xref: /freebsd/contrib/llvm-project/clang/lib/AST/ExprCXX.cpp (revision 162ae9c834f6d9f9cb443bd62cceb23e0b5fef48) 
1 //===- ExprCXX.cpp - (C++) Expression AST Node Implementation -------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the subclesses of Expr class declared in ExprCXX.h
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "clang/AST/ExprCXX.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/Attr.h"
16 #include "clang/AST/Decl.h"
17 #include "clang/AST/DeclAccessPair.h"
18 #include "clang/AST/DeclBase.h"
19 #include "clang/AST/DeclCXX.h"
20 #include "clang/AST/DeclarationName.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/AST/LambdaCapture.h"
23 #include "clang/AST/NestedNameSpecifier.h"
24 #include "clang/AST/TemplateBase.h"
25 #include "clang/AST/Type.h"
26 #include "clang/AST/TypeLoc.h"
27 #include "clang/Basic/LLVM.h"
28 #include "clang/Basic/OperatorKinds.h"
29 #include "clang/Basic/SourceLocation.h"
30 #include "clang/Basic/Specifiers.h"
31 #include "llvm/ADT/ArrayRef.h"
32 #include "llvm/Support/Casting.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include <cassert>
35 #include <cstddef>
36 #include <cstring>
37 #include <memory>
38 
39 using namespace clang;
40 
41 //===----------------------------------------------------------------------===//
42 //  Child Iterators for iterating over subexpressions/substatements
43 //===----------------------------------------------------------------------===//
44 
45 bool CXXOperatorCallExpr::isInfixBinaryOp() const {
46   // An infix binary operator is any operator with two arguments other than
47   // operator() and operator[]. Note that none of these operators can have
48   // default arguments, so it suffices to check the number of argument
49   // expressions.
50   if (getNumArgs() != 2)
51     return false;
52 
53   switch (getOperator()) {
54   case OO_Call: case OO_Subscript:
55     return false;
56   default:
57     return true;
58   }
59 }
60 
61 bool CXXTypeidExpr::isPotentiallyEvaluated() const {
62   if (isTypeOperand())
63     return false;
64 
65   // C++11 [expr.typeid]p3:
66   //   When typeid is applied to an expression other than a glvalue of
67   //   polymorphic class type, [...] the expression is an unevaluated operand.
68   const Expr *E = getExprOperand();
69   if (const CXXRecordDecl *RD = E->getType()->getAsCXXRecordDecl())
70     if (RD->isPolymorphic() && E->isGLValue())
71       return true;
72 
73   return false;
74 }
75 
76 QualType CXXTypeidExpr::getTypeOperand(ASTContext &Context) const {
77   assert(isTypeOperand() && "Cannot call getTypeOperand for typeid(expr)");
78   Qualifiers Quals;
79   return Context.getUnqualifiedArrayType(
80       Operand.get<TypeSourceInfo *>()->getType().getNonReferenceType(), Quals);
81 }
82 
83 QualType CXXUuidofExpr::getTypeOperand(ASTContext &Context) const {
84   assert(isTypeOperand() && "Cannot call getTypeOperand for __uuidof(expr)");
85   Qualifiers Quals;
86   return Context.getUnqualifiedArrayType(
87       Operand.get<TypeSourceInfo *>()->getType().getNonReferenceType(), Quals);
88 }
89 
90 // CXXScalarValueInitExpr
91 SourceLocation CXXScalarValueInitExpr::getBeginLoc() const {
92   return TypeInfo ? TypeInfo->getTypeLoc().getBeginLoc() : getRParenLoc();
93 }
94 
95 // CXXNewExpr
96 CXXNewExpr::CXXNewExpr(bool IsGlobalNew, FunctionDecl *OperatorNew,
97                        FunctionDecl *OperatorDelete, bool ShouldPassAlignment,
98                        bool UsualArrayDeleteWantsSize,
99                        ArrayRef<Expr *> PlacementArgs, SourceRange TypeIdParens,
100                        Optional<Expr *> ArraySize,
101                        InitializationStyle InitializationStyle,
102                        Expr *Initializer, QualType Ty,
103                        TypeSourceInfo *AllocatedTypeInfo, SourceRange Range,
104                        SourceRange DirectInitRange)
105     : Expr(CXXNewExprClass, Ty, VK_RValue, OK_Ordinary, Ty->isDependentType(),
106            Ty->isDependentType(), Ty->isInstantiationDependentType(),
107            Ty->containsUnexpandedParameterPack()),
108       OperatorNew(OperatorNew), OperatorDelete(OperatorDelete),
109       AllocatedTypeInfo(AllocatedTypeInfo), Range(Range),
110       DirectInitRange(DirectInitRange) {
111 
112   assert((Initializer != nullptr || InitializationStyle == NoInit) &&
113          "Only NoInit can have no initializer!");
114 
115   CXXNewExprBits.IsGlobalNew = IsGlobalNew;
116   CXXNewExprBits.IsArray = ArraySize.hasValue();
117   CXXNewExprBits.ShouldPassAlignment = ShouldPassAlignment;
118   CXXNewExprBits.UsualArrayDeleteWantsSize = UsualArrayDeleteWantsSize;
119   CXXNewExprBits.StoredInitializationStyle =
120       Initializer ? InitializationStyle + 1 : 0;
121   bool IsParenTypeId = TypeIdParens.isValid();
122   CXXNewExprBits.IsParenTypeId = IsParenTypeId;
123   CXXNewExprBits.NumPlacementArgs = PlacementArgs.size();
124 
125   if (ArraySize) {
126     if (Expr *SizeExpr = *ArraySize) {
127       if (SizeExpr->isInstantiationDependent())
128         ExprBits.InstantiationDependent = true;
129       if (SizeExpr->containsUnexpandedParameterPack())
130         ExprBits.ContainsUnexpandedParameterPack = true;
131     }
132 
133     getTrailingObjects<Stmt *>()[arraySizeOffset()] = *ArraySize;
134   }
135 
136   if (Initializer) {
137     if (Initializer->isInstantiationDependent())
138       ExprBits.InstantiationDependent = true;
139     if (Initializer->containsUnexpandedParameterPack())
140       ExprBits.ContainsUnexpandedParameterPack = true;
141 
142     getTrailingObjects<Stmt *>()[initExprOffset()] = Initializer;
143   }
144 
145   for (unsigned I = 0; I != PlacementArgs.size(); ++I) {
146     if (PlacementArgs[I]->isInstantiationDependent())
147       ExprBits.InstantiationDependent = true;
148     if (PlacementArgs[I]->containsUnexpandedParameterPack())
149       ExprBits.ContainsUnexpandedParameterPack = true;
150 
151     getTrailingObjects<Stmt *>()[placementNewArgsOffset() + I] =
152         PlacementArgs[I];
153   }
154 
155   if (IsParenTypeId)
156     getTrailingObjects<SourceRange>()[0] = TypeIdParens;
157 
158   switch (getInitializationStyle()) {
159   case CallInit:
160     this->Range.setEnd(DirectInitRange.getEnd());
161     break;
162   case ListInit:
163     this->Range.setEnd(getInitializer()->getSourceRange().getEnd());
164     break;
165   default:
166     if (IsParenTypeId)
167       this->Range.setEnd(TypeIdParens.getEnd());
168     break;
169   }
170 }
171 
172 CXXNewExpr::CXXNewExpr(EmptyShell Empty, bool IsArray,
173                        unsigned NumPlacementArgs, bool IsParenTypeId)
174     : Expr(CXXNewExprClass, Empty) {
175   CXXNewExprBits.IsArray = IsArray;
176   CXXNewExprBits.NumPlacementArgs = NumPlacementArgs;
177   CXXNewExprBits.IsParenTypeId = IsParenTypeId;
178 }
179 
180 CXXNewExpr *
181 CXXNewExpr::Create(const ASTContext &Ctx, bool IsGlobalNew,
182                    FunctionDecl *OperatorNew, FunctionDecl *OperatorDelete,
183                    bool ShouldPassAlignment, bool UsualArrayDeleteWantsSize,
184                    ArrayRef<Expr *> PlacementArgs, SourceRange TypeIdParens,
185                    Optional<Expr *> ArraySize,
186                    InitializationStyle InitializationStyle, Expr *Initializer,
187                    QualType Ty, TypeSourceInfo *AllocatedTypeInfo,
188                    SourceRange Range, SourceRange DirectInitRange) {
189   bool IsArray = ArraySize.hasValue();
190   bool HasInit = Initializer != nullptr;
191   unsigned NumPlacementArgs = PlacementArgs.size();
192   bool IsParenTypeId = TypeIdParens.isValid();
193   void *Mem =
194       Ctx.Allocate(totalSizeToAlloc<Stmt *, SourceRange>(
195                        IsArray + HasInit + NumPlacementArgs, IsParenTypeId),
196                    alignof(CXXNewExpr));
197   return new (Mem)
198       CXXNewExpr(IsGlobalNew, OperatorNew, OperatorDelete, ShouldPassAlignment,
199                  UsualArrayDeleteWantsSize, PlacementArgs, TypeIdParens,
200                  ArraySize, InitializationStyle, Initializer, Ty,
201                  AllocatedTypeInfo, Range, DirectInitRange);
202 }
203 
204 CXXNewExpr *CXXNewExpr::CreateEmpty(const ASTContext &Ctx, bool IsArray,
205                                     bool HasInit, unsigned NumPlacementArgs,
206                                     bool IsParenTypeId) {
207   void *Mem =
208       Ctx.Allocate(totalSizeToAlloc<Stmt *, SourceRange>(
209                        IsArray + HasInit + NumPlacementArgs, IsParenTypeId),
210                    alignof(CXXNewExpr));
211   return new (Mem)
212       CXXNewExpr(EmptyShell(), IsArray, NumPlacementArgs, IsParenTypeId);
213 }
214 
215 bool CXXNewExpr::shouldNullCheckAllocation() const {
216   return getOperatorNew()
217              ->getType()
218              ->castAs<FunctionProtoType>()
219              ->isNothrow() &&
220          !getOperatorNew()->isReservedGlobalPlacementOperator();
221 }
222 
223 // CXXDeleteExpr
224 QualType CXXDeleteExpr::getDestroyedType() const {
225   const Expr *Arg = getArgument();
226 
227   // For a destroying operator delete, we may have implicitly converted the
228   // pointer type to the type of the parameter of the 'operator delete'
229   // function.
230   while (const auto *ICE = dyn_cast<ImplicitCastExpr>(Arg)) {
231     if (ICE->getCastKind() == CK_DerivedToBase ||
232         ICE->getCastKind() == CK_UncheckedDerivedToBase ||
233         ICE->getCastKind() == CK_NoOp) {
234       assert((ICE->getCastKind() == CK_NoOp ||
235               getOperatorDelete()->isDestroyingOperatorDelete()) &&
236              "only a destroying operator delete can have a converted arg");
237       Arg = ICE->getSubExpr();
238     } else
239       break;
240   }
241 
242   // The type-to-delete may not be a pointer if it's a dependent type.
243   const QualType ArgType = Arg->getType();
244 
245   if (ArgType->isDependentType() && !ArgType->isPointerType())
246     return QualType();
247 
248   return ArgType->getAs<PointerType>()->getPointeeType();
249 }
250 
251 // CXXPseudoDestructorExpr
252 PseudoDestructorTypeStorage::PseudoDestructorTypeStorage(TypeSourceInfo *Info)
253     : Type(Info) {
254   Location = Info->getTypeLoc().getLocalSourceRange().getBegin();
255 }
256 
257 CXXPseudoDestructorExpr::CXXPseudoDestructorExpr(const ASTContext &Context,
258                 Expr *Base, bool isArrow, SourceLocation OperatorLoc,
259                 NestedNameSpecifierLoc QualifierLoc, TypeSourceInfo *ScopeType,
260                 SourceLocation ColonColonLoc, SourceLocation TildeLoc,
261                 PseudoDestructorTypeStorage DestroyedType)
262   : Expr(CXXPseudoDestructorExprClass,
263          Context.BoundMemberTy,
264          VK_RValue, OK_Ordinary,
265          /*isTypeDependent=*/(Base->isTypeDependent() ||
266            (DestroyedType.getTypeSourceInfo() &&
267             DestroyedType.getTypeSourceInfo()->getType()->isDependentType())),
268          /*isValueDependent=*/Base->isValueDependent(),
269          (Base->isInstantiationDependent() ||
270           (QualifierLoc &&
271            QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent()) ||
272           (ScopeType &&
273            ScopeType->getType()->isInstantiationDependentType()) ||
274           (DestroyedType.getTypeSourceInfo() &&
275            DestroyedType.getTypeSourceInfo()->getType()
276                                              ->isInstantiationDependentType())),
277          // ContainsUnexpandedParameterPack
278          (Base->containsUnexpandedParameterPack() ||
279           (QualifierLoc &&
280            QualifierLoc.getNestedNameSpecifier()
281                                         ->containsUnexpandedParameterPack()) ||
282           (ScopeType &&
283            ScopeType->getType()->containsUnexpandedParameterPack()) ||
284           (DestroyedType.getTypeSourceInfo() &&
285            DestroyedType.getTypeSourceInfo()->getType()
286                                    ->containsUnexpandedParameterPack()))),
287     Base(static_cast<Stmt *>(Base)), IsArrow(isArrow),
288     OperatorLoc(OperatorLoc), QualifierLoc(QualifierLoc),
289     ScopeType(ScopeType), ColonColonLoc(ColonColonLoc), TildeLoc(TildeLoc),
290     DestroyedType(DestroyedType) {}
291 
292 QualType CXXPseudoDestructorExpr::getDestroyedType() const {
293   if (TypeSourceInfo *TInfo = DestroyedType.getTypeSourceInfo())
294     return TInfo->getType();
295 
296   return QualType();
297 }
298 
299 SourceLocation CXXPseudoDestructorExpr::getEndLoc() const {
300   SourceLocation End = DestroyedType.getLocation();
301   if (TypeSourceInfo *TInfo = DestroyedType.getTypeSourceInfo())
302     End = TInfo->getTypeLoc().getLocalSourceRange().getEnd();
303   return End;
304 }
305 
306 // UnresolvedLookupExpr
307 UnresolvedLookupExpr::UnresolvedLookupExpr(
308     const ASTContext &Context, CXXRecordDecl *NamingClass,
309     NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
310     const DeclarationNameInfo &NameInfo, bool RequiresADL, bool Overloaded,
311     const TemplateArgumentListInfo *TemplateArgs, UnresolvedSetIterator Begin,
312     UnresolvedSetIterator End)
313     : OverloadExpr(UnresolvedLookupExprClass, Context, QualifierLoc,
314                    TemplateKWLoc, NameInfo, TemplateArgs, Begin, End, false,
315                    false, false),
316       NamingClass(NamingClass) {
317   UnresolvedLookupExprBits.RequiresADL = RequiresADL;
318   UnresolvedLookupExprBits.Overloaded = Overloaded;
319 }
320 
321 UnresolvedLookupExpr::UnresolvedLookupExpr(EmptyShell Empty,
322                                            unsigned NumResults,
323                                            bool HasTemplateKWAndArgsInfo)
324     : OverloadExpr(UnresolvedLookupExprClass, Empty, NumResults,
325                    HasTemplateKWAndArgsInfo) {}
326 
327 UnresolvedLookupExpr *UnresolvedLookupExpr::Create(
328     const ASTContext &Context, CXXRecordDecl *NamingClass,
329     NestedNameSpecifierLoc QualifierLoc, const DeclarationNameInfo &NameInfo,
330     bool RequiresADL, bool Overloaded, UnresolvedSetIterator Begin,
331     UnresolvedSetIterator End) {
332   unsigned NumResults = End - Begin;
333   unsigned Size = totalSizeToAlloc<DeclAccessPair, ASTTemplateKWAndArgsInfo,
334                                    TemplateArgumentLoc>(NumResults, 0, 0);
335   void *Mem = Context.Allocate(Size, alignof(UnresolvedLookupExpr));
336   return new (Mem) UnresolvedLookupExpr(Context, NamingClass, QualifierLoc,
337                                         SourceLocation(), NameInfo, RequiresADL,
338                                         Overloaded, nullptr, Begin, End);
339 }
340 
341 UnresolvedLookupExpr *UnresolvedLookupExpr::Create(
342     const ASTContext &Context, CXXRecordDecl *NamingClass,
343     NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
344     const DeclarationNameInfo &NameInfo, bool RequiresADL,
345     const TemplateArgumentListInfo *Args, UnresolvedSetIterator Begin,
346     UnresolvedSetIterator End) {
347   assert(Args || TemplateKWLoc.isValid());
348   unsigned NumResults = End - Begin;
349   unsigned NumTemplateArgs = Args ? Args->size() : 0;
350   unsigned Size =
351       totalSizeToAlloc<DeclAccessPair, ASTTemplateKWAndArgsInfo,
352                        TemplateArgumentLoc>(NumResults, 1, NumTemplateArgs);
353   void *Mem = Context.Allocate(Size, alignof(UnresolvedLookupExpr));
354   return new (Mem) UnresolvedLookupExpr(Context, NamingClass, QualifierLoc,
355                                         TemplateKWLoc, NameInfo, RequiresADL,
356                                         /*Overloaded*/ true, Args, Begin, End);
357 }
358 
359 UnresolvedLookupExpr *UnresolvedLookupExpr::CreateEmpty(
360     const ASTContext &Context, unsigned NumResults,
361     bool HasTemplateKWAndArgsInfo, unsigned NumTemplateArgs) {
362   assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
363   unsigned Size = totalSizeToAlloc<DeclAccessPair, ASTTemplateKWAndArgsInfo,
364                                    TemplateArgumentLoc>(
365       NumResults, HasTemplateKWAndArgsInfo, NumTemplateArgs);
366   void *Mem = Context.Allocate(Size, alignof(UnresolvedLookupExpr));
367   return new (Mem)
368       UnresolvedLookupExpr(EmptyShell(), NumResults, HasTemplateKWAndArgsInfo);
369 }
370 
371 OverloadExpr::OverloadExpr(StmtClass SC, const ASTContext &Context,
372                            NestedNameSpecifierLoc QualifierLoc,
373                            SourceLocation TemplateKWLoc,
374                            const DeclarationNameInfo &NameInfo,
375                            const TemplateArgumentListInfo *TemplateArgs,
376                            UnresolvedSetIterator Begin,
377                            UnresolvedSetIterator End, bool KnownDependent,
378                            bool KnownInstantiationDependent,
379                            bool KnownContainsUnexpandedParameterPack)
380     : Expr(
381           SC, Context.OverloadTy, VK_LValue, OK_Ordinary, KnownDependent,
382           KnownDependent,
383           (KnownInstantiationDependent || NameInfo.isInstantiationDependent() ||
384            (QualifierLoc &&
385             QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent())),
386           (KnownContainsUnexpandedParameterPack ||
387            NameInfo.containsUnexpandedParameterPack() ||
388            (QualifierLoc && QualifierLoc.getNestedNameSpecifier()
389                                 ->containsUnexpandedParameterPack()))),
390       NameInfo(NameInfo), QualifierLoc(QualifierLoc) {
391   unsigned NumResults = End - Begin;
392   OverloadExprBits.NumResults = NumResults;
393   OverloadExprBits.HasTemplateKWAndArgsInfo =
394       (TemplateArgs != nullptr ) || TemplateKWLoc.isValid();
395 
396   if (NumResults) {
397     // Determine whether this expression is type-dependent.
398     for (UnresolvedSetImpl::const_iterator I = Begin; I != End; ++I) {
399       if ((*I)->getDeclContext()->isDependentContext() ||
400           isa<UnresolvedUsingValueDecl>(*I)) {
401         ExprBits.TypeDependent = true;
402         ExprBits.ValueDependent = true;
403         ExprBits.InstantiationDependent = true;
404       }
405     }
406 
407     // Copy the results to the trailing array past UnresolvedLookupExpr
408     // or UnresolvedMemberExpr.
409     DeclAccessPair *Results = getTrailingResults();
410     memcpy(Results, Begin.I, NumResults * sizeof(DeclAccessPair));
411   }
412 
413   // If we have explicit template arguments, check for dependent
414   // template arguments and whether they contain any unexpanded pack
415   // expansions.
416   if (TemplateArgs) {
417     bool Dependent = false;
418     bool InstantiationDependent = false;
419     bool ContainsUnexpandedParameterPack = false;
420     getTrailingASTTemplateKWAndArgsInfo()->initializeFrom(
421         TemplateKWLoc, *TemplateArgs, getTrailingTemplateArgumentLoc(),
422         Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
423 
424     if (Dependent) {
425       ExprBits.TypeDependent = true;
426       ExprBits.ValueDependent = true;
427     }
428     if (InstantiationDependent)
429       ExprBits.InstantiationDependent = true;
430     if (ContainsUnexpandedParameterPack)
431       ExprBits.ContainsUnexpandedParameterPack = true;
432   } else if (TemplateKWLoc.isValid()) {
433     getTrailingASTTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc);
434   }
435 
436   if (isTypeDependent())
437     setType(Context.DependentTy);
438 }
439 
440 OverloadExpr::OverloadExpr(StmtClass SC, EmptyShell Empty, unsigned NumResults,
441                            bool HasTemplateKWAndArgsInfo)
442     : Expr(SC, Empty) {
443   OverloadExprBits.NumResults = NumResults;
444   OverloadExprBits.HasTemplateKWAndArgsInfo = HasTemplateKWAndArgsInfo;
445 }
446 
447 // DependentScopeDeclRefExpr
448 DependentScopeDeclRefExpr::DependentScopeDeclRefExpr(
449     QualType Ty, NestedNameSpecifierLoc QualifierLoc,
450     SourceLocation TemplateKWLoc, const DeclarationNameInfo &NameInfo,
451     const TemplateArgumentListInfo *Args)
452     : Expr(
453           DependentScopeDeclRefExprClass, Ty, VK_LValue, OK_Ordinary, true,
454           true,
455           (NameInfo.isInstantiationDependent() ||
456            (QualifierLoc &&
457             QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent())),
458           (NameInfo.containsUnexpandedParameterPack() ||
459            (QualifierLoc && QualifierLoc.getNestedNameSpecifier()
460                                 ->containsUnexpandedParameterPack()))),
461       QualifierLoc(QualifierLoc), NameInfo(NameInfo) {
462   DependentScopeDeclRefExprBits.HasTemplateKWAndArgsInfo =
463       (Args != nullptr) || TemplateKWLoc.isValid();
464   if (Args) {
465     bool Dependent = true;
466     bool InstantiationDependent = true;
467     bool ContainsUnexpandedParameterPack
468       = ExprBits.ContainsUnexpandedParameterPack;
469     getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
470         TemplateKWLoc, *Args, getTrailingObjects<TemplateArgumentLoc>(),
471         Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
472     ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack;
473   } else if (TemplateKWLoc.isValid()) {
474     getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
475         TemplateKWLoc);
476   }
477 }
478 
479 DependentScopeDeclRefExpr *DependentScopeDeclRefExpr::Create(
480     const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc,
481     SourceLocation TemplateKWLoc, const DeclarationNameInfo &NameInfo,
482     const TemplateArgumentListInfo *Args) {
483   assert(QualifierLoc && "should be created for dependent qualifiers");
484   bool HasTemplateKWAndArgsInfo = Args || TemplateKWLoc.isValid();
485   std::size_t Size =
486       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
487           HasTemplateKWAndArgsInfo, Args ? Args->size() : 0);
488   void *Mem = Context.Allocate(Size);
489   return new (Mem) DependentScopeDeclRefExpr(Context.DependentTy, QualifierLoc,
490                                              TemplateKWLoc, NameInfo, Args);
491 }
492 
493 DependentScopeDeclRefExpr *
494 DependentScopeDeclRefExpr::CreateEmpty(const ASTContext &Context,
495                                        bool HasTemplateKWAndArgsInfo,
496                                        unsigned NumTemplateArgs) {
497   assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
498   std::size_t Size =
499       totalSizeToAlloc<ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
500           HasTemplateKWAndArgsInfo, NumTemplateArgs);
501   void *Mem = Context.Allocate(Size);
502   auto *E = new (Mem) DependentScopeDeclRefExpr(
503       QualType(), NestedNameSpecifierLoc(), SourceLocation(),
504       DeclarationNameInfo(), nullptr);
505   E->DependentScopeDeclRefExprBits.HasTemplateKWAndArgsInfo =
506       HasTemplateKWAndArgsInfo;
507   return E;
508 }
509 
510 SourceLocation CXXConstructExpr::getBeginLoc() const {
511   if (isa<CXXTemporaryObjectExpr>(this))
512     return cast<CXXTemporaryObjectExpr>(this)->getBeginLoc();
513   return getLocation();
514 }
515 
516 SourceLocation CXXConstructExpr::getEndLoc() const {
517   if (isa<CXXTemporaryObjectExpr>(this))
518     return cast<CXXTemporaryObjectExpr>(this)->getEndLoc();
519 
520   if (ParenOrBraceRange.isValid())
521     return ParenOrBraceRange.getEnd();
522 
523   SourceLocation End = getLocation();
524   for (unsigned I = getNumArgs(); I > 0; --I) {
525     const Expr *Arg = getArg(I-1);
526     if (!Arg->isDefaultArgument()) {
527       SourceLocation NewEnd = Arg->getEndLoc();
528       if (NewEnd.isValid()) {
529         End = NewEnd;
530         break;
531       }
532     }
533   }
534 
535   return End;
536 }
537 
538 CXXOperatorCallExpr::CXXOperatorCallExpr(OverloadedOperatorKind OpKind,
539                                          Expr *Fn, ArrayRef<Expr *> Args,
540                                          QualType Ty, ExprValueKind VK,
541                                          SourceLocation OperatorLoc,
542                                          FPOptions FPFeatures,
543                                          ADLCallKind UsesADL)
544     : CallExpr(CXXOperatorCallExprClass, Fn, /*PreArgs=*/{}, Args, Ty, VK,
545                OperatorLoc, /*MinNumArgs=*/0, UsesADL) {
546   CXXOperatorCallExprBits.OperatorKind = OpKind;
547   CXXOperatorCallExprBits.FPFeatures = FPFeatures.getInt();
548   assert(
549       (CXXOperatorCallExprBits.OperatorKind == static_cast<unsigned>(OpKind)) &&
550       "OperatorKind overflow!");
551   assert((CXXOperatorCallExprBits.FPFeatures == FPFeatures.getInt()) &&
552          "FPFeatures overflow!");
553   Range = getSourceRangeImpl();
554 }
555 
556 CXXOperatorCallExpr::CXXOperatorCallExpr(unsigned NumArgs, EmptyShell Empty)
557     : CallExpr(CXXOperatorCallExprClass, /*NumPreArgs=*/0, NumArgs, Empty) {}
558 
559 CXXOperatorCallExpr *CXXOperatorCallExpr::Create(
560     const ASTContext &Ctx, OverloadedOperatorKind OpKind, Expr *Fn,
561     ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
562     SourceLocation OperatorLoc, FPOptions FPFeatures, ADLCallKind UsesADL) {
563   // Allocate storage for the trailing objects of CallExpr.
564   unsigned NumArgs = Args.size();
565   unsigned SizeOfTrailingObjects =
566       CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs);
567   void *Mem = Ctx.Allocate(sizeof(CXXOperatorCallExpr) + SizeOfTrailingObjects,
568                            alignof(CXXOperatorCallExpr));
569   return new (Mem) CXXOperatorCallExpr(OpKind, Fn, Args, Ty, VK, OperatorLoc,
570                                        FPFeatures, UsesADL);
571 }
572 
573 CXXOperatorCallExpr *CXXOperatorCallExpr::CreateEmpty(const ASTContext &Ctx,
574                                                       unsigned NumArgs,
575                                                       EmptyShell Empty) {
576   // Allocate storage for the trailing objects of CallExpr.
577   unsigned SizeOfTrailingObjects =
578       CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs);
579   void *Mem = Ctx.Allocate(sizeof(CXXOperatorCallExpr) + SizeOfTrailingObjects,
580                            alignof(CXXOperatorCallExpr));
581   return new (Mem) CXXOperatorCallExpr(NumArgs, Empty);
582 }
583 
584 SourceRange CXXOperatorCallExpr::getSourceRangeImpl() const {
585   OverloadedOperatorKind Kind = getOperator();
586   if (Kind == OO_PlusPlus || Kind == OO_MinusMinus) {
587     if (getNumArgs() == 1)
588       // Prefix operator
589       return SourceRange(getOperatorLoc(), getArg(0)->getEndLoc());
590     else
591       // Postfix operator
592       return SourceRange(getArg(0)->getBeginLoc(), getOperatorLoc());
593   } else if (Kind == OO_Arrow) {
594     return getArg(0)->getSourceRange();
595   } else if (Kind == OO_Call) {
596     return SourceRange(getArg(0)->getBeginLoc(), getRParenLoc());
597   } else if (Kind == OO_Subscript) {
598     return SourceRange(getArg(0)->getBeginLoc(), getRParenLoc());
599   } else if (getNumArgs() == 1) {
600     return SourceRange(getOperatorLoc(), getArg(0)->getEndLoc());
601   } else if (getNumArgs() == 2) {
602     return SourceRange(getArg(0)->getBeginLoc(), getArg(1)->getEndLoc());
603   } else {
604     return getOperatorLoc();
605   }
606 }
607 
608 CXXMemberCallExpr::CXXMemberCallExpr(Expr *Fn, ArrayRef<Expr *> Args,
609                                      QualType Ty, ExprValueKind VK,
610                                      SourceLocation RP, unsigned MinNumArgs)
611     : CallExpr(CXXMemberCallExprClass, Fn, /*PreArgs=*/{}, Args, Ty, VK, RP,
612                MinNumArgs, NotADL) {}
613 
614 CXXMemberCallExpr::CXXMemberCallExpr(unsigned NumArgs, EmptyShell Empty)
615     : CallExpr(CXXMemberCallExprClass, /*NumPreArgs=*/0, NumArgs, Empty) {}
616 
617 CXXMemberCallExpr *CXXMemberCallExpr::Create(const ASTContext &Ctx, Expr *Fn,
618                                              ArrayRef<Expr *> Args, QualType Ty,
619                                              ExprValueKind VK,
620                                              SourceLocation RP,
621                                              unsigned MinNumArgs) {
622   // Allocate storage for the trailing objects of CallExpr.
623   unsigned NumArgs = std::max<unsigned>(Args.size(), MinNumArgs);
624   unsigned SizeOfTrailingObjects =
625       CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs);
626   void *Mem = Ctx.Allocate(sizeof(CXXMemberCallExpr) + SizeOfTrailingObjects,
627                            alignof(CXXMemberCallExpr));
628   return new (Mem) CXXMemberCallExpr(Fn, Args, Ty, VK, RP, MinNumArgs);
629 }
630 
631 CXXMemberCallExpr *CXXMemberCallExpr::CreateEmpty(const ASTContext &Ctx,
632                                                   unsigned NumArgs,
633                                                   EmptyShell Empty) {
634   // Allocate storage for the trailing objects of CallExpr.
635   unsigned SizeOfTrailingObjects =
636       CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs);
637   void *Mem = Ctx.Allocate(sizeof(CXXMemberCallExpr) + SizeOfTrailingObjects,
638                            alignof(CXXMemberCallExpr));
639   return new (Mem) CXXMemberCallExpr(NumArgs, Empty);
640 }
641 
642 Expr *CXXMemberCallExpr::getImplicitObjectArgument() const {
643   const Expr *Callee = getCallee()->IgnoreParens();
644   if (const auto *MemExpr = dyn_cast<MemberExpr>(Callee))
645     return MemExpr->getBase();
646   if (const auto *BO = dyn_cast<BinaryOperator>(Callee))
647     if (BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI)
648       return BO->getLHS();
649 
650   // FIXME: Will eventually need to cope with member pointers.
651   return nullptr;
652 }
653 
654 QualType CXXMemberCallExpr::getObjectType() const {
655   QualType Ty = getImplicitObjectArgument()->getType();
656   if (Ty->isPointerType())
657     Ty = Ty->getPointeeType();
658   return Ty;
659 }
660 
661 CXXMethodDecl *CXXMemberCallExpr::getMethodDecl() const {
662   if (const auto *MemExpr = dyn_cast<MemberExpr>(getCallee()->IgnoreParens()))
663     return cast<CXXMethodDecl>(MemExpr->getMemberDecl());
664 
665   // FIXME: Will eventually need to cope with member pointers.
666   return nullptr;
667 }
668 
669 CXXRecordDecl *CXXMemberCallExpr::getRecordDecl() const {
670   Expr* ThisArg = getImplicitObjectArgument();
671   if (!ThisArg)
672     return nullptr;
673 
674   if (ThisArg->getType()->isAnyPointerType())
675     return ThisArg->getType()->getPointeeType()->getAsCXXRecordDecl();
676 
677   return ThisArg->getType()->getAsCXXRecordDecl();
678 }
679 
680 //===----------------------------------------------------------------------===//
681 //  Named casts
682 //===----------------------------------------------------------------------===//
683 
684 /// getCastName - Get the name of the C++ cast being used, e.g.,
685 /// "static_cast", "dynamic_cast", "reinterpret_cast", or
686 /// "const_cast". The returned pointer must not be freed.
687 const char *CXXNamedCastExpr::getCastName() const {
688   switch (getStmtClass()) {
689   case CXXStaticCastExprClass:      return "static_cast";
690   case CXXDynamicCastExprClass:     return "dynamic_cast";
691   case CXXReinterpretCastExprClass: return "reinterpret_cast";
692   case CXXConstCastExprClass:       return "const_cast";
693   default:                          return "<invalid cast>";
694   }
695 }
696 
697 CXXStaticCastExpr *CXXStaticCastExpr::Create(const ASTContext &C, QualType T,
698                                              ExprValueKind VK,
699                                              CastKind K, Expr *Op,
700                                              const CXXCastPath *BasePath,
701                                              TypeSourceInfo *WrittenTy,
702                                              SourceLocation L,
703                                              SourceLocation RParenLoc,
704                                              SourceRange AngleBrackets) {
705   unsigned PathSize = (BasePath ? BasePath->size() : 0);
706   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
707   auto *E =
708       new (Buffer) CXXStaticCastExpr(T, VK, K, Op, PathSize, WrittenTy, L,
709                                      RParenLoc, AngleBrackets);
710   if (PathSize)
711     std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
712                               E->getTrailingObjects<CXXBaseSpecifier *>());
713   return E;
714 }
715 
716 CXXStaticCastExpr *CXXStaticCastExpr::CreateEmpty(const ASTContext &C,
717                                                   unsigned PathSize) {
718   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
719   return new (Buffer) CXXStaticCastExpr(EmptyShell(), PathSize);
720 }
721 
722 CXXDynamicCastExpr *CXXDynamicCastExpr::Create(const ASTContext &C, QualType T,
723                                                ExprValueKind VK,
724                                                CastKind K, Expr *Op,
725                                                const CXXCastPath *BasePath,
726                                                TypeSourceInfo *WrittenTy,
727                                                SourceLocation L,
728                                                SourceLocation RParenLoc,
729                                                SourceRange AngleBrackets) {
730   unsigned PathSize = (BasePath ? BasePath->size() : 0);
731   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
732   auto *E =
733       new (Buffer) CXXDynamicCastExpr(T, VK, K, Op, PathSize, WrittenTy, L,
734                                       RParenLoc, AngleBrackets);
735   if (PathSize)
736     std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
737                               E->getTrailingObjects<CXXBaseSpecifier *>());
738   return E;
739 }
740 
741 CXXDynamicCastExpr *CXXDynamicCastExpr::CreateEmpty(const ASTContext &C,
742                                                     unsigned PathSize) {
743   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
744   return new (Buffer) CXXDynamicCastExpr(EmptyShell(), PathSize);
745 }
746 
747 /// isAlwaysNull - Return whether the result of the dynamic_cast is proven
748 /// to always be null. For example:
749 ///
750 /// struct A { };
751 /// struct B final : A { };
752 /// struct C { };
753 ///
754 /// C *f(B* b) { return dynamic_cast<C*>(b); }
755 bool CXXDynamicCastExpr::isAlwaysNull() const
756 {
757   QualType SrcType = getSubExpr()->getType();
758   QualType DestType = getType();
759 
760   if (const auto *SrcPTy = SrcType->getAs<PointerType>()) {
761     SrcType = SrcPTy->getPointeeType();
762     DestType = DestType->castAs<PointerType>()->getPointeeType();
763   }
764 
765   if (DestType->isVoidType())
766     return false;
767 
768   const auto *SrcRD =
769       cast<CXXRecordDecl>(SrcType->castAs<RecordType>()->getDecl());
770 
771   if (!SrcRD->hasAttr<FinalAttr>())
772     return false;
773 
774   const auto *DestRD =
775       cast<CXXRecordDecl>(DestType->castAs<RecordType>()->getDecl());
776 
777   return !DestRD->isDerivedFrom(SrcRD);
778 }
779 
780 CXXReinterpretCastExpr *
781 CXXReinterpretCastExpr::Create(const ASTContext &C, QualType T,
782                                ExprValueKind VK, CastKind K, Expr *Op,
783                                const CXXCastPath *BasePath,
784                                TypeSourceInfo *WrittenTy, SourceLocation L,
785                                SourceLocation RParenLoc,
786                                SourceRange AngleBrackets) {
787   unsigned PathSize = (BasePath ? BasePath->size() : 0);
788   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
789   auto *E =
790       new (Buffer) CXXReinterpretCastExpr(T, VK, K, Op, PathSize, WrittenTy, L,
791                                           RParenLoc, AngleBrackets);
792   if (PathSize)
793     std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
794                               E->getTrailingObjects<CXXBaseSpecifier *>());
795   return E;
796 }
797 
798 CXXReinterpretCastExpr *
799 CXXReinterpretCastExpr::CreateEmpty(const ASTContext &C, unsigned PathSize) {
800   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
801   return new (Buffer) CXXReinterpretCastExpr(EmptyShell(), PathSize);
802 }
803 
804 CXXConstCastExpr *CXXConstCastExpr::Create(const ASTContext &C, QualType T,
805                                            ExprValueKind VK, Expr *Op,
806                                            TypeSourceInfo *WrittenTy,
807                                            SourceLocation L,
808                                            SourceLocation RParenLoc,
809                                            SourceRange AngleBrackets) {
810   return new (C) CXXConstCastExpr(T, VK, Op, WrittenTy, L, RParenLoc, AngleBrackets);
811 }
812 
813 CXXConstCastExpr *CXXConstCastExpr::CreateEmpty(const ASTContext &C) {
814   return new (C) CXXConstCastExpr(EmptyShell());
815 }
816 
817 CXXFunctionalCastExpr *
818 CXXFunctionalCastExpr::Create(const ASTContext &C, QualType T, ExprValueKind VK,
819                               TypeSourceInfo *Written, CastKind K, Expr *Op,
820                               const CXXCastPath *BasePath,
821                               SourceLocation L, SourceLocation R) {
822   unsigned PathSize = (BasePath ? BasePath->size() : 0);
823   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
824   auto *E =
825       new (Buffer) CXXFunctionalCastExpr(T, VK, Written, K, Op, PathSize, L, R);
826   if (PathSize)
827     std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
828                               E->getTrailingObjects<CXXBaseSpecifier *>());
829   return E;
830 }
831 
832 CXXFunctionalCastExpr *
833 CXXFunctionalCastExpr::CreateEmpty(const ASTContext &C, unsigned PathSize) {
834   void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
835   return new (Buffer) CXXFunctionalCastExpr(EmptyShell(), PathSize);
836 }
837 
838 SourceLocation CXXFunctionalCastExpr::getBeginLoc() const {
839   return getTypeInfoAsWritten()->getTypeLoc().getBeginLoc();
840 }
841 
842 SourceLocation CXXFunctionalCastExpr::getEndLoc() const {
843   return RParenLoc.isValid() ? RParenLoc : getSubExpr()->getEndLoc();
844 }
845 
846 UserDefinedLiteral::UserDefinedLiteral(Expr *Fn, ArrayRef<Expr *> Args,
847                                        QualType Ty, ExprValueKind VK,
848                                        SourceLocation LitEndLoc,
849                                        SourceLocation SuffixLoc)
850     : CallExpr(UserDefinedLiteralClass, Fn, /*PreArgs=*/{}, Args, Ty, VK,
851                LitEndLoc, /*MinNumArgs=*/0, NotADL),
852       UDSuffixLoc(SuffixLoc) {}
853 
854 UserDefinedLiteral::UserDefinedLiteral(unsigned NumArgs, EmptyShell Empty)
855     : CallExpr(UserDefinedLiteralClass, /*NumPreArgs=*/0, NumArgs, Empty) {}
856 
857 UserDefinedLiteral *UserDefinedLiteral::Create(const ASTContext &Ctx, Expr *Fn,
858                                                ArrayRef<Expr *> Args,
859                                                QualType Ty, ExprValueKind VK,
860                                                SourceLocation LitEndLoc,
861                                                SourceLocation SuffixLoc) {
862   // Allocate storage for the trailing objects of CallExpr.
863   unsigned NumArgs = Args.size();
864   unsigned SizeOfTrailingObjects =
865       CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs);
866   void *Mem = Ctx.Allocate(sizeof(UserDefinedLiteral) + SizeOfTrailingObjects,
867                            alignof(UserDefinedLiteral));
868   return new (Mem) UserDefinedLiteral(Fn, Args, Ty, VK, LitEndLoc, SuffixLoc);
869 }
870 
871 UserDefinedLiteral *UserDefinedLiteral::CreateEmpty(const ASTContext &Ctx,
872                                                     unsigned NumArgs,
873                                                     EmptyShell Empty) {
874   // Allocate storage for the trailing objects of CallExpr.
875   unsigned SizeOfTrailingObjects =
876       CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs);
877   void *Mem = Ctx.Allocate(sizeof(UserDefinedLiteral) + SizeOfTrailingObjects,
878                            alignof(UserDefinedLiteral));
879   return new (Mem) UserDefinedLiteral(NumArgs, Empty);
880 }
881 
882 UserDefinedLiteral::LiteralOperatorKind
883 UserDefinedLiteral::getLiteralOperatorKind() const {
884   if (getNumArgs() == 0)
885     return LOK_Template;
886   if (getNumArgs() == 2)
887     return LOK_String;
888 
889   assert(getNumArgs() == 1 && "unexpected #args in literal operator call");
890   QualType ParamTy =
891     cast<FunctionDecl>(getCalleeDecl())->getParamDecl(0)->getType();
892   if (ParamTy->isPointerType())
893     return LOK_Raw;
894   if (ParamTy->isAnyCharacterType())
895     return LOK_Character;
896   if (ParamTy->isIntegerType())
897     return LOK_Integer;
898   if (ParamTy->isFloatingType())
899     return LOK_Floating;
900 
901   llvm_unreachable("unknown kind of literal operator");
902 }
903 
904 Expr *UserDefinedLiteral::getCookedLiteral() {
905 #ifndef NDEBUG
906   LiteralOperatorKind LOK = getLiteralOperatorKind();
907   assert(LOK != LOK_Template && LOK != LOK_Raw && "not a cooked literal");
908 #endif
909   return getArg(0);
910 }
911 
912 const IdentifierInfo *UserDefinedLiteral::getUDSuffix() const {
913   return cast<FunctionDecl>(getCalleeDecl())->getLiteralIdentifier();
914 }
915 
916 CXXDefaultInitExpr::CXXDefaultInitExpr(const ASTContext &Ctx, SourceLocation Loc,
917                                        FieldDecl *Field, QualType Ty,
918                                        DeclContext *UsedContext)
919     : Expr(CXXDefaultInitExprClass, Ty.getNonLValueExprType(Ctx),
920            Ty->isLValueReferenceType() ? VK_LValue : Ty->isRValueReferenceType()
921                                                         ? VK_XValue
922                                                         : VK_RValue,
923            /*FIXME*/ OK_Ordinary, false, false, false, false),
924       Field(Field), UsedContext(UsedContext) {
925   CXXDefaultInitExprBits.Loc = Loc;
926   assert(Field->hasInClassInitializer());
927 }
928 
929 CXXTemporary *CXXTemporary::Create(const ASTContext &C,
930                                    const CXXDestructorDecl *Destructor) {
931   return new (C) CXXTemporary(Destructor);
932 }
933 
934 CXXBindTemporaryExpr *CXXBindTemporaryExpr::Create(const ASTContext &C,
935                                                    CXXTemporary *Temp,
936                                                    Expr* SubExpr) {
937   assert((SubExpr->getType()->isRecordType() ||
938           SubExpr->getType()->isArrayType()) &&
939          "Expression bound to a temporary must have record or array type!");
940 
941   return new (C) CXXBindTemporaryExpr(Temp, SubExpr);
942 }
943 
944 CXXTemporaryObjectExpr::CXXTemporaryObjectExpr(
945     CXXConstructorDecl *Cons, QualType Ty, TypeSourceInfo *TSI,
946     ArrayRef<Expr *> Args, SourceRange ParenOrBraceRange,
947     bool HadMultipleCandidates, bool ListInitialization,
948     bool StdInitListInitialization, bool ZeroInitialization)
949     : CXXConstructExpr(
950           CXXTemporaryObjectExprClass, Ty, TSI->getTypeLoc().getBeginLoc(),
951           Cons, /* Elidable=*/false, Args, HadMultipleCandidates,
952           ListInitialization, StdInitListInitialization, ZeroInitialization,
953           CXXConstructExpr::CK_Complete, ParenOrBraceRange),
954       TSI(TSI) {}
955 
956 CXXTemporaryObjectExpr::CXXTemporaryObjectExpr(EmptyShell Empty,
957                                                unsigned NumArgs)
958     : CXXConstructExpr(CXXTemporaryObjectExprClass, Empty, NumArgs) {}
959 
960 CXXTemporaryObjectExpr *CXXTemporaryObjectExpr::Create(
961     const ASTContext &Ctx, CXXConstructorDecl *Cons, QualType Ty,
962     TypeSourceInfo *TSI, ArrayRef<Expr *> Args, SourceRange ParenOrBraceRange,
963     bool HadMultipleCandidates, bool ListInitialization,
964     bool StdInitListInitialization, bool ZeroInitialization) {
965   unsigned SizeOfTrailingObjects = sizeOfTrailingObjects(Args.size());
966   void *Mem =
967       Ctx.Allocate(sizeof(CXXTemporaryObjectExpr) + SizeOfTrailingObjects,
968                    alignof(CXXTemporaryObjectExpr));
969   return new (Mem) CXXTemporaryObjectExpr(
970       Cons, Ty, TSI, Args, ParenOrBraceRange, HadMultipleCandidates,
971       ListInitialization, StdInitListInitialization, ZeroInitialization);
972 }
973 
974 CXXTemporaryObjectExpr *
975 CXXTemporaryObjectExpr::CreateEmpty(const ASTContext &Ctx, unsigned NumArgs) {
976   unsigned SizeOfTrailingObjects = sizeOfTrailingObjects(NumArgs);
977   void *Mem =
978       Ctx.Allocate(sizeof(CXXTemporaryObjectExpr) + SizeOfTrailingObjects,
979                    alignof(CXXTemporaryObjectExpr));
980   return new (Mem) CXXTemporaryObjectExpr(EmptyShell(), NumArgs);
981 }
982 
983 SourceLocation CXXTemporaryObjectExpr::getBeginLoc() const {
984   return getTypeSourceInfo()->getTypeLoc().getBeginLoc();
985 }
986 
987 SourceLocation CXXTemporaryObjectExpr::getEndLoc() const {
988   SourceLocation Loc = getParenOrBraceRange().getEnd();
989   if (Loc.isInvalid() && getNumArgs())
990     Loc = getArg(getNumArgs() - 1)->getEndLoc();
991   return Loc;
992 }
993 
994 CXXConstructExpr *CXXConstructExpr::Create(
995     const ASTContext &Ctx, QualType Ty, SourceLocation Loc,
996     CXXConstructorDecl *Ctor, bool Elidable, ArrayRef<Expr *> Args,
997     bool HadMultipleCandidates, bool ListInitialization,
998     bool StdInitListInitialization, bool ZeroInitialization,
999     ConstructionKind ConstructKind, SourceRange ParenOrBraceRange) {
1000   unsigned SizeOfTrailingObjects = sizeOfTrailingObjects(Args.size());
1001   void *Mem = Ctx.Allocate(sizeof(CXXConstructExpr) + SizeOfTrailingObjects,
1002                            alignof(CXXConstructExpr));
1003   return new (Mem) CXXConstructExpr(
1004       CXXConstructExprClass, Ty, Loc, Ctor, Elidable, Args,
1005       HadMultipleCandidates, ListInitialization, StdInitListInitialization,
1006       ZeroInitialization, ConstructKind, ParenOrBraceRange);
1007 }
1008 
1009 CXXConstructExpr *CXXConstructExpr::CreateEmpty(const ASTContext &Ctx,
1010                                                 unsigned NumArgs) {
1011   unsigned SizeOfTrailingObjects = sizeOfTrailingObjects(NumArgs);
1012   void *Mem = Ctx.Allocate(sizeof(CXXConstructExpr) + SizeOfTrailingObjects,
1013                            alignof(CXXConstructExpr));
1014   return new (Mem)
1015       CXXConstructExpr(CXXConstructExprClass, EmptyShell(), NumArgs);
1016 }
1017 
1018 CXXConstructExpr::CXXConstructExpr(
1019     StmtClass SC, QualType Ty, SourceLocation Loc, CXXConstructorDecl *Ctor,
1020     bool Elidable, ArrayRef<Expr *> Args, bool HadMultipleCandidates,
1021     bool ListInitialization, bool StdInitListInitialization,
1022     bool ZeroInitialization, ConstructionKind ConstructKind,
1023     SourceRange ParenOrBraceRange)
1024     : Expr(SC, Ty, VK_RValue, OK_Ordinary, Ty->isDependentType(),
1025            Ty->isDependentType(), Ty->isInstantiationDependentType(),
1026            Ty->containsUnexpandedParameterPack()),
1027       Constructor(Ctor), ParenOrBraceRange(ParenOrBraceRange),
1028       NumArgs(Args.size()) {
1029   CXXConstructExprBits.Elidable = Elidable;
1030   CXXConstructExprBits.HadMultipleCandidates = HadMultipleCandidates;
1031   CXXConstructExprBits.ListInitialization = ListInitialization;
1032   CXXConstructExprBits.StdInitListInitialization = StdInitListInitialization;
1033   CXXConstructExprBits.ZeroInitialization = ZeroInitialization;
1034   CXXConstructExprBits.ConstructionKind = ConstructKind;
1035   CXXConstructExprBits.Loc = Loc;
1036 
1037   Stmt **TrailingArgs = getTrailingArgs();
1038   for (unsigned I = 0, N = Args.size(); I != N; ++I) {
1039     assert(Args[I] && "NULL argument in CXXConstructExpr!");
1040 
1041     if (Args[I]->isValueDependent())
1042       ExprBits.ValueDependent = true;
1043     if (Args[I]->isInstantiationDependent())
1044       ExprBits.InstantiationDependent = true;
1045     if (Args[I]->containsUnexpandedParameterPack())
1046       ExprBits.ContainsUnexpandedParameterPack = true;
1047 
1048     TrailingArgs[I] = Args[I];
1049   }
1050 }
1051 
1052 CXXConstructExpr::CXXConstructExpr(StmtClass SC, EmptyShell Empty,
1053                                    unsigned NumArgs)
1054     : Expr(SC, Empty), NumArgs(NumArgs) {}
1055 
1056 LambdaCapture::LambdaCapture(SourceLocation Loc, bool Implicit,
1057                              LambdaCaptureKind Kind, VarDecl *Var,
1058                              SourceLocation EllipsisLoc)
1059     : DeclAndBits(Var, 0), Loc(Loc), EllipsisLoc(EllipsisLoc) {
1060   unsigned Bits = 0;
1061   if (Implicit)
1062     Bits |= Capture_Implicit;
1063 
1064   switch (Kind) {
1065   case LCK_StarThis:
1066     Bits |= Capture_ByCopy;
1067     LLVM_FALLTHROUGH;
1068   case LCK_This:
1069     assert(!Var && "'this' capture cannot have a variable!");
1070     Bits |= Capture_This;
1071     break;
1072 
1073   case LCK_ByCopy:
1074     Bits |= Capture_ByCopy;
1075     LLVM_FALLTHROUGH;
1076   case LCK_ByRef:
1077     assert(Var && "capture must have a variable!");
1078     break;
1079   case LCK_VLAType:
1080     assert(!Var && "VLA type capture cannot have a variable!");
1081     break;
1082   }
1083   DeclAndBits.setInt(Bits);
1084 }
1085 
1086 LambdaCaptureKind LambdaCapture::getCaptureKind() const {
1087   if (capturesVLAType())
1088     return LCK_VLAType;
1089   bool CapByCopy = DeclAndBits.getInt() & Capture_ByCopy;
1090   if (capturesThis())
1091     return CapByCopy ? LCK_StarThis : LCK_This;
1092   return CapByCopy ? LCK_ByCopy : LCK_ByRef;
1093 }
1094 
1095 LambdaExpr::LambdaExpr(QualType T, SourceRange IntroducerRange,
1096                        LambdaCaptureDefault CaptureDefault,
1097                        SourceLocation CaptureDefaultLoc,
1098                        ArrayRef<LambdaCapture> Captures, bool ExplicitParams,
1099                        bool ExplicitResultType, ArrayRef<Expr *> CaptureInits,
1100                        SourceLocation ClosingBrace,
1101                        bool ContainsUnexpandedParameterPack)
1102     : Expr(LambdaExprClass, T, VK_RValue, OK_Ordinary, T->isDependentType(),
1103            T->isDependentType(), T->isDependentType(),
1104            ContainsUnexpandedParameterPack),
1105       IntroducerRange(IntroducerRange), CaptureDefaultLoc(CaptureDefaultLoc),
1106       NumCaptures(Captures.size()), CaptureDefault(CaptureDefault),
1107       ExplicitParams(ExplicitParams), ExplicitResultType(ExplicitResultType),
1108       ClosingBrace(ClosingBrace) {
1109   assert(CaptureInits.size() == Captures.size() && "Wrong number of arguments");
1110   CXXRecordDecl *Class = getLambdaClass();
1111   CXXRecordDecl::LambdaDefinitionData &Data = Class->getLambdaData();
1112 
1113   // FIXME: Propagate "has unexpanded parameter pack" bit.
1114 
1115   // Copy captures.
1116   const ASTContext &Context = Class->getASTContext();
1117   Data.NumCaptures = NumCaptures;
1118   Data.NumExplicitCaptures = 0;
1119   Data.Captures =
1120       (LambdaCapture *)Context.Allocate(sizeof(LambdaCapture) * NumCaptures);
1121   LambdaCapture *ToCapture = Data.Captures;
1122   for (unsigned I = 0, N = Captures.size(); I != N; ++I) {
1123     if (Captures[I].isExplicit())
1124       ++Data.NumExplicitCaptures;
1125 
1126     *ToCapture++ = Captures[I];
1127   }
1128 
1129   // Copy initialization expressions for the non-static data members.
1130   Stmt **Stored = getStoredStmts();
1131   for (unsigned I = 0, N = CaptureInits.size(); I != N; ++I)
1132     *Stored++ = CaptureInits[I];
1133 
1134   // Copy the body of the lambda.
1135   *Stored++ = getCallOperator()->getBody();
1136 }
1137 
1138 LambdaExpr *LambdaExpr::Create(
1139     const ASTContext &Context, CXXRecordDecl *Class,
1140     SourceRange IntroducerRange, LambdaCaptureDefault CaptureDefault,
1141     SourceLocation CaptureDefaultLoc, ArrayRef<LambdaCapture> Captures,
1142     bool ExplicitParams, bool ExplicitResultType, ArrayRef<Expr *> CaptureInits,
1143     SourceLocation ClosingBrace, bool ContainsUnexpandedParameterPack) {
1144   // Determine the type of the expression (i.e., the type of the
1145   // function object we're creating).
1146   QualType T = Context.getTypeDeclType(Class);
1147 
1148   unsigned Size = totalSizeToAlloc<Stmt *>(Captures.size() + 1);
1149   void *Mem = Context.Allocate(Size);
1150   return new (Mem)
1151       LambdaExpr(T, IntroducerRange, CaptureDefault, CaptureDefaultLoc,
1152                  Captures, ExplicitParams, ExplicitResultType, CaptureInits,
1153                  ClosingBrace, ContainsUnexpandedParameterPack);
1154 }
1155 
1156 LambdaExpr *LambdaExpr::CreateDeserialized(const ASTContext &C,
1157                                            unsigned NumCaptures) {
1158   unsigned Size = totalSizeToAlloc<Stmt *>(NumCaptures + 1);
1159   void *Mem = C.Allocate(Size);
1160   return new (Mem) LambdaExpr(EmptyShell(), NumCaptures);
1161 }
1162 
1163 bool LambdaExpr::isInitCapture(const LambdaCapture *C) const {
1164   return (C->capturesVariable() && C->getCapturedVar()->isInitCapture() &&
1165           (getCallOperator() == C->getCapturedVar()->getDeclContext()));
1166 }
1167 
1168 LambdaExpr::capture_iterator LambdaExpr::capture_begin() const {
1169   return getLambdaClass()->getLambdaData().Captures;
1170 }
1171 
1172 LambdaExpr::capture_iterator LambdaExpr::capture_end() const {
1173   return capture_begin() + NumCaptures;
1174 }
1175 
1176 LambdaExpr::capture_range LambdaExpr::captures() const {
1177   return capture_range(capture_begin(), capture_end());
1178 }
1179 
1180 LambdaExpr::capture_iterator LambdaExpr::explicit_capture_begin() const {
1181   return capture_begin();
1182 }
1183 
1184 LambdaExpr::capture_iterator LambdaExpr::explicit_capture_end() const {
1185   struct CXXRecordDecl::LambdaDefinitionData &Data
1186     = getLambdaClass()->getLambdaData();
1187   return Data.Captures + Data.NumExplicitCaptures;
1188 }
1189 
1190 LambdaExpr::capture_range LambdaExpr::explicit_captures() const {
1191   return capture_range(explicit_capture_begin(), explicit_capture_end());
1192 }
1193 
1194 LambdaExpr::capture_iterator LambdaExpr::implicit_capture_begin() const {
1195   return explicit_capture_end();
1196 }
1197 
1198 LambdaExpr::capture_iterator LambdaExpr::implicit_capture_end() const {
1199   return capture_end();
1200 }
1201 
1202 LambdaExpr::capture_range LambdaExpr::implicit_captures() const {
1203   return capture_range(implicit_capture_begin(), implicit_capture_end());
1204 }
1205 
1206 CXXRecordDecl *LambdaExpr::getLambdaClass() const {
1207   return getType()->getAsCXXRecordDecl();
1208 }
1209 
1210 CXXMethodDecl *LambdaExpr::getCallOperator() const {
1211   CXXRecordDecl *Record = getLambdaClass();
1212   return Record->getLambdaCallOperator();
1213 }
1214 
1215 TemplateParameterList *LambdaExpr::getTemplateParameterList() const {
1216   CXXRecordDecl *Record = getLambdaClass();
1217   return Record->getGenericLambdaTemplateParameterList();
1218 }
1219 
1220 ArrayRef<NamedDecl *> LambdaExpr::getExplicitTemplateParameters() const {
1221   const CXXRecordDecl *Record = getLambdaClass();
1222   return Record->getLambdaExplicitTemplateParameters();
1223 }
1224 
1225 CompoundStmt *LambdaExpr::getBody() const {
1226   // FIXME: this mutation in getBody is bogus. It should be
1227   // initialized in ASTStmtReader::VisitLambdaExpr, but for reasons I
1228   // don't understand, that doesn't work.
1229   if (!getStoredStmts()[NumCaptures])
1230     *const_cast<Stmt **>(&getStoredStmts()[NumCaptures]) =
1231         getCallOperator()->getBody();
1232 
1233   return static_cast<CompoundStmt *>(getStoredStmts()[NumCaptures]);
1234 }
1235 
1236 bool LambdaExpr::isMutable() const {
1237   return !getCallOperator()->isConst();
1238 }
1239 
1240 ExprWithCleanups::ExprWithCleanups(Expr *subexpr,
1241                                    bool CleanupsHaveSideEffects,
1242                                    ArrayRef<CleanupObject> objects)
1243     : FullExpr(ExprWithCleanupsClass, subexpr) {
1244   ExprWithCleanupsBits.CleanupsHaveSideEffects = CleanupsHaveSideEffects;
1245   ExprWithCleanupsBits.NumObjects = objects.size();
1246   for (unsigned i = 0, e = objects.size(); i != e; ++i)
1247     getTrailingObjects<CleanupObject>()[i] = objects[i];
1248 }
1249 
1250 ExprWithCleanups *ExprWithCleanups::Create(const ASTContext &C, Expr *subexpr,
1251                                            bool CleanupsHaveSideEffects,
1252                                            ArrayRef<CleanupObject> objects) {
1253   void *buffer = C.Allocate(totalSizeToAlloc<CleanupObject>(objects.size()),
1254                             alignof(ExprWithCleanups));
1255   return new (buffer)
1256       ExprWithCleanups(subexpr, CleanupsHaveSideEffects, objects);
1257 }
1258 
1259 ExprWithCleanups::ExprWithCleanups(EmptyShell empty, unsigned numObjects)
1260     : FullExpr(ExprWithCleanupsClass, empty) {
1261   ExprWithCleanupsBits.NumObjects = numObjects;
1262 }
1263 
1264 ExprWithCleanups *ExprWithCleanups::Create(const ASTContext &C,
1265                                            EmptyShell empty,
1266                                            unsigned numObjects) {
1267   void *buffer = C.Allocate(totalSizeToAlloc<CleanupObject>(numObjects),
1268                             alignof(ExprWithCleanups));
1269   return new (buffer) ExprWithCleanups(empty, numObjects);
1270 }
1271 
1272 CXXUnresolvedConstructExpr::CXXUnresolvedConstructExpr(TypeSourceInfo *TSI,
1273                                                        SourceLocation LParenLoc,
1274                                                        ArrayRef<Expr *> Args,
1275                                                        SourceLocation RParenLoc)
1276     : Expr(CXXUnresolvedConstructExprClass,
1277            TSI->getType().getNonReferenceType(),
1278            (TSI->getType()->isLValueReferenceType()
1279                 ? VK_LValue
1280                 : TSI->getType()->isRValueReferenceType() ? VK_XValue
1281                                                           : VK_RValue),
1282            OK_Ordinary,
1283            TSI->getType()->isDependentType() ||
1284                TSI->getType()->getContainedDeducedType(),
1285            true, true, TSI->getType()->containsUnexpandedParameterPack()),
1286       TSI(TSI), LParenLoc(LParenLoc), RParenLoc(RParenLoc) {
1287   CXXUnresolvedConstructExprBits.NumArgs = Args.size();
1288   auto **StoredArgs = getTrailingObjects<Expr *>();
1289   for (unsigned I = 0; I != Args.size(); ++I) {
1290     if (Args[I]->containsUnexpandedParameterPack())
1291       ExprBits.ContainsUnexpandedParameterPack = true;
1292 
1293     StoredArgs[I] = Args[I];
1294   }
1295 }
1296 
1297 CXXUnresolvedConstructExpr *CXXUnresolvedConstructExpr::Create(
1298     const ASTContext &Context, TypeSourceInfo *TSI, SourceLocation LParenLoc,
1299     ArrayRef<Expr *> Args, SourceLocation RParenLoc) {
1300   void *Mem = Context.Allocate(totalSizeToAlloc<Expr *>(Args.size()));
1301   return new (Mem) CXXUnresolvedConstructExpr(TSI, LParenLoc, Args, RParenLoc);
1302 }
1303 
1304 CXXUnresolvedConstructExpr *
1305 CXXUnresolvedConstructExpr::CreateEmpty(const ASTContext &Context,
1306                                         unsigned NumArgs) {
1307   void *Mem = Context.Allocate(totalSizeToAlloc<Expr *>(NumArgs));
1308   return new (Mem) CXXUnresolvedConstructExpr(EmptyShell(), NumArgs);
1309 }
1310 
1311 SourceLocation CXXUnresolvedConstructExpr::getBeginLoc() const {
1312   return TSI->getTypeLoc().getBeginLoc();
1313 }
1314 
1315 CXXDependentScopeMemberExpr::CXXDependentScopeMemberExpr(
1316     const ASTContext &Ctx, Expr *Base, QualType BaseType, bool IsArrow,
1317     SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc,
1318     SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierFoundInScope,
1319     DeclarationNameInfo MemberNameInfo,
1320     const TemplateArgumentListInfo *TemplateArgs)
1321     : Expr(CXXDependentScopeMemberExprClass, Ctx.DependentTy, VK_LValue,
1322            OK_Ordinary, true, true, true,
1323            ((Base && Base->containsUnexpandedParameterPack()) ||
1324             (QualifierLoc && QualifierLoc.getNestedNameSpecifier()
1325                                  ->containsUnexpandedParameterPack()) ||
1326             MemberNameInfo.containsUnexpandedParameterPack())),
1327       Base(Base), BaseType(BaseType), QualifierLoc(QualifierLoc),
1328       MemberNameInfo(MemberNameInfo) {
1329   CXXDependentScopeMemberExprBits.IsArrow = IsArrow;
1330   CXXDependentScopeMemberExprBits.HasTemplateKWAndArgsInfo =
1331       (TemplateArgs != nullptr) || TemplateKWLoc.isValid();
1332   CXXDependentScopeMemberExprBits.HasFirstQualifierFoundInScope =
1333       FirstQualifierFoundInScope != nullptr;
1334   CXXDependentScopeMemberExprBits.OperatorLoc = OperatorLoc;
1335 
1336   if (TemplateArgs) {
1337     bool Dependent = true;
1338     bool InstantiationDependent = true;
1339     bool ContainsUnexpandedParameterPack = false;
1340     getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1341         TemplateKWLoc, *TemplateArgs, getTrailingObjects<TemplateArgumentLoc>(),
1342         Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
1343     if (ContainsUnexpandedParameterPack)
1344       ExprBits.ContainsUnexpandedParameterPack = true;
1345   } else if (TemplateKWLoc.isValid()) {
1346     getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1347         TemplateKWLoc);
1348   }
1349 
1350   if (hasFirstQualifierFoundInScope())
1351     *getTrailingObjects<NamedDecl *>() = FirstQualifierFoundInScope;
1352 }
1353 
1354 CXXDependentScopeMemberExpr::CXXDependentScopeMemberExpr(
1355     EmptyShell Empty, bool HasTemplateKWAndArgsInfo,
1356     bool HasFirstQualifierFoundInScope)
1357     : Expr(CXXDependentScopeMemberExprClass, Empty) {
1358   CXXDependentScopeMemberExprBits.HasTemplateKWAndArgsInfo =
1359       HasTemplateKWAndArgsInfo;
1360   CXXDependentScopeMemberExprBits.HasFirstQualifierFoundInScope =
1361       HasFirstQualifierFoundInScope;
1362 }
1363 
1364 CXXDependentScopeMemberExpr *CXXDependentScopeMemberExpr::Create(
1365     const ASTContext &Ctx, Expr *Base, QualType BaseType, bool IsArrow,
1366     SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc,
1367     SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierFoundInScope,
1368     DeclarationNameInfo MemberNameInfo,
1369     const TemplateArgumentListInfo *TemplateArgs) {
1370   bool HasTemplateKWAndArgsInfo =
1371       (TemplateArgs != nullptr) || TemplateKWLoc.isValid();
1372   unsigned NumTemplateArgs = TemplateArgs ? TemplateArgs->size() : 0;
1373   bool HasFirstQualifierFoundInScope = FirstQualifierFoundInScope != nullptr;
1374 
1375   unsigned Size = totalSizeToAlloc<ASTTemplateKWAndArgsInfo,
1376                                    TemplateArgumentLoc, NamedDecl *>(
1377       HasTemplateKWAndArgsInfo, NumTemplateArgs, HasFirstQualifierFoundInScope);
1378 
1379   void *Mem = Ctx.Allocate(Size, alignof(CXXDependentScopeMemberExpr));
1380   return new (Mem) CXXDependentScopeMemberExpr(
1381       Ctx, Base, BaseType, IsArrow, OperatorLoc, QualifierLoc, TemplateKWLoc,
1382       FirstQualifierFoundInScope, MemberNameInfo, TemplateArgs);
1383 }
1384 
1385 CXXDependentScopeMemberExpr *CXXDependentScopeMemberExpr::CreateEmpty(
1386     const ASTContext &Ctx, bool HasTemplateKWAndArgsInfo,
1387     unsigned NumTemplateArgs, bool HasFirstQualifierFoundInScope) {
1388   assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
1389 
1390   unsigned Size = totalSizeToAlloc<ASTTemplateKWAndArgsInfo,
1391                                    TemplateArgumentLoc, NamedDecl *>(
1392       HasTemplateKWAndArgsInfo, NumTemplateArgs, HasFirstQualifierFoundInScope);
1393 
1394   void *Mem = Ctx.Allocate(Size, alignof(CXXDependentScopeMemberExpr));
1395   return new (Mem) CXXDependentScopeMemberExpr(
1396       EmptyShell(), HasTemplateKWAndArgsInfo, HasFirstQualifierFoundInScope);
1397 }
1398 
1399 static bool hasOnlyNonStaticMemberFunctions(UnresolvedSetIterator begin,
1400                                             UnresolvedSetIterator end) {
1401   do {
1402     NamedDecl *decl = *begin;
1403     if (isa<UnresolvedUsingValueDecl>(decl))
1404       return false;
1405 
1406     // Unresolved member expressions should only contain methods and
1407     // method templates.
1408     if (cast<CXXMethodDecl>(decl->getUnderlyingDecl()->getAsFunction())
1409             ->isStatic())
1410       return false;
1411   } while (++begin != end);
1412 
1413   return true;
1414 }
1415 
1416 UnresolvedMemberExpr::UnresolvedMemberExpr(
1417     const ASTContext &Context, bool HasUnresolvedUsing, Expr *Base,
1418     QualType BaseType, bool IsArrow, SourceLocation OperatorLoc,
1419     NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
1420     const DeclarationNameInfo &MemberNameInfo,
1421     const TemplateArgumentListInfo *TemplateArgs, UnresolvedSetIterator Begin,
1422     UnresolvedSetIterator End)
1423     : OverloadExpr(
1424           UnresolvedMemberExprClass, Context, QualifierLoc, TemplateKWLoc,
1425           MemberNameInfo, TemplateArgs, Begin, End,
1426           // Dependent
1427           ((Base && Base->isTypeDependent()) || BaseType->isDependentType()),
1428           ((Base && Base->isInstantiationDependent()) ||
1429            BaseType->isInstantiationDependentType()),
1430           // Contains unexpanded parameter pack
1431           ((Base && Base->containsUnexpandedParameterPack()) ||
1432            BaseType->containsUnexpandedParameterPack())),
1433       Base(Base), BaseType(BaseType), OperatorLoc(OperatorLoc) {
1434   UnresolvedMemberExprBits.IsArrow = IsArrow;
1435   UnresolvedMemberExprBits.HasUnresolvedUsing = HasUnresolvedUsing;
1436 
1437   // Check whether all of the members are non-static member functions,
1438   // and if so, mark give this bound-member type instead of overload type.
1439   if (hasOnlyNonStaticMemberFunctions(Begin, End))
1440     setType(Context.BoundMemberTy);
1441 }
1442 
1443 UnresolvedMemberExpr::UnresolvedMemberExpr(EmptyShell Empty,
1444                                            unsigned NumResults,
1445                                            bool HasTemplateKWAndArgsInfo)
1446     : OverloadExpr(UnresolvedMemberExprClass, Empty, NumResults,
1447                    HasTemplateKWAndArgsInfo) {}
1448 
1449 bool UnresolvedMemberExpr::isImplicitAccess() const {
1450   if (!Base)
1451     return true;
1452 
1453   return cast<Expr>(Base)->isImplicitCXXThis();
1454 }
1455 
1456 UnresolvedMemberExpr *UnresolvedMemberExpr::Create(
1457     const ASTContext &Context, bool HasUnresolvedUsing, Expr *Base,
1458     QualType BaseType, bool IsArrow, SourceLocation OperatorLoc,
1459     NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
1460     const DeclarationNameInfo &MemberNameInfo,
1461     const TemplateArgumentListInfo *TemplateArgs, UnresolvedSetIterator Begin,
1462     UnresolvedSetIterator End) {
1463   unsigned NumResults = End - Begin;
1464   bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
1465   unsigned NumTemplateArgs = TemplateArgs ? TemplateArgs->size() : 0;
1466   unsigned Size = totalSizeToAlloc<DeclAccessPair, ASTTemplateKWAndArgsInfo,
1467                                    TemplateArgumentLoc>(
1468       NumResults, HasTemplateKWAndArgsInfo, NumTemplateArgs);
1469   void *Mem = Context.Allocate(Size, alignof(UnresolvedMemberExpr));
1470   return new (Mem) UnresolvedMemberExpr(
1471       Context, HasUnresolvedUsing, Base, BaseType, IsArrow, OperatorLoc,
1472       QualifierLoc, TemplateKWLoc, MemberNameInfo, TemplateArgs, Begin, End);
1473 }
1474 
1475 UnresolvedMemberExpr *UnresolvedMemberExpr::CreateEmpty(
1476     const ASTContext &Context, unsigned NumResults,
1477     bool HasTemplateKWAndArgsInfo, unsigned NumTemplateArgs) {
1478   assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
1479   unsigned Size = totalSizeToAlloc<DeclAccessPair, ASTTemplateKWAndArgsInfo,
1480                                    TemplateArgumentLoc>(
1481       NumResults, HasTemplateKWAndArgsInfo, NumTemplateArgs);
1482   void *Mem = Context.Allocate(Size, alignof(UnresolvedMemberExpr));
1483   return new (Mem)
1484       UnresolvedMemberExpr(EmptyShell(), NumResults, HasTemplateKWAndArgsInfo);
1485 }
1486 
1487 CXXRecordDecl *UnresolvedMemberExpr::getNamingClass() {
1488   // Unlike for UnresolvedLookupExpr, it is very easy to re-derive this.
1489 
1490   // If there was a nested name specifier, it names the naming class.
1491   // It can't be dependent: after all, we were actually able to do the
1492   // lookup.
1493   CXXRecordDecl *Record = nullptr;
1494   auto *NNS = getQualifier();
1495   if (NNS && NNS->getKind() != NestedNameSpecifier::Super) {
1496     const Type *T = getQualifier()->getAsType();
1497     assert(T && "qualifier in member expression does not name type");
1498     Record = T->getAsCXXRecordDecl();
1499     assert(Record && "qualifier in member expression does not name record");
1500   }
1501   // Otherwise the naming class must have been the base class.
1502   else {
1503     QualType BaseType = getBaseType().getNonReferenceType();
1504     if (isArrow()) {
1505       const auto *PT = BaseType->getAs<PointerType>();
1506       assert(PT && "base of arrow member access is not pointer");
1507       BaseType = PT->getPointeeType();
1508     }
1509 
1510     Record = BaseType->getAsCXXRecordDecl();
1511     assert(Record && "base of member expression does not name record");
1512   }
1513 
1514   return Record;
1515 }
1516 
1517 SizeOfPackExpr *
1518 SizeOfPackExpr::Create(ASTContext &Context, SourceLocation OperatorLoc,
1519                        NamedDecl *Pack, SourceLocation PackLoc,
1520                        SourceLocation RParenLoc,
1521                        Optional<unsigned> Length,
1522                        ArrayRef<TemplateArgument> PartialArgs) {
1523   void *Storage =
1524       Context.Allocate(totalSizeToAlloc<TemplateArgument>(PartialArgs.size()));
1525   return new (Storage) SizeOfPackExpr(Context.getSizeType(), OperatorLoc, Pack,
1526                                       PackLoc, RParenLoc, Length, PartialArgs);
1527 }
1528 
1529 SizeOfPackExpr *SizeOfPackExpr::CreateDeserialized(ASTContext &Context,
1530                                                    unsigned NumPartialArgs) {
1531   void *Storage =
1532       Context.Allocate(totalSizeToAlloc<TemplateArgument>(NumPartialArgs));
1533   return new (Storage) SizeOfPackExpr(EmptyShell(), NumPartialArgs);
1534 }
1535 
1536 SubstNonTypeTemplateParmPackExpr::
1537 SubstNonTypeTemplateParmPackExpr(QualType T,
1538                                  ExprValueKind ValueKind,
1539                                  NonTypeTemplateParmDecl *Param,
1540                                  SourceLocation NameLoc,
1541                                  const TemplateArgument &ArgPack)
1542     : Expr(SubstNonTypeTemplateParmPackExprClass, T, ValueKind, OK_Ordinary,
1543            true, true, true, true),
1544       Param(Param), Arguments(ArgPack.pack_begin()),
1545       NumArguments(ArgPack.pack_size()), NameLoc(NameLoc) {}
1546 
1547 TemplateArgument SubstNonTypeTemplateParmPackExpr::getArgumentPack() const {
1548   return TemplateArgument(llvm::makeArrayRef(Arguments, NumArguments));
1549 }
1550 
1551 FunctionParmPackExpr::FunctionParmPackExpr(QualType T, VarDecl *ParamPack,
1552                                            SourceLocation NameLoc,
1553                                            unsigned NumParams,
1554                                            VarDecl *const *Params)
1555     : Expr(FunctionParmPackExprClass, T, VK_LValue, OK_Ordinary, true, true,
1556            true, true),
1557       ParamPack(ParamPack), NameLoc(NameLoc), NumParameters(NumParams) {
1558   if (Params)
1559     std::uninitialized_copy(Params, Params + NumParams,
1560                             getTrailingObjects<VarDecl *>());
1561 }
1562 
1563 FunctionParmPackExpr *
1564 FunctionParmPackExpr::Create(const ASTContext &Context, QualType T,
1565                              VarDecl *ParamPack, SourceLocation NameLoc,
1566                              ArrayRef<VarDecl *> Params) {
1567   return new (Context.Allocate(totalSizeToAlloc<VarDecl *>(Params.size())))
1568       FunctionParmPackExpr(T, ParamPack, NameLoc, Params.size(), Params.data());
1569 }
1570 
1571 FunctionParmPackExpr *
1572 FunctionParmPackExpr::CreateEmpty(const ASTContext &Context,
1573                                   unsigned NumParams) {
1574   return new (Context.Allocate(totalSizeToAlloc<VarDecl *>(NumParams)))
1575       FunctionParmPackExpr(QualType(), nullptr, SourceLocation(), 0, nullptr);
1576 }
1577 
1578 void MaterializeTemporaryExpr::setExtendingDecl(const ValueDecl *ExtendedBy,
1579                                                 unsigned ManglingNumber) {
1580   // We only need extra state if we have to remember more than just the Stmt.
1581   if (!ExtendedBy)
1582     return;
1583 
1584   // We may need to allocate extra storage for the mangling number and the
1585   // extended-by ValueDecl.
1586   if (!State.is<ExtraState *>()) {
1587     auto *ES = new (ExtendedBy->getASTContext()) ExtraState;
1588     ES->Temporary = State.get<Stmt *>();
1589     State = ES;
1590   }
1591 
1592   auto ES = State.get<ExtraState *>();
1593   ES->ExtendingDecl = ExtendedBy;
1594   ES->ManglingNumber = ManglingNumber;
1595 }
1596 
1597 TypeTraitExpr::TypeTraitExpr(QualType T, SourceLocation Loc, TypeTrait Kind,
1598                              ArrayRef<TypeSourceInfo *> Args,
1599                              SourceLocation RParenLoc,
1600                              bool Value)
1601     : Expr(TypeTraitExprClass, T, VK_RValue, OK_Ordinary,
1602            /*TypeDependent=*/false,
1603            /*ValueDependent=*/false,
1604            /*InstantiationDependent=*/false,
1605            /*ContainsUnexpandedParameterPack=*/false),
1606       Loc(Loc), RParenLoc(RParenLoc) {
1607   TypeTraitExprBits.Kind = Kind;
1608   TypeTraitExprBits.Value = Value;
1609   TypeTraitExprBits.NumArgs = Args.size();
1610 
1611   auto **ToArgs = getTrailingObjects<TypeSourceInfo *>();
1612 
1613   for (unsigned I = 0, N = Args.size(); I != N; ++I) {
1614     if (Args[I]->getType()->isDependentType())
1615       setValueDependent(true);
1616     if (Args[I]->getType()->isInstantiationDependentType())
1617       setInstantiationDependent(true);
1618     if (Args[I]->getType()->containsUnexpandedParameterPack())
1619       setContainsUnexpandedParameterPack(true);
1620 
1621     ToArgs[I] = Args[I];
1622   }
1623 }
1624 
1625 TypeTraitExpr *TypeTraitExpr::Create(const ASTContext &C, QualType T,
1626                                      SourceLocation Loc,
1627                                      TypeTrait Kind,
1628                                      ArrayRef<TypeSourceInfo *> Args,
1629                                      SourceLocation RParenLoc,
1630                                      bool Value) {
1631   void *Mem = C.Allocate(totalSizeToAlloc<TypeSourceInfo *>(Args.size()));
1632   return new (Mem) TypeTraitExpr(T, Loc, Kind, Args, RParenLoc, Value);
1633 }
1634 
1635 TypeTraitExpr *TypeTraitExpr::CreateDeserialized(const ASTContext &C,
1636                                                  unsigned NumArgs) {
1637   void *Mem = C.Allocate(totalSizeToAlloc<TypeSourceInfo *>(NumArgs));
1638   return new (Mem) TypeTraitExpr(EmptyShell());
1639 }
1640 
1641 CUDAKernelCallExpr::CUDAKernelCallExpr(Expr *Fn, CallExpr *Config,
1642                                        ArrayRef<Expr *> Args, QualType Ty,
1643                                        ExprValueKind VK, SourceLocation RP,
1644                                        unsigned MinNumArgs)
1645     : CallExpr(CUDAKernelCallExprClass, Fn, /*PreArgs=*/Config, Args, Ty, VK,
1646                RP, MinNumArgs, NotADL) {}
1647 
1648 CUDAKernelCallExpr::CUDAKernelCallExpr(unsigned NumArgs, EmptyShell Empty)
1649     : CallExpr(CUDAKernelCallExprClass, /*NumPreArgs=*/END_PREARG, NumArgs,
1650                Empty) {}
1651 
1652 CUDAKernelCallExpr *
1653 CUDAKernelCallExpr::Create(const ASTContext &Ctx, Expr *Fn, CallExpr *Config,
1654                            ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
1655                            SourceLocation RP, unsigned MinNumArgs) {
1656   // Allocate storage for the trailing objects of CallExpr.
1657   unsigned NumArgs = std::max<unsigned>(Args.size(), MinNumArgs);
1658   unsigned SizeOfTrailingObjects =
1659       CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/END_PREARG, NumArgs);
1660   void *Mem = Ctx.Allocate(sizeof(CUDAKernelCallExpr) + SizeOfTrailingObjects,
1661                            alignof(CUDAKernelCallExpr));
1662   return new (Mem) CUDAKernelCallExpr(Fn, Config, Args, Ty, VK, RP, MinNumArgs);
1663 }
1664 
1665 CUDAKernelCallExpr *CUDAKernelCallExpr::CreateEmpty(const ASTContext &Ctx,
1666                                                     unsigned NumArgs,
1667                                                     EmptyShell Empty) {
1668   // Allocate storage for the trailing objects of CallExpr.
1669   unsigned SizeOfTrailingObjects =
1670       CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/END_PREARG, NumArgs);
1671   void *Mem = Ctx.Allocate(sizeof(CUDAKernelCallExpr) + SizeOfTrailingObjects,
1672                            alignof(CUDAKernelCallExpr));
1673   return new (Mem) CUDAKernelCallExpr(NumArgs, Empty);
1674 }
1675