clang/lib/Sema/TreeTransform.h

//===------- TreeTransform.h - Semantic Tree Transformation -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//===----------------------------------------------------------------------===//
//
//  This file implements a semantic tree transformation that takes a given
//  AST and rebuilds it, possibly transforming some nodes in the process.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_LIB_SEMA_TREETRANSFORM_H
#define LLVM_CLANG_LIB_SEMA_TREETRANSFORM_H

#include "CoroutineStmtBuilder.h"
#include "TypeLocBuilder.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprConcepts.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/ExprOpenMP.h"
#include "clang/AST/OpenMPClause.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtCXX.h"
#include "clang/AST/StmtObjC.h"
#include "clang/AST/StmtOpenMP.h"
#include "clang/Basic/DiagnosticParse.h"
#include "clang/Basic/OpenMPKinds.h"
#include "clang/Sema/Designator.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Ownership.h"
#include "clang/Sema/ParsedTemplate.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/SemaDiagnostic.h"
#include "clang/Sema/SemaInternal.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/ErrorHandling.h"
#include <algorithm>

using namespace llvm::omp;

namespace clang {
using namespace sema;

/// A semantic tree transformation that allows one to transform one
/// abstract syntax tree into another.
///
/// A new tree transformation is defined by creating a new subclass \c X of
/// \c TreeTransform<X> and then overriding certain operations to provide
/// behavior specific to that transformation. For example, template
/// instantiation is implemented as a tree transformation where the
/// transformation of TemplateTypeParmType nodes involves substituting the
/// template arguments for their corresponding template parameters; a similar
/// transformation is performed for non-type template parameters and
/// template template parameters.
///
/// This tree-transformation template uses static polymorphism to allow
/// subclasses to customize any of its operations. Thus, a subclass can
/// override any of the transformation or rebuild operators by providing an
/// operation with the same signature as the default implementation. The
/// overriding function should not be virtual.
///
/// Semantic tree transformations are split into two stages, either of which
/// can be replaced by a subclass. The "transform" step transforms an AST node
/// or the parts of an AST node using the various transformation functions,
/// then passes the pieces on to the "rebuild" step, which constructs a new AST
/// node of the appropriate kind from the pieces. The default transformation
/// routines recursively transform the operands to composite AST nodes (e.g.,
/// the pointee type of a PointerType node) and, if any of those operand nodes
/// were changed by the transformation, invokes the rebuild operation to create
/// a new AST node.
///
/// Subclasses can customize the transformation at various levels. The
/// most coarse-grained transformations involve replacing TransformType(),
/// TransformExpr(), TransformDecl(), TransformNestedNameSpecifierLoc(),
/// TransformTemplateName(), or TransformTemplateArgument() with entirely
/// new implementations.
///
/// For more fine-grained transformations, subclasses can replace any of the
/// \c TransformXXX functions (where XXX is the name of an AST node, e.g.,
/// PointerType, StmtExpr) to alter the transformation. As mentioned previously,
/// replacing TransformTemplateTypeParmType() allows template instantiation
/// to substitute template arguments for their corresponding template
/// parameters. Additionally, subclasses can override the \c RebuildXXX
/// functions to control how AST nodes are rebuilt when their operands change.
/// By default, \c TreeTransform will invoke semantic analysis to rebuild
/// AST nodes. However, certain other tree transformations (e.g, cloning) may
/// be able to use more efficient rebuild steps.
///
/// There are a handful of other functions that can be overridden, allowing one
/// to avoid traversing nodes that don't need any transformation
/// (\c AlreadyTransformed()), force rebuilding AST nodes even when their
/// operands have not changed (\c AlwaysRebuild()), and customize the
/// default locations and entity names used for type-checking
/// (\c getBaseLocation(), \c getBaseEntity()).
template<typename Derived>
class TreeTransform {
  /// Private RAII object that helps us forget and then re-remember
  /// the template argument corresponding to a partially-substituted parameter
  /// pack.
  class ForgetPartiallySubstitutedPackRAII {
    Derived &Self;
    TemplateArgument Old;

  public:
    ForgetPartiallySubstitutedPackRAII(Derived &Self) : Self(Self) {
      Old = Self.ForgetPartiallySubstitutedPack();
    }

    ~ForgetPartiallySubstitutedPackRAII() {
      Self.RememberPartiallySubstitutedPack(Old);
    }
  };

protected:
  Sema &SemaRef;

  /// The set of local declarations that have been transformed, for
  /// cases where we are forced to build new declarations within the transformer
  /// rather than in the subclass (e.g., lambda closure types).
  llvm::DenseMap<Decl *, Decl *> TransformedLocalDecls;

public:
  /// Initializes a new tree transformer.
  TreeTransform(Sema &SemaRef) : SemaRef(SemaRef) { }

  /// Retrieves a reference to the derived class.
  Derived &getDerived() { return static_cast<Derived&>(*this); }

  /// Retrieves a reference to the derived class.
  const Derived &getDerived() const {
    return static_cast<const Derived&>(*this);
  }

  static inline ExprResult Owned(Expr *E) { return E; }
  static inline StmtResult Owned(Stmt *S) { return S; }

  /// Retrieves a reference to the semantic analysis object used for
  /// this tree transform.
  Sema &getSema() const { return SemaRef; }

  /// Whether the transformation should always rebuild AST nodes, even
  /// if none of the children have changed.
  ///
  /// Subclasses may override this function to specify when the transformation
  /// should rebuild all AST nodes.
  ///
  /// We must always rebuild all AST nodes when performing variadic template
  /// pack expansion, in order to avoid violating the AST invariant that each
  /// statement node appears at most once in its containing declaration.
  bool AlwaysRebuild() { return SemaRef.ArgumentPackSubstitutionIndex != -1; }

  /// Whether the transformation is forming an expression or statement that
  /// replaces the original. In this case, we'll reuse mangling numbers from
  /// existing lambdas.
  bool ReplacingOriginal() { return false; }

  /// Wether CXXConstructExpr can be skipped when they are implicit.
  /// They will be reconstructed when used if needed.
  /// This is useful when the user that cause rebuilding of the
  /// CXXConstructExpr is outside of the expression at which the TreeTransform
  /// started.
  bool AllowSkippingCXXConstructExpr() { return true; }

  /// Returns the location of the entity being transformed, if that
  /// information was not available elsewhere in the AST.
  ///
  /// By default, returns no source-location information. Subclasses can
  /// provide an alternative implementation that provides better location
  /// information.
  SourceLocation getBaseLocation() { return SourceLocation(); }

  /// Returns the name of the entity being transformed, if that
  /// information was not available elsewhere in the AST.
  ///
  /// By default, returns an empty name. Subclasses can provide an alternative
  /// implementation with a more precise name.
  DeclarationName getBaseEntity() { return DeclarationName(); }

  /// Sets the "base" location and entity when that
  /// information is known based on another transformation.
  ///
  /// By default, the source location and entity are ignored. Subclasses can
  /// override this function to provide a customized implementation.
  void setBase(SourceLocation Loc, DeclarationName Entity) { }

  /// RAII object that temporarily sets the base location and entity
  /// used for reporting diagnostics in types.
  class TemporaryBase {
    TreeTransform &Self;
    SourceLocation OldLocation;
    DeclarationName OldEntity;

  public:
    TemporaryBase(TreeTransform &Self, SourceLocation Location,
                  DeclarationName Entity) : Self(Self) {
      OldLocation = Self.getDerived().getBaseLocation();
      OldEntity = Self.getDerived().getBaseEntity();

      if (Location.isValid())
        Self.getDerived().setBase(Location, Entity);
    }

    ~TemporaryBase() {
      Self.getDerived().setBase(OldLocation, OldEntity);
    }
  };

  /// Determine whether the given type \p T has already been
  /// transformed.
  ///
  /// Subclasses can provide an alternative implementation of this routine
  /// to short-circuit evaluation when it is known that a given type will
  /// not change. For example, template instantiation need not traverse
  /// non-dependent types.
  bool AlreadyTransformed(QualType T) {
    return T.isNull();
  }

  /// Transform a template parameter depth level.
  ///
  /// During a transformation that transforms template parameters, this maps
  /// an old template parameter depth to a new depth.
  unsigned TransformTemplateDepth(unsigned Depth) {
    return Depth;
  }

  /// Determine whether the given call argument should be dropped, e.g.,
  /// because it is a default argument.
  ///
  /// Subclasses can provide an alternative implementation of this routine to
  /// determine which kinds of call arguments get dropped. By default,
  /// CXXDefaultArgument nodes are dropped (prior to transformation).
  bool DropCallArgument(Expr *E) {
    return E->isDefaultArgument();
  }

  /// Determine whether we should expand a pack expansion with the
  /// given set of parameter packs into separate arguments by repeatedly
  /// transforming the pattern.
  ///
  /// By default, the transformer never tries to expand pack expansions.
  /// Subclasses can override this routine to provide different behavior.
  ///
  /// \param EllipsisLoc The location of the ellipsis that identifies the
  /// pack expansion.
  ///
  /// \param PatternRange The source range that covers the entire pattern of
  /// the pack expansion.
  ///
  /// \param Unexpanded The set of unexpanded parameter packs within the
  /// pattern.
  ///
  /// \param ShouldExpand Will be set to \c true if the transformer should
  /// expand the corresponding pack expansions into separate arguments. When
  /// set, \c NumExpansions must also be set.
  ///
  /// \param RetainExpansion Whether the caller should add an unexpanded
  /// pack expansion after all of the expanded arguments. This is used
  /// when extending explicitly-specified template argument packs per
  /// C++0x [temp.arg.explicit]p9.
  ///
  /// \param NumExpansions The number of separate arguments that will be in
  /// the expanded form of the corresponding pack expansion. This is both an
  /// input and an output parameter, which can be set by the caller if the
  /// number of expansions is known a priori (e.g., due to a prior substitution)
  /// and will be set by the callee when the number of expansions is known.
  /// The callee must set this value when \c ShouldExpand is \c true; it may
  /// set this value in other cases.
  ///
  /// \returns true if an error occurred (e.g., because the parameter packs
  /// are to be instantiated with arguments of different lengths), false
  /// otherwise. If false, \c ShouldExpand (and possibly \c NumExpansions)
  /// must be set.
  bool TryExpandParameterPacks(SourceLocation EllipsisLoc,
                               SourceRange PatternRange,
                               ArrayRef<UnexpandedParameterPack> Unexpanded,
                               bool &ShouldExpand,
                               bool &RetainExpansion,
                               Optional<unsigned> &NumExpansions) {
    ShouldExpand = false;
    return false;
  }

  /// "Forget" about the partially-substituted pack template argument,
  /// when performing an instantiation that must preserve the parameter pack
  /// use.
  ///
  /// This routine is meant to be overridden by the template instantiator.
  TemplateArgument ForgetPartiallySubstitutedPack() {
    return TemplateArgument();
  }

  /// "Remember" the partially-substituted pack template argument
  /// after performing an instantiation that must preserve the parameter pack
  /// use.
  ///
  /// This routine is meant to be overridden by the template instantiator.
  void RememberPartiallySubstitutedPack(TemplateArgument Arg) { }

  /// Note to the derived class when a function parameter pack is
  /// being expanded.
  void ExpandingFunctionParameterPack(ParmVarDecl *Pack) { }

  /// Transforms the given type into another type.
  ///
  /// By default, this routine transforms a type by creating a
  /// TypeSourceInfo for it and delegating to the appropriate
  /// function.  This is expensive, but we don't mind, because
  /// this method is deprecated anyway;  all users should be
  /// switched to storing TypeSourceInfos.
  ///
  /// \returns the transformed type.
  QualType TransformType(QualType T);

  /// Transforms the given type-with-location into a new
  /// type-with-location.
  ///
  /// By default, this routine transforms a type by delegating to the
  /// appropriate TransformXXXType to build a new type.  Subclasses
  /// may override this function (to take over all type
  /// transformations) or some set of the TransformXXXType functions
  /// to alter the transformation.
  TypeSourceInfo *TransformType(TypeSourceInfo *DI);

  /// Transform the given type-with-location into a new
  /// type, collecting location information in the given builder
  /// as necessary.
  ///
  QualType TransformType(TypeLocBuilder &TLB, TypeLoc TL);

  /// Transform a type that is permitted to produce a
  /// DeducedTemplateSpecializationType.
  ///
  /// This is used in the (relatively rare) contexts where it is acceptable
  /// for transformation to produce a class template type with deduced
  /// template arguments.
  /// @{
  QualType TransformTypeWithDeducedTST(QualType T);
  TypeSourceInfo *TransformTypeWithDeducedTST(TypeSourceInfo *DI);
  /// @}

  /// The reason why the value of a statement is not discarded, if any.
  enum StmtDiscardKind {
    SDK_Discarded,
    SDK_NotDiscarded,
    SDK_StmtExprResult,
  };

  /// Transform the given statement.
  ///
  /// By default, this routine transforms a statement by delegating to the
  /// appropriate TransformXXXStmt function to transform a specific kind of
  /// statement or the TransformExpr() function to transform an expression.
  /// Subclasses may override this function to transform statements using some
  /// other mechanism.
  ///
  /// \returns the transformed statement.
  StmtResult TransformStmt(Stmt *S, StmtDiscardKind SDK = SDK_Discarded);

  /// Transform the given statement.
  ///
  /// By default, this routine transforms a statement by delegating to the
  /// appropriate TransformOMPXXXClause function to transform a specific kind
  /// of clause. Subclasses may override this function to transform statements
  /// using some other mechanism.
  ///
  /// \returns the transformed OpenMP clause.
  OMPClause *TransformOMPClause(OMPClause *S);

  /// Transform the given attribute.
  ///
  /// By default, this routine transforms a statement by delegating to the
  /// appropriate TransformXXXAttr function to transform a specific kind
  /// of attribute. Subclasses may override this function to transform
  /// attributed statements using some other mechanism.
  ///
  /// \returns the transformed attribute
  const Attr *TransformAttr(const Attr *S);

/// Transform the specified attribute.
///
/// Subclasses should override the transformation of attributes with a pragma
/// spelling to transform expressions stored within the attribute.
///
/// \returns the transformed attribute.
#define ATTR(X)
#define PRAGMA_SPELLING_ATTR(X)                                                \
  const X##Attr *Transform##X##Attr(const X##Attr *R) { return R; }
#include "clang/Basic/AttrList.inc"

  /// Transform the given expression.
  ///
  /// By default, this routine transforms an expression by delegating to the
  /// appropriate TransformXXXExpr function to build a new expression.
  /// Subclasses may override this function to transform expressions using some
  /// other mechanism.
  ///
  /// \returns the transformed expression.
  ExprResult TransformExpr(Expr *E);

  /// Transform the given initializer.
  ///
  /// By default, this routine transforms an initializer by stripping off the
  /// semantic nodes added by initialization, then passing the result to
  /// TransformExpr or TransformExprs.
  ///
  /// \returns the transformed initializer.
  ExprResult TransformInitializer(Expr *Init, bool NotCopyInit);

  /// Transform the given list of expressions.
  ///
  /// This routine transforms a list of expressions by invoking
  /// \c TransformExpr() for each subexpression. However, it also provides
  /// support for variadic templates by expanding any pack expansions (if the
  /// derived class permits such expansion) along the way. When pack expansions
  /// are present, the number of outputs may not equal the number of inputs.
  ///
  /// \param Inputs The set of expressions to be transformed.
  ///
  /// \param NumInputs The number of expressions in \c Inputs.
  ///
  /// \param IsCall If \c true, then this transform is being performed on
  /// function-call arguments, and any arguments that should be dropped, will
  /// be.
  ///
  /// \param Outputs The transformed input expressions will be added to this
  /// vector.
  ///
  /// \param ArgChanged If non-NULL, will be set \c true if any argument changed
  /// due to transformation.
  ///
  /// \returns true if an error occurred, false otherwise.
  bool TransformExprs(Expr *const *Inputs, unsigned NumInputs, bool IsCall,
                      SmallVectorImpl<Expr *> &Outputs,
                      bool *ArgChanged = nullptr);

  /// Transform the given declaration, which is referenced from a type
  /// or expression.
  ///
  /// By default, acts as the identity function on declarations, unless the
  /// transformer has had to transform the declaration itself. Subclasses
  /// may override this function to provide alternate behavior.
  Decl *TransformDecl(SourceLocation Loc, Decl *D) {
    llvm::DenseMap<Decl *, Decl *>::iterator Known
      = TransformedLocalDecls.find(D);
    if (Known != TransformedLocalDecls.end())
      return Known->second;

    return D;
  }

  /// Transform the specified condition.
  ///
  /// By default, this transforms the variable and expression and rebuilds
  /// the condition.
  Sema::ConditionResult TransformCondition(SourceLocation Loc, VarDecl *Var,
                                           Expr *Expr,
                                           Sema::ConditionKind Kind);

  /// Transform the attributes associated with the given declaration and
  /// place them on the new declaration.
  ///
  /// By default, this operation does nothing. Subclasses may override this
  /// behavior to transform attributes.
  void transformAttrs(Decl *Old, Decl *New) { }

  /// Note that a local declaration has been transformed by this
  /// transformer.
  ///
  /// Local declarations are typically transformed via a call to
  /// TransformDefinition. However, in some cases (e.g., lambda expressions),
  /// the transformer itself has to transform the declarations. This routine
  /// can be overridden by a subclass that keeps track of such mappings.
  void transformedLocalDecl(Decl *Old, ArrayRef<Decl *> New) {
    assert(New.size() == 1 &&
           "must override transformedLocalDecl if performing pack expansion");
    TransformedLocalDecls[Old] = New.front();
  }

  /// Transform the definition of the given declaration.
  ///
  /// By default, invokes TransformDecl() to transform the declaration.
  /// Subclasses may override this function to provide alternate behavior.
  Decl *TransformDefinition(SourceLocation Loc, Decl *D) {
    return getDerived().TransformDecl(Loc, D);
  }

  /// Transform the given declaration, which was the first part of a
  /// nested-name-specifier in a member access expression.
  ///
  /// This specific declaration transformation only applies to the first
  /// identifier in a nested-name-specifier of a member access expression, e.g.,
  /// the \c T in \c x->T::member
  ///
  /// By default, invokes TransformDecl() to transform the declaration.
  /// Subclasses may override this function to provide alternate behavior.
  NamedDecl *TransformFirstQualifierInScope(NamedDecl *D, SourceLocation Loc) {
    return cast_or_null<NamedDecl>(getDerived().TransformDecl(Loc, D));
  }

  /// Transform the set of declarations in an OverloadExpr.
  bool TransformOverloadExprDecls(OverloadExpr *Old, bool RequiresADL,
                                  LookupResult &R);

  /// Transform the given nested-name-specifier with source-location
  /// information.
  ///
  /// By default, transforms all of the types and declarations within the
  /// nested-name-specifier. Subclasses may override this function to provide
  /// alternate behavior.
  NestedNameSpecifierLoc
  TransformNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS,
                                  QualType ObjectType = QualType(),
                                  NamedDecl *FirstQualifierInScope = nullptr);

  /// Transform the given declaration name.
  ///
  /// By default, transforms the types of conversion function, constructor,
  /// and destructor names and then (if needed) rebuilds the declaration name.
  /// Identifiers and selectors are returned unmodified. Subclasses may
  /// override this function to provide alternate behavior.
  DeclarationNameInfo
  TransformDeclarationNameInfo(const DeclarationNameInfo &NameInfo);

  bool TransformRequiresExprRequirements(ArrayRef<concepts::Requirement *> Reqs,
      llvm::SmallVectorImpl<concepts::Requirement *> &Transformed);
  concepts::TypeRequirement *
  TransformTypeRequirement(concepts::TypeRequirement *Req);
  concepts::ExprRequirement *
  TransformExprRequirement(concepts::ExprRequirement *Req);
  concepts::NestedRequirement *
  TransformNestedRequirement(concepts::NestedRequirement *Req);

  /// Transform the given template name.
  ///
  /// \param SS The nested-name-specifier that qualifies the template
  /// name. This nested-name-specifier must already have been transformed.
  ///
  /// \param Name The template name to transform.
  ///
  /// \param NameLoc The source location of the template name.
  ///
  /// \param ObjectType If we're translating a template name within a member
  /// access expression, this is the type of the object whose member template
  /// is being referenced.
  ///
  /// \param FirstQualifierInScope If the first part of a nested-name-specifier
  /// also refers to a name within the current (lexical) scope, this is the
  /// declaration it refers to.
  ///
  /// By default, transforms the template name by transforming the declarations
  /// and nested-name-specifiers that occur within the template name.
  /// Subclasses may override this function to provide alternate behavior.
  TemplateName
  TransformTemplateName(CXXScopeSpec &SS, TemplateName Name,
                        SourceLocation NameLoc,
                        QualType ObjectType = QualType(),
                        NamedDecl *FirstQualifierInScope = nullptr,
                        bool AllowInjectedClassName = false);

  /// Transform the given template argument.
  ///
  /// By default, this operation transforms the type, expression, or
  /// declaration stored within the template argument and constructs a
  /// new template argument from the transformed result. Subclasses may
  /// override this function to provide alternate behavior.
  ///
  /// Returns true if there was an error.
  bool TransformTemplateArgument(const TemplateArgumentLoc &Input,
                                 TemplateArgumentLoc &Output,
                                 bool Uneval = false);

  /// Transform the given set of template arguments.
  ///
  /// By default, this operation transforms all of the template arguments
  /// in the input set using \c TransformTemplateArgument(), and appends
  /// the transformed arguments to the output list.
  ///
  /// Note that this overload of \c TransformTemplateArguments() is merely
  /// a convenience function. Subclasses that wish to override this behavior
  /// should override the iterator-based member template version.
  ///
  /// \param Inputs The set of template arguments to be transformed.
  ///
  /// \param NumInputs The number of template arguments in \p Inputs.
  ///
  /// \param Outputs The set of transformed template arguments output by this
  /// routine.
  ///
  /// Returns true if an error occurred.
  bool TransformTemplateArguments(const TemplateArgumentLoc *Inputs,
                                  unsigned NumInputs,
                                  TemplateArgumentListInfo &Outputs,
                                  bool Uneval = false) {
    return TransformTemplateArguments(Inputs, Inputs + NumInputs, Outputs,
                                      Uneval);
  }

  /// Transform the given set of template arguments.
  ///
  /// By default, this operation transforms all of the template arguments
  /// in the input set using \c TransformTemplateArgument(), and appends
  /// the transformed arguments to the output list.
  ///
  /// \param First An iterator to the first template argument.
  ///
  /// \param Last An iterator one step past the last template argument.
  ///
  /// \param Outputs The set of transformed template arguments output by this
  /// routine.
  ///
  /// Returns true if an error occurred.
  template<typename InputIterator>
  bool TransformTemplateArguments(InputIterator First,
                                  InputIterator Last,
                                  TemplateArgumentListInfo &Outputs,
                                  bool Uneval = false);

  /// Fakes up a TemplateArgumentLoc for a given TemplateArgument.
  void InventTemplateArgumentLoc(const TemplateArgument &Arg,
                                 TemplateArgumentLoc &ArgLoc);

  /// Fakes up a TypeSourceInfo for a type.
  TypeSourceInfo *InventTypeSourceInfo(QualType T) {
    return SemaRef.Context.getTrivialTypeSourceInfo(T,
                       getDerived().getBaseLocation());
  }

#define ABSTRACT_TYPELOC(CLASS, PARENT)
#define TYPELOC(CLASS, PARENT)                                   \
  QualType Transform##CLASS##Type(TypeLocBuilder &TLB, CLASS##TypeLoc T);
#include "clang/AST/TypeLocNodes.def"

  template<typename Fn>
  QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
                                      FunctionProtoTypeLoc TL,
                                      CXXRecordDecl *ThisContext,
                                      Qualifiers ThisTypeQuals,
                                      Fn TransformExceptionSpec);

  bool TransformExceptionSpec(SourceLocation Loc,
                              FunctionProtoType::ExceptionSpecInfo &ESI,
                              SmallVectorImpl<QualType> &Exceptions,
                              bool &Changed);

  StmtResult TransformSEHHandler(Stmt *Handler);

  QualType
  TransformTemplateSpecializationType(TypeLocBuilder &TLB,
                                      TemplateSpecializationTypeLoc TL,
                                      TemplateName Template);

  QualType
  TransformDependentTemplateSpecializationType(TypeLocBuilder &TLB,
                                      DependentTemplateSpecializationTypeLoc TL,
                                               TemplateName Template,
                                               CXXScopeSpec &SS);

  QualType TransformDependentTemplateSpecializationType(
      TypeLocBuilder &TLB, DependentTemplateSpecializationTypeLoc TL,
      NestedNameSpecifierLoc QualifierLoc);

  /// Transforms the parameters of a function type into the
  /// given vectors.
  ///
  /// The result vectors should be kept in sync; null entries in the
  /// variables vector are acceptable.
  ///
  /// Return true on error.
  bool TransformFunctionTypeParams(
      SourceLocation Loc, ArrayRef<ParmVarDecl *> Params,
      const QualType *ParamTypes,
      const FunctionProtoType::ExtParameterInfo *ParamInfos,
      SmallVectorImpl<QualType> &PTypes, SmallVectorImpl<ParmVarDecl *> *PVars,
      Sema::ExtParameterInfoBuilder &PInfos);

  /// Transforms a single function-type parameter.  Return null
  /// on error.
  ///
  /// \param indexAdjustment - A number to add to the parameter's
  ///   scope index;  can be negative
  ParmVarDecl *TransformFunctionTypeParam(ParmVarDecl *OldParm,
                                          int indexAdjustment,
                                          Optional<unsigned> NumExpansions,
                                          bool ExpectParameterPack);

  /// Transform the body of a lambda-expression.
  StmtResult TransformLambdaBody(LambdaExpr *E, Stmt *Body);
  /// Alternative implementation of TransformLambdaBody that skips transforming
  /// the body.
  StmtResult SkipLambdaBody(LambdaExpr *E, Stmt *Body);

  QualType TransformReferenceType(TypeLocBuilder &TLB, ReferenceTypeLoc TL);

  StmtResult TransformCompoundStmt(CompoundStmt *S, bool IsStmtExpr);
  ExprResult TransformCXXNamedCastExpr(CXXNamedCastExpr *E);

  TemplateParameterList *TransformTemplateParameterList(
        TemplateParameterList *TPL) {
    return TPL;
  }

  ExprResult TransformAddressOfOperand(Expr *E);

  ExprResult TransformDependentScopeDeclRefExpr(DependentScopeDeclRefExpr *E,
                                                bool IsAddressOfOperand,
                                                TypeSourceInfo **RecoveryTSI);

  ExprResult TransformParenDependentScopeDeclRefExpr(
      ParenExpr *PE, DependentScopeDeclRefExpr *DRE, bool IsAddressOfOperand,
      TypeSourceInfo **RecoveryTSI);

  StmtResult TransformOMPExecutableDirective(OMPExecutableDirective *S);

// FIXME: We use LLVM_ATTRIBUTE_NOINLINE because inlining causes a ridiculous
// amount of stack usage with clang.
#define STMT(Node, Parent)                        \
  LLVM_ATTRIBUTE_NOINLINE \
  StmtResult Transform##Node(Node *S);
#define VALUESTMT(Node, Parent)                   \
  LLVM_ATTRIBUTE_NOINLINE \
  StmtResult Transform##Node(Node *S, StmtDiscardKind SDK);
#define EXPR(Node, Parent)                        \
  LLVM_ATTRIBUTE_NOINLINE \
  ExprResult Transform##Node(Node *E);
#define ABSTRACT_STMT(Stmt)
#include "clang/AST/StmtNodes.inc"

#define GEN_CLANG_CLAUSE_CLASS
#define CLAUSE_CLASS(Enum, Str, Class)                                         \
  LLVM_ATTRIBUTE_NOINLINE                                                      \
  OMPClause *Transform##Class(Class *S);
#include "llvm/Frontend/OpenMP/OMP.inc"

  /// Build a new qualified type given its unqualified type and type location.
  ///
  /// By default, this routine adds type qualifiers only to types that can
  /// have qualifiers, and silently suppresses those qualifiers that are not
  /// permitted. Subclasses may override this routine to provide different
  /// behavior.
  QualType RebuildQualifiedType(QualType T, QualifiedTypeLoc TL);

  /// Build a new pointer type given its pointee type.
  ///
  /// By default, performs semantic analysis when building the pointer type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildPointerType(QualType PointeeType, SourceLocation Sigil);

  /// Build a new block pointer type given its pointee type.
  ///
  /// By default, performs semantic analysis when building the block pointer
  /// type. Subclasses may override this routine to provide different behavior.
  QualType RebuildBlockPointerType(QualType PointeeType, SourceLocation Sigil);

  /// Build a new reference type given the type it references.
  ///
  /// By default, performs semantic analysis when building the
  /// reference type. Subclasses may override this routine to provide
  /// different behavior.
  ///
  /// \param LValue whether the type was written with an lvalue sigil
  /// or an rvalue sigil.
  QualType RebuildReferenceType(QualType ReferentType,
                                bool LValue,
                                SourceLocation Sigil);

  /// Build a new member pointer type given the pointee type and the
  /// class type it refers into.
  ///
  /// By default, performs semantic analysis when building the member pointer
  /// type. Subclasses may override this routine to provide different behavior.
  QualType RebuildMemberPointerType(QualType PointeeType, QualType ClassType,
                                    SourceLocation Sigil);

  QualType RebuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
                                    SourceLocation ProtocolLAngleLoc,
                                    ArrayRef<ObjCProtocolDecl *> Protocols,
                                    ArrayRef<SourceLocation> ProtocolLocs,
                                    SourceLocation ProtocolRAngleLoc);

  /// Build an Objective-C object type.
  ///
  /// By default, performs semantic analysis when building the object type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildObjCObjectType(QualType BaseType,
                                 SourceLocation Loc,
                                 SourceLocation TypeArgsLAngleLoc,
                                 ArrayRef<TypeSourceInfo *> TypeArgs,
                                 SourceLocation TypeArgsRAngleLoc,
                                 SourceLocation ProtocolLAngleLoc,
                                 ArrayRef<ObjCProtocolDecl *> Protocols,
                                 ArrayRef<SourceLocation> ProtocolLocs,
                                 SourceLocation ProtocolRAngleLoc);

  /// Build a new Objective-C object pointer type given the pointee type.
  ///
  /// By default, directly builds the pointer type, with no additional semantic
  /// analysis.
  QualType RebuildObjCObjectPointerType(QualType PointeeType,
                                        SourceLocation Star);

  /// Build a new array type given the element type, size
  /// modifier, size of the array (if known), size expression, and index type
  /// qualifiers.
  ///
  /// By default, performs semantic analysis when building the array type.
  /// Subclasses may override this routine to provide different behavior.
  /// Also by default, all of the other Rebuild*Array
  QualType RebuildArrayType(QualType ElementType,
                            ArrayType::ArraySizeModifier SizeMod,
                            const llvm::APInt *Size,
                            Expr *SizeExpr,
                            unsigned IndexTypeQuals,
                            SourceRange BracketsRange);

  /// Build a new constant array type given the element type, size
  /// modifier, (known) size of the array, and index type qualifiers.
  ///
  /// By default, performs semantic analysis when building the array type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildConstantArrayType(QualType ElementType,
                                    ArrayType::ArraySizeModifier SizeMod,
                                    const llvm::APInt &Size,
                                    Expr *SizeExpr,
                                    unsigned IndexTypeQuals,
                                    SourceRange BracketsRange);

  /// Build a new incomplete array type given the element type, size
  /// modifier, and index type qualifiers.
  ///
  /// By default, performs semantic analysis when building the array type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildIncompleteArrayType(QualType ElementType,
                                      ArrayType::ArraySizeModifier SizeMod,
                                      unsigned IndexTypeQuals,
                                      SourceRange BracketsRange);

  /// Build a new variable-length array type given the element type,
  /// size modifier, size expression, and index type qualifiers.
  ///
  /// By default, performs semantic analysis when building the array type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildVariableArrayType(QualType ElementType,
                                    ArrayType::ArraySizeModifier SizeMod,
                                    Expr *SizeExpr,
                                    unsigned IndexTypeQuals,
                                    SourceRange BracketsRange);

  /// Build a new dependent-sized array type given the element type,
  /// size modifier, size expression, and index type qualifiers.
  ///
  /// By default, performs semantic analysis when building the array type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildDependentSizedArrayType(QualType ElementType,
                                          ArrayType::ArraySizeModifier SizeMod,
                                          Expr *SizeExpr,
                                          unsigned IndexTypeQuals,
                                          SourceRange BracketsRange);

  /// Build a new vector type given the element type and
  /// number of elements.
  ///
  /// By default, performs semantic analysis when building the vector type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildVectorType(QualType ElementType, unsigned NumElements,
                             VectorType::VectorKind VecKind);

  /// Build a new potentially dependently-sized extended vector type
  /// given the element type and number of elements.
  ///
  /// By default, performs semantic analysis when building the vector type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildDependentVectorType(QualType ElementType, Expr *SizeExpr,
                                           SourceLocation AttributeLoc,
                                           VectorType::VectorKind);

  /// Build a new extended vector type given the element type and
  /// number of elements.
  ///
  /// By default, performs semantic analysis when building the vector type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildExtVectorType(QualType ElementType, unsigned NumElements,
                                SourceLocation AttributeLoc);

  /// Build a new potentially dependently-sized extended vector type
  /// given the element type and number of elements.
  ///
  /// By default, performs semantic analysis when building the vector type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildDependentSizedExtVectorType(QualType ElementType,
                                              Expr *SizeExpr,
                                              SourceLocation AttributeLoc);

  /// Build a new matrix type given the element type and dimensions.
  QualType RebuildConstantMatrixType(QualType ElementType, unsigned NumRows,
                                     unsigned NumColumns);

  /// Build a new matrix type given the type and dependently-defined
  /// dimensions.
  QualType RebuildDependentSizedMatrixType(QualType ElementType, Expr *RowExpr,
                                           Expr *ColumnExpr,
                                           SourceLocation AttributeLoc);

  /// Build a new DependentAddressSpaceType or return the pointee
  /// type variable with the correct address space (retrieved from
  /// AddrSpaceExpr) applied to it. The former will be returned in cases
  /// where the address space remains dependent.
  ///
  /// By default, performs semantic analysis when building the type with address
  /// space applied. Subclasses may override this routine to provide different
  /// behavior.
  QualType RebuildDependentAddressSpaceType(QualType PointeeType,
                                            Expr *AddrSpaceExpr,
                                            SourceLocation AttributeLoc);

  /// Build a new function type.
  ///
  /// By default, performs semantic analysis when building the function type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildFunctionProtoType(QualType T,
                                    MutableArrayRef<QualType> ParamTypes,
                                    const FunctionProtoType::ExtProtoInfo &EPI);

  /// Build a new unprototyped function type.
  QualType RebuildFunctionNoProtoType(QualType ResultType);

  /// Rebuild an unresolved typename type, given the decl that
  /// the UnresolvedUsingTypenameDecl was transformed to.
  QualType RebuildUnresolvedUsingType(SourceLocation NameLoc, Decl *D);

  /// Build a new typedef type.
  QualType RebuildTypedefType(TypedefNameDecl *Typedef) {
    return SemaRef.Context.getTypeDeclType(Typedef);
  }

  /// Build a new MacroDefined type.
  QualType RebuildMacroQualifiedType(QualType T,
                                     const IdentifierInfo *MacroII) {
    return SemaRef.Context.getMacroQualifiedType(T, MacroII);
  }

  /// Build a new class/struct/union type.
  QualType RebuildRecordType(RecordDecl *Record) {
    return SemaRef.Context.getTypeDeclType(Record);
  }

  /// Build a new Enum type.
  QualType RebuildEnumType(EnumDecl *Enum) {
    return SemaRef.Context.getTypeDeclType(Enum);
  }

  /// Build a new typeof(expr) type.
  ///
  /// By default, performs semantic analysis when building the typeof type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildTypeOfExprType(Expr *Underlying, SourceLocation Loc);

  /// Build a new typeof(type) type.
  ///
  /// By default, builds a new TypeOfType with the given underlying type.
  QualType RebuildTypeOfType(QualType Underlying);

  /// Build a new unary transform type.
  QualType RebuildUnaryTransformType(QualType BaseType,
                                     UnaryTransformType::UTTKind UKind,
                                     SourceLocation Loc);

  /// Build a new C++11 decltype type.
  ///
  /// By default, performs semantic analysis when building the decltype type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildDecltypeType(Expr *Underlying, SourceLocation Loc);

  /// Build a new C++11 auto type.
  ///
  /// By default, builds a new AutoType with the given deduced type.
  QualType RebuildAutoType(QualType Deduced, AutoTypeKeyword Keyword,
                           ConceptDecl *TypeConstraintConcept,
                           ArrayRef<TemplateArgument> TypeConstraintArgs) {
    // Note, IsDependent is always false here: we implicitly convert an 'auto'
    // which has been deduced to a dependent type into an undeduced 'auto', so
    // that we'll retry deduction after the transformation.
    return SemaRef.Context.getAutoType(Deduced, Keyword,
                                       /*IsDependent*/ false, /*IsPack=*/false,
                                       TypeConstraintConcept,
                                       TypeConstraintArgs);
  }

  /// By default, builds a new DeducedTemplateSpecializationType with the given
  /// deduced type.
  QualType RebuildDeducedTemplateSpecializationType(TemplateName Template,
      QualType Deduced) {
    return SemaRef.Context.getDeducedTemplateSpecializationType(
        Template, Deduced, /*IsDependent*/ false);
  }

  /// Build a new template specialization type.
  ///
  /// By default, performs semantic analysis when building the template
  /// specialization type. Subclasses may override this routine to provide
  /// different behavior.
  QualType RebuildTemplateSpecializationType(TemplateName Template,
                                             SourceLocation TemplateLoc,
                                             TemplateArgumentListInfo &Args);

  /// Build a new parenthesized type.
  ///
  /// By default, builds a new ParenType type from the inner type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildParenType(QualType InnerType) {
    return SemaRef.BuildParenType(InnerType);
  }

  /// Build a new qualified name type.
  ///
  /// By default, builds a new ElaboratedType type from the keyword,
  /// the nested-name-specifier and the named type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildElaboratedType(SourceLocation KeywordLoc,
                                 ElaboratedTypeKeyword Keyword,
                                 NestedNameSpecifierLoc QualifierLoc,
                                 QualType Named) {
    return SemaRef.Context.getElaboratedType(Keyword,
                                         QualifierLoc.getNestedNameSpecifier(),
                                             Named);
  }

  /// Build a new typename type that refers to a template-id.
  ///
  /// By default, builds a new DependentNameType type from the
  /// nested-name-specifier and the given type. Subclasses may override
  /// this routine to provide different behavior.
  QualType RebuildDependentTemplateSpecializationType(
                                          ElaboratedTypeKeyword Keyword,
                                          NestedNameSpecifierLoc QualifierLoc,
                                          SourceLocation TemplateKWLoc,
                                          const IdentifierInfo *Name,
                                          SourceLocation NameLoc,
                                          TemplateArgumentListInfo &Args,
                                          bool AllowInjectedClassName) {
    // Rebuild the template name.
    // TODO: avoid TemplateName abstraction
    CXXScopeSpec SS;
    SS.Adopt(QualifierLoc);
    TemplateName InstName = getDerived().RebuildTemplateName(
        SS, TemplateKWLoc, *Name, NameLoc, QualType(), nullptr,
        AllowInjectedClassName);

    if (InstName.isNull())
      return QualType();

    // If it's still dependent, make a dependent specialization.
    if (InstName.getAsDependentTemplateName())
      return SemaRef.Context.getDependentTemplateSpecializationType(Keyword,
                                          QualifierLoc.getNestedNameSpecifier(),
                                                                    Name,
                                                                    Args);

    // Otherwise, make an elaborated type wrapping a non-dependent
    // specialization.
    QualType T =
    getDerived().RebuildTemplateSpecializationType(InstName, NameLoc, Args);
    if (T.isNull()) return QualType();

    if (Keyword == ETK_None && QualifierLoc.getNestedNameSpecifier() == nullptr)
      return T;

    return SemaRef.Context.getElaboratedType(Keyword,
                                       QualifierLoc.getNestedNameSpecifier(),
                                             T);
  }

  /// Build a new typename type that refers to an identifier.
  ///
  /// By default, performs semantic analysis when building the typename type
  /// (or elaborated type). Subclasses may override this routine to provide
  /// different behavior.
  QualType RebuildDependentNameType(ElaboratedTypeKeyword Keyword,
                                    SourceLocation KeywordLoc,
                                    NestedNameSpecifierLoc QualifierLoc,
                                    const IdentifierInfo *Id,
                                    SourceLocation IdLoc,
                                    bool DeducedTSTContext) {
    CXXScopeSpec SS;
    SS.Adopt(QualifierLoc);

    if (QualifierLoc.getNestedNameSpecifier()->isDependent()) {
      // If the name is still dependent, just build a new dependent name type.
      if (!SemaRef.computeDeclContext(SS))
        return SemaRef.Context.getDependentNameType(Keyword,
                                          QualifierLoc.getNestedNameSpecifier(),
                                                    Id);
    }

    if (Keyword == ETK_None || Keyword == ETK_Typename) {
      return SemaRef.CheckTypenameType(Keyword, KeywordLoc, QualifierLoc,
                                       *Id, IdLoc, DeducedTSTContext);
    }

    TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForKeyword(Keyword);

    // We had a dependent elaborated-type-specifier that has been transformed
    // into a non-dependent elaborated-type-specifier. Find the tag we're
    // referring to.
    LookupResult Result(SemaRef, Id, IdLoc, Sema::LookupTagName);
    DeclContext *DC = SemaRef.computeDeclContext(SS, false);
    if (!DC)
      return QualType();

    if (SemaRef.RequireCompleteDeclContext(SS, DC))
      return QualType();

    TagDecl *Tag = nullptr;
    SemaRef.LookupQualifiedName(Result, DC);
    switch (Result.getResultKind()) {
      case LookupResult::NotFound:
      case LookupResult::NotFoundInCurrentInstantiation:
        break;

      case LookupResult::Found:
        Tag = Result.getAsSingle<TagDecl>();
        break;

      case LookupResult::FoundOverloaded:
      case LookupResult::FoundUnresolvedValue:
        llvm_unreachable("Tag lookup cannot find non-tags");

      case LookupResult::Ambiguous:
        // Let the LookupResult structure handle ambiguities.
        return QualType();
    }

    if (!Tag) {
      // Check where the name exists but isn't a tag type and use that to emit
      // better diagnostics.
      LookupResult Result(SemaRef, Id, IdLoc, Sema::LookupTagName);
      SemaRef.LookupQualifiedName(Result, DC);
      switch (Result.getResultKind()) {
        case LookupResult::Found:
        case LookupResult::FoundOverloaded:
        case LookupResult::FoundUnresolvedValue: {
          NamedDecl *SomeDecl = Result.getRepresentativeDecl();
          Sema::NonTagKind NTK = SemaRef.getNonTagTypeDeclKind(SomeDecl, Kind);
          SemaRef.Diag(IdLoc, diag::err_tag_reference_non_tag) << SomeDecl
                                                               << NTK << Kind;
          SemaRef.Diag(SomeDecl->getLocation(), diag::note_declared_at);
          break;
        }
        default:
          SemaRef.Diag(IdLoc, diag::err_not_tag_in_scope)
              << Kind << Id << DC << QualifierLoc.getSourceRange();
          break;
      }
      return QualType();
    }

    if (!SemaRef.isAcceptableTagRedeclaration(Tag, Kind, /*isDefinition*/false,
                                              IdLoc, Id)) {
      SemaRef.Diag(KeywordLoc, diag::err_use_with_wrong_tag) << Id;
      SemaRef.Diag(Tag->getLocation(), diag::note_previous_use);
      return QualType();
    }

    // Build the elaborated-type-specifier type.
    QualType T = SemaRef.Context.getTypeDeclType(Tag);
    return SemaRef.Context.getElaboratedType(Keyword,
                                         QualifierLoc.getNestedNameSpecifier(),
                                             T);
  }

  /// Build a new pack expansion type.
  ///
  /// By default, builds a new PackExpansionType type from the given pattern.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildPackExpansionType(QualType Pattern,
                                    SourceRange PatternRange,
                                    SourceLocation EllipsisLoc,
                                    Optional<unsigned> NumExpansions) {
    return getSema().CheckPackExpansion(Pattern, PatternRange, EllipsisLoc,
                                        NumExpansions);
  }

  /// Build a new atomic type given its value type.
  ///
  /// By default, performs semantic analysis when building the atomic type.
  /// Subclasses may override this routine to provide different behavior.
  QualType RebuildAtomicType(QualType ValueType, SourceLocation KWLoc);

  /// Build a new pipe type given its value type.
  QualType RebuildPipeType(QualType ValueType, SourceLocation KWLoc,
                           bool isReadPipe);

   /// Build an extended int given its value type.
  QualType RebuildExtIntType(bool IsUnsigned, unsigned NumBits,
                             SourceLocation Loc);

  /// Build a dependent extended int given its value type.
  QualType RebuildDependentExtIntType(bool IsUnsigned, Expr *NumBitsExpr,
                                      SourceLocation Loc);

  /// Build a new template name given a nested name specifier, a flag
  /// indicating whether the "template" keyword was provided, and the template
  /// that the template name refers to.
  ///
  /// By default, builds the new template name directly. Subclasses may override
  /// this routine to provide different behavior.
  TemplateName RebuildTemplateName(CXXScopeSpec &SS,
                                   bool TemplateKW,
                                   TemplateDecl *Template);

  /// Build a new template name given a nested name specifier and the
  /// name that is referred to as a template.
  ///
  /// By default, performs semantic analysis to determine whether the name can
  /// be resolved to a specific template, then builds the appropriate kind of
  /// template name. Subclasses may override this routine to provide different
  /// behavior.
  TemplateName RebuildTemplateName(CXXScopeSpec &SS,
                                   SourceLocation TemplateKWLoc,
                                   const IdentifierInfo &Name,
                                   SourceLocation NameLoc, QualType ObjectType,
                                   NamedDecl *FirstQualifierInScope,
                                   bool AllowInjectedClassName);

  /// Build a new template name given a nested name specifier and the
  /// overloaded operator name that is referred to as a template.
  ///
  /// By default, performs semantic analysis to determine whether the name can
  /// be resolved to a specific template, then builds the appropriate kind of
  /// template name. Subclasses may override this routine to provide different
  /// behavior.
  TemplateName RebuildTemplateName(CXXScopeSpec &SS,
                                   SourceLocation TemplateKWLoc,
                                   OverloadedOperatorKind Operator,
                                   SourceLocation NameLoc, QualType ObjectType,
                                   bool AllowInjectedClassName);

  /// Build a new template name given a template template parameter pack
  /// and the
  ///
  /// By default, performs semantic analysis to determine whether the name can
  /// be resolved to a specific template, then builds the appropriate kind of
  /// template name. Subclasses may override this routine to provide different
  /// behavior.
  TemplateName RebuildTemplateName(TemplateTemplateParmDecl *Param,
                                   const TemplateArgument &ArgPack) {
    return getSema().Context.getSubstTemplateTemplateParmPack(Param, ArgPack);
  }

  /// Build a new compound statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildCompoundStmt(SourceLocation LBraceLoc,
                                       MultiStmtArg Statements,
                                       SourceLocation RBraceLoc,
                                       bool IsStmtExpr) {
    return getSema().ActOnCompoundStmt(LBraceLoc, RBraceLoc, Statements,
                                       IsStmtExpr);
  }

  /// Build a new case statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildCaseStmt(SourceLocation CaseLoc,
                                   Expr *LHS,
                                   SourceLocation EllipsisLoc,
                                   Expr *RHS,
                                   SourceLocation ColonLoc) {
    return getSema().ActOnCaseStmt(CaseLoc, LHS, EllipsisLoc, RHS,
                                   ColonLoc);
  }

  /// Attach the body to a new case statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildCaseStmtBody(Stmt *S, Stmt *Body) {
    getSema().ActOnCaseStmtBody(S, Body);
    return S;
  }

  /// Build a new default statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildDefaultStmt(SourceLocation DefaultLoc,
                                      SourceLocation ColonLoc,
                                      Stmt *SubStmt) {
    return getSema().ActOnDefaultStmt(DefaultLoc, ColonLoc, SubStmt,
                                      /*CurScope=*/nullptr);
  }

  /// Build a new label statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildLabelStmt(SourceLocation IdentLoc, LabelDecl *L,
                              SourceLocation ColonLoc, Stmt *SubStmt) {
    return SemaRef.ActOnLabelStmt(IdentLoc, L, ColonLoc, SubStmt);
  }

  /// Build a new attributed statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildAttributedStmt(SourceLocation AttrLoc,
                                   ArrayRef<const Attr *> Attrs,
                                   Stmt *SubStmt) {
    return SemaRef.BuildAttributedStmt(AttrLoc, Attrs, SubStmt);
  }

  /// Build a new "if" statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildIfStmt(SourceLocation IfLoc, IfStatementKind Kind,
                           SourceLocation LParenLoc, Sema::ConditionResult Cond,
                           SourceLocation RParenLoc, Stmt *Init, Stmt *Then,
                           SourceLocation ElseLoc, Stmt *Else) {
    return getSema().ActOnIfStmt(IfLoc, Kind, LParenLoc, Init, Cond, RParenLoc,
                                 Then, ElseLoc, Else);
  }

  /// Start building a new switch statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildSwitchStmtStart(SourceLocation SwitchLoc,
                                    SourceLocation LParenLoc, Stmt *Init,
                                    Sema::ConditionResult Cond,
                                    SourceLocation RParenLoc) {
    return getSema().ActOnStartOfSwitchStmt(SwitchLoc, LParenLoc, Init, Cond,
                                            RParenLoc);
  }

  /// Attach the body to the switch statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildSwitchStmtBody(SourceLocation SwitchLoc,
                                   Stmt *Switch, Stmt *Body) {
    return getSema().ActOnFinishSwitchStmt(SwitchLoc, Switch, Body);
  }

  /// Build a new while statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildWhileStmt(SourceLocation WhileLoc, SourceLocation LParenLoc,
                              Sema::ConditionResult Cond,
                              SourceLocation RParenLoc, Stmt *Body) {
    return getSema().ActOnWhileStmt(WhileLoc, LParenLoc, Cond, RParenLoc, Body);
  }

  /// Build a new do-while statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildDoStmt(SourceLocation DoLoc, Stmt *Body,
                           SourceLocation WhileLoc, SourceLocation LParenLoc,
                           Expr *Cond, SourceLocation RParenLoc) {
    return getSema().ActOnDoStmt(DoLoc, Body, WhileLoc, LParenLoc,
                                 Cond, RParenLoc);
  }

  /// Build a new for statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildForStmt(SourceLocation ForLoc, SourceLocation LParenLoc,
                            Stmt *Init, Sema::ConditionResult Cond,
                            Sema::FullExprArg Inc, SourceLocation RParenLoc,
                            Stmt *Body) {
    return getSema().ActOnForStmt(ForLoc, LParenLoc, Init, Cond,
                                  Inc, RParenLoc, Body);
  }

  /// Build a new goto statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc,
                             LabelDecl *Label) {
    return getSema().ActOnGotoStmt(GotoLoc, LabelLoc, Label);
  }

  /// Build a new indirect goto statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildIndirectGotoStmt(SourceLocation GotoLoc,
                                     SourceLocation StarLoc,
                                     Expr *Target) {
    return getSema().ActOnIndirectGotoStmt(GotoLoc, StarLoc, Target);
  }

  /// Build a new return statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildReturnStmt(SourceLocation ReturnLoc, Expr *Result) {
    return getSema().BuildReturnStmt(ReturnLoc, Result);
  }

  /// Build a new declaration statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildDeclStmt(MutableArrayRef<Decl *> Decls,
                             SourceLocation StartLoc, SourceLocation EndLoc) {
    Sema::DeclGroupPtrTy DG = getSema().BuildDeclaratorGroup(Decls);
    return getSema().ActOnDeclStmt(DG, StartLoc, EndLoc);
  }

  /// Build a new inline asm statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
                               bool IsVolatile, unsigned NumOutputs,
                               unsigned NumInputs, IdentifierInfo **Names,
                               MultiExprArg Constraints, MultiExprArg Exprs,
                               Expr *AsmString, MultiExprArg Clobbers,
                               unsigned NumLabels,
                               SourceLocation RParenLoc) {
    return getSema().ActOnGCCAsmStmt(AsmLoc, IsSimple, IsVolatile, NumOutputs,
                                     NumInputs, Names, Constraints, Exprs,
                                     AsmString, Clobbers, NumLabels, RParenLoc);
  }

  /// Build a new MS style inline asm statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
                              ArrayRef<Token> AsmToks,
                              StringRef AsmString,
                              unsigned NumOutputs, unsigned NumInputs,
                              ArrayRef<StringRef> Constraints,
                              ArrayRef<StringRef> Clobbers,
                              ArrayRef<Expr*> Exprs,
                              SourceLocation EndLoc) {
    return getSema().ActOnMSAsmStmt(AsmLoc, LBraceLoc, AsmToks, AsmString,
                                    NumOutputs, NumInputs,
                                    Constraints, Clobbers, Exprs, EndLoc);
  }

  /// Build a new co_return statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildCoreturnStmt(SourceLocation CoreturnLoc, Expr *Result,
                                 bool IsImplicit) {
    return getSema().BuildCoreturnStmt(CoreturnLoc, Result, IsImplicit);
  }

  /// Build a new co_await expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCoawaitExpr(SourceLocation CoawaitLoc, Expr *Result,
                                bool IsImplicit) {
    return getSema().BuildResolvedCoawaitExpr(CoawaitLoc, Result, IsImplicit);
  }

  /// Build a new co_await expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildDependentCoawaitExpr(SourceLocation CoawaitLoc,
                                         Expr *Result,
                                         UnresolvedLookupExpr *Lookup) {
    return getSema().BuildUnresolvedCoawaitExpr(CoawaitLoc, Result, Lookup);
  }

  /// Build a new co_yield expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCoyieldExpr(SourceLocation CoyieldLoc, Expr *Result) {
    return getSema().BuildCoyieldExpr(CoyieldLoc, Result);
  }

  StmtResult RebuildCoroutineBodyStmt(CoroutineBodyStmt::CtorArgs Args) {
    return getSema().BuildCoroutineBodyStmt(Args);
  }

  /// Build a new Objective-C \@try statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildObjCAtTryStmt(SourceLocation AtLoc,
                                        Stmt *TryBody,
                                        MultiStmtArg CatchStmts,
                                        Stmt *Finally) {
    return getSema().ActOnObjCAtTryStmt(AtLoc, TryBody, CatchStmts,
                                        Finally);
  }

  /// Rebuild an Objective-C exception declaration.
  ///
  /// By default, performs semantic analysis to build the new declaration.
  /// Subclasses may override this routine to provide different behavior.
  VarDecl *RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
                                    TypeSourceInfo *TInfo, QualType T) {
    return getSema().BuildObjCExceptionDecl(TInfo, T,
                                            ExceptionDecl->getInnerLocStart(),
                                            ExceptionDecl->getLocation(),
                                            ExceptionDecl->getIdentifier());
  }

  /// Build a new Objective-C \@catch statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildObjCAtCatchStmt(SourceLocation AtLoc,
                                          SourceLocation RParenLoc,
                                          VarDecl *Var,
                                          Stmt *Body) {
    return getSema().ActOnObjCAtCatchStmt(AtLoc, RParenLoc,
                                          Var, Body);
  }

  /// Build a new Objective-C \@finally statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildObjCAtFinallyStmt(SourceLocation AtLoc,
                                            Stmt *Body) {
    return getSema().ActOnObjCAtFinallyStmt(AtLoc, Body);
  }

  /// Build a new Objective-C \@throw statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildObjCAtThrowStmt(SourceLocation AtLoc,
                                          Expr *Operand) {
    return getSema().BuildObjCAtThrowStmt(AtLoc, Operand);
  }

  /// Build a new OpenMP Canonical loop.
  ///
  /// Ensures that the outermost loop in @p LoopStmt is wrapped by a
  /// OMPCanonicalLoop.
  StmtResult RebuildOMPCanonicalLoop(Stmt *LoopStmt) {
    return getSema().ActOnOpenMPCanonicalLoop(LoopStmt);
  }

  /// Build a new OpenMP executable directive.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildOMPExecutableDirective(OpenMPDirectiveKind Kind,
                                           DeclarationNameInfo DirName,
                                           OpenMPDirectiveKind CancelRegion,
                                           ArrayRef<OMPClause *> Clauses,
                                           Stmt *AStmt, SourceLocation StartLoc,
                                           SourceLocation EndLoc) {
    return getSema().ActOnOpenMPExecutableDirective(
        Kind, DirName, CancelRegion, Clauses, AStmt, StartLoc, EndLoc);
  }

  /// Build a new OpenMP 'if' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPIfClause(OpenMPDirectiveKind NameModifier,
                                Expr *Condition, SourceLocation StartLoc,
                                SourceLocation LParenLoc,
                                SourceLocation NameModifierLoc,
                                SourceLocation ColonLoc,
                                SourceLocation EndLoc) {
    return getSema().ActOnOpenMPIfClause(NameModifier, Condition, StartLoc,
                                         LParenLoc, NameModifierLoc, ColonLoc,
                                         EndLoc);
  }

  /// Build a new OpenMP 'final' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPFinalClause(Expr *Condition, SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc) {
    return getSema().ActOnOpenMPFinalClause(Condition, StartLoc, LParenLoc,
                                            EndLoc);
  }

  /// Build a new OpenMP 'num_threads' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPNumThreadsClause(Expr *NumThreads,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc) {
    return getSema().ActOnOpenMPNumThreadsClause(NumThreads, StartLoc,
                                                 LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'safelen' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPSafelenClause(Expr *Len, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc) {
    return getSema().ActOnOpenMPSafelenClause(Len, StartLoc, LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'simdlen' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPSimdlenClause(Expr *Len, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc) {
    return getSema().ActOnOpenMPSimdlenClause(Len, StartLoc, LParenLoc, EndLoc);
  }

  OMPClause *RebuildOMPSizesClause(ArrayRef<Expr *> Sizes,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc) {
    return getSema().ActOnOpenMPSizesClause(Sizes, StartLoc, LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'full' clause.
  OMPClause *RebuildOMPFullClause(SourceLocation StartLoc,
                                  SourceLocation EndLoc) {
    return getSema().ActOnOpenMPFullClause(StartLoc, EndLoc);
  }

  /// Build a new OpenMP 'partial' clause.
  OMPClause *RebuildOMPPartialClause(Expr *Factor, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc) {
    return getSema().ActOnOpenMPPartialClause(Factor, StartLoc, LParenLoc,
                                              EndLoc);
  }

  /// Build a new OpenMP 'allocator' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPAllocatorClause(Expr *A, SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc) {
    return getSema().ActOnOpenMPAllocatorClause(A, StartLoc, LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'collapse' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPCollapseClause(Expr *Num, SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation EndLoc) {
    return getSema().ActOnOpenMPCollapseClause(Num, StartLoc, LParenLoc,
                                               EndLoc);
  }

  /// Build a new OpenMP 'default' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPDefaultClause(DefaultKind Kind, SourceLocation KindKwLoc,
                                     SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc) {
    return getSema().ActOnOpenMPDefaultClause(Kind, KindKwLoc,
                                              StartLoc, LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'proc_bind' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPProcBindClause(ProcBindKind Kind,
                                      SourceLocation KindKwLoc,
                                      SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation EndLoc) {
    return getSema().ActOnOpenMPProcBindClause(Kind, KindKwLoc,
                                               StartLoc, LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'schedule' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPScheduleClause(
      OpenMPScheduleClauseModifier M1, OpenMPScheduleClauseModifier M2,
      OpenMPScheduleClauseKind Kind, Expr *ChunkSize, SourceLocation StartLoc,
      SourceLocation LParenLoc, SourceLocation M1Loc, SourceLocation M2Loc,
      SourceLocation KindLoc, SourceLocation CommaLoc, SourceLocation EndLoc) {
    return getSema().ActOnOpenMPScheduleClause(
        M1, M2, Kind, ChunkSize, StartLoc, LParenLoc, M1Loc, M2Loc, KindLoc,
        CommaLoc, EndLoc);
  }

  /// Build a new OpenMP 'ordered' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPOrderedClause(SourceLocation StartLoc,
                                     SourceLocation EndLoc,
                                     SourceLocation LParenLoc, Expr *Num) {
    return getSema().ActOnOpenMPOrderedClause(StartLoc, EndLoc, LParenLoc, Num);
  }

  /// Build a new OpenMP 'private' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPPrivateClause(ArrayRef<Expr *> VarList,
                                     SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc) {
    return getSema().ActOnOpenMPPrivateClause(VarList, StartLoc, LParenLoc,
                                              EndLoc);
  }

  /// Build a new OpenMP 'firstprivate' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPFirstprivateClause(ArrayRef<Expr *> VarList,
                                          SourceLocation StartLoc,
                                          SourceLocation LParenLoc,
                                          SourceLocation EndLoc) {
    return getSema().ActOnOpenMPFirstprivateClause(VarList, StartLoc, LParenLoc,
                                                   EndLoc);
  }

  /// Build a new OpenMP 'lastprivate' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPLastprivateClause(ArrayRef<Expr *> VarList,
                                         OpenMPLastprivateModifier LPKind,
                                         SourceLocation LPKindLoc,
                                         SourceLocation ColonLoc,
                                         SourceLocation StartLoc,
                                         SourceLocation LParenLoc,
                                         SourceLocation EndLoc) {
    return getSema().ActOnOpenMPLastprivateClause(
        VarList, LPKind, LPKindLoc, ColonLoc, StartLoc, LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'shared' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPSharedClause(ArrayRef<Expr *> VarList,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc) {
    return getSema().ActOnOpenMPSharedClause(VarList, StartLoc, LParenLoc,
                                             EndLoc);
  }

  /// Build a new OpenMP 'reduction' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPReductionClause(
      ArrayRef<Expr *> VarList, OpenMPReductionClauseModifier Modifier,
      SourceLocation StartLoc, SourceLocation LParenLoc,
      SourceLocation ModifierLoc, SourceLocation ColonLoc,
      SourceLocation EndLoc, CXXScopeSpec &ReductionIdScopeSpec,
      const DeclarationNameInfo &ReductionId,
      ArrayRef<Expr *> UnresolvedReductions) {
    return getSema().ActOnOpenMPReductionClause(
        VarList, Modifier, StartLoc, LParenLoc, ModifierLoc, ColonLoc, EndLoc,
        ReductionIdScopeSpec, ReductionId, UnresolvedReductions);
  }

  /// Build a new OpenMP 'task_reduction' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPTaskReductionClause(
      ArrayRef<Expr *> VarList, SourceLocation StartLoc,
      SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
      CXXScopeSpec &ReductionIdScopeSpec,
      const DeclarationNameInfo &ReductionId,
      ArrayRef<Expr *> UnresolvedReductions) {
    return getSema().ActOnOpenMPTaskReductionClause(
        VarList, StartLoc, LParenLoc, ColonLoc, EndLoc, ReductionIdScopeSpec,
        ReductionId, UnresolvedReductions);
  }

  /// Build a new OpenMP 'in_reduction' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *
  RebuildOMPInReductionClause(ArrayRef<Expr *> VarList, SourceLocation StartLoc,
                              SourceLocation LParenLoc, SourceLocation ColonLoc,
                              SourceLocation EndLoc,
                              CXXScopeSpec &ReductionIdScopeSpec,
                              const DeclarationNameInfo &ReductionId,
                              ArrayRef<Expr *> UnresolvedReductions) {
    return getSema().ActOnOpenMPInReductionClause(
        VarList, StartLoc, LParenLoc, ColonLoc, EndLoc, ReductionIdScopeSpec,
        ReductionId, UnresolvedReductions);
  }

  /// Build a new OpenMP 'linear' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPLinearClause(ArrayRef<Expr *> VarList, Expr *Step,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    OpenMPLinearClauseKind Modifier,
                                    SourceLocation ModifierLoc,
                                    SourceLocation ColonLoc,
                                    SourceLocation EndLoc) {
    return getSema().ActOnOpenMPLinearClause(VarList, Step, StartLoc, LParenLoc,
                                             Modifier, ModifierLoc, ColonLoc,
                                             EndLoc);
  }

  /// Build a new OpenMP 'aligned' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPAlignedClause(ArrayRef<Expr *> VarList, Expr *Alignment,
                                     SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation ColonLoc,
                                     SourceLocation EndLoc) {
    return getSema().ActOnOpenMPAlignedClause(VarList, Alignment, StartLoc,
                                              LParenLoc, ColonLoc, EndLoc);
  }

  /// Build a new OpenMP 'copyin' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPCopyinClause(ArrayRef<Expr *> VarList,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc) {
    return getSema().ActOnOpenMPCopyinClause(VarList, StartLoc, LParenLoc,
                                             EndLoc);
  }

  /// Build a new OpenMP 'copyprivate' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPCopyprivateClause(ArrayRef<Expr *> VarList,
                                         SourceLocation StartLoc,
                                         SourceLocation LParenLoc,
                                         SourceLocation EndLoc) {
    return getSema().ActOnOpenMPCopyprivateClause(VarList, StartLoc, LParenLoc,
                                                  EndLoc);
  }

  /// Build a new OpenMP 'flush' pseudo clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPFlushClause(ArrayRef<Expr *> VarList,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc) {
    return getSema().ActOnOpenMPFlushClause(VarList, StartLoc, LParenLoc,
                                            EndLoc);
  }

  /// Build a new OpenMP 'depobj' pseudo clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPDepobjClause(Expr *Depobj, SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc) {
    return getSema().ActOnOpenMPDepobjClause(Depobj, StartLoc, LParenLoc,
                                             EndLoc);
  }

  /// Build a new OpenMP 'depend' pseudo clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *
  RebuildOMPDependClause(Expr *DepModifier, OpenMPDependClauseKind DepKind,
                         SourceLocation DepLoc, SourceLocation ColonLoc,
                         ArrayRef<Expr *> VarList, SourceLocation StartLoc,
                         SourceLocation LParenLoc, SourceLocation EndLoc) {
    return getSema().ActOnOpenMPDependClause(DepModifier, DepKind, DepLoc,
                                             ColonLoc, VarList, StartLoc,
                                             LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'device' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPDeviceClause(OpenMPDeviceClauseModifier Modifier,
                                    Expr *Device, SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation ModifierLoc,
                                    SourceLocation EndLoc) {
    return getSema().ActOnOpenMPDeviceClause(Modifier, Device, StartLoc,
                                             LParenLoc, ModifierLoc, EndLoc);
  }

  /// Build a new OpenMP 'map' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPMapClause(
      ArrayRef<OpenMPMapModifierKind> MapTypeModifiers,
      ArrayRef<SourceLocation> MapTypeModifiersLoc,
      CXXScopeSpec MapperIdScopeSpec, DeclarationNameInfo MapperId,
      OpenMPMapClauseKind MapType, bool IsMapTypeImplicit,
      SourceLocation MapLoc, SourceLocation ColonLoc, ArrayRef<Expr *> VarList,
      const OMPVarListLocTy &Locs, ArrayRef<Expr *> UnresolvedMappers) {
    return getSema().ActOnOpenMPMapClause(
        MapTypeModifiers, MapTypeModifiersLoc, MapperIdScopeSpec, MapperId,
        MapType, IsMapTypeImplicit, MapLoc, ColonLoc, VarList, Locs,
        /*NoDiagnose=*/false, UnresolvedMappers);
  }

  /// Build a new OpenMP 'allocate' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPAllocateClause(Expr *Allocate, ArrayRef<Expr *> VarList,
                                      SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation ColonLoc,
                                      SourceLocation EndLoc) {
    return getSema().ActOnOpenMPAllocateClause(Allocate, VarList, StartLoc,
                                               LParenLoc, ColonLoc, EndLoc);
  }

  /// Build a new OpenMP 'num_teams' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPNumTeamsClause(Expr *NumTeams, SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation EndLoc) {
    return getSema().ActOnOpenMPNumTeamsClause(NumTeams, StartLoc, LParenLoc,
                                               EndLoc);
  }

  /// Build a new OpenMP 'thread_limit' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPThreadLimitClause(Expr *ThreadLimit,
                                         SourceLocation StartLoc,
                                         SourceLocation LParenLoc,
                                         SourceLocation EndLoc) {
    return getSema().ActOnOpenMPThreadLimitClause(ThreadLimit, StartLoc,
                                                  LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'priority' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPPriorityClause(Expr *Priority, SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation EndLoc) {
    return getSema().ActOnOpenMPPriorityClause(Priority, StartLoc, LParenLoc,
                                               EndLoc);
  }

  /// Build a new OpenMP 'grainsize' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPGrainsizeClause(Expr *Grainsize, SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc) {
    return getSema().ActOnOpenMPGrainsizeClause(Grainsize, StartLoc, LParenLoc,
                                                EndLoc);
  }

  /// Build a new OpenMP 'num_tasks' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPNumTasksClause(Expr *NumTasks, SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation EndLoc) {
    return getSema().ActOnOpenMPNumTasksClause(NumTasks, StartLoc, LParenLoc,
                                               EndLoc);
  }

  /// Build a new OpenMP 'hint' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPHintClause(Expr *Hint, SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc) {
    return getSema().ActOnOpenMPHintClause(Hint, StartLoc, LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'detach' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPDetachClause(Expr *Evt, SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc) {
    return getSema().ActOnOpenMPDetachClause(Evt, StartLoc, LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'dist_schedule' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *
  RebuildOMPDistScheduleClause(OpenMPDistScheduleClauseKind Kind,
                               Expr *ChunkSize, SourceLocation StartLoc,
                               SourceLocation LParenLoc, SourceLocation KindLoc,
                               SourceLocation CommaLoc, SourceLocation EndLoc) {
    return getSema().ActOnOpenMPDistScheduleClause(
        Kind, ChunkSize, StartLoc, LParenLoc, KindLoc, CommaLoc, EndLoc);
  }

  /// Build a new OpenMP 'to' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *
  RebuildOMPToClause(ArrayRef<OpenMPMotionModifierKind> MotionModifiers,
                     ArrayRef<SourceLocation> MotionModifiersLoc,
                     CXXScopeSpec &MapperIdScopeSpec,
                     DeclarationNameInfo &MapperId, SourceLocation ColonLoc,
                     ArrayRef<Expr *> VarList, const OMPVarListLocTy &Locs,
                     ArrayRef<Expr *> UnresolvedMappers) {
    return getSema().ActOnOpenMPToClause(MotionModifiers, MotionModifiersLoc,
                                         MapperIdScopeSpec, MapperId, ColonLoc,
                                         VarList, Locs, UnresolvedMappers);
  }

  /// Build a new OpenMP 'from' clause.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *
  RebuildOMPFromClause(ArrayRef<OpenMPMotionModifierKind> MotionModifiers,
                       ArrayRef<SourceLocation> MotionModifiersLoc,
                       CXXScopeSpec &MapperIdScopeSpec,
                       DeclarationNameInfo &MapperId, SourceLocation ColonLoc,
                       ArrayRef<Expr *> VarList, const OMPVarListLocTy &Locs,
                       ArrayRef<Expr *> UnresolvedMappers) {
    return getSema().ActOnOpenMPFromClause(
        MotionModifiers, MotionModifiersLoc, MapperIdScopeSpec, MapperId,
        ColonLoc, VarList, Locs, UnresolvedMappers);
  }

  /// Build a new OpenMP 'use_device_ptr' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPUseDevicePtrClause(ArrayRef<Expr *> VarList,
                                          const OMPVarListLocTy &Locs) {
    return getSema().ActOnOpenMPUseDevicePtrClause(VarList, Locs);
  }

  /// Build a new OpenMP 'use_device_addr' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPUseDeviceAddrClause(ArrayRef<Expr *> VarList,
                                           const OMPVarListLocTy &Locs) {
    return getSema().ActOnOpenMPUseDeviceAddrClause(VarList, Locs);
  }

  /// Build a new OpenMP 'is_device_ptr' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPIsDevicePtrClause(ArrayRef<Expr *> VarList,
                                         const OMPVarListLocTy &Locs) {
    return getSema().ActOnOpenMPIsDevicePtrClause(VarList, Locs);
  }

  /// Build a new OpenMP 'defaultmap' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPDefaultmapClause(OpenMPDefaultmapClauseModifier M,
                                        OpenMPDefaultmapClauseKind Kind,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation MLoc,
                                        SourceLocation KindLoc,
                                        SourceLocation EndLoc) {
    return getSema().ActOnOpenMPDefaultmapClause(M, Kind, StartLoc, LParenLoc,
                                                 MLoc, KindLoc, EndLoc);
  }

  /// Build a new OpenMP 'nontemporal' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPNontemporalClause(ArrayRef<Expr *> VarList,
                                         SourceLocation StartLoc,
                                         SourceLocation LParenLoc,
                                         SourceLocation EndLoc) {
    return getSema().ActOnOpenMPNontemporalClause(VarList, StartLoc, LParenLoc,
                                                  EndLoc);
  }

  /// Build a new OpenMP 'inclusive' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPInclusiveClause(ArrayRef<Expr *> VarList,
                                       SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc) {
    return getSema().ActOnOpenMPInclusiveClause(VarList, StartLoc, LParenLoc,
                                                EndLoc);
  }

  /// Build a new OpenMP 'exclusive' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPExclusiveClause(ArrayRef<Expr *> VarList,
                                       SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc) {
    return getSema().ActOnOpenMPExclusiveClause(VarList, StartLoc, LParenLoc,
                                                EndLoc);
  }

  /// Build a new OpenMP 'uses_allocators' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPUsesAllocatorsClause(
      ArrayRef<Sema::UsesAllocatorsData> Data, SourceLocation StartLoc,
      SourceLocation LParenLoc, SourceLocation EndLoc) {
    return getSema().ActOnOpenMPUsesAllocatorClause(StartLoc, LParenLoc, EndLoc,
                                                    Data);
  }

  /// Build a new OpenMP 'affinity' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPAffinityClause(SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation ColonLoc,
                                      SourceLocation EndLoc, Expr *Modifier,
                                      ArrayRef<Expr *> Locators) {
    return getSema().ActOnOpenMPAffinityClause(StartLoc, LParenLoc, ColonLoc,
                                               EndLoc, Modifier, Locators);
  }

  /// Build a new OpenMP 'order' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPOrderClause(OpenMPOrderClauseKind Kind,
                                   SourceLocation KindKwLoc,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc) {
    return getSema().ActOnOpenMPOrderClause(Kind, KindKwLoc, StartLoc,
                                            LParenLoc, EndLoc);
  }

  /// Build a new OpenMP 'init' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPInitClause(Expr *InteropVar, ArrayRef<Expr *> PrefExprs,
                                  bool IsTarget, bool IsTargetSync,
                                  SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation VarLoc,
                                  SourceLocation EndLoc) {
    return getSema().ActOnOpenMPInitClause(InteropVar, PrefExprs, IsTarget,
                                           IsTargetSync, StartLoc, LParenLoc,
                                           VarLoc, EndLoc);
  }

  /// Build a new OpenMP 'use' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPUseClause(Expr *InteropVar, SourceLocation StartLoc,
                                 SourceLocation LParenLoc,
                                 SourceLocation VarLoc, SourceLocation EndLoc) {
    return getSema().ActOnOpenMPUseClause(InteropVar, StartLoc, LParenLoc,
                                          VarLoc, EndLoc);
  }

  /// Build a new OpenMP 'destroy' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPDestroyClause(Expr *InteropVar, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation VarLoc,
                                     SourceLocation EndLoc) {
    return getSema().ActOnOpenMPDestroyClause(InteropVar, StartLoc, LParenLoc,
                                              VarLoc, EndLoc);
  }

  /// Build a new OpenMP 'novariants' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPNovariantsClause(Expr *Condition,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc) {
    return getSema().ActOnOpenMPNovariantsClause(Condition, StartLoc, LParenLoc,
                                                 EndLoc);
  }

  /// Build a new OpenMP 'nocontext' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPNocontextClause(Expr *Condition, SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc) {
    return getSema().ActOnOpenMPNocontextClause(Condition, StartLoc, LParenLoc,
                                                EndLoc);
  }

  /// Build a new OpenMP 'filter' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPFilterClause(Expr *ThreadID, SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc) {
    return getSema().ActOnOpenMPFilterClause(ThreadID, StartLoc, LParenLoc,
                                             EndLoc);
  }

  /// Build a new OpenMP 'bind' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPBindClause(OpenMPBindClauseKind Kind,
                                  SourceLocation KindLoc,
                                  SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc) {
    return getSema().ActOnOpenMPBindClause(Kind, KindLoc, StartLoc, LParenLoc,
                                           EndLoc);
  }

  /// Build a new OpenMP 'align' clause.
  ///
  /// By default, performs semantic analysis to build the new OpenMP clause.
  /// Subclasses may override this routine to provide different behavior.
  OMPClause *RebuildOMPAlignClause(Expr *A, SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc) {
    return getSema().ActOnOpenMPAlignClause(A, StartLoc, LParenLoc, EndLoc);
  }

  /// Rebuild the operand to an Objective-C \@synchronized statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildObjCAtSynchronizedOperand(SourceLocation atLoc,
                                              Expr *object) {
    return getSema().ActOnObjCAtSynchronizedOperand(atLoc, object);
  }

  /// Build a new Objective-C \@synchronized statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildObjCAtSynchronizedStmt(SourceLocation AtLoc,
                                           Expr *Object, Stmt *Body) {
    return getSema().ActOnObjCAtSynchronizedStmt(AtLoc, Object, Body);
  }

  /// Build a new Objective-C \@autoreleasepool statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildObjCAutoreleasePoolStmt(SourceLocation AtLoc,
                                            Stmt *Body) {
    return getSema().ActOnObjCAutoreleasePoolStmt(AtLoc, Body);
  }

  /// Build a new Objective-C fast enumeration statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildObjCForCollectionStmt(SourceLocation ForLoc,
                                          Stmt *Element,
                                          Expr *Collection,
                                          SourceLocation RParenLoc,
                                          Stmt *Body) {
    StmtResult ForEachStmt = getSema().ActOnObjCForCollectionStmt(ForLoc,
                                                Element,
                                                Collection,
                                                RParenLoc);
    if (ForEachStmt.isInvalid())
      return StmtError();

    return getSema().FinishObjCForCollectionStmt(ForEachStmt.get(), Body);
  }

  /// Build a new C++ exception declaration.
  ///
  /// By default, performs semantic analysis to build the new decaration.
  /// Subclasses may override this routine to provide different behavior.
  VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl,
                                TypeSourceInfo *Declarator,
                                SourceLocation StartLoc,
                                SourceLocation IdLoc,
                                IdentifierInfo *Id) {
    VarDecl *Var = getSema().BuildExceptionDeclaration(nullptr, Declarator,
                                                       StartLoc, IdLoc, Id);
    if (Var)
      getSema().CurContext->addDecl(Var);
    return Var;
  }

  /// Build a new C++ catch statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildCXXCatchStmt(SourceLocation CatchLoc,
                                 VarDecl *ExceptionDecl,
                                 Stmt *Handler) {
    return Owned(new (getSema().Context) CXXCatchStmt(CatchLoc, ExceptionDecl,
                                                      Handler));
  }

  /// Build a new C++ try statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildCXXTryStmt(SourceLocation TryLoc, Stmt *TryBlock,
                               ArrayRef<Stmt *> Handlers) {
    return getSema().ActOnCXXTryBlock(TryLoc, TryBlock, Handlers);
  }

  /// Build a new C++0x range-based for statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildCXXForRangeStmt(SourceLocation ForLoc,
                                    SourceLocation CoawaitLoc, Stmt *Init,
                                    SourceLocation ColonLoc, Stmt *Range,
                                    Stmt *Begin, Stmt *End, Expr *Cond,
                                    Expr *Inc, Stmt *LoopVar,
                                    SourceLocation RParenLoc) {
    // If we've just learned that the range is actually an Objective-C
    // collection, treat this as an Objective-C fast enumeration loop.
    if (DeclStmt *RangeStmt = dyn_cast<DeclStmt>(Range)) {
      if (RangeStmt->isSingleDecl()) {
        if (VarDecl *RangeVar = dyn_cast<VarDecl>(RangeStmt->getSingleDecl())) {
          if (RangeVar->isInvalidDecl())
            return StmtError();

          Expr *RangeExpr = RangeVar->getInit();
          if (!RangeExpr->isTypeDependent() &&
              RangeExpr->getType()->isObjCObjectPointerType()) {
            // FIXME: Support init-statements in Objective-C++20 ranged for
            // statement.
            if (Init) {
              return SemaRef.Diag(Init->getBeginLoc(),
                                  diag::err_objc_for_range_init_stmt)
                         << Init->getSourceRange();
            }
            return getSema().ActOnObjCForCollectionStmt(ForLoc, LoopVar,
                                                        RangeExpr, RParenLoc);
          }
        }
      }
    }

    return getSema().BuildCXXForRangeStmt(ForLoc, CoawaitLoc, Init, ColonLoc,
                                          Range, Begin, End, Cond, Inc, LoopVar,
                                          RParenLoc, Sema::BFRK_Rebuild);
  }

  /// Build a new C++0x range-based for statement.
  ///
  /// By default, performs semantic analysis to build the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult RebuildMSDependentExistsStmt(SourceLocation KeywordLoc,
                                          bool IsIfExists,
                                          NestedNameSpecifierLoc QualifierLoc,
                                          DeclarationNameInfo NameInfo,
                                          Stmt *Nested) {
    return getSema().BuildMSDependentExistsStmt(KeywordLoc, IsIfExists,
                                                QualifierLoc, NameInfo, Nested);
  }

  /// Attach body to a C++0x range-based for statement.
  ///
  /// By default, performs semantic analysis to finish the new statement.
  /// Subclasses may override this routine to provide different behavior.
  StmtResult FinishCXXForRangeStmt(Stmt *ForRange, Stmt *Body) {
    return getSema().FinishCXXForRangeStmt(ForRange, Body);
  }

  StmtResult RebuildSEHTryStmt(bool IsCXXTry, SourceLocation TryLoc,
                               Stmt *TryBlock, Stmt *Handler) {
    return getSema().ActOnSEHTryBlock(IsCXXTry, TryLoc, TryBlock, Handler);
  }

  StmtResult RebuildSEHExceptStmt(SourceLocation Loc, Expr *FilterExpr,
                                  Stmt *Block) {
    return getSema().ActOnSEHExceptBlock(Loc, FilterExpr, Block);
  }

  StmtResult RebuildSEHFinallyStmt(SourceLocation Loc, Stmt *Block) {
    return SEHFinallyStmt::Create(getSema().getASTContext(), Loc, Block);
  }

  ExprResult RebuildSYCLUniqueStableNameExpr(SourceLocation OpLoc,
                                             SourceLocation LParen,
                                             SourceLocation RParen,
                                             TypeSourceInfo *TSI) {
    return getSema().BuildSYCLUniqueStableNameExpr(OpLoc, LParen, RParen, TSI);
  }

  /// Build a new predefined expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildPredefinedExpr(SourceLocation Loc,
                                   PredefinedExpr::IdentKind IK) {
    return getSema().BuildPredefinedExpr(Loc, IK);
  }

  /// Build a new expression that references a declaration.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildDeclarationNameExpr(const CXXScopeSpec &SS,
                                        LookupResult &R,
                                        bool RequiresADL) {
    return getSema().BuildDeclarationNameExpr(SS, R, RequiresADL);
  }


  /// Build a new expression that references a declaration.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildDeclRefExpr(NestedNameSpecifierLoc QualifierLoc,
                                ValueDecl *VD,
                                const DeclarationNameInfo &NameInfo,
                                NamedDecl *Found,
                                TemplateArgumentListInfo *TemplateArgs) {
    CXXScopeSpec SS;
    SS.Adopt(QualifierLoc);
    return getSema().BuildDeclarationNameExpr(SS, NameInfo, VD, Found,
                                              TemplateArgs);
  }

  /// Build a new expression in parentheses.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildParenExpr(Expr *SubExpr, SourceLocation LParen,
                                    SourceLocation RParen) {
    return getSema().ActOnParenExpr(LParen, RParen, SubExpr);
  }

  /// Build a new pseudo-destructor expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCXXPseudoDestructorExpr(Expr *Base,
                                            SourceLocation OperatorLoc,
                                            bool isArrow,
                                            CXXScopeSpec &SS,
                                            TypeSourceInfo *ScopeType,
                                            SourceLocation CCLoc,
                                            SourceLocation TildeLoc,
                                        PseudoDestructorTypeStorage Destroyed);

  /// Build a new unary operator expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildUnaryOperator(SourceLocation OpLoc,
                                        UnaryOperatorKind Opc,
                                        Expr *SubExpr) {
    return getSema().BuildUnaryOp(/*Scope=*/nullptr, OpLoc, Opc, SubExpr);
  }

  /// Build a new builtin offsetof expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildOffsetOfExpr(SourceLocation OperatorLoc,
                                 TypeSourceInfo *Type,
                                 ArrayRef<Sema::OffsetOfComponent> Components,
                                 SourceLocation RParenLoc) {
    return getSema().BuildBuiltinOffsetOf(OperatorLoc, Type, Components,
                                          RParenLoc);
  }

  /// Build a new sizeof, alignof or vec_step expression with a
  /// type argument.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildUnaryExprOrTypeTrait(TypeSourceInfo *TInfo,
                                         SourceLocation OpLoc,
                                         UnaryExprOrTypeTrait ExprKind,
                                         SourceRange R) {
    return getSema().CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, R);
  }

  /// Build a new sizeof, alignof or vec step expression with an
  /// expression argument.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildUnaryExprOrTypeTrait(Expr *SubExpr, SourceLocation OpLoc,
                                         UnaryExprOrTypeTrait ExprKind,
                                         SourceRange R) {
    ExprResult Result
      = getSema().CreateUnaryExprOrTypeTraitExpr(SubExpr, OpLoc, ExprKind);
    if (Result.isInvalid())
      return ExprError();

    return Result;
  }

  /// Build a new array subscript expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildArraySubscriptExpr(Expr *LHS,
                                             SourceLocation LBracketLoc,
                                             Expr *RHS,
                                             SourceLocation RBracketLoc) {
    return getSema().ActOnArraySubscriptExpr(/*Scope=*/nullptr, LHS,
                                             LBracketLoc, RHS,
                                             RBracketLoc);
  }

  /// Build a new matrix subscript expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildMatrixSubscriptExpr(Expr *Base, Expr *RowIdx,
                                        Expr *ColumnIdx,
                                        SourceLocation RBracketLoc) {
    return getSema().CreateBuiltinMatrixSubscriptExpr(Base, RowIdx, ColumnIdx,
                                                      RBracketLoc);
  }

  /// Build a new array section expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildOMPArraySectionExpr(Expr *Base, SourceLocation LBracketLoc,
                                        Expr *LowerBound,
                                        SourceLocation ColonLocFirst,
                                        SourceLocation ColonLocSecond,
                                        Expr *Length, Expr *Stride,
                                        SourceLocation RBracketLoc) {
    return getSema().ActOnOMPArraySectionExpr(Base, LBracketLoc, LowerBound,
                                              ColonLocFirst, ColonLocSecond,
                                              Length, Stride, RBracketLoc);
  }

  /// Build a new array shaping expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildOMPArrayShapingExpr(Expr *Base, SourceLocation LParenLoc,
                                        SourceLocation RParenLoc,
                                        ArrayRef<Expr *> Dims,
                                        ArrayRef<SourceRange> BracketsRanges) {
    return getSema().ActOnOMPArrayShapingExpr(Base, LParenLoc, RParenLoc, Dims,
                                              BracketsRanges);
  }

  /// Build a new iterator expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildOMPIteratorExpr(
      SourceLocation IteratorKwLoc, SourceLocation LLoc, SourceLocation RLoc,
      ArrayRef<Sema::OMPIteratorData> Data) {
    return getSema().ActOnOMPIteratorExpr(/*Scope=*/nullptr, IteratorKwLoc,
                                          LLoc, RLoc, Data);
  }

  /// Build a new call expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCallExpr(Expr *Callee, SourceLocation LParenLoc,
                                   MultiExprArg Args,
                                   SourceLocation RParenLoc,
                                   Expr *ExecConfig = nullptr) {
    return getSema().ActOnCallExpr(
        /*Scope=*/nullptr, Callee, LParenLoc, Args, RParenLoc, ExecConfig);
  }

  /// Build a new member access expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildMemberExpr(Expr *Base, SourceLocation OpLoc,
                               bool isArrow,
                               NestedNameSpecifierLoc QualifierLoc,
                               SourceLocation TemplateKWLoc,
                               const DeclarationNameInfo &MemberNameInfo,
                               ValueDecl *Member,
                               NamedDecl *FoundDecl,
                        const TemplateArgumentListInfo *ExplicitTemplateArgs,
                               NamedDecl *FirstQualifierInScope) {
    ExprResult BaseResult = getSema().PerformMemberExprBaseConversion(Base,
                                                                      isArrow);
    if (!Member->getDeclName()) {
      // We have a reference to an unnamed field.  This is always the
      // base of an anonymous struct/union member access, i.e. the
      // field is always of record type.
      assert(Member->getType()->isRecordType() &&
             "unnamed member not of record type?");

      BaseResult =
        getSema().PerformObjectMemberConversion(BaseResult.get(),
                                                QualifierLoc.getNestedNameSpecifier(),
                                                FoundDecl, Member);
      if (BaseResult.isInvalid())
        return ExprError();
      Base = BaseResult.get();

      CXXScopeSpec EmptySS;
      return getSema().BuildFieldReferenceExpr(
          Base, isArrow, OpLoc, EmptySS, cast<FieldDecl>(Member),
          DeclAccessPair::make(FoundDecl, FoundDecl->getAccess()), MemberNameInfo);
    }

    CXXScopeSpec SS;
    SS.Adopt(QualifierLoc);

    Base = BaseResult.get();
    QualType BaseType = Base->getType();

    if (isArrow && !BaseType->isPointerType())
      return ExprError();

    // FIXME: this involves duplicating earlier analysis in a lot of
    // cases; we should avoid this when possible.
    LookupResult R(getSema(), MemberNameInfo, Sema::LookupMemberName);
    R.addDecl(FoundDecl);
    R.resolveKind();

    return getSema().BuildMemberReferenceExpr(Base, BaseType, OpLoc, isArrow,
                                              SS, TemplateKWLoc,
                                              FirstQualifierInScope,
                                              R, ExplicitTemplateArgs,
                                              /*S*/nullptr);
  }

  /// Build a new binary operator expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildBinaryOperator(SourceLocation OpLoc,
                                         BinaryOperatorKind Opc,
                                         Expr *LHS, Expr *RHS) {
    return getSema().BuildBinOp(/*Scope=*/nullptr, OpLoc, Opc, LHS, RHS);
  }

  /// Build a new rewritten operator expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCXXRewrittenBinaryOperator(
      SourceLocation OpLoc, BinaryOperatorKind Opcode,
      const UnresolvedSetImpl &UnqualLookups, Expr *LHS, Expr *RHS) {
    return getSema().CreateOverloadedBinOp(OpLoc, Opcode, UnqualLookups, LHS,
                                           RHS, /*RequiresADL*/false);
  }

  /// Build a new conditional operator expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildConditionalOperator(Expr *Cond,
                                        SourceLocation QuestionLoc,
                                        Expr *LHS,
                                        SourceLocation ColonLoc,
                                        Expr *RHS) {
    return getSema().ActOnConditionalOp(QuestionLoc, ColonLoc, Cond,
                                        LHS, RHS);
  }

  /// Build a new C-style cast expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCStyleCastExpr(SourceLocation LParenLoc,
                                         TypeSourceInfo *TInfo,
                                         SourceLocation RParenLoc,
                                         Expr *SubExpr) {
    return getSema().BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc,
                                         SubExpr);
  }

  /// Build a new compound literal expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCompoundLiteralExpr(SourceLocation LParenLoc,
                                              TypeSourceInfo *TInfo,
                                              SourceLocation RParenLoc,
                                              Expr *Init) {
    return getSema().BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc,
                                              Init);
  }

  /// Build a new extended vector element access expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildExtVectorElementExpr(Expr *Base,
                                               SourceLocation OpLoc,
                                               SourceLocation AccessorLoc,
                                               IdentifierInfo &Accessor) {

    CXXScopeSpec SS;
    DeclarationNameInfo NameInfo(&Accessor, AccessorLoc);
    return getSema().BuildMemberReferenceExpr(Base, Base->getType(),
                                              OpLoc, /*IsArrow*/ false,
                                              SS, SourceLocation(),
                                              /*FirstQualifierInScope*/ nullptr,
                                              NameInfo,
                                              /* TemplateArgs */ nullptr,
                                              /*S*/ nullptr);
  }

  /// Build a new initializer list expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildInitList(SourceLocation LBraceLoc,
                             MultiExprArg Inits,
                             SourceLocation RBraceLoc) {
    return SemaRef.BuildInitList(LBraceLoc, Inits, RBraceLoc);
  }

  /// Build a new designated initializer expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildDesignatedInitExpr(Designation &Desig,
                                             MultiExprArg ArrayExprs,
                                             SourceLocation EqualOrColonLoc,
                                             bool GNUSyntax,
                                             Expr *Init) {
    ExprResult Result
      = SemaRef.ActOnDesignatedInitializer(Desig, EqualOrColonLoc, GNUSyntax,
                                           Init);
    if (Result.isInvalid())
      return ExprError();

    return Result;
  }

  /// Build a new value-initialized expression.
  ///
  /// By default, builds the implicit value initialization without performing
  /// any semantic analysis. Subclasses may override this routine to provide
  /// different behavior.
  ExprResult RebuildImplicitValueInitExpr(QualType T) {
    return new (SemaRef.Context) ImplicitValueInitExpr(T);
  }

  /// Build a new \c va_arg expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildVAArgExpr(SourceLocation BuiltinLoc,
                                    Expr *SubExpr, TypeSourceInfo *TInfo,
                                    SourceLocation RParenLoc) {
    return getSema().BuildVAArgExpr(BuiltinLoc,
                                    SubExpr, TInfo,
                                    RParenLoc);
  }

  /// Build a new expression list in parentheses.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildParenListExpr(SourceLocation LParenLoc,
                                  MultiExprArg SubExprs,
                                  SourceLocation RParenLoc) {
    return getSema().ActOnParenListExpr(LParenLoc, RParenLoc, SubExprs);
  }

  /// Build a new address-of-label expression.
  ///
  /// By default, performs semantic analysis, using the name of the label
  /// rather than attempting to map the label statement itself.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildAddrLabelExpr(SourceLocation AmpAmpLoc,
                                  SourceLocation LabelLoc, LabelDecl *Label) {
    return getSema().ActOnAddrLabel(AmpAmpLoc, LabelLoc, Label);
  }

  /// Build a new GNU statement expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildStmtExpr(SourceLocation LParenLoc, Stmt *SubStmt,
                             SourceLocation RParenLoc, unsigned TemplateDepth) {
    return getSema().BuildStmtExpr(LParenLoc, SubStmt, RParenLoc,
                                   TemplateDepth);
  }

  /// Build a new __builtin_choose_expr expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildChooseExpr(SourceLocation BuiltinLoc,
                                     Expr *Cond, Expr *LHS, Expr *RHS,
                                     SourceLocation RParenLoc) {
    return SemaRef.ActOnChooseExpr(BuiltinLoc,
                                   Cond, LHS, RHS,
                                   RParenLoc);
  }

  /// Build a new generic selection expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildGenericSelectionExpr(SourceLocation KeyLoc,
                                         SourceLocation DefaultLoc,
                                         SourceLocation RParenLoc,
                                         Expr *ControllingExpr,
                                         ArrayRef<TypeSourceInfo *> Types,
                                         ArrayRef<Expr *> Exprs) {
    return getSema().CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
                                                ControllingExpr, Types, Exprs);
  }

  /// Build a new overloaded operator call expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// The semantic analysis provides the behavior of template instantiation,
  /// copying with transformations that turn what looks like an overloaded
  /// operator call into a use of a builtin operator, performing
  /// argument-dependent lookup, etc. Subclasses may override this routine to
  /// provide different behavior.
  ExprResult RebuildCXXOperatorCallExpr(OverloadedOperatorKind Op,
                                              SourceLocation OpLoc,
                                              Expr *Callee,
                                              Expr *First,
                                              Expr *Second);

  /// Build a new C++ "named" cast expression, such as static_cast or
  /// reinterpret_cast.
  ///
  /// By default, this routine dispatches to one of the more-specific routines
  /// for a particular named case, e.g., RebuildCXXStaticCastExpr().
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCXXNamedCastExpr(SourceLocation OpLoc,
                                           Stmt::StmtClass Class,
                                           SourceLocation LAngleLoc,
                                           TypeSourceInfo *TInfo,
                                           SourceLocation RAngleLoc,
                                           SourceLocation LParenLoc,
                                           Expr *SubExpr,
                                           SourceLocation RParenLoc) {
    switch (Class) {
    case Stmt::CXXStaticCastExprClass:
      return getDerived().RebuildCXXStaticCastExpr(OpLoc, LAngleLoc, TInfo,
                                                   RAngleLoc, LParenLoc,
                                                   SubExpr, RParenLoc);

    case Stmt::CXXDynamicCastExprClass:
      return getDerived().RebuildCXXDynamicCastExpr(OpLoc, LAngleLoc, TInfo,
                                                    RAngleLoc, LParenLoc,
                                                    SubExpr, RParenLoc);

    case Stmt::CXXReinterpretCastExprClass:
      return getDerived().RebuildCXXReinterpretCastExpr(OpLoc, LAngleLoc, TInfo,
                                                        RAngleLoc, LParenLoc,
                                                        SubExpr,
                                                        RParenLoc);

    case Stmt::CXXConstCastExprClass:
      return getDerived().RebuildCXXConstCastExpr(OpLoc, LAngleLoc, TInfo,
                                                   RAngleLoc, LParenLoc,
                                                   SubExpr, RParenLoc);

    case Stmt::CXXAddrspaceCastExprClass:
      return getDerived().RebuildCXXAddrspaceCastExpr(
          OpLoc, LAngleLoc, TInfo, RAngleLoc, LParenLoc, SubExpr, RParenLoc);

    default:
      llvm_unreachable("Invalid C++ named cast");
    }
  }

  /// Build a new C++ static_cast expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCXXStaticCastExpr(SourceLocation OpLoc,
                                            SourceLocation LAngleLoc,
                                            TypeSourceInfo *TInfo,
                                            SourceLocation RAngleLoc,
                                            SourceLocation LParenLoc,
                                            Expr *SubExpr,
                                            SourceLocation RParenLoc) {
    return getSema().BuildCXXNamedCast(OpLoc, tok::kw_static_cast,
                                       TInfo, SubExpr,
                                       SourceRange(LAngleLoc, RAngleLoc),
                                       SourceRange(LParenLoc, RParenLoc));
  }

  /// Build a new C++ dynamic_cast expression.
  ///
  /// By default, performs semantic analysis to build the new expression.
  /// Subclasses may override this routine to provide different behavior.
  ExprResult RebuildCXXDynamicCastExpr(SourceLocation OpLoc,
                                             SourceLocation LAngleLoc,
                                             TypeSourceInfo *TInfo