Type.cpp revision 7426f793844407021ffeb5afcf917fff1a57f196
1//===--- Type.cpp - Type representation and manipulation ------------------===// 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 type-related functionality. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/CharUnits.h" 16#include "clang/AST/Type.h" 17#include "clang/AST/DeclCXX.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/AST/Expr.h" 21#include "clang/AST/PrettyPrinter.h" 22#include "clang/AST/TypeVisitor.h" 23#include "clang/Basic/Specifiers.h" 24#include "llvm/ADT/APSInt.h" 25#include "llvm/ADT/StringExtras.h" 26#include "llvm/Support/raw_ostream.h" 27#include <algorithm> 28using namespace clang; 29 30bool Qualifiers::isStrictSupersetOf(Qualifiers Other) const { 31 return (*this != Other) && 32 // CVR qualifiers superset 33 (((Mask & CVRMask) | (Other.Mask & CVRMask)) == (Mask & CVRMask)) && 34 // ObjC GC qualifiers superset 35 ((getObjCGCAttr() == Other.getObjCGCAttr()) || 36 (hasObjCGCAttr() && !Other.hasObjCGCAttr())) && 37 // Address space superset. 38 ((getAddressSpace() == Other.getAddressSpace()) || 39 (hasAddressSpace()&& !Other.hasAddressSpace())) && 40 // Lifetime qualifier superset. 41 ((getObjCLifetime() == Other.getObjCLifetime()) || 42 (hasObjCLifetime() && !Other.hasObjCLifetime())); 43} 44 45const IdentifierInfo* QualType::getBaseTypeIdentifier() const { 46 const Type* ty = getTypePtr(); 47 NamedDecl *ND = NULL; 48 if (ty->isPointerType() || ty->isReferenceType()) 49 return ty->getPointeeType().getBaseTypeIdentifier(); 50 else if (ty->isRecordType()) 51 ND = ty->getAs<RecordType>()->getDecl(); 52 else if (ty->isEnumeralType()) 53 ND = ty->getAs<EnumType>()->getDecl(); 54 else if (ty->getTypeClass() == Type::Typedef) 55 ND = ty->getAs<TypedefType>()->getDecl(); 56 else if (ty->isArrayType()) 57 return ty->castAsArrayTypeUnsafe()-> 58 getElementType().getBaseTypeIdentifier(); 59 60 if (ND) 61 return ND->getIdentifier(); 62 return NULL; 63} 64 65bool QualType::isConstant(QualType T, ASTContext &Ctx) { 66 if (T.isConstQualified()) 67 return true; 68 69 if (const ArrayType *AT = Ctx.getAsArrayType(T)) 70 return AT->getElementType().isConstant(Ctx); 71 72 return false; 73} 74 75unsigned ConstantArrayType::getNumAddressingBits(ASTContext &Context, 76 QualType ElementType, 77 const llvm::APInt &NumElements) { 78 llvm::APSInt SizeExtended(NumElements, true); 79 unsigned SizeTypeBits = Context.getTypeSize(Context.getSizeType()); 80 SizeExtended = SizeExtended.extend(std::max(SizeTypeBits, 81 SizeExtended.getBitWidth()) * 2); 82 83 uint64_t ElementSize 84 = Context.getTypeSizeInChars(ElementType).getQuantity(); 85 llvm::APSInt TotalSize(llvm::APInt(SizeExtended.getBitWidth(), ElementSize)); 86 TotalSize *= SizeExtended; 87 88 return TotalSize.getActiveBits(); 89} 90 91unsigned ConstantArrayType::getMaxSizeBits(ASTContext &Context) { 92 unsigned Bits = Context.getTypeSize(Context.getSizeType()); 93 94 // GCC appears to only allow 63 bits worth of address space when compiling 95 // for 64-bit, so we do the same. 96 if (Bits == 64) 97 --Bits; 98 99 return Bits; 100} 101 102DependentSizedArrayType::DependentSizedArrayType(const ASTContext &Context, 103 QualType et, QualType can, 104 Expr *e, ArraySizeModifier sm, 105 unsigned tq, 106 SourceRange brackets) 107 : ArrayType(DependentSizedArray, et, can, sm, tq, 108 (et->containsUnexpandedParameterPack() || 109 (e && e->containsUnexpandedParameterPack()))), 110 Context(Context), SizeExpr((Stmt*) e), Brackets(brackets) 111{ 112} 113 114void DependentSizedArrayType::Profile(llvm::FoldingSetNodeID &ID, 115 const ASTContext &Context, 116 QualType ET, 117 ArraySizeModifier SizeMod, 118 unsigned TypeQuals, 119 Expr *E) { 120 ID.AddPointer(ET.getAsOpaquePtr()); 121 ID.AddInteger(SizeMod); 122 ID.AddInteger(TypeQuals); 123 E->Profile(ID, Context, true); 124} 125 126DependentSizedExtVectorType::DependentSizedExtVectorType(const 127 ASTContext &Context, 128 QualType ElementType, 129 QualType can, 130 Expr *SizeExpr, 131 SourceLocation loc) 132 : Type(DependentSizedExtVector, can, /*Dependent=*/true, 133 /*InstantiationDependent=*/true, 134 ElementType->isVariablyModifiedType(), 135 (ElementType->containsUnexpandedParameterPack() || 136 (SizeExpr && SizeExpr->containsUnexpandedParameterPack()))), 137 Context(Context), SizeExpr(SizeExpr), ElementType(ElementType), 138 loc(loc) 139{ 140} 141 142void 143DependentSizedExtVectorType::Profile(llvm::FoldingSetNodeID &ID, 144 const ASTContext &Context, 145 QualType ElementType, Expr *SizeExpr) { 146 ID.AddPointer(ElementType.getAsOpaquePtr()); 147 SizeExpr->Profile(ID, Context, true); 148} 149 150VectorType::VectorType(QualType vecType, unsigned nElements, QualType canonType, 151 VectorKind vecKind) 152 : Type(Vector, canonType, vecType->isDependentType(), 153 vecType->isInstantiationDependentType(), 154 vecType->isVariablyModifiedType(), 155 vecType->containsUnexpandedParameterPack()), 156 ElementType(vecType) 157{ 158 VectorTypeBits.VecKind = vecKind; 159 VectorTypeBits.NumElements = nElements; 160} 161 162VectorType::VectorType(TypeClass tc, QualType vecType, unsigned nElements, 163 QualType canonType, VectorKind vecKind) 164 : Type(tc, canonType, vecType->isDependentType(), 165 vecType->isInstantiationDependentType(), 166 vecType->isVariablyModifiedType(), 167 vecType->containsUnexpandedParameterPack()), 168 ElementType(vecType) 169{ 170 VectorTypeBits.VecKind = vecKind; 171 VectorTypeBits.NumElements = nElements; 172} 173 174/// getArrayElementTypeNoTypeQual - If this is an array type, return the 175/// element type of the array, potentially with type qualifiers missing. 176/// This method should never be used when type qualifiers are meaningful. 177const Type *Type::getArrayElementTypeNoTypeQual() const { 178 // If this is directly an array type, return it. 179 if (const ArrayType *ATy = dyn_cast<ArrayType>(this)) 180 return ATy->getElementType().getTypePtr(); 181 182 // If the canonical form of this type isn't the right kind, reject it. 183 if (!isa<ArrayType>(CanonicalType)) 184 return 0; 185 186 // If this is a typedef for an array type, strip the typedef off without 187 // losing all typedef information. 188 return cast<ArrayType>(getUnqualifiedDesugaredType()) 189 ->getElementType().getTypePtr(); 190} 191 192/// getDesugaredType - Return the specified type with any "sugar" removed from 193/// the type. This takes off typedefs, typeof's etc. If the outer level of 194/// the type is already concrete, it returns it unmodified. This is similar 195/// to getting the canonical type, but it doesn't remove *all* typedefs. For 196/// example, it returns "T*" as "T*", (not as "int*"), because the pointer is 197/// concrete. 198QualType QualType::getDesugaredType(QualType T, const ASTContext &Context) { 199 SplitQualType split = getSplitDesugaredType(T); 200 return Context.getQualifiedType(split.first, split.second); 201} 202 203QualType QualType::getSingleStepDesugaredType(const ASTContext &Context) const { 204 QualifierCollector Qs; 205 206 const Type *CurTy = Qs.strip(*this); 207 switch (CurTy->getTypeClass()) { 208#define ABSTRACT_TYPE(Class, Parent) 209#define TYPE(Class, Parent) \ 210 case Type::Class: { \ 211 const Class##Type *Ty = cast<Class##Type>(CurTy); \ 212 if (!Ty->isSugared()) \ 213 return *this; \ 214 return Context.getQualifiedType(Ty->desugar(), Qs); \ 215 break; \ 216 } 217#include "clang/AST/TypeNodes.def" 218 } 219 220 return *this; 221} 222 223SplitQualType QualType::getSplitDesugaredType(QualType T) { 224 QualifierCollector Qs; 225 226 QualType Cur = T; 227 while (true) { 228 const Type *CurTy = Qs.strip(Cur); 229 switch (CurTy->getTypeClass()) { 230#define ABSTRACT_TYPE(Class, Parent) 231#define TYPE(Class, Parent) \ 232 case Type::Class: { \ 233 const Class##Type *Ty = cast<Class##Type>(CurTy); \ 234 if (!Ty->isSugared()) \ 235 return SplitQualType(Ty, Qs); \ 236 Cur = Ty->desugar(); \ 237 break; \ 238 } 239#include "clang/AST/TypeNodes.def" 240 } 241 } 242} 243 244SplitQualType QualType::getSplitUnqualifiedTypeImpl(QualType type) { 245 SplitQualType split = type.split(); 246 247 // All the qualifiers we've seen so far. 248 Qualifiers quals = split.second; 249 250 // The last type node we saw with any nodes inside it. 251 const Type *lastTypeWithQuals = split.first; 252 253 while (true) { 254 QualType next; 255 256 // Do a single-step desugar, aborting the loop if the type isn't 257 // sugared. 258 switch (split.first->getTypeClass()) { 259#define ABSTRACT_TYPE(Class, Parent) 260#define TYPE(Class, Parent) \ 261 case Type::Class: { \ 262 const Class##Type *ty = cast<Class##Type>(split.first); \ 263 if (!ty->isSugared()) goto done; \ 264 next = ty->desugar(); \ 265 break; \ 266 } 267#include "clang/AST/TypeNodes.def" 268 } 269 270 // Otherwise, split the underlying type. If that yields qualifiers, 271 // update the information. 272 split = next.split(); 273 if (!split.second.empty()) { 274 lastTypeWithQuals = split.first; 275 quals.addConsistentQualifiers(split.second); 276 } 277 } 278 279 done: 280 return SplitQualType(lastTypeWithQuals, quals); 281} 282 283QualType QualType::IgnoreParens(QualType T) { 284 // FIXME: this seems inherently un-qualifiers-safe. 285 while (const ParenType *PT = T->getAs<ParenType>()) 286 T = PT->getInnerType(); 287 return T; 288} 289 290/// getUnqualifiedDesugaredType - Pull any qualifiers and syntactic 291/// sugar off the given type. This should produce an object of the 292/// same dynamic type as the canonical type. 293const Type *Type::getUnqualifiedDesugaredType() const { 294 const Type *Cur = this; 295 296 while (true) { 297 switch (Cur->getTypeClass()) { 298#define ABSTRACT_TYPE(Class, Parent) 299#define TYPE(Class, Parent) \ 300 case Class: { \ 301 const Class##Type *Ty = cast<Class##Type>(Cur); \ 302 if (!Ty->isSugared()) return Cur; \ 303 Cur = Ty->desugar().getTypePtr(); \ 304 break; \ 305 } 306#include "clang/AST/TypeNodes.def" 307 } 308 } 309} 310 311/// isVoidType - Helper method to determine if this is the 'void' type. 312bool Type::isVoidType() const { 313 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 314 return BT->getKind() == BuiltinType::Void; 315 return false; 316} 317 318bool Type::isDerivedType() const { 319 switch (CanonicalType->getTypeClass()) { 320 case Pointer: 321 case VariableArray: 322 case ConstantArray: 323 case IncompleteArray: 324 case FunctionProto: 325 case FunctionNoProto: 326 case LValueReference: 327 case RValueReference: 328 case Record: 329 return true; 330 default: 331 return false; 332 } 333} 334bool Type::isClassType() const { 335 if (const RecordType *RT = getAs<RecordType>()) 336 return RT->getDecl()->isClass(); 337 return false; 338} 339bool Type::isStructureType() const { 340 if (const RecordType *RT = getAs<RecordType>()) 341 return RT->getDecl()->isStruct(); 342 return false; 343} 344bool Type::isStructureOrClassType() const { 345 if (const RecordType *RT = getAs<RecordType>()) 346 return RT->getDecl()->isStruct() || RT->getDecl()->isClass(); 347 return false; 348} 349bool Type::isVoidPointerType() const { 350 if (const PointerType *PT = getAs<PointerType>()) 351 return PT->getPointeeType()->isVoidType(); 352 return false; 353} 354 355bool Type::isUnionType() const { 356 if (const RecordType *RT = getAs<RecordType>()) 357 return RT->getDecl()->isUnion(); 358 return false; 359} 360 361bool Type::isComplexType() const { 362 if (const ComplexType *CT = dyn_cast<ComplexType>(CanonicalType)) 363 return CT->getElementType()->isFloatingType(); 364 return false; 365} 366 367bool Type::isComplexIntegerType() const { 368 // Check for GCC complex integer extension. 369 return getAsComplexIntegerType(); 370} 371 372const ComplexType *Type::getAsComplexIntegerType() const { 373 if (const ComplexType *Complex = getAs<ComplexType>()) 374 if (Complex->getElementType()->isIntegerType()) 375 return Complex; 376 return 0; 377} 378 379QualType Type::getPointeeType() const { 380 if (const PointerType *PT = getAs<PointerType>()) 381 return PT->getPointeeType(); 382 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 383 return OPT->getPointeeType(); 384 if (const BlockPointerType *BPT = getAs<BlockPointerType>()) 385 return BPT->getPointeeType(); 386 if (const ReferenceType *RT = getAs<ReferenceType>()) 387 return RT->getPointeeType(); 388 return QualType(); 389} 390 391const RecordType *Type::getAsStructureType() const { 392 // If this is directly a structure type, return it. 393 if (const RecordType *RT = dyn_cast<RecordType>(this)) { 394 if (RT->getDecl()->isStruct()) 395 return RT; 396 } 397 398 // If the canonical form of this type isn't the right kind, reject it. 399 if (const RecordType *RT = dyn_cast<RecordType>(CanonicalType)) { 400 if (!RT->getDecl()->isStruct()) 401 return 0; 402 403 // If this is a typedef for a structure type, strip the typedef off without 404 // losing all typedef information. 405 return cast<RecordType>(getUnqualifiedDesugaredType()); 406 } 407 return 0; 408} 409 410const RecordType *Type::getAsUnionType() const { 411 // If this is directly a union type, return it. 412 if (const RecordType *RT = dyn_cast<RecordType>(this)) { 413 if (RT->getDecl()->isUnion()) 414 return RT; 415 } 416 417 // If the canonical form of this type isn't the right kind, reject it. 418 if (const RecordType *RT = dyn_cast<RecordType>(CanonicalType)) { 419 if (!RT->getDecl()->isUnion()) 420 return 0; 421 422 // If this is a typedef for a union type, strip the typedef off without 423 // losing all typedef information. 424 return cast<RecordType>(getUnqualifiedDesugaredType()); 425 } 426 427 return 0; 428} 429 430ObjCObjectType::ObjCObjectType(QualType Canonical, QualType Base, 431 ObjCProtocolDecl * const *Protocols, 432 unsigned NumProtocols) 433 : Type(ObjCObject, Canonical, false, false, false, false), 434 BaseType(Base) 435{ 436 ObjCObjectTypeBits.NumProtocols = NumProtocols; 437 assert(getNumProtocols() == NumProtocols && 438 "bitfield overflow in protocol count"); 439 if (NumProtocols) 440 memcpy(getProtocolStorage(), Protocols, 441 NumProtocols * sizeof(ObjCProtocolDecl*)); 442} 443 444const ObjCObjectType *Type::getAsObjCQualifiedInterfaceType() const { 445 // There is no sugar for ObjCObjectType's, just return the canonical 446 // type pointer if it is the right class. There is no typedef information to 447 // return and these cannot be Address-space qualified. 448 if (const ObjCObjectType *T = getAs<ObjCObjectType>()) 449 if (T->getNumProtocols() && T->getInterface()) 450 return T; 451 return 0; 452} 453 454bool Type::isObjCQualifiedInterfaceType() const { 455 return getAsObjCQualifiedInterfaceType() != 0; 456} 457 458const ObjCObjectPointerType *Type::getAsObjCQualifiedIdType() const { 459 // There is no sugar for ObjCQualifiedIdType's, just return the canonical 460 // type pointer if it is the right class. 461 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) { 462 if (OPT->isObjCQualifiedIdType()) 463 return OPT; 464 } 465 return 0; 466} 467 468const ObjCObjectPointerType *Type::getAsObjCQualifiedClassType() const { 469 // There is no sugar for ObjCQualifiedClassType's, just return the canonical 470 // type pointer if it is the right class. 471 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) { 472 if (OPT->isObjCQualifiedClassType()) 473 return OPT; 474 } 475 return 0; 476} 477 478const ObjCObjectPointerType *Type::getAsObjCInterfacePointerType() const { 479 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) { 480 if (OPT->getInterfaceType()) 481 return OPT; 482 } 483 return 0; 484} 485 486const CXXRecordDecl *Type::getCXXRecordDeclForPointerType() const { 487 if (const PointerType *PT = getAs<PointerType>()) 488 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) 489 return dyn_cast<CXXRecordDecl>(RT->getDecl()); 490 return 0; 491} 492 493CXXRecordDecl *Type::getAsCXXRecordDecl() const { 494 if (const RecordType *RT = getAs<RecordType>()) 495 return dyn_cast<CXXRecordDecl>(RT->getDecl()); 496 else if (const InjectedClassNameType *Injected 497 = getAs<InjectedClassNameType>()) 498 return Injected->getDecl(); 499 500 return 0; 501} 502 503namespace { 504 class GetContainedAutoVisitor : 505 public TypeVisitor<GetContainedAutoVisitor, AutoType*> { 506 public: 507 using TypeVisitor<GetContainedAutoVisitor, AutoType*>::Visit; 508 AutoType *Visit(QualType T) { 509 if (T.isNull()) 510 return 0; 511 return Visit(T.getTypePtr()); 512 } 513 514 // The 'auto' type itself. 515 AutoType *VisitAutoType(const AutoType *AT) { 516 return const_cast<AutoType*>(AT); 517 } 518 519 // Only these types can contain the desired 'auto' type. 520 AutoType *VisitPointerType(const PointerType *T) { 521 return Visit(T->getPointeeType()); 522 } 523 AutoType *VisitBlockPointerType(const BlockPointerType *T) { 524 return Visit(T->getPointeeType()); 525 } 526 AutoType *VisitReferenceType(const ReferenceType *T) { 527 return Visit(T->getPointeeTypeAsWritten()); 528 } 529 AutoType *VisitMemberPointerType(const MemberPointerType *T) { 530 return Visit(T->getPointeeType()); 531 } 532 AutoType *VisitArrayType(const ArrayType *T) { 533 return Visit(T->getElementType()); 534 } 535 AutoType *VisitDependentSizedExtVectorType( 536 const DependentSizedExtVectorType *T) { 537 return Visit(T->getElementType()); 538 } 539 AutoType *VisitVectorType(const VectorType *T) { 540 return Visit(T->getElementType()); 541 } 542 AutoType *VisitFunctionType(const FunctionType *T) { 543 return Visit(T->getResultType()); 544 } 545 AutoType *VisitParenType(const ParenType *T) { 546 return Visit(T->getInnerType()); 547 } 548 AutoType *VisitAttributedType(const AttributedType *T) { 549 return Visit(T->getModifiedType()); 550 } 551 }; 552} 553 554AutoType *Type::getContainedAutoType() const { 555 return GetContainedAutoVisitor().Visit(this); 556} 557 558bool Type::isIntegerType() const { 559 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 560 return BT->getKind() >= BuiltinType::Bool && 561 BT->getKind() <= BuiltinType::Int128; 562 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) 563 // Incomplete enum types are not treated as integer types. 564 // FIXME: In C++, enum types are never integer types. 565 return ET->getDecl()->isComplete() && !ET->getDecl()->isScoped(); 566 return false; 567} 568 569bool Type::hasIntegerRepresentation() const { 570 if (const VectorType *VT = dyn_cast<VectorType>(CanonicalType)) 571 return VT->getElementType()->isIntegerType(); 572 else 573 return isIntegerType(); 574} 575 576/// \brief Determine whether this type is an integral type. 577/// 578/// This routine determines whether the given type is an integral type per 579/// C++ [basic.fundamental]p7. Although the C standard does not define the 580/// term "integral type", it has a similar term "integer type", and in C++ 581/// the two terms are equivalent. However, C's "integer type" includes 582/// enumeration types, while C++'s "integer type" does not. The \c ASTContext 583/// parameter is used to determine whether we should be following the C or 584/// C++ rules when determining whether this type is an integral/integer type. 585/// 586/// For cases where C permits "an integer type" and C++ permits "an integral 587/// type", use this routine. 588/// 589/// For cases where C permits "an integer type" and C++ permits "an integral 590/// or enumeration type", use \c isIntegralOrEnumerationType() instead. 591/// 592/// \param Ctx The context in which this type occurs. 593/// 594/// \returns true if the type is considered an integral type, false otherwise. 595bool Type::isIntegralType(ASTContext &Ctx) const { 596 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 597 return BT->getKind() >= BuiltinType::Bool && 598 BT->getKind() <= BuiltinType::Int128; 599 600 if (!Ctx.getLangOptions().CPlusPlus) 601 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) 602 return ET->getDecl()->isComplete(); // Complete enum types are integral in C. 603 604 return false; 605} 606 607bool Type::isIntegralOrEnumerationType() const { 608 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 609 return BT->getKind() >= BuiltinType::Bool && 610 BT->getKind() <= BuiltinType::Int128; 611 612 // Check for a complete enum type; incomplete enum types are not properly an 613 // enumeration type in the sense required here. 614 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) 615 return ET->getDecl()->isComplete(); 616 617 return false; 618} 619 620bool Type::isIntegralOrUnscopedEnumerationType() const { 621 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 622 return BT->getKind() >= BuiltinType::Bool && 623 BT->getKind() <= BuiltinType::Int128; 624 625 // Check for a complete enum type; incomplete enum types are not properly an 626 // enumeration type in the sense required here. 627 // C++0x: However, if the underlying type of the enum is fixed, it is 628 // considered complete. 629 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) 630 return ET->getDecl()->isComplete() && !ET->getDecl()->isScoped(); 631 632 return false; 633} 634 635 636bool Type::isBooleanType() const { 637 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 638 return BT->getKind() == BuiltinType::Bool; 639 return false; 640} 641 642bool Type::isCharType() const { 643 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 644 return BT->getKind() == BuiltinType::Char_U || 645 BT->getKind() == BuiltinType::UChar || 646 BT->getKind() == BuiltinType::Char_S || 647 BT->getKind() == BuiltinType::SChar; 648 return false; 649} 650 651bool Type::isWideCharType() const { 652 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 653 return BT->getKind() == BuiltinType::WChar_S || 654 BT->getKind() == BuiltinType::WChar_U; 655 return false; 656} 657 658bool Type::isChar16Type() const { 659 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 660 return BT->getKind() == BuiltinType::Char16; 661 return false; 662} 663 664bool Type::isChar32Type() const { 665 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 666 return BT->getKind() == BuiltinType::Char32; 667 return false; 668} 669 670/// \brief Determine whether this type is any of the built-in character 671/// types. 672bool Type::isAnyCharacterType() const { 673 const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType); 674 if (BT == 0) return false; 675 switch (BT->getKind()) { 676 default: return false; 677 case BuiltinType::Char_U: 678 case BuiltinType::UChar: 679 case BuiltinType::WChar_U: 680 case BuiltinType::Char16: 681 case BuiltinType::Char32: 682 case BuiltinType::Char_S: 683 case BuiltinType::SChar: 684 case BuiltinType::WChar_S: 685 return true; 686 } 687} 688 689/// isSignedIntegerType - Return true if this is an integer type that is 690/// signed, according to C99 6.2.5p4 [char, signed char, short, int, long..], 691/// an enum decl which has a signed representation 692bool Type::isSignedIntegerType() const { 693 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) { 694 return BT->getKind() >= BuiltinType::Char_S && 695 BT->getKind() <= BuiltinType::Int128; 696 } 697 698 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) { 699 // Incomplete enum types are not treated as integer types. 700 // FIXME: In C++, enum types are never integer types. 701 if (ET->getDecl()->isComplete() && !ET->getDecl()->isScoped()) 702 return ET->getDecl()->getIntegerType()->isSignedIntegerType(); 703 } 704 705 return false; 706} 707 708bool Type::isSignedIntegerOrEnumerationType() const { 709 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) { 710 return BT->getKind() >= BuiltinType::Char_S && 711 BT->getKind() <= BuiltinType::Int128; 712 } 713 714 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) { 715 if (ET->getDecl()->isComplete()) 716 return ET->getDecl()->getIntegerType()->isSignedIntegerType(); 717 } 718 719 return false; 720} 721 722bool Type::hasSignedIntegerRepresentation() const { 723 if (const VectorType *VT = dyn_cast<VectorType>(CanonicalType)) 724 return VT->getElementType()->isSignedIntegerType(); 725 else 726 return isSignedIntegerType(); 727} 728 729/// isUnsignedIntegerType - Return true if this is an integer type that is 730/// unsigned, according to C99 6.2.5p6 [which returns true for _Bool], an enum 731/// decl which has an unsigned representation 732bool Type::isUnsignedIntegerType() const { 733 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) { 734 return BT->getKind() >= BuiltinType::Bool && 735 BT->getKind() <= BuiltinType::UInt128; 736 } 737 738 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) { 739 // Incomplete enum types are not treated as integer types. 740 // FIXME: In C++, enum types are never integer types. 741 if (ET->getDecl()->isComplete() && !ET->getDecl()->isScoped()) 742 return ET->getDecl()->getIntegerType()->isUnsignedIntegerType(); 743 } 744 745 return false; 746} 747 748bool Type::isUnsignedIntegerOrEnumerationType() const { 749 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) { 750 return BT->getKind() >= BuiltinType::Bool && 751 BT->getKind() <= BuiltinType::UInt128; 752 } 753 754 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) { 755 if (ET->getDecl()->isComplete()) 756 return ET->getDecl()->getIntegerType()->isUnsignedIntegerType(); 757 } 758 759 return false; 760} 761 762bool Type::hasUnsignedIntegerRepresentation() const { 763 if (const VectorType *VT = dyn_cast<VectorType>(CanonicalType)) 764 return VT->getElementType()->isUnsignedIntegerType(); 765 else 766 return isUnsignedIntegerType(); 767} 768 769bool Type::isFloatingType() const { 770 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 771 return BT->getKind() >= BuiltinType::Float && 772 BT->getKind() <= BuiltinType::LongDouble; 773 if (const ComplexType *CT = dyn_cast<ComplexType>(CanonicalType)) 774 return CT->getElementType()->isFloatingType(); 775 return false; 776} 777 778bool Type::hasFloatingRepresentation() const { 779 if (const VectorType *VT = dyn_cast<VectorType>(CanonicalType)) 780 return VT->getElementType()->isFloatingType(); 781 else 782 return isFloatingType(); 783} 784 785bool Type::isRealFloatingType() const { 786 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 787 return BT->isFloatingPoint(); 788 return false; 789} 790 791bool Type::isRealType() const { 792 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 793 return BT->getKind() >= BuiltinType::Bool && 794 BT->getKind() <= BuiltinType::LongDouble; 795 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) 796 return ET->getDecl()->isComplete() && !ET->getDecl()->isScoped(); 797 return false; 798} 799 800bool Type::isArithmeticType() const { 801 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 802 return BT->getKind() >= BuiltinType::Bool && 803 BT->getKind() <= BuiltinType::LongDouble; 804 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) 805 // GCC allows forward declaration of enum types (forbid by C99 6.7.2.3p2). 806 // If a body isn't seen by the time we get here, return false. 807 // 808 // C++0x: Enumerations are not arithmetic types. For now, just return 809 // false for scoped enumerations since that will disable any 810 // unwanted implicit conversions. 811 return !ET->getDecl()->isScoped() && ET->getDecl()->isComplete(); 812 return isa<ComplexType>(CanonicalType); 813} 814 815bool Type::isScalarType() const { 816 if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) 817 return BT->getKind() > BuiltinType::Void && 818 BT->getKind() <= BuiltinType::NullPtr; 819 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) 820 // Enums are scalar types, but only if they are defined. Incomplete enums 821 // are not treated as scalar types. 822 return ET->getDecl()->isComplete(); 823 return isa<PointerType>(CanonicalType) || 824 isa<BlockPointerType>(CanonicalType) || 825 isa<MemberPointerType>(CanonicalType) || 826 isa<ComplexType>(CanonicalType) || 827 isa<ObjCObjectPointerType>(CanonicalType); 828} 829 830Type::ScalarTypeKind Type::getScalarTypeKind() const { 831 assert(isScalarType()); 832 833 const Type *T = CanonicalType.getTypePtr(); 834 if (const BuiltinType *BT = dyn_cast<BuiltinType>(T)) { 835 if (BT->getKind() == BuiltinType::Bool) return STK_Bool; 836 if (BT->getKind() == BuiltinType::NullPtr) return STK_CPointer; 837 if (BT->isInteger()) return STK_Integral; 838 if (BT->isFloatingPoint()) return STK_Floating; 839 llvm_unreachable("unknown scalar builtin type"); 840 } else if (isa<PointerType>(T)) { 841 return STK_CPointer; 842 } else if (isa<BlockPointerType>(T)) { 843 return STK_BlockPointer; 844 } else if (isa<ObjCObjectPointerType>(T)) { 845 return STK_ObjCObjectPointer; 846 } else if (isa<MemberPointerType>(T)) { 847 return STK_MemberPointer; 848 } else if (isa<EnumType>(T)) { 849 assert(cast<EnumType>(T)->getDecl()->isComplete()); 850 return STK_Integral; 851 } else if (const ComplexType *CT = dyn_cast<ComplexType>(T)) { 852 if (CT->getElementType()->isRealFloatingType()) 853 return STK_FloatingComplex; 854 return STK_IntegralComplex; 855 } 856 857 llvm_unreachable("unknown scalar type"); 858} 859 860/// \brief Determines whether the type is a C++ aggregate type or C 861/// aggregate or union type. 862/// 863/// An aggregate type is an array or a class type (struct, union, or 864/// class) that has no user-declared constructors, no private or 865/// protected non-static data members, no base classes, and no virtual 866/// functions (C++ [dcl.init.aggr]p1). The notion of an aggregate type 867/// subsumes the notion of C aggregates (C99 6.2.5p21) because it also 868/// includes union types. 869bool Type::isAggregateType() const { 870 if (const RecordType *Record = dyn_cast<RecordType>(CanonicalType)) { 871 if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(Record->getDecl())) 872 return ClassDecl->isAggregate(); 873 874 return true; 875 } 876 877 return isa<ArrayType>(CanonicalType); 878} 879 880/// isConstantSizeType - Return true if this is not a variable sized type, 881/// according to the rules of C99 6.7.5p3. It is not legal to call this on 882/// incomplete types or dependent types. 883bool Type::isConstantSizeType() const { 884 assert(!isIncompleteType() && "This doesn't make sense for incomplete types"); 885 assert(!isDependentType() && "This doesn't make sense for dependent types"); 886 // The VAT must have a size, as it is known to be complete. 887 return !isa<VariableArrayType>(CanonicalType); 888} 889 890/// isIncompleteType - Return true if this is an incomplete type (C99 6.2.5p1) 891/// - a type that can describe objects, but which lacks information needed to 892/// determine its size. 893bool Type::isIncompleteType() const { 894 switch (CanonicalType->getTypeClass()) { 895 default: return false; 896 case Builtin: 897 // Void is the only incomplete builtin type. Per C99 6.2.5p19, it can never 898 // be completed. 899 return isVoidType(); 900 case Enum: 901 // An enumeration with fixed underlying type is complete (C++0x 7.2p3). 902 if (cast<EnumType>(CanonicalType)->getDecl()->isFixed()) 903 return false; 904 // Fall through. 905 case Record: 906 // A tagged type (struct/union/enum/class) is incomplete if the decl is a 907 // forward declaration, but not a full definition (C99 6.2.5p22). 908 return !cast<TagType>(CanonicalType)->getDecl()->isDefinition(); 909 case ConstantArray: 910 // An array is incomplete if its element type is incomplete 911 // (C++ [dcl.array]p1). 912 // We don't handle variable arrays (they're not allowed in C++) or 913 // dependent-sized arrays (dependent types are never treated as incomplete). 914 return cast<ArrayType>(CanonicalType)->getElementType()->isIncompleteType(); 915 case IncompleteArray: 916 // An array of unknown size is an incomplete type (C99 6.2.5p22). 917 return true; 918 case ObjCObject: 919 return cast<ObjCObjectType>(CanonicalType)->getBaseType() 920 ->isIncompleteType(); 921 case ObjCInterface: 922 // ObjC interfaces are incomplete if they are @class, not @interface. 923 return cast<ObjCInterfaceType>(CanonicalType)->getDecl()->isForwardDecl(); 924 } 925} 926 927bool QualType::isPODType(ASTContext &Context) const { 928 // The compiler shouldn't query this for incomplete types, but the user might. 929 // We return false for that case. Except for incomplete arrays of PODs, which 930 // are PODs according to the standard. 931 if (isNull()) 932 return 0; 933 934 if ((*this)->isIncompleteArrayType()) 935 return Context.getBaseElementType(*this).isPODType(Context); 936 937 if ((*this)->isIncompleteType()) 938 return false; 939 940 if (Context.getLangOptions().ObjCAutoRefCount) { 941 switch (getObjCLifetime()) { 942 case Qualifiers::OCL_ExplicitNone: 943 return true; 944 945 case Qualifiers::OCL_Strong: 946 case Qualifiers::OCL_Weak: 947 case Qualifiers::OCL_Autoreleasing: 948 return false; 949 950 case Qualifiers::OCL_None: 951 break; 952 } 953 } 954 955 QualType CanonicalType = getTypePtr()->CanonicalType; 956 switch (CanonicalType->getTypeClass()) { 957 // Everything not explicitly mentioned is not POD. 958 default: return false; 959 case Type::VariableArray: 960 case Type::ConstantArray: 961 // IncompleteArray is handled above. 962 return Context.getBaseElementType(*this).isPODType(Context); 963 964 case Type::ObjCObjectPointer: 965 case Type::BlockPointer: 966 case Type::Builtin: 967 case Type::Complex: 968 case Type::Pointer: 969 case Type::MemberPointer: 970 case Type::Vector: 971 case Type::ExtVector: 972 return true; 973 974 case Type::Enum: 975 return true; 976 977 case Type::Record: 978 if (CXXRecordDecl *ClassDecl 979 = dyn_cast<CXXRecordDecl>(cast<RecordType>(CanonicalType)->getDecl())) 980 return ClassDecl->isPOD(); 981 982 // C struct/union is POD. 983 return true; 984 } 985} 986 987bool QualType::isTrivialType(ASTContext &Context) const { 988 // The compiler shouldn't query this for incomplete types, but the user might. 989 // We return false for that case. Except for incomplete arrays of PODs, which 990 // are PODs according to the standard. 991 if (isNull()) 992 return 0; 993 994 if ((*this)->isArrayType()) 995 return Context.getBaseElementType(*this).isTrivialType(Context); 996 997 // Return false for incomplete types after skipping any incomplete array 998 // types which are expressly allowed by the standard and thus our API. 999 if ((*this)->isIncompleteType()) 1000 return false; 1001 1002 if (Context.getLangOptions().ObjCAutoRefCount) { 1003 switch (getObjCLifetime()) { 1004 case Qualifiers::OCL_ExplicitNone: 1005 return true; 1006 1007 case Qualifiers::OCL_Strong: 1008 case Qualifiers::OCL_Weak: 1009 case Qualifiers::OCL_Autoreleasing: 1010 return false; 1011 1012 case Qualifiers::OCL_None: 1013 if ((*this)->isObjCLifetimeType()) 1014 return false; 1015 break; 1016 } 1017 } 1018 1019 QualType CanonicalType = getTypePtr()->CanonicalType; 1020 if (CanonicalType->isDependentType()) 1021 return false; 1022 1023 // C++0x [basic.types]p9: 1024 // Scalar types, trivial class types, arrays of such types, and 1025 // cv-qualified versions of these types are collectively called trivial 1026 // types. 1027 1028 // As an extension, Clang treats vector types as Scalar types. 1029 if (CanonicalType->isScalarType() || CanonicalType->isVectorType()) 1030 return true; 1031 if (const RecordType *RT = CanonicalType->getAs<RecordType>()) { 1032 if (const CXXRecordDecl *ClassDecl = 1033 dyn_cast<CXXRecordDecl>(RT->getDecl())) { 1034 // C++0x [class]p5: 1035 // A trivial class is a class that has a trivial default constructor 1036 if (!ClassDecl->hasTrivialDefaultConstructor()) return false; 1037 // and is trivially copyable. 1038 if (!ClassDecl->isTriviallyCopyable()) return false; 1039 } 1040 1041 return true; 1042 } 1043 1044 // No other types can match. 1045 return false; 1046} 1047 1048bool QualType::isTriviallyCopyableType(ASTContext &Context) const { 1049 if ((*this)->isArrayType()) 1050 return Context.getBaseElementType(*this).isTrivialType(Context); 1051 1052 if (Context.getLangOptions().ObjCAutoRefCount) { 1053 switch (getObjCLifetime()) { 1054 case Qualifiers::OCL_ExplicitNone: 1055 return true; 1056 1057 case Qualifiers::OCL_Strong: 1058 case Qualifiers::OCL_Weak: 1059 case Qualifiers::OCL_Autoreleasing: 1060 return false; 1061 1062 case Qualifiers::OCL_None: 1063 if ((*this)->isObjCLifetimeType()) 1064 return false; 1065 break; 1066 } 1067 } 1068 1069 // C++0x [basic.types]p9 1070 // Scalar types, trivially copyable class types, arrays of such types, and 1071 // cv-qualified versions of these types are collectively called trivial 1072 // types. 1073 1074 QualType CanonicalType = getCanonicalType(); 1075 if (CanonicalType->isDependentType()) 1076 return false; 1077 1078 // Return false for incomplete types after skipping any incomplete array types 1079 // which are expressly allowed by the standard and thus our API. 1080 if (CanonicalType->isIncompleteType()) 1081 return false; 1082 1083 // As an extension, Clang treats vector types as Scalar types. 1084 if (CanonicalType->isScalarType() || CanonicalType->isVectorType()) 1085 return true; 1086 1087 if (const RecordType *RT = CanonicalType->getAs<RecordType>()) { 1088 if (const CXXRecordDecl *ClassDecl = 1089 dyn_cast<CXXRecordDecl>(RT->getDecl())) { 1090 if (!ClassDecl->isTriviallyCopyable()) return false; 1091 } 1092 1093 return true; 1094 } 1095 1096 // No other types can match. 1097 return false; 1098} 1099 1100 1101 1102bool Type::isLiteralType() const { 1103 if (isDependentType()) 1104 return false; 1105 1106 // C++0x [basic.types]p10: 1107 // A type is a literal type if it is: 1108 // [...] 1109 // -- an array of literal type. 1110 // Extension: variable arrays cannot be literal types, since they're 1111 // runtime-sized. 1112 if (isVariableArrayType()) 1113 return false; 1114 const Type *BaseTy = getBaseElementTypeUnsafe(); 1115 assert(BaseTy && "NULL element type"); 1116 1117 // Return false for incomplete types after skipping any incomplete array 1118 // types; those are expressly allowed by the standard and thus our API. 1119 if (BaseTy->isIncompleteType()) 1120 return false; 1121 1122 // Objective-C lifetime types are not literal types. 1123 if (BaseTy->isObjCRetainableType()) 1124 return false; 1125 1126 // C++0x [basic.types]p10: 1127 // A type is a literal type if it is: 1128 // -- a scalar type; or 1129 // As an extension, Clang treats vector types as literal types. 1130 if (BaseTy->isScalarType() || BaseTy->isVectorType()) 1131 return true; 1132 // -- a reference type; or 1133 if (BaseTy->isReferenceType()) 1134 return true; 1135 // -- a class type that has all of the following properties: 1136 if (const RecordType *RT = BaseTy->getAs<RecordType>()) { 1137 if (const CXXRecordDecl *ClassDecl = 1138 dyn_cast<CXXRecordDecl>(RT->getDecl())) { 1139 // -- a trivial destructor, 1140 if (!ClassDecl->hasTrivialDestructor()) 1141 return false; 1142 1143 // -- every constructor call and full-expression in the 1144 // brace-or-equal-initializers for non-static data members (if any) 1145 // is a constant expression, 1146 // We deliberately do not implement this restriction. It isn't necessary 1147 // and doesn't make any sense. 1148 1149 // -- it is an aggregate type or has at least one constexpr 1150 // constructor or constructor template that is not a copy or move 1151 // constructor, and 1152 if (!ClassDecl->isAggregate() && 1153 !ClassDecl->hasConstexprNonCopyMoveConstructor()) 1154 return false; 1155 1156 // -- all non-static data members and base classes of literal types 1157 if (ClassDecl->hasNonLiteralTypeFieldsOrBases()) 1158 return false; 1159 } 1160 1161 return true; 1162 } 1163 1164 return false; 1165} 1166 1167bool Type::isStandardLayoutType() const { 1168 if (isDependentType()) 1169 return false; 1170 1171 // C++0x [basic.types]p9: 1172 // Scalar types, standard-layout class types, arrays of such types, and 1173 // cv-qualified versions of these types are collectively called 1174 // standard-layout types. 1175 const Type *BaseTy = getBaseElementTypeUnsafe(); 1176 assert(BaseTy && "NULL element type"); 1177 1178 // Return false for incomplete types after skipping any incomplete array 1179 // types which are expressly allowed by the standard and thus our API. 1180 if (BaseTy->isIncompleteType()) 1181 return false; 1182 1183 // As an extension, Clang treats vector types as Scalar types. 1184 if (BaseTy->isScalarType() || BaseTy->isVectorType()) return true; 1185 if (const RecordType *RT = BaseTy->getAs<RecordType>()) { 1186 if (const CXXRecordDecl *ClassDecl = 1187 dyn_cast<CXXRecordDecl>(RT->getDecl())) 1188 if (!ClassDecl->isStandardLayout()) 1189 return false; 1190 1191 // Default to 'true' for non-C++ class types. 1192 // FIXME: This is a bit dubious, but plain C structs should trivially meet 1193 // all the requirements of standard layout classes. 1194 return true; 1195 } 1196 1197 // No other types can match. 1198 return false; 1199} 1200 1201// This is effectively the intersection of isTrivialType and 1202// isStandardLayoutType. We implement it directly to avoid redundant 1203// conversions from a type to a CXXRecordDecl. 1204bool QualType::isCXX11PODType(ASTContext &Context) const { 1205 const Type *ty = getTypePtr(); 1206 if (ty->isDependentType()) 1207 return false; 1208 1209 if (Context.getLangOptions().ObjCAutoRefCount) { 1210 switch (getObjCLifetime()) { 1211 case Qualifiers::OCL_ExplicitNone: 1212 return true; 1213 1214 case Qualifiers::OCL_Strong: 1215 case Qualifiers::OCL_Weak: 1216 case Qualifiers::OCL_Autoreleasing: 1217 return false; 1218 1219 case Qualifiers::OCL_None: 1220 if (ty->isObjCLifetimeType()) 1221 return false; 1222 break; 1223 } 1224 } 1225 1226 // C++11 [basic.types]p9: 1227 // Scalar types, POD classes, arrays of such types, and cv-qualified 1228 // versions of these types are collectively called trivial types. 1229 const Type *BaseTy = ty->getBaseElementTypeUnsafe(); 1230 assert(BaseTy && "NULL element type"); 1231 1232 // Return false for incomplete types after skipping any incomplete array 1233 // types which are expressly allowed by the standard and thus our API. 1234 if (BaseTy->isIncompleteType()) 1235 return false; 1236 1237 // As an extension, Clang treats vector types as Scalar types. 1238 if (BaseTy->isScalarType() || BaseTy->isVectorType()) return true; 1239 if (const RecordType *RT = BaseTy->getAs<RecordType>()) { 1240 if (const CXXRecordDecl *ClassDecl = 1241 dyn_cast<CXXRecordDecl>(RT->getDecl())) { 1242 // C++11 [class]p10: 1243 // A POD struct is a non-union class that is both a trivial class [...] 1244 if (!ClassDecl->isTrivial()) return false; 1245 1246 // C++11 [class]p10: 1247 // A POD struct is a non-union class that is both a trivial class and 1248 // a standard-layout class [...] 1249 if (!ClassDecl->isStandardLayout()) return false; 1250 1251 // C++11 [class]p10: 1252 // A POD struct is a non-union class that is both a trivial class and 1253 // a standard-layout class, and has no non-static data members of type 1254 // non-POD struct, non-POD union (or array of such types). [...] 1255 // 1256 // We don't directly query the recursive aspect as the requiremets for 1257 // both standard-layout classes and trivial classes apply recursively 1258 // already. 1259 } 1260 1261 return true; 1262 } 1263 1264 // No other types can match. 1265 return false; 1266} 1267 1268bool Type::isPromotableIntegerType() const { 1269 if (const BuiltinType *BT = getAs<BuiltinType>()) 1270 switch (BT->getKind()) { 1271 case BuiltinType::Bool: 1272 case BuiltinType::Char_S: 1273 case BuiltinType::Char_U: 1274 case BuiltinType::SChar: 1275 case BuiltinType::UChar: 1276 case BuiltinType::Short: 1277 case BuiltinType::UShort: 1278 return true; 1279 default: 1280 return false; 1281 } 1282 1283 // Enumerated types are promotable to their compatible integer types 1284 // (C99 6.3.1.1) a.k.a. its underlying type (C++ [conv.prom]p2). 1285 if (const EnumType *ET = getAs<EnumType>()){ 1286 if (this->isDependentType() || ET->getDecl()->getPromotionType().isNull() 1287 || ET->getDecl()->isScoped()) 1288 return false; 1289 1290 const BuiltinType *BT 1291 = ET->getDecl()->getPromotionType()->getAs<BuiltinType>(); 1292 return BT->getKind() == BuiltinType::Int 1293 || BT->getKind() == BuiltinType::UInt; 1294 } 1295 1296 return false; 1297} 1298 1299bool Type::isNullPtrType() const { 1300 if (const BuiltinType *BT = getAs<BuiltinType>()) 1301 return BT->getKind() == BuiltinType::NullPtr; 1302 return false; 1303} 1304 1305bool Type::isSpecifierType() const { 1306 // Note that this intentionally does not use the canonical type. 1307 switch (getTypeClass()) { 1308 case Builtin: 1309 case Record: 1310 case Enum: 1311 case Typedef: 1312 case Complex: 1313 case TypeOfExpr: 1314 case TypeOf: 1315 case TemplateTypeParm: 1316 case SubstTemplateTypeParm: 1317 case TemplateSpecialization: 1318 case Elaborated: 1319 case DependentName: 1320 case DependentTemplateSpecialization: 1321 case ObjCInterface: 1322 case ObjCObject: 1323 case ObjCObjectPointer: // FIXME: object pointers aren't really specifiers 1324 return true; 1325 default: 1326 return false; 1327 } 1328} 1329 1330ElaboratedTypeKeyword 1331TypeWithKeyword::getKeywordForTypeSpec(unsigned TypeSpec) { 1332 switch (TypeSpec) { 1333 default: return ETK_None; 1334 case TST_typename: return ETK_Typename; 1335 case TST_class: return ETK_Class; 1336 case TST_struct: return ETK_Struct; 1337 case TST_union: return ETK_Union; 1338 case TST_enum: return ETK_Enum; 1339 } 1340} 1341 1342TagTypeKind 1343TypeWithKeyword::getTagTypeKindForTypeSpec(unsigned TypeSpec) { 1344 switch(TypeSpec) { 1345 case TST_class: return TTK_Class; 1346 case TST_struct: return TTK_Struct; 1347 case TST_union: return TTK_Union; 1348 case TST_enum: return TTK_Enum; 1349 } 1350 1351 llvm_unreachable("Type specifier is not a tag type kind."); 1352 return TTK_Union; 1353} 1354 1355ElaboratedTypeKeyword 1356TypeWithKeyword::getKeywordForTagTypeKind(TagTypeKind Kind) { 1357 switch (Kind) { 1358 case TTK_Class: return ETK_Class; 1359 case TTK_Struct: return ETK_Struct; 1360 case TTK_Union: return ETK_Union; 1361 case TTK_Enum: return ETK_Enum; 1362 } 1363 llvm_unreachable("Unknown tag type kind."); 1364} 1365 1366TagTypeKind 1367TypeWithKeyword::getTagTypeKindForKeyword(ElaboratedTypeKeyword Keyword) { 1368 switch (Keyword) { 1369 case ETK_Class: return TTK_Class; 1370 case ETK_Struct: return TTK_Struct; 1371 case ETK_Union: return TTK_Union; 1372 case ETK_Enum: return TTK_Enum; 1373 case ETK_None: // Fall through. 1374 case ETK_Typename: 1375 llvm_unreachable("Elaborated type keyword is not a tag type kind."); 1376 } 1377 llvm_unreachable("Unknown elaborated type keyword."); 1378} 1379 1380bool 1381TypeWithKeyword::KeywordIsTagTypeKind(ElaboratedTypeKeyword Keyword) { 1382 switch (Keyword) { 1383 case ETK_None: 1384 case ETK_Typename: 1385 return false; 1386 case ETK_Class: 1387 case ETK_Struct: 1388 case ETK_Union: 1389 case ETK_Enum: 1390 return true; 1391 } 1392 llvm_unreachable("Unknown elaborated type keyword."); 1393} 1394 1395const char* 1396TypeWithKeyword::getKeywordName(ElaboratedTypeKeyword Keyword) { 1397 switch (Keyword) { 1398 case ETK_None: return ""; 1399 case ETK_Typename: return "typename"; 1400 case ETK_Class: return "class"; 1401 case ETK_Struct: return "struct"; 1402 case ETK_Union: return "union"; 1403 case ETK_Enum: return "enum"; 1404 } 1405 1406 llvm_unreachable("Unknown elaborated type keyword."); 1407 return ""; 1408} 1409 1410DependentTemplateSpecializationType::DependentTemplateSpecializationType( 1411 ElaboratedTypeKeyword Keyword, 1412 NestedNameSpecifier *NNS, const IdentifierInfo *Name, 1413 unsigned NumArgs, const TemplateArgument *Args, 1414 QualType Canon) 1415 : TypeWithKeyword(Keyword, DependentTemplateSpecialization, Canon, true, true, 1416 /*VariablyModified=*/false, 1417 NNS && NNS->containsUnexpandedParameterPack()), 1418 NNS(NNS), Name(Name), NumArgs(NumArgs) { 1419 assert((!NNS || NNS->isDependent()) && 1420 "DependentTemplateSpecializatonType requires dependent qualifier"); 1421 for (unsigned I = 0; I != NumArgs; ++I) { 1422 if (Args[I].containsUnexpandedParameterPack()) 1423 setContainsUnexpandedParameterPack(); 1424 1425 new (&getArgBuffer()[I]) TemplateArgument(Args[I]); 1426 } 1427} 1428 1429void 1430DependentTemplateSpecializationType::Profile(llvm::FoldingSetNodeID &ID, 1431 const ASTContext &Context, 1432 ElaboratedTypeKeyword Keyword, 1433 NestedNameSpecifier *Qualifier, 1434 const IdentifierInfo *Name, 1435 unsigned NumArgs, 1436 const TemplateArgument *Args) { 1437 ID.AddInteger(Keyword); 1438 ID.AddPointer(Qualifier); 1439 ID.AddPointer(Name); 1440 for (unsigned Idx = 0; Idx < NumArgs; ++Idx) 1441 Args[Idx].Profile(ID, Context); 1442} 1443 1444bool Type::isElaboratedTypeSpecifier() const { 1445 ElaboratedTypeKeyword Keyword; 1446 if (const ElaboratedType *Elab = dyn_cast<ElaboratedType>(this)) 1447 Keyword = Elab->getKeyword(); 1448 else if (const DependentNameType *DepName = dyn_cast<DependentNameType>(this)) 1449 Keyword = DepName->getKeyword(); 1450 else if (const DependentTemplateSpecializationType *DepTST = 1451 dyn_cast<DependentTemplateSpecializationType>(this)) 1452 Keyword = DepTST->getKeyword(); 1453 else 1454 return false; 1455 1456 return TypeWithKeyword::KeywordIsTagTypeKind(Keyword); 1457} 1458 1459const char *Type::getTypeClassName() const { 1460 switch (TypeBits.TC) { 1461#define ABSTRACT_TYPE(Derived, Base) 1462#define TYPE(Derived, Base) case Derived: return #Derived; 1463#include "clang/AST/TypeNodes.def" 1464 } 1465 1466 llvm_unreachable("Invalid type class."); 1467 return 0; 1468} 1469 1470const char *BuiltinType::getName(const PrintingPolicy &Policy) const { 1471 switch (getKind()) { 1472 case Void: return "void"; 1473 case Bool: return Policy.Bool ? "bool" : "_Bool"; 1474 case Char_S: return "char"; 1475 case Char_U: return "char"; 1476 case SChar: return "signed char"; 1477 case Short: return "short"; 1478 case Int: return "int"; 1479 case Long: return "long"; 1480 case LongLong: return "long long"; 1481 case Int128: return "__int128_t"; 1482 case UChar: return "unsigned char"; 1483 case UShort: return "unsigned short"; 1484 case UInt: return "unsigned int"; 1485 case ULong: return "unsigned long"; 1486 case ULongLong: return "unsigned long long"; 1487 case UInt128: return "__uint128_t"; 1488 case Float: return "float"; 1489 case Double: return "double"; 1490 case LongDouble: return "long double"; 1491 case WChar_S: 1492 case WChar_U: return "wchar_t"; 1493 case Char16: return "char16_t"; 1494 case Char32: return "char32_t"; 1495 case NullPtr: return "nullptr_t"; 1496 case Overload: return "<overloaded function type>"; 1497 case BoundMember: return "<bound member function type>"; 1498 case Dependent: return "<dependent type>"; 1499 case UnknownAny: return "<unknown type>"; 1500 case ObjCId: return "id"; 1501 case ObjCClass: return "Class"; 1502 case ObjCSel: return "SEL"; 1503 } 1504 1505 llvm_unreachable("Invalid builtin type."); 1506 return 0; 1507} 1508 1509QualType QualType::getNonLValueExprType(ASTContext &Context) const { 1510 if (const ReferenceType *RefType = getTypePtr()->getAs<ReferenceType>()) 1511 return RefType->getPointeeType(); 1512 1513 // C++0x [basic.lval]: 1514 // Class prvalues can have cv-qualified types; non-class prvalues always 1515 // have cv-unqualified types. 1516 // 1517 // See also C99 6.3.2.1p2. 1518 if (!Context.getLangOptions().CPlusPlus || 1519 (!getTypePtr()->isDependentType() && !getTypePtr()->isRecordType())) 1520 return getUnqualifiedType(); 1521 1522 return *this; 1523} 1524 1525StringRef FunctionType::getNameForCallConv(CallingConv CC) { 1526 switch (CC) { 1527 case CC_Default: 1528 llvm_unreachable("no name for default cc"); 1529 return ""; 1530 1531 case CC_C: return "cdecl"; 1532 case CC_X86StdCall: return "stdcall"; 1533 case CC_X86FastCall: return "fastcall"; 1534 case CC_X86ThisCall: return "thiscall"; 1535 case CC_X86Pascal: return "pascal"; 1536 case CC_AAPCS: return "aapcs"; 1537 case CC_AAPCS_VFP: return "aapcs-vfp"; 1538 } 1539 1540 llvm_unreachable("Invalid calling convention."); 1541 return ""; 1542} 1543 1544FunctionProtoType::FunctionProtoType(QualType result, const QualType *args, 1545 unsigned numArgs, QualType canonical, 1546 const ExtProtoInfo &epi) 1547 : FunctionType(FunctionProto, result, epi.Variadic, epi.TypeQuals, 1548 epi.RefQualifier, canonical, 1549 result->isDependentType(), 1550 result->isInstantiationDependentType(), 1551 result->isVariablyModifiedType(), 1552 result->containsUnexpandedParameterPack(), 1553 epi.ExtInfo), 1554 NumArgs(numArgs), NumExceptions(epi.NumExceptions), 1555 ExceptionSpecType(epi.ExceptionSpecType), 1556 HasAnyConsumedArgs(epi.ConsumedArguments != 0) 1557{ 1558 // Fill in the trailing argument array. 1559 QualType *argSlot = reinterpret_cast<QualType*>(this+1); 1560 for (unsigned i = 0; i != numArgs; ++i) { 1561 if (args[i]->isDependentType()) 1562 setDependent(); 1563 else if (args[i]->isInstantiationDependentType()) 1564 setInstantiationDependent(); 1565 1566 if (args[i]->containsUnexpandedParameterPack()) 1567 setContainsUnexpandedParameterPack(); 1568 1569 argSlot[i] = args[i]; 1570 } 1571 1572 if (getExceptionSpecType() == EST_Dynamic) { 1573 // Fill in the exception array. 1574 QualType *exnSlot = argSlot + numArgs; 1575 for (unsigned i = 0, e = epi.NumExceptions; i != e; ++i) { 1576 if (epi.Exceptions[i]->isDependentType()) 1577 setDependent(); 1578 else if (epi.Exceptions[i]->isInstantiationDependentType()) 1579 setInstantiationDependent(); 1580 1581 if (epi.Exceptions[i]->containsUnexpandedParameterPack()) 1582 setContainsUnexpandedParameterPack(); 1583 1584 exnSlot[i] = epi.Exceptions[i]; 1585 } 1586 } else if (getExceptionSpecType() == EST_ComputedNoexcept) { 1587 // Store the noexcept expression and context. 1588 Expr **noexSlot = reinterpret_cast<Expr**>(argSlot + numArgs); 1589 *noexSlot = epi.NoexceptExpr; 1590 1591 if (epi.NoexceptExpr) { 1592 if (epi.NoexceptExpr->isValueDependent() 1593 || epi.NoexceptExpr->isTypeDependent()) 1594 setDependent(); 1595 else if (epi.NoexceptExpr->isInstantiationDependent()) 1596 setInstantiationDependent(); 1597 } 1598 } 1599 1600 if (epi.ConsumedArguments) { 1601 bool *consumedArgs = const_cast<bool*>(getConsumedArgsBuffer()); 1602 for (unsigned i = 0; i != numArgs; ++i) 1603 consumedArgs[i] = epi.ConsumedArguments[i]; 1604 } 1605} 1606 1607FunctionProtoType::NoexceptResult 1608FunctionProtoType::getNoexceptSpec(ASTContext &ctx) const { 1609 ExceptionSpecificationType est = getExceptionSpecType(); 1610 if (est == EST_BasicNoexcept) 1611 return NR_Nothrow; 1612 1613 if (est != EST_ComputedNoexcept) 1614 return NR_NoNoexcept; 1615 1616 Expr *noexceptExpr = getNoexceptExpr(); 1617 if (!noexceptExpr) 1618 return NR_BadNoexcept; 1619 if (noexceptExpr->isValueDependent()) 1620 return NR_Dependent; 1621 1622 llvm::APSInt value; 1623 bool isICE = noexceptExpr->isIntegerConstantExpr(value, ctx, 0, 1624 /*evaluated*/false); 1625 (void)isICE; 1626 assert(isICE && "AST should not contain bad noexcept expressions."); 1627 1628 return value.getBoolValue() ? NR_Nothrow : NR_Throw; 1629} 1630 1631bool FunctionProtoType::isTemplateVariadic() const { 1632 for (unsigned ArgIdx = getNumArgs(); ArgIdx; --ArgIdx) 1633 if (isa<PackExpansionType>(getArgType(ArgIdx - 1))) 1634 return true; 1635 1636 return false; 1637} 1638 1639void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID, QualType Result, 1640 const QualType *ArgTys, unsigned NumArgs, 1641 const ExtProtoInfo &epi, 1642 const ASTContext &Context) { 1643 1644 // We have to be careful not to get ambiguous profile encodings. 1645 // Note that valid type pointers are never ambiguous with anything else. 1646 // 1647 // The encoding grammar begins: 1648 // type type* bool int bool 1649 // If that final bool is true, then there is a section for the EH spec: 1650 // bool type* 1651 // This is followed by an optional "consumed argument" section of the 1652 // same length as the first type sequence: 1653 // bool* 1654 // Finally, we have the ext info: 1655 // int 1656 // 1657 // There is no ambiguity between the consumed arguments and an empty EH 1658 // spec because of the leading 'bool' which unambiguously indicates 1659 // whether the following bool is the EH spec or part of the arguments. 1660 1661 ID.AddPointer(Result.getAsOpaquePtr()); 1662 for (unsigned i = 0; i != NumArgs; ++i) 1663 ID.AddPointer(ArgTys[i].getAsOpaquePtr()); 1664 // This method is relatively performance sensitive, so as a performance 1665 // shortcut, use one AddInteger call instead of four for the next four 1666 // fields. 1667 assert(!(unsigned(epi.Variadic) & ~1) && 1668 !(unsigned(epi.TypeQuals) & ~255) && 1669 !(unsigned(epi.RefQualifier) & ~3) && 1670 !(unsigned(epi.ExceptionSpecType) & ~7) && 1671 "Values larger than expected."); 1672 ID.AddInteger(unsigned(epi.Variadic) + 1673 (epi.TypeQuals << 1) + 1674 (epi.RefQualifier << 9) + 1675 (epi.ExceptionSpecType << 11)); 1676 if (epi.ExceptionSpecType == EST_Dynamic) { 1677 for (unsigned i = 0; i != epi.NumExceptions; ++i) 1678 ID.AddPointer(epi.Exceptions[i].getAsOpaquePtr()); 1679 } else if (epi.ExceptionSpecType == EST_ComputedNoexcept && epi.NoexceptExpr){ 1680 epi.NoexceptExpr->Profile(ID, Context, false); 1681 } 1682 if (epi.ConsumedArguments) { 1683 for (unsigned i = 0; i != NumArgs; ++i) 1684 ID.AddBoolean(epi.ConsumedArguments[i]); 1685 } 1686 epi.ExtInfo.Profile(ID); 1687} 1688 1689void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID, 1690 const ASTContext &Ctx) { 1691 Profile(ID, getResultType(), arg_type_begin(), NumArgs, getExtProtoInfo(), 1692 Ctx); 1693} 1694 1695QualType TypedefType::desugar() const { 1696 return getDecl()->getUnderlyingType(); 1697} 1698 1699TypeOfExprType::TypeOfExprType(Expr *E, QualType can) 1700 : Type(TypeOfExpr, can, E->isTypeDependent(), 1701 E->isInstantiationDependent(), 1702 E->getType()->isVariablyModifiedType(), 1703 E->containsUnexpandedParameterPack()), 1704 TOExpr(E) { 1705} 1706 1707bool TypeOfExprType::isSugared() const { 1708 return !TOExpr->isTypeDependent(); 1709} 1710 1711QualType TypeOfExprType::desugar() const { 1712 if (isSugared()) 1713 return getUnderlyingExpr()->getType(); 1714 1715 return QualType(this, 0); 1716} 1717 1718void DependentTypeOfExprType::Profile(llvm::FoldingSetNodeID &ID, 1719 const ASTContext &Context, Expr *E) { 1720 E->Profile(ID, Context, true); 1721} 1722 1723DecltypeType::DecltypeType(Expr *E, QualType underlyingType, QualType can) 1724 : Type(Decltype, can, E->isTypeDependent(), 1725 E->isInstantiationDependent(), 1726 E->getType()->isVariablyModifiedType(), 1727 E->containsUnexpandedParameterPack()), 1728 E(E), 1729 UnderlyingType(underlyingType) { 1730} 1731 1732bool DecltypeType::isSugared() const { return !E->isInstantiationDependent(); } 1733 1734QualType DecltypeType::desugar() const { 1735 if (isSugared()) 1736 return getUnderlyingType(); 1737 1738 return QualType(this, 0); 1739} 1740 1741DependentDecltypeType::DependentDecltypeType(const ASTContext &Context, Expr *E) 1742 : DecltypeType(E, Context.DependentTy), Context(Context) { } 1743 1744void DependentDecltypeType::Profile(llvm::FoldingSetNodeID &ID, 1745 const ASTContext &Context, Expr *E) { 1746 E->Profile(ID, Context, true); 1747} 1748 1749TagType::TagType(TypeClass TC, const TagDecl *D, QualType can) 1750 : Type(TC, can, D->isDependentType(), 1751 /*InstantiationDependent=*/D->isDependentType(), 1752 /*VariablyModified=*/false, 1753 /*ContainsUnexpandedParameterPack=*/false), 1754 decl(const_cast<TagDecl*>(D)) {} 1755 1756static TagDecl *getInterestingTagDecl(TagDecl *decl) { 1757 for (TagDecl::redecl_iterator I = decl->redecls_begin(), 1758 E = decl->redecls_end(); 1759 I != E; ++I) { 1760 if (I->isDefinition() || I->isBeingDefined()) 1761 return *I; 1762 } 1763 // If there's no definition (not even in progress), return what we have. 1764 return decl; 1765} 1766 1767UnaryTransformType::UnaryTransformType(QualType BaseType, 1768 QualType UnderlyingType, 1769 UTTKind UKind, 1770 QualType CanonicalType) 1771 : Type(UnaryTransform, CanonicalType, UnderlyingType->isDependentType(), 1772 UnderlyingType->isInstantiationDependentType(), 1773 UnderlyingType->isVariablyModifiedType(), 1774 BaseType->containsUnexpandedParameterPack()) 1775 , BaseType(BaseType), UnderlyingType(UnderlyingType), UKind(UKind) 1776{} 1777 1778TagDecl *TagType::getDecl() const { 1779 return getInterestingTagDecl(decl); 1780} 1781 1782bool TagType::isBeingDefined() const { 1783 return getDecl()->isBeingDefined(); 1784} 1785 1786CXXRecordDecl *InjectedClassNameType::getDecl() const { 1787 return cast<CXXRecordDecl>(getInterestingTagDecl(Decl)); 1788} 1789 1790bool RecordType::classof(const TagType *TT) { 1791 return isa<RecordDecl>(TT->getDecl()); 1792} 1793 1794bool EnumType::classof(const TagType *TT) { 1795 return isa<EnumDecl>(TT->getDecl()); 1796} 1797 1798IdentifierInfo *TemplateTypeParmType::getIdentifier() const { 1799 return isCanonicalUnqualified() ? 0 : getDecl()->getIdentifier(); 1800} 1801 1802SubstTemplateTypeParmPackType:: 1803SubstTemplateTypeParmPackType(const TemplateTypeParmType *Param, 1804 QualType Canon, 1805 const TemplateArgument &ArgPack) 1806 : Type(SubstTemplateTypeParmPack, Canon, true, true, false, true), 1807 Replaced(Param), 1808 Arguments(ArgPack.pack_begin()), NumArguments(ArgPack.pack_size()) 1809{ 1810} 1811 1812TemplateArgument SubstTemplateTypeParmPackType::getArgumentPack() const { 1813 return TemplateArgument(Arguments, NumArguments); 1814} 1815 1816void SubstTemplateTypeParmPackType::Profile(llvm::FoldingSetNodeID &ID) { 1817 Profile(ID, getReplacedParameter(), getArgumentPack()); 1818} 1819 1820void SubstTemplateTypeParmPackType::Profile(llvm::FoldingSetNodeID &ID, 1821 const TemplateTypeParmType *Replaced, 1822 const TemplateArgument &ArgPack) { 1823 ID.AddPointer(Replaced); 1824 ID.AddInteger(ArgPack.pack_size()); 1825 for (TemplateArgument::pack_iterator P = ArgPack.pack_begin(), 1826 PEnd = ArgPack.pack_end(); 1827 P != PEnd; ++P) 1828 ID.AddPointer(P->getAsType().getAsOpaquePtr()); 1829} 1830 1831bool TemplateSpecializationType:: 1832anyDependentTemplateArguments(const TemplateArgumentListInfo &Args, 1833 bool &InstantiationDependent) { 1834 return anyDependentTemplateArguments(Args.getArgumentArray(), Args.size(), 1835 InstantiationDependent); 1836} 1837 1838bool TemplateSpecializationType:: 1839anyDependentTemplateArguments(const TemplateArgumentLoc *Args, unsigned N, 1840 bool &InstantiationDependent) { 1841 for (unsigned i = 0; i != N; ++i) { 1842 if (Args[i].getArgument().isDependent()) { 1843 InstantiationDependent = true; 1844 return true; 1845 } 1846 1847 if (Args[i].getArgument().isInstantiationDependent()) 1848 InstantiationDependent = true; 1849 } 1850 return false; 1851} 1852 1853bool TemplateSpecializationType:: 1854anyDependentTemplateArguments(const TemplateArgument *Args, unsigned N, 1855 bool &InstantiationDependent) { 1856 for (unsigned i = 0; i != N; ++i) { 1857 if (Args[i].isDependent()) { 1858 InstantiationDependent = true; 1859 return true; 1860 } 1861 1862 if (Args[i].isInstantiationDependent()) 1863 InstantiationDependent = true; 1864 } 1865 return false; 1866} 1867 1868TemplateSpecializationType:: 1869TemplateSpecializationType(TemplateName T, 1870 const TemplateArgument *Args, unsigned NumArgs, 1871 QualType Canon, QualType AliasedType) 1872 : Type(TemplateSpecialization, 1873 Canon.isNull()? QualType(this, 0) : Canon, 1874 Canon.isNull()? T.isDependent() : Canon->isDependentType(), 1875 Canon.isNull()? T.isDependent() 1876 : Canon->isInstantiationDependentType(), 1877 false, T.containsUnexpandedParameterPack()), 1878 Template(T), NumArgs(NumArgs) { 1879 assert(!T.getAsDependentTemplateName() && 1880 "Use DependentTemplateSpecializationType for dependent template-name"); 1881 assert((T.getKind() == TemplateName::Template || 1882 T.getKind() == TemplateName::SubstTemplateTemplateParm || 1883 T.getKind() == TemplateName::SubstTemplateTemplateParmPack) && 1884 "Unexpected template name for TemplateSpecializationType"); 1885 bool InstantiationDependent; 1886 (void)InstantiationDependent; 1887 assert((!Canon.isNull() || 1888 T.isDependent() || 1889 anyDependentTemplateArguments(Args, NumArgs, 1890 InstantiationDependent)) && 1891 "No canonical type for non-dependent class template specialization"); 1892 1893 TemplateArgument *TemplateArgs 1894 = reinterpret_cast<TemplateArgument *>(this + 1); 1895 for (unsigned Arg = 0; Arg < NumArgs; ++Arg) { 1896 // Update dependent and variably-modified bits. 1897 // If the canonical type exists and is non-dependent, the template 1898 // specialization type can be non-dependent even if one of the type 1899 // arguments is. Given: 1900 // template<typename T> using U = int; 1901 // U<T> is always non-dependent, irrespective of the type T. 1902 if (Canon.isNull() && Args[Arg].isDependent()) 1903 setDependent(); 1904 else if (Args[Arg].isInstantiationDependent()) 1905 setInstantiationDependent(); 1906 1907 if (Args[Arg].getKind() == TemplateArgument::Type && 1908 Args[Arg].getAsType()->isVariablyModifiedType()) 1909 setVariablyModified(); 1910 if (Args[Arg].containsUnexpandedParameterPack()) 1911 setContainsUnexpandedParameterPack(); 1912 1913 new (&TemplateArgs[Arg]) TemplateArgument(Args[Arg]); 1914 } 1915 1916 // Store the aliased type if this is a type alias template specialization. 1917 bool IsTypeAlias = !AliasedType.isNull(); 1918 assert(IsTypeAlias == isTypeAlias() && 1919 "allocated wrong size for type alias"); 1920 if (IsTypeAlias) { 1921 TemplateArgument *Begin = reinterpret_cast<TemplateArgument *>(this + 1); 1922 *reinterpret_cast<QualType*>(Begin + getNumArgs()) = AliasedType; 1923 } 1924} 1925 1926void 1927TemplateSpecializationType::Profile(llvm::FoldingSetNodeID &ID, 1928 TemplateName T, 1929 const TemplateArgument *Args, 1930 unsigned NumArgs, 1931 const ASTContext &Context) { 1932 T.Profile(ID); 1933 for (unsigned Idx = 0; Idx < NumArgs; ++Idx) 1934 Args[Idx].Profile(ID, Context); 1935} 1936 1937bool TemplateSpecializationType::isTypeAlias() const { 1938 TemplateDecl *D = Template.getAsTemplateDecl(); 1939 return D && isa<TypeAliasTemplateDecl>(D); 1940} 1941 1942QualType 1943QualifierCollector::apply(const ASTContext &Context, QualType QT) const { 1944 if (!hasNonFastQualifiers()) 1945 return QT.withFastQualifiers(getFastQualifiers()); 1946 1947 return Context.getQualifiedType(QT, *this); 1948} 1949 1950QualType 1951QualifierCollector::apply(const ASTContext &Context, const Type *T) const { 1952 if (!hasNonFastQualifiers()) 1953 return QualType(T, getFastQualifiers()); 1954 1955 return Context.getQualifiedType(T, *this); 1956} 1957 1958void ObjCObjectTypeImpl::Profile(llvm::FoldingSetNodeID &ID, 1959 QualType BaseType, 1960 ObjCProtocolDecl * const *Protocols, 1961 unsigned NumProtocols) { 1962 ID.AddPointer(BaseType.getAsOpaquePtr()); 1963 for (unsigned i = 0; i != NumProtocols; i++) 1964 ID.AddPointer(Protocols[i]); 1965} 1966 1967void ObjCObjectTypeImpl::Profile(llvm::FoldingSetNodeID &ID) { 1968 Profile(ID, getBaseType(), qual_begin(), getNumProtocols()); 1969} 1970 1971namespace { 1972 1973/// \brief The cached properties of a type. 1974class CachedProperties { 1975 char linkage; 1976 char visibility; 1977 bool local; 1978 1979public: 1980 CachedProperties(Linkage linkage, Visibility visibility, bool local) 1981 : linkage(linkage), visibility(visibility), local(local) {} 1982 1983 Linkage getLinkage() const { return (Linkage) linkage; } 1984 Visibility getVisibility() const { return (Visibility) visibility; } 1985 bool hasLocalOrUnnamedType() const { return local; } 1986 1987 friend CachedProperties merge(CachedProperties L, CachedProperties R) { 1988 return CachedProperties(minLinkage(L.getLinkage(), R.getLinkage()), 1989 minVisibility(L.getVisibility(), R.getVisibility()), 1990 L.hasLocalOrUnnamedType() | R.hasLocalOrUnnamedType()); 1991 } 1992}; 1993} 1994 1995static CachedProperties computeCachedProperties(const Type *T); 1996 1997namespace clang { 1998/// The type-property cache. This is templated so as to be 1999/// instantiated at an internal type to prevent unnecessary symbol 2000/// leakage. 2001template <class Private> class TypePropertyCache { 2002public: 2003 static CachedProperties get(QualType T) { 2004 return get(T.getTypePtr()); 2005 } 2006 2007 static CachedProperties get(const Type *T) { 2008 ensure(T); 2009 return CachedProperties(T->TypeBits.getLinkage(), 2010 T->TypeBits.getVisibility(), 2011 T->TypeBits.hasLocalOrUnnamedType()); 2012 } 2013 2014 static void ensure(const Type *T) { 2015 // If the cache is valid, we're okay. 2016 if (T->TypeBits.isCacheValid()) return; 2017 2018 // If this type is non-canonical, ask its canonical type for the 2019 // relevant information. 2020 if (!T->isCanonicalUnqualified()) { 2021 const Type *CT = T->getCanonicalTypeInternal().getTypePtr(); 2022 ensure(CT); 2023 T->TypeBits.CacheValidAndVisibility = 2024 CT->TypeBits.CacheValidAndVisibility; 2025 T->TypeBits.CachedLinkage = CT->TypeBits.CachedLinkage; 2026 T->TypeBits.CachedLocalOrUnnamed = CT->TypeBits.CachedLocalOrUnnamed; 2027 return; 2028 } 2029 2030 // Compute the cached properties and then set the cache. 2031 CachedProperties Result = computeCachedProperties(T); 2032 T->TypeBits.CacheValidAndVisibility = Result.getVisibility() + 1U; 2033 assert(T->TypeBits.isCacheValid() && 2034 T->TypeBits.getVisibility() == Result.getVisibility()); 2035 T->TypeBits.CachedLinkage = Result.getLinkage(); 2036 T->TypeBits.CachedLocalOrUnnamed = Result.hasLocalOrUnnamedType(); 2037 } 2038}; 2039} 2040 2041// Instantiate the friend template at a private class. In a 2042// reasonable implementation, these symbols will be internal. 2043// It is terrible that this is the best way to accomplish this. 2044namespace { class Private {}; } 2045typedef TypePropertyCache<Private> Cache; 2046 2047static CachedProperties computeCachedProperties(const Type *T) { 2048 switch (T->getTypeClass()) { 2049#define TYPE(Class,Base) 2050#define NON_CANONICAL_TYPE(Class,Base) case Type::Class: 2051#include "clang/AST/TypeNodes.def" 2052 llvm_unreachable("didn't expect a non-canonical type here"); 2053 2054#define TYPE(Class,Base) 2055#define DEPENDENT_TYPE(Class,Base) case Type::Class: 2056#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class,Base) case Type::Class: 2057#include "clang/AST/TypeNodes.def" 2058 // Treat instantiation-dependent types as external. 2059 assert(T->isInstantiationDependentType()); 2060 return CachedProperties(ExternalLinkage, DefaultVisibility, false); 2061 2062 case Type::Builtin: 2063 // C++ [basic.link]p8: 2064 // A type is said to have linkage if and only if: 2065 // - it is a fundamental type (3.9.1); or 2066 return CachedProperties(ExternalLinkage, DefaultVisibility, false); 2067 2068 case Type::Record: 2069 case Type::Enum: { 2070 const TagDecl *Tag = cast<TagType>(T)->getDecl(); 2071 2072 // C++ [basic.link]p8: 2073 // - it is a class or enumeration type that is named (or has a name 2074 // for linkage purposes (7.1.3)) and the name has linkage; or 2075 // - it is a specialization of a class template (14); or 2076 NamedDecl::LinkageInfo LV = Tag->getLinkageAndVisibility(); 2077 bool IsLocalOrUnnamed = 2078 Tag->getDeclContext()->isFunctionOrMethod() || 2079 (!Tag->getIdentifier() && !Tag->getTypedefNameForAnonDecl()); 2080 return CachedProperties(LV.linkage(), LV.visibility(), IsLocalOrUnnamed); 2081 } 2082 2083 // C++ [basic.link]p8: 2084 // - it is a compound type (3.9.2) other than a class or enumeration, 2085 // compounded exclusively from types that have linkage; or 2086 case Type::Complex: 2087 return Cache::get(cast<ComplexType>(T)->getElementType()); 2088 case Type::Pointer: 2089 return Cache::get(cast<PointerType>(T)->getPointeeType()); 2090 case Type::BlockPointer: 2091 return Cache::get(cast<BlockPointerType>(T)->getPointeeType()); 2092 case Type::LValueReference: 2093 case Type::RValueReference: 2094 return Cache::get(cast<ReferenceType>(T)->getPointeeType()); 2095 case Type::MemberPointer: { 2096 const MemberPointerType *MPT = cast<MemberPointerType>(T); 2097 return merge(Cache::get(MPT->getClass()), 2098 Cache::get(MPT->getPointeeType())); 2099 } 2100 case Type::ConstantArray: 2101 case Type::IncompleteArray: 2102 case Type::VariableArray: 2103 return Cache::get(cast<ArrayType>(T)->getElementType()); 2104 case Type::Vector: 2105 case Type::ExtVector: 2106 return Cache::get(cast<VectorType>(T)->getElementType()); 2107 case Type::FunctionNoProto: 2108 return Cache::get(cast<FunctionType>(T)->getResultType()); 2109 case Type::FunctionProto: { 2110 const FunctionProtoType *FPT = cast<FunctionProtoType>(T); 2111 CachedProperties result = Cache::get(FPT->getResultType()); 2112 for (FunctionProtoType::arg_type_iterator ai = FPT->arg_type_begin(), 2113 ae = FPT->arg_type_end(); ai != ae; ++ai) 2114 result = merge(result, Cache::get(*ai)); 2115 return result; 2116 } 2117 case Type::ObjCInterface: { 2118 NamedDecl::LinkageInfo LV = 2119 cast<ObjCInterfaceType>(T)->getDecl()->getLinkageAndVisibility(); 2120 return CachedProperties(LV.linkage(), LV.visibility(), false); 2121 } 2122 case Type::ObjCObject: 2123 return Cache::get(cast<ObjCObjectType>(T)->getBaseType()); 2124 case Type::ObjCObjectPointer: 2125 return Cache::get(cast<ObjCObjectPointerType>(T)->getPointeeType()); 2126 } 2127 2128 llvm_unreachable("unhandled type class"); 2129 2130 // C++ [basic.link]p8: 2131 // Names not covered by these rules have no linkage. 2132 return CachedProperties(NoLinkage, DefaultVisibility, false); 2133} 2134 2135/// \brief Determine the linkage of this type. 2136Linkage Type::getLinkage() const { 2137 Cache::ensure(this); 2138 return TypeBits.getLinkage(); 2139} 2140 2141/// \brief Determine the linkage of this type. 2142Visibility Type::getVisibility() const { 2143 Cache::ensure(this); 2144 return TypeBits.getVisibility(); 2145} 2146 2147bool Type::hasUnnamedOrLocalType() const { 2148 Cache::ensure(this); 2149 return TypeBits.hasLocalOrUnnamedType(); 2150} 2151 2152std::pair<Linkage,Visibility> Type::getLinkageAndVisibility() const { 2153 Cache::ensure(this); 2154 return std::make_pair(TypeBits.getLinkage(), TypeBits.getVisibility()); 2155} 2156 2157void Type::ClearLinkageCache() { 2158 TypeBits.CacheValidAndVisibility = 0; 2159 if (QualType(this, 0) != CanonicalType) 2160 CanonicalType->TypeBits.CacheValidAndVisibility = 0; 2161} 2162 2163Qualifiers::ObjCLifetime Type::getObjCARCImplicitLifetime() const { 2164 if (isObjCARCImplicitlyUnretainedType()) 2165 return Qualifiers::OCL_ExplicitNone; 2166 return Qualifiers::OCL_Strong; 2167} 2168 2169bool Type::isObjCARCImplicitlyUnretainedType() const { 2170 assert(isObjCLifetimeType() && 2171 "cannot query implicit lifetime for non-inferrable type"); 2172 2173 const Type *canon = getCanonicalTypeInternal().getTypePtr(); 2174 2175 // Walk down to the base type. We don't care about qualifiers for this. 2176 while (const ArrayType *array = dyn_cast<ArrayType>(canon)) 2177 canon = array->getElementType().getTypePtr(); 2178 2179 if (const ObjCObjectPointerType *opt 2180 = dyn_cast<ObjCObjectPointerType>(canon)) { 2181 // Class and Class<Protocol> don't require retension. 2182 if (opt->getObjectType()->isObjCClass()) 2183 return true; 2184 } 2185 2186 return false; 2187} 2188 2189bool Type::isObjCNSObjectType() const { 2190 if (const TypedefType *typedefType = dyn_cast<TypedefType>(this)) 2191 return typedefType->getDecl()->hasAttr<ObjCNSObjectAttr>(); 2192 return false; 2193} 2194bool Type::isObjCRetainableType() const { 2195 return isObjCObjectPointerType() || 2196 isBlockPointerType() || 2197 isObjCNSObjectType(); 2198} 2199bool Type::isObjCIndirectLifetimeType() const { 2200 if (isObjCLifetimeType()) 2201 return true; 2202 if (const PointerType *OPT = getAs<PointerType>()) 2203 return OPT->getPointeeType()->isObjCIndirectLifetimeType(); 2204 if (const ReferenceType *Ref = getAs<ReferenceType>()) 2205 return Ref->getPointeeType()->isObjCIndirectLifetimeType(); 2206 if (const MemberPointerType *MemPtr = getAs<MemberPointerType>()) 2207 return MemPtr->getPointeeType()->isObjCIndirectLifetimeType(); 2208 return false; 2209} 2210 2211/// Returns true if objects of this type have lifetime semantics under 2212/// ARC. 2213bool Type::isObjCLifetimeType() const { 2214 const Type *type = this; 2215 while (const ArrayType *array = type->getAsArrayTypeUnsafe()) 2216 type = array->getElementType().getTypePtr(); 2217 return type->isObjCRetainableType(); 2218} 2219 2220/// \brief Determine whether the given type T is a "bridgable" Objective-C type, 2221/// which is either an Objective-C object pointer type or an 2222bool Type::isObjCARCBridgableType() const { 2223 return isObjCObjectPointerType() || isBlockPointerType(); 2224} 2225 2226/// \brief Determine whether the given type T is a "bridgeable" C type. 2227bool Type::isCARCBridgableType() const { 2228 const PointerType *Pointer = getAs<PointerType>(); 2229 if (!Pointer) 2230 return false; 2231 2232 QualType Pointee = Pointer->getPointeeType(); 2233 return Pointee->isVoidType() || Pointee->isRecordType(); 2234} 2235 2236bool Type::hasSizedVLAType() const { 2237 if (!isVariablyModifiedType()) return false; 2238 2239 if (const PointerType *ptr = getAs<PointerType>()) 2240 return ptr->getPointeeType()->hasSizedVLAType(); 2241 if (const ReferenceType *ref = getAs<ReferenceType>()) 2242 return ref->getPointeeType()->hasSizedVLAType(); 2243 if (const ArrayType *arr = getAsArrayTypeUnsafe()) { 2244 if (isa<VariableArrayType>(arr) && 2245 cast<VariableArrayType>(arr)->getSizeExpr()) 2246 return true; 2247 2248 return arr->getElementType()->hasSizedVLAType(); 2249 } 2250 2251 return false; 2252} 2253 2254QualType::DestructionKind QualType::isDestructedTypeImpl(QualType type) { 2255 switch (type.getObjCLifetime()) { 2256 case Qualifiers::OCL_None: 2257 case Qualifiers::OCL_ExplicitNone: 2258 case Qualifiers::OCL_Autoreleasing: 2259 break; 2260 2261 case Qualifiers::OCL_Strong: 2262 return DK_objc_strong_lifetime; 2263 case Qualifiers::OCL_Weak: 2264 return DK_objc_weak_lifetime; 2265 } 2266 2267 /// Currently, the only destruction kind we recognize is C++ objects 2268 /// with non-trivial destructors. 2269 const CXXRecordDecl *record = 2270 type->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); 2271 if (record && record->hasDefinition() && !record->hasTrivialDestructor()) 2272 return DK_cxx_destructor; 2273 2274 return DK_none; 2275} 2276 2277bool QualType::hasTrivialAssignment(ASTContext &Context, bool Copying) const { 2278 switch (getObjCLifetime()) { 2279 case Qualifiers::OCL_None: 2280 break; 2281 2282 case Qualifiers::OCL_ExplicitNone: 2283 return true; 2284 2285 case Qualifiers::OCL_Autoreleasing: 2286 case Qualifiers::OCL_Strong: 2287 case Qualifiers::OCL_Weak: 2288 return !Context.getLangOptions().ObjCAutoRefCount; 2289 } 2290 2291 if (const CXXRecordDecl *Record 2292 = getTypePtr()->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) 2293 return Copying ? Record->hasTrivialCopyAssignment() : 2294 Record->hasTrivialMoveAssignment(); 2295 2296 return true; 2297} 2298