ASTContext.cpp revision aa2187de137e5b809dcbbe14f3b61ae907a3d8aa
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 || NNS->isDependent()) && 2381 "nested-name-specifier must be dependent"); 2382 2383 llvm::FoldingSetNodeID ID; 2384 DependentTemplateSpecializationType::Profile(ID, *this, Keyword, NNS, 2385 Name, NumArgs, Args); 2386 2387 void *InsertPos = 0; 2388 DependentTemplateSpecializationType *T 2389 = DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2390 if (T) 2391 return QualType(T, 0); 2392 2393 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 2394 2395 ElaboratedTypeKeyword CanonKeyword = Keyword; 2396 if (Keyword == ETK_None) CanonKeyword = ETK_Typename; 2397 2398 bool AnyNonCanonArgs = false; 2399 llvm::SmallVector<TemplateArgument, 16> CanonArgs(NumArgs); 2400 for (unsigned I = 0; I != NumArgs; ++I) { 2401 CanonArgs[I] = getCanonicalTemplateArgument(Args[I]); 2402 if (!CanonArgs[I].structurallyEquals(Args[I])) 2403 AnyNonCanonArgs = true; 2404 } 2405 2406 QualType Canon; 2407 if (AnyNonCanonArgs || CanonNNS != NNS || CanonKeyword != Keyword) { 2408 Canon = getDependentTemplateSpecializationType(CanonKeyword, CanonNNS, 2409 Name, NumArgs, 2410 CanonArgs.data()); 2411 2412 // Find the insert position again. 2413 DependentTemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 2414 } 2415 2416 void *Mem = Allocate((sizeof(DependentTemplateSpecializationType) + 2417 sizeof(TemplateArgument) * NumArgs), 2418 TypeAlignment); 2419 T = new (Mem) DependentTemplateSpecializationType(Keyword, NNS, 2420 Name, NumArgs, Args, Canon); 2421 Types.push_back(T); 2422 DependentTemplateSpecializationTypes.InsertNode(T, InsertPos); 2423 return QualType(T, 0); 2424} 2425 2426QualType ASTContext::getPackExpansionType(QualType Pattern, 2427 llvm::Optional<unsigned> NumExpansions) { 2428 llvm::FoldingSetNodeID ID; 2429 PackExpansionType::Profile(ID, Pattern, NumExpansions); 2430 2431 assert(Pattern->containsUnexpandedParameterPack() && 2432 "Pack expansions must expand one or more parameter packs"); 2433 void *InsertPos = 0; 2434 PackExpansionType *T 2435 = PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2436 if (T) 2437 return QualType(T, 0); 2438 2439 QualType Canon; 2440 if (!Pattern.isCanonical()) { 2441 Canon = getPackExpansionType(getCanonicalType(Pattern), NumExpansions); 2442 2443 // Find the insert position again. 2444 PackExpansionTypes.FindNodeOrInsertPos(ID, InsertPos); 2445 } 2446 2447 T = new (*this) PackExpansionType(Pattern, Canon, NumExpansions); 2448 Types.push_back(T); 2449 PackExpansionTypes.InsertNode(T, InsertPos); 2450 return QualType(T, 0); 2451} 2452 2453/// CmpProtocolNames - Comparison predicate for sorting protocols 2454/// alphabetically. 2455static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 2456 const ObjCProtocolDecl *RHS) { 2457 return LHS->getDeclName() < RHS->getDeclName(); 2458} 2459 2460static bool areSortedAndUniqued(ObjCProtocolDecl * const *Protocols, 2461 unsigned NumProtocols) { 2462 if (NumProtocols == 0) return true; 2463 2464 for (unsigned i = 1; i != NumProtocols; ++i) 2465 if (!CmpProtocolNames(Protocols[i-1], Protocols[i])) 2466 return false; 2467 return true; 2468} 2469 2470static void SortAndUniqueProtocols(ObjCProtocolDecl **Protocols, 2471 unsigned &NumProtocols) { 2472 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 2473 2474 // Sort protocols, keyed by name. 2475 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 2476 2477 // Remove duplicates. 2478 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 2479 NumProtocols = ProtocolsEnd-Protocols; 2480} 2481 2482QualType ASTContext::getObjCObjectType(QualType BaseType, 2483 ObjCProtocolDecl * const *Protocols, 2484 unsigned NumProtocols) const { 2485 // If the base type is an interface and there aren't any protocols 2486 // to add, then the interface type will do just fine. 2487 if (!NumProtocols && isa<ObjCInterfaceType>(BaseType)) 2488 return BaseType; 2489 2490 // Look in the folding set for an existing type. 2491 llvm::FoldingSetNodeID ID; 2492 ObjCObjectTypeImpl::Profile(ID, BaseType, Protocols, NumProtocols); 2493 void *InsertPos = 0; 2494 if (ObjCObjectType *QT = ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos)) 2495 return QualType(QT, 0); 2496 2497 // Build the canonical type, which has the canonical base type and 2498 // a sorted-and-uniqued list of protocols. 2499 QualType Canonical; 2500 bool ProtocolsSorted = areSortedAndUniqued(Protocols, NumProtocols); 2501 if (!ProtocolsSorted || !BaseType.isCanonical()) { 2502 if (!ProtocolsSorted) { 2503 llvm::SmallVector<ObjCProtocolDecl*, 8> Sorted(Protocols, 2504 Protocols + NumProtocols); 2505 unsigned UniqueCount = NumProtocols; 2506 2507 SortAndUniqueProtocols(&Sorted[0], UniqueCount); 2508 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2509 &Sorted[0], UniqueCount); 2510 } else { 2511 Canonical = getObjCObjectType(getCanonicalType(BaseType), 2512 Protocols, NumProtocols); 2513 } 2514 2515 // Regenerate InsertPos. 2516 ObjCObjectTypes.FindNodeOrInsertPos(ID, InsertPos); 2517 } 2518 2519 unsigned Size = sizeof(ObjCObjectTypeImpl); 2520 Size += NumProtocols * sizeof(ObjCProtocolDecl *); 2521 void *Mem = Allocate(Size, TypeAlignment); 2522 ObjCObjectTypeImpl *T = 2523 new (Mem) ObjCObjectTypeImpl(Canonical, BaseType, Protocols, NumProtocols); 2524 2525 Types.push_back(T); 2526 ObjCObjectTypes.InsertNode(T, InsertPos); 2527 return QualType(T, 0); 2528} 2529 2530/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 2531/// the given object type. 2532QualType ASTContext::getObjCObjectPointerType(QualType ObjectT) const { 2533 llvm::FoldingSetNodeID ID; 2534 ObjCObjectPointerType::Profile(ID, ObjectT); 2535 2536 void *InsertPos = 0; 2537 if (ObjCObjectPointerType *QT = 2538 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 2539 return QualType(QT, 0); 2540 2541 // Find the canonical object type. 2542 QualType Canonical; 2543 if (!ObjectT.isCanonical()) { 2544 Canonical = getObjCObjectPointerType(getCanonicalType(ObjectT)); 2545 2546 // Regenerate InsertPos. 2547 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 2548 } 2549 2550 // No match. 2551 void *Mem = Allocate(sizeof(ObjCObjectPointerType), TypeAlignment); 2552 ObjCObjectPointerType *QType = 2553 new (Mem) ObjCObjectPointerType(Canonical, ObjectT); 2554 2555 Types.push_back(QType); 2556 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 2557 return QualType(QType, 0); 2558} 2559 2560/// getObjCInterfaceType - Return the unique reference to the type for the 2561/// specified ObjC interface decl. The list of protocols is optional. 2562QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) const { 2563 if (Decl->TypeForDecl) 2564 return QualType(Decl->TypeForDecl, 0); 2565 2566 // FIXME: redeclarations? 2567 void *Mem = Allocate(sizeof(ObjCInterfaceType), TypeAlignment); 2568 ObjCInterfaceType *T = new (Mem) ObjCInterfaceType(Decl); 2569 Decl->TypeForDecl = T; 2570 Types.push_back(T); 2571 return QualType(T, 0); 2572} 2573 2574/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2575/// TypeOfExprType AST's (since expression's are never shared). For example, 2576/// multiple declarations that refer to "typeof(x)" all contain different 2577/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2578/// on canonical type's (which are always unique). 2579QualType ASTContext::getTypeOfExprType(Expr *tofExpr) const { 2580 TypeOfExprType *toe; 2581 if (tofExpr->isTypeDependent()) { 2582 llvm::FoldingSetNodeID ID; 2583 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2584 2585 void *InsertPos = 0; 2586 DependentTypeOfExprType *Canon 2587 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2588 if (Canon) { 2589 // We already have a "canonical" version of an identical, dependent 2590 // typeof(expr) type. Use that as our canonical type. 2591 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2592 QualType((TypeOfExprType*)Canon, 0)); 2593 } 2594 else { 2595 // Build a new, canonical typeof(expr) type. 2596 Canon 2597 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2598 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2599 toe = Canon; 2600 } 2601 } else { 2602 QualType Canonical = getCanonicalType(tofExpr->getType()); 2603 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2604 } 2605 Types.push_back(toe); 2606 return QualType(toe, 0); 2607} 2608 2609/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2610/// TypeOfType AST's. The only motivation to unique these nodes would be 2611/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2612/// an issue. This doesn't effect the type checker, since it operates 2613/// on canonical type's (which are always unique). 2614QualType ASTContext::getTypeOfType(QualType tofType) const { 2615 QualType Canonical = getCanonicalType(tofType); 2616 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2617 Types.push_back(tot); 2618 return QualType(tot, 0); 2619} 2620 2621/// getDecltypeForExpr - Given an expr, will return the decltype for that 2622/// expression, according to the rules in C++0x [dcl.type.simple]p4 2623static QualType getDecltypeForExpr(const Expr *e, const ASTContext &Context) { 2624 if (e->isTypeDependent()) 2625 return Context.DependentTy; 2626 2627 // If e is an id expression or a class member access, decltype(e) is defined 2628 // as the type of the entity named by e. 2629 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2630 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2631 return VD->getType(); 2632 } 2633 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2634 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2635 return FD->getType(); 2636 } 2637 // If e is a function call or an invocation of an overloaded operator, 2638 // (parentheses around e are ignored), decltype(e) is defined as the 2639 // return type of that function. 2640 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2641 return CE->getCallReturnType(); 2642 2643 QualType T = e->getType(); 2644 2645 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2646 // defined as T&, otherwise decltype(e) is defined as T. 2647 if (e->isLValue()) 2648 T = Context.getLValueReferenceType(T); 2649 2650 return T; 2651} 2652 2653/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2654/// DecltypeType AST's. The only motivation to unique these nodes would be 2655/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2656/// an issue. This doesn't effect the type checker, since it operates 2657/// on canonical type's (which are always unique). 2658QualType ASTContext::getDecltypeType(Expr *e) const { 2659 DecltypeType *dt; 2660 if (e->isTypeDependent()) { 2661 llvm::FoldingSetNodeID ID; 2662 DependentDecltypeType::Profile(ID, *this, e); 2663 2664 void *InsertPos = 0; 2665 DependentDecltypeType *Canon 2666 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2667 if (Canon) { 2668 // We already have a "canonical" version of an equivalent, dependent 2669 // decltype type. Use that as our canonical type. 2670 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2671 QualType((DecltypeType*)Canon, 0)); 2672 } 2673 else { 2674 // Build a new, canonical typeof(expr) type. 2675 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2676 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2677 dt = Canon; 2678 } 2679 } else { 2680 QualType T = getDecltypeForExpr(e, *this); 2681 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2682 } 2683 Types.push_back(dt); 2684 return QualType(dt, 0); 2685} 2686 2687/// getAutoType - We only unique auto types after they've been deduced. 2688QualType ASTContext::getAutoType(QualType DeducedType) const { 2689 void *InsertPos = 0; 2690 if (!DeducedType.isNull()) { 2691 // Look in the folding set for an existing type. 2692 llvm::FoldingSetNodeID ID; 2693 AutoType::Profile(ID, DeducedType); 2694 if (AutoType *AT = AutoTypes.FindNodeOrInsertPos(ID, InsertPos)) 2695 return QualType(AT, 0); 2696 } 2697 2698 AutoType *AT = new (*this, TypeAlignment) AutoType(DeducedType); 2699 Types.push_back(AT); 2700 if (InsertPos) 2701 AutoTypes.InsertNode(AT, InsertPos); 2702 return QualType(AT, 0); 2703} 2704 2705/// getTagDeclType - Return the unique reference to the type for the 2706/// specified TagDecl (struct/union/class/enum) decl. 2707QualType ASTContext::getTagDeclType(const TagDecl *Decl) const { 2708 assert (Decl); 2709 // FIXME: What is the design on getTagDeclType when it requires casting 2710 // away const? mutable? 2711 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2712} 2713 2714/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2715/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2716/// needs to agree with the definition in <stddef.h>. 2717CanQualType ASTContext::getSizeType() const { 2718 return getFromTargetType(Target.getSizeType()); 2719} 2720 2721/// getSignedWCharType - Return the type of "signed wchar_t". 2722/// Used when in C++, as a GCC extension. 2723QualType ASTContext::getSignedWCharType() const { 2724 // FIXME: derive from "Target" ? 2725 return WCharTy; 2726} 2727 2728/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2729/// Used when in C++, as a GCC extension. 2730QualType ASTContext::getUnsignedWCharType() const { 2731 // FIXME: derive from "Target" ? 2732 return UnsignedIntTy; 2733} 2734 2735/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2736/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2737QualType ASTContext::getPointerDiffType() const { 2738 return getFromTargetType(Target.getPtrDiffType(0)); 2739} 2740 2741//===----------------------------------------------------------------------===// 2742// Type Operators 2743//===----------------------------------------------------------------------===// 2744 2745CanQualType ASTContext::getCanonicalParamType(QualType T) const { 2746 // Push qualifiers into arrays, and then discard any remaining 2747 // qualifiers. 2748 T = getCanonicalType(T); 2749 T = getVariableArrayDecayedType(T); 2750 const Type *Ty = T.getTypePtr(); 2751 QualType Result; 2752 if (isa<ArrayType>(Ty)) { 2753 Result = getArrayDecayedType(QualType(Ty,0)); 2754 } else if (isa<FunctionType>(Ty)) { 2755 Result = getPointerType(QualType(Ty, 0)); 2756 } else { 2757 Result = QualType(Ty, 0); 2758 } 2759 2760 return CanQualType::CreateUnsafe(Result); 2761} 2762 2763 2764QualType ASTContext::getUnqualifiedArrayType(QualType type, 2765 Qualifiers &quals) { 2766 SplitQualType splitType = type.getSplitUnqualifiedType(); 2767 2768 // FIXME: getSplitUnqualifiedType() actually walks all the way to 2769 // the unqualified desugared type and then drops it on the floor. 2770 // We then have to strip that sugar back off with 2771 // getUnqualifiedDesugaredType(), which is silly. 2772 const ArrayType *AT = 2773 dyn_cast<ArrayType>(splitType.first->getUnqualifiedDesugaredType()); 2774 2775 // If we don't have an array, just use the results in splitType. 2776 if (!AT) { 2777 quals = splitType.second; 2778 return QualType(splitType.first, 0); 2779 } 2780 2781 // Otherwise, recurse on the array's element type. 2782 QualType elementType = AT->getElementType(); 2783 QualType unqualElementType = getUnqualifiedArrayType(elementType, quals); 2784 2785 // If that didn't change the element type, AT has no qualifiers, so we 2786 // can just use the results in splitType. 2787 if (elementType == unqualElementType) { 2788 assert(quals.empty()); // from the recursive call 2789 quals = splitType.second; 2790 return QualType(splitType.first, 0); 2791 } 2792 2793 // Otherwise, add in the qualifiers from the outermost type, then 2794 // build the type back up. 2795 quals.addConsistentQualifiers(splitType.second); 2796 2797 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) { 2798 return getConstantArrayType(unqualElementType, CAT->getSize(), 2799 CAT->getSizeModifier(), 0); 2800 } 2801 2802 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 2803 return getIncompleteArrayType(unqualElementType, IAT->getSizeModifier(), 0); 2804 } 2805 2806 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(AT)) { 2807 return getVariableArrayType(unqualElementType, 2808 VAT->getSizeExpr(), 2809 VAT->getSizeModifier(), 2810 VAT->getIndexTypeCVRQualifiers(), 2811 VAT->getBracketsRange()); 2812 } 2813 2814 const DependentSizedArrayType *DSAT = cast<DependentSizedArrayType>(AT); 2815 return getDependentSizedArrayType(unqualElementType, DSAT->getSizeExpr(), 2816 DSAT->getSizeModifier(), 0, 2817 SourceRange()); 2818} 2819 2820/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 2821/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 2822/// they point to and return true. If T1 and T2 aren't pointer types 2823/// or pointer-to-member types, or if they are not similar at this 2824/// level, returns false and leaves T1 and T2 unchanged. Top-level 2825/// qualifiers on T1 and T2 are ignored. This function will typically 2826/// be called in a loop that successively "unwraps" pointer and 2827/// pointer-to-member types to compare them at each level. 2828bool ASTContext::UnwrapSimilarPointerTypes(QualType &T1, QualType &T2) { 2829 const PointerType *T1PtrType = T1->getAs<PointerType>(), 2830 *T2PtrType = T2->getAs<PointerType>(); 2831 if (T1PtrType && T2PtrType) { 2832 T1 = T1PtrType->getPointeeType(); 2833 T2 = T2PtrType->getPointeeType(); 2834 return true; 2835 } 2836 2837 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 2838 *T2MPType = T2->getAs<MemberPointerType>(); 2839 if (T1MPType && T2MPType && 2840 hasSameUnqualifiedType(QualType(T1MPType->getClass(), 0), 2841 QualType(T2MPType->getClass(), 0))) { 2842 T1 = T1MPType->getPointeeType(); 2843 T2 = T2MPType->getPointeeType(); 2844 return true; 2845 } 2846 2847 if (getLangOptions().ObjC1) { 2848 const ObjCObjectPointerType *T1OPType = T1->getAs<ObjCObjectPointerType>(), 2849 *T2OPType = T2->getAs<ObjCObjectPointerType>(); 2850 if (T1OPType && T2OPType) { 2851 T1 = T1OPType->getPointeeType(); 2852 T2 = T2OPType->getPointeeType(); 2853 return true; 2854 } 2855 } 2856 2857 // FIXME: Block pointers, too? 2858 2859 return false; 2860} 2861 2862DeclarationNameInfo 2863ASTContext::getNameForTemplate(TemplateName Name, 2864 SourceLocation NameLoc) const { 2865 if (TemplateDecl *TD = Name.getAsTemplateDecl()) 2866 // DNInfo work in progress: CHECKME: what about DNLoc? 2867 return DeclarationNameInfo(TD->getDeclName(), NameLoc); 2868 2869 if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) { 2870 DeclarationName DName; 2871 if (DTN->isIdentifier()) { 2872 DName = DeclarationNames.getIdentifier(DTN->getIdentifier()); 2873 return DeclarationNameInfo(DName, NameLoc); 2874 } else { 2875 DName = DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2876 // DNInfo work in progress: FIXME: source locations? 2877 DeclarationNameLoc DNLoc; 2878 DNLoc.CXXOperatorName.BeginOpNameLoc = SourceLocation().getRawEncoding(); 2879 DNLoc.CXXOperatorName.EndOpNameLoc = SourceLocation().getRawEncoding(); 2880 return DeclarationNameInfo(DName, NameLoc, DNLoc); 2881 } 2882 } 2883 2884 OverloadedTemplateStorage *Storage = Name.getAsOverloadedTemplate(); 2885 assert(Storage); 2886 // DNInfo work in progress: CHECKME: what about DNLoc? 2887 return DeclarationNameInfo((*Storage->begin())->getDeclName(), NameLoc); 2888} 2889 2890TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) const { 2891 if (TemplateDecl *Template = Name.getAsTemplateDecl()) { 2892 if (TemplateTemplateParmDecl *TTP 2893 = dyn_cast<TemplateTemplateParmDecl>(Template)) 2894 Template = getCanonicalTemplateTemplateParmDecl(TTP); 2895 2896 // The canonical template name is the canonical template declaration. 2897 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2898 } 2899 2900 if (SubstTemplateTemplateParmPackStorage *SubstPack 2901 = Name.getAsSubstTemplateTemplateParmPack()) { 2902 TemplateTemplateParmDecl *CanonParam 2903 = getCanonicalTemplateTemplateParmDecl(SubstPack->getParameterPack()); 2904 TemplateArgument CanonArgPack 2905 = getCanonicalTemplateArgument(SubstPack->getArgumentPack()); 2906 return getSubstTemplateTemplateParmPack(CanonParam, CanonArgPack); 2907 } 2908 2909 assert(!Name.getAsOverloadedTemplate()); 2910 2911 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2912 assert(DTN && "Non-dependent template names must refer to template decls."); 2913 return DTN->CanonicalTemplateName; 2914} 2915 2916bool ASTContext::hasSameTemplateName(TemplateName X, TemplateName Y) { 2917 X = getCanonicalTemplateName(X); 2918 Y = getCanonicalTemplateName(Y); 2919 return X.getAsVoidPointer() == Y.getAsVoidPointer(); 2920} 2921 2922TemplateArgument 2923ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) const { 2924 switch (Arg.getKind()) { 2925 case TemplateArgument::Null: 2926 return Arg; 2927 2928 case TemplateArgument::Expression: 2929 return Arg; 2930 2931 case TemplateArgument::Declaration: 2932 return TemplateArgument(Arg.getAsDecl()->getCanonicalDecl()); 2933 2934 case TemplateArgument::Template: 2935 return TemplateArgument(getCanonicalTemplateName(Arg.getAsTemplate())); 2936 2937 case TemplateArgument::TemplateExpansion: 2938 return TemplateArgument(getCanonicalTemplateName( 2939 Arg.getAsTemplateOrTemplatePattern()), 2940 Arg.getNumTemplateExpansions()); 2941 2942 case TemplateArgument::Integral: 2943 return TemplateArgument(*Arg.getAsIntegral(), 2944 getCanonicalType(Arg.getIntegralType())); 2945 2946 case TemplateArgument::Type: 2947 return TemplateArgument(getCanonicalType(Arg.getAsType())); 2948 2949 case TemplateArgument::Pack: { 2950 if (Arg.pack_size() == 0) 2951 return Arg; 2952 2953 TemplateArgument *CanonArgs 2954 = new (*this) TemplateArgument[Arg.pack_size()]; 2955 unsigned Idx = 0; 2956 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2957 AEnd = Arg.pack_end(); 2958 A != AEnd; (void)++A, ++Idx) 2959 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2960 2961 return TemplateArgument(CanonArgs, Arg.pack_size()); 2962 } 2963 } 2964 2965 // Silence GCC warning 2966 assert(false && "Unhandled template argument kind"); 2967 return TemplateArgument(); 2968} 2969 2970NestedNameSpecifier * 2971ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) const { 2972 if (!NNS) 2973 return 0; 2974 2975 switch (NNS->getKind()) { 2976 case NestedNameSpecifier::Identifier: 2977 // Canonicalize the prefix but keep the identifier the same. 2978 return NestedNameSpecifier::Create(*this, 2979 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2980 NNS->getAsIdentifier()); 2981 2982 case NestedNameSpecifier::Namespace: 2983 // A namespace is canonical; build a nested-name-specifier with 2984 // this namespace and no prefix. 2985 return NestedNameSpecifier::Create(*this, 0, 2986 NNS->getAsNamespace()->getOriginalNamespace()); 2987 2988 case NestedNameSpecifier::NamespaceAlias: 2989 // A namespace is canonical; build a nested-name-specifier with 2990 // this namespace and no prefix. 2991 return NestedNameSpecifier::Create(*this, 0, 2992 NNS->getAsNamespaceAlias()->getNamespace() 2993 ->getOriginalNamespace()); 2994 2995 case NestedNameSpecifier::TypeSpec: 2996 case NestedNameSpecifier::TypeSpecWithTemplate: { 2997 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2998 2999 // If we have some kind of dependent-named type (e.g., "typename T::type"), 3000 // break it apart into its prefix and identifier, then reconsititute those 3001 // as the canonical nested-name-specifier. This is required to canonicalize 3002 // a dependent nested-name-specifier involving typedefs of dependent-name 3003 // types, e.g., 3004 // typedef typename T::type T1; 3005 // typedef typename T1::type T2; 3006 if (const DependentNameType *DNT = T->getAs<DependentNameType>()) { 3007 NestedNameSpecifier *Prefix 3008 = getCanonicalNestedNameSpecifier(DNT->getQualifier()); 3009 return NestedNameSpecifier::Create(*this, Prefix, 3010 const_cast<IdentifierInfo *>(DNT->getIdentifier())); 3011 } 3012 3013 // Do the same thing as above, but with dependent-named specializations. 3014 if (const DependentTemplateSpecializationType *DTST 3015 = T->getAs<DependentTemplateSpecializationType>()) { 3016 NestedNameSpecifier *Prefix 3017 = getCanonicalNestedNameSpecifier(DTST->getQualifier()); 3018 3019 T = getDependentTemplateSpecializationType(DTST->getKeyword(), 3020 Prefix, DTST->getIdentifier(), 3021 DTST->getNumArgs(), 3022 DTST->getArgs()); 3023 T = getCanonicalType(T); 3024 } 3025 3026 return NestedNameSpecifier::Create(*this, 0, false, 3027 const_cast<Type*>(T.getTypePtr())); 3028 } 3029 3030 case NestedNameSpecifier::Global: 3031 // The global specifier is canonical and unique. 3032 return NNS; 3033 } 3034 3035 // Required to silence a GCC warning 3036 return 0; 3037} 3038 3039 3040const ArrayType *ASTContext::getAsArrayType(QualType T) const { 3041 // Handle the non-qualified case efficiently. 3042 if (!T.hasLocalQualifiers()) { 3043 // Handle the common positive case fast. 3044 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 3045 return AT; 3046 } 3047 3048 // Handle the common negative case fast. 3049 if (!isa<ArrayType>(T.getCanonicalType())) 3050 return 0; 3051 3052 // Apply any qualifiers from the array type to the element type. This 3053 // implements C99 6.7.3p8: "If the specification of an array type includes 3054 // any type qualifiers, the element type is so qualified, not the array type." 3055 3056 // If we get here, we either have type qualifiers on the type, or we have 3057 // sugar such as a typedef in the way. If we have type qualifiers on the type 3058 // we must propagate them down into the element type. 3059 3060 SplitQualType split = T.getSplitDesugaredType(); 3061 Qualifiers qs = split.second; 3062 3063 // If we have a simple case, just return now. 3064 const ArrayType *ATy = dyn_cast<ArrayType>(split.first); 3065 if (ATy == 0 || qs.empty()) 3066 return ATy; 3067 3068 // Otherwise, we have an array and we have qualifiers on it. Push the 3069 // qualifiers into the array element type and return a new array type. 3070 QualType NewEltTy = getQualifiedType(ATy->getElementType(), qs); 3071 3072 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 3073 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 3074 CAT->getSizeModifier(), 3075 CAT->getIndexTypeCVRQualifiers())); 3076 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 3077 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 3078 IAT->getSizeModifier(), 3079 IAT->getIndexTypeCVRQualifiers())); 3080 3081 if (const DependentSizedArrayType *DSAT 3082 = dyn_cast<DependentSizedArrayType>(ATy)) 3083 return cast<ArrayType>( 3084 getDependentSizedArrayType(NewEltTy, 3085 DSAT->getSizeExpr(), 3086 DSAT->getSizeModifier(), 3087 DSAT->getIndexTypeCVRQualifiers(), 3088 DSAT->getBracketsRange())); 3089 3090 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 3091 return cast<ArrayType>(getVariableArrayType(NewEltTy, 3092 VAT->getSizeExpr(), 3093 VAT->getSizeModifier(), 3094 VAT->getIndexTypeCVRQualifiers(), 3095 VAT->getBracketsRange())); 3096} 3097 3098/// getArrayDecayedType - Return the properly qualified result of decaying the 3099/// specified array type to a pointer. This operation is non-trivial when 3100/// handling typedefs etc. The canonical type of "T" must be an array type, 3101/// this returns a pointer to a properly qualified element of the array. 3102/// 3103/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 3104QualType ASTContext::getArrayDecayedType(QualType Ty) const { 3105 // Get the element type with 'getAsArrayType' so that we don't lose any 3106 // typedefs in the element type of the array. This also handles propagation 3107 // of type qualifiers from the array type into the element type if present 3108 // (C99 6.7.3p8). 3109 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 3110 assert(PrettyArrayType && "Not an array type!"); 3111 3112 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 3113 3114 // int x[restrict 4] -> int *restrict 3115 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 3116} 3117 3118QualType ASTContext::getBaseElementType(const ArrayType *array) const { 3119 return getBaseElementType(array->getElementType()); 3120} 3121 3122QualType ASTContext::getBaseElementType(QualType type) const { 3123 Qualifiers qs; 3124 while (true) { 3125 SplitQualType split = type.getSplitDesugaredType(); 3126 const ArrayType *array = split.first->getAsArrayTypeUnsafe(); 3127 if (!array) break; 3128 3129 type = array->getElementType(); 3130 qs.addConsistentQualifiers(split.second); 3131 } 3132 3133 return getQualifiedType(type, qs); 3134} 3135 3136/// getConstantArrayElementCount - Returns number of constant array elements. 3137uint64_t 3138ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 3139 uint64_t ElementCount = 1; 3140 do { 3141 ElementCount *= CA->getSize().getZExtValue(); 3142 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 3143 } while (CA); 3144 return ElementCount; 3145} 3146 3147/// getFloatingRank - Return a relative rank for floating point types. 3148/// This routine will assert if passed a built-in type that isn't a float. 3149static FloatingRank getFloatingRank(QualType T) { 3150 if (const ComplexType *CT = T->getAs<ComplexType>()) 3151 return getFloatingRank(CT->getElementType()); 3152 3153 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 3154 switch (T->getAs<BuiltinType>()->getKind()) { 3155 default: assert(0 && "getFloatingRank(): not a floating type"); 3156 case BuiltinType::Float: return FloatRank; 3157 case BuiltinType::Double: return DoubleRank; 3158 case BuiltinType::LongDouble: return LongDoubleRank; 3159 } 3160} 3161 3162/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 3163/// point or a complex type (based on typeDomain/typeSize). 3164/// 'typeDomain' is a real floating point or complex type. 3165/// 'typeSize' is a real floating point or complex type. 3166QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 3167 QualType Domain) const { 3168 FloatingRank EltRank = getFloatingRank(Size); 3169 if (Domain->isComplexType()) { 3170 switch (EltRank) { 3171 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3172 case FloatRank: return FloatComplexTy; 3173 case DoubleRank: return DoubleComplexTy; 3174 case LongDoubleRank: return LongDoubleComplexTy; 3175 } 3176 } 3177 3178 assert(Domain->isRealFloatingType() && "Unknown domain!"); 3179 switch (EltRank) { 3180 default: assert(0 && "getFloatingRank(): illegal value for rank"); 3181 case FloatRank: return FloatTy; 3182 case DoubleRank: return DoubleTy; 3183 case LongDoubleRank: return LongDoubleTy; 3184 } 3185} 3186 3187/// getFloatingTypeOrder - Compare the rank of the two specified floating 3188/// point types, ignoring the domain of the type (i.e. 'double' == 3189/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 3190/// LHS < RHS, return -1. 3191int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) const { 3192 FloatingRank LHSR = getFloatingRank(LHS); 3193 FloatingRank RHSR = getFloatingRank(RHS); 3194 3195 if (LHSR == RHSR) 3196 return 0; 3197 if (LHSR > RHSR) 3198 return 1; 3199 return -1; 3200} 3201 3202/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 3203/// routine will assert if passed a built-in type that isn't an integer or enum, 3204/// or if it is not canonicalized. 3205unsigned ASTContext::getIntegerRank(const Type *T) const { 3206 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 3207 if (const EnumType* ET = dyn_cast<EnumType>(T)) 3208 T = ET->getDecl()->getPromotionType().getTypePtr(); 3209 3210 if (T->isSpecificBuiltinType(BuiltinType::WChar_S) || 3211 T->isSpecificBuiltinType(BuiltinType::WChar_U)) 3212 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 3213 3214 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 3215 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 3216 3217 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 3218 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 3219 3220 switch (cast<BuiltinType>(T)->getKind()) { 3221 default: assert(0 && "getIntegerRank(): not a built-in integer"); 3222 case BuiltinType::Bool: 3223 return 1 + (getIntWidth(BoolTy) << 3); 3224 case BuiltinType::Char_S: 3225 case BuiltinType::Char_U: 3226 case BuiltinType::SChar: 3227 case BuiltinType::UChar: 3228 return 2 + (getIntWidth(CharTy) << 3); 3229 case BuiltinType::Short: 3230 case BuiltinType::UShort: 3231 return 3 + (getIntWidth(ShortTy) << 3); 3232 case BuiltinType::Int: 3233 case BuiltinType::UInt: 3234 return 4 + (getIntWidth(IntTy) << 3); 3235 case BuiltinType::Long: 3236 case BuiltinType::ULong: 3237 return 5 + (getIntWidth(LongTy) << 3); 3238 case BuiltinType::LongLong: 3239 case BuiltinType::ULongLong: 3240 return 6 + (getIntWidth(LongLongTy) << 3); 3241 case BuiltinType::Int128: 3242 case BuiltinType::UInt128: 3243 return 7 + (getIntWidth(Int128Ty) << 3); 3244 } 3245} 3246 3247/// \brief Whether this is a promotable bitfield reference according 3248/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 3249/// 3250/// \returns the type this bit-field will promote to, or NULL if no 3251/// promotion occurs. 3252QualType ASTContext::isPromotableBitField(Expr *E) const { 3253 if (E->isTypeDependent() || E->isValueDependent()) 3254 return QualType(); 3255 3256 FieldDecl *Field = E->getBitField(); 3257 if (!Field) 3258 return QualType(); 3259 3260 QualType FT = Field->getType(); 3261 3262 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 3263 uint64_t BitWidth = BitWidthAP.getZExtValue(); 3264 uint64_t IntSize = getTypeSize(IntTy); 3265 // GCC extension compatibility: if the bit-field size is less than or equal 3266 // to the size of int, it gets promoted no matter what its type is. 3267 // For instance, unsigned long bf : 4 gets promoted to signed int. 3268 if (BitWidth < IntSize) 3269 return IntTy; 3270 3271 if (BitWidth == IntSize) 3272 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 3273 3274 // Types bigger than int are not subject to promotions, and therefore act 3275 // like the base type. 3276 // FIXME: This doesn't quite match what gcc does, but what gcc does here 3277 // is ridiculous. 3278 return QualType(); 3279} 3280 3281/// getPromotedIntegerType - Returns the type that Promotable will 3282/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 3283/// integer type. 3284QualType ASTContext::getPromotedIntegerType(QualType Promotable) const { 3285 assert(!Promotable.isNull()); 3286 assert(Promotable->isPromotableIntegerType()); 3287 if (const EnumType *ET = Promotable->getAs<EnumType>()) 3288 return ET->getDecl()->getPromotionType(); 3289 if (Promotable->isSignedIntegerType()) 3290 return IntTy; 3291 uint64_t PromotableSize = getTypeSize(Promotable); 3292 uint64_t IntSize = getTypeSize(IntTy); 3293 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 3294 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 3295} 3296 3297/// getIntegerTypeOrder - Returns the highest ranked integer type: 3298/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 3299/// LHS < RHS, return -1. 3300int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) const { 3301 const Type *LHSC = getCanonicalType(LHS).getTypePtr(); 3302 const Type *RHSC = getCanonicalType(RHS).getTypePtr(); 3303 if (LHSC == RHSC) return 0; 3304 3305 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 3306 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 3307 3308 unsigned LHSRank = getIntegerRank(LHSC); 3309 unsigned RHSRank = getIntegerRank(RHSC); 3310 3311 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 3312 if (LHSRank == RHSRank) return 0; 3313 return LHSRank > RHSRank ? 1 : -1; 3314 } 3315 3316 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 3317 if (LHSUnsigned) { 3318 // If the unsigned [LHS] type is larger, return it. 3319 if (LHSRank >= RHSRank) 3320 return 1; 3321 3322 // If the signed type can represent all values of the unsigned type, it 3323 // wins. Because we are dealing with 2's complement and types that are 3324 // powers of two larger than each other, this is always safe. 3325 return -1; 3326 } 3327 3328 // If the unsigned [RHS] type is larger, return it. 3329 if (RHSRank >= LHSRank) 3330 return -1; 3331 3332 // If the signed type can represent all values of the unsigned type, it 3333 // wins. Because we are dealing with 2's complement and types that are 3334 // powers of two larger than each other, this is always safe. 3335 return 1; 3336} 3337 3338static RecordDecl * 3339CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK, DeclContext *DC, 3340 SourceLocation L, IdentifierInfo *Id) { 3341 if (Ctx.getLangOptions().CPlusPlus) 3342 return CXXRecordDecl::Create(Ctx, TK, DC, L, Id); 3343 else 3344 return RecordDecl::Create(Ctx, TK, DC, L, Id); 3345} 3346 3347// getCFConstantStringType - Return the type used for constant CFStrings. 3348QualType ASTContext::getCFConstantStringType() const { 3349 if (!CFConstantStringTypeDecl) { 3350 CFConstantStringTypeDecl = 3351 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3352 &Idents.get("NSConstantString")); 3353 CFConstantStringTypeDecl->startDefinition(); 3354 3355 QualType FieldTypes[4]; 3356 3357 // const int *isa; 3358 FieldTypes[0] = getPointerType(IntTy.withConst()); 3359 // int flags; 3360 FieldTypes[1] = IntTy; 3361 // const char *str; 3362 FieldTypes[2] = getPointerType(CharTy.withConst()); 3363 // long length; 3364 FieldTypes[3] = LongTy; 3365 3366 // Create fields 3367 for (unsigned i = 0; i < 4; ++i) { 3368 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 3369 SourceLocation(), 0, 3370 FieldTypes[i], /*TInfo=*/0, 3371 /*BitWidth=*/0, 3372 /*Mutable=*/false); 3373 Field->setAccess(AS_public); 3374 CFConstantStringTypeDecl->addDecl(Field); 3375 } 3376 3377 CFConstantStringTypeDecl->completeDefinition(); 3378 } 3379 3380 return getTagDeclType(CFConstantStringTypeDecl); 3381} 3382 3383void ASTContext::setCFConstantStringType(QualType T) { 3384 const RecordType *Rec = T->getAs<RecordType>(); 3385 assert(Rec && "Invalid CFConstantStringType"); 3386 CFConstantStringTypeDecl = Rec->getDecl(); 3387} 3388 3389// getNSConstantStringType - Return the type used for constant NSStrings. 3390QualType ASTContext::getNSConstantStringType() const { 3391 if (!NSConstantStringTypeDecl) { 3392 NSConstantStringTypeDecl = 3393 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3394 &Idents.get("__builtin_NSString")); 3395 NSConstantStringTypeDecl->startDefinition(); 3396 3397 QualType FieldTypes[3]; 3398 3399 // const int *isa; 3400 FieldTypes[0] = getPointerType(IntTy.withConst()); 3401 // const char *str; 3402 FieldTypes[1] = getPointerType(CharTy.withConst()); 3403 // unsigned int length; 3404 FieldTypes[2] = UnsignedIntTy; 3405 3406 // Create fields 3407 for (unsigned i = 0; i < 3; ++i) { 3408 FieldDecl *Field = FieldDecl::Create(*this, NSConstantStringTypeDecl, 3409 SourceLocation(), 0, 3410 FieldTypes[i], /*TInfo=*/0, 3411 /*BitWidth=*/0, 3412 /*Mutable=*/false); 3413 Field->setAccess(AS_public); 3414 NSConstantStringTypeDecl->addDecl(Field); 3415 } 3416 3417 NSConstantStringTypeDecl->completeDefinition(); 3418 } 3419 3420 return getTagDeclType(NSConstantStringTypeDecl); 3421} 3422 3423void ASTContext::setNSConstantStringType(QualType T) { 3424 const RecordType *Rec = T->getAs<RecordType>(); 3425 assert(Rec && "Invalid NSConstantStringType"); 3426 NSConstantStringTypeDecl = Rec->getDecl(); 3427} 3428 3429QualType ASTContext::getObjCFastEnumerationStateType() const { 3430 if (!ObjCFastEnumerationStateTypeDecl) { 3431 ObjCFastEnumerationStateTypeDecl = 3432 CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3433 &Idents.get("__objcFastEnumerationState")); 3434 ObjCFastEnumerationStateTypeDecl->startDefinition(); 3435 3436 QualType FieldTypes[] = { 3437 UnsignedLongTy, 3438 getPointerType(ObjCIdTypedefType), 3439 getPointerType(UnsignedLongTy), 3440 getConstantArrayType(UnsignedLongTy, 3441 llvm::APInt(32, 5), ArrayType::Normal, 0) 3442 }; 3443 3444 for (size_t i = 0; i < 4; ++i) { 3445 FieldDecl *Field = FieldDecl::Create(*this, 3446 ObjCFastEnumerationStateTypeDecl, 3447 SourceLocation(), 0, 3448 FieldTypes[i], /*TInfo=*/0, 3449 /*BitWidth=*/0, 3450 /*Mutable=*/false); 3451 Field->setAccess(AS_public); 3452 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 3453 } 3454 3455 ObjCFastEnumerationStateTypeDecl->completeDefinition(); 3456 } 3457 3458 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 3459} 3460 3461QualType ASTContext::getBlockDescriptorType() const { 3462 if (BlockDescriptorType) 3463 return getTagDeclType(BlockDescriptorType); 3464 3465 RecordDecl *T; 3466 // FIXME: Needs the FlagAppleBlock bit. 3467 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3468 &Idents.get("__block_descriptor")); 3469 T->startDefinition(); 3470 3471 QualType FieldTypes[] = { 3472 UnsignedLongTy, 3473 UnsignedLongTy, 3474 }; 3475 3476 const char *FieldNames[] = { 3477 "reserved", 3478 "Size" 3479 }; 3480 3481 for (size_t i = 0; i < 2; ++i) { 3482 FieldDecl *Field = FieldDecl::Create(*this, 3483 T, 3484 SourceLocation(), 3485 &Idents.get(FieldNames[i]), 3486 FieldTypes[i], /*TInfo=*/0, 3487 /*BitWidth=*/0, 3488 /*Mutable=*/false); 3489 Field->setAccess(AS_public); 3490 T->addDecl(Field); 3491 } 3492 3493 T->completeDefinition(); 3494 3495 BlockDescriptorType = T; 3496 3497 return getTagDeclType(BlockDescriptorType); 3498} 3499 3500void ASTContext::setBlockDescriptorType(QualType T) { 3501 const RecordType *Rec = T->getAs<RecordType>(); 3502 assert(Rec && "Invalid BlockDescriptorType"); 3503 BlockDescriptorType = Rec->getDecl(); 3504} 3505 3506QualType ASTContext::getBlockDescriptorExtendedType() const { 3507 if (BlockDescriptorExtendedType) 3508 return getTagDeclType(BlockDescriptorExtendedType); 3509 3510 RecordDecl *T; 3511 // FIXME: Needs the FlagAppleBlock bit. 3512 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3513 &Idents.get("__block_descriptor_withcopydispose")); 3514 T->startDefinition(); 3515 3516 QualType FieldTypes[] = { 3517 UnsignedLongTy, 3518 UnsignedLongTy, 3519 getPointerType(VoidPtrTy), 3520 getPointerType(VoidPtrTy) 3521 }; 3522 3523 const char *FieldNames[] = { 3524 "reserved", 3525 "Size", 3526 "CopyFuncPtr", 3527 "DestroyFuncPtr" 3528 }; 3529 3530 for (size_t i = 0; i < 4; ++i) { 3531 FieldDecl *Field = FieldDecl::Create(*this, 3532 T, 3533 SourceLocation(), 3534 &Idents.get(FieldNames[i]), 3535 FieldTypes[i], /*TInfo=*/0, 3536 /*BitWidth=*/0, 3537 /*Mutable=*/false); 3538 Field->setAccess(AS_public); 3539 T->addDecl(Field); 3540 } 3541 3542 T->completeDefinition(); 3543 3544 BlockDescriptorExtendedType = T; 3545 3546 return getTagDeclType(BlockDescriptorExtendedType); 3547} 3548 3549void ASTContext::setBlockDescriptorExtendedType(QualType T) { 3550 const RecordType *Rec = T->getAs<RecordType>(); 3551 assert(Rec && "Invalid BlockDescriptorType"); 3552 BlockDescriptorExtendedType = Rec->getDecl(); 3553} 3554 3555bool ASTContext::BlockRequiresCopying(QualType Ty) const { 3556 if (Ty->isBlockPointerType()) 3557 return true; 3558 if (isObjCNSObjectType(Ty)) 3559 return true; 3560 if (Ty->isObjCObjectPointerType()) 3561 return true; 3562 if (getLangOptions().CPlusPlus) { 3563 if (const RecordType *RT = Ty->getAs<RecordType>()) { 3564 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3565 return RD->hasConstCopyConstructor(*this); 3566 3567 } 3568 } 3569 return false; 3570} 3571 3572QualType 3573ASTContext::BuildByRefType(llvm::StringRef DeclName, QualType Ty) const { 3574 // type = struct __Block_byref_1_X { 3575 // void *__isa; 3576 // struct __Block_byref_1_X *__forwarding; 3577 // unsigned int __flags; 3578 // unsigned int __size; 3579 // void *__copy_helper; // as needed 3580 // void *__destroy_help // as needed 3581 // int X; 3582 // } * 3583 3584 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 3585 3586 // FIXME: Move up 3587 llvm::SmallString<36> Name; 3588 llvm::raw_svector_ostream(Name) << "__Block_byref_" << 3589 ++UniqueBlockByRefTypeID << '_' << DeclName; 3590 RecordDecl *T; 3591 T = CreateRecordDecl(*this, TTK_Struct, TUDecl, SourceLocation(), 3592 &Idents.get(Name.str())); 3593 T->startDefinition(); 3594 QualType Int32Ty = IntTy; 3595 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 3596 QualType FieldTypes[] = { 3597 getPointerType(VoidPtrTy), 3598 getPointerType(getTagDeclType(T)), 3599 Int32Ty, 3600 Int32Ty, 3601 getPointerType(VoidPtrTy), 3602 getPointerType(VoidPtrTy), 3603 Ty 3604 }; 3605 3606 llvm::StringRef FieldNames[] = { 3607 "__isa", 3608 "__forwarding", 3609 "__flags", 3610 "__size", 3611 "__copy_helper", 3612 "__destroy_helper", 3613 DeclName, 3614 }; 3615 3616 for (size_t i = 0; i < 7; ++i) { 3617 if (!HasCopyAndDispose && i >=4 && i <= 5) 3618 continue; 3619 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 3620 &Idents.get(FieldNames[i]), 3621 FieldTypes[i], /*TInfo=*/0, 3622 /*BitWidth=*/0, /*Mutable=*/false); 3623 Field->setAccess(AS_public); 3624 T->addDecl(Field); 3625 } 3626 3627 T->completeDefinition(); 3628 3629 return getPointerType(getTagDeclType(T)); 3630} 3631 3632void ASTContext::setObjCFastEnumerationStateType(QualType T) { 3633 const RecordType *Rec = T->getAs<RecordType>(); 3634 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 3635 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 3636} 3637 3638// This returns true if a type has been typedefed to BOOL: 3639// typedef <type> BOOL; 3640static bool isTypeTypedefedAsBOOL(QualType T) { 3641 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 3642 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 3643 return II->isStr("BOOL"); 3644 3645 return false; 3646} 3647 3648/// getObjCEncodingTypeSize returns size of type for objective-c encoding 3649/// purpose. 3650CharUnits ASTContext::getObjCEncodingTypeSize(QualType type) const { 3651 CharUnits sz = getTypeSizeInChars(type); 3652 3653 // Make all integer and enum types at least as large as an int 3654 if (sz.isPositive() && type->isIntegralOrEnumerationType()) 3655 sz = std::max(sz, getTypeSizeInChars(IntTy)); 3656 // Treat arrays as pointers, since that's how they're passed in. 3657 else if (type->isArrayType()) 3658 sz = getTypeSizeInChars(VoidPtrTy); 3659 return sz; 3660} 3661 3662static inline 3663std::string charUnitsToString(const CharUnits &CU) { 3664 return llvm::itostr(CU.getQuantity()); 3665} 3666 3667/// getObjCEncodingForBlock - Return the encoded type for this block 3668/// declaration. 3669std::string ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr) const { 3670 std::string S; 3671 3672 const BlockDecl *Decl = Expr->getBlockDecl(); 3673 QualType BlockTy = 3674 Expr->getType()->getAs<BlockPointerType>()->getPointeeType(); 3675 // Encode result type. 3676 getObjCEncodingForType(BlockTy->getAs<FunctionType>()->getResultType(), S); 3677 // Compute size of all parameters. 3678 // Start with computing size of a pointer in number of bytes. 3679 // FIXME: There might(should) be a better way of doing this computation! 3680 SourceLocation Loc; 3681 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3682 CharUnits ParmOffset = PtrSize; 3683 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), 3684 E = Decl->param_end(); PI != E; ++PI) { 3685 QualType PType = (*PI)->getType(); 3686 CharUnits sz = getObjCEncodingTypeSize(PType); 3687 assert (sz.isPositive() && "BlockExpr - Incomplete param type"); 3688 ParmOffset += sz; 3689 } 3690 // Size of the argument frame 3691 S += charUnitsToString(ParmOffset); 3692 // Block pointer and offset. 3693 S += "@?0"; 3694 ParmOffset = PtrSize; 3695 3696 // Argument types. 3697 ParmOffset = PtrSize; 3698 for (BlockDecl::param_const_iterator PI = Decl->param_begin(), E = 3699 Decl->param_end(); PI != E; ++PI) { 3700 ParmVarDecl *PVDecl = *PI; 3701 QualType PType = PVDecl->getOriginalType(); 3702 if (const ArrayType *AT = 3703 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3704 // Use array's original type only if it has known number of 3705 // elements. 3706 if (!isa<ConstantArrayType>(AT)) 3707 PType = PVDecl->getType(); 3708 } else if (PType->isFunctionType()) 3709 PType = PVDecl->getType(); 3710 getObjCEncodingForType(PType, S); 3711 S += charUnitsToString(ParmOffset); 3712 ParmOffset += getObjCEncodingTypeSize(PType); 3713 } 3714 3715 return S; 3716} 3717 3718void ASTContext::getObjCEncodingForFunctionDecl(const FunctionDecl *Decl, 3719 std::string& S) { 3720 // Encode result type. 3721 getObjCEncodingForType(Decl->getResultType(), S); 3722 CharUnits ParmOffset; 3723 // Compute size of all parameters. 3724 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3725 E = Decl->param_end(); PI != E; ++PI) { 3726 QualType PType = (*PI)->getType(); 3727 CharUnits sz = getObjCEncodingTypeSize(PType); 3728 assert (sz.isPositive() && 3729 "getObjCEncodingForMethodDecl - Incomplete param type"); 3730 ParmOffset += sz; 3731 } 3732 S += charUnitsToString(ParmOffset); 3733 ParmOffset = CharUnits::Zero(); 3734 3735 // Argument types. 3736 for (FunctionDecl::param_const_iterator PI = Decl->param_begin(), 3737 E = Decl->param_end(); PI != E; ++PI) { 3738 ParmVarDecl *PVDecl = *PI; 3739 QualType PType = PVDecl->getOriginalType(); 3740 if (const ArrayType *AT = 3741 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3742 // Use array's original type only if it has known number of 3743 // elements. 3744 if (!isa<ConstantArrayType>(AT)) 3745 PType = PVDecl->getType(); 3746 } else if (PType->isFunctionType()) 3747 PType = PVDecl->getType(); 3748 getObjCEncodingForType(PType, S); 3749 S += charUnitsToString(ParmOffset); 3750 ParmOffset += getObjCEncodingTypeSize(PType); 3751 } 3752} 3753 3754/// getObjCEncodingForMethodDecl - Return the encoded type for this method 3755/// declaration. 3756void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 3757 std::string& S) const { 3758 // FIXME: This is not very efficient. 3759 // Encode type qualifer, 'in', 'inout', etc. for the return type. 3760 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 3761 // Encode result type. 3762 getObjCEncodingForType(Decl->getResultType(), S); 3763 // Compute size of all parameters. 3764 // Start with computing size of a pointer in number of bytes. 3765 // FIXME: There might(should) be a better way of doing this computation! 3766 SourceLocation Loc; 3767 CharUnits PtrSize = getTypeSizeInChars(VoidPtrTy); 3768 // The first two arguments (self and _cmd) are pointers; account for 3769 // their size. 3770 CharUnits ParmOffset = 2 * PtrSize; 3771 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3772 E = Decl->sel_param_end(); PI != E; ++PI) { 3773 QualType PType = (*PI)->getType(); 3774 CharUnits sz = getObjCEncodingTypeSize(PType); 3775 assert (sz.isPositive() && 3776 "getObjCEncodingForMethodDecl - Incomplete param type"); 3777 ParmOffset += sz; 3778 } 3779 S += charUnitsToString(ParmOffset); 3780 S += "@0:"; 3781 S += charUnitsToString(PtrSize); 3782 3783 // Argument types. 3784 ParmOffset = 2 * PtrSize; 3785 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 3786 E = Decl->sel_param_end(); PI != E; ++PI) { 3787 ParmVarDecl *PVDecl = *PI; 3788 QualType PType = PVDecl->getOriginalType(); 3789 if (const ArrayType *AT = 3790 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 3791 // Use array's original type only if it has known number of 3792 // elements. 3793 if (!isa<ConstantArrayType>(AT)) 3794 PType = PVDecl->getType(); 3795 } else if (PType->isFunctionType()) 3796 PType = PVDecl->getType(); 3797 // Process argument qualifiers for user supplied arguments; such as, 3798 // 'in', 'inout', etc. 3799 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 3800 getObjCEncodingForType(PType, S); 3801 S += charUnitsToString(ParmOffset); 3802 ParmOffset += getObjCEncodingTypeSize(PType); 3803 } 3804} 3805 3806/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3807/// property declaration. If non-NULL, Container must be either an 3808/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3809/// NULL when getting encodings for protocol properties. 3810/// Property attributes are stored as a comma-delimited C string. The simple 3811/// attributes readonly and bycopy are encoded as single characters. The 3812/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3813/// encoded as single characters, followed by an identifier. Property types 3814/// are also encoded as a parametrized attribute. The characters used to encode 3815/// these attributes are defined by the following enumeration: 3816/// @code 3817/// enum PropertyAttributes { 3818/// kPropertyReadOnly = 'R', // property is read-only. 3819/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3820/// kPropertyByref = '&', // property is a reference to the value last assigned 3821/// kPropertyDynamic = 'D', // property is dynamic 3822/// kPropertyGetter = 'G', // followed by getter selector name 3823/// kPropertySetter = 'S', // followed by setter selector name 3824/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3825/// kPropertyType = 't' // followed by old-style type encoding. 3826/// kPropertyWeak = 'W' // 'weak' property 3827/// kPropertyStrong = 'P' // property GC'able 3828/// kPropertyNonAtomic = 'N' // property non-atomic 3829/// }; 3830/// @endcode 3831void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3832 const Decl *Container, 3833 std::string& S) const { 3834 // Collect information from the property implementation decl(s). 3835 bool Dynamic = false; 3836 ObjCPropertyImplDecl *SynthesizePID = 0; 3837 3838 // FIXME: Duplicated code due to poor abstraction. 3839 if (Container) { 3840 if (const ObjCCategoryImplDecl *CID = 3841 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3842 for (ObjCCategoryImplDecl::propimpl_iterator 3843 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3844 i != e; ++i) { 3845 ObjCPropertyImplDecl *PID = *i; 3846 if (PID->getPropertyDecl() == PD) { 3847 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3848 Dynamic = true; 3849 } else { 3850 SynthesizePID = PID; 3851 } 3852 } 3853 } 3854 } else { 3855 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3856 for (ObjCCategoryImplDecl::propimpl_iterator 3857 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3858 i != e; ++i) { 3859 ObjCPropertyImplDecl *PID = *i; 3860 if (PID->getPropertyDecl() == PD) { 3861 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3862 Dynamic = true; 3863 } else { 3864 SynthesizePID = PID; 3865 } 3866 } 3867 } 3868 } 3869 } 3870 3871 // FIXME: This is not very efficient. 3872 S = "T"; 3873 3874 // Encode result type. 3875 // GCC has some special rules regarding encoding of properties which 3876 // closely resembles encoding of ivars. 3877 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3878 true /* outermost type */, 3879 true /* encoding for property */); 3880 3881 if (PD->isReadOnly()) { 3882 S += ",R"; 3883 } else { 3884 switch (PD->getSetterKind()) { 3885 case ObjCPropertyDecl::Assign: break; 3886 case ObjCPropertyDecl::Copy: S += ",C"; break; 3887 case ObjCPropertyDecl::Retain: S += ",&"; break; 3888 } 3889 } 3890 3891 // It really isn't clear at all what this means, since properties 3892 // are "dynamic by default". 3893 if (Dynamic) 3894 S += ",D"; 3895 3896 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3897 S += ",N"; 3898 3899 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3900 S += ",G"; 3901 S += PD->getGetterName().getAsString(); 3902 } 3903 3904 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3905 S += ",S"; 3906 S += PD->getSetterName().getAsString(); 3907 } 3908 3909 if (SynthesizePID) { 3910 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3911 S += ",V"; 3912 S += OID->getNameAsString(); 3913 } 3914 3915 // FIXME: OBJCGC: weak & strong 3916} 3917 3918/// getLegacyIntegralTypeEncoding - 3919/// Another legacy compatibility encoding: 32-bit longs are encoded as 3920/// 'l' or 'L' , but not always. For typedefs, we need to use 3921/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3922/// 3923void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3924 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3925 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3926 if (BT->getKind() == BuiltinType::ULong && getIntWidth(PointeeTy) == 32) 3927 PointeeTy = UnsignedIntTy; 3928 else 3929 if (BT->getKind() == BuiltinType::Long && getIntWidth(PointeeTy) == 32) 3930 PointeeTy = IntTy; 3931 } 3932 } 3933} 3934 3935void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3936 const FieldDecl *Field) const { 3937 // We follow the behavior of gcc, expanding structures which are 3938 // directly pointed to, and expanding embedded structures. Note that 3939 // these rules are sufficient to prevent recursive encoding of the 3940 // same type. 3941 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3942 true /* outermost type */); 3943} 3944 3945static char ObjCEncodingForPrimitiveKind(const ASTContext *C, QualType T) { 3946 switch (T->getAs<BuiltinType>()->getKind()) { 3947 default: assert(0 && "Unhandled builtin type kind"); 3948 case BuiltinType::Void: return 'v'; 3949 case BuiltinType::Bool: return 'B'; 3950 case BuiltinType::Char_U: 3951 case BuiltinType::UChar: return 'C'; 3952 case BuiltinType::UShort: return 'S'; 3953 case BuiltinType::UInt: return 'I'; 3954 case BuiltinType::ULong: 3955 return C->getIntWidth(T) == 32 ? 'L' : 'Q'; 3956 case BuiltinType::UInt128: return 'T'; 3957 case BuiltinType::ULongLong: return 'Q'; 3958 case BuiltinType::Char_S: 3959 case BuiltinType::SChar: return 'c'; 3960 case BuiltinType::Short: return 's'; 3961 case BuiltinType::WChar_S: 3962 case BuiltinType::WChar_U: 3963 case BuiltinType::Int: return 'i'; 3964 case BuiltinType::Long: 3965 return C->getIntWidth(T) == 32 ? 'l' : 'q'; 3966 case BuiltinType::LongLong: return 'q'; 3967 case BuiltinType::Int128: return 't'; 3968 case BuiltinType::Float: return 'f'; 3969 case BuiltinType::Double: return 'd'; 3970 case BuiltinType::LongDouble: return 'D'; 3971 } 3972} 3973 3974static void EncodeBitField(const ASTContext *Ctx, std::string& S, 3975 QualType T, const FieldDecl *FD) { 3976 const Expr *E = FD->getBitWidth(); 3977 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3978 S += 'b'; 3979 // The NeXT runtime encodes bit fields as b followed by the number of bits. 3980 // The GNU runtime requires more information; bitfields are encoded as b, 3981 // then the offset (in bits) of the first element, then the type of the 3982 // bitfield, then the size in bits. For example, in this structure: 3983 // 3984 // struct 3985 // { 3986 // int integer; 3987 // int flags:2; 3988 // }; 3989 // On a 32-bit system, the encoding for flags would be b2 for the NeXT 3990 // runtime, but b32i2 for the GNU runtime. The reason for this extra 3991 // information is not especially sensible, but we're stuck with it for 3992 // compatibility with GCC, although providing it breaks anything that 3993 // actually uses runtime introspection and wants to work on both runtimes... 3994 if (!Ctx->getLangOptions().NeXTRuntime) { 3995 const RecordDecl *RD = FD->getParent(); 3996 const ASTRecordLayout &RL = Ctx->getASTRecordLayout(RD); 3997 // FIXME: This same linear search is also used in ExprConstant - it might 3998 // be better if the FieldDecl stored its offset. We'd be increasing the 3999 // size of the object slightly, but saving some time every time it is used. 4000 unsigned i = 0; 4001 for (RecordDecl::field_iterator Field = RD->field_begin(), 4002 FieldEnd = RD->field_end(); 4003 Field != FieldEnd; (void)++Field, ++i) { 4004 if (*Field == FD) 4005 break; 4006 } 4007 S += llvm::utostr(RL.getFieldOffset(i)); 4008 if (T->isEnumeralType()) 4009 S += 'i'; 4010 else 4011 S += ObjCEncodingForPrimitiveKind(Ctx, T); 4012 } 4013 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 4014 S += llvm::utostr(N); 4015} 4016 4017// FIXME: Use SmallString for accumulating string. 4018void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 4019 bool ExpandPointedToStructures, 4020 bool ExpandStructures, 4021 const FieldDecl *FD, 4022 bool OutermostType, 4023 bool EncodingProperty) const { 4024 if (T->getAs<BuiltinType>()) { 4025 if (FD && FD->isBitField()) 4026 return EncodeBitField(this, S, T, FD); 4027 S += ObjCEncodingForPrimitiveKind(this, T); 4028 return; 4029 } 4030 4031 if (const ComplexType *CT = T->getAs<ComplexType>()) { 4032 S += 'j'; 4033 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 4034 false); 4035 return; 4036 } 4037 4038 // encoding for pointer or r3eference types. 4039 QualType PointeeTy; 4040 if (const PointerType *PT = T->getAs<PointerType>()) { 4041 if (PT->isObjCSelType()) { 4042 S += ':'; 4043 return; 4044 } 4045 PointeeTy = PT->getPointeeType(); 4046 } 4047 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 4048 PointeeTy = RT->getPointeeType(); 4049 if (!PointeeTy.isNull()) { 4050 bool isReadOnly = false; 4051 // For historical/compatibility reasons, the read-only qualifier of the 4052 // pointee gets emitted _before_ the '^'. The read-only qualifier of 4053 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 4054 // Also, do not emit the 'r' for anything but the outermost type! 4055 if (isa<TypedefType>(T.getTypePtr())) { 4056 if (OutermostType && T.isConstQualified()) { 4057 isReadOnly = true; 4058 S += 'r'; 4059 } 4060 } else if (OutermostType) { 4061 QualType P = PointeeTy; 4062 while (P->getAs<PointerType>()) 4063 P = P->getAs<PointerType>()->getPointeeType(); 4064 if (P.isConstQualified()) { 4065 isReadOnly = true; 4066 S += 'r'; 4067 } 4068 } 4069 if (isReadOnly) { 4070 // Another legacy compatibility encoding. Some ObjC qualifier and type 4071 // combinations need to be rearranged. 4072 // Rewrite "in const" from "nr" to "rn" 4073 if (llvm::StringRef(S).endswith("nr")) 4074 S.replace(S.end()-2, S.end(), "rn"); 4075 } 4076 4077 if (PointeeTy->isCharType()) { 4078 // char pointer types should be encoded as '*' unless it is a 4079 // type that has been typedef'd to 'BOOL'. 4080 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 4081 S += '*'; 4082 return; 4083 } 4084 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 4085 // GCC binary compat: Need to convert "struct objc_class *" to "#". 4086 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 4087 S += '#'; 4088 return; 4089 } 4090 // GCC binary compat: Need to convert "struct objc_object *" to "@". 4091 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 4092 S += '@'; 4093 return; 4094 } 4095 // fall through... 4096 } 4097 S += '^'; 4098 getLegacyIntegralTypeEncoding(PointeeTy); 4099 4100 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 4101 NULL); 4102 return; 4103 } 4104 4105 if (const ArrayType *AT = 4106 // Ignore type qualifiers etc. 4107 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 4108 if (isa<IncompleteArrayType>(AT)) { 4109 // Incomplete arrays are encoded as a pointer to the array element. 4110 S += '^'; 4111 4112 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4113 false, ExpandStructures, FD); 4114 } else { 4115 S += '['; 4116 4117 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 4118 S += llvm::utostr(CAT->getSize().getZExtValue()); 4119 else { 4120 //Variable length arrays are encoded as a regular array with 0 elements. 4121 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 4122 S += '0'; 4123 } 4124 4125 getObjCEncodingForTypeImpl(AT->getElementType(), S, 4126 false, ExpandStructures, FD); 4127 S += ']'; 4128 } 4129 return; 4130 } 4131 4132 if (T->getAs<FunctionType>()) { 4133 S += '?'; 4134 return; 4135 } 4136 4137 if (const RecordType *RTy = T->getAs<RecordType>()) { 4138 RecordDecl *RDecl = RTy->getDecl(); 4139 S += RDecl->isUnion() ? '(' : '{'; 4140 // Anonymous structures print as '?' 4141 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 4142 S += II->getName(); 4143 if (ClassTemplateSpecializationDecl *Spec 4144 = dyn_cast<ClassTemplateSpecializationDecl>(RDecl)) { 4145 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 4146 std::string TemplateArgsStr 4147 = TemplateSpecializationType::PrintTemplateArgumentList( 4148 TemplateArgs.data(), 4149 TemplateArgs.size(), 4150 (*this).PrintingPolicy); 4151 4152 S += TemplateArgsStr; 4153 } 4154 } else { 4155 S += '?'; 4156 } 4157 if (ExpandStructures) { 4158 S += '='; 4159 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 4160 FieldEnd = RDecl->field_end(); 4161 Field != FieldEnd; ++Field) { 4162 if (FD) { 4163 S += '"'; 4164 S += Field->getNameAsString(); 4165 S += '"'; 4166 } 4167 4168 // Special case bit-fields. 4169 if (Field->isBitField()) { 4170 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 4171 (*Field)); 4172 } else { 4173 QualType qt = Field->getType(); 4174 getLegacyIntegralTypeEncoding(qt); 4175 getObjCEncodingForTypeImpl(qt, S, false, true, 4176 FD); 4177 } 4178 } 4179 } 4180 S += RDecl->isUnion() ? ')' : '}'; 4181 return; 4182 } 4183 4184 if (T->isEnumeralType()) { 4185 if (FD && FD->isBitField()) 4186 EncodeBitField(this, S, T, FD); 4187 else 4188 S += 'i'; 4189 return; 4190 } 4191 4192 if (T->isBlockPointerType()) { 4193 S += "@?"; // Unlike a pointer-to-function, which is "^?". 4194 return; 4195 } 4196 4197 // Ignore protocol qualifiers when mangling at this level. 4198 if (const ObjCObjectType *OT = T->getAs<ObjCObjectType>()) 4199 T = OT->getBaseType(); 4200 4201 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 4202 // @encode(class_name) 4203 ObjCInterfaceDecl *OI = OIT->getDecl(); 4204 S += '{'; 4205 const IdentifierInfo *II = OI->getIdentifier(); 4206 S += II->getName(); 4207 S += '='; 4208 llvm::SmallVector<ObjCIvarDecl*, 32> Ivars; 4209 DeepCollectObjCIvars(OI, true, Ivars); 4210 for (unsigned i = 0, e = Ivars.size(); i != e; ++i) { 4211 FieldDecl *Field = cast<FieldDecl>(Ivars[i]); 4212 if (Field->isBitField()) 4213 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, Field); 4214 else 4215 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, FD); 4216 } 4217 S += '}'; 4218 return; 4219 } 4220 4221 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 4222 if (OPT->isObjCIdType()) { 4223 S += '@'; 4224 return; 4225 } 4226 4227 if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) { 4228 // FIXME: Consider if we need to output qualifiers for 'Class<p>'. 4229 // Since this is a binary compatibility issue, need to consult with runtime 4230 // folks. Fortunately, this is a *very* obsure construct. 4231 S += '#'; 4232 return; 4233 } 4234 4235 if (OPT->isObjCQualifiedIdType()) { 4236 getObjCEncodingForTypeImpl(getObjCIdType(), S, 4237 ExpandPointedToStructures, 4238 ExpandStructures, FD); 4239 if (FD || EncodingProperty) { 4240 // Note that we do extended encoding of protocol qualifer list 4241 // Only when doing ivar or property encoding. 4242 S += '"'; 4243 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4244 E = OPT->qual_end(); I != E; ++I) { 4245 S += '<'; 4246 S += (*I)->getNameAsString(); 4247 S += '>'; 4248 } 4249 S += '"'; 4250 } 4251 return; 4252 } 4253 4254 QualType PointeeTy = OPT->getPointeeType(); 4255 if (!EncodingProperty && 4256 isa<TypedefType>(PointeeTy.getTypePtr())) { 4257 // Another historical/compatibility reason. 4258 // We encode the underlying type which comes out as 4259 // {...}; 4260 S += '^'; 4261 getObjCEncodingForTypeImpl(PointeeTy, S, 4262 false, ExpandPointedToStructures, 4263 NULL); 4264 return; 4265 } 4266 4267 S += '@'; 4268 if (OPT->getInterfaceDecl() && (FD || EncodingProperty)) { 4269 S += '"'; 4270 S += OPT->getInterfaceDecl()->getIdentifier()->getName(); 4271 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 4272 E = OPT->qual_end(); I != E; ++I) { 4273 S += '<'; 4274 S += (*I)->getNameAsString(); 4275 S += '>'; 4276 } 4277 S += '"'; 4278 } 4279 return; 4280 } 4281 4282 // gcc just blithely ignores member pointers. 4283 // TODO: maybe there should be a mangling for these 4284 if (T->getAs<MemberPointerType>()) 4285 return; 4286 4287 if (T->isVectorType()) { 4288 // This matches gcc's encoding, even though technically it is 4289 // insufficient. 4290 // FIXME. We should do a better job than gcc. 4291 return; 4292 } 4293 4294 assert(0 && "@encode for type not implemented!"); 4295} 4296 4297void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 4298 std::string& S) const { 4299 if (QT & Decl::OBJC_TQ_In) 4300 S += 'n'; 4301 if (QT & Decl::OBJC_TQ_Inout) 4302 S += 'N'; 4303 if (QT & Decl::OBJC_TQ_Out) 4304 S += 'o'; 4305 if (QT & Decl::OBJC_TQ_Bycopy) 4306 S += 'O'; 4307 if (QT & Decl::OBJC_TQ_Byref) 4308 S += 'R'; 4309 if (QT & Decl::OBJC_TQ_Oneway) 4310 S += 'V'; 4311} 4312 4313void ASTContext::setBuiltinVaListType(QualType T) { 4314 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 4315 4316 BuiltinVaListType = T; 4317} 4318 4319void ASTContext::setObjCIdType(QualType T) { 4320 ObjCIdTypedefType = T; 4321} 4322 4323void ASTContext::setObjCSelType(QualType T) { 4324 ObjCSelTypedefType = T; 4325} 4326 4327void ASTContext::setObjCProtoType(QualType QT) { 4328 ObjCProtoType = QT; 4329} 4330 4331void ASTContext::setObjCClassType(QualType T) { 4332 ObjCClassTypedefType = T; 4333} 4334 4335void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 4336 assert(ObjCConstantStringType.isNull() && 4337 "'NSConstantString' type already set!"); 4338 4339 ObjCConstantStringType = getObjCInterfaceType(Decl); 4340} 4341 4342/// \brief Retrieve the template name that corresponds to a non-empty 4343/// lookup. 4344TemplateName 4345ASTContext::getOverloadedTemplateName(UnresolvedSetIterator Begin, 4346 UnresolvedSetIterator End) const { 4347 unsigned size = End - Begin; 4348 assert(size > 1 && "set is not overloaded!"); 4349 4350 void *memory = Allocate(sizeof(OverloadedTemplateStorage) + 4351 size * sizeof(FunctionTemplateDecl*)); 4352 OverloadedTemplateStorage *OT = new(memory) OverloadedTemplateStorage(size); 4353 4354 NamedDecl **Storage = OT->getStorage(); 4355 for (UnresolvedSetIterator I = Begin; I != End; ++I) { 4356 NamedDecl *D = *I; 4357 assert(isa<FunctionTemplateDecl>(D) || 4358 (isa<UsingShadowDecl>(D) && 4359 isa<FunctionTemplateDecl>(D->getUnderlyingDecl()))); 4360 *Storage++ = D; 4361 } 4362 4363 return TemplateName(OT); 4364} 4365 4366/// \brief Retrieve the template name that represents a qualified 4367/// template name such as \c std::vector. 4368TemplateName 4369ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 4370 bool TemplateKeyword, 4371 TemplateDecl *Template) const { 4372 // FIXME: Canonicalization? 4373 llvm::FoldingSetNodeID ID; 4374 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 4375 4376 void *InsertPos = 0; 4377 QualifiedTemplateName *QTN = 4378 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4379 if (!QTN) { 4380 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 4381 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 4382 } 4383 4384 return TemplateName(QTN); 4385} 4386 4387/// \brief Retrieve the template name that represents a dependent 4388/// template name such as \c MetaFun::template apply. 4389TemplateName 4390ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4391 const IdentifierInfo *Name) const { 4392 assert((!NNS || NNS->isDependent()) && 4393 "Nested name specifier must be dependent"); 4394 4395 llvm::FoldingSetNodeID ID; 4396 DependentTemplateName::Profile(ID, NNS, Name); 4397 4398 void *InsertPos = 0; 4399 DependentTemplateName *QTN = 4400 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4401 4402 if (QTN) 4403 return TemplateName(QTN); 4404 4405 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4406 if (CanonNNS == NNS) { 4407 QTN = new (*this,4) DependentTemplateName(NNS, Name); 4408 } else { 4409 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 4410 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 4411 DependentTemplateName *CheckQTN = 4412 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4413 assert(!CheckQTN && "Dependent type name canonicalization broken"); 4414 (void)CheckQTN; 4415 } 4416 4417 DependentTemplateNames.InsertNode(QTN, InsertPos); 4418 return TemplateName(QTN); 4419} 4420 4421/// \brief Retrieve the template name that represents a dependent 4422/// template name such as \c MetaFun::template operator+. 4423TemplateName 4424ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 4425 OverloadedOperatorKind Operator) const { 4426 assert((!NNS || NNS->isDependent()) && 4427 "Nested name specifier must be dependent"); 4428 4429 llvm::FoldingSetNodeID ID; 4430 DependentTemplateName::Profile(ID, NNS, Operator); 4431 4432 void *InsertPos = 0; 4433 DependentTemplateName *QTN 4434 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4435 4436 if (QTN) 4437 return TemplateName(QTN); 4438 4439 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 4440 if (CanonNNS == NNS) { 4441 QTN = new (*this,4) DependentTemplateName(NNS, Operator); 4442 } else { 4443 TemplateName Canon = getDependentTemplateName(CanonNNS, Operator); 4444 QTN = new (*this,4) DependentTemplateName(NNS, Operator, Canon); 4445 4446 DependentTemplateName *CheckQTN 4447 = DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 4448 assert(!CheckQTN && "Dependent template name canonicalization broken"); 4449 (void)CheckQTN; 4450 } 4451 4452 DependentTemplateNames.InsertNode(QTN, InsertPos); 4453 return TemplateName(QTN); 4454} 4455 4456TemplateName 4457ASTContext::getSubstTemplateTemplateParmPack(TemplateTemplateParmDecl *Param, 4458 const TemplateArgument &ArgPack) const { 4459 ASTContext &Self = const_cast<ASTContext &>(*this); 4460 llvm::FoldingSetNodeID ID; 4461 SubstTemplateTemplateParmPackStorage::Profile(ID, Self, Param, ArgPack); 4462 4463 void *InsertPos = 0; 4464 SubstTemplateTemplateParmPackStorage *Subst 4465 = SubstTemplateTemplateParmPacks.FindNodeOrInsertPos(ID, InsertPos); 4466 4467 if (!Subst) { 4468 Subst = new (*this) SubstTemplateTemplateParmPackStorage(Self, Param, 4469 ArgPack.pack_size(), 4470 ArgPack.pack_begin()); 4471 SubstTemplateTemplateParmPacks.InsertNode(Subst, InsertPos); 4472 } 4473 4474 return TemplateName(Subst); 4475} 4476 4477/// getFromTargetType - Given one of the integer types provided by 4478/// TargetInfo, produce the corresponding type. The unsigned @p Type 4479/// is actually a value of type @c TargetInfo::IntType. 4480CanQualType ASTContext::getFromTargetType(unsigned Type) const { 4481 switch (Type) { 4482 case TargetInfo::NoInt: return CanQualType(); 4483 case TargetInfo::SignedShort: return ShortTy; 4484 case TargetInfo::UnsignedShort: return UnsignedShortTy; 4485 case TargetInfo::SignedInt: return IntTy; 4486 case TargetInfo::UnsignedInt: return UnsignedIntTy; 4487 case TargetInfo::SignedLong: return LongTy; 4488 case TargetInfo::UnsignedLong: return UnsignedLongTy; 4489 case TargetInfo::SignedLongLong: return LongLongTy; 4490 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 4491 } 4492 4493 assert(false && "Unhandled TargetInfo::IntType value"); 4494 return CanQualType(); 4495} 4496 4497//===----------------------------------------------------------------------===// 4498// Type Predicates. 4499//===----------------------------------------------------------------------===// 4500 4501/// isObjCNSObjectType - Return true if this is an NSObject object using 4502/// NSObject attribute on a c-style pointer type. 4503/// FIXME - Make it work directly on types. 4504/// FIXME: Move to Type. 4505/// 4506bool ASTContext::isObjCNSObjectType(QualType Ty) const { 4507 if (const TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 4508 if (TypedefDecl *TD = TDT->getDecl()) 4509 if (TD->getAttr<ObjCNSObjectAttr>()) 4510 return true; 4511 } 4512 return false; 4513} 4514 4515/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 4516/// garbage collection attribute. 4517/// 4518Qualifiers::GC ASTContext::getObjCGCAttrKind(QualType Ty) const { 4519 if (getLangOptions().getGCMode() == LangOptions::NonGC) 4520 return Qualifiers::GCNone; 4521 4522 assert(getLangOptions().ObjC1); 4523 Qualifiers::GC GCAttrs = Ty.getObjCGCAttr(); 4524 4525 // Default behaviour under objective-C's gc is for ObjC pointers 4526 // (or pointers to them) be treated as though they were declared 4527 // as __strong. 4528 if (GCAttrs == Qualifiers::GCNone) { 4529 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 4530 return Qualifiers::Strong; 4531 else if (Ty->isPointerType()) 4532 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 4533 } else { 4534 // It's not valid to set GC attributes on anything that isn't a 4535 // pointer. 4536#ifndef NDEBUG 4537 QualType CT = Ty->getCanonicalTypeInternal(); 4538 while (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 4539 CT = AT->getElementType(); 4540 assert(CT->isAnyPointerType() || CT->isBlockPointerType()); 4541#endif 4542 } 4543 return GCAttrs; 4544} 4545 4546//===----------------------------------------------------------------------===// 4547// Type Compatibility Testing 4548//===----------------------------------------------------------------------===// 4549 4550/// areCompatVectorTypes - Return true if the two specified vector types are 4551/// compatible. 4552static bool areCompatVectorTypes(const VectorType *LHS, 4553 const VectorType *RHS) { 4554 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 4555 return LHS->getElementType() == RHS->getElementType() && 4556 LHS->getNumElements() == RHS->getNumElements(); 4557} 4558 4559bool ASTContext::areCompatibleVectorTypes(QualType FirstVec, 4560 QualType SecondVec) { 4561 assert(FirstVec->isVectorType() && "FirstVec should be a vector type"); 4562 assert(SecondVec->isVectorType() && "SecondVec should be a vector type"); 4563 4564 if (hasSameUnqualifiedType(FirstVec, SecondVec)) 4565 return true; 4566 4567 // Treat Neon vector types and most AltiVec vector types as if they are the 4568 // equivalent GCC vector types. 4569 const VectorType *First = FirstVec->getAs<VectorType>(); 4570 const VectorType *Second = SecondVec->getAs<VectorType>(); 4571 if (First->getNumElements() == Second->getNumElements() && 4572 hasSameType(First->getElementType(), Second->getElementType()) && 4573 First->getVectorKind() != VectorType::AltiVecPixel && 4574 First->getVectorKind() != VectorType::AltiVecBool && 4575 Second->getVectorKind() != VectorType::AltiVecPixel && 4576 Second->getVectorKind() != VectorType::AltiVecBool) 4577 return true; 4578 4579 return false; 4580} 4581 4582//===----------------------------------------------------------------------===// 4583// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 4584//===----------------------------------------------------------------------===// 4585 4586/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 4587/// inheritance hierarchy of 'rProto'. 4588bool 4589ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 4590 ObjCProtocolDecl *rProto) const { 4591 if (lProto == rProto) 4592 return true; 4593 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 4594 E = rProto->protocol_end(); PI != E; ++PI) 4595 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 4596 return true; 4597 return false; 4598} 4599 4600/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 4601/// return true if lhs's protocols conform to rhs's protocol; false 4602/// otherwise. 4603bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 4604 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 4605 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 4606 return false; 4607} 4608 4609/// ObjCQualifiedClassTypesAreCompatible - compare Class<p,...> and 4610/// Class<p1, ...>. 4611bool ASTContext::ObjCQualifiedClassTypesAreCompatible(QualType lhs, 4612 QualType rhs) { 4613 const ObjCObjectPointerType *lhsQID = lhs->getAs<ObjCObjectPointerType>(); 4614 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4615 assert ((lhsQID && rhsOPT) && "ObjCQualifiedClassTypesAreCompatible"); 4616 4617 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4618 E = lhsQID->qual_end(); I != E; ++I) { 4619 bool match = false; 4620 ObjCProtocolDecl *lhsProto = *I; 4621 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4622 E = rhsOPT->qual_end(); J != E; ++J) { 4623 ObjCProtocolDecl *rhsProto = *J; 4624 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto)) { 4625 match = true; 4626 break; 4627 } 4628 } 4629 if (!match) 4630 return false; 4631 } 4632 return true; 4633} 4634 4635/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 4636/// ObjCQualifiedIDType. 4637bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 4638 bool compare) { 4639 // Allow id<P..> and an 'id' or void* type in all cases. 4640 if (lhs->isVoidPointerType() || 4641 lhs->isObjCIdType() || lhs->isObjCClassType()) 4642 return true; 4643 else if (rhs->isVoidPointerType() || 4644 rhs->isObjCIdType() || rhs->isObjCClassType()) 4645 return true; 4646 4647 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 4648 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 4649 4650 if (!rhsOPT) return false; 4651 4652 if (rhsOPT->qual_empty()) { 4653 // If the RHS is a unqualified interface pointer "NSString*", 4654 // make sure we check the class hierarchy. 4655 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4656 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4657 E = lhsQID->qual_end(); I != E; ++I) { 4658 // when comparing an id<P> on lhs with a static type on rhs, 4659 // see if static class implements all of id's protocols, directly or 4660 // through its super class and categories. 4661 if (!rhsID->ClassImplementsProtocol(*I, true)) 4662 return false; 4663 } 4664 } 4665 // If there are no qualifiers and no interface, we have an 'id'. 4666 return true; 4667 } 4668 // Both the right and left sides have qualifiers. 4669 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4670 E = lhsQID->qual_end(); I != E; ++I) { 4671 ObjCProtocolDecl *lhsProto = *I; 4672 bool match = false; 4673 4674 // when comparing an id<P> on lhs with a static type on rhs, 4675 // see if static class implements all of id's protocols, directly or 4676 // through its super class and categories. 4677 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 4678 E = rhsOPT->qual_end(); J != E; ++J) { 4679 ObjCProtocolDecl *rhsProto = *J; 4680 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4681 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4682 match = true; 4683 break; 4684 } 4685 } 4686 // If the RHS is a qualified interface pointer "NSString<P>*", 4687 // make sure we check the class hierarchy. 4688 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 4689 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 4690 E = lhsQID->qual_end(); I != E; ++I) { 4691 // when comparing an id<P> on lhs with a static type on rhs, 4692 // see if static class implements all of id's protocols, directly or 4693 // through its super class and categories. 4694 if (rhsID->ClassImplementsProtocol(*I, true)) { 4695 match = true; 4696 break; 4697 } 4698 } 4699 } 4700 if (!match) 4701 return false; 4702 } 4703 4704 return true; 4705 } 4706 4707 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 4708 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 4709 4710 if (const ObjCObjectPointerType *lhsOPT = 4711 lhs->getAsObjCInterfacePointerType()) { 4712 // If both the right and left sides have qualifiers. 4713 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 4714 E = lhsOPT->qual_end(); I != E; ++I) { 4715 ObjCProtocolDecl *lhsProto = *I; 4716 bool match = false; 4717 4718 // when comparing an id<P> on rhs with a static type on lhs, 4719 // see if static class implements all of id's protocols, directly or 4720 // through its super class and categories. 4721 // First, lhs protocols in the qualifier list must be found, direct 4722 // or indirect in rhs's qualifier list or it is a mismatch. 4723 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4724 E = rhsQID->qual_end(); J != E; ++J) { 4725 ObjCProtocolDecl *rhsProto = *J; 4726 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4727 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4728 match = true; 4729 break; 4730 } 4731 } 4732 if (!match) 4733 return false; 4734 } 4735 4736 // Static class's protocols, or its super class or category protocols 4737 // must be found, direct or indirect in rhs's qualifier list or it is a mismatch. 4738 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 4739 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4740 CollectInheritedProtocols(lhsID, LHSInheritedProtocols); 4741 // This is rather dubious but matches gcc's behavior. If lhs has 4742 // no type qualifier and its class has no static protocol(s) 4743 // assume that it is mismatch. 4744 if (LHSInheritedProtocols.empty() && lhsOPT->qual_empty()) 4745 return false; 4746 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4747 LHSInheritedProtocols.begin(), 4748 E = LHSInheritedProtocols.end(); I != E; ++I) { 4749 bool match = false; 4750 ObjCProtocolDecl *lhsProto = (*I); 4751 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 4752 E = rhsQID->qual_end(); J != E; ++J) { 4753 ObjCProtocolDecl *rhsProto = *J; 4754 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 4755 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 4756 match = true; 4757 break; 4758 } 4759 } 4760 if (!match) 4761 return false; 4762 } 4763 } 4764 return true; 4765 } 4766 return false; 4767} 4768 4769/// canAssignObjCInterfaces - Return true if the two interface types are 4770/// compatible for assignment from RHS to LHS. This handles validation of any 4771/// protocol qualifiers on the LHS or RHS. 4772/// 4773bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 4774 const ObjCObjectPointerType *RHSOPT) { 4775 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4776 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4777 4778 // If either type represents the built-in 'id' or 'Class' types, return true. 4779 if (LHS->isObjCUnqualifiedIdOrClass() || 4780 RHS->isObjCUnqualifiedIdOrClass()) 4781 return true; 4782 4783 if (LHS->isObjCQualifiedId() || RHS->isObjCQualifiedId()) 4784 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4785 QualType(RHSOPT,0), 4786 false); 4787 4788 if (LHS->isObjCQualifiedClass() && RHS->isObjCQualifiedClass()) 4789 return ObjCQualifiedClassTypesAreCompatible(QualType(LHSOPT,0), 4790 QualType(RHSOPT,0)); 4791 4792 // If we have 2 user-defined types, fall into that path. 4793 if (LHS->getInterface() && RHS->getInterface()) 4794 return canAssignObjCInterfaces(LHS, RHS); 4795 4796 return false; 4797} 4798 4799/// canAssignObjCInterfacesInBlockPointer - This routine is specifically written 4800/// for providing type-safty for objective-c pointers used to pass/return 4801/// arguments in block literals. When passed as arguments, passing 'A*' where 4802/// 'id' is expected is not OK. Passing 'Sub *" where 'Super *" is expected is 4803/// not OK. For the return type, the opposite is not OK. 4804bool ASTContext::canAssignObjCInterfacesInBlockPointer( 4805 const ObjCObjectPointerType *LHSOPT, 4806 const ObjCObjectPointerType *RHSOPT) { 4807 if (RHSOPT->isObjCBuiltinType() || LHSOPT->isObjCIdType()) 4808 return true; 4809 4810 if (LHSOPT->isObjCBuiltinType()) { 4811 return RHSOPT->isObjCBuiltinType() || RHSOPT->isObjCQualifiedIdType(); 4812 } 4813 4814 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 4815 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 4816 QualType(RHSOPT,0), 4817 false); 4818 4819 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 4820 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 4821 if (LHS && RHS) { // We have 2 user-defined types. 4822 if (LHS != RHS) { 4823 if (LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 4824 return false; 4825 if (RHS->getDecl()->isSuperClassOf(LHS->getDecl())) 4826 return true; 4827 } 4828 else 4829 return true; 4830 } 4831 return false; 4832} 4833 4834/// getIntersectionOfProtocols - This routine finds the intersection of set 4835/// of protocols inherited from two distinct objective-c pointer objects. 4836/// It is used to build composite qualifier list of the composite type of 4837/// the conditional expression involving two objective-c pointer objects. 4838static 4839void getIntersectionOfProtocols(ASTContext &Context, 4840 const ObjCObjectPointerType *LHSOPT, 4841 const ObjCObjectPointerType *RHSOPT, 4842 llvm::SmallVectorImpl<ObjCProtocolDecl *> &IntersectionOfProtocols) { 4843 4844 const ObjCObjectType* LHS = LHSOPT->getObjectType(); 4845 const ObjCObjectType* RHS = RHSOPT->getObjectType(); 4846 assert(LHS->getInterface() && "LHS must have an interface base"); 4847 assert(RHS->getInterface() && "RHS must have an interface base"); 4848 4849 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> InheritedProtocolSet; 4850 unsigned LHSNumProtocols = LHS->getNumProtocols(); 4851 if (LHSNumProtocols > 0) 4852 InheritedProtocolSet.insert(LHS->qual_begin(), LHS->qual_end()); 4853 else { 4854 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> LHSInheritedProtocols; 4855 Context.CollectInheritedProtocols(LHS->getInterface(), 4856 LHSInheritedProtocols); 4857 InheritedProtocolSet.insert(LHSInheritedProtocols.begin(), 4858 LHSInheritedProtocols.end()); 4859 } 4860 4861 unsigned RHSNumProtocols = RHS->getNumProtocols(); 4862 if (RHSNumProtocols > 0) { 4863 ObjCProtocolDecl **RHSProtocols = 4864 const_cast<ObjCProtocolDecl **>(RHS->qual_begin()); 4865 for (unsigned i = 0; i < RHSNumProtocols; ++i) 4866 if (InheritedProtocolSet.count(RHSProtocols[i])) 4867 IntersectionOfProtocols.push_back(RHSProtocols[i]); 4868 } 4869 else { 4870 llvm::SmallPtrSet<ObjCProtocolDecl *, 8> RHSInheritedProtocols; 4871 Context.CollectInheritedProtocols(RHS->getInterface(), 4872 RHSInheritedProtocols); 4873 for (llvm::SmallPtrSet<ObjCProtocolDecl*,8>::iterator I = 4874 RHSInheritedProtocols.begin(), 4875 E = RHSInheritedProtocols.end(); I != E; ++I) 4876 if (InheritedProtocolSet.count((*I))) 4877 IntersectionOfProtocols.push_back((*I)); 4878 } 4879} 4880 4881/// areCommonBaseCompatible - Returns common base class of the two classes if 4882/// one found. Note that this is O'2 algorithm. But it will be called as the 4883/// last type comparison in a ?-exp of ObjC pointer types before a 4884/// warning is issued. So, its invokation is extremely rare. 4885QualType ASTContext::areCommonBaseCompatible( 4886 const ObjCObjectPointerType *Lptr, 4887 const ObjCObjectPointerType *Rptr) { 4888 const ObjCObjectType *LHS = Lptr->getObjectType(); 4889 const ObjCObjectType *RHS = Rptr->getObjectType(); 4890 const ObjCInterfaceDecl* LDecl = LHS->getInterface(); 4891 const ObjCInterfaceDecl* RDecl = RHS->getInterface(); 4892 if (!LDecl || !RDecl) 4893 return QualType(); 4894 4895 while ((LDecl = LDecl->getSuperClass())) { 4896 LHS = cast<ObjCInterfaceType>(getObjCInterfaceType(LDecl)); 4897 if (canAssignObjCInterfaces(LHS, RHS)) { 4898 llvm::SmallVector<ObjCProtocolDecl *, 8> Protocols; 4899 getIntersectionOfProtocols(*this, Lptr, Rptr, Protocols); 4900 4901 QualType Result = QualType(LHS, 0); 4902 if (!Protocols.empty()) 4903 Result = getObjCObjectType(Result, Protocols.data(), Protocols.size()); 4904 Result = getObjCObjectPointerType(Result); 4905 return Result; 4906 } 4907 } 4908 4909 return QualType(); 4910} 4911 4912bool ASTContext::canAssignObjCInterfaces(const ObjCObjectType *LHS, 4913 const ObjCObjectType *RHS) { 4914 assert(LHS->getInterface() && "LHS is not an interface type"); 4915 assert(RHS->getInterface() && "RHS is not an interface type"); 4916 4917 // Verify that the base decls are compatible: the RHS must be a subclass of 4918 // the LHS. 4919 if (!LHS->getInterface()->isSuperClassOf(RHS->getInterface())) 4920 return false; 4921 4922 // RHS must have a superset of the protocols in the LHS. If the LHS is not 4923 // protocol qualified at all, then we are good. 4924 if (LHS->getNumProtocols() == 0) 4925 return true; 4926 4927 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 4928 // isn't a superset. 4929 if (RHS->getNumProtocols() == 0) 4930 return true; // FIXME: should return false! 4931 4932 for (ObjCObjectType::qual_iterator LHSPI = LHS->qual_begin(), 4933 LHSPE = LHS->qual_end(); 4934 LHSPI != LHSPE; LHSPI++) { 4935 bool RHSImplementsProtocol = false; 4936 4937 // If the RHS doesn't implement the protocol on the left, the types 4938 // are incompatible. 4939 for (ObjCObjectType::qual_iterator RHSPI = RHS->qual_begin(), 4940 RHSPE = RHS->qual_end(); 4941 RHSPI != RHSPE; RHSPI++) { 4942 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 4943 RHSImplementsProtocol = true; 4944 break; 4945 } 4946 } 4947 // FIXME: For better diagnostics, consider passing back the protocol name. 4948 if (!RHSImplementsProtocol) 4949 return false; 4950 } 4951 // The RHS implements all protocols listed on the LHS. 4952 return true; 4953} 4954 4955bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 4956 // get the "pointed to" types 4957 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 4958 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 4959 4960 if (!LHSOPT || !RHSOPT) 4961 return false; 4962 4963 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 4964 canAssignObjCInterfaces(RHSOPT, LHSOPT); 4965} 4966 4967bool ASTContext::canBindObjCObjectType(QualType To, QualType From) { 4968 return canAssignObjCInterfaces( 4969 getObjCObjectPointerType(To)->getAs<ObjCObjectPointerType>(), 4970 getObjCObjectPointerType(From)->getAs<ObjCObjectPointerType>()); 4971} 4972 4973/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 4974/// both shall have the identically qualified version of a compatible type. 4975/// C99 6.2.7p1: Two types have compatible types if their types are the 4976/// same. See 6.7.[2,3,5] for additional rules. 4977bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS, 4978 bool CompareUnqualified) { 4979 if (getLangOptions().CPlusPlus) 4980 return hasSameType(LHS, RHS); 4981 4982 return !mergeTypes(LHS, RHS, false, CompareUnqualified).isNull(); 4983} 4984 4985bool ASTContext::typesAreBlockPointerCompatible(QualType LHS, QualType RHS) { 4986 return !mergeTypes(LHS, RHS, true).isNull(); 4987} 4988 4989/// mergeTransparentUnionType - if T is a transparent union type and a member 4990/// of T is compatible with SubType, return the merged type, else return 4991/// QualType() 4992QualType ASTContext::mergeTransparentUnionType(QualType T, QualType SubType, 4993 bool OfBlockPointer, 4994 bool Unqualified) { 4995 if (const RecordType *UT = T->getAsUnionType()) { 4996 RecordDecl *UD = UT->getDecl(); 4997 if (UD->hasAttr<TransparentUnionAttr>()) { 4998 for (RecordDecl::field_iterator it = UD->field_begin(), 4999 itend = UD->field_end(); it != itend; ++it) { 5000 QualType ET = it->getType().getUnqualifiedType(); 5001 QualType MT = mergeTypes(ET, SubType, OfBlockPointer, Unqualified); 5002 if (!MT.isNull()) 5003 return MT; 5004 } 5005 } 5006 } 5007 5008 return QualType(); 5009} 5010 5011/// mergeFunctionArgumentTypes - merge two types which appear as function 5012/// argument types 5013QualType ASTContext::mergeFunctionArgumentTypes(QualType lhs, QualType rhs, 5014 bool OfBlockPointer, 5015 bool Unqualified) { 5016 // GNU extension: two types are compatible if they appear as a function 5017 // argument, one of the types is a transparent union type and the other 5018 // type is compatible with a union member 5019 QualType lmerge = mergeTransparentUnionType(lhs, rhs, OfBlockPointer, 5020 Unqualified); 5021 if (!lmerge.isNull()) 5022 return lmerge; 5023 5024 QualType rmerge = mergeTransparentUnionType(rhs, lhs, OfBlockPointer, 5025 Unqualified); 5026 if (!rmerge.isNull()) 5027 return rmerge; 5028 5029 return mergeTypes(lhs, rhs, OfBlockPointer, Unqualified); 5030} 5031 5032QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs, 5033 bool OfBlockPointer, 5034 bool Unqualified) { 5035 const FunctionType *lbase = lhs->getAs<FunctionType>(); 5036 const FunctionType *rbase = rhs->getAs<FunctionType>(); 5037 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 5038 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 5039 bool allLTypes = true; 5040 bool allRTypes = true; 5041 5042 // Check return type 5043 QualType retType; 5044 if (OfBlockPointer) { 5045 QualType RHS = rbase->getResultType(); 5046 QualType LHS = lbase->getResultType(); 5047 bool UnqualifiedResult = Unqualified; 5048 if (!UnqualifiedResult) 5049 UnqualifiedResult = (!RHS.hasQualifiers() && LHS.hasQualifiers()); 5050 retType = mergeTypes(RHS, LHS, true, UnqualifiedResult); 5051 } 5052 else 5053 retType = mergeTypes(lbase->getResultType(), rbase->getResultType(), false, 5054 Unqualified); 5055 if (retType.isNull()) return QualType(); 5056 5057 if (Unqualified) 5058 retType = retType.getUnqualifiedType(); 5059 5060 CanQualType LRetType = getCanonicalType(lbase->getResultType()); 5061 CanQualType RRetType = getCanonicalType(rbase->getResultType()); 5062 if (Unqualified) { 5063 LRetType = LRetType.getUnqualifiedType(); 5064 RRetType = RRetType.getUnqualifiedType(); 5065 } 5066 5067 if (getCanonicalType(retType) != LRetType) 5068 allLTypes = false; 5069 if (getCanonicalType(retType) != RRetType) 5070 allRTypes = false; 5071 5072 // FIXME: double check this 5073 // FIXME: should we error if lbase->getRegParmAttr() != 0 && 5074 // rbase->getRegParmAttr() != 0 && 5075 // lbase->getRegParmAttr() != rbase->getRegParmAttr()? 5076 FunctionType::ExtInfo lbaseInfo = lbase->getExtInfo(); 5077 FunctionType::ExtInfo rbaseInfo = rbase->getExtInfo(); 5078 5079 // Compatible functions must have compatible calling conventions 5080 if (!isSameCallConv(lbaseInfo.getCC(), rbaseInfo.getCC())) 5081 return QualType(); 5082 5083 // Regparm is part of the calling convention. 5084 if (lbaseInfo.getRegParm() != rbaseInfo.getRegParm()) 5085 return QualType(); 5086 5087 // It's noreturn if either type is. 5088 // FIXME: some uses, e.g. conditional exprs, really want this to be 'both'. 5089 bool NoReturn = lbaseInfo.getNoReturn() || rbaseInfo.getNoReturn(); 5090 if (NoReturn != lbaseInfo.getNoReturn()) 5091 allLTypes = false; 5092 if (NoReturn != rbaseInfo.getNoReturn()) 5093 allRTypes = false; 5094 5095 FunctionType::ExtInfo einfo(NoReturn, 5096 lbaseInfo.getRegParm(), 5097 lbaseInfo.getCC()); 5098 5099 if (lproto && rproto) { // two C99 style function prototypes 5100 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 5101 "C++ shouldn't be here"); 5102 unsigned lproto_nargs = lproto->getNumArgs(); 5103 unsigned rproto_nargs = rproto->getNumArgs(); 5104 5105 // Compatible functions must have the same number of arguments 5106 if (lproto_nargs != rproto_nargs) 5107 return QualType(); 5108 5109 // Variadic and non-variadic functions aren't compatible 5110 if (lproto->isVariadic() != rproto->isVariadic()) 5111 return QualType(); 5112 5113 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 5114 return QualType(); 5115 5116 // Check argument compatibility 5117 llvm::SmallVector<QualType, 10> types; 5118 for (unsigned i = 0; i < lproto_nargs; i++) { 5119 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 5120 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 5121 QualType argtype = mergeFunctionArgumentTypes(largtype, rargtype, 5122 OfBlockPointer, 5123 Unqualified); 5124 if (argtype.isNull()) return QualType(); 5125 5126 if (Unqualified) 5127 argtype = argtype.getUnqualifiedType(); 5128 5129 types.push_back(argtype); 5130 if (Unqualified) { 5131 largtype = largtype.getUnqualifiedType(); 5132 rargtype = rargtype.getUnqualifiedType(); 5133 } 5134 5135 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 5136 allLTypes = false; 5137 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 5138 allRTypes = false; 5139 } 5140 if (allLTypes) return lhs; 5141 if (allRTypes) return rhs; 5142 5143 FunctionProtoType::ExtProtoInfo EPI = lproto->getExtProtoInfo(); 5144 EPI.ExtInfo = einfo; 5145 return getFunctionType(retType, types.begin(), types.size(), EPI); 5146 } 5147 5148 if (lproto) allRTypes = false; 5149 if (rproto) allLTypes = false; 5150 5151 const FunctionProtoType *proto = lproto ? lproto : rproto; 5152 if (proto) { 5153 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 5154 if (proto->isVariadic()) return QualType(); 5155 // Check that the types are compatible with the types that 5156 // would result from default argument promotions (C99 6.7.5.3p15). 5157 // The only types actually affected are promotable integer 5158 // types and floats, which would be passed as a different 5159 // type depending on whether the prototype is visible. 5160 unsigned proto_nargs = proto->getNumArgs(); 5161 for (unsigned i = 0; i < proto_nargs; ++i) { 5162 QualType argTy = proto->getArgType(i); 5163 5164 // Look at the promotion type of enum types, since that is the type used 5165 // to pass enum values. 5166 if (const EnumType *Enum = argTy->getAs<EnumType>()) 5167 argTy = Enum->getDecl()->getPromotionType(); 5168 5169 if (argTy->isPromotableIntegerType() || 5170 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 5171 return QualType(); 5172 } 5173 5174 if (allLTypes) return lhs; 5175 if (allRTypes) return rhs; 5176 5177 FunctionProtoType::ExtProtoInfo EPI = proto->getExtProtoInfo(); 5178 EPI.ExtInfo = einfo; 5179 return getFunctionType(retType, proto->arg_type_begin(), 5180 proto->getNumArgs(), EPI); 5181 } 5182 5183 if (allLTypes) return lhs; 5184 if (allRTypes) return rhs; 5185 return getFunctionNoProtoType(retType, einfo); 5186} 5187 5188QualType ASTContext::mergeTypes(QualType LHS, QualType RHS, 5189 bool OfBlockPointer, 5190 bool Unqualified) { 5191 // C++ [expr]: If an expression initially has the type "reference to T", the 5192 // type is adjusted to "T" prior to any further analysis, the expression 5193 // designates the object or function denoted by the reference, and the 5194 // expression is an lvalue unless the reference is an rvalue reference and 5195 // the expression is a function call (possibly inside parentheses). 5196 assert(!LHS->getAs<ReferenceType>() && "LHS is a reference type?"); 5197 assert(!RHS->getAs<ReferenceType>() && "RHS is a reference type?"); 5198 5199 if (Unqualified) { 5200 LHS = LHS.getUnqualifiedType(); 5201 RHS = RHS.getUnqualifiedType(); 5202 } 5203 5204 QualType LHSCan = getCanonicalType(LHS), 5205 RHSCan = getCanonicalType(RHS); 5206 5207 // If two types are identical, they are compatible. 5208 if (LHSCan == RHSCan) 5209 return LHS; 5210 5211 // If the qualifiers are different, the types aren't compatible... mostly. 5212 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5213 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5214 if (LQuals != RQuals) { 5215 // If any of these qualifiers are different, we have a type 5216 // mismatch. 5217 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5218 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5219 return QualType(); 5220 5221 // Exactly one GC qualifier difference is allowed: __strong is 5222 // okay if the other type has no GC qualifier but is an Objective 5223 // C object pointer (i.e. implicitly strong by default). We fix 5224 // this by pretending that the unqualified type was actually 5225 // qualified __strong. 5226 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5227 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5228 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5229 5230 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5231 return QualType(); 5232 5233 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 5234 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 5235 } 5236 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 5237 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 5238 } 5239 return QualType(); 5240 } 5241 5242 // Okay, qualifiers are equal. 5243 5244 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 5245 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 5246 5247 // We want to consider the two function types to be the same for these 5248 // comparisons, just force one to the other. 5249 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 5250 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 5251 5252 // Same as above for arrays 5253 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 5254 LHSClass = Type::ConstantArray; 5255 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 5256 RHSClass = Type::ConstantArray; 5257 5258 // ObjCInterfaces are just specialized ObjCObjects. 5259 if (LHSClass == Type::ObjCInterface) LHSClass = Type::ObjCObject; 5260 if (RHSClass == Type::ObjCInterface) RHSClass = Type::ObjCObject; 5261 5262 // Canonicalize ExtVector -> Vector. 5263 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 5264 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 5265 5266 // If the canonical type classes don't match. 5267 if (LHSClass != RHSClass) { 5268 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 5269 // a signed integer type, or an unsigned integer type. 5270 // Compatibility is based on the underlying type, not the promotion 5271 // type. 5272 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 5273 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 5274 return RHS; 5275 } 5276 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 5277 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 5278 return LHS; 5279 } 5280 5281 return QualType(); 5282 } 5283 5284 // The canonical type classes match. 5285 switch (LHSClass) { 5286#define TYPE(Class, Base) 5287#define ABSTRACT_TYPE(Class, Base) 5288#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: 5289#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 5290#define DEPENDENT_TYPE(Class, Base) case Type::Class: 5291#include "clang/AST/TypeNodes.def" 5292 assert(false && "Non-canonical and dependent types shouldn't get here"); 5293 return QualType(); 5294 5295 case Type::LValueReference: 5296 case Type::RValueReference: 5297 case Type::MemberPointer: 5298 assert(false && "C++ should never be in mergeTypes"); 5299 return QualType(); 5300 5301 case Type::ObjCInterface: 5302 case Type::IncompleteArray: 5303 case Type::VariableArray: 5304 case Type::FunctionProto: 5305 case Type::ExtVector: 5306 assert(false && "Types are eliminated above"); 5307 return QualType(); 5308 5309 case Type::Pointer: 5310 { 5311 // Merge two pointer types, while trying to preserve typedef info 5312 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 5313 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 5314 if (Unqualified) { 5315 LHSPointee = LHSPointee.getUnqualifiedType(); 5316 RHSPointee = RHSPointee.getUnqualifiedType(); 5317 } 5318 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, false, 5319 Unqualified); 5320 if (ResultType.isNull()) return QualType(); 5321 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5322 return LHS; 5323 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5324 return RHS; 5325 return getPointerType(ResultType); 5326 } 5327 case Type::BlockPointer: 5328 { 5329 // Merge two block pointer types, while trying to preserve typedef info 5330 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 5331 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 5332 if (Unqualified) { 5333 LHSPointee = LHSPointee.getUnqualifiedType(); 5334 RHSPointee = RHSPointee.getUnqualifiedType(); 5335 } 5336 QualType ResultType = mergeTypes(LHSPointee, RHSPointee, OfBlockPointer, 5337 Unqualified); 5338 if (ResultType.isNull()) return QualType(); 5339 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 5340 return LHS; 5341 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 5342 return RHS; 5343 return getBlockPointerType(ResultType); 5344 } 5345 case Type::ConstantArray: 5346 { 5347 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 5348 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 5349 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 5350 return QualType(); 5351 5352 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 5353 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 5354 if (Unqualified) { 5355 LHSElem = LHSElem.getUnqualifiedType(); 5356 RHSElem = RHSElem.getUnqualifiedType(); 5357 } 5358 5359 QualType ResultType = mergeTypes(LHSElem, RHSElem, false, Unqualified); 5360 if (ResultType.isNull()) return QualType(); 5361 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5362 return LHS; 5363 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5364 return RHS; 5365 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 5366 ArrayType::ArraySizeModifier(), 0); 5367 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 5368 ArrayType::ArraySizeModifier(), 0); 5369 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 5370 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 5371 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 5372 return LHS; 5373 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 5374 return RHS; 5375 if (LVAT) { 5376 // FIXME: This isn't correct! But tricky to implement because 5377 // the array's size has to be the size of LHS, but the type 5378 // has to be different. 5379 return LHS; 5380 } 5381 if (RVAT) { 5382 // FIXME: This isn't correct! But tricky to implement because 5383 // the array's size has to be the size of RHS, but the type 5384 // has to be different. 5385 return RHS; 5386 } 5387 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 5388 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 5389 return getIncompleteArrayType(ResultType, 5390 ArrayType::ArraySizeModifier(), 0); 5391 } 5392 case Type::FunctionNoProto: 5393 return mergeFunctionTypes(LHS, RHS, OfBlockPointer, Unqualified); 5394 case Type::Record: 5395 case Type::Enum: 5396 return QualType(); 5397 case Type::Builtin: 5398 // Only exactly equal builtin types are compatible, which is tested above. 5399 return QualType(); 5400 case Type::Complex: 5401 // Distinct complex types are incompatible. 5402 return QualType(); 5403 case Type::Vector: 5404 // FIXME: The merged type should be an ExtVector! 5405 if (areCompatVectorTypes(LHSCan->getAs<VectorType>(), 5406 RHSCan->getAs<VectorType>())) 5407 return LHS; 5408 return QualType(); 5409 case Type::ObjCObject: { 5410 // Check if the types are assignment compatible. 5411 // FIXME: This should be type compatibility, e.g. whether 5412 // "LHS x; RHS x;" at global scope is legal. 5413 const ObjCObjectType* LHSIface = LHS->getAs<ObjCObjectType>(); 5414 const ObjCObjectType* RHSIface = RHS->getAs<ObjCObjectType>(); 5415 if (canAssignObjCInterfaces(LHSIface, RHSIface)) 5416 return LHS; 5417 5418 return QualType(); 5419 } 5420 case Type::ObjCObjectPointer: { 5421 if (OfBlockPointer) { 5422 if (canAssignObjCInterfacesInBlockPointer( 5423 LHS->getAs<ObjCObjectPointerType>(), 5424 RHS->getAs<ObjCObjectPointerType>())) 5425 return LHS; 5426 return QualType(); 5427 } 5428 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 5429 RHS->getAs<ObjCObjectPointerType>())) 5430 return LHS; 5431 5432 return QualType(); 5433 } 5434 } 5435 5436 return QualType(); 5437} 5438 5439/// mergeObjCGCQualifiers - This routine merges ObjC's GC attribute of 'LHS' and 5440/// 'RHS' attributes and returns the merged version; including for function 5441/// return types. 5442QualType ASTContext::mergeObjCGCQualifiers(QualType LHS, QualType RHS) { 5443 QualType LHSCan = getCanonicalType(LHS), 5444 RHSCan = getCanonicalType(RHS); 5445 // If two types are identical, they are compatible. 5446 if (LHSCan == RHSCan) 5447 return LHS; 5448 if (RHSCan->isFunctionType()) { 5449 if (!LHSCan->isFunctionType()) 5450 return QualType(); 5451 QualType OldReturnType = 5452 cast<FunctionType>(RHSCan.getTypePtr())->getResultType(); 5453 QualType NewReturnType = 5454 cast<FunctionType>(LHSCan.getTypePtr())->getResultType(); 5455 QualType ResReturnType = 5456 mergeObjCGCQualifiers(NewReturnType, OldReturnType); 5457 if (ResReturnType.isNull()) 5458 return QualType(); 5459 if (ResReturnType == NewReturnType || ResReturnType == OldReturnType) { 5460 // id foo(); ... __strong id foo(); or: __strong id foo(); ... id foo(); 5461 // In either case, use OldReturnType to build the new function type. 5462 const FunctionType *F = LHS->getAs<FunctionType>(); 5463 if (const FunctionProtoType *FPT = cast<FunctionProtoType>(F)) { 5464 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 5465 EPI.ExtInfo = getFunctionExtInfo(LHS); 5466 QualType ResultType 5467 = getFunctionType(OldReturnType, FPT->arg_type_begin(), 5468 FPT->getNumArgs(), EPI); 5469 return ResultType; 5470 } 5471 } 5472 return QualType(); 5473 } 5474 5475 // If the qualifiers are different, the types can still be merged. 5476 Qualifiers LQuals = LHSCan.getLocalQualifiers(); 5477 Qualifiers RQuals = RHSCan.getLocalQualifiers(); 5478 if (LQuals != RQuals) { 5479 // If any of these qualifiers are different, we have a type mismatch. 5480 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 5481 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 5482 return QualType(); 5483 5484 // Exactly one GC qualifier difference is allowed: __strong is 5485 // okay if the other type has no GC qualifier but is an Objective 5486 // C object pointer (i.e. implicitly strong by default). We fix 5487 // this by pretending that the unqualified type was actually 5488 // qualified __strong. 5489 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 5490 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 5491 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 5492 5493 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 5494 return QualType(); 5495 5496 if (GC_L == Qualifiers::Strong) 5497 return LHS; 5498 if (GC_R == Qualifiers::Strong) 5499 return RHS; 5500 return QualType(); 5501 } 5502 5503 if (LHSCan->isObjCObjectPointerType() && RHSCan->isObjCObjectPointerType()) { 5504 QualType LHSBaseQT = LHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5505 QualType RHSBaseQT = RHS->getAs<ObjCObjectPointerType>()->getPointeeType(); 5506 QualType ResQT = mergeObjCGCQualifiers(LHSBaseQT, RHSBaseQT); 5507 if (ResQT == LHSBaseQT) 5508 return LHS; 5509 if (ResQT == RHSBaseQT) 5510 return RHS; 5511 } 5512 return QualType(); 5513} 5514 5515//===----------------------------------------------------------------------===// 5516// Integer Predicates 5517//===----------------------------------------------------------------------===// 5518 5519unsigned ASTContext::getIntWidth(QualType T) const { 5520 if (const EnumType *ET = dyn_cast<EnumType>(T)) 5521 T = ET->getDecl()->getIntegerType(); 5522 if (T->isBooleanType()) 5523 return 1; 5524 // For builtin types, just use the standard type sizing method 5525 return (unsigned)getTypeSize(T); 5526} 5527 5528QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 5529 assert(T->hasSignedIntegerRepresentation() && "Unexpected type"); 5530 5531 // Turn <4 x signed int> -> <4 x unsigned int> 5532 if (const VectorType *VTy = T->getAs<VectorType>()) 5533 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 5534 VTy->getNumElements(), VTy->getVectorKind()); 5535 5536 // For enums, we return the unsigned version of the base type. 5537 if (const EnumType *ETy = T->getAs<EnumType>()) 5538 T = ETy->getDecl()->getIntegerType(); 5539 5540 const BuiltinType *BTy = T->getAs<BuiltinType>(); 5541 assert(BTy && "Unexpected signed integer type"); 5542 switch (BTy->getKind()) { 5543 case BuiltinType::Char_S: 5544 case BuiltinType::SChar: 5545 return UnsignedCharTy; 5546 case BuiltinType::Short: 5547 return UnsignedShortTy; 5548 case BuiltinType::Int: 5549 return UnsignedIntTy; 5550 case BuiltinType::Long: 5551 return UnsignedLongTy; 5552 case BuiltinType::LongLong: 5553 return UnsignedLongLongTy; 5554 case BuiltinType::Int128: 5555 return UnsignedInt128Ty; 5556 default: 5557 assert(0 && "Unexpected signed integer type"); 5558 return QualType(); 5559 } 5560} 5561 5562ExternalASTSource::~ExternalASTSource() { } 5563 5564void ExternalASTSource::PrintStats() { } 5565 5566ASTMutationListener::~ASTMutationListener() { } 5567 5568 5569//===----------------------------------------------------------------------===// 5570// Builtin Type Computation 5571//===----------------------------------------------------------------------===// 5572 5573/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 5574/// pointer over the consumed characters. This returns the resultant type. If 5575/// AllowTypeModifiers is false then modifier like * are not parsed, just basic 5576/// types. This allows "v2i*" to be parsed as a pointer to a v2i instead of 5577/// a vector of "i*". 5578/// 5579/// RequiresICE is filled in on return to indicate whether the value is required 5580/// to be an Integer Constant Expression. 5581static QualType DecodeTypeFromStr(const char *&Str, const ASTContext &Context, 5582 ASTContext::GetBuiltinTypeError &Error, 5583 bool &RequiresICE, 5584 bool AllowTypeModifiers) { 5585 // Modifiers. 5586 int HowLong = 0; 5587 bool Signed = false, Unsigned = false; 5588 RequiresICE = false; 5589 5590 // Read the prefixed modifiers first. 5591 bool Done = false; 5592 while (!Done) { 5593 switch (*Str++) { 5594 default: Done = true; --Str; break; 5595 case 'I': 5596 RequiresICE = true; 5597 break; 5598 case 'S': 5599 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 5600 assert(!Signed && "Can't use 'S' modifier multiple times!"); 5601 Signed = true; 5602 break; 5603 case 'U': 5604 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 5605 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 5606 Unsigned = true; 5607 break; 5608 case 'L': 5609 assert(HowLong <= 2 && "Can't have LLLL modifier"); 5610 ++HowLong; 5611 break; 5612 } 5613 } 5614 5615 QualType Type; 5616 5617 // Read the base type. 5618 switch (*Str++) { 5619 default: assert(0 && "Unknown builtin type letter!"); 5620 case 'v': 5621 assert(HowLong == 0 && !Signed && !Unsigned && 5622 "Bad modifiers used with 'v'!"); 5623 Type = Context.VoidTy; 5624 break; 5625 case 'f': 5626 assert(HowLong == 0 && !Signed && !Unsigned && 5627 "Bad modifiers used with 'f'!"); 5628 Type = Context.FloatTy; 5629 break; 5630 case 'd': 5631 assert(HowLong < 2 && !Signed && !Unsigned && 5632 "Bad modifiers used with 'd'!"); 5633 if (HowLong) 5634 Type = Context.LongDoubleTy; 5635 else 5636 Type = Context.DoubleTy; 5637 break; 5638 case 's': 5639 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 5640 if (Unsigned) 5641 Type = Context.UnsignedShortTy; 5642 else 5643 Type = Context.ShortTy; 5644 break; 5645 case 'i': 5646 if (HowLong == 3) 5647 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 5648 else if (HowLong == 2) 5649 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 5650 else if (HowLong == 1) 5651 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 5652 else 5653 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 5654 break; 5655 case 'c': 5656 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 5657 if (Signed) 5658 Type = Context.SignedCharTy; 5659 else if (Unsigned) 5660 Type = Context.UnsignedCharTy; 5661 else 5662 Type = Context.CharTy; 5663 break; 5664 case 'b': // boolean 5665 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 5666 Type = Context.BoolTy; 5667 break; 5668 case 'z': // size_t. 5669 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 5670 Type = Context.getSizeType(); 5671 break; 5672 case 'F': 5673 Type = Context.getCFConstantStringType(); 5674 break; 5675 case 'G': 5676 Type = Context.getObjCIdType(); 5677 break; 5678 case 'H': 5679 Type = Context.getObjCSelType(); 5680 break; 5681 case 'a': 5682 Type = Context.getBuiltinVaListType(); 5683 assert(!Type.isNull() && "builtin va list type not initialized!"); 5684 break; 5685 case 'A': 5686 // This is a "reference" to a va_list; however, what exactly 5687 // this means depends on how va_list is defined. There are two 5688 // different kinds of va_list: ones passed by value, and ones 5689 // passed by reference. An example of a by-value va_list is 5690 // x86, where va_list is a char*. An example of by-ref va_list 5691 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 5692 // we want this argument to be a char*&; for x86-64, we want 5693 // it to be a __va_list_tag*. 5694 Type = Context.getBuiltinVaListType(); 5695 assert(!Type.isNull() && "builtin va list type not initialized!"); 5696 if (Type->isArrayType()) 5697 Type = Context.getArrayDecayedType(Type); 5698 else 5699 Type = Context.getLValueReferenceType(Type); 5700 break; 5701 case 'V': { 5702 char *End; 5703 unsigned NumElements = strtoul(Str, &End, 10); 5704 assert(End != Str && "Missing vector size"); 5705 Str = End; 5706 5707 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, 5708 RequiresICE, false); 5709 assert(!RequiresICE && "Can't require vector ICE"); 5710 5711 // TODO: No way to make AltiVec vectors in builtins yet. 5712 Type = Context.getVectorType(ElementType, NumElements, 5713 VectorType::GenericVector); 5714 break; 5715 } 5716 case 'X': { 5717 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, RequiresICE, 5718 false); 5719 assert(!RequiresICE && "Can't require complex ICE"); 5720 Type = Context.getComplexType(ElementType); 5721 break; 5722 } 5723 case 'P': 5724 Type = Context.getFILEType(); 5725 if (Type.isNull()) { 5726 Error = ASTContext::GE_Missing_stdio; 5727 return QualType(); 5728 } 5729 break; 5730 case 'J': 5731 if (Signed) 5732 Type = Context.getsigjmp_bufType(); 5733 else 5734 Type = Context.getjmp_bufType(); 5735 5736 if (Type.isNull()) { 5737 Error = ASTContext::GE_Missing_setjmp; 5738 return QualType(); 5739 } 5740 break; 5741 } 5742 5743 // If there are modifiers and if we're allowed to parse them, go for it. 5744 Done = !AllowTypeModifiers; 5745 while (!Done) { 5746 switch (char c = *Str++) { 5747 default: Done = true; --Str; break; 5748 case '*': 5749 case '&': { 5750 // Both pointers and references can have their pointee types 5751 // qualified with an address space. 5752 char *End; 5753 unsigned AddrSpace = strtoul(Str, &End, 10); 5754 if (End != Str && AddrSpace != 0) { 5755 Type = Context.getAddrSpaceQualType(Type, AddrSpace); 5756 Str = End; 5757 } 5758 if (c == '*') 5759 Type = Context.getPointerType(Type); 5760 else 5761 Type = Context.getLValueReferenceType(Type); 5762 break; 5763 } 5764 // FIXME: There's no way to have a built-in with an rvalue ref arg. 5765 case 'C': 5766 Type = Type.withConst(); 5767 break; 5768 case 'D': 5769 Type = Context.getVolatileType(Type); 5770 break; 5771 } 5772 } 5773 5774 assert((!RequiresICE || Type->isIntegralOrEnumerationType()) && 5775 "Integer constant 'I' type must be an integer"); 5776 5777 return Type; 5778} 5779 5780/// GetBuiltinType - Return the type for the specified builtin. 5781QualType ASTContext::GetBuiltinType(unsigned Id, 5782 GetBuiltinTypeError &Error, 5783 unsigned *IntegerConstantArgs) const { 5784 const char *TypeStr = BuiltinInfo.GetTypeString(Id); 5785 5786 llvm::SmallVector<QualType, 8> ArgTypes; 5787 5788 bool RequiresICE = false; 5789 Error = GE_None; 5790 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error, 5791 RequiresICE, true); 5792 if (Error != GE_None) 5793 return QualType(); 5794 5795 assert(!RequiresICE && "Result of intrinsic cannot be required to be an ICE"); 5796 5797 while (TypeStr[0] && TypeStr[0] != '.') { 5798 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error, RequiresICE, true); 5799 if (Error != GE_None) 5800 return QualType(); 5801 5802 // If this argument is required to be an IntegerConstantExpression and the 5803 // caller cares, fill in the bitmask we return. 5804 if (RequiresICE && IntegerConstantArgs) 5805 *IntegerConstantArgs |= 1 << ArgTypes.size(); 5806 5807 // Do array -> pointer decay. The builtin should use the decayed type. 5808 if (Ty->isArrayType()) 5809 Ty = getArrayDecayedType(Ty); 5810 5811 ArgTypes.push_back(Ty); 5812 } 5813 5814 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 5815 "'.' should only occur at end of builtin type list!"); 5816 5817 FunctionType::ExtInfo EI; 5818 if (BuiltinInfo.isNoReturn(Id)) EI = EI.withNoReturn(true); 5819 5820 bool Variadic = (TypeStr[0] == '.'); 5821 5822 // We really shouldn't be making a no-proto type here, especially in C++. 5823 if (ArgTypes.empty() && Variadic) 5824 return getFunctionNoProtoType(ResType, EI); 5825 5826 FunctionProtoType::ExtProtoInfo EPI; 5827 EPI.ExtInfo = EI; 5828 EPI.Variadic = Variadic; 5829 5830 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), EPI); 5831} 5832 5833GVALinkage ASTContext::GetGVALinkageForFunction(const FunctionDecl *FD) { 5834 GVALinkage External = GVA_StrongExternal; 5835 5836 Linkage L = FD->getLinkage(); 5837 switch (L) { 5838 case NoLinkage: 5839 case InternalLinkage: 5840 case UniqueExternalLinkage: 5841 return GVA_Internal; 5842 5843 case ExternalLinkage: 5844 switch (FD->getTemplateSpecializationKind()) { 5845 case TSK_Undeclared: 5846 case TSK_ExplicitSpecialization: 5847 External = GVA_StrongExternal; 5848 break; 5849 5850 case TSK_ExplicitInstantiationDefinition: 5851 return GVA_ExplicitTemplateInstantiation; 5852 5853 case TSK_ExplicitInstantiationDeclaration: 5854 case TSK_ImplicitInstantiation: 5855 External = GVA_TemplateInstantiation; 5856 break; 5857 } 5858 } 5859 5860 if (!FD->isInlined()) 5861 return External; 5862 5863 if (!getLangOptions().CPlusPlus || FD->hasAttr<GNUInlineAttr>()) { 5864 // GNU or C99 inline semantics. Determine whether this symbol should be 5865 // externally visible. 5866 if (FD->isInlineDefinitionExternallyVisible()) 5867 return External; 5868 5869 // C99 inline semantics, where the symbol is not externally visible. 5870 return GVA_C99Inline; 5871 } 5872 5873 // C++0x [temp.explicit]p9: 5874 // [ Note: The intent is that an inline function that is the subject of 5875 // an explicit instantiation declaration will still be implicitly 5876 // instantiated when used so that the body can be considered for 5877 // inlining, but that no out-of-line copy of the inline function would be 5878 // generated in the translation unit. -- end note ] 5879 if (FD->getTemplateSpecializationKind() 5880 == TSK_ExplicitInstantiationDeclaration) 5881 return GVA_C99Inline; 5882 5883 return GVA_CXXInline; 5884} 5885 5886GVALinkage ASTContext::GetGVALinkageForVariable(const VarDecl *VD) { 5887 // If this is a static data member, compute the kind of template 5888 // specialization. Otherwise, this variable is not part of a 5889 // template. 5890 TemplateSpecializationKind TSK = TSK_Undeclared; 5891 if (VD->isStaticDataMember()) 5892 TSK = VD->getTemplateSpecializationKind(); 5893 5894 Linkage L = VD->getLinkage(); 5895 if (L == ExternalLinkage && getLangOptions().CPlusPlus && 5896 VD->getType()->getLinkage() == UniqueExternalLinkage) 5897 L = UniqueExternalLinkage; 5898 5899 switch (L) { 5900 case NoLinkage: 5901 case InternalLinkage: 5902 case UniqueExternalLinkage: 5903 return GVA_Internal; 5904 5905 case ExternalLinkage: 5906 switch (TSK) { 5907 case TSK_Undeclared: 5908 case TSK_ExplicitSpecialization: 5909 return GVA_StrongExternal; 5910 5911 case TSK_ExplicitInstantiationDeclaration: 5912 llvm_unreachable("Variable should not be instantiated"); 5913 // Fall through to treat this like any other instantiation. 5914 5915 case TSK_ExplicitInstantiationDefinition: 5916 return GVA_ExplicitTemplateInstantiation; 5917 5918 case TSK_ImplicitInstantiation: 5919 return GVA_TemplateInstantiation; 5920 } 5921 } 5922 5923 return GVA_StrongExternal; 5924} 5925 5926bool ASTContext::DeclMustBeEmitted(const Decl *D) { 5927 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 5928 if (!VD->isFileVarDecl()) 5929 return false; 5930 } else if (!isa<FunctionDecl>(D)) 5931 return false; 5932 5933 // Weak references don't produce any output by themselves. 5934 if (D->hasAttr<WeakRefAttr>()) 5935 return false; 5936 5937 // Aliases and used decls are required. 5938 if (D->hasAttr<AliasAttr>() || D->hasAttr<UsedAttr>()) 5939 return true; 5940 5941 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 5942 // Forward declarations aren't required. 5943 if (!FD->isThisDeclarationADefinition()) 5944 return false; 5945 5946 // Constructors and destructors are required. 5947 if (FD->hasAttr<ConstructorAttr>() || FD->hasAttr<DestructorAttr>()) 5948 return true; 5949 5950 // The key function for a class is required. 5951 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 5952 const CXXRecordDecl *RD = MD->getParent(); 5953 if (MD->isOutOfLine() && RD->isDynamicClass()) { 5954 const CXXMethodDecl *KeyFunc = getKeyFunction(RD); 5955 if (KeyFunc && KeyFunc->getCanonicalDecl() == MD->getCanonicalDecl()) 5956 return true; 5957 } 5958 } 5959 5960 GVALinkage Linkage = GetGVALinkageForFunction(FD); 5961 5962 // static, static inline, always_inline, and extern inline functions can 5963 // always be deferred. Normal inline functions can be deferred in C99/C++. 5964 // Implicit template instantiations can also be deferred in C++. 5965 if (Linkage == GVA_Internal || Linkage == GVA_C99Inline || 5966 Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) 5967 return false; 5968 return true; 5969 } 5970 5971 const VarDecl *VD = cast<VarDecl>(D); 5972 assert(VD->isFileVarDecl() && "Expected file scoped var"); 5973 5974 if (VD->isThisDeclarationADefinition() == VarDecl::DeclarationOnly) 5975 return false; 5976 5977 // Structs that have non-trivial constructors or destructors are required. 5978 5979 // FIXME: Handle references. 5980 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 5981 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 5982 if (RD->hasDefinition() && 5983 (!RD->hasTrivialConstructor() || !RD->hasTrivialDestructor())) 5984 return true; 5985 } 5986 } 5987 5988 GVALinkage L = GetGVALinkageForVariable(VD); 5989 if (L == GVA_Internal || L == GVA_TemplateInstantiation) { 5990 if (!(VD->getInit() && VD->getInit()->HasSideEffects(*this))) 5991 return false; 5992 } 5993 5994 return true; 5995} 5996 5997CallingConv ASTContext::getDefaultMethodCallConv() { 5998 // Pass through to the C++ ABI object 5999 return ABI->getDefaultMethodCallConv(); 6000} 6001 6002bool ASTContext::isNearlyEmpty(const CXXRecordDecl *RD) const { 6003 // Pass through to the C++ ABI object 6004 return ABI->isNearlyEmpty(RD); 6005} 6006 6007MangleContext *ASTContext::createMangleContext() { 6008 switch (Target.getCXXABI()) { 6009 case CXXABI_ARM: 6010 case CXXABI_Itanium: 6011 return createItaniumMangleContext(*this, getDiagnostics()); 6012 case CXXABI_Microsoft: 6013 return createMicrosoftMangleContext(*this, getDiagnostics()); 6014 } 6015 assert(0 && "Unsupported ABI"); 6016 return 0; 6017} 6018 6019CXXABI::~CXXABI() {} 6020