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