473 // Sort protocols, keyed by name. 2474 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2475 2476 // Remove duplicates. 2477 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2478 NumProtocols = ProtocolsEnd-Protocols; 2479} 2480 2481QualType ASTContext::getObjCObjectType(QualType BaseType, 2482 ObjCProtocolDecl * const *Protocols, 2483 unsigned NumProtocols) const { 2484 // If the base type is an interface and there aren't any protocols 2485 // to add, then the interface type will do just fine. 2486 if (!NumProtocols && isa<ObjCInterfaceType>(BaseType)) 2487 return BaseType; 2488 2489 // Look in the folding set for an existing type. 2490 llvm::FoldingSetNodeID ID; 2491 ObjCObjectTypeImpl::Profile(ID, BaseType, Protocols, NumProtocols); 2492 void *InsertPos = 0; 2493 if (ObjCObjectType *QT = ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos)) 2494 return QualType(QT, 0); 2495 2496 // Build the canonical type, which has the canonical base type and 2497 // a sorted-and-uniqued list of protocols. 2498 QualType Canonical; 2499 bool ProtocolsSorted = areSortedAndUniqued(Protocols, NumProtocols); 2500 if (!ProtocolsSorted || !BaseType.isCanonical()) { 2501 if (!ProtocolsSorted) { 2502 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(Protocols, 2503 Protocols + NumProtocols); 2504 unsigned UniqueCount = NumProtocols; 2505 2506 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2507 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2508 &Sorted[0], UniqueCount); 2509 } else { 2510 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2511 Protocols, NumProtocols); 2512 } 2513 2514 // Regenerate InsertPos. 2515 ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos); 2516 } 2517 2518 unsigned Size = sizeof(ObjCObjectTypeImpl); 2519 Size += NumProtocols * sizeof(ObjCProtocolDecl *); 2520 void *Mem = Allocate(Size, TypeAlignment); 2521 ObjCObjectTypeImpl *T = 2522 new (Mem) ObjCObjectTypeImpl(Canonical, BaseType, Protocols, NumProtocols); 2523 2524 Types.push_back(T); 2525 ObjCObjectTypes.InsertNode(T, InsertPos); 2526 return QualType(T, 0); 2527} 2528 2529/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2530/// the given object type. 2531QualType ASTContext::getObjCObjectPointerType(QualType ObjectT) const { 2532 llvm::FoldingSetNodeID ID; 2533 ObjCObjectPointerType::Profile(ID, ObjectT); 2534 2535 void *InsertPos = 0; 2536 if (ObjCObjectPointerType *QT = 2537 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2538 return QualType(QT, 0); 2539 2540 // Find the canonical object type. 2541 QualType Canonical; 2542 if (!ObjectT.isCanonical()) { 2543 Canonical = getObjCObjectPointerType(getCanonicalType(ObjectT)); 2544 2545 // Regenerate InsertPos. 2546 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2547 } 2548 2549 // No match. 2550 void *Mem = Allocate(sizeof(ObjCObjectPointerType), TypeAlignment); 2551 ObjCObjectPointerType *QType = 2552 new (Mem) ObjCObjectPointerType(Canonical, ObjectT); 2553 2554 Types.push_back(QType); 2555 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2556 return QualType(QType, 0); 2557} 2558 2559/// getObjCInterfaceType - Return the unique reference to the type for the 2560/// specified ObjC interface decl. The list of protocols is optional. 2561QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) const { 2562 if (Decl->TypeForDecl) 2563 return QualType(Decl->TypeForDecl, 0); 2564 2565 // FIXME: redeclarations? 2566 void *Mem = Allocate(sizeof(ObjCInterfaceType), TypeAlignment); 2567 ObjCInterfaceType *T = new (Mem) ObjCInterfaceType(Decl); 2568 Decl->TypeForDecl = T; 2569 Types.push_back(T); 2570 return QualType(T, 0); 2571} 2572 2573/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2574/// TypeOfExprType AST's (since expression's are never shared). For example, 2575/// multiple declarations that refer to "typeof(x)" all contain different 2576/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2577/// on canonical type's (which are always unique). 2578QualType ASTContext::getTypeOfExprType(Expr *tofExpr) const { 2579 TypeOfExprType *toe; 2580 if (tofExpr->isTypeDependent()) { 2581 llvm::FoldingSetNodeID ID; 2582 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2583 2584 void *InsertPos = 0; 2585 DependentTypeOfExprType *Canon 2586 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2587 if (Canon) { 2588 // We already have a "canonical" version of an identical, dependent 2589 // typeof(expr) type. Use that as our canonical type. 2590 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2591 QualType((TypeOfExprType*)Canon, 0)); 2592 } 2593 else { 2594 // Build a new, canonical typeof(expr) type. 2595 Canon 2596 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2597 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2598 toe = Canon; 2599 } 2600 } else { 2601 QualType Canonical = getCanonicalType(tofExpr->getType()); 2602 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2603 } 2604 Types.push_back(toe); 2605 return QualType(toe, 0); 2606} 2607 2608/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2609/// TypeOfType AST's. The only motivation to unique these nodes would be 2610/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2611/// an issue. This doesn't effect the type checker, since it operates 2612/// on canonical type's (which are always unique). 2613QualType ASTContext::getTypeOfType(QualType tofType) const { 2614 QualType Canonical = getCanonicalType(tofType); 2615 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2616 Types.push_back(tot); 2617 return QualType(tot, 0); 2618} 2619 2620/// getDecltypeForExpr - Given an expr, will return the decltype for that 2621/// expression, according to the rules in C++0x [dcl.type.simple]p4 2622static QualType getDecltypeForExpr(const Expr *e, const ASTContext &Context) { 2623 if (e->isTypeDependent()) 2624 return Context.DependentTy; 2625 2626 // If e is an id expression or a class member access, decltype(e) is defined 2627 // as the type of the entity named by e. 2628 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2629 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2630 return VD->getType(); 2631 } 2632 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2633 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2634 return FD->getType(); 2635 } 2636 // If e is a function call or an invocation of an overloaded operator, 2637 // (parentheses around e are ignored), decltype(e) is defined as the 2638 // return type of that function. 2639 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2640 return CE->getCallReturnType(); 2641 2642 QualType T = e->getType(); 2643 2644 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2645 // defined as T&, otherwise decltype(e) is defined as T. 2646 if (e->isLValue()) 2647 T = Context.getLValueReferenceType(T); 2648 2649 return T; 2650} 2651 2652/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2653/// DecltypeType AST's. The only motivation to unique these nodes would be 2654/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2655/// an issue. This doesn't effect the type checker, since it operates 2656/// on canonical type's (which are always unique). 2657QualType ASTContext::getDecltypeType(Expr *e) const { 2658 DecltypeType *dt; 2659 if (e->isTypeDependent()) { 2660 llvm::FoldingSetNodeID ID; 2661 DependentDecltypeType::Profile(ID, *this, e); 2662 2663 void *InsertPos = 0; 2664 DependentDecltypeType *Canon 2665 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2666 if (Canon) { 2667 // We already have a "canonical" version of an equivalent, dependent 2668 // decltype type. Use that as our canonical type. 2669 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2670 QualType((DecltypeType*)Canon, 0)); 2671 } 2672 else { 2673 // Build a new, canonical typeof(expr) type. 2674 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2675 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2676 dt = Canon; 2677 } 2678 } else { 2679 QualType T = getDecltypeForExpr(e, *this); 2680 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2681 } 2682 Types.push_back(dt); 2683 return QualType(dt, 0); 2684} 2685 2686/// getAutoType - We only unique auto types after they've been deduced. 2687QualType ASTContext::getAutoType(QualType DeducedType) const { 2688 void *InsertPos = 0; 2689 if (!DeducedType.isNull()) { 2690 // Look in the folding set for an existing type. 2691 llvm::FoldingSetNodeID ID; 2692 AutoType::Profile(ID, DeducedType); 2693 if (AutoType *AT = AutoTypes.FindNodeOrInsertPos(ID, InsertPos)) 2694 return QualType(AT, 0); 2695 } 2696 2697 AutoType *AT = new (*this, TypeAlignment) AutoType(DeducedType); 2698 Types.push_back(AT); 2699 if (InsertPos) 2700 AutoTypes.InsertNode(AT, InsertPos); 2701 return QualType(AT, 0); 2702} 2703 2704/// getTagDeclType - Return the unique reference to the type for the 2705/// specified TagDecl (struct/union/class/enum) decl. 2706QualType ASTContext::getTagDeclType(const TagDecl *Decl) const { 2707 assert (Decl); 2708 // FIXME: What is the design on getTagDeclType when it requires casting 2709 // away const? mutable? 2710 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2711} 2712 2713/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2714/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2715/// needs to agree with the definition in <stddef.h>. 2716CanQualType ASTContext::getSizeType() const { 2717 return getFromTargetType(Target.getSizeType()); 2718} 2719 2720/// getSignedWCharType - Return the type of "signed wchar_t". 2721/// Used when in C++, as a GCC extension. 2722QualType ASTContext::getSignedWCharType() const { 2723 // FIXME: derive from "Target" ? 2724 return WCharTy; 2725} 2726 2727/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2728/// Used when in C++, as a GCC extension. 2729QualType ASTContext::getUnsignedWCharType() const { 2730 // FIXME: derive from "Target" ? 2731 return UnsignedIntTy; 2732} 2733 2734/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2735/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2736QualType ASTContext::getPointerDiffType() const { 2737 return getFromTargetType(Target.getPtrDiffType(0)); 2738} 2739 2740//===----------------------------------------------------------------------===// 2741// Type Operators 2742//===----------------------------------------------------------------------===// 2743 2744CanQualType ASTContext::getCanonicalParamType(QualType T) const { 2745 // Push qualifiers into arrays, and then discard any remaining 2746 // qualifiers. 2747 T = getCanonicalType(T); 2748 T = getVariableArrayDecayedType(T); 2749 const Type *Ty = T.getTypePtr(); 2750 QualType Result; 2751 if (isa<ArrayType>(Ty)) { 2752 Result = getArrayDecayedType(QualType(Ty,0)); 2753 } else if (isa<FunctionType>(Ty)) { 2754 Result = getPointerType(QualType(Ty, 0)); 2755 } else { 2756 Result = QualType(Ty, 0); 2757 } 2758 2759 return CanQualType::CreateUnsafe(Result); 2760} 2761 2762 2763QualType ASTContext::getUnqualifiedArrayType(QualType type, 2764 Qualifiers &quals) { 2765 SplitQualType splitType = type.getSplitUnqualifiedType(); 2766 2767 // FIXME: getSplitUnqualifiedType() actually walks all the way to 2768 // the unqualified desugared type and then drops it on the floor. 2769 // We then have to strip that sugar back off with 2770 // getUnqualifiedDesugaredType(), which is silly. 2771 const ArrayType *AT = 2772 dyn_cast<ArrayType>(splitType.first->getUnqualifiedDesugaredType()); 2773 2774 // If we don't have an array, just use the results in splitType. 2775 if (!AT) { 2776 quals = splitType.second; 2777 return QualType(splitType.first, 0); 2778 } 2779 2780 // Otherwise, recurse on the array's element type. 2781 QualType elementType = AT->getElementType(); 2782 QualType unqualElementType = getUnqualifiedArrayType(elementType, quals); 2783 2784 // If that didn't change the element type, AT has no qualifiers, so we 2785 // can just use the results in splitType. 2786 if (elementType == unqualElementType) { 2787 assert(quals.empty()); // from the recursive call 2788 quals = splitType.second; 2789 return QualType(splitType.first, 0); 2790 } 2791 2792 // Otherwise, add in the qualifiers from the outermost type, then 2793 // build the type back up. 2794 quals.addConsistentQualifiers(splitType.second); 2795 2796 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) { 2797 return getConstantArrayType(unqualElementType, CAT->getSize(), 2798 CAT->getSizeModifier(), 0); 2799 } 2800 2801 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 2802 return getIncompleteArrayType(unqualElementType, IAT->getSizeModifier(), 0); 2803 } 2804 2805 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(AT)) { 2806 return getVariableArrayType(unqualElementType, 2807 VAT->getSizeExpr(), 2808 VAT->getSizeModifier(), 2809 VAT->getIndexTypeCVRQualifiers(), 2810 VAT->getBracketsRange()); 2811 } 2812 2813 const DependentSizedArrayType *DSAT = cast<DependentSizedArrayType>(AT); 2814 return getDependentSizedArrayType(unqualElementType, DSAT->getSizeExpr(), 2815 DSAT->getSizeModifier(), 0, 2816 SourceRange()); 2817} 2818 2819/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 2820/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 2821/// they point to and return true. If T1 and T2 aren't pointer types 2822/// or pointer-to-member types, or if they are not similar at this 2823/// level, returns false and leaves T1 and T2 unchanged. Top-level 2824/// qualifiers on T1 and T2 are ignored. This function will typically 2825/// be called in a loop that successively "unwraps" pointer and 2826/// pointer-to-member types to compare them at each level. 2827bool ASTContext::UnwrapSimilarPointerTypes(QualType &T1, QualType &T2) { 2828 const PointerType *T1PtrType = T1->getAs<PointerType>(), 2829 *T2PtrType = T2->getAs<PointerType>(); 2830 if (T1PtrType && T2PtrType) { 2831 T1 = T1PtrType->getPointeeType(); 2832 T2 = T2PtrType->getPointeeType(); 2833 return true; 2834 } 2835 2836 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 2837 *T2MPType = T2->getAs<MemberPointerType>(); 2838 if (T1MPType && T2MPType && 2839 hasSameUnqualifiedType(QualType(T1MPType->getClass(), 0), 2840 QualType(T2MPType->getClass(), 0))) { 2841 T1 = T1MPType->getPointeeType(); 2842 T2 = T2MPType->getPointeeType(); 2843 return true; 2844 } 2845 2846 if (getLangOptions().ObjC1) { 2847 const ObjCObjectPointerType *T1OPType = T1->getAs<ObjCObjectPointerType>(), 2848 *T2OPType = T2->getAs<ObjCObjectPointerType>(); 2849 if (T1OPType && T2OPType) { 2850 T1 = T1OPType->getPointeeType(); 2851 T2 = T2OPType->getPointeeType(); 2852 return true; 2853 } 2854 } 2855 2856 // FIXME: Block pointers, too? 2857 2858 return false; 2859} 2860 2861DeclarationNameInfo 2862ASTContext::getNameForTemplate(TemplateName Name, 2863 SourceLocation NameLoc) const { 2864 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2865 // DNInfo work in progress: CHECKME: what about DNLoc? 2866 return DeclarationNameInfo(TD->getDeclName(), NameLoc); 2867 2868 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2869 DeclarationName DName; 2870 if (DTN->isIdentifier()) { 2871 DName = DeclarationNames.getIdentifier(DTN->getIdentifier()); 2872 return DeclarationNameInfo(DName, NameLoc); 2873 } else { 2874 DName = DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2875 // DNInfo work in progress: FIXME: source locations? 2876 DeclarationNameLoc DNLoc; 2877 DNLoc.CXXOperatorName.BeginOpNameLoc = SourceLocation().getRawEncoding(); 2878 DNLoc.CXXOperatorName.EndOpNameLoc = SourceLocation().getRawEncoding(); 2879 return DeclarationNameInfo(DName, NameLoc, DNLoc); 2880 } 2881 } 2882 2883 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2884 assert(Storage); 2885 // DNInfo work in progress: CHECKME: what about DNLoc? 2886 return DeclarationNameInfo((*Storage->begin())->getDeclName(), NameLoc); 2887} 2888 2889TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) const { 2890 if (TemplateDecl *Template = Name.getAsTemplateDecl()) { 2891 if (TemplateTemplateParmDecl *TTP 2892 = dyn_cast<TemplateTemplateParmDecl>(Template)) 2893 Template = getCanonicalTemplateTemplateParmDecl(TTP); 2894 2895 // The canonical template name is the canonical template declaration. 2896 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2897 } 2898 2899 if (SubstTemplateTemplateParmPackStorage *SubstPack 2900 = Name.getAsSubstTemplateTemplateParmPack()) { 2901 TemplateTemplateParmDecl *CanonParam 2902 = getCanonicalTemplateTemplateParmDecl(SubstPack->getParameterPack()); 2903 TemplateArgument CanonArgPack 2904 = getCanonicalTemplateArgument(SubstPack->getArgumentPack()); 2905 return getSubstTemplateTemplateParmPack(CanonParam, CanonArgPack); 2906 } 2907 2908 assert(!Name.getAsOverloadedTemplate()); 2909 2910 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2911 assert(DTN && "Non-dependent template names must refer to template decls."); 2912 return DTN->CanonicalTemplateName; 2913} 2914 2915bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2916 X = getCanonicalTemplateName(X); 2917 Y = getCanonicalTemplateName(Y); 2918 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2919} 2920 2921TemplateArgument 2922ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) const { 2923 switch (Arg.getKind()) { 2924 case TemplateArgument::Null: 2925 return Arg; 2926 2927 case TemplateArgument::Expression: 2928 return Arg; 2929 2930 case TemplateArgument::Declaration: 2931 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2932 2933 case TemplateArgument::Template: 2934 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2935 2936 case TemplateArgument::TemplateExpansion: 2937 return TemplateArgument(getCanonicalTemplateName( 2938 Arg.getAsTemplateOrTemplatePattern()), 2939 Arg.getNumTemplateExpansions()); 2940 2941 case TemplateArgument::Integral: 2942 return TemplateArgument(*Arg.getAsIntegral(), 2943 getCanonicalType(Arg.getIntegralType())); 2944 2945 case TemplateArgument::Type: 2946 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2947 2948 case TemplateArgument::Pack: { 2949 if (Arg.pack_size() == 0) 2950 return Arg; 2951 2952 TemplateArgument *CanonArgs 2953 = new (*this) TemplateArgument[Arg.pack_size()]; 2954 unsigned Idx = 0; 2955 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2956 AEnd = Arg.pack_end(); 2957 A != AEnd; (void)++A, ++Idx) 2958 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2959 2960 return TemplateArgument(CanonArgs, Arg.pack_size()); 2961 } 2962 } 2963 2964 // Silence GCC warning 2965 assert(false && "Unhandled template argument kind"); 2966 return TemplateArgument(); 2967} 2968 2969NestedNameSpecifier * 2970ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) const { 2971 if (!NNS) 2972 return 0; 2973 2974 switch (NNS->getKind()) { 2975 case NestedNameSpecifier::Identifier: 2976 // Canonicalize the prefix but keep the identifier the same. 2977 return NestedNameSpecifier::Create(*this, 2978 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2979 NNS->getAsIdentifier()); 2980 2981 case NestedNameSpecifier::Namespace: 2982 // A namespace is canonical; build a nested-name-specifier with 2983 // this namespace and no prefix. 2984 return NestedNameSpecifier::Create(*this, 0, 2985 NNS->getAsNamespace()->getOriginalNamespace()); 2986 2987 case NestedNameSpecifier::NamespaceAlias: 2988 // A namespace is canonical; build a nested-name-specifier with 2989 // this namespace and no prefix. 2990 return NestedNameSpecifier::Create(*this, 0, 2991 NNS->getAsNamespaceAlias()->getNamespace() 2992 ->getOriginalNamespace()); 2993 2994 case NestedNameSpecifier::TypeSpec: 2995 case NestedNameSpecifier::TypeSpecWithTemplate: { 2996 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2997 2998 // If we have some kind of dependent-named type (e.g., "typename T::type"), 2999 // break it apart into its prefix and identifier, then reconsititute those 3000 // as the canonical nested-name-specifier. This is required to canonicalize 3001 // a dependent nested-name-specifier involving typedefs of dependent-name 3002 // types, e.g., 3003 // typedef typename T::type T1; 3004 // typedef typename T1::type T2; 3005 if (const DependentNameType *DNT = T->getAs<DependentNameType>()) { 3006 NestedNameSpecifier *Prefix 3007 = getCanonicalNestedNameSpecifier(DNT->getQualifier()); 3008 return NestedNameSpecifier::Create(*this, Prefix, 3009 const_cast<IdentifierInfo *>(DNT->getIdentifier())); 3010 } 3011 3012 // Do the same thing as above, but with dependent-named specializations. 3013 if (const DependentTemplateSpecializationType *DTST 3014 = T->getAs<DependentTemplateSpecializationType>()) { 3015 NestedNameSpecifier *Prefix 3016 = getCanonicalNestedNameSpecifier(DTST->getQualifier()); 3017 TemplateName Name 3018 = getDependentTemplateName(Prefix, DTST->getIdentifier()); 3019 T = getTemplateSpecializationType(Name, 3020 DTST->getArgs(), DTST->getNumArgs()); 3021 T = getCanonicalType(T); 3022 } 3023 3024 return NestedNameSpecifier::Create(*this, 0, false, 3025 const_cast<Type*>(T.getTypePtr())); 3026 } 3027 3028 case NestedNameSpecifier::Global: 3029 // The global specifier is canonical and unique. 3030 return NNS; 3031 } 3032 3033 // Required to silence a GCC warning 3034 return 0; 3035} 3036 3037 3038const ArrayType *ASTContext::getAsArrayType(QualType T) const { 3039 // Handle the non-qualified case efficiently. 3040 if (!T.hasLocalQualifiers()) { 3041 // Handle the common positive case fast. 3042 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 3043 return AT; 3044 } 3045 3046 // Handle the common negative case fast. 3047 if (!isa<ArrayType>(T.getCanonicalType())) 3048 return 0; 3049 3050 // Apply any qualifiers from the array type to the element type. This 3051 // implements C99 6.7.3p8: "If the specification of an array type includes 3052 // any type qualifiers, the element type is so qualified, not the array type." 3053 3054 // If we get here, we either have type qualifiers on the type, or we have 3055 // sugar such as a typedef in the way. If we have type qualifiers on the type 3056 // we must propagate them down into the element type. 3057 3058 SplitQualType split = T.getSplitDesugaredType(); 3059 Qualifiers qs = split.second; 3060 3061 // If we have a simple case, just return now. 3062 const ArrayType *ATy = dyn_cast<ArrayType>(split.first); 3063 if (ATy == 0 || qs.empty()) 3064 return ATy; 3065 3066 // Otherwise, we have an array and we have qualifiers on it. Push the 3067 // qualifiers into the array element type and return a new array type. 3068 QualType NewEltTy = getQualifiedType(ATy->getElementType(), qs); 3069 3070 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 3071 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 3072 CAT->getSizeModifier(), 3073 CAT->getIndexTypeCVRQualifiers())); 3074 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 3075 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 3076 IAT->getSizeModifier(), 3077 IAT->getIndexTypeCVRQualifiers())); 3078 3079 if (const DependentSizedArrayType *DSAT 3080 = dyn_cast<DependentSizedArrayType>(ATy)) 3081 return cast<ArrayType>( 3082 getDependentSizedArrayType(NewEltTy, 3083 DSAT->getSizeExpr(), 3084 DSAT->getSizeModifier(), 3085 DSAT->getIndexTypeCVRQualifiers(), 3086 DSAT->getBracketsRange())); 3087 3088 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 3089 return cast<ArrayType>(getVariableArrayType(NewEltTy, 3090 VAT->getSizeExpr(), 3091 VAT->getSizeModifier(), 3092 VAT->getIndexTypeCVRQualifiers(), 3093 VAT->getBracketsRange())); 3094} 3095 3096/// getArrayDecayedType - Return the properly qualified result of decaying the 3097/// specified array type to a pointer. This operation is non-trivial when 3098/// handling typedefs etc. The canonical type of "T" must be an array type, 3099/// this returns a pointer to a properly qualified element of the array. 3100/// 3101/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 3102QualType ASTContext::getArrayDecayedType(QualType Ty) const { 3103 // Get the element type with 'getAsArrayType' so that we don't lose any 3104 // typedefs in the element type of the array. This also handles propagation 3105 // of type qualifiers from the array type into the element type if present 3106 // (C99 6.7.3p8). 3107 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 3108 assert(PrettyArrayType && "Not an array type!"); 3109 3110 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 3111 3112 // int x[restrict 4] -> int *restrict 3113 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 3114} 3115 3116QualType ASTContext::getBaseElementType(const ArrayType *array) const { 3117 return getBaseElementType(array->getElementType()); 3118} 3119 3120QualType ASTContext::getBaseElementType(QualType type) const { 3121 Qualifiers qs; 3122 while (true) { 3123 SplitQualType split = type.getSplitDesugaredType(); 3124 const ArrayType *array = split.first->getAsArrayTypeUnsafe(); 3125 if (!array) break; 3126 3127 type = array->getElementType(); 3128 qs.addConsistentQualifiers(split.second); 3129 } 3130 3131 return getQualifiedType(type, qs); 3132} 3133 3134/// getConstantArrayElementCount - Returns number of constant array elements. 3135uint64_t 3136ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 3137 uint64_t ElementCount = 1; 3138 do { 3139 ElementCount *= CA->getSize().getZExtValue(); 3140 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 3141 } while (CA); 3142 return ElementCount; 3143} 3144 3145/// getFloatingRank - Return a relative rank for floating point types. 3146/// This routine will assert if passed a built-in type that isn't a float. 3147static FloatingRank getFloatingRank(QualType T) { 3148 if (const ComplexType *CT = T->getAs<ComplexType>()) 3149 return getFloatingRank(CT->getElementType()); 3150 3151 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 3152 switch (T->getAs<BuiltinType>()->getKind()) { 3153 default: assert(0 && "getFloatingRank(): not a floating type"); 3154 case BuiltinType::Float: return FloatRank; 3155 case BuiltinType::Double: return DoubleRank; 3156 case BuiltinType::LongDouble: return LongDoubleRank; 3157 } 3158} 3159 3160/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 3161/// point or a complex type (based on typeDomain/typeSize). 3162/// 'typeDomain' is a real floating point or complex type. 3163/// 'typeSize' is a real floating point or complex type. 3164QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 3165 QualType Domain) const { 3166 FloatingRank EltRank = getFloatingRank(Size); 3167 if (Domain->isComplexType()) { 3168 switch (EltRank) { 3169 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3170 case FloatRank: return FloatComplexTy; 3171 case DoubleRank: return DoubleComplexTy; 3172 case LongDoubleRank: return LongDoubleComplexTy; 3173 } 3174 } 3175 3176 assert(Domain->isRealFloatingType() && "Unknown domain!"); 3177 switch (EltRank) { 3178 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3179 case FloatRank: return FloatTy; 3180 case DoubleRank: return DoubleTy; 3181 case LongDoubleRank: return LongDoubleTy; 3182 } 3183} 3184 3185/// getFloatingTypeOrder - Compare the rank of the two specified floating 3186/// point types, ignoring the domain of the type (i.e. 'double' == 3187/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 3188/// LHS < RHS, return -1. 3189int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) const { 3190 FloatingRank LHSR = getFloatingRank(LHS); 3191 FloatingRank RHSR = getFloatingRank(RHS); 3192 3193 if (LHSR == RHSR) 3194 return 0; 3195 if (LHSR > RHSR) 3196 return 1; 3197 return -1; 3198} 3199 3200/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 3201/// routine will assert if passed a built-in type that isn't an integer or enum, 3202/// or if it is not canonicalized. 3203unsigned ASTContext::getIntegerRank(const Type *T) const { 3204 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 3205 if (const EnumType* ET = dyn_cast<EnumType>(T)) 3206 T = ET->getDecl()->getPromotionType().getTypePtr(); 3207 3208 if (T->isSpecificBuiltinType(BuiltinType::WChar_S) || 3209 T->isSpecificBuiltinType(BuiltinType::WChar_U)) 3210 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 3211 3212 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 3213 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 3214 3215 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 3216 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 3217 3218 switch (cast<BuiltinType>(T)->getKind()) { 3219 default: assert(0 && "getIntegerRank(): not a built-in integer"); 3220 case BuiltinType::Bool: 3221 return 1 + (getIntWidth(BoolTy) << 3); 3222 case BuiltinType::Char_S: 3223 case BuiltinType::Char_U: 3224 case BuiltinType::SChar: 3225 case BuiltinType::UChar: 3226 return 2 + (getIntWidth(CharTy) << 3); 3227 case BuiltinType::Short: 3228 case BuiltinType::UShort: 3229 return 3 + (getIntWidth(ShortTy) << 3); 3230 case BuiltinType::Int: 3231 case BuiltinType::UInt: 3232 return 4 + (getIntWidth(IntTy) << 3); 3233 case BuiltinType::Long: 3234 case BuiltinType::ULong: 3235 return 5 + (getIntWidth(LongTy) << 3); 3236 case BuiltinType::LongLong: 3237 case BuiltinType::ULongLong: 3238 return 6 + (getIntWidth(LongLongTy) << 3); 3239 case BuiltinType::Int128: 3240 case BuiltinType::UInt128: 3241 return 7 + (getIntWidth(Int128Ty) << 3); 3242 } 3243} 3244 3245/// \brief Whether this is a promotable bitfield reference according 3246/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 3247/// 3248/// \returns the type this bit-field will promote to, or NULL if no 3249/// promotion occurs. 3250QualType ASTContext::isPromotableBitField(Expr *E) const { 3251 if (E->isTypeDependent() || E->isValueDependent()) 3252 return QualType(); 3253 3254 FieldDecl *Field = E->getBitField(); 3255 if (!Field) 3256 return QualType(); 3257 3258 QualType FT = Field->getType(); 3259 3260 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 3261 uint64_t BitWidth = BitWidthAP.getZExtValue(); 3262 uint64_t IntSize = getTypeSize(IntTy); 3263 // GCC extension compatibility: if the bit-field size is less than or equal 3264 // to the size of int, it gets promoted no matter what its type is. 3265 // For instance, unsigned long bf : 4 gets promoted to signed int. 3266 if (BitWidth < IntSize) 3267 return IntTy; 3268 3269 if (BitWidth == IntSize) 3270 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 3271 3272 // Types bigger than int are not subject to promotions, and therefore act 3273 // like the base type. 3274 // FIXME: This doesn't quite match what gcc does, but what gcc does here 3275 // is ridiculous. 3276 return QualType(); 3277} 3278 3279/// getPromotedIntegerType - Returns the type that Promotable will 3280/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 3281/// integer type. 3282QualType ASTContext::getPromotedIntegerType(QualType Promotable) const { 3283 assert(!Promotable.isNull()); 3284 assert(Promotable->isPromotableIntegerType()); 3285 if (const EnumType *ET = Promotable->getAs<EnumType>()) 3286 return ET->getDecl()->getPromotionType(); 3287 if (Promotable->isSignedIntegerType()) 3288 return IntTy; 3289 uint64_t PromotableSize = getTypeSize(Promotable); 3290 uint64_t IntSize = getTypeSize(IntTy); 3291 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 3292 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 3293} 3294 3295/// getIntegerTypeOrder - Returns the highest ranked integer type: 3296/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 3297/// LHS < RHS, return -1. 3298int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) const { 3299 const Type *LHSC = getCanonicalType(LHS).getTypePtr(); 3300 const Type *RHSC = getCanonicalType(RHS).getTypePtr(); 3301 if (LHSC == RHSC) return 0; 3302 3303 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 3304 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 3305 3306 unsigned LHSRank = getIntegerRank(LHSC); 3307 unsigned RHSRank = getIntegerRank(RHSC); 3308 3309 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 3310 if (LHSRank == RHSRank) return 0; 3311 return LHSRank > RHSRank ? 1 : -1; 3312 } 3313 3314 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 3315 if (LHSUnsigned) { 3316 // If the unsigned [LHS] type is larger, return it. 3317 if (LHSRank >= RHSRank) 3318 return 1; 3319 3320 // If the signed type can represent all values of the unsigned type, it 3321 // wins. Because we are dealing with 2's complement and types that are 3322 // powers of two larger than each other, this is always safe. 3323 return -1; 3324 } 3325 3326 // If the unsigned [RHS] type is larger, return it. 3327 if (RHSRank >= LHSRank) 3328 return -1; 3329 3330 // If the signed type can represent all values of the unsigned type, it 3331 // wins. Because we are dealing with 2's complement and types that are 3332 // powers of two larger than each other, this is always safe. 3333 return 1; 3334} 3335 3336static RecordDecl * 3337CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 3338 SourceLocation L, IdentifierInfo *Id) { 3339 if (Ctx.getLangOptions().CPlusPlus) 3340 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 3341 else 3342 return RecordDecl::Create(Ctx, TK, DC, L, Id); 3343} 3344 3345// getCFConstantStringType - Return the type used for constant CFStrings. 3346QualType ASTContext::getCFConstantStringType() const { 3347 if (!CFConstantStringTypeDecl) { 3348 CFConstantStringTypeDecl = 3349 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3350 &Idents.get("NSConstantString")); 3351 CFConstantStringTypeDecl->startDefinition(); 3352 3353 QualType FieldTypes[4]; 3354 3355 // const int *isa; 3356 FieldTypes[0] = getPointerType(IntTy.withConst()); 3357 // int flags; 3358 FieldTypes[1] = IntTy; 3359 // const char *str; 3360 FieldTypes[2] = getPointerType(CharTy.withConst()); 3361 // long length; 3362 FieldTypes[3] = LongTy; 3363 3364 // Create fields 3365 for (unsigned i = 0; i < 4; ++i) { 3366 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 3367 SourceLocation(), 0, 3368 FieldTypes[i], /*TInfo=*/0, 3369 /*BitWidth=*/0, 3370 /*Mutable=*/false); 3371 Field->setAccess(AS_public); 3372 CFConstantStringTypeDecl->addDecl(Field); 3373 } 3374 3375 CFConstantStringTypeDecl->completeDefinition(); 3376 } 3377 3378 return getTagDeclType(CFConstantStringTypeDecl); 3379} 3380 3381void ASTContext::setCFConstantStringType(QualType T) { 3382 const RecordType *Rec = T->getAs<RecordType>(); 3383 assert(Rec && "Invalid CFConstantStringType"); 3384 CFConstantStringTypeDecl = Rec->getDecl(); 3385} 3386 3387// getNSConstantStringType - Return the type used for constant NSStrings. 3388QualType ASTContext::getNSConstantStringType() const { 3389 if (!NSConstantStringTypeDecl) { 3390 NSConstantStringTypeDecl = 3391 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3392 &Idents.get("__builtin_NSString")); 3393 NSConstantStringTypeDecl->startDefinition(); 3394 3395 QualType FieldTypes[3]; 3396 3397 // const int *isa; 3398 FieldTypes[0] = getPointerType(IntTy.withConst()); 3399 // const char *str; 3400 FieldTypes[1] = getPointerType(CharTy.withConst()); 3401 // unsigned int length; 3402 FieldTypes[2] = UnsignedIntTy; 3403 3404 // Create fields 3405 for (unsigned i = 0; i < 3; ++i) { 3406 FieldDecl *Field = FieldDecl::Create(*this, NSConstantStringTypeDecl, 3407 SourceLocation(), 0, 3408 FieldTypes[i], /*TInfo=*/0, 3409 /*BitWidth=*/0, 3410 /*Mutable=*/false); 3411 Field->setAccess(AS_public); 3412 NSConstantStringTypeDecl->addDecl(Field); 3413 } 3414 3415 NSConstantStringTypeDecl->completeDefinition(); 3416 } 3417 3418 return getTagDeclType(NSConstantStringTypeDecl); 3419} 3420 3421void ASTContext::setNSConstantStringType(QualType T) { 3422 const RecordType *Rec = T->getAs<RecordType>(); 3423 assert(Rec && "Invalid NSConstantStringType"); 3424 NSConstantStringTypeDecl = Rec->getDecl(); 3425} 3426 3427QualType ASTContext::getObjCFastEnumerationStateType() const { 3428 if (!ObjCFastEnumerationStateTypeDecl) { 3429 ObjCFastEnumerationStateTypeDecl = 3430 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3431 &Idents.get("__objcFastEnumerationState")); 3432 ObjCFastEnumerationStateTypeDecl->startDefinition(); 3433 3434 QualType FieldTypes[] = { 3435 UnsignedLongTy, 3436 getPointerType(ObjCIdTypedefType), 3437 getPointerType(UnsignedLongTy), 3438 getConstantArrayType(UnsignedLongTy, 3439 llvm::APInt(32, 5), ArrayType::Normal, 0) 3440 }; 3441 3442 for (size_t i = 0; i < 4; ++i) { 3443 FieldDecl *Field = FieldDecl::Create(*this, 3444 ObjCFastEnumerationStateTypeDecl, 3445 SourceLocation(), 0, 3446 FieldTypes[i], /*TInfo=*/0, 3447 /*BitWidth=*/0, 3448 /*Mutable=*/false); 3449 Field->setAccess(AS_public); 3450 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 3451 } 3452 3453 ObjCFastEnumerationStateTypeDecl->completeDefinition(); 3454 } 3455 3456 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 3457} 3458 3459QualType ASTContext::getBlockDescriptorType() const { 3460 if (BlockDescriptorType) 3461 return getTagDeclType(BlockDescriptorType); 3462 3463 RecordDecl *T; 3464 // FIXME: Needs the FlagAppleBlock bit. 3465 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3466 &Idents.get("__block_descriptor")); 3467 T->startDefinition(); 3468 3469 QualType FieldTypes[] = { 3470 UnsignedLongTy, 3471 UnsignedLongTy, 3472 }; 3473 3474 const char *FieldNames[] = { 3475 "reserved", 3476 "Size" 3477 }; 3478 3479 for (size_t i = 0; i < 2; ++i) { 3480 FieldDecl *Field = FieldDecl::Create(*this, 3481 T, 3482 SourceLocation(), 3483 &Idents.get(FieldNames[i]), 3484 FieldTypes[i], /*TInfo=*/0, 3485 /*BitWidth=*/0, 3486 /*Mutable=*/false); 3487 Field->setAccess(AS_public); 3488 T->addDecl(Field); 3489 } 3490 3491 T->completeDefinition(); 3492 3493 BlockDescriptorType = T; 3494 3495 return getTagDeclType(BlockDescriptorType); 3496} 3497 3498void ASTContext::setBlockDescriptorType(QualType T) { 3499 const RecordType *Rec = T->getAs<RecordType>(); 3500 assert(Rec && "Invalid BlockDescriptorType"); 3501 BlockDescriptorType = Rec->getDecl(); 3502} 3503 3504QualType ASTContext::getBlockDescriptorExtendedType() const { 3505 if (BlockDescriptorExtendedType) 3506 return getTagDeclType(BlockDescriptorExtendedType); 3507 3508 RecordDecl *T; 3509 // FIXME: Needs the FlagAppleBlock bit. 3510 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3511 &Idents.get("__block_descriptor_withcopydispose")); 3512 T->startDefinition(); 3513 3514 QualType FieldTypes[] = { 3515 UnsignedLongTy, 3516 UnsignedLongTy, 3517 getPointerType(VoidPtrTy), 3518 getPointerType(VoidPtrTy) 3519 }; 3520 3521 const char *FieldNames[] = { 3522 "reserved", 3523 "Size", 3524 "CopyFuncPtr", 3525 "DestroyFuncPtr" 3526 }; 3527 3528 for (size_t i = 0; i < 4; ++i) { 3529 FieldDecl *Field = FieldDecl::Create(*this, 3530 T, 3531 SourceLocation(), 3532 &Idents.get(FieldNames[i]), 3533 FieldTypes[i], /*TInfo=*/0, 3534 /*BitWidth=*/0, 3535 /*Mutable=*/false); 3536 Field->setAccess(AS_public); 3537 T->addDecl(Field); 3538 } 3539 3540 T->completeDefinition(); 3541 3542 BlockDescriptorExtendedType = T; 3543 3544 return getTagDeclType(BlockDescriptorExtendedType); 3545} 3546 3547void ASTContext::setBlockDescriptorExtendedType(QualType T) { 3548 const RecordType *Rec = T->getAs<RecordType>(); 3549 assert(Rec && "Invalid BlockDescriptorType"); 3550 BlockDescriptorExtendedType = Rec->getDecl(); 3551} 3552 3553bool ASTContext::BlockRequiresCopying(QualType Ty) const { 3554 if (Ty->isBlockPointerType()) 3555 return true; 3556 if (isObjCNSObjectType(Ty)) 3557 return true; 3558 if (Ty->isObjCObjectPointerType()) 3559 return true; 3560 if (getLangOptions().CPlusPlus) { 3561 if (const RecordType *RT = Ty->getAs<RecordType>()) { 3562 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3563 return RD->hasConstCopyConstructor(*this); 3564 3565 } 3566 } 3567 return false; 3568} 3569 3570QualType 3571ASTContext::BuildByRefType(llvm::StringRef DeclName, QualType Ty) const { 3572 // type = struct __Block_byref_1_X { 3573 // void *__isa; 3574 // struct __Block_byref_1_X *__forwarding; 3575 // unsigned int __flags; 3576 // unsigned int __size; 3577 // void *__copy_helper; // as needed 3578 // void *__destroy_help // as needed 3579 // int X; 3580 // } * 3581 3582 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 3583 3584 // FIXME: Move up 3585 llvm::SmallString<36> Name; 3586 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 3587 ++UniqueBlockByRefTypeID << '_' << DeclName; 3588 RecordDecl *T; 3589 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3590 &Idents.get(Name.str())); 3591 T->startDefinition(); 3592 QualType Int32Ty = IntTy; 3593 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 3594 QualType FieldTypes[] = { 3595 getPointerType(VoidPtrTy), 3596 getPointerType(getTagDeclType(T)), 3597 Int32Ty, 3598 Int32Ty, 3599 getPointerType(VoidPtrTy), 3600 getPointerType(VoidPtrTy), 3601 Ty 3602 }; 3603 3604 llvm::StringRef FieldNames[] = { 3605 "__isa", 3606 "__forwarding", 3607 "__flags", 3608 "__size", 3609 "__copy_helper", 3610 "__destroy_helper", 3611 DeclName, 3612 }; 3613 3614 for (size_t i = 0; i < 7; ++i) { 3615 if (!HasCopyAndDispose && i >=4 && i <= 5) 3616 continue; 3617 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3618 &Idents.get(FieldNames[i]), 3619 FieldTypes[i], /*TInfo=*/0, 3620 /*BitWidth=*/0, /*Mutable=*/false); 3621 Field->setAccess(AS_public); 3622 T->addDecl(Field); 3623 } 3624 3625 T->completeDefinition(); 3626 3627 return getPointerType(getTagDeclType(T)); 3628} 3629 3630void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3631 const RecordType *Rec = T->getAs<RecordType>(); 3632 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3633 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3634} 3635 3636// This returns true if a type has been typedefed to BOOL: 3637// typedef <type> BOOL; 3638static bool isTypeTypedefedAsBOOL(QualType T) { 3639 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3640 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3641 return II->isStr("BOOL"); 3642 3643 return false; 3644} 3645 3646/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3647/// purpose. 3648CharUnits ASTContext::getObjCEncodingTypeSize(QualType type) const { 3649 CharUnits sz = getTypeSizeInChars(type); 3650 3651 // Make all integer and enum types at least as large as an int 3652 if (sz.isPositive() && type->isIntegralOrEnumerationType()) 3653 sz = std::max(sz, getTypeSizeInChars(IntTy)); 3654 // Treat arrays as pointers, since that's how they're passed in. 3655 else if (type->isArrayType()) 3656 sz = getTypeSizeInChars(VoidPtrTy); 3657 return sz; 3658} 3659 3660static inline 3661std::string charUnitsToString(const CharUnits &CU) { 3662 return llvm::itostr(CU.getQuantity()); 3663} 3664 3665/// getObjCEncodingForBlock - Return the encoded type for this block 3666/// declaration. 3667std::string ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr) const { 3668 std::string S; 3669 3670 const BlockDecl *Decl = Expr->getBlockDecl(); 3671 QualType BlockTy = 3672 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3673 // Encode result type. 3674 getObjCEncodingForType(BlockTy->getAs<FunctionType>()->getResultType(), S); 3675 // Compute size of all parameters. 3676 // Start with computing size of a pointer in number of bytes. 3677 // FIXME: There might(should) be a better way of doing this computation! 3678 SourceLocation Loc; 3679 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3680 CharUnits ParmOffset = PtrSize; 3681 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), 3682 E = Decl->param_end(); PI != E; ++PI) { 3683 QualType PType = (*PI)->getType(); 3684 CharUnits sz = getObjCEncodingTypeSize(PType); 3685 assert (sz.isPositive() && "BlockExpr - Incomplete param type"); 3686 ParmOffset += sz; 3687 } 3688 // Size of the argument frame 3689 S += charUnitsToString(ParmOffset); 3690 // Block pointer and offset. 3691 S += "@?0"; 3692 ParmOffset = PtrSize; 3693 3694 // Argument types. 3695 ParmOffset = PtrSize; 3696 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3697 Decl->param_end(); PI != E; ++PI) { 3698 ParmVarDecl *PVDecl = *PI; 3699 QualType PType = PVDecl->getOriginalType(); 3700 if (const ArrayType *AT = 3701 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3702 // Use array's original type only if it has known number of 3703 // elements. 3704 if (!isa<ConstantArrayType>(AT)) 3705 PType = PVDecl->getType(); 3706 } else if (PType->isFunctionType()) 3707 PType = PVDecl->getType(); 3708 getObjCEncodingForType(PType, S); 3709 S += charUnitsToString(ParmOffset); 3710 ParmOffset += getObjCEncodingTypeSize(PType); 3711 } 3712 3713 return S; 3714} 3715 3716void ASTContext::getObjCEncodingForFunctionDecl(const FunctionDecl *Decl, 3717 std::string& S) { 3718 // Encode result type. 3719 getObjCEncodingForType(Decl->getResultType(), S); 3720 CharUnits ParmOffset; 3721 // Compute size of all parameters. 3722 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3723 E = Decl->param_end(); PI != E; ++PI) { 3724 QualType PType = (*PI)->getType(); 3725 CharUnits sz = getObjCEncodingTypeSize(PType); 3726 assert (sz.isPositive() && 3727 "getObjCEncodingForMethodDecl - Incomplete param type"); 3728 ParmOffset += sz; 3729 } 3730 S += charUnitsToString(ParmOffset); 3731 ParmOffset = CharUnits::Zero(); 3732 3733 // Argument types. 3734 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3735 E = Decl->param_end(); PI != E; ++PI) { 3736 ParmVarDecl *PVDecl = *PI; 3737 QualType PType = PVDecl->getOriginalType(); 3738 if (const ArrayType *AT = 3739 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3740 // Use array's original type only if it has known number of 3741 // elements. 3742 if (!isa<ConstantArrayType>(AT)) 3743 PType = PVDecl->getType(); 3744 } else if (PType->isFunctionType()) 3745 PType = PVDecl->getType(); 3746 getObjCEncodingForType(PType, S); 3747 S += charUnitsToString(ParmOffset); 3748 ParmOffset += getObjCEncodingTypeSize(PType); 3749 } 3750} 3751 3752/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3753/// declaration. 3754void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3755 std::string& S) const { 3756 // FIXME: This is not very efficient. 3757 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3758 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3759 // Encode result type. 3760 getObjCEncodingForType(Decl->getResultType(), S); 3761 // Compute size of all parameters. 3762 // Start with computing size of a pointer in number of bytes. 3763 // FIXME: There might(should) be a better way of doing this computation! 3764 SourceLocation Loc; 3765 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3766 // The first two arguments (self and _cmd) are pointers; account for 3767 // their size. 3768 CharUnits ParmOffset = 2 * PtrSize; 3769 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3770 E = Decl->sel_param_end(); PI != E; ++PI) { 3771 QualType PType = (*PI)->getType(); 3772 CharUnits sz = getObjCEncodingTypeSize(PType); 3773 assert (sz.isPositive() && 3774 "getObjCEncodingForMethodDecl - Incomplete param type"); 3775 ParmOffset += sz; 3776 } 3777 S += charUnitsToString(ParmOffset); 3778 S += "@0:"; 3779 S += charUnitsToString(PtrSize); 3780 3781 // Argument types. 3782 ParmOffset = 2 * PtrSize; 3783 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3784 E = Decl->sel_param_end(); PI != E; ++PI) { 3785 ParmVarDecl *PVDecl = *PI; 3786 QualType PType = PVDecl->getOriginalType(); 3787 if (const ArrayType *AT = 3788 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3789 // Use array's original type only if it has known number of 3790 // elements. 3791 if (!isa<ConstantArrayType>(AT)) 3792 PType = PVDecl->getType(); 3793 } else if (PType->isFunctionType()) 3794 PType = PVDecl->getType(); 3795 // Process argument qualifiers for user supplied arguments; such as, 3796 // 'in', 'inout', etc. 3797 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3798 getObjCEncodingForType(PType, S); 3799 S += charUnitsToString(ParmOffset); 3800 ParmOffset += getObjCEncodingTypeSize(PType); 3801 } 3802} 3803 3804/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3805/// property declaration. If non-NULL, Container must be either an 3806/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3807/// NULL when getting encodings for protocol properties. 3808/// Property attributes are stored as a comma-delimited C string. The simple 3809/// attributes readonly and bycopy are encoded as single characters. The 3810/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3811/// encoded as single characters, followed by an identifier. Property types 3812/// are also encoded as a parametrized attribute. The characters used to encode 3813/// these attributes are defined by the following enumeration: 3814/// @code 3815/// enum PropertyAttributes { 3816/// kPropertyReadOnly = 'R', // property is read-only. 3817/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3818/// kPropertyByref = '&', // property is a reference to the value last assigned 3819/// kPropertyDynamic = 'D', // property is dynamic 3820/// kPropertyGetter = 'G', // followed by getter selector name 3821/// kPropertySetter = 'S', // followed by setter selector name 3822/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3823/// kPropertyType = 't' // followed by old-style type encoding. 3824/// kPropertyWeak = 'W' // 'weak' property 3825/// kPropertyStrong = 'P' // property GC'able 3826/// kPropertyNonAtomic = 'N' // property non-atomic 3827/// }; 3828/// @endcode 3829void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3830 const Decl *Container, 3831 std::string& S) const { 3832 // Collect information from the property implementation decl(s). 3833 bool Dynamic = false; 3834 ObjCPropertyImplDecl *SynthesizePID = 0; 3835 3836 // FIXME: Duplicated code due to poor abstraction. 3837 if (Container) { 3838 if (const ObjCCategoryImplDecl *CID = 3839 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3840 for (ObjCCategoryImplDecl::propimpl_iterator 3841 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3842 i != e; ++i) { 3843 ObjCPropertyImplDecl *PID = *i; 3844 if (PID->getPropertyDecl() == PD) { 3845 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3846 Dynamic = true; 3847 } else { 3848 SynthesizePID = PID; 3849 } 3850 } 3851 } 3852 } else { 3853 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3854 for (ObjCCategoryImplDecl::propimpl_iterator 3855 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3856 i != e; ++i) { 3857 ObjCPropertyImplDecl *PID = *i; 3858 if (PID->getPropertyDecl() == PD) { 3859 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3860 Dynamic = true; 3861 } else { 3862 SynthesizePID = PID; 3863 } 3864 } 3865 } 3866 } 3867 } 3868 3869 // FIXME: This is not very efficient. 3870 S = "T"; 3871 3872 // Encode result type. 3873 // GCC has some special rules regarding encoding of properties which 3874 // closely resembles encoding of ivars. 3875 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3876 true /* outermost type */, 3877 true /* encoding for property */); 3878 3879 if (PD->isReadOnly()) { 3880 S += ",R"; 3881 } else { 3882 switch (PD->getSetterKind()) { 3883 case ObjCPropertyDecl::Assign: break; 3884 case ObjCPropertyDecl::Copy: S += ",C"; break; 3885 case ObjCPropertyDecl::Retain: S += ",&"; break; 3886 } 3887 } 3888 3889 // It really isn't clear at all what this means, since properties 3890 // are "dynamic by default". 3891 if (Dynamic) 3892 S += ",D"; 3893 3894 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3895 S += ",N"; 3896 3897 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3898 S += ",G"; 3899 S += PD->getGetterName().getAsString(); 3900 } 3901 3902 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3903 S += ",S"; 3904 S += PD->getSetterName().getAsString(); 3905 } 3906 3907 if (SynthesizePID) { 3908 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3909 S += ",V"; 3910 S += OID->getNameAsString(); 3911 } 3912 3913 // FIXME: OBJCGC: weak & strong 3914} 3915 3916/// getLegacyIntegralTypeEncoding - 3917/// Another legacy compatibility encoding: 32-bit longs are encoded as 3918/// 'l' or 'L' , but not always. For typedefs, we need to use 3919/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3920/// 3921void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3922 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3923 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3924 if (BT->getKind() == BuiltinType::ULong && getIntWidth(PointeeTy) == 32) 3925 PointeeTy = UnsignedIntTy; 3926 else 3927 if (BT->getKind() == BuiltinType::Long && getIntWidth(PointeeTy) == 32) 3928 PointeeTy = IntTy; 3929 } 3930 } 3931} 3932 3933void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3934 const FieldDecl *Field) const { 3935 // We follow the behavior of gcc, expanding structures which are 3936 // directly pointed to, and expanding embedded structures. Note that 3937 // these rules are sufficient to prevent recursive encoding of the 3938 // same type. 3939 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3940 true /* outermost type */); 3941} 3942 3943static char ObjCEncodingForPrimitiveKind(const ASTContext *C, QualType T) { 3944 switch (T->getAs<BuiltinType>()->getKind()) { 3945 default: assert(0 && "Unhandled builtin type kind"); 3946 case BuiltinType::Void: return 'v'; 3947 case BuiltinType::Bool: return 'B'; 3948 case BuiltinType::Char_U: 3949 case BuiltinType::UChar: return 'C'; 3950 case BuiltinType::UShort: return 'S'; 3951 case BuiltinType::UInt: return 'I'; 3952 case BuiltinType::ULong: 3953 return C->getIntWidth(T) == 32 ? 'L' : 'Q'; 3954 case BuiltinType::UInt128: return 'T'; 3955 case BuiltinType::ULongLong: return 'Q'; 3956 case BuiltinType::Char_S: 3957 case BuiltinType::SChar: return 'c'; 3958 case BuiltinType::Short: return 's'; 3959 case BuiltinType::WChar_S: 3960 case BuiltinType::WChar_U: 3961 case BuiltinType::Int: return 'i'; 3962 case BuiltinType::Long: 3963 return C->getIntWidth(T) == 32 ? 'l' : 'q'; 3964 case BuiltinType::LongLong: return 'q'; 3965 case BuiltinType::Int128: return 't'; 3966 case BuiltinType::Float: return 'f'; 3967 case BuiltinType::Double: return 'd'; 3968 case BuiltinType::LongDouble: return 'D'; 3969 } 3970} 3971 3972static void EncodeBitField(const ASTContext *Ctx, std::string& S, 3973 QualType T, const FieldDecl *FD) { 3974 const Expr *E = FD->getBitWidth(); 3975 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3976 S += 'b'; 3977 // The NeXT runtime encodes bit fields as b followed by the number of bits. 3978 // The GNU runtime requires more information; bitfields are encoded as b, 3979 // then the offset (in bits) of the first element, then the type of the 3980 // bitfield, then the size in bits. For example, in this structure: 3981 // 3982 // struct 3983 // { 3984 // int integer; 3985 // int flags:2; 3986 // }; 3987 // On a 32-bit system, the encoding for flags would be b2 for the NeXT 3988 // runtime, but b32i2 for the GNU runtime. The reason for this extra 3989 // information is not especially sensible, but we're stuck with it for 3990 // compatibility with GCC, although providing it breaks anything that 3991 // actually uses runtime introspection and wants to work on both runtimes... 3992 if (!Ctx->getLangOptions().NeXTRuntime) { 3993 const RecordDecl *RD = FD->getParent(); 3994 const ASTRecordLayout &RL = Ctx->getASTRecordLayout(RD); 3995 // FIXME: This same linear search is also used in ExprConstant - it might 3996 // be better if the FieldDecl stored its offset. We'd be increasing the 3997 // size of the object slightly, but saving some time every time it is used. 3998 unsigned i = 0; 3999 for (RecordDecl::field_iterator Field = RD->field_begin(), 4000 FieldEnd = RD->field_end(); 4001 Field != FieldEnd; (void)++Field, ++i) { 4002 if (*Field == FD) 4003 break; 4004 } 4005 S += llvm::utostr(RL.getFieldOffset(i)); 4006 if (T->isEnumeralType()) 4007 S += 'i'; 4008 else 4009 S += ObjCEncodingForPrimitiveKind(Ctx, T); 4010 } 4011 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 4012 S += llvm::utostr(N); 4013} 4014 4015// FIXME: Use SmallString for accumulating string. 4016void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 4017 bool ExpandPointedToStructures, 4018 bool ExpandStructures, 4019 const FieldDecl *FD, 4020 bool OutermostType, 4021 bool EncodingProperty) const { 4022 if (T->getAs<BuiltinType>()) { 4023 if (FD && FD->isBitField()) 4024 return EncodeBitField(this, S, T, FD); 4025 S += ObjCEncodingForPrimitiveKind(this, T); 4026 return; 4027 } 4028 4029 if (const ComplexType *CT = T->getAs<ComplexType>()) { 4030 S += 'j'; 4031 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 4032 false); 4033 return; 4034 } 4035 4036 // encoding for pointer or r3eference types. 4037 QualType PointeeTy; 4038 if (const PointerType *PT = T->getAs<PointerType>()) { 4039 if (PT->isObjCSelType()) { 4040 S += ':'; 4041 return; 4042 } 4043 PointeeTy = PT->getPointeeType(); 4044 } 4045 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 4046 PointeeTy = RT->getPointeeType(); 4047 if (!PointeeTy.isNull()) { 4048 bool isReadOnly = false; 4049 // For historical/compatibility reasons, the read-only qualifier of the 4050 // pointee gets emitted _before_ the '^'. The read-only qualifier of 4051 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 4052 // Also, do not emit the 'r' for anything but the outermost type! 4053 if (isa<TypedefType>(T.getTypePtr())) { 4054 if (OutermostType && T.isConstQualified()) { 4055 isReadOnly = true; 4056 S += 'r'; 4057 } 4058 } else if (OutermostType) { 4059 QualType P = PointeeTy; 4060 while (P->getAs<PointerType>()) 4061 P = P->getAs<PointerType>()->getPointeeType(); 4062 if (P.isConstQualified()) { 4063 isReadOnly = true; 4064 S += 'r'; 4065 } 4066 } 4067 if (isReadOnly) { 4068 // Another legacy compatibility encoding. Some ObjC qualifier and type 4069 // combinations need to be rearranged. 4070 // Rewrite "in const" from "nr" to "rn" 4071 if (llvm::StringRef(S).endswith("nr")) 4072 S.replace(S.end()-2, S.end(), "rn"); 4073 } 4074 4075 if (PointeeTy->isCharType()) { 4076 // char pointer types should be encoded as '*' unless it is a 4077 // type that has been typedef'd to 'BOOL'. 4078 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 4079 S += '*'; 4080 return; 4081 } 4082 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 4083 // GCC binary compat: Need to convert "struct objc_class *" to "#". 4084 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 4085 S += '#'; 4086 return; 4087 } 4088 // GCC binary compat: Need to convert "struct objc_object *" to "@". 4089 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 4090 S += '@'; 4091 return; 4092 } 4093 // fall through... 4094 } 4095 S += '^'; 4096 getLegacyIntegralTypeEncoding(PointeeTy); 4097 4098 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 4099 NULL); 4100 return; 4101 } 4102 4103 if (const ArrayType *AT = 4104 // Ignore type qualifiers etc. 4105 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 4106 if (isa<IncompleteArrayType>(AT)) { 4107 // Incomplete arrays are encoded as a pointer to the array element. 4108 S += '^'; 4109 4110 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4111 false, ExpandStructures, FD); 4112 } else { 4113 S += '['; 4114 4115 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 4116 S += llvm::utostr(CAT->getSize().getZExtValue()); 4117 else { 4118 //Variable length arrays are encoded as a regular array with 0 elements. 4119 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 4120 S += '0'; 4121 } 4122 4123 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4124 false, ExpandStructures, FD); 4125 S += ']'; 4126 } 4127 return; 4128 } 4129 4130 if (T->getAs<FunctionType>()) { 4131 S += '?'; 4132 return; 4133 } 4134 4135 if (const RecordType *RTy = T->getAs<RecordType>()) { 4136 RecordDecl *RDecl = RTy->getDecl(); 4137 S += RDecl->isUnion() ? '(' : '{'; 4138 // Anonymous structures print as '?' 4139 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 4140 S += II->getName(); 4141 if (ClassTemplateSpecializationDecl *Spec 4142 = dyn_cast<ClassTemplateSpecializationDecl>(RDecl)) { 4143 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 4144 std::string TemplateArgsStr 4145 = TemplateSpecializationType::PrintTemplateArgumentList( 4146 TemplateArgs.data(), 4147 TemplateArgs.size(), 4148 (*this).PrintingPolicy); 4149 4150 S += TemplateArgsStr; 4151 } 4152 } else { 4153 S += '?'; 4154 } 4155 if (ExpandStructures) { 4156 S += '='; 4157 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 4158 FieldEnd = RDecl->field_end(); 4159 Field != FieldEnd; ++Field) { 4160 if (FD) { 4161 S += '"'; 4162 S += Field->getNameAsString(); 4163 S += '"'; 4164 } 4165 4166 // Special case bit-fields. 4167 if (Field->isBitField()) { 4168 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 4169 (*Field)); 4170 } else { 4171 QualType qt = Field->getType(); 4172 getLegacyIntegralTypeEncoding(qt); 4173 getObjCEncodingForTypeImpl(qt, S, false, true, 4174 FD); 4175 } 4176 } 4177 } 4178 S += RDecl->isUnion() ? ')' : '}'; 4179 return; 4180 } 4181 4182 if (T->isEnumeralType()) { 4183 if (FD && FD->isBitField()) 4184 EncodeBitField(this, S, T, FD); 4185 else 4186 S += 'i'; 4187 return; 4188 } 4189 4190 if (T->isBlockPointerType()) { 4191 S += "@?"; // Unlike a pointer-to-function, which is "^?". 4192 return; 4193 } 4194 4195 // Ignore protocol qualifiers when mangling at this level. 4196 if (const ObjCObjectType *OT = T->getAs<ObjCObjectType>()) 4197 T = OT->getBaseType(); 4198 4199 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 4200 // @encode(class_name) 4201 ObjCInterfaceDecl *OI = OIT->getDecl(); 4202 S += '{'; 4203 const IdentifierInfo *II = OI->getIdentifier(); 4204 S += II->getName(); 4205 S += '='; 4206 llvm::SmallVector<ObjCIvarDecl*, 32> Ivars; 4207 DeepCollectObjCIvars(OI, true, Ivars); 4208 for (unsigned i = 0, e = Ivars.size(); i != e; ++i) { 4209 FieldDecl *Field = cast<FieldDecl>(Ivars[i]); 4210 if (Field->isBitField()) 4211 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, Field); 4212 else 4213 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, FD); 4214 } 4215 S += '}'; 4216 return; 4217 } 4218 4219 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 4220 if (OPT->isObjCIdType()) { 4221 S += '@'; 4222 return; 4223 } 4224 4225 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 4226 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 4227 // Since this is a binary compatibility issue, need to consult with runtime 4228 // folks. Fortunately, this is a *very* obsure construct. 4229 S += '#'; 4230 return; 4231 } 4232 4233 if (OPT->isObjCQualifiedIdType()) { 4234 getObjCEncodingForTypeImpl(getObjCIdType(), S, 4235 ExpandPointedToStructures, 4236 ExpandStructures, FD); 4237 if (FD || EncodingProperty) { 4238 // Note that we do extended encoding of protocol qualifer list 4239 // Only when doing ivar or property encoding. 4240 S += '"'; 4241 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4242 E = OPT->qual_end(); I != E; ++I) { 4243 S += '<'; 4244 S += (*I)->getNameAsString(); 4245 S += '>'; 4246 } 4247 S += '"'; 4248 } 4249 return; 4250 } 4251 4252 QualType PointeeTy = OPT->getPointeeType(); 4253 if (!EncodingProperty && 4254 isa<TypedefType>(PointeeTy.getTypePtr())) { 4255 // Another historical/compatibility reason. 4256 // We encode the underlying type which comes out as 4257 // {...}; 4258 S += '^'; 4259 getObjCEncodingForTypeImpl(PointeeTy, S, 4260 false, ExpandPointedToStructures, 4261 NULL); 4262 return; 4263 } 4264 4265 S += '@'; 4266 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 4267 S += '"'; 4268 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 4269 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4270 E = OPT->qual_end(); I != E; ++I) { 4271 S += '<'; 4272 S += (*I)->getNameAsString(); 4273 S += '>'; 4274 } 4275 S += '"'; 4276 } 4277 return; 4278 } 4279 4280 // gcc just blithely ignores member pointers. 4281 // TODO: maybe there should be a mangling for these 4282 if (T->getAs<MemberPointerType>()) 4283 return; 4284 4285 if (T->isVectorType()) { 4286 // This matches gcc's encoding, even though technically it is 4287 // insufficient. 4288 // FIXME. We should do a better job than gcc. 4289 return; 4290 } 4291 4292 assert(0 && "@encode for type not implemented!"); 4293} 4294 4295void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 4296 std::string& S) const { 4297 if (QT & Decl::OBJC_TQ_In) 4298 S += 'n'; 4299 if (QT & Decl::OBJC_TQ_Inout) 4300 S += 'N'; 4301 if (QT & Decl::OBJC_TQ_Out) 4302 S += 'o'; 4303 if (QT & Decl::OBJC_TQ_Bycopy) 4304 S += 'O'; 4305 if (QT & Decl::OBJC_TQ_Byref) 4306 S += 'R'; 4307 if (QT & Decl::OBJC_TQ_Oneway) 4308 S += 'V'; 4309} 4310 4311void ASTContext::setBuiltinVaListType(QualType T) { 4312 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 4313 4314 BuiltinVaListType = T; 4315} 4316 4317void ASTContext::setObjCIdType(QualType T) { 4318 ObjCIdTypedefType = T; 4319} 4320 4321void ASTContext::setObjCSelType(QualType T) { 4322 ObjCSelTypedefType = T; 4323} 4324 4325void ASTContext::setObjCProtoType(QualType QT) { 4326 ObjCProtoType = QT; 4327} 4328 4329void ASTContext::setObjCClassType(QualType T) { 4330 ObjCClassTypedefType = T; 4331} 4332 4333void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 4334 assert(ObjCConstantStringType.isNull() && 4335 "'NSConstantString' type already set!"); 4336 4337 ObjCConstantStringType = getObjCInterfaceType(Decl); 4338} 4339 4340/// \brief Retrieve the template name that corresponds to a non-empty 4341/// lookup. 4342TemplateName 4343ASTContext::getOverloadedTemplateName(UnresolvedSetIterator Begin, 4344 UnresolvedSetIterator End) const { 4345 unsigned size = End - Begin; 4346 assert(size > 1 && "set is not overloaded!"); 4347 4348 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 4349 size * sizeof(FunctionTemplateDecl*)); 4350 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 4351 4352 NamedDecl **Storage = OT->getStorage(); 4353 for (UnresolvedSetIterator I = Begin; I != End; ++I) { 4354 NamedDecl *D = *I; 4355 assert(isa<FunctionTemplateDecl>(D) || 4356 (isa<UsingShadowDecl>(D) && 4357 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 4358 *Storage++ = D; 4359 } 4360 4361 return TemplateName(OT); 4362} 4363 4364/// \brief Retrieve the template name that represents a qualified 4365/// template name such as \c std::vector. 4366TemplateName 4367ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 4368 bool TemplateKeyword, 4369 TemplateDecl *Template) const { 4370 // FIXME: Canonicalization? 4371 llvm::FoldingSetNodeID ID; 4372 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 4373 4374 void *InsertPos = 0; 4375 QualifiedTemplateName *QTN = 4376 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4377 if (!QTN) { 4378 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 4379 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 4380 } 4381 4382 return TemplateName(QTN); 4383} 4384 4385/// \brief Retrieve the template name that represents a dependent 4386/// template name such as \c MetaFun::template apply. 4387TemplateName 4388ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4389 const IdentifierInfo *Name) const { 4390 assert((!NNS || NNS->isDependent()) && 4391 "Nested name specifier must be dependent"); 4392 4393 llvm::FoldingSetNodeID ID; 4394 DependentTemplateName::Profile(ID, NNS, Name); 4395 4396 void *InsertPos = 0; 4397 DependentTemplateName *QTN = 4398 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4399 4400 if (QTN) 4401 return TemplateName(QTN); 4402 4403 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4404 if (CanonNNS == NNS) { 4405 QTN = new (*this,4) DependentTemplateName(NNS, Name); 4406 } else { 4407 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 4408 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 4409 DependentTemplateName *CheckQTN = 4410 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4411 assert(!CheckQTN && "Dependent type name canonicalization broken"); 4412 (void)CheckQTN; 4413 } 4414 4415 DependentTemplateNames.InsertNode(QTN, InsertPos); 4416 return TemplateName(QTN); 4417} 4418 4419/// \brief Retrieve the template name that represents a dependent 4420/// template name such as \c MetaFun::template operator+. 4421TemplateName 4422ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4423 OverloadedOperatorKind Operator) const { 4424 assert((!NNS || NNS->isDependent()) && 4425 "Nested name specifier must be dependent"); 4426 4427 llvm::FoldingSetNodeID ID; 4428 DependentTemplateName::Profile(ID, NNS, Operator); 4429 4430 void *InsertPos = 0; 4431 DependentTemplateName *QTN 4432 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4433 4434 if (QTN) 4435 return TemplateName(QTN); 4436 4437 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4438 if (CanonNNS == NNS) { 4439 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 4440 } else { 4441 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 4442 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 4443 4444 DependentTemplateName *CheckQTN 4445 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4446 assert(!CheckQTN && "Dependent template name canonicalization broken"); 4447 (void)CheckQTN; 4448 } 4449 4450 DependentTemplateNames.InsertNode(QTN, InsertPos); 4451 return TemplateName(QTN); 4452} 4453 4454TemplateName 4455ASTContext::getSubstTemplateTemplateParmPack(TemplateTemplateParmDecl *Param, 4456 const TemplateArgument &ArgPack) const { 4457 ASTContext &Self = const_cast<ASTContext &>(*this); 4458 llvm::FoldingSetNodeID ID; 4459 SubstTemplateTemplateParmPackStorage::Profile(ID, Self, Param, ArgPack); 4460 4461 void *InsertPos = 0; 4462 SubstTemplateTemplateParmPackStorage *Subst 4463 = SubstTemplateTemplateParmPacks.FindNodeOrInsertPos(ID, InsertPos); 4464 4465 if (!Subst) { 4466 Subst = new (*this) SubstTemplateTemplateParmPackStorage(Self, Param, 4467 ArgPack.pack_size(), 4468 ArgPack.pack_begin()); 4469 SubstTemplateTemplateParmPacks.InsertNode(Subst, InsertPos); 4470 } 4471 4472 return TemplateName(Subst); 4473} 4474 4475/// getFromTargetType - Given one of the integer types provided by 4476/// TargetInfo, produce the corresponding type. The unsigned @p Type 4477/// is actually a value of type @c TargetInfo::IntType. 4478CanQualType ASTContext::getFromTargetType(unsigned Type) const { 4479 switch (Type) { 4480 case TargetInfo::NoInt: return CanQualType(); 4481 case TargetInfo::SignedShort: return ShortTy; 4482 case TargetInfo::UnsignedShort: return UnsignedShortTy; 4483 case TargetInfo::SignedInt: return IntTy; 4484 case TargetInfo::UnsignedInt: return UnsignedIntTy; 4485 case TargetInfo::SignedLong: return LongTy; 4486 case TargetInfo::UnsignedLong: return UnsignedLongTy; 4487 case TargetInfo::SignedLongLong: return LongLongTy; 4488 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 4489 } 4490 4491 assert(false && "Unhandled TargetInfo::IntType value"); 4492 return CanQualType(); 4493} 4494 4495//===----------------------------------------------------------------------===// 4496// Type Predicates. 4497//===----------------------------------------------------------------------===// 4498 4499/// isObjCNSObjectType - Return true if this is an NSObject object using 4500/// NSObject attribute on a c-style pointer type. 4501/// FIXME - Make it work directly on types. 4502/// FIXME: Move to Type. 4503/// 4504bool ASTContext::isObjCNSObjectType(QualType Ty) const { 4505 if (const TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 4506 if (TypedefDecl *TD = TDT->getDecl()) 4507 if (TD->getAttr<ObjCNSObjectAttr>()) 4508 return true; 4509 } 4510 return false; 4511} 4512 4513/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 4514/// garbage collection attribute. 4515/// 4516Qualifiers::GC ASTContext::getObjCGCAttrKind(QualType Ty) const { 4517 if (getLangOptions().getGCMode() == LangOptions::NonGC) 4518 return Qualifiers::GCNone; 4519 4520 assert(getLangOptions().ObjC1); 4521 Qualifiers::GC GCAttrs = Ty.getObjCGCAttr(); 4522 4523 // Default behaviour under objective-C's gc is for ObjC pointers 4524 // (or pointers to them) be treated as though they were declared 4525 // as __strong. 4526 if (GCAttrs == Qualifiers::GCNone) { 4527 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 4528 return Qualifiers::Strong; 4529 else if (Ty->isPointerType()) 4530 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 4531 } else { 4532 // It's not valid to set GC attributes on anything that isn't a 4533 // pointer. 4534#ifndef NDEBUG 4535 QualType CT = Ty->getCanonicalTypeInternal(); 4536 while (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 4537 CT = AT->getElementType(); 4538 assert(CT->isAnyPointerType() || CT->isBlockPointerType()); 4539#endif 4540 } 4541 return GCAttrs; 4542} 4543 4544//===----------------------------------------------------------------------===// 4545// Type Compatibility Testing 4546//===----------------------------------------------------------------------===// 4547 4548/// areCompatVectorTypes - Return true if the two specified vector types are 4549/// compatible. 4550static bool areCompatVectorTypes(const VectorType *LHS, 4551 const VectorType *RHS) { 4552 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 4553 return LHS->getElementType() == RHS->getElementType() && 4554 LHS->getNumElements() == RHS->getNumElements(); 4555} 4556 4557bool ASTContext::areCompatibleVectorTypes(QualType FirstVec, 4558 QualType SecondVec) { 4559 assert(FirstVec->isVectorType() && "FirstVec should be a vector type"); 4560 assert(SecondVec->isVectorType() && "SecondVec should be a vector type"); 4561 4562 if (hasSameUnqualifiedType(FirstVec, SecondVec)) 4563 return true; 4564 4565 // Treat Neon vector types and most AltiVec vector types as if they are the 4566 // equivalent GCC vector types. 4567 const VectorType *First = FirstVec->getAs<VectorType>(); 4568 const VectorType *Second = SecondVec->getAs<VectorType>(); 4569 if (First->getNumElements() == Second->getNumElements() && 4570 hasSameType(First->getElementType(), Second->getElementType()) && 4571 First->getVectorKind() != VectorType::AltiVecPixel && 4572 First->getVectorKind() != VectorType::AltiVecBool && 4573 Second->getVectorKind() != VectorType::AltiVecPixel && 4574 Second->getVectorKind() != VectorType::AltiVecBool) 4575 return true; 4576 4577 return false; 4578} 4579 4580//===----------------------------------------------------------------------===// 4581// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 4582//===----------------------------------------------------------------------===// 4583 4584/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 4585/// inheritance hierarchy of 'rProto'. 4586bool 4587ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 4588 ObjCProtocolDecl *rProto) const { 4589 if (lProto == rProto) 4590 return true; 4591 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 4592 E = rProto->protocol_end(); PI != E; ++PI) 4593 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 4594 return true; 4595 return false; 4596} 4597 4598/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 4599/// return true if lhs's protocols conform to rhs's protocol; false 4600/// otherwise. 4601bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 4602 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 4603 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 4604 return false; 4605} 4606 4607/// ObjCQualifiedClassTypesAreCompatible - compare Class<p,...> and 4608/// Class<p1, ...>. 4609bool ASTContext::ObjCQualifiedClassTypesAreCompatible(QualType lhs, 4610 QualType rhs) { 4611 const ObjCObjectPointerType *lhsQID = lhs->getAs<ObjCObjectPointerType>(); 4612 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4613 assert ((lhsQID && rhsOPT) && "ObjCQualifiedClassTypesAreCompatible"); 4614 4615 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4616 E = lhsQID->qual_end(); I != E; ++I) { 4617 bool match = false; 4618 ObjCProtocolDecl *lhsProto = *I; 4619 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4620 E = rhsOPT->qual_end(); J != E; ++J) { 4621 ObjCProtocolDecl *rhsProto = *J; 4622 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto)) { 4623 match = true; 4624 break; 4625 } 4626 } 4627 if (!match) 4628 return false; 4629 } 4630 return true; 4631} 4632 4633/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 4634/// ObjCQualifiedIDType. 4635bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 4636 bool compare) { 4637 // Allow id<P..> and an 'id' or void* type in all cases. 4638 if (lhs->isVoidPointerType() || 4639 lhs->isObjCIdType() || lhs->isObjCClassType()) 4640 return true; 4641 else if (rhs->isVoidPointerType() || 4642 rhs->isObjCIdType() || rhs->isObjCClassType()) 4643 return true; 4644 4645 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 4646 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4647 4648 if (!rhsOPT) return false; 4649 4650 if (rhsOPT->qual_empty()) { 4651 // If the RHS is a unqualified interface pointer "NSString*", 4652 // make sure we check the class hierarchy. 4653 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4654 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4655 E = lhsQID->qual_end(); I != E; ++I) { 4656 // when comparing an id<P> on lhs with a static type on rhs, 4657 // see if static class implements all of id's protocols, directly or 4658 // through its super class and categories. 4659 if (!rhsID->ClassImplementsProtocol(*I, true)) 4660 return false; 4661 } 4662 } 4663 // If there are no qualifiers and no interface, we have an 'id'. 4664 return true; 4665 } 4666 // Both the right and left sides have qualifiers. 4667 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4668 E = lhsQID->qual_end(); I != E; ++I) { 4669 ObjCProtocolDecl *lhsProto = *I; 4670 bool match = false; 4671 4672 // when comparing an id<P> on lhs with a static type on rhs, 4673 // see if static class implements all of id's protocols, directly or 4674 // through its super class and categories. 4675 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4676 E = rhsOPT->qual_end(); J != E; ++J) { 4677 ObjCProtocolDecl *rhsProto = *J; 4678 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4679 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4680 match = true; 4681 break; 4682 } 4683 } 4684 // If the RHS is a qualified interface pointer "NSString<P>*", 4685 // make sure we check the class hierarchy. 4686 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4687 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4688 E = lhsQID->qual_end(); I != E; ++I) { 4689 // when comparing an id<P> on lhs with a static type on rhs, 4690 // see if static class implements all of id's protocols, directly or 4691 // through its super class and categories. 4692 if (rhsID->ClassImplementsProtocol(*I, true)) { 4693 match = true; 4694 break; 4695 } 4696 } 4697 } 4698 if (!match) 4699 return false; 4700 } 4701 4702 return true; 4703 } 4704 4705 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 4706 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 4707 4708 if (const ObjCObjectPointerType *lhsOPT = 4709 lhs->getAsObjCInterfacePointerType()) { 4710 // If both the right and left sides have qualifiers. 4711 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 4712 E = lhsOPT->qual_end(); I != E; ++I) { 4713 ObjCProtocolDecl *lhsProto = *I; 4714 bool match = false; 4715 4716 // when comparing an id<P> on rhs with a static type on lhs, 4717 // see if static class implements all of id's protocols, directly or 4718 // through its super class and categories. 4719 // First, lhs protocols in the qualifier list must be found, direct 4720 // or indirect in rhs's qualifier list or it is a mismatch. 4721 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4722 E = rhsQID->qual_end(); J != E; ++J) { 4723 ObjCProtocolDecl *rhsProto = *J; 4724 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4725 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4726 match = true; 4727 break; 4728 } 4729 } 4730 if (!match) 4731 return false; 4732 } 4733 4734 // Static class's protocols, or its super class or category protocols 4735 // must be found, direct or indirect in rhs's qualifier list or it is a mismatch. 4736 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 4737 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4738 CollectInheritedProtocols(lhsID, LHSInheritedProtocols); 4739 // This is rather dubious but matches gcc's behavior. If lhs has 4740 // no type qualifier and its class has no static protocol(s) 4741 // assume that it is mismatch. 4742 if (LHSInheritedProtocols.empty() && lhsOPT->qual_empty()) 4743 return false; 4744 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4745 LHSInheritedProtocols.begin(), 4746 E = LHSInheritedProtocols.end(); I != E; ++I) { 4747 bool match = false; 4748 ObjCProtocolDecl *lhsProto = (*I); 4749 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4750 E = rhsQID->qual_end(); J != E; ++J) { 4751 ObjCProtocolDecl *rhsProto = *J; 4752 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4753 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4754 match = true; 4755 break; 4756 } 4757 } 4758 if (!match) 4759 return false; 4760 } 4761 } 4762 return true; 4763 } 4764 return false; 4765} 4766 4767/// canAssignObjCInterfaces - Return true if the two interface types are 4768/// compatible for assignment from RHS to LHS. This handles validation of any 4769/// protocol qualifiers on the LHS or RHS. 4770/// 4771bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4772 const ObjCObjectPointerType *RHSOPT) { 4773 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4774 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4775 4776 // If either type represents the built-in 'id' or 'Class' types, return true. 4777 if (LHS->isObjCUnqualifiedIdOrClass() || 4778 RHS->isObjCUnqualifiedIdOrClass()) 4779 return true; 4780 4781 if (LHS->isObjCQualifiedId() || RHS->isObjCQualifiedId()) 4782 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4783 QualType(RHSOPT,0), 4784 false); 4785 4786 if (LHS->isObjCQualifiedClass() && RHS->isObjCQualifiedClass()) 4787 return ObjCQualifiedClassTypesAreCompatible(QualType(LHSOPT,0), 4788 QualType(RHSOPT,0)); 4789 4790 // If we have 2 user-defined types, fall into that path. 4791 if (LHS->getInterface() && RHS->getInterface()) 4792 return canAssignObjCInterfaces(LHS, RHS); 4793 4794 return false; 4795} 4796 4797/// canAssignObjCInterfacesInBlockPointer - This routine is specifically written 4798/// for providing type-safty for objective-c pointers used to pass/return 4799/// arguments in block literals. When passed as arguments, passing 'A*' where 4800/// 'id' is expected is not OK. Passing 'Sub *" where 'Super *" is expected is 4801/// not OK. For the return type, the opposite is not OK. 4802bool ASTContext::canAssignObjCInterfacesInBlockPointer( 4803 const ObjCObjectPointerType *LHSOPT, 4804 const ObjCObjectPointerType *RHSOPT) { 4805 if (RHSOPT->isObjCBuiltinType() || LHSOPT->isObjCIdType()) 4806 return true; 4807 4808 if (LHSOPT->isObjCBuiltinType()) { 4809 return RHSOPT->isObjCBuiltinType() || RHSOPT->isObjCQualifiedIdType(); 4810 } 4811 4812 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4813 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4814 QualType(RHSOPT,0), 4815 false); 4816 4817 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4818 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4819 if (LHS && RHS) { // We have 2 user-defined types. 4820 if (LHS != RHS) { 4821 if (LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4822 return false; 4823 if (RHS->getDecl()->isSuperClassOf(LHS->getDecl())) 4824 return true; 4825 } 4826 else 4827 return true; 4828 } 4829 return false; 4830} 4831 4832/// getIntersectionOfProtocols - This routine finds the intersection of set 4833/// of protocols inherited from two distinct objective-c pointer objects. 4834/// It is used to build composite qualifier list of the composite type of 4835/// the conditional expression involving two objective-c pointer objects. 4836static 4837void getIntersectionOfProtocols(ASTContext &Context, 4838 const ObjCObjectPointerType *LHSOPT, 4839 const ObjCObjectPointerType *RHSOPT, 4840 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4841 4842 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4843 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4844 assert(LHS->getInterface() && "LHS must have an interface base"); 4845 assert(RHS->getInterface() && "RHS must have an interface base"); 4846 4847 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4848 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4849 if (LHSNumProtocols > 0) 4850 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4851 else { 4852 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4853 Context.CollectInheritedProtocols(LHS->getInterface(), 4854 LHSInheritedProtocols); 4855 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4856 LHSInheritedProtocols.end()); 4857 } 4858 4859 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4860 if (RHSNumProtocols > 0) { 4861 ObjCProtocolDecl **RHSProtocols = 4862 const_cast<ObjCProtocolDecl **>(RHS->qual_begin()); 4863 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4864 if (InheritedProtocolSet.count(RHSProtocols[i])) 4865 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4866 } 4867 else { 4868 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4869 Context.CollectInheritedProtocols(RHS->getInterface(), 4870 RHSInheritedProtocols); 4871 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4872 RHSInheritedProtocols.begin(), 4873 E = RHSInheritedProtocols.end(); I != E; ++I) 4874 if (InheritedProtocolSet.count((*I))) 4875 IntersectionOfProtocols.push_back((*I)); 4876 } 4877} 4878 4879/// areCommonBaseCompatible - Returns common base class of the two classes if 4880/// one found. Note that this is O'2 algorithm. But it will be called as the 4881/// last type comparison in a ?-exp of ObjC pointer types before a 4882/// warning is issued. So, its invokation is extremely rare. 4883QualType ASTContext::areCommonBaseCompatible( 4884 const ObjCObjectPointerType *Lptr, 4885 const ObjCObjectPointerType *Rptr) { 4886 const ObjCObjectType *LHS = Lptr->getObjectType(); 4887 const ObjCObjectType *RHS = Rptr->getObjectType(); 4888 const ObjCInterfaceDecl* LDecl = LHS->getInterface(); 4889 const ObjCInterfaceDecl* RDecl = RHS->getInterface(); 4890 if (!LDecl || !RDecl) 4891 return QualType(); 4892 4893 while ((LDecl = LDecl->getSuperClass())) { 4894 LHS = cast<ObjCInterfaceType>(getObjCInterfaceType(LDecl)); 4895 if (canAssignObjCInterfaces(LHS, RHS)) { 4896 llvm::SmallVector<ObjCProtocolDecl *, 8> Protocols; 4897 getIntersectionOfProtocols(*this, Lptr, Rptr, Protocols); 4898 4899 QualType Result = QualType(LHS, 0); 4900 if (!Protocols.empty()) 4901 Result = getObjCObjectType(Result, Protocols.data(), Protocols.size()); 4902 Result = getObjCObjectPointerType(Result); 4903 return Result; 4904 } 4905 } 4906 4907 return QualType(); 4908} 4909 4910bool ASTContext::canAssignObjCInterfaces(const ObjCObjectType *LHS, 4911 const ObjCObjectType *RHS) { 4912 assert(LHS->getInterface() && "LHS is not an interface type"); 4913 assert(RHS->getInterface() && "RHS is not an interface type"); 4914 4915 // Verify that the base decls are compatible: the RHS must be a subclass of 4916 // the LHS. 4917 if (!LHS->getInterface()->isSuperClassOf(RHS->getInterface())) 4918 return false; 4919 4920 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4921 // protocol qualified at all, then we are good. 4922 if (LHS->getNumProtocols() == 0) 4923 return true; 4924 4925 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4926 // isn't a superset. 4927 if (RHS->getNumProtocols() == 0) 4928 return true; // FIXME: should return false! 4929 4930 for (ObjCObjectType::qual_iterator LHSPI = LHS->qual_begin(), 4931 LHSPE = LHS->qual_end(); 4932 LHSPI != LHSPE; LHSPI++) { 4933 bool RHSImplementsProtocol = false; 4934 4935 // If the RHS doesn't implement the protocol on the left, the types 4936 // are incompatible. 4937 for (ObjCObjectType::qual_iterator RHSPI = RHS->qual_begin(), 4938 RHSPE = RHS->qual_end(); 4939 RHSPI != RHSPE; RHSPI++) { 4940 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4941 RHSImplementsProtocol = true; 4942 break; 4943 } 4944 } 4945 // FIXME: For better diagnostics, consider passing back the protocol name. 4946 if (!RHSImplementsProtocol) 4947 return false; 4948 } 4949 // The RHS implements all protocols listed on the LHS. 4950 return true; 4951} 4952 4953bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4954 // get the "pointed to" types 4955 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4956 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4957 4958 if (!LHSOPT || !RHSOPT) 4959 return false; 4960 4961 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4962 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4963} 4964 4965bool ASTContext::canBindObjCObjectType(QualType To, QualType From) { 4966 return canAssignObjCInterfaces( 4967 getObjCObjectPointerType(To)->getAs<ObjCObjectPointerType>(), 4968 getObjCObjectPointerType(From)->getAs<ObjCObjectPointerType>()); 4969} 4970 4971/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4972/// both shall have the identically qualified version of a compatible type. 4973/// C99 6.2.7p1: Two types have compatible types if their types are the 4974/// same. See 6.7.[2,3,5] for additional rules. 4975bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS, 4976 bool CompareUnqualified) { 4977 if (getLangOptions().CPlusPlus) 4978 return hasSameType(LHS, RHS); 4979 4980 return !mergeTypes(LHS, RHS, false, CompareUnqualified).isNull(); 4981} 4982 4983bool ASTContext::typesAreBlockPointerCompatible(QualType LHS, QualType RHS) { 4984 return !mergeTypes(LHS, RHS, true).isNull(); 4985} 4986 4987/// mergeTransparentUnionType - if T is a transparent union type and a member 4988/// of T is compatible with SubType, return the merged type, else return 4989/// QualType() 4990QualType ASTContext::mergeTransparentUnionType(QualType T, QualType SubType, 4991 bool OfBlockPointer, 4992 bool Unqualified) { 4993 if (const RecordType *UT = T->getAsUnionType()) { 4994 RecordDecl *UD = UT->getDecl(); 4995 if (UD->hasAttr<TransparentUnionAttr>()) { 4996 for (RecordDecl::field_iterator it = UD->field_begin(), 4997 itend = UD->field_end(); it != itend; ++it) { 4998 QualType ET = it->getType().getUnqualifiedType(); 4999 QualType MT = mergeTypes(ET, SubType, OfBlockPointer, Unqualified); 5000 if (!MT.isNull()) 5001 return MT; 5002 } 5003 } 5004 } 5005 5006 return QualType(); 5007} 5008 5009/// mergeFunctionArgumentTypes - merge two types which appear as function 5010/// argument types 5011QualType ASTContext::mergeFunctionArgumentTypes(QualType lhs, QualType rhs, 5012 bool OfBlockPointer, 5013 bool Unqualified) { 5014 // GNU extension: two types are compatible if they appear as a function 5015 // argument, one of the types is a transparent union type and the other 5016 // type is compatible with a union member 5017 QualType lmerge = mergeTransparentUnionType(lhs, rhs, OfBlockPointer, 5018 Unqualified); 5019 if (!lmerge.isNull()) 5020 return lmerge; 5021 5022 QualType rmerge = mergeTransparentUnionType(rhs, lhs, OfBlockPointer, 5023 Unqualified); 5024 if (!rmerge.isNull()) 5025 return rmerge; 5026 5027 return mergeTypes(lhs, rhs, OfBlockPointer, Unqualified); 5028} 5029 5030QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs, 5031 bool OfBlockPointer, 5032 bool Unqualified) { 5033 const FunctionType *lbase = lhs->getAs<FunctionType>(); 5034 const FunctionType *rbase = rhs->getAs<FunctionType>(); 5035 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 5036 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 5037 bool allLTypes = true; 5038 bool allRTypes = true; 5039 5040 // Check return type 5041 QualType retType; 5042 if (OfBlockPointer) { 5043 QualType RHS = rbase->getResultType(); 5044 QualType LHS = lbase->getResultType(); 5045 bool UnqualifiedResult = Unqualified; 5046 if (!UnqualifiedResult) 5047 UnqualifiedResult = (!RHS.hasQualifiers() && LHS.hasQualifiers()); 5048 retType = mergeTypes(RHS, LHS, true, UnqualifiedResult); 5049 } 5050 else 5051 retType = mergeTypes(lbase->getResultType(), rbase->getResultType(), false, 5052 Unqualified); 5053 if (retType.isNull()) return QualType(); 5054 5055 if (Unqualified) 5056 retType = retType.getUnqualifiedType(); 5057 5058 CanQualType LRetType = getCanonicalType(lbase->getResultType()); 5059 CanQualType RRetType = getCanonicalType(rbase->getResultType()); 5060 if (Unqualified) { 5061 LRetType = LRetType.getUnqualifiedType(); 5062 RRetType = RRetType.getUnqualifiedType(); 5063 } 5064 5065 if (getCanonicalType(retType) != LRetType) 5066 allLTypes = false; 5067 if (getCanonicalType(retType) != RRetType) 5068 allRTypes = false; 5069 5070 // FIXME: double check this 5071 // FIXME: should we error if lbase->getRegParmAttr() != 0 && 5072 // rbase->getRegParmAttr() != 0 && 5073 // lbase->getRegParmAttr() != rbase->getRegParmAttr()? 5074 FunctionType::ExtInfo lbaseInfo = lbase->getExtInfo(); 5075 FunctionType::ExtInfo rbaseInfo = rbase->getExtInfo(); 5076 5077 // Compatible functions must have compatible calling conventions 5078 if (!isSameCallConv(lbaseInfo.getCC(), rbaseInfo.getCC())) 5079 return QualType(); 5080 5081 // Regparm is part of the calling convention. 5082 if (lbaseInfo.getRegParm() != rbaseInfo.getRegParm()) 5083 return QualType(); 5084 5085 // It's noreturn if either type is. 5086 // FIXME: some uses, e.g. conditional exprs, really want this to be 'both'. 5087 bool NoReturn = lbaseInfo.getNoReturn() || rbaseInfo.getNoReturn(); 5088 if (NoReturn != lbaseInfo.getNoReturn()) 5089 allLTypes = false; 5090 if (NoReturn != rbaseInfo.getNoReturn()) 5091 allRTypes = false; 5092 5093 FunctionType::ExtInfo einfo(NoReturn, 5094 lbaseInfo.getRegParm(), 5095 lbaseInfo.getCC()); 5096 5097 if (lproto && rproto) { // two C99 style function prototypes 5098 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 5099 "C++ shouldn't be here"); 5100 unsigned lproto_nargs = lproto->getNumArgs(); 5101 unsigned rproto_nargs = rproto->getNumArgs(); 5102 5103 // Compatible functions must have the same number of arguments 5104 if (lproto_nargs != rproto_nargs) 5105 return QualType(); 5106 5107 // Variadic and non-variadic functions aren't compatible 5108 if (lproto->isVariadic() != rproto->isVariadic()) 5109 return QualType(); 5110 5111 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 5112 return QualType(); 5113 5114 // Check argument compatibility 5115 llvm::SmallVector<QualType, 10> types; 5116 for (unsigned i = 0; i < lproto_nargs; i++) { 5117 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 5118 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 5119 QualType argtype = mergeFunctionArgumentTypes(largtype, rargtype, 5120 OfBlockPointer, 5121 Unqualified); 5122 if (argtype.isNull()) return QualType(); 5123 5124 if (Unqualified) 5125 argtype = argtype.getUnqualifiedType(); 5126 5127 types.push_back(argtype); 5128 if (Unqualified) { 5129 largtype = largtype.getUnqualifiedType(); 5130 rargtype = rargtype.getUnqualifiedType(); 5131 } 5132 5133 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 5134 allLTypes = false; 5135 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 5136 allRTypes = false; 5137 } 5138 if (allLTypes) return lhs; 5139 if (allRTypes) return rhs; 5140 5141 FunctionProtoType::ExtProtoInfo EPI = lproto->getExtProtoInfo(); 5142 EPI.ExtInfo = einfo; 5143 return getFunctionType(retType, types.begin(), types.size(), EPI); 5144 } 5145 5146 if (lproto) allRTypes = false; 5147 if (rproto) allLTypes = false; 5148 5149 const FunctionProtoType *proto = lproto ? lproto : rproto; 5150 if (proto) { 5151 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 5152 if (proto->isVariadic()) return QualType(); 5153 // Check that the types are compatible with the types that 5154 // would result from default argument promotions (C99 6.7.5.3p15). 5155 // The only types actually affected are promotable integer 5156 // types and floats, which would be passed as a different 5157 // type depending on whether the prototype is visible. 5158 unsigned proto_nargs = proto->getNumArgs(); 5159 for (unsigned i = 0; i < proto_nargs; ++i) { 5160 QualType argTy = proto->getArgType(i); 5161 5162 // Look at the promotion type of enum types, since that is the type used 5163 // to pass enum values. 5164 if (const EnumType *Enum = argTy->getAs<EnumType>()) 5165 argTy = Enum->getDecl()->getPromotionType(); 5166 5167 if (argTy->isPromotableIntegerType() || 5168 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 5169 return QualType(); 5170 } 5171 5172 if (allLTypes) return lhs; 5173 if (allRTypes) return rhs; 5174 5175 FunctionProtoType::ExtProtoInfo EPI = proto->getExtProtoInfo(); 5176 EPI.ExtInfo = einfo; 5177 return getFunctionType(retType, proto->arg_type_begin(), 5178 proto->getNumArgs(), EPI); 5179 } 5180 5181 if (allLTypes) return lhs; 5182 if (allRTypes) return rhs; 5183 return getFunctionNoProtoType(retType, einfo); 5184} 5185 5186QualType ASTContext::mergeTypes(QualType LHS, QualType RHS, 5187 bool OfBlockPointer, 5188 bool Unqualified) { 5189 // C++ [expr]: If an expression initially has the type "reference to T", the 5190 // type is adjusted to "T" prior to any further analysis, the expression 5191 // designates the object or function denoted by the reference, and the 5192 // expression is an lvalue unless the reference is an rvalue reference and 5193 // the expression is a function call (possibly inside parentheses). 5194 assert(!LHS->getAs<ReferenceType>() && "LHS is a reference type?"); 5195 assert(!RHS->getAs<ReferenceType>() && "RHS is a reference type?"); 5196 5197 if (Unqualified) { 5198 LHS = LHS.getUnqualifiedType(); 5199 RHS = RHS.getUnqualifiedType(); 5200 } 5201 5202 QualType LHSCan = getCanonicalType(LHS), 5203 RHSCan = getCanonicalType(RHS); 5204 5205 // If two types are identical, they are compatible. 5206 if (LHSCan == RHSCan) 5207 return LHS; 5208 5209 // If the qualifiers are different, the types aren't compatible... mostly. 5210 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5211 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5212 if (LQuals != RQuals) { 5213 // If any of these qualifiers are different, we have a type 5214 // mismatch. 5215 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5216 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5217 return QualType(); 5218 5219 // Exactly one GC qualifier difference is allowed: __strong is 5220 // okay if the other type has no GC qualifier but is an Objective 5221 // C object pointer (i.e. implicitly strong by default). We fix 5222 // this by pretending that the unqualified type was actually 5223 // qualified __strong. 5224 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5225 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5226 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5227 5228 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5229 return QualType(); 5230 5231 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 5232 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 5233 } 5234 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 5235 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 5236 } 5237 return QualType(); 5238 } 5239 5240 // Okay, qualifiers are equal. 5241 5242 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 5243 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 5244 5245 // We want to consider the two function types to be the same for these 5246 // comparisons, just force one to the other. 5247 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 5248 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 5249 5250 // Same as above for arrays 5251 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 5252 LHSClass = Type::ConstantArray; 5253 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 5254 RHSClass = Type::ConstantArray; 5255 5256 // ObjCInterfaces are just specialized ObjCObjects. 5257 if (LHSClass == Type::ObjCInterface) LHSClass = Type::ObjCObject; 5258 if (RHSClass == Type::ObjCInterface) RHSClass = Type::ObjCObject; 5259 5260 // Canonicalize ExtVector -> Vector. 5261 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 5262 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 5263 5264 // If the canonical type classes don't match. 5265 if (LHSClass != RHSClass) { 5266 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 5267 // a signed integer type, or an unsigned integer type. 5268 // Compatibility is based on the underlying type, not the promotion 5269 // type. 5270 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 5271 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 5272 return RHS; 5273 } 5274 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 5275 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 5276 return LHS; 5277 } 5278 5279 return QualType(); 5280 } 5281 5282 // The canonical type classes match. 5283 switch (LHSClass) { 5284#define TYPE(Class, Base) 5285#define ABSTRACT_TYPE(Class, Base) 5286#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: 5287#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 5288#define DEPENDENT_TYPE(Class, Base) case Type::Class: 5289#include "clang/AST/TypeNodes.def" 5290 assert(false && "Non-canonical and dependent types shouldn't get here"); 5291 return QualType(); 5292 5293 case Type::LValueReference: 5294 case Type::RValueReference: 5295 case Type::MemberPointer: 5296 assert(false && "C++ should never be in mergeTypes"); 5297 return QualType(); 5298 5299 case Type::ObjCInterface: 5300 case Type::IncompleteArray: 5301 case Type::VariableArray: 5302 case Type::FunctionProto: 5303 case Type::ExtVector: 5304 assert(false && "Types are eliminated above"); 5305 return QualType(); 5306 5307 case Type::Pointer: 5308 { 5309 // Merge two pointer types, while trying to preserve typedef info 5310 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 5311 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 5312 if (Unqualified) { 5313 LHSPointee = LHSPointee.getUnqualifiedType(); 5314 RHSPointee = RHSPointee.getUnqualifiedType(); 5315 } 5316 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, false, 5317 Unqualified); 5318 if (ResultType.isNull()) return QualType(); 5319 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5320 return LHS; 5321 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5322 return RHS; 5323 return getPointerType(ResultType); 5324 } 5325 case Type::BlockPointer: 5326 { 5327 // Merge two block pointer types, while trying to preserve typedef info 5328 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 5329 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 5330 if (Unqualified) { 5331 LHSPointee = LHSPointee.getUnqualifiedType(); 5332 RHSPointee = RHSPointee.getUnqualifiedType(); 5333 } 5334 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, OfBlockPointer, 5335 Unqualified); 5336 if (ResultType.isNull()) return QualType(); 5337 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5338 return LHS; 5339 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5340 return RHS; 5341 return getBlockPointerType(ResultType); 5342 } 5343 case Type::ConstantArray: 5344 { 5345 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 5346 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 5347 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 5348 return QualType(); 5349 5350 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 5351 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 5352 if (Unqualified) { 5353 LHSElem = LHSElem.getUnqualifiedType(); 5354 RHSElem = RHSElem.getUnqualifiedType(); 5355 } 5356 5357 QualType ResultType = mergeTypes(LHSElem, RHSElem, false, Unqualified); 5358 if (ResultType.isNull()) return QualType(); 5359 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5360 return LHS; 5361 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5362 return RHS; 5363 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 5364 ArrayType::ArraySizeModifier(), 0); 5365 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 5366 ArrayType::ArraySizeModifier(), 0); 5367 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 5368 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 5369 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5370 return LHS; 5371 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5372 return RHS; 5373 if (LVAT) { 5374 // FIXME: This isn't correct! But tricky to implement because 5375 // the array's size has to be the size of LHS, but the type 5376 // has to be different. 5377 return LHS; 5378 } 5379 if (RVAT) { 5380 // FIXME: This isn't correct! But tricky to implement because 5381 // the array's size has to be the size of RHS, but the type 5382 // has to be different. 5383 return RHS; 5384 } 5385 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 5386 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 5387 return getIncompleteArrayType(ResultType, 5388 ArrayType::ArraySizeModifier(), 0); 5389 } 5390 case Type::FunctionNoProto: 5391 return mergeFunctionTypes(LHS, RHS, OfBlockPointer, Unqualified); 5392 case Type::Record: 5393 case Type::Enum: 5394 return QualType(); 5395 case Type::Builtin: 5396 // Only exactly equal builtin types are compatible, which is tested above. 5397 return QualType(); 5398 case Type::Complex: 5399 // Distinct complex types are incompatible. 5400 return QualType(); 5401 case Type::Vector: 5402 // FIXME: The merged type should be an ExtVector! 5403 if (areCompatVectorTypes(LHSCan->getAs<VectorType>(), 5404 RHSCan->getAs<VectorType>())) 5405 return LHS; 5406 return QualType(); 5407 case Type::ObjCObject: { 5408 // Check if the types are assignment compatible. 5409 // FIXME: This should be type compatibility, e.g. whether 5410 // "LHS x; RHS x;" at global scope is legal. 5411 const ObjCObjectType* LHSIface = LHS->getAs<ObjCObjectType>(); 5412 const ObjCObjectType* RHSIface = RHS->getAs<ObjCObjectType>(); 5413 if (canAssignObjCInterfaces(LHSIface, RHSIface)) 5414 return LHS; 5415 5416 return QualType(); 5417 } 5418 case Type::ObjCObjectPointer: { 5419 if (OfBlockPointer) { 5420 if (canAssignObjCInterfacesInBlockPointer( 5421 LHS->getAs<ObjCObjectPointerType>(), 5422 RHS->getAs<ObjCObjectPointerType>())) 5423 return LHS; 5424 return QualType(); 5425 } 5426 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 5427 RHS->getAs<ObjCObjectPointerType>())) 5428 return LHS; 5429 5430 return QualType(); 5431 } 5432 } 5433 5434 return QualType(); 5435} 5436 5437/// mergeObjCGCQualifiers - This routine merges ObjC's GC attribute of 'LHS' and 5438/// 'RHS' attributes and returns the merged version; including for function 5439/// return types. 5440QualType ASTContext::mergeObjCGCQualifiers(QualType LHS, QualType RHS) { 5441 QualType LHSCan = getCanonicalType(LHS), 5442 RHSCan = getCanonicalType(RHS); 5443 // If two types are identical, they are compatible. 5444 if (LHSCan == RHSCan) 5445 return LHS; 5446 if (RHSCan->isFunctionType()) { 5447 if (!LHSCan->isFunctionType()) 5448 return QualType(); 5449 QualType OldReturnType = 5450 cast<FunctionType>(RHSCan.getTypePtr())->getResultType(); 5451 QualType NewReturnType = 5452 cast<FunctionType>(LHSCan.getTypePtr())->getResultType(); 5453 QualType ResReturnType = 5454 mergeObjCGCQualifiers(NewReturnType, OldReturnType); 5455 if (ResReturnType.isNull()) 5456 return QualType(); 5457 if (ResReturnType == NewReturnType || ResReturnType == OldReturnType) { 5458 // id foo(); ... __strong id foo(); or: __strong id foo(); ... id foo(); 5459 // In either case, use OldReturnType to build the new function type. 5460 const FunctionType *F = LHS->getAs<FunctionType>(); 5461 if (const FunctionProtoType *FPT = cast<FunctionProtoType>(F)) { 5462 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5463 EPI.ExtInfo = getFunctionExtInfo(LHS); 5464 QualType ResultType 5465 = getFunctionType(OldReturnType, FPT->arg_type_begin(), 5466 FPT->getNumArgs(), EPI); 5467 return ResultType; 5468 } 5469 } 5470 return QualType(); 5471 } 5472 5473 // If the qualifiers are different, the types can still be merged. 5474 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5475 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5476 if (LQuals != RQuals) { 5477 // If any of these qualifiers are different, we have a type mismatch. 5478 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5479 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5480 return QualType(); 5481 5482 // Exactly one GC qualifier difference is allowed: __strong is 5483 // okay if the other type has no GC qualifier but is an Objective 5484 // C object pointer (i.e. implicitly strong by default). We fix 5485 // this by pretending that the unqualified type was actually 5486 // qualified __strong. 5487 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5488 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5489 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5490 5491 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5492 return QualType(); 5493 5494 if (GC_L == Qualifiers::Strong) 5495 return LHS; 5496 if (GC_R == Qualifiers::Strong) 5497 return RHS; 5498 return QualType(); 5499 } 5500 5501 if (LHSCan->isObjCObjectPointerType() && RHSCan->isObjCObjectPointerType()) { 5502 QualType LHSBaseQT = LHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5503 QualType RHSBaseQT = RHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5504 QualType ResQT = mergeObjCGCQualifiers(LHSBaseQT, RHSBaseQT); 5505 if (ResQT == LHSBaseQT) 5506 return LHS; 5507 if (ResQT == RHSBaseQT) 5508 return RHS; 5509 } 5510 return QualType(); 5511} 5512 5513//===----------------------------------------------------------------------===// 5514// Integer Predicates 5515//===----------------------------------------------------------------------===// 5516 5517unsigned ASTContext::getIntWidth(QualType T) const { 5518 if (const EnumType *ET = dyn_cast<EnumType>(T)) 5519 T = ET->getDecl()->getIntegerType(); 5520 if (T->isBooleanType()) 5521 return 1; 5522 // For builtin types, just use the standard type sizing method 5523 return (unsigned)getTypeSize(T); 5524} 5525 5526QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 5527 assert(T->hasSignedIntegerRepresentation() && "Unexpected type"); 5528 5529 // Turn <4 x signed int> -> <4 x unsigned int> 5530 if (const VectorType *VTy = T->getAs<VectorType>()) 5531 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 5532 VTy->getNumElements(), VTy->getVectorKind()); 5533 5534 // For enums, we return the unsigned version of the base type. 5535 if (const EnumType *ETy = T->getAs<EnumType>()) 5536 T = ETy->getDecl()->getIntegerType(); 5537 5538 const BuiltinType *BTy = T->getAs<BuiltinType>(); 5539 assert(BTy && "Unexpected signed integer type"); 5540 switch (BTy->getKind()) { 5541 case BuiltinType::Char_S: 5542 case BuiltinType::SChar: 5543 return UnsignedCharTy; 5544 case BuiltinType::Short: 5545 return UnsignedShortTy; 5546 case BuiltinType::Int: 5547 return UnsignedIntTy; 5548 case BuiltinType::Long: 5549 return UnsignedLongTy; 5550 case BuiltinType::LongLong: 5551 return UnsignedLongLongTy; 5552 case BuiltinType::Int128: 5553 return UnsignedInt128Ty; 5554 default: 5555 assert(0 && "Unexpected signed integer type"); 5556 return QualType(); 5557 } 5558} 5559 5560ExternalASTSource::~ExternalASTSource() { } 5561 5562void ExternalASTSource::PrintStats() { } 5563 5564ASTMutationListener::~ASTMutationListener() { } 5565 5566 5567//===----------------------------------------------------------------------===// 5568// Builtin Type Computation 5569//===----------------------------------------------------------------------===// 5570 5571/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 5572/// pointer over the consumed characters. This returns the resultant type. If 5573/// AllowTypeModifiers is false then modifier like * are not parsed, just basic 5574/// types. This allows "v2i*" to be parsed as a pointer to a v2i instead of 5575/// a vector of "i*". 5576/// 5577/// RequiresICE is filled in on return to indicate whether the value is required 5578/// to be an Integer Constant Expression. 5579static QualType DecodeTypeFromStr(const char *&Str, const ASTContext &Context, 5580 ASTContext::GetBuiltinTypeError &Error, 5581 bool &RequiresICE, 5582 bool AllowTypeModifiers) { 5583 // Modifiers. 5584 int HowLong = 0; 5585 bool Signed = false, Unsigned = false; 5586 RequiresICE = false; 5587 5588 // Read the prefixed modifiers first. 5589 bool Done = false; 5590 while (!Done) { 5591 switch (*Str++) { 5592 default: Done = true; --Str; break; 5593 case 'I': 5594 RequiresICE = true; 5595 break; 5596 case 'S': 5597 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 5598 assert(!Signed && "Can't use 'S' modifier multiple times!"); 5599 Signed = true; 5600 break; 5601 case 'U': 5602 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 5603 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 5604 Unsigned = true; 5605 break; 5606 case 'L': 5607 assert(HowLong <= 2 && "Can't have LLLL modifier"); 5608 ++HowLong; 5609 break; 5610 } 5611 } 5612 5613 QualType Type; 5614 5615 // Read the base type. 5616 switch (*Str++) { 5617 default: assert(0 && "Unknown builtin type letter!"); 5618 case 'v': 5619 assert(HowLong == 0 && !Signed && !Unsigned && 5620 "Bad modifiers used with 'v'!"); 5621 Type = Context.VoidTy; 5622 break; 5623 case 'f': 5624 assert(HowLong == 0 && !Signed && !Unsigned && 5625 "Bad modifiers used with 'f'!"); 5626 Type = Context.FloatTy; 5627 break; 5628 case 'd': 5629 assert(HowLong < 2 && !Signed && !Unsigned && 5630 "Bad modifiers used with 'd'!"); 5631 if (HowLong) 5632 Type = Context.LongDoubleTy; 5633 else 5634 Type = Context.DoubleTy; 5635 break; 5636 case 's': 5637 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 5638 if (Unsigned) 5639 Type = Context.UnsignedShortTy; 5640 else 5641 Type = Context.ShortTy; 5642 break; 5643 case 'i': 5644 if (HowLong == 3) 5645 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 5646 else if (HowLong == 2) 5647 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 5648 else if (HowLong == 1) 5649 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 5650 else 5651 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 5652 break; 5653 case 'c': 5654 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 5655 if (Signed) 5656 Type = Context.SignedCharTy; 5657 else if (Unsigned) 5658 Type = Context.UnsignedCharTy; 5659 else 5660 Type = Context.CharTy; 5661 break; 5662 case 'b': // boolean 5663 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 5664 Type = Context.BoolTy; 5665 break; 5666 case 'z': // size_t. 5667 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 5668 Type = Context.getSizeType(); 5669 break; 5670 case 'F': 5671 Type = Context.getCFConstantStringType(); 5672 break; 5673 case 'G': 5674 Type = Context.getObjCIdType(); 5675 break; 5676 case 'H': 5677 Type = Context.getObjCSelType(); 5678 break; 5679 case 'a': 5680 Type = Context.getBuiltinVaListType(); 5681 assert(!Type.isNull() && "builtin va list type not initialized!"); 5682 break; 5683 case 'A': 5684 // This is a "reference" to a va_list; however, what exactly 5685 // this means depends on how va_list is defined. There are two 5686 // different kinds of va_list: ones passed by value, and ones 5687 // passed by reference. An example of a by-value va_list is 5688 // x86, where va_list is a char*. An example of by-ref va_list 5689 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 5690 // we want this argument to be a char*&; for x86-64, we want 5691 // it to be a __va_list_tag*. 5692 Type = Context.getBuiltinVaListType(); 5693 assert(!Type.isNull() && "builtin va list type not initialized!"); 5694 if (Type->isArrayType()) 5695 Type = Context.getArrayDecayedType(Type); 5696 else 5697 Type = Context.getLValueReferenceType(Type); 5698 break; 5699 case 'V': { 5700 char *End; 5701 unsigned NumElements = strtoul(Str, &End, 10); 5702 assert(End != Str && "Missing vector size"); 5703 Str = End; 5704 5705 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, 5706 RequiresICE, false); 5707 assert(!RequiresICE && "Can't require vector ICE"); 5708 5709 // TODO: No way to make AltiVec vectors in builtins yet. 5710 Type = Context.getVectorType(ElementType, NumElements, 5711 VectorType::GenericVector); 5712 break; 5713 } 5714 case 'X': { 5715 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, RequiresICE, 5716 false); 5717 assert(!RequiresICE && "Can't require complex ICE"); 5718 Type = Context.getComplexType(ElementType); 5719 break; 5720 } 5721 case 'P': 5722 Type = Context.getFILEType(); 5723 if (Type.isNull()) { 5724 Error = ASTContext::GE_Missing_stdio; 5725 return QualType(); 5726 } 5727 break; 5728 case 'J': 5729 if (Signed) 5730 Type = Context.getsigjmp_bufType(); 5731 else 5732 Type = Context.getjmp_bufType(); 5733 5734 if (Type.isNull()) { 5735 Error = ASTContext::GE_Missing_setjmp; 5736 return QualType(); 5737 } 5738 break; 5739 } 5740 5741 // If there are modifiers and if we're allowed to parse them, go for it. 5742 Done = !AllowTypeModifiers; 5743 while (!Done) { 5744 switch (char c = *Str++) { 5745 default: Done = true; --Str; break; 5746 case '*': 5747 case '&': { 5748 // Both pointers and references can have their pointee types 5749 // qualified with an address space. 5750 char *End; 5751 unsigned AddrSpace = strtoul(Str, &End, 10); 5752 if (End != Str && AddrSpace != 0) { 5753 Type = Context.getAddrSpaceQualType(Type, AddrSpace); 5754 Str = End; 5755 } 5756 if (c == '*') 5757 Type = Context.getPointerType(Type); 5758 else 5759 Type = Context.getLValueReferenceType(Type); 5760 break; 5761 } 5762 // FIXME: There's no way to have a built-in with an rvalue ref arg. 5763 case 'C': 5764 Type = Type.withConst(); 5765 break; 5766 case 'D': 5767 Type = Context.getVolatileType(Type); 5768 break; 5769 } 5770 } 5771 5772 assert((!RequiresICE || Type->isIntegralOrEnumerationType()) && 5773 "Integer constant 'I' type must be an integer"); 5774 5775 return Type; 5776} 5777 5778/// GetBuiltinType - Return the type for the specified builtin. 5779QualType ASTContext::GetBuiltinType(unsigned Id, 5780 GetBuiltinTypeError &Error, 5781 unsigned *IntegerConstantArgs) const { 5782 const char *TypeStr = BuiltinInfo.GetTypeString(Id); 5783 5784 llvm::SmallVector<QualType, 8> ArgTypes; 5785 5786 bool RequiresICE = false; 5787 Error = GE_None; 5788 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error, 5789 RequiresICE, true); 5790 if (Error != GE_None) 5791 return QualType(); 5792 5793 assert(!RequiresICE && "Result of intrinsic cannot be required to be an ICE"); 5794 5795 while (TypeStr[0] && TypeStr[0] != '.') { 5796 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error, RequiresICE, true); 5797 if (Error != GE_None) 5798 return QualType(); 5799 5800 // If this argument is required to be an IntegerConstantExpression and the 5801 // caller cares, fill in the bitmask we return. 5802 if (RequiresICE && IntegerConstantArgs) 5803 *IntegerConstantArgs |= 1 << ArgTypes.size(); 5804 5805 // Do array -> pointer decay. The builtin should use the decayed type. 5806 if (Ty->isArrayType()) 5807 Ty = getArrayDecayedType(Ty); 5808 5809 ArgTypes.push_back(Ty); 5810 } 5811 5812 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 5813 "'.' should only occur at end of builtin type list!"); 5814 5815 FunctionType::ExtInfo EI; 5816 if (BuiltinInfo.isNoReturn(Id)) EI = EI.withNoReturn(true); 5817 5818 bool Variadic = (TypeStr[0] == '.'); 5819 5820 // We really shouldn't be making a no-proto type here, especially in C++. 5821 if (ArgTypes.empty() && Variadic) 5822 return getFunctionNoProtoType(ResType, EI); 5823 5824 FunctionProtoType::ExtProtoInfo EPI; 5825 EPI.ExtInfo = EI; 5826 EPI.Variadic = Variadic; 5827 5828 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), EPI); 5829} 5830 5831GVALinkage ASTContext::GetGVALinkageForFunction(const FunctionDecl *FD) { 5832 GVALinkage External = GVA_StrongExternal; 5833 5834 Linkage L = FD->getLinkage(); 5835 switch (L) { 5836 case NoLinkage: 5837 case InternalLinkage: 5838 case UniqueExternalLinkage: 5839 return GVA_Internal; 5840 5841 case ExternalLinkage: 5842 switch (FD->getTemplateSpecializationKind()) { 5843 case TSK_Undeclared: 5844 case TSK_ExplicitSpecialization: 5845 External = GVA_StrongExternal; 5846 break; 5847 5848 case TSK_ExplicitInstantiationDefinition: 5849 return GVA_ExplicitTemplateInstantiation; 5850 5851 case TSK_ExplicitInstantiationDeclaration: 5852 case TSK_ImplicitInstantiation: 5853 External = GVA_TemplateInstantiation; 5854 break; 5855 } 5856 } 5857 5858 if (!FD->isInlined()) 5859 return External; 5860 5861 if (!getLangOptions().CPlusPlus || FD->hasAttr<GNUInlineAttr>()) { 5862 // GNU or C99 inline semantics. Determine whether this symbol should be 5863 // externally visible. 5864 if (FD->isInlineDefinitionExternallyVisible()) 5865 return External; 5866 5867 // C99 inline semantics, where the symbol is not externally visible. 5868 return GVA_C99Inline; 5869 } 5870 5871 // C++0x [temp.explicit]p9: 5872 // [ Note: The intent is that an inline function that is the subject of 5873 // an explicit instantiation declaration will still be implicitly 5874 // instantiated when used so that the body can be considered for 5875 // inlining, but that no out-of-line copy of the inline function would be 5876 // generated in the translation unit. -- end note ] 5877 if (FD->getTemplateSpecializationKind() 5878 == TSK_ExplicitInstantiationDeclaration) 5879 return GVA_C99Inline; 5880 5881 return GVA_CXXInline; 5882} 5883 5884GVALinkage ASTContext::GetGVALinkageForVariable(const VarDecl *VD) { 5885 // If this is a static data member, compute the kind of template 5886 // specialization. Otherwise, this variable is not part of a 5887 // template. 5888 TemplateSpecializationKind TSK = TSK_Undeclared; 5889 if (VD->isStaticDataMember()) 5890 TSK = VD->getTemplateSpecializationKind(); 5891 5892 Linkage L = VD->getLinkage(); 5893 if (L == ExternalLinkage && getLangOptions().CPlusPlus && 5894 VD->getType()->getLinkage() == UniqueExternalLinkage) 5895 L = UniqueExternalLinkage; 5896 5897 switch (L) { 5898 case NoLinkage: 5899 case InternalLinkage: 5900 case UniqueExternalLinkage: 5901 return GVA_Internal; 5902 5903 case ExternalLinkage: 5904 switch (TSK) { 5905 case TSK_Undeclared: 5906 case TSK_ExplicitSpecialization: 5907 return GVA_StrongExternal; 5908 5909 case TSK_ExplicitInstantiationDeclaration: 5910 llvm_unreachable("Variable should not be instantiated"); 5911 // Fall through to treat this like any other instantiation. 5912 5913 case TSK_ExplicitInstantiationDefinition: 5914 return GVA_ExplicitTemplateInstantiation; 5915 5916 case TSK_ImplicitInstantiation: 5917 return GVA_TemplateInstantiation; 5918 } 5919 } 5920 5921 return GVA_StrongExternal; 5922} 5923 5924bool ASTContext::DeclMustBeEmitted(const Decl *D) { 5925 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 5926 if (!VD->isFileVarDecl()) 5927 return false; 5928 } else if (!isa<FunctionDecl>(D)) 5929 return false; 5930 5931 // Weak references don't produce any output by themselves. 5932 if (D->hasAttr<WeakRefAttr>()) 5933 return false; 5934 5935 // Aliases and used decls are required. 5936 if (D->hasAttr<AliasAttr>() || D->hasAttr<UsedAttr>()) 5937 return true; 5938 5939 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 5940 // Forward declarations aren't required. 5941 if (!FD->isThisDeclarationADefinition()) 5942 return false; 5943 5944 // Constructors and destructors are required. 5945 if (FD->hasAttr<ConstructorAttr>() || FD->hasAttr<DestructorAttr>()) 5946 return true; 5947 5948 // The key function for a class is required. 5949 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 5950 const CXXRecordDecl *RD = MD->getParent(); 5951 if (MD->isOutOfLine() && RD->isDynamicClass()) { 5952 const CXXMethodDecl *KeyFunc = getKeyFunction(RD); 5953 if (KeyFunc && KeyFunc->getCanonicalDecl() == MD->getCanonicalDecl()) 5954 return true; 5955 } 5956 } 5957 5958 GVALinkage Linkage = GetGVALinkageForFunction(FD); 5959 5960 // static, static inline, always_inline, and extern inline functions can 5961 // always be deferred. Normal inline functions can be deferred in C99/C++. 5962 // Implicit template instantiations can also be deferred in C++. 5963 if (Linkage == GVA_Internal || Linkage == GVA_C99Inline || 5964 Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) 5965 return false; 5966 return true; 5967 } 5968 5969 const VarDecl *VD = cast<VarDecl>(D); 5970 assert(VD->isFileVarDecl() && "Expected file scoped var"); 5971 5972 if (VD->isThisDeclarationADefinition() == VarDecl::DeclarationOnly) 5973 return false; 5974 5975 // Structs that have non-trivial constructors or destructors are required. 5976 5977 // FIXME: Handle references. 5978 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 5979 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 5980 if (RD->hasDefinition() && 5981 (!RD->hasTrivialConstructor() || !RD->hasTrivialDestructor())) 5982 return true; 5983 } 5984 } 5985 5986 GVALinkage L = GetGVALinkageForVariable(VD); 5987 if (L == GVA_Internal || L == GVA_TemplateInstantiation) { 5988 if (!(VD->getInit() && VD->getInit()->HasSideEffects(*this))) 5989 return false; 5990 } 5991 5992 return true; 5993} 5994 5995CallingConv ASTContext::getDefaultMethodCallConv() { 5996 // Pass through to the C++ ABI object 5997 return ABI->getDefaultMethodCallConv(); 5998} 5999 6000bool ASTContext::isNearlyEmpty(const CXXRecordDecl *RD) const { 6001 // Pass through to the C++ ABI object 6002 return ABI->isNearlyEmpty(RD); 6003} 6004 6005MangleContext *ASTContext::createMangleContext() { 6006 switch (Target.getCXXABI()) { 6007 case CXXABI_ARM: 6008 case CXXABI_Itanium: 6009 return createItaniumMangleContext(*this, getDiagnostics()); 6010 case CXXABI_Microsoft: 6011 return createMicrosoftMangleContext(*this, getDiagnostics()); 6012 } 6013 assert(0 && "Unsupported ABI"); 6014 return 0; 6015} 6016 6017CXXABI::~CXXABI() {} 6018