contrib/llvm/tools/clang/lib/AST/ExprCXX.cpp

   1 //===--- ExprCXX.cpp - (C++) Expression AST Node Implementation -----------===//
   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 subclesses of Expr class declared in ExprCXX.h
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "clang/AST/ASTContext.h"
  15 #include "clang/AST/Attr.h"
  16 #include "clang/AST/DeclCXX.h"
  17 #include "clang/AST/DeclTemplate.h"
  18 #include "clang/AST/ExprCXX.h"
  19 #include "clang/AST/TypeLoc.h"
  20 #include "clang/Basic/IdentifierTable.h"
  21 using namespace clang;
  22
  23
  24 //===----------------------------------------------------------------------===//
  25 //  Child Iterators for iterating over subexpressions/substatements
  26 //===----------------------------------------------------------------------===//
  27
  28 bool CXXTypeidExpr::isPotentiallyEvaluated() const {
  29   if (isTypeOperand())
  30     return false;
  31
  32   // C++11 [expr.typeid]p3:
  33   //   When typeid is applied to an expression other than a glvalue of
  34   //   polymorphic class type, [...] the expression is an unevaluated operand.
  35   const Expr *E = getExprOperand();
  36   if (const CXXRecordDecl *RD = E->getType()->getAsCXXRecordDecl())
  37     if (RD->isPolymorphic() && E->isGLValue())
  38       return true;
  39
  40   return false;
  41 }
  42
  43 QualType CXXTypeidExpr::getTypeOperand(ASTContext &Context) const {
  44   assert(isTypeOperand() && "Cannot call getTypeOperand for typeid(expr)");
  45   Qualifiers Quals;
  46   return Context.getUnqualifiedArrayType(
  47       Operand.get<TypeSourceInfo *>()->getType().getNonReferenceType(), Quals);
  48 }
  49
  50 QualType CXXUuidofExpr::getTypeOperand(ASTContext &Context) const {
  51   assert(isTypeOperand() && "Cannot call getTypeOperand for __uuidof(expr)");
  52   Qualifiers Quals;
  53   return Context.getUnqualifiedArrayType(
  54       Operand.get<TypeSourceInfo *>()->getType().getNonReferenceType(), Quals);
  55 }
  56
  57 // static
  58 const UuidAttr *CXXUuidofExpr::GetUuidAttrOfType(QualType QT,
  59                                                  bool *RDHasMultipleGUIDsPtr) {
  60   // Optionally remove one level of pointer, reference or array indirection.
  61   const Type *Ty = QT.getTypePtr();
  62   if (QT->isPointerType() || QT->isReferenceType())
  63     Ty = QT->getPointeeType().getTypePtr();
  64   else if (QT->isArrayType())
  65     Ty = Ty->getBaseElementTypeUnsafe();
  66
  67   const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
  68   if (!RD)
  69     return nullptr;
  70
  71   if (const UuidAttr *Uuid = RD->getMostRecentDecl()->getAttr<UuidAttr>())
  72     return Uuid;
  73
  74   // __uuidof can grab UUIDs from template arguments.
  75   if (const ClassTemplateSpecializationDecl *CTSD =
  76           dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
  77     const TemplateArgumentList &TAL = CTSD->getTemplateArgs();
  78     const UuidAttr *UuidForRD = nullptr;
  79
  80     for (const TemplateArgument &TA : TAL.asArray()) {
  81       bool SeenMultipleGUIDs = false;
  82
  83       const UuidAttr *UuidForTA = nullptr;
  84       if (TA.getKind() == TemplateArgument::Type)
  85         UuidForTA = GetUuidAttrOfType(TA.getAsType(), &SeenMultipleGUIDs);
  86       else if (TA.getKind() == TemplateArgument::Declaration)
  87         UuidForTA =
  88             GetUuidAttrOfType(TA.getAsDecl()->getType(), &SeenMultipleGUIDs);
  89
  90       // If the template argument has a UUID, there are three cases:
  91       //  - This is the first UUID seen for this RecordDecl.
  92       //  - This is a different UUID than previously seen for this RecordDecl.
  93       //  - This is the same UUID than previously seen for this RecordDecl.
  94       if (UuidForTA) {
  95         if (!UuidForRD)
  96           UuidForRD = UuidForTA;
  97         else if (UuidForRD != UuidForTA)
  98           SeenMultipleGUIDs = true;
  99       }
 100
 101       // Seeing multiple UUIDs means that we couldn't find a UUID
 102       if (SeenMultipleGUIDs) {
 103         if (RDHasMultipleGUIDsPtr)
 104           *RDHasMultipleGUIDsPtr = true;
 105         return nullptr;
 106       }
 107     }
 108
 109     return UuidForRD;
 110   }
 111
 112   return nullptr;
 113 }
 114
 115 StringRef CXXUuidofExpr::getUuidAsStringRef(ASTContext &Context) const {
 116   StringRef Uuid;
 117   if (isTypeOperand())
 118     Uuid = CXXUuidofExpr::GetUuidAttrOfType(getTypeOperand(Context))->getGuid();
 119   else {
 120     // Special case: __uuidof(0) means an all-zero GUID.
 121     Expr *Op = getExprOperand();
 122     if (!Op->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
 123       Uuid = CXXUuidofExpr::GetUuidAttrOfType(Op->getType())->getGuid();
 124     else
 125       Uuid = "00000000-0000-0000-0000-000000000000";
 126   }
 127   return Uuid;
 128 }
 129
 130 // CXXScalarValueInitExpr
 131 SourceLocation CXXScalarValueInitExpr::getLocStart() const {
 132   return TypeInfo ? TypeInfo->getTypeLoc().getBeginLoc() : RParenLoc;
 133 }
 134
 135 // CXXNewExpr
 136 CXXNewExpr::CXXNewExpr(const ASTContext &C, bool globalNew,
 137                        FunctionDecl *operatorNew, FunctionDecl *operatorDelete,
 138                        bool usualArrayDeleteWantsSize,
 139                        ArrayRef<Expr*> placementArgs,
 140                        SourceRange typeIdParens, Expr *arraySize,
 141                        InitializationStyle initializationStyle,
 142                        Expr *initializer, QualType ty,
 143                        TypeSourceInfo *allocatedTypeInfo,
 144                        SourceRange Range, SourceRange directInitRange)
 145   : Expr(CXXNewExprClass, ty, VK_RValue, OK_Ordinary,
 146          ty->isDependentType(), ty->isDependentType(),
 147          ty->isInstantiationDependentType(),
 148          ty->containsUnexpandedParameterPack()),
 149     SubExprs(nullptr), OperatorNew(operatorNew), OperatorDelete(operatorDelete),
 150     AllocatedTypeInfo(allocatedTypeInfo), TypeIdParens(typeIdParens),
 151     Range(Range), DirectInitRange(directInitRange),
 152     GlobalNew(globalNew), UsualArrayDeleteWantsSize(usualArrayDeleteWantsSize) {
 153   assert((initializer != nullptr || initializationStyle == NoInit) &&
 154          "Only NoInit can have no initializer.");
 155   StoredInitializationStyle = initializer ? initializationStyle + 1 : 0;
 156   AllocateArgsArray(C, arraySize != nullptr, placementArgs.size(),
 157                     initializer != nullptr);
 158   unsigned i = 0;
 159   if (Array) {
 160     if (arraySize->isInstantiationDependent())
 161       ExprBits.InstantiationDependent = true;
 162
 163     if (arraySize->containsUnexpandedParameterPack())
 164       ExprBits.ContainsUnexpandedParameterPack = true;
 165
 166     SubExprs[i++] = arraySize;
 167   }
 168
 169   if (initializer) {
 170     if (initializer->isInstantiationDependent())
 171       ExprBits.InstantiationDependent = true;
 172
 173     if (initializer->containsUnexpandedParameterPack())
 174       ExprBits.ContainsUnexpandedParameterPack = true;
 175
 176     SubExprs[i++] = initializer;
 177   }
 178
 179   for (unsigned j = 0; j != placementArgs.size(); ++j) {
 180     if (placementArgs[j]->isInstantiationDependent())
 181       ExprBits.InstantiationDependent = true;
 182     if (placementArgs[j]->containsUnexpandedParameterPack())
 183       ExprBits.ContainsUnexpandedParameterPack = true;
 184
 185     SubExprs[i++] = placementArgs[j];
 186   }
 187
 188   switch (getInitializationStyle()) {
 189   case CallInit:
 190     this->Range.setEnd(DirectInitRange.getEnd()); break;
 191   case ListInit:
 192     this->Range.setEnd(getInitializer()->getSourceRange().getEnd()); break;
 193   default:
 194     if (TypeIdParens.isValid())
 195       this->Range.setEnd(TypeIdParens.getEnd());
 196     break;
 197   }
 198 }
 199
 200 void CXXNewExpr::AllocateArgsArray(const ASTContext &C, bool isArray,
 201                                    unsigned numPlaceArgs, bool hasInitializer){
 202   assert(SubExprs == nullptr && "SubExprs already allocated");
 203   Array = isArray;
 204   NumPlacementArgs = numPlaceArgs;
 205
 206   unsigned TotalSize = Array + hasInitializer + NumPlacementArgs;
 207   SubExprs = new (C) Stmt*[TotalSize];
 208 }
 209
 210 bool CXXNewExpr::shouldNullCheckAllocation(const ASTContext &Ctx) const {
 211   return getOperatorNew()->getType()->castAs<FunctionProtoType>()->isNothrow(
 212              Ctx) &&
 213          !getOperatorNew()->isReservedGlobalPlacementOperator();
 214 }
 215
 216 // CXXDeleteExpr
 217 QualType CXXDeleteExpr::getDestroyedType() const {
 218   const Expr *Arg = getArgument();
 219   // The type-to-delete may not be a pointer if it's a dependent type.
 220   const QualType ArgType = Arg->getType();
 221
 222   if (ArgType->isDependentType() && !ArgType->isPointerType())
 223     return QualType();
 224
 225   return ArgType->getAs<PointerType>()->getPointeeType();
 226 }
 227
 228 // CXXPseudoDestructorExpr
 229 PseudoDestructorTypeStorage::PseudoDestructorTypeStorage(TypeSourceInfo *Info)
 230  : Type(Info)
 231 {
 232   Location = Info->getTypeLoc().getLocalSourceRange().getBegin();
 233 }
 234
 235 CXXPseudoDestructorExpr::CXXPseudoDestructorExpr(const ASTContext &Context,
 236                 Expr *Base, bool isArrow, SourceLocation OperatorLoc,
 237                 NestedNameSpecifierLoc QualifierLoc, TypeSourceInfo *ScopeType,
 238                 SourceLocation ColonColonLoc, SourceLocation TildeLoc,
 239                 PseudoDestructorTypeStorage DestroyedType)
 240   : Expr(CXXPseudoDestructorExprClass,
 241          Context.BoundMemberTy,
 242          VK_RValue, OK_Ordinary,
 243          /*isTypeDependent=*/(Base->isTypeDependent() ||
 244            (DestroyedType.getTypeSourceInfo() &&
 245             DestroyedType.getTypeSourceInfo()->getType()->isDependentType())),
 246          /*isValueDependent=*/Base->isValueDependent(),
 247          (Base->isInstantiationDependent() ||
 248           (QualifierLoc &&
 249            QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent()) ||
 250           (ScopeType &&
 251            ScopeType->getType()->isInstantiationDependentType()) ||
 252           (DestroyedType.getTypeSourceInfo() &&
 253            DestroyedType.getTypeSourceInfo()->getType()
 254                                              ->isInstantiationDependentType())),
 255          // ContainsUnexpandedParameterPack
 256          (Base->containsUnexpandedParameterPack() ||
 257           (QualifierLoc &&
 258            QualifierLoc.getNestedNameSpecifier()
 259                                         ->containsUnexpandedParameterPack()) ||
 260           (ScopeType &&
 261            ScopeType->getType()->containsUnexpandedParameterPack()) ||
 262           (DestroyedType.getTypeSourceInfo() &&
 263            DestroyedType.getTypeSourceInfo()->getType()
 264                                    ->containsUnexpandedParameterPack()))),
 265     Base(static_cast<Stmt *>(Base)), IsArrow(isArrow),
 266     OperatorLoc(OperatorLoc), QualifierLoc(QualifierLoc),
 267     ScopeType(ScopeType), ColonColonLoc(ColonColonLoc), TildeLoc(TildeLoc),
 268     DestroyedType(DestroyedType) { }
 269
 270 QualType CXXPseudoDestructorExpr::getDestroyedType() const {
 271   if (TypeSourceInfo *TInfo = DestroyedType.getTypeSourceInfo())
 272     return TInfo->getType();
 273
 274   return QualType();
 275 }
 276
 277 SourceLocation CXXPseudoDestructorExpr::getLocEnd() const {
 278   SourceLocation End = DestroyedType.getLocation();
 279   if (TypeSourceInfo *TInfo = DestroyedType.getTypeSourceInfo())
 280     End = TInfo->getTypeLoc().getLocalSourceRange().getEnd();
 281   return End;
 282 }
 283
 284 // UnresolvedLookupExpr
 285 UnresolvedLookupExpr *
 286 UnresolvedLookupExpr::Create(const ASTContext &C,
 287                              CXXRecordDecl *NamingClass,
 288                              NestedNameSpecifierLoc QualifierLoc,
 289                              SourceLocation TemplateKWLoc,
 290                              const DeclarationNameInfo &NameInfo,
 291                              bool ADL,
 292                              const TemplateArgumentListInfo *Args,
 293                              UnresolvedSetIterator Begin,
 294                              UnresolvedSetIterator End)
 295 {
 296   assert(Args || TemplateKWLoc.isValid());
 297   unsigned num_args = Args ? Args->size() : 0;
 298
 299   std::size_t Size =
 300       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(1,
 301                                                                       num_args);
 302   void *Mem = C.Allocate(Size, llvm::alignOf<UnresolvedLookupExpr>());
 303   return new (Mem) UnresolvedLookupExpr(C, NamingClass, QualifierLoc,
 304                                         TemplateKWLoc, NameInfo,
 305                                         ADL, /*Overload*/ true, Args,
 306                                         Begin, End);
 307 }
 308
 309 UnresolvedLookupExpr *
 310 UnresolvedLookupExpr::CreateEmpty(const ASTContext &C,
 311                                   bool HasTemplateKWAndArgsInfo,
 312                                   unsigned NumTemplateArgs) {
 313   assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
 314   std::size_t Size =
 315       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
 316           HasTemplateKWAndArgsInfo, NumTemplateArgs);
 317   void *Mem = C.Allocate(Size, llvm::alignOf<UnresolvedLookupExpr>());
 318   UnresolvedLookupExpr *E = new (Mem) UnresolvedLookupExpr(EmptyShell());
 319   E->HasTemplateKWAndArgsInfo = HasTemplateKWAndArgsInfo;
 320   return E;
 321 }
 322
 323 OverloadExpr::OverloadExpr(StmtClass K, const ASTContext &C,
 324                            NestedNameSpecifierLoc QualifierLoc,
 325                            SourceLocation TemplateKWLoc,
 326                            const DeclarationNameInfo &NameInfo,
 327                            const TemplateArgumentListInfo *TemplateArgs,
 328                            UnresolvedSetIterator Begin,
 329                            UnresolvedSetIterator End,
 330                            bool KnownDependent,
 331                            bool KnownInstantiationDependent,
 332                            bool KnownContainsUnexpandedParameterPack)
 333   : Expr(K, C.OverloadTy, VK_LValue, OK_Ordinary, KnownDependent,
 334          KnownDependent,
 335          (KnownInstantiationDependent ||
 336           NameInfo.isInstantiationDependent() ||
 337           (QualifierLoc &&
 338            QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent())),
 339          (KnownContainsUnexpandedParameterPack ||
 340           NameInfo.containsUnexpandedParameterPack() ||
 341           (QualifierLoc &&
 342            QualifierLoc.getNestedNameSpecifier()
 343                                       ->containsUnexpandedParameterPack()))),
 344     NameInfo(NameInfo), QualifierLoc(QualifierLoc),
 345     Results(nullptr), NumResults(End - Begin),
 346     HasTemplateKWAndArgsInfo(TemplateArgs != nullptr ||
 347                              TemplateKWLoc.isValid()) {
 348   NumResults = End - Begin;
 349   if (NumResults) {
 350     // Determine whether this expression is type-dependent.
 351     for (UnresolvedSetImpl::const_iterator I = Begin; I != End; ++I) {
 352       if ((*I)->getDeclContext()->isDependentContext() ||
 353           isa<UnresolvedUsingValueDecl>(*I)) {
 354         ExprBits.TypeDependent = true;
 355         ExprBits.ValueDependent = true;
 356         ExprBits.InstantiationDependent = true;
 357       }
 358     }
 359
 360     Results = static_cast<DeclAccessPair *>(
 361                                 C.Allocate(sizeof(DeclAccessPair) * NumResults,
 362                                            llvm::alignOf<DeclAccessPair>()));
 363     memcpy(Results, Begin.I, NumResults * sizeof(DeclAccessPair));
 364   }
 365
 366   // If we have explicit template arguments, check for dependent
 367   // template arguments and whether they contain any unexpanded pack
 368   // expansions.
 369   if (TemplateArgs) {
 370     bool Dependent = false;
 371     bool InstantiationDependent = false;
 372     bool ContainsUnexpandedParameterPack = false;
 373     getTrailingASTTemplateKWAndArgsInfo()->initializeFrom(
 374         TemplateKWLoc, *TemplateArgs, getTrailingTemplateArgumentLoc(),
 375         Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
 376
 377     if (Dependent) {
 378       ExprBits.TypeDependent = true;
 379       ExprBits.ValueDependent = true;
 380     }
 381     if (InstantiationDependent)
 382       ExprBits.InstantiationDependent = true;
 383     if (ContainsUnexpandedParameterPack)
 384       ExprBits.ContainsUnexpandedParameterPack = true;
 385   } else if (TemplateKWLoc.isValid()) {
 386     getTrailingASTTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc);
 387   }
 388
 389   if (isTypeDependent())
 390     setType(C.DependentTy);
 391 }
 392
 393 void OverloadExpr::initializeResults(const ASTContext &C,
 394                                      UnresolvedSetIterator Begin,
 395                                      UnresolvedSetIterator End) {
 396   assert(!Results && "Results already initialized!");
 397   NumResults = End - Begin;
 398   if (NumResults) {
 399      Results = static_cast<DeclAccessPair *>(
 400                                C.Allocate(sizeof(DeclAccessPair) * NumResults,
 401
 402                                           llvm::alignOf<DeclAccessPair>()));
 403      memcpy(Results, Begin.I, NumResults * sizeof(DeclAccessPair));
 404   }
 405 }
 406
 407 CXXRecordDecl *OverloadExpr::getNamingClass() const {
 408   if (isa<UnresolvedLookupExpr>(this))
 409     return cast<UnresolvedLookupExpr>(this)->getNamingClass();
 410   else
 411     return cast<UnresolvedMemberExpr>(this)->getNamingClass();
 412 }
 413
 414 // DependentScopeDeclRefExpr
 415 DependentScopeDeclRefExpr::DependentScopeDeclRefExpr(QualType T,
 416                             NestedNameSpecifierLoc QualifierLoc,
 417                             SourceLocation TemplateKWLoc,
 418                             const DeclarationNameInfo &NameInfo,
 419                             const TemplateArgumentListInfo *Args)
 420   : Expr(DependentScopeDeclRefExprClass, T, VK_LValue, OK_Ordinary,
 421          true, true,
 422          (NameInfo.isInstantiationDependent() ||
 423           (QualifierLoc &&
 424            QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent())),
 425          (NameInfo.containsUnexpandedParameterPack() ||
 426           (QualifierLoc &&
 427            QualifierLoc.getNestedNameSpecifier()
 428                             ->containsUnexpandedParameterPack()))),
 429     QualifierLoc(QualifierLoc), NameInfo(NameInfo),
 430     HasTemplateKWAndArgsInfo(Args != nullptr || TemplateKWLoc.isValid())
 431 {
 432   if (Args) {
 433     bool Dependent = true;
 434     bool InstantiationDependent = true;
 435     bool ContainsUnexpandedParameterPack
 436       = ExprBits.ContainsUnexpandedParameterPack;
 437     getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
 438         TemplateKWLoc, *Args, getTrailingObjects<TemplateArgumentLoc>(),
 439         Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
 440     ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack;
 441   } else if (TemplateKWLoc.isValid()) {
 442     getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
 443         TemplateKWLoc);
 444   }
 445 }
 446
 447 DependentScopeDeclRefExpr *
 448 DependentScopeDeclRefExpr::Create(const ASTContext &C,
 449                                   NestedNameSpecifierLoc QualifierLoc,
 450                                   SourceLocation TemplateKWLoc,
 451                                   const DeclarationNameInfo &NameInfo,
 452                                   const TemplateArgumentListInfo *Args) {
 453   assert(QualifierLoc && "should be created for dependent qualifiers");
 454   bool HasTemplateKWAndArgsInfo = Args || TemplateKWLoc.isValid();
 455   std::size_t Size =
 456       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
 457           HasTemplateKWAndArgsInfo, Args ? Args->size() : 0);
 458   void *Mem = C.Allocate(Size);
 459   return new (Mem) DependentScopeDeclRefExpr(C.DependentTy, QualifierLoc,
 460                                              TemplateKWLoc, NameInfo, Args);
 461 }
 462
 463 DependentScopeDeclRefExpr *
 464 DependentScopeDeclRefExpr::CreateEmpty(const ASTContext &C,
 465                                        bool HasTemplateKWAndArgsInfo,
 466                                        unsigned NumTemplateArgs) {
 467   assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
 468   std::size_t Size =
 469       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
 470           HasTemplateKWAndArgsInfo, NumTemplateArgs);
 471   void *Mem = C.Allocate(Size);
 472   DependentScopeDeclRefExpr *E
 473     = new (Mem) DependentScopeDeclRefExpr(QualType(), NestedNameSpecifierLoc(),
 474                                           SourceLocation(),
 475                                           DeclarationNameInfo(), nullptr);
 476   E->HasTemplateKWAndArgsInfo = HasTemplateKWAndArgsInfo;
 477   return E;
 478 }
 479
 480 SourceLocation CXXConstructExpr::getLocStart() const {
 481   if (isa<CXXTemporaryObjectExpr>(this))
 482     return cast<CXXTemporaryObjectExpr>(this)->getLocStart();
 483   return Loc;
 484 }
 485
 486 SourceLocation CXXConstructExpr::getLocEnd() const {
 487   if (isa<CXXTemporaryObjectExpr>(this))
 488     return cast<CXXTemporaryObjectExpr>(this)->getLocEnd();
 489
 490   if (ParenOrBraceRange.isValid())
 491     return ParenOrBraceRange.getEnd();
 492
 493   SourceLocation End = Loc;
 494   for (unsigned I = getNumArgs(); I > 0; --I) {
 495     const Expr *Arg = getArg(I-1);
 496     if (!Arg->isDefaultArgument()) {
 497       SourceLocation NewEnd = Arg->getLocEnd();
 498       if (NewEnd.isValid()) {
 499         End = NewEnd;
 500         break;
 501       }
 502     }
 503   }
 504
 505   return End;
 506 }
 507
 508 SourceRange CXXOperatorCallExpr::getSourceRangeImpl() const {
 509   OverloadedOperatorKind Kind = getOperator();
 510   if (Kind == OO_PlusPlus || Kind == OO_MinusMinus) {
 511     if (getNumArgs() == 1)
 512       // Prefix operator
 513       return SourceRange(getOperatorLoc(), getArg(0)->getLocEnd());
 514     else
 515       // Postfix operator
 516       return SourceRange(getArg(0)->getLocStart(), getOperatorLoc());
 517   } else if (Kind == OO_Arrow) {
 518     return getArg(0)->getSourceRange();
 519   } else if (Kind == OO_Call) {
 520     return SourceRange(getArg(0)->getLocStart(), getRParenLoc());
 521   } else if (Kind == OO_Subscript) {
 522     return SourceRange(getArg(0)->getLocStart(), getRParenLoc());
 523   } else if (getNumArgs() == 1) {
 524     return SourceRange(getOperatorLoc(), getArg(0)->getLocEnd());
 525   } else if (getNumArgs() == 2) {
 526     return SourceRange(getArg(0)->getLocStart(), getArg(1)->getLocEnd());
 527   } else {
 528     return getOperatorLoc();
 529   }
 530 }
 531
 532 Expr *CXXMemberCallExpr::getImplicitObjectArgument() const {
 533   const Expr *Callee = getCallee()->IgnoreParens();
 534   if (const MemberExpr *MemExpr = dyn_cast<MemberExpr>(Callee))
 535     return MemExpr->getBase();
 536   if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(Callee))
 537     if (BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI)
 538       return BO->getLHS();
 539
 540   // FIXME: Will eventually need to cope with member pointers.
 541   return nullptr;
 542 }
 543
 544 CXXMethodDecl *CXXMemberCallExpr::getMethodDecl() const {
 545   if (const MemberExpr *MemExpr =
 546       dyn_cast<MemberExpr>(getCallee()->IgnoreParens()))
 547     return cast<CXXMethodDecl>(MemExpr->getMemberDecl());
 548
 549   // FIXME: Will eventually need to cope with member pointers.
 550   return nullptr;
 551 }
 552
 553
 554 CXXRecordDecl *CXXMemberCallExpr::getRecordDecl() const {
 555   Expr* ThisArg = getImplicitObjectArgument();
 556   if (!ThisArg)
 557     return nullptr;
 558
 559   if (ThisArg->getType()->isAnyPointerType())
 560     return ThisArg->getType()->getPointeeType()->getAsCXXRecordDecl();
 561
 562   return ThisArg->getType()->getAsCXXRecordDecl();
 563 }
 564
 565
 566 //===----------------------------------------------------------------------===//
 567 //  Named casts
 568 //===----------------------------------------------------------------------===//
 569
 570 /// getCastName - Get the name of the C++ cast being used, e.g.,
 571 /// "static_cast", "dynamic_cast", "reinterpret_cast", or
 572 /// "const_cast". The returned pointer must not be freed.
 573 const char *CXXNamedCastExpr::getCastName() const {
 574   switch (getStmtClass()) {
 575   case CXXStaticCastExprClass:      return "static_cast";
 576   case CXXDynamicCastExprClass:     return "dynamic_cast";
 577   case CXXReinterpretCastExprClass: return "reinterpret_cast";
 578   case CXXConstCastExprClass:       return "const_cast";
 579   default:                          return "<invalid cast>";
 580   }
 581 }
 582
 583 CXXStaticCastExpr *CXXStaticCastExpr::Create(const ASTContext &C, QualType T,
 584                                              ExprValueKind VK,
 585                                              CastKind K, Expr *Op,
 586                                              const CXXCastPath *BasePath,
 587                                              TypeSourceInfo *WrittenTy,
 588                                              SourceLocation L,
 589                                              SourceLocation RParenLoc,
 590                                              SourceRange AngleBrackets) {
 591   unsigned PathSize = (BasePath ? BasePath->size() : 0);
 592   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
 593   CXXStaticCastExpr *E =
 594     new (Buffer) CXXStaticCastExpr(T, VK, K, Op, PathSize, WrittenTy, L,
 595                                    RParenLoc, AngleBrackets);
 596   if (PathSize)
 597     std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
 598                               E->getTrailingObjects<CXXBaseSpecifier *>());
 599   return E;
 600 }
 601
 602 CXXStaticCastExpr *CXXStaticCastExpr::CreateEmpty(const ASTContext &C,
 603                                                   unsigned PathSize) {
 604   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
 605   return new (Buffer) CXXStaticCastExpr(EmptyShell(), PathSize);
 606 }
 607
 608 CXXDynamicCastExpr *CXXDynamicCastExpr::Create(const ASTContext &C, QualType T,
 609                                                ExprValueKind VK,
 610                                                CastKind K, Expr *Op,
 611                                                const CXXCastPath *BasePath,
 612                                                TypeSourceInfo *WrittenTy,
 613                                                SourceLocation L,
 614                                                SourceLocation RParenLoc,
 615                                                SourceRange AngleBrackets) {
 616   unsigned PathSize = (BasePath ? BasePath->size() : 0);
 617   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
 618   CXXDynamicCastExpr *E =
 619     new (Buffer) CXXDynamicCastExpr(T, VK, K, Op, PathSize, WrittenTy, L,
 620                                     RParenLoc, AngleBrackets);
 621   if (PathSize)
 622     std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
 623                               E->getTrailingObjects<CXXBaseSpecifier *>());
 624   return E;
 625 }
 626
 627 CXXDynamicCastExpr *CXXDynamicCastExpr::CreateEmpty(const ASTContext &C,
 628                                                     unsigned PathSize) {
 629   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
 630   return new (Buffer) CXXDynamicCastExpr(EmptyShell(), PathSize);
 631 }
 632
 633 /// isAlwaysNull - Return whether the result of the dynamic_cast is proven
 634 /// to always be null. For example:
 635 ///
 636 /// struct A { };
 637 /// struct B final : A { };
 638 /// struct C { };
 639 ///
 640 /// C *f(B* b) { return dynamic_cast<C*>(b); }
 641 bool CXXDynamicCastExpr::isAlwaysNull() const
 642 {
 643   QualType SrcType = getSubExpr()->getType();
 644   QualType DestType = getType();
 645
 646   if (const PointerType *SrcPTy = SrcType->getAs<PointerType>()) {
 647     SrcType = SrcPTy->getPointeeType();
 648     DestType = DestType->castAs<PointerType>()->getPointeeType();
 649   }
 650
 651   if (DestType->isVoidType())
 652     return false;
 653
 654   const CXXRecordDecl *SrcRD =
 655     cast<CXXRecordDecl>(SrcType->castAs<RecordType>()->getDecl());
 656
 657   if (!SrcRD->hasAttr<FinalAttr>())
 658     return false;
 659
 660   const CXXRecordDecl *DestRD =
 661     cast<CXXRecordDecl>(DestType->castAs<RecordType>()->getDecl());
 662
 663   return !DestRD->isDerivedFrom(SrcRD);
 664 }
 665
 666 CXXReinterpretCastExpr *
 667 CXXReinterpretCastExpr::Create(const ASTContext &C, QualType T,
 668                                ExprValueKind VK, CastKind K, Expr *Op,
 669                                const CXXCastPath *BasePath,
 670                                TypeSourceInfo *WrittenTy, SourceLocation L,
 671                                SourceLocation RParenLoc,
 672                                SourceRange AngleBrackets) {
 673   unsigned PathSize = (BasePath ? BasePath->size() : 0);
 674   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
 675   CXXReinterpretCastExpr *E =
 676     new (Buffer) CXXReinterpretCastExpr(T, VK, K, Op, PathSize, WrittenTy, L,
 677                                         RParenLoc, AngleBrackets);
 678   if (PathSize)
 679     std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
 680                               E->getTrailingObjects<CXXBaseSpecifier *>());
 681   return E;
 682 }
 683
 684 CXXReinterpretCastExpr *
 685 CXXReinterpretCastExpr::CreateEmpty(const ASTContext &C, unsigned PathSize) {
 686   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
 687   return new (Buffer) CXXReinterpretCastExpr(EmptyShell(), PathSize);
 688 }
 689
 690 CXXConstCastExpr *CXXConstCastExpr::Create(const ASTContext &C, QualType T,
 691                                            ExprValueKind VK, Expr *Op,
 692                                            TypeSourceInfo *WrittenTy,
 693                                            SourceLocation L,
 694                                            SourceLocation RParenLoc,
 695                                            SourceRange AngleBrackets) {
 696   return new (C) CXXConstCastExpr(T, VK, Op, WrittenTy, L, RParenLoc, AngleBrackets);
 697 }
 698
 699 CXXConstCastExpr *CXXConstCastExpr::CreateEmpty(const ASTContext &C) {
 700   return new (C) CXXConstCastExpr(EmptyShell());
 701 }
 702
 703 CXXFunctionalCastExpr *
 704 CXXFunctionalCastExpr::Create(const ASTContext &C, QualType T, ExprValueKind VK,
 705                               TypeSourceInfo *Written, CastKind K, Expr *Op,
 706                               const CXXCastPath *BasePath,
 707                               SourceLocation L, SourceLocation R) {
 708   unsigned PathSize = (BasePath ? BasePath->size() : 0);
 709   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
 710   CXXFunctionalCastExpr *E =
 711     new (Buffer) CXXFunctionalCastExpr(T, VK, Written, K, Op, PathSize, L, R);
 712   if (PathSize)
 713     std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
 714                               E->getTrailingObjects<CXXBaseSpecifier *>());
 715   return E;
 716 }
 717
 718 CXXFunctionalCastExpr *
 719 CXXFunctionalCastExpr::CreateEmpty(const ASTContext &C, unsigned PathSize) {
 720   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
 721   return new (Buffer) CXXFunctionalCastExpr(EmptyShell(), PathSize);
 722 }
 723
 724 SourceLocation CXXFunctionalCastExpr::getLocStart() const {
 725   return getTypeInfoAsWritten()->getTypeLoc().getLocStart();
 726 }
 727
 728 SourceLocation CXXFunctionalCastExpr::getLocEnd() const {
 729   return RParenLoc.isValid() ? RParenLoc : getSubExpr()->getLocEnd();
 730 }
 731
 732 UserDefinedLiteral::LiteralOperatorKind
 733 UserDefinedLiteral::getLiteralOperatorKind() const {
 734   if (getNumArgs() == 0)
 735     return LOK_Template;
 736   if (getNumArgs() == 2)
 737     return LOK_String;
 738
 739   assert(getNumArgs() == 1 && "unexpected #args in literal operator call");
 740   QualType ParamTy =
 741     cast<FunctionDecl>(getCalleeDecl())->getParamDecl(0)->getType();
 742   if (ParamTy->isPointerType())
 743     return LOK_Raw;
 744   if (ParamTy->isAnyCharacterType())
 745     return LOK_Character;
 746   if (ParamTy->isIntegerType())
 747     return LOK_Integer;
 748   if (ParamTy->isFloatingType())
 749     return LOK_Floating;
 750
 751   llvm_unreachable("unknown kind of literal operator");
 752 }
 753
 754 Expr *UserDefinedLiteral::getCookedLiteral() {
 755 #ifndef NDEBUG
 756   LiteralOperatorKind LOK = getLiteralOperatorKind();
 757   assert(LOK != LOK_Template && LOK != LOK_Raw && "not a cooked literal");
 758 #endif
 759   return getArg(0);
 760 }
 761
 762 const IdentifierInfo *UserDefinedLiteral::getUDSuffix() const {
 763   return cast<FunctionDecl>(getCalleeDecl())->getLiteralIdentifier();
 764 }
 765
 766 CXXDefaultInitExpr::CXXDefaultInitExpr(const ASTContext &C, SourceLocation Loc,
 767                                        FieldDecl *Field, QualType T)
 768     : Expr(CXXDefaultInitExprClass, T.getNonLValueExprType(C),
 769            T->isLValueReferenceType() ? VK_LValue : T->isRValueReferenceType()
 770                                                         ? VK_XValue
 771                                                         : VK_RValue,
 772            /*FIXME*/ OK_Ordinary, false, false, false, false),
 773       Field(Field), Loc(Loc) {
 774   assert(Field->hasInClassInitializer());
 775 }
 776
 777 CXXTemporary *CXXTemporary::Create(const ASTContext &C,
 778                                    const CXXDestructorDecl *Destructor) {
 779   return new (C) CXXTemporary(Destructor);
 780 }
 781
 782 CXXBindTemporaryExpr *CXXBindTemporaryExpr::Create(const ASTContext &C,
 783                                                    CXXTemporary *Temp,
 784                                                    Expr* SubExpr) {
 785   assert((SubExpr->getType()->isRecordType() ||
 786           SubExpr->getType()->isArrayType()) &&
 787          "Expression bound to a temporary must have record or array type!");
 788
 789   return new (C) CXXBindTemporaryExpr(Temp, SubExpr);
 790 }
 791
 792 CXXTemporaryObjectExpr::CXXTemporaryObjectExpr(const ASTContext &C,
 793                                                CXXConstructorDecl *Cons,
 794                                                TypeSourceInfo *Type,
 795                                                ArrayRef<Expr*> Args,
 796                                                SourceRange ParenOrBraceRange,
 797                                                bool HadMultipleCandidates,
 798                                                bool ListInitialization,
 799                                                bool StdInitListInitialization,
 800                                                bool ZeroInitialization)
 801   : CXXConstructExpr(C, CXXTemporaryObjectExprClass,
 802                      Type->getType().getNonReferenceType(),
 803                      Type->getTypeLoc().getBeginLoc(),
 804                      Cons, false, Args,
 805                      HadMultipleCandidates,
 806                      ListInitialization,
 807                      StdInitListInitialization,
 808                      ZeroInitialization,
 809                      CXXConstructExpr::CK_Complete, ParenOrBraceRange),
 810     Type(Type) {
 811 }
 812
 813 SourceLocation CXXTemporaryObjectExpr::getLocStart() const {
 814   return Type->getTypeLoc().getBeginLoc();
 815 }
 816
 817 SourceLocation CXXTemporaryObjectExpr::getLocEnd() const {
 818   SourceLocation Loc = getParenOrBraceRange().getEnd();
 819   if (Loc.isInvalid() && getNumArgs())
 820     Loc = getArg(getNumArgs()-1)->getLocEnd();
 821   return Loc;
 822 }
 823
 824 CXXConstructExpr *CXXConstructExpr::Create(const ASTContext &C, QualType T,
 825                                            SourceLocation Loc,
 826                                            CXXConstructorDecl *D, bool Elidable,
 827                                            ArrayRef<Expr*> Args,
 828                                            bool HadMultipleCandidates,
 829                                            bool ListInitialization,
 830                                            bool StdInitListInitialization,
 831                                            bool ZeroInitialization,
 832                                            ConstructionKind ConstructKind,
 833                                            SourceRange ParenOrBraceRange) {
 834   return new (C) CXXConstructExpr(C, CXXConstructExprClass, T, Loc, D,
 835                                   Elidable, Args,
 836                                   HadMultipleCandidates, ListInitialization,
 837                                   StdInitListInitialization,
 838                                   ZeroInitialization, ConstructKind,
 839                                   ParenOrBraceRange);
 840 }
 841
 842 CXXConstructExpr::CXXConstructExpr(const ASTContext &C, StmtClass SC,
 843                                    QualType T, SourceLocation Loc,
 844                                    CXXConstructorDecl *D, bool elidable,
 845                                    ArrayRef<Expr*> args,
 846                                    bool HadMultipleCandidates,
 847                                    bool ListInitialization,
 848                                    bool StdInitListInitialization,
 849                                    bool ZeroInitialization,
 850                                    ConstructionKind ConstructKind,
 851                                    SourceRange ParenOrBraceRange)
 852   : Expr(SC, T, VK_RValue, OK_Ordinary,
 853          T->isDependentType(), T->isDependentType(),
 854          T->isInstantiationDependentType(),
 855          T->containsUnexpandedParameterPack()),
 856     Constructor(D), Loc(Loc), ParenOrBraceRange(ParenOrBraceRange),
 857     NumArgs(args.size()),
 858     Elidable(elidable), HadMultipleCandidates(HadMultipleCandidates),
 859     ListInitialization(ListInitialization),
 860     StdInitListInitialization(StdInitListInitialization),
 861     ZeroInitialization(ZeroInitialization),
 862     ConstructKind(ConstructKind), Args(nullptr)
 863 {
 864   if (NumArgs) {
 865     Args = new (C) Stmt*[args.size()];
 866
 867     for (unsigned i = 0; i != args.size(); ++i) {
 868       assert(args[i] && "NULL argument in CXXConstructExpr");
 869
 870       if (args[i]->isValueDependent())
 871         ExprBits.ValueDependent = true;
 872       if (args[i]->isInstantiationDependent())
 873         ExprBits.InstantiationDependent = true;
 874       if (args[i]->containsUnexpandedParameterPack())
 875         ExprBits.ContainsUnexpandedParameterPack = true;
 876
 877       Args[i] = args[i];
 878     }
 879   }
 880 }
 881
 882 LambdaCapture::LambdaCapture(SourceLocation Loc, bool Implicit,
 883                              LambdaCaptureKind Kind, VarDecl *Var,
 884                              SourceLocation EllipsisLoc)
 885   : DeclAndBits(Var, 0), Loc(Loc), EllipsisLoc(EllipsisLoc)
 886 {
 887   unsigned Bits = 0;
 888   if (Implicit)
 889     Bits |= Capture_Implicit;
 890
 891   switch (Kind) {
 892   case LCK_This:
 893     assert(!Var && "'this' capture cannot have a variable!");
 894     break;
 895
 896   case LCK_ByCopy:
 897     Bits |= Capture_ByCopy;
 898     // Fall through
 899   case LCK_ByRef:
 900     assert(Var && "capture must have a variable!");
 901     break;
 902   case LCK_VLAType:
 903     assert(!Var && "VLA type capture cannot have a variable!");
 904     Bits |= Capture_ByCopy;
 905     break;
 906   }
 907   DeclAndBits.setInt(Bits);
 908 }
 909
 910 LambdaCaptureKind LambdaCapture::getCaptureKind() const {
 911   Decl *D = DeclAndBits.getPointer();
 912   bool CapByCopy = DeclAndBits.getInt() & Capture_ByCopy;
 913   if (!D)
 914     return CapByCopy ? LCK_VLAType : LCK_This;
 915
 916   return CapByCopy ? LCK_ByCopy : LCK_ByRef;
 917 }
 918
 919 LambdaExpr::LambdaExpr(QualType T, SourceRange IntroducerRange,
 920                        LambdaCaptureDefault CaptureDefault,
 921                        SourceLocation CaptureDefaultLoc,
 922                        ArrayRef<LambdaCapture> Captures, bool ExplicitParams,
 923                        bool ExplicitResultType, ArrayRef<Expr *> CaptureInits,
 924                        ArrayRef<VarDecl *> ArrayIndexVars,
 925                        ArrayRef<unsigned> ArrayIndexStarts,
 926                        SourceLocation ClosingBrace,
 927                        bool ContainsUnexpandedParameterPack)
 928     : Expr(LambdaExprClass, T, VK_RValue, OK_Ordinary, T->isDependentType(),
 929            T->isDependentType(), T->isDependentType(),
 930            ContainsUnexpandedParameterPack),
 931       IntroducerRange(IntroducerRange), CaptureDefaultLoc(CaptureDefaultLoc),
 932       NumCaptures(Captures.size()), CaptureDefault(CaptureDefault),
 933       ExplicitParams(ExplicitParams), ExplicitResultType(ExplicitResultType),
 934       ClosingBrace(ClosingBrace) {
 935   assert(CaptureInits.size() == Captures.size() && "Wrong number of arguments");
 936   CXXRecordDecl *Class = getLambdaClass();
 937   CXXRecordDecl::LambdaDefinitionData &Data = Class->getLambdaData();
 938
 939   // FIXME: Propagate "has unexpanded parameter pack" bit.
 940
 941   // Copy captures.
 942   const ASTContext &Context = Class->getASTContext();
 943   Data.NumCaptures = NumCaptures;
 944   Data.NumExplicitCaptures = 0;
 945   Data.Captures =
 946       (LambdaCapture *)Context.Allocate(sizeof(LambdaCapture) * NumCaptures);
 947   LambdaCapture *ToCapture = Data.Captures;
 948   for (unsigned I = 0, N = Captures.size(); I != N; ++I) {
 949     if (Captures[I].isExplicit())
 950       ++Data.NumExplicitCaptures;
 951
 952     *ToCapture++ = Captures[I];
 953   }
 954
 955   // Copy initialization expressions for the non-static data members.
 956   Stmt **Stored = getStoredStmts();
 957   for (unsigned I = 0, N = CaptureInits.size(); I != N; ++I)
 958     *Stored++ = CaptureInits[I];
 959
 960   // Copy the body of the lambda.
 961   *Stored++ = getCallOperator()->getBody();
 962
 963   // Copy the array index variables, if any.
 964   HasArrayIndexVars = !ArrayIndexVars.empty();
 965   if (HasArrayIndexVars) {
 966     assert(ArrayIndexStarts.size() == NumCaptures);
 967     memcpy(getArrayIndexVars(), ArrayIndexVars.data(),
 968            sizeof(VarDecl *) * ArrayIndexVars.size());
 969     memcpy(getArrayIndexStarts(), ArrayIndexStarts.data(),
 970            sizeof(unsigned) * Captures.size());
 971     getArrayIndexStarts()[Captures.size()] = ArrayIndexVars.size();
 972   }
 973 }
 974
 975 LambdaExpr *LambdaExpr::Create(
 976     const ASTContext &Context, CXXRecordDecl *Class,
 977     SourceRange IntroducerRange, LambdaCaptureDefault CaptureDefault,
 978     SourceLocation CaptureDefaultLoc, ArrayRef<LambdaCapture> Captures,
 979     bool ExplicitParams, bool ExplicitResultType, ArrayRef<Expr *> CaptureInits,
 980     ArrayRef<VarDecl *> ArrayIndexVars, ArrayRef<unsigned> ArrayIndexStarts,
 981     SourceLocation ClosingBrace, bool ContainsUnexpandedParameterPack) {
 982   // Determine the type of the expression (i.e., the type of the
 983   // function object we're creating).
 984   QualType T = Context.getTypeDeclType(Class);
 985
 986   unsigned Size = totalSizeToAlloc<Stmt *, unsigned, VarDecl *>(
 987       Captures.size() + 1, ArrayIndexVars.empty() ? 0 : Captures.size() + 1,
 988       ArrayIndexVars.size());
 989   void *Mem = Context.Allocate(Size);
 990   return new (Mem) LambdaExpr(T, IntroducerRange,
 991                               CaptureDefault, CaptureDefaultLoc, Captures,
 992                               ExplicitParams, ExplicitResultType,
 993                               CaptureInits, ArrayIndexVars, ArrayIndexStarts,
 994                               ClosingBrace, ContainsUnexpandedParameterPack);
 995 }
 996
 997 LambdaExpr *LambdaExpr::CreateDeserialized(const ASTContext &C,
 998                                            unsigned NumCaptures,
 999                                            unsigned NumArrayIndexVars) {
1000   unsigned Size = totalSizeToAlloc<Stmt *, unsigned, VarDecl *>(
1001       NumCaptures + 1, NumArrayIndexVars ? NumCaptures + 1 : 0,
1002       NumArrayIndexVars);
1003   void *Mem = C.Allocate(Size);
1004   return new (Mem) LambdaExpr(EmptyShell(), NumCaptures, NumArrayIndexVars > 0);
1005 }
1006
1007 bool LambdaExpr::isInitCapture(const LambdaCapture *C) const {
1008   return (C->capturesVariable() && C->getCapturedVar()->isInitCapture() &&
1009           (getCallOperator() == C->getCapturedVar()->getDeclContext()));
1010 }
1011
1012 LambdaExpr::capture_iterator LambdaExpr::capture_begin() const {
1013   return getLambdaClass()->getLambdaData().Captures;
1014 }
1015
1016 LambdaExpr::capture_iterator LambdaExpr::capture_end() const {
1017   return capture_begin() + NumCaptures;
1018 }
1019
1020 LambdaExpr::capture_range LambdaExpr::captures() const {
1021   return capture_range(capture_begin(), capture_end());
1022 }
1023
1024 LambdaExpr::capture_iterator LambdaExpr::explicit_capture_begin() const {
1025   return capture_begin();
1026 }
1027
1028 LambdaExpr::capture_iterator LambdaExpr::explicit_capture_end() const {
1029   struct CXXRecordDecl::LambdaDefinitionData &Data
1030     = getLambdaClass()->getLambdaData();
1031   return Data.Captures + Data.NumExplicitCaptures;
1032 }
1033
1034 LambdaExpr::capture_range LambdaExpr::explicit_captures() const {
1035   return capture_range(explicit_capture_begin(), explicit_capture_end());
1036 }
1037
1038 LambdaExpr::capture_iterator LambdaExpr::implicit_capture_begin() const {
1039   return explicit_capture_end();
1040 }
1041
1042 LambdaExpr::capture_iterator LambdaExpr::implicit_capture_end() const {
1043   return capture_end();
1044 }
1045
1046 LambdaExpr::capture_range LambdaExpr::implicit_captures() const {
1047   return capture_range(implicit_capture_begin(), implicit_capture_end());
1048 }
1049
1050 ArrayRef<VarDecl *>
1051 LambdaExpr::getCaptureInitIndexVars(const_capture_init_iterator Iter) const {
1052   assert(HasArrayIndexVars && "No array index-var data?");
1053
1054   unsigned Index = Iter - capture_init_begin();
1055   assert(Index < getLambdaClass()->getLambdaData().NumCaptures &&
1056          "Capture index out-of-range");
1057   VarDecl *const *IndexVars = getArrayIndexVars();
1058   const unsigned *IndexStarts = getArrayIndexStarts();
1059   return llvm::makeArrayRef(IndexVars + IndexStarts[Index],
1060                             IndexVars + IndexStarts[Index + 1]);
1061 }
1062
1063 CXXRecordDecl *LambdaExpr::getLambdaClass() const {
1064   return getType()->getAsCXXRecordDecl();
1065 }
1066
1067 CXXMethodDecl *LambdaExpr::getCallOperator() const {
1068   CXXRecordDecl *Record = getLambdaClass();
1069   return Record->getLambdaCallOperator();
1070 }
1071
1072 TemplateParameterList *LambdaExpr::getTemplateParameterList() const {
1073   CXXRecordDecl *Record = getLambdaClass();
1074   return Record->getGenericLambdaTemplateParameterList();
1075
1076 }
1077
1078 CompoundStmt *LambdaExpr::getBody() const {
1079   // FIXME: this mutation in getBody is bogus. It should be
1080   // initialized in ASTStmtReader::VisitLambdaExpr, but for reasons I
1081   // don't understand, that doesn't work.
1082   if (!getStoredStmts()[NumCaptures])
1083     *const_cast<clang::Stmt **>(&getStoredStmts()[NumCaptures]) =
1084         getCallOperator()->getBody();
1085
1086   return static_cast<CompoundStmt *>(getStoredStmts()[NumCaptures]);
1087 }
1088
1089 bool LambdaExpr::isMutable() const {
1090   return !getCallOperator()->isConst();
1091 }
1092
1093 ExprWithCleanups::ExprWithCleanups(Expr *subexpr,
1094                                    ArrayRef<CleanupObject> objects)
1095   : Expr(ExprWithCleanupsClass, subexpr->getType(),
1096          subexpr->getValueKind(), subexpr->getObjectKind(),
1097          subexpr->isTypeDependent(), subexpr->isValueDependent(),
1098          subexpr->isInstantiationDependent(),
1099          subexpr->containsUnexpandedParameterPack()),
1100     SubExpr(subexpr) {
1101   ExprWithCleanupsBits.NumObjects = objects.size();
1102   for (unsigned i = 0, e = objects.size(); i != e; ++i)
1103     getTrailingObjects<CleanupObject>()[i] = objects[i];
1104 }
1105
1106 ExprWithCleanups *ExprWithCleanups::Create(const ASTContext &C, Expr *subexpr,
1107                                            ArrayRef<CleanupObject> objects) {
1108   void *buffer = C.Allocate(totalSizeToAlloc<CleanupObject>(objects.size()),
1109                             llvm::alignOf<ExprWithCleanups>());
1110   return new (buffer) ExprWithCleanups(subexpr, objects);
1111 }
1112
1113 ExprWithCleanups::ExprWithCleanups(EmptyShell empty, unsigned numObjects)
1114   : Expr(ExprWithCleanupsClass, empty) {
1115   ExprWithCleanupsBits.NumObjects = numObjects;
1116 }
1117
1118 ExprWithCleanups *ExprWithCleanups::Create(const ASTContext &C,
1119                                            EmptyShell empty,
1120                                            unsigned numObjects) {
1121   void *buffer = C.Allocate(totalSizeToAlloc<CleanupObject>(numObjects),
1122                             llvm::alignOf<ExprWithCleanups>());
1123   return new (buffer) ExprWithCleanups(empty, numObjects);
1124 }
1125
1126 CXXUnresolvedConstructExpr::CXXUnresolvedConstructExpr(TypeSourceInfo *Type,
1127                                                  SourceLocation LParenLoc,
1128                                                  ArrayRef<Expr*> Args,
1129                                                  SourceLocation RParenLoc)
1130   : Expr(CXXUnresolvedConstructExprClass,
1131          Type->getType().getNonReferenceType(),
1132          (Type->getType()->isLValueReferenceType() ? VK_LValue
1133           :Type->getType()->isRValueReferenceType()? VK_XValue
1134           :VK_RValue),
1135          OK_Ordinary,
1136          Type->getType()->isDependentType(), true, true,
1137          Type->getType()->containsUnexpandedParameterPack()),
1138     Type(Type),
1139     LParenLoc(LParenLoc),
1140     RParenLoc(RParenLoc),
1141     NumArgs(Args.size()) {
1142   Expr **StoredArgs = getTrailingObjects<Expr *>();
1143   for (unsigned I = 0; I != Args.size(); ++I) {
1144     if (Args[I]->containsUnexpandedParameterPack())
1145       ExprBits.ContainsUnexpandedParameterPack = true;
1146
1147     StoredArgs[I] = Args[I];
1148   }
1149 }
1150
1151 CXXUnresolvedConstructExpr *
1152 CXXUnresolvedConstructExpr::Create(const ASTContext &C,
1153                                    TypeSourceInfo *Type,
1154                                    SourceLocation LParenLoc,
1155                                    ArrayRef<Expr*> Args,
1156                                    SourceLocation RParenLoc) {
1157   void *Mem = C.Allocate(totalSizeToAlloc<Expr *>(Args.size()));
1158   return new (Mem) CXXUnresolvedConstructExpr(Type, LParenLoc, Args, RParenLoc);
1159 }
1160
1161 CXXUnresolvedConstructExpr *
1162 CXXUnresolvedConstructExpr::CreateEmpty(const ASTContext &C, unsigned NumArgs) {
1163   Stmt::EmptyShell Empty;
1164   void *Mem = C.Allocate(totalSizeToAlloc<Expr *>(NumArgs));
1165   return new (Mem) CXXUnresolvedConstructExpr(Empty, NumArgs);
1166 }
1167
1168 SourceLocation CXXUnresolvedConstructExpr::getLocStart() const {
1169   return Type->getTypeLoc().getBeginLoc();
1170 }
1171
1172 CXXDependentScopeMemberExpr::CXXDependentScopeMemberExpr(
1173     const ASTContext &C, Expr *Base, QualType BaseType, bool IsArrow,
1174     SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc,
1175     SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierFoundInScope,
1176     DeclarationNameInfo MemberNameInfo,
1177     const TemplateArgumentListInfo *TemplateArgs)
1178     : Expr(CXXDependentScopeMemberExprClass, C.DependentTy, VK_LValue,
1179            OK_Ordinary, true, true, true,
1180            ((Base && Base->containsUnexpandedParameterPack()) ||
1181             (QualifierLoc &&
1182              QualifierLoc.getNestedNameSpecifier()
1183                  ->containsUnexpandedParameterPack()) ||
1184             MemberNameInfo.containsUnexpandedParameterPack())),
1185       Base(Base), BaseType(BaseType), IsArrow(IsArrow),
1186       HasTemplateKWAndArgsInfo(TemplateArgs != nullptr ||
1187                                TemplateKWLoc.isValid()),
1188       OperatorLoc(OperatorLoc), QualifierLoc(QualifierLoc),
1189       FirstQualifierFoundInScope(FirstQualifierFoundInScope),
1190       MemberNameInfo(MemberNameInfo) {
1191   if (TemplateArgs) {
1192     bool Dependent = true;
1193     bool InstantiationDependent = true;
1194     bool ContainsUnexpandedParameterPack = false;
1195     getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1196         TemplateKWLoc, *TemplateArgs, getTrailingObjects<TemplateArgumentLoc>(),
1197         Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
1198     if (ContainsUnexpandedParameterPack)
1199       ExprBits.ContainsUnexpandedParameterPack = true;
1200   } else if (TemplateKWLoc.isValid()) {
1201     getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1202         TemplateKWLoc);
1203   }
1204 }
1205
1206 CXXDependentScopeMemberExpr *
1207 CXXDependentScopeMemberExpr::Create(const ASTContext &C,
1208                                 Expr *Base, QualType BaseType, bool IsArrow,
1209                                 SourceLocation OperatorLoc,
1210                                 NestedNameSpecifierLoc QualifierLoc,
1211                                 SourceLocation TemplateKWLoc,
1212                                 NamedDecl *FirstQualifierFoundInScope,
1213                                 DeclarationNameInfo MemberNameInfo,
1214                                 const TemplateArgumentListInfo *TemplateArgs) {
1215   bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
1216   unsigned NumTemplateArgs = TemplateArgs ? TemplateArgs->size() : 0;
1217   std::size_t Size =
1218       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1219           HasTemplateKWAndArgsInfo, NumTemplateArgs);
1220
1221   void *Mem = C.Allocate(Size, llvm::alignOf<CXXDependentScopeMemberExpr>());
1222   return new (Mem) CXXDependentScopeMemberExpr(C, Base, BaseType,
1223                                                IsArrow, OperatorLoc,
1224                                                QualifierLoc,
1225                                                TemplateKWLoc,
1226                                                FirstQualifierFoundInScope,
1227                                                MemberNameInfo, TemplateArgs);
1228 }
1229
1230 CXXDependentScopeMemberExpr *
1231 CXXDependentScopeMemberExpr::CreateEmpty(const ASTContext &C,
1232                                          bool HasTemplateKWAndArgsInfo,
1233                                          unsigned NumTemplateArgs) {
1234   assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
1235   std::size_t Size =
1236       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1237           HasTemplateKWAndArgsInfo, NumTemplateArgs);
1238   void *Mem = C.Allocate(Size, llvm::alignOf<CXXDependentScopeMemberExpr>());
1239   CXXDependentScopeMemberExpr *E
1240     =  new (Mem) CXXDependentScopeMemberExpr(C, nullptr, QualType(),
1241                                              0, SourceLocation(),
1242                                              NestedNameSpecifierLoc(),
1243                                              SourceLocation(), nullptr,
1244                                              DeclarationNameInfo(), nullptr);
1245   E->HasTemplateKWAndArgsInfo = HasTemplateKWAndArgsInfo;
1246   return E;
1247 }
1248
1249 bool CXXDependentScopeMemberExpr::isImplicitAccess() const {
1250   if (!Base)
1251     return true;
1252
1253   return cast<Expr>(Base)->isImplicitCXXThis();
1254 }
1255
1256 static bool hasOnlyNonStaticMemberFunctions(UnresolvedSetIterator begin,
1257                                             UnresolvedSetIterator end) {
1258   do {
1259     NamedDecl *decl = *begin;
1260     if (isa<UnresolvedUsingValueDecl>(decl))
1261       return false;
1262
1263     // Unresolved member expressions should only contain methods and
1264     // method templates.
1265     if (cast<CXXMethodDecl>(decl->getUnderlyingDecl()->getAsFunction())
1266             ->isStatic())
1267       return false;
1268   } while (++begin != end);
1269
1270   return true;
1271 }
1272
1273 UnresolvedMemberExpr::UnresolvedMemberExpr(const ASTContext &C,
1274                                            bool HasUnresolvedUsing,
1275                                            Expr *Base, QualType BaseType,
1276                                            bool IsArrow,
1277                                            SourceLocation OperatorLoc,
1278                                            NestedNameSpecifierLoc QualifierLoc,
1279                                            SourceLocation TemplateKWLoc,
1280                                    const DeclarationNameInfo &MemberNameInfo,
1281                                    const TemplateArgumentListInfo *TemplateArgs,
1282                                            UnresolvedSetIterator Begin,
1283                                            UnresolvedSetIterator End)
1284   : OverloadExpr(UnresolvedMemberExprClass, C, QualifierLoc, TemplateKWLoc,
1285                  MemberNameInfo, TemplateArgs, Begin, End,
1286                  // Dependent
1287                  ((Base && Base->isTypeDependent()) ||
1288                   BaseType->isDependentType()),
1289                  ((Base && Base->isInstantiationDependent()) ||
1290                    BaseType->isInstantiationDependentType()),
1291                  // Contains unexpanded parameter pack
1292                  ((Base && Base->containsUnexpandedParameterPack()) ||
1293                   BaseType->containsUnexpandedParameterPack())),
1294     IsArrow(IsArrow), HasUnresolvedUsing(HasUnresolvedUsing),
1295     Base(Base), BaseType(BaseType), OperatorLoc(OperatorLoc) {
1296
1297   // Check whether all of the members are non-static member functions,
1298   // and if so, mark give this bound-member type instead of overload type.
1299   if (hasOnlyNonStaticMemberFunctions(Begin, End))
1300     setType(C.BoundMemberTy);
1301 }
1302
1303 bool UnresolvedMemberExpr::isImplicitAccess() const {
1304   if (!Base)
1305     return true;
1306
1307   return cast<Expr>(Base)->isImplicitCXXThis();
1308 }
1309
1310 UnresolvedMemberExpr *UnresolvedMemberExpr::Create(
1311     const ASTContext &C, bool HasUnresolvedUsing, Expr *Base, QualType BaseType,
1312     bool IsArrow, SourceLocation OperatorLoc,
1313     NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
1314     const DeclarationNameInfo &MemberNameInfo,
1315     const TemplateArgumentListInfo *TemplateArgs, UnresolvedSetIterator Begin,
1316     UnresolvedSetIterator End) {
1317   bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
1318   std::size_t Size =
1319       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1320           HasTemplateKWAndArgsInfo, TemplateArgs ? TemplateArgs->size() : 0);
1321
1322   void *Mem = C.Allocate(Size, llvm::alignOf<UnresolvedMemberExpr>());
1323   return new (Mem) UnresolvedMemberExpr(
1324       C, HasUnresolvedUsing, Base, BaseType, IsArrow, OperatorLoc, QualifierLoc,
1325       TemplateKWLoc, MemberNameInfo, TemplateArgs, Begin, End);
1326 }
1327
1328 UnresolvedMemberExpr *
1329 UnresolvedMemberExpr::CreateEmpty(const ASTContext &C,
1330                                   bool HasTemplateKWAndArgsInfo,
1331                                   unsigned NumTemplateArgs) {
1332   assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
1333   std::size_t Size =
1334       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1335           HasTemplateKWAndArgsInfo, NumTemplateArgs);
1336
1337   void *Mem = C.Allocate(Size, llvm::alignOf<UnresolvedMemberExpr>());
1338   UnresolvedMemberExpr *E = new (Mem) UnresolvedMemberExpr(EmptyShell());
1339   E->HasTemplateKWAndArgsInfo = HasTemplateKWAndArgsInfo;
1340   return E;
1341 }
1342
1343 CXXRecordDecl *UnresolvedMemberExpr::getNamingClass() const {
1344   // Unlike for UnresolvedLookupExpr, it is very easy to re-derive this.
1345
1346   // If there was a nested name specifier, it names the naming class.
1347   // It can't be dependent: after all, we were actually able to do the
1348   // lookup.
1349   CXXRecordDecl *Record = nullptr;
1350   auto *NNS = getQualifier();
1351   if (NNS && NNS->getKind() != NestedNameSpecifier::Super) {
1352     const Type *T = getQualifier()->getAsType();
1353     assert(T && "qualifier in member expression does not name type");
1354     Record = T->getAsCXXRecordDecl();
1355     assert(Record && "qualifier in member expression does not name record");
1356   }
1357   // Otherwise the naming class must have been the base class.
1358   else {
1359     QualType BaseType = getBaseType().getNonReferenceType();
1360     if (isArrow()) {
1361       const PointerType *PT = BaseType->getAs<PointerType>();
1362       assert(PT && "base of arrow member access is not pointer");
1363       BaseType = PT->getPointeeType();
1364     }
1365
1366     Record = BaseType->getAsCXXRecordDecl();
1367     assert(Record && "base of member expression does not name record");
1368   }
1369
1370   return Record;
1371 }
1372
1373 SizeOfPackExpr *
1374 SizeOfPackExpr::Create(ASTContext &Context, SourceLocation OperatorLoc,
1375                        NamedDecl *Pack, SourceLocation PackLoc,
1376                        SourceLocation RParenLoc,
1377                        Optional<unsigned> Length,
1378                        ArrayRef<TemplateArgument> PartialArgs) {
1379   void *Storage =
1380       Context.Allocate(totalSizeToAlloc<TemplateArgument>(PartialArgs.size()));
1381   return new (Storage) SizeOfPackExpr(Context.getSizeType(), OperatorLoc, Pack,
1382                                       PackLoc, RParenLoc, Length, PartialArgs);
1383 }
1384
1385 SizeOfPackExpr *SizeOfPackExpr::CreateDeserialized(ASTContext &Context,
1386                                                    unsigned NumPartialArgs) {
1387   void *Storage =
1388       Context.Allocate(totalSizeToAlloc<TemplateArgument>(NumPartialArgs));
1389   return new (Storage) SizeOfPackExpr(EmptyShell(), NumPartialArgs);
1390 }
1391
1392 SubstNonTypeTemplateParmPackExpr::
1393 SubstNonTypeTemplateParmPackExpr(QualType T,
1394                                  NonTypeTemplateParmDecl *Param,
1395                                  SourceLocation NameLoc,
1396                                  const TemplateArgument &ArgPack)
1397   : Expr(SubstNonTypeTemplateParmPackExprClass, T, VK_RValue, OK_Ordinary,
1398          true, true, true, true),
1399     Param(Param), Arguments(ArgPack.pack_begin()),
1400     NumArguments(ArgPack.pack_size()), NameLoc(NameLoc) { }
1401
1402 TemplateArgument SubstNonTypeTemplateParmPackExpr::getArgumentPack() const {
1403   return TemplateArgument(llvm::makeArrayRef(Arguments, NumArguments));
1404 }
1405
1406 FunctionParmPackExpr::FunctionParmPackExpr(QualType T, ParmVarDecl *ParamPack,
1407                                            SourceLocation NameLoc,
1408                                            unsigned NumParams,
1409                                            ParmVarDecl *const *Params)
1410     : Expr(FunctionParmPackExprClass, T, VK_LValue, OK_Ordinary, true, true,
1411            true, true),
1412       ParamPack(ParamPack), NameLoc(NameLoc), NumParameters(NumParams) {
1413   if (Params)
1414     std::uninitialized_copy(Params, Params + NumParams,
1415                             getTrailingObjects<ParmVarDecl *>());
1416 }
1417
1418 FunctionParmPackExpr *
1419 FunctionParmPackExpr::Create(const ASTContext &Context, QualType T,
1420                              ParmVarDecl *ParamPack, SourceLocation NameLoc,
1421                              ArrayRef<ParmVarDecl *> Params) {
1422   return new (Context.Allocate(totalSizeToAlloc<ParmVarDecl *>(Params.size())))
1423       FunctionParmPackExpr(T, ParamPack, NameLoc, Params.size(), Params.data());
1424 }
1425
1426 FunctionParmPackExpr *
1427 FunctionParmPackExpr::CreateEmpty(const ASTContext &Context,
1428                                   unsigned NumParams) {
1429   return new (Context.Allocate(totalSizeToAlloc<ParmVarDecl *>(NumParams)))
1430       FunctionParmPackExpr(QualType(), nullptr, SourceLocation(), 0, nullptr);
1431 }
1432
1433 void MaterializeTemporaryExpr::setExtendingDecl(const ValueDecl *ExtendedBy,
1434                                                 unsigned ManglingNumber) {
1435   // We only need extra state if we have to remember more than just the Stmt.
1436   if (!ExtendedBy)
1437     return;
1438
1439   // We may need to allocate extra storage for the mangling number and the
1440   // extended-by ValueDecl.
1441   if (!State.is<ExtraState *>()) {
1442     auto ES = new (ExtendedBy->getASTContext()) ExtraState;
1443     ES->Temporary = State.get<Stmt *>();
1444     State = ES;
1445   }
1446
1447   auto ES = State.get<ExtraState *>();
1448   ES->ExtendingDecl = ExtendedBy;
1449   ES->ManglingNumber = ManglingNumber;
1450 }
1451
1452 TypeTraitExpr::TypeTraitExpr(QualType T, SourceLocation Loc, TypeTrait Kind,
1453                              ArrayRef<TypeSourceInfo *> Args,
1454                              SourceLocation RParenLoc,
1455                              bool Value)
1456   : Expr(TypeTraitExprClass, T, VK_RValue, OK_Ordinary,
1457          /*TypeDependent=*/false,
1458          /*ValueDependent=*/false,
1459          /*InstantiationDependent=*/false,
1460          /*ContainsUnexpandedParameterPack=*/false),
1461     Loc(Loc), RParenLoc(RParenLoc)
1462 {
1463   TypeTraitExprBits.Kind = Kind;
1464   TypeTraitExprBits.Value = Value;
1465   TypeTraitExprBits.NumArgs = Args.size();
1466
1467   TypeSourceInfo **ToArgs = getTrailingObjects<TypeSourceInfo *>();
1468
1469   for (unsigned I = 0, N = Args.size(); I != N; ++I) {
1470     if (Args[I]->getType()->isDependentType())
1471       setValueDependent(true);
1472     if (Args[I]->getType()->isInstantiationDependentType())
1473       setInstantiationDependent(true);
1474     if (Args[I]->getType()->containsUnexpandedParameterPack())
1475       setContainsUnexpandedParameterPack(true);
1476
1477     ToArgs[I] = Args[I];
1478   }
1479 }
1480
1481 TypeTraitExpr *TypeTraitExpr::Create(const ASTContext &C, QualType T,
1482                                      SourceLocation Loc,
1483                                      TypeTrait Kind,
1484                                      ArrayRef<TypeSourceInfo *> Args,
1485                                      SourceLocation RParenLoc,
1486                                      bool Value) {
1487   void *Mem = C.Allocate(totalSizeToAlloc<TypeSourceInfo *>(Args.size()));
1488   return new (Mem) TypeTraitExpr(T, Loc, Kind, Args, RParenLoc, Value);
1489 }
1490
1491 TypeTraitExpr *TypeTraitExpr::CreateDeserialized(const ASTContext &C,
1492                                                  unsigned NumArgs) {
1493   void *Mem = C.Allocate(totalSizeToAlloc<TypeSourceInfo *>(NumArgs));
1494   return new (Mem) TypeTraitExpr(EmptyShell());
1495 }
1496
1497 void ArrayTypeTraitExpr::anchor() { }